beatle
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It sure looks like nice testing by an independent lab, but I'll hold onto my checkbook for now.
They shove a lot of energy into that battery very quickly without it blowing up, using only a couple of heatsinks for cooling. What's more, they slammed it at 11C for the full length of its charge cycle. Some of the latest Chinese LFP EV batteries can briefly take 10C, but then start to taper off as they approach 50% SoC or less - and that's using liquid cooling.
Some important stuff that's still missing: how many times can you do that before the cell degrades or destroys itself? They mention that typical battery chemistries are quickly killed by high C-rate charging, but they mention nothing about how long their own battery will last. This only shows that it survives the test.
The test also talsk about thermal stability. VTT actually stops the first 11C test because it topped 90C:
The first attempt was interrupted when the surface temperature reached the safety limit of 90 °C.
But Donut says this is "still very much in the comfort zone of this cell."
And what about low temperature performance? The presenter also admits the "sweet spot of the donut battery cell is in the more hot environment."
They shove a lot of energy into that battery very quickly without it blowing up, using only a couple of heatsinks for cooling. What's more, they slammed it at 11C for the full length of its charge cycle. Some of the latest Chinese LFP EV batteries can briefly take 10C, but then start to taper off as they approach 50% SoC or less - and that's using liquid cooling.
Some important stuff that's still missing: how many times can you do that before the cell degrades or destroys itself? They mention that typical battery chemistries are quickly killed by high C-rate charging, but they mention nothing about how long their own battery will last. This only shows that it survives the test.
The test also talsk about thermal stability. VTT actually stops the first 11C test because it topped 90C:
The first attempt was interrupted when the surface temperature reached the safety limit of 90 °C.
But Donut says this is "still very much in the comfort zone of this cell."
And what about low temperature performance? The presenter also admits the "sweet spot of the donut battery cell is in the more hot environment."
