Roller surface thermal deformation error compensation structure of lithium battery pole piece working roller

Abstract

The utility model discloses a roller surface thermal deformation error compensation structure of a lithium battery pole piece working roller. The roller surface thermal deformation error compensation structure comprises a central heating hole and N peripheral heating holes, wherein the central heating hole is formed in the lithium battery pole piece working roller; the N peripheral heating holes are formed in a cylindrical roller body of the lithium battery pole piece working roller; n left-end radial heating holes are obliquely formed in the left end of the cylindrical roller body in the radial direction, one ends of the N left-end radial heating holes communicate with the center heating hole, and the other ends of the N left-end radial heating holes correspondingly communicate with the N peripheral heating holes; n right-end radial heating holes are obliquely formed in the right end of the cylindrical roller body in the radial direction, one ends of the N right-end radial heating holes communicate with the center heating hole, and the other ends of the N right-end radial heating holes correspondingly communicate with the N peripheral heating holes; and hole opening parts at two ends of the peripheral heating hole are respectively provided with a section of reamed hole for compensating the thermal deformation error of the roller surface. According to the utility model, the shape precision of the roller surface of the lithium battery pole piece working roller in a hot working state is improved, and the uniformity of the rolling thickness of a foil plate is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of roller structure design, in particular to a roller surface thermal deformation error compensation structure of a lithium battery pole piece working roller. Background Art

[0002] The foil sheet for lithium battery pole pieces is formed by rolling with hot rollers as working rollers, and the working temperature of the hot rollers reaches above 120°C. The existing hot working roller structure includes a cylindrical roller body for rolling the foil sheet and shaft heads connected to both ends of the cylindrical roller body. The hot rollers are usually used in pairs and are rotatably arranged on the rolling mill through their shaft heads and bearing components connected to the shaft heads. In order to maintain the rolling temperature of the hot rollers, a central heating hole is opened along the axial direction at the central axis of the hot rollers, and hot oil is introduced into the central heating hole during operation.

[0003] However, the existing hot rollers still have the following problems when used:

[0004] The hot roller has a high working temperature but uneven heat dissipation during operation. Usually, more heat is lost at the two ends of the hot roller, which will cause a slight (several microns) thermal deformation uneven error in the outer circle of the cylindrical roller. The error characteristic is that the outer diameter of the middle part of the cylindrical roller is larger than the outer diameter of the two ends of the cylindrical roller, forming a drum error (the drum error of the cylindrical roller is relatively small in the middle part of the roller surface, so the drum error of the cylindrical roller can be regarded as an approximate trapezoidal error). The existence of hot roller drum error or approximate trapezoidal error will seriously affect the uniformity of the foil rolling thickness. Utility Model Content

[0005] In order to solve the above problems, the utility model proposes a roller surface thermal deformation error compensation structure for lithium battery pole piece working rollers, aiming to improve the roller surface shape accuracy of lithium battery pole piece working rollers in hot working state, thereby improving the uniformity of foil rolling thickness. The specific technical scheme is as follows:

[0006] A roller surface thermal deformation error compensation structure of a lithium battery pole piece working roller comprises a cylindrical roller body arranged in the middle part of the lithium battery pole piece working roller and shaft heads connected to the two ends of the cylindrical roller body, a central heating hole is axially arranged at the central axis part of the lithium battery pole piece working roller, and N peripheral heating holes are axially arranged at the part of the cylindrical roller body close to the edge of the outer circle of the cylindrical roller body; N left radial heating holes are obliquely arranged in the radial direction at the left end part of the cylindrical roller body, and one end of the N left radial heating holes is connected to the central heating hole, and the other end is correspondingly connected to the N peripheral heating holes; N right radial heating holes are obliquely arranged in the radial direction at the right end part of the cylindrical roller body, and one end of the N right radial heating holes is connected to the central heating hole, and the other end is correspondingly connected to the N peripheral heating holes; wherein, a section of expansion hole for compensating the roller surface thermal deformation error is respectively arranged at the two end opening parts of the peripheral heating hole, and the left radial heating hole is respectively connected to the central heating hole and the peripheral heating hole through the expansion holes at both ends.

[0007] As one of the preferred solutions of the hole expansion structure, the hole expansion is a cylindrical hole.

[0008] As a second preferred solution of the hole expansion structure, the hole expansion is a conical hole with a relatively large hole mouth diameter and a relatively small hole bottom diameter.

[0009] In the utility model, the plurality of peripheral heating holes are evenly arranged at intervals along the circumference of the cylindrical roller body.

[0010] Preferably, the left radial heating hole and the right radial heating hole are respectively inclined toward the inner direction of the cylindrical roller body, the left radial heating hole is inclined inwardly by 55 to 65 degrees relative to the left end surface of the cylindrical roller body, and the right radial heating hole is inclined inwardly by 55 to 65 degrees relative to the right end surface of the cylindrical roller body.

[0011] In the utility model, the shaft heads at both ends of the cylindrical roller body are respectively coaxially and integrally connected with the cylindrical roller body.

[0012] In the utility model, the left and right end surfaces of the cylindrical roller body are respectively provided with sealing cover plates for sealing the openings at both ends of the peripheral heating holes.

[0013] Preferably, the left and right end surfaces of the cylindrical roller body are respectively coated with a layer of heat insulation coating.

[0014] Preferably, a layer of heat-insulating coating is coated on the sealing cover plate.

[0015] In order to realize the circulation of hot oil, a further preferred scheme is: the central heating hole is an axial blind hole opened from the left end of the lithium battery pole piece working roller toward the inner direction of the cylindrical roller body, and a hot oil inlet pipe is inserted into the central heating hole, the right end opening of the hot oil inlet pipe is closed, a section of the outer circle of the right end of the hot oil inlet pipe is sealingly connected to the central heating hole, and N oil delivery distribution holes corresponding to the N right end radial heating holes are arranged on a section of the outer circle of the right end of the hot oil inlet pipe, and a gap is arranged between the left part of the hot oil inlet pipe and the central heating hole to form a hot oil reflux channel for hot oil to flow back from the N left end radial heating holes to the central heating hole.

[0016] Preferably, the specification parameters of the number and size of the peripheral heating holes are obtained by conducting a hot test on the lithium battery pole piece working roller at a specified working temperature.

[0017] During the test, a smaller number of peripheral heating holes and smaller-sized expansion holes can be processed on the lithium battery pole piece working roller, and the error compensation of the roller surface outer diameter of the lithium battery pole piece working roller can be measured. If the error compensation value does not reach the set compensation amount, the number of peripheral heating holes can be further increased or the size of the expansion hole can be increased until the roller surface outer diameter error of the lithium battery pole piece working roller reaches the specified requirements.

[0018] The lithium battery pole piece working roller in the utility model is also used as a working roller for rolling other foil plates except the foil plates for battery pole pieces.

[0019] During operation, high-temperature hot oil is dispersed from the inner hole of the hot oil inlet pipe through the oil distribution hole into the right-end radial heating holes, then enters the peripheral heating holes from the right-end radial heating holes, then enters the left-end radial heating holes from the peripheral heating holes, and finally flows back from the left-end radial heating holes to the hot oil reflux channel located between the central heating hole and the hot oil inlet pipe to be recovered, thereby forming a circulation flow of hot oil inside the cylindrical roller body.

[0020] The beneficial effects of the utility model are:

[0021] By arranging N peripheral heating holes axially at the edge of the outer circle of the cylindrical roller body near the outer circle of the cylindrical roller body, and arranging expansion holes at both ends of the peripheral heating holes, the heat transfer capacity of the hot oil at both ends of the outer circle of the cylindrical roller body can be enhanced, thereby effectively compensating for the heat loss at both ends of the outer circle of the cylindrical roller body, and finally making the temperature at both ends of the outer circle of the cylindrical roller body consistent with the temperature in the middle part, thereby avoiding the drum shape error caused by inconsistent thermal deformation of the outer circle of the cylindrical roller body. This improves the roller surface shape accuracy of the lithium battery pole piece working roller in the hot working state, thereby improving the uniformity of the foil rolling thickness. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The utility model is a schematic diagram of a roller surface thermal deformation error compensation structure of a lithium battery pole piece working roller.

[0023] In the figure: 1. Lithium battery pole piece working roller, 2. Cylindrical roller body, 3. Shaft head, 4. Center heating hole, 5. Peripheral heating hole, 6. Left end radial heating hole, 7. Right end radial heating hole, 8. Expanding hole, 9. Sealing cover plate, 10. Hot oil inlet pipe, 11. Oil distribution hole, 12. Gap, 13. High temperature resistant seal. DETAILED DESCRIPTION

[0024] The following is a further description of the specific implementation of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0025] like Figure 1 The figure shows an embodiment of a roller surface thermal deformation error compensation structure of a lithium battery pole piece working roller of the utility model, comprising a cylindrical roller body 2 arranged in the middle part of the lithium battery pole piece working roller 1 and an axial head 3 connected to both ends of the cylindrical roller body 2, a central heating hole 4 is axially arranged at the central axis of the lithium battery pole piece working roller 1, and N peripheral heating holes 5 are axially arranged at the edge of the outer circle of the cylindrical roller body 2 on the cylindrical roller body 2; N left-end radial heating holes 6 are obliquely arranged in the radial direction at the left end of the cylindrical roller body 2, and the N left-end radial heating holes 6 are obliquely arranged in the radial direction. One end of the hole 6 is connected to the central heating hole 4, and the other end is correspondingly connected to the N peripheral heating holes 5; N right-end radial heating holes 7 are arranged obliquely in the radial direction at the right end of the cylindrical roller body 2, and one end of the N right-end radial heating holes 7 is connected to the central heating hole 4, and the other end is correspondingly connected to the N peripheral heating holes 5; wherein, a section of expansion hole 8 for compensating for the thermal deformation error of the roller surface is respectively arranged at the orifice positions at both ends of the peripheral heating hole 5, and the left-end radial heating hole 6 is respectively connected to the central heating hole 4 and the peripheral heating hole 5 through the expansion holes 8 at both ends.

[0026] As one of the preferred solutions of the hole expansion structure, the hole expansion 8 is a cylindrical hole.

[0027] As the second preferred solution of the hole expansion structure, the hole expansion 8 is a conical hole with a relatively large hole opening diameter and a relatively small hole bottom diameter.

[0028] In this embodiment, the plurality of peripheral heating holes 5 are evenly spaced along the circumference of the cylindrical roller body 2 .

[0029] Preferably, the left radial heating hole 6 and the right radial heating hole 7 are respectively inclined toward the inner direction of the cylindrical roller body 2, the left radial heating hole 6 is inclined inwardly by 55 to 65 degrees relative to the left end surface of the cylindrical roller body 2, and the right radial heating hole 7 is inclined inwardly by 55 to 65 degrees relative to the right end surface of the cylindrical roller body 2.

[0030] In this embodiment, the shaft heads 3 at both ends of the cylindrical roller body 2 are coaxially and integrally connected to the cylindrical roller body 2 respectively.

[0031] In this embodiment, the left and right end surfaces of the cylindrical roller body 2 are respectively provided with sealing cover plates 9 for sealing the openings at both ends of the peripheral heating holes 5 .

[0032] Preferably, the left and right end surfaces of the cylindrical roller body 2 are respectively coated with a layer of heat insulation coating.

[0033] Preferably, a layer of heat-insulating coating is coated on the sealing cover plate 9.

[0034] In order to realize the circulation of hot oil, a further preferred scheme is: the central heating hole 4 is an axial blind hole opened from the left end of the lithium battery pole piece working roller 1 toward the inner direction of the cylindrical roller body 2, and a hot oil inlet pipe 10 is inserted into the central heating hole 4, the right end opening of the hot oil inlet pipe 10 is closed, a section of the outer circle of the right end of the hot oil inlet pipe 10 is sealed and connected to the central heating hole 4, and N oil delivery distribution holes 11 corresponding to the N right end radial heating holes 7 are arranged on a section of the outer circle of the right end of the hot oil inlet pipe 10, and a gap 12 is arranged between the left part of the hot oil inlet pipe 10 and the central heating hole 4, thereby forming a hot oil reflux channel for hot oil to flow back from the N left end radial heating holes 6 to the central heating hole 4.

[0035] Preferably, the specification parameters of the number and size of the expansion holes 8 of the peripheral heating holes 4 are obtained by performing a hot test on the lithium battery pole piece working roller 1 at a specified working temperature.

[0036] During the test, a smaller number of peripheral heating holes 5 and smaller-sized expansion holes 8 can be processed on the lithium battery pole piece working roller 1, and the error compensation of the roller surface outer diameter of the lithium battery pole piece working roller 1 can be measured. If the error compensation value does not reach the set compensation amount, the number of peripheral heating holes 5 can be further increased or the size of the expansion hole 8 can be increased until the roller surface outer diameter error of the lithium battery pole piece working roller 1 meets the specified requirements.

[0037] The lithium battery pole piece working roller 1 in this embodiment is also used as a working roller for rolling other foil plates except for the foil plates for battery pole pieces.

[0038] During operation, high-temperature hot oil is dispersed from the inner hole of the hot oil inlet pipe 10 through the oil distribution hole 11 into the right-end radial heating holes 7, then enters the peripheral heating hole 5 from the right-end radial heating hole 7, and then enters the left-end radial heating hole 6 from the peripheral heating hole 5, and finally flows back from the left-end radial heating hole 6 to the hot oil reflux channel 12 located between the central heating hole 4 and the hot oil inlet pipe 10 to be recovered, thereby forming a circulation flow of hot oil inside the cylindrical roller body 1.

[0039] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A roller surface thermal deformation error compensation structure for a lithium battery pole piece working roller, characterized in that: It comprises a cylindrical roller body arranged in the middle part of the lithium battery pole piece working roller and an axial head connected to the two ends of the cylindrical roller body, a central heating hole is axially arranged at the central axis part of the lithium battery pole piece working roller, and N peripheral heating holes are axially arranged at the part of the cylindrical roller body close to the edge of the outer circle of the cylindrical roller body; N left radial heating holes are obliquely arranged in the radial direction at the left end part of the cylindrical roller body, and one end of the N left radial heating holes is connected to the central heating hole, and the other end is correspondingly connected to the N peripheral heating holes; N right radial heating holes are obliquely arranged in the radial direction at the right end part of the cylindrical roller body, and one end of the N right radial heating holes is connected to the central heating hole, and the other end is correspondingly connected to the N peripheral heating holes; wherein, a section of expansion hole for compensating the thermal deformation error of the roller surface is respectively arranged at the orifice parts at both ends of the peripheral heating hole, and the left radial heating hole is respectively connected to the central heating hole and the peripheral heating hole through the expansion holes at both ends.

2. The roller surface thermal deformation error compensation structure of a lithium battery pole piece working roller according to claim 1, characterized in that: The expanded hole is a cylindrical hole.

3. According to the roller surface thermal deformation error compensation structure of a lithium battery pole piece working roller according to claim 1, the expanded hole is a conical hole with a relatively large hole mouth diameter and a relatively small hole bottom diameter.

4. The roller surface thermal deformation error compensation structure of a lithium battery pole piece working roller according to claim 1, characterized in that: The plurality of peripheral heating holes are evenly spaced along the circumference of the cylindrical roller body.

5. The roller surface thermal deformation error compensation structure of a lithium battery pole piece working roller according to claim 1, characterized in that: The left radial heating hole and the right radial heating hole are respectively inclined toward the inner direction of the cylindrical roller body. The left radial heating hole is inclined inwardly by 55 to 65 degrees relative to the left end surface of the cylindrical roller body, and the right radial heating hole is inclined inwardly by 55 to 65 degrees relative to the right end surface of the cylindrical roller body.

6. The roller surface thermal deformation error compensation structure of a lithium battery pole piece working roller according to claim 1, characterized in that: The shaft heads at both ends of the cylindrical roller body are respectively coaxially and integrally connected with the cylindrical roller body.

7. The roller surface thermal deformation error compensation structure of a lithium battery pole piece working roller according to claim 1, characterized in that: The left and right end surfaces of the cylindrical roller body are respectively provided with sealing cover plates for sealing the openings at both ends of the peripheral heating holes; the left and right end surfaces of the cylindrical roller body are respectively coated with a layer of thermal insulation coating, and the sealing cover plates are coated with a layer of thermal insulation coating.

8. The roller surface thermal deformation error compensation structure of a lithium battery pole piece working roller according to claim 1, characterized in that: The central heating hole is an axial blind hole opened from the left end of the lithium battery pole piece working roller toward the inner direction of the cylindrical roller body, and a hot oil inlet pipe is inserted into the central heating hole, the right end opening of the hot oil inlet pipe is closed, a section of the outer circle at the right end of the hot oil inlet pipe is sealingly connected to the central heating hole, and N oil delivery distribution holes corresponding to the N right-end radial heating holes are arranged on a section of the outer circle at the right end of the hot oil inlet pipe, and a gap is arranged between the left part of the hot oil inlet pipe and the central heating hole to form a hot oil reflux channel for hot oil to flow back from the N left-end radial heating holes to the central heating hole.

9. The roller surface thermal deformation error compensation structure of a lithium battery pole piece working roller according to claim 1, characterized in that: The specification parameters of the number and size of the peripheral heating holes are obtained by conducting a hot test on the lithium battery pole piece working roller at a specified working temperature.

10. The roller surface thermal deformation error compensation structure of a lithium battery pole piece working roller according to claim 1, characterized in that: The lithium battery pole piece working roller is also used as a working roller for rolling other foil plates except the foil plates for battery pole pieces.

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