What are the uses of a battery that can operate at -40 ℃?

[Steve_J]

【Questionnaire Investigation】
The new type of sodium ion battery has excellent environmental adaptability. They can work in an environment of -40~80 ℃.
So where will they be used? Where will you use them?
Which would be more popular, prismatic or cylindrical?

 

[gpn]

Well it was -32F here a couple weeks ago and my weatherflow weather station just kept chugging along with it's solar powered LTO cell. So that is pretty close to the bottom limit of this battery. Could work for backup power for comm equipment or similar during very cold spells.

 

[harrisonpatm]

I'd like it for headroom: if the battery is rated for -40 C, then when it gets too -10-20 during my winters I'd know that the cells are still well within their parameters

 

[OffGridInTheCity]

I follow a few Alaskan dwellers and they either go with lead-acid in a power shed or put lithium in the cabin w/heat. Looks like these could work in an Alaskan power shed to replace the lead-acids as -40F is pretty low and even it it's -50F or -60F outside, the shed will provide some protection and/or greatly minimize the amount of heat needed in the shed - e.g. a 100lb propane tank / heater set to fire/maintain at least -30F would probably last all winter.

 

[prepared1]

I like LTO for its capabilities like cycle life, low temp operation use and charging, etc. It was -30F here in Iowa 12 days ago...

 

[100kwh-hunter]

When temps are going below freezing point my powerwall will shut down.
So yes create a solution for a problem we created ourself...heating up a powerwal to save money that we wanted to save in the first place....
Below +3c i must buy my power from the grid, also above +40C.

So the benefit for me would be obvious: i like to cool and warm up my house instead of my powerwall

 

[909]

I built a cabin where it can get to -30 degrees celcius ( sometimes more depending on the wind chill ) .
It would be nice, to have a chemistry that works in these conditions instead of carrying the heavy batteries in and out of the cabin with every winter visit .

 

[Steve_J]

I'd like it for headroom: if the battery is rated for -40 C, then when it gets too -10-20 during my winters I'd know that the cells are still well within their parameters

Sorry, I just finished my longest vacation of the year.

The low-temperature parameters of batteries of different models may vary. The low-temperature discharge performance of large batteries is generally higher than that of small batteries.

For example, the battery shown in the figure, the test results show that the available capacity is ≥ 85% at -30 ℃ and ≥ 75% at -40 ℃.
Taking 33140 as an example for cylindrical batteries, it is ≥ 80% at -30 ℃ and ≥ 70% at -40 ℃.

 

[Steve_J]

I like LTO for its capabilities like cycle life, low temp operation use and charging, etc. It was -30F here in Iowa 12 days ago...

Undoubtedly, the lifespan of LTO is much higher than that of other batteries.
But SIB has a significant price advantage, and I believe LTO is more suitable as a special type of battery. SIB is something that most people can use.

 

[Steve_J]

Well it was -32F here a couple weeks ago and my weatherflow weather station just kept chugging along with it's solar powered LTO cell. So that is pretty close to the bottom limit of this battery. Could work for backup power for comm equipment or similar during very cold spells.

If considering low temperatures, I believe SIB will be very effective.
However, if used for long-term maintenance free equipment in remote locations, the lifespan advantage of LTO is even more pronounced.

 

[100kwh-hunter]

Or go back 40 years in time and collect NiMh cells.
Minimum charge temp is -5 Celsius and minimum discharge temp is -30 Celsius.
Two major drawbacks< they need a special min/max cycle (depending on use) every 6 months to prevent them getting lazy and the are not high c.