Formation method of soft-package lithium ion battery with high specific energy

A technology of soft-pack battery and chemical formation method, which is applied in the field of lithium-ion batteries to achieve the effects of inhibiting expansion, reducing damage, and improving appearance

Inactive Publication Date: 2018-06-19
SHANXI CHANGZHENG POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, due to the loose lamination tooling process of the pouch battery, the expansion of the high specific energy negative electrode material will have a negative impact on the formation and exhaust process of the battery. Therefore, it is necessary to be different from the existing formation process. A New Formation Process Compatible with Lithium-ion Soft Pack Power Batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation of pouch laminated battery:

[0042] Positive electrode part: according to the mass ratio of lithium-rich manganese-based solid solution positive electrode material (240mAh / g): SuperP (conductive carbon black): KS-6 (conductive graphite): PVDF (polyvinylidene fluoride) = 92:2:2:4 The material was weighed and dried to remove moisture. Put the powder material into the homogenizer for dry mixing, then add the glue made of PVDF, and stir evenly. Then apply the slurry on both sides of aluminum foil, the density of one side is 200g / m 2 , followed by rolling, slitting, and making into sheets according to the VDA size.

[0043] Negative electrode part: According to silicon oxygen carbon material (gram capacity>700mAh / g): SuperP (conductive carbon black): KS-6 (conductive graphite): SBR (styrene-butadiene rubber): CMC (carboxymethyl cellulose) = 92: The mass ratio of 2:2:1.8:2.2 weighs the materials, except for the SBR emulsion, and dries to remove moisture. Diss...

Embodiment 2

[0052] Preparation of pouch laminated battery:

[0053] Positive electrode part: according to the mass ratio of lithium-rich manganese-based solid solution positive electrode material (240mAh / g): SuperP (conductive carbon black): KS-6 (conductive graphite): PVDF (polyvinylidene fluoride) = 92:2:2:4 The material was weighed and dried to remove moisture. Put the powder material into the homogenizer for dry mixing, then add the glue made of PVDF, and stir evenly. Then apply the slurry on both sides of aluminum foil, the density of one side is 200g / m 2 , followed by rolling, slitting, and making into sheets according to the VDA size.

[0054] Negative electrode part: According to silicon oxygen carbon material (gram capacity>1000mAh / g): SuperP (conductive carbon black): KS-6 (conductive graphite): SBR (styrene-butadiene rubber): CMC (carboxymethyl cellulose) = 92: The mass ratio of 2:2:1.8:2.2 weighs the materials, except for the SBR emulsion, and dries to remove moisture. Dis...

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Abstract

The invention relates to a formation method of a soft-package lithium ion battery with high specific energy. The method comprises the following steps: S1, after the battery is injected / filled with liquid and fully left to stand, charging is performed at a small rate of 0.01-0.05 C for 10-20 h; S2. The charged battery is left to stand for 12-60 h, pumping and sealing are performed under the condition of vacuum degree being minus 0.06 MPa-minus0.09 MPa, and part of an air bag is reserved; S3, the battery is fixed with a clamp and is charged to 4.2-4.7 V at 0.05-0.2 C; S4, pumping and sealing areperformed under the condition of vacuum degree being minus 0.06 MPa-minus 0.09 MPa; S5, discharging is performed to 3.0-1.5 V at 0.05-0.2 C, and small current activation is performed at 0.05-0.2 C for 1-10 weeks in the voltage interval. The method has the beneficial effects that the negative influence brought by gas production of the soft-package battery can be effectively improved, folds of polepieces of the soft-package battery due to gas production and expansion of the pole pieces are reduced, and the safety and electrochemical performance of the battery are improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for forming high specific energy lithium ion soft pack batteries. Background technique [0002] With the rapid development of new energy vehicles in recent years and consumers' demand for long mileage, high specific energy lithium-ion power batteries have become an inevitable trend in the development of power batteries. Since the high specific energy lithium-ion power battery needs to adopt a new battery system to provide higher specific energy, the manufacturing process matching it needs to be optimized and improved on the basis of the existing lithium-ion power battery manufacturing process to improve The safety and electrical performance of high specific energy lithium-ion power batteries can meet the needs of new energy vehicles with high mileage and long life. [0003] The new battery system corresponding to the high specific energy lithium-ion power ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058
CPCH01M10/058Y02E60/10Y02P70/50
Inventor 孙磊安富强
Owner SHANXI CHANGZHENG POWER TECH CO LTD
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