Topological circuit suitable for accumulator battery all-round property testing

Abstract

The provided technical solution is: it comprises a linearly-regulating current source circuit, a dual-direction variable current voltage source circuit, a battery pack polarity switching circuit and a control circuit; said circuits are series-connected to the battery pack to construct a charging-discharging circuit; said linear regulator is composed of field effect tube Q, and is series-connected in the charging-discharging circuit; its grid electrode is connected to the control circuit. Said battery pack polarity switching circuit is composed of 4 thyristors to form a bridge circuit; the c, d ends of the bridge arm are connected to the battery pack under test; a, b ends are connected in the charging -discharging circuit; the triggering electrodes of said 4 thyristors are connected to the control circuit.

Description

technical field [0001] The invention relates to an improved comprehensive performance test circuit for storage battery packs, which is suitable for comprehensive performance testing of storage battery packs with high voltage, high current and high power, and belongs to the technical field of testing. Background technique [0002] The battery pack comprehensive performance test system is a test system for large-capacity, high-energy-density battery packs and supercapacitor packs (such as power battery packs for electric vehicles, energy storage capacitors in distributed energy systems, and storage battery packs and supercapacitor packs for other industries). It is an important test tool for static properties such as capacity, charge retention capacity, energy density, power density, and cycle life, as well as dynamic properties such as instantaneous limit power, internal resistance, and single-cell voltage consistency. Important equipment affected by the supercapacitor bank. ...

AI Technical Summary

Problems solved by technology

However, due to the extremely small internal resistance of the battery pack, whether the PWM rectifier conversion technology or the traditional thyristor full-control rectifier conversion technology is used, even if the filtering effect of the filter is fully considered, the ripple coefficient on the DC side will still be large, and The filter also reduces the responsiveness of the system

Therefore, it is difficult to directly adopt PWM rectifier conversion technology or thyristor full-control rectifier conversion technology to meet the requirements of small charge and discharge current ripples in the comprehensive performance test of battery packs, which will greatly affect the test results of dynamic performance indicators such as instantaneous limit power. , reducing the credibility of test results

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