Feature: Energy storage
diverge by approximately 30-50mV. Since balancing usually occurs near the top of the charge cycle, the energy dissipated in passive systems is generally small relative to the total pack capacity.
Challenges in multi-cell systems Designing a battery system involves more than simply combining cells. Engineers must carefully consider system architecture, electrical limits and communication strategies. One of the first questions in any battery design project is the
intended application. A system designed for high-power output will have very different requirements as compared to one designed primarily for energy storage. Tese decisions influence cell chemistry selection, pack configuration and BMS design. As the number of cells increases, so too do the electrical
challenges. Large battery packs might operate at high voltages, which can create differences in ground potential between subsystems. In such cases, communication links between battery modules might require electrical isolation. High-current capability introduces additional design
considerations. Multiple MOSFETs placed in parallel could be necessary to safely handle the current load, while protective devices such as fuses or circuit breakers are oſten used as a final safeguard against excessive current. Another challenge arises from electrical noise. High-current
switching can create noisy ground planes, which could interfere with sensitive measurement circuits. Designers must therefore carefully manage PCB layout to maintain clean reference signals for the control electronics.
Thermal management considerations Temperature control is another key aspect of battery power management. Battery packs typically incorporate temperature sensors at multiple locations throughout the assembly. Tese sensors report temperature data to the BMS, which allows the system to detect overheating conditions and shut down the pack if necessary. Balancing circuits can also generate heat, particularly in passive
balancing systems where excess energy is dissipated through resistors. To prevent localised hotspots, many systems avoid balancing adjacent cells simultaneously. Power electronics, such as MOSFETs, occasionally require
additional cooling measures when handling high-current loads. In some cases, these components are mounted on heat sinks or supported by forced airflow. Cell arrangement within the enclosure also plays an important
role. Early battery designs oſten separate cells with insulating materials to reduce thermal interaction. Today, more advanced systems incorporate new approaches to temperature control, including liquid cooling methods, although these designs are still emerging in commercial products. Even enclosure design can influence thermal performance. A
completely sealed enclosure might trap heat and slow cooling times, potentially causing the battery pack to reach its temperature limits during sustained operation.
Validation, testing and certification Before battery systems can reach the market, they must undergo extensive validation and certification testing. Battery packs are commonly subjected to high charge and discharge cycles to ensure the BMS responds correctly when operating conditions exceed safe limits. Multiple certification bodies such as Underwriters
Laboratory (UL) in the US, International Electrotechnical Commission (IEC) and the United Nations (UN) set forward a list of standards that almost all electrical products, especially battery systems, must meet. Many of these standards outline tests that the system must survive to be deemed safe for use in commercial settings, such as safe discharge cutoff, fire propagation behaviour and safety during shipping and handling from factory to field. Environmental testing typically also includes drop,
vibration and shock testing to verify that the pack remains structurally sound under mechanical stress. Certification bodies occasionally evaluate whether the system can withstand these conditions without leaking, failing structurally or presenting a safety hazard. Additionally, manufacturing processes can be certified under quality standards such as AS9100 or ISO 9001, ensuring consistent production and traceability. Te use case for the system, where it’s to be installed and
how it’s going to be used change the set of standards to which the battery system must be built and tested. While most battery systems may share some tests, such as UN 38.8 for shipping and handling, a battery backup system for a factory setting is going to have a whole different set of challenges to withstand compared to a battery system in someone’s cell phone.
Emerging BMS developments Advances in monitoring and analytics are continuing to improve the performance of battery systems. One example is improved state-of-charge estimation. New algorithms and integrated circuits are being developed to more accurately estimate battery capacity during operation, enabling systems to better predict available energy and manage usage accordingly. At the same time, research into new battery chemistries
continues. One of the most widely discussed emerging technologies is the solid-state battery, which replaces the liquid electrolyte used in many lithium-ion cells with a solid material. Tis design has the potential to improve safety by reducing flammable components, whilst enabling higher energy density. Although solid-state technology is still in the early stages
of commercialisation, it represents a promising direction for future energy storage systems. Despite these advances, the fundamentals of battery
management remain consistent by monitoring voltage, balancing cells and regulating charge and discharge cycles. In other words, the core challenge of power management – ensuring stored energy can be delivered safely and reliably – remains at the centre of battery system design.
www.electronicsworld.co.uk May 2026 41
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