Interfaces & Wiring
Safety Information
DO NOT CONNECT MODULE CELL INPUTS ACROSS MID-PACK SWITCHES, CONTACTORS OR SHUNTS
UNPLUG MODULE BATTERY CELL INTERFACES BEFORE BATTERY MAINTENANCE
VERIFY CELL VOLTAGES ON NEW INSTALLATIONS BEFORE CONNECTING TO MODULE
All pinouts are looking into the module, "through" the wire housing.
Isolation & Voltage Rating
The module is designed to provide a 1kV isolation barrier between the Battery Cell Interface J1 and the Power, CAN Interfaces J2/J3.
It is not recommended to connect GND to IGND, as this compromises the isolation barrier.
It is important to verify that other devices on the shared Power, CAN Interface are also isolated from the battery pack.
J1 - Battery Cell Interface
Wiring Considerations - Cell Taps
Correct wire selection is essential for mitigating the risk of cell tap shorts.
MPPE or PTFE insulated 24 to 20 AWG stranded wire is recommended. See Tools & Parts - Battery Cell Interface.
MPPE and PTFE provide good temperature and abrasion resistance.
Cell tap wires must be routed correctly to ensure they do not chafe or rub against any objects that could cause abrasion, and are not near hot surfaces or flammable materials.
It is recommended to keep cell tap wiring away from high current noisy conductors to minimise coupling and ensure good measurement accuracy.
Temperature Sensors
Free hanging, insulated lead, two wire 10K 1% B25/85 3435K NTCs are suitable, such as Vishay NTCLE and NTCA series.
Ensure the correct crimps are used for the specific NTC's wire gauge.
BMS106 Pinout
BMS108 Pinout
BMS110 Pinout
BMS112 Pinout
Signal Descriptions - Battery Cell Interface
| Pin Name | Description | Notes |
|---|---|---|
CELL0 ... CELL12 | Battery Cell Taps | CELL0 is reference potential |
NC | No Connect | DO NOT CONNECT |
RSVD | Reserved | DO NOT CONNECT |
VTEMP1 ... VTEMP2 | NTC Inputs | |
IGND | NTC References |
Tools & Parts - Battery Cell Interface
| Tool/Part | Manufacturer | Manufacturer Part Number |
|---|---|---|
Header | Wurth Elektronik | 66201821022 |
Receptacle | Wurth Elektronik | 662018113322 |
Wire Crimps (24 to 20 AWG) | Wurth Elektronik | 66200113722DEC |
Wire Crimps (30 to 26 AWG) | Wurth Elektronik | 66200413722DEC |
Wire Crimp Tool | Wurth Elektronik | 600001 |
Wire Crimp Die | Wurth Elektronik | 600300300001 |
Wire (or equivalent) | Alpha Wire | 6713 OR |
J2, J3 - Power, CAN Interface
Power, CAN Interface pinouts are the same between all variants.
Wiring Considerations - Power, CAN Interface
External devices connected to the module's Power, CAN Interface must share a common ground with the module.
Shielded, 4-wire, dual twisted pair, 20 to 24 AWG cable with 120 Ohm characteristic impedance is recommended. See Tools & Parts - Power, CAN Interface.
Shield termination and pass-through are available on the module, it is recommended to only terminate the shield to ground at a single point to avoid ground loops.
Due to the module's connector types an unshielded and untwisted section of the harness is inevitable. It is recommended to keep this section as short as possible.
Unshielded harnesses may work in certain low noise, short run installations, it is the integrator's responsibility to verify performance and integrity of the final wiring configuration.
Signal Descriptions - Power, CAN Interface
| Pin Name | Description | Notes |
|---|---|---|
PWR | Module Power (IN/OUT) | 6 - 36VDC |
GND | Module Reference | Voltage bus return |
CANH | CAN High | |
CANL | CAN Low | |
CANL_T | CAN 120R Termination | Connect to CAN Low |
SH | Shield Pass-through | Connected between J2/J3 |
SHGND | Shield Termination | Internally connected to GND |
Tools & Parts - Power, CAN Interface
| Tool/Part | Manufacturer | Manufacturer Part Number |
|---|---|---|
Header | Wurth Elektronik | 66200621022 |
Receptacle | Wurth Elektronik | 662006113322 |
Wire Crimps | Wurth Elektronik | 66200113722DEC |
Wire Crimp Tool | Wurth Elektronik | 600001 |
Wire Crimp Die | Wurth Elektronik | 600300300001 |
Cable (or equivalent) | LAPP | 2170343 |
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