Tab, battery cell and battery
By setting groove areas on the first and second surfaces of the electrode body, the problem of the electrode contacting the shell wall and hindering the flow of electrolyte is solved, realizing the effective flow and storage of electrolyte, and improving the wetting efficiency and cycle performance of lithium-ion batteries.
Patent Information
- Application Number
- CN202422938273.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-11-29
AI Technical Summary
In existing technologies, when lithium-ion batteries expand, the tabs come into contact with the casing wall, hindering the flow of electrolyte, reducing wetting efficiency, and increasing the risk of battery cycle failure.
A groove area is provided on the first and second surfaces of the electrode body. The groove area is recessed on the other side along the corresponding surface to form an electrolyte storage and flow path. The electrode is designed to be staggered to maintain strength.
It enhances the wetting effect and retention capacity of the electrolyte, increases the flow rate, avoids cell cycle failure, extends battery life, and improves safety.
Smart Images
Figure CN223527350U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of battery, concretely relates to tab, electric core and battery. BACKGROUND
[0002] Lithium ion battery as a new type of secondary battery has the advantages of high energy density and power density, high working voltage, light weight, small size, long cycle life, good safety, green environmental protection and the like, and has broad application prospects in portable electrical appliances, electric tools, large energy storage, electric transportation power supply and the like.
[0003] At present, the winding design of the button type electric core mainly adopts the external welding mode, and the tab is welded at the end of the pole piece. After the winding process is completed, the tab is located at the outer side of the electric core, and the maximum diameter of the electric core is just located at the position of the tab. When the electric core is placed in the battery shell and expands, the tab will contact the shell wall and produce resistance, thereby hindering the flow of electrolyte and reducing the infiltration efficiency of the electrolyte. This condition will significantly increase the risk of cycle failure in the subsequent cycle use of the battery. SUMMARY
[0004] The utility model discloses a tab, electric core and battery to solve the technical problem that the tab contacts the shell wall when the electric core expands, hinders the flow of electrolyte, reduces the infiltration efficiency and increases the risk of cycle failure of the battery in the prior art.
[0005] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:
[0006] Firstly, the utility model provides a tab, which comprises a tab body, along the thickness direction of the tab body, the tab body has oppositely arranged first and second surfaces, the first surface is provided with a first slot position area, and the first slot position area is recessed along the direction from the first surface to the second surface; and / or, the second surface is provided with a second slot position area, and the second slot position area is recessed along the direction from the second surface to the first surface.
[0007] In some embodiments, the first slot position area and the second slot position area are distributed in a staggered manner.
[0008] In some embodiments, the first slot position area comprises a plurality of first grooves arranged at intervals.
[0009] And / or, the second slot position area comprises a plurality of second grooves arranged at intervals.
[0010] In some embodiments, the depth H2 of each first groove and the thickness H1 of the tab body satisfy the relationship: 6% H1≤H2≤50% H1.
[0011] And / or, the depth H3 of each of the second grooves and the thickness H1 of the tab body satisfy the relationship: 6% H1≤H3≤50% H1.
[0012] In some embodiments, the total area S2 of the orthographic projection of the plurality of first grooves on the first face along the thickness direction of the tab body, and the area S1 of the first face, satisfy the relationship: 20% S1≤S2≤40% S1.
[0013] And / or, the total area S4 of the orthographic projection of the plurality of second grooves on the second face, and the area S3 of the second face, satisfy the relationship: 20% S3≤S4≤40% S3.
[0014] In some embodiments, at least one end of at least part of the first grooves and / or at least one end of at least part of the second grooves extends to and communicates with the edge of the tab body.
[0015] In some embodiments, the orthographic projection shape of each of the first grooves on the first face along the thickness direction of the tab body is point-like, line-like or a geometric pattern.
[0016] And / or, the orthographic projection shape of each of the second grooves on the second face is point-like, line-like or a geometric pattern.
[0017] In some embodiments, the orthographic projection shapes of the plurality of first grooves are the same or different.
[0018] And / or, the orthographic projection shapes of the plurality of second grooves are the same or different.
[0019] And / or, the orthographic projection shape of the first grooves is the same as or different from the orthographic projection shape of the second grooves.
[0020] In a second aspect, the utility model provides a kind of electric core, including electric core body, first tab and second tab, one end of the first tab and one end of the second tab are all arranged in the circumferential side of the electric core body, the other end of the first tab extends and is bent to the bottom of the electric core body, the other end of the second tab extends and is bent to the end of the electric core body, wherein the first tab and / or the second tab are the tab of above-mentioned embodiment.
[0021] In a third aspect, the utility model provides a kind of battery, including shell, cover plate component and the cell of above-mentioned embodiment, the shell has accommodating cavity, the cell is arranged in the accommodating cavity, the cover plate component is covered in the opening of the shell, the cover plate component includes first cover plate, second cover plate and insulating seal, first cover plate is arranged around the circumferential side of second cover plate, the edge of first cover plate is connected with the shell, the insulating seal is arranged between first cover plate and second cover plate, the first lug is electrically connected with the bottom wall of the shell, and the second lug is electrically connected with the second cover plate.
[0022] Compared with prior art, the utility model obtains the beneficial effect that:
[0023] The utility model discloses a tab, by setting first slot area in the first face of tab body, first slot area is recessed along the direction of first face to second face, effectively make first slot area can be used to store electrolyte, to enhance the infiltration effect and the holding capacity of electrolyte of cell.This setting structure effectively constructs the effective flow path of electrolyte, improves the flow rate of electrolyte, battery in the process of charge-discharge cycle use, can effectively avoid the cycle failure problem of cell caused by local electrolyte loss or channel blockage.Similarly, by setting second slot area in the second face of tab body, second slot area is recessed along the direction of second face to first face, effectively make second slot area can be used to store electrolyte, to enhance the infiltration effect and the holding capacity of electrolyte of cell.This setting structure effectively constructs the effective flow path of electrolyte, improves the flow rate of electrolyte, battery in the process of charge-discharge cycle use, can effectively avoid the cycle failure problem of cell caused by local electrolyte loss or channel blockage.
[0024] Additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS
[0025] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in embodiment or prior art description, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without paying the creativity of labor.
[0026] Figure 1 It is the structural schematic diagram of the battery of the utility model.
[0027] Figure 2 It is the structural schematic diagram of the tab of the utility model.
[0028] Figure 3 As Figure 2 Enlarged structural schematic view at A.
[0029] Figure 4 Structure schematic view two of the tab of the utility model.
[0030] Figure 5 Structure schematic view three of the tab of the utility model.
[0031] Among them, the sign explanation is as follows:
[0032] 100, battery;
[0033] 10, battery cell; 11, tab; 111, first surface; 112, second surface; 113, first slot area; 114, second slot area; 12, battery cell body; 13, first tab; 14, second tab; 15, insulating layer;
[0034] 20, shell;
[0035] 30, cover plate assembly; 31, first cover plate; 32, second cover plate; 321, second base portion; 322, second protruding portion; 33, insulating sealing piece; 331, first base portion; 332, first protruding portion;
[0036] A, thickness direction of the tab body. DETAILED DESCRIPTION
[0037] Some terms are used in the description and claims herein for the purpose of describing particular components. Those skilled in the art will appreciate that different manufacturers can refer to a component by different names and / or refer to a component by the same name but associate different characteristics with the component. It is intended that the scope of the claims hereof encompass all components that are within the scope of the claims hereof, along with their equivalents.
[0038] In addition, the terms "first", "second", and the like, are used only to describe different components and do not imply these components must be in a particular sequence, either temporally or spatially.
[0039] The term "and / or" in the present utility model is merely a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present invention generally represents an "or" relationship between the front and rear associated objects.
[0040] The "multiple" appearing in the utility model refers to two or more (including two).
[0041] In the utility model, unless specifically defined and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can be detachable connection, or integrally connected; can be mechanical connection, can be electrical connection; can be directly connected, can be indirectly connected through an intermediate medium, can be internal communication of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0042] The utility model will be described below in combination with the accompanying drawings Figures 1-5 The technical solutions in the embodiments of the utility model are clearly and completely described, obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary skilled in the art without creative labor belong to the protection scope of the utility model.
[0043] Please refer to Figure 1 The battery 100 of the embodiment of the utility model, including shell 20, cover plate assembly 30 and electric core 10, shell 20 has accommodation cavity, and electric core 10 is arranged in the accommodation cavity, and cover plate assembly 30 is covered in the opening of shell 20.
[0044] The electric core 10 of the embodiment of the utility model, including electric core body 12, first tab 1311 and second tab 1411, one end of first tab 1311 and one end of second tab 1411 are arranged in the circumferential side of electric core body 12, the other end of first tab 1311 is extended and bent to the bottom of electric core body 12, and the other end of second tab 1411 is extended and bent to the end of electric core body 12. By extending and bending the other end of first tab 1311 to the bottom of electric core body 12, and extending and bending the other end of second tab 1411 to the end of electric core body 12, first tab 1311 and second tab 1411 are effectively pre-bent, which facilitates the subsequent connection of first tab 1311 and second tab 1411.
[0045] In some embodiments, the cover plate assembly 30 comprises a first cover plate 31, a second cover plate 32, and an insulating seal 33, the first cover plate 31 is arranged around the periphery of the second cover plate 32, the edge of the first cover plate 31 is connected with the shell 20, the insulating seal 33 is arranged between the first cover plate 31 and the second cover plate 32, the first tab 1311 is electrically connected with the bottom wall of the shell 20, and the second tab 1411 is electrically connected with the second cover plate 32. Through the cooperation of the first cover plate 31, the second cover plate 32 and the insulating seal 33, the insulating seal 33 is used to isolate the first cover plate 31 and the second cover plate 32, and the first cover plate 31 and the second cover plate 32 are effectively insulated.
[0046] It can be understood that the polarities of the first tab 1311 and the second tab 1411 are opposite, the first tab 1311 and the second tab 1411 are the positive tab 11, and one of the first tab 1311 and the second tab 1411 is the negative tab 11.
[0047] It can be understood that, in order to avoid the first tab 1311 and the second tab 1411 contacting the side wall of the shell 20 at the same time, causing the battery 100 to be short-circuited, an insulating layer 15 is arranged between the first tab 1311 and the side wall of the shell 20, and between the second tab 1411 and the side wall of the shell 20. Specifically, the insulating layer 15 can be a rubber paper or a diaphragm.
[0048] In some embodiments, the insulating seal 33 comprises a first base portion 331 and a first protruding portion 332, the first base portion 331 abuts the lower surface of the first cover plate 31, the first protruding portion 332 is arranged at one end of the first base portion 331 close to the second cover plate 32, and the first protruding portion 332 is arranged between the first cover plate 31 and the second cover plate 32. Through the cooperation of the first base portion 331 and the first protruding portion 332, the first protruding portion 332 is arranged between the first cover plate 31 and the second cover plate 32, effectively ensuring the insulation effect between the first cover plate 31 and the second cover plate 32. The first base portion 331 abuts the lower surface of the first cover plate 31, effectively avoiding the second tab 1411 contacting the first cover plate 31, causing the battery 100 to be short-circuited.
[0049] It can be understood that the first base portion 331 and the first protruding portion 332 are integrally formed.
[0050] In some embodiments, the second cover plate 32 comprises a second base portion 321 and a second protruding portion 322, the second protruding portion 322 is arranged on the second base portion 321, the first protruding portion 332 is located between the second protruding portion 322 and the second cover plate 32, the edge of the second base portion 321 extends to the lower surface of the first base portion 331, and the first base portion 331 is located between the first cover plate 31 and the second base portion 321, and the second tab 1411 is electrically connected with the second base portion 321. By using the second base portion 321 and the second protruding portion 322 in cooperation, the edge of the second base portion 321 extends to the lower surface of the first base portion 331, which effectively increases the contact area between the second tab 1411 and the second base portion 321, thereby ensuring the connection effect of the second tab 1411 and the second base portion 321, and at the same time, due to the increase of the contact area between the second tab 1411 and the base portion of the tab 11, the resistance is effectively reduced. The second protruding portion 322 is arranged on the second base portion 321, which effectively enables the second cover plate 32 to be connected with an external power source through the second protruding portion 322.
[0051] It can be understood that the second base portion 321 and the second protruding portion 322 are integrally formed.
[0052] Hereinafter, the first tab 1311 and the second tab 1411 are collectively referred to as a tab 11, and the specific embodiments are as follows:
[0053] The tab 11 of the utility model embodiment comprises a tab body, along the thickness direction a of the tab body, the tab body has a first face 111 and a second face 112 arranged oppositely, the first face 111 is provided with a first slot position area 113, the first slot position area 113 is recessed along the direction from the first face 111 to the second face 112;And / or, the second face 112 is provided with a second slot position area 114, the second slot position area 114 is recessed along the direction from the second face 112 to the first face 111.
[0054] Compared with the prior art, the tab 11 of the utility model, through setting first slot area 113 in the first face 111 of the tab body, the first slot area 113 is recessed along the direction of the first face 111 to the second face 112, effectively make the first slot area 113 can be used to store electrolyte, thereby enhancing the wettability and retention capacity of the electrolyte of the battery cell 10. This setting structure effectively builds the effective flow path of electrolyte, improves the flow rate of electrolyte, and effectively avoids the cycle failure problem of the battery cell 10 caused by the local electrolyte loss or channel blockage in the charging and discharging cycle use process of the battery 100. Similarly, by setting the second slot area 114 on the second face 112 of the tab body, the second slot area 114 is recessed along the direction of the second face 112 to the first face 111, effectively making the second slot area 114 can be used to store electrolyte, thereby enhancing the wettability and retention capacity of the electrolyte of the battery cell 10. This setting structure effectively builds the effective flow path of electrolyte, improves the flow rate of electrolyte, and effectively avoids the cycle failure problem of the battery cell 10 caused by the local electrolyte loss or channel blockage in the charging and discharging cycle use process of the battery 100.
[0055] In some embodiments, the first slot area 113 can be formed on the first face 111 by laser etching, and similarly, the second slot area 114 can be formed on the second face 112 by laser etching. Laser etching has high precision and detail control, which can accurately control the shape, size and position of the first slot area 113 and the second slot area 114, thereby improving the processing rate of the first slot area 113 and the second slot area 114.
[0056] The inventor found that when the first slot area 113 and the second slot area 114 are arranged on the tab body at the same time, the wettability and retention capacity of the electrolyte of the battery cell 10 can reach the optimal state. However, if the first slot area 113 and the second slot area 114 are arranged correspondingly, and the orthographic projection of the two in the thickness direction of the tab body overlaps or partially overlaps, it may cause the thickness of the tab body in the overlapping area to become thinner. In this case, the tab body is more likely to deform, break or fatigue failure when subjected to external force or vibration. This not only damages the electrical connection performance of the battery 100, but also may cause internal short circuit, electrolyte leakage and other safety problems of the battery 100.
[0057] In view of this, the inventors adjust the position setting of the first slot area 113 and the second slot area 114, and stagger the distribution of the first slot area 113 and the second slot area 114. The staggered distribution of the first slot area 113 and the second slot area 114 avoids the overlap of the orthographic projection in the tab body thickness direction, thereby ensuring that the tab body retains a relatively sufficient thickness in any area. This setting structure effectively improves the overall structural strength of the tab body, enabling it to better resist the risk of deformation, fracture or fatigue failure when facing external forces or vibrations. In addition, although the first slot area 113 and the second slot area 114 are staggered, they can still form effective electrolyte storage and flow channels on the tab body. Thus, it ensures that the battery cell 10 can be fully soaked and maintain good electrolyte retention capacity during the charge and discharge cycle, thereby prolonging the service life and cycle performance of the battery 100.
[0058] In some embodiments, the first slot area 113 includes a plurality of first grooves arranged at intervals; and / or, the second slot area 114 includes a plurality of second grooves arranged at intervals. By arranging a plurality of first grooves and / or a plurality of second grooves at intervals, more infiltration channels are effectively provided for the electrolyte, enabling the electrolyte to more uniformly penetrate into the battery cell 10.
[0059] In some embodiments, the plurality of first grooves are arranged in a linear arrangement; and / or, the plurality of second grooves are arranged in a linear arrangement.
[0060] By arranging a plurality of first grooves in a linear arrangement, more infiltration channels are effectively provided for the electrolyte, enabling the electrolyte to more uniformly penetrate into the battery cell 10. In addition, although the first slot area 113 weakens the structural strength of the tab body, the plurality of linearly arranged first grooves can disperse stress to some extent, reducing the risk of fracture due to stress concentration. Similarly, by arranging a plurality of second grooves in a linear arrangement, more infiltration channels are effectively provided for the electrolyte, enabling the electrolyte to more uniformly penetrate into the battery cell 10. In addition, although the second slot area 114 weakens the structural strength of the tab body, the plurality of linearly arranged second grooves can disperse stress to some extent, reducing the risk of fracture due to stress concentration.
[0061] In some embodiments, the depth H2 of each first groove and the thickness H1 of the tab body satisfy the relationship: 6% H1≤H2≤50% H1; and / or, the depth H3 of each second groove and the thickness H1 of the tab body satisfy the relationship: 6% H1≤H3≤50% H1.
[0062] By setting the depth H2 of the first groove, the depth H2 of the first groove cannot be too large or too small. When the depth H2 of the first groove is too small, i.e. H2 < 0.06H1, the shallow depth H2 of the first groove results in a small space for storing electrolyte within the first groove, thereby leading to poor wettability and retention capacity of the electrolyte by the battery cell 10. Due to insufficient wettability of the electrolyte, the utilization rate of active materials inside the battery cell 10 is reduced, resulting in accelerated capacity decay of the battery 100 in the charge-discharge cycle, shortening the service life of the battery 100. Meanwhile, poor wettability of the electrolyte can lead to blocked ion conduction inside the battery cell 10, resulting in increased internal resistance. High internal resistance not only reduces the power output capability of the battery 100, but also can cause the temperature of the battery 100 to rise during discharge, further affecting the safety and stability of the battery 100. When the depth H2 of the first groove is too large, i.e. H2 > 0.5H1, the large depth H2 of the first groove results in a large proportion of the first groove in the thickness direction a of the tab body, thereby weakening the structural strength of the tab body and making it more prone to deformation or fracture when subjected to external force or vibration. This not only can affect the electrical connection performance of the battery 100, but also can pose a threat to the overall safety of the battery 100. Therefore, the depth H2 of the first groove satisfies the relationship: 6%H1≤H2≤50%H1. Within this range, the first groove can provide sufficient space to store electrolyte, ensuring that the battery cell 10 can be fully wetted and maintain good electrolyte retention capacity during the charge-discharge cycle. This helps to improve the energy density, cycle life and power output capability of the battery 100. At the same time, the depth H2 of the first groove does not excessively weaken the structural strength of the tab body, thereby maintaining the stability and reliability of the battery 100 when subjected to external force or vibration.
[0063] Similarly, by setting the depth H3 of the second groove, the depth H3 of the second groove cannot be too large or too small. The depth H3 of the second groove satisfies the relationship: 6%H1≤H3≤50%H1. Within this range, the second groove can provide sufficient space to store electrolyte, ensuring that the battery cell 10 can be fully wetted and maintain good electrolyte retention capacity during the charge-discharge cycle. This helps to improve the energy density, cycle life and power output capability of the battery 100. At the same time, the depth H3 of the second groove does not excessively weaken the structural strength of the tab body, thereby maintaining the stability and reliability of the battery 100 when subjected to external force or vibration.
[0064] In some embodiments, the total area S2 of the orthographic projection of the plurality of first grooves on the first face 111 along the thickness direction a of the tab body, and the area S1 of the first face 111, satisfy the relationship: 20%S1≤S2≤40% S1; and / or, the total area S4 of the orthographic projection of the plurality of second grooves on the second face 112, and the area S3 of the second face 112, satisfy the relationship: 20% S3≤S4≤40% S3.
[0065] By setting the total area S2 of the orthographic projections of the multiple first grooves, the total area S2 of the orthographic projections of the multiple first grooves cannot be too large or too small. When the total area S2 of the orthographic projections of the multiple first grooves is too small, that is, S2 < 20% S1, the proportion of the total area S2 of the orthographic projections of the multiple first grooves to the area S1 of the first surface 111 is small, resulting in a small space for storing electrolyte in the first groove area 113. This leads to poor wetting effect and retention capacity of the cell 10 with electrolyte. Due to insufficient electrolyte wetting, the utilization rate of the active material inside the cell 10 is reduced, resulting in faster capacity decay of the battery 100 during charge and discharge cycles, shortening the service life of the battery 100. At the same time, poor electrolyte wetting will lead to obstructed ion conduction inside the cell 10, increasing internal resistance. High internal resistance will not only reduce the power output capability of the battery 100, but may also cause the temperature of the battery 100 to rise during discharge, further affecting the safety and stability of the battery 100. When the total area S2 of the orthographic projection of the multiple first grooves is too large, i.e., S2 > 40% S1, the total area S2 of the orthographic projection of the multiple first grooves accounts for a large proportion of the area S1 of the first surface 111, which weakens the structural strength of the electrode body, making it more susceptible to deformation or breakage under external force or vibration. This may not only affect the electrical connection performance of the battery 100, but also pose a threat to the overall safety of the battery 100. Therefore, the total area S2 of the orthographic projection of the multiple first grooves on the first surface 111 should satisfy the relationship with the area S1 of the first surface 111: 20% S1 ≤ S2 ≤ 40% S1. Within this range, the first groove area 113 can provide sufficient space to store electrolyte, ensuring that the cell 10 can be fully wetted and maintain good electrolyte retention capacity during charge and discharge cycles. This helps to improve the energy density, cycle life, and power output capability of the battery 100. At the same time, the total area S2 of the orthographic projection of the multiple first grooves is a moderate proportion of the area S1 of the first surface 111, which will not excessively weaken the structural strength of the electrode body, thereby maintaining the stability and reliability of the battery 100 when subjected to external force or vibration.
[0066] Similarly, the total area S4 of the projections of the plurality of second grooves should not be too large or too small. The total area S4 of the projections of the plurality of second grooves on the second face 112 should satisfy the relationship 20% S3≤ S4≤ 40% S3. Within this range, the second groove area 114 can provide sufficient space to store electrolyte, ensuring that the battery cell 10 can be fully soaked and maintain good electrolyte retention during the charge and discharge cycle. This helps to improve the energy density, cycle life and power output capability of the battery 100. At the same time, the total area S4 of the projections of the plurality of second grooves accounts for a moderate proportion of the area S3 of the second face 112, which does not excessively weaken the structural strength of the tab body, thereby maintaining the stability and reliability of the battery 100 when subjected to external forces or vibrations.
[0067] In some embodiments, at least one end of at least part of the first grooves and / or at least one end of at least part of the second grooves extends to the edge of the tab body and communicates with the edge of the tab body. By communicating the first grooves and / or the second grooves with the edge of the tab body, a more direct and smooth soaking channel is effectively provided for the electrolyte. This helps the electrolyte to penetrate more quickly into the battery cell 10, thereby reducing the resistance in the soaking process and improving the soaking efficiency and uniformity of the electrolyte, thereby optimizing the performance of the battery 100.
[0068] In some embodiments, along the thickness direction a of the tab body, the projection shape of each first groove on the first face 111 is point-like, line-like or geometric pattern; and / or, the projection shape of each second groove on the second face 112 is point-like, line-like or geometric pattern. The point-like, line-like or geometric pattern projection shape provides a variety of soaking paths for the electrolyte, and these shapes can guide the electrolyte to penetrate more uniformly into the battery cell 10, thereby ensuring that the battery cell 10 can be fully soaked and maintain good electrolyte retention during the charge and discharge cycle.
[0069] It can be understood that by adjusting the projection shape and distribution of the first grooves; and / or, adjusting the projection shape and distribution of the second grooves; the soaking effect of the electrolyte can be further optimized to ensure that each part of the battery cell 10 is fully soaked with electrolyte.
[0070] In some embodiments, the first plurality of grooves have the same or different orthographic projection shapes; and / or, the second plurality of grooves have the same or different orthographic projection shapes; and / or, the orthographic projection shape of the first grooves is the same as or different from the orthographic projection shape of the second grooves. By setting the shapes and distribution of the first grooves and the second grooves, the overall strength of the tab body can be ensured while maintaining sufficient wicking channels. By setting the first grooves and the second grooves with different shapes, different areas and structural features of the battery cell 10 can be optimized to ensure that the electrolyte can penetrate more uniformly into the interior of the battery cell 10. In addition, this setting structure provides greater flexibility, so that the battery 100 can flexibly adjust the shapes and distribution of the first grooves and the second grooves according to specific application requirements and performance requirements.
[0071] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.
Claims
1. A tab, characterized by: The tab body includes a first face (111) and a second face (112) oppositely arranged along a thickness direction (a) of the tab body, the first face (111) is provided with a first groove area (113) recessed along the first face (111) towards the second face (112), and / or the second face (112) is provided with a second groove area (114) recessed along the second face (112) towards the first face (111).
2. The tab of claim 1, wherein: The first groove area (113) and the second groove area (114) are distributed in a staggered manner.
3. The tab according to any one of claims 1 to 2, wherein: The first groove area (113) includes a plurality of first grooves arranged at intervals. And / or, the second groove area (114) includes a plurality of second grooves arranged at intervals.
4. The tab of claim 3, wherein: The depth H2 of each first groove and the thickness H1 of the tab body satisfy the relationship: 6% H1≤H2≤50% H1. And / or, the depth H3 of each second groove and the thickness H1 of the tab body satisfy the relationship: 6% H1≤H3≤50% H1.
5. The tab of claim 3, wherein: The total area S2 of the orthographic projection of a plurality of first grooves on the first face (111) along the thickness direction (a) of the tab body satisfies the relationship: 20% S1≤S2≤40% S1. And / or, the total area S4 of the orthographic projection of a plurality of second grooves on the second face (112) satisfies the relationship: 20% S3≤S4≤40% S3.
6. The tab of claim 3, wherein: At least one end of at least part of the first groove and / or at least one end of at least part of the second groove extends to the edge of the tab body and communicates with the edge of the tab body.
7. The tab of claim 3, wherein: The orthographic projection shape of each first groove on the first face (111) along the thickness direction (a) of the tab body is point-like, line-like or geometric pattern. And / or, the orthographic projection shape of each second groove on the second face (112) is point-like, line-like or geometric pattern.
8. The tab of claim 7, wherein: The orthographic projection shapes of a plurality of first grooves are the same or different. And / or, the orthographic projection shapes of a plurality of second grooves are the same or different. And / or, the orthographic projection shape of the first groove is the same as or different from the orthographic projection shape of the second groove.
9. An electric cell characterized by: The tab body includes a first face (111) and a second face (112) oppositely arranged along a thickness direction (a) of the tab body, the first face (111) is provided with a first groove area (113) recessed along the first face (111) towards the second face (112), and / or the second face (112) is provided with a second groove area (114) recessed along the second face (112) towards the first face (111).
10. A battery, characterized by: The battery cell of claim 9 is arranged in a housing (20) having a receiving cavity, and a cover plate assembly (30) is arranged on an opening of the housing (20), wherein the cover plate assembly (30) comprises a first cover plate (31), a second cover plate (32), and an insulating seal (33), the first cover plate (31) is arranged around a periphery of the second cover plate (32), an edge of the first cover plate (31) is connected to the housing (20), and the insulating seal (33) is arranged between the first cover plate (31) and the second cover plate (32), the first tab (1311) is electrically connected to a bottom wall of the housing (20), and the second tab (1411) is electrically connected to the second cover plate (32).