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A sorting method for lithium-ion power batteries

A power battery and lithium-ion technology, which is applied in the field of battery detection and sorting, can solve the problems of capacity limitation, inconsistency that cannot be eliminated, and cycle life of less than 200 times, so as to reduce costs, increase cycle life and charge and discharge performance, and provide efficient power supply Effect

Active Publication Date: 2019-11-08
WASION GROUP HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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 lithium-ion power battery has differences in the production process and use environment, resulting in more or less capacity of the single battery. , internal resistance and voltage platform inconsistency, and this inconsistency cannot be eliminated, and the performance of the lithium battery pack is quite harsh 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 sorting method for lithium-ion power batteries
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  • A sorting method for lithium-ion power batteries

Examples

Experimental program
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Effect test

Embodiment 1

[0053] Specifically, the following takes the lithium iron phosphate battery as an example to introduce the sorting method of the lithium ion power battery according to the present invention.

[0054] (1) Prepare one hundred 26650 lithium iron phosphate batteries with a rated capacity of 3Ah and a nominal voltage of 3.2V. Place the batteries in an ambient atmosphere of 25°C, 1 standard atmospheric pressure, and 50% relative humidity, and keep them until the battery surface temperature is at 25℃±2℃, use the battery test system to carry out the charge-discharge cycle test on the battery.

[0055] Work step settings:

[0056] Step 1: Set aside for 10 minutes;

[0057] The second step: charge with 0.3C constant current to the battery cut-off voltage of 3.65V, and then switch to 3.65V constant voltage charging, the cut-off current is 0.05C;

[0058] Step 3: Set aside for 10 minutes;

[0059] The fourth step: constant current discharge, the discharge current is 0.5C;

[0060] The...

Embodiment 2

[0075]Example 2: (1) Prepare a 25Ah lithium iron phosphate battery with a rated capacity of 25Ah and a nominal voltage of 3.2V. Place the battery in an ambient atmosphere of 20°C, 1 standard atmospheric pressure, and 40% relative humidity, and keep it until the battery surface temperature At 20°C ± 2°C, use the battery test system to perform a charge-discharge cycle test on the battery.

[0076] Work step settings:

[0077] Step 1: Set aside for 10 minutes;

[0078] The second step: charge with 0.5C constant current to the battery cut-off voltage of 3.65V, and then switch to 3.65V constant voltage charging, the cut-off current is 0.05C;

[0079] Step 3: Set aside for 10 minutes;

[0080] The fourth step: constant current discharge, the discharge current is 1C;

[0081] The fifth step: cycle, from the beginning of the first cycle to the end of the fourth step, the number of cycles is three;

[0082] Step 6: Set aside for 10 minutes;

[0083] Step 7: Charge with 0.5C consta...

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Abstract

The invention provides a sorting method of lithium ion power batteries. According to the sorting method, by means of three reference quantities of the lithium ion power battery capacity, the charge-discharge instant internal resistance and voltage values corresponding to battery different SOCs, the lithium ion power batteries are sorted, the lithium ion power batteries consistent in parameter can be sorted out accurately and reliably so that battery cells good in consistency can be assembled into battery packs, the cycle life and charge-discharge performance of the paired battery packs are guaranteed, and the battery packs can provide electricity for electric equipment safely, stably and efficiently; and the cycle life of the battery packs is prolonged, the charge-discharge performance of the battery packs is increased, and therefore the aim of reducing the cost of the battery packs 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 lithium-ion power 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 again and again for human beings. Therefore, under this increasingly serious environmental problem, the goal of finding an environment-friendly energy source has become urgent. Environmental pollution and energy crisis are driving the scientific research field to find new energy to solve these two problems. [0003] Batteries, as a kind of electric energy storage and conversion carrier, have attracted extensive attention because of their extremely high electric energy conversion efficiency without affecting the environment. At present, from small electrica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B07C5/344
CPCB07C5/344
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 WASION GROUP HLDG
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