Brand New Model Y Battery Died

[sleepydoc]

Thanks for the info. On an HPWC2, what is the correct torque?

From the manual on Tesla’s web site:
“Use a torque driver and the included 4 mm hex bit to torque the terminal screws to 50 lbf . in (5.6 Nm)”

 

[sleepydoc]

Yes, there is also the problem that an under-torqued connection will have less than engineered contact area. The same thing happens if over-torqued with the additional possibility or arcing. If the latter, the best practice is to snip off the ends and start fresh.

Correct torque is really, really, really important.

and right on queue...

here's what happens when you don't torque properly.

Note - this was 100% my fault - I installed it with Polaris connectors that were rated for the proper current but they had a hex bolt. I only had an Allen wrench so I tightened as much as I could, planning on going back to check later on but forgot until this discussion. The connections had loosened, exactly as @SageBrush described, increasing the resistance and generating enough heat to cause the insulation to melt.

d

 

[laservet]

Are you guys talking about the big battery or the little one?

 

[Pianewman]

Are you guys talking about the big battery or the little one?

HAHAHA! The joke's on us. The OP never said "HV battery", but we all assumed that's what he meant.

...and...he hasn't returned...