Production apparatus of a wound electrode assembly

Abstract

The utility model relates to the production technical field of winding electrode assembly, concretely to a kind of production device of winding electrode assembly, and production device includes: coating mechanism is used to coat electrolyte layer, and gap is formed with being worn in pressure roller mechanism, and pressure roller mechanism is used to extrude first pole piece, separator and second pole piece, winding mechanism is used to wind electrode assembly;First detection mechanism is used to detect the thickness size of electrode assembly;Second detection mechanism is used to detect the diameter size of roll core;Deviation rectifying mechanism is used to rectify electrode assembly. Thus, the production device of the present application is locally, quantitatively pre-coated electrolyte layer on the surface of pole piece, and after winding, the pre-coating amount is equal to the molar amount of injection amount, the infiltration time is shortened, the amount of electrolyte is reduced, the quality energy density is improved, at the same time, the electrolyte layer is instantaneously infiltrated by the extrusion of pressure roller mechanism, the adhesion of pole piece-separator is enhanced, the winding and cyclic expansion process is not easy to delaminate and slip, and the risk of lateral deviation of electrode assembly is reduced.

Description

Technical Field

[0001] This utility model relates to the field of winding electrode assembly production technology, and in particular to a production apparatus for winding electrode assemblies. Background Technology

[0002] In related technologies, lithium-ion batteries are rapidly developing towards higher energy density, higher rate capability, and longer cycle life. Due to their compact structure and mature manufacturing process, wound electrode assemblies occupy a mainstream position in both power and energy storage batteries. Wound electrode assemblies are mainly composed of a first electrode, a separator, and a second electrode, which are then wound together. They are manufactured using production equipment.

[0003] After the production unit produces the wound electrode assembly, all the electrolyte is injected at once. Then, the electrolyte is allowed to penetrate to the electrode-separator interface by standing and wetting. This results in a long wetting time, uneven distribution of electrolyte at the interface, and large differences in interface impedance. Consequently, the cycle performance of the battery cell fluctuates significantly. In addition, in order to ensure sufficient wetting, excessive electrolyte is often injected, which wastes materials and increases the weight of the battery cell, which is not conducive to improving the energy density of the battery cell.

[0004] Meanwhile, the front electrode-separator composite tape is prone to lateral displacement during high tension and long-distance tape running, resulting in uneven core end faces and misaligned electrode tabs, which may require rework and scrap in severe cases. Utility Model Content

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a production apparatus for winding electrode assemblies, offering a highly integrated technical solution capable of real-time closed-loop control of electrolyte coating amount, composite thickness, core diameter, and strip offset.

[0006] A production apparatus for a wound electrode assembly according to an embodiment of the present invention, the electrode assembly comprising a first electrode sheet, a separator film, and a second electrode sheet, wherein the first electrode sheet, the separator film, and the second electrode sheet are stacked to form the electrode assembly, and the production apparatus includes:

[0007] The coating mechanism, the pressure roller mechanism, and the winding mechanism are arranged along a first direction. The coating mechanism is located upstream of the pressure roller mechanism, and the winding mechanism is located downstream of the pressure roller mechanism. The coating mechanism is used to coat an electrolyte layer onto the surface of a first electrode or a second electrode. The pressure roller mechanism has a through-gap for the first electrode, the separator, and the second electrode to pass through. The pressure roller mechanism is used to press the first electrode, the separator, and the second electrode to form an electrode assembly. The winding mechanism is used to wind the electrode assembly to form a core.

[0008] The first detection mechanism is located downstream of the pressure roller mechanism and upstream of the winding mechanism. The first detection mechanism is used to detect the thickness of the electrode assembly.

[0009] The second inspection unit is used to inspect the diameter of the core.

[0010] The correction mechanism is located downstream of the pressure roller mechanism and upstream of the winding mechanism. The correction mechanism uses the electrode assembly to correct the deviation.

[0011] According to the production apparatus for the wound electrode assembly of this utility model, the production apparatus pre-coats an electrolyte layer locally and quantitatively on the surface of the electrode sheet. After winding, the amount of electrolyte is reduced by the amount of liquid injected according to the pre-coating amount in equal molar amounts, thereby shortening the immersion time, reducing the amount of electrolyte used, and improving the mass energy density. At the same time, the pressure roller mechanism squeezes the electrolyte layer to instantly wet the interface, enhancing the adhesion between the electrode sheet and the separator. During the winding and cyclic expansion process, it is not easy for the electrode assembly to slip through delamination. Furthermore, it reduces the risk of lateral displacement of the electrode assembly.

[0012] In some examples of this utility model, the correction mechanism includes a correction wheel assembly, which includes a first correction wheel, a second correction wheel, and a first connecting rod. Along the second direction, the first correction wheel and the second correction wheel are located on the same side of the first connecting rod and are rotatably disposed on the first connecting rod. The rotation axis of the first correction wheel and the rotation axis of the second correction wheel are both parallel to the second direction. The first correction wheel and the second correction wheel are opposite to each other and spaced apart along a third direction to form a clamping space for the electrode assembly to pass through. The correction wheel assembly pulls the electrode assembly along the second direction to correct the deviation of the electrode assembly. The first direction, the second direction, and the third direction are perpendicular to each other.

[0013] In some examples of this utility model, the length of the first connecting rod is adjustable along a third direction, so that the interval between the first and second correction wheels is adjustable.

[0014] In some examples of this utility model, there are multiple correction wheel assemblies, which are arranged sequentially at intervals along the first direction.

[0015] In some examples of this utility model, the correction mechanism further includes a connecting structure and a driving structure. The two first connecting rods of any two adjacent correction wheel assemblies are fixedly connected through the connecting structure. The driving structure and the connecting structure are connected by transmission. The driving structure is used to drive the connecting structure to drive the correction wheel assembly to pull the electrode assembly to move along the second direction.

[0016] In some examples of this utility model, the connecting structure includes: a driving block, a second connecting rod, and two mounting brackets. The second connecting rod is connected between the two mounting brackets. The two mounting brackets are respectively fixedly connected to the two first connecting rods of two adjacent correction wheel assemblies. The driving block is fixed to the second connecting rod. The driving structure has a driving rod extending in a second direction. The driving block forms a threaded hole extending in the second direction. The outer peripheral wall of the driving rod forms an external thread. The driving rod is assembled into the threaded hole, and the external thread and the internal thread of the threaded hole are engaged and connected.

[0017] In some examples of this utility model, the drive structure also has a power supply part, which is connected to the drive rod, and the power supply part is used to drive the drive rod to rotate.

[0018] In some examples of this utility model, the connection structure includes multiple second connecting rods, which are parallel to each other and connected between two mounting brackets, and the drive block is fixed to the multiple second connecting rods.

[0019] In some examples of this utility model, the production apparatus further includes a control unit, which is communicatively connected to the first detection mechanism, the second detection mechanism, and the coating mechanism. The control unit is configured to adjust the coating flow rate of the coating mechanism according to the detection information of the first detection mechanism and the detection information of the second detection mechanism.

[0020] In some examples of this utility model, the control unit is also communicatively connected to the pressure roller mechanism, and the control unit is configured to cause the pressure roller mechanism to adjust the width of the threading gap according to the detection information of the first detection mechanism and the detection information of the second detection mechanism.

[0021] The beneficial effects of this utility model are as follows:

[0022] 1. This utility model pre-coats electrolyte locally and quantitatively on the surface of the electrode. After winding, the amount of electrolyte injected is reduced by the amount of pre-coating in equal molar amounts, thereby shortening the wetting time, improving the consistency of the first-time effect, reducing the amount of electrolyte used, and increasing the mass energy density. At the same time, the pressure roller squeezes the electrolyte to instantly wet the interface, enhances the adhesion between the electrode and the separator, and makes it less prone to delamination and slippage during winding and cyclic expansion.

[0023] 2. This utility model uses a thickness-diameter dual closed-loop control. The first detection mechanism monitors the thickness of the electrode assembly in real time, and the second detection mechanism monitors the diameter of the core in real time. The control unit adjusts synchronously according to the detection information.

[0024] 3. This utility model sets up a multi-level synchronous correction structure. The correction mechanism adopts multiple correction wheel assemblies arranged at intervals along the belt direction and linked with a single drive source through a rigid connection structure. The lateral offset is gradually attenuated, improving the correction accuracy. The single drive screw-nut pair achieves self-locking positioning, eliminating the need for an additional pressure holding device, and the structure is compact.

[0025] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0027] Figure 1 A schematic diagram of a production apparatus for a wound electrode assembly provided in this application embodiment;

[0028] Figure 2 A schematic diagram of the correction mechanism provided in the embodiments of this application;

[0029] Figure 3 This is a schematic diagram of one coating method for the electrolyte provided in an embodiment of this application;

[0030] Figure 4 A schematic diagram illustrating another coating method for the electrolyte provided in an embodiment of this application;

[0031] Figure 5 A schematic diagram showing the cooperation of the coating mechanism, pressure roller mechanism, winding mechanism, first detection mechanism, second detection mechanism and electrode assembly provided in the embodiments of this application.

[0032] Figure label:

[0033] 1-Coating mechanism;

[0034] 2-Pressure roller mechanism, 21-Passing gap, 22-First pressure roller, 23-Second pressure roller;

[0035] 3-Winding mechanism;

[0036] 4- The first testing institution;

[0037] 5-Secondary testing agency;

[0038] 6-Correction mechanism, 601-First correction wheel, 602-Second correction wheel, 603-First connecting rod, 604-Drive block, 605-Second connecting rod, 606-Mounting bracket, 607-Drive rod, 608-Clamping space;

[0039] 7-First electrode;

[0040] 8-Separation membrane;

[0041] 9-Second pole sheet;

[0042] 91-Electrolyte layer. Detailed Implementation

[0043] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0044] Please see Figure 1 , Figure 1 This is a schematic diagram of the production apparatus for the winding electrode assembly provided in an embodiment of the present invention.

[0045] This application provides a production apparatus for a wound electrode assembly. The electrode assembly includes a first electrode sheet, a separator film, and a second electrode sheet. The first electrode sheet, the separator film, and the second electrode sheet are stacked to form the electrode assembly. The production apparatus includes:

[0046] The coating mechanism, the pressure roller mechanism, and the winding mechanism are arranged along a first direction. The coating mechanism is located upstream of the pressure roller mechanism, and the winding mechanism is located downstream of the pressure roller mechanism. The coating mechanism is used to coat an electrolyte layer onto the surface of a first electrode or a second electrode. The pressure roller mechanism has a through-gap for the first electrode, the separator, and the second electrode to pass through. The pressure roller mechanism is used to press the first electrode, the separator, and the second electrode to form an electrode assembly. The winding mechanism is used to wind the electrode assembly to form a core.

[0047] It should be noted that, as Figure 1 As shown, the first direction is Figure 1In the X direction. Before the winding process, a layer of electrolyte can be pre-coated locally and quantitatively on the surface of the electrode. After winding, the conventional electrolyte injection operation is still performed, and the amount of the pre-coated electrolyte layer is deducted from the total injection volume. The molar amount of lithium salt in the pre-coated electrolyte and the deducted electrolyte is controlled to be equal, thereby avoiding the decrease in initial coulombic efficiency or increase in interface impedance due to excessive or reduced lithium salt participating in ion conduction. At the same time, the electrolyte layer freshly coated by the coating mechanism is squeezed between the electrode and the separator by the pressure roller, which can fully wet the interface and increase the adhesion between the electrode and the separator. Therefore, even if there is a difference in the force between the layers due to the different surface areas to be covered during the winding process, it is difficult for the electrode and separator to slip or misalign directly. When the wound battery system is made later, it is not easy to delaminate during the cycle expansion process.

[0048] For example, such as Figure 4 As shown, the electrolyte layer coating operation can be performed uniformly and continuously. In this example, the electrolyte layer extends along the length of the electrode and is a single electrolyte layer. Figure 3 and Figure 4 As shown, coating operations can also be performed at certain intervals. In this example, there are multiple electrolyte layers, which are arranged sequentially and spaced apart along the width of the electrode and extend along the length of the electrode. Continuous coating is simpler; the coating mechanism can be directly controlled to continuously coat the electrode. The coated electrode surface is fully pre-wetted, which can reduce the liquid injection-wetting time. Furthermore, the electrode-separator interface impedance distribution is consistent, resulting in smaller capacity and rate fluctuations. However, the amount of electrolyte / lithium salt used is larger, limiting the proportion of liquid injection reduction and easily increasing the overall weight of the electrode.

[0049] For example, if strip or window-shaped methods are used for intermittent coating, the coating effect can be selectively controlled by intermittently starting the coating mechanism. For instance, based on the start time of the mechanism, it can be stopped immediately after 2 seconds of start, and then restarted after a first preset time interval. The first preset time can be a value such as 0.5s, 0.6s, 0.7s, 0.8s, 0.9s, or 1.0s. At this time, the time t after the electrolyte flows out of the coating mechanism and reaches the electrode surface can be adjusted to control the position of the first coating. This controls the relative positional relationship between the coated electrolyte layer and the electrode. The interval between adjacent electrolyte layers is the distance the electrode travels within a value such as 0.5s, 0.6s, 0.7s, 0.8s, 0.9s, or 1.0s.

[0050] The production apparatus also includes a first inspection mechanism, which is located downstream of the pressure roller mechanism and upstream of the winding mechanism. The first inspection mechanism is used to inspect the thickness of the electrode assembly.

[0051] The production unit also includes a second inspection mechanism, which is used to inspect the diameter of the core.

[0052] The correction mechanism is located downstream of the pressure roller mechanism and upstream of the winding mechanism. The correction mechanism uses the electrode assembly to correct the deviation.

[0053] It should be noted that the correction mechanism is configured to adjust the short-range offset of the electrode sheet and the separator in its width direction, and pull them back to the center line before the winding process to improve the core alignment. At the same time, if the electrode tab is left at the edge of the electrode sheet, the strip will deviate and the electrode tab will swing. Setting up the correction mechanism can ensure that the electrode tab is always within the window of laser cutting or ultrasonic welding, reducing rework.

[0054] In some embodiments, the correction mechanism includes a correction wheel assembly, which includes a first correction wheel, a second correction wheel, and a first connecting rod. Along a second direction, the first correction wheel and the second correction wheel are located on the same side of the first connecting rod and are rotatably disposed on the first connecting rod. The rotation axis of the first correction wheel and the rotation axis of the second correction wheel are both parallel to the second direction. The first correction wheel and the second correction wheel are opposite to each other and spaced apart along a third direction to form a clamping space through which the electrode assembly passes. The electrode assembly is pulled along the second direction by the correction wheel assembly to correct the deviation of the electrode assembly. The first direction, the second direction, and the third direction are perpendicular to each other.

[0055] It should be noted that, as Figure 5 As shown, the second direction is Figure 4 In the Y direction. Without excessive interference with the strip winding process, and based on a rotatable wheel system structure to reduce contact friction, the axle of each straightening wheel can be directly connected to the lead screw, or the lead screw can be directly threaded to the inner ring fixed end of the straightening wheel. This allows each wheel to be independently controlled to move in a direction perpendicular to the belt feed, thus enabling each wheel to be independently controlled to move in the second direction.

[0056] This is merely an illustrative example and is not intended to limit the scope of protection of this application. For example, the correction mechanism includes: a roller assembly, which includes a fixing member and a roller rotatably connected thereto. The roller's axial degree of freedom is restricted by the fixing member, and the roller has a rotational degree of freedom along the axis. The fixing member is configured as a hollow ring structure with internal threads on its inner wall. The roller assembly also includes a lead screw, which cooperates with the fixing member and is threaded to each other, so that the roller can independently drive the strip to move in a direction perpendicular to the belt travel.

[0057] In some embodiments, the length of the first connecting rod is adjustable along a third direction, so that the interval between the first and second straightening wheels is adjustable.

[0058] With the adjustable length of the first connecting rod, it is easy to control that the same set of correction wheel assembly can clamp both electrode assemblies with smaller thicknesses and electrode assemblies with larger thicknesses of multi-layer composite layers, without having to disassemble and reassemble the entire correction wheel, which helps to improve the versatility of the correction mechanism.

[0059] In some embodiments, there are multiple correction wheel assemblies, which are arranged sequentially at intervals along a first direction.

[0060] It should be noted that multiple correction wheel assemblies arranged at intervals can distribute the offset control of the electrode assembly among multiple correction wheel assemblies, thereby improving the correction accuracy. If the final offset controlled by a single set of correction wheel assemblies is ±0.2mm, multi-level control can gradually control the offset to ±0.1mm, ±0.05mm, and ±0.03mm. Moreover, multi-level correction wheel assemblies allow for a larger initial deviation upstream.

[0061] In some embodiments, such as Figure 1 and Figure 2 As shown, the correction mechanism also includes a connecting structure and a driving structure. The two first connecting rods of any two adjacent correction wheel assemblies are fixedly connected through the connecting structure. The driving structure and the connecting structure are connected by transmission. The driving structure is used to drive the connecting structure to move the correction wheel assembly along the second direction and pull the electrode assembly.

[0062] It should be noted that by connecting adjacent correction wheel assemblies together through a connection structure and sharing a single drive structure, the movement process is synchronized and there is no phase difference. A single drive can make multiple correction wheels move laterally simultaneously and in the same amount, making overall control more convenient.

[0063] Specifically, the entire correction section is in the third direction, i.e., the thickness direction, where the third direction is... Figure 1 In the Z direction, only one synchronous link (i.e., the connecting structure) and one drive device (i.e., the drive structure) are needed, making the production line more compact and the synchronization rate higher during the control process. When the electrode assembly has a large unidirectional offset, the adjustment and correction operation can be completed in one go, avoiding the time difference that exists in the process of independently controlling each correction wheel, which affects the final correction effect.

[0064] In some embodiments, such as Figure 1 and Figure 2 As shown, the connection structure includes: a drive block, a second connecting rod, and two mounting brackets. The second connecting rod is connected between the two mounting brackets. The two mounting brackets are respectively fixedly connected to the two first connecting rods of two adjacent correction wheel assemblies. The drive block is fixed to the second connecting rod. The drive structure has a drive rod extending in a second direction. The drive block has a threaded hole extending in the second direction. The outer peripheral wall of the drive rod has an external thread. The drive rod is assembled into the threaded hole, and the external thread and the internal thread of the threaded hole are engaged and connected.

[0065] It should be noted that the drive rod can be driven manually or electrically. A single lead screw (i.e., the drive rod) simultaneously pushes and pulls multiple straightening wheels, resulting in high synchronization accuracy of the wheel movements and a small meshing clearance between the lead screw and nut pair. This ensures consistent displacement of multiple connecting rods along the second direction, reducing the remaining deviation of the strip after multi-stage straightening. Furthermore, the drive rod and threaded hole provide self-locking, allowing the straightening position to remain unchanged under reaction force, eliminating the need for additional pneumatic or other methods to maintain position.

[0066] In some embodiments, the drive structure further includes a power supply unit connected to a drive rod, the power supply unit being used to drive the drive rod to rotate. The power supply unit can be a drive motor. Driving the drive rod to rotate via the power supply unit facilitates automatic rotation of the drive rod, eliminating the need for manual rotation and saving labor for workers.

[0067] In some embodiments, the connection structure includes a plurality of second connecting rods, which are parallel to each other and connected between two mounting brackets, and the drive block is fixed to the plurality of second connecting rods.

[0068] It should be noted that the power supply unit can be set as a servo / stepper motor, connected to a drive screw (i.e., drive rod), and then the push / pull force is synchronously distributed to the entire correction mechanism by multiple parallel second connecting rods. It is difficult to bend even with a long span. Therefore, the displacement of the second connecting rod can be effectively transmitted to the correction wheels on both sides, so that multiple correction wheel assemblies move in the same direction.

[0069] In some embodiments, the production apparatus further includes a control unit, which is communicatively connected to the first detection mechanism, the second detection mechanism, and the coating mechanism, and is configured to adjust the coating flow rate of the coating mechanism based on the detection information of the first detection mechanism and the detection information of the second detection mechanism.

[0070] In some embodiments, the control unit is also communicatively connected to the pressure roller mechanism, and the control unit is configured to cause the pressure roller mechanism to adjust the width of the threading gap based on the detection information of the first detection mechanism and the detection information of the second detection mechanism.

[0071] It should be noted that both the first and second detection mechanisms are sensors. The control unit can feed back the detection information from the first and second detection mechanisms to the coating mechanism and the pressure roller mechanism in real time, and can control the coating flow rate and roller gap within the optimal window.

[0072] Specifically, the first detection mechanism detects the thickness of the electrode assembly. If the thickness is too thick or too thin, the control unit can quantitatively adjust the coating pump flow rate to ensure the coating thickness matches the electrode assembly thickness, thus preventing any impact on the winding effect. The second detection mechanism detects the core diameter, providing feedback on changes in the core diameter during winding. If the pressure control of the pressure roller mechanism is inadequate, causing error accumulation during the electrode assembly conveyor and winding process, resulting in an abnormal increase in the core diameter, the control unit can adjust the width of the threading gap to ensure the pressure roller mechanism reaches a suitable value, reducing the risk of an abnormal increase in the core diameter.

[0073] The pressure roller mechanism may include a first pressure roller and a second pressure roller, which are opposite to each other and spaced apart along a third direction to form a through gap between the first pressure roller and the second pressure roller. The pressure roller mechanism is controlled by a control unit to adjust the gap between the first pressure roller and the second pressure roller, thereby changing the width of the through gap.

[0074] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A production apparatus for a wound electrode assembly, characterized in that, The electrode assembly includes a first electrode, a separator, and a second electrode, wherein the first electrode, the separator, and the second electrode are stacked to form the electrode assembly. The production apparatus includes: The system includes a coating mechanism, a pressure roller mechanism, and a winding mechanism, all arranged along a first direction. The coating mechanism is located upstream of the pressure roller mechanism, and the winding mechanism is located downstream of the pressure roller mechanism. The coating mechanism is used to coat an electrolyte layer onto the surface of the first electrode or the second electrode. The pressure roller mechanism has a through-hole for the first electrode, the separator, and the second electrode to pass through. The pressure roller mechanism is used to press the first electrode, the separator, and the second electrode to form the electrode assembly. The winding mechanism is used to wind the electrode assembly to form a core. A first detection mechanism is located downstream of the pressure roller mechanism and upstream of the winding mechanism. The first detection mechanism is used to detect the thickness of the electrode assembly. The second detection mechanism is used to detect the diameter of the core. A correction mechanism is located downstream of the pressure roller mechanism and upstream of the winding mechanism, and the correction mechanism is used to correct the deviation of the electrode assembly.

2. The production apparatus according to claim 1, characterized by The correction mechanism includes a correction wheel assembly, which comprises a first correction wheel, a second correction wheel, and a first connecting rod. Along a second direction, the first correction wheel and the second correction wheel are located on the same side of the first connecting rod and are rotatably mounted on it. The rotation axes of the first correction wheel and the second correction wheel are parallel to the second direction. The first correction wheel and the second correction wheel are opposite to each other and spaced apart along a third direction to form a clamping space through which the electrode assembly passes. The correction wheel assembly pulls the electrode assembly along the second direction to correct its deviation. The first direction, the second direction, and the third direction are perpendicular to each other.

3. The production apparatus according to claim 2, characterized in that, Along the third direction, the length of the first connecting rod is adjustable so that the interval between the first correction wheel and the second correction wheel is adjustable.

4. The production apparatus according to claim 2, characterized by There are multiple correction wheel assemblies, and the multiple correction wheel assemblies are arranged at intervals along the first direction.

5. The production apparatus according to claim 4, characterized by The correction mechanism further includes a connecting structure and a driving structure. The two first connecting rods of any two adjacent correction wheel assemblies are fixedly connected through the connecting structure. The driving structure and the connecting structure are connected in a transmission manner. The driving structure is used to drive the connecting structure to drive the correction wheel assembly to pull the electrode assembly along the second direction.

6. The production apparatus according to claim 5, characterized by The connection structure includes a drive block, a second connecting rod, and two mounting brackets. The second connecting rod is connected between the two mounting brackets. The two mounting brackets are respectively fixedly connected to the two first connecting rods of the two adjacent correction wheel assemblies. The drive block is fixed to the second connecting rod. The drive structure has a drive rod extending along the second direction. The drive block has a threaded hole extending along the second direction. The outer peripheral wall of the drive rod has an external thread. The drive rod is assembled into the threaded hole. The external thread and the internal thread of the threaded hole are engaged and connected.

7. The production apparatus according to claim 6, characterized by The drive structure also has a power supply unit, which is connected to the drive rod, and the power supply unit is used to drive the drive rod to rotate.

8. The production apparatus according to claim 6, characterized by The connection structure includes a plurality of second connecting rods, which are parallel to each other and connected between the two mounting brackets. The drive block is fixed to the plurality of second connecting rods.

9. The production apparatus according to any one of claims 1 to 8, characterized by, The production apparatus further includes a control unit, which is communicatively connected to the first detection mechanism, the second detection mechanism, and the coating mechanism. The control unit is configured to adjust the coating flow rate of the coating mechanism based on the detection information of the first detection mechanism and the detection information of the second detection mechanism.

10. The production apparatus according to claim 9, characterized by The control unit is also communicatively connected to the pressure roller mechanism, and the control unit is configured to cause the pressure roller mechanism to adjust the width of the threading gap according to the detection information of the first detection mechanism and the detection information of the second detection mechanism.

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