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Vinci-EV BMS selection

Selection guides

Guides in designing a battery with a Vinci EV BMS.

back to top Topology comparison and recommendations

The differences between wired and distributed in the table above are independent of the BMS brand.

The table below shows differences related just to the way a Vinci BMS slave is connected.

Wired Distributed
VinciLink VinciBus
Block diagram Block diagram Block diagram
Description,
Slave to cells
For N cells, N+1 voltage tap wires go from the slave to the cells. Cells are divided into banks of up to 25 cells.
A cell board is mounted on each cell.
An adapter is connected to the most positive cell board, one to the most negative.
A 2-wire cable goes from the Slave to the positive adapter, one to the negative one.
Description,
Slave to Master
VinciLink
A Linear daisy chain (twisted pair) runs between the Master and the first VinciLink slave; one between each pair of adjacent VinciLink slaves.
VinciBus.
A parallel bus (5-wire) goes from the master, connects each module (slaves and application module), and ends in a terminator.
Pros
  • Simple 1-wire / cell sensing
  • Simple 2-wire twisted pair link
  • Isolated slaves: safe, high noise immunity
  • Few electronic assemblies
  • Very high resolution measurement
  • Simple 1-wire / cell sensing
  • CAN based: Reliable, high noise immunity
  • Redundant string for fail-safe operation
  • Ideal for split packs
  • Few electronic assemblies
  • Very high resolution measurement
  • Spaghetti-free cell sensing
  • Integral temperature sensing
  • CAN based: Reliable, high noise immunity
  • Redundant string for fail-safe operation
  • Ideal for split packs
Cons
  • High voltage wire through battery
  • Requires additional thermistors, few measurement points
  • May not be suitable for use between boxes in a split pack
  • High voltage wire through battery
  • Requires additional thermistors, few measurement points
  • Bus has more wires: 5
  • More electronic assemblies
  • Bus has more wires: 5
  • Lower resolution measurement
Recommendations
Case Sngl mid-size
Single large
Multiple
Voltage Low
Mid
High
Format Prismatic
Pouch
1 temperature / cell

 

back to top Cell sensing comparison

Wired Distributed
Description N+1 tap wires are connected to N cells. A cell board is mounted on each cell.
General
  • Simple to understand: one box, wires.
  • Few electronic assemblies
  • Lots of wires
  • Safer: no high voltage wires in battery
  • Few cables
  • Lots of electronics
Costs
  • Total initial BMS cost is similar
    • Cheaper electronics: fewer assemblies
    • More expensive wiring: lots of wires
    • Cost of thermistors, beyond just a couple, escalates rapidly
    • If there's a connector on the tap voltage wires, labor cost is high
  • Total repair cost is similar
    • Parts cost is higher: entire BMS is replaced
    • Labor cost is lower: BMS is easy to access
  • Total initial BMS cost is similar
    • More expensive electronics: more assemblies
    • Cheaper wiring: few cables
    • No additional cost for temperature measurement
    • If there's a connector on the cables, labor cost is low
  • Total repair cost is similar
    • Parts cost is lower: single cell board or module is replaced
    • Labor cost is higher: access to cell boards is harder
Measurement accuracy
  • Inherently more immune to AC noise: filters in slave
  • DC errors: current in tap wires, resistance of bus bars
  • Inherently more immune to DC errors: voltage is measured directly, at both cell terminals
  • Careful design required for AC noise immunity
Temperature measurement
  • Limited temperature information: few thermistors
  • Complete temperature information: one thermistor per cell
Volume, weight
  • Larger master
  • Space required for lots of wires
  • Practically no space required for voltage tap terminals
  • Smaller master
  • Little space required for few cables
  • Little space required for cell boards
Reliability
  • Reverse or peak cell voltage beyond a certain duration will damage entire slave
  • Open connection within a bank will damage entire slave (no damage if open is between banks)
  • Inherently ESD proof
  • If there's a connector on the tap voltage wires, lots of terminations may result in more failures
  • Cell voltage tap wires may be exposed to some mechanical stress during installation; vibration during use not an issue
  • Sealed slave is environmentally water-proof; connectors are not
  • Reverse or peak cell voltage, even of short duration, will damage only one cell board
  • Open connection within a bank will damage only one cell board (no damage if open is between banks)
  • Some ESD sensitivity
  • If there's a connector on the cables, few terminations may result in fewer failures
  • Cell boards may be exposed to some mechanical stress during installation, vibration during use
  • Sealed cell boards and slaves are environmentally water-proof; connectors are not

 

 

In this page:
Topologies
Cell sensing
 
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