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Flexible package lithium battery core formation process

A lithium battery cell and flexible packaging technology, which is applied in the field of flexible packaging lithium battery cell formation technology, can solve the problems of difficulty in realizing industrialization, increase production costs, and high equipment requirements, and achieve the effects of reducing the internal resistance of the battery cell, improving production efficiency, and improving cycle performance.

Inactive Publication Date: 2020-08-21
江西格林德能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the chemical formation method of the lithium-ion battery of the invention can form a relatively uniform SEI film on the electrode surface, which improves the cycle performance of the battery, improves the electrical performance and safety of the battery, but due to the opening chemical formation adopted by the invention, the required equipment The requirements are extremely high and the conditions are harsh, which virtually increases the production cost of the enterprise and makes it difficult to realize industrialization

Method used

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  • Flexible package lithium battery core formation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] S1: Preloading: fully soak the cell after liquid injection, then fix it on the high-temperature chemical forming fixture, apply 0.2MPa pressure for preloading, set the temperature at 60°C, and keep it for 5 minutes;

[0046] S2: The first formation charge: charge the pre-pressed cell to 25% SOC with a constant current of 0.03C, and the pressure is 0.2MPa, and hold the pressure for 3 minutes after completion;

[0047] S3: The second formation charging: the cell is charged at a constant current of 0.1C to 45% SOC, the pressure is 0.4MPa, and the pressure is kept for 60S after completion;

[0048] S4: Pulse charging: pulse discharge the battery for 3S, and put it aside for 5S;

[0049] S5: The third formation charge: the cell is charged to 65% SOC with a constant current of 0.3C, and the pressure is 0.7MPa, then repeat step S4;

[0050] S6: Evacuation packaging curing: lower the high-temperature fixture to room temperature, remove the battery cells, perform degassing pack...

Embodiment 2

[0052] S1: Preloading: fully soak the cell after liquid injection, then fix it on the high-temperature chemical forming fixture, apply 0.2MPa pressure for preloading, set the temperature at 60°C, and keep it for 5 minutes;

[0053] S2: The first formation charge: Charge the pre-pressed cell to 27% SOC with a constant current of 0.04C, and the pressure is 0.2MPa, and hold the pressure for 3 minutes after completion;

[0054] S3: The second formation charging: the cell is charged to 55% SOC with a constant current of 0.3C, and the pressure is 0.5MPa. After completion, the pressure is kept for 60S;

[0055] S4: Pulse charging: pulse discharge the battery for 3S, and put it aside for 5S;

[0056] S5: The third formation charging: the cell is charged to 70% SOC with a constant current of 0.4C, and the pressure is 0.8MPa, then repeat step S4;

[0057] S6: Evacuation packaging curing: lower the high-temperature fixture to room temperature, remove the battery cells, perform degassing...

Embodiment 3

[0059] S1: Preloading: fully soak the cell after liquid injection, then fix it on the high-temperature chemical forming fixture, apply 0.3MPa pressure for preloading, set the temperature at 60°C, and keep it for 5 minutes;

[0060]S2: The first formation charging: charge the pre-pressed cell to 30% SOC at a constant current of 0.05C, and the pressure is 0.2MPa, and hold the pressure for 3 minutes after completion;

[0061] S3: The second formation charging: the cell is charged to 50% SOC with a constant current of 0.2C, and the pressure is 0.4MPa. After completion, the pressure is kept for 60S;

[0062] S4: Pulse charging: pulse discharge the battery for 3S, and put it aside for 5S;

[0063] S5: The third formation charging: the cell is charged to 60% SOC with a constant current of 0.3C, and the pressure is 0.6MPa, and then repeat step S4;

[0064] S6: Evacuation packaging curing: lower the high-temperature fixture to room temperature, remove the battery cells, perform degass...

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Abstract

The invention discloses a flexible package lithium battery core formation process, which at least comprises the following steps: S1, pre-pressing; S2, carrying out first formation charging; S3, carrying out second formation charging; S4, carrying out pulse charging; S5, carrying out third formation charging; and S6, carrying out exhausting, packaging and curing, wherein the S2 comprises charging to 20%-30% SOC at a constant current of 0.02-0.06 C, the S3 comprises charging to 40%-55% SOC at a constant current of 0.1-0.3 C, and the S4 comprises charging to 60%-70% SOC at a constant current of 0.3-0.5 C. According to the invention, gas bubbles between an electrode sheet and a diaphragm can be removed, so that it is ensured that a uniform and stable SEI film is formed on the surface of the electrode sheet, the internal resistance of a battery core is effectively reduced, and the cycle performance of the battery core is improved; and the charging current is increased progressively along with the electric quantity and is only charged to 60-70% SOC, so that the battery core formation time can be shortened, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a process for forming soft-packed lithium batteries. Background technique [0002] Lithium-ion battery is a green, high-energy and environmentally friendly battery. Because of its outstanding advantages such as high energy density, environmental friendliness, no memory effect, long cycle life, and small self-discharge, it is widely used in mobile phone batteries, mobile power supplies, and electric vehicles. s concern. There are many preparation processes for lithium-ion batteries, from batching, coating, rolling, slitting, sheeting to winding, sealing, baking, liquid injection, formation, second sealing, and volume separation, each step of the process affects the lithium-ion battery. performance of ion batteries. Especially the step from preparation to back-end chemical formation process is particularly important. The so-called formation is the proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/058
CPCH01M10/058H01M10/446Y02E60/10Y02P70/50
Inventor 田军李国敏
Owner 江西格林德能源有限公司
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