A different variety of functional, high-energy lithium battery packs is changing the shape of next-generation products. Convenient gadgets, starting from notebook computers to handheld medical devices to tools, are benefiting from continuous developments in energy density, together with from the rise of thin-format laminate cells. For design engineers, the final thought is that compact items with longer charge times are generally more possible than before.

Indeed, designers of consumer goods are doing exactly that. Apple Inc. comes with notably used laminate-style lithium polymer batteries to great advantage in the Ipod and iPad, along with the paper-thin MacBook Air.

General Motors and also Nissan are really utilizing the same laminate-style systems on the Volt and Leaf, while Tesla Motors is applying 6,800 cylindrical lithium-ion batteries in its highly marketed Roadster. At the same time, lithium is definitely getting a significant niche within the medical industry, at which cart-based equipment are which gives way to hand held displays.

Some of the keys to the recent rise of lithium-ion cells can be the consistent increase in capacity. Just lately, two.2Amp-hour cobalt-based lithium power packs were all the rage, however in the previous five-years; they’re replaced by lithium cells that utilized nickel-manganese, and then nickel-aluminum. Throughout this march of success, battery capacities went up by to 2.6A-hr. and after that 2.9A-hr.

Around June, Panasonic presented the NCR18650A, a lithium-ion cell that once again extends battery pack efficiency, this time to 3.1A-hr. Later on this year, several battery producers would like to shift to 3.4A-hr. And 4.0A-hr. power packs in the popular 18650 form factor (cylindrical battery packs a bit bigger than an AA) could be available as soon as 2013, they claim.

Cylindrical cells push the envelope Engineers say the higher-energy breed of batteries is opening innovative applications in countless companies, but specifically in healthcare. There, clients are incorporating these items within portable ultrasound, portable o2 concentrators, and also portable work stations for the purpose of keeping track of clients. At the same time, a classical number of customers still is making use of lithium-ion as an alternative for nickel-metal hydride battery packs in notebook pc’s, cell phones, digicams, and even power tools.

Laminate batteries make a comeback Even within the lithium-ion grouping, however, a sub-category is increasing momentum. Lithium polymer, another branch of lithium-ion which utilizes a flat laminate composition, is definitely reaching a growing array of programs. “There’s definitely a trend toward lithium polymer in portable devices because there’s a race to make them all thinner,” TI’s Barsukov says. “All of the newest, coolest gadgets out there, starting with Apple and Android devices, are using polymer because of the thin cells and the high energy density.”

In fact, Apple’s MacBook air measures 0.sixty seven ” thick, thanks to some extent to its utilization of lithium polymer battery packs. Lithium polymer presents additional strengths. One of them:

Overall flexibility, allowing engineers to simply adjust a design in order to suit a approved space Aspect ratio, rendering it simpler to create a large, flat cell Higher C-rate, which makes it possible to supply a lot more current in less time Lithium polymer offers many alternatives because it uses a laminate structure that has an electrolyte which can range between water to gel to solid. Not like conventional lithium-ion cells, that happen to be contained in a metal can, lithium polymer cells reside in a minimized foil container, very much like any potato chip bag. The multi-layered bag helps to keep liquid from moving into the battery as well as helps prevent electrolytes from leaking out, however it gives another advantage: It’s far lighter in weight and slimmer compared to the cylindrical metal covering of the 18650. Of which, consequently, enables us to develop a battery pack that’s similar in form to a loose-leaf notebook.

Furthermore, lithium polymer cells offer better rates of discharge. The C-rate — a parameter that describes the time it requires to fully discharge a battery — is a lot higher in polymer batteries when compared to cylindrical or even prismatic lithium-ion battery power. While traditional lithium-ion batteries top out at C-rates of roughly 2, lithium polymer batteries can offer C-rates approaching 15 or more. The cabability to discharge current at quicker rates results in greater power for the applications.

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