High-capacity charging-discharging battery management system

Abstract

The invention discloses a high-capacity charging-discharging battery management system. The high-capacity charging-discharging battery management system comprises a single battery voltage detection and equalization control circuit, a microprocessor, a short circuit protector, an SOC evaluation unit, a current detection unit, a charging control circuit, a discharging control circuit and a temperature detection circuit, wherein the battery management system is characterized in that the single battery voltage detection and equalization control circuit collects the voltage of each single battery in real time, and outputs the collected voltage signal to the microprocessor; meanwhile, the single battery voltage detection and equalization control circuit receives the signal output by the microprocessor and outputs a control signal to an equalization circuit; the equalization circuit receives the control signal output by the single battery voltage detection and equalization control circuit; and the equalization circuit performs bypassing on the charging current of the single battery with high voltage. According to the high-capacity charging-discharging battery management system, the parameter of the single battery is collected in real time and the current electric quantity of the battery is evaluated for performing charging-discharging protection on the battery and for equalizing the electric quantity of each battery; and therefore, the high-capacity charging-discharging battery management system has the characteristics of low cost, low power consumption, high reliability and the like, and is bright in the application prospects.

Description

technical field [0001] The invention relates to a battery management system, in particular to a large-capacity charging and discharging battery management system. Background technique [0002] With the development of the economy and the increasingly prominent issues of energy and environmental protection, the traditional development model based on limited oil resources is becoming increasingly unacceptable. Power batteries with zero emissions and low noise have been widely used in the fields of automobiles, medical equipment and measuring instruments. Due to the constraints of the battery manufacturing technology and process, the consistency of the single battery is poor. If the battery has problems such as overcharge and overdischarge during the charging and discharging process, the life of the battery will be seriously shortened, and the battery will even be scrapped directly; secondly, due to The battery is closed, and it is difficult for the user to make an accurate ass...

AI Technical Summary

Problems solved by technology

Due to the constraints of the battery manufacturing technology and process, the consistency of the single battery is poor. If the battery has problems such as overcharge and overdischarge during the charging and discharging process, the life of the battery will be seriously shortened, and the battery will even be scrapped directly; secondly, due to The battery is closed, and it is difficult for the user to make an accurate assessment of the current capacity of the battery; and the battery is extremely prone to fire or explosion in a short-circuit state

[0003] The existing domestic power battery management system generally supports a load current of tens of amps. The short-circuit protection and over-current protection are usually implemented by fuses. When a short circuit occurs, it cannot be shut down immediately. It needs to wait until the fuse is blown to protect, which is low in safety; The output voltage of the battery is collected to estimate, and the power estimation error is large; the charging switch and discharging switch of the BMS battery management system both use relays, and the high-current relays are bulky, difficult to install, large in power consumption, high in cost, and large in size

Images