Inter-cluster active balancing device for energy storage

Abstract

The inter-cluster active equalization device for energy storage comprises a controller and a plurality of equalization modules, the controller is connected with the equalization modules, the equalization modules are connected with a confluence cabinet and battery clusters, each equalization module comprises a detection module, an equalization bridge and a driving circuit, and the detection module is connected with the equalization bridge. The detection module is used for detecting the voltage of the equalization bridge and sending the voltage to the controller, and the controller judges that the corresponding battery cluster needs to be equalized according to the voltage so as to control the driving circuit to drive the on and off of the equalization bridge; the detection module is arranged to detect the voltage of the circuit so as to judge whether the voltage of the battery cluster needs to be balanced, the controller controls the driving circuit to drive the on and off of the balancing bridge so as to adjust the voltage of the battery cluster, the voltage of the battery cluster is balanced, inter-cluster ring current is inhibited, the structure is simple, and the cost is low.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage systems, and more particularly, to an active inter-cluster equalization device for energy storage. Background Art

[0002] A battery pack generally consists of battery modules, a thermal management system, a battery management system (BMS), an electrical system, and a structural member, where the battery module is composed of multiple battery cells; the existing battery system for energy storage generally uses the BMS as a way to achieve battery equalization, but this method has a complex structure, and at the same time, a circulating current will be formed between battery clusters. Summary of the Invention

[0003] The purpose of the embodiments of the present application is to provide an active inter-cluster equalization device for energy storage, so as to solve the problems in the prior art that the battery equalization method has a complex structure and a circulating current will be formed between battery clusters.

[0004] The embodiments of the present application provide an active inter-cluster equalization device for energy storage, including: a controller and a plurality of equalization modules. The controller is connected to the equalization modules, and the equalization modules are connected to a busbar cabinet and battery clusters. The equalization module includes a detection module, an equalization bridge, and a drive circuit. The detection module is used to detect the voltage of the equalization bridge and send it to the controller. The controller determines whether the corresponding battery cluster needs to be equalized according to this voltage, so as to control the drive circuit to drive the conduction and cut-off of the equalization bridge.

[0005] Further, the equalization bridge includes a first MOS transistor, a second MOS transistor, a first diode, and a second diode; the gate of the first MOS transistor is connected to the drive circuit, the collector is connected to the positive electrode of the first diode, and the emitter is connected to the battery cluster; the gate of the second MOS transistor is connected to the drive circuit, the collector is connected to the negative electrode of the second diode, and the emitter is connected to the battery cluster; the negative electrode of the first diode and the positive electrode of the second diode are connected to the busbar cabinet.

[0006] Further, the first MOS transistor and the first diode form a first half-bridge.

[0007] Further, the second MOS transistor and the second diode form a second half-bridge.

[0008] Further, the drive circuit outputs a +15V voltage to the gate of the first MOS transistor, and the first MOS transistor conducts.

[0009] Further, the drive circuit outputs a -5V voltage to the gate of the first MOS transistor, and the first MOS transistor cuts off.

[0010] Further, the drive circuit outputs a +15V voltage to the gate of the second MOS transistor, and the second MOS transistor conducts.

[0011] Further, the drive circuit outputs a -5V voltage to the gate of the second MOS transistor, and the second MOS transistor cuts off.

[0012] Further, the controller is connected to the equalization module through a communication optical fiber.

[0013] Further, the controller adopts an EMS control system.

[0014] As described above, in the embodiment of the present application, the detection module is provided to detect the voltage of the circuit, so as to judge whether the voltage of the battery cluster needs to be equalized. The controller controls the drive circuit to drive the conduction and closing of the equalization bridge to adjust the voltage of the battery cluster, realizing the equalization of the voltage of the battery cluster and suppressing the inter-cluster circulating current at the same time. The structure is simple and the cost is low. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a schematic structural diagram of an inter-cluster active equalization device for energy storage provided by an embodiment of the present application;

[0017] Figure 2 It is a schematic structural diagram of an equalization module of an inter-cluster active equalization device for energy storage provided by an embodiment of the present application;

[0018] Reference numerals: 10, controller; 20, equalization module; 21, drive circuit; 22, first half-bridge; 23, second half-bridge. Detailed Embodiments

[0019] The following will describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application.

[0020] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present application, the terms "first", "second", etc. are only used for differential description and cannot be understood as indicating or implying relative importance.

[0021] Please refer to Figure 1 ,Figure 1 The figure is a schematic structural diagram of an inter-cluster active equalization device for energy storage provided by an embodiment of the present application. Please refer to Figure 1 and Figure 2 , the inter-cluster active equalization device for energy storage includes a controller 10 and a plurality of equalization modules 20. The controller 10 is connected to the equalization modules 20. The equalization modules 20 are connected to a busbar cabinet and battery clusters. The equalization module 20 includes a detection module, an equalization bridge, and a drive circuit 21. The detection module is used to detect the voltage of the equalization bridge and send it to the controller 10. The controller 10 determines whether the corresponding battery cluster needs equalization based on this voltage, so as to control the drive circuit 21 to drive the conduction and cut-off of the equalization bridge.

[0022] It can be understood that there are multiple equalization modules 20. The controller 10 determines which battery cluster needs equalization voltage difference by cyclically collecting the voltages before and after each bridge in the equalization module 20.

[0023] In the above, in the embodiment of the present application, the detection module is set to detect the voltage of the circuit, so as to judge whether the voltage of the battery cluster needs to be equalized. The controller 10 controls the drive circuit 21 to drive the conduction and cut-off of the equalization bridge to adjust the voltage of the battery cluster, realizing the equalization of the voltage of the battery cluster, while suppressing the inter-cluster circulating current. The structure is simple and the cost is low.

[0024] In some embodiments, the equalization bridge includes a first MOS transistor, a second MOS transistor, a first diode, and a second diode; the gate of the first MOS transistor is connected to the drive circuit 21, the collector is connected to the positive electrode of the first diode, and the emitter is connected to the battery cluster; the gate of the second MOS transistor is connected to the drive circuit 21, the collector is connected to the negative electrode of the second diode, and the emitter is connected to the battery cluster; the negative electrode of the first diode and the positive electrode of the second diode are connected to the busbar cabinet.

[0025] In some embodiments, the combination of the first MOS transistor and the first diode forms a first half-bridge 22; the combination of the second MOS transistor and the second diode forms a second half-bridge 23.

[0026] Optionally, the drive circuit 21 outputs a +15V voltage to the gate of the first MOS transistor, and the first MOS transistor conducts; the drive circuit 21 outputs a -5V voltage to the gate of the first MOS transistor, and the first MOS transistor cuts off.

[0027] Optionally, the drive circuit 21 outputs a +15V voltage to the gate of the second MOS transistor, and the second MOS transistor conducts; the drive circuit 21 outputs a -5V voltage to the gate of the second MOS transistor, and the second MOS transistor cuts off.

[0028] Specifically, the controller 10 calculates the average value of the voltages of each battery cluster when it is stationary as the standard voltage. For the battery clusters with voltages lower than the standard voltage, the second half-bridge 23 of the equalization device is preferentially turned on during charging; after the voltage of the battery cluster is higher than the standard voltage, the first half-bridge 22 is turned on. During discharging, the first half-bridge 22 of the equalization device is preferentially turned on; after the voltage of the battery cluster is lower than the standard voltage, the second half-bridge 23 is turned on.

[0029] It should be noted that there are many existing implementation means for the controller to determine whether the voltage of the equalization circuit (the voltage of the battery cluster) exceeds the standard voltage and thus send a control signal to the drive circuit. The embodiments of the present application do not limit this.

[0030] In some embodiments, the controller 10 is connected to the equalization module 20 through a communication optical fiber.

[0031] In some embodiments, the controller 10 adopts an EMS control system.

[0032] The above are only the embodiments of the present application and are not used to limit the protection scope of the present application. For those skilled in the art, the present application can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0033] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, and all should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0034] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, the element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including the said element.

Claims

1. An active inter-cluster balancing device for energy storage, characterized in that: include: A controller and several balancing modules, wherein the controller is connected to the balancing modules, and the balancing modules are connected to the combiner cabinet and the battery cluster. The balancing module includes a detection module, a balancing bridge and a drive circuit. The detection module is used to detect the voltage of the balancing bridge and send it to the controller. The controller determines that the corresponding battery cluster needs to be balanced according to the voltage, so as to control the drive circuit to drive the balancing bridge to be turned on and off.

2. The active inter-cluster balancing device for energy storage according to claim 1, characterized in that: The balancing bridge includes a first MOS tube, a second MOS tube, a first diode and a second diode; the gate of the first MOS tube is connected to the driving circuit, the collector is connected to the anode of the first diode, and the emitter is connected to the battery cluster; the gate of the second MOS tube is connected to the driving circuit, the collector is connected to the cathode of the second diode, and the emitter is connected to the battery cluster; the cathode of the first diode and the anode of the second diode are connected to the combiner cabinet.

3. The active inter-cluster balancing device for energy storage according to claim 2, characterized in that: The first MOS tube and the first diode are combined to form a first half bridge.

4. The active inter-cluster balancing device for energy storage according to claim 2, characterized in that: The second MOS tube and the second diode are combined to form a second half bridge.

5. The active inter-cluster balancing device for energy storage according to claim 3, characterized in that: The driving circuit outputs a +15V voltage to the gate of the first MOS transistor, and the first MOS transistor is turned on.

6. The active inter-cluster balancing device for energy storage according to claim 3, characterized in that: The driving circuit outputs a -5V voltage to the gate of the first MOS transistor, and the first MOS transistor is turned off.

7. The active inter-cluster balancing device for energy storage according to claim 4, characterized in that: The driving circuit outputs a +15V voltage to the gate of the second MOS tube, and the second MOS tube is turned on.

8. The active inter-cluster balancing device for energy storage according to claim 4, characterized in that: The driving circuit outputs a -5V voltage to the gate of the second MOS transistor, and the second MOS transistor is turned off.

9. The active inter-cluster balancing device for energy storage according to claim 1, characterized in that: The controller is connected to the balancing module via a communication optical fiber.

10. The active inter-cluster balancing device for energy storage according to claim 1, characterized in that: The controller adopts an EMS control system.

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