Battery pack and cabinet

Abstract

The utility model discloses a battery pack which comprises a shell, a module and a heat dissipation assembly, and an accommodating cavity and an opening communicated with the accommodating cavity are formed in the shell. The module is placed in the containing cavity. The heat dissipation assembly comprises a heat conduction plate and a plurality of heat dissipation plates, the heat conduction plate is connected with the shell and seals the opening, one side of the heat conduction plate makes contact with the module, the heat dissipation plates are arranged on the side, away from the module, of the heat conduction plate at intervals, and the heat dissipation plates extend in the direction away from the containing cavity. The battery pack provided by the utility model solves the technical problems of improving the heat dissipation efficiency of the battery cabinet so as to improve the performance and prolong the service life of the battery pack.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery pack and rack. BACKGROUND

[0002] Energy storage technology plays an increasingly important role in grid optimization, especially in places such as base stations, the introduction of energy storage devices effectively improves the utilization rate of the battery and reduces the power supply cost. However, most of the current battery cabinets improve the volume energy density by closely arranging the battery cells, and adopt the locking screw group structure. Although this helps to improve the energy density, it also brings the problem of low heat dissipation efficiency in the cabinet. The temperature in the middle of the cabinet is higher, and the temperature at both ends is lower, resulting in a large temperature difference, which further affects the performance and service life of the battery pack. Therefore, how to improve the heat dissipation efficiency of the battery cabinet to improve the performance and service life of the battery pack has become a key technology to improve the quality of the battery and expand the application scenarios. SUMMARY

[0003] One purpose of the utility model is to provide a battery pack and cabinet, which aims to improve the heat dissipation efficiency of the battery cabinet to improve the performance and service life of the battery pack.

[0004] To achieve the above purpose, the utility model provides a kind of scheme: a kind of battery pack, it is characterized in that, including: shell, module and heat dissipation component, shell is formed with accommodating cavity and with accommodating cavity Communication opening. Module is placed in accommodating cavity. Heat dissipation component includes heat conduction plate and multiple heat dissipation plates, heat conduction plate and shell are connected and seal opening, the side of heat conduction plate and module contact, multiple heat dissipation plates are spaced apart and set on the side of heat conduction plate away from module, and heat dissipation plate extends along the direction away from accommodating cavity.

[0005] Optionally, first air duct is formed between adjacent heat dissipation plates. The heat dissipation component includes a fan, the fan is arranged at least one end of the opposite ends of the first air duct, and the fan and the heat dissipation plate are connected.

[0006] To achieve the above purpose, the present application provides a kind of scheme: including battery pack and cabinet body, battery pack is assembled in cabinet body.

[0007] Optionally, the cabinet further includes a first flow guide assembly and a second flow guide assembly, the number of battery packs is multiple, the first flow guide assembly and the second flow guide assembly are respectively arranged on adjacent battery packs, the first flow guide assembly and the module are electrically connected, the second flow guide assembly and the module are electrically connected, and the first flow guide assembly and the second flow guide assembly cooperate to electrically connect adjacent battery packs.

[0008] Optionally, the first flow guide assembly comprises a first flow guide plate and a female head, the first flow guide plate and the module are electrically connected, and opposite ends of the first flow guide plate are electrically connected with the female head. The second flow guide assembly comprises a second flow guide plate and a male head, the second flow guide plate and the module are electrically connected, and opposite ends of the second flow guide plate are electrically connected with the male head, and the male head and the female head on the adjacent battery pack are plugged and matched.

[0009] Optionally, the female head comprises a first connecting portion and a first conductive portion, the first connecting portion is connected with the shell, a plurality of first conductive portions are arranged on the first connecting portion and jointly enclosed to form a slot, and the first conductive portion is electrically connected with the flow guide plate. The male head comprises a second connecting portion and a second conductive portion, the second connecting portion is connected with the shell, the second conductive portion is arranged on the second connecting portion, and the second conductive portion is electrically connected with the second flow guide plate. Wherein, the second conductive portion is inserted into the slot and electrically connected with the first conductive portion.

[0010] Optionally, the second conductive portion comprises a first portion and a second portion, one end of the first portion is electrically connected with the flow guide plate, the other end is connected with the second portion, and the diameter of the second portion gradually decreases away from the first portion.

[0011] Optionally, the cabinet further comprises a connecting piece, one end of the connecting piece is threadedly connected with the first connecting portion, and the other end is threadedly connected with the second connecting portion.

[0012] Optionally, the cabinet further comprises a fastener, the fastener is arranged through the connecting piece and the first connecting portion and connected with the connecting piece and the first connecting portion respectively; and / or the fastener is arranged through the connecting piece and the second connecting portion and connected with the connecting piece and the second connecting portion respectively.

[0013] Optionally, the cabinet body comprises a first plate, a second plate, a third plate, a fourth plate and a fifth plate, the first plate, the second plate, the third plate, the fourth plate and the fifth plate jointly enclose a placing cavity and an air inlet communicating with the placing cavity, the fifth plate is arranged opposite to the air inlet and closes one end of the placing cavity, and the fifth plate is provided with a plurality of air outlets.

[0014] Optionally, the cabinet comprises a support frame and a tray, the support frame is arranged in the placing cavity and connected with the cabinet body, a plurality of trays are arranged in the placing cavity along the height direction of the cabinet, the tray is connected with the support frame, the tray is provided with a gap hole, a second air duct is formed between adjacent trays, one end of the second air duct communicates with the air inlet, and the other end communicates with the air outlet, the battery pack is connected with the tray, and the heat dissipation plate is arranged through the gap hole and inserted into the second air duct.

[0015] The beneficial effects of the utility model lie in:

[0016] The utility model provides a battery pack for display structure, including shell, module and heat dissipation assembly, the shell forms with containing chamber and the opening that communicates with containing chamber.

[0017] In practical application, the containing chamber is a closed structure, and the heat generated inside the battery pack is effectively transmitted to the plurality of heat dissipation plates through the heat conduction plate. The heat dissipation plates significantly increase the heat dissipation area of the battery pack, thereby improving the heat dissipation efficiency. In addition, the closed design of the containing chamber can effectively prevent external dust and other impurities from entering, reduce the impact on the internal components of the battery pack, reduce the failure rate, and further improve the heat dissipation performance and overall reliability of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative labor.

[0019] Figure 1 It is a structural schematic diagram for showing the battery pack provided by the embodiment of the utility model;

[0020] Figure 2 It is a sectional view for showing the positional relationship between the heat dissipation plate and the shell provided by the embodiment of the utility model;

[0021] Figure 3 It is a whole structural schematic diagram for showing the cabinet provided by the embodiment of the utility model;

[0022] Figure 4 It is a structural schematic diagram for showing the male head and the female head provided by the embodiment of the utility model;

[0023] Figure 5 It is a local structural schematic diagram for showing the first flow guide plate and the second flow guide plate provided by the embodiment of the utility model;

[0024] Figure 6 It is a structural schematic diagram for showing the first flow guide assembly provided by the embodiment of the utility model;

[0025] Figure 7 It is a structural schematic diagram for showing the second flow guide assembly provided by the embodiment of the utility model;

[0026] Figure 8This is a cross-sectional view provided by an embodiment of the present invention to show the connection relationship between the first flow guiding component and the second flow guiding component.

[0027] Explanation of icon numbers:

[0028] 20. Housing; 21. Receiving cavity; 22. Opening; 30. Heat dissipation assembly; 31. Heat conduction plate; 32. Heat dissipation plate; 33. Fan; 34. First air duct; 40. First airflow guiding assembly; 41. First airflow guiding plate; 42. Female connector; 421. First conductive part; 422. Slot; 423. First connecting part; 50. Second airflow guiding assembly; 51. Second airflow guiding plate; 52. Male connector; 521. Second conductive part; 5 211, First part; 5212, Second part; 522, Second connecting part; 60, Connector; 70, Fastener; 80, Module; 90, Cabinet; 92, First plate; 93, Second plate; 94, Third plate; 95, Fourth plate; 96, Fifth plate; 961, Air outlet; 97, Placement cavity; 98, Air inlet; 99, Support frame; 910, Tray; 9101, Clearance hole; 911, Second air duct. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Please see Figures 1 to 3 As shown, Figure 1 This is a schematic diagram illustrating the structure of the battery pack provided in this embodiment of the present invention. Figure 2 This is a cross-sectional view provided by an embodiment of the present invention to show the positional relationship between the heat sink 32 and the housing 20. Figure 3 This is a schematic diagram of the overall structure of the display cabinet provided in this embodiment of the utility model.

[0031] This utility model provides a cabinet, including a battery pack and a cabinet body 90, wherein the battery pack is housed in the cabinet body 90.

[0032] Specifically, the battery pack comprises a shell 20, a module 80 and a heat dissipation assembly 30. The shell 20 is formed with a receiving cavity 21 and an opening 22 communicating with the receiving cavity 21. The module 80 is placed in the receiving cavity 21. The heat dissipation assembly 30 comprises a heat conduction plate 31 and a plurality of heat dissipation plates 32. The heat conduction plate 31 is connected with the shell 20 and seals the opening 22. One side of the heat conduction plate 31 is in contact with the module 80. The plurality of heat dissipation plates 32 are arranged at the side of the heat conduction plate 31 away from the module 80 and extend away from the receiving cavity 21.

[0033] In actual application, the receiving cavity 21 is a closed structure. The heat generated inside the battery pack is effectively transferred to the plurality of heat dissipation plates 32 through the heat conduction plate 31. The heat dissipation plates 32 significantly increase the heat dissipation area of the battery pack, thereby improving the heat dissipation efficiency. In addition, the closed design of the receiving cavity 21 can effectively prevent external dust and other impurities from entering, reduce the influence on the internal components of the battery pack, reduce the failure rate, and further improve the heat dissipation performance and overall reliability of the battery pack.

[0034] In the embodiments of the present application, the materials of the heat conduction plate 31 and the heat dissipation plates 32 can be aluminum alloy, copper alloy, and aluminum-graphite composite plate, etc. The modules 80 in the battery pack are arranged in a straight line, thereby reducing the heat accumulated inside the battery pack, and making the temperature distribution inside the battery pack more uniform. The modules 80 in the battery pack are fixed by at least two layers of steel bands.

[0035] Further, referring to Figure 1 , first air ducts 34 are formed between adjacent heat dissipation plates 32. The heat dissipation assembly 30 comprises a fan 33. The fan 33 is arranged at at least one of the opposite ends of the first air duct 34. The fan 33 is connected with the heat dissipation plates 32.

[0036] In actual application, the airflow of the first air duct 34 passes through the surface of the heat dissipation plates 32, significantly increasing the heat exchange efficiency between the air and the heat dissipation plates 32. The fan 33 can further accelerate the circulation of the airflow, improve the heat transfer capacity of the heat dissipation plates 32, and enhance the heat dissipation effect of the entire heat dissipation assembly 30. In the case of high power output of the battery pack, the fan 33 can provide forced convection heat dissipation, ensuring that the heat dissipation assembly 30 can timely export a large amount of heat, thereby preventing the battery pack from being overheated and causing performance degradation or damage.

[0037] In an embodiment, referring to Figure 3 and Figure 4 , the cabinet further comprises a first flow guide assembly 40 and a second flow guide assembly 50. The number of the battery packs is multiple. The first flow guide assembly 40 and the second flow guide assembly 50 are respectively arranged on adjacent battery packs. The first flow guide assembly 40 and the module 80 are electrically connected. The second flow guide assembly 50 and the module 80 are electrically connected. The first flow guide assembly 40 and the second flow guide assembly 50 cooperate to electrically connect adjacent battery packs.

[0038] In practical applications, the first flow guide assembly 40 and the second flow guide assembly 50 are respectively arranged on adjacent battery packs and electrically connected with the module 80. Through the cooperation of the two, the series or parallel connection between the battery packs can be efficiently realized, and the overall circuit integrity of the battery packs is ensured.

[0039] Further, referring to Figure 5 , the first flow guide assembly 40 includes a first flow guide plate 41 and a female head 42. The first flow guide plate 41 is electrically connected with the module 80, and the opposite ends of the first flow guide plate 41 are electrically connected with the female head 42.

[0040] The second flow guide assembly 50 includes a second flow guide plate 51 and a male head 52. The second flow guide plate 51 is electrically connected with the module 80, and the opposite ends of the second flow guide plate 51 are electrically connected with the male head 52. The male head 52 and the female head 42 on adjacent battery packs are inserted and matched.

[0041] In practical applications, the male head 52 and the female head 42 adopt an insertion and matching structure, making the connection between the battery packs more convenient. When a single battery pack needs to be repaired or replaced, only a simple plug-in operation is required, improving the maintainability and modularization of the system. Through the standardized design of the male head 52 and the female head 42, multiple battery packs can be easily connected in series or parallel, thereby adapting to system configurations with different capacities or voltage requirements, enhancing the flexibility of application scenarios. The first flow guide plate 41 is electrically connected with the female head 42, and the second flow guide plate 51 is electrically connected with the male head 52, making it easy to distinguish the positive and negative electrodes of the battery packs, thereby reducing the occurrence of incorrect electrode connection.

[0042] In this embodiment, the first flow guide plate 41 is electrically connected with the positive electrode of the battery pack, and the second flow guide plate 51 is electrically connected with the negative electrode of the battery pack. When the male head 52 and the female head 42 of adjacent battery packs are inserted and matched, the adjacent battery packs are connected in series.

[0043] Further, referring to Figure 6 and Figure 7 , the female head 42 includes a first connecting portion 423 and a first conductive portion 421. The first connecting portion 423 is connected with the shell 20, and a plurality of first conductive portions 421 are arranged on the first connecting portion 423 and collectively form a slot 422. The first conductive portion 421 is electrically connected with the flow guide plate. The male head 52 includes a second connecting portion 522 and a second conductive portion 521. The second connecting portion 522 is connected with the shell 20, and the second conductive portion 521 is arranged on the second connecting portion 522. The second conductive portion 521 is electrically connected with the second flow guide plate 51. The second conductive portion 521 is inserted into the slot 422 and electrically connected with the first conductive portion 421.

[0044] In actual application, the slot 422 enclosed by the first conductive part 421 provides positioning for the first conductive part 421, ensuring the accuracy of the plugging process and avoiding misalignment or poor contact.

[0045] In the embodiment, the inner diameter of the slot 422 is smaller than the outer diameter of the first conductive part 421, so that when the second conductive part 521 is inserted into the slot 422, the plurality of first conductive parts 421 collectively clamp the second conductive part 521, improving the reliability of the electrical connection between the first conductive part 421 and the second conductive part 521.

[0046] Further, referring to Figure 7 and Figure 8 , the second conductive part 521 includes a first part 5211 and a second part 5212, one end of the first part 5211 is electrically connected to the flow guide plate, the other end is connected to the second part 5212, and the diameter of the second part 5212 gradually decreases away from the first part 5211, that is, the second part 5212 forms a tapered structure.

[0047] In actual application, the gradually decreasing diameter of the second part 5212 allows the gradual alignment of the slot 422 during the plugging process, reducing the mechanical resistance caused by interference during the plugging process, prolonging the service life of the plugging assembly, improving the convenience of user operation, and improving the stability and accuracy of plugging, reducing the risk of misalignment and poor contact during plugging. When the tapered design of the second part 5212 is plugged into place, the plurality of first conductive parts 421 deforms in a direction away from each other, so that the slot 422 forms a tapered structure, and the second part 5212 is also tapered, so that the second part 5212 and the first conductive part 421 can form stable multi-point or ring contact, thereby increasing the contact area, reducing the contact resistance, and further improving the stability and efficiency of current transmission.

[0048] Further, referring to Figure 8 , the cabinet further includes a connecting piece 60, one end of the connecting piece 60 is threadedly connected to the first connecting part 423, and the other end is threadedly connected to the second connecting part 522.

[0049] In actual application, the threaded connection provides high-strength mechanical fixation, making the connection between the first connecting part 423 and the second connecting part 522 more stable and effectively preventing the connection from loosening under vibration or external force impact. Through threaded connection, accidental disconnection of the conductive part under the action of thermal expansion, cold shrinkage or other environmental stress can be effectively prevented, improving the safety and reliability of the cabinet during operation.

[0050] In the embodiment, the connecting piece 60 is a cylindrical shape with two open ends 22, and the connecting piece 60 has internal threads at both ends, and the first connecting part 423 and the second connecting part 522 have external threads.

[0051] Further, referring to Figure 8 , the cabinet further comprises fasteners 70, the fasteners 70 are respectively connected with the connecting piece 60 and the first connecting portion 423 and pass through the connecting piece 60 and the first connecting portion 423; and / or, the fasteners 70 are respectively connected with the connecting piece 60 and the second connecting portion 522 and pass through the connecting piece 60 and the second connecting portion 522.

[0052] In actual application, the fasteners 70 pass through the connecting piece 60 and the first connecting portion 423 or the second connecting portion 522 at the same time, which limits the rotation of the connecting piece 60, thereby reducing the loosening phenomenon caused by long-term use or vibration, and ensuring the durability and stability of the connection.

[0053] In the embodiment, a plurality of fasteners 70 pass through the connecting piece 60 and the first connecting portion 423. In other embodiments of the application, the fasteners 70 can also pass through the connecting piece 60 and the second connecting portion 522. Alternatively, part of the fasteners 70 pass through the connecting piece 60 and the first connecting portion 423, and the other part of the fasteners 70 pass through the connecting piece 60 and the second connecting portion 522.

[0054] In an embodiment, referring to Figure 3 , the cabinet body 90 comprises a first plate 92, a second plate 93, a third plate 94, a fourth plate 95 and a fifth plate 96, the first plate 92, the second plate 93, the third plate 94, the fourth plate 95 and the fifth plate 96 jointly enclose a placing cavity 97 and an air inlet 98 communicating with the placing cavity 97, the fifth plate 96 is arranged opposite to the air inlet 98 and closes one end of the placing cavity 97, and the fifth plate 96 is provided with a plurality of air outlet holes 961.

[0055] In actual application, the heat in the accommodating cavity 21 is transferred to the heat dissipation plate 32 through the heat conduction plate 31, and the air flowing in the placing cavity 97 dissipates heat from the heat conduction plate 31, thereby effectively reducing the temperature in the accommodating cavity 21. The closed design of the accommodating cavity 21 can effectively isolate the entry of external pollutants (such as dust, moisture, etc.), thereby reducing the adverse effects on the battery pack. The design also ensures that the cabinet body 90 has the air inlet 98, the cross-sectional area of which is obviously larger than that of the air outlet hole 961, and the structural difference promotes the air inlet speed to be greater than the air outlet speed, thereby improving the efficiency of air circulation. Higher air inlet speed promotes the convection of air in the placing cavity 97, thereby enhancing the heat dissipation effect.

[0056] Further, referring to Figure 3The cabinet comprises a support frame 99 and a plurality of trays 910, the support frame 99 is arranged in the placing cavity 97 and connected with the cabinet body 90, the plurality of trays 910 are arranged in the placing cavity 97 along the height direction of the cabinet, the trays 910 are connected with the support frame 99, the trays 910 are provided with a plurality of accommodating holes 9101, the second air duct 911 is formed between adjacent trays 910, one end of the second air duct 911 is communicated with the air inlet 98, and the other end of the second air duct 911 is communicated with the air outlet 961, the battery pack is connected with the tray 910, the heat dissipation plate 32 is arranged in the accommodating hole 9101 and inserted into the second air duct 911, and the shell 20 of the battery pack below the heat dissipation plate 32 and adjacent to the heat dissipation plate 32 is inserted into the same second air duct 911 in the height direction of the cabinet body 90.

[0057] In actual application, the air flowing in the second air duct 911 contacts the heat dissipation plate 32 and the battery pack shell 20 at the same time, so that the flowing air performs heat dissipation on the heat dissipation plate 32 and can also take away the heat generated on the surface of the battery pack shell 20. In this way, the air performs heat dissipation on the heat dissipation plate 32 and the shell 20 at the same time in the flowing process, the heat dissipation efficiency of the cabinet as a whole is significantly improved, and the temperature difference in the placing cavity 97 is reduced. It should be noted that all the directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used for explaining the relative position relationship, movement condition and the like between components in a certain specific posture, and if the specific posture changes, the directional indications also change accordingly.

[0058] It should also be noted that when an element is referred to as being "fixed to" or "arranged on" another element, it can be directly on the other element or can also have a middle element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or can also be indirectly connected to the other element through a middle element.

[0059] In addition, the description of "first", "second" and the like in the utility model is only for the purpose of description and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears to be contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the utility model.

[0060] The above merely describes preferred embodiments of the present application, and is not intended to limit the patent scope of the present application, and any equivalent structural transformation or direct / indirect application in other related technical fields under the inventive concept of the present application, as described in the present application specification and drawings, is included in the patent protection scope of the present application.

Claims

1. A battery pack, characterized by, The application relates to a battery pack and a cabinet. The battery pack comprises a shell, a module and a heat dissipation assembly. The shell is formed with a containing cavity and an opening communicating with the containing cavity. The module is arranged in the containing cavity. The heat dissipation assembly comprises a heat conduction plate and a plurality of heat dissipation plates.

2. The battery pack of claim 1, wherein, The heat conduction plate is connected with the shell and seals the opening. One side of the heat conduction plate is in contact with the module.

3. A cabinet, characterized in that The plurality of heat dissipation plates are arranged at intervals on the side of the heat conduction plate away from the module.

4. The cabinet of claim 3, wherein, The heat dissipation plates extend in a direction away from the containing cavity.

5. The cabinet of claim 4, wherein, First air ducts are formed between adjacent heat dissipation plates. The heat dissipation assembly comprises a fan arranged at least one of opposite ends of the first air ducts. The fan is connected with the heat dissipation plates. The battery pack is assembled in the cabinet. The cabinet further comprises a first flow guide assembly and a second flow guide assembly. The number of the battery packs is plural.

7. The cabinet of claim 6, wherein, The first flow guide assembly and the second flow guide assembly are respectively arranged on adjacent battery packs.

8. The cabinet according to any of claims 6 or 7, characterized in that The first flow guide assembly and the module are electrically connected.

9. The cabinet of claim 8, wherein, The second flow guide assembly and the module are electrically connected. The first flow guide assembly and the second flow guide assembly are matched to electrically connect adjacent battery packs. The first flow guide assembly comprises a first flow guide plate and a female head. The first flow guide plate is electrically connected with the module. The opposite ends of the first flow guide plate are electrically connected with the female head. The second flow guide assembly comprises a second flow guide plate and a male head. The second flow guide plate is electrically connected with the module. The opposite ends of the second flow guide plate are electrically connected with the male head. The male head and the female head on adjacent battery packs are inserted and matched. The female head comprises a first connecting part and a first conductive part. The first connecting part is connected with the shell. The first conductive part is arranged at intervals on the first connecting part and collectively enclosed to form a slot. The first conductive part is electrically connected with the flow guide plate. The male head comprises a second connecting part and a second conductive part. The second connecting part is connected with the shell. The second conductive part is arranged on the second connecting part. The second conductive part is electrically connected with the second flow guide plate. The second conductive part is inserted into the slot and electrically connected with the first conductive part. The second conductive part comprises a first part and a second part. One end of the first part is electrically connected with the flow guide plate. The other end of the first part is connected with the second part. The diameter of the second part gradually decreases away from the first part. The cabinet further comprises a connecting piece. One end of the connecting piece is threadedly connected with the first connecting part. The other end of the connecting piece is threadedly connected with the second connecting part. The cabinet further comprises a fastener. The fastener is arranged in and connected with the connecting piece and the first connecting part. The fastener is arranged in and connected with the connecting piece and the second connecting part.

10. The cabinet of claim 3, wherein, The cabinet body comprises a first plate, a second plate, a third plate, a fourth plate and a fifth plate, which jointly enclose a placing cavity and an air inlet communicating with the placing cavity, the fifth plate is arranged opposite to the air inlet and closes one end of the placing cavity, and the fifth plate is provided with a plurality of air outlets.

11. The cabinet of claim 10, wherein, The cabinet comprises a support frame and a tray, the support frame is arranged in the placing cavity and connected with the cabinet body, a plurality of the trays are arranged in the placing cavity along the height direction of the cabinet, the tray is connected with the support frame, the tray is provided with a gap hole, a second air duct is formed between adjacent trays, one end of the second air duct communicates with the air inlet, and the other end communicates with the air outlet, the battery pack is connected with the tray, and the heat dissipation plate is arranged in the gap hole and inserted into the second air duct.

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