Battery Management System (BMS): The Heart of Every EV

Powering Safe, Reliable, and Efficient Electric Mobility

In every electric vehicle (EV), the Battery Management System (BMS) plays a critical role in ensuring safety, performance, and longevity of the battery pack. Acting as the “brain” of the battery, the BMS continuously monitors, protects, and optimises battery operation under varying conditions.

As part of our E-Mobility Solutions, this week we focus on the Battery Management System block within the EV architecture, highlighting how key components come together to support reliable EV performance.

Application

Battery Management System (BMS) in Electric Vehicles

The BMS is responsible for:

• Monitoring cell voltage, current, and temperature

• Balancing battery cells for consistent performance

• Protecting against overcharge, over-discharge, and thermal runaway

• Supporting energy efficiency and battery lifespan

This makes the BMS a mission-critical subsystem in EV platforms, from passenger vehicles to commercial and industrial electric mobility solutions.

Engineering Background

BMS environments demand components that can withstand:

• High current and power density

• Thermal stress and temperature fluctuations

• Vibration and mechanical shock

• Long operational lifecycles with minimal maintenance

Component selection within the BMS directly impacts system reliability, safety compliance, and overall vehicle performance.

The Challenge

Designing a robust BMS requires addressing several engineering challenges:

• Ensuring stable, low-resistance electrical connections

• Managing heat in compact, high-power designs

• Maintaining signal integrity in harsh operating environments

• Achieving long-term reliability under continuous cycling

iConnexion Solution

Through our technology partners, we support BMS design with proven, automotive-ready solutions:

🔹 Harwin Asia– Press-Fit Terminals (MMi)
Provide reliable, vibration-resistant electrical connections without soldering, ideal for high-reliability BMS assemblies.

🔹 CAP-XX – Cylindrical Supercapacitors
Deliver high power density and stability, supporting peak power demands and energy buffering within the BMS.

🔹 SGC Circuits – Heavy Copper / Rigid-Flex PCBs
Enable excellent thermal performance and mechanical reliability, even in harsh EV operating environments.

Together, these solutions help engineers build safer, more efficient, and more durable Battery Management Systems.

Summary

The Battery Management System is truly the heart of every EV — protecting the battery, maximising performance, and ensuring long-term reliability. By combining high-quality interconnects, advanced energy storage components, and robust PCB technologies, iConnexion supports EV designers in developing next-generation BMS solutions.

 

Electric Vehicle Power Module

High-reliability socket solutions for thermally demanding EV applications

Electric vehicle (EV) power modules require interconnect solutions that can operate reliably under high temperatures while maintaining compact PCB layouts and consistent electrical performance. Harwin’s IMS-compatible socket solutions are engineered to meet these challenges, making them suitable for modern EV and automotive electronic systems.

Application

Harwin IMS socket solutions are commonly used in:

• Electric vehicle power modules

• IMS (Insulated Metal Substrate) PCBs

• Automotive control systems

• Automotive and street lighting applications

Engineering Background

IMS PCBs feature a copper circuit layer bonded to a thermally conductive dielectric and a metal baseplate (aluminium or copper). As the layers are electrically isolated and do not use plated through-holes, conventional through-board sockets are unsuitable for these applications.

The Challenge

EV designers require a connector solution that:

• Supports effective thermal management

• Sits above the PCB using a stand-off design

• Allows surface-mount termination

• Ensures accurate multi-pin alignment

• Supports Design for Manufacture (DFM) in high-volume production

Harwin Solution

IMS-Compatible Stand-off Socket Solutions

Designed to deliver reliable performance in demanding EV environments, offering:

• Stand-off configuration above the PCB

• Surface-mount termination

• Accurate and repeatable multi-pin alignment

• DFM-friendly assembly

• Reliable operation in high-temperature applications

Explore how Harwin EZi IMS sockets support EV power module designs.

👉 Request a Sample | Download Datasheet| Contact Sales

 

Archer Kontrol in Robotic Arm Systems

Fine-pitch, secure connections designed for compact and precise robotic applications.

Collaborative robotic systems (cobots) demand interconnect solutions that are compact, reliable and optimized for high-precision motion control. Harwin’s Archer Kontrol 1mm pitch connectors provide the ideal balance of space savings, signal integrity and ease of assembly — making them a strong fit for modern industrial robotic arms.

Application

Archer Kontrol connectors are widely used in:

• Collaborative robotic arms

• Industrial automation platforms

• Compact PCB modules

• Low-current data transmission systems

Engineering Background

Robotic platforms often require:

• Fine-pitch connectors to maximize PCB space

• Low-current data signal stability

• Error-proof mating orientation for fast production

• Cost-efficient assembly in high-volume builds

The Challenge

To reduce footprint without compromising performance, robotics designers need connectors that:

• Support compact board layouts

• Provide consistent data signal integrity

• Enable fast, error-free assembly

• Include built-in shrouding and polarization

Harwin Solution

Archer Kontrol 1.00mm Pitch Board-to-Cable Connectors

Engineered for automation and robotics, offering:

• Polarized, shrouded housing

• One-direction, foolproof mating

• Space-efficient footprint

• Reliable data signal transfer

• Simple and fast installation on production lines

Download our technical brief for Archer Kontrol to explore PCB layout guidance, recommended mating cycles, and application best practices.

👉 Request a Sample | Download Product Training Module | Contact Sales

 

Long-range Noise Monitoring Built to Last

Milesight WS302 LoRaWAN® Sound Level Sensor

The Milesight WS302 LoRaWAN® Sound Level Sensor is a long-range noise monitoring solution designed for reliable, continuous sound measurement in indoor environments. Built for durability and accuracy, WS302 helps organizations monitor noise levels, ensure compliance, and improve environmental comfort with minimal maintenance.

Key Features

• Accurate Sound Measurement
  Measures sound levels from 30 to 120 dBA, suitable for a wide range of indoor applications.

• LoRaWAN® Long-Range Connectivity
  Enables stable, low-power data transmission over long distances, ideal for scalable IoT deployments.

• Easy NFC Configuration
  Quick setup and configuration via mobile app using NFC, reducing installation time.

• Instant Visual Alerts
  Built-in LED alarm indicator provides immediate on-site noise alerts.

• Compact & Modern Design
  Sleek, unobtrusive form factor designed to blend seamlessly into any indoor environment.

Applications & Markets

The WS302 is ideal for noise monitoring across multiple industries, including:

• Smart Buildings & Offices – Maintain comfortable acoustic environments

• Schools & Universities – Monitor classroom and common area noise levels

• Hospitals & Healthcare Facilities – Support patient comfort and compliance

• Hotels & Commercial Spaces – Improve guest experience and service quality

• Factories & Warehouses – Monitor operational noise for safety and compliance

Download the WS302 Datasheet
Get full technical specifications, installation details, and performance information.

 Request a Sample | Download Datasheet| Contact Sales

Harwin EZi Coin Cell Battery Holders for Secure PCB Power Solutions

High-retention coin cell battery holders engineered for reliable power connectivity in space-constrained PCBs

Harwin Coin Cell Battery Holders from the EZi Range are precision-engineered to deliver secure and reliable power connections for compact electronic assemblies. Designed to maintain consistent electrical contact, these holders support easy battery insertion and replacement while ensuring long-term performance in demanding environments. The EZi Range is ideal for PCB designs where space efficiency, reliability, and ease of assembly are critical.

Key Features

✔ High Retention Force
Ensures secure battery contact and stable electrical performance, even in vibration-prone or portable electronic applications.

✔ Ø12 mm & Ø20 mm Coin Cell Compatibility
Supports industry-standard coin cell sizes, offering flexibility across multiple PCB designs and power requirements.

✔ Compact, PCB-Optimised Design
Designed for space-constrained layouts, enabling efficient PCB routing and high component density.

✔ Easy Battery Replacement
User-friendly design allows quick battery insertion and removal, reducing maintenance time and improving serviceability.

✔ Reliable Mechanical Construction
Robust contact and housing design ensures consistent performance and long-term reliability.

✔ Assembly-Friendly Design
Suitable for both manual and automated PCB assembly processes, supporting efficient manufacturing workflows.

Applications & Markets

• Internet of Things (IoT) devices
• Robotics and automation systems
• UAVs and drone electronics
• Smart sensors and monitoring devices
• Consumer and portable electronic products

Product Range

The Harwin EZi Range Coin Cell Battery Holders are available in configurations supporting Ø12 mm and Ø20 mm coin cells, providing design flexibility across multiple electronic applications. The range is suitable for various PCB layouts and power requirements, making it a versatile choice for modern electronic designs

Need More Information?

📄 Technical datasheets & CAD models available
🧪 Evaluation samples upon request
💬 Talk to our sales team for product selection support

👉 Request a Sample | Download Product Training Module | Contact Sales

Summary

Harwin Coin Cell Battery Holders from the EZi Range provide secure battery retention, reliable electrical performance, and compact design flexibility. Engineered for modern electronics, they are a dependable solution for IoT, robotics, and other space-critical applications requiring stable coin cell power connectivity.

 

Industrial Circular Power Connectors

Rugged, Environmentally Sealed Power Solutions

Harwin’s Industrial Circular Power Connectors are designed for reliable power transmission in harsh and demanding environments. Built to meet MIL-DTL-5015 specifications, this connector range delivers high durability, strong environmental protection, and stable electrical performance for industrial and outdoor applications.

Key Features

✔ MIL-DTL-5015 Compliant
Designed to meet military-grade performance standards while remaining cost-effective for industrial use.

✔ IP67 Environmental Sealing
Fully sealed against dust and water ingress. Mated connectors exceed IP67, capable of withstanding submersion up to 1.8m for 48 hours.

✔ 13A Current Rating
Supports up to 13A, with voltage ratings of 500V AC / 700V DC, making it suitable for power supply and control systems.

✔ Flexible Contact Options
Available in 2, 3, 4, or 6 contacts, supporting 16–22 AWG wire using solder bucket termination (no crimp tools required).

✔ High Durability
Rated for 500 mating cycles without performance degradation. Robust aluminium shells ensure long-term reliability.

Connector Body Styles

• Straight Plug – Rotating coupling nut, includes rubber bushing as standard

• Cable Connector – Designed for secure cable termination

• Panel Mount Receptacle – Enables reliable cable-to-panel connections with gasket sealing

All body styles are available with pin (male) or socket (female) contacts for maximum design flexibility and safer power-side configurations.

Accessories Available

• Rubber Bushings – Provide bend protection and rear sealing

• Protective Dust Caps – Maintain IP67 rating when connectors are not in use

Typical Applications

These connectors are ideal for applications requiring robust and dependable power connections, including:

• Industrial Machinery

• Robotic Control Systems

• Outdoor Signalling Equipment

• Wireless Base Stations

• Construction & Heavy Vehicles

• COTS Defence Applications

 

Need More Information?

📄 Technical datasheets & CAD models available
🧪 Evaluation samples upon request
💬 Talk to our sales team for product selection support

👉 Request a Sample | Download Datasheet | Contact Sales

Summary

Harwin Industrial Circular Power Connectors are rugged, environmentally sealed power connectors designed for reliable performance in harsh industrial environments. Compliant with MIL-DTL-5015 and exceeding IP67 sealing, this range supports up to 13A current and 500V AC / 700V DC, making it ideal for industrial machinery, outdoor equipment, and power distribution applications where durability and reliability are critical.

 

Understanding Gecko Connectors: Compact, Lightweight & Built for Reliability

Harwin’s Gecko range is engineered for applications that demand high performance in the smallest possible footprint. With a 1.25mm pitch, Gecko connectors deliver exceptional space and weight savings — making ideal for robotics, UAVs, industrial automation, and any system where every gram and millimeter matters.

Why Gecko Connectors Excel in Harsh Environments?

1. Compact & Lightweight Design

Gecko connectors offer up to 45% space and 75% weight reduction compared to similar-performance connectors. This enables more efficient layouts in dense electronic assemblies.

2. High-Reliability Performance

Designed for harsh environments, Gecko withstands:

• Shock up to 100g

• Vibration up to 20g

• Operating temperatures from -65°C to +150°C
  This ensures stable performance in motion-heavy and mission-critical applications.

3. Secure Locking Mechanisms

Available in latching and screw-lock versions, Gecko connectors maintain strong retention — reducing the risk of disconnection in high-vibration environments such as drones and robotic arms.

4. Power & Signal Flexibility

Choose from standard Gecko (up to 2A per contact) or Gecko-MT mixed-technology versions that deliver 2A signal + 10A power in one compact connector.
This simplifies cabling and improves system efficiency.

5. Long-Life Durability

Tested for 1,000 mating cycles, Gecko supports repeated use with consistent mechanical and electrical performance.

Where Gecko is Commonly Used

🤖 Robotics & automation

🛩️ UAVs and aerospace platforms

🛡️ Defense systems

⚙️ Industrial motion control

📦 Compact embedded electronics

 

Gecko Product Range

1. G125 Series

• 1.25mm pitch

• Signal contacts (up to 2A)

• Board-to-cable, board-to-board, cable-to-cable

• Options: friction latch, locking, vertical, horizontal

2. G125-MT Series (Gecko-MT – Mixed Technology)

• Combines signal + power contacts

• Signal: 2A · Power: up to 10A

• Suitable for compact systems requiring both power delivery and data transmission.

3. Gecko-SL (Secure Locking)

• Screw-lock hardware

• For extreme vibration or military/defense platforms.

4. Gecko Screw-Lok Cable Assemblies

• Pre-crimped cable assemblies

• Available off-the-shelf for quick prototyping.

 

Need help choosing the right Gecko connector?

Request a sample

 

Summary

Gecko connector provides compact and lightweight performance in robotics applications, UAVs, and industrially. The Gecko connector has a pitch of only 1.25mm and provides up to 45% area and 75% weight reduction along with robust shock, vibration, and high-temperature performance. Gecko connector also provides applications of the signals only, combined power signals (Gecko MT), and secure-lock flavors.

 

Embedded or Internal? Which Fits Your Design?

Compact design · Optimized performance · Application-specific solutions

Choosing the right antenna is critical to ensure reliable wireless performance in your device. Harwin Asia offers both Embedded and Internal Antennas, each suited to different applications. Understanding their differences helps engineers optimize signal quality, reduce interference, and save PCB space.

Key Features:

Embedded Antennas:

• LDS or Ceramic Type

• Compact form factor

• Strong, stable RF performance

 

Internal Antennas:

• PCB / Flexible PCB Type

• Fits inside enclosure

• Easy integration, reduced assembly time

Applications & Market

Both antenna types support wireless technologies such as GNSS, LTE, Wi-Fi, Bluetooth, ISM, and 5G.
They are commonly used across:

• IoT & Smart Devices – sensors, modules, and compact wireless products

• Consumer Electronics – handhelds, portable devices, wearables

• Industrial & Automation – control units, asset tracking, monitoring systems

• Automotive & Telematics – in-vehicle connectivity, tracking, diagnostics

 

Product Range

Harwin MMi Antenna families include:

• Embedded Antennas – Ceramic, LDS-based compact antennas

• Internal Antennas – PCB, FPC, and adhesive-mounted internal antennas

 

Need help choosing the right antenna?

Share Your Antenna Requirements Tell us your device size, frequency bands, and target application — we’ll recommend the best model.

Submit your requirement

 

Summary

Choosing between Embedded and Internal Antennas depends on device requirements, space constraints, and performance needs. Harwin’s antenna range ensures reliable wireless connectivity while maintaining optimal form factor and efficiency.