Explosion-proof combined cap of high-power battery

Abstract

The invention relates to an explosion-proof combined cap of a high-power battery, which is composed of a steel cap (11), an explosion-proof plate (12), a connecting plate (13), a spacing ring (14) and sealing rings (15), wherein the outer circumferences of the steel cap (11), the explosion-proof plate (12), the connecting plate (13) and the spacing ring (14) are covered with the sealing rings (15); and the surface of the explosion-proof plate (12) is provided with a nickel plating layer (121), and the steel cap (11) and the explosion-proof plate (12) are welded by way of tin soldering. The explosion-proof combined cap of the invention can guarantee the low resistivity / consumption and high-power through-current capabilities of the battery when the battery runs normally; and when the battery runs exceptionally, the inner part of the battery can be disconnected reliably, therefore, the security protection function of the explosion-proof combined cap is played more effectively.

Description

technical field [0001] The invention relates to a high-power power battery, in particular to an explosion-proof combination cap of an ultra-low resistance high-power cylindrical power battery. Background technique [0002] In the prior art, there are usually three connection modes between the explosion-proof disk (aluminum) and the nickel-plated steel cap included in the combined cap for cylindrical batteries. The first is to add a nickel sheet or copper sheet between the explosion-proof disc and the nickel-plated steel cap. The disadvantages are high cost, large resistance and instability (1-3mΩ). The second connection method is to use laser spot welding connection. Its disadvantages include: the welding strength of laser spot welding connection is not high; the resistance of the welding place is generally 0.5mΩ, and the deformation after sealing will cause the resistance value to change; After a large current passes through the explosion-proof disk, the aluminum surface w...

AI Technical Summary

Problems solved by technology

The first is to add a nickel sheet or copper sheet between the explosion-proof disc and the nickel-plated steel cap. The disadvantages are high cost, large resistance and instability (1~3mΩ)

The second connection method is to use laser spot welding connection. Its disadvantages include: the welding strength of laser spot welding connection is not high; the resistance of the welding place is generally 0.5mΩ, and the deformation after sealing will cause the resistance value to change; After a large current passes through the explosion-proof disk, the aluminum surface will be oxidized, which will increase the contact resistance and affect the flow capacity; the surface of the nickel-plated steel cap will damage the nickel-plated layer due to laser welding spots, resulting in a decrease in anti-rust ability, thereby affecting the reliability of later use. sex

The third connection method is to use ultrasonic or resistance welding connection. Its disadvantages include: because the surface is damaged during ultrasonic welding, the burrs on the surface will cause a short circuit when the battery is sealed, and the control is difficult; the welding firmness is not good. And the resistance value is too large

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