Connectivity for battery / charge management system
Posted: Wed Dec 22, 2021 12:19 am
I'm in the middle of developing a device to act as the charge controller and general central power management unit. I've had some trouble working out what input / output will actually be required, so I thought I'd make a post to tidy up my thought process, and potentially get input from others. My project is intended to be CAN centric, so I'm attempting to keep wiring light, but I don't want to miss anything.
Battery modules
* Slave modules have proprietary daisychain interface
Master BMS
* My own design - handles balancing and makes cell voltages available on CAN bus
* viewtopic.php?f=13&t=2123
Ovartech charger and DCDC converter
* Charge control via CAN
* DC-DC converter enabled by 12V interface - wire to ignition switch
* Battery lines fused direct to battery - no contactors
Current sensor
* Currently looking for a current sensor with coulomb counting and CAN
Charge controller - design in progress
* CAN interface - a single CAN bus to talk to BMS, charger, current sensor and gauge cluster
* EVSE PP and CP lines
* Low side switch to drive coolant pump during charging
* 12v digital input, either to enable charging or a charge stop button - I'd be interested to know how other people start / stop charging safely
Am I missing anything that will be needed to facilitate charge control or is otherwise essential to battery / charge management?
* Possibly a second low side switch for type 2 connector locking solenoid?
Battery modules
* Slave modules have proprietary daisychain interface
Master BMS
* My own design - handles balancing and makes cell voltages available on CAN bus
* viewtopic.php?f=13&t=2123
Ovartech charger and DCDC converter
* Charge control via CAN
* DC-DC converter enabled by 12V interface - wire to ignition switch
* Battery lines fused direct to battery - no contactors
Current sensor
* Currently looking for a current sensor with coulomb counting and CAN
Charge controller - design in progress
* CAN interface - a single CAN bus to talk to BMS, charger, current sensor and gauge cluster
* EVSE PP and CP lines
* Low side switch to drive coolant pump during charging
* 12v digital input, either to enable charging or a charge stop button - I'd be interested to know how other people start / stop charging safely
Am I missing anything that will be needed to facilitate charge control or is otherwise essential to battery / charge management?
* Possibly a second low side switch for type 2 connector locking solenoid?