Automotive battery protection & disconnection

Prevent damage and failures by detection and disconnection for safe parking, charging and discharging.

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Overview

Battery protection units (BPU) play a critical role in preventing thermal runaway and damage to batteries or charging devices. Fast and accurate disconnection of the battery from the charger in case of failure events such as overcharge, undercharge, over- and under-temperature, over-current, and reverse polarity safeguards the battery, enhances safety, and prevents potential hazards.

Benefits

  • CoolMOS™: Solid state disconnects
  • CoolSiC™: Solid state disconnects
  • EiceDRIVER™: High-voltage driver
  • PROFET™: Mechanical relay driver
  • HITFET™: Mechanical relay driver

Block diagram

About

Reliable disconnection when failure or damage detected

To prevent thermal runaway and damage of batteries or charging devices, our automotive battery protection units (BPU) offer:

  • Fast and accurate disconnection of the battery from the charger when triggered by failure events
  • Safe disconnection of the battery when the vehicle is off
  • Monitor the state of the disconnection
Battery protection use cases

There are several cases of failure that can be prevented with automotive battery protection units.

  • Overcharge & undercharge: When the battery is charged over or under its thresholds.
  • Over- & under-temperature: The rise in ambient temperature and high current rates during charging or discharging might cause the internal temperature of the cells to exceed their safe operating temperature range. The abused cells can generate toxic and flammable gases and become a self-sustaining thermal runaway event due to the heat, which could eventually lead to explosion.
  • Over-current: When the battery is exposed to a short circuit condition or a high inrush turn-on current due to collision or defective or aging components.
  • Reverse polarity: When the battery terminals are wrongly plugged into the device.
Cost-saving high-voltage switch solutions
  • ASIL-C compliance
  • Same constructed space as melting fuse, flexible system integration
  • Cost optimized system solution
  • Selective, arcing free switch-off in case of failure
Improve efficiency with high-voltage gate drivers

Well-suited for both silicon and wide-bandgap power devices: EiceDRIVER™

  • High efficiency
  • Wide range of typical output current
  • Robust gate drive protection features
High and low side smart switches
  • Support up to 24 V
  • PWM output up to 20 kHz for reducing relay driving noise
  • Integrated protection and diagnostics features
Best-in-class robustness with compact design and lowest PPM rates

Infineon's highly integrated products significantly decrease the footprint, and help the customers to reduce costs by minimizing printed circuit board size. Besides, Infineon's zero-defect Mindset is reflected in the lowest PPM rates in the market, and significantly reduces vehicle downtime and returns.

Reliable disconnection when failure or damage detected

To prevent thermal runaway and damage of batteries or charging devices, our automotive battery protection units (BPU) offer:

  • Fast and accurate disconnection of the battery from the charger when triggered by failure events
  • Safe disconnection of the battery when the vehicle is off
  • Monitor the state of the disconnection

Battery protection use cases

There are several cases of failure that can be prevented with automotive battery protection units.

  • Overcharge & undercharge: When the battery is charged over or under its thresholds.
  • Over- & under-temperature: The rise in ambient temperature and high current rates during charging or discharging might cause the internal temperature of the cells to exceed their safe operating temperature range. The abused cells can generate toxic and flammable gases and become a self-sustaining thermal runaway event due to the heat, which could eventually lead to explosion.
  • Over-current: When the battery is exposed to a short circuit condition or a high inrush turn-on current due to collision or defective or aging components.
  • Reverse polarity: When the battery terminals are wrongly plugged into the device.

Cost-saving high-voltage switch solutions
  • ASIL-C compliance
  • Same constructed space as melting fuse, flexible system integration
  • Cost optimized system solution
  • Selective, arcing free switch-off in case of failure

Improve efficiency with high-voltage gate drivers

Well-suited for both silicon and wide-bandgap power devices: EiceDRIVER™

  • High efficiency
  • Wide range of typical output current
  • Robust gate drive protection features

High and low side smart switches
  • Support up to 24 V
  • PWM output up to 20 kHz for reducing relay driving noise
  • Integrated protection and diagnostics features

Best-in-class robustness with compact design and lowest PPM rates

Infineon's highly integrated products significantly decrease the footprint, and help the customers to reduce costs by minimizing printed circuit board size. Besides, Infineon's zero-defect Mindset is reflected in the lowest PPM rates in the market, and significantly reduces vehicle downtime and returns.

Documents

Documents

Design resources

Partner solutions

Developer community

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