Cylindrical battery explosion-proof valve

Abstract

The utility model relates to a cylindrical battery explosion-proof valve, which belongs to the technical field of new energy automobiles and comprises a cylindrical battery body, nicks are arranged at the bottom of a shell of the cylindrical battery body, and the nicks are crisscrossed to form a honeycomb shape to form honeycomb-shaped nicks. When the cylindrical battery body is out of control due to high temperature overheating, the honeycomb-shaped nicks crack quickly, and pressure is released to the outside in time. According to the cylindrical battery anti-explosion valve disclosed by the utility model, the existing nicks which are completely circular or partially circular are designed to be honeycomb-shaped, so that the regular hexagonal nick units can be quickly bounced off during thermal runaway, enough channels are provided for gas diffusion, the blockage of the anti-explosion valve during thermal runaway of the battery is reduced, the gas accumulation is avoided, and the battery explosion is prevented; and the safety of the battery is well improved, and popularization and application are facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of new energy vehicles, and particularly relates to a cylindrical battery explosion-proof valve. Background Art

[0002] With the increase in the stock of electric vehicles, the number of safety accidents of new energy vehicles has shown an increasing trend. Consumers have gradually shifted from "range anxiety" to "safety anxiety", and safety issues have become a stumbling block to the development of new energy vehicle products. Considering the market trend, safety issues have become a key factor restricting the development of electric vehicles, and improving safety is an inevitable requirement for the power battery system in the era dominated by electric vehicles. Ensuring the safety of the battery and the whole vehicle requires starting from three aspects: "intrinsic safety", "active safety", and "passive safety" of the battery.

[0003] A battery explosion-proof valve is a device used to ensure the safety of the battery. It is applied during the charging and discharging process of the battery to ensure that the pressure and temperature inside the battery are within a safe range and prevent safety issues such as overcharging, over-discharging, and overheating of the battery. When the internal gas pressure of the battery exceeds a certain value, the battery explosion-proof valve will automatically open to release the internal pressure of the battery and prevent the battery from exploding. At the same time, the battery explosion-proof valve can also detect the internal temperature of the battery. When the temperature is abnormally high, it can also automatically open the battery explosion-proof valve to ensure the safety of the battery.

[0004] The cylindrical battery explosion-proof valve is a common type of battery explosion-proof valve. Currently, a notch in the shape of a complete circle or a partial circle (such as a C shape) is designed in the center of the bottom of the cell housing for the cylindrical battery explosion-proof valve. When the internal pressure of the battery continues to rise to a certain value, the notch at the bottom of the cylindrical battery explosion-proof valve housing cracks outward, the current circuit of the cell is cut off, the cylindrical battery explosion-proof valve is damaged, and the high-temperature and high-pressure gas generated inside the cell is discharged outward to prevent the battery from exploding. However, during the actual process of valve spraying, the cylindrical battery explosion-proof valve is prone to blockage, which hinders the diffusion of gas and the positive and negative active substances carried out during gas spraying, leading to battery thermal runaway. In short, the existing design of the cylindrical battery explosion-proof valve is insufficient to meet the requirement of rapid pressure relief, and a more effective method for relieving the pressure of the battery is needed. Summary of the Utility Model

[0005] Aiming at the above problems, the purpose of the utility model is to provide a cylindrical battery explosion-proof valve to solve the problem that the existing design of the cylindrical battery explosion-proof valve is insufficient to meet the requirement of rapid pressure relief.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The utility model discloses an explosion-proof valve for a cylindrical battery, which comprises a cylindrical battery body. A notch is arranged at the bottom of the outer shell of the cylindrical battery body. It is characterized in that the notches crisscross to form a honeycomb shape, thus forming a honeycomb-shaped notch.

[0008] When the cylindrical battery body gets out of control due to high temperature and overheating, the honeycomb-shaped notch quickly cracks to release pressure to the outside in a timely manner.

[0009] Preferably, the honeycomb-shaped notch comprises a plurality of regular hexagon notch units. The adjacent sides of each adjacent regular hexagon notch unit overlap with each other and are arranged in a honeycomb shape to form the honeycomb-shaped notch.

[0010] Preferably, the diameter of the bottom of the outer shell of the cylindrical battery body is 18 to 80 mm.

[0011] Preferably, the side length of the regular hexagon notch unit is 2 to 10 mm.

[0012] Preferably, the number of the regular hexagon notch units is 2 to 20.

[0013] Preferably, the notch breaking pressure of the regular hexagon notch unit is between 0.6 MPa and 1 MPa.

[0014] Preferably, the tolerance of the breaking pressure of each regular hexagon notch unit at the bottom of the outer shell of the cylindrical battery body is 0.01 to 0.15 MPa.

[0015] Preferably, the area of the honeycomb-shaped notch covering the bottom of the outer shell of the cylindrical battery body is at least more than 50%.

[0016] Due to the adoption of the above technical solutions, the utility model has the following advantages:

[0017] An explosion-proof valve for a cylindrical battery disclosed by the utility model comprises a cylindrical battery body. A notch is arranged at the bottom of the outer shell of the cylindrical battery body. The notches crisscross to form a honeycomb shape, thus forming a honeycomb-shaped notch. When the cylindrical battery body gets out of control due to high temperature and overheating, the honeycomb-shaped notch quickly cracks to release pressure in a timely manner, reducing the risk of the battery core in the cylindrical battery body spreading to the surroundings. An explosion-proof valve for a cylindrical battery disclosed by the utility model designs the existing notch in a complete circular or partial circular shape into a honeycomb shape. During thermal runaway, the regular hexagon notch units can quickly pop open, providing sufficient channels for gas diffusion, reducing the blockage of the explosion-proof valve during battery thermal runaway, avoiding gas accumulation, preventing battery explosion, greatly improving the safety of the battery, and being beneficial to popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the explosion-proof valve body of the cylindrical battery disclosed in Embodiment 1 of the utility model;

[0019] Figure 2 It is a top view of the honeycomb-like indentations at the bottom of the outer shell of the cylindrical battery explosion-proof valve body disclosed in Embodiment 1 of the present utility model.

[0020] Explanation of reference numerals: 1 - cylindrical battery body, 2 - bottom of the outer shell, 3 - regular hexagon indentation unit. Detailed implementation manners

[0021] Hereinafter, the exemplary embodiments of the present utility model will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present utility model can be more thoroughly understood and the scope of the present utility model can be completely conveyed to those skilled in the art.

[0022] A cylindrical battery explosion-proof valve disclosed by the present utility model adopts a honeycomb-like design concept and is designed with a honeycomb arrangement of regular hexagon indentation units 3 in terms of structure. When the battery is out of control due to thermal runaway, the cylindrical battery explosion-proof valve can break into small pieces, quickly opening the pressure relief channel, avoiding blockage of the cylindrical battery explosion-proof valve, providing sufficient diffusion channels for gas diffusion, and reducing the risk of the battery diffusing to the surroundings.

[0023] To solve the problem that the existing design of the cylindrical battery explosion-proof valve is insufficient to meet the requirement of rapid pressure relief, a cylindrical battery explosion-proof valve disclosed by the present utility model includes a cylindrical battery body. The bottom of the outer shell of the cylindrical battery body is provided with indentations, and the indentations are criss-crossed to form a honeycomb-like shape, forming honeycomb-like indentations. When the cylindrical battery body gets out of control due to high temperature and overheating, the honeycomb-like indentations quickly crack to release pressure in time, reducing the risk of the battery core in the cylindrical battery body diffusing to the surroundings. A cylindrical battery explosion-proof valve disclosed by the present utility model designs the existing indentations in the shape of a complete circle or a partial circle into a honeycomb-like shape. During thermal runaway, the regular hexagon indentation units can quickly pop open, providing sufficient channels for gas diffusion, reducing blockage of the explosion-proof valve during battery thermal runaway, avoiding gas accumulation, preventing battery explosion, greatly improving the safety of the battery, and being conducive to popularization and application.

[0024] Embodiment 1

[0025] Embodiment 1 of the present utility model provides a cylindrical battery explosion-proof valve, and its structure will be described in detail below with reference to the accompanying drawings.

[0026] Refer to Figure 1 and Figure 2 , the cylindrical battery explosion-proof valve includes a cylindrical battery body 1. The bottom 2 of the outer shell of the cylindrical battery body 1 is provided with indentations, and the indentations are criss-crossed to form a honeycomb-like shape, forming honeycomb-like indentations.

[0027] When the cylindrical battery body 1 gets out of control due to high temperature overheating, the honeycomb-shaped indentations crack rapidly, releasing pressure to the outside in a timely manner and reducing the risk of the battery cells inside the cylindrical battery body 1 spreading to the surroundings.

[0028] The cylindrical battery body 1 is internally configured with battery cells. In order to reduce the risk of explosion-proof valve blockage and battery cell explosion, the honeycomb-shaped indentations include a number of regular hexagon indentation units 3. The adjacent sides of each adjacent regular hexagon indentation unit 3 overlap with each other and are arranged in a honeycomb shape to form the honeycomb-shaped indentations.

[0029] Specifically, the diameter of the bottom 2 of the outer shell of the cylindrical battery body 1 is 18 to 80 mm.

[0030] Specifically, the side length of the regular hexagon indentation unit 3 is 2 to 10 mm.

[0031] Specifically, the number of the regular hexagon indentation units 3 is 2 to 20.

[0032] Specifically, the indentation failure pressure of the regular hexagon indentation unit 3 is between 0.6 MPa and 1 MPa.

[0033] Furthermore, the tolerance of the failure pressure of each regular hexagon indentation unit 3 at the bottom 2 of the outer shell of the cylindrical battery body 1 is 0.01 to 0.15 MPa.

[0034] Furthermore, the area of the honeycomb-shaped indentations covering the bottom 2 of the outer shell of the cylindrical battery body 1 is at least more than 50%.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cylindrical battery explosion-proof valve, comprising a cylindrical battery body (1), wherein the bottom (2) of the outer shell of the cylindrical battery body (1) is provided with notches, characterized in that: The notches are crisscrossed and connected into a honeycomb shape, forming honeycomb notches; The honeycomb scoring comprises a plurality of regular hexagonal scoring units (3), and the adjacent sides of each adjacent regular hexagonal scoring unit (3) overlap each other and are arranged in a honeycomb shape, thereby forming the honeycomb scoring; the honeycomb scoring covers at least 50% of the area of ​​the bottom (2) of the outer shell of the cylindrical battery body (1); When the cylindrical battery body (1) runs out of control due to overheating, the honeycomb-shaped notches quickly crack and release pressure to the outside in a timely manner.

2. The cylindrical battery explosion-proof valve according to claim 1, characterized in that: The diameter of the bottom (2) of the outer shell of the cylindrical battery body (1) is 18 to 80 mm.

3. The cylindrical battery explosion-proof valve according to claim 1, characterized in that: The side length of the regular hexagonal scoring unit (3) is 2 to 10 mm.

4. The cylindrical battery explosion-proof valve according to claim 3, characterized in that: The number of the regular hexagonal scoring units (3) is 2 to 20.

5. The cylindrical battery explosion-proof valve according to claim 4, characterized in that: The notch breaking pressure of the regular hexagonal notch unit (3) is between 0.6 MPa and 1 MPa.

6. The cylindrical battery explosion-proof valve according to claim 5, characterized in that: The tolerance of the breaking pressure of each regular hexagonal notch unit (3) on the bottom (2) of the outer shell of the cylindrical battery body (1) is 0.01 to 0.15 MPa.

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