Battery device and electric device

Abstract

The application provides a battery device and an electric device. The battery device comprises a battery box, a plurality of battery cell assemblies, a first electric connector and a second electric connector. The battery box has a receiving cavity. The battery cell assemblies are arranged in the receiving cavity and are arranged along a first direction. Each battery cell assembly comprises a plurality of battery cells arranged along a second direction. Different battery cell assemblies are connected by the first electric connector. At least part of the first electric connector is arranged on one side of the battery cell assemblies along a third direction. The battery cells in the same battery cell assembly are connected by at least one second electric connector. The first electric connector comprises a main body section and a connecting section. The main body section extends along the first direction and is at least partially arranged outside the battery cell assemblies along the second direction. The two ends of the main body section along the first direction are provided with the connecting sections. The connecting sections are connected with different battery cell assemblies. The size of the connecting sections along the third direction is smaller than the size of the main body section along the third direction.

Description

Technical Field

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

[0002] With the promotion and popularization of the concept of green development, new energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, battery devices are being used more and more in the field of energy storage.

[0003] In existing power battery systems, the first electrical connector, as a key conductive component connecting battery modules or cells, primarily functions to achieve stable transmission of high current. To meet the demands of electrical devices for high-rate charging and discharging and high-power output, the first electrical connector must possess sufficient overcurrent capacity to reduce resistance losses and improve system efficiency. In related technologies, increasing the overcurrent cross-sectional area of ​​the first electrical connector improves its conductivity, but this may reduce the reliability of the electrical connection. Therefore, balancing the overcurrent capacity and electrical connection reliability of the first electrical connector is one of the research directions in the industry. Utility Model Content

[0004] In view of this, this application aims to provide a battery device and an electrical device that can balance the overcurrent capacity of the first electrical connector and the reliability of the electrical connection.

[0005] To achieve the above objectives, embodiments of this application provide a battery device, the battery device comprising:

[0006] Battery box, the battery box having a receiving cavity;

[0007] Multiple battery cell assemblies are disposed within the receiving cavity and arranged along a first direction, and at least one of the battery cell assemblies includes multiple battery cells arranged along a second direction.

[0008] At least one first electrical connector, through which different battery cell assemblies are connected, and at least a portion of the first electrical connector is disposed on one side of the battery cell assembly along a third direction;

[0009] At least one second electrical connector, wherein the battery cells within the same battery cell assembly are connected via the at least one second electrical connector;

[0010] The first electrical connector includes a main body segment and a connecting segment connected to each other. The main body segment extends along the first direction and is at least partially located outside the battery cell assembly along the second direction. The connecting segment is provided at both ends of the main body segment along the first direction. The connecting segment is connected to different battery cell assemblies, and the dimension of the connecting segment in the third direction is smaller than the dimension of the main body segment in the third direction.

[0011] The first direction, the second direction, and the third direction intersect each other.

[0012] The battery device provided in this application embodiment includes a first electrical connector comprising a main body segment and a connecting segment. The dimension of the connecting segment in the third direction is smaller than that of the main body segment in the third direction. This means that the smaller connecting segment connects to individual battery cells in different battery cell assemblies, thus improving the electrical connection reliability of the first electrical connector. For example, when the connecting segment is welded to the terminal post of a battery cell, setting the dimension of the connecting segment in the third direction to be smaller than that of the main body segment in the third direction can, to some extent, avoid problems such as thermal cracking and porosity caused by excessive thickness of the connecting segment, improving welding quality and reliability. Conversely, increasing the dimension of the main body segment in the third direction increases the current-carrying cross-sectional area of ​​the first electrical connector, thereby improving its current-carrying capacity and reducing resistance loss. The battery device provided in this application embodiment can balance the current-carrying capacity and electrical connection reliability of the first electrical connector.

[0013] In one embodiment, the first electrical connector includes an electrical connector plate and a folding portion, wherein the folding portion is integrally folded from one side of the electrical connector plate along the second direction, and the folding portion is stacked on one side surface of the electrical connector plate along the third direction; and the overlapping area of ​​the folding portion and the electrical connector plate forms the main body segment.

[0014] The folding section is compatible with existing process equipment, eliminating the need to develop special molds or tooling. Existing bending equipment can be directly reused to fold the electrical connection plate along one side of the second direction to form the folding section. The structure is stable after bending and requires no subsequent correction or heat treatment. In other words, the structure is simple, reliable, and easy to form.

[0015] In one embodiment, the first electrical connector includes an electrical connector plate and a separately disposed laminate, the laminate being stacked on one side surface of the electrical connector plate along the third direction; the overlapping area of ​​the laminate and the electrical connector plate forms the main body segment.

[0016] The structure is simple, easy to mold, and helps reduce production costs.

[0017] In one embodiment, the first electrical connector includes an electrical connection plate that integrally protrudes from at least a portion of one side surface along the third direction to form the main body segment.

[0018] The structure is simple, easy to mold, and helps reduce production costs.

[0019] In one embodiment, the first electrical connector includes an electrical connection plate, a portion of which is thinned to form the connection segment, and other portions of which form the main body segment.

[0020] By thinning a portion of the electrical connection plate to form the connection segment, and leaving the unthinned portion to form the main body segment, the structure is simple, easy to form, and helps reduce production costs.

[0021] In one embodiment, the main body segment has a dimension of 3mm-30mm in the second direction.

[0022] It can balance the current carrying capacity of the first electrical connector with the required assembly space, and minimize the impact of the first electrical connector on other components (such as cooling plate, end plate, and connecting bolts).

[0023] In one embodiment, the main body segment has a dimension of 2.2mm-5.2mm in the third direction.

[0024] It can balance the current carrying capacity of the first electrical connector with the required assembly space, and facilitates the insulation of the first electrical connector.

[0025] In one embodiment, the difference in size between the main body segment and the connecting segment in the third direction is 0.2mm-4.2mm.

[0026] It can take into account the connection reliability, overcurrent capacity and required assembly space of the first electrical connector, and facilitates the insulation setting of the first electrical connector.

[0027] In one embodiment, the battery device further includes a separator plate located between the battery cell and the first electrical connector, the separator plate having a groove, and the main body segment disposed within the groove.

[0028] In other words, the thickened main body section can be covered by a partition plate without additional insulation treatment, thus improving current carrying capacity while taking into account cost and production efficiency.

[0029] In one embodiment, the first electrical connector includes an electrical connection plate that protrudes from at least a portion of the third-party surface facing the battery cell, forming a main body segment of the first electrical connector.

[0030] By protruding at least a portion of the electrical connection plate on the third-party surface facing the battery cell, insulation can be achieved through the separator plate, thus preventing the first electrical connection from protruding on the surface away from the battery cell. This facilitates insulation and minimizes the space occupied in the battery box.

[0031] A second aspect of this application provides an electrical device, including the battery device described above.

[0032] Since the electrical device includes the battery device provided above, it can take into account both the overcurrent capacity of the first electrical connector and the reliability of the electrical connection, thereby improving the reliability of the electrical device. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0034] Figure 2 This is a partial structural schematic diagram of a battery device according to some embodiments of this application;

[0035] Figure 3 for Figure 2 A cross-sectional view along the AA direction;

[0036] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0037] Figure 5 This is a schematic diagram of the structure of the first electrical connector according to the first embodiment of this application;

[0038] Figure 6 This is a schematic diagram of the structure of the first electrical connector according to the second embodiment of this application;

[0039] Figure 7 This is a schematic diagram of the structure of the first electrical connector according to the third embodiment of this application.

[0040] Explanation of reference numerals in the attached figures

[0041] 10. Battery cell assembly; 11. Battery cell; 111. Terminal post; 20. Battery box; 21. Receiving cavity; 30. First electrical connector; 31. Main body section; 32. Connecting section; 33. Transition section; 34. Folding part; 40. Separator plate; 41. Groove; 50. Second electrical connector; 100. Battery device; 200. Controller; 300. Motor; 1000. Vehicle. Detailed Implementation

[0042] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0044] In the description of the embodiments of this application, technical terms such as "first," "second," "third," and "fourth" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0045] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. Unless otherwise specified, all embodiments and optional embodiments of this application may be combined with each other to form new technical solutions. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will understand, explicitly and implicitly, that the embodiments described herein can be combined with other embodiments. Unless otherwise specified, all technical features and optional technical features of this application may be combined with each other to form new technical solutions.

[0046] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0047] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this 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, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0048] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0049] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0050] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "projection" refers to an orthographic projection in which parallel projection lines are perpendicular to the projection plane.

[0051] With the development of clean energy, more and more devices are using electricity as their driving force, leading to the rapid development of power batteries, such as lithium-ion batteries, which can store a large amount of electrical energy and can be repeatedly charged and discharged. These power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace, robotics, and many other fields.

[0052] The battery apparatus mentioned in the embodiments of this application may include multiple battery cells for providing voltage and capacity. The multiple battery cells are connected in series, parallel, or mixed connections via a busbar.

[0053] In some embodiments, a battery apparatus may include one or more battery cell assemblies. A battery cell assembly may include multiple battery cells connected in series, parallel, or in a mixed configuration via a busbar.

[0054] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, one or more battery cell assemblies can constitute a battery module, which is formed by arranging and fixing multiple battery cell assemblies together to form a single module. As an example, a battery module can be formed by bundling multiple battery cell assemblies together with cable ties.

[0055] In some embodiments, the battery device may be a battery pack, which includes a battery case and one or more individual battery cells housed within the battery case.

[0056] As an example, one or more battery cell components can constitute a battery module, and the battery cell components can be housed in a battery case by fixing the battery module in a battery case.

[0057] As an example, battery cell assemblies can also be housed in a battery box by directly fixing multiple battery cells to the battery box.

[0058] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0059] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0060] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During charging and / or discharging of the battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0061] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0062] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0063] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0064] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0065] In some embodiments, the electrode assembly has a stacked structure.

[0066] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0067] As an example, multiple positive electrode sheets can be set, and negative electrode sheets are folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0068] As an example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0069] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0070] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0071] In some embodiments, the electrode assembly may be cylindrical, flat, or polygonal, etc.

[0072] In some embodiments, the electrode assembly has tabs (not shown) that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0073] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0074] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells. There are no particular limitations in the embodiments of this application.

[0075] In some embodiments, a pressure relief mechanism is provided on the housing. The pressure relief mechanism is used to release the internal pressure of the battery cell.

[0076] In other embodiments, the pressure relief mechanism may also be referred to as an explosion-proof valve.

[0077] As an example, the internal pressure or temperature of a battery cell is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is broken, thereby creating an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell.

[0078] As an example, the pressure relief mechanism can be integrally molded with the housing.

[0079] As an example, the pressure relief mechanism can also be separately installed and connected to the housing.

[0080] The term "actuation" as used in this application refers to the activation or actuation of the pressure relief mechanism to a certain state, thereby releasing the internal pressure and temperature of the battery cell. The actions of the pressure relief mechanism may include, but are not limited to: movement of components within the mechanism to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the mechanism, etc. When the pressure relief mechanism is activated, the high-temperature, high-pressure substances inside the battery cell are discharged as waste from the activated portion. This method allows for pressure and temperature relief of the battery cell under controllable pressure or temperature, thereby preventing potentially more serious accidents.

[0081] The emissions from battery cells mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0082] In some embodiments, the housing is provided with electrode terminals, which pass through the housing and are electrically connected to the electrode assembly via tabs.

[0083] In some specific embodiments, the electrode terminals are made of conductive metal, such as copper or aluminum.

[0084] The "multiple" mentioned in the embodiments of this application refers to two or more.

[0085] In related technologies, the conductivity of the first electrical connector is improved by increasing its current-carrying cross-sectional area. For example, this can be achieved by increasing the overall size of the first electrical connector. However, this results in a larger assembly space required for the first electrical connector, which can lead to interference with other components (such as cooling plates, end plates, and connecting bolts), especially in battery devices with compact internal structures. This can affect the integration and lightweight design of the module. Furthermore, if the thickness of the first electrical connector is too large, the heat input requirement for laser welding increases significantly, potentially leading to an expanded heat-affected zone, porosity, cracks, and other defects. This results in reduced weld strength and reliability, and also places higher demands on equipment power (e.g., ≥3.5kW) and process control precision, further increasing production costs and process complexity. Therefore, balancing the current-carrying capacity of the first electrical connector with the reliability of the electrical connection is one of the research directions in the industry.

[0086] Research shows that if the first electrical connector is configured to include a main body segment and a connecting segment, and the dimension of the connecting segment in the third direction is set to be smaller than that of the main body segment in the third direction, the welding quality and welding reliability can be improved by connecting the connecting segment to the pole. The main body segment can be used to achieve stable transmission of large current, that is, to increase the current-carrying cross-sectional area, thereby improving the current-carrying capacity of the first electrical connector, thus balancing the current-carrying capacity and electrical connection reliability of the first electrical connector.

[0087] Based on this design concept, this application provides a battery device including a battery box, multiple battery cell assemblies, at least one first electrical connector, and at least one second electrical connector. The battery box has a receiving cavity. Multiple battery cell assemblies are disposed within the receiving cavity and arranged along a first direction. At least one battery cell assembly includes multiple battery cells arranged along a second direction. Different battery cell assemblies are connected by the first electrical connector, at least a portion of which is disposed on one side of the battery cell assembly along a third direction. Battery cells within the same battery cell assembly are connected by at least one second electrical connector. The first electrical connector includes a connected main body segment and a connecting segment. The main body segment extends along the first direction and is at least partially located outside the battery cell assembly along the second direction. Connecting segments are disposed at both ends of the main body segment along the first direction. The connecting segments connect to different battery cell assemblies, and the dimension of the connecting segment in the third direction is smaller than the dimension of the main body segment in the third direction. The first direction, the second direction, and the third direction intersect each other.

[0088] The battery device provided in this application embodiment includes a first electrical connector comprising a main body segment and a connecting segment. The dimension of the connecting segment in the third direction is smaller than that of the main body segment in the third direction. This means that the smaller connecting segment connects to individual battery cells in different battery cell assemblies, thus improving the electrical connection reliability of the first electrical connector. For example, when the connecting segment is welded to the terminal post of a battery cell, setting the dimension of the connecting segment in the third direction to be smaller than that of the main body segment in the third direction can, to some extent, avoid problems such as thermal cracking and porosity caused by excessive thickness of the connecting segment, improving welding quality and reliability. Conversely, increasing the dimension of the main body segment in the third direction increases the current-carrying cross-sectional area of ​​the first electrical connector, thereby improving its current-carrying capacity and reducing resistance loss. The battery device provided in this application embodiment can balance the current-carrying capacity and electrical connection reliability of the first electrical connector.

[0089] The technical solutions described in this disclosure are applicable to electrical devices that use battery devices. The electrical device includes the battery device according to any embodiment of this disclosure, and the battery device is used to provide electrical energy.

[0090] The battery devices provided in this application can be used, but are not limited to, in vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, robots, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This disclosure does not impose any special limitations on the above-mentioned electrical equipment.

[0091] It should be noted that the technical solutions described in this disclosure are not limited to the battery devices described above, but can also be applied to all electrical devices and energy storage devices that include battery devices.

[0092] In the following embodiments, for ease of explanation, an example of an electrical device according to an embodiment of this application is a vehicle.

[0093] Please see Figure 1The vehicle 1000 may contain a controller 200, a motor 300, and a battery device 100. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, it can serve as the operating power source for the vehicle 1000's electrical system, such as for the power requirements of starting, navigation, and operation. In another embodiment of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing fuel or natural gas to provide driving power to the vehicle 1000.

[0094] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0095] As an example, the battery box 20 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the battery box 20 forms an enclosed space to accommodate the battery cell assembly 10.

[0096] The battery box 20 can be a simple three-dimensional structure such as a cuboid, cylinder, or sphere, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres.

[0097] The battery box 20 is used to install the battery cell 11. The battery box 20 can carry the battery cell 11, and the battery cell 11 is installed to the electrical equipment through the battery box 20.

[0098] In some embodiments, the battery box 20 may be part of the chassis structure of the vehicle 1000. For example, a portion of the battery box 20 may be at least a portion of the floor of the vehicle 1000, or a portion of the battery box 20 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0099] For example, the battery box 20 is typically a cuboid structure. Both the length and width directions of the battery box 20 are parallel to the horizontal plane, and the length direction of the battery box 20 is parallel to the longest side of its cuboid structure. The height direction of the battery box 20 is perpendicular to the ground. For example, the height direction of the battery box 20 is a third direction, the length direction is a second direction, and the width direction is a first direction; or the height direction of the battery box 20 is a third direction, the width direction is a second direction, and the length direction is a first direction.

[0100] Below, refer to Figures 2 to 5 Some embodiments of this application will be described in detail.

[0101] In the description of the embodiments of this application, for ease of explanation, the direction where X is located is represented as the "first direction", the direction where Y is located is represented as the "second direction", and the direction where Z is located is represented as the "third direction". Among them, the third direction, the second direction and the first direction intersect each other.

[0102] In some embodiments, the third direction, the second direction, and the first direction are perpendicular to each other.

[0103] Please see Figures 2 to 5 This application provides a battery device 100, which includes a battery case 20, a plurality of battery cell assemblies 10, at least one first electrical connector 30, and at least one second electrical connector 50. The battery case 20 has a receiving cavity 21. The plurality of battery cell assemblies 10 are disposed within the receiving cavity 21 and arranged along a first direction. At least one battery cell assembly 10 includes a plurality of battery cells 11 arranged along a second direction. Different battery cell assemblies 10 are connected by the first electrical connector 30, at least a portion of which is disposed on one side of the battery cell assembly 10 along a third direction. Battery cells 11 within the same battery cell assembly 10 are connected by at least one second electrical connector 50. The first electrical connector 30 includes a main body segment 31 and a connecting segment 32 connected to each other. The main body segment 31 extends along a first direction and is at least partially located on the outer side of the battery cell assembly 10 along a second direction. The connecting segments 32 are provided at both ends of the main body segment 31 along the first direction. The connecting segments 32 are connected to different battery cell assemblies 10, and the dimension of the connecting segment 32 in a third direction is smaller than the dimension of the main body segment 31 in the third direction. The first direction, the second direction, and the third direction intersect each other.

[0104] In some embodiments, such as Figure 2 As shown, the battery box 20 includes a box body and a cover. The box body has an opening that opens in a third direction. The box body and the cover are aligned in the third direction, and the cover closes the opening of the box body. The receiving cavity 21 can accommodate the battery cell assembly 10.

[0105] Optionally, the battery cell assembly 10 can be two, three or more, etc.

[0106] In some embodiments, please refer to Figures 2 to 3 The battery cell assembly 10 includes a plurality of battery cells 11 arranged along a second direction.

[0107] For example, the third direction is the height direction of the battery cell 11 and the battery assembly 100. Thus, the first electrical connector 30 is disposed on the top of the battery cell 11.

[0108] Here, different battery cell assemblies 10 are connected by a first electrical connector 30, and battery cells 11 within the same battery cell assembly 10 are connected by a second electrical connector 50.

[0109] For example, the thickness direction of the first electrical connector 30 is also a third direction.

[0110] For example, different battery cell assemblies 10 are connected in parallel or in series via a first electrical connector 30.

[0111] For example, the battery cell assembly 10 may be one of the battery cells 11 located at the end in the second direction connected to other battery cell assemblies 10 via the first electrical connector 30, or it may be two battery cells 11 located at the end in the second direction connected to other battery cell assemblies 10 via the first electrical connector 30 respectively.

[0112] It should be noted that there is no limit to the number of the first electrical connectors 30.

[0113] The number of first electrical connectors 30 corresponds to the number of battery cell assemblies 10. For example, the number of battery cell assemblies 10 is 6 and the number of first electrical connectors 30 is 3.

[0114] It should be noted that the first electrical connector 30 can also be called a jumper plate.

[0115] Please see Figure 4 By setting the dimension L1 of the connecting segment 32 in the third direction to be smaller than the dimension L2 of the main body segment 31 in the third direction, that is, the thickness of the connecting segment 32 is smaller than the thickness of the main body segment 31, the cross-sectional area of ​​the first electrical connector 30 is increased by thickening a portion of the first electrical connector 30 (the main body segment 31). Compared to thickening the entire first electrical connector 30, this can reduce the assembly space required for the first electrical connector 30 to a certain extent, thereby improving the situation where the first electrical connector 30 interferes with other components (such as cooling plates, end plates, and connecting bolts). This facilitates the integration and lightweight design of the battery device 100. Furthermore, when the thickened first electrical connector 30 is exposed and exceeds the coverage of the blister pack 40 or the insulating sleeve, additional insulation measures are required. This can, to some extent, reduce the need for additional insulation measures, such as heat shrink tubing, insulating tape, and sprayed insulating coating. This not only reduces material costs but also avoids the introduction of new process steps (such as winding, curing, and testing), improves problems such as incomplete insulation, detachment, and aging, thereby avoiding potential short-circuit risks and enhancing the long-term safety of the battery system.

[0116] In addition, by setting the dimension of the connecting section 32 in the third direction to be smaller than the dimension of the main body section 31 in the third direction, the defects such as expansion of the heat-affected zone, porosity, and cracks caused by the excessive thickness of the first electrical connector 30 during the welding process can be improved, which leads to a decrease in weld strength and reliability. At the same time, it places higher demands on equipment power (such as ≥3.5kW) and process control precision, further increasing production costs and process complexity.

[0117] The main body segment 31 is at least partially located on the outer side of the battery cell assembly 10 along the second direction. That is, the main body segment 31 may be partially located on the outer side of the battery cell assembly 10 along the second direction, or it may be entirely located on the outer side of the battery cell assembly 10 along the second direction. In this way, the space occupied by the main body segment 31 above the battery cell assembly 10 can be minimized, thereby minimizing the impact of the first electrical connector 30 on other adjacent components.

[0118] In an embodiment where the entire main body segment 31 is located on the outer side of the battery cell assembly 10 along the second direction, the orthographic projection of the main body segment 31 and the orthographic projection of the battery cell assembly 10 do not overlap on a projection plane perpendicular to the third direction.

[0119] In some embodiments, please refer to Figure 4 The first electrical connector 30 includes an electrical connector plate, at least a portion of which protrudes to form a main body segment 31.

[0120] In some embodiments, all areas of the electrical connection plate other than the main body section 31 are connection sections 32.

[0121] In other embodiments, please refer to Figure 4 , Figure 6 and Figure 7 The electrical connection plate may also include a transition section 33, through which the connecting section 32 is connected to the main body section 31. The dimension of the connecting section 32 in the third direction is larger than that of the main body section 31 in the third direction.

[0122] There are several ways to connect the connecting section 32 to the pole post 111. As an example, the connecting section 32 is welded to the pole post 111.

[0123] The battery device 100 provided in this application embodiment includes a first electrical connector 30 comprising a main body segment 31 and a connecting segment 32 connected to each other. The dimension of the connecting segment 32 in the third direction is smaller than that of the main body segment 31 in the third direction. This means that by connecting the smaller connecting segment 32 to the battery cells 11 in different battery cell assemblies 10, the electrical connection reliability of the first electrical connector 30 can be improved. For example, the connecting segment 32 is welded to the terminal post 111 of the battery cell 11. By setting the dimension of the connecting segment 32 in the third direction to be smaller than that of the main body segment 31 in the third direction, problems such as thermal cracking and porosity caused by excessive thickness of the connecting segment 32 can be avoided to a certain extent, improving welding quality and reliability. Conversely, by increasing the dimension of the main body segment 31 in the third direction, the current-carrying cross-sectional area of ​​the first electrical connector 30 is increased, thereby improving the current-carrying capacity of the first electrical connector 30 and reducing resistance loss. The battery device 100 provided in this application embodiment can balance the current-carrying capacity and electrical connection reliability of the first electrical connector 30.

[0124] Furthermore, by increasing the size of the main body segment 31 in the third direction, the size of the first electrical connector 30 in other directions can be reduced, thereby minimizing the impact of the first electrical connector 30 on other adjacent components.

[0125] It should be noted that the first electrical connector 30 has various structural forms.

[0126] In some embodiments, please refer to Figure 4 The first electrical connector 30 includes an electrical connector plate and a folded portion 34. The folded portion 34 is integrally folded from one side of the electrical connector plate along a second direction, and is stacked on one side surface of the electrical connector plate along a third direction. The overlapping area of ​​the folded portion 34 and the electrical connector plate forms the main body segment 31.

[0127] The folding part 34 is integrally folded from one side of the electrical connection plate along the second direction. In other words, the electrical connection plate and the folding part 34 are an integral structure and are integrally formed by folding.

[0128] As an example, the folded portion 34 is flattened and bent 180° from one side of the electrical connection plate along the second direction so that the folded portion 34 is stacked with the electrical connection plate.

[0129] The folding part 34 is compatible with existing process equipment, and there is no need to develop special molds or tooling. Existing CNC bending equipment can be directly reused to fold the electrical connection plate along one side of the second direction to form the folding part 34. The structure is stable after bending and no subsequent correction or heat treatment is required. In other words, the structure is simple, reliable and easy to form.

[0130] The folding portion 34 can be stacked on the surface of the electrical connection plate facing the battery cell 11 in a third direction. This avoids the first electrical connector 30 protruding from the surface facing away from the battery cell 11, facilitating insulation and minimizing the space occupied in the battery box 20. Alternatively, the folding portion 34 can also be stacked on the surface of the electrical connection plate facing away from the battery cell 11 in a third direction.

[0131] As an example, on a projection plane perpendicular to the third direction, the orthographic projection of the folded portion 34 and the orthographic projection of the battery cell assembly 10 do not overlap.

[0132] The overlapping area of ​​the electrical connection plate and the folded portion 34 forms the main body segment 31, and the other areas of the electrical connection plate besides the overlapping area with the folded portion 34 are the connecting segments 32. Of course, in some other embodiments, the other areas of the electrical connection plate besides the overlapping area with the folded portion 34 may also include the connecting segments 32 and the transition segments 33.

[0133] The structure is simple, easy to mold, and helps reduce production costs.

[0134] In some embodiments, the first electrical connector 30 includes an electrical connector plate and a separately disposed laminate, the laminate being stacked on one surface of the electrical connector plate along a third direction. The overlapping area of ​​the laminate and the electrical connector plate forms the main body segment 31 of the first electrical connector 30.

[0135] By stacking the laminations on one side of the electrical connection plate along a third direction, that is, the electrical connection plate and the laminations are separate structures.

[0136] The connection method between the lamination and the electrical connection plate is not limited here. As an example, the lamination and the electrical connection plate can be connected by welding, bonding, or stamping.

[0137] The laminations can be stacked on the third-party surface of the electrical connection plate facing the battery cell 11. This avoids the first electrical connector 30 protruding from the surface facing away from the battery cell 11, facilitating insulation and minimizing the space occupied in the battery box 20. Alternatively, the laminations can also be stacked on the third-party surface of the electrical connection plate facing away from the battery cell 11.

[0138] As an example, on a projection plane perpendicular to the third direction, the orthographic projection of the stacked cells and the orthographic projection of the battery cell assembly 10 do not overlap.

[0139] The overlapping area of ​​the electrical connection plate and the laminate forms the main body segment 31, and the other areas of the electrical connection plate besides the overlapping area with the laminate form the connecting segment 32. Of course, in some other embodiments, the other areas of the electrical connection plate besides the overlapping area with the laminate may also include the connecting segment 32 and the transition segment 33.

[0140] The structure is simple, easy to mold, and helps reduce production costs.

[0141] In some embodiments, the first electrical connector 30 includes an electrical connector plate that integrally protrudes at least a portion of one side surface along a third direction to form a body segment 31.

[0142] The protruding portion of the electrical connection plate can be the surface of the electrical connection plate facing the battery cell 11 in a third direction. This avoids the first electrical connector 30 protruding from the surface facing away from the battery cell 11, facilitating insulation and minimizing the space occupied in the battery box 20. Of course, the protruding portion of the electrical connection plate can also be the surface of the electrical connection plate facing away from the battery cell 11 in a third direction.

[0143] As an example, on a projection plane perpendicular to the third direction, the orthographic projection of the protruding portion of the electrical connection plate does not overlap with the orthographic projection of the battery cell assembly 10.

[0144] The protruding portion of the electrical connection plate forms the main body segment 31, and the other areas of the electrical connection plate excluding the protruding portion form the connecting segment 32. Of course, in other embodiments, the other areas of the electrical connection plate excluding the protruding portion may also include the connecting segment 32 and the transition segment 33.

[0145] The structure is simple, easy to mold, and helps reduce production costs.

[0146] In some embodiments, please refer to Figure 4 The first electrical connector 30 includes an electrical connector plate, a portion of which is thinned to form a connector segment 32, and the remaining portion of which forms a main body segment 31.

[0147] Of course, in other embodiments, the electrical connection plate may include connection segment 32 and transition segment 33 in areas other than the thinned area.

[0148] As an example, the electrical connection plate can be locally thinned to form a thinned area, which forms the connection segment 32.

[0149] In other words, taking the thickness of the electrical connection plate as h as an example, the thickness of the connection section 32 is less than h.

[0150] By thinning a portion of the electrical connection plate to form the connection segment 32, and leaving the unthinned portion to form the main body segment 31, the structure is simple, easy to form, and helps reduce production costs.

[0151] In some embodiments, please refer to Figure 6The first electrical connector 30 includes an electrical connector plate and a folded portion 34. The folded portion 34 is integrally folded from one side of the electrical connector plate along the second direction. The folded portion 34 is stacked on one side surface of the electrical connector plate along the third direction. The overlapping area of ​​the folded portion 34 and the electrical connector plate forms a main body segment 31. A portion of the electrical connector plate is thinned to form a connecting segment 32. Other areas of the electrical connector plate, excluding the main body segment 31 and the connecting segment 32, form a transition segment 33.

[0152] In some embodiments, the first electrical connector 30 includes an electrical connector plate and a folded portion 34. The folded portion 34 is integrally folded from one side of the electrical connector plate along a second direction. The folded portion 34 is stacked on one side surface of the electrical connector plate along a third direction, and the overlapping area of ​​the folded portion 34 and the electrical connector plate forms a main body segment 31. Other areas of the electrical connector plate, excluding the main body segment 31, are thinned to form a connecting segment 32.

[0153] In some embodiments, please refer to Figure 4 The dimension L1 of the connecting segment 32 in the third direction is 1mm-2mm.

[0154] The dimension of the connecting segment 32 in the third direction can be any one of 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, or 2mm, or any value between two of them.

[0155] In other words, the thickness of the connecting section 32 is 1mm-2mm. Thus, in the embodiment where the connecting section 32 is welded to the pole post 111, problems such as hot cracking and porosity caused by excessive thickness of the connecting section 32 can be avoided to a certain extent. That is to say, by setting the dimension of the connecting section 32 in the third direction to 1mm-2mm, the welding quality and welding reliability can be improved.

[0156] In some embodiments, please refer to Figure 4 The main body segment 31 has a dimension L3 of 3mm-30mm in the second direction.

[0157] The dimension of the main body segment 31 in the second direction can be any one of the following values ​​or any combination of two: 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 15mm, 16mm, 17mm, 18mm, 18.44mm, 18.5mm, 19mm, 20mm, 21mm, 22mm, 23mm, 25mm, 26mm, 28mm, and 30mm.

[0158] In an embodiment where the first electrical connector 30 includes an electrical connector plate and a folding portion 34, the dimension of the folding portion 34 in the second direction is the same as the dimension of the main body segment 31 in the second direction.

[0159] In an embodiment where the first electrical connector 30 includes an electrical connector plate and a lamination, the dimension of the lamination in the second direction is the same as the dimension of the main body segment 31 in the second direction.

[0160] In an embodiment where the first electrical connector 30 includes an electrical connector plate, and at least a portion of the electrical connector plate integrally protrudes from one side surface along a third direction to form a main body segment 31, the dimension of the protruding portion of the electrical connector plate in the second direction is the dimension of the main body segment 31 in the second direction.

[0161] It is understandable that the larger the size of the main body section 31 in the second direction, the larger the current-carrying cross-sectional area of ​​the first electrical connector 30 and the better the current-carrying capacity; the smaller the size of the main body section 31 in the second direction, the smaller the required assembly space.

[0162] By setting the size of the main body segment 31 in the second direction to 3mm-30mm, the current carrying capacity of the first electrical connector 30 and the required assembly space can be taken into account, and the impact of the first electrical connector 30 on other components (such as cooling plate, end plate, connecting bolts) can be minimized.

[0163] In some embodiments, please refer to Figure 4 The dimension L1 of the main body segment 31 in the third direction is 2.2mm-5.2mm.

[0164] The dimensions of the main body segment 31 in the third direction can be any one of the following values ​​or any combination of two values: 2.2mm, 2.3mm, 2.5mm, 2.6mm, 2.8mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 5mm, and 5.2mm.

[0165] In the embodiment where the first electrical connector 30 includes an electrical connector plate and a folding portion 34, the dimension of the main body segment 31 in the third direction is the sum of the dimensions of the electrical connector plate and the folding portion 34 in the third direction.

[0166] In the embodiment where the first electrical connector 30 includes an electrical connector plate and a lamination, the dimension of the main body segment 31 in the third direction is the sum of the dimensions of the electrical connector plate and the lamination in the third direction.

[0167] In an embodiment where the first electrical connector 30 includes an electrical connector plate, and at least a portion of the electrical connector plate integrally protrudes from one side surface in a third direction to form a main body segment 31, the dimension of the main body segment 31 in the third direction is the dimension of the protruding portion of the electrical connector plate in the third direction.

[0168] It is understandable that the larger the size of the main body section 31 in the third direction, the larger the current-carrying cross-sectional area of ​​the first electrical connector 30 and the better the current-carrying capacity. The smaller the size of the main body section 31 in the third direction, the smaller the required assembly space.

[0169] By setting the dimensions of the main body segment 31 in the third direction to 2.2mm-5.2mm, the current carrying capacity of the first electrical connector 30 and the required assembly space can be taken into account, and it is also convenient to insulate the first electrical connector 30.

[0170] In some embodiments, please refer to Figure 4 The difference in size between the main body section 31 and the connecting section 32 in the third direction is 0.2mm-4.2mm. In this way, the connection reliability, current carrying capacity and required assembly space of the first electrical connector 30 can be taken into account, and it is also convenient to insulate the first electrical connector 30.

[0171] In some embodiments, please refer to Figure 4 The battery device 100 also includes an isolation plate 40 located between the battery cell 11 and the first electrical connector 30. The isolation plate 40 is provided with a groove 41, and the main body section 31 is disposed in the groove 41.

[0172] As an example, the isolation plate 40 has an insulating function and can be used to install the first electrical connector 30 and the sampling harness, etc.

[0173] As an example, the partition 40 can be a thermoformed partition 40.

[0174] The isolation plate 40 sets the main body section 31 in the groove 41. In other words, the thickened main body section 31 can be covered by the isolation plate 40 without additional insulation treatment, thereby improving the current carrying capacity while taking into account cost and production efficiency.

[0175] As an example, the material of the insulating plate 40 can be polyvinyl chloride (PVC) or thermoplastic polyurethane (TPU). These materials have a certain degree of elastic deformation capability. Thus, the elastic deformation capability of the insulating plate 40 can be used to automatically fit the thickened main body segment 31. In other words, the insulation effect of the insulating plate 40 on the first electrical connector 30 can be improved, and the compatibility of the insulating plate 40 can be enhanced.

[0176] As an example, the increased thickness of the main body segment 31 can be matched with the elastic covering of the partition plate 40, that is, the increased thickness of the main body segment 31 can be controlled within the elastic deformation range of the partition plate 40.

[0177] As an example, the isolation plate 40 is fixed to the first electrical connector 30 by a thermo-pressed plastic rivet.

[0178] In some embodiments, please refer to Figure 4 The first electrical connector 30 includes an electrical connector plate that protrudes in at least a portion of a third-party surface facing the battery cell 11 to form the main body segment 31 of the first electrical connector 30.

[0179] The folded portion 34 can be formed by folding the electrical connection plate along one side of the second direction toward the battery cell 11, and the overlapping area of ​​the folded portion 34 and the electrical connection plate forms the main body segment 31. Alternatively, a lamination can be stacked on the surface of the electrical connection plate facing the battery cell 11 in the third direction, and the overlapping area of ​​the lamination and the electrical connection plate forms the main body segment 31. Or, at least a portion of the surface of the electrical connection plate facing the battery cell 11 in the third direction can be integrally protruded to form the main body segment 31 of the first electrical connector 30.

[0180] By protruding at least a portion of the electrical connection plate on the third-party surface facing the battery cell 11, insulation can be achieved by the separator 40, thus preventing the first electrical connection 30 from protruding on the surface opposite to the battery cell 11, facilitating insulation and minimizing the space occupied in the battery box 20.

[0181] In the description of this application, the references to terms such as "in one embodiment," "in some embodiments," "in other embodiments," "in yet another embodiment," or "exemplary," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine the different embodiments or examples described in this application, as well as the features of the different embodiments or examples.

[0182] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A battery device, characterized in that, The battery device includes: Battery box, the battery box having a receiving cavity; Multiple battery cell assemblies are disposed within the receiving cavity and arranged along a first direction, and at least one of the battery cell assemblies includes multiple battery cells arranged along a second direction. At least one first electrical connector, through which different battery cell assemblies are connected, and at least a portion of the first electrical connector is disposed on one side of the battery cell assembly along a third direction; At least one second electrical connector, wherein the battery cells within the same battery cell assembly are connected via the at least one second electrical connector; The first electrical connector includes a main body segment and a connecting segment connected to each other. The main body segment extends along the first direction and is at least partially located outside the battery cell assembly along the second direction. The connecting segment is provided at both ends of the main body segment along the first direction. The connecting segment is connected to different battery cell assemblies, and the dimension of the connecting segment in the third direction is smaller than the dimension of the main body segment in the third direction. The first direction, the second direction, and the third direction intersect each other.

2. The battery device according to claim 1, characterized in that, The first electrical connector includes an electrical connector plate and a folding portion. The folding portion is integrally folded from one side of the electrical connector plate along the second direction, and the folding portion is stacked on one side surface of the electrical connector plate along the third direction. The overlapping area of ​​the folding portion and the electrical connector plate forms the main body segment.

3. The battery device according to claim 1, characterized in that, The first electrical connector includes an electrical connector plate and a separately disposed laminate, the laminate being stacked on one side surface of the electrical connector plate along the third direction; the overlapping area of ​​the laminate and the electrical connector plate forms the main body segment.

4. The battery device according to claim 1, characterized in that, The first electrical connector includes an electrical connector plate, which integrally protrudes from at least a portion of one side surface along the third direction to form the main body segment.

5. The battery device according to claim 1, characterized in that, The first electrical connector includes an electrical connection plate, a portion of which is thinned to form the connection segment, and the remaining portion of which forms the main body segment.

6. The battery device according to claim 1, characterized in that, The main body segment has a dimension of 3mm-30mm in the second direction.

7. The battery device according to claim 1, characterized in that, The main body segment has a dimension of 2.2mm-5.2mm in the third direction; and / or, The difference in size between the main body segment and the connecting segment in the third direction is 0.2mm-4.2mm.

8. The battery device according to claim 1, characterized in that, The battery device further includes a separator plate located between the battery cell assembly and the first electrical connector, the separator plate having a groove, and the main body segment disposed within the groove.

9. The battery device according to claim 1, characterized in that, The first electrical connector includes an electrical connection plate that protrudes from at least a portion of the third-party surface facing the battery cell, forming the main body segment of the first electrical connector.

10. An electrical device, characterized in that, Includes the battery device according to any one of claims 1 to 9.

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