Breaking through the constraints of traditional batteries, small solid-state batteries open a new era of IoT

As an alternative to traditional lithium-ion batteries, the development of solid-state batteries is currently underway globally. This next-generation battery uses a stable and non-flammable solid electrolyte material instead of liquid, eliminating the risk of leakage and fire, and has excellent safety, high reliability and longer life. TDK has successfully commercialized CeraCharge™, the world’s first all-ceramic solid-state SMD *1 battery, which is expected to be installed in various IoT devices.

As an alternative to traditional lithium-ion batteries, the development of solid-state batteries is currently underway globally. This next-generation battery uses a stable and non-flammable solid electrolyte material instead of liquid, eliminating the risk of leakage and fire, and has excellent safety, high reliability and longer life. TDK has successfully commercialized CeraCharge™, the world’s first all-ceramic solid-state SMD *1 battery, which is expected to be installed in various IoT devices. (Photo courtesy of CookPerfect)

Next-generation solutions to the limitations of traditional lithium-ion batteries

It is no exaggeration to say that as we enter the Internet of Things era and almost everything is connected to the Internet, in order to increase the penetration rate of various smart devices, in addition to compact form factor and stronger communication functions, high battery performance is also necessary. Lithium-ion batteries with high energy density are now widely used in various Electronic devices such as laptops, smartphones, and wireless earbuds, and are increasingly used in drones, electric bicycles, and EVs (electric vehicles). . However, because lithium-ion batteries are made using flammable organic solvent electrolytes, which pose a risk of leakage and fire, there is a growing need for IoT device manufacturers to develop safer and more reliable solid-state batteries containing stable electrolyte materials. It is expected that large-capacity batteries in devices such as EVs will also be replaced by solid-state batteries in the future, and its market size will further expand.

Global market size and forecast of small all-solid-state lithium-ion thin batteries

Breaking through the constraints of traditional batteries, small solid-state batteries open a new era of IoT

Source: Based on the global next-generation battery market: 2019 key survey findings by the Yano Institute of Economic Research, Japan.

The solid-state battery market is expected to grow exponentially over the next 10 years.

Comparison of conventional lithium-ion batteries and solid-state lithium-ion batteries

Breaking through the constraints of traditional batteries, small solid-state batteries open a new era of IoT

Solid-state batteries use solid electrolyte materials instead of liquid electrolytes in traditional lithium-ion batteries, providing a higher level of safety and longer service life.

Features of CeraCharge, a solid-state SMD battery pioneered by TDK

TDK has successfully commercialized CeraCharge, the world’s first solid-state SMD (Surface Mount Device) battery, as companies around the world continue to work on solid-state battery development. CeraCharge is based on TDK’s advanced laminated ceramic technology and has the advantage of being suitable for mass production. Its solid ceramic electrolyte eliminates the risk of leakage and fire, while offering other useful features including: 1.5V nominal voltage, 100µAh capacity, and -20˚C to 80˚C operating temperature range. Additionally, its SMD-type design facilitates battery placement, helping to reduce assembly costs. Due to its small size, high security and long lifespan, it is well suited to be incorporated into IoT devices used in various environments.

Cross-section (schematic) of a CeraCharge™ solid-state battery

Breaking through the constraints of traditional batteries, small solid-state batteries open a new era of IoT

CeraCharge is built using TDK’s advanced laminated ceramic technology.

for cooking thermometers

The chip-sized safe solid-state battery CeraCharge is gradually being applied to various IoT products. One such application is the cooking thermometer product launched in December 2020. This new product is a 15cm metal thermometer probe produced by CookPerfect, a Danish company that produces a series of cooking thermometers. It is equipped with five temperature sensors, a BLE (Bluetooth Low Energy)*2 communication module and TDK’s CeraCharge. Simply plug in this probe and monitor the internal temperature of the roast in the oven in real time from your smartphone. With this ground-breaking product, people can cook all kinds of meat, including Christmas roasts, at the ideal temperature.

Martin Kloster, co-founder and managing director of CookPerfect, said: “When we started designing CookPerfect in 2016, there was simply no battery technology that could support measurements at 5 points, run complex algorithms, and have built-in But with CeraCharge, we were able to create the first ‘true wireless’ thermometer.” Kloster mentioned that reliability and safety are very important, as these thermometers will be inserted directly into food and used in high-temperature ovens and grills. “There must be absolutely no chemical leaks. We also needed a high operating temperature range that could withstand use inside an oven. The solid state CeraCharge has no risk of leaks, is small enough to fit into a 3.7mm diameter unit, and can withstand Up to 85˚C temperature, that was the main determinant of our choice to use it in our products.”

CookPerfect’s Wireless Meat Thermometer

Breaking through the constraints of traditional batteries, small solid-state batteries open a new era of IoT

The 15cm metal probe contains five temperature sensors, a communication module and solid-state CeraCharge battery for real-time temperature monitoring of meat as it cooks. (Photo courtesy of CookPerfect)

Such as cooking thermometers that combine temperature sensors with communication capabilities, and with the proliferation of devices equipped with various sensors, a full-scale IoT society is on the horizon. With the growing market demand for batteries of various sizes and specifications, CeraCharge is currently being considered for integration into a variety of devices, including real-time clocks (RTCs)*3 for smart meters, wearables, and smart sensors.

As the world’s first company to commercialize solid-state batteries, TDK will continue to work on expanding its product range while increasing its miniaturization and capacity to cover a wider range of applications. CeraCharge will continue to provide strong support for the rapidly expanding IoT market.

CeraCharge™ Solid State Battery

Breaking through the constraints of traditional batteries, small solid-state batteries open a new era of IoT

From simple gadgets to devices with complex specifications, a variety of industrial and consumer IoT devices increasingly require compact, safe and reliable power supplies. To meet these needs, TDK developed the world’s first rechargeable solid-state SMD battery CeraCharge.

the term

Surface Mount components (SMD): Electronic components that are mounted on a printed circuit board with solder. This method takes up less space and enables device miniaturization compared to attaching components through leads on a printed circuit board with holes.

BLE (Bluetooth Low Energy): Part of the Bluetooth standard, a short-range wireless communication technology. Due to its low power consumption and cost, it has attracted attention as a communication technology for IoT devices.

Real Time Clock (RTC): A circuit embedded in a computer or device that continuously measures the passage of time even when the system is powered off.

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