A two-side tab cell structure
Patent Information
- Application Number
- CN202522293161.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-30
- Publication Date
- 2026-10-13
- Estimated Expiration
- 2035-10-30
AI Technical Summary
[0003]基于此，本实用新型实施例提供一种两侧出极耳电芯结构，旨在解决现有电芯结构的两侧极耳均需预留超声焊接位置、电芯内部的空间利用率和体积能量密度低、或者极耳与盖板连接需要添加连接片、电芯成本高、欧姆电阻大以及生产效率低等问题
[0016]与现有技术相比，本实用新型所达到的有益效果：本申请结构具有较高的空间利用率，可以有效提高电池的体积能量密度。电芯极耳与盖板极耳之间的连接不需要通过连接片，不需要额外添加连接片，不增加电芯生产工序，不额外增加连接片成本，不影响生产效率，降低了电芯的生产成本，而且电芯极耳与盖板极耳直接焊接连接，无需增加连接片的焊接节点，电芯的欧姆电阻小。本申请结构简单，易于实现，成本较低，稳定性较好，能够很好的满足实际使用的需要。
Smart Images
Figure CN224851842U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a battery cell structure with tabs on both sides. Background Technology
[0002] Currently, existing CTB lithium-ion batteries generally adopt a cell structure with tabs on both the positive and negative electrodes. This structure results in uniform current distribution and low heat generation during charging and discharging, leading to good rate performance and cycle life. However, this cell structure requires ultrasonic welding positions on both sides of the tabs, resulting in low internal space utilization and a lower volumetric energy density. The industry commonly improves energy density by adding connecting tabs to weld the tabs to the cover plate and then bending the tabs and connecting tabs. However, this method requires adding connecting tabs between the tabs and the cover plate, increasing cell cost. Furthermore, adding connecting tabs increases the number of welding points on the cell tabs, increasing the ohmic resistance and reducing battery production efficiency. Utility Model Content
[0003] Based on this, the present invention provides a battery cell structure with tabs on both sides, which aims to solve the problems of existing battery cell structures, such as the need to reserve ultrasonic welding positions on both sides of the tabs, low space utilization and volumetric energy density inside the battery cell, or the need to add connecting pieces to connect the tabs to the cover plate, high battery cell cost, high ohmic resistance, and low production efficiency.
[0004] To achieve the above objectives, the present invention proposes the following technical solution: a battery cell structure with tabs on both sides, comprising a battery cell body, wherein the battery cell body comprises several diaphragms, several irregularly shaped electrode sheets and several first electrode sheets stacked together, the irregularly shaped electrode sheets and the first electrode sheets are alternately arranged, and the diaphragms are provided between the irregularly shaped electrode sheets and the first electrode sheets and on both sides of the battery cell body;
[0005] The irregularly shaped electrode includes an electrode dressing area and an irregularly shaped electrode tab. The electrode dressing area is disposed in contact with the diaphragm. The irregularly shaped electrode tab includes a first electrode tab portion and a second electrode tab portion. The first electrode tab portion is connected to the electrode dressing area and the second electrode tab portion respectively. The second electrode tab portion protrudes from the edge of the electrode dressing area.
[0006] In a preferred embodiment, the first electrode portion and the second electrode portion are integrally formed and are arranged in an L-shape.
[0007] In a preferred embodiment, the first electrode tab extends horizontally outward from the edge of the electrode dressing area; the first electrode tab is perpendicular to the second electrode tab, and the first electrode tab is parallel to the electrode dressing area.
[0008] In a preferred embodiment, the first electrode includes an integrally formed electrode body and a third electrode tab, wherein the third electrode tab extends horizontally outward from the edge of the electrode body.
[0009] In a preferred embodiment, when the irregularly shaped electrode sheet is stacked with the first electrode sheet, the first electrode tab is disposed on one side of the battery cell body, and the third electrode tab is disposed on the other side of the battery cell body.
[0010] In a preferred embodiment, after the irregularly shaped electrode sheet is stacked with the first electrode sheet to form the battery cell body, the outer side of the third electrode ear is bent toward the direction close to the battery cell body; the outer side of the bent third electrode ear is arranged parallel to the side of the battery cell body.
[0011] In a preferred embodiment, after the irregularly shaped electrode sheet and the first electrode sheet are stacked to form the battery cell body, the outer side of the first electrode tab is bent toward the direction close to the battery cell body; the outer side of the bent first electrode tab is parallel to the side of the battery cell body; the second electrode tab is bent toward the outer side of the first electrode tab until the outer side of the second electrode tab is perpendicular to the outer side of the first electrode tab.
[0012] In a preferred embodiment, the battery cell structure with tabs on both sides further includes a cover plate, one end of which is provided with a first cover plate tab and the other end with a second cover plate tab; when the cover plate is disposed on the top of the battery cell body, the first cover plate tab is welded to the outer side of the bent third tab portion; the second cover plate tab is welded to the second tab portion to form a welded part.
[0013] In a preferred embodiment, the welding portion is bent toward the direction of the battery cell body, and the bent welding portion is arranged parallel to the side of the battery cell body.
[0014] In a preferred embodiment, the irregularly shaped electrode is a negative electrode, the first electrode is a positive electrode, the first cover plate tab is a positive electrode tab, and the second cover plate tab is a negative electrode tab; or the irregularly shaped electrode is a positive electrode, the first electrode is a negative electrode, the first cover plate tab is a negative electrode tab, and the second cover plate tab is a positive electrode tab.
[0015] In a preferred embodiment, the battery cell body is a lithium-ion battery cell body or a sodium-ion battery cell body.
[0016] Compared with existing technologies, the beneficial effects achieved by this utility model are as follows: The structure of this application has a high space utilization rate, which can effectively improve the volumetric energy density of the battery. The connection between the cell tab and the cover plate tab does not require a connecting piece, eliminating the need for additional connecting pieces, reducing cell production steps, and minimizing the cost of connecting pieces. This does not affect production efficiency and reduces cell production costs. Furthermore, the cell tab and cover plate tab are directly welded together, eliminating the need for additional welding joints, resulting in low ohmic resistance of the cell. This application has a simple structure, is easy to implement, has low cost, and good stability, thus well meeting the needs of practical applications. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of the overall structure of a battery cell with two tabs on both sides according to an embodiment of the present invention.
[0019] Figure 2 for Figure 1 A schematic diagram of the bending structure of the first electrode and the cover plate before welding of the two-sided electrode tab battery cell structure;
[0020] Figure 3 for Figure 1 A schematic diagram of the bending structure of the irregularly shaped electrode sheet and the cover plate before welding of the two-sided electrode tab cell structure;
[0021] Figure 4 for Figure 1 A schematic diagram of the battery cell body;
[0022] Figure 5 for Figure 3 A schematic diagram of the structure of the irregularly shaped electrode sheet;
[0023] Figure 6 for Figure 3 A schematic diagram of the structure of the first electrode.
[0024] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0026] It should be noted that if any directional indication (such as up, down, left, right, front, back, top, bottom, etc.) is involved in the embodiments of this utility model, the directional indication is only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.
[0027] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0028] It should be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component.
[0029] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0030] Specifically, such as Figures 1 to 6As shown, the present invention proposes the following technical solution: a battery cell structure with tabs on both sides, including a battery cell body 10, wherein the battery cell body 10 includes several diaphragms 11, several irregularly shaped electrode sheets 12 and several first electrode sheets 13 stacked together, the irregularly shaped electrode sheets 12 and the first electrode sheets 13 are alternately arranged, and the diaphragms 11 are provided between the irregularly shaped electrode sheets 12 and the first electrode sheets 13 and on both sides of the battery cell body 10;
[0031] The irregularly shaped electrode 12 includes an electrode dressing area 121 and an irregularly shaped electrode tab 122. The electrode dressing area 121 is disposed in contact with the diaphragm 11. The irregularly shaped electrode tab 122 includes a first electrode tab portion 1221 and a second electrode tab portion 1222. The first electrode tab portion 1221 is connected to the electrode dressing area 121 and the second electrode tab portion 1222 respectively. The second electrode tab portion 1222 protrudes from the edge of the electrode dressing area 121.
[0032] By using irregularly shaped electrode sheets, and designating the irregularly shaped tabs as the first and second tabs, the space utilization of the battery cell can be improved, effectively increasing the volumetric energy density of the battery. Simultaneously, the connection between the cell tabs and the cover plate tabs does not require connecting tabs, eliminating the need for additional connecting tabs, reducing cell production steps and costs, and not affecting production efficiency, thus lowering the overall production cost of the battery cell.
[0033] In a preferred embodiment, the first electrode tab 1221 and the second electrode tab 1222 are integrally formed and are arranged in an L-shape. This allows the first electrode tab and the second electrode tab to be staggered, which not only facilitates space utilization but also makes it easier to connect the cell electrode tab and the cover plate electrode tab.
[0034] In a preferred embodiment, the first electrode tab 1221 extends horizontally outward from the edge of the electrode dressing area 121; the first electrode tab 1221 and the second electrode tab 1222 are arranged perpendicularly, and the first electrode tab 1221 is arranged parallel to the electrode dressing area 121.
[0035] In a preferred embodiment, the first electrode 13 includes an integrally formed electrode body 131 and a third electrode tab 132, the third electrode tab 132 extending horizontally outward from the edge of the electrode body 131. The electrode body 131 abuts against the diaphragm 11.
[0036] In a preferred embodiment, when the irregularly shaped electrode 12 and the first electrode 13 are stacked together, the first electrode tab 1221 is disposed on one side of the cell body 10, and the third electrode tab 132 is disposed on the other side of the cell body 10.
[0037] In a preferred embodiment, after the irregularly shaped electrode 12 and the first electrode 13 are stacked to form the cell body 10, the outer side of the third electrode ear 132 is bent toward the direction close to the cell body 10; the outer side of the bent third electrode ear 132 is arranged parallel to the side of the cell body 10.
[0038] In a preferred embodiment, after the irregularly shaped electrode 12 and the first electrode 13 are stacked to form the cell body 10, the outer side of the first electrode tab 1221 is bent toward the direction close to the cell body 10; the outer side of the bent first electrode tab 1221 is parallel to the side of the cell body 10; the second electrode tab 1222 is bent toward the outer side of the first electrode tab 1221 until the second electrode tab 1222 is perpendicular to the outer side of the first electrode tab 1221.
[0039] In a preferred embodiment, the battery cell structure with tabs on both sides further includes a cover plate 20. One end of the cover plate 20 is provided with a first cover plate tab 21, and the other end is provided with a second cover plate tab 22. When the cover plate 20 is disposed on the top of the battery cell body 10, the first cover plate tab 21 is welded to the outer side of the bent third tab portion 132. The second cover plate tab 22 is welded to the second tab portion 1222 to form a welded portion 30.
[0040] In a preferred embodiment, the welding portion 30 is bent toward the direction of the cell body 10, and the bent welding portion 30 is arranged parallel to the side of the cell body 10.
[0041] In a preferred embodiment, the irregularly shaped electrode 12 is a negative electrode, the first electrode 13 is a positive electrode, the first cover plate tab 21 is a positive tab, and the second cover plate tab 22 is a negative tab; or the irregularly shaped electrode 12 is a positive electrode, the first electrode 13 is a negative electrode, the first cover plate tab 21 is a negative tab, and the second cover plate tab 22 is a positive tab.
[0042] In a preferred embodiment, the cell body 10 is a lithium-ion cell body or a sodium-ion cell body. The cell body 10 can be configured according to actual needs and can be either a lithium-ion cell body or a sodium-ion cell body.
[0043] This application's structure boasts high space utilization, effectively improving the volumetric energy density of the battery. The connection between the cell tab and the cover tab eliminates the need for connecting tabs, thus avoiding additional cell manufacturing processes, connecting tab costs, and impacting production efficiency, thereby reducing cell production costs. Furthermore, the direct welding connection between the cell tab and the cover tab eliminates the need for additional welding points, resulting in low ohmic resistance in the cell. This application's structure is simple, easy to implement, low-cost, and exhibits good stability, effectively meeting the needs of practical applications.
[0044] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.
[0045] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
[0046] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.
Claims
1. A battery cell structure with tabs on both sides, characterized in that, The battery cell body includes several diaphragms, several irregularly shaped electrode sheets, and several first electrode sheets stacked together. The irregularly shaped electrode sheets and the first electrode sheets are alternately arranged. The diaphragms are provided between the irregularly shaped electrode sheets and the first electrode sheets, as well as on both sides of the battery cell body. The irregularly shaped electrode includes an electrode dressing area and an irregularly shaped electrode tab. The electrode dressing area is disposed in contact with the diaphragm. The irregularly shaped electrode tab includes a first electrode tab portion and a second electrode tab portion. The first electrode tab portion is connected to the electrode dressing area and the second electrode tab portion respectively. The second electrode tab portion protrudes from the edge of the electrode dressing area.
2. The battery cell structure with two tabs on both sides according to claim 1, characterized in that, The first electrode portion and the second electrode portion are integrally formed and are arranged in an L-shape.
3. The battery cell structure with two tabs on both sides according to claim 1, characterized in that, The first electrode tab extends horizontally outward from the edge of the electrode dressing area; the first electrode tab is perpendicular to the second electrode tab, and the first electrode tab is parallel to the electrode dressing area.
4. The battery cell structure with two tabs on both sides according to claim 1, characterized in that, The first electrode includes an integrally formed electrode body and a third electrode tab, wherein the third electrode tab extends horizontally outward from the edge of the electrode body.
5. The battery cell structure with two tabs on both sides according to claim 4, characterized in that, When the irregularly shaped electrode sheet is stacked with the first electrode sheet, the first electrode tab is located on one side of the battery cell body, and the third electrode tab is located on the other side of the battery cell body.
6. The battery cell structure with two tabs on both sides according to claim 4, characterized in that, After the irregularly shaped electrode sheet is stacked with the first electrode sheet to form the battery cell body, the outer side of the third electrode ear is bent towards the direction of the battery cell body; the outer side of the bent third electrode ear is arranged parallel to the side of the battery cell body.
7. The battery cell structure with two tabs on both sides according to claim 1, characterized in that, After the irregularly shaped electrode sheet and the first electrode sheet are stacked to form the battery cell body, the outer side of the first electrode tab is bent toward the direction close to the battery cell body; the outer side of the first electrode tab after bending is parallel to the side of the battery cell body; the second electrode tab is bent toward the outer side of the first electrode tab until the outer side of the second electrode tab is perpendicular to the outer side of the first electrode tab.
8. The battery cell structure with two tabs on both sides according to claim 6, characterized in that, The battery cell structure with tabs on both sides also includes a cover plate. One end of the cover plate is provided with a first cover plate tab, and the other end is provided with a second cover plate tab. When the cover plate is provided on the top of the battery cell body, the first cover plate tab is welded to the outer side of the bent third tab. The second cover plate tab is welded to the second tab to form a welded part.
9. The battery cell structure with two tabs on both sides according to claim 8, characterized in that, The welded portion is bent toward the direction of the cell body, and the bent welded portion is arranged parallel to the side of the cell body.
10. The battery cell structure with two tabs on both sides according to claim 8, characterized in that, The irregularly shaped electrode is a negative electrode, the first electrode is a positive electrode, the first cover plate tab is a positive tab, and the second cover plate tab is a negative electrode; or the irregularly shaped electrode is a positive electrode, the first electrode is a negative electrode, the first cover plate tab is a negative tab, and the second cover plate tab is a positive tab; the battery cell body is a lithium-ion battery cell body or a sodium-ion battery cell body.