A wet lithium battery diaphragm constant temperature cooling device

Abstract

The utility model relates to lithium battery diaphragm preparation technical field, concretely relates to a kind of wet lithium battery diaphragm thermostatic cooling device, it includes multi-temperature section thermostat, heater, refrigerator, temperature controller and over roller, and multi-temperature section thermostat includes multiple intercommunication, temperature independent adjustment temperature regulating chamber, heater, refrigerator and temperature controller are equipped in each temperature regulating chamber. The upper end inner wall of temperature regulating chamber is equipped with heater for adjusting diaphragm sheet temperature, refrigerator, temperature controller is used to control the working temperature of heater, refrigerator according to the surface temperature of real-time acquisition diaphragm sheet, diaphragm sheet is sequentially passed through feed port, each temperature regulating chamber of temperature gradually reducing and discharge port under the driving of multiple over rollers. The purpose of the wet lithium battery diaphragm thermostatic cooling device is to solve the problem of uneven cooling after high-temperature sheet is cast into shape, which leads to diaphragm quality defects.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery separator preparation technology, specifically to a constant temperature cooling device for wet-process lithium battery separators. Background Technology

[0002] In wet-process diaphragm production, the cast sheets require rapid cooling to fix their microstructure. Traditional equipment relies on open-roll cooling or localized air cooling, which presents the following problems:

[0003] 1. Fluctuations in ambient temperature lead to unstable cooling rates, resulting in a large temperature difference between the surface and interior of the sheet, which generates internal stress.

[0004] 2. Uneven cooling causes fluctuations in separator thickness, affecting battery safety and consistency;

[0005] 3. Condensation is easily generated in high humidity environments, which can contaminate the membrane surface;

[0006] 4. During the cooling process of the cold roller, there are differences in crystallization and shrinkage between the surface in contact with the cold roller and the non-contact surface, which form film surface texture.

[0007] Therefore, the inventors have provided a constant temperature cooling device for wet-process lithium battery separators. Utility Model Content

[0008] (1) Technical problems to be solved

[0009] This utility model provides a constant temperature cooling device for wet-process lithium battery separators, which solves the technical problem of separator quality defects caused by uneven cooling after high-temperature sheet casting.

[0010] (2) Technical solution

[0011] This utility model provides a constant temperature cooling device for wet-process lithium battery separators, including a multi-temperature-segment constant temperature chamber, a heater, a cooler, a temperature controller, and a roller. The multi-temperature-segment constant temperature chamber has an inlet port and an outlet port. The multi-temperature-segment constant temperature chamber includes multiple interconnected temperature-regulating chambers with independently adjustable temperatures. Each temperature-regulating chamber is equipped with the heater, the cooler, and the temperature controller.

[0012] The upper and lower inner walls of the temperature regulating chamber are equipped with heaters and coolers for regulating the temperature of the diaphragm sheet. The temperature controller is used to control the operating temperature of the heaters and coolers according to the real-time surface temperature of the diaphragm sheet. The diaphragm sheet passes sequentially through the feed port, each temperature regulating chamber with progressively decreasing temperature, and the discharge port under the drive of multiple rollers.

[0013] Furthermore, the wet-process lithium battery separator constant temperature cooling device also includes a flow equalization plate and a fan. Each of the temperature regulating chambers is provided with the flow equalization plate and the fan at its upper and lower ends. The flow equalization plate covers the heater, the cooler and the fan. The fan cooperates with the flow equalization plate to form a laminar airflow.

[0014] Furthermore, the wet-process lithium battery separator constant temperature cooling device also includes a fan controller, each of which is connected to the corresponding fan electrical control and is used to control the speed of the fan.

[0015] Furthermore, the wet-process lithium battery separator constant temperature cooling device also includes a dehumidification module, and multiple dehumidification modules are used to control the humidity of the corresponding temperature regulating chamber.

[0016] Furthermore, the heater is a resistance wire.

[0017] Furthermore, the cooler is a semiconductor refrigeration chip.

[0018] Furthermore, the size of the connection between two adjacent temperature-regulating chambers is adapted to the cross-sectional size of the diaphragm sheet.

[0019] Furthermore, the two adjacent temperature-regulating chambers are magnetically connected.

[0020] Furthermore, the multi-temperature-segment constant temperature chamber is a closed structure made of heat-insulating material.

[0021] Furthermore, the multi-temperature-segment constant temperature chamber is made of ceramic fiber.

[0022] (3) Beneficial effects

[0023] In summary, this utility model uses independent temperature control in multiple sections to cool the diaphragm sheet at a constant temperature, so that the diaphragm sheet is cooled uniformly in a constant temperature environment with the temperature difference controlled within ±1℃. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of a wet-process lithium battery separator constant temperature cooling device provided in an embodiment of this utility model.

[0026] In the picture:

[0027] 1-Multi-temperature range constant temperature chamber; 101-Infeed port; 102-Outfeed port; 2-Heater; 3-Refrigerator; 4-Temperature controller; 5-Roller; 6-Flow equalization plate; 7-Fan; 8-Fan controller; 9-Dehumidification module; 100-Diaphragm sheet; 200-Die head. Detailed Implementation

[0028] The embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to exemplarily illustrate the principle of this utility model, but should not be used to limit the scope of this utility model. That is, this utility model is not limited to the described embodiments, and covers any modifications, substitutions and improvements to the parts, components and connection methods without departing from the spirit of this utility model.

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "install" 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 direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] Figure 1 This is a schematic diagram of a constant-temperature cooling device for a wet-process lithium battery separator provided in an embodiment of this utility model. (See attached diagram.) Figure 1The device may include a multi-temperature-segment constant temperature chamber 1, a heater 2, a cooler 3, a temperature controller 4, and rollers 5. The multi-temperature-segment constant temperature chamber 1 has a feed port 101 and a discharge port 102. The multi-temperature-segment constant temperature chamber 1 includes multiple interconnected temperature regulating chambers with independently adjustable temperatures. Each temperature regulating chamber is equipped with a heater 2, a cooler 3, and a temperature controller 4. The upper and lower inner walls of the temperature regulating chambers are equipped with heaters 2 and coolers 3 for adjusting the temperature of the diaphragm sheet 100. The temperature controller 4 controls the operating temperature of the heaters 2 and coolers 3 based on the real-time surface temperature of the diaphragm sheet 100. The diaphragm sheet 100 passes sequentially through the feed port 101, each temperature regulating chamber with progressively decreasing temperature, and the discharge port 102 under the drive of the multiple rollers 5.

[0033] In the above embodiment, the temperature controller 4 has an infrared sensor that can monitor the surface temperature of the diaphragm sheet 100 in real time and feed it back to the PLC (Programmable Logic Controller), thereby regulating the operating temperature of the heater 2 and the cooler 3 to ensure that the internal temperature of each temperature regulating chamber remains constant. It should be noted that since the temperature controller 4 is a conventional device in the art, its specific structure and working principle will not be described in detail.

[0034] Among them, the multi-temperature constant temperature chamber 1 is a closed structure made of heat-insulating material. The material of the multi-temperature constant temperature chamber 1 is ceramic fiber, the heater 2 is a resistance wire, and the cooler 3 is a semiconductor cooling chip.

[0035] As an optional implementation method, such as Figure 1 As shown, the wet-process lithium battery separator constant temperature cooling device also includes a flow equalization plate 6 and a fan 7. Each temperature regulating chamber has a flow equalization plate 6 and a fan 7 at its upper and lower ends. The flow equalization plate 6 covers the heater 2, the cooler 3, and the fan 7. The fan 7 works in conjunction with the flow equalization plate 6 to form laminar airflow. The fan 7 can be a centrifugal fan, with a wind speed generally controlled between 0.5 and 2 m / s. The fan 7 works in conjunction with the flow equalization plate 6 to form directional airflow circulation. The horizontal flow direction of the airflow (from the low-temperature zone to the high-temperature zone) is as follows: Figure 1 As shown in the middle → direction, the cooling problem of the diaphragm sheet 100 extruded from the die 200 is solved by the coordinated control of airflow velocity (fan 7) and temperature (heater 2, cooler 3). The diaphragm thickness fluctuation after treatment by this constant temperature cooling device is reduced from ±1.5μm to ±0.5μm, and the yield is improved by more than 12%; internal stress cracking is eliminated, the tensile strength uniformity is improved by 25%, and the energy consumption is reduced by 40% compared with the traditional water cooling device.

[0036] As an optional implementation method, such as Figure 1As shown, the wet-process lithium battery separator constant temperature cooling device also includes a fan controller 8. Each fan controller 8 is electrically connected to the corresponding fan 7 and is used to control the speed of the fan 7. It should be noted that since the fan controller 8 is a conventional device in this field, its specific structure and working principle will not be described in detail.

[0037] As an optional implementation method, such as Figure 1 As shown, the wet-process lithium battery separator constant temperature cooling device also includes dehumidification modules 9. Multiple dehumidification modules 9 are used to control the humidity of corresponding temperature-controlled chambers to maintain the dew point temperature inside the temperature-controlled chamber slightly lower than the external ambient temperature, preventing frost formation on the surface of the separator sheet 100 after it exits the multi-temperature-segment constant temperature chamber 1 due to excessive temperature difference between the inside and outside. It should be noted that since the dehumidification module is a conventional device in this field, its specific structure and working principle will not be described in detail.

[0038] As an optional implementation, the size of the connection between two adjacent temperature-controlled chambers is adapted to the cross-sectional dimensions of the diaphragm sheet 100. The two adjacent temperature-controlled chambers are magnetically connected. Specifically, the modular design of the temperature-controlled chambers does not limit the specific number of chambers, allowing the length of the combined multi-temperature-segment constant temperature chamber 1 to be freely customized according to the production line (length from 2 to 8 meters), and the temperature range to be adjusted from -10°C to 50°C to accommodate different production capacity requirements.

[0039] It should be clarified that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. This utility model is not limited to the specific steps and structures described above and shown in the figures. Furthermore, for the sake of brevity, detailed descriptions of known methods and techniques are omitted here.

[0040] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art without departing from the scope of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A constant-temperature cooling device for a wet-process lithium battery separator, characterized in that, The system includes a multi-temperature-segment constant temperature chamber (1), a heater (2), a cooler (3), a temperature controller (4), and a roller (5). The multi-temperature-segment constant temperature chamber (1) has a feed port (101) and a discharge port (102). The multi-temperature-segment constant temperature chamber (1) includes multiple interconnected temperature control chambers with independently adjustable temperatures. Each temperature control chamber is equipped with the heater (2), the cooler (3), and the temperature controller (4). The upper and lower inner walls of the temperature regulating chamber are provided with heaters (2) and coolers (3) for regulating the temperature of the diaphragm sheet (100). The temperature controller (4) is used to control the working temperature of the heaters (2) and coolers (3) according to the real-time surface temperature of the diaphragm sheet (100). The diaphragm sheet (100) passes through the feed port (101), each temperature regulating chamber with gradually decreasing temperature, and the discharge port (102) in sequence under the drive of multiple rollers (5).

2. The wet-process lithium battery separator constant temperature cooling device according to claim 1, characterized in that, It also includes a flow equalization plate (6) and a fan (7). Each temperature regulating chamber is provided with the flow equalization plate (6) and the fan (7) at its upper and lower ends. The flow equalization plate (6) covers the heater (2), the refrigerator (3) and the fan (7). The fan (7) cooperates with the flow equalization plate (6) to form a laminar airflow.

3. The wet-process lithium battery separator constant temperature cooling device according to claim 2, characterized in that, It also includes a fan controller (8), each of the fan controllers (8) being electrically connected to the corresponding fan (7) and used to control the speed of the fan (7).

4. The wet-process lithium battery separator constant temperature cooling device according to claim 1, characterized in that, It also includes a dehumidification module (9), and multiple dehumidification modules (9) are used to control the humidity of the corresponding temperature-controlled chamber.

5. The wet-process lithium battery separator constant temperature cooling device according to claim 1, characterized in that, The heater (2) is a resistance wire.

6. The wet-process lithium battery separator constant temperature cooling device according to claim 1, characterized in that, The cooler (3) is a semiconductor cooling chip.

7. The wet-process lithium battery separator constant temperature cooling device according to claim 1, characterized in that, The size of the connection between two adjacent temperature-regulating chambers is adapted to the cross-sectional size of the diaphragm sheet (100).

8. The constant temperature cooling device for wet-process lithium battery separators according to claim 1, characterized in that, The two adjacent temperature control chambers are magnetically connected.

9. The wet-process lithium battery separator constant temperature cooling device according to claim 1, characterized in that, The multi-temperature constant temperature chamber (1) is a closed structure made of heat-insulating material.

10. The constant temperature cooling device for wet-process lithium battery separators according to claim 1, characterized in that, The multi-temperature constant temperature chamber (1) is made of ceramic fiber.

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