Pole piece diaphragm compounding device and method

Abstract

The invention relates to the technical field of pole piece manufacturing, in particular to a pole piece diaphragm compounding device and method.The pole piece diaphragm compounding device comprises a first diaphragm unwinding mechanism, a second diaphragm unwinding mechanism and a third diaphragm winding mechanism, the first diaphragm deviation correcting mechanism is used for correcting the deviation of the first diaphragm coiled material; the first diaphragm tension control mechanism is used for monitoring and controlling the tension of the first diaphragm coiled material; the pole piece unwinding mechanism is used for unwinding a pole piece coiled material; the pole piece deviation rectifying mechanism is used for performing deviation rectifying operation on the pole piece coiled material; the pole piece tension control mechanism is used for monitoring and controlling the tension of the pole piece coiled material; the thermal compounding mechanism is used for performing thermal compounding operation on the layered material to form a composite pole piece; and the winding mechanism is used for winding the composite pole piece. The composite pole piece has the effects of improving the consistency and reliability of the composite pole piece and improving the battery performance.

Description

Technical Field

[0001] The present invention relates to the technical field of pole piece manufacturing, and in particular to a pole piece and diaphragm composite device and method. Background Art

[0002] In the electrode manufacturing industry, the composite process of electrode and diaphragm is a key technical link that affects battery performance. Traditional diaphragms are mostly coated with a functional coating composed of a mixture of inorganic particles and adhesive polymers on the surface of a polyolefin substrate layer. However, the adhesion between traditional diaphragms and electrode is poor, resulting in low mechanical strength of the winding core. During subsequent processing and use, the electrode is prone to loosening and wrinkling, affecting the overall structural stability and performance of the battery.

[0003] In the existing technology, in order to solve the problems existing in traditional diaphragms, composite diaphragm technology came into being. The composite diaphragm is compounded with the diaphragm and the electrode through a compounding machine. This method can significantly improve the mechanical strength of the composite electrode and effectively solve the problems of loose and wrinkled electrode. At the same time, the interface after compounding is denser and more stable, which helps to reduce the occurrence of side reactions and improve the cycle stability of the battery. However, in the compounding process of the existing electrode diaphragm compounding machine, the electrode and the diaphragm are easily affected by tension fluctuations, resulting in tensile deformation and insufficient alignment accuracy, which in turn affects the subsequent electrode coating process. Therefore, how to design a electrode diaphragm compounding device that can improve the alignment accuracy of the electrode and the diaphragm and reduce the influence of tension fluctuations to improve the compounding quality and improve battery performance is a technical problem that needs to be urgently solved by enterprise technicians. Summary of the Invention

[0004] In a first aspect, in response to the above-mentioned deficiencies in the prior art, the present application provides a pole piece and diaphragm composite device.

[0005] The above-mentioned invention objectives of this application are achieved through the following technical solutions: a first diaphragm unwinding mechanism, which unwinds the first diaphragm coil; a first diaphragm deviation-correcting mechanism, which performs a deviation-correcting operation on the unwound first diaphragm coil; a first diaphragm tension control mechanism, which monitors and controls the tension of the unwound first diaphragm coil; The electrode unwinding mechanism unwinds the electrode coil; The electrode correction mechanism corrects the electrode coil after unwinding; The pole piece tension control mechanism monitors and controls the tension of the unwound pole piece coil; A thermal composite mechanism, which performs a thermal composite operation on the layered first diaphragm coil and the electrode coil to form a composite electrode; The winding mechanism is used to wind the composite electrode.

[0006] By adopting the above technical solution, during operation, the first diaphragm unwinding mechanism and the electrode unwinding mechanism release the diaphragm and electrode sheet coils respectively, the first diaphragm correction mechanism and the electrode sheet correction mechanism adjust the lateral position of the material in real time to ensure the accuracy of the running path, the first diaphragm tension control mechanism and the electrode sheet tension control mechanism avoid stretching and deformation of the material by adjusting the tension, the thermal composite mechanism applies temperature and pressure to the diaphragm coil and the electrode sheet coil to fuse their interfaces to form a composite electrode sheet, and finally the composite electrode sheet is rolled up by the winding mechanism for use in subsequent processes. Among them, the high-precision control combination of the pre-adjustment of the dual correction of the diaphragm and the electrode sheet and the closed-loop control of the tension control system to compensate for tension changes, as well as the interface optimization of the thermal composite process, systematically solves the problem of tension fluctuation in the traditional composite process, so as to improve the consistency and reliability of the composite electrode sheet and improve battery performance.

[0007] In a preferred example, the present application can be further configured as follows: the electrode diaphragm composite device further includes a layering guide mechanism, which guides and layers the unwound first diaphragm coil and the electrode sheet coil; An alignment detection mechanism is controlled and connected to the first diaphragm deviation correction mechanism and the pole piece deviation correction mechanism and is used to detect the vertical alignment of the first diaphragm coil and the pole piece coil after unwinding.

[0008] By adopting the above technical solution, the layered guiding mechanism guides the diaphragm and the electrode separately to form parallel paths, which is convenient for subsequent alignment. The alignment detection mechanism monitors the vertical alignment of the two in real time, and the detection data is fed back to the first diaphragm correction mechanism and the electrode correction mechanism to dynamically adjust the position deviation. The pre-adjustment of the dual correction of the diaphragm and the electrode and the tension control system compensate for the tension change to achieve closed-loop control. The combination of the three high-precision controls systematically solves the problems of tension fluctuation and alignment deviation in the traditional composite process, thereby significantly improving the consistency and reliability of the composite electrode and improving battery performance.

[0009] In a preferred example, the present application may be further configured as follows: the electrode diaphragm composite device further includes a second diaphragm unwinding mechanism, which unwinds the second diaphragm coil; A second diaphragm deviation correction mechanism, which corrects the deviation of the unwound second diaphragm coil; A second diaphragm tension control mechanism, which monitors and controls the tension of the unwound second diaphragm coil; The layered guiding mechanism is used to guide the first diaphragm coil, the electrode coil and the second diaphragm coil after unwinding and to layer them in the order of the first diaphragm coil, the electrode coil and the second diaphragm coil. The alignment detection mechanism is controlled and connected to the first diaphragm correcting mechanism, the second diaphragm correcting mechanism and the electrode correcting mechanism and is used to detect the vertical alignment of the first diaphragm coil, the second diaphragm coil and the electrode coil after unwinding.

[0010] By adopting the above technical solution, the pole piece forms a double-sided composite structure, which is suitable for a double-sided composite process.

[0011] In a preferred example, the present application can be further configured as follows: a static elimination mechanism is provided between the first diaphragm unwinding mechanism and the layered guide mechanism, and between the second diaphragm unwinding mechanism and the layered guide mechanism.

[0012] By adopting the above technical solution, the accumulation of static charge on the surface of the diaphragm can be eliminated from the source, ensuring that the diaphragm material is in a low-static state before compounding, eliminating the risk of local adhesion between the electrode and the diaphragm due to static electricity, and improving the cleanliness of the diaphragm surface and the interface quality.

[0013] In a preferred example, the present application can be further configured as follows: a defect detection mechanism is provided between the winding mechanism and the thermal composite mechanism, and the defect detection mechanism is used to detect the surface quality of the composite electrode.

[0014] By adopting the above technical solution, a defect detection mechanism is set up to facilitate real-time online monitoring of surface defects of the composite electrode, and feedback is given to the front-end correction mechanism, tension control mechanism, etc. through closed-loop control to make process adjustments.

[0015] In a preferred example, the present application can be further configured as follows: the first diaphragm correction mechanism includes an electric slide rail and a position sensor, the conveying direction of the electric slide rail is consistent with the width direction of the first diaphragm, the first diaphragm unwinding mechanism is slidably connected to the electric slide rail, and the position sensor is used to monitor the position of the first diaphragm unwinding mechanism in real time and control the connection to the alignment detection mechanism.

[0016] By adopting the above technical solution, compared with the traditional deviation correction method of adjusting the path by changing the angle and position of the unwinding roller, which easily causes local tension fluctuations, the first diaphragm unwinding mechanism is translated as a whole by the electric slide rail, which can keep the diaphragm material path smooth and reduce tension fluctuations.

[0017] In a preferred example, the present application can be further configured as follows: the thermal composite mechanism includes a thermal composite mounting bracket, a first pre-pressing roller, a second pre-pressing roller, a solar driven roller and several planetary driven rollers, the first pre-pressing roller, the second pre-pressing roller, the solar driven roller and several planetary driven rollers are all provided with heating elements and are all rotated in sequence on the thermal composite mounting bracket, the first pre-pressing roller and the second pre-pressing roller are symmetrically arranged up and down, and several planetary driven rollers are arranged around the circumference of the solar driven roller, the thermal composite mounting bracket is installed with a first rotating drive member, a pre-pressing drive member and a corresponding number of planetary driven rollers are installed with a pressure drive member, the first rotating drive member is used to drive the solar driven roller to rotate, the pre-pressing drive member is used to drive the first pre-pressing roller or the second pre-pressing roller to move vertically, and the pressure drive member is used to drive the corresponding planetary driven roller to move radially along the solar driven roller.

[0018] By adopting the above technical solution, when the diaphragm and the pole piece are guided to the first pre-stressing roller and the second pre-stressing roller by the layered guiding mechanism, the first pre-stressing roller and the second pre-stressing roller move toward each other, preliminarily pressing the multi-layer material, squeezing out the air and forming an initial interface contact, and then the preliminarily composited pole piece enters the gap between the sun drive roller and each planetary driven roller, and each planetary driven roller applies pressure to the preliminarily composited pole piece one by one in the composite motion of revolution and passive rotation, and at the same time, the diaphragm and the pole piece are heated by the heating element to melt and form a high-strength interface bond, which can improve the uniformity and interface bonding force of the composite of the diaphragm and the pole piece, and adopts a structure in which the sun drive roller actively rotates and the planetary driven roller passively revolves, as well as the setting of the pre-stressing drive and the pressure drive to control the spacing between the first pre-stressing roller and the second pre-stressing roller and the spacing between each planetary driven roller and the sun drive roller, so as to realize dynamic pressure control of the composite pole piece.

[0019] In a preferred example, the present application can be further configured as follows: the first diaphragm tension control mechanism includes a tension control mounting bracket, a control system, a first tension sensor, a second tension sensor and a traction roller, the first tension sensor and the second tension sensor are both mounted on the tension control mounting bracket, the traction roller is rotatably arranged on the tension control mounting bracket, the first tension sensor is used to monitor in real time the tension of the first diaphragm between the traction roller and the thermal composite mechanism, the second tension sensor is used to monitor in real time the tension of the first diaphragm between the first diaphragm unwinding mechanism and the traction roller, the traction roller is connected to a second rotating drive member, the second rotating drive member is used to drive the traction roller to rotate, the control system is controlled and connected to the first tension sensor, the second tension sensor, the first rotating drive member and the second rotating drive member, the first tension sensor controls the linear speed of the solar drive roller through the control system and the first rotating drive member, the second tension sensor controls the linear speed of the traction roller through the control system and the second rotating drive member.

[0020] By adopting the above technical solution, under the closed-loop control between the first tension sensor, the control system and the first rotary drive member, and between the second tension sensor, the control system and the second rotary drive member, by dynamically adjusting the linear speed of the solar drive roller and the traction roller, the first diaphragm can achieve precise adjustment of the tension between the unwinding process and the compounding process, ensuring that the pole piece is always in the optimal tension range before compounding, avoiding wrinkling caused by tension fluctuations, and improving the uniformity of the pole piece compounding, thereby improving the performance of the battery.

[0021] In a preferred example, the present application can be further configured as follows: the layered guide mechanism includes a plurality of guide rollers and a guide mounting bracket, and the plurality of guide rollers are distributed in a stepped manner and are all rotatably connected to the guide mounting bracket.

[0022] By adopting the above technical solution, a number of guide rollers distributed in a stepped manner are provided to form a parallel layered structure of the first diaphragm, the pole piece and the second diaphragm in sequence.

[0023] In a second aspect, the present application provides a pole piece and diaphragm composite method, comprising the following steps: S1, diaphragm and electrode unwinding: the first diaphragm unwinding mechanism, the electrode unwinding mechanism and the second diaphragm unwinding mechanism are used to unwind the materials respectively; S2. Material correction: The first diaphragm correction mechanism, the pole piece correction mechanism and the second diaphragm correction mechanism are used to correct the material respectively; S3, tension control: the first diaphragm tension control mechanism, the pole piece tension control mechanism and the second diaphragm tension control mechanism are used to monitor and control the tension of the material respectively; S4, layering guidance: The layering guidance mechanism guides the unwound first diaphragm, pole piece, and second diaphragm, and layers them in the order of the first diaphragm, pole piece, and second diaphragm; S5. Alignment detection: An alignment detection mechanism is used to monitor the vertical alignment of the first diaphragm, the pole piece, and the second diaphragm along the conveying direction, and the detection results are fed back to the first diaphragm correction mechanism, the pole piece correction mechanism, and the second diaphragm correction mechanism; S6. Thermal composite operation: using a thermal composite mechanism to perform a thermal composite operation on the layered first diaphragm, the electrode piece, and the second diaphragm; S7. Composite electrode winding: Use a winding mechanism to wind up the composite electrode.

[0024] By adopting the above technical solution, through the high-precision control combination of pre-adjustment of dual correction of diaphragm and electrode, compensation of tension change by tension control system, closed-loop control of alignment detection mechanism, and interface optimization of thermal composite process, the problems of tension fluctuation and alignment deviation in traditional composite process are systematically solved, thereby significantly improving the consistency and reliability of composite electrode and enhancing battery performance.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. During operation, the first diaphragm unwinding mechanism and the electrode sheet unwinding mechanism release the diaphragm and electrode sheet coils respectively. The first diaphragm correction mechanism and the electrode sheet correction mechanism adjust the lateral position of the material in real time to ensure the accuracy of the running path. The first diaphragm tension control mechanism and the electrode sheet tension control mechanism avoid stretching and deformation of the material by adjusting the tension. The layered guide mechanism guides the diaphragm and the electrode sheet separately to form parallel paths for subsequent alignment. The alignment detection mechanism monitors the vertical alignment of the two in real time, and the detection data is fed back to the first diaphragm correction mechanism and the electrode sheet correction mechanism to dynamically adjust the position deviation. The thermal composite mechanism applies temperature and pressure to the diaphragm coil and the electrode sheet coil to fuse their interfaces to form a composite electrode sheet. Finally, the composite electrode sheet is rolled up by the winding mechanism for use in subsequent processes. Among them, through the combination of high-precision control of pre-adjustment of dual correction of diaphragm and electrode sheet, compensation of tension changes by the tension control system, and closed-loop control of the alignment detection mechanism, as well as interface optimization of the thermal composite process, the problems of tension fluctuation and alignment deviation in the traditional composite process are systematically solved, thereby significantly improving the consistency and reliability of the composite electrode sheet and improving battery performance.

[0026] 2. At the same time, by setting up the second diaphragm unwinding mechanism, the second diaphragm correction mechanism and the second diaphragm tension control mechanism, and matching the layered guide mechanism, the electrode can form a double-sided composite structure, which is suitable for the double-sided composite process.

[0027] 3. Compared with the traditional deviation correction method that adjusts the path by changing the angle and position of the unwinding roller, which easily causes local tension fluctuations, the overall translation of the first diaphragm unwinding mechanism by the electric slide rail can keep the diaphragm material path smooth and reduce tension fluctuations.

[0028] 4. When the diaphragm and the electrode are guided to the first pre-stressing roller and the second pre-stressing roller by the layered guiding mechanism, the first pre-stressing roller and the second pre-stressing roller move toward each other to preliminarily press the multi-layer materials, squeeze out the air and form an initial interface contact, and then the preliminarily composited electrode enters the gap between the sun drive roller and each planetary driven roller. In the composite motion of revolution and passive rotation, each planetary driven roller applies pressure to the preliminarily composited electrode one by one, and at the same time, the diaphragm and the electrode are heated by the heating element to melt and form a high-strength interface bond, which can improve the uniformity and interface bonding strength of the composite of the diaphragm and the electrode, and adopts a structure in which the sun drive roller actively rotates and the planetary driven roller passively revolves, as well as the setting of the pre-stressing drive and the pressure drive to control the spacing between the first pre-stressing roller and the second pre-stressing roller and the spacing between each planetary driven roller and the sun drive roller, so as to realize dynamic pressure control of the composite electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic structural diagram of the electrode-diaphragm composite device in this application; Figure 2It is a structural schematic diagram of the first diaphragm unwinding mechanism and the first diaphragm deviation correcting mechanism in this application; Figure 3 It is a flow chart of the electrode-diaphragm composite method in this application.

[0030] Figure numerals: 1. first diaphragm unwinding mechanism; 2. first diaphragm correction mechanism; 21. electric slide rail; 3. first diaphragm tension control mechanism; 31. first tension sensor; 32. second tension sensor; 33. traction roller; 4. pole piece unwinding mechanism; 5. pole piece correction mechanism; 6. pole piece tension control mechanism; 7. layered guide mechanism; 8. alignment detection mechanism; 9. thermal composite mechanism; 91. first pre-pressing roller; 92. second pre-pressing roller; 93. solar drive roller; 94. planetary driven roller; 10. winding mechanism; 11. first diaphragm coil; 12. pole piece coil; 13. second diaphragm unwinding mechanism; 14. second diaphragm correction mechanism; 15. second diaphragm tension control mechanism; 16. second diaphragm coil; 17. static electricity removal mechanism; 18. defect detection mechanism. DETAILED DESCRIPTION

[0031] The following description of exemplary embodiments of the present application is made in conjunction with the accompanying drawings, including various details of the embodiments of the present application to facilitate understanding. These details should be considered as merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present application. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0032] It should be noted that the terms "first," "second," and the like in the present invention are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than that illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure.

[0033] In this document, the term "and / or" simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document, unless otherwise specified, generally indicates an "or" relationship between the related objects.

[0034] Please refer to the following Figure 1 To the attached Figure 3 The present invention describes a pole piece and diaphragm composite device and method.

[0035] like Figure 1 and Figure 2 As shown, a pole piece diaphragm composite device includes a first diaphragm unwinding mechanism 1, a first diaphragm deflection correction mechanism 2, a first diaphragm tension control mechanism 3, a pole piece unwinding mechanism 4, a pole piece deflection correction mechanism 5, a pole piece tension control mechanism 6, a thermal composite mechanism 9 and a winding mechanism 10, wherein the first diaphragm unwinding mechanism 1 unwinds the first diaphragm coil 11, the first diaphragm deflection correction mechanism 2 performs a deflection correction operation on the unwound first diaphragm coil 11, the first diaphragm tension control mechanism 3 monitors and controls the tension of the unwound first diaphragm coil 11, the pole piece unwinding mechanism 4 unwinds the pole piece coil 12, the pole piece deflection correction mechanism 5 performs a deflection correction operation on the unwound pole piece coil 12, the pole piece tension control mechanism 6 monitors and controls the tension of the unwound pole piece coil 12, the thermal composite mechanism 9 performs a thermal composite operation on the layered first diaphragm coil 11 and the pole piece coil 12 to form a composite pole piece, and the winding mechanism 10 is used to wind the composite pole piece; Specifically, during operation, the first diaphragm unwinding mechanism 1 and the electrode unwinding mechanism 4 release the diaphragm and electrode sheet coil 12 respectively, the first diaphragm correction mechanism 2 and the electrode sheet correction mechanism 5 adjust the lateral position of the material in real time to ensure the accuracy of the running path, the first diaphragm tension control mechanism 3 and the electrode sheet tension control mechanism 6 avoid stretching and deformation of the material by adjusting the tension, the thermal composite mechanism 9 applies temperature and pressure to the diaphragm coil and the electrode sheet coil 12 to fuse their interfaces to form a composite electrode, and finally the composite electrode is rolled up by the winding mechanism 10 for use in subsequent processes. Among them, the high-precision control combination of the pre-adjustment of the dual correction of the diaphragm and the electrode sheet and the closed-loop control of the tension control system to compensate for the tension change, as well as the interface optimization of the thermal composite process, systematically solves the problem of tension fluctuation in the traditional composite process, so as to improve the consistency and reliability of the composite electrode and improve the battery performance.

[0036] It should be noted that the first diaphragm unwinding mechanism 1 , the electrode unwinding mechanism 4 and the winding mechanism 10 can all adopt conventional coil unwinding equipment on the market to complete the winding and unwinding process of the diaphragm or electrode coil 12 .

[0037] Furthermore, the electrode-diaphragm composite device also includes a layered guiding mechanism 7 and an alignment detection mechanism 8. The layered guiding mechanism 7 is used to guide and layer the first diaphragm coil 11 and the electrode coil 12 after unwinding, and the alignment detection mechanism 8 is used to detect the vertical alignment of the first diaphragm coil 11 and the electrode coil 12 after unwinding. The layered guiding mechanism 7 guides the diaphragm and the electrode separately to form parallel paths for subsequent alignment. The alignment detection mechanism 8 monitors the vertical alignment of the two in real time, and the detection data is fed back to the first diaphragm correction mechanism 2 and the electrode correction mechanism 5 to dynamically adjust the position deviation, so as to combine the pre-adjustment of the dual correction of the diaphragm and the electrode, and the tension control system to compensate for the tension change, to achieve closed-loop control. The three high-precision control combinations are combined to systematically solve the problems of tension fluctuation and alignment deviation in the traditional composite process, thereby significantly improving the consistency and reliability of the composite electrode and improving battery performance.

[0038] For the case of double-sided diaphragm composite, in one embodiment, the electrode diaphragm composite device further includes a second diaphragm unwinding mechanism 13, a second diaphragm correction mechanism 14 and a second diaphragm tension control mechanism 15. The second diaphragm unwinding mechanism 13 unwinds the second diaphragm coil 16, and the second diaphragm correction mechanism 14 corrects the unwound second diaphragm coil 16. The second diaphragm tension control mechanism 15 monitors and controls the tension of the unwound second diaphragm coil 16. The layered guide mechanism 7 is used to unwind the second diaphragm coil 16. The first diaphragm coil 11, the electrode coil 12 and the second diaphragm coil 16 are guided and layered in the order of the first diaphragm coil 11, the electrode coil 12 and the second diaphragm coil 16, and the alignment detection mechanism 8 is controlled and connected to the first diaphragm correction mechanism 2, the second diaphragm correction mechanism 14 and the electrode correction mechanism 5 and is used to detect the vertical alignment of the first diaphragm coil 11, the second diaphragm coil 16 and the electrode coil 12 after unwinding, so that the electrode forms a double-sided composite structure, which is suitable for the double-sided composite process.

[0039] Preferably, a static removal mechanism 17 is provided between the first diaphragm unwinding mechanism 1 and the layered guide mechanism 7, and between the second diaphragm unwinding mechanism 13 and the layered guide mechanism 7. By providing the static removal mechanism 17, the static charge accumulation on the diaphragm surface can be eliminated from the source, ensuring that the diaphragm material is in a low static state before compounding, eliminating the risk of local adhesion between the electrode and the diaphragm due to static electricity, and improving the cleanliness of the diaphragm surface and the interface quality.

[0040] It should be noted that the static electricity removal mechanism 17 can adopt equipment such as an ion blower or a static electricity removal brush to generate positive and negative ions by ionizing the air, thereby neutralizing the static charge on the surface of the diaphragm to reduce the accumulation of static charge. Specifically, by installing the ion blower on the upper and lower sides of the unwinding path of the diaphragm material, a uniform ion field is formed to cover the entire width of the diaphragm material, so as to completely eliminate the static charge accumulation of the diaphragm material.

[0041] Preferably, a defect detection mechanism 18 is provided between the winding mechanism 10 and the thermal composite mechanism 9. The defect detection mechanism 18 is used to detect the surface quality of the composite electrode. By providing the defect detection mechanism 18, the surface defects of the composite electrode can be monitored online in real time, and the closed-loop control is used to feed back to the front-end correction mechanism, tension control mechanism, etc. for process adjustment.

[0042] It should be noted that the above-mentioned alignment detection mechanism 8 and defect detection mechanism 18 can both use high-precision linear array CCD cameras or laser scanning to cover and image the surface of the diaphragm, electrode or composite electrode. The alignment detection mechanism 8 uses covering imaging to identify the vertical alignment degree, and the defect detection mechanism 18 uses covering molding to identify defects such as debonding and wrinkles. The structure and working principle of the CCD camera or laser scanning are common knowledge to those skilled in the art and will not be elaborated here.

[0043] Preferably, the first diaphragm correction mechanism 2 includes an electric slide rail 21 and a position sensor (not shown in the figure). The conveying direction of the electric slide rail 21 is consistent with the width direction of the first diaphragm. The first diaphragm unwinding mechanism 1 is slidably connected to the electric slide rail 21. The position sensor is used to monitor the position of the first diaphragm unwinding mechanism 1 in real time and control the connection to the alignment detection mechanism 8. Compared with the traditional correction by changing the angle and position of the unwinding roller to adjust the path, it is easy to cause local tension fluctuations. By translating the first diaphragm unwinding mechanism 1 as a whole by the electric slide rail 21, the diaphragm material path can be kept smooth and the tension fluctuations can be reduced. Among them, the position sensor can adopt a grating scale displacement sensor, an infrared displacement sensor, etc., which can be used as an instrument for linear displacement detection, and there is no restriction here.

[0044] It should be noted that the structures and working principles of the above-mentioned pole piece correction mechanism 5 and the second diaphragm correction mechanism 14 are the same as those of the first diaphragm correction mechanism 2, and are not described in detail here.

[0045] In addition, the hot composite mechanism 9 includes a hot composite mounting bracket (not shown in the figure), a first pre-pressing roller 91, a second pre-pressing roller 92, a sun-driven roller 93 and a plurality of planetary driven rollers 94. The first pre-pressing roller 91, the second pre-pressing roller 92, the sun-driven roller 93 and the plurality of planetary driven rollers 94 are all provided with heating elements (not shown in the figure) and are all rotated in sequence on the hot composite mounting bracket. The first pre-pressing roller 91 and the second pre-pressing roller 92 are symmetrically arranged up and down, and the plurality of planetary driven rollers 94 are arranged around the circumference of the sun-driven roller 93. The hot composite mounting bracket is equipped with a first rotation drive (not shown in the figure), a pre-pressing drive (not shown in the figure) and a pressure drive (not shown in the figure) corresponding to the number of planetary driven rollers 94. The first rotation drive is used to drive the sun-driven roller 93 to rotate, the pre-pressing drive is used to drive the first pre-pressing roller 91 or the second pre-pressing roller 92 to move vertically, and the pressure drive is used to drive the corresponding planetary driven roller 94 to move radially along the sun-driven roller 93. , wherein, when the diaphragm and the electrode are guided to the first pre-pressing roller 91 and the second pre-pressing roller 92 by the layered guide mechanism 7, the first pre-pressing roller 91 and the second pre-pressing roller 92 move toward each other, preliminarily pressing the multilayer materials, squeezing out the air and forming an initial interface contact, and then the preliminarily composited electrode enters the gap between the sun drive roller 93 and each planetary driven roller 94. Each planetary driven roller 94 applies pressure to the preliminarily composited electrode one by one in the composite motion of revolution and passive rotation, and at the same time, the diaphragm and the electrode are heated by the heating element to melt and form a high-strength interface bond, which can improve the uniformity and interface bonding force of the composite of the diaphragm and the electrode, and adopts a structure in which the sun drive roller 93 actively rotates and the planetary driven roller 94 passively revolves, as well as the setting of the pre-pressing drive and the pressure drive to control the spacing between the first pre-pressing roller 91 and the second pre-pressing roller 92 and the spacing between each planetary driven roller 94 and the sun drive roller 93, so as to realize dynamic pressure control of the composite electrode.

[0046] It should be noted that the heating element can be a conventional liquid bath heating or electric heating device on the market that can heat the roller surface, and there is no limitation here.

[0047] Preferably, the first diaphragm tension control mechanism 3 includes a tension control mounting bracket (not shown in the figure), a control system, a first tension sensor 31, a second tension sensor 32 and a pulling roller 33. The first tension sensor 31 and the second tension sensor 32 are both installed on the tension control mounting bracket, and the pulling roller 33 is rotatably set on the tension control mounting bracket. The first tension sensor 31 is used to monitor the tension of the first diaphragm between the pulling roller 33 and the heat composite mechanism 9 in real time, and the second tension sensor 32 is used to monitor the tension of the first diaphragm between the first diaphragm unwinding mechanism 1 and the pulling roller 33 in real time. The pulling roller 33 is connected to a second rotary drive member, and the second rotary drive member is used to drive the pulling roller 33 to rotate. The control system controls the first tension sensor 31, the second tension sensor 32, the first rotary drive member and the second rotary drive member. The first tension sensor 31 controls the linear speed of the solar drive roller 93 through the control system and the first rotation drive member, and the second tension sensor 32 controls the linear speed of the traction roller 33 through the control system and the second rotation drive member. Under the closed-loop control between the first tension sensor 31, the control system and the first rotation drive member, and between the second tension sensor 32, the control system and the second rotation drive member, by dynamically adjusting the linear speeds of the solar drive roller 93 and the traction roller 33, the first diaphragm can achieve precise adjustment of the tension between the unwinding process and the compounding process, ensuring that the pole piece is always in the optimal tension range before compounding, avoiding wrinkling caused by tension fluctuations, and improving the uniformity of the pole piece compounding, thereby improving the performance of the battery.

[0048] It should be noted that the structures and working principles of the pole piece tension control mechanism 6 and the second diaphragm tension control mechanism 15 are the same as those of the first diaphragm tension control mechanism 3 , and are not described in detail here.

[0049] It should also be noted that the above-mentioned first rotating drive member and the second rotating drive member can both adopt servo motors to directly drive the rotation of the solar drive roller 93 and the traction roller 33, and the pre-load drive member and the pressure drive member can both adopt cylinders, electric cylinders or screw motors and other drivers that can achieve linear movement to directly drive the rollers to move, and the first tension sensor 31 and the second tension sensor 32 can both adopt conventional models on the market, such as BFZL-CZ, BFZL-ZT, etc.

[0050] In addition, the layered guide mechanism 7 includes a plurality of guide rollers and a guide mounting bracket (not shown in the figure). The plurality of guide rollers are distributed in a stepped manner and are all rotatably connected to the guide mounting bracket. By setting a plurality of guide rollers distributed in a stepped manner, a parallel layered structure of the first diaphragm, the pole piece and the second diaphragm can be formed in sequence.

[0051] Second, as Figure 3 As shown, the present invention provides a pole piece and diaphragm composite method, comprising the following steps: S1, diaphragm and electrode unwinding: the first diaphragm unwinding mechanism 1, the electrode unwinding mechanism 4 and the second diaphragm unwinding mechanism 13 are used to unwind the materials respectively; S2, material correction: the first diaphragm correction mechanism 2, the pole piece correction mechanism 5 and the second diaphragm correction mechanism 14 are used to correct the material respectively; S3, tension control: the first diaphragm tension control mechanism 3, the pole piece tension control mechanism 6 and the second diaphragm tension control mechanism 15 are used to monitor and control the tension of the material respectively; S4, layering guidance: the layering guidance mechanism 7 guides the unwound first diaphragm, pole piece and second diaphragm, and layers them in the order of the first diaphragm, pole piece and second diaphragm; S5, alignment detection: the alignment detection mechanism 8 is used to monitor the vertical alignment of the first diaphragm, the pole piece and the second diaphragm along the conveying direction, and the detection results are fed back to the first diaphragm correction mechanism 2, the pole piece correction mechanism 5 and the second diaphragm correction mechanism 14; S6, thermal composite operation: using the thermal composite mechanism 9 to perform thermal composite operation on the first diaphragm, the electrode and the second diaphragm after delamination; S7, composite electrode sheet winding: the composite electrode sheet is wound using the winding mechanism 10.

[0052] During the entire composite process, the problems of tension fluctuation and alignment deviation in traditional composite processes are systematically solved through the combination of high-precision control of pre-adjustment of dual deviation correction of diaphragm and electrode, compensation of tension change by tension control system, closed-loop control of alignment detection mechanism 8, and interface optimization of thermal composite process, thereby significantly improving the consistency and reliability of composite electrode and enhancing battery performance.

[0053] It should be noted that in order to improve the winding effect of the composite electrode, after completing the hot composite operation, a composite electrode tension control mechanism 6 and a composite electrode correction mechanism 5 can be added. The structure and working principle of the composite electrode tension control mechanism 6 can be the same as the above-mentioned first diaphragm tension control mechanism 3, and the structure and working principle of the composite electrode correction mechanism 5 can be the same as the above-mentioned first diaphragm correction mechanism 2.

[0054] The above specific embodiments do not constitute a limitation on the scope of protection of this application. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application shall be included within the scope of protection of this application.

Claims

1. A pole piece and diaphragm composite device, characterized in that: include: A first diaphragm unwinding mechanism (1) for unwinding a first diaphragm coil (11); A first diaphragm deviation correction mechanism (2) is configured to perform a deviation correction operation on the unwound first diaphragm coil (11); A first diaphragm tension control mechanism (3) monitors and controls the tension of the unwound first diaphragm coil (11); A pole piece unwinding mechanism (4) for unwinding the pole piece coil (12); A pole piece deviation correction mechanism (5) for performing a deviation correction operation on the unwound pole piece coil (12); A pole piece tension control mechanism (6) for monitoring and controlling the tension of the unwound pole piece coil (12); A thermal composite mechanism (9) performs a thermal composite operation on the layered first diaphragm coil (11) and the electrode coil (12) to form a composite electrode; A winding mechanism (10) is used for winding the composite pole piece.

2. The electrode-diaphragm composite device according to claim 1, characterized in that: Also includes: The electrode diaphragm composite device further comprises a layering guide mechanism (7) for guiding and layering the unwound first diaphragm coil (11) and the electrode coil (12); An alignment detection mechanism (8) is control-connected to the first diaphragm deviation correction mechanism (2) and the pole piece deviation correction mechanism (5) and is used to detect the vertical alignment of the unwound first diaphragm coil (11) and the pole piece coil (12).

3. The electrode-diaphragm composite device according to claim 2, characterized in that: Also includes: a second diaphragm unwinding mechanism (13) for unwinding the second diaphragm coil (16); a second diaphragm deviation correction mechanism (14) for performing a deviation correction operation on the unwound second diaphragm coil (16); A second diaphragm tension control mechanism (15) monitors and controls the tension of the unwound second diaphragm coil (16); The layering guide mechanism (7) is used to guide the unwound first diaphragm coil (11), the pole piece coil (12) and the second diaphragm coil (16) and to layer them in the order of the first diaphragm coil (11), the pole piece coil (12) and the second diaphragm coil (16); the alignment detection mechanism (8) is controlled and connected to the first diaphragm correction mechanism (2), the second diaphragm correction mechanism (14) and the pole piece correction mechanism (5) and is used to detect the vertical alignment of the unwound first diaphragm coil (11), the second diaphragm coil (16) and the pole piece coil (12).

4. The electrode-diaphragm composite device according to claim 3, characterized in that: A static elimination mechanism (17) is provided between the first diaphragm unwinding mechanism (1) and the layered guide mechanism (7), and between the second diaphragm unwinding mechanism (13) and the layered guide mechanism (7).

5. The electrode-diaphragm composite device according to claim 1, characterized in that: A defect detection mechanism (18) is provided between the winding mechanism (10) and the thermal composite mechanism (9), and the defect detection mechanism (18) is used to detect the surface quality of the composite electrode.

6. The electrode-diaphragm composite device according to claim 1, characterized in that: The first diaphragm deviation correction mechanism (2) comprises an electric slide rail (21) and a position sensor. The conveying direction of the electric slide rail (21) is consistent with the width direction of the first diaphragm. The first diaphragm unwinding mechanism (1) is slidably connected to the electric slide rail (21). The position sensor is used to monitor the position of the first diaphragm unwinding mechanism (1) in real time and control the connection to the alignment detection mechanism (8).

7. The electrode-diaphragm composite device according to claim 1, characterized in that: The thermal composite mechanism (9) comprises a thermal composite mounting bracket, a first pre-pressing roller (91), a second pre-pressing roller (92), a solar driven roller (93) and a plurality of planetary driven rollers (94); the first pre-pressing roller (91), the second pre-pressing roller (92), the solar driven roller (93) and the plurality of planetary driven rollers (94) are all provided with heating elements and are all arranged to rotate in sequence on the thermal composite mounting bracket; the first pre-pressing roller (91) and the second pre-pressing roller (92) are symmetrically arranged up and down; the plurality of planetary driven rollers (94) are arranged around the circumference direction of the solar driven roller (93); the thermal composite mounting bracket is provided with a first rotary drive member, a pre-pressing drive member and a pressure drive member corresponding to the number of the planetary driven rollers (94); the first rotary drive member is used to drive the solar driven roller (93) to rotate; the pre-pressing drive member is used to drive the first pre-pressing roller (91) or the second pre-pressing roller (92) to move vertically; and the pressure drive member is used to drive the corresponding planetary driven roller (94) to move radially along the solar driven roller (93).

8. The electrode-diaphragm composite device according to claim 7, characterized in that: The first diaphragm tension control mechanism (3) comprises a tension control mounting bracket, a control system, a first tension sensor (31), a second tension sensor (32) and a traction roller (33). The first tension sensor (31) and the second tension sensor (32) are both mounted on the tension control mounting bracket. The traction roller (33) is rotatably mounted on the tension control mounting bracket. The first tension sensor (31) is used to monitor the tension of the first diaphragm between the traction roller (33) and the thermal composite mechanism (9) in real time. The second tension sensor (32) is used to monitor the tension of the first diaphragm between the first diaphragm unwinding mechanism (1) and the traction roller (33) in real time. The traction roller (33) is connected to a second rotary drive member, and the second rotary drive member is used to drive the traction roller (33) to rotate. The control system is connected to the first tension sensor (31), the second tension sensor (32), the first rotary drive member and the second rotary drive member. The first tension sensor (31) controls the linear speed of the sun drive roller (93) through the control system and the first rotary drive member. The second tension sensor (32) controls the linear speed of the traction roller (33) through the control system and the second rotary drive member.

9. The electrode-diaphragm composite device according to claim 2, characterized in that: The layered guide mechanism (7) comprises a plurality of guide rollers and a guide mounting bracket. The plurality of guide rollers are distributed in a stepped manner and are all rotatably connected to the guide mounting bracket.

10. A method for assembling a pole piece and a diaphragm by using the pole piece and diaphragm assembly device according to claim 3, characterized in that: The following steps are involved: S1, diaphragm and electrode unwinding: using a first diaphragm unwinding mechanism (1), an electrode unwinding mechanism (4), and a second diaphragm unwinding mechanism (13) to unwind the materials respectively; S2, material deviation correction: using the first diaphragm deviation correction mechanism (2), the pole piece deviation correction mechanism (5) and the second diaphragm deviation correction mechanism (14) to perform deviation correction operations on the material respectively; S3, tension control: using the first diaphragm tension control mechanism (3), the pole piece tension control mechanism (6) and the second diaphragm tension control mechanism (15) to monitor and control the tension of the material respectively; S4, layering guidance: the layering guidance mechanism (7) guides the unwound first diaphragm, the pole piece and the second diaphragm, and layers them in the order of the first diaphragm, the pole piece and the second diaphragm; S5, alignment detection: using an alignment detection mechanism (8) to monitor the vertical alignment of the first diaphragm, the pole piece, and the second diaphragm along the conveying direction, and feeding back the detection results to the first diaphragm deviation correction mechanism (2), the pole piece deviation correction mechanism (5), and the second diaphragm deviation correction mechanism (14); S6, thermal composite operation: using a thermal composite mechanism (9) to perform a thermal composite operation on the first diaphragm, the electrode and the second diaphragm after layering; S7, composite electrode sheet rewinding: using a rewinding mechanism (10) to rewind the composite electrode sheet.

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