Energy storage battery and power lithium battery-Lithium - Ion Battery Equipment

Energy storage battery BMS and power lithium battery BMS -Lithium - Ion Battery Equipment

1. Application scenarios of large-scale energy storage systems

New energy power plants, wind power or solar power plants, in order to achieve the purpose of smoothing output power fluctuations, more and more power plants are beginning to be equipped with energy storage systems.

Independent energy storage power stations, as the reform of the power system gradually enters people's field of vision, independent energy storage power stations that make a living by reselling electricity gradually appear.

Microgrid is a small power supply and distribution network that includes distributed power sources, electrical loads, energy storage systems and grid management systems. In order to ensure the continuity and stability of power consumption of the load, each microgrid will be equipped with an energy storage system.

2. The difference between energy storage battery management system (ESBMS) and power battery management system (BMS)

The energy storage battery management system is very similar to the power battery management system. However, the power battery system is in a high-speed electric vehicle, which has higher requirements on the power response speed and power characteristics of the battery, the SOC estimation accuracy, and the number of state parameter calculations.(Lithium - Ion Battery Equipment)

The scale of the energy storage system is very large, and the centralized battery management system is obviously different from the energy storage battery management system. Here, only the power battery distributed battery management system is compared with it.

2.1 The location of batteries and their management systems in their respective systems is different

In the energy storage system, the energy storage battery only interacts with the energy storage converter at high voltage, and the converter takes power from the AC grid to charge the battery pack; or the battery pack supplies power to the converter, and the electrical energy passes through the converter Converted to AC and sent to the AC grid.

The communication of the energy storage system, the battery management system mainly has an information interaction relationship with the converter and the dispatching system of the energy storage power station. On the one hand, the battery management system sends important status information to the converter to determine the high-voltage power interaction; on the other hand, the battery management system sends the most comprehensive monitoring information to the dispatching system PCS of the energy storage power station.

The BMS of an electric vehicle has an energy exchange relationship with the motor and the charger in terms of high voltage; in terms of communication, there is information exchange with the charger during the charging process, and in the entire application process, it has the most detailed information with the vehicle controller. Information exchange. As shown below.

2.2 The hardware logic structure is different

For the energy storage management system, the hardware generally adopts a two-layer or three-layer model, and the larger scale tends to be a three-layer management system.

The power battery management system has only one layer of centralized or two distributed, and basically there is no three-layer situation. Small cars mainly use a layer of centralized battery management system. The two-layer distributed power battery management system is shown in the figure below.

In terms of functions, the first-layer and second-layer modules of the energy storage battery management system are basically equivalent to the first-layer acquisition module and the second-layer main control module of the power battery. The third layer of the energy storage battery management system is an additional layer on this basis to cope with the huge scale of the energy storage battery.

To make a not so appropriate analogy. The optimal number of subordinates for a manager is 7 people. If the department keeps expanding and there are 49 people, then 7 people have to choose a team leader, and then appoint a manager to manage the 7 team leaders. Beyond individual capabilities, management is prone to confusion.

Mapped to the energy storage battery management system, this management capability is the computing power of the chip and the complexity of the software program.

2.3 The communication protocol is different

The communication between the energy storage battery management system and the interior basically adopts the CAN protocol, but its communication with the outside, mainly refers to the energy storage power station dispatching system PCS, often adopts the Internet protocol format TCP/IP protocol.

The power battery, the electric vehicle environment in which it is located, adopts the CAN protocol, but the internal CAN is used between the internal components of the battery pack, and the vehicle CAN is used to distinguish between the battery pack and the whole vehicle



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