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Large-equalizing-current battery pack equalization method

A technology of equalizing current and equalizing method, which is applied in the direction of battery circuit devices, current collectors, electric vehicles, etc., and can solve the problems of low equalization efficiency and effect of battery packs

Inactive Publication Date: 2015-12-09
庄新国
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of low battery equalization efficiency and effect, the present invention hopes to provide a battery pack equalization method with large equalization current. The equalization device is placed outside, and the equalization is set in the low voltage area of ​​the battery, and the large equalization current is used to make all the batteries close to empty. to balance the battery

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0023] Connect 16 3.2V105Ah lithium iron phosphate batteries in series to form a battery pack, and it is equipped with a management system board and a port for equalization. The charging voltage of the battery pack cell is limited to 3.65V, and the discharge voltage is 2.50V; the cell voltage of the battery is limited to 3.60V during the cycle, and the discharging voltage is V S is 2.85V. The battery pack is charged and discharged cycle test in the range of 45.6-57.6V with 100A current. The test result: the battery pack is discharged 100Ah for the first time; after 200 cycles, the measured discharge capacity of the battery pack is 95.6Ah. Connect an external balancing device to the battery pack for cell balancing. Balance setting: V E is 2.5V, the equalizing current I J The minimum value is 10A (0.1CA), according to the first batch of even-numbered batteries and the other batch of odd-numbered batteries, discharge equalization for each battery. The battery pack is balance...

Embodiment 2

[0025] Two sets of battery modules equipped with a management system board, a voltage acquisition board, and a port for equalization, and 16 3.6V33Ah nickel-manganese-cobalt lithium-ion batteries in series are connected in series to form a battery pack. The maximum charging voltage allowed for a single cell in a battery pack is 4.20V, and the minimum discharge voltage is 2.85V; the voltage of a single cell during cycling is limited to a charging voltage of 4.10V, and a discharging voltage of V S is 3.00V. The battery pack is charged and discharged cycle test in the range of 96.0-131.2V with a current of 30A. The test results: the first discharge of the battery pack is 30Ah; the discharge capacity of the battery pack for the 200th cycle is 28.5Ah, Connect an external equalizer to the battery pack for equalization. Balance setting: V E is 2.85V, the equalizing current I J The minimum value is 3.6A (0.12CA), according to the first batch of even-numbered batteries and the othe...

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Abstract

The invention provides a large-equalizing-current battery pack equalization method which is characterized by, in a battery low-voltage area, utilizing externally-arranged equalizing devices to enable all batteries to discharge to VE with a large equalizing current IJ, and allow the batteries to be close to empty, thereby realizing equalization of the batteries of a battery pack. The equalizing action is realized in the battery low-voltage area; and the externally-arranged equalizing devices are used to allow all the batteries to realize quick and effective equalization through the equalizing method of allowing the batteries to be close to empty with the large equalizing current, so that temperature rise in the battery pack is not caused, and the cycle life of the battery pack is improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for equalizing a battery pack with a large equalizing current. Background technique [0002] Lithium-ion batteries have high voltage, high specific energy and environmental protection, and are widely used in portable consumer electronics products. The battery packs composed of them are gradually used in electric vehicles and energy storage systems. [0003] Lithium-ion battery packs used in systems such as electric vehicles and energy storage must have a high voltage, even as high as 600 volts, require about 200 batteries in series, and require a service life of more than 10 years. The cycle capacity of the lithium-ion battery pack is expressed as the discharge capacity C of the battery pack after N cycles n Reduced to initial discharge capacity C 0 D% (D% is usually 70-80%). The discharge capacity of a certain battery pack depends on the charging capacity of the ...

Claims

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Application Information

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IPC IPC(8): H02J7/00
Inventor 庄新国
Owner 庄新国
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