Diaphragm thickness adjusting device and diaphragm

Abstract

The utility model provides a diaphragm thickness adjusting device and a diaphragm. The diaphragm thickness adjusting device comprises an unwinding device arranged in the advancing direction of the diaphragm; the transmission device comprises a rolling shaft, and the rolling shaft rotates to drive the diaphragm to move; the heating device comprises a box body, the box body is provided with a material inlet and a material outlet which are used for a diaphragm to enter and exit, a heating part is arranged in the box body, and the heating part comprises a channel for a heating medium to flow; the compression roller device comprises a first compression roller and a second compression roller which are arranged on the two sides of the advancing direction of the diaphragm, and the distance between the first compression roller and the second compression roller is adjustable so as to adjust the thickness of the diaphragm. The diaphragm thickness adjusting device is simple in structure, diaphragm thickness fluctuation can be reduced, diaphragm thickness consistency is guaranteed, the tab dislocation degree is reduced, and the reject ratio and the manufacturing cost are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium - ion batteries, in particular to a diaphragm thickness adjusting device and a diaphragm. Background Art

[0002] At present, the production of square aluminum cases mainly adopts the winding process. Due to the large number of tab layers, there is a situation of tab misalignment after winding, which affects the subsequent welding effect. In serious cases, there is a risk of short - circuit and fire. There are many influencing factors for tab misalignment. As one of the influencing factors, the diaphragm thickness has a great influence on the alignment of tabs. The greater the fluctuation of the diaphragm thickness, the greater the influence on the tab offset. The existing diaphragm thickness adjusting devices basically set the pressure roller device and the heating device together, with a complex structure. Summary of the Utility Model

[0003] In order to overcome the defects in the prior art, the embodiments of the utility model provide a diaphragm thickness adjusting device and a diaphragm, which have a simple structure, can reduce the fluctuation of the diaphragm thickness, ensure the consistency of the diaphragm thickness, reduce the degree of tab misalignment, and reduce the defective rate and manufacturing cost.

[0004] To achieve the above - mentioned purpose, the technical solution adopted by the utility model is as follows:

[0005] In the first aspect of the utility model, a diaphragm thickness adjusting device is disclosed, including: arranged along the advancing direction of the diaphragm,

[0006] A unwinding device;

[0007] A transmission device, including a roller, and the roller drives the diaphragm to move through rotation;

[0008] A heating device, including a box body, the box body is provided with a feeding port and a discharging port for the diaphragm to enter and exit, and a heating part is arranged inside the box body, and the heating part includes a channel for the heating medium to flow;

[0009] A pressure roller device, including a first pressure roller and a second pressure roller arranged on both sides of the advancing direction of the diaphragm, and the distance between the first pressure roller and the second pressure roller is adjustable to adjust the diaphragm thickness.

[0010] The above - mentioned technical solution squeezes the diaphragm through the pressure roller device with adjustable distance, adjusts the thickness of the diaphragm, reduces the thickness fluctuation of the diaphragm, improves the alignment of the winding tabs, can adjust different types of diaphragms, has high compatibility, and has a simple structure, can operate independently, or can be integrated into the winding machine equipment.

[0011] Furthermore, the box body is provided with an inlet and an outlet for the heating medium to enter and exit the channel, and the inlet and the outlet are connected to the heating part and the outside of the box body. The inlet, the channel and the outlet are interconnected, and the heating medium enters from the inlet, fills the channel and then flows out from the outlet.

[0012] Further, the inlet is connected to a first pipeline, and the outlet is connected to a second pipeline. The inlet is for the inflow of the heating medium, and the outlet is for the outflow of the heating medium. The structure and operation of the provided heating device are simple, which is used to provide heat to the diaphragm to soften the glue coating layer on the surface of the diaphragm. After softening, the diaphragm can be more simply adjusted in thickness through the roller device.

[0013] Further, the heating medium includes at least one of heat-conducting oil, steam, or water. The vapor-liquid heating medium enters from the first pipeline, fills the heating area, and then flows out from the second pipeline, realizing circulating heating in the heating device. The diaphragm is uniformly heated, and the heat transfer efficiency is high, which can improve the diaphragm adjustment efficiency.

[0014] Further, the heating temperature of the heating device is 60°C to 70°C. When the heating temperature is set within this range, it can provide heat to the diaphragm to soften the glue coating layer on the surface of the diaphragm.

[0015] Further, the inlet and the outlet are arranged on opposite sides of the box body, and the feeding port and the discharging port are arranged on opposite sides of the box body. The arrangement of the inlet and the outlet on opposite sides facilitates the entry and outflow of the heating medium. The feeding port and the discharging port are for the diaphragm to pass through the heating device. When arranged on opposite sides, the diaphragm is more uniformly heated.

[0016] Further, the unwinding device, the transmission device, and the second roller are at the same height as the inlet and the outlet of the heating device.

[0017] Further, the roller device includes an adjusting bearing and a fixed bearing. The adjusting bearing is arranged above the fixed bearing. The first roller is connected to the adjusting bearing, and the second roller is connected to the fixed bearing. The distance between the first roller and the second roller can be changed by adjusting the bearing.

[0018] Further, the first roller is connected to a pressurizing device, and the pressurizing device is arranged above the first roller. By applying pressure to the first roller through the pressurizing device, the roll gap and pressure are adjusted to realize the adjustment of the diaphragm thickness, and the structure is simple.

[0019] In the second aspect of the present utility model, a diaphragm is disclosed, and the diaphragm is prepared by any one of the diaphragm thickness adjusting devices disclosed in the first aspect.

[0020] Due to the application of the above technical solutions, the present utility model has the following advantages compared with the prior art:

[0021] 1. By adjusting the roll gap and pressure of the roller device, the present application can adjust the diaphragm thickness, reduce the diaphragm thickness fluctuation, improve the diaphragm thickness consistency, improve the alignment degree of the wound tabs, and improve the production yield.

[0022] 2. The heating device provided in this application has an inlet, a channel, and an outlet that are interconnected. The heating medium enters from the inlet, fills the channel, and then flows out from the outlet. The heating medium circulates and heats inside the heating device, enabling the diaphragm to be evenly heated with high heat transfer efficiency, which can improve the diaphragm adjustment efficiency.

[0023] 3. The structure of the diaphragm thickness adjustment device in this application is simple. It can be independent or integrated into the winding machine equipment. The heating device can choose whether to heat according to the properties of the diaphragm, and can perform different treatments on different diaphragms, with high compatibility and adaptability to all current types of diaphragms.

[0024] To make the above and other purposes, features, and advantages of the present utility model more obvious and understandable, the following provides preferred embodiments in conjunction with the accompanying drawings and detailed descriptions are as follows. Description of the Drawings

[0025] To more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following briefly introduces the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a schematic cross-sectional structure diagram of a diaphragm thickness adjustment device provided by an embodiment of this application;

[0027] Figure 2 It is a schematic three-dimensional structure diagram of a diaphragm thickness adjustment device provided by an embodiment of this application.

[0028] The reference numerals of the above drawings: 1. Unwinding device; 2. Transmission device; 3. Box body; 4. Heating part; 5. Channel; 6. First pipeline; 7. Second pipeline; 8. Feeding port; 9. Discharging port; 10. First pressing roller; 11. Second pressing roller; 12. Adjusting bearing; 13. Fixed bearing; 14. Pressurizing device; 15. Diaphragm. Detailed Embodiments

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Additionally, the accompanying drawings of the present utility model are only for simple schematic illustration and are not drawn according to actual dimensions, hereby stating in advance.

[0030] In the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "outer", "forward", "backward", "between", "close to", "far from", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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, it should not be construed as a limitation to the present utility model. It should also be noted that unless otherwise clearly specified and defined, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] It should be understood that although terms such as "first", "second", "third", etc. may be used in this article to describe various components or signals, these components or signals should not be limited by these terms. These terms are mainly used to distinguish one component from another, or one signal from another. In addition, the term "or" used in this article should, depending on the actual situation, possibly include any one or a combination of more of the associated listed items.

[0032] Referring to Figures 1 to 2 , an embodiment of the present application provides a diaphragm thickness adjusting device, including: an unwinding device, a transmission device, a heating device, and a pressure roller device arranged along the advancing direction of the diaphragm 15. The unwinding device is used for feeding the diaphragm 15, the transmission device is used for providing power for the advancement of the diaphragm 15, the heating device is used for providing heat to the diaphragm 15 to soften the glue layer on the surface of the diaphragm 15. During use, the heating device selects whether to heat the diaphragm 15 according to the actual situation, and the pressure roller device is used for adjusting the thickness of the diaphragm 15.

[0033] By means of the above device, the diaphragm thickness adjusting device in the embodiment of the present application can adjust the diaphragm thickness, reduce the diaphragm thickness fluctuation, improve the diaphragm thickness consistency, improve the alignment degree of the wound tabs, improve the yield rate. The provided diaphragm thickness adjusting device is simple, can be independent, or can be integrated into the winding machine equipment, can perform different treatments on different diaphragms, has high compatibility, and is suitable for all current types of diaphragms.

[0034] Specifically, referring to Figure 1 , the unwinding device 1 and the transmission device 2 are arranged in sequence according to the transmission direction of the diaphragm 15. The unwinding device 1 is used for feeding and unwinding the diaphragm 15, and the transmission device 2 is used for supporting the diaphragm 15 and providing transmission power during the winding process. The transmission device 2 includes a roller, and the roller drives the diaphragm 15 to move by rotation.

[0035] In a possible embodiment, when the incoming diaphragm 15 is installed on the unwinding device 1, it can be fixed by an air shaft, and the diaphragm 15 enters the heating device through the transmission device 2.

[0036] The heating device includes a box body 3. The box body 3 is provided with a material inlet 8 and a material outlet 9 for the diaphragm 15 to enter and exit. A heating part 4 is arranged inside the box body 3. The heating part 4 includes a channel 5 for the heating medium to flow.

[0037] In a possible embodiment, the box body 3 is provided with an inlet and an outlet for the heating medium to enter and exit, and the inlet and the outlet communicate the heating part 4 with the outside of the box body 3.

[0038] In a possible embodiment, the material inlet 8 and the material outlet 9 are arranged on opposite sides of the box body 3. At this time, the unwinding device is arranged on one side of the material inlet 8 of the heating device, and the pressure roller device is arranged on one side of the material outlet 9 of the heating device.

[0039] Among them, the box body 3 can be set into any structure. In a possible embodiment, the box body 3 is set as a cube. The heating part 4 is provided with a shell, and the shell divides the interior of the heating part 4 into two hollow areas. One of the hollow areas forms a channel 5 with the box body 3, and the other hollow area is for the diaphragm 15 to move. At least the shell of the heating part 4 on the box body 3 is made of a heat-conducting material, so that when the heating medium flows in the channel 5, the heat-conducting material conducts heat, and then through air heat transfer, the temperature inside the heating part 4 rises, so that the glue layer on the surface of the diaphragm 15 is heated and softened at high temperature.

[0040] In a possible embodiment, the inlet and the outlet are arranged on opposite sides of the box body 3, and the channel 5 is arranged on the peripheral side of the shell of the heating part 4. The inlet, the channel 5 and the outlet are interconnected. When heating, the heating medium enters from the inlet, circulates around the heating part 4 in the channel 5 for one week, and flows out from the outlet, so that the inside of the heating part 4 can be heated to achieve circulating heating. The diaphragm 15 is evenly heated, the heat transfer efficiency is high, and the adjustment efficiency of the diaphragm 15 can be improved.

[0041] In a possible embodiment, the inlet is connected with a first pipeline 6, and the outlet is connected with a second pipeline 7. The first pipeline 6 is used to communicate with a device for transporting the heating medium outside the box body 3, and the second pipeline 7 is used to communicate with a device for receiving the flowing-out heating medium outside the box body 3. Through the first pipeline 6 and the second pipeline 7, it is more convenient for the heating medium to enter and exit.

[0042] The heating medium in the embodiment of the present application can be a liquid or a gas to realize the circulating flow of the heating medium in the channel 5 and achieve circulating heating. The heating medium can be at least one of heat-conducting oil, steam or water. When heating, the heating temperature can reach 60°C to 70°C.

[0043] In a possible embodiment, the heating medium can be pressurized from outside the box body 3 through a pump body, so that the heating medium enters from the first pipeline 6, fills the channel 5 and then flows out from the second pipeline 7. The heating medium can circulate in the channel 5 to realize the circulating heating of the heating part 4, so that the diaphragm 15 is uniformly heated when passing through the heating device.

[0044] As Figure 1 and Figure 2 shown, the press roller device includes a first press roller 10 and a second press roller 11. The first press roller 10 and the second press roller 11 are arranged on both sides of the advancing direction of the diaphragm 15. The distance between the first press roller 10 and the second press roller 11 is adjustable to adjust the diaphragm thickness.

[0045] Specifically, as Figure 2 shown, in a possible embodiment, the press roller device includes an adjusting bearing 12 and a fixed bearing 13. The adjusting bearing 12 is arranged above the fixed bearing 13. The first press roller 10 is connected to the adjusting bearing 12, and the second press roller 11 is connected to the fixed bearing 13. The fixed bearing 13 fixes the second press roller 11 to make the second press roller 11 immovable. The adjusting bearing 12 can adjust the distance up and down to move the first press roller 10, so as to adjust the distance between the first press roller 10 and the second press roller 11 to adjust the thickness of the diaphragm 15. The distance between the first press roller 10 and the second press roller 11 is set according to the actual situation, and the present application does not make specific limitations here.

[0046] In a possible embodiment, the first press roller 10 is connected to a pressurizing device. The pressurizing device is arranged above the first press roller 10 and is used to apply pressure to the first press roller 10 to adjust the distance between the first press roller 10 and the second press roller 11. The pressure specifically applied by the pressurizing device to the first press roller 10 can be selected according to the actual situation, and the present application does not make specific limitations here.

[0047] In a possible embodiment, in order to improve the effect of adjusting the diaphragm 15 thickness, the unwinding device 1, the transmission device 2 and the second press roller 11 are at the same height as the inlet 8 and the outlet 9 of the heating device.

[0048] The embodiment of the present application also provides a diaphragm. The diaphragm is prepared by the diaphragm thickness adjusting device disclosed in the above embodiment, and the thickness fluctuation of the prepared diaphragm is small.

[0049] Among them, when the existing separator is wound around the tab, the alignment of the tabs is relatively poor, and the difference is usually 7-10 mm. When the separator produced by the above embodiments is wound around the tab, the alignment of the tabs is good, and the difference can be controlled within 2 mm, greatly reducing the thickness fluctuation of the separator, improving the thickness consistency of the separator, and being able to synchronously improve the winding tab alignment and the production yield.

[0050] In the present utility model, specific embodiments are used to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A diaphragm thickness adjustment device, characterized in that: include: Set along the forward direction of the diaphragm, Unwinding device; A transmission device, comprising a roller, wherein the roller drives the diaphragm to move by rotating; The heating device comprises a box body, the box body is provided with an inlet and an outlet for the diaphragm to enter and exit, the box body is provided with a heating part, and the heating part comprises a channel for the heating medium to flow; The pressing roller device comprises a first pressing roller and a second pressing roller arranged on both sides of the advancing direction of the diaphragm, and the distance between the first pressing roller and the second pressing roller is adjustable to adjust the thickness of the diaphragm.

2. A diaphragm thickness adjustment device according to claim 1, characterized in that: The box body is provided with an inlet and an outlet for the heating medium to enter and exit the channel, and the inlet and the outlet are connected with the heating part and the outside of the box body.

3. A diaphragm thickness adjustment device according to claim 2, characterized in that: The inlet is connected to a first pipeline, and the outlet is connected to a second pipeline.

4. A diaphragm thickness adjustment device according to claim 1, characterized in that: The heating medium includes at least one of heat transfer oil, steam or water.

5. The diaphragm thickness adjustment device according to claim 1, characterized in that: The heating temperature of the heating device is 60°C to 70°C.

6. A diaphragm thickness adjustment device according to claim 2, characterized in that: The inlet and the outlet are arranged on two opposite sides of the box body, and the feed inlet and the discharge outlet are arranged on two opposite sides of the box body.

7. A diaphragm thickness adjustment device according to claim 1, characterized in that: The unwinding device, the transmission device and the second pressing roller are at the same height as the inlet and outlet of the heating device.

8. The diaphragm thickness adjustment device according to claim 1, characterized in that: The pressure roller device comprises an adjusting bearing and a fixed bearing, wherein the adjusting bearing is arranged above the fixed bearing, the first pressure roller is connected to the adjusting bearing, and the second pressure roller is connected to the fixed bearing.

9. The diaphragm thickness adjustment device according to claim 1, characterized in that: The first pressing roller is connected to a pressing device, and the pressing device is arranged above the first pressing roller.

10. A diaphragm, characterized in that: The diaphragm is made by the diaphragm thickness adjusting device according to any one of claims 1 to 9.

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