A manufacturing process of high-performance flexible packaging lithium-ion battery cells

Abstract

The invention relates to a manufacture process of a high-performance flexible-packaging lithium ion battery cell. The manufacture process comprises the following steps of A. coating an aluminum foil current collector with positive slurry, coating a copper foil current collector with negative slurry to prepare a positive plate and a negative plate respectively; B. laminating the positive plate and the negative plate and separating the positive plate from the negative plate by a diaphragm; C. laminating four aluminum foil current collectors and two copper foil current collectors in a sequence of the aluminum foil current collector, the copper foil current collector and the aluminum foil current collector, and separating the aluminum foil current collectors from the copper foil current collectors by diaphragms; and D. laminating electrode lugs manufactured in the step C on the battery cell, aligning the electrode lugs of the aluminum foil current collectors with the positive plate, aligning the electrode lugs of the copper foil current collectors with the negative plate, and then welding the positive plate and the electrode lugs as well as the negative plate and the electrode lugs by an ultrasonic welding machine to form a positive and a negative. The design of the battery cell is improved on the basis of thermal control, so that the thermal runaway phenomenon cannot happen, therefore, the battery safety problem is solved radically and the safety performance of the lithium ion battery is improved.

Description

technical field [0001] The invention belongs to the field of lithium ion battery manufacturing, and in particular relates to a manufacturing process of a high-performance flexible packaging lithium ion battery core. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, small self-discharge, no memory effect and no pollution. They have been widely used in various electronic products. It is particularly noteworthy that in recent years, power lithium-ion batteries have been used in electric vehicles. High expectations are placed on the application in the field. However, the closed-cell temperature of the diaphragm commonly used in the production of lithium-ion batteries is about 150 °C, and the membrane breaking temperature is about 170 °C. The temperature rises rapidly, even if the diaphragm will close itself to prevent ion conduction at 150 °C, but due to thermal inertia and hysteresis, the temperature will continue t...

AI Technical Summary

Problems solved by technology

[0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, small self-discharge, no memory effect, and no pollution. High expectations are placed on the application in the field. However, the closed cell temperature of the diaphragm commonly used in the production of lithium-ion batteries is about 150°C, and the membrane rupture temperature is about 170°C. Rapid rise, even at 150°C, the diaphragm will close itself to prevent ion conduction, but due to thermal inertia and hysteresis, the temperature will continue to rise, and may reach or even exceed 170°C. At this time, the melting and rupture temperature of the diaphragm is reached, forming a large The area is short-circuited, out of control, and in extreme cases, the battery may burn or even explode. The safety of lithium-ion batteries is currently the main bottleneck restricting its application expansion. Crazy current or high heat will cause safety hazards, so it is necessary to deal with the thermal control of lithium-ion batteries to ensure the safety of lithium-ion batteries