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Method for detecting welding firmness of lithium ion battery tab

A lithium-ion battery and tab welding technology, applied in the direction of material resistance, can solve the problems that cannot guarantee the objectivity and scientificity of the pulling force value, hidden dangers of lithium battery quality, unfavorable inspection and analysis, etc., and achieve the effect of improving the control rate of defective products

Active Publication Date: 2013-10-30
SUZHOU GCL ENERGY TECH DEV CO LTD
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AI Technical Summary

Problems solved by technology

The above inspection methods cannot guarantee the objectivity and scientificity of the pulling force value, and are not conducive to inspection and analysis; moreover, some destructive inspection methods cannot be used in batches during the production process, so the inability to batch inspection also affects the use of lithium batteries. Buried quality hidden danger

Method used

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  • Method for detecting welding firmness of lithium ion battery tab
  • Method for detecting welding firmness of lithium ion battery tab
  • Method for detecting welding firmness of lithium ion battery tab

Examples

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Embodiment 1

[0027] The working principle of the tab welding machine is: use high-frequency vibration waves to transmit to two metal surfaces to be welded, and under pressure, make the two metal surfaces rub against each other to form fusion between molecular layers. And the point where each substrate sheet and the ear strap are fused has its own impedance. And the impedance distribution of each fusion point after welding is relatively consistent: generally, the welding impedance of the positive and negative base materials and the positive and negative ear straps is 3±0.15mΩ.

[0028] This embodiment provides a method for detecting the welding firmness of the tabs of lithium-ion batteries. The method uses a DC internal resistance meter to test the impedance of the fusion point of the substrate sheet and the tab strap, and according to the reference experience value of the fusion point of the positive and negative electrodes Do delete selection, if the value is within the reference value ra...

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Abstract

The invention provides a method for detecting the welding firmness of a lithium ion battery tab. The method comprises the following steps of step1, sampling partial battery tab welding products in the mass production to be tested, obtaining a firm welding point resistance value and a desoldering welding point resistance value, carrying out the F-test and t-test for the firm welding point resistance value and the desoldering welding point resistance value, and acquiring a test verification result; step 3, if the F-test verification result shows that a standard deviation has remarkable difference, determining that partial battery tab welding products are unqualified; if the F-test verification result shows that the standard deviation has no difference, but t-test verification result shows that the average deviation has remarkable difference, determining that partial battery tab welding products are unqualified; if both the F-test verification result and the t-test verification result shows no difference, determining that the battery tab welding products are qualified. By adopting the method, the mass detection for the welding firmness of the tab can be realized without damage, and the control rate of defective products can be increased.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery detection, relates to a detection method, in particular to a method for detecting the welding firmness of tabs of lithium ion batteries. Background technique [0002] In recent years, with the depletion of the world's oil resources, the power source of the car will have to get rid of the shackles of oil and use some new energy, which will directly promote a major technological revolution in the auto industry, and the development of new energy vehicles instead of traditional cars trend becomes inevitable. As the "heart" of new energy vehicles, power lithium batteries are particularly important in terms of performance and safety. Lithium-ion batteries are connected in series by positive and negative welding to form a circuit, and the firmness of the welding is one of the main factors affecting the life and performance of lithium-ion batteries. [0003] The welding form of lithium-ion b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04
Inventor 李菊香吴俊毅
Owner SUZHOU GCL ENERGY TECH DEV CO LTD
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