36V 10Ah Lithium Battery / How to test?

[marty]

Getting 4 - 36V 10Ah Lithium Batteries. Will wire in parallel and series to get 72V 20Ah

How should I test them? Been busy building a bomb shelter. Do Lithium Batteries explode and catch on fire during charging? Discharging? When?

Remember reading on this forum about someone using light bulbs and sockets wired in series to create load to test batteries. They used parts from Allied Electronics http://www.alliedelec.com Search and can not find information.

Want to test each 36V 10Ah Lithium Battery Pack separately.

Thanks for all your help with Electric Bike Project # 2

 

[fechter]

Do the batteries have a BMS built in?

Most fires occur due to overcharging or physical damage as far as I can tell. Overdischarge below the minimum recommended voltage is bad too.

During discharge, it would be good to have the load automatically disconnect when the low voltage limit is reached. I think Matt used a relay and a resistor to make something like that. A BMS usually has this feature built-in.

It's also cool if you can accurately measure how much energy you actually get out of the pack during testing. If you're not around when the battery runs out, you might not know how long it lasted. A DrainBrain kind of thing would be ideal.

 

[marty]

Do the batteries have a BMS built in?

BMS = Battery Management System?
Think 36V 10Ah packs do have BMS. Will know for sure when I receive.

A DrainBrain kind of thing would be ideal.

OK will buy one.

 

[Ypedal]

Hey marty , what battery did you buy exactly ?

 

[marty]

Hey marty , what battery did you buy exactly ?

Really not sure? Will know exactly what I got after I get, if I can figure out what I got after I get? Will take pictures, and you all can help with identification.

 

[maytag]

Getting 4 - 36V 10Ah Lithium Batteries. Will wire in parallel and series to get 72V 20Ah

How should I test them? Been busy building a bomb shelter. Do Lithium Batteries explode and catch on fire during charging? Discharging? When?

Marty,
I've read about so many lithium fires, enough to literally scare me into building my pack with emoli cells. Most flare ups were caused by the so called SMART chargers detecting the wrong number of cells, thinking its charging 7s when actually the pack is a 6s for example. For testing it would be good to have a DrainBrain.

 

[marty]

Still working on the bomb shelter. Still waiting for battery shipment. Now I need some type of electrical load to test batteries. This is what the electrical wizard and I come up with.

Parts from http://www.newark.com
________________________________________
RESISTOR
Manufacturer: CLAROSTAT
Newark Part Number: 03F6500
Manufacturer Part No: CMC5030

Description
Wirewound Resistor
Series:CMC
Resistance:30ohm
Resistance Tolerance:+/- 1 %
Power Rating:50W
Temperature Coefficient:+/-20 ppm
Terminal Type:Axial Leaded
Packaging:Bulk
Resistor Element Material:Ceramic
________________________________________
LAMP SOCKET
Manufacturer: SPC TECHNOLOGY
Newark Part Number: 81N2563
Manufacturer Part No: LSL-11-463

Description
Lamp Socket
Terminal Type:Solder Lug
Body Material:Zinc and clear plated
Contact Plating:Electro Tin Over Copper Flash
For Use With:Miniature Bayonet Base Lamp
Lamp Holder Type:Miniature Bayonet Base
________________________________________
LAMP
Manufacturer: SPC TECHNOLOGY
Newark Part Number: 50N8144
Manufacturer Part No: 1822

Description
Incandescent Lamp
Voltage Rating:36V
Bulb Size:T-3 1/4
Lamp Base Type:Miniature Bayonet
Average Rated Bulb Life:1000h
Bulb Length (MOL):1.19"
Current Rating:0.100A
Length:1.19"
Luminous Intensity (MSCP):2.1
________________________________________

Test each 36V 10Ah battery separately

Use:
Resistor 30ohm
Lamp Socket
Incandescent Lamp 36V 0.1A

Resistor and Lamp wire in parallel

36V / 30ohm = 1.2A + 0.1A lamp = 1.3A
10Ah battery should last about 7.7 hours with 1.3A load

Will also connect an Ammeter in series and a Voltmeter in parallel with the battery and take the data.

Is this a good way to test Lithium Batteries?

Figured out how to up-load pictures to endless-sphere.com/forums! See drawings of parts.

 

[Ypedal]

It does not have to be so complicated.

A quick trip to Home Depot, piece of 2x4 , a few light-bulb fixtures.. i just happened to have all that stuff in my garage already... Some anderson conectors and Voila.

 

[marty]

4 - 36V 10Ah Lithium Batteries shipped today. Today is tomorrow in China. Wonder if they will arrive yesterday? Depends on which way they travel around the earth? What is a Endless Sphere?

 

[TylerDurden]

What is a Endless Sphere?

A very generous person, "knightmb"...
who provides this BBS to the community.

http://endless-sphere.com/

 

[marty]

A very generous person, "knightmb"...
who provides this BBS to the community.

Thanks Knightmb, for helping to spread knowledge on Electric Vehicles.

 

[Mathurin]

What is a Endless Sphere?

Truth is Endless-Sphere
Endless-Sphere is now
Bow to the Endless-Sphere

For more details regarding the grand imperial dynasty, see here:

http://endless-sphere.com/forums/viewtopic.php?t=446

here too:
http://endless-sphere.com/forums/viewtopic.php?t=628

And this also:
http://endless-sphere.com/forums/viewtopic.php?t=313

And of course:
http://endless-sphere.com/index.php?option=com_content&task=view&id=17&Itemid=34