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DENSO develops Li-ion battery pack for stop/start systems

Global automotive supplier DENSO Corporation has developed a lithium-ion battery pack that further increases the fuel efficiency of vehicles equipped with stop/start systems. The new battery pack allows the stop/start system to use more regenerative power than current conventional systems that use a single lead-acid battery. DENSO’s battery pack consists of a battery management unit and power supply control switch, as well as battery cells that are provided by a third-party source.

Cutaway model of Lithium-ion battery pack. Click to enlarge.

The new battery pack is air-cooled and therefore does not require a dedicated battery cooling system. Because there is no need for auxiliary cooling components, this allows the battery to be lighter and more compact. This enables automakers more design flexibility, which is important for vehicles with limited space, DENSO notes.

The pack weighs 2.5 kg and is 200 × 178 × 70 mm (length × width × height).

DENSO has developed different types of starters to meet the specific needs of its customers for their stop/start systems, including the Advanced Engagement (AE) Starter; Permanently Engaged (PE) Starter; and Tandem Solenoid (TS) Starter. Also, DENSO developed a Cold Storage (CS) Evaporator which increases the effectiveness of idle-stop, particularly at high temperatures.



My concern would be for cold weather performance, an area where AGM batteries perform better than most lithium chemistries.


would imagine that the ice WOULD KEEP THE LITHIUM warm enough with mild ducting.


Cold weather can normally be managed more easily than very hot weather. It will not take much energy to keep a well insulated small battery box above -20C. Nissan=Leaf as done it. Cooling it in down town traffic on a very hot day may be more of a problem.


They don;t say what them mean by "more regenerative power", but I assume they mean regenerative braking.

They don't say what the capacity of the battery is, maybe it is variable.

A stop/start system which could absorb braking energy would be very useful and would save a lot of power - not as much as a full hybrid, but better than a simple stop/start.


To significantly capture and use more braking energy requires larger or higher capacity starter/alternator and e-energy storage unit.

HEVs, PHEVs and BEVs are inherently more suited because they are equipped to store and use more captured energy.


What's the battery capacity? Price? Recyclable? Number of charge/discharge cycles before replacement?

Why bother with a battery article and no electrical specifications?

Unless it's secret, like having a President who hides his money from his county's taxes.

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