COVER STORY
World’s first rechargeable solid-state SMD battery
David Pearson, Technical Director at Anglia B
attery technology is evolving rapidly driven by demand from consumers and industry 4.0 for portable low power devices with ever greater functionality such as wearable health monitors or energy harvesting sensor nodes that are deployed in the field. These devices in turn are putting pressure on manufacturers to create more compact, easy to integrate, long life, reliable and safe batteries. TDK is leading the field with CeraCharge™, the world’s first rechargeable solid-state SMD battery offering 1000 times the capacity of a capacitor in the same case size. The award-winning batteries are constructed with TDK’s advanced ceramic multilayer process know how using Lithium based ceramic oxides for the electrolyte and inner electrode. It combines the advantages of a Li-ion battery with the safety and high volume, cost optimised manufacturing benefits of ceramic multilayer products.
David Pearson, Technical Director at Anglia introduces this innovative product from TDK that has been developed to meet these challenges.
Benefits of CeraCharge
The all ceramic construction of CeraCharge means it cannot leak, burn or explode and is not subject to any airfreight transportation restrictions that apply to traditional Li-ion and Lithium metal batteries. In addition the robust construction and inherent safety means it is compatible with standard surface mount reflow soldering processes allowing the device to be attached
directly to the PCB at the same time as other components, greatly speeding up and simplifying the production assembly process.
The first CeraCharge device released to market by TDK is available in an industry standard 1812 package measuring 4.4mm x 3.0mm with a low profile height of just 1.1mm, this compact size allows it to be integrated into almost any device. The CeraCharge batteries have a nominal voltage of 1.5V, a nominal capacity of 100µAh and a wide operating temperature range of -20°C to +80°C. Depending on application usage this battery is able to perform more than 1000 charge/ discharge cycles and, after that, more than 80% of its capacity is still available. It is also capable of delivering currents in the order of several mA for short periods.
The CeraCharge devices can be used with fast and pulsed discharging methods, this makes them useful for instance in low power RF applications where a short duration peak power pulse is required when the device is transmitting.
Parallel & Series Connection To increase voltage and capacity to suit different application needs, virtually any number of the CeraCharge batteries can be connected in parallel or in series. When connected in this way they do not require an integrated battery protection circuit that would normally be needed with traditional Li- ion batteries or complicated cell balancing circuits typically required with supercapacitor arrays, helping to reduce costs even further.
Typical discharge curves
Typical pulse power
CeraCharge Applications A typical application for CeraCharge is an IoT beacon device that is designed to collect and broadcast data from a sensor. Beacons can be deployed in locations where a power source is not readily available or using a non-rechargeable battery is not practical due to the need to replace it at intervals, instead these beacons will often utilise energy harvesting technologies such as solar cells or similar. CeraCharge can be used to store and then deliver this harvested energy in the same way a traditional rechargeable battery would, its high number of charge and discharge cycles means it can do this reliably over long periods of time. CeraCharge can be used as the primary power source or as a sub-battery in a wide range of products including wearables, RTC battery backup, IoT and Industrial IoT devices and systems that are deployed in production facilities, building management, machines, transport, healthcare and many other applications.
8 June 2020 Components in Electronics
Anglia Design Support
Anglia offer support for customer designs with free samples of CeraCharge and other TDK products via the EZYsample service which is available to all registered Anglia Live account customers.
Anglia’s team of field application engineers are also on hand to support customers designing low power portable devices.
Visit
www.anglia-live.com to find out more information on CeraCharge and other TDK products available from Anglia.
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