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Variable frequency pulse charging method for lithium-ion battery of hybrid electric vehicle

A technology for hybrid electric vehicles and lithium-ion batteries, which is applied in the field of variable-frequency pulse charging of lithium-ion batteries for hybrid electric vehicles. It can solve the problems of long charging time and difficulty in determining the pulse cycle of the pulse charging method, and achieve shortened charging time and fast and effective charging. Management and efficiency improvement

Inactive Publication Date: 2016-02-10
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the charging method of the battery pack mainly adopts the three-stage charging method, but this charging method takes a long time to charge and cannot meet people's needs for fast charging.
The pulse charging method is a more effective fast charging method, but the pulse period of the pulse charging method is difficult to determine

Method used

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  • Variable frequency pulse charging method for lithium-ion battery of hybrid electric vehicle
  • Variable frequency pulse charging method for lithium-ion battery of hybrid electric vehicle
  • Variable frequency pulse charging method for lithium-ion battery of hybrid electric vehicle

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Embodiment Construction

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0032] In the present invention, the optimal charging frequency is measured by the AC impedance method: first, a larger step size Δf is used to search for the range of the optimal charging frequency, and then the step size is reduced proportionally, and the search is repeated, so that the range of the maximum current found is It will be reduced by half, and the accuracy will be doubled, and the cycle will continue until it approaches the maximum current value. The schematic diagram of its working mode is as follows figure 1 shown. Specific steps are as follows:

[0033] 1) Initialize the program first: detect time t=0, start timing;

[0034] (2) According to the second-order RC model of the battery, establish the state equation and system equation of the nonlinear system x(k)=f(x(k-1),u(k))+w(k), y(k) =g(x(k),u(k))+v(k); w(k) and v(k) are G...

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Abstract

The invention discloses a variable-frequency pulse charging method for lithium ion batteries of hybrid cars. The frequency spectrum of a battery is measured through an alternate-current impedance method to obtain an initial frequency of battery charging, further accurate tracking is conducted through an algorithm of determining an optimal frequency, and therefore the optimal frequency is obtained. The charging method solves the problem that a lithium ion battery pack cannot be rapidly charged under the condition that the charging consistency and the pulse period are difficult to determine. Not only the charging time can be shortened, but also the purpose of depolarization can be achieved. The service life of the battery pack is effectively prolonged.

Description

technical field [0001] The invention belongs to the field of energy-saving and new-energy vehicles, and relates to a variable-frequency pulse charging method for a lithium-ion battery of a hybrid vehicle. Background technique [0002] With the rapid development of the automobile industry, energy and environmental issues have become increasingly prominent. In order to reduce the energy consumption and pollution problems of fuel vehicles, hybrid electric vehicles (HEV) came into being. The state of charge (State of Charge, SOC) of the power battery of a hybrid electric vehicle is an important data of the battery management system. The SOC of the HEV power battery pack requires real-time, online, and accurate estimation. Guarantee that the battery pack will be damaged in advance due to overcharging and over-discharging. The traditional battery charging methods mainly include: constant voltage method, constant current method, segmental constant current method, method combining...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44
CPCH01M10/44Y02E60/10
Inventor 吴铁洲柏祎山丁稳房李子龙
Owner HUBEI UNIV OF TECH