Insulation monitoring circuit of lithium battery pack and monitoring method thereof

Abstract

The invention discloses an insulation monitoring circuit of a lithium battery pack and a monitoring method thereof. The insulation monitoring circuit comprises a battery cluster, a voltage detection module, a sampling operational amplifier circuit, a digital processing module, a fault alarm module, a double-pole single-throw switch, an equivalent insulation impedor and a plurality of resistors. The positive electrode and the negative electrode of the battery cluster are respectively connected with two resistors; the battery cluster is connected with the equivalent insulation impedor, the equivalent insulation impedor is divided into two paths, one path is grounded Earth, and the other path and the negative electrode of the battery cluster are respectively connected with the voltage detection module, the sampling operational amplifier circuit, the digital processing module and the fault alarm module in sequence; and double-pole single-throw switches are arranged between the two resistors on the positive electrode side of the battery cluster and the equivalent insulation impedor and between the two resistors on the negative electrode side of the battery cluster and the equivalent insulation impedor. The circuit is low in cost and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of battery insulation monitoring, and in particular relates to an insulation monitoring circuit of a lithium battery pack and a monitoring method thereof. Background technique [0002] The battery management system (Battery Management System, referred to as BMS) is the link between the battery and the user, and the main object is the secondary battery. Secondary batteries have the following disadvantages, such as less stored energy, short life, problems in series and parallel use, safety in use, and difficulty in estimating battery power. The performance of batteries is very complex, and the characteristics of different types of batteries vary greatly. The battery management system (BMS) is mainly to improve the utilization rate of the battery, prevent the battery from overcharging and overdischarging, prolong the service life of the battery, and monitor the state of the battery. [0003] The current batte...

AI Technical Summary

Problems solved by technology

Secondary batteries have the following disadvantages, such as less stored energy, short life, problems in series and parallel use, safety in use, and difficulty in estimating battery power, etc.

[0003] The current battery management system generally does not have an insulation monitoring function, and cannot detect changes in the insulation of the battery pack in real time and dynamically, which is not conducive to the safe use of the battery box

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