Sorting and grouping method for lithium ion power batteries

A power battery and lithium-ion technology, which is applied in the field of lithium-ion power battery sorting and matching groups, can solve problems such as large demand, low battery sorting efficiency and pass rate, and battery group consistency that cannot meet customer expectations. To achieve the effect of improving charge and discharge performance and cycle life

Active Publication Date: 2017-12-26
CHINA AVIATION LITHIUM BATTERY LUOYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the matching methods for power batteries mainly include: single-parameter matching method, multi-parameter matching method, and dynamic characteristic (curve) matching method, etc., which have a large demand for resources such as equipment, manpower, and electricity, especially for multiple and multiple batteries. String battery packs, battery sorting efficiency and pass rate are low, and the consistency of battery packs after sorting cannot meet the gradually increasing customer expectations

Method used

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  • Sorting and grouping method for lithium ion power batteries
  • Sorting and grouping method for lithium ion power batteries
  • Sorting and grouping method for lithium ion power batteries

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The lithium-ion power battery sorting and matching method of the present embodiment includes the following steps, such as figure 1 Shown:

[0036] 1) According to static parameters such as capacity, voltage, internal resistance, and production date, select batteries that are more than 10% of the required number of batteries, and the capacity difference can be selected according to the number of batteries connected in parallel. 500 qualified batteries within the same month (internal resistance and voltage within the qualified range); the lithium-ion power battery used in this embodiment is a lithium iron phosphate battery with a single capacity of 72Ah;

[0037] 2) Use special probe equipment 1 to connect 500 batteries in series, charge at a charging rate of 0.5C until the voltage of the single battery is 3.6V, and then charge at a constant voltage of 3.6V until the current is 0.15C and stop charging;

[0038] Record the time and voltage data of the charging process;

...

Embodiment 2

[0044] The lithium-ion power battery sorting and matching method of the present embodiment includes the following steps, such as figure 2 Shown:

[0045] This matching method is applicable to any series-parallel battery matching group, and the effect of multi-parallel multi-string battery matching is better. The battery grouping method required in this embodiment is 2 and 203 strings; the lithium ion battery used The power battery is a lithium iron phosphate battery with a single capacity of 74Ah;

[0046] 1) According to static parameters such as capacity, voltage, internal resistance and production date, select batteries that are more than 10% of the required number of batteries. The capacity difference can be selected according to the number of batteries connected in parallel. Select a capacity difference ≤ 2Ah, and the production date is within the same month 480 batteries;

[0047] 2) Use special probe equipment 1 to connect 480 batteries in series, charge at a chargin...

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Abstract

The invention relates to a sorting and grouping method for lithium ion power batteries and belongs to the technical field of lithium ion power batteries. The sorting and grouping method comprises the following steps that (1) the to-be-sorted single batteries are connected in series and charged till the voltage of the single batteries reaches a charging cut-off voltage, and the charging time and voltage data of the single batteries in the charging process are recorded; (2) the charged single batteries in the step (1) are connected in parallel and charged till the SOC of each single battery is 100%, then the charged single batteries are aged at the normal temperature, and voltage data of the single batteries before and after aging are recorded; (3) the aged single batteries in the step (2) are connected in series and discharged to a set voltage in a constant-current mode, and the discharging time and voltage data of the single batteries in the discharging process are recorded; and (4) the single batteries are screened in consistency according to the data recorded in the step (1), the step (2) and the step (3), then the screened single batteries are grouped. According to the sorting and grouping method, a battery group high in consistency can be sorted.

Description

technical field [0001] The invention relates to a method for sorting and grouping lithium-ion power batteries, which belongs to the technical field of lithium-ion batteries. Background technique [0002] As the power source of electric vehicles and energy storage power sources, the power battery pack is generally used by combining hundreds or thousands of single batteries in a certain series-parallel mode to form a battery module. Among them, during the production process of single cells, due to differences or fluctuations in factors such as raw materials, manufacturing processes, production equipment, and the environment, there are certain differences in the performance of the produced single cells. When single cells are used in groups, the difference in performance between individual cells will lead to serious consequences such as reduced capacity of the battery pack, shortened lifespan, and even fire and explosion. Therefore, in order to improve the performance of the po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B07C5/344H01M10/42
CPCB07C5/344H01M10/4207Y02E60/10
Inventor 王迎迎温灿国付书阁
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
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