Engineers at GS Yuasa in Japan have developed a 12V lithium-ion battery targeting the start/stop systems market. The external configuration of the Li-ion battery is compatible with DIN LN5 12V lead-acid batteries, and the operational voltage range is almost the same as the lead-acid battery. Therefore, the new lithium-ion battery can physically replace a LN5 lead-acid battery in a vehicle.
|Inner structure of 019SLIB type 12 V lithium-ion battery. Click to enlarge.|
The new lithium-ion battery uses a Lithium Iron Phosphate / Graphite combination and offers advantages in comparison with the traditional lead-acid battery in terms of light weight, high power and long life.
The battery comprises four 69 Ah cells, a relay assembly, a current sensor and a battery management unit which has a LIN (Local Interconnect network) interface with the vehicle ECU (Electronic control unit).
Although the Li-ion battery can be physically dropped-in, the LIN interface protocol between the vehicle ECU and the battery management unit should be modified, and the control of the alternator should be optimized for the lithium-ion battery, the developers noted.
Daisuke Konishi, Jyunya Ueda, Toshiki Kusunoki, Osamu Ushijima, Takashi Aoki, Yoshihiko Mizuta (2013) “Development of 12 V Lithium-ion Battery for Start and Stop Vehicle System”