Energy storage system of hybrid automobile

Abstract

The invention discloses an energy storage system of a hybrid automobile, which comprises at least one battery pack formed by connecting a plurality of batteries in series, at least one capacitor branch circuit formed by connecting a plurality of super capacitors in series, a battery discharge control circuit and a battery charge control circuit, wherein the input end of the battery discharge control circuit is connected with the input ends of all battery packs, while the output end is connected with the input ends of all capacitor branch circuits; the negative poles of all battery packs and the capacitor branch circuits are connected; and the input end of the battery charge control circuit is connected with a power supply end of a generator, while the output end is connected to the input end of the battery pack. The energy storage system can overcome the drawbacks of various conventional energy storage devices, has the combined advantages of the super capacitors and the batteries and has a prolonged overall service life.

Description

technical field [0001] The invention relates to the field of hybrid vehicles, in particular to an energy storage system applied to such vehicles. Background technique [0002] Traditional vehicles use gasoline or diesel as driving power, because gasoline or diesel will produce a lot of exhaust gas during the combustion process, which seriously pollutes the environment. In addition, gasoline or diesel is refined from petroleum, and the current storage capacity of petroleum is also low. Therefore, people began to try to use clean electric drive to gradually replace traditional fuel-intensive vehicles. Whether it is an increasingly mature hybrid vehicle or an electric vehicle that has not yet become popular, electric energy storage is a very important issue, because The energy storage of the car is used for its mobile driving, so it is necessary to ensure that there is enough electricity stored. At present, the energy storage devices used for hybrid vehicles mainly include the ...

AI Technical Summary

Problems solved by technology

[0003] (1) if figure 1 As shown, a number of supercapacitors 10 are used in series in series as an energy storage device, and then electrically connected with an energy conversion device 20 (such as an inverter). It can be seen from the characteristics of supercapacitors that they are small in mass, safe and reliable, and charge and discharge quickly. 1. The charging and discharging efficiency is high, which is conducive to the energy recovery control of the car during the braking process. However, due to the limited capacity of the super capacitor 10, the stored electricity is low. Under some special working conditions (such as continuous climbing conditions, etc.) ), there may be a power loss phenomenon, affecting the normal driving of the car;

[0004] (2) if figure 2 As shown, it adopts several batteries 30 (such as lead-acid batteries, nickel-metal hydride batteries, lithium batteries, etc.) 10 In contrast, the battery 30 has the characteristics of storing a large amount of electricity and has the ability to discharge continuously. However, its charge and discharge capacity is weak, the charge and discharge efficiency is low, the service life is short, and there is a risk of explosion. In actual use, most The plug-in structure is adopted, which requires long-term external charging to replenish the power, which makes the system structure complex and requires external charging supporting measures;

[0005] (3) if image 3 As shown, it is another energy storage device, which first connects several batteries 50 in series, connects several supercapacitors 60 in series, and then connects two series branches in parallel, and the branch where the batteries 50 are located is also connected in series in the forward direction. A diode 70 is used to prevent the lithium battery 50 from participating in the braking energy recovery; although this device combines the characteristics of the battery and the super capacitor, the super capacitor 60 is used to recover the braking energy, and the braking energy recovery efficiency is high, but due to The characteristics of the components determine that the battery 50 is used as the main energy storage element, so the battery 50 takes part in the power supply for a long time, resulting in a short service life of the battery 50, and the range of the voltage that can be used by the supercapacitor 60 is small, and the utilization rate is low

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