A battery system of a vehicle and a method for charging and discharging the same

Abstract

The invention provides a battery system for a vehicle, comprising: an energy storage device, the energy storage device includes a plurality of battery packs coupled in series, and an inter-battery switch is arranged between adjacent battery packs; a DC charging and discharging interface, a DC charging and discharging interface The positive terminal of the interface is coupled to one end of the switch between the positive poles, the other end of the switch between the positive poles is coupled to the positive terminal of the battery pack, the negative terminal of the DC charging and discharging interface is coupled to one end of the switch between the negative poles, and the other end of the switch between the negative poles is coupled to Connected to the negative terminal of the battery pack; the control unit is connected to the energy storage device, the switch between the batteries, the switch between the positive poles and the switch between the negative poles, so as to realize the charging and discharging mode of the battery pack according to the high-voltage charging and discharging mode, the low-voltage charging and discharging mode, and the protection charging and discharging mode. One of the charging or discharging. It also provides a charging and discharging method for the battery system of the vehicle, which solves the problem that the electric vehicle with a high-voltage platform battery cannot be charged when it encounters a low-voltage charging and discharging pile, and improves the applicability and safety of the vehicle.

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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