A self-filling gasket for cylindrical battery

Abstract

The utility model discloses a self-filling gasket for cylindrical batteries, including a shell with two ends through, the shell is cylindrical, a support column is axially arranged in the middle of the inner cavity of the shell, a first partition and a second partition are arranged between the peripheral wall of the support column and the inner peripheral wall of the shell, the first partition and the second partition are both arranged along the radial direction of the shell, the inner cavity of the shell is divided into an electrolyte cavity and a tab cavity by the first partition and the second partition, the opening at one end of the electrolyte cavity is sealed with a bottom plate, and the opening at the other end of the electrolyte cavity is sealed by a flexible barrier film. The utility model provides a self-filling gasket for cylindrical batteries, which has a simple structure and can replenish electrolyte in the battery in a timely manner without damaging the battery structure, thereby improving battery performance.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a self-liquid replenishing gasket for cylindrical batteries. Background Art

[0002] With the gradual application of lithium-ion batteries in new energy vehicles, two-wheeled vehicles for daily travel, household appliances and other fields, people have increasingly stringent requirements on the performance of lithium-ion batteries. High-power batteries or high-capacity batteries will inevitably consume a large amount of electrolyte during a long cycle, and a series of side reactions will occur inside the battery, producing gas and other by-products. As the cycle progresses, the electrolyte gradually dries up, which will cause the internal resistance of the battery to increase, resulting in waste of heat energy generated by the battery. At the same time, it will also lead to a series of problems such as increased battery impedance, capacity decay, and cycle deterioration. Therefore, how to avoid a series of battery problems caused by insufficient electrolyte in the later stage of the battery, and how to replenish the electrolyte in time and improve battery performance without damaging the battery structure are technical problems that need to be solved urgently. Utility Model Content

[0003] The utility model aims to provide a self-liquid replenishing gasket for a cylindrical battery, which has a simple structure and can replenish electrolyte inside the battery in a timely manner without damaging the battery structure, thereby improving the battery performance.

[0004] The technical solution adopted by the self-liquid replenishing gasket for a cylindrical battery disclosed in the utility model is:

[0005] A self-filling gasket for a cylindrical battery comprises a shell with two ends through, the shell is cylindrical, a support column is axially arranged in the middle of the inner cavity of the shell, a first partition and a second partition are arranged between the circumferential wall of the support column and the inner circumferential wall of the shell, the first partition and the second partition are both arranged along the radial direction of the shell, the inner cavity of the shell is divided into an electrolyte cavity and a tab cavity by the first partition and the second partition, a bottom plate is sealed at the opening at one end of the electrolyte cavity, and the opening at the other end of the electrolyte cavity is sealed by a flexible barrier film.

[0006] As a preferred embodiment, a first support rod is provided at one end of the first partition away from the bottom plate, and both ends of the first support rod extend to the inner circumferential wall of the shell; a second support rod is provided at one end of the second partition away from the bottom plate, and both ends of the second support rod extend to the inner circumferential wall of the shell.

[0007] As a preferred embodiment, the opening of the electrolyte chamber away from the bottom plate is divided into a first liquid injection port, a second liquid injection port and a third liquid injection port by a first support rod and a second support rod. The first liquid injection port is sealed by a first flexible barrier membrane, the second liquid injection port is sealed by a second flexible barrier membrane, and the third liquid injection port is sealed by a third flexible barrier membrane.

[0008] As a preferred solution, the first support rod and the second support rod cross to form a cross-shaped structure.

[0009] As a preferred solution, the shell, support column, bottom plate, first partition plate and second partition plate are integrally formed of plastic.

[0010] As a preferred solution, the flexible barrier film is made of polyethylene or polypropylene.

[0011] As a preferred solution, the diameter of the shell is 10-50 mm.

[0012] The utility model discloses a self-replenishing gasket for a cylindrical battery, which has the following beneficial effects: after the electrolyte cavity inside the shell is filled with electrolyte, it is sealed with a flexible barrier film, the shell is placed on the negative electrode side or the positive electrode side of the cylindrical battery roll core to play a supporting and insulating role, the pole ear cavity is used for welding with the positive electrode or the negative electrode, when the battery is cyclically used, a large amount of electrolyte is consumed to produce a series of side reactions to continuously form by-product gas, the gas inside the battery forms pressure, and pressure is applied to the flexible barrier film sealing the electrolyte cavity, when the pressure reaches a critical value, the flexible barrier film will detach from the opening of the electrolyte cavity, and the electrolyte inside will flow out in a vertical direction under the pressure and the capillary action of the pole piece, and penetrate the entire roll core, so that the electrolyte inside the battery can be replenished in time without damaging the battery structure, thereby improving the battery performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model is a structural schematic diagram of a self-liquid replenishing gasket for a cylindrical battery.

[0014] Figure 2 The utility model is a structural schematic diagram of the inner cavity of a self-liquid replenishing gasket shell for a cylindrical battery.

[0015] Figure 3 It is a structural schematic diagram of another embodiment of a self-liquid replenishing gasket for a cylindrical battery of the utility model.

[0016] 10. Shell; 11. Support column; 12. First partition; 13. Second partition; 14. Tab cavity; 15. Bottom plate; 21. First support rod; 22. Second support rod; 31. First flexible barrier membrane; 32. Second flexible barrier membrane; 33. Third flexible barrier membrane. DETAILED DESCRIPTION

[0017] The present invention is further described and illustrated below in conjunction with specific embodiments and accompanying drawings:

[0018] Please refer to Figure 1 and Figure 2A self-filling gasket for a cylindrical battery comprises a shell 10 with two ends penetrated, the shell 10 is cylindrical, a support column 11 is axially arranged in the middle of the inner cavity of the shell 10, a first partition 12 and a second partition 13 are arranged between the peripheral wall of the support column 11 and the inner peripheral wall of the shell 10, the first partition 12 and the second partition 13 are both arranged along the radial direction of the shell 10, the inner cavity of the shell 10 is divided into an electrolyte cavity and a tab cavity 14 by the first partition 12 and the second partition 13, a bottom plate 15 is sealed at the opening at one end of the electrolyte cavity, and the opening at the other end of the electrolyte cavity is sealed by a flexible barrier film.

[0019] In the above scheme, the electrolyte cavity inside the shell 10 is filled with electrolyte and then sealed with a flexible barrier film. The shell 10 is placed on the negative side or positive side of the cylindrical battery roll core to play a supporting and insulating role. The ear cavity 14 is used to weld with the positive or negative electrode. When the battery is recycled, a large amount of electrolyte will be consumed to produce a series of side reactions, thereby continuously forming by-product gas. The gas inside the battery forms pressure, which exerts pressure on the flexible barrier film sealing the electrolyte cavity. When the pressure reaches a critical value, the flexible barrier film will detach from the opening of the electrolyte cavity, and the internal electrolyte will flow out in a vertical direction under the pressure and the capillary action of the electrode, and penetrate the entire roll core, so that the electrolyte can be replenished in time inside the battery without damaging the battery structure, thereby improving battery performance.

[0020] Please refer to Figure 1 and Figure 2 A first support rod 21 is provided at one end of the first partition 12 away from the bottom plate 15, and both ends of the first support rod 21 extend to the inner circumferential wall of the shell 10. A second support rod 22 is provided at one end of the second partition 13 away from the bottom plate 15, and both ends of the second support rod 22 extend to the inner circumferential wall of the shell 10.

[0021] In the above solution, the first support rod 21 and the second support rod 22 form a bracket, which further strengthens the supporting function and also facilitates the sealing of the flexible barrier film.

[0022] Please refer to Figure 1 and Figure 2 , the opening of the electrolyte chamber away from the bottom plate 15 is divided into a first liquid injection port, a second liquid injection port and a third liquid injection port by the first support rod 21 and the second support rod 22. The first liquid injection port is sealed by the first flexible barrier film 31, the second liquid injection port is sealed by the second flexible barrier film 32, and the third liquid injection port is sealed by the third flexible barrier film 33. In this embodiment, the flexible barrier film and the shell are connected by a sealant. Specifically, the first support rod 21 and the second support rod 22 cross to form a cross-shaped structure. In addition, it should be noted that in other embodiments, the first support rod 21 and the second support rod 22 can cross to form structures of other shapes, and a third support rod and a fourth support rod can also be added.

[0023] In the above scheme, the electrolyte opening is divided into three injection ports by the first support rod 21 and the second support rod 22, and the three injection ports are sealed with a flexible barrier film. The pressure generated by the gas inside the battery will gradually break through the three flexible barrier films, and the electrolyte inside the electrolyte cavity will flow out and penetrate the entire winding core. In this embodiment, the first support rod 21 and the second support rod 22 cross to form a cross-shaped structure, and one of the openings is the opening of the tab cavity 14.

[0024] Please refer to Figure 2 The housing 10, the support column 11, the bottom plate 15, the first partition plate 12 and the second partition plate 13 are integrally formed of plastic.

[0025] In the above scheme, the one-piece molding is easy to produce and has low cost. It is specifically composed of plastic materials with certain elasticity and strength and acid and alkali corrosion resistance, including but not limited to polyurethane, ABS plastic, polycarbonate, polytetrafluoroethylene and other materials.

[0026] Please refer to Figure 1 , the flexible barrier film is made of polyethylene or polypropylene.

[0027] In the above solution, the flexible barrier film is made of a material having certain flexibility and being resistant to acid and alkali corrosion and a certain high temperature, including but not limited to polyethylene, polypropylene, glass fiber and other materials.

[0028] Please refer to Figure 1 , the diameter of the housing 10 is 10-50 mm.

[0029] In the above solution, different types of cylindrical batteries require different diameters of the shell 10, such as 18650, 21700, 4680 and 46950, etc. The specific diameter of the shell 10 is set according to specific needs.

[0030] Please refer to Figure 3 When the inner winding core of the cylindrical battery is a full-ear structure, there is no need to set the ear cavity 14, and the entire inner cavity of the shell 10 serves as the electrolyte cavity.

[0031] The utility model provides a self-replenishing gasket for a cylindrical battery. After the electrolyte cavity inside the shell is filled with electrolyte, it is sealed with a flexible barrier film. The shell is placed on the negative electrode side or the positive electrode side of the cylindrical battery roll core to play a supporting and insulating role. The pole ear cavity is used for welding with the positive electrode or the negative electrode. When the battery is cyclically used, a large amount of electrolyte is consumed to produce a series of side reactions to continuously form by-product gas. The gas inside the battery forms pressure, which applies pressure to the flexible barrier film that seals the electrolyte cavity. When the pressure reaches a critical value, the flexible barrier film will detach from the opening of the electrolyte cavity. The electrolyte inside flows out in a vertical direction under the pressure and the capillary action of the pole piece, and penetrates the entire roll core, so that the electrolyte inside the battery can be replenished in time without damaging the battery structure, thereby improving the battery performance.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.

Claims

1. A self-liquid replenishing gasket for a cylindrical battery, characterized in that: It includes a shell with two ends through, the shell is cylindrical, a support column is axially provided in the middle of the inner cavity of the shell, a first partition and a second partition are provided between the circumferential wall of the support column and the inner circumferential wall of the shell, the first partition and the second partition are both arranged along the radial direction of the shell, the inner cavity of the shell is divided into an electrolyte cavity and a tab cavity by the first partition and the second partition, a bottom plate is sealed at the opening at one end of the electrolyte cavity, and the opening at the other end of the electrolyte cavity is sealed by a flexible barrier membrane.

2. A self-liquid replenishing gasket for a cylindrical battery as claimed in claim 1, characterized in that: The first partition is provided with a first support rod at one end away from the bottom plate, and both ends of the first support rod extend to the inner circumferential wall of the shell; the second partition is provided with a second support rod at one end away from the bottom plate, and both ends of the second support rod extend to the inner circumferential wall of the shell.

3. A self-liquid replenishing gasket for a cylindrical battery as claimed in claim 2, characterized in that: The opening of the electrolyte chamber away from the bottom plate is divided into a first liquid injection port, a second liquid injection port and a third liquid injection port by a first support rod and a second support rod. The first liquid injection port is sealed by a first flexible barrier membrane, the second liquid injection port is sealed by a second flexible barrier membrane, and the third liquid injection port is sealed by a third flexible barrier membrane.

4. A self-liquid replenishing gasket for a cylindrical battery as claimed in claim 3, characterized in that: The first support rod and the second support rod cross to form a cross-shaped structure.

5. A self-filling gasket for a cylindrical battery as claimed in claim 1, characterized in that: The shell, the support column, the bottom plate, the first partition plate and the second partition plate are integrally formed of plastic.

6. A self-filling gasket for a cylindrical battery as claimed in claim 1, characterized in that: The flexible barrier film is made of polyethylene or polypropylene.

7. A self-liquid replenishing gasket for a cylindrical battery as claimed in claim 1, characterized in that: The diameter of the shell is 10-50 mm.

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