Other Parts Discussed in Thread: BQ25713, EV2400, BQSTUDIO, BQ28Z610
Hi, :)
I am a student at Hochschule München (Applied Sciences) and involved in a project on the Car2X topic.
For this we have three 1:10 scale model vehicles in operation.
The next step for our team is the integration of a battery management and charging system for LiPo batteries.
The target battery configuration is 2S 2P. (4 cells of 3.7V 25C 4200mAh / only 2s is also an option but less suitable.)
We want to do this as efficiently as possible.
After a lot of research we came to the conclusion that a combination of the BQ28Z610-R1 and BQ25713 could be a nice and powerful combination for us.
(We know that we will need bqstudio + EV2400)
1. draft:
(The motor is controlled over a h-bridge)
further Conditions:
- Each cell should be balanced
- The capacity/charge status + voltages should be monitored and readable over I2C.
- Overcharge / current protection
- Deep charge protection
- Low self-consumption when switched off
- little space requirement (high integration density)
- (motor needs ~14A , 5V+3,3V ~5A load)
nice to haves/ questions: - It would be nice, if we could use a integrated processing unit to control two additional FET's, for switching the motor and the µC(Raspberry+Arduino..) Supply, without adding a µC for this purpose.
- Is the BQBMP processor capable to do that for us? (or a charger?)
- is it possible to program some additional lines of code to switch off the motor at a battery level <=10% an the other loads(µC) at a battery level <=5%
- +sending a warning according to these two capacity-levels (over I2C)
- Is it possible to use two BQ28Z610-R1 gas gauges together?
- to change their addresses(if needed)
- that they can communicate the correct current and voltage... values to the charger
- can they add up the values?
- or is the charger capable to do so?
- how would it be possible to balance and protect all cells and measure their capacity, when it comes to parallelization?
- Is the point in the draft, which is marked as "critical" the position where the load should be placed?
- Is their an other solution we should prefer?
Its a pity, that it seams like we're just getting a good 2s configuration this way.
I would be happy if you could give us some answers or advice's here.
Sincerely yours
Daniel Kerz
