Detection method of aluminum plastic film for lithium ion battery

Abstract

The invention discloses a detection method for an aluminum-plastic film for a lithium ion battery. Step 1: injecting a dilute sulfuric acid solution into the aluminum-plastic film, pumping and sealing the aluminum-plastic film injected with the dilute sulfuric acid solution; step 2: adding the step 1. The sealed aluminum-plastic film is put into an oven for heating, and after the heating is completed, the aluminum-plastic film is disassembled for identification; the beneficial effects of the present invention are: by injecting the aluminum-plastic film into the sulfuric acid solution for encapsulation and heating, the detection method is simple, the detection cost is low, and the method Flexible, if the detection rate needs to be increased, the concentration of the injected sulfuric acid solution can be increased, and the damaged position of the aluminum-plastic film can be found quickly and accurately.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a detection method for aluminum-plastic films used in lithium-ion batteries. Background technique [0002] Among them, aluminum-plastic film, as one of the raw materials for soft-pack batteries, is a must-check item for battery factories. Aluminum plastic film usually consists of outer nylon layer, middle aluminum layer and inner PP layer. The outermost layer of nylon has the function of anti-wear, the middle aluminum layer plays the role of isolating air and moisture, and the inner PP layer plays the role of isolating electrolyte corrosion and fusion sealing. In the aluminum-plastic film production process, transportation process or mold punching process, it is easy to [0003] The PP layer of the aluminum-plastic film is damaged, so that the electrolyte and the aluminum layer are corroded by contact and lead to excessive internal resistance, battery gas, aluminum-pl...

AI Technical Summary

Problems solved by technology

In the aluminum-plastic film production process, transportation process or mold punching process, it is easy to

[0003] The PP layer of the aluminum-plastic film is damaged, so that the electrolyte and the aluminum layer are contacted and corroded, resulting in excessive internal resistance, battery gas, aluminum-plastic film delamination, and even rupture and leakage.

[0004] At present, there i