A top patch, an energy-storage apparatus, and an electricity-consumption device are provided. The top patch defines a first pole through-hole and a first hole spaced apart from the first pole through-hole in a length direction of the top patch, the first hole includes two side walls arranged opposite to each other in a width direction of the top patch, each of the two side walls is provided with an extension bump, the first hole at one side of the extension bump forms a first explosion-proof valve through-hole, the first hole at the other side of the extension bump forms a second pole through-hole, and an angle at which each of the hole wall of the first pole through-hole, the hole wall of the second pole through-hole, and the hole wall of the first explosion-proof valve through-hole is inclined relative to a connecting surface ranges from 25 degrees to 85 degrees.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority under 35 U.S.C. § 119(a) to Chinese Patent Application No. 202310091038.3, filed Feb. 9, 2023, the entire disclosure of which is incorporated herein by reference.

TECHNICAL FIELD

This disclosure relates to the field of energy-storage technologies, and in particular to a top patch, an energy-storage apparatus, and an electricity-consumption device.

BACKGROUND

With development of clean energy, more and more devices use batteries and other energy-storage apparatuses as main power sources, for example, lithium batteries and lithium iron phosphate energy-storage batteries. Generally, a top patch is arranged on a top cap of a battery with electrodes. In this way, an insulation effect can be achieved to prevent short circuiting between the battery and another circuit, and the top cap of the battery can be protected to prevent the top cap from being directly impacted by an external force.

SUMMARY

In a first aspect, a top patch is provided in the present disclosure. The top patch is configured to be attached to a smooth aluminum sheet of an energy-storage apparatus. The top patch defines a first pole through-hole and a first hole spaced apart from the first pole through-hole in a length direction of the top patch. The first hole includes two side walls arranged opposite to each other in a width direction of the top patch. Each of the two side walls is provided with an extension bump. The first hole at one side of the extension bump forms a first explosion-proof valve through-hole, and the first hole at the other side of the extension bump forms a second pole through-hole. The top patch further includes a connecting surface configured to be connected to the smooth aluminum sheet. Each of a hole wall of the first pole through-hole, a hole wall of the second pole through-hole, and a hole wall of the first explosion-proof valve through-hole is arranged obliquely relative to the connecting surface. An angle at which each of the hole wall of the first pole through-hole, the hole wall of the second pole through-hole, and the hole wall of the first explosion-proof valve through-hole is inclined relative to the connecting surface ranges from 25 degrees to 85 degrees.

In a second aspect, an energy-storage apparatus is provided in the present disclosure. The energy-storage apparatus includes a smooth aluminum sheet and a top patch. The top patch is attached to a top surface of the smooth aluminum sheet. The top patch defines a first pole through-hole and a first hole spaced apart from the first pole through-hole in a length direction of the top patch. The first hole includes two side walls arranged opposite to each other in a width direction of the top patch. Each of the two side walls is provided with an extension bump. The first hole at one side of the extension bump forms a first explosion-proof valve through-hole, and the first hole at the other side of the extension bump forms a second pole through-hole. The top patch further includes a connecting surface configured to be connected to the smooth aluminum sheet. Each of a hole wall of the first pole through-hole, a hole wall of the second pole through-hole, and a hole wall of the first explosion-proof valve through-hole is arranged obliquely relative to the connecting surface. An angle at which each of the hole wall of the first pole through-hole, the hole wall of the second pole through-hole, and the hole wall of the first explosion-proof valve through-hole is inclined relative to the connecting surface ranges from 25 degrees to 85 degrees.

In a third aspect, an electricity-consumption device is provided in the present disclosure. The electricity-consumption device includes an energy-storage apparatus. The energy-storage apparatus includes a smooth aluminum sheet and a top patch, where the top patch is attached to a top surface of the smooth aluminum sheet. The top patch defines a first pole through-hole and a first hole spaced apart from the first pole through-hole in a length direction of the top patch. The first hole includes two side walls arranged opposite to each other in a width direction of the top patch. Each of the two side walls is provided with an extension bump. The first hole at one side of the extension bump forms a first explosion-proof valve through-hole, and the first hole at the other side of the extension bump forms a second pole through-hole. The top patch further includes a connecting surface configured to be connected to the smooth aluminum sheet. Each of a hole wall of the first pole through-hole, a hole wall of the second pole through-hole, and a hole wall of the first explosion-proof valve through-hole is arranged obliquely relative to the connecting surface. An angle at which each of the hole wall of the first pole through-hole, the hole wall of the second pole through-hole, and the hole wall of the first explosion-proof valve through-hole is inclined relative to the connecting surface ranges from 25 degrees to 85 degrees.

DETAILED DESCRIPTION

For ease of understanding, terms involved in embodiments of the present disclosure are first explained.

“Multiple” means two or more than two.

“Connection” may be understood in a broad sense. For example, a connection between A and B may be a direct connection between A and B, or an indirect connection between A and B through an intermediary.

Implementations of the present disclosure are clearly described below with reference to the accompanying drawings.

Currently, a pattern portion required for being mounted with an end cap assembly is generally formed by cutting a sheet for preparing the top patch, and offcuts corresponding to the pattern portion are removed, so that the top patch is adapted to a shape of related functional parts of the end cap assembly. Because the offcuts to be cut in the top patch are not easy to be removed, machining time costs of the top patch increase, and production efficiency of the energy-storage apparatus decreases.

Embodiments of the present disclosure provide a top patch, an energy-storage apparatus, and an electricity-consumption device that are capable of improving production efficiency.

In a first aspect, a top patch is provided in the present disclosure. The top patch is configured to be attached to a smooth aluminum sheet of an energy-storage apparatus. The top patch defines a first pole through-hole and a first hole spaced apart from the first pole through-hole in a length direction of the top patch. The first hole includes two side walls arranged opposite to each other in a width direction of the top patch. Each of the two side walls is provided with an extension bump. The first hole at one side of the extension bump forms a first explosion-proof valve through-hole, and the first hole at the other side of the extension bump forms a second pole through-hole. The top patch further includes a connecting surface configured to be connected to the smooth aluminum sheet. Each of a hole wall of the first pole through-hole, a hole wall of the second pole through-hole, and a hole wall of the first explosion-proof valve through-hole is arranged obliquely relative to the connecting surface. An angle at which each of the hole wall of the first pole through-hole, the hole wall of the second pole through-hole, and the hole wall of the first explosion-proof valve through-hole is inclined relative to the connecting surface ranges from 25 degrees to 85 degrees.

It may be understood that, a positive pole/negative pole of the energy-storage apparatus may be exposed beyond the first pole through-hole, and a negative pole/positive pole of the energy-storage apparatus may be exposed beyond the second pole through-hole, so that the energy-storage apparatus may be electrically connected to another component. An explosion-proof valve of the energy-storage apparatus may be exposed beyond the first explosion-proof valve through-hole, so that when internal pressure of the energy-storage apparatus is too large, the explosion-proof valve can be lifted in a direction of the first explosion-proof valve through-hole, and the internal pressure of the energy-storage apparatus is discharged, thereby avoiding explosion of the energy-storage apparatus.

In addition, the top patch is formed by cutting a sheet. In a cutting process, a cutting tool may obliquely cut a middle part of the sheet to define a through hole with an inclined hole wall. After the sheet is obliquely cut, an edge of offcuts of the middle part of the sheet forms a sharp corner, which is convenient for an operator to separate the offcuts in a middle region of the sheet from the edge and take out the offcuts from the top patch.

Furthermore, when each of the hole wall of the first pole through-hole, the hole wall of the second pole through-hole, and the hole wall of the first explosion-proof valve through-hole is inclined relative to the connecting surface at the angle within the foregoing range, the operator can more conveniently remove offcuts in each hole from the top patch, and a removing effect is better. The top patch is unlikely to be damaged, the offcuts are completely removed, and the offcuts may not be left on an inner edge of the top patch.

Each of the hole wall of the first pole through-hole, the hole wall of the second pole through-hole, and the hole wall of the first explosion-proof valve through-hole is inclined at an angle ranging from 25 degrees to 85 degrees. In this way, each of the hole wall of the first pole through-hole, the hole wall of the second pole through-hole, and the hole wall of the first explosion-proof valve through-hole is prevented from being inclined relative to the connecting surface at an excessively large angle, and causing a width of an oblique cutting trace to be too large and an oblique cutting edge to be likely to leave a top-patch offcuts adhesive. In addition, each of the hole wall of the first pole through-hole, the hole wall of the second pole through-hole, and the hole wall of the first explosion-proof valve through-hole is prevented from being inclined relative to the connecting surface at an excessively small angle. In other words, when each of the hole wall of the first pole through-hole, the hole wall of the second pole through-hole, and the hole wall of the first explosion-proof valve through-hole is inclined relative to the connecting surface at an angle approaching 90 degrees, an obliquely-cut inclined surface may not have an inward flange, which is inconvenient for removing the offcuts. The angle at which each of the hole wall of the first pole through-hole, the hole wall of the second pole through-hole, and the hole wall of the first explosion-proof valve through-hole is inclined relative to the connecting surface is set within a reasonable range, so that the offcuts can form a convex edge, thereby facilitating removing of the offcuts.

In a possible implementation, each of the hole wall of the first pole through-hole, the hole wall of the second pole through-hole, and the hole wall of the first explosion-proof valve through-hole has a flat surface with a fixed slope; or each of the hole wall of the first pole through-hole, the hole wall of the second pole through-hole, and the hole wall of the first explosion-proof valve through-hole has a curved surface with a variable slope.

That the hole wall has a flat surface with a fixed slope means that the hole wall is in a shape of a side surface of a frustum, a hole diameter of the through hole gradually increases or decreases, and a change speed remains unchanged. That the hole wall has a surface with a variable slope means that the hole wall has a curved surface, and the change speed of the hole diameter of the through hole gradually increases or decreases.

In a possible implementation, the first hole forms a connecting through-hole between the two extension bumps. The connecting through-hole is located between the second pole through-hole and the first explosion-proof valve through-hole. The connecting through-hole communicates with the second pole through-hole and the first explosion-proof valve through-hole. A hole wall of the connecting through-hole is obliquely arranged relative to the connecting surface.

It may be understood that, an existing top patch generally defines three through holes, namely, a positive electrode through-hole, a negative electrode through-hole, and an explosion-proof valve through-hole. An area of a connection region between every two of the three through holes is relatively small. A structure of a joint between every two of the three through holes is relatively weak. In a process of removing the offcuts to form the positive electrode through-hole, the negative electrode through-hole, and the explosion-proof valve through-hole, the joint between every two through holes is likely to be broken. In embodiments of the present disclosure, the first hole is defined to communicate the second pole through-hole and the first explosion-proof valve through-hole, so that to-be-removed offcuts in the top patch may be large offcuts, which cannot only keep structural integrity of the top patch, but also effectively prevent a portion with a weak structure from being broken due to a force in the process of removing the offcuts in the top patch, and connection strength of the top patch is better.

In addition, due to the weak structure of the joint between the through holes of the top patch in the related art, deformation is likely to occur in the process of removing the offcuts, being attached to and being mounted with an end cap assembly, and the like, and consequently, the top patch cannot be kept flat, and an inner edge or outer edge of the top patch is likely to be warped. In embodiments of the present disclosure, the first hole is defined to communicate the second pole through-hole and the first explosion-proof valve through-hole, to avoid problems such as warpage of the top patch and a difficulty in a subsequent attachment and mounting process of the top patch due to deformation at a joint of each hole.

In a possible implementation, each of the two extension bumps further has a first curved surface. The hole wall of the connecting through-hole is connected to the hole wall of the second pole through-hole through the first curved surface.

It may be understood that, the hole wall of the connecting through-hole is smoothly connected to the hole wall of the second pole through-hole through the first curved surface, so that the top patch may have a relatively smooth inner edge. On one hand, the smooth inner edge can avoid scratching and wear of a wrapping film, the smooth aluminum sheet, or an electrode caused by a sharp edge when the top patch is assembled with another component of the energy-storage apparatus. On the other hand, the smooth inner edge can also make the top patch have good mounting stability, which is beneficial to avoid warpage of edges of through holes in a middle part of the top patch due to poor coordination with the smooth aluminum sheet during mounting, and an adverse effect on mounting reliability of the top patch.

In a possible implementation, a radius of curvature of the first curved surface ranges from 1 mm to 5 mm.

In a possible implementation, the first hole further includes a second curved surface, and the hole wall of the connecting through-hole is connected to the hole wall of the first explosion-proof valve through-hole through the second curved surface.

It may be understood that, the hole wall of the first explosion-proof valve through-hole of the top patch is smoothly connected to the hole wall of the connecting through-hole through the second curved surface, so that the inner edge of the top patch may not have a relatively sharp angle, thus avoiding accidental injury to operators or scratching the wrapping film and the smooth aluminum sheet due to sharp corners in a process of performing an accurate alignment operation on the top patch and the smooth aluminum sheet, and a coordination connection process between the top patch and the smooth aluminum sheet is simplified.

In a possible implementation, a radius of curvature of the second curved surface ranges from 1 mm to 5 mm.

In a possible implementation, in the width direction of the top patch, a length of each of the two extension bumps protruding relative to one side wall ranges from 0.5 mm to 5.5 mm.

It may be understood that, when an extension length of the extension bump is within the foregoing range, the extension bump may abut against a protrusion of the smooth aluminum sheet when the top patch is connected to the smooth aluminum sheet, to play a limiting role.

In a possible implementation, in the width direction of the top patch, a distance between the hole wall of the second pole through-hole and an outer edge of the top patch ranges from 2 mm to 5 mm.

It may be understood that, when a distance between an edge of the top patch and the second pole through-hole is within the foregoing range, a physical structure of the top patch is relatively stable. When the physical structure of the top patch is less than the foregoing range, the physical structure of the top patch is relatively narrow, and is likely to be broken during actual assembly with the smooth aluminum sheet.

In a possible implementation, in the width direction of the top patch, a ratio of the distance between the hole wall of the second pole through-hole and the outer edge of the top patch to a width of the second pole through-hole ranges from ⅙ to ¼.

It may be understood that, when the ratio of the width of the second pole through-hole to the distance between the second pole through-hole and the edge of the top patch is within the foregoing range, physical structural strength of the top patch meets use requirements, and an area of the second pole through-hole is sufficient to expose the protrusion and other structures of the smooth aluminum sheet.

In a possible implementation, the connecting through-hole is an identification through-hole. An identification on the smooth aluminum sheet is exposed beyond the identification through-hole.

It may be understood that, a part of a surface of the energy-storage apparatus may also be exposed though the connecting through-hole, to set some product identifications. In addition, since the top patch is arranged around the identification, and an identification position is recessed relative to the top patch, the identification position is not likely to be scratched by foreign objects.

In a second aspect, an energy-storage apparatus is provided in the present disclosure. The energy-storage apparatus includes a smooth aluminum sheet and a top patch, where the top patch is attached to a top surface of the smooth aluminum sheet. The top patch defines a first pole through-hole and a first hole spaced apart from the first pole through-hole in a length direction of the top patch. The first hole includes two side walls arranged opposite to each other in a width direction of the top patch. Each of the two side walls is provided with an extension bump. The first hole at one side of the extension bump forms a first explosion-proof valve through-hole, and the first hole at the other side of the extension bump forms a second pole through-hole. The top patch further includes a connecting surface configured to be connected to the smooth aluminum sheet. Each of a hole wall of the first pole through-hole, a hole wall of the second pole through-hole, and a hole wall of the first explosion-proof valve through-hole is arranged obliquely relative to the connecting surface. An angle at which each of the hole wall of the first pole through-hole, the hole wall of the second pole through-hole, and the hole wall of the first explosion-proof valve through-hole is inclined relative to the connecting surface ranges from 25 degrees to 85 degrees.

In a possible implementation, the smooth aluminum sheet includes a smooth aluminum-sheet body and a negative electrode protrusion, where the negative electrode protrusion protrudes from the smooth aluminum-sheet body, and the negative electrode protrusion is exposed beyond the second pole through-hole. In a width direction of the smooth aluminum sheet, a distance between an edge of the negative electrode protrusion and an edge of the smooth aluminum-sheet body is a first distance. The distance between the hole wall of the second pole through-hole and the outer edge of the top patch is a second distance. The second distance is less than the first distance.

It may be understood that, a width of a narrowest portion of the top patch in the width direction of the smooth aluminum sheet is less than a width of the negative electrode protrusion of the smooth aluminum sheet from an outer edge of the smooth aluminum sheet. Therefore, after the top patch is attached to the smooth aluminum sheet, the top patch may not fall off because the outer edge of the top patch protrudes relative to the outer edge of the smooth aluminum sheet.

In a possible implementation, the smooth aluminum-sheet body has a first surface facing the top patch. The energy-storage apparatus further includes a wrapping film. An edge of the wrapping film covers a portion of an edge of the first surface. In the width direction of the smooth aluminum sheet, a width of the wrapping film covering the portion of the first surface is a third distance, and the second distance is greater than the third distance.

It may be understood that, in the width direction of the smooth aluminum sheet, the width of the narrowest portion of the top patch is greater than the width of the wrapping film covering the portion of the first surface of the smooth aluminum sheet. With such arrangement, the top patch can completely cover the edge of the wrapping film on the first surface of the smooth aluminum sheet, so that after the top patch is connected to the smooth aluminum sheet, warpage of a portion of the edge of the wrapping film on the surface of the smooth aluminum sheet can be avoided.

In a third aspect, an electricity-consumption device is provided in the present disclosure. The electricity-consumption device includes an energy-storage apparatus. The energy-storage apparatus includes a smooth aluminum sheet and a top patch, where the top patch is attached to a top surface of the smooth aluminum sheet. The top patch defines a first pole through-hole and a first hole spaced apart from the first pole through-hole in a length direction of the top patch. The first hole includes two side walls arranged opposite to each other in a width direction of the top patch. Each of the two side walls is provided with an extension bump. The first hole at one side of the extension bump forms a first explosion-proof valve through-hole, and the first hole at the other side of the extension bump forms a second pole through-hole. The top patch further includes a connecting surface configured to be connected to the smooth aluminum sheet. Each of a hole wall of the first pole through-hole, a hole wall of the second pole through-hole, and a hole wall of the first explosion-proof valve through-hole is arranged obliquely relative to the connecting surface. An angle at which each of the hole wall of the first pole through-hole, the hole wall of the second pole through-hole, and the hole wall of the first explosion-proof valve through-hole is inclined relative to the connecting surface ranges from 25 degrees to 85 degrees.

Referring toFIG.1,FIG.1is a schematic structural diagram of an electricity-consumption device1000according to an embodiment of the present disclosure. The electricity-consumption device1000includes a power system100and an energy-storage apparatus200. The power system100is electrically connected to the energy-storage apparatus200. The energy-storage apparatus200provides a power source for the power system100.

Descriptions are provided below by using an example in which the electricity-consumption device1000is a vehicle. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, where the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. The vehicle includes a battery, a controller, and a motor. The battery is configured to supply power to the controller and/or the motor as an operating power source and/or a driving power source of the vehicle, for example, the battery is configured for power requirements of the vehicle during startup, navigation, and operation. For example, the battery supplies power to the controller, and the controller controls the battery to supply power to the motor, and the motor receives and uses power of the battery as driving power of the vehicle, to replace or partially replace fuel oil or natural gas to provide driving power for the vehicle.

It may be understood that the energy-storage apparatus200may include but is not limited to a single battery, a battery module, a battery pack, a battery system, or the like. When the energy-storage apparatus200is a single battery, the battery may be a prismatic battery. Descriptions are provided below by using an example in which the energy-storage apparatus200is a prismatic battery, but it may be understood that, the energy-storage apparatus is not limited thereto.

It is to be noted that, the vehicle is only a use scenario of the energy-storage apparatus200provided in the present disclosure. In other scenarios, the energy-storage apparatus200can also be used for another electronic device or mechanical device, and is not limited to the vehicle. The energy-storage apparatus200of the present disclosure may also be used in a non-power system, for example, a lighting tool or charging equipment. The use scenario of the energy-storage apparatus200is not specifically limited in the present disclosure.

Referring toFIG.2,FIG.2is a schematic structural diagram of the energy-storage apparatus200shown inFIG.1. For ease of description, a length direction of the energy-storage apparatus200shown inFIG.2is defined as an X-axis direction (hereinafter referred to as direction X), a width direction is defined as a Y-axis direction (hereinafter referred to as direction Y), and a height direction is defined as a Z-axis direction (hereinafter referred to as direction Z).

The energy-storage apparatus200includes an electrode assembly (not shown inFIG.2), a housing210, a smooth aluminum sheet230, and a top patch240. One end of the housing210defines an opening, and the housing210has an accommodating space. The electrode assembly is mounted in the accommodating space of the housing210. The smooth aluminum sheet230is connected to the opening of the housing210, and cooperates with the housing210to encapsulate the electrode assembly. For example, the housing210is a metal housing such as an aluminum housing. The housing210may also be made of other materials. The cell includes a positive electrode sheet, a negative electrode sheet, and a separator located between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet, the separator, and the negative electrode sheet are stacked sequentially and wound to form the cell.

Referring toFIG.3,FIG.3is a schematic structural diagram of fitting of the smooth aluminum sheet230and the top patch240shown inFIG.2. The energy-storage apparatus200further includes a positive pole (not shown inFIG.3), a negative pole (not shown inFIG.3), the smooth aluminum sheet230, and the top patch240.

The positive pole and the negative pole are arranged opposite to each other in direction X, and both the positive pole and the negative pole are electrically connected to the electrode assembly. Specifically, the positive pole is electrically connected with the positive electrode sheet in the electrode assembly to achieve the electrical connection between the positive pole and the electrode assembly, and the positive pole protrudes relative to the electrode assembly in a direction away from the electrode assembly. The negative pole is electrically connected to the negative electrode sheet in the electrode assembly to achieve the electrical connection between the negative pole and the electrode assembly, and the negative pole protrudes relative to the electrode assembly in the direction away from the electrode assembly. The positive pole and the negative pole may be used as electrode poles of the energy-storage apparatus200, and a current in the electrode assembly flows to the positive pole, then flows to an external electricity-consumption device through the positive pole, and flows to the electrode assembly through the negative pole, thus realizing current circulation.

Referring toFIG.3andFIG.4,FIG.4is a schematic structural diagram of the smooth aluminum sheet230shown inFIG.3at an angle. The smooth aluminum sheet230is connected to the opening of the housing210. For example, the smooth aluminum sheet230may be welded to the housing210to isolate the interior of the energy-storage apparatus200and exterior of the energy-storage apparatus200.

The smooth aluminum sheet230includes a smooth aluminum-sheet body231, a positive electrode protrusion232, a negative electrode protrusion233, a second explosion-proof valve through-hole234, and a liquid-injection hole235.

An outer contour of the smooth aluminum-sheet body231is rectangular in shape. The smooth aluminum-sheet body231includes four second outer vertex-corners2311that are at an outer edge of the smooth aluminum sheet230and that are sequentially arranged, and the four second outer vertex-corners2311are four corners of an outer edge of the smooth aluminum-sheet body231.

In a possible implementation, at least one second outer vertex-corner2311of the four second outer vertex-corners2311may be a rounded corner. Descriptions are provided below by using an example in which the four second outer vertex-corners2311are all rounded corners, but it may be understood that, the present disclosure is not limited thereto. It may be understood that, the four second outer vertex-corners2311of the smooth aluminum-sheet body231are all configured as rounded corners, so that the smooth aluminum-sheet body231may have a relatively smooth outer edge. The smooth outer edge can prevent the smooth aluminum sheet230from scratching and wearing another component (such as a wrapping film250) or being pierced by another component due to a sharp edge when assembled with another component (such as the top patch240) in the energy-storage apparatus200. The smooth outer edge can also make the smooth aluminum sheet230have good mounting stability, which is beneficial to avoid warpage around the smooth aluminum sheet230due to contact with another component in the energy-storage apparatus200during installation, and an adverse effect on mounting reliability of the smooth aluminum sheet230.

For example, a corner radius of the second outer vertex-corner2311ranges from 2.0 mm to 3.5 mm (including endpoint values of 2.0 mm and 3.5 mm). It is to be understood that, if a corner of the second outer vertex-corner is set too large, it may result in a situation in which it is difficult to fit with the housing210during assembly. If the corner of the second outer vertex-corner is set too small, mounting of the top patch240may be adversely affected during subsequent assembly with the top patch240. The corner radius of the second outer vertex-corner2311is set within this range, so that when the smooth aluminum sheet230meets an assembly standard, warpage around the top patch240that is caused by touching a sharp corner in a subsequent process and further causes the top patch240to fall can be avoided, and the reliability is excellent.

Still referring toFIG.4, in embodiments of the present disclosure, the smooth aluminum-sheet body231has a first surface2312and a second surface2313that are opposite to each other. The first surface2312is a surface of the smooth aluminum-sheet body231facing the top patch240, and the second surface2313is a surface in the smooth aluminum-sheet body231facing the housing210. The smooth aluminum-sheet body231includes a first end2314and a second end2315. The second end2315and the first end2314are arranged opposite to each other in direction X.

Referring toFIG.5,FIG.5is a schematic structural diagram of the smooth aluminum sheet230shown inFIG.3at another angle. The smooth aluminum-sheet body231defines a first cavity2316and a second cavity2317. The first cavity2316is defined at the first end2314, the first cavity2316is recessed from the second surface2313toward the first surface2312, and the first cavity2316is configured for accommodating another component (such as a lower plastic component) in the energy-storage apparatus200. The second cavity2317is defined at the second end2315, the second cavity2317is recessed from the second surface2313toward the first surface2312, and the second cavity2317is configured for accommodating another component (such as lower plastic component) in the energy-storage apparatus200.

Referring toFIG.4andFIG.6,FIG.6is a schematic structural diagram of the smooth aluminum sheet230shown inFIG.3at yet another angle. The positive electrode protrusion232is arranged at the first end2314of the smooth aluminum-sheet body231, and the positive electrode protrusion232protrudes relative to the first surface2312of the smooth aluminum-sheet body231. The positive electrode protrusion232protrudes relative to the smooth aluminum-sheet body231, so that a good reminding effect can be achieved, and when assembling the energy-storage apparatus200, an operator can align each component of the smooth aluminum sheet230to the top patch240without paying too much attention, which improves assembly efficiency of the energy-storage apparatus200and assembly accuracy of each component in the energy-storage apparatus200. For example, an outer diameter of the positive electrode protrusion232gradually decreases in a direction from the first surface2312of the smooth aluminum-sheet body231to the top patch240.

The positive electrode protrusion232defines a positive electrode through-hole2320. The positive electrode through-hole2320extends through the positive electrode protrusion232in direction Z. The positive electrode through-hole2320is communicated with the first cavity2316. The positive electrode through-hole2320is configured for the positive pole to pass through.

Referring toFIG.4,FIG.5,FIG.6, andFIG.7,FIG.7is a schematic cross-sectional view of plane A-A of the smooth aluminum sheet230shown inFIG.6. The positive electrode protrusion232further has a first top-surface2321, a first bottom-surface2322opposite to the first top-surface2321, and a first peripheral-side-surface2323.

The first top-surface2321is a surface of the positive electrode protrusion232away from the first surface2312. The first top-surface2321may be rectangular. Four vertex corners of the first top-surface2321are rounded corners.

The first bottom-surface2322is a surface of the positive electrode protrusion232facing the housing210, the first bottom-surface2322is connected to an opening of the first cavity2316on a side of the first surface2312, and the first bottom-surface2322closes the opening. The first bottom-surface2322is flush with the first surface2312of the smooth aluminum-sheet body231. The first bottom-surface2322may be rectangular. Four vertex corners of the first bottom-surface2322are rounded corners.

Still referring toFIG.4andFIG.6, the first peripheral-side-surface2323connects the first surface2312to the first top-surface2321. The first peripheral-side-surface2323may include four side surfaces, and two adjacent side surfaces are connected by using a curved surface transition. In other words, a vertex corner of an outer periphery of the positive electrode protrusion is a rounded corner. Four outer corners of the positive electrode protrusion232are configured as a curved surface transition, to prevent the smooth aluminum sheet230from scratching an operator or scratching another component (such as the wrapping film250covering the housing210) due to a sharp edge when assembled with another component of the energy-storage apparatus200. Moreover, a curved surface structure can also play a guiding role in a subsequent mounting process of the top patch240, so that the top patch240can be more easily aligned with the smooth aluminum sheet230.

For example, a radian of the curved surface ranges from 2.5 mm to 3.5 mm (including endpoint values of 2.5 mm and 3.5 mm).

Specifically, the four side surfaces of the first peripheral-side-surface2323may include a first side surface2324, a second side surface2325, a third side surface2326, and a fourth side surface2327. The first side surface2324and the second side surface2325are arranged opposite to each other in direction X. The third side surface2326and the fourth side surface2327are arranged opposite to each other in direction Y. The first side surface2324, the third side surface2326, the second side surface2325, and the fourth side surface2327are sequentially connected to form the first peripheral-side-surface2323of the positive electrode protrusion232. Since four vertex corners of the first top-surface2321and four vertex corners of the first bottom-surface2322are all rounded corners, the first side surface2324is smoothly connected to the third side surface2326by using a curved surface, the third side surface2326is smoothly connected to the second side surface2325by using a curved surface, the second side surface2325is smoothly connected to the fourth side surface2327by using a curved surface, and the fourth side surface2327is smoothly connected to the first side surface2324by using a curved surface.

Still referring toFIG.4andFIG.6, the negative electrode protrusion233is arranged at the second end2315of the smooth aluminum-sheet body231, and the negative electrode protrusion233protrudes relative to the first surface2312of the smooth aluminum-sheet body231. The negative electrode protrusion233protrudes relative to the smooth aluminum-sheet body231, so that a good reminding effect can be achieved, and when assembling the energy-storage apparatus200, an operator can align each component of the smooth aluminum sheet230to the top patch240without paying too much attention, which improves assembly efficiency of the energy-storage apparatus200and assembly accuracy of each component in the energy-storage apparatus200. For example, an outer diameter of the negative electrode protrusion233gradually decreases in the direction from the first surface2312of the smooth aluminum-sheet body231to the top patch240.

The negative electrode protrusion233defines a negative electrode through-hole2330. The negative electrode through-hole2330extends through the negative electrode protrusion233in direction Z. The negative electrode through-hole2330is communicated with the second cavity2317. The negative electrode through-hole2330is configured for the negative pole to pass through.

Referring toFIG.4,FIG.6, andFIG.8,FIG.8is a schematic cross-sectional view of plane B-B of the smooth aluminum sheet230shown inFIG.6. The negative electrode protrusion233further has a second top-surface2331, a second bottom-surface2332opposite to the second top-surface2331, and a second peripheral-side-surface2333.

The second top-surface2331is a surface of the negative electrode protrusion233away from the first surface2312. The second top-surface2331may be rectangular. Four vertex corners of the second top-surface2331are rounded corners.

The second bottom-surface2332is a surface of the negative electrode protrusion233facing the housing210, the second bottom-surface2332is connected to an opening of the second cavity2317on the side of the first surface2312, and the second bottom-surface2332closes the opening. The second bottom-surface2332is flush with the first surface2312of the smooth aluminum-sheet body231. The second bottom-surface2332may be rectangular. Four vertex corners of the second bottom-surface2332are rounded corners.

Referring toFIG.4andFIG.6again, the second peripheral-side-surface2333connects the first surface2312to the second top-surface2331. The second peripheral-side-surface2333may include four side surfaces, and two adjacent side surfaces are connected by using a curved surface transition. In other words, a vertex corner of an outer peripheral edge of the negative electrode protrusion233is a rounded corner. Four outer corners of the negative electrode protrusion233are configured as a curved surface transition, to prevent the smooth aluminum sheet230from scratching an operator or scratching another component (such as the wrapping film250covering the housing210) due to a sharp edge when assembled with another component of the energy-storage apparatus200. Moreover, a curved surface structure can also play a guiding role in a subsequent mounting process of the top patch240, so that the top patch240can be more easily aligned with the smooth aluminum sheet230.

For example, a radian of the curved surface ranges from 2.5 mm to 3.5 mm (including endpoint values of 2.5 mm and 3.5 mm).

Specifically, the four side surfaces of the second peripheral-side-surface2333may include a fifth side surface2334, a sixth side surface2335, a seventh side surface2336, and an eighth side surface2337. The fifth side surface2334and the sixth side surface2335are arranged opposite to each other in direction X. The seventh side surface2336and the eighth side surface2337are arranged opposite to each other in direction Y. The fifth side surface2334, the seventh side surface2336, the sixth side surface2335, and the eighth side surface2337are sequentially connected form the second peripheral-side-surface2333of the negative electrode protrusion233. Since four vertex corners of the second top-surface2331and four vertex corners of the second bottom-surface2332are all rounded corners, the fifth side surface2334is smoothly connected to the seventh side surface2336by using a curved surface, the seventh side surface2336is smoothly connected to the sixth side surface2335by using a curved surface, the sixth side surface2335is smoothly connected to the eighth side surface2337by using a curved surface, and the eighth side surface2337is smoothly connected to the fifth side surface2334by using a curved surface.

The second explosion-proof valve through-hole234is between the positive electrode protrusion232and the negative electrode protrusion233. The second explosion-proof valve through-hole234, the positive electrode protrusion232, and the negative electrode protrusion233are arranged at intervals. The second explosion-proof valve through-hole234extends through the smooth aluminum-sheet body231of the smooth aluminum sheet230in direction Z. The second explosion-proof valve through-hole234is configured to connect an explosion-proof valve of the energy-storage apparatus200.

Referring toFIG.5andFIG.9,FIG.9is a schematic cross-sectional view of plane C-C of the smooth aluminum sheet230shown inFIG.6. The liquid-injection hole235is located between the positive electrode protrusion232and the second explosion-proof valve through-hole234, and the liquid-injection hole235, the positive electrode protrusion232, and the second explosion-proof valve through-hole234are arranged at intervals.

The liquid-injection hole235may be a blind hole. As shown inFIG.9, the liquid-injection hole235is in an open state when the energy-storage apparatus200is not assembled, and the liquid-injection hole235is a through hole2351. The through hole2351extends through the smooth aluminum-sheet body231in direction Z. As shown inFIG.6, the through hole2351is connected to a sealing member2352after the energy-storage apparatus200is assembled. The sealing member2352seals the through hole2351to form the liquid-injection hole235that is recessed relative to the first surface2312. The liquid-injection hole235has a liquid-injection-hole top-surface2353and a liquid-injection-hole bottom-surface2354opposite to the liquid-injection-hole top-surface2353in an opposite direction of direction Z. The liquid-injection-hole top-surface2353is recessed relative to the first surface2312, and the liquid-injection-hole bottom-surface2354may protrude relative to the second surface2313.

Since the liquid-injection hole235is recessed relative to the first surface2312, and a recessed direction of the liquid-injection hole235is opposite to a protruding direction of the positive electrode protrusion232and a protruding direction of the negative electrode protrusion233. Therefore, after liquid injection into the through hole2351is completed and the sealing member2352is welded to the through hole2351to form the liquid-injection hole235, the liquid-injection hole235may not protrude relative to the first surface2312of the smooth aluminum-sheet body231. In this arrangement, the smooth aluminum-sheet body231has good flatness, so that when the top patch240is subsequently mounted, the top patch240may be flush with and attached to the first surface2312of the smooth aluminum-sheet body231, the top patch240will not be unable to be flush with and attached to the first surface2312of the smooth aluminum-sheet body231due to the protrusion on the first surface2312, and the top patch240is unlikely to be fallen off from the smooth aluminum sheet230.

For example, the liquid-injection hole235is recessed relative to the first surface2312at a distance ranging from 0.7 mm to 1.0 mm (including endpoint values of 0.7 mm and 1.0 mm).

Referring toFIG.10,FIG.10is a schematic top view of fitting of the smooth aluminum sheet230shown inFIG.6and a wrapping film250. The energy-storage apparatus200may further include a wrapping film250. The wrapping film250may be attached to an outer surface of the housing210, thereby protecting the housing210of the energy-storage apparatus200and internal components of the housing210. The wrapping film250covers the housing, and an edge of the wrapping film250covers an edge of a portion of the smooth aluminum sheet230.

In the width direction (that is, direction Y) of the smooth aluminum sheet230, a distance between the negative electrode protrusion233and the outer edge of the smooth aluminum-sheet body231may be a first distance L1, and a width of the wrapping film250covering a portion of the first surface2312of the smooth aluminum-sheet body231may be a third distance L3.

It is to be noted that, the distance between the negative electrode protrusion233and the outer edge of the smooth aluminum sheet230may be the same as or different from a distance between the positive electrode protrusion232and the outer edge of the smooth aluminum sheet230.

Referring toFIG.3,FIG.11, andFIG.12,FIG.11is a schematic structural diagram of the top patch240shown inFIG.3, andFIG.12is a schematic top view of the top patch240shown inFIG.11.

The top patch240is attached to a top end of the smooth aluminum sheet230. The top patch240has a connecting surface2400. The connecting surface2400of the top patch240is connected to the first surface2312of the smooth aluminum sheet230. The top patch240may be an insulator. On one hand, the top patch240may be disposed to achieve an insulation effect, to prevent the energy-storage apparatus200from being short-circuited with another circuit. On the other hand, the smooth aluminum sheet230of the energy-storage apparatus200can be protected to prevent the smooth aluminum sheet230from being directly impacted by an external force and being damaged.

The top patch240is rectangular. A shape of the top patch240may be the same as a shape of the smooth aluminum sheet230. The top patch240includes four first outer vertex-corners241that are located at the outer edge of the top patch240and that are sequentially arranged, and the four first outer vertex-corners241are four corners of an outer edge of the top patch240.

In a possible implementation, at least one first outer vertex-corner241in the four first outer vertex-corners241is a rounded corner. Descriptions are provided below by using an example in which the four first outer vertex-corners241are all rounded corners, but it may be understood that, the present disclosure is not limited thereto. It may be understood that, the four first outer vertex-corners241of the top patch240are all configured as rounded corners, so that the top patch240may have a relatively smooth outer edge. On one hand, the smooth outer edge can prevent the top patch240from scratching another component, being pierced by another component or scratching operators due to a sharp edge when assembled with another component (such as the wrapping film250covering the housing210) of the energy-storage apparatus200. On the other hand, the smooth outer edge can also make the top patch240have good mounting stability, which is beneficial to avoid warpage around the top patch240due to contact with another component in the energy-storage apparatus200during installation, and an adverse effect on mounting reliability of the top patch240. For example, a corner radius of the first outer vertex-corner241may range from 2.0 mm to 3.5 mm (including endpoint values of 2.0 mm and 3.5 mm).

In this implementation, the corner radius of the first outer vertex-corner241of the top patch240may be greater than the corner radius of the second outer vertex-corner2311of the smooth aluminum sheet230. In addition, a straight edge of an outer contour of the top patch240may be flush with a straight edge of an outer contour of the smooth aluminum sheet230in direction Y. Alternatively, the straight edge of the outer contour of the top patch240may be recessed relative to the outer contour of the smooth aluminum sheet230in direction Y. In other words, in direction Y, two straight edges of the top patch240may be between two straight edges of the aluminum sheet230.

It may be understood that, since the top patch240and the smooth aluminum sheet230are both rectangular, a center angle corresponding to the first outer vertex-corner241of the top patch240and a center angle corresponding to the second outer vertex-corner2311of the smooth aluminum sheet230are both 90 degrees. When the corner radius of the first outer vertex-corner241is greater than the corner radius of the second outer vertex-corner2311, a vertex corner of the top patch240is inwardly contracted relative to the smooth aluminum sheet230, and the top patch240is completely located on a surface of the smooth aluminum sheet230. In other words, the top patch240may not exceed relative to the edge of the smooth aluminum sheet230, thereby preventing the top patch240from being removed from the smooth aluminum sheet230or preventing the vertex corner of the top patch240from warping relative to the smooth aluminum sheet230.

Still referring toFIG.11andFIG.12, the top patch240includes a third end242and a fourth end243. The fourth end243and the third end242are arranged opposite to each other in direction X. The top patch240further defines a first pole through-hole244and a first hole2404. The first hole2404includes two side walls2407arranged opposite to each other in direction Y. The two side walls2407are respectively a first wall2405and a second wall2406. Each of two side walls2407is provided with an extension bump2408, and extension bumps2408of the two side walls2407are arranged opposite to each other. The first hole2404at one side of the extension bump2408forms a first explosion-proof valve through-hole246, and the first hole2404at the other side of the extension bump2408forms a second pole through-hole245. A connecting through-hole247is defined between the two extension bumps2408. The extension bump2408further has a first curved surface248and a second curved surface249. One of the positive electrode protrusion232or the negative electrode protrusion233of the smooth aluminum sheet230may be exposed beyond the first pole through-hole244, and the other of the positive electrode protrusion232or the negative electrode protrusion233of the smooth aluminum sheet230may be exposed beyond the second pole through-hole245.

For example, in a width direction of the top patch240, a length (W) of the extension bumps2408protruding relative to the side wall2407ranges from 0.5 mm to 5.5 mm (including endpoint values of 0.5 mm and 5.5 mm). A distance between an edge of the top patch240and the second pole through-hole245ranges from 2 mm to 5 mm (including end point values of 2 mm and 5 mm). In addition, a ratio of a width of the second pole through-hole245to a distance L2between a hole wall2451of the second pole through-hole245and the outer edge of the top patch240may range from ⅙ to ¼ (including end point values of ⅙ and ¼).

In a possible implementation, the positive electrode protrusion232of the smooth aluminum sheet230is exposed beyond the first pole through-hole244, and the negative electrode protrusion233of the smooth aluminum sheet230is exposed beyond the second pole through-hole245. The first curved surface248connects the hole wall2451of the second pole through-hole245to a hole wall2470of the connecting through-hole247. The second curved surface249connects a hole wall2460of the first explosion-proof valve through-hole246to the hole wall2470of the connecting through-hole247. Descriptions are provided below by using this implementation as an example, but it may be understood that, the present disclosure is not limited thereto.

The first pole through-hole244is defined at the third end242of the top patch240. The first pole through-hole244is rectangular, and four vertex corners of the first pole through-hole244are rounded corners. A shape of the first pole through-hole244may be the same as a shape of the first bottom-surface2322of the positive electrode protrusion232, and a corner of the first pole through-hole244may be greater than or equal to a corner of the first bottom-surface2322of the positive electrode protrusion232, so that the first pole through-hole244can be smoothly sheathed on a peripheral side of the positive electrode protrusion232, and the positive electrode protrusion232of the smooth aluminum sheet230is exposed beyond the first pole through-hole244. The first pole through-hole244is configured to accommodate the positive electrode protrusion232. When the top patch240is attached to the smooth aluminum sheet230, the positive electrode protrusion232of the smooth aluminum sheet230exceeds relative to the top patch240.

In a possible implementation, there may be a certain gap between a hole wall2441of the first pole through-hole244and the peripheral side of the positive electrode protrusion232, so that the first pole through-hole244can be smoothly sheathed on the peripheral side of the positive electrode protrusion232even if there is a certain machining error.

Referring toFIG.12andFIG.13,FIG.13is a possible schematic cross-sectional view of the top patch240shown inFIG.12on plane D-D. The hole wall2441of the first pole through-hole244is obliquely arranged relative to the connecting surface2400. In other words, a hole diameter of the first pole through-hole244gradually changes in a direction from the connecting surface2400and away from the connecting surface2400. For example, as shown inFIG.13, the hole diameter of the first pole through-hole244gradually increases in the direction from the connecting surface2400and away from the connecting surface2400.

It may be understood that, the first pole through-hole244is defined after cutting a sheet of the top patch240. In the cutting process, a cutting tool may obliquely cut a corresponding position of the first pole through-hole244of the sheet to define the first pole through-hole244with the hole wall2441of the first pole through-hole244arranged obliquely. After the sheet is obliquely cut, edges of offcuts inside the first pole through-hole244forms a sharp corner, which facilitates an operator to separate the offcuts from the edge and take out the offcuts from top patch240, thereby saving machining time costs of the top patch240. For example, the cutting of the top patch240in the present disclosure may be in a form of laser cutting or physical blanking.

An angle α1at which the hole wall2441of the first pole through-hole244is inclined relative to the connecting surface2400ranges from 25 degrees to 85 degrees. On one hand, the hole wall2441of the first pole through-hole244is prevented from being inclined relative to the connecting surface2400at an excessively large angle α1, and causing a width of an oblique cutting trace to be too large and an oblique cutting edge to be likely to leave a top-patch offcuts adhesive. On the other hand, when the angle α1at which the hole wall2441of the first pole through-hole244is inclined relative to the connecting surface2400is too small, that is, when the angle α1at which the hole wall2441of the first pole through-hole244is inclined relative to the connecting surface2400approaches 90 degrees, an obliquely-cut inclined surface may not have an inward flange, which is inconvenient for removing the offcuts. The angle α1at which the hole wall2441of the first pole through-hole244is inclined relative to the connecting surface2400is set within a reasonable range, so that the offcuts can form a convex edge, thereby facilitating removing of the offcuts. It is to be noted that, the angle α1at which the hole wall2441of the first pole through-hole244is inclined relative to the connecting surface2400is a largest angle among angles between a tangent of any point of the first pole through-hole244and the connecting surface2400.

It may be understood that, when the angle α1is within the foregoing range, the operator can more conveniently remove the offcuts in the first pole through-hole244from the top patch240, and the removing effect is better, the top patch240is unlikely to be damaged, the offcuts are completely removed, and the offcuts may not be left on an inner edge of the top patch240.

In a possible implementation, referring toFIG.13again, the hole wall2441of the first pole through-hole244may have a flat surface with a fixed slope. That the hole wall2441of the first pole through-hole244has a flat surface with a fixed slope means that the hole wall2441of the first pole through-hole244is in a shape of a side surface of a frustum, a hole diameter of the first pole through-hole244gradually increases or decreases, and a change speed remains unchanged.

It may be understood that, when the hole wall2441of the first pole through-hole244has a flat surface with a fixed slope, there is no need to adjust an angle between a machining tool and the connecting surface2400during machining, the machining tool is less required, and machining accuracy is easy to meet requirements, thereby saving machining costs of the top patch240and improving a yield of the top patch240.

In another possible implementation, the hole wall2441of the first pole through-hole244may be a surface with a variable slope. That the hole wall2441of the first pole through-hole244has a surface with a variable slope means that the hole wall has a curved surface, and the change speed of the hole diameter of the first pole through-hole244gradually increases or decreases.

Specifically, referring toFIG.14,FIG.14is another possible schematic cross-sectional view of the top patch240shown inFIG.12on plane D-D. The change speed of the hole diameter of the first pole through-hole244gradually increases, that is, the hole wall2441of the first pole through-hole244protrudes toward a center line of the first pole through-hole244. Alternatively, referring toFIG.15,FIG.15is yet another possible schematic cross-sectional view of the top patch240shown inFIG.12on plane D-D. The change speed of the hole diameter of the first pole through-hole244gradually decreases, that is, the hole wall2441of the first pole through-hole244is recessed away from a center line of the first pole through-hole244.

It may be understood that, that the hole wall2441of the first pole through-hole244is a surface with a variable slope may be adapted for more use scenarios, and this is not strictly limited in embodiments of the present disclosure.

The second pole through-hole245is defined at the fourth end243of the top patch240. The second pole through-hole245is rectangular, and four vertex corners of the second pole through-hole245are rounded corners. A shape of the second pole through-hole245may be the same as a shape of the second bottom-surface2332of the negative electrode protrusion233, and a corner of the second pole through-hole245may be greater than or equal to a corner of the second bottom-surface2332of the negative electrode protrusion233, so that the second pole through-hole245can be smoothly sheathed on a peripheral side of the negative electrode protrusion233, and the negative electrode protrusion233of the smooth aluminum sheet230is exposed beyond the second pole through-hole245. The second pole through-hole245is configured to accommodate the negative electrode protrusion233. When the top patch240is attached to the smooth aluminum sheet230, the negative electrode protrusion233of the smooth aluminum sheet230exceeds relative to the top patch240.

In a possible implementation, there may be a certain gap between a hole wall2451of the second pole through-hole245and the peripheral side of the negative electrode protrusion233, so that the second pole through-hole245can be smoothly sheathed on the peripheral side of the negative electrode protrusion233even if there is a certain machining error.

It may be understood that, since the positive electrode protrusion232and the negative electrode protrusion233are protruded relative to the first surface2312, the first pole through-hole244and the second pole through-hole245may be mounted in alignment with the positive electrode protrusion232and the negative electrode protrusion233in a process of mounting the top patch240. The first peripheral-side-surface2323of the positive electrode protrusion232and the second peripheral-side-surface2333of the negative electrode protrusion233may guide the mounting process of the top patch240. In addition, since vertex corners of the positive electrode protrusion232and the negative electrode protrusion233are both rounded corners, during mounting, the smooth aluminum sheet230does not have a sharp structure and may not scratch an operator or another component of the energy-storage apparatus200.

Referring toFIG.12andFIG.16,FIG.16is a possible schematic cross-sectional view of the top patch240shown inFIG.12on plane E-E. The hole wall2451of the second pole through-hole245is obliquely arranged relative to the connecting surface2400. In other words, a diameter of the second pole through-hole245gradually changes in a direction from the connecting surface2400and away from the connecting surface2400. For example, as shown inFIG.16, the hole diameter of the second pole through-hole245gradually increases in the direction from the connecting surface2400and away from the connecting surface2400.

It may be understood that, the second pole through-hole245is defined after cutting a sheet of the top patch240. In the cutting process, a cutting tool may obliquely cut a corresponding position of the second pole through-hole245of the sheet, so that the hole wall2451of the second pole through-hole245is obliquely arranged. After the sheet is obliquely cut, edges of offcuts inside the second pole through-hole245define a sharp corner, which facilitates an operator to separate the offcuts from the edge and take out the offcuts from top patch240, thereby saving machining time costs of the top patch240. For example, the cutting of the top patch240in the present disclosure may be in a form of laser cutting or physical blanking.

An angle α2at which the hole wall2451of the second pole through-hole245is inclined relative to the connecting surface2400ranges from 25 degrees to 85 degrees. On one hand, the hole wall2451of the second pole through-hole245is prevented from being inclined relative to the connecting surface2400at an excessively large angle α2, and causing a width of an oblique cutting trace to be too large and an oblique cutting edge to be likely to leave a top-patch offcuts adhesive. On the other hand, when the angle α2at which the hole wall2451of the second pole through-hole245is inclined relative to the connecting surface2400is too small, that is, when the angle α2at which the hole wall2451of the second pole through-hole245is inclined relative to the connecting surface2400approaches 90 degrees, an obliquely-cut inclined surface may not have an inward flange, which is inconvenient for removing the offcuts. The angle α2at which the hole wall2451of the second pole through-hole245is inclined relative to the connecting surface2400is set within a reasonable range, so that the offcuts can form a convex edge, thereby facilitating removing of the offcuts. It is to be noted that, the angle α2at which the hole wall2451of the second pole through-hole245is inclined relative to the connecting surface2400is a largest angle among angles between a tangent of any point of the second pole through-hole245and the connecting surface2400.

It may be understood that, when the angle α2is within the foregoing range, the operator can more conveniently remove the offcuts in the second pole through-hole245from the top patch, and the removing effect is better, the top patch240is unlikely to be damaged, the offcuts are completely removed, and the offcuts may not be left on an inner edge of the top patch240.

In a possible implementation, referring toFIG.16, the hole wall2451of the second pole through-hole245may have a flat surface with a fixed slope. That the hole wall2451of the second pole through-hole245has a flat surface with a fixed slope means that the hole wall2451of the second pole through-hole245is in a shape of a side surface of a frustum, a hole diameter of the second pole through-hole245gradually increases or decreases, and a change speed remains unchanged.

It may be understood that, when the hole wall2451of the second pole through-hole245has a flat surface with a fixed slope, there is no need to adjust a cutting angle during machining, the machining tool is less required, and machining accuracy is easy to meet requirements, thereby saving machining costs and improving a yield of the top patch240.

In another possible implementation, the hole wall2451of the second pole through-hole245may be a surface with a variable slope. That the hole wall2451of the second pole through-hole245has a surface with a variable slope means that the hole wall has a curved surface, and the change speed of the hole diameter of the second pole through-hole245gradually increases or decreases.

Specifically, referring toFIG.17,FIG.17is another possible schematic cross-sectional view of the top patch240shown inFIG.12on plane E-E. The change speed of the hole diameter of the second pole through-hole245gradually increases, that is, the hole wall2451of the second pole through-hole245protrudes toward a center line of the second pole through-hole245. Alternatively, referring toFIG.18,FIG.18is yet another possible schematic cross-sectional view of the top patch240shown inFIG.12on plane E-E. The change speed of the hole diameter of the second pole through-hole245gradually decreases, that is, the hole wall2451of the second pole through-hole245is recessed away from a center line of the second pole through-hole245.

It may be understood that, that the hole wall2451of the second pole through-hole245is a surface with a variable slope may be adapted for more use scenarios, and this is not strictly limited in embodiments of the present disclosure.

Referring toFIG.11andFIG.12again, the first explosion-proof valve through-hole246is between the first pole through-hole244and the second pole through-hole245. In addition, the first explosion-proof valve through-hole246, the first pole through-hole244, and the second pole through-hole245are arranged at intervals. A shape of the first explosion-proof valve through-hole246may be the same as a shape of the second explosion-proof valve through-hole234of the smooth aluminum sheet230, and the first explosion-proof valve through-hole246and the second explosion-proof valve through-hole234are defined corresponding to each other and communicate with each other.

The first explosion-proof valve through-hole246extends through the top patch240in direction Z. Specifically, the first explosion-proof valve through-hole246includes a first side wall2461and a second side wall2462arranged opposite to each other in direction X, and a third side wall2463and a fourth side wall2464arranged opposite to each other in direction Y. Each of the first side wall2461and the second side wall2462may have a curved surface. The third side wall2463and the fourth side wall2464each may have a flat surface.

It may be understood that, referring toFIG.2again, in actual use, the smooth aluminum sheet230may include an explosion-proof valve2300, and the second explosion-proof valve through-hole234of the smooth aluminum sheet230may be connected to the explosion-proof valve2300in a sealed manner. The explosion-proof valve2300may be exposed beyond the first explosion-proof valve through-hole246. When internal pressure of the energy-storage apparatus200increases due to abnormality of the energy-storage apparatus200, the internal pressure of the energy-storage apparatus200can lift the explosion-proof valve2300to complete pressure relief and avoid explosion of the energy-storage apparatus200.

Referring toFIG.12andFIG.19,FIG.19is a schematic cross-sectional view of the top patch240shown inFIG.12on plane F-F. The hole wall2460of the first explosion-proof valve through-hole246is obliquely arranged relative to the connecting surface2400. In other words, a diameter of the first explosion-proof valve through-hole246gradually changes in a direction from the connecting surface2400and away from the connecting surface2400. For example, as shown inFIG.19, the hole diameter of the first explosion-proof valve through-hole246gradually increases in the direction from the connecting surface2400and away from the connecting surface2400.

It may be understood that, the first explosion-proof valve through-hole246is defined after cutting a sheet of the top patch240. In the cutting process, a cutting tool may obliquely cut a corresponding position of the first explosion-proof valve through-hole246of the sheet, so that the hole wall2460of the first explosion-proof valve through-hole246is obliquely arranged. After the sheet is obliquely cut, edges of offcuts inside the first explosion-proof valve through-hole246forms a sharp corner, which facilitates an operator to separate the offcuts from the edge and take out the offcuts from top patch240, thereby saving machining time costs of the top patch240. For example, the cutting of the top patch240in the present disclosure may be in a form of laser cutting or physical blanking.

An angle α3at which the hole wall2460of the first explosion-proof valve through-hole246is inclined relative to the connecting surface2400ranges from 25 degrees to 85 degrees. It is to be noted that, the angle α3at which the hole wall2460of the first explosion-proof valve through-hole246is inclined relative to the connecting surface2400is a largest angle among angles between a tangent of any point of the first explosion-proof valve through-hole246and the connecting surface2400.

It may be understood that, when the angle α3is within the foregoing range, the operator can more conveniently remove the offcuts in the first explosion-proof valve through-hole246from the top patch, and the removing effect is better, such that the top patch240is unlikely to be damaged, the offcuts are completely removed, and the offcuts may not be left on an inner edge of the top patch240.

Specifically, each of the first side wall2461, the second side wall2462, the third side wall2463, and the fourth side wall2464of the first explosion-proof valve through-hole246may be obliquely arranged relative to the connecting surface2400. The angle α3between each of the first side wall2461, the second side wall2462, the third side wall2463, and the fourth side wall2464and the connecting surface2400ranges from 25 degrees to 85 degrees. On one hand, it is avoided that the angle α3between each of the first side wall2461, the second side wall2462, the third side wall2463, and the fourth side wall2464and the connecting surface2400is too large, a width of an oblique cutting trace is too large, and an oblique cutting edge to be likely to leave a top-patch offcuts adhesive. On the other hand, it is avoided that the angle α3between each of the first side wall2461, the second side wall2462, the third side wall2463, and the fourth side wall2464and the connecting surface2400is too small, that is, when the angle α3between each of the first side wall2461, the second side wall2462, the third side wall2463and the fourth side wall2464and the connecting surface2400approaches 90 degrees, an obliquely-cut inclined surface may not have an inward flange, which is inconvenient for removing the offcuts. The angle α3between each of the first side wall2461, the second side wall2462, the third side wall2463, and the fourth side wall2464and the connecting surface2400is set within a reasonable range, so that the offcuts can form a convex edge, thereby facilitating removing of the offcuts.

In a possible implementation, referring toFIG.19again, the hole wall2460of the first explosion-proof valve through-hole246may have a flat surface with a fixed slope. That the hole wall2460of the first explosion-proof valve through-hole246has a flat surface with a fixed slope means that the hole wall2460of the first explosion-proof valve through-hole246is in a shape of a side surface of a frustum, a hole diameter of the first explosion-proof valve through-hole246gradually increases or decreases, and a change speed remains unchanged.

It may be understood that, when the hole wall2460of the first explosion-proof valve through-hole246has a flat surface with a fixed slope, there is no need to adjust a cutting angle during machining, the machining tool is less required, and machining accuracy is easy to meet requirements, thereby saving machining costs and improving a yield of the top patch240.

Specifically, the first side wall2461, the second side wall2462, the third side wall2463, and the fourth side wall2464each may have a flat surface. The first side wall2461, the second side wall2462, the third side wall2463, and the fourth side wall2464each are neither protruded nor recessed relative to a center line of the first explosion-proof valve through-hole246.

In another possible implementation, the hole wall2460of the first explosion-proof valve through-hole246may be a surface with a variable slope. That the hole wall2460of the first explosion-proof valve through-hole246has a surface with a variable slope means that the hole wall has a curved surface, and the change speed of the hole diameter of the first explosion-proof valve through-hole246gradually increases or decreases.

For example, referring toFIG.20,FIG.20is another possible schematic cross-sectional view of the top patch240shown inFIG.12on plane F-F. The change speed of the hole diameter of the first explosion-proof valve through-hole246gradually decreases, that is, the hole wall2460of the first explosion-proof valve through-hole246protrudes away from a center line of the first explosion-proof valve through-hole246. Specifically, the first side wall2461, the second side wall2462, the third side wall2463, and the fourth side wall2464each may be a surface protruding toward the center line of the first explosion-proof valve through-hole246.

Alternatively, referring toFIG.21,FIG.21is yet another possible schematic cross-sectional view of the top patch240shown inFIG.12on plane F-F. The change speed of the hole diameter of the first explosion-proof valve through-hole246gradually decreases, that is, the hole wall2460of the first explosion-proof valve through-hole246is recessed away from a center line of the first explosion-proof valve through-hole246. Specifically, the first side wall2461, the second side wall2462, the third side wall2463, and the fourth side wall2464each may be a surface recessed toward the center line of the first explosion-proof valve through-hole246.

It may be understood that, that the hole wall2460of the first explosion-proof valve through-hole246is a surface with a variable slope may be adapted for more use scenarios, and this is not strictly limited in embodiments of the present disclosure.

Referring toFIG.11andFIG.12, the connecting through-hole247may communicate the second pole through-hole245with the first explosion-proof valve through-hole246. In direction Y, a length of the connecting through-hole247may be less than each of a length of the second pole through-hole245in direction Y and a length of the first explosion-proof valve through-hole246in direction Y. In this way, on the basis of satisfying that the connecting through-hole247communicates the second pole through-hole245with the first explosion-proof valve through-hole246, a structural area around the connecting through-hole247is increased as much as possible, so that the connecting through-hole247of the top patch240can effectively avoid an influence of structural strength due to an excessively thin structure of the top patch240while satisfying operating performance (such as exposing an identification2310of the smooth aluminum sheet230described below). In other embodiments, in direction Y, the length of the connecting through-hole247may be greater than each of the length of the second pole through-hole245in direction Y and the length of the first explosion-proof valve through-hole246in direction Y. Alternatively, in direction Y, the length of the connecting through-hole247, the length of the second pole through-hole245, and the length of the first explosion-proof valve through-hole246may be the same.

It may be understood that, an existing top patch generally defines three through holes, namely, a positive electrode through-hole, a negative electrode through-hole, and an explosion-proof valve through-hole, an area of a connection region between every two of the three holes is relatively small, and a structure of a joint is relatively weak. In a process of removing the offcuts to define the positive electrode through-hole, the negative electrode through-hole, and the explosion-proof valve through-hole, the joint between every two holes is likely to be broken. In embodiments of the present disclosure, the first hole2404is defined to communicate the second pole through-hole245with the first explosion-proof valve through-hole246, so that to-be-removed offcuts in the top patch240may be large offcuts, which can not only keep structural integrity of the top patch240, but also effectively prevent a portion with a weak structure from being broken due to a force in the process of removing the offcuts in the top patch240, and connection strength of the top patch is better.

In addition, due to the weak structure of the joint between the through holes of the top patch in the related art, deformation is likely to occur in the process of removing the offcuts, mounting with an end cap assembly, and the like, and consequently, the top patch cannot be kept flat, and an inner edge or outer edge of the top patch is likely to be warped. In embodiments of the present disclosure, the first hole2404is defined to communicate the second pole through-hole245with the first explosion-proof valve through-hole246, to avoid problems such as warpage of the top patch240and a difficulty in a subsequent mounting process of the top patch240due to deformation at a joint of each hole.

Furthermore, arrangement of the connecting through-hole247can reduce a volume of the top patch240occupied by configuring this portion as a physical structure, thereby saving a material of the top patch240. Since a weight of the top patch240is reduced, a weight of the whole energy-storage apparatus200is also reduced. In addition, since the connecting through-hole247communicates the second pole through-hole245with the first explosion-proof valve through-hole246, only two pieces of offcuts (offcuts of the first pole through-hole244and offcuts of a whole for connecting the second pole through-hole245, the connecting through-hole247, and the first explosion-proof valve through-hole246) are present in the top patch240during actual preparation. Therefore, when the top patch240is mounted, a step of removing internal residual materials is relatively simple, which not only improves a molding yield of the top patch240, but also saves production time costs.

Referring toFIG.12andFIG.22,FIG.22is a schematic cross-sectional view of the top patch240shown inFIG.12on plane G-G. The hole wall2470of the connecting through-hole247is obliquely arranged relative to the connecting surface2400. In other words, a diameter of the connecting through-hole247gradually changes in a direction from the connecting surface2400and away from the connecting surface2400. For example, as shown inFIG.22, the hole diameter of the connecting through-hole247gradually increases in the direction from the connecting surface2400and away from the connecting surface2400.

It may be understood that, the second pole through-hole245, the connecting through-hole247, and the first explosion-proof valve through-hole246form a communicated elongated hole. The elongated hole is defined after cutting the sheet of the top patch240. In the cutting process, the cutting tool can obliquely cut a corresponding position of the sheet to form the elongated hole with a hole wall arranged obliquely. After the sheet is obliquely cut, edges of offcuts inside the elongated hole forms a sharp corner, which facilitates an operator to separate the offcuts from the edge and take out the offcuts from the top patch240, thereby saving machining time costs of the top patch240.

An angle α4at which the hole wall2470of the connecting through-hole247is inclined relative to the connecting surface2400ranges from 25 degrees to 85 degrees. It is to be noted that, the angle α4at which the hole wall2470of the connecting through-hole247is inclined relative to the connecting surface2400is a largest angle among angles between a tangent of any point of the connecting through-hole247and the connecting surface2400. A surface of the hole wall2470of the connecting through-hole247may have a flat surface with a fixed slope. Alternatively, the surface of the hole wall2470of the connecting through-hole247may be a surface with a variable slope.

It may be understood that, when the angle α4is within the foregoing range, the operator can more conveniently remove the offcuts in the connecting through-hole247from the top patch, and the removing effect is better, the top patch240is unlikely to be damaged, the offcuts are completely removed, and the offcuts may not be left on an inner edge of the top patch240.

Specifically, the connecting through-hole247includes a fifth side wall2471and a sixth side wall2472arranged opposite to each other in direction Y. As shown inFIG.22, both the fifth side wall2471and the sixth side wall2472may be arranged obliquely relative to the connecting surface2400. The angle α4between the connecting surface2400and each of the fifth side wall2471and the sixth side wall2472ranges from 25 degrees to 85 degrees. On one hand, it is avoided that the angle α4between the connecting surface2400and each of the fifth side wall2471and the sixth side wall2472is too large, a width of an oblique cutting trace is too large, and an oblique cutting edge to be likely to leave a top-patch offcuts adhesive. On the other hand, it is avoided that the angle α4between the connecting surface2400and each of the fifth side wall2471and the sixth side wall2472is too small, that is, when the angle α4between the connecting surface2400and each of the fifth side wall2471and the sixth side wall2472approaches 90 degrees, an obliquely-cut inclined surface may not have an inward flange, which is inconvenient for removing the offcuts. The angle α4between the connecting surface2400and each of the fifth side wall2471and the sixth side wall2472is set within a reasonable range, so that the offcuts can form a convex edge, thereby facilitating removing of the offcuts.

In a possible implementation, referring toFIG.22, the hole wall2470of the connecting through-hole247may have a flat surface with a fixed slope. That the hole wall2470of the connecting through-hole247has a flat surface with a fixed slope means that the hole wall2470of the connecting through-hole247is in a shape of a side surface of a frustum, a hole diameter of the connecting through-hole247gradually increases or decreases, and a change speed remains unchanged. Specifically, the fifth side wall2471and the sixth side wall2472each may have a flat surface.

It may be understood that, when the hole wall2470of the connecting through-hole247has a flat surface with a fixed slope, there is no need to adjust a cutting angle during machining, the machining tool is less required, and machining accuracy is easy to meet requirements, thereby saving machining costs and improving a yield of the top patch240.

In another possible implementation, the hole wall2470of the connecting through-hole247may be a surface with a variable slope. That the hole wall2470of the connecting through-hole247is has surface with a variable slope means that the hole wall has a curved surface, and the change speed of the hole diameter of the connecting through-hole247gradually increases or decreases.

For example, referring toFIG.17,FIG.17is another possible schematic cross-sectional view of the top patch240shown inFIG.12on plane E-E. The change speed of the hole diameter of the connecting through-hole247gradually increases, that is, the hole wall2470of the connecting through-hole247protrudes toward a center line of the connecting through-hole247. Specifically, the fifth side wall2471and the sixth side wall2472may be surfaces protruding toward the center line of the first explosion-proof valve through-hole246.

Alternatively, referring toFIG.18,FIG.18is yet another possible schematic cross-sectional view of the top patch240shown inFIG.12on plane E-E. The change speed of the hole diameter of the connecting through-hole247gradually decreases, that is, the hole wall2470of the connecting through-hole247is recessed away from a center line of the connecting through-hole247. Specifically, the fifth side wall2471and the sixth side wall2472each may be a surface recessed away from the center line of the first explosion-proof valve through-hole246.

It may be noted that, the hole wall of the first pole through-hole244, the hole wall of the second pole through-hole245, the hole wall of the first explosion-proof valve through-hole246, and the hole wall of the connecting through-hole247mentioned above each may be recessed away from or protruded toward the center line of the hole wall thereof. However, the structure of the top patch240provided in the present disclosure is not limited to the foregoing implementations, and the hole wall of the first pole through-hole244, the hole wall of the second pole through-hole245, the hole wall of the first explosion-proof valve through-hole246, and the hole wall of the connecting through-hole247each may have one or more of a surface protruding toward the center lines thereof, a surface recessed away from the center lines thereof, or a flat surface. This is not strictly limited in embodiments of the present disclosure.

It may be understood that, that the hole wall2470of the connecting through-hole247is a surface with a variable slope may be adapted for more use scenarios, and this is not strictly limited in embodiments of the present disclosure.

Referring toFIG.12again, the fifth side wall2471includes a fifth end2473and a sixth end2474arranged opposite to each other in direction X. The fifth end2473is arranged toward the second pole through-hole245, and the sixth end2474is arranged toward the first explosion-proof valve through-hole246. The sixth side wall2472includes a seventh end2475and an eighth end2476arranged opposite to each other in direction X. The seventh end2475is arranged toward the second pole through-hole245, and the eighth end2476is arranged toward the first explosion-proof valve through-hole246.

In embodiments of the present disclosure, the hole wall2470of the connecting through-hole247is connected to the hole wall2451of the second pole through-hole245through a first curved surface248. A radius of curvature of the first curved surface248ranges from 1 mm to 5 mm (including end point values of 1 mm and 5 mm). Specifically, the fifth end2473of the fifth side wall2471is connected to the hole wall2451of the second pole through-hole245through one first curved surface248. Specifically, the seventh end2475of the sixth side wall2472is connected to the hole wall2451of the second pole through-hole245through the other first curved surface248.

It may be understood that, the hole wall2470of the connecting through-hole247is smoothly connected to the hole wall2451of the second pole through-hole245through the first curved surface248, so that the top patch240may have a relatively smooth inner edge. The relatively smooth inner edge can avoid scratching and wear of a wrapping film250, the smooth aluminum sheet230, or an electrode caused by a sharp edge when the top patch240is assembled with another component of the energy-storage apparatus200. The relatively smooth inner edge can also make the top patch240have good mounting stability, which is beneficial to avoid warpage of edges of through holes in a middle part of the top patch240due to poor coordination with the smooth aluminum sheet230during installation, and an adverse effect on mounting reliability of the top patch240.

In embodiments of the present disclosure, the hole wall2470of the connecting through-hole247is connected to the hole wall of the first explosion-proof valve through-hole246through a second curved surface249. A radius of curvature of the second curved surface249ranges from 1 mm to 5 mm (including end point values of 1 mm and 5 mm). Specifically, the sixth end2474of the fifth side wall2471is connected to one end of the first side wall2461of the first explosion-proof valve through-hole246through one second curved surface249. The seventh end2475of the sixth side wall2472is connected to another end of the first side wall2461of the first explosion-proof valve through-hole246through the other second curved surface249.

It may be understood that, the hole wall2460of the first explosion-proof valve through-hole246of the top patch240is smoothly connected to the hole wall2470of the connecting through-hole247of the top patch240through the second curved surface249, so that the inner edge of the top patch240does not have a relatively sharp angle, thereby avoiding an operation of accurately aligning the top patch240with the smooth aluminum sheet230at a sharp corner, and simplifying a coordination connection process between the top patch240and the smooth aluminum sheet230.

Referring toFIG.4, the connecting through-hole247may be an identification-through hole, and an identification2310arranged on the first surface2312of the smooth aluminum sheet230may be exposed beyond the identification through-hole. With such arrangement, the identification2310at a position of the smooth aluminum sheet230corresponding to the connecting through-hole247may be exposed beyond the connecting through-hole247. In addition, since the top patch240and the negative electrode protrusion233are arranged around the identification2310, and a position of the identification2310is recessed relative to the top patch240and the negative electrode protrusion233, the position of the identification2310is unlikely to be scratched by foreign objects and has good reliability.

Referring toFIG.12again, a distance between the hole wall2451of the second pole through-hole245and the outer edge of the top patch240in the width direction (that is, direction Y) of the smooth aluminum sheet230is a second distance L2. The second distance L2is also a narrowest portion of a physical structure of the top patch240. The second distance L2may range from 2 mm to 5 mm (including endpoint values of 2 mm and 5 mm). It is to be noted that, the distance between the hole wall2451of the second pole through-hole245and the outer edge of the top patch240may be the same as or different from a distance between the first pole through-hole244and the outer edge of the top patch240.

In a possible implementation, the second distance L2is greater than the third distance L3. In other words, in the width direction (that is, direction Y) of the smooth aluminum sheet230, a width of the narrowest portion of the top patch240is greater than the width of the wrapping film250covering the portion of the first surface2312of the smooth aluminum sheet230. With such arrangement, the top patch240can completely cover the edge of the wrapping film250on the first surface2312of the smooth aluminum sheet230, so that after the top patch240is connected to the smooth aluminum sheet230, warpage of a portion of the edge of the wrapping film250on the surface of the smooth aluminum sheet230can be avoided.

For example, the second distance L2may also be less than the first distance L1. In other words, in the width direction (that is, direction Y) of the smooth aluminum sheet230, the width of the narrowest portion of the top patch sheet240is less than a width between the positive electrode protrusion232and/or the negative electrode protrusion233of the smooth aluminum sheet230and the outer edge of the smooth aluminum sheet230. Therefore, after the top patch240is attached to the smooth aluminum sheet230, the top patch240may not fall off because the outer edge of the top patch240protrudes relative to the outer edge of the smooth aluminum sheet230.

Further, a difference between the first distance L1and the second distance L2may be greater than a difference between the second distance L2and the third distance L3. In other words, in the width direction (that is, direction Y) of the smooth aluminum sheet230, a difference between the width of the narrowest portion of the top patch240and the distance between the protrusion (the positive electrode protrusion232and/or the negative electrode protrusion233) of the smooth aluminum sheet230and the outer edge of the smooth aluminum sheet230is greater than a difference between the width of the narrowest portion of the top patch240and a width of the wrapping film250on the first surface2312.

In this way, the top patch240may completely cover the edge of the wrapping film250on the first surface2312, and a portion of the top patch240may also be attached to the smooth aluminum sheet230, thereby better pressing the edge of the wrapping film250on the smooth aluminum sheet230.

Still referring toFIG.11andFIG.12, the top patch240includes a liquid-injection-hole sealing-portion2401. The liquid-injection-hole sealing-portion2401is between the first pole through-hole244and the first explosion-proof valve through-hole246. The liquid-injection-hole sealing-portion2401includes a sealing surface2402, where the sealing surface2402is a part of a surface of the top patch240facing the smooth aluminum sheet230. The top patch240further includes an adhesive layer2403. The adhesive layer2403is arranged on the sealing surface2402. The adhesive layer2403is spaced apart from an edge of the first pole through-hole244, an edge of the second pole through-hole245, and an edge of the top patch240, to prevent an adhesive from overflowing to the liquid-injection-hole sealing-portion2401and causing adverse effects on the operating performance of the energy-storage apparatus200. The liquid-injection-hole sealing-portion2401is connected to the liquid-injection hole235through the adhesive layer2403, so that the adhesive layer2403seals the liquid-injection hole235.

It may be understood that, sealing performance of the liquid-injection hole235has a great influence on a service life and performance of the energy-storage apparatus200. If the liquid-injection hole of the energy-storage apparatus is not sealed, an electrolyte solution or other components inside the energy-storage apparatus may be oxidized and corroded by external gas or foreign matters. The top patch240of the present disclosure can seal the liquid-injection hole235of the smooth aluminum sheet230while connecting the top patch240to the smooth aluminum sheet230by arranging the adhesive layer2403and enabling the adhesive layer2403to seal the liquid-injection hole235, thereby reducing occurrence of electrolyte leakage and the like in the liquid-injection hole235of the energy-storage apparatus200.

In addition, since the liquid-injection-hole top-surface2353is recessed relative to the smooth aluminum-sheet body231, and the adhesive layer2403located on the sealing surface2402of the top patch240is protruded relative to the surface of the top patch240, after the adhesive layer2403is correspondingly connected to the liquid-injection hole235, at least a part of the adhesive layer2403can be accommodated in the liquid-injection hole235, so that the top patch240can be more flatly attached to the surface of the smooth aluminum sheet230, thereby improving flatness of installation of the top patch240.

The embodiments of the present disclosure are introduced in detail above. The principles and implementations of the present disclosure are described by applying specific examples in this specification, and the descriptions of the embodiments are merely intended to help understand the method and the core ideas of the present disclosure. Meanwhile, a person of ordinary skill in the art may make modifications to the specific implementations and application scopes according to the ideas of the present disclosure. In conclusion, the content of the specification may not be construed as a limitation to the present disclosure.