Short-term energy storage device based on super capacitor used for vehicle-mounted self-generating-electricity system and method thereof

Abstract

The invention discloses a short-term energy storage device based on a super capacitor used for a vehicle-mounted self-generating-electricity system. The device comprises an energy storage unit, an energy transmission unit and an electricity generation unit. The electricity generation unit can provide normal electric energy support for a load on a vehicle and at the same time the electricity generation unit provides power for the energy storage unit through the energy transmission unit. When the electricity generation unit can not provide normal electric energy support for the load on the vehicle, the energy storage unit provides power for the electricity generation unit through the energy transmission unit and provides redundant power supply for the load so as to ensure that the load acquires continuous power supply. In the invention, the super capacitor is used to replace a traditional storage battery and is served as an energy storage unit so that charging and discharging time is consistent or the charging time is shorter than the discharging time; under an instable power supply condition, charging of the energy storage unit can be completed as soon as possible so that the enough redundant power supply can be provided for the electricity generation unit; and simultaneously a service life of the energy storage device is prolonged.

Description

technical field [0001] The invention relates to a short-term energy storage device and method for a vehicle-mounted self-generating system based on a supercapacitor, which can be used in various vehicle-mounted self-generating control systems, and is suitable for various short-term energy storage fields. Background technique [0002] The traditional uninterruptible power supply system consists of batteries and UPS. As a general-purpose uninterruptible power supply, UPS is generally used in buildings, hospitals and other occasions that can provide 220V AC power supply stably for a long time. Its structure is relatively fixed, including an independent A charging circuit and a discharging circuit, but when the system power is large, the volume of the charging and discharging circuit increases at the same time, resulting in an increase in weight and occupied space, making it difficult for the weight and volume of the UPS to meet the requirements of the vehicle-mounted power gener...

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Problems solved by technology

[0002] The traditional uninterruptible power supply system consists of batteries and UPS. As a general-purpose uninterruptible power supply, UPS is generally used in buildings, hospitals and other occasions that can provide 220V AC power supply stably for a long time. Its structure is relatively fixed, including an independent A charging circuit and a discharging circuit, but when the system power is large, the volume of the charging and discharging circuit increases at the same time, resulting in an increase in weight and occupied space, making it difficult for the weight and volume of the UPS to meet the requirements of the vehicle-mounted power generation system; at the same time Affected by the charging characteristics of the battery, the charging current of the battery needs to be less than 20% of its capacity, causing the charging speed to be much lower than the discharging speed. In the case of large system power and fast charging and discharging, it is impossible to increase the charging speed and simultaneously charge and discharge with a large current. It will also affect the performance of the battery

[0003] The energy storage unit of the existing on-board power generation system is composed of a battery or super capacitor directly connected to a 12V DC on-board power supply. It is usually used in pure electric vehicles, but it cannot provide the 220V AC power required by the standard load. Therefore, it is necessary to design A new solution for uninterrupted power supply for vehicle self-generating system

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