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SHL_Pod_SecondaryBMS

STM32 Nucleo-F746xx application with a library of supported commands for the Secondary BMS: Energus TinyBMS s516-150A

Connections / Wiring

STM32 Nucleo-F746ZG <----UART----> Energus TinyBMS s516-150A
or
STM32 Nucleo-F746ZG <-CAN-UART-> Energus TinyBMS s516-150A
<CC/CV Charger>

UART or CAN Configuration

UART
UART continuous communication in DMA (Direct Memory Access) mode
Baudrate: 115200 bit/s, 8 data bits, 1 stop bit, no parity, no flow control

CAN
bxCAN (Basic Extended Controller Area Network) peripheral driver for STM32
CAN2.0A (11-bit standard ID)
TinyBMS Default Node ID: 0x01 -> StdID_request: 0x201, StdID_response: 0x241
CAN bitrate: 500000bit/s

Battery Pack Configuration

Secondary Pack Characteristics
24V 50Ah (7S 20P) -- Specced for (t >= 2) hours runtime @ continuous load.
Nominal Capacity: 50Ah / 180Wh
Peak Discharge Current: 15C max (750A)
Average Discharge Current: 5C max (250A)

Individual Cell
Samsung INR18650-25R - Lithium Ion "18650" cylindrical cell - 2500mAh

Dimensions
Cell Height: 64.85 +/- 0.15mm
Cell Diameter: 18.33 +/- 0.07mm

Mass
Cell: 45.0g per cell
Module: 1.05kg per module
Pack: 7.35kg ~= 16.2lb

Electrical Ratings
I_cell_rating = 20A_ctns, I_pack_rating = 400A_ctns
V_cell_absmin = 2.5V, V_cell_nominal = 3.6V, V_cell_absmax = 4.2V
V_pack_absmin = 17.5V, V_pack_nominal = 25.2V, V_pack_absmax = 29.4V

Module Construction
Each 'super-cell' is a '10x2' (10 by 2) module which is comprised of 20 '18650' cells connected in parallel, but arranged in 2 rows of 10 cells.

Pack Configuration
The secondary battery pack is 7 of these 'super-cells' connected in series.

Charging Characteristics
Standard Charge (cell): CC/CV, 1.25A, 4.20 +/- 0.05V, 125mA cut-off -> 180min
Rapid Charge (cell): CC/CV, 4.00A, 4.20 +/- 0.05V, 100mA cut-off -> 60min (at 25°C)
Standard Charge (pack): CC/CV, 25.00A, 29.4 +/- 0.35V, 2.5A cut-off -> 180min
Rapid Charge (pack): CC/CV, 80.00A, 29.4 +/- 0.35V, 2.0A cut-off -> 60min (at 25°C)
Operating Temperature: 0 to 50°C

Discharging Characteristics
Nominal Discharge (cell): 0.2C (500mA), 2.5V cut-off
Max Continuous Discharge (cell): 8C (20A) (at 25°C), 60% at 250 cycles
Nominal Discharge (pack): 0.2C, 2.5V cut-off
Max Continuous Discharge (pack): 20A (at 25°C), 60% at 250 cycles
Operating Temperature: -20 to 75°C

BMS Settings Registers Configuration

Settings Register Value
Fully Charged Voltage: 4000mV
Fully Discharged Voltage: 3000mV
Early Balancing Threshold: 3200mV
Charge Finished Current: 1000mA
Battery Capacity: 5000mAh
Number of Series Cells: 7
Allowed Disbalance: 15mV
Pulses Per Unit: 1
Distance Unit Name: km
Over-Voltage Cutoff: 4200mV
Under-Voltage Cutoff: 2900mV
Discharge Over-Current Cutoff: 60A
Charge Over-Current Cutoff: 30A
Over-Temp Cutoff: 60°C
Low Temperature Charger Cutoff: 1°C
Charger Type: CAN
Load Switch Type: FET
Automatic Recovery: 5s
Charger Switch Type: Charge FET
Ignition: Disabled
Charger Detection: Internal
Speed Sensor Input: Disabled
Precharge Pin: Disabled
Precharge Duration: 100ms
Temperature Sensor Type: Dual 10K NTC
BMS Operation Mode: Dual Port
Single Port Switch Type: N/A
Broadcast Time: Disabled
Protocol: CAV3

System

Low Current Application (150A_peak discharging, 30A_peak charging)

  • Connected Devices
    • Energus TinyBMS s516-150A (?W)
    • Orion BMS Jr (?W)
    • Stepper Motors for Braking System (?W)
    • Bender ISOMETER IR155-3204 (?W)
    • STM32 Nucleo-F746ZG (?W)
    • Power Converters (?W)
    • Miscellaneous Sensors and Peripherals (?W)

Application Menu

1: UART Command Test
2: CAN Command Test
3: Monitor Charging (UART)
4: Monitor Discharging (UART)
5: Monitor Charging (CAN)
6: Monitor Discharging (CAN)
7: Quit

Supported Commands

  • UART Command Testing:

    • 1.1.1 TinyBMS_UART_ACK
    • 1.1.2 TinyBMS_UART_ReadRegBlock
    • 1.1.3 TinyBMS_UART_ReadRegIndividual
    • 1.1.4 TinyBMS_UART_WriteRegBlock
    • 1.1.5 TinyBMS_UART_WriteRegIndividual
    • 1.1.6 TinyBMS_UART_ReadRegBlockMODBUS
    • 1.1.7 TinyBMS_UART_WriteRegBlockMODBUS
    • 1.1.8 TinyBMS_UART_ResetClearEventsStatistics
    • 1.1.9 TinyBMS_UART_ReadNewestEvents
    • 1.1.10 TinyBMS_UART_ReadAllEvents
    • 1.1.11 TinyBMS_UART_ReadBatteryPackVoltage
    • 1.1.12 TinyBMS_UART_ReadBatteryPackCurrent
    • 1.1.13 TinyBMS_UART_ReadBatteryPackMaxCellVoltage
    • 1.1.14 TinyBMS_UART_ReadBatteryPackMinCellVoltage
    • 1.1.15 TinyBMS_UART_ReadOnlineStatus
    • 1.1.16 TinyBMS_UART_ReadLifetimeCounter
    • 1.1.17 TinyBMS_UART_ReadEstimatedSOCValue
    • 1.1.18 TinyBMS_UART_ReadDeviceTemperatures
    • 1.1.19 TinyBMS_UART_ReadBatteryPackCellVoltages
    • 1.1.20 TinyBMS_UART_ReadSettingsValues
    • 1.1.21 TinyBMS_UART_ReadVersion
    • 1.1.22 TinyBMS_UART_ReadVersionExtended
    • 1.1.23 TinyBMS_UART_ReadCalcSpeedDistanceLeftEstTimeLeft

  • CAN Command Testing:

    • 2.1.1 TinyBMS_CAN_ResetClearEventsStatistics
    • 2.1.2 TinyBMS_CAN_ReadRegBlock
    • 2.1.3 TinyBMS_CAN_WriteRegBlock
    • 2.1.4 TinyBMS_CAN_ReadNewestEvents
    • 2.1.5 TinyBMS_CAN_ReadAllEvents
    • 2.1.6 TinyBMS_CAN_ReadBatteryPackVoltage
    • 2.1.7 TinyBMS_CAN_ReadBatteryPackCurrent
    • 2.1.8 TinyBMS_CAN_ReadBatteryPackMaxCellVoltage
    • 2.1.9 TinyBMS_CAN_ReadBatteryPackMinCellVoltage
    • 2.1.10 TinyBMS_CAN_ReadOnlineStatus
    • 2.1.11 TinyBMS_CAN_ReadLifetimeCounter
    • 2.1.12 TinyBMS_CAN_ReadEstimatedSOCValue
    • 2.1.13 TinyBMS_CAN_ReadDeviceTemperatures
    • 2.1.14 TinyBMS_CAN_ReadBatteryPackCellVoltages
    • 2.1.15 TinyBMS_CAN_ReadSettingsValues
    • 2.1.16 TinyBMS_CAN_ReadVersion
    • 2.1.17 TinyBMS_CAN_ReadCalcSpeedDistanceLeftEstTimeLeft
    • 2.1.18 TinyBMS_CAN_ReadNodeID
    • 2.1.19 TinyBMS_CAN_WriteNodeID

Directory Contents

**SHL_Pod_SecondaryBMS**
|
└───Includes 
└───Core 
|   └───Inc 
|   |   | - it.h
|   |   | - main.h
|   |   | - stm32f7xx_hal_conf.h
|   |   | - TinyBMS.h
|   |
|   └───Src
|   |   | - it.c
|   |   | - main.c
|   |   | - msp.c
|   |   | - syscalls.c
|   |   | - sysmem.c
|   |   | - system_stm32f7xx.c
|   |   | - TinyBMS.c
|   |
|   └───Startup
|       | - startup_stm32f746zgtx.s
|
└───Drivers
|   └───CMSIS
|   |	└───Device
|   |	|   └───ST
|   |	|       └───STM32F7xx
|   |	|           └───Include
|   |	└───Include
|   └───STM32F7xx_HAL_Driver
|   	└───Inc
|   	└───Src
|
└───Debug 
└───Reference Docs
    └───ARM & STM32 Docs
    └───Screenshots
    └───Traces