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Developments in Safe Energy for Wearable Electronics
Keywords: Energy, Battery, Safety
With an increase in publicity of the dangers of lithium ion batteries, there is a concerted effort to make them safer. This is of particular importance for the wearables market where the battery will be in close proximity to the user. Rechargeable Power Energy North America provides or has developed energy solutions for wearable devices, among other industries, with the ability to deliver custom form factors, safe chemistries, and state-of-the-art battery management systems. Custom-shaped and curved cells have been developed that will conform into any space requirement. These cells pack the maximum capacity possible, all the way down to 5 mAh. Selecting the correct number and configuration for a given product is an important part of product design, keeping in mind a number of criteria including size, power, and energy. This presentation discusses how to best select cells for a given product or application. The latest safe chemistries including lithium iron phosphate and derivatives as well as dry electrolytes to virtually eliminate any chance of flame or venting are discussed. These advances have passed nail penetration, bullet, and complete cell shearing tests with no explosions, flame, or ignition of gases. The latest examples that meed in safety certifications including UN, UL, and IEC approvals will be described. RPE engineers battery management systems are built around Texas Instruments’ technology. These are fully programmable so their functions can be tailored to a given need. Typical use would prevent batteries from approaching a dangerous state, shutting down the system. Texas Instruments provides small footprint BMSs to fit in small spaces and include the latest features such as wireless charging. A discussion on how to design the best battery circuits for wearable products is provided.
Tim Chin,
Rechargeable Power Energy North America
Las Vegas, NV

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