Energy storage high-voltage box

Abstract

The utility model discloses an energy storage high voltage box, comprising a first battery cluster loop comprising a first equalization relay, one end of the first battery cluster loop is connected with a first battery cluster, and the other end of the first battery cluster loop is connected with the output end of the energy storage high voltage box; the second battery cluster loop comprises a second equalization relay, one end of the second battery cluster loop is connected with the second battery pack, and the other end of the second battery cluster loop is connected with the output end of the energy storage high-voltage box; and the battery management main control board is used for controlling the actuation of the first equalization relay and the second equalization relay when the voltage difference between the first battery cluster loop and the second battery cluster exceeds a preset voltage difference, so that the voltage of the first battery cluster loop and the voltage of the second battery cluster loop are equalized. The work of two battery cluster loops is controlled through the battery management main control board, so that one energy storage high-voltage box integrates two groups of battery clusters, and the cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and more specifically, to an energy storage high-voltage box. Background Art

[0002] With the rapid development of the energy storage industry, the cost per kilowatt-hour of large-scale energy storage is getting lower and lower. Under the premise of ensuring safe and reliable operation, the lower the cost, the more advantageous it is. The high-voltage box is an indispensable part of the battery cluster.

[0003] like Figure 1 The figure shows the structure of an existing energy storage battery cluster. Each cluster is equipped with a high-voltage box, which includes 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. If the system contains multiple clusters, multiple high-voltage boxes are required, which is costly.

[0004] Therefore, providing an energy storage high-voltage box to integrate two battery clusters into a single energy storage high-voltage box and reduce costs is a technical problem that needs to be solved. Utility Model Content

[0005] The embodiment of the present application proposes an energy storage high-voltage box to solve the technical problem in the prior art that one energy storage high-voltage box can only correspond to one battery cluster, resulting in excessively high costs.

[0006] The energy storage high-voltage box includes:

[0007] A first battery cluster loop includes a first balancing relay, one end of the first battery cluster loop is connected to the first battery cluster, and the other end is connected to the output end of the energy storage high-voltage box;

[0008] The second battery cluster loop includes a second balancing relay, one end of the second battery cluster loop is connected to the second battery pack, and the other end is connected to the output end of the energy storage high-voltage box

[0009] a battery management main control board, configured to control the first balancing relay and the second balancing relay to be closed when the voltage difference between the first battery cluster circuit and the second battery cluster circuit exceeds a preset voltage difference, so as to balance the voltage of the first battery cluster circuit with the voltage of the second battery cluster circuit;

[0010] The battery management main control board is connected to the first battery cluster circuit and the second battery cluster circuit respectively.

[0011] In some embodiments, the first battery cluster loop includes a first battery cluster positive electrode unit and a first battery cluster negative electrode unit, and the second battery cluster loop includes a second battery cluster positive electrode unit and a second battery cluster negative electrode unit, the first end of the first battery cluster positive electrode unit is connected to the positive electrode of the first battery cluster, the second end of the first battery cluster positive electrode unit is connected to the positive electrode of the output end of the energy storage high-voltage box through the first balancing relay, the first end of the first battery cluster negative electrode unit is connected to the negative electrode of the first battery cluster, the second end of the first battery cluster negative electrode unit is connected to the negative electrode of the output end of the energy storage high-voltage box, the first end of the second battery cluster positive electrode unit is connected to the positive electrode of the second battery cluster, the second end of the second battery cluster positive electrode unit is connected to the positive electrode of the output end of the energy storage high-voltage box through the second balancing relay, the first end of the second battery cluster negative electrode unit is connected to the negative electrode of the second battery cluster, and the second end of the second battery cluster negative electrode unit is connected to the negative electrode of the output end of the energy storage high-voltage box.

[0012] In some embodiments, the first battery cluster positive electrode unit further includes a first fuse and a first positive electrode relay.

[0013] The first end of the first fuse is connected to the positive electrode of the first battery cluster as the first end of the positive electrode unit of the first battery cluster, the common contact point of the first end of the first positive electrode relay and the first end of the first balancing relay is connected to the second end of the first fuse, and the common contact point of the second end of the first positive electrode relay and the first end of the first balancing relay is connected to the positive electrode of the output end of the energy storage high-voltage box as the second end of the positive electrode unit of the first battery cluster.

[0014] In some embodiments, the second battery cluster positive electrode unit further includes a second fuse and a second positive electrode relay.

[0015] The first end of the second fuse is connected to the positive electrode of the second battery cluster as the first end of the positive electrode unit of the second battery cluster, the common contact point of the first end of the second positive electrode relay and the first end of the second balancing relay is connected to the second end of the second fuse, and the common contact point of the second end of the second positive electrode relay and the first end of the second balancing relay is connected to the positive electrode of the output end of the energy storage high-voltage box as the second end of the positive electrode unit of the second battery cluster.

[0016] In some embodiments, both the first battery cluster negative electrode unit and the second battery cluster negative electrode unit include a shunt or a current sensor, and when the first battery cluster negative electrode unit or the second battery cluster negative electrode unit includes a shunt, the other one includes a current sensor, wherein the first end of the shunt is connected to the positive electrode of the first battery cluster or the positive electrode of the second battery cluster, the first end of the current sensor is connected to the positive electrode of the first battery cluster or the positive electrode of the second battery cluster, and the common point of the second end of the shunt and the second end of the current sensor is connected to the negative electrode of the output end of the energy storage high-voltage box.

[0017] In some embodiments, the first battery cluster positive electrode unit further includes a first balancing resistor, a first end of the first balancing resistor is connected to a first end of the first fuse and a first end of the first positive relay, and a second end of the first balancing resistor is connected to a first end of the first balancing relay.

[0018] In some embodiments, the second battery cluster positive unit further includes a second balancing resistor, a first end of the second balancing resistor is connected to the first end of the second fuse and the first end of the second positive relay, and a second end of the second balancing resistor is connected to the first end of the second balancing relay.

[0019] In some embodiments, the energy storage high voltage box further includes a total negative relay.

[0020] The common point of the second end of the shunt or current sensor of the negative electrode unit of the first battery cluster and the second end of the shunt or current sensor of the negative electrode unit of the second battery cluster is connected to the first end of the total negative relay, and the second end of the total negative relay is connected to the negative output terminal of the energy storage high-voltage box.

[0021] In some embodiments, the energy storage high-voltage box also includes an isolating switch, the second end of the total negative relay is connected to the second end of the isolating switch, the common contact of the second end of the first positive relay, the second end of the first balancing relay, the second end of the second balancing relay and the second end of the second positive relay is connected to the first end of the isolating switch, the third end of the isolating switch is connected to the positive pole of the output end of the energy storage high-voltage box, and the fourth end of the isolating switch is connected to the negative pole of the output end of the energy storage high-voltage box.

[0022] In some embodiments, the current sensor is connected to the CANH pin and the CANL pin of the battery management main control board via CAN communication, and the shunt is connected to the GPIO pin of the battery management main control board.

[0023] By applying the above technical solution, the energy storage high-voltage box includes: a first battery cluster circuit, including a first balancing relay, one end of the first battery cluster circuit is connected to the first battery cluster, and the other end is connected to the output end of the energy storage high-voltage box; a second battery cluster circuit, including a second balancing relay, one end of the second battery cluster circuit is connected to the second battery pack, and the other end is connected to the output end of the energy storage high-voltage box; a battery management main control board, which is used to control the first balancing relay and the second balancing relay to be attracted when the voltage difference between the first battery cluster circuit and the second battery cluster exceeds a preset pressure difference, so that the voltage of the first battery cluster circuit is balanced with the voltage of the second battery cluster circuit; wherein the battery management main control board is respectively connected to the first battery cluster circuit and the second battery cluster circuit, and the operation of the two battery cluster circuits is controlled by the battery management main control board, so that one energy storage high-voltage box integrates two groups of battery clusters, thereby reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 The schematic diagram of the structure of the energy storage high-voltage box in the prior art is shown;

[0026] Figure 2 The following is a schematic diagram showing the structure of an energy storage high-voltage box proposed in an embodiment of the present utility model;

[0027] Figure 3 A schematic structural diagram of another energy storage high-voltage box proposed in an embodiment of the present utility model is shown;

[0028] Figure 4 The following is a schematic diagram showing the circuit structure of an energy storage high-voltage box proposed in an embodiment of the present utility model;

[0029] Figure 5 The figure shows a connection diagram of the battery management main control board, the shunt and the current sensor proposed in the embodiment of the present utility model. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0031] The embodiment of the present application proposes an energy storage high-voltage box, such as Figure 2 As shown, the energy storage high-voltage box includes:

[0032] A first battery cluster loop includes a first balancing relay K2, one end of the first battery cluster loop is connected to the first battery cluster, and the other end is connected to the output end of the energy storage high-voltage box;

[0033] A second battery cluster loop includes a second balancing relay K3, one end of the second battery cluster loop is connected to the second battery pack, and the other end is connected to the output end of the energy storage high-voltage box;

[0034] The battery management main control board is used to control the first balancing relay K2 and the second balancing relay K3 to be attracted when the voltage difference between the first battery cluster circuit and the second battery cluster circuit exceeds a preset voltage difference, so as to balance the voltage of the first battery cluster circuit with the voltage of the second battery cluster circuit;

[0035] The battery management main control board is connected to the first battery cluster circuit and the second battery cluster circuit respectively.

[0036] In this embodiment, Figure 2 As shown, two battery cluster circuits are provided in the energy storage high-voltage box, corresponding to the first battery cluster and the second battery cluster respectively. The first battery cluster is input into the energy storage high-voltage box through the first battery cluster circuit and output through the output end of the energy storage high-voltage box. The principle of the second battery cluster is the same as that of the first battery cluster and is not explained here. A balancing relay is provided in each battery cluster circuit. The battery management main control board performs balancing processing by controlling the attraction action of each balancing relay to ensure that the voltage of the first battery cluster circuit is balanced with the voltage of the second battery cluster circuit.

[0037] In some embodiments of the present application, Figure 3 As shown, the first battery cluster loop includes a first battery cluster positive electrode unit and a first battery cluster negative electrode unit, and the second battery cluster loop includes a second battery cluster positive electrode unit and a second battery cluster negative electrode unit, the first end of the first battery cluster positive electrode unit is connected to the positive electrode of the first battery cluster, the second end of the first battery cluster positive electrode unit is connected to the positive electrode of the output end of the energy storage high-voltage box through the first balancing relay K2, the first end of the first battery cluster negative electrode unit is connected to the negative electrode of the first battery cluster, the second end of the first battery cluster negative electrode unit is connected to the negative electrode of the output end of the energy storage high-voltage box, the first end of the second battery cluster positive electrode unit is connected to the positive electrode of the second battery cluster, the second end of the second battery cluster positive electrode unit is connected to the positive electrode of the output end of the energy storage high-voltage box through the second balancing relay K3, the first end of the second battery cluster negative electrode unit is connected to the negative electrode of the second battery cluster, and the second end of the second battery cluster negative electrode unit is connected to the negative electrode of the output end of the energy storage high-voltage box.

[0038] In this embodiment, the loop is divided into positive electrode units and negative electrode units according to the positive and negative electrode ports in the loop, that is, the first battery cluster loop includes the first battery cluster positive electrode unit and the first battery cluster negative electrode unit, and the second battery cluster loop includes the second battery cluster positive electrode unit and the second battery cluster negative electrode unit. One end of each positive electrode unit is connected to the positive electrode of its corresponding battery cluster, and the other end is connected to the positive electrode port of the output end of the energy storage high-voltage box through the above-mentioned balancing relay. Correspondingly, one end of each negative electrode unit is connected to the negative electrode of its corresponding battery cluster, and the other end is connected to the negative electrode port of the output end of the energy storage high-voltage box.

[0039] In some embodiments of the present application, in order to further improve the control of the battery cluster and ensure circuit safety, such as Figure 4 As shown, the first battery cluster positive electrode unit also includes a first fuse FU1 and a first positive electrode relay K1.

[0040] The first end of the first fuse FU1 is connected to the positive electrode of the first battery cluster as the first end of the positive electrode unit of the first battery cluster, the common contact point of the first end of the first positive electrode relay K1 and the first end of the first balancing relay K2 is connected to the second end of the first fuse FU1, and the common contact point of the second end of the first positive electrode relay K1 and the first end of the first balancing relay K2 is connected to the positive electrode of the output end of the energy storage high-voltage box as the second end of the positive electrode unit of the first battery cluster.

[0041] In some embodiments of the present application, Figure 4 As shown, the second battery cluster positive electrode unit also includes a second fuse FU2 and a second positive electrode relay K4.

[0042] The first end of the second fuse FU2 is connected to the positive pole of the second battery cluster as the first end of the positive pole unit of the second battery cluster, the common contact point of the first end of the second positive pole relay K4 and the first end of the second balancing relay K3 is connected to the second end of the second fuse FU2, and the common contact point of the second end of the second positive pole relay K4 and the first end of the second balancing relay K3 is connected to the positive pole of the output end of the energy storage high-voltage box as the second end of the positive pole unit of the second battery cluster.

[0043] In some embodiments of the present application, Figure 4As shown, the negative electrode unit of the first battery cluster and the negative electrode unit of the second battery cluster both include a shunt A1 or a current sensor A2, and when the negative electrode unit of the first battery cluster or the negative electrode unit of the second battery cluster includes the shunt A1, the other one includes the current sensor A2, wherein the first end of the shunt A1 is connected to the positive electrode of the first battery cluster or the positive electrode of the second battery cluster, the first end of the current sensor A2 is connected to the positive electrode of the first battery cluster or the positive electrode of the second battery cluster, and the common connection point of the second end of the shunt A1 and the second end of the current sensor A2 is connected to the negative electrode of the output end of the energy storage high-voltage box.

[0044] In this embodiment, shunt A1 is essentially a precision resistor. When cluster 2 (the second battery cluster) outputs current, the precision resistor is connected in series with the negative circuit of cluster 2 (the second battery cluster). When current flows through shunt A1, a voltage drop is generated across shunt A1. The voltage drop signal generated across shunt A1 is then transmitted to the battery management main control board via a wire and then transmitted to GPIO1 of the battery management main control board via a voltage follower circuit. Figure 5 shown.

[0045] In this embodiment, the current sensor A2 is a sensor with CAN communication, which transmits the current signal to the battery management main control board through CAN communication. The important difference between the current sensor A2 and the shunt A1 is that the shunt A1 is an analog signal, while CAN communication transmits a digital signal.

[0046] In this embodiment, when a shunt A1 is provided in the negative electrode unit of the first battery cluster or the negative electrode unit of the second battery cluster, a current sensor A2 is provided in the other negative electrode unit. Different current sampling modes are provided for the two negative electrode units, so that the hardware resources of a single battery management main control board can be fully utilized, and the requirement of one BMS main control board managing the current of two clusters can also be achieved.

[0047] In some embodiments of the present application, Figure 4 As shown, the first battery cluster positive electrode unit further includes a first balancing resistor, a first end of the first balancing resistor is connected to the first end of the first fuse FU1 and the first end of the first positive relay K1, and a second end of the first balancing resistor is connected to the first end of the first balancing relay K2.

[0048] In some embodiments of the present application, Figure 4 As shown, the second battery cluster positive electrode unit further includes a second balancing resistor, a first end of the second balancing resistor is connected to the first end of the second fuse FU2 and the first end of the second positive relay K4, and a second end of the second balancing resistor is connected to the first end of the second balancing relay K3.

[0049] In some embodiments of the present application, Figure 4 As shown, the energy storage high voltage box also includes a total negative relay K5,

[0050] The common point of the second end of the shunt A1 or current sensor A2 of the negative electrode unit of the first battery cluster and the second end of the shunt A1 or current sensor A2 of the negative electrode unit of the second battery cluster is connected to the first end of the total negative relay K5, and the second end of the total negative relay K5 is connected to the negative output terminal of the energy storage high-voltage box.

[0051] In some embodiments of the present application, Figure 4 As shown, the energy storage high-voltage box also includes an isolating switch QS, the second end of the total negative relay K5 is connected to the second end of the isolating switch QS, the second end of the first positive relay K1, the second end of the first balancing relay K2, the second end of the second balancing relay K3 and the second end of the second positive relay K4 are connected to the first end of the isolating switch QS, the third end of the isolating switch QS is connected to the positive output end of the energy storage high-voltage box, and the fourth end of the isolating switch QS is connected to the negative output end of the energy storage high-voltage box.

[0052] In some embodiments of the present application, Figure 5 As shown, the current sensor A2 is connected to the CANH pin and the CANL pin of the battery management main control board through CAN communication, and the shunt A1 is connected to the GPIO pin of the battery management main control board.

[0053] In this embodiment, Figure 5 As shown, the current sensor A2 is connected to the CANH pin and the CANL pin of the battery management main control board, and the shunt A1 is connected to the GPIO pin of the battery management main control board. It should be noted that other components can be further set between the shunt A1 and the battery management main control board, such as Figure 5 The operational amplifier, capacitor, etc. in the shunt A1 are used to further amplify the sampling signal or filter the interference signal, thereby improving the stability of the energy storage high-voltage box.

[0054] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the circuits, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0055] By applying the above technical solution, the energy storage high-voltage box includes: a first battery cluster circuit, including a first balancing relay, one end of the first battery cluster circuit is connected to the first battery cluster, and the other end is connected to the output end of the energy storage high-voltage box; a second battery cluster circuit, including a second balancing relay, one end of the second battery cluster circuit is connected to the second battery pack, and the other end is connected to the output end of the energy storage high-voltage box; a battery management main control board, which is used to control the first balancing relay and the second balancing relay to be attracted when the voltage difference between the first battery cluster circuit and the second battery cluster exceeds a preset pressure difference, so that the voltage of the first battery cluster circuit is balanced with the voltage of the second battery cluster circuit; wherein the battery management main control board is respectively connected to the first battery cluster circuit and the second battery cluster circuit, and the operation of the two battery cluster circuits is controlled by the battery management main control board, so that one energy storage high-voltage box integrates two groups of battery clusters, thereby reducing costs.

[0056] In order to further explain this scheme, Figure 4 , explaining the working principle of this solution.

[0057] In this solution, one high-voltage box manages two battery clusters simultaneously. Only one battery management main control board is required inside the high-voltage box, which communicates with the slave controls in the two battery packs via CAN communication and has an automatic coding function. The currents of the two circuits are measured separately, one using a shunt A1 and the other using a current sensor A2 with CAN communication. The shunt A1 is a passive device, while the current sensor A2 is active. The battery management system main control needs to convert the voltage into 5V through the power management chip to power the current sensor A2. The positive relay uses high-level control, while the negative relay and balancing relay use low-level control. When the voltage difference between the two clusters is within 10V, the battery management system main control attracts the balancing relay to start balancing the two clusters. The balancing resistor specification is 1Ω200W; the balancing relay has an overcurrent capacity of 20A.

[0058] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0059] In this utility model, unless otherwise specified or limited, the terms "enter," "connect," and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0060] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0061] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A high-voltage energy storage box, characterized in that: The energy storage high-voltage box includes: A first battery cluster loop includes a first balancing relay, one end of the first battery cluster loop is connected to the first battery cluster, and the other end is connected to the output end of the energy storage high-voltage box; A second battery cluster loop includes a second balancing relay, one end of the second battery cluster loop is connected to the second battery pack, and the other end is connected to the output end of the energy storage high-voltage box; a battery management main control board, configured to control the first balancing relay and the second balancing relay to be closed when the voltage difference between the first battery cluster circuit and the second battery cluster circuit exceeds a preset voltage difference, so as to balance the voltage of the first battery cluster circuit with the voltage of the second battery cluster circuit; Wherein, the battery management main control board is connected to the first battery cluster circuit and the second battery cluster circuit respectively; The first battery cluster loop includes a first battery cluster positive electrode unit and a first battery cluster negative electrode unit, the second battery cluster loop includes a second battery cluster positive electrode unit and a second battery cluster negative electrode unit, the first battery cluster negative electrode unit and the second battery cluster negative electrode unit both include a shunt or a current sensor, and when the first battery cluster negative electrode unit or the second battery cluster negative electrode unit includes a shunt, the other one includes a current sensor, wherein the first end of the shunt is connected to the positive electrode of the first battery cluster or the positive electrode of the second battery cluster, the first end of the current sensor is connected to the positive electrode of the first battery cluster or the positive electrode of the second battery cluster, and the common point of the second end of the shunt and the second end of the current sensor is connected to the negative electrode of the output end of the energy storage high-voltage box.

2. The energy storage high-voltage box according to claim 1, characterized in that: The first end of the positive electrode unit of the first battery cluster is connected to the positive electrode of the first battery cluster, the second end of the positive electrode unit of the first battery cluster is connected to the positive electrode of the output end of the energy storage high-voltage box through the first balancing relay, the first end of the negative electrode unit of the first battery cluster is connected to the negative electrode of the first battery cluster, the second end of the negative electrode unit of the first battery cluster is connected to the negative electrode of the output end of the energy storage high-voltage box, the first end of the positive electrode unit of the second battery cluster is connected to the positive electrode of the second battery cluster, the second end of the positive electrode unit of the second battery cluster is connected to the positive electrode of the output end of the energy storage high-voltage box through the second balancing relay, the first end of the negative electrode unit of the second battery cluster is connected to the negative electrode of the second battery cluster, and the second end of the negative electrode unit of the second battery cluster is connected to the negative electrode of the output end of the energy storage high-voltage box.

3. The energy storage high-voltage box according to claim 2, characterized in that: The first battery cluster positive electrode unit also includes a first fuse and a first positive electrode relay. The first end of the first fuse is connected to the positive electrode of the first battery cluster as the first end of the positive electrode unit of the first battery cluster, the common contact point of the first end of the first positive electrode relay and the first end of the first balancing relay is connected to the second end of the first fuse, and the common contact point of the second end of the first positive electrode relay and the first end of the first balancing relay is connected to the positive electrode of the output end of the energy storage high-voltage box as the second end of the positive electrode unit of the first battery cluster.

4. The energy storage high-voltage box according to claim 3, characterized in that: The second battery cluster positive electrode unit also includes a second fuse and a second positive electrode relay. The first end of the second fuse is connected to the positive electrode of the second battery cluster as the first end of the positive electrode unit of the second battery cluster, the common contact point of the first end of the second positive electrode relay and the first end of the second balancing relay is connected to the second end of the second fuse, and the common contact point of the second end of the second positive electrode relay and the first end of the second balancing relay is connected to the positive electrode of the output end of the energy storage high-voltage box as the second end of the positive electrode unit of the second battery cluster.

5. The energy storage high-voltage box according to claim 3, characterized in that: The first battery cluster positive electrode unit further includes a first balancing resistor, a first end of the first balancing resistor is connected to a first end of the first fuse and a first end of the first positive relay, and a second end of the first balancing resistor is connected to a first end of the first balancing relay.

6. The energy storage high-voltage box according to claim 4, characterized in that: The second battery cluster positive electrode unit further includes a second balancing resistor, a first end of the second balancing resistor is connected to the first end of the second fuse and the first end of the second positive relay, and a second end of the second balancing resistor is connected to the first end of the second balancing relay.

7. The energy storage high-voltage box according to claim 4, characterized in that: The energy storage high voltage box also includes a total negative relay, The common point of the second end of the shunt or current sensor of the negative electrode unit of the first battery cluster and the second end of the shunt or current sensor of the negative electrode unit of the second battery cluster is connected to the first end of the total negative relay, and the second end of the total negative relay is connected to the negative output terminal of the energy storage high-voltage box.

8. The energy storage high-voltage box according to claim 7, characterized in that: The energy storage high-voltage box also includes an isolating switch, the second end of the total negative relay is connected to the second end of the isolating switch, the common contact of the second end of the first positive relay, the second end of the first balancing relay, the second end of the second balancing relay and the second end of the second positive relay is connected to the first end of the isolating switch, the third end of the isolating switch is connected to the positive output end of the energy storage high-voltage box, and the fourth end of the isolating switch is connected to the negative output end of the energy storage high-voltage box.

9. The energy storage high-voltage box according to claim 1, characterized in that: The current sensor is connected to the CANH pin and the CANL pin of the battery management main control board through CAN communication, and the shunt is connected to the GPIO pin of the battery management main control board.

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