Cover plate of cylindrical power battery

Abstract

The utility model discloses a cover plate of a cylindrical power battery, which belongs to the field of power batteries and comprises a pole, a collector plate, lower plastic, a light aluminum sheet, a sealing ring, a pressing plate and upper plastic. The collector plate is arranged on the pole, and the lower plastic is assembled on the pole; the sealing ring is arranged on the pole, and the pole is provided with a light aluminum sheet; upper plastic cement is arranged on the pole; pressing plates are arranged at the top ends of the poles; the upper plastic is arranged between the pressing plate and the light aluminum sheet; the lower plastic is arranged on the periphery of the sealing ring; and the light aluminum sheet is arranged above the lower plastic and the sealing ring. According to the utility model, sealing is directly formed among the sealing gasket, the light aluminum and the pole, so that the sealing performance of a product is greatly improved, and the safety performance of the product is improved.

Description

Technical Field

[0001] This utility model relates to the field of power batteries, specifically a cover plate for a cylindrical power battery. Background Technology

[0002] With the development of new energy sources, new energy vehicles are one of the future trends in automotive development. As a core component of new energy vehicles, the power battery provides the power source. Compared to traditional gasoline-powered vehicles, new energy vehicle power batteries are highly environmentally friendly. Power batteries use electrical energy, producing no direct emissions of harmful substances and causing no pollution to the environment, effectively reducing air and noise pollution. Electric drive systems are highly efficient, unlike internal combustion engines which experience energy losses, thus exhibiting better energy conservation and fully utilizing renewable energy sources, reducing dependence on traditional fossil fuels. Power batteries employ state-of-the-art architecture designs, fully meeting the requirements of automobiles in terms of power capacity and performance, and better adapting to different environments and usage requirements. The operating costs of new energy vehicle power batteries are significantly reduced.

[0003] In the current traditional cylindrical battery cover structure, during the battery manufacturing process, the sealing ring, the lower plastic, and the current collector form a seal. However, the surface of the current collector is relatively rough after welding with the terminal post, which can lead to problems such as leakage and battery short circuit. Utility Model Content

[0004] To address the aforementioned problems in the prior art, the purpose of this utility model is to provide a cover plate for a cylindrical power battery, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A cover plate for a cylindrical power battery includes a terminal post, a current collector, a lower plastic sheet, a light aluminum sheet, a sealing ring, a pressure plate, and an upper plastic sheet. The terminal post has a current collector and a lower plastic sheet. The sealing ring is disposed on the terminal post, and a light aluminum sheet is disposed on the terminal post. The upper plastic sheet is disposed on the terminal post. A pressure plate is disposed at the top of the terminal post. The upper plastic sheet is disposed between the pressure plate and the light aluminum sheet. The lower plastic sheet is disposed around the sealing ring. The light aluminum sheet is disposed above the lower plastic sheet and the sealing ring.

[0007] As a further embodiment of this utility model: the current collector and the electrode are assembled and welded together.

[0008] As a further embodiment of this utility model, the solder joints of the current collector and the electrode are arranged in a ring array.

[0009] As a further embodiment of this utility model: the pole column axially penetrates the current collector, lower plastic, aluminum sheet, sealing ring, pressure plate and upper plastic to form a central conductive channel.

[0010] As a further embodiment of this utility model, the pole is made by stamping, cold heading or extrusion.

[0011] As a further embodiment of this utility model: the lower plastic is provided with an annular groove and a limiting protrusion.

[0012] As a further embodiment of this utility model: the sealing ring is made of fluororubber and has a double flange structure in cross section. The upper flange of the sealing ring forms a line contact seal with the bottom surface of the aluminum sheet, and the lower flange of the sealing ring is interference-fitted with the annular groove of the lower plastic.

[0013] As a further embodiment of this utility model: the aluminum sheet is made of aluminum AL3003.

[0014] As a further embodiment of this utility model: the upper plastic and the lower plastic form a labyrinth-like sealed channel.

[0015] As a further embodiment of this utility model, the lower plastic is made of PP material.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This invention enables a direct seal between the sealing gasket, the aluminum alloy, and the electrode post, greatly improving the product's sealing performance and thus enhancing its safety. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a cover plate for a cylindrical power battery disclosed in an embodiment.

[0019] The attached diagram is labeled as follows: 1. Pole post; 2. Collector plate; 3. Lower plastic; 4. Plain aluminum sheet; 5. Sealing ring; 6. Pressure plate; 7. Upper plastic. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Please see Figure 1 A cover plate for a cylindrical power battery includes a terminal post 1, a current collector 2, a lower plastic 3, a light aluminum sheet 4, a sealing ring 5, a pressure plate 6, and an upper plastic 7.

[0023] The electrode post 1 is provided with a collector plate 2, and a lower plastic 3 is assembled on the electrode post 1; a sealing ring 5 is provided on the electrode post 1, and a light aluminum sheet 4 is provided on the electrode post 1; an upper plastic 7 is provided on the electrode post 1.

[0024] The top of the pole post 1 is provided with a pressure plate 6; the upper plastic 7 is disposed between the pressure plate 6 and the light aluminum sheet 4;

[0025] The current collector 2 and terminal post 1 are assembled and welded together; this ensures a stable connection between the current collector 2 and terminal post 1, increases safety, and facilitates the use of the device. The current collector acts as a bridge during battery charging and discharging, concentrating and conducting electrons distributed throughout the electrode to ensure uniform current distribution. Insufficient conductivity of the current collector can lead to excessively high local current density, causing abnormal temperature rise. The current collector is typically made of copper, aluminum, or nickel-plated steel strip and is located at the connection between the positive and negative electrodes and the tabs, providing structural support and ensuring the internal stability and mechanical strength of the battery. A blocking element is installed at the central through-hole of the current collector to prevent the cylindrical battery core from ejecting during thermal runaway, reducing the risk of short circuits, minimizing the contact area between the electrolyte-laden negative electrode and the external environment, and improving overall battery safety.

[0026] The lower plastic 3 is positioned around the sealing ring 5;

[0027] The aluminum sheet 4 is positioned above the lower plastic 3 and the sealing ring 5;

[0028] The electrode post 1 axially penetrates the current collector 2, lower plastic 3, aluminum sheet 4, sealing ring 5, pressure plate 6 and upper plastic 7 to form a central conductive channel; the current collector 2 is fixed to the lower end face of the electrode post 1 by laser welding, and the welding points are distributed in a ring array; the lower plastic covers the lower part of the electrode post 1 and forms the first-level sealing interface.

[0029] The terminal post 1 is made by stamping, cold heading, or extrusion. The advantages of making battery terminals by stamping, cold heading, or extrusion mainly include the following aspects: Stamping uses a die to apply external force to deform a metal sheet, making it suitable for mass production and characterized by high production efficiency and low cost. Stamped parts have high dimensional accuracy and good surface quality, suitable for manufacturing parts with complex shapes. Cold heading involves placing a metal bar into a die and deforming it through radial forging, suitable for manufacturing high-strength, high-precision parts. Cold-headed parts have good surface quality, high dimensional accuracy, and high material utilization. Extrusion uses a die to extrude a metal billet into the required shape, suitable for producing pipes, bars, etc. Extruded parts have a dense structure, good mechanical properties, and high surface quality.

[0030] The aluminum sheet 4 is made of aluminum AL3003. AL3003 aluminum alloy contains manganese, giving it excellent rust resistance and making it suitable for humid and corrosive environments. The aluminum sheet 4 also has good weldability: this alloy has good weldability and is suitable for various welding processes, ensuring the safety of battery manufacturing. Furthermore, the aluminum sheet 4 has high plasticity; in the annealed state, AL3003 aluminum alloy has high plasticity, making it suitable for cold working to improve its mechanical properties.

[0031] The sealing ring 5 is made of fluororubber and has a double flange structure in cross section. The upper flange of the sealing ring 5 forms a line contact seal with the bottom surface of the aluminum sheet 4, and the lower flange of the sealing ring 5 is interference-fitted with the annular groove of the lower plastic 3.

[0032] The assembly process of this utility model is as follows: ① Assemble the electrode post and the collector plate and then weld them; ② Assemble the lower plastic onto the electrode post; ③ Assemble the sealing ring onto the electrode post; ④ Assemble the aluminum sheet onto the electrode post; ⑤ Assemble the upper plastic onto the aluminum sheet; ⑥ Assemble the pressure plate and the upper plastic.

[0033] The electrode post 1 can be machined from T2 copper, and the manifold 2 can be laser-welded with 0.3mm thick nickel strip, with ≥8 weld points evenly distributed around the circumference. The lower plastic 3 can be made of PP material, including an annular groove and limiting protrusions; the aluminum sheet 4 can be made of 6061 aluminum alloy with an anodized surface treatment; the sealing ring 5 is generally made of fluororubber, with a compression ratio designed to be 25%-30%; the pressure plate 6 is generally made of 304 stainless steel, formed by stamping. The upper plastic 7 and the lower plastic 3 form a labyrinthine sealing channel.

[0034] This invention enables a direct seal between the sealing gasket, the aluminum alloy, and the electrode post, greatly improving the product's sealing performance and thus enhancing its safety.

[0035] In a further embodiment, taking an 18650 battery as an example: the lower end of the terminal post 1 is welded to the current collector 2 using fiber laser welding with a power of 800W and a frequency of 200Hz; the lower plastic 3 is ultrasonically pressed with an amplitude of 50μm and a pressure of 200N; the sealing ring 5 is pre-coated with silicone grease and then pressed in, with the compression controlled at 0.25mm±0.02; the pressure plate 6 is fastened with a torque screwdriver.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and not restrictive in all respects. The scope of this invention is defined by the appended claims rather than the foregoing description, and therefore all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider 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.

Claims

1. A cover plate for a cylindrical power battery, characterized in that, It includes a pole (1), a collector plate (2), a lower plastic sheet (3), a light aluminum sheet (4), a sealing ring (5), a pressure plate (6), and an upper plastic sheet (7); the pole (1) is provided with a collector plate (2), and the lower plastic sheet (3) is assembled on the pole (1); the sealing ring (5) is provided on the pole (1), and the light aluminum sheet (4) is provided on the pole (1); the upper plastic sheet (7) is provided on the pole (1); the pressure plate (6) is provided at the top of the pole (1); the upper plastic sheet (7) is provided between the pressure plate (6) and the light aluminum sheet (4); the lower plastic sheet (3) is provided around the sealing ring (5); and the light aluminum sheet (4) is provided above the lower plastic sheet (3) and the sealing ring (5).

2. The cover plate for a cylindrical power battery according to claim 1, characterized in that, The collector plate (2) and the pole post (1) are assembled and welded together.

3. The cover plate for a cylindrical power battery according to claim 2, characterized in that, The solder joints of the collector plate (2) and the pole post (1) are arranged in a ring array.

4. The cover plate for a cylindrical power battery according to claim 3, characterized in that, The pole (1) axially penetrates the collector plate (2), lower plastic (3), light aluminum sheet (4), sealing ring (5), pressure plate (6) and upper plastic (7) to form a central conductive channel.

5. The cover plate for a cylindrical power battery according to claim 4, characterized in that, The pole (1) is made by stamping, cold forging or extrusion.

6. The cover plate for a cylindrical power battery according to claim 5, characterized in that, The lower plastic (3) is provided with an annular groove and a limiting protrusion.

7. The cover plate for a cylindrical power battery according to claim 6, characterized in that, The sealing ring (5) is made of fluororubber and has a double flange structure. The upper flange of the sealing ring (5) forms a line contact seal with the bottom surface of the aluminum sheet (4), and the lower flange of the sealing ring (5) is interference-fitted with the annular groove of the lower plastic (3).

8. The cover plate for a cylindrical power battery according to claim 7, characterized in that, The light aluminum sheet (4) is made of aluminum AL3003.

9. The cover plate for a cylindrical power battery according to claim 8, characterized in that, The upper plastic (7) and the lower plastic (3) form a labyrinth-like sealed channel.

10. A cover plate for a cylindrical power battery according to claim 9, characterized in that, The lower plastic (3) is made of PP material.

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