Rolling device and rolling method

Abstract

The rolling device comprises a heat conduction roller and a temperature control mechanism, and the heat conduction roller is provided with an axial end face located at the end and a radial surface located on the circumferential side; the temperature control mechanism is arranged outside the heat conduction roller and located in the axial direction and / or the radial direction of the heat conduction roller, and the temperature control mechanism is used for heating or cooling the axial end face and / or the radial surface of the heat conduction roller. The temperature control mechanism can adjust the temperature of the local deformation area of the heat conduction roller in a targeted manner, so that the surface of the heat conduction roller generates temperature change, and the temperature change can enable the heat conduction roller to generate deformation resisting deflection and thermal expansion due to thermal expansion and cold contraction, so that the problem that the thickness of the local area of a pole piece is thinned due to excessive approaching of the heat conduction roller is solved; therefore, the thickness uniformity of the rolled pole piece is improved. The thickness uniformity of the rolled pole piece is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature control of heat-conducting rollers, and particularly to a rolling device and a rolling method. Background Art

[0002] During the rolling process of the electrode sheet, the electrode sheet passes through the gap between two heat-conducting rollers arranged up and down. The two heat-conducting rollers rotate synchronously to compact the substrate to a preset thickness. During the rolling process of the electrode sheet and the temperature adjustment process of the heat-conducting rollers, there are axial deflection deformations and radial bulging deformations of the two heat-conducting rollers. Such deformations directly affect the uniformity of the rolling thickness of the electrode sheet. In the related art, only the two rolling rollers can move towards or away from each other to adjust the gap between them. This method cannot change the gap between the local parts of the two heat-conducting rollers and still cannot eliminate or compensate for the influence of the deformation of the heat-conducting rollers on the rolling thickness of the electrode sheet. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. For this purpose, the present invention provides a rolling device, which can reduce the influence of the deformation of the heat-conducting roller on the rolling thickness of the electrode sheet and improve the uniformity of the rolling thickness of the substrate.

[0004] The present invention also provides a rolling method.

[0005] The rolling device according to the first aspect embodiment of the present invention includes: A heat-conducting roller having an axial end face at the end and a radial surface on the circumferential side; A temperature control mechanism is arranged outside the heat-conducting roller and is located in the axial direction and / or the radial direction of the heat-conducting roller. The temperature control mechanism is used to heat or cool the axial end face and / or the radial surface of the heat-conducting roller.

[0006] The rolling device according to the embodiment of the present invention has at least the following beneficial effects: The temperature control mechanism in the present invention can specifically adjust the temperature of the local deformation area of the heat-conducting roller, causing a temperature change on the surface of the heat-conducting roller. This temperature change can cause the heat-conducting roller to generate deformations against deflection and thermal expansion due to thermal expansion and contraction, so as to improve the situation that the thickness of the local area of the electrode sheet becomes thinner due to excessive closeness and the thickness of the local area of the electrode sheet becomes thicker due to excessive distance, and improve the uniformity of the thickness of the electrode sheet after rolling.

[0007] According to some embodiments of the present invention, the temperature control mechanism is located in the axial direction of the heat-conducting roller. Along the axial direction of the heat-conducting roller, there is a gap between the axial end face and the temperature control mechanism; And / or, the temperature control mechanism is located in the radial direction of the heat-conducting roller. Along the radial direction of the heat-conducting roller, there is a gap between the radial surface and the temperature control mechanism.

[0008] According to some embodiments of the present invention, at least a part of the temperature control mechanism is located in the radial direction of the heat conduction roller, the radial surface includes a plurality of temperature control zones arranged along the axial direction of the heat conduction roller, the temperature control mechanism includes a plurality of temperature adjustment members, and each temperature adjustment member corresponds to a corresponding temperature control zone along the radial direction of the heat conduction roller.

[0009] According to some embodiments of the present invention, the temperature control mechanism includes a temperature adjustment member and a driving module, the temperature adjustment member is used to heat or cool the heat conduction roller, the driving module is connected to the temperature adjustment member, and drives the temperature adjustment member to move along the radial direction and / or the axial direction of the heat conduction roller.

[0010] According to some embodiments of the present invention, the rolling device includes a plurality of the temperature control mechanisms, the temperature control mechanisms are located in the axial direction of the heat conduction roller and are arranged at intervals along the circumferential direction of the heat conduction roller, at least one of the temperature control mechanisms is used to heat the axial end face, and at least one of the temperature control mechanisms is used to cool the axial end face; and / or, the rolling device includes a plurality of the temperature control mechanisms, the plurality of temperature control mechanisms are located in the radial direction of the heat conduction roller and are arranged at intervals along the circumferential direction of the heat conduction roller, at least one of the temperature control mechanisms is used to heat the radial surface, and at least one of the temperature control mechanisms is used to cool the radial surface.

[0011] According to some embodiments of the present invention, a central oil passage for introducing heat conduction oil, a plurality of transfer oil passages and a plurality of heat conduction oil passages are provided inside the heat conduction roller, the central oil passage is arranged at the center of the heat conduction roller for receiving and discharging heat conduction oil, the plurality of heat conduction oil passages are arranged at intervals along the circumferential direction of the heat conduction roller, and both ends of the transfer oil passage are respectively communicated with the central oil passage and the heat conduction oil passage.

[0012] According to some embodiments of the present invention, the temperature control mechanism is located in the axial direction of the heat conduction roller, and the temperature control mechanism faces the axial end face along the axial direction of the heat conduction roller; and / or, the temperature control mechanism is located in the radial direction of the heat conduction roller, and the temperature control mechanism faces the radial surface of the heat conduction roller along the radial direction of the heat conduction roller.

[0013] According to some embodiments of the present invention, the rolling device includes a control module and a detection module, the detection module can detect the thickness of the pole piece after rolling, the detection module and the temperature control mechanism are both communicatively connected to the control module, and the control module is configured to: according to the detection information of the detection module, control the temperature control mechanism to work, so that the temperature control mechanism heats or cools the axial end face and / or the radial surface of the heat conduction roller.

[0014] According to some embodiments of the present invention, the detection information includes at least one of the thickness of the pole piece at different positions in the width direction or the length direction, the bending amount of the pole piece, and the temperature at different positions of the heat-conducting roller; And / or, the control module is further configured to: control at least one of the cooling capacity of the temperature control mechanism, the heating capacity of the temperature control mechanism, the position of the temperature control mechanism along the axial direction of the heat-conducting roller, the temperature control area of the temperature control mechanism, the distance between the temperature control mechanism and the axial end face, and the distance between the temperature control mechanism and the radial surface according to the detection information of the detection module.

[0015] According to the rolling method of the second aspect embodiment of the present invention, a pole piece is rolled by using two heat-conducting rollers arranged oppositely up and down, and the thickness of the pole piece after rolling is detected; According to the difference in the thickness of different regions of the pole piece, the temperature control mechanism is controlled to heat or cool the axial end face and / or the radial surface of the heat-conducting roller.

[0016] The rolling method according to the embodiment of the present invention has at least the following beneficial effects: In the present invention, the temperature control mechanism can adjust the temperature of the local deformation area of the heat-conducting roller according to the thickness difference of the pole piece, so as to cause a temperature change on the surface of the heat-conducting roller, so as to improve the situation that the thickness of the local area of the pole piece becomes thinner due to being too close and the thickness of the local area of the pole piece becomes thicker due to being too far away, and improve the uniformity of the thickness of the pole piece after rolling.

[0017] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0018] The following further describes the present invention in conjunction with the drawings and embodiments, wherein: Figure 1 is a top view of an embodiment of the rolling device of the present invention; Figure 2 is a side view of an embodiment of the rolling device of the present invention; Figure 3 is a front view of an embodiment of the rolling device of the present invention; Figure 4 is a schematic diagram of an embodiment of the heat-conducting roller; Figure 5 is a schematic diagram of the heat-conducting roller rolling the pole piece in an embodiment; Figure 6 is a schematic diagram of the heat-conducting roller rolling the pole piece in another embodiment; Figure 7 is a schematic diagram of the heat-conducting roller rolling the pole piece in another embodiment; Figure 8 Schematic diagram of the cooperation of each module in the rolling device; Figure 9 Schematic diagram of an embodiment of the temperature control mechanism; Figure 10 Schematic diagram of the internal oil circuit of an embodiment of the heat conduction roller.

[0019] Reference numerals: Heat conduction roller 100, axial end face 110, radial surface 120, temperature control area 121, central oil circuit 130, transfer oil circuit 140, heat conduction oil circuit 150; temperature control mechanism 200, eddy current heating head 210, semiconductor 220, fan 230, temperature regulating member 240, drive module 250; control module 300; detection module 400. Detailed implementation manners

[0020] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0021] In the description of the present invention, it should be understood that with respect to the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0022] In the description of the present invention, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, exceeding, etc. are understood as not including the present number, and above, below, within, etc. are understood as including the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0023] In the description of the present invention, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0024] In the description of the present invention, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0025] In an embodiment of the present invention, a rolling device is provided. The rolling device can be used for rolling after the pole piece coating and drying, so as to improve the density and thickness consistency of the surface material of the pole piece, as well as the peeling strength between the surface active substance and the current collector foil, to prevent the active substance from peeling off during the electrolyte immersion and the later use of the battery.

[0026] Referring to Figures 1 to 3 , the rolling device includes a heat-conducting roller 100. The heat-conducting roller 100 is in a cylindrical shape. The end portions in the axial direction of the heat-conducting roller 100 are connected to a driving mechanism and can be driven to rotate around its own axis during the rolling of the pole piece. It can be understood that a unwinding device is provided upstream of the rolling device, and a winding device is provided downstream of the rolling device. The rolling device includes two heat-conducting rollers 100 arranged oppositely up and down. The pole piece to be rolled is unwound from the unwinding device and passes between the two heat-conducting rollers 100. The two heat-conducting rollers 100 are driven to rotate synchronously and apply a rolling pressure to the pole piece. The pole piece after rolling is collected by the winding device to complete winding.

[0027] During the rolling process of the pole piece at normal temperature, the rebound rate of the pole piece is large. The surface of the heat-conducting roller 100 in the present invention has a high temperature, providing a preset rolling temperature for the pole piece rolling, such as 80°C - 200°C. When the pole piece is rolled, it contacts the high-temperature heat-conducting roller 100, which can reduce the moisture of the active substances on the surface of the pole piece, reduce the rebound rate of the pole piece after rolling, and eliminate the residual internal stress in the pole piece after rolling, as well as enhance the adhesion between the active substance and the current collector, and increase the liquid absorption amount of the active substance during the electrolyte immersion process.

[0028] It can be understood that both ends of the heat-conducting roller 100 are supported and have a degree of freedom of rotation. Due to its own weight, the heat-conducting roller 100 is prone to deflection deformation, and due to its high temperature, the heat-conducting roller 100 is prone to expansion deformation. The above deformations of the heat-conducting roller 100 directly affect the rolling thickness of the pole piece, resulting in uneven thickness of the pole piece. The traditional rolling device cannot adjust the area where the heat-conducting roller 100 has local deformation, and cannot make the thickness of the pole piece tend to be consistent.

[0029] Based on the above, the roll pressing device in the embodiments of the present invention is configured with a temperature control mechanism 200. The temperature control mechanism 200 can release heat or cold, and can specifically regulate the temperature of the locally deformed area of the heat conducting roller 100, so that the surface of the heat conducting roller 100 is heated or cooled, thereby reducing the deformation amplitude of the heat conducting roller 100, and further reducing the influence of the deformation of the heat conducting roller 100 on the rolling thickness of the electrode sheet, and improving the uniformity of the electrode sheet thickness.

[0030] Specifically, referring to Figure 4 , the heat conducting roller 100 has an axial end face 110 at the end and a radial surface 120 on the circumferential side. When the electrode sheet is roll pressed, it contacts the radial surface 120 of the heat conducting roller 100. Both the axial end face 110 and the radial surface 120 belong to the surfaces of the heat conducting roller 100 exposed to the outside. The temperature control mechanism 200 is arranged outside the heat conducting roller 100 and is arranged in the radial and / or axial direction of the heat conducting roller 100. For the case where the temperature control mechanism 200 is arranged in the axial direction of the heat conducting roller 100, the temperature control mechanism 200 and the heat conducting roller 100 are arranged along the axial direction, and the temperature control mechanism 200 adjusts the temperature of the axial end face 110 of the heat conducting roller 100 to heat or cool the axial end face 110. For the case where the temperature control mechanism 200 is arranged in the radial direction of the heat conducting roller 100, the temperature control mechanism 200 is located on the side of the heat conducting roller 100 in the radial direction, and the temperature control mechanism 200 adjusts the temperature of the radial surface 120 of the heat conducting roller 100 to heat or cool the radial surface 120.

[0031] To Figure 5For example, take the upper heat-conducting roller 100 as the first heat-conducting roller 100a and the lower heat-conducting roller 100 as the second heat-conducting roller 100b. Due to their own weights, both the first heat-conducting roller 100a and the second heat-conducting roller 100b have deflection deformations that bend downward, and expansion deformations that expand toward the circumferential side due to high temperatures. If the pole piece is thin in the middle and thick at both sides along the axial direction of the heat-conducting roller 100, it indicates that the central regions between the two heat-conducting rollers 100 are too close to each other along the axial direction of the heat-conducting roller 100, and the end regions between the two heat-conducting rollers 100 are too far apart. For the first heat-conducting roller 100a, the expansion deformation of the central region toward the circumferential side should be reduced, or the expansion of the end region toward the circumferential side should be increased. For the second heat-conducting roller 100b, the expansion deformation of the central region toward the circumferential side should be reduced, or the expansion of the end region toward the circumferential side should be increased. Taking the temperature adjustment of the first heat-conducting roller 100a as an example, the temperature control mechanism 200 can be used to cool the central region of the radial surface 120 of the first heat-conducting roller 100a. The radial surface 120 of the first heat-conducting roller 100a has a shrinking tendency when cooled, thereby reducing the expansion deformation of the central region of the radial surface 120 of the first heat-conducting roller 100a toward the circumferential side, making the central regions between the two heat-conducting rollers 100 move appropriately away from each other to compensate for the thickness of the thinner middle region of the pole piece and making the thickness of the pole piece tend to be uniform. Or, the temperature control mechanism 200 can also be used to heat the central region of the axial end face 110 of the first heat-conducting roller 100a. The axial end face 110 of the first heat-conducting roller 100a has an expanding tendency when heated, thereby increasing the expansion amplitude of the end region of the first heat-conducting roller 100a toward the circumferential side, making the end regions between the two heat-conducting rollers 100 move appropriately closer to each other to reduce the thickness of the thicker regions at both ends of the pole piece and making the thickness of the pole piece tend to be uniform.

[0032] Therefore, according to the thickness situation of the pole piece after rolling, the deformation situation of the heat-conducting roller 100 can be obtained, and then the temperature control mechanism 200 can be used to specifically adjust the temperature of the local deformation region of the heat-conducting roller 100, causing a temperature change on the surface of the heat-conducting roller 100. This temperature change can cause the heat-conducting roller 100 to generate deformations that resist deflection and thermal expansion due to thermal expansion and contraction, so as to improve the situation where the thickness of the local region of the pole piece becomes thinner due to excessive closeness and the thickness of the local region of the pole piece becomes thicker due to excessive distance, and improve the uniformity of the thickness of the pole piece after rolling.

[0033] Of course, the shape of the pole piece after rolling has the characteristic of being diverse, and the distribution of the thickness of the pole piece is not limited to Figure 5 the shown situation. Taking Figure 6Taking the illustrated embodiment as an example, if the electrode sheet is thick in the middle and thin at both sides along the axial direction of the heat conduction roller 100, it indicates that along the axial direction of the heat conduction roller 100, the central regions between the two heat conduction rollers 100 are overly far apart, and the end regions between the two heat conduction rollers 100 are overly close. For the first heat conduction roller 100a, the expansion deformation of the central region towards the circumferential side should be increased, or the expansion of the end region towards the circumferential side should be decreased. For the second heat conduction roller 100b, the expansion deformation of the central region towards the circumferential side should be increased, or the expansion of the end region towards the circumferential side should be decreased. Taking the temperature adjustment of the first heat conduction roller 100a as an example, the central region of the radial surface 120 of the first heat conduction roller 100a can be heated through the temperature control mechanism 200. The radial surface 120 of the first heat conduction roller 100a has an expansion tendency when heated, thereby increasing the expansion deformation of the central region of the radial surface 120 of the first heat conduction roller 100a towards the circumferential side, making the central regions between the two heat conduction rollers 100 appropriately close to reduce the thickness of the relatively thick middle region of the electrode sheet and making the thickness of the electrode sheet tend to be consistent. Or, the temperature control mechanism 200 can also be used to cool the central region of the axial end face 110 of the first heat conduction roller 100a. The axial end face 110 of the first heat conduction roller 100a has a contraction tendency when cooled, thereby reducing the expansion amplitude of the end region of the first heat conduction roller 100a towards the circumferential side, making the end regions between the two heat conduction rollers 100 appropriately far apart to compensate for the thickness of the relatively thin two end regions of the electrode sheet and making the thickness of the electrode sheet tend to be consistent.

[0034] There may also be a situation where the electrode sheet is thick on one side and thin on the other side along the axial direction of the heat conduction roller 100. Taking Figure 7 the illustrated embodiment as an example, if the left region of the electrode sheet is thick and the right region is thin, it indicates that along the axial direction of the heat conduction roller 100, the left regions between the two heat conduction rollers 100 are overly far apart, and the right regions between the two heat conduction rollers 100 are overly close. For the first heat conduction roller 100a, the expansion deformation of the left region towards the circumferential side should be increased, or the expansion of the right region towards the circumferential side should be decreased. For the second heat conduction roller 100b, the expansion deformation of the left region towards the circumferential side should be increased, or the expansion of the right region towards the circumferential side should be decreased. Taking the temperature adjustment of the first heat conduction roller 100a as an example, the left region of the radial surface 120 of the first heat conduction roller 100a can be heated through the temperature control mechanism 200, or the right region of the radial surface 120 of the first heat conduction roller 100a can be cooled through the temperature control mechanism 200. The left region of the radial surface 120 of the first heat conduction roller 100a has an expansion tendency when heated, and the right region has a contraction tendency when cooled, thereby increasing the expansion deformation of the left region of the radial surface 120 of the first heat conduction roller 100a towards the circumferential side, or reducing the expansion of the right region towards the circumferential side, making the left regions between the two heat conduction rollers 100 appropriately close, or making the right regions between the two heat conduction rollers 100 appropriately far apart, to reduce the thickness of the relatively thick left region of the electrode sheet, or to increase the thickness of the relatively thin right region of the electrode sheet and making the thickness of the electrode sheet tend to be consistent.

[0035] Understandably, since the electrode sheet is simultaneously subjected to the rolling actions of the first heat-conducting roller 100a and the second heat-conducting roller 100b, when the thickness of the electrode sheet is uneven, the temperature control mechanism 200 can be controlled to adjust the temperatures of the first heat-conducting roller 100a and the second heat-conducting roller 100b simultaneously, so as to improve the adjustment efficiency and the flatness of the electrode sheet after rolling. For Figure 5 example, if the electrode sheet is thin in the middle and thick at both sides along the axial direction of the heat-conducting roller 100, the temperature control mechanism 200 can be used to cool the central area of the radial surface 120 of the first heat-conducting roller 100a, or alternatively, the temperature control mechanism 200 can be used to heat the central area of the axial end face 110 of the first heat-conducting roller 100a. At the same time, the temperature control mechanism 200 can also be used to cool the central area of the radial surface 120 of the second heat-conducting roller 100b, or heat the central area of the axial end face 110 of the second heat-conducting roller 100b.

[0036] Referring to Figure 8 , in the rolling device of the present invention, a control module 300 and a detection module 400 are further included. The detection module 400 can detect the thickness of the electrode sheet after rolling. Both the detection module 400 and the temperature control mechanism 200 are communicatively connected to the control module 300. The communicative connection is not limited to being realized by means such as wires, infrared, Bluetooth, WiFi, etc. The control module 300 is configured to: according to the detection information of the detection module 400, control the operation of the temperature control mechanism 200, so that the temperature control mechanism 200 heats or cools the axial end face 110 and / or the radial surface 120 of the heat-conducting roller 100.

[0037] Specifically, the detection module 400 includes a thickness gauge, and the thickness gauge can detect the thickness of the electrode sheet. If the information detected by the detection module 400 is that the middle area of the electrode sheet is thin and the two sides are thick along the axial direction of the heat-conducting roller 100, the control module 300 analyzes according to the detection information of the detection module 400, and can obtain the factor that the central areas between the two heat-conducting rollers 100 are overly far away from each other, and the end areas between the two heat-conducting rollers 100 are overly close to each other. Then, the control module 300 sends a working instruction to the temperature control mechanism 200, so that the temperature control mechanism 200 adjusts the temperature of the surface of the heat-conducting roller 100. The specific temperature adjustment can refer to Figure 5 the temperature adjustment method in the illustrated embodiment.

[0038] It should be noted that the detection module 400 can obtain the thickness information of the electrode sheet in real time. The control module 300 controls the temperature control mechanism 200 to continuously adjust the temperature of the surface of the heat conduction roller 100 according to the real-time detection information, so as to dynamically repair the thickness of the electrode sheet and realize the closed-loop control of the thickness of the electrode sheet. It can be understood that the detection period of the detection module 400 and the period for the control module 300 to send control instructions to the temperature control mechanism 200 can be preset, such as set to 1s, 1.5s, 2s, etc., so that the detection module 400 continuously performs detection work at preset time intervals to update the current thickness information of the electrode sheet in real time. At the same time, the control module 300 sends corresponding control instructions to the temperature control mechanism 200 at preset time intervals according to the updated detection information, so that the temperature control mechanism 200 can change the temperature adjustment strategy for the surface of the heat conduction roller 100 in real time. Through the closed-loop control of the thickness of the electrode sheet, the uniformity of the thickness of the electrode sheet is further improved.

[0039] In addition, the detection information of the detection module 400 is not limited to at least one of the thicknesses of different positions of the electrode sheet along the width direction or the length direction, the bending amount of the electrode sheet, the deflection of the heat conduction roller 100, the expansion amount of the heat conduction roller 100, and the temperature of different positions of the heat conduction roller 100. The control module 300 comprehensively analyzes the factors causing the uneven thickness of the electrode sheet according to the feedback of the above various detection information, and based on this, sends corresponding control instructions to the temperature control mechanism 200, which can improve the accuracy of the temperature control mechanism 200 for adjusting the temperature of the surface of the heat conduction roller 100 and improve the adjustment efficiency of the thickness uniformity of the electrode sheet.

[0040] In the present invention, the width direction of the electrode sheet refers to the direction parallel to the axis of the heat conduction roller 100, and the length direction of the electrode sheet is the moving direction when the electrode sheet passes through the heat conduction roller 100. If the heat conduction roller 100 has expansion deformation, then along the axial direction of the heat conduction roller 100, there is a situation of excessive approach or separation between the two heat conduction rollers 100, resulting in uneven thickness of the electrode sheet in the width direction; if the heat conduction roller 100 has deflection deformation, and the heat conduction roller 100 rolls the electrode sheet during continuous rotation, it will cause uneven thickness of the electrode sheet in the length direction; the detection module 400 is provided to include a thickness gauge, and by detecting the thicknesses of different positions of the electrode sheet along the width direction and the length direction with the thickness gauge, the specific situations of the current expansion deformation and deflection deformation of the heat conduction roller 100 can be obtained, so that the control module 300 can specifically control the temperature control mechanism 200 to adjust the temperature of the surface of the heat conduction roller 100.

[0041] In addition, the detection module 400 can be provided to include a laser scanner. By scanning the surface of the electrode sheet, the laser scanner can detect the curvature of the electrode sheet. According to the curvature of the electrode sheet, the deformation regions of the electrode sheet along the length direction and the width direction can be obtained, which is used for the control module 300 to analyze the deformation situation of the heat conduction roller 100, so as to more accurately control the temperature control mechanism 200 to adjust the temperature of the surface of the heat conduction roller 100.

[0042] In addition, it is possible to set the detection module 400 to include a temperature measuring instrument, which can be an optical pyrometer, a radiation thermometer, a colorimetric thermometer, etc., so that the temperature measuring instrument detects the temperatures of different positions of the heat conducting roller 100 in a non-contact manner. The control module 300 can send corresponding control instructions to the temperature control mechanism 200 according to the current temperature of the deformed area of the heat conducting roller 100, so as to achieve precise temperature control of the heat conducting roller 100.

[0043] In some embodiments, the control module 300 is further configured to: according to the detection information of the detection module 400, control at least one of the cooling capacity of the temperature control mechanism 200, the heating capacity of the temperature control mechanism 200, the position of the temperature control mechanism 200 along the axial direction of the heat conducting roller 100, the temperature control area of the temperature control mechanism 200, the distance between the temperature control mechanism 200 and the axial end face 110, and the distance between the temperature control mechanism 200 and the radial surface 120.

[0044] Exemplarily, the control module 300 obtains the position of the area of the heat conducting roller 100 that needs to be temperature-adjusted according to the detection information of the detection module 400, and then controls the temperature control mechanism 200 to move along the axial direction of the heat conducting roller 100 to the corresponding position, and makes the temperature control mechanism 200 heat or cool the position of the heat conducting roller 100 that needs to be temperature-adjusted, so as to achieve precise temperature control of a local area on the surface of the heat conducting roller 100. When the detection module 400 detects that the thickness uniformity of the pole piece is poor and the corresponding area of the heat conducting roller 100 needs to be quickly temperature-adjusted, the control module 300 can control the temperature control mechanism 200 to increase the cooling capacity or heating capacity, so that the corresponding area on the surface of the heat conducting roller 100 is quickly heated or cooled, which can improve the efficiency of temperature adjustment of the heat conducting roller 100, and further quickly improve the thickness non-uniformity of the pole piece. When the detection module 400 detects that the thickness non-uniform area of the pole piece is relatively concentrated and a small area of the heat conducting roller 100 needs to be temperature-adjusted, the control module 300 can control the temperature control mechanism 200 to reduce the temperature control area (the temperature control area is the area of the surface where the temperature control mechanism 200 can generate heat or cool), so that the temperature control module only temperature-adjusts the corresponding small area of the heat conducting roller 100, and realizes precise temperature control of a small local area of the heat conducting roller 100; if the detection module 400 detects that the thickness non-uniform area of the substrate is relatively dispersed and a large area of the heat conducting roller 100 needs to be temperature-adjusted, the control module 300 can control the temperature control mechanism 200 to expand the temperature control area, so that the temperature control module can simultaneously temperature-adjust a large area of the surface of the heat conducting roller 100, and improve the efficiency of temperature adjustment of the heat conducting roller 100.

[0045] For the non-contact temperature adjustment method of the temperature control mechanism 200 for the heat-conducting roller 100, when the temperature control mechanism 200 is relatively close to the heat-conducting roller 100, the heat or cold generated by the temperature control mechanism 200 can be quickly transferred to the heat-conducting roller 100, and the heat adjustment intensity received by the heat-conducting roller 100 is high. On the contrary, when the temperature control mechanism 200 is relatively far from the heat-conducting roller 100, the heat adjustment intensity received by the heat-conducting roller 100 is low. Therefore, when the required temperature adjustment amplitudes in different regions of the heat-conducting roller 100 are different, the control module 300 can change the distance between the temperature control mechanism 200 and the axial end face 110, or the distance between the temperature control mechanism 200 and the radial surface 120, so as to adjust the temperature adjustment intensity of the temperature control mechanism 200 on the heat-conducting roller 100, make different regions of the heat-conducting roller 100 receive appropriate temperature adjustment intensity, and achieve precise temperature control of the heat-conducting roller 100.

[0046] It can be understood that the control module 300 can select to send different control quality instructions to the temperature control mechanism 200 according to the detection module 400 of the detection module 400. Exemplarily, when it is necessary to quickly adjust the temperature of the heat-conducting roller 100 and the temperature adjustment region of the heat-conducting roller 100 is small, the control module 300 simultaneously controls the temperature control mechanism 200 to move to the corresponding position of the heat-conducting roller 100, increases the cooling capacity or heating capacity of the temperature control mechanism 200, and reduces the distance between the temperature control mechanism 200 and the axial end face 110 or between the temperature control mechanism 200 and the radial surface 120, and reduces the temperature control area of the temperature control mechanism 200.

[0047] When the temperature control mechanism 200 adjusts the temperature of the heat-conducting roller 100 in a non-contact manner, there is a gap between the temperature control mechanism 200 and the heat-conducting roller 100. That is, for the temperature control mechanism 200 arranged axially on the heat-conducting roller 100, there is a gap between the temperature control mechanism 200 and the axial end face 110 of the heat-conducting roller 100. For the temperature control mechanism 200 arranged radially on the heat-conducting roller 100, there is a gap between the temperature control mechanism 200 and the radial surface 120 of the heat-conducting roller 100. Since the temperature control mechanism 200 does not contact the heat-conducting roller 100, on the one hand, it will not introduce impurities to the surface of the heat-conducting roller 100, thereby affecting the cleanliness of the surface after the pole piece is roll-pressed. On the other hand, since the heat-conducting roller 100 is in a continuous rotation state during the pole piece roll-pressing process and the temperature control mechanism 200 remains stationary, as the heat-conducting roller 100 rotates, the temperature control mechanism 200 can adjust the temperature of different positions in the circumferential direction of the heat-conducting roller 100, improve the temperature adjustment efficiency of the heat-conducting roller 100, and there will be no problem of wire entanglement for supplying power to the temperature control mechanism 200.

[0048] In some embodiments, such as Figure 2 and Figure 3, the temperature control mechanism 200 includes an eddy current heating head 210. Based on electromagnetic induction and eddy current effect, eddy currents generate heat within the heat conducting roller 100 to achieve heating of the heat conducting roller 100; alternatively, the temperature control mechanism 200 includes a semiconductor refrigerator that utilizes the thermoelectric effect of the semiconductor 220 to produce cooling capacity, and the air flow generated by the fan 230 blows the cooling capacity to the surface of the heat conducting roller 100 to achieve cooling of the surface of the heat conducting roller 100. As Figure 9 shown in the embodiment, the semiconductor 220 is located on the front side of the fan 230 and is in a hollowed-out form. During the forward flow of the air flow generated by the fan 230, it passes through the gaps between the semiconductors 220 and carries the cooling capacity generated by the semiconductor 220 to blow to the surface of the heat conducting roller 100.

[0049] It can be understood that the temperature adjustment surface of the temperature control mechanism 200 arranged along the axial direction of the heat conducting roller 100 faces the axial end face 110 of the heat conducting roller 100 along the axial direction of the heat conducting roller 100, and mainly adjusts the temperature of the axial end face 110, so that the cooling capacity and heat of the temperature control mechanism 200 can be concentrated on the axial end face 110 to make full use of the heat and cooling capacity of the temperature control mechanism 200. The temperature adjustment area projected by the temperature control mechanism 200 on the axial end face 110 is relatively concentrated, and can be accurately positioned to a local area of the heat conducting roller 100 for temperature adjustment to prevent affecting the surface temperature of the electrode sheet. Similarly, the temperature adjustment surface of the temperature control mechanism 200 arranged along the radial direction of the heat conducting roller 100 faces the radial surface 120 of the heat conducting roller 100 along the radial direction of the heat conducting roller 100, and mainly adjusts the temperature of the radial surface 120, so that the cooling capacity and heat of the temperature control mechanism 200 can be concentrated on the radial surface 120, thereby making full use of the heat and cooling capacity of the temperature control mechanism 200, and the temperature adjustment area projected by the temperature control mechanism 200 on the radial surface 120 is relatively concentrated, and can be accurately positioned to a local area of the heat conducting roller 100 for temperature adjustment to prevent affecting the surface temperature of the electrode sheet.

[0050] Since two heat conducting rollers 100 cooperate to roll the electrode sheet, for the temperature control mechanism 200 that controls the temperature of the upper first heat conducting roller 100a, the temperature control mechanism 200 can be arranged above the first heat conducting roller 100a, or arranged on the front side or the rear side of the first heat conducting roller 100a in the electrode sheet conveying direction; for the temperature control mechanism 200 that controls the temperature of the lower second heat conducting roller 100b, the temperature control mechanism 200 can be arranged below the first heat conducting roller 100a, or arranged on the front side or the rear side of the second heat conducting roller 100b in the electrode sheet conveying direction. The temperature control mechanism 200 avoids the electrode sheet conveying area, ensures the smooth progress of the electrode sheet rolling process, and can prevent the heat or cooling capacity of the temperature control mechanism 200 from directly affecting the surface temperature of the electrode sheet.

[0051] In addition, as Figures 1 to 3, the rolling device may include a plurality of temperature control mechanisms 200. The plurality of temperature control mechanisms 200 are located axially of the heat-conducting roller 100 and are arranged at intervals along the circumferential direction of the heat-conducting roller 100. At least one of the temperature control mechanisms 200 is used to heat the axial end face 110, and at least one of the temperature control mechanisms 200 is used to cool the axial end face 110. That is, different temperature control mechanisms 200 located at the ends of the heat-conducting roller 100 respectively have the function of heating or cooling the axial end face 110. When it is necessary to adjust the temperature of the axial end face 110, the control module 300 can control the corresponding temperature control mechanism 200 to heat or cool the axial end face 110 according to the actual temperature adjustment requirement. Similarly, the plurality of temperature control mechanisms 200 can also be arranged radially of the heat-conducting roller 100 and are arranged at intervals along the axial direction of the heat-conducting roller 100. At least one of the temperature control mechanisms 200 is used to heat the radial surface 120, and at least one of the temperature control mechanisms 200 is used to cool the radial surface 120; Therefore, different temperature control mechanisms 200 located radially of the heat-conducting roller 100 respectively have the function of heating or cooling the radial surface 120. When it is necessary to adjust the temperature of the radial surface 120, the control module 300 can control the corresponding temperature control mechanism 200 to cool or heat the radial surface 120 according to the actual temperature adjustment requirement.

[0052] As Figure 1 In the embodiment shown in Figure 2 taking the temperature control mechanism 200 for adjusting the temperature of the first heat-conducting roller 100a as an example, two of the temperature control mechanisms 200 are arranged radially of the first heat-conducting roller 100a. The two temperature control mechanisms 200 are respectively located above the first heat-conducting roller 100a and on one side of the first heat-conducting roller 100a along the pole piece conveying direction. One of the temperature control mechanisms 200 includes an eddy current heating head and is used to heat the radial surface 120, and the other temperature control mechanism 200 includes a semiconductor refrigerator and is used to cool the radial surface 120. Two temperature control mechanisms 200 are arranged at both axial ends of the first heat-conducting roller 100a. The two temperature control mechanisms 200 are fixed to the frame and are located on both sides of the first heat-conducting roller 100a along the pole piece conveying direction. One of the temperature control mechanisms 200 is used to heat the axial end face 110, and the other temperature control mechanism 200 is used to cool the axial end face 110.

[0053] In one embodiment, as Figure 3As shown, the temperature control mechanism 200 includes a temperature adjustment member 240 and a drive module 250. The temperature adjustment member 240 is used to heat or cool the heat conduction roller 100. The temperature adjustment member 240 can be set as an eddy current heating head for heating the surface of the heat conduction roller 100, or can be set as a semiconductor refrigerator for cooling the surface of the heat conduction roller 100. The drive module 250 is connected to the temperature adjustment member 240 and drives the temperature adjustment member 240 to move along the radial direction and / or the axial direction of the heat conduction roller 100 to change the distance between the temperature adjustment member 240 and the radial surface 120, the distance between the temperature adjustment member 240 and the axial end face 110, the position of the temperature adjustment member 240 located in the radial direction of the heat conduction roller 100 in the axial direction of the heat conduction roller 100, and the position of the temperature adjustment member 240 located in the axial direction of the heat conduction roller 100 in the radial direction of the heat conduction roller 100. The control module 300 is communicatively connected to the drive module 250. The control module 300 controls the drive module 250 to drive the temperature adjustment member 240 to move according to the detection information of the detection module 400, so as to realize precise temperature control of the heat conduction roller 100.

[0054] The drive module 250 is not limited to being set as a multi-degree-of-freedom manipulator, a multi-axis drive module, etc., so that the drive module 250 can drive the temperature adjustment member 240 to move in different directions to change the position of the temperature adjustment member 240 in different directions.

[0055] In addition, the temperature control mechanism 200 may include a plurality of temperature adjustment members 240. At least some of the temperature adjustment members 240 are arranged in the radial direction of the heat conduction roller 100 and are arranged along the axial direction of the heat conduction roller 100. As Figure 4 shown, the radial surface 120 includes a plurality of temperature control zones 121 arranged along the axial direction of the heat conduction roller 100. The temperature control mechanism 200 includes a plurality of temperature adjustment members 240. Each temperature adjustment member 240 corresponds to a corresponding temperature control zone 121 along the radial direction of the heat conduction roller 100, that is, the temperature adjustment member 240 and the temperature control zone 121 are in one-to-one correspondence. When it is necessary to adjust the temperature of a certain temperature control zone 121 on the radial surface 120, the control module 300 can control the corresponding temperature adjustment member 240 to separately adjust the temperature of this temperature control zone 121, so as to realize precise temperature control of the heat conduction roller 100.

[0056] It can be understood that by changing the number of simultaneously working temperature adjustment members 240, the temperature control area of the temperature control mechanism 200 can be adjusted; for the temperature adjustment requirements of different regions of the heat conduction roller 100, the temperature adjustment members 240 for adjusting the temperature of different temperature control zones 121 can be set to have different refrigerating capacities or heating capacities, and precise temperature control of the heat conduction roller 100 can be realized.

[0057] In an embodiment, as Figure 10As shown in the figure, an oil passage for introducing heat-conducting oil is provided inside the heat-conducting roller 100. The high-temperature heat-conducting oil enters the oil passage inside the heat-conducting roller 100 through a rotary joint, and then heats the heat-conducting roller 100, so that the heat-conducting roller 100 has a high temperature, and the electrode sheet is rolled under the high-temperature state. Specifically, the oil passage includes a central oil passage 130, a plurality of transfer oil passages 140 and a plurality of heat-conducting oil passages 150. The central oil passage 130 is arranged at the center of the heat-conducting roller 100, and is used for receiving the heat-conducting oil introduced from the outside and discharging the heat-conducting oil. The plurality of heat-conducting oil passages 150 are arranged at intervals along the circumferential direction of the heat-conducting roller 100 and extend along the axis of the heat-conducting roller 100. The two ends of the transfer oil passage 140 are respectively communicated with the central oil passage 130 and the heat-conducting oil passage 150. The heat-conducting oil entering the central oil passage 130 flows through the transfer oil passage 140 into different heat-conducting oil passages 150. During the process of flowing in the heat-conducting oil passage 150, the heat-conducting oil heats the heat-conducting roller 100, and then flows out from the other end of the heat-conducting oil passage 150, and returns to the central oil passage 130 through the transfer oil passage 140 and is discharged.

[0058] It can be understood that the heat-conducting roller 100 has a large thermal inertia when heated by heat-conducting oil. When changing the oil temperature and flow rate of the heat-conducting oil, it takes a certain time to make the roller surface temperature of the heat-conducting roller 100 reach relative stability. Therefore, the temperature regulation of the heat-conducting oil for the heat-conducting roller 100 has a large hysteresis; while the temperature control mechanism 200 in the present invention regulates the surface temperature of the heat-conducting roller 100, and can realize rapid temperature control of the heat-conducting roller 100. Due to the hysteresis of the temperature regulation of the heat-conducting oil inside the heat-conducting roller 100, the temperature regulation of the surface of the heat-conducting roller 100 by the temperature control mechanism 200 has little influence on the rolling of the electrode sheet.

[0059] The present invention also provides a rolling method, which uses two heat-conducting rollers 100 arranged oppositely up and down to roll the electrode sheet, and then detects the thickness of the rolled electrode sheet. If the thickness of the electrode sheet is uneven, according to the difference in the thickness of different regions of the electrode sheet, the temperature control mechanism 200 is controlled to heat or cool the axial end face 110 and / or the radial surface 120 of the heat-conducting roller 100, so as to realize the temperature regulation of the local area of the heat-conducting roller 100, and then the heat-conducting roller 100 generates deformation against deflection and thermal expansion due to thermal expansion and contraction, so as to improve the uneven thickness of the heat-conducting roller 100 and improve the uniformity of the thickness of the rolled electrode sheet.

[0060] Specifically, the detection module 400 can be used to detect the thickness and bending condition of the electrode sheet, as well as the deflection deformation, expansion deformation and temperature of the heat-conducting roller 100. The control module 300 controls the temperature control area of the temperature control mechanism 200, the position of the temperature control mechanism 200, the distance between the temperature control mechanism 200 and the heat-conducting roller 100, etc. according to the detection information of the detection module 400, so as to realize the precise temperature regulation of the heat-conducting roller 100 and improve the uniformity of the thickness of the electrode sheet.

[0061] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. Rolling device, characterized in that: include: A heat-conducting roller having an axial end surface at the end and a radial surface at the circumference; The temperature control mechanism is arranged outside the heat-conducting roller and is located in the axial direction and / or radial direction of the heat-conducting roller. The temperature control mechanism is used to heat or cool the axial end face and / or the radial surface of the heat-conducting roller.

2. The rolling device according to claim 1, characterized in that: The temperature control mechanism is located in the axial direction of the heat-conducting roller, and there is a gap between the axial end surface and the temperature control mechanism along the axial direction of the heat-conducting roller; And / or, the temperature control mechanism is located in the radial direction of the heat-conducting roller, and along the radial direction of the heat-conducting roller, there is a gap between the radial surface and the temperature control mechanism.

3. The rolling device according to claim 1, characterized in that: At least part of the temperature control mechanism is located in the radial direction of the heat-conducting roller, the radial surface includes a plurality of temperature control zones arranged along the axial direction of the heat-conducting roller, the temperature control mechanism includes a plurality of temperature regulating components, and each of the temperature regulating components corresponds to a corresponding temperature control zone along the radial direction of the heat-conducting roller.

4. The rolling device according to claim 1, characterized in that: The temperature control mechanism includes a temperature regulating element and a driving module. The temperature regulating element is used to heat or cool the heat-conducting roller. The driving module is connected to the temperature regulating element and drives the temperature regulating element to move radially and / or axially of the heat-conducting roller.

5. The rolling device according to claim 1, characterized in that: The rolling device comprises a plurality of temperature control mechanisms, which are located in the axial direction of the heat-conducting roller and arranged at intervals along the circumference of the heat-conducting roller, at least one of the temperature control mechanisms is used to heat the axial end surface, and at least one of the temperature control mechanisms is used to cool the axial end surface; And / or, the rolling device includes a plurality of the temperature control mechanisms, the plurality of the temperature control mechanisms are located in the radial direction of the heat-conducting roller and are arranged at intervals along the circumference of the heat-conducting roller, at least one of the temperature control mechanisms is used to heat the radial surface, and at least one of the temperature control mechanisms is used to cool the radial surface.

6. The rolling device according to claim 1, characterized in that: The interior of the heat-conducting roller is provided with a central oil passage for introducing heat-conducting oil, a plurality of transfer oil passages and a plurality of heat-conducting oil passages. The central oil passage is arranged at the center of the heat-conducting roller for receiving and discharging the heat-conducting oil. The plurality of heat-conducting oil passages are arranged at intervals along the circumference of the heat-conducting roller. The two ends of the transfer oil passage are respectively connected to the central oil passage and the heat-conducting oil passage.

7. The rolling device according to claim 1, characterized in that: The temperature control mechanism is located in the axial direction of the heat-conducting roller, and the temperature control mechanism is along the axial direction of the heat-conducting roller toward the axial end surface; And / or, the temperature control mechanism is located in the radial direction of the heat-conducting roller, and the temperature control mechanism faces the radial surface of the heat-conducting roller along the radial direction of the heat-conducting roller.

8. The rolling device according to any one of claims 1 to 7, characterized in that: The rolling device includes a control module and a detection module, the detection module can detect the thickness of the electrode after rolling, the detection module and the temperature control mechanism are both communicatively connected to the control module, and the control module is configured to: control the temperature control mechanism to operate according to the detection information of the detection module, so that the temperature control mechanism heats or cools the axial end face and / or the radial surface of the heat-conducting roller.

9. The rolling device according to claim 8, characterized in that: The detection information includes at least one of the thickness of the pole piece at different positions along the width direction or the length direction, the bending amount of the pole piece, and the temperature of different positions of the heat transfer roller; And / or, the control module is further configured to control at least one of the cooling capacity of the temperature control mechanism, the heating capacity of the temperature control mechanism, the axial position of the temperature control mechanism along the heat transfer roller, the temperature control area of ​​the temperature control mechanism, the distance between the temperature control mechanism and the axial end face, and the distance between the temperature control mechanism and the radial surface according to the detection information of the detection module.

10. Rolling method, characterized in that: Using two heat-conducting rollers facing each other up and down to roll the pole piece, and detecting the thickness of the pole piece after rolling; According to the difference in thickness of different regions of the pole piece, the temperature control mechanism is controlled to heat or cool the axial end surface and / or the radial surface of the heat-conducting roller.

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