\"4 Die in Fire Caused by Batteries in E-Bike Shop Near Chinatown\"...

[Ricky]

On Thursday, June 22, 2023 at 2:03:54 PM UTC-4, ke...@kjwdesigns.com wrote:

On Thursday, 22 June 2023 at 07:06:39 UTC-7, John Larkin wrote:
...

It occurs to me that even gigantic lithium batteries are made from a
lot of small cells. One cell shorting will ignite the entire pack. So
the bigger the battery (Tesla semi?) the higher the probability of a
fire and, of course, the bigger the fire.
...

Most manufacturers other than Tesla use larger format cells than 18650/2170 etc.

Even those larger cells have features that allow individual regions within the cell to become isolated in the event of a dendrite causing the two electrodes to be connected - usually the dendrite itself will self-destruct and be self-healing in a similar way to film capacitors subjected to overvoltage. There is just slight loss of capacity.

Again, each cell is within a steel enclosure that serves to contain the majority of thermal events. Accurate battery management and good quality control in manufacture minimize the chances of the thermal event in the first place.

Why are people talking about dendrite growth in EVs? That is a problem in lithium batteries. EVs don\'t use lithium batteries. They use lithium-ion batteries, which have virtually no problem with dendrite growth.

--

Rick C.

+ Get 1,000 miles of free Supercharging
+ Tesla referral code - https://ts.la/richard11209

 

[Anthony William Sloman]

On Tuesday, September 5, 2023 at 4:16:18 PM UTC+10, Ricky wrote:

On Thursday, June 22, 2023 at 2:03:54 PM UTC-4, ke...@kjwdesigns.com wrote:
On Thursday, 22 June 2023 at 07:06:39 UTC-7, John Larkin wrote:
...

It occurs to me that even gigantic lithium batteries are made from a
lot of small cells. One cell shorting will ignite the entire pack. So
the bigger the battery (Tesla semi?) the higher the probability of a
fire and, of course, the bigger the fire.
...

Most manufacturers other than Tesla use larger format cells than 18650/2170 etc.

Even those larger cells have features that allow individual regions within the cell to become isolated in the event of a dendrite causing the two electrodes to be connected - usually the dendrite itself will self-destruct and be self-healing in a similar way to film capacitors subjected to overvoltage. There is just slight loss of capacity.

Again, each cell is within a steel enclosure that serves to contain the majority of thermal events. Accurate battery management and good quality control in manufacture minimize the chances of the thermal event in the first place.

Why are people talking about dendrite growth in EVs? That is a problem in lithium batteries. EVs don\'t use lithium batteries. They use lithium-ion batteries, which have virtually no problem with dendrite growth.

\"Dendrite growth\" is a nice technical-sounding phrase. Batteries age as they accumulate charge/discharge cycles. How they age doesn\'t matter all that much - you need battery condition monitoring to keep track of the accumulated damage so that you can dump the batteries before they become actively dangerous.

Clowns like Flyguy think that they are always potentially dangerous, which saves him from actually having to think about what is going on - not something he can actually manage.

--
Bill Sloman, Sydney

 

[gggg gggg]

On Tuesday, June 20, 2023 at 3:51:58 PM UTC-7, Don Y wrote:

I guess that gives me second thoughts about replacing the lead-acid
batteries in my wheelchair with lithium given the size required...

(Not going to store a $40K chair outside \"just to be safe\"!)

From Chinatown to China:

https://www.youtube.com/watch?v=zS6dwGFv5HI&t=23s