An Unbalanced Battery Pack Charging Method Considering Temperature

A charging method and battery charging technology, which are applied in secondary battery charging/discharging, battery circuit devices, secondary batteries, etc., can solve problems such as inconsistent and unbalanced battery aging degrees, and reduce the risk of thermal runaway during charging. The effect of reducing heat generation and reducing the risk of inconsistent battery aging

Active Publication Date: 2019-07-02
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a temperature-considered unbalanced battery pack charging method, which solves the problem of temperature-optimized charging when unbalanced cells form a series battery pack without balancing conditions, and avoids the occurrence of single cells in the charging process. Inconsistent battery aging caused by temperature or uneven temperature

Method used

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  • An Unbalanced Battery Pack Charging Method Considering Temperature
  • An Unbalanced Battery Pack Charging Method Considering Temperature
  • An Unbalanced Battery Pack Charging Method Considering Temperature

Examples

Experimental program
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Effect test

Embodiment Construction

[0021] A method of charging an unbalanced battery pack that takes temperature into account, comprising the steps of:

[0022] Step 1, HPPC test to obtain battery open circuit voltage OCV

[0023] The battery cell is firstly charged and discharged once in a standard cycle according to the manual provided by the manufacturer. After the constant current-constant voltage (CC-CV) is fully charged, the constant current discharge reaches the lower limit cut-off voltage, and the battery capacity Q is measured; after standing for more than 1 hour, charge the HPPC Test and identify charging internal resistance and OCV-SOC curve. The parameter acquisition process is:

[0024] (1) After charging 10% of the battery capacity at a rate of 1C, let it stand for 2 hours. Record the battery terminal voltage as the open circuit voltage OCV at this point;

[0025] (2) Discharge at 1C rate for 10s, rest for 40s, charge at 0.75C rate for 10s;

[0026] (3) Return to (1), and perform the pulse pow...

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Abstract

The invention discloses an unbalanced battery pack charging method considering a temperature. The unbalanced battery pack charging method comprises a battery parameter acquisition and battery temperature estimation part and an unbalanced series battery pack charging control method part considering battery temperature change. Battery characteristic parameter information is obtained by monomer characteristic test, the temperature of each single battery is calculated iteratively by combining the obtained characteristic value and a battery thermal model, a charging current is adjusted according toresidual electric quantity state of each monomer in a battery pack and a battery temperature state estimation result, so that excessively large temperature difference of the monomer of the battery pack or excessively high monomer battery is prevented. The unbalanced battery pack charging method is suitably used for charging application of a series battery pack of an electric vehicle, an energy storage system and the like.

Description

technical field [0001] The invention relates to battery temperature estimation and series battery pack charging technology, in particular to a temperature-considered unbalanced battery pack charging method. Background technique [0002] Due to the constraints of manufacturing process, calendar aging, charge and discharge current, and operating environment temperature, there will inevitably be differences in characteristics between power battery cells. The difference in the characteristics of the battery cells will cause the power of the battery cells to be unbalanced after long-term use. [0003] For battery packs connected in series, the unbalanced battery capacity directly leads to a decrease in the available capacity of the battery pack and affects the charging and discharging power characteristics of the battery pack. In addition, the battery pack composed of unbalanced cells in series will also cause heat generation and temperature inconsistencies during the cycle char...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44H02J7/00
CPCH01M10/441H01M10/443H02J7/0013H02J7/0091Y02E60/10
Inventor 孙金磊魏睿智刘瑞航马乾
Owner NANJING UNIV OF SCI & TECH
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