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A kind of negative pressure formation method and battery

A formation method and negative pressure technology, applied in negative pressure formation method and battery field, to achieve the effects of reduced internal resistance, good cycle performance, and accelerated growth rate

Active Publication Date: 2021-11-23
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, the above two existing solutions need to further improve the battery performance after formation and reduce the formation time

Method used

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  • A kind of negative pressure formation method and battery
  • A kind of negative pressure formation method and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] The present embodiment carries out negative pressure formation according to the following method:

[0076] (1) At the formation temperature of 45°C, let the semi-finished cell stand for 15 minutes, vacuumize the semi-finished cell to a vacuum of -90KPa, keep the vacuum constant, and charge it to 3V with a constant current of 0.05C ;

[0077] (2) Stand still for 15 minutes and reduce the vacuum degree to -70KPa, keep the vacuum degree constant, and charge it to 3.4V with a constant current of 0.1C;

[0078] (3) Stand still for 15 minutes and reduce the vacuum degree to -50KPa, keep the vacuum degree constant, and charge it to 3.8V with a constant current of 0.3C;

[0079] (4) Stand still for 15 minutes and reduce the vacuum degree to -25KPa, keep the vacuum degree constant, charge with a constant current of 0.5C to 4V, and then change to charge with a constant voltage of 4V until the current reaches the cut-off current of 0.05C, Stop charging, let it stand for 15 minut...

Embodiment 2

[0084] The present embodiment carries out negative pressure formation according to the following method:

[0085] (1) At the formation temperature of 90°C, let the semi-finished cell stand for 1 min, vacuumize the semi-finished cell to a vacuum degree of -80KPa, keep the vacuum constant, and charge it with a constant current of 0.03C to 2.8 V;

[0086] (2) Stand for 1min and reduce the vacuum degree to -60KPa, keep the vacuum degree constant, and charge to 3.0V with a constant current of 0.1C;

[0087] (3) Stand still for 1min and reduce the vacuum degree to -40KPa, keep the vacuum degree constant, and charge to 3.5V with a constant current of 0.2C;

[0088] (4) Stand still for 1min and reduce the vacuum degree to -10KPa, keep the vacuum degree constant, charge with a constant current of 0.3C to 3.7V, and then change to constant voltage charge with this voltage until the current reaches the cut-off current of 0.04 C, stop charging, let it stand for 1min, and get the battery ...

Embodiment 3

[0092] The present embodiment carries out negative pressure formation according to the following method:

[0093] (1) At the formation temperature of 40°C, let the semi-finished cell stand for 30 minutes, vacuumize the semi-finished cell to a vacuum degree of -100KPa, keep the vacuum constant, and charge it with a constant current of 0.07C to 3.2 V;

[0094](2) Stand still for 30 minutes and reduce the vacuum degree to -80KPa, keep the vacuum degree constant, and charge it to 3.7V with a constant current of 0.3C;

[0095] (3) Stand still for 30 minutes and reduce the vacuum degree to -60KPa, keep the vacuum degree constant, and charge it with a constant current of 0.5C to 4.0V;

[0096] (4) Stand still for 30 minutes and reduce the vacuum degree to -40KPa, keep the vacuum degree constant, charge with a constant current of 1.0C to 4.3V, and then change to constant voltage charge with this voltage until the current reaches a cut-off current of 0.06 C, stop charging, let it sta...

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Abstract

The invention discloses a negative pressure forming method and a battery. The method comprises the following steps: vacuumizing, charging and standing the semi-finished electric core to obtain the formed electric core; the vacuuming and charging are carried out in multiple steps, and the vacuum degree between each step is gradually reduced and the charging current is gradually increased big. The method provided by the invention can shorten the formation time, reduce the liquid loss during the formation process, improve the consistency and stability of the SEI film, improve the cycle performance of the battery, and meet the requirements of high specific energy, fast charging, and long life of the power battery for new energy vehicles. It is especially suitable for the formation of lithium-ion batteries.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and relates to a formation method and a battery, in particular to a negative pressure formation method and a battery. Background technique [0002] Benefiting from the country's incentive policies for new energy vehicles and the expansion of the production and sales of new energy vehicles, the power battery market has maintained continuous growth. It is the goal pursued by the power battery manufacturing industry to meet the needs of high specific energy, fast charging, and long life of power batteries for new energy vehicles, and to make electric vehicles meet the conditions of use close to fuel vehicles. In the production and manufacturing process of power batteries, formation is undoubtedly a key step. The formation of lithium-ion batteries is to electrochemically react with the electrode material and electrolyte at the solid-liquid interface during the first charge and discharge proce...

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 赵东妮李恒沈军才
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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