Maxell Develops ER Battery-Sized All-Solid-State Battery Module Supporting Wireless Charging

Contributing to Improved Maintenance Efficiency and Reduced Environmental Impact through Reduced Battery Replacement Frequency and Reduced Battery Waste

Maxell, Ltd. has developed an all-solid-state battery module compatible with a 1/2AA-size (diameter 14.5 mm,
height 25.2 mm) lithium thionyl chloride battery (hereinafter ER battery), along with a dedicated charger. The module is available in two versions, one capable of operating at temperatures up to 125°C and the other up to 150°C.
Currently, ER batteries are widely used in industrial equipment backup systems, smart meters, and IoT devices. Among them, 1/2AA-size ER batteries are mainly used in IoT sensors. However, because ER batteries are primary batteries (non-rechargeable), periodic battery replacement and the disposal of used batteries present ongoing operational challenges.
The newly developed module integrates a wireless charging circuit, highly heat-resistant and highly reliable all-solid-state batteries, and a boost circuit into a 1/2AA-size, while delivering the same 3.6 V output voltage as conventional ER batteries. When used in combination with the dedicated charger, it enables wireless charging capability to be added to existing equipment without requiring complex circuit design.
By incorporating rechargeable all-solid-state batteries, the module helps reduce battery replacement work and minimize battery waste. In addition, its wireless charging capability eliminates the need for openings in device housings for battery replacement or charging, making it suitable for equipment that requires a high degree of sealing performance.