Battery Reset button what if ?

[leeman]

What if they could have a battery reset button to the mach E platform ? thoughts.

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[louibluey]

A battery reset button would be great!

Similar discussion here: https://www.macheforum.com/site/threads/dead-12v-battery-jump-starting.12312/#post-300726

 

[Jimrpa]

What is a 12 Volt Battery Reset?

 

[generaltso]

What is a 12 Volt Battery Reset?

In cars with a Lithium Ion 12V battery (like some Hyundais), it allows you to jump start a dead LVB with the HVB.

 

[hroj-mustang]

No good if you cant get in the car...

 

[Jimrpa]

In cars with a Lithium Ion 12V battery (like some Hyundais), it allows you to jump start a dead LVB with the HVB.

Ah, cool! That would be a VERY useful FordPass function!

 

[Jimrpa]

No good if you cant get in the car...

I thought about putting it on FordPass but then realized that wouldn’t work. It would have to be a hard switch and the switch would have to be accessible from outside the cabin or, you’d need to be able to enter the cabin some other way.
It has also dawned on me that the emergency frunk release electric cables are a security vulnerability. Anyone can use them to gain access to the frunk and it’s contents. Best not keep anything of value in there.

 

[generaltso]

It has also dawned on me that the emergency frunk release electric cables are a security vulnerability. Anyone can use them to gain access to the frunk and it’s contents. Best not keep anything of value in there.

Only when the 12V battery is dead.

 

[Jimrpa]

Only when the 12V battery is dead.

Oh? I wondered about that very scenario. So you’re saying that those frunk opening cables are only active if the 12V battery is dead? Has anyone tested and confirmed this?

 

[macchiaz-o]

Oh? I wondered about that very scenario. So you’re saying that those frunk opening cables are only active if the 12V battery is dead? Has anyone tested and confirmed this?

Yeah you'd have to search for it, but forum members have tested this and reported their findings.

 

[generaltso]

Oh? I wondered about that very scenario. So you’re saying that those frunk opening cables are only active if the 12V battery is dead? Has anyone tested and confirmed this?

Yes, it has been tested. Lots of talk about it in other threads.

 

[louibluey]

Ah, cool! That would be a VERY useful FordPass function!

Actually, it could work, a couple of ways. If a 12V partition of the HV battery (or, another 12V battery of any suitable chemistry in the HV battery enclosure) is used as @generaltso explained in the other thread, presumably 99% of the time, that partition or battery is okay. So if that partition powered the communications either directly, or automatically if a low LVB is detected, then Fordpass could still work.

Of course with that kind of automation, the partition (or back up battery) could also automatically supplement the LVB if LVB is not completely shorted. Lots of possible ways to boost or back up the LVB or the 12V bus.

The only constraint is that the HV battery contactor can never close without 12V (safety concern, 12V bus dead, no HV, never), which eliminates the possibility of initially somehow starting the DC/DC converter to charge the LVB.

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