Battery sealing performance testing method
A sealing detection and battery technology, applied in fluid tightness testing, using liquid/vacuum degree for liquid tightness measurement, detecting the appearance of fluid at the leakage point, etc., can solve the problem of sealing ball and battery cover sealing cooperation Bad welding, bad welding of impurities on the battery surface, insufficient ball smashing pressure, etc., to achieve the effects of improved work efficiency, efficient inspection, and process stability
Inactive Publication Date: 2015-06-24
TIANJIN LISHEN BATTERY
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Problems solved by technology
[0004] At present, the sealing methods of square aluminum case power batteries mainly include ball-smashing sealing and laser welding PIN. However, these two sealing methods have their own shortcomings. Insufficient ball smashing pressure causes poor battery sealing, laser welding PIN is easy to cause poor welding due to impurities on the battery surface
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[0016] Below, the substantive features and advantages of the present invention will be further described in conjunction with examples, but the present invention is not limited to the listed examples.
[0017] See figure 1 , a method for testing the sealing performance of a battery, first putting the sealed battery 4 upside down into the battery storage box 1, the bottom of the storage box is placed with blotting paper (not shown), and then the battery storage box 1 Put it into the cavity of the vacuum box together with the battery, start the vacuum pump for vacuuming, stop vacuuming when the vacuum degree in the cavity of the vacuum box reaches the set value, and perform negative pressure processing, and turn on the vacuum after maintaining the negative pressure for a period of time Use the weight loss method and / or check the state of the absorbent paper to determine whether the battery has seal leakage.
[0018] It should be noted that putting the sealed battery upside down ...
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The invention relates to a battery sealing performance testing method. The method comprises the steps of placing a sealed battery into a battery containing box inversely, wherein liquid absorption paper is placed on the bottom of the containing box; placing the battery containing box into a cavity of a vacuum box together with the battery and starting a vacuum pump for vacummizing; stopping vacuumizing when the vacuum degree in the cavity of the vacuum box reaches a preset value, and conducting negative pressure maintenance; opening the vacuum box after negative pressure maintenance is conducted for a period of time, and judging whether leakage occurs with the weight loss method and / or by detecting the state of the liquid absorption paper. The method can effectively detect batteries with poor sealing performance or leakage, operation is easy and stable, working efficiency is improved greatly, and requirements for large-scale industrial production are met.
Description
technical field [0001] The invention belongs to the technical field of detection of lithium-ion power batteries, and in particular relates to a method for detecting the sealing performance of lithium-ion power batteries. Background technique [0002] With the development of modern society and the enhancement of people's awareness of environmental protection, more and more devices choose to use rechargeable secondary batteries as power sources, such as mobile phones, laptop computers, power tools and electric vehicles, etc. The application and development of secondary batteries provide a broad space. [0003] The electrolyte is an important part of the battery, which is responsible for the transmission of ions between the positive and negative electrodes through the interior of the battery. It has an important impact on the capacity, operating temperature range, cycle performance and safety performance of the battery. [0004] At present, the sealing methods of square alumin...
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IPC IPC(8): G01M3/00G01M3/04
Inventor 张火成张娜李杨王永武郭玉彬
Owner TIANJIN LISHEN BATTERY