A battery pole piece roll press roll

Abstract

The application discloses a battery pole piece rolling mill roller, and relates to the technical field of lithium battery pole piece rolling, which comprises a roller body, a center shaft assembly arranged in a center hole axially provided in the roller body, bearings connected with the center shaft assembly through shaft sleeve end covers at both ends of the roller body, and an electromagnetic induction coil arranged on the outer sleeve of the center shaft assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery pole piece rolling, in particular to a battery pole piece rolling mill roll. BACKGROUND

[0002] The lithium battery pole piece is the core material of the new energy automobile power battery, and the thickness consistency of the pole piece affects the overall performance and service safety of the battery, which puts forward very high requirements for the thickness control in the pole piece rolling process. At present, the pole piece rolling mill mainly adopts a large-diameter two-roller mill, and the thickness difference of the pole piece is controlled by improving the transverse stiffness of the mill and configuring a hydraulic bending roll and an initial roll shape. However, due to the large roll diameter, the maximum bending roll force is often hundreds of tons, and the bending roll force level is close to the rolling force, which greatly increases the equipment load and production energy consumption. Moreover, with the continuous expansion of the width specification of the pole piece, the fixed original roll shape cannot meet the production needs of pole pieces of different width specifications, and a new type of roll with online flexible roll shape control capability needs to be developed.

[0003] In the field of plate strip rolling, advanced roll shape control technologies such as VC roll, electromagnetic control roll, and CVC roll have been developed. However, due to the high requirement for environmental cleanliness in battery pole piece rolling, the VC roll technology using fluid as the expansion medium has a risk of leakage, which can easily contaminate the pole piece, so it is not suitable for use. The traditional segmented spray or air jet cooling roll shape control technology cannot be applied. The CVC technology uses a matched S-shaped roll shape curve, and the roll gap is controlled by transverse movement of the upper and lower rolls. The transverse contact and sliding friction between the roll and the surface of the pole piece can easily damage the coating. In addition, due to the large diameter of the pole piece rolling mill roll, the traditional electromagnetic control technology (hot expansion rod CN108372204) and the roll shape electronic temperature control technology (CN110479771) both have the problem of difficulty in constructing a steady-state temperature gradient and the problem of control time lag caused by thermal inertia. Online control still needs to break through the technical bottleneck. SUMMARY

[0004] The purpose of the present application is to provide a battery pole piece rolling mill roll to solve the problems existing in the prior art, so that heating and cooling can be independently controlled, and the roll body can have a larger temperature gradient and a faster roll shape control response speed.

[0005] To achieve the above purpose, the present application provides the following solutions:

[0006] The application provides a battery pole piece rolling mill roller, which can adopt electromagnetic induction heating and gas cooling coupling regulation and control of the roller shape, and the structure comprises a roller body, a center shaft assembly is arranged in a center hole axially provided in the roller body, bearings are connected to both ends of the roller body through shaft sleeve end covers, and both ends of the center shaft assembly are connected with the bearings; an electromagnetic induction coil is sleeved on the outside of the center shaft assembly, an external power supply is connected to the electromagnetic induction coil, a cooling gas pipe is fixedly arranged in the center shaft assembly, and cooling gas can be introduced into the cooling gas pipe; through synchronous coupling application of the roller body hole induction heating and gas cooling, the roller shape curve is realized online real-time regulation and control by using the thermal expansion and cold shrinkage effect of the roller body and the axial segmented temperature control.

[0007] Optionally, the center shaft assembly comprises flange pipes, two adjacent flange pipes are fixedly connected through a flange plate, and the outer ends of the two flange pipes at both ends are connected with the bearings, so that the center shaft assembly remains in a "stator" state and is not affected by the rotating motion of the roller, the induction power supply can be directly introduced, the service life and maintenance problems caused by the use of a slip ring are avoided, the cooling gas pipe can also be directly introduced, each component can be installed in advance and then placed in the center hole of the roller body, the installation is more convenient, and the structure is more compact; the electromagnetic induction coil is sleeved on the outside of the flange pipe, and the cooling gas pipe is fixedly arranged in the flange pipe.

[0008] Optionally, a wire pipe is fixedly arranged in the flange pipe, and a plurality of cooling gas pipes are arranged in the outer ring of the wire pipe; two wire ports are formed in the side wall of the flange pipe, and the wires of the electromagnetic induction coil enter the inside of the flange pipe through the wire ports and are connected with the external power supply after passing through the wire pipe.

[0009] Optionally, six bolt holes are circumferentially arranged on the outermost end face of the flange plate, the adjacent two bolt holes are spaced apart by 60°, and a bolt for fixedly connecting with the flange pipe is arranged in the bolt hole; a middle circular hole is arranged on the inner side end face of the flange plate, a plurality of circumferential circular holes are arranged in the outer ring of the middle circular hole, the middle circular hole is used for positioning and supporting the wire pipe, and the circumferential circular hole is used for positioning and supporting the cooling gas pipe.

[0010] Optionally, two gas channels are formed in the outer wall of the flange pipe, and the gas channels are used for communicating with both ends of the cooling gas pipe; the two gas channels are respectively communicated with an external cooling gas working cabinet through an air inlet pipe and an air outlet pipe.

[0011] Optionally, the roller body is made of forged steel or cast steel material.

[0012] Optionally, a threaded hole is arranged at one end of the shaft sleeve end cover, and the shaft sleeve end cover is connected with the roller body through the threaded hole.

[0013] Optionally, the bearing is a deep groove ball bearing.

[0014] The present application has the following technical effects relative to the prior art:

[0015] The present application couples electromagnetic induction heating technology with gas cooling, enabling independent control of heating and cooling, greater temperature gradient of the roller body, and faster roller profile regulation response speed. The present application does not produce lateral contact friction damage to the coated pole piece, unlike CVC roller lateral shifting to adjust the roll gap, and is beneficial to the protection of the battery pole piece rolling quality.

[0016] The central shaft assembly of the present application remains in a "stator" state unaffected by the rotation of the roller, and the induction power source can be directly introduced, avoiding the service life and maintenance problems caused by the use of slip rings, and the cooling gas conduit can also be directly introduced. The various components can be installed in advance and then placed in the central hole of the roller body, making installation more convenient and the structure more compact.

[0017] The present application uses segmented induction coils to adjust different roller profile curves, avoiding dependence on the original roller profile of the roller, improving the regulation ability of the rolling mill to the lateral thickness difference of the pole piece and the adaptability to different pole piece width specifications, and improving the thickness consistency of the pole piece. Each electromagnetic induction heating coil of the present application is powered separately, and each gas cooling device is also controlled separately, improving the flexibility of roller profile regulation. The present application regulates the roller profile through electromagnetic induction heating technology, which can reduce the configuration of hydraulic bending roller cylinders, reduce the rolling force and motor energy consumption of the roller, and realize the intelligentization and greenization of the pole piece rolling production. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0019] Figure 1 is a schematic view of the overall structure of the present application;

[0020] Figure 2 is a schematic view of the overall structure of the present application; Figure 1

[0021] Figure 3 is an isometric view of the flange pipe of the present application;

[0022] Figure 4 is a schematic view of the main view of the flange pipe of the present application;

[0023] Figure 5 is a front view of the flange plate of the present application;

[0024] ​Figure 6 A side view schematic diagram of the flange plate of the present application;

[0025] Figure 7 A schematic diagram of the position distribution of the cooling gas guide pipe and the wire guide pipe of the present application;

[0026] Figure 8 A radial displacement contour map and a roll profile curve map when the regulation of the embodiment of the present application reaches stability;

[0027] Figure 9 A temperature contour map and a roll surface temperature curve map when the regulation of the embodiment of the present application reaches stability.

[0028] In the figure: 1-roll body; 2-center shaft assembly; 3-electromagnetic induction coil; 4-cooling gas guide pipe, 4-1-first cooling gas guide pipe; 4-2-second cooling gas guide pipe; 4-3-third cooling gas guide pipe; 4-4-fourth cooling gas guide pipe; 4-5-fifth cooling gas guide pipe; 4-6-sixth cooling gas guide pipe; 5-wire guide pipe; 6-bearing; 7-bushing end cover; 8-flange pipe; 9-flange plate; 10-wire port. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0030] The purpose of the present application is to provide a battery pole piece rolling mill roll, to solve the problems existing in the prior art, so that heating and cooling can be independently controlled, and the roll body can have a greater temperature gradient and a faster roll profile regulation response speed.

[0031] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0032] The present application provides a battery pole piece rolling mill roll, which can adopt electromagnetic induction heating and gas cooling coupled regulation of roll profile, and the structure is as follows Figure 1As shown, including the roller body 1, the roller body 1 is opened in the center hole in the axial direction, the center shaft assembly 2 is installed in the center hole after being assembled, the center shaft assembly 2 is located in the center hole of the roller body 1, including the flange pipe 8, the flange plate 9, the cooling gas pipe 4 and the wire pipe 5, the roller body 1 is connected with the bearing 6 through the shaft sleeve end cover 7 at both ends, the center shaft assembly 2 is connected with the bearing 6 at both ends; The center shaft assembly 2 is provided with an electromagnetic induction coil 3, the electromagnetic induction coil 3 is connected with a power supply, the center shaft assembly 2 is fixedly provided with a cooling gas pipe 4 in the inside, and the cooling gas pipe 4 can be connected with cooling gas; Through the synchronous coupling application of the induction heating and gas cooling in the roller body 1, the thermal expansion and contraction effect of the roller body 1 and the axial segmented temperature control are utilized to realize the online real-time regulation and control of the roll shape curve.

[0033] In a specific embodiment, as shown in the accompanying drawings Figure 2 As shown, the center shaft assembly 2 is connected by the flange pipe 8, the electromagnetic induction coil 3 is arranged outside the middle three sections of the flange pipe 8, and is used for heating the inner wall of the roller body 1; The middle three sections of the flange pipe 8 are installed staggered by 60°, so that the cooling gas pipe 4 and the wire of the induction coil 3 are installed; The center shaft assembly 2 is positioned and supported by the bearing 6 and the center hole of the roller body 1, the bearing 6 is connected with the roller body 1 by the shaft sleeve end cover 7, so that the center shaft assembly 2 remains in the "stator" state without being affected by the rolling motion of the roll, the induction power supply can be directly introduced, the service life and maintenance problems caused by the use of slip ring are avoided, and the cooling gas pipe 4 can also be directly introduced. Each component can be installed in advance and then put into the center hole of the roller body 1, so that the installation is more convenient and the structure is more compact. As shown in the accompanying drawings Figure 3 and the accompanying drawings Figure 4 As shown, two small holes are arranged at both ends of the flange pipe 8 as the cooling gas pipe 4 channel, the cooling gas enters from the left end pipe and exits from the right end pipe, and carries away heat, and two small holes are arranged as wire ports 10, the wire of the electromagnetic induction coil 3 enters the inside of the flange pipe 8 through the wire port 10 and is connected with the external induction power supply through the wire pipe 5.

[0034] The flange plate 9 is installed at the connection of each section of the flange pipe 8, as shown in the accompanying drawings Figure 5 and the accompanying drawings Figure 6 The outermost side is provided with six bolt holes, each bolt hole is spaced by 60°, and is consistent with the flange pipe 8, and the inner side of the flange plate 9 is provided with seven round holes, the six round holes in the circumferential direction are used for positioning and supporting the cooling gas pipe 4, and the middle one is used for positioning and supporting the wire pipe 5. When working, the power supply is connected, each section of the electromagnetic induction coil 3 is powered respectively, and each section of the gas cooling device is also controlled respectively. The cooling gas pipe 4 and the wire pipe 5 are as shown in the accompanying drawings Figure 7As shown, the lengths of the six cooling gas pipes 4 are different, arranged inside the central shaft assembly 2 and positioned and supported by the flange plate 9, two cooling gas pipes 4 are arranged for each electromagnetic induction coil 3, wherein the first cooling gas pipe 4-1 and the second cooling gas pipe 4-2 serve as the gas inlet pipe and the gas outlet pipe of the right end electromagnetic induction coil 3, the third cooling gas pipe 4-3 and the fourth cooling gas pipe 4-4 serve as the gas inlet pipe and the gas outlet pipe of the middle section electromagnetic induction coil 3, and the fifth cooling gas pipe 4-5 and the sixth cooling gas pipe 4-6 serve as the gas inlet pipe and the gas outlet pipe of the left end electromagnetic induction coil 3, and all the cooling gas pipes 4 are connected with the external cooling gas working cabinet; the wire tube 5 is installed at the center of the six cooling gas pipes 4 as the passage of the wire of the electromagnetic induction coil 3.

[0035] In a specific embodiment, the roll size is selected as 900mm*1500mm, and the roll center hole size is 180mm. The switches of the external induction power supply and the cooling gas working cabinet are turned on, the current density of the middle section electromagnetic induction coil 3 is set as 8A / mm 2 , and the current densities of the two side electromagnetic induction coils 3 are set as 0; then the temperature of the middle section cooling gas is set as 30℃, and the temperature of the two side cooling gases is set as 20℃; then the electromagnetic induction heating is continuously conducted for 300s, and then the periodic heating mode is adopted, that is, the electromagnetic induction heating is stopped for 100s, and then the electromagnetic induction heating is conducted for 5s; finally, the roll shape curve reaches stability under the coupling of the electromagnetic induction heating and the cooling gas, and the radial displacement contour graph and the roll shape curve graph when the stability is reached are shown in the accompanying drawings Figure 8 , and the roll surface temperature is also stabilized, and the temperature contour graph and the roll surface temperature curve graph are shown in the accompanying drawings Figure 9 .

[0036] In the description of the present application, it should be noted that the terms "center", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0037] The principles and implementation modes of the present application are described by using specific examples in the present application, and the above examples are only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation modes and application ranges will be changed. In summary, the content of the present application should not be understood as limiting the present application.​

Claims

1. A roll for a battery electrode roll press, characterized in that: The device includes a roller body, a central shaft assembly housed within a central hole axially formed in the roller body, bearings connected to both ends of the roller body via bushing end caps, and the central shaft assembly connected to both ends of the bearings; an electromagnetic induction coil is sleeved on the central shaft assembly, the electromagnetic induction coil being externally powered, and a cooling gas conduit fixedly installed inside the central shaft assembly, through which cooling gas can flow; the central shaft assembly includes flanges, adjacent flanges being fixedly connected by flange plates, and the outer ends of the two flanges at both ends being connected to the bearings; the electromagnetic induction coil is sleeved on the outside of the flanges, and the cooling gas conduit is fixedly installed inside the flanges; the three middle flange sections are staggered by 60° during installation to facilitate the installation of the cooling gas conduit and the electromagnetic induction coil wires; six bolt holes are circumferentially provided on the outermost end face of the flange plate, with adjacent bolt holes spaced 60° apart, and bolts for fixed connection to the flanges are inserted into the bolt holes.

2. The battery electrode roll press roll according to claim 1, characterized in that: A wire conduit is fixed inside the flange tube, and multiple cooling gas conduits are arranged around the outer ring of the wire conduit. Two wire ports are opened on the side wall of the flange tube. The wires of the electromagnetic induction coil enter the flange tube through the wire ports, pass through the wire conduit, and are connected to an external power source.

3. The battery electrode roll press roll according to claim 2, characterized in that: The flange has a central circular hole on its inner end face, and a plurality of circumferential circular holes are provided around the central circular hole. The central circular hole is used to position and support the conduit, and the circumferential circular holes are used to position and support the cooling gas conduit.

4. The battery electrode roll press roll according to claim 1, characterized in that: Two gas channels are provided on the outer wall of the flange pipe, which are used to connect to both ends of the cooling gas duct; and are respectively connected to the external cooling gas working cabinet through the inlet pipe and the outlet pipe.

5. The battery electrode roll press roll according to claim 1, characterized in that: The roller body is made of forged steel or cast steel.

6. The battery electrode roll press roll according to claim 1, characterized in that: One end of the bushing end cover is provided with a threaded hole, and the bushing end cover is connected to the roller body through the threaded hole.

7. The battery electrode roll press roll according to claim 1, characterized in that: The bearing is a deep groove ball bearing.

Images