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You can read this article in detail to understand the difference between energy storage battery BMS and power lithium-ion battery BMS, so as to distinguish the two more thoroughly.
The energy storage battery management system is very similar to the power lithium-ion battery management system. However, the power lithium-ion battery system is in a high-speed electric vehicle, which has higher requirements for the battery’s power response, speed and power characteristics, SOC estimation accuracy, and the number of state parameter calculations.
The scale of the energy storage system is extremely large, and the difference between the centralized battery management system and the energy storage battery management system is clear. The following mainly compares the energy storage battery BMS and the power lithium-ion battery BMS.
The location of the battery and its management system in each system is different
In the energy storage system, the energy storage battery only interacts with the energy storage converter at high voltage. The converter takes electricity from the AC grid to charge the battery pack, or the battery pack supplies power to the converter, and the electric energy passes through the converter Convert it into AC and send it to the AC grid.
The communication of the energy storage system and the battery management system must have an information interaction relationship with the converter and the energy storage power station dispatching system.
On the one hand, the battery management system sends critical 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 of the energy storage power station’s dispatching system.
The hardware logical structure is different
For energy storage management systems, the hardware generally adopts a two-tier or three-tier model, and the larger scale tends to be a three-tier management system.
The power lithium-ion battery management system only has one-layer aggregation or two-distribution, and there is basically no three-layer situation. Small cars need to use a layer of the centralized battery management system.
From a functional point of view, 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 lithium-ion battery. The third layer of the energy storage battery management system is a new layer on this basis to cope with the huge scale of energy storage batteries.
The communication protocol is different
The energy storage battery management system and internal communication basically use the CAN protocol, but its communication with the outside, the external key refers to the energy storage power station dispatching system PCS, often adopts the Internet protocol format TCP/IP protocol.
The power lithium-ion battery uses the CAN protocol in the general environment of the electric vehicle, but it is distinguished by the use of internal CAN between the internal components of the battery pack and the whole vehicle CAN between the battery pack and the entire vehicle.
The types of batteries used in energy storage power stations are different, and the management system parameters are quite different.
For safety and economic considerations, energy storage power stations often use lithium iron phosphate when choosing lithium-ion batteries, and some energy storage power stations use lead-acid batteries and lead-carbon batteries. The current mainstream battery types for electric vehicles are lithium iron phosphate batteries and ternary lithium-ion batteries.
Different battery types have huge differences in external characteristics, and battery models are completely unusable. The battery management system and the battery cell parameters must have a one-to-one correspondence. The specific parameter settings of the same type of batteries produced by different manufacturers will not be the same.
The threshold setting tends to be different
Energy storage power stations have relatively ample space and can accommodate more batteries. However, some power stations are remote and inconvenient to transport. Large-scale battery replacement is more difficult.
The expectation of the energy storage power station for the battery cell is to have a long life and not to fail. Based on this, the upper limit of its operating current will be set relatively low, so that the battery core will not work at full load. The energy characteristics and power characteristics of the battery should not be particularly high.
The powerful lithium-ion battery is different. In the limited space of the vehicle, it is hard to install the battery, hoping to maximize its ability. Therefore, the system parameters will refer to the limit parameters of the battery, and such use conditions are bad for the battery.
The number of state parameters required to be calculated is different between the two
SOC is a state parameter that must be calculated for both. But until today, energy storage systems do not have a unified requirement, and what state parameter calculation capabilities are necessary for energy storage battery management systems. In addition, the use environment of energy storage batteries is relatively abundant, and the environment is stable, and small deviations are not easy to be perceived in large systems.
Therefore, the computing power requirement of the energy storage battery management system is relatively lower than that of the powerful lithium-ion battery management system, and the corresponding single-string battery management cost is not as high as that of the powerful lithium-ion battery.
Lithium battery energy storage systems are widely used in microgrids and can play an irreplaceable role. As an expert in lithium battery research for many years, RENON can give you some professional guiding advice to a certain extent.
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