Square-shell battery cell cover plate with tabs and square-shell battery cell

Abstract

The utility model discloses a square-shell battery cell cover plate with tabs and a square-shell battery cell, and relates to the technical field of battery cell trial-manufacture. The cover plate specifically comprises a cover plate body which can be buckled on a stop plate of a square-shell battery cell, and the cover plate body is provided with two via holes which are in one-to-one correspondence with electrodes on the battery cell; the two pole assemblies are respectively inserted into the via holes and are in contact with the electrodes below the via holes so as to realize electrical conduction; and the insulating part is coated on the side walls of the two pole assemblies so as to limit the conduction between the two pole assemblies and the cover plate body. The utility model aims to reduce welding of square shell battery cell tabs, improve the trial-manufacture efficiency of square shell battery cells and reduce the production cost in the trial-manufacture process of the square shell battery cells.

Description

Technical Field

[0001] This utility model relates to the field of battery cell prototyping technology, and in particular to a square-shell battery cell cover plate with tabs and a square-shell battery cell. Background Technology

[0002] In recent years, with the increasing demand for high-energy-density and long-cycle-life batteries in fields such as new energy vehicles and portable electronic devices, the development of battery cells has been continuously moving towards greater efficiency and sustainability. One of the core technologies of batteries is how to reduce the internal resistance of the cell while ensuring high cell capacity, thereby improving the overall performance of the battery. Therefore, different types of battery cells have gradually become the focus of technological research in battery system development.

[0003] In battery cell development, pouch cells have become the preferred solution for many battery system R&D projects due to their advantages such as simple manufacturing process, short prototyping cycle, and low cost. Pouch cells do not require external tabs and are encapsulated using flexible materials, giving them flexibility in structural design and facilitating small-batch production and prototyping. Therefore, they are often the best choice for preliminary verification of battery system electrical performance. However, while pouch cells offer ease of manufacturing, their relatively small capacity and high internal resistance often fail to meet the requirements for prototyping large-capacity and low-resistance cells.

[0004] To achieve the goals of large cell capacity and low internal resistance, prismatic cells have gradually become an important technological approach to solve this problem. Compared with pouch cells, prismatic cells have higher capacity and lower internal resistance, making them suitable for battery systems requiring high power and large capacity. However, despite their advantages in capacity and internal resistance, prismatic cells do not have external tabs. While this design reduces external connection points and structural complexity, it often requires additional welding of external tabs during the prototyping process. This extra step not only increases the complexity of the production process but also severely impacts testing efficiency, leading to longer prototyping cycles and increased production costs.

[0005] Therefore, in the trial production of prismatic cells, how to reduce the welding of the tabs of prismatic cells, improve the trial production efficiency of prismatic cells, and reduce production costs has become an urgent technical problem to be solved. Utility Model Content

[0006] The main purpose of this utility model is to provide a square-shell battery cell cover plate with tabs and a square-shell battery cell, which aims to reduce the welding of the tabs of the square-shell battery cell during the trial production process, improve the trial production efficiency of the square-shell battery cell, and reduce the production cost.

[0007] To achieve the above objectives, this utility model proposes a square-shell battery cell cover plate with tabs, comprising:

[0008] The cover plate body can be fastened to the stop plate of the square-shell battery cell. The cover plate body is provided with two through holes that correspond one-to-one with the electrodes on the battery cell.

[0009] Two electrode assemblies are respectively inserted into the vias and contact the electrodes below the vias to achieve electrical conduction; and

[0010] An insulating element is wrapped around the sidewalls of the two pole post assemblies to restrict the conduction between the two pole post assemblies and the cover plate body.

[0011] By designing the through-holes and the terminal post assembly, an electrical connection between the prismatic cell and the cover plate body is achieved. This allows the electrodes of the prismatic cell to be led to the external circuit through the terminal post assembly, ensuring the normal operation of the battery system. The terminal post assembly reduces the welding of the prismatic cell tabs during prototyping, improving prototyping efficiency and reducing production costs. The snap-fit ​​method between the cover plate body and the stop plate simplifies the production process, reduces production costs, and improves assembly efficiency.

[0012] In one embodiment of this application, the pole assembly includes:

[0013] The pole piece can contact the electrode; and

[0014] A tab is connected to the top of the electrode post. The tab is provided with a clamping part for easy clamping by the test clip. The insulating material covers the connection between the electrode post and the tab.

[0015] Effective contact between the terminals and electrodes ensures a good electrical connection between the internal and external circuits of the battery cell, guaranteeing normal battery operation. Simultaneously, optimized clamping mechanisms allow for faster connection of the battery to the test clamp during testing, improving testing efficiency and ensuring accuracy.

[0016] In one embodiment of this application, the clamping part is a through hole that penetrates the sidewall of the electrode tab.

[0017] The clamping part features a through hole that extends through the sidewall of the electrode tab, giving it greater adaptability and flexibility. This allows for a more secure connection with various types of test fixtures, ensuring the test clamp is firmly held in place during testing and preventing test errors or equipment malfunctions due to poor contact. Furthermore, the through hole penetrating the sidewall of the electrode tab allows for flexible connection, enabling the test clamp to hold the electrode tab from any angle or direction, thus improving operational convenience and efficiency.

[0018] In one embodiment of this application, the outer wall of the through hole is covered with an insulating layer.

[0019] The outer wall of the through-hole is covered with an insulating layer, which effectively isolates the outer wall of the through-hole from external circuits or other metal components, preventing accidental contact that could lead to arcing and improving the safety of the battery system. At the same time, the insulating layer protects the tabs and other external components from corrosion or wear, extending the lifespan of the battery assembly.

[0020] In one embodiment of this application, the insulating element is a plastic sealant.

[0021] As an insulating material, the encapsulant possesses excellent electrical insulation properties, effectively preventing current from flowing through the connection between the terminals and tabs and the cover plate, thus avoiding short circuits and leakage and ensuring the safety of the battery system. Simultaneously, the encapsulant exhibits excellent heat resistance and chemical corrosion resistance, maintaining stable performance under various extreme environments, enhancing the long-term reliability and stability of the prismatic battery cell. The presence of the encapsulant also ensures the stability of the terminal assembly during operation, preventing swaying.

[0022] In one embodiment of this application, the cover plate body is provided with an explosion-proof valve aligned with the explosion-proof opening on the stop plate.

[0023] The explosion-proof valve automatically opens when the internal pressure of the battery is too high, releasing excess gas and preventing the battery casing from rupturing or exploding due to excessive internal pressure, thus significantly improving battery safety. By aligning with the explosion-proof port on the stop plate, the explosion-proof valve ensures an unobstructed gas release path, avoiding problems caused by misalignment that prevent proper pressure release and improving system reliability.

[0024] In one embodiment of this application, the cover plate body is provided with an injection hole aligned with the injection channel on the stop plate.

[0025] Aligning the injection hole with the injection channel ensures the precision and efficiency of the injection process, allowing the liquid to flow smoothly into the battery and ensuring a uniform distribution of liquid or electrolyte within the battery, thereby improving battery performance and stability.

[0026] This application also discloses a prismatic battery cell, including a prismatic battery cell cover plate with tabs as described in any of the above claims.

[0027] By employing the above technical solution and designing the connection between the through-hole and the terminal assembly, an electrical connection between the prismatic cell and the cover plate body is achieved. This allows the electrodes of the prismatic cell to be led to the external circuit through the terminal assembly, ensuring the normal operation of the battery system. The terminal assembly design reduces the welding of the prismatic cell tabs during the prototyping process, improving prototyping efficiency and reducing production costs. The snap-fit ​​method between the cover plate body and the stop plate simplifies the production process, reduces production costs, and improves assembly efficiency. Attached Figure Description

[0028] The present invention will now be described in detail with reference to specific embodiments and accompanying drawings, wherein:

[0029] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present utility model;

[0030] 10. Cover plate body; 11. Through hole; 12. Explosion-proof valve; 13. Liquid injection hole; 21. Pole post; 22. Pole lug; 221. Clamping part; 30. Insulating part; 40. Test clip; 50. Stop plate. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the following specific embodiments are only used to explain this utility model and do not constitute a limitation on this utility model.

[0032] like Figure 1 As shown, in order to achieve the above objectives, this utility model proposes a square-shell battery cell cover plate with tabs 22, comprising:

[0033] The cover plate body 10 can be fastened to the stop plate 50 of the square-shell battery cell. The cover plate body 10 is provided with two through holes 11 that correspond one-to-one with the electrodes on the battery cell.

[0034] Two electrode posts 21 are respectively inserted into the via 11 and contact the electrode below the via 11 to achieve electrical conduction; and

[0035] An insulating element 30 is wrapped around the sidewalls of the two pole post 21 assemblies to restrict the conduction between the two pole post 21 assemblies and the cover plate body 10.

[0036] Specifically, the cover plate body 10 is located at the top or opening of the prismatic battery cell and can be fastened to the stop plate 50 of the prismatic battery cell by snap-fit ​​or embedding. The cover plate body 10 is designed in a rectangular or square shape to match the shape of the prismatic battery cell to ensure a secure installation. The cover plate body 10 has two through holes 11, the positions of which correspond to the electrodes of the prismatic battery cell. The function of the through holes 11 is to provide a insertion position for the terminal post 21 assembly, ensuring electrical connection between the electrodes and the terminal post 21 assembly. The layout of these two through holes 11 ensures that current can be drawn from the internal electrodes of the prismatic battery cell and connected to the external circuit through the terminal post 21 assembly.

[0037] Two electrode post assemblies 21 are respectively installed in two through holes 11 of the cover plate body 10. The electrode post 21 assembly includes an electrode post 21 and an electrode tab 22. One end of the electrode post 21 assembly extends downward through the through hole 11 of the cover plate body 10 and connects to the electrode of the prismatic battery cell to ensure smooth current conduction. The contact surface between the electrode post 21 assembly and the inner wall of the through hole 11 is tightly fitted to ensure the stability of the electrode post 21 assembly. The main function of the electrode post 21 assembly is to conduct the electrical energy inside the battery cell through external connection. The electrode post 21 assembly is made of metal material to have good conductivity. The connection between the electrode and the electrode post 21 assembly can be completed by crimping, welding, or bolting to ensure the stability of the connection and conductivity.

[0038] An insulating component 30 covers the sidewall of the terminal post 21 assembly. The function of the insulating component 30 is to restrict the conduction between the terminal post 21 assembly and the cover plate body 10, preventing a short circuit caused by current flowing through the outer wall of the terminal post 21 assembly and the cover plate body 10. The insulating component 30 is made of a material with excellent electrical insulation properties (such as plastic or rubber). The insulating component 30 has a ring-shaped or sleeve-shaped structure, with its inner side tightly attached to the sidewall of the terminal post 21 assembly and its outer side in contact with the inner wall of the through hole 11. In this way, the insulating component 30 can effectively isolate the current flow between the terminal post 21 assembly and the cover plate body 10, ensuring battery safety and preventing unnecessary current leakage.

[0039] By adopting the above technical solution, the electrical connection between the prismatic battery cell and the cover plate body 10 is achieved through the design of the through hole 11 and the electrode post 21 assembly. This allows the electrodes of the prismatic battery cell to be led to the external circuit through the electrode post 21 assembly, ensuring the normal operation of the battery system. The electrode post 21 assembly reduces the welding of the prismatic battery cell tabs 22 during the prototyping process, improving the prototyping efficiency and reducing production costs. The fastening method between the cover plate body 10 and the stop plate 50 simplifies the production process, reduces production costs, and improves assembly efficiency.

[0040] In one embodiment of this application, the pole post 21 assembly includes:

[0041] Terminal 21, which can contact the electrode; and

[0042] The tab 22 is connected to the top of the pole post 21. The tab 22 is provided with a clamping part 221 for easy clamping by the test clip 40. The insulating member 30 covers the connection between the pole post 21 and the tab 22.

[0043] Specifically, the terminal post 21 is located within the through hole 11 of the prismatic cell cover plate, responsible for contacting the electrodes inside the prismatic cell. The terminal post 21 is square in shape, conductive, and made of metallic material to ensure good current conduction. It is conceivable that the terminal post 21 could also be cylindrical, allowing for more flexible installation and fixation. The bottom end of the terminal post 21 connects to the electrode, enabling current to be conducted from inside the cell. The top end of the terminal post 21 connects to the tab 22, serving as a load-bearing element and connecting to the external circuit. The connection between the terminal post 21 and the electrode is made through methods such as crimping, welding, or threaded connection to ensure a robust electrical connection.

[0044] The tab 22 is located at the top of the terminal post 21, and its function is to provide a clamping part 221 for easy clamping by the test clip 40. The tab 22 can be a cube with through holes for easy clamping. Of course, depending on the design requirements, the tab 22 can also be a flat metal sheet or strip structure with a certain degree of bending or folding for easy clamping. The tab 22 is connected to the terminal post 21 by welding, threaded connection, or other methods to ensure a stable connection between the two. The clamping part 221 of the tab 22 is designed to match the test clip 40 in the testing equipment, facilitating current detection or voltage measurement during battery testing. The top of the tab 22 is connected to an external circuit or testing device through the clamping part 221 of the test clip 40 to further complete current output or input.

[0045] The connection between the terminal post 21 and the tab 22 is located within the through hole 11. An insulating component 30 covers this connection, preventing electrical conduction between the connection and the cover plate body 10 and thus preventing current leakage. The insulating component 30 is made of an electrically insulating material, such as plastic, rubber, or polymer, and its structure is annular, sleeve-shaped, or partially wrapped. It covers the connection between the terminal post 21 and the tab 22, forming an insulating layer. The insulating component 30 ensures that current flows only through a predetermined conductive path, preventing short circuits or leakage at the connection between the terminal post 21 and the tab 22. The connection between the insulating component 30 and the terminal post 21 and the tab 22 is generally achieved through physical covering and does not interfere with the electrical connection between the terminal post 21 and the tab 22.

[0046] By adopting the above technical solution, the effective contact between the terminal post 21 and the electrode ensures a good electrical connection between the internal and external circuits of the battery cell, guaranteeing the normal operation of the battery. Simultaneously, the optimization of the clamping part 221 allows the battery to be connected to the test clamp 40 more quickly during testing, improving testing efficiency and ensuring testing accuracy.

[0047] In one embodiment of this application, the clamping part 221 is a through hole that penetrates the side wall of the tab 22.

[0048] By adopting the above technical solution, the clamping part 221 is a through hole that penetrates the side wall of the tab 22, giving the clamping part 221 of the tab 22 greater adaptability and flexibility. This allows for a more stable connection with various types of test clips 40, ensuring that the test clip 40 is firmly clamped onto the clamping part 221 during testing, avoiding test errors or equipment malfunctions caused by poor contact. Simultaneously, the through hole penetrating the side wall of the tab 22 allows the test clip 40 to be connected without positional limitations. The test clip 40 can clamp the tab 22 from any angle or direction, improving operational convenience and efficiency.

[0049] In one embodiment of this application, the outer wall of the through hole is covered with an insulating layer.

[0050] By adopting the above technical solution, an insulating layer is covered on the outer wall of the through hole. The insulating layer effectively isolates the outer wall of the through hole from external circuits or other metal components, preventing accidental contact that could lead to arcing and improving the safety of the battery system. At the same time, the insulating layer can protect the tab 22 and other external components from corrosion or wear, extending the service life of the battery assembly.

[0051] In one embodiment of this application, the insulating element 30 is a plastic sealant.

[0052] Using the above technical solution, the encapsulant, as an insulating material, possesses excellent electrical insulation properties. This effectively prevents current from flowing through the connection between the terminal post 21 and the tab 22 and the cover plate body 10, thus avoiding short circuits and leakage, and ensuring the safety of the battery system. Simultaneously, the encapsulant exhibits excellent heat resistance and chemical corrosion resistance, maintaining stable performance under various extreme environments, enhancing the long-term reliability and stability of the prismatic battery cell. The presence of the encapsulant ensures the stability of the terminal post 21 assembly during operation, preventing its swaying during operation.

[0053] In one embodiment of this application, the cover plate body 10 is provided with an explosion-proof valve 12 that is aligned with the explosion-proof port on the stop plate 50.

[0054] By adopting the above technical solution, the explosion-proof valve 12 can automatically open when the internal pressure of the battery is too high, releasing excess gas and preventing the battery casing from rupturing or exploding due to excessive internal pressure, thereby significantly improving battery safety. By aligning with the explosion-proof port on the stop plate 50, the explosion-proof valve 12 ensures that the gas release channel is unobstructed, avoiding the problem of pressure not being released properly due to misalignment, and improving the reliability of the system.

[0055] In one embodiment of this application, the cover plate body 10 is provided with an injection hole 13 that is aligned with the injection channel on the stop plate 50.

[0056] By adopting the above technical solution, aligning the injection hole 13 with the injection channel can ensure the accuracy and efficiency of the injection process, allowing the liquid to flow smoothly into the battery and ensuring the uniform distribution of liquid or electrolyte inside the battery, thereby improving the performance and stability of the battery.

[0057] This application also discloses a prismatic battery cell, including a prismatic battery cell cover plate with tabs 22 as described in any of the above claims.

[0058] 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 square-shell battery cell cover plate with tabs, characterized in that, include: The cover plate body can be fastened to the stop plate of the square-shell battery cell. The cover plate body is provided with two through holes that correspond one-to-one with the electrodes on the battery cell. Two electrode assemblies are respectively inserted into the via and contact the electrode below the via to achieve electrical conduction; as well as An insulating element is wrapped around the sidewalls of the two pole post assemblies to restrict the conduction between the two pole post assemblies and the cover plate body.

2. The square-shell battery cell cover plate with tabs as described in claim 1, characterized in that, The pole assembly includes: The pole piece can contact the electrode; and A tab is connected to the top of the electrode post. The tab has a clamping part for easy clamping by the test clip. The insulating material covers the connection between the electrode post and the tab.

3. The square-shell battery cell cover plate with tabs as described in claim 2, characterized in that, The clamping part is a through hole, which penetrates the side wall of the electrode tab.

4. The square-shell cell cover plate with tabs as described in claim 3, characterized in that, The outer wall of the through hole is covered with an insulating layer.

5. The square-shell battery cell cover plate with tabs as described in claim 1, characterized in that, The insulating component is a plastic sealant.

6. The square-shell cell cover plate with tabs as described in claim 1, characterized in that, The cover plate body is equipped with an explosion-proof valve that is aligned with the explosion-proof opening on the stop plate.

7. The square-shell cell cover plate with tabs as described in claim 1, characterized in that, The cover plate body is provided with an injection hole that is aligned with the injection channel on the stop plate.

8. A square-shell battery cell, characterized in that, Includes the square-shell cell cover plate with tabs as described in any one of claims 1 to 7.

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