Feature: Electric Vehicles
Figure 2. Outline of a wired BMS
Flexibility, capability and cost-effectiveness Te ADBMS6815 family offers an ideal combination of features to address a broad range of requirements, complementing the safety, reliability and performance already outlined. Tese devices use the same package and pinout, allowing designers to combine the different channel counts (6, 8, 12 battery cells monitored with each device) to create a general design that can be populated to address a broader range of battery pack or cell module configurations. Tese parts also include general-purpose I/O that can operate as digital inputs, digital outputs or as analogue inputs. When operated as analogue inputs, they can measure any voltage up to 5V with the same measurement accuracy as the primary cell measurements. Furthermore, these auxiliary measurements, such as temperature or current, can be synchronised with individual cell measurements for more accurate SOC calculation. Tese I/O pins can also control I2C or SPI subnode devices, enabling
more complex functions, such as the addition of multiplexers for expanded analogue inputs or EEPROM to store calibration information. Finally, these parts include cell balancing capability whereby up to 300mA of current is discharged on any cell. Tis enables the system to equalise and maintain an equal SOC among all cells in the pack. Te equalising process can be set up for a specific period, and automatically stopped when pre-programmed thresholds are achieved. Tis allows balancing over a long period, even while the battery cell monitor is in sleep mode.
Common Features • ADBMS6815 (12-channel) • ADBMS6817 (8-channel) • ADBMS6816 (6-channel) • Supports automotive safety integrity level D • Maximum lifetime total measurement error: 1.5mV • Stackable architecture for high voltage battery packs
• 304μs to measure all cells in a system • 16-bit ADC with programmable noise filter • 300mA per channel passive cell balancing with programmable PWM control
• 2Mbps electrically isolated isoSPI communication • Uses only 2 wires and capacitors or transformer • Reversible communication supports ring-topology; allows for communication even with a fault along the communication path
• 7 general-purpose interface pins usable as analogue or digital inputs or digital outputs; supports temperature sensors and configurable as an I2C or SPI main • 5.5μA sleep mode supply current • 48-lead 7mm × 7mm LQFP package Within the next 30 years, the world will transition from ICE to
electric passenger vehicles. Te enormously inefficient use of gasoline, a product derived from a limited resource, will ensure that this happens. Geopolitical and environmental concerns will only accelerate the trend. Electric cars are the future and BMS technology is a key enabler. Leading-edge BMS products, such as the ADBMS6815 family,
are enabling the future. Tese ICs are certified ISO 26262 ASIL-D compliant, and they offer the industry’s highest battery cell voltage and temperature measurement accuracy. Te ADBMS6815 family follows many generations of road-proven battery monitor ICs, designed to surpass the environmental, reliability and safety demands of automotive and industrial applications. Tey continue to efficiently address the evolving and challenging requirements for EV fleets and large energy storage systems. Designers can select ADI, confident that our market leading technology delivers the best possible BMS today and establishes a path for leading-edge systems based on our ever- expanding innovations for tomorrow.
To learn more, contact ADI Battery Management Group and visit
analog.com/BMS.
www.electronicsworld.co.uk March 2025 15
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