OverviewAll product unitsProduct unitPassive ComponentsProduct groupSignal & CommunicationsProduct familySignal TransformerProduct seriesWE-BMS Transformer for Battery Management Systems

WE-BMS Transformer for Battery Management Systems

Characteristics

  • Galvanic Isolation of 4300 VDC / 1 min.
  • Up to 1000 VDC working voltage
  • Integrated filter chokes for common mode suppression
  • Supports serial daisy chain isoSPI and SPI
  • AEC-Q200 qualification
  • Available in different footprints
  • Low profile versions
  • Operating temperature: -40°C up to +125°C

Applications

  • Energy Storage systems
  • Uninterrupted Power Supply (UPS)
  • E-bikes, E-scooters

Products

Order Code Data­sheet DownloadsPortsVT DC
(V (DC))
Working Voltage
(V (DC))
Cr
(mm)
L
(mm)
W
(mm)
H
(mm)
Samples
74941300SPEC
8 files 1 4300 1000 6 7.6 9.5 5.5
74941301SPEC
8 files 1 4300 1000 5 7.6 9.5 5.5
74941302SPEC
8 files 1 4300 1000 10 9.5 15.4 3.45
74942300SPEC
8 files 2 4300 1000 10 15.1 14.7 4.75
74942301SPEC
8 files 2 4300 1000 10 15.1 14.9 3.45
74942302SPEC
8 files 2 4300 1000 10 15.1 15.4 3.45
Order Code Data­sheet
74941300SPEC
74941301SPEC
74941302SPEC
74942300SPEC
74942301SPEC
74942302SPEC
Samples
Order Code Data­sheet DownloadsPortsVT DC
(V (DC))
Working Voltage
(V (DC))
Cr
(mm)
L
(mm)
W
(mm)
H
(mm)
Samples

Transformer for Battery Management Systems with integrated Common Mode Choke

The new WE-BMS series isolates the serial-connected components of the battery pack and the following BMS controllers from each other, suppressing any voltage differences and EMI that may occur. The design from Würth Elektronik provides a much larger physical creepage distance as opposed to other competitors, following market requirements for this kind of applications.

By maintaining the physical distance through the innovative design regardless of coated traces, high system safety and reliability can be achieved through special robustness against dryness or heat. Fully insulated wires are used for flat design and even better isolation properties.

What is a battery management system (BMS)?

What is a battery management system (BMS)?

A BMS is an electronic system that manages a rechargeable battery with the goal to make it safe and reliable.

Functions of a BMS:

  • Protecting the battery from operating outside its safe operation area
  • Monitoring its state of charge and state of health
  • Calculating secondary data and reporting that data
  • Controlling its environment
  • Authenticating it and/or balancing it
Why is a transformer needed in a BMS?

Why is a transformer needed in a BMS?

The individual cells in a battery pack are connected in series as well as the following BMS controllers. Between the components or PCBs connected in series, voltage differences and electromagnetic interference can occur. A transformer can be used to insolate the components from each other and suppress EMI interference. Therefore, WE-BMS transformer supports the BMS isolation and EMI noise suppression for a safe and reliable operation.