A cylindrical battery

Abstract

The application provides a cylindrical battery, which comprises a pole, a pole sheet, a hollow tube and a busbar, the busbar is arranged at two ends of the hollow tube, the pole sheet is wound around the outer periphery of the hollow tube, the pole sheet is electrically connected with the busbar and conducts heat, and one side of the busbar away from the hollow tube is connected with the pole, and the busbar and the pole conduct heat. The cylindrical battery solves the problem of poor heat dissipation effect of the existing cylindrical battery.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a cylindrical battery. Background Technology

[0002] In cylindrical batteries, the heat transfer path typically involves heat transfer from the internal core to the metal casing, and then heat dissipation to the outside via a heat dissipation device attached to the metal casing. Since the core is composed of positive and negative electrode plates and a separator, and both the positive and negative electrode material layers and the separator layer have low thermal conductivity, the overall heat transfer efficiency is poor. Furthermore, the small surface area of ​​the cylindrical battery casing makes it difficult for heat to dissipate effectively from the core, especially near the center, leading to heat accumulation, higher temperatures at the core center, and uneven temperature distribution throughout the core. This severely impacts the battery's cycle performance and lifespan. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a cylindrical battery that addresses the problem of poor heat dissipation of existing cylindrical batteries.

[0004] The present invention provides a cylindrical battery, including a terminal post, an electrode sheet, a hollow tube, and a busbar. The busbar is disposed at both ends of the hollow tube, and the electrode sheet is wound around the outer periphery of the hollow tube. The electrode sheet is electrically connected to the busbar and conducts heat. The terminal post is connected to the side of the busbar away from the hollow tube, and heat conduction occurs between the busbar and the terminal post.

[0005] Optionally, the electrode includes a positive current collector and a negative current collector, one end of which is welded to the manifold.

[0006] Optionally, a heat-conducting element is provided between the manifold and the electrode post, and the heat-conducting element is located on the outer edge of the manifold.

[0007] Optionally, the manifold is an annular structure with openings at both ends, the manifold is sleeved on both ends of the hollow tube, and the heat-conducting component is arranged in an annular structure on the outer edge of the manifold.

[0008] Optionally, the heat-conducting element is made of an insulating heat-conducting material.

[0009] Optionally, the insulating and thermally conductive material includes aluminum nitride ceramic.

[0010] Optionally, a current cutting-off device is provided between the electrode post and the busbar. The current cutting-off device is an airbag structure. The heat-conducting element is disposed on the outer periphery of the current cutting-off device. A solder joint is provided between the electrode post and the current cutting-off device.

[0011] Optionally, the cylindrical battery further includes a cover plate, through which the terminal posts pass and are connected to the combiner plate.

[0012] Optionally, a heat sink is provided at the end of the pole away from the busbar.

[0013] In this invention, the electrode is welded to the busbar, and the heat generated inside the electrode is transferred to the busbar. Heat conduction occurs between the busbar and the terminal post, transferring heat from the busbar to the terminal post, preventing heat accumulation inside the electrode. The electrode and busbar are electrically connected and thermally conductive, preventing uneven temperature distribution across the electrode, improving overall heat dissipation efficiency, and ensuring the battery's cycle performance and lifespan. Attached Figure Description

[0014] Figure 1 This is a cross-sectional schematic diagram of a cylindrical battery provided in an embodiment of the present invention. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0016] To illustrate the technical solution of the present invention, specific embodiments are described below.

[0017] like Figure 1 As shown, a cylindrical battery according to an embodiment of the present invention includes a terminal post 1, an electrode 2, a hollow tube 3, and a busbar 4. The busbar 4 is disposed at both ends of the hollow tube 3, and the electrode 2 is wound around the outer periphery of the hollow tube 3. The electrode 2 is electrically connected to and thermally conductively conducts heat with the busbar 4. The side of the busbar 4 away from the hollow tube 3 is connected to the terminal post 1, and heat conduction occurs between the busbar 4 and the terminal post 1. Specifically, the electrode 2 and the busbar 4 are electrically connected by welding.

[0018] The electrode post 1 includes a positive electrode post and a negative electrode post, and the busbar 4 includes a positive busbar 4 and a negative busbar 4. The positive electrode post and the positive busbar 4 are connected, and the negative electrode post and the negative busbar 4 are connected. The hollow tube 3 has a steel core.

[0019] In the cylindrical battery of this embodiment, the electrode 2 is welded to the busbar 4, and the heat generated inside the electrode 2 is transferred to the busbar 4. Heat conduction occurs between the busbar 4 and the terminal 1, with the busbar 4 transferring heat to the terminal 1, preventing heat accumulation inside the electrode 2. The electrode 2 and the busbar 4 are electrically connected and thermally conductive, preventing uneven temperature distribution across the electrode 2, improving the overall heat dissipation efficiency of the electrode 2, and ensuring the battery's cycle performance and lifespan.

[0020] In some embodiments of the present invention, the electrode 2 includes a positive current collector 21 and a negative current collector 22, one end of which is welded to the busbar 4. Specifically, the electrode 2 further includes a positive active material and a negative active material, the positive active material being coated on the positive current collector 21 and the negative active material being coated on the negative current collector 22. The end of the positive current collector 21 welded to the busbar 4 is not coated with the positive active material, and the end of the negative current collector 22 welded to another busbar 4 is not coated with the negative active material.

[0021] Furthermore, the positive current collector 21 is made of aluminum foil, and the negative current collector 22 is made of copper foil. Both the positive current collector 21 and the negative current collector 22 are made of metal, which provides good thermal conductivity.

[0022] In some embodiments of the present invention, such as Figure 1 As shown, a heat-conducting element 5 is provided between the manifold 4 and the pole post 1, and the heat-conducting element 5 is located on the outer edge of the manifold 4.

[0023] In some embodiments of the present invention, such as Figure 1 As shown, the manifold 4 is an annular structure with openings at both ends, and is sleeved on both ends of the hollow tube 3. The heat-conducting element 5 is arranged in an annular structure on the outer edge of the manifold 4.

[0024] Furthermore, in some embodiments of the present invention, the heat-conducting element 5 may be designed with a micro heat pipe to further improve the heat dissipation capacity of the cylindrical battery.

[0025] In some embodiments of the present invention, the heat-conducting element 5 is made of an insulating heat-conducting material.

[0026] In some embodiments of the present invention, the insulating and thermally conductive material includes aluminum nitride ceramic.

[0027] In some embodiments of the present invention, such as Figure 1 As shown, a current-cutting device 6 is provided between the terminal post 1 and the busbar 4. The current-cutting device 6 has an airbag structure, and the heat-conducting element 5 is disposed on the outer periphery of the current-cutting device 6. A solder joint is provided between the terminal post 1 and the current-cutting device 6. When a large amount of gas is generated inside the cylindrical battery, the current-cutting device 6, under the pressure of the gas, causes the solder joint between the terminal post 1 and the current-cutting device 6 to detach, resulting in a short circuit inside the cylindrical battery, thereby providing protection.

[0028] In some embodiments of the present invention, such as Figure 1As shown, the cylindrical battery also includes a cover plate 7, and the terminal post 1 passes through the cover plate 7 and is connected to the busbar 4.

[0029] In some embodiments of the present invention, such as Figure 1 As shown, a heat sink 8 is provided at the end of the electrode post 1 away from the manifold 4. Providing a heat sink 8 at one end of the electrode post 1 allows the electrode post 1 to transfer heat to the heat sink 8, enhancing heat dissipation capacity.

[0030] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A cylindrical battery, characterized in that, The device includes an electrode post, an electrode plate, a hollow tube, and a manifold. The hollow tube has a steel core, and the electrode plate is wound around its outer circumference. The electrode plate is electrically connected to and thermally conducts heat with the manifold. The manifold is an annular structure with open ends, and it is fitted onto both ends of the hollow tube. The side of the manifold away from the hollow tube is connected to the electrode post, and heat conduction occurs between the manifold and the electrode post. A heat-conducting element is provided between the manifold and the electrode post, and the heat-conducting element is located at the outer edge of the manifold. The heat-conducting element has a micro heat pipe structure. The electrode includes a positive current collector and a negative current collector. One end of the positive current collector and the negative current collector are respectively sleeved on the outer periphery of the manifold and respectively welded to the manifold. A current cut-off device is provided between the electrode post and the manifold. The current cut-off device is an airbag structure. The heat-conducting component is provided on the outer periphery of the current cut-off device. A solder joint is provided between the electrode post and the current cut-off device.

2. The cylindrical battery according to claim 1, characterized in that, The heat-conducting component is arranged in a ring shape on the outer edge of the manifold.

3. The cylindrical battery according to claim 1, characterized in that, The heat-conducting component is made of insulating and thermally conductive material.

4. The cylindrical battery according to claim 3, characterized in that, The insulating and thermally conductive material includes aluminum nitride ceramic.

5. The cylindrical battery according to claim 1, characterized in that, The cylindrical battery also includes a cover plate, through which the terminal posts pass and are connected to the combiner plate.

6. The cylindrical battery according to claim 1, characterized in that, A heat sink is provided at the end of the pole away from the busbar.

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