Power battery pack air pressure control rechargeable battery balance system

Abstract

The invention provides a pneumatic-control charging-type electric quantity equalizing system for a power battery pack, which comprises a battery pack manager and a plurality of electric quantity equalizers. The system is characterized in that a plurality of pneumatic switches are added, the equalizing charge current of each electric quantity equalizer is more than 10 A, the output ends of the individual electric quantity equalizers are correspondingly connected in parallel at the two ends of the unit batteries in the battery pack, and the output end of the battery pack manager is correspondingly connected with the control ends of the electric quantity equalizers through the normally-closed contacts of the individual pneumatic switches. By use of the system, the equalizing speed and efficiency are increased, the unit batteries are fully charged, and the electric quantities of the unit batteries are relatively equalized, so that the charging efficiency is not reduced. The electric quantity of an over-discharged unit battery is supplemented in time during discharging, and an under-voltage alarm is given when the voltage of the whole battery pack drops to a preset value. The service life of the whole battery pack is dependent on low-life unit batteries in the battery pack, and since the unit batteries can be fully charged each time and not over-discharged, the service life of the battery pack is increased.

Description

technical field [0001] The invention provides a power battery pack air pressure control charging type power balance system, which belongs to the technical field of power battery packs. Background technique [0002] At present, the power battery pack of a pure electric vehicle is composed of multiple batteries connected in series. Due to the dispersion of battery cells, the performance varies greatly. The life of the entire battery pack depends on a single low-life battery. This power battery system solution mainly has the following disadvantages: 1. The life of the battery pack is much lower than the cycle life of a single battery. 2. The battery pack is generally charged in series as a whole. The charging and discharging control detects the voltage of the whole or the battery cell. When the cell is overcharged or over-discharged, only an alarm signal is issued. The system cannot perform effective power balance and cannot play the role of the battery and the battery pack ma...

AI Technical Summary

Problems solved by technology

This power battery system solution mainly has the following disadvantages: 1. The life of the battery pack is much lower than the cycle life of a single battery

2. The battery pack is generally charged in series as a whole. The charging and discharging control detects the voltage of the whole or the battery cell. When the cell is overcharged or over-discharged, only an alarm signal is issued. The system cannot perform effective power balance and cannot play the role of the battery and the battery pack maximum performance

3. At present, the power balance system configured by the battery pack is a small current (less than 5 amps) discharge type (energy consumption) structure. This equalizer cannot meet the power balance requirements of the power battery pack of a pure electric vehicle above 100 amperes.

4. The balance control of the battery pack is generally controlled by the voltage of the battery cells. When the temperature changes, the power balance effect of the voltage control equalization system is not good.

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