Short-circuit test circuit, tester and method for negative electrode protection type lithium battery protection board

Abstract

The invention is suitable for the technical field of lithium battery product testing, and provides a short-circuit test circuit, a tester and a method for a negative electrode protection type lithiumbattery protection board. The short-circuit test circuit comprises a short-circuit starting switch tube assembly, a capacitor assembly, an air switch group, an indication unit capable of being manually switched on and off, a controller and a level conversion circuit. The capacitor assembly comprises a plurality of high-capacity capacitors which can be independently controlled to be switched on; the pulse width of the pulse driving signal output by the controller can also be set; different short-circuit test thresholds are realized by controlling the specific capacity of the switched-on high-capacity capacitor or the pulse width of the pulse driving signal; and whether the short-circuit protection function of the battery protection board is effective or not is judged by combining the stateindication of the prompt unit, and the short-circuit test threshold can be adjusted from low to high, so that the risk of burning the battery protection board and the battery pack during direct high-threshold test short circuit is avoided.

Description

technical field [0001] The invention belongs to the technical field of lithium battery product testing, and in particular relates to a short-circuit test circuit, tester and method for a negative electrode protection type lithium battery protection board. Background technique [0002] Lithium battery products with protection circuits have protection functions such as overcharge, overdischarge, overcurrent, overtemperature and short circuit. When testing their basic functions, overcharge, overdischarge, overcurrent and overtemperature can be tested using electronic Load meter, DC power supply and constant temperature box are used for testing, and there are generally several methods for short-circuit testing: one is to directly short-circuit the output, the other is to use the short-circuit function of the load meter, and the third is to use an air switch. The first and second methods are basically the same way. During product development, it is necessary to test whether the s...

AI Technical Summary

Problems solved by technology

The first and second methods are basically the same way. During product development, it is necessary to test whether the short-circuit parameters of the battery protection board are adjusted correctly. If the short-circuit parameters are not adjusted correctly, the short-circuit function of the protection board will fail or the test will It has not reached its protection threshold. In this case, the protection board and battery will be burned if these three methods are tested, and the safety of personnel will be endangered in severe cases.

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