Dual-power supply system based on electric vehicle and control method of dual-power supply system

Abstract

The invention discloses a dual-power supply system based on electric vehicle and a control method of the dual-power supply system. According to the dual-power supply system, a first charging loop and a second charging loop are connected in parallel between a high-voltage direct current input end and a low-voltage load in the vehicle, and a communication and control module is connected between the first charging loop and the second charging loop; and the communication and control module detects the states of the first and second charging loops and cuts off the first and / or second charging loops to supply power to the low-voltage load in the vehicle according to the states. According to the system and the method, the two charging loops are adopted, the two charging loops operate independently and do not influence each other, so that the redundancy of the charging system is increased; and low-voltage loads in the vehicle are graded, power is supplied to an important primary load or all loads according to the electric quantity of a lithium battery, and therefore, the system safety of the electric vehicle is improved.

Description

technical field [0001] The invention relates to a power supply circuit, in particular to an electric vehicle-based dual power supply system and a control method thereof. Background technique [0002] At present, the production scale of new energy vehicles is increasing day by day, and the demand for low-voltage batteries is also increasing. Traditional lead-acid batteries are large in size, high in weight, low in energy density, and high in recycling costs. However, lithium batteries are more and more used in future electric vehicles because of their high energy density, long life, low environmental pollution, and high cost performance. Lead storage batteries will be replaced by lithium batteries. With the continuous increase of in-vehicle entertainment systems, including in-vehicle audio systems, navigation systems, in-vehicle information systems, and in-vehicle home appliances, people's requirements for the output power of electric vehicles are also getting higher and hig...

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Problems solved by technology

[0003] see figure 1 In the existing power supply circuit shown, the electric vehicle converts the high voltage to low voltage through the DCDC module, and the low voltage first passes through the lithium battery and then to the load end. However, the existing low-voltage lithium battery considers the comprehensive factors of cost and weight, so the capacity of the low-voltage lithium battery is as follows: The trend of shrinking, which leads to the shrinking of battery capacity, and the current trend of increasing the low-voltage load on the vehicle, have produced a contradiction that is not easy to arise between the two

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