BATTERY UNIT AND FEEDTHROUGH ASSEMBLY

A battery unit includes a housing assembly, an electrode assembly, a conductive plate, and a feedthrough assembly. The feedthrough assembly includes a first washer, a second washer, a conductive terminal, and a rivet. The housing assembly is provided with an opening for accommodating the feedthrough assembly. The first washer and the second washer are respectively disposed on an outer surface and an inner surface of the housing assembly. The conductive terminal is disposed on a side of the second washer facing away from the first washer. The rivet passes through the first washer, the opening, the second washer, and the conductive terminal, is electrically connected to the conductive terminal, and compresses the first washer and the second washer to seal the opening.

TECHNICAL FIELD

This application relates to the field of battery technologies, and in particular, to a battery unit and a feedthrough assembly.

BACKGROUND

A battery unit is an apparatus that converts external energy into electric energy and stores the electric energy inside to supply power to an external device (for example, a portable electronic device) as required. Generally, the battery unit includes a housing assembly and an electrode assembly disposed in the housing assembly, where the electrode assembly generally includes a positive electrode plate and a negative electrode plate that are circularly and alternately arranged, and a separator disposed therebetween for separating the two. Generally, the housing assembly is a conductor. One of the positive electrode plate and the negative electrode plate is electrically connected to the housing assembly via a conductive element, and the other needs to be indirectly electrically connected to a feedthrough assembly passing through the housing assembly via a conductive plate, and remains insulated from the housing assembly to avoid short circuits of the battery unit.

In the prior art, the feedthrough assembly is fastened to the housing assembly by welding, but a thermal effect caused by welding leads to a great change on the local stress of a part of the housing assembly corresponding to the feedthrough assembly, thereby deteriorating the sealing performance of the battery unit.

SUMMARY

This application is intended to provide a battery unit and a feedthrough assembly, so as to resolve the technical issue of an existing battery unit that local stress of a part of a housing assembly corresponding to the feedthrough assembly is greatly changed due to a thermal effect caused by welding the feedthrough assembly to the housing assembly.

The following technical solution is adopted for this application to resolve the technical issue:

A battery unit includes a housing assembly, an electrode assembly, a conductive plate electrically connected to the electrode assembly, and a feedthrough assembly. The housing assembly accommodates the electrode assembly and the conductive plate, and the housing assembly is provided with an opening for mounting the feedthrough assembly.

The feedthrough assembly includes a first washer, a second washer, a conductive terminal, a rivet, and an insulation sleeve. The first washer is disposed on an outer surface of the housing assembly, and a second washer is disposed on an inner surface of the housing assembly and is disposed opposite to the first washer. The conductive terminal is accommodated in the housing assembly and is disposed on a side of the second washer facing away from the first washer. The rivet includes a shaft portion, an end portion, and a limiting portion, where the shaft portion sequentially passes through the first washer, the opening, the second washer, and the conductive terminal, the end portion is disposed at an end of the shaft portion extending out of the housing assembly, the limiting portion is accommodated in the housing assembly and is electrically connected to the conductive terminal, and the end portion and the limiting portion abut against the first washer and the second washer so as to seal the opening. The insulation sleeve fits around an outer wall of the shaft portion, so as to prevent contact between the shaft portion and the housing assembly. The conductive plate is electrically connected to the conductive terminal.

The first washer includes a washer body and an annular protrusion, the washer body is provided with a through hole for the rivet to pass through, and the annular protrusion is disposed on an end surface of the washer body and surrounds an end portion of the through hole.

In a further improvement solution of the foregoing technical solution, two end surfaces of the washer body are each provided with the annular protrusion.

In a further improvement solution of the foregoing technical solution, the limiting portion is formed through compression and deformation of the rivet during riveting.

In a further improvement solution of the foregoing technical solution, a side wall of the second washer is at least partially attached to the inner surface of the housing assembly, so as to prevent the second washer from rotating around the rivet relative to the housing assembly.

In a further improvement solution of the foregoing technical solution, the second washer is fastened to the housing assembly.

In a further improvement solution of the foregoing technical solution, the second washer is provided with an accommodation groove for accommodating at least part of the conductive terminal. A side wall of the conductive terminal and a groove wall of the accommodation groove are at least partially attached to each other, so as to prevent the conductive terminal from rotating relative to the second washer.

In a further improvement solution of the foregoing technical solution, the side wall of the conductive terminal includes two first side wall units disposed opposite to each other, the groove wall of the accommodation groove includes two second side wall units disposed opposite to each other, and one of the first side wall units is correspondingly attached to one of the second side wall units.

In a further improvement solution of the foregoing technical solution, the conductive terminal is provided with an accommodating groove for accommodating the limiting portion.

In a further improvement solution of the foregoing technical solution, a side wall of the limiting portion and a side wall of the accommodating groove are at least partially attached to each other, so as to prevent the rivet from rotating relative to the conductive terminal.

In a further improvement solution of the foregoing technical solution, the battery unit further includes an insulation partition, and the insulation partition is disposed between the limiting portion and the electrode assembly. The insulation partition is provided with a through groove, and the conductive plate passes through the through groove and is electrically connected to the rivet.

The following technical solution is further adopted for this application to resolve the technical issue:

A feedthrough assembly includes a first washer, a second washer, a conductive terminal, a rivet, and an insulation sleeve. The first washer is disposed opposite to the second washer. The conductive terminal is disposed on a side of the second washer facing away from the first washer. The rivet includes a shaft portion and an end portion, where the shaft portion sequentially passes through the first washer, the second washer, and the conductive terminal, the end portion is disposed at a first end of the shaft portion, a second end of the shaft portion is compressed during riveting to form a limiting portion, so that one of the end portion and the limiting portion is connected to the conductive terminal, and the end portion and the limiting portion abut against the first washer and the second washer. The insulation sleeve fits around the shaft portion.

The first washer includes a washer body and an annular protrusion, where the washer body is provided with a through hole for the rivet to pass through, and the annular protrusion is disposed on an end surface of the washer body and surrounds an end portion of the through hole.

In a further improvement solution of the foregoing technical solution, two end surfaces of the washer body are each provided with the annular protrusion.

In a further improvement solution of the foregoing technical solution, the end portion is disposed on a side of the first washer facing away from the second washer.

In a further improvement solution of the foregoing technical solution, the second washer is provided with an accommodation groove for accommodating at least part of the conductive terminal. A side wall of the conductive terminal and a groove wall of the accommodation groove are at least partially attached to each other, so as to prevent the conductive terminal from rotating relative to the second washer.

In a further improvement solution of the foregoing technical solution, the side wall of the conductive terminal includes two first side wall units disposed opposite to each other, the groove wall of the accommodation groove includes two second side wall units disposed opposite to each other, and one of the first side wall units is correspondingly attached to one of the second side wall units.

In a further improvement solution of the foregoing technical solution, the conductive terminal is provided with a via hole for the shaft portion to pass through, and a side of the conductive terminal facing away from the second washer is provided with an accommodating groove in communication with the via hole.

This application has the following beneficial effects:

The battery unit provided in the embodiments of this application includes the housing assembly, the electrode assembly, the conductive plate, and the feedthrough assembly. The feedthrough assembly includes the first washer, the second washer, the conductive terminal, and the rivet. The housing assembly is provided with the opening for mounting the feedthrough assembly, the first washer is disposed on the outer surface of the housing assembly, and the second washer is disposed on the inner surface of the housing assembly. The conductive terminal is accommodated in the housing assembly and is disposed on the side of the second washer facing away from the first washer. The rivet sequentially passes through the first washer, the opening, the second washer, and the conductive terminal, and is electrically connected to the conductive terminal, and the rivet further abuts against the first washer and the second washer to seal the foregoing opening. A positive electrode plate or negative electrode plate in the electrode assembly is electrically connected to the conductive terminal via the conductive plate, so as to make the rivet be an external terminal of the battery unit.

In the battery unit provided in the embodiments of this application, the feedthrough assembly is not fastened onto the housing assembly through thermal processing processes such as welding, but the first washer, the second washer, the conductive terminal, and the rivet are mounted to the housing assembly through clamping force applied by the rivet to the first washer, the second washer, and the conductive terminal after the rivet is riveted and deformed and interaction force generated by the housing assembly. This can effectively avoid a great change on the local stress of a part of the housing assembly corresponding to the feedthrough assembly caused by a thermal effect, meaning that the sealing performance of the battery unit can be improved to some extent.

DETAILED DESCRIPTION

For ease of understanding this application, the following further describes this application in detail with reference to the accompanying drawings and specific embodiments. It should be noted that when a component is referred to as being “fastened to” or “fixedly connected to” another component, it may be directly fixed to the another component, or there may be one or more components in between. When a component is deemed as being “connected to” another component, it may be directly connected to the another component, or there may be one or more components in between. The terms “vertical”, “horizontal”, “left”, “right”, “inside”, “outside”, and similar expressions used in this specification are merely for description purposes.

Unless otherwise defined, all technical and scientific terms used herein shall have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are merely intended to describe specific embodiments but not to constitute any limitations on this application. The term “and/or” used herein includes any and all combinations of one or more associated items that are listed.

In addition, technical features involved in different embodiments of this application that are described below may be combined as long as they do not conflict with each other.

In this specification, “mounting” includes fastening or limiting an element or apparatus to a specific location or place by means of welding, screwing, clamping, bonding, or the like. The element or apparatus may stay still at the specific position or place, or may move within a limited range. After being fastened or limited to the specific position or place, the element or apparatus can be disassembled or cannot be disassembled. This is not limited in the embodiments of this application.

Referring toFIG.1andFIG.2,FIG.1andFIG.2respectively show a schematic exploded view of a battery unit1according to an embodiment of this application, and a partial view of a rotary cross-sectional schematic diagram of the battery unit1. The battery unit1includes a housing assembly100, an electrode assembly200, a conductive plate300, and a feedthrough assembly400. The housing assembly100is provided with an accommodating cavity101for accommodating the electrode assembly200and the conductive plate300inside, and the housing assembly100is further provided with an opening102in communication with the accommodating cavity101and configured for mounting the feedthrough assembly400. The feedthrough assembly400includes a first washer410, a second washer420, a conductive terminal430, a rivet440, and an insulation sleeve450. The first washer410is disposed on an outer surface of the housing assembly100, and a second washer420is disposed on an inner surface of the housing assembly100and is disposed opposite to the first washer410. The conductive terminal430is accommodated in the accommodating cavity101of the housing assembly100and is disposed on a side of the second washer420facing away from the first washer410. Referring toFIG.7, the rivet440includes a shaft portion441, an end portion442, and a limiting portion443, where the shaft portion441sequentially passes through the first washer410, the opening102, the second washer420, and the conductive terminal430, the end portion442is disposed at an end of the shaft portion441extending out of the housing assembly100, and the limiting portion443is provided at an end of the shaft portion441that is accommodated in the housing assembly100and is electrically connected to the conductive terminal430. The end portion442and the limiting portion443abut against the first washer410and the second washer420so as to seal the opening102. The insulation sleeve450fits around an outer wall of the shaft portion441, so as to prevent contact between the shaft portion441and the housing assembly100.

For the housing assembly100, specifically referring toFIG.1, according to an embodiment of this application, the housing assembly100is of a flat rectangular shape as a whole and includes a housing110and a cover120. The housing110is a box-shaped structure with an open end as a whole, the cover120covers and is fastened to the open end of the housing110, and the housing110and the cover120together enclose the accommodating cavity101. In addition, the housing110is further provided with the opening102for accommodating the feedthrough assembly400, and the opening102is in communication with the accommodating cavity101. According to another embodiment of this application, the housing assembly100may be of a non-flat rectangular shape or a cylindrical shape, or may be another three-dimensional structure composed of a bottom, a wall, and a cover.

For the electrode assembly200, still referring toFIG.1, the electrode assembly200is accommodated in the accommodating cavity101of the housing assembly100and includes a positive electrode plate and a negative electrode plate that are alternately arranged, and a separator disposed therebetween for separating the two. The electrode assembly200is of an approximately rectangular shape, so as to be accommodated in the accommodating cavity101. The electrode assembly200is a core component for charging and discharging the battery unit1. One of the positive electrode plate and the negative electrode plate is electrically connected to the housing assembly100via a conductive element not shown here, and the other is electrically connected to the feedthrough assembly400via the conductive plate300, so as to make the feedthrough assembly400be an external terminal of the battery unit1. The housing assembly100is further filled with an electrolyte, the electrode assembly200is soaked in the electrolyte, and the electrolyte is configured to provide an environment for lithium ion conduction, so that lithium ions can intercalate into the positive electrode plate or the negative electrode plate, thereby implementing a charge and discharge process of the battery unit1.

For the feedthrough assembly400, referring toFIG.1, the feedthrough assembly400specifically includes the first washer410, the second washer420, the conductive terminal430, the rivet440, and the insulation sleeve450, and specific structures of the foregoing components are described below in detail.

For the foregoing first washer410and the second washer420, referring toFIG.3toFIG.5,FIG.3toFIG.5respectively show a stereoscopic schematic diagram of the first washer410, a schematic cross-sectional diagram of the first washer410, and a stereoscopic schematic diagram of the second washer420. In addition, as combined with other accompanying drawings, both the first washer410and the second washer420are insulators and have good elasticity. The first washer410is a plate structure as a whole, is disposed on the outer surface of the housing assembly100, and is disposed corresponding to the opening102; and the first washer410is provided with a through hole4111in communication with the opening102for the rivet440to pass through. The second washer420is also a plate structure as a whole, is closely attached to the inner surface of the housing assembly100, and is disposed opposite to the first washer410. The second washer420is provided with a via hole421in communication with the opening102for the rivet440to pass through.

Preferably, to prevent the second washer420from rotating around the rivet440relative to the housing assembly100and further interfering with other elements in the housing assembly100or causing other accidents, the second washer420is fastened relative to a circumference of the opening102, meaning that the second washer420does not rotate around the rivet440. In this embodiment, a side wall of the second washer420is at least partially attached to the inner surface of the housing assembly100so as to prevent the second washer420from rotating around the rivet440relative to the housing assembly100. Specifically, the side wall of the second washer420includes two positioning wall surfaces422disposed opposite to each other, one of the positioning wall surfaces422is in contact with an inner surface of the cover120, and the other is in contact with an inner surface of the housing110, so that the second washer420is fastened relative to the circumference the opening102and cannot rotate. In addition, under compression action of the rivet440, the second washer420is fastened in an axial direction of the rivet440relative to the housing assembly100, meaning that the second washer420is fastened relative to the housing assembly100. It can be understood that in another embodiment of this application, the second washer420may further be directly fastened to the housing assembly100by means of bonding, screwing, or the like, so as to achieve the foregoing objective.

For the foregoing conductive terminal430, referring toFIG.6,FIG.6is a stereoscopic schematic diagram of the conductive terminal430in a direction, and as combined with other accompanying drawings, the side of the second washer420facing away from the first washer410is provided with an accommodation groove423, and the conductive terminal430is partially accommodated in the accommodation groove423and is electrically connected to an end of the conductive plate300farther away from the electrode assembly200. The conductive terminal430is a flat plate structure as a whole and is provided with a via hole431for the rivet440to pass through. The provision of the accommodation groove423can avoid excessive space occupied by the conductive terminal430being exposed outside the second washer420, and can also avoid contact between a side surface of the conductive terminal430and the housing assembly100caused by the conductive terminal430rotating accidentally around the rivet440relative to the housing assembly100to some extent, so as to reduce a safety hazard of electric contact between the conductive terminal430and the housing assembly100.

Further, to prevent the conductive terminal430from causing interference to other components in the housing assembly100, such as the conductive plate300caused by the conductive terminal430rotating in the housing assembly100, a side wall of the conductive terminal430and a side wall of the accommodation groove423are at least partially attached to each other, so as to prevent the conductive terminal430from rotating relative to the second washer420. Specifically, referring toFIG.5andFIG.6, the side wall of the conductive terminal430includes two first side wall units432disposed opposite to each other; the accommodation groove423extends in a length direction of the second washer420, where two ends of the accommodation groove423respectively pass through the second washer420; and the groove wall of the accommodation groove423includes two second side wall units4231disposed opposite to each other, and one of the first side wall units432is correspondingly attached to one of the second side wall units4231. The conductive terminal430is fastened relative to a circumference of the rivet440, and cannot rotate relative to the second washer420and the housing assembly100. In addition, the conductive terminal430is fastened in an axial direction of the rivet440under the action of the rivet440, meaning that the conductive terminal430is fastened relative to the housing assembly100. It can be understood that in another embodiment of this application, a shape of the conductive terminal430and a shape of the accommodation groove423may also be other shapes, provided that in a case that the conductive terminal430is accommodated or at least partially accommodated in the accommodation groove423, the side wall of the conductive terminal430and the groove wall of the accommodation groove423are at least partially attached to each other, and the conductive terminal430does not rotate relative to the second washer420. For example, in some embodiments, a cross-sectional contour of the groove wall of the accommodation groove423is a closed polygon, the shape of the conductive terminal430fits with that of the accommodation groove423, and the side wall of the conductive terminal430is entirely attached to the groove wall of the accommodation groove423.

For the foregoing rivet440, referring toFIG.7,FIG.7is a stereoscopic schematic diagram of the rivet440, where the rivet440is of an H-shape as a whole and includes the shaft portion441, the end portion442, and the limiting portion443. The shaft portion441is a columnar mechanism and sequentially passes through the first washer410, the opening102, the second washer420, and the conductive terminal430, and the insulation sleeve450fits around the outer wall of the shaft portion441, so as to prevent contact between the shaft portion441and the housing assembly100. The end portion442is formed by extending outward from one end of the shaft portion441that extends out of the housing assembly100and is a flat plate structure as a whole, where a cross-sectional contour of the end portion442is larger than a cross-sectional contour of the shaft portion441. The limiting portion443is formed by an end of the shaft portion441that is accommodated in the housing assembly100and extends outward, with a cross-sectional contour slightly larger than the cross-sectional contour of the shaft portion441. The first washer410, the second washer420, and the conductive terminal430are all located between the end portion442and the limiting portion443, where the end portion442abuts against the first washer410, the limiting portion443abuts against and is electrically connected to the conductive terminal430, and the end portion442cooperates with the limiting portion443to abut against the first washer410and the second washer420to seal the opening102. Preferably, an end of the conductive terminal430facing the limiting portion443is provided with an accommodating groove (not shown in the figure) that is in communication with the via hole431and is configured to accommodate the limiting portion443, so as to prevent the limiting portion443from protruding out of the conductive terminal430, or reduce height of the limiting portion443protruding from the conductive terminal430. Preferably, the side wall of the limiting portion443and a side wall of the accommodating groove are at least partially attached to each other, so as to prevent the rivet440from rotating relative to the conductive terminal430. For example, in some embodiments, the side wall of the limiting portion443includes two first limiting wall surfaces disposed opposite to each other, and correspondingly, a groove wall of the accommodating groove includes two second limiting wall surfaces disposed opposite to each other, and one of the first limiting wall surfaces is correspondingly attached to one of the second limiting wall surfaces. It is worth mentioning that in this embodiment, the limiting portion443is formed through compression and deformation of the rivet440during riveting, and a shape of the accommodating groove may guide a shape of the limiting portion443that is formed by deformation; and before riveting, a shape of the limiting portion443is the same as that of the shaft portion441, both of which are columnar structures.

Further, to improve a sealing effect when the rivet440abuts against the first washer410, in this embodiment, the first washer410includes a washer body411and an annular protrusion412. Specifically, still referring toFIG.3andFIG.4, as combined with other accompanying drawings, the washer body411is a flat plate structure as a whole, is disposed corresponding to the opening102, and is provided with the through hole4111. The annular protrusion412is a closed annulation and is disposed on an end surface of the washer body411. According to an embodiment of this application, the annular protrusion412may be annularly disposed at an edge of an end portion of the through hole4111; according to another embodiment of this application, the annular protrusion412may be annularly disposed at any middle position of an end surface of the washer body411; and according to still another embodiment of this application, the annular protrusion412may be an irregular annulation and is disposed on the end surface of the washer body411in a closed-annulation manner. The annular protrusion412protrudes out of the end surface of the washer body411, so that the squeezing force applied on the annular protrusion412is greater than that of other positions of the end surface of the washer body411when the rivet440abuts against the first washer410, and a better sealing effect thereof is implemented with respect to the other positions of the end surface. Optionally, two end surfaces of the washer body411are each provided with the annular protrusion412. It should be noted that the “end surface” in this paragraph refers to a surface of the washer body411that is perpendicular to an extension direction of the shaft portion441of the rivet, which may refer to a surface of a side of the washer body411facing the housing assembly100, or may refer to a surface of a side of the washer body411facing away from the housing assembly100.

Further, to avoid a short circuit of the battery unit1caused by physical contact between an electrode plate of the electrode assembly200that is electrically connected to the housing assembly100and the rivet440, the battery unit1further includes an insulation partition500. Specifically, referring toFIG.1andFIG.2, the insulation partition500is accommodated in the housing assembly100and is disposed between the limiting portion443of the rivet440and the electrode assembly200for separating the rivet440and the electrode assembly200. The insulation partition500is provided with a through groove501, and the through groove501runs through the insulation partition500in the direction of the electrode assembly200toward the rivet440. One end of the foregoing conductive plate300is electrically connected to an electrode plate of the electrode assembly200, and another end thereof passes through the through groove501and is electrically connected to the rivet440.

The battery unit1provided in some embodiments of this application includes the housing assembly100, the electrode assembly200, the conductive plate300, and the feedthrough assembly400. The feedthrough assembly400includes the first washer410, the second washer420, the conductive terminal430, the rivet440, and the insulation sleeve450. The first washer410is disposed on the outer surface of the housing assembly100, and the second washer420is disposed on the inner surface of the housing assembly100and is disposed opposite to the first washer410. The conductive terminal430is accommodated in the accommodating cavity101of the housing assembly100and is disposed on the side of the second washer420facing away from the first washer410. The shaft portion441of the rivet440sequentially passes through the first washer410, the opening102, the second washer420, and the conductive terminal430, the end portion442of the rivet440is disposed at the end of the shaft portion441extending out of the housing assembly100, and the limiting portion443of the rivet440is provided at the end of the shaft portion that is accommodated in the housing assembly100and is electrically connected to the conductive terminal430. The end portion442and the limiting portion443abut against the first washer410and the second washer420so as to seal the opening102. The insulation sleeve450fits around the outer wall of the shaft portion441, so as to prevent contact between the shaft portion441and the housing assembly100. In addition, one of the positive electrode plate or the negative electrode plate in the electrode assembly200is electrically connected to the conductive terminal430via the conductive plate300, so as to make the rivet440be an external terminal of the battery unit1.

As compared with a battery unit in the existing market, in the battery unit1provided in some embodiments of this application, the feedthrough assembly400is not fastened onto the housing assembly100through thermal processing processes such as welding, but the first washer410, the second washer420, the conductive terminal430, and the rivet440are mounted to the housing assembly100through clamping force applied by the rivet440to the first washer410, the second washer420, and the conductive terminal430after the rivet440is riveted and deformed and interaction force generated by the housing assembly100. This can effectively avoid a great change on the local stress of a part of the housing assembly100corresponding to the feedthrough assembly400caused by a thermal effect, meaning that the sealing performance of the battery unit1can be improved to some extent.

Based on the same inventive concept, this application further provides a feedthrough assembly400′. Referring toFIG.8,FIG.8is a schematic exploded view of the feedthrough assembly400′. Referring toFIG.1toFIG.7, the feedthrough assembly400′ and the feedthrough assembly400in the foregoing embodiment have a same structure. For ease of description, the feedthrough assembly400in the foregoing embodiment is referred to as a first feedthrough assembly400, and the feedthrough assembly400′ in this embodiment is referred to as a second feedthrough assembly400′ as below.

Specifically, the second feedthrough assembly400′ includes a first washer410′, a second washer420′, a conductive terminal430′, a rivet440′, and an insulation sleeve450′. The first washer410′, the second washer420′, the conductive terminal430′, and the insulation sleeve450′ respectively have a corresponding same shape, structure, and positional relationship as the first washer410, the second washer420, the conductive terminal430, and the insulation sleeve450in the first feedthrough assembly400. For details, reference may be made to some foregoing embodiments. The first washer410′, the second washer420′, the conductive terminal430′, and the insulation sleeve450′ in this embodiment are not described herein again. A main difference between the second feedthrough assembly400′ and the first feedthrough assembly400lies in the rivet440′, specifically as follows:

The rivet440in the first feedthrough assembly400includes the shaft portion441, the end portion442, and the limiting portion443.

The rivet440′ in the second feedthrough assembly400′ includes a shaft portion441′ and an end portion442′, and the shaft portion441′ sequentially passes through the first washer410′, the second washer420′, and the conductive terminal430′. The end portion442′ is disposed at a first end of the shaft portion441′ and is formed by the first end of the shaft portion441′ extending outward. A second end of the shaft portion441′ is compressed during riveting to form a limiting portion (with reference to the limiting portion443in the first feedthrough assembly), so that one of the end portion442′ and such limiting portion is connected to the conductive terminal430′, and the end portion442′ and the limiting portion abut against the first washer410′ and the second washer420′. In this embodiment, the end portion442′ is fastened to an end of the shaft portion441′ that is closer to the first washer410′, that is, a side of the first washer410′ facing away from the second washer420′. Certainly, in another embodiment of this application, the end portion442′ may alternatively be fastened to an end of the shaft portion441′ farther away from the first washer410′.

The second feedthrough assembly400′ may be applied to the battery unit and has a fastening manner substantially the same as that of the first feedthrough assembly400. The second feedthrough assembly400′ can be fastened to the housing assembly through riveting of the rivet440′ rather than thermal processing processes such as welding, so that the second feedthrough assembly400′ can effectively avoid a great change on the local stress of a part of the housing assembly corresponding to the feedthrough assembly caused by a thermal effect.

Finally, it should be noted that the foregoing embodiments are merely intended to describe the technical solutions of this application, and are not intended to limit this application. Under the idea of this application, the foregoing embodiments or the technical features in different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of this application as described above, which, for the sake of brevity, are not provided in detail. Although this application is described in detail with reference to the foregoing embodiments, persons of ordinary skill in the art should understand that modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some technical features therein, and these modifications or substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of this application.