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Current control method of boost converter-based renewable lithium battery/supercapacitor

A supercapacitor, boost converter technology, applied in battery circuit devices, DC power input conversion to DC power output, control/regulation systems, etc., can solve problems such as shortening cycle life and damaging lithium batteries

Active Publication Date: 2019-09-06
ZHEJIANG UNIV CITY COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the cycle life or state of health (SOH) of a renewable lithium battery depends on the current and operating temperature of the discharge / charge process. Excessive discharge current and high operating temperature will damage the lithium battery and shorten its cycle life.

Method used

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  • Current control method of boost converter-based renewable lithium battery/supercapacitor
  • Current control method of boost converter-based renewable lithium battery/supercapacitor
  • Current control method of boost converter-based renewable lithium battery/supercapacitor

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Embodiment Construction

[0066] The present invention will be further described below in conjunction with the examples. The description of the following examples is provided only to aid the understanding of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0067] The invention designs a parallel current control method suitable for an electric vehicle energy management system, and the circuit current is simplified to a high load current. The control circuit introduces a boost converter to increase the voltage at both ends of the supercapacitor to share the load current and increase the overall power. The present invention proposes a current mixing control method to realize the coordinated control of the boost conver...

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Abstract

The invention relates to a current control method of a boost converter-based renewable lithium battery / supercapacitor. The current control method comprises the steps of 1) designing a control circuittopology structure; 2) calculating duty ratio compensation values of a switch S1 and a switch S2; 3) designing a hybrid control method; 4) designing a hybrid control method flow; and 5) designing a simulation test. The current control method has the beneficial effects that a parallel current control method suitable for an electric vehicle energy management system is designed, and a circuit currentis simplified to a high load current. A boost converter is introduced to a control circuit, voltages of two ends of the supercapacitor are increased, and the purposes of sharing a load current and improving integral power are achieved. The current hybrid control method is proposed, synergic control of the boost converter, the switch S1 and the switch S2 is achieved, and the current value of the lithium battery is effectively controlled.

Description

technical field [0001] The invention relates to the field of renewable lithium batteries, in particular to a current control method for a renewable lithium battery / supercapacitor based on a boost converter. Background technique [0002] After comprehensively considering the environment, cost, performance and other factors, modern electric vehicles mainly use renewable lithium batteries (RLIB) as the main energy source, and realize energy recovery by reducing peak power. In order to effectively utilize the remaining available capacity of renewable lithium batteries, most automobile manufacturers use spent lithium batteries in traditional thermal power plants or long-term low-speed vehicles. Generally, the cycle life or state of health (SOH) of a renewable lithium battery depends on the current and operating temperature of the discharge / charge process. Excessive discharge current and high operating temperature will damage the lithium battery and shorten its cycle life. It has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H02J7/34H02M3/158
CPCH02J7/0077H02J7/345H02M3/158
Inventor 汪秋婷沃奇中戚伟肖铎
Owner ZHEJIANG UNIV CITY COLLEGE
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