Battery device, energy storage device and system, and charging network

Abstract

The utility model provides a battery device, an energy storage device and system and a charging network, and belongs to the technical field of batteries. The battery device comprises a battery monomer, a first connecting piece, a second connecting piece and a monitoring module, the first connecting sheet is connected with the battery monomer; the second connecting piece comprises a first mounting part, a second mounting part and a connecting part, the connecting part is connected with the first mounting part and the second mounting part, and the first mounting part is connected with the first connecting piece; the monitoring module is connected with the second mounting part, and the thickness of the first mounting part is smaller than that of the connecting part. Through the connection mode that the first connection sheet is directly connected with the second connection sheet, a special output electrode base with relatively high cost in related technologies is omitted, the number of parts and processing procedures are reduced, meanwhile, the material cost and the assembly difficulty are reduced, and the cost performance of the battery device is improved. Meanwhile, the thickness of the first mounting part is small, the sum of the thicknesses of the two layers of plates is not too large, and the influence on other parts is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery device, an energy storage device and system, and a charging network. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of society. Rechargeable batteries have the characteristics of storing or releasing energy as needed, and are widely used in various electric devices or energy storage systems, and are an important part of promoting energy transformation and sustainable development. For the new energy industry, battery technology is an important factor for its development.

[0003] The battery device includes battery monomers and a monitoring module for detecting the state of the battery monomers. The battery monomers are connected by first connecting pieces, the first connecting pieces are connected to second connecting pieces, and the second connecting pieces are connected to the monitoring module to realize signal transmission between the monitoring module and the battery monomers.

[0004] In related technologies, the first connecting pieces and the second connecting pieces are connected through a base, which has a high cost and affects the cost of the battery device. Utility model content

[0005] The present application aims to at least solve one of the technical problems in the background art. To this end, one object of the present application is to provide a battery device, an energy storage device and system, and a charging network to reduce the cost of the battery device.

[0006] An embodiment of the first aspect of the present application provides a battery device, which includes: a battery monomer; a first connecting piece connected to the battery monomer; a second connecting piece including a first mounting portion, a second mounting portion, and a connecting portion, the connecting portion connecting the first mounting portion and the second mounting portion, the first mounting portion being connected to the first connecting piece; and a monitoring module connected to the second mounting portion, the thickness of the first mounting portion being less than the thickness of the connecting portion.

[0007] In the technical solution of the present application, the first connecting piece and the second connecting piece are directly connected by a connecting method, which eliminates the special output pole base with high cost in related technologies, reduces the number of parts and the processing procedures, and at the same time reduces the material cost and assembly difficulty, and improves the performance-price ratio of the battery device. At the same time, the thickness of the first mounting portion is relatively thin, and the sum of the thicknesses of the two layers of plates will not be too large, reducing the impact on other components. The connecting portion is designed to be relatively thick, which can provide sufficient mechanical support for the second connecting piece, enhance its anti-vibration and anti-impact capability, and adapt to complex use environments; and the thin structure of the first mounting portion can better adapt to the size of the connecting surface of the first connecting piece, reduce the space occupation of the connection area, and improve the compactness of the internal layout of the battery device.

[0008] In some embodiments, the first connecting piece is welded with the first mounting part; or the first connecting piece is bonded with the first mounting part; or the first connecting piece is clamped with the first mounting part. In this way, the direct connection of the first mounting part and the first connecting piece can be achieved, the output pole base is omitted, the overall structure design is simplified, the machining and assembly steps of the parts are reduced, the production and assembly difficulty is reduced, and the market competitiveness of the battery device is improved.

[0009] In some embodiments, the thickness of the first mounting part is greater than or equal to 1.0 mm and less than or equal to 1.3 mm. When the thickness of the first mounting part is ≥1.0 mm, sufficient cross-sectional area can be provided to meet the conduction requirements of the battery device under the rated working current, and the problems of serious heating and increased energy loss caused by excessive resistance due to small cross-sectional area can be avoided. When the thickness of the first mounting part is ≤1.3 mm, the overcurrent capacity can be ensured while avoiding material waste due to excessive thickness, and the welding difficulty is not significantly increased, balancing the requirements of electrical performance, economy and process, and ensuring stable current conduction and no overcurrent risk during the charging and discharging process of the battery device.

[0010] In some embodiments, the sum of the thickness of the first connecting piece and the thickness of the first mounting part is less than or equal to 1.5 mm. Controlling the sum of the thicknesses of the two to ≤1.5 mm can ensure that the welding energy can uniformly penetrate the two layers of plates, so that the bonding surface metal is fully melted and forms a dense weld, avoiding the problem of insufficient connection strength caused by insufficient heat. On the other hand, it can prevent the problem of excessive heat input caused by excessive total thickness, reduce the amount of welding deformation, ensure the flatness of the first connecting piece and the first mounting part, and avoid the increase of contact resistance or assembly interference caused by deformation.

[0011] In some embodiments, the width of the first mounting part is greater than the width of the connecting part. The overcurrent capacity of the welding area can be improved by expanding the cross-sectional area of the first mounting part without increasing the space occupied by the connecting part. On the one hand, a wider first mounting part can disperse the current density of the welding node, avoiding local overheating caused by concentrated current, and reducing the risk of material aging and insulation layer damage caused by high temperature. On the other hand, even if the thickness of the first mounting part is in the limited range of 1.0-1.3 mm, the wider width can still ensure that its overcurrent coefficient meets the rated working current requirement of the battery device, avoiding circuit protection triggering or energy loss problems caused by insufficient overcurrent capacity.

[0012] In some embodiments, the first connecting piece has a first through hole, the second connecting piece has a second through hole corresponding one-to-one to the first through hole, and the first through hole and the second through hole are in communication. Whether the first connecting piece and the second connecting piece are aligned can be determined by observing whether the first through hole and the second through hole are in communication before the first connecting piece and the second connecting piece are connected, avoiding positioning errors of the first connecting piece or the second connecting piece.

[0013] In some embodiments, the thickness of the first connecting sheet is greater than or equal to 0.2 mm and less than or equal to 0.5 mm. When the thickness of the first connecting sheet is set in the range of 0.2-0.5 mm, a reasonable match can be formed with the thickness of the first mounting portion, and the working range of the welding process is met.

[0014] In some embodiments, the material of the first connecting sheet and the material of the second connecting sheet are the same. The melting point and the thermal conductivity of the same material are consistent, and the heat conduction rate in the two layers of plates is uniform during welding, so that the welding temperature field can be more accurately controlled, and the local overheating melting or insufficient heat fusion caused by the difference in thermal conductivity can be avoided, thereby improving the welding quality.

[0015] In some embodiments, the material of the first connecting sheet and the material of the second connecting sheet are both aluminum. Aluminum has excellent electrical conductivity, and stable electrical conductivity can improve the accuracy of the voltage and current signals obtained by the monitoring module, avoid misjudgment of the battery state caused by signal deviation, provide reliable data support for charge and discharge control and fault warning, and ensure the power supply stability of the energy storage system.

[0016] In some embodiments, the battery device further comprises a wire harness isolation plate located between the battery monomer and the first connecting sheet, and the part of the second connecting sheet connected to the first connecting sheet is located on the side of the first connecting sheet away from the wire harness isolation plate. The wire harness isolation plate has a positioning pin, the first connecting sheet has a first positioning hole, the second connecting sheet has a second positioning hole, and the positioning pin penetrates the first positioning hole and the second positioning hole. The wire harness isolation plate serves as an insulating isolation layer, which can effectively block the electrical connection between the first connecting sheet and the electrode terminals of the battery monomer and the internal wire harness, and avoid short circuit caused by accidental contact between the first connecting sheet and the non-target area of the battery monomer. When the second connecting sheet is welded to the first connecting sheet, the connecting part of the second connecting sheet is located on the side of the first connecting sheet away from the isolation plate, which can avoid the metal splashes generated during welding from falling onto the wire harness or the battery monomer area below the isolation plate, thereby further improving the electrical safety protection level. The wire harness isolation plate provides support below the first connecting sheet, enhances the bending resistance of the first connecting sheet, avoids deformation caused by its own weight or vibration, ensures the long-term stability of the entire connecting structure, and prolongs the service life of the battery device.

[0017] In some embodiments, the positioning pin includes a first positioning pin and a second positioning pin, the first positioning pin is located in the first positioning hole, and the second positioning pin is located in the second positioning hole. The first positioning pin and the second positioning pin correspond to the first positioning hole and the second positioning hole respectively, forming independent positioning references, which can effectively avoid the precision interference problem caused by traditional single positioning pin considering multiple component positioning. The structure of the split positioning pin allows the first connecting sheet and the second connecting sheet to be assembled step by step, without the need to align the same set of positioning pins simultaneously, thereby improving the production efficiency.

[0018] In some embodiments, the second connecting plate has an avoiding notch for avoiding the first positioning pin. The avoiding notch, by means of local cutting, reserves a special accommodation space for the first positioning pin, solving the problem of physical interference between the second connecting plate and the first positioning pin. After assembly, the lower surface of the second connecting plate can be attached to the upper surface of the first connecting plate, especially the welding area of the first mounting part and the first connecting plate, without gap or protrusion obstruction, ensuring that the two layers of plates can be in close contact during welding, avoiding defects such as welding gap and virtual welding caused by poor adhesion, and significantly improving the sealing and conductive continuity of the welded joint.

[0019] Embodiments of the second aspect of the application provide an energy storage device, the energy storage device comprising a plurality of battery devices of any one of the above embodiments, the battery devices being configured to store or provide electrical energy.

[0020] Embodiments of the third aspect of the application provide an energy storage system, the energy storage system comprising a power conversion device and an energy storage device of the above embodiments, the power conversion device being configured to electrically connect a power generation device and the energy storage device.

[0021] Embodiments of the fourth aspect of the application provide a charging network, the charging network comprising a charging pile and an energy storage device of the above embodiments or an energy storage system of the above embodiments, the energy storage device or the energy storage system being configured to provide electrical energy for the charging pile.

[0022] The above description is only a summary of the technical solutions of the application. In order to enable the technical means of the application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the application to be more apparent and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0023] In the drawings, like reference numerals refer to same or similar components throughout the several views. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments in accordance with the disclosure and should not be considered limiting of the scope of the disclosure.

[0024] Figure 1 An exploded structural schematic diagram of a battery device provided by some embodiments of the application;

[0025] Figure 2 A structural schematic diagram of an energy storage system provided by some embodiments of the application;

[0026] Figure 3 A structural schematic diagram of a charging network provided by some embodiments of the application;

[0027] Figure 4 A structural schematic diagram of a battery device provided by some embodiments of the application;

[0028] Figure 5 Partial structure schematic diagram of battery device provided for some embodiments of the present application;

[0029] Figure 6 Top view of partial structure of battery device provided for some embodiments of the present application;

[0030] Figure 7 Structure schematic diagram of second connecting sheet provided for some embodiments of the present application;

[0031] Figure 8 Top view of second connecting sheet provided for some embodiments of the present application;

[0032] Figure 9 Left view of second connecting sheet provided for some embodiments of the present application;

[0033] Figure 10 Structure schematic diagram of first connecting sheet provided for some embodiments of the present application.

[0034] Explanation of reference signs:

[0035] 100, battery device; 10, box body; 11, first part; 12, second part; 20, battery cell; 30, first connecting sheet; 31, first positioning hole; 32, first through hole; 33, avoiding hole; 40, second connecting sheet; 41, first mounting part; 42, second mounting part; 43, connecting part; 44, second positioning hole; 45, avoiding notch; 46, second through hole; 50, monitoring module; 60, wire harness isolation plate; 61, positioning pin; 611, first positioning pin; 612, second positioning pin; 200, energy storage device; 300, power conversion equipment; 400, power generation equipment; 500, charging pile; 600, connector. DETAILED DESCRIPTION

[0036] The embodiments of the technical solutions of the present application will be described in detail below in combination with the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0037] 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 the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0038] In the description of the embodiments of the present application, the technical terms "first", "second", etc. 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. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise explicitly specified and limited.

[0039] Reference herein to "embodiments" means that the particular features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily a separate or alternative embodiment 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.

[0040] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0041] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0042] 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, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying 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 limiting the embodiments of the present application.

[0043] 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 understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanical connection, or it can be electrical connection; 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.

[0044] At present, from the development of market situation, the application of rechargeable batteries is more and more widely. Rechargeable batteries are not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in various electronic devices, such as electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of rechargeable batteries, the market demand is also increasing.

[0045] In various scenarios such as new energy vehicles and energy storage devices that require stable power supply, battery devices have become the core power source, and their performance stability and safety directly determine the use experience and reliability of the terminal product. The battery device usually includes a plurality of battery monomers and a monitoring module arranged in series or in parallel, and the monitoring module includes a battery monitoring circuit (Cell Supervision Circuit, CSC), which is used to monitor the state of the battery monomer in real time. Among them, the core function of the monitoring module is to accurately detect the voltage, current, temperature and other key state parameters of each battery monomer, and then provide data support for the charge and discharge management and fault warning of the battery device, and ensure the safe and efficient operation of the battery device.

[0046] In order to realize the signal transmission between the monitoring module and each battery monomer, a corresponding connection structure needs to be arranged in the battery device. Specifically, the plurality of battery monomers are electrically connected and signal-conducted through a first connecting piece, the first connecting piece is connected with a second connecting piece, and the end of the second connecting piece away from the first connecting piece is connected with a corresponding interface of the monitoring module, forming a complete signal transmission path to ensure that the monitoring module can obtain the state information of each battery monomer in real time.

[0047] In the structure design of the battery device in the related art, a special output pole base is usually used as a connection medium between the first connecting piece and the second connecting piece, and the two ends of the output pole are fixedly connected with the first connecting piece and the second connecting piece respectively to realize reliable conduction between them. However, the processing technology of such special output pole is complex, the cost is high, and the connection accuracy needs to be strictly controlled during assembly, which further increases the overall manufacturing cost of the battery device. With the rapid development of the new energy industry, the market puts forward higher requirements on the cost control of the battery device, and the above structure design relying on the output pole to realize the connection has become an important factor restricting the improvement of the performance-price ratio of the battery device, which is difficult to meet the needs of mass production and market competition.

[0048] Embodiments of the present application provide a battery device, which directly connects the first connecting piece and the second connecting piece through a connection mode, thereby eliminating the special output pole base with high cost in the related art, reducing the number of parts and processing procedures, and reducing the material cost and assembly difficulty, thereby improving the performance-price ratio of the battery device.

[0049] The battery device disclosed in the embodiments of the present application can be used in, but is not limited to, an electric device or an energy storage device for a vehicle, a ship or an aircraft. The power supply system of the electric device or the energy storage device can be composed of the battery device disclosed in the present application.

[0050] The embodiments of the present application also provide an energy storage device using the battery device as a power supply. The energy storage device can be, but is not limited to, an energy storage container, an energy storage cabinet, an energy storage power station, an energy storage battery device or a portable energy storage system.

[0051] The following embodiments are described by taking a battery device of an embodiment of the present application as an example for convenience of description.

[0052] Please refer to Figure 1 , Figure 1 The exploded structural schematic diagram of the battery device provided in some embodiments of the present application is shown. The battery device 100 includes a box body 10 and a battery cell 20, and the battery cell 20 is accommodated in the box body 10. The box body 10 is used to provide an accommodation space for the battery cell 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first part 11 and a second part 12, the first part 11 and the second part 12 are overlapped with each other, and the first part 11 and the second part 12 jointly define an accommodation space for accommodating the battery cell 20. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate-shaped structure, which is overlapped with the open side of the second part 12 to jointly define the accommodation space with the second part 12. The first part 11 and the second part 12 can also be hollow structures with one side open, and the open side of the first part 11 is overlapped with the open side of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0053] In the battery device 100, the battery cell 20 can be multiple, and the multiple battery cells 20 can be connected in series, in parallel or in a mixed manner. The mixed manner means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel or in a mixed manner, and then the whole of the multiple battery cells 20 is accommodated in the box body 10. Of course, the battery device 100 can also be that the multiple battery cells 20 are first connected in series, in parallel or in a mixed manner to form a battery module, and then the multiple battery modules are connected in series, in parallel or in a mixed manner to form a whole, which is accommodated in the box body 10. The battery device 100 can also include other structures, for example, the battery device 100 can also include a current collecting component for realizing the electrical connection between the multiple battery cells 20.

[0054] Each battery cell 20 can be a secondary battery or a primary battery, and can be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes.

[0055] Please refer to Figure 2 , Figure 2 A structural diagram of an energy storage system provided by some embodiments of the present application is shown. An energy storage device 200 provided by an embodiment of the present application includes one or more battery clusters to improve the voltage and capacity of the energy storage device 200. The battery cluster can include a plurality of battery devices 100 connected in series through busbars to improve the voltage of the energy storage device 200. When the energy storage device 200 includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to improve the capacity of the energy storage device 200. The energy storage device 200 can be used in an energy storage power station, a wind power system, a solar power system, a mobile power system, or a temporary power supply system, etc. The energy storage device 200 can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device 200 can store electrical energy during a low electricity consumption period and provide electrical energy to related users or electrical equipment during a high electricity consumption period. The energy storage system provided by an embodiment of the present application can be any power system that needs to use the energy storage device 200. In some embodiments, the energy storage device 200 is an energy storage container or an energy storage cabinet.

[0056] In some embodiments, the energy storage device 200 can include a cabinet and one or more battery clusters, and the battery clusters are accommodated in the cabinet.

[0057] In some embodiments, the energy storage device 200 can include a thermal management module, a master control module, a general control module, a power distribution module, and a fire-fighting module, etc.

[0058] As an example, the thermal management module can include a liquid cooling unit that provides cooling liquid for adjusting the temperature of the battery cell 20 to each battery device 100 through a pipeline.

[0059] As an example, the master control module can be a battery management unit of the battery cluster, used for monitoring and managing the battery cluster. The master control module can monitor information such as current, voltage, power, or temperature of the battery cluster. For example, the charging and discharging current and voltage of the battery cluster can be controlled. The master control module includes a slave battery management unit (SBMU), a fusion switch, and other modules.

[0060] As an example, the master control module can be used as a battery management unit of the energy storage device 200, for monitoring and managing the energy storage device 200. The master control module can monitor information such as current, voltage, power, state of charge, or temperature of the energy storage device 200. For example, the charging and discharging current, voltage, etc. of the energy storage device 200 can be controlled. As an example, the master control module includes an insulation monitoring module IMM (Insulation Monitoring Module, IMM), a master battery management unit MBMU (Master Battery Management Unit, MBMU), an Ethernet ETH (Ether Net, ETH), and an optical fiber conversion module, etc.

[0061] As an example, the fire-fighting system includes a control panel, a detector, an alarm device, etc., for detecting, alarming, or extinguishing the energy storage system.

[0062] As an example, the power distribution device can be used to distribute power to the power consumption module of the energy storage device 200.

[0063] In some embodiments, the energy storage system can include one or more energy storage devices 200 and a power conversion device 300 (Power Converter System, PCS) connected between the power generation device 400 and the energy storage device 200. The power generation device 400 is used to generate electric energy, and the electric energy generated by the power generation device 400 can be stored in the energy storage device 200 through the power conversion device 300, and the electric energy stored in the energy storage device 200 can be released to the power generation device 400 through the power conversion device 300. As an example, the power generation device 400 can be a power grid, a solar panel, a water power generation device 400, a fire power generation device 400, a wind power generation device 400, etc. The specific type of the power generation device 400 is not limited in the present application.

[0064] Please refer to Figure 3 , Figure 3 The structure of the charging network provided by some embodiments of the present application is shown in the figure. The charging network provided by the embodiments of the present application includes a charging pile 500 and an energy storage device 200, the charging pile 500 is electrically connected with the energy storage device 200, and the energy storage device 200 is used to provide electric energy for the charging pile 500. The charging pile 500 is electrically connected with the battery device 100 in the energy storage device 200 through a cable, and the battery device 100 can provide the electric energy stored by itself to the charging pile 500. The charging pile 500 has one or more connectors 600, which are used to connect with the power consumption equipment (such as a vehicle), so as to supply energy to the power consumption equipment.

[0065] The energy storage device 200 can be located inside the charging pile 500 (for example, a charging and storage integrated machine) or outside the charging pile 500.

[0066] The application provides a battery device, Figure 4 A structural schematic diagram of a battery device provided for another embodiment of the application is shown. Figure 5 A partial structural schematic diagram of a battery device provided for some embodiments of the application is shown. Figure 6 A top view of a partial structure of a battery device provided for some embodiments of the application is shown. Referring to Figure 4 to Figure 6 The battery device 100 further includes a first connecting sheet 30, a second connecting sheet 40 and a monitoring module 50. The first connecting sheet 30 is connected with the battery monomer 20, and the monitoring module 50 is connected with the second connecting sheet 40. The second connecting sheet 40 is connected with the first connecting sheet 30.

[0067] Figure 7 A structural schematic diagram of a second connecting sheet provided for some embodiments of the application is shown. Figure 8 A top view of a second connecting sheet provided for some embodiments of the application is shown. Referring to Figure 7 and Figure 8 The second connecting sheet 40 includes a first mounting portion 41, a second mounting portion 42 and a connecting portion 43. The connecting portion 43 connects the first mounting portion 41 and the second mounting portion 42. The first mounting portion 41 is connected with the first connecting sheet 30, and the second mounting portion 42 is connected with the monitoring module 50. Figure 9 A left view of a second connecting sheet provided for some embodiments of the application is shown. Referring to Figure 9 The thickness D1 of the first mounting portion 41 is less than the thickness D2 of the connecting portion 43.

[0068] The battery device 100 is a power supply component, and the internal structure design directly affects the power supply stability and signal transmission reliability. Specifically, the battery device 100 includes the battery monomer 20, the first connecting sheet 30, the second connecting sheet 40 and the monitoring module 50. The first connecting sheet 30, the second connecting sheet 40 and the monitoring module 50 are located in the above-mentioned box body 10. The components cooperatively constitute a complete power supply and monitoring system. The battery monomer 20 is the energy output core of the battery device 100, and can be set to a single or multiple series / parallel structure according to actual power supply requirements. The first connecting sheet 30 can be made of a metal material (such as copper, aluminum or an alloy thereof) with excellent electrical conductivity. One end of the first connecting sheet 30 is fixedly connected with the electrode terminal of the battery monomer 20 through compression or welding, so as to realize electrical connection and energy conduction among the multiple battery monomers 20 and lay a foundation for signal transmission.

[0069] Exemplarily, the maximum thickness of the first mounting portion 41 is less than the minimum thickness of the connecting portion 43.

[0070] The first mounting portion 41, the second mounting portion 42 and the connecting portion 43 are integrally formed, which can avoid the problem of poor contact in the assembly process.

[0071] In the structural design of the battery device 100, on the one hand, as a key conducting component connecting the first connecting sheet 30 and the monitoring module 50, the second connecting sheet 40 needs to bear the dual functions of mechanical support and signal / current conduction. Compared with the first connecting sheet 30 mainly responsible for the connection between the battery monomers 20, the second connecting sheet 40 usually needs to be thicker to ensure sufficient mechanical strength and avoid deformation or fracture caused by vibration and impact during transportation and use. On the other hand, due to the limitation of the existing space, the sum of the thicknesses of the two layers of the first connecting sheet 30 and the second connecting sheet 40 should not be too thick when they are connected, otherwise it will affect the layout of other components.

[0072] The connecting portion 43, as the main support structure of the second connecting sheet 40, bears the dual functions of mechanical bearing and conduction channel. Its length and bending angle can be flexibly designed according to the internal layout space of the battery device 100 to adapt to different installation scene requirements and realize the alignment of the first mounting portion 41 and the second mounting portion 42. The first mounting portion 41 is the connection adaptation end of the first connecting sheet 30, whose end surface is flat and the size matches the connection area of the first connecting sheet 30, ensuring the tightness of the connection between the two. The second mounting portion 42 is the connection end of the monitoring module 50, whose structure form is adapted to the interface design of the monitoring module 50. It can be reliably connected with the signal input interface of the monitoring module 50 through welding, plug-in or bolt fixation, etc., forming a stable signal transmission path.

[0073] In the embodiments of the present application, the first mounting portion 41 is connected with the first connecting sheet 30, that is, the second connecting sheet 40 is directly connected with the first connecting sheet 30. For example, the second connecting sheet 40 is welded with the first connecting sheet 30; or the second connecting sheet 40 is bonded with the first connecting sheet 30; or the second connecting sheet 40 is clamped with the first connecting sheet 30. It can be understood that the second connecting sheet 40 is directly connected with the first connecting sheet 30 without the need for connection through other components.

[0074] The second connecting sheet 40 is also made of a metal material with high electrical conductivity and low contact resistance. Its one end is fixedly connected with the end of the first connecting sheet 30 away from the battery monomer 20 by welding process, and the other end of the second connecting sheet 40 is connected with the signal input interface of the monitoring module 50. The connection mode can be adapted to the interface design of the monitoring module 50, and reliable connection forms such as welding and plug-in are adopted to form a complete signal transmission path from the battery monomer 20 to the monitoring module 50.

[0075] The monitoring module 50 serves as a state detection core and acquires key state parameters such as voltage, current and temperature of each battery monomer 20 in real time through the above connection structure, thereby providing accurate data support for charge-discharge control and fault diagnosis of the battery device 100 and ensuring safe and efficient operation of the battery device 100.

[0076] In the embodiments of the present application, the battery device 100 can include a plurality of first connecting pieces 30, and the plurality of first connecting pieces 30 can be electrically connected through FPC.

[0077] In the embodiments of the present application, the battery device 100 can include a plurality of second connecting pieces 40, and the plurality of second connecting pieces 40 can be connected with one monitoring module 50; or the battery device 100 can also include a plurality of monitoring modules 50, and the plurality of second connecting pieces 40 can be connected with the plurality of monitoring modules 50 one by one.

[0078] In the related art, the first connecting piece 30 and the second connecting piece 40 are connected with the output pole base through bolts, and the bolt connection process is complex, which affects the production efficiency of the battery device 100.

[0079] Through the connection mode of directly connecting the first connecting piece 30 and the second connecting piece 40, the special output pole base with high cost in the related art is omitted, the number of parts and the processing procedures are reduced, the material cost and the assembly difficulty are reduced, and the performance-price ratio of the battery device 100 is improved.

[0080] The thickness D1 of the first mounting portion 41 is relatively thin, and the sum of the thicknesses of the two layers of plates will not be too large, thereby reducing the influence on other components. The connecting portion 43 is designed to be relatively thick, which can provide sufficient mechanical support for the second connecting piece 40, enhance the vibration resistance and impact resistance of the second connecting piece 40, and adapt to complex use environments. The relatively thin structure of the first mounting portion 41 can better adapt to the size of the connecting surface of the first connecting piece 30, reduce the space occupation of the connection area, and improve the compactness of the internal layout of the battery device 100.

[0081] The relatively thick connecting portion 43 can reduce the resistance loss in the process of current conduction and signal transmission, reduce signal attenuation, and at the same time enhance the structural rigidity to avoid changes in contact resistance caused by deformation, so as to ensure that the monitoring module 50 can continuously acquire accurate state information of the battery monomer 20.

[0082] According to some embodiments of the present application, the first mounting portion 41 is welded with the first connecting piece 30; or the first mounting portion 41 is bonded with the first connecting piece 30; or the first mounting portion 41 is clamped with the first connecting piece 30.

[0083] In some embodiments of the present application, the welding method of the first mounting portion 41 and the first connecting sheet 30 can be selected from high-precision connection processes such as laser welding and resistance welding, to ensure the mechanical strength and stable conductivity of the connection between the two, and to avoid problems such as poor contact and excessive resistance.

[0084] In some embodiments of the present application, the first mounting portion 41 and the first connecting sheet 30 can be directly bonded and fixed by a high-strength conductive adhesive, to ensure that the first mounting portion 41 and the first connecting sheet 30 are closely fitted and conduct electricity smoothly.

[0085] In some embodiments of the present application, the first mounting portion 41 and the first connecting sheet 30 are designed as a matching clamping structure, for example, a buckle or a clamping groove is provided on the first connecting sheet 30, and a clamping protrusion or a clamping edge is provided on the first mounting portion 41, to achieve direct connection and fixation of the two by mechanical buckling, and to ensure the stability and reliable conductivity of the connected structure.

[0086] The above-mentioned method can realize the direct connection of the first mounting portion 41 and the first connecting sheet 30, eliminate the output pole base, simplify the overall structure design, reduce the processing and assembly steps of parts, and reduce the production and assembly difficulty, thereby helping to improve the market competitiveness of the battery device 100.

[0087] According to some embodiments of the present application, the first mounting portion 41 and the first connecting sheet 30 are welded. The welding connection method can ensure the tightness of the connection between the first connecting sheet 30 and the first mounting portion 41, reduce the contact resistance, and reduce the attenuation and interference in the signal transmission process, so that the monitoring module 50 can more accurately obtain the state information of the battery monomer 20, and provide reliable data protection for the management of the battery device 100. The welding structure of the first connecting sheet 30 and the first mounting portion 41 has high mechanical strength and strong anti-vibration and anti-impact capability, and can adapt to the complex use environment of terminal products such as new energy vehicles and energy storage equipment, prolong the service life of the battery device 100, and improve the overall operation stability. The first mounting portion 41 serves as the welding end, and the relatively thin thickness can reduce the heat input during welding, avoid performance degradation of the connection part due to high temperature, and facilitate rapid conduction and diffusion of welding heat, to ensure uniform formation of the welding joint and welding strength.

[0088] The first mounting portion 41 and the first connecting sheet 30 are welded, and the thickness D1 of the first mounting portion 41 is relatively thin, so that the matching degree of the thickness of the two layers is higher during welding, the heat conduction is uniform during welding, the welding seam is formed regularly, and the welding strength is significantly improved, effectively avoiding problems such as virtual welding and false welding caused by excessive difference in plate thickness. At the same time, heat accumulation during welding can be reduced, high temperature can be avoided to cause thermal damage to the first connecting sheet 30, the second connecting sheet 40 and the surrounding components, the probability of welding deformation can be reduced, the sealing property and conductivity of the welding joint can be ensured, and the connection reliability can be improved.

[0089] According to some embodiments of the present application, the thickness D1 of the first mounting portion 41 is greater than or equal to 1.0 millimeter (mm) and less than or equal to 1.3 millimeters.

[0090] Illustratively, the thickness D1 of the first mounting portion 41 is equal to 1.1 millimeters; or the thickness D1 of the first mounting portion 41 is equal to 1.2 millimeters.

[0091] The first mounting portion 41, as the connection core of the second connecting sheet 40 and the first connecting sheet 30, needs to bear the current conduction function, and its overcurrent capacity directly affects the electrical performance of the battery device 100. In the case that the width cannot be greatly widened due to the space limitation of the box body 10, the thickness is the key factor to guarantee the overcurrent capacity. When the thickness D1 of the first mounting portion 41 is greater than or equal to 1.0 mm, sufficient cross-sectional area can be provided to meet the conduction requirements of the battery device 100 under the rated working current, avoiding the problems of serious heating and increased energy loss due to excessive resistance. When the thickness D1 of the first mounting portion 41 is less than or equal to 1.3 mm, the overcurrent capacity can be guaranteed while avoiding material waste due to excessive thickness, and the welding difficulty will not be significantly increased, balancing the demand for electrical performance, economy and process, and ensuring stable current conduction of the battery device during charging and discharging without overcurrent risk.

[0092] The first mounting portion 41 not only needs to bear the current conduction task, but also needs to withstand external forces such as vibration and impact of the battery device during transportation, installation and use, so its structural strength is crucial. When the thickness D1 of the first mounting portion 41 is greater than or equal to 1.0 mm, sufficient mechanical rigidity can be provided to effectively resist deformation or fracture caused by external forces, avoiding the problem of stress concentration at the connection site due to excessive thinness, and fatigue damage after long-term use. When the thickness D1 of the first mounting portion 41 is less than or equal to 1.3 mm, the weight of the first mounting portion 41 will not increase due to excessive thickness, thereby increasing the overall load of the second connecting sheet 40, and the welding adaptability with the first connecting sheet 30 will not be affected, ensuring that the first mounting portion 41 has good strength while working stably with other components, adapting to complex use environments such as new energy vehicles and energy storage equipment.

[0093] The internal space of the box body 10 is compact, and the thickness D1 of the first mounting portion 41 will directly affect its space adaptability with the surrounding components. When the thickness D1 of the first mounting portion 41 is less than or equal to 1.3 mm, the space occupation in the thickness direction can be effectively controlled, avoiding interference with the surrounding components due to excessive thickness, and ensuring compact and reasonable layout of the components inside the box body 10. When the thickness D1 of the first mounting portion 41 is greater than or equal to 1.0 mm, the problem of easy bending during assembly due to excessive thinness can be avoided, the assembly compatibility of the first mounting portion 41 with the first connecting sheet 30 and the battery monomer 20 can be improved, and the assembly process of the entire battery device can be smooth and efficient.

[0094] According to some embodiments of the present application, the sum of the thickness of the first connecting piece 30 and the thickness D1 of the first mounting portion 41 is less than or equal to 1.5 mm.

[0095] Exemplarily, the sum of the thickness of the first connecting piece 30 and the thickness D1 of the first mounting portion 41 is equal to 1.5 mm; or the sum of the thickness of the first connecting piece 30 and the thickness D1 of the first mounting portion 41 is equal to 1.3 mm.

[0096] In the connection structure of the battery device, the welding quality of the first connecting piece 30 and the first mounting portion 41 directly determines the reliability of signal and current conduction, and the welding process has a clear technical limit for the total thickness of the two layers of to-be-welded plates. If the total thickness exceeds the process tolerance threshold, it will cause the welding heat to be unable to penetrate to the bonding surface of the two layers of plates, resulting in defects such as "unfused" and "false welding", or the local overheating and melting deformation of the plates due to heat accumulation, which damages the material conductivity and structural integrity.

[0097] Controlling the sum of the thicknesses of the two to be ≤1.5 mm, on the one hand, the total thickness can ensure that the welding energy (such as laser energy, resistance heat) can uniformly penetrate the two layers of plates, so that the bonding surface metal is fully melted and forms a dense weld, avoiding the problem of insufficient connection strength caused by insufficient heat; on the other hand, it can prevent the problem of excessive heat input caused by excessive total thickness, reduce the welding deformation, and ensure the flatness of the first connecting piece 30 and the first mounting portion 41, avoiding the increase of contact resistance or assembly interference caused by deformation.

[0098] Controlling the sum of the thicknesses of the two to be ≤1.5 mm does not need to rely on special customized welding equipment, and can directly adapt to the process parameters of the existing mass production line, reducing the cost of equipment modification and the difficulty of production debugging. The connection part of the first connecting piece 30 and the first mounting portion 41 is the key node of current and signal transmission, and the size of the contact resistance directly affects the energy loss and signal accuracy. If the sum of the thicknesses of the two exceeds 1.5 mm, even if the welding process is up to standard, it may cause the contact resistance to increase due to the following two points, one is that the thicker plate is easy to form an "interface oxide layer" during welding, and the interface metal is in contact with the air for a longer time during the cooling process after welding, which is easy to generate an oxide film, increasing the conductive resistance; two is that the welding pressure requirement of thick plates is higher, if the pressure is not properly controlled, it is easy to cause small gaps in the inside of the weld, forming "void resistance". Thinner total thickness makes the cooling speed after welding faster, reducing the opportunity of generating an interface oxide layer, ensuring the purity of the weld metal, and reducing the oxidation resistance; the pressure required for welding thin plates is smaller, and it is easier to control the uniformity of the welding pressure, reducing the internal gap of the weld, so that the current can be uniformly conducted along the weld, avoiding the risk of overheating caused by local current concentration. Reducing the energy loss in the charging and discharging process, and ensuring the accuracy of the voltage and current signals obtained by the monitoring module 50, avoiding the misjudgment of the battery state caused by signal distortion.

[0099] The inside space of the battery device box 10 is highly integrated, and needs to accommodate multiple components such as battery monomers 20, monitoring modules 50, wiring harnesses, heat dissipation components, etc. The size of the connection structure (especially in the thickness direction) directly affects the overall space utilization. If the sum of the thickness D1 of the first connecting piece 30 and the first mounting portion 41 exceeds 1.5 mm, it will cause the connection node to occupy more space in the thickness direction, thereby causing two problems. First, it may interfere with the battery monomer electrode above, the box 10 bottom plate below, or the adjacent connecting piece, limiting the installation position of other components. Second, to avoid interference, the overall size of the box 10 needs to be increased, which goes against the development trend of lightweight and miniaturization of new energy equipment. The design of a total thickness ≤1.5 mm can compress the thickness space of the connection node, leaving more installation space for other components. Under the same box 10 volume, the battery capacity is increased, or under the same battery capacity, the box 10 size is reduced, adapting to the application scenarios of new energy vehicles, energy storage cabinets, etc. which have strict space requirements.

[0100] According to some embodiments of the present application, referring to Figure 8 , the width L1 of the first mounting portion 41 is greater than the width L2 of the connecting portion 43.

[0101] Exemplarily, the maximum width of the first mounting portion 41 is greater than the maximum width of the connecting portion 43.

[0102] The pier-thin widening structure of the first mounting portion 41 can be realized by existing mature forging and stamping processes.

[0103] The first mounting portion 41, as the welding end of the second connecting piece 40 and the first connecting piece 30, is a key node for the current to pass from the first connecting piece 30 to the second connecting piece 40, and the overcurrent capacity directly determines the electrical performance reliability of the entire connection structure. As known from the foregoing, the thickness D1 of the first mounting portion 41 is limited by the welding process and cannot be increased indefinitely to improve the overcurrent capacity; while the connecting portion 43, as the main conduction section of the second connecting piece 40, its width is limited by the internal space of the electrical box and needs to be controlled within a certain range to avoid interference with other components. The second connecting piece 40 needs to meet the specific overcurrent coefficient requirement, and the overcurrent capacity is positively related to the cross-sectional area of the conductor. In the case of limited thickness, if only the overall width of the second connecting piece 40 is simply widened to increase the cross-sectional area to meet the overcurrent demand, it will be limited by the space layout inside the box 10 of the battery device 100. The space resources are tight, and the width of the second connecting piece 40 cannot be increased indefinitely, otherwise it will interfere with other components, affecting the overall assembly feasibility.

[0104] The width L1 of the first mounting portion 41 is designed to be greater than the width L2 of the connecting portion 43. In this way, the cross-sectional area of the first mounting portion 41 can be expanded to improve the flow capacity of the welding area without increasing the space occupied by the connecting portion 43. On the one hand, the wider first mounting portion 41 can disperse the current density of the welding node, thereby avoiding local overheating caused by current concentration and reducing the risk of material aging and insulation layer damage caused by high temperature. On the other hand, even if the thickness D1 of the first mounting portion 41 is in the limited range of 1.0-1.3 mm, the wider width can still ensure that the flow coefficient meets the rated working current demand of the battery device, thereby avoiding circuit protection triggering or energy loss caused by insufficient flow capacity.

[0105] The widened structure of the first mounting portion 41 increases the welding contact area, further enhances the mechanical stability and electrical continuity of the connection, reduces the contact resistance, and reduces the risk of heating. Without widening the overall width of the second connecting sheet 40, only the welding area is locally widened, which not only meets the flow requirement but also avoids space interference with other components in the box 10, improves the utilization rate of the internal space of the box 10, makes the overall structure layout more compact and reasonable, and ensures the smoothness and feasibility of the assembly process.

[0106] According to some embodiments of the present application, Figure 10 A structural diagram of the first connecting sheet is provided for some embodiments of the present application. Referring to Figure 10 , the first connecting sheet 30 has a first through hole 32, in combination Figure 5 to Figure 8 and Figure 10 , the second connecting sheet 40 has a second through hole 46 corresponding to the first through hole 32 one by one, and the first through hole 32 and the second through hole 46 are in communication.

[0107] In some embodiments of the present application, the first connecting sheet 30 has three first through holes 32, and the second connecting sheet 40 has three second through holes 46.

[0108] Before the first connecting sheet 30 and the second connecting sheet 40 are welded, whether the first connecting sheet 30 and the second connecting sheet 40 are aligned can be determined by observing whether the first through hole 32 and the second through hole 46 are in communication, thereby avoiding positioning errors of the first connecting sheet 30 or the second connecting sheet 40.

[0109] In an embodiment of the present application, the second through hole 46 is located in the first mounting portion 41. After the first connecting sheet 30 and the second connecting sheet 40 are welded, the welding condition can be observed through the first through hole 32 and the second through hole 46 to ensure that the welding quality is satisfactory.

[0110] According to some embodiments of the present application, the thickness of the first connecting sheet 30 is greater than or equal to 0.2 mm and less than or equal to 0.5 mm.

[0111] Exemplarily, the thickness of the first connecting sheet 30 is equal to 0.3 mm; or the thickness of the first connecting sheet 30 is equal to 0.4 mm.

[0112] It can be known in combination with the foregoing that the first connecting sheet 30 needs to be welded with the first mounting portion 41 of the second connecting sheet 40, and the sum of the thicknesses of the two needs to be ≤1.5 mm to meet the welding process requirements. When the thickness of the first connecting sheet 30 is set in the interval of 0.2-0.5 mm, a reasonable match can be formed with the thickness D1 (1.0-1.3 mm) of the first mounting portion 41, and the best interval of the welding process is met.

[0113] The thickness of the first connecting sheet 30 ≥0.2 mm can avoid the problems that heat is easy to break through the sheet during welding due to the sheet being too thin, or the weld strength is insufficient after welding, so as to ensure that the welded joint can withstand external force impact in the process of transportation and use of the battery device; and the thickness of the first connecting sheet 30 ≤0.5 mm can prevent the sum of the thicknesses of the two from being over-standard due to the sheet being too thick, avoid defects such as incomplete fusion of the weld and false welding, ensure the continuity of current and signal transmission, and reduce the contact resistance.

[0114] According to some embodiments of the present application, the material of the first connecting sheet 30 and the material of the second connecting sheet 40 are the same.

[0115] In the related art, in the traditional scheme, the first connecting sheet 30 (1 series aluminum) and the second connecting sheet 40 (6 series aluminum) have essential differences in physical and chemical properties due to different materials, and multiple technical problems are easy to be caused when directly welded. When the heterogeneous materials are welded, alloy elements such as magnesium and silicon in the 6 series aluminum are easy to diffuse into the 1 series aluminum, and form brittle intermetallic compounds, which causes the weld to be brittle.

[0116] The melting point and the thermal conductivity coefficient of the same material are consistent, the heat conduction rate in the two layers of sheet is uniform when welded, the welding temperature field can be more accurately controlled, the conditions of local overheating melting or insufficient heat not being fused due to the difference in thermal conductivity are avoided, and the welding quality is improved.

[0117] The thermal expansion coefficients of the same material are the same, the shrinkage and expansion amplitudes of the two layers of sheet are consistent in the welding cooling process or the temperature cycle of charging and discharging of the battery device, no internal stress is generated, the cracking and falling of the weld due to stress concentration are avoided, and the mechanical strength of the welded joint is improved.

[0118] The first connecting sheet 30 and the second connecting sheet 40 of the same material have no element diffusion risk when welded, the weld metal composition is consistent with the base material, good plasticity and toughness are maintained, and fracture failure under vibration and impact working conditions is avoided.

[0119] The first connecting sheet 30 and the second connecting sheet 40 are of the same material and have the same chemical activity, and have the same reaction characteristics with air and protective gas during welding, so that the gas generated by oxidation reaction is reduced, and the porosity of the weld is reduced; at the same time, the galvanic corrosion condition caused by the potential difference is avoided, and the connection failure caused by corrosion after long-term use of the heterogeneous joint is avoided, and the service life of the welded joint is prolonged.

[0120] The brittle compound or oxide layer formed by welding of heterogeneous materials increases the contact resistance, while the weld of homogeneous welding has no additional resistance loss, the resistance of the entire conductive path is reduced, the energy loss during charging and discharging is reduced, and the temperature rise of the battery device is reduced.

[0121] According to some embodiments of the present application, the material of the first connecting sheet 30 and the material of the second connecting sheet 40 are both aluminum.

[0122] Exemplarily, the material of the first connecting sheet 30 and the material of the second connecting sheet 40 are both 1-series aluminum.

[0123] Aluminum has excellent electrical conductivity, and stable electrical conductivity can improve the accuracy of the voltage and current signals obtained by the monitoring module 50, avoid misjudgment of the battery state caused by signal deviation, provide reliable data support for charging and discharging control and fault warning, and ensure the power supply stability of the energy storage system.

[0124] The energy storage system is often used in complex environments such as outdoors and high humidity, and the corrosion resistance of the connecting parts directly determines the long-term reliability of the system. Aluminum itself has excellent corrosion resistance, and a dense oxide film (Al2O3) can be easily formed on its surface, which can isolate air, moisture and other corrosive media.

[0125] According to some embodiments of the present application, referring to Figure 4 to Figure 6 , the battery device 100 further comprises a wire harness isolation plate 60, the wire harness isolation plate 60 is located between the battery monomer 20 and the first connecting sheet 30, and the part of the second connecting sheet 40 connected with the first connecting sheet 30 is located on the side of the first connecting sheet 30 away from the wire harness isolation plate 60, the wire harness isolation plate 60 has a positioning pin 61, in combination with Figure 5 to Figure 8 and Figure 10 , the first connecting sheet 30 has a first positioning hole 31, the second connecting sheet 40 has a second positioning hole 44, and the positioning pin 61 penetrates the first positioning hole 31 and the second positioning hole 44.

[0126] The wire harness isolation plate 60 as a whole can be made of a material with excellent insulation performance, high temperature resistance and certain mechanical strength, and is arranged horizontally above the electrode terminal of the battery monomer 20 and below the first connecting piece 30, i.e. between the battery monomer 20 and the first connecting piece 30, to form a physical isolation layer therebetween. This installation position can effectively separate the electrode area of the battery monomer 20 from the conductive area of the first connecting piece 30, while providing hidden arrangement space for the wire harness inside the electric box, avoiding direct contact between the wire harness and the conductive first connecting piece 30, and reducing the risk of short circuit.

[0127] In some embodiments of the present application, the wire harness isolation plate 60 can include an FPC, and the first connecting piece 30 is connected to the FPC.

[0128] The connecting part (i.e. the first mounting part 41) of the second connecting piece 40 to the first connecting piece 30 is located on the side of the first connecting piece 30 away from the wire harness isolation plate 60, and the lower surface of the first connecting piece 30 is attached to the upper surface of the wire harness isolation plate 60, and the upper surface is fixedly connected to the first mounting part 41 of the second connecting piece 40 by welding process.

[0129] The positioning pin 61 can be a cylindrical or prismatic structure, protruding upward from the upper surface of the wire harness isolation plate 60, and its outer diameter is precisely matched with the inner diameter of the first positioning hole 31 of the first connecting piece 30 and the second positioning hole 44 of the second connecting piece 40.

[0130] In an implementation manner of the present application, the wire harness isolation plate 60 has one positioning pin 61, and the positioning pin 61 penetrates the first positioning hole 31 and the second positioning hole 44. During assembly, the positioning pin 61 penetrates the first positioning hole 31 of the first connecting piece 30 and the second positioning hole 44 of the second connecting piece 40 from top to bottom, and the positioning of the wire harness isolation plate 60, the first connecting piece 30 and the second connecting piece 40 can be realized by the cooperation of "one pin and two holes", to ensure the alignment accuracy of the first connecting piece 30 and the electrode terminal of the battery monomer 20, and the alignment accuracy of the first mounting part 41 of the second connecting piece 40 and the welding area of the first connecting piece 30.

[0131] The wire harness isolation plate 60 serves as an insulating isolation layer, which can effectively block the electrical connection between the first connecting piece 30 and the electrode terminals of the battery monomer 20 and the internal wire harness, and avoid short circuit caused by accidental contact between the first connecting piece 30 and the non-target area of the battery monomer 20. When the second connecting piece 40 is welded with the first connecting piece 30, the connection part of the second connecting piece 40 is located on the side of the first connecting piece 30 away from the isolation plate, so that the metal splashes generated in the welding process can be prevented from falling into the wire harness or the battery monomer area below the isolation plate, and the electrical safety protection level is further improved. The wire harness isolation plate 60 provides support below the first connecting piece 30, enhances the bending resistance of the first connecting piece 30, avoids the sagging deformation of the first connecting piece 30 caused by its own weight or vibration, ensures the long-term stability of the entire connecting structure, and prolongs the service life of the battery device 100.

[0132] The cooperation structure of the positioning pin 61, the first positioning hole 31 and the second positioning hole 44 provides a unified positioning reference for the wire harness isolation plate 60, the first connecting piece 30 and the second connecting piece 40. In the automatic assembly process, the positions of the components do not need to be adjusted repeatedly by hand, and the alignment of the three can be quickly completed through the guiding action of the positioning pin 61, thereby improving the installation efficiency. During the bumping and vibration in the transportation process of the battery device 100, the three will not relatively deviate due to external force or deformation, thereby avoiding stress concentration of the welded joint caused by misalignment and reducing the risk of weld cracking.

[0133] In another implementation manner of the present application, the positioning pin 61 includes a first positioning pin 611 and a second positioning pin 612, the first positioning pin 611 is located in the first positioning hole 31, and the second positioning pin 612 is located in the second positioning hole 44.

[0134] In the embodiment of the present application, the first positioning pin 611 and the second positioning pin 612 can be made of an integrated injection molding process with the wire harness isolation plate 60. The first positioning pin 611 and the second positioning pin 612 can be differentiated and optimized in size and structural details according to the functional requirements of the corresponding positioning holes.

[0135] The outer diameter of the first positioning pin 611 and the inner diameter of the first positioning hole 31 form a clearance fit, the length of the first positioning pin 611 is slightly greater than the thickness of the first connecting piece 30, so that the first positioning pin 611 can completely penetrate the first positioning hole 31, and after assembly, the first connecting piece 30 can be stably radially constrained, thereby avoiding the horizontal deviation of the first connecting piece 30.

[0136] Exemplarily, the top end of the first positioning pin 611 can be provided with a circular arc chamfer, which can play a guiding role in the assembly process, facilitate the quick fitting of the first positioning hole 31, and reduce the assembly difficulty.

[0137] Similarly, the second positioning pin 612 is adapted to the second positioning hole 44 of the second connecting piece 40.

[0138] In the assembly sequence, the first positioning hole 31 of the first connecting sheet 30 is first aligned with the first positioning pin 611 to be sleeved, so that the first connecting sheet 30 is attached to the upper surface of the wire harness isolation plate 60; then the second positioning hole 44 of the second connecting sheet 40 is aligned with the second positioning pin 612 to be sleeved, so that the first mounting part 41 of the second connecting sheet 40 is attached to the upper surface of the first connecting sheet 30; finally, through the double positioning of the first positioning pin 611 and the second positioning pin 612, the accurate fixing of the three is realized, laying a foundation for the subsequent connecting process.

[0139] The first positioning pin 611 and the second positioning pin 612 correspond to the first positioning hole 31 and the second positioning hole 44 respectively, forming an independent positioning reference, which can effectively avoid the precision interference problem caused by the traditional single positioning pin considering multiple component positioning. The structure of the split positioning pin 61 allows the first connecting sheet 30 and the second connecting sheet 40 to be assembled step by step, without the need to align with the same set of positioning pins simultaneously, thereby improving production efficiency.

[0140] The traditional single positioning pin needs to bear the radial force of the first connecting sheet 30 and the second connecting sheet 40 at the same time, which is easy to cause the positioning pin to break or the positioning hole to deform due to stress concentration; and the split positioning pin disperses the force to the first positioning pin 611 and the second positioning pin 612, and each positioning pin only bears the force of the corresponding component, which can reduce the load of a single positioning pin.

[0141] Although the thickness and material of the first connecting sheet 30 and the second connecting sheet 40 are the same, there are differences in functional requirements, and the sizes and positions of the positioning holes may be slightly different due to component design. The split positioning pin can be individually designed according to the differences of the two, without compromising the positioning accuracy to adapt to multiple components, thereby enhancing the compatibility of the structure design. For example, if the size of the second connecting sheet 40 needs to be adjusted later, only the parameters of the second positioning pin 612 need to be correspondingly modified, without the need to change the first positioning pin 611, thereby reducing the design iteration cost and adapting to the multi-specification development needs of the battery device.

[0142] In the embodiments of the present application, since the first connecting sheet 30 is located between the wire harness isolation plate 60 and the second connecting sheet 40, the second positioning pin 612 needs to penetrate the first connecting sheet 30 and then penetrate the second positioning hole 44, and the first connecting sheet 30 can be provided with an avoiding hole 33, the avoiding hole 33 being in communication with the second positioning hole 44, the second positioning pin 612 penetrating the avoiding hole 33 and the second positioning hole 44 in sequence, and the second positioning pin 612 also positioning the first connecting sheet 30 through the avoiding hole 33.

[0143] According to some embodiments of the present application, referring to Figure 7 and Figure 8 , the second connecting sheet 40 has an avoiding notch 45 for avoiding the first positioning pin 611.

[0144] In the assembly structure of the battery device 100, the second connecting sheet 40 is located on the side of the first connecting sheet 30 away from the wire harness isolation plate 60, and after the first positioning pin 611 penetrates the first positioning hole 31 of the first connecting sheet 30, the top end of the first positioning pin 611 slightly protrudes above the upper surface of the first connecting sheet 30. If the second connecting sheet 40 adopts a complete flat plate structure, the lower surface of the second connecting sheet 40 will physically interfere with the top end of the first positioning pin 611, causing the second connecting sheet 40 to fail to closely fit the upper surface of the first connecting sheet 30, affecting the fit of the welding area, and possibly causing the second connecting sheet 40 to deform due to local stress.

[0145] The avoidance gap 45 is located in the edge area of the second connecting sheet 40 (close to the side of the first positioning pin 611), and its structural form is adapted to the cross-sectional shape of the first positioning pin 611. For example, if the first positioning pin 611 is cylindrical, the avoidance gap 45 is designed as a semicircle or U-shaped; if the first positioning pin 611 is prismatic, the avoidance gap 45 is correspondingly designed as a rectangle or polygon.

[0146] At the same time, the edge of the avoidance gap 45 can be treated with a circular arc transition, on the one hand to avoid sharp edges scratching the operator or other components during assembly, and on the other hand to reduce stress concentration and prevent the second connecting sheet 40 from cracking due to excessive stress at the gap. From the overall structure, the avoidance gap 45 is located away from the core functional area of the second connecting sheet 40, and only locally cut in the non-critical edge area, ensuring that the electrical conductivity and mechanical strength of the second connecting sheet 40 are not affected.

[0147] The avoidance gap 45 can provide a dedicated accommodation space for the first positioning pin 611 through local cutting, solving the physical interference problem between the second connecting sheet 40 and the first positioning pin 611. After assembly, the lower surface of the second connecting sheet 40 can fit the upper surface of the first connecting sheet 30, especially the welding area of the first mounting portion 41 and the first connecting sheet 30, without gaps or protrusions to ensure that the two layers of sheet materials can be in close contact during welding, avoiding defects such as welding gap, virtual welding, etc. caused by poor fit, significantly improving the sealing and electrical continuity of the welding joint.

[0148] During the automatic or manual assembly process, the avoidance gap 45 can play a dual role of visual positioning and physical guidance. The operator or automatic equipment can quickly determine the installation direction and position of the second connecting sheet 40 through the corresponding relationship between the avoidance gap 45 and the first positioning pin 611, reducing assembly errors caused by incorrect direction; at the same time, the opening design of the avoidance gap 45 allows the second connecting sheet 40 to avoid the first positioning pin 611 when it is sleeved into the second positioning pin 612, and then the position is adjusted to complete the cooperation between the second positioning hole 44 and the second positioning pin 612, improving the overall assembly efficiency.

[0149] Embodiments of the present application also provide an energy storage device, which comprises a plurality of the battery device in the above embodiments, and the battery device is used for storing or providing electric energy.

[0150] Embodiments of the present application also provide an energy storage system, which comprises a power conversion device and the energy storage device in the above embodiments, and the power conversion device is used for electrically connecting a power generation device and the energy storage device.

[0151] Embodiments of the present application also provide a charging network, which comprises a charging pile and the energy storage device in the above embodiments or the energy storage system in the above embodiments, and the energy storage device or the energy storage system is used for providing electric energy for the charging pile.

[0152] The battery device 100 comprises a box body 10, a battery cell 20, a first connecting sheet 30, a second connecting sheet 40 and a monitoring module 50, and the battery cell 20, the first connecting sheet 30, the second connecting sheet 40 and the monitoring module 50 are all located in the box body 10. The first connecting sheet 30 is connected with the battery cell 20, and the monitoring module 50 is connected with the second connecting sheet 40. Wherein, the second connecting sheet 40 is welded with the first connecting sheet 30.

[0153] The second connecting sheet 40 comprises a first mounting portion 41, a second mounting portion 42 and a connecting portion 43, the connecting portion 43 connects the first mounting portion 41 and the second mounting portion 42, the first mounting portion 41 is welded with the first connecting sheet 30, and the second mounting portion 42 is connected with the monitoring module 50, Figure 9 The left view of the second connecting sheet provided by some embodiments of the present application is shown in FIG. 4. Referring to FIG. 4, Figure 9 The thickness D1 of the first mounting portion 41 is less than the thickness D2 of the connecting portion 43. The thickness D1 of the first mounting portion 41 is greater than or equal to 1.0 millimeter and less than or equal to 1.3 millimeter. The sum of the thickness of the first connecting sheet 30 and the thickness D1 of the first mounting portion 41 is less than or equal to 1.5 millimeter. The thickness of the first connecting sheet 30 is greater than or equal to 0.2 millimeter and less than or equal to 0.5 millimeter. The width L1 of the first mounting portion 41 is greater than the width L2 of the connecting portion 43.

[0154] The first connecting sheet 30 has a first through hole 32, and the second connecting sheet 40 has a second through hole 46 corresponding to the first through hole 32 one by one, and the first through hole 32 and the second through hole 46 are communicated.

[0155] The material of the first connecting sheet 30 and the material of the second connecting sheet 40 are the same. The material of the first connecting sheet 30 and the material of the second connecting sheet 40 are both aluminum.

[0156] The battery device 100 further comprises a harness isolation plate 60, which is located between the battery cell 20 and the first connecting tab 30, and the part of the second connecting tab 40 connected with the first connecting tab 30 is located on the side of the first connecting tab 30 away from the harness isolation plate 60. The harness isolation plate 60 has a positioning pin 61, which penetrates the first positioning hole 31 and the second positioning hole 44 in combination with Figure 5 to Figure 8 and Figure 10 The first connecting tab 30 has a first positioning hole 31, and the second connecting tab 40 has a second positioning hole 44. The positioning pin 61 comprises a first positioning pin 611 and a second positioning pin 612, the first positioning pin 611 is located in the first positioning hole 31, and the second positioning pin 612 is located in the second positioning hole 44. The second connecting tab 40 has an avoiding notch 45 for avoiding the first positioning pin 611.

[0157] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, The battery device comprises: a battery cell; a first connecting plate connected with the battery cell; a second connecting plate comprising a first mounting portion, a second mounting portion and a connecting portion, the connecting portion connecting the first mounting portion and the second mounting portion, the first mounting portion being connected with the first connecting plate; a monitoring module connected with the second mounting portion, the thickness of the first mounting portion being less than the thickness of the connecting portion.

2. The battery device according to claim 1, characterized by The first connecting plate is welded with the first mounting portion; or the first connecting plate is adhered with the first mounting portion; or the first connecting plate is clamped with the first mounting portion.

3. The battery device according to claim 1 or 2, characterized by The thickness of the first mounting portion is greater than or equal to 1.0 millimeter and less than or equal to 1.3 millimeter.

4. The battery device according to claim 1 or 2, characterized by The sum of the thickness of the first connecting plate and the thickness of the first mounting portion is less than or equal to 1.5 millimeter.

5. The battery device according to claim 1 or 2, characterized by The width of the first mounting portion is greater than the width of the connecting portion.

6. The battery device according to claim 1 or 2, wherein The first connecting plate has a first through hole, and the second connecting plate has a second through hole corresponding to the first through hole, the first through hole and the second through hole being in communication.

7. The battery device according to claim 1 or 2, wherein The thickness of the first connecting plate is greater than or equal to 0.2 millimeter and less than or equal to 0.5 millimeter.

8. The battery device according to claim 1 or 2, characterized by The material of the first connecting plate is the same as the material of the second connecting plate.

9. The battery device of claim 8, wherein, The material of the first connecting plate and the material of the second connecting plate are both aluminum.

10. The battery device according to claim 1 or 2, characterized by The battery device further comprises: a wire harness isolation plate between the battery cell and the first connecting plate, the part of the second connecting plate connected with the first connecting plate being located on the side of the first connecting plate away from the wire harness isolation plate, the wire harness isolation plate having a positioning pin, the first connecting plate having a first positioning hole, and the second connecting plate having a second positioning hole, the positioning pin penetrating the first positioning hole and the second positioning hole.

11. The battery device of claim 10, wherein, The positioning pin comprises a first positioning pin and a second positioning pin, the first positioning pin being located in the first positioning hole, and the second positioning pin being located in the second positioning hole.

12. The battery device of claim 11, wherein, The second connecting plate has a avoiding gap for avoiding the first positioning pin.

13. An energy storage device, characterized by, The energy storage device comprises a plurality of battery devices according to any one of claims 1 to 12, the battery devices being used for storing or providing electric energy.

14. An energy storage system characterized by, The energy storage system comprises a power conversion device and an energy storage device according to claim 13, the power conversion device being used for electrically connecting a power generation device and the energy storage device.

15. A charging network characterized in that, The charging network comprises a charging pile and an energy storage device according to claim 13 or an energy storage system according to claim 14, the energy storage device or the energy storage system being used for providing electric energy for the charging pile.

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