Press rolls, laminating mechanisms and battery processing equipment

Abstract

The utility model provides a kind of compression roller, composite mechanism and battery processing equipment, the compression roller's circumferential side has multiple spaced apart protruding parts, multiple the protruding part side of the axis of the compression roller is formed the working surface of the compression roller, the working surface is used to polar piece, and diaphragm with adhesive layer are pressed, so that the polar piece and the diaphragm composite.The compression roller is distributed by multiple spaced apart protruding parts in circumferential side, multiple protruding parts form discontinuous working surface, while guaranteeing composite quality, improve liquid injection efficiency and improve electrolyte infiltration effect.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to pressure rollers, composite mechanisms, and battery processing equipment. Background Technology

[0002] In the production process of battery cell packs, pressure rollers are usually used to press the electrode sheets and the separator with adhesive to combine the positive and negative electrode sheets and the separator together. Then, they are wound or stacked to form a cell pack.

[0003] However, in practical applications, it has been found that when conventional pressure rollers are used for lamination, the adhesion between the electrode and the diaphragm is too dense, which makes subsequent electrolyte injection difficult, resulting in low injection efficiency and poor wetting effect. Utility Model Content

[0004] The embodiments of this utility model provide a pressure roller, a composite mechanism, and a battery processing equipment, which improve the injection efficiency and electrolyte wetting effect while ensuring the composite quality, thereby at least partially solving the above-mentioned technical problems.

[0005] In a first aspect, an embodiment of the present invention provides a pressure roller, wherein the pressure roller has a plurality of spaced protrusions on its periphery, and the side of the plurality of protrusions opposite to the axis of the pressure roller forms the working surface of the pressure roller. The working surface is used to press an electrode sheet and a diaphragm having an adhesive layer, so that the electrode sheet and the diaphragm are composite.

[0006] In one embodiment, each of the protrusions extends circumferentially along the pressure roller, and a plurality of the protrusions are arranged axially along the pressure roller; or,

[0007] Each of the protrusions extends axially along the pressure roller, and a plurality of the protrusions are arranged circumferentially along the pressure roller.

[0008] In one embodiment, the plurality of protrusions include multiple sets of protrusions arranged along the axial direction of the pressure roller, and each set of protrusions includes multiple protrusions arranged circumferentially along the pressure roller.

[0009] In one embodiment, the cross-sectional area of ​​at least one of the protrusions gradually decreases in the direction from the axis of the pressure roller toward the protrusion.

[0010] In one embodiment, the protrusion height of the protrusion is between 0.2 mm and 2 mm.

[0011] In one embodiment, the protrusion has a dimension between 2 mm and 15 mm in the circumferential direction and / or the axial direction of the pressure roller; and / or,

[0012] The spacing between adjacent protrusions is between 0.3 mm and 5 mm in the circumferential direction and / or the axial direction of the pressure roller.

[0013] In one embodiment, the ratio of the area of ​​the working surface to the total area of ​​the peripheral side surface of the pressure roller is between 60% and 80%.

[0014] Secondly, embodiments of the present invention provide a composite mechanism including two pressure rollers, the two pressure rollers being arranged opposite each other and spaced apart, and an electrode sheet and a diaphragm with an adhesive layer being inserted between the two pressure rollers, and at least one of the pressure rollers including any of the pressure rollers described above.

[0015] In one embodiment, the two pressure rollers are provided in two sets at intervals;

[0016] In one group, two pressure rollers are used to pass through two diaphragms and sandwich an electrode between the two diaphragms, so that the two diaphragms and the electrode are combined to form an intermediate component; in another group, two pressure rollers are used to pass through the intermediate component and another electrode, so that the two diaphragms and the two electrodes are combined.

[0017] In one embodiment, the composite mechanism further includes a heating device for heating at least one of the pressure rollers and / or the electrode sheets.

[0018] Thirdly, embodiments of this utility model provide a battery processing device, including the pressure roller as described in any of the above claims or the composite mechanism as described in any of the above claims.

[0019] The beneficial effects of the embodiments of this utility model are as follows:

[0020] In embodiments of this invention, the pressure roller has multiple spaced protrusions on its circumference, forming a discontinuous working surface. During the lamination process, pressure is applied only to certain areas of the electrode and the separator with the adhesive layer by these protrusions, ensuring dense lamination in those areas and guaranteeing lamination quality. Other areas of the electrode and separator are not effectively compressed, failing to form a dense composite structure and maintaining low bonding strength or loose contact, thus leaving gaps. These gaps provide channels for electrolyte retention and penetration, allowing the electrolyte to quickly fill and wet the inside of the battery cell during injection, thereby improving injection efficiency and electrolyte wetting effect. In summary, the pressure roller, by having multiple spaced protrusions on its circumference forming a discontinuous working surface, improves injection efficiency and electrolyte wetting effect while ensuring lamination quality. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional schematic diagram of the first structure of the pressure roller provided in the embodiment of this utility model;

[0023] Figure 2 yes Figure 1 A front view of the pressure roller in the middle;

[0024] Figure 3 This is a three-dimensional schematic diagram of the second structure of the pressure roller provided in the embodiment of this utility model;

[0025] Figure 4 yes Figure 3 A front view of the pressure roller in the middle;

[0026] Figure 5 This is a three-dimensional schematic diagram of the third structure of the pressure roller provided in the embodiment of this utility model;

[0027] Figure 6 yes Figure 5 A front view of the pressure roller in the middle;

[0028] Figure 7 This is a schematic diagram of the composite mechanism provided in an embodiment of the present invention.

[0029] Figure label:

[0030] 1000, Composite mechanism; 100, Pressure roller; 10, Working surface; 1, Protrusion; 200, Electrode; 300, Diaphragm. Detailed Implementation

[0031] 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.

[0032] Please see Figure 1 and Figure 2 The present invention provides a pressure roller 100, which has a plurality of spaced protrusions 1 on its periphery. The side of the plurality of protrusions 1 away from the axis of the pressure roller 100 forms a working surface 10 of the pressure roller 100. The working surface 10 is used to press the electrode 200 and the diaphragm 300 with an adhesive layer, so that the electrode 200 and the diaphragm 300 are composite.

[0033] In the technical solution of this application, the pressure roller 100 has multiple spaced protrusions 1 on its circumference, forming a discontinuous working surface 10. During the composite process, pressure is applied only to a portion of the electrode 200 and the diaphragm 300 with the adhesive layer by the multiple protrusions 1, enabling dense composite formation in that area and ensuring composite quality. Other areas of the electrode 200 and the diaphragm 300 are not effectively compressed, failing to form a dense composite structure and maintaining low bonding strength or loose contact, thus leaving gaps. These gaps provide channels for electrolyte retention and penetration, allowing the electrolyte to quickly fill and wet the inside of the battery cell during injection, thereby improving injection efficiency and electrolyte wetting effect. In summary, the pressure roller 100, by having multiple spaced protrusions 1 on its circumference forming a discontinuous working surface 10, ensures composite quality while improving injection efficiency and electrolyte wetting effect.

[0034] Understandably, the multiple spaced protrusions 1 also prevent large-area close contact between the pressure roller 100 and the electrode 200 and / or the diaphragm 300, reducing the risk of material adhesion. After pressing, the electrode 200 and the diaphragm 300 are more easily detached from the surface of the pressure roller 100, improving demolding performance, reducing material damage or equipment downtime for cleaning caused by adhesion, and further improving the stability and production efficiency of the composite process.

[0035] This application does not limit how the protrusion 1 is manufactured in the pressure roller 100. In some embodiments, a flat pressure roller 100 substrate can be manufactured first, and then the required protrusion 1 can be formed on the surface of the pressure roller 100 by milling, laser engraving, electrical discharge machining, etc. In other embodiments, the pressure roller 100 with the protrusion 1 can also be directly prepared by integral molding processes such as integral casting, forging, or 3D printing.

[0036] It is understood that the electrode 200 and the diaphragm 300 have a length direction and a width direction, wherein the length direction is the main direction of movement of the electrode 200 and the diaphragm 300 during the conveying, compounding or forming process (see...). Figure 7In the diagram (from left to right), the width direction is perpendicular to the length direction, which is its lateral unfolding direction. Correspondingly, the circumferential direction of the pressure roller 100 corresponds to the length direction of the electrode 200 and the diaphragm 300, and the axial direction of the pressure roller 100 corresponds to the width direction of the electrode 200 and the diaphragm 300. Therefore, by rationally setting the distribution of the protrusions 1, the composite requirements of the electrode 200 and the diaphragm 300 in different directions can be adapted, thereby achieving effective control of the composite structure.

[0037] Please see Figure 1 and Figure 2 In some embodiments, each protrusion 1 extends circumferentially along the pressure roller 100, and multiple protrusions 1 are arranged axially along the pressure roller 100. "Extending circumferentially" here means that the protrusions 1 extend continuously and uninterruptedly around the pressure roller 100, forming a complete annular structure around the pressure roller 100, or an approximately annular structure that substantially encircles the roller (e.g., covering more than 80% of the circumferential length). In these embodiments, multiple protrusions 1 form multiple composite bands extending along the length direction and spaced apart in the width direction on the electrode 200 and the diaphragm 300, while unpressurized areas are retained between adjacent composite bands, thereby providing permeation channels for the electrolyte. This structure, while ensuring uniform distribution of composite strength, helps improve the fluidity of the electrolyte within the cell, increases injection efficiency, and improves the wetting effect of the electrolyte.

[0038] In some embodiments, each protrusion 1 extends axially along the pressure roller 100, and multiple protrusions 1 are arranged circumferentially along the pressure roller 100. "Extending axially" here means that the protrusions 1 extend continuously and uninterruptedly along the axial direction of the pressure roller 100, extending through the entire axial length or nearly continuously (e.g., covering more than 80% of the axial length), thereby forming an axially extending strip-like structure. In these embodiments, multiple protrusions 1 form multiple composite strips extending in the width direction and spaced apart in the length direction on the electrode 200 and the diaphragm 300, while unpressurized areas are retained between adjacent composite strips, thereby providing a permeation channel for the electrolyte. This structure, while ensuring a uniform distribution of composite strength, helps to improve the fluidity of the electrolyte inside the cell, increase the injection efficiency, and improve the wetting effect of the electrolyte.

[0039] Please see Figure 3 and Figure 4 ,or Figure 5 and Figure 6In some embodiments, the plurality of protrusions 1 include multiple sets of protrusions 1 arranged along the axial direction of the pressure roller 100, and each set of protrusions 1 includes multiple protrusions 1 arranged circumferentially along the pressure roller 100. In these embodiments, each set of protrusions 1 consists of multiple independent protrusions 1 spaced apart circumferentially along the pressure roller 100, rather than a continuous annular structure. All protrusions 1 form a matrix or grid distribution on the periphery of the pressure roller 100, forming regularly arranged composite areas and unpressurized areas on the electrode 200 and diaphragm 300, so that the electrolyte can obtain a good penetration path in both the length and width directions. Thus, while the composite strength is evenly distributed, the injection efficiency and wetting uniformity are improved.

[0040] Please see Figure 5 and Figure 6 In some embodiments, the cross-sectional area of ​​at least one protrusion 1 gradually decreases in the direction from the axis of the pressure roller 100 toward the protrusion 1. In these embodiments, the cross-sectional area of ​​the protrusion 1 is larger at its root (closer to the axis of the pressure roller 100) and smaller closer to the tip of the protrusion 1 (away from the axis of the pressure roller 100), forming an overall "conical" or "tapered" structure. This structure can concentrate pressure at the tip of the protrusion 1 during the lamination process, creating higher local pressure, thereby enhancing the bonding strength between the electrode 200 and the diaphragm 300 in this area and ensuring lamination quality.

[0041] Please see Figure 1 and Figure 2 In some embodiments, the protrusion height of the protrusion 1 (see...) Figure 2 The height of the protrusion 1 is between 0.2 mm and 2 mm. It is understandable that if the height of the protrusion 1 is too small, under pressure, the pressure roller 100 may deform, causing the non-protrusion 1 area to still exert pressure on the electrode 200 and diaphragm 300, causing them to participate in the composite process, thus affecting the retention of electrolyte channels. Conversely, if the height of the protrusion 1 is too large, it will increase processing difficulty and may lead to a decrease in the structural strength of the pressure roller 100 and a shortened service life. Therefore, in these embodiments, limiting the protrusion height to the range of 0.2 mm to 2 mm ensures that during the composite process, only the protrusion 1 applies effective pressure to the electrode 200 and the diaphragm 300 with the adhesive layer, thereby achieving dense composite in the corresponding area. The remaining areas not compressed by the protrusion 1 maintain a lower bonding strength or are in a loose contact state, providing retention and penetration channels for the electrolyte. In this way, selective composite is achieved while also considering the processing feasibility and operational stability of the equipment. Specifically, the protrusion height of the protrusion 1 can be 0.2mm, 0.5mm, 0.8mm, 1mm, 1.5mm or 2mm, etc.

[0042] Please see Figure 1 and Figure 2In some embodiments, the dimensions of the protrusion 1 in the circumferential direction and / or axial direction of the pressure roller 100 (see...) Figure 2 a) is between 2 mm and 15 mm; and / or, the spacing between adjacent protrusions 1 (see Figure 2 In section b), the dimensions of the pressure roller 100 in the circumferential direction and / or axial direction are between 0.3 mm and 5 mm. It is understood that if the size of the protrusion 1 is too small or the spacing between adjacent protrusions 1 is too large, the effective composite area may be insufficient, affecting the bonding strength between the electrode 200 and the separator 300, thus reducing the composite quality. Conversely, if the size of the protrusion 1 is too large or the spacing between adjacent protrusions 1 is too small, it will compress the space of the unpressed area, reducing the number of electrolyte retention and penetration channels, which is detrimental to improving injection efficiency and wetting effect. Therefore, in these embodiments, limiting the size of the protrusion 1 to the range of 2 mm to 15 mm, and / or limiting the spacing between adjacent protrusions 1 to the range of 0.3 mm to 5 mm, ensures sufficient bonding strength in the composite area while retaining sufficient non-composite area to form effective electrolyte channels, thereby improving the electrolyte wetting performance inside the cell while achieving stable composite. In this way, while meeting the actual process requirements, a balance is struck between composite strength and electrolyte permeability, which is beneficial to the processing accuracy of the equipment and the stability of long-term use. Specifically, the size of the protrusion 1 can be 2mm, 3mm, 5mm, 10mm, 12mm or 15mm, etc., and the distance between adjacent protrusions 1 can be 0.3mm, 0.5mm, 1mm, 2mm, 3mm or 5mm, etc.

[0043] It should be noted that the term "and / or" in this application is used only to describe the relationship between two related objects and indicates that there are three possible combinations. For example, "A and / or B" means any one of the following three situations: A exists alone, A and B exist simultaneously, or B exists alone. This expression helps to clearly express the multiple possibilities of connection between multiple technical features without repeatedly listing all combinations.

[0044] Please see Figure 1 and Figure 2In some embodiments, the ratio of the area of ​​the working surface 10 to the total area of ​​the peripheral surface of the pressure roller 100 is between 60% and 80%. In these embodiments, the "working surface 10" refers to the side surface of the plurality of protrusions 1 facing away from the axis of the pressure roller 100, that is, the area that directly contacts the electrode 200 and the diaphragm 300 and applies composite pressure, and its area is the sum of the areas of the top surfaces of all the protrusions 1; while the "total peripheral surface area of ​​the pressure roller 100" refers to the complete peripheral surface area that the pressure roller 100 should have, assuming that the gaps between the plurality of protrusions 1 are filled and the surface of the pressure roller 100 is continuous, excluding the side surface area of ​​the protrusions 1. This ratio range is designed to ensure sufficient bonding area between the electrode 200 and the diaphragm 300 while retaining an appropriate amount of unpressurized area, thereby forming an effective electrolyte retention and permeation channel. If this ratio is too low, meaning the working surface 10 occupies too small a proportion, it may lead to insufficient overall bonding strength, affecting the composite quality. Conversely, if the ratio is too high, it will compress the space of the non-composite area, reducing the electrolyte wetting efficiency and even affecting the uniformity of electrolyte injection. Therefore, controlling the ratio of the working surface 10 to the circumferential area of ​​the pressure roller 100 within the range of 60% to 80% is beneficial for achieving a good balance between composite strength and electrolyte penetration performance, meeting the dual requirements of cell performance and manufacturing stability in actual production.

[0045] In some specific embodiments, the pressure roller 100 provided in this application is used to perform thermal bonding treatment on the electrode 200 and separator 300 of a large-capacity energy storage battery. The protrusion height of the protrusion 1 is 1 mm, the distance between adjacent protrusions 1 is 2 mm, and the extension dimension of a single protrusion 1 on the surface of the pressure roller 100 is 5 mm. During actual operation, the pressure roller 100 exhibits good bonding stability, with no abnormal phenomena such as electrode 200 warping, separator 300 shifting, or electrode detachment. The bonded electrode 200 and separator 300 can smoothly enter the subsequent Z-type stacking process. After stacking, the battery cell flows normally to the electrolyte injection process. The results show that compared with the process using the traditional continuous working surface pressure roller 100, the electrolyte injection time is shortened by approximately 30%, and the electrolyte wetting time is shortened from the original 24 hours to 10 hours. Furthermore, after 10 hours of immersion, no lithium plating was observed in electrode 200 under full charge, indicating that the electrolyte had achieved sufficient immersion and met the performance and safety requirements of the battery cell. This embodiment fully verifies the feasibility and technical advantages of the pressure roller 100 structure in ensuring composite quality, optimizing electrolyte channel design, and improving production efficiency.

[0046] Please see Figure 7Secondly, embodiments of this utility model provide a composite mechanism 1000, including two pressure rollers 100, which are arranged opposite to each other and spaced apart. An electrode 200 and a diaphragm 300 with an adhesive layer are inserted between the two pressure rollers 100. The structure of at least one pressure roller 100 is as described above. Since this composite mechanism 1000 adopts all the technical solutions of the above embodiments, it at least has the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated further here. In these embodiments, the two pressure rollers 100 form a composite area by rotating in opposite directions. The use of a double-roller extrusion pressing method helps to achieve continuous production and improve composite efficiency and uniformity.

[0047] However, it should be understood that this application is not limited to a double roller structure. A single pressure roller 100 can also be used in conjunction with a support platform to achieve partial composite by pressing the electrode 200 and diaphragm 300 onto the fixed platform.

[0048] Please see Figure 7 In some embodiments, two sets of pressure rollers 100 are arranged at intervals; wherein, one set of two pressure rollers 100 ( Figure 7 Between the two pressure rollers 100 on the left side, two diaphragms 300 are threaded through, and an electrode 200 is sandwiched between the two diaphragms 300, so that the two diaphragms 300 and the electrode 200 are combined to form an intermediate assembly; the other set of two pressure rollers 100 ( Figure 7 The middle component and another electrode 200 are passed between the two pressure rollers 100 on the right side, so that the two diaphragms 300 and the two electrodes 200 are combined. In these embodiments, two sets of pressure rollers 100 are provided. The first set of pressure rollers 100 is used to press two diaphragms 300 and an electrode 200 (positive electrode 200 or negative electrode 200) sandwiched between the two diaphragms 300, so that the two diaphragms 300 and the electrode 200 are combined into an intermediate component. The second set of pressure rollers 100 is used to further combine the intermediate component with another electrode 200 (negative electrode 200 or positive electrode 200), and finally form a laminated structure composed of two diaphragms 300 and two electrodes 200 (positive electrode 200 and negative electrode 200). The electrode 200 and diaphragm 300 are pressed in a stepwise composite manner, which can effectively avoid composite defects caused by uneven thickness, inconsistent pressure distribution or material displacement when multiple materials are pressed at the same time, thereby improving the consistency of composite quality and process stability.

[0049] In some embodiments, the composite mechanism 1000 further includes a heating device (not shown) for heating at least one pressure roller 100 and / or electrode 200. In these embodiments, by providing the heating device, the surface of the pressure roller 100 or the electrode 200 can be heated during the composite process, causing the adhesive layer on the diaphragm 300 to reach its activation temperature, thereby enhancing the bonding strength between the electrode 200 and the diaphragm 300. Furthermore, heating can improve the plastic deformation capacity of the material, increase the bonding uniformity during the composite process, reduce defects such as bubbles and voids, and further improve the composite quality.

[0050] In some specific embodiments, the heating device may include various forms, such as: an electric heating wire or heating tube embedded inside the pressure roller 100, which can achieve stable heating of the pressure roller 100 body; or a flow channel structure for the heating medium to circulate inside the pressure roller 100, which can achieve temperature-controlled heating by introducing hot oil, hot water or steam; or a heating roller structure can be used to preheat the electrode 200 before it enters the composite area of ​​the pressure roller 100; in addition, an infrared heating module or an electromagnetic induction heating device can be used to achieve non-contact heating or fast-response high-efficiency heating, respectively. All of the above heating methods can be used individually or in combination according to actual process requirements to meet the requirements for heating efficiency, temperature uniformity and process adaptability under different composite conditions, thereby further improving the composite quality and the stability of equipment operation.

[0051] Thirdly, embodiments of this utility model provide a battery processing apparatus, including a pressure roller 100 or a composite mechanism 1000, the structure of which is as described in any of the embodiments above. Since this battery processing apparatus employs the pressure roller 100 structure and composite mechanism 1000 provided in the above embodiments, it possesses at least all of their technical effects, which will not be elaborated upon here.

[0052] In some embodiments, the battery processing equipment further includes a stacking device, an electrode 200 unwinding mechanism, a separator 300 unwinding mechanism, and a feeding and guiding assembly, for realizing continuous feeding, selective composite, and efficient stacking of the electrode 200 and separator 300. Through the above structural design, not only can the stability and consistency of the composite process be improved, but the wetting performance of the electrolyte inside the cell can also be effectively improved, shortening the electrolyte injection and wetting time, thereby improving the overall battery production efficiency and product yield.

[0053] In some specific embodiments, the thermal bonding unit production process of the battery processing equipment includes the following steps: First, the materials are unwound, and the electrode 200 and the separator 300 with the adhesive layer are smoothly fed out from their respective unwinding mechanisms; then, the electrode 200 is heated to raise its surface temperature to a suitable process range; next, the electrode 200 is cut to a set size by a cutting and feeding device and accurately conveyed to the bonding area to ensure that its relative position with the separator 300 meets the process requirements; during the thermal bonding stage, pressure is applied to the electrode 200 and the separator 300 by the pressure roller 100 and a certain temperature is maintained, so that the adhesive layer is fully activated and local selective bonding is achieved, forming a composite structure with a distribution of adhesive and non-adhesive areas. The treatment method of the separator 300 can be flexibly adjusted according to the different subsequent stacking processes. For example, when using a Z-shaped folding stacking process, the separator 300 can be kept continuous without cutting, reducing process complexity and improving production efficiency. However, in a stacked cell structure, the separator 300 needs to be precisely cut to ensure neat stacking after lamination, preventing interlayer misalignment or displacement. The resulting thermally bonded unit not only possesses good bonding strength but also retains sufficient non-bonded areas as electrolyte retention and penetration channels, helping to improve electrolyte injection efficiency and wetting effect, thereby significantly improving the overall performance and manufacturing stability of the cell.

[0054] It should be noted that adhesive layers are provided on both opposite surfaces of the diaphragm 300. However, in the non-hot-pressed state, these adhesive layers have little or no adhesion and will not adhere to the surface of the pressure roller 100, thus avoiding operational abnormalities caused by material sticking to the roller during the lamination process. Of course, in non-hot-pressing processes, the non-adhesiveness of the adhesive layer can be further controlled by optimizing the surface material or coating of the pressure roller 100, such as by using low surface energy materials or anti-sticking treatment processes, ensuring the stability and continuity of equipment operation.

[0055] Furthermore, to avoid pressure on non-target areas, the spacing between the two pressure rollers 100 can be dynamically adjusted according to the cutting position of the electrode 200. Specifically, when the material-free area formed by the cutting of the electrode 200 is about to enter between the two pressure rollers 100, the control system will drive the pressure rollers 100 to lift briefly to avoid this area, thus preventing unnecessary pressure on the separator 300 in a position without electrode 200 support. This design not only improves the composite accuracy but also effectively prevents deformation of the separator 300 or damage to the adhesive layer caused by excessive local compression, further enhancing the cell composite quality and the controllability of the production process.

[0056] 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 pressure roller, characterized in that, The pressure roller has a plurality of spaced protrusions on its periphery. The side of the plurality of protrusions away from the axis of the pressure roller forms the working surface of the pressure roller. The working surface is used to press the electrode sheet and the diaphragm with an adhesive layer, so that the electrode sheet and the diaphragm are composite.

2. The pressure roller according to claim 1, characterized in that, Each of the protrusions extends circumferentially along the pressure roller, and a plurality of the protrusions are arranged axially along the pressure roller; or, Each of the protrusions extends axially along the pressure roller, and a plurality of the protrusions are arranged circumferentially along the pressure roller.

3. The pressure roller according to claim 1, characterized in that, The plurality of protrusions include multiple sets of protrusions arranged along the axial direction of the pressure roller, and each set of protrusions includes multiple protrusions arranged circumferentially along the pressure roller.

4. The pressure roller according to claim 1, characterized in that, In the direction from the axis of the pressure roller toward the protrusion, the cross-sectional area of ​​at least one of the protrusions gradually decreases.

5. The pressure roller according to claim 1, characterized in that, The protrusion height of the protrusion is between 0.2 mm and 2 mm.

6. The pressure roller according to claim 1, characterized in that, The protrusion has a dimension between 2 mm and 15 mm in the circumferential direction and / or the axial direction of the pressure roller; and / or, The spacing between adjacent protrusions is between 0.3 mm and 5 mm in the circumferential direction and / or the axial direction of the pressure roller.

7. The pressure roller according to any one of claims 1 to 6, characterized in that, The ratio of the area of ​​the working surface to the total area of ​​the peripheral side surface of the pressure roller is between 60% and 80%.

8. A composite mechanism, characterized in that, It includes two pressure rollers, which are arranged opposite to each other and spaced apart, with an electrode sheet and a diaphragm with an adhesive layer passing through between the two pressure rollers, and at least one of the pressure rollers includes a pressure roller as described in any one of claims 1 to 7.

9. The composite mechanism according to claim 8, characterized in that, The two pressure rollers are spaced in two sets; In one group, two pressure rollers are used to pass through two diaphragms and sandwich an electrode between the two diaphragms, so that the two diaphragms and the electrode are combined to form an intermediate component; in another group, two pressure rollers are used to pass through the intermediate component and another electrode, so that the two diaphragms and the two electrodes are combined.

10. The composite mechanism according to claim 8, characterized in that, The composite mechanism further includes a heating device for heating at least one of the pressure rollers and / or the electrode sheets.

11. A battery processing equipment, characterized in that, It includes the pressure roller as described in any one of claims 1 to 7 or the composite mechanism as described in any one of claims 8 to 10.

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