Lawrence Rhodes via EV wrote:
Is it possible to use individual chargers and no BMS on discharge?
It's possible. It will work, as long as nothing goes wrong. The trouble
is, something *always* goes wrong, sooner or later. Why? Because we keep
using batteries until they fail.
If none of the individual chargers fail, then the cells will start out
fully charged. But when a charger fails, how will you know it?
On discharge, how will you know when the first cell goes dead?
Is using spring loaded battery boxes feasible? We are taking about a 48
to 72 volt 10 to 20 ah battery.
Spring loaded contacts are simply the cheapest way to do it. That's why
you see it on on every cheap toy and gizmo.
But think... how many times have to had to wiggle the cells in a
flashlight, or clean corrosion off the battery contacts of a gadget to
get it to work again? And these are on LOW current devices.
Do this with high current, and the problem gets worse. Do it at 48v or
more (where arcing becomes a problem), and you have a setup for dramatic
failures.
There's a good reason why virtually every higher reliability battery
pack WELDs the inter-cell jumpers.
--
I have no special talents. I am only passionately curious.
-- Albert Einstein
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
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