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Every product starts with intent. SPREAD reads your requirements, checks them against years of your engineering data and prior projects, and flags the conflicts and gaps a senior engineer would have caught, before they reach design.
Requirements Manager›E-Platform Gen3›BMS-HV Specification
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SPEC-BMS-HV-2026-003.pdf
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BMS High-Voltage Battery System Requirements Specification
Document ID: SPEC-BMS-HV-2026-003Revision: 2.1
Date: 2026-03-28Author: Dr. M. Weber
Department: EE ArchitectureStatus: Under Review
3 Electrical Requirements
3.1 General
The Battery Management System (BMS) shall provide comprehensive monitoring, control, and protection for the high-voltage battery system installed in E-Platform Gen3 vehicles. All electrical requirements defined in this section shall be validated against the reference architecture (PLT-EPG-003) and shall comply with applicable EMC standards per LV 124 and CISPR 25.
3.2.1 The BMS shall monitor individual cell voltages with an accuracy of ±5mV across the full operating temperature range (−40°C to +65°C). Measurement sampling rate shall be ≥10Hz during active vehicle states. Reference: ISO 18300.
3.2.2 Active cell balancing shall maintain voltage delta below 20mV across all series-connected cells during both charge and discharge cycles. The balancing algorithm shall achieve equalization within 4 hours under standard conditions as defined in test procedure TP-BMS-042.
3.3.1 The system shall disconnect the HV battery within 50ms upon detecting a critical isolation fault (resistance < 100Ω/V). This requirement is classified ASIL-C per ISO 26262-3.
3.3.2 All safety-relevant BMS functions shall comply with ISO 26262 ASIL-C requirements. Redundant monitoring paths shall be provided for all critical measurements including cell voltage, pack current, and isolation resistance.
3.4.1 Battery state of charge (SoC), state of health (SoH), and fault status shall be transmitted via CAN bus (FlexRay backup) with a maximum cycle time of 100ms during driving states.
3.5.1 The battery pack assembly shall maintain full operational capability within an ambient temperature range of −40°C to +65°C without degradation in performance or safety characteristics…
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