Rapid analysis method of shell resistor defective product

Abstract

The invention provides a rapid analysis method for a shell resistor defective product, and the method comprises the following steps: 1), carrying out the online insulation testing of a battery, and recognizing and automatically rejecting the shell resistor defective product; 2) confirming the insulation resistance value of the shell resistor defective product; 3) carrying out insulation test retest on the shell resistance defective product through an offline insulation tester; 4) establishing an electronic conduction loop between a negative tab metal belt and an aluminum-plastic film aluminumlayer of the shell resistor defective product, and performing charging and discharging circulation on the shell resistor defective product by using charging and discharging equipment until the shell resistor defective product is corroded; and 5) dismounting and analyzing the shell resistor defective product. According to the method, through charging and discharging circulation, the corrosion phenomenon of the aluminum-plastic film of the battery with the shell resistor defective product is promoted in a short time, the internal state of the position of a corrosion point is confirmed through disassembling, the cause of the shell resistor defective product can be rapidly locked, and therefore the activity is rapidly guided and improved.

Description

technical field [0001] The invention belongs to the technical field of battery failure analysis, in particular to a rapid analysis method for shell resistance failure. Background technique [0002] Lithium-ion soft-pack batteries have the advantages of good safety performance, light weight, high capacity, high energy density, low internal resistance, and flexible design. With the explosive development of new energy vehicles, as well as new energy vehicles' demand for power battery energy density and policy-driven, soft-pack power batteries have rapidly developed and been applied in the field of new energy vehicles by virtue of their own advantages of high energy density and high safety. The market share of soft-pack power batteries continues to rise. [0003] Lithium-ion soft-pack power batteries are packaged in aluminum-plastic film. The thickness of the aluminum-plastic film is generally 153 μm, and the composite material is mainly composed of ON / AL / CPP (outer nylon layer...

AI Technical Summary

Problems solved by technology

This method takes a long time, usually at least 1 week or more, and most of the bad shell resistors have a long time to corrode the aluminum-plastic film, so they cannot show abnormal phenomena in a short period of time, and cannot quickly provide guidance for improvement activities. Leading to the occurrence of persistent shell resistor bad products, the product qualification rate and equipment utilization rate are greatly reduced

Images