Formation method of lithium iron phosphate battery

A technology of lithium iron phosphate battery and formation method, which is applied in the field of lithium-ion batteries, can solve problems such as impact on battery performance, achieve the effect of improving infiltration effect, improving bulging phenomenon, and lower requirements for formation equipment

Pending Publication Date: 2021-05-04
唐山航天万源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the battery is formed directly after liquid injection, and the pole piece has not been fully infiltrated, which will have a certain impact on the performance of the battery.

Method used

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  • Formation method of lithium iron phosphate battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] After the lithium iron phosphate battery is injected, let it stand at room temperature for 24 hours, and clamp the battery with two tempered glass plates that are about 4mm thicker than the battery body, and the tabs and air pockets are leaked out. Charge it with a current of 0.03C for 16.7h on the chemical conversion cabinet, remove the splint, put the battery air bag up, and let it stand in an oven at 45°C for 48h. After charging to 3.65V, continue to discharge to 2.5V with a current of 0.1C, charge and discharge with a current of 0.5C for a week, and finally maintain 30% of the power. Remove the battery splint, and carry out suction sealing under the condition of vacuum degree of -0.09MPa.

Embodiment 2

[0023] After the lithium iron phosphate battery is injected, let it stand at room temperature for 24 hours, and clamp the battery with two tempered glass plates that are about 4mm thicker than the battery body, and the tabs and air pockets are leaked out. First charge with 0.05C current for 10 hours on the chemical conversion cabinet, remove the splint, put the battery air bag upwards, and let it stand in a 45°C oven for 48 hours. After 3.65V, continue to discharge to 2.5V with a current of 0.3C, charge and discharge with a current of 1C for a week, and finally maintain 30% of the power. Remove the battery splint, and carry out suction sealing under the condition of vacuum degree of -0.09MPa.

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a formation method of a lithium iron phosphate battery. The formation method of the lithium iron phosphate battery comprises the following steps of: after the battery is subjected to liquid injection and standing at normal temperature for 24 hours, clamping the battery by using two clamping plates larger than a battery body to expose a tab and an air bag part; charging the treated battery for 10 h to 16.7 h with the current of 0.03 C to 0.05 C; placing the charged battery in an oven at 40-60 DEG C for standing and aging, recovering at room temperature, fixing the battery by using a clamp, charging the battery to 3.65 V by using a current of 0.1-0.3 C, continuously discharging the battery to 2.5 V by using the current of 0.1-0.3 C, charging and discharging once by using a current of 0.5-1 C, and finally keeping 30% of electric quantity; and performing air exhaust and sealing on the prepared battery under a vacuum condition. The lithium iron phosphate battery obtained by the formation method is obviously long in cycle life, and the swelling ratio of the battery is obviously reduced.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for forming a lithium iron phosphate battery. Background technique [0002] Due to its high energy density, fast charging and discharging, and environmental protection, lithium-ion batteries are widely used in electric vehicles, hybrid vehicles, digital products, mobile communication base stations and other occasions, and have great market demand . Especially the lithium iron phosphate battery has a long cycle life, the positive electrode material is stable and does not decompose, and has safety unmatched by other positive electrode materials, and lithium iron phosphate is rich in resources and highly environmentally friendly. [0003] In the manufacturing process of lithium-ion batteries, formation is a very important process. During the first charging process of lithium-ion batteries, a solid electrolyte film (SEI film) will be formed on the surface of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/058H01M10/0525
CPCH01M10/446H01M10/058H01M10/0525Y02P70/50Y02E60/10
Inventor 刘建伟曾怡
Owner 唐山航天万源科技有限公司
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