A kind of top cover for power battery with aluminum shell

Abstract

The invention belongs to the technical field of power batteries, and in particular relates to a top cover for an aluminum shell power battery, which includes a top cover sheet, and the top cover sheet is provided with two electrode introduction holes, and the two electrode introduction holes are respectively connected with a negative pole pole structure and a Positive pole structure. The positive pole structure includes a positive pole and a high temperature resistance. The positive pole passes through the electrode introduction hole and is insulated and connected to the top cover. The positive pole and the top cover are also electrically connected through a high temperature resistance. The resistance value of the high temperature resistor is 10~1000 ohms. Compared with the prior art, the present invention realizes conduction between the positive pole and the aluminum shell by electrically connecting the high-temperature resistant resistor between the positive pole and the top cover sheet, ensures that the potential of the aluminum shell and the positive pole is consistent, and can effectively prevent aluminum Shell corrosion; on the other hand, it solves the safety hazard of the existing technology under high temperature conditions, making the aluminum shell battery have good safety performance even under abuse conditions such as extrusion, nail penetration, and overcharging.

Description

technical field [0001] The invention belongs to the technical field of power batteries, and in particular relates to a top cover for an aluminum case power battery. Background technique [0002] With the development of modern society and the enhancement of people's awareness of environmental protection, more and more devices choose to use lithium batteries as power sources, such as mobile phones, notebook computers, power tools and electric vehicles, etc., which provides a great opportunity for the application and development of lithium batteries wide open space. Among them, lithium batteries used in electric tools and electric vehicles are generally called power batteries. [0003] Aluminum shells are widely used in power batteries due to their low cost, light weight, and good heat dissipation. However, due to the potential difference between the potential of aluminum and the potential of the positive electrode of the battery, it will cause corrosion of the aluminum shell...

AI Technical Summary

Problems solved by technology

If metal is used for direct conduction, since its resistance is generally at the milliohm level, when the battery is short-circuited, its loop current is very large, which is prone to sparking and causing safety hazards such as fire.

[0004] The Chinese invention patent application with the publication number CN100592566C discloses a method of connecting conductive plastic between the positive pole and the top cover sheet to increase the resistance. Nails and overcharge, etc.) under the test environment, the surface temperature of the battery core will reach above 250°C, the above high temperature is enough to melt the polyethylene material in the conductive plastic, resulting in the occurrence of secondary safety hazards; moreover, the polyethylene material itself is easy to age, In the long-term use process, after repeated heating and cooling, it is easy to crack and fall off, thus affecting the stability of the entire structure; There will also be softening or even melting, which cannot be recycled

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