Cylindrical battery

Abstract

The utility model provides a cylindrical battery. The cylindrical battery comprises a shell, a negative electrode part is arranged at one end of the shell along the axial direction of the cylindrical battery, and a positive electrode part is arranged at the other end of the shell; the roll core is positioned in the shell; the supporting component is located in the shell, the winding core is wound around the periphery of the supporting component, and the two ends of the supporting component are connected with the negative electrode part and the positive electrode part respectively. According to the technical scheme, the problems that the service life and the safety performance of the battery are influenced by high temperature due to the fact that heat generated in the battery cannot be effectively dissipated because the cylindrical battery in the prior art is difficult to give full play to the axial heat conduction capability of the roll core are solved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a cylindrical battery. Background Technology

[0002] Due to the unique wound structure of cylindrical batteries, the axial thermal conductivity of the core is much higher than that in the radial direction, limiting the increase in both the radial and axial dimensions of the cylindrical battery. To form a conductive path, the top and bottom of the core are connected to the current collector via welding. While the relatively small thickness of the current collector and the limited contact area ensure sufficient electrical contact, they reduce the axial thermal conductivity of the core. Therefore, it is difficult to fully utilize the axial thermal conductivity of the core, resulting in ineffective dissipation of heat generated inside the battery, leading to high temperatures that affect the battery's lifespan and safety performance. Utility Model Content

[0003] The main objective of this invention is to provide a cylindrical battery that solves the problem that existing cylindrical batteries cannot fully utilize the axial heat conduction capacity of the core, resulting in the inability to effectively dissipate heat generated inside the battery, which leads to high temperatures affecting the battery's lifespan and safety performance.

[0004] To achieve the above objectives, this utility model provides a cylindrical battery, comprising: a casing, with a negative electrode portion at one end and a positive electrode portion at the other end along the axial direction of the cylindrical battery; a core located inside the casing; and a support member located inside the casing, with the core wound around the outer periphery of the support member, and both ends of the support member connected to the negative electrode portion and the positive electrode portion, respectively.

[0005] Furthermore, the support member includes two conductive elements and an insulating element for connecting the two conductive elements; the core has a positive terminal and a negative terminal, the positive terminal being wound around one of the two conductive elements, and the negative terminal being wound around the other of the two conductive elements.

[0006] Furthermore, the supporting components are hollow tubular structures.

[0007] Furthermore, the tubular structure has an end cap at one end facing the positive electrode, and the end cap is connected to the positive electrode.

[0008] Furthermore, a through hole is provided on the negative electrode part, and the outer wall of the tubular structure is connected to the inner wall of the through hole.

[0009] Furthermore, the interior of the tubular structure is lined with insulating and thermally conductive material.

[0010] Furthermore, a temperature sensor is installed inside the tubular structure.

[0011] Furthermore, the two ends of the support member are welded to the negative electrode and the positive electrode, respectively.

[0012] Furthermore, the core includes: a positive electrode sheet, comprising a positive current collector and a positive active layer, with the positive active layer provided on both sides of the positive current collector, and a portion of the positive current collector protruding from the positive active layer along the circumference of the cylindrical battery to form a positive electrode connection end; a negative electrode sheet, comprising a negative current collector and a negative active layer, with the negative active layer provided on both sides of the negative current collector, and a portion of the negative current collector protruding from the negative active layer along the circumference of the cylindrical battery to form a negative electrode connection end; and a separator, located between the positive electrode sheet and the negative electrode sheet to separate the positive electrode sheet and the negative electrode sheet.

[0013] Furthermore, along the axial direction of the cylindrical battery, a portion of the positive electrode current collector protrudes from the positive electrode active layer to form a positive electrode tab, which is connected to the positive electrode portion; along the axial direction of the cylindrical battery, a portion of the negative electrode current collector protrudes from the negative electrode active layer to form a negative electrode tab, which is connected to the negative electrode portion.

[0014] By applying the technical solution of this utility model, the two ends of the support member are welded to the positive electrode and the negative electrode respectively, which can form an efficient heat conduction path. This allows the heat of the core to be transferred not only directly to the positive electrode and the negative electrode, but also through the support member. This enhances the axial heat conduction of the battery and promotes the effective dissipation of heat from the internal core, thereby reducing the negative impact of high temperature on battery life and safety performance. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0016] Figure 1 A schematic diagram of an embodiment of the cylindrical battery of this utility model is shown;

[0017] Figure 2 It shows Figure 1 A schematic diagram of the assembly structure of the cylindrical battery casing and the winding core;

[0018] Figure 3 It shows Figure 1 A schematic diagram of the supporting components for a cylindrical battery.

[0019] The above figures include the following reference numerals:

[0020] 11. Shell; 12. Negative electrode; 13. Positive electrode; 14. Core; 15. Through hole; 20. Supporting component; 21. Conductive component; 22. Insulating component; 23. End cap. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] It should be noted that the cylindrical battery in the embodiment of this utility model is a full-tab cylindrical battery.

[0023] The inventors know of a cylindrical battery that improves heat conduction by conducting heat to only one end.

[0024] Therefore, as Figures 1 to 3 As shown, an embodiment of this utility model provides a cylindrical battery. The cylindrical battery includes: a housing 11, with a negative electrode portion 12 at one end and a positive electrode portion 13 at the other end of the housing 11 along the axial direction of the cylindrical battery; a core 14 located inside the housing 11; and a support member 20 located inside the housing 11, with the core 14 wound around the outer periphery of the support member 20, and both ends of the support member 20 connected to the negative electrode portion 12 and the positive electrode portion 13, respectively.

[0025] In the above technical solution, the two ends of the support member 20 are welded to the positive electrode part 13 and the negative electrode part 12 respectively, which can form an efficient heat conduction path. This allows the heat of the core 14 to be directly transferred to the positive electrode part 13 and the negative electrode part 12, and also to the positive electrode part 13 and the negative electrode part 12 through the support member 20. This enhances the axial heat conduction of the battery and promotes the effective dissipation of heat from the internal core, thereby reducing the negative impact of high temperature on battery life and safety performance.

[0026] Preferably, in the embodiments of this utility model, the shell 11 is a steel shell.

[0027] like Figure 1 and Figure 3 As shown in the embodiment of this utility model, the support member 20 includes two conductive elements 21 and an insulating element 22 for connecting the two conductive elements 21; the core 14 has a positive terminal and a negative terminal, the positive terminal is wound around one of the two conductive elements 21, and the negative terminal is wound around the other conductive element 21.

[0028] In the above technical solution, by setting empty foil areas at the ends of the positive and negative electrode sheets, and at the beginning of winding, the empty foil areas of the positive and negative electrode sheets (i.e., the positive and negative electrode foils form the positive electrode connection end and the negative electrode connection end) are respectively wound to the two conductive parts 21 of the support member 20. In this way, the electronic conduction path inside the battery can be optimized, the internal resistance of the battery can be reduced, and thus the electrical performance and energy efficiency of the battery can be improved.

[0029] Preferably, in an embodiment of the present invention, the two conductive elements 21 are made of conductive metal material.

[0030] Furthermore, an insulating element 22 made of insulating material is used between the two conductive elements 21 to avoid the risk of internal short circuits while maintaining the continuity of heat conduction.

[0031] In existing technologies, the winding needle or central tube structure has been largely eliminated in the all-tab cylindrical battery structure. While improving energy density, this has also introduced numerous problems. For example, stress during electrode cycling can cause the central hole to collapse, and poor electrode interface contact can further reduce the battery's thermal conductivity. The needle-pulling process during winding can lead to electrode misalignment, which can affect the safe use of the battery. In this invention, the support member 20 acts as a winding needle during the electrode winding process, eliminating the need for needle-pulling operations. This avoids the problems of central hole collapse and electrode misalignment caused by traditional needle-pulling processes. By winding the positive and negative electrode foils onto the conductive part of the support member 20, a tight contact between the core 14 and the support member 20 is ensured, enhancing the stability of the battery structure and effectively preventing the decrease in thermal conductivity caused by poor electrode interface contact.

[0032] like Figure 3 As shown in the embodiment of this utility model, the support member 20 is a hollow tubular structure.

[0033] In the above technical solution, the tubular support member 20 is used as a winding needle during the battery winding process, which effectively guides the winding of the positive and negative electrode sheets, maintains the geometry of the core 14, and avoids the problem of center hole collapse caused by traditional needle pulling process.

[0034] like Figure 3 As shown in the embodiment of this utility model, an end cap 23 is provided at one end of the tubular structure facing the positive electrode portion 13, and the end cap 23 is connected to the positive electrode portion 13. In this way, by welding the end cap 23 to the positive electrode portion 13, the connection between the support member 20 and the positive electrode portion 13 can be realized, thereby facilitating the connection between the support member 20 and the positive electrode portion 13.

[0035] In one embodiment, the end of the tubular structure facing the negative electrode portion 12 is open or closed.

[0036] like Figure 1 As shown in the embodiment of this utility model, the negative electrode part 12 is provided with a through hole 15, and the outer wall of the tubular structure is connected to the inner wall of the through hole 15.

[0037] With the above setup, liquid can be injected through the through hole 15. After the liquid injection is completed, the outer wall of the tubular structure can be directly welded to the inner wall of the through hole 15. This eliminates the need for the installation steps of the injection hole rubber plug and end cap, thereby simplifying the battery manufacturing process, improving production efficiency, and reducing costs.

[0038] Preferably, in this embodiment of the invention, the tubular structure is internally filled with an insulating and thermally conductive material. This filling of the supporting member 20 with an insulating and thermally conductive material improves axial heat conduction, ensures uniform heat distribution within the battery, thereby reducing the battery's temperature rise under high loads, extending battery life, and ensuring battery safety. The insulating and thermally conductive material can be thermally conductive silicone grease or graphene thermal pads, etc.

[0039] Preferably, in an embodiment of this invention, a temperature sensor is provided inside the tubular structure. This enables real-time monitoring of the battery's internal temperature, improving the accuracy of battery thermal management and ensuring the battery operates within a safe temperature range, thereby enhancing the ability to predict and control safety risks.

[0040] Preferably, in this embodiment of the invention, the two ends of the support member 20 are welded to the negative electrode portion 12 and the positive electrode portion 13, respectively. This effectively enhances the overall structural strength of the battery, especially during the cyclic charging and discharging process, reducing deformation of the casing 11 and improving the battery's durability and safety.

[0041] Specifically, in this embodiment of the present invention, the core 14 includes: a positive electrode sheet, comprising a positive current collector and a positive active layer, with the positive active layer disposed on both sides of the positive current collector, and a portion of the positive current collector protruding from the positive active layer along the circumference of the cylindrical battery to form a positive electrode connection end; a negative electrode sheet, comprising a negative current collector and a negative active layer, with the negative active layer disposed on both sides of the negative current collector, and a portion of the negative current collector protruding from the negative active layer along the circumference of the cylindrical battery to form a negative electrode connection end; and a separator, located between the positive and negative electrode sheets to separate them. In this way, the positive and negative electrode connection ends can be wound onto the two conductive elements 21 of the support member 20, thereby optimizing the electronic conduction path inside the battery, reducing the internal resistance of the battery, and thus improving the battery's electrical performance and energy efficiency.

[0042] Specifically, in the embodiments of this utility model, along the axial direction of the cylindrical battery, a portion of the positive electrode current collector protrudes from the positive electrode active layer to form a positive electrode tab, which is connected to the positive electrode portion; along the axial direction of the cylindrical battery, a portion of the negative electrode current collector protrudes from the negative electrode active layer to form a negative electrode tab, which is connected to the negative electrode portion.

[0043] The above configuration significantly increases the effective contact area for current conduction, reduces the battery's contact resistance, and thus improves the battery's conductivity and power output. Furthermore, the direct connection of the tabs enhances the battery's axial thermal conductivity, facilitating rapid heat dissipation from the battery's interior, reducing temperature rise during high-power discharge, extending battery life, and improving battery safety.

[0044] Preferably, in the embodiments of this utility model, the positive electrode portion 13 is a positive electrode post, and the negative electrode portion 12 is a negative electrode cover plate.

[0045] As can be seen from the above description, the above embodiments of this utility model achieve the following technical effects: the two ends of the support member are welded to the positive electrode and the negative electrode respectively, which can form an efficient heat conduction path, so that the heat of the core can not only be directly transferred to the positive electrode and the negative electrode, but also transferred to the positive electrode and the negative electrode through the support member. In this way, the heat conduction of the battery in the axial direction is enhanced, which can promote the effective dissipation of heat in the internal core, thereby reducing the negative impact of high temperature on battery life and safety performance.

[0046] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A cylindrical battery, characterized in that, include: The housing (11) has a negative electrode portion (12) at one end and a positive electrode portion (13) at the other end along the axial direction of the cylindrical battery. The core (14) is located inside the housing (11); A support member (20) is located inside the housing (11), and the core (14) is wound around the outer periphery of the support member (20). The two ends of the support member (20) are respectively connected to the negative electrode part (12) and the positive electrode part (13).

2. The cylindrical battery according to claim 1, characterized in that, The support member (20) includes two conductive elements (21) and an insulating element (22) for connecting the two conductive elements (21); The core (14) has a positive terminal and a negative terminal. The positive terminal is wound around one of the two conductive elements (21), and the negative terminal is wound around the other of the two conductive elements (21).

3. The cylindrical battery according to claim 1, characterized in that, The supporting member (20) is a hollow tubular structure.

4. The cylindrical battery according to claim 3, characterized in that, The tubular structure has an end cap (23) facing the positive electrode (13) at one end, and the end cap (23) is connected to the positive electrode (13).

5. The cylindrical battery according to claim 3, characterized in that, The negative electrode part (12) is provided with a through hole (15), and the outer wall of the tubular structure is connected to the inner wall of the through hole (15).

6. The cylindrical battery according to claim 3, characterized in that, The tubular structure is internally lined with insulating and thermally conductive material.

7. The cylindrical battery according to claim 3, characterized in that, A temperature sensor is installed inside the tubular structure.

8. The cylindrical battery according to any one of claims 1 to 7, characterized in that, The two ends of the support member (20) are welded to the negative electrode part (12) and the positive electrode part (13), respectively.

9. The cylindrical battery according to claim 2, characterized in that, The core (14) includes: A positive electrode sheet includes a positive current collector and a positive active layer. The positive active layer is provided on both sides of the positive current collector. Along the circumference of the cylindrical battery, part of the positive current collector protrudes from the positive active layer to form the positive electrode connection terminal. The negative electrode sheet includes a negative electrode current collector and a negative electrode active layer. The negative electrode active layer is provided on both sides of the negative electrode current collector. Along the circumference of the cylindrical battery, part of the negative electrode current collector protrudes from the negative electrode active layer to form the negative electrode connection end. A separator is located between the positive electrode and the negative electrode to separate the positive electrode and the negative electrode.

10. The cylindrical battery according to claim 9, characterized in that, Along the axial direction of the cylindrical battery, a portion of the positive electrode current collector protrudes from the positive electrode active layer to form a positive electrode tab, which is connected to the positive electrode portion; along the axial direction of the cylindrical battery, a portion of the negative electrode current collector protrudes from the negative electrode active layer to form a negative electrode tab, which is connected to the negative electrode portion.

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