Battery management system capable of automatically shutting off unavailable units in serial-connection battery pack

Abstract

The invention discloses a battery management system capable of automatically shutting off unavailable units in a serial-connection battery pack, which is characterized by comprising a battery pack, wherein the battery pack is formed by a plurality of battery units which are connected in series. Two ends of each battery unit are connected with battery unit detection modules, a positive electrode and a negative electrode of each battery unit are connected with two contacts of a two-way interlocking switch respectively, a movable end of the two-way interlocking switch is connected with a negative electrode of the adjacent battery unit so as to connect the battery units in series, the battery unit detection modules are connected with the two-way interlocking switch and are connected with a main control module through communication circuits, the battery pack is connected with a main control switch in series, the main control switch and the main control module are connected, and the main control module is connected with an upper computer through a bus. By the battery management system, the battery units to be unavailable in the serial-connection battery pack can be shut off from the integral serial-connection loop, and the battery units shut off can be connected again during recharging when in needs. The battery management system is high in flexibility and the requirement for uniformity of batteries is reduced.

Description

technical field [0001] The invention relates to a battery management device, in particular to a battery management system capable of automatically removing failed units in a series battery pack. Background technique [0002] With the popularization of various battery-powered devices, the reliability and maintenance cost of battery systems have drawn more and more attention. Due to the low voltage of the battery cells, in order to meet the voltage level requirements of the electrical appliances, the battery cells need to be connected in series to achieve a higher voltage, which is convenient for directly driving the electrical appliances. For example, electric bicycles need a voltage of about 48v, and electric buses need a voltage of about 500v, and a certain number of batteries need to be used in series. However, the series battery system may cause the failure of the entire string of batteries due to the poor performance of a certain battery unit in the series circuit, caus...

AI Technical Summary

Problems solved by technology

Although adding a balancing circuit to the battery pack can alleviate individual differences in the operation of the battery unit to a certain extent, if the battery unit fails for some reason, the battery pack will still fail. The traditional method can only treat the symptoms but not the root cause.

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