Control circuit of two-in-one high-voltage box and high-voltage box

Abstract

The utility model belongs to the field of energy storage systems, and provides a control circuit of a two-in-one high-voltage box and the high-voltage box, and the control circuit comprises a first direct-current loop, a second direct-current loop, a first shunt relay, a second shunt relay, a first battery control unit, a second battery control unit, a first intermediate relay, a second intermediate relay and switch equipment. When the battery control unit detects that the corresponding direct-current loop has a fault, the corresponding connected shunt relay is controlled to be disconnected so as to isolate the fault loop; if the disconnection failure of the shunt relay is detected, the battery control unit controls the intermediate relay to realize the disconnection of the switch equipment so as to ensure that the fault circuit is thoroughly isolated. The control circuits of the two battery clusters are connected in parallel, the space occupancy rate of the high-voltage box is reduced, and the safety performance and the operation stability of the energy storage container are remarkably improved through a double fault cut-off protection mechanism.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of energy storage systems, and particularly relates to a control circuit of a two-in-one high-voltage box and the high-voltage box. BACKGROUND

[0002] As a core component of an energy storage system, a high-voltage box shoulders the key task of storing and releasing electric energy and ensuring safe operation of the system. However, traditional high-voltage boxes work independently, which not only occupies a large amount of space but also increases the complexity and cost of the system. With the increasing requirement of space utilization of the energy storage container, it is particularly urgent to reduce the volume of the high-voltage box. Based on this, the multi-in-one high-voltage box emerges as the times require, which significantly reduces the volume of the equipment and improves the space utilization, providing important support for the compact design of the energy storage system.

[0003] However, the multi-in-one high-voltage box still faces many challenges. Since the battery energy storage system is generally composed of multiple parallel battery clusters, when a single battery cluster circuit fails, the connection between the battery end and the load end is completely cut off, which will cause the entire energy storage container to stop running and cause unnecessary economic waste. CONTENT OF THE INVENTION

[0004] Therefore, the application provides a control circuit of a two-in-one high-voltage box and the high-voltage box to solve the above technical problems in the prior art, mainly comprising:

[0005] In a first aspect, the application provides a control circuit of a two-in-one high-voltage box, comprising:

[0006] A first DC circuit and a second DC circuit, the first DC circuit comprising a first shunt relay, the second DC circuit comprising a second shunt relay, and the first DC circuit and the second DC circuit being connected in parallel;

[0007] A first battery control unit and a second battery control unit, the first battery control unit being connected to the first shunt relay, and the second battery control unit being connected to the second shunt relay;

[0008] A first intermediate relay and a second intermediate relay, the first intermediate relay being connected to the first battery control unit, and the second intermediate relay being connected to the second battery control unit, and the first intermediate relay and the second intermediate relay being connected in parallel;

[0009] A switching device connected in parallel to the first intermediate relay and the second intermediate relay;

[0010] When the first battery control unit or the second battery control unit judges that the first DC circuit or the second DC circuit connected therewith fails, the corresponding connected first shunt relay or the second shunt relay is controlled to be opened; if the first battery control unit or the second battery control unit judges that the first shunt relay or the second shunt relay fails to be opened, the first battery control unit or the second battery control unit controls the switch device to be opened through the first intermediate relay or the second intermediate relay.

[0011] In some embodiments, the first controlled circuit of the first intermediate relay is connected in parallel with the first controlled circuit of the second intermediate relay.

[0012] In some embodiments, the switch device is provided with a split excitation release and auxiliary contacts, the split excitation release is connected in parallel with the first controlled circuit of the first intermediate relay and the first controlled circuit of the second intermediate relay.

[0013] The auxiliary contacts are connected with the first battery control unit.

[0014] In some embodiments, the second controlled circuit of the second intermediate relay is connected with the second battery control unit.

[0015] In some embodiments, the first shunt relay and the second shunt relay are provided with detection contacts, the detection contacts of the first shunt relay are connected with the first battery control unit, and the detection contacts of the second shunt relay are connected with the second battery control unit.

[0016] In some embodiments, the first DC circuit further comprises a first pre-charge circuit and a first main positive relay, the first pre-charge circuit is connected in parallel with the first main positive relay and in series with the first shunt relay.

[0017] The second DC circuit further comprises a second pre-charge circuit and a second main positive relay, the second pre-charge circuit is connected in parallel with the second main positive relay and in parallel with the second shunt relay.

[0018] In some embodiments, the first pre-charge circuit comprises a first pre-charge relay and a first pre-charge resistor, the first pre-charge relay and the first pre-charge resistor are connected in series.

[0019] The second pre-charge circuit comprises a second pre-charge relay and a second pre-charge resistor, the second pre-charge relay and the second pre-charge resistor are connected in series.

[0020] In some embodiments, the switch device is a circuit breaker or a load switch.

[0021] In some embodiments, the first intermediate relay and the second intermediate relay each have 8 pins.

[0022] In a second aspect, the embodiments of the present application provide a high-voltage box, comprising the control circuit of the two-in-one high-voltage box.

[0023] The beneficial effects achieved by the present application are as follows:

[0024] The present application relates to a control circuit of a two-in-one high-voltage box and a high-voltage box, which integrates the control circuits of two high-voltage boxes, significantly improving the space utilization of the energy storage container. Specifically, the high-voltage box comprises a first DC circuit, a second DC circuit, a first shunt relay, a second shunt relay, a first battery control unit, a second battery control unit, a first intermediate relay, a second intermediate relay, and a switching device. When the first battery control unit or the second battery control unit detects a fault in the first DC circuit or the second DC circuit connected thereto, it will control the first shunt relay or the second shunt relay to be disconnected, so as to only cut off the faulty circuit. If it is detected that the first shunt relay or the second shunt relay fails to be disconnected, the first battery control unit or the second battery control unit will further control the switching device to be disconnected through the first intermediate relay or the second intermediate relay, ensuring that the faulty circuit is completely isolated. Through the parallel design of the control circuits of the two battery clusters, the present application not only realizes the integration of the high-voltage box, but also significantly improves the safety performance and operational stability of the energy storage container through the double fault cut-off protection mechanism. This design effectively solves the problem of low space utilization caused by device redundancy in the traditional high-voltage box solution, and provides protection for the safe operation of the energy storage container.

[0025] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0027] Figure 1 The DC circuit of the present application is shown;

[0028] Figure 2 The AC circuit of the present application is shown.

[0029] In the figure, 1, first DC circuit; 2, second DC circuit; 110, first main positive fuse; 120, first main negative fuse; 130, first shunt; 140, first pre-charge resistor; 150, first pre-charge relay; 160, first main negative contactor; 170, first main positive relay; 180, switch device; 301, auxiliary contact; 302, auxiliary contact; 200, fan; 210, AC / DC switching power supply; 220, first intermediate relay; 230, second intermediate relay; 240, first battery control unit; 250, second battery control unit; 260, second main positive fuse; 270, second main negative fuse; 280, second shunt; 290, second pre-charge resistor; 300, second pre-charge relay; 310, second main negative contactor; 320, second main positive relay; 330, first shunt relay; 340, second shunt relay. DETAILED DESCRIPTION

[0030] The terms "comprise", "comprising", "contain", "containing", or "characterized by" in the specification and claims of this application and the said drawings are synonymous with "include", "including", or "comprise" and are inclusive or open-ended and do not exclude additional, unrecited elements or method steps. "Comprising" is a term of art that is used in the claims to mean existence of the stated elements or steps and allows the addition of further elements or steps without falling outside the scope of the claims.

[0031] It should be noted that similar reference numerals and letters in the following drawings represent similar items, and therefore, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings. In addition, the terms "first", "second", "third", etc. are used only to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

[0032] In the energy storage system, the high-voltage box as the core component undertakes the key task of electric energy storage, release and guaranteeing the safe operation of the system. The traditional high-voltage box adopts independent modular design, which occupies a large amount of space and is difficult to meet the requirement of high space utilization of the energy storage container. Therefore, the all-in-one high-voltage box becomes the mainstream, which improves the space utilization of the energy storage container. However, in the parallel circuit of multiple battery clusters, when a fault occurs in a certain battery cluster circuit, the all-in-one high-voltage box usually cuts off the power supply of all battery clusters, causing the normal working battery clusters to be forced to power off, which not only causes the system efficiency loss caused by a single battery cluster failure, but also causes the entire energy storage container to stop running, thereby causing unnecessary economic losses.

[0033] To solve this problem, the application provides a control circuit of a two-in-one high-voltage box and a high-voltage box.

[0034] With reference to the drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0035] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be combined with any of the other embodiments unless specifically noted otherwise.

[0036] With reference to Figure 1 and Figure 2 , the control circuit of the two-in-one high-voltage box in the embodiment comprises:

[0037] a first DC circuit 1 and a second DC circuit 2, the first DC circuit 1 comprising a first shunt relay 330, the second DC circuit 2 comprising a second shunt relay 340, the first DC circuit 1 and the second DC circuit 2 being connected in parallel;

[0038] a first battery control unit 240 and a second battery control unit 250, the first battery control unit 240 being connected to the first shunt relay 330, the second battery control unit 250 being connected to the second shunt relay 340;

[0039] a first intermediate relay 220 and a second intermediate relay 230, the first intermediate relay 220 being connected to the first battery control unit 240, the second intermediate relay 230 being connected to the second battery control unit 250, the first intermediate relay 220 and the second intermediate relay 230 being connected in parallel;

[0040] a switch device 180, the switch device 180 being connected in parallel to the first intermediate relay 220 and the second intermediate relay 230;

[0041] When the first battery control unit 240 or the second battery control unit 250 judges that the first direct current circuit 1 or the second direct current circuit 2 connected therewith fails, the corresponding first shunt relay 330 or the second shunt relay 340 is controlled to be disconnected; if the first battery control unit 240 or the second battery control unit 250 judges that the first shunt relay 330 or the second shunt relay 340 fails to be disconnected, the first battery control unit 240 or the second battery control unit 250 controls the switch device 180 to be disconnected through the first intermediate relay 220 or the second intermediate relay 230.

[0042] It should be noted that the battery clusters in the present application are connected in parallel, in order to ensure the voltage balance between the battery clusters and prevent overcurrent, short circuit and other faults from damaging the battery clusters. The battery clusters are respectively connected in series with the first direct current circuit 1 and the second direct current circuit 2, and the first direct current circuit 1 and the second direct current circuit 2 have the same connection structure. Specifically, the first direct current circuit 1 includes a first main positive contactor 110, a first pre-charge circuit, a first shunt relay 330, a first main negative relay 160, a first shunt 130 and a first main negative fuse 120. The second direct current circuit 2 includes a second main positive contactor 260, a second pre-charge circuit, a second shunt relay 340, a second main negative relay 310, a second shunt 280 and a second main negative fuse 270. The electrical elements are connected in series and connected with the battery clusters to form a circuit, and the electrical elements are respectively connected with the first battery control unit 240 and the second battery control unit 250.

[0043] During the battery cluster power supply process, if the first battery control unit 240 and the second battery control unit 250 detect that the electrical elements are stuck, the first battery control unit 240 and the second battery control unit 250 preferentially output a high-side signal to control the corresponding first shunt relay 330 and the second shunt relay 340 to be disconnected, thereby cutting off the direct current circuit corresponding to the faulty battery cluster, achieving the purpose of only disconnecting the power supply circuit of the faulty battery cluster without disconnecting the power supply circuit of the normal battery cluster. In this way, when the power supply circuit of a certain battery cluster is stuck, the operation of other battery clusters is not affected, effectively avoiding the loss of system efficiency caused by the failure of a single battery cluster, and improving the reliability and operation efficiency of the overall power supply system.

[0044] If the first battery control unit 240 and the second battery control unit 250 detect that the first shunt relay 330 and the second shunt relay 340 are not disconnected, the first battery control unit 240 and the second battery control unit 250 output high-side signals again to control the first intermediate relay 220 and the second intermediate relay 230 corresponding thereto to be attracted, thereby causing the switching device 180 to be disconnected. This provides a double protection mechanism for the battery cluster: the first battery control unit 240 or the second battery control unit 250 first detects the disconnection of the first shunt relay 330 or the second shunt relay 340, and according to the detection result, the first battery control unit 240 or the second battery control unit 250 controls the switching device 180 through the first intermediate relay 220 or the second intermediate relay 230 to realize the shutdown management of all battery clusters. The double protection strategy not only effectively isolates the fault, but also significantly improves the safety and reliability of the energy storage system, providing double protection for system operation.

[0045] In this embodiment, the first controlled circuit of the first intermediate relay 220 is connected in parallel with the first controlled circuit of the second intermediate relay 230.

[0046] It should be explained that the present application has an alternating current loop, which includes the fan 200, the AD / DC switching power supply 210, the first intermediate relay 220, the second intermediate relay 230, the first battery control unit 240, and the second battery control unit 250. Among them, the first intermediate relay 220 and the second intermediate relay 230 include a control circuit and a controlled circuit, and the controlled circuit includes a first controlled circuit and a second controlled circuit. The control circuit of the first intermediate relay 220 is connected with the first battery control unit 240, and the control circuit and the second controlled circuit of the second intermediate relay 230 are connected with the second battery control unit 250.

[0047] Specifically, the common end of the first controlled circuit of the first intermediate relay 220 is connected with the normally open end of the first controlled circuit of the second intermediate relay 230, and then connected with the L end of the AD / DC switching power supply 210; the normally open end of the first controlled circuit of the first intermediate relay 220 is connected with the common end of the second intermediate relay 230.

[0048] Further, the switching device 180 is provided with a split excitation release 301 and an auxiliary contact 302, the split excitation release 301 is connected in parallel with the first controlled circuit of the first intermediate relay 220 and the first controlled circuit of the second intermediate relay 230;

[0049] The auxiliary contact 302 is connected with the first battery control unit 240.

[0050] Specifically, one end of the split-trip breaker 301 is connected in parallel with the normally open end of the first controlled circuit of the first intermediate relay 220 and the common end of the first controlled circuit of the second intermediate relay 230, and the other end is connected with the N end of the AD / DC switching power supply 210.

[0051] Therefore, the AD / DC switching power supply 210, the first intermediate relay 220, the second intermediate relay 230, and the split-trip breaker 301 of the switching device 180 are connected to form two loops.

[0052] When the first battery control unit 240 or the second battery control unit 250 detects that the first shunt relay 330 or the second shunt relay 340 connected thereto is stuck, the first battery control unit 240 or the second battery control unit 250 outputs a high-level signal to the control circuit of the first intermediate relay 220 or the second intermediate relay 230 connected thereto, and the controlled circuit of the first intermediate relay 220 or the second intermediate relay 230 is attracted under the action of the control circuit, and then the loop formed by the AD / DC switching power supply 210, the first intermediate relay 220, the second intermediate relay 230, and the split-trip breaker 301 is turned on, and the switching device 180 is tripped under the action of the split-trip breaker 301. The first battery control unit 240 can determine the operating state of the switching device 180 through the signal of the auxiliary contact 302 of the switching device 180. The fan 200 can reduce the temperature of the high-voltage box during operation.

[0053] Further, the second controlled circuit of the second intermediate relay 230 is connected with the second battery control unit 250.

[0054] When the first control circuit of the second intermediate relay 230 is turned on, its second controlled circuit is also turned on at the same time, so the second battery control unit 250 can determine the on-off state of the switching device 180 through the signal of the second controlled circuit of the second intermediate relay 230.

[0055] In some embodiments, the first shunt relay 330 and the second shunt relay 340 are provided with detection contacts, the detection contacts of the first shunt relay 330 are connected with the first battery control unit 240, and the detection contacts of the second shunt relay 340 are connected with the second battery control unit 250.

[0056] The detection auxiliary contact is used to feed back the state of the first shunt relay 330 and the second shunt relay 340 to the first battery control unit 240 and the second battery control unit 250, preventing safety problems caused by sticking of the first shunt relay 330 and the second shunt relay 340. In addition, the detection auxiliary contact is provided for the electrical element, and in the process of detecting whether the electrical element sticks, on the basis of comparing the voltage detection point potential difference of the first battery control unit 240 and the second battery control unit 250 (which belongs to the prior art and is not described in detail), in combination with the signal fed back by the auxiliary contact of the electrical element, the first battery control unit 240 and the second battery control unit 250 further determine the electrical element that sticks. The first battery control unit 240 or the second battery control unit 250 detects any abnormal electrical element, which can trigger the protection mechanism.

[0057] In some embodiments, the first direct current circuit 1 further comprises a first pre-charge circuit and a first main positive relay 170, and the first pre-charge circuit is connected in parallel with the first main positive relay 170 and connected in series with the first shunt relay 330.

[0058] The second direct current circuit 2 further comprises a second pre-charge circuit and a second main positive relay 320, and the second pre-charge circuit is connected in parallel with the second main positive relay 320 and connected in parallel with the second shunt relay 340.

[0059] In the case of parallel connection of multiple battery clusters, if there is a voltage difference between the battery clusters, a circulating current will be formed. The circulating current will cause energy imbalance between the battery clusters and increase the loss of the system. In order to avoid this situation, a pre-charge circuit needs to be added between the positive and negative electrodes of each battery cluster to ensure that the voltages of the battery clusters are consistent. The first pre-charge circuit comprises a first pre-charge relay 150 and a first pre-charge resistor 140, and the first pre-charge relay 150 and the first pre-charge resistor 140 are connected in series; the second pre-charge circuit comprises a second pre-charge relay 300 and a second pre-charge resistor 290, and the second pre-charge relay 300 and the second pre-charge resistor 290 are connected in series.

[0060] When the battery clusters are powered, if the voltage difference between the battery clusters is within a set value range, the first pre-charge relay 150 or the second pre-charge relay 300 is closed to make the first pre-charge circuit or the second pre-charge circuit conductive, at this time, the battery cluster with a higher total voltage discharges through the pre-charge circuit with a small current to achieve the purpose of balancing the voltage between the battery clusters.

[0061] In some embodiments, the switch device 180 is a circuit breaker or a load switch.

[0062] In the embodiment, the first intermediate relay 220 and the second intermediate relay 230 are respectively 8 pins.

[0063] The application further provides a high-voltage box comprising the control circuit of the two-in-one high-voltage box.

[0064] The above has carried out the detailed introduction to the embodiment of the application, the principle and implementation mode of the application have been described in this paper by applying specific examples, the above embodiment explanation is only used for helping understanding the method of the application and its core idea; at the same time, for the general technical personnel in the art, according to the idea of the application, the specific implementation mode and application range will have the change, and the above-mentioned, the content of the specification should not be understood as the limitation of the application.

Claims

1. A control circuit for a two-in-one high voltage box, characterized in that, The application relates to a battery management system, comprising: a first DC circuit (1) comprising a first shunt relay (330) and a second DC circuit (2) comprising a second shunt relay (340), the first DC circuit (1) and the second DC circuit (2) being connected in parallel; a first battery control unit (240) connected to the first shunt relay (330) and a second battery control unit (250) connected to the second shunt relay (340); a first intermediate relay (220) connected to the first battery control unit (240) and a second intermediate relay (230) connected to the second battery control unit (250), the first intermediate relay (220) and the second intermediate relay (230) being connected in parallel; a switching device (180) connected in parallel to the first intermediate relay (220) and the second intermediate relay (230); when the first battery control unit (240) or the second battery control unit (250) detects a fault in the first DC circuit (1) or the second DC circuit (2) connected thereto, the corresponding first shunt relay (330) or the second shunt relay (340) is controlled to be disconnected; if the first battery control unit (240) or the second battery control unit (250) fails to disconnect the first shunt relay (330) or the second shunt relay (340), the first battery control unit (240) or the second battery control unit (250) controls the switching device (180) to be disconnected through the first intermediate relay (220) or the second intermediate relay (230).

2. The control circuit of a two-in-one high voltage box according to claim 1, wherein, A first controlled circuit of the first intermediate relay (220) is connected in parallel to a first controlled circuit of the second intermediate relay (230).

3. The control circuit of a two-in-one high voltage box according to claim 1, wherein, The switching device (180) is provided with a split excitation release (301) and auxiliary contacts (302), the split excitation release (301) being connected in parallel to a first controlled circuit of the first intermediate relay (220) and a first controlled circuit of the second intermediate relay (230); the auxiliary contacts (302) being connected to the first battery control unit (240).

4. The control circuit of a two-in-one high voltage box according to claim 3, wherein, A second controlled circuit of the second intermediate relay (230) is connected to the second battery control unit (250).

5. The control circuit of a two-in-one high voltage box of claim 1, wherein, The first shunt relay (330) and the second shunt relay (340) are provided with detection contacts, the detection contacts of the first shunt relay (330) being connected to the first battery control unit (240), and the detection contacts of the second shunt relay (340) being connected to the second battery control unit (250).

6. The control circuit of a two-in-one high voltage box of claim 1, wherein, The first DC circuit (1) further comprises a first pre-charge circuit and a first main positive relay (170), the first pre-charge circuit being connected in parallel with the first main positive relay (170) and in series with the first shunt relay (330); The second DC circuit (2) further comprises a second pre-charge circuit and a second main positive relay (320), the second pre-charge circuit being connected in parallel with the second main positive relay (320) and in parallel with the second shunt relay (340).

7. A control circuit for a two-in-one high voltage box according to claim 6, wherein, The first pre-charge circuit comprises a first pre-charge relay (150) and a first pre-charge resistor (140), the first pre-charge relay (150) and the first pre-charge resistor (140) being connected in series; The second pre-charge circuit comprises a second pre-charge relay (300) and a second pre-charge resistor (290), the second pre-charge relay (300) and the second pre-charge resistor (290) being connected in series.

8. The control circuit of a two-in-one high voltage box of claim 1, wherein, The switch device (180) is a circuit breaker or a load switch.

9. The control circuit of a two-in-one high voltage box of claim 1, wherein, The first intermediate relay (220) and the second intermediate relay (230) each have 8 pins.

10. A high voltage box characterized by, A control circuit of a two-in-one high-voltage box comprising any one of claims 1-9.

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