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Vinci-EV BMS selection

Selection guides

Guides in designing a battery with a Vinci EV BMS.

⇪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

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			✔
Format	Pouch	✔	✔
1 temperature / cell				✔

⇪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 ▼