Battery cell and battery
By using elastic protective components to cover the stacked and wound cells in the corner areas, the problem of lithium plating caused by the increased interlayer gaps during long-cycle operation is solved, thus improving the safety and lifespan of the cells.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG LIWINON ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-04-17
- Publication Date
- 2026-05-15
AI Technical Summary
During long-cycle operation of the battery cell, stress at the corners of the cell causes the gaps between layers to widen, increasing the lithium-ion transport path and making lithium plating more likely.
The corner areas of the battery cell are covered with a protective component that includes an elastic layer. The elastic layer is located in the innermost layer of the battery cell and provides elasticity to keep the layers tightly attached and avoid excessive gaps.
This effectively avoids the lithium plating problem in the battery cell, improves the safety of the battery cell, and reduces interlayer gaps and the risk of lithium plating.
Smart Images
Figure CN224248670U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a battery cell and a battery. Background Technology
[0002] In related technologies, after the positive and negative electrode sheets are stacked and wound to form a battery cell, during long-term battery cell cycling, stress at the corners of the cell can cause the gaps between the layers to increase. Furthermore, in the later stages of battery cell cycling, the increased gaps also increase the lithium-ion transport path, which can lead to lithium plating problems in the battery cell. 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 that can effectively avoid lithium plating.
[0004] This utility model also proposes a battery.
[0005] A battery cell according to a first aspect of the present invention includes: a positive electrode sheet, a negative electrode sheet, and a first protective member, wherein the battery cell is formed by stacking and winding the positive electrode sheet and the negative electrode sheet;
[0006] The negative electrode sheet includes a first segment, a second segment, and a third segment. The two ends of the second segment are connected to the first segment and the third segment, respectively. Neither side of the first segment has a negative electrode active material layer. One side of the second segment has a negative electrode active material layer. Both sides of the third segment have a negative electrode active material layer. The end of the first segment away from the second segment is the starting point of the winding of the negative electrode sheet. The end of the third segment away from the second segment is the ending point of the winding of the negative electrode sheet.
[0007] The first protective element is connected to the corner area of the second segment, and the first protective element covers the end of the first segment away from the second segment;
[0008] The first protective component includes an elastic layer, which is elastic.
[0009] The battery cell according to the embodiments of this utility model has at least the following beneficial effects: the battery cell is formed by stacking and winding positive and negative electrode sheets. After the first protective member connects to the corner area of the second segment, the first protective member can cover the end of the first segment away from the second segment; that is, the first protective member is disposed at the corner of the battery cell. The first protective member includes an elastic layer. In the prior art, the gap between layers in the battery cell becomes large during long-cycle operation. In this application, the first protective member is located in the innermost layer of the battery cell. The first protective member is elastic, and its elasticity allows the layers to adhere tightly to each other, effectively preventing excessive gaps between layers. This effectively avoids the problem of lithium plating in the battery cell. Specifically, the battery cell can effectively avoid lithium plating.
[0010] According to some embodiments of the present invention, the first protective component includes a base layer, a first adhesive layer, the elastic layer, and a second adhesive layer stacked together, wherein the second adhesive layer is connected to the side of the second segment opposite to the negative electrode active material layer.
[0011] According to some embodiments of the present invention, the elastic layer of the battery cell is made of polyurethane foam.
[0012] According to some embodiments of the present invention, the battery cell further includes a second protective member. The positive electrode includes a first end and a second end. The first end is the starting point of the winding of the positive electrode, and the second end is the ending point of the winding of the positive electrode. The second protective member is connected to the corner area of the second segment and covers the first end.
[0013] According to some embodiments of the present invention, the battery cell further includes a second protective component. The positive electrode includes a fourth segment, a fifth segment, and a sixth segment. The two ends of the fifth segment are respectively connected to the fourth segment and the sixth segment. The fourth segment does not have a positive active material layer on either side. The fifth segment has a positive active material layer on both sides. The sixth segment has a positive active material layer on the side closer to the negative electrode. The end of the fourth segment away from the fifth segment is the starting point of the winding of the positive electrode, and the end of the sixth segment away from the fifth segment is the ending point of the winding of the positive electrode. The second protective component is connected to the fourth segment and the fifth segment.
[0014] According to some embodiments of the present invention, the battery cell further includes a third protective component and a negative electrode tab. The negative electrode sheet is provided with a first electrode tab groove, the negative electrode tab is disposed in the first electrode tab groove, and the third protective component covers the first electrode tab groove.
[0015] According to some embodiments of the present invention, the battery cell further includes a first adhesive paper, which is connected to the positive electrode sheet on the side near the negative electrode tab. Along the thickness direction of the positive electrode sheet, the projection of the negative electrode tab falls on the projection of the first adhesive paper.
[0016] According to some embodiments of the present invention, the battery cell further includes a fourth protective element and a positive electrode tab. The positive electrode plate is provided with a second electrode tab groove, the positive electrode tab is disposed in the second electrode tab groove, and the fourth protective element covers the second electrode tab groove.
[0017] According to some embodiments of the present invention, the battery cell further includes a second adhesive paper, which is connected to the side of the negative electrode sheet near the positive electrode tab, and the projection of the positive electrode tab falls on the projection of the second adhesive paper along the thickness direction of the negative electrode sheet.
[0018] The battery according to the second aspect embodiment of the present invention includes the battery cell described in any one of the first aspect embodiments.
[0019] The battery according to the embodiments of this utility model has at least the following beneficial effects: the battery cell is formed by stacking and winding positive and negative electrode sheets. After the first protective member connects to the corner area of the second segment, the first protective member can cover the end of the first segment away from the second segment; that is, the first protective member is located at the corner of the battery cell. The first protective member includes an elastic layer. In the prior art, the gap between layers in the battery cell becomes large during long-cycle operation. In this application, the first protective member is located in the innermost layer of the battery cell. The first protective member is elastic, and its elasticity allows the layers to adhere tightly to each other, effectively preventing excessive gaps between layers. This effectively avoids the problem of lithium plating in the battery cell. Specifically, the battery cell can effectively avoid lithium plating. Furthermore, the battery with this cell has higher safety.
[0020] 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
[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:
[0022] Figure 1 This is a schematic diagram of the battery cell according to the first embodiment of the present invention;
[0023] Figure 2 This is a schematic diagram of the first protective component in the battery cell according to some embodiments of the present invention;
[0024] Figure 3This is a schematic diagram of the battery cell according to the second embodiment of the present invention;
[0025] Figure 4 for Figure 3 Enlarged view of point A in the middle;
[0026] Figure 5 for Figure 3 Enlarged view of point B in the middle;
[0027] Figure 6 This is a schematic diagram of the battery cell according to the third embodiment of the present invention;
[0028] Figure 7 This is a schematic diagram of the positive electrode plate and positive electrode tab in the battery cell of the first embodiment of this utility model;
[0029] Figure 8 This is a schematic diagram of the positive electrode plate and positive electrode tab in the battery cell of the second embodiment of this utility model.
[0030] Figure label:
[0031] Battery cell 10, negative electrode sheet 100, first section 110, second section 120, third section 130, negative electrode active material layer 140, first electrode tab groove 150, positive electrode sheet 200, first end 210, second end 220, fourth section 230, fifth section 240, sixth section 250, positive electrode active material layer 260, second electrode tab groove 270, first protective component 300, base layer 310, first adhesive layer 320, elastic layer 330, second adhesive layer 340, second protective component 400, third protective component 500, fourth protective component 600, first adhesive paper 700, second adhesive paper 800, negative electrode tab 900, positive electrode tab 1000. Detailed Implementation
[0032] 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.
[0033] 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.
[0034] 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.
[0035] 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.
[0036] 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.
[0037] In related technologies, after positive and negative electrode sheets are stacked and wound to form a battery cell, during long-term battery cell cycling, stress at the corners of the cell causes the gaps between the layers to increase. Furthermore, in the later stages of battery cell cycling, the increased gaps also enlarge the lithium-ion transport path, which can easily lead to lithium plating problems in the battery cell. Therefore, this application proposes a new battery cell.
[0038] Please refer to Figure 1 , Figure 2 and Figure 3In some embodiments, the battery cell 10 includes: a positive electrode 200, a negative electrode 100, a separator, and a first protective element 300. The battery cell 10 is formed by stacking and winding the positive electrode 200 and the negative electrode 100. The separator is located between the positive electrode 200 and the negative electrode 100; this part is prior art and will not be described further here. The negative electrode 100 includes a first segment 110, a second segment 120, and a third segment 130. The two ends of the second segment 120 are respectively connected to the first segment 110 and the third segment 130. That is, the second segment 120 is located between the first segment 110 and the third segment 130. The lengths of the first segment 110, the second segment 120, and the third segment 130 are not specifically limited. When the length of the first segment 110 is small, the first segment 110 has no curved portion and is straight. When the first segment 110 is relatively long, it has both straight and curved sections, with the curved sections forming corners in the cell 10. The second segment 120 and the third segment 130 are both longer than the first segment 110, and both have curved and straight sections. Furthermore, the first segment 110 does not have a negative electrode active material layer 140 on either side, while the second segment 120 has a negative electrode active material layer 140 on one side. Specifically, this means that the negative electrode active material layer 140 is located on the side of the second segment 120 closest to the positive electrode plate 200, or on the side of the second segment 120 away from the positive electrode plate 200. Negative electrode active material layers 140 are provided on both sides of the third segment 130. The end of the first segment 110 away from the second segment 120 is the starting point for winding the negative electrode sheet 100, and the end of the third segment 130 away from the second segment 120 is the ending point for winding the negative electrode sheet 100. The starting point for winding the negative electrode sheet 100 refers to starting winding from one end of the negative electrode sheet 100, which, together with the positive electrode sheet 200, can form a battery cell 10. The first protective member 300 is connected to the corner area of the second segment 120, and the first protective member 300 covers the end of the first segment 110 away from the second segment 120. The first protective member 300 includes an elastic layer 330, which is elastic.Specifically, the battery cell 10 is formed by stacking and winding positive electrode 200 and negative electrode 100. After the first protective member 300 connects to the corner area of the second segment 120, the first protective member 300 can cover the end of the first segment 110 away from the second segment 120. That is, the first protective member 300 is located at the corner of the battery cell 10. The first protective member 300 includes an elastic layer 330. In the prior art, the battery cell 10 can result in large gaps between layers during long-term cycling. In this application, the first protective member 300 is located at the innermost layer of the battery cell 10. The elasticity of the first protective member 300 allows the layers to adhere tightly to each other, effectively preventing excessive gaps between layers. This effectively avoids lithium plating in the battery cell 10. Specifically, the battery cell 10 can effectively prevent lithium plating.
[0039] Furthermore, the first protective element 300 not only effectively prevents lithium plating in the battery cell 10, but also, by covering the end of the first segment 110 furthest from the second segment 120, effectively avoids safety hazards caused by cutting burrs from the first segment 110. The gaps between layers mentioned above specifically refer to the gaps between adjacent positive and negative electrode sheets 200 and 100 at the corners after they are stacked and wound. With the first protective element 300 installed, its elasticity allows adjacent positive and negative electrode sheets 200 and 100 to adhere tightly at the corners, preventing excessive gaps between them.
[0040] Further, please refer to Figure 2 The specific structure of the first protective element 300 is described below. In some embodiments, the first protective element 300 includes a base layer 310, a first adhesive layer 320, an elastic layer 330, and a second adhesive layer 340 stacked together. The second adhesive layer 340 is connected to the side of the second segment 120 opposite to the negative electrode active material layer 140. Specifically, the first protective element 300 can be adhesive tape. The base layer 310 can be made of PI or PET, and the elastic layer 330 can be made of polyurethane (TPU) film, silicone film, natural rubber sheet, silicone gel, TPE (thermoplastic elastomer), or polyurethane foam. After the first protective element 300 includes the elastic layer 330, the elasticity of the first protective element 300 can make adjacent positive electrode plates 200 and negative electrode plates 100 stick together tightly. It should be noted that the first protective element 300 may also include multiple elastic layers 330, which are connected by adhesive bonding. Alternatively, the thickness of the elastic layer 330 is greater than the thickness of the base layer 310 and the first adhesive layer 320, thereby giving the first protective member 300 higher elasticity.
[0041] Furthermore, in some embodiments, the elastic layer 330 is made of polyurethane foam. Polyurethane foam is characterized by good elasticity and corrosion resistance. Specifically, the polyurethane foam can be PORON foam, PU foam, Korel foam, CR foam, or EVA foam.
[0042] Further, please refer to Figure 1 In some embodiments, the battery cell 10 further includes a second protective member 400. The positive electrode 200 includes a first end 210 and a second end 220. The first end 210 is the starting point for winding the positive electrode 200, and the second end 220 is the ending point for winding the positive electrode 200. The second protective member 400 is connected to the corner area of the second segment 120 and covers the first end 210. Specifically, the positive electrode 200 is wound with the first end 210 as the starting point. The second protective member 400 is connected to the second segment 120; specifically, the second protective member 400 can be adhered to the bend of the second segment 120, and the second protective member 400 can cover the first end 210. The first protective element 300 and the second protective element 400 are located on opposite sides of the width direction of the battery cell 10. The second protective element 400 serves two purposes: firstly, it ensures that adjacent positive electrode plates 200 and negative electrode plates 100 are tightly attached; secondly, after covering the first end 210, the second protective element 400 conceals any cutting burrs on the first end 210, effectively improving the safety of the battery cell 10. Furthermore, the structure of the second protective element 400 can be identical to that of the first protective element 300. In this embodiment, the starting points of the winding of the positive electrode plate 200 and the negative electrode plate 100 have different orientations in the width direction of the battery cell 10. For example, the starting point of the winding of the positive electrode plate 200 faces the left side of the width direction of the battery cell 10, and the starting point of the winding of the negative electrode plate 100 faces the right side of the width direction of the battery cell 10. Additionally, in this embodiment, the positive electrode tab 1000 can be connected to the middle position of the positive electrode plate 200, and the negative electrode plate 100 can be connected to the middle position of the negative electrode plate 100. Alternatively, multiple positive tabs 1000 may be provided, each connected to the positive electrode plate 200 and spaced apart along the length of the positive electrode plate 200. See [reference needed] for details. Figure 7 Multiple negative electrode tabs 900 are provided, each connected to the negative electrode plate 100 and spaced apart along the length of the negative electrode plate 100. Alternatively, a positive electrode tab 1000 is connected to one side of the positive electrode plate 200, and the length of the positive electrode tab 1000 is the same as the length of the positive electrode plate 200. See [reference needed] for details. Figure 8 The negative electrode tab 900 is connected to one side of the negative electrode plate 100. The length of the negative electrode tab 900 is the same as the length of the negative electrode plate 100, forming a full electrode tab structure.
[0043] Further, please refer to Figure 3 and Figure 6In some embodiments, the battery cell 10 further includes a second protective element 400. The positive electrode 200 includes a fourth segment 230, a fifth segment 240, and a sixth segment 250. The two ends of the fifth segment 240 are connected to the fourth segment 230 and the sixth segment 250, respectively. The fourth segment 230 does not have a positive active material layer 260 on either side, the fifth segment 240 has a positive active material layer 260 on both sides, and the sixth segment 250 has a positive active material layer 260 on the side closer to the negative electrode 100. The end of the fourth segment 230 away from the fifth segment 240 is the starting point of the winding of the positive electrode 200, and the end of the sixth segment 250 away from the fifth segment 240 is the ending point of the winding of the positive electrode 200. The second protective element 400 is connected to the fourth segment 230 and the fifth segment 240. Specifically, the second protective element 400 can be connected to the curved and straight portions of the fourth segment 230 and the straight portion of the fifth segment 240. The provision of the second protective element 400 can effectively prevent lithium plating from occurring in the cell 10. In addition, in this embodiment, the first protective element 300 can also cover the end of the fourth segment 230 away from the fifth segment 240. That is, the first protective element 300 can cover the winding start ends of the positive electrode 200 and the negative electrode 100, thereby effectively preventing the cutting burrs at the winding start ends of the positive electrode 200 and the negative electrode 100 from reducing the safety of the cell 10.
[0044] Further, please refer to Figure 4 In some embodiments, the battery cell 10 further includes a third protective element 500 and a negative electrode tab 900. The negative electrode sheet 100 has a first electrode tab groove 150, the negative electrode tab 900 is disposed in the first electrode tab groove 150, and the third protective element 500 covers the first electrode tab groove 150. Specifically, the first electrode tab groove 150 is formed by removing the negative electrode active material layer 140 from the negative electrode sheet 100. The negative electrode tab 900 is welded to the groove wall (negative electrode current collector) of the first electrode tab groove 150. Specifically, the third protective element 500 can cover the first electrode tab groove 150, with both ends of the third protective element 500 bonded to the edges of the first electrode tab groove 150. The third protective component 500 has the same structure as the first protective component 300. After the third protective component 500 covers the first electrode tab groove 150, it can, on the one hand, cover the welding burrs of the negative electrode tab 900 and the negative electrode sheet 100; on the other hand, because the third protective component 500 is elastic, it can fill the gap in the first electrode tab groove 150, providing certain support during the formation of the cell 10 and reducing the formation pressure on the edge of the first electrode tab groove 150 and the material area near the edge. Specifically, the third protective component 500 can reduce the risk of lithium plating on the negative electrode sheet 100 and improve the cycle life of the cell 10.
[0045] Further, please refer to Figure 4 In some embodiments, the battery cell 10 further includes a first adhesive tape 700. The first adhesive tape 700 is attached to the side of the positive electrode 200 near the negative electrode tab 900, and the projection of the negative electrode tab 900 falls on the projection of the first adhesive tape 700 along the thickness direction of the positive electrode 200. The first adhesive tape 700 further ensures that welding burrs from the negative electrode tab 900 and the negative electrode 100 do not pierce the positive electrode 200, thereby effectively preventing short circuits in the battery cell 10.
[0046] Further, please refer to Figure 5 In some embodiments, the battery cell 10 further includes a fourth protective element 600 and a positive electrode tab 1000. The positive electrode plate 200 is provided with a second electrode tab groove 270, the positive electrode tab 1000 is disposed in the second electrode tab groove 270, and the fourth protective element 600 covers the second electrode tab groove 270. Specifically, the second electrode tab groove 270 is formed by removing the positive electrode active material layer 260 from the positive electrode plate 200. The positive electrode tab 1000 is welded to the groove wall (positive electrode current collector) of the second electrode tab groove 270. Specifically, the fourth protective element 600 can cover the second electrode tab groove 270, with both ends of the fourth protective element 600 bonded to the edges of the second electrode tab groove 270. The fourth protective component 600 has the same structure as the first protective component 300. After covering the second tab groove 270, the fourth protective component 600 can, on the one hand, cover the welding burrs of the positive tab 1000 and the positive electrode plate 200; on the other hand, because the fourth protective component 600 is elastic, it can fill the gap in the second tab groove 270, providing certain support during the formation of the cell 10 and reducing the formation pressure on the edge of the second tab groove 270 and the material area near the edge. Specifically, the fourth protective component 600 can reduce the risk of lithium plating in the cell 10 and improve the cycle life of the cell 10.
[0047] Further, please refer to Figure 5 In some embodiments, the battery cell 10 further includes a second adhesive tape 800, which is connected to the side of the negative electrode 100 near the positive electrode tab 1000. Along the thickness direction of the negative electrode 100, the projection of the positive electrode tab 1000 falls on the projection of the second adhesive tape 800. The second adhesive tape 800 further ensures that welding burrs between the positive electrode tab 1000 and the positive electrode 200 do not pierce the negative electrode 100, thereby effectively preventing short circuits in the battery cell 10.
[0048] In some embodiments, the battery includes a cell 10 as described in any of the above embodiments. Specifically, the cell 10 is formed by stacking and winding a positive electrode 200 and a negative electrode 100. After the first protective member 300 is connected to the corner area of the second segment 120, the first protective member 300 can cover the end of the first segment 110 away from the second segment 120. That is, the first protective member 300 is disposed at the corner of the cell 10. The first protective member 300 includes an elastic layer 330. In the prior art, the cell 10 may have large gaps between layers during long-term cycling. In this application, the first protective member 300 is located in the innermost layer of the cell 10. The first protective member 300 is elastic, and the elasticity of the first protective member 300 can make the layers adhere tightly to each other, thereby effectively avoiding excessive gaps between layers. This can effectively prevent lithium plating in the cell 10. Specifically, the cell 10 can effectively prevent lithium plating. Furthermore, the battery with this cell 10 has higher safety.
[0049] 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: The battery cell comprises a positive electrode, a negative electrode, and a first protective component, wherein the battery cell is formed by winding the positive and negative electrode layers together. The negative electrode sheet includes a first segment, a second segment, and a third segment. The two ends of the second segment are connected to the first segment and the third segment, respectively. Neither side of the first segment has a negative electrode active material layer. One side of the second segment has a negative electrode active material layer. Both sides of the third segment have a negative electrode active material layer. The end of the first segment away from the second segment is the starting point of the winding of the negative electrode sheet. The end of the third segment away from the second segment is the ending point of the winding of the negative electrode sheet. The first protective element is connected to the corner area of the second segment, and the first protective element covers the end of the first segment away from the second segment; The first protective component includes an elastic layer, which is elastic.
2. The battery cell according to claim 1, characterized in that, The first protective component includes a base layer, a first adhesive layer, the elastic layer, and a second adhesive layer stacked together, wherein the second adhesive layer is connected to the side of the second segment opposite to the negative electrode active material layer.
3. The battery cell according to claim 1, characterized in that, The elastic layer is made of polyurethane foam.
4. The battery cell according to claim 1, characterized in that, The battery cell also includes a second protective component. The positive electrode includes a first end and a second end. The first end is the starting point of the winding of the positive electrode, and the second end is the ending point of the winding of the positive electrode. The second protective component is connected to the corner area of the second segment and covers the first end.
5. The battery cell according to claim 1, characterized in that, The battery cell also includes a second protective component. The positive electrode includes a fourth segment, a fifth segment, and a sixth segment. The two ends of the fifth segment are connected to the fourth segment and the sixth segment, respectively. The fourth segment does not have a positive active material layer on either side. The fifth segment has a positive active material layer on both sides. The sixth segment has a positive active material layer on the side closer to the negative electrode. The end of the fourth segment away from the fifth segment is the starting point of the winding of the positive electrode. The end of the sixth segment away from the fifth segment is the ending point of the winding of the positive electrode. The second protective component is connected to the fourth segment and the fifth segment.
6. The battery cell according to claim 1, characterized in that, The battery cell also includes a third protective component and a negative electrode tab. The negative electrode sheet is provided with a first electrode tab groove, the negative electrode tab is disposed in the first electrode tab groove, and the third protective component covers the first electrode tab groove.
7. The battery cell according to claim 6, characterized in that, The battery cell also includes a first adhesive tape, which is attached to the side of the positive electrode sheet near the negative electrode tab. Along the thickness direction of the positive electrode sheet, the projection of the negative electrode tab falls on the projection of the first adhesive tape.
8. The battery cell according to claim 1, characterized in that, The battery cell also includes a fourth protective component and a positive electrode tab. The positive electrode plate is provided with a second electrode tab groove, the positive electrode tab is disposed in the second electrode tab groove, and the fourth protective component covers the second electrode tab groove.
9. The battery cell according to claim 8, characterized in that, The battery cell also includes a second adhesive tape, which is connected to the side of the negative electrode sheet near the positive electrode tab. Along the thickness direction of the negative electrode sheet, the projection of the positive electrode tab falls on the projection of the second adhesive tape.
10. A battery, characterized in that, Includes the battery cell as described in any one of claims 1 to 9.