Hot-pressing composite apparatus and hot-pressing composite method for composite strip

Abstract

The application discloses a hot-pressing composite device for composite strip material, which comprises a heating device for heating the composite strip material and a hot-rolling composite device for hot-rolling the heated composite strip material; the hot-rolling composite device comprises a hot-pressing roller set, and a tension roller set is arranged on the two sides of the hot-pressing roller set respectively for balancing tension; the hot-pressing roller set comprises two oppositely arranged hot-pressing rollers, at least one of the two hot-pressing rollers can move along a direction vertical to the axis of the hot-pressing roller and parallel to the axes of the two hot-pressing rollers; the tension roller set comprises two oppositely arranged tension rollers, at least one of the two tension rollers can move along a direction vertical to the axis of the tension roller and parallel to the axes of the two tension rollers; the distance between the plane passing through the axes of the two tension rollers belonging to the same tension roller set and the plane passing through the axes of the two hot-pressing rollers is greater than or equal to the distance between two adjacent pieces of the piece material. The application further discloses a hot-pressing composite method for the composite strip material.

Description

Technical Field

[0001] This invention relates to a hot-pressing composite device, specifically a hot-pressing composite device and method for composite strips. Background Technology

[0002] There are two main methods for manufacturing batteries / capacitors: winding and stacking. While winding offers advantages such as speed and efficiency, it results in significant electrode bending after winding, leading to poor quality stability and low volumetric energy density in the produced batteries / capacitors. Stacking, on the other hand, involves layering electrodes to produce batteries / capacitors. The electrode dimensions can be precisely pre-processed, resulting in batteries / capacitors with regular shapes and good performance. However, the lower production efficiency of stacking compared to winding has severely hampered the development of this technology.

[0003] Currently, to improve stacking efficiency, most methods employ composite strips to combine the separator and electrode sheets of batteries / capacitors. For example, Chinese patent application CN112216858A discloses a stacked cell production system that cuts the anode sheet into sheet-like anode units and laminates them between two separator layers. Then, sheet-like cathode units are laminated at intervals on opposite sides of the separator layers, allowing for direct folding to obtain the battery or capacitor. Chinese patent application CN113871721A discloses a stacking machine and stacking method that uses a first cutting mechanism and a second cutting mechanism to cut the positive and negative electrode sheets into sheet-like materials. These materials are then laminated with separators, with sheet-like positive and negative electrode materials laminated to both sides of each separator layer, thus obtaining the battery structure.

[0004] All of the above-mentioned lamination methods require the use of thermal lamination equipment to improve the bonding performance of the sheet and strip materials in the composite strip. Thermal lamination equipment generally includes a heating device for heating the composite strip and a pressure roller group for pressing the composite strip. While this can improve the bonding strength between the sheet and strip materials to a certain extent, when the pressure roller group is located at both ends of the sheet, gaps exist between adjacent sheets. When the pressure roller group passes through these gaps, the strip cannot remain flat under the pressure of the pressure roller group, causing the strip to dent inward. This can also lead to deformation of the sheet ends, and may even crush or break the strip. In battery / capacitor production, the sheet is coated with active material, which can cause damage to the active material, ultimately affecting the production quality of the battery / capacitor. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a hot pressing composite device and hot pressing composite method for composite strips, which can avoid damage to the ends of the sheet material during the hot pressing composite process, and also prevent the strip material from being crushed or broken.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention first proposes a hot pressing composite device for composite strips, wherein the composite strip includes a strip material in the shape of a strip and sheet material in the shape of a sheet material composited on the strip material, and there is a gap between two adjacent sheets material; the hot pressing composite device includes a heating device for heating the composite strip and a hot rolling composite device for hot rolling the heated composite strip.

[0008] The hot roller pressing composite device includes a hot roller assembly, with tension roller assemblies on both sides of the hot roller assembly for balancing tension. Each hot roller assembly includes two opposing hot rollers, at least one of which is movable in a direction perpendicular to its axis and parallel to the axes of the two hot rollers. The tension roller assembly includes two opposing tension rollers; at least one of the two tension rollers is movable in a direction perpendicular to its axis and parallel to the axes of the two tension rollers.

[0009] The distance between the plane passing through the axes of two tension rollers belonging to the same tension roller group and the plane passing through the axes of two hot press rollers is greater than or equal to the distance between two adjacent sheets.

[0010] Furthermore, the heating device is a heating box.

[0011] Furthermore, the strip material is a battery separator or a strip material made of solid electrolyte.

[0012] Furthermore, it also includes a tension mechanism for maintaining a set tension on the composite strip within the heating device; the tension mechanism is located on the rear side of the heating device, and the hot roll forming device is located on the front side of the heating device.

[0013] Furthermore, it also includes a roll forming mechanism for bonding the composite strip.

[0014] Furthermore, the roller pressing composite mechanism includes a composite roller group and at least one unwinding roller group; let all the unwinding roller groups be sequentially the first-level unwinding roller group, the second-level unwinding roller group, ..., the i-th-level unwinding roller group, ..., the n-th-level unwinding roller group; where n is a positive integer; i is a positive integer, and i≤n;

[0015] The first-stage unwinding roller group includes a first electrode strip unwinding roller for unwinding the first electrode strip and a first film unwinding roller for unwinding the film strip; there are two first film unwinding rollers, and the film strips unwound by the two first film unwinding rollers are respectively bonded to both sides of the first electrode strip.

[0016] When i≥2, the i-th stage unwinding roller group includes an i-th electrode strip unwinding roller for unwinding the i-th electrode strip, an i-th film unwinding roller for unwinding the film strip, and an i-th cutting mechanism for cutting the i-th electrode strip into i-th electrode sheets; the i-th film unwinding roller and the i-th electrode strip unwinding roller are arranged in a one-to-one correspondence, the i-th electrode sheet is laminated on the film strip unwinding by the (i-1)-th film unwinding roller, and the film strip unwinding by the i-th film unwinding roller is laminated on the corresponding i-th electrode sheet.

[0017] Furthermore, when the strip is a battery strip, the 2i-1th electrode strip is a positive electrode strip and the 2ith electrode strip is a negative electrode strip; or, the 2i-1th electrode strip is a negative electrode strip and the 2ith electrode strip is a positive electrode strip.

[0018] When the strip is a capacitor strip, the 2i-1th electrode strip is the first capacitor electrode strip, and the 2ith electrode strip is the second capacitor electrode strip; or, the 2i-1th electrode strip is the second capacitor electrode strip, and the 2ith electrode strip is the first capacitor electrode strip.

[0019] Furthermore, the composite roller assembly includes a set of composite rollers; or,

[0020] Each composite roller group and each stage of the unwinding roller group are respectively provided with a set of composite rollers. The set of composite rollers provided corresponding to the i-th stage unwinding roller group is the i-th set of composite rollers, and the strip obtained by the i-th set of composite rollers is the i-th composite strip. The i-th set of composite rollers is used to combine the i-th electrode sheet cut by the i-th cutting mechanism and the film strip unwound by the i-th film unwinding roller together on the (i-1)-th composite strip to obtain the i-th composite strip; or...

[0021] The composite roller group and each stage of the unwinding roller group are respectively provided with two sets of composite rollers. The two sets of composite rollers provided corresponding to the i-th stage unwinding roller group are the i-th electrode composite roller and the i-th film composite roller. The strip obtained by the i-th electrode composite roller is the i-th composite strip I, and the strip obtained by the i-th film composite roller is the i-th composite strip II. The i-th electrode composite roller is used to composite the i-th electrode sheet obtained by the i-th cutting mechanism onto the i-1 composite strip II to obtain the i-th composite strip I. The i-th film composite roller is used to composite the film strip unwound by the i-th film unwinding roller onto the i-th composite strip I to obtain the i-th composite strip II.

[0022] Furthermore, the i-th electrode strip unwinding roller is configured as one or two. When the i-th electrode strip unwinding roller is configured as two, the i-th electrode strip unwound by the two i-th electrode strip unwinding rollers is located on both sides of the first electrode strip.

[0023] Furthermore, the first-stage unwinding roller group includes a first cutting mechanism for cutting the first electrode strip into the first electrode sheet.

[0024] Furthermore, an i-th encoder for measuring the cutting length of the i-th pole sheet is provided between the i-th pole sheet unwinding roller and the i-th cutting mechanism.

[0025] Furthermore, an i-th electrode strip feeding roller group is provided between the i-th encoder and the i-th cutting mechanism for driving the i-th electrode strip to feed.

[0026] Furthermore, an i-th pole strip buffer area is provided between the i-th encoder and the i-th pole strip unwinding roller.

[0027] The present invention also proposes a hot pressing composite method using the hot pressing composite device for composite strips as described above, wherein the composite strip is heated by a heating device, and the composite strip heated by the heating device is hot pressed composite by a hot pressing roller group.

[0028] When the rear end of a sheet of material is located behind the hot press roller assembly, and the distance between the rear end of the sheet and the hot press roller assembly is less than or equal to a set threshold, the hot press roller is driven to move, increasing the distance between the two hot press rollers and reducing the pressure applied by the hot press rollers to the composite strip. At the same time, the tension rollers of the two tension roller assemblies are driven to move, decreasing the distance between the two tension rollers belonging to the same tension roller assembly and increasing the pressure applied by the tension rollers to the composite strip, thereby reducing or even eliminating tension fluctuations caused by the reduction in pressure applied by the hot press roller assembly to the composite strip.

[0029] When the front end of the next sheet passes the hot press roller group and is located in front of the hot press roller group, and the distance between the front end of the sheet and the hot press roller group is greater than or equal to a set threshold, the hot press roller is driven to move, so that the distance between the two hot press rollers is reduced, and the pressure applied by the hot press roller to the composite strip is increased; at the same time, the tension rollers of the two tension roller groups are driven to move, so that the distance between the two tension rollers belonging to the same tension roller group is increased, and the pressure applied by the tension roller to the composite strip is reduced, so as to achieve hot roll pressing of the composite strip.

[0030] Furthermore, when the pressure applied to the composite strip by the hot press roller assembly decreases, the pressure applied to the composite strip by the hot press roller assembly decreases to zero or decreases to a set value.

[0031] Furthermore, when the pressure applied by the tension roller group to the composite strip decreases, the pressure applied by the tension roller group to the composite strip decreases to zero or to a set value.

[0032] Furthermore, the linear speed of the tension roller is equal to the feed speed of the composite strip.

[0033] Furthermore, as the pressure applied by the tension rollers to the composite strip increases, the pressure applied by the tension rollers to the composite material satisfies:

[0034]

[0035] in, This indicates the pressure applied to the composite material by the tension roller assembly; Indicates the tension of the composite strip; This represents the static friction coefficient between the tension roller and the composite belt.

[0036] The beneficial effects of this invention are as follows:

[0037] In the hot-pressing composite strip device of the present invention, the composite strip is heated by a heating device, and then hot-pressed by a hot-pressing roller assembly. Specifically, when the rear end of the previous sheet is located behind the hot-pressing roller assembly and the distance between the rear end of the sheet and the hot-pressing roller assembly is less than or equal to a set threshold, the hot-pressing rollers are driven to move, increasing the distance between the two hot-pressing rollers and reducing the pressure applied by the hot-pressing rollers to the composite strip. When the front end of the next sheet passes the hot-pressing roller assembly and is located in front of the hot-pressing roller assembly, and the distance between the front end of the sheet and the hot-pressing roller assembly is greater than or equal to a set threshold, the hot-pressing rollers are driven to move, decreasing the distance between the two hot-pressing rollers and increasing the pressure applied by the hot-pressing rollers to the composite strip. In this way, the hot-pressing roller assembly avoids the gap area between adjacent sheets, thereby avoiding damage to the ends of the sheets and preventing the strip from being crushed or broken.

[0038] However, when the pressure applied to the composite strip by the hot press rollers decreases or increases, it can cause instantaneous fluctuations in the tension of the composite strip. These instantaneous tension fluctuations are not only detrimental to production but may even break the strip. To avoid these instantaneous tension fluctuations, a tension roller group is set up for control. Specifically, when the pressure applied to the composite strip by the hot press rollers decreases, the pressure applied to the composite strip by the tension rollers increases; when the pressure applied to the composite strip by the hot press rollers increases, the pressure applied to the composite strip by the tension rollers decreases. In this way, the tension fluctuations caused by the decrease in the pressure applied to the composite strip by the hot press roller group can be reduced or even eliminated, and the hot press of the composite strip can also be achieved. Attached Figure Description

[0039] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration:

[0040] Figure 1 This is a schematic diagram illustrating the principle that existing pressure roller sets cause damage to the ends of sheet materials when passing through the gap area between two adjacent sheet materials.

[0041] Figure 2This is a schematic diagram of the structure of an embodiment of the hot-pressing composite device for composite strips of the present invention;

[0042] Figure 3 This is a schematic diagram of the structure of the first type of composite strip;

[0043] Figure 4 This is a schematic diagram of the structure of the second type of composite strip;

[0044] Figure 5 This is a schematic diagram of the structure of the third type of composite strip;

[0045] Figure 6 This is a schematic diagram of the first type of roll forming composite mechanism; specifically, it is a schematic diagram of the structure when the unwinding roller of the i-th electrode strip is set to be one.

[0046] Figure 7 This is a schematic diagram of the structure when the unwinding rollers of the i-th electrode strip are set to two in this embodiment;

[0047] Figure 8 This is a schematic diagram of the second type of roll-pressing composite mechanism; specifically, it is a schematic diagram of the structure when the unwinding roller of the i-th pole strip is set to be one.

[0048] Figure 9 This is a schematic diagram of the structure when the unwinding rollers of the i-th electrode strip are set to two in this embodiment;

[0049] Figure 10 This is a schematic diagram of the third type of roll-pressing composite mechanism; specifically, it is a schematic diagram of the structure when the unwinding roller of the i-th pole strip is set to be one.

[0050] Figure 11 This is a schematic diagram of the structure when the unwinding rollers of the i-th electrode strip are set to two in this embodiment.

[0051] Explanation of reference numerals in the attached figures:

[0052] 1-Strip material; 2-Sheet material; 3-Gap; 4-Composite strip material;

[0053] 11-Electrode strip unwinding roller; 12-Film unwinding roller; 13-Cutting mechanism; 14-Encoder; 15-Electrode strip feeding roller group; 16-Electrode strip buffer area; 17-Composite roller; 18-Electrode composite roller; 19-Film composite roller;

[0054] 21-Heating device; 22-Hot press roller group; 221-Hot press roller; 23-Tension roller group; 231-Tension roller; 24-Tension mechanism. Detailed Implementation

[0055] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0056] like Figure 2 The diagram shows a schematic representation of an embodiment of the hot-pressing composite device for composite strips according to the present invention. Specifically, the composite strip includes a strip-shaped material 1 and sheet-shaped materials 2 laminated on the strip 1, with a gap 3 between adjacent sheet materials 2. The hot-pressing composite device for composite strips in this embodiment includes a heating device 21 for heating the composite strip 4 and a hot-rolling composite device for hot-rolling the heated composite strip 4. The hot-rolling composite device in this embodiment includes a hot-rolling roller group 22, with tension roller groups 23 for balancing tension on both sides of the hot-rolling roller group 22. The hot-rolling roller group 22 includes two hot-rolling rollers 221 arranged opposite each other. At least one of the two hot-rolling rollers 221 can move in a direction perpendicular to its axis and parallel to the axes of the two hot-rolling rollers 221. By controlling the movement of the hot-rolling rollers 221, the pressure applied by the hot-rolling roller group 22 to the composite strip 4 can be adjusted. In this embodiment, only one of the two hot-pressing rollers 221 can move in a direction perpendicular to its axis and parallel to the axes of the two hot-pressing rollers 221. Of course, in other embodiments, both hot-pressing rollers 221 can be configured to move in a direction perpendicular to their axes and parallel to the axes of the two hot-pressing rollers 221, which will not be elaborated further. The tension roller group 23 includes two tension rollers 231 arranged opposite each other; at least one of the two tension rollers 231 can move in a direction perpendicular to its axis and parallel to the axes of the two tension rollers. By controlling the movement of the tension rollers 231, the pressure applied by the tension roller group 23 to the composite strip 4 can be adjusted. In this embodiment, only one of the two hot-pressing rollers 221 can move in a direction perpendicular to its axis and parallel to the axes of the two tension rollers 231. Of course, in other embodiments, both tension rollers 231 can be configured to move in a direction perpendicular to their axes and parallel to the axes of the two tension rollers 231, which will not be elaborated further.

[0057] Specifically, in this embodiment, the distance between the plane passing through the axes of the two tension rollers 231 belonging to the same tension roller group 23 and the plane passing through the axes of the two hot press rollers 221 is greater than or equal to the distance between two adjacent sheets 2.

[0058] Specifically, the heating device 21 in this embodiment uses a heating box, and the strip material in this embodiment uses a battery separator or a strip material made of solid electrolyte. The sheet material includes a current collector and an active material layer coated on the current collector.

[0059] Furthermore, the hot pressing composite device of this embodiment also includes a tension mechanism 24 for maintaining a set tension in the heating device 21 for the composite strip; the tension mechanism 24 is disposed on the rear side of the heating device, and the hot rolling composite device is disposed on the front side of the heating device.

[0060] The following describes in detail the specific implementation method of the hot pressing composite method for composite strips in this embodiment, using the hot pressing composite device for composite strips described above.

[0061] In this embodiment, the hot pressing method for composite strips involves heating the composite strip 4 using a heating device 21, and then hot pressing the composite strip 4, which has been heated by the heating device, is performed by a hot pressing roller assembly.

[0062] Specifically, when the rear end of a sheet 2 is located behind the hot press roller group 22, and the distance between the rear end of the sheet 2 and the hot press roller group 22 is less than or equal to a set threshold, the hot press roller is driven to move, increasing the distance between the two hot press rollers 221 and reducing the pressure applied by the hot press rollers 221 to the composite strip 4; at the same time, the tension rollers of the two tension roller groups 23 are driven to move, decreasing the distance between the two tension rollers 231 belonging to the same tension roller group 23 and increasing the pressure applied by the tension rollers 231 to the composite strip, so as to reduce or even eliminate the tension fluctuation caused by the reduction of the pressure applied by the hot press roller group to the composite strip;

[0063] When the front end of the next sheet 2 passes the hot press roller group 22 and is located in front of the hot press roller group 22, and the distance between the front end of the sheet 2 and the hot press roller group 22 is greater than or equal to a set threshold, the hot press roller 221 is driven to move, so that the distance between the two hot press rollers 221 is reduced, and the pressure applied by the hot press roller 221 to the composite strip is increased; at the same time, the tension rollers 231 of the two tension roller groups 23 are driven to move, so that the distance between the two tension rollers 231 belonging to the same tension roller group 23 is increased, and the pressure applied by the tension roller 231 to the composite strip 4 is reduced, so as to achieve hot roll pressing of the composite strip 4.

[0064] Furthermore, in this embodiment, when the pressure applied by the hot-pressing roller group 22 to the composite strip 4 decreases, the pressure applied by the hot-pressing roller group 22 to the composite strip 4 decreases to zero. Of course, in other embodiments, the pressure reduction setting of the hot-pressing roller group 22 to the composite strip 4 can also be set to a certain value. Under this set pressure, the sheet material will not be damaged, nor will the strip be broken or fractured. This set pressure value is set according to different sheet materials 2 and strip materials 1, and will not be elaborated further. Similarly, in this embodiment, when the pressure applied by the tension roller group 23 to the composite strip decreases, the pressure applied by the tension roller group 23 to the composite strip 4 decreases to zero. Of course, in other embodiments, the pressure reduction setting of the tension roller group 23 to the composite strip 4 can also be set to a certain value, so that the tension roller group 23 always maintains a certain pressure on the composite strip 4, achieving the technical purpose of rolling the composite strip 4. At the same time, under this pressure, the sheet material will not be damaged, nor will the strip be broken or fractured. This set pressure value is set according to different sheet materials 2 and strip materials 1, and will not be elaborated further. Specifically, during operation, the linear speed of the tension roller 231 can be set to be equal to the feeding speed of the composite strip 4, thereby avoiding sliding friction between the tension roller 231 and the composite strip 4 and preventing damage to the composite strip due to sliding friction.

[0065] Furthermore, when the pressure applied by the tension roller group 231 to the composite strip increases, the pressure applied by the tension roller group 231 to the composite material satisfies:

[0066]

[0067] in, This indicates the pressure applied to the composite material by the tension roller assembly; Indicates the tension of the composite strip; This represents the static friction coefficient between the tension roller and the composite belt.

[0068] That is, the tension of the composite strip 4 is always less than the static friction between the tension roller 231 and the composite strip 4, so as to ensure that there is no sliding friction between the tension roller 231 and the composite strip 4, and avoid damage to the composite strip due to sliding friction.

[0069] Furthermore, the hot-pressing composite device for the composite strip in this embodiment also includes a roll forming mechanism for forming the composite strip. The roll forming mechanism can be implemented in various ways, such as the roll forming mechanism for obtaining composite strip described in a laminated battery cell production system disclosed in Chinese patent application CN112216858A, where the structure of the composite strip 4 obtained by this roll forming mechanism is as follows: Figure 4 As shown; the composite equipment disclosed in Chinese Patent Publication No. CN213905427U, which describes a composite equipment and a lamination production line, has the following structure for the composite strip 4 obtained by the composite equipment: Figure 4 As shown; as disclosed in Chinese Patent Application No. CN113555595A, a hot lamination equipment and method for obtaining composite strips, the roll forming mechanism for obtaining composite strips is described, and the structure of the composite strip 4 obtained by the roll forming mechanism is as follows. Figure 4 As shown; as described in Chinese Patent Application Publication No. CN113871721A, a stacking machine and stacking method are used to obtain a composite strip 4. The structure of the composite strip 4 obtained by this stacking mechanism is as follows: Figure 5 As shown; further details will not be repeated.

[0070] The roller pressing composite mechanism in this embodiment has multiple structural forms.

[0071] The first type of roll forming composite mechanism

[0072] like Figure 6 As shown, the roll pressing composite mechanism includes a composite roll group and at least one unwinding roll group; let all the unwinding roll groups be sequentially named the first-level unwinding roll group, the second-level unwinding roll group, ..., the i-th-level unwinding roll group, ..., the n-th-level unwinding roll group; where n is a positive integer; i is a positive integer, and i≤n.

[0073] The first-stage unwinding roller group includes a first electrode strip unwinding roller for unwinding the first electrode strip and a first film unwinding roller for unwinding the film strip; there are two first film unwinding rollers, and the film strips unwound by the two first film unwinding rollers are respectively bonded to both sides of the first electrode strip 1.

[0074] When i≥2, the i-th stage unwinding roller group includes an i-th electrode strip unwinding roller for unwinding the i-th electrode strip, an i-th film unwinding roller for unwinding the film strip, and an i-th cutting mechanism for cutting the i-th electrode strip into i-th electrode sheets; the i-th film unwinding roller and the i-th electrode strip unwinding roller are arranged in a one-to-one correspondence, the i-th electrode sheet is laminated on the film strip unwinding by the (i-1)-th film unwinding roller, and the film strip unwinding by the i-th film unwinding roller is laminated on the corresponding i-th electrode sheet.

[0075] Specifically, the membrane material is a diaphragm or a solid electrolyte membrane.

[0076] Furthermore, when the strip is a battery strip, the 2i-1th electrode strip is the positive electrode strip, and the 2ith electrode strip is the negative electrode strip; or, the 2i-1th electrode strip is the negative electrode strip, and the 2ith electrode strip is the positive electrode strip. When the battery is a liquid battery, the film-like strip is a separator; when the battery is a solid-state battery, the film-like strip is a solid electrolyte membrane.

[0077] When the strip is a capacitor strip, the 2i-1th electrode strip is the first capacitor electrode strip, and the 2ith electrode strip is the second capacitor electrode strip; or, the 2i-1th electrode strip is the second capacitor electrode strip, and the 2ith electrode strip is the first capacitor electrode strip. Specifically, a separator or a solid electrolyte membrane can be disposed between the first capacitor electrode strip and the second capacitor electrode strip.

[0078] Furthermore, the composite roller group in this embodiment includes a set of composite rollers 17. Specifically, the i-th electrode strip unwinding roller is set to one or two rollers, such as... Figure 1 The diagram shows the structure when there is only one unwinding roller for the i-th electrode strip. When there are two unwinding rollers for the i-th electrode strip, the i-th electrode strip unwound by the two rollers is located on both sides of the first electrode strip, as shown below. Figure 7 As shown.

[0079] Furthermore, the hot pressing composite mechanism includes a heating box 21 for heating and a hot rolling composite roller group 22 for hot rolling the heated strip.

[0080] Furthermore, for some first electrode strips with excellent folding properties, the first electrode strip can be folded directly in subsequent production processes without cutting to produce batteries or capacitors. This can improve the tensile strength of the produced strip and facilitate subsequent production. Of course, for some first electrode strips with poor folding properties, especially those that would affect the quality of the final battery or capacitor product after folding, the first electrode strip needs to be sliced ​​first. In this case, the first-stage unwinding roller assembly includes a first cutting mechanism for cutting the first electrode strip into first electrode sheets. In this embodiment, the first-stage unwinding roller assembly includes a first cutting mechanism for cutting the first electrode strip into first electrode sheets.

[0081] Furthermore, an i-th encoder is provided between the i-th electrode strip unwinding roller and the i-th cutting mechanism to measure the cutting length of the i-th electrode strip, so as to accurately control the cutting length of the i-th electrode strip. An i-th electrode strip feeding roller assembly is provided between the i-th encoder and the i-th cutting mechanism to drive the i-th electrode strip feeding. An i-th electrode strip buffer area is provided between the i-th encoder and the i-th electrode strip unwinding roller.

[0082] In this embodiment, each unwinding roller assembly includes an electrode strip unwinding roller 11 for unwinding electrode strip 1, a film unwinding roller 12 for unwinding film strip 2, and a cutting mechanism 13 for cutting the electrode strip 1 into electrode sheets. An encoder 14 for measuring the cut length of the electrode sheet is provided between the electrode strip unwinding roller 11 and the electrode sheet cutting mechanism 13. An electrode strip feeding roller assembly 15 for driving the electrode strip 1 into the feed is provided between the encoder 14 and the electrode sheet cutting mechanism 13. An electrode strip buffer area 16 is provided between the encoder 14 and the electrode strip unwinding roller 11.

[0083] The second type of roll forming composite mechanism

[0084] like Figure 8 As shown, the roll pressing composite mechanism includes a composite roll group and at least one unwinding roll group; let all the unwinding roll groups be sequentially named the first-level unwinding roll group, the second-level unwinding roll group, ..., the i-th-level unwinding roll group, ..., the n-th-level unwinding roll group; where n is a positive integer; i is a positive integer, and i≤n.

[0085] The first-stage unwinding roller group includes a first electrode strip unwinding roller for unwinding the first electrode strip and a first film unwinding roller for unwinding the film strip; there are two first film unwinding rollers, and the film strips unwound by the two first film unwinding rollers are respectively bonded to both sides of the first electrode strip 1.

[0086] When i≥2, the i-th stage unwinding roller group includes an i-th electrode strip unwinding roller for unwinding the i-th electrode strip, an i-th film unwinding roller for unwinding the film strip, and an i-th cutting mechanism for cutting the i-th electrode strip into i-th electrode sheets; the i-th film unwinding roller and the i-th electrode strip unwinding roller are arranged in a one-to-one correspondence, the i-th electrode sheet is laminated on the film strip unwinding by the (i-1)-th film unwinding roller, and the film strip unwinding by the i-th film unwinding roller is laminated on the corresponding i-th electrode sheet.

[0087] Specifically, the membrane material is a diaphragm or a solid electrolyte membrane.

[0088] Specifically, the unwinding rollers for the i-th electrode strip are set to one or two, such as... Figure 3 The diagram shows the structure when there is only one unwinding roller for the i-th electrode strip. When there are two unwinding rollers for the i-th electrode strip, the i-th electrode strip unwound by the two rollers is located on both sides of the first electrode strip, as shown below. Figure 9 As shown.

[0089] In this embodiment, each composite roller group and each unwinding roller group are respectively provided with a set of composite rollers 17. The set of composite rollers provided with the i-th unwinding roller group is the i-th set of composite rollers, and the strip obtained by the i-th set of composite rollers is the i-th composite strip. The i-th set of composite rollers is used to combine the i-th electrode sheet cut by the i-th cutting mechanism and the film strip unwound by the i-th film unwinding roller together on the (i-1)-th composite strip to obtain the i-th composite strip.

[0090] Other specific implementation methods in this embodiment are the same as those in the first structural form of the roll forming composite mechanism, and will not be described in detail hereafter.

[0091] The third type of roll-pressing composite mechanism

[0092] like Figure 10As shown, the roll pressing composite mechanism includes a composite roll group and at least one unwinding roll group; let all the unwinding roll groups be sequentially named the first-level unwinding roll group, the second-level unwinding roll group, ..., the i-th-level unwinding roll group, ..., the n-th-level unwinding roll group; where n is a positive integer; i is a positive integer, and i≤n.

[0093] The first-stage unwinding roller group includes a first electrode strip unwinding roller for unwinding the first electrode strip and a first film unwinding roller for unwinding the film strip; there are two first film unwinding rollers, and the film strips unwound by the two first film unwinding rollers are respectively bonded to both sides of the first electrode strip 1.

[0094] When i≥2, the i-th stage unwinding roller group includes an i-th electrode strip unwinding roller for unwinding the i-th electrode strip, an i-th film unwinding roller for unwinding the film strip, and an i-th cutting mechanism for cutting the i-th electrode strip into i-th electrode sheets; the i-th film unwinding roller and the i-th electrode strip unwinding roller are arranged in a one-to-one correspondence, the i-th electrode sheet is laminated on the film strip unwinding by the (i-1)-th film unwinding roller, and the film strip unwinding by the i-th film unwinding roller is laminated on the corresponding i-th electrode sheet.

[0095] Specifically, the membrane material is a diaphragm or a solid electrolyte membrane.

[0096] Specifically, the unwinding rollers for the i-th electrode strip are set to one or two, such as... Figure 5 The diagram shows the structure when there is only one unwinding roller for the i-th electrode strip. When there are two unwinding rollers for the i-th electrode strip, the i-th electrode strip unwound by the two rollers is located on both sides of the first electrode strip, as shown below. Figure 11 As shown.

[0097] In this embodiment, each composite roller group and each stage of unwinding roller group are respectively provided with two sets of composite rollers, namely electrode composite roller 18 and film composite roller 19. The two sets of composite rollers corresponding to the i-th stage of unwinding roller group are the i-th set of electrode composite rollers and the i-th set of film composite rollers. The strip obtained by the i-th set of electrode composite rollers is the i-th composite strip I, and the strip obtained by the i-th set of film composite rollers is the i-th composite strip II. The i-th set of electrode composite rollers is used to composite the i-th electrode sheet obtained by the i-th cutting mechanism onto the i-1 composite strip II to obtain the i-th composite strip I, and the i-th set of film composite rollers is used to composite the film strip unwound by the i-th film unwinding roller onto the i-th composite strip I to obtain the i-th composite strip II.

[0098] Other specific implementation methods in this embodiment are the same as those in the first structural form of the roll forming composite mechanism, and will not be described in detail hereafter.

[0099] The above-described embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. A hot press bonding apparatus for a composite strip material, the composite strip material including a strip material in a strip shape and a sheet material in a sheet shape bonded to the strip material, with a gap between adjacent two of the sheet materials; characterized by: The hot-pressing composite device comprises a heating device for heating the composite strip and a hot-rolling composite device for hot-rolling the heated composite strip; The hot-pressing composite device comprises a hot-pressing roller group, and two tension roller groups are arranged on the two sides of the hot-pressing roller group respectively for balancing tension; the hot-pressing roller group comprises two oppositely arranged hot-pressing rollers, and at least one of the two hot-pressing rollers can move along a direction perpendicular to the axis of the hot-pressing roller and parallel to the axes of the two hot-pressing rollers; the tension roller group comprises two oppositely arranged tension rollers, and at least one of the two tension rollers can move along a direction perpendicular to the axis of the tension roller and parallel to the axes of the two tension rollers; The distance between the plane passing through the axes of the two tension rollers belonging to the same tension roller group and the plane passing through the axes of the two hot-pressing rollers is greater than or equal to the distance between two adjacent sheet materials; The composite strip is heated by the heating device, and the heated composite strip is hot-rolled by the hot-pressing roller group; When the trailing end of the current sheet material is located at the rear side of the hot-pressing roller group and the distance between the trailing end of the sheet material and the hot-pressing roller group is less than or equal to a set threshold, the hot-pressing roller is driven to move, so that the distance between the two hot-pressing rollers is increased, the pressure applied by the hot-pressing roller to the composite strip is reduced, and at the same time, the tension rollers of the two tension roller groups are driven to move, so that the distance between the two tension rollers belonging to the same tension roller group is reduced, the pressure applied by the tension roller to the composite strip is increased, so as to reduce or even eliminate the tension fluctuation caused by the reduction of the pressure applied by the hot-pressing roller group to the composite strip; When the leading end of the next sheet material passes through the hot-pressing roller group and is located at the front side of the hot-pressing roller group, and the distance between the leading end of the sheet material and the hot-pressing roller group is greater than or equal to a set threshold, the hot-pressing roller is driven to move, so that the distance between the two hot-pressing rollers is reduced, the pressure applied by the hot-pressing roller to the composite strip is increased, and at the same time, the tension rollers of the two tension roller groups are driven to move, so that the distance between the two tension rollers belonging to the same tension roller group is increased, the pressure applied by the tension roller to the composite strip is reduced, so as to realize the hot-rolling of the composite strip.

2. The hot press lamination apparatus for the composite tape of claim 1, wherein: The heating device adopts a heating box.

3. The apparatus according to claim 1, wherein: The sheet material adopts a battery separator or a strip-shaped material made of solid electrolyte.

4. The apparatus according to claim 1, wherein: A tension mechanism for keeping the composite strip in the heating device at a set tension is further included; the tension mechanism is arranged at the rear side of the heating device, and the hot-rolling composite device is arranged at the front side of the heating device.

5. The hot press lamination apparatus of the composite tape according to any one of claims 1 to 4, characterized by: A rolling composite mechanism for compositing the composite strip is further included.

6. The apparatus according to claim 5, wherein: The rolling composite mechanism comprises a composite roller group and at least one level of unwinding roller group; all the unwinding roller groups are sequentially the first level of unwinding roller group, the second level of unwinding roller group, …, the i-th level of unwinding roller group, …, the n-th level of unwinding roller group; wherein n is a positive integer; i is a positive integer, and i≤n; The first level of unwinding roller group comprises a first pole piece strip unwinding roller for unwinding the first pole piece strip and a first film unwinding roller for unwinding the film-shaped strip; the first film unwinding roller is provided with two, and the film-shaped strips unwound by the two first film unwinding rollers are respectively composed on the two sides of the first pole piece strip. When i≥2, the i-th stage unwinding roller group comprises an i-th pole piece strip unwinding roller for unwinding the i-th pole piece strip, an i-th film unwinding roller for unwinding the film-like strip, and an i-th cutting mechanism for cutting the i-th pole piece strip into i-th pole piece sheets; the i-th film unwinding roller is arranged in one-to-one correspondence with the i-th pole piece strip unwinding roller, and the i-th pole piece sheets are compounded on the film-like strip unwound by the i-1-th film unwinding roller, and the film-like strip unwound by the i-th film unwinding roller is compounded on the corresponding i-th pole piece sheets.

7. The hot-pressing compounding device of the composite strip according to claim 6, characterized in that: When the strip is a battery strip, the 2i-1-th pole piece strip is a positive electrode strip, and the 2i-th pole piece strip is a negative electrode strip; or, the 2i-1-th pole piece strip is a negative electrode strip, and the 2i-th pole piece strip is a positive electrode strip. When the strip is a capacitor strip, the 2i-1-th pole piece strip is a first capacitor electrode strip, and the 2i-th pole piece strip is a second capacitor electrode strip; or, the 2i-1-th pole piece strip is a second capacitor electrode strip, and the 2i-th pole piece strip is a first capacitor electrode strip.

8. The hot-pressing compounding device of the composite strip according to claim 6, characterized in that: The compounding roller group comprises a group of compounding rollers; or, The compounding roller group is respectively provided with a group of compounding rollers corresponding to each stage of the unwinding roller group, and the group of compounding rollers corresponding to the i-th stage unwinding roller group is the i-th group of compounding rollers, and the strip compounded by the i-th group of compounding rollers is the i-th composite strip; The i-th group of compounding rollers is used for compounding the i-th pole piece sheets cut by the i-th cutting mechanism and the film-like strip unwound by the i-th film unwinding roller together on the i-1-th composite strip to obtain the i-th composite strip; or, The compounding roller group is respectively provided with two groups of compounding rollers corresponding to each stage of the unwinding roller group, and the two groups of compounding rollers corresponding to the i-th stage unwinding roller group are the i-th group of pole piece compounding rollers and the i-th group of film compounding rollers, respectively, the strip compounded by the i-th group of pole piece compounding rollers is the i-th composite strip I, and the strip compounded by the i-th group of film compounding rollers is the i-th composite strip II; the i-th group of pole piece compounding rollers is used for compounding the i-th pole piece sheets cut by the i-th cutting mechanism on the i-1-th composite strip II to obtain the i-th composite strip I, and the i-th group of film compounding rollers is used for compounding the film-like strip unwound by the i-th film unwinding roller on the i-th composite strip I to obtain the i-th composite strip II. The i-th pole piece strip unwinding roller is provided as one or two, and when the i-th pole piece strip unwinding roller is provided as two, the i-th pole piece strips unwound by the two i-th pole piece strip unwinding rollers are respectively located on the two sides of the 1st pole piece strip.

9. The hot press lamination apparatus of the composite tape according to claim 6, characterized by: The 1st stage unwinding roller group comprises a 1st cutting mechanism for cutting the 1st pole piece strip into 1st pole piece sheets.

10. The hot press lamination apparatus of the composite tape according to claim 6, characterized by: An i-th encoder for measuring the cutting length of the i-th pole piece sheets is arranged between the i-th pole piece strip unwinding roller and the i-th cutting mechanism.

11. The hot press lamination apparatus of the composite tape according to claim 6, characterized by: An i-th pole piece strip feeding roller group for driving the feeding of the i-th pole piece strip is arranged between the i-th encoder and the i-th cutting mechanism.

12. The hot press lamination apparatus of the composite tape according to claim 11, characterized by: ​ 13. The hot press lamination apparatus of the composite tape according to claim 12, characterized by: The i-th pole piece strip buffer area is arranged between the i-th pole piece strip and the i-th pole piece strip unwinding roller.

14. A hot-pressing method of a hot-pressing device using the composite strip according to any one of claims 1-13, characterized in that: The composite strip is heated by a heating device, and the composite strip heated by the heating device is hot-pressed by the hot-pressing roller set; When the trailing end of the previous piece of sheet material is located at the rear side of the hot-pressing roller set and the distance between the trailing end of the sheet material and the hot-pressing roller set is less than or equal to a set threshold, the hot-pressing roller is driven to move, so that the distance between the two hot-pressing rollers is increased, the pressure applied by the hot-pressing roller to the composite strip is reduced, and the tension rollers of the two tension roller sets are driven to move, so that the distance between the two tension rollers belonging to the same tension roller set is reduced, the pressure applied by the tension roller to the composite strip is increased, and the tension fluctuation caused by the reduced pressure applied by the hot-pressing roller set to the composite strip is reduced or even eliminated; When the leading end of the next piece of sheet material passes through the hot-pressing roller set and is located at the front side of the hot-pressing roller set, and the distance between the leading end of the sheet material and the hot-pressing roller set is greater than or equal to a set threshold, the hot-pressing roller is driven to move, so that the distance between the two hot-pressing rollers is reduced, the pressure applied by the hot-pressing roller to the composite strip is increased, and the tension rollers of the two tension roller sets are driven to move, so that the distance between the two tension rollers belonging to the same tension roller set is increased, the pressure applied by the tension roller to the composite strip is reduced, and the hot-roller pressing of the composite strip is realized.

15. The method of claim 14, wherein: When the pressure applied by the hot-pressing roller set to the composite strip is reduced, the pressure applied by the hot-pressing roller set to the composite strip is reduced to zero or a set value.

16. The method of claim 14, wherein: When the pressure applied by the tension roller set to the composite strip is reduced, the pressure applied by the tension roller set to the composite strip is reduced to zero or a set value.

17. The method of claim 14, wherein: The linear speed of the tension roller is equal to the feeding speed of the composite strip.

18. The method of claim 14, wherein: When the pressure applied by the tension roller set to the composite strip is increased, the pressure applied by the tension roller set to the composite material satisfies: wherein, represents the pressure exerted by the set of tension rolls on the composite material; represents the tension of the composite strip; represents the static friction coefficient between the tension rolls and the composite strip.

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