Cherry67 said:
Geek said:
I don't think apple batteries have an internal BMS. However, you are going to have your work cut out soldering connectors for them. Probably the best way would be to custom design PCBs for them - both for capacity testing and the final build.
With respect, i doubt.
Life is a bitch.
I said the above because i am a
lithium addicted.
Or better, not because i am addicted, but by the result it has. I am disassembling each and every unit i can put my hands on, when it is LiIon powered, whether i repair or trash them is irrelevant. I am collecting them from whatever the source is.
I have had so many different batteries in hand, starting fom the ol' mobiles with their exchangeable batteries, my Ipod (gen 4), Tablets, Smartphones, Household wireless, Power blocks from tools.....whatever i saw had a BMS installed, even if it was so small you saw it only by opening the outer package layer.
(there is one exception, i come to it later). But, theres always reason accepting different opinions and doubts........ always time to learn something new.
Same happened on Thuesday, 3 days ago, i could lay my hands of a few batteries, quickly grabbed together from the trash bin of our garbage collector under the angry eyes of the worker. 2 laptop bats, and a few already dissassemled specimen from unknown source. Only today i had a few minutes to look at them anf found... the following:
Apple batts. Wasn't there a thread claiming theres no BMS in Apple's? (Ah, found it
)
Had not seen them before, i guess a quite new construction:
(Blue) the closing tape on top, where the connection between Stripes of the battery and stripes to the connector are hidden. Very narrow.
(Red) Since the plug is placed on the stripes, it must be a DOUBLE stripe... possiply a bad idea to cut that with pliers ?
Let us look if there is a BMS:
This is the two stripes coming out of the cell. These (usually) cannot be soldered.
And on the other side we see....
(blue) the spot welded connection between the stripes of the battery and that of the Connector Strip.
But - WAIT!
(Red) whats that! Its looking like..... pads on a printed board ?
Unfolding the unit along the lever of the Battery stripes we see :
A very small BMS, leass than 1/10 in wide. The connecting stripe to the connector finally shows as a very thing pronted material as well, so its on two stripes stacked as i thought first.
Unluckily, that it makes de-mounting of these but retaining a solderable point very difficult.
When i came here to write this, i saw that the cells i have seem to be quite similar to the ones the OP has... given the amount the OP seems to have, a very unlucky situation - but a funny coincidence!!
Ah - i have to reveal the exceptions where i have seen (pouch)cells with no BMS board (means the BMS function was integrated on the main board): Mostly in Power Banks, when quite big Pouch Cells are used, 8 Ah or something, and when the battery was no click-exchange.
As i said, life is a bitch.