Fault detection system and method for key components of starting power supply of lithium battery for vehicles

Abstract

The invention discloses a fault detection system and method for key devices of a vehicle lithium battery starting power supply. The system comprise an SOH detection module, an MOS fault detection module, a relay fault detection module, a sampling resistor fault detection module, a battery pack line connection loosening detection module and a state evaluation module. The method comprises that a battery capacity of the starting power supply is detected; the aging condition of an MOS in the vehicle starting power supply is detected; the aging condition of a relay in the vehicle starting power supply is detected; the aging condition of a sampling resistor in the vehicle starting power supply is detected; a connection loosening condition of a battery pack in the starting power supply is detected; and according to detection results of the key devices, the health state of the starting power supply is evaluated. The integral health state of the starting power supply is evaluated according to aging conditions of the key devices, the reliability of the starting power supply is improved, and the system and method can be widely applied to battery monitoring and control fields.

Description

technical field [0001] The invention relates to the field of battery monitoring and control, in particular to a system and method for detecting failures of key components of starting power supplies of lithium batteries for vehicles. Background technique [0002] Since the instantaneous current of the starting power supply of the automobile is extremely large and the working time is short, it is very difficult to detect the fault of the starting power supply, and the existing fault detection efficiency of the starting power supply is very low. In addition, the fault detection of the starting power supply includes many aspects, such as battery SOH detection, MOS tube fault detection, relay fault detection, sampling resistor fault detection and battery pack connection loose fault detection, etc. Among them, the aging of the battery in the starting power supply will make the starting The power supply cannot provide enough current to start the car; the aging of the MOS tube or re...

AI Technical Summary

Problems solved by technology

[0002] Due to the extremely large instantaneous current of the starting power supply of the car and the short working time, it is very difficult to detect the fault of the starting power supply, and the existing fault detection efficiency of the starting power supply is very low

In addition, the fault detection of the starting power supply includes many aspects, such as battery SOH detection, MOS tube fault detection, relay fault detection, sampling resistor fault detection and battery pack connection loose fault detection, etc. Among them, the aging of the battery in the starting power supply will make the starting The power supply cannot provide enough current to start the car; the aging of the MOS tube or relay in the starting power supply will cause the protection functions of the starting power supply, such as overcharge protection and over-discharge protection, to be lost; the aging of the sampling resistor in the starting power supply will make the The current estimation of the starting power supply is inaccurate, and the accuracy of the state estimation decreases, which is not conducive to system maintenance; the connection of the starting power supply is loose due to the vibration of the car during the use of the starting power supply, and it is very easy to catch fire under the condition of instantaneous high current, causing danger

At present, there is no complete protection strategy for the starting power supply of automobiles to integrate the fault detection of the key components of the starting power supply, which is not comprehensive enough

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