Cold pressing device, pole piece production equipment and battery production system

Abstract

The embodiment of the utility model provides a cold pressing device, pole piece production equipment and a battery production system. The cold pressing device is used in a cold pressing process of a pole piece. The cold pressing device comprises a cold pressing mechanism, a tension mechanism, a detection unit and a control unit. The cold pressing mechanism comprises at least one pair of rollers used for cold pressing of the pole pieces. The tension mechanism comprises at least one tension roller which is used for applying tension to the pole piece. And a detection unit is arranged at the downstream of at least one of the tension mechanism and the cold pressing mechanism and is used for detecting three-dimensional shape information of the pole piece. The control unit is connected with the detection unit, at least one of the cold pressing mechanism and the tension mechanism is connected with the control unit, and the control unit is used for controlling the tension of the tension mechanism and / or the pressure of the cold pressing mechanism according to the three-dimensional shape information of the pole piece. The production quality of the pole piece can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a cold pressing apparatus, electrode production equipment, and battery production system. Background Technology

[0002] Battery cells are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] In the development of battery technology, improving the production quality of electrode sheets is a research direction. Utility Model Content

[0004] This application provides a cold pressing apparatus, electrode production equipment, and battery production system, which can improve the production quality of electrodes.

[0005] This application provides a cold pressing apparatus for use in the cold pressing process of electrode sheets. The cold pressing apparatus includes a cold pressing mechanism, a tensioning mechanism, a detection unit, and a control unit. The cold pressing mechanism includes at least one pair of rollers for cold pressing the electrode sheet. The tensioning mechanism includes at least one tension roller for applying tension to the electrode sheet. A detection unit is located downstream of at least one of the tensioning mechanism and the cold pressing mechanism for detecting the three-dimensional morphology information of the electrode sheet. The control unit is connected to the detection unit, and at least one of the cold pressing mechanism and the tensioning mechanism is connected to the control unit. The control unit is used to control the tension of the tensioning mechanism and / or the pressure of the cold pressing mechanism based on the three-dimensional morphology information of the electrode sheet.

[0006] In the above technical solution, the cold pressing device of this embodiment uses a detection unit to detect the three-dimensional morphology information of the electrode sheet, thereby obtaining the elongation of the tab region. When the elongation does not meet the requirements, the pressure of the cold pressing mechanism and / or the tension of the tension mechanism are controlled according to the elongation to ensure that the elongation of the tab region meets the requirements. The elongation obtained in this way is more accurate and reflects the quality status of the tab region on the production line in real time. When the elongation does not meet the requirements, the elongation can be quickly adjusted, improving the production quality of the electrode sheet, effectively reducing batch quality risks, and increasing the product qualification rate.

[0007] In some embodiments, the cold pressing mechanism includes a first drive member, at least one of two paired rollers is connected to the first drive member, the first drive member is used to drive one roller to move closer to or away from the other roller to adjust the pressure of the roller on the electrode sheet; a control unit is connected to the first drive member and is used to control the first drive member to adjust the pressure of the roller.

[0008] In the above technical solution, the pressure on the electrode sheet is adjusted by driving the roller through the first driving component, which is more convenient and has higher adjustment accuracy.

[0009] In some embodiments, the cold pressing mechanism further includes a pressure sensor disposed on the roll and connected to the control unit. The pressure sensor is used to monitor the pressure of the roll on the electrode and to provide feedback to the control unit.

[0010] In the above technical solution, the control unit sends a pressure adjustment command to the first drive unit, which drives the roller to apply corresponding pressure to the electrode sheet. At this time, the pressure sensor feeds back the pressure data to the control unit. The control unit compares the pressure data with the set pressure value. If there is a large deviation between the detected pressure value and the set pressure value, the control unit can also correct the first drive unit, thereby realizing closed-loop verification and improving the accuracy and stability of pressure adjustment.

[0011] In some embodiments, the detection unit is located downstream of the cold pressing mechanism and the tensioning mechanism.

[0012] In the above technical solution, since both the cold pressing mechanism and the tension mechanism will cause changes in the elongation of the electrode sheet, a detection unit can be set up to monitor the changes in elongation, which saves costs and is more efficient.

[0013] In some embodiments, the cold pressing device includes multiple sets of cold pressing units, each set of cold pressing units including a detection unit and a cold pressing mechanism and a tensioning mechanism located upstream of the detection unit, and the multiple sets of cold pressing units are configured to be arranged sequentially along the direction of the electrode sheet.

[0014] In the above technical solution, multiple cold pressing units are set up, and each cold pressing unit is equipped with a detection unit. In this way, multiple cold pressing of the electrode sheet and multiple monitoring of the corresponding elongation rate can be realized, thereby further improving the cold pressing quality of the electrode sheet.

[0015] In some embodiments, the tension mechanism includes a first tension roller and a second tension roller, the second tension roller being located downstream of the first tension roller, a cold pressing mechanism being located between the first tension roller and the second tension roller, and a detection unit being located downstream of the second tension roller.

[0016] In the above technical solution, when the electrode enters the cold pressing mechanism, the upstream first tension roller provides front tension to help the electrode enter the roll smoothly, and the downstream second tension roller provides back tension to control the elongation and shape after rolling. The combined action of the first tension roller and the second tension roller can suppress uneven deformation of the electrode.

[0017] In some embodiments, the detection unit includes a 3D profilometer.

[0018] In the above technical solution, the detection unit is set as a 3D profilometer, which can accurately measure the three-dimensional morphological information of the tab area and / or coating area.

[0019] In some embodiments, the cold pressing device includes an alarm component connected to a control unit. The detection unit is used to detect at least the three-dimensional morphological information of the coating area of ​​the electrode. The control unit is used to send an alarm command to the alarm component based on the three-dimensional morphological information of the coating area.

[0020] In the above technical solution, the thickness of the coating area of ​​the electrode can be monitored, and measures can be taken in time when the thickness of the coating area does not meet the requirements, thereby improving the cold pressing quality of the electrode.

[0021] In some embodiments, the alarm components include a sound alarm and / or a light alarm.

[0022] In the above technical solution, the alarm component is set as a sound alarm and / or a light alarm, which has a more obvious warning effect.

[0023] Secondly, embodiments of this application also provide an electrode production apparatus, including the aforementioned cold pressing device and coating device, wherein the coating device is located upstream of the cold pressing device and is used to coat an active material layer on a substrate to form a coating area of ​​the electrode.

[0024] Thirdly, embodiments of this application also provide a battery production system, including the aforementioned cold pressing device or the aforementioned electrode production equipment. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0026] Figure 1 A schematic diagram of the structure of a cold pressing device provided in some embodiments of this application;

[0027] Figure 2 This is a partial structural schematic diagram of a cold pressing device provided in some embodiments of this application;

[0028] Figure 3 This is a schematic diagram of the structure of the cold pressing mechanism in the cold pressing apparatus provided in some embodiments of this application;

[0029] Figure 4 This is another structural schematic diagram of the cold pressing device provided in some embodiments of this application.

[0030] The reference numerals in the accompanying drawings for the specific embodiments are as follows:

[0031] 100. Cold pressing device; 200. Electrode sheet;

[0032] 1. Cold pressing mechanism; 11. Roller; 12. First driving component; 13. Pressure sensor;

[0033] 2. Tension mechanism; 21. First tension roller; 22. Second tension roller;

[0034] 3. Detection unit;

[0035] 4. Control unit;

[0036] 5. Alarm components. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0039] In this application, the reference to "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 in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0041] 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, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0042] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0043] In this application, "multiple" means two or more (including two).

[0044] In this application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0045] A single battery cell includes electrode components and an electrolyte. The electrode components include a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes. The positive electrode includes a positive current collector and a positive active material layer, which is coated on the surface of the positive current collector. The positive current collector includes a positive electrode coating area and a positive electrode tab connected to the coating area. The coating area is coated with the positive active material layer, while the tab is not. Taking a lithium-ion battery cell as an example, the positive current collector can be made of aluminum, and the positive active material layer includes the positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative current collector and a negative active material layer, the negative active material layer being coated on the surface of the negative current collector. The negative current collector includes a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area. The negative electrode coating area is coated with the negative active material layer, while the negative electrode tab is not coated with the negative active material layer. The material of the negative current collector can be copper, and the negative active material layer includes negative active material, which can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0046] In the manufacturing process of battery cells, the electrodes are typically cold-pressed. Cold pressing increases the density of the electrodes, reduces porosity, and thus improves the energy density and power density of the material. Furthermore, it makes the electrode thickness more uniform, improving the consistency and stability of the battery cell during use. Additionally, it increases the elongation of the tabs, a key indicator of cold-pressing quality; a suitable elongation improves the conductivity and weldability of the tabs.

[0047] In related technologies, a micrometer is typically used to randomly sample tabs for thickness measurement to estimate elongation. However, the data obtained using this method cannot reflect the real-time quality status of the tabs on the production line, nor can it guide parameter adjustments during the production process in a timely manner, which can easily lead to batches of defective products.

[0048] In view of this, this application provides a cold pressing device in which a detection unit detects the three-dimensional morphological information of the electrode sheet to obtain the elongation of the tab region, and controls the pressure of the cold pressing mechanism and / or the tension of the tension mechanism according to the elongation to ensure that the elongation of the tab region meets the requirements. This method of obtaining the elongation of the tab is more accurate and reflects the quality status of the electrode sheets on the production line in real time, allowing for timely adjustments and effectively reducing batch quality risks, thereby improving product quality and pass rate.

[0049] Figure 1 This is a schematic diagram of the structure of a cold pressing device provided in some embodiments of this application. Figure 2 This is a partial structural schematic diagram of a cold pressing device provided in some embodiments of this application.

[0050] like Figure 1 and Figure 2 As shown, this application also provides a cold pressing apparatus 100, which is used in the cold pressing process of electrode 200. The cold pressing apparatus 100 includes a cold pressing mechanism 1, a tension mechanism 2, a detection unit 3, and a control unit 4. The cold pressing mechanism 1 includes at least one pair of rollers 11 for cold pressing the electrode. The tension mechanism 2 includes at least one tension roller for applying tension to the electrode 200. A detection unit 3 is located downstream of at least one of the tension mechanism 2 and the cold pressing mechanism 1, and the detection unit 3 is used to detect the three-dimensional morphological information of the electrode. The control unit 4 is connected to the detection unit 3, and at least one of the cold pressing mechanism 1 and the tension mechanism 2 is connected to the control unit 4. The control unit 4 is used to control the pressure of the cold pressing mechanism 1 and / or the tension of the tension mechanism 2 according to the three-dimensional morphological information of the electrode.

[0051] The electrode includes a tab region and a coating region, the coating region being coated with an active material layer.

[0052] The cold pressing mechanism 1 of this embodiment includes at least one pair of rollers 11, each pair of rollers 11 applying pressure to the electrode 200 from both sides. Exemplarily, each pair of rollers 11 includes an upper roller and a lower roller, at least one of which can move towards or away from the other to adjust the pressure of the rollers 11 on the electrode 200. The rollers 11 cold press both the tab area and the coating area.

[0053] The tension mechanism 2 in this embodiment includes at least one tension roller, which applies tension to both the tab area and the coating area. The tension roller mainly adjusts the tension on the electrode 200 by moving its position.

[0054] In this embodiment, one of the tension mechanism 2 and the cold pressing mechanism 1 can be located upstream of the other. Along the traveling direction of the electrode 200, the detection unit 3 can be located between the tension mechanism 2 and the cold pressing mechanism 1, or downstream of the tension mechanism 2 and the cold pressing mechanism 1. For example, the number of detection units 3 is at least two, with the tension mechanism 2, one of the detection units 3, the cold pressing mechanism 1, and the other detection unit 3 arranged sequentially along the traveling direction of the electrode 200. For example, the number of detection units 3 is one, with the tension mechanism 2, the cold pressing mechanism 1, and the detection unit 3 arranged sequentially along the traveling direction of the electrode 200.

[0055] In the embodiments of this application, "upstream" and "downstream" as mentioned above and below refer to the first and last along the direction of electrode travel, respectively, and do not limit the spatial position between the components.

[0056] In this embodiment, the detection unit 3 is used to detect the three-dimensional topographic information of the tab region and / or the coating region. The three-dimensional topographic information refers to the positional information of each point in the tab region and / or the coating region. This positional information is linked together to form a topographic model of the tab region and / or the coating region. After processing by the control unit 4, the elongation of the tab region can be obtained. It should be noted that the length data of the tab region obtained solely by the camera is two-dimensional topographic information. For bent electrodes, three-dimensional topographic information is more accurate than two-dimensional topographic information.

[0057] In this embodiment, the detection unit 3 can be a 3D profilometer, a laser scanner, or a lidar, etc. Among them, the laser scanner uses a laser beam to scan the surface of the object, which can acquire three-dimensional shape data with high precision.

[0058] In this embodiment, the control unit 4 is a PLC controller, but it can also be a host computer, a microcontroller, or other control circuit or module capable of implementing control functions, but is not limited thereto. For example, the control unit 4 can process the point cloud data collected by the detection unit 3 using a point cloud processing algorithm to obtain the elongation of the tab region.

[0059] For example, the elongation E is calculated as E = (L - L0) / L0, where L is the current length of the tab and L0 is the initial length of the tab.

[0060] In this embodiment, after the control unit 4 calculates the elongation of the tab region, if the actual elongation is not within the preset elongation range, the control unit 4 adjusts the pressure of the cold pressing mechanism 1 on the electrode 200, thereby adjusting the elongation of the tab region to conform to the preset elongation range. Alternatively, the control unit 4 adjusts the tension of the tension mechanism 2 on the electrode 200, thereby making the elongation of the tab region conform to the preset elongation range. Or, both can be adjusted simultaneously to make the elongation of the tab region conform to the preset elongation range.

[0061] For example, the control unit 4 uses the ICP (Iterative Closest Point) algorithm to register the point cloud data of the acquired electrode sheet, reducing potential positional deviations caused by the electrode tabs during transmission and improving the accuracy of subsequent data analysis. The control unit 4 calculates the elongation of the electrode tab region using a point cloud processing algorithm and compares it with a set standard elongation to determine if the elongation of the electrode tab region is within the acceptable range. If it is not within the acceptable range, based on a fuzzy PID algorithm and considering the current elongation deviation of the electrode tab region, it generates adjustment commands for the cold pressing mechanism 1 and / or the tension mechanism 2 to adjust the elongation of the electrode tab region.

[0062] In this embodiment, at least one of the cold pressing mechanism 1 and the tensioning mechanism 2 can be connected to the control unit 4 via a wired connection or a wireless connection. The same applies to the control unit 4 and the detection unit 3.

[0063] In this embodiment, the cold pressing device 100 uses a detection unit 3 to detect the three-dimensional morphology information of the electrode sheet, thereby determining the elongation of the tab region. When the elongation does not meet the requirements, the pressure of the cold pressing mechanism 1 and / or the tension of the tension mechanism 2 are controlled according to the elongation to ensure that the elongation of the tab region meets the requirements. This method yields a more accurate elongation and reflects the quality status of the tab region on the production line in real time. When the elongation does not meet the requirements, it allows for rapid adjustment, improving the production quality of the electrode sheet.

[0064] In some embodiments, the cold pressing mechanism 1 includes a first driving member 12, at least one of two paired rollers 11 is connected to the first driving member 12, the first driving member 12 is used to drive one roller 11 to move closer to or away from the other roller 11 to adjust the pressure of the roller 11 on the electrode 200; the control unit 4 is connected to the first driving member 12 and is used to control the first driving member 12 to adjust the pressure of the roller 11.

[0065] The first driving component 12 in this embodiment can be a servo motor or a cylinder, hydraulic cylinder, or other components.

[0066] Exemplarily, the pressure of the cold pressing roller can be adjusted by the formula F2 = F1 - k×ΔE (where k = 10 N / %), which represents the dynamic adjustment logic of the cold pressing roller pressure. The core is to real-time correct the pressure value (F) applied by the rolling roller 11 through the product of the elongation rate deviation (ΔE) and the fixed gain coefficient (k), so as to achieve the closed-loop control of the elongation rate.

[0067] Among them, ΔE represents the elongation rate deviation of the tab area, which is the difference between the measured elongation rate (E) and the target elongation rate (E0), that is, ΔE = E - E0; k represents the gain coefficient, which is the pressure adjustment amount corresponding to the unit elongation rate deviation, and the value here is 10 N / %, that is, a pressure adjustment of 10 N is required for every 1% deviation; F2 represents the pressure of the adjusted rolling roller 11; F1 represents the pressure of the rolling roller 11 before adjustment. Among them, the target elongation rate is a preset elongation rate, which can be determined according to the material and usage requirements of the pole piece.

[0068] Exemplarily, when it is detected that the elongation rate deviation ΔE exceeds the threshold value (1.5%), the pressure is quickly corrected through linear proportional regulation to make the elongation rate return to the target range.

[0069] If ΔE is positive (the measured elongation rate is higher than the target elongation rate), the pressure needs to be reduced (F2 < F1) to prevent over-stretching of the tab;

[0070] If ΔE is negative (the measured elongation rate is lower than the target elongation rate), the pressure needs to be increased (F2 > F1) to make the elongation rate meet the standard.

[0071] The rolling roller 11 is driven by the first driving member 12 to adjust the pressure on the pole piece, which is more convenient to adjust and has higher adjustment accuracy.

[0072] Figure 3 It is a schematic structural diagram of the cold pressing mechanism in the cold pressing device provided by some embodiments of the present application.

[0073] Please refer to Figure 3 , in some embodiments, the cold pressing mechanism 1 further includes a pressure sensor 13. The pressure sensor 13 is disposed on the rolling roller 11 and is connected to the control unit 4. The pressure sensor 13 is used to monitor the pressure of the rolling roller 11 on the pole piece 200 and feedback to the control unit 4.

[0074] In this embodiment, the pressure sensor 13 can be disposed on the rolling roller 11 connected to the first driving member 12, or can be disposed on the rolling roller 11 not connected to the first driving member 12. Optionally, the pressure sensor 13 is disposed on the rolling roller 11 connected to the first driving member 12.

[0075] Exemplarily, the connection between the pressure sensor 13 and the control unit 4 can be a wired connection or a wireless connection.

[0076] Control unit 4 sends a pressure adjustment command to first drive unit 12. First drive unit 12 drives roller 11 to apply corresponding pressure to electrode 200. At this time, pressure sensor 13 feeds back pressure data to control unit 4. Control unit 4 compares the pressure data with the set pressure value. If the detected pressure value deviates significantly from the set pressure value, control unit 4 can also correct first drive unit 12, thereby achieving closed-loop verification and improving the accuracy and stability of pressure adjustment.

[0077] In some embodiments, the detection unit 3 is located downstream of the cold pressing mechanism 1 and the tension mechanism 2.

[0078] In this embodiment, the detection unit 3 is located downstream of both the cold pressing mechanism 1 and the tension mechanism 2.

[0079] Since both the cold pressing mechanism 1 and the tension mechanism 2 can cause changes in the elongation of the electrode 200, a detection unit 3 can be set up to monitor the changes in elongation, saving costs and being more efficient.

[0080] Figure 4 This is another structural schematic diagram of the cold pressing device provided in some embodiments of this application.

[0081] Please see Figure 4 In some embodiments, the cold pressing device 100 includes multiple sets of cold pressing units, each set of cold pressing units including a detection unit 3 and a cold pressing mechanism 1 and a tension mechanism 2 located upstream of the detection unit 3, and the multiple sets of cold pressing units are configured to be arranged sequentially along the direction of the electrode 200.

[0082] In this embodiment, multiple sets of cold pressing units are arranged sequentially along the direction of the electrode 200, that is, in two adjacent sets of cold pressing units, one set of cold pressing units is located upstream of the other set of cold pressing units.

[0083] Optionally, each cold pressing unit includes a detection unit 3, a cold pressing mechanism 1, and a tension mechanism 2 located upstream of the detection unit 3.

[0084] Multiple cold pressing units are set up, and each cold pressing unit is equipped with a detection unit 3. In this way, multiple cold pressings of the electrode 200 and the corresponding elongation rate can be monitored multiple times, thereby further improving the cold pressing quality of the electrode 200.

[0085] In some embodiments, the tension mechanism 2 includes a first tension roller 21 and a second tension roller 22, the second tension roller 22 being located downstream of the first tension roller 21, the cold pressing mechanism 1 being located between the first tension roller 21 and the second tension roller 22, and the detection unit 3 being located downstream of the second tension roller 22.

[0086] In this embodiment, the cold pressing mechanism 1 is located between the first tension roller 21 and the second tension roller 22, that is, in the traveling direction of the electrode 200, the cold pressing mechanism 1 is located downstream of the first tension roller 21 and upstream of the second tension roller 22.

[0087] With this configuration, when the electrode 200 enters the cold pressing mechanism 1, the upstream first tension roller 21 provides forward tension to help the electrode 200 smoothly enter the roll 11, while the downstream second tension roller 22 provides backward tension to control the elongation and shape after rolling. The combined action of the first tension roller 21 and the second tension roller 22 can suppress uneven deformation of the electrode 200. Furthermore, after cold pressing, the plastic deformation of the electrode 200 is basically completed. By applying differentiated tension through the downstream second tension roller 22, the secondary elongation of the tab region can be controlled, reducing the elongation difference with the film region.

[0088] In some embodiments, the detection unit 3 includes a 3D profilometer.

[0089] For example, the 3D profilometer uses line laser or structured light technology to scan the surface of the electrode 200 to obtain three-dimensional morphological data of the electrode 200, with a resolution of not less than 10μm.

[0090] The detection unit 3 is set as a 3D profilometer, which can accurately measure the three-dimensional morphology information of the tab area and / or coating area.

[0091] In some embodiments, the cold pressing device 100 includes an alarm component 5, which is connected to the control unit 4. The detection unit 3 is used to detect at least the three-dimensional morphological information of the coating area of ​​the electrode sheet, and the control unit 4 is used to send an alarm command to the alarm component 5 based on the three-dimensional morphological information of the coating area.

[0092] For example, the alarm component 5 and the control unit 4 can be connected by wire or wireless means.

[0093] Specifically, the control unit 4 determines the thickness of the coating area based on the three-dimensional topography information of the coating area. For example, if the thickness standard deviation σ > 5 μm, the control unit 4 will trigger an alarm and mark the corresponding roller 11, prompting the operator to maintain the roller 11 in order to improve the quality of the electrode sheet 200 produced in the future.

[0094] The alarm component 5 in this application embodiment can be a vibration alarm, that is, to alert the operator by emitting vibration.

[0095] This setup allows for monitoring of the coating thickness of the electrode 200. If the coating thickness does not meet the requirements, timely measures can be taken to improve the cold pressing quality of the electrode 200.

[0096] In some embodiments, the alarm component 5 includes a sound alarm and / or a light alarm.

[0097] Setting alarm component 5 as a sound alarm and / or a light alarm provides a more obvious warning effect.

[0098] Secondly, this application also provides an electrode production apparatus, including the aforementioned cold pressing device 100 and a coating device. The coating device is located upstream of the cold pressing device 100 and is used to coat an active material layer on a substrate to form a coating area of ​​the electrode.

[0099] For example, the electrode production equipment also includes a drying device located downstream of the coating device and upstream of the cold pressing device 100. The drying device is used to dry the substrate coated with the active material layer to form a dried electrode 200.

[0100] Thirdly, embodiments of this application also provide a battery production system, including the aforementioned cold pressing device or the aforementioned electrode production equipment.

[0101] For example, a battery production system includes a first assembly unit for loading electrode assemblies into a housing.

[0102] For example, the battery production system includes a second assembly unit for welding end caps to the housing.

[0103] For example, the battery production system includes a liquid injection device for injecting liquid into the housing through a liquid injection port on the end cap.

[0104] For example, the battery production system includes a winding device or a stacking device. The winding device is used to wind a positive electrode sheet, a negative electrode sheet, and a separator to form an electrode assembly, and the stacking device is used to stack a positive electrode sheet, a negative electrode sheet, and a separator to form an electrode assembly.

[0105] Please see Figures 1-3This application provides a cold pressing apparatus 100 for use in the cold pressing process of an electrode 200. The cold pressing apparatus 100 includes a cold pressing mechanism 1, a tension mechanism 2, a detection unit 3, and a control unit 4. The cold pressing mechanism 1 includes at least one pair of rollers 11 for cold pressing the electrode. The tension mechanism 2 includes at least one tension roller for applying tension to the electrode 200. A detection unit 3 is located downstream of at least one of the tension mechanism 2 and the cold pressing mechanism 1 for detecting the three-dimensional morphological information of the electrode. The control unit 4 is connected to the detection unit 3, and at least one of the cold pressing mechanism 1 and the tension mechanism 2 is connected to the control unit 4. The control unit 4 controls the pressure of the cold pressing mechanism 1 and / or the tension of the tension mechanism 2 based on the three-dimensional morphological information of the electrode. The cold pressing mechanism 1 includes a first driving member 12, to which at least one of two paired rollers 11 is connected. The first driving member 12 drives one roller 11 to move closer to or away from the other roller 11 to adjust the pressure of the roller 11 on the electrode 200. A control unit 4 is connected to the first driving member 12 and controls the first driving member 12 to adjust the pressure of the roller 11. The cold pressing mechanism 1 also includes a pressure sensor 13, which is disposed on the roller 11 and connected to the control unit 4. The pressure sensor 13 monitors the pressure of the roller 11 on the electrode 200 and provides feedback to the control unit 4. The tension mechanism 2 includes a first tension roller 21 and a second tension roller 22, with the second tension roller 22 located downstream of the first tension roller 21. The cold pressing mechanism 1 is located between the first tension roller 21 and the second tension roller 22, and a detection unit 3 is located downstream of the second tension roller 22. The detection unit 3 includes a 3D profiler.

[0106] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended 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 they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A cold-pressing device for use in a cold-pressing process of a pole piece, characterized by, The cold pressing device includes: A cold pressing mechanism includes at least a pair of rollers for cold pressing the electrode sheet; A tension mechanism includes at least one tension roller for applying tension to the electrode sheet; The detection unit is provided downstream of at least one of the tension mechanism and the cold pressing mechanism, and is used to detect the three-dimensional morphology information of the electrode sheet; A control unit is connected to the detection unit, and at least one of the cold pressing mechanism and the tension mechanism is connected to the control unit. The control unit is used to control the tension of the tension mechanism and / or the pressure of the cold pressing mechanism based on the three-dimensional morphology information of the electrode.

2. The cold pressing device according to claim 1, characterized in that, The cold pressing mechanism includes a first driving member, at least one of the two paired rollers is connected to the first driving member, and the first driving member is used to drive one of the rollers to move closer to or away from the other roller to adjust the pressure of the roller on the electrode sheet; The control unit is connected to the first drive component and is used to control the first drive component to adjust the pressure of the roll.

3. The cold pressing device according to claim 2, characterized in that, The cold pressing mechanism also includes a pressure sensor, which is disposed on the roller and connected to the control unit. The pressure sensor is used to monitor the pressure of the roller on the electrode and to provide feedback to the control unit.

4. The cold press apparatus of claim 1, wherein, The detection unit is located downstream of the cold pressing mechanism and the tensioning mechanism.

5. The cold press apparatus of claim 4, wherein, The cold pressing device includes multiple cold pressing units. Each cold pressing unit includes the detection unit and a cold pressing mechanism and a tensioning mechanism located upstream of the detection unit. The multiple cold pressing units are arranged sequentially along the direction of the electrode sheet.

6. A cold pressing device according to claim 4 or 5, characterized in that The tension mechanism includes a first tension roller and a second tension roller, the second tension roller being located downstream of the first tension roller, the cold pressing mechanism being located between the first tension roller and the second tension roller, and the detection unit being located downstream of the second tension roller.

7. The cold press apparatus of claim 1, wherein, The detection unit includes a 3D profilometer.

8. The cold press of claim 1, wherein, The cold pressing device includes an alarm component, which is connected to the control unit. The detection unit is used to detect at least the three-dimensional morphological information of the coating area of ​​the electrode, and the control unit is used to send an alarm command to the alarm component based on the three-dimensional morphological information of the coating area.

9. The cold press apparatus of claim 8, wherein, The alarm components include audible alarms and / or light alarms.

10. An electrode tab production apparatus characterized by comprising: include: The cold pressing apparatus as described in any one of claims 1-9; as well as A coating apparatus, located upstream of the cold pressing apparatus, is used to coat an active material layer onto a substrate to form a coating area of ​​the electrode sheet.

11. A battery production system characterized by comprising: Includes the cold pressing apparatus as described in any one of claims 1-9 or the electrode production equipment as described in claim 10.

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