Separator thickness adjustment device and method, wound electrode assembly production system

Abstract

The application provides a kind of diaphragm thickness adjusting device (100) and method, winding electrode assembly production system, wherein, diaphragm thickness adjusting device (100) includes: mounting seat (1);Active roller (2) and passive roller (3), are rotatable around own axis and are arranged in parallel in mounting seat (1), active roller (2) and passive roller (3) form the gap for diaphragm (103) to pass through between, and passive roller (3) is adjustable relative to the position of active roller (2) to change the size of gap;First drive component (4) is configured as driving active roller (2) rotates around own axis to make diaphragm (103) move;And second drive component (5) is configured as driving passive roller (3) moves towards the direction close to or away from active roller (2), to change the pressure that active roller (2) and passive roller (3) exert on both sides of diaphragm (103) by adjusting the size of gap, to adjust thickness in the process of moving the diaphragm (103).

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a separator thickness adjustment device and method, and a winding electrode assembly production system. Background Technology

[0002] Lithium-ion batteries, due to their advantages such as high energy density, high power density, high cycle life, and long storage time, are widely used in electric vehicles.

[0003] The manufacturing process of lithium batteries includes multiple stages such as electrode fabrication, electrode assembly fabrication, and battery assembly. Among these, for wound electrode assemblies, the alignment of the tabs after winding is one of the important indicators for measuring the winding command. However, currently, for electrode assemblies with a large number of winding turns, the misalignment of the tabs is significant, and improving the alignment of the tabs remains a major challenge. Summary of the Invention

[0004] The purpose of this application is to effectively control the alignment of the tabs in a wound electrode assembly.

[0005] According to a first aspect of this application, a diaphragm thickness adjustment device is provided, comprising:

[0006] Mounting base;

[0007] Both the active roller and the passive roller are rotatable around their own axis and are arranged parallel to each other on the mounting base. A gap is formed between the active roller and the passive roller for the diaphragm to pass through, and the position of the passive roller relative to the active roller is adjustable to change the size of the gap.

[0008] A first drive component is configured to drive a drive roller to rotate about its own axis to move the diaphragm; and

[0009] The second drive unit is configured to drive the passive roller to move toward or away from the active roller in order to change the pressure applied to both sides of the diaphragm by the active and passive rollers by adjusting the gap size, thereby adjusting the thickness during the movement of the diaphragm.

[0010] This embodiment can drive the passive roller to move closer to or further away from the active roller via a second driving component, thereby adjusting the pressure applied to both sides of the diaphragm by the active and passive rollers by adjusting the gap size, thus adjusting the overall thickness of the diaphragm. Therefore, during the winding process to form the electrode assembly, the overall thickness of the diaphragm can be adjusted according to the amount of tab misalignment, reducing the misalignment of each tab and improving the alignment of each tab. Since the negative electrode sheet is subjected to expansion forces during production, causing fluctuations in its thickness, and the thickness and surface flatness of the positive and negative electrode sheets after coating with active materials and drying also fluctuate, and the winding force applied during the winding of the electrode assembly will also deviate, all of these factors can cause tab misalignment. By producing a diaphragm of a fixed thickness and then adjusting the thickness of the diaphragm, on-demand adjustment can be achieved.

[0011] Moreover, the diaphragm possesses good flexibility and extensibility, with a large adjustment range. It is not easily damaged or broken when adjusting the thickness, and has a uniform thickness after adjustment, which can improve the winding quality and yield of the electrode assembly. In addition, the diaphragm is driven by the power provided by the first driving component, allowing for thickness adjustment of the diaphragm throughout the entire extension direction. This enables online adjustment of the diaphragm thickness during the winding of the electrode assembly, thereby improving the production efficiency of the electrode assembly.

[0012] In some embodiments, the diaphragm thickness adjustment device further includes a distance detection component disposed on the mounting base and configured to detect the movement distance of the passive roller.

[0013] This embodiment determines the moving distance of the passive roller by using a distance detection component, which can accurately determine the position of the passive roller, thereby determining the size of the gap between the active roller and the passive roller, and thus determining the pressure applied to the diaphragm by the active roller and the passive roller, thereby controlling the amount of diaphragm thickness adjustment.

[0014] In some embodiments, the active roller and the passive roller are arranged facing each other on both sides of the diaphragm.

[0015] This embodiment applies pressure to the diaphragm by having the active and passive rollers positioned opposite each other. This allows the pressure to act perpendicularly on the diaphragm surface, creating positive pressure. This makes it easier to reduce the thickness of the diaphragm and also makes the diaphragm surface smoother and the thickness more uniform.

[0016] In some embodiments, the diaphragm thickness adjustment device further includes two guide members disposed at both ends of the passive roller and between the mounting base, configured to provide guidance for the movement of the passive roller.

[0017] This embodiment, by setting guide components at both ends of the passive roller, enables the passive roller to move closer to or further away from the active roller in a preset direction. This facilitates the determination of the passive roller's movement and its corresponding relationship with the gap between the passive roller and the active roller. Furthermore, it allows the passive roller to move more stably during the adjustment process, reducing swaying and controlling the size of the gap after adjustment, thereby improving the accuracy of diaphragm thickness adjustment.

[0018] In some embodiments, the guide component includes:

[0019] The first guide element is mounted on the mounting base; and

[0020] The second guide member is movably disposed relative to the first guide member along the adjustment direction of the passive roller;

[0021] The passive roller is rotatably mounted at its end to the second guide member, and the output end of the second drive member is connected to the second guide member.

[0022] This embodiment, by setting a first guide member and a second guide member that can move relative to each other along the adjustment direction of the passive roller, enables the second drive member to drive the passive roller to move by driving the second guide member. The structure is simple and it is easy to automatically adjust the position of the passive roller by the second drive member to achieve automatic adjustment of the diaphragm thickness.

[0023] In some embodiments, the diaphragm thickness adjustment device further includes a heating component configured to heat at least one of the active roller and the passive roller.

[0024] This embodiment heats at least one of the active and passive rollers by setting a heating element, which increases the temperature of the diaphragm during the process of the active and passive rollers applying pressure to the diaphragm. This makes the diaphragm easier to thin, reduces the amount of pressure applied by the active and passive rollers, flattens the dotted particles in the PCS layer to make the diaphragm thinner, and increases the thickness adjustment range of the diaphragm.

[0025] In some embodiments, the heating component includes:

[0026] A first heating element, disposed within the drive roller, is configured to heat the drive roller; and / or

[0027] The second heating element, located inside the passive roller, is configured to heat the passive roller.

[0028] In this embodiment, the first heating element is located inside the driving roller, and the second heating element is located inside the driven roller, eliminating the need for external space and allowing space for the diaphragm to pass through the driving and driven rollers. Furthermore, the heat generated can be conducted to the surfaces of the driving and driven rollers more quickly, improving the heating effect.

[0029] In some embodiments, the diaphragm thickness adjustment device further includes a controller configured to determine the adjustment amount of the passive roller and the heating temperature of the heating assembly based on the misalignment of the innermost and outermost tabs of the wound electrode assembly along the circumferential winding direction of the electrode assembly.

[0030] This embodiment can quantitatively determine the adjustment amount of the passive roller and the heating temperature of the heating component based on the misalignment of the tab in the circumferential direction of the electrode assembly winding, thereby improving the alignment of the tab.

[0031] In some embodiments, the diaphragm thickness adjustment device further includes a controller, wherein the controller is configured to move the passive roller away from the active roller and reduce the heating temperature of the heating assembly when the outermost tab is misaligned relative to the innermost tab in the winding direction of the wound electrode assembly; and / or the controller is configured to move the passive roller closer to the active roller and increase the heating temperature of the heating assembly when the outermost tab is misaligned relative to the innermost tab in the opposite winding direction of the wound electrode assembly.

[0032] This embodiment can determine the adjustment direction of the passive roller and the changing trend of the heating temperature of the heating component based on the misalignment direction of the outermost electrode tab relative to the innermost electrode tab, and can adjust the misalignment amount of the electrode tab in a targeted manner to align the electrode tabs.

[0033] In some embodiments, the mounting base includes:

[0034] Two fixed plates are spaced apart along the axis of the drive roller; and

[0035] Multiple support rods are connected between two fixed plates;

[0036] The active roller and the passive roller are located between two fixed plates. The two ends of the active roller are respectively mounted on the two fixed plates. The first drive component is mounted on the fixed plate. There are two second drive components, which are respectively mounted on the two fixed plates. The two ends of the passive roller are operably mounted on the output ends of the two second drive components.

[0037] The mounting base of this embodiment adopts a spliced ​​frame structure, which is simple in structure and has high strength and stability, making it easy to install various structural components and providing space for the diaphragm to pass through.

[0038] According to a second aspect of this application, a winding electrode assembly manufacturing system is provided, comprising:

[0039] An unwinding device is configured to release the wound diaphragm;

[0040] A winding device is configured to wind a first electrode, a second electrode, and a diaphragm to form an electrode assembly, wherein the first and second electrodes have opposite polarities; and

[0041] The diaphragm thickness adjustment device of the above embodiment is provided between the unwinding device and the winding device and is configured to adjust the thickness of the diaphragm released by the unwinding device.

[0042] According to a third aspect of this application, a method for adjusting diaphragm thickness is provided, comprising:

[0043] The diaphragm passes through the gap formed between the active roller and the passive roller, which are installed in parallel.

[0044] The passive roller is driven by the second drive component to move closer to or further away from the active roller, so as to change the pressure applied to both sides of the diaphragm by adjusting the gap size;

[0045] The first drive component drives the active roller to rotate around its own axis, so that the thickness of the diaphragm can be adjusted during the movement.

[0046] In some embodiments, the diaphragm thickness adjustment method further includes:

[0047] During the process of applying pressure to both sides of the diaphragm by the active roller and the passive roller, at least one of the active roller and the passive roller is heated by the heating assembly.

[0048] In some embodiments, the diaphragm thickness adjustment method further includes:

[0049] Based on the misalignment between the innermost and outermost tabs of the wound electrode assembly along the circumferential direction of the electrode assembly, the adjustment amount of the passive roller and the heating temperature of the heating assembly are determined.

[0050] In some embodiments, the step of determining the adjustment amount of the passive roller and the heating temperature of the heating assembly based on the misalignment amount between the innermost and outermost tabs of the wound electrode assembly along the circumferential direction of the electrode assembly includes:

[0051] When the outermost tab is misaligned relative to the innermost tab in the winding direction of the wound electrode assembly, the passive roller is moved away from the active roller, and the heating temperature of the heating assembly is reduced; and / or

[0052] When the outermost tab is misaligned relative to the innermost tab in the opposite direction of the winding of the wound electrode assembly, the passive roller moves toward the active roller and increases the heating temperature of the heating assembly. Attached Figure Description

[0053] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0054] Figure 1 This is a schematic diagram of the structure of some embodiments of a battery cell.

[0055] Figure 2 This is a schematic diagram of the end face structure of some embodiments of the wound electrode assembly in a battery cell.

[0056] Figure 3 This is a schematic diagram of the structure of some embodiments of the first electrode.

[0057] Figure 4 This is a schematic diagram of the structure of some embodiments of the second electrode.

[0058] Figure 5 This is a perspective view of some embodiments of a wound electrode assembly.

[0059] Figure 6 This is a front view of some embodiments of a wound electrode assembly.

[0060] Figure 7 This is a schematic diagram of the module composition of some embodiments of a wound electrode assembly production system.

[0061] Figure 8 This is a schematic diagram illustrating the principle of adjusting the thickness of the diaphragm using the diaphragm thickness adjustment device of this application.

[0062] Figure 9 This is a perspective view of some embodiments of the diaphragm thickness adjustment device of this application.

[0063] Figure 10 This is a front view of some embodiments of the diaphragm thickness adjustment device of this application.

[0064] Figure 11 This is a schematic diagram of the module composition of some embodiments of the diaphragm thickness adjustment device of this application.

[0065] Figure 12 This is a schematic diagram of a coiled electrode assembly experiencing tab misalignment.

[0066] Figure 13 The flowcharts are for some embodiments of the diaphragm thickness adjustment method of this application. Detailed Implementation

[0067] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0068] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0069] This application uses terms such as "upper," "lower," "top," "bottom," "front," "back," "inner," and "outer" to indicate orientation or positional relationships. This is only for the convenience of describing this application and is not intended to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the scope of protection of this application.

[0070] Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" does not mean strictly vertical, but rather within the permissible range of error. "Parallel" does not mean strictly parallel, but rather within the permissible range of error. The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application.

[0071] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" 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. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0072] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least some of the embodiments of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0073] The battery mentioned in the embodiments of this application refers to a single physical module comprising multiple battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack, etc.

[0074] Battery cells may include lithium-ion batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and this application embodiment is not limited to these. Battery cells may be cylindrical, flat, cuboid, or other shapes, etc., and this application embodiment is not limited to these. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and this application embodiment is not limited to these.

[0075] Current battery cells typically include a casing and an electrode assembly housed within the casing, with an electrolyte filled inside. The electrode assembly is mainly formed by stacking or winding a first electrode and a second electrode with opposite polarities, and usually an insulating component, such as a separator, is provided between the first and second electrodes. The portions of the first and second electrodes coated with active material constitute the main body of the electrode assembly, while the portions of the first and second electrodes not coated with active material constitute the first tab and the second tab, respectively. In lithium-ion batteries, the first electrode can be a positive electrode, including a positive current collector and positive active material layers disposed on both sides of the positive current collector. The material of the positive current collector can be, for example, aluminum, and the positive active material can be, for example, lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.; the second electrode can be a negative electrode, including a negative current collector and negative active material layers disposed on both sides of the negative current collector. The material of the negative current collector can be, for example, copper, and the negative active material can be, for example, graphite or silicon, etc. Optionally, the first electrode can also be a negative electrode, and correspondingly, the second electrode can be a positive electrode. The first and second tabs can be located together at one end of the main body or at opposite ends of the main body. During the charging and discharging process of the battery cell, the positive and negative active materials react with the electrolyte, and the tabs connect to the terminals to form a current loop.

[0076] To more clearly illustrate the improvement ideas of this application, the battery cell and the electrode assembly therein will first be described in detail.

[0077] In some embodiments, such as Figure 1 As shown, the battery cell 100' includes a housing 20, an electrode assembly 10, an end cap assembly 40, and two adapters 30. The housing 20 has an opening, and the end cap assembly 40 closes the opening and connects to the housing 20 to form the outer shell of the battery cell 100'. The electrode assembly 10 is disposed inside the housing 20, and the housing 20 is filled with electrolyte. Depending on the actual usage requirements, the electrode assembly 10 can be configured as one or more.

[0078] Figure 2This is a schematic diagram of the end structure of a wound electrode assembly. The electrode assembly 10 is formed by winding a first electrode 101 and a second electrode 102 with opposite polarities, and a diaphragm 103 is typically provided between the first electrode 101 and the second electrode 102. For example, the electrode assembly 10 is flat and has two parallel, oppositely arranged straight sections 10A and two oppositely arranged turning sections 10B, with the turning sections 10B connected to the same end of the two straight sections 10A. Optionally, the electrode assembly 10 may also be cylindrical.

[0079] like Figure 3 and Figure 4 As shown, both the first electrode 101 and the second electrode 102 include a current collector 1011. The current collector 1011 may include a main body portion 1011A and an electrode tab portion 1011B. The electrode tab portion 1011B protrudes outward from the end face of the main body portion 1011A along the width direction. A coating layer 1012 is provided on the side of the current collector 1011. The coating layer 1012 may be provided on both sides of the current collector 1011. For the innermost or outermost electrode, the coating layer 1012 may be provided only on one side of the current collector 1011.

[0080] Figure 3 This is a schematic diagram of the structure of some embodiments of the first electrode 101. For example, the first electrode 101 is a negative electrode. The current collector 1011 may be made of copper, and the coating layer 1012 is a negative electrode active material, which may be graphite or silicon, etc. The coating area of ​​the coating layer 1012 along the width direction of the first electrode 101 extends beyond the edge of the main body portion 1011A and covers the root of the tab portion 1011B.

[0081] Figure 4 This is a schematic diagram of the structure of the second electrode 102, for example, the second electrode 102 is a positive electrode. The current collector 1011 can be made of aluminum, and the coating layer 1012 may include an active material layer 1012A and an insulating layer 1012B arranged side by side along the width direction of the second electrode 102. The insulating layer 1012B is located along the width direction of the second electrode 102 on the side of the active material layer 1012A near the tab portion 1011B. The active material layer 1012A can be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. By setting the insulating layer 1012B and placing the end of the main body portion 1011A of the negative electrode near the tab portion 1011B in the width direction within the region where the insulating layer 1012B is located, the risk of a short circuit between the first electrode 101 and the second electrode 102 after metal shavings puncture the separator 103 can be reduced, while ensuring that the active material layer 1012A of the negative electrode extends beyond the active material layer 1012A of the adjacent positive electrode in the width direction.

[0082] Figure 5This is a schematic diagram of the structure of an electrode assembly 10 formed by winding a first electrode 101, a second electrode 102, and a diaphragm 103 along a winding axis K. The main body portion 1011A of each of the first and second electrode 102 forms an electrode body 10C after winding. Multiple tabs 1011B of the first electrode 101 are stacked to form tabs 10D, and multiple tabs 1011B of the second electrode 102 are also stacked to form tabs 10D. These two tabs 10D can be led out from the same end of the electrode body 10C along the winding axis K. Optionally, the tabs 10D can be led out from both ends of the electrode body 10C along the winding axis K.

[0083] Ideally, the multiple tabs 1011B in the tab 10D should be perfectly aligned in the winding direction, that is, all the tabs 1011B in the first tab 10D should be facing each other.

[0084] Winding is a crucial step in the production of electrode assembly 10, and the alignment of the tabs 10D (i.e., the alignment of multiple tab portions 1011B within the tab 10D) is one of the important indicators for measuring winding quality. For electrode assembly 10 with a large number of winding turns, controlling the misalignment of multiple tab portions 1011B within the tab 10D is a challenging aspect of the winding process.

[0085] The inventors discovered in practice that factors such as the thickness deviation and surface unevenness of the first electrode 101 and the second electrode 102, as well as the tightness of the winding, have a significant impact on the alignment of the tab 10D, and are difficult to control during the winding process. Figure 6 As shown, the misalignment of tab 10D is ΔX, which is the misalignment between the innermost tab portion 1011B and the outermost tab portion 1011B of the same tab 10D.

[0086] To address this, the inventors devised a method to compensate for the influence of dimensional errors and winding tightness on the alignment of the tab 10D by adjusting the thickness of the electrode itself. For example, the electrode thickness can be adjusted by applying pressure with rollers. Although this can improve the misalignment of the tab 10D to some extent, the effect is not ideal, and the alignment of the tab 10D still has some deviation.

[0087] In addition, due to the high brittleness of the electrodes in some batteries and the limited control over electrode thickness, the required error correction amount for 10D electrode misalignment cannot be achieved. Applying pressure with rollers can cause active material to detach from the electrodes, leading to lithium plating risks. Furthermore, some ternary lithium-ion batteries (e.g., those containing nickel, cobalt, and manganese) have high energy density, and this method would increase the lithium-ion transport distance, resulting in lithium plating and posing a safety risk. Moreover, due to safety risk control measures, some products cannot use rollers to apply pressure to the electrodes, resulting in ineffective control of 10D electrode misalignment.

[0088] Based on the aforementioned problems, the inventors considered that the diaphragm 103 is less brittle than the electrode sheet and has better flexibility and ductility. Therefore, it is possible to try to improve the misalignment of the tab 10D by adjusting the thickness of the diaphragm. Following this improvement idea, this application provides a diaphragm thickness adjustment device.

[0089] like Figure 7 As shown, this diaphragm adjustment device 100 can be used in a wound electrode assembly production system, including: an unwinding device 200, a diaphragm thickness adjustment device 100, and a winding device 300. The unwinding device 200 is configured to release a wound diaphragm 103; the winding device 300 is configured to wind a first electrode 101, a second electrode 102, and the diaphragm 103 to form an electrode assembly 10, wherein the first electrode 101 and the second electrode 102 have opposite polarities; the diaphragm thickness adjustment device 100 is disposed between the unwinding device 200 and the winding device 300, and is configured to adjust the thickness of the diaphragm 103 released by the unwinding device 200.

[0090] Among them, such as Figure 8 As shown, the diaphragm 103 released by the unwinding device 200 enters the winding device 300 after passing through the diaphragm thickness adjustment device 100. After receiving the first electrode 101, the second electrode 102, and the two diaphragms 103, the winding device 300 winds them onto the reel 301 with a preset tension. Depending on the adjustment requirements of the tab 10D misalignment, when the adjustment amount is small, only one unwinding device 200 can be equipped with a diaphragm adjustment device 100 to adjust the thickness of only one diaphragm 103; or when the adjustment amount is large, both unwinding devices 200 can be equipped with corresponding diaphragm adjustment devices 100 to selectively adjust the thickness of the two diaphragms 103, thereby increasing the adjustment range; or, if the adjustment range remains unchanged, the adjustment amount of each diaphragm adjustment device 100 can be reduced.

[0091] During the winding of the electrode assembly 10, the diaphragm 103 moves at a preset speed, and the power for the movement can come from the diaphragm adjustment device 100 or the winding device 300. The thickness of the diaphragm 103 can be adjusted in the entire extension direction by the movement of the diaphragm 103.

[0092] Optionally, in order to further increase the misalignment adjustment range of the tab 10D, an electrode thickness adjustment device can be added to at least one of the first electrode 101 and the second electrode 102. The structure of the electrode thickness adjustment device is consistent with the structure of the diaphragm adjustment device 100.

[0093] In this embodiment, during the winding process of forming the electrode assembly 10, the overall thickness of the diaphragm 103 can be adjusted according to the misalignment of the tabs 10D to reduce the misalignment of each tab portion 1011B in the tabs 10D, thereby improving the alignment of each tab portion 1011B in the tabs 10D. Furthermore, the diaphragm 103 has good flexibility and extensibility, a large adjustment range, and is not easily damaged or broken during thickness adjustment. After adjustment, it has a uniform thickness, which can improve the winding quality and yield of the electrode assembly 10. In addition, this method allows for online adjustment of the diaphragm 103 thickness during the winding process of the electrode assembly 10, thereby improving the production efficiency of the electrode assembly 10.

[0094] In some embodiments, such as Figures 9 to 11 As shown, a diaphragm thickness adjustment device 100 includes: a mounting base 1, an active roller 2, a passive roller 3, a first driving component 4, and a second driving component 5. The active roller 2 and the passive roller 3 are both rotatable about their own axes and are arranged parallel to each other on the mounting base 1. A gap is formed between the active roller 2 and the passive roller 3 for the diaphragm 103 to pass through, and the position of the passive roller 3 relative to the active roller 2 is adjustable to change the size of the gap. The first driving component 4 is configured to drive the active roller 2 to rotate about its own axis to move the diaphragm 103. The second driving component 5 is configured to drive the passive roller 3 to move towards or away from the active roller 2, thereby changing the pressure applied to both sides of the diaphragm 103 by adjusting the gap size, thus adjusting the thickness of the diaphragm 103 during its movement.

[0095] The mounting base 1 can be a frame structure to accommodate the drive roller 2 and the driven roller 3, and also facilitates the passage of the diaphragm 103. The drive roller 2 and the driven roller 3 can be cylindrical, with their axes parallel. After the diaphragm 103 passes through the gap, its two sides along the thickness direction contact the drive roller 2 and the driven roller 3 respectively. The first driving component 4 provides power for the rotation of the drive roller 2 around its own axis, thereby driving the diaphragm 103 to move. The movement of the diaphragm 103 further drives the driven roller 3 to rotate.

[0096] Optionally, the first drive component 4 can be mounted on the mounting base 1. The first drive component 4 can output rotational motion, and its output end is connected to one end of the drive roller 2. For example, the first drive component 4 may include a motor or a motor, etc. In order to make the diaphragm 103 run at a suitable speed to match the winding speed, the first drive component 4 may also include a reducer to change the output speed of the motor or motor, so that the drive roller 2 rotates at a preset speed.

[0097] The second drive component 5 provides power for the movement of the passive roller 3, driving it to move closer to or further away from the active roller 2. This allows for adjustment of the pressure applied to both sides of the diaphragm 103 by the active roller 2 and the passive roller 3 through adjusting the gap, thereby adjusting the thickness of the diaphragm 103. Optionally, the second drive component 5 can also be mounted on the mounting base 1, and it can output linear motion. To ensure a consistent gap throughout the entire length direction of the passive roller 3 during movement, two second drive components 5 can be provided, one for each end of the passive roller 3, ensuring a consistent thickness of the diaphragm 103 after adjustment in the width direction. For example, the second drive component 5 can be an electric actuator, a linear motor, a pneumatic cylinder, or a hydraulic cylinder. Electric actuators and linear motors can achieve servo control, providing high control precision and meeting the requirements for precise, minute-by-minute adjustment of the diaphragm 103 thickness.

[0098] Optionally, the separator 103 is formed by stacking layers, including: a base membrane, two CCS layers (CCS stands for "Ceramics coated separator"), and a PCS layer (PCS stands for "PVDF coated separator"), where PVDF is an abbreviation for Polyvinylidene fluoride. The two CCS layers are respectively disposed on both sides of the base membrane, and the PCS layer is disposed on the outer side of the CCS layers. The PCS layer can be disposed on the outer side of both CCS layers, or it can be disposed on the outer side of only one CCS layer. The PCS layer contains numerous particles distributed in a dotted pattern. During the application of pressure to the separator 103, the particles are flattened, causing the PCS layer to thin, thereby adjusting the thickness of the separator 103.

[0099] This embodiment can drive the passive roller 3 to move closer to or further away from the active roller 2 via the second driving component 5, thereby adjusting the pressure applied to both sides of the diaphragm 103 by the active roller 2 and the passive roller 3 by adjusting the gap size, thus adjusting the overall thickness of the diaphragm 103. Therefore, during the winding process to form the electrode assembly 10, the overall thickness of the diaphragm 103 can be adjusted according to the misalignment of the tabs 10D, reducing the misalignment of each tab portion 1011B in the tabs 10D and improving the alignment of each tab portion 1011B in the tabs 10D. Since the negative electrode sheet is subjected to expansion force during production, causing fluctuations in its thickness, and the thickness and surface flatness of the positive and negative electrode sheets after coating with active materials and drying also fluctuate, the winding force applied during the winding of the electrode assembly 10 will also deviate. All of these factors can cause misalignment of the tabs 10D. By producing a diaphragm 103 of fixed thickness and then adjusting the thickness of the diaphragm 103, on-demand adjustment can be achieved.

[0100] Furthermore, the diaphragm 103 possesses good flexibility and extensibility, with a large adjustment range. It is not easily damaged or broken when adjusting the thickness, and has a uniform thickness after adjustment, which can improve the winding quality and yield of the electrode assembly 10. In addition, the diaphragm 103 is driven by the power provided by the first driving component 4, allowing the thickness of the diaphragm 103 to be adjusted along the entire extension direction. This enables online adjustment of the thickness of the diaphragm 103 during the winding process of the electrode assembly 10, thereby improving the production efficiency of the electrode assembly 10.

[0101] In some embodiments, the diaphragm thickness adjustment device 100 may further include a distance detection component 6 disposed on the mounting base 1 and configured to detect the movement distance of the passive roller 3.

[0102] For example, the distance detection component 6 can be an optical distance sensor, an infrared distance sensor, or an ultrasonic distance sensor. The distance detection component 6 can determine the moving distance of the passive roller 3 by detecting its distance from the surface of the passive roller 3. For example, the distance detection component 6 can be located on the moving path of the passive roller 3 to more easily and accurately obtain the pressure between the driving roller 2 and the passive roller 3.

[0103] This embodiment determines the moving distance of the passive roller 3 by using the distance detection component 6, which can accurately determine the position of the passive roller 3, thereby determining the size of the gap between the active roller 2 and the passive roller 3, and thus obtaining the pressure applied to the diaphragm 103 by the active roller 2 and the passive roller 3, thereby controlling the thickness adjustment amount of the diaphragm 103.

[0104] In some embodiments, the active roller 2 and the passive roller 3 are arranged facing each other on both sides of the diaphragm 103.

[0105] "Directly facing each other" means that the active roller 2 and the passive roller 3 are directly facing each other in the thickness direction of the diaphragm 103, that is, the plane formed by the axes of the active roller 2 and the passive roller 3 is parallel to the thickness direction of the diaphragm 103.

[0106] In this embodiment, the active roller 2 and the passive roller 3 are positioned opposite each other to apply pressure to the thickness direction of the diaphragm 103. This allows the pressure to act perpendicularly on the surface of the diaphragm 103, forming positive pressure. This makes it easier to reduce the thickness of the diaphragm 103 and also makes the surface of the diaphragm 103 smoother and the thickness more uniform.

[0107] In some embodiments, such as Figure 9 As shown, the diaphragm thickness adjustment device 100 may further include two guide components 8, which are respectively disposed between the two ends of the passive roller 3 and the mounting base 1, and are configured to provide guidance for the movement of the passive roller 3.

[0108] This embodiment, by providing guide components 8 at both ends of the passive roller 3, enables the passive roller 3 to move closer to or further away from the active roller 3 in a preset direction. This facilitates the determination of the movement amount of the passive roller 3 and its corresponding relationship with the gap between it and the active roller 2. Furthermore, it allows the passive roller 3 to move more stably during the adjustment process, reducing swaying and controlling the size of the gap after adjustment, thereby improving the accuracy of the thickness adjustment of the diaphragm 103.

[0109] In some embodiments, such as Figure 9 As shown, the guide component 8 includes: a first guide 81 disposed on the mounting base 1; and a second guide 82 disposed movably relative to the first guide 81 along the adjustment direction of the passive roller 3; wherein the end of the passive roller 3 is rotatably mounted on the second guide 82, and the output end of the second drive component 5 is connected to the second guide 82.

[0110] For example, the first guide member 81 is provided with a guide groove 811, which extends along the adjustment direction of the passive roller 3. The second guide member 82 includes a base plate 821 and a protrusion 822. The protrusion 822 is connected to the base plate 821, embedded in the guide groove 811, and movable along the guide groove 811. The base plate 821 is supported on the first guide member 81. The end of the passive roller 3 is connected to the protrusion 822, and the passive roller 3 is rotatably connected relative to the protrusion 822. For example, the end of the passive roller 3 is rotatably mounted to the protrusion 822 via a bearing, or the passive roller 3 includes a shaft and a sleeve. The end of the shaft is fixedly mounted to the protrusion 822, and the sleeve is rotatably sleeved outside the shaft. Optionally, the first guide member 81 and the second guide member 82 adopt opposite structures.

[0111] This embodiment, by setting a first guide member 81 and a second guide member 82 that can move relative to each other along the adjustment direction of the passive roller 3, enables the second drive member 5 to drive the passive roller 3 to move by driving the second guide member 82. The structure is simple and it is easy to automatically adjust the position of the passive roller 3 by the second drive member 5 to achieve automatic adjustment of the thickness of the diaphragm 103.

[0112] In some embodiments, the diaphragm thickness adjustment device 100 may further include a heating component 7 configured to heat at least one of the active roller 2 and the passive roller 3.

[0113] For example, the driving roller 2 and the passive roller 3 can be heated together by the heating assembly 7, or the heating assembly 7 can include two independent heating components to heat the driving roller 2 and the passive roller 3 separately, making it easy to adjust the heating temperature of the driving roller 2 and the passive roller 3 as needed. For example, the heating assembly 7 can be electromagnetic heating, electric heating wire heating, infrared heating element, or the heating assembly 7 can also be a liquid guide pipe provided in the driving roller 2 and the passive roller 3 for introducing a high-temperature gas or liquid medium for heating.

[0114] This embodiment heats at least one of the active roller 2 and passive roller 3 by setting a heating component 7. This increases the temperature of the diaphragm 103 during the process of the active roller 2 and passive roller 3 applying pressure to the diaphragm 103, making it easier to thin the diaphragm 103. It also reduces the amount of pressure applied by the active roller 2 and passive roller 3, causing the dotted particles in the PCS layer to be flattened to reduce the thickness of the diaphragm 103, thereby increasing the thickness adjustment range of the diaphragm 103.

[0115] In some embodiments, such as Figure 10 As shown, the heating assembly 7 includes: a first heating element 71 disposed in the drive roller 2 and configured to heat the drive roller 2; and / or a second heating element 72 disposed in the passive roller 3 and configured to heat the passive roller 3.

[0116] The first heating component 71 can be arranged along the entire length of the active roller 2, and the second heating component 72 can also be arranged along the entire length of the passive roller 3. This allows the active roller 2 and the passive roller 3 to be heated evenly along the entire length, thereby making the diaphragm 103 heated evenly along the entire width and improving the uniformity of the thickness adjustment of the diaphragm 103.

[0117] Optionally, the heating temperatures of the first heating element 71 and the second heating element 72 can be controlled in conjunction to ensure that the active roller 2 and the passive roller 3 reach the same temperature, thereby ensuring uniform pressure on both sides of the diaphragm 103 and reducing deformation of the diaphragm 103 during the heating process. This is suitable for diaphragms 103 where PCS layers are provided on the outer sides of both CCS layers. Alternatively, the heating temperatures of the first heating element 71 and the second heating element 72 can be controlled independently. For example, the two heating elements can be set to different temperatures, or only one heating element can be turned on. This is suitable for diaphragms 103 where only one CCS layer has a PCS layer on the outer side.

[0118] In this embodiment, the first heating element 71 is located inside the driving roller 2, and the second heating element 72 is located inside the driven roller 3. This eliminates the need for external space and allows space for the diaphragm 103 to pass through the driving roller 2 and the driven roller 3. Furthermore, the heat generated can be conducted to the surfaces of the driving roller 2 and the driven roller 3 more quickly, improving the heating effect.

[0119] In some embodiments, such as Figure 11 As shown, the diaphragm thickness adjustment device 100 may further include a controller 9, which is configured to determine the adjustment amount of the passive roller 3 and the heating temperature of the heating component 7 based on the misalignment amount between the innermost electrode tab 1011B and the outermost electrode tab 1011B along the winding circumference of the electrode assembly 10.

[0120] The misalignment amount ΔX can be measured from the wound electrode assembly 10. ΔX includes the misalignment direction and size of the outermost tab 1011B relative to the innermost tab 1011B along the winding circumferential direction. Based on the correspondence between the misalignment amount ΔX and the required thickness Δt of the diaphragm 103, the required thickness Δt of the diaphragm 103 to be reduced from its initial thickness can be determined. Then, based on Δt, the adjustment amount Δs of the passive roller 3 moving towards the active roller 2 and the required heating temperature T of the active roller 2 and / or the passive roller 3 can be determined. The correspondence between Δt, Δs, and T can be obtained in advance through experiments.

[0121] Optionally, before winding, after determining the adjustment amount of the passive roller 3 and the heating temperature of the heating component 7 based on the misalignment amount ΔX, the passive roller 3 is adjusted to the required position, and the active roller 2 and / or the passive roller 3 are heated to the required temperature T and then kept unchanged before winding, so that the diaphragm 103 can be adjusted to the same thickness throughout the winding process.

[0122] Optionally, during the winding process, the misalignment between the wound tabs 1011B can be measured online. For example, the misalignment can be detected once every N turns of winding, and the adjustment amount of the passive roller 3 and the heating temperature of the heating component 7 can be adjusted in real time according to the online detected misalignment, so as to adjust the thickness of the diaphragm 103 according to the actual winding requirements, which can further improve the alignment of the tabs 10D.

[0123] This embodiment can quantitatively determine the adjustment amount of the passive roller 3 and the heating temperature of the heating component 7 based on the misalignment of the tab 10D in the circumferential direction of the electrode assembly 10, thereby improving the alignment accuracy of the tab 10D. Moreover, the controller 9 can automatically adjust the passive roller 3 and the heating component 7.

[0124] In some embodiments, such as Figure 11 As shown, the diaphragm thickness adjustment device 100 may further include a controller 9, wherein,

[0125] The controller 9 is configured to move the passive roller 3 away from the active roller 2 and reduce the heating temperature of the heating assembly 7 when the outermost tab 1011B is misaligned relative to the innermost tab 1011B in the winding direction of the wound electrode assembly 10; and / or

[0126] The controller 9 is configured to move the passive roller 3 toward the active roller 2 and increase the heating temperature of the heating assembly 7 when the outermost tab 1011B is misaligned relative to the innermost tab 1011B toward the winding direction of the wound electrode assembly 10.

[0127] In cases where the outermost tab 1011B is misaligned relative to the innermost tab 1011B in the winding direction of the wound electrode assembly 10, it indicates that the thickness of the diaphragm 103 after adjustment is too thin and needs to be increased. Therefore, moving the passive roller 3 away from the active roller 2 can reduce the pressure applied to the diaphragm 103 by the active roller 2 and the passive roller 3, and lower the heating temperature of the heating assembly 7, thereby increasing the difficulty of thinning the diaphragm 103. Both of these factors are conducive to increasing the thickness of the diaphragm 103, so that all tabs 1011B in the same tab 10D can be aligned by adjusting the thickness of the diaphragm 103.

[0128] When the outermost tab 1011B is misaligned relative to the innermost tab 1011B in the opposite direction of the winding of the wound electrode assembly 10, it indicates that the thickness of the diaphragm 103 after adjustment is still too thick and needs to be further reduced. Therefore, moving the passive roller 3 toward the direction closer to the active roller 2 can increase the pressure applied to the diaphragm 103 by the active roller 2 and the passive roller 3, and increase the heating temperature of the heating assembly 7, making it easier to thin the diaphragm 103. Both of these factors are conducive to reducing the thickness of the diaphragm 103, so that all tabs 1011B in the same tab 10D can be aligned by adjusting the thickness of the diaphragm 103.

[0129] For example, after determining the adjustment direction of the passive roller 3 and the changing trend of the heating temperature of the heating component 7, the adjustment amount of the passive roller 3 can be changed according to the first preset step size, and the heating temperature of the heating component 7 can be changed according to the second preset step size, so as to find the adjustment amount of the passive roller 3 and the heating temperature of the heating component 7 that minimizes the misalignment of all tabs 1011B in the same tab 10D.

[0130] This embodiment can determine the adjustment direction of the passive roller 3 and the changing trend of the heating temperature of the heating component 7 based on the misalignment direction of the outermost tab 1011B relative to the innermost tab 1011B, and can adjust the misalignment amount of the tab 10D in a targeted manner to align the tab 10D.

[0131] In some embodiments, such as Figure 9 As shown, the mounting base 1 includes: two fixed plates 11, spaced apart along the axis of the drive roller 2; and multiple support rods 12, connected between the two fixed plates 11. The drive roller 2 and the driven roller 3 are located between the two fixed plates 11. The two ends of the drive roller 2 are respectively mounted on the two fixed plates 11. A first drive component 4 is mounted on the fixed plate 11. Two second drive components 5 are provided and respectively mounted on the two fixed plates 11. The two ends of the driven roller 3 are respectively mounted on the output ends of the two second drive components 5.

[0132] Two fixed plates 11 are arranged in parallel and spaced apart. Multiple support rods 12 are connected between the two fixed plates 11 to form a frame structure. The multiple support rods 12 enclose a hollow area, in which the active roller 2 and the passive roller 3 are located. For example, a cuboid space can be formed by four support rods 12 to accommodate the active roller 2 and the passive roller 3. In order to install the distance detection component 6, another support rod 12 can be installed directly above the passive roller 2. Two guide components 8 can be installed between the left and right sets of support rods 12, and are respectively installed on the two fixed plates 11.

[0133] The two ends of the passive roller 3 are operably mounted on the output ends of the two second drive components 5 respectively. Specifically, the guide component 8 includes: a first guide 81 and a second guide 82. The first guide 81 is disposed on the mounting base 1. The second guide 82 is movably disposed relative to the first guide 81 along the adjustment direction of the passive roller 3. The end of the passive roller 3 is mounted on the second guide 82. The output end of the second drive component 5 is connected to the second guide 82. The second drive component 5 can drive the passive roller 3 to move by driving the second guide 82.

[0134] Optionally, the first driving component 4 is mounted on only one of the fixing plates 11, for example, on the outside of the fixing plate 11. Therefore, the fixing plate 11 is subjected to greater force, which can increase the strength of the fixing plate 11 used to mount the first driving component 4. For example, the fixing plate 11 includes a first plate 111 and a second plate 112 stacked along the thickness direction. The first plate 111 may have the same structure as the other fixing plate 11, and the second plate 112 is fixed to the outside of the first plate 111 for mounting the first driving component 4.

[0135] The mounting base 1 in this embodiment adopts a frame structure assembled from splices. The structure is simple and has high strength and stability, which facilitates the installation of various structural components and provides space for the diaphragm 103 to pass through.

[0136] In some specific embodiments, the gap between the active roller 2 and the passive roller 3 is in the range of 0 to 100 μm, the pressure between the active roller 2 and the passive roller 3 is in the range of 0 to 10000 MPa, the linear speed of the diaphragm 103 is in the range of 0 to 3000 mm / min, the diameters of the active roller 2 and the passive roller 3 can be the same, with a diameter range of 2 to 100 mm, and the heating temperature range is 0 to 100 °C.

[0137] The equipment uses a pressure of 500 MPa applied to the diaphragm 103 as a reference. A positive misalignment indicates that the tab 10D is misaligned in the winding direction, while a negative misalignment indicates that the tab 10D is misaligned in the opposite winding direction. For example... Figure 12As shown, the position of the first tab J1 is consistent with the position of the first tab in a standard battery. However, during winding, the second tab J2 is misaligned in the winding direction, while the third tab J3 is misaligned in the opposite direction. Due to the misalignment of the tabs 10D, the thickness of the separator 103 needs to be adjusted before it is wound with the first electrode 101 and the second electrode 102 to form the electrode assembly 10.

[0138] When the orientation is misaligned in the winding direction, the passive roller 3 is moved away from the active roller 2 to reduce pressure and lower the temperature of the active roller 2 and the passive roller 3; when the orientation is misaligned in the opposite direction of winding, the passive roller 3 is moved closer to the active roller 2 to increase pressure and raise the temperature of the active roller 2 and the passive roller 3, as shown in Table 1. Table 1: Correspondence between misalignment and roller pressing device temperature and pressure applied in the diaphragm thickness direction Pressure (MPa) 50 500 1000 3000 8000 Temperature (°C) 25 50 60 70 85

[0139] This application, by providing a diaphragm thickness adjustment device 100, can control the thickness of the diaphragm 103 during the winding process of the electrode assembly 10, resulting in a superior improvement in the alignment of the tabs 10D for any wound electrode assembly 10. Furthermore, a similar mechanism can be used to adjust the thickness of the first electrode 101 and / or the second electrode 102, thereby increasing the adjustment range of the electrode in the thickness direction after composite bonding and improving the quality consistency of the electrode assembly 10 formed during the winding process.

[0140] When using the diaphragm adjustment device 100 of this application to wind the electrode assembly 10, the following steps may be included: (1) measuring the misalignment of the tab 10D in the electrode assembly; (2) when the misalignment exceeds the product qualification requirements, adjusting the pressure applied to the diaphragm 103 by the active roller 2 and the passive roller 3, and adjusting the heating temperature of the heating component 7 to correct the misalignment of the tab 10D, otherwise no adjustment is made.

[0141] Secondly, this application also provides a method for adjusting the thickness of a diaphragm, comprising:

[0142] S110, the diaphragm 103 passes through the gap formed between the active roller 2 and the passive roller 3, wherein the active roller 2 and the passive roller 3 are installed in parallel;

[0143] S120. Drive the passive roller 3 to move toward or away from the active roller 2 by the second drive component 5, so as to change the pressure applied to both sides of the diaphragm 103 by the active roller 2 and the passive roller 3 by adjusting the gap size.

[0144] S130. The first driving component 4 drives the active roller 2 to rotate around its own axis so that the thickness of the diaphragm 103 can be adjusted during the movement.

[0145] S110 to S130 can be executed sequentially, meaning the position of the passive roller 3 is pre-adjusted and remains unchanged, or S120 can be executed during the execution of S130, meaning the position of the passive roller 3 can be adjusted online during the winding process.

[0146] This embodiment can drive the passive roller 3 to move closer to or further away from the active roller 2 via the second driving component 5, thereby adjusting the pressure applied to both sides of the diaphragm 103 by the active roller 2 and the passive roller 3 by adjusting the gap size, thus adjusting the overall thickness of the diaphragm 103. Therefore, during the winding process to form the electrode assembly 10, the overall thickness of the diaphragm 103 can be adjusted according to the misalignment of the tabs 10D, reducing the misalignment of each tab portion 1011B in the tabs 10D and improving the alignment of each tab portion 1011B in the tabs 10D. Since the negative electrode sheet is subjected to expansion force during production, causing fluctuations in its thickness, and the thickness and surface flatness of the positive and negative electrode sheets after coating with active materials and drying also fluctuate, the winding force applied during the winding of the electrode assembly 10 will also deviate. All of these factors can cause misalignment of the tabs 10D. By producing a diaphragm 103 of fixed thickness and then adjusting the thickness of the diaphragm 103, on-demand adjustment can be achieved.

[0147] Furthermore, the diaphragm 103 possesses good flexibility and extensibility, with a large adjustment range. It is not easily damaged or broken when adjusting the thickness, and has a uniform thickness after adjustment, which can improve the winding quality and yield of the electrode assembly 10. In addition, the diaphragm 103 is driven by the power provided by the first driving component 4, allowing the thickness of the diaphragm 103 to be adjusted along the entire extension direction. This enables online adjustment of the thickness of the diaphragm 103 during the winding process of the electrode assembly 10, thereby improving the production efficiency of the electrode assembly 10.

[0148] In some embodiments, the diaphragm thickness adjustment method of this application further includes:

[0149] During the process of applying pressure to both sides of the diaphragm 103 by the active roller 2 and the passive roller 3, at least one of the active roller 2 and the passive roller 3 is heated by the heating assembly 7.

[0150] This embodiment heats at least one of the active roller 2 and passive roller 3 by setting a heating component 7. This increases the temperature of the diaphragm 103 during the process of the active roller 2 and passive roller 3 applying pressure to the diaphragm 103, making it easier to thin the diaphragm 103. It also reduces the amount of pressure applied by the active roller 2 and passive roller 3, making it easier to flatten the dotted particles in the PCS layer to make the diaphragm 103 thinner, and thus increasing the thickness adjustment range of the diaphragm 103.

[0151] In some embodiments, the diaphragm thickness adjustment method of this application further includes:

[0152] Based on the misalignment of the innermost electrode tab 1011B and the outermost electrode tab 1011B along the circumferential winding direction of the winding electrode assembly 10, the adjustment amount of the passive roller 3 and the heating temperature of the heating assembly 7 are determined.

[0153] This step is performed before S120.

[0154] This embodiment can quantitatively determine the adjustment amount of the passive roller 3 and the heating temperature of the heating component 7 based on the misalignment of the tab 10D in the circumferential direction of the electrode assembly 10, thereby improving the alignment of the tab 10D.

[0155] In some embodiments, the step of determining the adjustment amount of the passive roller 3 and the heating temperature of the heating assembly 7 based on the misalignment amount between the innermost electrode tab 1011B and the outermost electrode tab 1011B along the circumferential winding direction of the wound electrode assembly 10 includes:

[0156] When the outermost tab 1011B is misaligned relative to the innermost tab 1011B in the winding direction of the wound electrode assembly 10, the passive roller 3 is moved away from the active roller 2, and the heating temperature of the heating assembly 7 is reduced; and / or

[0157] When the outermost tab 1011B is misaligned relative to the innermost tab 1011B in the opposite direction of the winding of the wound electrode assembly 10, the passive roller 3 is moved toward the active roller 2, and the heating temperature of the heating assembly 7 is increased.

[0158] This embodiment can determine the adjustment direction of the passive roller 3 and the changing trend of the heating temperature of the heating component 7 based on the misalignment direction of the outermost tab 1011B relative to the innermost tab 1011B, and can adjust the misalignment amount of the tab 10D in a targeted manner to align the tab 10D.

[0159] In some embodiments, the controller 9 described above may be a general-purpose processor, a programmable logic controller (PLC), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any suitable combination thereof for performing the functions described herein.

[0160] 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 diaphragm thickness adjustment device (100), characterized in that, include: Mounting base (1); The active roller (2) and the passive roller (3) are both rotatable around their own axis and are arranged in parallel on the mounting base (1). A gap is formed between the active roller (2) and the passive roller (3) for the diaphragm (103) to pass through, and the position of the passive roller (3) relative to the active roller (2) is adjustable to change the size of the gap. The first drive component (4) is configured to drive the active roller (2) to rotate about its own axis to move the diaphragm (103); The second drive component (5) is configured to drive the passive roller (3) to move toward or away from the active roller (2) to change the pressure applied to both sides of the diaphragm (103) by the active roller (2) and the passive roller (3) by adjusting the gap size, thereby adjusting the thickness of the diaphragm (103) during its movement. The heating assembly (7) is configured to heat at least one of the active roller (2) and the passive roller (3); and The controller (9) is configured to determine the adjustment amount of the passive roller (3) and the heating temperature of the heating assembly (7) based on the misalignment of the innermost tab (1011B) and the outermost tab (1011B) of the wound electrode assembly (10) along the circumferential winding of the electrode assembly (10).

2. The diaphragm thickness adjustment device (100) according to claim 1, characterized in that, It also includes a distance detection component (6), which is disposed on the mounting base (1) and configured to detect the movement distance of the passive roller (3).

3. The diaphragm thickness adjustment device (100) according to claim 1, characterized in that, The active roller (2) and the passive roller (3) are arranged facing each other on both sides of the diaphragm (103).

4. The diaphragm thickness adjusting device (100) according to any one of claims 1 to 3, characterized in that, Also includes: Two guide components (8) are respectively disposed between the two ends of the passive roller (3) and the mounting base (1), and are configured to provide guidance for the movement of the passive roller (3).

5. The diaphragm thickness adjustment device (100) according to claim 4, characterized in that, The guide component (8) includes: A first guide member (81) is disposed on the mounting base (1); and The second guide (82) is movably disposed relative to the first guide (81) along the adjustment direction of the passive roller (3); The passive roller (3) is rotatably mounted at the end of the second guide (82), and the output end of the second drive component (5) is connected to the second guide (82).

6. The diaphragm thickness adjustment device (100) according to claim 5, characterized in that, The heating assembly (7) includes: A first heating element (71), disposed within the drive roller (2), is configured to heat the drive roller (2); and / or The second heating element (72) is provided inside the passive roller (3) and is configured to heat the passive roller (3).

7. The diaphragm thickness adjustment device (100) according to claim 5, characterized in that, It also includes a controller (9), wherein, The controller (9) is configured to move the passive roller (3) away from the active roller (2) and reduce the heating temperature of the heating assembly (7) when the outermost tab (1011B) is misaligned relative to the innermost tab (1011B) in the winding direction toward the wound electrode assembly (10); and / or The controller (9) is configured to move the passive roller (3) toward the active roller (2) and increase the heating temperature of the heating assembly (7) when the outermost tab (1011B) is misaligned relative to the innermost tab (1011B) toward the winding direction of the wound electrode assembly (10).

8. The diaphragm thickness adjusting device (100) according to any one of claims 1 to 3, characterized in that, The mounting base (1) includes: Two fixed plates (11) are spaced apart along the axis of the drive roller (2); and Multiple support rods (12) are connected between the two fixed plates (11); The active roller (2) and the passive roller (3) are located between the two fixed plates (11). The two ends of the active roller (2) are respectively installed on the two fixed plates (11). The first driving component (4) is installed on the fixed plate (11). There are two second driving components (5) and they are respectively installed on the two fixed plates (11). The two ends of the passive roller (3) are respectively operably installed on the output ends of the two second driving components (5).

9. A winding electrode assembly production system, characterized in that, include: The unwinding device (200) is configured to release the wound diaphragm (103). The winding device (300) is configured to wind a first electrode (101), a second electrode (102) and the diaphragm (103) to form an electrode assembly (10), wherein the first electrode (101) and the second electrode (102) have opposite polarities; and The diaphragm thickness adjustment device (100) according to any one of claims 1 to 8 is disposed between the unwinding device (200) and the winding device (300) and is configured to adjust the thickness of the diaphragm (103) released by the unwinding device (200).

10. A method for adjusting diaphragm thickness, characterized in that, The diaphragm thickness adjustment device (100) as described in any one of claims 1 to 8 is used, and the diaphragm thickness adjustment method includes: The diaphragm (103) is passed through the gap formed between the active roller (2) and the passive roller (3), wherein the active roller (2) and the passive roller (3) are installed in parallel. The passive roller (3) is driven by the second driving component (5) to move toward or away from the active roller (2) so as to change the pressure applied to both sides of the diaphragm (103) by the active roller (2) and the passive roller (3) by adjusting the gap size; The first driving component (4) drives the active roller (2) to rotate around its own axis so that the thickness of the diaphragm (103) can be adjusted during the movement.

11. The diaphragm thickness adjustment method according to claim 10, characterized in that, Also includes: During the process of the active roller (2) and the passive roller (3) applying pressure to both sides of the diaphragm (103), at least one of the active roller (2) and the passive roller (3) is heated by the heating assembly (7).

12. The diaphragm thickness adjustment method according to claim 11, characterized in that, Also includes: The adjustment amount of the passive roller (3) and the heating temperature of the heating component (7) are determined based on the misalignment between the innermost electrode tab (1011B) and the outermost electrode tab (1011B) in the circumferential direction of the winding of the electrode assembly (10).

13. The diaphragm thickness adjustment method according to claim 12, characterized in that, The steps for determining the adjustment amount of the passive roller (3) and the heating temperature of the heating assembly (7) based on the misalignment of the innermost electrode tab (1011B) and the outermost electrode tab (1011B) along the circumferential direction of the winding of the electrode assembly (10) include: When the outermost tab (1011B) is misaligned relative to the innermost tab (1011B) in the winding direction toward the wound electrode assembly (10), the passive roller (3) is moved away from the active roller (2), and the heating temperature of the heating assembly (7) is reduced; and / or When the outermost tab (1011B) is misaligned relative to the innermost tab (1011B) in the opposite direction of the winding of the wound electrode assembly (10), the passive roller (3) is moved toward the active roller (2) and the heating temperature of the heating assembly (7) is increased.

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