Collector box and energy storage system

Abstract

To provide a current collecting box which is easily operated by an operator.SOLUTION: The present application provides a collector box and an energy storage system, the collector box includes a box body and a door, the box body is provided with a mounting cavity, and the door is connected to the box body. The box body includes a first side wall provided opposite to the door. An arrangement direction of the small door and the first side wall is a first direction. The electrical element assembly is mounted in the mounting cavity, and the electrical element assembly includes a positive electrode portion and a negative electrode portion spaced apart from each other, and the positive electrode portion and the negative electrode portion are arranged along a first direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This application claims priority from a Chinese application with application number 202421848659.8 filed on July 31, 2024, and an international application with application number PCT / CN2024 / 127461 filed on October 25, 2024, and incorporates by reference all the contents of said applications.

[0002] This application relates to the field of energy storage technology, and in particular to current collection boxes and energy storage systems. [Background technology]

[0003] In the related art, a combiner box is usually used as a bridge between a battery pack and the outside, and the battery pack can be charged and discharged through the combiner box. Summary of the Invention [Problem to be solved by the invention]

[0004] In the related art, a current collecting box typically includes many electrical components, and the electrical components are arranged in a single layer along the length of the current collecting box. As a result, the electrical components at both ends are far apart, the wiring required between the electrical components is long, and the operation is inconvenient for the operator. [Means for solving the problem]

[0005] The present application provides a current collection box, the current collection box comprising: a box body and a door, the box body having a mounting cavity, the door being connected to the box body to cover or expose the mounting cavity, the box body including a first side wall facing the door, and an arrangement direction of the door and the first side wall being a first direction; and an electric element assembly mounted in the mounting cavity, the electric element assembly including a positive electrode portion and a negative electrode portion spaced apart, the positive electrode portion being configured to be electrically connected to the positive electrode output terminal of the external distribution box and to be electrically connected to the positive electrode of the battery pack, the negative electrode portion being configured to be electrically connected to the negative electrode output terminal of the external distribution box and to be electrically connected to the negative electrode of the battery pack, the positive electrode portion and the negative electrode portion being arranged along a first direction.

[0006] The present application further provides an energy storage system, which includes any one of the current collecting boxes described above. [Effects of the Invention]

[0007] In the collector box provided in the present application, the arrangement direction of the door and the first side wall is a first direction, and an electric element assembly is provided in the mounting cavity. The positive and negative electrode parts of the electric element assembly are arranged along the first direction, so that the distance between the electric elements located at both ends is relatively short, shortening the wiring required between the electric elements and facilitating operation by the operator.

[0008] In the energy storage system provided in the present application, by using the above-mentioned current collection box, the distance between the electrical elements located at both ends becomes relatively short, the wiring required between the electrical elements becomes shorter, and operation by the operator becomes easier. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is an exploded view of the current collector box provided herein. [Figure 2] FIG. 2 is a schematic diagram showing the structure of a plate in FIG. [Figure 3] FIG. 2 is a circuit principle diagram of the current collection box provided in the present application. [Figure 4] FIG. 2 is a perspective view of a current collection box provided herein from a first angle without a door. [Figure 5] FIG. 10 is a perspective view of a current collection box provided herein from a second angle without a door. [Figure 6] FIG. 2 is a schematic diagram showing the structure of the door in FIG. [Figure 7] FIG. 10 is a perspective view of the current collection box provided herein from a third angle without the door. [Figure 8] FIG. 10 is a perspective view of the current collection box provided herein from a fourth angle without the door. [Figure 9] FIG. 10 is a perspective view of the current collection box provided herein from a fifth angle without a door. DETAILED DESCRIPTION OF THE INVENTION

[0010] 1 , a current collection box according to an embodiment of the present application includes a box body 10 and a door 11. A mounting cavity 12 is formed in the box body 10. The door 11 is connected to the box body 10 and configured to cover or expose the mounting cavity 12, or configured as an openable / closable box body 10. A plate 20 is provided in the mounting cavity 12. Here, the door 11 may be rotatably connected to the box body 10.

[0011] The box 10 may specifically include a first side wall 13, a second side wall 15, and a third side wall 17, and the first side wall 13, the second side wall 15, and the third side wall 17 define the mounting cavity 12. Here, the second side wall 15 and the third side wall 17 are arranged opposite each other. The first side wall 13 is arranged opposite the door 11 and is located between the second side wall 15 and the third side wall 17, and opposite sides of the first side wall 13 may be connected to the second side wall 15 and the third side wall 17, respectively.

[0012] 4, the box further includes a top wall 18 and a bottom wall 19. As can be seen, the top wall 18 is located at the top of the box 10, and the bottom wall 19 is located at the bottom of the box 10. The top wall 18, the first side wall 13, and the bottom wall 19 are arranged in this order along the height direction of the current collection box. The arrangement direction of the door 11 and the first side wall 13 is a first direction (also referred to as the width direction of the box), and the arrangement direction of the top wall 18 and the bottom wall 19 is a second direction (also referred to as the height direction of the box), with the first direction being perpendicular to the second direction.

[0013] 2, the current collecting box further includes a plate 20. The plate 20 is attached to the mounting cavity 12 of the box body and may be configured to mount an electrical element assembly 14. The plate 20 is provided between the door 11 and the first side wall 13 and is provided opposite the door 11. The first side wall 13, the plate 20, and the door 11 may be arranged along the first direction or the width direction of the current collecting box. Opposite sides of the plate 20 may be connected to the second side wall 15 and the third side wall 17, respectively.

[0014] Because the electrical element assembly 14 includes many electrical elements, if all of the electrical elements were mounted on the same plane, the box would become very large. Therefore, to further reduce the volume of the current collecting box, multiple plates 20 may be used. The multiple plates 20 may be arranged along the first direction or the width direction of the current collecting box. In some embodiments, the plates 20 may be a first plate 21 and a second plate 23 arranged in order along the first direction (also referred to as the width direction of the current collecting box). The first plate 21 and the second plate 23 are both configured to mount the electrical element assembly 14, and the second plate 23 is located between the first plate 21 and the door 11. Along the width direction of the current collecting box, the orthogonal projection of at least a portion of the first plate 21 on the door is above the orthogonal projection of the second plate 23 on the door 11. In the embodiment of the present application, the arrangement direction of the door and the first side wall is a first direction, and an electrical element assembly 14 is provided in the mounting cavity. The positive and negative parts of the electrical element assembly 14 are arranged along the first direction, so that the distance between the electrical elements located at both ends is relatively short, the wiring required between the electrical elements is shortened, and operation by the operator is made easier.

[0015] The plate 20 further includes a third plate 25. The third plate 25 is configured to mount the electric element assembly 14, and the first plate 21 is located closer to the first side wall 13 than the second plate 23 and the third plate 25, the third plate 25 is located closer to the door than the first plate 21 and the second plate 23, and the second plate 23 is located between the first plate 21 and the third plate 25. Along the width direction of the current collection box, an orthogonal projection of at least a portion of the first plate 21 on the door 11 is above an orthogonal projection of the third plate 25 on the door 11. In some embodiments, the first plate 21 may be attached to the first side wall 13. In other embodiments, opposite sides of the first plate 21 may be connected to the second side wall 15 and the third side wall 17, respectively.

[0016] The current collector box further includes an electric element assembly 14. The electric element assembly 14 is disposed within the mounting cavity 12 of the box 10. The electric element assembly 14 may include a positive electrode portion 70 and a negative electrode portion 80, the positive electrode portion 70 and the negative electrode portion 80 being spaced apart, the positive electrode portion 70 being configured to be electrically connected to the positive electrode output terminal of the external distribution box and to be electrically connected to the positive electrode of the battery pack, and the negative electrode portion 80 being configured to be electrically connected to the negative electrode output terminal of the external distribution box and to be electrically connected to the negative electrode of the battery pack.

[0017] Referring to FIG. 3 , in some embodiments, the external distribution box may be multi-group. The collecting box collects current for the external multi-group distribution box and can control the current and / or voltage input to the battery pack. The positive output terminal of the external multi-group distribution box (which may be referred to as B1+...B4+ in FIG. 3 ) can be accessed through a wire harness to the collecting box, thereby electrically connecting the positive output terminal of the external multi-group distribution box, the first circuit breaker 741, the positive fuse, the positive high-voltage relay, and the positive interface in sequence, and the positive interface is electrically connected to the positive electrode of the battery pack. The negative output terminal of the external multi-group distribution box (which may be referred to as B1-...B4- in FIG. 3 ) can be accessed through a wire harness to the collecting box, thereby electrically connecting the negative output terminal of the external multi-group distribution box, the second circuit breaker 743, the negative fuse, the negative high-voltage relay, and the negative interface in sequence, and the negative interface is electrically connected to the negative electrode of the battery pack. In addition, the external multi-group distribution box can electrically connect one electrical element assembly 14 to one battery pack, thereby realizing functions such as charging and discharging the battery pack. In some embodiments, the maximum current of the single-group distribution box may be 112 A or less.

[0018] For example, the external distribution box may be four-group. The four-group distribution box may charge the battery pack after collecting power from the current collecting box in the embodiment of the present application. The current collecting box in the embodiment of the present application may serve as a bridge connecting the battery pack to the outside, and the current collecting box may be used to charge and discharge the battery pack.

[0019] In some embodiments, the positive electrode portions 70 and the negative electrode portions 80 are arranged along a first direction (also referred to as the width direction of the current collector box). In these embodiments, arranging the positive electrode portions 70 and the negative electrode portions 80 along the first direction results in a more suitable layout, a more compact structure, and a smaller footprint for the current collector box.

[0020] 9, the positive electrode unit 70 may specifically include a positive electrode fuse 71, a positive electrode high-voltage relay 72, and a positive electrode interface 73. The positive electrode fuse 71, the positive electrode high-voltage relay 72, and the positive electrode interface 73 are electrically connected in sequence, with the positive electrode fuse 71 being electrically connected to the positive electrode output terminal of an external distribution box, and the positive electrode interface 73 being electrically connected to the positive electrode of the battery pack. In this embodiment, the positive electrode unit 70 includes the positive electrode fuse 71, which can be blown out in a timely manner when the current exceeds a predetermined value, thereby protecting the circuit safety of the positive electrode unit 70.

[0021] The electric element assembly 14 further includes a circuit breaker 74. The circuit breaker 74 includes a first circuit breaker 741. The first circuit breaker 741 is provided in the mounting cavity 12. In the embodiment of the present application, the first circuit breaker 741 is electrically connected to the positive electrode portion 70, so that the first circuit breaker 741 can be turned off in a timely manner to protect the circuit when a safety hazard occurs. Furthermore, the first circuit breaker 741 and the positive electrode portion 70 are arranged along the first direction, and the first side wall 13 is located closer to the first circuit breaker 741 than the positive electrode portion 70 and the negative electrode portion 80, resulting in a compact structure and a suitable layout.

[0022] Referring to FIG. 8 , the negative electrode unit 80 may specifically include a negative electrode fuse 81, a negative electrode high-voltage relay 82, and a negative electrode interface 83. The negative electrode fuse 81, the negative electrode high-voltage relay 82, and the negative electrode interface 83 are electrically connected in sequence, with the negative electrode fuse 81 electrically connected to the negative electrode output terminal of the external distribution box, and the negative electrode interface 83 electrically connected to the negative electrode of the battery pack. In this embodiment, the negative electrode unit 80 includes a negative electrode fuse that can be blown out in a timely manner when the current exceeds a predetermined value, thereby protecting the circuit safety of the negative electrode unit 80. The positive electrode unit 70 and the negative electrode unit 80 each have their own independent fuses, which can protect the positive electrode unit 70 and the negative electrode unit 80 and improve the circuit safety.

[0023] The circuit breaker 74 further includes a second circuit breaker 743. The second circuit breaker 743 is disposed within the mounting cavity 12, electrically connected to the negative electrode portion 80, and aligned with the negative electrode portion 80 in the first direction. In the embodiment of the present application, the second circuit breaker 743 is electrically connected to the negative electrode portion 80, so that the second circuit breaker 743 is turned off in a timely manner in the event of a safety hazard, thereby protecting the safety of the circuit. Furthermore, the second circuit breaker 743 may be located closer to the first side wall 13 than the positive electrode portion 70 and the negative electrode portion 80.

[0024] Specifically, the first circuit breaker 741, the positive fuse 71, the positive high-voltage relay 72, and the positive interface 73 are electrically connected in sequence, with the positive interface electrically connected to the positive electrode of the battery pack, and the first circuit breaker 741 electrically connected to the positive output terminal of the external distribution box. The second circuit breaker 743, the negative fuse 81, the negative high-voltage relay 82, and the negative interface 83 are electrically connected in sequence, with the negative interface electrically connected to the negative electrode of the battery pack, and the second circuit breaker 743 electrically connected to the negative output terminal of the external distribution box. In this embodiment, the first circuit breaker 741 and the second circuit breaker 743 are configured to turn on and off the entire high-voltage circuit. Specifically, the first circuit breaker 741 is configured mainly to turn on and off the positive portion, and the second circuit breaker 743 is configured mainly to turn on and off the negative portion. The first circuit breaker 741 and the second circuit breaker 743 work together to turn the entire high voltage circuit on and off.

[0025] If the first circuit breaker 741 is provided only in the positive electrode unit 70, even if the first circuit breaker 741 is turned off, the negative electrode of the battery pack may have a high voltage due to an accidental situation such as reverse connection or a lightning strike, which may result in damage to the battery pack via the negative electrode path or a safety hazard. If the second circuit breaker 743 is provided only in the negative electrode unit 80, even if the second circuit breaker 743 is turned off, the positive electrode unit 70 may still be in a high voltage state, which may result in a safety hazard. In this embodiment, the first circuit breaker 741 is connected to the positive output terminal of the distribution box in the positive electrode unit 70, and the second circuit breaker 743 is connected to the negative output terminal of the distribution box in the negative electrode unit 80, which further protects the circuit.

[0026] In the embodiment of the present application, both the positive electrode part 70 and the negative electrode part 80 are provided with fuses, and both the positive electrode part 70 and the negative electrode part 80 are connected to circuit breakers, thereby protecting both the positive electrode part 70 and the negative electrode part 80 and increasing the safety of the circuit. Here, the first electric element assembly 14 further includes a first copper bar 701 and a second copper bar 801, and the positive electrode part 70 is electrically connected to the positive output terminal of the external distribution box by the first copper bar 701, and the negative electrode part 80 is electrically connected to the negative output terminal of the external distribution box by the second copper bar 801, thereby reducing the amount of heat generated.

[0027] The first copper bar 701 may be attached to the first plate 21, and the second copper bar 801 may be attached to the first plate 21, with the second copper bar 801 spaced apart from the first copper bar 701, so that the first copper bar 701 is convenient for connecting the positive electrode part 70 and the positive output terminal of the external distribution box respectively, and the second copper bar 801 is convenient for connecting the negative electrode part 80 and the negative output terminal of the external distribution box respectively, resulting in a compact structure.

[0028] In some embodiments, the first copper bar 701 may specifically include a cluster high-voltage positive connection copper bar 75 and a cluster high-voltage positive-circuit breaker copper bar 76. The second copper bar 801 may specifically include a cluster high-voltage negative connection copper bar 85 and a cluster high-voltage negative-circuit breaker copper bar 86. The positive output terminal of the distribution box may be connected to the cluster high-voltage positive connection copper bar 75 by a wiring harness and to the first circuit breaker 741 by the cluster high-voltage positive-circuit breaker copper bar 76. The first circuit breaker 741 is electrically connected to the positive fuse 71 by a circuit breaker output positive copper bar portion 77, the positive fuse 71 is connected to the positive high-voltage relay 72 by a copper bar, and the positive high-voltage relay 72 is connected to the positive output wiring harness by an output wiring harness copper bar, and the positive output wiring harness is connected to the positive interface 73. The circuit breaker output positive electrode copper bar portion 77 may be attached to the side of the second plate 23 facing the door 11 .

[0029] The negative output terminal of the distribution box is connected to the cluster high-voltage negative connection copper bar 85 by a wiring harness and to the second circuit breaker 743 by the cluster high-voltage negative-circuit breaker copper bar 86. The circuit breaker-output negative copper bar portion 87 is electrically connected to the negative fuse 81, so that the negative fuse 81 is connected to the negative high-voltage relay 82 by a copper bar, and the negative high-voltage relay 82 is connected to the negative output wiring harness by a copper bar, and the negative output wiring harness is connected to the negative interface 83. The circuit breaker-output negative copper bar portion 87 may be attached to the side of the third plate 25 facing the door 11.

[0030] 7, a pre-charge resistor 91 may be further provided to protect the fuse and relay from an excessive charging current at the moment of energization and to avoid damage to the fuse and switching devices such as the relay due to a momentary large current. The pre-charge resistor 91 is attached to the side of the first plate 21 facing the second plate 23.

[0031] In some embodiments, the circuit breakers 74 (including the first circuit breaker 741 and the second circuit breaker 743) may be attached to the first plate 21 on a side closer to the door 11, the positive electrode portion 70 may be attached to the second plate 23 on a side closer to the door 11, and the negative electrode portion 80 may be attached to the third plate 25 on a side closer to the door 11. In these embodiments, a plurality of plates 20 are provided, and the circuit breakers 74, the positive electrode portion 70, and the negative electrode portion 80 are attached to different plates, thereby realizing that the circuit breakers 74, the positive electrode portion 70, and the negative electrode portion 80 are arranged along the first direction.

[0032] In some embodiments, in addition to the positive electrode portion 70 and the negative electrode portion 80, the electrical element assembly 14 further includes a control portion 100. The control portion 100 is configured to be mounted in the mounting cavity 12 and to be electrically connected to the positive electrode portion 70, the negative electrode portion 80, and the battery pack. The control portion 100 is further configured to be electrically connected to a communication signal terminal of the external distribution box to detect the status of the external distribution box and the battery pack.

[0033] In the related art, energy storage systems typically include a current collection box in the form of an independent equipment box, which collects current from an external distribution box. However, because the function of the current collection box is relatively single, control of input or output current and voltage must be achieved by an electric control box in the form of another independent equipment box, which takes up a relatively large amount of space. In the embodiment of the present invention, the electric element assembly 14 mounted within the box includes a positive electrode part, a negative electrode part, and a control part. The positive electrode part and the negative electrode part of the external distribution box are respectively connected to the positive and negative electrodes of the battery pack, and the positive electrode part and the negative electrode part are used to collect current. The control part is electrically connected to the communication signal terminals of the external distribution box, and the status of the external distribution box and the battery pack are detected, making the current collection box more versatile. Furthermore, compared to the related art solution in which the control unit is provided in one independent housing and the positive and negative electrode units are provided in other independent housings, in the embodiments of the present invention, the control unit is provided in the same housing together with the positive and negative electrode units, and the control unit and positive electrode unit are arranged along the length or width direction of the current collecting box, thereby eliminating the need for a single housing and making the structure between the control unit and the positive and negative electrode units more compact.

[0034] In the embodiment of the present application, the control unit 100 is provided within the box and is configured to be electrically connected to the communication signal terminal of the external distribution box, which has the following advantages. First, the communication signal terminal of the external distribution box can supply power to the control unit. Second, the communication signal terminal of the external distribution box can detect the status of the external distribution box and the battery pack in real time. If a fault occurs in the distribution box, the communication signal terminal can provide feedback to the collection box, which can then provide feedback from the collection box to the control base. Third, the communication signal terminal can detect and provide feedback to the status of the battery pack in real time, such as the operating voltage, operating current, remaining charge, and remaining battery life of the battery system. Compared to related art solutions in which an energy storage system includes an electrical control box and a collection box, which are typically provided in the form of independent equipment boxes, the collection box provided in the embodiment of the present application is more versatile, has a compact structure, and occupies less space.

[0035] The distribution box group outside the current collector box may specifically include a positive output terminal, a negative output terminal, and a communication signal terminal. A wire entrance 90 configured to allow access to an external wiring harness may be opened in the side wall of the box. The wire entrance 90 specifically includes a positive wire entrance, a negative wire entrance, and a communication wire entrance. A high-voltage wiring harness connected to the distribution box may be attached to the wire entrance 90 via a cable gland. The wire harness passed through the cable gland is locked, thereby increasing the level of protection for the box. This prevents foreign objects and moisture from entering the current collector box, which could lead to breakdowns and short circuits.

[0036] The communication signal terminal passes through a communication wire inlet opened in the side wall of the box to enter the box and is connected to the BMS control component 31. The positive output terminal of the external distribution box passes through a positive wire inlet opened in the side wall of the box to enter the box, is connected to the first copper bar 701, and has access to the first circuit breaker 741. The negative output terminal passes through a negative wire inlet opened in the side wall of the box to enter the box, is connected to the second copper bar 801, and has access to the second circuit breaker 743.

[0037] In some embodiments, the control unit 100 and the positive electrode unit 70 may be arranged along the length of the current collecting box, and the positive electrode unit 70 and the negative electrode unit 80 may be arranged along the width of the current collecting box, i.e., along the first direction, which results in a more compact structure and occupies less space.

[0038] In some embodiments, the control unit 100 includes a first sub-control unit 101 and a second sub-control unit 103, and the first sub-control unit 101, the positive electrode unit 70, and the second sub-control unit 103 are arranged in order along the length of the current collecting box. In these embodiments, two control units 100 are arranged, and the first sub-control unit 101 and the second sub-control unit 103 are located on either side of the positive electrode unit 70 and the negative electrode unit 80, respectively. Here, the first sub-control unit 101 may be specifically attached to the second side wall 15, and the second sub-control unit 103 may be specifically attached to the third side wall 17.

[0039] In some embodiments, the second sub-controller 103 of the controller 100 includes a BMS control component 31. The BMS control component 31 is configured to be electrically connected to a communication signal terminal of an external distribution box. The BMS control component 31 is electrically connected to the positive terminal 70 and the negative terminal 80, respectively.

[0040] In some embodiments, the electrical element assembly 14 further includes an adjustment indicator 200. The adjustment indicator is attached to the side of the door 11 away from the mounting cavity 12, and the adjustment indicator 200 is electrically connected to the BMS control component 31 and configured to adjust and indicate the operating status of the battery pack.

[0041] In the embodiment of the present application, there may be a plurality of electric element assemblies 14. As can be seen from the above description of the specific structure of the electric element assemblies 14, each of the plurality of electric element assemblies 14 includes the above-mentioned positive electrode part 70, negative electrode part 80, control part, etc., and a detailed description thereof will be omitted here.

[0042] Each electric element assembly 14 is configured to be electrically connected to an external multi-group distribution box and to one battery pack. The multiple electric element assemblies 14 are arranged from top to bottom along the height direction of the current collecting box. Therefore, one current collecting box according to the embodiment of the present application can simultaneously collect current from multiple battery packs, resulting in a small footprint, ease of use, and low cost.

[0043] In an embodiment of the present invention, one electric element assembly 14 is configured to be electrically connected to an external multi-group distribution box and also configured to be electrically connected to one battery pack, thereby realizing power collection from the one electric element assembly 14 to the external multi-group distribution box, and the external multi-group distribution box charges and discharges for the one battery pack after collecting power from the one electric element assembly 14. By providing multiple electric element assemblies 14 configured to be electrically connected to multiple battery packs in one box, the power collection requirements of the multiple battery packs are met, thereby improving the situation in the related art where it is difficult for a power collection box to meet the power collection requirements of the multiple battery packs.

[0044] In some embodiments, for convenience of explanation, the plurality of battery packs includes at least a first battery pack and a second battery pack, and the plurality of electric element assemblies 14 includes at least a first electric element assembly 14 and a second electric element assembly 14. The mounting cavity of the box body includes a first mounting cavity 121 and a second mounting cavity 123 arranged from top to bottom along the height direction of the current collection box.

[0045] The first electrical element assembly 14 is mounted in the first mounting cavity 121 and electrically connected to an external distribution box and electrically connected to the first battery pack, which may be multiple groups. The second electrical element assembly 14 is mounted in the second mounting cavity 123 and electrically connected to the external distribution box and electrically connected to the second battery pack, which may be multiple groups.

[0046] In some embodiments, a single battery pack may be connected to a four-group distribution box. An eight-group external distribution box may exist, and the first electrical element assembly 14 may be configured to collect power from the external four-group distribution box for charging the first battery pack. The second electrical element assembly 14 may be configured to collect power from another four-group external distribution box for charging the second battery pack. In some embodiments, the use of a single distribution box simultaneously satisfies both high-voltage collection and low-voltage control for two or more battery packs, resulting in a smaller footprint, ease of use, and lower cost.

[0047] 4, the first mounting cavity 121 may include a first mounting space 1211 and a second mounting space 1213 arranged along the height direction of the current collecting box. Specifically, in the first mounting cavity 121, an orthogonal projection of at least a portion of the first plate 21 on the door (or the first side wall) is located above an orthogonal projection of the second plate 23 on the door 11 (or the first side wall) along the width direction of the current collecting box. An orthogonal projection of at least a portion of the first plate 21 on the door is located above an orthogonal projection of the third plate 25 on the door 11 along the width direction of the current collecting box. This allows at least a portion of the first plate 21 to directly face the door 11, forming the first mounting space 1211.

[0048] A portion of the first plate 21 forms a second mounting space 1213 with the second plate 23 and the third plate 25, and the second mounting space 1213 may specifically include a first sub-mounting cavity, a second sub-mounting cavity, and a third sub-mounting cavity. A portion of the first plate 21 defines the first sub-mounting cavity with the second plate 23, the second plate 23 defines the second sub-mounting cavity with the third plate 25, and the third plate 25 defines the third sub-mounting cavity with the door. At least a portion of the first circuit breaker 741 is mounted in the first mounting space 1211, and at least a portion of the second circuit breaker 743 is mounted in the first mounting space 1211.

[0049] Specific embodiments of the above are as follows. Opposite sides of the first plate 21 may be connected to the second side wall and the third side wall, respectively, by welding, screwing, etc. Opposite sides of the second plate 23 may be connected to the second side wall and the third side wall, respectively, by welding, screwing, etc. Opposite sides of the third plate 25 may be connected to the second side wall and the third side wall, respectively, by welding, screwing, etc. In this way, the first plate 21, the second plate 23, and the third plate 25 are attached to the box body. This makes the structure more compact, reducing the volume and occupied space of the box body.

[0050] Regarding the specific positional relationship of the first plate 21, the second plate 23 and the third plate 25 in the second mounting cavity 123, reference may be made to the specific positional relationship thereof in the first mounting cavity 121.

[0051] In some embodiments, each of the plurality of electric element assemblies 14 includes the above-described positive electrode part 70 and negative electrode part 80, the positive electrode part 70 is electrically connected to the positive electrode output terminal of the external distribution box and is configured to be electrically connected to the positive electrode of one battery pack, and the negative electrode part 80 is electrically connected to the negative electrode output terminal of the external distribution box and is configured to be electrically connected to the negative electrode of the battery pack. In this way, one electric element assembly 14 can correspond to one battery pack, and multiple electric element assemblies 14 can correspond to multiple battery packs, so that the electric element assemblies 14 and the battery packs may have a one-to-one correspondence.

[0052] Referring to FIG. 3, since multiple groups of distribution boxes are accessed, the overcurrent withstand capacity of one positive electrode interface and one negative electrode interface working together cannot meet usage requirements. Therefore, multiple positive electrode parts 70 and multiple negative electrode parts 80 are provided, where the positive electrode parts 70 and the negative electrode parts 80 correspond one-to-one. That is, each of the multiple electric element assemblies 14 includes multiple positive electrode parts 70 and multiple negative electrode parts 80. Therefore, each of the multiple electric element assemblies 14 includes multiple positive electrode interfaces (which may refer to charging cradle 1DC+ in FIG. 3 and charging cradle 2DC+ in FIG. 3) and multiple negative electrode interfaces (which may refer to charging cradle 1DC- in FIG. 3 and charging cradle 2DC- in FIG. 3), where the positive electrode interfaces and the negative electrode interfaces work together in one-to-one correspondence, and one positive electrode interface and one negative electrode interface work together to form one charging and discharging interface. The multiple positive electrode parts 70 are each electrically connected to the positive electrode of one battery pack, and the multiple negative electrode parts 80 are each electrically connected to the negative electrode of the battery pack, and by providing multiple positive electrode parts 70 and multiple negative electrode parts 80, a larger current can be provided for one battery pack.

[0053] In some embodiments, since the maximum current input from the four-group distribution box is about 448 A and the overcurrent capacity of a single charging / discharging interface is about 250 A, two positive pole sections 70 and two negative pole sections 80 are provided, which are configured to share the current to meet the overcurrent requirements.

[0054] In some embodiments, for ease of use by users, the control unit 100 may be divided into two battery packs. Each of the multiple electric element assemblies 14 includes a control unit 100. The control unit is configured to be electrically connected to the electric element assembly 14 and to be electrically connected to the battery pack. The control unit is further configured to be electrically connected to a communication signal terminal of the external distribution box to detect the status of the external distribution box and the battery pack. This allows one control unit to control one battery pack, thereby increasing the accuracy of control.

[0055] In some embodiments, the control unit may include a first control unit and a second control unit. The first control unit is mounted in the first mounting cavity 121, and the second control unit is mounted in the second mounting cavity 123. The first control unit is electrically connected to the first battery pack and the first electric element assembly 14, respectively, and detects the status of the external distribution box and the first battery pack. The second control unit is electrically connected to the second battery pack and the second electric element assembly 14, respectively, and detects the status of the external distribution box and the second battery pack.

[0056] The first and second control units control the first and second battery packs individually, respectively, so that the control units of the two battery packs are independent of each other and do not interfere with each other, reducing the failure rate and increasing the accuracy of control.

[0057] In some embodiments, in each electrical element assembly 14, the control unit includes two parts, a first sub-control unit 101 and a second sub-control unit 103, which are electrically connected to each other. Along the length of the box, the first sub-control unit and the second sub-control unit may be located on either side of the box, specifically attached to the second side wall and the third side wall, respectively.

[0058] Specifically, the second sub-controller is attached to the third side wall of the box body on the side facing the second side wall of the box body. The second side wall of the box body is on the left side of the box body, and the first sub-controller is attached to the second side wall of the box body on the side facing the third side wall of the box body.

[0059] In some embodiments, along the width direction of the current collecting box, the orthogonal projection of the first sub-control unit 101 on the first side wall is above the orthogonal projection of the second plate on the first side wall.

[0060] In some embodiments, the orthogonal projection of the second sub-control section 103 on the first side wall is above the orthogonal projection of the second plate on the door.

[0061] In some embodiments, along the width direction of the current collecting box, the orthogonal projection of the first sub-controller 101 on the first side wall is above the orthogonal projection of the second plate on the first side wall, and the orthogonal projection of the second sub-controller on the first side wall is above the orthogonal projection of the second plate on the door.

[0062] 5 and 6, the first sub-controller is configured to control the indicator light module 41 and the switch module 43. The first sub-controller may include a signal relay 33, an air switch 35, a wiring groove 36, a connection terminal 37, an AC / DC power supply 38, etc. The second sub-controller 103 may include a BMS control component 31. The communication signal terminal may supply power to the controller via an AC / DC power supply in the current collection box.

[0063] Specifically, in the first mounting space 1211, a first bracket plate may be attached to the second side wall of the box body on the side facing the third side wall of the box body. The first sub-control unit is attached to this first bracket plate and is attached to the second side wall by this first bracket plate. A second bracket plate may be attached to the third side wall of the box body on the side facing the second side wall of the box body. The second sub-control unit is attached to this second bracket plate and is attached to the third side wall by this bracket plate.

[0064] In some specific embodiments, the BMS control component 31 is attached to the second bracket plate, configured to manage the batteries, and attached to the third side wall by the second bracket plate. Communication signal terminals of the external distribution box may pass through the wire entrance into the collection box to access the BMS control component 31. Similarly, multiple BMS battery management systems may be configured, with one BMS battery management system configured to control one battery system. In some embodiments, two battery systems may be configured, with two BMS battery management systems configured, each capable of managing two battery systems.

[0065] Specifically, a guide rail may be attached to the first bracket plate. The connection terminal 37, the signal relay 33, and the air switch 35 are all attached to the guide rail and configured to be attached to the guide rail by clips. The AC / DC power supply 38 is attached to the first bracket plate.

[0066] In some specific embodiments, the indicator light and the switch may be mounted on the door and located on the outer side of the door away from the mounting cavity. The indicator light and the switch are connected to the connection terminals via a wire harness, and the connection terminals are connected to the signal relay and the air switch via the wire harness. The wire harness may be gathered in a wiring groove and connected to the BMS control component 31, and the BMS control component 31 outputs a signal to the control platform via the wire harness.

[0067] In some embodiments, each first electrical element assembly 14 further includes an auxiliary electrical unit 300. The auxiliary electrical unit 300 may be attached to the second plate 23 and the third plate 25 and may include an auxiliary electrical positive fuse 301, an auxiliary electrical negative fuse 303, an auxiliary electrical positive interface 305, and an auxiliary electrical negative interface 307. The auxiliary electrical positive fuse 301 and the auxiliary electrical positive interface 305 may be attached to the second plate 23, and the auxiliary electrical negative fuse 303 and the auxiliary electrical negative interface 307 may be attached to the third plate 25. Here, the first circuit breaker 741, the auxiliary electrical positive fuse 301, and the auxiliary electrical positive interface 305 are electrically connected in sequence, and the auxiliary electrical positive is configured to be electrically connected to the positive pole of the auxiliary power box.

[0068] The second circuit breaker 743, the auxiliary negative pole fuse 303 and the auxiliary negative pole interface 307 are electrically connected in sequence, and the auxiliary negative pole is configured to be electrically connected to the negative pole of the auxiliary power box.

[0069] The auxiliary positive and negative interface 305 and 307 are configured to be connected to an auxiliary power box and are further configured to charge the auxiliary power box. Furthermore, the auxiliary positive and negative fuses 301 and 303 are configured to meet the requirement of individually arranging fuses on each side.

[0070] Specifically, the positive output terminal of the distribution box is connected to the cluster high-voltage positive connection copper bar by a wire harness, and is connected to the circuit breaker by the cluster high-voltage positive-circuit breaker copper bar, the circuit breaker is connected to the auxiliary electric positive fuse 301, the auxiliary electric positive fuse 301 is connected to the auxiliary electric positive output wire harness by the auxiliary electric positive copper bar, and the auxiliary electric positive output wire harness is connected to the auxiliary electric positive interface 305.

[0071] The negative output terminal of the distribution box is connected to the cluster high-voltage negative connection copper bar by a wire harness, and is connected to the circuit breaker by the cluster high-voltage negative-circuit breaker copper bar, the circuit breaker is connected to the auxiliary electric negative fuse 303, and the auxiliary electric negative fuse 303 is connected to the auxiliary electric negative output wire harness by the auxiliary electric negative copper bar, and the auxiliary electric negative output wire harness is connected to the auxiliary electric negative interface 307.

[0072] In some embodiments, each first electrical element assembly 14 further includes a surge protector 400. The surge protector 400 may be attached to the second plate 23. The surge protector 400 includes a first surge fuse 401, a surge protector 405, and a second surge fuse 403. The first circuit breaker 741, the first surge fuse, the surge protector, the second surge fuse, and the second circuit breaker 743 are electrically connected in sequence to form an anti-surge protection circuit. The provision of the anti-surge protection circuit is configured to protect equipment from damage caused by lightning strikes.

[0073] Specifically, the first circuit breaker 741 is electrically connected to the circuit breaker output positive copper bar portion, the second circuit breaker 743 is electrically connected to the circuit breaker output negative copper bar portion, one end of a first surge fuse is connected to the circuit breaker output positive copper bar portion by a wiring harness so that the first surge fuse is electrically connected to the first circuit breaker 741. The other end of the first surge fuse is connected to a surge protector, one end of the surge protector is connected in series to a second surge fuse by a wiring harness, and the second surge fuse is connected to the circuit breaker output negative copper bar portion by a wiring harness so that the second surge fuse is electrically connected to the second circuit breaker 743. The circuit breaker output positive copper bar portion may be attached to the side of the second plate 23 facing the door. The circuit breaker output negative copper bar portion may be attached to the side of the third plate 25 facing the door.

[0074] In some embodiments, a guide rail and an insulating post may be attached to the second plate 23. To improve the efficiency and stability of the installation, the guide rail is configured to fix the surge protector. The first surge fuse and the second surge fuse are fixed to the insulating post of the bracket plate.

[0075] 8, in some embodiments, a manhole may be drilled in the plate. The manhole may be a west manhole 201, and if the wiring harness becomes loose, the outer layer can be directly reinforced without removing the plate close to the door, thus facilitating reinforcement and maintenance.

[0076] In some embodiments, the plate may be covered with a PC film to improve its insulating properties, particularly on the side of the plate facing the door.

[0077] In some embodiments, an insulating plate 603 may be attached to the side away from the door to increase the electrical gap between the copper bars and improve the insulating performance, where the insulating plate 603 may be an acrylic insulating plate.

[0078] In some embodiments, each first electrical element assembly 14 further includes an adjustment indicator attached to the side of the door away from the mounting cavity and configured to adjust and indicate the operating status of one battery pack.

[0079] The adjustment instruction unit 200 may include a first operation module 40, a second operation module 50, and an alert module 60. The first operation module 40, the second operation module 50, and the alert module 60 are arranged in order from top to bottom along the height direction of the box body.

[0080] Here, the first operation module is configured to display and give instructions regarding the operating status of the first battery pack, and the second operation module is configured to display and give instructions regarding the operating status of the second battery pack.

[0081] In this embodiment, the first and second battery packs are grouped in the control unit, so that when a fault occurs, it is possible to directly identify which group of battery packs has the fault and turn off the input and output of the battery packs in a timely manner, thereby avoiding major losses. This enables the status of the distribution boxes of the two battery packs to be monitored, and the communication of the entire two battery systems can be integrated and output to the control board.

[0082] Next, the first operation module 40 will be described. The first operation module 40 includes an indicator light module 41, a switch module 43, a chime 45, and a display module 47, and provides timely feedback and control of the status of the first battery pack. The indicator light module 41 and the switch module 43 are each electrically connected to the control unit.

[0083] Here, the display module 47 is provided on one side of the connection between the door and the box body and on the other side of the connection between the door and the box body. The display module 47 is provided on the door, and the indicator light module 41 and the display module 47 are provided on the door with a gap between them.

[0084] The indicator light module 41 may include an operation indicator light 411, a fault indicator light 413, a switch-on indicator light 415, an overheat indicator light 412, a 24V voltage indicator light 414, and a low SOC indicator light 416. The indicator light modules 41 are arranged in two parallel rows, with the first row including the operation indicator light, the fault indicator light, and the switch-on indicator light, and the second row including the overheat indicator light, the 24V power indicator light, and the low SOC indicator light. By arranging the indicator light modules 41 in two parallel rows, the structure between the first row of indicator light modules 41 and the second row of indicator light modules 41 is compact, which makes it easier for the operator to operate.

[0085] The switch module 43 may include a remote / local control switch 431, an on / off control switch 433, and a mute control switch 435. The remote / local control switch 431, the on / off control switch 433, and the mute control switch 435 are arranged in a single row and are configured to be arranged in parallel with the indicator light module. This results in the indicator light module 41 and the switch module 43 being arranged in parallel, with the first row of indicator light modules 41, the second row of indicator light modules 41, and the switch module 43 arranged from top to bottom, making the switch module 43 and indicator light module 41 compact. The first row of indicator light modules 41 is located higher than the display module 47, and a mounting space is provided between the side of the first row of indicator light modules 41 facing the display module and the display module. A chime and emergency stop switch 437 are mounted in this mounting space, making them easier for the operator to operate and less likely to be accidentally touched. Here, the chime is located near the first row of the indicator light module 41 and above the display module, and the emergency stop switch is located between the chime and the display module 47.

[0086] The display module 47 is mounted on the door and configured to display relevant parameters and operating status. The display modules 47 are grouped with the first and second battery packs, so that the display modules 47 of the two battery packs are independent of each other and do not interfere with each other. The two display modules 47 on the door can monitor the battery status of the two battery systems. In some embodiments, both display modules 47 may be touch displays.

[0087] The structure and effect of the second operation module may refer to the first operation module. The second operation module is configured to display and control the operating status of the second battery pack. The first operation module may be opened separately to expose its internal structure, and the second operation module may be opened separately to expose its internal structure. At the same time, the entire door may be opened, or the entire door may be opened using the handle after the box lock is opened.

[0088] The alert module 60 includes a marking component and a box lock. The ventilation component is located near the bottom of the door, and the marking component is located between the ventilation component, the box lock, and the second operation module. The box lock is used to lock the door, and the box marking component may be a high-voltage alert mark.

[0089] In the embodiment of the present application, the first battery pack and the second battery pack are grouped and arranged with low voltage indicator lights and control switches, so that the low voltage indicator light and control switch of each battery pack are independent of the low voltage indicator light and control switch of the other battery pack and do not interfere with each other, and thus the charging and discharging of the two battery packs can be controlled separately.

[0090] In order to improve the heat dissipation effect, in the embodiments of the present application, the collection box may adopt ventilation heat dissipation. In some embodiments, the box 10 has an air outlet 1010 at the top and an air outlet 1030 in the door, where the air inlet 1030 and the air outlet 1010 are respectively connected to the mounting cavity 12, and the air outlet assembly is configured to exhaust gas in the mounting cavity 12 through the air outlet 1010. The electric element assembly 14 is installed in the mounting cavity 12 and configured to collect current from multiple external distribution boxes, and at least a portion of the electric element assembly 14 is located in the air path between the air inlet 1030 and the air outlet 1010. In these embodiments, when air passes through the air inlet 1030 and enters the box, heat is generated when the electric element assembly 14 operates, and the heated air rises. Therefore, by passing through the electric element assembly 14, the hot air dissipated by the operation of the electric element assembly 14 can be sufficiently expelled upward, preventing failure of the electric element assembly 14 due to high temperature accumulation. The air inlet 1030 may be opened at a position on the door close to the bottom wall 19.

[0091] In this embodiment, the airflow from the bottom is blown in, while the airflow from the top is advantageous in discharging more hot air, thereby improving the heat dissipation effect. The flowing air dissipates the heat generated by the electrical element assembly 14 and is discharged from the top of the box, and the airflow from the top is advantageous in discharging more hot air, thereby improving the heat dissipation effect.

[0092] In some embodiments, the current collection box further includes an air outlet assembly. The air outlet assembly is disposed within the mounting cavity 12 and is located near the top of the box body. The air outlet assembly is configured to exhaust gas from the box body 10 through the air outlet 1010. Providing the air outlet assembly and the air outlet 1010 at the top can improve heat dissipation efficiency.

[0093] In some embodiments, the blower assembly includes a blower, a first strainer 601, and a second strainer 602. The blower is configured to introduce flowing air into the box to dissipate heat for the components inside the box and to expel gas in the mounting cavity through the outlet 1010, so-called external airflow. The first strainer 601 is attached to the box 10 and configured to cover the outlet 1010. The blower assembly includes a second strainer 602. The second strainer 602 is attached to the door and configured to cover the inlet 1030. Covering the inlet 1030 with the second strainer 602 prevents external gas from entraining particulate matter inside the box and adversely affecting the electrical component assembly 14. Covering the outlet 1010 with the first strainer 601 prevents external dust from passing through the outlet 1010 and entering the box. The blower may be a roots blower, a centrifugal blower, an axial blower, a leaf blower, etc., but the present application is not limited thereto.

[0094] Both the first strainer 601 and the second strainer 602 may be louver strainers. The blower may be a louver fan. The louver fan is connected to the BMS control component 31 by a wire harness, and the on / off of the fan is controlled by a program stored in the BMS control component 31, thereby achieving ventilation and heat dissipation inside the current collection box.

[0095] Here, the air inlet 1030 may adopt a 323mm*323mm louver strainer group. The air outlet 1010 may adopt a combination of two 204mm*204mm louver strainer groups and two 24V DC axial flow fans. This will achieve a protection level of IP55 and an air flow rate of 98m / s. 3 / h can be reached.

[0096] In some embodiments, the louver fan may be connected to the BMS control component 31 by a wire harness. The fan can be controlled to turn on and off by a program stored in the BMS control component 31, thereby achieving ventilation and heat dissipation inside the current collection box.

[0097] In some embodiments, the side of the plate facing the air inlet 1030 is configured to receive the electrical element assembly 14. Along the first direction, an orthogonal projection of at least a portion of the electrical element assembly 14 on the door is above the air inlet 1030 and / or an orthogonal projection of at least a portion of the electrical element assembly 14 on the door is within the air inlet 1030.

[0098] Therefore, the flowing air entering through the air inlet 1030 can pass through the electric element assembly 14 mounted on the plate, which in turn improves the heat dissipation performance.

[0099] In some embodiments, each of the multiple plates may have a through hole that penetrates along the first direction. In these embodiments, each plate has a through hole that penetrates along the first direction, and the through hole may be configured to allow the electrical element assembly 14 to be attached or may be configured as a manhole. Outside air passes through the air intake 1030 and enters between the third plate 25 and the door, then passes through the through holes to enter between the second plate 23 and the third plate 25, and then passes through the through holes to enter between the first plate 21 and the second plate 23, thereby contributing to heat dissipation.

[0100] In the embodiment of the present application, after the external gas enters the box, it may be divided into at least two paths: one path enters between the first plate 21 and the second plate 23 to dissipate a portion of the heat generated from the first electric element assembly 14 mounted on the first plate 21, and the other path enters between the second plate 23 and the door to dissipate a portion of the heat generated from the first electric element assembly 14 mounted on the second plate 23 and discharge it through the outlet provided in the top wall. In other words, two paths of gas simultaneously dissipate heat from the first electric element assembly 14, thereby improving heat dissipation efficiency.

[0101] In some embodiments, along the first direction, the orthogonal projection of at least a portion of the first plate 21 on the door is above the orthogonal projection of the second plate 23 on the door. That is, at least a portion of the first plate 21 directly faces the door to form a cavity, and this cavity is located above the second plate 23 and the third plate 25. In other words, the second plate and the third plate 25 are not provided between at least a portion of the first plate 21 and the door. Therefore, one type of gas that has entered between the first plate 21 and the second plate and one type of gas that has entered between the second plate and the door can merge into the cavity formed when the first plate 21 and the door are directly opposite each other, which can efficiently discharge the gas from the outlet and contribute to heat dissipation.

[0102] The air outlet 1010 is opened in the top wall 18, and an orthogonal projection of at least a portion of the second plate 23 on the top wall 18 along the height direction of the current collection box is located within the air outlet 1010. This makes it easier for the flowing air to be discharged from the air outlet 1010.

[0103] In some embodiments, the box further includes an insulating plate 603. The insulating plate 603 is attached to the side of at least one plate away from the door, thereby increasing the electrical gap between the electrical element assemblies 14, such as copper bars, improving heat dissipation performance and insulating performance.

[0104] In a second aspect, embodiments of the present application further provide an energy storage system, the energy storage system including the current collecting box of any of the above-described embodiments. [Explanation of symbols]

[0105] 10: Box body 11: Door 12: Mounting cavity 121: First mounting cavity 123: Second mounting cavity 1211: First mounting space 1213: Second mounting space 13: First side wall 14: Electrical element assembly 15: Second side wall 17: Third side wall 18: Top wall 19: Bottom wall 1010: Air outlet 1030:Inlet 20: Plate 21: First Plate 23: Second plate 25: Third Plate 31: BMS control parts 33: Signal relay 35: Air Switch 36: Wiring groove 37: Connection terminal 38: AC / DC power supply 40: First operation module 41: Indicator light module 411: Operation indicator light 413: Malfunction indicator light 415: Switch-on indicator light 412: Overheat indicator light 414: Voltage 24V indicator light 416: SOC low indicator light 43: Switch module 431: Remote / local control switch 433: On / off control switch 435: Silence control switch 437: Emergency stop switch 45: Chime 47: Display module 50: Second operation module 60: Alert module 601: First strainer 602: Second strainer 603: Insulating plate 70: Positive electrode 71: Positive fuse 72: Positive high voltage relay 73: Positive electrode interface 74: Circuit breaker 741: First circuit breaker 743: Second circuit breaker 701: First copper bar 75: Cluster high voltage positive electrode connecting copper bar 76: Cluster high voltage positive pole - copper bar of circuit breaker 77: Circuit breaker - output positive copper bar 80: Negative electrode 801: Second copper bar 81: Negative fuse 82: Negative high voltage relay 83: Negative electrode interface 85: Cluster high voltage negative electrode connecting copper bar 86: Cluster high voltage negative pole - copper bar of circuit breaker 87: Circuit breaker - output negative pole copper bar part 90: Wire entrance 91: Precharge resistor 100: Control unit 101: First sub-control unit 103: Second sub-control unit 200:Adjustment instruction section 300: Auxiliary Electrical Unit 301: Auxiliary positive electric fuse 303: Auxiliary negative electric fuse 305: Auxiliary positive electrode interface 307: Auxiliary negative electrode interface 400: Surge protection unit 401: First surge fuse 405: Surge protector 403: Second surge fuse

Claims

1. A box (10) and a door (11), wherein the box (10) has a mounting cavity (12), the door (11) is connected to the box (10) to cover or expose the mounting cavity (12), the box (10) includes a first side wall (13) provided opposite the door (11), and the arrangement direction of the door (11) and the first side wall (13) is a first direction; an electric element assembly (14) mounted in the mounting cavity (12), including a positive electrode portion (70) and a negative electrode portion (80) spaced apart, the positive electrode portion (70) configured to be electrically connected to a positive electrode output terminal of an external distribution box and to be electrically connected to a positive electrode of a battery pack, the negative electrode portion (80) configured to be electrically connected to a negative electrode output terminal of the external distribution box and to be electrically connected to a negative electrode of the battery pack, the positive electrode portion (70) and the negative electrode portion (80) being arranged along the first direction; Including, Current collection box.

2. The positive electrode part (70) includes a positive electrode fuse (71), a positive electrode high-voltage relay (72), and a positive electrode interface (73), and the positive electrode fuse (71), the positive electrode high-voltage relay (72), and the positive electrode interface (73) are electrically connected in sequence, the positive electrode fuse (71) is configured to be electrically connected to a positive electrode output terminal of an external distribution box, and the positive electrode interface (73) is configured to be electrically connected to a positive electrode of a battery pack. The current collection box according to claim 1 .

3. The electrical element assembly (14) further includes a first circuit breaker (741), the first circuit breaker (741) is mounted in the mounting cavity (12), the first circuit breaker (741) is electrically connected to the positive electrode portion (70) and is arranged along the first direction with the positive electrode portion (70), and the first circuit breaker (741) is located closer to the first side wall (13) than the positive electrode portion (70) and the negative electrode portion (80). The current collection box according to claim 2.

4. The negative electrode part (80) includes a negative electrode fuse (81), a negative electrode high voltage relay (82), and a negative electrode interface (83), the negative electrode fuse (81), the negative electrode high voltage relay (82), and the negative electrode interface (83) are electrically connected in sequence, the negative electrode fuse (81) is configured to be electrically connected to a negative electrode output terminal of an external distribution box, and the negative electrode interface (83) is configured to be electrically connected to a negative electrode of a battery pack. The current collection box according to claim 3.

5. The electrical element assembly (14) further includes a second circuit breaker (743), the second circuit breaker (743) is mounted in the mounting cavity (12), the second circuit breaker (743) is electrically connected to the negative electrode portion (80) and is aligned with the negative electrode portion (80) along the first direction.

5. The current collection box according to claim 3 or 4.

6. The current collection box further includes a plurality of plates (20) provided opposite the door (11), and the plurality of plates (20) include a first plate (21), a second plate (23), and a third plate (25) arranged in order along the first direction, the first plate (21) being located closer to the first side wall (13) than the second plate (23) and the third plate (25), the first circuit breaker (741) and the second circuit breaker (743) being attached to the first plate (21) on a side closer to the door (11), the positive electrode portion (70) being attached to the second plate (23) on a side closer to the door (11), and the negative electrode portion (80) being attached to the third plate (25) on a side closer to the door (11). The current collection box according to claim 5.

7. The electric element assembly (14) further includes a first copper bar (701) and a second copper bar (801), and the positive electrode part (70) is electrically connected to a positive output terminal of an external distribution box by the first copper bar (701), and the negative electrode part (80) is electrically connected to a negative output terminal of the external distribution box by the second copper bar (801). The current collection box according to claim 6.

8. The first copper bar (701) is attached to the first plate (21), the second copper bar (801) is attached to the first plate (21), and the second copper bar (801) and the first copper bar (701) are spaced apart. The current collection box according to claim 7.

9. The electric element assembly (14) further includes a control unit (100), the control unit (100) is attached to the mounting cavity (12), the control unit (100) is configured to be electrically connected to the positive electrode unit (70), the negative electrode unit (80) and the battery pack, and the control unit (100) is configured to be electrically connected to a communication signal terminal of the external distribution box to detect the states of the external distribution box and the battery pack. The current collection box according to any one of claims 1 to 4.

10. A current collecting box according to any one of claims 1 to 4, Energy storage systems.

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