Box body, battery and electric equipment

Abstract

The embodiment of the invention provides a box body, a battery and electric equipment. The box body comprises a box body; the beam body is arranged on the box body and used for receiving acting force from the first direction, and a preset included angle is formed between the first direction and the extending direction of the beam body; wherein the beam body is made of a non-metal composite material. According to the box body, the battery and the electric equipment provided by the embodiment of the invention, the structural deformation of the box body can be effectively reduced.

Description

Technical Field

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

[0002] The box is usually used to hold some components. During the operation of the components, the box may be at risk of structural deformation. For example, during the charging and discharging process, the battery box will expand and easily cause the box structure to deform, thus affecting the performance of the battery. Summary of the invention

[0003] The embodiments of the present application provide a box, a battery and an electrical device, which can improve the performance of the battery.

[0004] In a first aspect, a box body is provided, comprising: a box body; a beam body, arranged on the box body, the beam body being used to receive a force from a first direction, the first direction forming a preset angle with an extension direction of the beam body; wherein the material of the beam body comprises a non-metallic composite material.

[0005] In this embodiment, by arranging a beam in the box body to bear the force from the first direction, the structural deformation of the box body can be effectively reduced, especially when the box body is used to accommodate battery cells, the arrangement of the beam body can bear the expansion force from the battery cells, reducing the possibility of deformation of the box body. In addition, the beam body made of non-metallic composite materials can not only play an insulating effect, but also reduce the weight of the box body, and when the box body accommodates battery cells, it can greatly improve the energy density of the battery.

[0006] In one possible implementation, the beam body includes a first side wall and a second side wall arranged opposite to each other along a first direction, the first side wall is used to receive the force from the first direction, and the box body also includes: a limiting structure, along the first direction, the limiting structure is arranged between the second side wall and the side wall of the box body, the limiting structure is used to support the beam body to limit the movement of the beam body along the direction toward the side wall of the box body.

[0007] In this embodiment, along the first direction, by providing a limiting structure between the second side wall of the beam body and the side wall of the box body, the beam body can be limited from moving in the direction toward the side wall of the box body under the action of the first direction, thereby enhancing the strength of the box body. In addition, the existence of the limiting structure can also play a role in the installation and positioning of the beam body, thereby saving the tooling cost of the beam body.

[0008] In a possible implementation manner, the limiting structure and the second side wall are fixedly connected.

[0009] In this embodiment, the limiting structure and the second side wall are fixedly connected to further enhance the strength of the box body.

[0010] In a possible implementation, the limiting structure is provided with at least two glue injection holes spaced apart along the second direction, the glue injection holes are used to introduce structural glue into between the limiting structure and the second side wall, the limiting structure and the second side wall are fixedly connected by the structural glue, and the second direction is the extension direction of the beam body.

[0011] In this embodiment, the limiting structure is provided with at least two glue injection holes spaced apart along the second direction to introduce the structural glue into between the limiting structure and the second side wall, which can enhance the fixing strength between the limiting structure and the beam body so that the limiting structure can better support the beam body.

[0012] In a possible implementation, the limiting structure is provided with at least two rivet holes spaced apart along the second direction, the limiting structure and the second side wall are fixedly connected by rivets inserted into the rivet holes, and the second direction is the extension direction of the beam body.

[0013] In this embodiment, the limiting structure is provided with at least two rivet holes spaced apart along the second direction. The limiting structure and the beam body are fixed together by rivets inserted into the rivet holes, which can enhance the fixing strength between the limiting structure and the beam body so that the limiting structure can better support the beam body.

[0014] In a possible implementation, the limiting structure includes at least two limiting plates spaced apart along a second direction, and the second direction is an extension direction of the beam body.

[0015] In this embodiment, by supporting the beam body with at least two limiting plates spaced apart along the second direction, the strength of the box body can be enhanced while buffering the force.

[0016] In a possible implementation, the limiting structure includes a limiting strip extending along a second direction, and the second direction is an extension direction of the beam body.

[0017] In this embodiment, the beam body is supported by the limiting strips extending along the second direction, so that the strength of the box body can be enhanced while buffering the force.

[0018] In a possible implementation, the limiting structure includes at least two blocks spaced apart along the second direction, two ends of the blocks along the first direction respectively abut against the second side wall and the side wall of the box body, and the second direction is the extension direction of the beam body.

[0019] In this embodiment, the beam is supported by at least two blocks spaced apart along the second direction, and because the two ends of the blocks along the first direction respectively abut against the second side wall and the side wall of the box body, the strength of the box body can be further enhanced while effectively transmitting the force.

[0020] In one possible implementation, the block includes a main body and two extension parts, wherein the two ends of the main body along the first direction respectively abut against the second side wall and the side wall of the box body, and the two extension parts respectively extend away from the main body along the second direction from one end of the main body abutting against the second side wall.

[0021] In this embodiment, the stopper includes a main body and two extension parts, and the two ends of the main body along the first direction respectively abut against the second side wall of the beam body and the side wall of the box body, and the two extension parts extend away from the main body along the second direction from one end of the main body abutting against the beam body. On the one hand, the beam body can be supported by the main body to effectively transfer the force load, and on the other hand, the stopper can be fixed to the beam body through the extension part to improve the strength of the box body.

[0022] In a possible implementation manner, the main body is a hollow structure.

[0023] In this embodiment, the main body is configured as a hollow structure, which can reduce the weight of the box while effectively alleviating the force, thereby improving the energy density of the battery.

[0024] In a possible implementation, notches are respectively provided at both ends of the limiting plate along the second direction, and the notches are used to introduce the structural adhesive into between the limiting plate and the second side wall.

[0025] In this embodiment, notches for introducing structural adhesive are respectively provided at both ends of the limiting plate along the second direction, so that the structural adhesive can be more evenly coated between the limiting plate and the second side wall, thereby enhancing the load transfer of the acting force.

[0026] In a possible implementation, the box body and the limiting structure are integrally formed.

[0027] In this embodiment, the box body and the limiting structure can be integrally formed, thereby enhancing the strength of the box body.

[0028] In a possible implementation, the housing is a die-cast housing.

[0029] In this embodiment, the die-cast box body has a simpler structure and process flow than the profile box body, and has high mass production efficiency. In addition, the die-cast box body forming process can be used to easily add related stop and buffer features, and the stop structure can be integrally formed while the box body is die-cast, which has high process feasibility and relatively low investment.

[0030] In a possible implementation, a wall of the beam body that is perpendicular to the height direction of the box body is fixedly connected to the box body.

[0031] In this embodiment, the wall of the beam body perpendicular to the height direction of the box body is fixedly connected to the box body, which can further enhance the strength of the box body.

[0032] In a second aspect, a battery is provided, comprising a battery cell and a box as in the first aspect and any possible implementation of the first aspect, the box being used to accommodate the battery cell, and a beam in the box being used to receive expansion force from the battery cell.

[0033] In a third aspect, an electrical device is provided, comprising the battery in the second aspect, wherein the battery is used to provide electrical energy to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0035] Figure 1 It is a structural schematic diagram of a vehicle disclosed in one embodiment of the present application.

[0036] Figure 2 It is a schematic diagram of the structure of a battery disclosed in one embodiment of the present application.

[0037] Figure 3 It is a structural schematic diagram of a box disclosed in an embodiment of the present application.

[0038] Figure 4 It is a structural schematic diagram of a beam body disclosed in one embodiment of the present application.

[0039] Figure 5 It is a schematic structural diagram of a box disclosed in another embodiment of the present application.

[0040] Figure 6 It is a structural schematic diagram of a box body disclosed in yet another embodiment of the present application.

[0041] Figure 7 It is a structural schematic diagram of a box body disclosed in yet another embodiment of the present application.

[0042] Figure 8 yes Figures 5 to 7 A ZX plane diagram of the box in FIG.

[0043] Fig. 9 yes Figures 5 to 7 Another ZX plane diagram of the box in FIG.

[0044] Fig.10 It is a schematic diagram of the structure of the die-cast box body of an embodiment of the present application.

[0045] In the drawings, the drawings are not drawn to scale.

[0046] Description of the drawings: 1-vehicle; 80-motor; 60-controller; 100-battery; 111-first part; 112-second part; 200-box; 210-box body; 220-beam; 211-side wall of box body; 221-first cavity; 212-first wall of box body; 230-limiting structure; 222-first side wall of beam; 223-second side wall of beam; 224-wall of beam perpendicular to the height direction of box; 231-limiting plate; 2301-glue injection hole; 2302-rivet hole; 2310-notch; 232-limiting strip; 233-block; 2331-main body; 2332-extension; 240-structural glue; 250-rivet; Z-height direction; X-first direction; Y-second direction. DETAILED DESCRIPTION

[0047] 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 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.

[0048] 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 to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings 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.

[0049] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0050] 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.

[0051] 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.

[0052] The term "multiple" as used in this 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).

[0053] In addition, the term “vertical” or “parallel” in the present application may be understood as substantially vertical, or substantially parallel, which means that a certain range of manufacturing tolerances needs to be considered.

[0054] 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.

[0055] 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 hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc., treated with silver surface, may 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.).

[0060] 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 traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.

[0061] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0062] 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 or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may 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 (copper, copper 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.).

[0063] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0064] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0065] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells 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, lithium titanate, etc.

[0066] In some embodiments, the negative electrode may be a foam metal. The foam metal may be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, etc. When the foam metal is used as the negative electrode plate, the surface of the foam metal may not be provided with a negative electrode active material, but of course, a negative electrode active material may also be provided.

[0067] As an example, a lithium source material, potassium metal or sodium metal may be filled or / and deposited in the negative electrode current collector, and the lithium source material is lithium metal and / or lithium-rich material.

[0068] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0069] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0070] 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.

[0071] As an example, the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0072] 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.

[0073] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0074] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0075] In some embodiments, the electrode assembly is a laminate structure.

[0076] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0077] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet is folded to form a plurality of stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0078] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded sections.

[0079] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0080] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0081] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0082] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0083] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. 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. The housing includes a shell and a cover plate.

[0084] 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 battery, such as a hexagonal battery, etc. There is no special limitation in this application.

[0085] The battery mentioned in the embodiments of the present application may include one or more battery cells to provide a single physical module with higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in mixed connection through a busbar component.

[0086] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0087] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0088] 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 cross beam and longitudinal beam of the vehicle.

[0089] As the positive and negative active materials embed or extract ions during the battery's charge and discharge cycle, the battery monomer system's side reaction accumulation thickness and graphite sheet peeling cause the battery monomer to expand, that is, the positive and negative electrode sheets expand outward, causing the box to deform structurally and bulge, thereby causing the battery's airtightness to fail, which has an adverse effect on the battery's performance and practical life.

[0090] To this end, the embodiment of the present application provides a box body, which can effectively reduce the structural deformation of the box body by arranging a beam body in the box body to withstand the force from the first direction, especially when the box body is used to accommodate battery cells, the arrangement of the beam body can withstand the expansion force from the battery cells, reducing the possibility of deformation of the box body. In addition, the beam body made of non-metallic composite materials can not only play an insulating effect, but also reduce the weight of the box body, and when the box body accommodates battery cells, it can greatly improve the energy density of the battery.

[0091] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using batteries.

[0092] Electrical equipment may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, and the like. Vehicles may be fuel vehicles, gas vehicles, or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles, or extended-range vehicles, and the like; spacecraft include airplanes, rockets, space shuttles, and spacecraft, and the like; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical equipment.

[0093] It should be noted that the box body of the embodiment of the present application is not limited to the box body of the battery, and can be a box body that accommodates any components that may exert force on the box body and cause the box body to deform. However, for the convenience of explanation, the following description will take the box body of the battery as an example.

[0094] The following is an example of a vehicle as an electrical equipment. Figure 1 This is a schematic diagram of the structure of a vehicle 1 according to an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 80, a controller 60 and a battery 100 may be provided inside the vehicle 1. The controller 60 is used to control the battery 100 to supply power to the motor 80. For example, a battery 100 may be provided at the bottom, front or rear of the vehicle 1. The battery 100 may be used to supply power to the vehicle 1. For example, the battery 100 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 start-up, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery 100 may not only be used 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.

[0095] Figure 2 The schematic diagram of the structure of a battery 100 according to an embodiment of the present application is shown. The battery 100 may include a plurality of battery cells (not shown in the figure). The battery 100 may also include a box (or cover), the interior of the box is a hollow structure, and the plurality of battery cells are accommodated in the box. Figure 2 As shown, the box body may include two parts, which are respectively referred to as the first part 111 and the second part 112, and the first part 111 and the second part 112 are buckled together. The shapes of the first part 111 and the second part 112 may be determined according to the shapes of the combination of multiple battery cells, and the first part 111 and the second part 112 may both have an opening. For example, the first part 111 and the second part 112 may both be hollow cuboids and each has only one face as an opening face, the openings of the first part 111 and the second part 112 are arranged opposite to each other, and the first part 111 and the second part 112 are buckled together to form a box body with a closed chamber. Multiple battery cells are connected in parallel, in series, or in a mixed combination and are placed in the box body formed by buckling the first part 111 and the second part 112.

[0096] Optionally, the battery 100 may further include other structures, which will not be described in detail here.

[0097] Figure 3 FIG. 2 shows a schematic diagram of the structure of the box 200 in the embodiment of the present application. Figure 3 As shown, the box body 200 may include a box body 210; a beam body 220, which is arranged in the box body 210, and the beam body 220 is used to receive a force from a first direction X, and the first direction X and the extension direction Y of the beam body 220 form a preset angle, wherein the material of the beam body 220 is a non-metallic composite material.

[0098] The box body 210 may be the main structure of the box body 200. Optionally, the box body 210 may include: Figure 2 The first part 111 and the second part 112 are shown. For the sake of brevity, the specific structure of the box body 210 is not described here.

[0099] Generally, the beam body 220 is a long strip structure, and the extension direction Y of the beam body 220 can be considered as the length direction of the beam body 220. Optionally, the first direction X and the extension direction Y of the beam body 220 can be 90°. In other words, the first direction X can be perpendicular to the extension direction Y of the beam body 220. In other embodiments, the first direction X and the extension direction Y of the beam body 220 can also be at other angles. For example, 75°, 80°, etc., that is, the beam body 220 can be tilted in the box body 210, that is, it can be not parallel to the side wall of the box body 210.

[0100] Typically, the material of the beam body 220 may be a metal material. For example, the material of the beam body 220 is aluminum. When the box body 200 is applied to a battery, when the battery cell expands, the battery cell may contact the beam body 220. Therefore, an insulating layer needs to be provided between the beam body 220 and the battery cell. For example, a TC composite tape may be pasted on the surface of the beam body 220 to provide an insulating protection. The TC composite tape is generally a ceramic silicone rubber material with high temperature resistance and high insulation capability. However, the combination of the metal beam body 220 and the large-area pasting of the TC composite tape has a high cost and cannot reduce the volume of the battery, thereby affecting the energy density of the battery.

[0101] Therefore, in the embodiment of the present application, the material of the beam body 220 can be set to a non-metallic material. Non-metallic materials refer to materials other than metal materials. There are mainly various types of polymer materials (plastics, rubbers, synthetic fibers, and some adhesives, etc.) or ceramic materials (various pottery, porcelain, refractory materials, glass, and cement, etc.). Furthermore, the material of the beam body 220 can be a non-metallic composite material. That is, a material synthesized from two or more different non-metallic materials. For example, the beam body 220 can be made by the following processes: glass fiber unwinding, resin injection, curing, pulling, and cutting.

[0102] In addition, for the convenience of description, the force received by the beam body 220 in the first direction X is often used as the expansion force of the battery cell in the first direction X. However, those skilled in the art will appreciate that the present embodiment of the application does not limit this.

[0103] In this embodiment, by arranging the beam body 220 in the box body 210 to bear the force from the first direction X, the structural deformation of the box body 200 can be effectively reduced, especially when the box body 200 is used to accommodate battery cells, the arrangement of the beam body 220 can bear the expansion force from the battery cells, and reduce the possibility of deformation of the box body 200. In addition, the beam body 220 made of non-metallic composite materials can not only play an insulating effect, but also reduce the weight of the box body 200, and when the box body accommodates battery cells, the energy density of the battery can be greatly improved.

[0104] Alternatively, if Figure 3 As shown, a plurality of beams 220 may be disposed in the box body 210 along the first direction X. In other words, a plurality of beams 220 may be disposed inside the box body 210, and the plurality of beams 220 may be disposed at intervals along the first direction X to divide the internal space of the box body 210 into at least one accommodation space. For example, a beam 220 may be disposed at each end of the box body 210 in the first direction X, and the space between the two beams 220 may be used to accommodate battery cells.

[0105] Optionally, when the box 200 is applied to a battery, the first direction X may be the stacking direction of the positive electrode sheets and the negative electrode sheets of the electrode assembly in the battery cell. For example, if the box 200 is square in shape and the battery cells are arranged in an array on a plane perpendicular to the height direction Z of the box 200, the first direction X may be the length direction of the box 200 or the width direction of the box 200.

[0106] Alternatively, if Figure 4 As shown, the beam body 220 is provided with a first cavity 221 extending along the second direction Y, wherein the first direction X, the second direction Y and the height direction Z of the beam body 220 are perpendicular to each other, and the second direction Y may be the extension direction Y of the beam body 220 mentioned in the above embodiment.

[0107] For example, the first cavity 221 may be configured to provide expansion space for the battery cell. Specifically, when the battery cell expands, the first cavity 221 may be deformed in the first direction X due to the expansion force from the battery cell, thereby providing expansion space for the battery cell.

[0108] In this embodiment, by providing a first cavity 221 extending along the second direction Y in the beam body 220 , the weight of the box body 200 can be further reduced, and when the box body 200 is applied to a battery, the energy density of the battery can be further improved.

[0109] like Figure 4 As shown, the beam body 220 may include a first side wall 222 and a second side wall 223 that are oppositely disposed along the first direction X, wherein the first side wall 222 is used to receive a force from the first direction X. Further, as Figures 5 to 9 As shown, the box body 200 may also include: a limiting structure 230, which is arranged between the second side wall 223 and the side wall 211 of the box body 210 along the first direction X, and the limiting structure 230 is used to support the beam body 220 to limit the movement of the beam body 220 in the direction toward the side wall 221 of the box body 210.

[0110] When the box body 200 is applied to a battery, the limiting structure 230 can be understood as being arranged on a side along the first direction X away from the battery cell.

[0111] During operation, battery cells may swell for a variety of reasons, which are usually related to the type of battery. For example, during the first charge and discharge of a lithium-ion battery, the electrolyte and graphite particles undergo a reduction reaction at the solid-liquid interface to form a passivation layer covering the surface of the electrode material. The formation of the passivation layer will cause the battery cells to swell. For example, during the cycle of the battery pole, when metal ions are embedded in the pole, the volume of the battery cell will increase, and when the metal ions are de-embedded, the volume of the battery cell will decrease. Most of the expansion is reversible. In order to ensure the energy density of the battery, the battery cells and the beam body are usually arranged closely in the battery box. When the battery cells swell, the beam body will be squeezed. If the strength of the beam body is insufficient, it is easy to deform when subjected to force, resulting in structural deformation of the box body. Therefore, in this embodiment, along the first direction X, by providing a limiting structure 230 between the second side wall 223 of the beam body 220 and the side wall 211 of the box body 210, the beam body 220 can be limited from moving in the direction toward the side wall 211 of the box body 210 under the action of a force in the first direction X (for example, the expansion force of the battery cell), thereby enhancing the strength of the box body 200. In addition, the existence of the limiting structure 230 can also play a role in the installation and positioning of the beam body 220, thereby saving the tooling cost of the beam body.

[0112] Optionally, the limiting structure 230 and the second side wall 223 may be fixedly connected.

[0113] In this embodiment, the limiting structure 230 is fixedly connected to the second side wall 223 , so as to further enhance the strength of the box body 200 .

[0114] Alternatively, see Figures 5 to 7 as well as Figure 8 As shown, the limiting structure 230 is provided with at least two glue injection holes 2301 spaced apart along the second direction Y, and the glue injection holes 2301 are used to introduce the structural glue 240 into between the limiting structure 230 and the second side wall 223 , and the limiting structure 230 and the second side wall 223 are fixedly connected by the structural glue 240 .

[0115] In this embodiment, the limiting structure 230 is provided with at least two glue injection holes 2301 spaced apart along the second direction Y to introduce the structural glue 240 into between the limiting structure 230 and the second side wall 223, which can enhance the fixing strength between the limiting structure 230 and the beam body 220, so that the limiting structure 230 can better support the beam body 220.

[0116] Alternatively, see Figures 5 to 7 as well as Fig. 9 As shown, the limiting structure 230 is provided with at least two rivet holes 2302 spaced apart along the second direction Y, and the limiting structure 230 and the second side wall 223 are fixedly connected by rivets 250 inserted into the rivet holes 2302 .

[0117] Specifically, the rivet 250 is inserted into the rivet hole 2302 of the limiting structure 230 and penetrates the second side wall 223. The riveting device presses against the end face of the rivet 250 to perform the riveting operation until the reverse side of the rivet 250 expands and breaks.

[0118] In this embodiment, the limiting structure 230 is provided with at least two rivet holes 2302 spaced apart along the second direction Y. The limiting structure 230 and the second side wall 223 are fixed together by inserting the rivet 250 into the rivet hole 2302, thereby enhancing the fixing strength between the limiting structure 230 and the beam body 220, so that the limiting structure 230 can better support the beam body 220.

[0119] In one embodiment, the limiting structure 230 includes at least two limiting pieces 231 spaced apart from each other along the second direction Y.

[0120] For example, Figure 5 As shown, the limiting structure 230 includes three limiting plates 231, which are arranged at intervals along the second direction Y. For example, two of the limiting plates 231 are respectively arranged close to the two ends of the beam body 220 along the second direction Y, and the other limiting plate 231 is close to the middle position of the beam body 220 along the second direction Y.

[0121] Optionally, there is a gap between the limiting pieces 231 and the side walls 211 of the box body 210 , that is, the limiting pieces 231 do not contact the side walls 211 of the box body 210 .

[0122] Optionally, the limiting piece 231 may be fixedly connected to the first wall 212 of the box body 210. The first wall 212 may be a wall perpendicular to the height direction Z of the box body 200, for example, the first wall 212 may be the bottom wall of the box body 210.

[0123] Optionally, each limiting piece 231 may be provided with at least one glue injection hole 2301 or a rivet hole 2302 .

[0124] In this embodiment, the beam body 220 is supported by at least two limiting pieces 231 spaced apart along the second direction Y, so that the strength of the box body 200 can be enhanced while buffering the expansion force.

[0125] In some embodiments, the limiting piece 231 may have a certain size along the height direction Z of the box body 200. For example, along the height direction Z of the box body 200, the size of the beam body 220 may be h, and the size of the limiting piece 231 may be at least greater than 1 / 2h, but may be less than h.

[0126] In other embodiments, the limit plate 231 may also have a certain draft angle, so that there is a gap between the limit plate 231 and the beam body 220 that can accommodate the structural adhesive 240. The structural adhesive 240 is introduced into the gap through the glue injection hole 2301 on the limit plate 231, so that the structural adhesive 240 can be more evenly coated between the limit plate 231 and the beam body 220, thereby enhancing the load transfer of the expansion force.

[0127] Optionally, continue to see Figure 5 The two ends of the limiting piece 231 along the second direction Y are respectively provided with notches 2310, and the notches 2310 are used to introduce the structural adhesive 240 between the limiting piece 231 and the beam body 220. It should be understood that the embodiment of the present application does not limit the shape of the notch 2310, for example, the shape of the notch 2310 can be square, semicircular, etc.

[0128] In this embodiment, notches 2310 for introducing the structural adhesive 240 are respectively provided at both ends of the limiting plate 231 along the second direction Y, so that the structural adhesive 240 can be more evenly coated between the limiting plate 231 and the beam body 220, thereby enhancing the load transfer of the expansion force.

[0129] It should be understood that in the embodiment of the present application, the number of the limiting pieces 231 and the size along the second direction Y can be adjusted according to the simulation results, and the size of the limiting pieces 231 along the height direction Z can also be appropriately adjusted according to actual conditions.

[0130] Alternatively, if Figure 6 As shown, the limiting structure 230 includes a limiting bar 232 extending along the second direction Y.

[0131] In some embodiments, the limit strip 232 may have a certain size along the height direction of the box body 200. For example, along the height direction Z of the box body 200, the size of the beam body 220 may be h, and the size of the limit strip 232 may be at least greater than 1 / 2h, but may be less than h. It should be understood that the size of the limit strip 232 along the height direction Z may be appropriately adjusted according to actual conditions, and the embodiments of the present application do not limit this.

[0132] In this embodiment, the beam body 220 is supported by the limiting strips 232 extending along the second direction Y, so that the strength of the box body 200 can be enhanced while buffering the force.

[0133] Optionally, in the second direction Y, the limiting strip 232 may extend from one end of the beam body 220 to the other end, so as to maximize the effect of buffering the expansion force of the battery cells and achieving the installation and positioning of the beam body 220 .

[0134] Optionally, there is a gap between the limiting strip 232 and the side wall 211 of the box body 210 , that is, the limiting strip 232 does not contact the side wall 211 of the box body 210 .

[0135] Optionally, the limiting strip 232 may be fixedly connected to the first wall 212 of the box body 210. The first wall 212 may be a wall perpendicular to the height direction Z of the box body 200, for example, the first wall 212 may be the bottom wall of the box body 210.

[0136] Optionally, the limiting strip 232 may be provided with at least one glue injection hole 2301 or rivet hole 2302. For example, the limiting strip 232 may be provided with three glue injection holes 2301 or rivet holes 2302, wherein two glue injection holes 2301 or rivet holes 2302 may be provided at both ends of the limiting strip 232 along the second direction Y, and another glue injection hole 2301 or rivet hole 2302 may be provided at the middle position of the limiting strip 232 along the second direction Y.

[0137] Alternatively, if Figure 7 As shown, the limiting structure 230 includes at least two stoppers 233 spaced apart along the second direction Y, and two ends of the stoppers 233 along the first direction X abut against the second side wall 223 and the side wall 211 of the box body 210 respectively.

[0138] The two ends of the stop block 233 along the first direction X respectively abut against the second side wall 223 and the side wall 211 of the box body 210. It can be understood that the two ends of the stop block 233 along the first direction X respectively contact the second side wall 223 and the side wall 211 of the box body 210, or there is no gap between the stop block 233 and the side wall 211 of the box body 210, and there is no gap between the stop block 233 and the second side wall 223.

[0139] Optionally, the stopper 233 may be fixedly connected to the side wall 211 of the box body 210 .

[0140] In this embodiment, the beam body 220 is supported by at least two blocks 233 spaced apart along the second direction Y, and because the two ends of the block 233 along the first direction X respectively abut against the second side wall 223 and the side wall 211 of the box body 210, the expansion force load can be effectively transmitted when the battery cell expands, thereby further enhancing the strength of the box body 200.

[0141] Optionally, continue to see Figure 7The stopper 233 may include a main body 2331 and two extensions 2332, wherein both ends of the main body 2331 along the first direction X abut against the second side wall 223 and the side wall 211 of the box body 210, respectively, and the two extensions 2332 extend away from the main body 2331 along the second direction Y from one end of the main body 2331 abutting against the second side wall 223. The main body 2331 may be understood as a main structure for supporting the beam body 220. The extensions 2332 may be understood as a structure of the stopper 233 for fixing with the beam body 220.

[0142] In some embodiments, the main body 2331 and the two extension portions 2332 may be integrally formed to enhance the strength of the stopper 233 .

[0143] In other embodiments, the main body 2331 and the two extension portions 2332 may be independent components connected together by various fixing methods.

[0144] The structure of the extension portion 2332 can refer to Figure 5 For example, at least one glue injection hole 2301 or rivet hole 2302 may be provided on each extension portion 2332. For another example, a notch may be provided at one end of the extension portion 2332 away from the main body portion 2331 along the second direction Y, and the notch is used to introduce the structural glue 240 between the stopper 233 and the second side wall 223.

[0145] In some other embodiments, the stopper 233 may have a certain size in the height direction Z of the box body 200. For example, in the height direction Z of the box body 200, the size of the beam body 220 may be h, and the size of the stopper 233 may be at least greater than 1 / 2h, but may be less than h. It should be noted that in the height direction Z of the box body 200, the size of the extension portion 2332 may be the same as or different from the size of the main body 2331, and this is not limited in the embodiment of the present application.

[0146] In this embodiment, the stopper 233 includes a main body 2331 and two extension portions 2332. The two ends of the main body 2331 along the first direction X respectively abut against the second side wall 223 and the side wall 211 of the box body 210. The two extension portions 2332 respectively extend from one end of the main body 2331 abutting against the beam body 220 along the second direction Y away from the main body 2331. On the one hand, the main body 2331 can support the beam body 220 to effectively transfer the expansion force load. On the other hand, the stopper 233 can be fixed to the beam body 220 through the extension portion 2332 to improve the strength of the box body 200.

[0147] Optionally, in the embodiment of the present application, the main body 2331 is a hollow structure.

[0148] In this embodiment, the main body 2331 is configured as a hollow structure, which can reduce the weight of the box body 200 while effectively alleviating the expansion force, thereby improving the energy density of the battery.

[0149] Optionally, in the embodiment of the present application, the box body 210 and the limiting structure 230 are integrally formed, which can enhance the strength of the box body 200 .

[0150] like Figure 4 As shown, the beam body 220 further includes a wall 224 perpendicular to the height direction Z of the box body 200. Figures 5 to 7 As shown, the wall 224 of the beam body 220 perpendicular to the height direction Z of the box body 200 is fixedly connected to the box body 210. For example, the wall 224 of the beam body 220 perpendicular to the height direction Z may be the bottom wall of the beam body 220, in which case the bottom wall of the beam body 220 is fixedly connected to the bottom wall of the box body 210. In other embodiments, the wall of the beam body 220 perpendicular to the first direction X may be fixedly connected to the box body 210, for example, the side wall of the beam body 220 arranged along the second direction Y is fixedly connected to the side wall of the box body 210 arranged along the second direction Y.

[0151] Optionally, the wall 224 of the beam body 220 perpendicular to the height direction Z of the box body 200 can be fixedly connected to the box body 210 by fasteners. For example, it can be fixed by riveting methods such as sealed blind rivets and sealed rivet nuts, and can also be fixed by other fixing methods such as bonding and clamping. The embodiment of the present application does not limit the fixing method of the wall 224 of the beam body 220 perpendicular to the height direction Z of the box body 200 and the box body 210.

[0152] In this embodiment, the wall 224 of the beam body 220 which is perpendicular to the height direction Z of the box body 200 is fixedly connected to the box body 210 , so as to further enhance the strength of the box body 200 .

[0153] Optionally, in the embodiment of the present application, the box body 200 may be a die-cast box body. Further, the limiting structure 230 and the box body 210 may be integrally formed by die-casting, such as Fig.10 shown.

[0154] In this embodiment, the die-cast box body has a simpler structure and process flow than the profile box body, and has high mass production efficiency. In addition, the die-cast box body forming process can be used to easily add related stop and buffer features, and the stop structure can be integrally formed while the box body is die-cast, which has high process feasibility and relatively low investment.

[0155] See again Figures 4 to 10The embodiment of the present application provides a box body 200, which includes a box body 210 and a beam body 220. The box body 210 is used to accommodate a battery cell. The beam body 220 is arranged in the box body 210. The beam body 220 includes a first side wall 222 and a second side wall 223 arranged opposite to each other along a first direction X, and the beam body 220 is provided with a first cavity 221 extending along a second direction Y. The first direction X, the second direction Y and the height direction Z of the beam body 220 are perpendicular to each other. The first side wall 222 of the beam body 220 is used to receive the expansion force from the battery cell in the first direction X. The material of the beam body 220 is a non-metal composite material. The box body 200 also includes a limiting structure 230, which is arranged between the second side wall 223 of the beam body 220 and the side wall of the box body 210 in the first direction X. The limiting structure 230 is used to support the beam body 220. The second side wall is provided with at least two glue injection holes 2301 spaced apart along the second direction Y, and the glue injection holes 2301 are used to introduce the structural glue 240 into between the limiting structure 230 and the second side wall 223. The box body 210 and the limiting structure 230 are integrally formed, and the box body 200 is a die-cast box body.

[0156] In this embodiment, by arranging the beam body 220 in the box body 210 to bear the expansion force from the battery cell, the structural deformation of the box body 200 can be effectively reduced. In addition, the beam body 220 made of non-metallic composite materials can not only play an insulating effect, but also reduce the weight of the box body 200, thereby greatly improving the energy density of the battery. In addition, along the first direction X, by arranging the limiting structure 230 between the second side wall 223 of the beam body 220 and the side wall 221 of the box body 210, the strength of the box body 200 can be enhanced while buffering the expansion force of the battery cell. Finally, the die-cast box body is adopted, the structure and process flow are simpler, and the large-scale production efficiency is high. In addition, the die-cast box body molding process itself can be used to easily add related limiting and buffering features, and the limiting structure is integrally formed while the box body is die-cast, and the process is highly executable and the investment is relatively small.

[0157] The embodiment of the present application further provides a battery, including a battery cell and a box body 200 described in the above various embodiments, the box body 200 is used to accommodate the battery cell, and the beam body 220 in the box body 200 is used to withstand the expansion force from the battery cell.

[0158] The embodiment of the present application further provides an electrical device, including a battery having a housing 200 of the various embodiments described above, and the battery is used to provide electrical energy to the electrical device.

[0159] Electrical equipment can be Figure 1 The vehicle shown may also be any device using a battery.

[0160] 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 box, characterized in that: include: box body; A beam body, arranged on the box body, the beam body is used to receive a force from a first direction, and the first direction forms a preset angle with an extension direction of the beam body; Wherein, the material of the beam body includes non-metallic composite material.

2. The box according to claim 1, characterized in that: The beam body includes a first side wall and a second side wall arranged opposite to each other along the first direction, the first side wall is used to receive the force from the first direction, and the box body also includes: A limiting structure is provided between the second side wall and the side wall of the box body along the first direction, and the limiting structure is used to support the beam body to limit the movement of the beam body in the direction toward the side wall of the box body.

3. The box according to claim 2, characterized in that: The limiting structure is fixedly connected to the second side wall.

4. The box according to claim 3, characterized in that: The limiting structure is provided with at least two glue injection holes spaced apart along the second direction, and the glue injection holes are used to introduce structural glue into between the limiting structure and the second side wall. The limiting structure and the second side wall are fixedly connected by the structural glue, and the second direction is the extension direction of the beam body.

5. The box according to claim 3, characterized in that: The limiting structure is provided with at least two rivet holes spaced apart along the second direction. The limiting structure is fixedly connected to the second side wall by rivets inserted into the rivet holes. The second direction is the extension direction of the beam body.

6. The box according to any one of claims 3 to 5, characterized in that: The limiting structure includes at least two limiting plates spaced apart along a second direction, and the second direction is an extending direction of the beam body.

7. The box according to any one of claims 3 to 5, characterized in that: The limiting structure includes a limiting strip extending along a second direction, and the second direction is an extending direction of the beam body.

8. The box according to any one of claims 3 to 5, characterized in that: The limiting structure includes at least two stoppers spaced apart along a second direction, two ends of the stoppers along the first direction respectively abut against the second side wall and the side wall of the box body, and the second direction is an extending direction of the beam body.

9. The box according to claim 8, characterized in that: The stopper includes a main body and two extension parts, wherein the two ends of the main body along the first direction respectively abut against the second side wall and the side wall of the box body, and the two extension parts respectively extend from one end of the main body abutting against the second side wall along the second direction away from the main body.

10. The box according to claim 9, characterized in that: The main body is a hollow structure.

11. The box according to claim 6, characterized in that: Notches are respectively provided at both ends of the limiting plate along the second direction, and the notches are used to introduce structural adhesive into between the limiting plate and the second side wall.

12. The box according to any one of claims 2 to 11, characterized in that: The box body and the limiting structure are integrally formed.

13. The box according to any one of claims 1 to 12, characterized in that: The box body is a die-cast box body.

14. The box according to any one of claims 1 to 13, characterized in that: The wall of the beam body which is perpendicular to the height direction of the box body is fixedly connected to the box body.

15. A battery, characterized in that: It comprises a battery cell and a box body as claimed in any one of claims 1 to 14, wherein the box body is used to accommodate the battery cell, and the beam body in the box body is used to receive the expansion force from the battery cell.

16. An electrical equipment, characterized in that: The battery as claimed in claim 15 is used to provide electrical energy to the electrical device.

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