Battery cell and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell and a battery pack. Wherein the battery cell comprises a shell, a pole group and a negative electrode cover plate assembly, the shell is provided with a containing cavity and an opening communicated with the containing cavity, the pole group is arranged in the containing cavity, the negative electrode cover plate assembly comprises a cover plate, the cover plate covers the opening and seals the pole group in the containing cavity, and the surface of one side, located in the containing cavity, of the cover plate is covered with an insulating layer; according to the utility model, the insulating layer is covered on the inner side surface of the cover plate, so that the electrical safety of the battery cell can be improved, the short circuit risk caused by direct contact between the pole group and the tab and the cover plate is avoided, and the overall safety of the product is improved. The surface of the cover plate is covered with the insulating layer, so that a plastic part does not need to be arranged on the cover plate, the structure of the cathode cover plate assembly is simplified, the number of parts is reduced, the production and assembly process is simplified, and the production efficiency is improved.

Description

Technical Field

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

[0002] As battery technology matures and becomes increasingly widely used in electric vehicles and energy storage, the requirements for battery performance and safety are increasing. The battery cell is a core component for battery pack safety and assembly, and its structural design is crucial to its safety.

[0003] Conventional blade cells utilize a double-sided tab structure, with both positive and negative electrodes mounted on a cover assembly. This cover assembly typically includes a plastic component, typically over 5 cm tall. When installing the cover assembly onto the cell housing, the plastic component must be pushed into the housing. Because the plastic component is relatively soft, it is prone to shrinkage and deformation, impacting assembly precision and stability. Utility Model Content

[0004] In view of this, the present invention provides a battery cell and a battery pack to solve the problem that plastic parts provided on the cover assembly are prone to shrinkage and deformation during the installation of the cover assembly.

[0005] In a first aspect, the present invention provides a battery cell, comprising:

[0006] a housing having a receiving cavity and an opening communicating with the receiving cavity;

[0007] an electrode group, disposed in the accommodating cavity;

[0008] The negative electrode cover plate assembly comprises a cover plate, which is arranged at the opening and seals the electrode group in the accommodating cavity. The surface of one side of the cover plate located in the accommodating cavity is covered with an insulating layer.

[0009] Beneficial Effects: When installing the negative electrode cover assembly in this battery cell, the negative electrode cover assembly sealing cover is placed at the opening. Since the inner surface of the cover is covered with an insulating layer, the insulating layer can improve the electrical safety of the battery cell, avoid the risk of short circuits caused by direct contact between the electrode group and the electrode tab and the cover, and improve the overall safety of the product. Because the surface of the cover is covered with an insulating layer, there is no need to install plastic parts on the cover, which reduces the space occupied by the plastic parts in the storage cavity, providing more space for the electrode group, thereby increasing the energy density of the battery cell. At the same time, the elimination of plastic parts simplifies the structure of the negative electrode cover assembly, reduces the number of components, helps to simplify the production and assembly process, and improves production efficiency.

[0010] In an optional embodiment, the cover includes a cover body and an extension portion provided on one side surface of the cover body, the size of the extension portion is smaller than the size of the cover body, so as to form a step surface between the four sides of the extension portion and the cover body, the shell is provided with an end portion of the opening abutting against the bottom surface of the step surface, and the side wall of the step surface abuts against the inner wall of the shell.

[0011] Beneficial Effects: By providing an extension on one side of the cover body, with the extension smaller than the cover body, a stepped surface is formed between the extension and the cover body. When installing the cover, the extension is inserted into the accommodating cavity, so that the end of the shell abuts the bottom of the stepped surface, and the sidewall of the stepped surface closely contacts the inner wall of the shell. This ensures accurate alignment between the cover and shell, improving assembly efficiency. Furthermore, this ensures good contact between the cover and shell, contributing to improved overall structural stability and enhanced sealing performance between the cover and shell.

[0012] In an optional embodiment, chamfers are provided around the extension portion.

[0013] Beneficial effect: By providing chamfers around the extension, it helps to guide the accurate alignment between the extension and the opening during the assembly process, making it easier to insert the extension into the opening and making it easier to install the cover in place.

[0014] In an optional embodiment, the bottom surface of the extension portion is covered with the insulating layer.

[0015] Beneficial effect: By covering the bottom surface of the extension with an insulating layer, the risk of short circuit caused by direct contact between the pole group and the pole ear and the cover plate can be effectively avoided. At the same time, the spraying area of ​​the insulating layer on the surface of the cover plate can be reduced. There is no need to spray the insulating layer on the step surface, thereby reducing the production cost of the cover plate.

[0016] In an optional embodiment, the insulating layer is any one of an ultraviolet curing paint layer and an electrostatic metal powder paint layer.

[0017] Beneficial effects: The UV-curable coating layer can complete the curing process in a short time, improving the spraying production efficiency of the cover insulation layer. At the same time, the cured coating layer has good wear resistance and chemical resistance, and is suitable for applications that require long-term durability.

[0018] The electrostatic metal powder coating layer has good corrosion resistance and wear resistance after curing, and is suitable for applications that require corrosion resistance.

[0019] In an optional embodiment, the negative electrode cover plate assembly further includes a welding electrode plate, which is provided on the cover plate. The ends of the electrode group are provided with electrode tabs corresponding to the welding electrode plates, and the welding electrode plate and the electrode tabs are fixedly connected by welding.

[0020] Beneficial effect: A welding plate is set at the position corresponding to the pole ear on the cover. Since the plastic part is eliminated from the cover, the welding plate can be directly welded to the pole ear without lengthening the pole ear or using other connectors for welding. This simplifies the installation process of the welding plate and the pole ear, ensures a stable electrical connection, and improves the reliability of the electrical connection.

[0021] In an optional embodiment, an explosion-proof valve is further included, which is arranged on the side wall of the shell and located in the middle area of ​​the shell; the number of the explosion-proof valves is N, 1≤N≤3.

[0022] Beneficial Effects: Providing the explosion-proof valve on the side wall of the housing and in the middle area of ​​the housing helps to more evenly distribute the internal pressure, achieve the shortest exhaust path, and ensure that the explosion-proof valve can respond in time when needed.

[0023] The design of multiple explosion-proof valves can improve the redundancy of the system. Even if one of the explosion-proof valves fails, the other explosion-proof valves can still play a protective role and improve the safety of the battery cells.

[0024] In an optional embodiment, a support plate is further included, which is arranged along the length direction of the shell. The support plate is arranged in the accommodating cavity and is located between the pole group and the side wall of the shell on which the explosion-proof valve is installed. A plurality of exhaust holes are opened on the support plate.

[0025] Beneficial Effects: By providing a support plate within the housing to support the electrode assembly, the structural stability of the battery cell can be enhanced, reducing displacement or deformation of the electrode assembly due to vibration or external forces during use. Multiple vent holes on the support plate allow for the release of excessive internal pressure, preventing internal pressure buildup and improving safety.

[0026] In an optional embodiment, flanges are provided on opposite sides of the support plate, and the flanges are arranged along the length direction of the support plate. A avoidance groove is formed between the two groups of flanges, and the position of the explosion-proof valve corresponds to the position of the avoidance groove.

[0027] Beneficial effect: By arranging flanges on opposite sides of the support plate, an avoidance groove is formed between the two sets of flanges. When installing the pole group and the support plate, the pole group and the support plate are pushed into the accommodating cavity, and the flanges contact the inner wall of the shell, thereby supporting the support plate and the pole group. In the process of pushing the pole group and the support plate, the explosion-proof valve enters the avoidance groove, avoiding direct contact between the pole group and the support plate and the explosion-proof valve, thereby protecting the explosion-proof valve from damage.

[0028] In a second aspect, the present invention further provides a battery pack, comprising:

[0029] A plurality of the battery cells.

[0030] Beneficial effects: This battery pack includes the battery cell as described above, and therefore has all the beneficial technical effects of the battery cell, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 This is a schematic structural diagram of a battery cell according to an embodiment of the present utility model;

[0033] Figure 2 This is a schematic diagram of an explosion of a battery cell according to an embodiment of the present utility model;

[0034] Figure 3 This is a partial structural diagram of a support plate in a battery cell according to an embodiment of the present utility model;

[0035] Figure 4 This is a cross-sectional view of a battery cell according to an embodiment of the present utility model;

[0036] Figure 5 for Figure 4 A partial enlarged schematic diagram;

[0037] Figure 6 This is a schematic structural diagram of a negative electrode cover assembly in a battery cell according to an embodiment of the present utility model;

[0038] Figure 7 This is a structural schematic diagram of a negative electrode cover assembly in a battery cell from another perspective according to an embodiment of the utility model;

[0039] Figure 8 This is a side view of a negative electrode cover assembly in a battery cell according to an embodiment of the present utility model;

[0040] Figure 9 This is a cross-sectional view of a negative electrode cover assembly in a battery cell according to an embodiment of the present utility model.

[0041] Description of reference numerals:

[0042] 1. Shell; 2. Pole group; 201. Pole ear; 3. Negative cover assembly; 301. Cover; 3011. Step surface; 3012. Cover body; 3013. Extension; 30131. Chamfer; 302. Insulation layer; 303. Welding plate; 4. Explosion-proof valve; 5. Support plate; 501. Exhaust hole; 502. Flanged edge; 6. Insulating diaphragm; 7. Pad welding station; 8. Positive cover assembly; 9. Positive terminal plate. DETAILED DESCRIPTION

[0043] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0044] Conventional blade cells utilize a double-sided tab structure, with both positive and negative electrodes mounted on a cover assembly. This cover assembly typically includes a plastic component, typically over 5 cm tall. When installing the cover assembly onto the cell housing, the plastic component must be pushed into the housing. Because the plastic component is relatively soft, it is prone to shrinkage and deformation, impacting assembly precision and stability.

[0045] In order to solve the above technical problems, the following Figures 1 to 9 Shown, an embodiment of the present utility model is described.

[0046] According to an embodiment of the present invention, on the one hand, Figures 1 to 6 As shown, a battery cell is provided, including a shell 1, an electrode group 2 and a negative electrode cover assembly 3.

[0047] Specifically, if Figure 1 and Figure 2 As shown, the housing 1 is provided with an accommodating cavity and an opening communicating with the accommodating cavity.

[0048] Specifically, if Figure 1 、 Figure 2 and Figure 4 As shown, the pole group 2 is arranged in the accommodating cavity of the housing 1 .

[0049] Specifically, if Figures 1 to 7As shown, the negative electrode cover plate assembly 3 includes a cover plate 301, which is arranged at the opening of the housing 1 and seals the electrode group 2 in the receiving cavity. The surface of the cover plate 301 located in the receiving cavity is covered with an insulating layer 302.

[0050] When installing the negative electrode cover plate assembly 3 in this battery cell, the sealing cover of the negative electrode cover plate assembly 3 is placed at the opening. Since the inner surface of the cover plate 301 is covered with an insulating layer 302, the insulating layer 302 can improve the electrical safety of the battery cell, preventing the risk of short circuits caused by direct contact between the electrode group 2 and the electrode tab 201 and the cover plate 301, thereby improving the overall safety of the product. Because the surface of the cover plate 301 is covered with an insulating layer 302, there is no need to set a plastic part on the cover plate 301, which reduces the space occupied by the plastic part in the storage cavity, provides more space for the electrode group 2, and thus improves the energy density of the battery cell. At the same time, the elimination of the plastic part simplifies the structure of the negative electrode cover plate assembly 3, reduces the number of components, helps to simplify the production and assembly process, and improves production efficiency.

[0051] Specifically, the thickness of the insulating layer 302 on the cover plate 301 can be set to 1mm-2mm. The thickness of the insulating layer 302 can be set according to actual needs. In the embodiment of the present application, there is no specific limitation on the thickness of the insulating layer 302.

[0052] Specifically, the shape of the cover 301 is adapted to the shape of the opening to ensure that the cover 301 seals the accommodating cavity. For example, the opening and the cover 301 can be set to be rectangular or square, etc. In the embodiment of the present application, there is no specific restriction on the shape of the cover 301 and the opening.

[0053] Specifically, the cover plate 301 is sealed at the opening, and the cover plate 301 can be sealed on the shell 1 by welding or riveting. In the embodiment of the present application, there is no specific limitation on the connection method between the cover plate 301 and the shell 1.

[0054] Specifically, the shape of the pole group 2 is adapted to the shape of the accommodating cavity, so that the pole group 2 can be installed into the accommodating cavity, while ensuring that the pole group 2 is firmly fixed in the accommodating cavity. Both the pole group 2 and the accommodating cavity can be set to be rectangular. In the embodiment of the present application, there is no specific restriction on the shape of the pole group 2 and the accommodating cavity.

[0055] In one embodiment, Figures 4 to 9As shown, the cover 301 includes a cover body 3012 and an extension 3013. The extension 3013 is provided on one side of the cover body 3012. The extension 3013 is smaller than the cover body 3012, and a stepped surface 3011 is formed around the extension 3013 and between the cover body 3012 and the extension 3013. The housing 1 is provided at the open end so as to abut against the bottom surface of the stepped surface 3011, and the sidewalls of the stepped surface 3011 abut against the inner wall of the housing 1. The sidewalls of the stepped surface 3011 also form the sidewalls of the extension 3013.

[0056] By providing an extension 3013 on one side of the cover body 3012, with the extension 3013 being smaller than the cover body 3012, a stepped surface 3011 is formed between the extension 3013 and the cover body 3012. When installing the cover 301, the extension 3013 is inserted into the accommodating cavity, so that the end of the housing 1 abuts against the bottom of the stepped surface 3011, and the sidewall of the extension 3013 closely contacts the inner wall of the housing 1. This ensures accurate alignment between the cover 301 and the housing 1, improving assembly efficiency. Furthermore, this ensures good contact between the cover 301 and the housing 1, contributing to improved overall structural stability and enhanced sealing performance between the cover 301 and the housing 1.

[0057] Specifically, the bottom width of the step surface 3011 can be adapted to the thickness of the shell 1 to ensure that after the cover plate 301 is matched with the shell 1, the outer surface of the shell 1 and the side surface of the cover plate 301 are in the same plane. In the embodiment of the present application, there is no specific restriction on the width of the step surface 3011 and the thickness of the shell 1.

[0058] Specifically, the shape of the extension portion 3013 matches the shape of the opening, so that the extension portion 3013 can be inserted into the opening, and the side wall of the extension portion 3013 abuts the inner wall of the housing 1. The thickness of the extension portion 3013 can be adaptively set according to the size of the cover plate 301. In the embodiment of the present application, the shape and thickness of the extension portion 3013 are not specifically limited.

[0059] In one embodiment, Figure 5 As shown, chamfers 30131 are provided around the extension portion 3013 .

[0060] Providing chamfers 30131 around the extension portion 3013 helps guide the accurate alignment between the extension portion 3013 and the opening during the assembly process, facilitates the insertion of the extension portion 3013 into the opening, and makes it easier to install the cover plate 301 in place.

[0061] Specifically, the chamfer 30131 can be set as a round chamfer 30131 or an inclined chamfer 30131. In the embodiment of the present application, the type of the chamfer 30131 is not specifically limited.

[0062] In one embodiment, Figure 7 As shown, the bottom surface of the extension portion 3013 is covered with an insulating layer 302 .

[0063] By covering the bottom surface of the extension portion 3013 with an insulating layer 302, the risk of short circuit caused by direct contact between the electrode group 2 and the electrode ear 201 and the cover plate 301 can be effectively avoided. At the same time, the spraying area of ​​the insulating layer 302 on the surface of the cover plate 301 can be reduced. There is no need to spray the insulating layer 302 on the step surface 3011, thereby reducing the production cost of the cover plate 301.

[0064] In one embodiment, the insulating layer 302 is any one of an ultraviolet curing paint layer and an electrostatic metal powder paint layer.

[0065] The UV-curable coating layer can complete the curing process in a short time, thereby improving the spraying production efficiency of the cover plate 301 and the insulating layer 302. At the same time, the cured coating layer has good wear resistance and chemical resistance, and is suitable for applications requiring long-term durability.

[0066] The electrostatic metal powder coating layer has good corrosion resistance and wear resistance after curing, and is suitable for applications that require corrosion resistance.

[0067] Specifically, depending on the specific requirements of the battery cell, you can choose between a UV-curable coating layer or an electrostatic metal powder coating layer. If fast curing, high wear resistance, and high gloss are required, choose a UV-curable coating layer; if a metallic texture and corrosion resistance are required, choose an electrostatic metal powder coating layer.

[0068] In one embodiment, Figure 2 、 Figure 4 and Figure 7 As shown, the negative electrode cover plate assembly 3 also includes a welding electrode plate 303, which is arranged on the cover plate 301. The end of the electrode group 2 is provided with a pole ear 201, and the position of the pole ear 201 corresponds to the position of the welding electrode plate 303, and the welding electrode plate 303 and the pole ear 201 are fixedly connected by welding.

[0069] A welding plate 303 is provided on the cover 301 at a position corresponding to the pole ear 201. Since the plastic part is eliminated from the cover 301, the welding plate 303 can be directly welded to the pole ear 201 without lengthening the pole ear 201 or using other connectors for connection and welding. This simplifies the installation process of the welding plate 303 and the pole ear 201, ensures a stable electrical connection, and improves the reliability of the electrical connection.

[0070] In one embodiment, Figure 2 As shown, the housing 1 further includes an explosion-proof valve 4, which is arranged on the side wall of the housing 1 and located in the middle area of ​​the housing 1. The number of the explosion-proof valves 4 is N, and 1≤N≤3.

[0071] Providing the explosion-proof valve 4 on the side wall of the housing 1 and in the middle area of ​​the housing 1 helps to more evenly distribute the internal pressure, achieve the shortest exhaust path, and ensure that the explosion-proof valve 4 can respond in time when needed.

[0072] The design of multiple explosion-proof valves 4 can improve the redundancy of the system. Even if one of the explosion-proof valves 4 fails, the other explosion-proof valves 4 can still play a protective role and improve the safety of the battery cell.

[0073] Specifically, a plurality of explosion-proof valves 4 may be arranged at intervals on the side wall of the housing 1 . In the embodiment of the present application, the arrangement of the explosion-proof valves 4 is not specifically limited.

[0074] In one embodiment, Figure 2 and Figure 3 As shown, it also includes a support plate 5, which is arranged along the length direction of the shell 1. The support plate 5 is arranged in the accommodating cavity, and the support plate 5 is located between the pole group 2 and the side wall of the shell 1 where the explosion-proof valve 4 is installed. A plurality of exhaust holes 501 are opened on the support plate 5.

[0075] By providing a support plate 5 within the housing 1 to support the electrode assembly 2, the structural stability of the battery cell can be enhanced, reducing displacement or deformation of the electrode assembly 2 due to vibration or external forces during use. Because the support plate 5 is provided with multiple vent holes 501, when the internal pressure of the battery cell is too high, the vent holes 501 can help release gas, preventing internal pressure accumulation and thus improving the safety of the battery cell.

[0076] Specifically, the support plate 5 can be set to any existing shape as long as the electrode group 2 is firmly fixed in the accommodating cavity. In the embodiment of the present application, the shape of the support plate 5 is not specifically limited.

[0077] Specifically, the plurality of exhaust holes 501 can be evenly distributed on the support plate 5 or unevenly distributed on the support plate 5. In the embodiment of the present application, there is no specific limitation on the distribution of the exhaust holes 501. Similarly, the exhaust holes 501 can be any shape, such as a circular hole or a square hole. In the embodiment of the present application, there is no specific limitation on the shape of the exhaust holes 501.

[0078] In one embodiment, Figure 3 As shown, flanges 502 are provided on opposite sides of the support plate 5 , respectively. The flanges 502 are arranged along the length direction of the support plate 5 , and an avoidance groove is formed between the two sets of flanges 502 . The position of the explosion-proof valve 4 corresponds to the position of the avoidance groove.

[0079] By arranging flanges 502 on opposite sides of the support plate 5, an avoidance groove is formed between the two sets of flanges 502. When installing the pole group 2 and the support plate 5, the pole group 2 and the support plate 5 are pushed into the accommodating cavity, and the flanges 502 contact the inner wall of the shell 1, thereby supporting the support plate 5 and the pole group 2. In the process of pushing the pole group 2 and the support plate 5, since the position of the explosion-proof valve 4 corresponds to the position of the avoidance groove, the explosion-proof valve 4 can enter the avoidance groove, avoiding direct contact between the pole group 2 and the support plate 5 and the explosion-proof valve 4, thereby protecting the explosion-proof valve 4 from damage.

[0080] Specifically, if Figure 2 As shown, the outer surface of the electrode group 2 may be covered with an insulating membrane 6 .

[0081] Specifically, if Figure 2 As shown, a soldering station 7 can also be provided on the cover plate 301. Figure 4 As shown, a positive electrode cover plate assembly 8 is provided on the end of the housing 1 opposite to the negative electrode cover plate assembly 3 , and a positive terminal plate 9 is provided between the positive electrode cover plate assembly 8 and the electrode group 2 .

[0082] The installation process of the battery cell in this embodiment is described as follows:

[0083] One or more explosion-proof valves 4 are mounted on the side wall of the housing 1 .

[0084] The support plate 5 is set between the electrode group 2 and the side wall of the shell 1 where the explosion-proof valve 4 is installed, and the electrode group 2 and the support plate 5 are pushed, and the electrode group 2 and the support plate 5 are pushed into the accommodating cavity. In the process of pushing the support plate 5 and the electrode group 2, since the two sides of the support plate 5 are provided with flanges 502, the avoidance groove formed between the flanges 502 can avoid the explosion-proof valve 4, preventing the explosion-proof valve 4 from contacting the support plate 5 or the electrode group 2, and protecting the explosion-proof valve 4 from damage.

[0085] The negative electrode cover plate assembly 3 is placed on the opening, and the welding electrode plate 303 is fixedly connected to the electrode tab 201 on the electrode group 2 by welding, and then the connection between the cover plate 301 and the shell 1 is sealed and fixed.

[0086] According to an embodiment of the present invention, on the other hand, a battery pack is provided, comprising a plurality of battery cells.

[0087] Specifically, multiple battery cells are connected in series and / or in parallel to form a battery cell module.

[0088] This battery pack includes the battery cell described above, and therefore has all the beneficial technical effects of the battery cell, which will not be described in detail here.

[0089] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that: include: A housing (1) having a receiving cavity and an opening communicating with the receiving cavity; A pole group (2) is arranged in the accommodating cavity; A negative electrode cover plate assembly (3) comprises a cover plate (301), wherein the cover plate (301) covers the opening and seals the electrode group (2) in the accommodating cavity, and an insulating layer (302) is covered on one side of the cover plate (301) located in the accommodating cavity.

2. The battery cell according to claim 1, characterized in that The cover plate (301) comprises a cover plate body (3012) and an extension portion (3013) provided on one side surface of the cover plate body (3012); the size of the extension portion (3013) is smaller than the size of the cover plate body (3012), so as to form a step surface (3011) around the extension portion (3013) and between the cover plate body (3012); the shell (1) is provided with an end portion of the opening abutting against the bottom surface of the step surface (3011), and the side surface of the step surface (3011) abutting against the inner wall of the shell (1).

3. The battery cell according to claim 2, characterized in that The extension portion (3013) is provided with chamfers (30131) around its periphery.

4. The battery cell according to claim 2, characterized in that The bottom surface of the extension portion (3013) is covered with the insulating layer (302).

5. The battery cell according to any one of claims 1 to 4, characterized in that: The insulating layer (302) is any one of an ultraviolet curing paint layer and an electrostatic metal powder paint layer.

6. The battery cell according to claim 1, characterized in that The negative electrode cover plate assembly (3) further comprises a welding electrode plate (303), wherein the welding electrode plate (303) is provided on the cover plate (301), and an electrode lug (201) is provided at the end of the electrode group (2) corresponding to the welding electrode plate (303), and the welding electrode plate (303) and the electrode lug (201) are fixedly connected by welding.

7. The battery cell according to claim 1, characterized in that It also includes an explosion-proof valve (4), which is arranged on the side wall of the shell (1) and located in the middle area of ​​the shell (1); the number of the explosion-proof valves (4) is N, 1≤N≤3.

8. The battery cell according to claim 7, characterized in that It also includes a support plate (5), which is arranged along the length direction of the shell (1), and is arranged in the accommodating cavity and located between the electrode group (2) and the side wall of the shell (1) on which the explosion-proof valve (4) is installed, and a plurality of exhaust holes (501) are opened on the support plate (5).

9. The battery cell according to claim 8, characterized in that The support plate (5) is provided with flanges (502) on opposite sides, respectively. The flanges (502) are arranged along the length direction of the support plate (5). An avoidance groove is formed between two groups of the flanges (502). The position of the explosion-proof valve (4) corresponds to the position of the avoidance groove.

10. A battery pack, characterized in that: include: A plurality of battery cells according to any one of claims 1 to 9.

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