Inspection method for spot welding missing of small power battery

By performing short-term discharge detection on the battery cells after spot welding of small power batteries, the battery module's own measurement lines are used to record the voltage of each series of battery cells, the complex and destructive problems in the existing technology are solved, and rapid and safe missed welding detection is achieved.

CN119716596APending Publication Date: 2025-03-28天津仁爱学院
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Patent Information

Application Number
CN202411819164.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-11
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The prior art is difficult to accurately detect the spot welding and leakage problem of small power batteries, and the detection method is complex and destructive, affecting the service life and safety performance of the battery.

Method used

By connecting the battery cells after spot welding of the small power battery in series and parallel, connecting them with the voltage measuring equipment using the measurement line provided by the battery module, recording the voltage of each battery cell after a short time discharge, calculating the voltage average and difference value, and determining whether there is any missing welding.

Benefits of technology

The spot welding and leakage detection of small power batteries without full charge and discharge test is achieved, eliminating the impact of ambient temperature and charge state, short detection time, low energy consumption, small equipment investment, and safe and fast.

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Abstract

The invention belongs to the technical field of batteries, and particularly relates to a detection method for spot welding missing of a small power battery. The inspection method for the spot welding missing of the small power battery comprises the following steps that the series connection number of battery modules is S, the parallel connection number is P, and the upper limit internal resistance of an internal resistance interval of a battery cell is Rmax; the battery module is welded with a measuring flat cable; the battery module is connected with voltage measuring equipment by using the terminal of the measuring flat cable; discharging the battery module for 10-30 seconds at the current I, recording the voltage Vi (i = 1, 2... S) of each string of battery cells at the discharge tail end, and calculating the average value Vflat of the voltage of each string of battery cells; and calculating Vi-V flat, and if the following relational expression is established: # imgabs0 #, determining that the ith string has the solder skipping problem. According to the inspection method for spot welding and missing welding of the small power battery, the battery does not need to be subjected to full-charge and full-discharge testing, and the influence of factors such as the environment temperature and the battery charge state is eliminated.
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