Foreign matter detection device for battery cell coating film

Abstract

The utility model discloses a foreign matter detection device for a battery cell coating film, and relates to the technical field of batteries. The foreign matter detection device comprises a pressing assembly, a force source assembly and a voltage withstanding instrument, the pressing assembly comprises two pressing plates, at least one pressing plate can move in the first direction to extrude and release a battery cell, and the pressing assembly comprises a conductive part used for making contact with the surface of the battery cell; the force source assembly is connected with at least one of the two pressing plates so as to drive the pressing plates to move in the first direction. The voltage withstanding instrument is electrically connected with the conductive part and the battery cell; wherein at least one of the two pressing plates is a composite plate, the composite plate comprises a supporting part, at least two sub-plates and an elastic part, and the at least two sub-plates are sequentially arranged along the surface in contact with the battery cell; and an elastic part is connected between each sub-plate and the supporting part. The foreign matter detection device for the battery cell coating film can better adapt to concave and convex parts on the surface of the battery cell, so that the accuracy and the reliability of foreign matter detection are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a foreign matter detection device for battery cell coating film. BACKGROUND

[0002] In the production process of the battery cell, various subtle factors can cause micro short circuit inside the battery cell. For example, the tiny particles or metal residues on the pole piece, the subtle defects of the diaphragm, and the dust mixed during assembly are all potential risk points. Therefore, the foreign matter detection device can be used to detect whether there is metal foreign matter on the surface of the battery cell.

[0003] The existing part of the foreign matter detection device connects the pressure instrument on the battery cell and the pressing plate to detect the pressure resistance of the two sides of the coating film to determine whether the coating film is damaged. However, the surface of the battery cell is not always completely flat, and there are concave and convex parts. When the metal foreign matter falls in the concave area of the surface of the battery cell, the pressing plate in the detection device may miss these hidden dangers due to the failure to form a good pressing with the surface of the battery cell, thereby affecting the accuracy of the detection result.

[0004] Therefore, the foreign matter detection device has certain improvement space. CONTENT OF THE UTILITY MODEL

[0005] The utility model aims at solving one of the technical problems in the prior art. To this end, the utility model provides a foreign matter detection device for battery cell coating film, which can better adapt to the concave and convex parts of the surface of the battery cell, thereby improving the accuracy and reliability of foreign matter detection.

[0006] The foreign matter detection device for battery cell coating film according to the utility model embodiment comprises a pressing assembly, a force source assembly and a pressure instrument, the pressing assembly comprises a first pressing plate and a second pressing plate, the first pressing plate and the second pressing plate are arranged on the opposite sides of the battery cell along a first direction, at least one of the first pressing plate and the second pressing plate can move along the first direction to press and release the battery cell, the pressing assembly comprises a conductive part for contacting the surface of the battery cell; the force source assembly is connected with at least one of the first pressing plate and the second pressing plate to drive it to move along the first direction; the pressure instrument is used for electrically connecting with the conductive part and the battery cell; wherein at least one of the first pressing plate and the second pressing plate is a composite plate, the composite plate comprises a supporting part, at least two sub-plates and an elastic part, and the at least two sub-plates are arranged in sequence along the surface contacting the battery cell; the elastic part is connected between each sub-plate and the supporting part.

[0007] The foreign matter detection device for the battery cell coating film according to the embodiment of the present application realizes fine detection on the surface of the battery cell by setting the composite plate as a part of the pressing assembly. The at least two sub-plates in the composite plate are arranged in sequence along the contact surface of the battery cell, and each sub-plate is connected with the supporting part through the elastic part, which makes each sub-plate independently and flexibly adapt to the uneven surface of the battery cell. When the battery cell is clamped by the first pressing plate and the second pressing plate, different sub-plates can independently adhere to the recessed and protruding parts of the battery cell.

[0008] In addition, by setting the conductive parts on each sub-plate, the conductive parts, the battery cell and the two ends of the voltage resistance instrument form good electrical contact, thereby allowing the voltage resistance instrument to accurately test the electrical performance of the battery cell coating film.

[0009] The foreign matter detection device ensures the comprehensiveness and reliability of the detection process and provides strong support for the quality control of the battery cell.

[0010] The foreign matter detection device for the battery cell coating film according to the embodiment of the present application, the elastic part includes a spring, and each sub-plate is connected with the supporting part through at least one spring.

[0011] In some optional embodiments, the spring is a cylindrical spring, the spring is arranged in a direction perpendicular to the sub-plate, and the spring is a plurality of spaced-apart springs.

[0012] The foreign matter detection device for the battery cell coating film according to the embodiment of the present application, each surface of each sub-plate facing the battery cell is provided with the conductive part.

[0013] The foreign matter detection device for the battery cell coating film according to the embodiment of the present application, the conductive part includes a conductive tape arranged on at least one of the first pressing plate and the second pressing plate.

[0014] In some optional embodiments, the conductive tape is an adhesive tape and is adhered to the first pressing plate and the second pressing plate.

[0015] The foreign matter detection device for the battery cell coating film according to the embodiment of the present application, the pressing assembly further includes a third pressing plate connected to at least one of the first pressing plate and the second pressing plate, and at least part of the third pressing plate is located between the first pressing plate and the second pressing plate to be pressed on the side surface of the battery cell.

[0016] The foreign matter detection device for the battery cell coating film according to the embodiment of the present application further includes a vibration generator, and the force source assembly is connected to the first pressing plate, and the vibration generator is connected to the second pressing plate.

[0017] The foreign matter detection device of the battery cell coating film according to the embodiment of the utility model, the force source subassembly includes: servo drive piece and pressure sensor, pressure sensor sets up on the pressure assembly, to detect with the pressure between the battery cell, servo drive piece with pressure sensor electricity is connected, to adjust driving force.

[0018] The foreign matter detection device of the battery cell coating film according to the embodiment of the utility model further includes: support frame, the force source subassembly, pressure instrument, the second pressure plate are installed on the support frame, the first pressure plate is connected the output end of force source subassembly.

[0019] The foreign matter detection device of the battery cell coating film according to the embodiment of the utility model further includes: guiding component between the first pressure plate and the support frame, the guiding component includes: guide hole and guide column, the guide hole is arranged on the support frame, the guide column is connected on the first pressure plate, the guide column is along the first direction and is arranged in extension, and is matched with the guide hole.

[0020] Additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above and / or additional aspects and advantages of the utility model will become apparent and more readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0022] Figure 1 It is the structure schematic view of foreign matter detection device of some embodiments of the utility model;

[0023] Figure 2 It is the front view of foreign matter detection device of some embodiments of the utility model;

[0024] Figure 3 It is the structure schematic view of composite board of some embodiments of the utility model;

[0025] Figure 4 It is the perspective view of pressure assembly of some embodiments of the utility model;

[0026] Figure 5 It is the side view of pressure assembly of some embodiments of the utility model;

[0027] Figure 6 It is the position schematic view of vibration generator of some embodiments of the utility model.

[0028] REFERENCE NUMERALS:

[0029] Foreign matter detection device 100, pressing assembly 10, first pressing plate 11, second pressing plate 12, third pressing plate 13, conductive part 14, conductive band 141, composite plate 15, support part 151, split plate 152, elastic part 153,

[0030] Force source assembly 20, servo drive 22, pressure sensor 23, pressure resistance instrument 30, vibration generator 40, support frame 50, guide assembly 60, guide hole 61, guide column 62. DETAILED DESCRIPTION

[0031] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, and are used only for explaining the present application, and cannot be understood as a limitation of the present application.

[0032] In the description of the present application, it is to be understood that the terms "transverse", "length", "width", "upper", "lower", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0033] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] The disclosure below provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to numbers and / or letters in different examples. Such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the applicability of other processes and / or the use of other materials.

[0035] The following description refers to the accompanying drawings of Figures 1-6 The foreign matter detection device 100 of the battery cell coating film according to the embodiments of the present application is described.

[0036] As Figure 1 shown, the foreign matter detection device 100 of the battery cell coating film includes a pressing assembly 10, a force source assembly 20 and a pressure resistance instrument 30.

[0037] Here, the pressing assembly 10 is responsible for fixing and pressing the battery cell at the detection position, so as to carry out the subsequent pressure resistance test. In combination Figure 1 , the pressing assembly 10 includes a first pressing plate 11 and a second pressing plate 12. The first pressing plate 11 and the second pressing plate 12 are arranged along a first direction to be arranged on opposite sides of the battery cell.

[0038] One of the first pressing plate 11 and the second pressing plate 12 can move along a direction perpendicular to the surface of the battery cell, so as to realize the pressing of the battery cell.

[0039] Here, the first direction can be a vertical direction, in some technical solutions, the first direction can be a horizontal direction, or other directions, which are not limited in particular. In combination Figure 1 , the first direction is taken as the vertical direction in this application, which will not be described below.

[0040] In some technical solutions, the second pressing plate 12 is fixedly arranged, at this time, the first pressing plate 11 is movable along the first direction; or the first pressing plate 11 is fixedly arranged, and the second pressing plate 12 is movable along the first direction; or both the first pressing plate 11 and the second pressing plate 12 are movable along the first direction. When the battery cell needs to be pressed, the two pressing plates will simultaneously approach the battery cell from both sides until a predetermined pressing force is reached. When the battery cell needs to be released, the two pressing plates will move away from the surface of the battery cell along opposite directions simultaneously or respectively. Through the setting of different pressing plates, higher flexibility and adaptability can be provided, which can adapt to battery cells of different sizes and shapes.

[0041] The pressing assembly 10 includes a conductive part 14 for contacting the surface of the battery cell.

[0042] In some optional embodiments, the conductive part 14 is a piece of conductive material, such as a piece of copper, a piece of aluminum or a piece of other alloy, or a piece of other conductive material.

[0043] When the coating film on the surface of the battery cell is punctured by a foreign object, the conductive part 14 on the pressing assembly 10 will directly contact the exposed surface of the battery cell, thereby establishing an electrical connection channel and realizing electrical communication.

[0044] The force source assembly 20 is connected to at least one of the first pressing plate 11 and the second pressing plate 12 to drive it to move in the first direction.

[0045] Optionally, the force source assembly 20 can be a pneumatic cylinder, a hydraulic cylinder or a motor, etc. The motor can also be a servo motor, a stepper motor, etc. The output end of the force source assembly 20 is connected to the corresponding pressing plate through a transmission mechanism. The transmission mechanism can be a connecting rod, a gear, a chain, etc.

[0046] In some optional embodiments, a speed reducer is further included between the force source assembly 20 and the corresponding pressing plate.

[0047] The speed reducer is a transmission device used to reduce the speed and increase the torque. The speed reducer can convert the high-speed low-torque power output by the force source assembly 20 into low-speed high-torque power output, so as to better adapt to the pressure requirements in the foreign object detection device 100 and enable the force source assembly 20 to more accurately control the pressing force of the pressing plate on the battery cell.

[0048] Optionally, by adjusting the speed reduction ratio of the speed reducer, the movement speed of the pressing plate and the size of the applied pressure can be flexibly adjusted to meet the needs of different detection requirements.

[0049] In some technical solutions, as shown in Figure 1 and Figure 2 , the force source assembly 20 is connected to the first pressing plate 11 to drive the first pressing plate 11 to move in the first direction. In some technical solutions, the force source assembly 20 is connected to the second pressing plate 12 to drive the second pressing plate 12 to move in the first direction. Alternatively, the force source assembly 20 is connected to both the first pressing plate 11 and the second pressing plate 12 to simultaneously drive both to move. In addition, in some technical solutions, the first pressing plate 11 and the second pressing plate 12 can be connected to different force source assemblies 20 to realize separate control of the two.

[0050] As shown in Figure 2 , the pressure resistance instrument 30 is used to be electrically connected with the conductive part 14 and the battery cell 200.

[0051] The pressure resistance instrument 30 is a kind of test equipment, and its role is to monitor the value between the conductive part 14 and the battery cell in real time.

[0052] Some voltage-withstanding instruments 30 apply alternating current to both sides of the cell coating film during operation, while the voltage-withstanding instrument 30 monitors the change of current passing through the positive / negative ends.

[0053] In this technical solution, the voltage-withstanding instrument 30 is electrically connected with the conductive part 14 and the cell. Then, the alternating current output and leakage current monitoring function of the voltage-withstanding instrument 30 are used to detect the integrity of the cell coating film.

[0054] When the cell coating film is in an intact state, the conductive part 14 is spaced apart from the cell by the cell coating film, ensuring that they do not come into contact with each other. In this state, although the voltage-withstanding instrument 30 continuously provides alternating current, the monitored leakage current remains at a very low level, usually close to zero, because the conductive part 14 and the cell are well insulated from each other.

[0055] However, if the cell coating film is damaged, the insulation between the conductive part 14 and the cell is lost, and they come into contact with each other. When the conductive part 14 and the cell come into contact with each other, the voltage-withstanding instrument 30 monitors a sudden change in current.

[0056] This sudden change in current is a direct indication of damage to the cell coating film. Through the real-time monitoring function of the voltage-withstanding instrument 30, this change can be quickly captured and an appropriate alarm or prompt can be issued. In this way, damage to the cell coating film can be detected in a timely manner.

[0057] Some voltage-withstanding instruments 30 monitor the voltage-withstanding capacity of the cell coating film to assess its integrity. When the cell coating film is in an intact state, the voltage-withstanding capacity on both sides of the cell coating film is relatively large. Sometimes, the voltage-withstanding capacity on both sides of an intact cell coating film is above 3000V. When the cell coating film is damaged, the voltage-withstanding capacity on both sides of the cell coating film decreases significantly. Sometimes, the voltage-withstanding capacity on both sides of a damaged cell coating film is below 500V. This change in voltage-withstanding capacity serves as an indicator for detecting whether the cell coating film is damaged, helping to detect potential safety hazards in a timely manner and ensuring the quality and safety of the cell.

[0058] However, the surface of some cells is not a completely flat plane and may have protruding and recessed parts. Therefore, in combination with Figure 3 , at least one of the first pressure plate 11 and the second pressure plate 12 in the technical solution of the utility model is a composite plate 15, which includes a support part 151, at least two sub-plates 152, and an elastic part 153. The at least two sub-plates 152 are arranged in sequence along the surface in contact with the cell. The elastic part 153 is connected between each sub-plate 152 and the support part 151.

[0059] The support part 151 provides the necessary rigidity for the composite plate 15 to support the sub-plates 152. Optionally, the support part 151 can be made of high-strength, corrosion-resistant materials to ensure its reliability and durability for long-term use.

[0060] The sub-plates 152 are at least two and are in direct contact with the battery cells. They are arranged in sequence along the surface in contact with the battery cells. Each sub-plate 152 is independent, which means they can be fitted according to the specific shape of the battery cell surface to achieve the best contact effect.

[0061] In an optional layout, multiple sub-plates 152 can be arranged along the length of the battery cell. This layout is suitable for battery cells with long length and requires detailed detection along the length direction. By properly setting the interval between the sub-plates 152, it can ensure that every area of the battery cell surface can be fully detected, thereby effectively identifying potential foreign objects.

[0062] Another optional layout is that multiple sub-plates 152 are arranged along the width direction of the battery cell. This layout is suitable for battery cells with large width and requires focused detection along the width direction. By adjusting the position and number of sub-plates 152 in the width direction, targeted detection of different areas of the battery cell surface can be achieved, improving the specificity and accuracy of detection.

[0063] In addition, a more flexible layout can also be adopted, that is, multiple sub-plates 152 are arranged along the length and width directions of the battery cell at the same time. This layout achieves more comprehensive coverage and detailed detection of the battery cell surface by properly adjusting the arrangement position and number of sub-plates 152 along the length and width directions.

[0064] It is worth noting that each sub-plate 152 is independent, which means they can be fitted according to the specific shape of the battery cell surface. This design not only improves the contact effect between the sub-plate 152 and the battery cell, but also helps to reduce the detection error caused by shape mismatch.

[0065] As shown in Figure 3 and Figure 4 The elastic part 153 is connected between the support part 151 and each sub-plate 152. The elastic part 153 allows the sub-plate 152 to be adjusted within a certain range when subjected to pressure, to adapt to the unevenness of the battery cell surface.

[0066] Optionally, the elastic part 153 can be a rubber piece, a spring piece, or other elastic material piece. In addition, the rigidity and elasticity of the elastic part 153 can be adjusted according to actual needs. This design not only increases the contact area between the pressure plate and the battery cell, but also reduces the stress concentration phenomenon caused by the unevenness of the battery cell surface, thereby prolonging the service life of the battery cell and the pressure plate.

[0067] By setting multiple sub-plates 152, the concave-convex surface of the battery cell can be better adapted to, thereby realizing more uniform and closer contact, and further improving the monitoring accuracy of the pressure resistance instrument 30.

[0068] Moreover, each sub-plate 152 is independent and has a certain elasticity, which can more effectively adapt to the unevenness of the surface of the battery cell, thereby accurately detecting the damage of the battery package film.

[0069] According to the foreign matter detection device 100 of some embodiments of the present application, the elastic part 153 comprises a spring, and each sub-plate 152 is connected and supported by at least one spring.

[0070] These springs can provide the necessary elasticity, so that each sub-plate 152 can independently adapt to the surface of the battery cell, allow the sub-plate 152 to automatically adjust at the protrusions and depressions of the surface of the battery cell, and also ensure that the sub-plate 152 can maintain a certain pressure during contact with the battery cell, thereby realizing the best contact effect.

[0071] Optionally, the spring is connected between the sub-plate 152 and the support part 151 by a fixing device such as a bolt, a nut or a buckle. These fixing devices are easy to disassemble and maintain, so that they can be easily replaced during long-term use.

[0072] Optionally, as shown in Figure 4 , the spring is a cylindrical spring, and the spring is arranged in a direction perpendicular to the sub-plate 152. The spring is a plurality of spaced-apart springs.

[0073] In the above technical solution, the cylindrical springs are arranged in a direction perpendicular to the sub-plate 152. This means that if the sub-plate 152 is regarded as a plane, the spring is installed perpendicular to this plane. This installation method enables the spring to provide effective support when the sub-plate 152 is subjected to a force perpendicular to its own plane.

[0074] In addition, the springs are a plurality of spaced-apart springs. First, the spaced-apart distribution can ensure that each spring can independently function, and will not be affected by the interference of adjacent springs, thereby maintaining stable contact between the sub-plate 152 and the battery cell. Second, the spaced-apart distribution of the springs also enables different regions of each sub-plate 152 to be more closely attached to the surface of the battery cell, so as to ensure that each part of the sub-plate 152 can form good contact with the surface of the battery cell, thereby improving the accuracy of detection and also helping to reduce test errors caused by poor contact.

[0075] According to some optional embodiments of the present application, as shown in Figure 4 , the surface of each sub-plate 152 in the foreign matter detection device 100 facing the battery cell is provided with a conductive part 14.

[0076] The conductive part 14 is arranged to be more closely and flexibly adapted to the surface of the battery cell. In practical applications, the surface of the battery cell is often not completely flat, and can be partly convex and partly concave.

[0077] The independently arranged and self-adapting conductive part 14 can better fit the surface of the battery cell and ensure stable electrical contact in various situations, thereby improving the accuracy of detection. Because the conductive part 14 closely fits the surface of the battery cell, it reduces test errors caused by poor contact, so that the foreign matter detection device 100 can more accurately capture any abnormal changes on the surface of the battery cell.

[0078] In some optional embodiments, the conductive part 14 includes a conductive strip 141 arranged on at least one of the first pressing plate 11 and the second pressing plate 12.

[0079] The conductive strips 141 are arranged on at least one of the first pressing plate 11 and the second pressing plate 12. This arrangement ensures stable electrical conductivity. Moreover, in the pressing process, the flexible properties of the conductive strips 141 can better adapt to and fit the surface of the battery cell, thereby improving detection accuracy.

[0080] Optionally, the conductive strips 141 include a highly conductive material, such as copper, aluminum, or nickel-plated steel, to ensure good current transmission performance.

[0081] When the conductive strips 141 are arranged on the first pressing plate 11 or the second pressing plate 12, they can be attached by conductive adhesive to prevent loosening or falling off during use.

[0082] This arrangement using conductive strips 141 not only improves the self-adapting ability of the conductive part 14 to the surface of the battery cell, but also makes the structure of the entire foreign matter detection device 100 more compact and reliable, thereby improving detection effectiveness.

[0083] In some embodiments, as shown in FIG. 1A, the conductive part 14 includes a conductive strip 141 arranged on at least one of the first pressing plate 11 and the second pressing plate 12. Figure 5

[0084] This adhesive tape combines a conductive material and an adhesive material. By using such a tape with conductive properties, the process of electrical connection is simplified, and the complexity and cost of traditional connection methods (such as welding, screwing, etc.) are reduced. At the same time, the conductive adhesive tape has high adaptability and flexibility, and can meet the needs of adhesion to various shapes and curved surfaces, providing more possibilities for the manufacture of the foreign matter detection device 100.

[0085] ​Optionally, conductive particles (such as metal powder, carbon powder, etc.) or conductive fibers are embedded in the adhesive tape. These conductive particles or conductive fibers form a conductive path inside the adhesive tape, allowing the current to flow smoothly through the adhesive tape.

[0086] Optionally, the surface of the adhesive tape has an adhesive layer. This adhesive layer allows the adhesive tape to closely adhere to the first pressing plate 11 and the second pressing plate 12, and is not easy to fall off or loosen.

[0087] Optionally, the strength of the adhesive layer can be adjusted by the formula and manufacturing process of the adhesive tape to adapt to different application scenarios and bonding needs.

[0088] According to some embodiments of the present application, the foreign matter detection device 100, as shown in Figure 5 The pressing assembly 10 further comprises a third pressing plate 13 connected to at least one of the first pressing plate 11 and the second pressing plate 12, and at least part of the third pressing plate 13 is located between the first pressing plate 11 and the second pressing plate 12 to press on the side of the battery cell.

[0089] This is because, if there are foreign matters on the side of the battery cell, it will cause potential threats to the performance and safety of the battery cell.

[0090] Therefore, in the above technical solution, when the pressing assembly 10 presses the battery cell, the third pressing plate 13 will press on the side of the battery cell, forming an additional detection dimension.

[0091] By adding the third pressing plate 13, effective detection of the side of the battery cell can be achieved, thereby improving the accuracy and comprehensiveness of foreign matter detection.

[0092] As shown in Figure 6 According to some embodiments of the present application, the foreign matter detection device 100 further comprises a vibration generator 40. The force source assembly 20 is connected to the first pressing plate 11, and the vibration generator 40 is connected to the second pressing plate 12.

[0093] Specifically, the two pressing plates are located on both sides of the battery cell and are used to press the battery cell under the action of the force source assembly 20.

[0094] When the foreign matter detection device 100 is working, the force source assembly 20 provides stable pressure to press the battery cell through the pressing plate. At the same time, the vibration generator 40 starts to work, so that the surface of the battery cell is subjected to repeated fatigue stress.

[0095] When there is no metal foreign matter between the battery cell and the coating film, the coating film can remain intact under the action of vibration and pressure and will not be damaged.

[0096] When there is a metal foreign object between the battery cell and the coating film, the metal foreign object will generate additional pressure on the coating film under the action of vibration and extrusion. This additional pressure will cause the coating film to break down under the condition of fatigue extrusion stress. Once the coating film is damaged, the surface of the battery cell originally isolated by the coating film will form an electrical contact with the pressure plate, and this direct electrical contact will cause a change in the value of the pressure tester 30, thereby achieving effective detection of foreign objects under the coating film of the battery cell.

[0097] In yet some optional embodiments, the force source assembly 20 is connected to the second pressure plate 12. The vibration generator 40 is connected to the first pressure plate 11. By connecting the second pressure plate 12 through the force source assembly 20, a stable driving force is provided to ensure that the second pressure plate 12 can accurately move in the first direction and uniformly extrude the battery cell. At the same time, the vibration generator 40 is connected to the first pressure plate 11 to achieve the detection purpose.

[0098] According to the foreign object detection device 100 of some embodiments of the present application, in combination with Figure 2 and Figure 3 , the force source assembly 20 includes a servo drive 22 and a pressure sensor 23. The pressure sensor 23 is arranged on the pressure assembly 10 to detect the pressure between the battery cell. The servo drive 22 is electrically connected to the pressure sensor 23 to adjust the driving force.

[0099] In the above technical solution, by receiving the signal feedback by the pressure sensor 23, the servo drive 22 can intelligently adjust the driving force outputted by it, thereby ensuring that the pressure applied by the pressure assembly 10 to the battery cell remains within the preset ideal range.

[0100] In combination with Figures 1-2 and Figure 6 , the foreign object detection device 100 according to some embodiments of the present application further comprises a support frame 50. The force source assembly 20, the pressure tester 30, and the second pressure plate 12 are installed on the support frame 50, and the first pressure plate 11 is connected to the output end of the force source assembly 20.

[0101] The support frame 50 is used to support the force source assembly 20, the pressure tester 30, and the second pressure plate 12. On this support frame 50, the force source assembly 20, the pressure tester 30, and the second pressure plate 12 are all fixed through the fixing assembly, ensuring their stability and accuracy during the detection process. At the same time, the first pressure plate 11 is closely connected to the output end of the force source assembly 20, so that it can receive stable driving force from the force source assembly 20, realizing accurate pressure assembly operation on the battery cell. Such a design not only improves the detection efficiency, but also ensures the reliability of the detection result.

[0102] Optionally, the support frame 50 comprises two frames. One of the frames is used to mount the force source assembly 20, and the first pressing plate 11 is connected to the force source assembly 20. The other frame is used to mount the pressure resistance instrument 30 and the second pressing plate 12. By dividing the support frame 50 into two independent frames, each frame and the components thereon can be modularly installed. After the two frames are installed respectively, they can be combined together through appropriate connecting methods (such as bolts, welding, buckling, etc.) to form a complete support frame 50.

[0103] Optionally, the support frame 50 comprises a plurality of rod members. The rod members are connected to each other through welding, bolting or other fastening methods to form a stable and adjustable frame structure. The connection of the rod members can not only ensure the strength of the support frame 50, but also facilitate the adjustment of the positions of the various components according to actual needs to meet different position requirements.

[0104] Optionally, the foreign matter detection device 100 further comprises a guide assembly 60 arranged between the first pressing plate 11 and the support frame 50. The guide assembly 60 is used to ensure the accurate movement trajectory of the first pressing plate 11.

[0105] Specifically, as shown in Figure 1 and Figure 2 , the guide assembly 60 comprises a guide hole 61 and a guide column 62. The guide hole 61 is arranged on the support frame 50. The guide column 62 is connected to the first pressing plate 11, and the guide column 62 extends in the first direction and cooperates with the guide hole 61.

[0106] When the first pressing plate 11 is driven by the force source assembly 20, the guide column 62 will move smoothly along the guide hole 61. This design not only greatly improves the stability of the movement of the first pressing plate 11, but also effectively prevents detection errors caused by deviation or shaking. The addition of the guide assembly 60 makes the entire foreign matter detection device 100 more smooth in operation, and the detection result is more accurate and reliable.

[0107] In some optional embodiments, the guide assembly 60 is four, and is arranged at the four corner edges of the first pressing plate 11. In this way, the guide assembly 60 can provide stable support and guidance from multiple sides at the same time. When the first pressing plate 11 moves under the action of the driving force, the guide assembly 60 can effectively limit the left-right swinging and front-back shaking of the first pressing plate 11, thereby ensuring the stability and accuracy of the movement process. At the same time, the arrangement of the guide assembly 60 helps to enhance the uniformity and stability of the first pressing plate 11 during the pressing process.

[0108] Reference will be made to Figure 1 - Figure 6The foreign matter detection device 100 according to the embodiments of the utility model is described in detail with a specific embodiment. It is worth understanding that the following description is only exemplary and is not a specific limitation of the utility model.

[0109] Referring to Figure 1 and Figure 2 , the foreign matter detection device 100 comprises a pressing assembly 10, a force source assembly 20, a pressure meter 30, a vibration generator 40, a support frame 50 and a guide assembly 60.

[0110] Referring to Figures 3-5 , the pressing assembly 10 comprises a first pressing plate 11, a second pressing plate 12 and a third pressing plate 13.

[0111] The first pressing plate 11 and the second pressing plate 12 are arranged along a first direction to be disposed on opposite sides of the battery cell, and at least one of the first pressing plate 11 and the second pressing plate 12 is movable along the first direction to press and release the battery cell, and the pressing assembly 10 comprises a conductive part 14 for contacting the surface of the battery cell. The third pressing plate 13 is connected to the first pressing plate 11, and at least part of the third pressing plate 13 is located between the first pressing plate 11 and the second pressing plate 12 to press on the side of the battery cell.

[0112] The output end of the force source assembly 20 is connected to the first pressing plate 11 to drive it to move along the first direction.

[0113] Referring to Figure 2 and Figure 3 , the force source assembly 20 comprises a servo drive 22 and a pressure sensor 23. The pressure sensor 23 is arranged on the pressing assembly 10 to detect the pressure between the battery cell. The servo drive 22 is electrically connected to the pressure sensor 23 to adjust the driving force.

[0114] Referring to Figure 6 , the vibration generator 40 is connected to the second pressing plate 12.

[0115] The pressure meter 30 is electrically connected to the conductive part 14 and the battery cell.

[0116] The second pressing plate 12 is a composite plate 15.

[0117] The composite plate 15 comprises a support part 151, at least two sub-plates 152 and an elastic part 153. The at least two sub-plates 152 are arranged in sequence along the surface in contact with the battery cell.

[0118] The elastic part 153 is connected between each sub-plate 152 and the support part 151.

[0119] The elastic part 153 comprises a spring, and each sub-plate 152 is connected to the support part 151 by at least one spring.

[0120] The spring is a cylindrical spring, and the spring is arranged in a direction perpendicular to the partition plate 152, and the spring is a plurality of spaced apart springs.

[0121] The surface of each partition plate 152 facing the battery cell is provided with a conductive part 14.

[0122] The conductive part 14 includes a conductive tape 141 arranged in the first pressing plate 11 and the second pressing plate 12.

[0123] The conductive tape 141 is an adhesive tape and is adhered to the first pressing plate 11 and the second pressing plate 12.

[0124] The force source assembly 20, the pressure resistance instrument 30, and the second pressing plate 12 are mounted on the support frame 50.

[0125] The guide assembly 60 is arranged between the first pressing plate 11 and the support frame 50.

[0126] The guide assembly 60 includes a guide hole 61 and a guide column 62. The guide hole 61 is arranged on the support frame 50. The guide column 62 is connected to the first pressing plate 11, and the guide column 62 is arranged in an extending manner in a first direction and cooperates with the guide hole 61.

[0127] In the description of the present specification, the description referring to the terms “embodiment”, “example” and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0128] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A foreign matter detection device for a battery cell coating film, characterized in that, The application relates to a battery testing device. The device comprises: a pressing assembly, which comprises a first pressing plate and a second pressing plate arranged along a first direction to be arranged on opposite sides of a battery cell, at least one of the first pressing plate and the second pressing plate being movable along the first direction to press and release the battery cell, the pressing assembly comprising a conductive part for contacting a surface of the battery cell; a force source assembly connected to at least one of the first pressing plate and the second pressing plate to drive it to move along the first direction; a pressure resistance instrument electrically connected to the conductive part and the battery cell. At least one of the first pressing plate and the second pressing plate is a composite plate, which comprises: a support part; at least two sub-plates arranged along a surface in contact with the battery cell; 2. The foreign matter detecting device of the battery cell wrapping film according to claim 1, characterized by a spring connected between each sub-plate and the support part.

3. The foreign matter detecting device of the battery cell coating film according to claim 2, characterized by The spring is a cylindrical spring arranged along a direction perpendicular to the sub-plate, and the spring is a plurality of springs arranged at intervals.

4. The foreign matter detecting apparatus of the battery cell coating film according to claim 1, characterized by The surface of each sub-plate facing the battery cell is provided with the conductive part.

5. The foreign matter detecting apparatus of the battery cell coating film according to claim 1, characterized by The conductive part comprises a conductive tape arranged on at least one of the first pressing plate and the second pressing plate.

6. The foreign matter detecting device of the battery cell coating film according to claim 5, characterized by The conductive tape is an adhesive tape adhered to the first pressing plate and the second pressing plate.

7. The foreign matter detecting apparatus of the battery cell coating film according to claim 1, characterized by The pressing assembly further comprises a third pressing plate connected to at least one of the first pressing plate and the second pressing plate, at least a part of the third pressing plate being located between the first pressing plate and the second pressing plate to press on a side surface of the battery cell.

8. The foreign matter detecting apparatus of the battery cell coating film according to any one of claims 1 to 7, characterized by The device further comprises: a vibration generator; the force source assembly is connected to the first pressing plate, and the vibration generator is connected to the second pressing plate.

9. The foreign matter detecting apparatus of the battery cell coating film according to any one of claims 1 to 7, characterized by, The force source assembly comprises: a servo drive; a pressure sensor arranged on the pressing assembly to detect the pressure between the battery cell and the pressing assembly; the servo drive is electrically connected to the pressure sensor to adjust the driving force.

10. The foreign object detection apparatus of the battery cell coating film according to any one of claims 1 to 7, characterized by, The device further comprises: a support frame, wherein the force source assembly, the pressure resistance instrument, and the second pressing plate are mounted on the support frame, and the first pressing plate is connected to an output end of the force source assembly.

11. The foreign matter detecting device of the battery cell coating film according to claim 10, characterized by The device further comprises: a guide assembly arranged between the first pressing plate and the support frame, wherein the guide assembly comprises: a guide hole arranged on the support frame; a guide column connected to the first pressing plate, the guide column extending along the first direction and being matched with the guide hole.

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