Battery cell and battery

Abstract

The utility model provides a kind of electric core and battery, comprising: anode sheet, diaphragm and cathode sheet, the diaphragm separates the anode sheet with the cathode sheet, the anode sheet and the cathode sheet are alternately laminated;Anode lug, the anode lug is set on the anode sheet;First adhesive paper, the first adhesive paper is set on the cathode sheet adjacent to the anode lug, the first adhesive paper is set on the cathode sheet opposite the anode lug side, the projection of the anode lug in first direction is in the projection of the first adhesive paper in first direction, the first direction is the laminating direction of the anode sheet and the cathode sheet, and the first adhesive paper is insulating material.For the electric core of the utility model, lithium precipitation phenomenon can be effectively prevented in the process of long cycle of electric core.

Description

Technical Field

[0001] This utility model relates to the field of new energy technology, and in particular to a battery cell and battery. Background Technology

[0002] Currently, battery products are all developing towards higher energy density, using higher coating weight and compaction density. However, as the charging time of battery cells becomes shorter and the charging rate becomes higher, the temperature rise of battery cells during charging also increases. This makes it easy for black spots and lithium plating to appear in some areas of the tab alignment region of the negative electrode during long-term cycling, which can even lead to the failure of the entire battery cell during cycling. Therefore, a battery cell is needed to effectively prevent lithium plating from occurring during long-term cycling. 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 prevent lithium plating during long-term cycling.

[0004] This utility model also proposes a battery.

[0005] A battery cell according to a first aspect of the present invention includes: an anode plate, a separator, and a cathode plate, wherein the separator separates the anode plate and the cathode plate, and the anode plate and the cathode plate are alternately stacked; an anode tab disposed on the anode plate; and a first adhesive tape disposed on the cathode plate adjacent to the anode tab, the first adhesive tape being disposed on the side of the cathode plate opposite to the anode tab, the projection of the first adhesive tape in a first direction corresponding to the projection of the anode tab in a first direction, the first direction being the stacking direction of the anode plate and the cathode plate, and the first adhesive tape being an insulating material.

[0006] The battery cell according to the first aspect of the present invention has at least the following beneficial effects: During the cyclic charging and discharging process of the battery cell, due to temperature changes, especially at the position of the anode tab, the temperature changes are more drastic. This makes lithium plating very likely to occur at the position of the cathode plate corresponding to the anode tab, especially on the side of the cathode plate opposite to the anode tab. Therefore, by setting an insulating first adhesive paper at this position, lithium ions in the cathode active material at this position are isolated, preventing the lithium ions at this position from detaching or migrating to other positions with smaller temperature changes to react, thereby effectively avoiding the occurrence of lithium plating at this position.

[0007] According to some embodiments of the present invention, a first groove is provided on the cathode sheet, and the first groove is used to accommodate the first adhesive paper.

[0008] According to some embodiments of the present invention, the portion of the projection of the anode tab along the first direction onto the anode sheet is an overlapping area, the overlapping area is located within the projection of the first adhesive paper along the first direction, the portion of the edge of the projection of the anode tab along the first direction onto the anode sheet is an overlapping edge, and the interval between the edge of the projection of the first adhesive paper onto the anode sheet along the first direction and the overlapping edge is not less than 1 mm.

[0009] According to some embodiments of the present invention, the battery cell further includes a second groove and a second adhesive paper. The second groove is formed on the anode sheet and is used to accommodate the anode tab. The second adhesive paper is disposed on both sides of the anode sheet and covers the surface of the second groove along the first direction.

[0010] According to some embodiments of the present invention, a third groove is provided on the side of the cathode plate adjacent to the anode tab facing the anode tab, the third groove facing the anode tab, and along the first direction, the third groove is used to accommodate the portion of the anode tab protruding from the second groove.

[0011] According to some embodiments of the present invention, the battery cell further includes a third adhesive paper covering the third groove, wherein the projection of the second groove in the first direction is located within the projection of the third adhesive paper in the first direction.

[0012] According to some embodiments of the present invention, the cathode plates adjacent to the anode tab are respectively a first cathode plate and a second cathode plate, and the third groove on the first cathode plate and the third groove on the second cathode plate are symmetrically arranged on both sides of the anode tab.

[0013] According to some embodiments of the present invention, the anode sheet is provided with a plurality of anode tabs, the plurality of anode tabs are spaced apart in a second direction, the second direction being the extension direction of the anode sheet, and the projections of the plurality of anode tabs in the first direction are spaced apart from each other.

[0014] According to some embodiments of the present invention, the interval between the projections of the plurality of anode tabs in the first direction is not less than 5 mm.

[0015] According to some embodiments of the present invention, the width of the first adhesive tape in the second direction is A, the size of the anode tab in the second direction is B, the second direction is the extension direction of the anode sheet, the size of the second groove in the second direction is C, C>B, and 1.5C≥A≥0.5B.

[0016] According to some embodiments of this utility model, the first adhesive tape has a dimension D in a third direction, the anode tab has a welding portion, the welding portion overlaps with the second groove in the first direction, the welding portion has a dimension E in a third direction, the third direction is the width direction of the anode sheet, the second groove has a dimension F in a third direction, F > E, and 1.5F ≥ D ≥ 0.5E The battery according to a second aspect of the present invention includes the battery cell described in any one of the above embodiments.

[0017] 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

[0018] Figure 1 This is a schematic diagram of the structure of the battery cell of this utility model, which has a first adhesive paper. Figure 2 This is a schematic diagram of the structure of the battery cell of this utility model, which has a first groove. Figure 3 This is a schematic diagram of the battery cell of this utility model with a third groove.

[0019] Icon labels: 1. Anode plate; 11. Anode tab; 2. Cathode plate; 3. Diaphragm; 41. First adhesive tape; 42. Second adhesive tape; 43. Third adhesive tape; 51. First groove; 52. Second groove; 53. Third groove. Detailed Implementation

[0020] 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.

[0021] In the description of this utility model, it should be understood that the orientation descriptions, such as up and down, are based on the orientation 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.

[0022] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0023] 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.

[0024] The manufacturing process of a battery cell mainly includes the following steps: First, prepare all raw materials such as positive electrode material, negative electrode material, electrolyte, and separator. The positive electrode material is usually composed of lithium metal oxide, while the negative electrode material is mostly graphite or silicon-based. The electrolyte is generally made by dissolving lithium salt in an organic solvent. Next, mix the positive electrode material with a conductive agent and binder, and coat it onto aluminum foil to form a positive electrode sheet. Similarly, mix the negative electrode material with a conductive agent and binder, and coat it onto copper foil to form a negative electrode sheet. Then, stack the coated positive and negative electrode sheets and the separator in a specific order, winding or laminating them into the initial shape of the battery cell. Afterward, place the wound or laminated battery cell into a casing, inject electrolyte, and then seal it. After sealing, the battery cell needs to undergo a formation process, i.e., charging and discharging under specific conditions to form a stable SEI film (solid electrolyte interface film). Finally, a series of tests are conducted on the battery cells, including capacity testing, internal resistance testing, and cycle life testing, to ensure that the performance of the battery cells meets the standards. Only then is the battery cell manufacturing process considered complete.

[0025] The energy density of a battery cell refers to the energy that can be stored per unit volume or unit mass of the cell. It is usually expressed in watt-hours per liter (Wh / L) for volumetric energy density and in watt-hours per kilogram (Wh / kg) for gravimetric energy density. Higher energy density means the cell can store more electrical energy per unit volume or mass, which is crucial for applications such as portable electronic devices and electric vehicles. How is the energy density of a battery cell calculated? The energy density of a battery cell, i.e., the energy stored per unit volume or unit mass of the battery, is one of the key indicators for measuring battery performance. It is influenced by a variety of complex factors, spanning a wide range of fields from materials science to engineering design. First, the chemical composition of the cell is the core factor affecting energy density. Different cathode materials, such as lithium cobalt oxide (LiCoO2), lithium nickel cobalt manganese oxide (NCM), or lithium iron phosphate (LFP), have different energy storage capacities. Anode materials, such as graphite or silicon-based materials, also affect the overall energy density due to their different electrochemical properties. The choice of electrolyte and the material of the separator are equally important, as they determine the efficiency and safety of ion transport within the battery. Design and manufacturing processes are also crucial factors affecting energy density. The battery's structural design, including electrode thickness, active material loading, and packaging method, significantly impacts energy density. For example, thinner electrodes reduce the use of inactive materials, thus increasing energy density per unit volume. The precision of the manufacturing process, such as coating uniformity, compaction density, and assembly accuracy, all affect battery performance. Furthermore, material quality and purity also have a significant impact on energy density. High-purity materials reduce internal side reactions and improve energy utilization. The microstructure of materials, such as particle size and distribution, also affects the surface area of ​​electrode materials and ion diffusion paths, thereby influencing the battery's charge and discharge performance.

[0026] To increase the energy density of the battery cell, the active material is pressed more tightly, and the electrodes are also pressed more tightly together. This results in an extremely high density of lithium ions. When lithium ions are affected by the environment and cannot be embedded on the anode plate in time, lithium plating occurs.

[0027] Electrolytes play a crucial role in batteries, serving not only as a medium for charge transfer but also as a key to the smooth operation of internal chemical reactions. Electrolytes are typically composed of a specific solvent and dissolved electrolyte salts, and the choice of materials directly impacts battery performance. In rechargeable batteries, the role of the electrolyte is particularly significant. It participates in the electrochemical reactions during charging and discharging and is responsible for efficiently transporting ions between the positive and negative electrodes, ensuring a smooth conversion between electrical and chemical energy. Taking lithium-ion batteries as an example, the electrolyte is usually composed of a series of carbonate solvents and lithium salts. These carbonate solvents, such as ethylene carbonate (EC), diethyl carbonate (DEC), and dimethyl carbonate (DMC), have good chemical stability and can withstand the high-temperature environment generated during charging and discharging. Lithium salts, such as lithium hexafluorophosphate (LiPF6), provide the necessary lithium ions, which shuttle between the positive and negative electrodes inside the battery, enabling the battery to store and release energy. The importance of electrolytes lies not only in their ability to ensure the smooth movement of ions during charging and discharging, but also in their contribution to the overall stability and safety of the battery. A well-designed electrolyte can reduce side reactions, extend battery life, and provide necessary protection under extreme conditions, preventing overheating or dangerous chemical reactions. Therefore, meticulous selection and optimization of electrolyte materials and properties during battery design and manufacturing are crucial steps in ensuring efficient, safe, and long-term stable battery operation. Consequently, during battery operation, it is essential to ensure that the electrodes are fully wetted by the electrolyte.

[0028] Reference Figure 1 and Figure 2The battery cell in the first embodiment of this utility model includes: an anode tab 11, a first adhesive tape 41, an anode sheet 1, a separator 3, and a cathode sheet 2. The separator 3 separates the anode sheet 1 and the cathode sheet 2, which are alternately stacked. The anode tab 11 is disposed on the anode sheet 1. During the cyclic charging and discharging process of the battery cell, the current is more concentrated at the anode tab 11, thus generating more heat. This results in a larger temperature change near the anode tab 11, making lithium plating more likely to occur in areas with large temperature variations. The first adhesive tape 41 is disposed on the cathode sheet 2 adjacent to the anode tab 11. The closer the location is to the anode tab 11, the greater the temperature change, making lithium plating more likely to occur. Therefore, the first groove 51 is formed on the cathode sheet 2 adjacent to the anode tab 11. This location is closer to the anode tab 11, resulting in greater temperature changes and making lithium plating more likely to occur. The first adhesive tape 41 is disposed on the side of the cathode plate 2 facing away from the anode tab 11. The projection of the first adhesive tape 41 in a first direction corresponds to the projection of the anode tab 11 in the same first direction, which is the stacking direction of the anode plate 1 and the cathode plate 2. The first adhesive tape 41 is an insulating material. When setting the anode tab 11, a groove is made on the side of the cathode plate 2 facing the anode tab 11 to accommodate it. Therefore, lithium plating does not occur on the side of the cathode plate 2 facing the anode tab 11 due to the smaller amount of cathode active material. However, lithium plating is more likely to occur on the side of the cathode plate 2 facing away from the anode tab 11 under the influence of ambient temperature. Therefore, by disposing of the first adhesive tape 41, the position corresponding to the anode tab 11 on the side of the cathode plate 2 facing away from the anode tab 11 is covered, thereby isolating the cathode active material at that position. This prevents lithium ions from escaping from that position, or forces them to migrate to other positions to escape, thus avoiding lithium plating at that position. In the cathode active material, the rate of lithium ion extraction increases with rising ambient temperature. Since a significant amount of heat is released at the anode tab 11, the surrounding environment temperature is higher, leading to faster lithium ion extraction at that location on the cathode plate 2 and resulting in lithium plating. However, with the first adhesive tape 41 installed, lithium ions in the covered area must travel a longer distance to escape, increasing resistance to extraction. This significantly reduces the extraction rate of lithium ions under the first adhesive tape 41, thus preventing lithium plating at that location.

[0029] According to some embodiments of this utility model, a first groove 51 is provided on the cathode plate 2, which is used to accommodate the first adhesive tape 41. In order to make the side of the cathode plate 2 adjacent to the anode tab 11 that is not facing the anode tab 11 flatter, the first groove 51 is provided to accommodate the first adhesive tape 41, thereby avoiding gaps at the first adhesive tape 41 and thus better preventing lithium plating at this position.

[0030] According to some embodiments of this utility model, the portion of the projection of the anode tab 11 along the first direction onto the anode plate 1 is an overlapping area, which is located within the projection of the first adhesive tape 41 along the first direction. This better avoids lithium plating. Specifically, the projection of the anode tab 11 along the first direction will have a portion on the anode plate 1 and another portion outside the anode plate 1, with the projection area on the anode plate 1 being the overlapping area. The edge of the projection of the anode tab 11 along the first direction onto the anode plate 1 is the overlapping edge. The distance between the edge of the projection of the anode tab 11 along the first direction onto the anode plate 1 and the overlapping edge is not less than 1 mm. The heat generated by the anode tab 11 will dissipate to the surrounding area, which will easily lead to lithium plating around the anode tab 11. Therefore, the first adhesive tape 41 is extended outward so that the gap between the edge of the first adhesive tape 41 and the edge of the anode tab 11 is not less than 1 mm, thereby expanding the coverage of the first adhesive tape 41 to further avoid the occurrence of lithium plating.

[0031] According to some embodiments of this utility model, the battery cell further includes a second groove 52 and a second adhesive tape 42. The second groove 52 is formed on the anode plate 1 and is used to accommodate the anode tab 11. The second adhesive tape 42 is disposed on both sides of the anode plate 1 and covers both ends of the second groove 52 along the first direction. The second groove 52 is provided to accommodate the anode tab 11 and to protect the anode tab 11 from solder marks on the anode tab 11 piercing the separator 3. Specifically, the anode active material on one or both sides of the anode current collector on the anode plate 1 at the location where the anode tab 11 needs to be disposed is removed, thereby forming the second groove 52. To provide more space to accommodate the thicker anode tab 11, the anode active material on both sides of the anode current collector is removed during the formation of the second groove 52 to create a larger accommodating space. After the second groove 52 is formed, to prevent solder burrs from penetrating the second groove 52 and piercing the separator 3, the second adhesive tape 42 is covered at both ends of the second groove 52 to isolate it.

[0032] Furthermore, the width of the first adhesive tape 41 in the second direction is A, the width of the anode tab 11 in the second direction is B, the second direction is the extension direction of the anode plate, and the width of the second groove 52 in the second direction is C, where 1.5C ≥ A ≥ 0.5B. This can better avoid the occurrence of lithium plating and also prevent the first adhesive tape 41 from being too large, which would cause a decrease in energy density.

[0033] Furthermore, the width of the first adhesive tape in the third direction is D. The anode tab has a welding portion that overlaps with the second groove in the first direction. The width of the welding portion in the third direction is E, where the third direction is the width direction of the anode sheet. The width of the second groove in the third direction is F, where F > E, and 1.5F ≥ D ≥ 0.5E. This further prevents lithium plating at this location and also further prevents the first adhesive tape 4 from being too large, which would cause a decrease in energy density.

[0034] According to some embodiments of this utility model, a third groove 53 is formed on the side of the cathode plate 2 adjacent to the anode tab 11 facing the anode tab 11. The third groove 53 is used to accommodate the portion of the anode tab 11 protruding from the second groove 52. By providing the second groove 52, the anode tab 11 can be made thicker, which not only reduces the heat release at the anode tab 11 position, thereby further avoiding the occurrence of lithium plating, but also makes the stacking at the anode tab 11 position more flat.

[0035] According to some embodiments of this utility model, a third adhesive tape 43 is also included, which covers the third groove 53, and the projection of the second groove 52 in the first direction is located within the projection of the third adhesive tape 43 in the first direction. The third adhesive tape 43 is provided to further prevent burrs on the tabs from piercing the diaphragm 3 and directly contacting the cathode plate 2, thus preventing short circuits in the battery cell.

[0036] According to some embodiments of this utility model, the cathode plates 2 adjacent to the anode tab 11 are a first cathode plate 2 and a second cathode plate 2, respectively. The third groove 53 on the first cathode plate 2 and the third groove 53 on the second cathode plate 2 are symmetrically arranged on both sides of the anode tab 11. The first cathode plate 2 and the second cathode plate 2 are symmetrically arranged, and the openings of the third groove 53 on the first cathode plate 2 and the third groove 53 on the second cathode plate 2 both face the anode tab 11. At the same time, they can also form a larger receiving space together with the second groove 52, thereby better accommodating the anode tab 11.

[0037] According to some embodiments of this utility model, a plurality of anode tabs 11 are provided on the anode sheet 1. The plurality of anode tabs 11 are spaced apart in a second direction, which is the extension direction of the anode sheet 1. The projections of the plurality of anode tabs 11 in the first direction are spaced apart from each other, and the interval between the projections of the plurality of anode tabs 11 in the first direction is not less than 5 mm. Staggering the anode tabs 11 can avoid interference between the anode tabs 11 and also avoid the thickness accumulation in the overlapping areas of the anode tabs 11, thus preventing the local thickness of the battery cell from being too large. Furthermore, the temperature change is greater in the overlapping areas of the anode tabs 11, that is, if the anode tabs 11 are too concentrated, the temperature is more likely to rise, thus increasing the likelihood of lithium plating. Therefore, the anode tabs 11 are arranged in an alternating manner.

[0038] The battery according to the second aspect of the present invention includes the battery cell of any of the above embodiments.

[0039] Experimental tests were conducted using a wound-type soft-pack lithium-ion battery. The experiment involved 1000 charge-discharge cycles. The dimensions (B) of the anode tab in the second direction were all 6 mm, the dimension (C) of the second groove in the second direction were all 11 mm, the dimension (E) of the welded part in the third direction was 14 mm, and the dimension (F) of the second groove in the third direction was 17 mm. The charge-discharge voltage was 3.93 V, and the cathode area was 189494.9 mm². 2 The thickness of the first adhesive tape in the first direction is 0.012 mm. Different changes are made to the dimensions of the first adhesive tape in the second direction and the third direction to conduct experimental tests. The third direction is the width direction of the cathode sheet, and the dimension of the first adhesive tape in the third direction is D.

[0040] Control Group 1: In this control group, the first adhesive tape is not used. At this point, both A and D are 0, and the energy loss is 0. Using this as the energy baseline, the lithium plating area reaches 374 mm² after the experiment. 2 This indicates a relatively severe lithium plating phenomenon. (When the lithium plating area is between 0-100 mm²) 2 Slight lithium plating occurs between these two periods, with the plating area being 100-200 mm². 2 The condition is moderate lithium plating, with a lithium plating area of ​​200 mm². 2 The above refers to the severity of lithium plating.

[0041] In control group 2, the dimension A of the first adhesive tape in the second direction was 18 mm, and the dimension D of the first adhesive tape in the third direction was 27 mm. At this time, the energy loss reached 0.50%, and no lithium plating phenomenon occurred.

[0042] In control group 3, the dimension A of the first adhesive tape in the second direction is 2 mm, and the dimension D of the first adhesive tape in the third direction is 6 mm. In this case, the energy loss reaches 0.25%, and the lithium plating area reaches 300 mm². 2 .

[0043] The only difference between experimental groups 1-4 was the adjustment of the dimension A of the first adhesive strip in the second direction, while the dimension D of the first adhesive strip in the third direction was always set to 14 mm. In experimental group 1, the dimension A of the first adhesive strip in the second direction was 3 mm, at which point the energy loss reached 0.26% and the lithium plating area reached 60 mm². 2 The result was slight lithium plating. In experimental group 2, the dimension A of the first adhesive paper in the second direction was 6 mm, at which point the energy loss reached 0.28%, and the lithium plating area reached 15 mm². 2 The result was slight lithium plating. In experimental group 3, the dimension A of the first adhesive paper in the second direction was 11 mm, at which point the energy loss reached 0.32%, and the lithium plating area was 0 mm². 2 No lithium plating occurs; in experimental group 4, the dimension A of the first adhesive paper in the second direction is 16.5 mm, at which point the energy loss reaches 0.36%, and the lithium plating area is 0 mm². 2 Lithium plating does not occur.

[0044] The only difference between experimental groups 5-7 was the adjustment of the dimension D of the first adhesive strip in the third direction, while the dimension A of the first adhesive strip in the second direction was always set to 6 mm. In experimental group 5, the dimension D of the first adhesive strip in the third direction was 7 mm, at which point the energy loss reached 0.26% and the lithium plating area was 55 mm². 2 The result was slight lithium plating; in experimental group 6, the dimension D of the first adhesive tape in the third direction was 17 mm, at which point the energy loss reached 0.29%, and the lithium plating area was 0 mm². 2 No lithium plating occurred; in experimental group 7, the dimension D of the first adhesive paper in the third direction was 25.5 mm, at which point the energy loss reached 0.32%, and the lithium plating area was 0 mm². 2 No lithium plating occurs. The only difference between experimental groups 8 and 9 was the adjustment of the dimension D of the first adhesive strip in the third direction, while the dimension A of the first adhesive strip in the second direction was always set to 3 mm. In experimental group 8, the dimension D of the first adhesive strip in the third direction was 7 mm, at which point the energy loss reached 0.25% and the lithium plating area was 95 mm². 2 The result was slight lithium plating. In experimental group 9, the dimension D of the first adhesive tape in the third direction was 25.5 mm, at which point the energy loss reached 0.28%, and the lithium plating area was 25 mm². 2 Slight lithium plating; The only difference between experimental groups 10 and 11 was the adjustment of the dimension D of the first adhesive strip in the third direction, while the dimension A of the first adhesive strip in the second direction was always set to 16.5 mm. In experimental group 10, the dimension D of the first adhesive strip in the third direction was 7 mm, at which point the energy loss reached 0.30% and the lithium plating area was 0 mm². 2 No lithium plating occurs; in experimental group 11, the dimension D of the first adhesive paper in the third direction is 25.5 mm, at which point the energy loss will reach 0.46%, and the lithium plating area will reach 0 mm². 2 Lithium plating does not occur.

[0045] The comparison of the above experiments shows that limiting the length and width of the first adhesive tape within a certain range can better prevent lithium plating and reduce the impact on energy density. Specifically, better results can be achieved when the dimension A of the first adhesive tape in the second direction satisfies 1.5C≥A≥0.5B, and when the dimension D of the first adhesive tape in the third direction satisfies 1.5F≥D≥0.5E.

[0046] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model 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 utility model.

Claims

1. A battery cell, characterized in that, include: An anode plate, a diaphragm, and a cathode plate, wherein the diaphragm separates the anode plate and the cathode plate, and the anode plate and the cathode plate are stacked alternately; Anode tab, wherein the anode tab is disposed on the anode plate; A first adhesive tape is disposed on the cathode plate adjacent to the anode tab. The first adhesive tape is disposed on the side of the cathode plate opposite to the anode tab. The projection of the first adhesive tape in a first direction corresponds to the projection of the anode tab in a first direction. The first direction is the stacking direction of the anode plate and the cathode plate.

2. The battery cell according to claim 1, characterized in that, The cathode sheet has a first groove, which is used to accommodate the first adhesive paper.

3. The battery cell according to claim 2, characterized in that, The portion of the projection of the anode tab along the first direction onto the anode sheet is the overlapping area. The overlapping area is located within the projection of the first adhesive tape along the first direction. The portion of the edge of the projection of the anode tab along the first direction onto the anode sheet is the overlapping edge. The distance between the edge of the projection of the first adhesive tape onto the anode sheet along the first direction and the overlapping edge is not less than 1 mm.

4. The battery cell according to claim 1, characterized in that, It also includes a second groove and a second adhesive tape. The second groove is formed on the anode sheet and is used to accommodate the anode tab. The second adhesive tape is disposed on both sides of the anode sheet and covers the surface of the second groove along the first direction.

5. The battery cell according to claim 4, characterized in that, A third groove is provided on the side of the cathode plate adjacent to the anode tab facing the anode tab. The third groove faces the anode tab and is used to accommodate the portion of the anode tab protruding from the second groove along the first direction.

6. The battery cell according to claim 5, characterized in that, The battery cell also includes a third adhesive paper covering the third groove, wherein the projection of the second groove in the first direction is located within the projection of the third adhesive paper in the first direction.

7. The battery cell according to claim 5, characterized in that, The cathode plates adjacent to the anode tab are a first cathode plate and a second cathode plate, respectively. The third groove on the first cathode plate and the third groove on the second cathode plate are symmetrically arranged on both sides of the anode tab.

8. The battery cell according to claim 1, characterized in that, The anode plate is provided with a plurality of anode tabs, which are spaced apart in a second direction, the second direction being the extension direction of the anode plate, and the projections of the plurality of anode tabs in the first direction are spaced apart from each other.

9. The battery cell according to claim 8, characterized in that, The interval between the projections of the plurality of anode tabs in the first direction is not less than 5 mm.

10. The battery cell according to claim 4, characterized in that, The first adhesive tape has a dimension of A in the second direction, the anode tab has a dimension of B in the second direction, the second direction is the extension direction of the anode sheet, the second groove has a dimension of C in the second direction, C > B, and 1.5C ≥ A ≥ 0.5B.

11. The battery cell according to claim 4 or 10, characterized in that, The first adhesive tape has a dimension D in the third direction. The anode tab has a welding portion that overlaps with the second groove in the first direction. The welding portion has a dimension E in the third direction, which is the width direction of the anode sheet. The second groove has a dimension F in the third direction, where F > E and 1.5F ≥ D ≥ 0.5E.

12. A battery, characterized in that, Includes the battery cell according to any one of claims 1-11.

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