TonyWilliams
Well-known member
I have a source of batteries that come in 18kWh modules.
They can also be heated / cooled, just like the current RAV4 EV, and they are cylindrical 18650 cells. Each module is 42.5" x 18" x 8".
The problems with this are as follows:
1) maximum voltage is a little below what the current pack is (90 in series instead of 92)
2) need to develop a BMS for the pack (Orion?)
3) need to add heating / cooling
4) need to develop mount
With about 70kWh usable onboard (two 18kWh packs) with the following ground speeds, and a composite 40kW charger rate to fill 50kWh useable each time requires 1.25 hrs at a CHAdeMO station.
Optimal speed is 75mph for lowest time traveled with 80% SOC charges, and traveling at 90-95% of the available range:
55mph - 4.0 miles/kWh * 70kWh = 280 miles @ 70% = 196 / 55mph = 3.6 hrs + 1.25 = 4.85hr = 40.4mph
65mph - 3.4 miles/kWh * 70kWh = 238 miles @ 70% = 166 / 65mph = 2.7 hrs + 1.25 = 3.95hr = 42.0mph
75mph - 2.7 miles/kWh * 70kWh = 189 miles @ 70% = 132 / 75mph = 1.7 hrs + 1.25 = 2.95hr = 44.7mph
85mph - 2.0 miles/kWh * 70kWh = 140 miles @ 70% = 98 / 85mph = 1.2 hrs + 1.25 = 2.45hr = 40.0mph
In a nutshell, two packs are proposed:
$12,000 rough estimate - 18kWh / 15kWh usable
$21,000 rough estimate - 36kWh / 30kWh usable
One 18kWh module will fit entirely in the third row footwell (the footwell must be cut out). The floor of the trunk would remain flat.
The second module would fit directly on top of the first module, raising the trunk floor by approximately 9".
All heaters / air conditioning compressors can fit in the rear corners.
Going forward to the front on the vehicle would be:
1) two DC cables tied to the main traction battery
2) isolation relay to separate the two packs
3) air conditioning high pressure lines to the additional radiator in the front
4) 12 volt power for the battery heater
5) 12 volt power for BMS
_________________
They can also be heated / cooled, just like the current RAV4 EV, and they are cylindrical 18650 cells. Each module is 42.5" x 18" x 8".
The problems with this are as follows:
1) maximum voltage is a little below what the current pack is (90 in series instead of 92)
2) need to develop a BMS for the pack (Orion?)
3) need to add heating / cooling
4) need to develop mount
With about 70kWh usable onboard (two 18kWh packs) with the following ground speeds, and a composite 40kW charger rate to fill 50kWh useable each time requires 1.25 hrs at a CHAdeMO station.
Optimal speed is 75mph for lowest time traveled with 80% SOC charges, and traveling at 90-95% of the available range:
55mph - 4.0 miles/kWh * 70kWh = 280 miles @ 70% = 196 / 55mph = 3.6 hrs + 1.25 = 4.85hr = 40.4mph
65mph - 3.4 miles/kWh * 70kWh = 238 miles @ 70% = 166 / 65mph = 2.7 hrs + 1.25 = 3.95hr = 42.0mph
75mph - 2.7 miles/kWh * 70kWh = 189 miles @ 70% = 132 / 75mph = 1.7 hrs + 1.25 = 2.95hr = 44.7mph
85mph - 2.0 miles/kWh * 70kWh = 140 miles @ 70% = 98 / 85mph = 1.2 hrs + 1.25 = 2.45hr = 40.0mph
In a nutshell, two packs are proposed:
$12,000 rough estimate - 18kWh / 15kWh usable
$21,000 rough estimate - 36kWh / 30kWh usable
One 18kWh module will fit entirely in the third row footwell (the footwell must be cut out). The floor of the trunk would remain flat.
The second module would fit directly on top of the first module, raising the trunk floor by approximately 9".
All heaters / air conditioning compressors can fit in the rear corners.
Going forward to the front on the vehicle would be:
1) two DC cables tied to the main traction battery
2) isolation relay to separate the two packs
3) air conditioning high pressure lines to the additional radiator in the front
4) 12 volt power for the battery heater
5) 12 volt power for BMS
_________________
