Humidifying and leveling device and pole piece production equipment

Abstract

The utility model provides a humidifying and leveling device and pole piece production equipment. The humidifying and leveling device comprises a rack, wherein a pole piece conveying channel is formed in the rack; the humidifying and leveling device further comprises an atomizing and humidifying mechanism, a rolling and leveling mechanism and a baking mechanism which are sequentially arranged on the rack along the pole piece conveying channel. The atomizing and humidifying mechanism comprises an atomizing assembly and a humidifying box, the humidifying box is provided with a steam inlet and a humidifying cavity which are communicated, the output end of the atomizing assembly is communicated with the humidifying cavity through the steam inlet, the humidifying box is further provided with a pole piece inlet and a pole piece outlet, and the pole piece inlet and the pole piece outlet are both communicated with the humidifying cavity. The pole piece conveying channel sequentially passes through the pole piece inlet, the humidifying cavity and the pole piece outlet; and the rolling and leveling mechanism is used for rolling and leveling the pole piece. The humidifying and leveling device not only can effectively solve the problem that a single-face area of the pole piece is curled and folded, but also can effectively solve the problem that powder adheres to a roller when the pole piece is rolled and leveled.

Description

Technical Field

[0001] The present disclosure relates to the technical field of pole piece production equipment, and particularly relates to a humidifying and flattening device and a pole piece production equipment. Background Art

[0002] Currently, with the continuous progress of technology, lithium batteries, as an efficient and environmentally friendly energy storage technology, have been widely used in various fields. However, with the continuous development and progress of lithium battery manufacturing technology, the energy density of lithium battery cells is getting higher and higher, and the substrate is tending to be thinner, resulting in an increasing compaction density of the pole piece (such as the switch from a 5um copper foil to a 4um copper foil for the negative electrode, and the compaction density increases from 1.75 g / cm 3 to 1.78 g / cm 3 etc.), which causes the single-sided area of the pole piece to quickly curl towards the light foil surface under the action of stress after winding and cutting. This abnormality not only affects the winding yield and efficiency, but also causes the phenomenon of curling and folding of the single-sided area in the inner circle of the winding core. The folded area will undergo lithium precipitation during the subsequent charge and discharge cycles, and with the accumulation of lithium dendrites, it is easy to cause a short circuit in the lithium battery, posing a great potential safety hazard.

[0003] Therefore, one of the existing technologies proposes to stick adhesive paper on the single-sided area of the pole piece. Although it increases the rigidity of the foil material in the single-sided area of the pole piece and alleviates the curling and folding phenomenon caused by stress concentration in the single-sided area, sticking adhesive paper on the single-sided area accumulates the thickness of the winding core in the thickness direction, resulting in a lower energy density of the battery cell; in addition, this method cannot completely solve the abnormality of stress concentration and curling or even folding in the single-sided area; at the same time, there is also an existing technology that proposes to roll the pole piece with a roller. Although it alleviates the curling and folding phenomenon caused by stress concentration in the single-sided area to a certain extent, powder will fall off when the roller rolls the pole piece, causing the powder to adhere to the rolling surface of the roller. When the roller rolls the pole piece, the powder adhered to the rolling surface of the roller is pressed onto the surface of the pole piece. This phenomenon is called "pole piece inclusion", which further causes the pole piece segments with the "pole piece inclusion" problem to be removed in the subsequent process, resulting in waste of the pole piece, and there is still the phenomenon of stress concentration and curling or folding in the single-sided area. Summary of the Utility Model

[0004] The purpose of the present disclosure is to overcome the deficiencies in the prior art and provide a humidifying and flattening device and a pole piece production equipment that can not only effectively solve the curling and folding phenomenon caused by stress concentration in the single-sided area, but also effectively solve the phenomenon of powder sticking to the roller during the rolling and flattening process of the pole piece.

[0005] The purpose of the present disclosure is achieved through the following technical solutions:

[0006] A humidifying and flattening device, comprising:

[0007] A frame, and a pole piece conveying channel is formed on the frame;

[0008] The humidifying and flattening device further includes an atomizing and humidifying mechanism, a rolling and flattening mechanism, and a baking mechanism that are sequentially arranged on the frame along the pole piece conveying channel;

[0009] The atomizing and humidifying mechanism is used to perform atomizing and humidifying operations on the pole piece. The atomizing and humidifying mechanism includes an atomizing component and a humidifying box. The humidifying box is provided with a steam inlet and a humidifying chamber that are communicated with each other. The output end of the atomizing component is communicated with the humidifying chamber through the steam inlet. The humidifying box is further provided with a pole piece inlet and a pole piece outlet, and both the pole piece inlet and the pole piece outlet are communicated with the humidifying chamber. The pole piece conveying channel sequentially passes through the pole piece inlet, the humidifying chamber, and the pole piece outlet;

[0010] The rolling and flattening mechanism is used to perform rolling and flattening operations on the pole piece; and

[0011] The baking mechanism is used to perform baking operations on the pole piece.

[0012] In one embodiment, the atomizing component includes a humidifier and a transmission pipeline. The humidifier is installed and fixed on the frame, and the atomizing output port of the humidifier is communicated with the steam inlet through the transmission pipeline. The humidifier is used to generate atomized gas.

[0013] In one embodiment, the humidifying box includes a box body and an upper cover. The box body is installed and fixed on the frame. The box body is provided with a humidifying groove. One end of the upper cover is rotatably connected to the box body, and the upper cover covers the notch of the humidifying groove to jointly form the humidifying chamber; both the pole piece inlet and the pole piece outlet are opened on the box body; the box body is provided with an installation port communicated with the humidifying groove, and one end of the transmission pipeline is located in the steam inlet and is hermetically connected to the box body.

[0014] In one embodiment, the transmission pipeline includes a main pipeline and two branch pipelines. The main pipeline is communicated with the atomizing output port of the humidifier; one end of each branch pipeline is communicated with the main pipeline, and the other end is communicated with the steam inlet.

[0015] In one embodiment, the steam outlet direction of the end where the output end of the atomizing component is communicated with the steam inlet is perpendicular to the transmission direction of the pole piece passing through the humidifying chamber.

[0016] In one embodiment, the humidifying box further includes a humidifying filter screen. The humidifying filter screen is installed and fixed in the humidifying chamber, and the humidifying filter screen is correspondingly arranged with the steam inlet.

[0017] In one embodiment, the rolling and leveling mechanism includes a first pair of rollers and a second pair of rollers, and the first pair of rollers and the second pair of rollers are oppositely arranged on both sides of the pole piece conveying channel.

[0018] In one embodiment, the conveying speed of the pole piece passing through the rolling and leveling mechanism is equal to the conveying speed of the pole piece passing through the atomizing and humidifying mechanism.

[0019] In one embodiment, the conveying speed of the pole piece passing through the atomizing and humidifying mechanism is 30 m / min to 50 m / min.

[0020] In one embodiment, the conveying speed of the pole piece passing through the rolling and leveling mechanism is equal to the conveying speed of the pole piece passing through the baking mechanism.

[0021] In one embodiment, the baking mechanism includes an oven through-frame, a set of passing rollers, and far-infrared heating plates. The oven through-frame is arranged on the frame. The set of passing rollers is movably arranged in the oven through-frame to form a pole piece baking channel. The pole piece baking channel is communicated with the pole piece conveying channel. The far-infrared heating plates are arranged in the oven through-frame, and the far-infrared heating plates are used to bake the pole piece passing through the pole piece baking channel.

[0022] In one embodiment, the conveying speed of the pole piece passing through the rolling and leveling mechanism is equal to the conveying speed of the pole piece passing through the baking mechanism.

[0023] In one embodiment, the set of passing rollers includes an upper set of passing rollers and a lower set of passing rollers. The upper set of passing rollers includes a plurality of upper passing rollers that are movably arranged side by side in the oven through-frame. The lower set of passing rollers includes a plurality of lower passing rollers that are movably arranged side by side in the oven through-frame. Each upper passing roller is staggeredly arranged with the adjacent lower passing roller and is chain-driven.

[0024] In one embodiment, the set of passing rollers further includes a driving member, a set of driving sprockets, and two transmission chains. The driving member is installed on the frame. The set of driving sprockets is rotatably connected to the frame. The driving shaft of the driving member is connected to one end of the set of driving sprockets. Two driving sprockets are respectively arranged at both ends of the set of driving sprockets. Upper driven sprockets are respectively arranged at both ends of the upper passing rollers. Lower driven sprockets are respectively arranged at both ends of the lower passing rollers. Each transmission chain is sequentially meshed with the corresponding driving sprocket, the corresponding upper driven sprocket, and the corresponding lower driven sprocket.

[0025] A pole piece production device includes the humidifying and leveling device described in any of the above embodiments.

[0026] Compared with the prior art, the present disclosure includes but is not limited to the following advantages:

[0027] 1. For the above humidifying and flattening device, since the rack is provided with a pole piece conveying channel, the humidifying and flattening device further includes an atomizing and humidifying mechanism, a rolling and flattening mechanism, and a baking mechanism that are sequentially arranged along the pole piece conveying channel on the rack, so that the pole piece is conveyed through the pole piece conveying channel into the atomizing and humidifying mechanism for humidifying and softening, enabling the pole piece to release stress after humidifying and softening. Then, the pole piece after humidifying and softening is conveyed through the pole piece conveying channel into the rolling and flattening mechanism for rolling and flattening. Thus, the humidifying and flattening device can effectively solve the problem of curling and folding in the single-sided area of the pole piece, not only improving the winding yield and efficiency of the pole piece, but also greatly enhancing the safety of the lithium battery during later charge and discharge cycles.

[0028] 2. Since the humidifying box is provided with a steam inlet and a humidifying chamber that are connected, the output end of the atomizing assembly is connected to the humidifying chamber through the steam inlet. The humidifying box is also provided with a pole piece inlet and a pole piece outlet, both of which are connected to the humidifying chamber. The pole piece conveying channel passes through the pole piece inlet, the humidifying chamber, and the pole piece outlet in sequence. The rolling and flattening mechanism is used to perform rolling and flattening operations on the pole piece, enabling the output end of the atomizing assembly to input the atomized softening agent into the humidifying chamber through the steam inlet, making the entire humidifying chamber filled with the atomized softening agent. When the pole piece is conveyed through the pole piece conveying channel into the humidifying chamber, the atomizing assembly can uniformly humidify the pole piece, greatly improving the humidifying uniformity of the pole piece. At the same time, after the pole piece is humidified, the adhesion between the powder on the pole piece and the surface of the pole piece is improved, enabling the humidifying and flattening device to effectively solve the problem of easy powder dropping on the pole piece. When the pole piece is humidified to the optimal humidity, the adhesion between the powder on the pole piece and the surface of the pole piece is greater than the adhesion to the rolling surface of the rolling and flattening mechanism, enabling the humidifying and flattening device to effectively solve the problem of easy powder sticking to the roller during the rolling and flattening process of the pole piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present disclosure and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0030] Figure 1 Structural schematic diagram of a humidifying and flattening device according to an embodiment;

[0031] Figure 2 For Figure 1 Internal structural schematic diagram of the humidifying and flattening device shown;

[0032] Figure 3 For Figure 1 Partial structural schematic diagram of the humidifying and flattening device shown;

[0033] Figure 4 is Figure 1 An exploded schematic view of a partial structure of the humidifying and leveling device shown;

[0034] Figure 5 is Figure 1 Another schematic view of a partial structure of the humidifying and leveling device shown;

[0035] Figure 6 is Figure 1 Yet another schematic view of a partial structure of the humidifying and leveling device shown;

[0036] Figure 7 is Figure 6 An enlarged schematic view of a part of the humidifying and leveling device shown. Detailed implementation manners

[0037] To facilitate the understanding of the present disclosure, the present disclosure will be described more comprehensively below with reference to the relevant drawings. Preferred embodiments of the present disclosure are shown in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided so that the disclosure of the present disclosure can be understood more thoroughly and comprehensively.

[0038] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present disclosure belongs. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0040] As Figures 1 to 4As shown in the figure, in one embodiment, the humidifying and leveling device 10 includes a frame 100, and the frame 100 is provided with a pole piece conveying channel 110; the humidifying and leveling device 10 further includes an atomizing and humidifying mechanism 200, a rolling and leveling mechanism 300, and a baking mechanism 400 that are sequentially arranged on the frame 100 along the pole piece conveying channel 110, so that the pole piece 500 is first conveyed into the atomizing and humidifying mechanism 200 for humidifying and softening, so that the pole piece 500 can release stress after being humidified and softened, and the pole piece 500 after being humidified and softened is then conveyed into the rolling and leveling mechanism 300 for rolling and leveling, so that the humidifying and leveling device 10 can effectively solve the problem of curling and folding in the single-sided area of the pole piece 500, not only improving the winding yield and efficiency of the pole piece 500, but also greatly improving the safety of the lithium battery during later charge and discharge cycles.

[0041] As Figures 1 to 4 shown, further, the atomizing and humidifying mechanism 200 is used to perform atomizing and humidifying operations on the pole piece 500. The atomizing and humidifying mechanism 200 includes an atomizing component 210 and a humidifying box 220. The humidifying box 220 is provided with a steam inlet 221 and a humidifying chamber 222 that are connected. The output end of the atomizing component 210 is connected to the humidifying chamber 222 through the steam inlet 221. The humidifying box 220 is also provided with a pole piece inlet 223 and a pole piece outlet 224. The pole piece inlet 223 and the pole piece outlet 224 are both connected to the humidifying chamber 222. The pole piece conveying channel 110 sequentially passes through the pole piece inlet 223, the humidifying chamber 222, and the pole piece outlet 224; the rolling and leveling mechanism 300 is used to perform rolling and leveling operations on the pole piece 500; the baking mechanism 400 is used to perform baking operations on the pole piece 500, so that the output end of the atomizing component 210 can input the atomized softening agent into the humidifying chamber 222 through the steam inlet 221, so that the entire humidifying chamber 222 is filled with the atomized softening agent. When the pole piece 500 is conveyed into the humidifying chamber 222 through the pole piece conveying channel 110, the atomizing component 210 can uniformly humidify the pole piece 500, greatly improving the humidifying uniformity of the pole piece 500. At the same time, after the pole piece 500 is humidified, the adhesion between the powder on the pole piece 500 and the surface of the pole piece 500 is improved, so that the humidifying and leveling device 10 can effectively solve the problem of easy powder dropping of the pole piece 500; when the pole piece 500 is humidified to the optimal humidifying humidity, the adhesion between the powder on the pole piece 500 and the surface of the pole piece 500 is greater than the adhesion to the rolling surface of the rolling and leveling mechanism 300, so that the humidifying and leveling device 10 can effectively solve the problem of easy powder sticking to the roller during the rolling and leveling process of the pole piece 500; and the baking mechanism 400 can also bake and dry the pole piece 500.

[0042] In this embodiment, before starting the humidifying and flattening device 10, first perform the manual threading operation. Manually place the electrode sheet 500 along the electrode sheet conveying channel 110 in the humidifying and flattening device 10. Then, after the threading operation of the electrode sheet 500 is completed, turn on the humidifying and flattening device 10. The atomization assembly 210 sprays the atomized softening agent liquid into the humidifying chamber 222 so that the humidifying chamber 222 is filled with the atomized softening agent. Then, convey the electrode sheet 500 along the electrode sheet conveying channel 110 into the humidifying chamber 222 for humidifying and softening. Finally, the electrode sheet 500 after humidifying and softening is successively conveyed along the electrode sheet conveying channel 110 into the rolling and flattening mechanism 300 and the baking mechanism 400 for rolling and flattening and baking and drying respectively, and the electrode sheet 500 after baking and drying is collected.

[0043] For the above-mentioned humidifying and flattening device 10, since the frame 100 is provided with the electrode sheet conveying channel 110, the humidifying and flattening device 10 further includes an atomizing and humidifying mechanism 200, a rolling and flattening mechanism 300 and a baking mechanism 400 which are successively arranged along the electrode sheet conveying channel 110 on the frame 100, so that the electrode sheet 500 is conveyed through the electrode sheet conveying channel 110 into the atomizing and humidifying mechanism 200 for humidifying and softening, enabling the electrode sheet 500 to release stress after humidifying and softening. Then, the electrode sheet 500 after humidifying and softening is conveyed through the electrode sheet conveying channel 110 into the rolling and flattening mechanism 300 for rolling and flattening. Thus, the humidifying and flattening device 10 can effectively solve the problem of curling and folding in the single-sided area of the electrode sheet 500, not only improving the winding yield and efficiency of the electrode sheet 500, but also greatly enhancing the safety of the lithium battery during later charge and discharge cycles.

[0044] Since the humidifying box 220 is provided with a steam inlet 221 and a humidifying chamber 222 that are connected and communicate with each other, the output end of the atomization assembly 210 is connected and communicates with the humidifying chamber 222 through the steam inlet 221. The humidifying box 220 is further provided with a pole piece inlet 223 and a pole piece outlet 224, and both the pole piece inlet 223 and the pole piece outlet 224 communicate with the humidifying chamber 222. The pole piece transmission channel 110 sequentially passes through the pole piece inlet 223, the humidifying chamber 222, and the pole piece outlet 224. The rolling and leveling mechanism 300 is used to perform rolling and leveling operations on the pole piece 500, so that the output end of the atomization assembly 210 can input the atomized softening agent into the humidifying chamber 222 through the steam inlet 221, making the entire humidifying chamber 222 filled with the atomized softening agent. When the pole piece 500 is transmitted to the humidifying chamber 222 through the pole piece transmission channel 110, the atomization assembly 210 can uniformly humidify the pole piece 500, greatly improving the humidifying uniformity of the pole piece 500. At the same time, after the pole piece 500 is humidified, the adhesion between the powder on the pole piece 500 and the surface of the pole piece 500 is improved, enabling the humidifying and leveling device 10 to effectively solve the problem that the pole piece 500 is prone to powder dropping. When the pole piece 500 is humidified to the optimal humidifying humidity, the adhesion between the powder on the pole piece 500 and the surface of the pole piece 500 is greater than the adhesion with the rolling surface of the rolling and leveling mechanism 300, enabling the humidifying and leveling device 10 to effectively solve the problem that the powder on the pole piece 500 is prone to sticking to the roller during the rolling and leveling process.

[0045] As Figures 1 to 4 shown, in one embodiment, the atomization assembly 210 includes a humidifier 211 and a transmission pipeline 212. The humidifier 211 is installed and fixed on the frame 100. The atomization output port of the humidifier 211 is connected to the steam inlet 221 through the transmission pipeline 212. The humidifier 211 is used to generate atomized gas, so that the atomization output port of the humidifier 211 can transport the atomized softening agent into the humidifying chamber 222 through the transmission pipeline 212, enabling the humidifying and leveling device 10 to humidify and soften the pole piece 500.

[0046] As Figures 1 to 4As shown, in one embodiment, the humidifying box 220 includes a box body 225 and an upper cover 226. The box body 225 is fixedly installed on the frame 100. The box body 225 is provided with a humidifying groove 225a. One end of the upper cover 226 is rotatably connected to the box body 225, and the upper cover 226 covers the notch of the humidifying groove 225a to jointly form a humidifying cavity 222. The pole piece inlet 223 and the pole piece outlet 224 are both provided on the box body 225. The box body 225 is provided with an installation opening communicating with the humidifying groove 225a. One end of the transmission pipeline 212 is located in the steam inlet 221 and is hermetically connected to the box body 225. When manually threading the pole piece 500, the upper cover 226 can be rotated in the first direction to open the humidifying cavity 222, making it more convenient and fast to manually thread the pole piece 500 through the pole piece inlet 223, the humidifying cavity, and the pole piece outlet 224 in sequence. After the manual threading operation is completed, the upper cover 226 is rotated in the second direction to close the humidifying cavity 222, so as to improve the sealing effect in the humidifying cavity 222 and prevent the atomized gas in the humidifying cavity 222 from having too large a contact area with the outside world, resulting in too fast a decrease rate of the atomized gas concentration in the humidifying cavity 222. Further, the upper cover 226 is rotatably connected to the box body 225 through a hinge.

[0047] As Figures 3 to 4 shown, in one embodiment, the transmission pipeline 212 includes a main pipeline 212a and two branch pipelines 212b. The main pipeline 212a is communicated with the atomizing output port of the humidifier 211. One end of each branch pipeline 212b is communicated with the main pipeline 212a, and the other end is communicated with the steam inlet 221 to accelerate the output rate of the atomized gas and prevent the atomized gas concentration in the humidifying cavity 222 from decreasing too fast.

[0048] As Figures 2 to 4 shown, in one embodiment, the output end of the atomizing assembly 210 is communicated with the steam inlet 221, and the steam outlet direction at the end of the steam inlet 221 is perpendicular to the transmission direction of the pole piece 500 passing through the humidifying cavity 222, so that the atomized gas can be directly sprayed onto the pole piece 500 through the steam inlet 221, thereby improving the humidifying rate of the pole piece 500.

[0049] As Figures 2 to 4 shown, in one embodiment, the humidifying box 220 further includes a humidifying filter screen 227. The humidifying filter screen 227 is fixedly installed in the humidifying cavity 222 and is correspondingly arranged with the steam inlet 221 to prevent the transmission pipeline 212 from spraying the atomized gas mixed with foreign matters onto the surface of the pole piece 500 through the steam inlet 221, causing foreign matters to adhere to the surface of the pole piece 500. Then, during the rolling process, the rolling and leveling mechanism 300 presses the foreign matters on the surface of the pole piece 500 into the pole piece 500, resulting in waste of the pole piece 500 in subsequent processes.

[0050] AsFigures 1 to 2 As shown, in one embodiment, the rolling and leveling mechanism 300 includes a first pair of rollers 310 and a second pair of rollers 320. The first pair of rollers 310 and the second pair of rollers 320 are oppositely arranged on both sides of the electrode sheet conveying channel 110, so as to form a rolling area between the first pair of rollers 310 and the second pair of rollers 320. When the electrode sheet 500 after humidification and softening passes through the rolling area, the rolling and leveling mechanism 300 can roll and level the electrode sheet 500.

[0051] As Figures 1 to 2 shown, in one embodiment, the conveying speed of the electrode sheet passing through the rolling and leveling mechanism 300 is equal to the conveying speed of the electrode sheet passing through the atomizing humidifying mechanism 200 to ensure the atomizing humidifying and softening effect of the electrode sheet 500.

[0052] As Figures 1 to 2 shown, in one embodiment, the conveying speed of the electrode sheet passing through the atomizing humidifying mechanism 200 is 30 m / min to 50 m / min, so as to ensure a good humidifying effect when the electrode sheet 500 passes through the atomizing humidifying mechanism 200.

[0053] As Figures 1 to 2 shown, in one embodiment, the conveying speed of the electrode sheet passing through the rolling and leveling mechanism 300 is equal to the conveying speed of the electrode sheet passing through the baking mechanism 400, so as to ensure a good drying effect when the electrode sheet 500 passes through the atomizing humidifying mechanism 200.

[0054] As Figures 5 to 7 shown, in one embodiment, the baking mechanism 400 includes an oven through-frame 410, a roller group 420 and a far-infrared heating plate 430. The oven through-frame 410 is arranged on the frame 100. The roller group 420 is movably arranged in the oven through-frame 410 to form an electrode sheet baking channel 411. The electrode sheet baking channel 411 is communicated with the electrode sheet conveying channel 110, so that the electrode sheet 500 can be conveyed from the electrode sheet conveying channel 110 into the electrode sheet baking channel 411 through the roller group 420. The far-infrared heating plate 430 is arranged in the oven through-frame 410. The far-infrared heating plate 430 is used to bake the electrode sheet 500 passing through the electrode sheet baking channel 411, so that when the electrode sheet 500 after humidification, softening and rolling and leveling enters the electrode sheet baking channel 411, the baking mechanism 400 can quickly bake and dry the electrode sheet 500.

[0055] As Figures 5 to 7As shown, in one embodiment, the over-roller group 420 includes an upper over-roller group 421 and a lower over-roller group 422. The upper over-roller group 421 includes a plurality of upper over-rollers 4211 arranged side by side and movably within the oven through-frame 410. The lower over-roller group 422 includes a plurality of lower over-rollers 4221 arranged side by side and movably within the oven through-frame 410. Each upper over-roller 4211 is staggeredly arranged with an adjacent lower over-roller 4221 and is chain-driven, so that the rotational speeds of each upper over-roller 4211 and each lower over-roller 4221 are equal, ensuring a better drying effect during the conveyance of the electrode sheet 500.

[0056] As Figures 5 to 7 shown, in one embodiment, the over-roller group 420 further includes a driving member 423, a driving sprocket group 424, and two transmission chains 425. The driving member 423 is installed on the frame 100. The driving sprocket group 424 is rotatably connected to the frame 100. The driving shaft of the driving member 423 is connected to one end of the driving sprocket group 424, enabling the driving member 423 to drive the driving sprocket group 424 to rotate. Two driving sprockets 424a are respectively provided at both ends of the driving sprocket group 424. Upper driven sprockets 4211a are respectively provided at both ends of the upper over-roller 4211. Lower driven sprockets 4221a are respectively provided at both ends of the lower over-roller 4221. Each transmission chain 425 is respectively meshed with the corresponding driving sprocket 424a, the corresponding upper driven sprocket 4211a, and the corresponding lower driven sprocket 4221a in sequence, enabling the driving sprocket 424a to drive the driven sprockets to rotate through the transmission chain 425, so that the over-roller group 420 can convey the electrode sheet 500 from the entrance of the electrode sheet baking channel 411 to the exit.

[0057] The present disclosure also provides a production device for electrode sheets, including the humidifying and flattening device 10 of any one of the above embodiments.

[0058] Compared with the prior art, the present disclosure has at least the following advantages:

[0059] 1. For the above-mentioned production device for electrode sheets, since the frame 100 is provided with an electrode sheet transmission channel 110, the humidifying and flattening device 10 further includes an atomizing humidifying mechanism 200, a roll pressing and flattening mechanism 300, and a baking mechanism 400 sequentially arranged along the electrode sheet transmission channel 110 on the frame 100, enabling the electrode sheet 500 to be conveyed into the atomizing humidifying mechanism 200 through the electrode sheet transmission channel 110 for humidifying and softening, so that the electrode sheet 500 can release stress after being humidified and softened. Then, the humidified and softened electrode sheet 500 is conveyed into the roll pressing and flattening mechanism 300 through the electrode sheet transmission channel 110 for roll pressing and flattening. Furthermore, the humidifying and flattening device 10 can effectively solve the problem of curling and folding in the single-sided area of the electrode sheet 500, not only improving the winding yield and efficiency of the electrode sheet 500, but also greatly improving the safety of the lithium battery during later charge and discharge cycles.

[0060] 2. Since the humidifying box 220 is provided with a steam inlet 221 and a humidifying chamber 222 that are connected and communicate with each other, the output end of the atomizing assembly 210 is connected and communicates with the humidifying chamber 222 through the steam inlet 221. The humidifying box 220 is also provided with a pole piece inlet 223 and a pole piece outlet 224. Both the pole piece inlet 223 and the pole piece outlet 224 communicate with the humidifying chamber 222. The pole piece conveying channel 110 sequentially passes through the pole piece inlet 223, the humidifying chamber 222, and the pole piece outlet 224. The rolling and leveling mechanism 300 is used to perform rolling and leveling operations on the pole piece 500, so that the output end of the atomizing assembly 210 can input the atomized softening agent into the humidifying chamber 222 through the steam inlet 221, making the entire humidifying chamber 222 filled with the atomized softening agent. When the pole piece 500 is conveyed to the humidifying chamber 222 through the pole piece conveying channel 110, the atomizing assembly 210 can uniformly humidify the pole piece 500, greatly improving the humidity uniformity of the pole piece 500. At the same time, after the pole piece 500 is humidified, the adhesion between the powder on the pole piece 500 and the surface of the pole piece 500 is improved, enabling the humidifying and leveling device 10 to effectively solve the problem that the pole piece 500 is prone to powder shedding. When the pole piece 500 is humidified to the optimal humidity, the adhesion between the powder on the pole piece 500 and the surface of the pole piece 500 is greater than the adhesion with the rolling surface of the rolling and leveling mechanism 300, enabling the humidifying and leveling device 10 to effectively solve the problem that the powder is prone to sticking to the roller during the rolling and leveling process of the pole piece 500.

[0061] The above-described embodiments merely represent several implementation manners of the present disclosure. The description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the disclosed patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present disclosure, several deformations and improvements can still be made, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure patent shall be subject to the appended claims.

Claims

1. A humidifying and leveling device, comprising: a frame, in which a pole piece conveying channel is provided; characterized in that the humidifying and leveling device further comprises an atomizing and humidifying mechanism, a rolling and leveling mechanism and a baking mechanism which are sequentially arranged on the frame along the pole piece conveying channel; the atomizing and humidifying mechanism is used for performing atomizing and humidifying operations on the pole piece. The atomizing and humidifying mechanism comprises an atomizing component and a humidifying box. The humidifying box is provided with a steam inlet and a humidifying cavity which are communicated with each other. The output end of the atomizing component is communicated with the humidifying cavity through the steam inlet. The humidifying box is further provided with a pole piece inlet and a pole piece outlet, both of which are communicated with the humidifying cavity. The pole piece conveying channel sequentially passes through the pole piece inlet, the humidifying cavity and the pole piece outlet; the rolling and leveling mechanism is used for performing rolling and leveling operations on the pole piece; and the baking mechanism is used for performing baking operations on the pole piece.

2. The humidifying and leveling device according to claim 1, wherein The atomizing component comprises a humidifier and a transmission pipeline. The humidifier is installed and fixed on the frame. The atomizing output port of the humidifier is communicated with the steam inlet through the transmission pipeline. The humidifier is used for generating atomized gas.

3. The humidifying and leveling device according to claim 2, wherein The humidifying box comprises a box body and an upper cover. The box body is installed and fixed on the frame. The box body is provided with a humidifying groove. One end of the upper cover is rotatably connected to the box body, and the upper cover covers the notch of the humidifying groove to jointly form the humidifying cavity; both the pole piece inlet and the pole piece outlet are provided on the box body; the box body is provided with an installation port communicated with the humidifying groove, and one end of the transmission pipeline is located in the steam inlet and is hermetically connected to the box body.

4. The humidifying and leveling device according to claim 2, characterized in that, The transmission pipeline comprises a main pipeline and two branch pipelines. The main pipeline is communicated with the atomizing output port of the humidifier; one end of each branch pipeline is communicated with the main pipeline, and the other end is communicated with the steam inlet.

5. The humidifying and leveling device according to claim 1, wherein, The steam outlet direction of the output end of the atomizing component communicated with the end of the steam inlet is perpendicular to the transmission direction of the pole piece passing through the humidifying cavity; and / or, the humidifying box further comprises a humidifying filter screen, which is installed and fixed in the humidifying cavity and is correspondingly arranged with the steam inlet.

6. The humidifying and leveling device according to claim 1, characterized in that, The rolling and leveling mechanism comprises a first pair of rollers and a second pair of rollers, which are oppositely arranged on both sides of the pole piece conveying channel; and / or, the pole piece conveying speed through the rolling and leveling mechanism is equal to the pole piece conveying speed through the atomizing and humidifying mechanism; and / or, the pole piece conveying speed through the atomizing and humidifying mechanism is 30 m / min to 50 m / min; and / or, the pole piece conveying speed through the rolling and leveling mechanism is equal to the pole piece conveying speed through the baking mechanism.

7. The humidifying and leveling device according to claim 1, wherein, The baking mechanism comprises an oven through-frame, a passing roller group and far-infrared heating plates. The oven through-frame is arranged on the frame. The passing roller group is movably arranged in the oven through-frame to form a pole piece baking channel, which is communicated with the pole piece conveying channel. The far-infrared heating plates are arranged in the oven through-frame and are used for baking the pole piece passing through the pole piece baking channel.

8. The humidifying and leveling device according to claim 7, characterized in that, The roller group includes an upper roller group and a lower roller group. The upper roller group includes a plurality of upper rollers movably arranged side by side in the oven rack. The upper roller group includes a plurality of lower rollers movably arranged side by side in the oven rack. Each upper roller is staggered with the adjacent lower roller and connected by chain transmission.

9. The humidifying and leveling device according to claim 8, wherein The roller group also includes a driving member, a driving sprocket group and two transmission chains, the driving member is installed on the frame, the driving sprocket group is rotatably connected to the frame, the driving shaft of the driving member is connected to one end of the driving sprocket group, two driving sprockets are respectively provided at both ends of the driving sprocket group, upper driven sprockets are respectively provided at both ends of the upper roller, lower driven sprockets are respectively provided at both ends of the lower roller, and each of the transmission chains is respectively meshed with the corresponding driving sprocket, the corresponding upper driven sprocket and the corresponding lower driven sprocket in sequence.

10. A pole piece production device, characterized in that, The humidifying and leveling device comprises the humidifying and leveling device according to any one of claims 1 to 9.

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