Heating roller

Abstract

The utility model discloses a heating roller. The heating roller comprises an outer baffle, an inner baffle and a heat conduction roller body, the outer baffles are fixed to the two ends of the heat conduction roller body through the inner baffles. An inlet channel, an outlet channel and a heat conduction flow path system are arranged in an inner cavity of the heat conduction roller body. The inlet channel and the outlet channel are communicated through a heat conduction flow path system; through a double fixing structure of the outer baffle and the inner baffle, the end sealing performance and the overall stability of the roller body are enhanced; the heat-conducting flow path system is communicated with the inlet and outlet channels to form a closed-loop heat-conducting path, so that efficient circulation of heat-conducting media such as hot oil is ensured, the roller surface heating uniformity is improved, and local temperature difference is avoided; the pole piece is prevented from wrinkling and the quality of the pole piece is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to a heating roller. Background Technology

[0002] In existing technologies, heated rollers are commonly used to roll the battery electrodes. The purpose of this is to dry the battery electrodes, reduce the moisture content, and after heating, the adhesive on the battery electrodes softens or melts. Rolling can enhance the adhesion between the active material and the current collector. However, the heated rollers currently used have uneven heating on the roller surface, resulting in uneven heating of the coated blank areas of the electrodes. This leads to poor electrode quality, poor ductility, and a tendency to wrinkle.

[0003] In the "Rolling Device and Rolling Method" disclosed in CN115832165B, the rolling device includes: an extension roller for rolling the tab area of ​​the electrode sheet; and a heating unit for heating the tab area of ​​the electrode sheet on the extension roller. The heating unit has a heating surface facing the extension roller, which is an arc surface extending around the central axis of the extension roller. However, during heating, the above device requires precise control of the distance between the heating unit and the extension roller to ensure the uniformity and stability of heating; insufficient heating precision may lead to uneven heating of the electrode sheet, affecting product quality. Utility Model Content

[0004] To overcome the shortcomings of the prior art, a heating roller is provided.

[0005] The technical solution of this utility model is as follows: a heating roller, which includes an outer baffle, an inner baffle, and a heat conduction roller body; the outer baffle is fixed to both ends of the heat conduction roller body through the inner baffle, and the inner cavity of the heat conduction roller body is provided with an inlet channel, an outlet channel, and a heat conduction flow path system; the inlet channel and the outlet channel are connected through the heat conduction flow path system.

[0006] Preferably, the heat conduction flow path system includes a straight through hole, an oblique through hole group, and a confluence channel; the oblique through hole group is used to connect the inlet channel with the straight through hole and the outlet channel with the straight through hole; the confluence channel is mounted on the inner baffle and is used to connect two adjacent straight through holes, and the two adjacent straight through holes are not connected to the oblique through hole group.

[0007] Preferably, the oblique through-hole group includes an inlet oblique through-hole and an outlet oblique through-hole; the inlet oblique through-hole and the outlet oblique through-hole are arranged alternately in the length direction of the heat conduction roller.

[0008] Preferably, the position of the outlet oblique through hole is offset from the inlet oblique through hole by a distance equal to that of a straight through hole.

[0009] Preferably, the straight-through holes, the inlet inclined holes and the outlet inclined holes are arranged in multiples of 3.

[0010] Preferably, the straight-through holes are arranged axially along the length direction of the heat conduction roller body, and the straight-through holes are evenly distributed along the circumferential direction of the outlet channel.

[0011] Preferably, the number of the inlet inclined holes and the outlet inclined holes is 1 / 3 of the number of the straight-through holes.

[0012] Preferably, the cross section of the converging channel is long arc-shaped.

[0013] Preferably, the inclined angle of the inclined hole group is an acute angle, and the inclined angle is inclined relative to the axis of the heat conduction roller body.

[0014] Preferably, the number of the converging channels is equal to the number of the inlet inclined holes.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] A heating roller is fixed by a double fixing structure of an outer baffle and an inner baffle, the sealing property and the overall stability of the roller body end are enhanced, the inlet and the outlet channels are connected by a heat conduction flow path system, a closed loop heat conduction path is formed, the efficient circulation of a heat conducting medium such as hot oil is ensured, the heating uniformity of the roller surface is improved, and local temperature difference is avoided, the phenomenon of wrinkles of the pole piece is avoided, and the quality of the pole piece is improved.

[0017] Further, the sectional design of the straight-through holes and the inclined hole group prolongs the flow path of the heat conducting medium in the roller body, and increases the heat exchange time; the converging channel connects adjacent straight-through holes but avoids the inclined holes, avoids flow path short circuit, ensures layered heat transfer, and improves heat energy utilization rate.

[0018] Further, the inlet and outlet inclined holes are arranged alternately, so that the heat conducting medium forms a zigzag flow in the axial direction of the roller body, the contact area with the inner wall of the roller body is expanded, the heat conduction efficiency is enhanced, and flow dead angle is reduced.

[0019] Further, the outlet inclined holes are designed to be offset, so that adjacent flow paths are distributed in axial staggered manner, the heat conduction path is avoided to overlap, the uniformity of the circumferential temperature of the roller body is further improved, and the heating scene of wide material is applicable.

[0020] Further, the number of holes is a multiple of 3, so that the roller body is symmetrically distributed in the circumferential direction, the fluid pressure and thermal stress are balanced, the risk of structural deformation is reduced, and standard processing is facilitated.

[0021] Further, the straight-through holes are arranged axially and evenly distributed in the circumferential direction, so that the radial thermal expansion of the roller body is uniform, the bending deformation caused by temperature difference is reduced, and the service life is prolonged; the circumferential flow is uniform, and local overheating is avoided.

[0022] Further, the number of import and export inclined through holes is 1 / 3 of the number of straight through holes, the single-hole flow distribution is optimized, the turbulent flow caused by high flow velocity at the inlet / outlet of the straight through hole is avoided, the pumping energy consumption is reduced, and meanwhile the heat exchange consistency of each flow path is ensured.

[0023] Further, the long arc-shaped converging channel reduces the fluid resistance caused by sharp turns, and guides the medium to turn gently, thereby reducing the pressure loss.

[0024] Further, the inclined through hole is designed to be inclined at an acute angle, the medium is guided to flow to the end of the roller body by using fluid inertia, the axial temperature attenuation is compensated, and the temperature consistency between the two ends and the middle part is ensured.

[0025] Further, the number of converging channels matches the number of import inclined through holes, each import flow path has a corresponding converging path, the multi-flow path interference is avoided, the system flow balance is maintained, and the coking caused by local flow stagnation is prevented.

[0026] Other features and advantages of the utility model will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0027] The utility model will be further described in combination with the drawings:

[0028] Figure 1 It is an explosion schematic view of the structure of the heating roller of the utility model;

[0029] Figure 2 It is a sectional view schematic view of the heating roller of the utility model;

[0030] Figure 3 It is the front view A of the heat conduction roller body of the utility model from the import channel direction;

[0031] Figure 4 It is the front view B of the heat conduction roller body of the utility model from the export channel direction;

[0032] Figure 5 It is the front view A of the inner baffle of the utility model;

[0033] Figure 6 It is the front view B of the inner baffle of the utility model;

[0034] Figure 7 It is the total structure schematic view of the belt pressing device of the utility model;

[0035] The following is the explanation of the reference signs:

[0036] Heating roller 1, outer baffle 2, inner baffle 3, heat conduction roller body 4, inlet channel 41, outlet channel 42, heat conduction flow path system 43, straight through hole 431, oblique through hole group 432, inlet oblique through hole 4321, outlet oblique through hole 4322, confluence channel 433, pressing mechanism 5, side plate 6, cylinder 7. Detailed Implementation

[0037] The technical solutions of the present utility model will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present utility model.

[0038] In the following description, terms such as “inner,” “outer,” “upper,” “lower,” “left,” and “right” are used only to facilitate the description of the embodiments and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0039] like Figures 1 to 2 As shown, the heating roller 1 mainly consists of an outer baffle 2, an inner baffle 3, and a heat conduction roller body 4. The outer baffle 2 is fixed on the inner baffle 3, and the inner baffle 3 is connected to both ends of the heat conduction roller body 4 to form a sealed structure. The heat conduction roller body 4 has an axially penetrating inlet channel 41 and an outlet channel 42 inside, which are connected by a heat conduction flow path system 43 to form a closed-loop heat circulation path.

[0040] The heat conduction flow path system 43 includes straight through holes 431, oblique through holes group 432 and confluence channel 433; wherein, the straight through holes 431 are evenly distributed along the axial direction of the heat conduction roller body 4, and their number is a multiple of 3, and they are evenly distributed around the outlet channel 42 in the circumferential direction.

[0041] The oblique through-hole group 432 includes an inlet oblique through-hole 4321 and an outlet oblique through-hole 4322. The number of oblique through-hole groups 432 is one-third the number of straight through-holes. The inlet oblique through-hole 4321 and the outlet oblique through-hole 4322 are arranged alternately along the length of the roller body, and the outlet oblique through-hole 4322 is offset relative to the inlet oblique through-hole 4321 by a circumferential distance of one straight through-hole 431.

[0042] The confluence channel 433 is located inside the inner baffle 3, and its number is equal to the number of inlet oblique through holes. Its cross-section is long arc-shaped. It is used to connect two adjacent straight through holes 431 and avoids the interference area of ​​the oblique through hole group 432.

[0043] The angle between the inclined through-hole group 432 and the axis of the heat conduction roller 4 is an acute angle, guiding the fluid to flow axially. In this embodiment, the angle of the inclined through-hole group 432 is typically set to 50° to 70°.

[0044] The process of injecting the heat transfer medium into the heating roller is as follows: High-temperature heat transfer oil or steam enters from the inlet channel 41 and is diverted to the straight through-hole 431 through the inlet oblique through-hole 4321. The heat transfer oil flows axially along the straight through-hole 431 to the other end of the heat transfer roller 4, and is redirected to the adjacent straight through-hole 431 through the confluence channel 433, forming an "S"-shaped return path. During the return process, the heat transfer oil flows into the outlet channel 42 through the outlet oblique through-hole 4322 and is finally discharged from the roller. During the heat transfer process, the heat transfer oil comes into full contact with the inner wall of the heat transfer roller 4 in the alternating flow of the oblique through-hole group 432 and the straight through-hole 431, and the heat is conducted to the outer surface through the roller material, achieving uniform heating of the heated material such as the electrode sheet.

[0045] like Figures 3 to 6 As shown, Figure 3 This is a front view (side A) of the heat transfer roller from the direction of the inlet channel; Figure 4 This is a front view (side B) of the heat transfer roller from the direction of the outlet channel. Figure 5 A front view of the heat transfer roller from the inlet channel direction after the inner baffle is installed; Figure 6 The front view (side B) of the heat transfer roller body from the outlet channel direction after the inner baffle is installed.

[0046] Working principle: Hot oil enters from the inlet, fills the inlet pipe, then enters the straight through hole k1 through the oblique through hole a1, then enters the B-side confluence channel fn, then enters the straight through hole kn through the confluence channel fn, then flows back to the A-side confluence channel qn, then enters the B-side oblique through hole bn through k(n-1) and flows out to the outlet. This process continues, with hot oil flowing from a1 to an until the entire roller is filled with hot oil, and then flowing out from the outlet.

[0047] Among them, the number of through holes K1 to kn satisfies kn=3n. In order to make the temperature distribution of the roller surface uniform, n can be n≥5, and n=6 in the example. The number of oblique through holes a1 to an satisfies an=kn / 3, and the angle of the oblique through holes can be 50° to 70°. The number of oblique through holes b1 to bn satisfies bn=an. The oblique through hole b is offset relative to the oblique through hole a, and its position is different from the distance of one through hole k. For example, the position of a1 corresponds to the through hole k1, and the position of b1 corresponds to the through hole k2. In surface A: the number of confluence channels q1 to qn satisfies qn=an, and one confluence channel connects two straight through holes. For example, q1 connects k2 and k3. The confluence channel is not connected to the oblique through hole. Similarly, in surface B: the number of confluence channels f1 to fn satisfies fn=bn. It is also a confluence channel that connects two straight through holes. For example, f1 connects k3 and k4. The confluence channel is not connected to the oblique through hole group.

[0048] like Figure 7 As shown, a heating roller is used in the rolling operation of battery electrodes. The rolling operation also includes a pressing mechanism 5, a side plate 6, and a cylinder 7. The pressing mechanism 5 and the heating roller 1 are fixed between two side plates 6. The cylinder 7 is mounted on the side plate 6 and connected to the pressing mechanism 5. The cylinder 7 drives the pressing mechanism 5 to rotate and perform the rolling operation on the electrode. During the rolling operation, the surface of the heat conduction roller 4 is heated evenly through the heat conduction flow path system 43 in the heat conduction roller body 4, avoiding local temperature differences that cause electrode wrinkles and improving electrode quality.

[0049] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the content described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A heating roller characterized by: The heating roller (1) comprises an outer baffle (2), an inner baffle (3) and a heat-conducting roller body (4); the outer baffle (2) is fixed to both ends of the heat-conducting roller body (4) through the inner baffle (3), and the inner cavity of the heat-conducting roller body (4) is provided with an inlet channel (41), an outlet channel (42) and a heat-conducting flow path system (43); the inlet channel (41) and the outlet channel (42) are communicated through the heat-conducting flow path system (43).

2. A heating roller as claimed in claim 1, characterized in that: The heat-conducting flow path system (43) comprises straight-through holes (431), inclined-through hole groups (432) and converging flow channels (433); the inclined-through hole groups (432) are used for communicating the inlet channel (41) and the straight-through holes (431), and the outlet channel (42) and the straight-through holes (431); the converging flow channels (433) are assembled on the inner baffle and are used for communicating two adjacent straight-through holes (431), and the two adjacent straight-through holes (431) are not communicated with the inclined-through hole groups (432).

3. A heating roller as claimed in claim 2, characterized in that: The inclined-through hole groups (432) comprise inlet inclined-through holes (4321) and outlet inclined-through holes (4322); the inlet inclined-through holes (4321) and the outlet inclined-through holes (4322) are alternately arranged in the length direction of the heat-conducting roller body (4).

4. A heating roller as claimed in claim 3, characterized in that: The position of the outlet inclined-through hole (4322) is offset from the inlet inclined-through hole (4321) by the distance of one straight-through hole (431).

5. A heating roller as claimed in claim 2, characterized in that: The straight-through holes (431), the inlet inclined-through holes (4321) and the outlet inclined-through holes (4322) are respectively provided with a plurality of holes, and the number of the holes is a multiple of 3.

6. A heating roller as claimed in claim 2, characterized in that: The straight-through holes (431) are arranged in the axial direction along the length direction of the heat-conducting roller body (4); and the plurality of straight-through holes (431) are uniformly distributed along the circumcenter of the outlet channel (42).

7. A heating roller as claimed in claim 3, wherein: The number of the inlet inclined-through holes (4321) and the outlet inclined-through holes (4322) is 1 / 3 of the number of the straight-through holes (431).

8. A heating roller as claimed in claim 2, wherein: The cross section of the converging flow channel (433) is a long arc.

9. A heating roller as claimed in claim 2, wherein: The inclined angle of the inclined-through hole group (432) is an acute angle, and the inclined angle is inclined relative to the axis of the heat-conducting roller body (4).

10. A heating roller as claimed in claim 2, wherein: The number of the converging flow channels (433) is equal to the number of the inlet inclined-through holes (4321).

Images