Leakage detection method and device for peripheral welding of lithium-ion battery

Abstract

The invention relates to a leakage detection method and device for peripheral welding of a lithium-ion battery. The method comprises the steps of: placing a battery to be detected in a sealed chamber isolated from the outside, to enable an liquid injection port of the battery to be detected to be communicated with the outside air and isolated from the sealed chamber; using a vacuum tester to vacuumize the sealed chamber, and detecting the pressure change in the sealed chamber; according to the pressure change in the sealed chamber, judging the conditions of the peripheral welding of the battery to be detected. On the one hand, the leakage detection method can eliminate the influence of the internal material of the battery and the processing method on test results, reduce gas equilibration time, and reduce the inflation time, thereby improving the test accuracy and the test efficiency; and on the other hand, the leakage detection method can eliminate the influence of the leakage of vacuum tester, test system, detection port, pipeline, and the like, on the test results, thereby further improving the test accuracy.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery manufacturing, and in particular relates to a method and device for detecting leakage of lithium-ion battery peripheral welding. Background technique [0002] With the global energy crisis and environmental pollution becoming more and more serious, the search for green and sustainable new energy has become the development direction of the energy field. Large-capacity lithium-ion power batteries have become one of the green new energy sources that have attracted much attention due to their high energy density, long cycle life, green and pollution-free. [0003] However, the safety of large-capacity lithium-ion power batteries has always been the main problem restricting its development. In particular, the sealing of the battery's peripheral welding has a profound impact on the safety of the battery. Poor peripheral welding of the battery is prone to various quality problems, such as In...

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Problems solved by technology

[0004] Due to the influence of various materials and processing methods of the battery, such as different separator materials, different positive and negative electrode materials, different cell methods (winding or lamination), and different electrode rolling densities; currently The high-capacity lithium-ion power battery welding leak detection device has great defects in test accuracy, which often causes unqualified products to flow into subsequent orders, and even flow into customers

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