Battery management system for energy storage power station

Abstract

The utility model relates to a battery management system for an energy storage power station, which belongs to the technical field of power station management equipment and comprises a master control unit, each master control unit is connected with a plurality of master control units through a CAN (controller area network) bus, each battery cluster is correspondingly provided with one master control unit, each master control unit is connected with a plurality of slave control units through a CAN bus, and the slave control units are connected with the master control units. Each single battery is correspondingly provided with one slave control unit; each single battery is equipped with one slave control unit, so that the accurate monitoring of the level of the single battery is realized. The cooperative work between the master control unit and the slave control unit realizes the real-time monitoring of the state of the battery. According to the distributed monitoring, a monitoring blind area caused by a large number of battery monomers and large performance difference in a traditional centralized monitoring mode is effectively avoided, the abnormal state of the battery monomers can be found and processed in time, and the monitoring accuracy and reliability are remarkably improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of power station management equipment, and in particular relates to a battery management system for energy storage power stations. Background Art

[0002] With the transformation of the global energy mix and the rapid development of renewable energy, energy storage power stations are becoming increasingly important as key infrastructure for balancing grid supply and demand and improving energy efficiency. The core of an energy storage power station lies in the battery system, and the performance of the battery management system directly impacts the safety, reliability, and economic viability of the station. The battery management system (BMS), the "brain" of the battery system, is responsible for monitoring battery status, managing the charging and discharging process, protecting battery safety, and optimizing battery efficiency.

[0003] In energy storage power stations, battery systems typically consist of numerous battery cells, which are connected in series or parallel to form battery clusters, which in turn comprise the entire battery system. Due to performance differences between battery cells and the impact of various environmental factors during use, precise monitoring and management of each battery cell and battery cluster are required to ensure the overall performance and safety of the battery system.

[0004] Traditional battery management systems often use centralized monitoring, making it difficult to accurately monitor individual battery cells and battery clusters. Due to the large number of battery cells and their significant performance variations, centralized monitoring can easily overlook abnormal conditions in individual cells, leading to safety risks. Utility Model Content

[0005] The purpose of this utility model is to provide a battery management system for energy storage power stations to solve the problems existing in the prior art.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] A battery management system for an energy storage power station includes a master control unit, each of which is connected to a plurality of master control units via a CAN bus. Each battery cluster is provided with a master control unit. Each master control unit is connected to a plurality of slave control units via a CAN bus. Each battery cell is provided with a slave control unit.

[0008] Each battery cluster includes a plurality of battery cells connected in series, the positive electrode of the battery cluster is connected to the first end of the control switch unit through a fuse, the second end of the control switch unit is connected to the external power supply through a circuit breaker, and the control switch unit is connected to the output end of the main control unit, the negative electrode of the battery cluster is connected to the first end of the shunt, and the second end of the shunt is connected to the external power supply through the circuit breaker, an insulation monitor is installed on the connection line between the shunt and the circuit breaker, a first voltage transformer is provided on the line between the fuse and the control switch unit, and the shunt, insulation monitor and first voltage transformer are all connected to the input end of the main control unit;

[0009] Each battery cell is provided with a second voltage transformer and a temperature sensor, and both the second voltage transformer and the temperature sensor are connected to the input end of the slave control unit.

[0010] A further improvement of the present technical solution is that the control switch unit includes a main contactor, a pre-charging branch and a pre-charging contactor, the main contactor and the pre-charging contactor are both connected to the output end of the main control unit, the first end of the main contactor normally open switch is connected to the circuit breaker, the second end of the main contactor normally open switch is connected to the fuse, the first end of the pre-charging contactor normally open switch is connected to the circuit breaker through the pre-charging branch, and the second end of the pre-charging contactor normally open switch is connected to the fuse.

[0011] A further improvement of the technical solution is that the pre-charging branch includes a pre-charging resistor and a pre-charging capacitor arranged in parallel.

[0012] A further improvement of the technical solution is that it also includes a human-computer interaction screen, which is connected to the main control unit via an RS485 communication line.

[0013] A further improvement of the technical solution is that the first voltage transformer adopts a voltage transformer of model 81M / GY-B110G3.

[0014] A further improvement of this technical solution is that the insulation monitor adopts an insulation monitor with model GYIK-8MCA01.

[0015] A further improvement of the technical solution is that the second voltage transformer adopts a voltage transformer with model M314600.

[0016] A further improvement of this technical solution is that the temperature sensor adopts a PT100 temperature sensor.

[0017] The beneficial effects of the present invention are:

[0018] Improved Monitoring Accuracy: By equipping each battery cell with a slave control unit, precise monitoring at the cell level is achieved. The coordinated operation of the master and slave control units enables real-time monitoring of battery status. This distributed monitoring effectively avoids the blind spots caused by the large number of battery cells and their widely varying performance in traditional centralized monitoring methods. It enables timely detection and resolution of abnormal battery cell conditions, significantly improving monitoring accuracy and reliability.

[0019] Enhanced system safety: The battery cluster design incorporates safety protection devices such as fuses, control switch units, circuit breakers, and insulation monitors, forming a multi-layered safety protection mechanism. When abnormal conditions such as short circuits and overcurrents occur in the battery system, these devices quickly respond, disconnecting the faulty circuit and preventing further damage, effectively ensuring the safe operation of the energy storage power station.

[0020] In addition, the utility model has a reliable design principle, a simple structure and a very broad application prospect.

[0021] It can be seen that compared with the prior art, the present invention has outstanding substantial features and significant progress, and the beneficial effects of its implementation are also obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic block diagram of the battery management system is shown in FIG.

[0023] 110 is the main control unit, 120 is the master control unit, 130 is the slave control unit, 140 is the battery cell, 150 is the fuse, 161 is the master contactor normally open switch, 162 is the pre-charging branch, 163 is the pre-charging contactor normally open switch, 170 is the circuit breaker, 180 is the shunt, 190 is the insulation monitor, 200 is the first voltage transformer, 210 is the second voltage transformer, 220 is the temperature sensor, 230 is the human-machine interaction screen, and 240 is the 24V DC power supply. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will be combined with the drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0026] like Figure 1 As shown, the utility model provides a battery management system for an energy storage power station, including a master control unit, each master control unit is connected to 12 master control units via a CAN bus, each battery cluster is correspondingly provided with a master control unit, each master control unit is connected to 8 slave control units via a CAN bus, and each battery cell is correspondingly provided with a slave control unit.

[0027] Specifically, each battery cluster includes several battery cells connected in series. The positive terminal of the battery cluster is connected to the first end of the control switch unit via a fuse. The second end of the control switch unit is connected to an external power supply via a circuit breaker. The control switch unit is connected to the output of the main control unit. The negative terminal of the battery cluster is connected to the first end of a shunt. The second end of the shunt is connected to the external power supply via a circuit breaker. An insulation monitor is installed on the connection line between the shunt and the circuit breaker. A first voltage transformer is installed on the line between the fuse and the control switch unit. The shunt, insulation monitor, and first voltage transformer are all connected to the input of the main control unit. The first voltage transformer is model 81M / GY-B110G3, and the insulation monitor is model GYIK-8MCA01.

[0028] In addition, each battery cell is equipped with a second voltage transformer and a temperature sensor, both of which are connected to the input of the slave control unit. The second voltage transformer uses the M314600 model, and the temperature sensor uses the PT100 model.

[0029] The control switch unit includes a main contactor, a pre-charging branch, and a pre-charging contactor. The main contactor and the pre-charging contactor are both connected to the output end of the main control unit. The first end of the main contactor's normally open switch is connected to the circuit breaker, and the second end of the main contactor's normally open switch is connected to the fuse. The first end of the pre-charging contactor's normally open switch is connected to the circuit breaker via the pre-charging branch, and the second end of the pre-charging contactor's normally open switch is connected to the fuse. Specifically, the pre-charging branch includes a pre-charging resistor and a pre-charging capacitor arranged in parallel.

[0030] In order to facilitate the staff to manage the batteries in the energy storage power station, the management system also includes a human-computer interaction screen, which is connected to the main control unit via an RS485 communication line.

[0031] In addition, the management system also includes a 24V DC power supply, which supplies power to the master control unit and the slave control unit.

[0032] The above disclosure is only a preferred embodiment of the present invention, but the present invention is not limited thereto. Any non-creative changes that can be thought of by technicians in this field, as well as several improvements and modifications made without departing from the principles of the present invention, should fall within the scope of protection of the present invention.

Claims

1. A battery management system for an energy storage power station, characterized in that: It includes a master control unit, each of which is connected to several master control units via a CAN bus. Each battery cluster is provided with a master control unit. Each master control unit is connected to several slave control units via a CAN bus. Each battery cell is provided with a slave control unit. Each battery cluster includes a plurality of battery cells connected in series, the positive electrode of the battery cluster is connected to the first end of the control switch unit through a fuse, the second end of the control switch unit is connected to the external power supply through a circuit breaker, and the control switch unit is connected to the output end of the main control unit, the negative electrode of the battery cluster is connected to the first end of the shunt, and the second end of the shunt is connected to the external power supply through the circuit breaker, an insulation monitor is installed on the connection line between the shunt and the circuit breaker, a first voltage transformer is provided on the line between the fuse and the control switch unit, and the shunt, insulation monitor and first voltage transformer are all connected to the input end of the main control unit; Each battery cell is provided with a second voltage transformer and a temperature sensor, and both the second voltage transformer and the temperature sensor are connected to the input end of the slave control unit.

2. The battery management system for energy storage power station according to claim 1, characterized in that: The control switch unit includes a main contactor, a pre-charging branch and a pre-charging contactor. The main contactor and the pre-charging contactor are both connected to the output end of the main control unit. The first end of the main contactor normally open switch is connected to the circuit breaker, and the second end of the main contactor normally open switch is connected to the fuse. The first end of the pre-charging contactor normally open switch is connected to the circuit breaker through the pre-charging branch, and the second end of the pre-charging contactor normally open switch is connected to the fuse.

3. The battery management system for energy storage power station according to claim 2, characterized in that: The pre-charging branch includes a pre-charging resistor and a pre-charging capacitor connected in parallel.

4. The battery management system for energy storage power station according to claim 1, characterized in that: It also includes a human-computer interaction screen, which is connected to the main control unit via an RS485 communication line.

5. The battery management system for energy storage power station according to claim 1, characterized in that: The first voltage transformer adopts a voltage transformer of model 81M / GY-B110G3.

6. The battery management system for energy storage power station according to claim 1, characterized in that: The insulation monitor used is the GYIK-8MCA01 insulation monitor.

7. The battery management system for an energy storage power station according to claim 1, characterized in that: The second voltage transformer uses a voltage transformer with model M314600.

8. The battery management system for an energy storage power station according to claim 1, characterized in that: The temperature sensor used is a PT100 temperature sensor.

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