Battery packs and electrical equipment

Abstract

This application relates to the field of battery pack technology, and provides a battery pack and electrical device. The battery pack includes: an upper cover plate, a lower shell, and a bottom protective plate; the upper cover plate covers the lower shell and together with the lower shell forms a receiving cavity; the bottom protective plate is located on the side of the lower shell opposite to the upper cover plate; the lower shell includes an outer shell flange, and the bottom protective plate includes a protective plate flange; the outer shell flange and the outer protective plate flange are stacked; the outer shell flange has at least one shell mounting hole, and the outer protective plate flange has at least one protective plate mounting hole; at least one shell mounting hole and at least one protective plate mounting hole are coaxially arranged; wherein, the coaxial shell mounting hole and protective plate mounting hole are used to mount to the same mounting point through the same connector. The battery pack provided by the embodiments of this application can achieve a lightweight design of the battery pack while ensuring the overall structural rigidity and strength of the battery pack.

Description

Technical Field

[0001] This application relates to the field of battery pack technology, specifically to a battery pack and electrical equipment. Background Technology

[0002] As the primary power source, the battery pack is typically mounted on electrical equipment, such as the chassis of a vehicle. Currently, battery packs usually use the lower casing as a single load-bearing component, with mounting holes on it for connection to components of the electrical equipment. However, this split-mount design results in a single load path. Vibrations, impacts, and inertial forces generated by the electrical equipment are initially concentrated at the mounting point and then diffuse outwards through the walls of the lower casing. During severe bumps or bottom impacts, stress concentration easily occurs at the base of the mounting point, causing most of the stress to be transferred to the connection between the casing and the mounting point. This can easily lead to casing cracking or connection failure, affecting the overall structural rigidity and strength of the battery pack.

[0003] To address this, related technologies typically compensate for insufficient structural rigidity by increasing the thickness of the lower casing or adding numerous dense reinforcing ribs. However, this design not only increases material usage and complicates the manufacturing process but also significantly increases the overall weight of the battery pack. Summary of the Invention

[0004] This application aims to address at least one of the technical problems existing in the related art. To this end, this application proposes a battery pack and electrical device that can achieve a lightweight design of the battery pack while ensuring the overall structural rigidity and strength of the battery pack.

[0005] A battery pack according to a first aspect of the present application includes: an upper cover plate, a lower housing, and a bottom protective plate; The upper cover plate is placed on the lower housing and together with the lower housing, they enclose a receiving cavity; The bottom protective plate is located on the side of the lower housing opposite to the upper cover plate; The lower housing includes an outer flange, and the bottom protective plate includes an outer flange; the outer flange of the housing and the outer flange of the protective plate are stacked together. The outer flange of the housing is provided with at least one housing mounting hole, and the outer flange of the protective plate is provided with at least one protective plate mounting hole; at least one housing mounting hole and at least one protective plate mounting hole are coaxially arranged; wherein, the coaxial housing mounting hole and the protective plate mounting hole are used to be mounted to the same mounting point through the same connector.

[0006] By creating mounting holes on the outward flanges of both the lower housing and the bottom protective plate, and simultaneously mounting these coaxial mounting holes to the same mounting point, a rigid connection is formed between the previously relatively independent bottom protective plate and the lower housing at the mounting point, creating a composite load-bearing structure. This structure alters the traditional load path where the lower housing bears the load alone, allowing vibrations and impacts generated at the mounting point to be rapidly dispersed and transmitted between the lower housing and the bottom protective plate through the outward flanges. This increases the overall cross-sectional moment of inertia of the entire battery pack and effectively avoids stress concentration at the mounting point. Furthermore, since the bottom protective plate directly participates in structural load-bearing, the stress burden on the lower housing is reduced, allowing for a corresponding reduction in its wall thickness. This achieves a lightweight design of the battery pack while ensuring its overall structural rigidity and strength.

[0007] According to one embodiment of this application, the battery pack further includes an outer edge beam; The outer edge beam is located between the outer flange of the shell and the outer flange of the protective plate; The outer beam is provided with at least one side beam mounting hole, and at least one side beam mounting hole is coaxially arranged with at least one shell mounting hole; wherein, the coaxial side beam mounting hole and the shell mounting hole are used to be mounted to the same mounting point through the same connector.

[0008] According to one embodiment of this application, the extension direction of the outer beam is consistent with the extension direction of the outer flange of the shell.

[0009] According to one embodiment of this application, the upper cover plate includes an outer flange, and the outer flange of the cover plate is stacked with the outer flange of the housing; The outer flange of the cover plate is provided with at least one cover plate mounting hole; At least one of the cover plate mounting holes and at least one of the housing mounting holes are coaxially arranged, and the coaxial cover plate mounting hole and housing mounting hole are used to mount to the same mounting point through the same connector.

[0010] According to one embodiment of this application, a flow channel plate is provided between the lower shell and the bottom protective plate; the flow channel plate and the lower shell enclose a heat exchange flow channel.

[0011] According to one embodiment of this application, the flow channel plate and the lower housing are welded by friction stir welding.

[0012] According to one embodiment of this application, at least one first partition beam extending along a first direction is provided inside the receiving cavity; wherein the first partition beam is used to divide the receiving cavity into a plurality of sub-cavities.

[0013] According to one embodiment of this application, at least one second partition beam extending in a second direction is provided within the receiving cavity; The first direction and the second direction are orthogonal.

[0014] A battery pack according to a second aspect embodiment of this application includes: an upper cover plate, a lower housing, a bottom protective plate, an outer side beam, and a flow channel plate; The upper cover plate is placed on the lower housing and together with the lower housing, they enclose a receiving cavity; The bottom protective plate is located on the side of the lower housing opposite to the upper cover plate; The upper cover plate includes an outward flange, the lower housing includes an outward flange, and the bottom protective plate includes an outward flange; the outward flanges of the cover plate, the housing, and the protective plate are stacked sequentially. The outer edge beam is located between the outer flange of the shell and the outer flange of the protective plate, and its extension direction is consistent with that of the outer flange of the shell; The outer flange of the cover plate is provided with at least one cover plate mounting hole, the outer flange of the shell is provided with at least one shell mounting hole, the outer flange of the guard plate is provided with at least one guard plate mounting hole, and the outer side beam is provided with at least one side beam mounting hole. The mounting holes of the cover plate, the mounting holes of the shell, the mounting holes of the protective plate, and the mounting holes of the side beam are one-to-one and coaxially arranged. The coaxial mounting holes of the cover plate, the mounting holes of the shell, the mounting holes of the protective plate, and the mounting holes of the side beam are used to be mounted to the same mounting point through the same connector. The flow channel plate is located between the lower shell and the bottom protective plate, forming a heat exchange flow channel with the lower shell.

[0015] The electrical device according to the third aspect of this application includes a battery pack as described in the first or second aspect.

[0016] The above-described one or more technical solutions in the embodiments of this application have at least one of the following technical effects: By creating mounting holes on the outer flanges of the upper cover, lower shell, outer beam between the lower shell and bottom protective plate, and the outer flange of the bottom protective plate, and simultaneously mounting these coaxial mounting holes to the same mounting point, a composite load-bearing structure is constructed. This alters the traditional load path of a single shell, allowing vibrations and impacts generated at the mounting point to be rapidly dispersed and transmitted through the upper cover, lower shell, bottom protective plate, and outer beam. This significantly increases the overall cross-sectional moment of inertia of the entire battery pack and effectively avoids stress concentration at the mounting point. Furthermore, since the upper cover, lower shell, outer beam, and steel protective plate all directly participate in structural load-bearing, the stress burden on the lower shell is reduced, allowing for a corresponding reduction in its wall thickness. This achieves a lightweight battery pack design while maintaining or even increasing the overall rigidity and strength.

[0017] In addition, the lower casing replaces the traditional upper liquid cooling plate, and together with the flow channel plate, they enclose the heat exchange channel, thus eliminating the need for an additional upper liquid cooling plate, which further reduces the weight of the battery pack. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a first exploded structural diagram of a battery pack provided in an embodiment of this application; Figure 2 This is a partially enlarged structural schematic diagram of a battery pack provided in an embodiment of this application; Figure 3 This is a partial exploded structural diagram of a battery pack provided in an embodiment of this application; Figure 4 This is a schematic diagram of the outer beam provided in one embodiment of this application; Figure 5 This is a partial structural schematic diagram of a battery pack provided in an embodiment of this application; Figure 6 This is a second exploded view of the battery pack provided in an embodiment of this application; Figure 7 This is a mapping diagram of the flow channel plate in the thickness direction provided in an embodiment of this application; Figure 8 This is a third exploded view of the battery pack provided in an embodiment of this application; Figure 9 This is a fourth exploded view of the battery pack provided in an embodiment of this application; The reference numerals in the detailed embodiments are as follows: 10-Upper cover plate; 11-Lower shell; 12-Bottom guard plate; 13-Outer side beam; 14-Flow channel plate; 15-First partition beam; 16-Second partition beam; Shell outer flange-101; Guard plate outer flange-102; Shell mounting hole-103; Guard plate mounting hole-104; 105-Shell side; 106-Shell bottom; 107-Guard plate side; 108-Guard plate bottom; 109-Side beam mounting hole; 110-Cover plate outer flange; 111-Cover plate mounting hole. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0022] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0023] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0024] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0025] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), and similarly, "multiple items" refers to two or more (including two).

[0026] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0027] In the embodiments of this application, the battery pack may include, but is not limited to, lithium-ion secondary battery packs, lithium-ion primary battery packs, lithium-sulfur battery packs, sodium-lithium-ion battery packs, sodium-ion battery packs, or magnesium-ion battery packs. The shape of the battery pack may include, but is not limited to, cylinders, flat bodies, cuboids, or other shapes. The battery pack mentioned in the embodiments of this application includes a housing for encapsulating one or more battery cells. The housing can reduce the risk of liquids or other foreign matter affecting the charging or discharging of the battery cells.

[0028] The following discussion will primarily focus on cuboid battery packs. It should be understood that the embodiments described below are also applicable to cylindrical or blade battery packs.

[0029] In some embodiments of this application, the battery pack includes a housing and individual battery cells, with the individual battery cells housed within the housing. The housing provides a cavity for the individual battery cells and can employ various structures. In some embodiments of this application, the housing may include an upper cover and a lower housing, which overlap to define a cavity for accommodating the individual battery cells. For example, the lower housing may be a hollow structure open at one end, and the upper cover may be a plate-like structure, covering the open side of the lower housing so that the upper cover and lower housing together define the cavity; alternatively, both the upper cover and lower housing may be hollow structures open on one side, with the open side of the upper cover overlapping the open side of the lower housing. It is understood that the housing formed by the upper cover and lower housing can be of various shapes, such as a cylinder, a cuboid, etc.

[0030] In addition, the battery pack casing is usually equipped with a bottom protection plate, which is usually located on the side of the lower casing away from the upper cover plate, to protect the bottom of the battery pack.

[0031] As the primary power source, the battery pack is typically mounted on electrical equipment via a casing, such as by mounting the casing to the vehicle's chassis. Currently, the method for mounting the battery pack casing to electrical equipment involves using the lower housing as a single load-bearing component, with mounting holes on the lower housing for connection to components of the electrical equipment. Alternatively, mounting holes can be provided on the outer beam welded to the lower housing for connection to components of the electrical equipment.

[0032] However, this split-mount design results in a single load path. Vibrations, impacts, and inertial forces generated by electrical equipment are initially concentrated at the mounting point and then diffuse outwards through the walls of the lower casing. During severe bumps or bottom impacts, stress concentration easily occurs at the base of the mounting point, causing most of the stress to be transferred to the connection between the casing and the mounting point. This can easily lead to casing cracking or connection failure, affecting the overall structural rigidity and strength of the battery pack.

[0033] To address this, related technologies typically compensate for insufficient structural rigidity by increasing the thickness of the lower casing or adding numerous dense reinforcing ribs. However, this design not only increases material usage and complicates the manufacturing process but also significantly increases the overall weight of the battery pack.

[0034] To address the aforementioned technical problems, this application embodiment provides a composite load-bearing structure by creating mounting holes on the outer flanges of both the lower housing and the bottom protective plate, and simultaneously mounting these coaxial mounting holes to the same mounting point. This allows the previously relatively independent bottom protective plate and lower housing to form a rigid connection at the mounting point. This structure alters the traditional load path where the lower housing bears the load alone, enabling vibrations and impacts generated at the mounting point to be rapidly dispersed and transmitted between the lower housing and the bottom protective plate through the outer flanges. This increases the overall cross-sectional moment of inertia of the entire battery pack and effectively avoids stress concentration at the mounting point. Furthermore, since the bottom protective plate directly participates in structural load-bearing, the stress burden on the lower housing is reduced, allowing for a corresponding reduction in its wall thickness. This achieves a lightweight design of the battery pack while ensuring its overall structural rigidity and strength.

[0035] The technical solutions described in this application are applicable to battery packs and electrical devices using battery packs. These electrical devices include, but are not limited to: mobile phones, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, and power tools, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.

[0036] Taking a vehicle as an example, the vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle's interior can house a motor, a controller, and a battery pack. The controller controls the battery pack to supply power to the motor. The battery pack is mounted on the vehicle chassis via mounting points to provide power to the vehicle. For example, the battery pack can serve as the vehicle's operating power source for its electrical system, such as for the power needs of starting, navigation, and operation. In another embodiment of this application, the battery pack can not only serve as the vehicle's operating power source but also as its driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle.

[0037] Battery packs provided according to some embodiments of this application, such as Figure 1 As shown, it includes: an upper cover plate 10, a lower housing 11, and a bottom protective plate 12; The upper cover plate 10 covers the lower housing 11 and together with the lower housing 11, forms a receiving cavity; The bottom protective plate 12 is located on the side of the lower housing 11 opposite to the upper cover plate 10; The lower housing 11 includes an outer flange, and the bottom protective plate 12 includes an outer flange 102; the outer flange of the housing and the outer flange 102 of the protective plate are stacked together. The outer flange of the housing is provided with at least one housing mounting hole 103, and the outer flange of the protective plate 102 is provided with at least one protective plate mounting hole; at least one housing mounting hole 103 and at least one protective plate mounting hole are coaxially arranged; wherein, the coaxial housing mounting hole 103 and the protective plate mounting hole are used to be mounted to the same mounting point through the same connector.

[0038] In some embodiments, the lower housing 11 can be a hollow structure with one open end, and the upper cover 10 covers the open side of the lower housing 11, forming a receiving cavity for accommodating at least one battery cell. The lower housing 11 can be made of high-strength 6-series stamped aluminum sheet, which can reduce the weight of the entire pack while significantly increasing the energy density of the entire pack. A bottom protective plate 12 is provided on the side of the lower housing 11 opposite to the upper cover 10, and the bottom protective plate 12 can be a steel protective plate.

[0039] like Figure 1-2As shown, both the lower housing 11 and the bottom protective plate 12 include outwardly bent flanges, meaning both can be basin-shaped structures. The side surfaces 107 of the lower housing 11 and the bottom protective plate 12 can be fixed by riveting or welding. Furthermore, the bottom surfaces of the lower housing 11 and the bottom protective plate 12 can also be fixed by riveting or welding. This improves the overall rigidity of the battery pack while also protecting the bottom of the battery pack from lateral impacts, increasing battery pack safety. Specifically, the side surface 105 of the lower housing 11 refers to the surface between the outwardly bent flange and the bottom surface 106 of the lower housing 11, and the side surface 107 of the bottom protective plate 12 refers to the surface between the outwardly bent flange and the bottom surface of the bottom protective plate 12.

[0040] The outer flange of the lower shell 11 is the outer shell flange, and the outer flange of the bottom protective plate 12 is the outer protective plate flange 102. The outer shell flange and the outer protective plate flange 102 are stacked, meaning that the outer shell flange and the outer protective plate flange 102 overlap in the thickness direction. The outer shell flange and the outer protective plate flange 102 can be placed close together and stacked together, or they can be separated with a gap.

[0041] The outer flange of the housing has at least one housing mounting hole 103, and the outer flange of the protective plate 102 has at least one protective plate mounting hole. The number of housing mounting holes 103 on the outer flange of the housing and the number of protective plate mounting holes on the outer flange of the protective plate 102 can be the same or different. At least one housing mounting hole 103 and at least one protective plate mounting hole are coaxially arranged. For example, the number of housing mounting holes 103 on the outer flange of the housing is the same as the number of protective plate mounting holes on the outer flange of the protective plate 102, and the housing mounting holes 103 on the outer flange of the housing and the protective plate mounting holes on the outer flange of the protective plate 102 correspond one-to-one and are coaxially arranged.

[0042] Fasteners such as screws can pass through the coaxially arranged housing mounting hole 103 and guard plate mounting hole simultaneously to mount the coaxially arranged housing mounting hole 103 and guard plate mounting hole to the same mounting point. For example, the coaxially arranged housing mounting hole 103 and guard plate mounting hole can be mounted to the same mounting hole of the vehicle chassis through the fastener, so that the coaxially arranged housing mounting hole 103 and guard plate mounting hole are connected to the same mounting hole of the vehicle chassis through the same fastener.

[0043] By creating mounting holes on the outward flanges of both the lower housing and the bottom protective plate, and simultaneously mounting these coaxial mounting holes to the same mounting point, a rigid connection is formed between the previously relatively independent bottom protective plate and the lower housing at the mounting point, creating a composite load-bearing structure. This structure alters the traditional load path where the lower housing bears the load alone, allowing vibrations and impacts generated at the mounting point to be rapidly dispersed and transmitted between the lower housing and the bottom protective plate through the outward flanges. This increases the overall cross-sectional moment of inertia of the entire battery pack and effectively avoids stress concentration at the mounting point. Furthermore, since the bottom protective plate directly participates in structural load-bearing, the stress burden on the lower housing is reduced, allowing for a corresponding reduction in its wall thickness. This achieves a lightweight design of the battery pack while ensuring its overall structural rigidity and strength.

[0044] To further ensure the overall structural rigidity and strength of the battery pack, such as Figure 3 As shown, in some embodiments, the battery pack also includes an outer edge beam 13; The outer edge beam 13 is located between the outer flange 101 of the shell and the outer flange 102 of the protective plate; The outer beam 13 is provided with at least one side beam mounting hole 109, and at least one side beam mounting hole 109 and at least one housing mounting hole 103 are coaxially arranged; wherein, the coaxial side beam mounting hole 109 and housing mounting hole 103 are used to be mounted to the same mounting point through the same connector.

[0045] In some embodiments, the outer edge beam 13 can be an AL6082-T6 type outer edge beam. The outer edge beam 13 is disposed between the outer flange 101 of the housing and the outer flange 102 of the protective plate, such as being riveted between the outer flange 101 of the housing and the outer flange 102 of the protective plate.

[0046] In some embodiments, the extending direction of the outer beam 13 coincides with the extending direction of the outer flange 101 of the housing. For example, as... Figure 4-5 As shown, rectangular outer beams 13 are provided on opposite sides of the outer flange 101 of the housing. Each outer beam 13 includes a first surface facing the outer flange of the lower housing 11, a second surface facing the side surface 105 of the lower housing 11, a third surface facing the outer flange 102 of the protective plate, and a fourth surface facing away from the second surface. The first surface can be fitted with the outer flange of the lower housing 11, the second surface can be fitted with the side surface 105 of the lower housing 11, the third surface can be fitted with the outer flange 102 of the protective plate, and the fourth surface can be flush with the edge of the outer flange of the lower housing 11, thereby increasing the overall structural rigidity and strength of the battery pack.

[0047] In some embodiments, the outer side beam 13 is provided with at least one side beam mounting hole 109. The number of mounting holes on the outer side beam 13 may be the same as or different from the number of housing mounting holes 103 on the outer flange 101 of the housing. At least one side beam mounting hole 109 and at least one housing mounting hole 103 are coaxially arranged, so that the coaxial side beam mounting hole 109 and housing mounting hole 103 can be mounted to the same mounting point through the same connector, thereby enabling stress distribution through the outer side beam 13, and further improving the overall structural rigidity and strength of the battery pack.

[0048] To further ensure the overall structural rigidity and strength of the battery pack, in some embodiments, at least one side beam mounting hole 109, at least one housing mounting hole 103, and at least one protective plate mounting hole 104 are coaxially arranged simultaneously. For example, the number of housing mounting holes 103 on the outer flange 101 of the housing is the same as the number of side beam mounting holes 109 on the outer side beam 13 and the number of protective plate mounting holes 104 on the outer flange 102 of the protective plate. The housing mounting holes 103, side beam mounting holes 109, and protective plate mounting holes 104 correspond one-to-one and are coaxially arranged, so that the coaxially arranged side beam mounting holes 109, housing mounting holes 103, and protective plate mounting holes 104 can be mounted to the same mounting point through the same connector. By using a connector, the coaxially arranged housing mounting hole 103, outer side beam 13 mounting hole, and guard plate mounting hole 104 can be simultaneously mounted to the same mounting hole on the vehicle chassis. This allows the coaxially arranged housing mounting hole 103, outer side beam 13 mounting hole, and guard plate mounting hole 104 to be connected to the same mounting hole on the vehicle chassis via the same connector. This enables the stress generated at the mounting point to be distributed simultaneously among the lower housing 11, outer side beam 13, and bottom guard plate 12, thereby further improving the overall structural rigidity and strength of the battery pack.

[0049] To further improve the overall structural rigidity and strength of the battery pack, in some embodiments, such as Figure 6 As shown, the upper cover 10 of the battery pack includes an outer flange 110, which is stacked with the outer flange 101 of the housing. The outer flange 110 of the cover plate is provided with at least one cover plate mounting hole 111; At least one of the cover plate mounting holes 111 and at least one of the housing mounting holes 103 are coaxially arranged, and the coaxial cover plate mounting holes 111 and housing mounting holes 103 are used to mount to the same mounting point through the same connector.

[0050] The overlapping arrangement of the outer flange 110 of the cover plate and the outer flange 101 of the housing means that the outer flange 110 of the cover plate and the outer flange 101 of the housing overlap in the thickness direction. The outer flanges 110 of the cover plate are attached to each other and stacked together. For example, the upper cover plate 10 can be fixed to the lower housing 11 by riveting, welding or bolting, so that the outer flanges 110 of the cover plate are attached to each other.

[0051] The outer flange 110 of the cover plate is provided with at least one cover plate mounting hole 111 coaxial with the housing mounting hole 103. The number of cover plate mounting holes 111 can be the same as the number of housing mounting holes 103, or they can be different. For example, the number of cover plate mounting holes 111 is the same as the number of housing mounting holes 103, and the cover plate mounting holes 111 and housing mounting holes 103 correspond one-to-one and are coaxially arranged. The coaxial cover plate mounting holes 111 and housing mounting holes 103 can be mounted to the same mounting point through the same connector, thereby also enabling stress distribution through the outer flange 110 of the cover plate, further improving the overall structural rigidity and strength of the battery pack.

[0052] In some embodiments, at least one cover plate mounting hole 111, at least one housing mounting hole 103, and at least one protective plate mounting hole 104 are coaxially arranged. For example, the number of cover plate mounting holes 111 on the outer flange 110 of the cover plate is the same as the number of housing mounting holes 103 on the outer flange 101 of the housing and the number of protective plate mounting holes 104 on the outer flange 102 of the protective plate. The cover plate mounting holes 111, housing mounting holes 103, and protective plate mounting holes 104 correspond one-to-one and are coaxially arranged, so that the coaxially arranged cover plate mounting holes 111, housing mounting holes 103, and protective plate mounting holes 104 can be mounted to the same mounting point through the same connector. By means of a connector, the coaxially arranged cover plate mounting hole 111, housing mounting hole 103, and guard plate mounting hole 104 can be simultaneously mounted to the same mounting hole on the vehicle chassis, so that the coaxially arranged cover plate mounting hole 111, housing mounting hole 103, and guard plate mounting hole 104 are connected to the same mounting hole on the vehicle chassis through the same connector, thereby the stress generated at the mounting point is simultaneously distributed by the upper housing, lower housing 11, and bottom guard plate 12.

[0053] Alternatively, in some embodiments, at least one cover plate mounting hole 111, at least one housing mounting hole 103, at least one side beam mounting hole 109, and at least one guard plate mounting hole 104 are simultaneously and coaxially arranged. For example, the number of cover plate mounting holes 111 on the outer flange 110 of the cover plate is the same as the number of housing mounting holes 103 on the outer flange 101 of the housing, the number of side beam mounting holes 109 on the outer side beam 13, and the number of guard plate mounting holes 104 on the outer flange 102 of the guard plate. The four mounting holes 111, housing, side beam, and guard plate are one-to-one and coaxially arranged, so that the coaxially arranged mounting holes 111, housing, side beam, and guard plate can be mounted to the same mounting point through the same connector. By means of a connector, the coaxially arranged cover plate mounting hole 111, housing mounting hole 103, side beam mounting hole 109, and guard plate mounting hole 104 can be simultaneously mounted to the same mounting hole on the vehicle chassis. This allows the coaxially arranged cover plate mounting hole 111, housing mounting hole 103, side beam mounting hole 109, and guard plate mounting hole 104 to be connected to the same mounting hole on the vehicle chassis via the same connector. As a result, the stress generated at the mounting point is simultaneously distributed by the upper housing, lower housing 11, outer side beam 13, and bottom guard plate 12.

[0054] Considering the heat dissipation requirements of the battery pack, a liquid cooling plate and a flow channel plate are typically installed between the lower housing and the bottom protective plate of the battery pack. The liquid cooling plate and the flow channel plate enclose a heat exchange channel through which the coolant passes to dissipate heat from the battery pack. However, this method requires the addition of at least two metal plates between the lower housing 11 and the bottom protective plate 12, resulting in an excessively heavy overall weight of the battery pack. Therefore, in some embodiments, such as... Figure 7 As shown, a flow channel plate 14 is provided between the lower shell 11 and the bottom protective plate 12; the flow channel plate 14 and the lower shell 11 enclose a heat exchange flow channel.

[0055] In some embodiments, the bottom surface 106 of the lower housing 11 is a plane, which can directly serve as the upper plate of the liquid cooling plate and the flow channel plate 14 to enclose a heat exchange channel for the coolant to flow through. This eliminates the need for an additional upper plate of the liquid cooling plate, reducing the overall weight of the battery pack.

[0056] In some embodiments, the flow channel plate 14 and the lower housing 11 are welded by friction stir welding to facilitate the formation of flow channels.

[0057] In some embodiments, the flow channel plate 14 may be fixedly connected to the bottom protective plate 12, such as by welding or riveting, to secure the flow channel plate 14. For example, the bottom surface 106 of the lower housing 11 may be riveted together with the flow channel plate 14 and the bottom surface 108 of the bottom protective plate 12.

[0058] To reduce the impact of stress generated at the battery pack mounting points on the flow channel plate 14, in some embodiments, such as Figure 8 As shown, the orthographic projection of the flow channel plate 14 in the thickness direction does not intersect with the orthographic projection of the outer flange 101 of the lower housing 11 in the thickness direction of the flow channel plate 14.

[0059] For example, the area where the flow channel plate 14 is located is the projection area of ​​the bottom surface 106 of the lower housing 11 in the thickness direction. Since the orthographic projection of the flow channel plate 14 in the thickness direction does not intersect with the orthographic projection of the outer flange 101 of the lower housing 11 in the thickness direction, the stress generated at the mounting point must be transmitted to the flow channel plate 14 through the outer flange 101 and the side surface 105 of the lower housing 11. This reduces the stress on the flow channel plate 14 and reduces the possibility of damage to the flow channel plate 14 due to the stress generated at the mounting point.

[0060] To further improve the structural strength of the battery pack, in some embodiments, such as Figure 9 As shown, at least one first partition beam 15 extending along a first direction is erected inside the receiving cavity enclosed by the upper cover plate 10 and the lower shell 11; wherein, the first partition beam 15 is used to divide the receiving cavity into multiple sub-cavities.

[0061] In some embodiments, the first partition beam 15 extending along the first direction can be connected to the lower housing 11 by riveting or welding to divide the receiving cavity into multiple sub-cavities. The first partition beam 15 can also be riveted to the flow channel plate 14 and the bottom guard plate 12, such that the side of the first partition beam 15 facing the bottom surface of the lower housing 11 is riveted to the flow channel plate 14 and the bottom guard plate 12 through the bottom surface 106 of the lower housing 11 by rivets.

[0062] The first partition beam 15 can further improve the structural strength of the battery pack, thereby effectively protecting the individual battery cells located in the sub-cavity and improving the overall safety of the battery pack.

[0063] In some embodiments, such as Figure 9 As shown, at least one second partition beam 16 extending along a second direction is also erected within the receiving cavity enclosed by the upper cover plate 10 and the lower shell 11; wherein, the first direction and the second direction are orthogonal.

[0064] In some embodiments, the second partition beam 16 extending along the second direction can be connected to the lower housing 11 by riveting or welding to cooperate with the first partition beam 15 to divide the receiving cavity into multiple sub-cavities. The second partition beam 16 can also be riveted to the flow channel plate 14 and the bottom guard plate 12, for example, the side of the second partition beam 16 facing the bottom surface of the lower housing 11 is riveted to the flow channel plate 14 and the bottom guard plate 12 through the bottom surface 106 of the lower housing 11 by rivets.

[0065] By combining the first partition beam 15 and the second partition beam 16, the structural strength of the battery pack can be further improved, thereby effectively protecting the individual battery cells located in the sub-cavity and further improving the overall safety of the battery pack.

[0066] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below. In some embodiments, such as Figure 9 As shown, a battery pack is provided, including: an upper cover plate 10, a lower shell 11, a bottom protective plate 12, an outer side beam 13, and a flow channel plate 14; The upper cover plate 10 covers the lower housing 11, and together with the lower housing 11, they enclose a receiving cavity for accommodating the battery cell; The bottom protective plate 12 is located on the side of the lower housing 11 opposite to the upper cover plate 10; The upper cover plate 10 includes an outer flange 110, the lower housing 11 includes an outer flange 101, and the bottom protective plate 12 includes an outer flange 102; the outer flange 110, the outer flange 101, and the outer flange 102 are stacked sequentially. The outer beam 13 is located between the outer flange 101 of the shell and the outer flange 102 of the guard plate, and its extension direction is consistent with the outer flange 101 of the shell. The outer flange of the cover plate 110 is provided with at least one cover plate mounting hole 111, the outer flange of the shell 101 is provided with at least one shell mounting hole 103, the outer flange of the guard plate 102 is provided with at least one guard plate mounting hole 104, and the outer side beam 13 is provided with at least one side beam mounting hole 109. The cover plate mounting hole 111, the shell mounting hole 103, the guard plate mounting hole 104, and the side beam mounting hole 109 are one-to-one and coaxially arranged. The coaxial cover plate mounting hole 111, shell mounting hole 103, guard plate mounting hole 104, and side beam mounting hole 109 are used to mount to the same mounting point through the same connector. The flow channel plate 14 is disposed between the lower shell 11 and the bottom protective plate 12, and together with the lower shell 11, it encloses a heat exchange flow channel; wherein, the orthographic projection of the flow channel plate 14 in the thickness direction does not intersect with the orthographic projection of the outer flange 101 of the lower shell 11 in the thickness direction of the flow channel plate 14.

[0067] By creating mounting holes on the outer flanges of the upper cover plate 10, the lower shell 11, the outer beam 13 located between the lower shell 11 and the bottom protective plate 12, and the outer flange of the bottom protective plate 12, and simultaneously mounting these coaxial mounting holes to the same mounting point, a composite load-bearing structure is constructed. This changes the traditional load path of a single shell, allowing vibrations and impacts generated at the mounting point to be quickly dispersed and transmitted through the upper cover plate 10, lower shell 11, bottom protective plate 12, and outer beam 13. This significantly increases the overall cross-sectional moment of inertia of the entire pack and effectively avoids stress concentration at the mounting point. Furthermore, since the upper cover plate 10, lower shell 11, outer beam 13, and steel protective plate all directly participate in structural load-bearing, the stress burden on the lower shell 11 is reduced, allowing for a corresponding reduction in its wall thickness. This achieves a lightweight design of the battery pack while maintaining or even improving the overall rigidity and strength.

[0068] In addition, the lower housing 11 replaces the traditional liquid cooling plate upper plate and forms a heat exchange channel with the flow channel plate 14, so that there is no need to add a liquid cooling plate upper plate, thereby further reducing the weight of the battery pack.

[0069] In some embodiments, an electrical device is also provided, which can be an electrical device such as a car that uses a battery as a power source. This electrical device is equipped with a battery pack as described in any of the above embodiments. For example, the electrical device is a car, and the battery pack is mounted on a mounting point on the car's chassis.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack, characterized by, include: Top cover, lower housing, and bottom protective plate; The upper cover plate is placed on the lower housing and together with the lower housing, they enclose a receiving cavity; The bottom protective plate is located on the side of the lower housing opposite to the upper cover plate; The lower housing includes an outer flange, and the bottom protective plate includes an outer flange; the outer flange of the housing and the outer flange of the protective plate are stacked together. The outer flange of the housing is provided with at least one housing mounting hole, and the outer flange of the protective plate is provided with at least one protective plate mounting hole; at least one housing mounting hole and at least one protective plate mounting hole are coaxially arranged; wherein, the coaxial housing mounting hole and the protective plate mounting hole are used to be mounted to the same mounting point through the same connector.

2. The battery pack of claim 1, wherein, The battery pack also includes an outer edge beam; The outer edge beam is located between the outer flange of the shell and the outer flange of the protective plate; The outer beam is provided with at least one side beam mounting hole, and at least one side beam mounting hole is coaxially arranged with at least one shell mounting hole; wherein, the coaxial side beam mounting hole and the shell mounting hole are used to be mounted to the same mounting point through the same connector.

3. The battery pack of claim 2, wherein, in, The extension direction of the outer beam is consistent with the extension direction of the outer flange of the shell.

4. The battery pack of any one of claims 1-3, wherein, The upper cover plate includes an outer flange, which is stacked with the outer flange of the housing. The outer flange of the cover plate is provided with at least one cover plate mounting hole; At least one of the cover plate mounting holes and at least one of the housing mounting holes are coaxially arranged, and the coaxial cover plate mounting hole and housing mounting hole are used to mount to the same mounting point through the same connector.

5. The battery pack according to claim 1, characterized in that, A flow channel plate is provided between the lower shell and the bottom protective plate; the flow channel plate and the lower shell enclose a heat exchange flow channel.

6. The battery pack according to claim 5, characterized in that, in, The flow channel plate is welded to the lower shell by friction stir welding.

7. The battery pack according to claim 1, characterized in that, The cavity is provided with at least one first partition beam extending along a first direction; wherein the first partition beam is used to divide the cavity into multiple sub-cavities.

8. The battery pack according to claim 7, characterized in that, At least one second partition beam extending along a second direction is provided within the accommodating cavity; The first direction and the second direction are orthogonal.

9. A battery pack, characterized in that, include: Top cover plate, lower shell, bottom protective plate, outer side beams, and flow channel plate; The upper cover plate is placed on the lower housing and together with the lower housing, they enclose a receiving cavity; The bottom protective plate is located on the side of the lower housing opposite to the upper cover plate; The upper cover plate includes an outward flange, the lower housing includes an outward flange, and the bottom protective plate includes an outward flange; the outward flanges of the cover plate, the housing, and the protective plate are stacked sequentially. The outer edge beam is located between the outer flange of the shell and the outer flange of the protective plate, and its extension direction is consistent with that of the outer flange of the shell; The outer flange of the cover plate is provided with at least one cover plate mounting hole, the outer flange of the shell is provided with at least one shell mounting hole, the outer flange of the guard plate is provided with at least one guard plate mounting hole, and the outer side beam is provided with at least one side beam mounting hole. The mounting holes of the cover plate, the mounting holes of the shell, the mounting holes of the protective plate, and the mounting holes of the side beam are one-to-one and coaxially arranged. The coaxial mounting holes of the cover plate, the mounting holes of the shell, the mounting holes of the protective plate, and the mounting holes of the side beam are used to be mounted to the same mounting point through the same connector. The flow channel plate is disposed between the lower shell and the bottom protective plate, and together with the lower shell, they enclose a heat exchange flow channel.

10. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-8 or 9.

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