# Spread: Launch faster. Break nothing. Know why

> Source: <https://www.spread.ai>
> Published: 2026-10-21 08:25:53+00:00

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Requirements Specification

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.

| Parameter | CAN Signal | Cycle | Resolution | 
|---|---|---|---|
| Cell Voltage | BMS_CellV | 100ms | 1mV | 
| Pack Current | BMS_PackI | 50ms | 0.1A | 
| Temperature | BMS_Temp | 500ms | 0.5°C | 
| State of Charge | BMS_SoC | 100ms | 0.1% | 

**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…

**Cell Modules** BMS-CM-001

**91%**

**3 similar requirements** found across 2 past projects (MEB-2024, PPE-2025). Previous realization used passive balancing — this spec requires active.

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