Electric vehicle and its low-voltage power supply device

Abstract

The invention discloses an electromobile and a low-voltage power supply device thereof. The device comprises a first low-voltage power supply end and a low-voltage auxiliary circuit; the first low-voltage power supply end is connected with a low-voltage auxiliary power supply of a non-vehicle-mounted charger to receive a first low-voltage DC output by the low-voltage auxiliary power supply of the non-vehicle-mounted charger; and the low-voltage auxiliary circuit includes an input end and an output end, the input end is connected with the first low-voltage power supply end, the output end is connected with a battery management system of the electromobile, and the low-voltage auxiliary circuit carries out voltage transformation on the first low-voltage DC according to the voltage type of the first low voltage DC and a power supply demand of the battery management system. Thus, compatibility requirements of non-vehicle-mounted chargers with different specifications of low-voltage auxiliary power supplies can be met, a user can use the non-vehicle-mounted charger more conveniently, and the user experience is improved.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a low-voltage power supply device for an electric vehicle and an electric vehicle. Background technique [0002] The low-voltage power supply systems of electric vehicles in the related art are generally divided into two types, one is a 12V low-voltage power supply system, and the other is a 24V low-voltage power supply system. According to the charging standard of the new energy vehicle industry, when the high-voltage power battery of an electric vehicle is charged in DC, the low-voltage power supply is provided by the low-voltage auxiliary power supply of the off-board charger, so the off-board charger is correspondingly divided into two types, one is to provide 12V The off-board charger for low-voltage auxiliary power supply, the other is the off-board charger that provides 24V low-voltage auxiliary power supply. [0003] However, the disadvantage of the related technology i...

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Problems solved by technology

[0003] However, the disadvantage of related technologies is that electric vehicles need to be charged by off-board chargers of corresponding specifications, that is, electric vehicles with 12V low-voltage power supply systems need to be charged by off-board chargers that provide 12V low-voltage auxiliary power, and electric vehicles with 24V low-voltage power supply systems It needs to be charged by an off-board charger that provides 24V low-voltage auxiliary power, which is not convenient for users to use

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