Circuit board, sampling assembly, battery device and electric equipment

Abstract

The utility model is suitable for the technical field of batteries, and provides a circuit board, a sampling assembly, a battery device and electric equipment. The circuit board comprises a base material and a safety line arranged on the base material, the safety line comprises at least one bending section, the bending section comprises a fusing part and a reinforcing part which are connected, the path length of the fusing part is larger than that of the reinforcing part, and the line width of the reinforcing part is larger than that of the fusing part. According to the technical scheme provided by the embodiment of the invention, the risk of deformation, damage or fracture of the safety line in the manufacturing and using process can be reduced.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a circuit board, a sampling component, a battery device and an electrical device. Background Art

[0002] A fuse is a device used to protect circuit safety. The fuse can automatically disconnect when the current is overloaded, thereby preventing the components in the circuit from being damaged due to overcurrent.

[0003] At present, in order to simplify the fuse structure and improve the integration of electronic equipment, the fuse circuit can be directly set on the circuit board. The fuse circuit on the circuit board includes a variety of manufacturing processes, and each manufacturing process includes multiple processes. However, due to the structure of the fuse circuit itself, there is a risk of unexpected deformation, damage or breakage of the fuse circuit during the processing and manufacturing process. Utility Model Content

[0004] In view of this, the embodiments of the present application provide a circuit board, a sampling component, a battery device and an electrical device, which can reduce the risk of deformation, damage or breakage of the fuse circuit during manufacturing and use.

[0005] An embodiment of the first aspect of the present application provides a circuit board, comprising: a substrate; a fuse circuit, arranged on the substrate, the fuse circuit comprising at least one bending section, the bending section comprising a fuse part and a reinforcement part connected to each other, the path length of the fuse part being greater than the path length of the reinforcement part, and the line width of the reinforcement part being greater than the line width of the fuse part.

[0006] In the circuit board provided in the embodiment of the present application, the design of the bending section can extend the line length of the fuse circuit within a limited space, so that the fuse circuit is more likely to generate heat and melt under overcurrent conditions, thereby improving the fusing performance and reliability of the fuse circuit. Furthermore, by improving the structure of the bending section, designing a fuse part and a reinforcement part in the bending section, making the path length of the fuse part greater than the path length of the reinforcement part, and increasing the line width of the reinforcement part, it is possible to improve the mechanical strength of the bending section at a local position while ensuring the fusing performance of the fuse circuit, and improve the bonding effect between the bending section and the substrate, thereby reducing the risk of unexpected deformation, damage or breakage during the manufacture and use of the fuse circuit.

[0007] In some embodiments, the bending section has turning points, and reinforcement portions are disposed at at least some of the turning points.

[0008] In the above design, locally increasing the line width at the turning position of the bending section can improve the mechanical strength at the turning point of the bending section and the bonding strength between the bending section and the substrate, thereby helping to maintain the line shape of the bending section.

[0009] In some embodiments, the safety circuit includes a plurality of bending sections, the plurality of bending sections are connected in sequence, and a reinforcement portion is provided at the connection between adjacent bending sections.

[0010] In the above design, the line width is locally increased at the connection position of the bending section, which can improve the mechanical strength of the connection of the bending section and the bonding strength between the bending section and the substrate, thereby helping to maintain the line shape of the entire fuse circuit.

[0011] In some embodiments, the outer contour of the reinforcement portion is a polygonal structure, a circular structure, or an elliptical structure.

[0012] In the above design, the reinforcement part can be of various structures, and the design of the insurance line is more flexible. At the same time, the circular and elliptical reinforcement parts have good tensile resistance and can effectively resist line deformation.

[0013] In some embodiments, the reinforcement portion is a continuously extending planar structure.

[0014] In the above design, the bonding effect between the reinforcement part and the base material is better, so that the circuit deformation can be better resisted.

[0015] In some embodiments, the fuse portion is a linear structure, the line width D1 of the fuse portion is 0.12mm-0.2mm, the reinforcement portion is a circular structure or an elliptical structure, the diameter R of the reinforcement portion of the circular structure is ≥0.7mm, and the length L1 of the short axis of the reinforcement portion of the elliptical structure is ≥0.7mm.

[0016] In the above design, the dimensions of the fuse part and the reinforcement part are reasonably designed. The reinforcement part has high mechanical strength and good tensile strength, which can effectively resist the deformation stress generated during the preparation or use process, and reduce the risk of unexpected deformation, fracture or damage in the fuse circuit, especially in the bending section.

[0017] In some embodiments, the fuse portion is a linear structure, the line width D1 of the fuse portion is 0.12 mm-0.2 mm, the reinforcement portion is a rectangular structure, and the short side dimension D2 of the reinforcement portion is ≥3D1.

[0018] In the above design, the dimensions of the fuse part and the reinforcement part are reasonably designed, the reinforcement part has a simple structure and high mechanical strength, which can effectively resist the deformation stress generated during the preparation or use process, and reduce the risk of unexpected deformation, breakage or damage to the fuse circuit, especially at the bending section.

[0019] In some embodiments, the path length L2 of each fuse section is ≥1 mm.

[0020] In the above design, the fuse part has a reasonable size, good fuse performance, and is easy to process and manufacture.

[0021] In some embodiments, the projected area of ​​each fuse section on the substrate is S1, the projected area of ​​each reinforcement section on the substrate is S2, and the ratio of S1 to S2 is 1:6-1:3.

[0022] In the above design, the sizes of the fuse part and the reinforcement part are reasonable, which can balance the fusing performance and structural strength of the insurance circuit.

[0023] In some embodiments, the fuse portion is a straight line or an arc line.

[0024] In the above design, the straight line structure is regular. When pulled by external force, stress concentration is not likely to occur in the middle of the line, so the risk of deformation, fracture or breakage is relatively low. The arc structure has a certain curvature and can provide a larger line length in a limited space, thereby improving the fuse performance of the insurance line by extending the line length.

[0025] In some embodiments, the substrate is a flexible substrate.

[0026] In the above design, the circuit board is a flexible circuit board, and since the flexible substrate has good flexibility, it can be bent into various shapes, thereby being able to meet the design requirements of a variety of products.

[0027] An embodiment of a second aspect of the present application provides a sampling component, including the circuit board in the first aspect.

[0028] The sampling component provided in the embodiment of the present application improves the reliability and safety of the sampling component by adopting the circuit board in the first aspect.

[0029] An embodiment of a third aspect of the present application provides a battery device, comprising a battery cell and the sampling assembly of the second aspect, wherein a circuit board of the sampling assembly is electrically connected to the battery cell.

[0030] The battery device provided in the embodiment of the present application improves the reliability and safety of the battery device by adopting the sampling component in the second aspect.

[0031] An embodiment of the fourth aspect of the present application provides an electrical device, comprising the battery device of the third aspect.

[0032] The electrical equipment provided in the embodiment of the present application improves the reliability and safety of the electrical equipment by adopting the battery device in the third aspect.

[0033] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or conventional technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0035] Figure 1 is a schematic structural diagram of a vehicle provided in an embodiment of the present application;

[0036] Figure 2 is an exploded view of a battery device provided in an embodiment of the present application;

[0037] Figure 3 is a schematic diagram of the structure of a battery cell provided in an embodiment of the present application;

[0038] Figure 4 It is a schematic diagram of the structure of the sampling component provided in the embodiment of the present application;

[0039] Figure 5 It is a structural schematic diagram of a circuit board provided by an embodiment of the present application;

[0040] Figure 6 It is a structural schematic diagram of the insurance circuit provided in the embodiment of the present application;

[0041] Figure 7 It is a schematic diagram of the structure of a circuit board provided in another embodiment of the present application.

[0042] The meanings of the marks in the figure are:

[0043] 1000, vehicle; 100, battery device; 200, controller; 300, motor;

[0044] 10. Box body; 11. First box body; 12. Second box body;

[0045] 20. Battery cells;

[0046] 30. Sampling components;

[0047] 40. Circuit board; 41. Base material; 42. Fuse circuit; 421. Fuse part; 422. Reinforcement part. DETAILED DESCRIPTION

[0048] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0050] 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 clearly and specifically defined.

[0051] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0052] 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, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0053] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0054] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings. They 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0055] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0056] Die cutting is a common circuit manufacturing process. When using the die cutting process to make the fuse circuit on the circuit board, it is necessary to first cut out the basic shape of the fuse circuit on the substrate of the circuit board, and then remove the cut waste from the substrate by bonding or other means. During the waste removal process, the mold will contact the fuse circuit and the waste at the same time, and will pull the fuse circuit. Stress concentration problems may occur in local positions of the fuse circuit, especially in positions with special-shaped structures such as bends. If the bonding force between the fuse circuit and the substrate is insufficient, the fuse circuit may be deformed, damaged or broken.

[0057] The bonding effect between the fuse circuit and the substrate is directly related to the structure of the fuse circuit, and the structure of the fuse circuit determines its fusing performance. Therefore, it is necessary to provide a solution to solve the risks faced in the manufacturing process while ensuring the fusing performance of the fuse circuit.

[0058] Based on the above problems, an embodiment of the present application provides a circuit board, including a substrate and a fuse circuit arranged on the substrate, wherein the fuse circuit includes a bending section, and the bending section includes a fuse part and a reinforcement part connected to each other, wherein the line width of the reinforcement part is greater than the line width of the fuse part. In this way, by providing a bending section and providing a fuse part in the bending section, it can be ensured that the fuse circuit has good fuse performance, and by providing a reinforcement part in the bending section, the structural strength of the fuse circuit and the bonding effect with the substrate can be improved, thereby reducing the risk of deformation, damage or breakage of the fuse circuit during production and use.

[0059] The battery device provided in the embodiment of the present application can be used in various energy storage systems that use the battery device as a power source or use the battery device as an energy storage element. The electrical equipment can be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, a battery car, an electric car, a ship, a spacecraft, and the like. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like, and the spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, and the like.

[0060] For the convenience of explanation, the embodiment of the present application is described by taking an electrical device as a vehicle 1000 as an example.

[0061] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000, for example, the battery device 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0062] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0063] Please refer to Figure 2 , Figure 2 An exploded view of a battery device 100 provided in some embodiments of the present application. The battery device 100 includes a case 10 and a battery cell 20, and the battery cell 20 is contained in the case 10. Among them, the case 10 is used to provide a storage space for the battery cell 20, and the case 10 can adopt a variety of structures. In some embodiments, the case 10 may include a first case 11 and a second case 12, and the first case 11 and the second case 12 cover each other, and the first case 11 and the second case 12 jointly define a storage space for accommodating the battery cell 20. The second case 12 may be a hollow structure with one end open, and the first case 11 may be a plate-like structure, and the first case 11 covers the open side of the second case 12, so that the first case 11 and the second case 12 jointly define a storage space; the first case 11 and the second case 12 may also be hollow structures with one side open, and the open side of the first case 11 covers the open side of the second case 12. Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid, etc.

[0064] In some embodiments, the box 10 can be used as a part of the chassis structure of the vehicle 1000. For example, part of the box 10 can become at least a part of the floor of the vehicle 1000, or part of the box 10 can become at least a part of the cross beam and longitudinal beam of the vehicle 1000.

[0065] In some embodiments, the battery device 100 may not include the box body 10 , but rather a plurality of battery cells 20 may be connected and integrated into a whole by a necessary fixing structure and then assembled into the vehicle 1000 .

[0066] In the battery device 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; or, the multiple battery cells 20 may be first connected in series, in parallel, or in a mixed connection to form a battery cell assembly, and the multiple battery cell assemblies are then connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery device 100 may also include other structures, for example, the battery device 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0067] See also Figure 3 , Figure 3 A schematic diagram of the structure of a battery cell 20 provided in some embodiments of the present application. A battery cell 20 refers to the smallest unit constituting a battery device 100. Each battery cell 20 may be a secondary battery. A secondary battery refers to a battery cell 20 that can be continuously used by activating active materials by charging after the battery cell 20 is discharged. The battery cell 20 may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0068] See also Figure 4 , Figure 4 A schematic diagram of the structure of the sampling component 30 provided for some embodiments of the present application. The battery device 100 also includes a sampling component 30, which is a part of the battery management system and is mainly used to collect and monitor various status information of the battery device 100, such as voltage monitoring, current monitoring, temperature monitoring, etc. The sampling component 30 includes a circuit board 40, which can be arranged in the housing 10. The circuit board 40 is electrically connected to the battery cell 20, and is used to convert the collected analog signals such as voltage, current, temperature, etc. of the battery cell 20 or a battery cell assembly composed of several battery cells 20 into digital signals, and transmit them to the main control board of the battery management system, so as to identify and adjust the electrical properties and working status of the battery cell 20 or the battery cell assembly, so as to ensure the normal operation of the battery device.

[0069] The technical solution provided in the embodiments of the present application is described below with reference to the accompanying drawings.

[0070] According to some embodiments of the present application, referring to Figure 5 and Figure 6 , Figure 5 A schematic diagram of the structure of a circuit board 40 provided in some embodiments of the present application, Figure 6 A schematic diagram of the structure of a fuse circuit 42 provided in some embodiments of the present application. The embodiment of the first aspect of the present application provides a circuit board 40. The circuit board 40 includes a substrate 41 and a fuse circuit 42 disposed on the substrate 41. The fuse circuit 42 includes at least one bending section, the bending section includes a fuse part 421 and a reinforcement part 422 connected to each other, the path length of the fuse part 421 is greater than the path length of the reinforcement part 422, and the line width of the reinforcement part 422 is greater than the line width of the fuse part 421.

[0071] The substrate 41 is the supporting base of the circuit board 40, and is used to provide physical support for various electronic components and circuits on the circuit board 40, and to realize electrical connection between different electronic components. The substrate 41 can be of various types, such as a single-sided board, a double-sided board, or a multi-layer board.

[0072] The fuse circuit 42 is an overcurrent protection circuit that can be melted to disconnect the circuit when the current is overloaded. Its working principle is: when the current passes through the fuse circuit 42, heat is generated. When the current passing through the fuse circuit 42 is lower than the rated current of the circuit, the heat generated is relatively small, and the temperature of the fuse circuit 42 is kept within a safe range, so that the fuse circuit 42 can be used normally; when the current passing through the fuse circuit 42 is higher than the rated current of the circuit, the heat generated increases significantly, and the heat continues to accumulate and causes the temperature of the fuse circuit 42 to exceed the melting point of the fuse circuit 42 material, so that the fuse circuit 42 will melt and disconnect. The fuse circuit 42 can be connected in series to the power supply circuit or the power supply circuit of various electronic components to ensure the safe operation of the entire circuit. The fusing performance of the fuse circuit 42 is related to factors such as wire material and geometric dimensions. The material of the fuse circuit 42 can be a variety of materials, such as copper, tin, lead-tin alloy, nickel-chromium alloy, etc.

[0073] The bending section is in a bent or curved shape and can be composed of multiple straight lines or arc lines. The design of the bending section can extend the length of the fuse line 42 in a limited space. According to the resistance formula R=ρL / A, ρ is the resistivity of the material of the fuse line 42, L is the length of the fuse line 42, and A is the cross-sectional area of ​​the fuse line 42. Under the premise of the same resistivity and cross-sectional area, the longer the length of the fuse line 42, the greater the corresponding resistance. According to the Joule's law formula Q=I 2Rt, where I is the current passing through the fuse circuit 42, R is the resistance of the fuse circuit 42, and t is the overcurrent time. Under the same current and time, the greater the resistance of the fuse circuit 42, the more heat is generated. Therefore, the design of the bending section increases the line length of the fuse circuit 42, thereby improving the response speed and reliability of the fuse circuit 42 being blown.

[0074] The fuse part 421 is the core part of the fuse circuit 42. The fuse part 421 has a small line width, a relatively large resistance, and a relatively low maximum current that can be carried. When the current in the fuse circuit 42 is overloaded, the fuse part 421 will heat up quickly and melt first. The reinforcement part 422 is arranged between the fuse parts 421. Due to the large line width of the reinforcement part 422, its mechanical strength, structural stability and bonding force with the substrate 41 are also relatively large.

[0075] The path length of the fuse part 421 is the actual track length of the fuse part 421 in the extension direction of the fuse line 42. The greater the path length of the fuse part 421, the greater the distance traveled by the current flowing through the fuse part 421. Similarly, the path length of the reinforcement part 422 is the actual track length of the reinforcement part 422 in the extension direction of the fuse line 42.

[0076] It should be noted that the fuse part 421 is used to blow when the current passing through the fuse circuit 42 exceeds the rated value. The overcurrent rated value of the fuse circuit 42 refers to the maximum allowable current value at which the fuse circuit 42 can work normally for a long time without blowing. The overcurrent rated value is predetermined and the fuse circuit 42 is designed according to the rated value.

[0077] In the circuit board 40 provided in the embodiment of the present application, the fuse circuit 42 includes at least one bending section. The design of the bending section can extend the line length of the fuse circuit 42 within a limited space, so that the fuse circuit 42 is more likely to generate heat and melt under overcurrent conditions, thereby improving the fusing performance and reliability of the fuse circuit 42. Furthermore, by improving the structure of the bending section, designing a fuse part 421 and a reinforcement part 422 in the bending section, making the path length of the fuse part 421 greater than the path length of the reinforcement part 422, and increasing the line width of the reinforcement part 422, it is possible to improve the mechanical strength of the bending section at a local position while ensuring the fusing performance of the fuse circuit 42, and improve the bonding effect between the bending section and the substrate 41, thereby reducing the risk of unexpected deformation, damage or breakage during the manufacture and use of the fuse circuit 42.

[0078] In some embodiments, the bending section has a turning point, and a reinforcement portion 422 is disposed at at least part of the turning point.

[0079] A turning point is a point where the direction of a route changes from one direction to another.

[0080] The turning point of the bending section is prone to stress concentration problems due to the change in line direction. Locally increasing the line width at the turning position can improve the mechanical strength at the turning point of the bending section and the bonding strength between the line and the substrate 41, thereby helping to maintain the line shape of the bending section and further reducing the risk of deformation, damage or breakage of the insurance circuit 42 during manufacturing or use.

[0081] It should be noted that each bending section has at least one reinforcement portion 422, and the reinforcement portion 422 can be arranged at the turning point of the bending section, or at a position other than the turning point. For example, in some other embodiments, the bending section includes two straight lines with different directions, and the reinforcement portion 422 can be arranged at the midpoint of each straight line.

[0082] See also Figure 5 In some embodiments, the safety circuit 42 includes a plurality of bending sections, which are connected in sequence, and a reinforcing portion 422 is provided at the connection between adjacent bending sections.

[0083] For example, in a specific embodiment, the safety circuit 42 includes three bending sections, which are connected in sequence, and a reinforcement portion 422 is provided at the connection between the bending sections.

[0084] By designing multiple bending sections, the overall path length of the fuse circuit 42 can be further increased within a limited space. At the same time, the line direction at the connection between adjacent bending sections changes, which can easily cause stress concentration problems. Locally increasing the line width at the connection between the bending sections can improve the mechanical strength of the connection between the bending sections and the bonding strength between the substrates 41, thereby helping to maintain the line shape of the entire fuse circuit 42 and further reducing the risk of deformation, damage or breakage of the fuse circuit 42 during manufacturing or use.

[0085] In some embodiments, reinforcement portions 422 are provided at turning points of the bending segments and at connections between adjacent bending segments.

[0086] In the embodiments provided in the present application, the reinforcing portion 422 may have various shapes. For example, the outer contour of the reinforcing portion 422 may be a polygonal structure, a circular structure, or an elliptical structure.

[0087] For example, in some embodiments, the outer contour of the reinforcing portion 422 is a circular structure or an elliptical structure. The circular structure or the elliptical structure has good tensile resistance, and when being pulled by external force, it is easier to maintain the integrity of the structure and the line shape of the bending section.

[0088] For example, in some embodiments, the outer contour of the reinforcement portion 422 is a polygonal structure, such as a square structure, a rectangular structure, a diamond structure, a hexagonal structure, etc.

[0089] It can be understood that the safety circuit 42 may include multiple sections of reinforcement parts 422 , and the outer contours of the multiple sections of reinforcement parts 422 may be the same or different.

[0090] In some other embodiments, the reinforcing portion 422 may also be designed to have other irregular geometric shapes, provided that the reinforcing portion 422 can enhance the bonding effect between the circuit and the substrate 41 .

[0091] See also Figure 5 In some embodiments, the reinforcing portion 422 is a continuously extending planar structure.

[0092] The “continuously extended planar structure” can be understood as the reinforcing portion 422 having a complete and uninterrupted surface, with no breakpoints or hollowing out on the reinforcing portion 422 .

[0093] In the above embodiment, the bonding strength between the reinforcing portion 422 and the substrate 41 is higher, and can better resist circuit deformation.

[0094] In some embodiments, the reinforcement portion 422 may also be designed as a grid structure, that is, the reinforcement portion 422 has a hollow portion. Figure 7 , Figure 7 A schematic diagram of the structure of a circuit board 40 is provided for another embodiment of the present application. In a specific embodiment, a hollow portion is provided at the center of the reinforcing portion 422. This design is beneficial for improving the fusing performance of the fuse circuit 42 and saving materials while enhancing the structural stability of the fuse circuit 42.

[0095] In some embodiments, the fuse portion 421 is a linear structure, and the line width D1 of the fuse portion 421 is 0.12 mm-0.2 mm.

[0096] For example, the line width D1 of the fuse portion 421 may be 0.12 mm, 0.15 mm, 0.18 mm, or 0.2 mm.

[0097] The fuse part 421 may be a straight line or an arc line, and the line width of the fuse part 421 refers to the line width in the direction perpendicular to the line extension direction. It should be noted that the line widths of the fuse part 421 may be the same or different at different locations. When the line widths of the fuse part 421 are different at different locations, the line widths at the smallest cross-sectional dimension and the largest cross-sectional dimension on the fuse part 421 need to comply with the line width range values ​​described above.

[0098] Furthermore, in some embodiments, the reinforcement portion 422 is a circular structure, and a diameter R of the reinforcement portion 422 is ≥ 0.7 mm.

[0099] For example, the line width D1 of the fuse portion 421 may be 0.12 mm, 0.15 mm, 0.18 mm, or 0.2 mm, and the diameter of the circular reinforcement portion 422 may be 0.7 mm.

[0100] Furthermore, in some embodiments, the reinforcement portion 422 is an elliptical structure, and the minor axis L1 of the reinforcement portion 422 is ≥0.7 mm.

[0101] For example, the line width D1 of the fuse portion 421 may be 0.12 mm, 0.15 mm, 0.18 mm, or 0.2 mm, and the length of the minor axis of the reinforcing portion 422 of the elliptical structure may be 0.7 mm.

[0102] Furthermore, in some embodiments, the reinforcing portion 422 is a rectangular structure, and a short side dimension D2 ≥ 3D1 of the reinforcing portion 422 .

[0103] For example, the line width D1 of the fuse portion 421 may be 0.12 mm, 0.15 mm, 0.18 mm, or 0.2 mm, and the short side dimension D2 of the rectangular reinforcement portion 422 may be 0.6 mm.

[0104] The reinforcement part 422 is mainly used to improve the structural strength of the line. The reinforcement part 422 is designed to the above shape and the size is limited to the above range. It has high mechanical strength and can effectively resist the deformation stress generated during the preparation or use process, thereby reducing the risk of unexpected deformation, fracture or damage of the insurance line 42, especially at the bending section.

[0105] In some implementations, the path length L2 of each fuse section 421 is ≥ 1 mm.

[0106] The above design can ensure, on the one hand, that the fuse part 421 has sufficient heat accumulation and can melt when the current is overloaded. On the other hand, if the fuse part 421 is too short, it will be difficult to control the line size and integrity during processing. By increasing the path length of the fuse part 421, it is also helpful to reduce the processing difficulty of the fuse line 42.

[0107] In some embodiments, the projected area of ​​each fuse section 421 on the substrate 41 is S1, the projected area of ​​each reinforcement section 422 on the substrate 41 is S2, and the ratio of S1 to S2 is 1:6-1:3.

[0108] For example, the ratio of S1 to S2 may be 1:6, 1:5, 1:4, or 1:3. The projected areas of the fuse portion 421 and the reinforcement portion 422 on the substrate 41 reflect the relative sizes of the two.

[0109] It should be noted that the design of the fuse portion 421 and the reinforcement portion 422 must first meet the respective line width or diameter requirements, and then the line length requirements and the number of sections can be considered.

[0110] In the bending section, the fuse part 421 mainly plays a role of fusing, so the proportion of the fuse part 421 will affect the fusing performance of the insurance circuit 42, and the reinforcement part 422 is mainly used to strengthen the combination of the circuit and the substrate 41, so the proportion of the reinforcement part 422 will affect the structural stability of the insurance circuit 42. In the above embodiment, by reasonably limiting the design ratio of the fuse part 421 and the reinforcement part 422, the fusing performance and structural strength of the insurance circuit 42 can be balanced, which is conducive to improving the reliability of the insurance circuit 42.

[0111] See also Figure 5 In some embodiments, the fuse portion 421 is a straight line.

[0112] For example, the safety circuit 42 includes a plurality of straight line segments, and a portion of the safety circuit 42 is V-shaped or W-shaped.

[0113] The angle between adjacent fuse sections 421 is determined according to design requirements. It can be understood that the smaller the angle between two adjacent fuse sections 421 is, the greater the circuit density is.

[0114] On the one hand, the straight line has a regular structure, and when it is pulled by external force, stress concentration is not likely to occur in the middle of the line, so the risk of deformation, fracture or breakage is relatively low. On the other hand, in this design, the extension directions of the two adjacent straight lines are different, and there are turning points in the line, so there may be a sudden change in the electric field when the current passes through the bending section, making the line's fusing performance better.

[0115] See also Figure 6 In some embodiments, the fuse portion 421 is an arc-shaped line.

[0116] For example, the safety circuit 42 includes multiple arc lines, and the safety circuit 42 is partially or entirely wavy.

[0117] The arc structure has a certain curvature, and the curvature determines the bending degree of the arc. It can be understood that the greater the curvature, the greater the bending degree of the arc, and the greater the line density.

[0118] The above design provides an optional circuit structure, which improves the design flexibility of the fuse circuit 42. At the same time, the wavy circuit structure can provide a larger circuit length in a limited space, thereby improving the fusing performance of the fuse circuit 42 by extending the circuit length.

[0119] In some embodiments, the fuse circuit 42 includes at least five fuse sections 421 .

[0120] The number of fuses 421 in the insurance circuit 42 depends on the structure of the bending section and the location of the reinforcement 422. For example, in a bending section, if a reinforcement 422 is provided in the middle of the circuit, two fuses 421 are formed in the bending section; for example, in a bending section, if only a reinforcement 422 is provided at the end of the circuit, the bending section as a whole forms one fuse 421; for example, in a bending section, if two reinforcements 422 are provided at intervals in the circuit, three fuses 421 are formed in the bending section.

[0121] For example, in a specific embodiment, the insurance circuit 42 may include multiple bending sections, in which four sections of reinforcement parts 422 are arranged to form five sections of fuse parts 421. For example, in a specific embodiment, the insurance circuit 42 includes a bending section, in which four sections of reinforcement parts 422 are arranged at intervals to form five sections of fuse parts 421. When the insurance circuit 42 includes multiple sections of fuse parts 421, the line width and path length of the multiple sections of fuse parts 421 may be the same or different.

[0122] The necessary condition for the fuse circuit 42 to blow is that heat accumulation causes the circuit temperature to exceed the melting point of the wire. However, due to possible processing errors when the circuit is manufactured, and the circuit generates heat while also dissipating heat, these factors will lead to uncertainty in the blowing of the fuse circuit 42. For example, at a local location, the current of the fuse circuit 42 is overloaded, and this section of the fuse circuit 42 cannot be blown in time.

[0123] In the above embodiment, the fuse circuit 42 includes multiple fuse sections 421 , each fuse section 421 is equivalent to an independent working unit and can be fused independently. This design is equivalent to providing multiple fuse paths, which is beneficial to improving the reliability of the fuse circuit 42 .

[0124] In some embodiments, substrate 41 is a flexible substrate.

[0125] The flexible substrate can be made of a variety of materials, such as thin film materials such as polyimide and polyester.

[0126] The flexible substrate has good flexibility and can be bent into various shapes to meet the design requirements of a variety of products.

[0127] It can be understood that the flexible circuit board 40 may be bent into various shapes during use and may cause pulling on various circuits on the substrate 41. Designing a reinforcement portion 422 at a local position of the fuse circuit 42 can improve the structural strength of the fuse circuit 42, so that the fuse circuit 42 can resist the deformation stress caused by such bending, thereby better maintaining the circuit shape.

[0128] In a specific embodiment provided by the present application, a circuit board 40 includes a substrate 41 and a fuse circuit 42 disposed on the substrate 41, wherein the fuse circuit 42 includes multiple bending sections, which are sequentially connected to form multiple turning points, and circular reinforcements 422 are disposed at the multiple turning points, and fuse sections 421 are disposed between the multiple reinforcements 422. The path length of each fuse section 421 is greater than or equal to 1 mm, the line width of the fuse section 421 is 0.12 mm-0.2 mm, and the diameter of the reinforcement 422 is greater than or equal to 0.7 mm. The circuit board 40 provided in this embodiment improves the structure of the fuse circuit 42, designs multiple bending sections, and designs reinforcements 422 in the bending sections, thereby improving the mechanical strength of the fuse circuit 42 and the bonding effect with the substrate 41 while ensuring the fuse performance of the fuse circuit 42, thereby effectively reducing the risk of unexpected deformation, damage or breakage of the fuse circuit 42 during preparation or use, and improving the reliability of the fuse circuit 42 and the circuit board 40.

[0129] See also Figure 4 The embodiment of the second aspect of the present application provides a sampling component 30, including the circuit board 40 in the first aspect.

[0130] The sampling component 30 provided in the embodiment of the present application improves the reliability and safety of the sampling component 30 by adopting the circuit board 40 in the first aspect.

[0131] The embodiment of the third aspect of the present application provides a battery device 100 , including a battery cell 20 and the sampling assembly 30 in the second aspect, wherein a circuit board 40 of the sampling assembly 30 is electrically connected to the battery cell 20 .

[0132] The battery device 100 provided in the embodiment of the present application improves the reliability and safety of the battery device 100 by adopting the sampling component 30 in the second aspect.

[0133] An embodiment of a fourth aspect of the present application provides an electrical device, comprising the battery device 100 in the third aspect.

[0134] The electrical equipment provided in the embodiment of the present application improves the reliability and safety of the electrical equipment by adopting the battery device 100 in the third aspect.

[0135] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A circuit board, characterized in that: include: Base material; A fuse circuit is arranged on the substrate, the fuse circuit includes at least one bending section, the bending section includes a fuse part and a reinforcement part connected to each other, the path length of the fuse part is greater than the path length of the reinforcement part, and the line width of the reinforcement part is greater than the line width of the fuse part.

2. The circuit board according to claim 1, characterized in that The bending section has a turning point, and the reinforcement part is arranged at at least part of the turning point.

3. The circuit board according to claim 1, characterized in that: The safety circuit includes a plurality of bending sections, the plurality of bending sections are connected in sequence, and the reinforcing portion is provided at the connection between adjacent bending sections.

4. The circuit board according to claim 1, characterized in that: The outer contour of the reinforcement portion is a polygonal structure, a circular structure or an elliptical structure.

5. The circuit board according to claim 1, wherein: The reinforcement portion is a continuously extending planar structure.

6. The circuit board according to claim 1, wherein: The fuse part is a linear structure, the line width D1 of the fuse part is 0.12mm-0.2mm, the reinforcement part is a circular structure or an elliptical structure, the diameter R of the reinforcement part of the circular structure is ≥0.7mm, and the length L1 of the short axis of the reinforcement part of the elliptical structure is ≥0.7mm.

7. The circuit board according to claim 1, characterized in that: The fuse part is a linear structure, and the line width D1 of the fuse part is 0.12 mm-0.2 mm. The reinforcement part is a rectangular structure, and the short side dimension D2 of the reinforcement part is greater than or equal to 3D1.

8. The circuit board according to any one of claims 1 to 7, characterized in that: The path length L2 of each section of the fuse portion is ≥1 mm.

9. The circuit board according to any one of claims 1 to 7, characterized in that: The projected area of ​​each section of the fuse portion on the substrate is S1, the projected area of ​​each section of the reinforcement portion on the substrate is S2, and the ratio of S1 to S2 is 1:6-1:

3.

10. The circuit board according to any one of claims 1 to 7, characterized in that: The fuse portion is a straight line or an arc line.

11. The circuit board according to any one of claims 1 to 7, characterized in that: The substrate is a flexible substrate.

12. A sampling assembly, characterized in that: Comprising the circuit board as claimed in any one of claims 1 to 11.

13. A battery device, characterized in that: It comprises a battery cell and the sampling assembly as claimed in claim 12, wherein the circuit board of the sampling assembly is electrically connected to the battery cell.

14. An electrical device, characterized in that: Comprising the battery device as claimed in claim 13.

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