Detection method for detecting false welding of electric core tab

Abstract

The invention provides a detection method for detecting the false welding of an electric core tab. The method comprises the steps of 1) respectively contacting the positive and negative probes of a battery tester with weldmasks on the two sides of the positive / negative tab of an electrical core so as to obtain the test internal resistance value of the positive / negative tab of the electrical core;2) comparing the test internal resistance value of the positive / negative tab of the electrical core with a standard internal resistance value; if the test internal resistance value of the positive / negative tab of the electrical core is smaller than or equal to the standard internal resistance value, judging that the positive / negative tab of the electrical core is qualified. According to the methodfor detecting the false welding of the electric core tab, the test internal resistance value of the positive / negative tab of the electrical core is compared with the standard internal resistance value, and then whether the positive / negative tab of the electrical core is qualified or not can be judged. The detection process is simple and convenient. Meanwhile, the full inspection of electrical core tabs can be realized. Test results can be fed back in time. Meanwhile, test samples are prevented from being damaged.

Description

technical field [0001] The invention relates to the field of detection equipment for battery tabs, in particular to a method for detecting false welding of battery tabs. Background technique [0002] During the package welding process of the battery assembly group, there are often cases of poor welding of the positive / negative side tabs of the battery core, that is, false welding. Because the welding strength of the positive / negative side tabs of the battery core is random inspection work, there are occasional false welded cells. Flowing into the forming process of the battery cell causes the internal resistance to be too large and is scrapped. [0003] The existing detection of the welding strength of the tabs of the battery cell is usually judged by the tensile test, and the tensile test has the following problems: 1. Poor timeliness: the test result cannot be fed back in time, and usually some products have been produced when an abnormality is found, resulting in the scra...

AI Technical Summary

Problems solved by technology

[0002] During the package welding process of the battery assembly group, there are often cases of poor welding of the positive / negative side tabs of the battery core, that is, false welding. Because the welding strength of the positive / negative side tabs of the battery core is random inspection work, there are occasional false welded cells. Flowing into the formation process of the battery cell, causing the internal resistance to be too large and scrapped

[0003] The existing detection of the welding strength of the tabs of the battery cell is usually judged by the tensile test, and the tensile test has the following problems: 1. Poor timeliness: the test result cannot be fed back in time, and usually some products have been produced when an abnormality is found, resulting in the scrapping of the product; 2. .Destructive: the tensile test requires dismantling the cell, so the tensile test is a destructive test, and the test sample is usually scrapped; 3. There are limitations: due to the long test time and the destructive test, it is not possible to fully inspect the cell Welding strength of tabs on the positive / negative side can only be inspected randomly, and there are certain limitations

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