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
4 Cites 2 Cited by

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...
View more

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

  • A method of activating a lithium ion battery

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.

PUM

no PUM

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.

Similar technology patents

Display panel and display device

Owner:WUHAN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD

Classification and recommendation of technical efficacy words

  • Lower internal resistance
  • improve consistency

Solid-state polymer electrolyte and preparation method thereof

ActiveCN105680092AExcellent electrical conductivityLower internal resistance
Owner:SHANDONG YUHUANG NEW ENERGY TECH

Formation method for lithium ion battery

InactiveCN105870508AImprove capacity playLower internal resistance
Owner:CHINA AVIATION LITHIUM BATTERY LUOYANG

Silicon microphone and manufacturing method thereof

InactiveCN101835078Aimprove consistency
Owner:AAC ACOUSTIC TECH (SHENZHEN) CO LTD +1

Combined detector and combined detecting method for switch state of DC ground resistance

InactiveCN1687799AHigh-precision detectionimprove consistency
Owner:NANJING NORMAL UNIVERSITY

Automatic charging and discharging equilibrium device for battery pack

InactiveCN103647327Aimprove consistencyMaintain charge and discharge performance
Owner:INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products