1. The positions of batteries and their management systems in their respective systems are different.
In the energy storage system, the energy storage battery only interacts with the energy storage converter at high voltage. The converter takes power from the AC grid and charges the battery pack 3s 10p 18650, or the battery pack supplies power to the converter, and the electric energy passes through The converter converts AC into AC and sends it to the AC grid.
For energy storage system communication, the battery management system mainly has information interaction relationships with the converter and energy storage power station dispatching system. 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 PCS, the scheduling system of the energy storage power station.
The BMS of electric vehicles has an energy exchange relationship with the electric motor and charger at high voltage; in terms of communication, it has information exchange with the charger during the charging process. In the entire application process, it has the most detailed communication with the vehicle controller. Information exchange.
2. Different hardware logical structures
The hardware of energy storage management systems generally adopts a two-layer or three-layer model, and larger systems tend to have a three-layer management system.
The power battery management system has only one layer of centralized or two distributed systems, and there is basically no three-layer situation. Small cars mainly use a one-layer centralized battery management system. Two-layer distributed power battery management system.
From a functional perspective, the first 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 added layer on this basis to cope with the huge scale of energy storage batteries.
To use an analogy that is not so appropriate. The optimal number of subordinates for a manager is 7. If the department continues to expand and there are 49 people, then 7 people will have to choose a team leader, and then appoint a manager to manage these 7 team leaders. Beyond personal capabilities, management is prone to chaos. Mapping to the energy storage battery management system, this management capability is the computing power of the chip and the complexity of the software program.
3. There are differences in communication protocols
The energy storage battery management system basically uses the CAN protocol for internal communication, but its communication with the outside, which mainly refers to the energy storage power station dispatching system PCS, often uses the Internet protocol format TCP/IP protocol.
Power batteries and the electric vehicle environment in which they are located all use the CAN protocol. They are only distinguished by the use of internal CAN between the internal components of the battery pack and the use of vehicle CAN between the battery pack and the entire vehicle.
Post time: Nov-16-2023
