High-stability battery cell

Abstract

The utility model belongs to the technical field of battery cell manufacturing and processing, and particularly relates to a high-stability battery cell, which comprises a battery cell body, a tab is led out from one side of the battery cell body, the tab and the battery cell body are integrally formed, a division groove is arranged on the tab, the tab is divided into a plurality of connection tabs through the division groove, and the connection tabs are connected with the battery cell body through the division groove. According to the present invention, the tab is divided into the plurality of connection tabs, and the connection tabs are arranged on the tabs, such that the tab is divided into the plurality of connection tabs, and the connection tabs are arranged on the tabs so as to effectively solve the problem of the increase of the tab fracture risk, and improve the stability and the safety of the battery cell.

Description

Technical Field

[0001] This utility model belongs to the field of battery cell manufacturing technology, and in particular relates to a high-stability battery cell. Background Technology

[0002] During battery cell manufacturing, the foil thickness gradually decreases, significantly increasing the risk of foil tab breakage. When a tear occurs in the foil, the entire foil tab may rupture completely, leading to abnormal capacity retention and even safety risks. To address this issue, a split tab design is employed. If one tab is defective or broken, the breakage will not further affect the other tab, ensuring the electrode can function normally and guaranteeing the battery cell's capacity and safety performance. Furthermore, both the positive and negative tabs are separated into two connecting tabs by dividing grooves, further improving the battery cell's stability and safety. Utility Model Content

[0003] The purpose of this utility model is to: based on their own practice and combined with actual usage, the inventor designed a highly stable battery cell to address the shortcomings of existing technologies and solve the technical problem that the risk of electrode breakage increases due to the gradual thinning of the electrode foil material in existing technologies.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A high-stability battery cell includes a battery cell body, with a tab extending from one side of the battery cell body. The tab is integrally formed with the battery cell body. A dividing groove is provided on the tab, and the tab is divided into multiple connecting tabs through the dividing groove. An adapter piece is provided on the tab, and the adapter piece is fixedly connected to the tab.

[0006] Furthermore, the dividing groove extends through the tab along the thickness direction of the cell body.

[0007] Furthermore, the electrode tab includes a positive electrode tab and a negative electrode tab, and the dividing groove is provided on both the positive electrode tab and the negative electrode tab.

[0008] Furthermore, the dividing groove is formed in one step with the electrode sheet by laser cutting;

[0009] Alternatively, the dividing groove can be formed in one step with the electrode sheet by stamping and cutting.

[0010] Furthermore, the end of the dividing groove near the battery cell body is provided with a rounded corner.

[0011] Furthermore, the end of the dividing groove away from the cell body extends through the entire tab along the length of the cell body.

[0012] Furthermore, the width of the dividing groove is 1-3 mm.

[0013] Furthermore, one side of the adapter plate is fixedly connected to the electrode tab by laser welding.

[0014] Furthermore, the multiple connecting tabs are arranged on the same horizontal line.

[0015] Alternatively, multiple connecting tabs may be arranged alternately at different heights.

[0016] Furthermore, the two connecting tabs are connected to the same side of the adapter plate;

[0017] Alternatively, the two connecting tabs are respectively connected to the two opposite surfaces of the adapter piece.

[0018] The beneficial effect of this utility model is that it provides a high-stability battery cell, which effectively solves the problem of increased risk of electrode breakage by dividing the electrode into two connecting electrodes and setting an adapter plate on the electrode, thereby improving the stability and safety of the battery cell. Attached Figure Description

[0019] The following will refer to the appendix. Figures 1-5 This section describes the features, advantages, and technical effects of exemplary embodiments of the present invention.

[0020] Figure 1 This is a schematic diagram of the overall structure of the high-stability battery cell of this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the battery cell body in this utility model;

[0022] Figure 3 for Figure 2 A magnified view of part A;

[0023] Figure 4 This is a schematic diagram of the top structure of the high-stability battery cell of this utility model;

[0024] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of this utility model.

[0025] In the diagram: 1. Battery cell body; 2. Electrode tab; 3. Dividing groove; 4. Adapter piece; 5. Contact part;

[0026] 21. Connecting tab; 22. Positive tab; 23. Negative tab;

[0027] 32. Rounded corners. Detailed Implementation

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0029] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0030] The following is in conjunction with the appendix Figures 1-5 The present invention will be described in further detail, but this is not intended to limit the scope of the present invention.

[0031] Example 1

[0032] This embodiment discloses a high-stability battery cell, including a battery cell body 1, with a tab 2 extending from one side of the battery cell body 1. The tab 2 is integrally formed with the battery cell body 1. A dividing groove 3 is provided on the tab 2, which is divided into two connecting tabs 21 of the same size through the dividing groove 3. An adapter piece 4 is provided on the tab 2, and the adapter piece 4 is fixedly connected to the tab 2.

[0033] Specifically, the dividing groove 3 can be formed in one step with the electrode sheet by laser cutting or stamping. The width of the dividing groove 3 is 1-3 mm, and one end near the cell body 1 can be provided with a rounded corner 32, while the other end can extend to the outside of the tab 2. One side of the adapter piece 4 is fixedly connected to the tab 2 by laser welding. The two connecting tabs 21 can be connected to the same side of the adapter piece 4, or to the two opposite surfaces of the adapter piece 4 respectively.

[0034] Therefore, this technical solution designs the tab 2 as a single piece and sets a dividing groove 3 on the tab 2, dividing the tab 2 into two connecting tabs 21. This design can prevent the breakage of the connecting tab 21 from extending to the other connecting tab 21 when it breaks, thus ensuring the capacity and safety performance of the cell. The adapter piece 4 further enhances the stability of the tab 2, ensuring the reliability of the cell under extreme conditions. When the battery is working, even if one connecting tab 21 breaks, since the two connecting tabs 21 are the same size, the other connecting tab 21 will still be connected to the adapter piece 4, thus preventing the breakage of one connecting tab 21 from affecting the capacity and safety performance of the cell. Usually, the tab 2 is a soft structure with insufficient structural strength, while the adapter piece 4 is a rigid structure. The adapter piece 4 is welded to the tab 2, which can improve the consistency of the tab 2, prevent the tab 2 from breaking, and improve the structural strength of the tab 2.

[0035] This technical solution effectively solves the technical problem of increased risk of breakage of the battery cell tab 2 when the foil becomes thinner. Through the design of the dividing groove 3 and the adapter plate 4, the stability and safety of the battery cell are significantly improved.

[0036] In this embodiment, the dividing groove 3 penetrates the tab 2 along the thickness direction of the cell body 1.

[0037] The dividing groove 3 extends through the tab 2 along the thickness direction of the cell body 1. This technical feature ensures that the tab 2 is completely divided in the thickness direction of the cell body 1, thus solving the problem of incomplete division of the tab 2 in the thickness direction. In this way, the tab 2 is divided into two connecting tabs 21 of the same size, further improving the stability and safety of the cell.

[0038] In this embodiment, the electrode 2 includes a positive electrode 22 and a negative electrode 23, and both the positive electrode 22 and the negative electrode 23 are provided with a dividing groove 3.

[0039] Specifically, in this application, the positive tab 22 and the negative tab 23 are both divided into two connecting tabs 21 by the dividing groove 3. Even if one of the connecting tabs 21 breaks, it will not affect the positive tab 22 and the negative tab 23, thereby ensuring the stability and safety of the battery cell.

[0040] In this embodiment, the dividing groove 3 is formed in one step with the electrode sheet by laser cutting.

[0041] Specifically, laser cutting can use continuous wave lasers or pulsed lasers. The laser power and cutting speed are adjusted according to the material and thickness of the electrode to ensure cutting accuracy and efficiency.

[0042] Furthermore, during the laser cutting process, a real-time monitoring and feedback system can be used to further optimize the cutting path and parameters, reducing errors and material waste.

[0043] In response, the dividing groove 3 is formed in one step with the electrode sheet by laser cutting, which can effectively improve production efficiency and precision.

[0044] Laser cutting technology features high precision and high speed, enabling the rapid formation of the required dividing grooves on the electrode sheet, reducing errors and time consumption during the production process.

[0045] In this way, the accuracy and consistency of the dividing groove 3 can be ensured, while solving the problems of insufficient accuracy and low production efficiency that may occur in traditional cutting methods.

[0046] Therefore, the application of laser cutting technology not only improves the quality of the electrode dividing groove 3, but also significantly improves the efficiency and reliability of the overall production process.

[0047] In this embodiment, the dividing groove 3 is formed in one step with the electrode sheet by stamping and cutting.

[0048] Specifically, stamping and slitting is a process of cutting materials using a mold. The mold design can be customized according to the size and shape of the dividing groove 3 to ensure the cutting accuracy.

[0049] Specifically, stamping and cutting can complete the forming of the dividing groove 3 on the electrode sheet in one go through the cooperation of the upper and lower dies, avoiding the errors caused by multiple processing.

[0050] As a preferred embodiment, stamping and slitting can be carried out using high-speed stamping equipment to improve processing efficiency while ensuring the flatness and dimensional accuracy of the cut surface.

[0051] In response, stamping and slitting technology can achieve fast and precise cutting, reduce errors in the processing, and thus improve the processing efficiency and accuracy of the slitting groove 3.

[0052] In this embodiment, the end of the dividing groove 3 near the cell body 1 is provided with a rounded corner 32.

[0053] Specifically, the design of the rounded corner 32 can be achieved in a variety of ways, such as by using machining, laser cutting or stamping to form a smooth transition at the edge of the dividing groove 3.

[0054] Specifically, the radius of the fillet 32 ​​can be optimized based on the thickness and material properties of the tab 2 to ensure a more uniform stress distribution.

[0055] As a preferred embodiment, the radius of the fillet 32 ​​can be set to 0.1 to 0.5 mm to effectively reduce stress concentration while ensuring structural strength.

[0056] By setting a rounded corner 32 at one end of the dividing groove 3 near the cell body 1, stress concentration at this location can be effectively reduced, thereby lowering the risk of tab 2 breaking at this point. The rounded corner 32 design makes the edge of the dividing groove 3 smoother, avoiding stress concentration caused by sharp edges and improving the stability and durability of tab 2. As a result, tab 2 can better withstand mechanical and thermal stress during long-term use, extending the lifespan of the cell.

[0057] In this embodiment, the other end of the dividing groove 3 extends to the outside of the tab 2.

[0058] Specifically, the other end of the dividing groove 3 extends to the outside of the tab 2, a design that enhances the structural stability of the tab 2.

[0059] By extending the dividing groove 3 to the outside of the tab 2, the stress on the tab 2 during charging and discharging can be effectively dispersed, reducing the risk of breakage of the tab 2 due to stress concentration.

[0060] In addition, this design can also improve the mechanical strength of the tab 2, ensuring that the battery cell maintains stable performance during long-term use.

[0061] In this embodiment, the width of the dividing groove 3 is 1-3 mm.

[0062] Specifically, the width of the dividing groove 3 is set to 1 mm, 1.5 mm, 2 mm, 2.5 mm, and 3 mm. This range effectively balances the structural stability and processing difficulty of the tab 2. Specifically, the width of the dividing groove 3 can be achieved through laser cutting, stamping, or other methods, and can be adjusted according to actual processing conditions and the material properties of the tab 2. For example, in scenarios requiring high processing precision, the width of the dividing groove 3 can be set to 1.5-2.5 mm to further reduce processing difficulty; while in scenarios requiring high strength of the tab 2, the width of the dividing groove 3 can be set to 2-3 mm to enhance the structural stability of the tab 2.

[0063] The width of the dividing groove 3 is controlled within 1-3 mm, which ensures the mechanical strength of the tab 2 while reducing the processing difficulty. If the dividing groove 3 is too narrow, it may lead to excessively high processing precision requirements, increasing production costs; if the dividing groove 3 is too wide, it may affect the structural strength of the tab 2, making it prone to breakage under stress. By controlling the width of the dividing groove 3 within 1-3 mm, the increased processing difficulty caused by the narrow width of the tab 2 during processing is avoided, as is the decreased structural strength of the tab 2 caused by the wide width, thereby improving the overall stability and reliability of the battery cell.

[0064] In this embodiment, one side of the adapter piece 4 is fixedly connected to the tab 2 by laser welding.

[0065] Laser welding, as a high-precision connection method, ensures a strong connection between the adapter plate 4 and the tab 2. Specifically, laser welding uses a high-energy-density laser beam to locally heat the contact surfaces of the adapter plate 4 and the tab 2, rapidly melting them to form a strong weld joint. This welding method has advantages such as high welding speed, small heat-affected zone, and high weld strength, effectively preventing loosening or breakage at the connection point. Furthermore, laser welding parameters, such as laser power and welding speed, can be adjusted according to actual needs to adapt to the welding requirements of adapter plates 4 and tabs 2 with different materials and thicknesses.

[0066] Specifically, the implementation of laser welding may include the following steps: First, the contact surfaces of the adapter plate 4 and the electrode 2 are cleaned to ensure welding quality; second, the adapter plate 4 and the electrode 2 are aligned and fixed so that their contact surfaces fit tightly; next, the contact surfaces are welded using laser welding equipment, and the focal position of the laser beam and the welding speed are controlled during the welding process to ensure the quality of the welded joint; finally, the welded joint is inspected to ensure that it meets the design requirements.

[0067] Laser welding technology significantly improves the connection strength between the adapter plate 4 and the tab 2, thereby enhancing the stability and safety of the battery cell. Compared to traditional welding methods, laser welding offers higher precision and strength, effectively preventing loosening or breakage of the connection during long-term use and ensuring the reliability of the battery cell. Furthermore, the smaller heat-affected zone from laser welding reduces thermal damage to surrounding materials, further improving the overall performance of the battery cell.

[0068] In this embodiment, the two connecting tabs 21 are connected to the same side of the adapter plate 4.

[0069] By connecting the two connecting tabs 21 to the same side of the adapter plate 4, the force on the tab 2 can be effectively distributed, reducing the risk of breakage due to excessive force at a single point. This design not only enhances the connection stability between the tab 2 and the adapter plate 4, but also improves the overall safety performance of the battery cell.

[0070] Especially when tab 2 is defective or broken, this split design can prevent the breakage from extending to affect the other tab 2, thereby ensuring the capacity and safety performance of the battery cell.

[0071] Therefore, the technical solution of this application has significant advantages in solving the technical problem of unstable or broken tab 2 connection.

[0072] Example 2

[0073] In this embodiment, unlike in embodiment one, the two connecting tabs 21 are respectively connected to the two opposite surfaces of the adapter piece 4.

[0074] Specifically, in this embodiment, a contact portion 5 can be provided at the end where the tab 2 is connected to the adapter piece 4. The width of the contact portion 5 is the same as the width of the adapter piece 4, thereby increasing the contact area between the tab 2 and the adapter piece 4, thereby improving the current flow rate and connection stability.

[0075] It should be noted that the contact portions 5 on the two connecting tabs 21 are arranged opposite each other, and the two contact portions 5 overlap when viewed from the top view.

[0076] The other structures are the same as in Embodiment 1, and will not be described in detail in this embodiment.

[0077] 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 regard 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.

[0078] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments described above, and any obvious improvements, substitutions, or modifications made by those skilled in the art based on this utility model are within the protection scope of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A high-stability battery cell, characterized in that: The device includes a battery cell body, with a tab extending from one side of the battery cell body. The tab is integrally formed with the battery cell body. The tab is provided with a dividing groove, which divides the tab into multiple connecting tabs. An adapter piece is provided on the tab, and the adapter piece is fixedly connected to the tab.

2. The high-stability battery cell according to claim 1, characterized in that: The dividing groove extends through the tab along the thickness direction of the cell body.

3. The high-stability battery cell according to claim 1, characterized in that: The electrode includes a positive electrode and a negative electrode, and the dividing groove is provided on both the positive electrode and the negative electrode.

4. The high-stability battery cell according to claim 1, characterized in that: The dividing groove is formed in one step with the electrode sheet by laser cutting; Alternatively, the dividing groove can be formed in one step with the electrode sheet by stamping and cutting.

5. The high-stability battery cell according to claim 1, characterized in that: The end of the dividing groove near the cell body has a rounded corner.

6. The high-stability battery cell according to claim 1, characterized in that: The end of the dividing groove away from the cell body extends through the entire tab along the length of the cell body.

7. The high-stability battery cell according to claim 1, characterized in that: The width of the dividing groove is 1-3 mm.

8. The high-stability battery cell according to claim 1, characterized in that: One side of the adapter plate is fixedly connected to the electrode tab by laser welding.

9. The high-stability battery cell according to claim 1, characterized in that: Multiple connecting tabs are arranged on the same horizontal line. Alternatively, multiple connecting tabs may be arranged alternately at different heights.

10. The high-stability battery cell according to claim 1, characterized in that: The two connecting tabs are connected to the same side of the adapter plate; Alternatively, the two connecting tabs are respectively connected to the two opposite surfaces of the adapter piece.

Images