Battery device and electrical device

Abstract

Provided in the present application are a battery device and an electrical device. The battery device comprises a first thermal management component and battery cells. Each battery cell comprises a housing and a plurality of electrode terminals; the housing comprises a second wall and two first walls, the two first walls being arranged opposite to each other in a first direction, the second wall connecting the two first walls, and the second wall and the first thermal management component being arranged opposite to each other in a second direction and being in a thermally-conductive connection; the dimension L of the housing in the first direction satisfies: 300 mm≤L≤1600 mm, and the first direction and the second direction are perpendicular to each other; the electrode terminals comprise positive terminals and negative terminals, each first wall being provided with at least one positive terminal and at least one negative terminal; the minimum distance in the second direction between the plurality of electrode terminals on each first wall and the first thermal management component is h1, and the dimension of the housing in the second direction is H, H / 5≤h1. The battery device provided in the present application can help to reduce the risk of electric leakage of the battery cells caused by contact between a coolant and the electrode terminals, such that the reliability of the battery device is improved.

Description

Battery device and electric device TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, and particularly relates to a battery device and an electric device. BACKGROUND

[0002] The battery device is widely used in electronic equipment, such as mobile phone, notebook computer, electric vehicle, electric automobile, electric airplane, electric ship, electric toy automobile, electric toy ship, electric toy airplane and electric tool.

[0003] In the development of the battery device technology, in addition to improving the use performance of the battery device, the reliability of the battery device is also a problem to be considered. Therefore, how to improve the reliability of the battery device is a continuous improvement problem in the battery device technology.

[0004] SUMMARY

[0005] The present application provides a battery device and an electric device to improve the reliability of the battery device.

[0006] The present application is realized by the following technical scheme:

[0007] In a first aspect, the present application provides a battery device including a first thermal management component and a battery monomer. The battery monomer includes a shell and a plurality of electrode terminals. The shell includes a second wall and two first walls. The two first walls are oppositely arranged along a first direction, and the second wall connects the two first walls. The second wall is oppositely arranged with the first thermal management component along a second direction and is in thermal connection. The size L of the shell along the first direction satisfies 300mm≤L≤1600mm, and the first direction is perpendicular to the second direction. The plurality of electrode terminals includes a positive electrode terminal and a negative electrode terminal. Each first wall is provided with at least one positive electrode terminal and at least one negative electrode terminal. The minimum distance between the plurality of electrode terminals on the first wall and the first thermal management component along the second direction is h1, the size of the shell along the second direction is H, and H / 5≤h1.

[0008] According to the battery device provided in the embodiments of the present application, by setting the size L of the shell along the first direction to satisfy 300mm≤L≤1600mm, the size of the shell along the first direction is large, which is beneficial to improve the capacity and energy density of the battery monomer. Further, by setting at least one positive electrode terminal and at least one negative electrode terminal on each of the two first walls opposite along the first direction of the shell, the path length of the current flowing between the positive electrode terminal and the negative electrode terminal is reduced, thereby reducing the impedance of the battery monomer to reduce the heat generation of the battery monomer. On this basis, the second wall and the first heat management component can be arranged opposite along the second direction and in thermal connection, and H / 5≤h1 is set, which is beneficial to reduce the risk of the battery monomer short-circuiting caused by the overlapping of the leaked cooling liquid of the first heat management component and the electrode terminal, and further beneficial to improve the reliability of the battery device.

[0009] According to some embodiments of the present application, h1≤H / 2.

[0010] In the above scheme, the inventors have found through systematic analysis and long-term practice that setting H / 5≤h1≤H / 2 is beneficial to reduce the risk of the electrode terminal short-circuiting caused by the overlapping of the leaked cooling liquid of the first heat management component and the electrode terminal, and further beneficial to increase the space on the first wall for arranging the electrode terminal, thereby further beneficial to improve the convenience of mounting the electrode terminal on the first wall.

[0011] According to some embodiments of the present application, H / 4≤h1≤H / 3.

[0012] In the above scheme, the inventors have found through further systematic analysis and practice that setting H / 4≤h1≤H / 3 is further beneficial to reduce the risk of the electrode terminal short-circuiting caused by the overlapping of the leaked cooling liquid of the first heat management component and the electrode terminal, and further beneficial to increase the space on the first wall for arranging the electrode terminal, thereby further beneficial to improve the convenience of mounting the electrode terminal on the first wall.

[0013] According to some embodiments of the present application, the size of the battery monomer along the second direction is greater than the size along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0014] In the above scheme, the size H of the battery monomer along the second direction is large, and the value of h1 can also be large, which is further beneficial to reduce the risk of the battery monomer short-circuiting caused by the overlapping of the leaked cooling liquid of the first heat management component and the electrode terminal on the first wall.

[0015] According to some embodiments of the present application, the size d of the shell along the third direction satisfies 10mm≤d≤30mm, 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.

[0016] In the above scheme, the shell has a small size along the third direction, and thus the space for arranging the electrode terminals along the third direction is small. By arranging the electrode terminals on the same first wall to be staggered along the third direction, the size of a single electrode terminal along the third direction is increased, the electrical gap between the electrode terminals is increased, and the arrangement of the electrode terminals on the first wall is facilitated.

[0017] According to some embodiments of the present application, the different electrode terminals arranged on any first wall are arranged to be spaced apart along the second direction.

[0018] In the above scheme, each electrode terminal has a large distance from the first thermal management component along the second direction, which further reduces the risk of the electrode terminals on the first wall being in contact with the leaked cooling liquid of the first thermal management component and causing the battery cell to leak electricity, and which further reduces the risk of internal short circuit of the battery cell.

[0019] 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 being led out from an end of the electrode body along the first direction, the plurality of tabs including positive tabs and negative tabs, the positive tabs being electrically connected to the positive terminals, and the negative tabs being electrically connected to the negative terminals. At least one positive tab and at least one negative tab are led out from any end of the electrode body along the first direction.

[0020] In the above scheme, by arranging at least one positive tab and at least one negative tab to be led out from any end of the electrode body along the first direction, during the cyclic operation of the battery cell, the current can flow to the positive tab or the negative tab at any end of the electrode body along the first direction through a shorter path, which reduces the overcurrent path of the current flowing through the electrode body, and thus reduces the heat generation rate of the battery cell, and thus improves the reliability of the battery cell.

[0021] According to some embodiments of the present application, the electrode assembly has a laminated shape.

[0022] In the above scheme, by arranging the electrode assembly to have a laminated shape, the tabs of the electrode assembly are facilitated to be processed, and the process difficulty of the preparation of the electrode assembly is reduced.

[0023] According to some embodiments of the present application, the positive terminals arranged on one first wall are arranged opposite to the negative terminals arranged on another first wall along the first direction, and the negative terminals arranged on one first wall are arranged opposite to the positive terminals arranged on another first wall along the first direction.

[0024] In the above scheme, the electrical connection path of two adjacent battery cells is reduced, and thus the electrical connection structure of the battery cell is simplified.

[0025] According to some embodiments of the present application, 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 electrode terminals and the negative electrode terminals of the plurality of battery cells are alternately arranged along the third direction.

[0026] In the above scheme, it is beneficial to reduce the electrical connection path of the two adjacent battery cells, thereby simplifying the electrical connection structure of the battery cell.

[0027] According to some embodiments of the present application, the battery device further comprises a busbar, the busbar electrically connects the positive electrode terminal and the negative electrode terminal adjacent in the third direction.

[0028] In the above scheme, it is beneficial 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 terminal, so as to further improve the reliability of the battery device.

[0029] According to some embodiments of the present application, the battery device further comprises a busbar, the busbar electrically connects the two adjacent battery cells, and the thickness e of the busbar satisfies: 1mm≤e≤4mm.

[0030] In the above scheme, the inventors have found through systematic analysis and long-term practice that setting 1mm≤e≤4mm is beneficial to improve the current-carrying capacity of the busbar and reduce the space occupied by the busbar, thereby improving the energy density of the battery device.

[0031] According to some embodiments of the present application, 1.5mm≤e≤3.5mm.

[0032] In the above scheme, setting 1.5mm≤e≤3.5mm is beneficial to further improve the current-carrying capacity of the busbar and further reduce the space occupied by the busbar, thereby further improving the energy density of the battery device.

[0033] According to some embodiments of the present application, the battery device further comprises a busbar, the busbar electrically connects the two adjacent battery cells, and the busbar comprises a plurality of folded busbar layers, the stacking direction of the plurality of busbar layers is the first direction, and the end portions of the two adjacent busbar layers in the second direction are connected to each other. The plurality of busbar layers comprises a first sub-layer and at least one second sub-layer, the second sub-layer is arranged on the side of the first sub-layer away from the electrode terminal, the second sub-layer has a through hole, and the through hole is arranged opposite to the electrode terminal.

[0034] In the above scheme, the busbar comprises a plurality of busbar layers, and the second sub-layer has a through hole arranged opposite to the electrode terminal, which is beneficial to improve the current-carrying capacity of the busbar and reduce the process difficulty of the welding connection between the busbar and the electrode terminal.

[0035] According to some embodiments of the present application, the size L1 of the electrode terminal along the second direction satisfies: 25mm≤L1≤35mm.

[0036] In the above scheme, 25mm≤L1≤35mm is set, which is conducive to improving the overcurrent capacity of the electrode assembly while reducing the space occupied by the electrode terminal, improving the energy density of the battery device, and facilitating the electrode terminal to have sufficient space in the first wall.

[0037] According to some embodiments of the present application, the size L2 of the electrode terminal along the third direction satisfies: 12mm≤L2≤15mm, and the first direction, the second direction and the third direction are perpendicular to each other.

[0038] In the above scheme, 12mm≤L2≤15mm is set, which is conducive to improving the overcurrent capacity of the electrode assembly while reducing the space occupied by the electrode terminal, improving the energy density of the battery device, and facilitating the electrode terminal to have sufficient space in the first wall.

[0039] According to some embodiments of the present application, the shell has a third wall, the third wall is oppositely arranged with 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, h2≥3mm.

[0040] In the above scheme, h2≥3mm is set, which is conducive to the welding of the electrode terminal and the first wall, and facilitates the sealing of the connection between the electrode terminal and the first wall, which is conducive to reducing the process difficulty of the battery monomer.

[0041] According to some embodiments of the present application, the shell includes a third wall, the third wall is oppositely arranged with the second wall along the second direction, and the battery device further includes a second heat management component, the second heat management component is oppositely arranged with the third wall along the second direction and is in thermal connection, and the minimum distance between the plurality of electrode terminals on the first wall and the second heat management component along the second direction is h3, H / 5≤h3≤H / 2.

[0042] In the above scheme, the second heat management component is set, and H / 5≤h3≤H / 2 is set, which is conducive to improving the heat exchange rate of the battery monomer, and further reducing the risk of battery monomer leakage caused by the overlap of the electrode terminal and the cooling liquid.

[0043] According to some embodiments of the present application, the first heat management component and the second wall are mutually attached.

[0044] In the above scheme, it is conducive to improving the heat exchange efficiency of the first heat management component and the battery monomer, and further conducive to improving the reliability of the battery monomer.

[0045] According to some embodiments of the present application, 90mm≤H≤120mm.

[0046] In the above scheme, 90mm≤H≤120mm is set, which is beneficial to improve the energy density of the battery monomer and the temperature consistency of the battery monomer.

[0047] In a second aspect, the power consuming device provided by the embodiments of the present application comprises the battery device provided by any of the above embodiments, and the battery device is used to provide electric energy.

[0048] The power consuming device provided by the embodiments of the present application has the same technical effects as the battery device provided by any of the above embodiments, and thus will not be described here.

[0049] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following will describe the specific embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0050] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the drawings.

[0051] Fig. 1 is a structural schematic diagram of a vehicle provided by the embodiments of the present application;

[0052] Fig. 2 is an exploded structural schematic diagram of a battery device provided by the embodiments of the present application;

[0053] Fig. 3 is a partial structural schematic diagram of a battery module in the battery device provided by the embodiments of the present application;

[0054] Fig. 4 is an exploded structural schematic diagram of a battery monomer in the battery device provided by the embodiments of the present application;

[0055] Fig. 5 is a structural schematic diagram of a battery device provided by the embodiments of the present application;

[0056] Fig. 6 is a front view of a battery device provided by the embodiments of the present application;

[0057] Fig. 7 is a sectional structural schematic diagram of Fig. 6 along A-A;

[0058] Fig. 8 is a front view of a battery device provided by the embodiments of the present application after omitting part of the structure;

[0059] Fig. 9 is a structural schematic diagram of a battery device provided by the embodiments of the present application after omitting part of the structure;

[0060] FIG. 10 is a structural schematic diagram of a busbar in a battery device according to an embodiment of the present application;

[0061] FIG. 11 is a structural schematic diagram of another battery device according to an embodiment of the present application.

[0062] In the drawings, the drawings are not drawn according to the actual proportions.

[0063] Legend: 1, vehicle; 10, battery device; 11, box; 111, first sub-box; 112, second sub-box; 20, battery module; 30, battery cell; 31, outer shell; 311, shell; 312, end cover; 313, first wall; 314, second wall; 315, third wall; 32, electrode assembly; 321, electrode body; 322, tab; 3221, positive electrode tab; 3222, negative electrode tab; 33, electrode terminal; 331, positive electrode terminal; 332, negative electrode terminal; 40, first thermal management component; 50, busbar; 51, busbar layer; 511, first sub-layer; 512, second sub-layer; 512a, through hole; 60, second thermal management component; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0064] The embodiments of the present application will be further described below in conjunction with the drawings and examples. The detailed description and drawings of the following examples are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, i.e., the present application is not limited to the described examples.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application; the use herein of terms such as “comprise” and “have” and any variations thereof are intended to cover the presence of stated features, integers, steps, or components but not to preclude the presence or addition of one or more other features, integers, steps, components, or groups thereof.

[0066] In the description of the embodiments of the present application, the technical terms “first”, “second”, and the like 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.

[0067] Reference herein to “an embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0068] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces), unless otherwise explicitly specified and limited.

[0069] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0070] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing", and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0071] "Multiple" appearing in the present application refers to two or more (including two), and similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0072] The battery apparatus mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, parallel, or mixed connection through a busbar component.

[0073] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0074] In some embodiments, the battery device can be a battery pack, which includes a case and one or more battery cell assemblies housed in the case.

[0075] As an example, the battery cell assembly can be a battery module, which can be housed in the case by fixing the battery module in the case.

[0076] As an example, the battery cell assembly can also be housed in the case by fixing a plurality of battery cells directly in the case.

[0077] In some embodiments, the case can be part of a chassis structure of a vehicle. For example, part of the case can be at least part of a floor of the vehicle, or part of the case can be at least part of a cross beam and a longitudinal beam of the vehicle.

[0078] In some embodiments, the battery device can be an energy storage device. The energy storage device can include an energy storage container, an energy storage cabinet, etc.

[0079] In embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0080] The battery cell can be, but is not limited to, a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc.

[0081] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During charging and discharging of the battery cell, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, and can prevent the positive electrode and the negative electrode from short-circuiting, while allowing the active ions to pass through.

[0082] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0083] As an example, the positive electrode current collector has two opposite surfaces in the thickness direction thereof, and the positive electrode active material is disposed on either one or both of the two opposite surfaces of the positive electrode current collector.

[0084] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0085] In some embodiments, the negative electrode current collector has two opposite surfaces in the thickness direction thereof, and the negative electrode active material is disposed on either one or both of the two opposite surfaces of the negative electrode current collector.

[0086] In some embodiments, the separator is a separator film. The type of the separator film is not particularly limited in the present application, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0087] As an example, the separator film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separator film is a multi-layer composite film, the materials of the layers can be the same or different, and are not particularly limited. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes.

[0088] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, and functions to transport ions and separate the positive and negative electrodes.

[0089] In some embodiments, the electrode assembly is a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound into a jelly-roll structure.

[0090] In some embodiments, the electrode assembly is a stack structure.

[0091] In some embodiments, the battery cell can include a housing. The housing is used to package components such as the electrode assembly and the electrolyte. The housing can be a steel case, an aluminum case, a plastic case (such as polypropylene), a composite metal case (such as a copper-aluminum composite case), or an aluminum-plastic film, etc.

[0092] In some embodiments, the housing includes an end cap and a case, the case is provided with an opening, and the end cap closes the opening to form a sealed space for accommodating the electrode assembly and the electrolyte, etc. The case can be provided with one or more openings. The end cap can also be provided with one or more openings.

[0093] In some embodiments, the housing is provided with an electrode terminal, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab, or can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the case.

[0094] In some embodiments, the housing is provided with an explosion-proof valve. The explosion-proof valve is used to release the internal pressure of the battery cell.

[0095] 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, and the prismatic battery cell includes a square battery cell, a blade-shaped battery cell, a multi-prismatic battery cell, such as a hexagonal battery cell, etc. The embodiments of the present application are not particularly limited.

[0096] In a battery device, it is usually required to arrange a heat management component in heat exchange with a battery monomer, and a cooling liquid such as condensed water needs to flow through the heat management component. With the increase of the cycle times of the battery device, the cooling liquid in the heat management component has a high risk of leakage, and the leaked condensed water has a high risk of being in contact with the electrode terminals of the battery monomer to cause the battery monomer to leak electricity. Therefore, the reliability of the battery device is seriously affected.

[0097] Therefore, the battery device provided in the application comprises a first heat management component and a battery monomer. The battery monomer 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 along a first direction. The second wall is connected to the two first walls. The second wall is oppositely arranged with the first heat management component along a second direction and is in heat conduction connection. The size L of the shell along the first direction satisfies 300mm≤L≤1600mm. The first direction is perpendicular to the second direction. The plurality of electrode terminals comprises positive electrode terminals and negative electrode terminals. Each first wall is provided with at least one positive electrode terminal and at least one negative electrode 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. The size of the shell along the second direction is H, and H / 5≤h1.

[0098] The battery device provided in the application embodiment has the advantages that the size L of the shell along the first direction satisfies 300mm≤L≤1600mm, so that the size of the shell along the first direction is large, which is beneficial to improve the capacity and energy density of the battery monomer. However, the length of the battery monomer is increased, which easily leads to the fact that the flow path of the current between the positive electrode terminals and the negative electrode terminals is too long, so that the impedance of the battery monomer is increased, and the heat generation of the battery monomer is increased. Therefore, the application is provided with at least one positive electrode terminal and at least one negative electrode terminal on each of the two first walls of the shell along the first direction, which is beneficial to reduce the path length of the current flowing between the positive electrode terminals and the negative electrode terminals, so as to reduce the internal resistance of the battery monomer and reduce the heat generation of the battery monomer. After the heat generation of the battery monomer is reduced through the above arrangement, the second wall is oppositely arranged with the first heat management component along the second direction and is in heat conduction connection, and H / 5≤h1 is arranged, which is beneficial to reduce the risk that the leaked cooling liquid in the first heat management component is in contact with the electrode terminals to cause the battery monomer to leak electricity, and is further beneficial to improve the reliability of the battery device.

[0099] The technical solutions described in the application embodiments are suitable for battery devices and electric devices using the battery devices.

[0100] The battery device disclosed in the application embodiments can be used in, but is not limited to, electric devices such as vehicles, ships or aircraft. The power supply system of the electric device can be composed of the battery device disclosed in the application.

[0101] The embodiments of the present application provide a power consumption device using a battery device as a power supply. The power consumption device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric vehicle, a ship, a spacecraft, and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, and the like. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

[0102] The following embodiments are described by taking a power consumption device as a vehicle in an embodiment of the present application as an example for convenience of description.

[0103] Referring to FIG. 1, FIG. 1 is a structural schematic diagram of a vehicle 1 provided by an embodiment of the present application. The vehicle 1 can be a fuel automobile, a gas automobile, or a new energy automobile. The new energy automobile can be a pure electric vehicle, a hybrid electric vehicle, or a range extended vehicle. The vehicle 1 is internally provided with a battery device 10. The battery device 10 can be arranged at the bottom, the head, or the tail of the vehicle 1. The battery device 10 can be used for power supply of the vehicle 1. For example, the battery device 10 can be used as an operating power supply of the vehicle 1, and is used for circuit systems of the vehicle 1, such as power consumption demand for starting, navigation, and running of the vehicle 1.

[0104] The vehicle 1 can further include a controller 1b and a motor 1a. The controller 1b is used to control the battery device 10 to supply power to the motor 1a, such as power consumption demand for starting, navigation, and running of the vehicle 1.

[0105] In some embodiments of the present application, the battery device 10 can not only be used as an operating power supply of the vehicle 1, but also be used as a driving power supply of the vehicle 1, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1.

[0106] Please refer to FIG. 2 and FIG. 3, FIG. 2 is a structural schematic diagram of a battery device 10 provided by an embodiment of the present application, and FIG. 3 is a structural schematic diagram of a battery module 20 in the battery device 10 provided by an embodiment of the present application. The battery device 10 comprises a box body 11 and a battery cell 30, and the battery cell 30 is accommodated in the box body 11. The box body 11 is used to provide an accommodation space for the battery cell 30, and the box body 11 can adopt various structures. In some embodiments, the box body 11 can comprise a first sub-box body 111 and a second sub-box body 112, the first sub-box body 111 and the second sub-box body 112 are mutually covered, and the first sub-box body 111 and the second sub-box body 112 jointly define an accommodation space for accommodating the battery cell 30. The second sub-box body 112 can be a hollow structure with one end open, and the first sub-box body 111 can be a plate-shaped structure, which is covered on the open side of the second sub-box body 112 to jointly define the accommodation space with the second sub-box body 112; the first sub-box body 111 and the second sub-box body 112 can also be hollow structures with one side open, and the open side of the first sub-box body 111 is covered on the open side of the second sub-box body 112.

[0107] In the battery device 10, the battery cell 30 can be multiple, and the multiple battery cells 30 can be connected in series, in parallel or in a mixed manner. The mixed manner means that the multiple battery cells 30 are connected in series and in parallel. The multiple battery cells 30 can be directly connected in series, in parallel or in a mixed manner, and then the whole of the multiple battery cells 30 is accommodated in the box body 11. Of course, the battery device 10 can also be that the multiple battery cells 30 are first connected in series, in parallel or in a mixed manner to form a battery module 20, and then the multiple battery modules 20 are connected in series, in parallel or in a mixed manner to form a whole, which is accommodated in the box body 11. The battery device 10 can also comprise other structures, for example, the battery device 10 can also comprise a current collecting component for realizing the electrical connection between the multiple battery cells 30.

[0108] The battery cell 30 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.

[0109] Please refer to FIG. 4, which is an exploded structural schematic diagram of the battery cell 30 in the battery device 10 provided by an embodiment of the present application. As shown in FIG. 4, the battery cell 30 comprises an outer shell 31, an electrode assembly 32 and an electrode terminal 33. The outer shell 31 comprises a shell body 311 and an end cover 312, the shell body 311 has an opening, and the end cover 312 closes the opening to isolate the internal environment of the battery cell 30 from the external environment.

[0110] The shell 311 is a component for fitting the end cover 312 to form an 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 shell 311 and the end cover 312 can be independent components. The shell 311 can be of various shapes and sizes. Specifically, the shape of the shell 311 can be determined according to the specific shape and size of the electrode assembly 32. The material of the shell 311 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0111] The end cover 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 cover 312 can be adapted to the shape of the shell 311 to fit the shell 311. Optionally, the end cover 312 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 312 is not easily deformed when subjected to extrusion collision, so that the battery cell 30 can have higher structural strength, and the reliability can also be improved. Functional components such as electrode terminals 33 can be provided on the end cover 312. The electrode terminals 33 can be used to electrically connect with the electrode assembly 32 for outputting or inputting the electrical energy of the battery cell 30. The material of the end cover 312 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not specially limited in the embodiments of the present application. In some embodiments, an insulating structure can also be provided on the inner side of the end cover 312, which can be used to isolate the electrical connection components in the shell 311 from the end cover 312 to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0112] The electrode assembly 32 is a component in which electrochemical reactions occur in the battery cell 30. One or more electrode assemblies 32 can be contained in the shell 311. The electrode assembly 32 is mainly formed by winding or stacking the positive and negative electrode sheets, and generally has a separator film between the positive and negative electrode sheets, which is used to separate the positive and negative electrode sheets to avoid internal short circuit of the positive and negative electrode sheets. The positive and negative electrode sheets have a part of active material constituting an electrode body 321 of the electrode assembly 32, and a part of the positive and negative electrode sheets without active material each constitutes a tab 322. The positive and negative tabs can be located together at one end of the electrode body 321 or at two ends of the electrode body 321, respectively. In the charging and discharging process of the battery cell 30, the positive and negative active materials react with the electrolyte, and the tabs 322 are connected to the electrode terminals 33 to form a current loop.

[0113] In a first aspect, as shown in FIG. 4, FIG. 5, FIG. 6 and FIG. 7, the battery device 10 provided by the present application comprises a first thermal management component 40 and a battery cell 30, the battery cell 30 comprising a housing 31 and a plurality of electrode terminals 33. The housing 31 comprises a second wall 314 and two first walls 313, the two first walls 313 being oppositely arranged along a first direction X, and the second wall 314 connecting the two first walls 313, the second wall 314 being oppositely arranged with the first thermal management component 40 along a second direction Y and being thermally connected. The size L of the housing 31 along the first direction X satisfies: 300mm≤L≤1600mm, and the first direction X is perpendicular to the second direction Y. The plurality of electrode terminals 33 comprises positive electrode terminals 331 and negative electrode terminals 332, and each first wall 313 is provided with at least one positive electrode terminal 331 and at least one negative electrode terminal 332. The minimum distance 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, and the size H of the housing 31 along the second direction Y satisfy: H / 5≤h1.

[0114] The size L of the housing 31 along the first direction X satisfies: 300mm≤L≤1600mm, and 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.

[0115] The inventor has found through systematic analysis and long-term practice that by setting 300mm≤L≤1600mm, the size of the battery cell 30 and the electrode assembly 32 inside the battery cell 30 along the first direction X can be increased, thereby improving the capacity of the battery cell 30 and improving the energy density of the battery cell 30.

[0116] Since the size L of the battery cell 30 along the first direction X is large, the battery cell 30 has a higher demand for the overcurrent capacity of the electrode terminals 33. Therefore, by setting each first wall 313 to be provided with at least one positive electrode terminal 331 and at least one negative electrode terminal 332, the path length of the current inside the battery cell 30 flowing between the positive electrode terminals 331 and the negative electrode terminals 332 can be reduced, thereby reducing the internal resistance of the battery cell 30 to reduce the heat generation of the battery cell 30.

[0117] Optionally, the first wall 313 can be provided with a positive electrode terminal 331 and a negative electrode terminal 332, or the first wall 313 can be provided with a plurality of positive electrode terminals 331 and a plurality of negative electrode terminals 332, which can be selected according to actual needs.

[0118] Optionally, the plurality of electrode terminals 33 on the first wall 313 can be arranged along the second direction Y, or the plurality of electrode terminals 33 on the first wall 313 can be arranged along a direction intersecting the second direction Y, for example, the plurality of electrode terminals 33 on the first wall 313 can be arranged along a direction perpendicular to the second direction Y.

[0119] The second wall 314 connects the two first walls 313, and the second wall 314 can be perpendicular to the first wall 313. Optionally, the second wall 314 can be a wall with a larger surface area among the plurality of wall portions of the shell 31 intersecting the first wall 313, or the second wall 314 can be a wall with a smaller surface area among the plurality of wall portions of the shell 31 intersecting the first wall 313.

[0120] The second wall 314 is opposite to the first thermal management component 40 along the second direction Y, and the normal of the second wall 314 can be the second direction Y, and the surface of the second wall 314 and the first thermal management component 40 can be arranged in parallel.

[0121] Optionally, the second wall 314 and the first thermal management component 40 can be attached to each other, or the second wall 314 and the second thermal management component 60 can be connected by heat-conducting glue or the like to enable the battery monomer 30 to exchange heat with the first thermal management component 40 through the second wall 314.

[0122] Optionally, the first thermal management component 60 can be a water-cooled plate or the like, and the first thermal management component 60 usually has a flow channel inside to flow cooling water or the like.

[0123] Optionally, the heat exchange between the second wall 314 and the first thermal management component 40 can be that the second wall 314 transmits heat to the first thermal management component 40 to dissipate heat from the battery monomer 30. Or, it can be that the first thermal management component 40 transmits heat to the battery monomer 30 through the second wall 314 to heat the battery monomer 30, for example, when the battery device 10 works in an extremely cold environment, the battery monomer 30 needs to be heated to work normally.

[0124] Optionally, the battery monomer 30 can only exchange heat through the second wall 314, or relevant thermal management components can also be arranged on other wall portions of the shell 31 to enable the battery monomer 30 to also exchange heat through other walls.

[0125] The plurality of electrode terminals 33 includes positive electrode terminals 331 and negative electrode terminals 332, and any one of the electrode terminals 33 can be a positive electrode terminal 331 or a negative electrode terminal 332. Different battery monomers 30 are connected in series or in parallel through the electrode terminals 33.

[0126] The minimum distance 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 can be the minimum distance between the electrode terminal 33 closest to the first thermal management component 40 on the first wall 313 and the first thermal management component 40 along the second direction Y. Alternatively, the minimum distance from the first thermal management component 40 along the second direction Y can be a positive electrode terminal 331 or a negative electrode terminal 332.

[0127] H / 5≤h1, and optionally, h can be 0.2H, 0.25H, 0.3H, 0.35H, 0.4H, 0.45H, or 0.5H, etc.

[0128] The inventor has found through systematic analysis and long-term practice that setting H / 5≤h1 is conducive to reducing the risk of electrode terminals 33 being short-circuited by the leaked cooling liquid in the first thermal management component 40, and improving the reliability of the battery device 10.

[0129] The battery device 10 provided by the embodiments of the present application sets the size L of the shell 31 along the first direction X to satisfy 300mm≤L≤1600mm, which is conducive to increasing the capacity and energy density of the battery monomer 30. In addition, at least one positive electrode terminal 331 and at least one negative electrode terminal 332 are arranged on each of the two first walls 313 opposite to each other along the first direction X, which is conducive to reducing the path length of the current flowing between the positive electrode terminals 331 and the negative electrode terminals 332, thereby reducing the internal resistance of the battery monomer 30 to reduce the heat generation of the battery monomer 30. In addition, the second wall 314 is arranged opposite to the first thermal management component 40 along the second direction Y and is in thermal conductive connection with the first thermal management component 40, and H / 5≤h1 is set, which is conducive to reducing the risk of the leaked cooling liquid in the first thermal management component 40 being short-circuited by the electrode terminals 33, thereby improving the reliability of the battery device 10.

[0130] In some embodiments, h1≤H / 2.

[0131] Thus, H / 5≤h1≤H / 2, and optionally, h1 can be 0.2H, 0.25H, 0.3H, 0.35H, 0.4H, 0.45H, or 0.5H, etc.

[0132] It can be understood that the greater the value of h1 is within a certain range, the more conducive it is to meet the insulation requirement of the electrode terminal 33, and the more conducive it is to reduce the risk of the electrode terminal 33 being in contact with the leaked cooling liquid. The smaller the value of h1 is within a certain range, the more space the first wall 313 has to arrange the electrode terminal 33 in the second direction Y, so as to facilitate the arrangement of the electrode terminal 33.

[0133] The inventor has found through systematic analysis and long-term practice that setting H / 5≤h1≤H / 2 is conducive to reducing the risk of the electrode terminal 33 being in contact with the leaked cooling liquid of the first thermal management component 40 and causing leakage, and is also conducive to increasing the space on the first wall 313 for arranging the electrode terminal 33, thereby facilitating the installation of the electrode terminal 33 and the first wall 313.

[0134] In some embodiments, H / 4≤h1≤H / 3.

[0135] For example, h1 can be 0.25H, 0.3H, or H / 3, etc.

[0136] The inventor has found through further systematic analysis and practice that setting H / 4≤h1≤H / 3 is further conducive to reducing the risk of the electrode terminal 33 being in contact with the leaked cooling liquid of the first thermal management component 40 and causing leakage, and is also conducive to increasing the space on the first wall 313 for arranging the electrode terminal 33, thereby facilitating the installation of the electrode terminal 33 and the first wall 313.

[0137] In some embodiments, the size of the battery cell 30 in the second direction Y is greater than the size in the third direction Z, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0138] In this way, the size H of the battery cell 30 in the second direction Y is larger, so the value of h1 can also be larger, which is further conducive to reducing the risk of the electrode terminal 33 being in contact with the leaked cooling liquid of the first thermal management component 40 and causing leakage of the battery cell 30.

[0139] In some embodiments, as shown in FIG. 8, the size d of the shell 31 in the third direction Z satisfies 10mm≤d≤30mm, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The electrode terminals 33 located on the same first wall 313 are staggered in the third direction Z.

[0140] 10mm≤d≤30mm, optionally, d can be 10mm, 11mm, 12mm, 13mm, 14,mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, or 30mm, etc.

[0141] If the electrode terminals 33 located on the first wall 313 are misaligned along the third direction Z, then the electrode terminals 33 located on the same first wall 313 are not arranged along the third direction Z. The orthographic projections of the electrode terminals 33 located on the first wall 313 along the third direction Z can 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.

[0142] Therefore, with this configuration, the size of the housing 31 along the third direction Z is smaller, and the space for arranging the electrode terminals 33 along the third direction Z of the housing 31 is smaller. By setting 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 also beneficial to increase the electrical clearance between the electrode terminals 33, and facilitate the arrangement of the electrode terminals 33 on the first wall 313.

[0143] In some embodiments, as shown in FIG8, different electrode terminals 33 disposed on any first wall 313 are spaced apart along the second direction Y.

[0144] Thus, each electrode terminal 33 has a large distance from the first thermal management component 40 along the second direction Y, which helps to further reduce the risk of leakage of the battery cell 30 caused by the contact between the electrode terminal 33 on the first wall 313 and the coolant leaked from the first thermal management component 40, and also helps to reduce the electrical clearance between the electrode terminals 33, thereby reducing the risk of internal short circuit in the battery cell 30.

[0145] In some embodiments, as shown in Figures 4 and 8, the battery cell 30 further includes an electrode assembly 32. The electrode assembly 32 includes an electrode body 321 and a plurality of tabs 322. The tabs 322 extend from the end of the electrode body 321 along a first direction X. The plurality of tabs 322 includes a positive tab 3221 and a negative tab 3222. The positive tab 3221 is electrically connected to the positive terminal 331, and the negative tab 3222 is electrically connected to the negative terminal 332. At least one positive tab 3221 and at least one negative tab 3222 extend from either end of the electrode body 321 along the first direction X.

[0146] If 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, then optionally, one positive electrode tab 3221 and one negative electrode tab 3222 can be led out from each end of the electrode body 321 along the first direction X, or multiple positive electrode tabs 3221 and multiple negative electrode tabs 3222 can be led out from each end of the electrode body 321 along the first direction X.

[0147] Since the size of the battery monomer 30 along the first direction X is large, the electrode body 321 also has a large size along the first direction X. By leading at least one positive electrode tab 3221 and at least one negative electrode tab 3222 at either end of the electrode body 321 along the first direction X, the current can flow to the positive electrode tab 322 or the negative electrode tab 322 at either end of the first direction X through a relatively short path during the circulation of the battery monomer 30, which is conducive to reducing the overcurrent path of the current flowing through the electrode body 321, and further conducive to reducing the heat generation of the battery monomer 30. In this way, it is conducive to improving the reliability of the battery monomer 30.

[0148] Optionally, the electrode assembly 32 can be in a wound shape, or the electrode assembly 32 can be in a laminated shape.

[0149] In some embodiments, the electrode assembly 32 is in a laminated shape.

[0150] Since the two ends of the electrode body 321 along the first direction X are both provided with the positive electrode tab 3221 and the negative electrode tab 3222, by arranging the electrode assembly 32 in a laminated shape, it is convenient to process the tabs 322 of the electrode assembly 32, and it is conducive to reducing the process difficulty of the preparation of the electrode assembly 32.

[0151] In some embodiments, as shown in FIGS. 7 and 8, the positive electrode terminal 331 provided on one first wall 313 is arranged opposite to the negative electrode terminal 332 provided on another first wall 313 along the first direction X, and the negative electrode terminal 332 provided on one first wall 313 is arranged opposite to the positive electrode terminal 331 provided on another first wall 313 along the first direction X.

[0152] In this way, the positive electrode terminal 331 and the negative electrode terminal 332 of the opposite two first walls 313 of the same battery monomer 30 are opposite.

[0153] After the battery monomers 30 are arranged along the direction perpendicular to the first direction X and the second direction Y, one of the two adjacent battery monomers 30 is rotated 180° around the axis parallel to the second direction Y relative to the other, and then the positive electrode terminal 331 and the negative electrode terminal 332 of the two adjacent battery monomers 30 along the same end of the first direction X are adjacent along the second direction Y. In this way, it is conducive to reducing the electrical connection path of the two adjacent battery monomers 30, and further conducive to simplifying the electrical connection structure of the battery monomer 30.

[0154] In some embodiments, as shown in FIG. 8, a plurality of battery monomers 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 electrode terminals 331 and the negative electrode terminals 332 of the plurality of battery monomers 30 are arranged alternately along the third direction Z.

[0155] The plurality of battery cells 30 are arranged along the third direction Z, and since the positive terminal 331 and the negative terminal 332 on the opposite first wall 313 of 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 plurality of battery cells 30 are alternately arranged along the third direction Z.

[0156] The positive terminal 331 and the negative terminal 332 of the plurality of battery cells 30 are alternately arranged along the third direction Z, so that between any two adjacent positive terminals 331 along the third direction Z, there is and only one negative terminal 332, and between any two adjacent negative terminals 332 along the third direction Z, there is and only one positive terminal 331.

[0157] Therefore, in this way, the electrical connection path of the adjacent two battery cells 30 is reduced, and the electrical connection structure of the battery cell 30 is simplified.

[0158] In some embodiments, as shown in FIGS. 9 and 11, the battery device 10 further comprises a busbar 50, the busbar 50 electrically connecting the adjacent positive terminal 331 and negative terminal 332 along the third direction Z.

[0159] Since the positive terminal 331 and the negative terminal 332 of the adjacent battery cell 30 along the third direction Z are adjacent along the third direction Z, and the spacing between the adjacent positive terminal 331 and the negative terminal 332 along the third direction Z is small, the busbar 50 connects the adjacent positive terminal 331 and the negative terminal 332, which is beneficial to reduce the connection path of the busbar 50, and is beneficial to simplify the structure of the busbar 50 and facilitate the electrical connection between the busbar 50 and the electrode terminal 33, and in this way, the reliability of the battery device 10 is further improved.

[0160] In some embodiments, as shown in FIGS. 9 and 11, the battery device 10 further comprises a busbar 50, the busbar 50 electrically connecting the adjacent positive terminal 331 and negative terminal 332 along the third direction Z.

[0161] Alternatively, e can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, or 4 mm, etc.

[0162] Since the size L of the battery cell 30 along the first direction X is large, and the capacity of the battery cell 30 is large, the overcurrent capacity requirement of the battery cell 30 on the busbar 50 is high,

[0163] It can be understood that the greater the e is, the more conducive to improving the current-carrying capacity of the busbar 50, and the smaller the value of e is, the more conducive to the welding connection of the busbar 50 and the electrode terminal 33, and the more conducive to reducing the space occupied by the busbar 50, thereby improving the energy density of the battery device 10.

[0164] The inventor found through systematic analysis and long-term practice that setting 1mm≤e≤4mm is conducive to improving the current-carrying capacity of the busbar 50 and reducing the space occupied by the busbar 50, thereby improving the energy density of the battery device 10.

[0165] In some embodiments, 1.5mm≤e≤3.5mm.

[0166] Alternatively, e can be 1.5mm, 2mm, 2.5mm, 3mm or 3.5mm, etc.

[0167] The inventor found through further systematic analysis and long-term practice that setting 1.5mm≤e≤3.5mm is conducive to further improving the current-carrying capacity of the busbar 50 and further reducing the space occupied by the busbar 50, thereby further improving the energy density of the battery device 10.

[0168] In some embodiments, as shown in FIGS. 9 and 10, the battery device 10 further includes a busbar 50 electrically connecting two adjacent battery monomers 30, the busbar 50 includes a folded multi-layer busbar sheet layer 51, the stacking direction of the multi-layer busbar sheet layer 51 is the first direction X, and the ends of two adjacent layers in the multi-layer busbar sheet layer 51 in the second direction Y are connected to each other. The multi-layer busbar sheet layer 51 includes a first sub-layer 511 and at least one second sub-layer 512, the second sub-layer 512 is arranged on the side of the first sub-layer 511 away from the electrode terminal 33, and the second sub-layer 512 has a through hole 512a, and the through hole 512a is arranged opposite to the electrode terminal 33.

[0169] The multi-layer busbar sheet layer 51 includes a first sub-layer 511 and at least one second sub-layer 512, and optionally, the multi-layer busbar sheet layer 51 can include one first sub-layer 511 and one, two, three or more second sub-layers 512, which can be set according to actual needs.

[0170] It can be understood that the greater the thickness of the busbar 50 is, the more conducive to improving the current-carrying capacity of the busbar 50. And the smaller the thickness of the busbar 50 is, the more conducive to the welding connection of the busbar 50 and the electrode terminal 33.

[0171] The busbar 50 comprises the plurality of busbar layers 51, and the plurality of busbar layers 51 are arranged in a stack along the first direction X, which is conducive 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 arranging the second sub-layer 512 to have the through hole 512a, and arranging the through hole 512a to be opposite to the electrode terminal 33, the part of the first sub-layer 511 opposite to the through hole 512a can be welded and connected with the electrode terminal 33 during the welding of the busbar 50 and the electrode terminal 33, so as to facilitate the welding connection of the busbar 50 and the electrode terminal 33.

[0172] Therefore, the busbar 50 comprises the plurality of busbar layers 51, and the second sub-layer 512 has the through hole 512a, which is arranged opposite to the electrode terminal 33, which is conducive to improving the current carrying capacity of the busbar 50 while reducing the process difficulty of the welding connection of the busbar 50 and the electrode terminal 33.

[0173] In some embodiments, as shown in FIG. 8, the size L1 of the electrode terminal 33 along the second direction Y satisfies: 25mm≤L1≤35mm.

[0174] Alternatively, L1 can be 25mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm or 35mm, etc.

[0175] It can be understood that the larger the size L1 of the electrode terminal 33 along the second direction Y, the more conducive to improving the current carrying capacity of the electrode terminal 33, and the smaller the size L1 of the electrode terminal 33 along the second direction Y, the more conducive to reducing the volume of the electrode terminal 33, and there is enough space on the first wall 313 to arrange the electrode terminal 33.

[0176] The inventor has found through systematic analysis and long-term practice that arranging 25mm≤L1≤35mm is conducive to improving the current carrying capacity of the electrode assembly 32 while reducing the space occupied by the electrode terminal 33, so as to improve the energy density of the battery device 10, and facilitate the arrangement of the electrode terminal 33 on the first wall 313.

[0177] In some embodiments, as shown in FIG. 8, the size L2 of the electrode terminal 33 along the third direction Z satisfies: 12mm≤L2≤15mm, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0178] Similarly, the greater the dimension L2 of the electrode terminal 33 along the third direction Z, the more conducive to improving the overcurrent capacity of the electrode terminal 33, and the smaller the dimension L2 of the electrode terminal 33 along the third direction Z, the more conducive to reducing the volume of the electrode terminal 33, and there is enough space on the first wall 313 to arrange the electrode terminal 33.

[0179] The inventor found through systematic analysis and long-term practice that setting 12mm≤L2≤15mm is conducive to improving the overcurrent capacity of the electrode assembly 32 while reducing the space occupied by the electrode terminal 33, thereby improving the energy density of the battery device 10 and facilitating the arrangement of the electrode terminal 33 on the first wall 313.

[0180] In some embodiments, as shown in FIG. 7, the shell 31 has a third wall 315, the third wall 315 is arranged opposite to the second wall 314 along the second direction Y, and 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, h2≥3mm.

[0181] h2≥3mm, and optionally, h2 can be 3mm, 4mm, or 5mm, etc.

[0182] The side of the third wall 315 is not provided with a related thermal management component, so there is no insulation requirement for the electrode terminal 33 on the first wall 313 close to the third wall 315, therefore, h2 can be smaller than h1. However, considering the manufacturing process of the electrode terminal 33, the value of h2 is relatively large, which can provide enough space for the arrangement of the electrode terminal 33 and facilitate the welding connection and sealing of the electrode terminal 33 and the first wall 313.

[0183] Therefore, the inventor found through systematic analysis and long-term practice that setting h2≥3mm facilitates the welding of the electrode terminal 33 and the first wall 313, and facilitates the sealing of the connection between the electrode terminal and the first wall 313, which is conducive to reducing the process difficulty of the battery monomer 30.

[0184] In some embodiments, as shown in FIG. 11, the shell 31 includes a third wall 315, the third wall 315 is arranged opposite to the second wall 314 along the second direction Y, and the battery device 10 further includes a second thermal management component 60, the second thermal management component 60 is arranged opposite to the third wall 315 along the second direction Y and is in thermal conduction connection, and the minimum distance between the plurality of electrode terminals 33 on the first wall 313 and the second thermal management component 60 along the second direction Y is h3, H / 5≤h3≤H / 2.

[0185] Optionally, h3 can be 0.2H, 0.25H, 0.3H, 0.35H, 0.4H, 0.45H, or 0.5H, etc.

[0186] By setting the second thermal management component 60, and setting the second thermal management component 60 and the third wall 315 to be opposite to each other along the second direction Y and to be in thermal conduction connection, heat exchange of the battery monomer 30 can be performed by the first thermal management component 40 and the second thermal management component 60, so as to improve the heat dissipation efficiency of the battery monomer 30.

[0187] By setting H / 5≤h3≤H / 2, the risk of the battery monomer 30 being short-circuited due to the cooling liquid leaked from the second thermal management component 60 being in contact with the electrode terminal 33 can be reduced.

[0188] Therefore, through systematic analysis and long-term practice, the inventor finds that by setting the second thermal management component 60 and H / 5≤h3≤H / 2, the heat exchange rate of the battery monomer 30 can be improved, and the risk of the battery monomer 30 being short-circuited due to the cooling liquid being in contact with the electrode terminal 33 can be further reduced.

[0189] In some embodiments, as shown in FIGS. 7 and 11, the first thermal management component 40 and the second wall 314 are in contact with each other.

[0190] In this way, the heat exchange efficiency of the first thermal management component 40 and the battery monomer 30 can be improved, and the reliability of the battery monomer 30 can be further improved.

[0191] In some embodiments, as shown in FIG. 7, 90mm≤H≤120mm.

[0192] Alternatively, H can be 90mm, 95mm, 100mm, 105mm, 110mm, 115mm or 120mm, etc.

[0193] It can be understood that the larger the size H of the battery monomer 30 along the second direction Y, the more conducive to improving the energy density of the battery monomer 30, and the smaller the size H of the battery monomer 30 along the second direction Y, the shorter the distance of heat of each part of the battery monomer 30 being transferred to the first thermal management component 40 along the second direction Y, and the more conducive to reducing the temperature difference inside the battery monomer 30 and providing the consistency of the temperature of the battery monomer 30.

[0194] Through systematic analysis and long-term practice, the inventor finds that by setting 90mm≤H≤120mm, the energy density of the battery monomer 30 can be improved, and the temperature consistency of the battery monomer 30 can also be improved.

[0195] In a second aspect, the power consumption device provided by the embodiments of the present application includes the battery device 10 provided by any of the above embodiments, and the battery device 10 is used to provide electric energy.

[0196] The battery device 10 provided by the embodiments of the present application has the same technical effects as the electric device provided by any of the above embodiments, and thus will not be described here again.

[0197] In some embodiments, as shown in FIGS. 4-11, the battery device 10 provided by the embodiments of the present application includes a first thermal management component 40, a battery cell 30, and a busbar 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 oppositely arranged along a first direction X, the second wall 314 connects the two first walls 313, and the second wall 314 is oppositely arranged with the first thermal management component 40 along a second direction Y and is in thermal conduction connection. The size L of the housing 31 along the first direction X satisfies: 300mm≤L≤1600mm, the size d of the housing 31 along a third direction Z satisfies: 10mm≤d≤30mm, the size of the battery cell 30 along the second direction Y is greater than the size along the third direction Z, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The plurality of electrode terminals 33 includes positive electrode terminals 331 and negative electrode terminals 332, and each first wall 313 is provided with at least one positive electrode terminal 331 and at least one negative electrode terminal 332. The minimum distance of the plurality of electrode terminals 33 on the first wall 313 from the first thermal management component 40 along the second direction Y is h1, the size of the housing 31 along the second direction Y is H, and H / 5≤h1≤H / 2. The different electrode terminals 33 provided on any first wall 313 are arranged at intervals along the second direction Y. The electrode assembly 32 includes an electrode body 321 and a plurality of tabs 322, the tabs 322 are led out from the end of the electrode body 321 along the first direction X, the plurality of tabs 322 includes positive electrode tabs 3221 and negative electrode tabs 3222, the positive electrode tabs 3221 are electrically connected with the positive electrode terminals 331, and the negative electrode tabs 3222 are electrically connected with the negative electrode terminals 332. At least one positive electrode tab 3221 and at least one negative electrode tab 3222 are led out from any end of the electrode body 321 along the first direction X. The positive electrode terminals 331 provided on one first wall 313 are oppositely arranged with the negative electrode terminals 332 provided on another first wall 313 along the first direction X, and the negative electrode terminals 332 provided on one first wall 313 are oppositely arranged with the positive electrode terminals 331 provided on another first wall 313 along the first direction X. The plurality of battery cells 30 are arranged along the third direction Z, the positive electrode terminals 331 and the negative electrode terminals 332 of the plurality of battery cells 30 are alternately arranged along the third direction Z, and the busbar 50 is electrically connected with the positive electrode terminals 331 and the negative electrode terminals 332 adjacent along the third direction Z. The thickness e of the busbar 50 satisfies: 1mm≤e≤4mm. The size L1 of the electrode terminal 33 along the second direction Y satisfies: 25mm≤L1≤35mm, and the size L2 of the electrode terminal 33 along the third direction Z satisfies: 12mm≤L2≤15mm. The third wall 315 is oppositely arranged with the second wall 314 along the second direction Y, the minimum distance of the plurality of electrode terminals 33 from the outer surface of the third wall 315 along the second direction Y is h2, and h2≥3mm. The first thermal management component 40 is in close contact with the second wall 314.

[0198] The battery device 10 provided by the embodiments of the present application has the following advantages. The size L of the shell 31 along the first direction X satisfies 300mm≤L≤1600mm, so that the size of the shell 31 along the first direction X is large, which is beneficial to improve the capacity and energy density of the battery monomer 30. At least one positive electrode terminal 331 and at least one negative electrode terminal 332 are arranged on each of the two first walls 313 opposite to each other along the first direction X, which is beneficial to reduce the path length of the current flowing between the positive electrode terminal 331 and the negative electrode terminal 332, thereby reducing the internal resistance of the battery monomer 30, so as to reduce the heat generation of the battery monomer 30. The second wall 314 is arranged opposite to the first heat management component 40 along the second direction Y and is in thermal conduction connection, and H / 5≤h1 is satisfied, which is beneficial to reduce the risk of the battery monomer 30 being short-circuited due to the overlap between the leaked cooling liquid in the first heat management component 40 and the electrode terminal 33, and is further beneficial to improve the reliability of the battery device 10.

[0199] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to the present application and equivalents thereof without departing from the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, comprising: a first thermal management component; a battery cell, comprising a housing and a plurality of electrode terminals, the housing comprising two first walls and a second wall, the two first walls being oppositely arranged along a first direction, the second wall connecting the two first walls, the second wall being oppositely arranged with the first thermal management component along a second direction and being thermally connected therewith; a dimension L of the housing along the first direction satisfying 300mm≤L≤1600mm, the first direction and the second direction being perpendicular to each other; the plurality of electrode terminals comprising positive electrode terminals and negative electrode terminals, each of the first walls being provided with at least one positive electrode terminal and at least one negative electrode terminal; a minimum distance h1 between the plurality of electrode terminals on the first wall and the first thermal management component along the second direction, a dimension H of the housing along the second direction satisfying H / 5≤h1.

2. The battery device of claim 1, wherein, h1≤H / 2.

3. The battery device of claim 2, wherein, H / 4≤h1≤H / 3.

4. The battery device according to any one of claims 1 to 3, wherein a dimension of the battery cell along the second direction being greater than a dimension of the battery cell along a third direction, the first direction, the second direction and the third direction being perpendicular to each other; 5. The battery device according to any one of claims 1 to 4, wherein a dimension d of the housing along the third direction satisfying 10mm≤d≤30mm, the first direction, the second direction and the third direction being perpendicular to each other; the electrode terminals on the same first wall being staggered along the third direction.

6. The battery device according to any one of claims 1 to 5, wherein the different electrode terminals on any of the first walls being spaced apart along the second direction.

7. The battery device according to any one of claims 1 to 6, wherein the battery cell further comprising an electrode assembly, the electrode assembly comprising an electrode body and a plurality of tabs, the tabs being led out from ends of the electrode body along the first direction, the plurality of tabs comprising positive tabs and negative tabs, the positive tabs being electrically connected with the positive electrode terminals, the negative tabs being electrically connected with the negative electrode terminals; any end of the electrode body along the first direction leading out at least one positive tab and at least one negative tab.

8. The battery device of claim 7, wherein, the electrode assembly being in a laminated shape.

9. The battery device according to any one of claims 1 to 8, wherein the positive electrode terminals on one of the first walls being oppositely arranged with the negative electrode terminals on another of the first walls along the first direction, the negative electrode terminals on one of the first walls being oppositely arranged with the positive electrode terminals on another of the first walls along the first direction.

10. The battery device of claim 9, wherein, a plurality of the battery cells being arranged along a third direction, the first direction, the second direction and the third direction being perpendicular to each other, the positive electrode terminals and the negative electrode terminals of the plurality of battery cells being alternately arranged along the third direction.

11. The battery device of claim 10, wherein, the battery device further comprising a busbar electrically connecting the positive electrode terminals and the negative electrode terminals adjacent along the third direction.

12. The battery device according to any one of claims 1 to 10, wherein the battery device further comprising a busbar electrically connecting two adjacent battery cells, a thickness e of the busbar satisfying 1mm≤e≤4mm.

13. The battery device of claim 12, wherein, 1.5mm≤e≤3.5mm.

14. The battery device according to any one of claims 1 to 10, wherein The battery device further comprises a busbar electrically connecting two adjacent battery monomers, the busbar comprising a plurality of folded busbar sheet layers, the plurality of busbar sheet layers being stacked in the first direction, and two adjacent busbar sheet layers being connected at their ends in the second direction; The plurality of busbar sheet layers comprises a first sub-layer and at least one second sub-layer, the second sub-layer being arranged on a side of the first sub-layer opposite to the electrode terminal, the second sub-layer having a through hole, and the through hole being arranged opposite to the electrode terminal.

15. The battery device according to any one of claims 1 to 14, wherein, The electrode terminal has a dimension L1 in the second direction satisfying 25mm≤L1≤35mm, and / or a dimension L2 in the third direction satisfying 12mm≤L2≤15mm, the first direction, the second direction and the third direction being perpendicular to each other.

16. The battery device according to any one of claims 1 to 15, wherein The housing has a third wall arranged opposite to the second wall in the second direction, and a minimum distance between the plurality of electrode terminals and an outer surface of the third wall in the second direction is h2, h2≥3mm.

17. The battery device of any one of claims 1 to 15, wherein, The housing comprises a third wall arranged opposite to the second wall in the second direction, and the battery device further comprises a second thermal management component arranged opposite to the third wall in the second direction and thermally connected to the third wall, and a minimum distance between the plurality of electrode terminals on the first wall and the second thermal management component in the second direction is h3, H / 5≤h3≤H / 2.

18. The battery device of any one of claims 1-17, wherein, The first thermal management component is in contact with the second wall.

19. The battery device of any one of claims 1-18, wherein, 90mm≤H≤120mm.

20. An electric device comprising the battery device according to any one of claims 1 to 19, the battery device being configured to provide electric energy.

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