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A battery pack charging method that can realize battery balance

A charging method and battery equalization technology, applied in secondary battery charging/discharging, battery circuit devices, secondary battery repair/maintenance, etc., can solve problems such as complex structures, and achieve the effect of solving complex circuit structures

Active Publication Date: 2017-12-05
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing equalization methods are all realized through external equalizers, and the structure is very complicated

Method used

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  • A battery pack charging method that can realize battery balance
  • A battery pack charging method that can realize battery balance
  • A battery pack charging method that can realize battery balance

Examples

Experimental program
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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] A battery pack charging method for realizing battery balance proposed by the present invention includes: determining the optimal charging current cycle period, determining the optimal frequency of the charging current and the pulse duty ratio.

[0031] The process of determining the above optimal charging current cycle period:

[0032] 1) Based on the first-order RC equivalent circuit model, such as figure 1 As shown, a single battery model is established, and the test data is used to verify the single battery model;

[0033] 2) Establish a single-cell battery model in which different single-cell batteries are connected in parallel, such as figure 2 As shown, the simulation studies the self-balancing time between the internal cells of the single cell under different SOC under different numbers of parallel cells, such as image 3 As shown, when 8 single cells...

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Abstract

The invention discloses a battery pack charging method capable of achieving battery equalization. The battery pack charging method comprises the following steps of 1, building a unit battery model; 2, building a single-battery model in which different unit batteries are connected in parallel; 3, testing a change relation of the internal resistance and the capacity of the unit battery with circulation numbers; 4, studying the repeatedly-executed step 2 of the single battery in different circulation numbers; 5, determining optimal charging current cycle period; 6, setting a charging frequency matrix and a duty cycle matrix; 7, respectively charging the battery by using different frequencies at different duty cycles; 8, acquiring the average charging current under the charging frequency, and calculating optimal charging current frequency under the duty cycle; 9, recording optimal frequency and corresponding current; and 10, readjusting the duty cycle for recording the optimal frequency again. According to the battery pack charging method capable of achieving battery equalization, provided by the invention, the difference between the single batteries can be reduced, meanwhile, the optimal charging frequency is considered, and the battery is rapidly charged.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and in particular relates to a charging control mode of a power battery pack of an electric vehicle. Background technique [0002] In order to ensure the safe and reliable operation of the battery, the power battery pack is generally equipped with a battery management system. The functions of the battery management system mainly include: working parameter monitoring, state parameter estimation, battery balancing control, thermal management, etc. Accurate estimation of the state parameters of the battery pack can ensure the safety of the battery pack, but it cannot reduce or eliminate the differences between individual batteries. For this reason, the predecessors proposed active and passive equalization methods for battery packs. Passive equalization converts excess energy into heat and releases it to maintain the energy balance of each single battery. The circuit and control method of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00H01M10/44
CPCY02E60/10
Inventor 王丽梅陈龙江浩斌袁朝春汪若尘汪少华盘朝奉徐兴
Owner JIANGSU UNIV
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