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How To Improve The Reliability Of Storage Battery Management System

Mar 04, 2018

The use of large battery arrays as backup and continuously powered energy storage systems is gaining increasing attention, as evidenced by Tesla Motor's recent introduction of the home and commercial Powerwall system. The batteries in such systems are continuously charged by the grid or other energy sources and then supplied to the user with AC (AC) power through the Dc/ac inverter.

How to improve the reliability of storage battery management system

Battery As a backup power is not new, there are many kinds of battery backup power system, such as basic 120/240v AC and hundreds of Watts Power desktop PC Short-term backup power system, ships, hybrids or all-electric vehicles using the thousands of-watt special travel back-up power system, Telecommunications systems and data center use of power grid series Baichi backup power system (see Figure 1) ... Wait a minute. While advances in battery chemistry and battery technology are a major concern, there is an equally crucial part of a viable and battery-backed system, the Battery Management system (BMS).

The battery backup power is ideal for fixed and mobile use from thousands of watts to hundreds of KW power, reliable and efficient for a variety of uses.

For energy storage use to complete the battery management system, there are many challenges, the solution is not from small, lower capacity battery pack management system simply "extended". Instead, new, more complex strategies and key support components are needed.

The starting point of the challenge is that a lot of key battery parameters measured value with high accuracy and credibility. In addition, the planning of a child system must be modular to be able to tailor the configuration to the specific requirements used, as well as to consider possible extension requirements, overall management issues, and necessary maintenance.

How to improve the reliability of storage battery management system

The work environment for larger storage arrays also poses other major challenges. Under the condition that the inverter voltage is very high/the current is large and the current spike is generated, BMS must supply accurate and common data in the noisy electrical environment and often in a high temperature environment. In addition, BMS must provide a wide range of "fine" data for internal modules and system temperature measurements, rather than a limited amount of rough aggregate data, which is essential for charging, monitoring, and discharging.

Because of the important role of these power systems, their reliability is inherently critical. To make this easily stated goal a reality, BMS must ensure data accuracy and completeness as well as continuous health assessments so that the BMS can continue to take the required action. The completion of solid planning and reliable security is a multi-level process, the BMS must target all child systems expected to be possible problems, perform self-test and provide fault detection, and then in standby mode and work mode to choose the appropriate action. The final requirement is that the BMS must meet a number of stringent regulatory requirements because of high voltage, high current and high power.

System planning transforms concepts into real-world outcomes

Although the supervision of rechargeable batteries from the concept is very simple, just the voltage and current measurement circuit at the battery terminals can, but the reality of the BMS is very different, it is much more complex.

The robust planning begins with the overall supervision of each battery, which puts forward some important requirements for simulating the function of the circuit. The battery readings need to be up to MV and MA level accuracy, and the voltage and current measurements must be simultaneous to calculate the power. BMS must evaluate the effectiveness of each measurement, as it requires maximum data integrity, and the BMS must also identify faulty or problematic readings. BMS cannot ignore unusual readings because the readings may indicate potential problems, but at the same time BMS cannot act on the wrong data.