All-solid-state battery withstands temperatures up to 302°F with wireless charging

Maxell has developed an all-solid-state battery module that fits the same 1/2AA size as batteries commonly used in industrial equipment, smart meters and IoT devices, while adding wireless charging capability. The module measures 14.5 millimeters in diameter and 25.2 mm in height, matching the form factor of a conventional ER battery. It delivers the same 3.6-volt output while combining rechargeable all-solid-state cells with a wireless charging circuit and a boost circuit. The company has developed two versions of the module. One can operate at temperatures up to 257°F, while the other is designed to withstand temperatures as high as 302°F. That combination could make the battery useful in equipment where replacing a battery is difficult or where openings in the enclosure could compromise protection against moisture and other environmental factors. Tiny battery tackles tough environments Conventional ER batteries are widely used as backup power sources in industrial equipment, smart meters and IoT devices. Because they are non-rechargeable, however, users must periodically replace them, creating maintenance work and a stream of discarded batteries. Maxell’s module is designed to address both problems. Once installed, it can be recharged wirelessly using a dedicated charger, reducing the need to physically access the battery. The wireless connection can also allow equipment manufacturers to avoid adding openings specifically for battery replacement or charging. That could be particularly useful for devices that need a highly sealed enclosure. The company says one potential application is a temperature logger used during the sterilization of retort food, where equipment needs to tolerate high temperatures while limiting moisture ingress. Maxell is conducting a joint feasibility study with House Foods Corporation on a food-process temperature logger using the new module. The battery’s high-temperature capability is another important part of the design. The 257°F and 302°F versions are intended to extend rechargeable solid-state battery technology into environments that can be too demanding for conventional rechargeable cells. Wireless charging without battery access The module is not simply a solid-state replacement for an ER battery. Its integrated electronics are designed to let existing equipment gain wireless charging functionality without requiring a complicated circuit redesign. The dedicated charger is tailored to the customer’s equipment, meaning the system is not a universal wireless charging accessory. Maxell also notes that wireless charging may not work with every enclosure material. Still, the small form factor could make the technology attractive for compact industrial sensors and other devices where space is limited. By retaining the familiar 1/2AA dimensions and 3.6V output, the module is designed to fit applications built around the dimensions and voltage of conventional ER batteries. The use of rechargeable all-solid-state cells could also reduce the frequency of battery replacement. For equipment deployed in large numbers or in locations that are difficult to access, fewer maintenance visits could translate into lower operating costs as well as less battery waste. Maxell has not announced commercial availability or a production timeline for the module. The company is currently evaluating potential applications with partners, including the food-processing temperature logger project with House Foods Corporation.Get the latest in engineering, tech, space & science - delivered daily to your inbox.With over a decade-long career in journalism, Neetika Walter has worked with The Economic Times, ANI, and Hindustan Times, covering politics, business, technology, and the clean energy sector. Passionate about contemporary culture, books, poetry, and storytelling, she brings depth and insight to her writing. When she isn’t chasing stories, she’s likely lost in a book or enjoying the company of her dogs.