Thermal compounding roller device and thermal compounding equipment

Abstract

The utility model provides a thermal compounding roller device and thermal compounding equipment, the thermal compounding roller device comprises at least one thermal compounding roller assembly, the thermal compounding roller assembly comprises a thermal compounding roller, the thermal compounding roller is provided with a cooling cavity, and the cooling cavity is used for accommodating a cooling medium to cool the thermal compounding roller.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, specifically to a thermal composite roller device and thermal composite equipment. Background Technology

[0002] The battery electrode thermal bonding process involves heating the electrode sheets before feeding them onto a thermal bonding roller to thermally bond them with a separator to form a thermally bonded electrode assembly. The thermal bonding roller is used to increase the rolling pressure. The surface temperature of the thermal bonding roller rises with increasing production time, causing the adhesive on the separator surface to adhere to the roller, leading to separator damage and short circuits in the stacked core package formed by the thermally bonded electrode assembly. In related technologies, a wiping mechanism is used to clean the surface of the thermal bonding roller, but this still cannot effectively clean the surface. Utility Model Content

[0003] The present invention provides a thermal lamination roller device and thermal lamination equipment, which can improve the technical problem of the thermal lamination roller easily sticking to the adhesive on the diaphragm surface.

[0004] In a first aspect, embodiments of the present invention provide a thermal composite roller device, the thermal composite roller device including at least one thermal composite roller assembly, including a thermal composite roller, the thermal composite roller being provided with a cooling cavity, the cooling cavity being used to contain a cooling medium to cool the thermal composite roller.

[0005] In one embodiment, the thermal composite roller assembly further includes a cooling pipe disposed within the cooling chamber, the cooling pipe being used to contain the cooling medium; the thermal composite roller includes a rolling section, the rolling section being provided with the cooling chamber; wherein, the cooling pipe is disposed within the cooling chamber.

[0006] In one embodiment, the cooling pipe is spiral or wavy and is connected to the cavity wall of the cooling chamber.

[0007] In one embodiment, the thermal composite roller further includes a first base portion connected to one end of the roller pressing portion, and a liquid guiding portion connected to the first base portion. The first base portion is provided with a first thermal composite roller liquid guiding hole and a second thermal composite roller liquid guiding hole, and the liquid guiding portion is provided with a liquid guiding hole. The first thermal composite roller liquid guiding hole is connected to the second thermal composite roller liquid guiding hole in sequence through the cooling pipe and the liquid guiding hole.

[0008] In one embodiment, the thermal composite roller further includes a second base portion connected to the other end of the roller pressing portion, and the liquid guiding portion is connected between the first base portion and the second base portion. The second base portion is provided with a third thermal composite roller liquid guiding hole, wherein the first thermal composite roller liquid guiding hole is connected to the third thermal composite roller liquid guiding hole in sequence through the cooling pipe, the second thermal composite roller liquid guiding hole and the liquid guiding hole.

[0009] In one embodiment, the liquid guiding portion is disposed within the cooling chamber.

[0010] In one embodiment, the thermal composite roller assembly further includes a slip ring connected to the first base portion. The outer surface of the slip ring is provided with a slip ring inlet groove and a slip ring outlet groove spaced apart. The slip ring inlet groove is connected to the first thermal composite roller guide hole, and the slip ring outlet groove is connected to the second thermal composite roller guide hole.

[0011] In one embodiment, the slip ring is further provided with a slip ring inlet hole and a slip ring outlet hole inside, the slip ring inlet hole being connected to the slip ring inlet groove, and the slip ring outlet hole being connected to the slip ring outlet groove.

[0012] In one embodiment, the thermal composite roller assembly further includes a slip ring bracket, the slip ring being fixed to the inner cavity of the slip ring bracket and rotating relative to the slip ring bracket, the slip ring bracket having a bracket liquid inlet hole and a bracket liquid outlet hole, the bracket liquid inlet hole communicating with the slip ring liquid inlet groove, and the bracket liquid outlet hole communicating with the slip ring liquid outlet groove.

[0013] In one embodiment, the surface temperature of the thermal composite roller is set to be no less than 25°C and no more than 30°C.

[0014] Secondly, embodiments of this utility model provide a thermal bonding device, including the aforementioned thermal bonding roller device and a stacking device. The thermal bonding roller device is configured to process and form multiple thermal bonding electrode assemblies, and the stacking device is configured to stack multiple thermal bonding electrode assemblies.

[0015] The beneficial effects of the embodiments of this utility model are as follows:

[0016] In an embodiment of this utility model, a cooling chamber is provided inside the hot composite roller, which is used to contain a cooling medium. Because the hot composite roller is cooled by the cooling medium in the cooling chamber, the surface of the hot composite roller will not reach a high temperature. Therefore, during the continuous rolling process of the hot composite roller on the diaphragm, the adhesive on the diaphragm surface will not stick, thus keeping the surface of the hot composite roller clean during the continuous hot composite process. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments 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.

[0018] Figure 1This is a three-dimensional schematic diagram of the thermal composite roller device provided in an embodiment of this utility model;

[0019] Figure 2 This is a cross-sectional structural diagram of the thermal composite roller device provided in an embodiment of this utility model;

[0020] Figure 3 yes Figure 2 A magnified view of a portion of the image;

[0021] Figure 4 This is a perspective view of the thermal composite roller 1 provided in an embodiment of this application;

[0022] Figure 5 This is a cross-sectional structural diagram of a thermal composite roller provided in one embodiment of this application;

[0023] Figure 6 This is a perspective view of a slip ring provided in one embodiment of this application;

[0024] Icon labels:

[0025] 100. Thermal composite roller device;

[0026] 10. Thermal composite roller assembly; 101. First thermal composite roller assembly; 102. Second thermal composite roller assembly; 20. Mounting bracket;

[0027] 1. Thermal composite roller; 11. Cooling chamber; 121. First base part; 122. Second base part; 123. Roll pressing part; 13. Liquid guiding part; 131. Liquid guiding hole; 141. Liquid guiding hole of the first thermal composite roller; 142. Liquid guiding hole of the second thermal composite roller; 143. Liquid guiding hole of the third thermal composite roller;

[0028] 2. Cooling pipe; 21. Cooling pipe inlet; 22. Cooling pipe outlet;

[0029] 3. Slip ring; 31. Slip ring inlet groove; 32. Slip ring outlet groove; 33. Slip ring inlet hole; 34. Slip ring outlet hole;

[0030] 4. Slip ring support; 41. Support inlet; 42. Support outlet;

[0031] 5. Drive components;

[0032] 6. Lifting mechanism; Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0034] The battery electrode thermal bonding process involves heating the electrode sheets before feeding them onto a thermal bonding roller to thermally bond them with a separator to form a thermally bonded electrode assembly. The thermal bonding roller is used to increase the rolling pressure. The surface temperature of the thermal bonding roller rises with increasing production time, causing the adhesive on the separator surface to adhere to the roller, leading to separator damage and short circuits in the stacked core package formed by the thermally bonded electrode assembly. In related technologies, a wiping mechanism is used to clean the surface of the thermal bonding roller, but this still cannot effectively clean the surface.

[0035] An embodiment of this application provides a thermal composite roller device, such as... Figure 1 As shown, the thermal composite roller device includes at least one thermal composite roller assembly 10 and a mounting bracket 20.

[0036] Continue to refer to Figure 1 and Figure 2 The thermal composite roller assembly 10 includes a first thermal composite roller assembly 101 and a second thermal composite roller assembly 102. The electrode sheet to be composited and the diaphragm are sandwiched between the first thermal composite roller assembly 101 and the second thermal composite roller assembly 102 and are formed by roller pressing.

[0037] The thermal bonding roller assembly 10 includes a thermal bonding roller 1. The thermal bonding roller assembly 10 mainly provides rolling pressure to the electrode sheet and diaphragm to be bonded during the rotation of the cylindrical thermal bonding roller 1. The mounting bracket 20 is provided with a thermal bonding roller receiving cavity, in which the thermal bonding roller 1 is rotatably mounted.

[0038] The hot-compositing roller 1 is equipped with a cooling chamber 11, which contains a cooling medium to cool the hot-compositing roller 1. Because the hot-compositing roller 1 is cooled by the internal cooling medium, its surface does not generate a high temperature due to contact with the heated electrode. Consequently, since the surface of the hot-compositing roller 1 does not reach a high temperature, the adhesive on the diaphragm surface will not adhere during the continuous rolling process, thus keeping the surface of the hot-compositing roller 1 clean during continuous hot-compositing.

[0039] In some embodiments, the temperature and flow rate of the cooling medium are designed so that the surface temperature of the thermally composited roller 1 is not less than room temperature and not greater than 30°C, where room temperature is approximately 25°C. The adhesive on the diaphragm surface is primarily composed of polymer. The inventors have discovered that when the surface temperature of the thermally composited roller 1 is maintained between 25°C and 30°C, the adhesion between the adhesive on the surface of the thermally composited roller 1 and the diaphragm surface is low, effectively preventing adhesion between the thermally composited roller 1 and the adhesive on the diaphragm. It is understandable that if the surface temperature of the thermally composited roller 1 is set below room temperature, the temperature of the cooling medium supplied to the thermally composited roller needs to be relatively low and the flow rate relatively high, which is not conducive to reducing production costs. If the surface temperature of the thermally composited roller 1 is set above 30°C, adhesion will occur between the thermally composited roller 1 and the adhesive on the diaphragm surface.

[0040] In some embodiments, reference Figure 2 The thermal composite roller assembly 10 includes a thermal composite roller 1 and a cooling pipe 2. The cooling pipe 2 is disposed in the cooling chamber 11 of the thermal composite roller 1. The cooling pipe 2 can be a spirally extended cooling pipe or a wavy extended cooling pipe.

[0041] refer to Figures 2 to 4 The hot-compositing roller 1 includes a first base portion 121, a second base portion 122, and a rolling portion 123. The rolling portion 123 is located between the first base portion 121 and the second base portion 122, and the outer diameter of the rolling portion 123 is larger than the outer diameter of either the first base portion 121 or the second base portion 122. A cooling pipe 2 is connected between the first base portion 121 and the second base portion 122. During the electrode hot-compositing process, the hot-compositing roller 1 provides rolling pressure through the rolling portion 123. The extension length of the cooling pipe 2 along the axial direction of the hot-compositing roller 1 is greater than the extension length of the rolling portion 123 along the axial direction of the hot-compositing roller 1, so that the outer surface of the rolling portion 123 of the hot-compositing roller 1 can be sufficiently cooled by the cooling pipe 2.

[0042] In some embodiments, continue to refer to Figures 3 to 5The hot composite roller 1 is also provided with a liquid guiding section 13, which is tubular and located on the central axis of the hot composite roller 1. The liquid guiding section 13 is located between the first base section 121 and the second base section 122, and the cooling pipe 2 is arranged around the liquid guiding section 13. The liquid guiding section 13 remains fixed during the rotation of the hot composite roller 1.

[0043] The first base portion 121 is provided with a first thermal composite roller liquid guiding hole 141 and a second thermal composite roller liquid guiding hole 142. The first thermal composite roller liquid guiding hole 141 and the second thermal composite roller liquid guiding hole 142 are not connected and are spaced apart and axially penetrate the first base portion 121. The second base portion 122 is provided with a third thermal composite roller liquid guiding hole 143. The liquid guiding portion 13 is provided with a liquid guiding hole 131, which connects the second thermal composite roller liquid guiding hole 142 and the third thermal composite roller liquid guiding hole 143.

[0044] The inlet of cooling pipe 2 is connected to the first liquid guide hole 141 of the first thermal composite roller of the first base part 121, and the outlet of cooling pipe 2 is connected to the second liquid guide hole 142 of the second thermal composite roller of the second base part 122. The liquid guide part 13 is located at the center of the cooling chamber 11 of the thermal composite roller 1. The second liquid guide hole 142 is connected to the liquid guide hole 131 of the liquid guide part 13, and the third liquid guide hole 143 of the thermal composite roller is configured to be connected to the liquid guide part 13 along the axial direction. During the rotation of the thermal composite roller 1, cooling pipe 2 is fixed to the thermal composite roller 1 and rotates with the thermal composite roller 1, while the liquid guide part 13 is located on its central axis and remains fixed.

[0045] The cooling medium enters through the inlet of the first hot composite roller guide hole 141 of the first base part 121 of the hot composite roller 1 and flows into the inlet of the cooling pipe 2 through the outlet of the first hot composite roller guide hole 141. It flows inside the cooling pipe 2 to cool the hot composite roller 1. The circulated cooling medium flows into the third hot composite roller guide hole 143 of the second base part 122 through the outlet of the cooling pipe 2, and then flows into the guide hole 131 of the guide part 13 located at its center through the third hot composite roller guide hole 143. It then flows into the second hot composite roller guide hole 142 of the first base part 121 through the guide hole 131, and then flows out of the hot composite roller 1.

[0046] In some embodiments, such as Figures 2 to 6As shown, the thermal composite roller assembly 10 also includes a slip ring 3, which is connected to the first base portion 121 of the thermal composite roller 1. A sealing ring is provided at the connection between the slip ring 3 and the first base portion 121 of the thermal composite roller 1, thereby forming a sealed connection between the slip ring 3 and the thermal composite roller 1. The slip ring 3 is provided with a slip ring inlet groove 31 and a slip ring outlet groove 32, which are both provided on the outer surface of the slip ring 3 and are spaced apart. The slip ring inlet groove 31 is connected to the first thermal composite roller guide hole 141, and the slip ring outlet groove 32 is connected to the third thermal composite roller guide hole 143. The slip ring 3 is connected to the first base portion 121 of the thermal composite roller 1 and rotates with the thermal composite roller 1. The thermal composite roller 1 is installed in the thermal composite roller receiving cavity of the mounting bracket 20, and the slip ring 3 is rotatably installed on the outside of the mounting bracket 20.

[0047] Inside the slip ring 3, there are also slip ring inlet hole 33 and slip ring outlet hole 34. The slip ring inlet hole 33 is connected to the slip ring inlet groove 31 and the first hot composite roller guide hole 141 of the first base part 121 of the hot composite roller 1. The slip ring outlet hole 34 is connected to the second hot composite roller guide hole 142 of the first base part 121 of the hot composite roller 1 and the slip ring outlet groove 32.

[0048] In some embodiments, continue to refer to Figures 2 to 6 The thermal composite roller assembly 10 also includes a slip ring bracket 4. The slip ring 3 is fixed in the inner cavity of the slip ring bracket 3 and rotates relative to the slip ring bracket 4. The slip ring bracket 4 is provided with a bracket inlet hole 41 and a bracket outlet hole 42. The outlet of the bracket inlet hole 41 is located above the slip ring 3 and is connected to the slip ring inlet groove 31. The inlet of the bracket outlet hole 42 is located below the slip ring 3 and is connected to the slip ring outlet groove 32.

[0049] In specific implementation, the inlet of the support liquid inlet hole 41 and the outlet of the support liquid outlet hole 42 are both located on the same end face of the slip ring support 4. The external cooling medium enters the support liquid inlet hole 41 and sequentially passes through the slip ring liquid inlet groove 31, the slip ring liquid inlet hole 33, and the first hot composite roller guide hole 141 of the first base part 121 of the hot composite roller 1 to supply the cooling pipe 2. After sufficient circulation inside the cooling pipe 2, the cooling medium flows into the second hot composite roller of the second base part 122 through the outlet of the cooling pipe 2. The liquid flows into the liquid guide hole 131 of the liquid guide part 13 located at its center through the second hot composite roller liquid guide hole 142, and into the third hot composite roller liquid guide hole 143 of the first base part 121 through the liquid guide hole 131, and into the slip ring outlet hole 34 of the slip ring 3 through the third hot composite roller liquid guide hole 143, and into the slip ring outlet groove 32 through the slip ring outlet hole 34, and then into the support outlet hole 42 of the slip ring support 4 through the slip ring outlet groove 32 and then out.

[0050] The slip ring 3 rotates relative to the slip ring support 3. The slip ring inlet groove 31 and the slip ring outlet groove 32 are both set as circumferentially extending annular grooves. Therefore, during the rotation of the slip ring 3, the support inlet hole 41 of the slip ring support 4 is always connected to the slip ring inlet groove 31 of the slip ring 3, and the support outlet hole 42 of the slip ring support 4 is always connected to the slip ring outlet groove 32 of the slip ring 3.

[0051] During the thermal bonding process of the heated electrode and diaphragm in the thermal bonding roller device 100, the cooling medium in the cooling pipe 2 inside the thermal bonding roller 1 provides cooling to the thermal bonding roller 1. This prevents the temperature of the outer surface of the thermal bonding roller 1 from rising due to contact with the heated electrode, thus preventing adhesion between the surface of the thermal bonding roller 1 and the adhesive on the diaphragm surface, thereby cleaning the surface of the thermal bonding roller 1 at the source. The cooling medium in the cooling pipe 2 can set the surface temperature of the thermal bonding roller 1 to be no less than 25°C and no more than 30°C. The surface temperature of the thermal bonding roller 1 can be 25°C, 26°C, 27°C, 28°C, 29°C, 30°C, or any two of the above temperatures, or a range between any two of the above temperatures. It is understood that if the surface temperature of the thermal bonding roller 1 is maintained at 25°C, the flow rate of the cooling medium inside the cooling pipe 2 is faster and the temperature of the cooling medium is lower; if the surface temperature of the thermal bonding roller 1 is maintained at 30°C, the flow rate of the cooling medium inside the cooling pipe 2 is slower and the temperature of the cooling medium is lower. In actual production, the flow parameters of the cooling medium can be adjusted as needed.

[0052] The thermal composite roller assembly 10 also includes a drive unit 5 and a lifting mechanism 6.

[0053] The driving component 5 is used to drive the hot composite roller 1 and the slip ring 3 connected to one end of the hot composite roller 1 to rotate. The cooling pipe 2 inside the hot composite roller 1 is fixed inside the hot composite roller 1 and thus rotates together with the hot composite roller 1. The driving component 5 can be a motor. The driving component 5 is rotatably connected to the hot composite roller 1 through a coupling to one end, and the slip ring 3 is connected to the other end of the hot composite roller 1.

[0054] The lifting mechanism 6 is connected to the first thermal composite roller assembly 101 and is used to control the lifting and lowering of the first thermal composite roller assembly 101 within the inner cavity of the mounting bracket 20, thereby keeping the first thermal composite roller assembly 101 and the second thermal composite roller assembly 102 close to or far apart from each other. When the first thermal composite roller assembly 101 and the second thermal composite roller assembly 102 are close to each other, the thermal composite roller device 100 performs thermal composite, and the first thermal composite roller assembly 101 and the second thermal composite roller assembly 102 provide rolling pressure to the electrode sheet and diaphragm sandwiched between them. When the first thermal composite roller assembly 101 and the second thermal composite roller assembly 102 are far apart from each other, the thermal composite roller device 100 stops performing thermal composite.

[0055] The embodiments of this application also provide a thermal bonding device, which includes the thermal bonding roller device and the thermal bonding stacking device provided in the above embodiments. The thermal bonding roller device is configured to roll and bond the heated positive electrode sheet, the separator and the heated negative electrode sheet together by the thermal bonding roller 1 to form a plurality of thermally bonded electrodes. The thermal bonding stacking device is configured to stack a plurality of thermally bonded electrodes to form a core package.

[0056] In the thermal bonding equipment provided in the embodiments of this application, since the thermal bonding roller of the thermal bonding roller device has a cooling chamber inside, and the cooling chamber contains a cooling medium, the cooling medium can cool the thermal bonding roller. Therefore, even if the thermal bonding roller comes into contact with the heated positive and negative electrode sheets during the rolling process, the thermal bonding roller is cooled by the cooling medium inside it, and the surface of the thermal bonding roller can maintain a temperature of about room temperature. Since the surface of the thermal bonding roller is not heated to a high temperature by the heated positive or negative electrode sheets, the adhesion between the surface of the thermal bonding roller and the adhesive on the surface of the diaphragm is poor, so that the surface of the thermal bonding roller will not stick to the adhesive on the surface of the diaphragm, thus keeping the surface of the thermal bonding roller clean.

[0057] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A thermal composite roller device, characterized in that, include: At least one thermal composite roller assembly includes a thermal composite roller, the thermal composite roller being provided with a cooling chamber, the cooling chamber being used to contain a cooling medium to cool the thermal composite roller; The thermal composite roller assembly further includes a cooling pipe disposed within the cooling chamber, the cooling pipe being used to contain the cooling medium; the thermal composite roller includes a rolling section, the rolling section being provided with the cooling chamber; wherein, the cooling pipe is disposed within the cooling chamber; The thermal composite roller further includes a first base portion connected to one end of the roller pressing portion, and a liquid guiding portion connected to the first base portion. The first base portion is provided with a first thermal composite roller liquid guiding hole and a second thermal composite roller liquid guiding hole, and the liquid guiding portion is provided with a liquid guiding hole. The first thermal composite roller liquid guiding hole is connected to the second thermal composite roller liquid guiding hole in sequence through the cooling pipe and the liquid guiding hole.

2. The thermal composite roller device according to claim 1, characterized in that, The cooling pipe is spiral or wavy and is connected to the wall of the cooling chamber.

3. The thermal composite roller device according to claim 1, characterized in that, The thermal composite roller also includes a second base portion connected to the other end of the roller pressing portion. The liquid guiding portion is connected between the first base portion and the second base portion. The second base portion is provided with a third thermal composite roller liquid guiding hole. The first thermal composite roller liquid guiding hole is connected to the third thermal composite roller liquid guiding hole in sequence through the cooling pipe, the second thermal composite roller liquid guiding hole and the liquid guiding hole.

4. The thermal composite roller device according to claim 1, characterized in that, The liquid guiding section is disposed inside the cooling chamber.

5. The thermal composite roller device according to claim 1, characterized in that, The thermal composite roller assembly also includes a slip ring connected to the first base portion. The outer surface of the slip ring is provided with a slip ring inlet groove and a slip ring outlet groove at intervals. The slip ring inlet groove is connected to the liquid guide hole of the first thermal composite roller, and the slip ring outlet groove is connected to the liquid guide hole of the second thermal composite roller.

6. The thermal composite roller device according to claim 5, characterized in that, The slip ring is also provided with a slip ring inlet hole and a slip ring outlet hole inside. The slip ring inlet hole is connected to the slip ring inlet groove, and the slip ring outlet hole is connected to the slip ring outlet groove.

7. The thermal composite roller device according to claim 6, characterized in that, The thermal composite roller assembly also includes a slip ring bracket. The slip ring is fixed to the inner cavity of the slip ring bracket and rotates relative to the slip ring bracket. The slip ring bracket is provided with a bracket liquid inlet hole and a bracket liquid outlet hole. The bracket liquid inlet hole is connected to the slip ring liquid inlet groove, and the bracket liquid outlet hole is connected to the slip ring liquid outlet groove.

8. The thermal composite roller device according to any one of claims 1 to 7, characterized in that, The surface temperature of the thermal composite roller is set to be no less than 25°C and no more than 30°C.

9. A thermal composite device, characterized in that, The invention includes the thermal composite roller device and the stacking device according to any one of claims 1 to 8, wherein the thermal composite roller device is configured to process and form a plurality of thermal composite electrode assemblies, and the stacking device is configured to stack a plurality of the thermal composite electrode assemblies.

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