Battery cell welding detection method and device and battery cell manufacturing method

Through the comparison and analysis of capacitance measurement values, the problem that cell welding quality inspection in the existing technology relies on manual visual inspection, and the effective detection of cell false welding and missing welding is achieved, ensuring the safety performance and product performance of the cell .

CN119247162APending Publication Date: 2025-01-03BEIJING CHEHEJIA AUTOMOBILE TECH CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202310806992.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-07-03
Publication Date
2025-01-03

AI Technical Summary

Technical Problem

In the prior art, cell welding quality inspection relies on manual visual inspection, and the battery cell connection cannot be effectively identified, resulting in the inability to effectively identify false welding and missing welding, affecting the battery cell safety performance and product performance.

Method used

By obtaining the measured value of the battery cell capacitance after discharge, comparing with the preset threshold, determining whether there is any false welding and missing welding, using the absolute value and integer multiple of the difference between the capacitor measurement value and the threshold, the number or number of false welding and missing welding layers are calculated by calculating the absolute value or number of false welding and missing welding layers. , realize online detection.

Benefits of technology

The screening of process abnormal problems such as false welding and missing welding during cell welding is realized, avoiding the outflow of traditional artificial visual inspection defective products, and 100% online inspection is achieved.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN119247162A_ABST
    Figure CN119247162A_ABST
Patent Text Reader

Abstract

The invention discloses a battery cell welding detection method and device and a battery cell manufacturing method. The battery cell welding detection method comprises the steps that capacitance measurement values of one or more discharged battery cells are obtained, each battery cell comprises one or more layers of pole piece combinations, each pole piece combination comprises two pole pieces equivalent to an equivalent capacitor, and the capacitance measurement values are obtained through measurement of electrical elements connected with the pole pieces; the capacitance measurement value is compared with a preset first threshold value, when the capacitance measurement value is smaller than the preset first threshold value, the absolute value of the difference value between the capacitance measurement value and the preset first threshold value is calculated, according to the comparison result of the absolute value of the difference value and the integral multiple of a preset second threshold value, whether pseudo soldering and solder skips exist or not is judged, and the first threshold value is the integral multiple of the second threshold value. According to the battery cell welding detection method, the capacitance measurement value is compared with the preset first threshold value to judge whether pseudo soldering and solder skips exist or not, so that screening of battery cells with process abnormality problems such as pseudo soldering and solder skips in the welding process is achieved.
Need to check novelty before this filing date? Find Prior Art