Lithium is engine bay (heat blankets)

[john61ct]

If charging your LFP battery is causing any significant temperature rise

you're greatly reducing its lifespan, especially in cool ambients.

Reduce your current rate, unless you **really** need to fast charge.

Good rule of thumb is 0.4C or lower.

 

[OllieChristopher]

Good rule of thumb is 0.4C or lower.

You can go much higher than that and manufacturers are figuring out how with variable C rate charging. Tesla is safely up to 4C. The reality is you can safely charge as high a rate as you wish as long as you stay within the parameters of the manufacturers temperature rating.

.4C - 1C charging is a thing of the past with thermal controlled BMS systems that charge batteries according to their temperature rating. The charging process of lithium ions passing from the cathode through the electrolyte to the anode is catching up to the oxidation "discharge" rate. Technology such as thermal resistant sold ceramic electrolytes are going to be becoming commonplace in the near future.

Quick charging with no detrimental effects is becoming more commonplace as charging/battery technology is keeping up with each other. I'm amazed at not only the solar generators but stand alone battery and BMS advancements that are allowing charge rates that were unheard of just few short years ago.

I predict in just a few years we will be seeing 10C+ charge rates on 500+amp hour battery banks and under one hour full charge from full discharge.

 

[john61ct]

Yes "safely" as in no danger.

Maximizing longevity is completely different from EV industry goals.

Pre-heating the pack (from the outside of the cells) indeed allows for reducing the damage* done by higher rates.

Anyway, I stand by my statement

significant heat **generated internally** by the chemical processes, is a sign of damage being done.

If the use case does not **require** the high C-rate, your bank will last longer reducing it.


*reduction of life cycles = damage

 

[OllieChristopher]

Ahh OK John, I see where you are coming from now. My point is that heat is becoming less of an issue as technology advances. Reduction in life cycles can be an issue for sure if the cells cannot handle the heat.

 

[broncobowsher]

You can go much higher than that and manufacturers are figuring out how with variable C rate charging. Tesla is safely up to 4C. The reality is you can safely charge as high a rate as you wish as long as you stay within the parameters of the manufacturers temperature rating.

.4C - 1C charging is a thing of the past with thermal controlled BMS systems that charge batteries according to their temperature rating. The charging process of lithium ions passing from the cathode through the electrolyte to the anode is catching up to the oxidation "discharge" rate. Technology such as thermal resistant sold ceramic electrolytes are going to be becoming commonplace in the near future.

Quick charging with no detrimental effects is becoming more commonplace as charging/battery technology is keeping up with each other. I'm amazed at not only the solar generators but stand alone battery and BMS advancements that are allowing charge rates that were unheard of just few short years ago.

I predict in just a few years we will be seeing 10C+ charge rates on 500+amp hour battery banks and under one hour full charge from full discharge.

Tesla at 4C is also water cooled

 

[OllieChristopher]

Tesla at 4C is also water cooled

Yes good point. Ceramic is the latest greatest tech for lithium. Unfortunately its weight prohibitive.