Demonstration process for recovering waste and old dynamic lithium iron phosphate cell in environmental protection mode

A technology of lithium iron phosphate battery and process method, applied in battery recycling, waste collector recycling, battery pack parts and other directions, can solve problems such as no industrialized process route, and achieve the effect of reducing harm and high efficiency

Inactive Publication Date: 2014-05-28
BEIJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the safe treatment and material recovery of lithium iron phosphate power batteries are only in the laboratory research stage, and it is a partial research, and the complete industrialized process route has not yet been developed.

Method used

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  • Demonstration process for recovering waste and old dynamic lithium iron phosphate cell in environmental protection mode
  • Demonstration process for recovering waste and old dynamic lithium iron phosphate cell in environmental protection mode
  • Demonstration process for recovering waste and old dynamic lithium iron phosphate cell in environmental protection mode

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Embodiment 1

[0029] Such as figure 1 As shown, the demonstration process route of the environmentally friendly recycling of hard-shell waste power lithium iron phosphate batteries in this embodiment includes the following steps:

[0030] a) Discharge the battery safely. The discharge device is a high-current charge-discharge instrument. First discharge with a large current, and then discharge with a low current to 0V;

[0031] b) Replace the electrolyte of the discharged battery, pump out the electrolyte in the battery with a vacuum device, then add the solvent DMC to stand still, and then use a vacuum pump to pump out the liquid inside the battery, the pressure is about -0.01MPa.

[0032] c) Distill the waste liquid obtained in step (b), the distillation temperature is 90-105°C, the obtained component is DMC, which can be reused for electrolyte replacement in step b); the remaining component is EC, which is passed through the tail gas absorption device The decomposed harmful gas is remov...

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Abstract

The invention relates to a demonstration process for recovering a waste and old dynamic lithium iron phosphate cell in an environmental protection mode, which belongs to the technical field of recovery of the power lithium iron phosphate cell. The method comprises the following steps: completely discharging the cell, extracting an electrolyte in the cell, adding a certain amount of solvent or displacement liquid, standing for 30 minutes and extracting the inner liquid of the cell, and distilling the extracted electrolyte to obtain the liquid for cycle usage when the electrolyte is displaced. According to the invention, the cell is cut by 1cm at the position along the cell top through a water jet, an electrical core is taken, wherein the steel casing, or aluminium casing or a PP plate can be directly recovered for usage. The anode, the cathode and a diaphragm are separated, and the diaphragm can be directly recovered through cleaning by ethanol. After the anode and the cathode are separated through physical methods such as ultrasound, a copper foil and an aluminium foil can be directly recovered, anode and cathode powder can be reused to be a cell material through high temperature treatment, and the purposes of no waste and no pollution can be reached by recovering the elements through a chemical method.

Description

technical field [0001] The invention belongs to the technical field of recovery of power lithium-ion batteries, and in particular relates to the recovery process of waste lithium iron phosphate steel shells, aluminum shells and pouch battery systems, regeneration and recovery treatment of each part. Background technique [0002] With the rapid development of the electric vehicle industry, the application of power batteries has a broader space. Lithium-ion batteries have received widespread attention because of their high energy density, small size, and light weight; lithium iron phosphate (LiFePO 4 ) materials are more and more used in the field of power batteries because of their better safety and good discharge platform. At present, the batteries on the first generation of electric vehicles or hybrid vehicles have been replaced, and the growth of waste batteries will also go through a rapid process. How to deal with the replaced waste batteries is also a problem that rese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54C22B7/00
CPCC22B7/005H01M10/54H01M50/691Y02E60/10Y02W30/84Y02P10/20
Inventor 纪常伟赵煜娟孙玉成原诚寅杨槐于洋周玉坤张涛曹南海
Owner BEIJING UNIV OF TECH
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