Battery electrode sheet processing device, processing control method and thickness pre-rebound processing method

Abstract

Disclosed in the present application are a battery electrode sheet processing device, a processing control method, and a thickness pre-rebound processing method. The battery electrode sheet processing device comprises a roll-pressing mechanism, a heating mechanism, a first thickness measurement mechanism and a first temperature measurement mechanism. The roll-pressing mechanism is configured to roll-press a battery electrode sheet. The heating mechanism comprises an oven and a heating element, the oven having an accommodating cavity, and the heating element being arranged in the accommodating cavity and configured to heat the roll-pressed battery electrode sheet. The first thickness measurement mechanism is arranged downstream of the heating element and is configured to measure a first thickness of the battery electrode sheet. The first temperature measurement mechanism is arranged downstream of the heating element and is configured to measure a first temperature of the battery electrode sheet.

Description

Battery electrode processing device, processing control method and thickness pre-rebound processing method

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202510319184.6, filed on March 18, 2025, entitled “Battery Electrode Processing Apparatus, Processing Control Method and Thickness Pre-Rebound Processing Method”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of batteries, and in particular to a battery electrode processing apparatus, a battery electrode processing control method, and a battery electrode thickness pre-rebound processing method. Background Technology

[0004] Batteries 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.

[0005] During battery production, the battery electrodes need to be rolled to increase their compaction density. However, after rolling, uneven stress distribution may form inside the electrodes, which can lead to electrode breakage during battery use, affecting the battery's cycle performance and reliability. Summary of the Invention

[0006] This application provides a battery electrode processing apparatus, a battery electrode processing control method, and a battery electrode thickness pre-rebound processing method, which can release battery electrode stress through heating and improve the thickness uniformity of battery electrodes.

[0007] In a first aspect, this application provides a battery electrode processing apparatus, comprising a rolling mechanism, a heating mechanism, a first thickness measuring mechanism, and a first temperature measuring mechanism. The rolling mechanism is used to roll battery electrodes. The heating mechanism includes an oven and a heating element; the oven has a receiving cavity, and the heating element is disposed within the receiving cavity and used to heat the rolled battery electrodes. The first thickness measuring mechanism is disposed downstream of the heating element and is used to measure a first thickness of the battery electrodes. The first temperature measuring mechanism is disposed downstream of the heating element and is used to measure a first temperature of the battery electrodes.

[0008] The rolling mechanism can roll the battery electrode sheets to increase their compaction density. The heating element heats the rolled battery electrode sheets, causing their thickness to rebound, releasing some of the accumulated stress and reducing the risk of breakage in subsequent electrode fabrication. By incorporating a first thickness measuring mechanism and a first temperature measuring mechanism, the battery electrode processing device can promptly acquire the first thickness and first temperature of the heated battery electrode sheets. Based on these measurements, it can control the heating power of the heating element, thereby controlling the rebound thickness of the battery electrode sheets, reducing thickness variations, and improving thickness uniformity.

[0009] In some embodiments, the heating element includes at least one of an infrared heating element, an electromagnetic heating element, and a hot air heating element. Optionally, the infrared heating element includes an infrared lamp.

[0010] In some embodiments, the heating mechanism includes multiple heating elements. By providing multiple heating elements, the heated area of ​​the battery electrode can be increased, the uniformity of heating of the battery electrode can be improved, and the thickness consistency of the battery electrode can be enhanced.

[0011] In some embodiments, multiple heating elements are respectively disposed on both sides of the battery electrode. The embodiments of this application can improve heating efficiency and also enhance the uniformity of heating on both sides of the battery electrode.

[0012] In some embodiments, the heating mechanism includes a support frame disposed within the oven, and the heating element is disposed on the support frame. The support frame can support the heating element, improving its stability. By providing a support frame, the position of the heating element can be made more flexible, which is beneficial for improving the uniformity of heating.

[0013] In some embodiments, the heating mechanism includes a guide connected to the oven, and a bracket movably disposed on the guide. The bracket is configured to move the heating element closer to or further away from the battery electrode. By moving the bracket, the distance between the heating element and the battery electrode can be changed, thereby changing the heating power. When the specifications (e.g., thickness) of the battery electrode change, the bracket can be moved to adapt the distance between the heating element and the battery electrode to the specifications of the battery electrode.

[0014] In some embodiments, there are multiple supports, and each support is equipped with at least one heating element. By setting multiple supports, more heating elements can be arranged, thereby improving the uniformity of heating.

[0015] In some embodiments, the heating mechanism further includes a baffle disposed on the support, along the carrying direction of the battery electrode, with at least one side of the heating element having a baffle. The baffle can block the heat generated by the heating element, slowing down the diffusion of heat to the surrounding environment, so that the heat is concentrated on the battery electrode, thereby improving thermal efficiency.

[0016] In some embodiments, the heating mechanism includes multiple drive rollers disposed in the receiving cavity, which guide the battery electrode sheet's movement. A heating element is disposed between at least two adjacent drive rollers along the electrode sheet's movement direction. By using multiple drive rollers, the length of the battery electrode sheet's movement within the receiving cavity can be increased, extending the heating time. The drive rollers not only transport the battery electrode sheet but also maintain its tension, improving the smoothness of the electrode sheet's movement; the placement of a heating element between adjacent drive rollers reduces the distance fluctuation between the heating element and the battery electrode sheet, improving heating uniformity.

[0017] In some embodiments, the plurality of drive rollers includes a plurality of first drive rollers and a plurality of second drive rollers, wherein the plurality of first drive rollers are arranged horizontally, and the plurality of second drive rollers are arranged horizontally, and in the vertical direction, the second drive rollers are higher than the first drive rollers. By setting the first drive rollers and second drive rollers at different heights, the length of the battery electrode sheet traveling within the receiving cavity can be increased, thereby extending the heating time.

[0018] In some embodiments, the first drive roller and the second drive roller are arranged alternately along the belt travel direction of the battery electrode. In other embodiments, a plurality of first drive rollers are located upstream or downstream of a plurality of second drive rollers along the belt travel direction of the battery electrode.

[0019] In some embodiments, the first drive roller and the second drive roller do not overlap in the vertical direction. When the battery electrode travels between the first drive roller and the second drive roller, the battery electrode may have a certain slope.

[0020] In some embodiments, the heating mechanism further includes a bearing, which is disposed outside and connected to the oven, and a drive roller is connected to the bearing. Distributing the bearing outside the oven reduces its temperature, slows down its aging, lowers the risk of it seizing, and improves the reliability of the device.

[0021] In some embodiments, the battery electrode processing apparatus includes an adjustment component connected to at least one heating element. The adjustment component is configured to adjust the power setting of the heating element based on a first thickness and a first temperature. By combining the first thickness and the first temperature, the adjustment component adjusts the power setting of the heating element in real time, controlling the heat release from the heating element, thereby causing the battery electrode to rebound to a target thickness upon heating, reducing the thickness difference of the battery electrode. This embodiment of the application achieves temperature control by adjusting the power setting of the heating element, which is beneficial for improving the thickness uniformity of the battery electrode.

[0022] In some embodiments, multiple heating elements and multiple adjusting components are provided, with each adjusting component connected to at least one heating element. Each adjusting component can independently control its corresponding heating element. By providing multiple adjusting components, the power settings of the multiple heating elements can be controlled more flexibly, improving heating uniformity.

[0023] In some embodiments, each regulating component is connected to at least two heating elements, and the heating elements connected to one regulating component form a heating group. Multiple heating groups are arranged sequentially along the carrying direction of the battery electrode. The embodiments of this application can, to a certain extent, balance the number of regulating components with the flexibility of power control.

[0024] In some embodiments, the regulating component includes a power modulator configured to adjust the power opening of the heating element by changing the electrical power output. Power modulators offer advantages such as precise control, fast response, and high reliability; using a power modulator to adjust the power opening of the heating element can improve the accuracy and timeliness of the regulation.

[0025] In some embodiments, the adjusting component is disposed outside the oven. Embodiments of this application can reduce the impact of high temperatures on the adjusting component, extend its service life, and improve its accuracy.

[0026] In some embodiments, the battery electrode processing apparatus includes a controller configured to control an adjustment component based on a first thickness and a first temperature to adjust the power opening of a heating element. The controller can process thickness and temperature information and send signals to the adjustment component in real time to adjust the power opening of the heating element, thereby improving system control accuracy, reducing thickness variations in the battery electrodes, and enhancing the thickness uniformity of the battery electrodes.

[0027] In some embodiments, the controller includes a first PID controller configured to determine a first power adjustment amount for the power opening based on a target temperature of the battery electrode and a first temperature. The first PID controller adjusts the power opening of the heating element based on temperature feedback, which can improve system response speed, enhance control accuracy, reduce thickness differences in the battery electrodes, and improve the thickness uniformity of the battery electrodes.

[0028] In some embodiments, the controller includes a second PID controller configured to determine a second power adjustment amount for the power opening based on the first thickness and the target thickness of the battery electrode. The second PID controller adjusts the power opening of the heating element based on thickness information feedback, which can improve system response speed, enhance control accuracy, reduce thickness differences in the battery electrode, and improve the thickness consistency of the battery electrode.

[0029] In some embodiments, the controller includes a third PID controller configured to adjust the target temperature based on the first thickness and the target thickness of the battery electrode.

[0030] The first PID controller can adjust the power output based on temperature, while the second and third PID controllers adjust the target temperature and directly adjust the power output based on thickness. This embodiment of the application, through coordinated control of multiple control loops, helps improve the system's response speed, enhances its anti-interference capability, and improves its control accuracy.

[0031] In some embodiments, the battery electrode processing apparatus includes a speed measuring mechanism disposed upstream of the heating mechanism and used to detect the conveyor speed of the battery electrode. An adjusting component is also configured to adjust the power setting of the heating element according to the conveyor speed. During the processing of the battery electrode, the conveyor speed may vary. The adjusting component can compensate for the change in power setting of the heating element in real time under variable speed conditions, reducing the impact of speed changes on the thickness rebound of the battery electrode, improving the thickness consistency of the battery electrode, and reducing scrap.

[0032] In some embodiments, the rolling mechanism includes two opposing pressure rollers for rolling the battery electrodes. A speed measuring mechanism obtains the conveyor speed by detecting the rotational speed of one pressure roller. The speed measuring mechanism can calculate the conveyor speed of the battery electrodes based on the rotational speed and radius of the pressure roller, achieving high detection accuracy.

[0033] In some embodiments, the battery electrode processing apparatus further includes a second temperature measuring mechanism disposed within the receiving cavity and used to detect a second temperature within the receiving cavity. An adjusting component is also configured to adjust the power setting of the heating element according to the second temperature. The adjusting component can compensate for changes in the power setting of the heating element based on variations in the second temperature, thereby reducing the impact of internal temperature changes within the receiving cavity on the thickness rebound of the battery electrode, improving the thickness consistency of the battery electrode, and reducing scrap.

[0034] In some embodiments, the heating mechanism includes a plurality of second temperature measuring mechanisms arranged vertically. By providing multiple second temperature measuring mechanisms, more temperature information can be collected, thereby improving control accuracy.

[0035] In some embodiments, the first temperature measuring mechanism is disposed within the receiving cavity. The battery electrode processing apparatus further includes a protective sleeve, a first cooling mechanism, and a first conduit. The protective sleeve is disposed outside the first temperature measuring mechanism, the first cooling mechanism is disposed outside the oven and is used to provide a cooling medium, and the first conduit connects the protective sleeve and the first cooling mechanism. The cooling medium can flow through the protective sleeve to cool the first temperature measuring mechanism, reduce its temperature, decrease the risk of sensor damage or failure, and improve temperature measurement accuracy.

[0036] In some embodiments, the oven has a first opening and a second opening, the first opening communicating with the top of the receiving cavity and the second opening communicating with the bottom of the receiving cavity. The battery electrode processing apparatus further includes a second conduit located outside the oven and communicating with the first opening and the second opening.

[0037] The high-temperature gas at the top of the oven can flow into the bottom of the containment cavity through a second pipe. This second pipe allows the high-temperature gas to circulate, thereby reducing the temperature difference between the bottom and top of the containment cavity, providing temperature uniformity within the cavity, and reducing the impact of temperature differences within the cavity on the thickness rebound of the battery electrode sheets.

[0038] In some embodiments, the battery electrode processing apparatus further includes a second cooling mechanism connected to the oven and used to cool the heating element. After the battery electrode processing is completed, the second cooling mechanism can cool the heating element, slowing down its aging.

[0039] In some embodiments, the first thickness measuring mechanism is disposed outside the oven. The embodiments of this application can reduce the impact of high temperatures on the first thickness measuring mechanism, improve its measurement accuracy, and extend its service life.

[0040] In some embodiments, the battery electrode processing apparatus further includes a second thickness measuring mechanism disposed between the rolling mechanism and the heating mechanism, and used to measure the thickness of the battery electrode. By comparing the thickness measured by the first thickness measuring mechanism and the thickness measured by the second thickness measuring mechanism, the thickness rebound of the battery electrode after heating can be obtained.

[0041] In some embodiments, the battery electrode processing apparatus further includes an unwinding mechanism, a slitting mechanism, and a plurality of winding mechanisms. The unwinding mechanism is located upstream of the rolling mechanism and is used to unwind the battery electrode. The slitting mechanism is located downstream of the first thickness measuring mechanism and the first temperature measuring mechanism and is used to slit the battery electrode into a plurality of electrode sheets. The plurality of winding mechanisms are located downstream of the slitting mechanism and are used to wind up the plurality of electrode sheets.

[0042] Secondly, embodiments of this application provide a battery electrode processing control method, which includes:

[0043] Roll-formed battery electrodes;

[0044] Set the initial heating power setting and heat the rolled battery electrodes;

[0045] Obtain the first temperature and first thickness of the heated battery electrode;

[0046] The power adjustment amount is determined based on the first thickness and the first temperature;

[0047] Based on the initial heating power setting and power adjustment amount, adjust the actual output heating power setting.

[0048] Rolling the battery electrodes increases their compaction density. Heating the electrodes causes their thickness to rebound, releasing some of the accumulated stress and reducing the risk of breakage in subsequent electrode fabrication. Based on the initial thickness and temperature, the actual heating power can be adjusted in real time to control the rebound thickness of the electrodes, reducing thickness variations and improving thickness uniformity.

[0049] In some embodiments, the step of determining the power adjustment amount based on the first thickness and the first temperature includes: determining the first power adjustment amount based on the target temperature of the battery electrode and the first temperature. Embodiments of this application can generate the first power adjustment amount based on readily available temperature information, thereby improving system response speed, enhancing control accuracy, reducing thickness differences in the battery electrode, and improving the thickness consistency of the battery electrode.

[0050] In some embodiments, the step of determining the power adjustment amount based on the first thickness and the first temperature further includes:

[0051] The second power adjustment amount is determined based on the first thickness and the target thickness;

[0052] Adjust the target temperature based on the initial thickness and the target thickness.

[0053] In this embodiment, the target temperature can be adjusted based on the first thickness and the target thickness, and a second power adjustment amount can also be obtained. This embodiment, through coordinated control of multiple control loops, helps improve the system's response speed, enhances its anti-interference capability, and improves its control accuracy.

[0054] In some embodiments, the battery electrode processing control method further includes:

[0055] Obtain the conveyor speed of the battery electrode and determine the first power compensation amount based on the conveyor speed;

[0056] The second temperature inside the cavity of the oven is obtained, and the second power compensation amount is determined based on the second temperature, wherein the heating element for heating the battery electrode is disposed in the cavity;

[0057] The steps for adjusting the actual output heating power based on the initial heating power setting and the power adjustment amount include: adjusting the actual output heating power setting based on the initial heating power setting, the power adjustment amount, the first power compensation amount, and the second power compensation amount.

[0058] Reduce the impact of speed changes and secondary temperature changes on the rebound of battery electrode thickness, reduce the risk of battery electrode thickness exceeding the specification range, improve the thickness consistency of battery electrodes, and reduce scrap.

[0059] In some embodiments, the battery electrode processing control method further includes:

[0060] The initial ambient temperature inside the cavity of the oven is obtained, wherein the heating element for heating the battery electrode is disposed in the cavity;

[0061] Compare the initial ambient temperature with the preheating temperature;

[0062] When the initial ambient temperature is greater than or equal to the preheating temperature, the battery electrodes are rolled and heated.

[0063] Before starting the battery electrode processing, the inside of the oven can be preheated to improve heating efficiency and reduce the length of the battery electrode that will be scrapped.

[0064] Thirdly, embodiments of this application provide a method for pre-rebound processing of battery electrode thickness, comprising:

[0065] The coated battery electrode sheet is rolled to achieve the first target thickness.

[0066] The battery electrode with a first target thickness is heated so that the thickness of the battery electrode rebounds to a second target thickness; wherein the second target thickness is greater than or equal to the first target thickness.

[0067] By rolling the battery electrode sheet to a first target thickness, the compaction density of the battery electrode sheet can be increased. Heating the battery electrode sheet can cause its thickness to rebound to a second target thickness, releasing some of the stress accumulated inside the battery electrode sheet and reducing the risk of breakage in the subsequently manufactured electrode sheet.

[0068] In some embodiments, during the rolling process of the coated battery electrode sheet, the temperature of the battery electrode sheet is 18°C-30°C; during the heating process of the battery electrode sheet having a first target thickness, the temperature of the heated battery electrode sheet is 80°C-250°C. The temperature of the battery electrode sheet increases significantly from the rolling stage to the heating stage; as the temperature increases, the thickness of the battery electrode sheet rebounds.

[0069] In some embodiments, the ratio of the second target thickness to the first target thickness is 1.02-1.1.

[0070] In this embodiment, the ratio of the second target thickness to the first target thickness is set to be greater than or equal to 1.02, which can release some of the stress accumulated inside the battery electrode and reduce the risk of subsequent electrode breakage. In another embodiment, the ratio of the second target thickness to the first target thickness is set to be less than or equal to 1.1, which can reduce the impact of thickness rebound on the compaction density of the battery electrode.

[0071] In some embodiments, the step of rolling the coated battery electrode sheet includes:

[0072] Unwind the coated battery electrode sheets;

[0073] The battery electrode is rolled at least once along the belt travel direction.

[0074] In some embodiments, the step of heating a battery electrode having a first target thickness so that the thickness of the battery electrode rebounds to a second target thickness includes:

[0075] Set the initial heating power level and heat the battery electrode with the first target thickness;

[0076] Obtain the thickness and initial temperature of the heated battery electrode.

[0077] The power regulation amount is determined based on the thickness of the battery electrode and the initial temperature.

[0078] Based on the initial heating power setting and power adjustment, the actual output heating power setting is adjusted so that the thickness of the battery electrode sheet rebounds to the second target thickness.

[0079] Based on the thickness of the battery electrode and the initial temperature, the actual heating power can be adjusted in real time to control the rebound thickness of the battery electrode, reduce the thickness difference of the battery electrode, and improve the thickness consistency of the battery electrode.

[0080] In some embodiments, the step of determining the power regulation amount based on the thickness of the battery electrode and a first temperature includes:

[0081] The first power regulation amount is determined based on the target temperature and the first temperature of the battery electrode.

[0082] The second power regulation amount is determined based on the thickness of the battery electrode and the second target thickness.

[0083] Adjust the target temperature based on the thickness of the battery electrode and the second target thickness.

[0084] By obtaining the initial temperature and the thickness of the battery electrode, coordinated control of multiple control loops can be achieved, which helps to improve the system's response speed, enhance the system's anti-interference capability, and improve the system's control accuracy.

[0085] In some embodiments, the battery electrode thickness pre-rebound processing method further includes: acquiring the conveyor speed of the battery electrode and determining a first power compensation amount based on the conveyor speed; acquiring a second temperature inside the receiving cavity of the oven and determining a second power compensation amount based on the second temperature, wherein a heating element for heating the battery electrode is disposed in the receiving cavity. The step of adjusting the actual output heating power based on the initial heating power opening and the power adjustment amount to make the thickness of the battery electrode rebound to a second target thickness includes: adjusting the actual output heating power opening based on the initial heating power opening, the power adjustment amount, the first power compensation amount, and the second power compensation amount to make the thickness of the battery electrode rebound to a second target thickness.

[0086] The embodiments of this application can adjust the actual heating power opening in real time according to the conveying speed of the battery electrode and the second temperature in the cavity, thereby reducing the impact of speed changes and temperature changes in the cavity on the thickness rebound of the battery electrode, improving the thickness consistency of the battery electrode, and reducing scrap.

[0087] In some embodiments, the battery electrode includes multiple active material coating areas along its width direction. The battery electrode thickness pre-rebound processing method further includes: along the belt direction of the battery electrode, the battery electrode with its thickness rebounded to a second target thickness is cut according to a preset width of the active material coating area of ​​the battery cell to form multiple electrodes for manufacturing battery cells. Attached Figure Description

[0088] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0089] Figure 1 is a schematic diagram of a battery electrode processing apparatus provided in some embodiments of this application;

[0090] Figure 2 is a schematic diagram of the battery electrode.

[0091] Figure 3 is a cross-sectional view along the AA direction shown in Figure 2;

[0092] Figure 4 is a partial structural schematic diagram of a battery electrode processing device provided in some other embodiments of this application;

[0093] Figure 5 is a partial structural schematic diagram of a battery electrode processing device provided in some other embodiments of this application;

[0094] Figure 6 is an enlarged view of Figure 5 at the circular frame;

[0095] Figure 7 is an enlarged view of the area in the box in Figure 4;

[0096] Figure 8 is a partial structural schematic diagram of a battery electrode processing apparatus provided in some embodiments of this application;

[0097] Figure 9 is a schematic diagram of multiple drive rollers of a battery electrode processing apparatus provided in some embodiments of this application;

[0098] Figure 10 is a schematic diagram of multiple drive rollers of a battery electrode processing apparatus provided in some embodiments of this application;

[0099] Figure 11 is a schematic diagram of multiple drive rollers of a battery electrode processing apparatus provided in some embodiments of this application;

[0100] Figure 12 is a schematic diagram of multiple drive rollers of a battery electrode processing apparatus provided in some embodiments of this application;

[0101] Figure 13 is a schematic diagram of a battery electrode processing control method provided in some embodiments of this application;

[0102] Figure 14 is a logic control flowchart of a battery electrode processing control method provided in some embodiments of this application;

[0103] Figure 15 is a PID control system diagram of a battery electrode processing control method provided in some embodiments of this application;

[0104] Figure 16 is a schematic diagram of the first closed-loop circuit of the battery electrode processing control method provided in some embodiments of this application;

[0105] Figure 17 is a schematic diagram of a battery electrode thickness pre-rebound processing method provided in some embodiments of this application.

[0106] The reference numerals in the attached drawings are explained as follows: 1. Battery electrode processing device; 2. Battery electrode; 2a. Current collector; 2b. Active material layer; 2c. Active material coating area; 2d. Blank area; 3. Electrode; 10. Roller pressing mechanism; 101. Press roller; 11. Heating mechanism; 111. Oven; 1111. Receiving cavity; 1112. First opening; 1113. Second opening; 112. Heating element; 112a. Heating group; 113. Support; 114. Guide element; 115. Baffle; 12. First thickness measuring mechanism; 13. First temperature measuring mechanism; 14. Adjustment component; 15. Electrical box; 16. Controller; 161. First PID controller; 162. Second PID controller; 163. Third PID controller; 17. Speed ​​measuring mechanism; 18. Second temperature measuring mechanism; 19. Protective sleeve; 20. First cooling mechanism; 21. First pipeline; 22. Second thickness measuring mechanism; 23. Unwinding mechanism; 24. Slitting mechanism; 25. Rewinding mechanism; 26. Second cooling mechanism; 27. Drive roller; 27a. First drive roller; 27b. Second drive roller; 27c. Third drive roller; 28. Second pipeline; 29. ​​Circulating fan; 30. Bearing; C1. First closed-loop circuit; C2. Second closed-loop circuit; W. Width direction; X. Horizontal direction; Z. Vertical direction. Detailed Implementation

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] A battery cell typically includes an electrode assembly and a housing for containing the electrode assembly. The electrode assembly typically includes a positive electrode, a negative electrode, and a separator that separates the positive and negative electrodes. A battery cell can be a rechargeable battery, meaning it can be reused after being discharged by recharging to reactivate the active materials. For example, a battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, or a sodium-lithium-ion battery cell.

[0114] The electrode forming process is a key step in the manufacturing of battery cells. In some examples, a slurry containing active materials is first coated onto the surface of a current collector (such as copper or aluminum foil), and then the solvent in the slurry is removed by heating to prepare the battery electrode. After the slurry is heated and dried, an active material film layer is formed.

[0115] The electrode forming process also includes a rolling process. For example, battery electrodes can be rolled to increase the compaction density of the active material film. The rolling process helps to improve the energy density of a single battery cell.

[0116] After the rolling process, the materials inside the battery electrode attempt to return to their original state, generating a rebound force. After the battery electrode undergoes other processes to become the electrode for the battery cell, this rebound force creates an uneven stress distribution within the electrode. When the internal stress exceeds the material's strength limit, microcracks first appear at weak points. When these cracks propagate to a certain extent, the electrode's mechanical strength cannot withstand the internal stress, leading to breakage. Electrode breakage results in poor contact between the active material and the electrolyte, reducing the battery cell's capacity and charge / discharge performance. Simultaneously, the increased resistance at the break point affects electron and ion transport, further reducing the battery cell's cycle performance. A broken electrode may also puncture the separator, causing an internal short circuit and leading to risks such as battery overheating and fire.

[0117] After rolling the battery electrodes, heating them can cause the electrode thickness to rebound, releasing some of the stress accumulated during the rolling process and reducing the risk of breakage due to stress concentration during use. However, heating the battery electrodes with constant power or temperature may result in poor thickness uniformity after heating due to thickness fluctuations after rolling, changes in electrode specifications, or other reasons.

[0118] In view of this, the present application provides a technical solution that improves the thickness uniformity of the heated battery electrode by measuring the thickness and temperature of the battery electrode after heating and adjusting the heating power accordingly.

[0119] The battery electrode processing apparatus, battery electrode processing control method, and battery electrode thickness pre-rebound processing method described in the embodiments of this application are applicable to the manufacturing of positive electrode sheets and negative electrode sheets.

[0120] Figure 1 is a schematic diagram of a battery electrode processing apparatus provided in some embodiments of this application; Figure 2 is a schematic diagram of a battery electrode; Figure 3 is a cross-sectional view of Figure 2 along the AA direction; Figure 4 is a partial structural schematic diagram of a battery electrode processing apparatus provided in other embodiments of this application; Figure 5 is a partial structural schematic diagram of a battery electrode processing apparatus provided in other embodiments of this application; Figure 6 is an enlarged schematic diagram of Figure 5 at the circular frame; Figure 7 is an enlarged schematic diagram of Figure 4 at the square frame.

[0121] Referring to Figures 1 to 7, this application provides a battery electrode processing apparatus 1, which includes a rolling mechanism 10, a heating mechanism 11, a first thickness measuring mechanism 12, and a first temperature measuring mechanism 13. The rolling mechanism 10 is used to roll battery electrodes 2. The heating mechanism 11 includes an oven 111 and a heating element 112. The oven 111 has a receiving cavity 1111 inside, and the heating element 112 is disposed within the receiving cavity 1111 and used to heat the rolled battery electrodes 2. The first thickness measuring mechanism 12 is disposed downstream of the heating element 112 and is used to measure the first thickness of the battery electrodes 2. The first temperature measuring mechanism 13 is disposed downstream of the heating element 112 and is used to measure the first temperature of the battery electrodes 2.

[0122] The battery electrode 2 may include a current collector 2a and an active material layer 2b disposed on the surface of the current collector 2a. The portion of the current collector 2a covered by the active material layer 2b and the portion of the current collector 2a covered by the active material layer 2b form the active material coating area 2c of the battery electrode 2, and the portion of the current collector 2a not covered by the active material layer 2b forms the blank area 2d of the battery electrode 2.

[0123] As an example, the current collector 2a may be a metal foil, and the active material layer 2b may include an active material.

[0124] Battery electrode 2 can be used to manufacture the positive or negative electrode of a battery cell. For example, for a battery electrode used to manufacture a positive electrode, the current collector can be aluminum foil, and the active material can include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. For a battery electrode used to manufacture a negative electrode, the current collector can be copper foil, and the active material can include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc.

[0125] The active material coating area 2c can be one or more. As an example, along the width direction W of the battery electrode 2, the blank area 2d and the active material coating area 2c are arranged alternately.

[0126] There can be one or more rolling mechanisms 10. As an example, multiple rolling mechanisms 10 can be set up, and the multiple rolling mechanisms 10 are arranged sequentially along the belt-carrying direction of the battery electrode 2.

[0127] For example, the rolling mechanism 10 can roll the battery electrode 2 to thin the active material layer 2b and increase the compaction density of the active material layer 2b.

[0128] Along the belt direction of the battery electrode 2, the oven 111 can be located downstream of the rolling mechanism 10; that is, the battery electrode 2 first passes through the rolling mechanism 10 and then passes through the oven 111.

[0129] The heating element 112 heats the battery electrode 2 by means including but not limited to hot air heating, infrared heating, electromagnetic heating or other methods.

[0130] The heating element 112 can directly contact the battery electrode 2 to heat the battery electrode 2; alternatively, a gap can be provided between the heating element 112 and the battery electrode 2.

[0131] There can be one or more heating elements 112.

[0132] The first thickness measuring mechanism 12 can be located inside or outside the oven 111. During the continuous conveying process of the battery electrode 2, the battery electrode 2 first passes through the heating element 112 and then through the first thickness measuring mechanism 12.

[0133] It should be noted that the thickness of the battery electrode 2 in the embodiments of this application refers to the thickness of the active material coating area 2c.

[0134] The first temperature measuring mechanism 13 can be located inside or outside the oven 111. During the continuous conveying process of the battery electrode 2, the battery electrode 2 first passes through the heating element 112 and then through the first temperature measuring mechanism 13. It should be noted that the first temperature measuring mechanism 13 measures the temperature of the active material coating area 2c.

[0135] The first temperature measuring mechanism 13 can be one or more.

[0136] Along the direction of the battery electrode 2, the first temperature measuring mechanism 13 can be located upstream of the first thickness measuring mechanism 12 or downstream of the first thickness measuring mechanism 12.

[0137] In this embodiment, the rolling mechanism 10 can roll the battery electrode 2 to increase its compaction density. The heating element 112 can heat the rolled battery electrode 2, causing its thickness to rebound, releasing some of the stress accumulated inside the battery electrode 2, and reducing the risk of subsequent electrode breakage. By setting the first thickness measuring mechanism 12 and the first temperature measuring mechanism 13, the battery electrode processing device 1 can promptly obtain the first thickness and first temperature of the heated battery electrode 2, and based on the first thickness and first temperature, control the heating power of the heating element 112 to control the rebound thickness of the battery electrode 2, reduce the thickness difference of the battery electrode 2, and improve the thickness consistency of the battery electrode 2.

[0138] In some embodiments, the oven 111 can provide a relatively enclosed receiving cavity 1111, and a high temperature can be maintained inside the oven 111 under the heating of the heating element 112. When the battery electrode 2 passes through the receiving cavity 1111, the high temperature environment inside the receiving cavity 1111 is conducive to the heating of the battery electrode 2.

[0139] In some embodiments, there are multiple rolling mechanisms 10. Multiple rolling mechanisms 10 can perform multi-stage rolling of the battery electrode 2, thereby increasing the compaction density of the battery electrode 2 and improving the thickness uniformity of the battery electrode 2 after rolling.

[0140] In some embodiments, the first thickness measuring mechanism 12 includes a thickness gauge. As an example, the thickness gauge may be a beta-ray thickness gauge, a laser thickness gauge, or an ultrasonic thickness gauge.

[0141] In some embodiments, the first thickness measuring mechanism 12 is disposed on the outside of the oven 111. This embodiment can reduce the impact of high temperatures on the first thickness measuring mechanism 12, improve the measurement accuracy of the first thickness measuring mechanism 12, and extend the service life of the first thickness measuring mechanism 12.

[0142] In some embodiments, the length of the battery electrode 2 located between the first thickness measuring mechanism 12 and the heating element 112 along the conveying direction of the battery electrode 2 is 3m-10m.

[0143] In some embodiments, the first temperature measuring mechanism 13 is disposed upstream of the first thickness measuring mechanism 12.

[0144] In some embodiments, the heating element 112 includes at least one of an infrared heating element, an electromagnetic heating element, and a hot air heating element.

[0145] Infrared heating elements can directly heat the surface of the battery electrode 2 using infrared radiation. Infrared heating has advantages such as fast heating speed and high energy utilization.

[0146] The electromagnetic heating element can generate a magnetic field. During the process of the battery electrode 2 running, the current collector 2a can cut the magnetic field lines and generate heat, thereby heating the active material layer 2b.

[0147] The hot air heating element can blow hot air evenly onto the surface of the battery electrode 2 to achieve heating. The hot air heating method provides uniform heating and is suitable for heating large-area battery electrode 2.

[0148] In some embodiments, the heating element 112 may include a heating roller through which the battery electrode 2 passes. Optionally, a high-temperature medium may flow through the heating roller to achieve heating.

[0149] In some embodiments, the infrared heating element includes an infrared lamp. Infrared lamps have advantages such as fast heating speed, good uniformity, high energy utilization, and non-contact heating, and are used to heat the electrode.

[0150] In addition, the power and heating time of the infrared lamp can be precisely controlled. Using infrared lamps to heat the battery electrode 2 can achieve precise temperature control and improve the thickness uniformity of the battery electrode 2 after heating.

[0151] In some embodiments, the size of the heating element 112 is larger than the size of the battery electrode 2 along the width direction W of the battery electrode 2.

[0152] In some embodiments, the heating mechanism 11 includes a plurality of heating elements 112.

[0153] The multiple heating elements 112 can be of the same type or different types. Optionally, the multiple heating elements 112 of the heating mechanism 11 are all infrared lamps.

[0154] The heating power of multiple heating elements 112 can be the same or different.

[0155] Multiple heating elements 112 can heat the battery electrode 2 from the same side or from both sides.

[0156] By setting multiple heating elements 112, the heating area of ​​the battery electrode 2 can be increased, the heating uniformity of the battery electrode 2 can be improved, and the thickness consistency of the battery electrode 2 can be improved.

[0157] In some embodiments, a plurality of heating elements 112 are respectively disposed on both sides of the battery electrode 2. This embodiment can improve heating efficiency and also enhance the uniformity of heating on both sides of the battery electrode 2.

[0158] For example, both sides of the battery electrode 2 are provided with active material layers 2b, a portion of the plurality of heating elements 112 heats the active material layer 2b on one side, and another portion of the plurality of heating elements 112 heats the active material layer 2b on the other side.

[0159] In some embodiments, a plurality of heating elements 112 are arranged in pairs.

[0160] Multiple pairs of heating elements 112 are arranged sequentially along the carrying direction of the battery electrode 2, and the battery electrode 2 passes through the space between each pair of heating elements 112.

[0161] Optionally, the arrangement direction of the pair of heating elements 112 may be parallel to the thickness direction of the portion of the battery electrode 2 located between the pair of heating elements 112.

[0162] In some embodiments, the number of pairs of heating elements 112 is 5-30. Optionally, the number of pairs of heating elements 112 is 5, 10, 15, 20, 25 or 30.

[0163] In some embodiments, the heating mechanism 11 includes a bracket 113 disposed inside the oven 111, and the heating element 112 disposed on the bracket 113.

[0164] There can be one or multiple brackets 113.

[0165] One heating element 112 can be installed on the bracket 113, or multiple heating elements 112 can be installed at the same time.

[0166] Inside the oven 111, the support 113 can be fixed or its position can be adjusted.

[0167] The bracket 113 can support the heating element 112, improving the stability of the heating element 112. By setting the bracket 113, the position of the heating element 112 can be more flexible, which is conducive to improving the uniformity of heating.

[0168] In some embodiments, the heating mechanism 11 includes a guide 114 connected to the oven 111, and a bracket 113 is movably disposed on the guide 114. The bracket 113 is configured to move the heating element 112 closer to or further away from the battery electrode 2.

[0169] By moving the support 113, the distance between the heating element 112 and the battery electrode 2 can be changed, thereby changing the heating power. When the specifications (e.g., thickness) of the battery electrode 2 change, the support 113 can be moved to adapt the distance between the heating element 112 and the battery electrode 2 to the specifications of the battery electrode 2.

[0170] In some embodiments, the support 113 can be moved manually or by other power sources. Optionally, the heating mechanism 11 includes a power unit connected to the support 113 and used to drive the support 113 to move along the guide 114. Exemplarily, the power unit includes a cylinder or a motor.

[0171] In some embodiments, the guide 114 may be fixed to the wall of the oven 111.

[0172] In some embodiments, there are multiple supports 113, and at least one heating element 112 is mounted on each support 113. By providing multiple supports 113, more heating elements 112 can be arranged, thereby improving the uniformity of heating.

[0173] For example, each bracket 113 can move independently, and the positions of the multiple heating elements 112 can be flexibly adjusted.

[0174] In some embodiments, multiple heating elements 112 are mounted on each bracket 113. Given a fixed number of heating elements 112, the embodiments of this application can reduce the number of brackets 113, simplifying the structure of the heating mechanism 11.

[0175] In some embodiments, multiple supports 113 are arranged in pairs. The multiple pairs of supports 113 are arranged along the belt-carrying direction of the battery electrode 2. A pair of heating elements 112 are respectively mounted on a pair of supports 113.

[0176] Optionally, multiple pairs of heating elements 112 are mounted on a pair of brackets 113.

[0177] In some embodiments, the heating mechanism 11 further includes a baffle 115 disposed on the bracket 113. The baffle 115 is disposed on at least one side of the heating element 112 along the carrying direction of the battery electrode 2.

[0178] During this explanation, the direction of the tape travel of the battery electrode 2 may vary at different locations. In this embodiment, the tape travel direction refers to the direction of the portion of the battery electrode 2 corresponding to the heating element 112.

[0179] The baffle 115 can block the heat generated by the heating element 112, slow down the diffusion of heat to the surrounding environment, so that the heat is concentrated on the battery electrode 2 and the thermal efficiency is improved.

[0180] In some embodiments, there are multiple heating elements 112, and each heating element 112 is provided with a baffle 115.

[0181] In some embodiments, baffles 115 are provided on both sides of the heating element 112 along the belt direction of the battery electrode 2.

[0182] In some embodiments, the heating element 112 includes an infrared lamp tube, and the surface of the baffle 115 facing the infrared lamp tube is a smooth surface. The smooth surface can reflect at least a portion of the infrared radiation to the battery electrode 2, thereby improving thermal efficiency.

[0183] In some embodiments, the baffle 115 is rotatably connected to the bracket 113, and the tilt angle of the baffle 115 relative to the battery electrode 2 is adjustable.

[0184] In some embodiments, the battery electrode processing apparatus 1 includes an adjustment member 14 connected to at least one heating element 112. The adjustment member 14 is configured to adjust the power setting of the heating element 112 based on a first thickness and a first temperature.

[0185] The adjustment component 14 can be one or more.

[0186] The adjustment component 14 can be connected to one heating element 112 or multiple heating elements 112.

[0187] For example, the power setting of the heating element 112 refers to the degree to which the power output of the heating element 112 is adjusted, usually expressed as a percentage. The power setting reflects the ratio of the current power of the heating element 112 to its maximum power; specifically, power setting = (current power / maximum power) × 100%. The higher the power setting, the more heat the heating element 112 releases, and the faster the battery electrode 2 heats up. Conversely, the lower the power setting, the less heat the heating element 112 releases, and the slower the battery electrode 2 heats up.

[0188] The adjusting component 14, in conjunction with the first thickness and the first temperature, adjusts the power setting of the heating element 112 in real time to control the heat release of the heating element 112, thereby causing the battery electrode 2 to rebound to the target thickness upon heating, reducing the thickness difference of the battery electrode 2. In this embodiment, temperature control is achieved by adjusting the power setting of the heating element 112 through the adjusting component 14, which is beneficial for improving the thickness uniformity of the battery electrode 2.

[0189] In some embodiments, the power opening range of the heating element 112 is 0-100%.

[0190] In some embodiments, multiple heating elements 112 are provided, and multiple adjusting components 14 are provided, with each adjusting component 14 connected to at least one heating element 112.

[0191] An adjustment component 14 may be connected to only one heating element 112, or it may be connected to multiple heating elements 112 simultaneously.

[0192] Each regulating component 14 can independently control its corresponding heating element 112. By setting multiple regulating components 14, the power opening of multiple heating elements 112 can be controlled more flexibly, improving heating uniformity.

[0193] In some embodiments, each adjusting component 14 is connected to at least two heating elements 112, and the heating elements 112 connected to one adjusting component 14 form a heating group 112a. Multiple heating groups 112a are arranged sequentially along the belt travel direction of the battery electrode 2.

[0194] The embodiments of this application can, to a certain extent, balance the number of regulating components 14 and the flexibility of power opening control.

[0195] In some embodiments, a heating group 112a includes at least two pairs of heating elements 112.

[0196] In some embodiments, the regulating component 14 includes a power modulator configured to regulate the power opening of the heating element 112 by changing the output power.

[0197] The power modulator can adjust the output power according to the input signal. The output power of the power modulator is positively correlated with the power opening degree of the heating element 112.

[0198] Power modulators have advantages such as precise control, fast response and high reliability. By using a power modulator to adjust the power opening of the heating element 112, the accuracy and timeliness of the adjustment can be improved.

[0199] In some embodiments, the adjusting component 14 is disposed outside the oven 111. This embodiment can reduce the impact of high temperatures on the adjusting component 14, extend its service life, and improve its accuracy.

[0200] In some embodiments, the adjustment component 14 is connected to the heating element 112 via a wire.

[0201] In some embodiments, the battery electrode processing device 1 includes an electrical box 15, and the adjusting component 14 may be disposed inside the electrical box 15.

[0202] In some embodiments, the battery electrode processing apparatus 1 includes a controller 16 configured to control the adjusting member 14 according to a first thickness and a first temperature to adjust the power opening of the heating element 112.

[0203] The controller 16 can process thickness and temperature information and send signals to the adjustment component 14 in real time to adjust the power opening of the heating element 112, thereby improving the system control accuracy, reducing the thickness difference of the battery electrode 2, and improving the thickness consistency of the battery electrode 2.

[0204] In some embodiments, the controller 16 includes a first PID controller 161, which is configured to determine a first power regulation amount of the power opening based on the target temperature of the battery electrode 2 and a first temperature.

[0205] The PID controller 16 is a proportional-integral-derivative controller.

[0206] The target temperature of the battery electrode 2 can be a fixed temperature or a temperature that changes in real time during the processing of the battery electrode 2.

[0207] The first PID controller 161 adjusts the power opening of the heating element 112 according to the temperature information feedback, which can improve the system response speed, improve the control accuracy, reduce the thickness difference of the battery electrode 2, and improve the thickness consistency of the battery electrode 2.

[0208] In some embodiments, the first PID controller 161 is an incremental PID controller.

[0209] In some embodiments, the controller 16 includes a second PID controller 162, which is configured to determine a second power regulation amount of the power opening based on the first thickness and the target thickness of the battery electrode 2.

[0210] The second PID controller 162 adjusts the power opening of the heating element 112 based on the thickness information feedback, which can improve the system response speed, improve control accuracy, reduce the thickness difference of the battery electrode 2, and improve the thickness consistency of the battery electrode 2.

[0211] In some embodiments, the second PID controller 162 is an incremental PID controller.

[0212] In some embodiments, the controller 16 includes a third PID controller 163, which is configured to adjust the target temperature based on the first thickness and the target thickness of the battery electrode 2.

[0213] The first PID controller 161 can adjust the power output based on temperature, while the second PID controller 162 and the third PID controller 163 can adjust the target temperature and directly adjust the power output based on thickness. This embodiment of the application, through the coordinated control of multiple control loops, helps to improve the system's response speed, enhance its anti-interference capability, and improve its control accuracy.

[0214] In some embodiments, the third PID controller 163 is an incremental PID controller.

[0215] In some embodiments, the battery electrode processing apparatus 1 includes a speed measuring mechanism 17, which is disposed upstream of the heating mechanism 11 and is used to detect the conveying speed of the battery electrode 2.

[0216] The speed measuring mechanism 17 can directly detect the belt speed of the battery electrode 2, or indirectly calculate the belt speed of the battery electrode 2 by detecting the speed of other structures.

[0217] In some embodiments, the adjusting member 14 is also configured to adjust the power opening of the heating element 112 according to the belt conveyor speed.

[0218] During the processing of battery electrode 2, the conveyor speed of battery electrode 2 may change. The adjustment component 14 can compensate the power opening of the heating element 112 in real time according to the speed change under variable speed conditions, reduce the impact of speed change on the thickness rebound of battery electrode 2, improve the thickness consistency of battery electrode 2, and reduce scrap.

[0219] In some embodiments, the controller 16 can process the belt speed information and send a signal to the adjustment component 14 in real time, thereby enabling the adjustment component 14 to adjust the power opening of the heating element 112.

[0220] In some embodiments, the speed measuring mechanism 17 may include at least one of a laser velocimeter, an encoder, and a photoelectric sensor.

[0221] In some embodiments, the rolling mechanism 10 includes two opposing pressure rollers 101 for rolling the battery electrode sheets 2. The speed measuring mechanism 17 obtains the belt speed by detecting the rotational speed of one of the pressure rollers 101.

[0222] The speed measuring mechanism 17 can calculate the conveying speed of the battery electrode 2 based on the rotational speed and radius of the pressure roller 101. The speed measuring mechanism 17 in this embodiment can detect in real time and has high accuracy.

[0223] In some embodiments, the battery electrode processing apparatus 1 further includes a second temperature measuring mechanism 18, which is disposed in the receiving cavity 1111 and is used to detect a second temperature in the receiving cavity 1111.

[0224] For example, the second temperature may be the ambient temperature inside the oven 111.

[0225] The second temperature measuring device 18 can be one or more.

[0226] In some embodiments, the regulating component 14 is further configured to adjust the power opening of the heating element 112 according to the second temperature.

[0227] During the processing of the battery electrode 2, in addition to being affected by the heating element 112, the battery electrode 2 is also affected by the internal temperature of the receiving cavity 1111. As the heating element 112 continues to heat, the internal temperature of the receiving cavity 1111 will also change.

[0228] The adjusting component 14 can compensate for the power opening of the heating element 112 according to the change of the second temperature, thereby reducing the impact of the change of the internal temperature of the receiving cavity 1111 on the thickness rebound of the battery electrode 2, improving the thickness consistency of the battery electrode 2, and reducing scrap.

[0229] In some embodiments, the controller 16 can send a signal to the regulating component 14 in real time according to the second temperature, thereby enabling the regulating component 14 to adjust the power opening of the heating element 112.

[0230] In some embodiments, the second temperature measuring mechanism 18 may include a thermocouple temperature sensor.

[0231] In some embodiments, a second temperature measuring mechanism 18 is provided in the middle of the oven 111.

[0232] In some embodiments, the heating mechanism 11 includes a plurality of second temperature measuring mechanisms 18 arranged along the vertical direction Z.

[0233] The temperature range inside the cavity 1111 is relatively large. For example, the temperature is higher in the area near the heating element 112 and lower in the area away from the heating element 112.

[0234] This application embodiment can collect more temperature information by setting multiple second temperature measuring mechanisms 18, thereby improving control accuracy.

[0235] For example, the controller 16 can calculate the second temperature according to a certain ratio based on the temperature collected by each second temperature measuring device 18 and the position of each second temperature measuring device 18.

[0236] In some embodiments, the first temperature measuring mechanism 13 is disposed in the receiving cavity 1111, which can reduce the influence of the ambient temperature outside the oven 111 on the battery electrode 2 and improve the detection accuracy.

[0237] In addition, by placing the first temperature measuring mechanism 13 in the receiving cavity 1111, the distance between the first temperature measuring mechanism 13 and the heating element 112 can be reduced.

[0238] In some embodiments, the first temperature measuring mechanism 13 may include an infrared temperature sensor. The infrared temperature sensor measures the temperature of the battery electrode 2 by detecting radiation. Using an infrared temperature sensor to measure the temperature can reduce the influence of the internal environment of the housing cavity 1111 on the measurement results and improve the temperature measurement accuracy.

[0239] In some embodiments, the battery electrode processing apparatus 1 further includes a protective sleeve 19, a first cooling mechanism 20, and a first pipeline 21. The protective sleeve 19 is disposed outside the first temperature measuring mechanism 13, the first cooling mechanism 20 is disposed outside the oven 111 and is used to provide a cooling medium, and the first pipeline 21 connects the protective sleeve 19 and the first cooling mechanism 20.

[0240] For example, the cooling medium can be a gas or a liquid.

[0241] The cooling medium can flow through the protective sleeve 19 to cool the first temperature measuring mechanism 13, reduce the temperature of the first temperature measuring mechanism 13, reduce the risk of sensor damage or failure of the first temperature measuring mechanism 13, and improve the temperature measurement accuracy.

[0242] In some embodiments, there may be multiple first temperature measuring mechanisms 13, and the multiple first temperature measuring mechanisms 13 are arranged along the width direction W of the battery electrode 2.

[0243] For example, the number of first temperature measuring units 13 is greater than or equal to the number of active material coating areas 2c.

[0244] Optionally, the number of first temperature measuring mechanisms 13 is the same as the number of active material coating areas 2c, and each first temperature measuring mechanism 13 is used to measure the temperature of the corresponding active material coating area 2c.

[0245] In some embodiments, there are four first temperature measuring mechanisms 13.

[0246] In some embodiments, the battery electrode processing apparatus 1 further includes a second thickness measuring mechanism 22, which is disposed between the rolling mechanism 10 and the heating mechanism 11 and is used to measure the thickness of the battery electrode 2.

[0247] By comparing the thickness measured by the first thickness measuring mechanism 12 and the thickness measured by the second thickness measuring mechanism 22, the thickness rebound of the battery electrode 2 after heating can be obtained.

[0248] In some embodiments, the adjusting component 14 can adjust the power opening of the heating element 112 based on the thickness measured by the first thickness measuring mechanism 12 and the thickness measured by the second thickness measuring mechanism 22.

[0249] In some embodiments, the controller 16 can control the distance between the two pressure rollers 101 based on the thickness measured by the first thickness measuring mechanism 12, so as to improve the thickness consistency of the battery electrode 2 after rolling.

[0250] In some embodiments, the battery electrode processing apparatus 1 further includes an unwinding mechanism 23, which is disposed upstream of the rolling mechanism 10 and is used to unwind the battery electrode 2.

[0251] For example, after the battery electrode 2 is made through processes such as coating and drying of active materials, the battery electrode 2 can be wound up and formed into a roll. When the battery electrode 2 needs to be processed, the roll can be placed in the unwinding mechanism 23; the unwinding mechanism 23 unwinds the battery electrode 2 so that the battery electrode 2 passes through the rolling mechanism 10 and the heating mechanism 11 in sequence.

[0252] Alternatively, in some other embodiments, after the drying process, the battery electrode 2 may not be wound up and may be directly pulled to the rolling mechanism 10 for rolling.

[0253] In some embodiments, the battery electrode processing apparatus 1 further includes a slitting mechanism 24, which is disposed downstream of the first thickness measuring mechanism 12 and the first temperature measuring mechanism 13, and is used to slit the battery electrode 2 into multiple electrode sheets.

[0254] The slitting mechanism 24 can slit the battery electrode 2 according to the size requirements of the active material coating area of ​​the battery cell, thereby preparing the electrode 3 that can be used to manufacture battery cells.

[0255] For example, the slitting mechanism 24 can slit each active material coating area 2c of the battery electrode 2 into two. For instance, if the number of active material coating areas 2c of the battery electrode 2 is m, the slitting mechanism 24 can slit the battery electrode into 2×m electrodes.

[0256] In some embodiments, the battery electrode processing apparatus 1 further includes a plurality of winding mechanisms 25, which are disposed downstream of the slitting mechanism 24 and are used to wind up a plurality of electrode sheets 3.

[0257] For example, multiple winding mechanisms 25 correspond one-to-one with multiple electrode sheets.

[0258] The winding mechanism 25 can wind the electrode sheets into electrode rolls, which can then be transported to other processes for further processing.

[0259] In some embodiments, the battery electrode processing apparatus 1 further includes a second cooling mechanism 26, which is connected to the oven 111 and used to cool the heating element 112.

[0260] After the battery electrode 2 is processed, the second cooling mechanism 26 can cool the heating element 112 to slow down the aging of the heating element 112.

[0261] In some embodiments, the second cooling mechanism 26 includes a cooling fan and a plurality of air pipes, each air pipe being connected to the heating element 112. The cooling fan delivers cold air to the heating element 112 through the air pipes to quickly cool the heating element 112.

[0262] In some embodiments, a plurality of air pipes are provided in a one-to-one correspondence with a plurality of heating elements 112.

[0263] In some embodiments, valves are provided on each air pipe.

[0264] In some embodiments, the heating mechanism 11 further includes an exhaust fan, which may be disposed in the oven 111 and used to exhaust gas inside the oven 111. Optionally, the exhaust fan is installed on the top of the oven 111.

[0265] Optionally, while the cooling fan is delivering cold air, the exhaust fan can be activated to expel heat from the top of the oven 111.

[0266] In some embodiments, the heating mechanism 11 includes a plurality of drive rollers 27 disposed in the receiving cavity 1111, the plurality of drive rollers 27 being used to guide the battery electrode 2 on its path. By providing a plurality of drive rollers 27, the length of the battery electrode 2 on its path within the receiving cavity 1111 can be increased, thereby extending the heating time.

[0267] In some embodiments, a heating element 112 is provided between at least two adjacent drive rollers 27 along the belt travel direction of the battery electrode 2.

[0268] The drive roller 27 can not only transport the battery electrode 2, but also maintain the tension of the battery electrode 2 and improve the stability of the battery electrode 2's conveying. The heating element 112 is set between adjacent drive rollers 27, which can reduce the distance fluctuation between the heating element 112 and the battery electrode 2 and improve the uniformity of heating.

[0269] In some embodiments, the plurality of drive rollers 27 include a plurality of first drive rollers 27a and a plurality of second drive rollers 27b, the plurality of first drive rollers 27a being arranged along the horizontal direction X, the plurality of second drive rollers 27b being arranged along the horizontal direction X, and in the vertical direction Z, the second drive rollers 27b being higher than the first drive rollers 27a.

[0270] The number of first drive rollers 27a and the number of second drive rollers 27b can be the same or different.

[0271] In the vertical direction Z, the first drive roller 27a and the second drive roller 27b may or may not overlap.

[0272] When the battery electrode 2 is being conveyed, the order in which the battery passes through the first drive roller 27a and the second drive roller 27b can be flexibly set according to requirements.

[0273] In this embodiment of the application, by setting a first transmission roller 27a and a second transmission roller 27b with different heights, the length of the battery electrode 2 traveling in the receiving cavity 1111 can be increased, thereby extending the heating time.

[0274] In some embodiments, the plurality of drive rollers 27 further include a plurality of third drive rollers 27c, and a plurality of second drive rollers 27b are arranged along the horizontal direction X, and in the vertical direction Z, the third drive rollers 27c are higher than the second drive rollers 27b.

[0275] In some embodiments, the plurality of drive rollers 27 include two first drive rollers 27a, two second drive rollers 27b, and two third drive rollers 27c. Along the belt-carrying direction of the battery electrode 2, one first drive roller 27a, one second drive roller 27b, one third drive roller 27c, another third drive roller 27c, another second drive roller 27b, and another first drive roller 27a are arranged sequentially.

[0276] Optionally, along the conveying direction of the battery electrode 2, a heating element 112 is provided between adjacent first transmission rollers 27a and second transmission rollers 27b, and a heating element 112 is provided between adjacent second transmission rollers 27b and third transmission rollers 27c.

[0277] Figure 8 is a partial structural schematic diagram of a battery electrode processing apparatus provided in some embodiments of this application.

[0278] Referring to FIG8, in some embodiments, the oven 111 has a first opening 1112 and a second opening 1113, the first opening 1112 communicating with the top of the receiving cavity 1111 and the second opening 1113 communicating with the bottom of the receiving cavity 1111. The battery electrode processing apparatus 1 further includes a second conduit 28, which is located outside the oven 111 and communicates with the first opening 1112 and the second opening 1113.

[0279] The high-temperature gas at the top of the oven 111 can flow into the bottom of the receiving cavity 1111 through the second pipe 28. The second pipe 28 allows the high-temperature gas to circulate, thereby reducing the temperature difference between the bottom and top of the receiving cavity 1111, providing temperature uniformity within the receiving cavity 1111, and reducing the impact of temperature differences within the receiving cavity 1111 on the thickness rebound of the battery electrode 2.

[0280] In some embodiments, a circulating fan 29 is provided on the second pipeline 28, which can drive the gas to circulate.

[0281] In some embodiments, the heating mechanism 11 further includes a bearing 30, which is disposed outside the oven 111 and connected to the oven 111, and the transmission roller 27 is connected to the bearing 30.

[0282] By placing the bearing 30 outside the oven 111, the temperature of the bearing 30 can be reduced, the aging of the bearing 30 can be slowed down, the risk of the bearing 30 seizing can be reduced, and the reliability of the device can be improved.

[0283] Figure 9 is a schematic diagram of multiple drive rollers of a battery electrode processing apparatus provided in some embodiments of this application.

[0284] Referring to FIG9, in some embodiments, at least one first drive roller 27a is disposed opposite to a second drive roller 27b in the vertical direction Z.

[0285] In some embodiments, the number of first drive rollers 27a is the same as the number of second drive rollers 27b. Optionally, the first drive rollers 27a and the second drive rollers 27b are arranged in a one-to-one correspondence, and the corresponding first drive rollers 27a and the corresponding drive rollers 27b are arranged along the vertical direction Z.

[0286] In some embodiments, the diameter of the first drive roller 27a is the same as the diameter of the second drive roller 27b.

[0287] In some embodiments, along the conveying direction of the battery electrode 2, a portion of a plurality of first drive rollers 27a, a plurality of second drive rollers 27b, and the remaining portion of a plurality of first drive rollers 27a are arranged sequentially.

[0288] For example, there are two first drive rollers 27a and two second drive rollers 27b. The battery electrode 2 passes through one first drive roller 27a, two second drive rollers 27b and another first drive roller 27a in sequence. The battery electrode 2 has a U-shaped structure with the opening facing downward.

[0289] Alternatively, along the conveying direction of the battery electrode 2, a portion of the plurality of second drive rollers 27b, a plurality of first drive rollers 27a, and the remaining portions of the plurality of second drive rollers 27b are arranged sequentially. The battery electrode 2 has an upward-opening U-shaped structure.

[0290] Figure 10 is a schematic diagram of multiple drive rollers of a battery electrode processing apparatus provided in some embodiments of this application.

[0291] Referring to FIG10, in some embodiments, the first drive roller 27a and the second drive roller 27b are arranged alternately along the belt travel direction of the battery electrode 2.

[0292] Along the belt travel direction of the battery electrode 2, the battery electrode 2 can pass through the first drive roller 27a first, or it can pass through the second drive roller 27b first.

[0293] For example, the battery electrode 2 is routed in an N-shape.

[0294] Figure 11 is a schematic diagram of multiple drive rollers of a battery electrode processing apparatus provided in some embodiments of this application.

[0295] In some embodiments, along the conveying direction of the battery electrode 2, a plurality of first drive rollers 27a are located upstream or downstream of a plurality of second drive rollers 27b.

[0296] The battery electrode 2 can first pass through multiple first drive rollers 27a, and then through multiple second drive rollers 27b. Alternatively, the battery electrode 2 can first pass through multiple second drive rollers 27b, and then through multiple first drive rollers 27a.

[0297] For example, the battery electrode 2 is routed in a Z-shape.

[0298] Figure 12 is a schematic diagram of multiple drive rollers of a battery electrode processing apparatus provided in some embodiments of this application.

[0299] Referring to FIG12, in some embodiments, the first drive roller 27a and the second drive roller 27b do not overlap in the vertical direction Z.

[0300] When the battery electrode 2 travels between the first drive roller 27a and the second drive roller 27b, the battery electrode 2 can have a certain slope.

[0301] For example, the battery electrode 2 can be M-shaped or W-shaped.

[0302] Referring to Figures 1 to 12, this application provides a battery electrode processing device 1, which includes an unwinding mechanism 23, a rolling mechanism 10, a heating mechanism 11, a first thickness measuring mechanism 12, a first temperature measuring mechanism 13, a second thickness measuring mechanism 22, a second temperature measuring mechanism 18, a slitting mechanism 24, a winding mechanism 25, and a controller 16.

[0303] The unwinding mechanism 23 is used to unwind the battery electrode 2.

[0304] Along the belt-carrying direction of the battery electrode 2, the rolling mechanism 10, the second thickness measuring mechanism 22, the heating mechanism 11, the first thickness measuring mechanism 12, the slitting mechanism 24 and the winding mechanism 25 are arranged in sequence.

[0305] The rolling mechanism 10 is located downstream of the unwinding mechanism 23. There are two rolling mechanisms 10, each including two pressure rollers 101 arranged opposite each other. The battery electrode 2 is configured to pass between the two pressure rollers 101 for rolling the battery electrode 2.

[0306] The heating mechanism 11 includes an oven 111 and multiple heating elements 112. The oven 111 has a receiving cavity 1111 inside, and the multiple heating elements 112 are disposed in the receiving cavity 1111 and are used to heat the rolled battery electrode 2. The heating elements 112 are infrared lamps. The multiple heating elements 112 are divided into multiple pairs, and the battery electrode 2 passes through the pairs of heating elements 112.

[0307] The first temperature measuring mechanism 13 is disposed in the receiving cavity 1111 and located downstream of the heating element 112. The first temperature measuring mechanism 13 is used to measure the first temperature of the battery electrode 2. The second temperature measuring mechanism 18 is disposed in the receiving cavity 1111 and is used to detect the second temperature in the receiving cavity 1111.

[0308] The first thickness measuring mechanism 12 is disposed outside the oven 111 and is used to measure the first thickness of the battery electrode 2. The second thickness measuring mechanism 22 is disposed outside the oven 111 and is used to measure the second thickness of the battery electrode 2.

[0309] The battery electrode processing apparatus 1 also includes a plurality of adjusting components 14 disposed outside the oven 111, each adjusting component 14 being connected to at least two heating elements 112. The adjusting component 14 is a power modulator, which is used to adjust the power opening of the heating element 112.

[0310] The controller 16 includes a first PID controller 161, a second PID controller 162, and a third PID controller 163. The first PID controller 161 is configured to determine a first power adjustment amount for the power opening based on the target temperature of the battery electrode 2 and a first temperature. The second PID controller 162 is configured to determine a second power adjustment amount for the power opening based on a first thickness and a target thickness of the battery electrode 2. The third PID controller 163 is configured to adjust the target temperature based on the first thickness and the target thickness of the battery electrode 2.

[0311] The speed measuring mechanism 17 is installed in the roller pressing mechanism 10, and it obtains the conveying speed of the battery electrode 2 by detecting the rotational speed of one of the pressing rollers 101. The controller 16 determines the first power compensation amount based on the conveying speed of the battery electrode 2 and the second power compensation amount based on the second temperature.

[0312] The controller 16 generates signals based on the first power adjustment amount, the second power adjustment amount, the first power compensation amount, and the second power compensation amount to adjust the power opening of the heating element 112 through the power modulator.

[0313] The slitting mechanism 24 is used to slit the battery electrode sheet 2 into multiple electrode sheets. Multiple winding mechanisms 25 are disposed downstream of the slitting mechanism 24 and are used to wind up the multiple electrode sheets.

[0314] Figure 13 is a schematic diagram of a battery electrode processing control method provided in some embodiments of this application; Figure 14 is a logic control flowchart of a battery electrode processing control method provided in some embodiments of this application; Figure 15 is a PID control system diagram of a battery electrode processing control method provided in some embodiments of this application.

[0315] Referring to Figures 1, 13 to 15, embodiments of this application provide a battery electrode processing control method, which includes:

[0316] S10, Rolled-pressed battery electrode 2;

[0317] S20, Set the initial heating power setting P start And heat the rolled battery electrode 2;

[0318] S30, Obtain the first temperature T of the heated battery electrode 2. out and the first thickness Th out ;

[0319] S40, according to the first thickness Th out and the first temperature T out Determine the power adjustment amount;

[0320] S50, based on the initial heating power opening P start And power adjustment amount, adjust the actual heating power output P.

[0321] In step S50, the actual heating power opening P can be only compared with the initial heating power opening P. start It is related to the power adjustment amount; alternatively, the actual heating power opening P can also be related to other parameters.

[0322] In this embodiment, the compaction density of the battery electrode 2 can be increased by rolling it. Heating the battery electrode 2 can cause its thickness to rebound, releasing some of the stress accumulated inside the battery electrode 2 and reducing the risk of breakage in the subsequently manufactured electrode. Based on the first thickness Th... out and the first temperature T out It can adjust the actual heating power opening P in real time, thereby controlling the rebound thickness of the battery electrode 2, reducing the thickness difference of the battery electrode 2, and improving the thickness consistency of the battery electrode 2.

[0323] In some embodiments, there may be multiple heating elements 112. Optionally, during the processing of the battery electrode 2, the power opening of the multiple heating elements 112 is consistent. During the processing of the battery electrode 2, the control system synchronously adjusts the power opening of all heating elements 112.

[0324] In some embodiments, the battery electrode processing control method of this application can be applied to the battery electrode processing apparatus 1 provided in any of the foregoing embodiments.

[0325] In some embodiments, in step S10, the rolling mechanism 10 rolls the battery electrode 2. Optionally, two rolling mechanisms 10 perform secondary rolling on the electrode.

[0326] In some embodiments, in step S20, the initial heating power opening P start The power setting of the heating element 112 can be adjusted when the battery electrode 2 starts to move automatically.

[0327] In some embodiments, the initial heating power opening P in the current processing can be determined based on the power opening of the heating element 112 during the previous battery electrode 2 processing. start Assign a value. For example, the steady-state value of the actual heating power opening P in the previous process of processing battery electrode 2 can be used as the initial heating power opening P in this process. start .

[0328] In some embodiments, in step S40, the first temperature T out The first thickness Th can be measured by the first temperature measuring mechanism 13. out It can be measured by the first thickness measuring mechanism 12.

[0329] In some embodiments, the controller 16 may, based on the first thickness Th out and the first temperature T out Determine the power adjustment amount.

[0330] In some embodiments, the controller 16 may be based on the initial heating power opening P start The power adjustment amount is sent to the adjustment component 14, and the adjustment component 14 adjusts the actual heating power opening P of the heating element 112.

[0331] In some embodiments, step S40 includes step S41: based on the target temperature T of the battery electrode 2 target and the first temperature T out Determine the first power adjustment amount ΔP1.

[0332] Target temperature T target It can be a fixed temperature or a temperature that can be changed in real time during the processing of battery electrode 2.

[0333] For example, the temperature T during the previous battery electrode 2 processing can be used as a basis. out The target temperature T in this processing procedure target Assign a value. For example, as an example, the first temperature T during the processing of the previous battery electrode 2. out The steady-state value can be used as the target temperature T of battery electrode 2 during the start-up conveyor belt operation in this process. target .

[0334] The embodiments of this application can generate a first power adjustment amount ΔP1 based on the timely obtainable temperature information, thereby improving the system response speed, improving control accuracy, reducing the thickness difference of the battery electrode 2, and improving the thickness consistency of the battery electrode 2.

[0335] In some embodiments, the first PID controller 161 can determine the target temperature T based on the target temperature T.target and the first temperature T out Determine the first power adjustment amount ΔP1.

[0336] In some embodiments, step S40 further includes:

[0337] S42, according to the first thickness Th out and target thickness Th target Determine the second power adjustment amount ΔP2;

[0338] S43, according to the first thickness Th out and target thickness Th target Adjust the target temperature T target .

[0339] For example, the target thickness Th target This refers to the required thickness of battery electrode 2 after heating. For example, when the thickness of battery electrode 2 is Th... target When the thickness is ±B, the thickness of the battery electrode 2 meets the requirements, where B is the allowable error.

[0340] In this embodiment of the application, through the first thickness Th out and target thickness Th target It can both provide feedback to adjust the target temperature and obtain the second power adjustment amount ΔP2. The embodiments of this application, through the coordinated control of multiple control loops, are beneficial for improving the system's response speed, enhancing its anti-interference capability, and improving its control accuracy.

[0341] In some embodiments, the second PID controller 162 may be based on the first thickness Th out and target thickness Th target Determine the second power adjustment amount ΔP2.

[0342] In some embodiments, the third PID controller 163 may be based on the first thickness Th out and target thickness Th target Adjust the target temperature T target .

[0343] In some embodiments, the battery electrode processing control method further includes step S60: obtaining the belt-carrying speed V of the battery electrode 2, and determining a first power compensation amount ΔP based on the belt-carrying speed V. V Step S50 includes: based on the initial heating power opening P start Power regulation amount, first power compensation amount ΔP V Adjust the actual heating power output P.

[0344] The embodiments of this application can obtain the first power compensation amount ΔP in real time according to the speed change under variable speed conditions.V This allows for adjustment of the actual heating power opening P, reducing the impact of speed changes on the thickness rebound of battery electrode 2, lowering the risk of battery electrode 2 thickness exceeding the specification range, improving the thickness consistency of battery electrode 2, and reducing scrap.

[0345] In some embodiments, the conveyor speed V of the battery electrode 2 can be measured by the speed measuring mechanism 17.

[0346] In some embodiments, the battery electrode processing control method further includes step S70: obtaining a second temperature T inside the receiving cavity 1111 of the oven 111. t And according to the second temperature T t Determine the second power compensation amount ΔP T The heating element 112 for heating the battery electrode 2 is disposed in the receiving cavity 1111. Step S50 includes: based on the initial heating power opening P start Power regulation amount and second power compensation amount ΔP T Adjust the actual heating power output P.

[0347] This application embodiment can be based on a second temperature T. t The change yields the second power compensation amount ΔP. T This adjusts the actual heating power opening P, reduces the impact of internal temperature changes in the accommodating cavity 1111 on the thickness rebound of the battery electrode 2, improves the thickness consistency of the battery electrode 2, and reduces scrap.

[0348] In some embodiments, the second temperature T t It can be measured by the second temperature measuring device 18.

[0349] In some embodiments, step S50 includes: based on the initial heating power opening P start Power regulation amount, first power compensation amount ΔP V Second power compensation amount ΔP T The actual heating power output P is adjusted. In this embodiment, the actual heating power output P can be adjusted in real time according to the conveying speed V of the battery electrode 2 and the internal temperature of the receiving cavity 1111, so as to reduce the impact of speed changes and temperature changes in the receiving cavity 1111 on the thickness rebound of the battery electrode 2, improve the thickness consistency of the battery electrode 2, and reduce scrap.

[0350] In some embodiments, the battery electrode processing control method further includes:

[0351] S01. Obtain the initial ambient temperature T inside the cavity 1111 of the oven 111. s The heating element 112 for heating the battery electrode 2 is disposed in the receiving cavity 1111;

[0352] S02, compare the initial ambient temperature T s and preheating temperature T y ;

[0353] S03, at the initial ambient temperature T s Greater than or equal to the preheating temperature T y At that time, the rolling and heating of the battery electrode 2 begins.

[0354] For example, the initial ambient temperature T s The internal temperature of the receiving cavity 1111 before the battery electrode 2 begins automatic feeding can be considered. Optionally, the initial ambient temperature T... s It can be measured by the second temperature measuring device 18.

[0355] For example, the preheating temperature T y It can be a fixed value, or it can be the second temperature T during the processing of the previous battery electrode 2. t The steady-state value.

[0356] In this embodiment of the application, the interior of the oven 111 can be preheated before the battery electrode 2 processing is started, thereby improving heating efficiency and reducing the length of the battery electrode 2 that will be scrapped.

[0357] In some embodiments, the battery electrode processing control method further includes step S04: at an initial ambient temperature T s Less than the preheating temperature T y At that time, heating is carried out inside the receiving cavity 1111.

[0358] For example, the internal preheating of the receiving cavity 1111 can be achieved by heating with the heating element 112.

[0359] Optionally, during step S04, the power opening of the heating element 112 can be 100%.

[0360] The control logic in the battery electrode processing process is described below with a specific embodiment.

[0361] Referring to Figure 14, after the battery electrode 2 is in place, determine whether the ambient temperature meets the start-up adjustment requirements.

[0362] Specifically, the initial ambient temperature T inside the cavity 1111 of the oven 111 is obtained. s And compare the initial ambient temperature T s and preheating temperature T y At the initial ambient temperature T s Less than the preheating temperature T y When the heating element 112 is activated, the cavity 1111 is preheated until the initial ambient temperature T is reached. s Greater than or equal to the preheating temperature T y .

[0363] At the initial ambient temperature T s Greater than or equal to the preheating temperature T y At that time, the equipment starts to start. Specifically, the rolling mechanism 10 starts to roll the battery electrode 2, and the heating element 112 starts to heat the battery electrode 2.

[0364] Assign initial heating power and opening value P start Obtain the belt travel speed V of battery electrode 2, and calculate the first power compensation amount ΔP based on the belt travel speed V. V Obtain the second temperature T inside the receiving cavity 1111 of the oven 111. t And according to the second temperature T t Calculate the second power compensation amount ΔP T .

[0365] First temperature T out and the first thickness Th out The acquisition of this value has a certain lag. When the equipment is first started, the starting conditions for PID control are not yet met. Before PID control starts, the actual output heating power opening P = P0. start +ΔP V +ΔP T .

[0366] As the battery electrode 2 moves along the conveyor belt, the system begins to detect the first temperature T. out and the first thickness Th out PID control begins. The PID closed-loop control loop outputs ΔP1 and ΔP2. Specifically, PID control starts, and the PID closed loop operates at the target temperature T. target and the first temperature T out The first power regulation amount ΔP1 is determined, and the PID closed loop passes through the first thickness Th. out and target thickness Th target The second power adjustment ΔP2 is determined, and the PID closed loop passes through the first thickness Th. out and target thickness Th target Adjust the target temperature T target .

[0367] After the PID control is started, the actual output heating power opening P = P start +ΔP V +ΔP T +ΔP1+ΔP2.

[0368] In some embodiments, the second temperature may be higher than the first temperature under steady-state conditions.

[0369] Referring to Figure 15, in some embodiments, the PID closed-loop control loop includes a first closed-loop loop C1 and a second closed-loop loop C2.

[0370] For example, the first closed-loop circuit C1 adjusts the power of the heating element 112 based on the temperature of the battery electrode 2. The second closed-loop circuit C2 adjusts the target temperature of the battery electrode 2 based on its thickness and directly adjusts the power of the heating element 112 based on its thickness.

[0371] In some embodiments, in the first closed-loop circuit C1, the first PID controller 161 determines the target temperature T based on the target temperature T. target and the first temperature T measured out The first power adjustment amount ΔP1 is determined; based on the first power adjustment amount ΔP1 and the power compensation adjustment amount d, the power opening degree of the heating element 112 is adjusted. When the power opening degree changes, the first temperature T... out It may also change accordingly.

[0372] In the first closed-loop circuit C1, the first temperature T is continuously measured. out This information is then fed back to the first PID controller 161. As the first PID controller 161 continuously adjusts the temperature T... out It can reach a stable state after a period of time.

[0373] For example, d = ΔP V +ΔP T .

[0374] For example, in Figure 15, G p1 It can be a transfer function.

[0375] For example, combined with the initial heating power opening P start Adjust the actual heating power setting P.

[0376] In some embodiments, in the second closed-loop circuit C2, the second PID controller 162 determines the thickness Th based on the first thickness Th. out and target thickness Th target The second power adjustment amount ΔP2 is determined; based on the first power adjustment amount ΔP2 and the power compensation adjustment amount d, the power opening of the heating element 112 is adjusted. When the power opening changes, the first thickness Th... out It may also change accordingly.

[0377] The second PID controller 162 is based on the first thickness Th out and target thickness Th target Adjust the target temperature T target Target temperature T target When the temperature changes, the first PID controller 161 will adjust the temperature according to the target temperature T. target and the first temperature T out Adjust the first power adjustment amount ΔP1 until the first temperature T is reached.out It has reached a stable state again.

[0378] In the second closed-loop circuit C2, the first thickness Th is continuously measured. out This information is then fed back to the second PID controller 162 and the third PID controller 163. With the continuous adjustment of the first PID controller 161, the second PID controller 162, and the third PID controller 163, after a period of time, the first temperature T... out and the first thickness Th out A stable state has been reached.

[0379] For example, in Figure 15, G p2 It can be a transfer function.

[0380] In this embodiment, the control system is designed as a cascaded PID controller, where the first closed loop C1 and the second closed loop C2 can be controlled in a coordinated manner, which effectively improves the system response speed, enhances the system's anti-interference capability, and improves the system's control accuracy.

[0381] In some embodiments, the first closed-loop circuit C1 may employ fuzzy PID control to effectively address the inertia and hysteresis of the system.

[0382] In some embodiments, the first temperature measuring mechanism 13 is disposed inside the oven 111, and the first thickness measuring mechanism 12 is disposed outside the oven 111.

[0383] Since the first thickness measuring mechanism 12 is spaced a certain distance from the oven 111, the thickness data measured by the first thickness measuring mechanism 12 (i.e., the first thickness Th) is... out It has a certain degree of lag. The first temperature measuring mechanism 13 is set inside the oven 111, close to the heating element 112, so that temperature data (first temperature T) can be collected earlier. out ).

[0384] When the battery electrode processing device 1 starts up, the first closed-loop circuit C1 can, before measuring the thickness data, determine the first temperature T of the battery electrode 2. out Adjusting the power setting of the heating element 112 effectively addresses control lag and reduces the scrap rate of battery electrodes 2. The first thickness Th is measured... out After obtaining the data, the first closed-loop circuit C1 and the second closed-loop circuit C2 can be controlled in a coordinated manner, which can effectively improve the system response speed, enhance the system's anti-interference capability, and improve the system's control accuracy.

[0385] In this embodiment, the power of the infrared lamp is adjusted in real time based on the thickness value and temperature value of the battery electrode 2. This controls the heat release of the lamp and causes the battery electrode 2 to rebound to the target thickness, reducing the risk of the battery electrode 2 thickness exceeding the specification range. By controlling the stable power of the infrared lamp, the thickness difference of the battery electrode 2 in the belt-running direction (longitudinal direction) is reduced, thus improving the thickness consistency of the battery electrode 2.

[0386] In some embodiments, the power compensation adjustment amount may be as follows.

[0387] 1) During the processing of battery electrodes, the conveyor speed of the battery electrodes is divided into n speed segments (1-n).

[0388] 2) By building a model using a large amount of data, reference power openings (P1, P2, ..., P) can be obtained for different speed ranges. n The relationship between ).

[0389] The steady-state ambient temperature of an oven can refer to a relatively stable internal temperature reached during stable heating and operation. For example, the steady-state ambient temperature of an oven can be a second temperature T. t Temperature at steady state.

[0390] The reference power opening can be: under steady-state oven ambient temperature, causing the battery electrode to rebound to the target thickness Th. target The heating power setting.

[0391] For example, P1 = K1 × P2, P2 = K2 × P3, P3 = K3 × P4

[0392] … P n-1 =K n-1 ×P n .

[0393] 3) Once the oven is running stably and the conditions for obtaining the reference power opening are met, the heating power opening at the current speed segment is recorded as the reference power opening for that speed segment. Using the reference power opening relationship coefficients (e.g., K1, K2, etc.) for each speed segment, the reference power openings for other speed segments are calculated. Based on the reference power openings, compensation is applied to the current heating power opening at each speed segment (e.g., calculating the speed power compensation amount ΔP). V ).

[0394] Each battery electrode roll is sampled once, and the reference power opening coefficients (such as K1, K2, etc.) are adjusted. This allows for automatic adjustment of the reference power opening value as production progresses, thereby improving control accuracy.

[0395] The embodiments of the present application may develop an algorithm for compensating the power opening of a heating element for the speed changing process under variable speed working conditions, compensate the power opening of the infrared lamp in real time according to speed changes, improve heating uniformity, and improve the thickness consistency after thickness rebound of battery pole pieces.

[0396] In some embodiments, the preheating temperature T of the oven y , the steady-state oven ambient temperature T W , the real-time operating ambient temperature T t (for example, it may be the measured second temperature), the set power for ambient temperature compensation is P T . The temperature power compensation ΔP is obtained through the data model of power opening and the internal ambient temperature of the oven T . ΔP T =P T ×f(T y ,T w ,T t ,k'), where k' is a fitted relational parameter.

[0397] Models are established according to different speed segments, and the temperature power compensation corresponding to each speed segment is ΔP T1 , ΔP T2 , ..., ΔP Tn .

[0398] In some embodiments, a lower limit of power opening for the acceleration process and an upper limit of power opening for the acceleration process can be set during the acceleration process of the battery pole piece. The lower limit of power opening for the acceleration process is: a lower limit limitation on the output heating power opening during the variable speed acceleration process of the battery pole piece; the upper limit of power opening for the acceleration process is: an upper limit limitation on the output heating power opening during the variable speed acceleration process of the battery pole piece.

[0399] In some embodiments, corresponding compensation values a and b (a < b) are added based on the reference power opening of each speed segment, and combined with the temperature power compensation, the lower limit value and upper limit value of power opening during the acceleration process are obtained. The values of a corresponding to each speed segment are a1, a2, ..., a n , and the values of b corresponding to each speed segment are b1, b2, ..., b n .

[0400] Exemplarily, the lower limit of power opening in the acceleration process is: P L1 =P1+k1×a1+ΔP T1 P L2 =P2+k1×a2+ΔP T2

[0401] ... P Ln =P n +k1×a n+ΔP Tn .

[0402] Lower limit of power opening during acceleration process: A lower limit for the output heating power opening during the speed change and acceleration process of the equipment.

[0403] P L1 P is the lower limit of the power opening under the condition that the speed range is 1. Ln This is the lower limit of the power opening under the condition of speed range n.

[0404] The maximum power opening during acceleration is: P U1 =P1 + k2 × b1 + ΔP T1 P U2 =P² + k² × b² + ΔP T2

[0405] ... P Un =P n +k2×b n +ΔP Tn .

[0406] P U1 P is the upper limit of the power opening under the condition that the speed range is 1. Un This represents the upper limit of the power opening under the condition of speed range n.

[0407] The values ​​of k1 and k2 are adjustable. For example, the values ​​of k1 and k2 can be manually set according to the requirements of the battery electrodes.

[0408] The embodiments of this application can enhance control stability by setting an upper and lower limit of the power opening during the acceleration process of the battery electrode.

[0409] In this embodiment of the application, by identifying the conveyor speed of the battery electrode and the internal ambient temperature of the oven, the heating power can be compensated in real time to heat the battery electrode instantly and improve the thickness consistency of the battery electrode after thickness rebound.

[0410] Figure 16 is a schematic diagram of the first closed-loop circuit of the battery electrode processing control method provided in some embodiments of this application.

[0411] Referring to Figure 16, in some embodiments, the parameters of the PID can be adjusted by fuzzy logic in the first closed-loop circuit.

[0412] This application embodiment can optimize the proportional coefficient, integral coefficient, and derivative coefficient of the PID controller in real time by defining a fuzzy set of input quantities (error e and error change rate ec) and output variables (Δu1(k), Δu2(k), Δu3(k)), formulating a fuzzy rule table, determining a fuzzy inference method, and performing fuzzification and defuzzification. This enables the control system to better adapt to different working conditions and changes in object characteristics, thereby improving the system's response speed, stability, accuracy, and other control performance.

[0413] The embodiments of this application can instantly heat the battery electrode, control the temperature of the battery electrode, achieve fast response, suppress overshoot, improve stability and control accuracy, and improve product yield.

[0414] In some embodiments, the first PID controller is an incremental PID controller, whose output is the increment of the control quantity, i.e., the difference between the current control quantity and the previous control quantity. Its calculation formula is:

[0415] Δu(k)=Δu1(k)+Δu2(k)+Δu3(k), where Δu1(k)=Kp[e(k)-e(k-1)], Δu2(k)=Ki×e(k), Δu3(k)=Kd[e(k)-2e(k-1)+e(k-2)]. That is, Δu(k)=Kp[e(k)-e(k-1)]+Ki×e(k)+Kd[e(k)-2e(k-1)+e(k-2)].

[0416] Δu(k) is the control increment at the kth sampling time; Kp is the proportional coefficient; Ki is the integral coefficient; Kd is the derivative coefficient; e(k) is the temperature deviation at the kth sampling time; e(k-1) is the temperature deviation at the (k-1)th sampling time; e(k-2) is the temperature deviation at the (k-2)th sampling time.

[0417] In some embodiments, as shown in Figure 16, the fuzzy PID optimizes the proportional coefficient, integral coefficient, and derivative coefficient of the PID in real time by defining fuzzy sets of input and output variables, formulating fuzzy rule tables, determining fuzzy inference methods, and performing fuzzification and defuzzification.

[0418] In some embodiments, the fuzzy sets of input and output variables can be defined as follows.

[0419] Fuzzy set definition: negative large (nb), negative medium (nm), negative small (ns), zero (zo), positive small (ps), positive medium (pm), positive large (pb).

[0420] Input variables:

[0421] The error e is a fuzzy set (-a, a), with a subset of a. nb anm a ns a zo a ps a pm a pb ;

[0422] The error change rate ec is a fuzzy set (-b, b), with a subset of b. nb b nm b ns b zo b ps b pm b pb .

[0423] Output variables:

[0424] The fuzzy set Δu1(k) is (-c, c), and its subset is c. nb c nm c ns c zo c ps c pm c pb ;

[0425] The fuzzy set Δu2(k) is (-d, d), and its subset is d. nb d nm d ns d zo d ps d pm d pb ;

[0426] The fuzzy set Δu3(k) is (-f, f), and its subset is: f nb f nm f ns f zo f ps f pm f pb .

[0427] In some embodiments, output adjustment strategies corresponding to different input combinations are determined based on system characteristics. This application's embodiments consider requirements such as system dynamic performance, stability, and robustness, and optimize and adjust rules through experiments and simulations to formulate fuzzy rule tables to improve control effectiveness.

[0428] In some embodiments, the fuzzy rule table for Δu1(k) is shown in Table 1:

[0429] Table 1

[0430] In some embodiments, the fuzzy rule table for Δu2(k) is shown in Table 2:

[0431] Table 2

[0432] In some embodiments, the fuzzy rule table for Δu3(k) is shown in Table 3:

[0433] Table 3

[0434] In some embodiments, the Takagi-Sugeno inference method is used for fuzzy inference.

[0435] The Takagi-Sugeno inference method is based on piecewise linear modeling of input and output variables to achieve the design of control systems.

[0436] Specifically, the Takagi-Sugeno fuzzy inference method consists of two steps. First, the input domain is divided into several fuzzy subsets, and a linear model is built for each subset. These linear models are represented in the form of conditional statements. Then, these conditional statements are weighted and summed to obtain the fuzzy output value of the output variable. In Takagi-Sugeno type fuzzy rules, a typical rule form is: if input variable A is A1 and input variable B is B1, then output variable Y = f(A,B). Here, f(A,B) is usually a linear combination of the input variables.

[0437] In some embodiments, the precise input value can be converted into a fuzzy value, and a fuzzy output result can be obtained through fuzzy inference. Finally, the fuzzy output result can be converted into a precise adjustment value.

[0438] Input values ​​are e and ec, respectively. Using fuzzy rules, x is obtained through fuzzy inference. 1、 x 2、 x3, and finally output the values ​​of Kp, Ki, and Kd to obtain the precise adjustment value.

[0439] Kp = Kp1 × x1, Ki = Ki1 × x2, Kd = Ki1 × x3, where Kp1 is a proportional coefficient that can be set and adjusted; Ki1 is an integral coefficient that can be set and adjusted; and Kd1 is a derivative coefficient that can be set and adjusted.

[0440] In some embodiments, the value of x1 is calculated as follows.

[0441] When ec > 0, f(ec) is calculated according to a in Table 1 of the fuzzy rule table. ps Okay, so we can get f(ec) = A × ec + B; k1 × c ns =A×b ps +B; k2×c nb =A×b pb +B; A=(k1×cns -k2×c nb ) / (b ps -b pb B = k1 × c ns -b ps ×(k1×c ns -k2×c np ) / (b ps -b pb );

[0442] Then: f(ec)=(k1×c ns -k2×c nb ) / (b ps -b pb )×ec+k1×c ns -b ps ×(k1×c ns -k2×c nb ) / (b ps -b pb ).

[0443] When ec < 0, f(ec) is calculated according to table 1 of the fuzzy rule table, a. ps Okay, we can get f(ec) = A×ec + B k1×c ps =A×b ps +B; k2×c pb =A×b pb +B; A=(k1×c ps -k2×c pb ) / (b ps -b pb B = k1 × c ps -b ps ×(k1×c ps -k2×c pb ) / (b ps -b pb );

[0444] Then: f(ec)=(k1×c ps -k2×c pb ) / (b ps -b pb )×ec+k1×c ps -b ps ×(k1×c ps -k2×c pb ) / (b ps -b pb ).

[0445] When e>0, f(e) is calculated according to b in Table 1 of the fuzzy rule table. pbFrom this, we can obtain f(e) = A × e + B; k1 × c ns =A×a pb +B; k2×c nb =A×a ps +B;

[0446] A and B can be obtained: A = (k1 × c ns -k2×c nb ) / (a pb -a ps B = k1 × c ns -a pb ×(k1×c ns -k2×c nb ) / (a pb -a ps )

[0447] Then: f(e)=(k1×c ns -k2×c nb ) / (a pb -a ps )×e+k1×c ns -a pb ×(k1×c nc -k2×c nb ) / (a pb -a ps ).

[0448] When e < 0, f(e) is calculated according to b in Table 1 of the fuzzy rule table. pb From this, we can obtain f(e) = A × e + B; k1 × c ps =A×a nb +B; k2×c pb =A×a ns +B;

[0449] A and B can be obtained: A = (k1 × c ps -k2×c pb ) / (a nb -a ns B = k1 × c ps –a nb ×(k1×c ps -k2×c pb ) / (a nb -a ns );

[0450] Then: f(e)=(k1×c ps -k2×c pb ) / (a nb -a ns )×e+k1×c ps –anb ×(k1×c ps -k2×c pb ) / (a nb -a ns ).

[0451] When ec<0 and e>0, x1=f(ec); x1=(k1×c ps -k2×c pb ) / (b ps -b pb )×ec+k1×c ps -b ps ×(k1×c ps -k2×c pb ) / (b ps -b pb );

[0452] When ec<0 and e<0, x1=f(e,ec)=f(e)×f(ec) x1=[(k1×c ps -k2×c pb ) / (a nb -a ns )×e+k1×c ps –a nb ×(k1×c ps -k2×c pb ) / (a nb -a ns )]×[(k1×c ps -k2×c pb ) / (b ps -b pb )×ec+k1×c ps -b ps ×(k1×c ps -k2×c pb ) / (b ps -b pb )];

[0453] When ec>0 and e<0, x1=f(ec); x1=(k1×c ns -k2×c nb ) / (a pb -a ps )×e+k1×c ns -a pb ×(k1×c nc -k2×c nb ) / (a pb -a ps );

[0454] When ec > 0 and e > 0, x1 = f(e, ec) = f(e) × f(ec); x1 = [(k1 × c ns -k2×c nb ) / (a pb -a ps )×e+k1×c ns -a pb ×(k1×c nc -k2×c nb ) / (a pb -a ps )]×[(k1×c ns -k2×c nb ) / (a pb -a ps )×e+k1×c ns -a pb ×(k1×c nc -k2×c nb ) / (a pb -a ps )).

[0455] In some embodiments, the value of x2 is calculated as follows.

[0456] When ec > 0, according to table 2 of the fuzzy rule table, a pb Similarly, we can obtain: f(ec)=(k1×d) pb -k2×d ps ) / (b ps -b pb )×ec+k1×c ps -b ps ×(k1×d pb -k2×d ps ) / (b ps -b pb );

[0457] When ec < 0, according to table 2 of the fuzzy rule table, a nb Similarly, we can obtain: f(ec)=(k1×d) ns -k2×d np ) / (b nb -b ns )×ec+k1×c ps -b nb ×(k1×d ns -k2×d np ) / (b nb -b ns );

[0458] When e > 0, according to table 2 of the fuzzy rule table, b psSimilarly, we can obtain: f(e)=(k1×d) ps -k2×d pb ) / (a ps -a pb )×e+k1×d ps -a ps ×(k1×d ps -k2×d pb ) / (a ps -a pb );

[0459] When e < 0, according to table 2 of the fuzzy rule table, b ns Similarly, we can obtain: f(e)=(k1×d) nb -k2×d ns ) / (a nb -a ns )×e+k1×d nb -a nb ×(k1×d nb -k2×d ns ) / (a nb -a ns ).

[0460] When e>0 and ec>0, x2=f(e,ec)=f(e)×f(ec); x2=[(k1×d ps -k2×d pb ) / (a ps -a pb )×e+k1×d ps -a ps ×(k1×d ps -k2×d pb ) / (a ps -a pb )]×[(k1×d pb -k2×d ps ) / (b ps -b pb )×ec+k1×c ps -b ps ×(k1×d pb -k2×d ps ) / (b ps -b pb )];

[0461] When e > 0 and ec < 0, x2 = f(e); x2 = f(e) = (k1 × d ps -k2×d pb ) / (a ps -a pb )×e+k1×d ps -aps ×(k1×d ps -k2×d pb ) / (a ps -a pb );

[0462] When e < 0 and ec > 0, x2 = f(e); x2 = (k1 × d nb -k2×d ns ) / (a nb -a ns )×e+k1×d nb -a nb ×(k1×d nb -k2×d ns ) / (a nb -a ns );

[0463] When e < 0 and ec < 0, x2 = f(e, ec) = f(e) × f(ec); x2 = [(k1 × d nb -k2×d ns ) / (a nb -a ns )×e+k1×d nb -a nb ×(k1×d nb -k2×d ns ) / (a nb -a ns )]×[(k1×d ns -k2×d np ) / (b nb -b ns )×ec+k1×c ps -b nb ×(k1×d ns -k2×d np ) / (b nb -b ns )).

[0464] In some embodiments, the value of x3 is calculated as follows.

[0465] x3 is only related to e, x3 = f(e);

[0466] When e > 0, according to table 2 of the fuzzy rule table, b ps Similarly, we can obtain: x3 = f(e) = (k1 × f pb -k2×f ps ) / (a pb -a ps )×e+k1×f pb -a pb ×(k1×fpb -k2×f ps ) / (a pb -a ps );

[0467] When e < 0, according to table 2 of the fuzzy rule table, b ns Similarly, we can obtain: x3 = f(e) = (k1 × f nb -k2×f ns ) / (a nb -a ns )×e+k1×f nb -a nb ×(k1×f nb -k2×f ns ) / (a nb -a ns ).

[0468] In the formulas for calculating x1, x2, and x3, k1 and k2 are proportionality coefficients, which can be adjusted according to the actual effect.

[0469] Substitute x according to different intervals of e and ec 1、 The values ​​of x2 and x3 are respectively used to obtain the specific values ​​of Kp, Ki and Kd, where Kp = Kp1 × x1, Ki = Ki1 × x2, and Kd = Ki1 × x3.

[0470] In this embodiment, the input domain is divided into positive and negative sets to establish corresponding linear models.

[0471] In some embodiments, the input domain can be subdivided into each subset to establish a corresponding linear model. Subdividing the input domain into subsets to establish linear models can further improve the stability of the control system.

[0472] Figure 17 is a schematic diagram of a battery electrode thickness pre-rebound processing method provided in some embodiments of this application.

[0473] Referring to Figures 1 and 17, an embodiment of this application provides a method for pre-rebound processing of battery electrode thickness, which includes:

[0474] S100: Roll the coated battery electrode 2 to make the thickness of the battery electrode 2 the first target thickness Th1.

[0475] S200, The battery electrode 2 with a first target thickness Th1 is heated so that the thickness of the battery electrode 2 rebounds to a second target thickness Th2; wherein the second target thickness Th2 is greater than the first target thickness Th1.

[0476] In this embodiment, by rolling the thickness of the battery electrode 2 to a first target thickness Th1, the compaction density of the battery electrode 2 can be increased. Heating the battery electrode 2 can cause its thickness to rebound to a second target thickness Th2, releasing some of the stress accumulated inside the battery electrode 2 and reducing the risk of subsequent electrode breakage.

[0477] The second target thickness Th2 is less than the thickness of the battery electrode 2 before rolling.

[0478] In some embodiments, the battery electrode thickness pre-rebound processing method of this application can be applied to the battery electrode processing apparatus 1 provided in any of the foregoing embodiments.

[0479] In some embodiments, the thickness detected by the second thickness measuring mechanism 22 can be used to determine whether the thickness of the battery electrode 2 after rolling reaches the first target thickness Th1. Optionally, the first target thickness Th1 can be a thickness range.

[0480] In some embodiments, the thickness of the battery electrode 2 can be detected by the first thickness measuring mechanism 12 to determine whether the thickness of the battery electrode 2 after heating reaches the second target thickness Th2.

[0481] In some embodiments, the second target thickness Th2 may be a thickness range, for example, Th target -B≤Th2≤Th target +B. B represents the allowable thickness error.

[0482] In some embodiments, during the rolling process of the coated battery electrode 2, the temperature of the battery electrode 2 is 18°C-30°C. Optionally, during the rolling process of the battery electrode 2, the ambient temperature of the battery electrode 2 is 18°C, 20°C, 22°C, 24°C, 25°C, 26°C, 28°C, or 30°C.

[0483] In some embodiments, in the step of heating the battery electrode 2 having a first target thickness Th1, the temperature of the battery electrode 2 after heating is 80°C-250°C.

[0484] As an example, the first temperature measuring mechanism 13 can be used to measure the temperature of the battery electrode 2 after it has been heated.

[0485] As an example, the temperature of the battery electrode 2 after heating can be 80°C, 100°C, 120°C, 150°C, 180°C, 200°C, 120°C or 250°C.

[0486] From the rolling stage to the heating stage, the temperature of the battery electrode 2 increases significantly; as the temperature increases, the thickness of the battery electrode 2 rebounds.

[0487] In some embodiments, the ratio α of the second target thickness Th2 to the first target thickness Th1 is 1.02-1.1.

[0488] As an example, α is 1.02, 1.03, 1.04, 1.05, 1.06, 1.07, 1.08, 1.09 or 1.1.

[0489] In this embodiment, the ratio of the second target thickness Th2 to the first target thickness Th1 is set to be greater than or equal to 1.02, which can release some of the stress accumulated inside the battery electrode 2 and reduce the risk of subsequent electrode breakage. In this embodiment, the ratio of the second target thickness Th2 to the first target thickness Th1 is set to be less than or equal to 1.1, which can reduce the impact of thickness rebound on the compaction density of the battery electrode 2.

[0490] In some embodiments, step S100 includes:

[0491] S110. Unwind the coated battery electrode 2.

[0492] S120. The battery electrode 2 is rolled at least once along the belt direction of the battery electrode 2.

[0493] For example, the unwinding mechanism 23 can perform step S110. The roll of battery electrode 2 can be placed in the unwinding mechanism 23, and the unwinding mechanism 23 unwinds the battery electrode 2.

[0494] For example, the rolling mechanism 10 can roll the battery electrode 2.

[0495] In some embodiments, the battery electrode 2 may be rolled twice in step S120.

[0496] In some embodiments, step S200 includes:

[0497] S210, Set the initial heating power setting P start The battery electrode 2 with a first target thickness Th1 is heated;

[0498] S220, Obtain the thickness Th of the heated battery electrode 2. out and the first temperature T out ;

[0499] S230, according to the thickness Th of battery electrode 2 out and the first temperature T out Determine the power adjustment amount;

[0500] S240, based on the initial heating power opening P startThe power adjustment amount is adjusted to adjust the actual heating power opening P of the output so that the thickness of the battery electrode 2 rebounds to the second target thickness Th2.

[0501] In this embodiment of the application, based on the thickness Th of the battery electrode 2 out and the first temperature T out It can adjust the actual heating power opening P in real time, thereby controlling the rebound thickness of the battery electrode 2, reducing the thickness difference of the battery electrode 2, and improving the thickness consistency of the battery electrode 2.

[0502] For example, in the detected thickness Th of the battery electrode 2 out When the thickness falls within the range of the second target thickness Th2, the thickness rebound of the battery electrode 2 is qualified.

[0503] In some embodiments, step S230 includes:

[0504] S231, Based on the target temperature T of battery electrode 2 target and the first temperature T out Determine the first power adjustment amount ΔP1;

[0505] S232, based on the thickness Th of battery electrode 2 out Based on the second target thickness Th2, determine the second power adjustment amount ΔP2;

[0506] S233, based on the thickness Th of battery electrode 2 out Second target thickness Th2, adjust target temperature T target .

[0507] In this embodiment of the application, by obtaining the first temperature T out And the thickness Th of battery electrode 2 out It can achieve coordinated control of multiple control loops, which is beneficial to improve the system's response speed, enhance the system's anti-interference ability, and improve the system's control accuracy.

[0508] In some embodiments, the battery electrode thickness pre-rebound treatment method further includes:

[0509] S300: Obtain the belt speed V of battery electrode 2, and determine the first power compensation amount ΔP based on the belt speed V. V ;

[0510] S400, Obtain the second temperature T inside the receiving cavity 1111 of the oven 111. t And according to the second temperature T t Determine the second power compensation amount ΔP T The heating element 112 for heating the battery electrode 2 is disposed in the receiving cavity 1111.

[0511] Step S240 includes: based on the initial heating power opening P start Power regulation amount, first power compensation amount ΔP V Second power compensation amount ΔP T Adjust the actual heating power output P so that the thickness of the battery electrode 2 rebounds to the second target thickness Th2.

[0512] In this embodiment, the conveying speed V of the battery electrode 2 and the second temperature T inside the receiving cavity 1111 can be considered. t The actual heating power opening P is adjusted in real time to reduce the impact of speed changes and temperature changes in the cavity 1111 on the thickness rebound of the battery electrode 2, improve the thickness consistency of the battery electrode 2, and reduce scrap.

[0513] In some embodiments, the battery electrode 2 includes a plurality of active material coating areas 2c along its width direction W.

[0514] In some embodiments, the battery electrode thickness pre-rebound processing method further includes step S500: along the conveying direction of the battery electrode 2, the battery electrode 2, whose thickness has been rebounded to a second target thickness Th2, is cut according to a preset width of the active material coating area of ​​the battery cell to form multiple electrodes for manufacturing battery cells. By cutting, both the production efficiency of the electrode can be improved, and the consistency of the electrode size can also be improved.

[0515] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. 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 battery electrode processing apparatus, comprising: Roll forming mechanism, used for rolling battery electrodes; A heating mechanism includes an oven and a heating element. The oven has a receiving cavity inside, and the heating element is disposed in the receiving cavity and used to heat the rolled battery electrode sheets. The first thickness measuring mechanism is located downstream of the heating element and is used to measure the first thickness of the battery electrode sheet; as well as A first temperature measuring mechanism is located downstream of the heating element and is used to measure the first temperature of the battery electrode.

2. The battery pole piece processing apparatus of claim 1, wherein, The heating element includes at least one of an infrared heating element, an electromagnetic heating element, and a hot air heating element.

3. The battery pole piece processing apparatus according to claim 1 or 2, wherein, The heating mechanism includes a plurality of the heating elements.

4. The battery pole piece processing apparatus of claim 3, wherein, Multiple heating elements are respectively disposed on both sides of the battery electrode.

5. The battery pole piece processing apparatus of any one of claims 1-4, wherein, The heating mechanism includes a support frame, which is disposed inside the oven, and the heating element is disposed on the support frame.

6. The battery pole piece processing apparatus of claim 5, wherein, The heating mechanism includes a guide connected to the oven, and the bracket is movably disposed on the guide; The bracket is configured to move the heating element closer to or away from the battery electrode by means of movement.

7. The battery pole piece processing apparatus of claim 5 or 6, wherein, There are multiple brackets, and at least one heating element is installed on each bracket.

8. The battery pole piece processing apparatus of any of claims 5-7, wherein, The heating mechanism further includes a baffle plate disposed on the bracket along the carrying direction of the battery electrode sheet, and the baffle plate is disposed on at least one side of the heating element.

9. The battery pole piece processing apparatus of any one of claims 1-8, wherein, The heating mechanism includes a plurality of drive rollers disposed in the receiving cavity, the plurality of drive rollers being used to guide the battery electrode sheets on the conveyor belt; The heating element is disposed between at least two adjacent drive rollers along the belt travel direction of the battery electrode.

10. The battery pole piece processing apparatus of claim 9, wherein, The plurality of drive rollers includes a plurality of first drive rollers and a plurality of second drive rollers. The plurality of first drive rollers are arranged in a horizontal direction, and the plurality of second drive rollers are arranged in a horizontal direction. In the vertical direction, the second drive rollers are higher than the first drive rollers.

11. The battery pole piece processing apparatus of claim 10, wherein, Along the belt travel direction of the battery electrode, the first drive roller and the second drive roller are arranged alternately; or Along the belt-carrying direction of the battery electrode, the plurality of first drive rollers are located upstream or downstream of the plurality of second drive rollers.

12. The battery pole piece processing apparatus of claim 10 or 11, wherein, In the vertical direction, the first drive roller and the second drive roller do not overlap.

13. The battery pole piece processing apparatus of any of claims 9-12, wherein, The heating mechanism also includes a bearing, which is disposed outside the oven and connected to the oven, and the transmission roller is connected to the bearing.

14. The battery electrode processing apparatus according to any one of claims 1-13, comprising an adjustment component connected to at least one of the heating elements; The adjusting component is configured to adjust the power setting of the heating element based on the first thickness and the first temperature.

15. The battery pole piece processing apparatus of claim 14, wherein, The heating element is configured as a plurality of components, and the adjusting component is configured as a plurality of components, each of the adjusting components being connected to at least one heating element.

16. The battery pole piece processing apparatus of claim 15, wherein, Each of the adjustment components is connected to at least two of the heating elements, and the heating elements connected to one of the adjustment components form a heating group; Multiple heating groups are arranged sequentially along the belt direction of the battery electrode.

17. The battery pole piece processing apparatus of any of claims 14-16, wherein, The regulating component includes a power modulator configured to adjust the power opening of the heating element by changing the electrical power output.

18. The battery pole piece processing apparatus of any of claims 14-17, wherein, The adjustment component is located outside the oven.

19. The battery electrode processing apparatus according to any one of claims 14-18, comprising a controller configured to control the adjusting member based on the first thickness and the first temperature to adjust the power opening of the heating element.

20. The battery pole piece processing apparatus of claim 19, wherein, The controller includes a first PID controller, which is configured to determine a first power adjustment amount of the power opening based on the target temperature of the battery electrode and the first temperature.

21. The battery pole piece processing apparatus of claim 20, wherein, The controller includes a second PID controller configured to determine a second power adjustment amount of the power opening based on the first thickness and the target thickness of the battery electrode.

22. The battery pole piece processing apparatus of claim 21, wherein, The controller includes a third PID controller configured to adjust the target temperature based on the first thickness and the target thickness of the battery electrode.

23. The battery electrode processing apparatus according to any one of claims 14-22, comprising a speed measuring mechanism, the speed measuring mechanism being disposed upstream of the heating mechanism and used to detect the conveying speed of the battery electrode; The adjusting component is also configured to adjust the power setting of the heating element according to the belt conveyor speed.

24. The battery pole piece processing apparatus of claim 23, wherein, The rolling mechanism includes two pressure rollers arranged opposite to each other, and the two pressure rollers are used to roll the battery electrode sheets; The speed measuring mechanism obtains the belt conveyor speed by detecting the rotational speed of one of the pressure rollers.

25. The battery electrode processing apparatus according to any one of claims 14-24, further comprising a second temperature measuring mechanism, the second temperature measuring mechanism being disposed within the receiving cavity and used to detect a second temperature within the receiving cavity; The regulating component is also configured to adjust the power setting of the heating element according to the second temperature.

26. The battery pole piece processing apparatus of claim 25, wherein, The heating mechanism includes a plurality of second temperature measuring mechanisms arranged in a vertical direction.

27. The battery pole piece processing apparatus of any of claims 1-26, wherein, The first temperature measuring mechanism is disposed in the receiving cavity; The battery electrode processing device further includes a protective sleeve, a first cooling mechanism, and a first pipeline. The protective sleeve is disposed outside the first temperature measuring mechanism, the first cooling mechanism is disposed outside the oven and is used to provide a cooling medium, and the first pipeline connects the protective sleeve and the first cooling mechanism.

28. The battery pole piece processing apparatus of any of claims 1-27, wherein, The oven has a first opening and a second opening, the first opening communicating with the top of the receiving cavity and the second opening communicating with the bottom of the receiving cavity; The battery electrode processing device further includes a second pipeline located outside the oven and connecting the first opening and the second opening.

29. The battery electrode processing apparatus according to any one of claims 1-28, further comprising a second cooling mechanism connected to the oven and used to cool the heating element.

30. The battery pole piece processing apparatus of any one of claims 1-29, wherein, The first thickness measuring mechanism is located on the outside of the oven.

31. The battery electrode processing apparatus according to any one of claims 1-30 further includes a second thickness measuring mechanism, the second thickness measuring mechanism being disposed between the rolling mechanism and the heating mechanism, and used to measure the thickness of the battery electrode.

32. The battery electrode processing apparatus according to any one of claims 1-31, further comprising: An unwinding mechanism is located upstream of the rolling mechanism and is used to unwind battery electrodes; The slitting mechanism is located downstream of the first thickness measuring mechanism and the first temperature measuring mechanism, and is used to slit the battery electrode into multiple electrode sheets. Multiple winding mechanisms are located downstream of the slitting mechanism and are used to wind up multiple of the electrode sheets.

33. A method for controlling the processing of battery electrode sheets, comprising: Roll-formed battery electrodes; Set the initial heating power setting and heat the rolled battery electrode sheets; Obtain the first temperature and first thickness of the heated battery electrode; The power adjustment amount is determined based on the first thickness and the first temperature; Based on the initial heating power setting and the power adjustment amount, the actual output heating power setting is adjusted.

34. The battery pole piece processing control method of claim 33, wherein, The step of determining the power adjustment amount based on the first thickness and the first temperature includes: The first power regulation amount is determined based on the target temperature of the battery electrode and the first temperature.

35. The battery pole piece processing control method of claim 34, wherein, The step of determining the power adjustment amount based on the first thickness and the first temperature further includes: The second power adjustment amount is determined based on the first thickness and the target thickness; The target temperature is adjusted based on the first thickness and the target thickness.

36. The battery electrode processing control method according to claim 35 further includes: The conveyor belt speed of the battery electrode is obtained, and a first power compensation amount is determined based on the conveyor belt speed. A second temperature is obtained inside the cavity of the oven, and a second power compensation amount is determined based on the second temperature, wherein a heating element for heating the battery electrode is disposed in the cavity; The step of adjusting the actual output heating power based on the initial heating power setting and the power adjustment amount includes: adjusting the actual output heating power setting based on the initial heating power setting, the power adjustment amount, the first power compensation amount, and the second power compensation amount.

37. The battery electrode processing control method according to any one of claims 33-36, further comprising: The initial ambient temperature inside the cavity of the oven is obtained, wherein a heating element for heating the battery electrode is disposed in the cavity; Compare the initial ambient temperature and the preheating temperature; When the initial ambient temperature is greater than or equal to the preheating temperature, the battery electrode sheets are rolled and heated.

38. A method for pre-rebound treatment of battery electrode thickness, comprising: The coated battery electrode sheet is rolled to achieve the first target thickness. The battery electrode sheet having the first target thickness is heated so that the thickness of the battery electrode sheet rebounds to the second target thickness; wherein the second target thickness is greater than or equal to the first target thickness.

39. The battery electrode thickness pre-rebound treatment method according to claim 38, wherein, In the step of rolling the coated battery electrode sheet, the temperature of the battery electrode sheet is 18℃-30℃; In the step of heating the battery electrode having the first target thickness, the temperature of the battery electrode after heating is 80°C-250°C.

40. The battery pole piece thickness pre-rebound process of claim 38 or 39, wherein, The ratio of the second target thickness to the first target thickness is 1.02-1.

1.

41. The battery pole piece thickness pre-rebound process of any of claims 38-40, wherein, The step of rolling the coated battery electrode sheets includes: Unwind the coated battery electrode sheets; The battery electrode is rolled at least once along the belt travel direction.

42. The battery pole piece thickness pre-rebound process of any of claims 38-41, wherein, The step of heating the battery electrode having the first target thickness, causing the thickness of the battery electrode to rebound to the second target thickness, includes: Set the initial heating power level and heat the battery electrode with the first target thickness; Obtain the thickness and first temperature of the heated battery electrode; The power adjustment amount is determined based on the thickness of the battery electrode and the first temperature; Based on the initial heating power setting and the power adjustment amount, the actual heating power setting is adjusted so that the thickness of the battery electrode sheet rebounds to the second target thickness.

43. The battery pole piece thickness pre-rebound process of claim 42, wherein, The step of determining the power adjustment amount based on the thickness of the battery electrode and the first temperature includes: The first power adjustment amount is determined based on the target temperature of the battery electrode and the first temperature; The second power adjustment amount is determined based on the thickness of the battery electrode and the second target thickness; The target temperature is adjusted according to the thickness of the battery electrode and the second target thickness.

44. The battery pole piece thickness pre-rebound process of claim 42 or 43, further comprising: The conveyor speed of the battery electrode is obtained, and a first power compensation amount is determined based on the conveyor speed; a second temperature is obtained inside the cavity of the oven, and a second power compensation amount is determined based on the second temperature, wherein a heating element for heating the battery electrode is disposed in the cavity; The step of adjusting the actual output heating power based on the initial heating power setting and the power adjustment amount to make the thickness of the battery electrode rebound to the second target thickness includes: adjusting the actual output heating power setting based on the initial heating power setting, the power adjustment amount, the first power compensation amount, and the second power compensation amount to make the thickness of the battery electrode rebound to the second target thickness.

45. The battery pole piece thickness pre-rebound process of any of claims 38-44, wherein, The battery electrode includes multiple active material coating areas along its width direction; The battery electrode thickness pre-rebound treatment method further includes: Along the carrying direction of the battery electrode sheet, the battery electrode sheet with a thickness rebounded to the second target thickness is cut according to the preset width of the active material coating area of ​​the battery cell to form multiple electrode sheets for making the battery cell.

Images