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Power battery equalizing charge method and system

A technology for balanced charging and power batteries, applied in secondary battery charging/discharging, battery circuit devices, secondary battery repair/maintenance, etc., can solve problems such as slow speed, unsuitable series battery system, etc., to improve service life and performance The effect of complete consistency, operation and convenience

Inactive Publication Date: 2015-06-24
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The energy loss of this circuit is very small, but multiple transmissions are required to achieve equilibrium, so the speed is relatively slow, and it is not suitable for a battery system with more series in series

Method used

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  • Power battery equalizing charge method and system
  • Power battery equalizing charge method and system
  • Power battery equalizing charge method and system

Examples

Experimental program
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Effect test

Embodiment 1

[0048] A power battery pack for electric bicycles, consisting of 12 lithium-ion power batteries in series (each battery module is a single lithium-ion power battery), and its upper limit charging voltage is 43.2V, of which, the single lithium-ion power battery The rated capacity is 8Ah, and the charging cut-off voltage is 3.595V. The charging balance module adopts switching power supply.

[0049] First use the charger to charge the battery system with a constant current, and the charging current is 4A. When the voltage of any lithium-ion power battery reaches the charging cut-off voltage (3.595V) or the battery system reaches the upper limit charging voltage (43.2V), stop charging the charger. In this embodiment, the charging cut-off voltage of the single battery is the pre-arriving condition.

[0050]Then the charge equalization module carries out equalization charge to each lithium-ion power battery respectively, and the output voltage of each charge equalization module is...

Embodiment 2

[0053] A power battery system for electric vehicles consists of 94 lithium-ion battery modules connected in series. Each battery module (composed of 5 lithium-ion monomer batteries connected in parallel) has a rated capacity of 125Ah and a nominal voltage of 3.65V. The cut-off voltage is 4.1V, and the upper limit charging voltage of the battery system is 385V.

[0054] First use an external charger to charge the battery system with a constant current, and the charging current is 30A. When the voltage of any battery module reaches the charging cut-off voltage (4.10V) or the battery system reaches the upper limit charging voltage (385V), the battery management system will automatically cut off the charging circuit of the charger. In this embodiment, the upper limit charging voltage of the battery system is the first arrival condition.

[0055] Then the charging equalization module starts to perform equalization charging on each single battery, and the output voltage of each cha...

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Abstract

The invention discloses a power battery equalizing charge method and system. When a battery system formed by connecting a plurality of battery modules in series is charged till voltage of any battery module reaches charge cut-off voltage or the battery system reaches upper limit charge voltage, a battery management system or an external detection control circuit automatically opens an external charge circuit, equalizing charge units start to play an equalizing charge role, each charge equalizing module starts to execute a unified constant-voltage charge process until all the battery modules reach output voltage values of the equalizing modules, and equalizing charge is completed. By the adoption of the equalizing charge method, even after long-time use, single batteries can still keep good consistency, and the overall service life of the battery system is prolonged. Through the method, a mutually parallel equalizing charge mode of the battery modules or the single batteries in the battery system is achieved; in the equalizing charge mode, no energy exchange or loss is generated in the battery system, and the method is simple and easy to implement.

Description

technical field [0001] The invention relates to the technical field of power battery management, in particular to a method and system for equalizing charging of a power battery system for an electric vehicle. Background technique [0002] Under the conditions of existing power battery manufacturing engineering technology, there are certain differences in the performance of mass-produced single power batteries. At the same time, the power battery system is generally composed of a large number of single batteries connected in series. Under long-term use conditions, there will be deviations in battery capacity. The imbalance of battery capacity is directly reflected in the imbalance of battery terminal voltage, which in turn affects the entire power system. Normal management and use of the battery system. [0003] In the power battery system for electric vehicles, due to the large number of batteries connected in series, it is difficult to ensure that the performance of the ba...

Claims

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Application Information

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IPC IPC(8): H02J7/00H01M10/44
CPCY02E60/10
Inventor 邹春龙唐海波卢世刚付垚胡博简旭宇薛轶刘星雨
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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