Automobile lithium battery charge balancing method and balancing system

A charge balance and lithium battery technology, applied in the field of automobile lithium battery charge balance method and balance system, can solve the problems of poor battery balance, unadjustable discharge current, over-discharge, etc., to achieve good charge balance, good effect, accurate and flexible control Effect

Active Publication Date: 2012-07-11
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] (1) Discharge the single battery with relatively high voltage through the bypass resistor, so that the battery pack reaches a balanced state; this balance method will generate power consumption; moreover, the size of the discharge resistor is fixed, and the discharge current cannot be adjusted, which may As a result, some of them are under-discharged or partially over-discharged, which eventually leads to worse battery balance.

Method used

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  • Automobile lithium battery charge balancing method and balancing system
  • Automobile lithium battery charge balancing method and balancing system

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Embodiment 1

[0052] This embodiment discloses a charging balancing method for a lithium battery of an automobile, which is used to balance the difference between individual batteries when the lithium battery pack of the automobile is in a charging state, and the battery pack includes a plurality of single batteries connected in series;

[0053] During the charging process, two DC power supplies are loaded on each single battery for charging: one is an external DC power supply loaded at both ends of the battery pack, for example: a 42V / 10A DC power supply is directly connected to both ends of the battery pack ; The second is the compensation DC power supply loaded on both ends of each single battery, the current size of the compensation DC power supply can be adjusted according to requirements;

[0054] When starting to charge, all the DC compensation power supplies are turned on at full load, and output compensation current of the same size to compensate and charge each single battery. For ...

Embodiment 2

[0062] Such as figure 1 As shown, this embodiment discloses a charging balance system for a lithium battery for an automobile, which is used to balance the difference between individual cells when the lithium battery pack of an automobile is in a charging state. The battery pack 1 includes a plurality of single cells connected in series Body battery 11, and an external DC power supply 7 is charged at both ends of the battery pack 1; the balance system includes: lower computer 2, upper computer 3, switch circuit 5, and DC-DC conversion circuit 4, lower computer 2 Be PLC or single-chip microcomputer, host computer 3 is a main control module that includes CPU, and switch circuit can be field effect tube; The input terminal of described DC-DC direct current conversion circuit 4 is electrically connected with described external DC power supply 7, and its output terminal is connected with each monomer battery 11 through a described switch circuit 5, and each monomer battery 11 is co...

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PUM

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Abstract

The invention belongs to the technical field of power battery management, and particularly discloses an automobile lithium battery charge balancing method and balancing system. The invention provides a method and a system for realizing balance when a battery pack is in a charge state. In the charging process, two DC (direct current) power supplies are loaded to each single battery for charge, wherein one DC power supply is an external DC power supply loaded at the two ends of the battery pack, and the other DC power supply is a compensation DC power supply loaded at the two ends of each single battery; when charging is started, all DC compensation power supplies are started at full load to output the same compensation current for compensative charge to each single battery; and in the charge process, the compensation current at the two ends of the single battery with a relatively high voltage is reduced until the battery pack reaches a balanced state so as to obtain lower energy consumption, higher efficiency and better effect when balancing difference among the single batteries.

Description

technical field [0001] The invention belongs to the technical field of power battery management, and in particular relates to a charging balancing method and a balancing system for an automobile lithium battery. Background technique [0002] In order to meet the voltage, power and energy requirements of high-power equipment such as electric vehicles, the battery pack is mostly composed of a large number of power batteries connected in series. Although the difference between batteries is gradually reduced with the improvement of technology, it is still difficult to ensure that the characteristics of each battery are completely consistent at the current level of manufacturing technology. Especially under working conditions, irregular charging and discharging are frequently carried out, and the difference between the batteries will deteriorate after the battery pack has been working for a period of time, thereby reducing the use efficiency and life of the battery pack. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H02J7/00
CPCY02E60/12Y02E60/10
Inventor 王明旺李武歧李载波
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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