Patent Description:
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.

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. Relevant state of the art is known from documents <CIT> Band <CIT>.

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 terminal through-hole and a first hole spaced apart from the first terminal 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 terminal 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 terminal through-hole, a hole wall of the second terminal 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 terminal through-hole, the hole wall of the second terminal through-hole, and the hole wall of the first explosion-proof valve through-hole is inclined relative to the connecting surface ranges from <NUM> degrees to <NUM> 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 the top patch that is described above. The top patch is attached to a top surface of the smooth aluminum sheet.

In a third aspect, an electricity-consumption device is provided in the present disclosure. The electricity-consumption device includes the energy-storage apparatus as described above.

To describe technical solutions in the present disclosure more clearly, the following briefly introduces the accompanying drawings required for describing implementations. Apparently, the accompanying drawings in the following description show merely some implementations of the present disclosure, and a person of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts.

Reference signals: electricity-consumption device <NUM>; power system <NUM>; energy-storage apparatus <NUM>; housing <NUM>; smooth aluminum sheet <NUM>; top patch <NUM>; wrapping film <NUM>; smooth aluminum-sheet body <NUM>; positive electrode protrusion <NUM>; negative electrode protrusion <NUM>; second explosion-proof valve through-hole <NUM>; liquid-injection hole <NUM>; through hole <NUM>; identification <NUM>; second outer vertex-corner <NUM>; first surface <NUM>; second surface <NUM>; first end <NUM>; second end <NUM>; first cavity <NUM>; second cavity <NUM>; positive electrode through-hole <NUM>; first top-surface <NUM>; first bottom-surface <NUM>; first peripheral-side-surface <NUM>; first side surface <NUM>; second side surface <NUM>; third side surface <NUM>; fourth side surface <NUM>; negative electrode through-hole <NUM>; second top-surface <NUM>; second bottom-surface <NUM>; second peripheral-side-surface <NUM>; fifth side surface <NUM>; sixth side surface <NUM>; seventh side surface <NUM>; eighth side surface <NUM>; liquid-injection-hole top-surface <NUM>; liquid-injection-hole bottom-surface <NUM>; sealing member <NUM>; first outer vertex-corner <NUM>; third end <NUM>; fourth end <NUM>; first hole <NUM>; first wall <NUM>; second wall <NUM>; side wall <NUM>; extension bump <NUM>; first terminal through-hole <NUM>; second terminal through-hole <NUM>; first explosion-proof valve through-hole <NUM>; connecting through-hole <NUM>; hole wall <NUM> of connecting through-hole; first side wall <NUM>; second side wall <NUM>; third side wall <NUM>; fourth side wall <NUM>; explosion-proof valve <NUM>; fifth side wall <NUM>; sixth side wall <NUM>; liquid-injection-hole sealing-portion <NUM>; sealing surface <NUM>; adhesive layer <NUM>; hole wall <NUM> of first terminal through-hole; connecting surface <NUM>; hole wall <NUM> of second terminal through-hole; hole wall <NUM> of first explosion-proof valve through-hole; first curved surface <NUM>; second curved surface <NUM>; fifth end <NUM>; sixth end <NUM>; seventh end <NUM>; eighth end <NUM>; angle α1 between hole wall of first terminal through-hole and connecting surface; angle α2 between hole wall of second terminal through-hole and connecting surface; angle α3 between hole wall of first explosion-proof valve through-hole and connecting surface; angle α4 between hole wall of connecting through-hole and connecting surface.

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

"And/or" is only an association relationship for describing associated objects and represents that three relationships may exist.

"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.

Referring to <FIG> is a schematic structural diagram of an electricity-consumption device <NUM> according to an embodiment of the present disclosure. The electricity-consumption device <NUM> includes a power system <NUM> and an energy-storage apparatus <NUM>. The power system <NUM> is electrically connected to the energy-storage apparatus <NUM>. The energy-storage apparatus <NUM> provides a power source for the power system <NUM>.

Descriptions are provided below by using an example in which the electricity-consumption device <NUM> is 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 apparatus <NUM> may 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 apparatus <NUM> is a single battery, the battery may be a prismatic battery. Descriptions are provided below by using an example in which the energy-storage apparatus <NUM> is a prismatic battery, but it may be understood that, the energy-storage apparatus is not limited thereto.

It may be noted that, the vehicle is only a use scenario of the energy-storage apparatus <NUM> provided in the present disclosure. In other scenarios, the energy-storage apparatus <NUM> can also be used for another electronic device or mechanical device, and is not limited to the vehicle. Certainly, the energy-storage apparatus <NUM> of 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 apparatus <NUM> is not specifically limited in the present disclosure.

Referring to <FIG> is a schematic structural diagram of the energy-storage apparatus <NUM> shown in <FIG>. For ease of description, a length direction of the energy-storage apparatus <NUM> shown in <FIG> is 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 apparatus <NUM> includes an electrode assembly (not shown in <FIG>), a housing <NUM>, a smooth aluminum sheet <NUM>, and a top patch <NUM>. One end of the housing <NUM> defines an opening, and the housing <NUM> has an accommodating space. The electrode assembly is mounted in the accommodating space of the housing <NUM>. The smooth aluminum sheet <NUM> is connected to the opening of the housing <NUM>, and cooperates with the housing <NUM> to encapsulate the electrode assembly. For example, the housing <NUM> is a metal housing such as an aluminum housing. Certainly, the housing <NUM> may 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 to <FIG> is a schematic structural diagram of fitting of the smooth aluminum sheet <NUM> and the top patch <NUM> shown in <FIG>. The energy-storage apparatus <NUM> further includes a positive terminal (not shown in <FIG>), a negative terminal (not shown in <FIG>), the smooth aluminum sheet <NUM>, and the top patch <NUM>.

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

Referring to <FIG> is a schematic structural diagram of the smooth aluminum sheet <NUM> shown in <FIG> at an angle. The smooth aluminum sheet <NUM> is connected to the opening of the housing <NUM>. For example, the smooth aluminum sheet <NUM> may be welded to the housing <NUM> to isolate the interior of the energy-storage apparatus <NUM> and exterior of the energy-storage apparatus <NUM>.

The smooth aluminum sheet <NUM> includes a smooth aluminum-sheet body <NUM>, a positive electrode protrusion <NUM>, a negative electrode protrusion <NUM>, a second explosion-proof valve through-hole <NUM>, and a liquid-injection hole <NUM>.

An outer contour of the smooth aluminum-sheet body <NUM> is rectangular in shape. The smooth aluminum-sheet body <NUM> includes four second outer vertex-corners <NUM> that are at an outer edge of the smooth aluminum sheet <NUM> and that are sequentially arranged. The four second outer vertex-corners <NUM> are four corners of an outer edge of the smooth aluminum-sheet body <NUM>.

In a possible implementation, at least one second outer vertex-corner <NUM> of the four second outer vertex-corners <NUM> may be a rounded corner. Descriptions are provided below by using an example in which the four second outer vertex-corners <NUM> are 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-corners <NUM> of the smooth aluminum-sheet body <NUM> are all configured as rounded corners, so that the smooth aluminum-sheet body <NUM> may have a relatively smooth outer edge. On one hand, the smooth outer edge can prevent the smooth aluminum sheet <NUM> from scratching and wearing another component (such as a wrapping film <NUM>) or being pierced by another component due to a sharp edge when assembled with another component (such as the top patch <NUM>) in the energy-storage apparatus <NUM>. On the other hand, the smooth outer edge can also make the smooth aluminum sheet <NUM> have good mounting stability, which is beneficial to avoid warpage around the smooth aluminum sheet <NUM> due to contact with another component in the energy-storage apparatus <NUM> during installation, and an adverse effect on mounting reliability of the smooth aluminum sheet <NUM>.

For example, a corner radius of the second outer vertex-corner <NUM> ranges from <NUM> to <NUM> (including endpoint values of <NUM> and <NUM>). It may 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 housing <NUM> during assembly. If the corner of the second outer vertex-corner is set too small, mounting of the top patch <NUM> may be adversely affected during subsequent assembly with the top patch <NUM>. The corner radius of the second outer vertex-corner <NUM> is set within this range, so that when the smooth aluminum sheet <NUM> meets an assembly standard, warpage around the top patch <NUM> that is caused by touching a sharp corner in a subsequent process and further causes the top patch <NUM> to fall can be avoided, and the reliability is excellent.

Still referring to <FIG>, in embodiments of the present disclosure, the smooth aluminum-sheet body <NUM> has a first surface <NUM> and a second surface <NUM> that are opposite to each other. The first surface <NUM> is a surface of the smooth aluminum-sheet body <NUM> facing the top patch <NUM>, and the second surface <NUM> is a surface in the smooth aluminum-sheet body <NUM> facing the housing <NUM>. The smooth aluminum-sheet body <NUM> includes a first end <NUM> and a second end <NUM>. The second end <NUM> and the first end <NUM> are arranged opposite to each other in direction X.

Referring to <FIG> is a schematic structural diagram of the smooth aluminum sheet <NUM> shown in <FIG> at another angle. The smooth aluminum-sheet body <NUM> defines a first cavity <NUM> and a second cavity <NUM>. The first cavity <NUM> is defined at the first end <NUM>, the first cavity <NUM> is recessed from the second surface <NUM> toward the first surface <NUM>, and the first cavity <NUM> is configured for accommodating another component (such as a lower plastic component ) in the energy-storage apparatus <NUM>. The second cavity <NUM> is defined at the second end <NUM>, the second cavity <NUM> is recessed from the second surface <NUM> toward the first surface <NUM>, and the second cavity <NUM> is configured for accommodating another component (such as lower plastic component) in the energy-storage apparatus <NUM>.

Referring to <FIG> and <FIG> is a schematic structural diagram of the smooth aluminum sheet <NUM> shown in <FIG> at yet another angle. The positive electrode protrusion <NUM> is arranged at the first end <NUM> of the smooth aluminum-sheet body <NUM>, and the positive electrode protrusion <NUM> protrudes relative to the first surface <NUM> of the smooth aluminum-sheet body <NUM>. The positive electrode protrusion <NUM> protrudes relative to the smooth aluminum-sheet body <NUM>, so that a good reminding effect can be achieved, and when assembling the energy-storage apparatus <NUM>, an operator can align each component of the smooth aluminum sheet <NUM> to the top patch <NUM> without paying too much attention, which improves assembly efficiency of the energy-storage apparatus <NUM> and assembly accuracy of each component in the energy-storage apparatus <NUM>. For example, an outer diameter of the positive electrode protrusion <NUM> gradually decreases in a direction from the first surface <NUM> of the smooth aluminum-sheet body <NUM> to the top patch <NUM>.

The positive electrode protrusion <NUM> defines a positive electrode through-hole <NUM>. The positive electrode through-hole <NUM> extends through the positive electrode protrusion <NUM> in direction Z. The positive electrode through-hole <NUM> is communicated with the first cavity <NUM>. The positive electrode through-hole <NUM> is used for the positive terminal to pass through.

Referring to <FIG>, <FIG> is a schematic cross-sectional view of plane A-A of the smooth aluminum sheet <NUM> shown in <FIG>. The positive electrode protrusion <NUM> further has a first top-surface <NUM>, a first bottom-surface <NUM> opposite to the first top-surface <NUM>, and a first peripheral-side-surface <NUM>.

The first top-surface <NUM> is a surface of the positive electrode protrusion <NUM> away from the first surface <NUM>. The first top-surface <NUM> may be rectangular. Four vertex corners of the first top-surface <NUM> are rounded corners.

The first bottom-surface <NUM> is a surface of the positive electrode protrusion <NUM> facing the housing <NUM>, the first bottom-surface <NUM> is connected to an opening of the first cavity <NUM> on a side of the first surface <NUM>, and the first bottom-surface <NUM> closes the opening. The first bottom-surface <NUM> is flush with the first surface <NUM> of the smooth aluminum-sheet body <NUM>. The first bottom-surface <NUM> may be rectangular. Four vertex corners of the first bottom-surface <NUM> are rounded corners.

Still referring to <FIG> and <FIG>, the first peripheral-side-surface <NUM> connects the first surface <NUM> to the first top-surface <NUM>. The first peripheral-side-surface <NUM> may 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 protrusion <NUM> are configured as a curved surface transition, to prevent the smooth aluminum sheet <NUM> from scratching an operator or scratching another component (such as the wrapping film <NUM> covering the housing <NUM>) due to a sharp edge when assembled with another component of the energy-storage apparatus <NUM>. Moreover, a curved surface structure can also play a guiding role in a subsequent mounting process of the top patch <NUM>, so that the top patch <NUM> can be more easily aligned with the smooth aluminum sheet <NUM>.

For example, a radian of the curved surface ranges from <NUM> to <NUM> (including endpoint values of <NUM> and <NUM>).

Specifically, the four side surfaces of the first peripheral-side-surface <NUM> may include a first side surface <NUM>, a second side surface <NUM>, a third side surface <NUM>, and a fourth side surface <NUM>. The first side surface <NUM> and the second side surface <NUM> are arranged opposite to each other in direction X. The third side surface <NUM> and the fourth side surface <NUM> are arranged opposite to each other in direction Y. The first side surface <NUM>, the third side surface <NUM>, the second side surface <NUM>, and the fourth side surface <NUM> are sequentially connected to form the first peripheral-side-surface <NUM> of the positive electrode protrusion <NUM>. Since four vertex corners of the first top-surface <NUM> and four vertex corners of the first bottom-surface <NUM> are all rounded corners, the first side surface <NUM> is smoothly connected to the third side surface <NUM> by using a curved surface, the third side surface <NUM> is smoothly connected to the second side surface <NUM> by using a curved surface, the second side surface <NUM> is smoothly connected to the fourth side surface <NUM> by using a curved surface, and the fourth side surface <NUM> is smoothly connected to the first side surface <NUM> by using a curved surface.

Still referring to <FIG> and <FIG>, the negative electrode protrusion <NUM> is arranged at the second end <NUM> of the smooth aluminum-sheet body <NUM>, and the negative electrode protrusion <NUM> protrudes relative to the first surface <NUM> of the smooth aluminum-sheet body <NUM>. The negative electrode protrusion <NUM> protrudes relative to the smooth aluminum-sheet body <NUM>, so that a good reminding effect can be achieved, and when assembling the energy-storage apparatus <NUM>, an operator can align each component of the smooth aluminum sheet <NUM> to the top patch <NUM> without paying too much attention, which improves assembly efficiency of the energy-storage apparatus <NUM> and assembly accuracy of each component in the energy-storage apparatus <NUM>. For example, an outer diameter of the negative electrode protrusion <NUM> gradually decreases in the direction from the first surface <NUM> of the smooth aluminum-sheet body <NUM> to the top patch <NUM>.

The negative electrode protrusion <NUM> defines a negative electrode through-hole <NUM>. The negative electrode through-hole <NUM> extends through the negative electrode protrusion <NUM> in direction Z. The negative electrode through-hole <NUM> is communicated with the second cavity <NUM>. The negative electrode through-hole <NUM> is used for the negative terminal to pass through.

Referring to <FIG>, <FIG>, and <FIG> is a schematic cross-sectional view of plane B-B of the smooth aluminum sheet <NUM> shown in <FIG>. The negative electrode protrusion <NUM> further has a second top-surface <NUM>, a second bottom-surface <NUM> opposite to the second top-surface <NUM>, and a second peripheral-side-surface <NUM>.

The second top-surface <NUM> is a surface of the negative electrode protrusion <NUM> away from the first surface <NUM>. The second top-surface <NUM> may be rectangular. Four vertex corners of the second top-surface <NUM> are rounded corners.

The second bottom-surface <NUM> is a surface of the negative electrode protrusion <NUM> facing the housing <NUM>, the second bottom-surface <NUM> is connected to an opening of the second cavity <NUM> on the side of the first surface <NUM>, and the second bottom-surface <NUM> closes the opening. The second bottom-surface <NUM> is flush with the first surface <NUM> of the smooth aluminum-sheet body <NUM>. The second bottom-surface <NUM> may be rectangular. Four vertex corners of the second bottom-surface <NUM> are rounded corners.

Referring to <FIG> and <FIG> again, the second peripheral-side-surface <NUM> connects the first surface <NUM> to the second top-surface <NUM>. The second peripheral-side-surface <NUM> may 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 protrusion <NUM> is a rounded corner. Four outer corners of the negative electrode protrusion <NUM> are configured as a curved surface transition, to prevent the smooth aluminum sheet <NUM> from scratching an operator or scratching another component (such as the wrapping film <NUM> covering the housing <NUM>) due to a sharp edge when assembled with another component of the energy-storage apparatus <NUM>. Moreover, a curved surface structure can also play a guiding role in a subsequent mounting process of the top patch <NUM>, so that the top patch <NUM> can be more easily aligned with the smooth aluminum sheet <NUM>.

Specifically, the four side surfaces of the second peripheral-side-surface <NUM> may include a fifth side surface <NUM>, a sixth side surface <NUM>, a seventh side surface <NUM>, and an eighth side surface <NUM>. The fifth side surface <NUM> and the sixth side surface <NUM> are arranged opposite to each other in direction X. The seventh side surface <NUM> and the eighth side surface <NUM> are arranged opposite to each other in direction Y. The fifth side surface <NUM>, the seventh side surface <NUM>, the sixth side surface <NUM>, and the eighth side surface <NUM> are sequentially connected form the second peripheral-side-surface <NUM> of the negative electrode protrusion <NUM>. Since four vertex corners of the second top-surface <NUM> and four vertex corners of the second bottom-surface <NUM> are all rounded corners, the fifth side surface <NUM> is smoothly connected to the seventh side surface <NUM> by using a curved surface, the seventh side surface <NUM> is smoothly connected to the sixth side surface <NUM> by using a curved surface, the sixth side surface <NUM> is smoothly connected to the eighth side surface <NUM> by using a curved surface, and the eighth side surface <NUM> is smoothly connected to the fifth side surface <NUM> by using a curved surface.

The second explosion-proof valve through-hole <NUM> is between the positive electrode protrusion <NUM> and the negative electrode protrusion <NUM>. The second explosion-proof valve through-hole <NUM>, the positive electrode protrusion <NUM>, and the negative electrode protrusion <NUM> are arranged at intervals. The second explosion-proof valve through-hole <NUM> extends through the smooth aluminum-sheet body <NUM> of the smooth aluminum sheet <NUM> in direction Z. The second explosion-proof valve through-hole <NUM> is configured to connect an explosion-proof valve of the energy-storage apparatus <NUM>.

Referring to <FIG> and <FIG> is a schematic cross-sectional view of plane C-C of the smooth aluminum sheet <NUM> shown in <FIG>. The liquid-injection hole <NUM> is located between the positive electrode protrusion <NUM> and the second explosion-proof valve through-hole <NUM>, and the liquid-injection hole <NUM>, the positive electrode protrusion <NUM>, and the second explosion-proof valve through-hole <NUM> are arranged at intervals.

The liquid-injection hole <NUM> may be a blind hole. As shown in <FIG>, the liquid-injection hole <NUM> is in an open state when the energy-storage apparatus <NUM> is not assembled, and the liquid-injection hole <NUM> is a through hole <NUM>. The through hole <NUM> extends through the smooth aluminum-sheet body <NUM> in direction Z. As shown in <FIG>, the through hole <NUM> is connected to a sealing member <NUM> after the energy-storage apparatus <NUM> is assembled. The sealing member <NUM> seals the through hole <NUM> to form the liquid-injection hole <NUM> that is recessed relative to the first surface <NUM>. The liquid-injection hole <NUM> has a liquid-injection-hole top-surface <NUM> and a liquid-injection-hole bottom-surface <NUM> opposite to the liquid-injection-hole top-surface <NUM> in an opposite direction of direction Z. The liquid-injection-hole top-surface <NUM> is recessed relative to the first surface <NUM>, and the liquid-injection-hole bottom-surface <NUM> may protrude relative to the second surface <NUM>.

Since the liquid-injection hole <NUM> is recessed relative to the first surface <NUM>, and a recessed direction of the liquid-injection hole <NUM> is opposite to a protruding direction of the positive electrode protrusion <NUM> and a protruding direction of the negative electrode protrusion <NUM>. Therefore, after liquid injection into the through hole <NUM> is completed and the sealing member <NUM> is welded to the through hole <NUM> to form the liquid-injection hole <NUM>, the liquid-injection hole <NUM> may not protrude relative to the first surface <NUM> of the smooth aluminum-sheet body <NUM>. In this arrangement, the smooth aluminum-sheet body <NUM> has good flatness, so that when the top patch <NUM> is subsequently mounted, the top patch <NUM> may be flush with and attached to the first surface <NUM> of the smooth aluminum-sheet body <NUM>, the top patch <NUM> will not be unable to be flush with and attached to the first surface <NUM> of the smooth aluminum-sheet body <NUM> due to the protrusion on the first surface <NUM>, and the top patch <NUM> is unlikely to be fallen off from the smooth aluminum sheet <NUM>.

For example, the liquid-injection hole <NUM> is recessed relative to the first surface <NUM> at a distance ranging from <NUM> to <NUM> (including endpoint values of <NUM> and <NUM>).

Referring to <FIG> is a schematic top view of fitting of the smooth aluminum sheet <NUM> shown in <FIG> and a wrapping film <NUM>. The energy-storage apparatus <NUM> may further include a wrapping film <NUM>. The wrapping film <NUM> may be attached to an outer surface of the housing <NUM>, thereby protecting the housing <NUM> of the energy-storage apparatus <NUM> and internal components of the housing <NUM>. The wrapping film <NUM> covers the housing, and an edge of the wrapping film <NUM> covers an edge of a portion of the smooth aluminum sheet <NUM>.

In the width direction (that is, direction Y) of the smooth aluminum sheet <NUM>, a distance between the negative electrode protrusion <NUM> and the outer edge of the smooth aluminum-sheet body <NUM> may be a first distance L1, and a width of the wrapping film <NUM> covering a portion of the first surface <NUM> of the smooth aluminum-sheet body <NUM> may be a third distance L3.

It may be noted that, the distance between the negative electrode protrusion <NUM> and the outer edge of the smooth aluminum sheet <NUM> may be the same as or different from a distance between the positive electrode protrusion <NUM> and the outer edge of the smooth aluminum sheet <NUM>.

Referring to <FIG>, <FIG>, and <FIG>, <FIG> is a schematic structural diagram of the top patch <NUM> shown in <FIG>, and <FIG> is a schematic top view of the top patch <NUM> shown in <FIG>.

The top patch <NUM> is attached to a top end of the smooth aluminum sheet <NUM>. The top patch <NUM> has a connecting surface <NUM>. The connecting surface <NUM> of the top patch <NUM> is connected to the first surface <NUM> of the smooth aluminum sheet <NUM>. The top patch <NUM> may be an insulator. On one hand, the top patch <NUM> may be disposed to achieve an insulation effect, to prevent the energy-storage apparatus <NUM> from being short-circuited with another circuit. On the other hand, the smooth aluminum sheet <NUM> of the energy-storage apparatus <NUM> can be protected to prevent the smooth aluminum sheet <NUM> from being directly impacted by an external force and being damaged.

The top patch <NUM> is rectangular. A shape of the top patch <NUM> may be the same as a shape of the smooth aluminum sheet <NUM>. The top patch <NUM> includes four first outer vertex-corners <NUM> that are located at the outer edge of the top patch <NUM> and that are sequentially arranged, and the four first outer vertex-corners <NUM> are four corners of an outer edge of the top patch <NUM>.

In a possible implementation, at least one first outer vertex-corner <NUM> in the four first outer vertex-corners <NUM> is a rounded corner. Descriptions are provided below by using an example in which the four first outer vertex-corners <NUM> are 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-corners <NUM> of the top patch <NUM> are all configured as rounded corners, so that the top patch <NUM> may have a relatively smooth outer edge. On one hand, the smooth outer edge can prevent the top patch <NUM> from 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 film <NUM> covering the housing <NUM>) of the energy-storage apparatus <NUM>. On the other hand, the smooth outer edge can also make the top patch <NUM> have good mounting stability, which is beneficial to avoid warpage around the top patch <NUM> due to contact with another component in the energy-storage apparatus <NUM> during installation, and an adverse effect on mounting reliability of the top patch <NUM>. For example, a corner radius of the first outer vertex-corner <NUM> may range from <NUM> to <NUM> (including endpoint values of <NUM> and <NUM>).

In this implementation, the corner radius of the first outer vertex-corner <NUM> of the top patch <NUM> may be greater than the corner radius of the second outer vertex-corner <NUM> of the smooth aluminum sheet <NUM>. In addition, a straight edge of an outer contour of the top patch <NUM> may be flush with a straight edge of an outer contour of the smooth aluminum sheet <NUM> in direction Y. Alternatively, the straight edge of the outer contour of the top patch <NUM> may be recessed relative to the outer contour of the smooth aluminum sheet <NUM> in direction Y.

It may be understood that, since the top patch <NUM> and the smooth aluminum sheet <NUM> are both rectangular, a center angle corresponding to the first outer vertex-corner <NUM> of the top patch <NUM> and a center angle corresponding to the second outer vertex-corner <NUM> of the smooth aluminum sheet <NUM> are both <NUM> degrees. When the corner radius of the first outer vertex-corner <NUM> is greater than the corner radius of the second outer vertex-corner <NUM>, a vertex corner of the top patch <NUM> is inwardly contracted relative to the smooth aluminum sheet <NUM>, and the top patch <NUM> is completely located on a surface of the smooth aluminum sheet <NUM>. In other words, the top patch <NUM> may not exceed relative to the edge of the smooth aluminum sheet <NUM>, thereby preventing the top patch <NUM> from being removed from the smooth aluminum sheet <NUM> or preventing the vertex corner of the top patch <NUM> from warping relative to the smooth aluminum sheet <NUM>.

Still referring to <FIG> and <FIG>, the top patch <NUM> includes a third end <NUM> and a fourth end <NUM>. The fourth end <NUM> and the third end <NUM> are arranged opposite to each other in direction X. The top patch <NUM> further defines a first terminal through-hole <NUM> and a first hole <NUM>. The first hole <NUM> includes two side walls <NUM> arranged opposite to each other in direction Y. The two side walls <NUM> are respectively a first wall <NUM> and a second wall <NUM>. Each of two side walls <NUM> is provided with an extension bump <NUM>, and extension bumps <NUM> of the two side walls <NUM> are arranged opposite to each other. The first hole <NUM> at one side of the extension bump <NUM> forms a first explosion-proof valve through-hole <NUM>, and the first hole <NUM> at the other side of the extension bump <NUM> forms a second terminal through-hole <NUM>. A connecting through-hole <NUM> is defined between the two extension bumps <NUM>. The extension bump <NUM> further has a first curved surface <NUM> and a second curved surface <NUM>. One of the positive electrode protrusion <NUM> or the negative electrode protrusion <NUM> of the smooth aluminum sheet <NUM> may be exposed beyond the first terminal through-hole <NUM>, and the other of the positive electrode protrusion <NUM> or the negative electrode protrusion <NUM> of the smooth aluminum sheet <NUM> may be exposed beyond the second terminal through-hole <NUM>.

For example, in a width direction of the top patch <NUM>, a length (W) of the extension bumps <NUM> protruding relative to the side wall <NUM> ranges from <NUM> to <NUM> (including endpoint values of <NUM> and <NUM>). A distance between an edge of the top patch <NUM> and the second terminal through-hole <NUM> ranges from <NUM> to <NUM> (including end point values of <NUM> and <NUM>). In addition, a ratio of a width of the second terminal through-hole <NUM> to a distance L2 between a hole wall <NUM> of the second terminal through-hole <NUM> and the outer edge of the top patch <NUM> may range from <NUM>/<NUM> to <NUM>/<NUM> (including end point values of <NUM>/<NUM> and <NUM>/<NUM>).

In a possible implementation, the positive electrode protrusion <NUM> of the smooth aluminum sheet <NUM> is exposed beyond the first terminal through-hole <NUM>, and the negative electrode protrusion <NUM> of the smooth aluminum sheet <NUM> is exposed beyond the second terminal through-hole <NUM>. The first curved surface <NUM> connects the hole wall <NUM> of the second terminal through-hole <NUM> to a hole wall <NUM> of the connecting through-hole <NUM>. The second curved surface <NUM> connects a hole wall <NUM> of the first explosion-proof valve through-hole <NUM> to the hole wall <NUM> of the connecting through-hole <NUM>. 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 terminal through-hole <NUM> is defined at the third end <NUM> of the top patch <NUM>. The first terminal through-hole <NUM> is rectangular, and four vertex corners of the first terminal through-hole <NUM> are rounded corners. A shape of the first terminal through-hole <NUM> may be the same as a shape of the first bottom-surface <NUM> of the positive electrode protrusion <NUM>, and a corner of the first terminal through-hole <NUM> may be greater than or equal to a corner of the first bottom-surface <NUM> of the positive electrode protrusion <NUM>, so that the first terminal through-hole <NUM> can be smoothly sheathed on a peripheral side of the positive electrode protrusion <NUM>, and the positive electrode protrusion <NUM> of the smooth aluminum sheet <NUM> is exposed beyond the first terminal through-hole <NUM>. The first terminal through-hole <NUM> is configured to accommodate the positive electrode protrusion <NUM>. When the top patch <NUM> is attached to the smooth aluminum sheet <NUM>, the positive electrode protrusion <NUM> of the smooth aluminum sheet <NUM> exceeds relative to the top patch <NUM>.

In a possible implementation, there may be a certain gap between a hole wall <NUM> of the first terminal through-hole <NUM> and the peripheral side of the positive electrode protrusion <NUM>, so that the first terminal through-hole <NUM> can be smoothly sheathed on the peripheral side of the positive electrode protrusion <NUM> even if there is a certain machining error.

Referring to <FIG> is a possible schematic cross-sectional view of the top patch <NUM> shown in <FIG> on plane D-D. The hole wall <NUM> of the first terminal through-hole <NUM> is obliquely arranged relative to the connecting surface <NUM>. In other words, a hole diameter of the first terminal through-hole <NUM> gradually changes in a direction from the connecting surface <NUM> and away from the connecting surface <NUM>. For example, as shown in <FIG>, the hole diameter of the first terminal through-hole <NUM> gradually increases in the direction from the connecting surface <NUM> and away from the connecting surface <NUM>.

It may be understood that, the first terminal through-hole <NUM> is defined after cutting a sheet of the top patch <NUM>. In the cutting process, a cutting tool may obliquely cut a corresponding position of the first terminal through-hole <NUM> of the sheet to define the first terminal through-hole <NUM> with the hole wall <NUM> of the first terminal through-hole <NUM> arranged obliquely. After the sheet is obliquely cut, edges of offcuts inside the first terminal through-hole <NUM> forms a sharp corner, which facilitates an operator to separate the offcuts from the edge and take out the offcuts from top patch <NUM>, thereby saving machining time costs of the top patch <NUM>. For example, the cutting of the top patch <NUM> in the present disclosure may be in a form of laser cutting or physical blanking.

An angle α1 at which the hole wall <NUM> of the first terminal through-hole <NUM> is inclined relative to the connecting surface <NUM> ranges from <NUM> degrees to <NUM> degrees. On one hand, the hole wall <NUM> of the first terminal through-hole <NUM> is prevented from being inclined relative to the connecting surface <NUM> at 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 α1 at which the hole wall <NUM> of the first terminal through-hole <NUM> is inclined relative to the connecting surface <NUM> is too small, that is, when the angle α1 at which the hole wall <NUM> of the first terminal through-hole <NUM> is inclined relative to the connecting surface <NUM> approaches <NUM> degrees, an obliquely-cut inclined surface may not have an inward flange, which is inconvenient for removing the offcuts. The angle α1 at which the hole wall <NUM> of the first terminal through-hole <NUM> is inclined relative to the connecting surface <NUM> is set within a reasonable range, so that the offcuts can form a convex edge, thereby facilitating removing of the offcuts. It may be noted that, the angle α1 at which the hole wall <NUM> of the first terminal through-hole <NUM> is inclined relative to the connecting surface <NUM> is a largest angle among angles between a tangent of any point of the first terminal through-hole <NUM> and the connecting surface <NUM>.

It may be understood that, when the angle α1 is within the foregoing range, the operator can more conveniently remove the offcuts in the first terminal through-hole <NUM> from the top patch <NUM>, and the removing effect is better. The top patch <NUM> 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 <NUM>.

In a possible implementation, referring to <FIG> again, the hole wall <NUM> of the first terminal through-hole <NUM> may have a flat surface with a fixed slope. That the hole wall <NUM> of the first terminal through-hole <NUM> has a flat surface with a fixed slope means that the hole wall <NUM> of the first terminal through-hole <NUM> is in a shape of a side surface of a frustum, a hole diameter of the first terminal through-hole <NUM> gradually increases or decreases, and a change speed remains unchanged.

It may be understood that, when the hole wall <NUM> of the first terminal through-hole <NUM> has a flat surface with a fixed slope, there is no need to adjust an angle between a machining tool and the connecting surface <NUM> during machining, the machining tool is less required, and machining accuracy is easy to meet requirements, thereby saving machining costs of the top patch <NUM> and improving a yield of the top patch <NUM>.

In another possible implementation, the hole wall <NUM> of the first terminal through-hole <NUM> may have a surface with a variable slope. That the hole wall <NUM> of the first terminal through-hole <NUM> has a surface with a variable slope means that the hole wall is a curved surface, and the change speed of the hole diameter of the first terminal through-hole <NUM> gradually increases or decreases.

Specifically, referring to <FIG> is another possible schematic cross-sectional view of the top patch <NUM> shown in <FIG> on plane D-D. The change speed of the hole diameter of the first terminal through-hole <NUM> gradually increases, that is, the hole wall <NUM> of the first terminal through-hole <NUM> protrudes toward a center line of the first terminal through-hole <NUM>. Alternatively, referring to <FIG> is yet another possible schematic cross-sectional view of the top patch <NUM> shown in <FIG> on plane D-D. The change speed of the hole diameter of the first terminal through-hole <NUM> gradually decreases, that is, the hole wall <NUM> of the first terminal through-hole <NUM> is recessed away from a center line of the first terminal through-hole <NUM>.

It may be understood that, that the hole wall <NUM> of the first terminal through-hole <NUM> has 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 terminal through-hole <NUM> is defined at the fourth end <NUM> of the top patch <NUM>. The second terminal through-hole <NUM> is rectangular, and four vertex corners of the second terminal through-hole <NUM> are rounded corners. A shape of the second terminal through-hole <NUM> may be the same as a shape of the second bottom-surface <NUM> of the negative electrode protrusion <NUM>, and a corner of the second terminal through-hole <NUM> may be greater than or equal to a corner of the second bottom-surface <NUM> of the negative electrode protrusion <NUM>, so that the second terminal through-hole <NUM> can be smoothly sheathed on a peripheral side of the negative electrode protrusion <NUM>, and the negative electrode protrusion <NUM> of the smooth aluminum sheet <NUM> is exposed beyond the second terminal through-hole <NUM>. The second terminal through-hole <NUM> is configured to accommodate the negative electrode protrusion <NUM>. When the top patch <NUM> is attached to the smooth aluminum sheet <NUM>, the negative electrode protrusion <NUM> of the smooth aluminum sheet <NUM> exceeds relative to the top patch <NUM>.

In a possible implementation, there may be a certain gap between a hole wall <NUM> of the second terminal through-hole <NUM> and the peripheral side of the negative electrode protrusion <NUM>, so that the second terminal through-hole <NUM> can be smoothly sheathed on the peripheral side of the negative electrode protrusion <NUM> even if there is a certain machining error.

It may be understood that, since the positive electrode protrusion <NUM> and the negative electrode protrusion <NUM> are protruded relative to the first surface <NUM>, the first terminal through-hole <NUM> and the second terminal through-hole <NUM> may be mounted in alignment with the positive electrode protrusion <NUM> and the negative electrode protrusion <NUM> in a process of mounting the top patch <NUM>. The first peripheral-side-surface <NUM> of the positive electrode protrusion <NUM> and the second peripheral-side-surface <NUM> of the negative electrode protrusion <NUM> may guide the mounting process of the top patch <NUM>. In addition, since vertex corners of the positive electrode protrusion <NUM> and the negative electrode protrusion <NUM> are both rounded corners, during mounting, the smooth aluminum sheet <NUM> does not have a sharp structure and may not scratch an operator or another component of the energy-storage apparatus <NUM>.

Referring to <FIG> and <FIG> is a possible schematic cross-sectional view of the top patch <NUM> shown in <FIG> on plane E-E. The hole wall <NUM> of the second terminal through-hole <NUM> is obliquely arranged relative to the connecting surface <NUM>. In other words, a diameter of the second terminal through-hole <NUM> gradually changes in a direction from the connecting surface <NUM> and away from the connecting surface <NUM>. For example, as shown in <FIG>, the hole diameter of the second terminal through-hole <NUM> gradually increases in the direction from the connecting surface <NUM> and away from the connecting surface <NUM>.

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

An angle α2 at which the hole wall <NUM> of the second terminal through-hole <NUM> is inclined relative to the connecting surface <NUM> ranges from <NUM> degrees to <NUM> degrees. On one hand, the hole wall <NUM> of the second terminal through-hole <NUM> is prevented from being inclined relative to the connecting surface <NUM> at 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 α2 at which the hole wall <NUM> of the second terminal through-hole <NUM> is inclined relative to the connecting surface <NUM> is too small, that is, when the angle α2 at which the hole wall <NUM> of the second terminal through-hole <NUM> is inclined relative to the connecting surface <NUM> approaches <NUM> degrees, an obliquely-cut inclined surface may not have an inward flange, which is inconvenient for removing the offcuts. The angle α2 at which the hole wall <NUM> of the second terminal through-hole <NUM> is inclined relative to the connecting surface <NUM> is set within a reasonable range, so that the offcuts can form a convex edge, thereby facilitating removing of the offcuts. It may be noted that, the angle α2 at which the hole wall <NUM> of the second terminal through-hole <NUM> is inclined relative to the connecting surface <NUM> is a largest angle among angles between a tangent of any point of the second terminal through-hole <NUM> and the connecting surface <NUM>.

It may be understood that, when the angle α2 is within the foregoing range, the operator can more conveniently remove the offcuts in the second terminal through-hole <NUM> from the top patch, and the removing effect is better, the top patch <NUM> 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 <NUM>.

In a possible implementation, referring to <FIG>, the hole wall <NUM> of the second terminal through-hole <NUM> may have a flat surface with a fixed slope. That the hole wall <NUM> of the second terminal through-hole <NUM> has a flat surface with a fixed slope means that the hole wall <NUM> of the second terminal through-hole <NUM> is in a shape of a side surface of a frustum, a hole diameter of the second terminal through-hole <NUM> gradually increases or decreases, and a change speed remains unchanged.

It may be understood that, when the hole wall <NUM> of the second terminal through-hole <NUM> has 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 patch <NUM>.

In another possible implementation, the hole wall <NUM> of the second terminal through-hole <NUM> may have a surface with a variable slope. That the hole wall <NUM> of the second terminal through-hole <NUM> has a surface with a variable slope means that the hole wall is a curved surface, and the change speed of the hole diameter of the second terminal through-hole <NUM> gradually increases or decreases.

Specifically, referring to <FIG> is another possible schematic cross-sectional view of the top patch <NUM> shown in <FIG> on plane E-E. The change speed of the hole diameter of the second terminal through-hole <NUM> gradually increases, that is, the hole wall <NUM> of the second terminal through-hole <NUM> protrudes toward a center line of the second terminal through-hole <NUM>. Alternatively, referring to <FIG> is yet another possible schematic cross-sectional view of the top patch <NUM> shown in <FIG> on plane E-E. The change speed of the hole diameter of the second terminal through-hole <NUM> gradually decreases, that is, the hole wall <NUM> of the second terminal through-hole <NUM> is recessed away from a center line of the second terminal through-hole <NUM>.

It may be understood that, that the hole wall <NUM> of the second terminal through-hole <NUM> has 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 to <FIG> and <FIG> again, the first explosion-proof valve through-hole <NUM> is between the first terminal through-hole <NUM> and the second terminal through-hole <NUM>. In addition, the first explosion-proof valve through-hole <NUM>, the first terminal through-hole <NUM>, and the second terminal through-hole <NUM> are arranged at intervals. A shape of the first explosion-proof valve through-hole <NUM> may be the same as a shape of the second explosion-proof valve through-hole <NUM> of the smooth aluminum sheet <NUM>, and the first explosion-proof valve through-hole <NUM> and the second explosion-proof valve through-hole <NUM> are defined corresponding to each other and communicate with each other.

The first explosion-proof valve through-hole <NUM> extends through the top patch <NUM> in direction Z. Specifically, the first explosion-proof valve through-hole <NUM> includes a first side wall <NUM> and a second side wall <NUM> arranged opposite to each other in direction X, and a third side wall <NUM> and a fourth side wall <NUM> arranged opposite to each other in direction Y. Each of the first side wall <NUM> and the second side wall <NUM> may be a curved surface. The third side wall <NUM> and the fourth side wall <NUM> each may be a flat surface.

It may be understood that, referring to <FIG> again, in actual use, the smooth aluminum sheet <NUM> may include an explosion-proof valve <NUM>, and the second explosion-proof valve through-hole <NUM> of the smooth aluminum sheet <NUM> may be connected to the explosion-proof valve <NUM> in a sealed manner. The explosion-proof valve <NUM> may be exposed beyond the first explosion-proof valve through-hole <NUM>. When internal pressure of the energy-storage apparatus <NUM> increases due to abnormality of the energy-storage apparatus <NUM>, the internal pressure of the energy-storage apparatus <NUM> can lift the explosion-proof valve <NUM> to complete pressure relief and avoid explosion of the energy-storage apparatus <NUM>.

Referring to <FIG> and <FIG> is a schematic cross-sectional view of the top patch <NUM> shown in <FIG> on plane F-F. The hole wall <NUM> of the first explosion-proof valve through-hole <NUM> is obliquely arranged relative to the connecting surface <NUM>. In other words, a diameter of the first explosion-proof valve through-hole <NUM> gradually changes in a direction from the connecting surface <NUM> and away from the connecting surface <NUM>. For example, as shown in <FIG>, the hole diameter of the first explosion-proof valve through-hole <NUM> gradually increases in the direction from the connecting surface <NUM> and away from the connecting surface <NUM>.

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

An angle α3 at which the hole wall <NUM> of the first explosion-proof valve through-hole <NUM> is inclined relative to the connecting surface <NUM> ranges from <NUM> degrees to <NUM> degrees. It may be noted that, the angle α3 at which the hole wall <NUM> of the first explosion-proof valve through-hole <NUM> is inclined relative to the connecting surface <NUM> is a largest angle among angles between a tangent of any point of the first explosion-proof valve through-hole <NUM> and the connecting surface <NUM>.

It may be understood that, when the angle α3 is within the foregoing range, the operator can more conveniently remove the offcuts in the first explosion-proof valve through-hole <NUM> from the top patch, and the removing effect is better, such that the top patch <NUM> 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 <NUM>.

Specifically, each of the first side wall <NUM>, the second side wall <NUM>, the third side wall <NUM>, and the fourth side wall <NUM> of the first explosion-proof valve through-hole <NUM> may be obliquely arranged relative to the connecting surface <NUM>. The angle α3 between each of the first side wall <NUM>, the second side wall <NUM>, the third side wall <NUM>, and the fourth side wall <NUM> and the connecting surface <NUM> ranges from <NUM> degrees to <NUM> degrees. On one hand, it is avoided that the angle α3 between each of the first side wall <NUM>, the second side wall <NUM>, the third side wall <NUM>, and the fourth side wall <NUM> and the connecting surface <NUM> is 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 α3 between each of the first side wall <NUM>, the second side wall <NUM>, the third side wall <NUM>, and the fourth side wall <NUM> and the connecting surface <NUM> is too small, that is, when the angle α3 between each of the first side wall <NUM>, the second side wall <NUM>, the third side wall <NUM> and the fourth side wall <NUM> and the connecting surface <NUM> approaches <NUM> degrees, an obliquely-cut inclined surface may not have an inward flange, which is inconvenient for removing the offcuts. The angle α3 between each of the first side wall <NUM>, the second side wall <NUM>, the third side wall <NUM>, and the fourth side wall <NUM> and the connecting surface <NUM> 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, referring to <FIG> again, the hole wall <NUM> of the first explosion-proof valve through-hole <NUM> may have a flat surface with a fixed slope. That the hole wall <NUM> of the first explosion-proof valve through-hole <NUM> has a flat surface with a fixed slope means that the hole wall <NUM> of the first explosion-proof valve through-hole <NUM> is in a shape of a side surface of a frustum, a hole diameter of the first explosion-proof valve through-hole <NUM> gradually increases or decreases, and a change speed remains unchanged.

It may be understood that, when the hole wall <NUM> of the first explosion-proof valve through-hole <NUM> has 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 patch <NUM>.

Specifically, the first side wall <NUM>, the second side wall <NUM>, the third side wall <NUM>, and the fourth side wall <NUM> each may be a flat surface. The first side wall <NUM>, the second side wall <NUM>, the third side wall <NUM>, and the fourth side wall <NUM> each are neither protruded nor recessed relative to a center line of the first explosion-proof valve through-hole <NUM>.

In another possible implementation, the hole wall <NUM> of the first explosion-proof valve through-hole <NUM> may have a surface with a variable slope. That the hole wall <NUM> of the first explosion-proof valve through-hole <NUM> has a surface with a variable slope means that the hole wall is a curved surface, and the change speed of the hole diameter of the first explosion-proof valve through-hole <NUM> gradually increases or decreases.

For example, referring to <FIG> is another possible schematic cross-sectional view of the top patch <NUM> shown in <FIG> on plane F-F. The change speed of the hole diameter of the first explosion-proof valve through-hole <NUM> gradually decreases, that is, the hole wall <NUM> of the first explosion-proof valve through-hole <NUM> protrudes away from a center line of the first explosion-proof valve through-hole <NUM>. Specifically, the first side wall <NUM>, the second side wall <NUM>, the third side wall <NUM>, and the fourth side wall <NUM> each may be a surface protruding toward the center line of the first explosion-proof valve through-hole <NUM>.

Alternatively, referring to <FIG> is yet another possible schematic cross-sectional view of the top patch <NUM> shown in <FIG> on plane F-F. The change speed of the hole diameter of the first explosion-proof valve through-hole <NUM> gradually decreases, that is, the hole wall <NUM> of the first explosion-proof valve through-hole <NUM> is recessed away from a center line of the first explosion-proof valve through-hole <NUM>. Specifically, the first side wall <NUM>, the second side wall <NUM>, the third side wall <NUM>, and the fourth side wall <NUM> each may be a surface recessed toward the center line of the first explosion-proof valve through-hole <NUM>.

It may be understood that, that the hole wall <NUM> of the first explosion-proof valve through-hole <NUM> has 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 to <FIG> and <FIG>, the connecting through-hole <NUM> may communicate the second terminal through-hole <NUM> with the first explosion-proof valve through-hole <NUM>. In direction Y, a length of the connecting through-hole <NUM> may be less than each of a length of the second terminal through-hole <NUM> in direction Y and a length of the first explosion-proof valve through-hole <NUM> in direction Y. In this way, on the basis of satisfying that the connecting through-hole <NUM> communicates the second terminal through-hole <NUM> with the first explosion-proof valve through-hole <NUM>, a structural area around the connecting through-hole <NUM> is increased as much as possible, so that the connecting through-hole <NUM> of the top patch <NUM> can effectively avoid an influence of structural strength due to an excessively thin structure of the top patch <NUM> while satisfying operating performance (such as exposing an identification <NUM> of the smooth aluminum sheet <NUM> described below). Certainly, in other embodiments, in direction Y, the length of the connecting through-hole <NUM> may be greater than each of the length of the second terminal through-hole <NUM> in direction Y and the length of the first explosion-proof valve through-hole <NUM> in direction Y. Alternatively, in direction Y, the length of the connecting through-hole <NUM>, the length of the second terminal through-hole <NUM>, and the length of the first explosion-proof valve through-hole <NUM> may 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 hole <NUM> is defined to communicate the second terminal through-hole <NUM> with the first explosion-proof valve through-hole <NUM>, so that to-be-removed offcuts in the top patch <NUM> may be large offcuts, which can not only keep structural integrity of the top patch <NUM>, 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 <NUM>, 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 hole <NUM> is defined to communicate the second terminal through-hole <NUM> with the first explosion-proof valve through-hole <NUM>, to avoid problems such as warpage of the top patch <NUM> and a difficulty in a subsequent mounting process of the top patch <NUM> due to deformation at a joint of each hole.

Furthermore, arrangement of the connecting through-hole <NUM> can reduce a volume of the top patch <NUM> occupied by configuring this portion as a physical structure, thereby saving a material of the top patch <NUM>. Since a weight of the top patch <NUM> is reduced, a weight of the whole energy-storage apparatus <NUM> is also reduced. In addition, since the connecting through-hole <NUM> communicates the second terminal through-hole <NUM> with the first explosion-proof valve through-hole <NUM>, only two pieces of offcuts (offcuts of the first terminal through-hole <NUM> and offcuts of a whole for connecting the second terminal through-hole <NUM>, the connecting through-hole <NUM>, and the first explosion-proof valve through-hole <NUM>) are present in the top patch <NUM> during actual preparation. Therefore, when the top patch <NUM> is mounted, a step of removing internal residual materials is relatively simple, which not only improves a molding yield of the top patch <NUM>, but also saves production time costs.

Referring to <FIG> and <FIG> is a schematic cross-sectional view of the top patch <NUM> shown in <FIG> on plane G-G. The hole wall <NUM> of the connecting through-hole <NUM> is obliquely arranged relative to the connecting surface <NUM>. In other words, a diameter of the connecting through-hole <NUM> gradually changes in a direction from the connecting surface <NUM> and away from the connecting surface <NUM>. For example, as shown in <FIG>, the hole diameter of the connecting through-hole <NUM> gradually increases in the direction from the connecting surface <NUM> and away from the connecting surface <NUM>.

It may be understood that, the second terminal through-hole <NUM>, the connecting through-hole <NUM>, and the first explosion-proof valve through-hole <NUM> form a communicated elongated hole. The elongated hole is defined after cutting the sheet of the top patch <NUM>. 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 patch <NUM>, thereby saving machining time costs of the top patch <NUM>.

An angle α4 at which the hole wall <NUM> of the connecting through-hole <NUM> is inclined relative to the connecting surface <NUM> ranges from <NUM> degrees to <NUM> degrees. It may be noted that, the angle α4 at which the hole wall <NUM> of the connecting through-hole <NUM> is inclined relative to the connecting surface <NUM> is a largest angle among angles between a tangent of any point of the connecting through-hole <NUM> and the connecting surface <NUM>. A surface of the hole wall <NUM> of the connecting through-hole <NUM> may be a flat surface with a fixed slope. Alternatively, the surface of the hole wall <NUM> of the connecting through-hole <NUM> may be a surface with a variable slope.

It may be understood that, when the angle α4 is within the foregoing range, the operator can more conveniently remove the offcuts in the connecting through-hole <NUM> from the top patch, and the removing effect is better, the top patch <NUM> 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 <NUM>.

Specifically, the connecting through-hole <NUM> includes a fifth side wall <NUM> and a sixth side wall <NUM> arranged opposite to each other in direction Y. As shown in <FIG>, both the fifth side wall <NUM> and the sixth side wall <NUM> may be arranged obliquely relative to the connecting surface <NUM>. The angle α4 between the connecting surface <NUM> and each of the fifth side wall <NUM> and the sixth side wall <NUM> ranges from <NUM> degrees to <NUM> degrees. On one hand, it is avoided that the angle α4 between the connecting surface <NUM> and each of the fifth side wall <NUM> and the sixth side wall <NUM> is 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 α4 between the connecting surface <NUM> and each of the fifth side wall <NUM> and the sixth side wall <NUM> is too small, that is, when the angle α4 between the connecting surface <NUM> and each of the fifth side wall <NUM> and the sixth side wall <NUM> approaches <NUM> degrees, an obliquely-cut inclined surface may not have an inward flange, which is inconvenient for removing the offcuts. The angle α4 between the connecting surface <NUM> and each of the fifth side wall <NUM> and the sixth side wall <NUM> 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, referring to <FIG>, the hole wall <NUM> of the connecting through-hole <NUM> may have a flat surface with a fixed slope. That the hole wall <NUM> of the connecting through-hole <NUM> has a flat surface with a fixed slope means that the hole wall <NUM> of the connecting through-hole <NUM> is in a shape of a side surface of a frustum, a hole diameter of the connecting through-hole <NUM> gradually increases or decreases, and a change speed remains unchanged. Specifically, the fifth side wall <NUM> and the sixth side wall <NUM> each may be a flat surface.

It may be understood that, when the hole wall <NUM> of the connecting through-hole <NUM> has 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 patch <NUM>.

In another possible implementation, the hole wall <NUM> of the connecting through-hole <NUM> may have a surface with a variable slope. That the hole wall <NUM> of the connecting through-hole <NUM> has a surface with a variable slope means that the hole wall is a curved surface, and the change speed of the hole diameter of the connecting through-hole <NUM> gradually increases or decreases.

For example, referring to <FIG> is another possible schematic cross-sectional view of the top patch <NUM> shown in <FIG> on plane E-E. The change speed of the hole diameter of the connecting through-hole <NUM> gradually increases, that is, the hole wall <NUM> of the connecting through-hole <NUM> protrudes toward a center line of the connecting through-hole <NUM>. Specifically, the fifth side wall <NUM> and the sixth side wall <NUM> may be surfaces protruding toward the center line of the first explosion-proof valve through-hole <NUM>.

Alternatively, referring to <FIG> is yet another possible schematic cross-sectional view of the top patch <NUM> shown in <FIG> on plane E-E. The change speed of the hole diameter of the connecting through-hole <NUM> gradually decreases, that is, the hole wall <NUM> of the connecting through-hole <NUM> is recessed away from a center line of the connecting through-hole <NUM>. Specifically, the fifth side wall <NUM> and the sixth side wall <NUM> each may be a surface recessed toward the center line of the first explosion-proof valve through-hole <NUM>.

It may be noted that, the hole wall of the first terminal through-hole <NUM>, the hole wall of the second terminal through-hole <NUM>, the hole wall of the first explosion-proof valve through-hole <NUM>, and the hole wall of the connecting through-hole <NUM> mentioned above each may be recessed or protruded toward the center line of the hole wall thereof. However, the structure of the top patch <NUM> provided in the present disclosure is not limited to the foregoing implementations, and the hole wall of the first terminal through-hole <NUM>, the hole wall of the second terminal through-hole <NUM>, the hole wall of the first explosion-proof valve through-hole <NUM>, and the hole wall of the connecting through-hole <NUM> each may include one or more of a surface protruding toward the center lines thereof, a surface recessed toward 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 wall <NUM> of the connecting through-hole <NUM> has 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 to <FIG> again, the fifth side wall <NUM> includes a fifth end <NUM> and a sixth end <NUM> arranged opposite to each other in direction X. The fifth end <NUM> is arranged toward the second terminal through-hole <NUM>, and the sixth end <NUM> is arranged toward the first explosion-proof valve through-hole <NUM>. The sixth side wall <NUM> includes a seventh end <NUM> and an eighth end <NUM> arranged opposite to each other in direction X. The seventh end <NUM> is arranged toward the second terminal through-hole <NUM>, and the eighth end <NUM> is arranged toward the first explosion-proof valve through-hole <NUM>.

In embodiments of the present disclosure, the hole wall <NUM> of the connecting through-hole <NUM> is connected to the hole wall <NUM> of the second terminal through-hole <NUM> through a first curved surface <NUM>. A radius of curvature of the first curved surface <NUM> ranges from <NUM> to <NUM> (including end point values of <NUM> and <NUM>). Specifically, the fifth end <NUM> of the fifth side wall <NUM> is connected to the hole wall <NUM> of the second terminal through-hole <NUM> through one first curved surface <NUM>. Specifically, the seventh end <NUM> of the sixth side wall <NUM> is connected to the hole wall <NUM> of the second terminal through-hole <NUM> through the other first curved surface <NUM>.

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

In embodiments of the present disclosure, the hole wall <NUM> of the connecting through-hole <NUM> is connected to the hole wall of the first explosion-proof valve through-hole <NUM> through a second curved surface <NUM>. A radius of curvature of the second curved surface <NUM> ranges from <NUM> to <NUM> (including end point values of <NUM> and <NUM>). Specifically, the sixth end <NUM> of the fifth side wall <NUM> is connected to one end of the first side wall <NUM> of the first explosion-proof valve through-hole <NUM> through one second curved surface <NUM>. The seventh end <NUM> of the sixth side wall <NUM> is connected to another end of the first side wall <NUM> of the first explosion-proof valve through-hole <NUM> through the other second curved surface <NUM>.

It may be understood that, the hole wall <NUM> of the first explosion-proof valve through-hole <NUM> of the top patch <NUM> is smoothly connected to the hole wall <NUM> of the connecting through-hole <NUM> of the top patch <NUM> through the second curved surface <NUM>, so that the inner edge of the top patch <NUM> does not have a relatively sharp angle, thereby avoiding an operation of accurately aligning the top patch <NUM> with the smooth aluminum sheet <NUM> at a sharp corner, and simplifying a coordination connection process between the top patch <NUM> and the smooth aluminum sheet <NUM>.

Referring to <FIG>, the connecting through-hole <NUM> may be an identification-through hole, and an identification <NUM> arranged on the first surface <NUM> of the smooth aluminum sheet <NUM> may be exposed beyond the identification through-hole. With such arrangement, the identification <NUM> at a position of the smooth aluminum sheet <NUM> corresponding to the connecting through-hole <NUM> may be exposed beyond the connecting through-hole <NUM>. In addition, since the top patch <NUM> and the negative electrode protrusion <NUM> are arranged around the identification <NUM>, and a position of the identification <NUM> is recessed relative to the top patch <NUM> and the negative electrode protrusion <NUM>, the position of the identification <NUM> is unlikely to be scratched by foreign objects and has good reliability.

Referring to <FIG> again, a distance between the hole wall <NUM> of the second terminal through-hole <NUM> and the outer edge of the top patch <NUM> in the width direction (that is, direction Y) of the smooth aluminum sheet <NUM> is a second distance L2. The second distance L2 is also a narrowest portion of a physical structure of the top patch <NUM>. The second distance L2 may range from <NUM> to <NUM> (including endpoint values of <NUM> and <NUM>). It may be noted that, the distance between the hole wall <NUM> of the second terminal through-hole <NUM> and the outer edge of the top patch <NUM> may be the same as or different from a distance between the first terminal through-hole <NUM> and the outer edge of the top patch <NUM>.

In a possible implementation, the second distance L2 is greater than the third distance L3. In other words, in the width direction (that is, direction Y) of the smooth aluminum sheet <NUM>, a width of the narrowest portion of the top patch <NUM> is greater than the width of the wrapping film <NUM> covering the portion of the first surface <NUM> of the smooth aluminum sheet <NUM>. With such arrangement, the top patch <NUM> can completely cover the edge of the wrapping film <NUM> on the first surface <NUM> of the smooth aluminum sheet <NUM>, so that after the top patch <NUM> is connected to the smooth aluminum sheet <NUM>, warpage of a portion of the edge of the wrapping film <NUM> on the surface of the smooth aluminum sheet <NUM> can be avoided.

For example, the second distance L2 may also be less than the first distance L1. In other words, in the width direction (that is, direction Y) of the smooth aluminum sheet <NUM>, the width of the narrowest portion of the top patch sheet <NUM> is less than a width between the positive electrode protrusion <NUM> and/or the negative electrode protrusion <NUM> of the smooth aluminum sheet <NUM> and the outer edge of the smooth aluminum sheet <NUM>. Therefore, after the top patch <NUM> is attached to the smooth aluminum sheet <NUM>, the top patch <NUM> may not fall off because the outer edge of the top patch <NUM> protrudes relative to the outer edge of the smooth aluminum sheet <NUM>.

Further, a difference between the first distance L1 and the second distance L2 may be greater than a difference between the second distance L2 and the third distance L3. In other words, in the width direction (that is, direction Y) of the smooth aluminum sheet <NUM>, a difference between the width of the narrowest portion of the top patch <NUM> and the distance between the protrusions (the positive electrode protrusion <NUM> and/or the negative electrode protrusion <NUM>) of the smooth aluminum sheet <NUM> and the outer edge of the smooth aluminum sheet <NUM> is greater than a difference between the width of the narrowest portion of the top patch <NUM> and a width of the wrapping film <NUM> on the first surface <NUM>.

In this way, the top patch <NUM> may completely cover the edge of the wrapping film <NUM> on the first surface <NUM>, and a portion of the top patch <NUM> may also be attached to the smooth aluminum sheet <NUM>, thereby better pressing the edge of the wrapping film <NUM> on the smooth aluminum sheet <NUM>.

Still referring to <FIG> and <FIG>, the top patch <NUM> includes a liquid-injection- hole sealing-portion <NUM>. The liquid-injection-hole sealing-portion <NUM> is between the first terminal through-hole <NUM> and the first explosion-proof valve through-hole <NUM>. The liquid-injection-hole sealing-portion <NUM> includes a sealing surface <NUM>, where the sealing surface <NUM> is part of a surface of the top patch <NUM> facing the smooth aluminum sheet <NUM>. The top patch <NUM> further includes an adhesive layer <NUM>. The adhesive layer <NUM> is arranged on the sealing surface <NUM>. The adhesive layer <NUM> is spaced apart from an edge of the first terminal through-hole <NUM>, an edge of the second terminal through-hole <NUM>, and an edge of the top patch <NUM>, to prevent an adhesive from overflowing to the liquid-injection-hole sealing-portion <NUM> and causing adverse effects on the operating performance of the energy-storage apparatus <NUM>. The liquid-injection-hole sealing-portion <NUM> is connected to the liquid-injection hole <NUM> through the adhesive layer <NUM>, so that the adhesive layer <NUM> seals the liquid-injection hole <NUM>.

It may be understood that, sealing performance of the liquid-injection hole <NUM> has a great influence on a service life and performance of the energy-storage apparatus <NUM>. 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 patch <NUM> of the present disclosure can seal the liquid-injection hole <NUM> of the smooth aluminum sheet <NUM> while connecting the top patch <NUM> to the smooth aluminum sheet <NUM> by arranging the adhesive layer <NUM> and enabling the adhesive layer <NUM> to seal the liquid-injection hole <NUM>, thereby reducing occurrence of electrolyte leakage and the like in the liquid-injection hole <NUM> of the energy-storage apparatus <NUM>.

In addition, since the liquid-injection-hole top-surface <NUM> is recessed relative to the smooth aluminum-sheet body <NUM>, and the adhesive layer <NUM> located on the sealing surface <NUM> of the top patch <NUM> is protruded relative to the surface of the top patch <NUM>, after the adhesive layer <NUM> is correspondingly connected to the liquid-injection hole <NUM>, at least part of the adhesive layer <NUM> can be accommodated in the liquid-injection hole <NUM>, so that the top patch <NUM> can be more flatly attached to the surface of the smooth aluminum sheet <NUM>, thereby improving flatness of installation of the top patch <NUM>.

Claim 1:
A top patch (<NUM>) configured to be attached to a smooth aluminum sheet (<NUM>) of an energy-storage apparatus (<NUM>), wherein the top patch (<NUM>) defines a first terminal through-hole (<NUM>) and a first hole (<NUM>) spaced apart from the first terminal through-hole (<NUM>) in a length direction of the top patch (<NUM>), the first hole (<NUM>) comprises two side walls (<NUM>) arranged opposite to each other in a width direction of the top patch (<NUM>), each of the two side walls (<NUM>) is provided with an extension bump (<NUM>), the first hole (<NUM>) at one side of the extension bump (<NUM>) forms a first explosion-proof valve through-hole (<NUM>), the first hole (<NUM>) at the other side of the extension bump (<NUM>) forms a second terminal through-hole (<NUM>), the top patch (<NUM>) further comprises a connecting surface (<NUM>) configured to be connected to the smooth aluminum sheet (<NUM>), each of a hole wall (<NUM>) of the first terminal through-hole (<NUM>), a hole wall (<NUM>) of the second terminal through-hole (<NUM>), and a hole wall (<NUM>) of the first explosion-proof valve through-hole (<NUM>) is arranged obliquely relative to the connecting surface (<NUM>), and an angle at which each of the hole wall (<NUM>) of the first terminal through-hole (<NUM>), the hole wall (<NUM>) of the second terminal through-hole (<NUM>), and the hole wall (<NUM>) of the first explosion-proof valve through-hole (<NUM>) is inclined relative to the connecting surface (<NUM>) ranges from <NUM> degrees to <NUM> degrees.