Button type lithium ion battery

Abstract

The invention belongs to the technical field of preparation of button batteries, and particularly relates to a button type lithium ion battery. The button type lithium ion battery comprises an anode shell, a cathode shell and a coil core, wherein the anode shell and the cathode shell form a shell together; the shell coats the coil core; a sealing ring is arranged between the anode shell and the cathode shell in a clamping way; one end of the coil core extends out of aluminum foil; the tail end of the aluminum foil extends out of an aluminum foil elongated body; and the aluminum foil elongated body is clamped between the sealing ring and the anode shell after the battery is sealed. The aluminum foil elongated body is tightly contacted with the inner wall of the anode shell, a welding process is not required, the process program is saved, and the manufacturing cost is reduced, so that the voltage and the internal resistance of the button type lithium ion battery are stable, and the problem that the battery is low in voltage and high in internal resistance and cannot be charged and discharged due to sealing-off (caused by bump or vibration of the battery) between the aluminum foil and the inner wall of the anode shell is effectively solved.

Description

technical field [0001] The invention belongs to the technical field of button battery preparation, in particular to a button lithium ion battery. Background technique [0002] With the continuous development of microelectronics technology, the application of button lithium-ion batteries is becoming more and more extensive. Button-type lithium batteries are mainly used in computer motherboards, MP3 watches, calculators, IC cards, electronic dictionaries, tax control machines, Bluetooth headsets, hand-cranked rechargeable flashlights, toys, walkie-talkies and other products. They have good operating temperature and good sealing performance. , Long storage time, stable discharge voltage and many other advantages. [0003] Button-type lithium-ion batteries are composed of positive and negative shells, positive plates, negative plates, separators and electrolyte. Usually, there will be a section of uncoated foil at the positive and negative ends of the core of the button-type ...

AI Technical Summary

Problems solved by technology

With the button battery of this structure, the aluminum foil is easy to desolder with the inner wall of the positive electrode shell after being bumped or vibrated, resulting in low voltage, high internal resistance and failure to charge and discharge the battery, which seriously affects the electrochemical performance and safety performance of the battery.

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