Grading method of lithium ion battery

A lithium-ion battery and capacity-division technology, which is applied in the manufacture of secondary batteries, non-aqueous electrolyte batteries, and electrolyte batteries, can solve the problems of inaccurate capacity of lithium-ion batteries and large temperature effects, and achieves short capacity separation time and reduced capacity. Temperature influence, easy to control effect

Active Publication Date: 2017-11-17
CHINA AVIATION LITHIUM BATTERY LUOYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a lithium ion battery capacity division method, which can solve the problem that the existing capacity division method is greatly affected by temperature and the obtained lithium ion battery capacity is inaccurate

Method used

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  • Grading method of lithium ion battery
  • Grading method of lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The capacity division method of the lithium-ion battery of the present embodiment may further comprise the steps:

[0024] 1) Charge the lithium-ion battery to full charge at 20°C in three stages:

[0025] In the first stage, the lithium-ion battery is charged to 3.65V at a constant current of 0.5C and left for 5 minutes;

[0026] In the second stage, the lithium-ion battery is charged to 3.65V at a constant current of 0.1C and left for 5 minutes;

[0027] In the third stage, the lithium-ion battery is charged to 3.65V at a constant current of 0.05C;

[0028] 2) Discharge the fully charged lithium-ion battery at 20°C:

[0029] Discharge the fully charged lithium-ion battery to 2.5V at a constant current of 0.5C, and record the discharge capacity C 1 , placed for 10min;

[0030] Then discharge to 2.5V with a constant current of 0.1C, and record the discharge capacity C 2 ;

[0031] 3) Calculate the split capacity of the lithium-ion battery:

[0032] Add the discha...

Embodiment 2

[0034] The capacity division method of the lithium-ion battery of the present embodiment may further comprise the steps:

[0035] 1) Charge the lithium-ion battery to full charge at 25°C in three stages:

[0036] In the first stage, charge the lithium-ion battery with a constant current of 1C for 1h and leave it for 1min;

[0037] In the second stage, the lithium-ion battery is charged to 3.65V at a constant current of 0.1C and left for 1min;

[0038] In the third stage, charge the lithium-ion battery with a constant current of 0.05C to 3.65V, and let it stand for 10 minutes;

[0039] 2) Discharge the fully charged lithium-ion battery at 25°C:

[0040] Discharge the fully charged lithium-ion battery to 2.5V at a constant current of 1C, and record the discharge capacity C 1 , placed for 5min;

[0041] Then discharge to 2.5V with a constant current of 0.1C, and record the discharge capacity C 2 ;

[0042] 3) Calculate the split capacity of the lithium-ion battery:

[0043...

Embodiment 3

[0045] The capacity division method of the lithium-ion battery of the present embodiment may further comprise the steps:

[0046] 1) Charge the lithium-ion battery to full charge at 30°C in three stages:

[0047] In the first stage, the lithium-ion battery is charged to 3.65V at a constant current of 0.5C and left for 10 minutes;

[0048] In the second stage, the lithium-ion battery is charged to 3.65V at a constant current of 0.1C and left for 10 minutes;

[0049] In the third stage, charge the lithium-ion battery with a constant current of 0.05C to 3.65V, and let it stand for 1min;

[0050] 2) Discharge the fully charged lithium-ion battery at 30°C:

[0051] Discharge the fully charged lithium-ion battery to 2.5V at a constant current of 0.5C, and record the discharge capacity C 1, place for 1min;

[0052] Then discharge to 2.5V with a constant current of 0.05C, and record the discharge capacity C 2 ;

[0053] 3) Calculate the split capacity of the lithium-ion battery:...

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Abstract

The invention relates to a grading method of a lithium ion battery, and belongs to the technical field of secondary battery manufacturing. The grading method of the lithium ion battery comprises the following steps of performing constant-current discharging on the fully-charged lithium ion battery with a current of 0.3-1C until a first discharging cutoff voltage is reached, and placing the lithium ion battery; and performing constant-current discharging with a current of 0.05-0.2C until a second discharging cutoff voltage is reached, wherein the first discharging cutoff voltage is 2.0-2.7V, and the second discharging cutoff voltage and the first discharging cutoff voltage are same. The grading method has the advantages that rapid grading of the lithium ion battery can be achieved, the grading efficiency is high, environmental control energy consumption is low, the temperature influence can be reduced, the grading capacity is more accurate, the grouping consistency of the lithium ion battery is improved, and the grading method is a high-efficiency grading method suitable for mass production of the lithium ion battery.

Description

technical field [0001] The invention relates to a method for distributing capacity of a lithium ion battery, which belongs to the technical field of secondary battery manufacturing. Background technique [0002] The global new energy automobile industry will show a trend of rapid industrialization under the background of continuous maturity of technology and continuous implementation of government support policies. In addition, industries such as electric tools, electric bicycles, and new energy will also maintain a low-carbon economy. Momentum of rapid development. [0003] The voltage of a lithium-ion battery cell is generally 3.0V to 4.2V, and its capacity is limited. When used in the field of electric vehicles, hundreds or even more batteries are usually used in series or in parallel in a certain way. For an energy storage system composed of multiple single lithium-ion batteries, the output energy, output power, and service life of the entire system depend on the batter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/058
CPCH01M10/058H01M10/446H01M10/448Y02E60/10Y02P70/50
Inventor 赵家昊张岩李严李萌萌王延杰
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
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