Battery device and electric appliance

Abstract

Embodiments of the present application provide a battery device and an electric device. The battery device comprises a box body and a battery cell. The box body has a receiving cavity. The box body comprises a first wall which surrounds one side of the receiving cavity along a first direction. The battery cell is arranged in the receiving cavity. The first wall comprises a body part and a heat exchange part which are connected to each other along a second direction. The heat exchange part has a first cavity which is configured to flow a first heat exchange medium. In the first direction, the heat exchange part has a size which is greater than that of the body part. The first direction intersects the second direction. The present application is conducive to reducing the cost of the battery device.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery device and an electrical appliance. Background Technology

[0002] With the development of new energy technologies, battery devices are being used more and more widely, such as in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools.

[0003] In the development of battery technology, how to reduce the cost of battery devices is a technical problem that urgently needs to be solved. Utility Model Content

[0004] In view of the above problems, this application provides a battery device and an electrical device that helps to reduce the cost of the battery device.

[0005] In a first aspect, this application provides a battery device, comprising: a housing having a receiving cavity, the housing including a first wall surrounding one side of the receiving cavity along a first direction; and a battery cell disposed in the receiving cavity; wherein the first wall includes a body portion and a heat exchange portion interconnected along a second direction, the heat exchange portion having a first cavity configured for the flow of a first heat exchange medium, and in the first direction, the size of the heat exchange portion is larger than the size of the body portion, and the first direction intersects the second direction.

[0006] In some embodiments of the first aspect, the first wall of the housing has a first cavity for the flow of a first heat exchange medium, which enables the first wall to integrate protection and thermal management functions for the battery cells without the need for additional heat exchange structures. This helps to reduce the cost and weight of the battery device. Furthermore, by setting the first wall as a heat exchange section and a body section with different thicknesses, the thickness of the non-thermal management area of ​​the first wall can be reduced, thereby reducing the material used in the first wall, which also helps to reduce the cost and weight of the battery device.

[0007] In some embodiments, the battery cell includes electrode terminals, the first direction is the height direction of the battery cell, and in the first direction, the battery cell has a top end and a bottom end disposed opposite to each other; the battery cell includes a pressure relief mechanism disposed at the bottom end of the battery cell.

[0008] In the above technical solution, by setting the pressure relief mechanism at the bottom of the battery cell, when a battery cell experiences thermal runaway, its pressure relief mechanism can discharge the emissions downwards, thereby improving the reliability of the battery device.

[0009] In some embodiments, along the first direction, the first wall is closer to the bottom end relative to the top end, and in the same projection plane perpendicular to the first direction, the orthographic projection of the pressure relief mechanism falls into the orthographic projection of the body portion.

[0010] In the above technical solution, when a battery cell experiences thermal runaway and releases emissions downwards, the heat exchange section can also slow down the spread of thermal runaway to the surrounding area because the pressure relief mechanism is close to the first wall, so as to prevent other battery cells from also experiencing thermal runaway, which helps to reduce the chain reaction caused by the failure of a battery cell.

[0011] In some embodiments, the side surface of the body portion facing the battery cell along the first direction is located in the same extending plane as the bottom wall of the first cavity. This arrangement facilitates the processing and shaping of the first wall.

[0012] In some embodiments, in a first direction, the surface of the heat exchange portion facing the battery cell protrudes from the surface of the body portion facing the battery cell.

[0013] This configuration allows the heat exchange section to be placed closer to the individual battery cells, enabling better thermal management of the cells and thus improving the performance of both the individual cells and the battery system.

[0014] In some embodiments, in the first direction, the side surface of the heat exchange portion facing away from the battery cell and the side surface of the body portion facing away from the battery cell are located in the same extending plane.

[0015] By setting it in the above manner, the surface of the first wall facing away from the receiving cavity can be made smoother.

[0016] In some embodiments, the first wall is formed by welding multiple wall units along a second direction, each wall unit having a body and a heat exchange part, and the body and heat exchange part in each wall unit are an integral structure.

[0017] In the above technical solution, the main body and the heat exchange part can be an integral extruded structural component with a compact layout, which is conducive to improving space utilization and the connection strength between the two, thereby improving the structural strength of the first wall and thus improving the reliability of the box and battery device.

[0018] In some embodiments, the body portion has a reinforcing structure protruding from at least one side along a first direction.

[0019] The above technical solution is beneficial to improving the structural strength of the main body, which in turn is beneficial to improving the structural strength of the casing and battery device.

[0020] In some embodiments, the battery device further includes a thermal insulation component, which is provided on the side of the body facing the receiving cavity.

[0021] In the above technical solution, the uniformity of temperature inside the cavity can be ensured by incorporating a heat insulation component.

[0022] In some embodiments, the housing further includes a plurality of limiting members. Along a first direction, the plurality of limiting members are all connected to the side of the first wall facing the battery cell. The plurality of limiting members are arranged along a second direction. The battery cell is disposed between two adjacent limiting members and is fixed by the limiting members.

[0023] In the above technical solution, the limiting component can limit the movement of the battery cell along the second direction, which facilitates installation and positioning, and also helps to prevent the battery cell from shifting.

[0024] In some embodiments, each limiting member includes a first limiting portion and a second limiting portion. The battery cell is disposed between two adjacent first limiting portions. Along a first direction, the first limiting portion is connected between the first wall and the second limiting portion, and at least one side of the second limiting portion protrudes from the first limiting portion along a second direction. In the first direction, the second limiting portion abuts against the end of the battery cell facing away from the first wall.

[0025] In the above technical solution, the second limiting part can cooperate with the first wall to limit the displacement of the battery cell in the first direction, and multiple first limiting parts cooperate to limit the displacement of the battery cell in the second direction, which helps to ensure the safety of the battery cell and thus improves the reliability of the battery device.

[0026] In some embodiments, the battery cell has a dimension D in the second direction, and the second limiting portion covers a portion of the battery cell along the first direction, having a dimension L in the second direction, wherein 1 / 100 ≤ D / L ≤ 1 / 5.

[0027] By setting it in the above manner, it is beneficial to ensure the effectiveness of the second limiting part in limiting the battery cell.

[0028] In some embodiments, 3 / 200 ≤ D / L ≤ 3 / 20. This configuration further enhances the limiting effect of the second limiting portion on the battery cell in the first direction.

[0029] In some embodiments, at least one of the first limiting portion and the second limiting portion has a second cavity configured for the flow of a second heat exchange medium.

[0030] By setting it in the above manner, the limiting component can also provide thermal management for the battery cells, which is conducive to improving the performance of the battery cells and thus improving the performance of the battery device.

[0031] In some embodiments, the first limiting portion and the second limiting portion of each limiting member are integral structures, and / or the first limiting portion and the first wall are integral structures, and / or the first limiting portion, the second limiting portion and the first wall are integral structures.

[0032] The above-mentioned setup improves the flexibility of battery device usage.

[0033] In some embodiments, the limiting member further includes a third limiting portion, which is connected to one side of the first limiting portion along the second direction and connected between the first wall and the battery cell along the first direction. The third limiting portion, the first limiting portion, and the first wall enclose a third cavity, which is configured to allow the flow of a third heat exchange medium.

[0034] The above technical solutions can further improve the thermal management efficiency of battery cells, thereby better improving the performance of battery cells and battery devices.

[0035] In some embodiments, the orthographic projection of the first cavity overlaps with the orthographic projection of the third cavity in the same projection plane perpendicular to the first direction.

[0036] In the above technical solution, the first heat exchange medium and the third heat exchange medium can exchange heat to better improve the thermal management efficiency of the battery cells.

[0037] In some embodiments, the first limiting portion and the third limiting portion of each limiting member are integral structures, and / or the first limiting portion, the second limiting portion and the third limiting portion of each limiting member are integral structures, and / or the first limiting portion, the second limiting portion, the third limiting portion and the first wall are integral structures.

[0038] The above-mentioned setup improves the flexibility of battery device usage.

[0039] In some embodiments, the battery device further includes a flexible component, through which the battery cell is connected to the third limiting portion.

[0040] The above-mentioned design facilitates the assembly of battery cells and prevents collisions between battery cells and the third limiting part, thus ensuring the safety of the battery cells.

[0041] In some embodiments, the housing further includes a frame surrounding the circumference of the receiving cavity, and a first wall is welded to the side surface of the frame facing the receiving cavity.

[0042] The above-described configuration facilitates the connection and assembly between the frame and the first wall.

[0043] In some embodiments, the heat exchange portion is welded to the frame; and / or, in a first direction, the side surface of the frame facing away from the battery cell and the side surface of the first wall facing away from the battery cell are located in the same extending plane.

[0044] The layout is reasonable and easy to assemble.

[0045] Secondly, this application provides an electrical device including a battery device according to any embodiment of the first aspect.

[0046] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0047] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0048] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0049] Figure 2 This application provides a schematic diagram of the structure of a battery cell assembly according to some embodiments;

[0050] Figure 3 This application provides an exploded structural diagram of a single battery cell for some embodiments.

[0051] Figure 4 This is a partial structural schematic diagram of a battery device provided in some embodiments of this application;

[0052] Figure 5 A partial cross-sectional view of a battery device provided for some embodiments of this application;

[0053] Figure 6 for Figure 4 Enlarged view of point P in the middle;

[0054] Figure 7 A partial structural schematic diagram of a battery device provided for other embodiments of this application;

[0055] Figure 8 for Figure 4 Enlarged view of point Q;

[0056] Figure 9 for Figure 6 Enlarged view of the middle T section;

[0057] Figure 10 A partial cross-sectional view of a battery device provided for other embodiments of this application.

[0058] The reference numerals in the accompanying drawings for the specific embodiments are as follows:

[0059] 100. Vehicle; 1. Battery unit; 2. Controller; 3. Motor; 4. Battery cell assembly;

[0060] 10. Battery cell; 101. Top end; 102. Bottom end; 11. Casing; 111. End cap; 112. Housing; 12. Electrode assembly; 13. Electrode terminal; 14. Pressure relief mechanism;

[0061] 20. Housing; 201. Receiving cavity; 21. First wall; 211. Main body; 2111. Reinforcing structure; 212. Heat exchange section; 202. First cavity; 2022. Cavity top wall; 2021. Cavity bottom wall;

[0062] 22. Limiting component; 221. First limiting part; 222. Second limiting part; 223. Third limiting part; 203. Third cavity; 2231. Top wall; 2232. Side wall; 23. Frame;

[0063] 30. Thermal insulation components; 40. Flexible components;

[0064] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0065] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. 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.

[0066] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0067] In this application, the reference to "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 in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0068] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0069] 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, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0070] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0071] In this application, "multiple" means two or more (including two).

[0072] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0073] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0074] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0075] In related technologies, the heat exchange structure in battery devices is usually a double-layer plate design, which results in higher costs.

[0076] To address the aforementioned technical problems, this application provides a battery device, including a housing and a battery cell. The housing has a receiving cavity and includes a first wall surrounding one side of the receiving cavity along a first direction. The battery cell is disposed in the receiving cavity. The first wall includes a body portion and a heat exchange portion interconnected along a second direction. The heat exchange portion has a first cavity configured for the flow of a first heat exchange medium. In the first direction, the dimension of the heat exchange portion is larger than the dimension of the body portion, and the first direction intersects the second direction.

[0077] The first wall of the housing has a first cavity for the flow of the first heat exchange medium, which enables the first wall to integrate protection and thermal management functions for the battery cells without the need for additional heat exchange structures. This helps to reduce the cost and weight of the battery device. Furthermore, by setting the first wall as a heat exchange section and a body section with different thicknesses, the thickness of the non-thermal management area of ​​the first wall can be reduced, thereby reducing the material used in the first wall, which also helps to reduce the cost and weight of the battery device.

[0078] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0079] It should be understood that the technical solutions described in the embodiments of this application are not limited to the devices described above, but can also be applied to all devices that use battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0080] For example, such as Figure 1 As shown, Figure 1This is a schematic diagram of the structure of a vehicle 100 according to one embodiment of this application. The vehicle 100 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 100 can have a motor 3, a controller 2, and a battery device 1 installed inside. The controller 2 controls the battery device 1 to supply power to the motor 3. For example, the battery device 1 can be installed at the bottom, front, or rear of the vehicle 100. The battery device 1 can be used to power the vehicle 100. For example, the battery device 1 can serve as the operating power source for the vehicle 100's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 100. In another embodiment of this application, the battery device 1 can not only serve as the operating power source for the vehicle 100 but also as the driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle 100.

[0081] Please see Figure 2 The battery device 1 mentioned in the embodiments of this application may include one or more battery cell assemblies 4 for providing voltage and capacity. The battery cell assembly 4 may include multiple battery cells 10, which are connected in series, parallel, or mixed connection via a busbar.

[0082] In some embodiments, the battery cell assembly 4 is typically formed by arranging multiple battery cells 10.

[0083] As an example, the battery cell assembly 4 can be a battery module, which is formed by arranging and fixing multiple battery cells 10 together. As an example, the battery module can be formed by bundling multiple battery cells 10 together with cable ties.

[0084] Please see Figure 3 The battery cell 10 includes a housing 11 and an electrode assembly 12.

[0085] The outer casing 11 is a component used to form the internal environment of the battery cell 10. The internal environment formed therein can be used to house the electrode assembly 12, as well as the electrolyte and other components. Optionally, the outer casing 11 can be, but is not limited to, made of metallic or non-metallic materials. For example, metallic materials can be copper, aluminum, or stainless steel; non-metallic materials can be polyethylene, polypropylene, or polyvinyl chloride.

[0086] For example, the outer shell 11 can be a steel shell, an aluminum shell, a plastic shell (such as a polypropylene shell), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0087] In some embodiments, the housing 11 can be a sealed structure or a non-sealed structure. As an example, when the housing 11 is a non-sealed structure, it serves to protect the electrode assembly 12, and a sealing bag is included between the housing 11 and the electrode assembly 12. The sealing bag is used to encapsulate the electrode assembly 12 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the housing 11 is a sealed structure, it is used to encapsulate the electrode assembly 12 and the electrolyte, among other components.

[0088] In some embodiments, the housing 11 includes an end cap 111 and a housing 112, the housing 112 having a housing opening, and the end cap 111 covering the housing opening. The housing 112 may have one or more housing openings. The end cap 111 may also be provided one or more.

[0089] The shape of the outer shell 11 can be determined according to the specific shape of the electrode assembly 12. For example, if the electrode assembly 12 is a cuboid structure, a cuboid outer shell can be selected; if the electrode assembly 12 is a cylindrical structure, a cylindrical outer shell can be selected.

[0090] Electrode assembly 12 is a component in the battery cell 10 where an electrochemical reaction occurs, and the housing 11 may contain one or more electrode assemblies 12.

[0091] In some embodiments, the electrode assembly 12 may be cylindrical, flat, or polygonal, etc.

[0092] The electrode assembly 12 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0093] The electrode assembly 12 includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. During the charging and discharging process of the battery cell 10, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0094] like Figure 3 As shown, the battery cell 10 also includes electrode terminals 13.

[0095] The electrode terminal 13 can be provided on the housing 11. Optionally, the end cover 111 can be provided with the electrode terminal 13, or the housing 112 can be provided with the electrode terminal 13, or the end cover 111 and the housing 112 can each be provided with the electrode terminal 13.

[0096] In some embodiments, at least one electrode terminal 13 is provided on the housing 11, and the electrode terminal 13 is electrically connected to the tab of the electrode assembly 12. The electrode terminal 13 can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector.

[0097] Electrode terminal 13 can be electrically connected to electrode assembly 12 for outputting or inputting electrical energy from a single battery cell. Electrode terminal 13 can be electrically connected to electrode assembly 12 by connecting to tabs. The tabs electrically connected to electrode terminal 13 can be either positive or negative tabs.

[0098] As an example, the battery cell 10 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0099] Please see Figure 4 In some embodiments, the battery device 1 may be a battery pack, which includes a housing 20 and one or more battery cell assemblies 4, the battery cell assemblies 4 being housed in the housing 20.

[0100] As an example, the battery cell assembly 4 can be a battery module, and the battery cell assembly 4 can be housed in the housing 20 by fixing the battery module in the housing 20.

[0101] As an example, the battery cell assembly 4 can also be housed in the housing 20 by directly fixing multiple battery cells 10 to the housing 20.

[0102] In some embodiments, the housing 20 may be part of the chassis structure of the vehicle 100. For example, a portion of the housing 20 may be at least a portion of the floor of the vehicle 100, or a portion of the housing 20 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 100.

[0103] The box 20 can be a simple three-dimensional structure such as a cuboid or a cylinder, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids or cylinders. This application embodiment does not limit this.

[0104] Specifically, the housing 20 can be a metal shell made of alloy steel, alloy aluminum, etc., or a composite material shell made of metal and polypropylene, etc.

[0105] Please refer to the following: Figures 4 to 9According to an embodiment of this application, a battery device 1 is provided, including a housing 20 and a battery cell 10. The housing 20 has a receiving cavity 201 and includes a first wall 21 surrounding one side of the receiving cavity 201 along a first direction X. The battery cell 10 is disposed in the receiving cavity 201. The first wall 21 includes a body portion 211 and a heat exchange portion 212 interconnected along a second direction Y. The heat exchange portion 212 has a first cavity 202 configured for the flow of a first heat exchange medium. In the first direction X, the size of the heat exchange portion 212 is larger than the size of the body portion 211. The first direction X intersects the second direction Y.

[0106] In the embodiments of this application, the first direction X can be the height direction of the battery cell 10 or the battery device 1, the second direction Y is the length direction of the battery cell 10 or the battery device 1, and the third direction Z is the width direction of the battery cell 10 or the battery device 1; or, the second direction Y is the width direction of the battery cell 10 or the battery device 1, and the third direction Z is the length direction of the battery cell 10 or the battery device 1.

[0107] There are multiple battery cells 10, which can be arranged along the second direction Y or along the third direction Z.

[0108] The first wall 21, as part of the housing 20, provides protection for the battery cell 10 on one side along the first direction X. The first wall 21 includes a body portion 211 and a heat exchange portion 212 that are interconnected along the second direction Y. Both the body portion 211 and the heat exchange portion 212 are located at one end of the battery cell 10 along the first direction X to provide protection for it along the first direction X.

[0109] The heat exchange section 212 has a first cavity 202 for the flow of a first heat exchange medium, so that the heat exchange section 212 can provide thermal management for one end of the battery cell 10 along the first direction X, so as to keep the temperature of the battery cell 10 within a suitable temperature range and ensure the performance of the battery cell 10.

[0110] The size of the heat exchange section 212 in the first direction X is larger than the size of the body section 211 in the first direction X. That is, the heat exchange section 212 is thicker than the body section 211. In other words, the thickness is only increased at the position where the first cavity 202 is provided on the first wall 21, or the thickness is reduced at the position where the first cavity 202 is not provided on the first wall 21, so as to reduce the material and weight of the first wall 21.

[0111] In some embodiments of this application, the battery device 1 has a first wall 21 of the housing 20 that integrates protection and thermal management functions for the battery cells 10. This eliminates the need for additional heat exchange structures in the battery device 1, which helps reduce the cost and weight of the battery device 1. It also helps improve assembly efficiency and reduce assembly difficulty. Furthermore, by setting the first wall 21 as a heat exchange part 212 and a body part 211 with different thicknesses, the thickness of the non-thermal management area of ​​the first wall 21 can be reduced, thereby reducing the material used in the first wall 21. This helps reduce the cost and weight of the housing 20, and consequently, also helps reduce the cost and weight of the battery device 1.

[0112] Optionally, in the first direction X, the heat exchange portion 212 protrudes from the side surface of the main body portion 211 facing the battery cell 10, such that the size of the heat exchange portion 212 is larger than the size of the main body portion 211. Alternatively, in the first direction X, the heat exchange portion 212 protrudes from the side surface of the main body portion 211 facing away from the battery cell 10.

[0113] In some embodiments, the battery cell 10 can be connected to the heat exchange section 212, bringing the battery cell 10 closer to the first cavity 202, which helps to further improve the thermal management efficiency of the heat exchange section 212 for the battery cell 10. Furthermore, it allows for a more compact and tighter connection between the battery cell 10 and the heat exchange section 212, improving the connection strength between them, thus enhancing the limiting effect of the housing 20 on the battery cell 10, and also improving the structural compactness of the battery device 1.

[0114] The first heat exchange medium can flow within the first cavity 202 to exchange heat with the battery cell 10. The first heat exchange medium can take many forms, such as water, air, phase change material, etc.

[0115] Optionally, the first cavity 202 can be configured as a linear structure, for example, the first cavity 202 extends along a third direction Z. Alternatively, the first cavity 202 can also be configured as a curved structure, wherein the curved structure includes an arc structure and a bent structure.

[0116] In some embodiments, the battery cell 10 may be spaced apart from the body portion 211.

[0117] By setting it in this way, the gap between the battery cell 10 and the body 211 can absorb mechanical impacts from the outside, and the first wall 21 improves the protection of the battery cell 10, thereby helping to improve the reliability and service life of the battery device 1.

[0118] Optionally, the heat exchanger 212 and the body 211 can be an integral extrusion molding structure, or the heat exchanger 212 and the body 211 can be provided separately and then assembled.

[0119] like Figure 3 As shown, optionally, the battery cell 10 includes a pressure relief mechanism 14.

[0120] The pressure relief mechanism 14 is configured to release emissions from the battery cell 10. Emissions from the battery cell 10 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0121] As an example, the internal pressure or temperature of the battery cell 10 is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 10 reaches the predetermined threshold, the pressure relief mechanism 14 is activated or a weak structure in the pressure relief mechanism 14 is broken, thereby forming an opening or channel for the internal pressure or temperature to be released, allowing the discharge to occur. The predetermined threshold varies depending on design requirements. This threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 10.

[0122] The term "actuation" as used in this application refers to the pressure relief mechanism 14 being activated or brought to a certain state, thereby allowing the internal pressure and temperature of the battery cell 10 to be released. The actions performed by the pressure relief mechanism 14 may include, but are not limited to: movement of components in the pressure relief mechanism 14 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism 14, etc.

[0123] For example, the pressure relief mechanism 14 is disposed on the housing 11.

[0124] As an example, the pressure relief mechanism 14 can be integrally formed with the housing 11.

[0125] As an example, the pressure relief mechanism 14 can also be separately configured and connected to the housing 11.

[0126] In some embodiments, when the housing 11 is a non-sealed structure, the pressure relief mechanism 14 can be configured as a through hole for discharging emissions from inside the battery cell 10.

[0127] Optionally, the pressure relief mechanism 14 may be located at the bottom of the battery cell 10 along the first direction X, that is, at the bottom of the battery device 1 as a whole, or the pressure relief mechanism 14 may be located at the top of the battery cell 10 along the first direction X, that is, at the top of the battery device 1 as a whole.

[0128] Optionally, the pressure relief mechanism 14 can be disposed toward the first wall 21 along the first direction X, or it can be disposed away from the first wall 21.

[0129] Please see Figure 3 and Figure 5 In some embodiments, the first direction X is the height direction of the battery cell 10. In the first direction X, the battery cell 10 has a top end 101 and a bottom end 102 disposed opposite to each other. The battery cell 10 includes a pressure relief mechanism 14, which is disposed at the bottom end 102 of the battery cell 10.

[0130] In the first direction X, the height of the top end 101 is higher than the height of the bottom end 102.

[0131] like Figure 3 As shown, the top end 101 of the battery cell 10 can be the end of the end cap 111 facing away from the housing 112 along the first direction X, and correspondingly, the bottom end 102 of the battery cell 10 is the end of the housing 112 facing away from the end cap 111 along the first direction X. Alternatively, the top end 101 of the battery cell 10 can also be the end of the housing 112 facing away from the end cap 111 along the first direction X, and correspondingly, the bottom end 102 of the battery cell 10 is the end of the end cap 111 facing away from the housing 112 along the first direction X.

[0132] By setting it up in the above manner, the pressure relief mechanism 14 is arranged downward in the battery device 1. When the battery cell 10 experiences thermal runaway, its high-temperature and high-pressure gas and emissions can be discharged through the bottom of the battery device 1. When the battery device 1 is applied to electrical equipment such as a vehicle, the high-temperature and high-pressure gas and emissions can be discharged to the outside of the vehicle through the bottom of the vehicle, which can reduce or even avoid the safety risks to the people in the vehicle.

[0133] Please see Figure 5 In some embodiments, along the first direction X, the first wall 21 is closer to the bottom end 102 relative to the top end 101, and in the same projection plane perpendicular to the first direction X, the orthographic projection of the pressure relief mechanism 14 falls into the orthographic projection of the body portion 211.

[0134] By setting the first wall 21 with the first cavity 202 toward the bottom end 102 of the battery cell 10, when a battery cell 10 experiences thermal runaway and releases emissions downwards, the pressure relief mechanism 14 is close to the heat exchange section 212, which can also slow down the spread of thermal runaway to the surrounding area, so as to prevent other battery cells 10 from also experiencing thermal runaway, which helps to reduce the chain reaction caused by the failure of a battery cell 10.

[0135] Furthermore, in the same projection plane perpendicular to the first direction X, the orthographic projection of the pressure relief mechanism 14 falls within the orthographic projection of the main body 211. In other words, in the same projection plane perpendicular to the first direction X, the orthographic projection of the pressure relief mechanism 14 is offset from the orthographic projection of the heat exchange part 212.

[0136] When a battery cell 10 experiences thermal runaway, its pressure relief mechanism 14 is activated to release emissions. By completely separating the pressure relief mechanism 14 from the heat exchange section 212, the emissions released by the pressure relief mechanism 14 will not directly affect the heat exchange section 212, thus preventing damage or even leakage to the heat exchange section 212. This minimizes the impact of thermal runaway on a battery cell 10 and avoids a series of chain problems such as electrical connection issues in the battery cell 10.

[0137] Optionally, in the first direction X, there is a gap between the pressure relief mechanism 14 and the body part 211.

[0138] Please see Figure 5 and Figure 6 In some embodiments, the battery cell 10 further includes an electrode terminal 13, which may be located at the top 101 of the battery cell 10 or at the bottom 102 of the battery cell 10.

[0139] For example, the electrode terminal 13 is located at the bottom end 102 of the battery cell 10, and along the first direction X, the first wall 21 is closer to the bottom end 102 than the top end 101. In the same projection plane perpendicular to the first direction X, the orthographic projection of the electrode terminal 13 is offset from the orthographic projection of the first cavity 202.

[0140] It should be noted that the battery device 1 generates a large amount of heat during charging and discharging, and the area near the electrode terminal 13 in the battery cell 10 has a relatively concentrated heat generation. Therefore, by setting it in the above manner, the electrode terminal 13 can be positioned towards the first wall 21, so that the first cavity 202 for the flow of the first heat exchange medium is positioned closer to the electrode terminal 13. This allows the first heat exchange medium to directly cool the area in the battery cell 10 where the heat generation is concentrated, thereby reducing the temperature near the electrode terminal 13 and preventing the heat from spreading rapidly to the surroundings. This is beneficial for improving the cooling effect on the battery cell 10 and also prevents the local temperature from becoming too high, making the temperature distribution of the battery cell 10 more uniform. This is beneficial for improving the performance of the battery cell 10, and thus for improving the performance of the battery device 1.

[0141] like Figure 5As shown, "in the same projection plane perpendicular to the first direction X, the orthographic projection of the electrode terminal 13 and the orthographic projection of the first cavity 202 are offset" means that in the same projection plane perpendicular to the first direction X, the orthographic projections of the electrode terminal 13 and the first cavity 202 do not overlap, and the electrode terminal 13 and the first cavity 202 are completely offset. In other words, the first cavity 202 can be located on the side of the electrode terminal 13 to exchange heat with the battery cell 10. This arrangement avoids interference between the portion of the heat exchange section 212 with the first cavity 202 and the electrode terminal 13, thereby preventing safety issues such as electrical connection problems and improving the reliability of the battery device 1. Furthermore, this arrangement can reduce the overall size of the battery device 1 along the first direction X, improving the space utilization of the battery device 1, or it can increase the size of the battery cell 10 along the first direction X, thereby increasing the energy density of the battery cell 10.

[0142] Therefore, the battery device 1 provided in some embodiments of this application, by setting the electrode terminal 13 at the end of the battery cell 10 facing the first wall 21, enables the heat exchange section 212 to directly cool the heat in the area near the electrode terminal 13, so as to avoid the heat from spreading to the surroundings. This can better improve the cooling effect and uniformity of the battery cell 10, thereby improving the performance of the battery cell 10 and thus improving the performance of the battery device 1. Furthermore, by staggering the electrode terminal 13 and the first cavity 202, interference between them can be effectively avoided, thus avoiding safety issues such as electrical connection problems and improving the reliability of the battery device 1.

[0143] For example, in the second direction Y, the electrode terminal 13 is spaced apart from the heat exchange section 212, and in the third direction Z, the electrode terminal 13 is spaced apart from the first wall 21.

[0144] In some embodiments, in the second direction Y, the orthographic projection of the electrode terminal 13 overlaps with the orthographic projection of the first cavity 202.

[0145] In the embodiments of this application, "overlap" means that the two overlap at least partially, which can be a partial overlap or a complete overlap.

[0146] By configuring the first cavity 202 closer to the electrode terminal 13, heat exchange with the electrode terminal 13 can be performed more quickly. This helps to avoid heat concentration at the electrode terminal 13 and reduces the rate at which heat diffuses from the electrode terminal 13 to the surrounding area. Furthermore, it allows the battery cell 10 and the first wall 21 to be arranged more compactly, thereby improving the space utilization of the battery device 1.

[0147] Optionally, the battery cell 10 is supported on the first wall 21.

[0148] For example, the battery cell 10 is supported on the heat exchange portion 212 of the first wall 21 by the outer casing 11, so that the first wall 21 can provide support and protection for it, thereby reducing the risk of the outer casing 11 cracking and improving the performance and reliability of the battery device 1.

[0149] Please see Figure 5 In some embodiments, the electrode terminal 13 is spaced apart from the body portion 211 along the first direction X.

[0150] By setting it in this way, interference between the main body 211 and the electrode terminal 13 can be avoided, thus preventing electrical connection problems. Furthermore, the gap between the main body 211 and the battery cell 10 in the first direction X can absorb mechanical impacts from the outside, thereby improving the protection of the battery cell 10 and thus improving the reliability and service life of the battery device 1.

[0151] The main body 211 and the heat exchange section 212 are connected along the second direction Y, wherein the electrode terminal 13 is disposed opposite to the main body 211 along the first direction X. The battery cell 10 is disposed at a distance from the main body 211, and the gap between them can also reserve space for the electrode terminal 13 to avoid electrical connection problems between the electrode terminal 13 and the main body 211, thereby ensuring the reliability of the battery device 1.

[0152] In some embodiments, to avoid electrical connection problems, the electrode terminal 13 is spaced apart from the body portion 211 in the first direction X, and the electrode terminal 13 is spaced apart from the heat exchange portion 212 in the direction perpendicular to the first direction X. That is, the side of the electrode terminal 13 facing away from the battery cell 10 and its periphery are both gapped from the first wall 21 to avoid the electrode terminal 13 from contacting the first wall 21, thereby ensuring the reliability of the battery device 1.

[0153] For example, by Figure 3 and Figure 5 As shown, the electrode terminal 13 and the pressure relief mechanism 14 are both located at the bottom end 102 of the battery cell 10 along the first direction X. Along the second direction Y, the battery cell 10 is provided with the electrode terminal 13, the pressure relief mechanism 14 and the electrode terminal 13 in sequence. Each of the two electrode terminals 13 has a heat exchange part 212 with a first cavity 202 on the side facing away from each other, and each of the two electrode terminals 13 has a body part 211 on the side facing each other.

[0154] like Figure 7 and Figure 8 As shown, in some embodiments, the side surface of the body portion 211 facing the battery cell 10 along the first direction X is located in the same extending plane as the bottom wall 2022 of the first cavity 202.

[0155] In the first direction X, the first cavity 202 has a cavity top wall 2022 and a cavity bottom wall 2021 that are disposed opposite to each other. By aligning the cavity bottom wall 2021 with the side of the main body 211 facing the battery cell 10 in the first direction X, it is convenient to process and manufacture the first wall 21.

[0156] Optionally, the main body 211 is a single-layer solid plate structure.

[0157] Optionally, the heat exchange section 212 is a double-layer hollow plate structure.

[0158] Please see Figures 5 to 7 In some embodiments, in the first direction X, the heat exchange portion 212 protrudes from the side surface of the body portion 211 facing the battery cell 10.

[0159] This arrangement allows the heat exchange section 212 to be closer to the battery cell 10 than the main body 211, which improves the thermal management efficiency of the battery cell 10 and thus enhances the performance of both the battery cell 10 and the battery device 1. Furthermore, the first wall 21 can be configured as a stepped structure, which, while providing thermal management and protection for the battery cell 10, also saves materials and reduces space requirements.

[0160] Please continue reading. Figures 5 to 7 In some embodiments, in the first direction X, the side surface of the heat exchange portion 212 facing away from the battery cell 10 and the side surface of the body portion 211 facing away from the battery cell 10 are located in the same extending plane.

[0161] This can be understood as follows: the surface of the heat exchange section 212 facing away from the battery cell 10 is flush with the surface of the main body 211 facing away from the battery cell 10. This makes the surface of the first wall 21 facing away from the receiving cavity 201 smoother, making the housing 20 more aesthetically pleasing, facilitating assembly, and reducing the risk of the first wall 21 being bumped or knocked by the outside. Furthermore, it facilitates the application of an insulating layer to the surface of the heat exchange section 212 facing away from the battery cell 10 and the surface of the main body 211 facing away from the battery cell 10.

[0162] Please see Figure 8 In some embodiments, the first wall 21 is formed by welding multiple wall units along the second direction Y. Each wall unit has a body portion 211 and a heat exchange portion 212. The body portion 211 and the heat exchange portion 212 in each wall unit are an integral structure.

[0163] By welding multiple wall units along the second direction Y to form the first wall 21, the fabrication of the first wall 21 is facilitated, reducing processing difficulty and improving usability. The number of wall units can be set according to the size of the battery device 1. Furthermore, welding improves the structural strength of the first wall 21, thereby ensuring its thermal management and protection of the battery cell 10, and also improving the lifespan and reliability of the battery device 1. In addition, it also improves the sealing between the multiple wall units, thus ensuring better protection for the battery cell 10.

[0164] Optionally, two adjacent wall units can be welded through their respective body parts 211, which can reduce the impact of welding on the first cavity 202 and ensure the reliability of the first wall 21.

[0165] Optionally, the welding method between two adjacent wall units can be friction stir welding.

[0166] The body part 211 and the heat exchange part 212 in each wall unit can be an integral extruded structural component with a compact layout, which is conducive to improving space utilization and the connection strength between them, thereby improving the structural strength of the first wall 21 and thus improving the reliability of the housing 20 and the battery device 1.

[0167] Please see Figures 5 to 8 In some embodiments, the body portion 211 is provided with a reinforcing structure 2111 on at least one side along the first direction X.

[0168] The reinforcing structure 2111 is used to enhance the structural strength of the main body 211 to compensate for the strength defect caused by its thickness being less than that of the heat exchange part 212, thereby improving the overall structural strength of the first wall 21 and thus improving the reliability of the housing 20 and the battery device 1.

[0169] Optionally, the reinforcing structure 2111 may be disposed on the side of the body portion 211 facing the battery cell 10 along the first direction X, or the reinforcing structure 2111 may also be disposed on the side of the body portion 211 facing away from the battery cell 10 along the first direction X.

[0170] For example, along the first direction X, the main body 211 has a reinforcing structure 2111 protruding on the side facing the battery cell 10, and the reinforcing structure 2111 is spaced apart from the heat exchange part 212.

[0171] By aligning the reinforcing structure 2111 toward the battery cell 10, the surface of the main body 211 facing away from the receiving cavity 201 can be made flatter, which helps to avoid the risk of the reinforcing structure 2111 interfering with external components because it protrudes from the outside of the housing 20.

[0172] Optionally, in the first direction X, there is a gap between the reinforcing structure 2111 and the battery cell 10.

[0173] Optionally, the reinforcing structure 2111 can be integrally formed with the body part 211, which improves processing efficiency and enhances the connection strength between the two, thereby strengthening the structural strength of the body part 211. Alternatively, the reinforcing structure 2111 can be supplied separately from the body part 211 and then assembled, which increases the number of reinforcing structures 2111 used and the flexibility of their layout.

[0174] Optionally, the number of reinforcing structures 2111 can be one, or of course, multiple.

[0175] For example, multiple reinforcing structures 2111 are provided, each reinforcing structure 2111 extends along a third direction Z, and the multiple reinforcing structures 2111 are distributed at intervals along a second direction Y.

[0176] like Figure 8 As shown, in some embodiments, the first wall 21 is formed by connecting multiple wall units along the second direction Y. Each wall unit has a body part 211 and a heat exchange part 212. A reinforcing structure 2111 is provided at the connection between any two adjacent wall units.

[0177] It can be understood that in two adjacent wall units, at least one wall unit has a reinforcing structure 2111 on the side of the body part 211 facing away from the heat exchange part 212 in the second direction Y. When these two adjacent wall units are connected, the connection point has a reinforcing structure 2111.

[0178] By setting it in the above manner, the reinforced structure 2111 can increase the assembly area when two adjacent wall units are connected, which facilitates the connection and assembly of two adjacent wall units and can also improve the connection strength of two adjacent wall units, thereby improving the structural strength of the first wall 21, reducing the assembly difficulty, and thus helping to ensure the reliability of the housing 20 and the battery device 1.

[0179] Please see Figures 5 to 7 In some embodiments, the battery device 1 further includes a heat insulation component 30, which is provided on the side of the body portion 211 facing the receiving cavity 201.

[0180] The insulation component 30 is used to mitigate temperature changes within the receiving cavity 201 to improve cooling or heating effects and to ensure temperature uniformity within the receiving cavity 201.

[0181] Optionally, the insulation component 30 can be made of a material with elastic deformation, such as foam, sponge, rubber, etc., which can not only improve the temperature uniformity, but also eliminate vibration and noise, and absorb the vibration impact brought by the first wall 21, so as to reduce the impact of external vibration or impact on the battery cell 10, which is beneficial to improving the reliability and service life of the battery device 1.

[0182] Optionally, in the first direction X, there is a gap between the thermal insulation component 30 and the battery cell 10.

[0183] Optionally, the heat insulation component 30 is connected to the main body 211 to prevent it from shifting and interfering with the battery cell 10.

[0184] Depend on Figure 5 As shown, in some embodiments, the heat insulation component 30 is disposed between the main body 211, the heat exchange part 212, the reinforcing structure 2111 and the battery cell 10. Before assembly, a clearance space can be reserved on the heat insulation component 30 to avoid the reinforcing structure 2111 from exerting force on the heat insulation component 30, so that the heat insulation component 30 is subjected to the same force to ensure its buffering capacity.

[0185] Please refer to the following: Figures 4 to 7 In some embodiments, the housing 20 further includes a plurality of limiting members 22. Along the first direction X, the plurality of limiting members 22 are all connected to the side of the first wall 21 facing the battery cell 10. The plurality of limiting members 22 are arranged along the second direction Y. The battery cell 10 is disposed between two adjacent limiting members 22 and is fixed by the limiting members 22.

[0186] The limiting member 22 can limit the movement of the battery cell 10 along the second direction Y, which facilitates installation and positioning, and also helps to prevent displacement of the battery cell 10. The limiting member 22 is disposed within the receiving cavity 201.

[0187] The limiting member 22 and the first wall 21 together define the accommodating space of the battery cell 10, which facilitates its installation, positioning and limiting, and can better improve the reliability of the battery device 1.

[0188] Optionally, the limiting member 22 and the first wall 21 can be an integral extrusion molding structure, or the limiting member 22 and the first wall 21 can be provided separately and then assembled.

[0189] In some embodiments, along the first direction X, a plurality of limiting members 22 are connected to the side of the heat exchange section 212 facing the battery cell 10.

[0190] like Figures 5 to 7As shown, in some embodiments, each limiting member 22 includes a first limiting portion 221 and a second limiting portion 222. The battery cell 10 is disposed between two adjacent first limiting portions 221. Along the first direction X, the first limiting portion 221 is connected between the first wall 21 and the second limiting portion 222, and the second limiting portion 222 protrudes from at least one side of the first limiting portion 221 along the second direction Y. In the first direction X, the second limiting portion 222 abuts against the end of the battery cell 10 facing away from the first wall 21.

[0191] By setting it in this way, the second limiting part 222 can cooperate with the first wall 21 to limit the displacement of the battery cell 10 in the first direction X, and the multiple first limiting parts 221 cooperate to limit the displacement of the battery cell 10 in the second direction Y, which helps to ensure the safety of the battery cell 10 and thus improves the reliability of the battery device 1.

[0192] Furthermore, it can further improve the limiting effect of the second limiting part 222 on the battery cell 10, and make the connection between the two more tight and compact, which is conducive to reducing the space occupied and improving the space utilization of the battery device 1.

[0193] For example, along the first direction X, a plurality of first limiting portions 221 are connected to the side of the first wall 21 facing the battery cell 10.

[0194] Please see Figure 4 and Figure 5 In some embodiments, the housing 20 further includes a frame 23, which is connected to the side of the first wall 21 facing the battery cell 10 in the first direction X and surrounds the periphery of the receiving cavity 201 to limit the displacement of the battery cell 10 in the third direction Z.

[0195] In some embodiments, the housing 20 further includes a second wall connected to the side of the frame 23 facing away from the first wall 21 along the first direction X, and the second limiting portion 222 is connected to the second wall.

[0196] Please see Figure 10 In some embodiments, the battery cell 10 has a size of D in the second direction Y, and the second limiting portion 222 covers a portion of the battery cell 10 along the first direction X, having a size of L in the second direction Y, wherein 1 / 100≤D / L≤1 / 5.

[0197] Optionally, each of the second limiting portions 222 may have the same size in the second direction Y, or they may be different.

[0198] For example, the value of D / L can include, but is not limited to, 1 / 100, 2 / 50, 3 / 100, 1 / 10, 3 / 20, 1 / 5, etc.

[0199] If the D / L ratio is set too small, i.e., D / L < 1 / 100, the limiting effect of the second limiting part 222 on the battery cell 10 along the first direction X will be reduced. If the D / L ratio is set too large, i.e., D / L1 > 1 / 5, the material cost of the second limiting part 222 will be increased.

[0200] Therefore, by setting the D / L ratio between 1 / 100 and 1 / 5, including the two endpoint values ​​of 1 / 100 and 1 / 5, it is possible to reduce the cost of the battery device 1 while ensuring that the second limiting part 222 provides a limiting function for the battery cell 10.

[0201] In some embodiments, 3 / 200 ≤ D / L ≤ 3 / 20

[0202] By further setting the D / L ratio between 3 / 200 and 3 / 20, including the two endpoint values ​​of 3 / 200 and 3 / 20, the limiting effect of the second limiting part 222 on the battery cell 10 can be better improved.

[0203] In some embodiments, at least one of the first limiting portion 221 and the second limiting portion 222 has a second cavity configured for the flow of a second heat exchange medium.

[0204] Optionally, the first limiting part 221 may have a second cavity, and two adjacent battery cells 10 may share a first limiting part 221 that can exchange heat. This layout is compact, which helps to simplify the structure and also reduces the impact on the energy density of the battery cell 10.

[0205] Optionally, the battery cell 10 includes a first surface arranged in pairs and facing each other along the second direction Y, a second surface arranged in pairs and facing each other along the first direction X, and a third surface arranged in pairs and facing each other along the third direction Z. The area of ​​the first surface is larger than the area of ​​the second surface and also larger than the area of ​​the third surface. The battery cell 10 contacts the first limiting part 221 through the first surface, which is beneficial to improve the heat exchange efficiency of the battery cell 10, thereby better improving the performance of the battery cell 10 and the battery device 1.

[0206] Optionally, the first cavity 202 and the second cavity can be isolated from each other, that is, the first cavity 202 and the second cavity are independent cavities and there is no communication between them. By setting it in this way, the first heat exchange medium and the second heat exchange medium can be made of different materials, or the first heat exchange medium and the second heat exchange medium can be made to have different temperatures. The specific settings can be set according to the requirements, which is beneficial to improving the flexibility of the battery device 1.

[0207] Optionally, the first cavity 202 and the second cavity can also be interconnected. Accordingly, the first heat exchange medium and the second heat exchange medium can be made of the same material, which helps to simplify the structure and also reduces the number of inlets and outlets for the first heat exchange medium or the second heat exchange medium.

[0208] Optionally, the second limiting part 222 may also have a second cavity for thermal management of the end of the battery cell 10 facing away from the first wall 21 along the first direction X.

[0209] Optionally, both the first limiting part 221 and the second limiting part 222 may be provided with a second cavity, and the second cavities between them may be isolated from each other, or they may be connected to each other.

[0210] Optionally, the second cavity can be configured as a straight structure, or the second cavity can also be configured as a curved structure, wherein the curved structure includes an arc structure and a bent structure.

[0211] The second heat exchange medium can flow in the second cavity to exchange heat with the battery cell 10. The second heat exchange medium can have various forms, such as water, air, phase change material, etc.

[0212] Optionally, the first limiting part 221 and the second limiting part 222 can be an integral extrusion molding structure, or the first limiting part 221 and the second limiting part 222 can be provided separately and then assembled.

[0213] In some embodiments, the first limiting portion 221 and the second limiting portion 222 in each limiting member 22 are integral structures.

[0214] The first limiting part 221 and the second limiting part 222 in each limiting member 22 can be integrally extruded structural parts with a compact layout, which is conducive to improving space utilization and also to improving the connection strength between them, thereby improving the reliability of the battery device 1.

[0215] In some embodiments, the first limiting part 221 and the first wall 21 are an integral structure.

[0216] Specifically, the first limiting part 221, the heat exchange part 212 in each of the first walls 21, and the body part 211 can be an integrally extruded structural component with a compact layout, which is conducive to improving space utilization and also conducive to improving the connection strength between the four components, thereby improving the reliability of the battery device 1.

[0217] In some embodiments, the first limiting part 221, the second limiting part 222, and the first wall 21 are an integral structure.

[0218] For example, the first limiting part 221, the second limiting part 222, the heat exchange part 212 and the body part 211 in each of the first walls 21 can be integrally extruded structural parts with a compact layout, which is conducive to improving space utilization and also conducive to improving the connection strength between the four parts, so as to better fix the battery cell 10, thereby improving the reliability of the battery device 1.

[0219] Furthermore, by using a limiting component, a second limiting part 222, and the heat exchange part 212 and the main body part 211 in each of the first walls 21 to fix the battery cell 10 together, the amount of adhesive applied can be reduced and the limiting effect on the battery cell 10 can be improved.

[0220] Please see Figure 6 and Figure 9 In some embodiments, the limiting member 22 further includes a third limiting part 223, which is connected to one side of the first limiting part 221 along the second direction Y and connected between the first wall 21 and the battery cell 10 along the first direction X. The third limiting part 223, the first limiting part 221 and the first wall 21 enclose to form a third cavity 203, which is configured to allow the flow of a third heat exchange medium.

[0221] By setting it up in the above manner, the thermal management efficiency of the battery cell 10 can be further improved, thereby better improving the performance of the battery cell 10 and the battery device 1.

[0222] Optionally, the third limiting part 223 is connected between the heat exchange part 212 and the battery cell 10 along the first direction X.

[0223] like Figure 9 As shown, optionally, the third limiting part 223 includes a top wall 2231 and a side wall 2232 connected to each other. The top wall 2231 is connected to the first limiting part 221 and is spaced apart from the first wall 21 along the first direction X. The side wall 2232 is connected to the heat exchange part 212 and is spaced apart from the first limiting part 221 along the second direction Y. The top wall 2231, the side wall 2232, the first limiting part 221 and the heat exchange part 212 enclose to form a third cavity 203, and the battery cell 10 is connected to the top wall 2231.

[0224] By setting it in the above manner, the third cavity 203 is formed by the third limiting part 223, the first limiting part 221 and the first wall 21, which helps to reduce material costs and improve space utilization.

[0225] Optionally, the third cavity 203 can be configured as a straight structure, or the third cavity 203 can also be configured as a curved structure, wherein the curved structure includes an arc structure and a bent structure.

[0226] The third heat exchange medium can flow in the third cavity to exchange heat with the battery cell 10. The third heat exchange medium can have various forms, such as water, air, phase change material, etc.

[0227] Optionally, the first cavity 202 and the third cavity can be isolated from each other, or they can be connected.

[0228] In some embodiments, the orthographic projection of the first cavity 202 overlaps with the orthographic projection of the third cavity 203 in the same projection plane perpendicular to the first direction X.

[0229] In the above technical solution, the first heat exchange medium and the third heat exchange medium can also exchange heat, so as to better improve the thermal management efficiency of the battery cell 10.

[0230] In some embodiments, the first limiting portion 221 and the third limiting portion 223 in each limiting member 22 are an integral structure.

[0231] The first limiting part 221 and the third limiting part 223 in each limiting member 22 can be integrally extruded and molded structural parts with a compact layout, which is conducive to improving space utilization and also to improving the connection strength between them, thereby improving the reliability of the battery device 1.

[0232] In some embodiments, the first limiting part 221, the second limiting part 222, and the third limiting part 223 in each limiting member 22 are integral structures.

[0233] The first limiting part 221, the second limiting part 222 and the third limiting part 223 in each limiting member 22 can be an integral extruded molding structure with a compact layout, which is conducive to improving space utilization and also conducive to improving the connection strength between the three, thereby improving the reliability of the battery device 1.

[0234] In some embodiments, the first limiting part 221, the second limiting part 222, the third limiting part 223, and the first wall 21 are an integral structure.

[0235] For example, the first limiting part 221, the second limiting part 222, the third limiting part 223, and the heat exchange part 212 and the body part 211 in each of the first walls 21 can be integrally extruded structural parts with a compact layout, which is conducive to improving space utilization and also conducive to improving the connection strength between the five parts, so as to better fix the battery cell 10, thereby improving the reliability of the battery device 1.

[0236] Furthermore, by using a limiting component, a second limiting part 222, a third limiting part 223, and the heat exchange part 212 and the main body part 211 in each of the first walls 21 to fix the battery cell 10 together, the amount of adhesive applied can be reduced and the limiting effect on the battery cell 10 can be improved.

[0237] Please see Figure 5 and Figure 9 In some embodiments, the battery device 1 further includes a flexible component 40, through which the battery cell 10 is connected to the third limiting portion 223.

[0238] By providing the flexible component 40, the risk of collision between the battery cell 10 and the third limiting part 223 can be reduced, which helps to ensure the safety of the battery cell 10. In addition, during the assembly of the battery cell 10, the flexible component 40 can also provide a buffer force for the battery cell 10, which facilitates the assembly of the battery cell 10.

[0239] Optionally, the flexible component 40 can be made of a material with elastic deformation. For example, the flexible component 40 can be any of foam, sponge, rubber, nylon, etc., which can reduce the friction on the battery cell 10 during assembly, and also help reduce the interference between the battery cell 10 and the third limiting part 223, thereby improving the reliability and service life of the battery device 1.

[0240] Please see Figures 5 to 6 In some embodiments, the housing 20 further includes a frame 23 surrounding the circumference of the receiving cavity 201, and the first wall 21 is welded to the side surface of the frame 23 facing the receiving cavity 201.

[0241] The above-mentioned arrangement facilitates the connection and assembly between the frame 23 and the first wall 21, and also helps to improve the connection strength and sealing after connection, so as to provide better protection for the battery cell 10.

[0242] In some embodiments, the heat exchange section 212 is welded to the frame 23.

[0243] Because the size of the heat exchange part 212 in the first direction X is larger than the size of the body part 211 in the first direction X, the heat exchange part 212 has more assembly area. Therefore, by setting it in the above manner, it is easy to assemble and the heat exchange part 212 can be more firmly connected to the frame 23 to ensure the structural strength of the housing 20.

[0244] Optionally, the welding method between the heat exchange section 212 and the frame 23 can be friction stir welding.

[0245] In some embodiments, in the first direction X, the side surface of the frame 23 facing away from the battery cell 10 and the side surface of the first wall 21 facing away from the battery cell 10 are located in the same extending plane.

[0246] By configuring the enclosure 20 in the above manner, the surface of the enclosure 20 facing away from the receiving cavity 201 along the first direction X is made flatter, making the enclosure 20 more aesthetically pleasing and easier to assemble, while also reducing the risk of the enclosure 20 being bumped or knocked away from the outside. Furthermore, it facilitates the application of an insulating layer to the surface of the frame 23 facing away from the battery cell 10 and the surface of the first wall 21 facing away from the battery cell 10.

[0247] According to some embodiments of this application, this application also provides an electrical device including the battery device 1 provided in any of the above embodiments.

[0248] The battery device 1 is used to store or provide electrical energy.

[0249] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.

[0250] Please refer to the following: Figures 3 to 9 According to some embodiments of this application, this application provides a battery device 1, including a housing 20, a battery cell 10, a thermal insulation component 30, and a flexible component 40, wherein the first direction X is the height direction of the battery cell 10, and the second direction Y intersects with the first direction X.

[0251] The housing 20 has a receiving cavity 201 and includes a first wall 21, a frame 23, and multiple limiting members 22. The first wall 21 surrounds the bottom of the receiving cavity 201 along a first direction X. The first wall 21 is formed by welding multiple wall units along a second direction Y. Each wall unit has a body portion 211 and a heat exchange portion 212 that are interconnected along the second direction Y. The body portion 211 and the heat exchange portion 212 in each wall unit are integral structures. The heat exchange portion 212 has a first cavity 202, which is configured to allow a first heat exchange medium to flow. The frame 23 surrounds the circumference of the receiving cavity 201, and the heat exchange portion 212 is welded to the side surface of the frame 23 facing the receiving cavity 201. In the first direction X, the side surface of the frame 23 facing away from the battery cell 10 and the side surface of the first wall 21 facing away from the battery cell 10 are located in the same extending plane; the bottom wall 2022 of the first cavity 202 and the side surface of the body portion 211 facing the battery cell 10 are located in the same extending plane; the heat exchange portion 212 has a larger size than the body portion 211; the side surface of the heat exchange portion 212 facing the battery cell 10 protrudes from the side surface of the body portion 211 facing the battery cell 10; the side surface of the heat exchange portion 212 facing away from the battery cell 10 and the side surface of the body portion 211 facing away from the battery cell 10 are located in the same extending plane.

[0252] A battery cell 10 is disposed in the receiving cavity 201 and includes a pressure relief mechanism 14. In the first direction X, the battery cell 10 has a top end 101 and a bottom end 102 disposed opposite to each other. The pressure relief mechanism 14 is disposed at the bottom end 102 of the battery cell 10, and in the same projection plane perpendicular to the first direction X, the orthographic projection of the pressure relief mechanism 14 falls within the orthographic projection of the body portion 211. Along the first direction X, a reinforcing structure 2111 and a heat insulation component 30 are protruding from the side of the body portion 211 facing the battery cell 10. The reinforcing structure 2111 is spaced apart from the heat exchange portion 212, and the heat insulation component 30 is disposed between the body portion 211, the battery cell 10, and the reinforcing structure 2111.

[0253] Multiple limiting members 22 are located within the receiving cavity 201. Each limiting member 22 includes a first limiting portion 221, a second limiting portion 222, and a third limiting portion 223. Along the first direction X, the first limiting portion 221 is connected between the first wall 21 and the second limiting portion 222, and the first limiting portion 221 is connected between the heat exchange portion 212 and the second limiting portion 222. The second limiting portion 222 protrudes from the first limiting portion 221 on at least one side along the second direction Y. A battery cell 10 is disposed between two adjacent first limiting portions 221, and the second limiting portion 222 abuts against the top end 101 of the battery cell 10. The battery cell 10 has a dimension D in the second direction Y, and the second limiting portion 222 covers a portion of the battery cell 10 along the first direction X, having a dimension L in the second direction Y, where 3 / 200 ≤ D / L ≤ 3 / 20.

[0254] The third limiting part 223 is connected to the first limiting part 221 on one side along the second direction Y, and is connected between the first wall 21 and the battery cell 10 along the first direction X. The battery cell 10 is connected to the third limiting part 223 through the flexible component 40. The third limiting part 223, the first limiting part 221, and the first wall 21 enclose a third cavity 203, which is configured to allow the flow of a third heat exchange medium. The first limiting part 221, the second limiting part 222, the third limiting part 223, and the heat exchange parts 212 and the main body parts 211 in each of the first walls 21 are an integral structure.

[0255] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0256] 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 they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. However, these 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 device, characterized in that, include: A housing having a receiving cavity, the housing including a first wall surrounding one side of the receiving cavity along a first direction; A single battery cell is disposed in the receiving cavity; The first wall includes a body portion and a heat exchange portion connected to each other along a second direction. The heat exchange portion has a first cavity configured for the flow of a first heat exchange medium. In the first direction, the size of the heat exchange portion is larger than the size of the body portion. The first direction intersects the second direction.

2. The battery device according to claim 1, characterized in that, The first direction is the height direction of the battery cell, and in the first direction, the battery cell has a top end and a bottom end that are disposed opposite to each other; The battery cell includes a pressure relief mechanism located at the bottom end of the battery cell.

3. The battery device according to claim 2, characterized in that, Along the first direction, the first wall is closer to the bottom end relative to the top end, and in the same projection plane perpendicular to the first direction, the orthographic projection of the pressure relief mechanism falls into the orthographic projection of the body portion.

4. The battery device according to any one of claims 1 to 3, characterized in that, The side surface of the main body facing the battery cell along the first direction is located in the same extending plane as the bottom wall of the first cavity.

5. The battery device according to any one of claims 1 to 3, characterized in that, In the first direction, the heat exchange portion protrudes from the side surface of the body portion facing the battery cell.

6. The battery device according to any one of claims 1 to 3, characterized in that, In the first direction, the surface of the heat exchange section facing away from the battery cell and the surface of the body section facing away from the battery cell are located in the same extending plane.

7. The battery device according to any one of claims 1 to 3, characterized in that, The first wall is formed by welding multiple wall units along the second direction. Each wall unit has a body and a heat exchange part, and the body and the heat exchange part of each wall unit are an integral structure.

8. The battery device according to any one of claims 1 to 3, characterized in that, The main body portion has a reinforcing structure protruding from at least one side along the first direction.

9. The battery device according to any one of claims 1 to 3, characterized in that, The battery device also includes a heat insulation component, which is provided on the side of the main body facing the receiving cavity.

10. The battery device according to any one of claims 1 to 3, characterized in that, The housing also includes multiple limiting members. Along the first direction, the multiple limiting members are connected to the side of the first wall facing the battery cell. The multiple limiting members are arranged along the second direction. The battery cell is disposed between two adjacent limiting members and is fixed by the limiting members.

11. The battery device according to claim 10, characterized in that, Each of the aforementioned limiting members includes a first limiting part and a second limiting part. The battery cell is disposed between two adjacent first limiting parts. Along the first direction, the first limiting part is connected between the first wall and the second limiting part, and at least one side of the second limiting part protrudes from the first limiting part along the second direction. In the first direction, the second limiting portion abuts against the end of the battery cell facing away from the first wall.

12. The battery device according to claim 11, characterized in that, The battery cell has a dimension D in the second direction, and the second limiting portion covers a portion of the battery cell along the first direction, which has a dimension L in the second direction, wherein 1 / 100≤D / L≤1 / 5.

13. The battery device according to claim 12, characterized in that, 3 / 200≤D / L≤3 / 20.

14. The battery device according to claim 11, characterized in that, At least one of the first limiting portion and the second limiting portion has a second cavity, which is configured to allow flow of a second heat exchange medium.

15. The battery device according to claim 11, characterized in that, The first limiting part and the second limiting part in each of the limiting members are integral structures, and / or the first limiting part and the first wall are integral structures, and / or the first limiting part, the second limiting part and the first wall are integral structures.

16. The battery device according to claim 11, characterized in that, The limiting member further includes a third limiting part, which is connected to one side of the first limiting part along the second direction and connected between the first wall and the battery cell along the first direction. The third limiting part, the first limiting part, and the first wall enclose a third cavity, which is configured to allow the flow of a third heat exchange medium.

17. The battery device according to claim 16, characterized in that, Within the same projection plane perpendicular to the first direction, the orthographic projection of the first cavity overlaps with the orthographic projection of the third cavity.

18. The battery device according to claim 16, characterized in that, The first limiting part and the third limiting part in each of the limiting members are integral structures, and / or the first limiting part, the second limiting part and the third limiting part in each of the limiting members are integral structures, and / or the first limiting part, the second limiting part, the third limiting part and the first wall are integral structures.

19. The battery device according to claim 16, characterized in that, The battery device further includes a flexible component, through which the battery cell is connected to the third limiting portion.

20. The battery device according to any one of claims 1 to 3, characterized in that, The housing also includes a frame surrounding the circumference of the receiving cavity, and the first wall is welded to the side surface of the frame facing the receiving cavity.

21. The battery device according to claim 20, characterized in that, The heat exchange section is welded to the frame; and / or, in the first direction, the side surface of the frame facing away from the battery cell and the side surface of the first wall facing away from the battery cell are located in the same extending plane.

22. An electrical appliance, characterized in that, The electrical equipment includes a battery device according to any one of claims 1 to 21.

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