The Core Role of NTC Temperature Sensors in BMS

In the context of the rapid development of new energy vehicles and energy storage systems, the safety and stability of batteries have been pushed to unprecedented heights. As a central system to ensure the safe operation of batteries, BMS (Battery Management System) is constantly being endowed with stronger intelligent monitoring and management capabilities. In this process, NTC temperature sensors, as the most basic but crucial sensing component, is playing an irreplaceable role.



NTC Temperature Sensor: Key Link of BMS Thermal Management
The task of the BMS system is not only to manage voltage and current, but also to control battery temperature changes in real time, which is a prerequisite for preventing overheating, thermal runaway, and even battery thermal explosion.

NTC (Negative Temperature Coefficient) thermistor has become one of the most sensitive means of monitoring temperature because of its "resistance decreases with temperature increase". It reverses the current temperature by detecting changes in resistance values, and can respond to changes in the working temperature of batteries within milliseconds. It is the core sensor for precise temperature control and thermal fault warning.

How to Assist BMS to Achieve Comprehensive Temperature Monitoring
In a typical new energy vehicle battery pack, the NTC sensor is usually arranged in the middle of the battery cell, near the terminal of the battery module, or in an area where heat is concentrated. They transmit real-time temperature data to AFE (analog front-end acquisition chip), convert it into digital signals through ADC (analog-to-digital converter), and upload it to the main control MCU system for processing. The whole process realizes closed-loop monitoring, dynamic adjustment and abnormal warning of battery temperature, providing solid data support for the normal operation of BMS system.

AFE NTC: The Golden Partner of Accurate Collection and Data Decision-making
In the energy storage and power battery system, the AFE chip realizes efficient data integration of multiple NTC temperature sensors by integrating multi-channel sampling, analog switching (MUX), high-precision ADC and reference voltage modules. With the optimized arrangement of NTC probes, the following monitoring logic can be constructed:

Real-time temperature acquisition: multi-channel synchronous acquisition of the temperature of each area of the battery cell and module

Abnormal warning mechanism: overtemperature protection is triggered when the sensor exceeds the preset temperature threshold

SOC/SOH Assisted Judgment: Temperature as an Important Reference Signal for State Estimation

Linkage cooling system: temperature signal drives fan/liquid cooling system to intervene dynamically

This collaborative mechanism greatly improves the operating stability of the vehicle under extreme working conditions such as fast charging, high temperature, and high load.

Key points for selection: NTC temperature sensor is not a "universal part"

BMS's requirements for the selection of NTC sensors are much higher than those in ordinary consumer electronics scenarios. The following parameters need to be considered:

Selection Dimension Recommendation Parameter Recommendation
Temperature range-40 ℃ ~ 125 ℃/150 ℃ above high temperature type
Resistance accuracy ± 1% or higher
Response speed ≤ 5 s (typical value)
Package form wire type, epoxy package, glass seal probe, SMD patch, etc.
Humidity resistance and anti-corrosion meet vehicle grade/energy storage level protection grade

The Minsing NTC temperature sensor is developed based on automotive-grade process standards and has:
A full range of NTC chips are self-developed, with controllable accuracy and good curve consistency
Good stability under high temperature conditions, suitable for fast charging scenarios
Customized packaging and wire solutions to adapt to different module topologies
Rich application cases, has served many battery factories and supporting projects of Tier1 enterprises

Precise layout: sensors are not "more is better"
In addition to parametric performance, the layout position of NTC temperature sensors also determines the monitoring efficiency. The recommended principles are as follows:

As close as possible to the heat source of the battery cell (such as the middle of the tab/housing)
Avoid close to strong convection area (such as cooling fan outlet) to prevent misjudgment
The distribution of batteries should be balanced to ensure the representativeness of collection
Consider wiring harness finishing and EMC safety to reduce interference

Although the NTC temperature sensor is small in size and simple in structure, it plays an important role in the safety management system of new energy vehicles. With the increase in the energy density of the energy storage system and the intelligent upgrade of the vehicle, higher requirements are put forward for the NTC temperature sensor in terms of accuracy, reliability, and response speed.

Minsing will continue to provide customers with high-reliability, automotive-grade NTC sensor solutions with professional thermal material technology and packaging capabilities, helping the safe, intelligent and efficient operation of battery systems. For technical information, product specifications or customized design services, please visit website or contact the technical support team.