Battery cell and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell and a battery, and the battery cell comprises a cover plate assembly which comprises a lower plastic part which is provided with a first connecting part; the end plate assembly is provided with a mounting part, and the lower plastic part is arranged on the mounting part; the end plate assembly comprises a second connecting part, and the second connecting part can be connected with the first connecting part in a matched mode so that the lower plastic part and the installation part can be kept fixed. The number of the second connecting parts is at least one, the number of the first connecting parts is not smaller than that of the second connecting parts, and each second connecting part is correspondingly connected with one first connecting part in a matched mode. According to the battery cell provided by the invention, the first connecting part and the second connecting part which are matched with each other are adaptively connected, so that the lower plastic part and the end plate assembly can be assembled together, the relative movement of the lower plastic part and the end plate assembly is effectively limited, and the stability of the lower plastic part and the end plate assembly is ensured; therefore, the unforeseen circumstances that the tab is torn and the tab is lapped with the battery cell shell when the tab and the battery cell shell move relatively are avoided.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell and a battery. Background Art

[0002] At present, 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 performance and safety of lithium-ion batteries are increasing.

[0003] Lithium cells are the core components of battery pack safety and assembly, and their structural design is crucial to cell safety. The current cell structure mostly uses cover plate explosion-proof valve or extruded shell structure.

[0004] The existing lithium battery cell has a large bending space on the positive electrode side and the aluminum tab has low strength, which makes it easy for the tab to tear and overlap with the shell. In addition, the end plate is in contact with the lower plastic surface, and there is an assembly gap between the pole group and the shell, which is prone to displacement, resulting in a high risk of overlap between the tab and the shell. Utility Model Content

[0005] The purpose of the present application is to provide a battery cell and a battery, so as to solve to a certain extent the technical problem in the prior art that the end plate and the lower plastic part of the existing battery cell are prone to displacement, resulting in the tab being easily torn and overlapping with the shell.

[0006] The present application provides a battery cell, comprising: a cover plate assembly, the cover plate assembly comprising a lower plastic part, the lower plastic part being provided with a first connecting portion;

[0007] An end plate assembly, wherein the end plate assembly is provided with a mounting portion, and the lower plastic part is provided on the mounting portion; the end plate assembly includes a second connecting portion, and the second connecting portion can be adapted to be connected with the first connecting portion so that the lower plastic part and the mounting portion are kept fixed;

[0008] The number of the second connection parts is at least one, the number of the first connection parts is not less than the number of the second connection parts, and each of the second connection parts is adapted to be connected with one of the first connection parts.

[0009] In the above technical solution, further, the end plate assembly includes an end plate body, the end plate body is provided with a first cavity and a second cavity, and the first cavity and the second cavity are respectively provided with the second connecting portion.

[0010] In any of the above technical solutions, further, the first connecting portion is a matching hole provided on the lower plastic part, and the second connecting portion is a fixing buckle capable of being snap-fitted with the matching hole.

[0011] In any of the above technical solutions, further, the fixing buckle at least includes:

[0012] A first buckle, the first buckle is columnar or rod-shaped, one end of the first buckle is connected to the end plate body, and the other end of the first buckle is provided with a first clamping portion;

[0013] A second buckle, the second buckle is columnar or rod-shaped, one end of the second buckle is connected to the end plate body, and the other end of the second buckle is provided with a second clamping portion;

[0014] A gap W2 is formed between the second buckle and the second buckle, and when the first buckle and / or the second buckle are subjected to an external force, the first buckle and the second buckle can approach each other.

[0015] In any of the above technical solutions, further, the first clamping portion protrudes by a predetermined thickness W1 relative to the side wall of the first buckle, and the second clamping portion protrudes by the predetermined thickness W1 relative to the side wall of the second buckle, wherein 0.1mm≤W1≤0.2mm; 2W1≤W2.

[0016] In any of the above technical solutions, further, when the cover plate assembly and the end plate assembly are in an assembled state, a predetermined height difference H1 is formed between the first clamping portion and the lower plastic part, and a predetermined height difference H1 is formed between the second clamping portion and the lower plastic part, wherein H1≥0.2mm.

[0017] In any of the above technical solutions, further, the cover plate assembly also includes a cover plate body, the lower plastic part is arranged on the cover plate body, and when the cover plate assembly and the end plate assembly are in an assembled state, the cover plate body abuts against the end plate body.

[0018] In any of the above technical solutions, further, the battery cell also includes:

[0019] The end plate body further comprises a third cavity, the third cavity is arranged between the first cavity and the second cavity, and the third cavity is used to accommodate the pole ear;

[0020] An output pole is arranged on the cover plate assembly, and the pole ear is connected to the output pole.

[0021] The present application also provides a battery, comprising the battery cell described in any of the above technical solutions, and thus having all the beneficial technical effects of the battery cell, which will not be repeated here.

[0022] Furthermore, the battery further comprises a plurality of battery cells, each of which comprises a shell, the shell is provided with an assembly port, and the cover plate assembly and the end plate assembly are both arranged at the assembly port.

[0023] In the above technical solution, further, the battery also includes:

[0024] A pole group, wherein the pole group is arranged in the shell;

[0025] A side plate, the side plate is arranged in the shell, and the side plate is in contact with at least a portion of the inner wall surface of the shell;

[0026] An insulating film, wherein the insulating film covers the electrode group;

[0027] An explosion-proof valve is arranged on the shell.

[0028] Compared with the prior art, the beneficial effects of this application are:

[0029] The battery cell provided in the present application comprises: a cover plate assembly, the cover plate assembly comprises a lower plastic part, and the lower plastic part is provided with a first connecting portion;

[0030] The end plate assembly is provided with a mounting portion, and the lower plastic part is arranged on the mounting portion; the end plate assembly includes a second connecting portion, and the second connecting portion can be adapted to be connected with the first connecting portion so that the lower plastic part and the mounting portion are kept fixed;

[0031] The number of the second connection parts is at least one, the number of the first connection parts is not less than the number of the second connection parts, and each second connection part is adapted to be connected with a first connection part.

[0032] The battery cell provided in the present application is adaptively connected through the first connecting part and the second connecting part that cooperate with each other, which can strengthen the assembly of the lower plastic part and the end plate assembly together, effectively limit the relative movement of the two, ensure the stability of the lower plastic part and the end plate assembly, thereby avoiding the accidental situation of the pole ear tearing and the pole ear overlapping with the battery cell shell when the two have relative movement, thereby improving the safety of the battery cell using the present battery cell.

[0033] The battery provided in the present application includes the battery cell described above. Therefore, the battery cell can limit the relative movement of the lower plastic part and the end plate body in two dimensions, thereby enhancing the stability of the assembly of the two and the stability of the pole ear, effectively reducing the risk of safety problems caused by the pole ear tearing and overlapping with the shell, thereby improving the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 A schematic diagram of the structure of a battery cell provided in an embodiment of the present application;

[0036] Figure 2 A schematic diagram of the structure of a battery cell provided in an embodiment of the present application;

[0037] Figure 3 for Figure 2 Section view along AA;

[0038] Figure 4 for Figure 3 A schematic diagram of the enlarged structure at M;

[0039] Figure 5 for Figure 3 Schematic diagram of the enlarged structure at N;

[0040] Figure 6 A schematic diagram of the structure of an end plate assembly of a battery cell provided in an embodiment of the present application;

[0041] Figure 7 A schematic structural diagram of a cover assembly of a battery cell provided in an embodiment of the present application.

[0042] Reference numerals:

[0043] 1-cover plate assembly, 101-lower plastic part, 102-cover plate body, 2-end plate assembly, 201-end plate body, 2011-first cavity, 2012-second cavity, 2013-third cavity, 202-installation part, 3-first connecting part, 4-second connecting part, 401-first buckle, 4011-first clip, 402-second clip, 4021-second clip, 403-third clip, 404-fourth clip, 5-battery cell, 501-shell, 502-pole group, 503-insulating film, 504-side plate, 505-explosion-proof valve, 506-pressure relief hole. DETAILED DESCRIPTION

[0044] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0045] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0046] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0047] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0048] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] Refer to the following Figures 1 to 7 The battery cell and the battery according to the embodiments of the present application are described.

[0050] See also Figures 1 to 7As shown, an embodiment of the present application provides a structure for fixing the output pole of a battery cell 5, and the structure for fixing the output pole of the battery cell 5 is particularly suitable for the output positive pole of the battery cell 5. The structure for fixing the output pole of the battery cell 5 includes: a cover plate assembly 1 and an end plate assembly 2, wherein the cover plate assembly 1 at least includes a lower plastic part 101, and the end plate assembly 2 is provided with a mounting portion 202, and the cover plate assembly 1 can be installed and fixed to the mounting portion 202, and the lower plastic part 101 is provided on a side surface of the cover plate assembly 1 facing the end plate assembly 2, and the lower plastic part 101 is provided with a first connecting part 3, and the end plate assembly 2 is provided with a second connecting part 4, and the first connecting part 3 and the second connecting part 4 can be adaptively connected, so as to fix the lower plastic part 101 and the end plate assembly 2 together, and in the present application, the number of the second connecting parts 4 is one, two or more, and the number of the first connecting parts 3 is not less than the number of the first connecting parts 3, so that each The second connecting parts 4 are all matched with corresponding first connecting parts 3. Preferably, in this embodiment, the number of first connecting parts 3 is the same as the number of second connecting parts 4, and both are preferably two. Each second connecting part 4 is adapted to be connected with one first connecting part 3 to enhance the assembly stability of the lower plastic part 101 and the mounting part 202, so that the lower plastic part 101 is stably arranged on the mounting part 202, thereby fixing the cover plate assembly 1 and the end plate assembly 2 together to avoid displacement of the cover plate assembly 1 and the end plate assembly 2 during the assembly process and during the use of the battery including the output pole fixing structure of the battery cell 5, which may cause the pole ear of the battery cell 5 to tear and overlap with the shell 501 during the displacement process, and other unexpected situations.

[0051] Specifically, the end plate assembly 2 includes an end plate body 201, which is in the shape of an elongated strip. The end plate body 201 forms a first cavity 2011 and a second cavity 2012. The first cavity 2011 is arranged near one end of the end plate body 201, and the second cavity 2012 is arranged near the other end of the end plate body 201. A second connecting portion 4 is arranged in the first cavity 2011, and another second connecting portion 4 is arranged in the second cavity 2012.

[0052] The portion of the lower plastic part 101 corresponding to the first cavity 2011 is provided with a first connecting portion 3, and the portion of the lower plastic part 101 corresponding to the second cavity 2012 is provided with another first connecting portion 3. During the process of assembling the cover plate assembly 1 and the end plate assembly 2, one of the first connecting portions 3 can be adapted to be connected with the second connecting portion 4 in the first cavity 2011, and the other second connecting portion 4 can be adapted to be connected with the second connecting portion 4 in the second cavity 2012, so that the lower plastic part 101 can be fixed to the end plate body 201 at positions close to the two ends, respectively, to ensure the stability between the lower plastic part 101 and the end plate body 201.

[0053] exist Figure 4In the state shown, the end plate body 201 is formed with an upper end port opening upward, and a mounting portion 202 is formed at the upper end port. The shape of the mounting portion 202 is adapted to the outer shape of the lower plastic part 101. After the cover plate assembly 1 and the end plate assembly 2 are assembled, the lower plastic part 101 is completely embedded in the mounting portion 202, and the side walls of the lower plastic part 101 and the side walls of the mounting portion 202 are mutually limited, further reducing the risk of movement or swaying between the two.

[0054] Furthermore, the second connection part 4 is a fixed buckle arranged in the first cavity 2011 and the second cavity 2012 , and the first connection part 3 is a matching hole that can be adapted and snap-fitted with the second connection part 4 .

[0055] Specifically, taking the first connection part 3 disposed in the first cavity 2011 as an example, the first connection part 3 includes a plurality of fixing buckles, and the plurality of fixing buckles have the same structure. Each fixing buckle is rod-shaped or column-shaped. The plurality of fixing buckles are arranged at equal intervals along the circumference of the same circle. Preferably, in this embodiment, the number of the fixing buckles is preferably four, and the four fixing buckles are arranged symmetrically in the center. The four fixing buckles are respectively the first buckle 401, the second buckle 402, the second buckle 403 and the third buckle 404. Figure 4 and Figure 5 The perspective shown shows two of the fixing buckles, which are respectively defined as the first buckle 401 and the second buckle 402. The first buckle 401 and the second buckle 402 are arranged at an interval. The first buckle 401 is columnar or rod-shaped. One end of the first buckle 401 is connected to the bottom wall of the first cavity 2011, and the other end of the first buckle 401 is provided with a first clamping portion 4011. The diameter of the first clamping portion 4011 is larger than the diameter of the first buckle 401.

[0056] The structure of the second clip 402 is the same as that of the first clip 401. The second clip 402 is arranged parallel to the first clip 401 and spaced apart. One end of the second clip 402 is connected to the bottom wall of the first cavity 2011, and the other end of the second clip 402 is provided with a second clipping portion 4021. The diameter of the second clip 4021 is larger than the diameter of the second clip 402.

[0057] Preferably, the first clamping portion 4011 is raised relative to the side wall of the first clamping portion 401 facing away from the second clamping portion 402, and the second clamping portion 4021 is raised relative to the side wall of the second clamping portion 402 facing away from the first clamping portion 401. More preferably, the first clamping portion 401 and the second clamping portion 402 are integrally formed with the end plate body 201, and the first clamping portion 401 and the second clamping portion 402 are elastic. A gap W2 is formed between any two adjacent fixed clamps. When the second connecting portion 4 is subjected to an external force, the distance between any two adjacent fixed clamps is shortened, and the four fixed clamps are moved toward each other respectively, so that all the fixed clamps can pass through the matching holes. After the external force is removed, each fixed clamp returns to its original position under the action of its own elastic force, so that the first connecting portion 3 and the second connecting portion 4 can be clamped with the matching holes.

[0058] The structure and arrangement of the third buckle 403 and the fourth buckle 404 can refer to the above content. The structure and arrangement of the fixed buckle in the second cavity 2012 are the same as those in the first cavity 2011. Those skilled in the art can fully understand and will not repeat them here. The material of the fixed buckle has good elasticity and toughness, and can be but not limited to PP, PE, etc.

[0059] Furthermore, in the present embodiment, the first clamping portion 4011 protrudes by a predetermined thickness W1 relative to the side wall of the first clamp 401, and correspondingly, the clamping portions on other fixed clamps also protrude by a predetermined thickness W1 relative to the side wall of their corresponding fixed clamps, preferably 0.1mm≤W1≤0.2mm, and more preferably 2W1≤W2. On the one hand, it ensures that the end of the fixed clamp can pass through the matching hole, and on the other hand, after each fixed clamp returns to its original position, the first connecting portion 3 and the second connecting portion 4 can be stably clamped with the matching ones, thereby ensuring the stability between the lower plastic part 101 and the end plate body 201.

[0060] Furthermore, after the cover plate assembly 1 and the end plate assembly 2 are assembled, the second connection portion 4 and the first connection portion 3 are in a mutually engaged state, and the fixing buckle is clamped on the upper surface of the matching hole. Figure 5 As shown, taking the first clamping portion 4011 and the second clamping portion 4021 as an example, a predetermined height difference H1 is formed between the lower surface of the lower plastic part 101 and the upper end surface of the first clamping portion 4011 and the upper end surface of the second clamping portion 4021. Preferably, H1 ≥ 0.2 mm, which can ensure that the lower plastic part 101 and the two fixing buckles do not contact each other, avoid interference, and affect the stability of the lower plastic part 101 in the end plate body 201.

[0061] When the cover plate assembly 1 and the end plate assembly 2 are assembled, the second connecting portion 4 and the first connecting portion 3 are in a mutually clamped state, and a height gap H2 is formed between the first clamping portion 4011 and the plate surface around the matching hole. Correspondingly, a height gap H2 is also formed between the second clamping portion 4021 and the panel around the matching hole. Preferably, 0mm≤H2≤0.15 is ensured to ensure the stability of the fixing buckle and the matching hole in the vertical direction, that is, the height direction of the end plate body 201 when they are mutually clamped, so as to avoid large vertical movement of the lower plastic part 101 and the end plate body 201.

[0062] Furthermore, the cover plate assembly 1 also includes a cover plate body 102, which can specifically be a common plain aluminum plate in the field. The lower plastic part 101 is arranged on a side surface of the cover plate body 102 facing the end plate body 201. After the cover plate assembly 1 and the end plate assembly 2 are assembled together, the cover plate body 102 abuts against the end plate body 201 and covers the mounting portion 202, thereby completely accommodating the lower plastic part 101 in the mounting portion 202, so that the lower plastic part 101 and the mounting portion 202 are limited in the horizontal direction or along the length direction of the end plate body 201, and the cover plate body 102 can limit the lower plastic part 101 and the end plate body 201 in the vertical direction or in the height direction of the end plate body 201, further enhancing the assembly stability of the cover plate assembly 1 and the end plate assembly 2 and reducing the probability of movement of the two components.

[0063] Further, the output pole fixing structure of the battery cell 5 also includes a pole ear and an output pole column (not shown in the figure), wherein the output pole column is provided with a pole column bottom plate (not shown in the figure), the pole column bottom plate can be connected and conducted with the output pole column, and the output pole column is provided on the cover plate body 102. The pole ear is specifically the pole ear of the following battery cell 5, the end plate body 201 is also provided with a third cavity 2013, the third cavity 2013 is arranged between the first cavity 2011 and the second cavity 2012, and the third cavity 2013 is independently arranged with the first cavity 2011 and the second cavity 2012, the third cavity 2013 is used to penetrate and accommodate the pole ear, and the third cavity 2013 provides an independent space for the pole ear, thereby protecting the pole ear and effectively reducing the risk of extrusion and tearing of the pole ear. The pole ear is connected to the pole column bottom plate, and the connection method can be laser welding, ultrasonic welding, etc., so that the pole ear is conducted with the output pole column through the technical bottom plate, so that the output pole column can be connected to the outside and powered.

[0064] It should be noted that, in this embodiment, the connection and fixation between the cover plate assembly 1 and the end plate assembly 2 are achieved by the first connecting portion 3 and the second connecting portion 4, and no holes are required on the surrounding side walls of the end plate body 201, thereby avoiding safety hazards caused by overlapping of the pole ear and the shell 501 described below.

[0065] To summarize, the output pole fixing structure of the battery cell 5 provided in the present application is adaptively connected through the matching first connecting part 3 and the second connecting part 4, which can strengthen the assembly of the lower plastic part 101 and the end plate assembly 2 together, effectively limit the relative movement between the two, ensure the stability of the lower plastic part 101 and the end plate assembly 2, thereby avoiding the accidental situation of the pole ear tearing and the pole ear overlapping with the battery cell 5 shell 501 when the two produce relative movement, thereby improving the safety of the battery cell 5 using the present battery cell 5 output pole fixing structure.

[0066] An embodiment of the present application further provides a battery, comprising the output pole fixing structure of the battery cell 5 described in any of the above embodiments, and thus having all the beneficial technical effects of the output pole fixing structure of the battery cell 5, which will not be described in detail herein.

[0067] Furthermore, if Figure 1 As shown, the battery also includes a plurality of battery cells 5, and the plurality of battery cells 5 have the same structure. Each battery cell 5 has a shell 501, and an opening is formed at one end of the shell 501 as an assembly port. The cover plate assembly 1 and the end plate assembly 2 are both arranged at the assembly port.

[0068] Furthermore, the battery further comprises a pole group 502, the pole lug in the output pole fixing structure of the battery cell 5 is the pole lug of the pole group 502, and the pole group 502 is arranged in the housing 501. Preferably, the output pole fixing structure of the battery cell 5 further comprises an insulating film 503, and the insulating film 503 is used to cover the pole group 502.

[0069] The output pole fixing structure of the battery cell 5 also includes a side panel 504. The shell 501 is specifically a rectangular shell with four side walls. The four side walls include two large surfaces with the largest areas, and side wall surfaces with the same area and smaller than the area of ​​the large surfaces. The side panel 504 is arranged in the shell 501. Preferably, in the present embodiment, the number of the side panels 504 is preferably two, but of course it is not limited to this. One of the side panels 504 is arranged on the inner wall surface of one of the side wall surfaces, and the other side panel 504 is arranged on the inner wall surface of the other side wall surface. The two side panels 504 can protect the pole group 502 placed in the shell 501.

[0070] Furthermore, the output pole fixing structure of the battery cell 5 also includes an explosion-proof valve 505, one of the multiple side walls of the shell 501 is provided with a pressure relief hole 506, and the explosion-proof valve 505 is arranged on the pressure relief hole 506. Preferably, the pressure relief hole 506 and the explosion-proof valve 505 are arranged on one of the two side wall surfaces of the shell 501.

[0071] In summary, the battery provided in the present application can limit the relative movement of the lower plastic part 101 and the end plate body 201 in two dimensions through the above-mentioned battery cell 5 output pole fixing structure, thereby enhancing the stability of the assembly of the two and the stability of the pole ear, and effectively reducing the risk of safety problems caused by the pole ear tearing and overlapping with the shell 501, thereby improving the safety of the battery.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, characterized in that: include: A cover plate assembly, the cover plate assembly comprising a lower plastic part, the lower plastic part being provided with a first connecting portion; An end plate assembly, wherein the end plate assembly is provided with a mounting portion, and the lower plastic part is provided on the mounting portion; the end plate assembly includes a second connecting portion, and the second connecting portion can be adapted to be connected with the first connecting portion so that the lower plastic part and the mounting portion are kept fixed; The number of the second connection parts is at least one, the number of the first connection parts is not less than the number of the second connection parts, and each of the second connection parts is adapted to be connected with one of the first connection parts.

2. The battery cell according to claim 1, characterized in that: The end plate assembly includes an end plate body, the end plate body is provided with a first cavity and a second cavity, and the first cavity and the second cavity are respectively provided with the second connecting portion.

3. The battery cell according to claim 2, characterized in that: The first connecting portion is a matching hole provided on the lower plastic part, and the second connecting portion is a fixing buckle capable of being snap-fitted with the matching hole.

4. The battery cell according to claim 3, characterized in that: The fixing buckle at least comprises: A first buckle, the first buckle is columnar or rod-shaped, one end of the first buckle is connected to the end plate body, and the other end of the first buckle is provided with a first clamping portion; A second buckle, the second buckle is columnar or rod-shaped, one end of the second buckle is connected to the end plate body, and the other end of the second buckle is provided with a second clamping portion; A gap W2 is formed between the first buckle and the second buckle, and when the first buckle and / or the second buckle are subjected to an external force, the first buckle and the second buckle can approach each other.

5. The battery cell according to claim 4, characterized in that: The first clamping portion protrudes from the side wall of the first buckle by a predetermined thickness W1, and the second clamping portion protrudes from the side wall of the second buckle by the predetermined thickness W1, wherein 0.1 mm ≤ W1 ≤ 0.2 mm; 2W1 ≤ W2.

6. The battery cell according to claim 4, characterized in that: When the cover plate assembly and the end plate assembly are in an assembled state, a predetermined height difference H1 is formed between the first clamping portion and the lower plastic part, and a predetermined height difference H1 is formed between the second clamping portion and the lower plastic part, wherein H1≥0.2 mm.

7. The battery cell according to any one of claims 2 to 6, characterized in that: The cover plate assembly also includes a cover plate body, the lower plastic part is arranged on the cover plate body, and when the cover plate assembly and the end plate assembly are in an assembled state, the cover plate body abuts against the end plate body.

8. The battery cell according to claim 2, characterized in that: The battery cell also includes: The end plate body further comprises a third cavity, the third cavity is arranged between the first cavity and the second cavity, and the third cavity is used to accommodate the pole ear; An output pole is arranged on the cover plate assembly, and the pole ear is connected to the output pole.

9. A battery, characterized in that: The battery comprises the battery cell according to any one of claims 1 to 8; the battery further comprises a battery cell, the number of the battery cells is plural, each of the battery cells comprises a shell, the shell is provided with an assembly port, the cover plate assembly and the end plate assembly are both arranged at the assembly port.

10. The battery according to claim 9, characterized in that The battery also includes: A pole group, wherein the pole group is arranged in the shell; A side plate, the side plate is arranged in the shell, and the side plate is in contact with at least a portion of the inner wall surface of the shell; An insulating film, wherein the insulating film covers the electrode group; An explosion-proof valve is arranged on the shell.

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