Battery device, connecting structure and electric equipment

Abstract

The utility model provides a battery device, a connecting structure and electric equipment, the battery device comprises a flexible circuit board, a bus member and the connecting structure, the connecting structure is used for connecting the flexible circuit board and the bus member of the battery device, and the connecting structure comprises a body part and a lap joint part. The body part is used for collecting voltage signals and achieving the functions of voltage monitoring, circuit protection and the like. The body part comprises a connecting part and at least one through groove, the connecting part encloses to form the through groove, and the through groove is used for reserving a deformation space to release stress which is transmitted to the connecting part when the battery monomers are heated to expand, so that the possibility that a circuit of the flexible circuit board is snapped due to deformation of the connecting part is reduced. The lap joint parts are connected to the two sides of the body part in the first direction, and the lap joint parts are used for being electrically connected with the confluence piece or the flexible circuit board. According to the connecting structure provided by the embodiment of the invention, the through groove is formed in the body part for connecting the flexible circuit board and the convergence piece, so that the manufacturing process of the flexible circuit board can be simplified while the possibility of circuit breakage of the flexible circuit board is reduced, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power batteries, in particular to a battery device, a connecting structure and an electric equipment. BACKGROUND

[0002] In the battery device, the connection mode of the flexible printed circuit (FPC) and the busbar is usually that a connecting piece is pre-welded on the flexible printed circuit, and the other end of the connecting piece is welded on the busbar, and the FPC is connected with the battery monomer through the busbar. With the increase of use time and charge-discharge times, the battery monomer will swell and generate a large swelling force, and the swelling force of the battery monomer will cause the busbar and the FPC to stretch, thereby affecting the stability of the overall structure. CONTENT OF THE UTILITY MODEL

[0003] In view of the above problems, the present application provides a battery device, a connecting structure and an electric equipment, which can improve the stability of the connecting structure.

[0004] In the first aspect, the present application provides a battery device, comprising: a flexible printed circuit and a busbar, and a connecting structure connecting the flexible printed circuit and the busbar, the connecting structure comprising: a body part comprising a connecting part and at least one through slot, the connecting part enclosing the through slot; two lap parts respectively connected to both sides of the body part along a first direction, one of the lap parts being connected with the busbar, and the other lap part being connected with the flexible printed circuit.

[0005] In the technical scheme of the present application, the connecting structure is used to connect the flexible printed circuit and the busbar of the battery device, and the connecting structure comprises a body part and a lap part. The body part is used to collect voltage signals, and can realize functions such as voltage monitoring and protection circuit. The body part comprises a connecting part and at least one through slot, the connecting part enclosing the through slot, the through slot being used to reserve a deformation space to release the stress transmitted to the connecting part when the battery monomer swells due to heat, thereby reducing the possibility of the connecting part deforming to break the flexible printed circuit line. The lap part is connected to both sides of the body part along a first direction, and the lap part is used to be electrically connected with the busbar or the flexible printed circuit. By the connecting structure of the present application, the through slot is arranged on the body part connecting the flexible printed circuit and the busbar, the possibility of the flexible printed circuit line breaking is reduced, the manufacturing process of the flexible printed circuit is simplified, and the service life is improved while the cost is reduced.

[0006] In some embodiments, the through slot comprises a first sub-slot and a second sub-slot, the first sub-slot and the second sub-slot are in communication with each other, and the extension directions of the first sub-slot and the second sub-slot intersect.

[0007] In the scheme of the embodiment of the application, the first sub-groove and the second sub-groove are in communication with each other and the extension directions thereof intersect, which can reserve deformation spaces in different directions for the connecting part, disperse stress to more areas, reduce stress concentration in a single area, thereby improving the strength and durability of the connecting part and reducing the risk of deformation thereof.

[0008] In some embodiments, the body part has two side edges oppositely arranged along the second direction, the second sub-groove extends from the first sub-groove towards the side edge, and / or the extension direction of the first sub-groove is inclined relative to the first direction.

[0009] In the scheme of the embodiment of the application, the second sub-groove extends from the first sub-groove towards the side edge, and the inclined design of the first sub-groove makes the connecting part reserve deformation spaces in multiple directions for releasing stress when subjected to expansion forces in different directions, reduces concentrated stress in a single direction, and the multi-directional groove design can effectively improve the problem of warping or deformation of the connecting part.

[0010] In some embodiments, the two through grooves are arranged at intervals.

[0011] In the scheme of the embodiment of the application, the two through grooves are arranged at intervals, which can make the stress released by the connecting part more evenly, further reduce the problem of stress concentration in a single area, and improve the overall strength and stability of the structure.

[0012] In some embodiments, the first sub-grooves of the two through grooves are parallel to each other, and / or the second sub-grooves of the two through grooves are parallel to each other.

[0013] In the scheme of the embodiment of the application, the first sub-grooves of the two through grooves are arranged in parallel to each other, which can make the stress from the two sides of the two first sub-grooves be released more evenly, the second sub-grooves of the two through grooves are parallel to each other, which can make the stress from the two sides of the two first sub-grooves be released more evenly, and the overall strength and stability of the structure are improved.

[0014] In some embodiments, the body part includes two first sub-segments arranged at intervals along the first direction and a second sub-segment connected between the two first sub-segments, each first sub-segment is connected with each lap joint part; on the side of the second sub-groove away from the first sub-groove, the first sub-segment and the second sub-segment enclose a first opening, the first opening is in communication with the second sub-groove, or a buffer part is further connected between the first sub-segment and the second sub-segment, the connection strength of the buffer part with the first sub-segment and / or the second sub-segment is less than the connection strength of the first sub-segment and the second sub-segment on the side of the second sub-groove close to the first sub-groove.

[0015] In the scheme of the embodiment of the present application, on the side of the second sub-groove away from the first sub-groove, the first sub-section and the second sub-section enclose a first opening through which the first sub-groove and the second sub-groove are in communication with each other, so that the connecting part can reserve a deformation space for releasing the expansion force at the first opening when the connecting part is subjected to expansion forces in different directions, further reducing the problem of stress concentration in a single area, improving the overall strength and stability of the structure, and further reducing the problem of warping or deformation of the connecting part. Alternatively, a buffer part can be connected between the first sub-section and the second sub-section. The connection strength between the buffer part and the first sub-section and / or the second sub-section is less than the connection strength between the first sub-section and the second sub-section on the side of the second sub-groove close to the first sub-groove. When the connecting part is subjected to expansion forces in multiple directions, the stress can be released by disconnecting the buffer part from the first sub-section or the second sub-section, thereby improving the overall strength and stability of the structure. At the same time, the buffer part can provide a limit when the connecting part is not deformed by the expansion force, improving the risk of deformation and warping of the body part.

[0016] In some embodiments, a signal line is arranged in the body part, and a fuse part is arranged on the signal line and configured to be fused when the temperature reaches a threshold value.

[0017] In the scheme of the embodiment of the present application, the fuse part is used to fuse and cut off the signal line when the current is too large, which can limit the fault to the body part and reduce the risk of damage to the flexible circuit board due to overload, thereby prolonging the service life of the flexible circuit board.

[0018] In some embodiments, the body part includes a substrate layer, an adhesive layer, a circuit layer, and a protective layer stacked in sequence, and the lap joint part is arranged on the side of the substrate layer away from the adhesive layer and connected with the circuit layer.

[0019] In the scheme of the embodiment of the present application, the body part adopts the design of a substrate layer, an adhesive layer, a circuit layer, and a protective layer stacked in sequence. The substrate layer provides a solid foundation for the entire structure, increasing the overall rigidity and stability. The adhesive layer ensures firm connection between the layers, reducing the problem of delamination and peeling, and improving the stability and durability of the overall structure. The circuit layer is placed in the middle position, which can effectively isolate external interference and improve the reliability and stability of signal transmission. The protective layer covers the circuit layer, reducing the possibility of physical damage or chemical corrosion of the circuit layer, and further protecting the stability of the electrical performance.

[0020] In some embodiments, the substrate layer and the adhesive layer include a second opening arranged therethrough, at least part of the circuit layer is exposed through the second opening, one end of the lap joint part is used to connect with the bus member and the flexible circuit board, and the other end of the lap joint part is connected with the signal line through the second opening.

[0021] In the scheme of the embodiment of the present application, the signal line located in the circuit layer can be directly connected with the lapping part through the second opening, which simplifies the connection process. Direct lapping can reduce the number of welding points, thereby reducing the risk of poor welding and improving the reliability of the connection.

[0022] In some embodiments, the material of the lapping part includes copper.

[0023] In the scheme of the embodiment of the present application, the material of the lapping part includes copper, which is suitable for the busbar and the flexible circuit board and is easy to connect.

[0024] In the second aspect, the embodiment of the present application further provides a connection structure for connecting the flexible circuit board and the busbar of the battery device, and the connection structure comprises:

[0025] The body part comprises a connecting part and at least one through slot, and the connecting part encloses the through slot;

[0026] The two lapping parts are respectively connected to the two sides of the body part along the first direction, one of which is connected with the busbar, and the other is connected with the flexible circuit board.

[0027] In the third aspect, the embodiment of the present application further provides a power-using equipment comprising the battery device of any one of the above-mentioned first aspect.

[0028] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, which can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0029] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered as limiting the present application. Moreover, the same reference symbols are used to represent the same parts throughout the drawings. In the drawings:

[0030] Figure 1 is a schematic diagram of the exploded structure of the battery of some embodiments of the present application;

[0031] Figure 2 is a schematic diagram of the exploded structure of the battery cell of some embodiments of the present application;

[0032] Figure 3 is a schematic diagram of the structure of a battery connection structure connecting the flexible circuit board and the busbar according to an embodiment of the present application;

[0033] Figure 4is a local structure schematic view of a battery connection structure and a flexible circuit board and a busbar connection provided by an embodiment of the present application;

[0034] Figure 5 is a structure schematic view of a battery connection structure provided by an embodiment of the present application;

[0035] Figure 6 is a structure schematic view of a battery connection structure provided by an embodiment of the present application;

[0036] Figure 7 is a structure schematic view of a battery connection structure provided by an embodiment of the present application; Figure 5 is a sectional view of A-A in the above figure.

[0037] Explanation of reference signs:

[0038] 100 - battery;

[0039] 10 - box body, 11 - first part, 12 - second part;

[0040] 20 - battery cell, 21 - end cover, 21a - electrode terminal, 22 - shell, 23 - electrode assembly, 23a - tab;

[0041] 30 - connection structure, 31 - flexible circuit board, 32 - busbar;

[0042] 300 - body part, 311 - connection part, 312 - through slot, 312a - first sub-slot, 312b - second sub-slot, 313 - side edge, 314 - first sub-section, 315 - second sub-section, 316 - first opening, 317 - buffer part;

[0043] 320 - lapping part, 330 - fusing part, 331 - base material layer, 332 - adhesive layer, 333 - circuit layer, 333a - signal line, 334 - protective layer, 335 - second opening;

[0044] X - first direction; Y - second direction. DETAILED DESCRIPTION

[0045] The embodiments of the technical scheme of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0046] 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 be limiting of this application; the use of the terms "including," "comprising," "having" and "with" in the specification and claims herein are used to mean "including but not limited to"; the use of the terms "first," "second," "third," etc. are used to describe different objects and do not imply an order or a ranking of importance.

[0047] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the 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.

[0048] In the description of the embodiments of the present application, the technical terms "first", "second" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0049] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups).

[0050] 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 mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0051] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, a first feature is "on" or "under" a second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature can be "above", "over" and "on" the second feature, which can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature can be "below", "under" and "under" the second feature, which can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0052] At present, from the development of market situation, the application of power battery is more and more extensive. The power battery is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely applied to 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 power battery, the demand of its market is also increasing.

[0053] The inventor found in the research process that in the prior art, the current integrated busbar of the battery device is generally fixed on the top of the battery monomer of the battery device, which is used to collect the voltage, temperature and other information of the battery monomer, and connect the battery monomers in series and parallel to realize the electrical connection between the battery monomers. Flexible printed circuit (FPC) is usually used as a sampling harness. Among them, the flexible printed circuit is connected with the battery monomer through the busbar. With the increase of use time and charge-discharge times, the battery monomer will swell and generate a large swelling force. The swelling force of the battery monomer will cause the busbar and the flexible printed circuit to stretch, thereby affecting the stability of the overall structure.

[0054] In addition, the conductive layer of the flexible printed circuit is usually copper-based. The aluminum bar in the battery device is different in material from the copper-based. In order to realize the direct welding of the aluminum bar and the copper-based, ultrasonic welding method needs to be used. The ultrasonic welding has high requirements for the welding points, resulting in low welding yield and welding efficiency. Although there are many schemes to connect through nickel sheets, the nickel sheet is a key structural part for connecting the battery monomer and the flexible printed circuit, and plays a role in voltage collection. However, the traditional nickel sheet often needs a large solder pad, which limits the circuit design size of the flexible printed circuit and reduces the available cross-sectional area. The welding process between the nickel sheet and the flexible printed circuit involves the reflow soldering process of the flexible printed circuit, which requires high production process and high production cost. Moreover, the battery monomer will swell during charging and discharging. The traditional long nickel sheet has no space to deform and is easy to deform.

[0055] Based on the above problems, the application provides a connecting structure, which includes a body part and a lap joint part. The connecting structure is used as a connecting piece between a busbar and a flexible circuit board. The connecting structure includes a body part and a lap joint part. The body part includes a connecting part and a through slot. The connecting part encloses the through slot. A stretching allowance is formed between the body parts by arranging the through slot. The risk of the body part being deformed and damaged and the flexible circuit board line being pulled off due to the expansion of the battery monomer caused by charging and discharging is improved. The service life of the flexible circuit board is improved without arranging a deformation space in the body of the flexible circuit board. The structure of the flexible circuit board is simplified.

[0056] Please refer to Figure 1 , Figure 1 An exploded view of a battery 100 is provided for some embodiments of the application. The battery 100 includes a box body 10 and a battery monomer 20, and the battery monomer 20 is contained in the box body 10. The box body 10 is used to provide a containing space for the battery monomer 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, and 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 a containing space for containing the battery monomer 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, and the first part 11 is overlapped with the open side of the second part 12 to jointly define the containing 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.

[0057] In the battery 100, the battery monomer 20 can be multiple, and the multiple battery monomers 20 can be connected in series, in parallel or in a mixed manner. The mixed manner means that there are both series connection and parallel connection among the multiple battery monomers 20. The multiple battery monomers 20 can be directly connected in series, in parallel or in a mixed manner, and then the whole of the multiple battery monomers 20 is contained in the box body 10; of course, the battery 100 can also be that the multiple battery monomers 20 are first connected in series, in parallel or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, in parallel or in a mixed manner to form a whole, and the whole is contained in the box body 10. The battery 100 can also include other structures, for example, the battery 100 can also include a busbar component for realizing electrical connection between the multiple battery monomers 20.

[0058] Each battery monomer 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery monomer 20 can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc.

[0059] Please refer to Figure 2 , Figure 2 The exploded structural diagram of a battery cell 20 is provided for some embodiments of the present application. The battery cell 20 refers to the smallest unit that constitutes a battery. As shown in Figure 2 , the battery cell 20 includes an end cover 21, a shell 22, an electrode assembly 23, and other functional components.

[0060] The end cover 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cover 21 can be adapted to the shape of the shell 22 to fit the shell 22. Alternatively, the end cover 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 21 is not easily deformed when subjected to extrusion and impact, allowing the battery cell 20 to have higher structural strength and improved safety performance. The end cover 21 can be provided with functional components such as an electrode terminal 21a. The electrode terminal 21a can be used to electrically connect with the electrode assembly 23 for outputting or inputting the electrical energy of the battery cell 20. In some embodiments, the end cover 21 can also be provided with a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value. The material of the end cover 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not specially limited in the embodiments of the present application. In some embodiments, an insulating member can also be provided on the inner side of the end cover 21, which can be used to isolate the electrical connection components in the shell 22 from the end cover 21 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0061] The shell 22 is a component used to fit the end cover 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, the electrolyte, and other components. The shell 22 and the end cover 21 can be independent components, and an opening can be provided on the shell 22, and the end cover 21 is made to cover the opening to form the internal environment of the battery cell 20. Without limitation, the end cover 21 and the shell 22 can also be integrated, specifically, the end cover 21 and the shell 22 can form a common connecting surface before other components enter the shell, and when it is necessary to seal the inside of the shell 22, the end cover 21 is made to cover the shell 22. The shell 22 can be various shapes and sizes, such as cuboid, cylinder, hexagonal prism, etc. Specifically, the shape of the shell 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the shell 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not specially limited in the embodiments of the present application.

[0062] Electrode assembly 23 is the component in the battery cell 20 where electrochemical reactions occur. The casing 22 may contain one or more electrode assemblies 23. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 23, while the portions of the positive and negative electrode sheets without active material each constitute a tab 23a. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs 23a connect to the electrode terminals to form a current loop.

[0063] Please see Figure 1 , Figures 3 to 5 According to an embodiment of the first aspect of this application, a battery device is provided, including a flexible circuit board 31 and a busbar 32, and a connection structure 30 connecting the flexible circuit board 31 and the busbar 32. The connection structure 30 includes a body portion 300 and two overlapping portions 320. The body portion 300 includes a connecting portion 311 and at least one through groove 312. The connecting portion 311 surrounds to form the through groove 312. The two overlapping portions 320 are respectively connected to both sides of the body portion 300 along a first direction X. One overlapping portion 320 is connected to the busbar 32, and the other overlapping portion 320 is connected to the flexible circuit board 31.

[0064] In this application embodiment, a battery device is provided, including a flexible circuit board 31 and a busbar 32, and a connection structure 30 connecting the flexible circuit board 31 and the busbar 32. The connection structure 30 includes a body portion 300 and an overlapping portion 320. The body portion 300 is used to collect voltage signals and can realize functions such as voltage monitoring and protection circuits. The body portion 300 includes a connecting portion 311 and at least one through groove 312. The connecting portion 311 surrounds to form the through groove 312, which is used to reserve deformation space to release the stress transmitted to the connecting portion 311 when the battery cell 20 is heated and expanded, thereby reducing the possibility of deformation of the connecting portion 311 causing the circuit of the flexible circuit board 31 to break. The overlapping portion 320 is connected to both sides of the body portion 300 along the first direction X, and the overlapping portion 320 is used for electrical connection with the busbar 32 or the flexible circuit board 31. By using the connection structure 30 of this application embodiment, the through groove 312 is provided on the body part 300 that connects the flexible circuit board 31 and the busbar 32, which reduces the possibility of circuit breakage of the flexible circuit board 31, simplifies the manufacturing process of the flexible circuit board 31, reduces costs and increases service life.

[0065] Optional, such as Figure 1 and Figure 3As shown, one flexible circuit board 31 can be electrically connected with multiple busbars 32 through multiple connecting structures 30, so as to connect the flexible circuit board 31 with the battery monomer 20.

[0066] Optionally, the connecting structure 30 can be a voltage sampling terminal, which is used for collecting voltage signals and can realize functions such as voltage monitoring and protection circuit.

[0067] Optionally, the busbar 32 can be an aluminum bar, which is used for realizing series or parallel connection between the battery monomers 20.

[0068] Optionally, the flexible circuit board 31 is connected with the busbar 32 through the connecting structure 30, so as to realize collection of voltage signals and other information.

[0069] Optionally, the flexible circuit board 31 includes a PI substrate and a solder pad on one side of the substrate, and the PI substrate includes polyimide (PI). Optionally, the material of the solder pad includes copper, and the connecting structure 30 is overlapped with the solder pad through an overlapping portion 320.

[0070] Optionally, the overlapping portion 320 can include a solder pad, which is used for overlapping with the busbar 32 and the solder pad of the flexible circuit board 31, and the welding manner is simpler.

[0071] In some embodiments, the through slot 312 includes a first sub-slot 312a and a second sub-slot 312b, the first sub-slot 312a and the second sub-slot 312b are in communication with each other, and the extension directions of the first sub-slot 312a and the second sub-slot 312b are intersected.

[0072] In these embodiments, the first sub-slot 312a and the second sub-slot 312b are in communication with each other and the extension directions thereof are intersected, which can reserve deformation spaces in different directions for the connecting portion 311, disperse stress to more areas, reduce stress concentration in a single area, thereby improving the strength and durability of the connecting portion 311 and reducing the risk of deformation thereof. In some embodiments, the body portion 300 has two side edges 313 oppositely arranged along the second direction Y, the second sub-slot 312b extends from the first sub-slot 312a towards the side edge 313, and / or the extension direction of the first sub-slot 312a is inclined relative to the first direction X.

[0073] In these embodiments, the second sub-slot 312b extends from the first sub-slot 312a towards the side edge 313, and the inclined design of the first sub-slot 312a makes the connecting portion 311 be able to reserve deformation spaces for releasing stress in multiple directions when subjected to expansion forces in different directions, so as to reduce concentrated stress in a single direction. The multi-directional slot design can effectively improve the problem of warping or deformation of the connecting portion 311.

[0074] Optionally, the included angle formed by the extension direction of the first sub-slot 312a and the extension direction of the second sub-slot 312b can be an acute angle, a right angle, or an obtuse angle. Optionally, the included angle formed by the extension direction of the first sub-slot 312a and the extension direction of the second sub-slot 312b can be an obtuse angle, which facilitates the preparation of the first sub-slot 312a and the second sub-slot 312b, and when the included angle is an obtuse angle, the body part 300 is more easily stretched to deform under the action of the expansion force, thereby releasing stress.

[0075] In some embodiments, the through slot 312 is two, and the two through slots 312 are arranged at intervals.

[0076] In these embodiments, the two through slots 312 are arranged at intervals, which can make the stress released by the connecting part 311 more evenly, further reduce the problem of stress concentration in a single area, and improve the overall strength and stability of the structure.

[0077] In some embodiments, the first sub-slot 312a of the two through slots 312 is parallel to each other, and / or the second sub-slot 312b of the two through slots 312 is parallel to each other.

[0078] In these embodiments, the first sub-slot 312a of the two through slots 312 is arranged in parallel, which can more evenly release the stress from both sides of the two first sub-slots 312a, and the second sub-slot 312b of the two through slots 312 is parallel to each other, which can more evenly release the stress from both sides of the two first sub-slots 312a, thereby improving the overall strength and stability of the structure.

[0079] Optionally, the second sub-slot 312b of the two through slots 312 is parallel to each other and at least partially overlaps in the first direction X, wherein one first sub-slot 312a extends towards the direction close to the other second sub-slot 312b, so that the distance between the two through slots 312 is closer, thereby saving arrangement space.

[0080] In some embodiments, as shown in Figure 5 and Figure 6 The body part 300 includes two first sub-sections 314 arranged at intervals in the first direction X and a second sub-section 315 connected between the two first sub-sections 314, and each first sub-section 314 is connected to each lap joint 320. As shown in Figure 6 On the side of the second sub-slot 312b away from the first sub-slot 312a, the first sub-section 314 and the second sub-section 315 form a first opening 316, and the first opening 316 is in communication with the second sub-slot 312b.

[0081] In these embodiments, on the side of the second sub-groove 312b away from the first sub-groove 312a, the first sub-section 314 and the second sub-section 315 can enclose a first opening 316 in communication with the second sub-groove 312b, so that the connecting portion 311 can reserve a deformation space for releasing the expansion force at the first opening 316 when subjected to expansion forces in different directions, further reducing the problem of stress concentration in a single area, improving the overall strength and stability of the structure, and further reducing the problem of warping or deformation of the connecting portion 311.

[0082] Alternatively, in other optional embodiments, as shown in Figure 5 The first sub-section 314 and the second sub-section 315 are further connected with a buffer portion 317, and the connection strength of the buffer portion 317 with the first sub-section 314 and / or the second sub-section 315 is less than the connection strength of the first sub-section 314 and the second sub-section 315 on the side of the second sub-groove 312b close to the first sub-groove 312a.

[0083] In these embodiments, the first sub-section 314 and the second sub-section 315 can be further connected with a buffer portion 317, and the connection strength of the buffer portion 317 with the first sub-section 314 and / or the second sub-section 315 is less than the connection strength of the first sub-section 314 and the second sub-section 315 on the side of the second sub-groove 312b close to the first sub-groove 312a. When the connecting portion 311 is subjected to expansion forces in multiple directions, the stress can be released by disconnecting the buffer portion 317 from the first sub-section 314 or the second sub-section 315, thereby improving the overall strength and stability of the structure. At the same time, the buffer portion 317 can provide a limit when the connecting portion 311 is not deformed by the expansion force, thereby improving the risk of deformation and warping of the body portion 300.

[0084] Optionally, the second sub-section 315 can extend along a bending path, for example, the second sub-section 315 extends along an S-shaped path to enclose two through grooves 312 with two first sub-sections 314, respectively. For example, one of the first sub-sections 314 and the second sub-section 315 enclose one of the through grooves 312, and the other first sub-section 314 and the second sub-section 315 enclose the other through groove 312. The two through grooves 312 between the two first sub-sections 314 can make the stress released by the connecting portion 311 more evenly, further reducing the problem of stress concentration in a single area, improving the overall strength and stability of the structure.

[0085] In some embodiments, as shown in Figures 1 to 7 The body portion 300 is provided with a signal line 333a, and the signal line 333a is provided with a fuse portion 330 configured to be able to fuse when the temperature reaches a threshold value.

[0086] In these embodiments, the fusing portion 330 is configured to be able to fuse when the temperature reaches a threshold value, for example, when the current is too large, the fusing portion 330 fuses to cut off the communication of the signal line 333a, which can limit the fault to the body portion 300, reduce the risk of damage to the flexible circuit board 31 due to overload, thereby prolonging the service life of the flexible circuit board 31.

[0087] Optionally, the fusing portion 330 can be formed on the signal line 333a by etching.

[0088] Optionally, the fusing portion 330 can be formed by locally reducing the cross-sectional area of the signal line 333a, etc., which is simple in manufacturing process.

[0089] In some embodiments, as shown in Figure 7 The body portion 300 includes a substrate layer 331, an adhesive layer 332, a circuit layer 333, and a protective layer 334 stacked in sequence, and the lap joint portion 320 is arranged on the side of the substrate layer 331 away from the adhesive layer 332 and connected with the circuit layer 333.

[0090] In these embodiments, the body portion 300 adopts the design of the substrate layer 331, the adhesive layer 332, the circuit layer 333, and the protective layer 334 stacked in sequence, the substrate layer 331 provides a solid foundation for the entire structure, increasing the rigidity and stability of the whole. The adhesive layer 332 ensures firm connection between the layers, reduces the problem of delamination and peeling of each layer, and improves the stability and durability of the overall structure. The circuit layer 333 is placed in the middle position, which can effectively isolate external interference and improve the reliability and stability of signal transmission. The protective layer 334 covers the circuit layer 333, reducing the possibility of physical damage or chemical corrosion of the circuit layer 333, and further protecting the stability of the electrical performance. The lap joint portion 320 is arranged on the side of the substrate layer 331 away from the adhesive layer 332 and connected with the circuit layer 333, which is simple and reliable in connection mode.

[0091] Optionally, the substrate layer 331 can include a PI substrate. Optionally, the adhesive layer 332 can include an adhesive. Optionally, the circuit layer 333 can include copper. Optionally, the protective layer 334 includes a first sub-layer and a second sub-layer arranged in sequence on the side away from the circuit layer 333, the first sub-layer can include an adhesive, and the second sub-layer can include polyimide, and the second sub-layer can be adhered to the circuit layer 333 through the first sub-layer. The above-mentioned materials are inexpensive, easy to manufacture, and cost-effective.

[0092] Optionally, the thickness of the substrate layer 331 can be 20-30 μm, and the thickness of the substrate layer 331 can be 20 μm, 22 μm, 25 μm, 27 μm, or 30 μm, which can improve the problem of excessive mass caused by excessive thickness of the substrate layer 331, and can also improve the problem of insufficient support and easy breakage caused by excessive thinness of the substrate layer 331.

[0093] Optionally, the thickness of the circuit layer 333 can be 30-40 μm, and the thickness of the circuit layer 333 can be 30 μm, 32 μm, 35 μm, 37 μm or 40 μm. This can improve the problem of excessive resistance caused by the increase of the thickness of the body part 300, and can also improve the problem of easy breakage of the signal line caused by the excessive thinness of the circuit layer 333.

[0094] Optionally, the thickness of the first sub-layer can be 30-40 μm, and the thickness of the first sub-layer can be 30 μm, 32 μm, 35 μm, 37 μm or 40 μm. This can improve the problem of easy warping of the second sub-layer caused by the excessive thickness of the first sub-layer, and can also improve the problem of easy breakage of the signal line caused by the excessive thinness of the first sub-layer.

[0095] Optionally, the thickness of the second sub-layer can be 20-30 μm, and the thickness of the second sub-layer can be 20 μm, 22 μm, 25 μm, 27 μm or 30 μm. This can improve the problem of excessive quality of the body part 300 caused by the excessive thickness of the second sub-layer, and can also improve the problem of easy breakage of the signal line caused by the insufficient protection of the circuit layer 333 caused by the excessive thinness of the second sub-layer.

[0096] In some embodiments, as shown in FIGS. 1A and 1B, the substrate layer 331 and the adhesive layer 332 comprise a second opening 335 arranged through the substrate layer 331 and the adhesive layer 332, and at least part of the circuit layer 333 is exposed by the second opening 335. One end of the lap joint part 320 is used to connect with the busbar 32 and the flexible circuit board 31, and the other end of the lap joint part 320 is lap jointed with the circuit layer 333 through the second opening 335. Figure 5 and Figure 7 In some embodiments, as shown in FIGS. 1A and 1B, the substrate layer 331 and the adhesive layer 332 comprise a second opening 335 arranged through the substrate layer 331 and the adhesive layer 332, and at least part of the circuit layer 333 is exposed by the second opening 335. One end of the lap joint part 320 is used to connect with the busbar 32 and the flexible circuit board 31, and the other end of the lap joint part 320 is lap jointed with the circuit layer 333 through the second opening 335.

[0097] In these embodiments, the circuit layer 333 can be directly connected with the lap joint part 320 through the second opening 335, which simplifies the connection process. Direct lap joint can reduce the number of welding points, thereby reducing the risk of poor welding and improving the reliability of the connection.

[0098] Optionally, the circuit layer 333 can be a signal line 333a, and at least part of the signal line 333a is exposed by the second opening 335. The other end of the lap joint part 320 can be lap jointed with the signal line 333a through the second opening 335. The signal line 333a located in the circuit layer 333 can be directly connected with the lap joint part 320 through the second opening 335, which simplifies the connection process. This can reduce the risk of poor welding and improve the reliability of the connection.

[0099] In some embodiments, the material of the lap joint part 320 comprises copper.

[0100] In these embodiments, the material of the overlap 320 includes copper, which is suitable for the busbar 32 and the flexible circuit board 31, and is easy to connect.

[0101] Optionally, the substrate layer 331 may include a PI substrate, and the circuit layer 333 may include a copper substrate. The bonding pads of the overlap portion 320 and the circuit layer 333, and the overlap portion 320 and the flexible circuit board 31 can be directly welded by laser welding, saving welding processes.

[0102] Please see Figure 1 , Figures 3 to 5 According to an embodiment of the second aspect of this application, a connection structure 30 is provided. The connection structure 30 is used to connect a flexible circuit board 31 and a busbar 32. The connection structure 30 includes a body portion 300 and two overlapping portions 320. The body portion 300 includes a connecting portion 311 and at least one through groove 312. The connecting portion 311 surrounds to form the through groove 312. The two overlapping portions 320 are respectively connected to both sides of the body portion 300 along a first direction X. One overlapping portion 320 is used to connect with the busbar 32, and the other overlapping portion 320 is used to connect with the flexible circuit board 31.

[0103] In this application embodiment, a connection structure 30 is provided for connecting a flexible circuit board 31 and a busbar 32. The connection structure 30 includes a body portion 300 and an overlapping portion 320. The body portion 300 is used to collect voltage signals and can realize functions such as voltage monitoring and protection circuits. The body portion 300 includes a connecting portion 311 and at least one through groove 312. The connecting portion 311 surrounds to form the through groove 312, which is used to reserve deformation space to release the stress transmitted to the connecting portion 311 when the battery cell 20 is heated and expanded, thereby reducing the possibility of deformation of the connecting portion 311 causing the circuit of the flexible circuit board 31 to break. The overlapping portion 320 is connected to both sides of the body portion 300 along the first direction X, and the overlapping portion 320 is used for electrical connection with the busbar 32 or the flexible circuit board 31. By using the connection structure 30 of this application embodiment, the through groove 312 is provided on the body part 300 that connects the flexible circuit board 31 and the busbar 32, which reduces the possibility of circuit breakage of the flexible circuit board 31, simplifies the manufacturing process of the flexible circuit board 31, reduces costs and increases service life.

[0104] An embodiment of the third aspect of this application also provides an electrical device, including the battery device and connection structure 30 described above.

[0105] In the scheme of the embodiments of the present application, the present application provides a kind of electric equipment, and the electric equipment includes battery device, battery device includes flexible circuit board 31 and busbar 32, and the connecting structure 30 of connecting flexible circuit board 31 and busbar 32, connecting structure 30 includes body part 300 and lap joint 320.Body part 300 is used to collect voltage signal, can realize voltage monitoring and protection circuit function etc.Body part 300 includes connecting part 311 and at least one through slot 312, connecting part 311 is enclosed to form through slot 312, and through slot 312 is used to reserve deformation space to release the stress when battery monomer 20 is expanded by heat and is transferred to connecting part 311, to reduce the possibility that connecting part 311 is deformed and causes flexible circuit board 31 line to be pulled off.Lap joint 320 is connected to the two sides of body part 300 along the first direction X, and lap joint 320 is used to be electrically connected with busbar 32 or flexible circuit board 31.Through the connecting structure 30 of the embodiments of the present application, through slot 312 is arranged on the body part 300 of connecting flexible circuit board 31 and busbar 32, reduce the possibility of flexible circuit board 31 line breakage while simplifying the manufacturing process of flexible circuit board 31, reduce cost while improving service life.

[0106] According to some embodiments of the present application, the present application provides a battery device, comprising a flexible circuit board 31 and a busbar 32, and a connecting structure 30 connecting the flexible circuit board 31 and the busbar 32, the connecting structure 30 is used for connecting the flexible circuit board 31 and the busbar 32 of the battery device 100, the connecting structure 30 comprises a body part 300 and a lap joint part 320. The body part 300 comprises a connecting part 311 and at least one through slot 312, the connecting part 311 encloses the through slot 312, the lap joint part 320 is connected to both sides of the body part 300 along the first direction X, and the lap joint part 320 is used for connecting the busbar 32 or the flexible circuit board 31. The through slot 312 comprises a first sub-slot 312a and a second sub-slot 312b, the first sub-slot 312a and the second sub-slot 312b are communicated with each other, and the extension directions of the first sub-slot 312a and the second sub-slot 312b are intersected. The body part 300 has two side edges 313 oppositely arranged along the second direction Y, the second sub-slot 312b is extended from the first sub-slot 312a towards the side edge 313, and / or the extension direction of the first sub-slot 312a is inclined relative to the first direction. There are two through slots 312, and the two through slots 312 are arranged at intervals. The first sub-slots 312a of the two through slots 312 are parallel to each other, and / or the second sub-slots 312b of the two through slots 312 are parallel to each other. The body part 300 comprises two first sub-segments 314 and a second sub-segment 315 connected between the two first sub-segments 314, and each first sub-segment 314 is connected with each lap joint part 320. There is also a buffer part 317 connected between the first sub-segment 314 and the second sub-segment 315, and the connection strength of the buffer part 317 with the first sub-segment 314 and / or the second sub-segment 315 is smaller than the connection strength of the first sub-segment 314 and the second sub-segment 315 on the side of the second sub-slot 312b close to the first sub-slot 312a. The body part 300 is provided with a signal line 333a, and the signal line 333a is provided with a fuse part 330, which is used for fusing to cut off the signal line 333a when the current is too large. The body part 300 comprises a substrate layer 331, an adhesive layer 332, a circuit layer 333 and a protective layer 334 which are sequentially laminated. The circuit layer 333 comprises the signal line 333a, the substrate layer 331 and the adhesive layer 332 comprise a second opening 335 arranged through, at least part of the signal line 333a is exposed by the second opening 335, one end of the lap joint part 320 is used for connecting the busbar 32 and the flexible circuit board 31, and the other end of the lap joint part 320 is lapped with the signal line 333a through the second opening 335. The lap joint part 320 comprises a substrate and a lapping layer which are sequentially laminated, and the material of the lapping layer is copper.

[0107] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: A flexible circuit board and a busbar, and a connection structure connecting the flexible circuit board and the busbar, the connection structure comprising: The body portion includes a connecting portion and at least one through groove, wherein the connecting portion encloses and forms the through groove; Two overlapping portions are respectively connected to both sides of the main body along the first direction, one of the overlapping portions is connected to the busbar, and the other overlapping portion is connected to the flexible circuit board.

2. The battery device of claim 1, wherein The through slot includes a first sub-slot and a second sub-slot, which are interconnected and whose extension directions intersect.

3. The battery device of claim 2, wherein The main body has two sides disposed opposite each other along a second direction, the second sub-groove extends from the first sub-groove toward the sides, and / or the extension direction of the first sub-groove is inclined relative to the first direction.

4. The battery device of claim 2, wherein There are two through slots, which are spaced apart.

5. The battery device of claim 3, wherein The first sub-slots of the two through slots are parallel to each other, and / or the second sub-slots of the two through slots are parallel to each other.

6. The battery device of claim 3, wherein The main body includes two first sub-segments arranged at intervals along the first direction and a second sub-segment connected between the two first sub-segments, and each first sub-segment is connected to each of the overlapping portions; On the side of the second sub-slot away from the first sub-slot, the first sub-segment and the second sub-segment enclose each other to form a first opening, which is connected to the second sub-slot. Alternatively, a buffer section is also connected between the first sub-segment and the second sub-segment, and the connection strength between the buffer section and the first sub-segment and / or the second sub-segment is less than the connection strength between the first sub-segment and the second sub-segment on the side of the second sub-slot closer to the first sub-slot.

7. The battery device of claim 1, wherein The main body is provided with a signal line, and a fuse is provided on the signal line. The fuse is configured to melt when the temperature reaches a threshold.

8. The battery device of claim 1, wherein The main body includes a substrate layer, an adhesive layer, a circuit layer, and a protective layer stacked in sequence. The overlapping portion is disposed on the side of the substrate layer away from the adhesive layer and is connected to the circuit layer.

9. The battery device of claim 8, wherein, The substrate layer and the adhesive layer include a through-hole second opening, at least a portion of the circuit layer is exposed through the second opening, one end of the overlapping portion is used to connect with the busbar and the flexible circuit board, and the other end of the overlapping portion overlaps with the circuit layer through the second opening.

10. The battery device of claim 1, wherein The material of the overlapping part includes copper.

11. A connection structure for connecting a flexible circuit board and a bus bar of a battery device, characterized by, The connection structure includes: The body portion includes a connecting portion and at least one through groove, wherein the connecting portion encloses and forms the through groove; Two overlapping portions are respectively connected to both sides of the main body along the first direction, one of the overlapping portions is connected to the busbar, and the other overlapping portion is connected to the flexible circuit board.

12. An electrical device, characterized by Includes the battery device and connection structure as described in any one of claims 1 to 11.

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