48V / 14S
Advanced Battery Management System
A high-reliability BMS solution developed for 48V – class battery packs with 14 cells in series, integrating precise cell monitoring, active system diagnostics, cell balancing, thermal monitoring, and battery state management into a single compact platform.
14S Cell MonitoringASIL D-Capable Cell MonitoringPassive Cell Balancing8× NTCFull-Duplex RS422Pressure MonitoringLeak Detection
Thermal Monitoring — Thermal conditions are monitored by collecting temperature data from eight independent NTC channels within the battery..
Safety-Focused Cell Monitoring
Real-Time Battery Safety Monitoring
The BMS GUI provides a clear and intuitive view of the battery system, bringing critical cell and system parameters together in a single interface.
Cell voltages, temperature measurements, balancing status, and diagnostic information can be monitored in real time, allowing abnormal conditions to be identified quickly and supporting informed system-level decisions.
By visualizing data from the MC33775A-based cell monitoring layer, the interface provides direct visibility into the battery’s operating condition and safety-related parameters.
Designed for fast diagnostics, continuous monitoring, and safety-oriented control, the GUI transforms complex battery data into clear and actionable information.
ASIL D-Supported Battery Cell Controller
- The MC33775A is a Battery Cell Controller (BCC) supporting 4–14 cells, offering high-precision differential cell voltage and temperature measurement, integrated passive cell balancing, and comprehensive diagnostic and functional safety features.
- Cell voltage measurement for up to 14 cells
- ASIL D support for cell voltage, module voltage, and temperature measurements
- High-precision cell measurement
- Integrated passive cell balancing with diagnostics
- SPI and isolated daisy-chain communication support
- CRC and fault/diagnostic infrastructure
Contribution to the Safety Architecture
The functional safety features of the MC33775A provide a strong hardware foundation for cell voltage and temperature monitoring, which are among the most critical measurement functions in the BMS. As a result, the battery control software receives data from an independent and diagnostic-capable cell monitoring layer.
This approach provides an architecture in which cell overvoltage, undervoltage, temperature limits, measurement inconsistencies, and other diagnostic conditions can be evaluated by the higher-level BMS control logic.
14-Cell Voltage Monitoring
The voltages of all 14 series-connected cells are monitored individually, enabling precise tracking of the battery’s condition.
Diagnostic Cell Balancing
An MC33775A-based passive balancing architecture enables effective management of voltage differences between cells.
8× NTC Temperature Monitoring
Thermal conditions are monitored by collecting temperature data from eight independent NTC channels within the battery.
Current & Pack Voltage
Battery current and total pack voltage are measured to provide data for system control and protection functions.
Pressure & Liquid Leak Monitoring
Dedicated inputs for battery internal pressure and liquid leak sensors help monitor mechanical and environmental conditions.
Full-Duplex RS422
A full-duplex RS422 interface is provided for reliable serial communication with the higher-level control unit.
Cell Count
14S series cell monitoring. The MC33775A supports 4–14 cells; this product uses a 14-cell configuration.
Cell Measurement Range
−5 V … +5 V input range (MC33775A). The specified accuracy range extends from 1.5–4.5 V/cell.
Pack Voltage Measurement
The MC33775A provides a 9.6–65 V input range for module voltage measurement, making it suitable for 14S / 48 V-class battery architectures.
Balancing Current
Approximately 97 mA @ 4.2 V nominal design current per cell. The cell balancing resistor network consists of three 130 Ω resistors in parallel, resulting in an equivalent resistance of approximately 43.3 Ω. The MC33775A provides balancing FET capability of up to 300 mA per channel.
Balancing Mode
Passive balancing. Excess energy from the cells is dissipated as heat through resistors. The MC33775A supports time-, voltage-, temperature-, and PWM-controlled balancing functions.
Balancing Safety
Voltage thresholds, timeouts, and temperature-based shutdown mechanisms can be used for the balancing function. The MC33775A balancing MOSFETs feature diagnostic capabilities.
Cell Monitoring
The voltages and temperatures of all 14 cells are monitored through the MC33775A, with diagnostic information transmitted to the MCU.
Cell Balancing
The cell balancing function helps maintain balanced cell voltages across the battery pack.
Power Management
Auxiliary power rails required by the BMS electronics are generated from the 48 V battery input.
Embedded Controller
The STM32F415-based MCU handles measurement data processing, system state management, and communication functions.
Environmental Monitoring
The battery pack’s environmental and physical conditions are monitored through NTC, internal pressure, and liquid leak sensors.
Service & Diagnostics
A JTAG/debug interface provides access for development, servicing, and production testing.
Uyumlu Hücre Aileleri
- Li-ion / NMC / NCA / LCO / LiPo gibi yaklaşık 4.2 V tam şarj sınıfındaki hücreler
- LiFePO₄ (LFP) gibi yaklaşık 3.65 V tam şarj sınıfındaki hücreler
- Gerilim eşikleri yazılım/configuration seviyesinde hücre kimyasına göre belirlenebilir.
- MC33775A’nın hücre ölçüm altyapısı Li-ion batarya uygulamaları için tasarlanmıştır.
14S Örnek Paket Gerilimleri
- 14S Li-ion/NMC: yaklaşık 58.8 V maksimum şarj sınıfı (4.20 V/cell)
- 14S LFP: yaklaşık 51.1 V maksimum şarj sınıfı (3.65 V/cell)
- 48 V nominal: hücre kimyasına ve nominal hücre gerilimine bağlıdır.
- Kesin UV/OV trip değerleri uygulama, hücre üreticisi ve güvenlik konseptine göre tanımlanmalıdır.
Teknik Özet
Safety-oriented battery intelligence.
The number of cells, communication interfaces, sensors, and protection functions can be customized to meet the specific requirements of your battery system.
© Skytronx Systems Bilişim A.Ş. • 48V / 14S Advanced Battery Management System