Insulating cover plate, top cover assembly and battery cell monomer

Abstract

The utility model relates to the technical field of batteries, and provides an insulating cover plate, a top cover assembly and a battery cell monomer. The insulating cover plate is applied to a top cover assembly of a battery cell monomer and comprises a plate body and an extension part, the extension part is connected to the plate body. The extending part is led out from the position, away from the side edge, of the plate body and is obliquely arranged in the direction close to the side edge. Therefore, the technical problem of short-circuit corrosion risk in the electrode assembly caused by falling of the insulating gummed paper between the tab and the shell can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an insulating cover plate, a top cover assembly and a single battery cell. Background Art

[0002] In the related art, the tab of the electrode assembly cannot be electrically connected to the housing. During the production process, insulating adhesive tape is usually pasted on the tab to achieve the insulating connection between the tab and the housing. With the long-term use of the battery, there is a risk that the insulating adhesive tape will fall off from the tab due to the weakening of the adhesive ability, which will cause the tab to be electrically connected to the housing, resulting in the risk of short circuit corrosion inside the electrode assembly. Summary of the Utility Model

[0003] Embodiments of the utility model provide an insulating cover plate, a top cover assembly and a single battery cell, which can improve the technical problem that the inside of the electrode assembly is at risk of short circuit corrosion due to the falling off of the insulating adhesive tape between the tab and the housing.

[0004] In a first aspect, an embodiment of the utility model provides an insulating cover plate, which is applied to the top cover assembly of a single battery cell, and includes:

[0005] A plate body;

[0006] An extension part, connected to the plate body, the extension part is led out from a position of the plate body far away from the side edge, and is inclined towards the direction close to the side edge.

[0007] In one embodiment, the inclination angle of the extension part is α, satisfying: 2° ≤ α ≤ 8°.

[0008] In one embodiment, the extension part extends along the side edge of the plate body.

[0009] In one embodiment, the number of the extension parts is set to be an even number greater than 2, and are respectively located on opposite sides of the plate body, wherein the extension parts located on the same side of the plate body are coplanar.

[0010] In one embodiment, the extension part is integrally formed with the plate body.

[0011] In a second aspect, an embodiment of the utility model further provides a top cover assembly, including the insulating cover plate as described above.

[0012] In a third aspect, an embodiment of the utility model further provides a single battery cell, including:

[0013] A housing;

[0014] An electrode assembly, arranged in the housing, the electrode assembly is connected with a tab;

[0015] The top cover assembly as described above;

[0016] Wherein, the plate body covers the housing, the extending portion extends into the housing, and is clamped between the housing wall surface of the housing and the tab.

[0017] In one embodiment, the number of the extending portions is set to at least two, and at least two of the extending portions are respectively located on opposite sides of the plate body. Wherein, in the extending direction perpendicular to the side edge of the plate body, for two opposite extending portions on the plate body, at one end far from the plate body, the distance between the sides of the two extending portions facing away from each other is D1, and the inner width of the housing is D2, satisfying: D1 = D2.

[0018] In one embodiment, the inner height of the housing is H1, the height of the electrode assembly is H2, and the height of the extending portion is H3, satisfying: H3 = H1 - H2.

[0019] In one embodiment, along the length direction of the plate body, the extending portion is spaced from the housing wall surface of the housing, and the spacing is D3, satisfying: 20 mm ≤ D3 ≤ 30 mm.

[0020] Advantageous effects of the embodiments of the present utility model:

[0021] In the embodiments of the present utility model, by providing the extending portion on the plate body, after the plate body covers the housing, the extending portion can be clamped between the housing wall surface of the housing and the tab of the electrode assembly, so as to isolate the housing from the tab by using the extending portion and prevent an electrical connection from being formed between the tab and the housing. At the same time, based on the inclined setting of the extending portion, the extending portion can also play a role of clamping and fixing to a certain extent, so that the plate body is firmly covered on the housing. Description of the drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the following drawings are only some embodiments of the present utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

[0023] Figure 1 It is a three-dimensional schematic diagram of the insulating cover plate provided by the embodiment of the present utility model;

[0024] Figure 2 It is a three-dimensional schematic diagram of the housing provided by the embodiment of the present utility model;

[0025] Figure 3 It is one of the cross-sectional views of the insulating cover plate and the housing after connection provided by the embodiment of the present utility model;

[0026] Figure 4 It is the second cross-sectional view after the insulating cover plate and the housing are connected provided by the embodiment of the present utility model;

[0027] Figure 5 It is the third cross-sectional view after the insulating cover plate and the housing are connected provided by the embodiment of the present utility model.

[0028] Reference numerals:

[0029] 10 - Plate body, 110 - Side edge, 20 - Extension part, 30 - Housing. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present utility model. In addition, it should be understood that the specific implementation manners described herein are only used to illustrate and explain the present utility model, and are not used to limit the present utility model. In the present utility model, unless otherwise stated, the orientation terms such as "upper" and "lower" usually refer to the upper and lower in the actual use or working state of the device, specifically the drawing direction in the accompanying drawings; and "inner" and "outer" refer to the outline of the device.

[0031] Specifically, please refer to Figures 1 to 5 , the embodiment of the present application provides an insulating cover plate. This insulating cover plate is applied to the top cover assembly of a battery cell. The insulating cover plate includes a plate body 10 and an extension part 20. The extension part 20 is connected to the plate body 10. The extension part 20 extends from a position of the plate body 10 away from the side edge 110 and is inclined in a direction close to the side edge 110.

[0032] In this embodiment, by providing the extension part 20 on the plate body 10, after the plate body 10 is covered on the housing 30, the extension part 20 can be clamped between the wall surface of the housing 30 and the tab of the electrode assembly, so as to use the extension part 20 to insulate the housing 30 from the tab and prevent an electrical connection from being formed between the tab and the housing 30. At the same time, based on the inclined setting of the extension part 20, the extension part 20 can also play a role of clamping and fixing to a certain extent, so that the plate body 10 is firmly covered on the housing 30.

[0033] It can be understood that the housing 30 is an aluminum housing. The extension part 20 is configured to be clamped between the wall surface of the housing 30 and the tab of the electrode assembly located inside the housing 30. Thus, the extension part 20 is used to isolate the housing 30 from the tab, preventing an electrical connection from being formed between the tab and the housing 30. Based on the reliable connection between the extension part 20 and the plate body 10, the extension part 20 will not fall off, thereby ensuring the insulating connection between the tab and the housing 30.

[0034] The extension part 20 extends along the extending direction of the side edge 110 of the plate body 10. Wherein, the two opposite surfaces of the plate body 10 in the thickness direction are respectively plate surfaces, and the position between the two plate surfaces is the side edge 110 of the plate body 10. Making the extension part 20 extend along the side edge 110 of the plate body 10 can make the extension part 20 adapt to the side edge 110, ensuring that the extension part 20 can fit the shape of the plate body 10.

[0035] In some embodiments, the plate body 10 is rectangular, and the side edge 110 of the plate body 10 is the side extending along its length direction. At this time, the extension part 20 extends along the length direction of the plate body 10. The plate body 10 can also be set to be circular, and the side edge 110 of the plate body 10 is the side extending along the arc direction. At this time, the extension part 20 also extends along the arc direction of the edge of the plate body 10. The plate body 10 can also be set to be oval, and the side edge 110 of the plate body 10 is the side extending along the elliptical arc direction. At this time, the extension part 20 also extends along the elliptical arc direction of the edge of the plate body 10. The plate body 10 can also be set to be irregular, and the extension part 20 extends along the side edge 110 of the irregular plate body 10.

[0036] As Figure 3 shown, along the width direction of the plate body 10, the distance between the connection part of the extension part 20 and the plate body 10 and the side edge 110 of the plate body 10 is D4. D4 is the distance between the leading end of the extension part 20 and the side surface of the plate body 10.

[0037] It can be understood that when an extension part 20 is provided on both sides of the plate body 10 in the width direction, based on each extension part 20 being inclined along the thickness direction of the plate body 10 towards the direction close to the side edge 110 of the plate body 10, the two extension parts 20 are generally distributed in a V-shaped pattern, making the two extension parts 20 move away from each other.

[0038] As Figures 3 to 5 shown, the extension part 20 has a certain height, enabling the extension part 20 to extend a certain distance inside the housing 30. Specifically, the extension part 20 can be made to abut against the electrode assembly. Thus, not only can the insulating connection between the tab and the housing 30 be ensured through the extension part 20, but the position of the electrode assembly can also be fixed by using the extension part 20 to prevent the electrode assembly from shaking.

[0039] Please continue to refer toFigures 3 to 5 , based on the inclined setting of the extension portion 20, the end of the extension portion 20 away from the plate body 10 can also be in contact with the wall surface of the housing 30, and in contact with the tab and the electrode assembly. Thus, after the extension portion 20 is clamped between the tab and the wall surface of the housing 30, it can also apply a force to the tab and the electrode assembly to further lock the position of the electrode assembly and prevent the electrode assembly from shaking.

[0040] In some embodiments, the inclination angle of the extension portion 20 is α, satisfying: 2° ≤ α ≤ 8°.

[0041] As Figure 3 shown, the inclination angle α of the extension portion 20 is the angle between the extension portion 20 and the vertical direction.

[0042] In some embodiments, the inclination angle α of the extension portion 20 can be set to 2°, 3°, 4°, 5°, 6°, 7°, 8°, or any value between any two of them. Among them, the inclination angle α of the extension portion 20 can be reasonably selected based on different types of battery cells, the model of the housing 30, etc., and combined with the design of parameters such as the height and thickness of the extension portion 20, so that the extension portion 20 can contact the wall surface of the housing 30 in the width direction and contact the electrode assembly in the height direction, so as to lock the electrode assembly and prevent it from shaking.

[0043] In some embodiments, the number of the extension portions 20 is set to at least two, and at least two extension portions 20 are respectively located on opposite sides of the plate body 10.

[0044] For example, the plate body 10 is rectangular, and one extension portion 20 is respectively arranged on both sides in the width direction of the plate body 10, and each extension portion 20 corresponds to the tab area of the electrode assembly. Thus, the extension portions 20 on each side can respectively achieve the effect of insulating connection between the tab on that side and the housing 30. It should be noted that along the length direction of the housing 30, the electrode assembly has no tab areas at positions close to both sides of the housing 30, and the rest of the areas are tab areas.

[0045] For example, the plate body 10 is rectangular, and a plurality of extension portions 20 are respectively arranged on both sides in the width direction of the plate body 10. For all the extension portions 20 on each side, the extension portions 20 are arranged at intervals along the length direction of the plate body 10, and each extension portion 20 can correspond to a tab. Thus, each tab is respectively insulated from the housing 30 through an extension portion 20.

[0046] In some embodiments, the number of the extension portions 20 is set to an even number greater than 2, and are respectively located on opposite sides of the plate body 10. Among them, the extension portions 20 on the same side of the plate body 10 are arranged coplanarly.

[0047] Based on the coplanar arrangement of the extension parts 20 located on the same side of the plate body 10, it is convenient for the formation of the insulating cover plate and improves the aesthetics of the insulating cover plate.

[0048] For example, the plate body 10 is rectangular, and the number of the extension parts 20 is set to 4, and two extension parts 20 are arranged at intervals on each side of the plate body 10. The two extension parts 20 located on the same side in the width direction of the plate body 10 are arranged coplanarly.

[0049] In some embodiments, the extension part 20 is integrally formed on the plate body 10. For example, the extension part 20 can be arranged on the side of the plate body 10 facing the housing 30 by means of integral injection molding. The extension part 20 can also be spray-molded on the side of the plate body 10 facing the housing 30.

[0050] Taking the plate body 10 being set as rectangular as an example. During the production process, plastics will be formed on the opposite sides in the length direction of the plate body 10 respectively, and the plastics can be used to be clamped to the housing 30 to realize the connection between the plate body 10 and the housing 30. During the formation of the two plastics, extension parts 20 with a certain length can be spray-molded on the opposite sides in the width direction of the plate body 10 respectively by means of spray casting. Thus, a connection structure of the integrally formed extension part 20 and the plate body 10 can be formed, and the extension part 20 extends along the length direction of the plate body 10.

[0051] Among them, the extension part 20 can adopt PET plastic (Polyethylene terephthalate). Of course, the extension part 20 can also be made of other insulating materials as long as it can play an insulating connection effect on the tab and the plate body 10.

[0052] The embodiment of the present application also provides a top cover assembly. The top cover assembly includes the insulating cover plate in the foregoing embodiment.

[0053] In this embodiment, by arranging the extension part 20 on the plate body 10, after the plate body 10 is covered on the housing 30, the extension part 20 can be clamped between the wall surface of the housing 30 and the tab of the electrode assembly, so as to isolate the housing 30 from the tab by using the extension part 20 and prevent an electrical connection from being formed between the tab and the housing 30. At the same time, based on the inclined arrangement of the extension part 20, the extension part 20 can also play a role of clamping and fixing to a certain extent, so that the plate body 10 is firmly covered on the housing 30.

[0054] In some embodiments, in addition to including the insulating cover plate in the foregoing embodiment, the top cover assembly can also include components such as a top cover sheet and a pole column.

[0055] An embodiment of the present application further provides a single battery cell. The single battery cell includes a housing 30, an electrode assembly, and a top cover assembly. Among them, the electrode assembly is disposed in the housing 30, and the electrode assembly is connected with a tab. The plate body 10 covers the housing 30, and the extension portion 20 extends into the housing 30 and is clamped between the wall surface of the housing 30 and the tab.

[0056] In this embodiment, by providing the extension portion 20 on the plate body 10, after the plate body 10 covers the housing 30, the extension portion 20 can be clamped between the wall surface of the housing 30 and the tab located on the electrode assembly, so as to isolate the housing 30 from the tab by using the extension portion 20 and prevent an electrical connection from being formed between the tab and the housing 30. At the same time, based on the inclined setting of the extension portion 20, the extension portion 20 can also play a role of clamping and fixing to a certain extent, so that the plate body 10 is firmly covered on the housing 30.

[0057] As Figures 3 to 5 shown, the extension portion 20 has a certain height, so that the extension portion 20 can extend a certain distance in the housing 30. Specifically, the extension portion 20 can be made to abut against the electrode assembly. Thereby, not only can the insulation connection between the tab and the housing 30 be ensured through the extension portion 20, but also the position of the electrode assembly can be fixed by using the extension portion 20 to prevent the electrode assembly from shaking.

[0058] Please continue to refer to Figures 3 to 5 , based on the inclined setting of the extension portion 20, the end of the extension portion 20 away from the plate body 10 can also abut against the wall surface of the housing 30, and also abut against the tab and the electrode assembly. Thus, after the extension portion 20 is clamped between the tab and the wall surface of the housing 30, the extension portion 20 can also apply a force to the tab and the electrode assembly to further lock the position of the electrode assembly and prevent the electrode assembly from shaking.

[0059] In some embodiments, the inclination angle of the extension portion 20 is α, satisfying: 2° ≤ α ≤ 8°.

[0060] In some embodiments, the extension portion 20 is integrally formed with the plate body 10.

[0061] As Figure 2 and Figure 3 shown, in some embodiments, the number of the extension portions 20 is set to at least two, and at least two extension portions 20 are respectively located on opposite sides of the plate body 10. Among them, in the direction perpendicular to the extension direction of the side edge 110 of the plate body 10, for two opposite extension portions 20 on the plate body 10, at the end away from the plate body 10, the distance between the sides of the two extension portions 20 facing away from each other is D1, and the width inside the housing 30 is D2, satisfying: D1 = D2.

[0062] Since the electrode assembly is provided with tabs on both its opposite sides, accordingly, the number of the extending portions 20 is set to at least two, and they are respectively located on the opposite sides of the plate body 10. Then, the extending portions 20 located on both sides of the plate body 10 can respectively abut against the tabs located on both sides of the electrode assembly, realizing the insulating connection between each tab and the housing 30.

[0063] For example, the plate body 10 is rectangular. For the two extending portions 20 in the same width direction, they will have a near side and a far side at the end away from the plate body 10. The distance D1 between the far sides of the two extending portions 20 is equal to the width D2 inside the housing 30. Accordingly, the far sides of the two extending portions 20 can respectively abut against the wall surfaces on the opposite sides of the housing 30. At this time, the extending portions 20 play a role of clamping and fixing to a certain extent, making the plate body 10 firmly cover the housing 30.

[0064] As Figure 2 and Figure 3 shown, in some embodiments, the height inside the housing 30 is H1, the height of the electrode assembly is H2, and the height of the extending portion 20 is H3, satisfying: H3 = H1 - H2.

[0065] Among them, the height H2 of the electrode assembly does not include the height of the tab. It can be understood that at the upper end of the electrode assembly, the tab needs to be bent, and the bent tab fits on the upper surface of the electrode assembly. After the aforementioned plate body 10 covers the housing 30, it mainly makes an insulating connection between the bent portion of the tab and the housing 30.

[0066] Making the height H3 of the extending portion 20 equal to the difference between the height H1 inside the housing 30 and the height H2 of the electrode assembly can make the lower surface of the extending portion 20 abut against the upper surface of the electrode assembly. Accordingly, not only can the insulating connection between the tab and the housing 30 be ensured through the extending portion 20, but also the position of the electrode assembly can be fixed by using the extending portion 20 to prevent the electrode assembly from shaking.

[0067] In some embodiments, the side of the extending portion 20 away from the housing 30 can also abut against the tab. Accordingly, the housing 30 can cooperate with the extending portion 20 to apply a force to the tab and the electrode assembly, thereby further locking the position of the electrode assembly to prevent the electrode assembly from shaking.

[0068] As Figure 4As shown, in some embodiments, the plate body 10 is rectangular. The length inside the housing 30 is L1. At least two extension parts 20 are provided on each side of the plate body 10 in its width direction. For at least two extension parts 20 on the same side, the at least two extension parts 20 are spaced apart along the length direction of the plate body 10. Among them, the extension parts 20 at both ends of the plate body 10 in the length direction are the first extension part and the last extension part respectively, and the distance between the first extension part and the last extension part is L2, satisfying: L1 > L2.

[0069] For example, one extension part 20 is provided on each side of the plate body 10 in the width direction, and each extension part 20 corresponds to the tab area of the electrode assembly. Thus, the extension parts 20 on each side can respectively achieve the effect of insulating connection between the tab on that side and the housing 30. It should be noted that along the length direction of the housing 30, the electrode assembly has no tab areas at positions close to both sides of the housing 30, and the remaining areas are tab areas.

[0070] For example, a plurality of extension parts 20 are provided on each side of the plate body 10 in the width direction. For all the extension parts 20 on each side, the extension parts 20 are spaced apart along the length direction of the plate body 10, and each extension part 20 can correspond to a tab. Thus, each tab is respectively insulatedly connected to the housing 30 through an extension part 20.

[0071] Among them, the distance L2 between the first extension part and the last extension part is made smaller than the length L1 inside the housing 30, so as to ensure that the plate body 10 connected with a plurality of extension parts 20 can cover the housing 30.

[0072] At the same time, making the distance L2 between the first extension part and the last extension part smaller than the length L1 inside the housing 30 can form an area on the plate body 10 where no extension part 20 is provided, and this area can correspond to the tabless area of the electrode assembly. Since there are no tabs in the tabless area of the electrode assembly, no extension part 20 is provided in the area corresponding to this position on the plate body 10, which has the effects of saving materials and reducing weight, can save the production cost of the plate body 10 assembly, and is convenient for the transportation and handling of the plate body 10 assembly.

[0073] As Figure 5 As shown, in some embodiments, the plate body 10 is rectangular. The length inside the housing 30 is L1. One extension part 20 is provided on each side of the plate body 10 in its width direction, and the length of each extension part 20 is L3, satisfying: L1 > L3.

[0074] It can be understood that based on making the length L3 of the extension part 20 smaller than the length L1 inside the housing 30, it is ensured that the plate body 10 connected with the extension part 20 can cover the housing 30.

[0075] Meanwhile, by making the length L3 of the extension part 20 less than the length L1 inside the housing 30, an area without the extension part 20 can be formed on the plate body 10, and this area can correspond to the tabless area of the electrode assembly. Since there are no tabs provided in the tabless area of the electrode assembly, therefore, no extension part 20 is provided in the area corresponding to this position on the plate body 10, which has the effect of saving materials and reducing weight, can save the production cost of the plate body 10 assembly, and is convenient for the transportation and handling of the plate body 10 assembly.

[0076] As Figure 4 and Figure 5 shown, in some embodiments, along the extension direction of the side edge 110 of the plate body 10, the extension part 20 is spaced from the wall surface of the housing 30, and the spacing is D3, satisfying: 20 mm ≤ D3 ≤ 30 mm.

[0077] It can be understood that, along the extension direction of the side edge 110 of the plate body 10, the spacing D3 between the extension part 20 and the wall surface of the housing 30 corresponds to the tabless area of the electrode assembly. Since there are no tabs provided in the tabless area of the electrode assembly, therefore, no extension part 20 is provided in the area corresponding to this position on the plate body 10, which has the effect of saving materials and reducing weight, can save the production cost of the plate body 10 assembly, and is convenient for the transportation and handling of the plate body 10 assembly.

[0078] For example, the plate body 10 is rectangular. Along the length direction of the plate body 10, the spacing D3 between the extension part 20 and the wall surface of the housing 30 can be set to 20 mm, 25 mm, 30 mm, or any value between any two of them. The spacing D3 between the extension part 20 and the wall surface of the housing 30 can be reasonably selected based on different types of battery cell monomers, the model of the housing 30, etc., as long as the spacing D3 between the extension part 20 and the wall surface of the housing 30 corresponds to the tabless area of the electrode assembly.

[0079] In some embodiments, the plate body 10 is rectangular. The thickness of the extension part 20 is D5, the thickness of the electrode assembly is D6, and the width inside the housing 30 is D2. Satisfying: D5 < (D2 - D6) / 2. It can be understood that, in order for the plate body 10 to be able to cover the housing 30, the sum of the thicknesses of the two extension parts 20 and the thickness of the electrode assembly in the same width direction needs to be less than or equal to the width inside the housing 30. In the embodiments of the present application, by designing the sum of the thicknesses of the two extension parts 20 and the thickness of the electrode assembly in the same width direction to be less than the width inside the housing 30, it can be convenient for the plate body 10 to be quickly snapped into the cavity of the housing 30 when covering, realizing rapid assembly.

[0080] The above has introduced the embodiments of the present utility model in detail. Specific examples are used herein to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those skilled in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. An insulating cover plate, applied to the top cover assembly of a battery cell, characterized in that: include: board body; The extension part is connected to the plate body, and the extension part is led out from a position of the plate body away from the side edge, and is inclined toward a direction close to the side edge.

2. The insulating cover plate according to claim 1, characterized in that: The inclination angle of the extension portion is α, which satisfies: 2°≤α≤8°.

3. The insulating cover plate according to claim 1, characterized in that: The extension portion extends along a side edge of the plate body.

4. The insulating cover plate according to claim 1, characterized in that: The number of the extension parts is set to an even number greater than 2, and the extension parts are respectively located on two opposite sides of the plate body, wherein the extension parts located on the same side of the plate body are coplanarly arranged.

5. The insulating cover plate according to any one of claims 1 to 4, characterized in that: The extension portion is integrally formed with the plate body.

6. A top cover assembly, characterized in that: It comprises the insulating cover plate as described in any one of claims 1 to 5.

7. A battery cell, characterized in that: include: case; An electrode assembly is disposed in the housing, and the electrode assembly is connected with a tab; The top cover assembly as claimed in claim 6; The plate body covers the shell, the extension portion extends into the shell, and is sandwiched between the shell wall surface of the shell and the pole ear.

8. The battery cell according to claim 7, characterized in that: The number of the extension parts is set to at least two, and at least two of the extension parts are respectively located on opposite sides of the plate body, wherein, in the extension direction perpendicular to the side of the plate body, for two opposite extension parts on the plate body, at the end away from the plate body, the distance between the two extension parts facing away from each other is D1, and the width inside the shell is D2, satisfying: D1=D2.

9. The battery cell according to claim 7, characterized in that: The height of the interior of the shell is H1, the height of the electrode assembly is H2, and the height of the extension portion is H3, satisfying: H3 = H1 - H2.

10. The battery cell according to claim 7, characterized in that: Along the extension direction of the side of the plate body, the extension portion is spaced apart from the shell wall surface of the shell, and the spacing is D3, satisfying: 20 mm≤D3≤30 mm.

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