Battery cell and battery
By designing staggered electrolyte storage tanks in the battery cell, the problem of electrolyte consumption caused by lithium deposition is solved, extending the battery cell life, improving safety, and reducing the risk of short circuits.
Patent Information
- Application Number
- CN202422974738.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-03
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2034-12-03
AI Technical Summary
During long-term charge-discharge cycles, lithium ions cannot be embedded in the negative electrode material, leading to lithium deposition, which consumes electrolyte, reduces the number of charge-discharge cycles, shortens the service life, and increases safety risks.
In the battery cell, electrolyte storage tanks are formed on both sides of the positive and negative electrode plates. The electrolyte storage tanks are staggered along the diaphragm to store electrolyte and replenish the electrolyte consumed by lithium deposition. The staggered design also increases the structural strength and prevents the electrolyte storage tanks from deforming.
It effectively replenishes electrolyte, extends cell life, improves safety, reduces short-circuit risk, and increases cell flatness and structural strength.
Smart Images
Figure CN223693138U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery technology field especially relates to a kind of battery cell and battery. BACKGROUND
[0002] The battery cell of lithium battery cannot embed part of lithium ion in atomic layer of negative pole in long-term charge-discharge cycle process, further causes lithium deposition, lithium deposition can consume electrolyte, too little electrolyte not only can reduce the charge-discharge cycle times of battery cell, lead to service life reduction, and easily cause battery cell short circuit, poor safety. SUMMARY
[0003] The utility model at least solves one of the technical problems existing in the prior art.The utility model provides a kind of battery cell, it is convenient to supplement the electrolyte consumed due to lithium deposition, avoid the charge-discharge cycle times of battery cell and cause battery cell short circuit due to too little electrolyte, longer service life, better safety.
[0004] The utility model further provides a kind of battery with the above-mentioned battery cell.
[0005] According to the battery cell of the utility model first aspect embodiment, including positive sheet, negative sheet and diaphragm, the surface of the thickness direction of the two sides of the positive sheet is formed with first liquid storage groove respectively, the surface of the thickness direction of the two sides of the negative sheet is formed with second liquid storage groove respectively, the diaphragm is located between the positive sheet and the negative sheet, the positive sheet, the negative sheet and the diaphragm are laminated and wound, wherein, the first liquid storage groove and the second liquid storage groove covered by the same diaphragm are disposed in the thickness direction of the diaphragm, and the first liquid storage groove and the second liquid storage groove are used to store electrolyte.
[0006] According to the battery cell of the utility model embodiment, at least has following beneficial effects:
[0007] In the first liquid storage groove of positive sheet and the second liquid storage groove of negative sheet, there is electrolyte, when lithium deposition and consume part of electrolyte, the electrolyte in the first liquid storage groove and the second liquid storage groove can quickly supplement the electrolyte consumed on both sides of diaphragm, avoid the charge-discharge cycle times of battery cell and cause battery cell short circuit due to too little electrolyte on both sides of diaphragm, longer service life, better safety, and the first liquid storage groove and the second liquid storage groove covered by the same diaphragm are disposed in the thickness direction of diaphragm, the first liquid storage groove and the second liquid storage groove do not overlap in the thickness direction of diaphragm, can increase structural strength, avoid the deformation of first liquid storage groove and second liquid storage groove when being extruded is too large and reduces storage space, so that the first liquid storage groove and the second liquid storage groove can store more electrolyte, further improve the service life and safety of battery cell, in addition, can reduce the concave of battery cell, improve the flatness of battery cell.
[0008] According to some embodiments of the present application, the positive plate comprises a first current collector and a first coating layer on both sides of the first current collector in the thickness direction, and the first coating layer forms the first liquid storage groove.
[0009] According to some embodiments of the present application, the thickness dimension of the first liquid storage groove is H1, the thickness dimension of the first coating layer is H2, and the following conditions are met: 0.2≤H1 / H2≤0.35; and / or, the width dimension of the first liquid storage groove is L1, the width dimension of the first coating layer is L2, and the following conditions are met: 0.1≤L1 / L2≤0.15.
[0010] According to some embodiments of the present application, the negative plate comprises a second current collector and a second coating layer on both sides of the second current collector in the thickness direction, and the second coating layer forms the second liquid storage groove.
[0011] According to some embodiments of the present application, the thickness dimension of the second liquid storage groove is H3, the thickness dimension of the second coating layer is H4, and the following conditions are met: 0.2≤H3 / H4≤0.35; and / or, the width dimension of the second liquid storage groove is L3, the width dimension of the second coating layer is L4, and the following conditions are met: 0.1≤L3 / L4≤0.15.
[0012] According to some embodiments of the present application, the first liquid storage groove on both sides of the positive plate in the thickness direction is arranged in a staggered manner along the thickness direction of the positive plate; and / or, the second liquid storage groove on both sides of the negative plate in the thickness direction is arranged in a staggered manner along the thickness direction of the negative plate.
[0013] According to some embodiments of the present application, the first liquid storage groove is arranged as an arc-shaped groove; and / or, the second liquid storage groove is arranged as an arc-shaped groove.
[0014] According to some embodiments of the present application, the cell further comprises a tab, the tab has opposite first and second ends, the first end is connected to the positive plate or the negative plate, and the thickness dimension of the tab gradually decreases from the first end to the second end.
[0015] According to some embodiments of the present application, the thickness dimension of the first end is H5, the thickness dimension of the second end is H6, and the following conditions are met: 0.6≤H6 / H5≤0.8.
[0016] The battery according to the second aspect of the present application comprises the cell according to the first aspect of the present application.
[0017] The battery according to the present application has at least the following beneficial effects:
[0018] The electric core adopting the first aspect of the utility model can conveniently supplement the electrolyte consumed by lithium deposition, avoid too little electrolyte to reduce the charge-discharge cycle number of the electric core and cause short circuit of the electric core, have longer service life and better safety, the first liquid storage groove and the second liquid storage groove covered by the same diaphragm are arranged in a staggered manner along the thickness direction of the diaphragm, the structure strength can be increased, deformation of the first liquid storage groove and the second liquid storage groove at the storage space is reduced when the electric core is extruded, the first liquid storage groove and the second liquid storage groove can store more electrolyte, the service life and safety of the electric core are further improved, in addition, the electric core can be prevented from being concave and the flatness of the electric core can be improved.
[0019] Additional aspects and advantages of the utility model will be partially given in the following description, some additional aspects and advantages will become obvious from the following description or be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS
[0020] The utility model will be further explained in combination with the drawings and examples, wherein:
[0021] Figure 1 It is the partial sectional view of the electric core of the utility model;
[0022] Figure 2 It is the explosion schematic view of Figure 1
[0023] Figure 3 It is the installation schematic view of the tab;
[0024] Figure 4 It is the thickness size schematic view of the tab.
[0025] Reference Signs:
[0026] Positive plate 100;First liquid storage groove 101;First current collector 102;First coating layer 103;
[0027] Negative plate 200;Second liquid storage groove 201;Second current collector 202;Second coating layer 203;
[0028] Diaphragm 300;
[0029] Tab 400;First end 401;Second end 402. DETAILED DESCRIPTION
[0030] The embodiments of the utility model will be described in detail below, the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as the limitation of the utility model.
[0031] In the description of the utility model, it needs to be understood that, when the direction description, such as the direction or position relation indicated by up, down etc. is based on the direction or position relation shown in the drawing, it is only for the convenience of describing the utility model and simplifying the description, and it is not indicated or implied that the device or element indicated must have a particular direction, a particular direction configuration and operation, therefore it can not be understood as the limitation of the utility model.
[0032] In the description of the utility model, multiple means two or more than two. If it is described to first, second, it is only for the purpose of distinguishing technical features, and can not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.
[0033] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection etc. should be understood broadly, and the person skilled in the art can determine the specific meaning of the above words in the utility model in combination with the specific content of the technical scheme.
[0034] With the development of science and technology, lithium battery is more and more widely used in consumer electronics and new energy vehicles and other fields. In the long-term charge and discharge cycle process of the lithium battery cell, part of the lithium ions cannot be embedded in the atomic layer of the negative electrode material such as graphite negative electrode, thereby causing lithium deposition, and lithium deposition will consume electrolyte, and too little electrolyte will not only reduce the charge and discharge cycle times of the cell, resulting in reduced service life of the cell, and too little electrolyte is easy to cause short circuit of the cell, resulting in poor safety.
[0035] Therefore, the utility model provides a kind of cell and battery, which can effectively improve the above problems.
[0036] The following refers to Figures 1 to 4 The cell and battery according to the embodiments of the utility model are described.
[0037] According to the cell of the first aspect of the utility model embodiment, as Figures 1 to 3 As shown, it includes positive sheet 100, negative sheet 200 and diaphragm 300, wherein diaphragm 300 is located between positive sheet 100 and negative sheet 200, and positive sheet 100, negative sheet 200 and diaphragm 300 are stacked and wound to form a wound cell. For example, the number of positive sheet 100 can be one, the number of negative sheet 200 can be one, and the number of diaphragm 300 can be two. After stacking and winding, one of the diaphragms 300 is located between one side of the thickness direction of the positive sheet 100 and one side of the thickness direction of the negative sheet 200, and the other diaphragm 300 is located between the other side of the thickness direction of the positive sheet 100 and the other side of the thickness direction of the negative sheet 200. Of course, the number of positive sheet 100, negative sheet 200 and diaphragm 300 can also be other, which will not be described here.
[0038] The surfaces on both sides of the thickness direction of the positive electrode sheet 100 are respectively formed with first liquid storage grooves 101, and the surfaces on both sides of the thickness direction of the negative electrode sheet 200 are respectively formed with second liquid storage grooves 201, which are used to store electrolyte. Among them, the first liquid storage grooves 101 and the second liquid storage grooves 201 covered by the same diaphragm 300 are arranged in a staggered manner along the thickness direction of the diaphragm 300, that is, along the projection in the thickness direction of the diaphragm 300, the first liquid storage grooves 101 and the second liquid storage grooves 201 covered by the same diaphragm 300 do not overlap, and there is a spacing.
[0039] In this embodiment, the first liquid storage grooves 101 of the positive electrode sheet 100 and the second liquid storage grooves 201 of the negative electrode sheet 200 all store electrolyte, when lithium is deposited and part of the electrolyte is consumed, the electrolyte in the first liquid storage grooves 101 and the second liquid storage grooves 201 can quickly supplement the electrolyte consumed on both sides of the diaphragm 300, avoid the electrolyte on both sides of the diaphragm 300 being too little to reduce the charge and discharge cycle number of the battery and cause the battery to short circuit, have a longer service life and better safety. Moreover, the first liquid storage grooves 101 and the second liquid storage grooves 201 covered by the same diaphragm 300 are arranged in a staggered manner along the thickness direction of the diaphragm 300, the first liquid storage grooves 101 and the second liquid storage grooves 201 do not overlap along the thickness direction of the diaphragm 300, and then the part of the negative electrode sheet 200 outside the second liquid storage groove 201 can support the first liquid storage groove 101 of the positive electrode sheet 100, and the part of the positive electrode sheet 100 outside the first liquid storage groove 101 can support the second liquid storage groove 201 of the negative electrode sheet 200, in this way, the structural strength can be increased, when being pressed, the deformation of the first liquid storage groove 101 and the second liquid storage groove 201 can be avoided to reduce the storage space, so that the first liquid storage groove 101 and the second liquid storage groove 201 can store more electrolyte, further improve the service life and safety of the battery, in addition, the concave of the battery can be reduced, and the flatness of the battery can be improved.
[0040] Reference Figure 1 And Figure 2As shown, in some embodiments of the utility model, the positive pole piece 100 includes the first current collector 102 and the first coating layer 103 on both sides of the thickness direction of the first current collector 102, and the first coating layer 103 forms the first liquid storage groove 101. The first current collector 102 can be a metal foil, for example, it can be an aluminum foil, of course, the first current collector 102 can also be a composite current collector, the first coating layer 103 can include positive active material, conductive agent and binder, etc., these components are mixed in a certain proportion to form slurry, which is coated on the first current collector 102 by coating process, the first coating layer 103 can include the first equal-thickness area and the first thinning area, and the first thinning area forms the first liquid storage groove 101. In the embodiment, the first liquid storage groove 101 is formed by the first coating layer 103, so that the electrolyte consumed by lithium deposition in the first liquid storage groove 101 can be quickly supplemented, and the electrolyte supplementing effect is better.
[0041] Reference Figure 2 As shown, in some embodiments of the utility model, the thickness size of the first liquid storage groove 101 is H1, the thickness size of the first coating layer 103 is H2, and 0.2≤H1 / H2≤0.35 is met. For example, the thickness size H1 of the first liquid storage groove 101 can be 0.2 times, 0.25 times, 0.3 times, 0.35 times or other suitable proportions of the thickness size H2 of the first coating layer 103. In the embodiment, the ratio of the thickness size H1 of the first liquid storage groove 101 to the thickness size H2 of the first coating layer 103 is between 0.2 and 0.35, so that not only can the first liquid storage groove 101 store as much electrolyte as possible, but also the part of the first coating layer 103 where the first liquid storage groove 101 is formed, that is, the first thinning area, can be prevented from being too thin to affect the performance of the battery cell.
[0042] Reference Figure 2 As shown, in some embodiments of the utility model, the width size of the first liquid storage groove 101 is L1, the width size of the first coating layer 103 is L2, and 0.1≤L1 / L2≤0.15 is met. For example, the width size L1 of the first liquid storage groove 101 can be 0.1 times, 0.11 times, 0.12 times, 0.13 times, 0.14 times, 0.15 times or other suitable proportions of the width size L2 of the first coating layer 103. In the embodiment, the ratio of the width size L1 of the first liquid storage groove 101 to the width size L2 of the first coating layer 103 is between 0.1 and 0.15, so that not only can the first liquid storage groove 101 store as much electrolyte as possible, but also the first equal-thickness area of the first coating layer 103 can be prevented from being too narrow to affect the performance of the battery cell.
[0043] Reference Figure 1 And Figure 2As shown, in some embodiments of the present application, the negative plate 200 includes a second current collector 202 and a second coating layer 203 on both sides of the second current collector 202 in the thickness direction, and the second coating layer 203 forms a second liquid storage groove 201. The second current collector 202 can be a metal foil, for example, a copper foil. Of course, the second current collector 202 can also be a composite current collector. The second coating layer 203 can include negative active material, conductive agent, binder and the like. These components are mixed in a certain proportion to form a slurry, which is coated on the second current collector 202 by a coating process. The second coating layer 203 can include a second uniform thickness area and a second thinned area, and the second thinned area forms the second liquid storage groove 201. The second uniform thickness area can be opposite the first liquid storage groove 101 in the thickness direction of the separator 300, and the first uniform thickness area can be opposite the second liquid storage groove 201 in the thickness direction of the separator 300. In this embodiment, the second liquid storage groove 201 is formed by the second coating layer 203. In this way, the electrolyte consumed by lithium deposition in the second liquid storage groove 201 can be quickly supplemented, and the electrolyte supplementing effect is better.
[0044] Reference Figure 2 As shown, in some embodiments of the present application, the thickness dimension of the second liquid storage groove 201 is H3, and the thickness dimension of the second coating layer 203 is H4, and 0.2≤H3 / H4≤0.35 is satisfied. For example, the thickness dimension H3 of the second liquid storage groove 201 can be 0.2 times, 0.25 times, 0.3 times, 0.35 times or other suitable proportions of the thickness dimension H4 of the second coating layer 203. In this embodiment, the ratio of the thickness dimension H3 of the second liquid storage groove 201 to the thickness dimension H4 of the second coating layer 203 is between 0.2 and 0.35. In this way, not only can the second liquid storage groove 201 store as much electrolyte as possible, but also the part of the second coating layer 203 where the second liquid storage groove 201 is formed, that is, the second thinned area, can avoid being too thin to affect the performance of the battery cell.
[0045] Reference Figure 2 As shown, in some embodiments of the present application, the width dimension of the second liquid storage groove 201 is L3, and the width dimension of the second coating layer 203 is L4, and 0.1≤L3 / L4≤0.15 is satisfied. For example, the width dimension L3 of the second liquid storage groove 201 can be 0.1 times, 0.11 times, 0.12 times, 0.13 times, 0.14 times, 0.15 times or other suitable proportions of the width dimension L4 of the second coating layer 203. In this embodiment, the ratio of the width dimension L3 of the second liquid storage groove 201 to the width dimension L4 of the second coating layer 203 is between 0.1 and 0.15. In this way, not only can the second liquid storage groove 201 store as much electrolyte as possible, but also the second uniform thickness area of the second coating layer 203 can avoid being too narrow in width to affect the performance of the battery cell.
[0046] ReferenceFigure 1 And Figure 2 As shown in the drawings, in some embodiments of the present application, the first liquid storage groove 101 on both sides of the positive plate 100 in the thickness direction is staggered along the thickness direction of the positive plate 100. That is, the first liquid storage groove 101 on both sides of the positive plate 100 in the thickness direction does not overlap along the thickness direction of the positive plate 100, thereby further increasing the structural strength of the positive plate 100, and when being pressed, the positive plate 100 can further avoid excessive deformation at the first liquid storage groove 101 to reduce the storage space, so that the first liquid storage groove 101 can store more electrolyte, further improving the service life and safety of the battery cell, and further reducing the concave of the battery cell, further improving the flatness of the battery cell.
[0047] Reference Figure 1 And Figure 2 As shown in the drawings, in some embodiments of the present application, the second liquid storage groove 201 on both sides of the negative plate 200 in the thickness direction is staggered along the thickness direction of the negative plate 200. That is, the second liquid storage groove 201 on both sides of the negative plate 200 in the thickness direction does not overlap along the thickness direction of the negative plate 200, thereby further increasing the structural strength of the negative plate 200, and when being pressed, the negative plate 200 can further avoid excessive deformation at the second liquid storage groove 201 to reduce the storage space, so that the second liquid storage groove 201 can store more electrolyte, further improving the service life and safety of the battery cell, and further reducing the concave of the battery cell, further improving the flatness of the battery cell.
[0048] Reference Figure 1 And Figure 2 As shown in the drawings, in some embodiments of the present application, the first liquid storage groove 101 is arranged as an arc-shaped groove. In this embodiment, the first liquid storage groove 101 is arranged as an arc-shaped groove, so that the electrolyte in the first liquid storage groove 101 has smaller resistance when spreading to the surface of the first coating layer 103, and the spreading is more smooth, thereby making it more convenient and fast to supplement the electrolyte.
[0049] Reference Figure 1 And Figure 2 As shown in the drawings, in some embodiments of the present application, the second liquid storage groove 201 is arranged as an arc-shaped groove. In this embodiment, the second liquid storage groove 201 is arranged as an arc-shaped groove, so that the electrolyte in the second liquid storage groove 201 has smaller resistance when spreading to the surface of the second coating layer 203, and the spreading is more smooth, thereby making it more convenient and fast to supplement the electrolyte.
[0050] Reference Figure 3 And Figure 4As shown, in some embodiments of this utility model, the battery cell further includes a tab 400, which has a first end 401 and a second end 402. The first end 401 is connected to the positive electrode 100 or the negative electrode 200, and the thickness of the tab 400 gradually decreases from the first end 401 to the second end 402. For example, the first current collector 102 of the positive electrode 100 can be welded to the first end 401 of the tab 400, and the second current collector 202 of the negative electrode 200 can be welded to the first end 401 of the tab 400. In this embodiment, the thickness of the tab 400 gradually decreases from the first end 401 to the second end 402. This reduces the risk of the tab 400 bending or even breaking when the battery cell is dropped, thus improving safety. Furthermore, after the tab 400 is welded, it reduces the likelihood of the tab 400 protruding from the surface of the first coating layer 103 or the second coating layer 203 in the thickness direction, making the tab 400 more flush with the first coating layer 103 or the second coating layer 203 in the thickness direction, thereby improving the flatness of the battery cell.
[0051] refer to Figure 4 As shown, in some embodiments of this utility model, the thickness of the first end 401 is H5, and the thickness of the second end 402 is H6, satisfying: 0.6 ≤ H6 / H5 ≤ 0.8. For example, the thickness H6 of the second end 402 can be 0.6 times, 0.7 times, 0.8 times, or other suitable ratios of the thickness H5 of the first end 401. Taking 0.8 times as an example, the thickness of the first end 401 can be 0.1 mm, and the thickness of the second end 402 can be 0.08 mm. In this embodiment, the ratio of the thickness H6 of the second end 402 to the thickness H5 of the first end 401 is between 0.6 and 0.8, which makes the tab 400 more resistant to bending and breakage, and also improves the flatness of the battery cell.
[0052] The battery according to a second aspect embodiment of the present invention includes the battery cell described in the first aspect embodiment.
[0053] According to the battery of the present invention, by adopting the battery cell of the first aspect embodiment of the present invention, it is convenient to replenish the electrolyte consumed by lithium deposition, avoid the reduction of the charge-discharge cycle number of the battery cell due to insufficient electrolyte and the occurrence of short circuits in the battery cell, resulting in a longer service life and better safety. Moreover, the first liquid storage tank 101 and the second liquid storage tank 201 covered by the same separator 300 are staggered along the thickness direction of the separator 300, which can increase the structural strength and avoid excessive deformation of the first liquid storage tank 101 and the second liquid storage tank 201 when squeezed, thus reducing the storage space. This allows the first liquid storage tank 101 and the second liquid storage tank 201 to store more electrolyte, further improving the service life and safety of the battery cell. In addition, it can also reduce the occurrence of dents in the battery cell and improve the flatness of the battery cell.
[0054] It should be noted that since the battery can adopt all the technical solutions of the battery cell of the first aspect embodiment, it at least has all the beneficial effects brought by the technical solutions of the first aspect embodiment, and these additional beneficial effects will not be described here.
[0055] It can be understood that other configurations and operations of the battery according to the embodiments of the present application are known to those skilled in the art, and will not be described in detail here.
[0056] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.
Claims
1. An electric cell, characterized by, The positive electrode sheet has a first liquid storage groove formed on each of the two surfaces in the thickness direction thereof. The negative electrode sheet has a second liquid storage groove formed on each of the two surfaces in the thickness direction thereof. The separator is arranged between the positive electrode sheet and the negative electrode sheet, and the positive electrode sheet, the negative electrode sheet and the separator are laminated and wound. The first liquid storage groove and the second liquid storage groove covered by the same separator are arranged in a staggered manner in the thickness direction of the separator, and the first liquid storage groove and the second liquid storage groove are used for storing electrolyte. The positive electrode sheet comprises a first current collector and a first coating layer on each of the two surfaces in the thickness direction of the first current collector, and the first coating layer forms the first liquid storage groove.
2. The electric cell of claim 1, wherein, The thickness dimension of the first liquid storage groove is H1, the thickness dimension of the first coating layer is H2, and 0.2≤H1 / H2≤0.35 is satisfied; and / or, the width dimension of the first liquid storage groove is L1, the width dimension of the first coating layer is L2, and 0.1≤L1 / L2≤0.15 is satisfied.
3. The electric cell of claim 2, wherein, The negative electrode sheet comprises a second current collector and a second coating layer on each of the two surfaces in the thickness direction of the second current collector, and the second coating layer forms the second liquid storage groove.
4. The electric cell of claim 1, wherein, The thickness dimension of the second liquid storage groove is H3, the thickness dimension of the second coating layer is H4, and 0.2≤H3 / H4≤0.35 is satisfied; and / or, the width dimension of the second liquid storage groove is L3, the width dimension of the second coating layer is L4, and 0.1≤L3 / L4≤0.15 is satisfied.
5. The electric cell of claim 4, wherein, The first liquid storage groove on each of the two surfaces in the thickness direction of the positive electrode sheet is arranged in a staggered manner in the thickness direction of the positive electrode sheet; and / or, the second liquid storage groove on each of the two surfaces in the thickness direction of the negative electrode sheet is arranged in a staggered manner in the thickness direction of the negative electrode sheet.
6. The electric cell of claim 1, wherein, The first liquid storage groove is arranged as an arc-shaped groove; and / or, the second liquid storage groove is arranged as an arc-shaped groove.
7. The electric cell of claim 1, wherein, The battery cell further comprises:
8. The electric cell of claim 1, wherein, The tab has opposite first and second ends, the first end is connected to the positive electrode sheet or the negative electrode sheet, and the thickness dimension of the tab gradually decreases from the first end to the second end. The thickness dimension of the first end is H5, the thickness dimension of the second end is H6, and 0.6≤H6 / H5≤0.8 is satisfied.
9. The electric cell of claim 8, wherein, The battery cell comprises the battery cell according to any one of claims 1 to 9.
10. A battery, characterized by