Smoke exhaust assembly, battery pack and electric equipment

Abstract

The utility model provides a smoke exhaust assembly, a battery pack and electric equipment, and relates to the technical field of batteries. The smoke exhaust assembly is applied to the battery pack and comprises a flue, a first connecting piece, a second connecting piece and a third connecting piece, the flue is in a hollow pipe shape, and a smoke outlet communicated with the interior of the flue is formed in the flue. The first connecting piece is connected to the flue, is arranged close to one end of the flue and is used for being connected with a box body of the battery pack; the second connecting piece is connected to the flue, is arranged close to the other end of the flue and is used for being connected with a box body of the battery pack; and the third connecting piece is connected to the flue, is arranged between the first connecting piece and the second connecting piece and is used for being connected with a box body of the battery pack. According to the smoke exhaust assembly provided by the invention, at least three connecting positions are arranged between the flue and the box body of the battery pack, so that the probability of loosening and shaking of the flue can be reduced after the flue is connected with the box body, and thermal runaway substances of the battery monomers can be discharged along the flue in time.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of batteries, and in particular, to a smoke exhaust component, a battery pack, and an electrical device. Background Art

[0002] Due to the principle and structural characteristics of lithium-ion batteries, a large amount of heat is often generated in a short time due to various reasons during repeated use. At the same time, the air pressure inside the battery cell also increases, causing the substances inside the battery cell to finally break through the explosion-proof valve and leak out, that is, the "thermal runaway" phenomenon occurs.

[0003] In order to make the substances ejected from the explosion-proof valve discharge along a specific path and prevent thermal spread, a flue is usually provided in the battery pack, and the substances ejected from the explosion-proof valve are discharged from the flue.

[0004] In the related art, the fixing of the flue is not firm enough, and sometimes the flue loosens and shakes, resulting in the substances discharged from the explosion-proof valve being difficult to accurately enter the flue. Summary of the Utility Model

[0005] In view of the above problems, the embodiments of the present application provide a smoke exhaust component, a battery pack, and an electrical device, which can reduce the probability of the flue loosening and shaking, and is beneficial to the substances in thermal runaway to be discharged along the flue in time.

[0006] According to the first aspect of the embodiments of the present application, a smoke exhaust component is provided. The smoke exhaust component is applied to a battery pack, and the smoke exhaust component includes a flue, a first connecting member, a second connecting member, and a third connecting member; the flue is a hollow tubular shape, and a smoke exhaust port communicating with the inside of the flue is provided on the flue; the first connecting member is connected to the flue and is disposed near one end of the flue for connecting to the box body of the battery pack; the second connecting member is connected to the flue and is disposed near the other end of the flue for connecting to the box body of the battery pack; the third connecting member is connected to the flue and is disposed between the first connecting member and the second connecting member for connecting to the box body of the battery pack.

[0007] By adopting the above scheme, three connecting members are provided on the flue, and the flue can be connected to the box body of the battery pack through the three connecting members. In view of this, there are at least three connection positions between the flue and the box body of the battery pack, so that the probability of the flue loosening and shaking can be reduced after the flue is connected to the box body, which is beneficial to the substances in the battery cell in thermal runaway to be discharged along the flue in time.

[0008] In some embodiments, at least one of the first connecting member, the second connecting member, and the third connecting member is configured as a sleeve, and the sleeve penetrates through the side wall of the flue and is hermetically connected to the side wall of the flue.

[0009] By adopting the above scheme, since the sleeve penetrates through the side wall of the flue, when connecting the flue to the box body of the battery pack, the connecting components can pass through the sleeve and connect the sleeve to the box body. Since the sleeve is sealingly connected to the side wall of the flue, only by connecting the sleeve to the box body can the fixation between the flue and the box body be achieved. Moreover, when connecting the sleeve to the box body, there is no need to consider the sealing between the connecting components and the flue, the connection is simpler, and the assembly efficiency of the flue and the box body is higher.

[0010] In some embodiments, the sleeve is in a "T" shape or an "I" shape.

[0011] By adopting the above scheme, one end or both ends of the sleeve have larger dimensions and the middle part has smaller dimensions. When part of the sleeve is located inside the flue, the obstruction to the flue gas flow is smaller, which is beneficial to the flue gas passing through the flue. And the connection area between the end of the sleeve and the side wall of the flue is larger, which is beneficial to increasing the connection strength between the sleeve and the flue.

[0012] In some embodiments, both ends of the sleeve protrude from the outer wall of the flue.

[0013] By adopting the above scheme, after the bolt connects the sleeve to the box body, the components adjacent to the sleeve can abut against the end of the sleeve and will not squeeze the flue, so that on the basis of protecting the flue from being squeezed and damaged, the connection firmness between the sleeve and the box body is ensured, and further the connection stability between the box body and the flue is ensured.

[0014] In some embodiments, an insulating protective layer is coated on the outer wall of the flue.

[0015] By adopting the above scheme, the insulating protective layer can insulate and isolate the flue from other components, preventing the flue from contacting the conductive components of the battery pack and causing abnormal circuits of the battery pack.

[0016] According to the second aspect of the embodiments of the present application, a battery pack is provided, including a box body, a battery module and the smoke exhaust assembly in any of the above embodiments. The box body includes at least three reinforcing beams, and accommodation cavities are formed between adjacent reinforcing beams; the battery module is arranged in the accommodation cavity, and an explosion-proof valve is arranged on one side of the battery module; the flue of the smoke exhaust assembly is arranged opposite to the explosion-proof valve, and the first connecting piece, the second connecting piece and the third connecting piece of the smoke exhaust assembly are respectively connected to one of the reinforcing beams.

[0017] By adopting the above solution, multiple accommodation cavities of the box body can accommodate the battery modules and limit the positions of the battery modules. The explosion-proof valve actuates when the internal pressure of the corresponding battery cell reaches a preset value to release the internal pressure of the battery cell. The substance ejected from the explosion-proof valve can break through the flue opposite to the explosion-proof valve and enter the flue, and finally be discharged along the flue, preventing it from affecting other battery cells. The first connecting member, the second connecting member, and the third connecting member of the smoke exhaust assembly are respectively connected to one of the reinforcing beams, so that the flue is fixed to the box body at at least three positions. Therefore, after the flue is connected to the box body, the probability of the flue becoming loose and shaking can be reduced, preventing the situation where the substance ejected from the explosion-proof valve cannot break through and enter the flue. In addition, the box body is connected to the smoke exhaust assembly through the first connecting member, the second connecting member, and the third connecting member, rather than directly connected to the flue, preventing the sealing performance of the flue from being damaged during the connection process, which is beneficial to ensuring that the substance entering the flue is only discharged along the smoke exhaust port.

[0018] In some embodiments, when at least one of the first connecting member, the second connecting member, and the third connecting member is configured as a sleeve that penetrates the side wall of the flue and is hermetically connected to the side wall of the flue, the battery pack further includes a protective plate and a connecting bolt. The protective plate covers the side of the box body close to the flue, and the connecting bolt passes through the protective plate and the inner hole of the sleeve and then is connected to the reinforcing beam.

[0019] By adopting the above solution, using the connecting bolt to connect the sleeve and the reinforcing beam has a lower cost and is convenient for connection. The connecting bolt passes through the protective plate and the inner hole of the sleeve and then is connected to the reinforcing beam, so that the connecting bolt connects the protective plate and the flue to the reinforcing beam at the same time, improving the assembly efficiency of the box body, the smoke exhaust assembly, and the protective plate.

[0020] In some embodiments, a sealing ring is sleeved on the connecting bolt. One sealing ring is disposed between the protective plate and the flue, and the other sealing ring is disposed between the flue and the reinforcing beam.

[0021] Since the connecting bolt is connected to the protective plate, the air outside the protective plate may enter the interior of the battery pack along the direction in which the connecting bolt extends. After the sealing rings are provided, the sealing rings form seals between the protective plate and the flue, and between the flue and the reinforcing beam, so that the air outside the protective plate will not leak from these places after entering along the connecting bolt, thereby preventing the components inside the box body of the battery pack from being contaminated and corroded.

[0022] According to the third aspect of the embodiments of the present application, an electrical device is provided, including the battery pack in any of the above embodiments.

[0023] Since the connection between the flue of the battery pack and the box body is relatively firm, it can prevent the situation where the substance ejected from the explosion-proof valve cannot break through and enter the flue. Therefore, the electrical device has higher safety.

[0024] In the embodiments of the present application, by providing a first connecting member, a second connecting member, and a third connecting member on the flue, there are at least three connecting positions between the flue and the box body of the battery pack. Therefore, after the flue is connected to the box body, the probability of the flue becoming loose and shaking can be reduced, which is conducive to the timely discharge of substances during the thermal runaway of the battery monomer along the flue, preventing the further spread of thermal runaway, improving the use safety of the battery pack using the flue, and further improving the safety of the electrical equipment using the battery pack.

[0025] The above description is only an overview of the technical solutions in the embodiments of the present application. In order to understand the technical means of the embodiments of the present application more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features, and advantages of the embodiments of the present application more obvious and understandable, the specific embodiments of the present application are specifically given below. Brief Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 It is a schematic structural diagram of a smoke exhaust component provided by an embodiment of the present application.

[0028] Figure 2 For Figure 1 It is a cross-sectional view of the smoke exhaust component in

[0029] Figure 3 It is an exploded view of a battery pack provided by an embodiment of the present application.

[0030] Figure 4 It is a schematic structural diagram of a battery pack provided by an embodiment of the present application after removing the protective plate.

[0031] Figure 5 For Figure 4 It is an enlarged structural diagram of part A in

[0032] Figure 6 For Figure 4 It is an enlarged structural diagram of part B in

[0033] Figure 7 For Figure 4 It is a sectional structural diagram of the A-A plane in

[0034] Figure 8 For Figure 7 It is an enlarged structural diagram of part C in

[0035] Description of the reference numerals: 1000, battery pack; 100, smoke exhaust assembly; 110, flue; 111, smoke outlet; 120, first connecting member; 130, second connecting member; 140, third connecting member; 141, sleeve; 150, insulation protection layer; 200, battery module; 210, explosion-proof valve; 300, box body; 310, reinforcing beam; 400, guard plate; 500, connecting bolt; 600, sealing ring. Detailed implementation manners

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of this application without creative efforts shall fall within the protection scope of this application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0038] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the accompanying drawings are intended to cover but not exclude other elements. The word "a" or "an" does not exclude the presence of a plurality.

[0039] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0040] The term "and / or" herein is merely a description of the associated relationship of the associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0041] The directional terms used in the following description are all the directions shown in the figures, and do not limit the specific structures of the smoke exhaust assembly, battery pack or electrical equipment of the present application. For example, in the description of the present application, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present application.

[0042] In addition, terms such as "first", "second", etc. in the description, claims or the above-mentioned drawings of the present application are used to distinguish different objects, rather than to describe a specific order, and may explicitly or implicitly include one or more of such features.

[0043] In the description of the present application, unless otherwise specified, the meaning of "a plurality" means two or more (including two). Similarly, "a plurality of groups" means two or more groups (including two groups).

[0044] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, the "connection" or "coupling" of a mechanical structure may refer to a physical connection. For example, a physical connection may be a fixed connection, such as a fixed connection through a fixing member, such as a screw, bolt or other fixing member; a physical connection may also be a detachable connection, such as a snap connection or a snap-fit connection; a physical connection may also be an integral connection, such as a welded connection, an adhesive connection or an integral molding connection. The "connection" or "coupling" of a circuit structure may refer to not only a physical connection, but also an electrical connection or a signal connection. For example, it may be a direct connection, that is, a physical connection, or it may be indirectly connected through at least one intermediate element, as long as the circuit is connected, and it may also be the communication inside two elements; a signal connection may refer to not only a signal connection through a circuit, but also a signal connection through a media medium, such as radio waves. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0045] The present application discloses a smoke exhaust assembly, a battery pack and an electrical equipment. The above battery pack includes the above smoke exhaust assembly, the above electrical equipment includes the above battery pack, and the above battery pack can provide electrical energy for the electrical equipment.

[0046] Among them, the above-mentioned electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, power tools, energy storage devices, amusement equipment, elevators, and lifting equipment, etc. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc.; the spacecraft includes airplanes, rockets, space shuttles, and spaceships, etc.; the electric toys include fixed or mobile electric toys, for example, game consoles, electric vehicle toys, electric ship toys, or electric airplane toys, etc.; the power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact electric drills, concrete vibrators, and electric planers, etc.; the energy storage device can be an energy storage wall, base station energy storage, container energy storage, etc.; the amusement equipment can be a carousel, a drop tower, etc. This application does not impose special restrictions on the above-mentioned electrical equipment.

[0047] For new energy vehicles, the above-mentioned battery pack can be used as a drive power source to replace fossil fuels and provide driving power.

[0048] Specifically, the battery pack includes a battery management system (BMS) and multiple above-mentioned battery cells. The multiple battery cells can be electrically connected in series, in parallel, or in a mixed way of series and parallel, and communicate with the battery management system to form a battery pack. The above-mentioned battery management system controls and monitors the working states of each battery cell. In addition, multiple battery cells can also be first connected in series and / or in parallel and form a battery module with a module management system, and then multiple battery modules are electrically connected in series, in parallel, or in a mixed way of series and parallel, and jointly constitute a battery pack with the battery management system.

[0049] Among them, the multiple battery cells in the above-mentioned battery pack or battery module can be installed on support structures such as boxes, frames, and brackets. The battery cells can be electrically connected through busbar components such as busbars. The above-mentioned battery cells can be lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, and their external contours can be cylindrical, flat, cuboid, or other shapes, but are not limited thereto.

[0050] Generally, a battery cell includes a housing and an electrode assembly. The electrode assembly is accommodated in the housing. The electrode assembly is the smallest unit for electrochemical reactions in the battery, realizing the charge and discharge of the battery cell, and generally includes a positive electrode plate, a negative electrode plate, and a separator that separates the positive electrode plate and the negative electrode plate. The housing is filled with an electrolyte, and the electrolyte can infiltrate into the electrode assembly to provide an ion migration path for the electrode assembly to carry out electrochemical reactions and play a role in conducting electricity.

[0051] During the use of the battery pack, chemical reactions occur in each battery cell. Once a problem occurs in a certain battery cell, it may lead to abnormal reactions inside the battery cell, and the temperature and pressure inside the housing of the battery cell will increase instantaneously, eventually breaking through the housing and discharging high-temperature and high-pressure flue gas.

[0052] Some battery packs in the relevant technology center are provided with flue ducts. When the battery cell ejects flue gas, it breaks through the flue duct at the corresponding position. After the flue gas enters the flue duct, it is discharged along the flue duct to the exhaust valve at the end of the flue duct and discharged from the exhaust valve.

[0053] However, during actual use, there are sometimes situations where high-temperature flue gas cannot enter the flue duct, causing the flue gas ejected from the battery cell to spread to other battery cells in the battery pack, triggering a series of chain reactions.

[0054] The inventor found through research that this is because the installation of the flue duct in the battery pack is sometimes unstable. Especially when the flue duct is long, the flue duct is only fixed at both ends and suspended in the middle, resulting in the flue duct being prone to shaking or bending deformation. As a result, the explosion-proof valve of the battery cell cannot be aligned with the flue duct, and the substances ejected during thermal runaway are also difficult to enter the flue duct.

[0055] In view of this, the present application provides a smoke exhaust assembly, and the smoke exhaust assembly 100 is applied to the battery pack 1000. Figure 1 It is a schematic structural diagram of the smoke exhaust assembly provided by the embodiment of the present application. Figure 2 For Figure 1 The cross-sectional view of the smoke exhaust assembly in

[0056] As Figure 1 And Figure 2 As shown in

[0057] The flue duct 110 is a hollow tubular structure made of metal. The side wall of the flue duct 110 needs to be broken through by the high-temperature substances ejected from the explosion-proof valve 210 of the battery cell during battery thermal runaway so that the high-temperature substances can enter the flue duct 110. Therefore, the side wall of the flue duct 110 should not be too thick to prevent the situation where it cannot be broken through by the high-temperature substances.

[0058] In addition, the flue 110 can be a spliced structure formed by connecting multiple pipes, or it can be composed of a single pipe. In the Figure 1 and Figure 2 example, the flue 110 is composed of two pipes welded together.

[0059] The number of exhaust outlets 111 is one or more, and the exhaust outlets 111 can be arranged at the end or the side wall of the flue 110. Exemplarily, when the flue 110 has one exhaust outlet 111 and this exhaust outlet 111 is arranged at one end of the flue 110, the other end of the flue 110 is closed so that the high-temperature substances in the flue 110 can only flow towards one end of the flue and finally be discharged from the exhaust outlet 111; when this one exhaust outlet 111 is arranged on the side wall of the flue 110, both ends of the flue 110 are closed to prevent the high-temperature substances in the flue 110 from being discharged from both ends of the flue 110. In the case where the flue 110 is spliced by multiple pipes, the spaces inside the multiple pipes communicate with each other, and the exhaust outlet 111 is arranged on one of the pipes.

[0060] The structures of the first connector 120, the second connector 130, and the third connector 140 can be the same or different. In addition, the connections of the first connector 120, the second connector 130, and the third connector 140 to the box body 300 can be the same or different, and the embodiments of the present application do not limit this.

[0061] By adopting the above solution, three connectors are arranged on the flue 110, and through the three connectors, the flue 110 can be connected to the box body 300 of the battery pack 1000. In view of this, there are at least three connection positions between the flue 110 and the box body 300 of the battery pack 1000, so that the probability of the flue 110 becoming loose and shaking can be reduced after the flue 110 is connected to the box body 300, which is beneficial to the substances in the battery cell thermal runaway to be discharged along the flue 110 in time.

[0062] Taking the first connector 120 as an example, the first connector 120 can be a metal part and is welded to one side of the flue 110 by welding, or the first connector 120 is first sleeved on the flue 110 and then welded to the periphery of the flue 110. A connection hole is arranged on the first connector 120, and the orientation of the connection hole avoids the flue 110 so as to facilitate the tightening of the connection bolt 500 when the connection bolt 500 is arranged inside the connector.

[0063] The second connector 130 and the third connector 140 can also adopt the above solution. Figure 1 and Figure 2In the exhaust component 100 shown, the first connecting member 120 is connected to the flue 110 by sleeving on the flue 110 and welding to the flue 110, and the second connecting member 130 is connected to the flue 110 by welding to a surface of the flue 110.

[0064] As Figure 1 and Figure 2 shown, in some embodiments, at least one of the first connecting member 120, the second connecting member 130 and the third connecting member 140 is configured as a sleeve 141, and the sleeve 141 penetrates the side wall of the flue 110 and is hermetically connected to the side wall of the flue 110.

[0065] The sleeve 141 is generally provided with an inner hole, and the sleeve 141 penetrates the side wall of the flue 110. Thus, when connecting the flue 110 to the box body 300 of the battery pack 1000, the connecting component can pass through the sleeve 141 and connect the sleeve 141 to the box body 300. During the process of connecting the sleeve 141 to the box body 300 by the connecting component, the connecting component and the flue 110 may not be in direct contact, but the sleeve 141 is used to bear the connecting force. Therefore, the flue 110 is not easily damaged by extrusion and rupture.

[0066] Since the sleeve 141 is hermetically connected to the side wall of the flue 110, the setting of the sleeve 141 on the flue 110 does not affect the sealing performance of the flue 110, and thus it is not easy to cause high-temperature substances to leak from the inside of the flue 110 to the outside of the flue 110.

[0067] Through the above solution, connecting the sleeve 141 to the box body 300 can achieve the fixation of the flue 110 and the box body 300. Moreover, when connecting the sleeve 141 to the box body 300, there is no need to consider the seal between the connecting component and the flue 110, the connection is simpler, and the assembly efficiency of the flue 110 and the box body 300 is higher.

[0068] In Figure 1 and Figure 2 the exhaust component 100 shown, the third connecting member 140 is configured as a sleeve 141, and the black circles in the figure are the cross-sections of the welding parts of the sleeve 141 and the flue 110.

[0069] Exemplarily, the connecting component is a bolt. When connecting the exhaust component 100 to the box body 300, the bolt passes through the inner hole of the sleeve 141 and then is connected to the box body 300, thereby fixing the flue 110 on the box body 300.

[0070] As Figure 2 shown, in some embodiments, the sleeve 141 is in a "T" shape or an "I" shape. Figure 2 Only the sleeve 141 in the "T" shape is schematically shown in

[0071] By adopting the above solution, one or both ends of the sleeve 141 have larger dimensions and the middle part has smaller dimensions. When part of the sleeve 141 is located in the flue 110, the obstruction to the flue gas flow is small, which is beneficial to the flue gas passing through the flue 110. And the connection area between the end of the sleeve 141 and the side wall of the flue 110 is large, which is beneficial to increasing the connection strength between the sleeve 141 and the flue 110.

[0072] Optionally, as Figure 2 shown, both ends of the sleeve 141 protrude from the outer wall of the flue 110.

[0073] In the embodiment of the present application, there is no limit to the amount by which the end of the sleeve 141 protrudes from the outer wall of the flue 110, as long as the end of the sleeve 141 and the corresponding outer wall of the flue 110 are not in the same plane.

[0074] By adopting the above solution, after the connecting bolt 500 connects the sleeve 141 to the box body 300, the components adjacent to the sleeve 141 can abut against the end of the sleeve 141 and will not squeeze the flue 110. Thus, on the basis of protecting the flue 110 from being squeezed and damaged, the connection firmness between the sleeve 141 and the box body 300 is ensured, and further the connection stability between the box body 300 and the flue 110 is ensured.

[0075] Among them, the components adjacent to the sleeve 141 can be the bolt head of the connecting bolt 500, or the box body 300, or the washer arranged between the box body 300 and the sleeve 141. The embodiment of the present application does not make any limitation thereto.

[0076] As Figure 1 and Figure 2 shown, in some embodiments, an insulating protective layer 150 is coated on the outer wall of the flue 110.

[0077] The insulating protective layer 150 has the function of insulating protection and usually also has the property of high temperature resistance, so it is not easily damaged when the battery cell is thermally out of control.

[0078] Exemplarily, the insulating protective layer 150 can be insulating paint and / or mica cloth. That is to say, the insulating protective layer 150 can only include insulating paint, or only include mica cloth, or can include both insulating paint and mica cloth.

[0079] The insulating paint can be provided on the outer wall of the flue 110 by spraying or brushing, and the mica cloth can be wrapped or wound around the outside of the flue 110.

[0080] The insulating protective layer 150 can insulate and isolate the flue 110 from other components, preventing the flue 110 from contacting the conductive components of the battery pack 1000 and causing abnormal circuits of the battery pack 1000.

[0081] When both insulating paint and mica cloth are provided outside the flue 110, the mica cloth can prevent the insulating paint from burning out and causing the circuit of the battery pack 1000 to short-circuit and fail when the battery thermal runaway occurs, preventing more serious runaway problems in the battery pack 1000 when a single battery cell experiences thermal runaway.

[0082] As Figure 3 and Figure 4 shown, an embodiment of the present application also provides a battery pack. Figure 3 FIG. Figure 4 is an explosion schematic diagram of a battery pack provided by an embodiment of the present application.

[0083] Please refer to Figure 3 and Figure 4 , the battery pack includes a box body 300, a battery module 200, and the smoke exhaust assembly 100 in any of the above embodiments. The box body 300 includes at least three reinforcing beams 310, and an accommodation cavity is formed between adjacent reinforcing beams 310; the battery module 200 is disposed in the accommodation cavity, and an explosion-proof valve 210 is provided on one side of the battery module 200; the flue 110 of the smoke exhaust assembly 100 is disposed opposite to the explosion-proof valve 210, and the first connecting member 120, the second connecting member 130, and the third connecting member 140 of the smoke exhaust assembly 100 are respectively connected to one of the reinforcing beams 310.

[0084] The explosion-proof valve 210 actuates when the internal pressure of the corresponding battery cell reaches a preset value to release the internal pressure of the battery cell. The substance ejected from the explosion-proof valve 210 can break through the flue 110 opposite to the explosion-proof valve 210 and enter the flue 110, and finally be discharged along the flue 110 to prevent affecting other battery cells.

[0085] The reinforcing beam 310 can be a frame of the box body 300 or a spaced member located in the middle of the box body 300, for example, a partition. The reinforcing beams 310 located on both sides of the box body 300 play a role in restricting the boundary of the box body 300, and they can be the front beam and the rear beam of the box body 300. The reinforcing beams 310 located between both sides of the box body 300 are used to partition the box body 300 into multiple accommodation cavities, and each accommodation cavity accommodates a different battery module 200, while the reinforcing beam 310 is used to bear the expansion force of the battery modules 200 on both sides of it, strengthening the strength of the box body 300.

[0086] Figure 5 FIG. Figure 4 is an enlarged structural schematic diagram of the connection between the first connecting member and the reinforcing beam in Figure 6 FIG. Figure 4 is an enlarged structural schematic diagram of the connection between the third connecting member and the reinforcing beam in

[0087] Exemplarily, the number of reinforcing beams 310 can be three, one of which serves as the front side beam, one as the rear side beam, and one as the middle beam; when the number of reinforcing beams 310 is four, one of which serves as the front side beam, one as the rear side beam, and two are spaced between the front side beam and the rear side beam to serve as middle beams.

[0088] Figure 5 for Figure 4 Schematic diagram of the enlarged structure of the connection between the first connecting member and the reinforcing beam. Figure 6 for Figure 4 Schematic diagram of the enlarged structure of the connection between the third connecting member and the reinforcing beam.

[0089] Please refer to Figure 5 and Figure 6 When connecting the smoke exhaust assembly 100, the first connecting member 120 can be connected to the front side beam through the connecting bolt 500, the second connecting member 130 can be connected to the rear side beam through the connecting bolt 500, and the third connecting member 140 can be connected to any middle beam through the connecting bolt 500.

[0090] The above connection structure allows the flue 110 to be fixed to the box body 300 at least at three locations, so that after the flue 110 is connected to the box body 300, the probability of the flue 110 being loosened and shaken can be reduced, and the situation that the substances ejected from the explosion-proof valve 210 cannot break through and enter the flue 110 can be prevented. In addition, the box body 300 is connected to the smoke exhaust assembly 100 through the first connecting member 120, the second connecting member 130 and the third connecting member 140, rather than being directly connected to the flue 110, so as to prevent the sealing of the flue 110 from being damaged during the connection process, which is conducive to ensuring that the substances entering the flue 110 are only discharged along the smoke exhaust port 111.

[0091] Figure 7 for Figure 4 Schematic diagram of the cross-sectional structure of the AA surface in the middle. Figure 8 for Figure 7 The enlarged structure diagram of the C in the figure. Figure 4 In order to illustrate the cutting position of the AA surface, the guard plate is not shown. Figure 7 The position of the guard plate is shown in the figure to facilitate understanding of the assembly relationship between the guard plate and the smoke exhaust assembly.

[0092] Please refer to Figure 3 , Figure 4 , Figure 7 and Figure 8, in some embodiments, when at least one of the first connecting member 120, the second connecting member 130, and the third connecting member 140 is configured as a sleeve 141 that penetrates the side wall of the flue 110 and is sealingly connected to the side wall of the flue 110, the battery pack 1000 further includes a guard plate 400 and a connecting bolt 500. The guard plate 400 covers the side of the box body 300 close to the flue 110, and the connecting bolt 500 is connected to the reinforcing beam 310 after passing through the inner hole of the guard plate 400 and the sleeve 141.

[0093] The guard plate 400 is used to close the opening of the box body 300. Therefore, the guard plate 400 needs to be connected to the box body 300. In the above structure, the connecting bolt 500 passes through the inner holes of the guard plate 400 and the sleeve 141 and then is connected to the reinforcing beam 310, so that the connecting bolt 500 connects the guard plate 400 and the flue 110 to the reinforcing beam 310 at the same time, improving the assembly efficiency of the box body 300, the smoke exhaust assembly 100, and the guard plate 400.

[0094] The guard plate 400 can be made of metal or non-metal material, and its periphery is sealingly connected to the box body 300 to prevent the gas in the external environment from entering the box body 300 and causing corrosion damage to the components inside the box body 300, especially damage to the conductive components inside the box body 300 and damage to the charge and discharge performance of the battery pack 1000.

[0095] Optionally, a sealing gasket can be provided between the guard plate 400 and the box body 300 to ensure the sealing performance between the guard plate 400 and the box body 300.

[0096] Since the connecting bolt 500 is connected to the guard plate 400, the air outside the guard plate 400 may enter the inside of the battery pack 1000 along the direction in which the connecting bolt 500 extends. In view of this, as Figure 7 and Figure 8 shown, in some embodiments, a sealing ring 600 is sleeved on the connecting bolt 500. One sealing ring 600 is provided between the guard plate 400 and the flue 110, and the other sealing ring 600 is provided between the flue 110 and the reinforcing beam 310.

[0097] After the sealing ring 600 is provided, the sealing ring 600 forms a seal between the guard plate 400 and the flue 110, and between the flue 110 and the reinforcing beam 310, so that the air outside the guard plate 400 will not leak from these places after entering along the connecting bolt 500, thereby causing pollution and corrosion to the components inside the box body 300 of the battery pack 1000 and protecting the components inside the box body 300.

[0098] According to the third aspect of the embodiments of the present application, an electrical device is provided, including the battery pack 1000 in any of the above embodiments.

[0099] Since the connection between the flue 110 of the battery pack 1000 and the box body 300 is relatively firm, it can prevent the situation where the substances ejected from the explosion-proof valve 210 cannot break through and enter the flue 110. Therefore, the safety of the electrical equipment is higher.

[0100] In summary, in the embodiment of the present application, by providing the first connecting member 120, the second connecting member 130, and the third connecting member 140 on the flue 110, there are at least three connecting positions between the flue 110 and the box body 300 of the battery pack 1000. Thus, after the flue 110 is connected to the box body 300, the probability of the flue 110 becoming loose and shaking can be reduced, which is conducive to the substances of the thermal runaway of the battery monomer being discharged along the flue 110 in time, preventing the further spread of the thermal runaway, improving the use safety of the battery pack 1000 using the flue 110, and further improving the safety of the electrical equipment using the battery pack 1000.

[0101] Those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments rather than other features, the combination of the features of different embodiments means that it is within the scope of the present application and forms different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0102] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present application.

Claims

1. A smoke exhaust assembly, applied to a battery pack, characterized in that: include: A flue, the flue being in the shape of a hollow tube and provided with a smoke exhaust port communicating with the interior of the flue; A first connecting member, connected to the flue and disposed close to one end of the flue, and used to be connected to the box of the battery pack; A second connecting member, connected to the flue and disposed close to the other end of the flue, and used to be connected to the box of the battery pack; The third connecting member is connected to the flue and is disposed between the first connecting member and the second connecting member, and is used for connecting to the box body of the battery pack.

2. The smoke exhaust assembly according to claim 1, characterized in that: At least one of the first connecting member, the second connecting member and the third connecting member is configured as a sleeve, and the sleeve penetrates through the side wall of the flue and is sealed and connected to the side wall of the flue.

3. The smoke exhaust assembly according to claim 2, characterized in that: The sleeve is in a "T" shape or an "I" shape.

4. The smoke exhaust assembly according to claim 2, characterized in that: Both ends of the sleeve protrude from the outer wall of the flue.

5. The smoke exhaust assembly according to any one of claims 1 to 4, characterized in that: The outer wall of the flue is covered with an insulating protective layer.

6. A battery pack, characterized in that: include: The box body comprises at least three reinforcing beams, and a receiving cavity is formed between adjacent reinforcing beams; A battery module is arranged in the accommodating cavity, and an explosion-proof valve is arranged on one side of the battery module; The smoke exhaust assembly according to any one of claims 1 to 5, wherein the flue of the smoke exhaust assembly is arranged directly opposite to the explosion-proof valve, and the first connecting member, the second connecting member and the third connecting member of the smoke exhaust assembly are respectively connected to one of the reinforcing beams.

7. The battery pack according to claim 6, characterized in that: In a case where at least one of the first connecting member, the second connecting member and the third connecting member is configured as a sleeve, and the sleeve passes through the side wall of the flue and is sealed and connected to the side wall of the flue, the battery pack further includes a guard plate and connecting bolts, the guard plate covers a side of the box body close to the flue, and the connecting bolts pass through the guard plate and the inner holes of the sleeve and are connected to the reinforcing beam.

8. The battery pack according to claim 6, characterized in that: A sealing ring is sleeved on the connecting bolt, one of the sealing rings is arranged between the guard plate and the flue, and the other sealing ring is arranged between the flue and the reinforcing beam.

9. An electrical device, characterized in that: A battery pack comprising any one of claims 6 to 8.

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