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Lithium iron phosphate battery manufacturing method

A technology of lithium iron phosphate battery and manufacturing method, which is applied in the direction of electrolyte battery manufacturing, final product manufacturing, sustainable manufacturing/processing, etc., can solve the problems of poor low temperature performance, unreachable, decreased discharge capacity, etc.

Inactive Publication Date: 2013-09-18
白科 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, a new lithium-ion battery cathode material - lithium iron phosphate, has been widely used in lithium-ion power batteries for electric vehicles due to its low cost and good safety performance. However, the biggest disadvantage of lithium iron phosphate batteries is: The low-temperature performance is not good. Below zero, the discharge capacity drops sharply. When discharged at minus twenty degrees, the discharge capacity can only reach 70% or even less.

Method used

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  • Lithium iron phosphate battery manufacturing method

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Effect test

Embodiment 1

[0012] Taking the cylindrical IFR26650 power battery as an example, mix the binder of polyvinylidene fluoride with N-methyl-2-pyrrolidone, stir for 3-4 hours, add conductive carbon black, and stir at high speed for 3-4 hours. hour, add lithium iron phosphate, stir at high speed for 2-5 hours, filter and coat, and make a pole piece, assemble with a pole piece made of graphite, inject liquid, seal, use high temperature activation process, temperature 50-85 Degree, shelf time 4-144 hours. In the shelving process after the formation, a high-temperature activation process is adopted, the temperature is 50-85 degrees, the shelving time is 4-144 hours, and the capacity is divided. The lithium iron phosphate battery manufactured according to the present invention is discharged at 0.33C under the condition of minus 20 degrees. , The discharge capacity can reach more than 80%.

Embodiment 2

[0014] Taking the cylindrical IFR32650 power battery as an example, mix the binder of polyvinylidene fluoride with N-methyl-2-pyrrolidone, stir for 3-4 hours, add conductive carbon black, and stir at high speed for 3-4 hours. hour, add lithium iron phosphate, stir at high speed for 2-5 hours, filter and coat, and make a pole piece, assemble with a pole piece made of graphite, inject liquid, seal, use high temperature activation process, temperature 50-85 Degree, shelf time 4-144 hours. Formation, activation at room temperature 20-25 degrees for 4-144 hours, high temperature activation process after volume separation, temperature 50-85 degrees, shelf time 4-144 hours. , The lithium iron phosphate battery manufactured according to the present invention can be discharged at 0.33C under the condition of minus 20 degrees, and the discharge capacity can reach more than 80%.

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Abstract

The invention discloses a lithium iron phosphate battery manufacturing method. The method comprises the following steps of: dosing and coating a lithium iron phosphate material according to a conventional process and manufacturing the lithium iron phosphate material into a pole piece; assembling the pole piece with the pole piece made of graphite together; and injecting liquid for sealing. The method is characterized in that: laying processes after injecting the liquid, forming and grading capacity adopt high-temperature activation processes respectively or at the same time, wherein the temperature is between 50 and 85 DEG C and the laying time is 4 to 144 hours. A lithium iron phosphate battery has high electrical conductivity, high ion diffusion capacity, high low-temperature discharge performance, and a good popularization value.

Description

technical field [0001] The invention relates to the technical field of lithium-ion power batteries, and more specifically relates to a manufacturing method for improving the low-temperature performance of lithium iron phosphate batteries. Background technique [0002] Electric vehicles and new energy vehicles are new milestones in the development of the automobile industry in the 21st century. They have special and far-reaching significance for alleviating the global energy crisis, optimizing environmental protection, and achieving sustainable development. In recent years, a new lithium-ion battery cathode material - lithium iron phosphate, has been widely used in lithium-ion power batteries for electric vehicles due to its low cost and good safety performance. However, the biggest disadvantage of lithium iron phosphate batteries is: The low-temperature performance is not good. Below zero, the discharge capacity drops sharply. When discharged at minus 20 degrees, the dischar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 白科周星夫
Owner 白科
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