Battery cell and battery pack

Abstract

The utility model relates to the technical field of energy storage equipment, in particular to a battery cell and a battery pack. The battery cell comprises a shell with an opening and a top cover assembly; the shell is provided with a containing cavity, the electrode assembly is arranged in the containing cavity, the top cover assembly is arranged at an opening of the shell and used for sealing the opening, the top cover assembly comprises a top cover piece, a lower insulating part and a connecting piece, the lower insulating part and the top cover piece are arranged on the side, close to the electrode assembly, of the top cover piece, and the lower insulating part is connected with the top cover piece through the connecting piece. The surface, away from the electrode assembly, of the lower insulating part is attached to the surface, close to the electrode assembly, of the top cover plate. The battery cell can ensure the reliability of connection between the top cover plate and the lower insulating part.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage devices, and in particular to a battery cell and a battery pack. Background Art

[0002] The top cover assembly of the battery cell is generally composed of a top cover sheet, a lower insulating part, an upper insulating part, a pole, etc. The pole passes through the pole hole of the lower insulating part, the pole hole of the top cover sheet, and the hole of the upper insulating part in turn, and is assembled together by riveting or injection molding. The metal connecting piece is welded to the pole of the top cover assembly, and the lower insulating part plays an insulating role therein. Among them, a boss is provided on the lower insulating part, and a groove is provided corresponding to the top cover sheet. It is fixed by interference fit, or fixed by bonding the lower insulating part and the top cover sheet. The lower insulating part and the top cover sheet are easily separated, resulting in a gap between the lower insulating part and the top cover sheet, and the connection reliability is poor, which affects the insulation effect of the lower insulating part on the top cover and the metal connecting piece. Utility Model Content

[0003] The purpose of the present application is to provide a battery cell and a battery pack, wherein the battery cell can ensure the reliability of the connection between the top cover sheet and the lower insulating member.

[0004] To this end, in a first aspect, an embodiment of the present application provides a battery cell, comprising: a shell having an opening; the shell having a accommodating cavity, the electrode assembly being arranged in the accommodating cavity, and a top cover assembly, which is arranged at the opening of the shell and is used to seal the opening, the top cover assembly comprising a top cover sheet, a lower insulating member and a connecting member, the lower insulating member and the top cover sheet are arranged on a side of the top cover sheet close to the electrode assembly, the lower insulating member and the top cover sheet are connected through the connecting member, the surface of the lower insulating member away from the electrode assembly is adhered to the surface of the top cover sheet close to the electrode assembly, a first mounting hole is arranged on the top cover sheet, a second mounting hole is arranged on the lower insulating member, the first mounting hole and the second mounting hole are connected, the battery cell has a first direction, the connecting member has a connecting portion extending along the first direction and a first limiting portion and a second limiting portion respectively connected to two ends of the connecting portion in the first direction, the connecting portion is penetrated through the first mounting hole and the second mounting hole, the first limiting portion is adhered to a side of the cover sheet away from the electrode assembly to limit the top cover sheet, and the second limiting portion is adhered to a side of the lower insulating member away from the top cover sheet to limit the lower insulating member.

[0005] In a possible implementation, the first mounting hole includes a first hole segment and a second hole segment arranged along a first direction, the second hole segment is adjacent to the lower insulating member, the hole diameter of the first hole segment is larger than the hole diameter of the second hole segment, and the first limiting portion is arranged in the first hole segment.

[0006] In a possible implementation manner, the second limiting portion is an elastic structure.

[0007] In a possible implementation manner, the first limiting portion, the connecting portion, and the second limiting portion are integrally formed.

[0008] In a possible implementation, the battery cell has a second direction, and the lower insulating member includes a first sub-member and a second sub-member sequentially arranged along the second direction, and the first sub-member and the second sub-member are detachably connected, wherein the second direction intersects with the first direction.

[0009] In a possible implementation, a connecting buckle is provided on one of the first sub-component and a connecting hole is provided on the other, the connecting buckle is inserted into the connecting hole, and the outer wall of the connecting buckle at least partially abuts against the inner wall of the connecting hole.

[0010] In a possible implementation, the lower insulating member includes an arc portion, the arc portion protrudes toward the top cover sheet, and the arc portion is an elastic structure.

[0011] In a possible implementation, the lower insulating member further includes two straight portions respectively connected to two ends of the arc portion, and a central angle M of the arc portion is: 0°<M≤15°.

[0012] In a possible implementation, a maximum distance H between the outer surface of the arc portion and a plane where a side of the straight portion close to the electrode assembly is located is: 0 mm < H ≤ 8 mm.

[0013] In a second aspect, an embodiment of the present application provides a battery pack comprising the above-mentioned battery cell.

[0014] According to a battery cell and a battery pack provided in an embodiment of the present application, the battery cell connects a top cover sheet and a lower insulating sheet through a connecting piece, so that the lower insulating sheet and the top cover sheet are connected through the connecting piece, and the surface of the lower insulating sheet away from the electrode assembly is fitted with the surface of the top cover sheet close to the electrode assembly, which can ensure that the top cover sheet and the lower insulating sheet are in abutment and fit, thereby ensuring the reliability of the connection between the top cover sheet and the lower insulating sheet and better ensuring that the lower insulating sheet insulates the top cover sheet and the metal connecting sheet.

[0015] The top cover sheet and the lower insulating member are connected by a connecting piece, and there is no need to set a connecting structure on the top cover sheet and the lower insulating member or set a glue for bonding between the top cover sheet and the lower insulating member. The first limiting portion is attached to the upper surface of the top cover, and the second limiting portion is attached to the lower surface of the lower insulating member, so that the top cover sheet and the lower insulating member are clamped between the first limiting portion and the second limiting portion, which can ensure that the top cover sheet and the lower insulating member are fully attached, thereby ensuring the reliability of the connection between the top cover sheet and the lower insulating member. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In addition, in the drawings, the same components are marked with the same reference numerals, and the drawings are not drawn according to the actual scale.

[0017] Figure 1 It is a schematic diagram of the structure of a power cell according to an embodiment of the present application;

[0018] Figure 2 yes Figure 1 A schematic structural diagram of a top cover assembly of an embodiment of a power battery cell shown in FIG.

[0019] Figure 3 yes Figure 2 An exploded view of the top cover assembly shown in ;

[0020] Figure 4 yes Figure 3 A magnified image of area A;

[0021] Figure 5 yes Figure 2 A cross-sectional schematic diagram of the top cover assembly shown in;

[0022] Figure 6 yes Figure 5 Enlarged view of area B;

[0023] Figure 7 is a schematic diagram of an exploded structure of a top cover assembly of another embodiment of the present application;

[0024] Figure 8 yes Figure 7 Enlarged view of the middle C area;

[0025] Fig. 9 is a schematic diagram of an exploded structure of a top cover assembly of another embodiment of the present application;

[0026] Fig.10 yes Fig. 9 A schematic plan view of the lower insulating member of the top cover assembly shown in FIG.

[0027] Description of reference numerals:

[0028] X, first direction; Y, second direction;

[0029] 1. Shell;

[0030] 2. Top cover assembly; 21. Top cover sheet; 211. First mounting hole; 2111. First hole section; 2112. Second hole section; 212. First through hole; 22. Lower insulating member; 221. Second mounting hole; 222. First sub-member; 223. Second sub-member; 224. Connecting buckle; 225. Connecting hole; 226. Arc portion; 227. Straight portion; 228. Second through hole; 23. Connecting member; 231. Connecting portion; 232. First limiting portion; 233. Second limiting portion; 24. Pole; 25. Second insulating member; 251. Third through hole. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0032] The disclosure below provides many different embodiments or examples to realize the different structures of the embodiments of the present application. In order to simplify the disclosure of the embodiments of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present application. In addition, the embodiments of the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0033] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0034] In order to solve the problems in the prior art, the present application provides a battery cell and a battery pack, wherein the battery cell can ensure the reliability of the connection between the top cover sheet and the lower insulating member.

[0035] like Figure 1-10 As shown, an embodiment of the present application provides a battery cell, including: a shell 1 with an opening and a top cover assembly 2.

[0036] The housing 1 has a receiving cavity, and the electrode assembly is arranged in the receiving cavity. Specifically, the housing 1 can be a rectangular parallelepiped structure, and an opening is arranged at the top of the housing 1, and the electrode assembly is taken in and out through the opening.

[0037] The top cover assembly 2 is arranged at the opening of the shell 1 and is used to seal the opening. The top cover assembly 2 includes a top cover sheet 21, a lower insulating member 22 and a connecting member 23. The lower insulating member 22 and the top cover sheet 21 are arranged on the side of the top cover sheet 21 close to the electrode assembly. The lower insulating member 22 and the top cover sheet 21 are connected through the connecting member 23. The surface of the lower insulating member 22 away from the electrode assembly is in contact with the surface of the top cover sheet 21 close to the electrode assembly. Specifically, there are multiple connecting members 23, and the multiple connecting members 23 are distributed in a matrix. The top cover sheet 21 and the lower insulating member 22 are connected by multiple connecting members 23, further ensuring that the top cover sheet 21 and the lower insulating member 22 can be fully in contact with each other, so that the lower insulating member 22 and the top cover sheet 21 are in a state of abutting and fitting, ensuring the connection between the two, and ensuring that the lower insulating member 22 insulates the top cover sheet 21 and the metal connecting sheet to avoid insulation failure.

[0038] In the present application, the top cover sheet 21 and the lower insulating member 22 are connected by the connecting member 23. There is no need to set a connecting structure for connection on the top cover sheet 21 and the lower insulating member 22 or to set a glue for adhesion between the top cover sheet 21 and the lower insulating member 22. This can ensure that the top cover sheet 21 and the lower insulating member 22 are fully fitted, thereby ensuring the reliability of the connection between the top cover sheet 21 and the lower insulating member 22.

[0039] In the related art, the top cover assembly 2 of the battery cell generally includes a top cover sheet 21, a lower insulating member, an upper insulating member, a pole 24, etc. The pole 24 passes through the hole of the pole 24 of the lower insulating member, the hole of the pole 24 of the top cover sheet 21, and the hole of the upper insulating member in sequence, and is assembled together by riveting or injection molding. The lower insulating member and the top cover sheet 21 are fixed by clamping or bonding, and the reliability of the connection is poor. In the present application, the top cover sheet 21 and the lower insulating member 22 are fixed by a connector 23, and the top cover sheet 21 and the lower insulating member 22 can be ensured to be fully fitted, thereby improving the reliability of the connection between the top cover sheet 21 and the lower insulating member 22.

[0040] like Figure 3-5As shown, in some embodiments, a first mounting hole 211 is provided on the top cover sheet 21, a second mounting hole 221 is provided on the lower insulating member 22, the first mounting hole 211 and the second mounting hole 221 are connected, the battery cell has a first direction X, the connecting member 23 has a connecting portion 231 extending along the first direction X and a first limiting portion 232 and a second limiting portion 233 respectively connected to the two ends of the connecting portion 231 in the first direction X, the connecting portion 231 is penetrated by the first mounting hole 211 and the second mounting hole 221, the first limiting portion 232 is attached to the side of the cover sheet away from the electrode assembly to limit the top cover sheet 21, and the second limiting portion 233 is attached to the side of the lower insulating member 22 away from the top cover sheet 21 to limit the lower insulating member 22.

[0041] In the present application, the connecting portion 231 of the connecting member 23 passes through the first mounting hole 211 and the second mounting hole 221, and the top cover sheet 21 is limited by the first limiting portion 232, and the lower insulating member 22 is limited by the second limiting portion 233. The top cover sheet 21 and the lower insulating member 22 are clamped by the first limiting portion 232 and the second limiting portion 233, so that the top cover sheet 21 can be fully fitted with the lower insulating member 22.

[0042] Optionally, glue may be filled in the gap between the connector 23 and the first mounting hole 211 , and the glue may not fill the gap between the first mounting hole 211 , the second mounting hole 221 and the connector 23 , thereby improving the air tightness and the fixing effect of the connector 23 on the top cover sheet 21 and the lower insulating member 22 .

[0043] like Figure 4 As shown, in some embodiments, the first mounting hole 211 includes a first hole segment 2111 and a second hole segment 2112 arranged along the first direction X, the second hole segment 2112 is adjacent to the lower insulating member 22, the aperture of the first hole segment 2111 is larger than the aperture of the second hole segment 2112, and the first limiting portion 232 is arranged in the first hole segment 2111.

[0044] In the present application, after the connecting portion 231 passes through the first mounting hole 211 and the second mounting hole 221, the first limiting portion 232 is located in the first hole section 2111 of the first mounting hole 211 to limit the top cover sheet 21. Moreover, the first limiting portion 232 is located in the first hole section 2111, which can realize a hidden design and prevent the connecting member 23 from protruding to the outside of the top cover sheet 21 and affecting the flatness of the surface of the top cover assembly 2.

[0045] In some embodiments, the second limiting portion 233 is an elastic structure that can be elastically deformed to facilitate assembly.

[0046] In some embodiments, the first limiting portion 232 , the connecting portion 231 , and the second limiting portion 233 are integrally formed to facilitate processing and manufacturing.

[0047] In the present application, the second limiting portion 233 is located on the side of the lower insulating member 22 away from the top cover sheet 21, so as to limit the lower insulating member 22. When the connecting member 23 is pressed down to pass through the first mounting hole 211 and the second mounting hole 221, the second limiting portion 233 can pass through the first mounting hole 211 and the second mounting hole 221 in sequence by its own deformation. After passing through the first mounting hole 211 and the second mounting hole 221, the second limiting portion 233 returns to its original state and limits the lower insulating member 22. The connection and fixation of the top cover sheet 21 and the lower insulating member 22 can be achieved by only pressing the connecting member 23 into the first mounting hole 211 and the second mounting hole 221, which is easy to operate.

[0048] Optionally, the second limiting portion 233 may also be a threaded column, and a threaded hole is provided on the lower insulating member 22 . By rotating the connecting member 23 , the second limiting portion 233 is threadedly connected to the threaded hole, thereby completing the connection between the top cover sheet 21 and the lower insulating member 22 .

[0049] like Figure 7-8 As shown, in some embodiments, the battery cell has a second direction Y, and the lower insulating member 22 includes a first sub-member 222 and a second sub-member 223 sequentially arranged along the second direction Y, and the first sub-member 222 and the second sub-member 223 are detachably connected, wherein the second direction Y intersects with the first direction X. Specifically, the first direction X and the second direction Y are perpendicular to each other.

[0050] In the present application, because the lower insulating member 22 and the top cover sheet 21 require multiple connecting members 23 to be connected, by configuring the lower insulating member 22 to be a detachable first sub-member 222 and a second sub-member 223, the first sub-member 222 and the second sub-member 223 can be pre-fixed to the top cover sheet 21 through the connecting members 23, respectively, and then the first sub-member 222 and the second sub-member 223 can be connected, thereby facilitating the assembly of the top cover sheet 21 and the lower insulating member 22.

[0051] Optionally, the lower insulating member 22 may also be an integral structure. After the lower insulating member 22 and the top cover sheet 21 are positioned, the top cover sheet 21 and the lower insulating member 22 are connected and fixed by a plurality of connecting members 23 .

[0052] like Figure 8 As shown, in some embodiments, a connection buckle 224 is provided on one of the first sub-component 222 and the second sub-component 223, and a connection hole 225 is provided on the other, the connection buckle 224 is inserted into the connection hole 225, and the outer side wall of the connection buckle 224 at least partially abuts against the inner side wall of the connection hole 225. The connection buckle 224 and the first sub-component 222 are integrally formed by injection molding, and the connection hole 225 and the second sub-component 223 are integrally formed by injection molding.

[0053] In the present application, the first sub-component 222 and the second sub-component 223 are connected by the connecting buckle 224 and the connecting hole 225. After the connecting buckle 224 is inserted into the connecting hole 225, the connection between the first sub-component 222 and the second sub-component 223 can be completed, which facilitates the connection between the first sub-component 222 and the second sub-component 223.

[0054] Specifically, when the first sub-component 222 and the second sub-component 223 of the lower insulating component 22 are respectively connected to the top cover sheet 21 through the connecting component 23, the outer wall of the connecting buckle 224 remains in contact with the inner wall of the connecting hole 225, so that there is a force along the second direction Y between the connecting buckle 224 and the connecting hole 225. The first sub-component 222 and the second sub-component 223 will always be subjected to the force in the second direction Y respectively, so that the first connecting buckle 224 and the first connecting hole 225 remain in a tightly fastened state, thereby achieving the effect of the upper surface of the lower insulating component 22 being tightly attached to the lower surface of the top cover sheet 21.

[0055] like Figure 9-10 As shown, in some embodiments, the lower insulating member 22 includes an arc portion 226 , the arc portion 226 protrudes toward the top cover sheet 21 , and the arc portion 226 is an elastic structure.

[0056] In the present application, the arc portion 226 of the lower insulating member 22 faces the top cover sheet 21. When the connecting member 23 connects the top cover sheet 21 and the lower insulating member 22, the arc portion 226 is squeezed and deformed, so that the lower insulating member 22 can maintain a full fit with the top cover sheet 21. In the present application, the number of arc portions 226 can be one or more.

[0057] In a specific embodiment, the number of arc portions 226 is one, and the arc portion 226 is arranged in the middle area of ​​the lower insulating member 22. When the lower insulating member 22 is connected to the top cover sheet 21 through the connecting member 23, the arc portion 226 is deformed and fully fits with the bottom surface of the top cover sheet 21. The first limiting portion 232 and the second limiting portion 233 of the connecting member 23 can also keep the top cover sheet 21 and the lower insulating member 22 in contact with each other, thereby ensuring the locking effect of the top cover sheet 21 and the lower insulating member 22 in the first direction X.

[0058] In another embodiment, the lower insulating component 22 has an arc portion 226, and the lower insulating component 22 includes a first sub-component 222 and a second sub-component 223. The first sub-component 222 and the second sub-component 223 are detachably connected, and the first sub-component 222 and the second sub-component 223 are respectively provided with an arc portion 226. When the arc portion 226 is deformed and adheres tightly to the top cover sheet 21, there is a pulling force in the second direction Y between the first sub-component 222 and the second sub-component 223. While ensuring that the top cover sheet 21 and the lower insulating component 22 are fully fitted, the connection reliability between the first sub-component 222 and the second sub-component 223 is also guaranteed.

[0059] In some embodiments, the lower insulating member 22 further includes two straight portions 227 respectively connected to two ends of the arc portion 226 , and a central angle M of the arc portion 226 is: 0°<M≤15°.

[0060] In the present application, the straight portions 227 at both ends are connected to the top cover sheet 21 , so that the arc portion 226 in the middle is deformed, thereby allowing the lower insulating member 22 to fully fit with the top cover sheet 21 .

[0061] Preferably, the central angle M of the arc portion 226 is: 1°≤M≤9°.

[0062] In some embodiments, the maximum distance H between the outer surface of the arc portion 226 and the plane where the side of the straight portion 227 close to the electrode assembly is located is: 0mm<H≤8mm.

[0063] In the present application, there is a certain height difference between the arc portion 226 and the straight portion 227. By setting the height difference H at 0mm<H≤8mm, when the top cover sheet 21 and the lower insulating member 22 are assembled, the buffered height difference can be just used up, so that the top cover sheet 21 and the lower insulating member 22 are fully fitted, and the entire arc portion 226 is always subject to the force given by the lower surface of the top cover sheet 21. This force causes the arc portion 226 of the lower insulating member 22 to deform in the direction away from the lower surface of the top cover sheet 21, thereby achieving the purpose of close fit between the lower insulating member 22 and the top cover sheet 21.

[0064] Preferably, the maximum distance H between the outer surface of the arc portion 226 and the plane where the side of the straight portion 227 close to the electrode assembly is located is: 0.5mm≤H≤5mm.

[0065] In some embodiments, a first through hole 212 is disposed on the top cover sheet 21 , a second through hole 228 is disposed on the lower insulating member 22 , and the top cover assembly 2 further includes a pole 24 penetrating the first through hole 212 and the second through hole 228 .

[0066] In the present application, the pole 24 passes through the first through-hole 212 and the second through-hole 228 and is electrically connected to the electrode assembly in the shell 1 . Two poles 24 are provided, namely a positive pole 24 and a negative pole 24 .

[0067] In some embodiments, the top cover assembly 2 further includes a second insulating member 25 , which abuts against a side of the top cover sheet 21 away from the lower insulating member 22 , and is provided with a third through hole 251 for the pole 24 to pass through.

[0068] In the present application, the second insulating member 25 is disposed on a side of the top cover sheet 21 away from the lower insulating member 22 , and the pole 24 passes through the third through hole 251 of the second insulating member 25 to ensure the insulation effect between the pole 24 and the top cover sheet 21 .

[0069] The battery cell connects the top cover sheet 21 and the lower insulating member 22 via a connector 23, and there is no need to provide a connection structure on the top cover sheet 21 and the lower insulating member 22 or to provide a glue for bonding between the top cover sheet 21 and the lower insulating member 22, thereby ensuring that the top cover sheet 21 and the lower insulating member 22 are fully fitted together, thereby ensuring the reliability of the connection between the top cover sheet 21 and the lower insulating member 22.

[0070] An embodiment of the present application provides a battery pack, comprising the above-mentioned battery cell.

[0071] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0072] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0073] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A battery cell, characterized in that: include: A shell (1) having an opening; the shell (1) having a receiving cavity, the electrode assembly being arranged in the receiving cavity, and A top cover assembly (2) is arranged at the opening of the shell (1) and is used to cover the opening. The top cover assembly (2) comprises a top cover sheet (21), a lower insulating member (22) and a connecting member (23). The lower insulating member (22) is arranged on a side of the top cover sheet (21) close to the electrode assembly. The lower insulating member (22) is connected to the top cover sheet (21) via the connecting member (23). The surface of the lower insulating member (22) away from the electrode assembly is in contact with the surface of the top cover sheet (21) close to the electrode assembly. The top cover sheet (21) is provided with a first mounting hole (211), and the lower insulating member (22) is provided with a second mounting hole (221). The first mounting hole (211) and the second mounting hole (221) are connected to each other. The two mounting holes (221) are connected, the battery cell has a first direction (X), the connecting member (23) has a connecting portion (231) extending along the first direction (X), and a first limiting portion (232) and a second limiting portion (233) respectively connected to two ends of the connecting portion (231) in the first direction (X), the connecting portion (231) is passed through the first mounting hole (211) and the second mounting hole (221), the first limiting portion (232) is attached to a side of the cover sheet (21) away from the electrode assembly to limit the top cover sheet (21), and the second limiting portion (233) is attached to a side of the lower insulating member (22) away from the top cover sheet (21) to limit the lower insulating member (22).

2. The battery cell according to claim 1, characterized in that: The first mounting hole (211) comprises a first hole section (2111) and a second hole section (2112) arranged along a first direction (X), the second hole section (2112) being adjacent to the lower insulating member (22), the hole diameter of the first hole section (2111) being larger than the hole diameter of the second hole section (2112), and the first limiting portion (232) being arranged in the first hole section (2111).

3. The battery cell according to claim 1, characterized in that: The second limiting portion (233) is an elastic structure.

4. The battery cell according to claim 1, characterized in that: The first limiting portion (232), the connecting portion (231) and the second limiting portion (233) are integrally formed.

5. The battery cell according to claim 1, characterized in that: The battery cell has a second direction (Y), and the lower insulating component (22) includes a first subcomponent (222) and a second subcomponent (223) arranged along the second direction (Y), and the first subcomponent (222) and the second subcomponent (223) are detachably connected, wherein the second direction (Y) intersects with the first direction (X).

6. The battery cell according to claim 5, characterized in that: One of the first sub-component (222) and the second sub-component (223) is provided with a connecting buckle (224), and the other is provided with a connecting hole (225); the connecting buckle (224) is inserted into the connecting hole (225), and the outer side wall of the connecting buckle (224) is at least partially in contact with the inner side wall of the connecting hole (225).

7. The battery cell according to claim 1, characterized in that: The lower insulating member (22) comprises an arc portion (226), the arc portion (226) protrudes toward the top cover sheet (21), and the arc portion (226) is an elastic structure.

8. The battery cell according to claim 7, characterized in that: The lower insulating member (22) further comprises two straight portions (227) respectively connected to two ends of the circular arc portion (226); a central angle M of the circular arc portion (226) is: 0°<M≤15°.

9. The battery cell according to claim 8, characterized in that: The maximum distance H between the outer surface of the arc portion (226) and the plane on which the side of the straight portion (227) close to the electrode assembly is located is: 0mm<H≤8mm.

10. A battery pack, characterized in that: Comprising the battery cell as described in any one of claims 1 to 9.

Images