 |
|
|
HEV battery is used as supplementary power. When vehicles depart or accelerate rapidly, it supports the engine and optimizes driving efficiency of gasoline engine. Thus, it improves two times of the distance per a liter that cars can run and reduces polluted substances released by 50%.
HEV battery is divided into nickel hydrogen battery and lithium ion battery. Nickel hydrogen battery is already commercialized and on sale. On the other hand, lithium ion battery is under development in worldwide various corporations in order to commercialize afterwards.
Lithium ion battery has larger output, compared to nickel hydrogen battery and it is light, contributing to compacting of vehicles, which are the merits. In this light, Samsung SDI is progressing the development.
 Output should be large. |
When a hybrid electric car departs or travels on the hill or in a high speed, the motor is running.
At this, Lithium ion battery should be able to supply energy in a moment ( 2-3 seconds to 1 minute approximately) to the motor. Thus, it requires 5 times higher output than batteries for mobile phone.
|
|
| Life span should be long. |
|
During the utility period of a hybrid electric car, there should be no replacement of HEV battery. So, it should have a long lasting life span of utility period of 15 years, distance covered of 25,000 Km and cycle life span of over 300,000 times.
|
|
| Safety should be excellent. |
|
The battery must be safe since it has as large as capacity of output to move a car and as much current should be charged. Thus, it should be safe despite as much as current. And also when the car collides, it should not catch fire by shock.
|
|
| It should be cheap. |
|
Use of HEV battery brings out the reduction of distance covered per a liter and the quantity of air pollution released, but if the battery price is higher than such a profit, commerciality declines. Therefore, the HEV battery should be cheap.
|
|
|
|
