BQ26500PWR Integrated Circuits (ICs)

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Battery management systems (BMS) are electronic components designed to monitor, detect, and regulate the charge of Li-ion and Li-ion-like rechargeable batteries. They are integral to the successful operation of battery packs, to ensure that their overall performance and safety does not degrade over time. The BQ26500PWR is one such system, claiming to be the world’s only dynamically variable charge algorithm BMS that provides the unique ability to detect the Battery State-of-Charge (SoC) and State-of-Health (SoH). This article will discuss the application field and the working principle of this BMS.

The BQ26500PWR is designed for use with single cell lithium-ion, LiFePO4, and Li-ion polymer rechargeable batteries, as well as other variable voltage Li-ion cells. Its primary use is for charging and providing protection for portable devices such as small medical devices, wireless headsets, and digital cameras. It is also used in a wide range of large battery packs such as electric vehicles, energy storage systems, etc. This is because of its high accuracy and robust protection features, which helps improve system performance, increase overall safety and extend the useful life of the battery pack.

The BQ26500PWR is based on TI’s dynamic Variable Charge Algorithm (VCA). This algorithm provides precise SoC and SoH monitoring of batteries at any given time. It also supports automatic charge termination and active cell balancing, alerting users of potential faults and providing real-time information on the battery\'s health. The algorithm utilizes cell resistance tracking and combines this with temporal factors to keep the battery in perfect DC balance.

The working principle of the BQ26500PWR is based on an intelligent four-state controller that monitors the charging and discharging currents and automatically adjusts the charging current to prevent overcharging or undercharging. The system first runs a self-sensing process to determine the battery’s SoC value, which is then constantly monitored throughout the charging process. It instantly reacts to any changes in current, voltage, and temperature by controlling the charging current accordingly to prevent overcharging and undercharging.

The BQ26500PWR also has an integrated cell balancing feature. This feature actively balances the cells of the battery pack by monitoring the individual cell voltages and automatically equalizing them when needed. This helps extend the battery life and keep the system in optimal condition. The BQ26500PWR also includes protection against shorting and overheating. The system immediately shuts down if it detects a short or an unsafe temperature rise and can be manually reset by the user.

In conclusion, the BQ26500PWR is a reliable and accurate Li-ion battery management system with advanced features. It is designed for use with single cells or large battery packs and is ideal for applications such as small medical devices, wireless headsets, and digital cameras. The system is based on TI’s dynamic Variable Charge Algorithm, providing the user with the unique ability to monitor the battery’s State-of-Charge (SoC) and State-of-Health (SoH). It also has cell balancing, protection against shorting and overheating, and other features that make it an ideal choice for battery packs of any size.

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