Mr. Sharkey via EV wrote:
> Use parts and methods with a *proven*
> reliability record; not whatever is cheap and handy.
Cheap And Handy is my alternate identity in the workshop!! ;)
I resemble that remark! Cheap and Handy are my two "helpers" in the
shop. ;-)
But there are things I'll
Jan Steinman via EV wrote:
The fashionable way to balance is by switching a resistor (or some
equivalent) across the cells if they get high while charging.
Seems like a job for power MOSFETs, no?
Then, you'd have a voltage-variable resistor that could handle the boundary
conditions you
Tesla is facing another lawsuit over autopilot. Newsweek reports that a
Japanese family are suing Tesla for a accident 2 years ago in which a 44
year old pedestrian was struck and killed.
https://www.newsweek.com/tesla-lawsuit-model-x-autopilot-fatal-crash-japan-
yoshihiro-umeda-1501114
> From: Lee Hart
>
> The fashionable way to balance is by switching a resistor (or some
> equivalent) across the cells if they get high while charging.
Seems like a job for power MOSFETs, no?
Then, you'd have a voltage-variable resistor that could handle the boundary
conditions you cited.
> Use parts and methods with a *proven*
> reliability record; not whatever is cheap and handy.
Cheap And Handy is my alternate identity in the workshop!! ;)
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As a non-engineer I don't have much to contribute to this discussion.
However, I might point out that from what I've read you're talking about
designing a BMS for EVhobbyists, not for production EVs. IMO, that calls
for a somewhat less stringent level of fault tolerance.
Safety is still
Lawrence Winiarski via EV wrote:
Suppose you run a single wire out to 150 different batteries and you
have a good system. Suppose ONE of those 300 different connections
goes bad... Wouldn't it be nice to be able to have an alternate method of
communication... that didn't cost anything extra
Peter C. Thompson via EV wrote:
In a bus system (USB, CANbus, etc.) any failed
device takes out the entire system.
Actually not correct. CAN BUS works if a unit fails - UNLESS that unit
is blasting data on the bus.
But, that is one of the failure modes. It could also fail by shorting
the
On 4/29/20 6:46 PM, Lee Hart via EV wrote:
Peri Hartman via EV wrote:
- Is it a safety system, there to prevent damage and fires?
(battery SAFETY system)
Doesn't matter. It can still be handled by a poll from a master.
For this to work, both the master and all the slaves have to be
