Battery cell and battery

Abstract

The utility model provides a kind of electric core and battery, it is related to battery technical field, including pole piece, first diaphragm and first adhesive tape.First diaphragm and pole piece are laminated and are wound to form winding structure;Tab includes the connecting portion and the extension, and the extension is relative to first diaphragm and pole piece and extends along the axial direction of winding structure;Connecting portion is located between first diaphragm and pole piece, and is connected to one side in the thickness direction of pole piece;First adhesive tape includes first adhesive, first substrate and second adhesive, first substrate is located between first diaphragm and tab, and is used to cover connecting portion;First substrate has first adhesive surface and second adhesive surface, first adhesive surface and second adhesive surface are respectively located in different side of first substrate in the thickness direction of first substrate, first adhesive is connected to first adhesive surface, and is connected to pole piece and / or tab;Second adhesive is connected to second adhesive surface and is connected to first diaphragm.The electric core and battery in the utility model embodiment, safety performance is stronger.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to battery cells and batteries. Background Technology

[0002] In related technologies, the tabs welded to the electrode sheets are prone to producing burrs that can pierce the separator. Therefore, some technologies attach adhesive tape to one side of the electrode sheet in the thickness direction to prevent burrs from penetrating the separator and increase the safety of the battery cell. However, during long-term use, the adhesive tape in the aforementioned battery cell may slip relative to the electrode sheet due to prolonged immersion in electrolyte, allowing burrs to penetrate the separator and cause safety issues. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a battery cell with enhanced safety performance.

[0004] This utility model also proposes a battery having the above-mentioned battery cell.

[0005] According to the first aspect embodiment of the present invention, the battery cell further includes:

[0006] Electrode;

[0007] A first diaphragm, the first diaphragm and the electrode are stacked and wound to form a wound structure;

[0008] The tab includes a connecting portion and an extension portion connected together, the extension portion extending along the axial direction of the winding structure relative to the first diaphragm and relative to the electrode sheet; the connecting portion is located between the first diaphragm and the electrode sheet, and is connected to one side of the electrode sheet in the thickness direction;

[0009] The first adhesive tape includes a first adhesive layer, a first substrate, and a second adhesive layer. The first substrate is located between the first diaphragm and the electrode tab and is used to cover the side of the connecting portion away from the electrode sheet.

[0010] The first substrate has a first adhesive surface and a second adhesive surface, which are located on different sides of the first substrate in the thickness direction of the first substrate. The first adhesive layer is connected to the first adhesive surface, connected to the electrode sheet, and / or connected to the electrode tab; the second adhesive layer is connected to the second adhesive surface and connected to the first diaphragm.

[0011] The battery cell according to the present invention has at least the following beneficial effects: since the second adhesive layer connected to the second adhesive surface is connected to the first diaphragm, the first adhesive paper can be further fixed between the tab and the electrode, making it less likely to slip relative to the tab during long-term use, and the burrs on the tab are less likely to penetrate the first diaphragm, which is conducive to improving the overall safety of the battery cell.

[0012] According to some embodiments of the present invention, the battery cell has a set width and thickness, the winding structure includes a straight area and a bent area arranged along the width direction of the battery cell; the electrode includes a plurality of straight portions located in the straight area, the plurality of straight portions are stacked along the thickness direction of the battery cell, and the thickness direction of the straight portions is parallel to the thickness direction of the battery cell; the tab is connected to one of the straight portions.

[0013] According to some embodiments of the present invention, the electrode includes a current collector, a first active material layer, and a second active material layer. The connecting portion and the first active material layer are connected to the same side of the current collector, and the first active material layer is connected to the side of the current collector opposite to the connecting portion. Along the thickness direction of the battery cell, the size of the connecting portion is larger than the size of the first active material layer.

[0014] According to some embodiments of the present invention, the second adhesive surface has a first coating area; in the width direction of the battery cell, the first coating area is spaced from the tab, and the first coating area is provided with the second adhesive layer.

[0015] According to some embodiments of the present invention, the second adhesive surface further has a second coating area; in the width direction of the battery cell, the second coating area is spaced apart from the tab, the first coating area and the second coating area are located on different sides of the tab, and the second coating area is provided with the second adhesive layer.

[0016] According to some embodiments of the present invention, along the thickness direction of the battery cell, the size of the connecting portion is L1, and the size of the first active material layer is L2; ​​the thickness direction of the first adhesive paper is parallel to the thickness direction of the first substrate, and the thickness of the first adhesive paper is L.

[0017] Where L≥0.1*L2, and / or L≤10*L2-L1.

[0018] According to some embodiments of the present invention, the second adhesive surface has a third coating area; in the width direction of the battery cell, the third coating area is located between the two sides of the tab, and the third coating area is provided with the second adhesive layer.

[0019] According to some embodiments of the present invention, the electrode includes a current collector, the tab is connected to the current collector, and the first adhesive layer is connected to the current collector.

[0020] According to some embodiments of the present invention, it further includes a second diaphragm and a second adhesive paper, wherein the first diaphragm, the electrode sheet and the second diaphragm are stacked in sequence and wound to form the wound structure;

[0021] The second adhesive tape includes a third adhesive layer, a second substrate, and a fourth adhesive layer. The second substrate is located between the second diaphragm and the electrode sheet and is used to cover the side of the connection portion near the electrode tab. The third adhesive layer is connected to the second substrate and to the electrode sheet, and the fourth adhesive layer is connected to the second substrate and to the second diaphragm.

[0022] The battery according to a second aspect embodiment of the present invention includes a cell as described in any of the above embodiments.

[0023] The battery according to the present invention has at least the following beneficial effects: since the second adhesive layer connected to the second adhesive surface is connected to the first separator, the first adhesive paper can be further fixed between the tab and the electrode, and is less likely to slip relative to the tab during long-term use. The burrs on the tab are less likely to penetrate the first separator, which is conducive to improving the overall safety of the cell and the overall safety of the battery.

[0024] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0026] Figure 1 This is a schematic diagram of the winding of the battery cell according to the first aspect of this utility model;

[0027] Figure 2 for Figure 1 A schematic diagram of the bonding between the intermediate electrode and the diaphragm;

[0028] Figure 3 for Figure 1 A schematic diagram showing the bonding of the intermediate electrode plate, electrode tab, and first adhesive tape;

[0029] Figure 4 for Figure 3 A schematic diagram showing the connection between the intermediate electrode plate and the electrode tab;

[0030] Figure 5 This is a schematic diagram illustrating the bonding of the electrode sheet to the first adhesive paper according to some embodiments of the second aspect of this utility model;

[0031] Figure 6 This is a schematic diagram illustrating the bonding of the electrode sheet and the diaphragm in some embodiments of the third aspect of this utility model;

[0032] Figure 7 This is a schematic diagram illustrating the bonding of the electrode sheet and the diaphragm in some embodiments of the fourth aspect of this utility model;

[0033] Figure 8 This is a schematic diagram illustrating the bonding of the electrode sheet and the diaphragm in some embodiments of the fifth aspect of this utility model;

[0034] Figure 9 This is a schematic diagram illustrating the bonding of the electrode sheet and the diaphragm in some embodiments of the sixth aspect of this utility model;

[0035] Figure 10 for Figure 2 A schematic diagram of the structure of the first adhesive tape.

[0036] Figure label:

[0037] 10 cells;

[0038] Electrode 100, current collector 110, first active material layer 120, second active material layer 130, straight portion 140;

[0039] First diaphragm 200;

[0040] tab 300, connecting part 310, extension part 320;

[0041] First adhesive tape 400, first adhesive layer 410, first substrate 420, first adhesive surface 421, second adhesive surface 422, first coating area 4221, second coating area 4222, third coating area 4223, second adhesive layer 430;

[0042] Straight section 510, curved section 520;

[0043] Second diaphragm 600;

[0044] Second adhesive tape 700, third adhesive layer 710, second substrate 720, fourth adhesive layer 730. Detailed Implementation

[0045] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0046] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0047] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0048] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0049] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0050] Please refer to Figures 1 to 9 As shown, this utility model proposes a battery cell 10, including an electrode 100, a first separator 200, and a first adhesive paper 400.

[0051] Please refer to Figure 1 As shown, the first diaphragm 200 and the electrode 100 of this invention are stacked and wound to form a wound structure. The first diaphragm 200 stacked on the electrode 100 can prevent the electrode 100 from contacting the adjacent electrode 100, thus avoiding short circuit of the cell 10.

[0052] Please refer to Figure 3As shown, the tab 300 of this invention includes a connecting portion 310 and an extension portion 320 connected together. The extension portion 320 extends relative to the first diaphragm 200 and relative to the electrode 100 along the axial direction of the winding structure (i.e., the length direction of the battery cell 10 in the figure). The connecting portion 310 is located between the first diaphragm 200 and the electrode 100, and is connected to one side of the electrode 100 in the thickness direction. The connecting portion 310 connected to the electrode 100 can draw out the electrical energy in the electrode 100 and conduct it to the extension portion 320. The extension portion 320, which extends relative to the first diaphragm 200 and the electrode 100, can be electrically connected to external devices to transmit electrical energy to external devices and realize power supply.

[0053] Please refer to Figure 2 As shown, the first adhesive tape 400 of this utility model includes a first adhesive layer 410, a first substrate 420, and a second adhesive layer 430. The first substrate 420 is located between the first diaphragm 200 and the tab 300, and is used to cover the side of the connecting portion 310 away from the electrode 100. The first substrate 420 has a first adhesive surface 421 and a second adhesive surface 422, which are respectively located on different sides of the first substrate 420 in the thickness direction. By providing the first adhesive layer 410 and the second adhesive layer 430 on both sides of the first substrate 420 in the thickness direction, different structures can be bonded to both sides of the first substrate 420 in the thickness direction.

[0054] For ease of understanding by those skilled in the art, the "covering connection portion 310" mentioned in this utility model specifically refers to the connection portion 310 having a first projection on the surface of the current collector 110 in the thickness direction, and the adhesive tape having a second projection on the surface of the current collector 110 in the thickness direction, with the first projection accommodated within the second projection. The first adhesive tape 400 can prevent direct contact between burrs and the first diaphragm 200 through the covering connection portion 310.

[0055] In the prior art, adhesive tape is bonded to the electrode sheet on one side in the thickness direction and covers the electrode tab, or it is directly bonded to the side of the electrode tab away from the electrode sheet to prevent the burrs on the electrode tab from contacting the diaphragm, so as to avoid the burrs piercing the diaphragm and causing a short circuit due to short connection between the positive and negative electrodes.

[0056] Through practical experience, the inventors discovered that during long-term use, the adhesive tape in the aforementioned battery cell gradually loses its stickiness due to prolonged immersion in the electrolyte, causing the tape to detach. This detached tape slowly slides relative to the tabs during long-term charging and discharging of the battery cell, eventually failing to cover the burrs on the electrode plates. These burrs can then penetrate the separator, causing a short circuit in the battery cell.

[0057] In view of this, please refer to Figure 8As shown, in some embodiments, the first adhesive layer 410 is connected to the first adhesive surface 421 and to the electrode 100; the second adhesive layer 430 is connected to the second adhesive surface 422 and to the first diaphragm 200.

[0058] Please refer to Figure 6 As shown, in some embodiments, the first adhesive layer 410 is connected to the first adhesive surface 421 and to the tab 300; the second adhesive layer 430 is connected to the second adhesive surface 422 and to the first diaphragm 200.

[0059] Please refer to Figure 2 As shown, in some embodiments, the first adhesive layer 410 is connected to the first adhesive surface 421 and to the electrode 100 and the tab 300; the second adhesive layer 430 is connected to the second adhesive surface 422 and to the first diaphragm 200.

[0060] In the above embodiment, since the second adhesive layer 430 connected to the second adhesive surface 422 is connected to the first diaphragm 200, the first adhesive tape 400 can be further fixed between the tab 300 and the electrode 100. During long-term use, it is less likely to slip relative to the tab 300, and the burrs on the tab 300 are less likely to penetrate the first diaphragm 200, which is beneficial to improving the overall safety of the battery cell 10.

[0061] Further, please refer to Figure 1 , Figure 2 As shown, in some embodiments, the battery cell 10 has a set width and thickness, and the winding structure includes a straight region 510 and a bending region 520 arranged along the width direction of the battery cell 10; the electrode 100 includes a plurality of straight portions 140 located in the straight region 510, the plurality of straight portions 140 being stacked along the thickness direction of the battery cell 10, and the thickness direction of the straight portions 140 being parallel to the thickness direction of the battery cell 10; the tab 300 is connected to one of the straight portions 140. Through the above scheme, by placing the tab 300 in the straight portion 140 of the tab 300, the tab 300 can remain straight even after the electrode 100 and the first separator 200 form a winding structure, which is beneficial for the connection of the tab 300 to external devices. Specifically, the straight tab 300 can better fit with external devices when soldering them, thereby ensuring the soldering effect between the tab 300 and the external devices.

[0062] Without departing from the inventive concept of this utility model, those skilled in the art can adjust the specifications of the first adhesive tape 400. For example, please refer to... Figure 2 , Figure 10 As shown, where Figure 10The structure of the first adhesive tape 400 is shown separately. Along the thickness direction of the battery cell 10, the dimension of the connecting portion 310 is L1, and the dimension of the first active material layer 120 is L2. The thickness direction of the first adhesive tape 400 is parallel to the thickness direction of the first substrate 420, and the thickness of the first adhesive tape 400 is L. Those skilled in the art can adjust the size of L based on the sizes of L1 and L2.

[0063] As a preferred embodiment, in some embodiments, L ≥ 0.1 * L². The dimensional relationships in the above embodiments can ensure the strength and adhesion of the first adhesive tape 400 itself, thereby reducing the risk of puncture and detachment.

[0064] In some embodiments, L ≤ 10 * L2 - L1. The dimensional relationships in the above embodiments can reduce the impact of the thickness of the first adhesive tape 400 on the overall thickness of the battery cell 10.

[0065] Further, please refer to Figure 2 , Figure 3 As shown, in some embodiments, the electrode 100 includes a current collector 110, a first active material layer 120, and a second active material layer 130. The connecting portion 310 and the first active material layer 120 are connected to the same side of the current collector 110, and the first active material layer 120 is connected to the side of the current collector 110 opposite to the connecting portion 310. Along the thickness direction of the cell 10, the size of the connecting portion 310 is larger than the size of the first active material layer 120. Through the above scheme, the thicker connecting portion 310 is beneficial to increasing the overall current carrying capacity of the electrode tab 300 and reducing the internal resistance of the cell 10.

[0066] Without departing from the inventive concept of this utility model, those skilled in the art can adjust the structure of the first adhesive tape 400. Exemplarily, in some embodiments, the second adhesive surface 422 has a third coating area 4223; in the width direction of the battery cell 10, the third coating area 4223 is located between the two sides of the tab 300, and the third coating area 4223 is provided with a second adhesive layer 430. By providing the second adhesive layer 430 only in the third coating area 4223, the overall volume of the first adhesive tape 400 can be reduced, thereby reducing the overall volume of the battery cell 10, which is beneficial for improving the energy density of the battery cell 10.

[0067] As mentioned above, the first adhesive layer 410 connected to the first adhesive surface 421 in different embodiments can be connected to different positions. Please refer to the above solutions for further details. Figure 6 , Figure 9As shown, in some embodiments, the size of the connecting portion 310 is larger than the size of the first active material layer 120. The first adhesive layer 410 is connected to the first adhesive surface 421 and to the electrode 100. The first adhesive layer 410 connected to the electrode 100 can utilize the space between the connecting portion 310 and the first active material layer 120 in the thickness direction, which can ensure the bonding strength between the first adhesive tape 400 and the electrode 100 without increasing the overall thickness of the battery cell 10 at the tab 300.

[0068] Further, please refer to Figure 7 As shown, in some embodiments, the second adhesive surface 422 has a first coating area 4221; in the width direction of the cell 10, the first coating area 4221 is spaced from the tab 300, and the first coating area 4221 is provided with a second adhesive layer 430. Through the above solution, the second adhesive layer 430 disposed in the first coating area 4221 can utilize the space between the connecting portion 310 and the first active material layer 120 in the thickness direction, ensuring the bonding strength between the first adhesive tape 400 and the first separator 200 without increasing the overall thickness of the cell 10 at the tab 300.

[0069] Based on the above scheme, in some embodiments, the second adhesive surface 422 further has a second coating area 4222; in the width direction of the battery cell 10, the second coating area 4222 is spaced from the tab 300, the first coating area 4221 and the second coating area 4222 are located on different sides of the tab 300, and the second coating area 4222 is provided with a second adhesive layer 430. The second adhesive layer 430 provided in the first coating area 4221 and the second coating area 4222 can further ensure the bonding strength between the first adhesive tape 400 and the first separator 200 without increasing the overall thickness of the battery cell 10 at the tab 300.

[0070] The arrangement of the first adhesive layer 410 connected to the electrode 100 has been described above. Without departing from the inventive concept of this utility model, those skilled in the art can adjust the specific position of the first adhesive layer 410 connected to the electrode 100. In some embodiments, please refer to... Figure 2 , Figure 3 , Figure 4 As shown, where Figure 4 It shows Figure 3 The connection relationship between the middle electrode 300 and the electrode 100 is as follows: the electrode 100 includes a current collector 110 and a first active material layer 120, and the first adhesive layer 410 is connected to the first active material layer 120.

[0071] Further, please refer to Figure 5As shown, in some embodiments, the electrode 100 includes a current collector 110, a tab 300 connected to the current collector 110, and a first adhesive layer 410 connected to the current collector 110. Through this design, the first adhesive tape 400 can be more securely connected to the electrode 100, further fixing it between the tab 300 and the electrode 100. The first adhesive tape 400 is less likely to slip relative to the tab 300 during long-term use, and the burrs on the tab 300 are less likely to penetrate the first separator 200, thus improving the overall safety of the battery cell 10.

[0072] Further, please refer to Figure 2 As shown, in some embodiments, the battery cell 10 further includes a second separator 600 and a second adhesive tape 700. The first separator 200, the electrode 100, and the second separator 600 are stacked sequentially and wound to form a wound structure. The second separator 600 stacked on the electrode 100 can also prevent the electrode 100 from directly contacting the adjacent electrode 100, thereby avoiding short circuits in the battery cell 10.

[0073] Based on the above solution, in some embodiments, the second adhesive tape 700 includes a third adhesive layer 710, a second substrate 720, and a fourth adhesive layer 730. The second substrate 720 is located between the second diaphragm 600 and the electrode 100, and is used to cover the side of the connection portion 310 near the tab 300. The third adhesive layer 710 is connected to the second substrate 720 and to the electrode 100, and the fourth adhesive layer 730 is connected to the second substrate 720 and to the second diaphragm 600. Through the above solution, since the second adhesive tape 700 is disposed between the second diaphragm 600 and the electrode 100, the second adhesive tape 700 can prevent burrs on the electrode 100 generated by connecting to the tab 300 from puncturing the second diaphragm 600, thereby improving the overall safety of the battery cell 10. Furthermore, since the second adhesive tape 700 is connected to the second diaphragm 600 and the electrode 100 through the third adhesive layer 710 and the fourth adhesive layer 730, the second adhesive tape 700 is less likely to slip relative to the tab 300 during long-term use, and the burrs on the tab 300 are less likely to penetrate the second diaphragm 600, which helps to improve the overall safety of the battery cell 10.

[0074] This utility model also proposes a battery, including a cell 10 as described in any of the above embodiments. Since the second adhesive layer 430, connected to the second adhesive surface 422, is connected to the first separator 200, the first adhesive tape 400 can be further fixed between the tab 300 and the electrode 100. During long-term use, it is less likely to slip relative to the tab 300, and burrs on the tab 300 are less likely to pierce the first separator 200, which helps improve the overall safety of the cell 10 and the overall safety of the battery.

[0075] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A battery cell, characterized in that, include: Electrode; A first diaphragm, the first diaphragm and the electrode are stacked and wound to form a wound structure; The tab includes a connecting portion and an extension portion connected together, the extension portion extending relative to the first diaphragm and relative to the electrode sheet along the axial direction of the winding structure; The connecting portion is located between the first diaphragm and the electrode, and is connected to one side of the electrode in the thickness direction; The first adhesive tape includes a first adhesive layer, a first substrate, and a second adhesive layer. The first substrate is located between the first diaphragm and the electrode tab and is used to cover the side of the connecting portion away from the electrode sheet. The first substrate has a first adhesive surface and a second adhesive surface, the first adhesive surface and the second adhesive surface are respectively located on different sides in the thickness direction of the first substrate, the first adhesive layer is connected to the first adhesive surface, connected to the electrode sheet, and / or connected to the electrode tab; The second adhesive layer is connected to the second adhesive surface and to the first diaphragm.

2. The battery cell according to claim 1, characterized in that, The battery cell has a set width and thickness, and the winding structure includes a straight area and a bent area arranged along the width direction of the battery cell; the electrode includes a plurality of straight portions located in the straight area, the plurality of straight portions are stacked along the thickness direction of the battery cell, and the thickness direction of the straight portions is parallel to the thickness direction of the battery cell; the tab is connected to one of the straight portions.

3. The battery cell according to claim 2, characterized in that, The electrode includes a current collector, a first active material layer, and a second active material layer. The connecting portion and the first active material layer are connected to the same side of the current collector, and the second active material layer is connected to the side of the current collector opposite to the connecting portion. Along the thickness direction of the battery cell, the size of the connecting portion is larger than the size of the first active material layer.

4. The battery cell according to claim 3, characterized in that, The second bonding surface has a first coating area; in the width direction of the battery cell, the first coating area is spaced from the tab, and the first coating area is provided with the second bonding layer.

5. The battery cell according to claim 4, characterized in that, The second adhesive surface also has a second coating area; in the width direction of the battery cell, the second coating area is spaced apart from the tab, the first coating area and the second coating area are located on different sides of the tab, and the second coating area is provided with the second adhesive layer.

6. The battery cell according to claim 3, characterized in that, Along the thickness direction of the battery cell, the size of the connecting portion is L1, and the size of the first active material is L2; ​​the thickness direction of the first adhesive paper is parallel to the thickness direction of the first substrate, and the thickness of the first adhesive paper is L. Where L≥0.1*L2, and / or L≤10*L2-L1.

7. The battery cell according to claim 2, characterized in that, The second bonding surface has a third coating area; in the width direction of the battery cell, the third coating area is located between the two sides of the tab, and the third coating area is provided with the second bonding layer.

8. The battery cell according to claim 1, characterized in that, The electrode includes a current collector, the tab is connected to the current collector, and the first adhesive layer is connected to the current collector.

9. The battery cell according to claim 1, characterized in that, It also includes a second diaphragm and a second adhesive paper, wherein the first diaphragm, the electrode sheet and the second diaphragm are stacked in sequence and wound to form the wound structure; The second adhesive tape includes a third adhesive layer, a second substrate, and a fourth adhesive layer. The second substrate is located between the second diaphragm and the electrode and is used to cover the side of the connection portion near the electrode. The third adhesive layer is connected to the second substrate and to the electrode, and the fourth adhesive layer is connected to the second substrate and to the second diaphragm.

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

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