A welding process method and device for a power battery cell

Abstract

The invention discloses a welding process method for a power battery cell, which includes battery cell assembly, tab bending and bonding and pressing, double-side laser welding, and electrical connection sheet bending and positioning. The invention also discloses a welding device for a power battery unit, which includes a cover plate, a clamping fixture, a lug pressure plate, a lug bending fixture, a rotary welding fixture, and an electrical connecting piece bending fixture. In the present invention, the whole welding process is a semi-automatic operation, which is completed by operating the button to control the hydraulic drive mechanism. The precise cooperation between them ultimately guarantees the quality of single laser welding and process consistency, and can effectively improve production efficiency, control safety risks and reduce costs in the process of small-batch production or trial production of battery modules.

Description

Technical field [0001] The invention belongs to the technical field of laser welding process design and welding fixture design for power battery monomers, and specifically relates to a welding process method and device for small batch production or trial production of soft pack power battery modules. Background technique [0002] The current mainstream power battery cell types are divided into soft packs, square hard shells and cylinders. Among them, the square hard shell batteries and cylindrical batteries have sufficient strength and structural strength and are easy to fix, and only need to add electrical connections for welding or screwing. To realize the series and parallel connection between the cells, it is relatively easy to realize. The soft package monomer is limited by factors such as difficult positioning due to shape and structure, soft and outward extension of the positive and negative poles, and uneven position distribution. In terms of welding method, welding proce...

AI Technical Summary

Problems solved by technology

The soft package monomer is limited by factors such as shape and structure, difficulty in positioning, soft and outwardly elongated positive and negative electrodes, and uneven position distribution. In terms of welding methods, welding processes, welding efficiency, and welding quality control, etc. There are certain technical difficulties

Therefore, at present, the products of domestic mainstream battery manufacturers are mostly in the form of square hard shells, and the form of soft packs is rarely used.

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