Integrated low-voltage energy storage power supply system for vehicle and control method thereof

Abstract

The invention discloses an integrated low-voltage energy storage power supply system for a vehicle. The integrated low-voltage energy storage power supply system comprises a storage battery; a power supply main switch, the input end of the power supply main switch being connected with the positive electrode of the storage battery, and the negative electrode of the storage battery being the whole vehicle common ground; a charging relay, the input end of the charging relay being connected with the output end of the power supply main switch, and the output end being grounded; a current-limiting resistor, the input end of the current-limiting resistor being connected with the output end of the charging relay; a super capacitor module, formed by connecting a plurality of super capacitors in series and in parallel; a parallel relay; and a starter, the output end of the starter being connected with a whole vehicle engine starter. The parallel relay enables the output end of the power supply main switch to be connected in parallel with the positive electrode of the super capacitor module. The input end of the starter is connected with the output end of the current-limiting resistor, the output end of the parallel relay and the positive electrode end of the super capacitor module. Charging current-limiting control can be realized, and the starting success rate is improved. The invention further provides a control method of the integrated low-voltage energy storage power supply system for the vehicle.

Description

technical field [0001] The invention relates to a vehicle-used integrated low-voltage energy storage power supply system and a control method thereof, belonging to the field of vehicle electronic appliances. Background technique [0002] As an important part of automotive electrical appliances, the vehicle-mounted low-voltage electric energy storage device has the functions of providing starting current for the starter when starting the engine during the starting process, assisting the generator to supply power to electrical equipment when the generator is overloaded, and providing power for the starter when the engine is idling. Functions such as power supply for electrical equipment, maintenance of vehicle voltage stability, and power storage when the terminal voltage of the generator is higher than the voltage of the lead-acid battery. It is required to have a certain energy density and power density, as well as low cost and high reliability. [0003] As the most widely ...

AI Technical Summary

Problems solved by technology

When the vehicle works in cold regions, the low temperature causes the viscosity of the engine oil to increase and water vapor to condense, resulting in a large starting resistance of the engine; at the same time, the activity of the positive and negative electrode materials of the battery decreases due to the low temperature, and the discharge capacity is weakened

Difficulty in starting the engine at low temperature caused by many factors

Vehicles with engine start-stop function have a relatively short service life due to the frequent use of battery power to start the engine

[0004] As a new type of electrical energy storage device, supercapacitors are different from traditional chemical power sources. They store and release electrical energy reversibly through physical changes. They have the advantages of fast charging speed, long cycle life, high kilometer density, and good ultra-low temperature performance. At the same time, its low energy density, high self-discharge rate, and the need for a special charging circuit limit its application scenarios.

Images