Lithium ion battery formation process and lithium ion battery obtained by same

A lithium-ion battery and process technology, applied in the field of lithium-ion batteries, can solve problems such as poor exhaust in the formation process, affect the formation interface, and poor formation exhaust, so as to improve the consistency of self-discharge screening, reduce the amount of liquid loss in formation, The effect of improving the consistency of capacity

Active Publication Date: 2020-11-03
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the lithium-ion battery formation process has problems such as long production cycle, high production cost, large amount of liquid loss, serious pollution of the liquid injection port, poor exhaust during the formation process, and poor interface between positive and negative electrodes, which seriously affect the production efficiency and power of lithium-ion batteries. performance
[0005] CN107706461A discloses a negative pressure formation method for a power lithium-ion battery. The negative pressure formation method is used to replace the open normal pressure formation method. Although it can facilitate the discharge of lithium-ion battery formation and gas production, the lithium-ion battery is in the peak period of formation and gas production. Using a high vacuum state will easily cause a large amount of electrolyte loss and aff

Method used

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  • Lithium ion battery formation process and lithium ion battery obtained by same
  • Lithium ion battery formation process and lithium ion battery obtained by same
  • Lithium ion battery formation process and lithium ion battery obtained by same

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0047] Example 1

[0048] In this embodiment, the lithium-ion battery adopts a small soft pack battery with high nickel ternary material; figure 1 shown; the test method of the chemical gas production curve is: drainage method; figure 1 It can be seen that the chemical production gas is divided into the following three stages:

[0049] Among them, the first stage: when the battery is below 5% SOC, the gas production rate is faster;

[0050] In the second stage, when the battery is at 5%-15% SOC, the gas production rate slows down;

[0051] In the third stage, when the battery reaches more than 20% SOC, the chemical gas production gradually stops, and the SEI film is basically formed.

[0052] In this embodiment, the formation process includes:

[0053] Standing: The high-nickel ternary material small soft pack battery after liquid injection was allowed to stand for 24 hours at 45°C and normal pressure; and

[0054] Segmented negative pressure formation: The segmented nega...

Example Embodiment

[0060] Example 2

[0061] The difference between this embodiment and Embodiment 1 is that, in the first stage, the negative pressure is -60KPa, and the charge is carried out at a constant current of 0.1C to 15% SOC; and

[0062] In the second stage, the negative pressure is -80KPa, and it is charged to 20% SOC with a constant current of 0.12C; and

[0063] In the third stage, the negative pressure is -40KPa, and it is charged with a constant current of 0.32C to a cut-off voltage of 4.2V;

[0064] Other parameters and conditions are exactly the same as in Example 1.

Example Embodiment

[0065] Example 3

[0066] The difference between this embodiment and Embodiment 1 is that, in the first stage, the negative pressure is -20KPa, and the charge is carried out at a constant current of 0.05C to 5% SOC; and

[0067] In the second stage, the negative pressure is -90KPa, and it is charged to 30% SOC with a constant current of 0.3C; and

[0068] In the third stage, the negative pressure is -20KPa, and it is charged with a constant current of 0.5C to a cut-off voltage of 4.2V;

[0069] Other parameters and conditions are exactly the same as in Example 1.

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Abstract

The invention relates to a lithium ion battery formation process and a lithium ion battery obtained by the lithium ion battery formation process. The lithium ion battery formation process adopts a mode of combining segmented negative pressure and segmented current, and the formation process comprises three stages: in the first stage, the negative pressure is 20-60Kpa, and the lithium ion battery is charged to 5-15% SOC at a constant current of 0.05-1 C; in the second stage, the negative pressure is 80-90 Kpa, and the lithium ion battery is charged to 20%-30% SOC at a constant current of 0.1-0.3 C; in the third stage, the negative pressure is 20-40 Kpa, and the lithium ion battery is charged to a cut-off voltage at a constant current of 0.3-0.5 C. The formation process is beneficial to exhausting in the formation process, reducing the liquid loss, avoiding swelling of the battery cell and improving the formation interface; the process is simple and convenient to operate, short in formation time and convenient to produce, and meanwhile, the formation process adopts one-time full charge, so the interface side reaction of the electrode and the electrolyte is fully carried out, and thecapacity consistency and the self-discharge screening consistency are improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a formation process of lithium ion batteries and the obtained lithium ion batteries. Background technique [0002] Benefiting from the rapid development of new energy vehicles, the power battery industry is ushering in a period of rapid growth. Lithium-ion batteries are ideal high-energy power sources in the future due to their superior characteristics such as high energy density, no memory effect, no pollution, and long cycle life. [0003] In the lithium-ion battery production process, the formation process is an extremely important step. This step is mainly to charge the battery cell for the first time to activate the lithium-ion battery; The negative electrode of the ion battery forms a layer of solid electrolyte interface (SEI) film, thereby preventing the further occurrence of side reactions and reducing the loss of lithium content in the lithium-ion battery, which is im...

Claims

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Application Information

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IPC IPC(8): H01M10/44H01M10/0525
CPCH01M10/446H01M10/0525Y02E60/10
Inventor 刘虎陈利权李倩伟何巍
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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