Recent content by BlueSwordM

Here's something very nice for you all :) Source: International Battery Seminar | March 17-20, 2025 | Orlando, FL Man, this presentation will be golden: 2:20 Ultrafast Laser Processing of Battery Electrodes for Faster Charging and Improved Electrolyte and Electrode Wetting Ryan Tancin, Staff...

When dealing with very low voltage cells, your best bet is to get them up to normal voltage (3V) at extremely low currents. A lot of the very low voltage damage comes from bringing the cell up to normal voltage.

The lower the SOC, the better for battery lifetime (calendar life) and the better for safety. It's for 2 reasons: the amount of available electrochemical energy is lower, and the cathodes become much more stable. I believe I've shared a paper in this forum at some point, but at 0-5% SOC, the...

A complete short circuit decomposing or even igniting the electrolyte, is usually the biggest risk when it comes to lithium-ion cell destruction. In most cases, treating the cells decently will never result in such failures.

Wait a minute... What if we can use normal solder paste for copper spot welding?

On the topic of the 21700 LFP cell, I sent an email to Lishen to know about their distributors. Otherwise, I'll have to check if it's available on my Alibaba distributors. Worst case scenario, I ask one of my Chinese friends to get one of those cells for me :P

I know this is somewhat offtopic Padja, but it would be lovely if you could test this HE LFP 21700 cell: https://en.lishen.com.cn/Product_1/39.html Also this monstrosity of a high power cell that can charge at 10C: https://en.lishen.com.cn/Product_1/35.html

There are 3 reasons for this. 1- P45B cells were a decent bit more expensive than 50S cells for a while. 2- 50S(1) cells have a deserved reputation for being bad cells if you actually care about battery lifetime, unlike the 45B which is super tough and can achieve higher power levels than the...

BTW, this isn't exactly new, and I don't know where they got their cost estimates last time. I remember seeing this early last year, and their last press releases doesn't seem to have been updated since then. All of their claims are legitimate, but we still didn't get teat cells.

Conspirational thought: the Korean/Japanese battery manufacturers are starting to be scared by their Chinese counterparts, so they're preferring to work in secrecy.

To anyone reading, the quoted gravimetric energy density numbers are exclusively at the material level, not in a full cell. Still, 335mAh/g is extremely good, although this is likely at a much lower voltage than expected.

I wish I could afford your systems :( I remember finding these out a while back, but they're... expensive to say the least.

Oooh, I know understand why they sold the AM04 at the same price as the JP40: they wanted to make it seem as legitimate as the latter cell, which both increases their profit margin and their sales volume. Super scummy behavior.

Oof, 18650-21700.com and Austin will be absolutely cooked after this. Also, lmao for 160A/2s pulses. These are obscene pulse ratings if you don't attach big asterisks to them. The usual rule for pulsing is that with careful parameter, you can use calculated 2x max current pulses to perform some...

I didn't value talking about the P50S because it's mostly a refresh to try following the AI hype.