flangefrog
1 kW
I've been researching this for quite a long time. I intend to develop and produce these myself but I do want community input. The PCB will be designed so that most non-essential components are optional. Even essential components like the ADC can be swapped with different parts (e.g. 12 bit with internal reference). Several external devices like LED or display modules will be developed. The BMS will only support 16S/65V max (15S Li-ion cells) but it is possible I could add a connector for another 16S module. The open source PCB could also be modified to allow 32S. Uses the MAX14921 AFE. Configuration as shown with 16 bit MAX11163 and 4.5V MAX6194 should give approximately ±500uV accuracy. FETs can be arranged for separate or combined charge/discharge ports. Can communicate with charger or controller instead of having on board FETs. Many I/O lines 12 bit ADC and internal temp sensor available on the Rigado BMD-300 NRF52832 module. Also auxiliary inputs available on the MAX14921 that feed into the high accuracy ADC. Possible to add 16 way switch for lots more high accuracy ADC inputs (temp etc). NRF52832 supports Bluetooth LE, ANT+, nRF24L, nRF24AP protocols. NFC support so you can tap your phone to the battery and instantly see the charge status. Extremely low power consumption. Doesn't even need a regulator to power ADC, reference and BMD-300. NRF52832 can be programmed with Keil, IAR, GCC and even has an open source Arduino firmware available. My software will probably be in GCC.
Lots of features and specifications I haven't listed. I'm rather slow at developing my projects so don't expect this to be finished within a year. I'll be asking your opinions and advice on some of the component selection before I start with the schematic. Cost price for quantity of 100 will be at least $70 USD for the full featured base module. Edit: I'm thinking it may actually be quite a bit cheaper than that (without assembly).
Incomplete BOM: https://octopart.com/bom-lookup/Zd9nAmFM
Lots of features and specifications I haven't listed. I'm rather slow at developing my projects so don't expect this to be finished within a year. I'll be asking your opinions and advice on some of the component selection before I start with the schematic. Cost price for quantity of 100 will be at least $70 USD for the full featured base module. Edit: I'm thinking it may actually be quite a bit cheaper than that (without assembly).
Incomplete BOM: https://octopart.com/bom-lookup/Zd9nAmFM