A method of activating a lithium ion battery

A lithium-ion battery and battery technology, applied in secondary batteries, secondary battery charging/discharging, secondary battery repair/maintenance, etc., can solve problems such as battery safety out of control, functional failure of battery packs, etc., and achieve consistency High, restore battery capacity, reduce the effect of internal resistance

Inactive Publication Date: 2019-01-15

青岛恒金源电子科技有限公司

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AI-Extracted Technical Summary

Problems solved by technology

For high-power power sources, several single cells are usually connected in series or in parallel to form a battery pack to work together, and the functional failure...

Abstract

The invention provides a method for activating a lithium ion battery. By overdischarging the lithium ion battery below a conventional discharge cut-off voltage, the electrode material is activated, the internal resistance of the battery is reduced, the polarization of the electrode is eliminated, and the partial charge-discharge capacity of the battery is restored. The method of the invention canactivate the battery whose capacity decreases, restore the capacity of the activated battery to the original capacity, and prolong the cycle life of the battery.

Application Domain

Secondary cells charging/discharging

Technology Topic

Lithium electrodeEngineering +4

Image

Examples

Experimental program(5)
Effect test(1)

Example Embodiment

[0026] Example 1

[0027] The operation method of the battery pack, which includes the following screening and activation steps, and continues the power supply work of the battery pack after the activation step:

[0028] 1) Charge the lithium-ion battery in the battery pack to 3.6V at 0.05C;

[0029] 2) Charge to 4.2V at 0.1C;

[0030] 3) Discharge at 1C to 2.7V;

[0031] 4) Measure the temperature of each single battery and calculate the average temperature;

[0032] 5) Take the battery whose temperature is higher than the average value as the battery to be activated, and continue to over-discharge to the over-discharge cut-off voltage:

[0033] Over-discharge cut-off voltage=2.7-0.1*(single battery temperature/average temperature-1);

[0034] 6) Perform positive and negative alternating pulse current cycles on the battery to be activated for 3 times near its voltage, the magnitude of the positive pulse current and the negative pulse current are the same as 0.1C, the pulse action time is the same as 10s, and the interval is 0s.

Example Embodiment

[0035] Example 2

[0036] The operation method of the battery pack, which includes the following screening and activation steps, and continues the power supply work of the battery pack after the activation step:

[0037] 1) Charge the lithium-ion battery in the battery pack to 3.7V at 0.1C;

[0038] 2) Charge to 4.3V at 0.5C;

[0039] 3) Discharge at 2C to 2.8V;

[0040] 4) Measure the temperature of each single battery and calculate the average temperature;

[0041] 5) Take the battery whose temperature is higher than the average value as the battery to be activated, and continue to over-discharge to the over-discharge cut-off voltage:

[0042] Over-discharge cut-off voltage=2.8-0.8*(single battery temperature/average temperature-1);

[0043] 6) Perform positive and negative alternating pulse current cycles on the battery to be activated for 20 times near its voltage. The magnitude of the positive pulse current and the negative pulse current are the same as 0.2C, and the pulse action time is the same as 60s with an interval of 20s.

Example Embodiment

[0044] Example 3

[0045] The operation method of the battery pack, which includes the following screening and activation steps, and continues the power supply work of the battery pack after the activation step:

[0046] 1) Charge the lithium-ion battery in the battery pack to 3.6V at 0.08C;

[0047] 2) Charge to 4.2V at 0.2C;

[0048] 3) Discharge at 1.5C to 2.7V;

[0049] 4) Measure the temperature of each single battery and calculate the average temperature;

[0050] 5) Take the battery whose temperature is higher than the average value as the battery to be activated, and continue to over-discharge to the over-discharge cut-off voltage, and the cut-off voltage satisfies the following formula:

[0051] Over-discharge cut-off voltage=2.7-0.5*(single battery temperature/average temperature-1);

[0052] 6) The battery to be activated is subjected to positive and negative alternating pulse current cycles 10 times near its voltage. The magnitude of the positive pulse current and the negative pulse current are the same as 0.2C, and the pulse action time is the same as 30s with an interval of 10s.

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Description & Claims & Application Information

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A method of activating a lithium ion battery

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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