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CT scans of batteries

scanofthemonth.com

41–50 of 76 posts

Re: CT scans of batteries

#41
post #15

> We used the measuring tools in our Voyager analysis software to decode the model number: it seems to mean that the battery is 21mm in diameter and 70mm tall. Or they could just read https://en.wikipedia.org/wiki/Battery_nomenclature , which describes the relevant IEC standard.

I'm pretty sure that sentence was supposed to be a joke. First of all, everybody knows this, secondly you really don't need a CT scanner to measure the diameter of a thing.

I didn’t know this.

Re: CT scans of batteries

#42

Very interesting! Confused by the text about the alkaline scan (the first one). The +ve side is called the anode isn’t it, not the cathode? And electrons originate at the cathode not the anode. Or is the usual terminology inverted because it’s a battery or this particular type of battery? I don’t know much about batteries; chemistry never a strong suit.

As I understand it, the cathode is where electrons "leave", the anode is where they "enter". In case of a battery, electrons leave the minus side. But for a device being powered, electrons enter the minus side.

Re: CT scans of batteries

#44

The LG lithium ion cell that's second on this page is the one inside the Tesla Model Y battery pack.

That's interesting and somewhat surprising. I'm not knowledgeable about battery design by any means, but I would have thought that there would be a better way to make a battery pack for a car than connecting thousands of small batteries together.

Re: CT scans of batteries

#45

Very interesting! Confused by the text about the alkaline scan (the first one). The +ve side is called the anode isn’t it, not the cathode? And electrons originate at the cathode not the anode. Or is the usual terminology inverted because it’s a battery or this particular type of battery? I don’t know much about batteries; chemistry never a strong suit.

Here's how I was taught to remember it: The cathode is purr-sitive.

Re: CT scans of batteries

#46

I have some LiFePO4 batteries powering my laptop, and onboard electronics on my boat. They are very heavy, but have a super long life. Often forgotten, they are used a lot in automotive applications!

LFP cells are what the Tesla Model 3 and Y RWD from GF Shanghai use.

They'd be ideal for home batteries you'd think - I wonder when they'll switch the Powerwall.

Re: CT scans of batteries

#48
post #44

The LG lithium ion cell that's second on this page is the one inside the Tesla Model Y battery pack.

That's interesting and somewhat surprising. I'm not knowledgeable about battery design by any means, but I would have thought that there would be a better way to make a battery pack for a car than connecting thousands of small batteries together.

It's often not the best design but the one that's cheap, scalable and has momentum behind it that wins out.

Re: CT scans of batteries

#49
How are they getting color? My impression is CT scan is mostly measuring density and x-ray absorption. Are they doing false color based on some sort of data (vs photoshop?)

Re: CT scans of batteries

#50
post #49

How are they getting color? My impression is CT scan is mostly measuring density and x-ray absorption. Are they doing false color based on some sort of data (vs photoshop?)

Looks like a basic CT scan but using the Plasma colormap from matplotlib (or a similar one).
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