shortened my cells - how to check if damaged?

[cmpct_cmpr]

4 x 280 Ah LiFePo4 cells in serial, see image.




When screwing down cables to the main positive pole (cell 4), I let the wrench slip and it shortened cell 4... It was about 1 second, sparks, then the wrench fell down.
Sh**!

How can I test if the cell(s) took damage? How probable is this?

Thank you for your help!

 

[Bob B]

If you didn't burn a spot on the terminal that might cause a connection problem .... and you didn't completely burn the end of the wrench off ... consider it a lesson learned.
Just continue testing the pack as normal.

 

[John Frum]

Did anything metal go from solid to plasma?

 

[cmpct_cmpr]

Did anything metal go from solid to plasma?

Luckily not

 

[Hedges]

Did anything metal go from solid to plasma?

Some people do that on purpose, for fun or in the name of science.

https://digital.library.unt.edu/ark:/67531/metadc885075/m2/1/high_res_d/888591.pdf

"Figure 13 shows the experimental set-up. 3 of the 4 NIF beams were used with a total of 6 kJ in 1.5 ns to drive a shock in a planar aluminum target. The drive beams were equipped with a CPP to produce the required flat-topped spot profile over 500 µm. 200 µm-scale holes of various geometries are implanted into the backside of the Al to promote corner jetting and subsequent break-out of a hydrodynamic Al jet into a foam reservoir. The relative alignment between drive beams and target was critical to produce symmetric jets; the measured rms shot-to-shot misalignment was 60 µm, better than the 100 µm requirement. In addition, shot-to-shot drive beam energy was repeatable to 4%, also better than the 7% requirement."

(Actually, they were studying hydrodyamics of propagating shock in aluminum. But the impulse to drive the shock was vaporization of aluminum on front side by laser.)

 

[fafrd]

4 x 280 Ah LiFePo4 cells in serial, see image.

View attachment 40761


When screwing down cables to the main positive pole (cell 4), I let the wrench slip and it shortened cell 4... It was about 1 second, sparks, then the wrench fell down.
Sh**!

How can I test if the cell(s) took damage? How probable is this?

Thank you for your help!

I checked the thread because I wanted to understand how you managed to shorten your cells. There is another guy that sat on his and managed to cause a fire, but your cells didn’t really get ‘shortened’ at all, did they? (Though it sounds like your experience was pretty exciting and hopefully educational .

Oh, and if it wasn’t clear, if you’re ever thinking of sitting on your cells, don’t.

 

[Deleted member 23531]

I watched a video a while back by "LithiumSolar" (a YouTuber), and he showed how he wrapped the handles of his wrenches with electrical tape to prevent this kind of stuff. Lesson learned; everyone should probably do that so only one end of the wrench is exposed if you drop it or bump the handle end into something.

 

[DerpsyDoodler]

I checked the thread because I wanted to understand how you managed to shorten your cells. There is another guy that sat on his and managed to cause a fire, but your cells didn’t really get ‘shortened’ at all, did they? (Though it sounds like your experience was pretty exciting and hopefully educational .

Oh, and if it wasn’t clear, if you’re ever thinking of sitting on your cells, don’t.

rain on my parade. This is what I wanted to do most, when I made my purchase.