Sanwang Communication BMS Solution: Building a Safety Network for Energy Storage

With the rapid development of new energy technologies, the market for Battery Management Systems (BMS) in energy storage is poised for unprecedented growth. According to forecasts from professional agencies, the market size for energy storage BMS in China could reach approximately 17.8 billion yuan by 2025, with third-party BMS providers holding a significant share.

Challenges Facing the Industry

Despite this promising growth, the industry is confronted with several critical technical challenges that need to be addressed:

• Inconsistency among Individual Batteries: Variations in performance among individual batteries arise due to factors such as manufacturing processes and usage environments. This inconsistency becomes particularly pronounced when batteries are connected in series or parallel, leading to a reduction in overall system capacity.
• Circulating Current Issues: Directly paralleling battery packs can result in circulating currents during charging and discharging. This not only wastes energy but also increases thermal losses, accelerating battery aging.
• Barrel Effect: The overall performance of a battery pack is limited by its weakest link. The battery with the smallest capacity restricts the maximum charge and discharge capabilities of the entire system, adversely affecting the efficiency and lifespan of the energy storage system.

Sanwang Communication’s Solution

To address these challenges, Sanwang Communication has developed a safe and reliable BMS system solution. This solution is designed with a three-tier architecture—comprising a subordinate Battery Management Unit (BMU), a main Battery Control Management Unit (BCMU), and a central Battery Supervisory Management Unit (BSMU)—and utilizes CAN and Ethernet communication methods for efficient data exchange.

Specific Features of the Solution:

• Subordinate BMU: Capable of accurately collecting voltage and temperature information from up to 64 battery cells while supporting passive balancing to effectively mitigate inconsistencies among individual batteries. This module uses industrial-grade specialized chips, ensuring high accuracy, strong resistance to interference, and high reliability, all within a compact structure.
• Main BCMU: Features a variety of interface options and high-precision data collection capabilities, ensuring comprehensive and accurate monitoring of battery status.
• Central BSMU: With a separable design (main control and display control), it is applicable in various fields such as large-scale energy storage and industrial storage. It can operate independently or in combination with other critical devices such as Power Conversion Systems (PCS) and temperature control units.

Advantages of the Solution

• High Accuracy: Excellent data collection technology and multidimensional fault diagnosis mechanisms ensure a high level of information accuracy.
• Comprehensive Coverage: Not only does it cover core BMS functionalities, but it also includes PCS control, temperature regulation, and fire safety, achieving true full lifecycle management.
• Specialized Chips: The use of industrial-grade specialized chips guarantees high accuracy, strong resistance to interference, and high reliability, making them widely used in energy storage projects.
• Rich Interfaces: Equipped with Ethernet communication capabilities, it supports core data uploads within 100 milliseconds, boasts a variety of communication interfaces, and includes CAN-FD functionality, high-voltage collection, and precise current collection.
• Multi-Protocol Compatibility: Supports customizable development of protocols such as IEC104, Modbus, and MQTT through dynamic plugins.
• Intelligent Operation and Maintenance: Supports cloud-edge collaboration and remote operation and maintenance services, as well as secondary development of cloud platform interfaces.

In conclusion, Sanwang Communication’s BMS solution represents a significant advancement in building a safe and efficient energy storage ecosystem, addressing the critical challenges faced by the industry.