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A pole piece impregnation method for a soft-pack lithium-ion battery

A lithium ion battery and ion battery technology, applied in the field of lithium ion batteries, can solve problems such as the impact of battery cycle performance, and achieve the effects of improving wetting effect, improving wettability, and increasing contact area

Active Publication Date: 2021-08-03
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the amount of sizing agent is not added, it will have a negative impact on the cycle performance of the battery

Method used

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  • A pole piece impregnation method for a soft-pack lithium-ion battery
  • A pole piece impregnation method for a soft-pack lithium-ion battery
  • A pole piece impregnation method for a soft-pack lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] A pole piece impregnation method for a soft-pack lithium-ion battery, comprising the steps of:

[0061] The first step: before liquid injection, the electrolyte in the electrolyte storage mother tank 1 is transported to the electrolyte storage tank A2 through a pipeline under high pressure, and passes through the stirring device installed in the electrolyte storage tank A2 (stirring speed 15rpm / min ) and a vacuum device (vacuum degree -90KPa) to remove the bubbles in the electrolyte, and transport it to the electrolyte storage tank B3 through the pipeline, and transport it from the electrolyte storage tank B3 to the pipeline to obtain the electrolyte to be preheated.

[0062] The coating process and the liquid injection process are produced at the same time. The waste heat recovery device 7 of the coater is connected to the coating drying system 8 through the first exhaust pipe 11, and recovers the waste heat generated by the oven of the coater. 10. Provide high-tempera...

Embodiment 2

[0071] A pole piece impregnation method for a soft-pack lithium-ion battery, comprising the steps of:

[0072] The first step: before liquid injection, the electrolyte in the electrolyte storage mother tank 1 is transported to the electrolyte storage tank A2 through a pipeline under high pressure, and passes through the stirring device installed in the electrolyte storage tank A2 (stirring speed 15rpm / min ) and a vacuum device (vacuum degree -90KPa) to remove the bubbles in the electrolyte, and transport it to the electrolyte storage tank B3 through the pipeline, and transport it from the electrolyte storage tank B3 to the pipeline to obtain the electrolyte to be preheated. The coating process and the liquid injection process are produced at the same time. The waste heat recovery device 7 of the coater is connected to the coating drying system 8 through the first exhaust pipe 11, and recovers the waste heat generated by the oven of the coater. 10. Provide high-temperature air ...

Embodiment 3

[0081] A pole piece impregnation method for a soft-pack lithium-ion battery, comprising the steps of:

[0082] The first step: before liquid injection, the electrolyte in the electrolyte storage mother tank 1 is transported to the electrolyte storage tank A2 through a pipeline under high pressure, and passes through the stirring device installed in the electrolyte storage tank A2 (stirring speed 15rpm / min ) and a vacuum device (vacuum degree -90KPa) to remove the bubbles in the electrolyte, and transport it to the electrolyte storage tank B3 through the pipeline, and transport it from the electrolyte storage tank B3 to the pipeline to obtain the electrolyte to be preheated. The coating process and the liquid injection process are produced at the same time. The waste heat recovery device 7 of the coater is connected to the coating drying system 8 through the first exhaust pipe 11, and recovers the waste heat generated by the oven of the coater. 10. Provide high-temperature air ...

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Abstract

The invention provides a pole piece infiltration method of a soft-packed lithium-ion battery, which includes the following steps: Step 1: before liquid injection, use a defoaming system to remove air bubbles in the electrolyte, and then use a preheating system to preheat the electrolyte Heat; the second step: put the baked semi-finished battery in a vacuum drying oven, and the liquid injection system is vacuumed in three gradient cycles to inject electrolyte into the semi-finished battery. After the liquid injection is completed, pre-seal to obtain a pre-sealed battery; Step 3: Use charging and discharging equipment to charge the pre-sealed battery to obtain a rechargeable battery; Step 4: Place the rechargeable battery obtained in the third step at a high temperature and tilt it, and at the same time, use a fixture to charge the rechargeable battery obtained in the third step The front and back of the battery are slapped. The method of the invention can greatly improve the wettability of the pole piece of the soft-pack lithium ion battery, and is convenient for popularization and application in large-scale production.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a method for impregnating pole pieces of soft-packed lithium-ion batteries. Background technique [0002] The electrolyte is an important part of the lithium-ion battery, and its main function inside the lithium-ion battery is to conduct ions between the positive and negative electrodes. The infiltration of the electrolyte on the pole piece involves the three-phase contact of solid, liquid and gas. When the electrolyte is injected into the battery shell, the electrolyte must first discharge the air in the shell, and then the electrolyte will adhere to the surface of the positive and negative active materials, and part of the electrolyte will enter the positive electrode-diaphragm-negative electrode through the diaphragm of the winding core between. As time goes on, there will be a phenomenon that the electrolyte infiltrates the pole piece and the electrolyte in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/0525
CPCH01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 陈素娜许少辉
Owner TIANJIN ENERGIES
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