BMx7318: a Battery Cell Controller for Electric Vehicles and Energy Storage Systems

NXP launched BMx7318, a lithium-ion battery cell controller IC. It is an analog front-end product made to monitor battery cells in electric cars and energy storage systems (ESS).  It can measure the voltage of 18 battery cells, track the flow of electricity, and monitor up to 12 other important voltages, making it a good solution for managing batteries. The BMx7318 also supports ISO 26262 ASIL C function safety target for automotive applications and SIL2 safety target for industrial applications.

Features of BMx7318

BMx7318 has various feature for managing batteries. Like, it can track the voltage of an 18-channel cell (18 battery cells) at the same time, measure the flow of electricity, and monitor up to 12-channel analog voltage measurement up to 150 mA supporting up to 125 °C ambient temperature. This helps keep an eye on things like temperature and insulation and pack voltage measurement. The AIN channels support pack voltage measurement, temperature measurement, and insulation measurement. The BMx7318 also has smart ways to average out voltage readings measurements through digital filtering, onboard balancing up to 300mA, ultra-low power mode consuming only 5 mA, a dedicated hardware alarm pin for rapid response to overcurrent events and integrated current measurement.

Target Applications

• Automotive
  • Electric vehicle high voltage battery management
  • Electric vehicle 48V battery management Main block diagram
• Industrial
  • Stationary ESS
  • Commercial ESS
  • Residential ESS
  • Micromobility
  • eBike/eScooter

Block Diagram

BMx7318 battery cell controller’s Architecture

The BMx7318 stands out because it can measure battery cell voltage very accurately, with a tiny margin of error of 0.8mV, which means it gives reliable readings that don’t change much over time. It’s also great at measuring voltage in certain systems, with an accuracy of 1mV for LPF voltage platforms, which is critical for applications where voltage stability is essential. Plus, the integrated circuit family design reduces the need for external components by 50% that helps save money.

The BMx7318 is a game-changer for battery management, offering high accuracy and reliability. It has a special feature, its integrated communication bridge (SPI2TPL) that lets devices talk to each other smoothly with isolated 2.0 Mbit/s. Also the product is built to last, supporting up to 25 years of use in ESS applications with an extended mission profile (EMP). Plus, it’s designed to work with other similar devices like BMI7318 through PIN2PIN, giving the system flexibility and room to grow.

Applications

The BMx7318 works with many different types of systems, like electric carsenergy storage and 48V applications. Additionally it has software features that help devices talk to each other, like  SPI communication with SPI2TPL bridge function and I2C controller for external devices . These features help designers create good battery management systems that meet modern needs.

Pricing for BMx7318 is not available at the moment. Products are not yet available on the online marketplaces. For more information, you can visit the product page, or check out the Datasheet for the same.

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