A laminating machine with diaphragm cooling function

Abstract

The application provides a lamination machine with a diaphragm cooling function, comprising a winding shaft, a cooling assembly and a lamination assembly, which are used for fixing and driving the diaphragm winding to unwind, forming a diaphragm unwinding path between the winding shaft and the lamination assembly, and the cooling assembly is arranged on the diaphragm unwinding path and used for cooling the diaphragm passing through the cooling assembly during unwinding; the above scheme can effectively inhibit the stretching and contraction of the diaphragm during tension adjustment by cooling the unwound diaphragm with the cooling assembly, avoid the influence of diaphragm contraction lag on the lamination, and improve the stability and consistency of the prepared battery cell.

Description

Technical Field

[0001] This invention belongs to the field of battery production equipment technology, specifically, it relates to a stacking machine with a diaphragm cooling function. Background Technology

[0002] In order to ensure the consistency of stacking, existing lamination equipment usually requires adjusting the tension of the diaphragm through roller groups. However, it has been found in use that due to the high stacking speed, the length compensation requirement of the diaphragm during the movement of the stacking table will cause the tension of the diaphragm to fluctuate. This tension fluctuation will lead to stretching, and the difference in shrinkage after stacking will also lead to a decrease in stacking efficiency and consistency, which will significantly affect the performance of the battery cell.

[0003] To address this issue, existing technologies typically involve placing guide rollers on swing arms to absorb the stretching and contraction of the diaphragm, thereby improving stacking efficiency and consistency. Alternatively, a diaphragm buffer mechanism that works in conjunction with a tension control mechanism can be used to absorb the stretching and contraction of the diaphragm. However, these solutions cannot effectively suppress the stretching and contraction of the diaphragm, and the contraction of the diaphragm requires a certain amount of time. During high-speed stacking, the diaphragm often has not yet completed its contraction before being stacked into the cell, which still affects the cell performance.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] In order to at least solve one of the problems in the prior art, the present invention provides a stacking machine with a diaphragm cooling function. By cooling the diaphragm during the diaphragm conveying process, the expansion and contraction of the diaphragm are suppressed at low temperatures, the amount of stretching and shrinkage of the diaphragm is reduced, and its impact on the performance of the battery cell is reduced or even eliminated, thereby improving the quality and performance consistency of the battery cell.

[0006] To achieve the above objectives, the present invention provides a stacking machine with diaphragm cooling function, including a roller, a cooling component and a stacking component. The roller is used to fix and drive the diaphragm roll to rotate for unwinding. A diaphragm unwinding path is formed between the roller and the stacking component. The cooling component is disposed on the diaphragm unwinding path and is used to cool the diaphragm that passes through the cooling component during the unwinding process.

[0007] Furthermore, the cooling component periodically blows low-temperature gas into the diaphragm, or continuously blows low-temperature gas into the diaphragm.

[0008] Furthermore, the cooling component includes a low-temperature air source and an air blowing unit. The air blowing unit is connected to the low-temperature air source and is located at least on one side of the diaphragm unwinding path, having an air outlet facing the adjacent diaphragm unwinding path.

[0009] Furthermore, the projection of the air outlet onto the plane of the adjacent diaphragm unwinding path is perpendicular to the unwinding direction of the diaphragm, and the projection of the air outlet crosses the diaphragm unwinding path on the projection plane.

[0010] Preferably, the distance between the air outlet and the diaphragm unwinding path is kept consistent on the same air blowing unit.

[0011] Furthermore, the low-temperature gas source includes a gas supply unit, a delivery pipeline, and a cooling mechanism. The gas supply unit is connected to the gas blowing unit through the delivery pipeline, and the cooling structure is located on the delivery pipeline to cool the gas in the delivery pipeline.

[0012] Furthermore, the cooling mechanism includes a semiconductor refrigeration chip, a power supply unit, a heat dissipation unit, and a heat transfer unit. The power supply unit is electrically connected to the semiconductor refrigeration chip, the heat dissipation unit is located on the heating side of the semiconductor refrigeration chip, the heat transfer unit is attached to the cooling side of the semiconductor refrigeration chip, and the delivery pipeline is in contact with the heat transfer unit.

[0013] Furthermore, the delivery pipeline includes a first pipe section located between the heat transfer unit and the air supply unit, a second pipe section located between the heat transfer unit and the air blowing unit, and two third pipe sections that are in contact with the heat transfer unit respectively. The third pipe section is spirally coiled, and the first pipe section and the second pipe section are respectively connected to the third pipe section from both ends of the third pipe section.

[0014] Furthermore, the third pipe segment is detachably connected to the heat transfer unit, or the third pipe segment is integrally formed with the heat transfer unit.

[0015] Furthermore, the heat transfer unit is a heat transfer plate that is attached to the thermoelectric cooler. The area of ​​the heat transfer plate is larger than that of the thermoelectric cooler. The heat transfer plate and the heat dissipation unit have threaded holes that are positioned opposite each other. The two are connected by screws and the distance between them is adjustable. The screws are positioned to avoid the thermoelectric cooler.

[0016] Furthermore, the cooling component is located at one end of the diaphragm conveying path near the reel.

[0017] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0018] 1. Because a cooling component is installed on the unwinding path of the diaphragm, the temperature of the diaphragm is reduced to about 0°C after being cooled by the cooling component. This can effectively suppress the stretching and shrinkage of the diaphragm during the tension adjustment process, thereby avoiding the impact of diaphragm shrinkage lag on the stacking and improving the stability and consistency of the battery cell.

[0019] 2. The projection of the air blowing unit onto the plane of the adjacent diaphragm unwinding path is perpendicular to and spans the diaphragm unwinding path, thereby blowing low-temperature gas onto the diaphragm in a uniform air curtain manner, improving the temperature uniformity of diaphragm cooling.

[0020] 3. The heat dissipation unit and the heat transfer unit are connected by screws and the distance is adjustable, which can fix the semiconductor cooling chip from both ends, improve the convenience of disassembly, and make it easy to replace and maintain; the cooling component is set at one end of the diaphragm conveying path near the reel, that is, the diaphragm is cooled immediately after unwinding, which can ensure that the diaphragm on the unwinding path is at a lower temperature and better suppress the stretching and shrinkage of the diaphragm. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the stacking machine described in Embodiment 1 of the present invention, including the winding shaft, the diaphragm unwinding path, and the cooling assembly.

[0022] Figure 2 yes Figure 1 The side view of the stacking machine shown;

[0023] Figure 3 This is a schematic diagram of a cooling mechanism in the stacking machine described in Embodiment 2 of the present invention;

[0024] Figure 4 yes Figure 3 The diagram shows a structural schematic of a heat transfer unit in a cooling mechanism.

[0025] In the diagram: 1. Roller; 2. Air blowing unit; 3. Conveying pipeline; 31. First pipe section; 32. Second pipe section; 33. Third pipe section; 4. Cooling mechanism; 41. Semiconductor cooling chip; 42. Heat dissipation unit; 421. Fin; 43. Heat transfer unit; 431. Channel; 5. First guide roller; 6. Second guide roller; 7. Connecting plate. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0027] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] This invention provides a stacking machine with diaphragm cooling function, such as... Figures 1 to 4 As shown, the device includes a spool 1, a cooling assembly, and a stacking assembly (not shown in the figure). The spool 1 is used to fix the diaphragm roll and drive the diaphragm roll to rotate for unwinding. The unwound diaphragm is unwound along the diaphragm unwinding path to the stacking assembly for stacking. As one embodiment of the invention, a guide roller group is provided between the spool 1 and the stacking assembly, forming a diaphragm unwinding path to guide the unwinding of the diaphragm. The cooling assembly is located on the diaphragm unwinding path to cool the diaphragm unwound along the path. The temperature of the cooled diaphragm is around 0°C, which can effectively suppress the stretching and retraction that occur during unwinding and tension adjustment, and will not affect the normal stacking process due to the diaphragm retraction lag, thereby improving the stacking efficiency and cell quality.

[0030] In the above scheme, the stacking machine has a vertically arranged connecting plate 7, the roller 1 is connected to the connecting plate 7 and is rotatable relative to the connecting plate 7, and the cooling component can also be connected to the connecting plate 7, or the cooling component can be fixed in the stacking machine by an independent structure.

[0031] The present invention will now be described in further detail with reference to specific embodiments.

[0032] Example 1

[0033] As an embodiment of the present invention, this embodiment provides a stacking machine with diaphragm cooling function, wherein the cooling component is disposed at one end of the diaphragm unwinding path near the winding shaft 1.

[0034] like Figure 1 As shown, the guide roller group in this embodiment includes a first guide roller 5 and a second guide roller 6 arranged sequentially along the unwinding path of the diaphragm. The first guide roller 5 is located upstream of the second guide roller 6 and adjacent to the winding shaft 1 as an unwinding roller. The cooling component is located between the unwinding roller and the second guide roller 6, and the diaphragm is cooled by blowing low-temperature gas onto the diaphragm.

[0035] Specifically, in this embodiment, only one cooling component is provided. The cooling component includes an air blowing unit 2 and a low-temperature air source connected to the air blowing unit 2. The two opposite ends of the air blowing unit 2 form an air outlet and an air inlet, respectively. With the side with the air outlet as the lower base and the side with the air inlet as the upper base, the whole structure is an isosceles triangle. The side with the air outlet faces the diaphragm unwinding path. The air outlet is elongated and its projection on the plane of the diaphragm unwinding path between the unwinding roller and the second guide roller 6 is perpendicular to the diaphragm unwinding direction. The distance between the elongated air outlet and the diaphragm unwinding path is consistent at all points, thereby achieving low-temperature air supply. The uniform blowing of the body onto the diaphragm improves the uniformity of cooling and suppresses the vibration of the diaphragm during the blowing process. The blowing unit 2 is connected to the low-temperature gas source through the air inlet. In this embodiment, the low-temperature gas source is an air compressor (not shown in the figure) containing a heat pump system, which includes a delivery pipeline 3 and is connected to the blowing unit 2 through the delivery pipeline 3. The gas delivered from the air compressor is cooled by the heat pump system and then delivered to the blowing unit 2 through the delivery pipeline 3. In order to avoid the heat pump system from affecting the working environment of the stacking machine, the evaporator and condenser of the heat pump system (not shown in the figure) are set separately, and the condenser is set outside the stacking machine.

[0036] In other embodiments, the orientation and shape of the air outlet can also be adjusted according to actual needs. For example, in order to increase the blowing area of ​​the air outlet, the air outlet can be set to other shapes such as ellipse, circle, rectangle, etc. The side with the air outlet can also be set at an acute or obtuse angle with the diaphragm unwinding path. By tilting the air outlet, the impact force on the diaphragm can be further reduced, thereby avoiding large-scale vibration of the diaphragm. In addition, multiple air blowing units 2 can be set in a set of cooling components. The multiple air blowing units 2 are connected to the same low-temperature air source and are arranged side by side on the same side of the diaphragm unwinding path, or respectively set on both sides of the diaphragm unwinding path. According to actual needs, those skilled in the art can also set multiple sets of cooling components at different positions of the diaphragm conveying path. Based on the knowledge of the technical principles of the present invention, the solution obtained by simply making conventional adjustments to the number and setting position of the cooling components also falls within the protection scope of the present invention.

[0037] Example 2

[0038] As another embodiment of the present invention, the difference between this embodiment and Embodiment 1 is that the structure of the low-temperature gas source is different.

[0039] The low-temperature gas source includes a gas supply unit, a delivery pipeline 3, and a cooling mechanism 4. In this embodiment, the gas supply unit is an air compressor. The gas delivered by the air compressor is delivered to the air blowing unit 2 through the delivery pipeline 3. The cooling mechanism 4 is installed on the delivery pipeline 3 to cool the airflow flowing through the delivery pipeline 3 during the delivery process.

[0040] Specifically, in this embodiment, the air supply unit is an air compressor, such as... Figure 2As shown, the cooling mechanism 4 is fixed on the connecting plate 7 and includes a semiconductor refrigeration chip 41, a power supply unit, a heat dissipation unit 42, and a heat transfer unit 43. The power supply unit is electrically connected to the semiconductor refrigeration chip 41 and is used to supply power to the semiconductor refrigeration chip 41. The cooling side of the semiconductor refrigeration chip 41 is in close contact with the heat transfer unit 43, and the delivery pipe 3 is in contact with the heat transfer unit 43. The airflow in the delivery pipe 3 is cooled by the low temperature of the cooling side. Since the other side of the semiconductor refrigeration chip 41 is the heating side, a heat dissipation unit 42 is also provided on the heating side. The heat dissipation unit 42 is a tower heat sink or a down-pressure heat sink. In this embodiment, the heat dissipation unit 42 is a tower heat sink. In order to improve the heat dissipation effect, a thermally conductive coating is also coated on the heating side of the semiconductor refrigeration chip 41.

[0041] To facilitate the fixing of the cooling mechanism 4, such as Figure 3 As shown, in this embodiment, the heat transfer unit 43 is configured as a heat transfer plate, which is a copper plate with an area larger than that of the thermoelectric cooler 41. Through holes are provided in the empty space after the heat transfer unit 43 and the thermoelectric cooler 41 are attached. Threaded holes are also provided at corresponding positions on the heat dissipation unit 42. In this embodiment, to facilitate the setting of the threaded holes, fins 421 with threaded holes are additionally provided on the side of the heat dissipation tower near the thermoelectric cooler 41 in the tower radiator. Screws pass through the through holes and engage with the threaded holes to connect the heat transfer unit 43 and the heat dissipation unit 42. The distance between the heat transfer unit 43 and the heat dissipation unit 42 is adjusted by the screws, allowing the thermoelectric cooler 41 to... The thermoelectric cooler 41 is stably clamped between the heat transfer unit 43 and the heat dissipation unit 42; or, as an alternative to the above solution, a snap-fit ​​component protruding towards the heat dissipation unit 42 is provided on the heat transfer unit 43, and the connection and distance between the two are realized by the snap-fit ​​component cooperating with different areas on the heat dissipation tower fins 421; the above arrangement not only realizes the fixation of the thermoelectric cooler 41, but also facilitates the disassembly and replacement of the thermoelectric cooler 41; in order to limit the clamping position of the thermoelectric cooler 41, a groove adapted to the shape of the thermoelectric cooler 41 is formed on the surface of the heat transfer unit 43 facing the thermoelectric cooler 41, and the thermoelectric cooler 41 is partially embedded in the groove, which improves the ease of installation.

[0042] Furthermore, in this embodiment, the edge of the heat transfer unit 43 is bent inward to form a channel 431 through which the conveying pipe 3 passes, realizing a detachable connection between the heat transfer unit 43 and the conveying pipe 3, while increasing the contact area between the heat transfer unit 43 and the conveying pipe 3, thus improving the heat transfer effect; as a specific implementation of this embodiment, such as Figure 3 and Figure 4As shown, the heat transfer unit 43 is bent inward on both sides to form two parallel channels 431. The delivery pipe 3 passes through the channels 431 on both sides in sequence, forming a "U" shape to cooperate with the heat transfer unit 43. This divides the delivery pipe 3 into a first pipe section 31 located between the heat transfer unit 43 and the air supply unit, a second pipe section 32 located between the heat transfer unit 43 and the air blowing unit 2, and a third pipe section 33 located within the two channels 431 of the heat transfer unit 43 and between them. In order to further improve the cooling effect, the part of the third pipe section 33 located outside the channels 431 is arranged in a spring-like spiral, so that the third pipe section 33 is closer to the heat transfer unit 43, further increasing the heat exchange area. In order to further improve the heat exchange effect, the delivery pipe 3 is a copper pipe.

[0043] In other embodiments, the first pipe segment 31, the second pipe segment 32, and the third pipe segment 33 can also be detachably configured. In this case, the third pipe segment 33 can be integrally formed with the heat transfer unit 43, with connection ports at both ends that are respectively connected to the first pipe segment 31 and the second pipe segment 32. In this case, the third pipe segment 33 can be integrally configured with the heat transfer unit 43, while the first pipe segment 31 and the second pipe segment 32 are made of hoses of other materials, which reduces the cost of use and improves the ease of installation. When the air blowing unit 2 is set and adjusted as needed, it is easier to connect and adjust.

[0044] A support member capable of accommodating the cooling mechanism 4 is provided on the connecting plate 7. The support member is hollowed out, so that it can support the cooling mechanism without affecting the heat dissipation and the connection of the delivery pipeline 3.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. The implementation schemes in the above embodiments can also be further combined or replaced. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A stacking machine with diaphragm cooling function, characterized in that, It includes a roller (1), a cooling component and a stacking component. The roller (1) is used to fix and drive the diaphragm roll to rotate for unwinding. A diaphragm unwinding path is formed between the roller (1) and the stacking component. The cooling component is located on the diaphragm unwinding path and is used to cool the diaphragm that passes through the cooling component during the unwinding process.

2. The stacking machine with diaphragm cooling function according to claim 1, characterized in that, The cooling component periodically blows low-temperature gas into the diaphragm, or continuously blows low-temperature gas into the diaphragm.

3. The stacking machine with diaphragm cooling function according to claim 2, characterized in that, The cooling component includes a low-temperature gas source and an air blowing unit (2). The air blowing unit (2) is connected to the low-temperature gas source and is located at least on one side of the diaphragm unwinding path, and has an air outlet facing the adjacent diaphragm unwinding path.

4. The stacking machine with diaphragm cooling function according to claim 3, characterized in that, The projection of the air outlet onto the plane of the adjacent diaphragm unwinding path is perpendicular to the unwinding direction of the diaphragm, and the projection of the air outlet crosses the diaphragm unwinding path on the projection plane. On the same blowing unit (2), the distance between the air outlet and the diaphragm unwinding path remains consistent.

5. The stacking machine with diaphragm cooling function according to claim 3, characterized in that, The low-temperature gas source includes a gas supply unit, a delivery pipeline (3) and a cooling mechanism (4). The gas supply unit is connected to the air blowing unit (2) through the delivery pipeline (3). The cooling structure is located on the delivery pipeline (3) and is used to cool the gas in the delivery pipeline (3).

6. The stacking machine with diaphragm cooling function according to claim 5, characterized in that, The cooling mechanism (4) includes a semiconductor cooling chip (41), a power supply unit, a heat dissipation unit (42) and a heat transfer unit (43). The power supply unit is electrically connected to the semiconductor cooling chip (41), the heat dissipation unit (42) is located on the heat-generating side of the semiconductor cooling chip (41), the heat transfer unit (43) is attached to the cooling side of the semiconductor cooling chip (41), and the delivery pipeline (3) is in contact with the heat transfer unit (43).

7. The stacking machine with diaphragm cooling function according to claim 6, characterized in that, The delivery pipeline (3) includes a first pipe section (31) located between the heat transfer unit (43) and the air supply unit, a second pipe section (32) located between the heat transfer unit (43) and the air blowing unit (2), and two third pipe sections (33) that are in contact with the heat transfer unit (43) respectively. The third pipe section (33) is spirally coiled, and the first pipe section (31) and the second pipe section (32) are connected to the third pipe section (33) from both ends of the third pipe section (33) respectively.

8. The stacking machine with diaphragm cooling function according to claim 6, characterized in that, The delivery pipeline (3) is detachably connected to the heat transfer unit (43), or the delivery pipeline (3) and the heat transfer unit (43) are integrally formed.

9. The stacking machine with diaphragm cooling function according to claim 6, characterized in that, The heat transfer unit (43) is a heat transfer plate that is attached to the semiconductor cooling chip (41). The area of ​​the heat transfer plate is larger than the area of ​​the semiconductor cooling chip (41). The empty part after the heat transfer unit (43) is attached to the semiconductor cooling chip (41) is provided with through holes. The corresponding position on the heat dissipation unit (42) is also provided with threaded holes. The two are connected by screws and the distance is adjustable.

10. The stacking machine with diaphragm cooling function according to any one of claims 1-9, characterized in that, The cooling component is located at one end of the diaphragm conveying path near the reel (1).

Images