Device and method of detecting precharge function of battery pack

Abstract

The present invention relates to the field of electric vehicles and provides a device and a method of detecting a precharge function of a battery pack. The device of detecting the precharge function of the battery pack in the present invention comprises: a test unit and a control unit, wherein the control unit is used for connecting the test unit to two ends of the battery pack, such that the battery pack precharges the test unit; and when the time of completing the precharge is smaller than or equal to a preset value, determining that the precharge function of the battery pack is normal. Thepresent invention can automatically detect the precharge function of the battery pack well.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a battery pack pre-charging function detection device and method. Background technique [0002] The motor controller of the electric vehicle has a large capacitance in front of the load. During cold start, there is no charge on the capacitor or only a low residual voltage. Inrush current, this inrush current will cause damage to the high-voltage components, causing the high-voltage components to not work normally. The package needs to add a pre-charge function during design, and the capacitor is pre-charged before power-on. [0003] Existing equipment cannot detect whether the pre-charging resistance value during the assembly process is correct during the battery pack off-line testing process. The status of the pre-charging relay, main positive and main negative relays needs to be manually closed to detect whether there is an adhesion fault, and the test time is long. ...

AI Technical Summary

Problems solved by technology

[0002] The motor controller of the electric vehicle has a large capacitance in front of the load. During cold start, there is no charge on the capacitor or only a low residual voltage. Inrush current, this inrush current will cause damage to the high-voltage components, causing the high-voltage components to not work normally. The package needs to add a pre-charge function when designing, and the capacitor is pre-charged first when it is powered on

[0003] Existing equipment cannot detect whether the pre-charging resistance value during the assembly process is correct during the battery pack off-line testing process. The status of the pre-charging relay, main positive and main negative relays needs to be manually closed to detect whether there is an adhesion fault, and the test time is long. Items are easy to miss, and the pre-charging time cannot be tested. The complete function of the battery pack pre-charging needs to be tested on the vehicle to see if it is correct. The failure of the battery pack pre-charging function is easy to flow out to the vehicle, and the user experience is not good.

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