Button type lithium ion battery

Abstract

The invention belongs to the technical field of button battery preparation, and in particular relates to a button lithium ion battery, which includes a positive electrode case, a negative electrode case, and a winding core. The positive electrode case and the negative electrode case together form a casing, and the casing wraps the winding core , a sealing ring is sandwiched between the positive electrode casing and the negative electrode casing, an aluminum foil is extended from one end of the core, and an aluminum foil extension is extended from the end of the aluminum foil. After the battery is sealed, the aluminum foil extension is clamped in the sealing ring and the positive case. The aluminum foil extension body is in close contact with the inner wall of the positive electrode case without welding process, which saves process procedures and reduces manufacturing costs, making the voltage and internal resistance of the button-type lithium-ion battery more stable, effectively solving the problem of the battery being bumped or damaged. Vibration causes the aluminum foil to desolder from the inner wall of the positive electrode case, causing the battery to have low voltage, high internal resistance, and failure to charge and discharge.

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.

Images