Power battery precise welding method and device

Abstract

The invention discloses a power battery precise welding device. The device comprises a rack, and further comprises two shifting mechanisms, two welding fixtures, two distance measuring modules and twowelding modules, wherein the two shifting mechanisms are movably mounted on the rack, and can be alternately positioned at a welding station and a discharging station; the two welding fixtures are installed on the two shifting mechanisms correspondingly and used for power battery clamping and positioning; the two distance measuring modules are installed on the two welding fixtures correspondinglyand used for measuring the distances between the distance measuring modules and the end faces of a power battery clamped in the welding fixtures; and the two welding modules are installed on the twosides of the shifting mechanisms correspondingly and carry out welding on the power battery in the welding fixtures simultaneously according to the measurement values of the distance measuring modules. A power battery precise welding method is also disclosed. According to the welding device and the welding method, a shell with low manufacturing precision and large self-deformation can be accurately positioned, and effective inspection and elimination of defective products after welding can be realized.

Description

technical field [0001] The invention relates to battery welding technology, in particular to a precise welding method and device for power batteries, which are suitable for pre-spot welding of both side cover plates of square batteries. Background technique [0002] With the maturity and improvement of electric vehicle technology, electric vehicles and hybrid vehicles have gradually entered daily life, and their widespread popularization has given birth to huge business opportunities. However, due to the complex use environment, the safety performance requirements of the battery are extremely strict, and the performance of the power battery itself directly affects the overall performance of the electric vehicle. Among them, battery welding is an extremely critical link in the production and manufacture of power batteries. [0003] At present, for prismatic batteries that need to be welded on both sides of the cover plate, the industry usually divides the welding of the cove...

AI Technical Summary

Problems solved by technology

[0004] However, in the laser spot welding process, the assembly accuracy is high, and the pressing gap between the cover plate and the shell needs to be small (within 0.1mm), so the control is difficult; at the same time, the battery shell is getting thinner and thinner, and its own deformation is large. Manufacturing dimensional errors are large, so high-precision welding fixtures are required to ensure the yield rate and welding efficiency during batch welding

[0005] In addition, the existing detection methods cannot meet the actual production needs and cannot effectively inspect defective products

For example, CCD visual recognition is greatly affected by factors such as environmental light source, battery case surface finish, scratches, etc., which can easily lead to false recognition, and the pixel requirements are high and the cost is high.

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