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Filling and activating method for flexible-packaging lithium ion battery

A lithium-ion battery and activation method technology, which is applied in the field of liquid injection activation of soft-packed lithium-ion batteries, can solve the problems of low infiltration efficiency and achieve the effects of accelerating infiltration speed, reducing viscous resistance, and reducing viscosity

Active Publication Date: 2012-08-22
NINGDE AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to: address the deficiencies of the prior art, and provide a method for injecting and activating soft-packed lithium-ion batteries that can promote the electrolyte to quickly infiltrate the electrode diaphragm, so as to overcome the deficiencies of the low infiltration efficiency in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of the anode plate: add graphite, conductive carbon, sodium carboxymethyl cellulose and styrene-butadiene rubber into solvent water according to the mass ratio of 94.5:1.5:1.5:2.5, mix and stir evenly to make a stable slurry, and then use metal copper The foil is the current collector, and the slurry is coated on the copper current collector to form a membrane. An anode sheet with a diameter of about 20.3 mm was prepared by a die-cutting cutter.

[0031] Preparation of the cathode electrode sheet: add lithium cobaltate, conductive carbon, and binder into the solvent NMP according to the mass ratio of 95.5:2.2:2.3, mix and stir evenly to make a stable slurry, and then use metal aluminum foil as the current collector. coated on the aluminum current collector. A cathode sheet with a diameter of about 14.3 mm was prepared with a die-cutting cutter.

[0032] Electrolyte preparation: the LiPF 6 Dissolved in a solvent containing EC, DEC, and EMC (the volume rati...

Embodiment 2

[0038] The difference from Example 1 is the liquid injection activation method: after winding the cathode pole piece, anode pole piece and separator into a battery cell, heat the battery core to 40°C and wait for liquid injection; secondly, heat the electrolyte before liquid injection to 80°C; then place the cell in an aluminum-plastic film bag for top / side sealing, clamp the cell with a 5N side thrust when injecting liquid, and place the cell in a vacuum-sealed chamber of -10KPa. During the liquid injection process, keep the negative pressure for 60 seconds, and then place the cell with the opening facing upwards in a sealed chamber with a positive air pressure of 2MPa, and seal the cell air bag after maintaining the pressure for 3 seconds. Then, apply 200000N side thrust to the cell to squeeze-release-re-squeeze cycle once. Finally, place the cell in a 120°C oven and bake for 5 minutes, and then proceed to chemical formation after the cell cools down.

[0039] Anode analysi...

Embodiment 3

[0042] The difference from Example 1 is the liquid injection activation method: after winding the cathode pole piece, anode pole piece and separator into a battery cell, heat the battery core to 80°C and wait for liquid injection; secondly, heat the electrolyte before liquid injection to 60°C; then place the cell in an aluminum-plastic film bag for top / side sealing, clamp the cell with a 10,000N side thrust when injecting liquid, and place the cell in a vacuum-sealed cavity of -80KPa. During the liquid injection process, keep the negative pressure for 10 seconds, and seal the cell air bag. Then place the cell in an oven at 85°C and bake for 30 minutes, and then proceed to chemical formation after the cell cools down.

[0043] Anode analysis: After the formation, the battery was fully charged to 4.2V, and then the battery was disassembled to observe the morphology of the anode sheet. In the battery of this embodiment, the wettability of the electrolyte in the pole piece is rel...

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Abstract

The invention belongs to the technical field of lithium ion batteries and particularly relates to a filling and activating method for a flexible-packaging lithium ion battery, wherein the filling and activating method can promote electrolyte to soak a diaphragm of an electrode quickly. The filling and activating method comprises the following steps that: 1, preheating: a battery cell and / or the electrolyte are / is heated, and then the battery cell is placed in a packaging bag; 2, filling: the electrolyte is filled in the packaging bag under the negative-pressure environment, and the side thrust is exerted on a main body of the battery cell at the same time; and 3, activating: an air bag on the packaging bag is sealed after the filling, and then formation and activation are carried out after high-temperature baking. With the adoption of the filling and activating method, the soaking speed of the electrolyte is greatly improved, the standing time of the battery cell after the filling is shortened, and the production efficiency is improved; meanwhile, good soaking of the electrolyte in the electrode can be promoted, thereby solving the problems of generating black spots at an anode, lithium separation and the like that are possibly caused in the follow-up formation process, so as to improve the electrochemical property of the battery cell. In addition, the technique is simple and easy, thereby being suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a method for injecting and activating a flexible-packaged lithium-ion battery capable of promoting rapid infiltration of an electrode membrane by an electrolyte. Background technique [0002] Lithium-ion battery is an efficient and environmentally friendly energy storage and conversion device with outstanding advantages such as high working voltage and high energy density, and has become the preferred power supply device for consumer electronics. [0003] One of the development directions of lithium-ion batteries is to continue to increase their energy density, which requires increasing the compaction density of active materials on the electrode membrane to increase their loading capacity. However, increasing the compaction density also means that the porosity of the electrode membrane is reduced, which makes it difficult for the electrolyte to fully inf...

Claims

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Application Information

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IPC IPC(8): H01M2/36
CPCY02E60/10
Inventor 徐延杰游从辉张柏清方宏新段栋
Owner NINGDE AMPEREX TECH
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