Energy supply system and control strategy of lithium batteries of electric automobile

An electric vehicle and energy supply technology, applied in electric vehicle charging technology, electric vehicle, vehicle energy storage and other directions, can solve problems such as shortening lifespan, achieve long lifespan, facilitate battery balance, and prolong the overall lifespan of the system

Inactive Publication Date: 2016-05-25
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the problem of shortened lifespan caused by frequent high-current charging and discharging of lithium bat

Method used

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  • Energy supply system and control strategy of lithium batteries of electric automobile

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Embodiment Construction

[0018] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0019] The embodiment adopted by the present invention relates to an energy management and control system with a supercapacitor and a lithium battery, including: a charging port 4, a lithium battery pack 1, a motor and an energy recovery system 2, and low-power electrical accessories in the car 3. The first supercapacitor 10, the second supercapacitor 20, the third supercapacitor 30, the first control circuit A, and the second ...

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Abstract

The invention discloses an energy supply system and a control strategy of lithium batteries of an electric automobile, applied to energy storage and distribution of an electric automobile. Three super-capacitors are arranged between a lithium battery pack (1) and a motor and energy recycling system (2) of the automobile in parallel. With the system, the lithium batteries are less prone to large current charge-discharge impact, and thus the service life of the lithium batteries is prolonged extremely; as the life of the super-capacitors is long, the whole life of the system is prolonged, working conditions of large current discharging of the lithium batteries are reduced, and the safety of the batteries is enhanced. Current does not change greatly, so that the estimation on remaining capacity of the lithium batteries and the battery equalization are facilitated, and the algorithm complexity of a battery management system is lowered. Recycled energy is directly stored in the super-capacitors, does not need to be charged into the lithium battery pack to serve as power, and can be directly used by a motor, so that the recycled energy use ratio is enhanced, and the battery use cost is lowered.

Description

technical field [0001] The invention relates to the technical field of electric vehicle energy storage and release, in particular to an energy system topology with a supercapacitor and a lithium battery and a control strategy thereof. Background technique [0002] Supercapacitors have the characteristics of high charging and discharging power, fast charging and discharging speed, and long life. Lithium batteries have the characteristics of high energy density. At present, supercapacitors on existing electric vehicles are mainly used for vehicle starting and braking energy recovery. Lithium batteries Directly supply power to the motor and other electric accessories. During the process of driving the motor, the current flowing through the lithium battery is very large and will change frequently. This is one of the key factors leading to the shortening of the life of the lithium battery. From the lithium battery material and Structurally improving the service life of frequent h...

Claims

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Application Information

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IPC IPC(8): B60L11/00B60L11/18
CPCB60L50/40B60L53/00Y02T10/70Y02T10/7072Y02T90/14
Inventor 胡广地郭峰
Owner SOUTHWEST JIAOTONG UNIV
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