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As electric vehicles (EVs) continue to evolve, battery safety has become a defining factor in both performance and consumer trust. With high voltages, fast charging, and demanding thermal environments, temperature monitoring inside EV battery packs is no longer optional — it's mission-critical.

Thermistors inside the battery pack. NTC thermistors are embedded at multiple points inside the battery module. Their role is to:

• Detect localized heating at the cell level.
• Provide real-time thermal feedback to the Battery Management System (BMS).
• Trigger cooling, derating, or system shutdown when overheating is detected.

This continuous temperature monitoring helps maintain the battery within its safe operating range (typically 20–60°C), which is essential for cycle life, charging efficiency, and safety.

Why thermistor performance matters? Unlike general-purpose sensors, EV-grade thermistors must meet rigorous requirements:

• Fast response to sudden heat rise (low thermal time constant).
• Tight tolerance (±1% or better) for accurate feedback to BMS.
• AEC-Q200 compliance for automotive reliability.
• Custom packaging for integration into prismatic, pouch, or cylindrical cell formats.

Failure to Sense = Failure to Protect. When thermal sensors are absent or underperforming, battery packs become vulnerable to thermal imbalance — where one overheating cell can cascade into others, leading to swelling, fire, or explosion. This is exactly why OEMs and Tier 1 suppliers now require component-level AEC-Q200 certification and proven production traceability.

In EV battery systems, thermistors are not optional extras — they are the eyes of the BMS. Without accurate, fast, and reliable thermal sensing, even the best-engineered battery packs risk failure.

At Shiheng Electronics, we provide automotive-grade NTC thermistors with customization, fast delivery, and 20+ years of manufacturing expertise. If you’re building EVs, we’re ready to help you build them safer.

Request a sample or contact our technical team to get started.