Method for detecting dislocation of cathode and anode diaphragms of laminated cells

Abstract

The invention discloses an anode and cathode diaphragm malposition detection method for a lamination cell. The anode and cathode diaphragm malposition detection method for the lamination cell comprises the following steps: 1) irradiating by two-time complementary X-ray light, and calculating the malposition length L and the malposition width W on an anode and cathode diaphragm angular position A by malposition numerical values D1 and D2 measured by two-time irradiation and an angle alpha of incidence; 2) with the same method, measuring the malposition length L' and the malposition width W' of an anode and cathode diaphragm on a cell angular position B to be detected; and 3) comparing the measured L, W, L' and W' with the specified anode and cathode diaphragm malposition specification to judge whether the cell to be detected is a qualified product. According to the anode and cathode diaphragm malposition detection method for the lamination cell, which is disclosed by the invention, a detection method of double angles of incidence and double angular positions, the anode and cathode diaphragm malposition distance of the lamination cell is detected, poor malposition cell erroneous judgment which has big possibility of happening in the traditional single angle detection method and potential safety hazards caused by erroneous judgment can be effectively avoided, and therefore safety risks caused by the insufficient anode and cathode diaphragm malposition of a finished product battery is lowered.

Description

technical field [0001] The invention belongs to the field of non-destructive testing of lithium-ion batteries, and more specifically, the invention relates to a method for accurately detecting the misalignment of cathode and anode diaphragms of laminated batteries. Background technique [0002] With the continuous breakthrough and development of battery technology, lamination technology is gradually favored by users and technicians because of its neat and beautiful appearance, not easy to deform, high energy density, and can be made into any shape. Especially when it is used in some special-shaped spaces, in order to make better use of the space, people hope to make special-shaped batteries that match the shape of the space; because traditional winding batteries cannot be made into special-shaped ones, it is necessary to use laminated sheets technology to meet the above requirements. People's demand for special-shaped batteries requires that the lamination technology must b...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an economical and accurate detection method for the dislocation of cathode and anode diaphragms of laminated batteries, so as to solve and avoid the misjudgment and safety risks caused by the existing detection methods of laminated batteries

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