Battery and electric device

Abstract

The embodiment of the utility model provides a battery and a power utilization device, the battery comprises a box body and a battery monomer, and the box body comprises a box body and an expansion beam; the box body is provided with a containing cavity, the expansion beam is arranged in the containing cavity, the expansion beam comprises a body part and a reinforcing part, the reinforcing part is arranged on the surface of the body part, the body part comprises unidirectional fibers and a first adhesive, the reinforcing part comprises a multi-axial fabric and a second adhesive, and the extending direction of the fibers in the multi-axial fabric intersects with the extending direction of the unidirectional fibers; and the battery monomers are accommodated in the accommodating cavities and are positioned on one side of the expansion beam. According to the battery provided by the invention, the structural strength and the mechanical property of the expansion beam are improved, so that the reliability of the battery is improved.

Description

Technical Field

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

[0002] Batteries are widely used in electronic devices, such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes and power tools, etc.

[0003] In the development of battery technology, in addition to improving the performance of batteries, the reliability of batteries is also an issue that needs to be considered. Therefore, how to improve the reliability of batteries is an issue of continuous improvement in battery technology. Utility Model Content

[0004] The present application provides a battery and an electrical device to improve the reliability of the battery.

[0005] This application is achieved through the following technical solutions:

[0006] In the first aspect, the battery provided by the embodiment of the present application includes a box body and a battery cell, the box body includes a box body and an expansion beam; the box body has a accommodating cavity, the expansion beam is arranged in the accommodating cavity, the expansion beam includes a main body part and a reinforcement part, the reinforcement part is arranged on the surface of the main body part, the main body part includes a unidirectional fiber first adhesive, the reinforcement part includes a multi-axial fabric and a second adhesive, the extension direction of the fibers in the multi-axial fabric intersects with the extension direction of the unidirectional fibers; the battery cell is accommodated in the accommodating cavity and is arranged on one side of the expansion amount.

[0007] According to the battery provided in the embodiment of the present application, an expansion beam is provided, including a main body portion and a reinforcement portion, and the main body portion includes unidirectional fibers, the reinforcement portion includes a multi-axial fabric, and the extension direction of the fibers in the multi-axial fabric is arranged to intersect with the extension direction of the unidirectional fibers. The expansion beam formed in this way has high structural strength, especially in the direction perpendicular to the multi-axial fabric and the unidirectional fibers, which is beneficial to improving the structural strength and mechanical properties of the expansion beam. During the expansion and deformation of the battery cell, a large extrusion pressure is generated on the expansion beam. Since the expansion beam has a high structural strength, it can withstand the large expansion force of the battery cell, which is beneficial to improving the reliability performance of the battery.

[0008] According to some embodiments of the present application, the multi-axial fabric includes a tri-axial fabric, in which the fibers in the tri-axial fabric have three extending directions, and the extending direction of the fibers in the tri-axial fabric intersects with the extending direction of the unidirectional fibers.

[0009] In the above solution, the reinforced part and the main body have better structural strength after molding, especially in the direction perpendicular to the unidirectional fiber and the triaxial fabric, which is further beneficial to improve the structural strength of the expansion beam.

[0010] According to some embodiments of the present application, along the counterclockwise direction, the angles of the extension direction of the unidirectional fibers to the extension direction of the fibers in the triaxial fabric are α, β and γ, respectively, 30°≤α≤45°, 80°≤β≤100°, and 135°≤γ≤150°.

[0011] In the above scheme, the expansion beam has stronger structural strength, especially in the direction perpendicular to the unidirectional fibers and the triaxial fabric, and has stronger mechanical properties, which is beneficial to further improve the structural strength of the expansion beam.

[0012] According to some embodiments of the present application, the reinforcement portion includes a plurality of stacked multi-axial fabrics.

[0013] In the above scheme, it is beneficial to further improve the structural strength of the expansion beam, especially in the direction perpendicular to the unidirectional fragrant fiber and the multi-axial fabric, it has a stronger structural strength.

[0014] According to some embodiments of the present application, the relationship between the thickness d1 of the reinforcement portion and the thickness d of the wall portion of the corresponding expansion beam satisfies: 3 / 40≤d1 / d≤9 / 20.

[0015] In the above scheme, setting 3 / 40≤d1 / d≤9 / 20 is beneficial to further improve the structural strength of the expansion beam.

[0016] According to some embodiments of the present application, a thickness d of the wall portion of the expansion beam satisfies: 2 mm ≤ d ≤ 4 mm.

[0017] In the above scheme, setting 2mm≤d≤4mm is beneficial to improving the structural strength of the expansion beam while also helping to achieve lightweight expansion beams, thereby helping to reduce the weight of the box.

[0018] According to some embodiments of the present application, the expansion beam has a cavity, and the reinforcement portion is disposed on a side of the main body portion facing the cavity, which is beneficial to improving the structural strength of the expansion beam.

[0019] According to some embodiments of the present application, the reinforcement portion is disposed on a side of the main body portion facing away from the cavity.

[0020] In the above solution, when the expansion beam is subjected to an extrusion force, the main body and the reinforcement part bear the external extrusion force as a whole, which is beneficial to improving the structural strength of the expansion beam.

[0021] According to some embodiments of the present application, the expansion beam has a plurality of cavities, the plurality of cavities are independent of each other, and a reinforcement portion is provided on a side of the main body facing any cavity.

[0022] In the above solution, a reinforcement portion is provided on one side of the main body facing any cavity, which is beneficial to further improve the structural strength of the expansion beam.

[0023] According to some embodiments of the present application, the expansion beam includes a buffer portion and a bearing portion, the bearing portion is arranged on a side of the buffer portion facing away from the battery cell. The battery also includes an electrical component, the electrical component is arranged on the bearing portion.

[0024] In the above scheme, the deformation of the buffer part can be used to buffer the expansion deformation of the battery cell, and the bearing part can be used to bear the electrical components, and the buffer part can be used to buffer the impact force borne by the electrical components, which is beneficial to reduce the damage of external force majeure to the electrical components and further improve the reliability of the battery.

[0025] According to some embodiments of the present application, the box body includes a frame, the frame includes a first beam and a second beam, the second beam includes rolled steel, and at least one end of the first beam is riveted or welded to the second beam.

[0026] In the above scheme, setting the second beam to include rolled steel is conducive to simplifying the forming process of the second beam, and the second beam can be connected to the first beam by welding or riveting, which is conducive to simplifying the connection process of the first beam and the second beam, and further conducive to reducing the process difficulty in the box preparation process.

[0027] According to some embodiments of the present application, the box body also includes an inner liner, which is supported by the frame and has a receiving cavity. The expansion beam is disposed in the receiving cavity and supported by the inner liner.

[0028] In the above scheme, the inner liner can be used to provide a certain thermal insulation performance for the battery cell, reduce the risk of excessive temperature fluctuation of the battery cell, and help improve the temperature stability of the battery cell, thereby helping to improve the stability of battery performance.

[0029] According to some embodiments of the present application, the liner includes an liner body, and the liner body is made of a composite material.

[0030] In the above scheme, the thermal insulation performance of the inner liner is better, and the inner liner has better air tightness and better isolation from the external environment, which is conducive to further improving the thermal insulation performance of the inner liner for the battery cell, thereby improving the reliability of the battery.

[0031] According to some embodiments of the present application, the liner further includes a heat conducting member, which is disposed inside the liner body.

[0032] In the above scheme, a heat conducting member is arranged inside the inner liner body, which can improve the heat exchange efficiency between the battery cell and the inner liner. When the temperature of the battery cell is high, it is beneficial to dissipate the heat of the battery cell in time, which is beneficial to improve the reliability of the battery.

[0033] According to some embodiments of the present application, the inner tank includes a bottom wall, the bottom wall includes a bottom wall body and a convex portion, the convex portion is protruding relative to the bottom wall body on one side toward the accommodating cavity, a recess is formed on the side of the bottom wall away from the accommodating cavity at a position corresponding to the convex portion, and at least a portion of the first beam is accommodated in the recess.

[0034] In the above solution, it is helpful to increase the matching area between the first beam and the inner liner, and further help to increase the connection strength between the inner liner and the first beam.

[0035] According to some embodiments of the present application, the expansion beam has a plurality of cavities, including a buffer cavity and an avoidance cavity, the avoidance cavity has an opening on the side facing the bottom wall, and at least a portion of the protrusion is disposed in the avoidance cavity via the opening.

[0036] In the above scheme, the expansion beam cooperates with the convex part of the expansion beam by avoiding the cavity, which is beneficial to increase the matching area between the expansion beam and the inner liner, thereby improving the connection strength between the expansion beam and the inner liner.

[0037] According to some embodiments of the present application, the inner liner and the second beam are adhered to each other and bonded together.

[0038] In the above scheme, the inner liner and the second beam are arranged to be bonded to each other, which is beneficial to increase the matching area between the two, so that the inner liner and the surface of the second beam are fully connected to absorb the dimensional error of the inner liner and the second beam during the assembly process, which is beneficial to reduce the process difficulty during the box assembly process.

[0039] According to some embodiments of the present application, the box body further includes a connecting member, which connects the second beam, the inner container and the first beam.

[0040] In the above scheme, by providing the connecting piece, it is helpful to improve the connection strength between the inner liner and the first beam and the second beam respectively, and it is also beneficial to the connection process between the inner liner and the frame.

[0041] In a second aspect, the electrical device provided in the embodiments of the present application includes the battery provided in any of the above embodiments.

[0042] The electric device provided in the embodiment of the present application has the same technical effect as the battery provided in any of the above embodiments, and thus will not be described in detail here.

[0043] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application;

[0046] Figure 2 A schematic diagram of an exploded structure of a battery provided in an embodiment of the present application with some structures omitted;

[0047] Figure 3 A schematic diagram of the structure of a battery pack in a battery provided in an embodiment of the present application;

[0048] Figure 4 A schematic diagram of the explosion structure of a battery cell in a battery provided in an embodiment of the present application;

[0049] Figure 5 A schematic diagram of the exploded structure of a battery box provided in an embodiment of the present application;

[0050] Figure 6 A schematic cross-sectional view of an expansion beam in a battery box provided in an embodiment of the present application;

[0051] Figure 7 A schematic cross-sectional view of another expansion beam in a battery box provided in an embodiment of the present application;

[0052] Figure 8 A schematic diagram of the structure of the frame in the box of the battery provided in the embodiment of the present application;

[0053] Fig. 9 A schematic cross-sectional view of an inner liner in a battery box provided in an embodiment of the present application;

[0054] Fig.10 for Fig. 9 A partial enlarged view of point C in the middle;

[0055] Fig.11 A top view of a battery box provided in an embodiment of the present application;

[0056] Fig.12 for Fig.11 Schematic diagram of the cross-sectional structure along AA;

[0057] Fig.13 for Fig.12 A partial enlarged view of point B in the middle.

[0058] In the drawings, the figures are not necessarily drawn to scale.

[0059] Description of reference numerals:

[0060] 1-Vehicle; 1a-Motor; 1b-Controller;

[0061] 10-battery; 11-box; 11a-accommodation cavity; 111-first sub-box; 112-second sub-box;

[0062] 12-box body; 121-frame; 1211-first beam; 1212-second beam; 122-liner; 1221-liner body; 1222-heat conducting member; 122a-bottom wall; 122b-convex portion; 122c-concave portion;

[0063] 13-expansion beam; 13a-buffer portion; 13b-bearing portion; 131-body portion; 132-reinforcement portion; 133-cavity; 133a-buffer cavity; 133b-avoidance cavity; 133c-opening;

[0064] 14-Connector;

[0065] 20-battery module;

[0066] 30 - battery cell; 31 - housing; 311 - shell; 312 - end cover; 32 - electrode assembly. DETAILED DESCRIPTION

[0067] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0068] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; 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; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0069] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0070] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0071] The term "and / or" in this application 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 represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0072] The term "multiple" as used in the present application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0073] In some embodiments, the battery may be a battery pack. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery pack.

[0074] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery packs are accommodated in the case.

[0075] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the first beam and the second beam of the vehicle.

[0076] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0077] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0078] The battery cells may be, but are not limited to, lithium ion batteries, sodium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel hydrogen batteries, nickel cadmium batteries, lead storage batteries, etc.

[0079] A 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) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0080] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0081] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0082] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium with surface silver plating can be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0083] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0084] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0085] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used.

[0086] In some embodiments, the negative electrode current collector has two surfaces opposite to each other in its 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.

[0087] As an example, the negative electrode active material may adopt the negative electrode active material for the battery known in the art. As an example, the negative electrode active material may 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, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0088] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0089] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes.

[0090] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0091] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0092] In some embodiments, the electrode assembly is a laminate structure.

[0093] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0094] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap closes the opening to form a closed space for accommodating substances such as the electrode assembly and the electrolyte. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0095] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the electrode tab of the electrode assembly. The electrode terminal may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab through an adapter. The electrode terminal may be disposed on the end cap, or may be disposed on the housing.

[0096] In some embodiments, an explosion-proof valve is provided on the housing, and the explosion-proof valve is used to release the internal pressure of the battery cell.

[0097] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack 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 polygonal prismatic battery, such as a hexagonal prismatic battery, etc. There is no particular limitation in the embodiments of the present application.

[0098] When the battery is working, the battery cells are charged or discharged cyclically. During the process of charging and discharging the battery cells cyclically, the battery cells will expand or recover their deformation. Usually, the expansion beams in the box are used to offset the battery cells, so as to buffer the expansion force of the battery cells on the expansion beams through the contraction or recovery of the expansion beams.

[0099] In the related art, the expansion beam is made of a single material, and its mechanical properties such as anti-extrusion are poor. In particular, the structural strength in the direction perpendicular to the surface of the expansion beam is low. Therefore, under the action of the expansion force generated by the battery cell, the expansion beam is very easy to be damaged, seriously affecting the reliability of the box, and then affecting the reliability of the battery.

[0100] In view of this, an embodiment of the present application provides a battery, the battery includes a box body and a battery cell, the box body includes a box body and an expansion beam, the box body has a receiving cavity, the expansion beam is arranged in the receiving cavity, the expansion beam includes a main body and a reinforcement part, the reinforcement part is arranged on the surface of the main body, the main body includes unidirectional fibers and a first adhesive, the reinforcement part includes a multi-axial fabric and a second adhesive, and the extension direction of the fibers in the multi-axial fabric intersects with the extension direction of the unidirectional fibers. The battery cell is accommodated in the receiving cavity and is located on one side of the expansion beam.

[0101] The battery provided in the embodiment of the present application is provided with an expansion beam including a main body portion and a reinforcement portion, and the main body portion includes unidirectional fibers, the reinforcement portion includes a multi-axial fabric, and the extension direction of the fibers in the multi-axial fabric is arranged to intersect with the extension direction of the unidirectional fibers. The expansion beam formed in this way has high structural strength, especially in a direction perpendicular to the multi-axial fabric and the unidirectional fibers, which is beneficial to improving the mechanical properties of the expansion beam. During the expansion and deformation of the battery cell, a large extrusion pressure is generated on the expansion beam. Since the expansion beam has a high structural strength, it can withstand the large expansion force of the battery cell, which is beneficial to improving the reliability performance of the battery.

[0102] The technical solution provided in the embodiments of the present application is applicable to batteries and electrical devices using batteries.

[0103] The battery disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships or aircraft. The battery disclosed in the present application can be used to form a power supply system of the electrical device.

[0104] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0105] For the convenience of description, the following embodiments are described by taking a vehicle 1 as an example of an electrical device in an embodiment of the present application.

[0106] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1 provided for some embodiments of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 10 is provided inside the vehicle 1, and the battery 10 may be provided at the bottom, the head or the tail of the vehicle 1. The battery 10 may be used to power the vehicle 1, for example, the battery 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the startup, navigation and operation of the vehicle 1.

[0107] The vehicle 1 may further include a controller 1b and a motor 1a, wherein the controller 1b is used to control the battery 10 to supply power to the motor 1a, for example, to meet the power requirements of starting, navigating, and driving the vehicle 1.

[0108] In some embodiments of the present application, the battery 10 can be used not only as an operating power source for the vehicle 1 , but also as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0109] Please refer to Figure 2 and Figure 3 , Figure 2 An exploded view of a battery 10 provided in some embodiments of the present application, Figure 3Schematic diagram of the structure of the battery module 20 in the battery 10 provided in an embodiment of the present application. The battery 10 includes a case 11 and a battery cell 30, and the battery cell 30 is accommodated in the case 11. Among them, the case 11 is used to provide a storage space for the battery cell 30, and the case 11 can adopt a variety of structures. In some embodiments, the case 11 may include a first sub-case 111 and a second sub-case 112, the first sub-case 111 and the second sub-case 112 cover each other, and the first sub-case 111 and the second sub-case 112 jointly define a storage space for accommodating the battery cell 30. The second sub-box 112 may be a hollow structure with one end open, and the first sub-box 111 may be a plate-like structure, and the first sub-box 111 covers the open side of the second sub-box 112, so that the first sub-box 111 and the second sub-box 112 jointly define a storage space; the first sub-box 111 and the second sub-box 112 may also be hollow structures both with one side open, and the open side of the first sub-box 111 covers the open side of the second sub-box 112.

[0110] In the battery 10, there may be multiple battery cells 30, and the multiple battery cells 30 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 30 are both connected in series and in parallel. The multiple battery cells 30 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 30 is accommodated in the box 11; of course, the battery 10 may also be a battery module 20 in the form of multiple battery cells 30 connected in series, in parallel, or in a mixed connection, and then the multiple battery modules 20 are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 11. The battery 10 may also include other structures, for example, the battery 10 may also include a busbar component for realizing electrical connection between the multiple battery cells 30.

[0111] The battery cell 30 may be a secondary battery or a primary battery; the battery cell 30 may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.

[0112] Please refer to Figure 4 , Figure 4 Exploded diagram of a battery cell 30 provided in some embodiments of the present application. Figure 3 As shown, the battery cell 30 includes a housing 31, an electrode assembly 32 and electrode terminals. The housing 31 includes a shell 311 and an end cap 312. The shell 311 has an opening, and the end cap 312 closes the opening to isolate the internal environment of the battery cell 30 from the external environment.

[0113] The shell 311 is a component used to cooperate with the end cap 312 to form the internal environment of the battery cell 30, wherein the formed internal environment can be used to accommodate the electrode assembly 32, the electrolyte and other components. The shell 311 and the end cap 312 can be independent components. The shell 311 can be of various shapes and sizes. Specifically, the shape of the shell 311 can be determined according to the specific shape and size of the electrode assembly 32. The material of the shell 311 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0114] The end cap 312 refers to a component that covers the opening of the shell 311 to isolate the internal environment of the battery cell 30 from the external environment. Without limitation, the shape of the end cap 312 can be adapted to the shape of the shell 311 to match the shell 311. Optionally, the end cap 312 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 312 is not easily deformed when squeezed and collided, so that the battery cell 30 can have a higher structural strength and reliability can also be improved. Functional components such as electrode terminals can be provided on the end cap 312. The electrode terminal can be used to electrically connect to the electrode assembly 32 for outputting or inputting electrical energy of the battery cell 30. The material of the end cap 312 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose special restrictions on this. In some embodiments, an insulating structure can also be provided on the inner side of the end cap 312, and the insulating structure can be used to isolate the electrical connection components in the shell 311 from the end cap 312 to reduce the risk of short circuit. Exemplarily, the insulating structure may be plastic, rubber, or the like.

[0115] The electrode assembly 32 is a component in the battery cell 30 where an electrochemical reaction occurs. One or more electrode assemblies 32 may be included in the housing 311. The electrode assembly 32 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet, and the separator is used to separate the positive electrode sheet and the negative electrode sheet to avoid short circuits between the positive electrode sheet and the negative electrode sheet to a certain extent. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the electrode body of the electrode assembly 32, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute the pole ear. The positive pole ear and the negative pole ear may be located together at one end of the electrode body or respectively at both ends of the electrode body. During the charge and discharge process of the battery cell 30, the positive electrode active material and the negative electrode active material react with the electrolyte, and the pole ears connect the electrode terminals to form a current loop.

[0116] First, as Figure 2 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, the embodiment of the present application provides a battery 10, the battery 10 includes a box body 11 and a battery cell 30, the box body 11 includes a box body 12 and an expansion beam 13, the box body 12 has a receiving cavity 11a, the expansion beam 13 is arranged in the receiving cavity 11a, the expansion beam 13 includes a main body 131 and a reinforcement part 132, the reinforcement part 132 is arranged on the surface of the main body 131, the main body 131 includes unidirectional fibers and a first adhesive, the reinforcement part 132 includes a multi-axial fabric and a second adhesive, and the extension direction of the fibers in the multi-axial fabric intersects with the extension direction of the unidirectional fibers. The battery cell 30 is accommodated in the receiving cavity 11a and is located on one side of the expansion beam 13.

[0117] During the cyclic operation of the battery cell 30, a certain expansion force will be generated. The expansion beam 13 can be deformed as the battery cell 30 that is offset against it generates expansion deformation, so that the expansion force of the battery cell 30 on the expansion beam 13 can be buffered by the deformation generated by the expansion beam 13. As the expansion deformation of the battery cell 30 is restored, the deformation generated by the expansion beam 13 is also restored.

[0118] Optionally, the box body 12 may be at least a part of the first sub-box body 111 , or the box body 12 may also be at least a part of the second sub-box body 112 .

[0119] The expansion beam 13 includes a main body portion 131 and a reinforcement portion 132, and the reinforcement portion 132 is arranged on the surface of the main body portion 131. Optionally, the expansion beam 13 may include a plurality of cavities 133, and the reinforcement portion 132 may be arranged on the outer surface of the main body portion 131, or the reinforcement portion 132 may be arranged on the inner surface of the main body portion 131 facing the cavity 133. Of course, the reinforcement portion 132 may also be arranged on both the outer surface and the inner surface of the main body portion 131.

[0120] Optionally, the reinforcement portion 132 may be provided on a portion of the outer surface or the inner surface of the expansion beam 13 , or the reinforcement portion 132 may cover the inner surface or the outer surface of the expansion beam 13 .

[0121] The main body 131 includes unidirectional fibers and a first adhesive. Optionally, the unidirectional fibers may be unidirectional yarns, and the first adhesive may be resin or polyester, etc. The first adhesive and the unidirectional fibers may be formed by a pultrusion process. Specifically, the unidirectional fibers are firstly impregnated with a first adhesive such as a resin, and then the unidirectional fibers and the first adhesive are integrally cured to form the main body 131.

[0122] The gram weight of the unidirectional fiber may be 2400 TEX, etc. The volume content of the unidirectional fiber in the main body 131 may be 60% to 80%. For example, the volume content of the unidirectional fiber in the main body 131 may be 65%.

[0123] The reinforcement part 132 includes a multi-axial fabric and a second adhesive. The multi-axial fibers can be woven from fibers with multiple different extension directions, i.e., different angles. Optionally, the extension directions of the fibers in the multi-axial fabric can be two, three or more. The second adhesive can be a resin or polyester, etc. The material of the second adhesive can be the same as that of the first adhesive, or the materials of the first adhesive and the second adhesive are different. The second adhesive and the multi-axial fabric can also be formed by a pultrusion process.

[0124] The weight of multiaxial fabrics can be 450g / m 2 The volume content of the multi-axial fabric in the reinforcement portion 132 may be 50% to 65%. For example, the volume content of the multi-axial fabric in the reinforcement portion 132 may be 56%.

[0125] The extension direction of the fibers in the multi-axial fabric intersects with the extension direction of the unidirectional fibers, and the fibers in each extension direction in the multi-axial fabric intersect with the extension direction of the unidirectional fibers. In other words, each fiber in the multi-axial fabric intersects with the unidirectional fibers, and the extension direction of the unidirectional fibers may be the same as the extension direction of the expansion beam 13. After the main body 131 and the reinforcement part 132 are respectively formed by the pultrusion process, since the extension direction of the unidirectional fibers intersects with the extension direction of the fibers in the multi-axial fabric, the formed expansion beam 13 has a higher structural strength, especially in the direction perpendicular to the unidirectional fibers and the multi-axial fabric.

[0126] The multi-axial fabric may be a multi-axial cloth, and the reinforcement 132 may include one, two, three or more layers of the multi-axial fabric.

[0127] The box body 11 provided in the embodiment of the present application is provided with an expansion beam 13 including a main body portion 131 and a reinforcement portion 132, and the main body portion 131 includes unidirectional fibers, the reinforcement portion 132 includes a multi-axial fabric, and the extension direction of the fibers in the multi-axial fabric is arranged to intersect with the extension direction of the unidirectional fibers. The expansion beam 13 formed in this way has high structural strength, especially in the direction perpendicular to the multi-axial fabric and the unidirectional fibers, which is beneficial to improving the structural strength and mechanical properties of the expansion beam 13. During the expansion and deformation of the battery cell 30, a large extrusion pressure is generated on the expansion beam 13. Since the expansion beam 13 has a high structural strength, it can withstand the large expansion force of the battery cell 30, which is beneficial to improving the reliability performance of the battery 10.

[0128] In some embodiments, the multi-axial fabric comprises a tri-axial fabric, in which fibers in the tri-axial fabric extend in three directions, and the extending direction of the fibers in the tri-axial fabric intersects with the extending direction of the unidirectional fibers.

[0129] The fibers in the triaxial fabric have three extension directions, and the limits of the three extension directions all intersect with the extension direction of the unidirectional fibers. In other words, the fibers in the triaxial fabric extend in three directions that intersect with each other. In this way, the reinforcing portion 132 and the main body portion 131 after molding have better structural strength, especially in the direction perpendicular to the unidirectional fibers and the triaxial fabric, which is further conducive to improving the structural strength of the expansion beam 13.

[0130] In some embodiments, along the counterclockwise direction, the angles of the extension direction of the unidirectional fiber to the extension direction of the fiber in the triaxial fabric are α, β and γ, respectively, 30°≤α≤45°, 80°≤β≤100°, and 135°≤γ≤150°.

[0131] In the counterclockwise direction, the angles α, β and γ between the extension direction of the unidirectional fiber and the extension direction of the fiber in the triaxial fabric are respectively. The unidirectional fiber can overlap or be parallel to the fiber in the triaxial fabric after rotating counterclockwise by angles of α, β and γ respectively.

[0132] Optionally, α may be 30°, 35°, 40° or 45°, etc., β may be 80°, 85°, 90°, 95° or 100°, etc., and γ may be 135°, 140°, 145° or 150°, etc.

[0133] In this way, the extension direction of the fibers in the triaxial fabric intersects with the extension direction of the unidirectional fibers, and the fibers in the three extension directions in the triaxial fabric are distributed as evenly as possible in the circumferential direction. For example, α is 45°, β is 90°, and γ is 145°, so that the angle between any two adjacent extension directions of the four fibers of the triaxial fabric and the unidirectional fibers is 45°. With this arrangement, the fibers in the triaxial fabric intersect with the unidirectional fibers, and the extension directions of the three fibers in the triaxial fabric are distributed more evenly in the circumferential direction, so that the expansion beam 13 formed by processes such as pultrusion has a stronger structural strength, especially in the direction perpendicular to the unidirectional fibers and the triaxial fabric, and has stronger mechanical properties, which is conducive to further improving the structural strength of the expansion beam 13.

[0134] In some embodiments, the reinforcement 132 includes multiple layers of multi-axial fabric arranged in a stacked arrangement.

[0135] Optionally, the angles of the fibers in different layers of multi-axial fabrics may be completely the same, partially the same, or completely different, and may be selected according to actual needs.

[0136] This is beneficial to further improve the structural strength of the expansion beam 13, especially in the direction perpendicular to the unidirectional fragrant fiber and the multi-axial fabric, and has a stronger structural strength.

[0137] In some embodiments, Figure 6As shown, the relationship between the thickness d1 of the reinforcement portion 132 and the thickness d of the wall portion of the corresponding expansion beam 13 satisfies: 3 / 40≤d1 / d≤9 / 20.

[0138] It is understandable that the thickness d of the expansion beam 13 at different locations and the thickness d1 of the reinforcement portion 132 are not exactly the same, and the corresponding d1 / d values ​​are also different. If 3 / 40≤d1 / d≤9 / 20 is set, d1 / d of the expansion beam 13 at any location satisfies the above relationship.

[0139] Optionally, d1 / d can be 3 / 40, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.12, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45 or 9 / 20, etc.

[0140] The inventors have found through systematic analysis and long-term practice that setting 3 / 40≤d1 / d≤9 / 20 is beneficial to further improve the structural strength of the expansion beam 13 .

[0141] In some embodiments, Figure 6 As shown, the thickness d of the wall portion of the expansion beam 13 satisfies: 2 mm ≤ d ≤ 4 mm.

[0142] The thickness of the wall of the expansion beam 13 may be the sum of the thickness of the main body 131 and the reinforcement portion 132 on the surface thereof.

[0143] The thickness d of the expansion beam 13 at different locations may be the same or different, and the thickness d of the expansion beam 13 at any location satisfies the above relationship.

[0144] Optionally, d may be 2 mm, 2.5 mm, 3 mm, 3.5 mm or 4 mm, etc.

[0145] After systematic analysis and long-term practice, the inventors found that setting 2mm≤d≤4mm is beneficial to improving the structural strength of the expansion beam 13 while also helping to lightweight the expansion beam 13 , thereby helping to reduce the weight of the box body 11 .

[0146] In some embodiments, Figure 7 As shown, the expansion beam 13 has a cavity 133 , and the reinforcement portion 132 is disposed on a side of the main body portion 131 facing the cavity 133 .

[0147] Optionally, the cavity 133 may be closed, or the cavity 133 may be connected to the outside. When the box body 11 is used in the battery 10, the expansion of the battery cell 30 will produce a squeezing force on the expansion beam 13, and the expansion beam 13 will deform, and the deformation of the expansion beam 13 can be avoided by the space inside the cavity 133. Of course, the cavity 133 can also be a structure used to cooperate with other structures of the box body 11.

[0148] The reinforcing portion 132 is disposed on a side of the main body 131 facing the cavity 133 , that is, the reinforcing portion 132 is disposed on the inner wall of the cavity 133 , which is beneficial to improving the structural strength of the expansion beam 13 .

[0149] In some embodiments, Figure 6 and Figure 7 As shown, the reinforcement portion 132 is disposed on a side of the main body portion 131 facing away from the cavity 133 .

[0150] The reinforcement portion 132 is arranged on the side of the main body 131 facing away from the cavity 133, and the reinforcement portion 132 can be arranged on the outer surface of the expansion beam 13. When the expansion beam 13 is subjected to an extrusion force, the main body 131 and the reinforcement portion 132 bear the external extrusion force as a whole, which is beneficial to improving the structural strength of the expansion beam 13.

[0151] In some embodiments, Figure 7 As shown, the expansion beam 13 has a plurality of cavities 133 , the plurality of cavities 133 are independent of each other, and a reinforcement portion 132 is provided on one side of the main body 131 facing any cavity 133 .

[0152] The expansion beam 13 is provided with a plurality of cavities 133, and the plurality of cavities 133 can be arranged in one direction so that the plurality of cavities 133 respectively abut against the battery cells 30. The plurality of cavities 133 are independent of each other, and the plurality of cavities 133 can be deformed independently, which is beneficial to improving the ability of the expansion beam 13 to buffer deformation.

[0153] The main body 131 is provided with a reinforcing portion 132 on one side facing any cavity 133 , which is beneficial to further improve the structural strength of the expansion beam 13 .

[0154] In some embodiments, Figure 7 As shown, the expansion beam 13 includes a buffer portion 13a and a bearing portion 13b, wherein the bearing portion 13b is disposed on a side of the buffer portion 13a facing away from the battery cell 30. The battery 10 further includes an electrical component, which is disposed on the bearing portion 13b.

[0155] The bearing portion 13b is arranged on the side of the buffer portion 13a facing away from the battery cell 30. During the expansion and deformation of the battery cell 30, the deformation of the buffer portion 13a can be used to buffer the expansion and deformation of the battery cell 30. The bearing portion 13b can be used to carry electrical components, and the buffer portion 13a can be used to buffer the impact force borne by the electrical components, which is beneficial to reduce the damage to the electrical components caused by external force majeure and further improve the reliability of the battery 10.

[0156] It is understandable that when the battery 10 is subjected to impact force, in order to further reduce the impact force borne by the electrical components, the bearing portion 13b can be provided with a cavity 133 so that the bearing portion 13b can be deformed in time under the impact load to reduce the impact load borne by the electrical components.

[0157] In some embodiments, Figure 5 and Figure 8 As shown, the box body 12 includes a frame 121 , the frame 121 includes a first beam 1211 and a second beam 1212 , the second beam 1212 includes rolled steel, and at least one end of the first beam 1211 is riveted or welded to the second beam 1212 .

[0158] If the second beam 1212 includes rolled steel, the second beam 1212 can be formed by a rolling process, which is conducive to simplifying the processing technology of the second beam 1212. Since the material of the second beam 1212 includes steel, the second beam 1212 can be connected to the first beam 1211 by welding or riveting, which is conducive to simplifying the process difficulty of the first beam 1211 and the second beam 1212.

[0159] At least one end of the first beam 1211 is riveted or welded to the second beam 1212, and the extension directions of the first beam 1211 and the second beam 1212 are arranged to intersect. Optionally, both ends of the first beam 1211 can be riveted or welded to the second beam 1212, or one end of the first beam 1211 can be welded or riveted to the second beam 1212, which can be selected according to actual needs.

[0160] Setting the second beam 1212 to include rolled steel is beneficial to simplifying the forming process of the second beam 1212, and the second beam 1212 can be connected to the first beam 1211 by welding or riveting, which is beneficial to simplifying the connection process of the first beam 1211 and the second beam 1212, and further beneficial to reducing the process difficulty in the preparation process of the box body 11.

[0161] In some embodiments, Figure 5 and Fig. 9As shown, the box body 12 further includes an inner liner 122 , which is supported by the frame 121 . The inner liner 122 has a receiving cavity 11 a , and the expansion beam 13 is disposed in the receiving cavity 11 a and supported by the inner liner 122 .

[0162] A box body 11 is provided with an inner liner 122, and the inner liner 122 has a accommodating cavity 11a. When the box body 11 is used in the battery 10, the battery cell 30 is accommodated in the inner liner 122. The inner liner 122 can be used to provide a certain thermal insulation performance for the battery cell 30, reduce the risk of excessive temperature fluctuation of the battery cell 30, which is beneficial to improve the temperature stability of the battery cell 30, and further help to improve the stability of the performance of the battery 10.

[0163] In some embodiments, Fig. 9 and Fig.10 As shown, the inner liner 122 includes an inner liner body 1221, and the inner liner body 1221 is made of a composite material.

[0164] The liner body 1221 is made of composite material, and the liner body 1221 can be formed by fiber or fabric and resin through a pultrusion process or a molding process.

[0165] The composite material has good thermal insulation performance and is light in weight. Thus, the thermal insulation performance of the inner liner 122 is better, and the inner liner 122 has better air tightness and better isolation from the external environment, which is beneficial to further improve the thermal insulation performance of the inner liner 122 for the battery cell 30, thereby improving the reliability of the battery 10.

[0166] In some embodiments, Fig. 9 and Fig.10 As shown, the inner liner 122 further includes a heat conducting member 1222 , and the heat conducting member 1222 is disposed inside the inner liner body 1221 .

[0167] The heat conducting member 1222 may be made of a metal material, and may optionally include a metal plate. The heat conducting member 1222 is disposed inside the liner body 1221, and the heat conducting member 1222 may be embedded inside the liner body 1221 before the liner body 1221 is formed.

[0168] The heat conductor 1222 is arranged inside the inner liner body 1221 to improve the heat exchange efficiency between the battery cell 30 and the inner liner 122 . When the temperature of the battery cell 30 is high, it is beneficial to dissipate the heat of the battery cell 30 in time, thereby improving the reliability of the battery 10 .

[0169] In some embodiments, Fig. 9 , Fig.10 , Fig.11 and Fig.12As shown, the inner liner 122 includes a bottom wall 122a, and the bottom wall 122a includes a bottom wall 122a body and a convex portion 122b. The convex portion 122b is protruded relative to the bottom wall 122a body toward one side of the accommodating cavity 11a, and a recess 122c is formed on the side of the bottom wall 122a away from the accommodating cavity 11a at a position corresponding to the convex portion 122b, and at least a portion of the first beam 1211 is accommodated in the recess 122c.

[0170] The bottom wall 122a includes a bottom wall 122a body and a convex portion 122b. The bottom wall 122a body and the convex portion 122b can be integrally formed through a molding process during the preparation of the inner liner 122, and a concave portion 122c is formed on the side of the convex portion 122b away from the accommodating cavity 11a. Therefore, the convex portion 122b and the concave portion 122c are arranged opposite to each other.

[0171] At least part of the first beam 1211 is accommodated in the recess 122c. Optionally, part of the first beam 1211 may be arranged in the recess 122c, or the entire first beam 1211 may be arranged in the recess 122c.

[0172] Arranging at least a portion of the first beam 1211 to be accommodated in the recess 122 c is beneficial to increasing the matching area between the first beam 1211 and the inner liner 122 , thereby facilitating increasing the connection strength between the inner liner 122 and the first beam 1211 .

[0173] In some embodiments, Fig. 9 , Fig.10 , Fig.11 , Fig.12 and Fig.13 As shown, the expansion beam 13 has a plurality of cavities 133, the cavities 133 include a buffer cavity 133a and an avoidance cavity 133b, the avoidance cavity 133b has an opening 133c on the side facing the bottom wall 122a, and at least a portion of the protrusion 122b is disposed in the avoidance cavity 133b via the opening 133c.

[0174] The cavity 133 includes a buffer cavity 133a and an avoidance cavity 133b, and the buffer cavity 133a can be closed and opposite to the battery cell 30, so as to deform under the expansion force of the battery cell 30 and buffer the extrusion force of the battery cell 30 on the expansion beam 13. The avoidance cavity 133b has an opening 133c, and at least part of the convex part 122b is arranged in the avoidance cavity 133b through the opening 133c. The expansion beam 13 cooperates with the convex part 122b of the expansion beam 13 through the avoidance cavity 133b, which is conducive to increasing the matching area between the expansion beam 13 and the inner liner 122, thereby improving the connection strength between the expansion beam 13 and the inner liner 122.

[0175] In some embodiments, the inner liner 122 and the second beam 1212 are attached to each other and bonded together.

[0176] The inner liner 122 and the second beam 1212 are arranged to be bonded to each other, which is beneficial to increasing the matching area between the two, so that the inner liner 122 and the surface of the second beam 1212 are fully connected to absorb the dimensional error between the inner liner 122 and the second beam 1212 during the assembly process, which is beneficial to reducing the process difficulty during the assembly process of the box body 11.

[0177] In some embodiments, Figure 5 , Fig.12 and Fig.13 As shown, the box body 11 further includes a connecting member 14 , and the connecting member 14 connects the second beam 1212 , the inner container 122 and the first beam 1211 .

[0178] The connecting member 14 may be in an “L” shape, with a portion of the connecting member 14 connecting the second beam 1212 and the inner liner 122 , and another portion of the connecting member 14 connecting the first beam 1211 and the inner liner 122 .

[0179] The connection member 14 is provided to improve the connection strength between the inner liner 122 and the first beam 1211 and the second beam 1212 , and is also beneficial to the connection process between the inner liner 122 and the frame 121 .

[0180] In a second aspect, the electrical device provided in the embodiment of the present application includes the battery 10 provided in the above embodiment, and the battery 10 is used to provide electrical energy.

[0181] The electric device provided in the embodiment of the present application has the same technical effect as the battery 10 provided in any of the above embodiments, and thus will not be described in detail here.

[0182] In some embodiments, Figures 5 to 13As shown, the battery 10 includes a box body 11 and a battery cell 30, the box body 11 includes a box body 12 and an expansion beam 13, the box body 12 includes a frame 121 and an inner liner 122, the frame 121 includes a first beam 1211 and a second beam 1212, the second beam 1212 includes rolled steel, and at least one end of the first beam 1211 is riveted or welded to the second beam 1212. The inner liner 122 is supported by the frame 121, the inner liner 122 has a receiving cavity 11a, and the expansion beam 13 is arranged in the receiving cavity 11a and supported by the inner liner 122. The expansion beam 13 is arranged in the receiving cavity 11a, the expansion beam 13 includes a main body 131 and a reinforcement part 132, the reinforcement part 132 is arranged on the surface of the main body 131, the main body 131 includes unidirectional fibers and a first adhesive, the reinforcement part 132 includes a multi-axial fabric and a second adhesive, and the extension direction of the fibers in the multi-axial fabric intersects with the extension direction of the unidirectional fibers. The multi-axial fabric includes a tri-axial fabric, and the angles of the extension direction of the unidirectional fiber to the extension direction of the fiber in the tri-axial fabric in the counterclockwise direction are α, β and γ respectively, 30°≤α≤45°, 80°≤β≤100°, and 135°≤γ≤150°. The reinforcement part 132 includes a plurality of layers of multi-axial fabrics stacked, and the relationship between the thickness d1 of the reinforcement part 132 and the thickness d of the wall of the corresponding expansion beam 13 satisfies: 3 / 40≤d1 / d≤9 / 20, and the thickness d of the wall of the expansion beam 13 satisfies: 2mm≤d≤4mm. The expansion beam 13 has a cavity 133, and the reinforcement part 132 is arranged on the side of the main body 131 facing the cavity 133 and the side of the main body 131 facing away from the cavity 133. The expansion beam 13 has a plurality of cavities 133, and the plurality of cavities 133 are independent of each other. The reinforcement part 132 is arranged on the side of the main body 131 facing any cavity 133. The expansion beam 13 includes a buffer portion 13a and a bearing portion 13b, and the bearing portion 13b is arranged on the side of the buffer portion 13a facing away from the battery cell 30. The battery 10 also includes an electrical component, and the electrical component is arranged on the bearing portion 13b. The liner 122 includes an liner body 1221 and a heat conductor 1222, and the liner body 1221 is made of a composite material, and the heat conductor 1222 is arranged inside the liner body 1221. The liner 122 includes a bottom wall 122a, and the bottom wall 122a includes a bottom wall 122a body and a convex portion 122b, and the convex portion 122b is protruded relative to the bottom wall 122a body toward one side of the accommodating cavity 11a, and a concave portion 122c is formed on the side of the bottom wall 122a away from the accommodating cavity 11a at a position corresponding to the convex portion 122b, and at least part of the first beam 1211 is accommodated in the concave portion 122c. The cavity 133 includes a buffer cavity 133a and an avoidance cavity 133b. The avoidance cavity 133b has an opening 133c on one side facing the bottom wall 122a. At least a portion of the protrusion 122b is disposed in the avoidance cavity 133b via the opening 133c.The inner liner 122 and the second beam 1212 are attached to each other and bonded together. The box body 11 also includes a connecting member 14, which connects the second beam 1212, the inner liner 122 and the first beam 1211.

[0183] The battery 10 provided in the embodiment of the present application is provided with an expansion beam 13 including a main body portion 131 and a reinforcement portion 132, and the main body portion 131 includes unidirectional fibers, the reinforcement portion 132 includes a multi-axial fabric, and the extension direction of the fibers in the multi-axial fabric is arranged to intersect with the extension direction of the unidirectional fibers. The expansion beam 13 formed in this way has high structural strength, especially in the direction perpendicular to the multi-axial fabric and the unidirectional fibers, which is beneficial to improving the structural strength and mechanical properties of the expansion beam 13. During the expansion and deformation of the battery cell 30, a large extrusion pressure is generated on the expansion beam 13. Since the expansion beam 13 has a high structural strength, it can withstand the large expansion force of the battery cell 30, which is beneficial to improving the reliability performance of the battery 10.

[0184] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery, characterized in that: include: A box body, comprising a box body and an expansion beam, wherein the box body has a containing cavity, the expansion beam is arranged in the containing cavity, the expansion beam comprises a main body portion and a reinforcement portion, the reinforcement portion is arranged on the surface of the main body portion, the main body portion comprises unidirectional fibers and a first adhesive, the reinforcement portion comprises a multi-axial fabric and a second adhesive, and the extension direction of the fibers in the multi-axial fabric intersects with the extension direction of the unidirectional fibers; The battery cell is arranged in the accommodating cavity and is located on one side of the expansion beam.

2. The battery according to claim 1, characterized in that The multi-axial fabric includes a tri-axial fabric, in which the fibers in the tri-axial fabric have three extending directions, and the extending direction of the fibers in the tri-axial fabric intersects with the extending direction of the unidirectional fibers.

3. The battery according to claim 2, characterized in that In the counterclockwise direction, the angles of the extending direction of the unidirectional fibers to the extending direction of the fibers in the triaxial fabric are α, β and γ, respectively, 30°≤α≤45°, 80°≤β≤100°, and 135°≤γ≤150°.

4. The battery according to claim 1, characterized in that The reinforcement portion includes a plurality of layers of the multi-axial fabric that are stacked.

5. The battery according to claim 1, characterized in that The relationship between the thickness d1 of the reinforcement portion and the corresponding thickness d of the wall portion of the expansion beam satisfies: 3 / 40≤d1 / d≤9 / 20.

6. The battery according to claim 1, characterized in that The thickness d of the wall portion of the expansion beam satisfies: 2mm≤d≤4mm.

7. The battery according to claim 1, characterized in that The expansion beam has a cavity, the reinforcement portion is arranged on a side of the main body portion facing the cavity, and / or the reinforcement portion is arranged on a side of the main body portion facing away from the cavity.

8. The battery according to claim 7, characterized in that The expansion beam has a plurality of cavities, the plurality of cavities are independent of each other, and the reinforcing portion is provided on a side of the main body facing any one of the cavities.

9. The battery according to claim 1, characterized in that The expansion beam comprises a buffer portion and a bearing portion, wherein the bearing portion is arranged on a side of the buffer portion facing away from the battery cell; The battery further includes an electrical component, and the electrical component is disposed on the carrying portion.

10. The battery according to any one of claims 1 to 9, characterized in that: The box body comprises a frame, the frame comprises a first beam and a second beam, the second beam comprises rolled steel, and at least one end of the first beam is riveted or welded to the second beam.

11. The battery according to claim 10, characterized in that The box body also includes an inner liner, which is supported by the frame and has the accommodating cavity. The expansion beam is arranged in the accommodating cavity and supported by the inner liner.

12. The battery according to claim 11, characterized in that The liner comprises an liner body, and the liner body is made of a composite material.

13. The battery according to claim 12, characterized in that The inner container further comprises a heat conducting member, and the heat conducting member is arranged inside the inner container body.

14. The battery according to claim 11, characterized in that The inner tank includes a bottom wall, which includes a bottom wall body and a convex portion. The convex portion is protruded relative to the bottom wall body toward one side of the accommodating cavity, and a concave portion is formed on the side of the bottom wall away from the accommodating cavity at a position corresponding to the convex portion, and at least a portion of the first beam is accommodated in the concave portion.

15. The battery according to claim 14, characterized in that The expansion beam has a plurality of cavities, including a buffer cavity and an avoidance cavity. The avoidance cavity has an opening on a side facing the bottom wall, and at least a portion of the convex portion is arranged in the avoidance cavity via the opening.

16. The battery according to claim 11, characterized in that The inner liner and the second beam are attached to each other and bonded together; and / or the box body further includes a connecting piece, and the connecting piece connects the second beam, the inner liner and the first beam.

17. An electrical device, characterized in that: The battery comprises a battery as claimed in any one of claims 1 to 16, wherein the battery is used to provide electrical energy.

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