A kind of sorting method of single battery

A single battery and battery technology, applied in sorting and other directions, can solve the problems of capacity limitation, inconsistency that cannot be eliminated, and cycle life of less than 200 times, so as to achieve cost reduction, efficient power supply, increase cycle life and charge and discharge performance Effect

Active Publication Date: 2019-06-07
威胜能源技术股份有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Compared with the single battery, the structure of the battery pack is more complicated, rather than the scale of the single battery. The same type of single battery has differences in the production process and use environment, resulting in more or less capacity, Inconsistency in internal resistance and voltage platform, and this inconsistency cannot be eliminated, and the performance of the lithium battery pack is quite demanding on the consistency of the single battery
[0005] Practice has proved that the actual cycle life of a battery with a single cycle of about 1,000 times is less than 200 times after being grouped.
The reason for this phenomenon is not that the cycle life of a single cell in the battery pack is attenuated to about 200 times, but because the battery pack satisfies safety and the difference in remaining power between the single cells makes the battery pack The capacity of the battery is limited by the single battery with the smallest remaining power and the smallest chargeable power

Method used

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  • A kind of sorting method of single battery
  • A kind of sorting method of single battery
  • A kind of sorting method of single battery

Examples

Experimental program
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Effect test

specific Embodiment 1

[0064] The following uses lithium iron phosphate battery as an example to introduce the sorting method of the single battery according to the present invention.

[0065] (1) Prepare one hundred 26650 lithium iron phosphate batteries with a rated capacity of 3Ah and a nominal voltage of 3.2V. Place the battery in an environment of 25°C, 1 standard atmospheric pressure, and 50% relative humidity until the surface temperature of the battery is at 25°C±2°C, use the battery test system to conduct charge and discharge cycle tests on the battery.

[0066] The working steps of performing charge-discharge cycle test on the battery include:

[0067] The first step: put it on hold for 10 minutes;

[0068] Step 2: Charge with 0.3C constant current to battery cut-off voltage of 3.65V, and then switch to 3.65V constant voltage charge with cut-off current of 0.05C;

[0069] The third step: shelving, time 10 minutes;

[0070] Step 4: Constant current discharge, the discharge current is 0.5...

specific Embodiment 2

[0084] (1) Prepare a 25Ah lithium iron phosphate battery with a rated capacity of 25Ah and a nominal voltage of 3.2V. Place the battery at 20°C, 1 standard atmospheric pressure, and 40% relative humidity, and keep it until the surface temperature of the battery is at 20°C± At 2°C, use the battery test system to conduct a charge-discharge cycle test on the battery.

[0085]Work step settings:

[0086] The first step: put it on hold for 10 minutes;

[0087] Step 2: Charge with 0.5C constant current to battery cut-off voltage of 3.65V, then switch to 3.65V constant voltage charge with cut-off current of 0.05C;

[0088] The third step: shelving, time 10 minutes;

[0089] Step 4: Constant current discharge, the discharge current is 1C;

[0090] The fifth step: cycle, from the beginning of the first step to the end of the fourth step, the number of cycles is three times;

[0091] Step 6: Set aside for 10 minutes;

[0092] Step 7: Charge with 0.5C constant current until the cut-...

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Abstract

The invention provides a cell sorting method. Cells are sorted through three reference quantities of the cell capacity, the charge / discharge instant internal resistance and different cell SOC corresponding voltage values, so that the cells with consistent parameters can be accurately and reliably sorted, the cells with good consistency can be assembled as cell sets, the circulating life and the charge / discharge performances of the mated cell sets are guaranteed, the cell sets can safely, stably and efficiently supply electricity to power use equipment, the circulating life of the cell sets is prolonged, the charge / discharge performances of the cell sets are improved, and the purpose of reducing the costs of the cell sets is achieved.

Description

technical field [0001] The invention relates to the technical field of battery detection and sorting, in particular to a sorting method for single batteries. Background technique [0002] As we all know, with the widespread use of fossil fuels, environmental pollution has become a worldwide problem. Large areas of smog in the north, urban heat island effect, acid rain and other disasters are sounding the alarm for human beings again and again. Therefore, under the increasingly serious environmental problems, the goal of finding an environmentally friendly energy source has become urgent. Environmental pollution and energy crisis are spurring the field of scientific research to find new energy sources to solve these two major problems. [0003] Batteries, as a storage and conversion carrier of electrical energy, have attracted extensive attention because of their extremely high electrical energy conversion efficiency without affecting the environment. At present, from small...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B07C5/344B07C5/02
CPCB07C5/02B07C5/344
Inventor 李霖黎朝晖蒋凯方瑛王康丽胡林李建颖何亚玲陈金玲张玘徐振轩
Owner 威胜能源技术股份有限公司
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