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A making method for lithium ion secondary cell

A lithium-ion battery and secondary battery technology, which is applied in secondary batteries, secondary battery repair/maintenance, secondary battery charging/discharging, etc., can solve the problem that the formation of ideal SEI film is not easy to control, battery cycle performance is not ideal, Long formation time and other problems, to solve the gas entrained electrolyte overflow, shorten the formation time, prolong the life of the effect

Inactive Publication Date: 2007-11-28
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects that the existing lithium-ion battery is formed for a long time, the formation of the ideal SEI film is not easy to control, resulting in unsatisfactory cycle performance of the battery, and to provide a fast, easy to obtain flexible SEI film and Formation method of lithium-ion secondary battery that makes battery have good cycle performance

Method used

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  • A making method for lithium ion secondary cell
  • A making method for lithium ion secondary cell
  • A making method for lithium ion secondary cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This embodiment illustrates the formation method of the lithium ion secondary battery provided by the present invention.

[0037]Place the lithium-ion battery with the model LP053048A1 after liquid injection in a stainless steel rigid sealed tank that can withstand a pressure of 1.5 MPa, fill the sealed tank with argon within 1 minute until the pressure in the tank is 0.6 MPa, and then release the gas to Atmospheric pressure, repeated twice. Refill argon until the air pressure in the tank is 0.2 MPa, and then open the lithium-ion battery for formation. The condition of formation is to charge at 34 mA for 2 hours at a voltage of 4.2 volts, and then charge at a current of 67 mA. Stop charging after 3 hours of charging. After 10 minutes, the airtight jar was vented to normal pressure, and the liquid injection hole of the battery was sealed.

Embodiment 2

[0039] This embodiment illustrates the formation method of the lithium ion secondary battery provided by the present invention.

[0040] The lithium ion battery of the model after liquid injection is LP053048A1 is placed in the same rigid airtight can as in Example 1, and ethylene gas is filled in the airtight can to the air pressure in the can to 0.6 MPa within 1 minute, and then, the gas is released to normal Press, repeat twice. Fill the tank with ethylene gas until the pressure in the tank is 0.2 MPa, and then open the lithium-ion battery for formation. The conditions for formation are to charge at 34 mA for 2 hours at a voltage of 4.2 volts, and then charge at 67 mA. Stop charging after 3 hours. After 10 minutes, the airtight jar was vented to normal pressure, and the liquid injection hole of the battery was sealed.

Embodiment 3

[0042] This embodiment illustrates the formation method of the lithium ion secondary battery provided by the present invention.

[0043] The model after liquid injection is the lithium ion battery of LP053048A1 and is placed in the same rigid airtight jar as embodiment 1, fills propylene gas in the airtight jar in 5 minutes to the air pressure in the jar to be 0.6 MPa, then, deflate to normal Press, repeat twice. Fill the tank with propylene gas until the pressure in the tank is 0.2 MPa, and then open the lithium-ion battery for formation. The conditions for formation are to charge at a charging current of 34 mA for 2.5 hours at a voltage of 4.2 volts, and then charge at a current of 67 mA. Stop charging after 4 hours of charging. After 10 minutes, the airtight jar was vented to normal pressure, and the liquid injection hole of the battery was sealed.

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Abstract

The invention discloses a forming method of secondary battery of lithium ion, which is characterized by the following: opening to form the lithium ion battery with pressure between 0.1Mpa and 1Mpa; inhibiting the gas from generating; solving the overflow problem for gas with electrolyte; inhibiting the decomposition of lithium salt; fitting for generating organic lithium salt; accelerating the flexible SEI film with shorter forming time to affirm the good circulating property; lengthening the life of lithium ion battery.

Description

technical field [0001] The invention relates to a method for forming a battery, in particular, the invention relates to a method for forming a lithium ion secondary battery. Background technique [0002] The formation step of lithium-ion rechargeable batteries is an important stage in the manufacture of batteries. The formation is related to the quality of the battery's capacity, cycle life, and safety performance. Formation is the process of charging a battery for the first time. There are mainly two ways of formation of the existing lithium-ion secondary batteries, sealed formation and open formation. Sealing formation is to seal the liquid injection hole after injecting the electrolyte, and then carry out battery formation. During the formation process, hydrogen fluoride, carbon monoxide, carbon dioxide and other gases will be generated. These gases will accumulate inside the battery and cause the battery to expand and the shell to bulge. , deformation, or even cause th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/38H01M10/058
CPCY02E60/10Y02P70/50
Inventor 胡刚董俊卿
Owner BYD CO LTD
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