IQcell Battery Management System
Description
The IQcell System is an advanced Battery Management System (BMS) comprised of a battery Pack Master controller and multiple cell mangement nodes. They function together to control the vehicle battery pack.
The individual cells in an unmonitored high voltage battery pack are susceptible to being taken outside their specified voltage range, leading to complete failure of the cell. The Tritium BMS eliminates this risk, by reliably monitoring each cell voltage and allowing the vehicle to gracefully reduce performance as any cell approaches the limits. The BMS can also completely disconnect the battery pack if any limit is exceeded, including for under voltage, over voltage, and over temperature.
Being a full Battery Management System, not just a monitoring system, the Tritium BMS nodes are also capable of limiting individual cell voltages during the charge cycle by shunting current around fully charged cells. This provides a top-of-charge balance for the battery pack, counteracting the differences in the cell's leakage currents due to age and manufacturing tolerances.
BMS Node
The Tritium BMS nodes suit any lithium cell chemistry of any form factor, as the threshold voltages are user-configurable and a simple wiring harness is used to connect the node to the cells.
Each node can monitor between one and eight cells, and is powered from the network, not the cells themselves, so the BMS itself does not contribute to cell leakage and imbalance.
| BMS node specifications | |
|---|---|
| Cell options | Any lithium cell |
| Communications | CAN bus (ribbon cable) |
| Balance current | 250mA (90mA version also available) |
| Voltage accuracy | 1mV |
| Update rate | Full pack @ 1Hz, MinV/MaxV @ 100Hz |
| Max system | 32 nodes, 256 cells |
| Battery wiring | Simple point-point ribbon, 1-8 cells |
| Fault detection | Redundant voltage sense, cross checked A/D reference, comms timeouts |
| Temp accuracy | 2°C |
| Isolation Rating | 950V DC |
| Dimensions | 135 x 55mm (250mA node) |
| Mass | 35g |
| Environmental | No enclosure — coated PCB |
Pack Master
The Pack Master bridges between the BMS nodes and the vehicle communications bus and controls the pre-charge and main contactors of the battery pack. It collates the telemetry data from the nodes and provides a summary of important parameters to other items on the vehicle CAN bus.
| Pack Master specifications | |
|---|---|
| Communications | CAN bus to both batteries and vehicle |
| Contactor Drive | 2x 12V 3A |
| Precharge | Resistive (includes fault detection) |
| Isolation Rating | 950V DC |
| Dimensions | 130 x 80 x 30mm |
| Mass | 150g |
| Environmental | IP4X — coated PCB |
Documentation
PDF documentation for the BMS is available below:
- Coming Soon!
Interested?
Please contact us for more information or to request a quote.