A thick electrode cell with multiple tabs in parallel

Abstract

This utility model relates to the field of battery technology and discloses a multi-tab parallel thick electrode cell, including a tab body: the tab body consists of two internal metal conductive segments and a flexible connecting part disposed between the opposing surfaces of the two metal conductive segments. This multi-tab parallel thick electrode cell, by using a structure where the tab body consists of two metal conductive segments and a flexible connecting part, with the flexible connecting part made of polyimide and the metal conductive segments made of copper-plated nickel, achieves the foldable or bendable function of the tabs. Polyimide has excellent flexibility and high-temperature resistance, ensuring that the tabs are not easily broken when bent. Meanwhile, the copper-plated nickel material provides both good conductivity and corrosion resistance, meeting the conductivity requirements of the cell and solving the problems of difficult bending and easy rebound of traditional rigid tabs. This improves the ease of operation during cell packaging and reduces the risk of short circuits caused by the rigidity of the tabs.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a thick electrode cell with multiple tabs connected in parallel. Background Technology

[0002] Battery technology refers to a wide range of technical fields involving the design, manufacturing, application and research of batteries. It covers multiple aspects from basic materials science to complex system integration, aiming to develop and optimize various types of batteries to meet different energy storage and conversion needs. In the field of battery technology, thick electrode cells with multiple tabs connected in parallel can reduce internal resistance and improve charging and discharging efficiency through the shunt effect of the multiple tabs.

[0003] Regarding existing related technologies, the inventors believe that the following defects often exist: Existing multi-tab parallel thick electrode cells usually have insufficient tab flexibility. The tabs made of rigid metal materials are prone to breakage when folded or bent, and they are prone to rebound after bending, which makes it difficult to operate when the cell is packaged into the shell. Problems such as tab misalignment and poor edge distance are very likely to occur, and it may even scratch the insulation layer and contact the shell, causing a short circuit risk. Utility Model Content

[0004] The technical problem to be solved by this utility model is that the existing thick electrode cells with multiple tabs in parallel often have the disadvantage of being prone to breakage when folded or bent due to insufficient flexibility of the tabs. Therefore, we propose a thick electrode cell with multiple tabs in parallel.

[0005] To achieve the above objectives, this application adopts the following technical solution: a thick electrode cell with multiple tabs in parallel, comprising a tab body: the tab body consists of two internal metal conductive segments and a flexible connecting part disposed between the opposite surfaces of the two metal conductive segments, the metal conductive segments are fixedly connected to the flexible connecting part, the flexible connecting part is made of polyimide material, and the metal conductive segments are made of copper plated with nickel.

[0006] Preferably, a first metal layer is fixedly connected inside the metal conductive segment, and a second metal layer is fixedly connected to one side of the first metal layer. The first metal layer is a copper layer, and the second metal layer is a nickel layer.

[0007] Preferably, the width of the flexible connection portion is the same as the width of the metal conductive segment.

[0008] Preferably, the outer surface of the electrode body is covered with an insulating layer, and a conductive window is provided on the top of the electrode body to expose the connection end face of the metal conductive segment.

[0009] Preferably, the metal conductive segment is provided with a folding limiting structure, the folding limiting structure includes a protrusion fixedly connected to one side of the metal conductive segment and a connecting block fixedly connected to the corresponding position of an adjacent metal conductive segment, an insert block is slidably connected inside the protrusion, a pull plate is fixed to one side of the insert block, a spring is fixed to the top of the insert block, the other end of the spring is fixed to the protrusion, and a connecting groove for cooperating with the insert block is opened inside the connecting block.

[0010] Preferably, both sides of the protrusion are fixed with limiting blocks, and both sides of the insert are provided with limiting grooves that cooperate with the limiting blocks.

[0011] Preferably, a reinforcing block is provided at the end of the metal conductive segment away from the flexible connection portion.

[0012] The technical effects and advantages of this utility model are as follows:

[0013] In this invention, the tab body is composed of two metal conductive segments and a flexible connecting part. The flexible connecting part is made of polyimide material and the metal conductive segments are made of copper-plated nickel material. This enables the tab to be foldable or bendable. Polyimide has excellent flexibility and high temperature resistance, which can ensure that the tab is not easily broken when bent. At the same time, the copper-plated nickel material has good conductivity and corrosion resistance. This not only meets the conductivity requirements of the battery cell, but also solves the problems of difficult bending and easy rebound of traditional rigid tabs. This improves the convenience of operation during battery cell packaging and reduces the risk of short circuit caused by the rigidity of the tab. Attached Figure Description

[0014] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts:

[0015] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the metal conductive segment and the flexible connection part of this utility model;

[0017] Figure 3 This is a schematic diagram of the folding limiting structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the metal conductive segment structure of this utility model.

[0019] Legend: 1. Electrode body; 2. Metal conductive section; 3. Flexible connection part; 4. First metal layer; 5. Second metal layer; 6. Conductive window; 7. Protrusion; 8. Connecting block; 9. Insertion block; 10. Pull plate; 11. Spring; 12. Limiting block; 13. Limiting groove; 14. Connecting groove; 15. Reinforcing block. Detailed Implementation

[0020] Based on the technical solution of this utility model, without changing the essential spirit of this utility model, those skilled in the art can propose various interchangeable structural methods and implementation methods. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model, and should not be regarded as the entirety of this utility model or as a limitation or restriction of the technical solution of this utility model.

[0021] Reference Figures 1-4 As shown, this utility model provides a technical solution: a multi-tab parallel thick electrode cell, including a tab body 1: the tab body 1 is composed of two internal metal conductive segments 2 and a flexible connecting part 3 disposed between the opposite surfaces of the two metal conductive segments 2. The metal conductive segments 2 are fixedly connected to the flexible connecting part 3. The flexible connecting part 3 is made of polyimide material. The metal conductive segments 2 are made of copper plated with nickel. A first metal layer 4 is fixedly connected inside the metal conductive segments 2. A second metal layer 5 is fixedly connected to one side of the first metal layer 4. The first metal layer 4 is a copper layer. The second metal layer 5 is a nickel layer. The width of the flexible connecting part 3 is the same as the width of the metal conductive segments 2. The outer surface of the tab body 1 is wrapped with an insulating layer. A conductive window 6 is opened on the top of the tab body 1. The conductive window 6 is used to expose the connection end face of the metal conductive segments 2.

[0022] Specifically: A stable electrode structure is formed by the fixed connection of two metal conductive segments 2 and the flexible connection part 3, which can effectively conduct current. At the same time, the metal conductive segments 2 are made of copper-plated nickel material, and the interior is composed of a first metal layer 4 and a second metal layer 5 through an electroplating process. The first metal layer 4 ensures high conductivity to reduce current transmission loss, and the second metal layer 5 improves corrosion resistance to avoid the decrease in conductivity caused by oxidation or chemical corrosion during charging and discharging, thus extending the service life of the electrode. The flexible connection part 3 is made of polyimide material, whose excellent flexibility allows the electrode to be flexibly folded or bent, solving the problem of traditional rigid electrode being difficult to bend and easy to rebound. Moreover, the width is consistent with the metal conductive segments 2, ensuring uniform stress distribution during bending and reducing the risk of local breakage. The outer surface of the body electrode 1 is wrapped with a polytetrafluoroethylene insulating layer, which can not only isolate the electrode from the battery cell shell and other components to prevent short circuits, but also precisely expose the connection end face of the metal conductive segments 2 through the conductive window 6 at the top, ensuring a reliable conductive connection with the external circuit, improving safety without affecting conductivity.

[0023] Reference Figure 3 As shown in this embodiment: a folding limiting structure is provided on the metal conductive segment 2. The folding limiting structure includes a protrusion 7 fixedly connected to one side of the metal conductive segment 2 and a connecting block 8 fixedly connected to the corresponding position of the adjacent metal conductive segment 2. An insert 9 is slidably connected inside the protrusion 7. A pull plate 10 is fixed to one side of the insert 9. A spring 11 is fixed to the top of the insert 9. The other end of the spring 11 is fixed to the protrusion 7. A connecting groove 14 that cooperates with the insert 9 is opened inside the connecting block 8. Limiting blocks 12 are fixed on both sides inside the protrusion 7. Limiting grooves 13 that cooperate with the limiting blocks 12 are opened on both sides of the insert 9.

[0024] Specifically: by pulling the pull plate 10, the insert block 9 inside the protrusion 7 is moved. Then, under the elastic force of the spring 11, it can be inserted into the connecting groove 14 of the connecting block 8, so as to achieve a stable fixation of the tab body 1 after folding. This avoids the problem of the traditional tab body 1 rebounding on its own after folding due to lack of positioning, significantly improving the convenience of operation during cell packaging and reducing the probability of tab misalignment and poor edge distance during the casing process. The limiting blocks 12 on both sides inside the protrusion 7 cooperate with the limiting groove 13 of the insert block 9 to provide a guiding effect on the sliding direction of the insert block 9, preventing the limiting failure caused by the offset of the insert block 9 and ensuring the stability and reliability of the folded state.

[0025] Reference Figure 1 As shown in this embodiment, a reinforcing block 15 is provided at the end of the metal conductive segment 2 away from the flexible connection part 3.

[0026] Specifically: By setting up the reinforcing block 15, the connection part is a current concentration area during the charging and discharging process of the battery cell. Frequent plugging and unplugging or long-term stress can easily lead to wear or breakage. The reinforcing block 15 can improve the fatigue resistance and wear resistance of this part, reduce the risk of connection failure. The reinforcing block 15 is integrally formed with the metal conductive section 2 to ensure the continuity of conductivity, avoid the problem of increased contact resistance caused by loose connection, ensure stable charging and discharging efficiency of the battery cell, and further extend the overall service life.

[0027] Working principle: The user conducts current through the tab body 1, where the metal conductive segment 2 is the core conductive component. Its inner first metal layer 4 ensures efficient current transmission, while the outer second metal layer 5 protects the tab from corrosion during charging and discharging, maintaining stable conductivity. When the tab needs to be folded, the pull plate 10 is pulled to move the insert 9 inside the protrusion 7. At this time, the spring 11 is compressed. After the tab is folded to the predetermined position, the pull plate 10 is released, and the insert 9 is reset under the elastic force of the spring 11 and snaps into the connecting groove 14 of the connecting block 8. At the same time, the limiting block 12 inside the protrusion 7 cooperates with the limiting groove 13 of the insert 9 to ensure that the insert 9 is accurately limited, so that the tab body 1 is stably kept in the folded state and avoids rebound. The flexible connecting part 3, with the flexibility of the polyimide material, provides structural support for the folding or bending of the tab. The conductive window 6 at the top of the tab body 1 exposes the connecting end face of the metal conductive segment 2, ensuring a reliable connection with the external circuit. At the same time, the reinforcing block 15 at the end of the metal conductive segment 2 enhances the structural strength of the connecting part.

[0028] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A multi-pole tab-parallel thick electrode cell comprising a tab body (1) characterized in that, The electrode body (1) consists of two internal metal conductive segments (2) and a flexible connecting part (3) disposed between the opposite surfaces of the two metal conductive segments (2). The metal conductive segments (2) are fixedly connected to the flexible connecting part (3). The flexible connecting part (3) is made of polyimide material, and the metal conductive segments (2) are made of copper plated with nickel.

2. The thick electrode cell with multiple tabs in parallel of claim 1, wherein: The metal conductive segment (2) is internally fixedly connected to a first metal layer (4), and a second metal layer (5) is fixedly connected to one side of the first metal layer (4). The first metal layer (4) is a copper layer, and the second metal layer (5) is a nickel layer.

3. The thick electrode cell with multiple tab parallel according to claim 1, wherein: The width of the flexible connection part (3) is the same as the width of the metal conductive section (2).

4. The thick electrode cell with multiple tab parallel according to claim 1, wherein: The outer surface of the electrode body (1) is covered with an insulating layer, and a conductive window (6) is provided on the top of the electrode body (1). The conductive window (6) is used to expose the connection end face of the metal conductive segment (2).

5. The thick electrode cell with multiple tabs connected in parallel according to claim 1, characterized in that: The metal conductive segment (2) is provided with a folding limiting structure. The folding limiting structure includes a protrusion (7) fixedly connected to one side of the metal conductive segment (2) and a connecting block (8) fixedly connected to the corresponding position of the adjacent metal conductive segment (2). The protrusion (7) is slidably connected to an insert (9). A pull plate (10) is fixed to one side of the insert (9). A spring (11) is fixed to the top of the insert (9). The other end of the spring (11) is fixed to the protrusion (7). The connecting block (8) is provided with a connecting groove (14) that cooperates with the insert (9).

6. The thick electrode cell with multiple tabs in parallel of claim 5, wherein: Both sides of the protrusion (7) are fixed with limit blocks (12), and both sides of the insert (9) are provided with limit grooves (13) that cooperate with the limit blocks (12).

7. The thick electrode cell with multiple tab parallel according to claim 1, wherein: A reinforcing block (15) is provided at the end of the metal conductive segment (2) away from the flexible connection part (3).

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