Lighter than nickel-metal hydride battery 1 / 2
The advantages of lithium-ion rechargeable battery, simply, is the weight, the volume of single nickel-metal hydride (Ni-MH) rechargeable batteries for about half of the same performance can be achieved. Battery performance generally energy per unit weight and power to express, lithium-ion rechargeable battery weight of the unit of energy density (the density, particularly related to driving distance EV) and density Power (HEV related to the ease of loading and unloading) are Ni hydrogen battery 2 times.
Sanyo Electric said that the development of batteries for the Audi, the power density and energy density of nickel-metal hydride battery has reached 2.3 times. Similarly, the AESC batteries have met twice, with a view volume is expected to reach 2.3 times.
In the current research and development of hybrid electric vehicle, EV, PHEV three types of electric vehicles, the level closest is known as HEV. A current system used in nickel-metal hydride batteries last with “Prius” is also used in VGP-BPS11 battery capacity, for example, is only about 1.3kWh.
On the other hand, EV and prototype plug-in hybrid car finally debuts. In the EV field, the real production vehicle wills i MiEV and Plugin Stella Concept, mass-produced performance indicators form. At this point, the battery capacity, even the light vehicle i MiEV, must also 12.3 times 16kWh Prius.
EV drivers must all rely on battery power, if the most stringent requirements of the battery. HEV is usually on the battery state of charge (SOC) 50% of the center, the battery in his field of work up and down about 10% use EV to the need of increase drastically.
However, CO2 (carbon dioxide) point of view, EV HEV benefits. Projections of Sanyo Electric, HEV 10.15 CO2 emissions in the way of 123g/km, while the EV is 49g/km, can be reduced to the old 1 / 2 below.
PHEVs can be equipped with more than HEV batteries, to extend the distance between the travel requirements for HEV batteries used between the VGP-BPL11 battery and EV batteries. Nissan EV development experience, EV electricity required to travel in the vehicle when the weight of 1.7t level 150 ~ 250Wh/km. If 1.3kWh Prius battery, uses 20% of the SOC, then insofar as we can only travel less than 2km.
The prototype hybrid Prius was rechargeable nickel-metal hydride rechargeable batteries to double the size and obtained parallel 2.6kWh capacity, extend the use of CTP to 20 ~ 80%, allowing a battery driving distance for 13km reach. If we replace its lithium-ion rechargeable Ni-MH rechargeable batteries that half the weight, you can achieve the same performance of the hybrid battery.
HEV and EV requirements of the different characteristics of
The characteristics of the battery in HEV, EV, PHEV three types of cars on the What is the difference? The data, for example by Toshiba, the company has developed HEV batteries, the power density reached 3800W/kg belong to the attention of powerful type. Although the secondary and renewable power to speed access to aspects of the application HEV-flow current in a short time, but without a long-Powered Battery lead for the energy density is one of the lower levels .
The EV just the opposite. Notwithstanding the need for more 100Wh/kg high energy density, but not if the energy needs of high density. The performance indicators are among the PHEV range of hybrid electric vehicles and Ev. With the hybrid rechargeable VGP-BPS13A/B battery from Toshiba, for example, the objective now is to 1300W/kg power density, energy density of 120Wh/kg