Balanced monitoring and test system used for battery module

Abstract

The invention provides a balanced monitoring and test system used for a battery module. The balanced monitoring and test system comprises a collection module, a storage module, an operation module and a signal output module. The collection module is connected with the battery module so as to be used for collecting an open-circuit voltage and a temperature of each single battery of the battery module. The storage module is connected with the collection module and the battery module so as to be used for storing battery state data collected by the collection module. The operation module is connected with the storage module so as to be used for obtaining an SOC of the battery module after estimating an SOC of each single battery, estimating the deviation value of the SOC of the battery module and a preset SOC, and comparing the deviation value with a preset deviation threshold value. The signal output module is connected with the operation module and the battery module so as to be used for sending PWM signals to a balance circuit of the battery module to start the balance circuit when the deviation value is larger than the preset deviation threshold value. The system can send starting signals or suspension signals of the balance circuit in real time according to actual needs, and can monitor the balancing process of the battery module.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a balance monitoring and testing system for battery modules. Background technique [0002] Lithium battery has become a new generation of ideal power source due to its advantages of large energy storage capacity, high working voltage, good cycle performance, low self-discharge rate, no memory effect, and no pollution, and is widely used in electric vehicles and hybrid vehicles. However, the voltage and current of a single battery cell are too low to drive the motor. Therefore, multiple battery cells are connected in parallel, series or in parallel, and are combined with control, balance, monitoring, communication and protection circuits to form a battery. module for higher drive power. [0003] Lithium batteries have a safe working voltage. Once the voltage exceeds the upper or lower limit, it will affect the energy efficiency and life of the battery module, and even cause saf...

AI Technical Summary

Problems solved by technology

However, when the battery module is working, when there is an abnormal situation in the battery module that the voltage of the battery cells is outside the safe range, if the balance circuit is activated, the energy will be continuously transferred between the battery cells, which will easily cause all the battery cells to The voltage and SOC of the body continue to decrease, which greatly increases the self-discharge rate of the entire battery module, and even causes the module to over-discharge, and the opening of the balance circuit causes unnecessary energy waste

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