Calendering roller for dry-method electrode
By setting multiple coaxial hot runners inside the calendering roll and utilizing the design of inlet and outlet liquid channels, the problem of uneven heating is solved, ensuring the uniformity and stability of electrode forming quality.
Patent Information
- Application Number
- CN202423004052.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-06
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-12-06
AI Technical Summary
Traditional calendering rolls suffer from uneven heating during the heating process, resulting in uneven thermal expansion and contraction on the surface of the calendering roll, which affects the quality of electrode forming.
Design a calendering roll with multiple hot runner channels on coaxial cylindrical surfaces inside the roll. These channels are connected by inlet and outlet channels. The hot runner channels are close to the roll surface and separated by a baffle assembly to ensure uniform distribution of the hot fluid and achieve uniform heating of the roll surface.
This achieves uniform heat distribution on the roller surface, avoids deformation, and improves electrode forming quality.
Smart Images
Figure CN223665466U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to lithium battery production technical field, especially a kind of calender roll for dry method electrode. BACKGROUND
[0002] Lithium ion battery is one of the most important energy storage technologies today, and is widely used in electric vehicles, portable electronic devices and energy storage systems and other fields. With the increasing demand for high energy density and environmental performance, lithium battery manufacturing process is developing towards more green, economic and efficient direction. Dry electrode manufacturing technology, as a new technology, has gradually attracted attention in the industry due to its significant energy-saving and environmental advantages.
[0003] Traditional wet electrode manufacturing requires the use of organic solvents (such as NMP) to mix active materials, conductive agents and binders to form a slurry, which is then coated on the surface of a metal current collector. This process not only requires an expensive solvent recovery system, but also requires a large amount of energy for the drying process. In addition, the volatility of the solvent can potentially harm the environment and the health of the operators. Dry electrode technology, on the other hand, directly forms a coating layer of active materials and binders through physical processing without the need for solvents, fundamentally solving these problems.
[0004] In the dry electrode manufacturing process, the calendering process is one of the key steps. Its role is to apply pressure to the electrode material through mechanical force, forming a dense and uniform coating on the surface of the metal current collector, thereby improving the conductivity and mechanical strength of the electrode. The calender roll needs to be heated during use. Uneven heating can cause uneven deformation of the calender roll surface due to thermal expansion and contraction, affecting the quality of electrode formation. Therefore, how to provide a calender roll that is evenly heated has become a problem to be solved. SUMMARY
[0005] In view of the above deficiencies of the prior art, the technical problem to be solved by the utility model is to provide a calender roll with a reasonable structure design, which can be evenly heated and is beneficial to ensuring the quality of electrode formation.
[0006] To solve the above technical problems, the utility model adopts the following technical solutions:
[0007] A calender roll for dry method electrode, comprising a roller and a roller shaft coaxially arranged at both ends of the roller, the roller has a plurality of hot runners uniformly arranged on the coaxial cylindrical surface, the hot runners are close to the surface of the roller, and the two ends extend to both ends of the roller; a liquid inlet channel and a liquid outlet channel are coaxially arranged on the roller, and a blocking component is arranged between the liquid inlet channel and the liquid outlet channel; one end of the hot runner is connected to the liquid inlet channel through a first channel, and the other end is connected to the liquid outlet channel through a second channel; one end of the liquid inlet channel and the liquid outlet channel penetrates the roller shaft.
[0008] In the above structure, multiple hot runners within the roller are located on a coaxial cylindrical surface, close to the roller's surface. The two ends of each hot runner are connected to an inlet flow channel and an outlet flow channel, respectively. Hot fluid can flow into the hot runners through the inlet flow channel to heat the roller surface, and then converge and flow out through the outlet flow channel. Simultaneously, the evenly distributed hot runners ensure more uniform heat distribution on the roller surface, thus preventing roller deformation and contributing to ensuring electrode forming quality.
[0009] Furthermore, the orifice diameter of the liquid outlet channel is 3 / 4 to 4 / 5 of that of the liquid inlet channel.
[0010] By setting the orifice diameter of the liquid outlet channel to be smaller, a certain pressure change can be formed at the outlet end of the hot runner, which allows the hot fluid to flow into the hot runner more evenly and makes the temperature in each hot runner more uniform.
[0011] Furthermore, the inlet channel and the outlet channel are coaxially arranged at both ends of the roller, and the partition assembly is formed between the opposite ends of the two, while the other ends pass through the corresponding roller shafts.
[0012] Furthermore, the hot runner extends axially along the roller and is provided in multiple manner evenly distributed along the circumference of the roller.
[0013] Furthermore, the hot runner is arranged in a spiral shape inside the roller.
[0014] Furthermore, both the first flow channel and the second flow channel are arranged radially inside the roller.
[0015] Furthermore, both ends of the roller have coaxially arranged annular sealing grooves, and the end of the hot runner is located inside the annular sealing groove; a sealing end cap is fitted on the annular sealing groove, and the sealing end cap has a first connecting hole corresponding to the hot runner, and the inner end of the first connecting hole is provided with a second connecting hole for communicating with the first flow channel or the second flow channel in a radially inward manner.
[0016] Furthermore, the sealing end cap has bolt holes that extend through the axial direction and are evenly distributed circumferentially on the sealing end cap; the annular sealing groove has threaded holes corresponding to the bolt holes, and the sealing end cap is installed in the annular sealing groove by bolts.
[0017] Furthermore, a sealing ring is provided at the end of the hot runner, and the sealing ring is sealed between the hot runner and the first connecting hole.
[0018] Furthermore, the inner wall of the sealing end cap has an annular guide groove, and the second connecting hole is located inside the annular guide groove; the two sides of the annular guide groove are sealed and fitted on the roller shaft.
[0019] In summary, this utility model has the advantages of reasonable structural design, uniform heating, and ensuring electrode forming quality. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall structure of this embodiment.
[0021] Figure 2 for Figure 1 A cross-sectional structural diagram.
[0022] Figure 3 and Figure 4 for Figure 2 A magnified view of a portion of the image. Detailed Implementation
[0023] The present invention will be further described in detail below with reference to the embodiments.
[0024] In practical implementation: such as Figures 1-4 As shown, a calendering roll for a dry electrode includes a roll 1 and a roller shaft 2 coaxially disposed at both ends of the roll 1. The roll 1 has a plurality of hot runner channels 3 evenly distributed on a coaxial cylindrical surface. The hot runner channels 3 are close to the surface of the roll 1 and extend to both ends of the roll 1. The roll 1 is coaxially provided with an inlet channel 4 and an outlet channel 5, and a baffle assembly 6 is disposed between the inlet channel 4 and the outlet channel 5. One end of the hot runner channel 3 is connected to the inlet channel 4 through a first channel 7, and the other end is connected to the outlet channel 5 through a second channel 8. One end of the inlet channel 4 and the outlet channel 5 passes through the roller shaft 2, and the aperture of the outlet channel 5 is 3 / 4 to 4 / 5 of that of the inlet channel 4. In this embodiment, the inlet channel 4 and the outlet channel 5 are coaxially arranged at both ends of the roller 1, and the partition assembly 6 is formed between the opposite ends of the two, while the other ends pass through the corresponding roller shafts 2.
[0025] In the above structure, multiple hot runners within the roller are located on a coaxial cylindrical surface, close to the roller's surface. The two ends of each hot runner are connected to an inlet channel and an outlet channel, respectively. Hot fluid flows into the hot runners through the inlet channel to heat the roller surface and then flows out through the outlet channel. Simultaneously, the evenly distributed hot runners ensure more uniform heat distribution on the roller surface, preventing roller deformation and improving electrode forming quality. The smaller orifice diameter of the outlet channel creates a pressure change at the outlet end, allowing for better even distribution of the hot fluid within the hot runners and resulting in more uniform temperature distribution throughout the channels.
[0026] The hot runner 3 extends axially along the roller 1 and is provided in multiple circumferentially distributed manner. The first flow channel 7 and the second flow channel 8 are both radially disposed within the roller 1. Specifically, both ends of the roller 1 have coaxially arranged annular sealing grooves, and the end of the hot runner 3 is located within the annular sealing groove. A sealing end cap 9 is fitted onto the annular sealing groove. The sealing end cap 9 has a first connecting hole corresponding to the hot runner 3, and the inner end of the first connecting hole has a second connecting hole radially inwardly connected to either the first flow channel 7 or the second flow channel 8. The sealing end cap 9 has bolt holes axially extending through it, and these bolt holes are circumferentially distributed on the sealing end cap 9. The annular sealing groove has threaded holes corresponding to the bolt holes, and the sealing end cap 9 is bolted into the annular sealing groove. A sealing ring is provided at the end of the hot runner 3, and the sealing ring is sealingly fitted between the hot runner 3 and the first connecting hole. The inner wall of the sealing end cap 9 has an annular guide groove, and the second connecting hole is located in the annular guide groove; the two sides of the annular guide groove are sealed and fitted on the roller shaft 2.
[0027] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A calendering roll for dry electrode processing, characterized in that, The device includes a roller (1) and roller shafts (2) coaxially disposed at both ends of the roller (1). The roller (1) has a plurality of hot runners (3) evenly distributed on the coaxial cylindrical surface. The hot runners (3) are close to the surface of the roller (1) and extend to both ends of the roller (1). The roller (1) is coaxially disposed with an inlet flow channel (4) and an outlet flow channel (5). A baffle assembly (6) is disposed between the inlet flow channel (4) and the outlet flow channel (5). One end of the hot runner (3) is connected to the inlet flow channel (4) through a first flow channel (7), and the other end is connected to the outlet flow channel (5) through a second flow channel (8). One end of the inlet flow channel (4) and the outlet flow channel (5) passes through the roller shaft (2).
2. The calendering roll for dry electrode as described in claim 1, characterized in that, The diameter of the outlet channel (5) is 3 / 4 to 4 / 5 of that of the inlet channel (4).
3. The calendering roll for dry electrode as described in claim 1, characterized in that, The inlet channel (4) and outlet channel (5) are coaxially arranged at both ends of the roller (1), and the partition assembly (6) is formed between the opposite ends of the two, while the other ends pass through the corresponding roller shaft (2).
4. The calendering roll for dry electrode as described in claim 1, characterized in that, The hot runner (3) extends along the axial direction of the roller (1) and is provided in multiple ways along the circumference of the roller (1).
5. The calendering roll for dry electrode as described in claim 1, characterized in that, The hot runner (3) is spirally arranged inside the roller (1).
6. The calendering roll for dry electrode as described in claim 4 or 5, characterized in that, The first flow channel (7) and the second flow channel (8) are both arranged radially inside the roller (1).
7. The calendering roll for dry electrode as described in claim 6, characterized in that, Both ends of the roller (1) have coaxially arranged annular sealing grooves, and the end of the hot runner (3) is located in the annular sealing groove; a sealing end cap (9) is fitted on the annular sealing groove, and the sealing end cap (9) has a first connecting hole corresponding to the hot runner (3), and the inner end of the first connecting hole is provided with a second connecting hole for corresponding communication with the first runner (7) or the second runner (8) through radially inward.
8. The calendering roll for dry electrode as described in claim 7, characterized in that, The sealing end cap (9) has bolt holes that are axially through it, and the bolt holes are evenly distributed circumferentially on the sealing end cap (9); the annular sealing groove has threaded holes that correspond to the bolt holes, and the sealing end cap (9) is installed in the annular sealing groove by bolts.
9. The calendering roll for dry electrode as described in claim 7, characterized in that, A sealing ring is provided at the end of the hot runner (3), and the sealing ring is sealed between the hot runner (3) and the first connecting hole.
10. The calendering roll for dry electrode as described in claim 7, characterized in that, The inner wall of the sealing end cap (9) has an annular guide groove, and the second connecting hole is located in the annular guide groove; the two sides of the annular guide groove are sealed and fitted on the roller shaft (2).