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System stores, converts energy in idle-stop vehicles

19 Feb 2013

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Panasonic 12V Energy Recovery System

Japanese electronics company Panasonic Corp. had announced that it has developed a system for idle-stop vehicles that stores energy produced by braking to power electrical components in the vehicle. The 12V Energy Recovery System is designed to save fuel and uses nickel metal hydride (Ni-MH) batteries.

Based on Panasonic's technology in the development of batteries for hybrid electric vehicles (HEV), the new battery cells offer higher charging efficiency and durability under high temperatures, compared to existing Ni-MH battery cells. That increases flexibility in the installation of the system, as it can be placed in the engine compartment which reaches high temperatures.


1. This system is designed to complement the performance of main lead-acid battery by supplying power to the vehicle's electrical components as well as the drive assist motor, thus increasing the functionality of idle-stop systems and improving fuel economy.

Panasonic 12V Energy Recovery System

Figure 1: Concept Diagram of 12V Energy Recovery System

2. The new system employs Ni-MH batteries that can be fitted to existing idle-stop systems without the use of a transformer. Outstanding high temperature performance enables installation inside the engine compartment.

3. Contribution to increased service life of the main lead-acid battery. Tests conducted by Panasonic, using a 12V Energy Recovery System together with a lead-acid battery, have confirmed that the service-life of the main battery was extended by approximately six times compared to when a lead battery was used alone. This figure is based on results of charge/discharge life tests for idle-stop (SBA S0101) conducted at 60°C ageing conditions. A Panasonic lead-acid battery (Q-55) and 12V Energy Recovery System were used.

 Panasonic 12V Energy Recovery System

12V Energy Recovery System
Battery: 10 x D size Ni-MH battery cells

Voltage: 12 V

Capacity: 6 Ah

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