Pressure roller device

Abstract

This utility model discloses a pressure roller device, comprising: a roller having a receiving cavity and an installation channel, the receiving cavity for containing heat-conducting liquid, and the installation channel being disposed through the inside of the roller and extending along the axial direction of the roller; and a coolant conveying pipe extending along the axial direction of the roller and disposed within the installation channel, with the coolant conveying pipe being rotatably arranged relative to the roller. By adopting the above technical solution, the pressure roller device provided by this utility model, through the setting of a receiving cavity filled with heat-conducting liquid inside the roller and the introduction of an independent coolant conveying pipe, and the relative rotatable arrangement of the roller and the coolant conveying pipe, is beneficial to improving the uniformity of heat exchange, increasing cooling efficiency, and ensuring the stable quality of processed products.

Description

Technical Field

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

[0002] In the manufacturing process of lithium-ion batteries, the compaction density of the electrode sheets is one of the key parameters affecting the battery's energy density, rate performance, and cycle life. To improve the compaction density of the electrode sheets, the industry commonly uses a hot-pressing process, which involves rolling the coated electrode sheets using heated rollers. This process typically utilizes high-temperature heat-conducting oil circulating inside the main roller cavity to heat the roller surface, allowing the rollers to operate at a stable high temperature. By leveraging the plastic deformation characteristics of the material under heating, a higher compaction effect can be achieved under relatively low pressure. This also helps reduce electrode rebound and improves the interfacial contact between the electrode sheet and the current collector.

[0003] However, the current hot pressing process suffers from a significant technical bottleneck: the large thermal inertia of the main roller during heating and cooling results in a slow temperature control response. Specifically, when the process requires cooling from a higher operating temperature to a lower temperature (e.g., from 120°C to 50°C), the cooling process often takes several hours due to the large size and high heat capacity of the main roller, and the reliance on natural cooling or inefficient forced cooling methods. This slow cooling characteristic poses a serious challenge to process development and experimental verification. When systematically studying the effects of different temperature parameters on the electrode microstructure (e.g., porosity, binder distribution), mechanical properties (e.g., flexibility, cohesion), and electrochemical properties, the long cooling time severely restricts experimental efficiency, significantly extends the development cycle, and increases time and cost investment, becoming a major obstacle to optimizing the hot pressing process and achieving rapid process verification. Utility Model Content

[0004] This invention proposes a pressure roller device to solve the above-mentioned problems.

[0005] In a first aspect, embodiments of the present invention provide a pressure roller device, comprising:

[0006] The roller has a receiving cavity and an installation channel. The receiving cavity is used to contain heat transfer fluid, and the installation channel is disposed through the inside of the roller and extends along the axial direction of the roller.

[0007] A coolant delivery pipe is provided in the installation channel, extending along the axial direction of the roller, and is arranged to rotate relative to the roller.

[0008] By adopting the above technical solution, the pressure roller device provided by this utility model provides a cavity inside the roller filled with heat-conducting liquid and introduces an independent coolant delivery pipe. The roller and the coolant delivery pipe are arranged to rotate relative to each other, which helps to improve the uniformity of heat exchange, improve cooling efficiency, and ensure the stable quality of processed products.

[0009] According to another embodiment of the present invention, it further includes: two bearings, respectively located at both ends of the roller in the axial direction, the bearings having an inner bearing ring and an outer bearing ring, the inner bearing ring being fixed to the end of the coolant delivery pipe, and the outer bearing ring being at least partially fixed to the roller; and two supports, respectively fixed to both ends of the coolant delivery pipe.

[0010] According to another embodiment of the present invention, it further includes: an adapter shaft, which is fixed through the inner ring of the bearing and communicates with the coolant delivery pipe; and a connector, which is fixedly connected to the end of the coolant delivery pipe and the end of the adapter shaft.

[0011] According to another embodiment of the present invention, the connecting component is a connecting flange, and the end of the coolant delivery pipe and the end of the adapter shaft are detachably connected through the connecting flange.

[0012] According to another embodiment of the present invention, it further includes: a drive mechanism connected to the roller or the outer ring of the bearing for driving the roller to rotate relative to the coolant delivery pipe.

[0013] According to another embodiment of the present invention, it further includes: an inlet valve, disposed at the inlet end of the coolant delivery pipe, the inlet valve being used to adjust the inlet flow rate of the coolant delivery pipe.

[0014] According to another embodiment of the present invention, it further includes: a liquid outlet valve, which is disposed at the liquid outlet end of the coolant delivery pipe, and the liquid outlet valve is used to adjust the outlet flow rate of the coolant delivery pipe.

[0015] According to another embodiment of the present invention, it further includes: a coolant supply mechanism, the outlet of which is connected to the inlet of the coolant delivery pipe, the coolant supply mechanism being used to provide coolant. Attached Figure Description

[0016] Figure 1 This diagram shows a three-dimensional structural schematic of the pressure roller device in an embodiment of the present invention.

[0017] Figure 2 This diagram shows a three-dimensional structural schematic of the pressure roller device in another embodiment of the present invention;

[0018] Figure 3 This diagram shows the positions of the inlet valve and outlet valve in an embodiment of the present invention.

[0019] Figure label:

[0020] Roller 1; Coolant delivery pipe 2; Bearing 3; Inner ring of bearing 31; Outer ring of bearing 32; Support 4; Adapter shaft 5; Connector 6; Inlet valve 7; Outlet valve 8. Detailed Implementation

[0021] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0022] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0026] Firstly, reference Figure 1This utility model provides a pressure roller device, including: a roller 1 and a coolant conveying pipe 2. The roller 1 has a receiving cavity and an installation channel. The receiving cavity is used to receive heat transfer fluid. The installation channel is disposed inside the roller 1 and extends along the axial direction of the roller 1. The coolant conveying pipe 2 is disposed in the installation channel and extends along the axial direction of the roller 1. The coolant conveying pipe 2 is rotatably disposed relative to the roller 1.

[0027] In this embodiment, the pressure roller device provided by this utility model has a cavity inside the roller 1 filled with heat-conducting liquid, and an independent coolant delivery pipe 2 is introduced. The roller 1 and the coolant delivery pipe 2 are arranged to rotate relative to each other, which helps to improve the uniformity of heat exchange, improve cooling efficiency, and ensure the stable quality of processed products (preventing uneven product thickness or surface defects caused by uneven roller temperature). Specifically, this solution achieves active and forced cooling by introducing a built-in coolant delivery pipe 2. When cooling is required, the coolant (such as cold water) flows inside the pipe, directly and efficiently absorbing the heat from the high-temperature heat-conducting liquid inside the roller through the pipe wall, and quickly carrying the heat out of the roller 1. This can shorten the cooling time from several hours to tens of minutes or even less, greatly improving R&D efficiency. Furthermore, the coolant delivery pipe 2 runs through the entire axis of the roller 1, which is equivalent to inserting a "cooling rod" at the center of the heat source. Heat is transferred from the high-temperature roller wall and heat transfer fluid to the low-temperature coolant delivery pipe 2, forming a stable radial temperature gradient. The heat exchange path is short and uniform, avoiding the phenomenon of high temperature in the middle and low temperature at both ends caused by cooling only from both ends of roller 1. This ensures the uniformity of roller surface temperature, thereby guaranteeing the consistency of electrode compaction density and thickness, and improving product yield.

[0028] In this embodiment, the structure of roller 1 other than the mounting channel can be regarded as a receiving cavity. The space of the mounting channel and the receiving cavity are independent of each other to prevent the heat transfer fluid from entering the mounting channel.

[0029] In the above embodiment, it further includes: two bearings 3 and two supports 4. The two bearings 3 are respectively located at both ends of the roller 1 in the axial direction. The bearing 3 has an inner bearing ring 31 and an outer bearing ring 32. The inner bearing ring 31 is fixed to the end of the coolant conveying pipe 2, and the outer bearing ring 32 is at least partially fixed to the roller 1. The two supports 4 are respectively fixed to both ends of the coolant conveying pipe 2.

[0030] In this embodiment, the bearing 3 is the key mechanical structure that enables the roller 1 to rotate while the coolant delivery pipe 2 remains fixed. The outer ring 32 of the bearing rotates with the roller 1, and the inner ring 31 of the bearing is connected to the fixed coolant delivery pipe 2, achieving relative movement with low frictional resistance. This ensures the smooth rotation of the roller 1 and provides solid support for the fixed coolant delivery pipe 2, keeping it stationary and stable inside the high-speed rotating roller 1 and preventing wear and leakage caused by vibration or eccentric force.

[0031] In the above embodiment, the pressure roller device further includes: an adapter shaft 5 and a connector 6. The adapter shaft 5 is fixed through and connected to the inner ring 31 of the bearing and communicates with the coolant delivery pipe 2. The connector 6 is fixedly connected to the end of the coolant delivery pipe 2 and the end of the adapter shaft 5. Specifically, the connector 6 is a connecting flange, and the end of the coolant delivery pipe 2 and the end of the adapter shaft 5 are detachably connected through the connecting flange. In this embodiment, the detachable connecting flange allows for maintenance or replacement of the coolant delivery pipe 2 without damaging the entire roller 1, greatly reducing maintenance complexity, time, and cost. Specifically, the connector 6 includes a first flange fixed to the coolant delivery pipe 2 and a second flange fixed to the end of the adapter shaft 5. The first flange and the second flange are connected and fixed by bolts and nuts. In some embodiments, to ensure the sealing between the adapter shaft 5 and the coolant delivery pipe 2, a sealing gasket can also be provided between the end of the coolant delivery pipe 2 and the end of the adapter shaft 5. It should be noted that the installation of the sealing gasket should not affect the delivery of coolant in the coolant delivery pipe 2.

[0032] exist Figure 1 In the illustrated embodiment, the length of the coolant delivery pipe 2 is less than the length of the mounting channel, such that the connector 6 is located inside the mounting channel. Technicians can adjust the diameter of the mounting channel as needed to facilitate the assembly of the pressure roller assembly. In some embodiments, such as Figure 2 As shown, in order to facilitate the assembly between the coolant delivery pipe 2 and the adapter shaft 5, the length of the coolant delivery pipe 2 is greater than the axial length of the roller 1, so that the installation and disassembly between the coolant delivery pipe 2 and the adapter shaft 5 can be realized outside the installation channel.

[0033] In the above embodiment, while ensuring that the bearing outer ring 32 and the roller 1 can rotate synchronously, the bearing outer ring 32 and the roller 1 can be fixedly connected in a way that facilitates installation and disassembly. For example, a sealing ring can be added to the annular space between the bearing outer ring and the roller 1, and the bearing outer ring 32 can be fixed to the mounting channel by relying on the friction between the sealing ring and the bearing outer ring 32 and the mounting channel. Technicians can achieve a relatively fixed connection between the bearing outer ring 32 and the roller 1 in other ways, and this embodiment does not limit this.

[0034] In the above embodiment, the pressure roller device further includes a drive mechanism (not shown in the figure), which is connected to the roller 1 or the outer ring 32 of the bearing to drive the roller 1 to rotate relative to the coolant delivery pipe 2. The drive mechanism is the power source for the roller 1 as a "pressure roller", ensuring that it can rotate at a set speed to complete the continuous rolling of the electrode sheet.

[0035] In the above embodiments, such as Figure 3As shown, the pressure roller device also includes: an inlet valve 7, an outlet valve 8, and a coolant supply mechanism (not shown in the figure). The inlet valve 7 is located at the inlet end of the coolant delivery pipe 2 and is used to adjust the inlet flow rate of the coolant delivery pipe 2. The outlet valve 8 is located at the outlet end of the coolant delivery pipe 2 and is used to adjust the outlet flow rate of the coolant delivery pipe 2. The outlet of the coolant supply mechanism is connected to the inlet of the coolant delivery pipe 2 and is used to supply coolant.

[0036] In this embodiment, the flow rate and supply of coolant are precisely controlled through the inlet valve 7, the outlet valve 8, and the coolant supply mechanism, thereby achieving rapid, linear, and programmable temperature reduction control of the roller 1. The coolant supply mechanism can supply cooling water or other coolants; this embodiment is not limited to this.

[0037] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A pressure roller device, characterized in that, include: A roller having a receiving cavity and an installation channel, the receiving cavity being used to receive a heat transfer fluid, and the installation channel being disposed through the interior of the roller and extending along the axial direction of the roller; A coolant delivery pipe is provided in the mounting channel, extending along the axial direction of the roller, and the coolant delivery pipe is rotatably arranged relative to the roller.

2. The pressure roller device according to claim 1, characterized in that, Also includes: Two bearings are located at opposite ends of the roller in the axial direction. Each bearing has an inner ring and an outer ring. The inner ring is fixed to the end of the coolant delivery pipe, and the outer ring is at least partially fixed to the roller. Two brackets are fixed to both ends of the coolant delivery pipe, respectively.

3. The pressure roller device according to claim 2, characterized in that, Also includes: The adapter shaft passes through and is fixed to the inner ring of the bearing and is connected to the coolant delivery pipe; A connector that securely connects the end of the coolant delivery pipe to the end of the adapter shaft.

4. The pressure roller device according to claim 3, characterized in that, The connector is a connecting flange, and the end of the coolant delivery pipe is detachably connected to the end of the adapter shaft through the connecting flange.

5. The pressure roller device according to any one of claims 2 to 4, characterized in that, Also includes: A drive mechanism, connected to the roller or the outer ring of the bearing, is used to drive the roller to rotate relative to the coolant delivery pipe.

6. The pressure roller device according to claim 1, characterized in that, Also includes: An inlet valve is located at the inlet end of the coolant delivery pipe, and the inlet valve is used to adjust the inlet flow rate of the coolant delivery pipe.

7. The pressure roller device according to claim 1, characterized in that, Also includes: An outlet valve is located at the outlet end of the coolant delivery pipe, and the outlet valve is used to adjust the outlet flow rate of the coolant delivery pipe.

8. The pressure roller device according to claim 1, characterized in that, Also includes: The coolant supply mechanism has its outlet connected to the inlet of the coolant delivery pipe, and the coolant supply mechanism is used to supply coolant.

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