A kind of double relay lithium battery management and protection method

Abstract

The invention discloses a dual-relay lithium battery management and protection device. The device comprises a monitoring circuit, a control circuit, an overcharge relay, an over discharge relay, a charging diode and a discharging diode, wherein the overcharge relay and the over discharge relay are connected in series with a charging and discharging circuit in a lithium battery pack; the monitoringcircuit is used for monitoring the voltage of each battery cell in the lithium battery pack; one terminal of the control circuit is connected with the monitoring circuit; the other terminal of the control circuit is connected with the overcharge relay and the over discharge relay; the discharging diode is connected in parallel with the overcharge relay; the positive and negative electrodes of thedischarging diode are respectively connected with the positive and negative electrodes of the charging and discharging circuit; the charging diode is connected in parallel with the over discharge relay; and the positive and negative electrodes of the charging diode are respectively connected with the positive and negative electrodes of the charging and discharging circuit. The device can provideeffective overcharge and over discharge protection for a lithium battery, can realize free series-parallel connection of the lithium battery, remains a discharging function during overcharge protection and remains a charging function during over discharge protection, and is particularly applicable to power batteries and energy storage stations.

Description

technical field [0001] The technical field of lithium battery protection of the present invention particularly relates to a method for managing and protecting a lithium battery with double relays. Background technique [0002] Power lithium-ion batteries are more and more widely used in various equipment, including automobiles, UPS, power storage, and field power. It has the advantages of large capacity and small size, and is the mainstream of the current battery market. Since the lithium battery is composed of several cells connected in series, due to the limitation of its physical characteristics, each cell cannot be completely consistent when charging and discharging, so it is very easy to have the problem of consistency deviation, which is very likely to make lithium When the battery is in use, one or several cells inside it are overcharged or overdischarged. [0003] Overcharge and overdischarge are two major safety hazards in lithium-ion battery applications. Overch...

AI Technical Summary

Problems solved by technology

However, since there is only one trigger switch inside this physical protector, it means that once the physical protector is triggered, the charging and discharging circuits of the entire set of lithium batteries will be completely disconnected, and the charging and discharging functions of the lithium battery pack will be completely disconnected. If all are lost, the user can only wait for the energy balance device in the physical protector to balance the energy of the lithium battery without manual intervention, which makes it impossible for the power battery or power storage station to resume use as soon as possible

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