Battery, battery box body and power utilization device

Abstract

The utility model discloses a battery, a battery box body and an electric device. The battery comprises a battery box body which comprises a bottom plate; the supporting beam is connected to one side of the bottom plate, and a containing space with an opening is defined by the supporting beam and the bottom plate; the battery monomer is arranged in the accommodating space; the first heat exchange plate covers the opening so as to seal the opening, the first heat exchange plate is provided with a first mounting part, the first mounting part is attached to the supporting beam, and the attaching position is arranged in a sealed mode; and the first heat exchange plate exchanges heat with the battery monomers. In this way, the number of parts of the battery box body and the battery can be reduced, the assembly process and weight are simplified, and the energy density of the battery is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery, a battery box body, and an electrical device. Background Art

[0002] With the development of battery technology, batteries are applied in more and more fields and gradually replace traditional petrochemical energy in fields such as automotive power. A battery can store chemical energy and controllably convert the chemical energy into electrical energy. In a recyclable battery, after discharging, the active substances can be activated by charging and continue to be used.

[0003] In related technologies, a battery box body is composed of a bottom plate, a water-cooling plate, a support beam, and a cover plate. The water-cooling plate is arranged on the bottom plate, and the cover plate is connected to the support beam through fasteners and seals to seal the accommodation space surrounded by the bottom plate and the support beam. This box body structure has more components, which is not conducive to the weight reduction, process simplification, and miniaturization (or energy density improvement) of the battery. Summary of the Utility Model

[0004] In view of the above problems, the present application provides a battery, a battery box body, and an electrical device to reduce the number of components of the battery box body and the battery, simplify the assembly process and weight, and improve the energy density of the battery.

[0005] In a first aspect, the present application provides a battery, which includes: a battery box body, including: a bottom plate; a support beam, connected to one side of the bottom plate and enclosing with the bottom plate to form an accommodation space with an opening; battery cells, arranged in the accommodation space; a first heat exchange plate, covering the opening to close the opening, the first heat exchange plate having a first installation portion, the first installation portion fitting with the support beam and being hermetically connected at the fitting position; the first heat exchange plate exchanges heat with the battery cells. The first heat exchange plate covers the opening, fits with the support beam and is hermetically connected, so as to close the opening, which can improve the sealing performance of the battery box body and the battery, and the heat exchange efficiency between the battery cells and the first heat exchange plate; further, the first heat exchange plate is connected to the support beam as a cover plate, without additionally setting a cover plate, and the first heat exchange plate is directly hermetically connected to the support beam without using fasteners and seals to achieve the sealing connection therebetween. Therefore, the number of components of the battery box body and the battery can be reduced, the assembly process and weight can be simplified, and a larger accommodation space can be obtained. Therefore, the energy density of the battery can also be improved.

[0006] In some embodiments, the support beam and the first installation portion are welded. Welding the support beam and the first installation portion of the first heat exchange plate can form a melt during the welding process, and after the melt solidifies, it can connect the support beam and the first installation portion, which can not only improve the stability between the support beam and the first heat exchange plate, but also improve the sealing performance between the support beam and the first heat exchange plate, thereby improving the reliability of the battery box body and the battery.

[0007] In some embodiments, the first mounting portion covers the end face of the support beam away from the bottom plate and is welded to the support beam. Covering the first mounting portion on the end face of the support beam away from the bottom plate can increase the distance between the first heat exchange plate and the bottom plate, thereby increasing the volume of the accommodation space and further increasing the energy density of the battery.

[0008] In some embodiments, one end of the support beam is connected to the bottom plate; a welding groove is formed at the end of the support beam away from the bottom plate, the first mounting portion is disposed in the welding groove and is welded to the groove wall of the welding groove; the end face of the first heat exchange plate away from the bottom plate is flush with the end face of the support beam away from the bottom plate. Providing a welding groove at the end of the support beam away from the bottom plate and disposing the first mounting portion of the first heat exchange plate in the welding groove and welding it to the groove wall can increase the welding area between the first mounting portion and the support beam and improve the connection stability between the first heat exchange plate and the support beam. And connecting the first heat exchange plate to the welding groove on the support beam, with the end face of the first heat exchange plate away from the bottom plate being flush with the end face of the support beam away from the bottom plate, can reduce the stacking height of the battery box body and reduce the volume of the battery.

[0009] In some embodiments, the welding groove is located at the end of the support beam away from the bottom plate and penetrates through to the accommodation space. Disposing the welding groove at the end of the support beam away from the bottom plate can simplify the preparation process of the support beam and enable the first heat exchange plate to be at least partially stacked on the support beam, which can improve the support effect of the support beam on the first heat exchange plate and thus improve the reliability of the entire battery box body and the battery.

[0010] In some embodiments, a convex portion is formed on the first side face of the end of the support beam away from the bottom plate facing the accommodation space, and a welding groove is formed between the second side face of the convex portion away from the bottom plate and the first side face. Forming the welding groove through the convex portion extending towards the accommodation cavity can increase the strength of the support beam.

[0011] In some embodiments, the end face of the end of the support beam away from the bottom plate is planar, and the first mounting portion is welded to the plane. The end face of the support beam for welding the first mounting portion is planar, and the first mounting portion is welded to this plane, which can increase the connection stability between the support beam and the first heat exchange plate.

[0012] In some embodiments, the support beam includes: an expansion beam connected to the end region of the bottom plate; a frame beam connected to the side region of the bottom plate; the expansion beam and / or the frame beam are welded to the first mounting portion. Welding the expansion beam and / or the frame beam to the first mounting portion of the first heat exchange plate can increase the energy absorption effect of the expansion beam on the first heat exchange plate and reduce the risk of the first heat exchange plate being damaged and leaking the heat exchange medium and the sealing performance of the accommodation space being reduced.

[0013] In some embodiments, the support beam further includes: a middle cross beam, which is welded to the middle area of the bottom plate close to the accommodation space. The middle cross beam can improve the support effect of the support beam on the first heat exchange plate and the bottom plate, enhance the structural strength of the battery box, and can also divide the accommodation space into multiple sub-spaces, reducing the interference between battery cells located in different sub-spaces. Therefore, the middle cross beam can improve the reliability of the battery box and the battery.

[0014] In some embodiments, the support beam is also welded to the bottom plate. By welding the support beam to the bottom plate, a melt can be formed during the welding process, and after the melt solidifies, it can connect the support beam and the bottom plate, which can not only improve the stability between the support beam and the bottom plate, but also enhance the sealing performance between the support beam and the bottom plate, thereby improving the reliability of the battery box and the battery.

[0015] In some embodiments, the battery cell has a peripheral wall, a first end wall, and a second end wall. The peripheral wall encloses a cylindrical structure with openings at both ends, and the first end wall and the second end wall are respectively arranged at both ends of the peripheral wall and close the corresponding openings; at least one wall surface of the peripheral wall faces the first heat exchange plate and exchanges heat with the first heat exchange plate. By arranging at least one wall surface of the peripheral wall of the battery cell to face the first heat exchange plate, the heat exchange area between the battery cell and the first heat exchange plate can be increased, thereby improving the reliability of the battery.

[0016] In some embodiments, the battery cell further has a positive electrode post and a negative electrode post; the positive electrode post and the negative electrode post are respectively arranged on the first end wall and the second end wall; or, both the positive electrode post and the negative electrode post are arranged on the first end wall or the second end wall; the first end wall and the second end wall are spaced apart in a first direction, the first heat exchange plate and the bottom plate are spaced apart in a second direction, and the first direction and the second direction are perpendicular. With this structure, the battery cell can be arranged in the accommodation space in a lying manner, enabling the side surface of the battery cell to exchange heat with the first heat exchange plate, increasing the installation stability of the battery cell in the accommodation space, and increasing the heat exchange area between the battery cell and the first heat exchange plate, thereby improving the reliability of the battery.

[0017] In some embodiments, the battery further includes a second heat exchange plate, which is arranged between the bottom plate and the battery cell and exchanges heat with the battery cell; the second heat exchange plate is hermetically connected to the support beam. The second heat exchange plate increases the heat exchange efficiency between the battery cell and the battery box, thereby improving the reliability of the battery.

[0018] In some embodiments, the second heat exchange plate has a second mounting portion, and the second mounting portion fits with the support beam and is hermetically connected at the fitting portion. The second heat exchange plate fits and is hermetically connected to the support beam, which can improve the sealing performance of the battery box and the battery, and the heat exchange efficiency between the battery cell and the second heat exchange plate.

[0019] Second aspect, the present application provides a battery box body, which includes: a bottom plate; a support beam connected to one side of the bottom plate and enclosing a receiving space with an opening with the bottom plate; a first heat exchange plate covering the opening to close the opening, and the first heat exchange plate has a first mounting portion, the first mounting portion is attached to the support beam and is hermetically connected at the attachment portion; the first heat exchange plate exchanges heat with the battery cell. The first heat exchange plate covers the opening, and the first heat exchange plate is attached to and hermetically connected to the support beam to close the opening, which can improve the sealing performance of the battery box body and the battery, and the heat exchange efficiency between the battery cell and the first heat exchange plate; further, the first heat exchange plate is connected to the support beam as a cover plate, without the need to additionally provide a cover plate, and the first heat exchange plate is directly hermetically connected to the support beam without using fasteners and seals to achieve the sealing connection between the two, so the number of components of the battery box body and the battery can be reduced, the assembly process and weight can be simplified, and a larger receiving space can be obtained, so the energy density of the battery can also be improved.

[0020] In some embodiments, the support beam and the first mounting portion are welded. Welding the support beam and the first mounting portion of the first heat exchange plate, the welding process can form a melt, and after the melt solidifies, it can connect the support beam and the first mounting portion, which can not only improve the stability between the support beam and the first heat exchange plate, but also improve the sealing performance between the support beam and the first heat exchange plate, thereby improving the reliability of the battery box body and the battery.

[0021] In some embodiments, the first mounting portion covers the end face of the end of the support beam facing away from the bottom plate and is welded to the support beam. Covering the first mounting portion on the end face of the end of the support beam facing away from the bottom plate can increase the distance between the first heat exchange plate and the bottom plate, thereby increasing the volume of the receiving space and further increasing the energy density of the battery.

[0022] In some embodiments, one end of the support beam is connected to the bottom plate; a welding groove is formed at the end of the support beam facing away from the bottom plate, the first mounting portion is arranged in the welding groove and is welded to the groove wall of the welding groove; the end face of the first heat exchange plate facing away from the bottom plate is flush with the end face of the support beam facing away from the bottom plate. Arranging a welding groove at the end of the support beam facing away from the bottom plate, and arranging the first mounting portion of the first heat exchange plate in the welding groove and welding it to the groove wall can increase the welding area between the first mounting portion and the support beam and improve the connection stability between the first heat exchange plate and the support beam. And connecting the first heat exchange plate to the welding groove on the support beam, and setting the end face of the first heat exchange plate facing away from the bottom plate to be flush with the end face of the support beam facing away from the bottom plate can reduce the stacking height of the battery box body and reduce the volume of the battery.

[0023] In a third aspect, the present application provides an electrical device including the above battery. The first heat exchange plate covers the opening, and the first heat exchange plate is attached to and hermetically connected to the support beam to close the opening, which can improve the sealing performance of the battery box and the battery, and the heat exchange efficiency between the battery cell and the first heat exchange plate. Further, the first heat exchange plate is connected to the support beam as a cover plate, eliminating the need for an additional cover plate, and the first heat exchange plate is directly hermetically connected to the support beam without using fasteners or seals to achieve the sealing connection therebetween. Therefore, the number of components of the battery box and the battery can be reduced, the assembly process and weight can be simplified, and a larger accommodation space can be obtained, thus also improving the energy density of the battery.

[0024] In the battery provided by the present application, the battery box includes a bottom plate, a support beam, and a first heat exchange plate. The support beam is connected to one side of the bottom plate and encloses a containing space with an opening together with the bottom plate. The battery cell is installed in the containing space. The first heat exchange plate covers the opening, and the first heat exchange plate is attached to and hermetically connected to the support beam to close the opening, which can improve the sealing performance of the battery box and the battery, and the heat exchange efficiency between the battery cell and the first heat exchange plate. Further, the first heat exchange plate is connected to the support beam as a cover plate, eliminating the need for an additional cover plate, and the first heat exchange plate is directly hermetically connected to the support beam without using fasteners or seals to achieve the sealing connection therebetween. Therefore, the number of components of the battery box and the battery can be reduced, the assembly process and weight can be simplified, and a larger accommodation space can be obtained, thus also improving the energy density of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0026] Figure 1 is a schematic structural diagram of a vehicle according to one or more embodiments;

[0027] Figure 2 is an exploded structural diagram of a battery according to one or more embodiments;

[0028] Figure 3 is a schematic structural diagram of a battery according to one or more embodiments;

[0029] Figure 4 is Figure 3 a schematic view of the other side of the battery box shown;

[0030] Figure 5 is a schematic structural diagram of a battery cell, the first heat exchange plate, and the support beam in a battery box according to one or more embodiments;

[0031] Figure 6 is Figure 5 a top view schematic diagram of the illustrated embodiment;

[0032] Figure 7 is Figure 6 a bottom view schematic diagram of the illustrated embodiment;

[0033] Figure 8 is Figure 6 a side view schematic diagram of the illustrated embodiment;

[0034] Figure 9 is a schematic diagram of the structure of the first heat exchange plate and the support beam in the battery box according to one or more embodiments;

[0035] Figure 10 is Figure 9 a sectional view schematic diagram of the illustrated embodiment along A-A;

[0036] Figure 11 is a schematic diagram of the structure of the first heat exchange plate and the support beam in the battery box according to one or more embodiments;

[0037] Figure 12 is Figure 11 a sectional view schematic diagram of the illustrated embodiment along B-B;

[0038] Figure 13 is Figure 8 an enlarged schematic diagram of the structure A in the implementation;

[0039] Figure 14 is a schematic diagram of the structure of the battery cell, the first heat exchange plate, the second heat exchange plate and the support beam in the battery box according to one or more embodiments.

[0040] The reference numerals in the specific embodiments are as follows:

[0041] Vehicle 1000a, battery 100a, controller 200a, motor 300a, battery cell 1, box 10a, first part 11a, second part 12a, bottom plate 31, support beam 32, first heat exchange plate 33, welding groove 322, protrusion 302, expansion beam 323, frame beam 324, first side wall a, third side wall c, second side wall b, fourth side wall d, support rib e; first mounting portion 301, second heat exchange plate 34. Specific Embodiments

[0042] Hereinafter, embodiments of the technical solutions of the present application will be described in detail with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0044] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0045] In the description of the embodiments of this application, the term "plurality" means two or more (including two). Similarly, "multiple groups" means two or more groups (including two groups), and "multiple pieces" means two or more pieces (including two pieces).

[0046] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of this application.

[0047] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0048] In the description of the embodiments of this application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0049] With the development of battery technology, batteries are applied in more and more fields and gradually replace traditional petrochemical energy in fields such as automotive power. A battery can store chemical energy and controllably convert the chemical energy into electrical energy. In a recyclable battery, after discharging, the active substances can be activated by charging and continue to be used.

[0050] The energy density and weight reduction requirements of batteries are getting higher and higher. Through multifunctional integrated design as much as possible, the same structure can perform dual or multiple functions, and the integrated design can also achieve the purpose of weight reduction. In related technologies, a battery box body is composed of a bottom plate, a water-cooling plate, a support beam and a cover plate. The water-cooling plate is arranged on the bottom plate, and the cover plate is hermetically locked to the support beam through fasteners and seals to seal the accommodation space surrounded by the bottom plate and the support beam. This box body structure has more components, which is not conducive to the weight reduction, process simplification and miniaturization (or energy density improvement) of the battery.

[0051] Based on the above considerations, the present application provides a battery, a battery box body and an electrical device. Among them, the battery box body includes a bottom plate, a support beam and a heat exchange plate. The support beam is connected to one side of the bottom plate and encloses an accommodation space with an opening. The battery cells are installed in the accommodation space. The first heat exchange plate covers the opening. The first heat exchange plate is attached to and hermetically connected to the support beam to close the opening, which can improve the sealing performance of the battery box body and the battery, and the heat exchange efficiency between the battery cells and the first heat exchange plate. Further, the first heat exchange plate is connected to the support beam as a cover plate, without the need to additionally provide a cover plate, and the first heat exchange plate is directly hermetically connected to the support beam without using fasteners and seals to achieve the sealing connection between the two. Therefore, the number of components of the battery box body and the battery can be reduced, the assembly process and weight can be simplified, and a larger accommodation space can be obtained. Therefore, the energy density of the battery can also be improved.

[0052] The battery, battery box body and electrical device disclosed in the embodiments of the present application can be used in electrical devices using the battery as a power source or various energy storage systems using the battery as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy and an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle and a spaceship, etc.

[0053] For the convenience of description in the following embodiments, a vehicle 1000a, which is an electrical device according to an embodiment of the present application, is taken as an example for description.

[0054] Please refer to Figure 1, the vehicle 1000a can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A battery 100a is disposed inside the vehicle 1000a, and the battery 100a can be disposed at the bottom, the head, or the tail of the vehicle 1000a. The battery 100a can be used to supply power to the vehicle 1000a. For example, the battery 100a can serve as the operating power source of the vehicle 1000a. The vehicle 1000a can also include a controller 200a and a motor 300a. The controller 200a is used to control the battery 100a to supply power to the motor 300a, for example, to meet the working power requirements during the start, navigation, and driving of the vehicle 1000a.

[0055] In some embodiments of the present application, the battery 100a can not only serve as the operating power source of the vehicle 1000a, but also serve as the driving power source of the vehicle 1000a, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000a.

[0056] In some embodiments, the battery 100a can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0057] The battery 100a mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0058] In the embodiments of the present application, the battery can be a secondary battery. A secondary battery refers to a battery that can activate the active material through charging after discharging and can be used continuously. The battery can also be a primary battery.

[0059] The battery includes but is not limited to lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0060] In some embodiments, the battery 100a can be a battery module. When there are multiple battery cells 1, the multiple battery cells 1 are arranged and fixed to form a battery module.

[0061] In some embodiments, please refer to Figure 2 , the battery 100a can be a battery pack. The battery pack includes a battery box 10a and battery cells 1. The battery cells 1 or the battery module are accommodated in the battery box 10a.

[0062] In some embodiments, the battery box 10a can be a part of the chassis structure of the vehicle 1000a. For example, a part of the battery box 10a can become at least a part of the floor of the vehicle 1000a, or a part of the battery box 10a can become at least a part of the cross beam and longitudinal beam of the vehicle 1000a.

[0063] Please refer to Figure 2 , the battery 100a includes a battery box body 10a and battery cells 1, and the battery cells 1 are accommodated in the battery box body 10a. Among them, the battery box body 10a is used to provide an accommodation space for the battery cells 1, and the box body 10a can adopt various structures. In some embodiments, the battery box body 10a may include a first part 11a and a second part 12a, the first part 11a and the second part 12a cover each other, and the first part 11a and the second part 12a jointly define an accommodation space for accommodating the battery cells 1. The second part 12a may be a hollow structure with one end open, and the first part 11a may be a plate-like structure. The first part 11a covers the open side of the second part 12a so that the first part 11a and the second part 12a jointly define an accommodation space; the first part 11a and the second part 12a may also both be hollow structures with one side open, and the open side of the first part 11a covers the open side of the second part 12a. Of course, the battery box body 10a formed by the first part 11a and the second part 12a can be of various shapes, such as a cylinder, a cuboid, etc.

[0064] In the battery 100a, there may be multiple battery cells 1, and the multiple battery cells 1 can be connected in series, parallel or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 1. The multiple battery cells 1 can be directly connected in series, parallel or in a mixed connection together, and then the whole formed by the multiple battery cells 1 is accommodated in the battery box body 10a; of course, the battery 100a can also be in the form of multiple battery cells 1 first connected in series, parallel or in a mixed connection to form battery modules, and then the multiple battery modules are connected in series, parallel or in a mixed connection to form a whole and are accommodated in the battery box body 10a. The battery 100a may further include other structures. For example, the battery 100a may further include a busbar component for realizing the electrical connection among the multiple battery cells 1.

[0065] In some embodiments, as Figures 3 to 8 、 Figure 12 shown, the battery 100a includes a battery box body 10a and battery cells 1. Among them, the battery box body 10a includes a bottom plate 31, a support beam 32 and a first heat exchange plate 33. The support beam 32 is connected to one side of the bottom plate 31, and the support beam 32 and the bottom plate 31 enclose an accommodation space with an opening; the first heat exchange plate 33 is covered at the opening to close the opening. The first heat exchange plate 33 has a first mounting portion 301, and the first mounting portion 301 is attached to the support beam 32 and is hermetically connected at the attachment portion; the battery cells 1 are arranged in the accommodation space.

[0066] Among them, the support beam 32 is connected to one side of the bottom plate 31 to enclose a receiving space with an opening on one side of the bottom plate 31. The bottom plate 31 can serve as the bottom wall of the receiving space, the support beam 32 can serve as the side wall of the receiving space, and the opening is located at the top of the receiving space. The receiving space is used to install the battery cell 1, and the battery cell 1 can be loaded and unloaded through the opening.

[0067] The first heat exchange plate 33 covers the opening. The first heat exchange plate 33 is attached and sealed to the support beam 32 to close the opening, which can improve the sealing performance of the battery box 10a and the battery 100a, and the heat exchange efficiency between the battery cell 1 and the first heat exchange plate 33; further, the first heat exchange plate 33 is connected to the support beam 32 as a cover plate, eliminating the need for an additional cover plate, and the first heat exchange plate 33 is directly and sealedly connected to the support beam 32 without using fasteners and seals to achieve the sealing connection between the two. Therefore, the number of components of the battery box 10a and the battery 100a can be reduced, the assembly process and weight can be simplified, and a larger receiving space can be obtained. Therefore, the energy density of the battery 100a can also be improved.

[0068] Among them, the heat exchange plate 33 is a component or assembly for heat exchange. It can include a multi-channel structure that uses a liquid medium or a gas medium for heat exchange, including a multi-channel or fin structure that can actively or passively conduct heat exchange. The heat exchange plate 33 can also be configured to adjust the temperature of the battery 100a by controlling the temperature of the heat exchange plate 33 itself or the medium contained therein. The heat exchange plate 33 can heat up or cool down the battery 100a based on actual needs. The heat exchange plate 33 can be made of a material with good thermal conductivity such as metal, non-metal, or alloy. The shape of the heat exchange plate 33 can be designed according to the placement space position to be suitable for full heat exchange.

[0069] In some embodiments, the support beam 32 is welded to the first mounting portion 301.

[0070] In this embodiment, the support beam 32 is welded to the first mounting portion 301 of the first heat exchange plate 33. During the welding process, a molten body can be formed, and after the molten body solidifies, the support beam 32 and the first mounting portion 301 can be connected, which can not only improve the stability between the support beam 32 and the first heat exchange plate 33, but also improve the sealing performance between the support beam 32 and the first heat exchange plate 33, thereby improving the reliability of the battery box 10a and the battery 100a.

[0071] In some embodiments, the support beam 32 and the first mounting portion 301 can be connected by friction stir welding (FSW) or laser welding.

[0072] In some embodiments, the support beam 32 and the first mounting portion 301 may also be fastened and sealed by means of gluing or the like.

[0073] In some embodiments, the first mounting portion 301 covers the end face of the end of the support beam 32 facing away from the bottom plate 31, and is welded to the support beam 32.

[0074] In this embodiment, covering the first mounting portion 301 on the end face of the end of the support beam 32 facing away from the bottom plate 31 can increase the distance between the first mounting portion 301 and the bottom plate 31, thereby increasing the volume of the accommodation space, and further increasing the energy density of the battery 100a.

[0075] In some embodiments, one end of the support beam 32 is connected to the bottom plate 31, a welding groove 322 is formed at the end of the support beam 32 facing away from the bottom plate 31, the first mounting portion 301 is disposed in the welding groove 322, and the first heat exchange plate 33 is welded to the groove wall of the welding groove 322; the end face of the heat exchange plate 33 facing away from the bottom plate 31 is flush with the end face of the support beam 32 facing away from the bottom plate 31.

[0076] In this embodiment, a welding groove 322 is provided at the end of the support beam 32 facing away from the bottom plate 31, and the first mounting portion 301 of the first heat exchange plate 33 is disposed in the welding groove 322 and welded to the groove wall, which can increase the welding area between the first mounting portion 301 and the support beam 32 and improve the connection stability between the first heat exchange plate 33 and the support beam 32. And connecting the first heat exchange plate 33 to the welding groove 322 on the support beam 32, and the end face of the first heat exchange plate 33 facing away from the bottom plate 31 is flush with the end face of the support beam 32 facing away from the bottom plate 31, which can reduce the stacking height of the battery box 10a and reduce the volume of the battery 100a.

[0077] The welding groove 322 may be rectangular, with two adjacent sides of the rectangle located on the support beam 32, and the other two adjacent sides of the rectangle being the openings of the welding groove 322, and the opening direction facing the accommodation space and away from the support beam 32.

[0078] In an application scenario, the first mounting portion 301 and the groove wall of the welding groove 322 may be welded by FSW. Among them, FSW heats the joint surface through stirring and rotational friction, and the energy input is relatively uniform, which is suitable for a variety of materials; and FSW has low cost, high production efficiency, and environmental friendliness; FSW controls the welding effect by adjusting parameters such as rotational speed and axial force, is not easy to generate welding defects, and has high welding strength.

[0079] In some embodiments, the support beam 32 can be realized by an extrusion molding process or the like, and the support beam 32 and the welding groove 322 can be integrally formed by an extrusion molding process.

[0080] In some embodiments, the welding groove 322 is located at the end of the support beam 32 away from the bottom plate 31 and penetrates into the accommodation space. Arranging the welding groove 322 at the end of the support beam 32 away from the bottom plate 31 can simplify the manufacturing process of the support beam 32, and enable the first heat exchange plate 33 to be at least partially stacked on the support beam 32, which can improve the supporting effect of the support beam 32 on the first heat exchange plate 33, thereby improving the reliability of the entire battery box 10a and the battery 100a.

[0081] The end face of the first heat exchange plate 33 away from the bottom plate 31 is flush with the end face of the support beam 32 away from the bottom plate 31 to reduce the height of the battery box 10a.

[0082] In some embodiments, as Figure 9 and Figure 10 shown, a convex portion 302 is formed on the first side face of the end of the support beam 32 away from the bottom plate 31 facing the accommodation space, and a welding groove 322 is formed between the second side face of the convex portion 302 away from the bottom plate 31 and the first side face. Forming the welding groove 322 through the convex portion 302 extending towards the accommodation cavity can increase the strength of the support beam 32.

[0083] The end face of the first heat exchange plate 33 away from the bottom plate 31 is flush with the end face of the support beam 32 away from the bottom plate 31 to reduce the height of the battery box 10a.

[0084] In some embodiments, as Figure 11 and Figure 12 shown, the end face of the end of the support beam 32 away from the bottom plate 31 is arranged as a plane, and the first mounting portion 301 is welded to this plane.

[0085] In this embodiment, the end face of the support beam 32 for welding the first mounting portion 301 is arranged as a plane, and the first mounting portion 301 is welded to this plane, which can increase the connection stability between the support beam 32 and the first mounting portion 301.

[0086] In some embodiments, the first heat exchange plate 33 completely covers this end face, which can increase the connection area between the support beam 32 and the first heat exchange plate 33.

[0087] In an application scenario, the first mounting portion 301 and the groove wall of the welding groove 322 can be welded by laser welding. Among them, laser welding is a welding method with high energy density and linear energy input. It heats the material through a concentrated high-energy beam, has a high energy input density, a small heat-affected zone, a fast cooling speed, and has a good weld profile.

[0088] In some embodiments, the support beam 32 includes: an expansion beam 323 and a frame beam 324; wherein, the expansion beam 323 is connected to the end region of the bottom plate 31; the frame beam 324 is connected to the side region of the bottom plate 31; the expansion beam 323 and / or the frame beam 324 are welded to the first mounting portion 301.

[0089] Wherein, one side surface of the bottom plate 31 close to the accommodation space includes an end region, a side region, and an intermediate region surrounded by the end region and the side region; the expansion beam 323 is connected to the end region, the frame beam 324 is connected to the side region, and the middle region is used to form the accommodation space.

[0090] The expansion beam 323 and the frame beam 324, as the main energy-absorbing components of the battery box 10a, are crucial for the stable and reliable operation of the battery box 10a and the battery 100a.

[0091] In this embodiment, the expansion beam 323 and / or the frame beam 324 are welded to the first mounting portion 301 of the first heat exchange plate 33, which can increase the energy-absorbing effect of the expansion beam 323 on the first heat exchange plate 33, and reduce the risk of the heat exchange medium leaking due to damage to the heat exchange plate 33 and the reduction of the sealing performance of the accommodation space.

[0092] In some embodiments, as Figure 8 , Figure 12 shown, the expansion beam 323 includes a first side wall a and a second side wall b arranged at intervals in the height direction. The first side wall a is attached and sealed to the first mounting portion 301, and the second side wall b is sealed to the bottom plate 31; the expansion beam 323 further includes a third side wall c and a fourth side wall d arranged at intervals in the width direction. The first side wall a, the third side wall c, the second side wall b, and the fourth side wall d are sequentially connected end to end to form a frame structure of the expansion beam 323; the expansion beam 323 further includes support ribs e arranged inside the frame structure and connected to the frame structure. The support ribs e can improve the structural strength of the expansion beam 323, and the frame structure can reduce the weight of the expansion beam 323.

[0093] In some embodiments, the support ribs e include a plurality of brackets. Some brackets are arranged parallel to the height direction, some brackets are arranged parallel to the width direction, and the first side wall a, the third side wall c, the second side wall b, the fourth side wall d, and the brackets all extend along the length direction of the expansion beam 323.

[0094] In some embodiments, the expansion beam 323 is arranged in an L-shaped frame, and the outer side wall of the L-shaped frame is provided with an inclined surface to increase the structural strength of the L-shaped frame.

[0095] In some embodiments, the support beam 32 further includes: a middle cross beam, which is welded to the middle region of the bottom plate 31 close to the accommodation space.

[0096] Among them, both ends of the middle cross beam are respectively connected to the frame beam 324. For example, they can be connected by welding, riveting, fasteners, gluing, etc.

[0097] In this embodiment, the middle cross beam can improve the supporting effect of the support beam 32 on the first heat exchange plate 33 and the bottom plate 31, improve the structural strength of the battery box body 10a, and can also divide the accommodation space into multiple sub-spaces, reducing the interference between the battery monomers 1 located in different sub-spaces. Therefore, the middle cross beam of this embodiment can improve the reliability of the battery box body 10a and the battery 100a.

[0098] In some embodiments, the battery box body 10a may include a first heat exchange plate 33. The first heat exchange plate 33 closes the accommodation space, that is, the outer peripheral area or the end of the heat exchange plate 33 is connected to the expansion beam 323 and the frame beam 324.

[0099] In some embodiments, the battery box body 10a may include multiple first heat exchange plates 33. The accommodation space includes multiple spaced-apart sub-spaces. A single first heat exchange plate 33 can close a single or multiple sub-spaces, and a single heat exchange plate 33 is also connected to the middle cross beam.

[0100] In some embodiments, a protective layer may also be provided on the first heat exchange plate 33. Among them, the protective layer may include at least one of a heat insulation layer, a protective layer, a buffer layer, and a sealing layer.

[0101] In one embodiment, the support beam 32 is also welded to the bottom plate 31.

[0102] In this embodiment, the support beam 32 is welded to the bottom plate 31. During the welding process, a molten body can be formed, and after the molten body solidifies, it can connect the support beam 32 and the bottom plate 31, which can not only improve the stability between the support beam 32 and the bottom plate 31, but also improve the sealing performance between the support beam 32 and the bottom plate 31, thereby improving the reliability of the battery box body 10a and the battery 100a.

[0103] In some embodiments, the support beam 32 and the bottom plate 31 can be connected by FSW or laser welding.

[0104] In some embodiments, the support beam 32 and the bottom plate 31 can also be firmly connected by gluing, fasteners, riveting, etc.

[0105] In some embodiments, the battery cell 1 has a peripheral wall, a first end wall, and a second end wall. The peripheral wall encloses a cylindrical structure with openings at both ends. The first end wall and the second end wall are respectively disposed at both ends of the peripheral wall and close the corresponding openings. At least one wall surface of the peripheral wall faces the first heat exchange plate 33 and exchanges heat with the first heat exchange plate 33. By arranging at least one wall surface of the peripheral wall of the battery cell 1 to face the first heat exchange plate 33, the heat exchange area between the battery cell 1 and the first heat exchange plate 33 can be increased, thereby improving the reliability of the battery 100a.

[0106] In some embodiments, the battery cell 1 further has a positive electrode post and a negative electrode post; the positive electrode post and the negative electrode post are respectively disposed on the first end wall and the second end wall; alternatively, both the positive electrode post and the negative electrode post are disposed on the first end wall or the second end wall; the first end wall and the second end wall are spaced apart in a first direction, the first heat exchange plate 33 and the bottom plate 31 are spaced apart in a second direction, and the first direction and the second direction are perpendicular. With this structure, the battery cell 1 can be arranged in a lying manner in the accommodation space, so that the side surface of the battery cell 1 exchanges heat with the first heat exchange plate 33, which can increase the installation stability of the battery cell 1 in the accommodation space and increase the heat exchange area between the battery cell 1 and the first heat exchange plate 33, thereby improving the reliability of the battery.

[0107] In some embodiments, as Figure 13 shown, the battery 100a further includes a second heat exchange plate 34. The second heat exchange plate 34 is disposed between the bottom plate 31 and the battery cell 1 and exchanges heat with the battery cell 1; the second heat exchange plate 34 is hermetically connected to the support beam 32. By means of the second heat exchange plate 34, the heat exchange efficiency between the battery cell 1 and the battery box 10a is increased, thereby improving the reliability of the battery 100a.

[0108] In some embodiments, the second heat exchange plate 34 has a second mounting portion, and the second mounting portion fits with the support beam 32 and is hermetically connected at the fitting portion. The second heat exchange plate 34 fits and is hermetically connected to the support beam 32, which can improve the sealing performance of the battery box 10a and the battery 100a, and the heat exchange efficiency between the battery cell 1 and the second heat exchange plate 34.

[0109] The connection manner and structure between the second heat exchange plate 34 and the support beam 32 can refer to the above embodiments.

[0110] In some embodiments, the opposite two wall surfaces of the peripheral wall of the battery cell 1 are respectively fixedly connected to the first heat exchange plate 33 and the bottom plate 31, which can increase the structural stability of the battery 100a and enable the battery 100a to become a standard module, which can be adapted to various types of electrical devices.

[0111] While the first heat exchange plate 33 replaces the traditional upper cover, the first heat exchange plate 33 and the battery cell 1 can be fixed by means such as gluing, etc., and has the characteristic of being non-removable. Therefore, the battery cell 1 and the support beam 32 are connected and sealed by welding processes such as FSW, eliminating traditional fasteners and sealing gaskets and other parts, improving the structural sealing performance, saving sealing gaskets, and enabling the battery 100a to have the function of a standard module, which can be adapted to different vehicle models, etc.

[0112] Of course, in other embodiments, the setting manner of the battery cell 1 may not be limited.

[0113] The battery 100a further includes other devices, such as bus bars, electrical connectors, battery management systems, etc. The heat exchange plate 33, as the upper cover of the battery box 10a, can not only seal the battery cell 1 in the battery box 10a, but also seal these devices in the battery box 10a.

[0114] In some embodiments, in order to save the process and heat exchange medium, the medium flow channels may be provided only in the area of the first heat exchange plate 33 corresponding to the battery cell 1.

[0115] In some embodiments, the support beam 32 may be used as the outermost structure of the battery box 10a. The above-mentioned other devices are arranged in the accommodation space, and the battery cell 1 and the above-mentioned other devices are sealed by sealing the first heat exchange plate 33 and the support beam 32.

[0116] In some embodiments, the battery box 10a further forms a side wall outside the support beam 32 (the side wall is sealed with the bottom plate). The above-mentioned other devices may be arranged between the side wall and the support beam 32; the heat exchange plate 33 further extends towards the side wall and is sealed with the end of the side wall to seal the above-mentioned other devices between the side wall and the support beam 32.

[0117] In some embodiments, such as Figures 3 to 8 、 Figure 12As shown, the battery box body 10a includes a bottom plate 31, a support beam 32 and a first heat exchange plate 33. The support beam 32 is connected to one side of the bottom plate 31, and the support beam 32 and the bottom plate 31 enclose a containing space with an opening; the first heat exchange plate 33 covers the opening to close the opening. The first heat exchange plate 33 has a first mounting portion 301. The first mounting portion 301 is attached to the support beam 32 and is hermetically connected at the attachment portion; the battery cell 1 is disposed in the containing space. The first heat exchange plate 33 covers the opening, and the first heat exchange plate 33 is attached to and hermetically connected to the support beam 32 to close the opening, which can improve the sealing performance of the battery box body 10a and the battery 100a, and the heat exchange efficiency between the battery cell 1 and the first heat exchange plate 33; further, the first heat exchange plate 33 is connected to the support beam 32 as a cover plate, without the need to additionally provide a cover plate, and the first heat exchange plate 33 is directly hermetically connected to the support beam 32 without using fasteners and seals to achieve the sealing connection between the two. Therefore, the number of components of the battery box body 10a and the battery 100a can be reduced, the assembly process and weight can be simplified, and a larger containing space can be obtained. Therefore, the energy density of the battery 100a can also be improved.

[0118] In some embodiments, the support beam 32 and the first mounting portion 301 are welded. In this embodiment, the support beam 32 and the first mounting portion 301 of the first heat exchange plate 33 are welded. The welding process can form a melt, and after the melt solidifies, the support beam 32 and the first mounting portion 301 can be connected, which can not only improve the stability between the support beam 32 and the first heat exchange plate 33, but also improve the sealing performance between the support beam 32 and the first heat exchange plate 33, thereby improving the reliability of the battery box body 10a and the battery 100a.

[0119] In some embodiments, the first mounting portion 301 covers the end face of the end of the support beam 32 facing away from the bottom plate 31 and is welded to the support beam 32. In this embodiment, covering the first mounting portion 301 on the end face of the end of the support beam 32 facing away from the bottom plate 31 can increase the distance between the first mounting portion 301 and the bottom plate 31, thereby increasing the volume of the containing space and further increasing the energy density of the battery 100a.

[0120] In some embodiments, one end of the support beam 32 is connected to the bottom plate 31. A welding groove 322 is formed at the end of the support beam 32 facing away from the bottom plate 31. The first mounting portion 301 is disposed in the welding groove 322, and the first heat exchange plate 33 is welded to the groove wall of the welding groove 322. The end face of the heat exchange plate 33 facing away from the bottom plate 31 is flush with the end face of the support beam 32 facing away from the bottom plate 31. In this embodiment, the welding groove 322 is provided at the end of the support beam 32 facing away from the bottom plate 31, and the first mounting portion 301 of the first heat exchange plate 33 is disposed in the welding groove 322 and welded to the groove wall, which can increase the welding area between the first mounting portion 301 and the support beam 32 and improve the connection stability between the first heat exchange plate 33 and the support beam 32. Moreover, by connecting the first heat exchange plate 33 to the welding groove 322 on the support beam 32 and setting the end face of the first heat exchange plate 33 facing away from the bottom plate 31 to be flush with the end face of the support beam 32 facing away from the bottom plate 31, the stacking height of the battery box 10a can be reduced and the volume of the battery 100a can be minimized.

[0121] For other structures of the battery box 10a, reference may be made to the above embodiments.

[0122] In some embodiments, such as Figures 3 to 10 , Figure 12 , the battery box 10a includes a bottom plate 31, a support beam 32, and a first heat exchange plate 33. The support beam 32 is connected to one side of the bottom plate 31, and the support beam 32 and the bottom plate 31 enclose a receiving space with an opening. The first heat exchange plate 33 covers the opening to close the opening. Among them, the support beam 32 includes an expansion beam 323 and a frame beam 324, and the expansion beam 323 and the frame beam 324 are welded to the first heat exchange plate 33.

[0123] The first heat exchange plate 33 covers the opening. The first mounting portion 301 of the first heat exchange plate 33 is attached to and hermetically connected to the expansion beam 323 and the frame beam 324 to close the opening, which can improve the sealing performance of the battery. Further, the first heat exchange plate 33 is connected to the expansion beam 323 and the frame beam 324 as a cover plate, eliminating the need for an additional cover plate. Moreover, the heat exchange plate 33 is directly hermetically connected to the expansion beam 323 and the frame beam 324 without using fasteners or seals to achieve the sealing connection between the two. Therefore, the battery box 10a can reduce the number of components, simplify the assembly process and weight, and obtain a larger receiving space. Thus, the energy density of the battery 100a can also be improved. And the welding setting can improve the structural stability and sealing performance.

[0124] Wherein, welding grooves 322 are provided at one ends of the expansion beam 323 and the frame beam 324 away from the bottom plate 31; one ends of the expansion beam 323 and the frame beam 324 are connected to the bottom plate 31; a part of the first heat exchange plate 33 is arranged in the welding groove, and the heat exchange plate 33 is welded to the groove wall of the welding groove 322; the end face of the first heat exchange plate 33 away from the bottom plate 31 is flush with the end face of the support beam 32 away from the bottom plate 31.

[0125] Wherein, as Figure 8 , Figure 12 shown, the welding groove 322 of the expansion beam 323 is located at the end of the support beam 32 away from the bottom plate 31 and penetrates into the accommodation space; as Figure 10 shown, a convex portion 302 is formed on the first side surface of the frame beam 324 away from the bottom plate 31 facing the accommodation space, and a welding groove 322 is formed between the second side surface of the convex portion 302 away from the bottom plate 31 and the first side surface. The first heat exchange plate 33 and the groove wall of the welding groove 322 can be welded by FSW. The end face of the first heat exchange plate 33 away from the bottom plate 31 is flush with the end face of the support beam 32 away from the bottom plate 31.

[0126] In some embodiments, the welding grooves of the expansion beam 323 and the frame beam 324 and the like can adopt the same structure.

[0127] According to some embodiments of the present application, as Figure 1 shown, the electrical device includes the above-mentioned battery 100a. With such an arrangement, the first heat exchange plate 33 covers the opening, and the first heat exchange plate 33 is attached and sealed to the support beam 32 to close the opening, which can improve the sealing performance of the battery box 10a and the battery 100a, and the heat exchange efficiency between the battery cell 1 and the first heat exchange plate 33; further, the first heat exchange plate 33 is connected to the support beam 32 as a cover plate, without the need to additionally provide a cover plate, and the first heat exchange plate 33 is directly sealed to the support beam 32 without using fasteners and seals to achieve the sealing connection between the two, so the number of components of the battery box 10a and the battery 100a can be reduced, the assembly process and weight can be simplified, and a larger accommodation space can be obtained, so the energy density of the battery 100a can also be improved.

[0128] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery, characterized in that: The battery comprises: Battery box, including: Base plate; A support beam, the support beam is connected to one side of the bottom plate and is enclosed with the bottom plate to form a receiving space with an opening; A battery cell is arranged in the accommodation space; The first heat exchange plate is covered at the opening to close the opening. The first heat exchange plate has a first mounting portion. The first mounting portion is fitted with the support beam and is sealed at the fitting portion. The first heat exchange plate exchanges heat with the battery cell.

2. The battery according to claim 1, characterized in that The support beam is welded to the first mounting portion.

3. The battery according to claim 2, characterized in that The first mounting portion is covered on an end surface of the support beam that is away from the bottom plate and is welded to the support beam.

4. The battery according to claim 3, characterized in that One end of the support beam is connected to the bottom plate; a welding groove is formed at one end of the support beam away from the bottom plate, and the first mounting portion is arranged in the welding groove and welded to the groove wall of the welding groove; The end surface of the first heat exchange plate facing away from the bottom plate is arranged flush with the end surface of the support beam facing away from the bottom plate.

5. The battery according to claim 4, characterized in that The welding groove is located at the end of the support beam away from the bottom plate and passes through the accommodating space.

6. The battery according to claim 4, characterized in that One end of the support beam away from the bottom plate forms a protrusion toward the first side of the accommodating space, and the welding groove is formed between a second side of the protrusion away from the bottom plate and the first side.

7. The battery according to claim 3, characterized in that The end surface of one end of the support beam facing away from the bottom plate is arranged in a plane, and the first mounting portion is welded to the plane.

8. The battery according to any one of claims 1 to 7, characterized in that: The support beam comprises: an expansion beam connected to an end region of the base plate; A frame beam connected to a side area of ​​the bottom plate; The expansion beam and / or the frame beam are welded to the first mounting portion.

9. The battery according to claim 8, characterized in that The support beam further comprises: The middle cross beam is welded to the middle area of ​​the bottom plate close to the accommodating space.

10. The battery according to claim 1, characterized in that The support beam is also welded to the bottom plate.

11. The battery according to claim 1, characterized in that The battery cell has a peripheral wall, a first end wall and a second end wall, the peripheral wall encloses a cylindrical structure with open ends, the first end wall and the second end wall are respectively arranged at the two ends of the peripheral wall and close the corresponding open ends; At least one wall surface of the peripheral wall faces the first heat exchange plate and exchanges heat with the first heat exchange plate.

12. The battery according to claim 11, characterized in that The battery cell also has a positive electrode column and a negative electrode column; The positive electrode column and the negative electrode column are respectively arranged on the first end wall and the second end wall; or, the positive electrode column and the negative electrode column are both arranged on the first end wall or the second end wall; The first end wall and the second end wall are spaced apart along a first direction, the first heat exchange plate and the bottom plate are spaced apart along a second direction, and the first direction is perpendicular to the second direction.

13. The battery according to claim 1, characterized in that The battery further includes a second heat exchange plate, which is disposed between the bottom plate and the battery cell and exchanges heat with the battery cell; the second heat exchange plate is sealed and connected to the support beam.

14. The battery according to claim 13, characterized in that The second heat exchange plate has a second mounting portion, and the second mounting portion is in contact with the support beam, and the contact portion is sealed and connected.

15. A battery box, characterized in that: The battery box comprises: Base plate; A support beam, the support beam is connected to one side of the bottom plate and is enclosed with the bottom plate to form a receiving space with an opening; The first heat exchange plate is covered at the opening to close the opening. The first heat exchange plate has a first mounting portion. The first mounting portion is fitted with the support beam and is sealed at the fitting portion. The first heat exchange plate exchanges heat with the battery cell.

16. The battery case according to claim 15, characterized in that: The support beam is welded to the first mounting portion.

17. The battery case according to claim 16, characterized in that: The first mounting portion is covered on an end surface of the support beam that is away from the bottom plate and is welded to the support beam.

18. The battery case according to claim 17, characterized in that: One end of the support beam is connected to the bottom plate; a welding groove is formed at one end of the support beam away from the bottom plate, and the first mounting portion is arranged in the welding groove and welded to the groove wall of the welding groove; The end surface of the first heat exchange plate facing away from the bottom plate is arranged flush with the end surface of the support beam facing away from the bottom plate.

19. An electrical device, characterized in that: A battery comprising the battery according to any one of claims 1 to 14.

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