Battery Cell and Feed-Through Assembly

Abstract

This disclosure relates to the field of battery technology. The disclosed battery cell includes a case assembly, an electrode assembly, a conductive sheet, and a feed-through assembly. The feed-through assembly includes a first gasket and a rivet. The first gasket includes a first shim portion, a second shim portion, and a connecting portion and is housed in the case assembly. The second shim portion is provided on the outer surface of the case assembly, and the connecting portion connects the first shim portion and the second shim portion. The case has a through-hole through which the connecting portion passes. The rivet passes through the first shim portion, the connecting portion, and the second shim portion and presses them together to seal the through-hole. After the rivet is riveted and deformed, the clamping force on the first and second shim portions and the reaction force of the case assembly attach the first gasket and the rivet itself to the case assembly. This effectively avoids the adverse effect of significant changes in local stress due to thermal effects at the location of the case assembly corresponding to the feed-through assembly.

Description

[Technical field]

[0001] FIELD OF THE DISCLOSURE This application relates to the field of battery technology, and in particular to battery cells and feed-through assemblies. [Background technology]

[0002] A battery cell is a device that converts external energy into electrical energy, stores it therein, and supplies power to an external device (e.g., a portable electronic device) when needed. In general, a battery cell includes a case assembly and an electrode assembly provided in the case assembly, and the electrode assembly usually includes a positive electrode sheet and a negative electrode sheet that are alternately arranged and a separator provided between the positive electrode sheet and the negative electrode sheet to separate them. In general, the case assembly is a conductor, and one of the positive electrode sheet and the negative electrode sheet is electrically connected to the case assembly via a conductive element, and the other is indirectly electrically connected to a feed-through assembly that passes through the case assembly via a conductive sheet, and must be kept insulated from the case assembly to avoid short-circuiting the battery cell.

[0003] In conventional technology, the feed-through assembly is fixed to the case assembly by welding, but the thermal effects of the welding process cause significant changes in local stress at the location of the case assembly corresponding to the feed-through assembly, and further reduce the sealing performance of the battery cell. Summary of the Invention [Problem to be solved by the invention]

[0004] The present application aims to provide a battery cell and a feed-through assembly that solves the technical problem that in conventional battery cells, welding the feed-through assembly to the case assembly causes local stress at a location in the case assembly corresponding to the feed-through assembly to change significantly due to thermal effects. [Means for solving the problem]

[0005] In order to solve the above technical problems, the present application employs the following aspects.

[0006] The battery cell includes a case assembly, an electrode assembly, a conductive sheet electrically connected to the electrode assembly, and a feed-through assembly, where the electrode assembly and the conductive sheet are housed in the case assembly, and the feed-through assembly includes a first gasket, a second gasket, and a rivet.

[0007] The first gasket includes a first shim portion, a second shim portion, and a connection portion, the first gasket is housed in the case assembly, the second shim portion is provided on the outer surface of the case assembly, the connection portion connects the first shim portion and the second shim portion, and a through hole is provided in the case assembly for the connection portion to pass through.

[0008] The rivet includes a shaft portion, an end portion, and a stopper portion, the shaft portion is inserted through the first shim portion, the connection portion, and the second shim portion in this order, the end portion is provided at one end of the shaft portion housed in the case assembly, the stopper portion is provided at the other end of the shaft portion protruding from the case assembly, and the end portion and the stopper portion press the first shim portion and the second shim portion together to seal the through hole. The conductive sheet is electrically connected to the rivet.

[0009] As a further improved form of the above technical solution, the first shim portion, the second shim portion and the connection portion are integrally molded, and the first shim portion and the second shim portion have a plate-like structure.

[0010] As a further improved form of the above technical solution, the second shim portion is pushed out by the stopper portion, extends parallel to the connection portion, and is flanged so as to be disposed opposite to the first shim portion.

[0011] As a further improved form of the above technical solution, the stopper part is formed by compressive deformation during the riveting process of the rivet, and its end part has a plate-like structure.

[0012] As a further improved form of the technical solution, the battery cell further includes an insulating member, and the insulating member is disposed between the second shim portion and the stopper portion.

[0013] In a further improved form of the above technical solution, the insulating member is an annular gasket, and the annular gasket is fitted onto the shaft.

[0014] As a further improved form of the technical solution, the battery cell further includes a second gasket, and the second gasket is embedded between the end portion and the first shim portion.

[0015] As a further improvement of the above technical solution, the second gasket is provided with a receiving groove for receiving the end of the rivet, and at least a portion of the side wall of the end of the rivet and the groove wall of the receiving groove are in close contact with each other to prevent the end of the rivet from rotating relative to the second gasket.

[0016] As a further improved form of the above technical solution, the side wall of the end of the rivet includes two first side wall units arranged opposite each other, and the groove wall of the accommodating groove includes two second side wall units arranged opposite each other, and one first side wall unit corresponds to one second side wall unit and is in close contact with it.

[0017] As a further improvement of the above technical solution, at least a portion of the side wall of the second gasket is in intimate contact with the inner surface of the case assembly so as to prevent the second gasket from rotating around the rivet relative to the case assembly.

[0018] As a further improvement of the above technical solution, the second gasket is fixed to the case assembly.

[0019] As a further improved form of the technical solution, the battery cell further includes an insulating spacer, the insulating spacer being disposed between the end portion and the electrode assembly, the insulating spacer being provided with a through-slot, and the conductive sheet being inserted through the through-slot and electrically connected to the rivet.

[0020] In order to solve the above technical problems, the present application further adopts the following technical solutions.

[0021] The feed-through assembly includes a first gasket and a rivet, where the first gasket includes a first shim portion and a connecting portion, and the first shim portion is formed extending outward from one end of the connecting portion, and the rivet includes a shaft portion and an end portion, where the shaft portion is inserted through the first shim portion and the connecting portion in sequence, the end portion is provided at the first end of the shaft portion, and the second end of the shaft portion forms a stopper portion by compression during a riveting process, whereby the end portion and the stopper portion press against the first shim portion and one end of the connecting portion that is remote from the first shim portion, respectively, and further, the one end of the connecting portion that is remote from the first shim portion is flanged to a second shim portion disposed opposite the first shim portion.

[0022] As a further improved form of the technical solution, the feedthrough assembly further includes an insulating member, which is fitted onto the shaft portion.

[0023] As a further improvement to the above technical solution, the end of the rivet is fixed to one end of the shank near the first shim portion.

[0024] As a further improved form of the technical solution, the feedthrough assembly further includes a second gasket, the second gasket being embedded between the end portion and the first shim portion.

[0025] As a further improved form of the above technical solution, the second gasket is provided with a receiving groove for receiving the end of the rivet, and at least a portion of the side wall of the end of the rivet and the groove wall of the receiving groove are in close contact with each other to prevent the end of the rivet from rotating relative to the second gasket.

[0026] As a further improved form of the above technical solution, the side wall of the end of the rivet includes two first side wall units arranged opposite each other, and the groove wall of the accommodating groove includes two second side wall units arranged opposite each other, and one first side wall unit corresponds to one second side wall unit and is in close contact with it. Effect of the Invention

[0027] The beneficial effects of the present application are as follows:

[0028] A battery cell according to the present embodiment includes a case assembly, an electrode assembly, a conductive sheet, and a feed-through assembly. Here, the feed-through assembly includes a first gasket and a rivet. The first gasket includes a first shim portion, a second shim portion, and a connection portion. The first gasket is housed in the case assembly, the second shim portion is provided on the outer surface of the case assembly, and the connection portion connects the first shim portion and the second shim portion. Correspondingly, a through hole for inserting the connection portion is provided in the case assembly. The rivet is inserted through the first shim portion, the connection portion, and the second shim portion in order, and its end portion and the stopper portion are sealed in the through hole by pressing the first shim portion and the second shim portion against each other. The positive electrode sheet or the negative electrode sheet in the electrode assembly is electrically connected to the rivet via the conductive sheet, and the rivet is formed as an external terminal of the battery cell.

[0029] In the battery cell of the present embodiment, the feed-through assembly is not fixed to the case assembly by a thermal processing process such as welding, but rather, after riveting deformation by the rivet, the first gasket and the rivet itself are attached to the case assembly by the clamping force on the first shim portion and the second shim portion and the interactive force of the case assembly, thereby effectively avoiding the adverse effect of significant changes in local stress due to thermal effects at the location of the case assembly corresponding to the feed-through assembly, i.e., the sealing performance of the battery cell can be improved to a certain extent. [Brief description of the drawings]

[0030] In order to more clearly describe the technical solutions of the embodiments of the present application, the drawings necessary for describing the embodiments will be briefly described below. Obviously, the drawings described below are only a part of the embodiments of the present application, and those skilled in the art can obtain other drawings based on the configurations shown in these drawings without making inventive efforts.

[0031] [Figure 1] FIG. 1 is an exploded schematic diagram of a battery cell according to one embodiment of the present application.

[0032] [Diagram 2] FIG. 2 is a partial view of the schematic cross-sectional view of the battery cell in FIG. 1 after rotation.

[0033] [Diagram 3] FIG. 3 is a schematic three-dimensional view of the first gasket in FIG.

[0034] [Figure 4] FIG. 4 is a schematic cross-sectional view of the first gasket in FIG.

[0035] [Diagram 5] FIG. 5 is a schematic three-dimensional view of the rivet in FIG.

[0036] [Figure 6] FIG. 6 is a schematic three-dimensional view of the second gasket in FIG.

[0037] [Figure 7] FIG. 7 is an exploded schematic view of a feedthrough assembly according to one embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0038] In order to facilitate understanding of the present application, the present application will be described in detail below in combination with drawings and specific examples. It should be noted that when an element is described as being "fixed" / "rigidly connected" to another element, the element may be directly located on the other element, or there may be one or more intermediate elements between them. When an element is described as being "connected" to another element, the element may be directly connected to the other element, or there may be one or more intermediate elements between them. The terms "vertical", "horizontal", "left", "right", "inside", "outside" and similar expressions used in this specification are for explanatory purposes only.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. The terms used in the present specification are only for the purpose of describing specific examples and are not intended to limit the present specification. The term "and / or" used in the present specification includes any and all combinations of one or more associated items.

[0040] In addition, the technical features of different embodiments of the present application described below can be combined with each other unless they are inconsistent with each other.

[0041] In this specification, the term "attach" includes fixing or restricting an element or device to a specific position or location by welding, screwing, engaging, adhering, etc., and the element or device may remain immovable in the specific position or location or may move within a limited range. The element or device may be removable or non-removable after being fixed or restricted to the specific position or location. The embodiment of the present application is not limited.

[0042] 1 and 2, FIG. 1 shows an exploded schematic view of a battery cell 1 according to an embodiment of the present application, and FIG. 2 shows a partial view of a rotated cross-sectional schematic view of the battery cell 1. The battery cell 1 includes a case assembly 100, an electrode assembly 200, a conductive sheet 300, and a feed-through assembly 400. Here, an accommodating chamber 101 is installed inside the case assembly 100. The electrode assembly 200 and the conductive sheet 300 are both accommodated in the accommodating chamber 101 of the case assembly 100. The feed-through assembly 400 includes a first gasket 410 and a rivet 420. Also referring to FIG. 4, the first gasket 410 includes a first shim portion 411, a second shim portion 412, and a connection portion 413. The first shim portion 411 is accommodated in the accommodating chamber 101 of the case assembly 100. The second shim portion 412 is provided on the outer surface of the case assembly 100. The connection portion 413 connects the first shim portion 411 and the second shim portion 412. Corresponding to this, the case assembly 100 is provided with a through hole 102 through which the connection portion 413 is inserted. Further referring to FIG. 5 in combination, the rivet 420 includes a shaft portion 421, an end portion 422, and a stopper portion 423. The shaft portion 421 is inserted through the first shim portion 411, the connection portion 413, and the second shim portion 412 in this order. The end portion 422 is provided at one end of the shaft portion 421 that is accommodated in the case assembly 100. The stopper portion 423 is provided at the other end of the shaft portion 421 that protrudes from the case assembly 100. The end portion 422 and the stopper portion 423 jointly press the first shim portion 411 and the second shim portion 412 to seal the through hole 102. The conductive sheet 300 is electrically connected to the electrode assembly 200 and the rivet 420, respectively.

[0043] The case assembly 100 will be specifically described with reference to FIG. 1. The case assembly 100 has a flat rectangular parallelepiped shape as a whole, and includes a case 110 and a lid 120. Here, the case 110 has a box-like structure with one end open as a whole. The lid 120 is fixed to cover the open end of the case 110. The case 110, together with the lid 120, surrounds a storage chamber 101.

[0044] For the electrode assembly 200, please continue to refer to FIG. 1. The electrode assembly 200 is accommodated in the accommodation chamber 101 of the case assembly 100. The electrode assembly 200 includes a positive electrode sheet and a negative electrode sheet alternately arranged, and a separator arranged between the positive electrode sheet and the negative electrode sheet to separate the positive electrode sheet and the negative electrode sheet. The electrode assembly 200 is folded into a substantially rectangular parallelepiped shape so that it can be easily accommodated in the accommodation chamber 101. The electrode assembly 200 is a core member that charges and discharges the battery cell 1. One of the positive electrode sheet and the negative electrode sheet is electrically connected to the case assembly 100 via a conductive element (not shown), and the other is electrically connected to the feed-through assembly 400 via a conductive sheet 300, so that the feed-through assembly 400 is formed as an external terminal of the battery cell 1. The case assembly 100 is further filled with an electrolyte. The electrode assembly 200 is immersed in the electrolyte. The electrolyte provides an environment for the transmission of lithium ions, and embeds the lithium ions in the positive or negative electrode sheet in a timely manner, thereby realizing the charging and discharging process of the battery cell 1.

[0045] 1, the feedthrough assembly 400 includes a first gasket 410 and a rivet 420. For ease of understanding, the first gasket 410 and the rivet 420 will now be described in detail in turn.

[0046] Regarding the first gasket 410, with reference to FIG. 3 and FIG. 4, FIG. 3 shows a schematic three-dimensional view of the first gasket 410, and FIG. 4 shows a schematic cross-sectional view in one direction. When combined with other drawings, the first gasket 410 is an insulating member and has good elasticity. The first gasket 410 has an "E" shape as a whole, and includes a first shim part 411, a connection part 413, and a second shim part 412, which are connected in sequence. Here, the first shim part 411 has a flat plate-like structure and is formed by extending from one end of the connection part 413 to the outside. The first shim part 411 is accommodated in the case assembly 100 and is installed in close contact with the inner surface of the case assembly 100. The second shim part 412 also has a flat plate-like structure and is formed by extending from the other end of the connection part 413 to the outside. The second shim portion 412 is installed on the outer surface of the case assembly 100 and is disposed opposite the first shim portion 411. Both ends of the connection portion 413 are connected to the first shim portion 411 and the second shim portion 412 in a one-to-one correspondence, respectively. Correspondingly, the case assembly 100 is provided with a through hole 102 through which the connection portion 413 is inserted. In this embodiment, the first shim portion 411, the connection portion 413, and the second shim portion 412 are integrally molded, so that the first gasket 410 can be attached and detached at one time, improving the efficiency of attaching and detaching the first gasket 410. It is understood that in other embodiments of the present application, the first shim portion 411, the connection portion 413, and the second shim portion 412 may be molded independently of each other.

[0047] Specifically, the rivet 420 will be described with reference to FIG. 5, which shows a three-dimensional schematic diagram of the rivet 420. The rivet 420 has an "E" shape as a whole, and includes a shaft portion 421, and end portions 422 and stopper portions 423 provided at both ends of the shaft portion 421. Here, the shaft portion 421 has a columnar structure as a whole, and is inserted through the first shim portion 411, the connection portion 413, and the second shim portion 412 in order. Correspondingly, the first shim portion 411, the connection portion 413, and the second shim portion 412 are each provided with a hole structure through which the shaft portion 421 is inserted. In this embodiment, each hole structure has the same radial size and constitutes a columnar through-hole structure, but in other embodiments of the present application, the size of each hole structure may be slightly different. The end 422 is provided at one end of the shaft portion 421 accommodated in the accommodating chamber 101 of the case assembly 100, and is located on the side of the first shim portion 411 that is separated from the second shim portion 412. The end 422 is formed extending outward from the one end of the shaft portion 421 accommodated in the case assembly 100, and has a flat plate-like structure as a whole, and the cross-sectional contour of the end 422 is larger than the cross-sectional contour of the shaft portion 421. The conductive sheet 300 is electrically connected to the end 422. The stopper portion 423 is provided at the other end of the shaft portion 421 that protrudes from the case assembly 100, and is located on the side of the second shim portion 412 that is separated from the first shim portion 411. That is, the first gasket 410 is located between the end 422 and the stopper portion 423. The stopper portion 423 is formed by extending outward from the other end of the shaft portion 421 protruding from the case assembly 100, and has a cross-sectional contour that is slightly larger than that of the shaft portion 421. The end portion 422 and the stopper portion 423 jointly press the first shim portion 411 and the second shim portion 412 to seal the through-hole 102. In this embodiment, the stopper portion 423 is formed by being compressed and deformed in the riveting process of the rivet 420, but before the riveting process is performed, the shape of the stopper portion 423 matches the shape of the shaft portion 421, and both have a columnar structure.

[0048] Optionally, the second shim portion 412 in this embodiment is a hollow columnar structure extending parallel to the connection portion 413 before the riveting process of the rivet 420 is performed. The second shim portion 412 is compressed and deformed by the stopper portion 423 during the riveting process of the rivet 420, and is flanged to a state where it is disposed opposite to the first shim portion 411, and is in close contact with the outer surface of the case assembly 100.

[0049] In addition, in order to prevent the stopper portion 423 from breaking through the second shim portion 412 and contacting the case assembly 100 during the riveting process of the rivet 420, which may cause the battery cell 1 to be short-circuited, the feedthrough assembly 400 further includes an insulating member 430. Specifically, by combining FIG. 1 and FIG. 2, the insulating member 430 is installed between the second shim portion 412 and the stopper portion 423. The installation of the insulating member 430 can provide a gap between the stopper portion 423 and the second shim portion 412 without a direct pressing force, or there is a contact between the stopper portion 423 and the second shim portion 412, i.e., there is a direct pressing force between them, but the pressure of part of the stopper portion 423 is borne by the insulating member 430, so that the direct pressing force is reduced to a certain extent. This makes it possible to avoid or reduce the possibility that the second shim portion 412 will be broken through by the stopper portion 423, thereby improving the safety of the battery cell 1. Optionally, the insulating member 430 is an annular gasket that is fitted onto the shaft portion 421 and embedded between the second shim portion 412 and the stopper portion 423.

[0050] In some embodiments, the feedthrough assembly 400 further includes a second gasket 440. The second gasket 440 is an insulating member and is embedded between the end 422 of the rivet 420 and the first shim portion 411. Specifically, referring to FIG. 6, a schematic three-dimensional view of the second gasket 440 is shown in FIG. 6 in combination with other drawings. The second gasket 440 has a plate-like structure, and a through hole 441 is provided in the center thereof for the shaft portion 421 to pass through, and is fitted onto the shaft portion 421 through the through hole 441. A receiving groove 442 is provided on the side of the second gasket 440 away from the first shim portion 411, and the receiving groove 442 is for receiving the end 422 of the rivet. The provision of the accommodating groove 442 can prevent the end 422 from being exposed from the second gasket 440 and occupying too much space, while also preventing the side of the rivet 420 from contacting the case assembly 100 when the rivet accidentally rotates relative to the case assembly 100, and further preventing the risk of electrical contact between the end 422 and the case assembly 100.

[0051] Furthermore, in order to prevent the end 422 of the rivet 420 from rotating in the case assembly 100 and interfering with other members in the case assembly 100, such as the electrode assembly 200, the conductive element, and the conductive sheet, the second gasket 440 is fixed in the circumferential direction of the through hole of the case assembly 100, and the side wall of the end 422 is in close contact with at least a part of the side wall of the accommodation groove 442 so as to prevent the end 422 from rotating relative to the second gasket 440. Specifically, by combining FIG. 5 and FIG. 6 at the same time, the side wall of the end 422 includes two first side wall units 4221 arranged opposite to each other. The accommodation groove 442 extends in the longitudinal direction of the second gasket 440, and both ends thereof penetrate the second gasket 440. The groove wall of the receiving groove 442 includes two second side wall units 4421 arranged opposite to each other, and one of the first side wall units 4221 is in close contact with one of the second side wall units 4421. The second gasket 440 is fixed in the circumferential direction of the rivet 420. In combination with the fact that the second gasket 440 cannot rotate with respect to the case assembly 100, it can be seen that the rivet 420 cannot rotate with respect to the case assembly 100. It should be noted that in other embodiments of the present application, the shape of the end 422 of the rivet and the shape of the receiving groove 442 may be other shapes, as long as it is ensured that after the end 422 is received in the receiving groove 442, the side wall of the end 422 is in close contact with at least a part of the groove wall of the receiving groove 442 and the end 422 does not rotate with respect to the second gasket 440. For example, in some embodiments, the cross-sectional profile of the groove walls of receiving groove 442 is a closed polygon, the shape of end 422 matches receiving groove 442, and the side walls of end 422 fit snugly against the groove walls of the receiving groove.

[0052] There are various methods for fixing the second gasket 440 in the circumferential direction of the through hole 102 of the case assembly 100. For example, in some embodiments, at least a portion of the side wall of the second gasket 440 is in close contact with the inner surface of the case assembly 100 so as to prevent the second gasket 440 from rotating around the rivet 420 relative to the case assembly 100. Specifically, the side wall of the second gasket 440 includes two third side wall units 443 arranged opposite to each other, and when one third side wall unit 443 contacts the inner surface of the cover 120 and the other third side wall unit 443 contacts the inner surface of the case 110, the second gasket 440 is fixed in the circumferential direction of the through hole 102 and cannot rotate. At the same time, the second gasket 440 is fixed to the case assembly 100 along the axial direction of the rivet 420, and thus the second gasket 440 is fixed to the case assembly 100. Also for example, in another embodiment, second gasket 440 is secured directly to case assembly 100 .

[0053] Furthermore, in order to prevent a short circuit of the battery cell 1 caused by a physical contact between one pole piece of the electrode assembly 200 electrically connected to the case assembly 100 and the rivet 420, the battery cell 1 further includes an insulating spacer 500. Specifically, referring to FIG. 1 and FIG. 2, the insulating spacer 500 is fixed in the case assembly 100 and disposed between the end 422 of the rivet 420 and the electrode assembly 200, thereby isolating the rivet 420 from the electrode assembly 200. The insulating spacer 500 is provided with a through groove 501, which penetrates the insulating spacer 500 along the direction in which the electrode assembly 200 faces the rivet 420. One end of the conductive sheet 300 is electrically connected to one pole piece of the electrode assembly 200, and the other end of the conductive sheet 300 is inserted through the through groove 501 and electrically connected to the rivet 420.

[0054] The battery cell 1 according to the embodiment of the present application includes a case assembly 100, an electrode assembly 200, a conductive sheet 300, and a feed-through assembly 400. Here, the feed-through assembly 400 includes a first gasket 410 and a rivet 420. The first gasket 410 includes a first shim portion 411 housed in the case assembly 100, a second shim portion 412 provided on the outer surface of the case assembly 100, and a connection portion 413 connecting the first shim portion 411 and the second shim portion 412, and the case assembly 100 is provided with a through hole 102 through which the connection portion 413 is inserted. The rivet 420 is inserted through the first shim portion 411, the connection portion 413, and the second shim portion 412 in that order, and its end portion 422 and stopper portion 423 are used to press the first shim portion 411 and the second shim portion 412 together, thereby sealing the through hole 102. One of the positive electrode sheet or the negative electrode sheet in the electrode assembly 200 is electrically connected to the rivet 420 via the conductive sheet 300, and the rivet 420 is further formed as an external terminal of the battery cell 1.

[0055] Compared with battery cells currently available on the market, the battery cell 1 according to the embodiment of the present application does not fix the feedthrough assembly 400 to the case assembly 100 by a thermal processing process such as welding, but rather attaches the first gasket 410 and the rivet 420 themselves to the case assembly 100 by the clamping force on the first shim portion 411 and the second shim portion 412 and the interactive force with the case assembly 100 after riveting deformation by the rivet 420, thereby effectively avoiding the adverse effect of significant changes in local stress due to thermal effects at the location of the case assembly 100 corresponding to the feedthrough assembly 400. In other words, the battery cell 1 can improve the sealing performance of the battery cell to a certain extent.

[0056] Based on the same idea, the present application further provides a feedthrough assembly 400'. Specifically, referring to FIG. 7, FIG. 7 shows an exploded schematic view of the feedthrough assembly 400'. The structure of the feedthrough assembly 400' is basically the same as that of the feedthrough assembly 400 in the above embodiment. For convenience of explanation, hereinafter, the feedthrough assembly 400 in the above embodiment will be referred to as a first feedthrough assembly 400, and the feedthrough assembly 400' in this embodiment will be referred to as a second feedthrough assembly 400'.

[0057] Specifically, the second feedthrough assembly 400' includes a first gasket 410', a rivet 420', an insulating member 430', and a second gasket 440'. Here, the shape, structure, and positional relationship of the insulating member 430' and the second gasket 440' are similar to those of the insulating member 430 and the second gasket 440 in the first feedthrough assembly 400, respectively, and the above embodiment may be referred to for details, so that the description of the insulating member 430' and the second gasket 440' is omitted in this embodiment. The main differences between the second feedthrough assembly 400' and the first feedthrough assembly 400 are the first gasket 410' and the rivet 420', which are specifically described as follows.

[0058] The first gasket 410 in the first feedthrough assembly 400 includes a first shim portion 411, a second shim portion 412, and a connection portion 413. The rivet 420 includes a shaft portion 421, an end portion 422, and a stopper portion423.

[0059] The first gasket 410' in the second feedthrough assembly 400' includes a first shim portion 411' and a connecting portion 412', and the first shim portion 411' is formed extending outward from one end of the connecting portion 412'. The rivet 420' in the second feedthrough assembly 400' includes a shaft portion 421' and an end portion 422', and the shaft portion 421' is inserted through the first shim portion 411' and the connecting portion 412' in that order. The end portion 422' is provided at a first end of the shaft portion 421' and is formed extending outward from the first end of the shaft portion 421'. The second end of the shaft portion 421' forms a stopper portion (which may refer to the stopper portion 423 in the first feedthrough assembly) by compression in the riveting process, so that the end portion 422' and the stopper portion press the first shim portion 411' and one end of the connecting portion 412' away from the first shim portion 411', respectively, and further, the one end of the connecting portion 412' away from the first shim portion 411' is intended to be flanged to a second shim portion (which may refer to the second shim portion 412 in the first feedthrough assembly) disposed opposite the first shim portion 411'. In this embodiment, the end portion 422' is fixed to one end of the shaft portion 421' close to the first shim portion 411'. Of course, in other embodiments of the present application, the end portion 422' may be fixed to one end of the shaft portion 421' away from the first shim portion 411'.

[0060] The second feedthrough assembly 400' is applied to a battery cell, and the fixing method thereof is basically the same as that of the first feedthrough assembly 400. The second feedthrough assembly 400' is fixed to the case assembly by a riveting process using rivets 420', and does not need to be fixed to the case assembly by a thermal processing process such as welding. Therefore, the second feedthrough assembly 400' can effectively avoid the adverse effect of significant changes in local stress due to thermal effects at the portion of the case assembly corresponding to the feedthrough assembly.

[0061] It should be noted that the above examples are merely for illustrating the technical solutions of the present application, and are not intended to limit the present application. According to the concept of the present application, the technical features in the above examples or different examples may be combined, and the steps may be realized in any order, and there are many other variations in different aspects of the present application as described above, and for the sake of brevity and clarity, the details thereof are not provided. Although the present application has been described in detail with reference to the above examples, it is understood that those skilled in the art may modify the technical solutions described in each of the above embodiments or replace some of the technical features with equivalents, and these modifications or replacements do not cause the essence of the corresponding technical solutions to depart from the scope of the technical solutions of each of the examples of the present application.

Claims

1. a case assembly, an electrode assembly, a conductive sheet electrically connected to the electrode assembly, and a feed-through assembly, the electrode assembly and the conductive sheet being accommodated in the case assembly; The feedthrough assembly includes: a first gasket including a first shim portion, a second shim portion, and a connection portion, the first shim portion being accommodated in the case assembly, the second shim portion being provided on an outer surface of the case assembly, the connection portion connecting the first shim portion and the second shim portion, and a through hole through which the connection portion is inserted in the case assembly; a rivet including a shaft portion, an end portion, and a stopper portion, the shaft portion being inserted through the first shim portion, the connection portion, and the second shim portion in this order, the end portion being provided at one end of the shaft portion that is accommodated in the case assembly, the stopper portion being provided at the other end of the shaft portion that protrudes from the case assembly, the end portion and the stopper portion being a rivet that presses the first shim portion and the second shim portion together to seal the through hole; a second gasket fitted between the end portion and the first shim portion; the conductive sheet is electrically connected to the rivet; The first gasket is an insulating part. A battery cell comprising:

2. The first shim portion, the second shim portion, and the connection portion are integrally molded, and the first shim portion and the second shim portion have a plate-like structure. The battery cell according to claim 1 .

3. The insulating member may further include an insulating member provided between the second shim portion and the stopper portion. The battery cell according to claim 1 .

4. The insulating member is an annular gasket, and the annular gasket is fitted to the shaft portion. The battery cell according to claim 3 .

5. The stopper portion is formed by compressive deformation during the riveting process of the rivet, and the end portion has a plate-like structure. The battery cell according to claim 1 .

6. The second gasket is provided with an accommodation groove for accommodating the end portion, At least a portion of the side wall of the end portion and the groove wall of the receiving groove are in close contact with each other to prevent the end portion from rotating relative to the second gasket. The battery cell according to claim 1 .

7. The side wall of the end portion includes two first side wall units arranged opposite to each other, and the groove wall of the accommodation groove includes two second side wall units arranged opposite to each other, and one of the first side wall units is in close contact with one of the second side wall units. The battery cell according to claim 6 .

8. At least a portion of a side wall of the second gasket contacts an inner surface of the case assembly to prevent the second gasket from rotating about the rivet relative to the case assembly. The battery cell according to claim 1 .

9. the second gasket is secured to the case assembly; The battery cell according to claim 1 .

10. an insulating spacer disposed between the end and the electrode assembly; The insulating spacer is provided with a through groove, and the conductive sheet is electrically connected to the rivet through the through groove. The battery cell according to claim 1 .

11. a first gasket including a first shim portion and a connection portion, the first shim portion being formed by extending outward from a first end of the connection portion; a rivet including a shaft portion and an end portion, the shaft portion being for sequentially passing through the first shim portion and the connecting portion, the end portion being provided at a first end of the shaft portion, and a second end of the shaft portion being for forming a stopper portion by compression in a riveting process, the end portion and the stopper portion pressing against the first shim portion and one end of the connecting portion away from the first shim portion, so that the one end of the connecting portion away from the first shim portion is flanged to a second shim portion disposed opposite the first shim portion, and a second gasket fitted between the end portion and the first shim portion, The first gasket is an insulating part. A feedthrough assembly comprising:

12. The insulating member is further included, and the insulating member is fitted to the shaft portion. The feedthrough assembly of claim 11 .

13. The end portion is fixed to an end of the shaft portion proximate to the first shim portion. The feedthrough assembly of claim 11 .

14. The second gasket is provided with an accommodation groove for accommodating the end portion, At least a portion of the side wall of the end portion and the groove wall of the receiving groove are in close contact with each other to prevent the end portion from rotating relative to the second gasket. The feedthrough assembly of claim 11 .

15. The side wall of the end portion includes two first side wall units arranged opposite to each other, and the groove wall of the accommodation groove includes two second side wall units arranged opposite to each other, and one of the first side wall units is in close contact with one of the second side wall units.

15. The feedthrough assembly of claim 14.

Images