Battery sorting method

A battery and sorting technology, which is applied in sorting and other directions, can solve problems such as limitations, inconsistencies that cannot be eliminated, battery cycle life attenuation, etc., to achieve efficient power supply, increase cycle life and charge and discharge performance, and reduce costs.

Active Publication Date: 2017-10-03
威胜能源技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Compared with the battery, the structure of the battery pack is more complicated, rather than the proportion of the battery being enlarged. The production process and use environment of the same type of battery are different, resulting in more or less inconsistencies in the capacity, internal resistance and voltage platform of the battery. Inconsistency, and this inconsistency cannot be eliminated, and the performance of the lithium battery pack is quite demanding on the consistency

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specific Embodiment 1

[0082] Hereinafter, one hundred 26650 lithium iron phosphate batteries with a rated capacity of 3Ah and a nominal voltage of 3.2V are taken as an example to introduce the battery sorting method of the present invention.

[0083] (1) Calculate the instantaneous charging DC internal resistance and instantaneous discharge DC internal resistance of the battery to be sorted, and use the instantaneous charging voltage in the first recording point of the last charging state in a batch of battery charge and discharge cycle data as U 1 , The charging current is set to I 1 , The voltage of the last recording point of the previous shelving state is set to U 0 , Then the instantaneous DC internal resistance R of the battery in this SOC state 1 =(U 1 -U 0 ) / I 1 ; Similarly, the instantaneous discharge voltage in the first recording point of the last discharge state is set to U 2 , The discharge current is set to I 2 , The voltage of the last recording point of the previous shelving state is set...

specific Embodiment 2

[0104] The following uses a 25Ah lithium iron phosphate battery with a rated capacity of 25Ah and a nominal voltage of 3.2V as an example to introduce the battery sorting method of the present invention.

[0105] (1) The battery is sorted for the instantaneous charge and discharge DC internal resistance, and the method for calculating the instantaneous charge and discharge DC internal resistance is the same as that of Embodiment 1. After that, the instantaneous charging and discharging instantaneous resistance data of each batch of batteries in the same state are summarized, and the instantaneous charging DC internal resistance of each battery is divided by the instantaneous discharging DC internal resistance, and the quotient is greater than 1 into a group, namely Batteries with instantaneous charging DC internal resistance greater than instantaneous discharging DC internal resistance are divided into one group; other batteries are divided into another group, as shown in Table 2 ...

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Abstract

The invention provides a battery sorting method. Batteries are sorted through three reference quantities of charging and discharging instantaneous internal resistance, battery capacity, and corresponding voltage values of different SOC of the batteries. The batteries with same parameters can be sorted accurately and reliably, so that the batteries with good conformance are assembled as a battery pack; the cycling life and charging and discharging performance of the matched battery pack are guaranteed so that the battery pack can supply electricity for electrical equipment safely, stably and efficiently; and the cycling life of the battery pack is prolonged, the charging and discharging performance of the battery pack is improved, so that cost of the battery pack is reduced.

Description

Technical field [0001] The invention relates to the technical field of battery detection and sorting, in particular to a battery sorting method. Background technique [0002] As we all know, with the widespread use of fossil fuels, environmental pollution has become a worldwide problem. Disasters such as large areas of smog in the north, urban heat island effect, acid rain, etc. are sounding alarm bells time and time again for mankind. Therefore, with this increasingly serious environmental problem, the goal of finding an environmentally friendly energy source has become urgent. Environmental pollution and energy crisis are spurring 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 received extensive attention because of their extremely high electrical energy conversion efficiency without affecting the environment. At present, from small electrical equipment such as ...

Claims

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Application Information

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IPC IPC(8): B07C5/344
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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