An inter-cluster balancing device for energy storage system

Abstract

The utility model relates to the field of electrochemical battery systems, and in particular to an energy storage system inter-cluster balancing device. The device uses a DCDC device to automatically balance the voltage and capacity between two clusters, which can eliminate inconsistencies between clusters, reduce system downtime, improve system throughput efficiency, improve reliability, avoid rework, and greatly reduce maintenance time and labor costs. It does not need to be shut down for maintenance and can be balanced online. The key technical points are online inter-cluster balancing and non-stop energy storage system maintenance.

Description

Technical Field

[0001] The utility model relates to the field of electrochemical battery systems, in particular to an inter-cluster balancing device for an energy storage system. Background Art

[0002] The industrial and commercial energy storage DC bus coupling system is a solution that connects multiple energy storage units through a DC bus to improve the flexibility and efficiency of the system. However, this system faces many technical problems in practical application.

[0003] Inconsistency between clusters: There may be differences in capacity, performance, charge and discharge rates between different energy storage units, leading to inconsistency between clusters. This may affect the overall performance and stability of the system; System downtime: Due to the complexity of the energy storage system, as well as possible technical failures or human operational errors, the system may experience downtime, resulting in production interruptions and data loss. Low throughput efficiency: The energy storage system may have energy conversion losses during the energy charging and discharging process, as well as energy losses related to inverters, converters and other equipment, which will affect the system's throughput efficiency and increase energy costs.

[0004] As one of the key energy infrastructures, the reliability of energy storage systems is crucial for industrial and commercial operations. However, due to technical reasons or design defects, energy storage systems may fail, affecting the reliability and stability of the system. Therefore, for industrial and commercial energy storage DC bus coupled systems, the device provided in this application can eliminate inconsistencies between clusters, reduce system downtime, improve system throughput efficiency, and improve reliability. Utility Model Content

[0005] The utility model provides an energy storage system inter-cluster balancing device, which can solve the problem of instability of industrial and commercial energy storage DC bus coupling system caused by inconsistency between clusters in the related technology. The technical solution is as follows:

[0006] Provided is an energy storage system inter-cluster balancing device, the device comprising a battery cluster 1#, a battery cluster 2#, a DCDC device, a balancing control module CBU and a switch S;

[0007] The battery cluster 1# and the battery cluster 2# are respectively connected to two ends of the DCDC device; the DCDC device is also connected to the balancing control module CBU;

[0008] The switch S is connected to the balancing control module CBU;

[0009] The DCDC device is used to control the current direction and voltage of the balancing control module CBU, and to detect the voltage difference between the input and output of the battery cluster 1# and the battery cluster 2#; the balancing control module CBU is used to balance the voltage between the battery cluster 1# and the battery cluster 2# under the connection relationship of the DCDC device.

[0010] Optionally, the switch S is manually triggered.

[0011] Optionally, the DCDC device is connected to the balancing control module CBU via a communication line group; the communication line group is a 485 communication line group or a CAN communication line group.

[0012] Optionally, the balancing control module CBU is used to control the battery cluster 2# to charge the battery cluster 1# under the connection relationship of the DCDC device when the voltage of the battery cluster 1# is lower than the voltage of the battery cluster 2#.

[0013] Optionally, the balancing control module CBU is used to control the battery cluster 1# to charge the battery cluster 2# under the connection relationship of the DCDC device when the voltage of the battery cluster 1# is higher than the voltage of the battery cluster 2#.

[0014] Optionally, the DCDC device is provided with a first connection end and a second connection end;

[0015] The anode end of the battery cluster 1# is connected to the anode end of the first connection end, and the cathode end of the battery cluster 1# is connected to the cathode end of the first connection end;

[0016] The anode end of the battery cluster 2# is connected to the anode end of the second connection end, and the cathode end of the battery cluster 2# is connected to the cathode end of the second connection end.

[0017] Optionally, the voltage range of the battery cluster 1# and the battery cluster 2# is between 1000V and 1500V.

[0018] Optionally, the battery cluster 1# and the battery cluster 2# are respectively composed of N PACKs connected in series, where N is a positive integer.

[0019] Optionally, the voltage range of each PACK is 600V-1000V.

[0020] Optionally, the switch S is provided with a switch loop.

[0021] The technical effects brought about by the energy storage system inter-cluster balancing device provided by the utility model are as follows.

[0022] Inter-cluster voltage balancing effect: By using the DCDC device and the balancing control module CBU, the voltage between battery clusters can be balanced. When there is a voltage inconsistency between battery clusters, the system can automatically or manually trigger the charging or discharging process to make the voltage between the two clusters consistent. This will help optimize the performance of the system and reduce the loss caused by imbalance between batteries.

[0023] Reduce system downtime: Since the system can achieve online inter-cluster voltage balancing during operation, there is no need to shut down for maintenance. Even if voltage inconsistency is found, operators can implement balancing control through manual triggering without interrupting system operation. This will significantly reduce system downtime and improve system availability and stability.

[0024] Improve system throughput efficiency: By keeping the voltage between battery clusters consistent, the capacity and performance of the energy storage system can be maximized. This avoids the situation where some battery clusters fail to function fully due to inconsistent voltage, thereby improving the energy utilization efficiency and throughput efficiency of the system.

[0025] Improve system reliability: Voltage balancing between battery clusters can not only improve system performance, but also reduce the risk of system failures caused by voltage inconsistency. By real-time monitoring and controlling the voltage between battery clusters, potential problems can be discovered and resolved in a timely manner, thereby improving system reliability and stability.

[0026] Reduce maintenance costs: Since the system can balance the voltage between clusters online without downtime for maintenance, it can reduce maintenance costs and labor costs. At the same time, it avoids frequent maintenance and replacement of battery clusters due to voltage inconsistency, further reducing maintenance costs.

[0027] In summary, the present application has significant technical effects, and can effectively solve the problems existing in industrial and commercial energy storage DC bus coupling systems, such as inconsistency between clusters, long system downtime, low throughput efficiency, and poor reliability. It can improve the performance and reliability of the system, reduce operating costs, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram showing the connection relationship of the DCDC control equalization device is shown;

[0029] Figure 2 A schematic diagram of the structure of an inter-cluster balancing device for an energy storage system is shown in an exemplary embodiment of the present application;

[0030] Figure 3 A schematic diagram of the structure of an inter-cluster balancing device for an energy storage system according to another exemplary embodiment of the present application is shown. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0032] The term "multiple" as used herein refers to two or more than two. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects are in an "or" relationship.

[0033] In the existing battery system, the voltage between clusters is inconsistent before leaving the factory and after operation, and the problematic battery pack needs to be removed, which is time-consuming and labor-intensive for secondary maintenance. Therefore, the device provided in this application uses a DCDC device to automatically balance the voltage and capacity between the two clusters, which can eliminate the inconsistency between clusters, reduce the downtime of the system, improve the throughput efficiency of the system, improve reliability, avoid rework, and greatly reduce the time and labor costs of maintenance. There is no need to shut down the system for maintenance, and online balancing can be performed. The key technical points are online cluster balancing and non-stop energy storage system maintenance.

[0034] like Figures 1 to 2 As shown, Figure 1 The connection diagram of the DCDC control equalization device is shown. Figure 2 A schematic diagram of the structure of an inter-cluster balancing device for an energy storage system according to an exemplary embodiment of the present application is shown.

[0035] First, the composition and connection relationship of the energy storage system inter-cluster balancing device are introduced. The device includes a energy storage system inter-cluster balancing device, which includes battery cluster 1#, battery cluster 2#, DCDC device, balancing control module CBU and switch S.

[0036] like Figure 1 and 2 As shown, battery cluster 1# and battery cluster 1# are connected to both ends of the DCDC device, respectively.

[0037] Further, such as Figure 2 As shown, the DCDC device is also connected to the balancing control module CBU. Figure 2 The switch S is connected to the balancing control module CBU; the DCDC device is used to control the current direction and voltage of the balancing control module CBU, and detect the voltage difference between the input and output of the battery cluster 1# and the battery cluster 2#; the balancing control module CBU is used to balance the voltage between the battery cluster 1# and the battery cluster 2# under the connection relationship of the DCDC device.

[0038] Furthermore, the switch S is manually triggered, and the switch S is provided with a switch circuit.

[0039] Furthermore, the DCDC device is connected to the balancing control module CBU via a communication line group, and the communication line group is a 485 communication line group or a CAN communication line group.

[0040] The balancing control module CBU is used to control the battery cluster 2# to charge the battery cluster 1# under the connection relationship of the DCDC device when the voltage of the battery cluster 1# is lower than the voltage of the battery cluster 2#.

[0041] The balancing control module CBU is used to control the battery cluster 1# to charge the battery cluster 2# under the connection relationship of the DCDC device when the voltage of the battery cluster 1# is higher than the voltage of the battery cluster 2#.

[0042] Furthermore, the DCDC device is provided with a first connection terminal and a second connection terminal. The anode terminal of battery cluster 1# is connected to the anode terminal of the first connection terminal, and the cathode terminal of battery cluster 1# is connected to the cathode terminal of the first connection terminal; the anode terminal of battery cluster 2# is connected to the anode terminal of the second connection terminal, and the cathode terminal of battery cluster 2# is connected to the cathode terminal of the second connection terminal.

[0043] Among them, the voltage range of battery cluster 1# and battery cluster 2# is between 1000V and 1500V.

[0044] Furthermore, Figure 3 A schematic diagram of the device structure of an inter-cluster balancing device for an energy storage system according to another exemplary embodiment of the present application is shown. Battery cluster 1# and battery cluster 2# are respectively composed of N PACKs connected in series, where N is a positive integer and the voltage range of each PACK is 600V-1000V.

[0045] In addition, if Figure 1 As shown, in describing the connection relationship of the DCDC device, if the balancing control module CBU is not connected, the switch S and its switch loop are set in the DCDC device.

[0046] In one embodiment, the balancing control strategy is described. The balancing control module CBU is connected to the DCDC device. When the voltage of battery cluster 1# is low and the voltage of battery cluster 1# is high, press the S switch, the DCDC device detects the voltage difference between the input and output, and communicates with the connected balancing control module CBU; controls the battery cluster 2# side to charge the battery cluster 1#; the charging current is set according to the rated charging current In. When the voltage of battery cluster 1# is high and the voltage of battery cluster 2# is low, press the S switch, the DCDC device detects the voltage difference between the input and output, and communicates with the balancing control module CBU, controls the battery cluster 1# side to charge the battery cluster 2#, and the charging current is set according to In.

[0047] In addition, the operating parameters of each structure of the device are supplemented.

[0048] Specific functions and parameters of the DCDC device: The DCDC device adopts an efficient converter design to achieve fast and accurate voltage balancing between battery clusters of different voltages and capacities.

[0049] Its operating parameters include a current control range of 0 to 50A and a voltage control range of 100V to 1500V, and it has the characteristics of fast response and high stability.

[0050] Working principle and algorithm of the balancing control module CBU: The balancing control module CBU adopts a dynamic balancing algorithm based on voltage difference, which can monitor the voltage difference between battery clusters in real time and adjust the charging and discharging strategy according to real-time data.

[0051] The module also has intelligent control functions that can automatically adjust the balancing strategy according to the status of the battery cluster and environmental conditions to maximize system performance.

[0052] Specific design and operation of switch S: Switch S adopts a manual triggering method and is located on the control panel of the system. The operator can manually trigger the balancing control by pressing a button.

[0053] The operation steps include: first, the operator observes the voltage difference between the battery clusters through the system monitoring interface; then, decides whether to manually trigger the balancing control according to the actual situation; finally, presses the switch S, and the system will operate according to the preset balancing strategy.

[0054] Function and connection method of the communication line group: The communication line group adopts CAN bus communication technology to realize data exchange and control signal transmission between the DCDC device and the balancing control module CBU.

[0055] These communication line groups are connected to the communication interfaces of the DCDC device and the balancing control module CBU through the connection interface module to ensure effective communication and data transmission between the various components of the system.

[0056] Safety protection measures: The system can also adopt multiple layers of safety protection measures, including overvoltage protection, overcurrent protection, overtemperature protection and other functions, to ensure that the system can take timely measures to protect the battery and equipment safety under abnormal conditions. When the system detects an abnormal situation, it will automatically trigger the protection mechanism, stop the charging and discharging process, and notify the operator through system alarms or automatic power off to prevent further damage to the equipment and battery.

[0057] By supplementing the above operating parameters, we can have a more comprehensive understanding of the technical details and operating methods of this application, and provide more reference and support for the design, implementation and operation of the system.

[0058] The technical effects brought about by the energy storage system inter-cluster balancing device provided by the utility model are as follows.

[0059] Inter-cluster voltage balancing effect: By using the DCDC device and the balancing control module CBU, the voltage between battery clusters can be balanced. When there is a voltage inconsistency between battery clusters, the system can automatically or manually trigger the charging or discharging process to make the voltage between the two clusters consistent. This will help optimize the performance of the system and reduce the loss caused by imbalance between batteries.

[0060] Reduce system downtime: Since the system can achieve online inter-cluster voltage balancing during operation, there is no need to shut down for maintenance. Even if voltage inconsistency is found, operators can implement balancing control through manual triggering without interrupting system operation. This will significantly reduce system downtime and improve system availability and stability.

[0061] Improve system throughput efficiency: By keeping the voltage between battery clusters consistent, the capacity and performance of the energy storage system can be maximized. This avoids the situation where some battery clusters fail to function fully due to inconsistent voltage, thereby improving the energy utilization efficiency and throughput efficiency of the system.

[0062] Improve system reliability: Voltage balancing between battery clusters can not only improve system performance, but also reduce the risk of system failures caused by voltage inconsistency. By real-time monitoring and controlling the voltage between battery clusters, potential problems can be discovered and resolved in a timely manner, thereby improving system reliability and stability.

[0063] Reduce maintenance costs: Since the system can balance the voltage between clusters online without downtime for maintenance, it can reduce maintenance costs and labor costs. At the same time, it avoids frequent maintenance and replacement of battery clusters due to voltage inconsistency, further reducing maintenance costs.

[0064] In summary, the present application has significant technical effects, and can effectively solve problems such as inter-cluster inconsistency, long system downtime, low throughput efficiency, and poor reliability in industrial and commercial energy storage DC bus coupling systems, improve system performance and reliability, and reduce operating costs, and has broad application prospects.

[0065] The above embodiments of the utility model are only for description and do not represent the advantages and disadvantages of the embodiments. The above are only optional embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An inter-cluster balancing device for an energy storage system, characterized in that: The device includes a battery cluster 1#, a battery cluster 2#, a DCDC device, a balancing control module CBU and a switch S; The battery cluster 1# and the battery cluster 2# are respectively connected to two ends of the DCDC device; the DCDC device is also connected to the balancing control module CBU; The switch S is connected to the balancing control module CBU; The DCDC device is used to control the current direction and voltage of the balancing control module CBU, and detect the voltage difference between the input and output of the battery cluster 1# and the battery cluster 2#; The balancing control module CBU is used to balance the voltage between the battery cluster 1# and the battery cluster 2# under the connection relationship of the DCDC device.

2. The energy storage system inter-cluster balancing device according to claim 1, characterized in that: The switch S is manually triggered.

3. The energy storage system inter-cluster balancing device according to claim 1, characterized in that: The DCDC device is connected to the balancing control module CBU via a communication line group; the communication line group is a 485 communication line group or a CAN communication line group.

4. The energy storage system inter-cluster balancing device according to claim 1, characterized in that: The balancing control module CBU is used to control the battery cluster 2# to charge the battery cluster 1# under the connection relationship of the DCDC device when the voltage of the battery cluster 1# is lower than the voltage of the battery cluster 2#.

5. The energy storage system inter-cluster balancing device according to claim 1, characterized in that: The balancing control module CBU is used to control the battery cluster 1# to charge the battery cluster 2# under the connection relationship of the DCDC device when the voltage of the battery cluster 1# is higher than the voltage of the battery cluster 2#.

6. The energy storage system inter-cluster balancing device according to claim 1, characterized in that: The DCDC device is provided with a first connection end and a second connection end; The anode end of the battery cluster 1# is connected to the anode end of the first connection end, and the cathode end of the battery cluster 1# is connected to the cathode end of the first connection end; The anode end of the battery cluster 2# is connected to the anode end of the second connection end, and the cathode end of the battery cluster 2# is connected to the cathode end of the second connection end.

7. The energy storage system inter-cluster balancing device according to claim 1, characterized in that: The voltage range of the battery cluster 1# and the battery cluster 2# is between 1000V and 1500V.

8. The energy storage system inter-cluster balancing device according to claim 1, characterized in that: The battery cluster 1# and the battery cluster 2# are respectively composed of N PACKs connected in series, where N is a positive integer.

9. The energy storage system inter-cluster balancing device according to claim 8, characterized in that: The voltage range of each PACK is 600V-1000V.

10. The energy storage system inter-cluster balancing device according to claim 8, characterized in that: The switch S is provided with a switch circuit.

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