Energy storage high-voltage box, energy storage system and energy storage power station

Abstract

The utility model provides an energy storage high-voltage box, an energy storage system and an energy storage power station, and the energy storage high-voltage box comprises a BMS main control module and a circuit breaker connected to a power utilization circuit. The power utilization circuit comprises a main loop and a pre-charging loop connected with the main loop in parallel; the circuit breaker is connected with the BMS main control module, and the circuit breaker comprises a first switch module connected in series to the main circuit and a second switch module connected in series to the pre-charging circuit. According to the energy storage high-voltage box of the utility model, the use of electric devices can be reduced, the cost can be reduced, the structural layout of the high-voltage box can be improved, and the miniaturization design of the high-voltage box can be realized, thereby facilitating the cost reduction and integrated design of an energy storage system.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage equipment, and in particular to an energy storage high-voltage box. At the same time, the utility model also relates to an energy storage system provided with the energy storage high-voltage box, and an energy storage power station provided with the energy storage system. Background Art

[0002] In existing energy storage battery clusters, each cluster is adapted to a high-voltage box. The high-voltage box usually contains multiple electrical components such as a power input interface, a power output interface, a communication power supply interface, a current monitoring interface, several contactors, a battery management main control board, a handle-type isolating switch, and protective device fuses. The production cost is high, and the box is large in size and occupies a large area, which is not conducive to cost reduction and integrated design of the energy storage system. Utility Model Content

[0003] In view of this, the present invention aims to provide an energy storage high-voltage box to achieve cost reduction and miniaturization design.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0005] An energy storage high-voltage box includes a BMS main control module and a circuit breaker connected to a power circuit;

[0006] The power circuit includes a main circuit and a pre-charge circuit connected in parallel with the main circuit;

[0007] The circuit breaker is connected to the BMS main control module, and the circuit breaker includes a first switch module connected in series to the main circuit, and a second switch module connected in series to the pre-charging circuit.

[0008] Furthermore, the main circuit includes a positive circuit connecting the positive output pole of the battery box and the positive pole of the load, and a negative circuit connecting the negative output pole of the battery box and the negative pole of the load; the first switch module includes a first sub-switch and a second sub-switch set in linkage, the first sub-switch is connected in series to the positive circuit, and the second sub-switch is connected in series to the negative circuit.

[0009] Furthermore, the pre-charge circuit includes a pre-charge positive circuit connected in parallel to the positive circuit, and a pre-charge negative circuit connected in parallel to the negative circuit; the second switch module includes a third sub-switch and a fourth sub-switch arranged in linkage, the third sub-switch is connected in series to the pre-charge positive circuit, and the fourth sub-switch is connected in series to the pre-charge negative circuit.

[0010] Furthermore, a balancing resistor is connected in series to the pre-charge positive circuit, a first end of the balancing resistor is connected to the positive output electrode of the battery box and the first end of the first sub-switch, and a second end of the balancing resistor is connected to the positive electrode of the load and the second end of the first sub-switch.

[0011] Furthermore, a current detection unit is connected to the negative pole circuit, and the current detection unit is connected to the BMS main control module; and / or a fuse is connected in series to the positive pole circuit, the first end of the fuse is connected to the positive output pole of the battery box, and the second end of the fuse is connected to the first end of the first sub-switch.

[0012] Furthermore, the circuit breaker has a feedback switch module connected to the BMS main control module, and the feedback switch module is used to feed back the contact status of the circuit breaker to the BMS main control module.

[0013] Furthermore, the rated voltage of the circuit breaker is 2500V.

[0014] Furthermore, it also includes a power supply module, and the BMS main control module is connected to the power supply module; and / or the BMS main control module is provided with a network interface for communicating with external devices.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] The energy storage high-voltage box described in the utility model replaces the main positive relay, main negative relay and pre-charge contactor in the traditional technology by integrating a circuit breaker with a first switch module and a second switch module. At the same time, it can also save the copper busbars used for connecting various electrical components, which can reduce the use of electrical components and reduce costs. It is also beneficial to improve the structural layout of the high-voltage box, reduce the area occupied by the high-voltage box, and realize miniaturization design, thereby facilitating cost reduction and integrated design of the energy storage system.

[0017] Furthermore, by setting a balancing resistor, a current limiting function can be achieved, which helps to equalize the voltage between different battery clusters. The setting of the current detection unit can detect the usage status of the power circuit, which facilitates the BMS main control module to switch the control circuit between different working states. By setting a fuse, the safe operation of the circuit can be protected, overload current, short-circuit current, and fault current can be limited, thereby avoiding safety accidents such as damage to the high-voltage box or fire. The feedback switch module is integrated in the circuit breaker, which helps the BMS main control module detect and control the contact status of the circuit breaker main circuit. The rated voltage of the circuit breaker is 2500V, which helps to meet the design requirements of high-level platforms.

[0018] In addition, another object of the present invention is to provide an energy storage system, in which the energy storage high-voltage box as described above is provided.

[0019] In addition, another object of the present invention is to provide an energy storage power station, which includes the above-mentioned energy storage system.

[0020] The energy storage system, energy storage power station and the above-mentioned energy storage high-voltage box described in the utility model have the same beneficial effects as traditional technologies, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 This is a circuit diagram of the energy storage high-voltage box according to an embodiment of the present utility model;

[0023] Figure 2 This is a control principle diagram of the first switch module in the circuit breaker according to an embodiment of the present utility model;

[0024] Figure 3 This is a control principle diagram of the second switch module in the circuit breaker according to an embodiment of the present utility model;

[0025] Description of reference numerals:

[0026] 1. Power circuit; 11. Positive circuit; 12. Negative circuit; 13. Pre-charge positive circuit; 14. Pre-charge negative circuit;

[0027] 2. Circuit breaker; 21. First sub-switch; 22. Second sub-switch; 23. Third sub-switch; 24. Fourth sub-switch; 25. Feedback switch module; 26. Main circuit coil; 27. Pre-charge circuit coil;

[0028] 3. BMS main control module; 4. Equalizing resistor; 5. Current detection unit; 6. Fuse; 7. Power supply module; 8. Network interface;

[0029] B+, battery box output positive pole; B-, battery box output negative pole; P+, load positive pole; P-, load negative pole. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0031] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," and "outer" appear to indicate orientation or positional relationships, these are based on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, if terms such as "first" and "second" appear, they are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0032] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "mounted," "connected," "connection," and "connector" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0033] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0034] Example 1

[0035] This embodiment relates to an energy storage high-voltage box, which has better cost advantages and is smaller in size, thereby helping to reduce the production cost of battery clusters and promote the integration and miniaturization of battery clusters.

[0036] In terms of overall structure, Figure 1 As shown, the energy storage high-voltage box of this embodiment includes a BMS main control module 3 and a circuit breaker 2 connected to a power circuit 1. Furthermore, the power circuit 1 includes a main circuit and a pre-charge circuit connected in parallel with the main circuit. The circuit breaker 2 is connected to the BMS main control module 3 and includes a first switch module connected in series with the main circuit and a second switch module connected in series with the pre-charge circuit.

[0037] At this time, as set above, the circuit breaker 2 integrated with the first switch module and the second switch module can replace the functions of the main positive relay, the main negative relay and the pre-charge contactor in the traditional technology. At the same time, it can also save the copper busbars used for connection between the electrical components, so as to reduce the use of electrical components, reduce costs, and help improve the structural layout of the high-voltage box, reduce the area occupied by the high-voltage box, and realize miniaturized design.

[0038] Based on the above overall introduction, in this embodiment, the energy storage high-voltage box of this embodiment is particularly suitable for use in battery clusters, and the battery cluster has a battery box. The energy storage high-voltage box is connected to the battery box and manages the reception, storage, and distribution of high-voltage direct current in the battery cluster. At the same time, the BMS main control module 3 of this embodiment is a core component of the battery management system (BMS), responsible for monitoring and controlling the performance of the battery system. The specific structure of the BMS main control module 3 here can refer to the relevant structure of the battery management system commonly known to those skilled in the art.

[0039] In this embodiment, Figure 1 As shown in the figure, as a preferred embodiment, the main circuit includes a positive circuit 11 connecting the battery box output positive terminal B+ with the load positive terminal P+, and a negative circuit 12 connecting the battery box output negative terminal B- with the load negative terminal P-. Furthermore, the first switch module includes a first sub-switch 21 and a second sub-switch 22, which are arranged in a linked manner. The first sub-switch 21 is connected in series to the positive circuit 11, and the second sub-switch 22 is connected in series to the negative circuit 12. With this arrangement, the first switch module of the circuit breaker 2 can replace the traditional main positive and negative contactors.

[0040] In specific implementation, in this embodiment, as a preferred implementation form, the pre-charge circuit includes a pre-charge positive circuit 13 connected in parallel to the positive circuit 11, and a pre-charge negative circuit 14 connected in parallel to the negative circuit 12. Furthermore, the second switch module includes a third sub-switch 23 and a fourth sub-switch 24 that are arranged in a linked manner. The third sub-switch 23 is connected in series to the pre-charge positive circuit 13, and the fourth sub-switch 24 is connected in series to the pre-charge negative circuit 14.

[0041] Thus, the pre-charge contactor can be replaced by the second switch module, and since the second switch module and the first switch module are integrated into the circuit breaker 2, the use of electrical components and space occupation can be reduced. Figure 1 As shown, as a preferred embodiment, a balancing resistor 4 is connected in series to the pre-charge positive circuit 13, the first end of the balancing resistor 4 is connected to the battery box output positive electrode B+ and the first end of the first sub-switch 21, and the second end of the balancing resistor 4 is connected to the load positive electrode P+ and the second end of the first sub-switch 21.

[0042] It is understood that by setting the balancing resistor 4, a current limiting effect can be achieved, which is conducive to balancing the voltages between different battery clusters. In specific implementation, the specifications of the balancing resistor 4 can be preferably set to 2Ω and 200W to achieve better balancing effect.

[0043] Furthermore, as a preferred implementation form, a current detection unit 5 is connected to the negative circuit 12 of this embodiment, and the current detection unit 5 is connected to the BMS main control module 3 to detect the usage status of the power circuit 1, so as to facilitate the BMS main control module 3 to control the circuit to switch between different working states.

[0044] The above-mentioned current detection unit 5 can adopt a current sensor with CAN communication, thereby transmitting the current signal to the BMS main control module 3 through CAN communication, achieving faster detection and transmission to the BMS main control module 3, and facilitating the battery management system to quickly process the circuit situation.

[0045] At the same time, and also as a preferred embodiment, a fuse 6 is connected in series with the positive electrode circuit 11 of this embodiment. The first end of the fuse 6 is connected to the positive output electrode B+ of the battery box, and the second end of the fuse 6 is connected to the first end of the first sub-switch 21. The provision of the fuse 6 can protect the safe operation of the circuit, prevent overload current and short-circuit current, and limit fault current, thereby preventing safety accidents such as damage to the high-voltage box or fire.

[0046] In addition, in this embodiment, as a preferred implementation form, the circuit breaker 2 includes a feedback switch module 25 connected to the BMS main control module 3. The feedback switch module 25 is used to feedback the contact status of the circuit breaker 2 to the BMS main control module 3. Here, by integrating the feedback switch module 25 in the circuit breaker 2, the BMS main control module 3 is facilitated to detect and control the contact status of the main circuit of the circuit breaker 2.

[0047] It is worth noting that the relevant structural parts not mentioned in the circuit breaker 2 of this embodiment can refer to circuit breaker products well known to those skilled in the art, such as DC molded case circuit breaker 2. Figure 2 and Figure 3 From the above, it can be seen that the circuit breaker 2 of this embodiment is provided with a main circuit coil 26 and a pre-charge circuit coil 27 for respectively operating the opening and closing of the first switch module and the second switch module. The main circuit coil 26 and the pre-charge circuit coil 27 are mainly based on the control of the BMS main control module 3 to perform the operation of the first switch module and the second switch module, and the above-mentioned feedback switch module 25 includes a feedback switch integrated in the feedback circuit of the circuit breaker 2. The feedback circuit is also connected to the BMS main control module 3 to accept the control of the BMS main control module 3 to realize the opening and closing of the feedback switch, etc., which can all refer to common circuit breaker products and their usage principles.

[0048] Furthermore, to meet the design requirements of a high-level platform, in this embodiment, as a preferred implementation form, the rated voltage of the circuit breaker 2 is 2500 V, and the rated operating current is 300 A. Specifically, technical means well known to those skilled in the art can be used to enable the circuit breaker 2 to meet the requirements of a rated voltage of 2500 V and a rated operating current of 300 A, such as increasing the creepage distance of the circuit breaker 2 (i.e., increasing the distance between the positive and negative external poles of the circuit breaker 2), and increasing the electrical clearance and creepage distance inside the high-voltage box to meet the DC requirements of 2500 V and 300 A.

[0049] In addition, in this embodiment, see again Figure 1 As shown, as a preferred implementation form, the energy storage high-voltage box of this embodiment also includes a power supply module 7, and the BMS main control module 3 is connected to the power supply module 7 to meet the power supply requirements of the BMS main control module 3. In specific implementation, the power supply module 7 can adopt a 24V DC power supply and supply power to the current detection unit 5.

[0050] Based on communication requirements, in this embodiment, as a preferred implementation form, the BMS main control module 3 is provided with a network interface 8 for communicating with external devices. The network interface 8 can preferably be an interface product that meets IP54 requirements to ensure sufficient waterproof and dustproof performance.

[0051] The circuit breaker 2 of this embodiment meets the 2500V, 300A DC requirements by increasing its internal creepage distance and increasing the electrical clearance and creepage distance within the high-voltage box. It not only performs the basic functions of the circuit breaker 2, namely thermal overload protection, short-circuit quick-break protection, and load disconnection, but also integrates the functions of multiple contactors. When the battery cluster is powered on, the switch module (first or second) in the circuit breaker 2 is first closed. The circuit is then current-limited by equalizing resistor 4, gradually equalizing the voltage between different clusters. When the voltage difference between the battery clusters is within 10V (resistance proportionality), the switch module in the main circuit of the circuit breaker 2 is directly closed under the control of the BMS main control module 3. When the BMS main control module 3 detects a serious fault, it can directly control the circuit breaker 2 to open, effectively disconnecting the DC circuit. The circuit breaker 2 also includes a feedback switch module 25, which facilitates the BMS main control module 3 to detect the contact status of the circuit breaker 2.

[0052] The energy storage high-voltage box of this embodiment replaces the main positive relay, main negative relay and pre-charge contactor in the traditional technology by integrating the circuit breaker 2 with the first switch module and the second switch module. At the same time, it can also save the copper busbars used for connecting various electrical components, which can reduce the use of electrical components and reduce costs. It is also beneficial to improve the structural layout of the high-voltage box, reduce the area occupied by the high-voltage box, and realize miniaturization design, thereby facilitating cost reduction and integrated design of the energy storage system.

[0053] Example 2

[0054] This embodiment relates to an energy storage system, in which the energy storage high-voltage box in embodiment 1 is provided. At the same time, this embodiment also relates to an energy storage power station, which includes the above-mentioned energy storage system.

[0055] The energy storage system and energy storage power station of this embodiment, by providing the energy storage high-voltage box of Example 1, can reduce the use of electrical components, reduce costs, and reduce the area occupied by the high-voltage box, thereby achieving a miniaturized design, thereby facilitating cost reduction and integrated design of the energy storage system and energy storage power station.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An energy storage high-voltage box, characterized in that: It includes a BMS main control module and a circuit breaker connected to the power circuit; The power circuit includes a main circuit and a pre-charge circuit connected in parallel with the main circuit; The circuit breaker is connected to the BMS main control module, and the circuit breaker includes a first switch module connected in series to the main circuit, and a second switch module connected in series to the pre-charging circuit.

2. The energy storage high-voltage box according to claim 1, characterized in that: The main circuit includes a positive circuit connecting the positive output of the battery box and the positive electrode of the load, and a negative circuit connecting the negative output of the battery box and the negative electrode of the load; The first switch module includes a first sub-switch and a second sub-switch that are arranged in linkage. The first sub-switch is connected in series to the positive circuit, and the second sub-switch is connected in series to the negative circuit.

3. The energy storage high-voltage box according to claim 2, characterized in that: The pre-charge circuit includes a pre-charge positive circuit connected in parallel to the positive circuit, and a pre-charge negative circuit connected in parallel to the negative circuit; The second switch module includes a third sub-switch and a fourth sub-switch that are arranged in linkage, the third sub-switch is connected in series to the pre-charge positive circuit, and the fourth sub-switch is connected in series to the pre-charge negative circuit.

4. The energy storage high-voltage box according to claim 3, characterized in that: A balancing resistor is connected in series to the pre-charge positive circuit, a first end of the balancing resistor is connected to the positive output electrode of the battery box and the first end of the first sub-switch, and a second end of the balancing resistor is connected to the positive electrode of the load and the second end of the first sub-switch.

5. The energy storage high-voltage box according to claim 2, characterized in that: The negative electrode circuit is connected to a current detection unit, and the current detection unit is connected to the BMS main control module; and / or, A fuse is connected in series to the positive electrode loop, a first end of the fuse is connected to the positive output electrode of the battery box, and a second end of the fuse is connected to the first end of the first sub-switch.

6. The energy storage high-voltage box according to claim 1, characterized in that: The circuit breaker has a feedback switch module connected to the BMS main control module, and the feedback switch module is used to feed back the contact status of the circuit breaker to the BMS main control module.

7. The energy storage high-voltage box according to claim 1, characterized in that: The rated voltage of the circuit breaker is 2500V.

8. The energy storage high-voltage box according to claim 1, characterized in that: It also includes a power supply module, and the BMS main control module is connected to the power supply module; and / or, The BMS main control module is provided with a network interface for communicating with external devices.

9. An energy storage system, characterized in that: The energy storage system is provided with an energy storage high-voltage box as claimed in any one of claims 1 to 8.

10. An energy storage power station, characterized in that: The energy storage power station includes the energy storage system described in claim 9.

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