Adding A Second HV battery Smart Electric Drive ? - Smart Car Forums
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post #1 of 19 (permalink) Old 04-01-2015, 10:40 AM Thread Starter
 
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Adding A Second HV battery Smart Electric Drive ?

Hello all,

So after driving my 2014 smart electric for just over a year I love it but there are some times I wish I could change . I have done some minor Modifications to it to make it sportier and such but have been thinking long and hard about ways to increase the overall range . I generally see an average of 120-140 km's per charge depending on how hard I drive it and where I drive it . I was thinking it might be possible to build myself another smaller battery pack and hook it up to the existing pack ? Any idea's ? has anyone attempted this with another factory electric car . I want to leave it pure electric and do not want to run a generator behind it ( stupid idea if your going green in the first place ) . What are you thoughts on this ?
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post #2 of 19 (permalink) Old 04-01-2015, 11:11 AM
 
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I nominate this for SFIOTD.

This would certainly void the warranty. There is really nowhere on the outside of the car to safely put more batteries. How much experience do you have working with dangerous voltages?
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post #3 of 19 (permalink) Old 04-01-2015, 11:20 AM
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Any idea's ? What are you thoughts on this ?
Just say NO!
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post #4 of 19 (permalink) Old 04-01-2015, 11:24 AM Thread Starter
 
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well I have been a mechanic now for 10 years . Speciality was working on electric and hybrid systems . Now I currently work for Tesla Motors ... So quiet a fair amount my boss is an electric engineer as well so he might be able to help me out some . I was thinking of using some small form lithium ion based packs and use the rear trunk space for this . Loose some you win some . EV west dot com actually has some really nice small packs. Not cheap but if i got 5 of them i would double the current battery capacity and add another 15 KW battery . obviously doing this i would need to increase the onboard charger.

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Capacity: 57Ah, 3kWh
Height: 7.25 Inches
Width: 2.875 Inches
Length: 39.0 Inches
Weight: 42 Pounds
Bolt Size: M6
Voltage nominal: 3.8V/Cell, 57.0V/Module
Charge voltage cut-off: 4.2V/Cell, 63.0V/Module
Discharging cut-off: 3.3V/Cell, 50V/Module
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Warranty Period: One year

Lithium Ion 18650 EV Module - 57 Volt, 3kWh, EV West - Electric Vehicle Parts, Components, EVSE Charging Stations, Electric Car Conversion Kits
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post #5 of 19 (permalink) Old 04-01-2015, 11:27 AM Thread Starter
 
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and Huronlad I nominate this for SFIOTD. is kind of a rude comment .. just saying no need to be a dick . People do engine swaps that are way more complex . Electric Drive system are much simplier in a whole then the standard combustion engine.
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post #6 of 19 (permalink) Old 04-01-2015, 11:52 AM
 
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So you want to mate a 57V pack up with a 344V pack, and stick it in the passenger compartment, have fun with that.
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post #7 of 19 (permalink) Old 04-01-2015, 11:58 AM Thread Starter
 
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no no... you have to get enough of them and run them in series so they match the HV batteries voltage . Then you have to program it all so it recognizes the added KW's . Basically build a smaller more compact version of existing pack . It is entirely possible . just trying to see if anyone else has tried this on the smart electric vehicles .
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post #8 of 19 (permalink) Old 04-01-2015, 12:03 PM
 
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I know what would have to be done, it did not appear that you did. 5 x 57V is not 344V.
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post #9 of 19 (permalink) Old 04-01-2015, 12:09 PM Thread Starter
 
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True lol that was just for reference though i would need to combine multiple battery packs to get exact voltage numbers . It would be alot of work but if i could double the range . getting almost 300 km's out of a single charge think it would be quiet the pay off . Maybe beef up the motor or change the firmware in the motor itself to account for the extra weight .
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post #10 of 19 (permalink) Old 04-01-2015, 12:17 PM Thread Starter
 
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It's a big job i realize and it might not be possible at all but I figured it would be worth a look into it . If its something that can be done more than worth it to say my electric smart gets the same range as a 40kw Tesla
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