Battery protection circuit, testing device and method for battery protection circuit

Abstract

The invention provides a testing device of a battery protection circuit, the battery protection circuit comprises a battery voltage detection unit for sending a protection trigger signal when detecting that the Vcc voltage of a power port reaches a preset protection threshold; and a control unit for generating an impedance regulation signal according to the protection trigger signal, and the impedance regulation signal is used for regulating the impedance between the power port in a drive unit and a charge protection execution end Cout or a discharge protection execution end Dout. The testing device comprises a calculation unit for calculating the voltage difference between the power port and the charge protection execution end Cout or the discharge protection execution end Dout; and a comparison unit for comparing the voltage difference calculated at this time with the voltage difference calculated at the last time, if the comparison result exceeds the preset difference value, then test feedback information is output. The invention can simplify the test operation and reduce the test time on the basis of not affecting the normal use of the circuit.

Description

Technical field [0001] The invention relates to the field of circuit design, in particular to a battery protection circuit, a battery protection circuit test device and a battery protection circuit test method. Background technique [0002] During normal use of batteries (such as lithium-ion batteries), the internal chemical positive reaction of the mutual conversion of electric energy and chemical energy, but under certain conditions, such as overcharging and overdischarging will cause chemical reactions in the battery. After the side reaction is intensified, it will seriously affect the performance and service life of the battery, and may produce a large amount of gas, which will cause the internal pressure of the battery to rapidly increase and then explode, causing safety problems. Therefore, it is necessary to configure a protection circuit for the battery. The charging and discharging status of the battery is effectively monitored, and the charging and discharging circuit i...

AI Technical Summary

Problems solved by technology

When testing the threshold voltage of overcharge protection or threshold voltage of overdischarge protection, it is necessary to truly simulate the delay operation of the external capacitor. In practice, the delay operation of overcharge protection is on the order of seconds. The delay operation of discharge protection is on the order of tens to hundreds of milliseconds, which not only increases the difficulty of testing but also increases the testing time

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