Electronic switch switching circuit for active equalization of battery management system

Abstract

The invention discloses an electronic switch switching circuit for active equalization of a battery management system. The electronic switch switching circuit comprises n batteries, n+1 battery switching circuits, a switching circuit, a charging and discharging module and a control module, wherein a negative electrode of the nth battery is connected with one end of the nth battery switching circuit, a positive electrode of the nth battery is connected with one end of the (n+1) th battery switching circuit, the other end of the (n+1) th battery switching circuit is connected with a first inputend of the switching circuit, the other end of the nth battery switching circuit is connected with a second input end of the switching circuit, a first output end of the switching circuit is connectedwith the charging and discharging module, and a second output end of the switching circuit is connected with the charging and discharging module; and the n+1 battery switching circuits and the switching circuit are respectively connected with the control module. The electronic switch switching circuit adopts a universal field effect transistor as a battery change-over switch to replace a relay and a solid-state relay in the prior art, so that the service life, the reliability and the cost performance are remarkably improved.

Description

technical field [0001] The invention relates to the technical field of battery management, in particular to an electronic switch switching circuit for active balancing of a battery management system. Background technique [0002] With the development of technology, a single battery cannot meet the power supply requirements of high-power equipment. Therefore, batteries need to be connected in series to form a battery pack. unbalanced. When leaving the factory, the manufacturer will screen and sort the batteries to judge the SOC by voltage, but individual differences will polarize the battery voltage over time. Without external intervention, when the battery pack is fully charged, the weak cell (low capacity or high internal resistance) will have a higher voltage than other batteries in series; at the same time due to high internal resistance or faster discharge rate (due to small capacity) , the weak point battery will have a lower voltage than the other batteries during di...

AI Technical Summary

Problems solved by technology

[0005]Aiming at the problem of low battery management efficiency in the prior art, the present invention proposes an electronic switch switching circuit for active balancing of battery management systems, by using N-channel An enhanced field effect transistor is used as a battery switching switch, and different driving circuits are provided for the battery switching switch, which expands the number of batteries connected in series that the electronic switching circuit can control and manage, thereby improving battery management efficiency

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