Today to talk to you about an ideal ONE topic, friends who have paid attention to the ideal ONE car should know that the ideal ONE has a driving mode called ejection start, the engine will also start when the ejection starts, it is said that in order to optimize the user experience of the ejection start, the ideal ONE has made a lot of efforts to minimize the noise and jitter effects caused by the engine when the ejection starts.
So why does the ideal ONE have to start the engine when the ejection starts?
Many friends will say, is this not nonsense, isn't the start of the catapult to maximize the power output? Since the ideal ONE has an engine, of course, it is also necessary to start the engine to work together, so that it can start faster!
The question is certainly not that simple?
If it is BYD's DMp or DMi system, it is designed with an engine direct drive mode, starting the engine when the ejection starts, and the power of the engine and the motor can be superimposed.
Maximum output power = motor power + engine power
Starting the engine at the start of the catapult is indeed a way to get more power, allowing the car to start faster.
BYD Tang has two 110kW front and rear motors and a 151kW engine, so that the combined maximum output power can reach 371kW, and the maximum power obtained by starting and not starting the engine at the start of the catapult is much different.
The ideal ONE uses a range extender scheme, even if the engine is started, it is only used to drive the generator to generate electricity, and then co-power the power to the motor with the battery pack, the maximum power only depends on the power of the motor, for the ideal one
Maximum output power = motor power
The maximum power of the ideal ONE motor is 240kW, and the maximum power of the engine is 96kW, but regardless of the mode, the maximum power that the ideal one can output is 240kW, not 240 + 96 = 336kW.
Since the maximum power of the engine is 240kW, why is it ideal to work hard to debug a catapult starting mode that must start the engine?
Isn't it simpler to achieve maximum power output directly from battery power?
There is only one answer:
The ideal ONE's 40-degree battery cannot support an output of a maximum power of 240 kW and must be assisted by a range extender.
This involves an important parameter of the electric vehicle power battery (most electric vehicle manufacturers do not disclose this parameter of the battery used at present): discharge rate
Discharge rate, generally expressed in C, refers to the battery charge and discharge capacity multiplier. 1C indicates the current strength of the battery when it is fully discharged for one hour. As the 18650 battery labeled 2200mA·h is discharged at 1C intensity for 1 hour, the discharge current is 2200mA.
In simple terms, a 40kWh battery has a maximum output power of 240kW, that is 6C, and if the maximum output power of a 20kWh battery is also 240kW, that is 12C.
The discharge rate directly affects the cost of the battery, and the higher the discharge rate, the more expensive the battery cost.
The discharge curve and battery life are different at different discharge rates
Consulted some industry friends, just someone knows that the discharge rate of the battery used by the ideal ONE is 5.5C, that is to say, the 40kWh battery pack supports a maximum power output of 220kW, and it is almost 240kW, so the ideal ONE can only start the engine at the same time to achieve the maximum power of the ejection start.
Then the problem comes again, why can't the discharge rate of the battery be selected larger, such as 6C's can fully support pure battery catapult start?!
NIO ES8, 70kWh battery pack, the maximum output power of 480kW, discharge rate of more than 7C
BYD Tang DMp, battery capacity 19.9/23.9kWh, motor power 220kW, discharge rate of about 11C
Of course, this is a question that we as ordinary car owners cannot answer.
In the business business, the ideal ONE to choose 5.5C battery must have its own reasons and considerations, battery cost is too high, then is not it really charity?
But what about it?
As far as this problem is concerned, the ideal does not always have to flaunt itself for the sake of user experience, in order to make a good product How to do it?!
A problem that is not complicated,
If you want to give users a better experience,
Change the battery that is better,
You can achieve a start of ejection without listening to the roar of the engine,
At least on the ideal ONE, we can see that the ideal final choice is,
Prioritize cost control and then give users a less-than-perfect experience!
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