Box body, battery and electric device

Abstract

The embodiment of the invention provides a box body, a battery and an electric device. The box body comprises a box body provided with an accommodating space with an opening, and the accommodating space is used for accommodating a single battery; the box body comprises a supporting plate and a beam body, the supporting plate is opposite to the opening, and the beam body is arranged at the end of the supporting plate; the beam body comprises a main body part and a cantilever beam which are connected, and the cantilever beam extends from the main body part to the accommodating space; the cantilever beam is fixedly connected with the supporting plate, the surface, facing the accommodating space, of the cantilever beam is flush with the surface, facing the accommodating space, of the supporting plate to form a first surface, and the first surface is used for being fixedly connected with a battery monomer. According to the box body, the battery and the power utilization device provided by the embodiment of the invention, the charging and discharging performance of the battery can be improved while the battery assembly space is not wasted.

Description

Technical Field

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

[0002] The main structure of the battery box includes a beam and a support plate. The beam is set at the end of the support plate and then assembled into a box assembly by riveting or welding. At present, the structure of the beam is relatively complex, which may cause the vibration frequency of the entire battery to be low when it is impacted, thereby affecting the battery's charge and discharge performance. Summary of the invention

[0003] In view of this, the embodiments of the present application provide a box, a battery and an electrical device, which can improve the charging and discharging performance of the battery.

[0004] In a first aspect, a box body is provided, comprising a box body, provided with a accommodating space with an opening, the accommodating space being used to accommodate a battery cell; the box body comprises a support plate and a beam body, the support plate is arranged opposite to the opening, and the beam body is arranged at the end of the support plate; the beam body comprises a connected main body and a cantilever beam, the cantilever beam extends from the main body toward the accommodating space; the cantilever beam is fixedly connected to the support plate, and the surface of the cantilever beam facing the accommodating space is flush with the surface of the support plate facing the accommodating space to form a first surface, and the first surface is used to be fixedly connected to the battery cell.

[0005] In this embodiment, since the cantilever beam is integrally arranged with the main body and the cantilever beam extends from the main body toward the accommodating space, the thickness of the beam body is increased, and the vibration frequency of the battery when impacted is improved, thereby promoting the uniform distribution of the electrolyte inside the battery and improving the charging and discharging performance of the battery; at the same time, since the cantilever beam is fixedly connected to the support plate, and the surface of the cantilever beam facing the accommodating space is flush with the surface of the support plate facing the accommodating space to form a first surface for fixed connection with the battery cell, it is beneficial to reduce the waste of battery assembly space while improving the charging and discharging performance of the battery.

[0006] In a possible implementation manner, the cantilever beam extends from the bottom wall of the main body toward the accommodating space.

[0007] In this embodiment, the cantilever beam extends from the bottom wall of the main body toward the accommodating space, which can further reduce the waste of battery assembly space.

[0008] In a possible implementation, a first matching portion is provided at the free end of the cantilever beam, and a second matching portion is provided at the end of the support plate; the first matching portion and the second matching portion match each other to form a first surface.

[0009] In this embodiment, compared with directly splicing the free end of the cantilever beam and the end of the support plate to form the first surface, the fixing surface of the cantilever beam and the support plate can be increased, and the bonding strength between the two can be enhanced.

[0010] In a possible implementation, the first matching portion and the second matching portion are both step structures.

[0011] In this embodiment, the first mating portion and the second mating portion are both configured as a step structure, which has a simple structure and is conducive to welding at the first mating portion and the second mating portion to further enhance the connection strength between the cantilever beam and the support plate.

[0012] In a possible implementation manner, the thickness of the cantilever beam is greater than the thickness of the bottom wall.

[0013] In this embodiment, the thickness of the cantilever beam is set to be greater than the thickness of the bottom wall of the main body, which can improve the supporting effect on the battery cell.

[0014] In a possible implementation manner, the cantilever beam and the support plate are fixedly connected by welding.

[0015] In this embodiment, the first matching portion of the cantilever beam and the second matching portion of the support plate are matched with each other, and the cantilever beam and the support plate are welded together, so that the bonding strength between the two can be enhanced.

[0016] In a possible implementation manner, the support plate includes a first heat management component, and a surface of the cantilever beam facing the accommodation space is flush with a surface of the first heat management component facing the accommodation space.

[0017] In this embodiment, by making the surface of the first thermal management component facing the accommodating space flush with the surface of the first thermal management component facing the accommodating space, compared with the technical solution of fixing the first thermal management component to the bottom wall of the beam body, since the first thermal management component reuses a part of the dimension of the beam body in the height direction of the box body, the dimension of the box body in the height direction can be greatly reduced.

[0018] In a possible implementation, the support plate further includes: a protective plate, which is arranged on a side of the first thermal management component away from the accommodating space; the protective plate exceeds the first thermal management component in the thickness direction of the beam body and is connected to the bottom wall of the main body.

[0019] In this embodiment, a protective plate is provided at the bottom of the first thermal management component, which can well support the battery cell on the one hand, and protect the first thermal management component on the other hand. In addition, the protective plate extends beyond the first thermal management component in the thickness direction of the beam body to be connected to the bottom wall of the main body of the beam body, which can improve the overall mechanical structure performance of the box body.

[0020] In a possible implementation, the beam body also includes: a first connecting rib connected between the first side wall of the main body and the cantilever beam, the first side wall being the side wall of the main body closer to the accommodating space in the thickness direction of the beam body; the angle between the first side wall and at least one of the cantilever beam and the first connecting rib is less than 90°.

[0021] In this embodiment, a first connecting rib is provided between the cantilever beam and the first side wall of the main body, and the angle between the first side wall and at least one of the cantilever beams is less than 90°. When the beam body is subjected to laterally extrusion, the first connecting rib can decompose the lateral extrusion force onto the cantilever beam, thereby reducing the possibility of the beam body invading the battery cell, thereby improving the lateral extrusion performance of the battery.

[0022] In a possible implementation manner, a trapezoidal cavity is formed between the first connecting rib, the cantilever beam, and the first side wall.

[0023] In this embodiment, by forming a trapezoidal cavity between the first connecting rib, the cantilever beam and the first side wall, it is possible to reduce the problem of stress concentration when the beam body is subjected to lateral compression.

[0024] In a possible implementation, the main body also includes a second side wall arranged opposite to the first side wall along the thickness direction of the beam body, at least one second connecting rib is arranged between the first side wall and the second side wall, and the at least one second connecting rib is arranged at intervals along the height direction of the box body.

[0025] In this embodiment, by providing at least one second connecting rib between the first side wall and the second side wall which are relatively arranged along the thickness direction of the beam body, the strength of the main body can be enhanced, and the purpose of crushing energy absorption can also be achieved.

[0026] In a possible implementation, at least one second connecting rib includes a third connecting rib, the third connecting rib is arranged to intersect with the first connecting rib, and an angle between the third connecting rib and the first side wall is less than 90°.

[0027] In this embodiment, by providing an inclined first connecting rib between the cantilever beam and the first side wall and intersecting with an inclined third connecting rib between the first side wall and the second side wall, the side extrusion force can be slowly decomposed downward, thereby improving the lateral extrusion performance of the battery.

[0028] In a possible implementation, the beam body further includes a mounting portion, which is disposed on a side of the main body away from the cantilever beam, and is used for fixed installation with an electrical device.

[0029] In this embodiment, by providing a mounting portion on the beam body, it is convenient to install the box body containing the battery cells to the electrical device.

[0030] In a possible implementation, the main body and the mounting portion are connected via at least one fourth connecting rib, and the at least one fourth connecting rib is arranged at intervals along a height direction of the box body.

[0031] In this embodiment, the main body and the mounting portion are connected by at least one fourth connecting rib arranged at intervals along the height direction of the box body, which can improve the connection strength between the main body and the mounting portion.

[0032] In a possible implementation manner, the thickness of at least a portion of the fourth connecting rib is greater than the thickness of the bottom wall of the main body.

[0033] In this embodiment, by increasing the thickness of at least a portion of the fourth connecting rib, the vibration frequency of the battery when it is impacted can be further increased.

[0034] In a possible implementation, at least one fourth connecting rib includes a fifth connecting rib, the fifth connecting rib is arranged to intersect with the third connecting rib, and an angle between the fifth connecting rib and the second side wall is less than 90°.

[0035] In this embodiment, a fifth connecting rib with an angle less than 90 degrees is provided between the mounting portion and the main body, and the fifth connecting rib is intersected with the third connecting rib in the main body. When the beam body is subjected to laterally extrusion, the fifth connecting rib can decompose the lateral extrusion force and transmit it downward through the third connecting rib, thereby reducing the possibility of the beam body invading the battery cell, thereby improving the lateral extrusion performance of the battery.

[0036] In a possible implementation, the box body further includes: a box cover, covering the box body, and the box cover is fixedly connected to the main body.

[0037] In this embodiment, the box cover is closed with the box body and fixedly connected with the main body, so that the battery cell can be enclosed in the accommodation space in the box body, thereby improving the performance of the battery.

[0038] In a second aspect, a battery is provided, comprising a plurality of battery cells and a box as in the first aspect and any possible implementation of the first aspect, wherein the plurality of battery cells are disposed in the box.

[0039] In this embodiment, the battery box adopts a beam structure including a main body and a cantilever beam. Since the cantilever beam is integrally arranged with the main body and extends from the main body toward the accommodating space, the thickness of the beam body is increased, and the vibration frequency of the battery when impacted is improved, thereby promoting the uniform distribution of electrolyte inside the battery and improving the charging and discharging performance of the battery. At the same time, since the cantilever beam is fixedly connected to the support plate, and the surface of the cantilever beam facing the accommodating space is flush with the surface of the support plate facing the accommodating space to form a first surface for fixed connection with the battery cell, it is beneficial to improve the charging and discharging performance of the battery while reducing the waste of battery assembly space.

[0040] In one possible implementation, the box body includes two beams arranged opposite to each other along a first direction, the first direction is perpendicular to the height direction of the box body, and the battery also includes a second thermal management component, the thermal management component is attached to the side wall of the battery cell, and the second thermal management component extends along the first direction so that the current collector of the second thermal management component is arranged in the gap formed by the main body and the battery cell in the first direction.

[0041] In this embodiment, by attaching a second thermal management component to the side wall of the battery cell, on the one hand, the thermal management performance of the battery can be improved; on the other hand, by arranging the collector of the second thermal management component in the gap formed by the battery cell and the main body in the first direction, the space occupied by the battery cell in the first direction can be reduced, thereby improving the energy density of the battery.

[0042] 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

[0043] 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.

[0044] Figure 1 is a structural schematic diagram of a vehicle disclosed in an embodiment of the present application;

[0045] Figure 2 is a schematic diagram of the structure of a battery disclosed in one embodiment of the present application;

[0046] Figure 3 is a cross-sectional view of a box disclosed in one embodiment of the present application;

[0047] Figure 4 It is a structural schematic diagram of a box disclosed in an embodiment of the present application;

[0048] Figure 5 is a cross-sectional view of a box body disclosed in another embodiment of the present application;

[0049] Figure 6 It is a cross-sectional view of a beam body disclosed in one embodiment of the present application. DETAILED DESCRIPTION

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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).

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.).

[0062] 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.

[0063] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0064] 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.).

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] In some embodiments, the electrode assembly is a laminate structure.

[0078] 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.

[0079] 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.

[0080] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded sections.

[0081] 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.

[0082] 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.

[0083] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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 bottom plate 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.

[0091] The technical solutions described in the embodiments of the present application are applicable to various devices that use batteries, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, electric vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0092] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the devices described above, but can also be applied to all devices using batteries. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0093] For example, Figure 1As shown, it is a structural schematic diagram 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 arranged 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 arranged 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.

[0094] In order to meet different power usage requirements, the battery may include multiple different types of battery cells, for example, battery cells with different safety characteristics. The multiple battery cells may be connected in series, in parallel or in a mixed manner according to the type of the battery cells to form multiple battery cell groups, and the multiple battery cell groups are then connected in series to form a battery, wherein the mixed connection may be a mixture of series and parallel connections. The multiple different battery cells may also be directly connected in series, in parallel or in a mixed manner to form a battery. In other words, multiple battery cells may be directly formed into a battery, or may be first formed into a battery cell group according to the type of the battery cells, and then the battery cell group may be formed into a battery.

[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 housing 200 (or housing). The housing 200 is a hollow structure, and the plurality of battery cells are accommodated in the housing 200. Figure 2 As shown, the box body 200 may include two parts, which are respectively referred to as a box body 210 and a box cover 220, and the box body 210 and the box cover 220 are buckled together. The shapes of the box body 210 and the box cover 220 may be determined according to the shapes of the combination of multiple battery cells.

[0096] In some embodiments, the box body 210 and the box cover 220 may each have an opening. For example, the box body 210 and the box cover 220 may both be hollow cuboids and each have only one open face, the openings of the box body 210 and the box cover 220 are arranged opposite to each other, and the box body 210 and the box cover 220 are buckled together to form a box with a closed chamber. A plurality of battery cells are connected in parallel, in series, or in a mixed combination and placed in the box formed by the box body 210 and the box cover 220 being buckled together.

[0097] The box body 210 generally includes a support plate and a beam assembly. The support plate is used to support the battery cell. The beam assembly is arranged around the battery cell to form a receiving space with the support plate. The beam in the beam assembly and the support plate are assembled into the box body 210 by riveting or welding.

[0098] Figure 3 Shows Figure 2 A cross-sectional view of the battery 100 along CC'. Figure 3 As shown, the beam body 30 mainly includes a battery mounting portion 31, a box assembly portion 32 and an electric device mounting portion 33, wherein the box assembly portion 32 is used to form the frame of the box 200, and can provide mounting points for the support plate 300 and the box cover 220, the battery mounting portion 31 is used to provide mounting points for the battery cell 20, and the electric device mounting portion 33 is used to provide mounting points for assembly to the electric device, and the mounting points of the electric device mounting portion 33 can also be called mounting points. The number of mounting points is reasonably arranged and designed according to the mechanical performance simulation requirements.

[0099] from Figure 3 It can be seen that the battery cell 20 is arranged on the support plate 300 and is fixedly connected to the battery mounting portion 31 through the end plate 21 located at the end of the battery cell 20. The battery mounting portion 31 is a hollow structure. In order to avoid occupying too much battery assembly space, the battery mounting portion 31 is usually narrow. The narrower the beam body 30, the lower the vibration frequency of the battery 100 when it is impacted, and the lower vibration frequency may reduce the charging and discharging performance of the battery.

[0100] Therefore, an embodiment of the present application provides a box body, which is designed with a beam body, including an integrally formed cantilever beam and a main body, the cantilever beam is fixedly connected to the support plate, and the surface of the cantilever beam facing the accommodating space is flush with the surface of the support plate facing the accommodating space to form a first surface for fixed connection with the battery cell, which can increase the vibration frequency of the battery when it is impacted without occupying too much battery assembly space, thereby promoting the uniform distribution of electrolyte inside the battery and improving the charging and discharging performance of the battery.

[0101] Figure 4 A schematic structural diagram of a box body 200 according to an embodiment of the present application is shown. Figure 5 Shows Figure 4 A cross-sectional view of the box body 200 (including the battery cell) along BB'. Figure 4 and Figure 5As shown, the box body 200 includes: a box body 210, which is provided with a accommodating space 212 with an opening 211, and the accommodating space is used to accommodate a battery cell 20; the box body 210 includes a support plate 300 and a beam body 400, the support plate 300 is arranged opposite to the opening 211, and the beam body 400 is arranged at the end of the support plate 300; the beam body 400 includes a connected main body 410 and a cantilever beam 420, and the cantilever beam 420 extends from the main body 410 toward the accommodating space; the cantilever beam 420 is fixedly connected to the support plate 300, and the surface of the cantilever beam 420 facing the accommodating space 212 is flush with the surface of the support plate 300 facing the accommodating space 212 to form a first surface 201, and the first surface 201 is used to be fixedly connected to the battery cell.

[0102] First, it should be noted that the support plate 300 is usually disposed at the bottom of the battery cell 20 to support the battery cell 20. The beam 400 can be understood as a side beam of the box body 200, which is disposed at the end or edge of the support plate 300 and is disposed around the battery cell 20. In addition, the box body 200 may also include other beams, such as expansion beams, which are disposed inside the accommodating space 212 to divide the accommodating space 212 into a plurality of subspaces.

[0103] Secondly, the cantilever beam 420 in the embodiment of the present application is a plate-like structure. The cantilever beam 420 extends from the main body 410 toward the accommodating space 212. It can be understood that the cantilever beam 420 extends from the entire main body 410 toward the accommodating space 212 along the thickness direction A of the beam body 400. One end of the cantilever beam 420 in the thickness direction A of the beam body 400 is a fixed end fixedly connected to the main body 410, and the other end in the thickness direction A of the beam body 400 is a free end. In addition, the cantilever beam 420 and the main body 410 can be arranged to intersect. For example, the cantilever beam 420 and the main body 410 can be arranged vertically. Usually, the beam body 400 can be regarded as a narrow and long strip structure that is roughly a rectangular parallelepiped, wherein the height direction of the beam body 400 is the same as the direction of gravity, which can also be understood as the height direction Z of the box body 200, and the extension direction of the beam body 400 can be understood as the length direction of the beam body 400. The other direction, that is, the direction perpendicular to both the height direction and the length direction of the beam body 400, is the thickness direction A of the beam body 400, which can also be called the width direction A of the beam body 400.

[0104] Again, after the cantilever beam 420 is fixedly connected to the support plate 300, the surface of the cantilever beam 420 facing the accommodation space 212 and the surface of the support plate 300 facing the accommodation space 212 should be flush, and spliced ​​to form the first surface 201. In other words, the first surface 201 includes a portion extending from the surface of the support plate 300 facing the opening 211 to the surface of the cantilever beam 420 facing the opening 211. The battery cell 20 can be fixed on the first surface 201. For example, the surface of the battery cell 20 can be fixedly connected to the first surface 201 by bonding.

[0105] Finally, the beam body 400 in the embodiment of the present application can be Figure 4 The beam body arranged along the length direction X of the box body 200 shown in the figure may also be Figure 4 The beam body is arranged along the width direction Y of the box body 200. In some embodiments, Figure 4 The four beams shown can all adopt the technical solution of the beam 400 in the embodiment of the present application. Figure 4 When the beam body 400 is arranged along the length direction X of the box body 200, the thickness direction A of the beam body 400 is the width direction Y of the box body 200. Figure 4 When the beam body 400 is arranged along the width direction Y of the box body 200 as shown, the thickness direction A of the beam body 400 is the length direction X of the box body 200 .

[0106] In this embodiment, since the cantilever beam 420 is integrally arranged with the main body 410 and the cantilever beam 420 extends from the main body 410 toward the accommodating space 212, the thickness of the beam body 400 is increased, and the vibration frequency of the battery when impacted is improved, thereby promoting the uniform distribution of the electrolyte inside the battery and improving the charging and discharging performance of the battery; at the same time, since the cantilever beam 420 is fixedly connected to the support plate 300, and the surface of the cantilever beam 420 facing the accommodating space 212 is flush with the surface of the support plate 300 facing the accommodating space 212 to form a first surface 201 for fixed connection with the battery cell 20, it is beneficial to reduce the waste of battery assembly space while improving the charging and discharging performance of the battery.

[0107] Alternatively, if Figure 5 As shown, the cantilever beam 420 extends from the bottom wall 415 of the main body 410 toward the accommodation space 212. In this way, the cantilever beam 420 is fixedly connected to the support plate 300, so that the accommodation space 212 forms an integral body in the height direction Z of the box body 200, and the battery cell 20 is located in the accommodation space above the first surface 201 formed by the cantilever beam 420 and the support plate 300.

[0108] In this embodiment, the cantilever beam 420 extends from the bottom wall 415 of the main body 410 toward the receiving space 212, which can further reduce the waste of battery assembly space.

[0109] In other embodiments, the cantilever beam 420 extends from the middle position of the main body 410 in the height direction Z of the box body 200 toward the accommodating space 212, so that the fixed connection between the cantilever beam 420 and the support plate 300 forms both a first surface 201 facing the accommodating space 212 and a second surface away from the accommodating space 212, and the first surface 201 and the second surface are both used to fix the battery cell 20. That is, the accommodating space 212 is divided into two subspaces in the height direction Z of the box body 200, and the two subspaces are both used to accommodate the battery cell 20.

[0110] In this case, the embodiment of the present application should not limit the number of cantilever beams 420, that is, multiple cantilever beams 420 can extend from different positions of the main body 410 in the height direction Z toward the accommodating space 212, so that the accommodating space 212 can be divided in the height direction Z into multiple sub-spaces for accommodating battery cells 20.

[0111] Continue to see Figure 5 The free end of the cantilever beam 420 is provided with a first matching portion 421, and the end of the support plate 300 is provided with a second matching portion 301; the first matching portion 421 and the second matching portion 301 cooperate with each other to form a first surface 201. In this embodiment, compared with directly splicing the free end of the cantilever beam 420 and the end of the support plate 300 to form the first surface 201, the fixing surface of the cantilever beam 420 and the support plate 300 can be increased, and the bonding strength between the two can be enhanced.

[0112] For example, if the cantilever beam 420 and the support plate 300 are fixedly connected by welding, in the direct splicing scheme, the welding area only includes the area of ​​the end of the support plate 300 or the cantilever beam 420 in the vertical direction (this area is fixed), and if both the cantilever beam 420 and the support plate 300 are provided with a matching part, the welding area can include both the area of ​​the end of the support plate 300 or the cantilever beam 420 in the vertical direction and the area of ​​the edge of the support plate 300 or the cantilever beam 420 in the horizontal direction. By increasing the welding area in the horizontal direction, the entire welding area of ​​the cantilever beam 420 and the support plate 300 can be increased, making the welding more reliable.

[0113] Optionally, the first matching portion 421 and the second matching portion 301 are both step structures. Figure 5 As shown, the step notch of the first matching portion 421 faces downward, that is, the first matching portion 421 is an inverted step, and the step notch of the second matching portion 301 faces upward, that is, the second matching portion 301 is a positive step.

[0114] In other examples, the first matching portion 421 is a positive step, and the second matching portion 301 is a negative step.

[0115] In this embodiment, the first mating portion 421 and the second mating portion 301 are both set to a step structure, which has a simple structure and is conducive to welding at the first mating portion 421 and the second mating portion 301 to further strengthen the connection strength between the cantilever beam 420 and the support plate 300.

[0116] Further, the cantilever beam 420 and the support plate 300 are fixedly connected by welding. For example, the cantilever beam 420 and the support plate 300 are fixedly connected by friction stir welding (FSW). For another example, the cantilever beam 420 and the support plate 300 are fixedly connected by laser welding or ultrasonic welding. It should be understood that the embodiment of the present application does not limit the type of welding.

[0117] In this embodiment, the first matching portion 421 of the cantilever beam 420 and the second matching portion 301 of the support plate 300 are matched with each other, and the cantilever beam 420 and the support plate 300 are welded together, so that the bonding strength between the two can be enhanced.

[0118] In other embodiments, the first matching portion 421 and the second matching portion 301 may also be a snap-fit ​​structure. After the first matching portion 421 and the second matching portion 301 are snap-fitted, the cantilever beam 420 and the support plate 300 cannot move relative to each other along the thickness direction A of the beam body 400 .

[0119] like Figure 6 As shown, the thickness H1 of the cantilever beam 420 is greater than the thickness H2 of the bottom wall 415 of the main body 410 .

[0120] In this embodiment, the thickness H1 of the cantilever beam 420 is set to be greater than the thickness H2 of the bottom wall 415 of the main body 410 , which can improve the supporting effect on the battery cell 20 .

[0121] like Figure 5 As shown, the support plate 300 includes the first heat management component 310 , and the surface of the cantilever beam 420 facing the receiving space 212 is flush with the surface of the first heat management component 310 facing the receiving space 212 .

[0122] Typically, a thermal management component can contain liquid or gas for heating or cooling a battery cell. In the case of cooling or lowering the temperature of a battery cell, the thermal management component is used to contain a cooling fluid to lower the temperature of multiple battery cells. At this time, the thermal management component may also be referred to as a cooling component, a cooling system, or a cooling plate, etc., and the fluid contained therein may also be referred to as a cooling medium or a cooling fluid, more specifically, a coolant or a cooling gas. Optionally, the above fluid may be circulating to achieve a better temperature regulation effect. Optionally, the fluid may be water, a mixture of water and ethylene glycol, or air, etc.

[0123] The thermal management component can usually be arranged at the bottom of the battery cell, or at the top of the battery cell or at the side of the battery cell. When the thermal management component is arranged at the bottom of the battery cell, the thermal management component and the beam body are usually stacked in the height direction of the box body, that is, the thermal management component is fixed to the bottom wall of the beam body. In this embodiment, by making the surface of the first thermal management component 310 facing the accommodating space 212 flush with the surface of the cantilever beam 420 of the beam body 400 facing the accommodating space 212, the first thermal management component 310 reuses a part of the size of the beam body 400 in the height direction Z of the box body 200, thereby greatly reducing the size of the box body 200 in the height direction Z.

[0124] Continue to see Figure 5 The support plate 300 also includes: a protective plate 320, which is arranged on a side of the first thermal management component 310 away from the accommodating space 212, and the protective plate 320 exceeds the first thermal management component 310 in the thickness direction A of the beam body 400, and is connected to the bottom wall 415 of the main body 410 of the beam body 400.

[0125] In this embodiment, a protective plate 320 is provided at the bottom of the first thermal management component 310, which can well support the battery cell 20 on the one hand, and protect the first thermal management component 310 on the other hand. In addition, the protective plate 320 exceeds the first thermal management component 310 in the thickness direction A of the beam body 400 to be connected to the bottom wall 415 of the main body 410 of the beam body 400, which can improve the overall mechanical structure performance of the box body 200.

[0126] In some embodiments, the protection plate 320 is fixedly connected to the first thermal management component 310 , for example, the two are fixedly connected by snapping or gluing.

[0127] Optionally, in the embodiment of the present application, the protective plate 320 and the bottom wall 415 of the main body 410 can be fixedly connected by flow drill screw (FDS), friction stir welding (FSW) or bolts.

[0128] In other embodiments, the protective plate 320 exceeds the first thermal management component 310 in the thickness direction A of the beam body 400, and in the thickness direction A of the beam body 400, the first thermal management component 310 and the end of the protective plate 320 form a Figure 5 As shown in the second matching portion 301 , at this time, the protective plate 320 does not need to be fixedly connected to the main body 410 .

[0129] In other embodiments, a flow channel may be provided in the protective plate 320 so that the protective plate 320 can both support the battery cell 20 and adjust the temperature of the battery cell 20. In this case, a flow channel may be provided directly at the end of the protective plate 320. Figure 5 The second matching portion 301 shown does not require the first thermal management component 310 , which reduces the difficulty of assembling the box body 200 .

[0130] like Figure 6 As shown, the beam body 400 also includes: a first connecting rib 430 connected between the first side wall 411 of the main body 410 and the cantilever beam 420, the first side wall 411 is a side wall of the main body 410 that is closer to the accommodating space 212 in the thickness direction A of the beam body 400, and the angle α between the first side wall 411 and at least one of the cantilever beam 420 and the first connecting rib 430 is less than 90°.

[0131] In this embodiment, a first connecting rib 430 is provided between the cantilever beam 420 and the first side wall 411 of the main body 410, and the angle between the first side wall and at least one of the cantilever beam 420 is less than 90°. When the beam body 400 is subjected to lateral extrusion, the first connecting rib 430 can decompose the lateral extrusion force onto the cantilever beam 420, thereby reducing the possibility of the beam body invading the battery cell 20, thereby improving the lateral extrusion performance of the battery.

[0132] Optionally, the thickness of the first connecting rib 430 may be greater than or equal to 2 mm.

[0133] In one example, the first connecting rib 430 is a straight rib, that is, a non-bending structure, and the angles between the first connecting rib 430 and the first side wall 411 and the cantilever beam 420 are all less than 90°, and a triangular cavity is formed between the first connecting rib 430 and the first side wall 411 and the cantilever beam 420.

[0134] In another example, the first connecting rib 430 can be a bent structure, and a trapezoidal cavity 440 is formed between the first connecting rib 430, the cantilever beam 420 and the first side wall 411. In this case, the portion of the first connecting rib 430 connected to the first side wall 411 and the portion of the first connecting rib 430 connected to the cantilever beam 420 have an angle less than 90°.

[0135] Alternatively, if Figure 6 As shown, the included angle between the first connecting rib 430 and the first side wall 411 is less than 90°, and the included angle between the first connecting rib 430 and the cantilever beam 420 is equal to 90°.

[0136] Optionally, the included angle between the first connecting rib 430 and the first side wall 411 is equal to 90°, but the included angle between the first connecting rib 430 and the cantilever beam 420 is less than 90°.

[0137] In other embodiments, an irregular trapezoidal cavity is formed between the first connecting rib 430 , the cantilever beam 420 and the first side wall 411 .

[0138] In this embodiment, by forming a trapezoidal cavity 440 between the first connecting rib 430 , the cantilever beam 420 and the first side wall 411 , it is possible to prevent stress concentration from occurring when the beam body 400 is subjected to lateral compression.

[0139] Alternatively, if Figure 6 As shown, the main body 410 of the beam body 400 has a cavity 414 , so as to reduce the weight of the beam body 400 and further reduce the weight of the box body 200 .

[0140] In some embodiments, Figure 6 As shown, the main body 410 also includes a second side wall 412 arranged opposite to the first side wall 411 along the thickness direction A of the beam body 400, at least one second connecting rib 413 is arranged between the first side wall 411 and the second side wall 412, and at least one second connecting rib 413 is arranged at intervals along the height direction Z of the box body 200.

[0141] Optionally, the second connection rib 413 may be arranged parallel to the bottom wall 415 of the main body 410 , or may be arranged obliquely.

[0142] Optionally, the thickness of the second connecting rib 413 may be greater than or equal to 1.2 mm.

[0143] In this embodiment, by providing at least one second connecting rib 413 between the first side wall 411 and the second side wall 412 which are relatively arranged along the thickness direction A of the beam body 400 , the strength of the main body 410 can be enhanced, and the purpose of crushing energy absorption can also be achieved.

[0144] See also Figure 6 At least one second connecting rib 413 may include a third connecting rib 4131, which is arranged to intersect with the first connecting rib 430, and an angle β between the third connecting rib 4131 and the first side wall 411 is less than 90°.

[0145] For example, the first connecting rib 430 and the third connecting rib 4131 are both connected to the first side wall 411 at the same height in the height direction Z of the box body 200 .

[0146] In this embodiment, by providing an inclined first connecting rib 430 between the cantilever beam 420 and the first side wall 411 and intersecting with an inclined third connecting rib 4131 between the first side wall 411 and the second side wall 412, the side extrusion force can be slowly decomposed downward, thereby improving the lateral extrusion performance of the battery.

[0147] In some embodiments, the third connecting rib 4131 is intersected with the first connecting rib 430 , the angle β between the third connecting rib 4131 and the first side wall 411 is less than 90°, and the angle α between the first connecting rib 430 and the first side wall 411 is less than 90°.

[0148] Optionally, an angle β between the third connecting rib 4131 and the first side wall 411 may be greater than an angle α between the first connecting rib 430 and the first side wall 411 .

[0149] Alternatively, see Figure 6 In the height direction Z of the box body 200, the third connecting rib 4131 is inclined from the first side wall 411 toward the direction away from the bottom wall 415 of the main body 410. In other words, the connection between the third connecting rib 4131 and the second side wall 412 is higher than the connection between the third connecting rib 4131 and the first side wall 411 in the height direction Z.

[0150] In other embodiments, in the height direction Z of the box body 200 , the third connecting rib 4131 is inclined from the first side wall 411 toward the bottom wall 415 close to the main body 410 .

[0151] Alternatively, if Figure 6 As shown, the beam body 400 may further include a mounting portion 450 , which is disposed on a side of the main body 410 away from the cantilever beam 420 , and the mounting portion 450 is used for fixed installation with an electrical device.

[0152] When the battery is applied to an electrical device, the beam 400 can provide a mounting point for fixing the electrical device, and the mounting portion 450 can provide the mounting point, also called a mounting point. The number of mounting points is reasonably arranged and designed according to the mechanical performance simulation requirements. For a description of the mounting portion 450, please refer to Figure 3 The electrical device installation part 33 in the figure is not described in detail here for the sake of brevity.

[0153] In this embodiment, by providing the mounting portion 450 on the beam body 400 , it is convenient to install the box body 200 containing the battery cells 20 to the electrical device.

[0154] In some embodiments, Figure 6 As shown, the main body 410 and the mounting portion 450 are connected via at least one fourth connecting rib 460 , and the at least one fourth connecting rib 460 is arranged at intervals along the height direction Z of the box body 200 .

[0155] Optionally, the at least one fourth connecting rib 460 may be disposed in parallel with the bottom wall 415 of the main body 410. The number of the at least one fourth connecting rib 460 may be determined according to the size of the mounting portion 450 in the height direction Z of the box body 200.

[0156] In this embodiment, the main body 410 and the mounting portion 450 are connected by at least one fourth connecting rib 460 spaced apart along the height direction Z of the box body 200 , which can improve the connection strength between the main body 410 and the mounting portion 450 .

[0157] Alternatively, if Figure 6 As shown, the thickness H3 of at least a portion of the fourth connecting rib 460 is greater than the thickness H2 of the bottom wall 415 of the main body 410. In some embodiments, the thickness H2 of the bottom wall 415 of the main body 410 is greater than or equal to 1.5 mm, and the thickness H3 of at least a portion of the fourth connecting rib 460 is greater than or equal to 2.5 mm. For example, H2 = 1.8 mm, H3 = 3.5 mm.

[0158] In this embodiment, by increasing the thickness of at least a portion of the fourth connecting rib 460 , the vibration frequency of the battery when it is impacted can be further increased.

[0159] Alternatively, if Figure 6 As shown, the at least one fourth connecting rib 460 includes a fifth connecting rib 461 , the fifth connecting rib 461 is arranged to intersect with the third connecting rib 4131 , and an angle γ between the fifth connecting rib 461 and the second side wall 412 is less than 90°.

[0160] In this embodiment, a fifth connecting rib 461 with an angle less than 90 degrees is provided between the mounting portion 450 and the main body 410, and the fifth connecting rib 461 is intersected with the third connecting rib 4131 in the main body 410. When the beam body 400 is subjected to lateral extrusion, the fifth connecting rib 461 can decompose the lateral extrusion force and transmit it downward through the third connecting rib 4131, thereby reducing the possibility of the beam body invading the battery cell 20, thereby improving the lateral extrusion performance of the battery.

[0161] Alternatively, if Figure 5 As shown, the box body 200 further includes: a box cover 220 , which covers the box body 210 , and the box cover 220 is fixedly connected to the main body 410 .

[0162] The description of the box cover 220 can refer to Figure 2 For the sake of brevity, the description of the box cover 220 is not repeated here.

[0163] In this embodiment, the box cover 220 covers the box body 210 and is fixedly connected to the main body 410 , so that the battery cell 20 can be enclosed in the accommodation space 212 in the box body 200 , thereby improving the performance of the battery.

[0164] It should be noted that the thickness of each wall and connecting rib in the beam body 400 can be designed based on empirical values, and can also be selected in combination with actual simulation results and materials. The design can be flexibly fluctuated within a certain range. The embodiment of the present application does not limit the thickness of each wall and connecting rib in the beam body 400.

[0165] See also Figures 4 to 6The embodiment of the present application provides a box body 200, including a box body 210, provided with a storage space 212 with an opening 211, the storage space 212 is used to store a battery cell 20; wherein the box body 210 includes a support plate 300 and a beam body 400, the support plate 300 is arranged opposite to the opening 211, the support plate 300 includes a first thermal management component 310 and a protective plate 320 arranged on a side of the first thermal management component 310 away from the storage space 212, and the beam body 400 is arranged at the end of the support plate 300; the beam body 400 includes a main body 410 and a cantilever beam 420 connected to each other, the cantilever beam 420 extends from the bottom wall 415 of the main body 410 toward the storage space 212; The free end of the arm beam 420 is provided with a first mating portion 421, and the end of the first thermal management component 310 is provided with a second mating portion 301. Both the first mating portion 421 and the second mating portion 301 are step structures, and the first mating portion 421 and the second mating portion 301 are fixedly connected by FSW, and the surface of the first thermal management component 310 facing the accommodating space 212 is flush with the surface of the cantilever beam 420 facing the accommodating space 212 to form a first surface 201, which is used to be fixedly connected with the battery cell 20. The protective plate 320 exceeds the first thermal management component 310 in the thickness direction A of the beam body 400 and is connected to the bottom wall 415 of the main body 410. A first connecting rib 430 having an angle less than 90° with the first side wall 411 is provided between the first side wall 411 of the main body 410 and the cantilever beam 420, and is connected between the first side wall 411 and the cantilever beam 420. A third connecting rib 4131 having an angle less than 90° with the first side wall 411 is connected between the first side wall 411 and the second side wall 412 of the main body 410, and the third connecting rib 4131 is arranged to intersect with the first connecting rib 430. The beam body 400 further includes a mounting portion 450, and a fifth connecting rib 461 having an angle less than 90° with the second side wall 412 is connected between the main body 410 and the mounting portion 450, and a second thermal management component 500 is arranged between the battery cell 20 and the main body 410 in the thickness direction A of the beam body 400, and the box body 200 further includes a box cover 220, which covers the box body 210 and is fixedly connected to the main body 410.

[0166] In this embodiment, since the cantilever beam 420 is integrally arranged with the main body 410 and the cantilever beam 420 extends from the main body 410 toward the accommodating space 212, the thickness of the beam body 400 is increased, and the vibration frequency of the battery when impacted is improved, thereby promoting the uniform distribution of the electrolyte inside the battery and improving the charging and discharging performance of the battery; at the same time, since the cantilever beam 420 is fixedly connected to the support plate 300, and the surface of the cantilever beam 420 facing the accommodating space 212 is flush with the surface of the support plate 300 facing the accommodating space 212 to form a first surface 201 for fixed connection with the battery cell 20, it is beneficial to reduce the waste of battery assembly space while improving the charging and discharging performance of the battery. In addition, by providing an inclined first connecting rib 430 between the cantilever beam 420 and the first side wall 411 and an inclined fifth connecting rib 461 between the mounting portion 450 and the main body 410, and respectively intersecting with the inclined third connecting rib 4131 between the first side wall 411 and the second side wall 412, when the beam body 400 is subjected to lateral extrusion, the fifth connecting rib 461 can decompose the lateral extrusion force to the cantilever beam 420 through the third connecting rib 4131 and the first connecting rib 430, thereby reducing the possibility of the beam body invading the battery cell 20, thereby improving the lateral extrusion performance of the battery.

[0167] The embodiment of the present application further provides a battery, including a battery cell 20 and a box body 200 as described in the above various embodiments.

[0168] Optionally, the box body 200 is used to accommodate the battery cells 20 .

[0169] In some embodiments, the box body 200 includes two beam bodies 400 arranged opposite to each other along a first direction, the first direction is perpendicular to the height direction Z of the box body 200, and the battery also includes a second thermal management component 500, the thermal management component 500 is attached to the side wall of the battery cell 20, and the second thermal management component 500 extends along the first direction so that the collector 510 of the second thermal management component 500 is arranged in the gap formed by the main body 410 and the battery cell 20 in the first direction.

[0170] For example, Figure 4 As shown, the multiple battery cells 20 in the box body 200 are arranged in an array, the two beams 400 are arranged opposite to each other along the width direction Y of the box body 200, and the second thermal management component 500 also extends along the width direction Y of the box body 200. A gap is formed in the width direction Y of the box body 200 between a row of battery cells 20 that is closest to the main body 410 of one of the beams 400 and the main body 410 of the beam 400. Figure 5 As shown, the current collector 510 of the second heat-management component 500 may be disposed within the interval.

[0171] In this embodiment, by attaching the second thermal management component 500 to the side wall of the battery cell 20, on the one hand, the thermal management performance of the battery can be improved; on the other hand, the collector 510 of the second thermal management component 500 is arranged in the interval formed by the battery cell 20 and the main body 410 in the first direction, which can reduce the space occupied by the battery cell 20 in the first direction and improve the energy density of the battery.

[0172] 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.

[0173] The electrical device can be Figure 1 The vehicle shown may also be any device using a battery.

[0174] 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: A box body (210) is provided with a receiving space (212) having an opening (211), wherein the receiving space (212) is used to receive a battery cell (20); The box body (210) comprises a support plate (300) and a beam body (400), the support plate (300) is arranged opposite to the opening (211), and the beam body (400) is arranged at the end of the support plate (300); The beam body (400) comprises a main body portion (410) and a cantilever beam (420) connected to each other, and the cantilever beam (420) extends from the main body portion (410) toward the accommodating space (212); The cantilever beam (420) is fixedly connected to the support plate (300), and a surface of the cantilever beam (420) facing the accommodating space (212) is flush with a surface of the support plate (300) facing the accommodating space (212), so as to form a first surface (201), and the first surface (201) is used for fixedly connecting to the battery cell (20).

2. The box according to claim 1, characterized in that: The cantilever beam (420) extends from the bottom wall (415) of the main body (410) toward the accommodating space (212).

3. The box according to claim 2, characterized in that: The free end of the cantilever beam (420) is provided with a first matching portion (421), and the end of the support plate (300) is provided with a second matching portion (301); The first matching portion (421) and the second matching portion (301) match each other to form the first surface (201).

4. The box according to claim 3, characterized in that: The first matching portion (421) and the second matching portion (301) are both step structures.

5. The box according to any one of claims 2 to 4, characterized in that: The thickness of the cantilever beam (420) is greater than the thickness of the bottom wall (415).

6. The box according to any one of claims 1 to 5, characterized in that: The cantilever beam (420) and the support plate (300) are fixedly connected by welding.

7. The box according to any one of claims 1 to 6, characterized in that: The support plate (300) comprises a first heat management component (310), and a surface of the cantilever beam (420) facing the accommodation space (212) is flush with a surface of the first heat management component (310) facing the accommodation space (212).

8. The box according to claim 7, characterized in that: The support plate (300) further comprises: a protective plate (320) disposed on a side of the first heat management component (310) away from the accommodating space (212); The protection plate (320) exceeds the first heat management component (310) in the thickness direction (A) of the beam body (400) and is connected to the bottom wall (415) of the main body (410).

9. The box according to any one of claims 1 to 8, characterized in that: The beam body (400) further includes: a first connecting rib (430) connected between a first side wall (411) of the main body (410) and the cantilever beam (420), wherein the first side wall (411) is a side wall of the main body (410) closer to the accommodating space (212) in a thickness direction (A) of the beam body (400); An angle between at least one of the first side wall (411) and the cantilever beam (420) and the first connecting rib (430) is less than 90°.

10. The box according to claim 9, characterized in that: A trapezoidal cavity is formed between the first connecting rib (430), the cantilever beam (420) and the first side wall (411).

11. The box according to claim 9 or 10, characterized in that: The main body (410) further comprises a second side wall (412) arranged opposite to the first side wall (411) along the thickness direction (A) of the beam body (400), at least one second connecting rib (413) being arranged between the first side wall (411) and the second side wall (412), and the at least one second connecting rib (413) being arranged at intervals along the height direction (Z) of the box body (200).

12. The box according to claim 11, characterized in that: The at least one second connecting rib (413) includes a third connecting rib (4131), the third connecting rib (4131) is arranged to intersect with the first connecting rib (430), and the angle between the third connecting rib (4131) and the first side wall (411) is less than 90°.

13. The box according to claim 12, characterized in that: The beam body (400) further comprises a mounting portion (450), the mounting portion being arranged on a side of the main body (410) away from the cantilever beam (420), and the mounting portion (450) being used for being fixedly mounted on an electrical device.

14. The box according to claim 13, characterized in that: The main body (410) and the mounting portion (450) are connected via at least one fourth connecting rib (460), and the at least one fourth connecting rib (460) is arranged at intervals along the height direction (Z).

15. The box according to claim 14, characterized in that: The thickness of at least a portion of the fourth connecting rib (460) is greater than the thickness of the bottom wall (415) of the main body (410).

16. The box according to claim 14 or 15, characterized in that: The at least one fourth connecting rib (460) includes a fifth connecting rib (461), the fifth connecting rib (461) is arranged to intersect with the third connecting rib (4131), and the angle between the fifth connecting rib (461) and the second side wall (412) is less than 90°.

17. The box according to any one of claims 1 to 16, characterized in that: The box also includes: The box cover (220) covers the box body (210), and the box cover (220) is fixedly connected to the main body (410).

18. A battery, characterized in that: It comprises a battery cell (20) and a casing (200) according to any one of claims 1 to 17, wherein the battery cell (20) is arranged in the casing (200).

19. The battery according to claim 18, characterized in that The box body (200) comprises two beam bodies (400) arranged opposite to each other along a first direction, wherein the first direction is perpendicular to a height direction (Z) of the box body (200), and the battery further comprises: A second thermal management component (500) is attached to the side wall of the battery cell (20), and the second thermal management component (500) extends along the first direction so that the current collector (510) of the second thermal management component (500) is arranged in the interval formed between the main body (410) and the battery cell (20) in the first direction.

20. An electrical device, characterized in that: The battery as claimed in claim 19 is used to provide electrical energy to the electrical device.

Images