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Method for equalizing electric quantity of batteries and equalizer

A technology of battery power and equalization method, which is applied to battery circuit devices, current collectors, electric vehicles, etc., and can solve the problems of slow equalization speed, low equalization accuracy, and high cost. The method is simple, the circuit structure is simple, and the cost is low. cheap effect

Active Publication Date: 2011-11-23
CHERY AUTOMOBILE CO LTD
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AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of low equalization accuracy, slow equalization speed, and high cost of equalizers on the market, the present invention provides a battery power equalization method and equalizer to achieve the purpose of improving the equalization speed and equalization accuracy of battery power and reducing costs

Method used

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  • Method for equalizing electric quantity of batteries and equalizer
  • Method for equalizing electric quantity of batteries and equalizer
  • Method for equalizing electric quantity of batteries and equalizer

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Embodiment Construction

[0013] Hereinafter, the present invention will be described in detail with reference to the drawings and examples.

[0014] figure 1 It is a flow chart of the battery power balancing method of the present invention.

[0015] Such as figure 1 As shown, firstly, in step S101, the series-connected single batteries to be balanced in the battery pack are grouped according to an even number of groups, that is, divided into a plurality of battery sub-groups.

[0016] Next, in step S102, the terminal voltage of each battery subgroup is detected, and in step S103, the terminal voltage of each battery subgroup is compared with the terminal voltages of other battery subgroups to determine the difference between the two Whether the value is within the range required by equalization (for example, whether it is less than 0.2V), if yes, execute steps S105-S106, otherwise execute steps S104-S106.

[0017] In step S104, the battery subgroups with high terminal voltages are discharged, and t...

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Abstract

The invention provides a method for equalizing the electric quantity of batteries. The method comprises the following steps of: dividing series single batteries to be equalized into a plurality of battery sub-groups in a mode of taking even batteries as a group; detecting terminal voltages of all battery sub-groups, discharging the battery sub-groups having high voltages, and transferring redundant electric quantity to the battery sub-groups having low voltages to equalize the electric quantity of all battery sub-groups; detecting the terminal voltages of all single batteries in all battery sub-groups, discharging the single batteries having high terminal voltages in all battery sub-groups, and transferring the redundant electric quantity to the single batteries having low terminal voltages in the battery sub-groups to equalize the electric quantity of all single batteries in the battery sub-groups; and cyclically executing equalization of the electric quantity among the groups and equalization of the electric quantity in the groups until the electric quantity of all series single batteries is equalized. Moreover, the invention provides a corresponding equalizer. The method and the equalizer provided by the invention are simple and easy to operate, low in cost, high in equalization speed and high in equalization accuracy.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method for balancing battery power and an equalizer. Background technique [0002] A battery pack is usually composed of multiple cells connected in series. Due to the constraints of the production process, there are differences in the performance of single cells during production. In addition, due to the non-uniformity of the internal environment of the battery pack, the performance difference between the individual cells will increase during the use of the battery pack, thereby affecting the performance of the entire battery pack. Therefore, balance control must be performed among the single cells to reduce the variance among the single cells. [0003] At present, the common working method of battery equalizer is: by collecting the voltage of each single battery, the energy of the high-voltage single battery is transferred to the low-voltage single battery through the ene...

Claims

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Application Information

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IPC IPC(8): H02J7/00
Inventor 邓飞贺朱得亚
Owner CHERY AUTOMOBILE CO LTD
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