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Simple battery pack battery equalization method

An equalization method and battery equalization technology, applied in battery circuit devices, current collectors, electric vehicles, etc., can solve the problems of poor equalization effect and complex equalization method, and achieve the effects of short equalization time, improved cycle life and low energy consumption

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 problems of poor equalization effect and complex equalization method of lithium iron phosphate and other lithium-ion battery packs, in the present invention, it is hoped to provide a simple battery pack battery equalization method, which can effectively balance the battery pack cells and prolong the life of the battery pack. cycle life

Method used

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  • Simple battery pack battery equalization method
  • Simple battery pack battery equalization method
  • Simple battery pack battery equalization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025]Sixteen 3.2V105Ah lithium iron phosphate batteries are connected in series to form a battery pack, and it is equipped with a management system board and a battery voltage acquisition board with a balance module. The maximum charging voltage allowed for a single cell in a battery pack is 3.65V, and the minimum discharge voltage is 2.50V; the voltage of a single cell during cycling is limited to a charging voltage of 3.60V and a discharging voltage of 2.85V. Balance setting: V S 2.85V, V E is 2.5V, the equalizing current I J The minimum value is 3A (0.03CA), and the power consumption resistance R is 0.12Ω. According to the first batch of even-numbered batteries and the other batch of odd-numbered batteries, each battery is discharged and balanced. The battery pack is charged and discharged cycle test in the range of 45.6-57.6V with a current of 100A. The test results: the first discharge of the battery pack is 100Ah; the discharge capacity of the battery pack at the 200t...

Embodiment 2

[0027] Connect 32 3.2V105Ah lithium iron phosphate batteries in series to form a battery pack. First, 16 batteries form a module, and then 2 modules are connected in series to form a battery pack. The battery pack is equipped with a management system board and each module has a battery voltage acquisition board with a balancing module. The maximum charging voltage allowed for a single cell in a battery pack is 3.65V, and the minimum discharge voltage is 2.50V; the voltage of a single cell during cycling is limited to a charging voltage of 3.60V and a discharging voltage of 2.85V. Balance setting: V S 2.85V, V E is 2.6V, the balance current I J The minimum value is 2A (0.02CA), and the power consumption resistance R is 0.12Ω. According to the first batch of batteries with an even serial number, and the other batch with an odd serial number, each battery is discharged and balanced. The battery pack is charged and discharged cycle test in the range of 91.2-115.2V with a curre...

Embodiment 3

[0029] Connect 32 pieces of 3.6V33Ah lithium-nickel-manganese-cobalt oxide lithium-ion batteries in series to form a battery pack. First, 16 batteries form a module, and then 2 modules are connected in series to form a battery pack. The battery pack is equipped with a management system board and a battery voltage acquisition board with a balance module for each module. 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 3.00V. Balance setting: V S 3.00V, V E is 2.85V, the equalizing current I J The minimum value is 2A (0.07CA), and the power consumption resistance R is 0.075Ω. According to the first batch of batteries with an even serial number, and the other batch with an odd serial number, each battery is discharged and balanced. The battery pack is charged and discharged cycle test ...

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Abstract

The invention provides a simple battery pack battery equalization method which comprises regular equalization: during equalizing, a battery pack discharges until a minimum-voltage single battery reaches a voltage VS of a low-voltage area; and a battery management system starts discharge equalization modules in interval sequence for all batteries forming a battery pack so as to discharge the batteries to the voltage VS with an equalizing current IJ and enable the voltage of all batteries to be VE. The simple battery pack battery equalization method comprises regular, low-voltage area and large equalizing current discharge, battery interval-sequence equalization, and simple management system and equalization strategy, can enable battery pack equalization energy consumption to be low, and the required equalization time to be short and effectively, and improves the cycle life of the battery pack.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a simple method for balancing cells in a battery pack. 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 battery, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
Inventor 庄新国
Owner 庄新国
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