Pole piece rolling device and pole piece rolling machine
By introducing the thermally conductive connection between the water-cooled assembly and the rolling assembly into the pole-sheet rolling device, the problem of uncontrollable roll temperature is solved, and the stability of the roll temperature is achieved, thereby improving the consistency of the pole-sheet thickness and yield rate.
Patent Information
- Application Number
- CN202420204999.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-26
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-01-26
AI Technical Summary
During the rolling process of the electrode sheet, the roll temperature is uncontrollable, causing the roll gap to change with the temperature, affecting the consistency of the thickness of the electrode sheet and reducing the yield of the electrode sheet.
An extreme sheet rolling device is designed, including a rolling roll assembly and a water cooling assembly. The rolling roller assembly consists of a first roll and a second roll, and the water-cooled assembly is thermally connected to the rolling roller assembly, and the liquid flow rate is adjusted through a regulating valve to maintain the rolling roller temperature stable.
By keeping the roll temperature constant, the influence of thermal expansion and contraction on the roll slots is reduced, and the consistency of the roll slot size is ensured, thereby improving the thickness consistency of the pole sheet in the transverse and longitudinal directions, and improving the yield of the pole sheet.
Smart Images
Figure CN222554325U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lithium battery pole piece manufacturing, and more specifically to a pole piece rolling device and a pole piece rolling machine. Background Art
[0002] As people's needs continue to upgrade, technology is constantly updated and iterated. The public's requirements for battery quality are getting higher and higher. The rapid iteration of batteries has put forward higher requirements for battery quality and battery life. The purpose of the rolling process is to make the active material and the foil, and the active material more closely combined, with uniform thickness, convenient battery assembly, and higher capacity of the same volume. The uniformity of the thickness of the pole piece and the compaction density are positively correlated with the quality and energy density of the battery.
[0003] The battery models and formulas of different battery manufacturers are different, and the sensitivity of the pole pieces to the pressure and gap of rolling will vary. Therefore, it is necessary to improve the stable state requirements of the equipment. The pressure of rolling the pole pieces can be monitored online through the hydraulic system. The actual gap is related to the cumulative assembly error of the equipment, which can be eliminated by recalibrating the program. However, when the rollers work on the pole pieces, the temperature is uncontrollable, resulting in uncontrollable variable thermal expansion and contraction of the components, causing the roller gap to continue to change with the change in temperature, making it relatively difficult to keep the lateral and longitudinal thickness of the pole pieces consistent, reducing the yield rate of the pole pieces. Utility Model Content
[0004] The utility model provides a pole piece rolling device and a pole piece rolling machine to solve the problems existing in the above-mentioned background technology.
[0005] The technical solution adopted by the utility model is:
[0006] In a first aspect, a pole piece rolling device comprises a mounting frame and a roller assembly mounted on the mounting frame, the roller assembly comprising a first roller and a second roller, the first roller and the second roller being arranged opposite to each other; and a water cooling assembly mounted on one side of the mounting frame, the water cooling assembly being connected to the mounting frame, the water cooling assembly being provided with a regulating valve for adjusting liquid flow; the water cooling assembly is thermally connected to the roller assembly to maintain the temperature of the roller stable.
[0007] In some embodiments of the present application, the rolling roller assembly also includes a bearing seat, which is respectively arranged at the end of the first rolling roller and the second rolling roller, a pipeline is opened inside the bearing seat, and a first water inlet and a first return port are provided on one side of the bearing seat, and the first water inlet and the first return port are connected through the pipeline.
[0008] In some embodiments of the present application, a temperature sensor is also provided on the bearing seat.
[0009] In some embodiments of the present application, the water cooling component includes a water cooling pipe, the water cooling is provided with a second water inlet and a second return port for connecting with an external pipeline, and the regulating valve is arranged on one side of the second water inlet and the second return port; the water cooling pipe is also provided with a plurality of water outlets and a third return port, the water outlet is connected to the first water inlet, and the third return port is connected to the first return port.
[0010] In some embodiments of the present application, a flow switch for monitoring liquid flow is provided on the water cooling pipe.
[0011] In some embodiments of the present application, a fluid solenoid valve is provided on a side of the second water inlet close to the tube body.
[0012] In some embodiments of the present application, a thickness gauge for detecting the thickness of the pole piece is also provided on one side of the roller assembly.
[0013] In some embodiments of the present application, the roller assembly further includes a first drive assembly, which is transmission-connected to the second roller for adjusting the spacing between the second roller and the first roller.
[0014] In some embodiments of the present application, a second driving assembly is disposed at the end of each of the first roller and the second roller to drive the first roller and the second roller to rotate.
[0015] In a second aspect, a pole piece rolling machine is provided, comprising a rolling machine body and a pole piece rolling device as described in any one of the above technical solutions.
[0016] Compared with the prior art, the roller assembly of the utility model includes a first roller and a second roller to roll the pole piece. The water cooling assembly is thermally connected to the roller assembly to cool down the first roller and the second roller that are overheated during operation. The flow rate of the liquid in the water cooling assembly is adjusted by the regulating valve, so that the temperature of the roller assembly is kept constant during operation, and the influence of thermal expansion and contraction caused by the excessive temperature of the roller assembly on the roller gap is reduced, so that the size of the roller gap is kept consistent during operation, thereby improving the consistency of the thickness of the pole piece rolled out in the horizontal and vertical directions. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the structure of the pole piece rolling device in the embodiment of the present application.
[0018] Figure 2 It is a schematic diagram of the structure of the water cooling component near the second water inlet in an embodiment of the present application.
[0019] Figure 3 It is a schematic diagram of the structure of the water outlet in the embodiment of the present application.
[0020] Figure 4 It is a schematic diagram of the structure of the bearing seat in the embodiment of the present application.
[0021] Description of reference numerals:
[0022] 1-Mounting frame;
[0023] 2-roller assembly; 201-first roller; 202-second roller; 202-bearing seat; 202a-first water inlet; 202b-first return port; 202c-pipeline; 202d-temperature sensor;
[0024] 3-water cooling assembly; 301-regulating valve; 302-water cooling pipe; 302a-second water inlet; 302b-second return port; 302c-water outlet; 302d-third return port; 303e-tube body; 303-flow switch; 304-fluid solenoid valve;
[0025] 4-Thickness gauge;
[0026] 5- first drive assembly;
[0027] 6- Second drive assembly. DETAILED DESCRIPTION
[0028] Example 1
[0029] This embodiment provides a pole piece rolling device, please refer to Figure 1-4 A sheet thickness consistency adjustment device includes a mounting frame 1; a roller assembly 2, mounted on the mounting frame 1, the roller assembly 2 includes a first roller 201 and a second roller 202, the first roller 201 and the second roller 202 are arranged opposite to each other; a water cooling assembly 3, mounted on one side of the mounting frame 1, the water cooling assembly 3 is connected to the mounting frame 1, and a regulating valve 301 for adjusting liquid flow is arranged on the water cooling assembly 3; the roller assembly 2 is thermally connected to the water cooling assembly 3.
[0030] The two sides of the mounting frame 1 are composed of mounting plates, which are hollow inside. The two ends of the first roller 201 and the second roller 202 are arranged on the two sides of the mounting frame 1. There is a gap between the first roller 201 and the second roller 202 to form a rolling channel to roll the raw materials and generate pole pieces. The water cooling component 3 mainly guides the liquid into the roller assembly 2 to cool the first roller 201 and the second roller 202. The liquid is preferably condensed water, which has a better cooling effect. The water cooling component 3 is arranged at the bottom of the mounting frame 1, and is connected to the roller assembly 2 through a pipe 202c. The first roller 201 and the second roller 202 are continuously cooled by the flow of condensed water to keep their temperature constant, thereby maintaining the stability of the roller gap size between the first roller 201 and the second roller 202. The water cooling component 3 is also provided with a regulating valve 301, and the regulating valve 301 is preferably a ball valve to adjust the flow of condensed water, thereby controlling the speed of temperature reduction. During use, the flow rate of the condensed water of the water cooling assembly 3 is controlled by the ball valve, so that the condensed water flows through the first roller 201 and the second roller 202 to control the temperature of the two rollers during operation.
[0031] By setting up a roller assembly 2, the roller assembly 2 includes a first roller 201 and a second roller 202, which can roll the electrode. The water cooling assembly 3 is thermally connected to the roller assembly 2, and the first roller 201 and the second roller 202 are cooled during the working process to keep their temperature constant during the work, prevent the thermal expansion and contraction caused by excessive temperature from affecting the roller gap, ensure that the size of the roller gap remains consistent during the work, and further ensure that the thickness of the rolled electrode remains consistent in the horizontal and vertical directions; wherein, a regulating valve 301 is also provided on the water cooling assembly 3, and the regulating valve 301 can be used to adjust the flow rate of the liquid, and can control the cooling speed of the first roller 201 and the second roller 202 to avoid the flow rate being too fast, resulting in the temperature of the first roller 201 and the second roller 202 being low, affecting the size of the roller gap.
[0032] In some embodiments, the roller assembly 2 further includes a bearing seat 202, which is respectively arranged at the ends of the first roller 201 and the second roller 202, a pipe 202c is provided inside the bearing seat 202, a first water inlet 202a and a first return port 202b are provided on one side of the bearing seat 202, and the first water inlet 202a and the first return port 202b are connected through the pipe 202c. By cooling the bearing seat 202, the first roller 201 and the second roller 202 are cooled. Specifically, there are multiple bearing seats 202, preferably four, which are respectively arranged at both ends of the first roller 201 and the second roller 202. When working, the first roller 201 and the second roller 202 generate heat, and at this time, the bearing seat 202 can cool both ends well. The surface of the bearing seat 202 is provided with a first water inlet 202a and a second return port 302b, which are specifically connected to the water cooling assembly 3 so that condensed water can smoothly enter the bearing seat 202. The interior of the bearing seat 202 is provided with pipes 202c, through which condensed water flows. The pipes 202c are evenly arranged inside the bearing seat 202 to ensure that condensed water can evenly flow through the side of the bearing seat 202 facing the first roller 201 and the second roller 202, thereby improving the cooling effect. The pipes 202c inside the bearing seat 202 connect the first water inlet 202a and the first return port 202b, so that condensed water enters from the first water inlet 202a, flows through the pipes 202c, and then flows out from the first return port 202b for circulation.
[0033] Preferably, a temperature sensor 202d is also provided on the bearing seat 202. The temperature sensor 202d is arranged on one side of the bearing seat 202, and the temperature sensor 202d can read the temperature of the bearing seat 202 in real time and feed back the data, so that the staff can perceive the working status of the first roller 201 and the second roller 202 more clearly.
[0034] Specifically, the water cooling component 3 includes a water cooling pipe 302, one end of which is provided with a second water inlet 302a and a second return port 302b, and the regulating valve 301 is arranged on one side of the second water inlet 302a and the second return port 302b; a water outlet 302c and a third return port 302d are provided on the tube body 303e of the water cooling pipe 302, the water outlet 302c is connected to the first water inlet 202a, and the third return port 302d is connected to the first return port 202b. A specific design method is provided, which includes a water-cooling pipe 302, and the end of the water-cooling pipe 302 is provided with a second water inlet 302a and a second return port 302b, and regulating valves 301 are respectively arranged on both sides thereof, and the return port and the water inlet can be controlled respectively, and a water outlet 302c and a third return port 302d are arranged on the pipe body 303e, and two water outlets 302c and two third return ports 302d are respectively arranged, which are connected to the bearing seats 202 at both ends of the first roller 201 and the second roller 202. During use, first connect the water outlet 302c and the first water inlet 202a on the bearing seat 202, connect the second return port 302b and the third return port 302d, and the condensed water flows in from the second water inlet 302a on the water cooling pipe 302, flows into the interior of the bearing seat 202 from the water outlet 302c, flows out from the first return port 202b to the third return port 302d, and the condensed water in the third return port 302d flows out from the second return port 302b, thereby completing a cycle.
[0035] Preferably, a flow switch 303 for monitoring the liquid flow is provided on the water cooling pipe 302. The flow switch 303 is arranged on one side of the second reflux port 302b to detect the flow of condensed water.
[0036] Furthermore, a fluid solenoid valve 304 is provided on one side of the second water inlet 302a close to the tube body 303e, and the fluid solenoid valve 304 is used to control the opening and closing of the second water inlet 302a. A thickness gauge 4 for detecting the thickness of the pole piece is also provided on one side of the roller assembly 2, and the thickness gauge 4 is used to detect the thickness of the pole piece pressed out by the roller to further ensure the quality of the pole piece.
[0037] Example 2
[0038] Example 2 is similar to Example 1, except that Figure 1 As shown, the roller assembly 2 further includes a first drive assembly 5, which is in transmission connection with the second roller 202 so that the second roller 202 moves relative to the first roller 201. Specifically, the first drive assembly 5 is used to adjust the size of the roller gap. Preferably, the first drive assembly 5 is a hydraulic cylinder, which is respectively arranged at both ends of the second roller 202 to lift and lower the second roller 202, thereby changing the size of the roller gap between the second roller 202 and the first roller 201.
[0039] Furthermore, the ends of the first roller 201 and the second roller 202 are both provided with a second driving assembly 6 to drive the first roller 201 and the second roller 202 to rotate. The second driving assembly 6 is used to drive the rollers to rotate, so as to perform roll forming on the raw material. Preferably, the second driving assembly 6 selects a driving motor, which is respectively connected to the first roller 201 and the second roller 202 to drive the first roller 201 and the second roller 202 to rotate.
[0040] During use, the hydraulic cylinder rises, adjusts the size of the roller gap between the first roller 201 and the second roller 202, drives the motor to operate, drives the first roller 201 and the second roller 202 to rotate, the first roller 201 and the second roller 202 do work on the pole piece, and the rolling friction of the bearing in the bearing seat 202 generates heat; during the heating process, the first roller 201 and the second roller 202 accumulate thermal expansion deformation, so that the gap between the first roller 201 and the second roller 202 becomes smaller, and the consistency of the longitudinal thickness of the pole piece decreases; due to the difference in the structure of the operating side and the transmission side of the first roller 201 and the second roller 202, the heat transfer efficiency is different, the thermal expansion is inconsistent, the roller gap size is different, and the consistency of the transverse thickness of the pole piece decreases; According to the material size and the calculated value of thermal expansion characteristics, the program sets the temperature threshold of the bearing seat 202; the ball valve is adjusted to the opening of the four bearing seats 202 for the reflux, matching the cooling speed of each bearing seat 202, and the condensate flow is monitored through the flow switch 303; the temperature sensor 202d reads the temperature of the four bearing seats 202 online; the program instruction is triggered through the feedback of the equipment status and the temperature value of the bearing seat 202 to control the opening and closing of the fluid solenoid valve 304 at the condensate inlet; the heat dissipation speed of the bearing seat 202 is adjusted by the change of the condensate flow rate, balancing the work done by the roller surface and the heat generated by the rolling friction of the bearing; the temperature of the roller is stable to avoid the change of the roller gap due to thermal expansion and contraction; the thickness of the pole piece is confirmed according to the laser thickness gauge 4. When the work is completed, the speed is reduced before the shutdown, the heat generated by the equipment is reduced, the speed instruction set by the program is triggered, and the condensate inlet is closed to avoid the overcooling of the bearing seat 202 temperature and the sudden change of the roller temperature difference, maintain the size of the roller gap unchanged, and ensure the consistency of the pole piece thickness.
[0041] It is worth noting that this embodiment can also be combined with external program control. When the equipment is running, the roller works to increase the temperature. When the temperature reaches the temperature calibration value, the program control is triggered to open the condensate water inlet to stabilize the heat conduction efficiency according to the set temperature difference, thereby controlling the change in the roller gap size and ensuring the consistency of the longitudinal thickness of the pole piece.
[0042] According to the structural differences on both sides of the rolling roller, by adjusting the size of the opening value of the condensate return port, the flow rate of condensate on the upper and lower bearing seats 202 on the transmission side and the operating side is controlled respectively, and the thermal expansion of the transmission side and the operating side is balanced to achieve consistent temperature changes and roller gap changes, thereby ensuring the consistency of the lateral thickness of the pole piece.
[0043] Example 3
[0044] The present embodiment provides a pole piece rolling machine, which can roll-form pole pieces. The main body of the rolling machine includes a frame, and can also include a feeding device, a scraper device, and a conveying roller. The pole piece rolling device is arranged on the frame of the pole piece rolling machine. The feeding device conveys the raw material to the rolling channel between the first roller 201 and the second roller 202 in the pole piece rolling device for rolling. The scraper mechanism is arranged on one side of the first roller 201 and the second roller 202 to scrape the rolled pole piece from the first roller 201 and the second roller 202, and then the conveying roller conveys the pole piece to the next process.
[0045] The pole piece rolling device of the present embodiment is provided with a pole piece rolling device, which can cool down the first roller 201 and the second roller 202 during operation, so that the temperature remains constant during operation, and prevent the thermal expansion and contraction caused by excessive temperature from affecting the roller gap, so that the size of the roller gap remains consistent during operation, thereby ensuring that the thickness of the pole piece rolled out remains consistent in the horizontal and vertical directions, and realizing adaptive regulation of the roller temperature.
[0046] The drawings are only for illustrative purposes and cannot be construed as limiting the present invention. To better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as limiting the present invention.
[0047] The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc. indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it 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. Therefore, the terms describing the positional relationship in the drawings are only used for exemplary explanations and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.
[0048] In the description of this application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, the specific relationship represented can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, they can understand the specific meanings of the above terms in this application according to specific circumstances.
[0049] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.
Claims
1. A pole piece rolling device, characterized in that: include: Mounting frame; A roller assembly is mounted on the mounting frame, wherein the roller assembly comprises a first roller and a second roller, wherein the first roller is arranged opposite to the second roller; as well as A water cooling assembly is installed on one side of the mounting frame, the water cooling assembly is connected to the mounting frame, and a regulating valve for regulating liquid flow is provided on the water cooling assembly; The water cooling assembly is thermally connected to the roller assembly to maintain a stable temperature of the roller.
2. The pole piece rolling device according to claim 1, characterized in that: The rolling mill assembly also includes a bearing seat, which is respectively arranged at the end of the first rolling mill and the second rolling mill, and a pipeline is opened inside the bearing seat. A first water inlet and a first return port are provided on one side of the bearing seat, and the first water inlet and the first return port are connected through the pipeline.
3. The pole piece rolling device according to claim 2, characterized in that: A temperature sensor is also provided on the bearing seat.
4. The pole piece rolling device according to claim 2, characterized in that: The water cooling assembly includes a water cooling pipe, the water cooling is provided with a second water inlet and a second return port for communicating with an external pipeline, and the regulating valve is provided on one side of the second water inlet and the second return port; The water cooling pipe is also provided with a plurality of water outlets and a third reflux port, wherein the water outlets are connected to the first water inlet, and the third reflux port is connected to the first reflux port.
5. The pole piece rolling device according to claim 4, characterized in that: The water cooling pipe is provided with a flow switch for monitoring the liquid flow.
6. The pole piece rolling device according to claim 4, characterized in that: A fluid solenoid valve is provided on a side of the second water inlet close to the water cooling pipe.
7. The pole piece rolling device according to claim 1, characterized in that: A thickness gauge for detecting the thickness of the pole piece is also provided on one side of the roller assembly.
8. The pole piece rolling device according to claim 1, characterized in that: The roller assembly further comprises a first driving assembly, which is drivingly connected to the second roller so as to adjust the spacing between the second roller and the first roller.
9. The pole piece rolling device according to claim 1, characterized in that: The ends of the first roller and the second roller are both provided with a second driving assembly to drive the first roller and the second roller to rotate.
10. A pole piece roller press, characterized in that: It comprises a roller pressing machine body and a pole piece rolling device as described in any one of claims 1-9.