Cell and Battery Pack

Abstract

The present invention relates to the technical field of batteries, and in particular to a battery cell and a battery pack. The battery cell includes: a connection terminal; an end of the electrode group is formed with an outwardly protruding tab; an insulating member is disposed between the electrode group and the connection terminal; a first mounting hole is formed in the insulating member, and the tab passes through the first mounting hole to be connected to the connection terminal; a housing One side of the insulating member facing away from the electrode group abuts against one side of the housing facing the inside of the battery cell. In the present invention, the tab of the electrode group first passes through the first mounting hole in the insulating member and then is connected to the connection terminal, so that the connection terminal does not have to extend below the insulating member, thus reducing the installation space reserved for assembly in the housing, thereby improving the utilization rate of the internal space of the battery cell, increasing the capacity of the battery cell, and further increasing the energy density of the battery pack to meet the user's needs.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular, to a battery cell and a battery pack. Background Art

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the use performance and safety of lithium-ion batteries are increasing day by day. A lithium-ion power battery generally includes an internal battery structure and an external battery structure. The internal battery structure mainly includes a battery cell electrode group, and the external battery structure mainly includes a battery cell cover plate and a battery cell housing. The battery cell housing provides a containing space for the battery cell electrode group, and the electrode group is fixed inside by welding and sealing the cover plate and the housing, thereby forming a complete lithium-ion battery structure.

[0003] Currently, in the traditional battery structure, the electrode group and the cover plate are assembled and welded and then installed in the housing together, and finally the housing and the cover plate are welded and sealed. Affected by the assembly process, the reserved space between the electrode group and the cover plate is too high, resulting in ineffective utilization of the internal space of the battery cell and loss of capacity utilization rate. In addition, since the housing is formed by stamping and stretching, there are rounded corners at the bottom and edges, and there is a risk of interference at the rounded corners of the bottom of the housing when the electrode group is installed in the housing, which may cause the electrode sheets in the electrode group to be damaged and fall off, affecting the safety of the battery cell. Summary of the Invention

[0004] In view of this, the purpose of the present application is to provide a battery cell and a battery pack to solve the problem that the reserved space between the existing battery cell electrode group and the cover plate is too high, resulting in ineffective utilization of the internal space of the battery cell and loss of capacity utilization rate.

[0005] The first aspect of the present invention provides a battery cell, wherein the battery cell includes:

[0006] A connection terminal;

[0007] An electrode group, with an outwardly protruding tab formed at an end thereof;

[0008] An insulating member disposed between the electrode group and the connection terminal; a first mounting hole is formed in the insulating member, and the tab passes through the first mounting hole to be connected to the connection terminal;

[0009] A housing, one side of the insulating member facing away from the electrode group abuts against one side of the housing facing the inside of the battery cell.

[0010] Preferably, a second mounting hole is formed in the housing, and a protruding limiting portion is formed on the inner wall of the second mounting hole, and the connection terminal is disposed on a side of the limiting portion facing away from the inside of the battery cell.

[0011] Preferably, the second mounting hole is formed with an extension protruding outward from the outside of the battery cell, and the extension surrounds the side wall of the connection terminal in the circumferential direction.

[0012] Preferably, a protruding stepped portion is formed on the side wall of the connection terminal, and one end of the extension away from the limiting portion is bent toward the connection terminal to form a flanging portion that is crimped with the connection terminal, so that the stepped portion is clamped between the limiting portion and the flanging portion.

[0013] Preferably, in the first direction, the size of the flanging portion is t, and 0.5 mm ≤ t ≤ 5 mm; in the second direction, the size of the flanging portion is w, and w ≥ 0.6 mm.

[0014] Preferably, the connection terminal includes:

[0015] A pole column, the pole ear is connected to the bottom of the pole column; in the second direction, the distance between the end of the flanging portion and the side wall of the stepped portion on the pole column in the circumferential direction is e, and e ≥ 0.2 mm, w - e ≥ 0.4 mm;

[0016] A covering member, formed as a ring structure covering the side wall of the pole column in the circumferential direction, and the covering member is made of an insulating material; in the first direction, the thickness dimension of the covering member located between the stepped portion and the flanging portion is a, and a ≥ 0.4 mm; in the first direction, the thickness dimension of the covering member located between the stepped portion and the limiting portion is b, and b ≥ 0.4 mm.

[0017] Preferably, the battery cell further includes:

[0018] A connecting member, disposed between the pole column and the pole ear.

[0019] Preferably, the housing includes:

[0020] A housing, formed with a receiving cavity, and the pole group and the insulating member are disposed in the receiving cavity;

[0021] A cover plate, connected to the housing;

[0022] The second mounting hole is opened in the housing or the cover plate.

[0023] Preferably, the battery cell further includes:

[0024] A sealing member, clamped between the connection terminal and the limiting portion.

[0025] The second aspect of the present invention provides a battery pack, including the battery cell according to any one of the above technical solutions.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] For the battery cell of the present invention, the assembly is simple. The insulating member is arranged between the electrode group and the device connection terminal. One side of the insulating member facing away from the electrode group abuts against one side of the housing facing the inside of the battery cell. A first mounting hole is provided on the insulating member, and the tab passes through the first mounting hole and is connected to the connection terminal, so that the connection terminal does not need to extend below the insulating member. In this way, the installation space reserved for assembly in the housing is reduced, thereby improving the utilization rate of the internal space of the battery cell, increasing the capacity of the battery cell, and further enhancing the energy density of the battery pack to meet the user's needs.

[0028] To make the above objects, features, and advantages of the present application more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes a detailed description as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 It is an exploded view of the structure of the battery cell provided by the embodiment of the present invention;

[0031] Figure 2 It is a schematic structural diagram of the battery cell provided by the embodiment of the present invention;

[0032] Figure 3 It is a sectional view taken along the Figure 2 A-A in

[0033] Figure 4 It is Figure 3 an enlarged schematic structural diagram at B in

[0034] Figure 5 It is Figure 4 an enlarged schematic structural diagram at C in

[0035] Figure 6 It is a sectional view of the battery cell in the prior art.

[0036] Reference numerals: 10 - connection terminal; 11 - stepped portion; 101 - pole column; 102 - covering member; 20 - electrode group; 21 - tab; 30 - insulating member; 31 - first mounting hole; 41 - housing; 42 - cover plate; 401 - second mounting hole; 402 - limiting portion; 403 - extending portion; 404 - flanging portion; 50 - connecting member; 60 - sealing member; D1 - first direction; D2 - second direction; 1 - pole column structure; 2 - electrode group structure; 3 - cover plate structure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The following specific embodiments are provided to assist the reader in obtaining a comprehensive understanding of the methods, devices, and / or systems described herein. However, after understanding the disclosure of this application, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent. For example, the order of operations described herein is merely exemplary and is not limited to the order set forth herein, but rather changes that will be apparent after understanding the disclosure of this application may be made, except for operations that must occur in a specific order. In addition, descriptions of features known in the art may be omitted for the sake of clarity and conciseness.

[0038] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, devices, and / or systems described herein that will be apparent after understanding the disclosure of this application.

[0039] Throughout the specification, when an element (such as a layer, region, or substrate) is described as "on" another element, "connected to" another element, "coupled to" another element, "above" another element, or "covering" another element, it may be directly "on," "connected to," "coupled to," "above," or "covering" the other element, or there may be one or more other elements intervening therebetween. In contrast, when an element is described as "directly on" another element, "directly connected to" another element, "directly coupled to" another element, "directly above" another element, or "directly covering" another element, there may be no other elements intervening therebetween.

[0040] As used herein, the term "and / or" includes any one of the listed related items and any combination of any two or more of them.

[0041] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or parts, these members, components, regions, layers, or parts are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or part from another. Thus, the first member, component, region, layer, or part referred to in the examples described herein may also be referred to as the second member, component, region, layer, or part without departing from the teachings of the examples.

[0042] For ease of description, spatial relationship terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship between one element and another as shown in the accompanying drawings. Such spatial relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is flipped, an element described as "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientation of "above" and "below" depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relationship terms used herein will be interpreted accordingly.

[0043] The terms used herein are for the purpose of describing various examples only and are not intended to limit the present disclosure. Unless the context clearly dictates otherwise, the singular forms are also intended to include the plural forms. The terms "comprising", "including", and "having" enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof that exist, but do not preclude the existence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0044] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the accompanying drawings may occur. Accordingly, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that occur during manufacturing.

[0045] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. Additionally, although the examples described herein have a variety of configurations, other configurations are possible, as will be apparent after understanding the disclosure of the present application.

[0046] According to a first aspect of the present invention, a battery cell is provided, which specifically includes a connection terminal 10, a pole group 20, an insulating member 30, and a housing.

[0047] Hereinafter, the specific structure of the battery cell according to the present embodiment as described above will be described.

[0048] In the present embodiment, as Figures 1 to 4 shown, the connection terminal 10 is used to output the electric energy stored in the battery cell to the outside; an ear 21 protruding outward is formed at an end of the pole group 20. The ear 21 includes a positive ear and a negative ear. The connection terminal 10 also includes a positive terminal and a negative terminal. The positive terminal is connected to the positive ear, and the negative terminal is connected to the negative ear.

[0049] The insulating member 30 is disposed between the electrode group 20 and the connection terminal 10. The insulating member 30 is formed of an insulating material, such as a plastic material. One side of the insulating member 30 facing away from the electrode group 20 abuts against one side of the outer casing facing the inside of the battery cell. In this way, the electrode group 20 can be separated from the outer casing to avoid short circuits. The insulating member 30 is formed into a plate-like structure, such as a rectangular or circular plate-like structure. The insulating member 30 is provided with a first mounting hole 31, and the first mounting hole 31 is formed into a through-hole structure. The tab 21 passes through the first mounting hole 31 and is connected to the connection terminal 10, so that the connection terminal 10 does not have to extend below the insulating member 30 (i.e., the side of the insulating member 30 facing the electrode group 20). In this way, the installation space reserved for assembly in the outer casing is reduced, thereby improving the utilization rate of the internal space of the battery cell and increasing the battery cell capacity.

[0050] See Figure 3 and Figure 6 As shown by comparing the battery cell of the present embodiment and the battery cell in the prior art, in the present embodiment, as Figure 3 shown, the side of the electrode group 20 provided with the tab 21 can abut against the insulating member 30; the structure of the battery cell in the prior art is as Figure 6 shown, the bottom of the pole structure 1 extends below the cover plate structure 3 and is connected to the tab on the electrode group structure 2. In order to facilitate assembly, a spacing H is reserved between the electrode group structure 2 and the cover plate structure 3. Comparing it with the Figure 4 present embodiment, the distance H1 between the electrode group 20 and the inner wall of the outer casing in the first direction D1 in the present embodiment is significantly smaller than Figure 6 H in [reference], so that in the case of the same size of the outer casing, the battery cell structure of the present embodiment can improve the utilization rate of the internal space of the battery cell, thereby increasing the battery cell capacity.

[0051] Furthermore, in the present embodiment, as Figure 3 and Figure 4 shown, the outer casing is provided with a second mounting hole 401. The second mounting hole 401 is a through-hole structure, and a protruding limiting portion 402 is formed on the inner wall of the second mounting hole 401. The limiting portion 402 can be an annular structure protruding inward on the inner wall of the second mounting hole 401. The connection terminal 10 is disposed on the side of the limiting portion 402 facing the outside of the battery cell, so as to determine the installation position of the connection terminal 10. A part of the insulating member 30 abuts against the side of the limiting portion 402 facing away from the connection terminal 10.

[0052] Even further, in the present embodiment, as Figure 4 shown, the second mounting hole 401 is formed with an extension portion 403 protruding toward the outside of the battery cell. The extension portion 403 can be formed into an annular structure to surround the side wall of the connection terminal 10 in the circumferential direction, so as to achieve circumferential limiting and fixing of the connection terminal 10.

[0053] As Figure 3 andFigure 4 As shown, a protruding step portion 11 is formed on the side wall of the connection terminal 10. In the axial direction of the connection terminal 10, the step portion 11 is arranged at one end of the connection terminal 10 close to the limiting portion 402. One end of the extending portion 403 away from the limiting portion 402 is bent towards the connection terminal 10 to form a flanging portion 404 that is crimped with the connection terminal 10, so that the step portion 11 is clamped between the limiting portion 402 and the flanging portion 404, thus fixedly connecting the connection terminal 10 to the housing. The bending angle of the flanging portion 404 is preferably 90°, so as to ensure the appearance of the battery cell and ensure that the connection terminal 10 is fixedly connected firmly and reliably.

[0054] Preferably, as Figure 4 shown, in the first direction D1, the size of the flanging portion 404 is t, and 0.5 mm ≤ t ≤ 5 mm, ensuring that the flanging portion 404 has sufficient structural strength and can ensure the smooth bending of the flanging portion 404; in the second direction D2, the size of the flanging portion 404 is w, and w ≥ 0.6 mm, so that the flanging portion 404 can effectively overlap with the connection terminal 10, thus ensuring that the connection terminal 10 is fixedly connected firmly and reliably.

[0055] Furthermore, in this embodiment, as Figure 4 shown, the connection terminal 10 includes a pole column 101 and a covering member 102. The pole column 101 is made of a metal material, and the covering member 102 is formed as an annular structure covering the side wall in the circumferential direction of the pole column 101. The covering member 102 is made of an insulating material, for example, the same plastic material as the insulating member 30 can be used, so as to insulate the pole column 101 from the housing and avoid causing a short circuit. The above-mentioned step portion 11 is arranged on the side wall of the pole column 101, and the covering member 102 is conformally attached to the circumferential side wall of the pole column 101 and extends to the bottom edge of the pole column 101 to improve the insulation effect.

[0056] Furthermore, the tab 21 on the electrode group 20 is connected to the bottom of the pole column 101, that is, the tab 21 is connected to the side of the pole column 101 facing the inside of the battery cell; in the first direction D1, at least part of the flanging portion 404 is arranged above the pole column 101, and in the second direction D2, the distance between the end of the flanging portion 404 and the side wall of the step portion 11 in the circumferential direction is e, and e ≥ 0.2 mm, so that the flanging portion 404 and the pole column 101 have sufficient crimping area, thus avoiding the situation of the compression and rebound of the seal member 60 as described below when the pole column 101 is stressed, resulting in seal failure.

[0057] Preferably, w - e ≥ 0.4 mm, so that even when the covering member 102 is provided, the flanging portion 404 can still effectively crimp the connection terminal 10, thus ensuring that the connection terminal 10 is fixedly connected firmly and reliably.

[0058] In this embodiment, as Figure 4As shown, in the first direction D1, the thickness dimension of the covering member 102 between the stepped portion 11 and the flanging portion 404 is a, and a ≥ 0.4 mm; in the first direction D1, the thickness dimension of the covering member 102 between the stepped portion 11 and the limiting portion 402 is b, and b ≥ 0.4 mm, so as to ensure the insulation withstand voltage strength between the connection terminal 10 and the outer shell; it should be noted that the dimensions of a and b can be the same or different.

[0059] In this embodiment, as Figure 4 shown, the battery cell further includes a sealing member 60 clamped between the connection terminal 10 and the limiting portion 402. The sealing member 60 can be an elastic sealing ring, so as to ensure the sealing between the connection terminal 10 and the outer shell and meet the assembly requirements of the battery cell. Preferably, the sealing member 60 is an annular structure formed by a rotating body with an L-shaped cross-section, so that a part of the sealing member 60 is clamped between the pole post 101 and the limiting portion 402 in the first direction D1, and abuts against the covering member 102 in the second direction D2, while a part of the sealing member 60 is arranged on the inner wall side of the limiting portion 402, so as to improve the sealing performance.

[0060] In this embodiment, as Figure 4 and Figure 5 shown, the battery cell further includes a connecting member 50. The connecting member 50 can be formed into a sheet-like structure. The connecting member 50 is arranged between the pole post 101 and the pole tab 21 and is used for connecting the pole post 101 and the pole tab 21. One end of the connecting piece for connecting the pole tab 21 is formed with an opening in the thickness direction to clamp and position the pole tab 21. The connecting piece is welded to the bottom of the pole post 101.

[0061] In this embodiment, as Figures 1 to 4 shown, the outer shell includes a housing 41 and a cover plate 42. An accommodation cavity is formed inside the housing 41, and the electrode group 20 and the insulating member 30 are arranged in the accommodation cavity; the cover plate 42 is connected to the housing 41 to close the housing 41.

[0062] The second mounting hole 401 is opened in the housing 41 or the cover plate 42. Preferably, as Figures 1 to 4, the second mounting hole 401 is formed in the housing 41. When the second mounting hole 401 is formed in the housing 41, the assembly of the insulating member 30 and the electrode group 20 is specifically carried out by passing the tab 21 through the first mounting hole 31 first, then loading the insulating member 30 and the electrode group 20 into the accommodating cavity together, and pulling the tab 21 out of the second mounting hole 401 and passing it through the sealing member 60; then connecting the tab 21 to the pole column 101 in the connection terminal 10; after welding, placing the sealing member 60 and the connection terminal 10 in the limiting portion 402, and bending the extending portion 403 to form a flanging portion 404 pressed against the connection terminal 10, so that the sealing member 60 is in a compressed state; finally, welding the cover plate 42 to the housing 41 to close the accommodating cavity. Such an assembly avoids the problem of interference between the electrode group and the rounded corner at the bottom of the housing during the assembly of the existing technology, and cancels the bottom plate structure compared with the electrode core structure in the existing technology, saving costs.

[0063] In addition, setting the second mounting hole 401 on the housing 41 can also avoid the situation that when the length of the cover plate is short, the arrangement position of the tab is likely to block the electrolyte injection port and the explosion-proof valve vent area, affecting the sealing of the injection port by the rubber plug, and it is easy to block the explosion-proof valve when the battery core is thermally out of control, resulting in the inability of the gas inside the battery core to be discharged in time, thus exacerbating the out-of-control situation.

[0064] In this embodiment, the first direction D1 is perpendicular to the second direction D2. When the battery core is a blade battery core or a square battery core, the cover plate 42 is formed into a rectangular plate-like structure. The first direction D1 can be the thickness direction of the cover plate 42, and the second direction D2 can be the width direction of the cover plate 42.

[0065] To verify that the mating structure of the connection terminal 10 and the outer shell of the present invention can better achieve the functions of fixing, sealing, and insulation. The following is a force and insulation withstand voltage test on the connection terminal 10 for the battery cores formed by assembling the connection terminal 10 with different parameters and the outer shell. The specific parameters and test results are shown in the following table.

[0066]

[0067] Note: In the table, the failure mode of " / " indicates that the force test and the insulation withstand voltage test are passed. The Z direction represents the axial direction of the connection terminal 10.

[0068] Referring to the above table, it can be seen that in Examples 1 to 6, t, w, e, w - e, a, and b are all within the defined parameter ranges, demonstrating that the fixing reliability, sealing property, and insulation property after the connection terminal 10 is assembled with the outer shell all meet the requirements of the service life and safety performance of the battery cell; in addition, in Comparative Example 1, the situation where the flanging part 404 is pulled off and deformed is mainly due to the too small size of t; in Comparative Example 2, the voltage breakdown of the covering part 102 is mainly due to the too small size of w - e; in Comparative Example 3, the situation where the flanging part 404 is pulled off and deformed is mainly due to the too small size of e; in Comparative Example 4, the cracking of the covering part 102 is mainly due to the too large size of t; in Comparative Example 5, the voltage breakdown of the covering part 102 is mainly due to the too small size of a; in Comparative Example 6, the voltage breakdown of the covering part 102 is mainly due to the too small size of b.

[0069] According to a battery cell provided by the present invention, the assembly is simple, and the insulating member is arranged between the electrode group and the device connection terminal; one side of the insulating member facing away from the electrode group abuts against one side of the outer shell facing the inside of the battery cell, and a first mounting hole is formed in the insulating member, and the electrode tab passes through the first mounting hole and is connected to the connection terminal, so that the connection terminal does not need to extend below the insulating member, thus reducing the installation space reserved in the outer shell for assembly, thereby improving the utilization rate of the internal space of the battery cell and increasing the battery cell capacity.

[0070] According to a battery pack provided by the present invention, it includes the battery cell as described above. There are multiple battery cells, and the multiple battery cells are connected in series and / or in parallel. The utilization rate of the internal space of the battery cell is improved, the battery cell capacity is increased, and further the energy density of the battery pack is improved to meet the user's requirements.

[0071] Finally, it should be noted that: the above - described embodiments are only specific implementation manners of the present application, used to illustrate the technical solutions of the present application, rather than limiting it. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: any person skilled in the art within the technical scope disclosed by the present application can still modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or perform equivalent substitution on some of the technical features; and these modifications, changes or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery cell, characterized in that, The battery cell includes: A connection terminal, including a pole post and a covering member; A pole group, with pole tabs protruding outwardly formed at its end, and the pole tabs are connected to the bottom of the pole post; A connecting member, disposed between the pole post and the pole tabs; An insulating member, disposed between the pole group and the connection terminal; a first mounting hole is formed on the insulating member, and the pole tabs pass through the first mounting hole to be connected to the connection terminal, such that the pole tabs and the connecting member are connected to the pole post on the side of the insulating member facing the connection terminal; the side of the insulating member facing the interior of the battery cell is in contact with the end of the pole group where the pole tabs are provided; A housing, the side of the insulating member facing away from the pole group is in contact with the side of the housing facing the interior of the battery cell; a second mounting hole is formed on the housing, the connecting member and a part of the pole tabs are disposed in the second mounting hole, a protruding limiting portion is formed on the inner wall of the second mounting hole, and the connection terminal is disposed on the side of the limiting portion facing the exterior of the battery cell; the second mounting hole forms an extending portion protruding outwardly from the battery cell, and the extending portion surrounds the circumferential side wall of the connection terminal; a protruding step portion is formed on the side wall of the connection terminal, and the end of the extending portion away from the limiting portion is bent towards the connection terminal to form a flanging portion crimped to the connection terminal, such that the step portion is clamped between the limiting portion and the flanging portion; In a first direction, the dimension of the flanging portion is t, 0.5 mm ≤ t ≤ 5 mm; in a second direction, the dimension of the flanging portion is w, w ≥ 0.6 mm; In the second direction, the distance between the end of the flanging portion and the circumferential side wall of the step portion on the pole post is e, e ≥ 0.2 mm, w - e ≥ 0.4 mm; The covering member is formed as an annular structure covering the circumferential side wall of the pole post, and the covering member is made of an insulating material; in the first direction, the thickness dimension of the covering member between the step portion and the flanging portion is a, a ≥ 0.4 mm; in the first direction, the thickness dimension of the covering member between the step portion and the limiting portion is b, b ≥ 0.4 mm; The housing includes: A housing body, forming a receiving cavity, and the pole group and the insulating member are disposed in the receiving cavity; A cover plate, connected to the housing body; The second mounting hole is formed on the housing body or the cover plate.

2. The battery cell according to claim 1, characterized in that, The battery cell further includes: A sealing member, clamped between the connection terminal and the limiting portion.

3. A battery pack, characterized in that, A battery cell including the battery cell according to claim 1 or 2.

Images