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Formation method of soft-pack power lithium-ion battery

A lithium-ion battery and a formation method technology, which is applied in the field of formation technology of high-energy-density soft-pack power lithium-ion batteries, can solve the problems of poor wettability between pole pieces and electrolyte, incomplete electrochemical reaction, etc., and improve the sufficient wettability. , The effect of increasing the formation pressure and reducing the internal resistance

Active Publication Date: 2022-03-08
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 of soft-pack power lithium-ion battery
  • Formation method of soft-pack power lithium-ion battery
  • Formation method of soft-pack 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 claims to protect a formation process of a high-energy-density pouch power lithium-ion battery, which includes the following steps: battery cell injection, battery cell standing, pre-sealing, battery cell vertically placed in a pressure fixture, and battery cell Pressurize the surface, set a certain temperature, and charge the battery cell once. The pressure, temperature and charging current are set in steps. After charging, perform a second seal while maintaining a certain vacuum degree, let it stand, and pressurize the second time. Charging at room temperature, two times and two seals. The formation process of the present invention adopts a high-temperature and pressurized formation process, which improves the sufficient wettability of the electrolyte solution and the positive and negative active materials compared with the normal temperature and pressure formation process, and is beneficial to the electrochemical reaction. In the final step of a formation, increase the formation pressure and reduce the formation temperature to improve the uniformity, compactness and stability of the SEI film formed on the surface of the negative electrode, avoid the formation of a thicker interface film, and reduce the internal resistance. The capacity of the battery cell is increased.

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 Patents(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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