A Battery Management System (in English, battery management system, BMS) is an electronic system that manages a rechargeable battery (cell or battery),[1] for example, by protecting the battery from operating outside its safe operating area (Safe Operating Area,),[2] tracking its status, calculating secondary data, reporting that data, controlling its environment, authenticating and/or balancing the battery. same.[3][4].
A battery pack that has a battery management system and external data bus communication is a smart battery pack. A smart battery pack needs to be recharged by a smart battery charger.
Main Functions of a Battery Management System
The BMS consists of two main elements: master board and cell monitoring board. In low voltage battery management systems (<72V) you can find products that include both functions on a single board or circuit. The main functions that a battery management system must cover are the following:
The battery modules incorporate between 10 and 28 cells. The cell monitoring board (in English, cell monitoring device, CMD) monitors the voltage and temperature of these cells to transmit this information to the Master board.
High voltage battery management systems are recommended to include a battery insulation measure that monitors its correct electrical status and, in the event of loss of insulation, can activate the corresponding safety measure.
The SoC represents the percentage of available capacity in the battery with respect to its total capacity. In simple terms, the SoC acts as an indicator of the "energy level" of a battery, allowing you to know how much energy is available for use. For example, an SoC of 100% indicates that the battery is fully charged, while an SoC of 0% translates to a completely discharged battery. This parameter is essential to optimize the operation of electronic devices, electric vehicles and energy storage systems. In practice, the SoC is set at thresholds between 100% and minimum (20% for example) to protect the batteries.
There are several methods for estimating SoC, and each has advantages and limitations depending on operating conditions and battery type. The most common approaches are described below:.
Battery Management (Storage)
Introduction
A Battery Management System (in English, battery management system, BMS) is an electronic system that manages a rechargeable battery (cell or battery),[1] for example, by protecting the battery from operating outside its safe operating area (Safe Operating Area,),[2] tracking its status, calculating secondary data, reporting that data, controlling its environment, authenticating and/or balancing the battery. same.[3][4].
A battery pack that has a battery management system and external data bus communication is a smart battery pack. A smart battery pack needs to be recharged by a smart battery charger.
Main Functions of a Battery Management System
The BMS consists of two main elements: master board and cell monitoring board. In low voltage battery management systems (<72V) you can find products that include both functions on a single board or circuit. The main functions that a battery management system must cover are the following:
The battery modules incorporate between 10 and 28 cells. The cell monitoring board (in English, cell monitoring device, CMD) monitors the voltage and temperature of these cells to transmit this information to the Master board.
High voltage battery management systems are recommended to include a battery insulation measure that monitors its correct electrical status and, in the event of loss of insulation, can activate the corresponding safety measure.
The SoC represents the percentage of available capacity in the battery with respect to its total capacity. In simple terms, the SoC acts as an indicator of the "energy level" of a battery, allowing you to know how much energy is available for use. For example, an SoC of 100% indicates that the battery is fully charged, while an SoC of 0% translates to a completely discharged battery. This parameter is essential to optimize the operation of electronic devices, electric vehicles and energy storage systems. In practice, the SoC is set at thresholds between 100% and minimum (20% for example) to protect the batteries.
Accurate monitoring of the SoC is essential to optimize the use of stored energy, ensuring the greatest possible autonomy in electric vehicles and storage systems. It is also key to preventing both overcharging and deep discharge, conditions that could damage the battery, reduce its capacity and shorten its useful life. In addition, the SoC contributes significantly to improving the safety of the system by avoiding risk situations such as overheating or short circuits that could be generated by incorrect management of the state of charge. Finally, accurate monitoring of the SoC allows the need for recharging or replacement to be anticipated in advance, facilitating more efficient maintenance planning.
Accurate SoC estimation can face several challenges. On the one hand, the natural degradation of batteries over time affects their capacity and complicates related calculations. On the other hand, extreme temperature conditions, whether high or low, influence the performance of the battery and the precision of the models used to estimate the SoC. Additionally, in systems where batteries are connected in parallel or series, uneven charge distributions can make efficient and accurate monitoring difficult.
The contactor control function in a Battery Management System (BMS) is to manage the electrical contactors (high power switches) that connect or disconnect the battery pack from the rest of the electrical system, such as the inverter, charger or external loads. Among the functions that contactors have, the following stand out:
Battery management systems usually incorporate the control of up to 4 contactors to activate the different functions. However, the trend in the automotive market is to increase the number of contactors per system in order to include greater and better safety functions.
There are several methods for estimating SoC, and each has advantages and limitations depending on operating conditions and battery type. The most common approaches are described below:.
Accurate monitoring of the SoC is essential to optimize the use of stored energy, ensuring the greatest possible autonomy in electric vehicles and storage systems. It is also key to preventing both overcharging and deep discharge, conditions that could damage the battery, reduce its capacity and shorten its useful life. In addition, the SoC contributes significantly to improving the safety of the system by avoiding risk situations such as overheating or short circuits that could be generated by incorrect management of the state of charge. Finally, accurate monitoring of the SoC allows the need for recharging or replacement to be anticipated in advance, facilitating more efficient maintenance planning.
Accurate SoC estimation can face several challenges. On the one hand, the natural degradation of batteries over time affects their capacity and complicates related calculations. On the other hand, extreme temperature conditions, whether high or low, influence the performance of the battery and the precision of the models used to estimate the SoC. Additionally, in systems where batteries are connected in parallel or series, uneven charge distributions can make efficient and accurate monitoring difficult.
The contactor control function in a Battery Management System (BMS) is to manage the electrical contactors (high power switches) that connect or disconnect the battery pack from the rest of the electrical system, such as the inverter, charger or external loads. Among the functions that contactors have, the following stand out:
Battery management systems usually incorporate the control of up to 4 contactors to activate the different functions. However, the trend in the automotive market is to increase the number of contactors per system in order to include greater and better safety functions.