Method for monitoring deformation (bulge) of power battery of new energy automobile

Abstract

The invention provides a method for monitoring deformation (bulge) of a power battery of a new energy automobile. A resistance strain gauge is adhered to an external surface of a monitored single power battery, and according to a strain effect principle that the end resistance value of the resistance strain gauge changes correspondingly when the resistance strain gauge generates mechanical deformation under the action of external force, when the monitored single power battery is deformed (bulged), the resistance strain gauge adhered to the external surface of the monitored single power battery is mechanically deformed under the action of mechanical force, the end resistance value of the resistance strain gauge is changed in the process, and the input voltage applied to one end of the resistance strain gauge is constant voltage; and the output voltage of the other end changes along with the change of the resistance value, and the changed voltage is transmitted to a power battery pack management system (BMS) through a line, so that early warning is generated, faults are determined in time, and hidden dangers are eliminated.

Description

technical field [0001] The present invention relates to the management of power batteries of new energy vehicles, in particular to a method for monitoring the deformation (bulging) of power batteries of new energy vehicles Background technique [0002] The power battery pack of a new energy vehicle is composed of several power battery cells. After the continuous charging and discharging process, individual cells in the power battery pack will have a phenomenon of power imbalance, which will cause individual batteries to be overcharged or overcharged. According to the structural characteristics and chemical characteristics of the power battery, overcharging will cause the positive electrode ions to run into the negative electrode material, and the original full grid of the positive electrode will deform and collapse. However, there are more and more ions in the negative electrode, and the excessive accumulation makes the ions grow into tree-like crystals, which destroys the i...

AI Technical Summary

Problems solved by technology

The content described in the Chinese patent "Battery Bulge Detection Sensor" does not explain the principle of the sensor used to detect the signal generated by the battery bulge, which has certain limitations.

[0003] The new energy vehicle power battery management system monitors safety data such as overvoltage, undervoltage, overcurrent, overtemperature, and insulation for each single power battery in the entire power battery combination. lack of monitoring

The consequences of the deformation (bulge) of the power battery can be large or small, ranging from causing a drop in the energy storage of a single power battery and affecting the use of the entire battery pack, to serious fire or explosion accidents