Vehicle battery management system requirements,laptop battery charging off,auto battery discount coupon 40 - Step 1

25.01.2015
Compared to flooded lead-acid batteries, lithium iron phosphate batteries pack in more energy per physical size and weight.
A battery management system protects its cell by shunting current around it when it is full. The truck’s in-cab battery monitors show battery state-of charge (top), and BMS cell voltage and temperature (bottom).
IntermediateIn 2007, I converted a GMC Sonoma from its original gasoline propulsion to pure electric, using flooded lead-acid (FLA) batteries (see “Born to be Wired” in HP122).
However, the battery weight (approximately 1,800 pounds) brought the vehicle very close to its maximum gross weight of 5,000 pounds. This undoubtedly contributed to a shorter life, but the nail in their coffin occurred when I was unexpectedly called away for several weeks during the summer.
I didn’t realize this until I tried to drive my vehicle and heard a “bang” in the battery box, and the vehicle lost power.
Because I wanted my next battery pack to give me better service, I started investigating lithium iron phosphate (LFP) batteries, which had dropped in price significantly—from $75,000 for a 31 kWh pack in 2006 to $12,000 in 2010 (since then, prices have remained fairly constant). Switching to LFPs shaved almost 1,000 pounds from the vehicle, more than doubled the vehicle’s range, gained back the vehicle’s original acceleration, and nearly halved its energy use per mile. My converted electric GMC Sonoma pickup was featured in the article “Born To Be Wired” in HP122. Anniel, Lithium batteries are still 10 times safer than gas and millions safer than lead acid. With cooling on lithium batteries like my FORD Focus EV I think the batteries will last 16-20 years. Government testing show a 10-20 year life mostly depending on temperature and of course no running them way down or over charging. For battery measurement systems, we offer analog ICs, power devices and MCUs with built-in vehicle communication function. The very latest technology, the safest Lithium-ion cells and currently the lightest weight battery on the market with a guaranteed service life of 400,000 km.


The battery management system (BMS) continuously monitors each battery module and transmits all data via CAN to the vehicle. The 22 kW quick charger lets you fully charge the batteries within one hour, using a standard domestic mains socket. The Merlin DataCell II enables vehicle users to understand (at any given point in time) exactly how much electrical energy they have available to them and how long they can continue to run for without starting an engine or APU.
DataCell II uses a blend of traditional battery monitoring methods (enhanced by Merlin) and unique mathematical models & algorithms (written for specific battery types) to accurately measure and trend battery state of charge and health more accurately than ever possible before. At the same time, particular attention has been paid to the electronic design of the system to ensure that DataCell II does not present an unacceptable power drain in its own right. The type of FLA batteries most commonly used for EV conversions, golf cart batteries, have three 2 V cells and a capacity ranging from about 200 to 260 amp-hours (Ah). I expected my batteries to have a five-year life, but in the third year, they started to show signs of failure.
I knew that the best practice for FLA batteries is to re-water them monthly if they are being cycled frequently (as they usually are in an EV). In my original design, a daily timer was set on the battery charger to ensure the batteries were fully charged before I left on my morning commute.
Several of the batteries in the middle of the pack (those that got the hottest) had swollen—one had swollen enough to cause an internal short circuit, which ignited the gasses at the top of the battery. A comparable FLA bank was more affordable (about $5,000), but I was convinced that Li-ion batteries would improve vehicle performance (power, acceleration, range, and energy economy) and render a long-term payoff. To see why I experienced such a dramatic improvement, we need to compare the batteries themselves. The LFP reference batteries are high-capacity (180 to 200 Ah), 3.2 volt prismatic batteries.
Bluecar in Italy does it and gets 150 miles per charge with a MiEV Mitsubishi sized vehicle.
A key safety feature of this system is that it automatically isolates a battery modules from the vehicle circuit if it exceeds or falls below set limit values.


Put together high quality components and the highest level of expertise in the ideal combination to produce optimum solutions. DIYTrade accepts no responsibility whatsoever in respect of such content.To report fraudulent or illegal content, please click here. It also allows maintenance teams to identify and swap out batteries that are in poor health before they fail in service, potentially endangering the mission and the crew. For a maximum four battery bank installation, the system consumes no more than 10mA (1.6Ah a week) for its CPU and sensors combined. Moving the truck’s 3,200 pounds required a higher voltage than the 96 or 120 volts commonly used for lighter-weight vehicles, so I used 24 batteries for 144 V and an energy capacity (at 100% discharge) of about 37 kilowatt-hours (kWh). Lithium is also considered non toxic by the EPA but do have 2nd life as solar back up and are recycled!
I was usually good at watering the batteries, but on a few occasions, I postponed it, only to find that enough of the electrolyte had evaporated to expose the top of the lead plates to air. This boiled off a significant portion of the electrolyte and overheated the batteries, causing them to swell. But after testing, I found that all of the remaining batteries had a significant reduction in capacity—the only solution was to replace them all. In comparing, keep in mind that a golf-cart battery has three cells for about 6 V, whereas the LFP prismatics come as single cells (packs of 4 cells for 12 V are also available). Exposed lead oxidizes, making it harder for the plates to interact with electrolyte and, thus, reduces their capacity. The comparison table values based on watt-hours (Wh) provide an apples-to-apples comparison because they relate to stored energy. Except where noted, the table characteristics come from manufacturers’ specification sheets.



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Comments Vehicle battery management system requirements

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  3. warlock
    Through that information quickly both under and over-charging taken into account when sizing the system.