Flattening roller and coating machine

Abstract

The utility model discloses a flattening roller which comprises a roller body provided with an inner cavity, and through holes distributed at intervals are formed in the surface of the roller body. The air bag is arranged in the inner cavity of the roller body; the rubber coating layer is arranged on the outer side of the roller body in a sleeving manner, and the rubber coating layer has elasticity; the key strips are distributed on the surface of the air bag at intervals, and the key strips can respond to expansion of the air bag, penetrate out of the through hole of the roller body and abut against the rubber coating layer, so that the diameter of the rubber coating layer is changed. The key strip abuts against the rubber coating layer in response to expansion of the air bag, so that the diameter of the rubber coating layer is changed, and the length of the key strip is gradually reduced from the middle to the two sides of the air bag, so that the diameter of the rubber coating layer is gradually reduced from the middle to the two ends. During use, the diameter of the flattening roller can be adjusted in real time according to the width of the blank in the middle of the pole piece, drying conditions and the like, so that the stress for coating the pole piece is released to two sides, and the phenomenon of wrinkling of the blank area in the middle is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, specifically a flattening roller and a coating machine. Background Technology

[0002] Due to the technological characteristics of battery production and the high demand for lithium battery energy density, various methods such as formula optimization, material specific capacity improvement, and foil thinning are used to improve the energy density of a single cell. Currently, the mainstream negative electrode foil is 6μm thick. In order to pursue higher product capacity, 5μm or 4μm copper foil has been introduced for negative electrode foil. However, with the continuous optimization of foil thinning process, the stress on the foil increases and the tensile strength of thinner foil is lower. The surface tension of the coated area and the blank area increases. During the drying process of coating, the surface tension of the foil changes, and wrinkling phenomenon frequently occurs in the blank area in the middle of the double-strip zebra coating after exiting the oven. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, this utility model provides a flattening roller and a coating machine. The flattening roller is installed at the outlet of the drying oven of the coating machine to flatten the dried foil. The flattening roller has an inflatable or contractible air bladder inside. Along the length of the air bladder, there are key strips whose length decreases from the middle to both sides. The key strips respond to the expansion of the air bladder to press against the coating layer, thereby changing the diameter of the coating layer. Since the length of the key strips decreases from the middle to both sides of the air bladder, the diameter of the coating layer also decreases from the middle to both ends. When using this flattening roller, the diameter of the flattening roller can be adjusted in real time according to the width of the blank area in the middle of the electrode, the coating speed, and the drying conditions, so that the stress of the coated electrode is released to both sides, improving the wrinkling phenomenon in the blank area in the middle.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a flattening roller, comprising:

[0005] The roller body has an inner cavity and the surface of the roller body is provided with through holes spaced apart.

[0006] An airbag is disposed within the inner cavity of the roller body;

[0007] A rubber coating layer is sleeved on the outside of the roller body, and the rubber coating layer is elastic;

[0008] Key bars are spaced apart on the surface of the air bladder. The key bars can respond to the expansion of the air bladder, pass through the through hole of the roller body, and abut against the rubber coating layer, thereby changing the diameter of the rubber coating layer.

[0009] Furthermore, along the length of the airbag, the length of the key bar decreases from the middle to both ends.

[0010] The above-described scheme involves placing the flattening roller at the outlet of the coating machine's oven to flatten the dried foil. The flattening roller contains an expandable or contractible air bladder. Along the length of the air bladder, key strips of decreasing length from the center to both sides are installed. These key strips respond to the expansion or contraction of the air bladder, pressing against the coating layer and thus changing its diameter. Because the key strips decrease in length from the center of the air bladder to both sides, the diameter of the coating layer also decreases from the center to both ends. The diameter of the flattening roller can be adjusted in real time according to the width of the blank area in the center of the electrode, the coating speed, and drying conditions. This releases the stress on the coated electrode to both sides, improving the wrinkling phenomenon in the blank area.

[0011] Furthermore, the airbag is provided with an inflation port;

[0012] The roller body is provided with at least one air nozzle that communicates with the inflation port of the airbag.

[0013] The air nozzle on the roller body can be connected to an external air supply device to realize the automatic inflation and deflation of the airbag, thereby realizing the expansion or contraction function of the airbag.

[0014] Furthermore, the airbag has through-holes at both ends, and both ends of the airbag are sealed to the roller body. Each end of the roller body is equipped with an air nozzle. Simultaneous inflation and deflation via the two air nozzles can accelerate the adjustment of the adhesive layer diameter.

[0015] Furthermore, the key bar is connected to a support block, which is attached to the end of the key bar opposite to the airbag. The support block is made of an elastic material. The support block can be made of an inexpensive rigid material, saving costs while facilitating connection to the airbag. Using a flexible, soft material for the support block prevents puncturing the rubber coating.

[0016] Furthermore, the support block and the key bar are detachably connected. The key bar includes a connecting seat fixedly connected to the airbag and a support bar connected to the connecting seat. The support bar extends toward a through hole opposite to the connecting seat. The end of the support bar away from the connecting seat is provided with a slot. The support block is provided with a buckle that cooperates with the slot.

[0017] Furthermore, along the length of the airbag, the spacing between each key strip is 0.5cm to 1.5cm. This 0.5cm to 1.5cm distance ensures the smoothness of the adhesive layer surface.

[0018] Furthermore, along the circumferential direction of the airbag, the spacing between each key strip is 1cm to 1.5cm. This 1cm to 1.5cm distance ensures the smoothness of the adhesive layer surface.

[0019] Furthermore, along the length of the airbag, the key strip located in the middle of the airbag is 2cm to 3cm longer than the key strip located at the ends of the airbag. Also, along the length of the airbag, the key strip smoothly transitions from the middle to both ends to ensure the smoothness of the adhesive layer surface.

[0020] Furthermore, the air nozzle is connected to a pressure regulating valve, which adjusts the diameter of the airbag to a preset value. The pressure regulating valve controls the air pressure inside the airbag; different air pressure values ​​represent different degrees of expansion of the airbag, i.e., different changes in the outer diameter of the rubber coating layer.

[0021] A coating machine using the flattening roller described above, the flattening roller being disposed at the outlet of the coating machine's oven. The flattening roller is disposed at the outlet of the coating machine's oven for flattening dried foil.

[0022] Based on the above technical solution, the beneficial effects of this utility model are as follows:

[0023] The flattening roller disclosed in this application is installed at the outlet of the oven of the coating machine to flatten the dried foil. The flattening roller has an inflatable or contractible air bladder inside. Along the length of the air bladder, there are key strips whose length decreases from the middle to both sides. The key strips respond to the expansion of the air bladder to support the coating layer, thereby changing the diameter of the coating layer. Since the length of the key strips decreases from the middle to both sides of the air bladder, the diameter of the coating layer also decreases from the middle to both ends. When using the flattening roller, the diameter of the flattening roller can be adjusted in real time according to the width of the blank in the middle of the electrode, the coating speed and drying conditions, so that the stress of the coated electrode is released to both sides, and the wrinkling phenomenon in the blank area in the middle is improved.

[0024] This application provides a pressure regulating valve inside the air nozzle of the support component. The pressure regulating valve can control the air pressure inside the airbag. Different air pressure values ​​represent different degrees of expansion of the airbag, that is, different changes in the outer diameter of the rubber layer.

[0025] To make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0027] Figure 1 This is an external view of the flattening roller in an embodiment of this utility model;

[0028] Figure 2 This is a schematic diagram of the structure of the roller body in an embodiment of this utility model;

[0029] Figure 3 This is a structural schematic diagram of the support member in an embodiment of this utility model;

[0030] Figure 4 This is a schematic diagram of the structure of the airbag and key strip in an embodiment of this utility model;

[0031] Figure 5 This is a schematic diagram of the key bar structure in an embodiment of this utility model;

[0032] Figure 6 This is a radial cross-sectional view of the flattening roller after expansion in an embodiment of this utility model;

[0033] Figure 7 This is a radial cross-sectional view of the flattening roller without expansion in an embodiment of this utility model.

[0034] The reference numerals in the above figures are as follows: 1. Roller body; 11. Through hole; 12. Support component; 121. Inflation channel; 122. Connecting groove; 2. Airbag; 21. Air nozzle; 22. Key bar; 221. Connecting seat; 222. Support bar; 223. Support block; 3. Rubber coating layer. Detailed Implementation

[0035] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] It should be noted that in the description of this utility model, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0037] Example: Combining Figure 1-7 As shown, Embodiment 1 discloses a flattening roller, comprising:

[0038] A roller body 1 extends along its length, and its surface is provided with a plurality of spaced through holes 11. In one feasible embodiment, the roller body is made of 45# steel, and the through holes 11 are arranged at equal intervals of fifteen in a row along the length of the roller body 1, and at equal intervals of eight rows along the circumference of the roller body 1.

[0039] Wherein, along the length direction of the roller body 1, the interval between each of the through holes 11 can be set to 0.5cm to 1.5cm, and along the circumferential direction of the roller body 1, the interval between each of the through holes 11 can be set to 1cm to 1.5cm.

[0040] In one feasible embodiment, the spacing between each of the through holes 11 is 1 cm along the length direction of the roller body 1, and the spacing between each of the through holes 11 is 1 cm along the circumferential direction of the roller body 1. These dimensions are compatible with most coating machine rollers on the market.

[0041] The roller body 1 has support members 12 connected to both ends. Each support member 12 includes a connecting portion passing through the roller body 1 and a supporting portion located outside the roller body 1. The support member 12 is provided with an air channel 121. The inlet of the air channel 121 is located on the supporting portion, and the outlet of the air channel 121 is located at the end of the connecting portion located inside the roller body 1. A connecting groove 122 is formed by recessing the end face of the outlet of the air channel 121 along its periphery.

[0042] An air bladder 2, made of rubber, is provided in the inner cavity of the roller body 1. The air bladder 2 is configured as a hollow tube extending along the length of the roller body 1, with both ends inserted into the connecting groove 122 to seal the ends of the air bladder 2 to the support member 12. The air bladder 2 can be inflated or deflated through the inflation channel 121.

[0043] An air nozzle 21 is provided inside the inlet of the inflation channel 121. The air nozzle 21 can be connected to an external air supply device to realize the automatic inflation and deflation of the airbag, thereby realizing the automatic expansion or contraction function of the airbag.

[0044] Optionally, of the two support members 12 at both ends of the roller body 1, only one support member 12 needs to be provided with the inflation channel 121. Inflation and deflation of the airbag 2 can also be achieved through a single inflation channel 121, and the manufacturing process of the support member 12 can be simplified.

[0045] The air nozzle 21 is connected to a pressure regulating valve, which can control the air pressure inside the airbag. Different air pressure values ​​represent different degrees of airbag inflation.

[0046] The surface of the airbag 2 is provided with a key strip 22 corresponding to the through hole 11. The key strip 22 can pass through the through hole 11 of the roller body 1 in response to the expansion of the airbag 2. Different degrees of expansion of the airbag correspond to different lengths of the key strip 22 extending through the through hole. Along the length direction of the airbag 2, the length of the key strip 22 decreases from the middle to both ends. It should be noted that, in this application, along the length direction of the airbag 2, the key strip 22 located in the middle of the airbag 2 is 2.2 cm longer than the key strip 22 located at the ends of the airbag 2. Furthermore, along the length direction of the airbag 2, the key strip 22 smoothly transitions from the middle to both ends.

[0047] Optionally, along the length of the airbag 2, the key strip 22 located in the middle of the airbag 2 can be 2cm to 3cm longer than the key strip 22 located at the end of the airbag 2.

[0048] The outer side of the roller body 1 is covered with a rubber coating layer 3, which is made of nitrile rubber and has elasticity. The two ends of the rubber coating layer 3 are respectively fixedly connected to the two support members 12.

[0049] Example 2 discloses a coating machine using the aforementioned flattening roller, which is installed at the outlet of the coating machine's oven to flatten the dried foil. Initially, the adhesive layer 3 is tightly attached to the roller body 1. When wrinkles are observed in the middle of the foil passing through the flattening roller, the air pressure entering the air bladder 2 is increased via the pressure regulating valve. The air bladder 2 gradually expands, and the key bar 22 extends out of the through-hole 11 of the roller body 1 and abuts against the adhesive layer 3. As the air bladder 2 expands, the radius of the adhesive layer 3 increases under the action of the key bar 22, releasing the stress of the coated foil to both sides, thereby improving the wrinkling phenomenon in the central blank area. It should be noted that since the key bar 22 located in the middle of the air bladder 2 is 2.2 cm longer than the key bar 22 located at the ends of the air bladder 2, the radius of the adhesive layer 3 after the diameter change decreases from the middle to both ends. Furthermore, since the spacing between each through hole 11 is 1cm along the length and circumference of the roller body 1, the 1cm spacing is sufficient to ensure the flatness of the surface of the coating layer 3.

[0050] Optionally, the key bar 22 is detachably connected to a support block 223, which is connected to the end of the key bar 22 facing away from the airbag 2 and is used to abut against the rubber coating layer 3. The support block 223 is made of soft rubber to avoid tearing the rubber coating layer 3 when it abuts against it.

[0051] In one feasible embodiment, the key bar 22 includes a connecting seat 221 fixedly connected to the airbag 2, and a support bar 222 connected to the connecting seat 221. The support bar 222 extends toward the through hole 11 opposite to the connecting seat 221. A slot is provided at one end of the support bar 222 away from the connecting seat 221, and the support block 223 is provided with a buckle that mates with the slot. Inserting the buckle into the slot fixes the support block 223 onto the support bar 222.

[0052] The above-described scheme involves placing the flattening roller at the outlet of the coating machine's oven to flatten the dried foil. The flattening roller contains an expandable or contractible air bladder 2. Along the length of the air bladder 2, key strips 22 are provided, their length decreasing from the center to both sides. These key strips 22 respond to the expansion or contraction of the air bladder 2, pressing against the coating layer 3 and thus changing the diameter of the coating layer 3. Because the length of the key strips 22 decreases from the center of the air bladder 2 to both sides, the diameter of the coating layer 3 also decreases from the center to both ends. The diameter of the flattening roller can be adjusted in real time according to the width of the blank area in the center of the electrode, the coating speed, and drying conditions, thereby releasing the stress of the coated electrode to both sides and improving the wrinkling phenomenon in the blank area.

[0053] This utility model uses specific embodiments to illustrate the principle and implementation of the utility model. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​the utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the utility model. Therefore, the content of this specification should not be construed as a limitation of the utility model.

Claims

1. A flattening roller characterized by, The utility model relates to a kind of flatting roller, including: Roller body, the roller body has inner cavity, the roller body surface is provided with spaced distribution through-hole; Air bag, the air bag is located in the inner cavity of the roller body; Rubber coating, the rubber coating is sleeved in the outer side of the roller body, the rubber coating has elasticity; Key strip, the key strip is spaced distribution on the surface of the air bag, the key strip can be responded to the expansion of the air bag, and pass through the through-hole of the roller body, and the rubber coating is abutted, to change the diameter of rubber coating.

2. The spreader bar of claim 1, wherein, The length of the key strip decreases from middle to both ends along the length direction of the air bag.

3. The spreader roller of claim 1 or 2, wherein The air bag is provided with inflation port, and the roller body is provided with at least one air nozzle communicated with the inflation port of the air bag.

4. The spreader bar of claim 1 or 2, wherein, The key strip is detachably connected with support block, the support block is located at one end of the key strip away from the air bag, and the support block is made of elastic material.

5. The spreader bar of claim 4, wherein, The interval between each key strip is 0.5cm-1.5cm along the length direction of the air bag. The interval between each key strip is 1cm-1.5cm along the circumferential direction of the air bag.

6. The spreader bar of claim 5, wherein, The key strip located in the middle of the air bag is 2cm-3cm longer than the key strip located at the end of the air bag along the length direction of the air bag.

7. The spreader bar of claim 4, wherein, The key strip includes connecting seat fixedly connected with the air bag, and support strip connected with the connecting seat, the support strip extends towards the through-hole opposite to the connecting seat, and the end of the support strip away from the connecting seat is provided with clamping groove. The support block is provided with buckle matched with the clamping groove.

8. The spreader bar of claim 3, wherein, Both ends of the air bag are through, and are respectively sealedly connected with both ends of the roller body, and both ends of the roller body are provided with the air nozzle.

9. The spreader bar of claim 8, wherein, The air nozzle is connected with pressure regulating valve, and under the action of the pressure regulating valve, the diameter of the air bag reaches preset value.

10. A coater using the spreader roll according to any one of claims 1 to 9, characterized by The flatting roller is arranged at the outlet of the oven of coating machine.

Images