A battery pack and an electric device

Abstract

This application discloses a battery pack and an electrical device. The battery pack includes a base plate, an anti-expansion beam, a reinforcing member, and a battery module. The anti-expansion beam is disposed on both sides of the base plate along a first direction and is fixedly connected to the base plate. The reinforcing member is disposed on both sides of the base plate along a second direction and is fixedly connected to the base plate. The reinforcing member is connected to the anti-expansion beam on both sides along the first direction, so that the anti-expansion beam and the reinforcing member enclose a space to accommodate the battery module. The height of the reinforcing member along a third direction is less than the height of the anti-expansion beam. The reinforcing member has a porous structure, and the porosity of the reinforcing member is greater than the porosity of the anti-expansion beam and / or the base plate. Compared with related technologies, the reinforcing member replaces the side plate in the second direction of the battery pack. While satisfying structural stability, the height of the reinforcing member is lower, saving some space in the second direction of the battery pack. At the same time, the porous structure of the reinforcing member makes the weight of the reinforcing member lighter, thereby reducing the overall weight of the battery pack.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery pack and an electrical device. Background Technology

[0002] Battery packs are the core energy storage units in electric vehicles, energy storage systems, and other fields. They are formed by integrating multiple battery modules, housings, and battery management systems. Among them, the housing of the battery pack is a key component that protects the safety and stability of the battery modules and needs to meet requirements such as mechanical strength, lightweight design, thermal management, and sealing.

[0003] In related technologies, the battery pack casing generally includes an upper cover and a lower casing, with the lower casing being a closed structure on all four sides. However, such a structure increases the overall weight of the battery pack, which is not conducive to the lightweight design of the battery pack. Utility Model Content

[0004] This application aims to provide a battery pack and electrical device that can solve the problem in related technologies where the lower casing of the battery pack is a closed structure on all four sides, but such a structure increases the overall weight of the battery pack and is not conducive to the lightweight design of the battery pack.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, embodiments of this application propose a battery pack having intersecting first, second, and third directions. The battery pack includes: a base plate; anti-expansion beams, which are disposed on both sides of the base plate along the first direction and are fixedly connected to the base plate; reinforcing members, which are disposed on both sides of the base plate along the second direction and are fixedly connected to the base plate, and are respectively connected to the anti-expansion beams along both sides of the first direction, so that the anti-expansion beams and the reinforcing members enclose an accommodating space; and a battery module disposed within the accommodating space; wherein, along the third direction, the height of the reinforcing member is less than the height of the anti-expansion beam; the reinforcing member has a porous structure, and the porosity of the reinforcing member is greater than the porosity of the anti-expansion beam; and / or, the porosity of the reinforcing member is greater than the porosity of the base plate.

[0007] Optionally, the reinforcing member includes a housing and a core disposed within the housing; a cavity is formed in the core, the housing is fixedly connected to the base plate, and the housing is also connected to the anti-expansion beam.

[0008] Optionally, the outer shell includes a first inner wall and a second inner wall, the first inner wall and the second inner wall being spaced apart along the second direction, and the core being disposed between the first inner wall and the second inner wall.

[0009] Optionally, the cross-section of the cavity along the third direction is at least one of hexagonal, pentagonal, quadrilateral, and triangular.

[0010] Optionally, along the third direction, the height of the reinforcing member is H1, and the height of the anti-expansion beam is H2, satisfying: 0.25≤H1 / H2≤0.75.

[0011] Optionally, the battery pack further includes a first side plate and a second side plate, the first side plate and the second side plate being spaced apart along the first direction, and both the first side plate and the second side plate being fixedly connected to the base plate; the first side plate and the adjacent anti-expansion beam are separated by a gap along the first direction, the gap being used to accommodate electrical components, and the second side plate is in close contact with the adjacent anti-expansion beam along the first direction.

[0012] Optionally, it also includes an adhesive layer disposed between the base plate and the battery module;

[0013] Optionally, the reinforcing member is fixedly connected to or detachably connected to the anti-expansion beam.

[0014] Optionally, along the second direction, the distance between the battery module and the reinforcing member is d, satisfying: 3mm≤d≤5mm.

[0015] Secondly, embodiments of this application provide an electrical device comprising: a battery pack as described in any of the preceding claims.

[0016] In embodiments of this application, the battery pack has a first direction, a second direction, and a third direction that are perpendicular to each other; the battery pack includes a base plate, an anti-expansion beam, a reinforcing member, and a battery module; the anti-expansion beam is disposed on both sides of the base plate along the first direction and is fixedly connected to the base plate; the reinforcing member is disposed on both sides of the base plate along the second direction and is fixedly connected to the base plate, and the reinforcing member is connected to the anti-expansion beam on both sides along the first direction, so that the anti-expansion beam and the reinforcing member enclose a receiving space, and the battery module is disposed in the receiving space, wherein, along the third direction, the height of the reinforcing member is less than the height of the anti-expansion beam; the reinforcing member has a porous structure, and the porosity of the reinforcing member is greater than the porosity of the anti-expansion beam; and / or, the porosity of the reinforcing member is greater than the porosity of the base plate. Compared with related technologies, the reinforcing member replaces the side plate in the second direction of the battery pack. While ensuring structural stability, the height of the reinforcing member is lower, saving some space in the second direction of the battery pack. At the same time, the reinforcing member has a porous structure with a porosity greater than that of the thick expansion beam or the bottom plate, making the reinforcing member lighter and thus reducing the overall weight of the battery pack.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of a battery pack according to an embodiment of this application from a first-view perspective;

[0020] Figure 2 This is a schematic diagram of a battery pack according to an embodiment of this application from a second perspective;

[0021] Figure 3 This is a schematic diagram of a battery pack according to an embodiment of this application from a third-person perspective;

[0022] Figure 4 According to the embodiments of this application Figure 1 An enlarged view of part A, shown in the center circle;

[0023] Figure 5 This is a partial cross-sectional view of a battery pack according to an embodiment of this application.

[0024] Figure label:

[0025] 1: Base plate; 2: Anti-expansion beam; 3: Reinforcing member; 31: Shell; 311: First inner wall; 312: Second inner wall; 32: Core; 321: Cavity; 4: Accommodation space; 5: Battery module; 6: First side plate; 7: Second side plate; X: First direction; Y: Second direction; Z: Third direction. Detailed Implementation

[0026] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0027] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0028] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] Before explaining the battery pack and electrical equipment provided in the embodiments of this application, the application scenarios of the battery pack and electrical equipment provided in the embodiments of this application will be specifically described first:

[0031] The battery pack in this technology includes a top cover and a lower housing, which are connected vertically to protect the battery modules housed within. The lower housing is typically a closed structure on all four sides. Since the battery modules usually expand along their length during charging and discharging, the side panels in the width direction of the lower housing are not primary load-bearing structures. However, the presence of these side panels increases the overall weight of the lower housing and occupies space in the width direction of the battery modules, hindering lightweight battery pack design.

[0032] Therefore, this application provides a battery pack and an electrical device. The battery pack and electrical device provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0033] like Figure 1 and Figure 2As shown, according to some embodiments of the present application, the battery pack has a first direction X, a second direction Y, and a third direction Z that are perpendicular to each other. The battery pack includes a base plate 1, an anti-expansion beam 2, a reinforcing member 3, and a battery module 5. The anti-expansion beam 2 is disposed on both sides of the base plate 1 along the first direction X and is fixedly connected to the base plate 1. The reinforcing member 3 is disposed on both sides of the base plate 1 along the second direction Y and is fixedly connected to the base plate 1. The reinforcing member 1 is connected to the anti-expansion beam 2 on both sides along the first direction X so that the anti-expansion beam 2 and the reinforcing member 3 enclose and form an accommodating space 4. The battery module 5 is disposed in the accommodating space 4. The height of the reinforcing member 3 along the third direction Z is less than the height of the anti-expansion beam 2. The reinforcing member 3 has a porous structure and the porosity of the reinforcing member 3 is greater than the porosity of the anti-expansion beam 2.

[0034] In this embodiment, reinforcing members 3 with a height lower than that of the anti-expansion beam 2 are provided at both ends of the base plate 1 along the second direction Y. While ensuring the structural stability of the battery pack, compared with related technologies, the reinforcing members 3 replace the side plates of the battery pack in the second direction Y, and the height of the reinforcing members is lower, thereby saving some space in the second direction Y of the battery pack. At the same time, by setting the porosity of the reinforcing members 3 to be greater than that of the anti-expansion beam 2 and / or the base plate 1, the weight of the reinforcing members 3 can be further reduced while ensuring the structural connection stability, thereby reducing the overall weight of the battery pack. This is beneficial for the lightweighting of the battery pack, and the lighter weight of the reinforcing members 3 makes the overall weight of the battery pack smaller.

[0035] It should be noted that the height of the reinforcing member 3 is lower than that of the anti-expansion beam 3, that is, the height of the reinforcing member 3 is lower than that of the side plate in the second direction Y in the related technology (in the related technology, the height of the side plate in the second direction Y is greater than or equal to the height of the anti-expansion beam 2). The material density of the reinforcing member 3 may be the same as or different from that of the side plate in the second direction Y in the related technology. For example, the material density of the reinforcing member 3 is less than that of the side plate in the second direction Y in the related technology, thereby further reducing the weight of the reinforcing member 3, and further reducing the overall weight of the battery pack.

[0036] It should be explained that in practical applications, the first direction X is the length direction of the battery pack, the second direction Y is the width direction of the battery pack, and the third direction Z is the height direction of the battery pack. All three are perpendicular to each other.

[0037] In specific applications, the anti-expansion beams 2 are respectively disposed on both sides of the base plate 1 along the first direction X. The base plate 1 supports the battery module 5 in the third direction Z. The battery module 5 is disposed between the anti-expansion beams 2 along the first direction X. During the charging and discharging process of the battery module 5, due to lithium ion insertion and extraction or related side reactions (such as SEI film growth), or under high temperature environment, the internal materials of the battery module 5 will thermally expand, causing the battery module 5 to expand slightly in the first direction X. The anti-expansion beams 2 can abut against the two ends of the battery module 5 along the first direction X, thereby limiting the expansion of the battery module 5 and maintaining the stability of the internal space of the battery pack. In addition, the anti-expansion beams 2 can disperse external impact forces, reduce the possibility of the battery module 5 being directly impacted, and form protection for the battery module 5.

[0038] Understandably, the anti-expansion beams 2 can be set to any number of 2, 3, 4, etc. For example, there are 2 anti-expansion beams 2, namely the first anti-expansion beam and the second anti-expansion beam. The first anti-expansion beam and the second anti-expansion beam are respectively located on both sides of the base plate 1 along the first direction X. The battery module 5 is located between the first anti-expansion beam and the second anti-expansion beam. When the battery module 5 expands, the first anti-expansion beam and the second anti-expansion beam respectively abut against the two ends of the battery module 5 along the first direction X.

[0039] The number of reinforcing members 3 can be any number, such as 2, 3, or 4. For example, two reinforcing members 3 are provided, namely a first reinforcing member and a second reinforcing member. The first and second reinforcing members are respectively located on both sides of the base plate 1 along the second direction Y, so that the first anti-expansion beam, the second anti-expansion beam, the first reinforcing member, and the second reinforcing member are alternately connected end-to-end, enclosing and forming an accommodating space 4 to accommodate the battery module 5. Similarly, when multiple anti-expansion beams 2 and reinforcing members 3 are provided, multiple accommodating spaces 4 can be formed, thereby accommodating multiple battery modules 5.

[0040] It should be noted that the reinforcing member 3 is connected to the anti-expansion beam 2 on both sides along the first direction X, so that when the battery module 5 expands to exert a thrust on the anti-expansion beam 2, the thrust on the anti-expansion beam 2 can be transmitted along the reinforcing member 3. In other words, the reinforcing member 3 can give the anti-expansion beam 2 a tensile force along the first direction X that is opposite to the thrust direction of the battery module 5, thereby improving the stability and reliability of the anti-expansion beam 2.

[0041] Understandably, the porous structure of the reinforcing member 3 can be a regular porous structure, such as a honeycomb structure, a triangular mesh structure, a quadrilateral mesh structure, a lattice structure, or a foam structure; or an irregular porous structure, such as a biomimetic porous structure; or any other form of porous structure. As long as the strength requirements of the reinforcing member 3 are met, the weight of the reinforcing member 3 can be reduced. Those skilled in the art can make the settings according to the actual situation, and this application does not impose any restrictions on this.

[0042] Preferably, the reinforcing member 3 has a honeycomb structure, which enables the reinforcing member 3 to have high strength and anisotropy, and can be produced by stretch forming or 3D printing, which facilitates the large-scale mass production of the reinforcing member 3.

[0043] It should be noted that the base plate 1 needs to bear the weight of the battery module 5 in the third direction Z, which requires greater strength. It is usually a single-layer stamped steel plate or a die-cast integrated base plate. The anti-expansion beam 2 needs to bear the force in the first direction X, and usually has solid reinforcing ribs inside. This makes the overall weight of the battery pack relatively high. Since the reinforcing member 3 is not a major load-bearing structure, it is set as a porous structure to reduce weight, thereby reducing the overall weight of the battery pack.

[0044] In practical applications, the reinforcing member 3 is welded to the base plate 1, and the anti-expansion beam 2 is welded to the base plate 1, thus forming a stable connection and facilitating processing.

[0045] like Figure 4 and Figure 5 As shown, in some embodiments of this application, the reinforcing member 3 includes a housing 31 and a core 32 disposed within the housing 31; a cavity 321 is formed in the core 32; the housing 31 is fixedly connected to the base plate 1; and the housing 31 is also connected to the anti-expansion beam 2.

[0046] In this embodiment, the reinforcing member 3 includes a housing 31 and a core 32 disposed within the housing 31. A cavity 321 is formed in the core 32, thereby reducing the weight of the reinforcing member 31 and improving its compressive strength. The housing 31 is fixedly connected to the base plate 1 and to the anti-expansion beam 2, thereby forming a mechanical transmission network. This reduces the expansion force of the anti-expansion beam 2 on the battery module 5 to a certain extent, thereby reducing the risk of local deformation and improving the reliability and safety of the battery pack.

[0047] In specific applications, the outer shell 31 can be a closed shell or an open shell. Those skilled in the art can configure it according to actual needs, and this application does not impose any restrictions on this. A cavity 321 is formed in the core 32. The cavity 321 can be formed by a honeycomb structure, a lattice structure, or other structures, as long as the structural strength of the reinforcing member 3 can be guaranteed. Those skilled in the art can configure it according to actual needs, and this application does not impose any restrictions on this.

[0048] It should be explained that, in practical applications, the outer shell 31 and the base plate 1 can be fixed by welding or bonding, and the outer shell 31 and the anti-expansion beam 2 can be connected by welding, bonding, bolting, riveting, etc. Those skilled in the art can make the settings according to actual needs, and this application does not limit them.

[0049] Understandably, the cavity 321 formed in the core 32 can also save materials and further reduce the cost of the reinforcing member 3.

[0050] like Figure 4 As shown, in some embodiments of this application, the outer shell 31 includes a first inner wall 311 and a second inner wall 312, the first inner wall 311 and the second inner wall 312 are spaced apart along the second direction Y, and the core 32 is disposed between the first inner wall 311 and the second inner wall 312.

[0051] In this embodiment, the first inner wall 311 and the second inner wall 312 are spaced apart along the second direction Y to form the outer shell 31, which has a simpler structure and lower processing cost.

[0052] In practical applications, the first inner wall 311 and the second inner wall 312 are spaced apart along the second direction Y, thereby forming a gap to accommodate the core 32. This eliminates the need for additional sidewalls in the third direction Z, resulting in a simpler structure and lighter weight. For example, the first inner wall 311 and the second inner wall 321 are aluminum alloy plates, and the core 32 is a porous aluminum structure. The porous aluminum structure is placed between the two aluminum alloy plates and welded together to form the reinforcing member 3. This structure is simple, lighter, and easier to process.

[0053] Understandably, in practical applications, the first inner wall 311 and the second inner wall 312 can be welded to the base plate 1 along the third direction Z, or the first inner wall 311, the second inner wall 321 and the core 32 can all be welded to the base plate 1.

[0054] like Figure 5 As shown, in some embodiments of this application, the cross section of the cavity 321 along the third direction Z is at least one of hexagonal, pentagonal, quadrilateral, triangular, etc.

[0055] In this embodiment of the application, by setting the cross section of the cavity 321 along the third direction Z to at least one of hexagon, pentagon, quadrilateral, triangle, etc., the flexibility of the core 32 during processing can be improved, and the selection can be made according to actual needs, thereby reducing the cost of the reinforcing member 3.

[0056] It should be explained that the cross section of the cavity 321 along the third direction Z can also be any shape such as circular, elliptical, or irregular polygon. As long as the structural strength of the reinforcing member 3 is satisfied, the weight of the reinforcing member 3 can be reduced. Those skilled in the art can make the setting according to actual needs, and this application does not limit it.

[0057] Preferably, the cavity 321 has a hexagonal cross section along the third direction Z, that is, the core 32 has a honeycomb structure, which makes the reinforcing member 3 have good structural stability, and at the same time can buffer the expansion force of the anti-expansion beam 2 received by the battery module 5.

[0058] like Figure 2 As shown, in some embodiments of this application, along the third direction Z, the height of the reinforcing member 3 is H1, and the height of the anti-expansion beam 2 is H2, satisfying: 0.25≤H1 / H2≤0.75.

[0059] In this embodiment of the application, by setting the ratio H1 / H2 between the height H1 of the reinforcing member 3 and the height H2 of the anti-expansion beam 2 within a reasonable range, the overall structural strength of the battery pack is improved while meeting the requirements of lightweight design.

[0060] It should be explained that when the ratio H1 / H2 between the height H1 of the reinforcing member 3 and the height H2 of the anti-expansion beam 2 is less than 0.25, that is, when the height of the reinforcing member 3 is too low, the connection between the anti-expansion beam 2 and the reinforcing member 3 will be too small, and the structural strength cannot be guaranteed. When the ratio H1 / H2 between the height H1 of the reinforcing member 3 and the height H2 of the anti-expansion beam 2 is greater than 0.75, that is, when the height of the reinforcing member 3 is too large, the overall weight of the reinforcing member 3 will be too large, and it will not meet the requirements for lightweight battery packs.

[0061] In specific applications, the ratio H1 / H2 between the height H1 of the reinforcing member 3 and the height H2 of the anti-expansion beam 2 can be any value or a range between any two values, such as 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75.

[0062] like Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments of this application, the battery pack further includes a first side plate 6 and a second side plate 7, the first side plate 6 and the second side plate 7 are spaced apart along the first direction X, and both the first side plate 6 and the second side plate 7 are fixedly connected to the base plate 1; the first side plate 6 and the adjacent anti-expansion beam 2 form a gap along the first direction X, the gap is used to accommodate electrical components, and the second side plate 7 and the adjacent anti-expansion beam 2 are in close contact along the first direction X.

[0063] In this embodiment, the first side plate 6 and the second side plate 7 are adapted to be detachably connected to the top cover of the battery pack, thereby forming a closed structure to protect the internal battery module 5. The first side plate 6 and the second side plate 7 are both disposed on the side of the anti-expansion beam 2 away from the battery module 5 along the first direction X. The first side plate 6 and the adjacent anti-expansion beam 2 have a gap along the first direction X, which can accommodate electrical components and make reasonable use of the internal space. The second side plate 7 is in close contact with the adjacent anti-expansion beam 2 along the first direction X, which can provide support for the anti-expansion beam 2 along the first direction X and improve the resistance of the anti-expansion beam 2 to the expansion of the battery module 5.

[0064] It should be noted that the electrical components may specifically be liquid-cooled pipes or liquid-cooled plates; they may also be electrical components such as current sensors and temperature sensors. Those skilled in the art can configure them according to actual needs, and this application does not impose any restrictions on this.

[0065] In practical applications, the top cover (cover plate) of the battery pack is connected to the first side plate 6 and the second side plate 7 by means of bolt connection, welding, bonding, snap connection, etc., thereby forming a box with a certain degree of sealing, which protects the internal battery module 5 and electrical components.

[0066] In some embodiments of this application, the battery pack further includes an adhesive layer disposed between the base plate 1 and the battery module 5.

[0067] In this embodiment of the application, by providing an adhesive layer between the battery module 5 and the base plate 1, the battery module 5 can be pasted onto the base plate 1, avoiding the occurrence of shaking of the battery module 5 during use, thereby improving the reliability and safety of the battery pack.

[0068] In specific applications, the adhesive layer can be polyurethane structural adhesive, acrylic structural adhesive, epoxy resin adhesive, silicone, etc., which can fix the battery module 5 to the base plate 1, and at the same time buffer the battery module 5, reducing the impact force on the base plate 1 from being transmitted to the battery module 5 and affecting the battery module 5; in addition, the adhesive layer can also transfer the heat of the battery module 5 to the base plate 1, thereby reducing the temperature of the battery module 5.

[0069] It should be noted that in practical applications, the reinforcing member 3 can block the adhesive layer, reduce the possibility of the adhesive layer flowing out of the battery pack, and improve the reliability of the battery pack.

[0070] In some embodiments of this application, the reinforcing member 3 is fixedly connected to or detachably connected to the anti-expansion beam 2.

[0071] In this embodiment, the reinforcing member 3 is fixedly connected to the anti-expansion beam 2 or detachably connected. This satisfies the force transmission between the reinforcing member 3 and the anti-expansion beam 2, and also facilitates the disassembly and maintenance of the reinforcing member 3.

[0072] In specific applications, the connection between the reinforcing member 3 and the anti-expansion beam 2 can be welding, riveting, bolting, or other methods. Those skilled in the art can choose according to actual needs, and this application does not impose any restrictions on this.

[0073] like Figure 3 As shown, in some embodiments of this application, the distance between the battery module 5 and the reinforcing member 3 along the second direction Y is d, which satisfies: 3mm≤d≤5mm.

[0074] In this embodiment, by setting the distance d between the battery module 5 and the reinforcing member 3 within a reasonable range, the reinforcing member 3 can accommodate the overflowing adhesive layer without making the size of the battery pack along the second direction Y too large, thus reducing the overall size of the battery pack.

[0075] It needs to be explained that when the distance d between the battery module 5 and the reinforcing member 3 is less than 3mm, that is, when the reinforcing member 3 is too close to the battery module 5, the distance between the reinforcing member 3 and the battery module 5 is not enough to accommodate the overflowing adhesive layer, which will cause the adhesive layer to overflow and stick to the outside of the battery module 5, which is not conducive to the disassembly and maintenance of the battery module 5. On the other hand, when the distance d between the battery module 5 and the reinforcing member 3 is greater than 5mm, that is, when the reinforcing member 3 is too far from the battery module 5, the distance between the two reinforcing members 3 along the second direction Y is too large, which means that the width of the battery pack is too large.

[0076] In specific applications, the distance d between the battery module 5 and the reinforcing member 3 can be set to any value or a range between two arbitrary values, such as 3mm, 3.4mm, 3.8mm, 4mm, 4.4mm, 4.5mm, 4.8mm, 5mm.

[0077] In some embodiments of this application, this application also provides an electrical device, which includes a battery pack as described in any of the above embodiments.

[0078] In this embodiment, the battery pack has intersecting directions X, Y, and Z. The battery pack includes a base plate 1, at least two anti-expansion beams 2, at least two reinforcing members 3, and a battery module 5. Anti-expansion beams 2 are provided on both sides of the base plate 1 along the first direction X, and the anti-expansion beams 2 are fixedly connected to the base plate 1. Reinforcing members 3 are provided on both sides of the base plate 1 along the second direction Y, and the reinforcing members 3 are fixedly connected to the base plate 1. The anti-expansion beams 2 and the reinforcing members 3 enclose an accommodating space 4. The battery module 5 is disposed within the accommodating space 4. The height of the reinforcing member 3 along the third direction Z is less than the height of the anti-expansion beam 2. By providing reinforcing members 3 with a height lower than the anti-expansion beams 2 at both ends of the base plate 1 along the second direction Y, the structural stability of the battery pack is satisfied. Compared with related technologies, the reinforcing members 3 replace the side plates of the battery pack in the second direction Y, and their lower height saves some space in the second direction Y of the battery pack. Furthermore, the reinforcing members 3 are lighter, resulting in a lighter overall weight of the battery pack.

[0079] In specific applications, electrical equipment can be electric vehicles, such as pure electric vehicles, hybrid electric vehicles, electric motorcycles, electric ships, and aircraft; it can also be energy storage systems, such as energy storage cabinets and energy storage power stations; or it can be industrial equipment, such as electric excavators, electric loaders, electric forklifts, and automated guided vehicles.

[0080] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0081] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack having a first direction (X), a second direction (Y), and a third direction (Z) that are perpendicular to each other, characterized in that, include: Base plate (1); Anti-expansion beam (2), the anti-expansion beam (2) is disposed on both sides of the base plate (1) along the first direction (X), and the anti-expansion beam (2) is fixedly connected to the base plate (1); The reinforcing member (3) is disposed on both sides of the base plate (1) along the second direction (Y). The reinforcing member (3) is fixedly connected to the base plate (1). The reinforcing member (3) is connected to the anti-expansion beam (2) on both sides along the first direction (X) so that the anti-expansion beam (2) and the reinforcing member (3) enclose and form an accommodating space (4). and a battery module (5), which is disposed within the accommodating space (4); Wherein, along the third direction (Z), the height of the reinforcing member (3) is less than the height of the anti-expansion beam (2); the reinforcing member (3) is a porous structure, and the porosity of the reinforcing member (3) is greater than the porosity of the anti-expansion beam (2); and / or, the porosity of the reinforcing member (3) is greater than the porosity of the base plate (1).

2. The battery pack according to claim 1, characterized in that, The reinforcing member (3) includes a shell (31) and a core (32) disposed in the shell (31); a cavity (321) is formed in the core (32); the shell (31) is fixedly connected to the base plate (1); and the shell (31) is also connected to the anti-expansion beam (2).

3. The battery pack according to claim 2, characterized in that, The outer shell (31) includes a first inner wall (311) and a second inner wall (312), the first inner wall (311) and the second inner wall (312) are spaced apart along the second direction (Y), and the core (32) is disposed between the first inner wall (311) and the second inner wall (312).

4. The battery pack according to claim 3, characterized in that, The cavity (321) has a cross-section along the third direction (Z) that is at least one of hexagonal, pentagonal, quadrilateral, or triangular.

5. The battery pack according to any one of claims 1-4, characterized in that, Along the third direction (Z), the height of the reinforcing member (3) is H1, and the height of the anti-expansion beam (2) is H2, satisfying: 0.25≤H1 / H2≤0.

75.

6. The battery pack according to any one of claims 1-4, characterized in that, The battery pack also includes a first side plate (6) and a second side plate (7), the first side plate (6) and the second side plate (7) are spaced apart along the first direction (X), and both the first side plate (6) and the second side plate (7) are fixedly connected to the bottom plate (1); the first side plate (6) and the adjacent anti-expansion beam (2) form a gap along the first direction (X), the gap is used to accommodate electrical components, and the second side plate (7) and the adjacent anti-expansion beam (2) are in close contact along the first direction (X).

7. The battery pack according to any one of claims 1-4, characterized in that, It also includes an adhesive layer, which is disposed between the base plate (1) and the battery module (5).

8. The battery pack according to any one of claims 1-4, characterized in that, The reinforcing member (3) is fixedly connected to or detachably connected to the anti-expansion beam (2).

9. The battery pack according to any one of claims 1-4, characterized in that, Along the second direction (Y), the distance between the battery module (5) and the reinforcing member (3) is d, which satisfies: 3mm≤d≤5mm.

10. An electrical appliance, characterized in that, include: The battery pack as described in any one of claims 1-9.

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