Method for rapidly judging poor insulation of soft package lithium ion battery aluminium-plastic film

Abstract

The invention discloses a method for rapidly judging poor insulation of a soft package lithium ion battery aluminium-plastic film. The method comprises the following steps: 1) enabling a probe to be pierced into any seal edge of a soft package lithium ion battery to enable the probe to make contact with an aluminium layer of the aluminium-plastic film, and then, enabling the probe and the positive electrode lug or negative electrode lug of the soft package lithium ion battery to be connected with the two electrodes of an adjustable voltage DC power source through wires respectively, wherein the voltage of the adjustable voltage DC power source is equal to or larger than 400V; and 2) starting the power source, if the seal edge of the soft package lithium ion battery has liquid leakage, breakdown or smoking phenomenon, judging that the aluminium-plastic film insulation is poor at the seal edge place; and if the seal edge of the soft package lithium ion battery does not have liquid leakage, breakdown or smoking phenomenon, judging that the aluminium-plastic film insulation at the seal edge of the soft package lithium ion battery is good. With the method, the insulation state of the soft package lithium ion battery can he judged quickly, and meanwhile, the specific position of microdefect in the aluminum-plastic film can be determined, so that technicists are allowed to carry out optimization adjustment on the operation state of heat-seal equipment or heat-seal parameters in time conveniently.

Description

technical field [0001] The invention relates to the technical field of detection of lithium-ion batteries, in particular to a method for quickly judging the poor insulation of the aluminum-plastic film of a soft-pack lithium-ion battery. [0002] Background technique [0003] The laminated battery in the soft-pack lithium-ion battery needs to use aluminum-plastic film as the packaging film to package the bare cell. During the packaging process, the tab side is first heat-sealed, and then the side and bottom are heat-sealed. Therefore, the aluminum-plastic film forms an airtight packaging body, so the heat-sealing quality of the aluminum-plastic film is crucial to the safety of the battery. [0004] At present, the most conventional method to test the heat sealing quality of aluminum-plastic film is to test the thickness of aluminum-plastic film edge sealing and heat-sealing tensile strength, but in the actual production process, there are often indicators such as aluminum-p...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the aluminum-plastic film detection method in the prior art cannot quickly detect the heat-sealing effect of the aluminum-plastic film, the detection period is long, and the specific location where the aluminum-plastic film is corroded cannot be determined, which is not conducive for technicians to timely check the heat-sealing parameters. Or the problem of optimizing and adjusting the operating conditions of heat-sealing equipment provides a method for quickly judging the poor insulation of the aluminum-plastic film of the soft-packed lithium-ion battery. The insulation state can be judged, and the specific position of the microscopic defects existing in the aluminum-plastic film can be determined at the same time, which is beneficial for technicians to optimize and adjust the heat-sealing parameters or the operation status of the heat-sealing equipment in time, so as to ensure the stability of product quality

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