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doc: add purpose and limitation

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King Kévin 2023-06-11 19:20:30 +02:00
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12
CHANGELOG.md
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v0
==
this is mainly a board used as connector to the battery.
it provides:
- holes for wires to access the battery
- a DC barrel for charging (5.0 OD, 2.0 ID)
- a 3-pin header for the CAN port
- a 3-pin switch to turn power on/off (floating the Vsense wire)
- an LED to show when a charger is connected
- an LED to show when the battery is on

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README.md
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these are the hardware design files for the RPH0002 battery connector.
the RPH0002 is a battery back manufacturer by Jinyun Reypu Electronic Technology and used in [OKAI ES400B](https://eu.okai.co/pages/es400b) escooter.
the RPH0002 is a battery pack manufactured by Jinyun Reypu Electronic Technology and used in [OKAI ES400B](https://eu.okai.co/pages/es400b) escooter.
purpose
=======
@ -25,29 +25,35 @@ when charging, the % should blink, and the charging level displayed.
when the switch is toggled to off, the battery light turns red.
this clear after 10 minutes.
while the battery is turned on, the touch button of the battery does not show the level on the display anymore.
limitation
==========
the output current is limited to 1 A.
over that, the Battery Management System (BMS) with turn off the output after 5 seconds.
the output will be turned back on after 1 minute.
to fully activate the battery, you need to send specific CAN messages.
I header to the CAN port is available on the board.
mode of operation
=================
the 14 slots on the or for tab plugs, up to 1.5 mm thick, 6.5 mm wide, and 15 mm high.
the 14 slots on the bottom of the battery are for tab plugs, up to 1.5 mm thick, 6.5 mm wide, and 15 mm high.
these are pretty unusual though.
in a pinch, US plug lugs fit pretty well.
the closest PCB tabs I found are 0.8 mm thick (very usual), 6.35 mm wide (common), and 11.97 mm high (quite high).
the signal of the tab is written next to it on the back.
each signal appears twice because the connector is reversible.
this prevents any issue when the battery is mount the other way around in the escooter, even if the is one way to lock it in.
this prevents any issue when the battery is mounted the other way around in the escooter, even if there is only one way to lock it in.
it also allows to have redundant connections, and increases the contact surface, allowing for letting more current to run through.
the two signals are interconnected in the battery, and is this connector.
for the battery to fully turn on, the output needs to the constantly connected to the sense signal.
for the battery to turn on, the output needs to the constantly connected to the sense signal.
this is what the switch does.
to turn off, just leave the sense signal floating.
to turn it off, just leave the sense signal floating.
when the sense signal is connected to ground, the output will reset periodically and the battery light will blink red.
the battery also has a CAN interface.
it will ACK any input message.
it will output messages when charging, but their format is unknown yet.
I do not know if it requires any initial message for the battery to run on, but it does not need any message periodically to remain on.