Vehicle battery system and charging and discharging method thereof

Abstract

The invention provides a vehicle battery system. The battery system comprises an energy storage device, a direct-current charging and discharging interface and a control unit, wherein the energy storage device comprises a plurality of battery packs which are coupled in series, inter-battery switches are arranged between every two adjacent battery packs; the positive pole end of the direct-currentcharging and discharging interface is coupled with one end of an inter-positive switch, and the other end of the inter-positive switch is coupled with positive pole ends of the battery packs, the negative pole end of the direct-current charging and discharging interface is coupled with one end of an inter-negative switch, and the other end of the inter-negative switch is coupled with the negativeelectrode ends of the battery packs; and the control unit is connected with the energy storage device, the inter-battery switches, the inter-positive switch and the inter-negative switch so as to realize charging or discharging of the battery packs according to one of a high-voltage charging-discharging mode, a low-voltage charging-discharging mode and a protection charging-discharging mode. The invention further provides a charging and discharging method of the vehicle battery system. According to the method and the system, the problem that an electric vehicle with a high-voltage platform battery cannot be charged through a low-voltage charging and discharging pile is solved, and the applicability and the safety of the vehicle are improved.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and relates to a charging and discharging station for electric vehicles, in particular to a battery system of a vehicle and a charging and discharging method thereof. Background technique [0002] With the popularization of electric vehicles, passenger cars have gradually begun to use battery systems with high-voltage platforms (such as 800V platforms). However, there are two specifications of charging and discharging piles on the market (such as: low-voltage When an electric vehicle with a platform battery encounters a low-voltage charging and discharging pile, it cannot perform DC charging and discharging, which reduces the convenience of the vehicle and cannot meet the needs of users, resulting in a decline in product competitiveness. [0003] When a current passenger car encounters a partial failure inside the battery system (such as aging of a single battery, overvoltage or undervo...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that electric vehicles using high-voltage platform batteries cannot perform DC charging and discharging when encountering low-voltage charging and discharging piles

The invention provides a vehicle battery system and a charging and discharging method thereof. The vehicle battery system and its charging and discharging method solve the problem that an electric vehicle with a high-voltage platform battery cannot be charged when it encounters a low-voltage charging and discharging pile, and further improves the performance of the vehicle. Applicability and safety

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