Detection device

Abstract

The utility model relates to the technical field of battery detection, and discloses a detection device used for detecting a diaphragm. The device comprises an unwinding roller, a winding roller, a clamping mechanism and a power source, the clamping mechanism comprises a detection assembly and a driving assembly, the detection assembly is arranged on the downstream side of the unwinding roller and located on the upstream side of the winding roller, the detection assembly comprises at least one pair of conductive parts and a temperature detector, and each pair of conductive parts is used for clamping a diaphragm; the two conductive parts in each pair of conductive parts are oppositely arranged along a first direction; any conductive part in each pair of conductive parts is connected with the positive electrode of the power supply, the other conductive part is connected with the negative electrode of the power supply, the temperature detector is used for detecting temperature distribution of the conductive parts in the clamping state, and the driving assembly is in driving connection with at least one conductive part in each pair. According to the method and the device, the diaphragm failure point which is not easy to be visually found can be converted into the heating point which is easy to detect, the failure point on the diaphragm can be quickly and accurately positioned, and the searching efficiency and the searching accuracy of the diaphragm failure point are improved.

Description

Technical Field

[0001] This application relates to the field of battery testing technology, and in particular to testing devices. Background Technology

[0002] New energy batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with batteries are already widely used. In addition, batteries are being used more and more in the field of energy storage.

[0003] A separator is placed between the positive and negative electrodes of a battery cell to prevent direct contact between them. In some scenarios, the separator may experience insulation failure in certain areas, leading to battery self-discharge. Therefore, identifying the failure points of the separator is one of the research topics in the industry. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides a detection device.

[0005] This application is achieved through the following technical solution.

[0006] This application provides a detection device for detecting a diaphragm. The detection device includes an unwinding roller, a winding roller, a clamping mechanism, and a power supply. The winding roller is disposed downstream of the unwinding roller and is configured to convey the diaphragm to the winding roller. The clamping mechanism includes a detection component and a driving component. The detection component is disposed downstream of the unwinding roller and upstream of the winding roller. The detection component includes at least one pair of conductive elements and a temperature detector. Each pair of conductive elements is used to clamp the diaphragm. Two of the conductive elements in each pair are arranged opposite to each other along a first direction. One of the conductive elements in each pair is connected to the positive terminal of the power supply, and the other is connected to the negative terminal of the power supply. The driving component is drivenly connected to at least one of the conductive elements in each pair. The driving component is used to drive the conductive elements disposed on both sides of the diaphragm to move closer or further away from each other. The temperature detector is used to detect the temperature distribution of the conductive elements in the clamped state.

[0007] In the technical solution of this application embodiment, since the paired conductive elements can clamp / release the diaphragm and apply voltage, the failure point (short circuit point) of the diaphragm forms a path to generate current and heat, and the temperature distribution of the conductive elements is detected by a temperature detector, the failure point on the diaphragm can be quickly and accurately located by using the current heating effect, thereby improving the accuracy of diaphragm detection and accelerating the detection efficiency.

[0008] In some embodiments, each pair of conductive elements includes a first conductive element and a second conductive element. The first conductive element has a first conductive surface, and the second conductive element has a second conductive surface. The first conductive surface and the second conductive surface are disposed opposite to each other along the first direction. In the clamping state, the first conductive surface and the second conductive surface are respectively attached to both sides of the diaphragm along the first direction.

[0009] In the technical solution of this application embodiment, a surface contact is formed between the conductive component and the diaphragm in the clamping state; a larger detection area can be covered in a single clamping, making it easier to find more failure points and reduce missed detections caused by contact blind spots. At the same time, the larger contact area also makes the clamping more stable.

[0010] In some embodiments, the projection is directed along the first direction onto a projection surface perpendicular to the first direction, and the projection of the first conductive surface at least partially overlaps with the projection of the second conductive surface, wherein the temperature detector is used to detect the overlapping portion of the projections.

[0011] In the technical solution of this application embodiment, a current path perpendicular to the diaphragm is formed between the two conductive surfaces. The current is concentrated at the short-circuit point and generates a thermal effect. The temperature detector locks the short-circuit point location by detecting the overlapping part, reducing the risk of missed detection due to failure points in the non-overlapping area. Furthermore, the shape or coverage area of ​​the projected overlapping part can be adjusted to focus on detecting the area on the diaphragm most likely to experience a short circuit, improving detection accuracy.

[0012] In some embodiments, the conductive element is made of a metal plate, the resistivity of the first conductive element is not less than the resistivity of the second conductive element, and the temperature detector is used to detect the temperature distribution of the first conductive element in a clamped state.

[0013] In the technical solution of this application embodiment, since the first conductive element generates significant heat when current passes through it, the heat generated at the failure point is more easily detected. Therefore, the temperature detector can more sensitively capture the heat generated at the failure point, enhancing the detection effect. In addition, the metal plate structure has good stability and moderate conductivity and thermal conductivity, allowing the heat generated at the failure point to be quickly transferred, shortening the response time of the temperature detector.

[0014] In some embodiments, along the second direction, the size of the first conductive surface is not less than the size of the diaphragm, the size of the second conductive surface is not less than the size of the diaphragm, and the second direction is the width direction of the diaphragm.

[0015] In the technical solution of this application embodiment, since the dimensions of the first conductive surface and the second conductive surface are not less than the width dimension of the diaphragm, the conductive surface can cover the entire width of the diaphragm, eliminating the blind zone in the width direction. This allows failure points throughout the entire width of the diaphragm to be clamped and detected, avoiding missed detections. Furthermore, during continuous clamping and detection, there is no need to adjust the diaphragm's width direction position, shortening the clamping and detection time.

[0016] In some embodiments, the detection device includes a tensioning component, with at least one tensioning component disposed on both the upstream and downstream sides of the detection component, the tensioning component being used to tension the diaphragm.

[0017] In the technical solution of this application embodiment, since tensioning components are provided upstream and downstream of the detection component, the flatness and stability of the diaphragm can be improved, the diaphragm can be kept in a tensioned state during the detection process, and the diaphragm loosening or wrinkling can be avoided from affecting the detection accuracy. This is conducive to the conductive component forming good contact with the diaphragm and improving the detection accuracy.

[0018] In some embodiments, the detection device includes a controller connected to the power supply for controlling the power supply to synchronously supply power to the drive assembly, the tensioning assembly, the unwinding roll, and the take-up roll.

[0019] In the technical solution of this application embodiment, since the controller controls the power supply to the drive component, tension component, unwinding roller and winding roller to supply power synchronously, it can coordinate the synchronous operation of each component, realize the automated synchronous control of the detection process, improve the overall operation efficiency, and also avoid the risk of diaphragm stretching, loosening or deformation caused by asynchrony.

[0020] In some embodiments, the voltage across the two poles of the power supply is no greater than 220V, and the clamping state lasts for 10-15 seconds.

[0021] In the technical solution of this application embodiment, since the voltage and clamping time are within a suitable range, energy consumption and detection accuracy can be balanced. This avoids insufficient heating of the failure point due to excessively short clamping time, which would prevent the temperature detector from capturing the temperature difference. Conversely, excessively long clamping time would result in an excessively large area of ​​the captured heating zone, reducing positioning accuracy.

[0022] In some embodiments, the temperature detector includes at least one of an infrared sensor, an infrared thermal imager, and an infrared scanning thermometer.

[0023] In the technical solution of this application embodiment, since infrared radiation temperature detection method is selected, it is possible to scan and detect temperature distribution quickly and non-contactly, thereby improving detection speed and accuracy of capturing heat points. In addition, it also has the advantages of strong environmental anti-interference and fast response speed.

[0024] In some embodiments, the detection device includes a mounting plate, and the unwinding roller, the winding roller, the clamping mechanism, and the power supply are all connected to the mounting plate.

[0025] In the technical solution of this application embodiment, since the unwinding roller, the winding roller, the clamping mechanism and the power supply are all connected to the mounting plate, the mounting plate can provide a stable support structure, improve the accuracy of the relative positions of each component, and improve the integration and space utilization of the detection device.

[0026] This application utilizes the thermal effect of electric current to transform membrane failure points that are not easily detected by vision into easily detectable heat points, enabling rapid and accurate location of failure points on the membrane, thus improving the efficiency and accuracy of finding membrane failure points.

[0027] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0028] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0029] Figure 1 This is a schematic diagram of the structure of a detection device provided for some embodiments of this application.

[0030] The annotations in the attached figures are explained as follows:

[0031] 100. Detection device; 200. Diaphragm; 10. Clamping mechanism; 11. Detection component; 12. Drive component; 1. First conductive element; 1a. First conductive surface; 2. Second conductive element; 2a. Second conductive surface; 20. Unwinding roller; 30. Rewinding roller; 40. Tensioning component; 50. Temperature detector; 60. Power supply; 70. Controller; 80. Mounting plate. Detailed Implementation

[0032] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms “comprising” and “having”, and any variations thereof, in this document and the foregoing description of the accompanying drawings are intended to cover non-exclusive inclusion.

[0034] In the description of the embodiments of this application, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0035] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0036] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0037] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0038] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0039] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0040] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms "parallel" and "perpendicular" are both allowed to have a certain degree of tolerance and / or error, including cases of being approximately parallel and approximately perpendicular.

[0041] The following is a detailed description of this application.

[0042] Currently, new energy batteries are being used more and more widely in daily life and industry. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0043] In some scenarios, batteries exhibit self-discharge issues, usually due to insulation failure in certain areas of the separator leading to an internal short circuit. Therefore, it is necessary to remove the separator from the battery and locate the failure point. How to efficiently locate the failure point of the separator is one of the research topics in the industry.

[0044] Through research and design, the diaphragm is clamped and energized on both sides, turning the insulation failure point of the diaphragm into an energized heating point. Then, a temperature detector is used to detect the location of the heating point, so as to quickly and accurately determine the insulation failure point.

[0045] Based on this design concept, this application presents a detection device for detecting a diaphragm. The detection device includes an unwinding roller, a winding roller, a clamping mechanism, and a power supply. The winding roller is located downstream of the unwinding roller and is configured to convey the diaphragm to the winding roller. The clamping mechanism includes a detection component and a driving component. The detection component is located downstream of the unwinding roller and upstream of the winding roller. The detection component includes at least one pair of conductive elements and a temperature detector. Each pair of conductive elements is used to clamp the diaphragm, and two of the conductive elements in each pair are arranged opposite each other along a first direction. One of the conductive elements in each pair is connected to the positive terminal of the power supply, and the other is connected to the negative terminal of the power supply. The driving component is drivenly connected to at least one conductive element in each pair and is used to drive the conductive elements located on both sides of the diaphragm to move closer or further apart. The temperature detector is used to detect the temperature distribution of the conductive elements in the clamped state.

[0046] Since the paired conductive parts can clamp the diaphragm and apply voltage, the insulation failure point of the diaphragm forms a circuit to generate current and heat. The temperature distribution of the conductive parts can be detected by a temperature detector. Therefore, the failure point on the diaphragm can be located quickly and accurately by using the current heating effect, which improves the accuracy of diaphragm detection and speeds up the detection efficiency.

[0047] In the embodiments of this application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0048] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0049] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0050] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0051] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0052] As an example, the separator includes a diaphragm, which is a microporous membrane with a microporous structure that prevents short circuits caused by contact between the positive and negative electrodes while allowing electrolyte ions to pass through.

[0053] Below, refer to Figure 1Some embodiments of this application will be described in detail.

[0054] Figure 1 This is a schematic diagram of the structure of a detection device provided for some embodiments of this application.

[0055] In some embodiments of this application, for ease of explanation, a first direction, a second direction, and a third direction are defined. These directions intersect each other; here, intersecting includes perpendicularly intersecting each other. For ease of understanding of the embodiments of this application, in... Figure 1 In the illustrated embodiments, the first direction, the second direction, and the third direction are given as examples where they intersect each other perpendicularly. However, those skilled in the art should understand that the embodiments of this application are not limited to the case where these three directions intersect each other perpendicularly. For ease of explanation, as follows... Figure 1 As shown by the arrows, the direction of arrow Z is the first direction, the direction of arrow Y is the second direction, and the direction of arrow X is the third direction. Sometimes, the direction that arrow Z points to along the third direction is called "up," and its opposite direction is called "down."

[0056] A first aspect of this application provides a detection device 100 for detecting a diaphragm 200. In the embodiments of this application, the detection device 100 includes an unwinding roller 20, a take-up roller 30, a clamping mechanism 10, and a power supply 60. The take-up roller 30 is disposed downstream of the unwinding roller 20, and the unwinding roller 20 is configured to convey the diaphragm 200 to the take-up roller 30. The clamping mechanism 10 includes a detection component 11 and a drive component 12. The detection component 11 is disposed downstream of the unwinding roller 20 and upstream of the take-up roller 30. The detection component 11 includes at least one pair of conductive elements and a temperature detector 50. Each pair of conductive elements is used to clamp the diaphragm 200. Two conductive elements in each pair are arranged opposite each other along a first direction (Z). One conductive element in each pair is connected to the positive terminal of the power supply 60, and the other is connected to the negative terminal of the power supply 60. The drive component 12 is driven to at least one conductive element in each pair. The drive component 12 is used to drive the conductive elements disposed on both sides of the diaphragm 200 to move closer or further away from each other. The temperature detector 50 is used to detect the temperature distribution of the conductive elements in the clamping state.

[0057] It should be noted that the separator 200 is an insulating material. A failure point in the separator 200 refers to a short circuit (failure point) formed on the separator 200 as metal ions grow from one side to the other, essentially embedding a conductor within the insulating material. This causes a short circuit between the positive and negative electrodes of the battery, creating a risk of self-discharge.

[0058] It should be noted that the separator 200 in this application embodiment can be an unwound separator 200 or a separator 200 taken out from a self-discharge battery.

[0059] In the following specific embodiments, a separator 200 with insulation failure points taken from a self-discharge battery is used as an example.

[0060] Understandably, the unwinding roller 20 is the starting end of the unwinding of the diaphragm 200. It is used to carry and release the rolled diaphragm 200 to be tested. During operation, the roller body is driven to rotate by the drive shaft, so as to smoothly transport the rolled diaphragm 200 to the downstream testing area.

[0061] Understandably, the take-up roller 30 is the end point of the unwinding of the diaphragm 200. It is a transmission component used to house the tested diaphragm 200 and, together with the unwind roller 20, forms a continuous conveying system. The take-up roller 30 is driven by a motor and is used to pull and wind the tested diaphragm 200.

[0062] Optionally, the unwinding roller 20 and the take-up roller 30 are synchronously controlled by the power supply 60 or the controller 70, so that they rotate and stop simultaneously.

[0063] It is understandable that the unwinding roller 20 and the take-up roller 30 rotate in the same direction during the conveying process of the diaphragm 200.

[0064] It is understandable that diaphragm 200 conveying refers to the continuous or step-by-step motion process in which diaphragm 200 starts from unwinding roller 20, passes through detection area, and is finally collected by winding roller 30.

[0065] Understandably, the diaphragm 200 conveyor can transport the diaphragm 200 from the upstream unwinding roll 20 to the downstream take-up roll 30, such as... Figure 1 As shown, along the third direction (X), the diaphragm 200 passes the location of the detection component 11 during transport.

[0066] For example, a certain length of PE film (polyethylene film) can be attached to the unwinding position of the diaphragm 200, the length of which is the distance between the unwinding roller 20 and the take-up roller 30. This allows all parts of the diaphragm 200 to be clamped and detected.

[0067] Optionally, the lengths of the unwinding roller 20 and the take-up roller 30 are not less than the width of the diaphragm 200.

[0068] Optionally, the unwinding roller 20 and the take-up roller 30 may be equipped with a web-correcting assembly to ensure that the diaphragm 200 is always conveyed along the centerline of the roller body.

[0069] It is understandable that conductive components refer to parts used to form electrical contact with both sides of the diaphragm 200.

[0070] For example, the conductive elements are arranged in pairs. It will be understood that each pair of conductive elements includes two conductive elements.

[0071] Optionally, the conductive elements of the detection component 11 may be provided in one, two, three or more pairs.

[0072] Understandably, in the clamped state, the conductive component contacts both sides of the diaphragm 200 to form a current loop, which conducts the current output from the power supply 60 to the diaphragm 200, causing the short circuit point inside the diaphragm 200, i.e. the insulation failure point, to become conductive and generate a thermal effect.

[0073] Optionally, the conductive component and the diaphragm 200 have a certain contact area, and the two are in surface contact when clamped.

[0074] Alternatively, the conductive component can be made of metal plate, such as copper plate, aluminum plate or stainless steel plate, to ensure good conductivity and mechanical strength.

[0075] Alternatively, the conductive element may be a metal layer or conductive coating plated or pasted on an insulating substrate.

[0076] Optionally, a conductive buffer layer, such as a conductive silicone layer, can be provided on the contact surface of the conductive component to buffer the clamping pressure and prevent the metal conductive component from directly contacting and scratching the diaphragm 200, thus affecting the test results.

[0077] Optionally, when viewed along the first direction (Z), the shape of the conductive element can be circular, elliptical, triangular, rectangular or other polygonal.

[0078] Alternatively, when viewed along the first direction (Z), the shape of the conductive element can also be irregular, and this application does not limit this.

[0079] Understandably, conductive components integrate conductivity and pressure application functions, possessing a certain degree of rigidity and conductivity. They can not only achieve physical clamping and fixation but also provide electrical connections at failure points.

[0080] Optionally, each conductive component can be integrated or assembled separately. For example, a conductive component may include multiple sub-conductive components, which are arranged in a certain shape.

[0081] It is understood that in each pair of conductive elements, the conductive elements are respectively disposed on both sides of the diaphragm 200 along the first direction (Z), which is the thickness direction of the diaphragm 200; the two poles of the power supply 60 are respectively connected to the conductive elements disposed on both sides of the diaphragm 200.

[0082] Optionally, each conductive component may have the same size, shape, and material, or it may have different sizes, shapes, and materials.

[0083] It is understandable that clamping refers to the action of two conductive components moving relative to each other along the thickness direction of the diaphragm 200 until they are in contact with the two sides of the diaphragm 200; being in a clamping state means that the diaphragm 200 and the conductive components are relatively stationary.

[0084] Optionally, the conductive element can apply a certain preset pressure to the diaphragm 200 when it is clamped, which helps to eliminate the gap between the conductive element and the diaphragm 200, so that the current can form a loop through the short circuit point inside the diaphragm 200.

[0085] It is understandable that, in the clamped state, the failure point is electrically connected to the conductive component and the power supply 60, forming a circuit.

[0086] Optionally, the clamping pressure can be adaptively adjusted according to the thickness of the diaphragm 200. This application does not limit this aspect.

[0087] For example, the clamping action needs to be synchronized with the conveying of the diaphragm 200. The diaphragm 200 stops conveying while it is clamped and resumes conveying after the clamp is released.

[0088] It should be noted that the temperature detector 50 is a device capable of measuring the surface temperature distribution of the diaphragm 200 and / or conductive components.

[0089] For example, the temperature detector 50 may be an infrared sensor that uses infrared radiation to measure temperature, including infrared point sensors, infrared linear array sensors, etc.

[0090] In the technical solution of this application embodiment, since the paired conductive elements can clamp the diaphragm 200 and apply voltage, the failure point (short circuit point) of the diaphragm 200 forms a path to generate current and heat, and the temperature distribution of the conductive elements is detected by the temperature detector 50, the failure point on the diaphragm 200 can be quickly and accurately located by the current heating effect, thereby improving the detection accuracy of the diaphragm 200 and accelerating the detection efficiency.

[0091] Understandably, the drive assembly 12 is a power component used to move the two conductive elements closer to each other (to achieve clamping / releasing), and it can provide stable clamping pressure, which is conducive to reliable contact between the conductive elements and the diaphragm 200.

[0092] Optionally, the drive assembly 12 includes mechanisms such as cylinders, hydraulic cylinders, and motor screws.

[0093] For example, the drive component 12 includes two cylinders, which are respectively connected to the first conductive element 1 and the second conductive element 2. The cylinder drive has fast response and low cost, making it suitable for batch testing scenarios.

[0094] For example, the output rods of the two cylinders move synchronously, causing the first conductive element 1 and the second conductive element 2 to move closer to or further away from each other.

[0095] Optionally, the drive assembly 12 may also include a pressure sensor to monitor the clamping pressure in real time and prevent abnormal pressure from causing damage to the diaphragm 200 or poor contact.

[0096] In the technical solution of this application embodiment, since the driving component 12 drives the two conductive components to move closer or further apart, it can automatically clamp and release the diaphragm 200, improve detection efficiency and automation, and facilitate precise control of the contact pressure between the conductive component and the diaphragm 200.

[0097] In the embodiments of this application, each pair of conductive elements includes a first conductive element 1 and a second conductive element 2. The first conductive element 1 has a first conductive surface 1a, and the second conductive element 2 has a second conductive surface 2a. The first conductive surface 1a and the second conductive surface 2a are disposed opposite to each other along the first direction (Z). In the clamping state, the first conductive surface 1a and the second conductive surface 2a are respectively attached to both sides of the diaphragm 200 along the first direction (Z).

[0098] Optionally, the material of the first conductive element 1 can be the same as or different from the material of the second conductive element 2.

[0099] Optionally, the thickness of the first conductive element 1 may be the same as or different from that of the second conductive element 2.

[0100] Optionally, the first conductive element 1 can be connected to the positive or negative terminal of the power supply 60, and the second conductive element 2 can be connected to the other terminal of the power supply 60.

[0101] For example, such as Figure 1 As shown, the first conductive element 1 is connected to the negative terminal of the power supply 60, and the second conductive element 2 is connected to the positive terminal of the power supply 60.

[0102] For example, such as Figure 1 As shown, the first conductive element 1 and the second conductive element 2 are disposed opposite to each other along a first direction (Z), which is the thickness direction of the diaphragm 200. The first conductive surface 1a and the second conductive surface 2a are disposed opposite to each other and parallel to the diaphragm 200. In the clamping state, the conductive surfaces can adhere to the diaphragm 200.

[0103] For example, the conductive surface can be a complete plane so that the conductive surface has a sufficiently large contact area with the diaphragm 200, which facilitates bonding and the application of uniform pressure.

[0104] Optionally, the dimensions of the first conductive surface 1a and the second conductive surface 2a are matched with the dimensions of the detection septum 200.

[0105] Furthermore, this application does not impose any limitations on the flatness of the conductive surface in its embodiments.

[0106] Optionally, the shape of the conductive surface can be adjusted according to the testing requirements, the shape of the diaphragm 200, etc.

[0107] Optionally, the conductive surface can be designed with a conductive silicone layer or conductive bristles to accommodate the microscopic irregularities on the surface of the diaphragm 200 and improve contact reliability.

[0108] In the technical solution of this application embodiment, thus, in the clamping state, a surface contact is formed between the conductive element and the diaphragm 200; a larger detection area can be covered in a single clamping, making it easier to find more failure points and reduce missed detections caused by contact blind spots. At the same time, the larger contact area also makes the clamping more stable.

[0109] In the embodiments of this application, the projection is directed along the first direction (Z) to a projection surface perpendicular to the first direction (Z), and the projection of the first conductive surface 1a overlaps at least partially with the projection of the second conductive surface 2a. The temperature detector 50 is used to detect the overlapping portion of the projections.

[0110] It is understandable that the projected overlapping portion refers to the area where the first conductive surface 1a and the second conductive surface 2a overlap after being projected along the first direction (Z) onto a plane perpendicular to that direction. This area is the only path for current to pass through the diaphragm 200 at the failure point. That is, the current can only form a conductive circuit from the overlapping area of ​​the first conductive surface 1a through the failure point to the overlapping area of ​​the second conductive surface 2a. The failure point (located within the overlapping area) can conduct and generate heat, while there is no current in the non-overlapping area, thus avoiding interference from the self-heating of the conductive components.

[0111] Optionally, in this embodiment, the area and shape of the overlapping projection portion are not limited.

[0112] In the technical solution of this application embodiment, a current path perpendicular to the diaphragm 200 is formed between the two conductive surfaces. The current is concentrated at the short-circuit point and generates a thermal effect. The temperature detector 50 locks the short-circuit point location by detecting the overlapping portion, reducing the risk of missed detection due to failure points in the non-overlapping area. In addition, the shape or coverage area of ​​the projected overlapping portion can be adjusted to focus on detecting the area on the diaphragm 200 where a short circuit is most likely to occur, thereby improving the accuracy of detection.

[0113] In the embodiments of this application, the conductive element is made of a metal plate, the resistivity of the first conductive element 1 is not less than the resistivity of the second conductive element 2, and the temperature detector 50 is used to detect the temperature distribution of the first conductive element 1 when it is in a clamping state.

[0114] Optionally, the first conductive element 1 has a high resistivity.

[0115] For example, the resistance of the first conductive element 1 is greater than that of the second conductive element 2. According to Joule's law, when the current is the same, the part with higher resistance has higher heating power. That is, the temperature rise of the first conductive element 1 is more obvious, the heating signal is clearer, and it is easier to capture. The temperature detector 50 is used to detect the temperature distribution of the first conductive element 1.

[0116] Optionally, the material of the first conductive element 1 can be iron and its alloys, iron-chromium-aluminum alloy, nickel-chromium alloy, etc.

[0117] Alternatively, the material of the second conductive element 2 can be a copper alloy, such as copper or brass.

[0118] Optionally, the first conductive element 1 may include a first plating layer, the first plating layer including a first conductive surface 1a, and the material of the plating layer may be an iron-chromium-aluminum alloy, a nickel-chromium alloy, etc.

[0119] Alternatively, the second conductive element 2 may include a second plating layer, the second plating layer including a second conductive surface 2a, and the material of the plating layer may be a copper alloy.

[0120] In the technical solution of this application embodiment, since the first conductive element 1 generates significant heat when current passes through it, the heat generated at the failure point is easily detected. Therefore, the temperature detector 50 can more sensitively capture the heat generated at the failure point, enhancing the detection effect. In addition, the metal plate structure has good stability and moderate conductivity and thermal conductivity, allowing the heat generated at the failure point to be quickly transferred, shortening the response time of the temperature detector 50.

[0121] In the embodiments of this application, along the second direction (Y), the size of the first conductive surface 1a is not less than the size of the diaphragm 200, the size of the second conductive surface 2a is not less than the size of the diaphragm 200, and the second direction (Y) is the width direction of the diaphragm 200.

[0122] For example, the dimensions of the first conductive surface 1a and the second conductive surface 2a are equal to the dimensions of the diaphragm 200, which can improve the comprehensiveness of the detection and avoid the inability to contact and detect the conductive points located at the edge of the diaphragm 200 due to the small area of ​​the conductive components.

[0123] As another example, the width of the conductive surface can be slightly larger than the width of the diaphragm 200 to achieve 100% coverage.

[0124] In the technical solution of this application embodiment, since the dimensions of the first conductive surface 1a and the second conductive surface 2a are not less than the width dimension of the diaphragm 200, the conductive surfaces can cover the entire width of the diaphragm 200, eliminating blind spots in the width direction. This allows failure points throughout the entire width range of the diaphragm 200 to be clamped and detected, avoiding missed detections. Furthermore, during continuous clamping and detection, there is no need to adjust the width position of the diaphragm 200, shortening the clamping and detection time.

[0125] In the embodiments of this application, the detection device 100 includes a tensioning component 40. At least one tensioning component 40 is provided on the upstream side and the downstream side of the detection component 11. The tensioning component 40 is used to tension the diaphragm 200.

[0126] It should be noted that the tensioning component 40 is a component used to maintain the tension stability of the diaphragm 200 during the transmission process. It can eliminate the looseness and wrinkles of the diaphragm 200, which is conducive to the smooth entry of the diaphragm 200 into the detection area.

[0127] For example, such as Figure 1 As shown, a tensioning component 40 is provided on both the upstream and downstream sides of the detection component 11.

[0128] As another example, along a third direction (X), one tensioning assembly 40 is disposed between the unwinding roll 20 and the detection assembly 11, and another tensioning assembly 40 is disposed between the take-up roll 30 and the detection assembly 11.

[0129] Understandably, the tensioning assembly 40 installed upstream of the detection assembly 11 can pre-tension the diaphragm 200. The tensioning assembly 40 installed downstream of the detection assembly 11 can post-tension. The two tensioning assemblies 40 work together to tension the diaphragm 200, preventing the diaphragm 200 from being clamped in a slack state.

[0130] For example, such as Figure 1 As shown, the tensioning assembly 40 includes a pair of silicone rollers disposed on both sides of the diaphragm 200 along a first direction (Z), and the diaphragm 200 passes through the gap between the silicone rollers.

[0131] Optionally, the tensioning assembly 40 may also include bearings, tension adjustment mechanisms, etc., which are not limited in this application embodiment.

[0132] Optionally, the surface of the silicone roller may be coated with a wear-resistant coating.

[0133] Optionally, the tensioning assembly 40 is controlled by the controller 70 or the power supply 60 and can be synchronized with the unwinding roller 20 and the winding roller 30, that is, rotate synchronously and stop simultaneously.

[0134] In the technical solution of this application embodiment, since tensioning components 40 are provided upstream and downstream of the detection component 11, the flatness and stability of the diaphragm 200 can be improved, the diaphragm 200 is kept in a tensioned state during the detection process, and the diaphragm 200 is prevented from being loose or wrinkled, which would affect the detection accuracy. This is conducive to the conductive component forming good contact with the diaphragm 200 and improving the detection accuracy.

[0135] In the embodiments of this application, the detection device 100 includes a controller 70, which is connected to a power supply 60 and is used to control the power supply 60 to synchronously supply power to the drive assembly 12, the tensioning assembly 40, the unwinding roller 20 and the take-up roller 30.

[0136] Alternatively, the controller 70 may be a programmable logic controller 70 (PLC) or an industrial computer (IPC).

[0137] Optionally, the controller 70 can be integrated with the power supply 60.

[0138] It is understandable that synchronous power supply means synchronous control. The controller 70 simultaneously controls the movement of the drive assembly 12, the unwinding roller 20, the winding roller 30, and the tensioning assembly 40, and starts the drive assembly 12 to perform the clamping action.

[0139] In the technical solution of this application embodiment, since the controller 70 controls the power supply 60 to supply power to the drive assembly 12, tensioning assembly 40, unwinding roller 20 and winding roller 30 synchronously, it can coordinate the synchronous operation of each component, realize the automated synchronous control of the detection process, improve the overall operating efficiency, and also avoid the risk of the diaphragm 200 being stretched, loosened or deformed due to asynchrony.

[0140] In the embodiments of this application, the voltage across the two poles of the power supply 60 is no greater than 220V, and the clamping state lasts for 10-15 seconds.

[0141] Optionally, the clamping state can last for any value among 10s, 10.2s, 10.4s, 10.6s, 10.8s, 11s, 11.2s, 11.4s, 11.6s, 11.8s, 12s, 12.2s, 12.4s, 12.6s, 12.8s, 13s, 13.2s, 13.4s, 13.6s, 13.8s, 14s, 14.2s, 14.4s, 14.6s, 14.8s, and 15s, or a value between any two values.

[0142] Alternatively, in some other embodiments, the clamping state may exceed 15 seconds, during which the failure point can be determined by the melting point location on the diaphragm 200.

[0143] In the technical solution of this application embodiment, since the voltage and clamping time are within a suitable range, energy consumption and detection accuracy can be balanced. This avoids insufficient heating of the failure point due to too short a clamping time, which would prevent the temperature detector 50 from capturing the temperature difference. Conversely, excessively long clamping time would result in an excessively large area of ​​the captured heating zone, reducing positioning accuracy.

[0144] In embodiments of this application, the temperature detector 50 includes at least one of an infrared sensor, an infrared thermal imager, and an infrared scanning thermometer.

[0145] For example, such as Figure 1 As shown, the temperature detector 50 is connected to the mounting plate 80 via a bracket and is used to measure temperature.

[0146] It is understood that an infrared sensor is a non-contact device that uses the infrared radiation of an object to detect temperature and converts the radiation signal into an electrical signal. The infrared detector can be thermal or photoelectric, and this application does not limit this.

[0147] Understandably, an infrared thermal imager is a device that converts the infrared radiation of an object into a visual thermal image. It performs thermal imaging on conductive components in a clamped state to analyze the failure points caused by heat generation.

[0148] It is understood that an infrared scanning thermometer is a device that detects temperature distribution through laser scanning and infrared detection, including a laser emitter and an infrared detector. Optionally, the laser can scan the conductive components along the width of the diaphragm by 200 mm.

[0149] In other embodiments, in harsh environments (such as dust, infrared interference), the temperature detector 50 can use a microwave radiation thermometer or an ultrasonic thermometer.

[0150] In the technical solution of this application embodiment, since infrared radiation temperature detection method is selected, it is possible to scan and detect temperature distribution quickly and non-contactly, thereby improving detection speed and accuracy of capturing heat points. In addition, it also has the advantages of strong environmental anti-interference and fast response speed.

[0151] In the embodiments of this application, the detection device 100 includes a mounting plate 80, and the unwinding roller 20, the take-up roller 30, the clamping mechanism 10 and the power supply 60 are all connected to the mounting plate 80.

[0152] For example, such as Figure 1 As shown, mounting plate 80 is the base component used to fix all components.

[0153] Understandably, the mounting plate 80 has a certain degree of rigidity and flatness to avoid detection errors caused by component misalignment.

[0154] Optionally, the mounting plate 80 can be flat, and the material can be steel alloy or aluminum alloy.

[0155] In the technical solution of this application embodiment, since the unwinding roller 20, the winding roller 30, the clamping mechanism 10 and the power supply 60 are all connected to the mounting plate 80, the mounting plate 80 can provide a stable support structure, improve the accuracy of the relative positions of each component, and improve the integration and space utilization of the detection device 100.

[0156] A second aspect of the embodiments of this application provides a detection method.

[0157] The method includes the following steps:

[0158] Unwinding: Unwinding roller 20, unwinding diaphragm 200, tensioning assembly 40, tensioning diaphragm 200;

[0159] Clamping: The unwinding roller 20, the winding roller 30, and the tensioning assembly 40 stop rotating, and the driving assembly 12 drives the first conductive element 1 and the second conductive element 2 to approach each other until they are in contact with the diaphragm 200;

[0160] Power on: Power supply 60 applies voltage to the first conductive element 1 and the second conductive element 2, and the first conductive element 1 and the second conductive element 2 clamp the diaphragm 200 for 10-15 seconds; temperature detector 50 detects the temperature distribution of the first conductive element 1 and / or the second conductive element 2.

[0161] Analysis: The first conductive element 1 and the second conductive element 2 are far apart from each other and away from the diaphragm 200; the temperature distribution determines whether there is a failure point in the tested part of the diaphragm 200.

[0162] Understandably, after the analysis is completed, the remaining portion of the diaphragm 200 can be unwound and tested.

[0163] The specific solutions of the embodiments of this application are described below with reference to the accompanying drawings.

[0164] In related technologies, the failure point of the separator 200 of an abnormal self-discharge battery is found by visual inspection. The failure point is usually black and is composed of metallic components, which may lead to misjudgment. In addition, the separator 200 needs to be folded and unfolded one by one to find the failure point, which is extremely time-consuming.

[0165] This embodiment discloses a detection device 100, which can solve the problem of low efficiency and easy misjudgment in finding the failure point of the separator 200 of lithium battery self-discharge defective product. The specific solution is as follows.

[0166] like Figure 1 As shown, a detection device 100 includes a mounting plate 80, a first conductive element 1, a second conductive element 2, a temperature detector 50, a power supply 60, silicone rollers (tensioning assembly 40), a drive assembly 12, an unwinding roller 20, a winding roller 30, etc.

[0167] In a specific embodiment, a detection component 11 is provided downstream of the unwinding roller 20 and upstream of the winding roller 30. The detection component 11 includes a first conductive element 1, a second conductive element 2, and a temperature detector 50.

[0168] In a specific embodiment, tensioning components 40 are also provided upstream and downstream of the detection component 11.

[0169] In a specific embodiment, the two poles of the power supply 60 are electrically connected to the first conductive element 1 and the second conductive element 2, respectively.

[0170] In a specific embodiment, the first conductive element 1 and the second conductive element 2 are respectively disposed on both sides of the diaphragm 200 along the first direction (Z), the first conductive surface 1a of the first conductive element 1 faces the side where the diaphragm 200 is located, and the second conductive surface 2a of the second conductive element 2 faces the side where the diaphragm 200 is located.

[0171] In a specific embodiment, both the first conductive element 1 and the second conductive element 2 are connected to the driving assembly 12 for transmission.

[0172] In a specific embodiment, the temperature detector 50 includes an infrared thermal sensor.

[0173] The testing method is as follows: First, the diaphragm 200 is spliced, that is, a certain length of PE film is spliced ​​at the beginning of the diaphragm 200 (the length of this PE film is from the unwinding roller 20 to the take-up roller 30); then, the diaphragm 200 starts to unwind, the diaphragm 200 starts to move horizontally, and at the same time, the drive assembly 12 starts to drive the first conductive element 1 and the second conductive element 2 to move up and down intermittently, and the power supply 60 supplies power synchronously. If a conductive point exists on the diaphragm 200, forming a circuit and generating current, the PLC connected to the power supply 60 can control the drive assembly 12, unwinding roller 20, winding roller 30, and silicone roller to stop moving. At this time, the first conductive element 1 and the second conductive element 2 are tightly pressed against the diaphragm 200. The power supply 60 can provide a large voltage to ensure a significant thermal effect. Simultaneously, the infrared thermal sensor begins to scan back and forth in the horizontal direction. At this time, due to the current flowing through the conductive element, the conductive point has a significant thermal effect and is captured and located by the infrared thermal sensor. Then, the first conductive element 1 and the second conductive element 2 are released, and the conductive point (failure point) is marked on the diaphragm 200 in the infrared-located area. Through the above device, the rapid and accurate analysis of defects in the diaphragm 200 is achieved, and the analysis efficiency is improved by the automated and continuous diaphragm 200 traction feeding.

[0174] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0175] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0176] Unless otherwise specified, all steps of this application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order; for example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0177] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and all should be covered within the scope of protection claimed in this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of protection claimed.

Claims

1. A detection device for detecting a diaphragm, characterized in that, The device includes an unwinding roller, a winding roller, a clamping mechanism, and a power supply. The winding roller is located downstream of the unwinding roller and is configured to convey the diaphragm to the winding roller. The clamping mechanism includes a detection component and a driving component. The detection component is located downstream of the unwinding roller and upstream of the winding roller. The detection component includes at least one pair of conductive elements and a temperature detector. Each pair of conductive elements is used to clamp the diaphragm. Two of the conductive elements in each pair are arranged opposite to each other along a first direction. One of the conductive elements in each pair is connected to the positive terminal of the power supply, and the other is connected to the negative terminal of the power supply. The driving component is drivenly connected to at least one of the conductive elements in each pair and is used to drive the conductive elements located on both sides of the diaphragm to move closer or further apart. The temperature detector is used to detect the temperature distribution of the conductive elements in the clamped state.

2. The detection device according to claim 1, characterized in that, Each pair of conductive elements includes a first conductive element and a second conductive element. The first conductive element has a first conductive surface, and the second conductive element has a second conductive surface. The first conductive surface and the second conductive surface are disposed opposite to each other along the first direction. In the clamping state, the first conductive surface and the second conductive surface are respectively attached to both sides of the diaphragm along the first direction.

3. The detection device according to claim 2, characterized in that, The projection is directed along the first direction onto a projection surface perpendicular to the first direction, and the projection of the first conductive surface at least partially overlaps with the projection of the second conductive surface. The temperature detector is used to detect the overlapping portion of the projections.

4. The detection device according to claim 3, characterized in that, The conductive component is made of a metal plate, the resistivity of the first conductive component is not less than the resistivity of the second conductive component, and the temperature detector is used to detect the temperature distribution of the first conductive component when it is in a clamped state.

5. The detection device according to claim 2, characterized in that, Along the second direction, the size of the first conductive surface is not less than the size of the diaphragm, the size of the second conductive surface is not less than the size of the diaphragm, and the second direction is the width direction of the diaphragm.

6. The detection device according to any one of claims 1 to 5, characterized in that, The detection device includes a tensioning component, with at least one tensioning component disposed on the upstream side and the downstream side of the detection component, the tensioning component being used to tension the diaphragm.

7. The detection device according to claim 6, characterized in that, The detection device includes a controller connected to the power supply, which controls the power supply to synchronously supply power to the drive assembly, the tensioning assembly, the unwinding roller, and the winding roller.

8. The detection device according to any one of claims 1 to 5, characterized in that, The voltage across the two poles of the power supply is no greater than 220V, and the clamping state lasts for 10-15 seconds.

9. The detection device according to any one of claims 1 to 5, characterized in that, The temperature detector includes at least one of an infrared sensor, an infrared thermal imager, and an infrared scanning thermometer.

10. The detection device according to any one of claims 1 to 5, characterized in that, The detection device includes a mounting plate, and the unwinding roller, the winding roller, the clamping mechanism, and the power supply are all connected to the mounting plate.

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