Pole piece drying equipment

Abstract

The utility model describes pole piece drying equipment, which comprises a preheating device, a drying device and a drying device, a second drying chamber is arranged in the constant-speed device, and the second drying chamber is communicated with the first drying chamber; the speed reducing device is internally provided with a third drying chamber, the constant-speed device is arranged between the preheating device and the speed reducing device, and the third drying chamber is communicated with the second drying chamber; wherein the pole pieces are conveyed from the first drying chamber to the third drying chamber at a constant speed, and the lengths of the first drying chamber, the second drying chamber and the third drying chamber are different in the conveying direction. Therefore, the duration of the pole piece in the first drying chamber, the duration of the pole piece in the second drying chamber and the duration of the pole piece in the third drying chamber are different, so that the pole piece can be better dried at different stages to different degrees, and the quality of the pole piece is better improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery pole piece preparation technical field especially relates to a pole piece drying equipment. BACKGROUND

[0002] In the manufacturing process of the battery, coating and drying are two important steps in the production process of lithium battery. Coating is to uniformly coat the slurry on the positive and negative pole foil to form a coating of a certain thickness. After the coating process, the foil with the coating is the pole piece. The drying process is to remove the solvent in the slurry to form a stable adhesion between the coating and the foil.

[0003] However, in actual production, the drying process of the pole piece is not controlled in detail, resulting in poor quality of the dried pole piece, and even the separation of the coating of the pole piece from the foil, causing the battery to fail. INVENTION CONTENTS

[0004] The utility model discloses in view of above-mentioned present situation, a kind of pole piece drying equipment is provided, which can improve the drying quality of pole piece.

[0005] In order to achieve the above purpose, the utility model provides a kind of pole piece drying equipment, it includes: preheating device, inside is equipped with first drying chamber;Constant speed device, inside is equipped with second drying chamber, and the second drying chamber with the first drying chamber is communicated;Speed reducer, inside is equipped with third drying chamber, the constant speed device is arranged between the preheating device and the speed reducer, and the third drying chamber with the second drying chamber is communicated;Wherein, the pole piece is transmitted by the first drying chamber to the direction of the third drying chamber at uniform speed, and along the direction of transmission, the length of the first drying chamber, the second drying chamber and the third drying chamber is different.

[0006] Optionally, the temperature in the first drying chamber is a first temperature, the temperature in the second drying chamber is a second temperature, and the temperature in the third drying chamber is a third temperature. The second temperature, the first temperature and the third temperature increase in turn.

[0007] Optionally, the pole piece drying equipment further includes a first fan assembly connected to the preheating device, a second fan assembly connected to the constant speed device, and a third fan assembly connected to the speed reducer. The air speeds of the first fan assembly, the second fan assembly and the third fan assembly are different.

[0008] Optionally, the rotation speed of the first fan assembly is a first rotation speed, the rotation speed of the second fan assembly is a second rotation speed, and the rotation speed of the third fan assembly is a third rotation speed. The second rotation speed, the first rotation speed and the third rotation speed increase in turn.

[0009] Optionally, the pole piece drying device comprises a plurality of ovens, each of the ovens having a drying cavity; the preheating device comprises a plurality of the ovens, the drying cavities of the plurality of ovens of the preheating device being sequentially communicated to form the first drying chamber; the constant-speed device comprises a plurality of the ovens, the drying cavities of the plurality of ovens of the constant-speed device being sequentially communicated to form the second drying chamber; the speed-reducing device comprises one oven, the drying cavity of the oven of the speed-reducing device forming the third drying chamber, or the speed-reducing device comprises a plurality of ovens, the drying cavities of the plurality of ovens of the speed-reducing device being sequentially communicated to form the third drying chamber; wherein the number of the ovens of the preheating device is greater than the number of the ovens of the speed-reducing device, and the number of the ovens of the constant-speed device is greater than the number of the ovens of the speed-reducing device.

[0010] Optionally, the preheating device comprises two ovens, the constant-speed device comprises two ovens, and the constant-speed device comprises one oven; or, the preheating device comprises three ovens, the constant-speed device comprises three ovens, and the constant-speed device comprises two ovens.

[0011] Optionally, the top of the oven is provided with two air inlets and an air outlet; and the bottom of the oven is provided with one air inlet.

[0012] Optionally, the pole piece drying device further comprises a connecting piece, the connecting piece being provided with a connecting cavity; the connecting piece connects two adjacent ovens, and the connecting cavity is in communication with two adjacent drying cavities; wherein, in a vertical plane perpendicular to a horizontal plane, the cross-sectional area of the connecting piece is smaller than the cross-sectional area of the oven.

[0013] Optionally, the pole piece drying device comprises a conveying mechanism, the conveying mechanism being provided through the first drying chamber to the third drying chamber, the conveying mechanism being used to uniformly convey the pole pieces along the first drying chamber, the second drying chamber, and the third drying chamber; and / or, the conveying mechanism comprises a plurality of conveying rollers, the plurality of conveying rollers being used to carry pole pieces, and two adjacent conveying rollers are spaced apart.

[0014] Optionally, the ratio of the length of the preheating device to the length of the pole piece drying device is between 37.5% and 40%; the ratio of the length of the constant-speed device to the length of the pole piece drying device is between 37.5% and 40%; and the ratio of the length of the speed-reducing device to the length of the pole piece drying device is between 20% and 25%.

[0015] The extreme piece drying equipment related in the utility model includes a plurality of preheating devices, constant speed devices and speed reduction devices connected in sequence, so that the extreme piece can be dried in three stages. Among them, the extreme piece is uniformly transmitted from the first drying chamber to the third drying chamber, and the lengths of the first drying chamber, the second drying chamber and the third drying chamber are different along the transmission direction. Therefore, the time length of the extreme piece in the first drying chamber, the second drying chamber and the third drying chamber is also different, so that different degrees of drying can be better carried out for the extreme piece in different stages. Accordingly, the extreme piece is dried by using the extreme piece drying equipment, and the drying can be more detailed and differentiated for the different stages of the extreme piece, so that the quality of the extreme piece is better improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0017] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0018] Figure 1 is a side view showing the extreme piece drying equipment related in the present application.

[0019] Figure 2 is a side view showing the extreme piece drying equipment related in the present application for conveying the extreme piece.

[0020] Figure 3 is a side view showing the oven in the extreme piece drying equipment related in the present application.

[0021] Figure 4 is a side view showing the extreme piece drying equipment related in the present application including eight ovens.

[0022] Figure 5 is a schematic view showing the extreme piece dried by hot air related in the present application.

[0023] Reference numerals: 100, extreme piece; 101, coating; 102, foil; 1, preheating device; 2, constant speed device; 3, speed reduction device; 4, oven; 41, air inlet; 42, air outlet; 5, connecting piece; 6, conveying mechanism; 61, conveying roller. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present application will be described in detail below with reference to the drawings. In the following description, identical components are denoted by identical reference numerals, and overlapping explanations will be omitted. In addition, the drawings are schematic diagrams, and the ratio of the dimensions of the components to each other or the shape of the components, etc. can differ from reality. Note that all directional references (such as upper, lower, left, right, front, rear, etc.) contained in the present application are intended to facilitate the description of the relative position and / or movement of the components to each other and are not intended to limit the position and / or movement to a particular orientation. If the particular orientation changes, the directional references will also change accordingly.

[0025] It is also noted that when an element is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements can be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can be present.

[0026] Referring to Figure 1 and Figure 2 The present application provides a pole piece drying device, which comprises a preheating device 1, a constant speed device 2 and a speed reduction device 3. The preheating device 1 is internally provided with a first drying chamber; the constant speed device 2 is internally provided with a second drying chamber, and the second drying chamber is in communication with the first drying chamber; the speed reduction device 3 is internally provided with a third drying chamber, and the constant speed device 2 is arranged between the preheating device 1 and the speed reduction device 3, and the third drying chamber is in communication with the second drying chamber; wherein the pole piece 100 is uniformly transmitted from the first drying chamber to the third drying chamber, and the lengths of the first drying chamber, the second drying chamber and the third drying chamber are different along the transmission direction.

[0027] According to the above structure, the pole piece drying device involved in the present application can dry the pole piece in three stages. Since the pole piece 100 stays in the first drying chamber, the second drying chamber and the third drying chamber for different lengths of time, the pole piece 100 can be better dried in different stages to different degrees. Accordingly, the pole piece 100 can be better dried in different stages in a detailed and differentiated manner by using the pole piece drying device, thereby better improving the drying quality of the pole piece 100.

[0028] Referring to Figure 2In some embodiments, the pole piece drying device comprises a conveying mechanism 6, the conveying mechanism 6 is provided with the first drying chamber and the third drying chamber, and the conveying mechanism 6 is used for uniformly conveying the pole piece 100 along the first drying chamber, the second drying chamber and the third drying chamber. In this way, the pole piece 100 is sequentially conveyed by the first drying chamber, the second drying chamber and the third drying chamber. Specifically, the preheating device 1 is provided with an inlet, and the speed reduction device 3 is provided with an outlet. The pole piece 100 enters the first drying chamber through the inlet, and under the conveying of the conveying mechanism 6, the pole piece 100 is sequentially conveyed to the second drying chamber and the third drying chamber, and finally is conveyed out through the outlet.

[0029] In some embodiments, the temperature in the first drying chamber is a first temperature, the temperature in the second drying chamber is a second temperature, and the temperature in the third drying chamber is a third temperature; the second temperature is less than the first temperature, and the first temperature is less than the third temperature.

[0030] Specifically, referring to Figure 5The coating is uniformly applied on the positive and negative electrode foils 102, and the slurry contains a binder to sufficiently bond the active material particles in the slurry and enable the formed coating 101 to be sufficiently bonded to the foils 102. After the coating process is completed, the surface of the electrode sheet 100 is similar to a wet film. First, the electrode sheet 100 is dried in the first drying chamber at a first temperature, which is a relatively high temperature, so that the temperature of the coating 101 rapidly rises until the solvent evaporates. Because the first temperature is relatively high, there is a certain temperature difference between the surface and the interior of the coating 101, so that the surface of the coating 101 dries first, and the binder in the coating 101 is inhibited from continuously floating to the surface of the coating 101, so that the binder in the coating 101 is preliminarily inhibited in the interior of the coating 101 in the first drying chamber. Then, when the electrode sheet 100 enters the second drying chamber to be dried at a second temperature, which is a relatively low temperature, so that the diffusion speed of the solvent in the interior of the coating 101 is almost equal to the evaporation speed of the surface, thereby further drying the electrode sheet 100. Because the binder in the coating 101 has been preliminarily inhibited in the interior of the coating 101 in the first drying chamber, in the second drying chamber, because the diffusion speed of the solvent in the interior of the coating 101 is almost equal to the evaporation speed of the surface, the binder in the coating 101 does not significantly migrate, and the binder is further inhibited in the interior of the coating 101. Finally, the electrode sheet 100 enters the third drying chamber to be dried at a third temperature, which is the highest temperature, at which the electrode sheet 100 is substantially dried in the third drying chamber, and the binder in the coating 101 has been severely inhibited and almost does not migrate any more. Thus, after the electrode sheet 100 is dried in the first drying chamber, the second drying chamber, and the third drying chamber, the binder can be sufficiently inhibited in the interior of the coating 101, the adhesion of the coating 101 is improved, and the problem of the coating 101 separating from the foils 102, i.e., the problem of the electrode sheet 100 dropping material, is effectively improved.

[0031] In some embodiments, the electrode sheet drying device further comprises a first fan assembly connected to the preheating device 1, a second fan assembly connected to the constant speed device 2, and a third fan assembly connected to the speed reduction device 3; the air speeds of the first fan assembly, the second fan assembly, and the third fan assembly are different. Thus, when the electrode sheet 100 enters the first drying chamber, the second drying chamber, and the third drying chamber, the electrode sheet 100 can be dried in stages due to the difference in air speed, thereby better improving the drying quality of the electrode sheet 100.

[0032] In some embodiments, the rotation speed of the first fan assembly is a first rotation speed, the rotation speed of the second fan assembly is a second rotation speed, and the rotation speed of the third fan assembly is a third rotation speed, the rotation speeds of the second rotation speed, the first rotation speed and the third rotation speed are sequentially increased. It can be understood that, in combination with the temperatures of the second temperature, the first temperature and the third temperature, the temperatures are sequentially increased, then in the first drying chamber, the pole piece 100 can be dried at a higher temperature and a higher wind speed, in the second drying chamber, the pole piece 100 can be dried at the lowest temperature and the lowest wind speed, and in the third drying chamber, the pole piece 100 can be dried at the highest temperature and the highest wind speed.

[0033] Specifically, the pole piece 100 is dried at a higher temperature and a higher wind speed in the first drying chamber, at this time, the hot air in the first drying chamber performs thermal shock on the surface of the coating 101, so that the surface of the coating 101 is dried first, and the binder in the coating 101 is also inhibited from floating to the surface of the coating 101, then in the first drying chamber, the binder in the coating 101 can be preliminarily inhibited in the interior of the coating 101. Then, when the pole piece 100 enters the second drying chamber to be dried at the lowest temperature and the lowest wind speed, the second drying chamber reduces the drying rate, so that the diffusion speed of the solvent in the interior of the coating 101 is almost equal to the evaporation speed of the surface, thereby further drying the pole piece 100. Since the binder in the coating 101 has been preliminarily inhibited in the interior of the coating 101 in the first drying chamber, in the second drying chamber, since the diffusion speed of the solvent in the interior of the coating 101 is almost equal to the evaporation speed of the surface, the binder in the coating 101 does not migrate obviously, and the binder is further inhibited in the interior of the coating 101. Finally, the pole piece 100 enters the third drying chamber to be dried at the highest temperature and the highest wind speed, so that the pole piece 100 is basically dried in the third drying chamber, the binder in the coating 101 has been severely inhibited, and almost no migration occurs. Thus, after the pole piece 100 passes through the drying of the first drying chamber, the second drying chamber and the third drying chamber, the adjustment of the wind speed in combination with the conditions of the wind speed can sufficiently inhibit the binder in the interior of the coating 101, further improve the adhesion of the coating 101, and more effectively improve the problem of the pole piece 100 falling off.

[0034] It should be noted that the minimum temperature, the higher temperature and the maximum temperature are the expressions of the temperature comparison among the first temperature, the second temperature and the third temperature. Specifically, in some examples, the first temperature can be 112-118℃, the second temperature can be 97-103℃, and the third temperature can be 127-133℃. In addition, the minimum wind speed, the higher wind speed and the maximum wind speed are the definitions of the temperature comparison among the first temperature, the second temperature and the third temperature. In some examples, the wind speed of the first rotating speed can be set to the wind speed generated by the first fan assembly when it reaches 80-85% of its rated power, the wind speed of the second rotating speed can be set to the wind speed generated by the second fan assembly when it reaches 70-75% of its rated power, and the wind speed of the third rotating speed can be set to the wind speed generated by the second fan assembly when it reaches 85-90% of its rated power. The rated powers of the first fan assembly, the second fan assembly and the third fan assembly are all equal.

[0035] In some embodiments, the pole piece drying device includes a plurality of ovens 4, each oven 4 having a drying cavity; the preheating device 1 includes a plurality of ovens 4, the drying cavities of the plurality of ovens 4 of the preheating device 1 are sequentially communicated to form a first drying chamber; the constant-speed device 2 includes a plurality of ovens 4, the drying cavities of the plurality of ovens 4 of the constant-speed device 2 are sequentially communicated to form a second drying chamber; the speed-reducing device 3 includes one oven 4, the drying cavity of the oven 4 of the speed-reducing device 3 forms a third drying chamber, or the speed-reducing device 3 includes a plurality of ovens 4, the drying cavities of the plurality of ovens 4 of the speed-reducing device 3 are sequentially communicated to form a third drying chamber; wherein the number of ovens 4 of the preheating device 1 is greater than the number of ovens 4 of the speed-reducing device 3, and the number of ovens 4 of the constant-speed device 2 is greater than the number of ovens 4 of the speed-reducing device 3. Thus, when the pole piece 100 is uniformly conveyed to the first drying chamber, the second drying chamber and the third drying chamber, the pole piece 100 stays in the first drying chamber, the second drying chamber and the third drying chamber for different lengths of time, so that the pole piece 100 can be dried for different lengths of time and to different degrees in different stages, thereby avoiding over-drying and improving the drying quality of the pole piece 100.

[0036] In some embodiments, the preheating device 1 includes two ovens 4, the constant-speed device 2 includes two ovens 4, and the constant-speed device 2 includes one oven 4. Thus, the pole piece drying device can include five ovens 4. When the pole piece 100 is uniformly conveyed to the first drying chamber, the second drying chamber and the third drying chamber, the pole piece 100 stays in the first drying chamber and the second drying chamber for a longer time and stays in the third drying chamber for a shorter time, thereby avoiding over-drying and improving the drying quality of the pole piece 100.

[0037] In some embodiments, the preheating device 1 includes three ovens 4, the constant speed device 2 includes three ovens 4, and the constant speed device 2 includes two ovens 4. Thus, the pole piece drying device can include eight ovens 4. When the pole piece 100 is uniformly conveyed to the first drying chamber, the second drying chamber, and the third drying chamber, the pole piece 100 stays in the first drying chamber and the second drying chamber for a longer time and stays in the third drying chamber for a shorter time, thereby avoiding the phenomenon of over-drying and better improving the drying quality of the pole piece 100.

[0038] With reference to Figure 2 and Figure 3 In some embodiments, the top of the oven 4 is provided with two air inlets 41 and an air outlet 42, and the bottom of the oven 4 is provided with one air inlet 41. Thus, when the pole piece drying device is working, the hot air temperature inside the oven 4 is high, and the hot air will naturally rise, so placing the air outlet 42 at the top of the oven 4 helps to effectively exhaust the hot air, promote air circulation, and improve drying efficiency. In addition, with reference to Figure 2 , the pole piece 100 is in the middle of the oven 4 during drying, which is similar to dividing the inside of the oven 4 into two spaces above and below. The top of the oven 4 is provided with two air inlets 41 and an air outlet 42, and the bottom of the oven 4 is provided with one air inlet 41. In this way, the air pressure on the upper and lower sides of the pole piece 100 can be balanced. Specifically, the bottom of the oven 4 is provided with one air inlet 41, and although the top of the oven 4 is provided with two air inlets 41, it is also provided with one air outlet 42, so that the air pressure on the upper and lower sides of the pole piece 100 is balanced. Otherwise, if the air pressure on the upper and lower sides of the pole piece 100 is unbalanced, the pole piece 100 is likely to bulge to one side, and the pole piece 100 is likely to deform.

[0039] In some examples, the first fan assembly can include a wind box, a fan arranged in the wind box, and a pipeline, wherein the wind box is arranged outside the oven 4, and the wind box is connected to the air inlet 41 of the oven 4 through the pipeline. The pipeline can be provided with an electric heating wire, and the fan blows air towards the electric heater, so that the hot air is blown into the oven 4 through the pipeline. The second fan assembly and the third fan assembly can also have a similar structure as the first fan assembly, but the fan speed and the temperature of the electric heating wire of the second fan assembly are different from those of the first fan assembly, and the fan speed and the temperature of the electric heating wire of the third fan assembly are also different from those of the first fan assembly.

[0040] With reference to Figure 1 and Figure 2In some embodiments, the pole piece drying device further comprises a connecting piece 5, the connecting piece 5 is provided with a connecting cavity; the connecting piece 5 connects two adjacent drying ovens 4, and the connecting cavity is in communication with the two adjacent drying cavities; wherein, in a vertical plane perpendicular to the horizontal plane, the cross-sectional area of the connecting piece 5 is smaller than the cross-sectional area of the drying oven 4. Thus, the two adjacent drying ovens 4 are connected by the connecting piece 5, and since the connecting cavity is smaller than the drying cavity, the hot air in the drying cavity is not easy to flow through the connecting cavity, so the temperature of the two adjacent drying cavities does not easily interfere with each other. In some examples, the cross-section of the connecting piece 5 can be slightly larger than the cross-section of the pole piece 100, so that the space size of the connecting cavity can provide the pole piece 100 to pass through.

[0041] Referring to Figure 2 In some embodiments, the pole piece drying device comprises a conveying mechanism 6, the conveying mechanism 6 is provided from the first drying chamber to the third drying chamber, and the conveying mechanism 6 is used to uniformly convey the pole piece 100 along the first drying chamber, the second drying chamber and the third drying chamber; and / or, the conveying mechanism 6 comprises a plurality of conveying rollers 61, the plurality of conveying rollers 61 are used to carry the pole piece 100, and two adjacent conveying rollers 61 are spaced apart. Wherein, the conveying roller 61 can rotate around its own axis, and the plurality of conveying rollers 61 rotate towards the same direction to form a structure similar to a conveying belt, and the top of the conveying roller 61 can also be at the same horizontal plane as the feeding port and the discharging port. The pole piece 100 can be directly placed on the conveying roller 61 and then conveyed to the discharging port by the conveying roller 61. Thus, the arrangement of the conveying roller 61 can make the pole piece 100 partially suspended, thereby facilitating the hot air to blow to both sides of the pole piece 100 and improving the drying efficiency.

[0042] In some embodiments, the ratio of the length of the preheating device 1 to the length of the pole piece drying device is between 37.5%-40%; the ratio of the length of the constant speed device 2 to the length of the pole piece drying device is between 37.5%-40%; and the ratio of the length of the deceleration device 3 to the length of the pole piece drying device is between 20%-25%. Thus, the pole piece 100 conveyed at a constant speed can have a longer drying time in the preheating device 1 and the constant speed device 2, and a shorter drying time in the deceleration device 3. For example, when the preheating device 1, the constant speed device 2 and the deceleration device 3 are each composed of several drying ovens 4, the pole piece drying device can include a total of five drying ovens 4, and the total length of the drying ovens 4 can be 25 meters. The preheating device 1 can be the first two drying ovens 4, with a length of 10 meters, accounting for 40% of the total length; the constant speed device 2 can be the middle two drying ovens 4, with a length of 10 meters, accounting for 40% of the total length; and the deceleration device 3 can be the last drying oven 4, with a length of 5 meters, accounting for 20% of the total length. Of course, the pole piece drying device is not limited to five drying ovens 4, and can be any integer value between 5-8 drying ovens 4, or even 10 or more drying ovens 4.

[0043] To sum up, the pole piece drying equipment involved in the present application can dry the pole piece in three stages. Since the pole piece 100 stays in the first drying chamber, the second drying chamber and the third drying chamber for different lengths of time, the pole piece 100 can be better dried in different stages. Accordingly, the pole piece drying equipment can better dry the pole piece 100 in different stages, thereby improving the drying quality of the pole piece 100.

[0044] In the description of the present application, the terms "first", "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0045] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0046] The embodiments, implementation manners and related technical features of the present application can be combined and replaced with each other without conflict.

[0047] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made according to the technical essence of the present application without departing from the technical solution content of the present application, all still fall within the scope of the technical solution of the present application.

[0048] Although the present application has been specifically described above in combination with the drawings and embodiments, it can be understood that the above description does not limit the present application in any form. Those skilled in the art can deform and change the present application according to the needs without deviating from the essential spirit and scope of the present application, and these deformations and changes all fall within the scope of the present application.

Claims

1. A pole piece drying device, characterized in that: include: A preheating device having a first drying chamber therein; A constant speed device having a second drying chamber therein, wherein the second drying chamber is connected to the first drying chamber; A deceleration device is provided with a third drying chamber inside, the constant speed device is arranged between the preheating device and the deceleration device, and the third drying chamber is communicated with the second drying chamber; The electrode is transported from the first drying chamber to the third drying chamber at a uniform speed, and along the transport direction, the lengths of the first drying chamber, the second drying chamber and the third drying chamber are different.

2. The electrode drying equipment according to claim 1, characterized in that: The electrode drying equipment further includes a first fan assembly connected to the preheating device, a second fan assembly connected to the constant speed device, and a third fan assembly connected to the speed reduction device; The wind speeds of the first fan assembly, the second fan assembly, and the third fan assembly are different.

3. The electrode drying equipment according to claim 2, characterized in that: The rotational speed of the first fan assembly is a first rotational speed, the rotational speed of the second fan assembly is a second rotational speed, and the rotational speed of the third fan assembly is a third rotational speed. The second rotational speed, the first rotational speed, and the third rotational speed increase in sequence.

4. The electrode drying equipment according to claim 1, characterized in that: The temperature in the first drying chamber is a first temperature, the temperature in the second drying chamber is a second temperature, and the temperature in the third drying chamber is a third temperature; The second temperature is lower than the first temperature, and the first temperature is lower than the third temperature.

5. The electrode drying equipment according to any one of claims 1 to 4, characterized in that: The electrode drying equipment includes a plurality of ovens, each of which has a drying chamber; The preheating device comprises a plurality of ovens, and the drying chambers of the plurality of ovens of the preheating device are sequentially connected to form the first drying chamber; The constant speed device comprises a plurality of the ovens, and the drying chambers of the plurality of ovens of the constant speed device are sequentially connected to form the second drying chamber; The deceleration device includes an oven, and the drying cavity of the oven of the deceleration device forms the third drying chamber, or the deceleration device includes multiple ovens, and the drying cavities of the multiple ovens of the deceleration device are sequentially connected to form the third drying chamber; The number of the ovens in the preheating device is greater than the number of the ovens in the speed reduction device, and the number of the ovens in the constant speed device is greater than the number of the ovens in the speed reduction device.

6. The electrode drying equipment according to claim 5, characterized in that: The preheating device includes two of the ovens, the constant speed device includes two of the ovens, and the constant speed device includes one of the ovens; or The preheating device includes three of the ovens, the constant speed device includes three of the ovens, and the constant speed device includes two of the ovens.

7. The electrode drying equipment according to claim 5, characterized in that: The top of the oven is provided with two air inlets and an air outlet; the bottom of the oven is provided with an air inlet.

8. The electrode drying equipment according to claim 5, characterized in that: The electrode drying equipment further comprises a connecting piece, wherein a connecting cavity is provided in the connecting piece; The connecting piece connects the two adjacent ovens, and the connecting cavity is in communication with the two adjacent drying cavities; Wherein, on a vertical plane perpendicular to the horizontal plane, the cross-sectional area of ​​the connecting member is smaller than the cross-sectional area of ​​the oven.

9. The electrode drying equipment according to any one of claims 1 to 4, characterized in that: The electrode drying equipment includes a conveying mechanism, which is arranged from the first drying chamber to the third drying chamber, and is used to convey the electrode along the first drying chamber, the second drying chamber, and the third drying chamber at a uniform speed; and / or, The conveying mechanism includes a plurality of conveying rollers, which are used to carry the pole pieces, and adjacent conveying rollers are spaced apart.

10. The electrode drying equipment according to any one of claims 1 to 4, characterized in that: The ratio of the length of the preheating device to the length of the electrode drying equipment is between 37.5% and 40%; The ratio of the length of the constant speed device to the length of the electrode drying equipment is between 37.5% and 40%; The ratio of the length of the speed reduction device to the length of the electrode drying equipment is between 20% and 25%.

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