Quick Overview
• Safety is built into every layer of Polarium lithium ion battery modules
• Five independent layers of safety protect telecom and industrial environments
• Redundant BMS monitoring supports operational reliability
• Electrical protection operates independently of site controllers
• Products comply with IEC 62619 and UL 1973 where required
Why Safety Matters for Telecom and Industrial Backup Power
In telecommunications and industrial environments, the battery system is the last line of defence against downtime. Whether protecting a remote telecommunications shelter, a utility control site, or an industrial automation network, battery failure can have serious consequences, from service outages to equipment damage.
Snowy-Hydro-Tumut-Substation, Snowy Mountains, New South Wales
While many operators are transitioning to lithium-ion technology for its performance and lifecycle advantages, Polarium has taken a different approach: building safety into every layer of its products. From the individual cell through to full system integration, Polarium’s design philosophy ensures multiple, independent safety mechanisms that work together to protect assets, people, and networks.
This is not just about meeting a standard. It is about delivering resilience and operational confidence in the most demanding conditions.
The Five Layers of Safety
Cell-Level Safety
Polarium offers both Lithium Iron Phosphate (LFP) and Nickel Manganese Cobalt (NMC) cell chemistries. This allows customers to select the chemistry that best fits their application, balancing energy density, thermal stability, and operational life.
Every cell undergoes extensive testing for overcharge, short-circuit, crush, and thermal abuse. LFP chemistry is well suited to applications prioritising maximum thermal stability and extended cycle life, while NMC offers higher energy density for sites with space limitations.
Module-Level Safety
Cells are assembled into modules with robust enclosures, integrated electrical isolation, and individual fusing. This ensures that a fault in one cell cannot propagate throughout the entire pack.
Polarium uses a patented welding procedure combined with flexible printed power board (PPCB) tracks instead of conventional cabling. This provides superior vibration resistance, reduces mechanical stress on connections, and enhances the long-term durability of the module. The mechanical assembly is designed to withstand harsh operating conditions, including remote telecommunications shelters and industrial control rooms.
Battery Management System (BMS)
The BMS acts as the battery’s control centre, monitoring voltage, current, temperature, and state of charge in real time at both the module and cell level.
Polarium’s BMS incorporates redundant monitoring channels with a watchdog function. This ensures that two independent systems are verifying all key parameters. If one channel detects an anomaly, even without confirmation from the other, the system shuts down as a precaution to prevent unsafe operating conditions.
The BMS also provides operators with high levels of transparency and actionable insight. Real-time and historical performance data can be accessed remotely, enabling predictive maintenance and improving fault diagnosis before a site visit is required.
Electrical Protection Devices
Integrated Current Limiting Devices (CLD™) safeguard both the battery and the connected power system. They control inrush currents, limit charging rates, and prevent overtemperature conditions.
These devices operate independently from external site controllers, providing built-in protection in the event of unexpected faults, such as failed rectifiers, wiring issues, or sudden load increases.
System-Level Safety and Compliance
Polarium batteries are designed to remain safe even if other system components fail. They do not depend on external site management systems for protection.
For the New Zealand market, Polarium products meet the key regulatory and electrical standards required for safe integration into local systems:
- RCM (Regulatory Compliance Mark): Confirms the product meets New Zealand and Australian electrical safety and EMC requirements, including relevant IEC/AS/NZS standards.
- AS/NZS 3004.2: Applicable to electrical installations in marine environments, requiring LiFePO₄ systems to meet specific construction and Battery Management System (BMS) safety requirements.
- IEC 62619 / UL 1973: Widely recognised international standards for the safety and performance of industrial and stationary lithium battery systems, commonly used for large-scale or mission-critical applications.
By meeting these standards, Polarium enables system designers and integrators in New Zealand to confidently deploy lithium battery systems that are both functionally safe and compliant with local regulatory frameworks.
Advantages for Telecom and Industrial Operators
- Increased network resilience by reducing the risk of single-point failures.
- Extended operational life through protection against overcharge, over-discharge, and overheating.
- High operational transparency through detailed monitoring and historical data logging.
- Reduced maintenance costs by enabling remote diagnostics and predictive maintenance.
- Flexibility in choosing the best cell chemistry for the application.
Next in the Series
This is the first article in our Five Layers of Safety series, supplied by Powerbox in partnership with Polarium. Each feature in the series will explore one safety layer in detail, covering the technical architecture, operational principles, and key considerations for integrating these systems into critical telecommunications and industrial applications.
Up next, discover the principles behind Cell-Level Safety in Part 1: Cell-Level Safety. We will examine how Polarium’s choice of chemistry, rigorous cell qualification process, and advanced monitoring systems form the essential foundation for safe, reliable lithium-ion battery operation in mission-critical environments.
Frequently Asked Questions
What is the role of the BMS in lithium ion battery safety?
The BMS monitors all key parameters and uses redundant channels to ensure the system shuts down if abnormal conditions appear.
How do LFP and NMC chemistries differ?
LFP offers higher thermal stability and long cycle life. NMC provides higher energy density for installations with limited space.
Which standards apply to industrial lithium ion batteries in Australia?
IEC 62619 is the primary safety standard for industrial lithium ion energy storage products.
Why are multiple safety layers important for telecom sites?
They provide protection against electrical faults, thermal events, and component failures in remote or unmanned environments.
How do electrical protection devices improve reliability?
CLD devices limit current and protect the battery even when site controllers or rectifiers fail.
