TDK Corp developed a surface-mountable all-solid battery and will start volume production in April 2018.

The shape of the battery is similar to that of a multi-layer ceramic capacitor (MLCC). And it enables to use solder reflow processes and general-purpose automatic packaging machines (pick-and-place machines) for electronic parts.

The rechargeable battery can be applied to IoT devices, energy-harvesting devices, beacons and real-time clock circuits. TDK will start to ship samples in December 2017.

The chip-like rechargeable battery

There are demands for small, safe batteries in the fields of IoT devices, etc.

With a small capacity, the battery can be used for a wide variety of purposes.

1st surface-mountable type

The electrolyte of all-solid battery is solid. So, it does not leak. The risk of ignition or explosion is low. It is drawing great attention as a next-generation technology that can replace existing lithium-ion (Li-ion) batteries.

All-solid batteries are being developed for a wide range of applications from large-capacity batteries for electric vehicles to small-capacity products that can replace coin batteries. This time, TDK will mass-produce small-capacity products.

"This will be the first time that a surface-mountable type has been commercialized," the company said.

Mounting cost can be reduced by surface mounting.

The product to be mass-produced is a multi-layer ceramic type (right).

A wide variety of applications can be expected.

50C high-output discharge

The dimensions of the product to debut in the market first are 4.5 x 3.2 x 1.1mm. Its output voltage, capacity and discharge current are 1.4V (rated), 100μA per hour (standard) and 20μA (standard).

However, it is possible to discharge 50C of power in a short period of time, which uses up the standard capacity in 1/50 hour. The minimum number of charge/discharge cycles is 1,000. Its operating temperature range is -20 to +80°C.

Its operating temperature range is -20 to +80 degrees C.

It is capable of high-output discharge.

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