A battery management system (BMS) is an electronic control unit that monitors and manages the performance of rechargeable batteries. It is a critical component of battery-powered

systems. The BMS ensures the battery operates within safe limits, maximizes its lifespan, and maintains optimal performance. 

What are battery systems?  

A commercial building battery system is a type of energy storage system designed to provide backup power, reduce energy costs, and improve the overall efficiency. It consists of a battery bank, a battery management system (BMS), and a power conversion system that converts DC power from the batteries into AC power for use in the building’s electrical system. 

How are battery systems used?  

Commercial building battery systems are typically used in conjunction with renewable energy systems such as solar panels or wind turbines to store excess energy generated during peak production periods. The stored energy can then be used during periods of low production or high demand, reducing the building’s reliance on the grid and lowering energy costs. 

In addition to providing backup power and reducing energy costs, commercial building battery systems can also improve the overall efficiency of the building’s electrical system. By reducing the building’s peak power demand, the system can help to reduce strain on the grid and minimize the risk of power outages. 

Battery systems can also be used to participate in demand response programs, which allow building owners to receive payments for reducing their energy consumption during periods of high demand. By reducing their energy consumption during these periods, building owners can help to stabilize the grid and avoid the need for new power plants or transmission lines. 

What does a BMS do?  

The primary function of a BMS is to protect the battery from damage and failure. Lithium-ion batteries, which are commonly used in renewable energy storage systems, are prone to overcharging, over-discharging, and overheating. These conditions can cause permanent damage to the battery or even lead to fires or explosions. 

The BMS continuously monitors the battery voltage, current, temperature, and other critical parameters to ensure that it operates within safe limits. It also provides real-time feedback to the battery charger or power management system, ensuring the battery is charged and discharged correctly. The BMS can also detect and isolate faulty cells or modules to prevent cascading failures. 

Another critical function of a BMS is to optimize the battery’s performance and lifespan. The BMS can balance the charge and discharge of individual cells or modules within the battery pack, ensuring they operate at similar levels. Cell balancing prevents overcharging or undercharging of individual cells, which can lead to capacity loss or reduced performance. 

The BMS can also provide accurate information about the battery’s state of charge (SOC) and state of health (SOH). SOC refers to the amount of energy remaining in the battery, while SOH indicates the battery’s overall health or capacity. This information is essential for determining the battery’s range, predicting its remaining lifespan, and optimizing its performance. 

How battery management systems help companies transition to renewable energy.  

Battery management systems (BMS) can play a crucial role in helping companies transition to renewable energy by providing a reliable and efficient way to store and manage energy. As companies shift towards renewable energy sources such as solar and wind, they often face the challenge of intermittency, meaning the energy output from these sources can fluctuate depending on weather conditions. By using BMS to store excess energy generated during peak production periods, companies can ensure a steady and reliable supply of energy, even during periods of low production or high demand. 

BMS also helps companies manage the charging and discharging of batteries, optimizing their performance and lifespan. This can result in significant cost savings over time by reducing the need for frequent battery replacements or repairs. Additionally, BMS can help companies participate in demand response programs, which allow them to reduce energy consumption during periods of high demand, providing financial incentives and helping to stabilize the grid. 

Incorporating BMS into renewable energy systems also helps companies reduce their carbon footprint by minimizing their reliance on fossil fuels and lowering greenhouse gas emissions. This can improve their overall sustainability and align with their corporate social responsibility goals. 


Energy management systems and battery management systems  

An energy management system (EMS) can work as a battery management system (BMS) by integrating with the battery bank and monitoring its performance. The EMS can receive real-time data from the BMS, including the battery’s state of charge, state of health, and charging/discharging rates. The EMS can then use this information to optimize the battery’s performance and reduce energy costs. For example, the EMS can prioritize the use of energy from the battery during periods of high demand or when energy prices are high, reducing the building’s reliance on the grid and lowering energy costs. The EMS can also monitor the battery’s performance and alert the building owner or facility manager if any issues arise,  allowing for quick maintenance and repair. Overall, the integration of an EMS with a BMS can enhance the efficiency and reliability of a building’s energy management system, improving the building’s overall performance and reducing energy costs. 

A Battery management system (BMS) is an essential component of rechargeable battery-powered systems. It monitors and manages the battery’s performance, ensuring that it operates within safe limits, optimizing its performance and lifespan. The BMS is critical for electric vehicles, renewable energy storage systems, and portable electronics, ensuring that these devices operate safely, reliably, and efficiently. 

Learn more about how your company can you use an energy management system integrated with your energy storage systems to save money on energy and move toward net zero.