Device for infiltrating electric core

Abstract

An embodiment of the invention discloses a device and a method for infiltrating an electric core. The electric core is a soft-package lithium-ion battery electric core, the device comprises a first communication part, a cavity, a second communication part and a sealing part, one end of the first communication part is connected to a first air pressure adjustment device, the cavity is fixedly communicated with the other end of the first communication part, the electric core can contain in the cavity, pressure in the cavity is increased and reduced by the first air pressure adjustment device, one end of the second communication part is connected to a second air pressure adjustment device, an air bag of the electric core is fixedly communicated with the other end of the second communication part, the second air pressure adjustment device increases and reduces pressure in the electric core through the second communication part, an opening portion of the air bag of the electric core is sealed by the sealing part, and the inside of the electric core is isolated from outside in the cavity. According to the device, the inside of the electric core is isolated from the outside in the cavity, so that ideal pressure difference can be formed, capillaries of the inside of the electric core are enhanced, bubble breakage is accelerated, and electrolyte infiltration efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, and more specifically, to a device for soaking electric cores. Background technique [0002] Lithium-ion secondary batteries have the characteristics of high energy density, small size, good discharge point platform characteristics, long cycle life, no memory effect, green and pollution-free, etc., and have broad applications in the fields of electronic products, power tools, new energy vehicles and energy storage power stations. application prospects. [0003] The production process of lithium-ion batteries includes pulping, coating, calendering, slitting, cutting, lamination, tab welding, heat sealing, liquid injection, electrolyte impregnation, chemical composition, etc., in which the electrolyte is soaked in the lithium battery Among the many production processes, it takes the longest time, because sufficient standing can ensure that the electrolyte undergoes a thorough micro-react...

AI Technical Summary

Problems solved by technology

[0005] CN103872381A relates to a method for statically injecting power batteries, in which two methods are compared: 1. After the electrolyte is injected, it is left to stand for 12-24 hours in a workshop with dry air. The siphon effect is not ideal, resulting in slow electrolyte infiltration, low production efficiency, high internal resistance and poor cycle life; Vacuum and pressurize three times. After each vacuuming or pressurization, stand for a certain period of time, and then release the pressure of the power battery to normal pressure to enter the subsequent process.

In this process, there are two problems in one-time vacuuming and pre-sealing after the liquid injection is completed: 1. The unabsorbed electrolyte is unevenly distributed due to one-time vacuuming; 2. The contact process between the electrolyte and the electrode after the cell injection A chemical reaction will occur in the gas to generate gas, thereby releasing the force of a vacuum to compress the cell or destroying the vacuum degree. The failure of the vacuum will affect the siphon effect of the electrode and the diaphragm, and reduce the electrolyte infiltration efficiency.

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