COVER STORY
Kyocera AVX latest PrizmaCapTM offers best-in-class performance
In this month’s issue David Pearson, technical director at Anglia, looks at the latest PrizmaCapTM
improve the performance and longevity of their battery system. supercapacitor from Kyocera AVX and how it can be utilised to help developers
and Power (SWaP) optimized, battery-powered products. The PrizmaCap supercapacitors can be used on their own as system power backup devices, replacing batteries in some cases, or they can be used in conjunction with primary or secondary batteries. Using them in conjunction with a battery allows for extended system backup time, improved battery life, and allows provision of instantaneous power pulses in energy storage, energy and power holdup, pulse power handling, and battery assist applications.
M
ore and more consumer and professional electronics systems now rely on batteries as their primary power source, and a major preoccupation for their designers is how to eke the longest possible service life out of those batteries, to give the best possible user experience. Whilst there is enormous focus on finding the next big breakthrough battery technology or chemistry the fact is that these new breakthrough battery technologies are coming but they are all still around the corner. What can be done to maximise the performance and benefits of the battery technologies currently available?
We have previously looked at innovative battery management systems (BMS) on these very pages and they will continue to be a key part of the system helping to squeeze every last watt hour of energy from the batteries. Another often overlooked method of improving battery performance is to couple it with a supercapacitor technology which can help reduce the strain on the battery, particularly during discharge cycles.
What is PrizmaCap?
PrizmaCap is a superlative new series of standard and custom supercapacitors that employ a revolutionary new design in terms of form, fit, and function compared with other supercapacitors from Kyocera AVX. Leveraging this innovation, the supercapacitors have been engineered to provide peak performance in an array of Size, Weight
8 November 2021 Components in Electronics
How does PrizmaCap improve battery performance?
Essentially, the addition of a PrizmaCap helps smooth out the power demand which in turn enhances the performance and lifetime of the battery. Instantaneous power pulses, such as those typically seen in wireless communication systems during transmit cycles, or peak power assist requirements, such as those in motor drives, put a lot of current strain on the battery during these discharge events. Repetitive or prolonged exposure to power pulses and peak power assists
leads to increased battery heating, shorter run times and will ultimately impact the effective life of the battery by reducing its number of overall charge/discharge cycles. Placing a supercapacitor in parallel with the battery effectively buffers it from the harmful effects of these repetitive power pulses, thus supplementing the performance and lifetime of the battery. The PrizmaCap has an inherent low ESR which allows it to deliver large peak currents, up to 8.63A on the 15F model, and they are capable of fast charge/discharge cycles. Furthermore, their number of charge/discharge cycles far exceeds that of battery technology with more than 500K cycles achievable under specified conditions. These attributes make it possible for designers to increase the lifetime of the battery in a system, achieve longer run times and reduce servicing costs throughout the life cycle of the end product. Alternatively, it is also possible to specify smaller capacity batteries when using them in conjunction with supercapacitors, because any peak current demands are supplemented by the supercapacitor allowing a battery with a lower maximum discharge pulse current to be used.
Technical description of PrizmaCap The SCP Series PrizmaCap is initially offered in three standard capacitances with more planned in the coming months. The three initial capacitances offered are 3.5F, 8.5F and 15F with a rated voltage of 2.1V (derating to 1.1V for +90°C operation) and energy densities 1.14, 1.87 and 2.43Wh/kg respectively. They are also rated for maximum DCL as low as 50μA after 72 hours of operation, maximum ESR as low as 30mΩ at 1kHz and 55mΩ at DC, and up to 2,582W/kg power density and 0.0092Wh maximum energy. PrizmaCap offers the highest capacitance and energy densities currently available in the market for any small form factor (SFF) prismatic supercapacitors rated at more than 1F. Additional off-the-shelf solutions with standard footprints and capacitance values are planned and will be released as they are qualified. Custom SCP Series PrizmaCap supercapacitors are possible with customer-specified footprints and capacitance values spanning 1–500F.
www.cieonline.co.uk
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