A leak detection system and method for a lithium battery after liquid injection

Abstract

The invention provides a sealing detection system after liquid injection of a lithium battery. The system comprises a helium detector, a helium detection valve, a vacuum pump, a helium pot, a helium metering pump, a compressed air source and a main pipe. The invention also provides a sealing detection method and method after liquid injection of lithium battery. According to the method, the vacuumpump forms a negative pressure environment outside a liquid injection hole, helium is dissipated in the vacuum environment, and the helium detector detects whether there is helium overflows from the battery to determine the sealing of the battery. A traditional method in which helium is filled into the battery in advance is not used, the needed amount of helium is reduced greatly, and the cost issaved; and the system and method have no influence on the internal of the battery, and the battery quality can be ensured more effectively via lossless detection.

Description

technical field [0001] The present disclosure relates to the technical field of lithium-ion batteries, and in particular to a system and method for detecting the leakiness of a lithium battery after liquid injection. Background technique [0002] After the lithium-ion battery is injected with the electrolyte, sealing and welding operations are required at the injection hole, and then an air-tightness test is performed to prevent the electrolyte from leaking and overflowing, polluting the environment, and at the same time ensure the stable performance of the lithium-ion battery. [0003] At present, the common air tightness testing methods are as follows: 1. Bubble method: Introduce a certain pressure of gas into the sealed workpiece cavity, sink the workpiece into water (or other liquids), or apply soap on the surface of the workpiece Water, observe whether there are bubbles; 2. Pressure drop method: Introduce a certain pressure of gas into the sealed workpiece cavity, stand...

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Problems solved by technology

[0004] If utilize above-mentioned method to carry out the air-tightness detection after lithium battery injection, mainly have following defects: 1, bubble method: can cause battery pollution, inefficiency, can't be automated; 2, pressure drop method, pressure difference method: inefficiency, Low sensitivity; 3. Ultrasonic detection method: poor accuracy; 4. Helium gas leak detection method: it needs to consume a lot of expensive helium gas, and the cost is high, which is not conducive to mass production

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