Battery cell

Abstract

The utility model provides a battery cell and relates to the technical field of batteries. The battery cell comprises a shell, a positive electrode cover plate, a negative electrode cover plate, a lower plastic part, a negative electrode column, a fixing assembly and a plurality of electrode groups, each electrode group comprises a positive electrode lug and a negative electrode lug, the plurality of electrode groups are arranged along the length direction, the positive electrode lug in one of two adjacent electrode groups is connected with the negative electrode lug in the other electrode group, the fixing assembly is arranged between the two adjacent electrode groups, and the fixing assembly is arranged between the two adjacent electrode groups. Every two adjacent pole groups are attached to the corresponding fixing assembly, and the ends, in the width direction, of the fixing assemblies are not higher than the pole groups. The negative pole is fixed on the lower plastic part, the lower plastic part is attached to the negative cover plate, the negative tab in the pole group close to the negative cover plate is connected with the negative pole, and the positive tab in the pole group close to the positive cover plate is connected with the positive cover plate. Therefore, a plurality of pole groups with relatively small lengths are used for replacing a pole group with relatively large length, the length of a single pole group is relatively small, and the risks of wrinkling, deformation, channeling and breakage of the pole groups are reduced, so that the reject ratio of the battery cell is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular to an electric core. Background Art

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields. As an important part of the electric core, the electrode assembly directly affects the quality of the electric core.

[0003] With the optimization of the structure of the electric core, electric cores with a larger length have emerged. However, as the length of the electric core increases, the length of the electrode assembly of the electric core also increases, which increases the risks of wrinkling, deformation, layer displacement, and fracture of the electrode assembly, and the defective rate of the electric core rises. Summary of the Utility Model

[0004] In view of this, the present application provides an electric core to solve the problem that as the length of the electric core increases, the length of the electrode assembly increases, which increases the risks of wrinkling, deformation, layer displacement, and fracture of the electrode assembly, and the defective rate of the electric core rises.

[0005] The present application provides an electric core, which includes a housing, a positive electrode cover plate, a negative electrode cover plate, a lower plastic part, a negative electrode column, a fixing component, and a plurality of electrode assemblies. Any one of the electrode assemblies includes a positive electrode tab and a negative electrode tab. The plurality of electrode assemblies are arranged along the length direction of the electrode assembly. The positive electrode tab in one of the adjacent two electrode assemblies is connected to the negative electrode tab in the other electrode assembly. The fixing component is arranged between any two adjacent electrode assemblies. The two opposite surfaces of the two adjacent electrode assemblies are both attached to the fixing component. The end of the fixing component in the width direction of the electrode assembly is not higher than the electrode assembly.

[0006] The negative electrode column is fixed on the lower plastic part. The lower plastic part is attached to the negative electrode cover plate. The negative electrode tab in the electrode assembly close to the negative electrode cover plate is connected to the negative electrode column. The positive electrode tab in the electrode assembly close to the positive electrode cover plate is connected to the positive electrode cover plate.

[0007] Preferably, the positive electrode cover plate includes a cover plate body and a conductive part. The conductive part protrudes from the side of the cover plate body facing away from the electrode assembly. The cover plate body is connected to the positive electrode tab in the electrode assembly close to the positive electrode cover plate.

[0008] Preferably, the ratio of the size of the cover plate body in the length direction to the size of the conductive part in the length direction is greater than 0.6 and less than 1.5.

[0009] Preferably, the distance between the conductive part and the edge of the cover plate body in the thickness direction of the electrode assembly is greater than 2.5 mm.

[0010] Preferably, the battery cell further includes two first explosion-proof valves. The cover plate body includes a first installation opening, and the negative electrode cover plate includes a second installation opening. The two first explosion-proof valves are respectively arranged on the first installation opening and the second installation opening.

[0011] Preferably, the battery cell further includes two second explosion-proof valves. Two third installation openings are formed in the housing. The two second explosion-proof valves are arranged on the two third installation openings. Two ends of a fixing component in the width direction respectively face the two second explosion-proof valves.

[0012] Preferably, the fixing component includes two fixing members. Each fixing member includes a fitting plane and a receiving groove. The receiving groove is recessed from the fitting plane into the interior of the fixing member. The two fitting planes are in contact with each other, and the two receiving grooves enclose a receiving space. The positive electrode tabs in one of the adjacent electrode groups and the negative electrode tabs in the other adjacent electrode group both extend into the receiving space.

[0013] Preferably, each fixing member further includes a connecting plane and a connecting groove. The connecting plane and the fitting plane are respectively located on two opposite sides of the fixing member. The connecting groove is recessed from the connecting plane into the interior of the fixing member.

[0014] Vent holes are formed on both sides of the fixing member in the width direction. Both of the two vent holes communicate with the connecting groove, and the two vent holes respectively face the two second explosion-proof valves.

[0015] Preferably, the ratio of the area of the surface of the second explosion-proof valve facing the fixing component to the area of the two vent holes facing the same second explosion-proof valve is greater than 1 / 2.

[0016] Preferably, the battery cell includes a support plate. The support plate is connected to the electrode group close to the negative electrode cover plate, and the negative electrode tab in the electrode group close to the negative electrode cover plate passes through the support plate.

[0017] In the battery cell of the present application, the battery cell includes a housing, a positive electrode cover plate, a negative electrode cover plate, a lower plastic part, a negative electrode post, a fixing component, and a plurality of electrode groups. Any one of the electrode groups includes a positive electrode tab and a negative electrode tab. The plurality of electrode groups are arranged along the length direction of the electrode group. In two adjacent electrode groups, the positive electrode tab in one electrode group is connected to the negative electrode tab in the other electrode group. A fixing component is provided between any two adjacent electrode groups. The two opposite surfaces of two adjacent electrode groups are both attached to the fixing component. The end part of the fixing component in the width direction of the electrode group is not higher than the electrode group. The negative electrode post is fixed on the lower plastic part. The lower plastic part is attached to the negative electrode cover plate. The negative electrode tab in the electrode group close to the negative electrode cover plate is connected to the negative electrode post. The positive electrode tab in the electrode group close to the positive electrode cover plate is connected to the positive electrode cover plate. The fixing component can connect two adjacent electrode groups, and further connect a plurality of electrode groups. In this way, a plurality of electrode groups with smaller lengths are used to replace one electrode group with a larger length. The length of a single electrode group is smaller, and the risks of electrode group wrinkling, deformation, layer shifting, and fracture are reduced, thereby reducing the defective rate of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0019] Figure 1 An exploded view of the battery cell showing the embodiments of the present utility model;

[0020] Figure 2 A schematic plan view of the battery cell showing the embodiments of the present utility model;

[0021] Figure 3 Showing Figure 2 The cross-sectional view obtained by cutting the battery cell in [[ ]] along A-A';

[0022] Figure 4 Showing Figure 2 The cross-sectional view obtained by cutting the battery cell in [[ ]] along B-B';

[0023] Figure 5 The cross-sectional view showing the location of the fixing component of the battery cell;

[0024] Figure 6 The schematic structural view showing the support plate;

[0025] Figure 7 The schematic structural view showing the fixing member;

[0026] Figure 8 The three-dimensional structural view showing the fixing component;

[0027] Figure 9 Shows a three-dimensional structural schematic diagram of the positive electrode cover plate;

[0028] Figure 10 Shows a planar structural schematic diagram of a perspective of the positive electrode cover plate;

[0029] Figure 11 Shows a planar structural schematic diagram of another perspective of the positive electrode cover plate.

[0030] Icon: 1 - electrode group; 11 - positive electrode tab; 12 - negative electrode tab; 2 - insulating film; 3 - support plate; 31 - through hole; 4 - fixing assembly; 41 - fixing member; 411 - fitting plane; 412 - receiving groove; 413 - first plane; 414 - second plane; 415 - connecting groove; 416 - connecting plane; 417 - vent hole; 42 - receiving space; 51 - positive electrode cover plate; 511 - cover plate body; 512 - conductive member; 52 - negative electrode cover plate; 61 - first explosion-proof valve; 62 - second explosion-proof valve; 7 - side plate; 8 - housing; 81 - first plate; 82 - second plate; 91 - lower plastic part; 92 - negative electrode post; L1 - length direction; L2 - width direction; L3 - thickness direction. Detailed implementation manners

[0031] The following detailed implementation manners are provided to help the reader obtain a comprehensive understanding of the methods, devices, and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein. Rather, changes that will be apparent after understanding the disclosure of the present application can be made, except for operations that must occur in a specific order. In addition, descriptions of features known in the art may be omitted for the sake of clarity and brevity.

[0032] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, devices, and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0033] Throughout the specification, when an element (such as, a layer, a region, or a substrate) is described as being "on" another element, "connected to" another element, "coupled to" another element, "above" another element, or "covering" another element, it can be directly "on" the other element, "connected to" the other element, "coupled to" the other element, "above" the other element, or "covering" the other element, or there can be one or more other elements intervening therebetween. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly coupled to" another element, "directly above" another element, or "directly covering" another element, there can be no other elements intervening therebetween.

[0034] As used herein, the term "and / or" includes any one of the listed related items and any combination of any two or more of them.

[0035] Although terms such as "first", "second", and "third" may be used herein to describe various components, elements, regions, layers, or parts, these components, elements, regions, layers, or parts are not limited by these terms. Rather, these terms are only used to distinguish one component, element, region, layer, or part from another. Thus, a first component, element, region, layer, or part described in the examples herein may also be referred to as a second component, element, region, layer, or part without departing from the teachings of the examples.

[0036] For ease of description, spatial relationship terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another as shown in the figures. Such spatial relationship terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "above" or "upper" relative to another element will then be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientations of "above" and "below" depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 910 degrees or in other orientations), and the spatial relationship terms used herein will be interpreted accordingly.

[0037] The terms used herein are for describing various examples only and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. The terms "comprising", "including" and "having" enumerate the stated features, quantities, operations, components, elements and / or combinations thereof that exist, but do not preclude the existence or addition of one or more other features, quantities, operations, components, elements and / or combinations thereof.

[0038] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings, but include changes in shape that occur during manufacturing.

[0039] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible, as will be apparent after understanding the disclosure of the present application.

[0040] The following will be combined with Figures 1 to 11 to describe the battery cell of the present application. In Figures 1 to 11 , the length direction L1, width direction L2 and thickness direction L3 of the electrode group are perpendicular to each other in pairs.

[0041] As Figures 1 to 5 shown, the battery cell includes a housing 8, a positive cover plate 51, a negative cover plate 52, a lower plastic part 91, a negative terminal 92, a fixing component 4 and a plurality of electrode groups 1. Any one of the electrode groups 1 includes a positive tab 11 and a negative tab 12. The plurality of electrode groups 1 are arranged along the length direction L1 of the electrode group 1. The positive tab 11 in one of the adjacent two electrode groups 1 is connected to the negative tab 12 in the other electrode group 1. A fixing component 4 is provided between any two adjacent electrode groups 1. The two opposite surfaces of the two adjacent electrode groups 1 are both in contact with the fixing component 4. The end of the fixing component 4 in the width direction L2 of the electrode group 1 is not higher than the electrode group 1. The negative terminal 92 is fixed on the lower plastic part 91. The lower plastic part 91 is in contact with the negative cover plate 52. The negative tab 12 in the electrode group 1 close to the negative cover plate 52 is connected to the negative terminal 92. The positive tab 11 in the electrode group 1 close to the positive cover plate 51 is connected to the positive cover plate 51. Through the fixing component 4, two adjacent electrode groups 1 can be connected, and further, a plurality of electrode groups 1 can be connected. In this way, by replacing one electrode group 1 with a larger length with a plurality of electrode groups 1 with smaller lengths, the length of a single electrode group 1 is smaller, and the risks of wrinkling, deformation, layer shifting and fracture of the electrode group 1 are reduced, thereby reducing the defective rate of the battery cell.

[0042] In addition, the position of the fixing component 4 corresponds to the second explosion-proof valve 62 described below. The end of the fixing component 4 in the width direction L2 of the electrode group 1 is not higher than the electrode group 1, which can avoid damaging the second explosion-proof valve 62.

[0043] In an embodiment of the present application, as Figures 9 to 11 shown, the positive electrode cover plate 51 includes a cover plate body 511 and a conductive member 512. The conductive member 512 protrudes from a side of the cover plate body 511 facing away from the electrode group 1. The cover plate body 511 is connected to the positive electrode tab 11 in the electrode group 1 close to the positive electrode cover plate 51. In this way, the positive electrode tab 11 in the electrode group 1 close to the positive electrode cover plate 51 is directly welded to the cover plate body 511, canceling other intermediate structures, so that the space that the electrode group 1 can occupy is increased, thereby improving the capacity density of the battery cell. Optionally, the cover plate body 511 can be a light aluminum sheet, and the conductive member 512 can be formed by stamping the cover plate body 511.

[0044] Preferably, the ratio of the dimension b of the cover plate body 511 in the length direction L1 to the dimension a of the conductive member 512 in the length direction L1 is greater than 0.6 and less than 1.5, that is, 0.6 < b / a < 1.5.

[0045] In an embodiment of the present application, as Figure 1 shown, the battery cell further includes side plates 7 and a housing 8. Two side plates 7 are correspondingly arranged for each electrode group 1. Two surfaces of the electrode group 1 facing away from each other in the width direction L2 are respectively attached to the two side plates 7. Through the two side plates 7, the two sides of the electrode group 1 in the width direction L2 can be protected. The insulating film 2 covers a plurality of electrode groups 1 and a plurality of side plates 7, and the housing 8 covers the insulating film 2, thereby realizing insulation between the electrode group 1 and the housing 8.

[0046] Optionally, the outside of the housing 8 can also be covered with an insulating film, and a part of the insulating film extends to the location of the cover plate body 511. As Figure 11 shown, the distance c between the conductive member 512 and the edge of the cover plate body 511 in the thickness direction L3 of the electrode group 1 is greater than 2.5 mm, that is, c > 2.5 mm, which can prevent the insulating film 2 from warping.

[0047] As Figure 1 , Figure 2 and Figure 3 shown, the battery cell further includes two first explosion-proof valves 61. The cover plate body 511 includes a first installation opening, and the negative electrode cover plate 52 includes a second installation opening. The two first explosion-proof valves 61 are respectively arranged on the first installation opening and the second installation opening. When thermal runaway occurs, gas can be discharged through the first explosion-proof valves 61.

[0048] In an embodiment of the present application, the housing 8 includes two first plates 81 and two second plates 82. The first plates 81 and the second plates 82 are alternately arranged. The first plates 81 are perpendicular to the width direction L2, and the second plates 82 are perpendicular to the thickness direction L3. The positive electrode cover plate 51 and the negative electrode cover plate 52 are respectively arranged at both ends of the housing 8 in the length direction L1.

[0049] Further, third mounting openings are formed in both of the two first plates 81; the battery cell includes two second explosion-proof valves 62, and the two second explosion-proof valves 62 are respectively disposed on the two third mounting openings. Two ends of a fixing assembly 4 in the width direction L2 respectively face the two second explosion-proof valves 62. As Figure 3 shown, the gas in the middle of the battery cell can be quickly discharged through the two second explosion-proof valves 62, and the gas on both sides can be quickly discharged through the two first explosion-proof valves 61. Through the cooperation of the two first explosion-proof valves 61 and the two second explosion-proof valves 62, the exhaust efficiency can be improved, the airway stroke can be shortened, and thus the safety of the battery cell can be improved.

[0050] In the embodiment of the present application, as Figure 4 、 Figure 5 、 Figure 7 and Figure 8 shown, the fixing assembly 4 includes two fixing members 41. The fixing member 41 includes a first plane 413 and a second plane 414 that face away from each other in the length direction L1. The two first planes 413 of the two fixing members 41 are attached to the same electrode group 1, and the two second planes 414 of the two fixing members 41 are attached to the other electrode group 1. The fixing assembly 4 is assembled by the two fixing members 41, which enables the two fixing members 41 to be installed after the positive electrode tab 11 and the negative electrode tab 12 are welded, improving the convenience of welding the positive electrode tab 11 and the negative electrode tab 12.

[0051] Further, the fixing member 41 includes a fitting plane 411 and a receiving groove 412. The fitting plane 411 is perpendicular to the thickness direction L3. The receiving groove 412 is recessed from the fitting plane 411 into the interior of the fixing member 41, and both ends of the receiving groove 412 are open in the length direction L1. The two fitting planes 411 are attached, and the two receiving grooves 412 enclose a receiving space 42. Both ends of the receiving space 42 are open in the length direction L1, so that the positive electrode tab 11 in one electrode group 1 and the negative electrode tab 12 in the other adjacent electrode group 1 can extend into the receiving space 42, and the positive electrode tab 11 and the negative electrode tab 12 are welded. The welding portion of the positive electrode tab 11 and the negative electrode tab 12 is located in the receiving space 42. In this way, the connection portion of the positive electrode tab 11 and the negative electrode tab 12 can be protected by the two fixing members 41, avoiding damage to the connection portion of the positive electrode tab 11 and the negative electrode tab 12 due to impact.

[0052] In addition, the fixing member 41 further includes a connecting plane 416 and a connecting groove 415. The connecting plane 416 and the fitting plane 411 are respectively located on two opposite sides of the fixing member 41, and the connecting groove 415 is recessed from the connecting plane 416 into the interior of the fixing member 41. Vent holes 417 are formed on both sides of the fixing member 41 in the width direction L2. Both of the two vent holes 417 communicate with the connecting groove 415, and the two vent holes 417 face the two second explosion-proof valves 62 respectively. During thermal runaway, the gas in the middle can quickly converge to the location of the second explosion-proof valve 62 through the connecting groove 415 and the vent holes 417, so as to be discharged from the second explosion-proof valve 62, thereby improving the safety of the battery cell.

[0053] Preferably, the ratio of the area of the surface of the second explosion-proof valve 62 facing the fixing assembly 4 to the area of the two vent holes 417 facing the same second explosion-proof valve 62 is greater than 1 / 2, so that the gas in the middle can be quickly discharged through the second explosion-proof valve 62.

[0054] As Figure 1 and Figure 6 shown, the battery cell further includes a support plate 3. The positive electrode tab 11 in the electrode group 1 close to the positive electrode cover plate 51 is connected to the positive electrode cover plate 51. The support plate 3 is connected to the electrode group 1 close to the negative electrode cover plate 52. A through hole 31 is formed in the support plate 3. The negative electrode tab 12 of the electrode group 1 close to the negative electrode cover plate 52 passes through the through hole 31 and is connected to the negative electrode cover plate 52. When the electrode group 1 is inserted into the casing, the support plate 3 can be pushed to push multiple electrode groups 1 into the casing 8, ensuring balanced thrust when the electrode group 1 is inserted into the casing. Optionally, the support plate 3 can be fixed to the electrode group 1 by means of bonding, hot melting, etc.

[0055] Optionally, the number of the electrode groups 1 in the battery cell can be selected, such as two, three, four or more. Taking the number of the electrode groups 1 being two as an example, at this time, the battery cell includes a fixing assembly 4. The fixing assembly 4 is arranged between the two electrode groups 1 and is in contact with the two electrode groups 1. The positions of the two second explosion-proof valves 62 correspond to the two ends of the fixing assembly 4 in the thickness direction L3.

[0056] The battery cell of the present application replaces one electrode group 1 with a larger length with multiple electrode groups 1 with smaller lengths. The length of a single electrode group 1 is smaller, reducing the risks of the electrode group 1 wrinkling, deforming, delaminating, and breaking, thereby reducing the defective rate of the battery cell.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and 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 invention.

Claims

1. A battery cell, characterized in that, The battery cell includes a housing, a positive electrode cover plate, a negative electrode cover plate, a lower plastic part, a negative electrode post, a fixing assembly, and a plurality of electrode groups. Any one of the electrode groups includes a positive electrode tab and a negative electrode tab. The plurality of electrode groups are arranged along the length direction of the electrode groups. In two adjacent electrode groups, the positive electrode tab in one electrode group is connected to the negative electrode tab in the other electrode group. The fixing assembly is provided between any two adjacent electrode groups. Two opposite surfaces of two adjacent electrode groups are both in contact with the fixing assembly. The end of the fixing assembly in the width direction of the electrode group is not higher than the electrode group. The negative electrode post is fixed on the lower plastic part. The lower plastic part is in contact with the negative electrode cover plate. The negative electrode tab in the electrode group close to the negative electrode cover plate is connected to the negative electrode post. The positive electrode tab in the electrode group close to the positive electrode cover plate is connected to the positive electrode cover plate.

2. The battery cell according to claim 1, characterized in that, The positive electrode cover plate includes a cover plate body and a conductive member. The conductive member protrudes from a side of the cover plate body facing away from the electrode group. The cover plate body is connected to the positive electrode tab in the electrode group close to the positive electrode cover plate.

3. The battery cell according to claim 2, wherein, The ratio of the size of the cover plate body in the length direction to the size of the conductive member in the length direction is greater than 0.6 and less than 1.

5.

4. The battery cell according to claim 2, characterized in that, The distance between the conductive member and the edge of the cover plate body in the thickness direction of the electrode group is greater than 2.5 mm.

5. The battery cell according to claim 2, characterized in that, The battery cell further includes two first explosion-proof valves. The cover plate body includes a first installation opening. The negative electrode cover plate includes a second installation opening. The two first explosion-proof valves are respectively arranged on the first installation opening and the second installation opening.

6. The battery cell according to claim 1, wherein The battery cell further includes two second explosion-proof valves. Two third installation openings are formed on the housing. The two second explosion-proof valves are arranged on the two third installation openings. Two ends of a fixing assembly in the width direction respectively face the two second explosion-proof valves.

7. The battery cell according to claim 6, characterized in that, The fixing assembly includes two fixing members. The fixing member includes a fitting plane and a receiving groove. The receiving groove is recessed from the fitting plane into the interior of the fixing member. The two fitting planes are in contact with each other. The two receiving grooves enclose a receiving space. The positive electrode tab in one electrode group and the negative electrode tab in the other electrode group among two adjacent electrode groups both extend into the receiving space.

8. The battery cell according to claim 7, characterized in that, The fixing member further includes a connecting plane and a connecting groove. The connecting plane and the fitting plane are respectively located on two opposite sides of the fixing member. The connecting groove is recessed from the connecting plane into the interior of the fixing member. Vent holes are formed on both sides of the fixing member in the width direction. The two vent holes are both communicated with the connecting groove. The two vent holes respectively face the two second explosion-proof valves.

9. The battery cell according to claim 8, wherein, The ratio of the area of the surface of the second explosion-proof valve facing the fixing assembly to the area of the two vent holes facing the same second explosion-proof valve is greater than 1 / 2.

10. The battery cell according to claim 1, characterized in that, The battery cell includes a support plate. The support plate is connected to the electrode group close to the negative electrode cover plate. The negative electrode tab in the electrode group close to the negative electrode cover plate passes through the support plate.

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