Punching device, measuring device and battery production line

Abstract

The utility model discloses a punching device, a measuring device and a battery production line, the punching device comprises a punching head, a first driving unit, a weighing unit and a position identification unit, the first driving unit is connected with the punching head and is configured to drive the punching head to move, the weighing unit is arranged below the punching head, and the position identification unit is configured to identify the position of the punching head. The position identification unit is arranged on the punching head and is configured to identify a coating area on the pole piece. According to the scheme provided by the invention, the first driving unit drives the punching head to move, so that the position of the punching head corresponds to the position of the membrane, then the coated membrane is punched by utilizing the punching head, and the punched membrane falls onto the corresponding weighing unit to be weighed, so that punching and weighing of the membrane can be completed; the whole process is high in automation degree, and the weight measuring efficiency is effectively improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a punching device, a measuring device, and a battery production line. Background Technology

[0002] In the coating process of battery electrode manufacturing, positive and negative electrode sheets are formed by uniformly coating battery slurry onto a substrate. This process requires manual punching and measuring of the coated material. The small discs formed by punching are used to test the thickness or uniformity of the coating layer, while measuring these discs is used to inspect the overall quality of the coating.

[0003] The processes of punching and measuring small round pieces in related technologies are inefficient. Utility Model Content

[0004] In view of the above problems, this application provides a punching device, a measuring device, and a battery production line, which can solve the problem of low efficiency in the existing punching and measuring of small wafers.

[0005] To solve the above-mentioned technical problems, this application proposes a punching device, comprising:

[0006] Punching head;

[0007] A first driving unit is connected to the punching head and is configured to drive the punching head to move.

[0008] A weighing unit is disposed below the punching head;

[0009] A position recognition unit is disposed on the punching head and configured to identify the coating area on the electrode sheet.

[0010] In the technical solution of this application embodiment, the first driving unit drives the punching head to move so that the position of the punching head corresponds to the position of the film. Then, the punching head punches the coated film, and the punched film falls onto the corresponding weighing unit for weighing. Thus, the punching and weighing of the film can be completed. The overall process has a high degree of automation and effectively improves the weighing efficiency. At the same time, the position recognition unit identifies the coating differences on the film to ensure that the punching head is located in the corresponding coating area during punching.

[0011] In some embodiments, the position recognition unit is a color mark sensor, and the detection direction of the color mark sensor is aligned with the surface of the film. In this way, by aligning the color mark sensor with the surface of the film, the corresponding coating area can be easily identified.

[0012] In some embodiments, the punching device further includes an opening and closing unit disposed between the punching head and the weighing unit, configured to control the path of the punched component falling into the weighing unit. In this way, the opening and closing unit allows for convenient control of the path of the punched component.

[0013] In some embodiments, the opening and closing unit includes a base plate, a support rod, and a double door. The weighing unit and the support rod are both disposed on the side of the base plate facing the punching head, and the double door is disposed at the end of the support rod away from the base plate.

[0014] In this way, by controlling the opening and closing of the double doors, the punched parts can fall into the corresponding weighing unit.

[0015] In some embodiments, the punching device further includes a control unit, which is electrically connected to the double doors and the position recognition unit respectively;

[0016] After the control unit receives the identification signal from the position identification unit, the punching head completes the punching, and the control unit controls the double doors to open.

[0017] In this way, after receiving the identification signal, the control unit controls the punching head to complete the punching. At the same time, the control unit controls the double doors to open, so that the punched parts can fall into the corresponding weighing unit.

[0018] In some embodiments, the punching device further includes an alarm unit, which is electrically connected to the control unit;

[0019] If the position identification unit fails to identify the coating area, and / or if the punching head fails to reset after punching, the control unit controls the alarm unit to sound an alarm.

[0020] In this way, when the device malfunctions, the control unit will trigger an alarm, allowing staff to detect the abnormality promptly.

[0021] In some embodiments, the punching device further includes a second drive unit connected to the base plate and configured to drive the base plate to move. In this way, the second drive unit moves the base plate, synchronously moving the weighing unit, thereby ensuring the weighing unit is accurately positioned below the punching head.

[0022] This application also proposes a measuring device, including a weighing instrument, a length detection element, and a punching device as described in any one of the embodiments of this application;

[0023] The weighing instrument and the punching device are arranged sequentially along the diaphragm conveying direction; the weighing instrument is electrically connected to the weighing unit.

[0024] The length detection element is configured to measure the conveyor length of the coated film and control the start and stop of the film to keep the coated area of ​​the film at the measurement position of the weighing instrument.

[0025] In this way, the length of the conveyor belt of the coated film is measured by the length detection element, and the film automatically stops when it reaches the position of the weighing instrument in the coated area, so that the weighing instrument can weigh the film.

[0026] In some embodiments, the measuring device further includes a calibration unit configured to attach a mark to the diaphragm surface at the measurement location.

[0027] In this way, once the mark enters the sensing range of the color mark sensor, the entire device stops so that the punching head can punch the mark position.

[0028] This application also provides a battery production line, including a coating machine and a measuring device as described in the embodiments of this application;

[0029] The coating machine includes a winding mechanism, which is located downstream of the punching device along the film conveying direction.

[0030] 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

[0031] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the embodiments described 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:

[0032] Figure 1 This is a schematic diagram of the structure of the punching device provided in some embodiments of this application;

[0033] Figure 2 Schematic diagram of a control unit provided for some embodiments of this application;

[0034] Figure 3 A schematic diagram of a battery production line provided for some embodiments of this application.

[0035] The reference numerals in the detailed embodiments are as follows:

[0036] 100. Punching device; 200. Control unit; 300. Weighing instrument; 400. Winding mechanism; 10. Frame; 11. Punching head; 12. First drive unit; 121. First fixed base; 122. First motor; 123. First lead screw; 124. First bracket; 125. Second motor; 126. Second lead screw; 127. First pneumatic rod; 13. Weighing unit; 14. Position recognition unit; 15. Opening and closing unit; 151. Base plate; 152. Support rod; 153. Double door; 16. Second drive unit; 161. Second fixed base; 162. Third motor; 163. Third lead screw; 164. First slider; 165. Fourth motor; 166. Slide rail; 167. Fourth lead screw; 168. Second slider; 169. Second pneumatic rod. Detailed Implementation

[0037] 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.

[0038] 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 pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0039] In the description of the embodiments of this application, technical terms such as "first" and "second" 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.

[0040] 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.

[0041] 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 have an "or" relationship.

[0042] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0043] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0044] 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0045] In the coating process of manufacturing electrodes for power lithium batteries and energy storage batteries, positive and negative electrode sheets are formed by uniformly coating battery slurry onto a substrate. This process requires manual punching and measuring of the coated material. The small discs formed by punching are used to test the thickness or uniformity of the coating layer, while measuring these discs is used to check the overall quality of the coating.

[0046] However, manually cutting and measuring small discs is not only time-consuming and labor-intensive, but also inefficient.

[0047] Based on the above considerations, in order to solve the problem of low efficiency in the process of punching and measuring small discs, this application proposes a punching device, which includes a punching head, a first driving unit, a weighing unit, and a position recognition unit. The first driving unit is connected to the punching head and is configured to drive the punching head to move. The weighing unit is located below the punching head, and the position recognition unit is located on the punching head and is configured to recognize the coating area on the electrode.

[0048] In the technical solution of this application embodiment, the first driving unit drives the punching head to move so that the position of the punching head corresponds to the position of the film. Then, the punching head punches the coated film, and the punched film falls onto the corresponding weighing unit for weighing. Thus, the punching and weighing of the film can be completed. The overall process has a high degree of automation and effectively improves the weighing efficiency. At the same time, the position recognition unit identifies the coating differences on the film to ensure that the punching head is located in the corresponding coating area during punching.

[0049] According to some embodiments of this application, Figure 1 This is a schematic diagram of the punching device in this application. This application provides a punching device 100, which includes a punching head 11, a first driving unit 12, a weighing unit 13, and a position identification unit 14. The first driving unit 12 is connected to the punching head 11 and is configured to drive the punching head 11 to move. The weighing unit 13 is disposed below the punching head 11, and the position identification unit 14 is disposed on the punching head 11 and is configured to identify the coating area on the electrode sheet.

[0050] The first drive unit 12 in this embodiment includes a first fixed base 121, a first motor 122, a first lead screw 123, a first bracket 124, a second motor 125, a second lead screw 126, and a first pneumatic rod 127. Two first fixed bases 121 are fixedly positioned above the frame 10 at intervals along the Y-axis. Each first fixed base 121 is connected to a first motor 122, and each first fixed base 121 is rotatably connected to a first lead screw 123, which extends along the X-axis. The output shaft of the first motor 122 is connected to the corresponding first lead screw 123 via a coupling. The first bracket 124 has a gantry structure. The two ends of the first bracket 124 along the Y-axis are slidably connected to the corresponding first fixed bases 121 via slide rails and grooves. Simultaneously, the two ends of the first bracket 124 along the Y-axis are rotatably connected to the corresponding first lead screws 123 via threaded engagement.

[0051] The second motor 125 is fixed on the first bracket 124. The output shaft of the second motor 125 is connected to the second lead screw 126 through a connecting shaft. The second lead screw 126 extends along the Y-axis. The first air rod 127 and the first bracket 124 are slidably connected through a slide rail and slide groove cooperation structure. At the same time, the first air rod 127 and the corresponding second lead screw 126 are rotatably connected through a threaded cooperation.

[0052] The punching head 11 can be fixed to the first air rod 127 by bolts. In use, the first motor 122 drives the first lead screw 123 to rotate, the second motor 125 drives the second lead screw 126 to rotate, and the first air rod 127 drives the punching head 11 to move along the Z-axis, thereby realizing the movement of the punching head 11 in the three directions of X-axis, Y-axis and Z-axis.

[0053] It should be noted that the structure of the first drive unit described above is merely an example. Other alternative structures can also be used. For instance, the first drive unit may include multiple telescopic pneumatic rods, which drive the punching head to move in different directions. This application does not impose any special restrictions on the specific structure of the first drive unit, as long as the above structure can achieve the purpose of this application.

[0054] In this embodiment, the punching head 11 may include a punching blade and a mounting base. The punching blade can be fixed to the mounting base by bolts, and the mounting base can be connected to the first air rod 127 on the first drive unit 12 by bolts. This is not limited here. The material of the punching blade can be cemented carbide or high-speed steel, and the cutting edge shape of the punching blade can be determined according to the actual situation. This embodiment of the specification does not limit this.

[0055] In this embodiment, the weighing unit 13 can be an electronic balance, etc., which is not limited here.

[0056] In this embodiment, the position recognition unit 14 can be a color mark sensor, a light sensor, etc. The specific type can be determined according to the actual situation, and this specification does not limit it.

[0057] In this embodiment, the position identification unit 14 can be snapped onto or bolted to the punching head 11, which is not limited here.

[0058] In use, the first drive unit 12 drives the punching head 11 to move in the X, Y, and Z axes so that the position of the punching head 11 corresponds to the position of the diaphragm. Then, the first air spring 127 drives the punching head 11 to move downward in the Z-axis direction, punching the coated diaphragm. The punched diaphragm falls onto the corresponding weighing unit 13 for weighing, thus completing the punching and weighing of the diaphragm. The overall process is highly automated and effectively improves the weighing efficiency. At the same time, when the coated diaphragm is conveyed to the area below the punching head 11, the position recognition unit 14 identifies the coating differences on the diaphragm to ensure that the punching head 11 is located in the corresponding coating area during punching.

[0059] According to some embodiments of this application, the position recognition unit 14 is a color mark sensor, and the detection direction of the color mark sensor is aligned with the surface of the diaphragm.

[0060] In this embodiment, the color mark sensor can be bolted to the punching head 11, and the detection direction of the color mark sensor is aligned with the surface of the film. When the coated film is conveyed below the punching head 11, the corresponding coating area can be easily identified by aligning the color mark sensor with the surface of the film.

[0061] According to some embodiments of this application, the punching device further includes an opening and closing unit 15, which is disposed between the punching head 11 and the weighing unit 13 and is configured to control the part punched by the punching head 11 to fall into the channel of the weighing unit 13.

[0062] In this embodiment, the opening and closing unit 15 can be a double door, a folding door, etc., and is not limited here.

[0063] In this embodiment, the opening and closing unit 15 can be bolted to the frame 10. In the initial state, the opening and closing unit 15 is closed. Then, the cylinder drives the opening and closing unit 15 to rise and contact the diaphragm before stopping. At this time, the first air rod 127 drives the punching head 11 to move downward in the Z-axis direction. The punching head 11 punches the coated diaphragm. After punching is completed, the opening and closing unit 15 opens. At this time, the punched diaphragm will fall into the corresponding weighing unit 13 for weighing.

[0064] According to some embodiments of this application, such as Figure 1 As shown, the opening and closing unit 15 includes a base plate 151, a support rod 152 and a double door 153. The weighing unit 13 and the support rod 152 are both located on the side of the base plate 151 facing the punching head 11, and the double door 153 is located at the end of the support rod 152 away from the base plate 151.

[0065] In this embodiment, the support rod 152 can be threadedly connected to the upper surface of the base plate 151, and the double door 153 is connected to the upper end of the support rod 152.

[0066] The double-door structure 153 in this embodiment can be an existing automatic double-door structure, which will not be described in detail here.

[0067] In the initial state, the double doors 153 are closed. The base plate 151 is raised by the cylinder. After the double doors 153 contact the diaphragm, the rising stops. At this time, the first air rod 127 drives the punching head 11 to move downward in the Z-axis direction. The punching head 11 punches the coated diaphragm. After punching is completed, the double doors 153 open, and the punched diaphragm falls onto the corresponding weighing unit 13 for weighing. In this way, by controlling the opening and closing of the double doors 153, the punched part can be made to fall onto the corresponding weighing unit 13.

[0068] According to some embodiments of this application, such as Figure 2 and combined Figure 1 As shown, the punching device also includes a control unit 200, which is electrically connected to the double door 153 and the position recognition unit 14 respectively.

[0069] After the control unit 200 receives the identification signal from the position identification unit 14, the punching head 11 completes the punching, and the control unit 200 controls the double door 153 to open.

[0070] The control unit 200 in this embodiment can be an industrial computer, microprocessor, etc., and is not limited here.

[0071] The specific working principle of the control unit 200 in this embodiment is as follows:

[0072] First, the position recognition unit 14 scans the film coating area in real time. When it detects that the target coating area has moved precisely below the punching head 11, it immediately generates a high-level recognition signal, which is transmitted to the control unit 200 via a wired communication interface. The control unit 200 has a built-in signal processing circuit that filters and amplifies the received raw signal to eliminate noise caused by environmental interference and ensure the accuracy of signal transmission.

[0073] Secondly: the control unit 200 controls the punching head 11 to complete the punching;

[0074] Subsequently, the control unit 200 sends precise control commands to the drive source of the double doors 153. These commands are transmitted in the form of electrical signals. If the drive component is a cylinder, a solenoid valve control signal is output to control the cylinder to pneumatically open the double doors; if it is a motor, a pulse signal is output to control the motor's rotation angle, ensuring smooth opening of the double doors. Simultaneously, the control unit 200 receives real-time position feedback signals from the double doors 153. After confirming that the doors are fully open, it maintains the open state for a preset time (e.g., 2 seconds, adapting to the component's descent time). Once the component falls onto the weighing unit 13, a closing command is automatically sent, completing one full linkage cycle.

[0075] According to some embodiments of this application, the punching device further includes an alarm unit (not shown in the figure), which is electrically connected to the control unit 200; when the position identification unit 14 fails to identify the coating area, and / or when the punching head 11 fails to reset after completing the punching, the control unit 200 controls the alarm unit to sound an alarm.

[0076] The alarm unit in this embodiment can be an audible and visual alarm, etc., and is not limited here.

[0077] When in use, if the position identification unit 14 fails to identify the coating area, or if the punching head 11 fails to reset after punching, or if the position identification unit 14 fails to identify the coating area and the punching head 11 fails to reset after punching, the control unit 200 will control the alarm unit to sound an alarm so that staff can detect the abnormality in a timely manner.

[0078] According to some embodiments of this application, the punching device further includes a second drive unit 16, which is connected to the base plate 151 and configured to drive the base plate 151 to move.

[0079] The second drive unit 16 in this embodiment may include a second fixed base 161, a third motor 162, a third lead screw 163, a first slider 164, a fourth motor 165, a slide rail 166, a fourth lead screw 167, a second slider 168, and a second pneumatic rod 169. Two second fixed bases 161 are fixedly spaced along the Y-axis on the bottom surface of the frame 10. Each second fixed base 161 is connected to a third motor 162, and each second fixed base 161 is rotatably connected to a third lead screw 163, which extends along the X-axis. The output shaft of the third motor 162 is connected to the corresponding third lead screw 163 via a coupling. The first slider 164 is threadedly connected to the third lead screw 163 and slidably connected to the second fixed base 161, allowing the first slider 164 to slide relative to the second fixed base 161 along the X-axis.

[0080] The fourth motor 165 is fixed to the corresponding first slider 164 by bolts. The two ends of the slide rail 166 along the Y-axis direction are fixed to the two first sliders 164. The second slider 168 is slidably connected to the slide rail 166. The second slider 168 can slide relative to the slide rail 166 along the Y-axis direction. The output shaft of the fourth motor 165 is connected to the fourth lead screw 167 through a connecting shaft. The fourth lead screw 167 extends along the Y-axis direction, and the fourth lead screw 167 and the corresponding second slider 168 are connected by an internal thread and an external thread structure. The second slider 168 is connected to the second air rod 169 by bolts. The telescopic end of the second air rod 169 is connected to the base plate 151 by bolts.

[0081] In use, the third motor 162 drives the third lead screw 163 to rotate, and the fourth motor 165 drives the fourth lead screw 167 to rotate, thereby enabling the second slider 168 to move in the X and Y axis directions. The second pneumatic rod 169 drives the base plate 151 to move in the Z axis direction, thereby adjusting the position of the corresponding weighing unit 13, so that the weighing unit 13 is accurately located below the punching head 11.

[0082] It should be noted that the structure of the second drive unit described above is merely an example. Other alternative structures can also be used. For instance, the second drive unit may include multiple telescopic pneumatic rods, which drive the base plate to move in different directions. This application does not impose any special restrictions on the specific structure of the second drive unit, as long as the above structure achieves the purpose of this application.

[0083] This application also provides a measuring device, such as Figure 3 and combined with Figure 1 As shown, the measuring device includes a weighing instrument 300, a length detection element, and a punching device as described in any of the embodiments of this application. The weighing instrument 300 and the punching device are arranged sequentially along the film conveying direction. The weighing instrument 300 is electrically connected to the weighing unit 13. The length detection element is configured to measure the conveying length of the coated film and control the start and stop of the film to stop the coated area of ​​the film at the measuring position of the weighing instrument 300.

[0084] In this embodiment, the weighing instrument 300 calculates the corresponding weight value using the function Y=KX+B. The weighing instrument 300 internally includes a microprocessor, a memory chip, and a weighing sensor. X represents the raw signal value output by the weighing sensor, typically in millivolts (mV), volts (V), digital quantities (counts), or other internal engineering units. This is a raw electrical signal proportional to the weight, but uncalibrated.

[0085] The physical meaning of Y is: the actual weight of the electrode membrane to be measured. Its unit is usually grams (g), milligrams (mg), or grams per square meter (g / m²).

[0086] The physical meaning of K (slope, calibration coefficient) is the sensitivity of the sensor. It represents "how much weight change corresponds to a unit change in electrical signal". Its unit is g / mV or mg / count. K is the core of the function, determining the measurement range and accuracy. A large K value means the sensor is not sensitive to weight changes, while a small K value means the sensor is very sensitive.

[0087] B (intercept, zero offset) physically represents the tare weight or zero-point value of the system. It represents the weight corresponding to the signal value output by the sensor when there is nothing on the weighing pan (i.e., the target weight should be 0). Its unit is the same as Y, such as grams (g). The purpose of B is to eliminate the influence of tare weight. For example, even if the weighing pan is empty, the sensor may output a 100mV signal due to its own weight. B is used to cancel out the spurious weight corresponding to this 100mV.

[0088] The corresponding X value is read by the microprocessor (CPU), and the storage chip stores the unique parameters K and B obtained through previous calibration. These parameters are written before leaving the factory or during user calibration and are stored long-term.

[0089] The microprocessor then reads K and B from the memory chip, and uses Y=KX+B to calculate the corresponding weight value.

[0090] After the coated membrane is weighed by the weighing instrument 300, the corresponding X value is read. After the punched membrane is weighed by the weighing unit 13, the corresponding Y value is obtained. By calculating multiple sets of X and Y values, the corresponding K and B values ​​can be calculated according to Y=KX+B, thereby realizing the recalibration of the weighing instrument 300K and B.

[0091] The length detection element in this embodiment can be a meter sensor, a distance sensor, etc., and is not limited here.

[0092] In this embodiment, the length detection element can be fixed on the conveyor roller of the coating machine. The length detection element measures the length of the film after coating. When the coating area of ​​the film is located at 300 on the weighing instrument, the length detection element sends the corresponding signal to the motor on the conveyor roller, and the motor controls the conveyor roller to stop rotating.

[0093] After the weighing instrument 300 completes the measurement, the length detection element measures the length of the coated film again. After the film is located in the corresponding punching area, the punching head 11 completes the punching.

[0094] According to some embodiments of this application, the measuring device further includes a calibration unit configured to attach a mark to the diaphragm surface at the measurement location.

[0095] The calibration unit in this embodiment can be a film holder, an adhesive roller, and a driving component. The driving component is a motor or a cylinder used to drive the adhesive roller to press the film surface and attach the adhesive material on the film holder to the measurement position. The specific components can be determined according to the actual situation, and this embodiment does not limit them.

[0096] In this embodiment, a mark is pasted on the surface of the diaphragm at the measurement position by a calibration unit. When the mark enters the sensing range of the color mark sensor, the whole device stops so that the punching head can punch the mark position.

[0097] This application also provides a battery production line, including a coating machine and a measuring device as described in the embodiments of this application; wherein, as Figure 3 The coating machine shown includes a winding mechanism 400, which is located downstream of the punching device 100 along the film conveying direction.

[0098] The specific structure of the measuring device in this embodiment refers to that in the above embodiments. Since the battery production line adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. 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 they should all be covered within the scope of the claims and specification of 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 the claims.

Claims

1. A punching device, characterized in that, include: Punching head; A first driving unit is connected to the punching head and is configured to drive the punching head to move. A weighing unit is disposed below the punching head; A position recognition unit is disposed on the punching head and configured to identify the coating area on the electrode sheet.

2. The punching device according to claim 1, characterized in that, The position recognition unit is a color mark sensor, and the detection direction of the color mark sensor is aligned with the surface of the diaphragm.

3. The punching device according to claim 1 or 2, characterized in that, The punching device further includes an opening and closing unit, which is disposed between the punching head and the weighing unit and is configured to control the part punched by the punching head to fall into the channel of the weighing unit.

4. The punching device according to claim 3, characterized in that, The opening and closing unit includes a base plate, a support rod, and a double door. The weighing unit and the support rod are both located on the side of the base plate facing the punching head, and the double door is located on the end of the support rod away from the base plate.

5. The punching device according to claim 4, characterized in that, The punching device also includes a control unit, which is electrically connected to the double doors and the position recognition unit respectively. After the control unit receives the identification signal from the position identification unit, the punching head completes the punching, and the control unit controls the double doors to open.

6. The punching device according to claim 5, characterized in that, The punching device also includes an alarm unit, which is electrically connected to the control unit; If the position identification unit fails to identify the coating area, and / or if the punching head fails to reset after punching, the control unit controls the alarm unit to sound an alarm.

7. The punching device according to claim 4, characterized in that, The punching device further includes a second drive unit, which is connected to the base plate and configured to drive the base plate to move.

8. A measuring device, characterized in that, Includes a weighing instrument, a length detection element, and a punching device as described in any one of claims 1 to 7; The weighing instrument and the punching device are arranged sequentially along the diaphragm conveying direction; the weighing instrument is electrically connected to the weighing unit. The length detection element is configured to measure the conveyor length of the coated film and control the start and stop of the film to keep the coated area of ​​the film at the measurement position of the weighing instrument.

9. The measuring device according to claim 8, characterized in that, The measuring device further includes a calibration unit configured to affix markings to the diaphragm surface at the measurement location.

10. A battery production line, characterized in that, Includes a coating machine and a measuring device as claimed in claim 8 or 9; The coating machine includes a winding mechanism, which is located downstream of the punching device along the film conveying direction.

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