High voltage tank and battery energy storage system

Abstract

The application relates to a high-voltage box and a battery energy storage system. A relay module is arranged in a positive electrode branch of the high-voltage box, and the relay module is connected between a first positive electrode end and a second positive electrode end of the positive electrode branch. The first positive electrode end is used for connecting the positive electrode of at least one battery module, and the second positive electrode end is used for connecting the positive electrode of a corresponding energy storage converter. A first negative electrode end is used for connecting the negative electrode of at least one battery module, and a second negative electrode end is used for connecting the negative electrode of a corresponding energy storage converter. A lightning protection module is connected to the second positive electrode end of the positive electrode branch and the second negative electrode end of the negative electrode branch respectively, and the lightning protection module is used for grounding, thereby realizing cluster-level lightning protection of the high-voltage box. The high-voltage box does not need to be connected with an external transfer cabinet between the high-voltage box and a PCS, and only the relay module is arranged in the positive electrode branch, and the negative electrode branch does not need to be provided with the relay module, thereby reducing the cost. The lightning protection module arranged between the positive electrode branch and the negative electrode branch realizes lightning protection of each branch, and the safety of the high-voltage box is improved.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a high-voltage box and battery energy storage system. Background Technology

[0002] With the development of energy storage applications and scenarios, string energy storage and centralized energy storage, as two important energy storage methods, each demonstrate unique advantages and applicable scenarios. In the system structure of string energy storage, the battery cluster includes a high-voltage box, with each high-voltage box connected to a power converter (PCS). String energy storage offers high flexibility and scalability.

[0003] In existing high-voltage boxes used for string energy storage, an external transfer cabinet is usually required to connect the high-voltage box and the PCS, which is costly and has low security. Utility Model Content

[0004] Based on this, a high-voltage box and a battery energy storage system are provided.

[0005] In a first aspect, this application provides a high-pressure box, comprising:

[0006] The positive branch has a first positive terminal and a second positive terminal. The positive branch is equipped with a relay module, which is connected between the first positive terminal and the second positive terminal of the positive branch. The first positive terminal is used to connect to the positive terminal of at least one battery module, and the second positive terminal is used to connect to the positive terminal of the corresponding energy storage converter.

[0007] The negative terminal branch has a first negative terminal and a second negative terminal. The first negative terminal is used to connect to the negative terminal of at least one battery module, and the second negative terminal is used to connect to the negative terminal of the corresponding energy storage converter.

[0008] The lightning protection module is connected to the second positive terminal of the positive branch and the second negative terminal of the negative branch, and is used for grounding.

[0009] In one embodiment, the lightning protection module includes a surge protector, a first fuse, and a second fuse; the surge protector has a positive terminal, a negative terminal, and a grounding terminal;

[0010] The first end of the first fuse is connected to the second positive terminal of the positive branch, and the second end of the first fuse is connected to the positive terminal of the surge protector.

[0011] The first end of the second fuse is connected to the second negative terminal of the negative branch, and the second end of the second fuse is connected to the negative terminal of the surge protector; the grounding terminal of the surge protector is used for grounding.

[0012] In one embodiment, the high-voltage box further includes a first disconnect switch and a second disconnect switch;

[0013] The first disconnecting switch is installed in the positive branch, and the first disconnecting switch is connected in series with the relay module;

[0014] The second disconnecting switch is installed in the negative branch, and the second disconnecting switch is connected between the first negative terminal and the second negative terminal of the negative branch.

[0015] In one embodiment, the negative branch is also provided with a current acquisition module;

[0016] The current acquisition module is connected in series with the second disconnect switch.

[0017] In one embodiment, the positive branch is also provided with a third fuse;

[0018] The third fuse is connected in series with the relay module.

[0019] In one embodiment, the relay module includes a main positive relay, a precharge relay, and a precharge resistor;

[0020] The first terminal of the main positive relay is connected to the third fuse, and the second terminal of the main positive relay is connected to the first disconnecting switch; the first terminal of the precharge relay is connected to the first terminal of the main positive relay, the second terminal of the precharge relay is connected to the first terminal of the precharge resistor, and the second terminal of the precharge resistor is connected to the second terminal of the main positive relay.

[0021] In one embodiment, the high-voltage box further includes a first voltage acquisition module and a second voltage acquisition module;

[0022] The first voltage acquisition module is connected to the positive branch, and the second voltage acquisition module is connected to the negative branch.

[0023] In one embodiment, the high-voltage box further includes a box body, and one side of the box body is provided with a first positive terminal interface, a second positive terminal interface, a first negative terminal interface, a second negative terminal interface and a lightning protection grounding interface.

[0024] The first positive terminal is connected to the first positive terminal of the positive branch, and the second positive terminal is connected to the second positive terminal of the positive branch; the first negative terminal is connected to the first negative terminal of the negative branch, and the first negative terminal is connected to the second negative terminal of the negative branch.

[0025] The lightning protection grounding interface is used to connect to the grounding terminal of the lightning protection module.

[0026] In one embodiment, the enclosure includes an enclosure grounding point; the lightning protection grounding interface is provided with a waterproof connector, which is used to connect a grounding wire, and the grounding wire is connected to the enclosure grounding point.

[0027] Secondly, this application also provides a battery energy storage system, including multiple energy storage converters and multiple high-voltage boxes as described above; the high-voltage boxes are used to connect at least one battery module.

[0028] Each high-voltage box is connected to each energy storage converter in a corresponding manner.

[0029] One of the above technical solutions has the following advantages and beneficial effects:

[0030] The aforementioned high-voltage box includes a positive branch, a negative branch, and a surge protection module. The positive branch has a first positive terminal and a second positive terminal, and a relay module is installed in the positive branch, connected between the first positive terminal and the second positive terminal. The first positive terminal is used to connect to the positive terminal of at least one battery module, and the second positive terminal is used to connect to the positive terminal of the corresponding energy storage converter. The negative branch has a first negative terminal and a second negative terminal. The first negative terminal is used to connect to the negative terminal of at least one battery module, and the second negative terminal is used to connect to the negative terminal of the corresponding energy storage converter. The surge protection module is connected to the second positive terminal of the positive branch and the second negative terminal of the negative branch, respectively, and is used for grounding to achieve cluster-level surge protection of the high-voltage box. This application connects the energy storage converter and the corresponding battery module through the positive branch and the negative branch, respectively. There is no need for an external adapter cabinet between the high-voltage box and the PCS. Furthermore, a relay module is only installed on the positive branch, and no relay module is required on the negative branch, which reduces costs. By installing a lightning protection module between the positive and negative branches, lightning protection is achieved for each branch, thereby improving the safety of the high-voltage box. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the first circuit of the high-voltage box in an embodiment of this application;

[0032] Figure 2 This is a schematic diagram of the first circuit of the high-voltage box in an embodiment of this application;

[0033] Figure 3 This is a side view of the high-voltage box in an embodiment of this application.

[0034] Figure label:

[0035] 10. Positive branch; 110. Relay module; 112. Main positive relay; 114. Precharge relay; 116. Precharge resistor; 120. Third fuse; 20. Negative branch; 210. Current acquisition module; 30. Lightning protection module; 310. Lightning arrester; 320. First fuse; 330. Second fuse; 400. First disconnect switch; 410. Second disconnect switch; 420. First voltage acquisition module; 430. Second voltage acquisition module; 50. Housing; 510. First positive interface; 520. Second positive interface; 530. First negative interface; 540. Second negative interface; 550. Lightning protection grounding interface; 60. Battery module; 70. Energy storage converter. Detailed Implementation

[0036] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0037] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0038] In addition, the term "multiple" should mean two or more.

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] In one embodiment, such as Figure 1 As shown, a high-voltage box is also provided, including a positive branch 10, a negative branch 20, and a surge protection module 30. The positive branch 10 has a first positive terminal and a second positive terminal. A relay module 110 is provided in the positive branch 10, and the relay module 110 is connected between the first positive terminal and the second positive terminal of the positive branch 10. The first positive terminal is used to connect to the positive terminal of at least one battery module 60, and the second positive terminal is used to connect to the positive terminal of the corresponding energy storage converter 70. The negative branch 20 has a first negative terminal and a second negative terminal. The first negative terminal is used to connect to the negative terminal of at least one battery module 60, and the second negative terminal is used to connect to the negative terminal of the corresponding energy storage converter 70. The surge protection module 30 is connected to the second positive terminal of the positive branch 10 and the second negative terminal of the negative branch 20, respectively, and the surge protection module 30 is used for grounding.

[0041] The battery module 60 can be a lithium battery module 60, which can be composed of multiple individual cells. Each individual cell can be a lithium-ion battery, and can have a square structure, with the individual cells arranged at preset intervals. A high-voltage box can connect to multiple corresponding battery modules 60, forming a battery cluster; that is, one high-voltage box corresponds to one battery cluster. An energy storage converter 70 is used to control the AC / DC conversion during the charging and discharging of the corresponding battery module cluster. The energy storage converter 70 is connected to the negative terminal of the second negative terminal and the positive terminal of the second positive terminal of the corresponding high-voltage box; that is, one energy storage converter 70 corresponds to one high-voltage box.

[0042] The first positive terminal (B+ terminal) of the positive branch 10 is used to connect to the positive terminal of at least one battery module 60. For example, if a corresponding battery cluster includes multiple battery modules 60, the first positive terminal of the positive branch 10 is connected to the positive terminal of each battery module 60 in the corresponding battery cluster. A relay module 110 is disposed in the positive branch 10, such as a relay module 110 connected in series between the first and second positive terminals of the positive branch 10. The second positive terminal (P+ terminal) of the positive branch 10 is used to connect to the positive terminal of the energy storage converter 70. For example, each energy storage converter 70 is connected to a transformer, and the voltage is transformed by the transformer before being connected to the power grid. The first negative terminal (B- terminal) of the negative branch 20 is used to connect to the negative terminal of at least one battery module 60. For example, if a corresponding battery cluster includes multiple battery modules 60, the first negative terminal of the negative branch 20 is connected to the negative terminal of each battery module 60 in the corresponding battery cluster. The second negative terminal (i.e., P-terminal) of the negative branch 20 is used to connect to the negative terminal of the energy storage converter 70. Since the energy storage converter 70 has the ability to cut off the DC input, by configuring a relay module 110 in the positive branch 10, the negative branch 20 does not need to be configured with a relay module 110, which can realize the circuit switching and save costs.

[0043] The surge protection module 30 is installed inside the high-voltage box. For example, the surge protection module 30 has a first end, a second end and a grounding end. The first end of the surge protection module 30 is used to connect to the second positive terminal of the positive branch 10, the second end of the surge protection module 30 is connected to the second negative terminal of the negative branch 20, and the grounding end of the surge protection module 30 is used for grounding to realize the surge protection of each branch at the cluster level.

[0044] In the above embodiment, the relay module 110 is connected between the first positive terminal and the second positive terminal of the positive branch 10; the first positive terminal is used to connect to the positive terminal of at least one battery module 60, and the second positive terminal is used to connect to the positive terminal of the corresponding energy storage converter 70; the first negative terminal is used to connect to the negative terminal of at least one battery module 60, and the second negative terminal is used to connect to the negative terminal of the corresponding energy storage converter 70; the lightning protection module 30 is connected to the second positive terminal of the positive branch 10 and the second negative terminal of the negative branch 20 respectively, and the lightning protection module 30 is used for grounding, realizing the on / off control of the cluster-level battery module 60, and also realizing the branch disconnection during maintenance, as well as realizing the cluster-level branch lightning protection. This application connects the energy storage converter 70 and the corresponding battery module 60 through the positive branch 10, and connects the energy storage converter 70 and the corresponding battery module 60 through the negative branch 20. There is no need to connect an external adapter cabinet between the high-voltage box and the PCS. Moreover, only the relay module 110 is set in the positive branch 10, and the relay module 110 is not required in the negative branch 20, which reduces the cost. By setting a lightning protection module 30 between the positive branch 10 and the negative branch 20, lightning protection is achieved for each branch, which improves the safety of the high-voltage box.

[0045] In one embodiment, such as Figure 2 As shown, the surge protection module 30 includes a surge protector 310, a first fuse 320, and a second fuse 330. The surge protector 310 has a positive terminal, a negative terminal, and a grounding terminal. The first terminal of the first fuse 320 is connected to the second positive terminal of the positive branch 10, and the second terminal of the first fuse 320 is connected to the positive terminal of the surge protector 310. The first terminal of the second fuse 330 is connected to the second negative terminal of the negative branch 20, and the second terminal of the second fuse 330 is connected to the negative terminal of the surge protector 310. The grounding terminal of the surge protector 310 is used for grounding.

[0046] The first fuse 320 is used to provide backup protection for the positive branch 10; the second fuse 330 is used to provide backup protection for the negative branch 20.

[0047] Since the first fuse 320 is connected between the second positive terminal of the positive branch 10 and the positive terminal of the surge protector 310, and the second fuse 330 is connected between the second negative terminal of the negative branch 20 and the negative terminal of the surge protector 310, and the surge protector 310 is connected to the ground wire, when lightning strikes the system, it can divert the lightning current to the ground, thereby protecting equipment and personal safety. Furthermore, when a short circuit occurs between the positive branch 10 and the surge protector 310, the first fuse 320 can disconnect in time, further strengthening the protection of the positive branch 10; similarly, when a short circuit occurs between the negative branch 20 and the surge protector 310, the second fuse 330 can disconnect in time, further strengthening the protection of the negative branch 20.

[0048] In one embodiment, such as Figure 2 As shown, the high-voltage box also includes a first disconnecting switch 400 and a second disconnecting switch 410; the first disconnecting switch 400 is located in the positive branch 10 and is connected in series with the relay module 110; the second disconnecting switch 410 is located in the negative branch 20 and is connected between the first negative terminal and the second negative terminal of the negative branch 20.

[0049] The first disconnecting switch 400 can be used to disconnect the positive branch 10, isolating the positive terminal of the corresponding battery module 60 from the positive terminal of the energy storage converter 70; the second disconnecting switch 410 can be used to disconnect the negative branch 20, isolating the negative terminal of the corresponding battery module 60 from the negative terminal of the energy storage converter 70. For example, the high-voltage box has a housing 50, and a switch handle is provided on one side of the housing 50. The user can operate the switch handle to control the opening or closing of the corresponding disconnecting switches (first disconnecting switch 400 and second disconnecting switch 410).

[0050] For example, the first end of the first disconnect switch 400 is connected to the relay module 110, and the second end of the first disconnect switch 400 is connected to the second positive terminal of the positive branch 10; the first end of the second disconnect switch 410 is connected to the first negative terminal of the negative branch 20, and the second end of the second disconnect switch 410 is connected to the second negative terminal of the negative branch 20. Thus, when circuit maintenance is required, the corresponding disconnect switches (such as the first disconnect switch 400 and / or the second disconnect switch 410) can be disconnected to form a disconnection on the positive branch 10 and / or the negative branch 20, ensuring complete isolation between the corresponding battery module 60 and the energy storage converter 70, and improving the safety of maintenance.

[0051] In one embodiment, such as Figure 2 As shown, the negative branch 20 is also equipped with a current acquisition module 210; the current acquisition module 210 is connected in series with the second disconnecting switch 410.

[0052] The current acquisition module 210 can be a shunt or a current transformer.

[0053] For example, the first end of the current acquisition module 210 is connected to the first negative terminal of the negative branch 20, the second end of the current acquisition module 210 is connected to the first end of the second disconnect switch 410, and the second end of the second disconnect switch 410 is connected to the second negative terminal of the negative branch 20. Thus, the current of the negative branch 20 can be detected by the current acquisition module 210 to obtain the current magnitude of the corresponding cluster-level battery module 60 during the charging and discharging process.

[0054] In one embodiment, such as Figure 2As shown, the positive branch 10 is also equipped with a third fuse 120; the third fuse 120 is connected in series with the relay module 110.

[0055] For example, the first positive terminal of the first terminal of the third fuse 120 is connected to the first positive terminal of the positive branch 10, and the second terminal of the third fuse 120 is connected to the relay module 110. When an overcurrent or short circuit occurs in the positive branch 10, the third fuse 120 can melt to quickly cut off the fault current in the branch and play a protective role.

[0056] In one embodiment, such as Figure 2 As shown, the relay module 110 includes a main positive relay 112, a precharge relay 114, and a precharge resistor 116; the first terminal of the main positive relay 112 is connected to the third fuse 120, and the second terminal of the main positive relay 112 is connected to the first disconnecting switch 400; the first terminal of the precharge relay 114 is connected to the first terminal of the main positive relay 112, the second terminal of the precharge relay 114 is connected to the first terminal of the precharge resistor 116, and the second terminal of the precharge resistor 116 is connected to the second terminal of the main positive relay 112.

[0057] Among them, the main positive relay 112 is used to control the switching on and off of high voltage; the pre-charge relay 114 is used to switch on and off of the control circuit; and the pre-charge resistor 116 is used to limit the flow of current.

[0058] Since the main positive relay 112 is connected between the third fuse 120 and the first disconnecting switch 400, the precharge relay 114 and the precharge resistor 116 are connected in series, and the series-connected precharge relay 114 and precharge resistor 116 are connected in parallel to the main positive relay 112. Then, during the power-on precharge stage, the precharge relay 114 is closed, and the precharge relay 114 and the precharge resistor 116 form a precharge circuit, so that the current can precharge the corresponding capacitor through the precharge resistor 116. When the precharge is completed, the main positive relay 112 closes at the port of the precharge relay 114, so that the circuit enters the normal working state.

[0059] In one embodiment, such as Figure 2 As shown, the high-voltage box also includes a first voltage acquisition module 420 and a second voltage acquisition module 430; the first voltage acquisition module 420 is connected to the positive branch 10, and the second voltage acquisition module 430 is connected to the negative branch 20.

[0060] The first voltage acquisition module 420 may include at least one first voltage transformer, and the second voltage acquisition module 430 may include at least one second voltage transformer.

[0061] For example, a first voltage transformer is installed between the first positive terminal of the positive branch 10 and the first terminal of the third fuse 120 to collect the voltage of the positive terminal of the corresponding battery module 60; another first voltage transformer is installed between the relay module 110 and the first disconnect switch 400 to collect the voltage of the positive terminal of the corresponding energy storage converter 70; and a second voltage transformer is installed between the first negative terminal of the negative branch 20 and the first terminal of the current acquisition module 210 to collect the voltage of the negative terminal of the corresponding battery module 60.

[0062] In one embodiment, such as Figure 2 and Figure 3 As shown, the high-voltage box also includes a housing 50. One side of the housing 50 is provided with a first positive interface 510, a second positive interface 520, a first negative interface 530, a second negative interface 540, and a lightning protection grounding interface 550. The first positive interface 510 is connected to the first positive terminal of the positive branch 10, and the second positive interface 520 is connected to the second positive terminal of the positive branch 10. The first negative interface 530 is connected to the first negative terminal of the negative branch 20, and the first negative interface 530 is connected to the second negative terminal of the negative branch 20. The lightning protection grounding interface 550 is used to connect to the grounding terminal of the lightning protection module 30.

[0063] The shape of the enclosure 50 may be, but is not limited to, square. One side of the enclosure 50 (such as the front side) is provided with a first positive interface 510, a second positive interface 520, a first negative interface 530, a second negative interface 540, and a lightning protection grounding interface 550. The first positive interface 510 is used to connect to the positive terminal of the corresponding cluster-level battery module 60, the second positive interface 520 is used to connect to the positive terminal of the corresponding energy storage converter 70, the first negative interface 530 is used to connect to the negative terminal of the corresponding cluster-level battery module 60, the second negative interface 540 is used to connect to the negative terminal of the corresponding energy storage converter 70, and the lightning protection grounding interface 550 is used to connect to the grounding wire.

[0064] It should be noted that a first communication interface and a second communication interface are also provided on one side of the housing 50. The first communication interface can be used to plug in the corresponding communication line to realize communication between battery modules 60 within the cluster; the second communication interface can be used to plug in the corresponding communication line to realize communication between battery modules 60 between clusters.

[0065] For example, the first positive interface 510, the second positive interface 520, the first negative interface 530, and the second negative interface 540 are each provided with a corresponding waterproof connector, thereby facilitating testing operations while ensuring the waterproof performance of the entire high-voltage box and improving the electrical safety of the high-voltage box.

[0066] In one embodiment, the enclosure 50 includes an enclosure 50 grounding point; the lightning protection grounding interface 550 is provided with a waterproof connector, which is used to connect a grounding wire, and the grounding wire is connected to the enclosure 50 grounding point.

[0067] By installing a waterproof connector at the lightning protection grounding interface 550, and then connecting the grounding wire to the grounding point of the enclosure 50 through the waterproof connector, both grounding continuity and waterproof performance of the high-voltage box are guaranteed.

[0068] For example, the grounding wire is connected to the grounding point of the enclosure 50 through a waterproof interface. During the insulation withstand voltage test, the test voltage is applied between the first positive terminal (B+) of the positive branch 10, the first negative terminal (B-) of the negative branch 20, and the grounding terminal (PE). In order to ensure the accuracy of the test and the safety of the surge protector 310 during the test, the external surge protection grounding point needs to be removed during the insulation withstand voltage test and then reconnected after the test. During the insulation withstand voltage test, the surge protection grounding is disconnected by disconnecting the grounding, which ensures the accuracy of the test and the safety of the surge protector 310.

[0069] In one embodiment, a battery energy storage system is also provided, including a plurality of energy storage converters and a plurality of high-voltage boxes as described above; the high-voltage boxes are used to connect at least one battery module; each high-voltage box is connected to each energy storage converter in a one-to-one correspondence.

[0070] For detailed descriptions of the battery module, energy storage converter, and high-voltage box, please refer to the descriptions in the above embodiments; they will not be repeated here.

[0071] For example, a battery energy storage system includes multiple battery clusters, each battery cluster is equipped with a high-voltage box, and each high-voltage box is equipped with an energy storage converter. Each battery cluster includes at least one battery module. The high-voltage box includes a positive branch, a negative branch, and a surge protection module. The positive branch has a first positive terminal and a second positive terminal, and a relay module is installed in the positive branch, connected between the first positive terminal and the second positive terminal. The first positive terminal is used to connect to the positive terminal of at least one battery module, and the second positive terminal is used to connect to the positive terminal of the corresponding energy storage converter. The negative branch has a first negative terminal and a second negative terminal. The first negative terminal is used to connect to the negative terminal of at least one battery module, and the second negative terminal is used to connect to the negative terminal of the corresponding energy storage converter. The surge protection module is connected to the second positive terminal of the positive branch and the second negative terminal of the negative branch, respectively, and is used for grounding to achieve surge protection for each cluster of the battery energy storage system.

[0072] In the above embodiments, the energy storage converter and the corresponding battery module are connected through the positive branch and the corresponding battery module through the negative branch. There is no need to connect an external adapter cabinet between the high-voltage box and the PCS. Moreover, a relay module is only set in the positive branch, and no relay module is set in the negative branch, which reduces the cost. By setting a lightning protection module between the positive and negative branches, cluster-level lightning protection of each branch is realized, which improves the safety of the battery energy storage system.

[0073] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A high-pressure box, characterized in that, include: A positive terminal branch has a first positive terminal and a second positive terminal. The positive terminal branch is equipped with a relay module connected between the first positive terminal and the second positive terminal of the positive terminal branch. The first positive terminal is used to connect to the positive terminal of at least one battery module, and the second positive terminal is used to connect to the positive terminal of a corresponding energy storage converter. The negative terminal branch has a first negative terminal and a second negative terminal. The first negative terminal is used to connect to the negative terminal of at least one battery module, and the second negative terminal is used to connect to the negative terminal of a corresponding energy storage converter. A lightning protection module is provided, which is connected to the second positive terminal of the positive branch and the second negative terminal of the negative branch, and is used for grounding.

2. The high-voltage box according to claim 1, characterized in that, The lightning protection module includes a surge protector, a first fuse, and a second fuse; the surge protector has a positive terminal, a negative terminal, and a grounding terminal; The first end of the first fuse is connected to the second positive terminal of the positive branch, and the second end of the first fuse is connected to the positive terminal of the surge protector; The first end of the second fuse is connected to the second negative terminal of the negative branch, and the second end of the second fuse is connected to the negative terminal of the surge protector; the grounding terminal of the surge protector is used for grounding.

3. The high-pressure box according to claim 1, characterized in that, It also includes a first disconnect switch and a second disconnect switch; The first disconnecting switch is installed in the positive branch, and the first disconnecting switch is connected in series with the relay module; The second disconnecting switch is disposed in the negative branch and is connected between the first negative terminal and the second negative terminal of the negative branch.

4. The high-pressure box according to claim 3, characterized in that, The negative electrode branch is also equipped with a current acquisition module; The current acquisition module is connected in series with the second disconnecting switch.

5. The high-voltage box according to claim 3, characterized in that, The positive electrode branch is also equipped with a third fuse; The third fuse is connected in series with the relay module.

6. The high-voltage box according to claim 5, characterized in that, The relay module includes a main positive relay, a pre-charge relay, and a pre-charge resistor; The first terminal of the main positive relay is connected to the third fuse, and the second terminal of the main positive relay is connected to the first disconnecting switch; the first terminal of the precharge relay is connected to the first terminal of the main positive relay, the second terminal of the precharge relay is connected to the first terminal of the precharge resistor, and the second terminal of the precharge resistor is connected to the second terminal of the main positive relay.

7. The high-voltage box according to claim 1, characterized in that, It also includes a first voltage acquisition module and a second voltage acquisition module; The first voltage acquisition module is connected to the positive branch, and the second voltage acquisition module is connected to the negative branch.

8. The high-pressure box according to any one of claims 1 to 7, characterized in that, It also includes a housing, one side of which is provided with a first positive interface, a second positive interface, a first negative interface, a second negative interface, and a lightning protection grounding interface; The first positive terminal is connected to the first positive terminal of the positive branch, and the second positive terminal is connected to the second positive terminal of the positive branch; the first negative terminal is connected to the first negative terminal of the negative branch, and the first negative terminal is connected to the second negative terminal of the negative branch. The lightning protection grounding interface is used to connect to the grounding terminal of the lightning protection module.

9. The high-voltage box according to claim 8, characterized in that, The enclosure includes an enclosure grounding point; the lightning protection grounding interface is equipped with a waterproof connector, which is used to connect a grounding wire, and the grounding wire is connected to the enclosure grounding point.

10. A battery energy storage system, characterized in that, It includes multiple energy storage converters and multiple high-voltage boxes as described in any one of claims 1 to 9; the high-voltage boxes are used to connect at least one battery module; Each of the high-voltage boxes is connected to each of the energy storage converters in a one-to-one correspondence.

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