Current Sensor: Measurement Range ±500A, Bandwidth DC to 100kHz

Q: What types of current sensors are used in automotive BMS?

Three main types: Hall-effect sensors (contactless, good isolation), shunt resistor sensors (cost-effective, high accuracy), and fluxgate sensors (highest precision for demanding applications).

Q: Why is current measurement critical in battery management systems?

Accurate current measurement enables precise state-of-charge calculation, detects overcurrent conditions, monitors battery health, optimizes charging efficiency, and ensures safety compliance with automotive standards.

Q: What automotive standards apply to current sensors?

ISO 26262 for functional safety, ISO 16750 for environmental testing, AEC-Q100 for reliability, and SAE J1939 for communication protocols in commercial vehicles.

Component Specifications

Definition

A precision electronic component designed to measure and monitor the flow of electrical current within an automotive battery management system (BMS). It provides real-time data on charging/discharging currents, enabling accurate state-of-charge calculations, thermal management, and safety protection functions. These sensors typically operate through Hall-effect, shunt resistor, or fluxgate technologies to achieve high accuracy and isolation.

Working Principle

Current sensors in automotive BMS typically use Hall-effect technology where a magnetic field proportional to the current flow is detected by a Hall-effect sensor, generating a voltage output. Alternatively, shunt resistor sensors measure voltage drop across a precision resistor, while fluxgate sensors use magnetic saturation principles for high-precision measurements. The sensor converts current magnitude into proportional electrical signals processed by the BMS microcontroller.

Materials

Hall-effect sensors: Semiconductor silicon or gallium arsenide chips, ferromagnetic cores, copper conductors, epoxy encapsulation. Shunt sensors: Manganin or constantan alloy resistors, copper terminals, ceramic substrates. Housing: Thermoplastic (PBT, PPS) or aluminum for thermal management, with IP67-rated sealing materials.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Accuracy	±0.5%
Bandwidth	DC to 100kHz
Power Supply	5V or 12V DC
Output Signal	Analog (0-5V) or Digital (CAN, SENT)
Response Time	<5μs
Isolation Voltage	2500V RMS
Measurement Range	±500A
Operating Temperature	-40°C to +125°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 26262, ISO 16750, AEC-Q100, IEC 61800, SAE J1939

Parent Products

This component is used in the following industrial products

Automotive Battery Management System

The Automotive Battery Management System (BMS) is an electronic control unit (ECU) designed for electric and hybrid vehicles.

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Smart Monitoring Module

An electronic monitoring component for smart home circuit breaker panels that tracks electrical parameters and system status.

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Protection Circuits

Electronic circuits that monitor and protect power electronics systems from overvoltage, overcurrent, overheating, and other fault conditions.

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Engineering Analysis

Risks & Mitigation

Magnetic interference from nearby components
Thermal drift affecting accuracy
Mechanical stress on connections
Moisture ingress in harsh environments
Electromagnetic compatibility issues

FMEA Triads

Trigger: Saturation from excessive current
Failure: Measurement inaccuracy or sensor damage
Mitigation: Implement current limiting circuits and overcurrent protection algorithms

Trigger: Temperature variations
Failure: Measurement drift and calibration loss
Mitigation: Use temperature compensation algorithms and select materials with low thermal coefficients

Trigger: Vibration in vehicle operation
Failure: Mechanical connection failure or internal component damage
Mitigation: Design with automotive-grade connectors and perform vibration testing per ISO 16750

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.5% full-scale accuracy maintained across -40°C to +125°C operating range

Test Method

Calibration against NIST-traceable standards, environmental testing per ISO 16750, EMC testing per CISPR 25, functional safety assessment per ISO 26262

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Current Sensor

11 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Acrel Co., Ltd.

Shanghai, CN

CE IEC VDE

Also makes: Remote Terminal Unit, Current Transformer, Active Power Filter and 6 more