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Method for sorting lithium-ion power batteries

A power battery and lithium ion technology, applied in the field of sorting lithium ion power batteries, can solve the problems of consistency and inability to guarantee power batteries, and achieve the effect of convenient use and excellent sorting effect.

Inactive Publication Date: 2012-10-03
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is necessary to detect and sort lithium-ion power batteries before combining them. At present, the sorting of lithium-ion power batteries is mainly based on the method of capacity classification or sorting according to the voltage and current characteristic curves of constant current charging and discharging. For lithium-ion power batteries in a state of high and low fluctuations, such a sorting method will have great limitations, and it cannot guarantee that the sorted power batteries will be consistent in terms of capacity, internal resistance and other characteristics in actual working conditions.

Method used

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  • Method for sorting lithium-ion power batteries
  • Method for sorting lithium-ion power batteries
  • Method for sorting lithium-ion power batteries

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The battery to be sorted is IFP186596 lithium iron phosphate power battery with a rated capacity of 8Ah. according to figure 1 The method steps shown sort battery packs.

[0028] First select the simulated working condition: the charging and discharging simulated working condition adopts the simple simulated working condition proposed in the national standard "QC / T743-2006 Li-ion battery for electric vehicles". 3 (A) Constant current charging until the battery voltage reaches 3.7V, then switch to constant voltage charging, and charge until the current is close to 0.1I 3 Stop charging when the time is up, and discharge under simulated working conditions after standing still for 30 minutes. The specific discharge steps are shown in the table below.

[0029] Simple simulation of charging and discharging stages

[0030]

[0031] Detect lithium-ion power battery: detect and draw the discharge voltage characteristic curve of lithium-ion power battery under simulated wor...

Embodiment 2

[0046]With the method of embodiment 1, the capacity range of the selected battery g, h, i, j is 8790-8810mAh, and its charge and discharge characteristic curve is input into the computer, and the charge and discharge characteristic curve of the battery g is selected as the reference curve, and the constant voltage charging middle The current deviation range at time 2 is ±50mA; the middle moments of each 1I3 discharge stage at 1, 4, 7, 10, and 13 o'clock in the constant current charging stage and the simulated working condition discharge process, and the middle moments of the resting stage at 3, 6, and 9 , 12, and 15 points, the voltage deviation range is ±20mV; the voltage deviation at 5, 8, 11, and 14 points in the middle of each 9I3 discharge stage during the simulated working condition discharge process is ±50mV, such as Figure 5 As shown, the upper limit of voltage I, the lower limit of voltage II, the upper limit of current III, the lower limit of current IV and the refer...

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Abstract

The invention discloses a method for sorting lithium-ion power batteries. The method mainly comprises the steps of: selecting a simulated condition, detecting batteries, storing data, designating a capacity range and reference curve, comparing battery data with a reference, sorting out batteries and so on. The method for sorting the lithium-ion power batteries, disclosed by the invention, has the advantages of simplifying sorting process of the lithium-ion power batteries and being high in sorting quality and convenient to use.

Description

Technical field: [0001] The invention relates to a method for sorting lithium-ion power batteries, in particular to a method for phase-sorting lithium-ion power batteries by utilizing the capacity of the lithium-ion power battery and combining the voltage characteristic curve and the current characteristic curve, and belongs to the technical field of battery detection and sorting. Background technique: [0002] With the gradual realization of the advantages of lithium-ion power batteries, the application range of lithium-ion power batteries (not only single batteries, but also combined batteries) is becoming wider and wider. The lithium-ion power battery pack is assembled from multiple single lithium-ion power batteries. Therefore, only when the characteristic parameters of the single battery capacity, internal resistance, surface temperature, and self-discharge rate of the combined battery pack tend to be consistent, can the battery life be guaranteed. The total capacity of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B07C5/344
Inventor 唐海波卢世刚邹春龙付垚胡博范良涛薛轶
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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