Self-unloading structure and electric device

Abstract

A self-unloading structure (100) and an electric device (200). The self-unloading structure (100) is configured to load and unload a battery pack (210) in the electric device (200), wherein a first connecting portion (212) is provided on the battery pack (210), and a second connecting portion (221) is provided on a carrying member (220) of the electric device (200); the first connecting portion (212) and the second connecting portion (221) are stacked; the self-unloading structure (100) is provided with a driving member (10) and a connecting rod (20), the driving member (10) being disposed on the side of the second connecting portion (221) facing away from the first connecting portion (212), a first connecting end (21) of the connecting rod (20) being connected to the driving member (10), and the driving member (10) being capable of driving the connecting rod (20) to extend or retract; when the connecting rod (20) extends, a second connecting end (22) of the connecting rod (20) penetrates the second connecting portion (221) and is connected to the first connecting portion (212), so as to fixedly mount the battery pack (210) on the carrying member (220); and when the connecting rod (20) retracts to disconnect the second connecting end (22) from the first connecting portion (212), the first connecting portion (212) is separated from the second connecting portion (221), and the battery pack (210) is separated from the carrying member (220) and falls off. In this way, when thermal runaway occurs in the battery pack (210), the battery pack can be promptly separated from the carrying member (220) and fall off, thereby ensuring the operational safety and service life of the electric device (200).

Description

Self-unloading structure and electric device

[0001] Cross-reference to Related Applications

[0002] The present application claims priority to the Chinese patent application No. 202421290413.3, filed on June 6, 2024, and entitled “Self-unloading structure and electric device”, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of batteries, and in particular to a self-unloading structure and an electric device. BACKGROUND

[0004] A battery pack is usually fixedly installed in an electric device. When the battery pack is damaged due to scratching, overcharging and overdischarging of the battery pack, or impact on the electric device, and a thermal runaway of a battery cell inside the battery pack is triggered, the battery pack cannot be unloaded from the electric device in a short time, resulting in continuous eruption of high-temperature and high-pressure thermal runaway gas generated by the thermal runaway, and finally leading to damage of the electric device. SUMMARY

[0005] The present application aims to provide a self-unloading structure and an electric device to solve the problem that the electric device is damaged when the battery pack cannot be unloaded from the electric device in time when a thermal runaway occurs.

[0006] A first aspect of the embodiments of the present application provides a self-unloading structure, which is used for loading and unloading of a battery pack in an electric device; the electric device comprises the battery pack and a carrier; the carrier is internally provided with a first accommodating cavity, and the carrier comprises a second connecting portion arranged in the first accommodating cavity; the battery pack is arranged in the first accommodating cavity, and the battery pack comprises a box body, the box body is provided with a first connecting portion protruding therefrom, the first connecting portion has a thickness direction, and the second connecting portion and the first connecting portion are stacked along the thickness direction; the self-unloading structure is arranged in the first accommodating cavity and comprises a driving member arranged on a side of the second connecting portion away from the first connecting portion in the thickness direction; a connecting rod comprising a first connecting end and a second connecting end oppositely arranged along the thickness direction, the first connecting end is connected with the driving member, and the driving member can drive the connecting rod to extend or contract along the thickness direction; along the thickness direction, the connecting rod extends to the second connecting end penetrating through the second connecting portion and connected with the first connecting portion, so as to fix and install the battery pack in the first accommodating cavity; the connecting rod is contracted to release the connection between the connecting rod and the first connecting portion, the first connecting portion is separated from the second connecting portion, and the battery pack is separated from the carrier and falls off.

[0007] Optionally, the first connecting portion is internally provided with a first accommodating cavity, the first connecting portion comprises a first wall, and the first wall is arranged towards the second connecting portion in the thickness direction; the self-unloading structure further comprises a sliding member, and the sliding member is arranged in the first accommodating cavity; in the thickness direction, the connecting rod is extended, the second connecting end pushes the sliding member to abut against the first wall, the connecting rod is connected with the first connecting portion through the sliding member; and the connecting rod is retracted to separate the sliding member from the first wall, thereby disconnecting the connecting rod from the first connecting portion.

[0008] Optionally, the self-unloading structure further comprises an accommodating member; the accommodating member is internally provided with a second accommodating cavity, the accommodating member penetrates through the second connecting portion in the thickness direction and is inserted into the first accommodating cavity, a second through hole is arranged on the accommodating member in the first accommodating cavity, so as to communicate the first accommodating cavity and the second accommodating cavity; the sliding member is arranged in the second accommodating cavity; and the connecting rod is inserted into the second accommodating cavity, the connecting rod is extended, the second connecting end pushes the sliding member, and part of the sliding member can be extended out of the second through hole and abut against the first wall; the connecting rod is retracted to separate the second connecting end from the sliding member, and the sliding member can be retracted into the second accommodating cavity through the second through hole and separated from the first wall.

[0009] Optionally, the self-unloading structure further comprises a buffer member, the buffer member is arranged between the first connecting portion and the second connecting portion, and the connecting rod penetrates through the buffer member in the thickness direction.

[0010] Optionally, a first through hole is arranged on the first wall and communicates with the first accommodating cavity, the first wall has an inner circumferential wall surrounding the first through hole in the circumferential direction of the first through hole; the second connecting end pushes the sliding member, and the sliding member moves to abut against the inner circumferential wall; the second connecting end is separated from the sliding member, and the sliding member moves to separate from the inner circumferential wall; and the surface of the sliding member in contact with the inner circumferential wall is an arc surface.

[0011] Optionally, the surface of the sliding member in contact with the second connecting end is an arc surface, and / or the surface of the second connecting end in contact with the sliding member is an arc surface.

[0012] Optionally, in the thickness direction, a stop portion is protrudingly arranged on the surface of the sliding member towards the first wall; the sliding member moves to abut against the inner circumferential wall, and the stop portion abuts against the accommodating member.

[0013] Optionally, an accommodating groove is arranged on the inner side wall of the first connecting portion, and opposite ends of the accommodating groove in the thickness direction penetrate through the first connecting portion to form a through groove structure.

[0014] Optionally, the second connecting end is provided with a protruding part, which protrudes on the side wall of the connecting rod in a direction orthogonal to the thickness direction, and the number of the protruding part corresponds to the number of the accommodating grooves.

[0015] Optionally, a jack is formed on the first connecting part and penetrates the first connecting part in the thickness direction, and the connecting rod is connected to the first connecting part through the jack.

[0016] Optionally, the number of the sliding parts is at least two, and the at least two sliding parts are arranged at intervals along the circumferential direction of the connecting rod.

[0017] Optionally, the driving part can drive the connecting rod to rotate and extend or contract in the thickness direction, and at least the first connecting part is threadedly connected to the connecting rod.

[0018] Optionally, the driving part is arranged on the bearing part, or the driving part is arranged on the box.

[0019] The second aspect of the embodiment of the present application provides a power utilization device, which comprises: a battery pack, the battery pack comprising a box and a battery management assembly, a first connecting part protruding on the box, the first connecting part having a thickness direction, and the battery management assembly arranged inside the box; a bearing part, the bearing part being provided with a second connecting part, the second connecting part being stacked with the first connecting part in the thickness direction; a controller, the battery management assembly being in communication connection with the controller; and a self-unloading structure as described above, the driving part in the self-unloading structure being in communication connection with the controller, and the controller driving the connecting rod to extend or contract in the thickness direction by controlling the driving part.

[0020] In summary, the self-unloading structure and the electric device with the same are provided in the embodiments of the present application. The self-unloading structure is used for loading and unloading of the battery pack in the electric device. The first connecting part is protruded on the box of the battery pack. The bearing part of the electric device is internally provided with the first accommodating cavity and includes the second connecting part arranged inside the first accommodating cavity. The first connecting part and the second connecting part are stacked along the thickness direction. The self-unloading structure is provided with the driving part and the connecting rod. The driving part is arranged on the side of the second connecting part away from the first connecting part. The first connecting end of the connecting rod is connected with the driving part. The driving part can drive the connecting rod to extend or contract along the thickness direction. When the driving part drives the connecting rod to extend, the second connecting end of the connecting rod penetrates the second connecting part along the thickness direction and is connected with the first connecting part, so as to fix and mount the battery pack on the bearing part. When the connecting rod is contracted, the connection between the second connecting end and the first connecting part is released. The first connecting part is separated from the second connecting part, so that the battery pack is separated from the bearing part. The battery pack automatically falls by its own weight. Therefore, when the battery pack is in thermal runaway, the battery pack can be separated from the bearing part and fall in time by the control of the driving part, so as to avoid the case that the gas and flame generated by the thermal runaway continuously damage the electric device and cause the damage of the electric device, ensure the use safety and service life of the electric device, and avoid the abnormality of the battery pack from affecting the whole electric device. The safety of the user is improved, the probability of the damage of the whole electric device is reduced, and the economic loss is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] FIG. 1 is a first structure schematic diagram of the self-unloading structure, the battery pack and the bearing part assembled according to the embodiments of the present application;

[0023] FIG. 2 is an enlarged structure schematic diagram of A in FIG. 1;

[0024] FIG. 3 is an enlarged structure schematic diagram of B in FIG. 2;

[0025] FIG. 4 is a structure schematic diagram of the connection between the connecting rod and the first connecting part in the self-unloading structure shown in FIG. 1;

[0026] FIG. 5 is an enlarged structure schematic diagram of C in FIG. 4;

[0027] FIG. 6 is a second structure schematic diagram of the self-unloading structure, the battery pack and the bearing part assembled according to the embodiments of the present application;

[0028] FIG. 7 is an enlarged structure schematic diagram of D in FIG. 6;

[0029] Fig. 8 is a third structural schematic diagram of the self-unloading structure, the battery pack and the carrier assembly according to an embodiment of the present application;

[0030] Fig. 9 is an enlarged structural schematic diagram at E of Fig. 8;

[0031] Fig. 10 is a structural schematic diagram of the connecting rod in the self-unloading structure shown in Fig. 8;

[0032] Fig. 11 is a structural schematic diagram of the connecting rod and the first connecting part in a separated state;

[0033] Fig. 12 is a structural schematic diagram of the connecting rod and the first connecting part in a connected state;

[0034] Fig. 13 is a structural schematic diagram of the electric device according to an embodiment of the present application;

[0035] Fig. 14 is an exploded view of Fig. 13;

[0036] Fig. 15 is a structural schematic diagram of the battery pack in the electric device according to an embodiment of the present application;

[0037] Fig. 16 is an exploded view of Fig. 15;

[0038] Fig. 17 is a structural schematic diagram of the combination of the self-unloading structure, the controller, the battery pack and the carrier in the electric device according to an embodiment of the present application.

[0039] Main figure mark explanation: 100, self-unloading structure; 10, driving member, 20, connecting rod, 21, first connecting end, 22, second connecting end, 23, protruding part, 30, sliding member, 31, stop part, 40, containing member, 401, second containing cavity, 41, end wall, 42, side wall, 43, second through hole, 50, buffering member; 200, electric device, 201, main body; 210, battery pack, 211, box body, 2110, second containing cavity, 2111, side face, 2112, top face, 2113, bottom face, 212, first connecting part, 2120, first containing cavity, 2121, first wall, 2122, second wall, 2123, first through hole, 2124, inner circumferential wall, 2125, third through hole, 2126, containing groove, 2127, insertion hole, 213, battery management assembly, 214, battery monomer, 215, collection wire harness; 220, carrier, 2201, first containing cavity, 221, second connecting part; 230, controller, 231, communication wire harness, 232, control wire harness; X, thickness direction. DETAILED DESCRIPTION

[0040] In order to make the purposes, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below with reference to the drawings and specific embodiments. It should be understood that the specific embodiments described in the specification are only for the purpose of interpreting the present application and are not intended to limit the present application.

[0041] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0042] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, it can be direct connection, or indirect connection through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "over", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "under", "below" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0044] In the embodiments of the application, "parallel" refers to a state in which a straight line and a straight line, a straight line and a surface, or a surface and a surface form an angle of -1° to 1°. In addition, "perpendicular" refers to a state in which a straight line and a straight line, a straight line and a surface, or a surface and a surface form an angle of 89° to 91°. Equal distance or equal angle refers to a state in which the tolerance range is -1% to 1%.

[0045] In some embodiments of the application, a self-unloading structure 100 is provided for loading and unloading a battery pack 210 in an electrical equipment 200, referring to FIGS. 1, 6, 8, and 14-16, the electrical equipment 200 includes the battery pack 210 and a carrier 220. Referring to FIGS. 1-2, 4, 6-9, and 14 and 17, the carrier 220 is internally provided with a first accommodating cavity 2201, and referring to FIGS. 1-9, the carrier 220 is provided with a second connecting portion 221. Referring to FIGS. 1-2, 4, and 6-8, the battery pack 210 is arranged in the first accommodating cavity 2201 of the carrier 220, and referring to FIGS. 1-2, 4, 6-8, and 14-16, the battery pack 210 includes a box body 211, the box body 211 is provided with a first connecting portion 212 protruding therefrom, the first connecting portion 212 has a thickness direction X, and the second connecting portion 221 and the first connecting portion 212 are stacked along the thickness direction X.

[0046] Referring to FIGS. 1-12, the self-unloading structure 100 includes a driving member 10 and a connecting rod 20.

[0047] Referring to FIGS. 1-9, the driving member 10 is arranged on a side of the second connecting portion 221 away from the first connecting portion 212 in the thickness direction X, and referring to FIGS. 2-4, 7, and 9-10, the connecting rod 20 includes a first connecting end 21 and a second connecting end 22 oppositely arranged along the thickness direction X, the first connecting end 21 is connected with the driving member 10, and the driving member 10 can drive the connecting rod 20 to extend or contract along the thickness direction X. The connecting rod 20 extends along the thickness direction X to the second connecting end 22 penetrating through the second connecting portion 221 and being connected with the first connecting portion 212, so as to fixedly mount the battery pack 210 on the carrier 220, and the connecting rod 20 contracts along the thickness direction X to the second connecting end 22 to release the connection between the second connecting end 22 and the first connecting portion 212, so that the first connecting portion 212 and the second connecting portion 221 are separated, the battery pack 210 and the carrier 220 are separated and fall off, and specifically, the battery pack 210 falls off and drops out of the first accommodating cavity 2201 to be separated from the carrier 220 by relying on the weight of the battery pack 210.

[0048] As a component for providing electric energy to an electric device, a battery pack is usually fixedly installed in the electric device, and in order to facilitate the maintenance of the battery pack, the bottom surface of the battery pack case is usually exposed, when the exposed bottom surface is scratched, the battery pack is overcharged or over-discharged, the electric device is impacted, etc., causing the battery cells inside the battery pack to be damaged, and causing the battery cells to heat runaway, the fixedly installed battery pack cannot be removed from the electric device in a short time, causing the high-temperature and high-pressure heat runaway gas generated by the battery cells that heat runaway to continue to erupt, and further causing the battery pack to catch fire, eventually leading to the destruction of the electric device.

[0049] The self-unloading structure 100 provided by the embodiment of the application is arranged in the first accommodating cavity 2201 of the bearing 220 of the electrical equipment 200, the second connecting part 221 is arranged in the first accommodating cavity 2201, the battery pack 210 is arranged in the first accommodating cavity 2201, the first connecting part 212 is arranged in protrusion on the box 211 of the battery pack 210, the first connecting part 212 and the second connecting part 221 are overlapped along the thickness direction X of the first connecting part 212, the self-unloading structure 100 is arranged in the first accommodating cavity 2201, the driving part 10 and the connecting rod 20 are arranged, the driving part 10 is arranged on the side of the second connecting part 221 away from the first connecting part 212 in the thickness direction X, the first connecting end 21 of the connecting rod 20 is connected with the driving part 10, the driving part 10 can drive the connecting rod 20 to stretch out or contract in the thickness direction X, the driving part 10 drives the connecting rod 20 to stretch out, the second connecting end 22 of the connecting rod 20 penetrates through the second connecting part 221 on the bearing 220 in the thickness direction X and is connected with the first connecting part 212 on the box 211, so as to fix and install the battery pack 210 in the first accommodating cavity 2201 of the bearing 220, the driving part 10 drives the connecting rod 20 to contract, the connecting rod 20 contracts to release the connection between the second connecting end 22 and the first connecting part 212, the first connecting part 212 and the second connecting part 221 are separated, the battery pack 210 is separated from the bearing 220 and falls from the first accommodating cavity 2201 by the self weight, so that when the battery monomer 214 in the battery pack 210 occurs thermal runaway, the battery pack 210 can be separated from the bearing 220 in time and automatically falls by the self weight through the control of the driving part 10 on the connecting rod 20, the thermal runaway gas generated by the thermal runaway of the battery monomer 214 and the flame caused by the injection of the thermal runaway gas are avoided to continuously damage the electrical equipment 200, and the use safety and service life of the electrical equipment 200 are ensured. Moreover, the driving part 10 drives the connecting rod 20 to stretch out or contract to realize the fixing or separation between the battery pack 210 and the bearing 220, the contraction action can make the connecting rod 20 timely and rapidly separate, the battery pack 210 and the bearing 220 are timely and rapidly separated, the situation of jamming in the process of unloading the battery pack 210 is avoided, the abnormality of the battery pack 210 does not affect the whole electrical equipment 200, the safety of the user is improved, the probability of the whole electrical equipment 200 being damaged is reduced, and the economic loss is reduced.

[0050] The electrical equipment 200 can be, but is not limited to, a mobile device (such as a mobile phone, a notebook computer, etc.), an electric vehicle (such as a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric bicycle, an electric scooter, an electric golf cart, an electric truck, etc.), an electric train, a ship and a satellite, an energy storage system, etc. The driving part 10 can be a telescopic motor, a hydraulic telescopic motor, a pneumatic telescopic motor, etc.

[0051] In some embodiments, referring to FIGS. 1, 6, 8, and 13-17, the electrical equipment 200 is an electric vehicle, and the electrical equipment 200 includes a main body 201, a battery pack 210, and a carrier 220.

[0052] The main body 201 is the main structure of the electric vehicle, which is equivalent to the vehicle body of the electric vehicle. The carrier 220 is equivalent to the frame of the electric vehicle. Referring to FIGS. 1, 6, 8, 14, and 17, the carrier 220 has a hexahedral structure, and a first accommodating cavity 2201 is arranged inside the carrier 220. Along the height direction of the electric vehicle, an opening is formed on each of the opposite end faces of the carrier 220 and communicates with the first accommodating cavity 2201, so that the carrier 220 has a hexahedral structure with both ends open.

[0053] Referring to FIGS. 1, 6, 8, and 17, the battery pack 210 is arranged in the first accommodating cavity 2201 of the carrier 220. Referring to FIGS. 1, 6, 8, and 14-16, the box body 211 of the battery pack 210 includes a side face 2111, a top face 2112, and a bottom face 2113. The side face 2111 has a tetrahedral structure with both ends open. The top face 2112 and the bottom face 2113 cover the two openings, respectively, so that the box body 211 has a closed hexahedral structure. Referring to FIGS. 1, 6, 8, and 16, a second accommodating cavity 2110 is arranged inside the box body 211, and the battery cells 214 are arranged in the second accommodating cavity 2110.

[0054] In some embodiments, referring to FIGS. 1-2, 4, 6-9, and 14-16, the first connecting portions 212 are protrudingly arranged on the side face 2111 of the box body 211, and the thickness direction X of the first connecting portions 212 is parallel to the height direction of the box body 211. In the embodiment shown in FIGS. 14-16, for example, the number of the first connecting portions 212 is plural, and the first connecting portions 212 are arranged on the side face 2111 at intervals along the length direction of the box body 211. Specifically, a plurality of first connecting portions 212 are arranged on each of the two side faces 2111 arranged opposite to each other along the width direction of the box body 211. Referring to FIG. 17, the number of the first connecting portions 212 corresponds to the number of the dump structures 100.

[0055] Referring to FIGS. 1, 6, and 8, the bottom face 2113 of the box body 211 is located outside the end of the carrier 220 away from the top face 2112, that is, the bottom face 2113 of the box body 211 is exposed outside the carrier 220. During driving of the electric vehicle, the exposed bottom face 2113 is likely to be scratched by obstacles (such as road bumps, stones, etc.) on the road surface, which may cause damage to the box body 211 and further increase the probability of thermal runaway of the battery cells 214 inside the box body 211.

[0056] Referring to FIGS. 1-9, the first connecting portion 212 is disposed on the side of the second connecting portion 221 away from the top surface 2112 in the thickness direction X, so that the second connecting portion 221 does not form support for the first connecting portion 212, and further so that when the connecting rod 20 is retracted to release the connection between the second connecting end 22 and the first connecting portion 212, the first connecting portion 212 and the second connecting portion 221 are separated by the weight of the battery pack 210 itself, the battery pack 210 can directly fall from the first accommodating cavity 2201, so that the battery pack 210 is separated from the electrical equipment 200 (i.e., an electric vehicle), ensuring the safety of the use of the electrical equipment 200.

[0057] In some embodiments, the first connecting portion 212 is protrudingly disposed on the top surface 2112 of the box 211, the thickness direction X of the first connecting portion 212 is parallel to the length direction of the box 211, along the height direction of the box 211, the end surface of the carrier 220 facing the top surface 2112 is closed, the end surface of the carrier 220 facing the bottom surface 2113 is provided with an opening, so that the carrier 220 forms a six-surface structure with one open surface, the bottom surface 2113 of the box 211 is exposed to the opening, the second connecting portion 221 is protrudingly disposed on the inner surface of the end surface of the carrier 220 facing the top surface 2112, the second connecting portion 221 is stacked with the first connecting portion 212 in the thickness direction X, the connecting rod 20 penetrates the second connecting portion 221 in the thickness direction X and is connected with the first connecting portion 212, so that the battery pack 210 is hung on the second connecting end 22 of the connecting rod 20 through the first connecting portion 212, the driving member 10 drives the connecting rod 20 to retract to release the connection between the second connecting end 22 and the first connecting portion 212, and the battery pack 210 automatically falls by its own weight to separate from the carrier 220.

[0058] In some embodiments, referring to FIGS. 2-5, the first connecting portion 212 is internally provided with a first accommodating cavity 2120, referring to FIGS. 2-3 and 5, the first connecting portion 212 includes a first wall 2121 and a second wall 2122 oppositely arranged along the thickness direction X, the first wall 2121 is arranged towards the second connecting portion 221 along the thickness direction X, referring to FIGS. 2-5, the self-discharging structure 100 further includes a sliding piece 30, the sliding piece 30 is arranged in the first accommodating cavity 2120, the driving piece 10 drives the connecting rod 20 to extend along the thickness direction X, the second connecting end 22 pushes the sliding piece 30 to abut against the first wall 2121, so that the connecting rod 20 is connected with the first connecting portion 212 through the sliding piece 30, in other words, the second connecting end 22 of the connecting rod 20 cooperates with the first wall 2121 of the first connecting portion 212 to clamp the sliding piece 30, the pushing force of the second connecting end 22 on the sliding piece 30 and the reaction force of the first wall 2121 on the sliding piece 30 due to the pushing force are balanced, so that the first connecting portion 212 is fixedly connected with the second connecting portion 221 through the sliding piece 30 and the connecting rod 20, and the battery pack 210 is fixedly installed in the first accommodating cavity 2201 of the carrier 220. The driving piece 10 drives the connecting rod 20 to retract along the thickness direction X until the sliding piece 30 is separated from the first wall 2121, and the connection between the connecting rod 20 and the first connecting portion 212 is released, specifically, the connecting rod 20 retracts along the thickness direction X until the second connecting end 22 is separated from the sliding piece 30, the sliding piece 30 loses the pushing force of the second connecting end 22, and slides away from the first wall 2121 under the action of the reaction force of the first wall 2121 until the sliding piece 30 is separated from the first wall 2121, so that the connection between the connecting rod 20 and the first connecting portion 212 is released, the connection between the first connecting portion 212 and the second connecting portion 221 is released, and the battery pack 210 falls from the first accommodating cavity 2201 under the action of its own weight, so that the battery pack 210 is separated from the carrier 220, and the battery pack 210 is separated from the electrical equipment 200. The cooperation between the sliding piece 30 and the connecting rod 20 can stably connect the connecting rod 20 and the first connecting portion 212 through the pushing force and the reaction force of the second connecting end 22 and the first wall 2121 on the sliding piece 30, so as to ensure the assembly stability between the battery pack 210 and the carrier 220, and when the connecting rod 20 retracts and separates, the sliding piece 30 losing the pushing force can be smoothly separated from the first wall 2121 under the action of the reaction force of the first wall 2121, so as to ensure that the first connecting portion 212 and the second connecting portion 221 are timely and smoothly separated, the battery pack 210 is timely separated from the carrier 220, and the use safety and service life of the electrical equipment 200 are ensured.

[0059] In some embodiments, referring to FIGS. 2-5, the self-unloading structure 100 further comprises a containing member 40, the containing member 40 is internally provided with a second containing cavity 401, the containing member 40 penetrates the second connecting portion 221 along the thickness direction X and is inserted into the first containing cavity 2120, the containing member 40 located in the first containing cavity 2120 is provided with a second through hole 43 to communicate the second containing cavity 401 and the first containing cavity 2120, the sliding member 30 is arranged in the second containing cavity 401, and specifically, in the embodiments shown in FIGS. 2-3 and 5, the containing member 40 comprises an end wall 41 and a side wall 42, the side wall 42 surrounds the end wall 41 along the circumferential direction of the end wall 41 and defines the second containing cavity 401, the side wall 42 is connected with the driving member 10 at one end away from the end wall 41 along the thickness direction X, the side wall 42 penetrates the second connecting portion 221 along the thickness direction X and extends into the first containing cavity 2120 of the first connecting portion 212, the end wall 41 is located in the first containing cavity 2120, the second through hole 43 is arranged on the side wall 42 located in the first containing cavity 2120 to communicate the first containing cavity 2120 and the second containing cavity 401, and the sliding member 30 is arranged on the end wall 41.

[0060] Referring to FIGS. 2-5, the connecting rod 20 is inserted into the second containing cavity 401, and referring to FIGS. 2-3, the connecting rod 20 extends out along the thickness direction X, the second connecting end 22 of the connecting rod 20 pushes the sliding member 30, and part of the sliding member 30 can extend out of the second through hole 43 and abut against the first wall 2121 of the first connecting portion 212, so that the connecting rod 20 is connected with the first connecting portion 212 through the sliding member 30. Referring to FIGS. 4-5, the connecting rod 20 is retracted along the thickness direction X to separate the second connecting end 22 from the sliding member 30, the sliding member 30 can be retracted into the second containing cavity 401 from the second through hole 43 and separated from the first wall 2121, thereby releasing the connection between the connecting rod 20 and the first connecting portion 212, specifically, the second connecting end 22 is separated from the sliding member 30, the sliding member 30 loses the pushing force exerted by the second connecting end 22 on the sliding member 30, so that the sliding member 30 is retracted into the second containing cavity 401 from the second through hole 43 under the action of the reaction force of the first wall 2121 and separated from the first wall 2121, the connection between the first connecting portion 212 and the second connecting portion 221 is released, the battery pack 210 falls from the first containing cavity 2201 under the action of its own weight, so that the battery pack 210 is separated from the carrier 220, and the battery pack 210 is separated from the electrical equipment 200. The arrangement of the containing member 40 can limit and contain the sliding member 30, so that the sliding member 30 can extend out of the second through hole 43 or be retracted into the second containing cavity 401 along with the extension or retraction of the connecting rod 20, thereby avoiding the electrical equipment 200 from shaking or being impacted, ensuring the stability of the abutment between the sliding member 30, the second connecting end 22 and the first wall 2121, and further ensuring the assembly stability of the battery pack 210 in the carrier 220, and avoiding the battery pack 210 from falling from the electrical equipment 200 in a normal state.

[0061] In some embodiments, referring to FIG. 3 and FIG. 5, the first wall 2121 of the first connecting part 212 is provided with a first through hole 2123 communicating with the first accommodating cavity 2120, and the first wall 2121 has an inner circumferential wall 2124 surrounding the first through hole 2123 along the circumferential direction of the first through hole 2123. Referring to FIG. 3, the connecting rod 20 extends along the thickness direction X, the second connecting end 22 of the connecting rod 20 pushes the sliding piece 30, the sliding piece 30 extends out of the second through hole 43 and abuts against the inner circumferential wall 2124, specifically, the sliding piece 30 abuts against one end of the inner circumferential wall 2124 away from the second connecting part 221 in the thickness direction X, and the second connecting end 22 of the connecting rod 20 cooperates with the inner circumferential wall 2124 to clamp the sliding piece 30, the pushing force of the second connecting end 22 on the sliding piece 30 and the reaction force of the inner circumferential wall 2124 on the sliding piece 30 due to the pushing force are balanced, so that the first connecting part 212 is fixedly connected with the second connecting part 221 through the sliding piece 30 and the connecting rod 20, and the battery pack 210 is stably installed in the first accommodating cavity 2201 of the carrier 220. Referring to FIG. 4 and FIG. 5, the connecting rod 20 is retracted along the thickness direction X, and the second connecting end 22 is separated from the sliding piece 30, the sliding piece 30 loses the pushing force of the second connecting end 22, and the sliding piece 30 is retracted into the second accommodating cavity 401 from the second through hole 43 under the action of the reaction force of the inner circumferential wall 2124 and is separated from the inner circumferential wall 2124, the connection between the first connecting part 212 and the second connecting part 221 is released, the battery pack 210 falls from the first accommodating cavity 2201 under the action of its own weight, the battery pack 210 is separated from the carrier 220, and the battery pack 210 is separated from the electrical equipment 200. The sliding piece 30 abuts against the inner circumferential wall 2124 surrounding the first through hole 2123, which can ensure the reaction force of the inner circumferential wall 2124 on the sliding piece 30, avoid the sliding of the sliding piece 30 relative to the inner circumferential wall 2124, further ensure the connection stability between the second connecting part 221 and the first connecting part 212, and ensure the assembly stability between the battery pack 210 and the carrier 220, and when the connecting rod 20 is retracted, the reaction force of the inner circumferential wall 2124 on the sliding piece 30 can make the sliding piece 30 smoothly retract into the second accommodating cavity 401, so that the battery pack 210 can be timely and smoothly separated and fallen from the electrical equipment 200.

[0062] In some embodiments, referring to FIG. 2-5, the surface of the sliding piece 30 in contact with the inner circumferential wall 2124 is an arc surface. The design of the arc surface enables the sliding piece 30 to be timely and smoothly retracted into the second accommodating cavity 401 when the sliding piece 30 is separated from the inner circumferential wall 2124, so as to ensure that the battery pack 210 can be timely and smoothly separated and fallen from the electrical equipment 200.

[0063] In some embodiments, referring to FIGS. 2-5, the surface of the sliding member 30 in contact with the second connecting end 22 is arc-shaped. Thus, when the connecting rod 20 is extended and the second connecting end 22 pushes the sliding member 30, the sliding member 30 can be extended out of the second accommodating cavity 401 in the direction orthogonal to the thickness direction X through the second through hole 43, so that the sliding member 30 is smoothly extended out of the second accommodating cavity 401, and the connection stability between the first connecting portion 212 and the second connecting portion 221 is ensured.

[0064] In some embodiments, referring to FIGS. 2-5, the surface of the second connecting end 22 in contact with the sliding member 30 is arc-shaped. Thus, when the connecting rod 20 is extended and the second connecting end 22 pushes the sliding member 30, the sliding member 30 can be extended out of the second accommodating cavity 401 in the direction orthogonal to the thickness direction X through the second through hole 43, so that the sliding member 30 is smoothly extended out of the second accommodating cavity 401, and the connection stability between the first connecting portion 212 and the second connecting portion 221 is ensured.

[0065] In some embodiments, referring to FIGS. 3 and 5, the surface of the sliding member 30 facing the first wall 2121 in the thickness direction X is provided with a stop portion 31 protruding in the thickness direction X, specifically, the stop portion 31 protrudes in the thickness direction X on the side of the sliding member 30 facing the first wall 2121. When the connecting rod 20 is extended in the thickness direction X, the second connecting end 22 pushes the sliding member 30, the sliding member 30 is extended out of the second accommodating cavity 401 in the direction orthogonal to the thickness direction X through the second through hole 43 and moves to abut against the inner peripheral wall 2124, the stop portion 31 abuts against the accommodating member 40, specifically, the stop portion 31 abuts against the side wall 42 of the accommodating member 40. The stop portion 31 can limit the movement of the sliding member 30 in the direction orthogonal to the thickness direction X, so that the sliding member 30 can be completely extended out of the second accommodating cavity 401 by the second connecting end 22, and the sliding member 30 can be smoothly retracted into the second accommodating cavity 401 when the connecting rod 20 is retracted.

[0066] In some embodiments, referring to FIGS. 2-5, the number of sliding members 30 is at least two, and the at least two sliding members 30 are arranged at intervals in the circumferential direction of the connecting rod 20. The plurality of sliding members 30 can be simultaneously pushed by the second connecting end 22 to abut against the first wall 2121 when the connecting rod 20 is extended, so that the connection stability between the sliding member 30 and the first connecting portion 212 is ensured, and the connection stability between the first connecting portion 212 and the second connecting portion 221 is ensured.

[0067] In some embodiments, referring to FIGS. 6-7, the driving member 10 can drive the connecting rod 20 to rotate and extend or retract along the thickness direction X. Among the first connecting portion 212 and the second connecting portion 221, at least the first connecting portion 212 is threadedly connected with the connecting rod 20. In the embodiment shown in FIGS. 6 and 7, the connecting rod 20 rotates and extends along the thickness direction X, the connecting rod 20 penetrates the second connecting portion 221 and the first connecting portion 212 in sequence, the connecting rod 20 is threadedly connected with the first connecting portion 212, thereby realizing the fixed connection between the connecting rod 20 and the first connecting portion 212, the first connecting portion 212 is connected with the second connecting portion 221 through the connecting rod 20, so that the battery pack 210 is fixedly installed in the first accommodating cavity 2201 of the carrier 220; the connecting rod 20 rotates and retracts along the thickness direction X, so that the connection between the connecting rod 20 and the first connecting portion 212 is released, the first connecting portion 212 is separated from the second connecting portion 221, and the battery pack 210 falls from the first accommodating cavity 2201 by its own weight. Compared with the structure that the first accommodating cavity 2120 is arranged in the first connecting portion 212 in the embodiment shown in FIGS. 2-5, the first connecting portion 212 in the embodiment shown in FIGS. 6-7 is not provided with the first accommodating cavity 2120, but a insertion hole 2127 is formed on the first connecting portion 212 and penetrates the first connecting portion 212 along the thickness direction X, the connecting rod 20 is threadedly connected with the first connecting portion 212 through the insertion hole 2127, so as to realize the fixed connection between the connecting rod 20 and the first connecting portion 212, thereby simplifying the processing and manufacturing process and reducing the production cost.

[0068] In some embodiments, referring to FIGS. 1-2, 4 and 6-9, the driving member 10 is arranged on the carrier 220, specifically, the driving member 10 is arranged on the inner wall of the carrier 220, so that the self-discharging structure 100 does not affect the falling of the battery pack 210, and the smoothness of the falling of the battery pack 210 is ensured.

[0069] In some embodiments, the driving member 10 is arranged on the box 211 of the battery pack 210, specifically, the first connecting portion 212 is arranged on the side surface 2111 of the box 211, the driving member 10 is arranged on the side surface 2111, and the self-discharging structure 100 falls from the first accommodating cavity 2201 together with the battery pack 210; the first connecting portion 212 is arranged on the top surface 2112 of the box 211, and the driving member 10 is also arranged on the top surface 2112.

[0070] In some embodiments, referring to FIGS. 8-12, the driving member 10 drives the connecting rod 20 to rotate to realize the connection and separation between the first connecting portion 212 and the second connecting portion 221. Specifically, referring to FIGS. 9 and 11, the first connecting portion 212 is provided with a third through hole 2125 penetrating the first connecting portion 212 along the thickness direction X, and referring to FIGS. 11 and 12, the inner side wall of the first connecting portion 212 is provided with a receiving groove 2126, the opposite ends of the receiving groove 2126 along the thickness direction X penetrate the first connecting portion 212 to form a through groove structure, and referring to FIGS. 9 and 10, the second connecting end 22 of the connecting rod 20 is provided with a protruding portion 23 protruding from the side wall of the connecting rod 20 along a direction orthogonal to the thickness direction X. The protruding portion 23 and the receiving groove 2126 one-to-one correspond in number.

[0071] In assembly, the first connecting end 21 of the connecting rod 20 is inserted into the third through hole 2125 and penetrates the second connecting portion 221 from the side of the first connecting portion 212 away from the second connecting portion 221, and then the first connecting end 21 is connected with the driving end of the driving member 10. The driving member 10 drives the connecting rod 20 to rotate until the protruding portion 23 abuts against the side of the first connecting portion 212 away from the second connecting portion 221 along the thickness direction X, so that the first connecting portion 212 is connected with the second connecting portion 221 through the connecting rod 20, realizing the assembly of the battery pack 210 in the first accommodating cavity 2201 of the bearing member 220; the driving member 10 drives the connecting rod 20 to rotate until the protruding portion 23 and the receiving groove 2126 in the first connecting portion 212 are oppositely arranged along the thickness direction X, the first connecting portion 212 loses the support of the protruding portion 23, and the battery pack 210 falls by its own weight, and in the falling process, the protruding portion 23 slides out of the receiving groove 2126 along the thickness direction X, so that the first connecting portion 212 is separated from the second connecting portion 221.

[0072] Specifically, as shown in the embodiment shown in FIG. 10, the number of protrusions 23 is four, which surrounds the connecting rod 20 in the circumferential direction of the connecting rod 20. Specifically, as shown in the embodiments shown in FIGS. 11 and 12, the number of accommodation grooves 2126 is four, which is arranged in the circumferential direction of the third through hole 2125, forming a four-leaf clover cross-sectional structure. Referring to FIGS. 9 and 12, the driving member 10 drives the connecting rod 20 to rotate, and the connecting rod 20 drives the protrusions 23 to rotate, until the protrusions 23 abut against the side of the first connecting portion 212 that is away from the second connecting portion 221 in the thickness direction X, the protrusions 23 form support for the first connecting portion 212 in the thickness direction X, so that the first connecting portion 212 and the second connecting portion 221 are stacked in the thickness direction X, so that the battery pack 210 is installed in the first accommodating cavity 2201 of the carrier 220; referring to FIG. 11, the driving member 10 drives the connecting rod 20 to rotate, and the connecting rod 20 drives the protrusions 23 to rotate, until the protrusions 23 are embedded in the accommodation grooves 2126, the through groove structure of the accommodation grooves 2126, so that the first connecting portion 212 loses the support of the protrusions 23, and the battery pack 210 relies on its own weight to fall, during the falling process, the protrusions 23 slide in the thickness direction X in the accommodation grooves 2126, until the first connecting portion 212 is separated from the protrusions 23 and the second connecting portion 221, so that the battery pack 210 falls from the first accommodating cavity 2201, thereby realizing the timely and smooth dismounting and separation of the battery pack 210 from the electrical equipment 200, avoiding the spread of the thermal runaway battery pack 210 to other components of the electrical equipment 200, and ensuring the safe use of the electrical equipment 200.

[0073] In some embodiments, referring to FIG. 9, the self-discharging structure 100 further comprises a buffer 50, which is arranged between the first connecting portion 212 and the second connecting portion 221, and the connecting rod 20 penetrates the buffer 50 in the thickness direction X. The arrangement of the buffer 50 can form a spacing between the opposite sides of the first connecting portion 212 and the second connecting portion 221, avoiding the friction loss affecting the service life due to the direct contact between the first connecting portion 212 and the second connecting portion 221. Among them, the buffer 50 can be a compressible component such as a spring or elastic foam.

[0074] In some embodiments, the present application provides an electrical equipment 200, referring to FIGS. 13-14 and 17, the electrical equipment 200 comprises a battery pack 210, a carrier 220, a controller 230, a communication wire harness 231, a control wire harness 232, and the self-discharging structure 100 as described above.

[0075] Referring to FIG. 17, the battery pack 210 includes a box 211, a first connecting part 212, a battery management assembly 213, battery cells 214, and a collection harness 215. The box 211 is internally provided with a second accommodating cavity 2110, the battery cells 214 and the battery management assembly 213 are arranged in the second accommodating cavity 2110, as shown in FIGS. 1-2, 4, 6-8, 14-16, the first connecting part 212 is protrudingly arranged on a side surface 2111 of the box 211, as shown in FIG. 17, one end of the collection harness 215 is connected with the battery cells 214 to collect data of the battery cells 214, the other end of the collection harness 215 is connected with the battery management assembly 213 to transmit the collected data to the battery management assembly 213, the battery management assembly 213 includes a BMS (Battery Management System) and a BDU (Battery disconnect Unit), and the battery management assembly 213 is used to collect the data collected by the collection harness 215. The collection harness 215 monitors the state of the battery cells 214 through sensors arranged on the battery cells 214, the sensors include voltage sensors, smoke monitors, temperature sensors, etc., and the battery management assembly 213 monitors the voltage, smoke, temperature, etc. of the battery cells 214 through the collection harness 215.

[0076] Referring to FIGS. 1-9, the carrier 220 includes a second connecting part 221, as shown in FIGS. 1-2, 4, 6-9, 14, and 17, the carrier 220 is internally provided with a first accommodating cavity 2201, and the second connecting part 221 is arranged in the first accommodating cavity 2201, and the second connecting part 221 is overlaid with the first connecting part 212 along the thickness direction X.

[0077] Referring to FIG. 17, the controller 230 is arranged on the carrier 220, and the controller 230 is located outside the first accommodating cavity 2201, one end of a communication harness 231 is connected with the battery management assembly 213, and the other end is connected with the controller 230, one end of a control harness 232 is connected with the drive member 10 in the self-unloading structure 100, and the other end is connected with the controller 230, the controller 230 controls the drive member 10 to start through the control harness 232, and then controls the connecting rod 20 in the embodiment shown in FIGS. 1-7 to stretch out or contract along the thickness direction X, or controls the connecting rod 20 in the embodiment shown in FIGS. 8-12 to rotate, and then controls the overlaid or separated state between the first connecting part 212 and the second connecting part 221, so as to form the control of the assembly or falling of the battery pack 210 in the first accommodating cavity 2201.

[0078] Specifically, the battery management assembly 213 collects the voltage, smoke, temperature and other state data of the battery monomer 214 collected by the collection wire harness 215, and the battery management assembly 213 transmits the collected data to the controller 230 in real time through the communication wire harness 231.

[0079] The controller 230 determines the running state of the battery pack 210 by processing the data transmitted by the battery management assembly 213, that is, determines whether the battery monomer 214 in the battery pack 210 has abnormal conditions such as thermal runaway or overcharge and overdischarge;

[0080] When the controller 230 determines that the battery monomer 214 in the battery pack 210 does not have abnormal conditions according to the transmitted data, the drive member 10 in the self-discharging structure 100 is controlled through the control wire harness 232, the drive member 10 is inaction, and the superimposed state of the first connecting part 212 and the second connecting part 221 is maintained, and the assembled state of the battery pack 210 in the bearing member 220 is maintained;

[0081] When the controller 230 determines that the battery monomer 214 in the battery pack 210 has abnormal conditions according to the transmitted data, the drive member 10 in the self-discharging structure 100 is controlled through the control wire harness 232, the drive member 10 controls the connecting rod 20 shown in Figures 1-7 to contract in the thickness direction X until the connecting rod 20 is disconnected from the first connecting part 212, or the drive member 10 controls the connecting rod shown in Figures 8-12 to rotate until the connecting rod 20 is disconnected from the first connecting part 212, so that the battery pack 210 falls from the first accommodating cavity 2201 of the bearing member 220 by relying on its own weight, avoiding the battery pack 210 with abnormal conditions affecting other components of the electrical equipment 200, and ensuring the use safety of the electrical equipment 200.

[0082] The above describes the technical solutions provided by the embodiments of the present application in detail, and the principles and implementation modes of the present application are described by applying specific examples; the above examples are only used to help understand the method and core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above description should not be understood as limiting the present application.

Claims

1. A self-discharging structure, characterized by, The self-unloading structure is used for loading and unloading the battery pack in the electrical equipment; The electrical equipment comprises the battery pack and a carrier; The carrier is internally provided with a first accommodating cavity, and the carrier comprises a second connecting portion arranged in the first accommodating cavity; The battery pack is arranged in the first accommodating cavity, and the battery pack comprises a box body, the box body is protrusively provided with a first connecting portion, the first connecting portion has a thickness direction, and the second connecting portion is stacked with the first connecting portion along the thickness direction; The self-unloading structure is arranged in the first accommodating cavity and comprises: a driving member arranged on a side of the second connecting portion away from the first connecting portion in the thickness direction; a connecting rod comprising a first connecting end and a second connecting end oppositely arranged along the thickness direction, the first connecting end being connected with the driving member, and the driving member being capable of driving the connecting rod to extend or contract along the thickness direction; along the thickness direction, the connecting rod extends to the second connecting end penetrating through the second connecting portion and being connected with the first connecting portion, so as to fixedly install the battery pack in the first accommodating cavity; the connecting rod contracts to disconnect the first connecting portion and the second connecting portion, so that the battery pack is separated from the carrier and falls off.

2. The self-discharging structure of claim 1, wherein, The first connecting portion is internally provided with a first accommodating cavity, and the first connecting portion comprises a first wall facing the second connecting portion in the thickness direction; The self-unloading structure further comprises a sliding member arranged in the first accommodating cavity; along the thickness direction, the connecting rod extends, the second connecting end pushes the sliding member to abut against the first wall through the sliding member, and the connecting rod is connected with the first connecting portion; the connecting rod contracts to separate the sliding member from the first wall and disconnect the connecting rod and the first connecting portion.

3. The self-discharging structure of claim 2, wherein, The self-unloading structure further comprises a containing member; The containing member is internally provided with a second accommodating cavity, the containing member penetrates through the second connecting portion along the thickness direction and is inserted into the first accommodating cavity, a second through hole is formed in the containing member located in the first accommodating cavity to communicate the first accommodating cavity and the second accommodating cavity; The sliding member is arranged in the second accommodating cavity; The connecting rod is inserted into the second accommodating cavity, the connecting rod extends, the second connecting end pushes the sliding member, part of the sliding member can extend out of the second through hole and abut against the first wall, and the connecting rod contracts to separate the second connecting end from the sliding member, and the sliding member can be retracted into the second accommodating cavity from the second through hole and separated from the first wall.

4. A self-discharging structure as claimed in any one of claims 1 to 3, wherein, The self-unloading structure further comprises a buffer member arranged between the first connecting portion and the second connecting portion, and the connecting rod penetrates through the buffer member along the thickness direction.

5. A self-discharging structure as claimed in claim 2 or 3, wherein, A first through hole is formed in the first wall and communicates with the first accommodating cavity, and the first wall has an inner circumferential wall surrounding the first through hole along a circumferential direction of the first through hole. The second connecting end pushes the sliding piece, and the sliding piece moves to abut against the inner circumferential wall; the second connecting end is separated from the sliding piece, and the sliding piece moves to be separated from the inner circumferential wall. The surface of the sliding piece in contact with the inner circumferential wall is an arc surface.

6. The self-discharging structure of claim 5, wherein, The surface of the sliding piece in contact with the second connecting end is an arc surface, and / or the surface of the second connecting end in contact with the sliding piece is an arc surface.

7. The self-discharging structure of claim 5, wherein, A stopper is arranged on the surface of the sliding piece facing the first wall in the thickness direction; The sliding piece moves to abut against the inner circumferential wall, and the stopper abuts against the accommodating piece.

8. The self-discharging structure of claim 2, wherein, The number of the sliding pieces is at least two, and the at least two sliding pieces are arranged at intervals in the circumferential direction of the connecting rod.

9. The self-discharging structure of claim 1, wherein, An accommodating groove is arranged on the inner side wall of the first connecting part, and the accommodating groove forms a through groove structure penetrating the first connecting part at opposite ends in the thickness direction.

10. The self-discharging structure of claim 9, wherein, The second connecting end is provided with a protruding part, which protrudes on the side wall of the connecting rod in a direction orthogonal to the thickness direction, and the number of the protruding part corresponds to that of the accommodating groove.

11. The self-discharging structure of claim 1, wherein, A plug hole penetrating the first connecting part in the thickness direction is arranged on the first connecting part, and the connecting rod is connected to the first connecting part through the plug hole.

12. The self-discharging structure of claim 1, wherein, The driving piece can drive the connecting rod to rotate and extend or contract in the thickness direction. Among the first connecting part and the second connecting part, at least the first connecting part is threadedly connected to the connecting rod.

13. The self-discharging structure of claim 1, wherein, The driving piece is arranged on the bearing piece, or the driving piece is arranged on the box.

14. An electrical device, characterized by Comprise: A battery pack comprising a box and a battery management assembly, a first connecting part protruding on the box, the first connecting part having a thickness direction, and the battery management assembly arranged inside the box; A bearing piece provided with a second connecting part, the second connecting part being stacked with the first connecting part in the thickness direction; A controller, the battery management assembly being in communication connection with the controller; and The self-unloading structure of any one of claims 1-13, the driving piece in the self-unloading structure being in communication connection with the controller, and the controller driving the connecting rod to extend or contract in the thickness direction by controlling the driving piece.

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