New energy vehicle battery protection method and device based on battery voltage

Abstract

The invention provides a new energy vehicle battery protection method and device based on battery voltage. According to the method and the device, if a vehicle is operated in a non-driving state, a lower limit reference value of battery voltage is set as a, an upper limit reference value of the battery voltage is set as b, battery direct current bus voltage is detected, if bus voltage mu >=b-delta, overvoltage early warning is sent, b-delta is an overvoltage early warning point of the vehicle set under the non-driving state, delta is defined as voltage return difference, and power output is limited; if the bus voltage is increased to the lower limit reference value of the battery voltage, which is mu >=b, the power output is limited as zero at the moment; if the bus voltage mu <=a or mu >=b+delta, undervoltage / overvoltage warning is sent, a is an undervoltage warning point of the vehicle set under the non-driving state, b+delta is an overvoltage warning point of the vehicle set underthe non-driving state, and delta is defined as the voltage return difference. The problem of battery damage caused by abnormal battery voltage of the vehicle under the non-driving state is solved.

Description

technical field [0001] The invention belongs to the field of new energy vehicles, in particular to a method and device for protecting batteries of new energy vehicles based on battery voltage. Background technique [0002] The new energy vehicle will charge and discharge the high-voltage power battery according to different road conditions during driving. This phenomenon is realized by sending specific instructions to the CAN network through the vehicle ECU, and the motor controller accepts and executes the instructions. By controlling the generator or The drive motor is complete. The voltage platform of the power battery is a range. If it exceeds this range, it will not only cause damage to the battery body, but also increase the risk of failure of electronic components such as the motor controller power module and electrolytic capacitor, which will ultimately affect the safety of driving vehicles. In order to solve this problem, according to the national standard requirem...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a new energy vehicle battery protection method and device based on battery voltage, which is used to solve the problem of battery damage caused by abnormal battery voltage when the vehicle is not driving

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