Formation method for flexibly-packaged power lithium-ion battery

A technology of lithium-ion battery and formation method, which is applied in the field of formation process of high-energy-density pouch power lithium-ion battery, which can solve the problems of incomplete electrochemical reaction, poor wettability between pole piece and electrolyte, etc., and achieve sufficient wettability , Increase the formation pressure and increase the effect of wettability

Active Publication Date: 2019-05-14
SHAANXI J&R FIRE FIGHTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the high energy density ternary lithium-ion battery, the wettability between the pole piece and the electrolyte is poor, and the electrochemical reaction is not complete.

Method used

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  • Formation method for flexibly-packaged power lithium-ion battery
  • Formation method for flexibly-packaged power lithium-ion battery
  • Formation method for flexibly-packaged power lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Inject liquid into the cell, and let the cell stand for 8 hours. Pre-seal the edge, put the cell vertically into the pressure fixture, and charge it according to the following process:

[0034]

[0035] Two seals at a time, vacuum degree ≤ -70KPa. At 35°C, place the cells horizontally for 24 hours.

[0036] Preferably, the steps of secondary pressurized normal temperature charging are as follows:

[0037]

[0038] The parameter requirements of the second and second sealing, the packaging strength is ≥50N / 15mm, and the packaging vacuum is ≤-70KPa.

[0039] The same batch of batteries was randomly divided into two groups, one group was formed by high temperature and normal pressure (existing process)-group A, and one group was obtained according to Example 1 of the present invention-group B, each group had 40 PCS.

[0040]

Embodiment 2

[0042] Same as Example 1, the difference is that the cell is left to stand for 12 hours after liquid injection.

Embodiment 3

[0044] With embodiment 1, the difference is that the steps of charging are as follows:

[0045]

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Abstract

The invention protects a formation process for a high-energy-density flexibly-packaged power lithium-ion battery. The process comprises the steps that liquid is injected into a cell, the cell stands,pre-edge-sealing is performed, and the cell is vertically placed into a pressure fixture; the surface of the cell is pressurized, a certain temperature is set, primary charging is performed on the cell, and pressure, temperature and charging currents are set in a stepped mode; after charging is completed, primary second-sealing is performed, and meanwhile air is pumped while a certain vacuum degree is maintained; and standing, secondary pressurization, normal-temperature charging and secondary second-sealing are performed. According to the formation process, the high-temperature pressurizationformation process is adopted, and compared with normal-temperature normal-pressure formation, sufficient wettability of an electrolyte and an anode/cathode active material is improved, and an electrochemical reaction is benefited; in the last step of primary formation, formation pressure is raised, formation temperature is lowered, the uniformity, compactness and stability of an SEI film generated on the surface of a cathode are improved, generation of a thick interface film is avoided, and internal resistance is lowered; and capacity performance of the cell is enhanced.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to the technical field of lithium-ion batteries, in particular to a formation process of a high-energy-density pouch power lithium-ion battery. Background technique [0002] The formation of lithium batteries is the initial formation of the battery, and the activation of the active material of the battery is a process of energy conversion. The formation of lithium batteries is a very complicated process, and it is also a very important process that affects battery performance, because when Li+ is charged for the first time, Li+ is inserted into graphite for the first time, and electrochemical reactions will occur in the battery. During the first charging process of the battery, it is inevitable to form a thin passivation layer covering the surface of the carbon electrode on the phase interface between the carbon negative electrode and the electrolyte, which is called the solid ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/058
CPCY02E60/10Y02P70/50
Inventor 聂广琼胡琪卉叶志翔耿铁成
Owner SHAANXI J&R FIRE FIGHTING CO LTD
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