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HEC battery technology tips 1,000Wh/l density

Posted: 23 Oct 2012     Print Version  Bookmark and Share

Keywords:solid state  battery  rechargeable  ceramic  High Energy Cell 

Infinite Power Solutions Inc. unveils the all-solid-state rechargeable battery High Energy Cell (HEC) technology. Said to offer low manufacturing cost and record energy density, the technology features a 4V rechargeable chemistry that claims to delivers high power, an ultra-low self-discharge rate and long life for permanent battery implementations.

The HEC technology offers a fully packaged volumetric energy density of greater than 1,000Wh/l, which is unprecedented for a 4V rechargeable chemistry, especially when packaged in form factors that are smaller and thinner than today's coin cells. As a figure of merit, HEC technology can produce a single cell capacity of 85mAh per charge cycle in a 20mm diameter round cell ~1mm thick. Such a cell exhibits a continuous current capability of 30mA and a peak pulse current of up to 90mA at 25°C.

With a similar 3-cell stack connected in parallel and packaged within a traditional 20mm diameter metal package like a coin cell, a capacity of 250mAh per charge cycle can be achieved within a 3.2mm standard thickness, while delivering 270mA of pulse current at 25°C. For comparison, a standard 3V primary non-rechargeable CR2032 LiMnO2 coin cell has a lifetime capacity of only 220mAh and a peak pulse current of up to 75mA. Though less common, 3.6V rechargeable coin cells are available today, but provide substantially less capacity and power than the aforementioned primary cell. Therefore, the HEC technology developed by IPS offers much higher lifetime energy and much more power than conventional coin cells available today.

All-solid-state HEC technology delivers about 700Wh/l of the rated capacity at a current density of 1mA/cm2, which is comparable to the continuous current density of a conventional Li-ion prismatic battery with energy densities of only 400-500Wh/l. Employing the HEC technology into a tiny, fully encapsulated, 4.8mm round cell with only 1mm thickness delivers ~3mAh of capacity at a continuous current of ~35µA and can provide a pulse current of ~3mA at 25°C. This is a strong capacity-current capability for many real-time clock and memory backup power applications, and offers 5 times more energy density and 5 times more power than existing ML414 cells using Li/MnO2 chemistry.

The ceramic-based HEC technology uses low cost, high throughput, non-vacuum manufacturing processes, compared to solid-state, thin-film batteries currently produced by the company. The technology is said to offer higher cell capacity than existing thin-film technology, yet remains inherently safe and eco-friendly. This technology enables a new era of low cost, high capacity, small form-factor, rechargeable batteries in traditional battery formats such as coin cells, or custom shapes and sizes to serve medical, industrial and consumer electronics.

Standard products that leverage HEC technology are expected to be available by 2014.

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