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Old 08-10-2004, 12:07 PM   #1906
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Actually the voltage loss on a Pro Match stick is VERY small. As Neil stated the way they do it is different and much better.
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Old 08-10-2004, 12:39 PM   #1907
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I have personally watched them assemble stick packs and unless they have changed things in the last 30 days, what I said before is true.
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Last edited by jsp; 08-11-2004 at 08:29 AM.
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Old 08-11-2004, 01:05 AM   #1908
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They let you watch them assemble packs?
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Old 08-11-2004, 04:46 AM   #1909
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Old 08-11-2004, 05:08 AM   #1910
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Quote:
Originally posted by jsp
Stick packs have very thin tabs between the cells and are spot welded. Side by side packs have thick low resistance bars and hopefully are well soldered. I have tested a stick pack at 20 amps for average voltage. Then disassembled the pack and put it back together using Deans bars. When I retested the pack, the voltage gained .2 volts. As the amps go up this voltage loss increases. But remember, stick packs usually go in play cars and the voltage losses are not seen.
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Well spoken and nice work.

Mounted in a car for stock racing, 0,2 volts is quite a lot. 20 amps is close to the average amp draw of an stock motor, so the example is realistic. And 0,2 volts equal 0,03 volt pr. cell (6-cells pack). The voltage difference between a Promatch pack 1,150-1,159 and 1.175-1.179 is close to that total pack 0,2 volt difference. But the price doubles...

But again, in a play car, it wont matter...
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Old 08-11-2004, 05:27 AM   #1911
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Cole-
True, but not everyone who uses a stick pack puts it in a play car. Tamiya's F201 and Mini class cars both have to use stick packs. Those of us who race these cars seriously have had to come up with ways to manage our cells and circumvent the voltage loss- which as you point out can be quite sizeable.

It would be nice if someone like ProMatch could do this...

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Old 08-11-2004, 08:28 AM   #1912
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Neil: Yes they let me watch. I have also watched them assemble packs in the side by side configuration using the inductive soldering. That system is water cooled and makes no contact with the cells or battery bars. The solder and flux is applied with a syringe. The operator hits the foot pedal, a little smoke (from the flux) rises and it's done. The finished solder job is so clean, it looks like it was super glued together. BTW, I talked to Steve at Promatch yesterday and stick packs are still assembled with the thin tabs and spot welding. This is industry standard. The tab has to be very flexible because it will be folded in half. Spot welding is used because there are similar materials and soldering is not required. I believe the tab itself is where the resistance difference is.
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Old 08-11-2004, 11:58 AM   #1913
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Old 08-11-2004, 05:11 PM   #1914
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Quote:
Originally posted by jsp
Neil: Yes they let me watch. I have also watched them assemble packs in the side by side configuration using the inductive soldering. That system is water cooled and makes no contact with the cells or battery bars. The solder and flux is applied with a syringe. The operator hits the foot pedal, a little smoke (from the flux) rises and it's done. The finished solder job is so clean, it looks like it was super glued together. BTW, I talked to Steve at Promatch yesterday and stick packs are still assembled with the thin tabs and spot welding. This is industry standard. The tab has to be very flexible because it will be folded in half. Spot welding is used because there are similar materials and soldering is not required. I believe the tab itself is where the resistance difference is.
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Promatch should video tape it and show us all. PMRGirl, what do you think?
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Old 08-11-2004, 05:14 PM   #1915
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That's a good idea. Maybe a small video on the website showing the assembly process.
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Old 08-12-2004, 06:26 AM   #1916
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Yeah! OOOOOkayyyyyy!
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Old 08-12-2004, 09:02 AM   #1917
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Chilly: You coming this weekend? The weather should be nice!
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Old 08-12-2004, 11:31 AM   #1918
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I'm not sure. I need to stay in town this weekend.
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Old 08-12-2004, 11:51 AM   #1919
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thats cool...
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Old 08-12-2004, 12:49 PM   #1920
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We're home from the hospital now, but I don't think I will make it Saturday... Maybe a stop by to say hi, but that might be pushing it. Looks like I will miss awesome weather for a race.
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