Storage battery pack control method and system

Abstract

The invention discloses a storage battery pack control method and system, which comprises the steps which are as follows: voltages of each storage battery are collected; the voltages of each storage battery are mutually compared to obtain a maximum voltage, a minimum voltage, and a voltage difference between the maximum voltage and the minimum voltage; then the charging-discharging state of the storage battery pack is judged; when the storage battery pack is under the charging state, the sizes of the voltage difference and a first preset value are judged; and when the voltage difference is equal to or more than the first preset value, a discharging command is generated to discharge the storage battery matched with the maximum voltage; when the storage battery pack is under the dischargingstate, the sizes of the voltage difference and a second preset value are judged; and when the voltage difference is equal to the second preset value, a command for reducing the system power is generated and is transmitted to a vehicle control system. The method can detect the voltages of each storage battery; moreover, when the consistency between single storage battery is destroyed, the problem of damaging the storage battery pack caused by overlarge difference between single storage batteries can be avoided through the means such as discharging or reducing the power, etc.

Description

technical field [0001] The present application relates to the field of storage battery technology, in particular to a method and system for controlling a battery pack. Background technique [0002] The continuous pollution of the environment and the intensified consumption of petroleum energy have made pure electric vehicles become the research object of various automobile manufacturers in various countries, and lead-acid batteries have occupied most of the market share of electric vehicle energy storage equipment by virtue of their low price advantage. The lead-acid battery on an electric vehicle is generally a battery pack composed of multiple lead-acid batteries. If the lead-acid battery is used improperly, it will lead to battery vulcanization, reduced battery capacity and shortened service life, which will directly affect the overall performance of the electric vehicle. Usage. [0003] At present, electric vehicles using lead-acid batteries usually use a controller to ...

AI Technical Summary

Problems solved by technology

[0004] Through research on the prior art, the applicant found that: for an electric vehicle that uses a lead-acid battery pack as a power battery, the vehicle controller can only detect the total voltage of the entire battery pack during the operation of the vehicle, but cannot detect the voltage of each battery pack. battery usage

When there are differences between individual batteries but the total voltage is not shown, it is impossible to measure the situation of each battery and perform corresponding processing, which will lead to over-discharge of some batteries in the long run

The same is true during the charging process. The charger detects the voltage of the entire battery pack through its output terminal and controls the charging process accordingly. Therefore, it is impossible to detect the charging status of each battery during charging, which may lead to overcharging of a single battery. Case

If a single battery is over-discharged or over-charged for a long time, its battery capacity will be reduced, its service life will be shortened, and the consistency of the entire battery pack will be damaged, so that the vehicle will show insufficient driving range or insufficient charging. And other issues

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