Flexible package lithium ion battery and processing method thereof

Abstract

The invention provides a flexible package lithium ion battery and a processing method thereof. The flexible package lithium ion battery comprises a membrane housing, a lug, and an electric core and an electrolyte which are arranged in the membrane housing, wherein the membrane housing is provided with a sheet one-way valve, one end of the sheet one-way valve is inserted into the electric core and the other end of the sheet one-way valve is exposed outside the electric core, and the sheet one-way valve is used for exhausting gas inside the flexible package lithium ion battery. The processing method of the flexible package lithium ion battery comprises the following steps of: A, punching the housing without an air bag; B, coiling the electric core into the membrane housing; C, doubling over along an upper die cavity and a lower die cavity, carrying out tip seal and side seal, packaging the sheet one-way valve on the membrane housing; D, injecting electrolyte, standing until the electrolyte is absorbed completely and vacuumized; E, packaging the electrolyte-injecting side; and F, degassing. Through arranging the sheet one-way valve on the top, gas generated during the degassing can be immediately exhausted, the air bag and the air bag and the right side part of the air bag can be removed during punching the housing, thus raw materials and processing procedures are saved, and packaging effect and safety of the battery are improved.

Description

technical field [0001] The invention relates to a lithium ion battery and a processing method thereof, in particular to a soft package lithium ion battery and a processing method thereof. Background technique [0002] Since the birth of lithium-ion batteries, due to their high specific capacity, high specific energy, long cycle life, no memory effect, clean and environmentally friendly, etc., they have been rapidly developed and widely used. At present, lithium-ion batteries have been popularized in the field of small batteries. . However, its high production cost and poor safety have restricted the further development of lithium-ion batteries. [0003] At present, in the packaging process of flexible packaging lithium-ion batteries, the shell punching method with an air bag is generally used, such as figure 1 As shown, it is a schematic diagram of the structure after punching the shell, including the upper and lower mold cavities 1, the air bag 2 and the membrane shell 3....

AI Technical Summary

Problems solved by technology

The process of this prior art has the following defects: 1. The material on the right side and the airbag need to be cut off and discarded after the secondary packaging, so this method consumes a lot of aluminum-plastic film and wastes a lot

2. When the liquid injection side is packaged, it needs to go through primary packaging and secondary packaging, which requires many processes and man-hours, and is uneconomical

3. The secondary packaging position cannot be packaged immediately after liquid injection, and will continue to be in contact with the electrolyte in the subsequent process. Longer contact time between the packaging and the electrolyte will result in reduced packaging tension and reduced packaging effect

4. Long-term contact with the harmful gas that may be generated inside the battery will also cause the performance of the battery to decline

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