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A high specific power battery formation process

A power battery and process technology, applied in the field of high-performance power battery formation technology, can solve problems such as affecting electrochemical performance, affecting the formation of SEI film on the surface of the negative electrode, and forming voltage affecting the SEI film of the battery, etc., to achieve improved electrical performance and tight spacing. consistent effect

Active Publication Date: 2021-07-30
郑州中科新兴产业技术研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the storage and use of the battery, the SEI film will continue to dissolve and form, especially if the SEI film formed during the formation process is not dense enough and the stability is relatively poor, it will not only affect the initial Coulombic efficiency and self-discharge of the lithium-ion battery. , rate performance and safety performance, and will aggravate the dissolution and formation of the SEI film of the silicon-carbon negative electrode during use, seriously affecting its electrochemical performance, especially the cycle performance and rate performance
In addition, the formation voltage will also affect the formation of the SEI film of the battery, because the formation of the lithium-ion battery is an activation process for the first time. As the charging progresses, the internal voltage of the battery increases and is accompanied by the generation of gas. Once the gas production rate is high , the gas will accumulate in the area near the separator inside the battery, thereby affecting the formation of the SEI film on the surface of the negative electrode

Method used

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  • A high specific power battery formation process
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  • A high specific power battery formation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The above high-specific characteristic battery is formulated, and the specific steps are as follows:

[0032] 1): The first time the battery is retained. The battery is binding, the temperature of the constraint temperature is flat, and the binding force is 1.6MPa / cm. 2 First constrain high temperature 75 ° C, 1.5 h, after constraints at room temperature 20 ° C, 0.5 h, total time 2H;

[0033] 2): Protective / preventive precharge. Precharge with small magnification 0.01c at room temperature 25 ° C, binding force 1.4MPa / cm 2 ; Constrained charging time is not more than 100 min, constraint voltage 3.3V;

[0034] 3): High temperature aging infiltrated. The control ambient temperature is 45 ° C, time 12h; the airbag is folded 50 ° tilted up, the cell is tiled, and the interval 6h is flipped to ensure the adequate infiltration uniform.

[0035] 4): The battery is the second time. Battery uses binding, constrained temperatures, high temperatures, binding force 1.1MPa / cm 2 ;...

Embodiment 2

[0042] 1): The first time the battery is retained. The battery is binding, the warming of the constraint temperature is flat, and the binding force is 0.7MPa / cm. 2 First constrain high temperature 75 ° C, 1.5 h, after constraints at room temperature 20 ° C, 0.5 h, total time 2H;

[0043] 2): Protective / preventive precharge. Precharge at 25 ° C ± 5 ° C in small magnification, 2 ° C ± 5 ° C, binding force 1.4MPa / cm 2 ; Constrained charging time is not more than 100 min, constraint voltage 3.3V;

[0044] 3): High temperature aging infiltrated. The control ambient temperature is 45 ° C, time 12h; the airbag is folded 50 ° tilted up, the cell is tiled, and the interval 6h is flipped to ensure the adequate infiltration uniform.

[0045] 4): The battery is the second time. Battery uses binding, constrained temperatures, high temperatures, binding force 1.1MPa / cm 2 ; Constraint time 2 h, constraint temperature is 65 ° C;

[0046] 5): Low SOC is chemically charged. The constraint t...

Embodiment 3

[0052] 1): The first time the battery is retained. The battery is binding, the temperature of the constraint temperature is flat, and the binding force is 1.0MPa / cm. 2 First constrain high temperature of 60 ° C, 1.0 h, after constraint at room temperature 30 ° C, 0.5H, total time 1.5H;

[0053] 2): Protective / preventive precharge. Precharge at 25 ° C ± 5 ° C in small magnification, ± 5 ° C, binding force 0.6MPa / cm 2 ; Constrained charging time is not more than 100 min, constraint voltage 3.3V;

[0054] 3): High temperature aging infiltrated. The control ambient temperature is 50 ° C, time 20 h; the airbag is folded 50 ° tilted up, the cell is tiled, and the interval 6h is flipped to ensure the adequate infiltration uniform.

[0055] 4): The battery is the second time. Battery uses binding, constrained temperatures, high temperature, binding force 0.8MPa / cm 2 ; Constraint time 3h, constraint temperature 45 ° C;

[0056] 5): Low SOC is chemically charged. The constraint temp...

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Abstract

The present invention provides a formation process of a high specific power battery. Firstly, the battery is leveled for the first time by binding force, temperature, and time, and then protective / preventive charging at room temperature is carried out to firmly establish the foundation of the SEI film; secondly , the battery is leveled for the second time with a certain constraint force, constraint temperature, and constraint time to enhance the flatness and hardness of the battery; finally, use low SOC formation charging to continue to grow to form a stable, dense, and uniform SEI film, and complete the confinement process. High temperature aging method under force. The invention can effectively improve the uniformity of the current during formation, the matching of temperature and pressure, and generate a stable SEI film protective layer, thereby greatly reducing the direct contact between the electrode and the electrolyte, and avoiding the dissolution of metal ions and battery swelling. The electric performance of the battery is improved, and the safety performance of the battery is improved; the prepared battery avoids the formation of black spots on the surface of the pole piece.

Description

Technical field [0001] The present invention relates to a lithium-ion power cell, and more particularly to a high proportional characteristic power battery formation process. Background technique [0002] With the large-scale container storage, outdoor cabinet storage, family energy storage and other series of energy storage products large-scale development, the rapid promotion of smart grid is promoted, the strong growth needs of pure electric vehicles, and the promulgation of new energy car subsidies Implementation, increasing battery energy density has become an urgent need for in-depth research in the battery industry. Both major battery companies are actively developing high-ni-nickel-based three-membered materials, and the battery of silicon-based composites is further improved by increasing the energy density of the power battery. Relevant policies are required to reach the industrial energy density of the power battery to reach 300Wh / kg. The researchers have continuousl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44H01M10/0525
CPCH01M10/0525H01M10/446Y02E60/10
Inventor 刘艳侠高桂红于天恒张涛刘福园赵冲冲马安博
Owner 郑州中科新兴产业技术研究院
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