Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device, the battery device comprises a first heat management part and a battery cell, and the battery cell comprises a shell and a plurality of electrode terminals. The shell comprises a second wall and two first walls, the two first walls are oppositely arranged in the first direction, the second wall is connected with the two first walls, and the second wall and the first heat management component are oppositely arranged in the second direction and are in heat conduction connection. The size L of the shell in the first direction meets the condition that L is larger than or equal to 300 mm and smaller than or equal to 1600 mm, and the first direction is perpendicular to the second direction. The electrode terminals include positive terminals and negative terminals, and each first wall is provided with at least one positive terminal and at least one negative terminal. The minimum distance between the multiple electrode terminals on the first wall and the first heat management component in the second direction is h1, the size of the shell in the second direction is H, and H / 5 is smaller than or equal to h1. According to the battery device provided by the invention, the risk of electric leakage of the battery monomers caused by lap joint of the cooling liquid and the electrode terminals is reduced, so that the reliability of the battery device is improved.

Description

Technical Field

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

[0002] Battery devices are widely used in electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric planes, electric ships, electric toy cars, electric toy ships, electric toy planes, and power tools, etc.

[0003] In the development of battery device technology, in addition to improving the performance of battery devices, the reliability of battery devices is also an issue that needs to be considered. Therefore, how to improve the reliability of battery devices is an issue that needs to be continuously improved in battery device technology. Utility Model Content

[0004] The present application provides a battery device and an electrical device to improve the reliability of the battery device.

[0005] This application is achieved through the following technical solutions:

[0006] In a first aspect, the present application provides a battery device including a first thermal management component and a battery cell, wherein the battery cell includes a shell and a plurality of electrode terminals. The shell includes a second wall and two first walls, the two first walls are arranged opposite to each other along a first direction, the second wall connects the two first walls, and the second wall is arranged opposite to each other along a second direction and is thermally conductively connected to the first thermal management component. The dimension L of the shell along the first direction satisfies: 300mm≤L≤1600mm, and the first direction and the second direction are perpendicular to each other. The plurality of electrode terminals include a positive terminal and a negative terminal, and each first wall is provided with at least one positive terminal and at least one negative terminal. The minimum spacing between the plurality of electrode terminals on the first wall and the first thermal management component along the second direction is h1, and the dimension of the shell along the second direction is H, H / 5≤h1.

[0007] According to the battery device provided in an embodiment of the present application, by setting the dimension L of the housing along the first direction to satisfy the following conditions: 300mm ≤ L ≤ 1600mm, the housing has a larger dimension along the first direction, which is beneficial for increasing the capacity and energy density of the battery cells. Furthermore, by providing at least one positive terminal and at least one negative terminal on each of the two first walls of the housing that oppose each other along the first direction, the path length of current flowing between the positive and negative terminals is reduced, thereby reducing the impedance of the battery cells and reducing heat generation within the battery cells. Furthermore, a second wall can be provided that is opposite and thermally connected to the first thermal management component along the second direction, and H / 5 ≤ h1 is set. This reduces the risk of coolant leaking from the first thermal management component interfacing with the electrode terminals, causing battery cell leakage, thereby improving the reliability of the battery device.

[0008] According to some embodiments of the present application, h1≤H / 2.

[0009] In the above scheme, the inventors found after systematic analysis and long-term practice that setting H / 5≤h1≤H / 2 is beneficial to reducing the risk of leakage due to overlap between the electrode terminal and the coolant leaked from the first thermal management component, and is also beneficial to increasing the space on the first wall for arranging the electrode terminal, thereby improving the convenience of installing the electrode terminal and the first wall.

[0010] According to some embodiments of the present application, H / 4≤h1≤H / 3.

[0011] In the above scheme, the inventors found after further systematic analysis and practice that setting H / 4≤h1≤H / 3 is further beneficial in reducing the risk of leakage due to overlap between the electrode terminal and the coolant leaked from the first thermal management component, and is further beneficial in increasing the space on the first wall for arranging the electrode terminal, thereby improving the convenience of installing the electrode terminal on the first wall.

[0012] According to some embodiments of the present application, a size of the battery cell along the second direction is greater than a size along the third direction, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0013] In the above solution, if the dimension H of the battery cell along the second direction is larger, the value of h1 can also be larger, which is further beneficial to reduce the risk of battery cell leakage caused by coolant leaking from the first thermal management component overlapping with the electrode terminals on the first wall.

[0014] According to some embodiments of the present application, a dimension d of the housing along the third direction satisfies: 10 mm ≤ d ≤ 30 mm, the first direction, the second direction, and the third direction are perpendicular to each other, and the electrode terminals on the same first wall are staggered along the third direction.

[0015] In the above scheme, the size of the shell along the third direction is smaller, and the space for arranging the electrode terminals along the third direction of the shell is smaller. By arranging the electrode terminals located on the same first wall to be staggered along the third direction, it is beneficial to increase the size of a single electrode terminal along the third direction, and it is also beneficial to increase the electrical gap between the electrode terminals and facilitate the arrangement of the electrode terminals on the first wall.

[0016] According to some embodiments of the present application, different electrode terminals provided on any first wall are spaced apart along the second direction.

[0017] In the above scheme, each electrode terminal has a large distance from the first thermal management component along the second direction, which is beneficial to further reduce the risk of battery cell leakage caused by overlap between the electrode terminals on the first wall and the coolant leaked from the first thermal management component, and is beneficial to the electrical gap between the electrode terminals, reducing the risk of internal short circuit in the battery cell.

[0018] According to some embodiments of the present application, the battery cell further includes an electrode assembly, the electrode assembly including an electrode body and a plurality of tabs, the tabs extending from an end of the electrode body along a first direction, the plurality of tabs including a positive electrode tab and a negative electrode tab, the positive electrode tab being electrically connected to the positive electrode terminal, and the negative electrode tab being electrically connected to the negative electrode terminal. At least one positive electrode tab and at least one negative electrode tab extend from either end of the electrode body along the first direction.

[0019] In the above scheme, by arranging the electrode body to lead out at least one positive electrode tab and at least one negative electrode tab along either end of the first direction, during the cycle operation of the battery cell, the current can choose a closer path to flow to the positive electrode tab or the negative electrode tab at either end of the first direction, which is beneficial to reducing the overcurrent path of the current flowing through the electrode body, and further beneficial to reducing the heat generation rate of the battery cell, thus helping to improve the reliability performance of the battery cell.

[0020] According to some embodiments of the present application, the electrode assembly is in the form of a stack of sheets.

[0021] In the above solution, the electrode assembly is arranged in a stacked shape, which facilitates the processing of the tabs of the electrode assembly and helps reduce the difficulty of the process of preparing the electrode assembly.

[0022] According to some embodiments of the present application, the positive terminal provided on one first wall and the negative terminal provided on another first wall are arranged opposite to each other along the first direction, and the negative terminal provided on one first wall and the positive terminal provided on another first wall are arranged opposite to each other along the first direction.

[0023] In the above solution, it is helpful to reduce the electrical connection path between two adjacent battery cells, thereby helping to simplify the electrical connection structure of the battery cells.

[0024] According to some embodiments of the present application, multiple battery cells are arranged along a third direction, the first direction, the second direction and the third direction are perpendicular to each other, and the positive terminals and negative terminals of the multiple battery cells are alternately arranged along the third direction.

[0025] In the above solution, it is helpful to reduce the electrical connection path between two adjacent battery cells, thereby helping to simplify the electrical connection structure of the battery cells.

[0026] According to some embodiments of the present application, the battery device further includes a bus bar that electrically connects the positive terminal and the negative terminal adjacent to each other along the third direction.

[0027] In the above solution, it is helpful to reduce the connection path of the busbar, thereby simplifying the structure of the busbar and facilitating the electrical connection between the busbar and the electrode terminals, thus helping to further improve the reliability of the battery device.

[0028] According to some embodiments of the present application, the battery device further includes a busbar, which electrically connects two adjacent battery cells, and a thickness e of the busbar satisfies: 1 mm ≤ e ≤ 4 mm.

[0029] In the above scheme, the inventors found after systematic analysis and long-term practice that setting 1mm≤e≤4mm is beneficial to improving the current-carrying capacity of the busbar and reducing the space occupied by the busbar, thereby improving the energy density of the battery device.

[0030] According to some embodiments of the present application, 1.5 mm ≤ e ≤ 3.5 mm.

[0031] In the above solution, setting 1.5 mm ≤ e ≤ 3.5 mm is beneficial to further improve the current carrying capacity of the busbar, further reduce the space occupied by the busbar, and further improve the energy density of the battery device.

[0032] According to some embodiments of the present application, the battery device further includes a busbar that electrically connects two adjacent battery cells. The busbar includes a folded multi-layer busbar layer, wherein the multi-layer busbar layers are stacked in a first direction, and two adjacent layers of the multi-layer busbar layer are interconnected at their ends in a second direction. The multi-layer busbar layer includes a first sublayer and at least one second sublayer, wherein the second sublayer is disposed on a side of the first sublayer facing away from the electrode terminal, and the second sublayer has a through hole disposed opposite the electrode terminal.

[0033] In the above scheme, the busbar includes multiple layers of busbar layers, and a second sublayer is provided with through holes, which are arranged relative to the electrode terminals. This is beneficial for improving the current carrying capacity of the busbar while reducing the process difficulty of welding the busbar to the electrode terminals.

[0034] According to some embodiments of the present application, a dimension L1 of the electrode terminal along the second direction satisfies: 25 mm ≤ L1 ≤ 35 mm.

[0035] In the above scheme, setting 25mm≤L1≤35mm is beneficial to improving the flow capacity of the electrode assembly while reducing the space occupied by the electrode terminals, thereby increasing the energy density of the battery device and facilitating sufficient space on the first wall to set the electrode terminals.

[0036] According to some embodiments of the present application, a dimension L2 of the electrode terminal along the third direction satisfies: 12 mm ≤ L2 ≤ 15 mm, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0037] In the above scheme, setting 12mm≤L2≤15mm is beneficial to improving the current carrying capacity of the electrode assembly while reducing the space occupied by the electrode terminals, thereby increasing the energy density of the battery device and facilitating sufficient space on the first wall to set the electrode terminals.

[0038] According to some embodiments of the present application, the housing has a third wall, which is arranged opposite to the second wall along the second direction, and the minimum distance between the plurality of electrode terminals and the outer surface of the third wall along the second direction is h2, where h2≥3mm.

[0039] In the above solution, setting h2≥3mm facilitates welding of the electrode terminal and the first wall, and facilitates sealing of the connection between the electrode terminal and the first wall, which is beneficial to reducing the process difficulty of the battery cell.

[0040] According to some embodiments of the present application, the housing includes a third wall, which is arranged opposite to the second wall along the second direction. The battery device also includes a second thermal management component, which is arranged opposite to the third wall along the second direction and is thermally conductively connected. The minimum spacing between the multiple electrode terminals on the first wall and the second thermal management component along the second direction is h3, and H / 5≤h3≤H / 2.

[0041] In the above solution, a second thermal management component is provided, and H / 5≤h3≤H / 2 is provided, which is beneficial to improving the heat exchange rate of the battery cell and further reducing the risk of battery cell leakage caused by overlap between the electrode terminal and the coolant.

[0042] According to some embodiments of the present application, the first thermal management component and the second wall are in contact with each other.

[0043] In the above solution, it is beneficial to improve the heat exchange efficiency between the first thermal management component and the battery cell, and further beneficial to improve the reliability performance of the battery cell.

[0044] According to some embodiments of the present application, 90 mm ≤ H ≤ 120 mm.

[0045] In the above solution, setting 90 mm ≤ H ≤ 120 mm is beneficial to improving the energy density of the battery cell while also improving the temperature consistency of the battery cell.

[0046] In a second aspect, the electrical device provided in the embodiments of the present application includes the battery device provided in any of the above embodiments, and the battery device is used to provide electrical energy.

[0047] The electrical device provided in the embodiment of the present application has the same technical effects as the battery device provided in any of the above embodiments, and thus will not be described in detail here.

[0048] The above description is only an overview of the technical solution of this application. In order to more clearly understand the technical means of this application, which can be implemented in accordance with the contents of the description, and to make the above and other purposes, features and advantages of this application more obvious and easy to understand, the following specific embodiments of this application are specifically described. Additional aspects and advantages of this application will be partially given in the following description, and some will become obvious from the following description, or will be learned through practice of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0050] Figure 1 A schematic structural diagram of a vehicle provided in an embodiment of the present application;

[0051] Figure 2 A schematic diagram of the exploded structure of a battery device provided in an embodiment of the present application;

[0052] Figure 3 A schematic diagram of a partial structure of a battery module in a battery device provided in an embodiment of the present application;

[0053] Figure 4 A schematic diagram of the explosion structure of a battery cell in a battery device provided in an embodiment of the present application;

[0054] Figure 5 A schematic structural diagram of a battery device provided in an embodiment of the present application;

[0055] Figure 6 A front view of a battery device provided in an embodiment of the present application;

[0056] Figure 7 for Figure 6 Schematic diagram of the cross-sectional structure along AA;

[0057] Figure 8 This is a front view of the battery device provided in an embodiment of the present application with some structures omitted;

[0058] Figure 9 A schematic diagram of the structure of the battery device provided in an embodiment of the present application with some structures omitted;

[0059] Figure 10 A schematic structural diagram of a busbar in a battery device provided in an embodiment of the present application;

[0060] Figure 11 A schematic structural diagram of another battery device provided in an embodiment of the present application.

[0061] In the drawings, the drawings are not drawn to scale.

[0062] Description of reference numerals:

[0063] 1. Vehicle;

[0064] 10. Battery device; 11. Box; 111. First sub-box; 112. Second sub-box;

[0065] 20. Battery module;

[0066] 30. Battery cell; 31. Housing; 311. Housing; 312. End cap; 313. First wall; 314. Second wall; 315. Third wall; 32. Electrode assembly; 321. Electrode body; 322. Tab; 3221. Positive tab; 3222. Negative tab; 33. Electrode terminal; 331. Positive terminal; 332. Negative terminal;

[0067] 40. A first thermal management component;

[0068] 50, busbar; 51, busbar layer; 511, first sublayer; 512, second sublayer; 512a, through hole

[0069] 60. A second thermal management component;

[0070] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0071] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0072] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0073] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0074] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0075] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces), unless otherwise clearly and specifically defined.

[0076] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0077] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0078] The term "multiple" in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0079] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0080] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. For example, the battery cell assembly may be a battery module, which is a battery module formed by arranging and securing multiple battery cells to form a single module. For example, a battery module may be formed by bundling multiple battery cells using cable ties.

[0081] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case.

[0082] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0083] As an example, the battery cell assembly may also be housed in the box by directly fixing the plurality of battery cells to the box.

[0084] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0085] In some embodiments, the battery device may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0086] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0087] The battery cells may be, but are 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-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, and the like.

[0088] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, located between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0089] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0090] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0091] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0092] In some embodiments, the negative electrode current collector has two opposite surfaces in its thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0093] In some embodiments, the diaphragm is an isolation membrane. The present application has no particular limitation on the type of isolation membrane, and any known isolation membrane with a porous structure having good chemical stability and mechanical stability can be selected.

[0094] As an example, the separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0095] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode, and serves to transport ions and isolate the positive and negative electrodes.

[0096] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0097] In some embodiments, the electrode assembly is a laminate structure.

[0098] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0099] In some embodiments, the housing includes an end cap and a shell. The shell has an opening, and the end cap closes the opening to form a sealed space for accommodating the electrode assembly, electrolyte, and other substances. The shell may have one or more openings. One or more end caps may also be provided.

[0100] In some embodiments, the housing is provided with electrode terminals that are electrically connected to the tabs of the electrode assembly. The electrode terminals may be directly connected to the tabs or indirectly connected to the tabs via current collectors. The electrode terminals may be provided on the end caps or the housing.

[0101] In some embodiments, the housing is provided with an explosion-proof valve for releasing the internal pressure of the battery cell.

[0102] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, and a polygonal battery. The polygonal battery is, for example, a hexagonal battery, etc. There is no special limitation in the embodiments of the present application.

[0103] Battery devices typically require thermal management components to exchange heat with the battery cells. Coolant, such as condensed water, typically flows through the thermal management components. However, as the battery device cycles, the coolant inside the thermal management components presents a significant risk of leakage. The condensed water that leaks out has a high risk of contacting the battery cell terminals and causing electrical leakage, severely impacting the reliability of the battery device.

[0104] In view of this, the battery device provided in the present application includes a first thermal management component and a battery cell, and the battery cell includes a shell and a plurality of electrode terminals. The shell includes a second wall and two first walls, the two first walls are arranged opposite to each other along the first direction, the second wall connects the two first walls, and the second wall is arranged opposite to the first thermal management component along the second direction and is thermally conductively connected. The dimension L of the shell along the first direction satisfies: 300mm≤L≤1600mm, and the first direction and the second direction are perpendicular to each other. The plurality of electrode terminals include positive terminals and negative terminals, and each first wall is provided with at least one positive terminal and at least one negative terminal. The minimum spacing between the plurality of electrode terminals on the first wall and the first thermal management component along the second direction is h1, and the dimension of the shell along the second direction is H, H / 5≤h1.

[0105] In a battery device provided in an embodiment of the present application, the outer shell dimension L along a first direction satisfies the following conditions: 300mm ≤ L ≤ 1600mm. This larger outer shell dimension along the first direction is beneficial for increasing the capacity and energy density of the battery cells. However, the increased length of the battery cells can easily lead to an excessively long current path between the positive and negative terminals, increasing the impedance of the battery cells and leading to increased heat generation. To address this, the present application provides at least one positive terminal and at least one negative terminal on each of two opposing first walls of the outer shell along the first direction. This helps reduce the length of the current path between the positive and negative terminals, thereby reducing the internal resistance of the battery cells and reducing heat generation. After achieving this reduction in heat generation, a second wall is provided, positioned opposite and thermally connected to the first thermal management component along the second direction, with H / 5 ≤ h1. This reduces the risk of coolant leaking from the first thermal management component interfacing with the electrode terminals and causing battery cell leakage, thereby improving the reliability of the battery device.

[0106] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using battery devices.

[0107] The battery device disclosed in the embodiments of the present application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. The battery device disclosed in the present application can be used to form a power supply system for the electrical device.

[0108] The embodiments of the present application provide an electrical device that uses a battery device as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0109] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

[0110] Please refer to Figure 1 , Figure 1Schematic diagram of the structure of the vehicle 1 provided in an embodiment of the present application. The vehicle 1 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, or an extended-range vehicle, etc. A battery device 10 is provided inside the vehicle 1. The battery device 10 can be provided at the bottom, head, or tail of the vehicle 1. The battery device 10 can be used to power the vehicle 1. For example, the battery device 10 can serve as an operating power source for the vehicle 1 and can be used for the circuit system of the vehicle 1, such as for the working power requirements of the vehicle 1 during startup, navigation, and operation.

[0111] The vehicle 1 may further include a controller 1 b and a motor 1 a . The controller 1 b is used to control the battery device 10 to supply power to the motor 1 a , for example, to meet the power requirements of the vehicle 1 during startup, navigation, and driving.

[0112] In some embodiments of the present application, the battery device 10 can serve not only as an operating power source for the vehicle 1 , but also as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0113] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of the battery device 10 provided in an embodiment of the present application. Figure 3 This is a schematic diagram of the structure of the battery module 20 in the battery device 10 provided in an embodiment of the present application. The battery device 10 includes a housing 11 and a battery cell 30, with the battery cell 30 housed within the housing 11. The housing 11 is used to provide a storage space for the battery cell 30, and the housing 11 can adopt a variety of structures. In some embodiments, the housing 11 can include a first sub-housing 111 and a second sub-housing 112, which cover each other and together define a storage space for accommodating the battery cell 30. The second sub-box 112 can be a hollow structure with one end open, and the first sub-box 111 can be a plate-like structure. The first sub-box 111 covers the open side of the second sub-box 112, so that the first sub-box 111 and the second sub-box 112 jointly define a storage space; the first sub-box 111 and the second sub-box 112 can also be hollow structures with one side open, and the open side of the first sub-box 111 covers the open side of the second sub-box 112.

[0114] In the battery device 10, there may be multiple battery cells 30, which may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 30. The multiple battery cells 30 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery module 20 may be housed within the housing 11. Alternatively, the battery device 10 may comprise multiple battery cells 30 connected in series, in parallel, or in a hybrid connection to form a battery module 20, which is then connected in series, in parallel, or in a hybrid connection to form a single unit housed within the housing 11. The battery device 10 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 30.

[0115] The battery cell 30 may be a secondary battery or a primary battery; the battery cell 30 may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.

[0116] Please refer to Figure 4 , Figure 4 Schematic diagram of the explosion structure of the battery cell 30 in the battery device 10 provided in the embodiment of the present application. Figure 4 As shown, the battery cell 30 includes a housing 31, an electrode assembly 32, and electrode terminals 33. The housing 31 includes a shell 311 and an end cap 312. The shell 311 has an opening, and the end cap 312 closes the opening to isolate the internal environment of the battery cell 30 from the external environment.

[0117] The housing 311 is a component used to cooperate with the end cap 312 to form the internal environment of the battery cell 30, wherein the formed internal environment can be used to accommodate the electrode assembly 32, electrolyte, and other components. The housing 311 and the end cap 312 can be independent components. The housing 311 can be of various shapes and sizes. Specifically, the shape of the housing 311 can be determined according to the specific shape and size of the electrode assembly 32. The housing 311 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0118] The end cap 312 refers to a component that covers the opening of the shell 311 to isolate the internal environment of the battery cell 30 from the external environment. Without limitation, the shape of the end cap 312 can be adapted to the shape of the shell 311 to match the shell 311. Optionally, the end cap 312 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 312 is not easily deformed when squeezed or collided, so that the battery cell 30 can have a higher structural strength and the reliability can also be improved. Functional components such as electrode terminals 33 can be provided on the end cap 312. The electrode terminal 33 can be used to electrically connect to the electrode assembly 32 for outputting or inputting electrical energy of the battery cell 30. The material of the end cap 312 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. In some embodiments, an insulating structure may be provided inside the end cap 312 to isolate the electrical connection components in the housing 311 from the end cap 312 to reduce the risk of short circuits. For example, the insulating structure may be made of plastic, rubber, or the like.

[0119] The electrode assembly 32 is the component where the electrochemical reaction occurs in the battery cell 30. One or more electrode assemblies 32 may be contained in the housing 311. The electrode assembly 32 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The separator is used to separate the positive electrode sheet and the negative electrode sheet to prevent internal short circuits between the positive electrode sheet and the negative electrode sheet. The portions of the positive electrode sheet and the negative electrode sheet with active materials constitute the electrode body 321 of the electrode assembly 32, and the portions of the positive electrode sheet and the negative electrode sheet without active materials each constitute the tab 322. The positive electrode tab and the negative electrode tab may be located together at one end of the electrode body 321 or respectively at both ends of the electrode body 321. During the charge and discharge process of the battery cell 30, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 322 connects to the electrode terminal 33 to form a current loop.

[0120] First, as Figure 4 、 Figure 5 、 Figure 6 and Figure 7As shown, the battery device 10 provided herein includes a first thermal management component 40 and a battery cell 30. The battery cell 30 includes a housing 31 and a plurality of electrode terminals 33. The housing 31 includes a second wall 314 and two first walls 313. The two first walls 313 are arranged opposite each other along a first direction X. The second wall 314 connects the two first walls 313 and is arranged opposite each other and thermally connected to the first thermal management component 40 along a second direction Y. The dimension L of the housing 31 along the first direction X satisfies the following conditions: 300 mm ≤ L ≤ 1600 mm. The first direction X and the second direction Y are perpendicular to each other. The plurality of electrode terminals 33 include positive terminals 331 and negative terminals 332. Each first wall 313 is provided with at least one positive terminal 331 and at least one negative terminal 332. The minimum spacing between the plurality of electrode terminals 33 on the first wall 313 and the first thermal management component 40 along the second direction Y is h1. The dimension H of the housing 31 along the second direction Y is H, where H / 5 ≤ h1.

[0121] The dimension L of the shell 31 along the first direction X satisfies: 300mm≤L≤1600mm, then optionally, L can be 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, 600mm, 650mm, 700mm, 750mm, 800mm, 850mm, 900mm, 950mm, 1000mm, 1050mm, 1100mm, 1150mm, 1200mm, 1250mm, 1300mm, 1350mm, 1400mm, 1450mm, 1500mm, 1550mm or 1600mm, etc.

[0122] After systematic analysis and long-term practice, the inventors found that setting 300mm≤L≤1600mm is beneficial to increasing the size of the battery cell 30 and the electrode assembly 32 therein along the first direction X, thereby improving the capacity of the battery cell 30 and improving the energy density of the battery cell 30.

[0123] Because the battery cell 30 has a relatively large dimension L along the first direction X, the battery cell 30 has a relatively high requirement for the current carrying capacity of the electrode terminals 33. Therefore, by providing each first wall 313 with at least one positive electrode terminal 331 and at least one negative electrode terminal 332, the path length of the current flowing between the positive electrode terminal 331 and the negative electrode terminal 332 within the battery cell 30 is reduced, thereby reducing the internal resistance of the battery cell 30 and reducing the heat generated by the battery cell 30.

[0124] Optionally, one positive terminal 331 and one negative terminal 332 may be provided on one first wall 313 , or a plurality of positive terminals 331 and a plurality of negative terminals 332 may be provided on one first wall 313 , which can be selected according to actual needs.

[0125] Optionally, the multiple electrode terminals 33 on the first wall 313 can be arranged along the second direction Y, or the multiple electrode terminals 33 on the first wall 313 can be arranged along a direction intersecting with the second direction Y. For example, the multiple electrode terminals 33 on the first wall 313 can be arranged along a direction perpendicular to the second direction Y.

[0126] The second wall 314 connects the two first walls 313, and the second wall 314 can be perpendicular to the first wall 313. Alternatively, the second wall 314 can be a wall portion with a larger surface area among the multiple wall portions where the housing 31 intersects with the first wall 313, or the second wall 314 can be a wall portion with a smaller surface area among the multiple wall portions where the housing 31 intersects with the first wall 313.

[0127] The second wall 314 is opposite to the first thermal management component 40 along the second direction Y, and the normal direction of the second wall 314 may be the second direction Y. The second wall 314 and the surface of the first thermal management component 40 may be arranged parallel.

[0128] Optionally, the second wall 314 and the first thermal management component 40 can be bonded to each other, or the second wall 314 and the second thermal management component 60 can be thermally connected by thermal conductive glue, etc., so that the battery cell 30 can exchange heat with the first thermal management component 40 through the second wall 314.

[0129] Optionally, the first thermal management component 60 may be a water-cooled plate or the like. The first thermal management component 60 generally has a flow channel inside for cooling liquid such as cooling water to flow through.

[0130] Optionally, the heat exchange between the second wall 314 and the first thermal management component 40 may be that the second wall 314 transfers heat to the first thermal management component 40 to dissipate heat from the battery cell 30. Alternatively, the first thermal management component 40 may transfer heat to the battery cell 30 through the second wall 314 to heat the battery cell 30. For example, when the battery device 10 operates in an extremely cold environment, the battery cell 30 needs to be heated to ensure normal circulation of the battery cell 30.

[0131] Optionally, the battery cells 30 may perform heat exchange only through the second wall 314 , or related thermal management components may be provided on other walls of the housing 31 so that the battery cells 30 may also perform heat exchange through the other walls.

[0132] The plurality of electrode terminals 33 include a positive terminal 331 and a negative terminal 332 , and any electrode terminal 33 can be a positive terminal 331 or a negative terminal 332 . Different battery cells 30 are connected in series or in parallel through the electrode terminals 33 .

[0133] The minimum spacing h1 between the plurality of electrode terminals 33 on the first wall 313 and the first thermal management component 40 along the second direction Y may be the minimum distance between the electrode terminal 33 on the first wall 313 closest to the first thermal management component 40 and the first thermal management component 40 along the second direction Y. Alternatively, the electrode terminal 331 or the negative electrode terminal 332 may have the shortest distance from the first thermal management component 40 along the second direction Y.

[0134] H / 5≤h1, optionally, h can be 0.2H, 0.25H, 0.3H, 0.35H, 0.4H, 0.45H or 0.5H, etc.

[0135] After systematic analysis and long-term practice, the inventors found that setting H / 5≤h1 is beneficial to reducing the risk of leakage of the battery cell 30 caused by overlapping of the electrode terminal 33 and the coolant when the coolant in the first thermal management component 40 leaks, which is beneficial to improving the reliability of the battery device 10.

[0136] The battery device 10 provided in the embodiment of the present application has a larger dimension L of the housing 31 along the first direction X that satisfies the following conditions: 300 mm ≤ L ≤ 1600 mm. This dimension of the housing 31 along the first direction X is larger, which facilitates improving the capacity and energy density of the battery cells 30. Furthermore, the two first walls 313 of the housing 31, each of which is opposed to the other along the first direction X, are each provided with at least one positive terminal 331 and at least one negative terminal 332. This helps reduce the path length of current flowing between the positive terminal 331 and the negative terminal 332, thereby reducing the internal resistance of the battery cells 30 and thus reducing heat generation. Furthermore, the second wall 314 is disposed opposite and thermally connected to the first thermal management component 40 along the second direction Y, with H / 5 ≤ h1. This reduces the risk of coolant leaking from the first thermal management component 40 interfacing with the electrode terminals 33 and causing leakage in the battery cells 30, thereby improving the reliability of the battery device 10.

[0137] In some embodiments, h1 ≤ H / 2.

[0138] Thus, H / 5≤h1≤H / 2, optionally, h1 can be 0.2H, 0.25H, 0.3H, 0.35H, 0.4H, 0.45H or 0.5H, etc.

[0139] It can be understood that, the larger the value of h1 is within a certain range, the more conducive it is to meeting the insulation requirements of the electrode terminal 33 and reducing the risk of leakage due to overlap between the electrode terminal 33 and the coolant. The smaller h1 is within a certain range, the more space there is on the first wall 313 along the second direction Y to arrange the electrode terminal 33, so as to facilitate the arrangement of the electrode terminal 33.

[0140] After systematic analysis and long-term practice, the inventors found that setting H / 5≤h1≤H / 2 is beneficial to reducing the risk of leakage due to overlap between the electrode terminal 33 and the coolant leaked from the first thermal management component 40, and is also beneficial to increasing the space on the first wall 313 for arranging the electrode terminal 33, thereby improving the convenience of installing the electrode terminal 33 and the first wall 313.

[0141] In some embodiments, H / 4≤h1≤H / 3.

[0142] For example, h1 may be 0.25H, 0.3H, or H / 3, etc.

[0143] After further systematic analysis and practice, the inventors found that setting H / 4≤h1≤H / 3 is further beneficial in reducing the risk of leakage due to overlap between the electrode terminal 33 and the coolant leaked from the first thermal management component 40, and is further beneficial in increasing the space on the first wall 313 for arranging the electrode terminal 33, thereby improving the convenience of installing the electrode terminal 33 and the first wall 313.

[0144] In some embodiments, the size of the battery cell 30 along the second direction Y is greater than the size along the third direction Z.

[0145] With this configuration, the dimension H of the battery cell 30 along the second direction Y is larger, and the value of h1 can also be larger, which is further beneficial to reduce the risk of leakage of the battery cell 30 caused by the coolant leaking from the first thermal management component 40 overlapping with the electrode terminal 33 on the first wall 313.

[0146] In some embodiments, as Figure 8 As shown, the dimension d of the housing 31 along the third direction Z satisfies: 10 mm ≤ d ≤ 30 mm, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The electrode terminals 33 on the same first wall 313 are staggered along the third direction Z.

[0147] 10mm≤d≤30mm, optionally, d can be 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm or 30mm, etc.

[0148] If the electrode terminals 33 on the first wall 313 are staggered along the third direction Z, the electrode terminals 33 on the same first wall 313 are not arranged along the third direction Z, and the orthographic projections of the electrode terminals 33 on the first wall 313 along the third direction Z may partially overlap or not overlap at all. In this way, the space occupied by the electrode terminals 33 along the third direction Z can be reduced.

[0149] Therefore, with such a configuration, the size of the outer shell 31 along the third direction Z is smaller, and the space of the outer shell 31 along the third direction Z for arranging the electrode terminals 33 is smaller. By arranging the electrode terminals 33 located on the same first wall 313 to be staggered along the third direction Z, it is beneficial to increase the size of a single electrode terminal 33 along the third direction Z, and it is also beneficial to increase the electrical gap between the electrode terminals 33, and facilitate the arrangement of the electrode terminals 33 on the first wall 313.

[0150] In some embodiments, as Figure 8 As shown, different electrode terminals 33 provided on any first wall 313 are spaced apart along the second direction Y.

[0151] In this way, each electrode terminal 33 has a large distance from the first thermal management component 40 along the second direction Y, which is beneficial to further reduce the risk of leakage of the battery cell 30 caused by overlap between the electrode terminal 33 on the first wall 313 and the coolant leaked from the first thermal management component 40, and is beneficial to the electrical gap between the electrode terminals 33, thereby reducing the risk of internal short circuit in the battery cell 30.

[0152] In some embodiments, as Figure 4 and Figure 8 As shown, the battery cell 30 further includes an electrode assembly 32, which includes an electrode body 321 and multiple tabs 322. The tabs 322 extend from the ends of the electrode body 321 along the first direction X. The multiple tabs 322 include a positive electrode tab 3221 and a negative electrode tab 3222. The positive electrode tab 3221 is electrically connected to the positive electrode terminal 331, and the negative electrode tab 3222 is electrically connected to the negative electrode terminal 332. At least one positive electrode tab 3221 and at least one negative electrode tab 3222 extend from either end of the electrode body 321 along the first direction X.

[0153] At least one positive electrode tab 3221 and at least one negative electrode tab 3222 are led out from either end of the electrode body 321 along the first direction X. Optionally, one positive electrode tab 3221 and one negative electrode tab 3222 can be led out from both ends of an electrode body 321 along the first direction X, respectively. Alternatively, multiple positive electrode tabs 3221 and multiple negative electrode tabs 3222 can be led out from both ends of an electrode body 321 along the first direction X, respectively.

[0154] Since the battery cell 30 has a large size along the first direction X, the electrode body 321 also has a large size along the first direction X. By providing at least one positive electrode tab 3221 and at least one negative electrode tab 3222 extending from either end of the electrode body 321 along the first direction X, during the cycle operation of the battery cell 30, the current can choose a closer path to flow to the positive electrode tab 322 or the negative electrode tab 322 at either end in the first direction X. This helps to reduce the overcurrent path of the current flowing through the electrode body 321, thereby helping to reduce the heat generation of the battery cell 30, thereby helping to improve the reliability of the battery cell 30.

[0155] Alternatively, the electrode assembly 32 may be in a wound shape, or the electrode assembly 32 may be in a laminated shape.

[0156] In some embodiments, the electrode assembly 32 is in the form of a laminate.

[0157] Since both ends of the electrode body 321 along the first direction X are composed of a positive electrode tab 3221 and a negative electrode tab 3222 , the electrode assembly 32 is arranged in a laminated shape, which facilitates the processing of the tabs 322 of the electrode assembly 32 and helps reduce the process difficulty of preparing the electrode assembly 32 .

[0158] In some embodiments, as Figure 7 and Figure 8 As shown, the positive terminal 331 provided on one first wall 313 is opposite to the negative terminal 332 provided on the other first wall 313 along the first direction X, and the negative terminal 332 provided on one first wall 313 is opposite to the positive terminal 331 provided on the other first wall 313 along the first direction X.

[0159] In this manner, the positive electrode terminal 331 and the negative electrode terminal 332 of the two opposing first walls 313 of the same battery cell 30 face each other.

[0160] After the battery cells 30 are arranged in a direction perpendicular to the first direction X and the second direction Y, if one of any two adjacent battery cells 30 is rotated 180° relative to the other about an axis parallel to the second direction Y, the positive terminal 331 and the negative terminal 332 of the two adjacent battery cells 30 at the same end along the first direction X will be adjacent along the second direction Y. This helps reduce the electrical connection path between the two adjacent battery cells 30, thereby simplifying the electrical connection structure of the battery cells 30.

[0161] In some embodiments, as Figure 8 As shown, the plurality of battery cells 30 are arranged along the third direction Z, the first direction X, the second direction Y and the third direction Z are perpendicular to each other, and the positive terminals 331 and the negative terminals 332 of the plurality of battery cells 30 are alternately arranged along the third direction Z.

[0162] Multiple battery cells 30 are arranged along the third direction Z, and since the positive terminal 331 and the negative terminal 332 on the first wall 313 opposite to any battery cell 30 are arranged opposite to each other, one of any two adjacent battery cells 30 along the third direction Z is rotated 180° relative to the other along an axis parallel to the second direction Y, so that the positive terminal 331 and the negative terminal 332 of the multiple battery cells 30 can be alternately arranged along the third direction Z.

[0163] The positive terminals 331 and negative terminals 332 of the plurality of battery cells 30 are alternately arranged along the third direction Z. Thus, along the third direction Z, there is only one negative terminal 332 between any two adjacent positive terminals 331 , and there is only one positive terminal 331 between any two adjacent negative terminals 332 .

[0164] Therefore, such a configuration is beneficial to reducing the electrical connection path between two adjacent battery cells 30 , thereby facilitating the simplification of the electrical connection structure of the battery cells 30 .

[0165] In some embodiments, as Figure 9 and Figure 11 As shown, the battery device 10 further includes a busbar 50 , which electrically connects the positive terminal 331 and the negative terminal 332 adjacent to each other along the third direction Z.

[0166] Since the positive terminals 331 and negative terminals 332 of the battery cells 30 adjacent along the third direction Z are adjacent along the third direction Z, and the spacing between the positive terminals 331 and negative terminals 332 adjacent along the third direction Z is small, the bus 50 connects the adjacent positive terminals 331 and negative terminals 332, which is beneficial to reducing the connection path of the bus 50, and further beneficial to simplifying the structure of the bus 50, and facilitating the electrical connection between the bus 50 and the electrode terminal 33, which is beneficial to further improve the reliability performance of the battery device 10.

[0167] In some embodiments, as Figure 9 and Figure 11 As shown, the battery device 10 further includes a busbar 50 , which electrically connects two adjacent battery cells 30 . The thickness e of the busbar 50 satisfies: 1 mm ≤ e ≤ 4 mm.

[0168] Optionally, e can be 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm or 4mm, etc.

[0169] Since the size L of the battery cell 30 along the first direction X is large, the capacity of the battery cell 30 is large, and the battery cell 30 has a high requirement on the current flow capacity of the busbar 50.

[0170] It can be understood that the larger the value of e is to a certain extent, the more conducive it is to improving the current-carrying capacity of the busbar 50, and the smaller the value of e is to a certain extent, the easier it is to weld the busbar 50 to the electrode terminal 33, and it is conducive to reducing the space occupied by the busbar 50, so as to improve the energy density of the battery device 10.

[0171] After systematic analysis and long-term practice, the inventors found that setting 1mm≤e≤4mm is beneficial to improving the current flow capacity of the busbar 50 and reducing the space occupied by the busbar 50, thereby improving the energy density of the battery device 10.

[0172] In some embodiments, 1.5 mm ≤ e ≤ 3.5 mm.

[0173] Optionally, e can be 1.5mm, 2mm, 2.5mm, 3mm or 3.5mm, etc.

[0174] After further systematic analysis and long-term practice, the inventors found that setting 1.5mm≤e≤3.5mm is beneficial to further improve the current flow capacity of the busbar 50, further reduce the space occupied by the busbar 50, and further improve the energy density of the battery device 10.

[0175] In some embodiments, as Figure 9 and Figure 10 As shown, the battery device 10 further includes a busbar 50, which electrically connects two adjacent battery cells 30. The busbar 50 includes a folded multi-layer busbar layer 51. The multi-layer busbar layers 51 are stacked in a first direction X, and two adjacent layers of the multi-layer busbar layer 51 are connected to each other at their ends in a second direction Y. The multi-layer busbar layer 51 includes a first sublayer 511 and at least one second sublayer 512. The second sublayer 512 is disposed on a side of the first sublayer 511 facing away from the electrode terminal 33. The second sublayer 512 has a through hole 512a, which is disposed opposite the electrode terminal 33.

[0176] The multilayer busbar layer 51 includes a first sublayer 511 and at least one second sublayer 512. Optionally, the multilayer busbar layer 51 may include one first sublayer 511 and one, two, three or more second sublayers 512, which can be specifically configured according to actual needs.

[0177] It is understandable that, to a certain extent, the greater the thickness of the busbar 50, the more conducive it is to improving the current carrying capacity of the busbar 50. On the other hand, the smaller the thickness of the busbar 50, the easier it is to weld the busbar 50 to the electrode terminal 33.

[0178] The busbar 50 is provided to include a plurality of busbar layers 51, and the plurality of busbar layers 51 are stacked along the first direction X, which is beneficial to increasing the thickness of the busbar 50 along the first direction X, so as to improve the current carrying capacity of the busbar 50. By providing the second sub-layer 512 with a through hole 512a, and providing the through hole 512a opposite to the electrode terminal 33, during the welding process of the busbar 50 and the electrode terminal 33, the portion of the first sub-layer 511 opposite to the through hole 512a can be welded to the electrode terminal 33 to facilitate the welding connection between the busbar 50 and the electrode terminal 33.

[0179] Therefore, the busbar 50 includes a multi-layer busbar layer 51, and a second sub-layer 512 is provided with a through hole 512a. The through hole 512a is arranged relative to the electrode terminal 33. This is beneficial to improving the current flow capacity of the busbar 50 while reducing the process difficulty of welding the busbar 50 to the electrode terminal 33.

[0180] In some embodiments, as Figure 8 As shown, the dimension L1 of the electrode terminal 33 along the second direction Y satisfies: 25 mm ≤ L1 ≤ 35 mm.

[0181] Optionally, L1 can be 25mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm or 35mm, etc.

[0182] It can be understood that, to a certain extent, the larger the dimension L1 of the electrode terminal 33 along the second direction Y, the more conducive it is to improving the current carrying capacity of the electrode terminal 33, and the smaller the dimension L1 of the electrode terminal 33 along the second direction Y, the more conducive it is to reducing the volume of the electrode terminal 33, and there can be sufficient space on the first wall 313 to set the electrode terminal 33.

[0183] After systematic analysis and long-term practice, the inventors found that setting 25mm≤L1≤35mm is beneficial to improving the current carrying capacity of the electrode assembly 32 while reducing the space occupied by the electrode terminal 33, thereby increasing the energy density of the battery device 10 and facilitating sufficient space on the first wall 313 to set the electrode terminal 33.

[0184] In some embodiments, as Figure 8 As shown, the dimension L2 of the electrode terminal 33 along the third direction Z satisfies: 12 mm ≤ L2 ≤ 15 mm, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0185] Similarly, the larger the dimension L2 of the electrode terminal 33 along the third direction Z is to a certain extent, the more conducive it is to improving the current carrying capacity of the electrode terminal 33, and the smaller the dimension L2 of the electrode terminal 33 along the third direction Z is to a certain extent, the more conducive it is to reducing the volume of the electrode terminal 33, and there can be enough space on the first wall 313 to set the electrode terminal 33.

[0186] After systematic analysis and long-term practice, the inventors found that setting 12mm≤L2≤15mm is beneficial to improving the current carrying capacity of the electrode assembly 32 while reducing the space occupied by the electrode terminal 33, thereby increasing the energy density of the battery device 10 and facilitating sufficient space on the first wall 313 to set the electrode terminal 33.

[0187] In some embodiments, as Figure 7 As shown, the housing 31 has a third wall 315 , which is arranged opposite to the second wall 314 along the second direction Y. The minimum distance between the plurality of electrode terminals 33 and the outer surface of the third wall 315 along the second direction Y is h2 , and h2 ≥ 3 mm.

[0188] h2≥3mm. Optionally, h2 can be 3mm, 4mm or 5mm, etc.

[0189] Since the third wall 315 is not equipped with any thermal management components, there is no need to insulate the electrode terminal 33 on the first wall 313 near the third wall 315. Therefore, h2 can be smaller than h1. However, considering the manufacturing process of the electrode terminal 33, h2 is relatively large to provide sufficient space for the electrode terminal 33 and facilitate welding and sealing between the electrode terminal 33 and the first wall 313.

[0190] Therefore, after systematic analysis and long-term practice, the inventors found that setting h2≥3mm facilitates welding of the electrode terminal 33 and the first wall 313, and facilitates sealing of the connection between the electrode terminal and the first wall 313, which is beneficial to reducing the process difficulty of the battery cell 30.

[0191] In some embodiments, as Figure 11 As shown, the housing 31 includes a third wall 315, which is arranged opposite to the second wall 314 along the second direction Y. The battery device 10 also includes a second thermal management component 60, which is arranged opposite to the third wall 315 along the second direction Y and is thermally connected. The minimum spacing between the multiple electrode terminals 33 on the first wall 313 and the second thermal management component 60 along the second direction Y is h3, and H / 5≤h3≤H / 2.

[0192] Optionally, h3 can be 0.2H, 0.25H, 0.3H, 0.35H, 0.4H, 0.45H or 0.5H, etc.

[0193] By providing a second thermal management component 60 and providing the second thermal management component 60 and the third wall 315 to be arranged opposite to each other along the second direction Y and thermally connected, heat exchange can be performed on the battery cell 30 through the first thermal management component 40 and the second thermal management component 60 to improve the heat dissipation efficiency of the battery cell 30.

[0194] Setting H / 5≤h3≤H / 2 is beneficial for reducing the risk of leakage of the battery cell 30 caused by the coolant leaking from the second thermal management component 60 overlapping with the electrode terminal 33.

[0195] Therefore, after systematic analysis and long-term practice, the inventors found that setting a second thermal management component 60 and setting H / 5≤h3≤H / 2 is beneficial to improving the heat exchange rate of the battery cell 30 and further reducing the risk of leakage of the battery cell 30 caused by overlapping of the electrode terminal 33 and the coolant.

[0196] In some embodiments, as Figure 7 and Figure 11 As shown, the first thermal management component 40 and the second wall 314 are in contact with each other.

[0197] This is beneficial to improving the heat exchange efficiency between the first thermal management component 40 and the battery cell 30 , and further beneficial to improving the reliability of the battery cell 30 .

[0198] In some embodiments, as Figure 7 As shown, 90mm≤H≤120mm.

[0199] Optionally, H may be 90 mm, 95 mm, 100 mm, 105 mm, 110 mm, 115 mm or 120 mm, etc.

[0200] It can be understood that, to a certain extent, the larger the dimension H of the battery cell 30 along the second direction Y, the more conducive it is to improving the energy density of the battery cell 30, and the smaller the dimension H of the battery cell 30 along the second direction Y, the shorter the distance for heat from various parts of the battery cell 30 to be transferred to the first thermal management component 40 along the second direction Y, which is more conducive to reducing the temperature difference inside the battery cell 30 and providing temperature consistency of the battery cell 30.

[0201] After systematic analysis and long-term practice, the inventors found that setting 90 mm ≤ H ≤ 120 mm is beneficial for improving the energy density of the battery cell 30 while also improving the temperature consistency of the battery cell 30 .

[0202] In a second aspect, the electrical device provided in the embodiments of the present application includes the battery device 10 provided in any of the above embodiments, and the battery device 10 is used to provide electrical energy.

[0203] The embodiment of the present application provides a battery device 10, which has the same technical effects as the power-consuming device provided by any of the above embodiments and will not be described in detail here.

[0204] In some embodiments, as Figures 4 to 11As shown, the battery device 10 provided in an embodiment of the present application includes a first thermal management component 40, a battery cell 30, and a current bus 50. The battery cell 30 includes an electrode assembly 32, a housing 31, and a plurality of electrode terminals 33. The housing 31 includes a third wall 315, a second wall 314, and two first walls 313. The two first walls 313 are arranged opposite each other along a first direction X. The second wall 314 connects the two first walls 313. The second wall 314 is arranged opposite each other and thermally connected to the first thermal management component 40 along a second direction Y. The dimension L of the housing 31 along the first direction X satisfies the following conditions: 300 mm ≤ L ≤ 1600 mm. The dimension d of the housing 31 along the third direction Z satisfies the following conditions: 10 mm ≤ d ≤ 30 mm. The dimension of the battery cell 30 along the second direction Y is greater than the dimension along the third direction Z. The first, second, and third directions Z are perpendicular to each other. The plurality of electrode terminals 33 include positive terminals 331 and negative terminals 332. Each first wall 313 is provided with at least one positive terminal 331 and at least one negative terminal 332. The minimum spacing between the multiple electrode terminals 33 on the first wall 313 and the first thermal management component 40 along the second direction Y is h1. The dimension of the housing 31 along the second direction Y is H, where H / 5 ≤ h1 ≤ H / 2. The different electrode terminals 33 provided on any one of the first walls 313 are spaced apart along the second direction Y. The electrode assembly 32 includes an electrode body 321 and multiple tabs 322. The tabs 322 extend from the ends of the electrode body 321 along the first direction X. The multiple tabs 322 include a positive electrode tab 3221 and a negative electrode tab 3222. The positive electrode tab 3221 is electrically connected to the positive electrode terminal 331, and the negative electrode tab 3222 is electrically connected to the negative electrode terminal 332. At least one positive electrode tab 3221 and at least one negative electrode tab 3222 extend from either end of the electrode body 321 along the first direction X. The positive electrode terminal 331 provided on one first wall 313 and the negative electrode terminal 332 provided on the other first wall 313 are arranged opposite each other along the first direction X. The negative electrode terminal 332 provided on one first wall 313 and the positive electrode terminal 331 provided on the other first wall 313 are arranged opposite each other along the first direction X. Multiple battery cells 30 are arranged along the third direction Z, with the positive electrode terminals 331 and negative electrode terminals 332 of the multiple battery cells 30 arranged alternately along the third direction Z. The current bus 50 electrically connects adjacent positive electrode terminals 331 and negative electrode terminals 332 along the third direction Z. The thickness e of the current bus 50 satisfies the following conditions: 1 mm ≤ e ≤ 4 mm. The dimension L1 of the electrode terminal 33 along the second direction Y satisfies the following conditions: 25 mm ≤ L1 ≤ 35 mm. The dimension L2 of the electrode terminal 33 along the third direction Z satisfies the following conditions: 12 mm ≤ L2 ≤ 15 mm. The third wall 315 and the second wall 314 are disposed opposite each other along the second direction Y. The minimum distance between the electrode terminals 33 and the outer surface of the third wall 315 along the second direction Y is h2, where h2≥3 mm. The first thermal management component 40 and the second wall 314 are bonded to each other.

[0205] The battery device 10 provided in the embodiment of the present application has a larger dimension L of the housing 31 along the first direction X that satisfies the following conditions: 300 mm ≤ L ≤ 1600 mm. This dimension of the housing 31 along the first direction X is larger, which facilitates improving the capacity and energy density of the battery cells 30. Furthermore, the two first walls 313 of the housing 31, each of which is opposed to the other along the first direction X, are each provided with at least one positive terminal 331 and at least one negative terminal 332. This helps reduce the path length of current flowing between the positive terminal 331 and the negative terminal 332, thereby reducing the internal resistance of the battery cells 30 and thus reducing heat generation. Furthermore, the second wall 314 is disposed opposite and thermally connected to the first thermal management component 40 along the second direction Y, with H / 5 ≤ h1. This reduces the risk of coolant leaking from the first thermal management component 40 interfacing with the electrode terminals 33 and causing leakage in the battery cells 30, thereby improving the reliability of the battery device 10.

[0206] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A battery device, characterized in that: include: a first thermal management component; A battery cell comprising a housing and a plurality of electrode terminals, wherein the housing comprises a second wall and two first walls, the two first walls being arranged opposite each other along a first direction, the second wall connecting the two first walls, and the second wall being arranged opposite each other along a second direction and being thermally connected to the first thermal management component; A dimension L of the housing along the first direction satisfies: 300 mm ≤ L ≤ 1600 mm, and the first direction and the second direction are perpendicular to each other; The plurality of electrode terminals include positive terminals and negative terminals, and each of the first walls is provided with at least one positive terminal and at least one negative terminal; The minimum distance between the plurality of electrode terminals on the first wall and the first heat management component along the second direction is h1, and the size of the housing along the second direction is H, where H / 5≤h1.

2. The battery device according to claim 1, wherein: h1≤H / 2.

3. The battery device according to claim 2, characterized in that H / 4≤h1≤H / 3.

4. The battery device according to claim 1, wherein: The size of the battery cell along the second direction is greater than that along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

5. The battery device according to claim 1, wherein: The dimension d of the housing along the third direction satisfies: 10 mm ≤ d ≤ 30 mm, and the first direction, the second direction, and the third direction are perpendicular to each other; The electrode terminals located on the same first wall are staggered along the third direction.

6. The battery device according to claim 1, wherein: The different electrode terminals provided on any one of the first walls are spaced apart along the second direction.

7. The battery device according to claim 1, wherein: The battery cell further includes an electrode assembly, the electrode assembly including an electrode body and a plurality of tabs, the tabs extending from an end of the electrode body along the first direction, the plurality of tabs including a positive tab and a negative tab, the positive tab being electrically connected to the positive terminal, and the negative tab being electrically connected to the negative terminal; At least one positive electrode tab and at least one negative electrode tab are led out from either end of the electrode body along the first direction.

8. The battery device according to claim 7, characterized in that The electrode assembly is in a laminated shape.

9. The battery device according to claim 1, wherein: The positive terminal provided on one first wall and the negative terminal provided on the other first wall are arranged opposite to each other along the first direction, and the negative terminal provided on one first wall and the positive terminal provided on the other first wall are arranged opposite to each other along the first direction.

10. The battery device according to claim 9, characterized in that The plurality of battery cells are arranged along a third direction, the first direction, the second direction and the third direction are perpendicular to each other, and the positive terminals and the negative terminals of the plurality of battery cells are alternately arranged along the third direction.

11. The battery device according to claim 10, characterized in that The battery device further includes a bus bar that electrically connects the positive electrode terminal and the negative electrode terminal adjacent to each other in the third direction.

12. The battery device according to claim 1, wherein: The battery device further includes a busbar, which electrically connects two adjacent battery cells. A thickness e of the busbar satisfies the following: 1 mm ≤ e ≤ 4 mm.

13. The battery device according to claim 12, characterized in that 1.5mm≤e≤3.5mm.

14. The battery device according to claim 1, wherein: The battery device further includes a busbar, the busbar electrically connecting two adjacent battery cells, the busbar comprising a folded multi-layer busbar layer, the multi-layer busbar layer being stacked in the first direction, and two adjacent layers of the multi-layer busbar layer being connected to each other at ends in the second direction; The multi-layer busbar layer includes a first sublayer and at least one second sublayer, the second sublayer is arranged on the side of the first sublayer facing away from the electrode terminal, and the second sublayer has a through hole, which is arranged opposite to the electrode terminal.

15. The battery device according to any one of claims 1 to 14, characterized in that A dimension L1 of the electrode terminal along the second direction satisfies: 25 mm ≤ L1 ≤ 35 mm; and / or a dimension L2 of the electrode terminal along the third direction satisfies: 12 mm ≤ L2 ≤ 15 mm, and the first direction, the second direction and the third direction are perpendicular to each other.

16. The battery device according to any one of claims 1 to 14, characterized in that The housing has a third wall, which is arranged opposite to the second wall along the second direction. The minimum distance between the plurality of electrode terminals and the outer surface of the third wall along the second direction is h2, and h2 ≥ 3 mm.

17. The battery device according to any one of claims 1 to 14, characterized in that The housing includes a third wall, which is arranged opposite to the second wall along the second direction. The battery device also includes a second thermal management component, which is arranged opposite to the third wall along the second direction and is thermally conductively connected. The minimum spacing between the multiple electrode terminals on the first wall and the second thermal management component along the second direction is h3, and H / 5≤h3≤H / 2.

18. The battery device according to any one of claims 1 to 14, characterized in that The first heat management component and the second wall are in contact with each other.

19. The battery device according to any one of claims 1 to 14, characterized in that 90mm≤H≤120mm.

20. An electrical device, characterized in that: The battery device comprises the battery device according to any one of claims 1 to 19, wherein the battery device is used to provide electrical energy.

Images