Method capable of separating bad electric core(s) in laser welding module

Abstract

The present invention discloses a method capable of separating bad electric core(s) in a laser welding module. According to the method, by disassembling a battery module at a relatively low temperature, and using the principle that the activity of chemical substances in a battery is decreased at the low temperature, the bad electric core(s) in the module are disassembled by means of cutting, corrosion and fracturing, so that the good electric core(s) in the battery module are recovered, and the good electric core(s) are utilized in echelon.

Description

Technical field [0001] The invention relates to the field of lithium-ion battery recycling and echelon utilization, in particular to a method for separating defective cells in a laser welding battery module. Background technique [0002] With my country's vigorous promotion of new energy electric vehicles, the power battery market has shown a rapid growth trend, and power battery manufacturers have expanded their production capacity in recent years. At the same time, with the massive increase in demand for power batteries, the amount of scrapped power batteries is also increasing. For example, the total output of lithium batteries in China in 2015 was 47.13Gwh, of which power battery output was 16.9Gwh, accounting for 36.07%; the output of consumer lithium batteries was 23.69Gwh, accounting for 50.26%, and the output of energy storage lithium batteries was 1.73Gwh, accounting for Than 3.67%. According to the "Research Report on Power Lithium Battery Recycling Industry" released...

AI Technical Summary

Problems solved by technology

In the current power battery assembly, in order to reduce system heat and simplify the assembly process, laser welding technology is widely used at present, and in the battery modules with problems, the problem is often only individual parallel cells, most of which are still in the It is in good condition, but laser welding is difficult to dismantle. Removing a parallel battery pack will often cause irreparable damage to the busbar and other electrical connections of the entire module. This is a great deal for premium batteries. waste of

Moreover, even if the battery module discharges most of the power, the remaining energy voltage and power are still very large. Directly tearing down the entire battery module will easily cause damage to the good cells around the problematic battery, which in turn will lead to the completion of cascade utilization. A new imbalance occurs in the battery module as a whole. In addition, the danger of direct demolition is very high, which is likely to pose a serious threat to the personal safety of operators and equipment.