New small energy device for wearables storage applications

01-10-2015 | Murata | New Technologies

In response to growing demand for energy-storage solutions, Murata has developed the UMAC, a small, high-capacity cylinder-type energy device for use in wearable and wireless sensor applications. The UMAC is a miniature device with a high energy storage capacity, low internal resistance, fast charging and discharging and the ability to withstand load fluctuations. It may be used as a secondary battery in the same way as a capacitor. The UMAC achieves better charge / discharge characteristics and has an extended cycle life superior to conventional batteries. Particularly well suited as a power supply for wearable devices or sensor nodes for wireless sensor networks, the UMAC maintains flat voltage characteristics while accommodating a wide range of load characteristics. The UMAC has several key safety features. Because of its small capacity and use of chemically stable materials, thermal runaway does not occur. This means that smoke or fire will not occur should a short circuit happen. The UMAC has a high rate of charge / discharge cycles and is capable of 10 cycles per hour with a maximum discharge rate amount of 30mA. It also features an extended cycle life with a capacity recovery rate of 90% or higher after 1,000 cycles. The UMAC is particularly suitable as an energy device for sensor nodes within wireless sensor networks because high-rate discharge characteristics mean that peak-assist capacitors are not required. Low self-discharge level minimizes loss of stored energy and flat voltage characteristics permit use immediately after charging starts for stable device operation. Another application is as a power supply for digital pens or wearable devices. This is because long cycle-life characteristics enable repeated use after rapid charging and also as chemically stable composition allows small size and safe packaging. Other uses include backup power supply for electric home appliances and electronic devices such as mobile phones and information terminals, says the company. CEATEC Japan 2015, Makuhari Messe, October 7 (Wed.) to 10 (Sat.).

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