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Liquid filling method of lithium ion battery

A lithium-ion battery and liquid injection technology, which is applied in the manufacture of battery pack components, non-aqueous electrolyte batteries, and electrolyte battery manufacturing, etc. The effect of improving safety

Active Publication Date: 2014-03-12
鲍添增
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium-ion batteries form a dense SEI film during the formation stage. If the formed SEI film is not dense and complete, it may affect the charge-discharge performance and cycle performance of the battery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Step 1, the first liquid injection: inject the electrolyte solution A containing vinylene carbonate (VC) into the lithium-ion secondary battery to be injected. After liquid injection, the battery was left at room temperature for 10 hours to fully infiltrate the pole piece and separator. The injection volume is 30% of the total injection weight. The VC mass content in electrolyte A is 8%, the mixed solvent of ethylene carbonate (EC) and ethyl methyl carbonate (EMC) mass ratio is 1:1, the lithium salt is LiBF4, and the lithium salt concentration is 1 mol / L.

[0037] Step 2, formation: age the battery obtained in step 1, seal it with glue and then form it, charge it at a constant current of 0.02C to 3.2V, and hold it for 10 hours.

[0038] Step 3, the second liquid injection: inject the electrolyte B containing vinylene carbonate (VC), and leave it at room temperature for 12 hours. 4%, the solvent is a mixed solvent of ethylene carbonate (EC) and ethyl methyl carbonate (...

Embodiment 2

[0045] Step 1, the first liquid injection: inject the electrolyte solution A containing vinylene carbonate (VC) into the lithium-ion secondary battery to be injected. After liquid injection, the battery was left at room temperature for 10 hours to fully infiltrate the pole piece and separator. The injection volume is 35% of the total injection weight. The mass content of VC in electrolyte solution A is 8%, the solvent is a mixed solvent of ethylene carbonate (EC) and ethyl methyl carbonate (EMC) with a mass ratio of 1:1, the lithium salt is LiBF4, and the lithium salt concentration is 1 mol / L .

[0046] Step 2, formation: age the battery obtained in step 1, seal it with glue and then form it, charge it at a constant current of 0.02C to 3.2V, and hold it for 10 hours.

[0047] Step 3, the second liquid injection: inject the electrolyte solution B containing vinylene carbonate (VC), and leave it at room temperature for 12 hours, and the injected liquid volume is 25% of the tot...

Embodiment 3

[0054] Step 1, the first injection: inject the electrolyte A containing vinylene carbonate (VC) into the lithium-ion secondary battery to be injected. After liquid injection, the battery was left at room temperature for 10 hours to fully infiltrate the pole piece and separator. The injection volume is 40% of the total injection weight. The mass content of VC in electrolyte A is 8%, the solvent is a mixed solvent of ethylene carbonate (EC) and ethyl methyl carbonate (EMC) with a mass ratio of 1:1, the lithium salt is LiPF6, and the lithium salt concentration is 1 mol / L .

[0055] Step 2, formation: age the battery obtained in step 1, seal it with glue and then form it, charge it at a constant current of 0.02C to 3.2V, and hold it for 10 hours.

[0056] Step 3, the second liquid injection: inject the electrolyte solution B containing vinylene carbonate (VC), and leave it at room temperature for 12 hours, and the injected liquid volume is 30% of the total injected liquid mass. ...

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PUM

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Abstract

The invention relates to a manufacturing technology of a lithium ion battery and in particular relates to a liquid filling method of the lithium ion battery. The method comprises the following steps: 1, filling a lithium ion secondary battery to be filled with liquid with an electrolytic solution A containing vinylene carbonate for the first time, wherein the liquid filling quantity is 30%-45% by mass of the total liquid filling quantity; 2, forming; 3, filling the lithium ion secondary battery with an electrolytic solution B containing vinylene carbonate for the second time, wherein the liquid filling quantity is 25%-35% by mass of the total liquid filling quantity; 4, forming; 5, filling the lithium ion secondary battery with an electrolytic solution C containing vinylene carbonate for the third time, wherein the liquid filling quantity is 15%-25% by mass of the total liquid filling quantity; 6, forming; 7, filling the lithium ion secondary battery with an electrolytic solution D for the fourth time, wherein the liquid filling quantity is 10%-20% by mass of the total liquid filling quantity; 8, ageing and performing secondary encapsulation to obtain the lithium ion battery. According to the liquid filling method, the battery is promoted to form a stable and dense SEI (solid electrolyte interface) film, the charging frequency of the battery can be effectively increased, and the service life of the battery can be effectively prolonged.

Description

technical field [0001] The invention relates to a manufacturing technology of a lithium ion battery, in particular to a liquid injection method for a lithium ion battery. Background technique [0002] Compared with lead-acid batteries, nickel-metal hydride batteries, and nickel-cadmium batteries, lithium-ion batteries have the advantages of higher energy density, small self-discharge, and long cycle life, and have been widely used in the field of consumer electronics. [0003] Electrolyte is an important part of lithium-ion batteries. It is the carrier and medium for the transmission of lithium ions between the positive and negative electrodes, and also provides lithium ions. The conductivity of the electrolyte is one of the important parameters of the electrolyte, which has an important impact on the performance of the specific capacity and rate of the electrode active material. [0004] The currently commonly used lithium-ion battery electrolyte uses LiPF6 as the solute,...

Claims

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Application Information

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IPC IPC(8): H01M2/36H01M50/609
CPCH01M10/058H01M50/60Y02E60/10
Inventor 鲍添增秦怀鹏
Owner 鲍添增
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