Storage battery residual capacity and health state rapid detection method and device

Abstract

The invention provides a storage battery residual capacity and health state rapid detection method and device. The method comprises the following steps of: enabling a storage battery to carry out instant larger current discharging through a controllable discharge circuit, monitoring the discharging current in the discharging circuit in the process by a current sampling circuit, synchronously monitoring the end voltage of the storage battery through a voltage sampling circuit, and utilizing a direct current discharge method to measure the internal resistance of the storage battery, wherein the discharge circuit and the voltage sampling circuit are connected in parallel with two wiring columns of the storage battery, so that the internal resistance of the storage battery is measured according to a Kelvin four-wire system measuring method, and the maximum discharge current, the load voltage and the internal resistance data of the storage battery are obtained; and according to an associated relation model, calculating SOC and SOH of the storage battery. By adopting the method provided by the invention, the residual capacity and the health state of the storage battery can be accurately detected on line.

Description

technical field [0001] The invention relates to a method for detecting the remaining capacity of a battery, and a method for evaluating the health state of the battery based on the method for detecting the remaining capacity. In addition, the invention also relates to a device for quickly detecting the remaining capacity and the health state of the battery. Background technique [0002] Lead-acid batteries are widely used in many fields, such as automobiles, communications, electric power, medical, military, ships, etc., due to their mature technology, low cost, large current discharge, large capacity, and reliable performance. Under long-term use of lead-acid batteries, there will inevitably be loss problems such as battery deterioration and aging. If a lossy battery is used in series with a good battery for a long time, it will not only aggravate the decline in the service life of the lossy battery, but also affect the service life of other batteries. Therefore, it is of g...

AI Technical Summary

Problems solved by technology

However, since the internal resistance of the battery is basically unchanged when its remaining capacity is greater than 40%, it is not possible to detect the remaining capacity of the battery and evaluate the health status of the battery only by the internal resistance of the battery.

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