Drying oven and drying oven system

Abstract

The utility model discloses a drying oven which is used for drying an electrode pole piece, the electrode pole piece comprises an active slurry area and a ceramic slurry area, the drying oven comprises an oven body and a drying assembly located in the oven body, and the drying assembly comprises a bearing table, an air supply pipeline and a heating device. By adopting the technical scheme, the curing process of the ceramic slurry can be accelerated, the curing speed of the ceramic slurry is improved, and the curing speed difference of the ceramic slurry and the active slurry is reduced, so that the curing speeds of the ceramic slurry and the active slurry tend to be consistent; therefore, the migration phenomenon caused by the fact that the drying speed of the ceramic slurry is slower than that of the active slurry is effectively reduced, the width of a ceramic material climbing area is reduced, and accurate measurement and size identification on the edge of the tab and normal exertion of the battery capacity by utilizing a CCD (Charge Coupled Device) technology in a subsequent laser cutting process are ensured. The utility model further discloses a drying oven system.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery technical field, concretely relates to a drying oven and a drying oven system. BACKGROUND

[0002] With the continuous development of batteries, its application scenarios are increasingly widespread, which puts higher requirements on the safety performance of batteries. However, in the actual production process, burrs, metal particles and beads may occur in the laser cutting process of the tab end. Once these burrs or metal foreign matter penetrates the diaphragm, it may cause the positive and negative electrodes to directly contact, thereby causing a short circuit of the battery. In order to reduce the risk of internal short circuit of the battery, a layer of insulating ceramic slurry is usually coated on the edge area of the current collector, i.e. the tab end, after the main material active slurry (hereinafter referred to as "active slurry") coating is completed in the coating process of the battery electrode sheet. The ceramic slurry can be located on one side of the active slurry or on both sides of the active slurry relative to the active slurry.

[0003] Since the solvents used for the active slurry and the ceramic slurry are the same (usually NMP), the two kinds of slurry are easy to be mutually soluble after contacting during the coating process. This mutual solubility can cause the two kinds of slurry to easily mix and form a mixed area (the transition area between the active slurry area and the ceramic slurry area, also known as the ceramic creep area) at the junction. On the one hand, the presence of the mixed area can affect the normal performance of the active slurry, resulting in a decrease in battery capacity, and the greater the width of the ceramic creep area, the more significant the impact. On the other hand, the presence of the mixed area can cause the black and white boundaries to be unclear, affecting the accurate measurement and size identification of the tab edge in the subsequent laser cutting process using CCD (Charge-Coupled Device) technology. SUMMARY

[0004] The utility model provides the following technical scheme to solve the above technical problem.

[0005] The utility model provides a drying oven for drying an electrode sheet, the electrode sheet comprising an active slurry area and a ceramic slurry area, the drying oven comprising a cabinet and a drying assembly located in the cabinet, the drying assembly comprising:

[0006] a carrying table for carrying the electrode sheet, the carrying table comprising a first area and a second area, wherein the first area is located on both sides of the second area, the ceramic slurry area is located in the first area, and the active slurry area is located in the second area;

[0007] an air supply pipeline for conveying hot air, the air supply pipeline being provided with a blowpipe, the blowpipe being oppositely arranged with the carrying table along the height direction of the drying oven, the blowpipe facing the carrying table and being used for conveying hot air to the first area and the second area;

[0008] A heating device is arranged opposite the first area along the height direction and faces the first area, and is used to heat the first area.

[0009] By using the above technical scheme, the solidification process of the ceramic slurry can be accelerated, the solidification speed of the ceramic slurry can be improved, the difference between the solidification speeds of the ceramic slurry and the active slurry can be reduced, and thus the solidification speeds of the ceramic slurry and the active slurry tend to be consistent, thereby effectively reducing the migration phenomenon caused by the fact that the ceramic slurry dries slower than the active slurry, reducing the width of the ceramic creep area, and further ensuring accurate measurement and size identification of the tab edge in the subsequent laser cutting process by using the CCD technology and normal performance of the battery capacity.

[0010] Optionally, the air supply pipeline includes a first air supply pipeline and a second air supply pipeline, the first air supply pipeline and the second air supply pipeline are arranged opposite along the height direction, the carrying table is located between the first air supply pipeline and the second air supply pipeline, the front surface of the electrode tab faces the first air supply pipeline, and the back surface of the electrode tab is exposed from the carrying table, the first air supply pipeline is used to dry the front surface of the electrode tab, and the second air supply pipeline is used to dry the back surface of the electrode tab.

[0011] Optionally, the carrying table is a transmission roller, the electrode tab enters and exits the box along the transmission direction of the transmission roller, the air supply pipeline extends along the transmission direction, and the heating device is arranged on the air supply pipeline and arranged opposite the air nozzle along the transmission direction.

[0012] Optionally, the air supply pipeline further has a sliding guide rail extending along a first direction, the first direction, the transmission direction and the height direction are perpendicular to each other, and the heating device is slidably arranged on the sliding guide rail and can slide along the first direction.

[0013] Optionally, the air nozzle is a plurality of air nozzles, the plurality of air nozzles are arranged along the first direction respectively, and the spacing between two adjacent air nozzles along the first direction is 30-50 cm.

[0014] Optionally, the air nozzle is further arranged along the transmission direction.

[0015] Optionally, the spacing between the heating device and the first area along the height direction is 10-15 cm.

[0016] Optionally, the oven further includes:

[0017] A telescopic fixing frame is located in the box and extends along the height direction, the telescopic fixing frame is arranged opposite the air supply pipeline along the height direction, the heating device is located at the top end of the telescopic fixing frame, and the telescopic fixing frame adjusts the spacing between the heating device and the first area along the height direction through telescopic movement.

[0018] Optionally, the heating device is a cluster heating device.

[0019] The utility model also provides a kind of oven system, the oven system includes multiple oven in any implementation mode above, wherein, multiple ovens are connected by transmission mode, electrode tab is sequentially dried by transmission through multiple ovens.

[0020] Adopt the above technical scheme, can ensure drying effect while significantly improving overall drying efficiency, shorten drying time. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It shows the development schematic diagram of electrode tab after drying in prior art;

[0022] Figure 2 It shows the distribution schematic diagram of ceramic slurry area, active slurry area and ceramic climbing area after drying of electrode tab in prior art;

[0023] Figure 3 It shows the structure schematic diagram of oven in one embodiment of the utility model;

[0024] Figure 4 It shows the side view of oven in another embodiment of the utility model;

[0025] Figure 5 It shows the front view of oven in another embodiment of the utility model;

[0026] Figure 6 It shows the development schematic diagram of electrode tab after drying in one embodiment of the utility model;

[0027] Figure 7 It shows the distribution schematic diagram of ceramic slurry area, active slurry area and ceramic climbing area after drying of electrode tab in one embodiment of the utility model.

[0028] (Symbol explanation)

[0029] 1-oven, 2-electrode tab, 2.1-the front of electrode tab, 3-active slurry area, 4-ceramic slurry area, 5-box, 6-drying assembly, 7-bearing table, 8-air supply duct, 8.1-first air supply duct, 8.2-second air supply duct, 9-air nozzle, 10-heating device, 11-sliding guide rail, 12-telescopic fixing frame, 13-ceramic climbing area, X-first direction, Y-transmission direction, Z-height direction. DETAILED DESCRIPTION

[0030] The following specific embodiments illustrate the embodiments of the present application, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure. Although the description of the present application will be introduced together with the preferred embodiments, it does not mean that the features of the present application are limited to the embodiments. On the contrary, the purpose of introducing the present application together with the embodiments is to cover other options or modifications that can be extended based on the claims of the present application. In order to provide a deep understanding of the present application, many specific details will be included in the following description. The present application can also be implemented without using these details. In addition, in order to avoid confusion or obscure the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0031] The terms "first", "second", and the like are only used to distinguish description, and cannot be understood as indicating or implying relative importance.

[0032] It should be noted that in the present specification, similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0033] In order to make the purpose, technical scheme and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0034] After completing the coating process of the battery pole piece, that is, after coating the ceramic slurry and the active slurry on the current collector, the electrode pole piece needs to be placed in an oven for drying to remove moisture. The drying method is usually hot air drying. Since the viscosities of the active slurry and the ceramic slurry are similar and the solid content of the active slurry (more than 60%) is much higher than the solid content of the ceramic slurry (about 30%), and the slurry with high solid content evaporates moisture faster during drying, which results in that the solidification speed of the active slurry is usually faster than that of the ceramic slurry during drying. Referring to Figures 1-2 This difference in solidification speed causes the active slurry 3 to pull and adsorb the ceramic slurry 4 when mutual solubility occurs, thereby causing the ceramic creep zone 13 to be formed at the junction of the two slurries and the width d1 of the ceramic creep zone 13 to be large, and further affecting the performance of the battery. Generally speaking, after drying is completed, the ceramic creep zone 13 of the electrode pole piece 2 will present a condition that the ceramic slurry 4 is located on the upper layer and the active slurry 3 is located on the lower layer. Since the ceramic slurry 4 is white and the active slurry 3 is black, the appearance of the ceramic creep zone 13 makes the black and white boundaries blurred, presenting a phenomenon that the black and white boundaries are not obvious, thereby affecting the accurate measurement and size identification of the edge of the tab using CCD technology in the subsequent laser cutting process. Based on this, the present application provides the following technical solutions to solve the above technical problems.

[0035] With reference to Figures 4-5 and in combination Figure 3 , the utility model provides a kind of oven 1, which is used for drying electrode sheet 2, electrode sheet 2 includes active slurry area 3 and ceramic slurry area 4.The oven 1 includes box 5 and drying assembly 6 located in box 5, and the drying assembly 6 includes:

[0036] Carrying table 7 is used to carry electrode sheet 2, and carrying table 7 includes first area (not shown in the figure) and second area (not shown in the figure), the first area is located on both sides of the second area relative to the second area, the ceramic slurry area 4 is located in the first area, and the active slurry area 3 is located in the second area.

[0037] Air supply duct 8 is used to transport hot air, and air supply duct 8 is provided with air nozzle 9, and air nozzle 9 is oppositely arranged with carrying table 7 along the height direction (for example Figures 3-5 Z direction) of oven 1.Air nozzle 9 faces carrying table 7, and air nozzle 9 transports hot air to the first area and the second area, so as to realize synchronous drying of the active slurry area 3 and the ceramic slurry area 4 on both sides thereof.

[0038] Heating device 10 is oppositely arranged with the first area along the height direction Z.Heating device 10 faces the first area and is used to heat the first area, that is, heating device 10 faces the ceramic slurry area 4 to additionally heat the ceramic slurry area 4.

[0039] By using the above technical scheme, the ceramic slurry 4 and the active slurry 3 in the electrode sheet 2 are comprehensively dried by hot air, and the heating device 10 is additionally arranged to specially heat the ceramic slurry area 4, so as to accelerate the solidification process of the ceramic slurry 4, improve the solidification speed of the ceramic slurry 4, reduce the difference between the solidification speeds of the ceramic slurry 4 and the active slurry 3, and make the solidification speeds of the ceramic slurry 4 and the active slurry 3 consistent, thereby effectively reducing the migration phenomenon caused by the slow drying speed of the ceramic slurry 4 compared with the active slurry 3, reducing the width of the ceramic creep area 13, and further ensuring accurate measurement and size identification of the tab edge by using CCD technology in the subsequent laser cutting process and normal performance of the battery capacity.

[0040] With reference to Figures 6-7 , after the electrode sheet 2 is dried by using the oven 1 provided by the utility model, the decomposition line between the ceramic slurry 4 and the active slurry 3 is clear, the width d2 of the ceramic creep area 13 is significantly reduced, and the appearance of the ceramic creep area 13 is almost completely avoided.

[0041] Further, with reference to Figures 4-5In the above embodiment, the air supply pipeline 8 includes a first air supply pipeline 8.1 and a second air supply pipeline 8.2. The first air supply pipeline 8.1 and the second air supply pipeline 8.2 are oppositely arranged along the height direction Z, the carrying table 7 is located between the first air supply pipeline 8.1 and the second air supply pipeline 8.2, the front surface 2.1 of the electrode tab 2 faces the first air supply pipeline 8.1, and the back surface of the electrode tab 2 is exposed from the carrying table 7. The first air supply pipeline 8.1 is used for drying the front surface 2.1 of the electrode tab 2, and the second air supply pipeline 8.2 is used for drying the back surface of the electrode tab 2.

[0042] By using the above technical scheme, the front surface 2.1 and the back surface of the electrode tab 2 are synchronously dried by the first air supply pipeline 8.1 and the second air supply pipeline 8.2 respectively. On the one hand, the double-sided air supply effectively offsets the air flow impact force generated by single-sided air supply, significantly reduces the shaking amplitude of the electrode tab 2, and thus ensures the stable operation of the drying process and the flatness of the electrode tab 2, thereby providing a better machining reference for subsequent processes (such as laser cutting, tab welding, etc.). On the other hand, the synchronous drying of the front and back surfaces can ensure the uniformity of the heating of the double-sided tab, and avoid the stress unevenness or deformation problem caused by single-sided drying.

[0043] Further, as shown in Figure 4 , in the above embodiment, the carrying table 7 is a transmission roller, and the electrode tab 2 enters the box body 5 along the transmission direction (for example, the Y direction in Figure 4 ) of the transmission roller. The air supply pipeline 8 extending along the transmission direction Y can continuously dry the electrode tab 2 entering the box body 5, and the dried electrode tab 2 exits the box body 5 along the transmission direction Y of the transmission roller 2, thereby realizing continuous production of the drying process. The heating device 10 is arranged on the air supply pipeline 8, and the heating device 10 and the air nozzle 9 are oppositely arranged along the transmission direction Y. By integrating the heating device 10 and the air nozzle 9 on the air supply pipeline 8 and oppositely arranging the heating device 10 and the air nozzle 9 along the transmission direction Y, on the one hand, along the transmission direction Y of the transmission roller, the air nozzle 9 can directly deliver hot air to the surface of the electrode tab 2, avoiding the hot air covering the heating device 10, thereby expanding the air supply coverage area and realizing efficient drying of the electrode tab 2. On the other hand, the heating device 10 and the air nozzle 9 are independently arranged, avoiding the interference of the heating device 10 with the air supply process of the air nozzle 9, thereby ensuring the stability and uniformity of the hot air delivery. Furthermore, the heating device 10 and the air nozzle 9 are integrated on the air supply pipeline 8, thereby optimizing the equipment layout and improving the space utilization.

[0044] Further, as shown in Figure 5 , the air supply pipeline 8, specifically the first air supply pipeline 8.1, is further provided with a sliding guide rail 11. The sliding guide rail 11 is arranged along the first direction (for example, the X direction in Figure 3 and Figure 5The first direction X, the transmission direction Y and the height direction Z are perpendicular to each other. The heating device 10 is slidably mounted on the sliding guide rail 11 and can slide along the first direction X. Through the sliding guide rail 11, the operator can quickly and accurately adjust the position of the heating device 10 according to the different width or layout of the ceramic slurry area 4, which not only can ensure the optimal heating effect, but also can adapt to the production demand of the electrode plate of various specifications and process requirements, and improve the versatility of the oven equipment.

[0045] Further, referring to Figure 4 and combining Figure 5 In the above embodiment, the plurality of tuyeres 9 are arranged along the first direction X, and the distance between two adjacent tuyeres 9 along the first direction X is 30-50 cm. By setting in this way, on the one hand, it can ensure that the hot air uniformly covers the surface of the electrode plate 2, avoiding the problem of uneven drying in local area. On the other hand, it avoids the airflow interference between the tuyeres 9, reduces the waste of hot air, improves the utilization rate of heat energy, thereby reducing the energy consumption and production cost.

[0046] Further, referring to Figure 4 and combining Figure 5 In the above embodiment, the plurality of tuyeres 9 are arranged along the first direction X, and the tuyeres 9 are also arranged along the transmission direction Y. In this way, it can ensure that the electrode plate 2 is always within the hot air coverage range during the conveying process, avoiding the problem of local overheating or insufficient drying during the drying process, ensuring that the drying effect of each area of the plate is consistent, thereby realizing continuous and uniform drying effect.

[0047] Further, in the above embodiment, the distance between the heating device 10 and the first area along the height direction Z is 10-15 cm. That is, the distance between the heating device 10 and the ceramic slurry area 4 along the height direction Z is 10-15 cm. Controlling the distance within this range can ensure that the heat generated by the heating device 10 is efficiently transferred to the ceramic slurry area 4, avoiding heat loss caused by too large distance, and preventing local overheating problem caused by too small distance.

[0048] Further, as Figure 3 shown, another embodiment of the utility model provides a drying oven 1 further comprising:

[0049] The telescopic fixing frame 12 is located in the box body 5, the telescopic fixing frame 12 extends along the height direction Z, the telescopic fixing frame 12 is opposite to the air supply pipeline 8 along the height direction Z, the heating device 10 is located at the top of the telescopic fixing frame 12, the telescopic fixing frame 12 adjusts the distance between the heating device 10 and the first area along the height direction Z through telescopic movement, that is, adjusts the distance between the heating device 10 and the ceramic slurry area 4 along the height direction Z. Through the telescopic function of the telescopic fixing frame 12, the operator can flexibly adjust the distance between the heating device 10 and the ceramic slurry area 4 according to the actual process requirements or the size of the oven 1, so as to ensure the optimal heating effect.

[0050] Further, in the above embodiment, the heating device 10 is a cluster heating device. The cluster heating device refers to a heating device that can concentrate heat on a specific area. The cluster heating device can concentrate heat on the ceramic slurry area 4, avoiding heat dispersion, thereby achieving efficient and precise heating of the ceramic slurry area 4.

[0051] The utility model also provides a kind of oven system, and the oven system includes multiple above-mentioned any implementation mode oven 1, wherein, multiple oven 1 is connected by transmission mode, electrode tab 2 is sequentially dried by transmission through multiple oven 1.

[0052] Using the above technical scheme, by connecting multiple ovens 1 together, electrode tab 2 can complete drying in stages, so that the drying effect can be ensured while the overall drying efficiency can be significantly improved, and the drying time can be shortened.

[0053] Although the utility model has been illustrated and described by referring to certain preferred embodiments of the utility model, it should be understood by those skilled in the art that the above content is further detailed description of the utility model combined with specific embodiments, and the specific implementation of the utility model cannot be limited to these descriptions. Those skilled in the art can make various changes in form and detail, including making several simple inferences or substitutions, without departing from the spirit and scope of the utility model.

Claims

1. An oven for drying an electrode web, the electrode web comprising an active paste region and a ceramic paste region, characterized in that, The oven comprises a box body and a drying assembly located in the box body, the drying assembly comprises: a bearing table for bearing the electrode tab, the bearing table comprises a first area and a second area, wherein the first area is located on both sides of the second area relative to the second area, the ceramic slurry area is located in the first area, and the active slurry area is located in the second area; an air supply pipeline for conveying hot air, the air supply pipeline is provided with a nozzle, the nozzle is oppositely arranged with the bearing table along the height direction of the oven, the nozzle faces the bearing table and is used for conveying the hot air to the first area and the second area; a heating device oppositely arranged with the first area along the height direction, facing the first area, and used for heating the first area.

2. Oven according to claim 1, characterized in that The air supply pipeline comprises a first air supply pipeline and a second air supply pipeline, the first air supply pipeline and the second air supply pipeline are oppositely arranged along the height direction, the bearing table is located between the first air supply pipeline and the second air supply pipeline, the front surface of the electrode tab faces the first air supply pipeline, and the back surface of the electrode tab is exposed from the bearing table, the first air supply pipeline is used for drying the front surface of the electrode tab, and the second air supply pipeline is used for drying the back surface of the electrode tab.

3. The oven according to claim 1, wherein the bearing table is a transmission roller, the electrode tab enters and exits the box body along the transmission direction of the transmission roller, the air supply pipeline extends along the transmission direction, the heating device is arranged on the air supply pipeline, and the heating device is oppositely arranged with the nozzle along the transmission direction.

4. Oven according to claim 3, characterized in that The air supply pipeline is further provided with a sliding guide rail extending along a first direction, the first direction, the transmission direction and the height direction are perpendicular to each other, and the heating device is slidably mounted on the sliding guide rail and can slide along the first direction.

5. Oven according to claim 4, characterized in that The nozzle is a plurality of nozzles, the plurality of nozzles are arranged along the first direction respectively, and the spacing between two adjacent nozzles along the first direction is 30-50 cm.

6. Oven according to claim 5, characterized in that The nozzle is further arranged along the transmission direction.

7. The oven of claim 1, wherein, The spacing between the heating device and the first area along the height direction is 10-15 cm.

8. The oven of claim 1, wherein, Further comprising: a telescopic fixing frame located in the box body, the telescopic fixing frame extending along the height direction, the telescopic fixing frame oppositely arranged with the air supply pipeline along the height direction, the heating device located at the top end of the telescopic fixing frame, and the telescopic fixing frame adjusting the spacing between the heating device and the first area along the height direction through telescopic movement.

9. Oven according to any of claims 1-8, characterized in that The heating device is a cluster heating device.

10. An oven system, characterized by A plurality of ovens according to any one of claims 1-9 are connected through transmission, and the electrode tab passes through the plurality of ovens in sequence through the transmission to complete drying.

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