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Formation method of lithium iron phosphate battery with square aluminum shell for energy storage

A technology for aluminum shell lithium iron phosphate and batteries, which is applied in the field of formation of lithium iron phosphate batteries, and can solve problems such as the mismatch between formation process and usage system, and battery performance degradation

Active Publication Date: 2020-05-05
SHANGHAI ELECTRICAL GUOXUAN NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of the existing energy storage lithium iron phosphate battery with an aluminum shell that do not match the formation process and the use system, resulting in a decrease in battery performance, and to provide a more suitable and practical formation method for the lithium iron phosphate battery with an aluminum shell , in order to achieve the purpose of stabilizing SEI film formation and improving the cycle life and electrical performance of energy storage batteries

Method used

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  • Formation method of lithium iron phosphate battery with square aluminum shell for energy storage
  • Formation method of lithium iron phosphate battery with square aluminum shell for energy storage

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Experimental program
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Effect test

Embodiment 1

[0025] A method for forming a square aluminum shell lithium iron phosphate battery for energy storage of the present invention comprises the following steps:

[0026] Step 1: Pretreatment before chemical synthesis

[0027] First, measure the moisture content of the 27175200 square aluminum case lithium iron phosphate battery roll core, which is 400ppm; the 96Ah square aluminum case lithium iron phosphate battery (the positive pole is Guoxuan lithium iron phosphate material, and the negative pole is Shanghai Shanshan FSN Artificial graphite material, the diaphragm is Jinli 12+4 single-sided ceramic diaphragm, and the electrolyte is Guangzhou Tianci EGX special electrolyte containing negative electrode film-forming additives) for plugging treatment; the lithium iron phosphate battery after the plugging nail is placed in Put it aside for 12 hours at 45°C in a high-temperature room with a dew point of -45°C, so that the electrolyte can fully infiltrate the positive and negative el...

Embodiment 2

[0034] A method for forming a square aluminum shell lithium iron phosphate battery for energy storage of the present invention comprises the following steps:

[0035] Step 1: Pretreatment before chemical synthesis

[0036]First, measure the moisture content of the 27175200 square aluminum case lithium iron phosphate battery roll core pole piece, which is 380ppm; the 105Ah square aluminum case lithium iron phosphate battery (the positive electrode is Guoxuan lithium iron phosphate material, and the negative electrode is Shanghai Shanshan EP -15 artificial graphite material, the diaphragm is Jinli 12+4 single-sided ceramic diaphragm, and the electrolyte is Guangzhou Tianci EGX special electrolyte containing negative electrode film-forming additives) for plugging nail treatment; the lithium iron phosphate battery after plugging the rubber nail Put it in a high-temperature room with a dew point of -35°C at 60°C for 24 hours, so that the electrolyte can fully infiltrate the positiv...

Embodiment 3

[0042] A method for forming a square aluminum shell lithium iron phosphate battery for energy storage of the present invention comprises the following steps:

[0043] Step 1: Pretreatment before chemical synthesis

[0044] First, measure the moisture content of the 54175200 square aluminum case lithium iron phosphate battery roll core pole piece, which is 420ppm; the 230Ah square aluminum case lithium iron phosphate battery (the positive pole is Guoxuan lithium iron phosphate material, the negative pole is Shanghai Shanshan EP -15 artificial graphite material, the diaphragm is Jinli 12+4 single-sided ceramic diaphragm, and the electrolyte is Guangzhou Tianci EGX special electrolyte containing negative electrode film-forming additives) for plugging nail treatment; the lithium iron phosphate battery after plugging the rubber nail Put it in a high-temperature room with a dew point of -55°C at 40°C for 36 hours, so that the electrolyte can fully infiltrate the positive and negativ...

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Abstract

The invention discloses a formation method of a lithium iron phosphate battery with a square aluminum shell for energy storage. The formation method mainly comprises three steps of high-temperature shelving before formation, two-stage constant-power high-temperature formation and high-temperature aging after formation. The method comprises the steps of 1 high-temperature shelving before formation:firstly, plugging a glue nail into a battery liquid injection port after liquid injection, putting the battery liquid injection port in a high-temperature room for shelving, fully infiltrating a polepiece, stabilizing, pulling out the glue nail, putting on a high-temperature formation cabinet, and vacuumizing; 2 high-temperature constant-power formation: performing two-stage constant-power formation treatment on the pretreated battery in a high-temperature state and a vacuum state; and 3 high-temperature aging: plugging the glue nail into the battery subjected to high-temperature constant-power formation, and carrying out aging treatment under a high-temperature environment condition, so that the film formation on the surface of the negative electrode material is more stable. According to the method, aiming at the use mode and characteristics of the energy storage battery, a high-temperature negative-pressure constant-power formation mode is adopted, so that the SEI film formation stability of the energy storage lithium iron phosphate battery is improved, and large-scale industrial production is easy to realize.

Description

technical field [0001] The invention relates to a formation method of a lithium iron phosphate battery, in particular to a formation method of a square aluminum shell lithium iron phosphate battery for energy storage that improves the SEI film formation stability of the battery. Background technique [0002] In recent years, due to its excellent safety and economy, lithium iron phosphate batteries have been widely used in various energy storage fields at home and abroad. Demonstration applications and commercial applications have been carried out from different aspects such as power generation side, grid side and user side. change. At the same time, most lithium iron phosphate batteries for energy storage on the market are developed from the field of power batteries. Due to the application environment scenarios, usage methods and battery cycle life requirements of energy storage batteries and power batteries, etc. Therefore, it is necessary to develop a battery preparation ...

Claims

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Application Information

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IPC IPC(8): H01M10/44H01M10/058
CPCH01M10/058H01M10/446Y02E60/10Y02P70/50
Inventor 朱春林李送营杨尘李佳
Owner SHANGHAI ELECTRICAL GUOXUAN NEW ENERGY TECH CO LTD
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