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M55342K03B10D5RWB_Datasheet PDF


Lithium ion battery advances over the past 20 years have enabled the mass adoption of mobile phones and portable personal computers.However, cost and performance of the battery relative to the final product in a 1990’s mobile phone were major barriers to the ubiquitous use of these products.It was not until these issues were resolved that the products took off.The automotive industry is facing similar challenges in its drive towards a volume Electric Vehicle market, with the added competitive barrier of the internal combustion engine.Mobiles and PCs provided previously unseen capabilities, whereas fossil fuel vehicles have been refined since the early 1900s onwards.

Battery Technologies

M55342K03B10D5RWB_Datasheet PDF

All batteries are complex electro-chemical systems where a number of factors in product design and vehicle usage must be taken into account. Of all the parameters, two of the most significant characteristics are Energy Density and Power Density.Energy Density determines the amount of energy that the battery can store and Power Density describes the rate at which the energy can be released or absorbed.For an electric vehicle driver these factors have a direct effect on the vehicle’s range and the charge rate of the battery.

Within battery design Energy Density is heavily determined by the choice of chemistry and the amount of material which can be ‘packed’ into a given volume and the surface area of the material.The growth of Lithium ion in mobiles and PCs was largely due to the energy density of the technology which significantly outperforms other, more traditional, chemistries.Whilst lead acid and nickel metal hydride have significantly lower production costs than Lithium ion they cannot deliver the performance of Lithium ion.

M55342K03B10D5RWB_Datasheet PDF

One of the major factors affecting Power Density, and hence the battery charge/discharge rate is the material Solid State Diffusion Length (SSDL).Since ions in the electrolyte must transfer into the electrode material it is advantageous to reduce the SSDL and hence increase the battery’s Power Density.The surface area of the material is also an important consideration.

Other chemistries, such as Zinc Air are in research; however, for 1st generation electrification Lithium ion is likely to be the chemistry of choice.

University of Michigan computer science and engineering professor Kang Shin and doctoral student Xinyu Zhang will present their power management approach at the ACM International Conference on Mobile Computing and Networking in Las Vegas on September 21st.

Even when smartphones are in power-saving modes and not actively sending or receiving messages, they are still on alert for incoming information and they're searching for a clear communication channel. The researchers have found that this kind of energy-taxing idle listening” is occurring during a large portion of the time phones spend in power-saving mode — as much as 80 percent on busy networks. Their approach could make smartphones perform this idle listening more efficiently. It's called E-MiLi, which stands for Energy-Minimizing Idle Listening.

To find out how much time phones spend keeping one ear open, Shin and Zhang conducted an extensive trace-based analysis of real WiFi networks. They discovered that, depending on the amount of traffic in the network, devices in power-saving modes spend 60 to 80 percent of their time in idle listening. In previous work, they demonstrated that phones in idle listening mode expend roughly the same amount of power as they do when they're fully awake.

E-MiLi works by slowing down the WiFi card's clock by up to 1/16 its normal frequency, but jolts it back to full speed when the phone notices information coming in. It's well known that you can slow a device's clock to save energy. The hard part, Shin said, was getting the phone to recognize an incoming message while it was in this slower mode.

We came up with a clever idea,” Shin said. Usually, messages come with a header, and we thought the phone could be enabled to detect this, as you can recognize that someone is calling your name even if you're 90 percent asleep.”

The touchscreens sensors are scanned in order to detect any change in sensor capacitance to detect an finger touches. The data is analyzed to identify gestures, finger range, and finger direction movement.The system may also drive output devices like LEDs, or control motors.

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