Device for managing equalization of series battery

Abstract

The invention provides an equilibrium management device for a series battery pack. The input terminals of a working power supply and an isolation power supply of the equilibrium management device are connected with input electrodes or an external power supply of the battery pack via power supply transfer switches and self-lock switches. When the battery pack is charged, discharged or idled without external power supply, the equilibrium management device can perform the equilibrium adjustment of the terminal voltage of each single battery in the series battery pack, so as to ensure the consistency in the terminal voltage of each single battery in the series battery pack. The transfer switches which are in a cascade connection are connected with each single battery in the series battery pack, so as to protect the single battery against short circuit caused by failure of the single transfer switch or the incorrect operation. The self-lock switch can prevent the equilibrium management device in the idle state from wasting the electric energy of the series battery pack.

Description

Technical field [0001] The invention relates to a balance management device for series battery packs, in particular to a device capable of balancing and managing the terminal voltages of individual cells in a series power battery pack during charging, discharging and idle processes of the battery pack. Background technique [0002] With the rapid development of electric bicycles and hybrid vehicles, the demand for power battery packs is increasing. In particular, lithium power batteries have the advantages of high voltage, high density, small size, and light weight, and are favored by the industry. They are composed of lithium batteries connected in series. There are more and more applications of power battery packs. [0003] Due to the initial differences in the charging capacity, charging and discharging characteristics, and life of each single battery that constitutes the battery pack, and the inconsistent changes in the characteristics of each battery during the service ...

AI Technical Summary

Problems solved by technology

[0003] Due to the initial differences in the charging capacity, charging and discharging characteristics, and life of each single battery that constitutes the battery pack, and the inconsistent changes in the characteristics of each battery during the service of the battery pack, the charging capacity of a single battery in a series battery pack decreases. Or when it fails, the terminal voltage of the single battery will rise too fast or too slow during the charging process, and it will also be accompanied by battery heating. Using ordinary charging methods will detect that the terminal voltage of a single battery exceeds the specified voltage and the other Stop charging when the battery is not fully charged, resulting in the failure of the charging capacity of the entire battery pack

[0004] Chinese patent 200520061050.7 discloses a charging control device for series battery packs with a voltage equalizing and shunting control board. The voltage equalizing and shunting control board is attached to each single battery, and the single battery with a higher terminal voltage can be charged during the charging process. Shunt to reduce the charging current of the single battery, reduce the rising speed of its terminal voltage, and achieve the purpose of consistent terminal voltage of each single battery. Since the voltage equalizing shunt circuit dissipates energy during operation, it will be accompanied by heat. For high power, Large-capacity batteries, the effect of the voltage equalization and shunt control circuit is extremely weak

This scheme must control both the rechargeable battery gating module and the discharging battery gating module at the same time. The control system is complex and requires high control components. The failure of any gating switch in the gating module may cause catastrophic consequences of battery short circuit.

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