Process and device for cell pole piece pressurization and injection

Abstract

This invention refers to a pressurizing liquid filling method and device for battery electrode piece, said battery containing casing with liquid filling hole and built in electrode piece, said method containing 1, connecting and fixing liquid filling hole with liquid container, 2, vacuumizing battery and liquid container in vacuum chamber, 3, stopping vacuumizing in reaching definite vacuity, then filling dried air or inert gases, 4, continuous pressurizing to proper pressure value, constant pressure for a period, 5, relieving high pressure in vacuum chamber and taking out the pressurized and liquid filled battery.

Description

【Technical field】 [0001] The present invention relates to an ion battery, and more specifically, the present invention relates to a process for preparing an ion battery and a preparation device thereof. 【Background technique】 [0002] Ion batteries, represented by lithium-ion batteries, are increasingly becoming important and indispensable power accessories for communication products such as mobile phones, mobile DVDs, and handheld computers. [0003] Ion batteries with high capacity ratio, especially lithium-ion batteries, have become important accessories for providing energy for communication products such as mobile phones, while the core of lithium batteries is the battery cell, which is composed of electrodes, electrolyte, etc., and the outer shell and cover plate. To be shaped and protected, there is a liquid injection hole on the shell or cover. At present, lithium-ion batteries generally adopt a square flat or cylindrical shell structure, and the shell material is g...

AI Technical Summary

Problems solved by technology

This method can make the pole piece wet better for the battery with a small compaction density of the pole piece and / or a small filling density of the battery cell; , the wetting effect of the pole piece in the cell is not ideal

Because when the filling density is high, the distance between the pole piece and the pole piece will be very small, so the passage for the electrolyte to enter the pole piece in the battery is very small, and the electrolyte in the battery is only possible after a longer period of time. Wet the pole piece, but if the wetting process is too long, the cell may be disturbed and affected by the external environment (especially moisture). It may not be able to guarantee the sufficient wetting effect of the pole piece

If the wetting of the pole piece is not good, the polarization of the battery cell is too large during formation, which may lead to the lithium separation of the pole piece, resulting in the irreversible capacity of the battery cell and reducing the effective energy capacity of the battery.

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