Power distribution box, battery pack and electric device

Abstract

The utility model relates to battery pack technical field discloses distribution box, battery pack and electric equipment. Distribution box includes casing, distribution assembly and current -carrying row, and the inside of casing is provided with cavity, and distribution assembly sets up in the cavity, and current -carrying row one end connects distribution assembly, and the other end extends to the outside of casing, wherein, the casing still includes air inlet and air outlet, and the inner wall of casing and distribution assembly form heat dissipation flow channel, and heat dissipation flow channel links air inlet and air outlet, and the surface of current -carrying row is at least partially exposed in heat dissipation flow channel. The utility model makes the airflow can directly and current -carrying row and distribution assembly heat exchange, thereby more efficiently takes away the heat of current -carrying row, improves the heat dissipation efficiency of distribution box.

Description

Technical Field

[0001] This utility model relates to the field of battery pack technology, specifically to a power distribution box, a battery pack, and electrical equipment. Background Technology

[0002] The power distribution box is used for power distribution and isolation protection of the battery pack. When the battery pack inputs or outputs a large current, the power distribution box heats up severely, causing the components inside the power distribution box to withstand high temperatures and reducing the service life of the components.

[0003] Some related technologies employ an air-cooled design, which cools the components by introducing the cooling airflow from the air-cooled battery pack into the distribution box. However, the air-cooling channel design in these technologies suffers from insufficient heat dissipation efficiency, making it difficult to effectively meet the heat dissipation requirements of the distribution box under high current conditions. Utility Model Content

[0004] In view of this, the present invention provides a power distribution box, a battery pack, and electrical equipment to solve the problem of insufficient heat dissipation efficiency of the power distribution box.

[0005] In a first aspect, the present invention provides a power distribution box, including a housing, a power distribution component, and a current-carrying busbar. The housing has a cavity inside, the power distribution component is disposed in the cavity, one end of the current-carrying busbar is connected to the power distribution component, and the other end extends outside the housing. The housing also includes an air inlet and an air outlet. A heat dissipation channel is formed between the inner wall of the housing and the power distribution component. The heat dissipation channel connects the air inlet and the air outlet. The surface of the current-carrying busbar is at least partially exposed in the heat dissipation channel.

[0006] Beneficial effects: Airflow enters the cavity through the air inlet, flows along the heat dissipation channel, and exchanges heat with the internal structure of the cavity before being discharged from the air outlet, thereby achieving air-cooled heat dissipation of the power distribution box. By directly exposing the surface of the current carrier to the heat dissipation channel, the airflow can directly exchange heat with the current carrier. Furthermore, by utilizing the space between the power distribution components and the housing to form a heat dissipation channel, the structure is simplified while also exposing the surface of the power distribution components to the heat dissipation channel, allowing the airflow to directly exchange heat with the power distribution components. This more efficiently removes heat from the current carrier and the power distribution components, improving the heat dissipation efficiency of the power distribution box.

[0007] In one alternative implementation, the heat dissipation channel extends along the current-carrying bus.

[0008] Beneficial effects: The airflow flows along the extension direction of the busbar, thereby prolonging the contact time between the airflow and the surface of the busbar, which helps the heat of the busbar to be more fully transferred to the airflow, further improving the heat dissipation effect of the busbar.

[0009] In one optional embodiment, the power distribution assembly includes a plurality of relays arranged sequentially along the gas flow path of the heat dissipation channel, and the number of current-carrying buses is plurality of, with the plurality of current-carrying buses respectively disposed on the plurality of relays.

[0010] Beneficial effects: During the flow, the airflow exchanges heat with the current-carrying buses and relays along the way, which helps to transfer the heat of the current-carrying buses and relays to the airflow more fully. This makes fuller use of the heat exchange capacity of the airflow and ensures that the airflow leaves the cavity after sufficient heat exchange and heating, further improving the heat dissipation effect on the distribution box.

[0011] In one optional embodiment, having a first direction and a second direction perpendicular to each other, the housing includes a partition extending in the first direction, the partition dividing the cavity into a plurality of spaced-apart slots in the second direction, and a plurality of relays respectively disposed in the plurality of slots; wherein, the partition has a flow hole communicating with adjacent slots, and in the second direction, the air inlet communicates with a slot located at one end, and the air outlet communicates with a slot located at the other end.

[0012] Beneficial effects: By setting baffles to separate interconnected placement slots in the cavity, the airflow passes through each placement slot in sequence, thereby achieving the effect of heat exchange with the relays and current-carrying buses along the way.

[0013] In one optional embodiment, there are two mounting slots, the flow hole is located on one side of the relay in the first direction, the air inlet and the air outlet are located on the other side of the relay in the first direction, and an air gap is left between the relay and the wall of the mounting slot.

[0014] Beneficial effects: The airflow flowing in the first direction will flow over the outer surface of the relay, pass through the air gap and reach the other side of the power distribution component, thereby making the surface of the relay more fully exchange heat with the airflow and improving the heat dissipation effect of the power distribution component.

[0015] In one optional embodiment, a third direction is further provided, wherein the first direction, the second direction, and the third direction are perpendicular to each other, the current-carrying bus is disposed at one end of the relay in the third direction, and a first air gap is formed between the relay and the wall of the mounting slot on the side where the current-carrying bus is located, and a second air gap is formed between the relay and the remaining wall of the mounting slot, wherein the cross-sectional area of ​​the first air gap is greater than or equal to that of the second air gap.

[0016] Beneficial effect: By making the cross-sectional area of ​​the first air gap greater than or equal to that of the second air gap, more airflow can pass through the air gap from the side where the busbar is located, thereby prioritizing the heat dissipation effect of the busbar.

[0017] In one optional embodiment, a third direction is further provided, wherein the first direction, the second direction, and the third direction are perpendicular to each other, the flow passage is located on one side of the flow carrier in the third direction, and the air inlet and the air outlet are located on the other side of the flow carrier in the third direction.

[0018] Beneficial effects: While the airflow flows in the first direction, it can also bypass the busbar in the third direction, thereby allowing the surface of the busbar to exchange heat more fully with the airflow, further improving the heat dissipation effect of the busbar.

[0019] In one alternative embodiment, the housing includes a base and a cover, the cover being detachably disposed on the base, the cover and the base surrounding to form the cavity; the base includes a first fastening portion, the cover includes a second fastening portion, and the cover and the base are fastened together.

[0020] Beneficial effects: The removable housing facilitates the installation and maintenance of power distribution components and busbars.

[0021] Secondly, this utility model also provides a battery pack, including a battery cell and a power distribution box provided by this utility model, wherein the power distribution box is electrically connected to the battery cell.

[0022] Thirdly, this utility model also provides an electrical device, including the battery pack provided by this utility model.

[0023] Beneficial effects: The battery pack and electrical equipment provided by this utility model both include the power distribution box provided by this utility model, and therefore have the corresponding beneficial effects brought by the power distribution box, which will not be elaborated here. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a three-dimensional structural diagram of a power distribution box according to an embodiment of the present utility model;

[0026] Figure 2 for Figure 1An exploded view of the electrical distribution box;

[0027] Figure 3 for Figure 1 A cross-sectional view of the distribution box;

[0028] Figure 4 for Figure 1 A cross-sectional view of the distribution box from another perspective.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Housing; 101. Cavity; 1011. Mounting slot; 10111. First air gap; 10112. Second air gap; 102. Air inlet; 103. Air outlet; 104. Partition; 1041. Flow hole; 1042. First partition; 1043. Second partition; 105. Base; 1051. First fastening part; 106. Cover; 1061. Second fastening part; 2. Power distribution assembly; 201. Relay; 3. Busbar; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a," "an," and "comprising" as used herein may also mean including the plural forms. The terms "comprising," "including," and "having" are inclusive and therefore indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof.

[0033] Although terms such as "first," "second," etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Furthermore, in the description of this utility model, unless otherwise expressly specified and limited, the terms "set up" and "connected" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art will understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "end," "length," "inner," "outer," etc. Such spatial relative terms are intended to include different orientations of the mechanism in use or operation, in addition to those depicted in the figure. For example, if the mechanism in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The mechanism may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0035] The power distribution box is used for power distribution and isolation protection of the battery pack. When the battery pack inputs or outputs a large current, the power distribution box heats up severely, causing the components inside the power distribution box to withstand high temperatures and reducing the service life of the components.

[0036] In related technologies, active heat dissipation of power distribution boxes is divided into two types: air cooling and liquid cooling. Liquid cooling is more expensive and is generally used in liquid-cooled battery packs, and cannot be used in air-cooled battery packs.

[0037] For air-cooled heat dissipation, some related technologies incorporate a heat sink with airflow channels inside the distribution box, placing the power distribution components on the heat sink for heat exchange. However, under high current conditions, the heat primarily originates from the current-carrying busbars 3 (e.g., copper or aluminum busbars) connecting the power distribution components and external inputs / outputs, while the heat generated by the power distribution components (e.g., relay 201) accounts for a relatively small proportion. Heat exchange solely with the power distribution components is insufficient to efficiently and directly remove the heat from the current-carrying busbars 3, failing to effectively meet the heat dissipation requirements of the distribution box under high current. Furthermore, in these related technologies, the airflow indirectly exchanges heat with the power distribution components through the heat sink, and the thermal resistance of the heat sink itself reduces the efficiency of heat transfer to the airflow.

[0038] The following is combined with Figures 1 to 4 The following describes embodiments of the present invention.

[0039] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 According to an embodiment of the present invention, a power distribution box is provided, including a housing 1, a power distribution component 2, and a current-carrying busbar 3. A cavity 101 is provided inside the housing 1, and the power distribution component 2 is disposed inside the cavity 101. One end of the current-carrying busbar 3 is connected to the power distribution component 2, and the other end extends outside the housing 1. The housing 1 also includes an air inlet 102 and an air outlet 103. A heat dissipation channel is formed between the inner wall of the housing 1 and the power distribution component 2. The heat dissipation channel connects the air inlet 102 and the air outlet 103. The surface of the current-carrying busbar 3 is at least partially exposed in the heat dissipation channel.

[0040] Airflow enters cavity 101 from air inlet 102, flows along heat dissipation channel, and exchanges heat with the internal structure of cavity 101 before being discharged from air outlet 103, thereby achieving air cooling of the power distribution box. By directly exposing the surface of the current carrier 3 to the heat dissipation channel, the airflow can directly exchange heat with the current carrier 3. Furthermore, the heat dissipation channel is formed by utilizing the space between the power distribution component 2 and the housing 1, which simplifies the structure and exposes the surface of the power distribution component 2 to the heat dissipation channel, allowing the airflow to directly exchange heat with the power distribution component 2, thereby more efficiently removing the heat from the current carrier 3 and the power distribution component 2.

[0041] Therefore, the power distribution box of this invention can improve heat dissipation efficiency and prevent the power distribution components 2, current-carrying busbars 3, and other structures inside the cavity 101 from being subjected to high temperatures. Furthermore, due to the improved heat dissipation effect of the current-carrying busbars 3, a smaller cross-sectional area current-carrying busbar 3 can be used in the power distribution box for the same power output, thereby also helping to reduce the implementation cost of the power distribution box.

[0042] The power distribution box can be used for current distribution among the cells in a battery pack, or for other scenarios requiring current distribution; this invention does not limit its application in this regard. It is understood that the power distribution component 2 in the power distribution box includes a relay 201 for controlling the on / off state of the circuit. Besides the relay 201, the power distribution component 2 may also include other components for power distribution and regulation, such as fuses, current and voltage signal acquisition elements, etc.; this invention also does not limit its application in this regard.

[0043] Optionally, the heat dissipation channel extends along the current carrier 3. During heat dissipation, the airflow flows along the heat dissipation channel, thereby flowing across the surface of the current carrier 3 along the extension direction of the current carrier 3, prolonging the contact time between the airflow and the surface of the current carrier 3, which helps the heat of the current carrier 3 to be more fully transferred to the airflow, further improving the heat dissipation effect of the current carrier 3.

[0044] It is understood that the heat dissipation channel extends from the air inlet 102 to the air outlet 103. A portion of the heat dissipation channel located around the flow carrier 3 needs to extend along the flow carrier 3 to prolong the time the airflow passes through the flow carrier 3. The extension direction of other parts of the heat dissipation channel can be adjusted and designed according to the heat dissipation needs. This utility model does not limit this.

[0045] Optionally, the power distribution assembly 2 includes multiple relays 201, which are arranged sequentially along the gas flow path of the heat dissipation channel. There are multiple current-carrying buses 3, which are respectively installed on multiple relays 201.

[0046] During the flow, the airflow exchanges heat with the current-carrying busbar 3 and the relay 201 along the way, which helps to more fully transfer the heat of the current-carrying busbar 3 and the relay 201 to the airflow, thereby making fuller use of the heat exchange capacity of the airflow and ensuring that the airflow leaves the cavity 101 after sufficient heat exchange and temperature rise, further improving the heat dissipation effect on the distribution box.

[0047] The distribution box can be constructed in various ways to create heat dissipation channels that sequentially pass through each relay 201. For example, refer to Figure 1 , Figure 2 and Figure 3 The distribution box has a first direction X and a second direction Y that are perpendicular to each other. The housing 1 includes a partition 104 that extends in the first direction X and divides the cavity 101 into a plurality of placement slots 1011 arranged at intervals in the second direction Y. A plurality of relays 201 are respectively disposed in the plurality of placement slots 1011.

[0048] The partition 104 has a flow hole 1041 that connects to the adjacent mounting slots 1011. In the second direction Y, the air inlet 102 is connected to the mounting slot 1011 located at one end, and the air outlet 103 is connected to the mounting slot 1011 located at the other end.

[0049] By setting a partition 104 to separate interconnected placement slots 1011 in the cavity 101, the airflow passes through each placement slot 1011 in sequence, thereby achieving the effect of heat exchange with the relays 201 and the current-carrying busbars 3 along the way, ensuring that the airflow leaves the cavity 101 after sufficient heat exchange and temperature rise.

[0050] On the other hand, the placement slot 101 is arranged in the second direction Y, which can make full use of the space in the second direction Y and avoid the distribution box occupying too much installation space in the first direction X.

[0051] To improve the heat dissipation of the relay 201 within the mounting slot 101, optionally, the airflow inlet and outlet of the mounting slot 1011 are located on opposite sides of the relay 201 in the first direction X, with an air gap between the relay 201 and the wall of the mounting slot 101. The airflow flowing along the first direction X passes over the outer surface of the relay 201, passes through the air gap, and reaches the other side of the relay 201, thereby allowing the surface of the relay 201 to exchange heat more fully with the airflow, improving the heat dissipation of the power distribution component 2.

[0052] It is understood that the number of mounting slots 101 can be two or more. For different mounting slots 101, the airflow inlet and airflow outlet can correspond to different structures. The airflow inlet may be an air inlet 102 or a flow passage 1041, and the airflow outlet may be a flow passage 1041 or an air outlet 103.

[0053] For example, refer to Figure 3 There are two mounting slots 1011. An overflow orifice 1041 is located on one side of the relay 201 in the first direction X. An air inlet 102 and an air outlet 103 are located on the other side of the relay 201 in the same direction X. At this time, along the airflow direction, the air inlet 102 is the airflow inlet of the first mounting slot 1011, the overflow orifice 1041 is the airflow outlet of the first mounting slot 1011 and the airflow inlet of the second mounting slot 1011, and the air outlet 103 is the airflow outlet of the second mounting slot 1011. Airflow enters the mounting slot 1011 from the air inlet 102, travels along the first direction X to the overflow orifice 1041, enters the other mounting slot 1011, travels again along the first direction X to the air outlet 103, and finally leaves the cavity 101.

[0054] Optionally, on the side where the current-carrying busbar 3 is located, a first air gap 10111 is formed between the wall of the relay 201 and the mounting slot 1011, and a second air gap 10112 is formed between the remaining wall of the relay 201 and the mounting slot 1011, wherein the cross-sectional area of ​​the first air gap 10111 is greater than or equal to the second air gap 10112.

[0055] Understandably, as analyzed above, the heat generated by the distribution box comes more from the current-carrying busbar 3. By making the cross-sectional area of ​​the first air gap 10111 greater than or equal to the second air gap 10112, the airflow can be tilted towards the first air gap 10111, flowing more through the current-carrying busbar 3, thereby prioritizing the heat dissipation effect of the current-carrying busbar 3.

[0056] For example, refer to Figure 2 , Figure 3 and Figure 4 The distribution box also has a third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other. The current-carrying bus 3 is set on one end of the relay 201 on the third direction Z. The relay 201 is fixed on the wall of the mounting slot 1011 on the other end of the third direction Z. On the side where the current-carrying bus 3 is located, a first air gap 10111 is formed between the relay 201 and the wall of the mounting slot 101. On the second direction Y, the relay 201 and the wall of the mounting slot 101 are fitted with a clearance. A second air gap 10112 is formed between the two sides of the relay 201 and the wall of the mounting slot 101. The cross-sectional area of ​​the first air gap 10111 is greater than or equal to the second air gap 10112.

[0057] Continue to refer to Figure 2 and Figure 3 Optionally, the flow-through hole 1041 is located on one side of the flow-carrying busbar 3 in the third direction Z, and the air inlet 102 and air outlet 103 are located on the other side of the flow-carrying busbar 3 in the third direction Z. While the airflow flows along the first direction X, it can also bypass the flow-carrying busbar 3 in the third direction Z, thereby allowing the surface of the flow-carrying busbar 3 to exchange heat more fully with the airflow. This avoids the situation where the airflow only flows on one side of the flow-carrying busbar 3 while the airflow on the other side remains stagnant, further improving the heat dissipation effect on the flow-carrying busbar 3.

[0058] Optionally, the housing 1 includes a base 105 and a cover 106. The cover 106 is detachably mounted on the base 105, and the cover 106 and the base 105 together form a cavity 101. The base 105 includes a first fastening portion 1051, and the cover 106 includes a second fastening portion 1061. The cover 106 and the base 105 are fastened together. The housing 1 has a detachable structure, which facilitates the installation and maintenance of the power distribution assembly 2 and the current-carrying busbar 3.

[0059] Specifically, refer to Figure 2The base 105 has an opening in the third direction Z, through which the power distribution component 2 can be inserted into the base 105. The current-carrying bus 3 extends from the opening to the outside of the base 105. The cover 106 is placed on the opening to close it, thereby pressing down on the current-carrying bus 3 while surrounding and forming the cavity 101, thus further positioning the current-carrying bus 3.

[0060] Optionally, the thickness direction of the current-carrying bus 3 is oriented towards the third direction Z, and the current-carrying bus 3 is fixedly installed at the end of the power distribution assembly 2 located in the third direction Z by a nut.

[0061] Optionally, the partition 104 includes a first partition 1042 and a second partition 1043. The first partition 1042 is disposed on the base 105, and the second partition 1043 is disposed on the cover 106. The first partition 1042 and the second partition 1043 extend in the first direction X and are aligned with each other in the second direction Y. When the cover 106 is installed on the base 105, the first partition 1042 and the second partition 1043 contact each other to form a complete partition 104, which divides the cavity 101 into multiple placement slots 101.

[0062] The flow passage 1041 is disposed on the second partition 1043, and the air inlet 102 and the air outlet 103 are disposed on the end of the base 105 away from the opening, so that the airflow can flow along the first direction X and also bypass the flow carrier 3 along the third direction Z.

[0063] Secondly, this utility model also provides a battery pack, including a battery cell and a power distribution box provided by this utility model, wherein the power distribution box is electrically connected to the battery cell.

[0064] The battery pack provided by this utility model includes the power distribution box provided by this utility model, and therefore has the beneficial effects brought by the power distribution box, which will not be described in detail here.

[0065] It is understood that the battery pack can be either air-cooled or liquid-cooled, and this utility model does not limit this. For air-cooled battery packs, the air inlet 102 and air outlet 103 of the distribution box can be connected to the air-cooling circulation inside the battery pack, thereby utilizing the airflow of the air-cooled battery pack to dissipate heat from the distribution box. For liquid-cooled battery packs, it is necessary to supply additional gas to the distribution box for cooling.

[0066] Thirdly, this utility model also provides an electrical device, including the battery pack provided by this utility model.

[0067] The electrical equipment provided by this utility model includes the power distribution box provided by this utility model, and therefore has the beneficial effects brought by the power distribution box, which will not be described in detail here.

[0068] It is understood that the electrical equipment can be a new energy vehicle or other equipment equipped with a battery pack, and this utility model does not limit this.

[0069] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A power distribution box, characterized in that, include: The shell (1) has a cavity (101) inside; A power distribution assembly (2) is disposed within the cavity (101); A current-carrying bus (3) is connected at one end to the power distribution assembly (2) and at the other end extends outside the housing (1); The housing (1) further includes an air inlet (102) and an air outlet (103). A heat dissipation channel is formed between the inner wall of the housing (1) and the power distribution assembly (2). The heat dissipation channel connects the air inlet (102) and the air outlet (103). The surface of the current-carrying bus (3) is at least partially exposed in the heat dissipation channel.

2. The distribution box according to claim 1, characterized in that, The heat dissipation channel extends along the current-carrying bus (3).

3. The distribution box according to claim 2, characterized in that, The power distribution assembly (2) includes multiple relays (201), which are arranged sequentially along the gas flow path of the heat dissipation channel. There are multiple current-carrying buses (3), which are respectively disposed on multiple relays (201).

4. The power distribution box according to claim 3, characterized in that, Having a first direction (X) and a second direction (Y) perpendicular to each other, the housing (1) includes a partition (104) extending in the first direction (X) and dividing the cavity (101) into a plurality of placement slots (1011) spaced apart in the second direction (Y), and a plurality of relays (201) are respectively disposed in the plurality of placement slots (1011); The partition (104) has a flow hole (1041) that connects to the adjacent placement slot (1011). In the second direction (Y), the air inlet (102) is connected to the placement slot (1011) at one end, and the air outlet (103) is connected to the placement slot (1011) at the other end.

5. The distribution box according to claim 4, characterized in that, The number of the mounting slots (1011) is two, the flow hole (1041) is located on one side of the relay (201) in the first direction, the air inlet (102) and the air outlet (103) are located on the other side of the relay (201) in the first direction (X), and an air gap is formed between the walls of the relay (201) and the mounting slots (1011).

6. The distribution box according to claim 5, characterized in that, It also has a third direction (Z), and the first direction (X), the second direction (Y) and the third direction (Z) are perpendicular to each other. The current-carrying bus (3) is disposed on one end of the relay (201) on the third direction (Z). On the side where the current-carrying bus (3) is located, a first air gap (10111) is formed between the wall of the relay (201) and the mounting slot (1011), and a second air gap (10112) is formed between the remaining wall of the relay (201) and the mounting slot (1011). The cross-sectional area of ​​the first air gap (10111) is greater than or equal to that of the second air gap (10112).

7. The distribution box according to claim 5, characterized in that, It also has a third direction (Z), the first direction (X), the second direction (Y) and the third direction (Z) are perpendicular to each other, the flow hole (1041) is located on one side of the flow-carrying bus (3) in the third direction (Z), and the air inlet (102) and the air outlet (103) are located on the other side of the flow-carrying bus (3) in the third direction (Z).

8. The distribution box according to claim 1, characterized in that, The housing (1) includes a base (105) and a cover (106), the cover (106) being detachably disposed on the base (105), and the cover (106) and the base (105) surrounding to form the cavity (101); The seat (105) includes a first fastening part (1051), and the cover (106) includes a second fastening part (1061). The cover (106) and the seat (105) are fastened together.

9. A battery pack, characterized in that, include: Battery cell; The distribution box according to any one of claims 1 to 8 is electrically connected to the battery cell.

10. An electrical appliance, characterized in that, Includes the battery pack as described in claim 9.

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