Battery device and electric equipment

Abstract

The utility model discloses a battery device and electric equipment, the battery device comprises a battery monomer and a box body, the battery monomer is provided with a main body part and a convex part located at one side of the main body part, and the convex part is arranged in a protruding manner along a first direction; the box body comprises a first box body part and a second box body part which are buckled with each other and define a containing cavity, the battery monomers are arranged in the containing cavity, at least part of the first box body part is located on the side, away from the main body part, of the convex part in the first direction, the first box body part is provided with a concave part, and the orthographic projection of the concave part covers the orthographic projection of the convex part in the first direction; and the convex part at least partially extends into the concave part. According to the battery monomer provided by the embodiment of the invention, the heat dissipation performance can be improved, and the reliability is improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery device and electrical equipment. Background Art

[0002] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] The development of battery technology must consider many design factors at the same time. For example, how to improve the structural strength of battery devices and reduce the size of battery devices is an important research direction in the battery field. Utility Model Content

[0004] The present application provides a battery device and an electrical device, which can improve structural strength and reduce volume.

[0005] In the first aspect, the present application provides a battery device including a battery cell and a box body, the battery cell having a main body and a convex portion located on one side of the main body, the convex portion protruding along a first direction; the box body includes a first box body portion and a second box body portion that are interlocked and enclosed to form a accommodating cavity, a plurality of battery cells are arranged in the accommodating cavity, the first box body portion is at least partially located on the side of the convex portion away from the main body portion in the first direction, the first box body portion is provided with a recess, along the first direction, the orthographic projection of the recess covers the orthographic projection of the convex portion, and the convex portion at least partially extends into the recess.

[0006] In the technical solution of the embodiment of the present application, the battery device includes a box body and a battery cell disposed in the box body, and the battery box body includes a first box body part and a second box body part that are interlocked, wherein the first box body part is disposed on the side of the battery cell having a convex part, and the first box body part has a concave part that matches the convex part and is used to accommodate the convex part. By matching the concave-convex structure of the first box body part with the battery cell, the space size required for the battery device as a whole in the first direction can be reduced, and at the same time, the shapes of the two can be matched to improve the structural strength and reduce the possibility of deformation.

[0007] According to some embodiments of the present application, multiple battery cells are arranged in an array along the second direction and the third direction in the accommodating cavity, and the first direction, the second direction and the third direction are arranged in pairs; the first box body includes multiple recesses, and the multiple recesses extend along the second direction and are arranged along the third direction, or the multiple recesses extend along the third direction and are arranged along the second direction, or the multiple recesses are arranged in an array along the second direction and the third direction. The multiple battery cells are divided and matched with the multiple recesses respectively to reduce the possibility of mutual interference between the battery cells and make the first box body easier to process.

[0008] In some embodiments according to the embodiments of the present application, a plurality of concave portions are arranged in an array along a second direction and a third direction, and the concave portions and the convex portions are arranged in one-to-one correspondence, providing an auxiliary limiting function for the battery cell.

[0009] In some embodiments according to the embodiments of the present application, the size of the convex portion in the second direction is greater than the size in the third direction; a plurality of concave portions extend along the second direction and are arranged at intervals along the third direction, or a plurality of concave portions are arranged in an array. A barrier is formed between the relatively large side surfaces of at least some adjacent convex portions, reducing the possibility of mutual interference.

[0010] In some embodiments according to the embodiments of the present application, the battery device further includes a heat insulation member, and the heat insulation member is disposed in the concave portion and sandwiched between the convex portion and the concave portion, blocking heat and reducing damage to other battery cells in the case of thermal runaway.

[0011] In some embodiments according to the embodiments of the present application, one side of the convex portion facing away from the main body portion has a top surface, and along the first direction, at least a part of the heat insulation member is disposed between the top surface and the bottom wall of the concave portion, reducing the damage to other battery cells and the box body caused by the high-temperature fluid ejected during thermal runaway.

[0012] In some embodiments according to the embodiments of the present application, the heat insulation member includes a phase change heat insulation material, further improving the heat absorption capacity of the heat insulation member.

[0013] In some embodiments according to the embodiments of the present application, a plurality of battery cells are arranged in an array along a second direction and a third direction in the accommodation cavity, and the size of the convex portion in the second direction is greater than the size in the third direction; at least a part of the heat insulation member is disposed between the opposite side surfaces of the convex portion in the third direction and the side walls of the concave portion, providing a heat insulation structure on the side with a relatively large area of the convex portion and further blocking heat conduction.

[0014] In some embodiments according to the embodiments of the present application, a thermal conductive adhesive layer is provided between the convex portion and the concave portion, and the convex portion and the first box body portion are adhesively connected through the thermal conductive adhesive layer, improving the thermal conduction efficiency while adhesively fixing and improving the heat dissipation performance.

[0015] In some embodiments according to the embodiments of the present application, the first box body portion is provided with a pressure relief hole and a pressure relief channel, the pressure relief hole extends along the first direction and communicates between the pressure relief channel and the concave portion, and along the first direction, the orthographic projection of the concave portion covers the orthographic projection of the pressure relief hole, guiding the high-temperature and high-pressure fluid ejected during the thermal runaway of the battery cell through the pressure relief hole and the pressure relief channel, reducing the damage to other battery cells.

[0016] According to some embodiments of the present application, the first box body part further includes a sealing member, which is disposed at the pressure relief hole and closes the pressure relief hole, and the sealing member is connected to the first box body part by bonding, clamping, pressing or welding. While providing a pressure relief channel, the possibility of external dust, rainwater, etc. entering the battery device is reduced.

[0017] In a second aspect, a power-consuming device is proposed according to an embodiment of the present application, including the battery device in any of the embodiments of the first aspect, and the battery device is used to provide electric energy. Description of the Drawings

[0018] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered as a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0019] Figure 1 A simple schematic diagram of a vehicle provided by some embodiments of the present application;

[0020] Figure 2 An exploded schematic diagram of a battery device provided by some embodiments of the present application;

[0021] Figure 3 An exploded schematic diagram of a battery cell provided by some embodiments of the present application;

[0022] Figure 4 A partial structural schematic diagram of a battery device provided by some embodiments of the present application;

[0023] Figure 5 A structural schematic diagram of the first box body part provided by some embodiments of the present application;

[0024] Figure 6 A structural schematic diagram of the first box body part provided by some other embodiments of the present application;

[0025] Figure 7 A partial structural schematic diagram of a battery device provided by some other embodiments of the present application;

[0026] Figure 8 A partial structural schematic diagram of a battery device provided by some other embodiments of the present application.

[0027] Reference Numerals:

[0028] 1000 - Vehicle;

[0029] 100 - Battery Device; 200 - Controller; 300 - Motor;

[0030] 10 - Battery Cell; 20 - Box Body; 30 - Heat Insulation Member;

[0031] 11 - Main body part; 12 - Convex part; 21 - First box part; 22 - Second box part; 23 - Accommodation cavity;

[0032] 121 - Top surface; 211 - Concave part;

[0033] X - First direction; Y - Second direction; Z - Third direction. Specific embodiments

[0034] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0035] 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 herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above accompanying drawings are intended to cover non-exclusive inclusion.

[0036] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is more than two, unless otherwise clearly and specifically defined.

[0037] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears 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 explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0038] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0039] In the description of the embodiments of this application, the term "a plurality" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of sheets" refers to more than two sheets (including two sheets).

[0040] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical 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. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of 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 should not be construed as a limitation to the embodiments of the present application.

[0041] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0042] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can activate the active material and continue to be used by charging after discharging.

[0043] The battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application do not limit this.

[0044] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) shuttle between the positive electrode and the negative electrode for insertion and extraction. The separator is disposed between the positive electrode and the negative electrode, which can prevent short circuit between the positive and negative electrodes and allow active ions to pass through at the same time.

[0045] In some embodiments, the positive electrode can be a positive electrode sheet, and the positive electrode sheet can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0046] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0047] As an example, the positive electrode current collector can be a metal foil or a composite current collector.

[0048] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0049] As an example, the negative electrode current collector can be a metal foil, a foam metal, or a composite current collector.

[0050] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0051] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0052] As an example, the negative electrode active material can be a negative electrode active material for a battery cell known in the art. As an example, the negative electrode active material can include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate.

[0053] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0054] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0055] In some embodiments, the separator is a separator membrane. The present application does not particularly limit the type of the separator membrane, and any known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0056] As an example, the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0057] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes at the same time.

[0058] In some embodiments, the battery cell further includes an electrolyte that serves to conduct ions between the positive and negative electrodes. The present application does not specifically limit the type of the electrolyte, and it can be selected according to requirements. The electrolyte can be liquid, gel-like, or solid.

[0059] In some embodiments, the electrode assembly is provided with tabs, and the tabs can lead the current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0060] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as an electrode assembly and an electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0061] In some embodiments, functional components such as electrode terminals may be provided on the housing. The electrode terminals can be used to electrically connect with the electrode assembly for outputting or inputting electrical energy of the battery cell.

[0062] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc. There is no particular limitation in this application.

[0063] The battery device mentioned in the embodiments of this application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0064] In some embodiments, the battery device can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0065] In some embodiments, the battery device can be a battery pack. The battery pack includes a box body and battery cells, and the battery cells or battery modules are accommodated in the box body.

[0066] In some embodiments, the box body can be part of the chassis structure of a vehicle. For example, part of the box body can become at least part of the floor of the vehicle, or part of the box body can become at least part of the crossbeam and longitudinal beam of the vehicle.

[0067] In some embodiments, the battery device can be an energy storage device. The energy storage device includes an energy storage container, an energy storage electrical cabinet, etc.

[0068] The battery device generally includes a box body and a plurality of battery cells disposed in the box body. Among them, the battery cells generally have electrode terminals protruding from the main body structure and convex parts corresponding to the pressure relief mechanism, etc.

[0069] On this basis, the applicant found that in order to accommodate this protruding structure, the battery device generally requires a relatively large size space in the protruding direction of the foregoing structure. And due to the gap between at least part of the non-protruding area of the box body and the battery cell, the box body is prone to problems such as being deformed by impact, and the structural strength and reliability are relatively low.

[0070] In view of this, the embodiments of this application provide a technical solution, which accommodates the foregoing protruding structure by providing a recess corresponding to the protruding structure on the inner side of the box body, and some can reduce the space required by the battery device and improve the reliability.

[0071] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical equipment using battery devices. The electrical equipment includes, for example, mobile phones, portable devices, laptop computers, battery cars, electric vehicles, ships, spacecrafts, electric toys, and electric tools, etc. Among them, the spacecraft includes, for example, airplanes, rockets, space shuttles, and spaceships, etc. The electric toys include, for example, fixed or mobile electric toys, specifically, game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc. The electric tools include, for example, metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, specifically, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact electric drills, concrete vibrators, and electric planers.

[0072] The battery cells described in the embodiments of the present application are not limited to the above-described electrical equipment. However, for the sake of simplicity of description, the following embodiments will be described by taking electric vehicles as an example.

[0073] Please refer to Figure 1 , Figure 1 which is a schematic diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 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. A battery device 100 can be disposed inside the vehicle 1000. Specifically, for example, the battery device 100 can be disposed at the bottom, the front end, or the rear end of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000. For example, the battery device 100 can be used as the operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300. The controller 200 is used to control, for example, the battery to supply power to the motor 300. The battery device 100 can be used for starting, navigation, etc. of the vehicle 1000. Of course, the battery can also be used to drive the vehicle 1000 to travel, replacing or partially replacing fuel or natural gas to provide drive for the vehicle 1000.

[0074] Figure 2 which is an exploded view of the battery device 100 provided by some embodiments of the present application. As Figure 2 shown, the battery device 100 includes a box body 20 and battery cells 10, and the battery cells 10 are accommodated in the box body 20.

[0075] The housing 20 is used to accommodate the battery cells 10, and the housing 20 can have various structures. In some embodiments, the housing 20 can include a first housing portion 21 and a second housing portion 22. The first housing portion 21 and the second housing portion 22 are covered with each other, and the first housing portion 21 and the second housing portion 22 jointly define a receiving cavity 23 for accommodating the battery cells 10. The second housing portion 22 can be a hollow structure with one end open, and the first housing portion 21 is a plate-like structure. The first housing portion 21 is covered on the open side of the second housing portion 22 to form the housing 20 with the receiving cavity 23; both the first housing portion 21 and the second housing portion 22 can also be hollow structures with one side open, and the open side of the first housing portion 21 is covered on the open side of the second housing portion 22 to form the housing 20 with the receiving cavity 23. Of course, the first housing portion 21 and the second housing portion 22 can have various shapes, such as a cylinder, a cuboid, etc.

[0076] In a battery, the battery cells 10 can be one or multiple. If there are multiple battery cells 10, the multiple battery cells 10 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 10. The multiple battery cells 10 can be directly connected in series, in parallel, or in a mixed connection together, and then the whole formed by the multiple battery cells 10 is accommodated in the housing 20; of course, it can also be that the multiple battery cells 10 are first connected in series, in parallel, or in a mixed connection to form battery modules, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole and are accommodated in the housing 20.

[0077] In some embodiments, there are multiple battery cells 10. The multiple battery cells 10 are first connected in series, in parallel, or in a mixed connection to form battery modules. The multiple battery modules are then connected in series, in parallel, or in a mixed connection to form a whole and are accommodated in the housing 20.

[0078] Next, in conjunction with the attached Figure 3 to the attached Figure 7 the structures of the battery cells 10, the battery device 100, and the electrical equipment will be described.

[0079] Please also refer to Figure 3 and Figure 4 , Figure 3 which is an exploded view of the battery cell 10 provided in some embodiments of the present application, Figure 4 and which is a partial structural view of the battery device 100 provided in some embodiments of the present application.

[0080] In the first aspect, the present application provides a battery device 100, including a battery cell 10 and a box body 20, the battery cell 10 has a main body 11 and a convex portion 12 located on one side of the main body 11, and the convex portion 12 is protruding along the first direction X; the box body 20 includes a first box body portion 21 and a second box body portion 22 that are interlocked and enclosed to form a accommodating cavity 23, and multiple battery cells 10 are arranged in the accommodating cavity 23, the first box body portion 21 is at least partially located on the side of the convex portion 12 away from the main body 11 in the first direction X, and the first box body portion 21 is provided with a recess 211, along the first direction X, the orthographic projection of the recess 211 covers the orthographic projection of the convex portion 12, and the convex portion 12 at least partially extends into the recess 211.

[0081] The embodiment of the present application provides a battery device 100, including a box body 20 and a plurality of battery cells 10 disposed in the box body 20. The box body 20 may optionally include a first box body portion 21 and a second box body portion 22, which are interlocked and enclosed to form a receiving cavity 23 for accommodating the battery cells 10 and components such as electrical connectors. The first box body portion 21 and the second box body portion 22 may be connected by welding or detachably connected by fasteners.

[0082] The battery cell 10 includes a main body 11 and a protrusion located on one side of the main body 11 in a first direction X and protruding from the main body 11 along the direction. Optionally, along the first direction X, the orthographic projection of the protrusion may overlap with the orthographic projection of the pressure relief mechanism of the battery cell 10, and further, the protrusion 12 may cover the pressure relief mechanism below. The main body 11 of the battery cell 10 may also be provided with an electrode terminal protruding from the main body 11. Exemplarily, the electrode terminal and the protrusion 12 may be provided on the same side of the main body 11 and located between two electrode terminals arranged at intervals.

[0083] In the box body 20, the first box body part 21 is at least partially arranged on the side of the convex part 12 away from the main body part 11, and the second box body part 22 is at least partially arranged on the side of the main body part 11 away from the convex part 12, and the two are interlocked. A plurality of recesses 211 may be arranged on the side of the first box body part 21 facing the battery cell 10, and the opening of the recess 211 is located on the side surface of the first box body part 21 facing the battery cell 10, and is recessed along the first direction X. Further, these recesses 211 are respectively arranged corresponding to the convex parts 12 of the plurality of battery cells 10, so that each convex part 12 at least partially extends into the recess 211.

[0084] Optionally, to enable the convex portion 12 to be embedded in the concave portion 211, along the first direction X, for each pair of correspondingly arranged concave portion 211 and convex portion 12, the orthographic projection area of the concave portion 211 may be larger than that of the convex portion 12, and at the same time, the orthographic projection of the concave portion 211 may cover the orthographic projection of the convex portion 12. The concave portion 211 may be configured to conform to the shape of the convex portion 12 to reduce the gap between the two.

[0085] It can be understood that in the embodiment where the convex portion 12 is arranged on the same side as the electrode terminal, to accommodate the electrode terminal and the bus bar at the terminal, etc., the first box body portion 21 may also be provided with a groove at the position corresponding to the electrode terminal to provide a receiving space along the first direction X. The depth of the groove corresponding to the electrode terminal and the depth of the concave portion 211 may be optionally set according to the protruding dimensions of the electrode terminal and the convex portion 12 respectively, and the present application does not make specific limitations thereto. The groove corresponding to the electrode terminal may be optionally arranged at intervals from the concave portion 211 to improve the adaptability between the first box body portion 21 and the battery cell 10.

[0086] In the technical solution of the embodiment of the present application, the battery device 100 includes a box body 20 and a battery cell 10 disposed in the box body 20. The battery box body 20 includes a first box body portion 21 and a second box body portion 22 that are buckled with each other. The first box body portion 21 is disposed on the side of the battery cell 10 having the convex portion 12, and the first box body portion 21 has a concave portion 211 that cooperates with the convex portion 12 for accommodating the convex portion 12. By matching the concave-convex structure of the first box body portion 21 with the battery cell 10, the overall space size required by the battery device 100 in the first direction X can be reduced. At the same time, the shapes of the two can be made to fit together to improve the structural strength and reduce the possibility of deformation.

[0087] Please refer to Figure 5 and Figure 6 , Figure 5 which is a schematic structural diagram of the first box body portion 21 provided by some embodiments of the present application, Figure 6 which is a schematic structural diagram of the first box body portion 21 provided by other embodiments of the present application.

[0088] In some alternative embodiments, a plurality of battery cells 10 are arranged in an array along the second direction Y and the third direction Z in the accommodation cavity 23, and the first direction X, the second direction Y, and the third direction Z are pairwise intersecting; the first box body 20 includes a plurality of concave portions 211, and the plurality of concave portions 211 extend along the second direction Y and are arranged along the third direction Z, or the plurality of concave portions 211 extend along the third direction Z and are arranged along the second direction Y, or the plurality of concave portions 211 are arranged in an array along the second direction Y and the third direction Z.

[0089] In the battery device 100 according to the embodiment of the present application, it includes a box body 20 and battery cells 10. Among them, a concave portion 211 matching with the convex portion 12 of the battery elevator is provided on the first box body portion 21 of the box body 20. When multiple battery cells 10 are provided, each battery cell 10 can be arranged in an array along the second direction Y and the third direction Z to reduce the gap size between the battery cells 10 and improve the overall energy density of the battery device 100. Among them, the first direction X, the second direction Y, and the third direction Z intersect pairwise, and further can be optionally pairwise perpendicular. It can be understood that the arrangement in an array along the second direction Y and the third direction Z means that one of the second direction Y and the third direction Z is the row direction, and the other is the column direction.

[0090] On this basis, the concave portion 211 can adopt a variety of different arrangement methods. For example, it can be optionally continuously extended along one of the second direction Y and the third direction Z, and arranged in sequence along the other. Taking the concave portion 211 extending along the second direction Y and arranged at intervals along the third direction Z as an example, the extension dimension of the concave portion 211 in the second direction Y can be the same as or close to the maximum dimension occupied by the multiple battery cells 10 in this direction, so that it can be correspondingly arranged with the convex portions 12 of the multiple battery cells 10 in the same row / same column at the same time. The width dimension of the concave portion 211 in the third direction Z can be optionally slightly larger than the dimension of the convex portion 12 in this direction, so that the two can cooperate with each other and the convex portion 12 is at least partially received in the concave portion 211.

[0091] Alternatively, multiple concave portions 211 can also be arranged in an array similar to the convex portion 12, and also arranged in an array along the second direction Y and the third direction Z. In this embodiment, each concave portion 211 can be optionally arranged corresponding to multiple convex portions 12, or the concave portion 211 can be optionally arranged in one-to-one correspondence with the convex portion 12. Exemplarily, each concave portion 211 can be arranged corresponding to four convex portions 12. The four convex portions 12 corresponding to the same concave portion 211 can be optionally arranged in an array of two rows and two columns, so as to facilitate the adjustment of the shape structure of the concave portion 211.

[0092] By separating the convex portions 12 of multiple battery cells 10 from each other and making them cooperate with multiple concave portions 211 respectively, the possibility of mutual interference between the battery cells 10 can be reduced through the barrier between different concave portions 211, and the first box body portion 21 is convenient for processing.

[0093] In some alternative embodiments, multiple concave portions 211 are arranged in an array along the second direction Y and the third direction Z, and the concave portion 211 is arranged in one-to-one correspondence with the convex portion 12.

[0094] Optionally, in an embodiment where the concave portions 211 are arranged in a whole array, the concave portions 211 and the convex portions 12 can be further arranged in one-to-one correspondence. The positive projection of the convex portion 12 along the first direction X can have the same shape and similar dimensions as the positive projection of the concave portion 211, and optionally, the positive projections of the corresponding concave portion 211 and the convex portion 12 can be concentrically arranged to reduce the accuracy requirements for assembly.

[0095] By arranging the concave portions 211 in an array and corresponding them to the convex portions 12 one by one, an auxiliary limiting function can be provided for the battery cell 10 through the insertion fit between the concave portions 211 and the convex portions 12, that is, the relative positions between the first box body portion 21 and each battery cell 10 are auxiliary limited, thereby reducing the overall assembly difficulty of the battery device 100 and improving the processing efficiency and reliability.

[0096] In some alternative embodiments, the dimension of the convex portion 12 in the second direction Y is greater than the dimension in the third direction Z; the plurality of concave portions 211 extend along the second direction Y and are arranged at intervals along the third direction Z, or the plurality of concave portions 211 are arranged in an array.

[0097] Based on the arrangement of the plurality of battery cells 10 in an array along the second direction Y and the third direction Z, the shape of the positive projection of the convex portion 12 along the first direction X can be made to match the overall shape of the battery cell 10 and the shape of the components provided in the convex portion 12, for example, it can be optionally rectangular or runway-shaped, etc.

[0098] Furthermore, in an embodiment where the dimension of the convex portion 12 in the second direction Y is greater than its dimension in the third direction Z, the concave portion 211 can be correspondingly extended along the second direction Y and arranged at intervals along the third direction Z, or the concave portion 211 can be arranged in an array. Thus, the two surfaces of the side surface of the convex portion 12 with larger area and extending along the second direction Y can be arranged opposite to the concave portion 211, thereby forming a barrier between the side surfaces with larger area of adjacent convex portions 12.

[0099] By forming a barrier between at least some adjacent convex portions 12 on the side surfaces with larger area, the possibility of mutual interference between the battery cells 10 can be reduced.

[0100] Please refer to Figure 7 , Figure 7 which is a schematic diagram of a partial structure of the battery device 100 provided in some other embodiments of the present application. In some alternative embodiments, the battery device 100 further includes a heat insulation member 30, and the heat insulation member 30 is at least partially disposed in the concave portion 211 and clamped between the convex portion 12 and the concave portion 211.

[0101] Optionally, the battery device 100 may further include a heat insulation member 30 for providing a function of blocking heat on the side where the convex portion 12 of the battery cell 10 is located. Specifically, the heat insulation member 30 may be selected to have a relatively large area and be disposed to completely cover the tops of a plurality of battery cells 10, or the heat insulation member 30 may be selected to include multiple pieces respectively corresponding to the plurality of convex portions 12.

[0102] The heat insulation member 30 may optionally be made of a material such as foam with good heat insulation ability, light weight, and certain elastic deformation ability, so as to provide buffering, vibration damping, and protection functions while providing a certain heat insulation effect, that is, using the heat insulation member 30 as a buffer pad at the same time.

[0103] The heat insulation member 30 in the battery device 100 is at least partially clamped between the convex portion 12 and the concave portion 211. Specifically, the heat insulation member 30 may be selected to be disposed only between the top surface 121 of the convex portion 12 and the bottom wall of the concave portion 211, or heat insulation members 30 may be provided on the top surface 121 and each side surface of the convex portion 12.

[0104] In an embodiment where the heat insulation member 30 is provided, the concave portion 211 and the convex portion 12 may be selected to be arranged in one-to-one correspondence, and heat insulation members 30 are provided on the top surface 121 and the side surfaces of the convex portion 12. Thus, on the basis of defining the relative position between the battery cell 10 and the first box body portion 21 through the cooperation of the concave portion 211 and the convex portion 12, heat insulation and buffer vibration damping effects in all directions can be provided at the mating portion, further improving the reliability of the battery device 100 on the basis of improving the alignment accuracy and relative position stability, and reducing vibration noise.

[0105] As described above, the pressure relief mechanism of the battery cell 10 is usually arranged at the convex portion 12. Thus, by arranging the heat insulation member 30 between the convex portion 12 and the concave portion 211, heat can be blocked and absorbed. Once a certain battery cell 10 or some battery cells 10 in the battery device 100 experience thermal runaway, the pressure relief structure can release pressure directly against the heat insulation member 30, thereby being able to reduce the damage to other battery cells 10 and reduce the possibility of the overall fire and explosion of the battery device 100.

[0106] In some alternative embodiments, one side of the convex portion 12 facing away from the main body portion 11 has a top surface 121, and along the first direction X, the heat insulation member 30 is at least partially disposed between the top surface 121 and the bottom wall of the concave portion 211.

[0107] In the embodiment where the heat insulating member 30 is provided, at least part of the heat insulating member 30 may be provided between the top surface 121 of the convex portion 12 and the bottom wall of the concave portion 211. Specifically, the convex portion 12 is provided protruding from the main body 11 of the battery cell 10 along the first direction X. To save space, its extension dimension in the first direction X is usually small. At the same time, to cover components such as the pressure relief mechanism, its orthographic projection along the first direction X usually has a certain area dimension, that is, its top surface 121 on the side away from the main body 11 usually has a certain area.

[0108] On this basis, the wall portion of the concave portion 211 opposite to the top surface 121 and intersecting with the first direction X is recorded as the bottom wall, and the wall portion opposite to the side of the convex portion 12 is recorded as the side wall, and the heat insulating member 30 can be at least partially arranged between the top surface 121 and the bottom wall of the concave portion 211, so that the heat insulating member 30 has a larger area, and can be arranged on the pressure relief path of the battery cell 10 in the case of thermal runaway to provide a good heat insulation effect. By setting the heat insulating member 30, the damage to other battery cells 10 and the box body 20 caused by the high-temperature fluid ejected during thermal runaway can be reduced.

[0109] In some optional embodiments, the thermal insulation 30 includes a phase change thermal insulation material.

[0110] Optionally, the thermal insulation 30 may be at least partially made of a phase change thermal insulation material, wherein the phase change thermal insulation material refers to a material that can undergo a physical phase change when the temperature or pressure changes, thereby absorbing or releasing a large amount of heat. During the phase change process, the temperature of such a material can remain constant or have a small temperature change amplitude, accompanied by the absorption or release of latent heat, and this process is called phase change. By setting the thermal insulation 30 as a phase change thermal insulation pad, its heat absorption effect can be improved, and the thermal insulation performance can be further improved.

[0111] See also Figure 8 , Figure 8 Schematic diagram of the partial structure of a battery device provided in some other embodiments of the present application.

[0112] In some optional embodiments, a plurality of battery cells 10 are arranged in an array along a second direction Y and a third direction Z in a housing cavity 23, and a dimension of the protrusion 12 in the second direction Y is greater than a dimension in the third direction Z; the thermal insulation member 30 is at least partially disposed between the two opposite side surfaces of the protrusion 12 in the third direction Z and the side walls of the recess 211.

[0113] Optionally, in order to evenly distribute the battery cells 10, the multiple battery cells 10 in the battery device 100 can be arranged in an array along the second direction Y and the third direction Z, and in accordance with the structural dimensions of the battery cells 10, the extension dimension of the protrusion 12 in the second direction Y can be greater than the extension dimension in the third direction Z.

[0114] On this basis, taking the case where the positive projection of the convex portion 12 along the first direction X is rectangular as an example, its long side can extend along the second direction Y, and its short side extends along the third direction Z. Correspondingly, when the dimensions of the convex portion 12 along the first direction X are the same or similar at various locations, the area dimensions of its respective side surfaces are proportional to the aforementioned side lengths.

[0115] Furthermore, heat insulation members 30 can be provided between the two surfaces of the convex portion 12 opposite to each other along the third direction Z and the side walls of the concave portion 211, that is, the heat insulation members 30 are at least partially located between the two side surfaces of the convex portion 12 with larger areas and the side walls of the concave portion 211. The portion of the heat insulation member 30 located between the aforementioned side surface and the side wall of the concave portion 211 can be selected to have an area dimension the same as or similar to that of the side wall. Providing a heat insulation structure on the side of the convex portion 12 with a larger area can further improve the effect of blocking heat conduction.

[0116] In some alternative embodiments, a thermal conductive adhesive layer is provided between the convex portion 12 and the concave portion 211, and the convex portion 12 and the first box body portion 21 are adhesively connected through the thermal conductive adhesive layer.

[0117] Optionally, the battery cell 10 and the first box body portion 21 can be connected by an adhesive method. A thermal conductive adhesive layer can be provided on the side of the battery cell 10 close to the convex portion 12. The thermal conductive adhesive layer can be evenly distributed and completely cover each battery cell 10, or the thermal conductive adhesive layer can include a plurality of sub-adhesive layers distributed at intervals, and each sub-adhesive layer can be selected to be distributed in an equally spaced array.

[0118] The convex portions 12 of each battery cell 10 and the concave portions 211 of the first box body portion 21 can be adhesively connected through the aforementioned thermal conductive adhesive layer. While forming a stable connection relationship, it can improve the heat conduction efficiency between the convex portion 12 and the concave portion 211, that is, between the battery cell 10 and the first box body portion 21, thereby improving the heat dissipation effect of each battery cell 10 and enhancing the overall heat dissipation performance of the battery device 100.

[0119] In some alternative embodiments, the first box body portion 21 is provided with a pressure relief hole and a pressure relief channel. The pressure relief hole extends along the first direction X and is communicated between the pressure relief channel and the concave portion 211. Along the first direction X, the positive projection of the concave portion 211 covers the positive projection of the pressure relief hole.

[0120] The first box body portion 21 in the embodiments of the present application can also be provided with an auxiliary pressure relief structure for guiding the ejected high-temperature and high-pressure fluid outside the battery device 100 when the battery cell 10 experiences thermal runaway. Specifically, it can include a pressure relief hole and a pressure relief channel. The pressure relief hole is used to communicate with the concave portion 211, and the pressure relief channel is used to guide the fluid to a preset position.

[0121] Optionally, along the first direction X, the positive projection of the recess 211 covers the positive projection of the pressure relief hole. The pressure relief hole and the recess 211 are preferably arranged in a one-to-one correspondence. The cross-sectional interface of the pressure relief hole is smaller than the cross-sectional area of the recess 211. The cross-sectional shape of the pressure relief hole can be circular, elliptical, rectangular, triangular, racetrack-shaped, etc., and the present application does not make specific limitations thereto. In an embodiment where a pressure relief structure is provided at the convex portion 12, along the first direction X, the pressure relief hole and the pressure relief structure can be arranged to face each other.

[0122] The pressure relief channel can be arranged in the first box body portion 21 to form a tubular channel that is only connected to the outside at both ends. Alternatively, the pressure relief channel can be arranged on the surface of the first box body portion 21 facing away from the second box body portion 22 to form a semi-open trough-shaped channel. In an embodiment where a plurality of battery cells 10 are arranged in an array along the second direction Y and the third direction Z, the pressure relief channel can be preferably extended along the second direction Y or the third direction Z, and its quantity can correspond to the number of rows of the battery cells 10 arranged in the other direction.

[0123] Exemplarily, a plurality of pressure relief channels can be extended along the second direction Y and arranged at intervals along the third direction Z. The plurality of pressure relief holes corresponding to the plurality of recesses 211 arranged in the same straight line along the second direction Y can be respectively connected to the same pressure relief channel, and the opposite ends of the pressure relief channel along the second direction Y can extend to the outer surface of the first box body portion 21 to discharge the fluid therein to the external environment or to other collection containers.

[0124] By providing the pressure relief hole and the pressure relief channel, the flow direction of the high-temperature and high-pressure fluid ejected during the thermal runaway of the battery cell 10 can be guided, reducing the damage to other battery cells 10.

[0125] In some alternative embodiments, the first box body portion 21 further includes a seal, which is arranged at the pressure relief hole to close the pressure relief hole. The seal is adhesively connected, snap-connected, press-connected or welded to the first box body portion 21.

[0126] In the embodiment provided with the aforementioned pressure relief hole and pressure relief channel, the first box body portion 21 can further include a seal, which can be arranged corresponding to the pressure relief hole and is used to close the pressure relief hole. The seal can be preferably made of an elastic sealing material such as rubber, or the seal can be preferably made of a material such as metal that is convenient for welding connection.

[0127] The seals may be arranged one-to-one with the pressure relief holes to form a ring with good sealing performance in the accommodating chamber 23. Specifically, in an embodiment where the seal is made of an elastic material such as rubber, the seal may be connected to the first box body 21 by crimping, clamping, bonding, etc.; in an embodiment where the seal is made of a material such as metal, the seal may be welded to the first box body 21 and a weak portion may be provided at the weld or other position. In this way, while the connection is stable, the seal can be ejected or broken when the corresponding battery cell 10 has thermal runaway, thereby allowing the fluid to enter the pressure relief channel and then flow to a preset position according to the flow direction of the pressure relief channel.

[0128] The sealing member can provide a channel for guiding the fluid and reduce the possibility of foreign matter such as dust and rain water entering the battery device 100 , thereby improving the reliability of the battery device 100 .

[0129] In a second aspect, according to an embodiment of the present application, an electrical device is proposed, comprising the battery device 100 in any embodiment of the first aspect, and the battery device 100 is used to provide electrical energy.

[0130] The electrical equipment in the embodiment of the present application has all the beneficial effects of the battery device 100 in the first aspect. For details, please refer to the specific description of the battery device 100 in the above embodiments, which will not be repeated in this embodiment.

[0131] The embodiment of the present application provides a battery device 100, including a battery cell 10 and a box body 20, wherein the battery cell 10 has a main body 11 and a convex portion 12 located on one side of the main body 11, and the convex portion 12 is arranged to protrude along a first direction X; the box body 20 includes a first box body portion 21 and a second box body portion 22 that are interlocked and enclosed to form a receiving cavity 23, and a plurality of battery cells 10 are arranged in the receiving cavity 23, and the first box body portion 21 is at least partially located on a side of the convex portion 12 away from the main body 11 in the first direction X, and the first box body portion 21 is provided with a concave portion 211, and along the first direction X, the orthographic projection of the concave portion 211 covers the orthographic projection of the convex portion 12, and the convex portion 12 at least partially extends into the concave portion 211.

[0132] The battery cells 10 and the recesses 211 are arranged in an array along the second direction Y and the third direction Z, and the protrusions 12 and the recesses 211 are arranged one by one. The battery device 100 further includes a heat insulator 30 disposed in the recesses 211 and sandwiched between the protrusions 12 and the recesses 211 .

[0133] Finally, it should be noted that the above 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 described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered by the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: A battery cell having a main body and a convex portion located on one side of the main body, wherein the convex portion is protruding along a first direction; The box body includes a first box body part and a second box body part which are interlocked and enclosed to form a accommodating cavity, and a plurality of battery cells are arranged in the accommodating cavity. The first box body part is at least partially located on the side of the convex part away from the main body part in the first direction. The first box body part is provided with a concave part. Along the first direction, the orthographic projection of the concave part covers the orthographic projection of the convex part, and the convex part at least partially extends into the concave part.

2. The battery device according to claim 1, characterized in that: The plurality of battery cells are arranged in an array along a second direction and a third direction in the accommodation cavity, and the first direction, the second direction and the third direction are arranged to intersect each other; The first box body includes a plurality of the recesses, the plurality of the recesses extend along the second direction and are arranged along the third direction, or the plurality of the recesses extend along the third direction and are arranged along the second direction, or the plurality of the recesses are arranged in an array along the second direction and the third direction.

3. The battery device according to claim 2, characterized in that: The plurality of concave portions are arranged in an array along the second direction and the third direction, and the concave portions are arranged in a one-to-one correspondence with the convex portions.

4. The battery device according to claim 2, characterized in that: The dimension of the convex portion in the second direction is greater than the dimension in the third direction; The plurality of recesses extend along the second direction and are arranged at intervals along the third direction, or the plurality of recesses are arranged in an array.

5. The battery device according to claim 1, characterized in that: The battery device further includes a heat insulating member, wherein the heat insulating member is at least partially disposed in the recess and sandwiched between the protrusion and the recess.

6. The battery device according to claim 5, characterized in that: The convex portion has a top surface on a side facing away from the main body portion, and along the first direction, the heat insulating member is at least partially disposed between the top surface and the bottom wall of the concave portion.

7. The battery device according to claim 6, characterized in that: The thermal insulation element includes a phase change thermal insulation material.

8. The battery device according to claim 5, characterized in that: The plurality of battery cells are arranged in an array along the second direction and the third direction in the accommodation cavity, and the size of the convex portion in the second direction is larger than the size in the third direction; The heat insulating member is at least partially disposed between two side surfaces of the convex portion that are opposite to each other in the third direction and the side wall of the concave portion.

9. The battery device according to claim 1, characterized in that: A heat-conducting adhesive layer is provided between the convex portion and the concave portion, and the convex portion and the first box portion are bonded and connected via the heat-conducting adhesive layer.

10. The battery device according to claim 1, characterized in that: The first box body is provided with a pressure relief hole and a pressure relief channel. The pressure relief hole is extended along the first direction and connected between the pressure relief channel and the recess. Along the first direction, the orthographic projection of the recess covers the orthographic projection of the pressure relief hole.

11. The battery device according to claim 10, characterized in that: The first box body also includes a sealing member, which is disposed on the pressure relief hole and seals the pressure relief hole. The sealing member is connected to the first box body by bonding, clamping, crimping or welding.

12. An electrical equipment, characterized in that: The invention comprises a battery device as claimed in any one of claims 1 to 11, wherein the battery device is used to provide electrical energy.

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