Via roller and coating equipment

Abstract

The utility model provides a passing roller and coating equipment, and relates to the technical field of batteries. The passing roller comprises a roller body, a plurality of cooling grooves are formed in the peripheral wall of the roller body, the multiple cooling grooves are evenly distributed in the circumferential direction of the roller body, and the cooling grooves extend in the length direction of the roller body; an air outlet part penetrates through the bottom of the cooling groove, a cavity is formed in the roller body, the cavity is communicated with the cooling groove through the air outlet part, and air is introduced into the cavity and exhausted from the cooling groove through the air outlet part. When the passing roller is used, gas is introduced into the cavity, and the gas is discharged from the cooling groove through the gas outlet part. In the process, the gas flows along the cooling tank and actively takes away the heat of the pole piece covering the roller body, so that the cooling efficiency of the pole piece can be effectively improved, and the wrinkling of the pole piece caused by thermal expansion and cold contraction is reduced or even eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a roller and a coating device. Background Art

[0002] With the continuous development of power electrode technology, in order to achieve the purpose of cost reduction and efficiency improvement, the thickness of the current collector is continuously decreasing, and the problem of wrinkle formation of the electrode sheet has been restricting the improvement of the coating speed. Especially at the outlet of the oven, the electrode sheet is prone to wrinkle due to thermal expansion and contraction. Summary of the Utility Model

[0003] In order to solve the problem of wrinkle formation of the electrode sheet due to thermal expansion and contraction in the prior art, one of the purposes of the utility model is to provide a roller.

[0004] The utility model provides the following technical solutions:

[0005] A roller, comprising:

[0006] A roller body, on the outer peripheral wall of which a plurality of cooling grooves are provided, the plurality of cooling grooves are evenly distributed along the circumferential direction of the roller body, and the cooling grooves extend along the length direction of the roller body;

[0007] An air outlet part is penetrated through the bottom of the cooling groove, a cavity is arranged in the roller body, the cavity is communicated with the cooling groove through the air outlet part, and a gas is introduced into the cavity and discharged from the cooling groove through the air outlet part.

[0008] As a further optional scheme of the roller, the air outlet part is a plurality of through holes, and the plurality of through holes are arranged along the length direction of the roller body.

[0009] As a further optional scheme of the roller, the plurality of through holes include a plurality of first inclined holes and a plurality of second inclined holes, the plurality of first inclined holes are arranged along the length direction of the roller body from the center of the roller body to one end, the plurality of second inclined holes are arranged along the length direction of the roller body from the center of the roller body to the other end, the first inclined holes and the second inclined holes are respectively inclined relative to the axis of the roller body, and the inclination direction of the second inclined holes is opposite to the inclination direction of the first inclined holes.

[0010] As a further optional scheme of the roller, the included angle between the axis of the first inclined hole and the axis of the roller body is a first included angle, the included angle between the axis of the second inclined hole and the axis of the roller body is a second included angle, the sizes of the plurality of first included angles gradually decrease from the center of the roller body to the end, and the sizes of the plurality of second included angles gradually decrease from the center of the roller body to the end.

[0011] As a further optional solution for the above-mentioned over-roller, the magnitude of the first included angle is θ1, where 30° ≤ θ1 ≤ 70°; and / or

[0012] the magnitude of the second included angle is θ2, where 30° ≤ θ2 ≤ 70°.

[0013] As a further optional solution for the above-mentioned over-roller, the roller body has a first region, a second region, and a third region. The first region is used to support the pole piece. The second region is located at one end of the first region along the length direction of the roller body, and the third region is located at the other end of the first region along the length direction of the roller body;

[0014] A plurality of the first inclined holes are distributed in the first region and at least part of the second region, and a plurality of the second inclined holes are distributed in the first region and at least part of the third region.

[0015] As a further optional solution for the above-mentioned over-roller, the width of the notch of the cooling groove is greater than the width of the bottom of the cooling groove.

[0016] As a further optional solution for the above-mentioned over-roller, the over-roller further includes a connecting portion and an air inlet joint. The connecting portion is communicated with both ends of the roller body, the air inlet joint is communicated with the connecting portion, and the air inlet joint is used for introducing gas.

[0017] As a further optional solution for the above-mentioned over-roller, the width of the notch of the cooling groove is W, where 2 mm ≤ W ≤ 7 mm; and / or

[0018] the depth of the cooling groove is H, where 2 mm ≤ H ≤ 5 mm.

[0019] The purpose of the present utility model is to provide a coating device.

[0020] The present utility model provides the following technical solutions:

[0021] A coating device includes an oven and the above-mentioned over-roller, and the over-roller is arranged at the outlet of the oven.

[0022] The embodiments of the present utility model have the following beneficial effects:

[0023] When using the above-mentioned over-roller, gas is introduced into the cavity, and the gas is discharged from the cooling groove through the air outlet portion. During this process, the gas flows along the cooling groove, actively taking away the heat of the pole piece covering the roller body, which can effectively improve the cooling efficiency of the pole piece, thereby reducing or even eliminating the wrinkling of the pole piece caused by thermal expansion and contraction.

[0024] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following specific preferred embodiments are given below in conjunction with the accompanying drawings and are described in detail as follows. Brief Description of the Drawings

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 Fig. shows a schematic structural diagram of a coating device provided by an embodiment of the present invention;

[0027] Figure 2 Fig. shows a front view of a coating device provided by an embodiment of the present invention;

[0028] Figure 3 Fig. shows Figure 2 a schematic cross-sectional view taken along the C-C direction in;

[0029] Figure 4 Fig. shows Figure 3 an enlarged view at D in;

[0030] Figure 5 Fig. shows a top view of a coating device provided by an embodiment of the present invention;

[0031] Figure 6 Fig. shows Figure 5 an enlarged view at E in;

[0032] Figure 7 Fig. shows Figure 5 a schematic cross-sectional view taken along the F-F direction in;

[0033] Figure 8 Fig. shows Figure 7 an enlarged view at G in.

[0034] Main Element Symbol Description:

[0035] 10 - over-roller; 20 - bearing housing; 30 - bearing; 100 - roller body; 101 - first region; 102 - second region; 103 - third region; 110 - cooling tank; 120 - air outlet part; 121 - first inclined hole; 121a - first end; 121b - second end; 122 - second inclined hole; 130 - cavity; 200 - connecting part; 300 - air inlet joint; A - first included angle; B - second included angle. Detailed Embodiments

[0036] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as limiting the present utility model.

[0037] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. On the contrary, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0038] In the present utility model, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0039] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more unless otherwise clearly and specifically defined.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the specification of the template herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0041] In the related art, when the pole piece passes through the deviation rectification system out of the oven, an air knife and a passive exhaust roller are generally equipped to cool the pole piece and reduce the wrinkling phenomenon of the pole piece caused by thermal expansion and contraction. However, the passive exhaust roller only processes some exhaust channels on the traditional roller, and the heat dissipation method still relies on heat exchange with the surrounding environment, having the disadvantage of low heat dissipation efficiency and not significantly improving the wrinkling phenomenon of the pole piece.

[0042] In addition, after the pole piece exits the oven, it needs to pass through a set of rollers over a certain distance to fully cool the pole piece by extending the cooling time. This makes the distance between the oven and the subsequent mechanism long and the floor area of the coating equipment large.

[0043] Embodiment

[0044] This embodiment provides a roller 10, specifically an auxiliary flattening and rapid exhaust roller for coating.

[0045] Please refer to Figure 1 、 Figure 2 and Figure 3 simultaneously. The roller 10 includes a roller body 100. A plurality of cooling grooves 110 are provided on the outer peripheral wall of the roller body 100. The plurality of cooling grooves 110 are evenly distributed along the circumferential direction of the roller body 100, and each cooling groove 110 extends along the length direction of the roller body 100, which is indicated by the X direction in the figure.

[0046] In addition, an air outlet part 120 is provided through the bottom of the cooling groove 110, and a cavity 130 is provided inside the roller body 100. The cavity 130 is communicated with the cooling groove 110 through the air outlet part 120, and gas is introduced into the cavity 130 and discharged from the cooling groove 110 through the air outlet part 120.

[0047] When using the above-mentioned roller 10, gas is introduced into the cavity 130 and discharged from the cooling groove 110 through the air outlet part 120. During this process, the gas flows along the cooling groove 110, actively taking away the heat of the pole piece covering the roller body 100, which can effectively improve the cooling efficiency of the pole piece, thereby reducing or even eliminating the wrinkling of the pole piece caused by thermal expansion and contraction.

[0048] In the actual application process, an infrared sensor is used to measure the temperature of the pole piece. The temperature of the pole piece after exiting the oven is about 100°C. When using an air knife and a passive exhaust roller to cool the pole piece, the temperature of the cooled pole piece is between 50 - 60°C.

[0049] In contrast, when using the above-mentioned roller 10 to cool the pole piece, the temperature of the cooled pole piece can be reduced to between 30 - 40°C.

[0050] In some embodiments, the above-mentioned roller 10 further includes a connecting part 200 and an air inlet joint 300.

[0051] Among them, the connecting part 200 is communicated with both ends of the roller body 100. The air inlet joint 300 is communicated with the connecting part 200, and the air inlet joint 300 is used to introduce gas.

[0052] Specifically, there are two connecting parts 200 and intake connectors 300 respectively. One connecting part 200 is arranged at one end of the roller body 100 along the length direction, and communicates with one end of the roller body 100 along the length direction and one of the intake connectors 300 respectively. The other connecting part 200 is arranged at the other end of the roller body 100 along the length direction, and communicates with the other end of the roller body 100 along the length direction and the other intake connector 300 respectively.

[0053] During use, both ends of the roller body 100 are respectively communicated with the intake connector 300 through the connecting part 200, so as to introduce gas into the cavity 130. At the same time, the roller body 100 can also be rotatably connected with an external support structure through the connecting part 200.

[0054] Exemplarily, the intake connector 300 adopts a quick-insert type high-speed rotary joint. One end away from the connecting part 200 is a quick-insert end, which is connected to an external gas source (such as an air compressor or a workshop compressed gas pipeline) and controlled to start and stop through a pneumatic valve. It remains stationary during use, and one end close to the connecting part 200 rotates with the connecting part 200 and the roller body 100.

[0055] Please refer to Figure 4 , in some embodiments, the air outlet part 120 is a plurality of through holes, and the plurality of through holes are arranged along the length direction of the roller body 100.

[0056] Specifically, the through holes penetrate through the bottom of the cooling groove 110. One end of the through hole communicates with the cavity 130, and the other end of the through hole communicates with the cooling groove 110.

[0057] During use, an external gas source introduces gas into the intake connector 300. The gas flows into the connecting part 200 and the cavity 130 in sequence, and then flows into the cooling groove 110 through the through holes to cool the pole piece.

[0058] Please combine Figure 5 and Figure 6 , further, the plurality of through holes include a plurality of first inclined holes 121 and a plurality of second inclined holes 122.

[0059] Among them, the plurality of first inclined holes 121 are arranged along the length direction of the roller body 100 from the center of the roller body 100 to one end, and the plurality of second inclined holes 122 are arranged along the length direction of the roller body 100 from the center of the roller body 100 to the other end.

[0060] In addition, the first inclined holes 121 and the second inclined holes 122 are respectively inclined with respect to the axis of the roller body 100, and the inclination direction of the second inclined holes 122 is opposite to the inclination direction of the first inclined holes 121.

[0061] Taking the first inclined hole 121 as an example, it has a first end 121a communicating with the cavity 130 and a second end 121b communicating with the cooling groove 110, and the second end 121b is farther from the center of the roller body 100 than the first end 121a.

[0062] When the gas flows into the cooling groove 110 through the first inclined hole 121, the gas impacts obliquely on the pole piece with respect to the axis of the roller body 100. At this time, the impact force exerted by the gas on the pole piece is also inclined with respect to the axis of the roller body 100, and this impact force has a component force along the length direction of the roller body 100.

[0063] Since the second end 121b of the first inclined hole 121 is farther from the center of the roller body 100 than the first end 121a, the component force of this impact force points from the center of the roller body 100 to one end of the roller body 100 along the length direction.

[0064] Similarly, when the gas flows into the cooling groove 110 through the second inclined hole 122, it also impacts obliquely on the pole piece with respect to the axis of the roller body 100, and the component force of the impact force exerted by this part of the gas on the pole piece along the length direction of the roller body 100 points from the center of the roller body 100 to the other end of the roller body 100.

[0065] Thus, the impact force exerted by the gas on the pole piece has an outward pulling effect on the pole piece, which can flatten the tab.

[0066] Furthermore, the included angle between the axis of the first inclined hole 121 and the axis of the roller body 100 is the first included angle A, and the magnitudes of multiple first included angles A gradually decrease from the center of the roller body 100 to the end. The included angle between the axis of the second inclined hole 122 and the axis of the roller body 100 is the second included angle B, and the magnitudes of multiple second included angles B gradually decrease from the center of the roller body 100 to the end.

[0067] Taking the first inclined hole 121 as an example, the first included angle A of the first inclined hole 121 near the center of the roller body 100 is large, the effect of the air flow directly blowing on the pole piece is strong, and the cooling effect is better, but the outward pulling and flattening effect is poor. On the contrary, the first included angle A of the first inclined hole 121 near the end of the roller body 100 is small, the cooling effect is poor, but the outward pulling and flattening effect is better.

[0068] Since the tab is located at the edge of the pole piece, making the magnitudes of multiple first included angles A gradually decrease from the center of the roller body 100 to the end can flatten the tab to the greatest extent while ensuring the cooling effect.

[0069] In some embodiments, the magnitude of the first included angle A is θ1, satisfying 30° ≤ θ1 ≤ 70°.

[0070] Exemplarily, when the notch width of the cooling tank 110 is 7 mm and the depth of the cooling tank 110 is 5 mm, the first included angle A of each first inclined hole 121 on the same roller body 100 is kept consistent, and the first included angles A of the first inclined holes 121 on different roller bodies 100 are different. An infrared sensor is used to measure the temperature of the pole piece after passing through the roller body 100, and at the same time, the flattening effect on the pole ear is observed. The results are shown in Table 1.

[0071]

[0072]

[0073] As can be seen from Table 1, when the first included angle A is not less than 30° and not greater than 70°, the cooling effect and the external pulling and flattening effect can be taken into account, the temperature of the pole piece after cooling can be reduced to below 40 °C, and at the same time, the pole ear is flattened to ensure that there are no wrinkles on the pole ear.

[0074] In this embodiment, the first included angle A of the first inclined hole 121 near the center of the roller body 100 is 70°, and the magnitudes of the multiple first included angles A gradually decrease from the center of the roller body 100 to the end, and the first included angle A of the first inclined hole 121 near the end of the roller body 100 is 30°.

[0075] In some embodiments, the magnitude of the second included angle B is θ2, satisfying 30° ≤ θ2 ≤ 70°.

[0076] Similarly, when the second included angle B is not less than 30° and not greater than 70°, the cooling effect and the external pulling and flattening effect can be taken into account, the temperature of the pole piece after cooling can be reduced to below 40 °C, and at the same time, the pole ear is flattened to ensure that there are no wrinkles on the pole ear.

[0077] In this embodiment, the second included angle B of the second inclined hole 122 near the center of the roller body 100 is 70°, and the magnitudes of the multiple second included angles B gradually decrease from the center of the roller body 100 to the end, and the second included angle B of the second inclined hole 122 near the end of the roller body 100 is 30°.

[0078] Please refer to Figure 2 , in some embodiments, the roller body 100 has a first region 101, a second region 102, and a third region 103.

[0079] Among them, the first region 101 is located in the middle of the roller body 100 in the length direction and is used to support the pole piece. The second region 102 is located at one end of the first region 101 in the length direction of the roller body 100, and the third region 103 is located at the other end of the first region 101 in the length direction of the roller body 100. Along the length direction of the roller body 100, the second region 102, the first region 101, and the third region 103 are arranged in sequence.

[0080] Correspondingly, a plurality of first inclined holes 121 are distributed in the first region 101 and at least part of the second region 102, and a plurality of second inclined holes 122 are distributed in the first region 101 and at least part of the third region 103.

[0081] At this time, the distribution length of the first inclined holes 121 and the second inclined holes 122 along the length direction of the roller body 100 is greater than that of the processed pole piece and less than that of the entire roller body 100, ensuring sufficient cooling of the pole piece.

[0082] Please refer to Figure 7 and Figure 8 , in some embodiments, the width of the notch of the cooling groove 110 is greater than the width of the bottom of the cooling groove 110.

[0083] During use, the large width of the notch of the cooling groove 110 has an outward expansion effect on the gas, which can increase the contact area between the gas and the pole piece, thereby enhancing the cooling effect. At the same time, the small width of the bottom of the cooling groove 110 minimizes the impact on the strength of the roller body 100.

[0084] Exemplarily, the cross-section of the cooling groove 110 is trapezoidal.

[0085] In some embodiments, the width of the notch of the cooling groove 110 is W, satisfying 2 mm ≤ W ≤ 7 mm.

[0086] During use, the larger the width of the notch of the cooling groove 110, the smoother the gas flows along the cooling groove 110, and the better the cooling effect on the pole piece. However, when the width of the notch of the cooling groove 110 is too large, the cross-section of the roller body 100 is irregular, which easily causes imprints on the pole piece.

[0087] Conversely, the smaller the width of the notch of the cooling groove 110, the worse the cooling effect on the pole piece. At the same time, the cross-section of the roller body 100 is closer to a circle, and imprints are not easily formed on the pole piece.

[0088] In this embodiment, the width of the notch of the cooling groove 110 is 5 mm.

[0089] In another embodiment of the present application, the width of the notch of the cooling groove 110 is 7 mm.

[0090] In yet another embodiment of the present application, the width of the notch of the cooling groove 110 is 2 mm.

[0091] In some embodiments, the depth of the cooling groove 110 is H, satisfying 2 mm ≤ H ≤ 5 mm.

[0092] During use, the greater the depth of the cooling groove 110, the smoother the gas flow along the cooling groove 110, and the better the cooling effect on the electrode sheet. However, when the depth of the cooling groove 110 is too large, it will cause insufficient strength of the roller body 100, making it prone to damage and having a short service life.

[0093] Conversely, the smaller the depth of the cooling groove 110, the worse the cooling effect on the electrode sheet. At the same time, the roller body 100 has higher strength, is less likely to be damaged, and has a longer service life.

[0094] In this embodiment, the depth of the cooling groove 110 is 3.5 mm.

[0095] In another embodiment of the present application, the depth of the cooling groove 110 is 5 mm.

[0096] In yet another embodiment of the present application, the depth of the cooling groove 110 is 2 mm.

[0097] Exemplarily, when the first included angle A of the first inclined hole 121 and the second included angle B of the second inclined hole 122 are both 50°, the notch widths and depths of the cooling grooves 110 on different roller bodies 100 are made different. An infrared sensor is used to measure the temperature of the electrode sheet after passing through the roller body 100. At the same time, it is observed whether there are imprints on the electrode sheet, and the strength of the roller body 100 is measured. The results are shown in Table 2.

[0098]

[0099] As can be seen from Table 2, when the notch width of the cooling groove 110 is not less than 2 mm and not greater than 7 mm, and at the same time the depth of the cooling groove 110 is not less than 2 mm and not greater than 5 mm, it has a good cooling effect, can avoid imprints on the electrode sheet, and ensure that the roller body 100 has sufficient strength.

[0100] In summary, when using the above-mentioned over-roller 10, an external gas source introduces gas into the air inlet joint 300. The gas flows into the connecting part 200 and the cavity 130 in sequence, and then flows into the cooling groove 110 through the first inclined hole 121 and the second inclined hole 122 respectively, and finally discharges from the cooling groove 110. During this process, the gas flows along the cooling groove 110, actively taking away the heat of the electrode sheet covering the roller body 100, which can effectively improve the cooling efficiency of the electrode sheet, thereby reducing or even eliminating the wrinkling of the electrode sheet caused by thermal expansion and contraction.

[0101] In addition, when the gas flows into the cooling groove 110 through the first inclined hole 121 and the second inclined hole 122 respectively, the gas impacts obliquely on the electrode sheet with respect to the axis of the roller body 100. Therefore, the impact force exerted by the gas on the electrode sheet has an outward pulling effect on the electrode sheet, which can play a role in flattening the tab.

[0102] Please refer to Figure 1 、Figure 2 and Figure 3 Moreover, this embodiment further provides a coating device, including an oven and the above-mentioned over-roller 10, and the over-roller 10 is arranged at the outlet of the oven.

[0103] During use, the over-roller 10 is used to cool the electrode sheet after it exits the oven. Since the cooling efficiency of the electrode sheet is high, the distance between the oven and the subsequent mechanism can be reduced, making the overall coating device more compact, which is beneficial to saving the site cost.

[0104] In some embodiments, the above-mentioned coating device further includes a bearing seat 20 and a bearing 30.

[0105] Among them, the bearing seats 20 are arranged in pairs at both ends of the roller body 100 along the length direction, and the bearings 30 are arranged corresponding to the bearing seats 20. The connecting portion 200 is rotatably arranged on the bearing seat 20 through the bearing 30, so as to realize the rotational support of the roller body 100, enabling the roller body 100 to rotate along with the conveying of the electrode sheet.

[0106] In all the examples shown and described here, any specific value should be construed as merely exemplary, not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0107] It should be noted that: Similar reference numerals and letters denote similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0108] The above-described embodiments merely represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but should not be construed as a limitation on the scope of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A roller, characterized in that: include: A roller body (100), wherein the outer peripheral wall of the roller body (100) is provided with a plurality of cooling grooves (110), the plurality of cooling grooves (110) are evenly distributed along the circumference of the roller body (100), and the cooling grooves (110) extend along the length direction of the roller body (100); An air outlet (120) is provided through the bottom of the cooling groove (110), and a cavity (130) is provided in the roller body (100). The cavity (130) is connected to the cooling groove (110) through the air outlet (120), and gas is introduced into the cavity (130) and discharged from the cooling groove (110) through the air outlet (120).

2. The roller according to claim 1, characterized in that: The air outlet portion (120) is a plurality of through holes, and the plurality of through holes are arranged along the length direction of the roller body (100).

3. The roller according to claim 2, characterized in that: The plurality of through holes include a plurality of first inclined holes (121) and a plurality of second inclined holes (122); the plurality of first inclined holes (121) are arranged along the length direction of the roller body (100) from the center of the roller body (100) to one end; the plurality of second inclined holes (122) are arranged along the length direction of the roller body (100) from the center of the roller body (100) to the other end; the first inclined holes (121) and the second inclined holes (122) are respectively inclined relative to the axis of the roller body (100), and the inclination direction of the second inclined holes (122) is opposite to the inclination direction of the first inclined holes (121).

4. The roller according to claim 3, characterized in that: The angle between the axis of the first inclined hole (121) and the axis of the roller body (100) is a first angle (A), the angle between the axis of the second inclined hole (122) and the axis of the roller body (100) is a second angle (B), the sizes of the first angles (A) gradually decrease from the center of the roller body (100) to the end, and the sizes of the second angles (B) gradually decrease from the center of the roller body (100) to the end.

5. The roller according to claim 4, characterized in that: The magnitude of the first angle (A) is θ1, 30°≤θ1≤70°; and / or The magnitude of the second angle (B) is θ2, 30°≤θ2≤70°.

6. The roller according to claim 3, characterized in that: The roller body (100) comprises a first region (101), a second region (102) and a third region (103), the first region (101) being used to support the pole piece, the second region (102) being located at one end of the first region (101) along the length direction of the roller body (100), and the third region (103) being located at the other end of the first region (101) along the length direction of the roller body (100); A plurality of the first inclined holes (121) are distributed in the first region (101) and at least a portion of the second region (102), and a plurality of the second inclined holes (122) are distributed in the first region (101) and at least a portion of the third region (103).

7. The roller according to any one of claims 1 to 6, characterized in that: The width of the slot opening of the cooling slot (110) is greater than the width of the slot bottom of the cooling slot (110).

8. The roller according to any one of claims 1 to 6, characterized in that: The roller further comprises a connecting portion (200) and an air inlet joint (300), wherein the connecting portion (200) is in communication with two ends of the roller body (100), and the air inlet joint (300) is in communication with the connecting portion (200), and the air inlet joint (300) is used for introducing gas.

9. The roller according to claim 1, characterized in that: The slot width of the cooling slot (110) is W, 2mm≤W≤7mm; and / or The depth of the cooling groove (110) is H, 2mm≤H≤5mm.

10. A coating device, characterized in that: It comprises an oven and a roller (10) according to any one of claims 1 to 9, wherein the roller (10) is arranged at the outlet of the oven.

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