Maxell Develops ER Battery-Sized All-Solid-State Battery Module Supporting Wireless Charging*1

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^*2, it enables wireless charging^*1 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^*1 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.

One potential application of this module is temperature loggers for food processes used in high-temperature environments. For example, temperature loggers used in the sterilization process of retort foods require both heat resistance and a high degree of sealing performance to prevent moisture ingress.

Currently, Maxell is conducting a joint feasibility study with House Foods Corporation on a temperature logger for food process using this module, and the findings will be presented at the annual convention of the Japan Society for Food Engineering to be held on Monday, August 31.

Under its corporate byline, “Micro batteries. Maximum impact.”, Maxell embodies the belief that small batteries can create great value. Moving forward, Maxell aims to commercialize batteries that offer high reliability, high heat resistance, high power output, and large capacity, enabling applications where conventional batteries face limitations.

Furthermore, Maxell will advance the development and commercialization of module products that integrate all-solid-state batteries with wireless charging and energy harvesting technologies, contributing to the resolution of social challenges and the realization of a sustainable society.

*1 Wireless charging: This function may not be available depending on the enclosure material used in the customer’s equipment.
*2 Dedicated charger: A dedicated design tailored to the customer’s equipment is required.

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Marketing & Sales Div., Maxell, Ltd.
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