Preparation equipment and preparation method of electrode plate and electrode plate

Abstract

The invention discloses preparation equipment and a preparation method of an electrode plate and the electrode plate. The preparation equipment of the electrode plate comprises a diaphragm feeding mechanism used for outputting a diaphragm; the current collector feeding mechanism is used for outputting a current collector; and the compounding mechanism is arranged on the downstream side of the membrane feeding mechanism and the current collector feeding mechanism in the feeding direction, and the compounding mechanism is used for receiving the membrane and the current collector and compounding the membrane and the current collector into the electrode plate. According to the preparation equipment of the electrode plate, the diaphragm feeding mechanism periodically feeds materials to the compounding mechanism, and meanwhile, the current collector feeding mechanism continuously feeds the materials to the compounding mechanism, so that diaphragms on the electrode plate processed by the compounding mechanism are periodically interrupted, and the design requirement of a battery cell is met.

Description

Technical Field

[0001] The present invention relates to the field of battery processing equipment, and in particular to an electrode sheet preparation device, a preparation method and an electrode sheet. Background Art

[0002] The preparation process of dry electrode sheets generally includes the following steps: material mixing, fiberization, film formation and compounding. Among them, the film formation and compounding sections are usually continuous belt conveying processes, and the dressing layers on the prepared electrode sheets are continuous. This continuous dressing layer design is effective in most applications, but under certain specific battery cell structure requirements, the continuous dressing layer may not be ideal. For example, in some special battery cell designs, the dressing layer on the electrode sheet is required to have periodic discontinuities to optimize the performance and structure of the battery.

[0003] Currently, there is a lack of effective solutions on the market for the preparation of dry-process electrode sheets with periodically discontinuous dressing layers. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide an electrode sheet preparation device, a preparation method and an electrode sheet. The electrode sheet preparation device periodically feeds the composite mechanism through a membrane feeding mechanism, so that the membrane on the electrode sheet is periodically discontinuous, thereby meeting the design requirements.

[0005] In a first aspect, an embodiment of the present invention provides an electrode sheet preparation device, wherein the electrode sheet comprises a current collector and a membrane, and a plurality of the membrane sheets are arranged on the surface of the current collector at intervals along the extension direction of the current collector, and the preparation device comprises: a membrane sheet feeding mechanism for outputting the membrane sheet; a current collector feeding mechanism for outputting the current collector; and a compound mechanism, which is arranged on the downstream side of the membrane sheet feeding mechanism and the current collector feeding mechanism in the feeding direction, and the compound mechanism is used to receive the membrane sheet and the current collector, and to compound the membrane sheet and the current collector into the electrode sheet.

[0006] In the electrode sheet preparation equipment of the present invention, the membrane feeding mechanism periodically feeds material to the composite mechanism, and the current collector feeding mechanism continuously feeds material to the composite mechanism, so that the membrane on the electrode sheet processed by the composite mechanism is periodically discontinuous, thereby meeting the design requirements of the battery cell.

[0007] In some embodiments, the film feeding mechanism includes a film unwinding device and a cutting device.

[0008] According to some embodiments of the present invention, the film feeding mechanism also includes: a first laminating roller and a second laminating roller, the first laminating roller and the second laminating roller are arranged sequentially along the conveying direction of the film, the film output by the film unwinding roller is rolled by the first laminating roller and the second laminating roller and conveyed to the composite mechanism, and the cutting device is arranged on one side of the second laminating roller.

[0009] According to some embodiments of the present invention, the composite mechanism includes a first composite roller and a second composite roller, the first composite roller is arranged on the downstream side of the membrane unwinding device to receive the membrane, and the second composite roller is arranged on the downstream side of the current collector unwinding roller to receive the current collector.

[0010] According to some embodiments of the present invention, the first composite roller is constructed to be movable between a first position and a second position relative to the second composite roller, wherein in the first position, the first composite roller receives the membrane sheet, and in the second position, the first composite roller and the second composite roller roll-combine the membrane sheet and the current collector.

[0011] According to some embodiments of the present invention, the composite mechanism further includes a displacement drive device, and the displacement drive device is drivingly connected to the first composite roller.

[0012] According to some embodiments of the present invention, the first composite roller includes: a first sub-roller and a second sub-roller, wherein the first sub-roller and the second sub-roller are both suitable for moving between the first position and the second position, and when one of the first sub-roller and the second sub-roller is in the first position, the other is in the second position.

[0013] In some embodiments, there are two membrane sheet feeding mechanisms, and the membrane sheets outputted by the two membrane sheet feeding mechanisms are respectively outputted to the first composite roller and the second composite roller, and the two membrane sheets are respectively located on both sides of the current collector.

[0014] According to some embodiments of the present invention, it further includes: a winding roller, which is arranged on the downstream side of the composite mechanism, and is used to wind up the electrode sheet output by the composite mechanism.

[0015] According to some embodiments of the present invention, the winding roller is configured to rotate synchronously with the second compounding roller of the compounding mechanism.

[0016] In a second aspect, an embodiment of the present invention further provides a method for preparing an electrode sheet, which is applied to the above-mentioned electrode sheet preparation device, comprising the following steps:

[0017] Controlling the current collector feeding mechanism to transport the current collector to the composite mechanism;

[0018] Controlling the film feeding mechanism to deliver the film to the compound mechanism according to a preset cycle;

[0019] The composite mechanism is controlled to perform roll-compression composite on the membrane and the current collector.

[0020] In the electrode sheet preparation method of the present invention, since the current collector feeding mechanism continuously feeds the current collector to the composite mechanism, and the membrane feeding mechanism feeds the membrane to the composite mechanism according to a preset cycle, the membrane on the electrode sheet composited by the composite mechanism must be periodically intermittent to meet the design requirements of the battery cell.

[0021] In some embodiments, the controlling film feeding mechanism to deliver the film to the compounding mechanism according to a preset cycle includes:

[0022] Controlling the film unwinding roller to convey the film to the second laminating roller via the first laminating roller;

[0023] Controlling the cutting device to cut the film into a preset shape at the second laminating roller;

[0024] The second laminating roller is controlled to convey the film sheet having a preset shape to the laminating mechanism.

[0025] In some embodiments, controlling the composite mechanism to roll-combine the membrane and the current collector comprises:

[0026] Controlling the first composite roller to move to a second position, and performing roll-combination of the current collector and the membrane with the first composite roller;

[0027] The first composite roller is controlled to retract to the first position, and the current collector feeding mechanism and the second composite roller are controlled to continue to operate until the membrane moves to a preset position along with the current collector.

[0028] In a third aspect, an embodiment of the present invention further provides an electrode sheet, which is made by the above-mentioned electrode sheet preparation equipment and / or the above-mentioned electrode sheet preparation method.

[0029] The electrode sheet of the present invention is manufactured by using the above-mentioned electrode sheet manufacturing equipment or the above-mentioned electrode sheet manufacturing method. The membrane on the electrode sheet can be periodically interrupted to meet the design requirements of the battery cell, and the processing is convenient.

[0030] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0032] Figure 1 is a schematic structural diagram of an electrode sheet preparation device according to an embodiment of the present invention;

[0033] Figure 2 This is one of the structural schematic diagrams of an electrode sheet according to an embodiment of the present invention;

[0034] Figure 3 This is a second structural schematic diagram of an electrode sheet according to an embodiment of the present invention;

[0035] Figure 4 is a schematic structural diagram of an electrode sheet according to another embodiment of the present invention;

[0036] Figure 5 is a structural schematic diagram of an electrode sheet preparation device according to another embodiment of the present invention;

[0037] Figure 6 is a schematic structural diagram of an electrode sheet preparation device according to yet another embodiment of the present invention;

[0038] Figure 7 It is a flow chart of the method for preparing an electrode sheet according to an embodiment of the present invention.

[0039] Reference numerals:

[0040] 100- Preparation equipment;

[0041] 110-film feeding mechanism; 111-film unwinding device; 112-cutting device; 113-first laminating roller; 114-second laminating roller;

[0042] 120 - current collector feeding mechanism;

[0043] 130-combination mechanism; 131-first composite roller; 1311-first sub-roller; 1312-second sub-roller; 132-second composite roller; 1321-third sub-roller; 1322-fourth sub-roller;

[0044] 140-reeling roller;

[0045] 200-electrode sheet;

[0046] 210 - current collector; 220 - membrane. DETAILED DESCRIPTION

[0047] The embodiments of the present invention are described in detail below. Examples of the following embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0048] Reference below Figures 1 to 7 , describing an electrode sheet preparation device 100 according to an embodiment of the first aspect of the present invention, the preparation device 100 is used to prepare an electrode sheet 200.

[0049] The electrode sheet 200 may include a current collector 210 and a membrane 220. The current collector 210 is used to carry the membrane 220. The membrane 220 includes an active material, a conductive agent, a solid electrolyte, and a binder. The membrane 220 is used to provide the battery with electrochemical properties and conductivity and enhance the mechanical strength of the electrode sheet 200. The solid membrane 220 is combined with the current collector 210 through the electrode sheet preparation device 100 to form the electrode sheet 200, and a plurality of membranes 220 are arranged on the surface of the current collector 210 at intervals along the extension direction of the current collector 210. Among them, the membrane 220 can be arranged only on one side of the current collector 210 (see Figure 2 and Figure 3 ), can also be disposed on both sides of the current collector 210 (see Figure 6 ).

[0050] refer to Figure 1 , Figure 4 and Figure 5 The preparation device 100 may include a membrane feeding mechanism 110 , a current collector feeding mechanism 120 and a compounding mechanism 130 .

[0051] The membrane feeding mechanism 110 is used to output the membrane 220 during the preparation of the electrode sheet 200, and the current collector feeding mechanism 120 is used to output the current collector 210 during the preparation of the electrode sheet 200, so that the membrane 220 and the current collector 210 can be combined into one in the subsequent steps. The current collector feeding mechanism 120 can be a current collector unwinding roller, and the current collector 210 is wound on the current collector unwinding roller.

[0052] The compounding mechanism 130 is arranged on the downstream side of the membrane feeding mechanism 110 and the current collector feeding mechanism 120 in the feeding direction. The compounding mechanism 130 is used to receive the membrane 220 from the membrane feeding mechanism 110 and the current collector 210 from the current collector feeding mechanism 120, and compound the membrane 220 and the current collector 210 into the electrode sheet 200, wherein the method of compounding the membrane 220 and the current collector 210 by the compounding mechanism 130 may include but is not limited to hot pressing compounding, rolling compounding, lamination compounding or laser compounding.

[0053] The film feeding mechanism 110 is configured to provide the film 220 to the composite mechanism 130 according to a preset cycle, that is, the film feeding mechanism 110 delivers the film 220 of a preset size to the composite mechanism 130 every preset cycle. For example, the preset cycle may include a feeding period and a stop period. During the feeding period, the film feeding mechanism 110 outputs and provides the film 220 to the composite mechanism 130, and during the stop period, the film feeding mechanism 110 stops operating. It should be noted that during the entire preset cycle, the current collector feeding mechanism 120 continues to deliver the current collector 210 to the composite mechanism 130, so that the current collector 210 passing through the composite mechanism 130 during the stop period does not have a film 220. After the production is carried out for multiple preset cycles, the film 220 on the current collector 210 of the produced electrode sheet 200 is periodically spaced, and the distance of the spacing is the discharge length of the current collector 210 during the stop period.

[0054] In the electrode sheet preparation equipment 100 of the present invention, the membrane feeding mechanism 110 periodically feeds material to the composite mechanism 130, and the current collector feeding mechanism 120 continuously feeds material to the composite mechanism 130, so that the membrane on the electrode sheet 200 processed by the composite mechanism 130 is periodically discontinuous, thereby meeting the design requirements of the battery cell.

[0055] refer to Figure 1 and Figure 4 In some embodiments, the film feeding mechanism 110 may include a film unwinding device 111 and a cutting device 112. The film unwinding device 111 is configured to unwind the film 220 according to a preset cycle, that is, to feed the composite mechanism 130 during the feeding period, and to stop the film unwinding device 111 during the stop period. The cutting device 112 is used to cut the film 220 into a preset shape. In other words, within a preset cycle, the film unwinding device 111 feeds the composite mechanism 130 during the feeding period, outputs a certain length of film 220 to the cutting device 112, and then the film unwinding device 111 stops running during the stop period, and the cutting device 112 cuts the film 220, so that the film 220 delivered to the composite mechanism 130 in each preset cycle has the same size, thereby ensuring the consistency of the produced electrode sheet 200.

[0056] Optionally, the membrane unwinding device 111 may include a membrane unwinding roller, on which the finished membrane 220 is wound to supply the compounding mechanism 130. Alternatively, the membrane unwinding device 111 may also be a multi-roller film forming device, which may be one of the conventional dry electrode film forming devices, and the manufactured membrane 220 is directly output to the compounding mechanism 130 for compounding.

[0057] The cutting device 112 can be a cutting blade, and the cutting method of the cutting blade can be radially moving toward the supporting structure of the film 220 (such as the second bonding roller 114 described later) to directly cut the film 220, or axially moving along the supporting structure of the film 220 (such as the second bonding roller 114 described later) to cut the film 220 into equal length parts.

[0058] Continue to refer Figure 1 and Figure 4 According to some embodiments of the present invention, the film feeding mechanism 110 may further include a first laminating roller 113 and a second laminating roller 114, the first laminating roller 113 and the second laminating roller 114 are sequentially arranged along the conveying direction of the film 220, and the film 220 output by the film unwinding roller is sequentially rolled by the first laminating roller 113 and the second laminating roller 114 and conveyed to the compounding mechanism 130. The cutting device 112 is arranged on one side of the second laminating roller 114, and the cutting device 112 is configured to cut the film 220 of a preset length on the second laminating roller 114. In this way, when the film unwinding device 111 conveys the film 220 to the composite mechanism 130, after the cutting device 112 cuts the film 220 on the second laminating roller 114, the film unwinding device 111 and the film 220 on the first laminating roller 113 are still in a tensioned state, avoiding the film 220 from being separated from the first laminating roller 113 and the second laminating roller 114 after cutting, resulting in processing interruption, so that the processing can continue, thereby improving the continuity of the processing process.

[0059] According to some embodiments of the present invention, the first laminating roller 113 and the second laminating roller 114 both rotate according to a preset cycle. That is, the operation cycle of the first laminating roller 113 and the second laminating roller 114 matches the film feeding mechanism 110. During the feeding period of the preset cycle, the first laminating roller 113 and the second laminating roller 114 rotate. At this time, the film 220 cut out of the last preset cycle on the second laminating roller 114 is transported to the composite mechanism 130, and the first laminating roller 113 transports continuous film 220 to the second laminating roller 114. During the stop period, the cutting mechanism cuts the film 220. The above process is repeated in multiple preset cycles, so that the film feeding mechanism 110 can output equal-length film 220 to the composite mechanism 130, and ensure that the spacing between the film 220 on the current collector 210 is the same, thereby improving the consistency of the produced electrode sheet 200.

[0060] Continue to refer Figure 1 and Figure 4According to some embodiments of the present invention, the composite mechanism 130 may include a first composite roller 131 and a second composite roller 132, wherein the first composite roller 131 is disposed at the downstream side of the film unwinding device 111 to receive the film 220, and the second composite roller 132 is disposed at the downstream side of the unwinding roller of the current collector 210 to receive the current collector 210, and the first composite roller 131 and the second composite roller 132 are configured to roll-combine the film 220 and the current collector 210. The first composite roller 131 and the second composite roller 132 may roll-combine the film 220 and the current collector 210 in a fixed roll gap manner, that is, the gap between the first composite roller 131 and the second composite roller 132 remains unchanged, so that the film 220 and the current collector 210 pass through the roll gap between the first composite roller 131 and the second composite roller 132 to complete the composite. Alternatively, the first composite roller 131 and the second composite roller 132 may roll-combine the membrane 220 and the current collector 210 in a variable roll gap manner, wherein one of the first composite roller 131 and the second composite roller 132 may move relative to the other, and when the membrane 220 and the current collector 210 pass through the roll gap between the first composite roller 131 and the second composite roller 132, the membrane 220 and the current collector 210 are composited to form the electrode sheet 200. The composite mechanism 130 has a simple structure and convenient composite processing, which is conducive to reducing equipment costs.

[0061] Further, the first composite roller 131 is configured to be movable between a first position and a second position relative to the second composite roller 132, wherein in the first position, the first composite roller 131 receives the membrane sheet 220, and in the second position, the first composite roller 131 and the second composite roller 132 perform roll-compression composite on the membrane sheet 220 and the current collector 210. Thus, when the first composite roller 131 is in the first position, the first composite roller 131 receives the membrane sheet 220, so that the membrane sheet 220 is placed on the first composite roller 131 in a flat posture, thereby ensuring that the cut membrane sheet 220 is correctly aligned with the current collector 210, improving the composite accuracy, and thus improving the quality of the produced electrode sheet 200.

[0062] According to some embodiments of the present invention, the composite mechanism 130 may further include a displacement drive device, which is transmission-connected to the first composite roller 131 to drive the first composite roller 131 to move between the first position and the second position. The displacement drive device may be a stepper motor, which is connected to the first composite roller 131 via a lead screw, or the displacement drive device may be a servo motor, which is connected to the first composite roller 131 via a ball screw. In this way, the first composite roller 131 can be accurately moved from the first position to the second position, thereby improving the processing accuracy of the preparation device 100 and improving the product quality.

[0063] refer to Figure 4According to some other embodiments of the present invention, the first composite roller 131 may include a first sub-roller 1311 and a second sub-roller 1312, both of which are suitable for moving between a first position and a second position, and when one of the first sub-roller 1311 and the second sub-roller 1312 is in the first position, the other is in the second position, for example, the first sub-roller 1311 is in the first position, the second sub-roller 1312 is in the second position, or the second sub-roller 1312 is in the first position, and the first sub-roller 1311 is in the second position. When one of them moves to the first position, the other moves to the second position, for example, the first sub-roller 1311 in the first position moves to the second position, and at this time, the second sub-roller 1312 in the second position moves to the first position. In this way, in a preset cycle, when one of the first sub-roller 1311 and the second sub-roller 1312 conveys the film 220 to the second composite roller 132, the other moves to the first position to receive the cut film 220, and the processing efficiency is higher. Optionally, since the first sub-roller 1311 and the second sub-roller 1312 can alternately receive and convey the film 220 , the film unwinding roller can unwind the film non-stop, which can greatly improve the preparation efficiency of the electrode sheet 200 .

[0064] Optionally, in other embodiments, the first composite roller 131 may further include more sub-rollers, which is not limited in this embodiment.

[0065] refer to Figure 5 and Figure 6 In some embodiments, there may be two film sheet feeding mechanisms 110, and the film sheets 220 output by the two film sheet feeding mechanisms 110 are respectively output to the first composite roller 131 and the second composite roller 132, and the two film sheets 220 are respectively located on both sides of the current collector 210, so as to form a double-sided electrode sheet to adapt to the application occasions requiring double-sided electrode sheets. In addition, the preset cycles of the two film sheet feeding mechanisms 110 are the same, so that the intervals between the film sheets 220 on both sides of the current collector 210 are the same, thereby improving the consistency of the product.

[0066] Understandably, continue to refer to Figure 5 When the film feeding mechanism 110 is provided with two, the second composite roller 132 at this time may include a third sub-roller 1321 and a fourth sub-roller 1322, and the third sub-roller 1321 and the fourth sub-roller 1322 are both adapted to move between the first position and the second position, and when one of the third sub-roller 1321 and the fourth sub-roller 1322 is in the first position, the other is in the second position. The operation state of the third sub-roller 1321 and the fourth sub-roller 1322 can refer to the operation mode of the first sub-roller 1311 and the second sub-roller 1312, and will not be described in detail here.

[0067] refer to Figure 1 , Figure 4 and Figure 5 In some embodiments, the preparation device 100 may further include a winding roller 140, which is disposed at the downstream side of the composite mechanism 130, and the winding roller 140 winds up the electrode sheet 200 output by the composite mechanism 130. In this way, the produced electrode sheet 200 is stored for easy transportation and transfer.

[0068] Furthermore, the winding roller 140 is configured to rotate synchronously with the second composite roller 132 of the composite mechanism 130, so that the material collection speed of the winding roller 140 matches the speed of the composite processing output electrode sheet 200 product of the second composite roller 132, thereby improving the collection effect.

[0069] Optionally, the preparation equipment 100 of the present invention may include an electrode sheet detection system, which may include at least one of a visual recognition unit, a thickness monitoring unit, a surface density monitoring unit and a tension control unit, so as to monitor the quality parameters of the diaphragm 220 output by the diaphragm feeding mechanism 110, the collector 210 output by the collector feeding mechanism 120 and the electrode sheet 200 processed by the composite mechanism 130. The quality parameters may include: whether the electrode sheet has cracks, wrinkles, thickness, surface density and tension of the electrode sheet, etc.

[0070] For example, the roller pressure between the first composite roller and the second composite roller can be controlled according to the result of the electrode sheet detection system, so as to adjust the quality parameters of the prepared electrode sheet and improve the product qualification rate.

[0071] refer to Figure 7 In a second aspect, an embodiment of the present invention further provides an electrode sheet preparation method, which is applied to the above-mentioned electrode sheet preparation device 100 to prepare an electrode sheet 200. The electrode sheet 200 preparation method may include the following steps:

[0072] S101: Control the current collector feeding mechanism 120 to transport the current collector 210 to the composite mechanism 130;

[0073] Specifically, the current collector feeding mechanism 120 may be a roll for unwinding the current collector 210 , and the current collector feeding mechanism 120 may unwind the current collector 210 continuously or according to a preset cycle.

[0074] S102: Control the film feeding mechanism 110 to deliver the film 220 to the compounding mechanism 130 according to a preset cycle;

[0075] S103 : Controlling the composite mechanism 130 to roll-combine the membrane 220 and the current collector 210 .

[0076] In the electrode sheet preparation method of the present invention, since the current collector feeding mechanism 120 continuously transports the current collector 210 to the composite mechanism 130, and the membrane feeding mechanism 110 transports the membrane 220 to the composite mechanism 130 according to a preset period, the continuous current collector 210 is composited with the membrane 220 periodically transported to the composite mechanism 130, and the membrane on the processed electrode sheet 200 is periodically intermittent, thereby meeting the design requirements of the battery cell.

[0077] In some embodiments, controlling the film feeding mechanism 110 to deliver the film 220 to the compounding mechanism 130 according to a preset cycle may include:

[0078] S1021: Control the film unwinding roller to transport the film 220 to the second laminating roller 114 via the first laminating roller 113;

[0079] It can be understood that the membrane 220 can first pass through the side of the first laminating roller 113 facing away from the second laminating roller 114, then rotate with the first laminating roller 113 and pass through the gap between the first laminating roller 113 and the second laminating roller 114 to reach the second laminating roller 114, and then move with the second laminating roller 114 to the side facing away from the first laminating roller 113. When passing through the gap between the first laminating roller 113 and the second laminating roller 114, the first laminating roller 113 and the second laminating roller 114 can cooperate with each other to further flatten the membrane 220, which is beneficial to improve the composite effect of the membrane 220 and the collector 210 in the subsequent steps.

[0080] S1022: Control the cutting device 112 to cut the film 220 into a preset shape at the second laminating roller 114;

[0081] The preset shape here may mean that the film 220 is cut to a preset length, preset width, preset shape, etc.

[0082] S1023 : controlling the second laminating roller 114 to convey the film sheet 220 having a preset shape to the laminating mechanism 130 .

[0083] In this embodiment, the preset cycle may include a feeding period and a stop period. During the feeding period, the film feeding mechanism 110 outputs and provides the film 220 to the compounding mechanism 130. During the stop period, the film feeding mechanism 110 stops operating. That is, during the feeding period, the film unwinding roller conveys the film 220 to the second laminating roller 114 via the first laminating roller 113. When the stop period comes, the film unwinding roller is controlled to stop, and the cutting device 112 cuts the film 220 into a preset shape at the second laminating roller 114. When the next preset cycle is entered, during the feeding period, the film unwinding roller conveys the film 220 to the second laminating roller 114 via the first laminating roller 113. At this time, the cut film 220 on the second laminating roller 114 is conveyed to the compounding mechanism 130, and a new section of the film 220 is conveyed to the second laminating roller 114.

[0084] In some embodiments, controlling the compounding mechanism 130 to roll-compound the membrane 220 and the current collector 210 may include:

[0085] S1031: Control the first composite roller 131 to move to the second position, and perform rolling composite of the current collector 210 and the membrane 220 with the first composite roller 131;

[0086] S1032: Control the first composite roller 131 to retract to the first position, and control the current collector feeding mechanism 120 and the second composite roller 132 to continue to operate until the membrane 220 moves to a preset position along with the current collector 210 .

[0087] In this embodiment, within a preset cycle, the action of the composite mechanism 130 to composite the membrane 220 and the current collector 210 can be as follows: the first composite roller 131 receives the membrane 220 output from the second bonding roller 114 at a first position, and transports it to a second position, and under the rolling action of the first composite roller 131 and the second composite roller 132, the membrane 220 is composited with the continuous current collector 210 to form an electrode sheet 200.

[0088] In a third aspect, an embodiment of the present invention further provides an electrode sheet 200. The electrode sheet 200 can be made by the above-mentioned electrode sheet preparation device 100, or the electrode sheet 200 can also be made by the above-mentioned electrode sheet preparation method.

[0089] The electrode sheet 200 of the present invention is manufactured by using the above-mentioned electrode sheet manufacturing device 100 or the above-mentioned electrode sheet manufacturing method. The membrane 220 on the electrode sheet 200 can be periodically discontinuous to meet the design requirements of the battery cell, and the processing is convenient.

[0090] Optionally, the membrane 220 may include: an active material, a conductive agent, a solid electrolyte, and a binder.

[0091] The active material may be a positive electrode active material, and the positive electrode active material includes lithium nickel cobalt aluminum oxide, lithium nickel cobalt manganese oxide, LiFePO 4 、LiFe 0.2 Mn 0.8 PO 4 、LiMn 2 O 4 、LiCoPO 4 、LiNiO 2 、LiNi 0 .5 Mn 1.5 O 4 、LiCoO 2 、LiTiS 2 、LiNiO 2 , elemental sulfur and at least one of a sulfur-carbon mixture, that is, the positive electrode active material may include one of the above materials, or may also include multiple of the above materials.

[0092] The active material may also be a negative electrode active material, which may include at least one of graphite, silicon, silicon oxide, graphene, soft carbon and hard carbon, that is, the negative electrode active material may include one of the above materials, or may include multiple of the above materials.

[0093] The conductive agent includes at least one of Super P, VGCF, carbon nanotubes, acetylene black, Ketjen black, and conductive graphene, that is, the conductive agent may include one of the above materials, or may include multiple of the above materials.

[0094] The adhesive includes at least one of polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), styrene-butadiene rubber (SBR), polyacrylic acid (PAA), polyimide (PI), polyacrylonitrile (PAN), polypropylene (PP), polyethylene (PE) and polystyrene (PS), that is, the adhesive may include one of the above materials, or may include multiple of the above materials.

[0095] Solid electrolytes include sulfide solid electrolytes, oxide solid electrolytes and halide electrolytes.

[0096] Among them, sulfide solid electrolytes include Li 10 G 2 S 12 , Li 9.54 Si 1.74 P 1.44 S 11.7 C l0.3 , Li 9.6 P 3 S 12 , Li 6 PS 5X, Li 1.4 Al 0.4 Ti 1.6 (PO 4 ) 3 and Li 6 PS 5 Br, and X in Li 6 PS 5 X is one of Cl, Br or I. That is, the sulfide solid electrolyte may include one of the above materials, or may include multiple of the above materials.

[0097] The oxide solid electrolyte includes Li 7-x La 3 Zr 2-x Ta x O 12 、Li 7-2y La 3 Zr 2-y W y O 12 、Li 7-z La 3 Zr 2- z Nb z O 12 、L i7 La 3 Zr 2 O 12 、Li 1+m Al m Ti 2-m (PO 4 ) 3 、LiPON and Li 1+n Al n Ge 2-n (PO 4 ) 3 at least one of them, where 0.2 < x < 2, 0.2 < y < 2, 0.2 < z < 2, 0.2 < m < 2, 0.2 < n < 2. That is, the oxide solid electrolyte may include one of the above materials, or may include multiple of the above materials.

[0098] The halide solid electrolyte includes Li 3 YC l6 、Li 3 ErC l6 、Li 3 YBr 6 、Li 3 InBr 6 and Li 3 InC l6That is, the halide solid electrolyte may include one of the above materials, or may include multiple of the above materials.

[0099] Furthermore, the membrane 220 is coated with a nano coating, the nano coating includes L i3 PO 4 , A l2 O 3 , LiNbO 3 , LiAlO 2 , L i3 BO 3 , L i2 OZO 2 、MgO、HfO 2 , L i2 S i O 3 , B 2 O 3 , L i2 O、N b2 O 5 , P 2 O 5 、SiO 2 , S c2 O 3 、TiO 2 and ZrO 2 At least one of the above materials, that is, the active material may include one of the above materials, or may include multiple of the above materials.

[0100] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0101] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0102] In the description of the present invention, "plurality" means two or more.

[0103] In the description of the present invention, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0104] In the description of the present invention, “on”, “over” and “above” a first feature from a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0105] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0106] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An electrode sheet preparation device (100), characterized in that: The electrode sheet (200) comprises a current collector (210) and a membrane sheet (220), a plurality of membrane sheets (220) being arranged at intervals on the surface of the current collector (210) along the extension direction of the current collector (210), and the preparation device (100) comprises: A diaphragm feeding mechanism (110) for outputting diaphragms (220); A current collector feeding mechanism (120) for outputting the current collector (210); The composite mechanism (130) is arranged on the downstream side of the membrane feeding mechanism (110) and the current collector feeding mechanism (120) in the feeding direction, and the composite mechanism (130) is used to receive the membrane (220) and the current collector (210), and composite the membrane (220) and the current collector (210) into the electrode sheet (200).

2. The electrode sheet preparation device (100) according to claim 1, characterized in that: The film feeding mechanism (110) comprises a film unwinding device (111) and a cutting device (112).

3. The electrode sheet preparation device (100) according to claim 2, characterized in that: The film feeding mechanism (110) further comprises: a first laminating roller (113) and a second laminating roller (114), wherein the first laminating roller (113) and the second laminating roller (114) are arranged in sequence along the conveying direction of the film (220), and the film (220) outputted by the film (220) unwinding roller is rolled by the first laminating roller (113) and the second laminating roller (114) and conveyed to the composite mechanism (130). The cutting device (112) is arranged on one side of the second laminating roller (114).

4. The electrode sheet preparation device (100) according to claim 2, characterized in that: The composite mechanism (130) comprises a first composite roller (131) and a second composite roller (132), wherein the first composite roller (131) is arranged on the downstream side of the membrane unwinding device (111) to receive the membrane (220), and the second composite roller (132) is arranged on the downstream side of the unwinding roller of the current collector (210) to receive the current collector (210).

5. The electrode sheet preparation device (100) according to claim 4, characterized in that: The first composite roller (131) is constructed to be movable between a first position and a second position relative to the second composite roller (132), wherein, in the first position, the first composite roller (131) receives the membrane sheet (220), and in the second position, the first composite roller (131) and the second composite roller (132) roll-combine the membrane sheet (220) and the current collector (210).

6. The electrode sheet preparation device (100) according to claim 5, characterized in that: The composite mechanism (130) further comprises a displacement drive device, wherein the displacement drive device is transmission-connected to the first composite roller (131).

7. The electrode sheet preparation device (100) according to claim 6, characterized in that: The first composite roller (131) comprises: a first sub-roller (1311) and a second sub-roller (1312), wherein the first sub-roller (1311) and the second sub-roller (1312) are both suitable for moving between the first position and the second position, and when one of the first sub-roller (1311) and the second sub-roller (1312) is in the first position, the other is in the second position.

8. The electrode sheet preparation device (100) according to claim 4, characterized in that: There are two membrane sheet feeding mechanisms (110), and the membrane sheets (220) output by the two membrane sheet feeding mechanisms (110) are respectively output to the first composite roller (131) and the second composite roller (132), and the two membrane sheets (220) are respectively located on both sides of the current collector (210).

9. The electrode sheet preparation device (100) according to claim 1, characterized in that: Also includes: A winding roller (140), the winding roller (140) being arranged on the downstream side of the composite mechanism (130), the winding roller (140) being used to wind up the electrode sheet (200) output by the composite mechanism (130).

10. The electrode sheet preparation device (100) according to claim 9, characterized in that: The winding roller (140) is configured to rotate synchronously with the second composite roller (132) of the composite mechanism (130).

11. A method for preparing an electrode sheet, applied to the electrode sheet preparation device (100) according to any one of claims 1 to 10, characterized in that: The following steps are involved: Controlling the current collector feeding mechanism (120) to transport the current collector (210) to the composite mechanism (130); Controlling the film feeding mechanism (110) to deliver the film (220) to the compounding mechanism (130) according to a preset cycle; The composite mechanism (130) is controlled to roll-combine the membrane (220) and the current collector (210).

12. The method for preparing an electrode sheet according to claim 11, characterized in that: The controlling film feeding mechanism (110) to convey the film (220) to the compounding mechanism (130) according to a preset cycle comprises: Controlling the film sheet (220) unwinding roller to transport the film sheet (220) to the second laminating roller (114) via the first laminating roller (113); Controlling the cutting device (112) to cut the film (220) into a preset shape at the second laminating roller (114); The second laminating roller (114) is controlled to convey the film sheet (220) having a preset shape to the composite mechanism (130).

13. The method for preparing an electrode sheet according to claim 11, characterized in that: The controlling the composite mechanism (130) to roll-combine the membrane (220) and the current collector (210) comprises: Controlling the first composite roller (131) to move to a second position, and performing roll-compression composite operation on the current collector (210) and the membrane (220) with the first composite roller (131); The first composite roller (131) is controlled to retract to the first position, and the current collector feeding mechanism (120) and the second composite roller (132) are controlled to continue to operate until the membrane (220) moves to a preset position along with the current collector (210).

14. An electrode sheet (200), characterized in that: The electrode sheet (200) is produced by the electrode sheet production device (100) according to any one of claims 1 to 11, and / or by the electrode sheet production method according to any one of claims 12 to 13.

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