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Sanyo Rechargeable Li Coin Battery to Reflow
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Sanyo Electric Co, Ltd has commercialized a coin type of rechargeable lithium battery which can be used in reflow processes. The coin battery, measuring 4.8mm in diameter and 1.4mm in height, has a capacity of 0.1mAh and 3V, enabling 20 hours memory backup at 5micron-ampere current supply as well as 1,000 recharging cycles. The ML414R is designed for power supply for real-time clock (RTC) and other circuits in mobile phones. In phone operation, the coin battery is charged by a main lithium-ion battery with larger capacity, but when the main battery is discharged out or removed for a long time, the coin battery operates to charge the small capacity circuits.
Previously, a large capacitance capacitor was used for the application, but it continued to charge circuits during only one or two hours. To lengthen the operating time, a coin battery with a plastic socket was also used for the application, but the coin had to be used by hand operation, leading to slow production speed.
Sanyo's coin batteries are supplied in a form of tape reel which can be processed as other tape components, leading to quick production. To endure the reflow temperature of 240Centigrade, the company developed new materials for a separator, electrolyte and gasket in the battery. Anode and cathode electrodes are lithium-aluminum and manganeze dioxide, respectively, as previously.
(October 2000 Issue, Nikkei Electronics Asia)
Previously, a large capacitance capacitor was used for the application, but it continued to charge circuits during only one or two hours. To lengthen the operating time, a coin battery with a plastic socket was also used for the application, but the coin had to be used by hand operation, leading to slow production speed.
Sanyo's coin batteries are supplied in a form of tape reel which can be processed as other tape components, leading to quick production. To endure the reflow temperature of 240Centigrade, the company developed new materials for a separator, electrolyte and gasket in the battery. Anode and cathode electrodes are lithium-aluminum and manganeze dioxide, respectively, as previously.
(October 2000 Issue, Nikkei Electronics Asia)
