Baking equipment

Abstract

The invention discloses baking equipment which comprises a box body, a first heating piece, a first container and a pressing plate, and a baking cavity is formed in the box body; the first heating piece is arranged in the baking cavity; the first container is arranged in the baking cavity and is in contact with the first heating piece, and a first accommodating cavity is formed in the first container and is used for accommodating an electrode plate; the pressing plate is used for pressing the side, away from the first heating piece, of the electrode plate. The first container is in contact with the first heating piece, so that heat generated by the first heating piece can be transmitted to the electrode plate in a heat conduction mode, the electrode plate can be continuously and stably heated, the evaporation speed of a solvent on the surface of the electrode plate can be increased, and the drying efficiency of the electrode plate can be effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of electrode sheet drying, and in particular to a baking device. Background Art

[0002] During the manufacturing process of battery electrode sheets, if there is residual solvent on the electrode sheets, the solvent may react with the electrolyte to cause corrosion of the electrode sheets, or cause gas production and expansion inside the battery, affecting the reliability of the battery. Therefore, it is necessary to remove the residual solvent on the electrode sheets to improve the reliability of the battery.

[0003] Existing baking equipment uses hot air circulation to bake electrode sheets. However, the hot air circulation process is limited by the structural design of the baking equipment and is prone to instability problems such as air flow fluctuations. It is difficult to heat the electrode sheets stably, resulting in a limited drying speed of the electrode sheets, which affects the drying efficiency of the electrode sheets. Therefore, how to improve the drying efficiency of the electrode sheets is a technical problem that needs to be urgently solved in this field. Summary of the invention

[0004] In view of the above problems, the present application provides a baking device to improve the drying efficiency of electrode sheets.

[0005] The present application provides a baking device, which includes: a box body, which is formed with a baking cavity; a first heating element, which is arranged in the baking cavity; a first container, which is arranged in the baking cavity and is in contact with the first heating element, and the first container is formed with a first accommodating cavity, and the first accommodating cavity is used to accommodate an electrode sheet; and a pressing plate, which is used to press the electrode sheet on the side away from the first heating element. By arranging the first container and the first heating element in the baking cavity, and the first container is in contact with the first heating element, and the electrode sheet is arranged in the first accommodating cavity formed by the first container, and the pressing plate is pressed on the side of the electrode sheet away from the first heating element, on the one hand, by contacting the first container with the first heating element, the heat generated by the first heating element can be transferred to the electrode sheet in a heat conduction manner, so that the electrode sheet can be heated continuously and stably, which helps to accelerate the evaporation rate of the solvent on the surface of the electrode sheet, thereby effectively improving the drying efficiency of the electrode sheet; on the other hand, the first container can isolate the first heating element from direct contact with the electrode sheet, so that the heat generated by the first heating element cannot directly act on the electrode sheet, thereby reducing the aging of the electrode sheet caused by high temperature. On the third aspect, the first heating element may generate pollutants such as metal oxides or volatile organic compounds during long-term use. The first container can prevent the pollutants generated by the first heating element from contacting the electrode sheet, which can effectively improve the stability and reliability of the electrode sheet. In addition, the setting of the pressing plate enables the first heating element, the first container and the electrode sheet to be in better contact with each other, so that the heat generated by the first heating element can be quickly and evenly conducted to the electrode sheet through the first container, which can not only improve the heat conduction efficiency and reduce the heat loss in the conduction process, but also reduce the occurrence of problems such as local overheating or uneven heating of the electrode sheet, thereby significantly improving the drying efficiency and drying effect of the electrode sheet.

[0006] In some embodiments, the first heating element is located on one side of the first container along a first direction, and the first direction is configured as the stacking direction of the electrode sheets. In this way, the heat generated by the first heating element can be conducted to the electrode sheets layer by layer along the stacking direction of the electrode sheets, thereby improving the heat conduction efficiency, reducing the heat loss during the conduction process, effectively improving the drying efficiency of the electrode sheets, and reducing energy consumption.

[0007] In some embodiments, in the baking state, the first direction is the direction of gravity, and along the direction of gravity, the pressing plate, the electrode sheet, the bottom wall of the first container, and the first heating element are sequentially arranged in contact. With such an arrangement, on the one hand, under the action of gravity, the pressing plate can better squeeze the electrode sheet and the bottom wall of the first container, and can further improve the contact effect of the first heating element, the first container, and the electrode sheet, thereby further improving the heat conduction efficiency, and further improving the drying efficiency and drying effect of the electrode sheet; on the third hand, the pressing plate can provide uniform pressure for the electrode sheet, thereby reducing the risk of indentation on the electrode sheet or warping of the edge of the electrode sheet, and can effectively improve the consistency and reliability of the electrode sheet.

[0008] In some embodiments, the first container includes a first bottom plate, which is arranged as the bottom wall of the first container in contact with the first heating element; and the pressing plate is used to press the side of the electrode sheet facing away from the first bottom plate. In this way, the first bottom plate and the pressing plate can position the electrode sheet, which can reduce the risk of displacement or deformation of the electrode sheet due to heat or airflow during baking.

[0009] In some embodiments, the first container further comprises a first side plate, which is arranged around the outer edge of the first bottom plate to form a first accommodating cavity, and an opening connected to the first accommodating cavity is formed at one end of the first side plate away from the first bottom plate, and the pressing plate is arranged at the opening. By arranging the first side plate around the outer edge of the first bottom plate to form the first accommodating cavity, on the one hand, the first side plate can limit the electrode sheet arranged in the first accommodating cavity, further reducing the risk of displacement or deformation of the electrode sheet due to heat or airflow during baking, and improving the consistency and reliability of the electrode sheet; on the other hand, the first side plate can also guide the heat generated by the first heating element to be conducted from the first bottom plate along the stacking direction of the electrode sheet toward the direction away from the first heat conducting element, and limit the heat from diffusing outward in a direction perpendicular to the stacking direction of the electrode sheet to reduce heat loss, which can effectively improve the conduction efficiency and effective utilization rate of the heat generated by the first heating element, thereby effectively improving the drying efficiency of the electrode sheet and reducing the energy consumption of the baking equipment.

[0010] In some embodiments, the first side plate is provided with a first through hole connecting the baking chamber and the first accommodating chamber. With such a configuration, on the one hand, it is convenient for the water vapor in the first accommodating chamber to be discharged through the first through hole, reducing the risk of uneven drying of the electrode sheet due to the accumulation or condensation of water vapor in the first accommodating chamber; on the other hand, the configuration of the first through hole can balance the pressure difference between the baking chamber and the first accommodating chamber, reducing the risk of deformation or cracking of the first side plate and the electrode sheet due to the pressure difference.

[0011] In some embodiments, the box body is formed with a circulation channel, and the circulation channel, the baking chamber and the first accommodating chamber are connected in sequence; the baking equipment also includes: a second heating element, arranged in the circulation channel; a blowing assembly, arranged in the circulation channel, and the blowing assembly is used to drive the airflow in the circulation channel to flow into the first accommodating chamber through the baking chamber, and flow from the first accommodating chamber back to the circulation channel through the baking chamber. The airflow in the circulation channel is heated by the second heating element, and the airflow in the circulation channel is driven by the blowing assembly to flow into the first accommodating chamber through the baking chamber, and then flows back into the circulation channel from the first accommodating chamber through the baking chamber. On the one hand, the airflow can circulate along the circulation channel, the baking chamber and the first accommodating chamber, which is beneficial to reduce the temperature difference in the baking chamber, thereby improving the heating uniformity of the electrode sheet; on the other hand, the airflow can take away the water vapor near the electrode sheet during the circulation process, thereby reducing the risk of uneven drying of the electrode sheet due to the accumulation or condensation of water vapor near the electrode sheet; thirdly, the second heating element can not only provide a basic heat source for the circulation channel, but also supplement the temperature of the airflow flowing into the circulation channel from the baking chamber, so as to reduce the heat loss of the airflow during the circulation process, and evaporate the water vapor flowing into the circulation channel with the airflow, so as to reduce the water vapor content of the airflow flowing from the circulation channel into the baking chamber, which can effectively improve the drying efficiency and quality of the electrode sheet.

[0012] In some embodiments, the box body includes: an inner container, forming a baking cavity; an outer shell, which is sleeved outside the inner container and spaced apart from the inner container to form a circulation channel between the outer shell and the inner container; wherein the inner container is provided with a second through hole connecting the baking cavity and the circulation channel. With such a configuration, the blowing assembly can drive the airflow in the circulation channel to pass through the baking cavity and the first accommodating cavity in sequence, and flow back into the circulation channel to form an airflow circulation, which can not only reduce the temperature difference in the baking cavity and improve the heating uniformity of the electrode sheet, but also the airflow can take away the water vapor near the electrode sheet during the circulation process, which can reduce the risk of uneven drying of the electrode sheet due to the accumulation or condensation of water vapor near the electrode sheet.

[0013] In some embodiments, the circulation flow channel includes a first flow channel; the inner pot includes a first back plate, two second side plates arranged opposite to each other and two third side plates arranged opposite to each other, the two second side plates and the two third side plates are arranged on the same side of the first back plate, and are arranged around the outer edge of the first back plate to form a baking cavity; the second heating element is arranged on at least one of the two third side plates, and the two second side plates are provided with a second through hole; the two second side plates and the first back plate are spaced apart from the outer shell to form a first flow channel surrounding the two second side plates and the first back plate. With such a configuration, on the one hand, the air flow can flow from the first flow channel into the baking chamber and the first accommodating chamber through the second through hole on one of the two second side plates, and flow back to the first flow channel through the second through hole on the other of the two second side plates to form heat convection, so that the air flow can circulate stably and quickly, which can not only improve the heating speed and heating uniformity of the electrode sheet, but also reduce heat loss; on the other hand, by providing the second through hole on the second side plate where the second heating element is not provided, and providing the second heating element on the third side plate where the second through hole is not provided, not only can the phenomenon of uneven temperature distribution in the baking chamber caused by insufficient mixing of the air flow in the circulating flow channel be reduced, thereby improving the uniformity of temperature distribution in the baking chamber, but also the risk of water vapor flowing into the first flow channel through the second through hole directly contacting the second heating tube, thereby reducing oxidation or corrosion of the second heating tube by water vapor, which helps to extend the service life of the second heating tube.

[0014] In some embodiments, the circulation channel further includes a second channel, and the second heating element is disposed on a third side plate; the other third side plate is provided with a second through hole and is spaced apart from the outer shell to form a second channel on the side of the other third side plate facing away from the baking chamber, and the second channel is connected to the first channel. The second heating element can heat the airflow in the circulation channel, and the airflow heated by the second heating element diffuses and mixes toward the first channel and the second channel, which can improve the temperature uniformity of the airflow in the first channel and the second channel.

[0015] In some embodiments, the blowing assembly includes a magnetic flow blower, which can improve the sealing performance of the installation area of ​​the blowing assembly, reduce the impact of the installation of the blowing assembly on the temperature in the circulation channel, and help reduce heat loss in the circulation channel.

[0016] In some embodiments, the baking device further comprises a second container, which is disposed in the baking chamber and forms a second accommodating chamber, and the first heating element and the first container are both disposed in the second accommodating chamber. Such a configuration helps to increase the heating rate of the electrode sheet, and can reduce the heat loss generated by the first heating element, thereby improving the energy utilization rate.

[0017] In some embodiments, the second container includes: a second bottom plate, a first heating element is arranged on a side of the second bottom plate facing the second accommodating cavity; two fourth side plates arranged opposite to each other, connected to the outer edge of the second bottom plate to form the second accommodating cavity, and arranged on the same side as the second side plate, and the fourth side plate is provided with a third through hole connecting the baking cavity and the second accommodating cavity. By arranging the two fourth side plates arranged opposite to each other on the same side as the second side plate of the inner pot, and providing the third through hole on the fourth side plate, on the one hand, it is possible to promote airflow convection, so that the electrode sheet is heated more evenly; on the other hand, the fourth side plate can limit the first container arranged in the second accommodating cavity, reduce the risk of the first container shaking or falling during the installation or removal of the second container, thereby reducing the risk of deformation or damage of the electrode sheet, and improving the reliability of the electrode sheet.

[0018] In some embodiments, the baking device includes a plurality of second containers, each of which is provided with a plurality of first containers. This arrangement facilitates rapid loading or removal of the electrode sheet into the baking chamber, can improve the loading and removal efficiency of the electrode sheet, and helps to shorten the drying time of the electrode sheet.

[0019] In some embodiments, the baking device includes a plurality of boxes, the electrode sheets include positive electrode sheets and negative electrode sheets, a portion of the plurality of boxes is used to bake the positive electrode sheets, and another portion is used to bake the negative electrode sheets. By configuring the baking device to include a plurality of boxes, a portion of the plurality of boxes is used to bake the positive electrode sheets, and another portion is used to bake the negative electrode sheets, the risk of mixing up the positive electrode sheets and the negative electrode sheets is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings: Figure 1 It is a structural schematic diagram of an embodiment of a baking device provided by the present application; Figure 2 It is a schematic diagram of the exploded structure of the first container, the pressing plate and the electrode sheet of the baking equipment provided by the present application; Figure 3 is a structural schematic diagram of another embodiment of the baking equipment provided by the present application; Figure 4 It is a schematic diagram of the structure of the baking device provided in the present application after the shell is hidden.

[0021] The reference numerals in the specific implementation manner are as follows: Baking device 100, box body 10, baking chamber 101, circulation channel 102, first channel 102a, liner 11, second through hole 11a, first back plate 111, second side plate 112, third side plate 113, flange 114, shell 12, second back plate 121, reinforcing beam 13, first heating element 21, second heating element 22, first end 221, second end 222, blowing assembly 23, main body 231, rotating shaft 232, vacuum assembly 24, temperature sensor 25, first container 30, first accommodating chamber 30a, opening 30b, first bottom plate 31, first side plate 33, first through hole 33a, second container 40, second accommodating chamber 40a, second bottom plate 41, fourth side plate 42, third through hole 42a, panel 51, open portion 51a, door body 52, electrode sheet 200, pressing plate 60, handle 61. DETAILED DESCRIPTION

[0022] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0024] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0025] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0026] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0027] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0028] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate heat exchange medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0029] During the manufacturing process of the electrode sheet in the battery, the active material is usually first coated on the surface of the current collector of the electrode sheet by a coating equipment. The active material is usually a slurry. Since the slurry contains a solvent, the solvent will remain on the electrode sheet after the active material is coated. The solvent will react with the electrolyte to cause corrosion of the electrode sheet, or cause gas production and expansion inside the battery, affecting the reliability of the battery. Therefore, it is necessary to remove the residual solvent on the electrode sheet so that the active material can be tightly attached to the current collector to form a solid electrode structure to improve the reliability of the battery.

[0030] Existing baking equipment mainly uses hot air circulation to bake the electrode sheets. However, after the baking equipment is evacuated, the environment in the baking chamber approaches a vacuum state, which weakens the hot air circulation effect in the baking chamber, and further limits the evaporation rate of the solvent on the surface of the electrode sheet, affecting the drying efficiency of the electrode sheet.

[0031] Based on the above considerations, the present application provides a baking device. The baking device includes a box, a first heating element, a first container and a pressing plate, wherein the box forms a baking cavity; the first heating element is arranged in the baking cavity; the first container is arranged in the baking cavity and is arranged in contact with the first heating element, the first container forms a first accommodating cavity, and the first accommodating cavity is used to accommodate the electrode sheet; the pressing plate is used to be pressed on the side of the electrode sheet away from the first heating element. By arranging the first container and the first heating element in the baking cavity, and the first container is arranged in contact with the first heating element, and the electrode sheet is arranged in the first accommodating cavity formed by the first container, and the pressing plate is pressed on the side of the electrode sheet away from the first heating element, on the one hand, by contacting the first container with the first heating element, the heat generated by the first heating element can be transferred to the electrode sheet in a heat conduction manner, so that the electrode sheet can be heated continuously and stably, which helps to accelerate the evaporation rate of the solvent on the surface of the electrode sheet, thereby effectively improving the drying efficiency of the electrode sheet; on the other hand, the first container can isolate the first heating element from direct contact with the electrode sheet, so that the heat generated by the first heating element cannot directly act on the electrode sheet, thereby reducing the aging of the electrode sheet caused by high temperature. On the third aspect, the first heating element may generate pollutants such as metal oxides or volatile organic compounds during long-term use. The first container can prevent the pollutants generated by the first heating element from contacting the electrode sheet, which can effectively improve the stability and reliability of the electrode sheet. In addition, the setting of the pressing plate enables the first heating element, the first container and the electrode sheet to be in better contact with each other, so that the heat generated by the first heating element can be quickly and evenly conducted to the electrode sheet through the first container, which can not only improve the heat conduction efficiency and reduce the heat loss in the conduction process, but also reduce the occurrence of problems such as local overheating or uneven heating of the electrode sheet, thereby significantly improving the drying efficiency and drying effect of the electrode sheet.

[0032] The baking equipment of the embodiment of the present application can be used to bake electrode sheets during the production process of batteries, and can at least increase the evaporation rate of the solvent on the surface of the electrode sheets after vacuuming to improve the drying efficiency of the electrode sheets, thereby improving the reliability of the battery.

[0033] The electrode sheets dried by the baking equipment disclosed in the embodiment of the present application can be used in batteries, and the batteries can be used in electrical equipment that uses the batteries as power sources or various energy storage systems that use the batteries as energy storage elements. Electrical equipment can be, but is not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, and the like. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like, and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0034] For the convenience of description, the following embodiments are described by taking a baking device according to an embodiment of the present application as an example.

[0035] Please refer to Figure 1 to Figure 2 The present application provides a baking device 100, which includes a box body 10, a first heating element 21, a first container 30 and a pressing plate 60. The box body 10 forms a baking cavity 101; the first heating element 21 is arranged in the baking cavity 101; the first container 30 is arranged in the baking cavity 101 and is arranged in contact with the first heating element 21. The first container 30 forms a first accommodating cavity 30a, and the first accommodating cavity 30a is used to accommodate the electrode sheet 200; the pressing plate 60 is used to press the side of the electrode sheet 200 away from the first heating element 21.

[0036] A relatively closed baking chamber 101 is formed inside the box body 10, the first container 30 and the first heating element 21 are both arranged in the baking chamber 101, and the outer surface of the first container 30 is arranged in contact with the first heating element 21, and the electrode sheet 200 is arranged in the first accommodating chamber 30a formed by the first container 30, and the first container 30 can conduct the heat of the first heating element 21 to the electrode sheet 200.

[0037] The first heating element 21 may be disposed in contact with the bottom wall of the first container 30 ; of course, the first heating element 21 may also be disposed in contact with the side wall of the first container 30 .

[0038] The first heating element 21 may be a heating tube. The heating tube may be a straight heating tube, a U-shaped heating tube, a W-shaped heating tube or a special-shaped heating tube according to the shape, but not limited thereto. The heating tube may be a stainless steel heating tube, a quartz heating tube, a halogen heating tube or a carbon fiber heating tube according to the material, but not limited thereto.

[0039] The first container 30 can be in direct contact with the first heating element 21 to reduce heat loss and shorten the time for heat to be conducted to the electrode sheet 200. Of course, a heat conductive member can also be provided on the side of the first container 30 facing the first heating element 21, and the first container 30 is closely attached to the first heating element 21 through the heat conductive member; and / or, a heat conductive member is provided on the side of the first container 30 facing away from the first heating element 21, and the first container 30 is closely attached to the electrode sheet 200 through the heat conductive member, so that the heat generated by the first heating element 21 can be evenly and quickly conducted to the electrode sheet 200. Among them, the heat conductive member can be a heat conductive silicone pad, heat conductive silicone grease, heat conductive gel or carbon fiber heat conductive pad, etc., but is not limited thereto.

[0040] The first container 30 may be made of a material with high thermal conductivity, such as pure aluminum, aluminum alloy, stainless steel, etc., but is not limited thereto.

[0041] The pressing plate 60 is used to apply pressure to the electrode sheet 200 and the first container 30, which can reduce the gap between the first heating element 21 and the first container 30 and between the first container 30 and the electrode sheet 200, so that the first heating element 21, the first container 30 and the electrode sheet 200 can be in better contact.

[0042] By arranging the first container 30 and the first heating element 21 in the baking chamber 101, and the first container 30 is arranged in contact with the first heating element 21, and the electrode sheet 200 is arranged in the first accommodating chamber 30a formed by the first container 30, and the pressing plate 60 is pressed on the side of the electrode sheet 200 away from the first heating element 21, on the one hand, by making the first container 30 contact with the first heating element 21, the heat generated by the first heating element 21 can be transferred to the electrode sheet 200 in a heat conduction manner, so that the electrode sheet 200 can be heated continuously and stably, which helps to accelerate the evaporation rate of the solvent on the surface of the electrode sheet 200, thereby effectively improving the drying efficiency of the electrode sheet 200; on the other hand, the first container 30 can isolate the first heating element 21 from direct contact with the electrode sheet 200, so that the heat generated by the first heating element 21 cannot directly act on the electrode sheet 200, thereby reducing the The temperature may cause the electrode sheet 200 to age or the active material on the surface of the electrode sheet 200 to be damaged; thirdly, the first heating element 21 may generate pollutants such as metal oxides or volatile organic compounds during long-term use. The first container 30 can prevent the pollutants generated by the first heating element 21 from contacting the electrode sheet 200, which can effectively improve the stability and reliability of the electrode sheet 200; and, the setting of the pressing plate 60 enables the first heating element 21, the first container 30 and the electrode sheet 200 to be in better contact, so that the heat generated by the first heating element 21 can be quickly and evenly conducted to the electrode sheet 200 through the first container 30, which can not only improve the heat conduction efficiency and reduce the heat loss in the conduction process, but also reduce the occurrence of local overheating or uneven heating of the electrode sheet 200, thereby significantly improving the drying efficiency and drying effect of the electrode sheet 200.

[0043] In some embodiments, please refer to Figure 1 to Figure 2 The first heating element 21 is located at one side of the first container 30 along the first direction XX, and the first direction XX is configured as the stacking direction of the electrode sheets 200 .

[0044] The first accommodating cavity 30a formed by the first container 30 can accommodate a plurality of electrode sheets 200, and the plurality of electrode sheets 200 are stacked in the first accommodating cavity 30a along the first direction XX. If the first direction XX is parallel to the arrangement direction of the top and bottom of the baking device 100, the first heating element 21 is arranged in contact with the bottom wall of the first container 30, and the pressing plate 60 is pressed on the side of the electrode sheet 200 away from the bottom wall of the first container 30. If the first direction XX is perpendicular to the arrangement direction of the top and bottom of the baking device 100, the first heating element 21 is arranged in contact with the side wall of the first container 30, and the pressing plate 60 is pressed on the side of the electrode sheet 200 away from the side wall of the first container 30.

[0045] Among the multiple electrode sheets 200 arranged in the first accommodating cavity 30a, the electrode sheet 200 closest to the first heating element 21 is tightly fitted to the side of the first container 30 along the first direction XX facing away from the first heating element 21, so that the heat generated by the first heating element 21 can be quickly conducted through the first container 30 to the electrode sheet 200 closest to the first heating element 21, and conducted to the electrode sheets 200 layer by layer along the stacking direction of the electrode sheets 200.

[0046] By arranging the first heating element 21 on one side of the first container 30 along the first direction XX, and the first direction XX is configured as the stacking direction of the electrode sheet 200, the heat generated by the first heating element 21 can be conducted to the electrode sheet 200 layer by layer along the stacking direction of the electrode sheet 200, thereby improving the heat conduction efficiency, reducing the heat loss in the conduction process, effectively improving the drying efficiency of the electrode sheet 200, and reducing energy consumption.

[0047] In some embodiments, please refer to Figure 1 to Figure 2 In the baking state, the first direction XX is the gravity direction, and along the gravity direction, the pressing plate 60, the electrode sheet 200, the bottom wall of the first container 30 and the first heating element 21 are contacted and arranged in sequence.

[0048] The first heating element 21 is disposed on the side of the bottom wall of the first container 30 facing away from the first accommodating cavity 30a, the electrode sheets 200 disposed in the first accommodating cavity 30a are stacked along the gravity direction, and the pressing plate 60 is pressed on the upper part of the electrode sheets 200 along the gravity direction. The pressing plate 60, the electrode sheets 200, the bottom wall of the first container 30 and the first heating element 21 are sequentially contacted and disposed along the gravity direction, and the heat generated by the first heating element 21 can be conducted to the electrode sheets 200 through the bottom wall of the first container 30.

[0049] Among them, the electrode sheet 200 is placed on the bottom wall of the first container 30, which can improve the stability of the placement of the electrode sheet 200. Since the pressure plate 60 is pressed on the electrode sheet 200 along the direction of gravity, the electrode sheet 200 will not become scattered due to factors such as thermal expansion during the baking process, which can further improve the contact effect among the first heating element 21, the first container 30 and the electrode sheet 200.

[0050] By making the pressing plate 60, the electrode sheet 200, the bottom wall of the first container 30 and the first heating element 21 contact with each other in sequence along the direction of gravity, on the one hand, the electrode sheets 200 stacked along the direction of gravity can be baked by utilizing the natural rising characteristics of the hot air flow, which can not only improve the heat conduction efficiency and save the heat conduction time, but also enhance the uniformity of heat distribution; on the other hand, under the action of gravity, the pressing plate 60 can better squeeze the electrode sheet 200 and the bottom wall of the first container 30, which can further improve the contact effect of the first heating element 21, the first container 30 and the electrode sheet 200, thereby further improving the heat conduction efficiency, and then improving the drying efficiency and drying effect of the electrode sheet 200; thirdly, the pressing plate 60 can provide uniform pressure for the electrode sheet 200, thereby reducing the risk of indentation on the electrode sheet 200 or warping of the edge of the electrode sheet 200, and can effectively improve the consistency and reliability of the electrode sheet 200.

[0051] In some embodiments, please refer to Figure 2 The first container 30 includes a first bottom plate 31, and the first bottom plate 31 is disposed as a bottom wall of the first container 30 in contact with the first heating element 21. The pressing plate 60 is used to press the electrode sheet 200 on a side facing away from the first bottom plate 31.

[0052] The electrode sheet 200 is disposed between the first bottom plate 31 and the pressing plate 60 . The first bottom plate 31 and the pressing plate 60 can position the electrode sheet 200 , thereby reducing the risk of displacement or deformation of the electrode sheet 200 due to heat or airflow during baking.

[0053] In some embodiments, the surface of the pressing plate 60 facing the electrode sheet 200 may be a flat and smooth plane, and the area of ​​the surface of the pressing plate 60 facing the electrode sheet 200 may be greater than or equal to the area of ​​the electrode sheet 200, so that the pressing plate 60 can provide uniform pressure to the electrode sheet 200, thereby further reducing the risk of indentation of the electrode sheet 200 or warping of the edge of the electrode sheet 200. The surface of the first bottom plate 31 facing the electrode sheet 200 is also a flat and smooth plane to reduce the risk of indentation of the electrode sheet 200.

[0054] In some embodiments, a handle 61 is provided on the side of the pressing plate 60 facing away from the electrode sheet 200. The handle 61 is provided to facilitate lifting the pressing plate 60, thereby improving the efficiency of installing and removing the pressing plate 60.

[0055] In some embodiments, please refer to Figure 1 to Figure 2 The first container 30 further includes a first side plate 33, which is arranged around the outer edge of the first bottom plate 31 to form a first accommodating cavity 30a. An opening 30b communicating with the first accommodating cavity 30a is formed at one end of the first side plate 33 away from the first bottom plate 31. The pressing plate 60 is arranged at the opening 30b.

[0056] The first side plate 33 surrounds the outer edge of the first bottom plate 31 and extends in a direction away from the first heating element 21 to form a first accommodating cavity 30a. The first side plate 33 can not only limit the electrode sheet 200 disposed in the first accommodating cavity 30a, but also guide the heat generated by the first heating element 21 from the first bottom plate 31 along the stacking direction of the electrode sheet 200 toward a direction away from the first heat conducting element.

[0057] By arranging the first side plate 33 around the outer edge of the first bottom plate 31 to form the first accommodating cavity 30a, on the one hand, the first side plate 33 can limit the electrode sheet 200 arranged in the first accommodating cavity 30a, further reducing the risk of displacement or deformation of the electrode sheet 200 due to heat or airflow during baking, and improving the consistency and reliability of the electrode sheet 200; on the other hand, the first side plate 33 can also guide the heat generated by the first heating element 21 to be conducted from the first bottom plate 31 along the stacking direction of the electrode sheet 200 toward the direction away from the first heat conducting element, and limit the heat from diffusing outward in a direction perpendicular to the stacking direction of the electrode sheet 200 to reduce heat loss, which can effectively improve the conduction efficiency and effective utilization rate of the heat generated by the first heating element 21, thereby effectively improving the drying efficiency of the electrode sheet 200 and reducing the energy consumption of the baking equipment 100.

[0058] The first container 30 may be a split structure, that is, the first bottom plate 31 and the first side plate 33 may be independent components, and the first bottom plate 31 and the first side plate 33 are combined into one by a fixed connection, wherein the fixed connection method may be welding, rivet connection or bolt connection, etc., but not limited thereto. The first container 30 may also be an integrally formed structure, that is, the first bottom plate 31 and the first side plate 33 are integrally formed, and the integral forming method may be stamping and milling, etc., but not limited thereto. By integrally forming the first bottom plate 31 and the first side plate 33, the number of parts and the assembly process can be reduced, thereby saving assembly time, and improving the production efficiency of the first container 30.

[0059] In some embodiments, the side of the electrode sheet 200 facing away from the first bottom plate 31 is flush with the edge of the opening 30b, the pressing plate 60 is arranged at the opening 30b, and the side of the pressing plate 60 facing the first accommodating cavity 30a is in contact with the electrode sheet 200; alternatively, the side of the electrode sheet 200 facing away from the first bottom plate 31 may also be lower than the edge of the opening 30b, the pressing plate 60 at least partially extends into the first accommodating cavity 30a through the opening 30b, and the side of the pressing plate 60 close to the first bottom plate 31 is in contact with the electrode sheet 200.

[0060] In some embodiments, the outer edge of the pressing plate 60 may be spaced apart from the side of the first side plate 33 facing the first accommodating cavity 30a, so that a gap is formed between the pressing plate 60 and the first side plate 33, so as to reserve thermal expansion space for the pressing plate 60, and reduce the risk of interference between the pressing plate 60 and the first side plate 33 when the pressing plate 60 is heated and expanded. The vertical distance between the outer edge of the pressing plate 60 and the first side plate 33 may be 1.5 mm-3 mm, for example, the vertical distance between the outer edge of the pressing plate 60 and the first side plate 33 may be 1.5 mm, 1.7 mm, 1.88 mm, 2 mm, 2.2 mm, 2.55 mm, 2.6 mm, 2.75 mm, 2.9 mm, 3 mm, etc., but is not limited thereto.

[0061] In some embodiments, please refer to Figure 3 The baking device 100 further includes a vacuum pumping component 24, which is disposed on the housing 10 and communicates with the baking chamber 101. The vacuum pumping component 24 is used to extract the gas in the baking chamber 101 after the electrode sheet 200 is heated to a set temperature, so as to reduce the air pressure in the baking chamber 101, so as to reduce the boiling point of the solvent on the surface of the electrode sheet 200, thereby not only accelerating the evaporation rate of the solvent on the surface of the electrode sheet 200, but also reducing the risk of thermal damage to the active material of the electrode sheet 200. The first heating element 21 can be used to supplement the temperature of the electrode sheet 200 after vacuuming to maintain the heat on the surface of the electrode sheet 200, thereby not only improving the drying efficiency of the electrode sheet 200, but also reducing the risk of uneven distribution of the binder in the active material or uneven shrinkage of the electrode sheet 200, which is beneficial to improving the reliability of the battery.

[0062] In some embodiments, please refer to Figure 2 The first side plate 33 is provided with a first through hole 33a connecting the baking cavity 101 and the first accommodating cavity 30a.

[0063] There are multiple first through holes 33 a , and the multiple first through holes 33 a may be evenly distributed on the first side plate 33 , or the multiple first through holes 33 a may be unevenly distributed on the first side plate 33 .

[0064] In some embodiments, the first side panel 33 may include two first sub-side panels and two second sub-side panels that are arranged opposite to each other. The two first sub-side panels and the two second sub-side panels are arranged on the same side of the first bottom panel 31, and are arranged around the outer edge of the first bottom panel 31 to form a first accommodating cavity 30a. The two first sub-side panels and the two second sub-side panels are both provided with a first through hole 33a; or, only the first sub-side panel is provided with a first through hole 33a; or, only the second sub-side panel is provided with a first through hole 33a. The specific setting position of the first through hole 33a can be selected according to the hot air circulation path in the baking cavity 101.

[0065] The first through hole 33 a may be formed on the first side plate 33 by punching, laser cutting, electric spark drilling, water jet drilling, milling drilling, etc., but is not limited thereto.

[0066] By setting a first through hole 33a connecting the baking chamber 101 and the first accommodating chamber 30a on the first side plate 33, on the one hand, it is convenient for the water vapor in the first accommodating chamber 30a to be discharged through the first through hole 33a, thereby reducing the risk of uneven drying of the electrode sheet 200 due to the accumulation or condensation of water vapor in the first accommodating chamber 30a; on the other hand, the setting of the first through hole 33a can balance the pressure difference between the baking chamber 101 and the first accommodating chamber 30a, thereby reducing the risk of deformation or cracking of the first side plate 33 and the electrode sheet 200 due to the pressure difference.

[0067] In some embodiments, please refer to Figure 3 , the housing 10 is formed with a circulation channel 102. The circulation channel 102, the baking chamber 101 and the first accommodating chamber 30a are connected in sequence. The baking device 100 also includes a second heating element 22 and a blowing assembly 23. The second heating element 22 is arranged in the circulation channel 102. The blowing assembly 23 is arranged in the circulation channel 102. The blowing assembly 23 is used to drive the airflow in the circulation channel 102 to flow into the first accommodating chamber 30a via the baking chamber 101, and flow back from the first accommodating chamber 30a to the circulation channel 102 via the baking chamber 101.

[0068] The second heating element 22 may be a heating tube. The heating tube may be a straight heating tube, a U-shaped heating tube, a W-shaped heating tube or a special-shaped heating tube according to the shape, but not limited thereto. The heating tube may be a stainless steel heating tube, a quartz heating tube, a halogen heating tube or a carbon fiber heating tube according to the material, but not limited thereto.

[0069] In some embodiments, the blowing assembly 23 includes a main body 231, a rotating shaft 232, and a driving component. The main body 231 is located in the circulation channel 102, and the rotating shaft 232 is connected to the main body 231 and extends outside the circulation channel 102 to connect with the driving component (not shown). The driving component drives the main body 231 to rotate through the rotating shaft 232. The main body 231 has fan blades, which can drive the airflow in the circulation channel 102 to flow into the first accommodating chamber 30a through the baking chamber 101, and flow from the first accommodating chamber 30a back to the circulation channel 102 through the baking chamber 101.

[0070] The circulation channel 102, the baking chamber 101 and the first accommodating chamber 30a are connected in sequence to form a circulation airflow path. The blowing assembly 23 and the second heating element 22 are both arranged in the circulation channel 102, and the second heating element 22 is used to heat the airflow in the circulation channel 102. The blowing assembly 23 can drive the airflow in the circulation channel 102 and heated by the second heating assembly to flow into the baking chamber 101, and flow into the first accommodating chamber 30a through the first through hole 33a on the first side plate 33 of the first container 30, so as to bake the electrode sheet 200 in the first accommodating chamber 30a through thermal convection; the blowing assembly 23 can also drive the airflow and the water vapor formed after baking the electrode sheet 200 to flow into the circulation channel 102 through the first through hole 33a and the baking chamber 101, and the second heating element 22 can heat and evaporate the water vapor flowing into the circulation channel 102, so that the water vapor evaporates to form an airflow and enters the next cycle, thereby heating the electrode sheet 200 through circulation convection.

[0071] In some embodiments, the heating mode in which the first heating element 21 performs heat conduction heating on the electrode sheet 200 is defined as the first heating mode; the heating mode in which the second heating element 22 and the blowing assembly 23 perform cyclic convection heating on the electrode sheet 200 is defined as the second heating mode. In the early stage of the baking device 100, the first heating element 21, the second heating element 22 and the blowing assembly 23 can be started at the same time, so as to bake the electrode sheet 200 at the same time through the first heating mode and the second heating mode, wherein the first heating mode directly conducts the heat of the first heating element 21 to the electrode sheet 200 through the first container 30, and can quickly conduct heat to the electrode sheet 200, and the second heating mode can make the airflow circulate along the circulation channel 102, the baking chamber 101 and the first accommodating chamber 30a, which can not only reduce the temperature difference in the baking chamber 101, but also take away the water vapor near the electrode sheet 200, and the electrode sheet 200 can be baked at the same time through the first heating mode and the second heating mode, so that the electrode sheet 200 can be quickly heated to the set temperature and the baking time can be shortened. After the baking equipment 100 performs the vacuum operation, since the environment in the baking chamber 101 approaches a vacuum state, the hot air circulation effect is weakened, resulting in the second heating mode having an insignificant baking effect on the electrode sheet 200. At this time, the baking can be performed in a manner of mainly using the first heating mode and supplemented by the second heating mode. The first heating element 21 can be used to perform heat conduction heating on the electrode sheet 200 to maintain the temperature of the electrode sheet 200, and can also take away the water vapor near the electrode sheet 200. Not only can the residual solvent on the electrode sheet 200 be removed quickly and effectively, shortening the baking time, but also energy consumption can be reduced, thereby effectively improving energy utilization efficiency.

[0072] The airflow in the circulation channel 102 is heated by the second heating element 22, and the airflow in the circulation channel 102 is driven by the blowing assembly 23 to flow into the first accommodating chamber 30a through the baking chamber 101, and then flows back to the circulation channel 102 from the first accommodating chamber 30a through the baking chamber 101. On the one hand, the airflow can circulate along the circulation channel 102, the baking chamber 101 and the first accommodating chamber 30a, which is conducive to reducing the temperature difference in the baking chamber 101, thereby improving the heating uniformity of the electrode sheet 200; on the other hand, the airflow can carry away the electrode sheet 200 during the circulation process. 00, can reduce the risk of uneven drying of the electrode sheet 200 due to the accumulation or condensation of water vapor near the electrode sheet 200; thirdly, the second heating element 22 can not only provide a basic heat source for the circulation channel 102, but also can supplement the temperature of the airflow flowing into the circulation channel 102 from the baking chamber 101, so as to reduce the heat loss of the airflow during the circulation process, and evaporate the water vapor flowing into the circulation channel 102 with the airflow, so as to reduce the water vapor content of the airflow flowing from the circulation channel 102 into the baking chamber 101, which can effectively improve the drying efficiency and quality of the electrode sheet 200.

[0073] In some embodiments, please refer to Figure 3 , and also refer to Figure 4 The box body 10 includes an inner container 11 and an outer shell 12. The inner container 11 forms a baking cavity 101. The outer shell 12 is sleeved outside the inner container 11 and is spaced apart from the inner container 11 to form a circulation channel 102 between the outer shell 12 and the inner container 11. The inner container 11 is provided with a second through hole 11a connecting the baking cavity 101 and the circulation channel 102.

[0074] The outer shell 12 is sleeved on the outer shell of the inner shell 11, and a gap is formed between the outer shell 12 and the inner shell 11. The circulation channel 102 may be a gap formed between the outer shell 12 and the inner shell 11. The circulation channel 102 is connected to the baking chamber 101 through a second through hole 11a provided in the inner shell 11 to form a circulation path for airflow.

[0075] There are multiple second through holes 11a, and the multiple second through holes 11a can be evenly distributed on the corresponding area of ​​the inner liner 11, or the multiple second through holes 11a can be unevenly distributed on the corresponding area of ​​the inner liner 11. The second through holes 11a can be provided in the inner liner 11 by stamping, laser cutting, electric spark drilling, water jet drilling, milling drilling, etc., but are not limited thereto.

[0076] The second heating element 22 can be arranged on the side of the inner tank 11 facing the circulation channel 102 and spaced apart from the outer shell 12 to reduce the heat generated by the second heating element 22 from being conducted to the outer shell 12 and dissipated through the outer shell 12, thereby not only reducing energy loss but also reducing the risk of scalding the user due to overheating of the outer shell 12.

[0077] By forming a circulation channel 102 between the outer shell 12 and the inner shell 11, and providing a second through hole 11a on the inner shell 11 to connect the baking chamber 101 and the circulation channel 102, the blowing assembly 23 can drive the airflow in the circulation channel 102 to pass through the baking chamber 101 and the first accommodating chamber 30a in sequence, and flow back into the circulation channel 102 to form an airflow circulation, which can not only reduce the temperature difference in the baking chamber 101 and improve the heating uniformity of the electrode sheet 200, but also the airflow can take away the water vapor near the electrode sheet 200 during the circulation process, which can reduce the risk of uneven drying of the electrode sheet 200 due to the accumulation or condensation of water vapor near the electrode sheet 200.

[0078] In some embodiments, a heat insulating layer is provided on the side of the outer shell 12 facing the circulation channel 102, and / or a heat insulating layer is filled in the area between the outer shell 12 and the inner liner 11 where the circulation channel 102 is not formed, which can reduce the conduction of heat to the outer shell 12, thereby further reducing energy loss and reducing the risk of scalding the user due to overheating of the outer shell 12. The heat insulating layer can be made of high temperature resistant heat insulating materials, such as ceramic fiber, glass fiber, aerogel felt, etc., but is not limited thereto.

[0079] In some embodiments, a temperature sensor 25 is provided in the circulation channel 102, and the second heating element 22 and the temperature sensor 25 are both connected to the control system of the baking device 100. The temperature sensor 25 is used to monitor the temperature in the circulation channel 102 in real time, and send the temperature in the circulation channel 102 to the control system in real time. The control system can adjust the power of the second heating element 22 according to the temperature monitored by the temperature sensor 25 to maintain the temperature in the circulation channel 102 stable within a set range. For example, when the temperature in the circulation channel 102 is lower than the set range, the control system adjusts the power of the second heating element 22 to increase; when the temperature in the circulation channel 102 is higher than the set range, the control system adjusts the power of the second heating element 22 to decrease.

[0080] In some embodiments, the circulation channel 102 includes a first channel 102a. The inner pot 11 includes a first back plate 111, two second side plates 112 arranged opposite to each other, and two third side plates 113 arranged opposite to each other. The two second side plates 112 and the two third side plates 113 are arranged on the same side of the first back plate 111, and are arranged around the outer edge of the first back plate 111 to form a baking cavity 101. The second heating element 22 is arranged on at least one of the two third side plates 113, and the two second side plates 112 are provided with second through holes 11a. The two second side plates 112 and the first back plate 111 are spaced apart from the outer shell 12 to form a first channel 102a surrounding the two second side plates 112 and the first back plate 111.

[0081] The two second side panels 112 can be used as the side walls of the inner liner 11; or, one of the two second side panels 112 can be used as the top wall of the inner liner 11, and the other can be used as the bottom wall of the inner liner 11. The two third side panels 113 can be used as the side walls of the inner liner 11; or, one of the two third side panels 113 can be used as the top wall of the inner liner 11, and the other can be used as the bottom wall of the inner liner 11. For example, when the two second side panels 112 are used as the side walls of the inner liner 11, one of the two third side panels 113 is used as the top wall of the inner liner 11, and the other is used as the bottom wall of the inner liner 11; when one of the two second side panels 112 is used as the top wall of the inner liner 11, and the other is used as the bottom wall of the inner liner 11, the two third side panels 113 are used as the side walls of the inner liner 11. The following embodiments are described by taking the two second side panels 112 as the side walls of the inner container 11 , and one of the two third side panels 113 as the top wall of the inner container 11 , and the other as the bottom wall of the inner container 11 as an example.

[0082] In some embodiments, the two second side panels 112 are each provided with a plurality of second through holes 11a. The blowing assembly 23 is provided in the area opposite to the housing 12 and the first back panel 111. The blowing assembly 23 can drive the airflow to flow from the first flow channel 102a close to the first back panel 111 into the first flow channel 102a close to one of the two second side panels 112, and flow into the baking chamber 101 and the first accommodating chamber 30a through the second through holes 11a on one of the two second side panels 112, and then flow into the first flow channel 102a close to the other of the two second side panels 112 through the second through holes 11a on the other of the two second side panels 112, and then flow into the first flow channel 102a close to the first back panel 111 along the first flow channel 102a close to the other of the two second side panels 112, forming an airflow cycle.

[0083] The arrangement direction of the two second side plates 112 is perpendicular to the stacking direction of the electrode sheet 200, that is, the arrangement direction of the two second side plates 112 is perpendicular to the arrangement direction of the electrode sheet 200 and the first heating element 21, so that the flow direction of the circulating airflow in the baking chamber 101 is perpendicular to the heat conduction direction of the first heating element 21, thereby realizing baking of the electrode sheet 200 from multiple directions, which not only enables the electrode sheet 200 to be heated evenly and improves the drying effect of the electrode sheet 200, but also shortens the baking time and improves the baking efficiency of the electrode sheet 200.

[0084] The second heating element 22 is disposed on at least one of the two third side plates 113 and is located in the circulation channel 102. The circulation channel 102 where the second heating element 22 is located is connected to the first channel 102a. Since the third side plate 113 is not provided with the second through hole 11a, the airflow heated by the second heating element 22 cannot directly flow into the baking chamber 101 through the third side plate 113, but flows into the first channel 102a and is fully mixed with the airflow in the first channel 102a, thereby reducing the phenomenon that the airflow in the circulation channel 102 is not fully mixed, resulting in excessive temperatures in some areas of the baking chamber 101 and insufficient temperatures in some areas.

[0085] By arranging second through holes 11a on two second side plates 112 that are arranged opposite to each other, arranging the second heating element 22 on at least one of the two third side walls, and arranging the two second side plates 112 and the first back plate 111 to be spaced apart from the outer shell 12, so as to form a first flow channel 102a surrounding the two second side plates 112 and the first back plate 111, on the one hand, the airflow can flow from the first flow channel 102a into the baking cavity 101 and the first accommodating cavity 30a through the second through hole 11a on one of the two second side plates 112, and flow back to the first flow channel 102a through the second through hole 11a on the other of the two second side plates 112, so as to form heat convection, so that the airflow can circulate stably and quickly, which can not only It can improve the heating speed and heating uniformity of the electrode sheet 200, and can also reduce heat loss; on the other hand, by providing a second through hole 11a on the second side plate 112 where the second heating element 22 is not provided, and providing a second heating element 22 on the third side plate 113 where the second through hole 11a is not provided, it can not only reduce the phenomenon of uneven temperature distribution in the baking chamber 101 caused by insufficient mixing of the airflow in the circulation channel 102, thereby improving the uniformity of temperature distribution in the baking chamber 101, but also reduce the risk of water vapor flowing into the first channel 102a through the second through hole 11a directly contacting the second heating tube, thereby causing the second heating tube to be oxidized or corroded by water vapor, which helps to extend the service life of the second heating tube.

[0086] In some embodiments, please refer to Figure 4, the outer shell 12 includes a second back plate 121. The second back plate 121 is opposite to and spaced from the first back plate 111 of the inner liner 11, so as to form a circulation channel 102 between the first back plate 111 and the second back plate 121. A flange 114 is formed at one end of the inner liner 11 away from the second back plate 121, and the flange 114 extends from the inner liner 11 toward the circulation channel 102. The second heating element 22 has a first end 221 and a second end 222 that are relatively arranged, the first end 221 is fixed to the flange 114, and the second end 222 is fixed to the second back plate 121. The setting of the flap facilitates the installation of the second heating element 22, and the flap can also act as a bracket, supported between the inner liner 11 and the outer shell 12, which can enhance the connection strength between the inner liner 11 and the outer shell 12, thereby enhancing the overall structural strength of the box body 10.

[0087] In some embodiments, the box body 10 further includes a reinforcing beam 13. The reinforcing beam 13 is disposed in the circulation channel 102 and connected between the flange 114 and the second back plate 121. After the baking device 100 is vacuumed, the pressure difference between the inside and outside of the baking device 100 is relatively large. By providing the reinforcing beam 13, the structural strength of the box body 10 can be enhanced, and the risk of collapse or cracking of the box body 10 due to the large pressure difference between the inside and outside of the baking device 100 can be reduced.

[0088] In some embodiments, the circulation channel 102 also includes a second flow channel (not shown), and the second heating element 22 is disposed on a third side plate 113; the other third side plate 113 is provided with a second through hole 11a, and is spaced apart from the outer shell 12 to form a second flow channel on the side of the other third side plate 113 facing away from the baking chamber 101, and the second flow channel is connected to the first flow channel 102a.

[0089] The second heating element 22 provided on a third side plate 113 can heat the airflow in the circulation channel 102. The airflow heated by the second heating element 22 diffuses and mixes toward the first channel 102a and the second channel, which can improve the temperature uniformity of the airflow in the first channel 102a and the second channel, thereby improving the temperature distribution uniformity in the baking chamber 101. The airflow in the second channel can flow into the baking chamber 101 through the second through hole 11a on the other third side plate 113, and merge with the airflow flowing in from the second through hole 11a on one of the two second side plates 112 to dry the electrode sheet 200, and carry the water vapor in the baking chamber 101 and the first accommodating chamber 30a to flow into the first channel 102a from the second through hole 11a on the other of the two second side plates 112.

[0090] In some embodiments, a third side plate 113 serves as the bottom wall of the inner pot 11, the second heating element 22 is disposed on the bottom wall of the inner pot 11, and another third side plate 113 serves as the top wall of the inner pot 11, and the top wall of the inner pot 11 is provided with a second through hole 11a. Since the first heating element 21 is disposed in contact with the bottom wall of the first container 30, by providing the second through hole 11a on the top wall of the inner pot 11, the airflow flowing into the baking chamber 101 through the second through hole 11a on the top wall of the inner pot 11 forms thermal convection with the heat generated by the first heating element 21, so that the heat can act on the electrode sheet 200 from the top and the bottom at the same time, which can not only improve the heating uniformity of the electrode sheet 200, but also accelerate the heat transfer, thereby improving the baking efficiency of the electrode sheet 200.

[0091] By arranging the first heating element 21 on the third side plate 113, and arranging the second through hole 11a on the other third side plate 113, and forming a second flow channel connected to the first flow channel 102a on the side of the other third side plate 113 facing away from the baking chamber 101, the second heating element 22 can heat the airflow in the circulation flow channel 102, and the airflow heated by the second heating element 22 diffuses and mixes toward the first flow channel 102a and the second flow channel, thereby improving the temperature uniformity of the airflow in the first flow channel 102a and the second flow channel.

[0092] In some embodiments, the two oppositely disposed second side plates 112 and the two oppositely disposed third side plates 113 are both provided with a second through hole 11a connecting the baking chamber 101 and the circulation channel 102, and the two second side plates 112 and the two third side plates 113 are both provided with a second heating element 22 on one side close to the circulation channel 102.

[0093] In some embodiments, the blowing assembly 23 includes a magnetic flow blower.

[0094] By using a magnetic flow blower as the blowing component 23, the sealing performance of the installation area of ​​the blowing component 23 can be improved, thereby reducing the impact of the installation of the blowing component 23 on the temperature in the circulation channel 102, which is beneficial to reducing heat loss in the circulation channel 102.

[0095] In some embodiments, the blowing assembly 23 may also include a brushless DC fan, a turbine fan, an axial flow fan, a centrifugal fan, etc., but is not limited thereto.

[0096] In some embodiments, please refer to Figure 1 and Figure 3 The baking device 100 further includes a second container 40. The second container 40 is disposed in the baking cavity 101 and forms a second accommodating cavity 40a. The first heating element 21 and the first container 30 are both disposed in the second accommodating cavity 40a.

[0097] The second container 40 can be detachably disposed in the baking chamber 101. After the electrode sheet 200 is baked, the second container 40 can be taken out of the baking chamber 101, which is convenient for cleaning the baking chamber 101 and can improve the cleaning efficiency and cleaning effect of the baking chamber 101. The second container 40 can be detachably disposed in the baking chamber 101 by means of a track, a hook, or a hanger, but is not limited thereto.

[0098] The second accommodating cavity 40a is a relatively independent space and is smaller than the baking cavity 101. By arranging the second container 40 in the baking cavity 101 and arranging the first heating element 21 and the first container 30 in the second accommodating cavity 40a of the second container 40, it helps to increase the heating rate of the electrode sheet 200, and can reduce the heat loss generated by the first heating element 21, thereby improving the energy utilization rate.

[0099] In some embodiments, the second container 40 includes a second bottom plate 41 and two fourth side plates 42 disposed opposite to each other. The first heating element 21 is disposed on the side of the second bottom plate 41 facing the second accommodating cavity 40a. The two fourth side plates 42 disposed opposite to each other are connected to the outer edge of the second bottom plate 41 to form the second accommodating cavity 40a, and are disposed on the same side as the second side plate 112. The fourth side plate 42 is provided with a third through hole 42a connecting the baking cavity 101 and the second accommodating cavity 40a.

[0100] When the first container 30 is disposed in the second container 40 , the first bottom plate 31 of the first container 30 and the second bottom plate 41 of the second container 40 are disposed opposite to each other, and the first heating element 21 is disposed between the first bottom plate 31 and the second bottom plate 41 .

[0101] There are multiple third through holes 42a, and the multiple third through holes 42a can be evenly distributed on the fourth side plate 42, or the multiple third through holes 42a can be unevenly distributed on the fourth side plate 42. The third through holes 42a can be provided on the fourth side plate 42 by stamping, laser cutting, electric spark drilling, water jet drilling, milling drilling, etc., but are not limited thereto.

[0102] The second container 40 may be a split structure, that is, the second bottom plate 41 and the fourth side plate 42 may be independent components, and the second bottom plate 41 and the fourth side plate 42 are combined into one by a fixed connection, wherein the fixed connection method may be welding, rivet connection or bolt connection, etc., but not limited thereto. The second container 40 may also be an integrally formed structure, that is, the second bottom plate 41 and the fourth side plate 42 are integrally formed, and the integral forming method may be stamping and milling, etc., but not limited thereto. By integrally forming the second bottom plate 41 and the fourth side plate 42, the number of parts and the assembly process can be reduced, thereby saving assembly time, and improving the production efficiency of the first container 30.

[0103] The two fourth side panels 42 are arranged opposite to each other and are arranged on the same side of the second bottom panel 41. When the second container 40 is arranged in the baking chamber 101, the fourth side panel 42 of the second container 40 is arranged on the same side as the second side panel 112 of the inner container 11, and the plane where the fourth side panel 42 is located is parallel to the plane where the second side panel 112 is located.

[0104] By providing a third through hole 42a connecting the baking chamber 101 and the second accommodating chamber 40a on the fourth side plate 42, the airflow flowing into the baking chamber 101 through the second through hole 11a of one of the two second side plates 112 can flow into the second accommodating chamber 40a through the third through hole 42a of one of the two fourth side plates 42, and then flow into the first accommodating chamber 30a through the first through hole 33a of the first side plate 33, so as to bake the electrode sheet 200 in the first accommodating chamber 30a, and then flow out of the baking chamber 101 through the first through hole 33a of the first side plate 33, the third through hole 42a of the other of the two fourth side plates 42 and the second through hole 11a of the other of the two second side plates 112 in sequence, so as to form heat convection, so that the airflow can circulate stably and quickly, which can not only improve the heating speed and heating uniformity of the electrode sheet 200, but also reduce heat loss.

[0105] By arranging the two relatively arranged fourth side panels 42 on the same side as the second side panel 112 of the inner tank 11, and arranging the third through hole 42a on the fourth side panel 42, on the one hand, it can promote the formation of convection of the airflow, so that the electrode sheet 200 is heated more evenly; on the other hand, the fourth side panel 42 can limit the first container 30 arranged in the second accommodating cavity 40a, thereby reducing the risk of the first container 30 shaking or falling during the installation or removal of the second container 40, thereby reducing the risk of deformation or damage of the electrode sheet 200 and improving the reliability of the electrode sheet 200.

[0106] In some embodiments, the baking apparatus 100 includes a plurality of second containers 40 , and a plurality of first containers 30 are disposed in each second container 40 .

[0107] A plurality of second containers 40 may be arranged in the baking cavity 101 via tracks. In some embodiments, the inner pot 11 is provided with oppositely arranged first tracks (not shown) on opposite sides facing the baking cavity 101, and the second container 40 is provided with second tracks (not shown) adapted to the first tracks on opposite sides facing away from the second accommodating cavity 40a; wherein the first track and the second track may extend along the arrangement direction of the top and bottom of the box body 10, and the second container 40 may be arranged in the second container 40 in a stacked manner along the first track via the second track; or, the first track and the second track may extend in a direction perpendicular to the arrangement direction of the top and bottom of the box body 10, and the second container 40 may be arranged in the second container 40 in a push-pull manner along the first track via the second track.

[0108] By configuring the baking device 100 to include multiple second containers 40, and each second container 40 is provided with multiple first containers 30, it is convenient to quickly load or remove the electrode sheet 200 into the baking chamber 101, which can improve the loading and removal efficiency of the electrode sheet 200 and help shorten the drying time of the electrode sheet 200.

[0109] In some embodiments, the baking device 100 includes a plurality of boxes 10, the electrode sheets 200 include positive electrode sheets and negative electrode sheets, a portion of the plurality of boxes 10 is used for baking the positive electrode sheets, and another portion is used for baking the negative electrode sheets.

[0110] In the multiple boxes 10, each box 10 or the panel 51 or door 52 corresponding to each box 10 is provided with a mark to indicate the polarity of the electrode sheet 200 used for baking in the box 10, which can reduce the risk of mixing up the positive electrode sheet and the negative electrode sheet.

[0111] By configuring the baking device 100 to include a plurality of boxes 10, a portion of the plurality of boxes 10 is used to bake the positive electrode sheets, and another portion is used to bake the negative electrode sheets, so as to reduce the risk of mixing the positive electrode sheets and the negative electrode sheets.

[0112] In some embodiments, the baking device 100 further includes a panel 51 and a door 52, wherein the panel 51 is disposed on one side of the housing 10, and an open portion 51a communicating with the baking chamber 101 is disposed on the panel 51. The door 52 is disposed on the panel 51, and is used to open or close the open portion 51a. When the door 52 is in an open state, the second container 40 containing the first container 30 and the first heating tube can be disposed in the baking chamber 101 through the open portion 51a, or the second container 40 containing the first container 30 and the first heating tube can be taken out through the open portion 51a, wherein the first container 30 contains the electrode sheet 200. When the door 52 is in a closed state, the open portion 51a can be sealed to reduce or eliminate the risk of leakage of the airflow in the baking chamber 101 from the open portion 51a.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A baking device, characterized in that: The baking equipment comprises: A box body is formed with a baking cavity; A first heating element is disposed in the baking cavity; A first container is disposed in the baking chamber and is in contact with the first heating element, wherein the first container is formed with a first accommodating cavity, and the first accommodating cavity is used to accommodate the electrode sheet; A pressing plate is used for pressing on a side of the electrode sheet away from the first heating element.

2. The baking device according to claim 1, characterized in that: The first heating element is located at one side of the first container along a first direction, and the first direction is configured as a stacking direction of the electrode sheets.

3. The baking device according to claim 2, characterized in that: In the baking state, the first direction is the gravity direction, and along the gravity direction, the pressing plate, the electrode sheet, the bottom wall of the first container and the first heating element are contacted and arranged in sequence.

4. The baking device according to claim 3, characterized in that: The first container comprises a first bottom plate, which serves as the bottom wall of the first container and is arranged in contact with the first heating element. The pressing plate is used to press the side of the electrode sheet facing away from the first bottom plate.

5. The baking device according to claim 4, characterized in that: The first container also includes a first side plate, which is arranged around the outer edge of the first bottom plate to form the first accommodating cavity. An opening connected to the first accommodating cavity is formed at one end of the first side plate away from the first bottom plate, and the pressure plate is arranged at the opening.

6. The baking device according to claim 5, characterized in that: The first side plate is provided with a first through hole connecting the baking cavity and the first accommodating cavity.

7. The baking device according to claim 1, characterized in that: The box body is formed with a circulation channel, and the circulation channel, the baking chamber and the first accommodating chamber are sequentially connected; the baking device further includes: A second heating element is disposed in the circulation channel; The blowing assembly is at least partially disposed in the circulation channel, and is used to drive the airflow in the circulation channel to flow into the first accommodating cavity via the baking cavity, and then flow from the first accommodating cavity back into the circulation channel via the baking cavity.

8. The baking device according to claim 7, characterized in that: The box body comprises: An inner pot, forming the baking cavity; An outer shell is sleeved outside the inner shell and is spaced apart from the inner shell to form the circulation channel between the outer shell and the inner shell; Wherein, the inner pot is provided with a second through hole connecting the baking cavity and the circulation channel.

9. The baking device according to claim 8, characterized in that: The circulation channel includes a first channel; the inner pot includes a first back plate, two second side plates arranged opposite to each other, and two third side plates arranged opposite to each other, the two second side plates and the two third side plates are arranged on the same side of the first back plate, and are arranged around the outer edge of the first back plate to form the baking cavity; The second heating element is arranged on at least one of the two third side plates, and the two second side plates are provided with the second through hole; the two second side plates and the first back plate are spaced apart from the outer shell to form the first flow channel surrounding the two second side plates and the first back plate.

10. The baking device according to claim 9, characterized in that: The circulation flow channel also includes a second flow channel, and the second heating element is arranged on one of the third side plates; the other third side plate is provided with the second through hole and is spaced apart from the outer shell to form the second flow channel on the side of the other third side plate facing away from the baking chamber, and the second flow channel is connected to the first flow channel.

11. The baking device according to claim 7, characterized in that: The blowing assembly comprises a magnetic flow blower.

12. The baking device according to claim 9, characterized in that: The baking device further includes a second container, which is disposed in the baking cavity and forms a second accommodating cavity, and the first heating element and the first container are both disposed in the second accommodating cavity.

13. The baking device according to claim 12, characterized in that: The second container comprises: a second bottom plate, wherein the first heating element is disposed on a side of the second bottom plate facing the second accommodating cavity; Two fourth side panels are arranged opposite to each other, connected to the outer edge of the second bottom plate to form the second accommodating cavity, and are arranged on the same side as the second side panel. The fourth side panels are provided with a third through hole connecting the baking cavity and the second accommodating cavity.

14. The baking device according to claim 12, characterized in that: The baking device comprises a plurality of the second containers, and a plurality of the first containers are arranged in each of the second containers.

15. The baking device according to any one of claims 1 to 14, characterized in that: The baking equipment comprises a plurality of boxes, the electrode sheets comprise positive electrode sheets and negative electrode sheets, a part of the plurality of boxes is used for baking the positive electrode sheets, and another part of the boxes is used for baking the negative electrode sheets.

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