Welding detection device and battery manufacturing equipment

Abstract

The utility model discloses a welding detection device and battery manufacturing equipment. The welding detection device comprises a base plate, a clamping assembly, a measuring lever and a measuring instrument. The clamping assembly is arranged on the base plate and is used for fixing an end cover of the single battery; the measuring lever comprises a hinge seat and a measuring rod, and the measuring rod extends along the first direction and is rotatably connected with the substrate through the hinge seat. The first end of the measuring rod is arranged towards the welding seam of the end cover, and the minimum distance from the first end of the measuring rod to the hinge seat is smaller than the minimum distance from the second end of the measuring rod to the hinge seat. The second end of the measuring rod faces the measuring instrument, and the measuring instrument is used for measuring the moving distance of the second end. According to the welding detection device and the battery manufacturing equipment, the welding firmness of the welding seam position in the battery single body can be detected, and the sealing performance and the operation stability of the battery single body are improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a welding detection device and battery manufacturing equipment. Background Art

[0002] Batteries are widely used in various electronic devices, such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy airplanes, electric toy ships, power tools and energy storage systems, etc.

[0003] At present, how to improve the sealing performance of battery cells and improve the stability of battery cells during operation is also one of the research issues in this field. Utility Model Content

[0004] In view of the above problems, the present application provides a welding detection device and a battery manufacturing equipment, which can detect the welding firmness of the weld position in the battery cell and improve the sealing performance of the battery cell.

[0005] In a first aspect, the present application provides a welding detection device, comprising a substrate, a clamping assembly, a measuring lever and a measuring instrument. The clamping assembly is disposed on the substrate, and the clamping assembly is used to fix the end cover of the battery cell. The measuring lever comprises an articulated seat and a measuring rod, the measuring rod is rotatably connected to the substrate via the articulated seat, and the measuring rod extends along a first direction. The first end of the measuring rod is used to be set toward the weld of the end cover, and the minimum distance from the first end of the measuring rod to the articulated seat is less than the minimum distance from the second end of the measuring rod to the articulated seat. The second end of the measuring rod is set toward the measuring instrument, and the measuring instrument is used to measure the moving distance of the second end.

[0006] In the technical solution of the embodiment of the present application, a substrate is provided to support the clamping assembly, the measuring lever and the measuring instrument, so as to provide a stable measuring surface for the end cap of the battery cell, thereby improving the stability of the measuring process and the accuracy of the measuring result. The clamping assembly is used to clamp the end cap, reduce the displacement of the end cap during the measuring process, and improve the accuracy of the measuring result. In the measuring lever, the first end of the measuring rod moves, rotates around the hinge seat and drives the second end to move. Since the distance between the second end and the hinge seat is large, according to the lever principle, the distance moved by the second end is greater than the distance moved by the first end. The moving distance of the first end is amplified by the above structure to measure the slight thickness change of the end cap weld. Therefore, the welding detection device provided in the embodiment of the present application can improve the accuracy of weld thickness detection, quickly identify products with thickness exceeding the preset value, improve the stability of welding at the explosion-proof valve of the battery cell, reduce the risk of secondary welding products passing the detection, and improve the yield rate of the battery cell. At the same time, the sealing performance and operation stability of the battery cell are improved.

[0007] In some embodiments, the first end of the measuring rod is connected to a measuring portion, the measuring portion is used to abut against the weld of the end cover, and the cross-sectional area of ​​the measuring portion gradually decreases along the direction of the measuring rod toward the substrate. In the above structure, the end of the measuring portion is set to a pointed shape, which can achieve accurate measurement of key nodes and improve the sensitivity of the measurement results.

[0008] In some embodiments, the welding detection device further includes a measuring mounting frame, and the measuring mounting frame includes a support rod and a connecting block. The support rod is provided on the base plate, and the connecting block is connected to the support rod. The connecting block is used to connect the measuring instrument, and the connecting block and the support rod are detachably connected to adjust the distance of the measuring instrument relative to the base plate. In the above structure, by setting the measuring mounting frame, the position of the measuring instrument is fixed, thereby improving the accuracy of the measuring structure. The connecting block is detachably connected to the support rod, and the position of the measuring instrument can be adjusted, so that the measuring instrument can adapt to the measurement of the thickness of the end cover welds of different thicknesses.

[0009] In some embodiments, the welding detection device further comprises a limiter, the limiter is connected to the support rod, and the limiter is arranged between the second end of the measuring lever and the measuring instrument to limit the movement of the second end of the measuring lever relative to the measuring instrument. In the above structure, by setting the limiter, the movement range of the measuring rod is limited, and the excessive movement range of the measuring rod during the measurement process is reduced.

[0010] In some embodiments, the articulated seat includes: a base and a rotating shaft. The base is arranged on the base plate, and the surface of the base facing away from the base plate is concave to form a rotating groove. The rotating shaft is arranged in the rotating groove, and the two ends of the rotating shaft are connected to the groove wall of the rotating groove. The measuring rod is arranged in the rotating groove and is rotatably connected to the rotating shaft. In the above structure, the base is fixedly connected to the base plate, providing a stable connection structure for the rotating shaft and the measuring rod, and the rotating shaft rotatably connects the measuring rod to the base.

[0011] In some embodiments, the clamping assembly includes a support block and a clamping claw. The support block is arranged on the substrate, and the clamping claw is arranged on the side of the support block away from the substrate. One end of the clamping claw extends along the first direction and is suspended outside the support block to form a clamping portion, and a clamping space for the end cap is formed between the clamping portion and the substrate. In the above structure, the clamping claw is connected to the substrate by arranging the support block, and the support block separates the clamping space between the clamping claw and the substrate for accommodating the end cap.

[0012] In some embodiments, the number of the clamping assemblies is two, and the two clamping assemblies are spaced apart along the second direction, and the second direction intersects the first direction. Providing two clamping assemblies improves the balance of the clamping force distribution, reduces the risk of the end cap moving during the measurement process, and improves the accuracy of the measurement.

[0013] In some embodiments, the measuring rod is arranged between the two support blocks. In the above structure, the two support blocks are arranged on both sides of the hinge seat, which improves the clamping stability around the test point during the test process and improves the accuracy of the test result.

[0014] In some embodiments, the clamping assembly further includes a height adjustment block, which is disposed between the clamping jaw and the support block and is used to adjust the height of the clamping space. In the above structure, by providing the height adjustment block, the clamping jaw can adapt to the detection of end caps of various thicknesses, and the applicable scope of the welding detection device.

[0015] In some embodiments, the clamping assembly further includes a positioning plate, which is disposed between the clamping portion and the base plate, and a surface of the positioning plate facing the clamping portion is concave to form a receiving groove, and the shape of the receiving groove matches the shape of the end cap. In the above structure, by providing the positioning plate, the accuracy and efficiency of the end cap positioning are improved.

[0016] In some embodiments, the positioning plate is detachably connected to the base plate. By replacing the positioning plate, the welds of end caps with different structures can be inspected, thereby increasing the applicable scope of the measurement and realizing rapid switching of the measurement object.

[0017] In a second aspect, the present application provides a battery manufacturing device, which includes the welding detection device in the above embodiment.

[0018] 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

[0019] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0020] Figure 1 A schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

[0021] Figure 2 This is a schematic diagram of the structure of a welding detection device according to some embodiments of the present application;

[0022] Figure 3 for Figure 2 A schematic diagram of the enlarged structure of part A;

[0023] Figure 4 Schematic diagram of different states of the measuring process of the measuring lever;

[0024] Figure 5 A schematic diagram of the structure of a measuring unit of a welding detection device according to some embodiments of the present application;

[0025] Figure 6 Schematic diagram of the structure of welding detection devices according to other embodiments of the present application.

[0026] DETAILED DESCRIPTION OF REFERENCE NUMERALS

[0027] 1. Battery cell; 10. Electrode assembly; 20. Shell; 24. Pressure relief mechanism; 25. Electrode terminal; 30. End cover; 40. Shell; X, first direction; Y, second direction; 2. Welding detection device; 201. Base plate; 202. Clamping assembly; 203. Measuring lever; 204. Measuring instrument; 205. Articulated seat; 206. Measuring rod; 207. Measuring part; 208. Measuring mounting frame; 209. Support rod; 210. Connecting block; 211. Limiting part; 212. Base; 213. Support block; 214. Clamping jaw; 215. Height adjustment block; 216. Positioning plate. DETAILED DESCRIPTION

[0028] The following embodiments of the technical solution of the present application will be 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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).

[0034] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0035] 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.

[0036] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can 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 application generally indicates that the associated objects before and after are in an "or" relationship.

[0037] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0038] During the operation of the battery cell, high-temperature gas will be generated, causing the internal gas pressure of the battery cell to increase. If these substances are not discharged in time, the battery cell may burn or explode. In order to discharge the high-temperature and high-pressure substances in the battery cell, a pressure relief mechanism is usually set on the outer shell of the battery cell. When the internal pressure of the battery cell reaches a threshold, it will rupture, release the high-temperature and high-pressure substances, and reduce the pressure inside the battery cell.

[0039] The pressure relief mechanism on the battery cell usually includes a pressure relief piece arranged in the pressure relief hole on the outer shell. The pressure relief piece is provided with a weak portion, which can rupture under a certain pressure. The pressure relief piece is usually connected to the outer shell by welding. However, in the case of a primary welding failure of the pressure relief piece, repair welding can only repair the cracks on its surface, and cannot actually improve the connection strength and sealing performance between the pressure relief piece and the outer shell. In this way, the pressure relief piece that has been welded for the second time is prone to cracking during the operation of the battery cell, resulting in sealing failure. The surface of the weld at the secondary welding position is not significantly different from the weld that was successfully welded once, and cannot be detected by conventional detection agencies.

[0040] According to research, the thickness of the weld that has undergone secondary repair welding is slightly higher than that of the weld that has been successfully welded once. As long as its thickness is measured, unqualified welding products can be accurately screened out. However, the slight difference in weld thickness is still difficult to distinguish with ordinary measuring tools. Based on this, the present application proposes a welding detection device. In the welding detection device, a base plate is provided to support a clamping assembly, a measuring lever, and a measuring instrument, so as to provide a stable measuring surface for the end cover of the battery cell, thereby improving the stability of the measurement process and the accuracy of the measurement results. The clamping assembly is used to clamp the end cover to reduce the displacement of the end cover during the measurement process and improve the accuracy of the measurement results. In the measuring lever, the first end of the measuring rod moves, rotates around the hinge seat and drives the second end to move. Since the distance between the second end and the hinge seat is large, according to the lever principle, the distance moved by the second end is greater than the distance moved by the first end.

[0041] Through the above structure, the moving distance of the first end can be magnified to measure the slight thickness change of the end cover weld. Therefore, the welding detection device provided in the embodiment of the present application can improve the accuracy of weld thickness detection, quickly identify products with thickness exceeding the preset value, improve the stability of welding at the explosion-proof valve of the battery cell, reduce the risk of secondary welding products passing the inspection, and improve the yield rate of the battery cell. At the same time, it reduces the sealing failure caused by insufficient secondary welding strength and improves the stability of battery cell operation.

[0042] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar component.

[0043] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, a battery cell assembly may be a battery module, and a battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, a battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0044] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0045] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0046] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0047] In the embodiment of the present application, the battery cell may be a secondary battery cell, which refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0048] Battery cells may include but are not limited to lithium ion battery cells, sodium ion battery cells, sodium lithium ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium sulfur battery cells, magnesium ion battery cells, nickel metal hydride battery cells, nickel cadmium battery cells, lead storage battery cells, etc.

[0049] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no particular limitation in the present application.

[0050] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0051] In some embodiments, the battery device may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0052] The battery device disclosed in the embodiments 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 device can be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, 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.

[0053] Figure 1 A schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application.

[0054] like Figure 1 As shown, in some embodiments, the battery cell 1 includes a housing 40 and an electrode assembly 10 accommodated in the housing 40 .

[0055] The electrode assembly 10 includes a positive electrode and a negative electrode. During the charge and discharge process of the battery cell 1, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode. Optionally, the electrode assembly 10 also includes a separator disposed between the positive electrode and the negative electrode, which can reduce the risk of short circuit between the positive and negative electrodes while allowing active ions to pass through.

[0056] The housing 40 is used to encapsulate the electrode assembly 10 and the electrolyte and other components. The housing 40 may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing 40 ), or an aluminum-plastic film.

[0057] In some embodiments, the housing 40 includes a shell 20 and an end cover 30 . The shell 20 has an opening, and the end cover 30 is used to cover the opening.

[0058] In some embodiments, the battery cell 1 further includes an electrolyte contained in the housing 40. The electrolyte plays a role in conducting ions between the positive and negative electrodes and can be in liquid, gel or solid state.

[0059] In some embodiments, the battery cell 1 includes an electrode terminal 25 . The electrode terminal 25 is electrically connected to the electrode assembly 10 to output or input electrical energy of the battery cell 1 .

[0060] In some embodiments, the battery cell 1 further includes a pressure relief mechanism 24, and the outer shell 40 is provided with a through hole penetrating in the thickness direction to form a pressure relief hole. The pressure relief mechanism 24 includes a pressure relief sheet provided on the pressure relief hole. The pressure relief sheet can be made of a metal material with a certain structural strength, such as aluminum alloy, stainless steel, etc. The pressure relief sheet has a weak portion, and the thickness of the weak portion is less than the thickness of the pressure relief sheet body, so that when the internal pressure of the battery cell 1 is higher than a preset range, the weak portion can rupture and open the pressure relief hole. Exemplarily, the weak portion can be a groove formed on the pressure relief sheet.

[0061] The pressure relief plate is connected to the housing by welding, and a weld having a thickness slightly greater than that of the pressure relief plate body is formed on the end cover. It is understandable that the more times the welding is performed, the thicker the weld is, and the higher the protrusion height of the weld relative to the pressure relief plate body is. Therefore, it is necessary to measure the highest protruding part to distinguish whether the weld is completed by one welding or multiple welding. In this way, products that have been completed by multiple welding can be eliminated in time to improve the yield rate.

[0062] Please refer to Figures 2 to 3 , Figure 2 This is a schematic diagram of the structure of a welding detection device in some embodiments of the present application. Figure 3 for Figure 2 Schematic diagram of the enlarged structure of part A.

[0063] As shown in the figure, the welding detection device 2 provided in the embodiment of the present application includes a substrate 201, a clamping assembly 202, a measuring lever 203 and a measuring instrument 204. The clamping assembly 202 is arranged on the substrate 201, and the clamping assembly 202 is used to fix the end cover 30 of the battery cell 1. The measuring lever 203 includes an articulated seat 205 and a measuring rod 206, and the measuring rod 206 is rotatably connected to the substrate 201 through the articulated seat 205, and the measuring rod 206 extends along the first direction X. The first end of the measuring rod 206 is used to be set toward the weld of the end cover 30, and the minimum distance from the first end of the measuring rod 206 to the articulated seat 205 is less than the minimum distance from the second end of the measuring rod 206 to the articulated seat 205. The second end of the measuring rod 206 is set toward the measuring instrument 204, and the measuring instrument 204 is used to measure the moving distance of the second end.

[0064] The substrate 201 serves as the supporting base of the entire detection device, and plays the role of supporting the clamping component 202, the measuring lever 203 and the measuring instrument 204. It ensures that all components can maintain a relatively fixed position during the measurement process, thereby minimizing the influence of external factors on the measurement results. This design not only improves the stability of the measurement process, but also improves the accuracy of the measurement results. For example, a metal material, a wooden board or an organic material board with a certain strength can be used to manufacture the substrate 201. The surface of the substrate 201 is a flat dish, and mounting holes are provided at corresponding positions to facilitate the installation of other components.

[0065] The clamping assembly 202 is a key component in the detection device for fixing the end cap 30 of the battery cell 1. Its design fully considers the stability requirements of the end cap 30 during the measurement process, and ensures that the end cap 30 will not shift or deform during the measurement process through precise clamping force and position adjustment.

[0066] Please refer to the reference picture Figures 2 to 4 , using the weld detection device of the present application for detection, can include the following steps, first aligning the first end of the measuring rod 206 with the comparison plate, and observing the reading D1 of the measuring instrument 204 at the second end. Then, the end cover 30 is placed on the base, the position of the weld is aligned with the first end of the measuring rod 206, the first end moves and drives the second end to move, and the reading D2 of the measuring instrument 204 at the second end is observed. The minimum distance from the first end to the articulated seat 205 is L1, and the minimum distance from the second end to the articulated seat 205 is L2.

[0067] After adding the end plate, the moving distance of the second end is B=D2-D1. According to the lever principle, A / L1=B / L2, so the moving distance of the first end relative to the plane state is A=B*L1 / L2=(D2-D1)*L1 / L2.

[0068] The above calculation formula can be used to obtain the moving distance of the first end relative to the surface of the comparison plate, and the thickness of the weld can also be measured.

[0069] It is understandable that the ratio of L2 / L1 can be increased by adjusting the length of the measuring rod 206 and the position of the hinge seat 205, that is, the moving distance of the second end can be amplified, thereby improving the sensitivity of the detection.

[0070] In the technical solution of the embodiment of the present application, a substrate 201 is provided to support the clamping assembly 202, the measuring lever 203 and the measuring instrument 204, so as to provide a stable measuring surface for the end cap 30 of the battery cell 1, thereby improving the stability of the measuring process and the accuracy of the measuring result. The clamping assembly 202 is used to clamp the end cap 30, reduce the displacement of the end cap 30 during the measuring process, and improve the accuracy of the measuring result. In the measuring lever 203, the first end of the measuring rod 206 moves, rotates around the hinge seat 205 and drives the second end to move. Since the distance between the second end and the hinge seat 205 is large, according to the lever principle, the distance moved by the second end is greater than the distance moved by the first end. The moving distance of the first end is amplified by the above structure to measure the slight thickness change of the weld of the end cap 30. Therefore, the welding detection device 2 provided in the embodiment of the present application can improve the accuracy of weld thickness detection, quickly identify products with thickness exceeding the preset value, improve the stability of welding at the explosion-proof valve of the battery cell 1, reduce the risk of secondary welding products passing the detection, and improve the yield rate of the battery cell 1. At the same time, the risk of sealing failure due to insufficient secondary welding strength is reduced, and the operating stability of the battery cell 1 is improved.

[0071] The weld detection device of the embodiment of the present application can be used not only to detect the weld on the end cover 30, but also to measure the thickness of other welding positions, which is not limited here. For example, the thickness of the metal plate can be measured in the processes of cutting, bending, welding, etc. to ensure the processing accuracy and product quality. Or the thickness of the coating or plating that needs to be applied to the surface of the object can be measured. For example, the coating material of the PCB board, the semiconductor film, etc. need to accurately measure their thickness. In the above-mentioned process flow, the weld detection device provided by the embodiment of the present application can be used for detection.

[0072] like Figure 5 As shown, in some embodiments of the present application, the first end of the measuring rod 206 is connected to a measuring portion 207, and the measuring portion 207 is used to abut against the weld of the end cover 30, and the cross-sectional area of ​​the measuring portion 207 gradually decreases along the direction of the measuring rod 206 toward the substrate 201. Exemplarily, the longitudinal section of the measuring portion 207 is an arc or a cone.

[0073] The measuring portion 207 with an arc-shaped longitudinal section can align the arc surface with the measuring point of the weld to reduce measurement errors. The arc-shaped design can also disperse stress during contact to avoid unnecessary damage to the weld.

[0074] The measuring portion 207 with a conical longitudinal section can align the tip with the point to be measured, thereby improving the accuracy and sensitivity of the measurement.

[0075] In the above structure, the end of the measuring part 207 is set to be pointed, which can achieve accurate measurement of key nodes and improve the sensitivity of the measurement result.

[0076] In some embodiments of the present application, the measuring instrument 204 includes at least one of a measuring ruler, a dial indicator, a micrometer, or a laser rangefinder.

[0077] The measuring ruler is one of the most basic and common measuring tools, which is easy to obtain and convenient to read. When the moving distance of the second end is large enough, the measuring ruler can be directly selected for reading. Optionally, the measuring ruler can be used in conjunction with other tools (such as a vernier caliper, a depth gauge, etc.) for more accurate measurement. The measuring instrument 204 can directly read the moving distance of the measuring rod 206, intuitively obtain the data to be measured, and then calculate the actual thickness measured by the measuring part 207 according to the lever principle.

[0078] The dial indicator is a precision measuring tool, which is usually used to measure linear displacement or angle change within a small range. It displays the measurement result by rotating the dial, and has high accuracy and readability. In the measurement of weld node thickness, the dial indicator can be used to measure the slight deformation or displacement of the second end of the measuring rod 206.

[0079] A micrometer is similar to a dial indicator, but is more accurate and is often used to measure smaller displacements. It has a smaller measuring range, but can give readings accurate to one thousandth of a millimeter.

[0080] The laser rangefinder uses a laser beam to perform long-distance measurement. It has the advantages of fast measurement speed, high accuracy, and easy operation. In the measurement of weld node thickness, the laser rangefinder can be used to measure the distance of the second end relative to the substrate 201. By measuring the distance of the second end relative to the substrate 201 before and after the movement, the linear movement distance of the second end can be measured, and then the actual thickness of the weld can be obtained by calculation.

[0081] The measuring instrument 204 can effectively reflect the distance moved by the second end, and the distance moved by the first end can be obtained by calculation, thereby obtaining the actual thickness of the weld.

[0082] like Figure 6 As shown, in some embodiments of the present application, the welding detection device 2 further includes a measuring mounting frame 208, and the measuring mounting frame 208 includes a support rod 209 and a connecting block 210. The support rod 209 is provided on the substrate 201, and the connecting block 210 is connected to the support rod 209. The connecting block 210 is used to connect the measuring instrument 204, and the connecting block 210 and the support rod 209 are detachably connected to adjust the distance between the measuring instrument 204 and the substrate 201.

[0083] The support rod 209 is the main supporting structure of the measuring mounting frame 208, which is fixed on the base plate 201. The support rod 209 can be arranged perpendicular to the surface of the base plate 201. The support rod 209 provides a stable support point for the connecting block 210 and the measuring instrument 204. The connecting block 210 is used to connect the support rod 209 and the measuring instrument 204. The connecting block 210 is provided with a mounting interface matching the support rod 209 to ensure that the connecting block 210 can be firmly mounted on the support rod 209. At the same time, the connecting block 210 is also designed with a connecting interface matching the measuring instrument 204, so that the measuring instrument 204 can be stably mounted on the connecting block 210.

[0084] The connection block 210 and the support rod 209 are connected in a detachable manner, such as a bolt connection, a snap connection, etc. This design allows the connection block 210 to be easily installed on the support rod 209, and can also be easily removed as needed. By adjusting the position of the connection block 210 on the support rod 209, the height of the measuring instrument 204 relative to the base plate 201 can be flexibly adjusted to meet the measurement requirements of the welds of the end caps 30 with different thicknesses.

[0085] In the above structure, the position of the measuring instrument 204 is fixed by setting the measuring mounting frame 208, thereby improving the accuracy of the measuring structure. The connecting block 210 is detachably connected to the support rod 209, and the position of the measuring instrument 204 can be adjusted, so that the measuring instrument 204 can adapt to the measurement of the weld thickness of the end cover 30 with different thicknesses.

[0086] In some embodiments of the present application, the welding detection device 2 also includes a limit portion 211, which is connected to the support rod 209 and is disposed between the second end of the measuring lever 203 and the measuring instrument 204 to limit the movement of the second end of the measuring lever 203 relative to the measuring instrument 204.

[0087] By limiting the range of movement of the measuring lever 203, the limiter 211 helps to reduce the measurement error caused by the shaking or tilting of the measuring lever 203. This enables the measuring instrument 204 to capture the slight changes of the weld more accurately, thereby improving the accuracy and reliability of the measurement. In addition, the existence of the limiter 211 provides an additional support point for the measuring lever 203, thereby enhancing the stability of the entire measuring device. During the measurement process, even if encountering a large external force interference, the limiter 211 can also keep the measuring lever 203 relatively stable, ensuring the accuracy of the measurement result. During the measurement process or the process of replacing the end plate, the second end of the measuring lever 203 may hit the measuring instrument 204 due to excessive movement, resulting in damage to the measuring instrument 204 or increased measurement errors. The setting of the limiter 211 effectively avoids the occurrence of this situation and protects the measuring instrument 204 from damage.

[0088] In the above structure, the limit portion 211 is provided to limit the moving range of the measuring rod 206, thereby reducing the excessive moving range of the measuring rod 206 during the measuring process.

[0089] In some embodiments of the present application, the articulated seat 205 includes: a base 212 and a rotating shaft. The base 212 is disposed on the substrate 201, and the surface of the base 212 facing away from the substrate 201 is concave to form a rotating groove. The rotating shaft is disposed in the rotating groove, and both ends of the rotating shaft are connected to the groove wall of the rotating groove. Among them, the measuring rod 206 is disposed in the rotating groove and is rotatably connected to the rotating shaft.

[0090] The base 212 is the main supporting structure of the articulated seat 205. It is fixedly connected to the base plate 201. The surface of the base 212 facing away from the base plate 201 is concave to form a rotation groove. This rotation groove provides a storage space for the rotating shaft and the measuring rod 206 and ensures the relative position relationship between them. The rotating shaft is arranged in the rotation groove, and its two ends are connected to the groove wall of the rotating groove. The function of the rotating shaft is to provide a rotatable connection point for the measuring rod 206, so that the measuring rod 206 can rotate relative to the base 212 within a certain range. The measuring rod 206 is arranged in the rotation groove and is rotatably connected to the rotating shaft. One end of the measuring rod 206 is usually in contact with the weld and is used to measure the thickness of the weld. Since the measuring rod 206 is rotatably connected to the rotating shaft, the measuring rod 206 can be flexibly adjusted according to the shape and position of the weld to ensure the accuracy of the measurement.

[0091] In the above structure, the base 212 is fixedly connected to the base plate 201 , providing a stable connection structure for the rotating shaft and the measuring rod 206 , and the rotating shaft rotatably connects the measuring rod 206 and the base 212 .

[0092] In some embodiments of the present application, the clamping assembly 202 includes a support block 213 and a clamping jaw 214. The support block 213 is disposed on the substrate 201, and the clamping jaw 214 is disposed on a side of the support block 213 away from the substrate 201. One end of the clamping jaw 214 extends along the first direction X and is suspended outside the support block 213 to form a clamping portion, and a clamping space for the end cover 30 is formed between the clamping portion and the substrate 201.

[0093] The support block 213 is the main support structure of the clamping assembly 202, and it is fixedly connected to the substrate 201. The function of the support block 213 is to provide a stable support point for the clamping jaw 214, so that the clamping jaw 214 can firmly clamp the end cover 30. The clamping jaw 214 is arranged on the side of the support block 213 away from the substrate 201, and its design usually has a certain elasticity or adjustability. One end of the clamping jaw 214 extends along the first direction X and is suspended outside the support block 213 to form a clamping portion. This clamping portion is the part of the clamping assembly 202 that is in direct contact with the end cover 30, and is used to clamp and fix the end cover 30. The clamping jaw 214 can be made of a material with a certain strength and elasticity. By adjusting the opening degree or position of the clamping jaw 214, end covers 30 of different sizes can be easily clamped, thereby improving the versatility and flexibility of the clamping assembly 202.

[0094] In the above structure, the clamping jaw 214 is connected to the substrate 201 by providing the support block 213 , and the support block 213 provides a clamping space between the clamping jaw 214 and the substrate 201 for accommodating the end cover 30 .

[0095] In some embodiments of the present application, the measuring rod 206 extends along the first direction X, the number of the clamping assemblies 202 is two, and the two clamping assemblies 202 are arranged at intervals along the second direction Y, and the second direction Y intersects with the first direction X. By providing two clamping assemblies 202, stable clamping of the end cap 30 in multiple directions can be achieved. This design helps to disperse the clamping force and avoid excessive pressure on a single clamping point, resulting in unstable clamping or damage to the end cap 30. The two clamping assemblies 202 are arranged at intervals along the second direction Y (the direction intersecting with the first direction X), forming a multi-directional clamping of the end cap 30. This layout helps to ensure that the end cap 30 does not move or tilt during the measurement process, thereby improving the accuracy and stability of the measurement.

[0096] The two clamping assemblies 202 are provided to improve the balance of the clamping force distribution, reduce the risk of the end cover 30 moving during the measurement process, and improve the accuracy of the measurement.

[0097] In some embodiments of the present application, the measuring rod 206 is disposed between two support blocks 213. By arranging the support blocks 213 on both sides of the articulated seat 205, the existence of the two support blocks 213 provides additional support points for the articulated seat 205, enhances the stability of the entire clamping structure, and is able to resist various external interferences and vibrations that may be generated during the test, ensuring the smooth progress of the test and the accuracy of the results.

[0098] In the above structure, two support blocks 213 are arranged on both sides of the hinge seat 205, which improves the clamping stability around the test point during the test process and improves the accuracy of the test result.

[0099] In some embodiments of the present application, the clamping assembly 202 further includes a height adjustment block 215 , which is disposed between the clamping jaw 214 and the support block 213 and is used to adjust the height of the clamping space.

[0100] The height adjustment block 215 is cleverly arranged between the clamping jaw 214 and the support block 213, and plays a role of connection and adjustment. It is usually connected to the clamping jaw 214 and the support block 213 in a stable and adjustable manner through a threaded connection, a sliding connection or other adjustable connection methods. The main function of the height adjustment block 215 is to adjust the height of the clamping space to adapt to end caps 30 of different thicknesses. By rotating or moving the height adjustment block 215, the height of the clamping jaw 214 relative to the support block 213 can be easily changed, thereby adjusting the size of the clamping space.

[0101] The presence of the height adjustment block 215 enables the clamping assembly 202 to easily adapt to end caps 30 of different thicknesses without having to replace the jaws 214 or make complicated adjustments. The quick adjustment function of the height adjustment block 215 enables the clamping assembly 202 to quickly adapt to end caps 30 of different thicknesses, thereby reducing the time required to replace the jaws 214 or adjust the equipment. The precise adjustment function of the height adjustment block 215 enables the height of the clamping space to be precisely controlled, thereby ensuring stable clamping of the end cap 30 during the inspection process.

[0102] In the above structure, by providing the height adjustment block 215 , the clamping jaw 214 can adapt to the detection of end covers 30 of various different thicknesses, thereby expanding the applicable scope of the welding detection device 2 .

[0103] In some embodiments of the present application, the clamping assembly 202 also includes a positioning plate 216, which is disposed between the clamping portion and the substrate 201. A surface of the positioning plate 216 facing the clamping portion is concave to form a receiving groove, and the shape of the receiving groove matches the shape of the end cover 30.

[0104] The receiving groove on the positioning plate 216 matches the shape of the end cap 30, ensuring the accurate positioning of the end cap 30 during the clamping process. This design reduces the measurement errors and welding defects caused by inaccurate positioning, and improves the quality and reliability of the product. The presence of the positioning plate 216 enables the end cap 30 to quickly find the correct position when it is placed in the clamping space without the need for cumbersome adjustments and calibrations. This helps to improve detection efficiency, shorten the detection cycle, and reduce production costs. The positioning plate 216 not only plays a positioning role, but also can enhance the stability of the clamping to a certain extent. When the end cap 30 is clamped in the receiving groove, the positioning plate 216 can provide additional support and restriction to prevent the end cap 30 from moving or tilting during measurement or welding. By designing receiving grooves of different shapes, the positioning plate 216 can adapt to end caps 30 of different shapes and sizes. This design makes the clamping assembly 202 more versatile and flexible, and can cope with more types of detection tasks.

[0105] In the above structure, by providing the positioning plate 216, the accuracy and efficiency of positioning the end cover 30 are improved.

[0106] Optionally, the receiving groove on the positioning plate 216 may also be designed to be in a shape matching the component to be measured, so as to accommodate the measurement of different components.

[0107] In some embodiments of the present application, the positioning plate 216 is detachably connected to the base plate 201. For example, the positioning plate 216 can be detachably connected to the base plate 201 by bolt connection, riveting, etc. By replacing the positioning plate 216, the welds of the end caps 30 of different structures can be inspected, which increases the applicable scope of the measurement and realizes the rapid switching of the measurement object.

[0108] In some optional embodiments, the welding detection device 2 includes a substrate 201, a clamping assembly 202, a measuring lever 203 and a measuring instrument 204. The clamping assembly 202 is arranged on the substrate 201, and the clamping assembly 202 is used to fix the end cover 30 of the battery cell 1. The measuring lever 203 includes an articulated seat 205 and a measuring rod 206, and the measuring rod 206 is rotatably connected to the substrate 201 through the articulated seat 205, and the measuring rod 206 extends along the first direction X. The first end of the measuring rod 206 is used to be set toward the weld of the end cover 30, and the minimum distance from the first end of the measuring rod 206 to the articulated seat 205 is less than the minimum distance from the second end of the measuring rod 206 to the articulated seat 205. The second end of the measuring rod 206 is set toward the measuring instrument 204, and the measuring instrument 204 is used to measure the moving distance of the second end. The measuring instrument 204 is a dial indicator. The first end of the measuring rod 206 is connected to a measuring portion 207, which is used to abut against the weld of the end cover 30. The cross-sectional area of ​​the measuring portion 207 gradually decreases along the direction from the measuring rod 206 to the substrate 201. The clamping assembly 202 includes a support block 213 and a clamping jaw 214. The support block 213 is arranged on the substrate 201, and the clamping jaw 214 is arranged on the side of the support block 213 away from the substrate 201. One end of the clamping jaw 214 extends along the first direction X and is suspended outside the support block 213 to form a clamping portion, and a clamping space for the end cover 30 is formed between the clamping portion and the substrate 201. The clamping assembly 202 also includes a positioning plate 216, which is arranged between the clamping portion and the substrate 201. The surface of one side of the positioning plate 216 facing the clamping portion is concave to form a receiving groove, and the shape of the receiving groove matches the shape of the end cover 30.

[0109] The embodiment of the present application also provides a battery manufacturing device, which includes the welding detection device 2 in the above embodiment. By setting a substrate 201 for supporting the clamping assembly 202, the measuring lever 203 and the measuring instrument 204, a stable measuring surface is provided for the end cover 30 of the battery cell 1, thereby improving the stability of the measurement process and the accuracy of the measurement result. The clamping assembly 202 is used to clamp the end cover 30, reduce the displacement of the end cover 30 during the measurement process, and improve the accuracy of the measurement result. In the measuring lever 203, the first end of the measuring rod 206 moves, rotates around the hinge seat 205 and drives the second end to move. Since the distance between the second end and the hinge seat 205 is large, according to the lever principle, the distance moved by the second end is greater than the distance moved by the first end. The moving distance of the first end is amplified by the above structure to measure the slight thickness change of the weld of the end cover 30. Therefore, the welding detection device 2 provided in the embodiment of the present application can improve the accuracy of weld thickness detection, quickly identify products with thickness exceeding a preset value, improve the stability of welding at the explosion-proof valve of the battery cell 1, reduce the risk of secondary welding products passing the detection, and improve the yield rate of the battery cell 1. At the same time, the risk of sealing failure caused by insufficient secondary welding strength is reduced, and the stability of the operation of the battery cell 1 is improved.

[0110] Finally, it should be noted that 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A welding detection device, characterized in that: include: substrate; A clamping assembly, provided on the substrate, and used to fix the end cover of the battery cell; A measuring lever, comprising an articulated seat and a measuring rod, wherein the measuring rod extends in a first direction, the measuring rod is rotatably connected to the base plate through the articulated seat, the first end of the measuring rod is used to be arranged toward the weld of the end cover, and the minimum distance from the first end of the measuring rod to the articulated seat is smaller than the minimum distance from the second end of the measuring rod to the articulated seat; A measuring instrument, wherein the second end of the measuring rod is arranged toward the measuring instrument, and the measuring instrument is used to measure the moving distance of the second end.

2. The welding detection device according to claim 1, characterized in that: A measuring portion is connected to the first end of the measuring rod, and the measuring portion is used to abut against the welding seam of the end cover. The cross-sectional area of ​​the measuring portion gradually decreases along the direction of the measuring rod toward the substrate.

3. The welding detection device according to claim 1, characterized in that: The welding detection device further comprises a measuring mounting frame, wherein the measuring mounting frame comprises: A support rod, disposed on the base plate; A connecting block is connected to the support rod, and is used to connect the measuring instrument. The connecting block and the support rod are detachably connected to adjust the distance between the measuring instrument and the substrate.

4. The welding detection device according to claim 3, characterized in that: The welding detection device further comprises a limit portion, which is connected to the support rod and is arranged between the second end of the measuring lever and the measuring instrument to limit the second end of the measuring lever from moving relative to the measuring instrument.

5. The welding detection device according to claim 3, characterized in that: The hinged seat comprises: A base is arranged on the substrate, and a surface of the base facing away from the substrate is concave to form a rotation groove; A rotating shaft is arranged in the rotating groove, and both ends of the rotating shaft are connected to the groove wall of the rotating groove. Wherein, the measuring rod is arranged in the rotating groove and is rotatably connected to the rotating shaft.

6. The welding detection device according to any one of claims 1 to 5, characterized in that: The clamping assembly comprises: A support block, disposed on the substrate; A clamping claw is arranged on a side of the support block away from the substrate, one end of the clamping claw extends along the first direction and is suspended outside the support block to form a clamping portion, and a clamping space for an end cover is formed between the clamping portion and the substrate.

7. The welding detection device according to claim 6, characterized in that: The number of the clamping assemblies is two, and the two clamping assemblies are arranged at intervals along a second direction, and the second direction intersects with the first direction.

8. The welding detection device according to claim 7, characterized in that: The measuring rod is arranged between the two supporting blocks.

9. The welding detection device according to claim 6, characterized in that: The clamping assembly further comprises a height adjustment block, which is arranged between the clamping jaws and the supporting block and is used for adjusting the height of the clamping space.

10. The welding detection device according to claim 6, characterized in that: The clamping assembly further includes a positioning plate, which is disposed between the clamping portion and the base plate. A surface of one side of the positioning plate facing the clamping portion is concave to form a receiving groove, and a shape of the receiving groove matches the shape of the end cover.

11. The welding detection device according to claim 10, characterized in that: The positioning plate is detachably connected to the base plate.

12. A battery manufacturing device, characterized in that: It comprises a welding detection device as claimed in any one of claims 1 to 11.

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