Battery pack insulation detection apparatus and insulation detection method thereof

Abstract

The invention relates to a battery pack insulation detection apparatus and an insulation detection method thereof. The insulation detection apparatus includes a controller and insulation detection modules one-to-one corresponding to battery modules. Signal input terminals of each insulation detection module are connected to a positive electrode and a negative electrode of the corresponding battery module. The output of the insulation detection modules is connected to a signal input terminal of the controller. During the insulation detection, for any one battery module, firstly current values on a positive electrode detection resistor and on a negative electrode detection resistor corresponding to the battery module are collected. Then the collected two current values are compared. When an error between the two current values is larger than a preset first comparison threshold, the battery module is judged as defective insulation. The detection apparatus can accurately obtain that which battery module in the battery pack has an insulation fault, accurately judges the insulation fault position in the battery pack, lays foundation for subsequent fault maintenance and fault elimination, and ensures the safety, the reliability and the economy of the battery pack usage.

Description

technical field [0001] The invention relates to a battery pack insulation detection device and an insulation detection method thereof. Background technique [0002] With the rapid development of the new energy industry in the country, in order to meet market demand, the energy level and voltage level requirements of lithium battery power systems in various fields are also gradually increasing. At present, lithium battery power systems all have group characteristics, that is, in the battery system. The core component is a battery pack composed of several battery modules in series, that is, the battery pack is composed of n battery modules connected in series, and each battery module is composed of at least one single battery. Facing the battery system with high voltage and high energy density, the internal failure of the battery system caused by poor insulation is also the most common, and the internal discharge and internal short circuit caused by it are also the most harmfu...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a battery pack insulation detection device to solve the problem that the traditional insulation detection device cannot determine the location of the insulation fault

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