Battery pole piece lamination method

Abstract

The invention provides a battery pole piece lamination method, and relates to the technical field of new energy batteries. The method comprises the following steps: acquiring a to-be-processed positive plate, and thermally compounding the to-be-processed positive plate with an isolating membrane to form a first composite belt; the first composite belt is arranged on a lamination device in an attached mode, a plurality of first negative plates are placed in each first V-shaped groove in the lamination device, the first composite belt and the first negative plates are composited, and a second composite belt is formed; rotating the second composite belt, placing a plurality of second negative plates in second V-shaped grooves adjacent to the first V-shaped grooves, and compounding the second composite belt with the plurality of second negative plates to form a third composite belt; and manufacturing a naked battery cell according to the third composite belt. According to the scheme, the pole pieces do not need to be stacked in sequence, the stacking efficiency is improved, the equipment investment cost is reduced, the number of the pole pieces stacked at the same time can be adjusted according to actual production requirements, and the flexibility is high.

Description

Technical Field

[0001] The present application relates to the technical field of new energy batteries, and in particular to a method for stacking battery pole pieces. Background Art

[0002] The existing new energy vehicle battery pole piece stacking is a traditional Z-shaped stacking, which is completed by alternating the positive pole piece, the negative pole piece and the isolation film. In traditional stacking equipment, the pole piece is first punched and formed by a die-cutting machine and placed in a material box. After the material box is full, it is transferred to the stacking machine. During the stacking process of the positive and negative pole pieces, the stacking platform is first moved to the position of the positive pole piece to stack the positive pole piece, and then the stacking platform is moved to the position of the negative pole piece to stack the negative pole piece. In this way, the stacking platform moves back and forth, and the manipulator stacks the pole pieces in sequence. The traditional Z-shaped stacking is inefficient and the equipment investment cost is high. When the pole piece is long or the pole piece is soft, the pole piece is easy to skew, and there is a cumulative error in the spacing between the pole pieces. The positioning accuracy of the pole piece cannot be guaranteed, resulting in unqualified alignment of the pole piece, and there are quality and safety risks. The longer the electrode is, the wider the width of the isolation membrane is required. During the lamination process, the fixed pressing needles can easily cause wrinkles in the isolation membrane, causing local lithium deposition in the battery cell and creating a safety hazard.

[0003] Therefore, the existing lamination technology is inefficient, cannot guarantee the alignment of longer pole pieces, and easily causes wrinkles in the isolation membrane. The lamination method needs to be further enhanced and improved. Summary of the invention

[0004] The purpose of the present application is to provide a battery pole sheet stacking method to avoid the problems of poor stacking accuracy and low efficiency in the prior art.

[0005] To achieve the above-mentioned purpose, an embodiment of the present application provides a battery electrode lamination method, comprising:

[0006] Obtaining a positive electrode sheet to be processed, and thermally compounding the positive electrode sheet to be processed with a separator to form a first composite tape;

[0007] Laminating the first composite tape on a laminating device, placing a plurality of first negative electrode sheets in each first V-shaped groove in the laminating device, and laminating the first composite tape with the plurality of first negative electrode sheets to form a second composite tape;

[0008] After rotating the second composite tape, placing a plurality of second negative electrode sheets in second V-shaped grooves adjacent to the first V-shaped grooves, and composite the second composite tape with the plurality of second negative electrode sheets to form a third composite tape;

[0009] A bare battery cell is manufactured according to the third composite tape.

[0010] Optionally, obtaining a positive electrode sheet to be processed, and thermally compounding the positive electrode sheet to be processed with a separator to form a first composite tape, comprising:

[0011] Obtaining a positive electrode sheet to be processed; the positive electrode sheet to be processed is formed by cutting the positive electrode coil to be processed according to a preset length using a cutting knife;

[0012] Placing the positive electrode sheet to be processed on the electrode sheet composite belt, and laminating the first isolation film and the second isolation film to the upper and lower surfaces of the positive electrode sheet to be processed respectively;

[0013] The positive electrode sheet to be processed, the first isolation film and the second isolation film are hot-pressed and composited to form a first composite tape.

[0014] Optionally, the positive electrode sheet to be processed, the first separator and the second separator are hot-pressed and composited to form a first composite tape, comprising:

[0015] Using the first isolation film and the second isolation film, the positive electrode sheet to be processed is fixed and output to a preheating device;

[0016] The preheating device is used to raise the temperature to the required composite temperature, and the first isolation film and the second isolation film are respectively roller-rolled to hot-press and composite the positive electrode sheet to be processed, the first isolation film and the second isolation film to form a first composite tape.

[0017] Optionally, the lamination device comprises:

[0018] A plurality of the first V-shaped grooves and the second V-shaped grooves; the first V-shaped grooves and the second V-shaped grooves are connected to each other to form a wavy V-shaped groove as a whole;

[0019] Two pressing plate structures are respectively located at two ends of the V-shaped groove as a whole;

[0020] A first manipulator is connected to one of the two pressing plate structures; the first manipulator is used to pull the first composite belt to move on the V-shaped groove as a whole;

[0021] A plurality of second manipulators, wherein the second manipulators are located above the first V-shaped groove, and the plurality of second manipulators are connected in parallel; the second manipulators are used for adsorbing the negative electrode sheet;

[0022] A plurality of cylindrical roller structures, each of which is disposed in the second V-shaped groove.

[0023] Optionally, the first composite tape is laminated on a lamination device, a plurality of first negative electrode sheets are placed in each of the first V-shaped grooves, and the first composite tape is laminated with the plurality of first negative electrode sheets to form a second composite tape, comprising:

[0024] Using the first manipulator to pull the first composite belt, the first composite belt passes through each of the first V-shaped groove and the second V-shaped groove to form a first interlayer on the left and right sides of the first V-shaped groove, and a second interlayer on the left and right sides of the second V-shaped groove;

[0025] Using a plurality of the second manipulators to simultaneously absorb a plurality of first negative electrode sheets, and placing the plurality of first negative electrode sheets in the first interlayer; the number of the first negative electrode sheets is N, and N is the same as the number of the V-shaped grooves;

[0026] Anti-sticking plates are respectively arranged on the first interlayer and the second interlayer; the number of the anti-sticking plates is 2N;

[0027] The two pressing plate structures are used to hot-press the two ends of the first composite tape, so as to composite the first composite tape with the plurality of the first negative electrode sheets to form a second composite tape.

[0028] Optionally, after rotating the second composite tape, placing a plurality of second negative electrode sheets in a second V-shaped groove adjacent to the first V-shaped groove, and composite the second composite tape with the plurality of second negative electrode sheets to form a third composite tape, comprising:

[0029] After rotating the second composite tape by 180 degrees, using a plurality of the second manipulators to absorb a plurality of second negative electrode sheets, and placing the plurality of second negative electrode sheets into the second interlayer;

[0030] The two pressing plate structures are used to hot-press the two ends of the second composite tape, and the second composite tape is composited with a plurality of the second negative electrode sheets to form a third composite tape.

[0031] Optionally, the method further comprises:

[0032] The V-shaped angles of the first V-shaped grooves are the same as the V-shaped angles of the second V-shaped grooves, and each of the V-shaped angles is adjustable.

[0033] Optionally, the method further comprises:

[0034] reducing the V-shaped angles of the first V-shaped grooves to a preset angle;

[0035] The plurality of the second manipulators are used to absorb the negative electrode sheets, and the negative electrode sheets are positioned and placed in the corresponding V-shaped grooves at the same time by using their own gravity.

[0036] Optionally, an anti-adhesion plate is provided on the first interlayer and the second interlayer respectively, including:

[0037] In the first interlayer, after a plurality of the first negative electrode sheets are simultaneously attached to a side away from the first manipulator, an anti-sticking plate is respectively arranged in each of the first interlayers and each of the second interlayers; the area of ​​the anti-sticking plate at least covers the area of ​​the negative electrode sheet.

[0038] The beneficial effects of the above technical solution of the present application are as follows:

[0039] In an embodiment of the present application, the method includes obtaining a positive electrode sheet to be processed, thermally compounding the positive electrode sheet to be processed with an isolation film to form a first composite tape, and laminating the first composite tape on a stacking device, placing a plurality of first negative electrode sheets in each first V-groove in the stacking device, compounding the first composite tape with a plurality of first negative electrode sheets to form a second composite tape, and then rotating the second composite tape, compounding a plurality of second negative electrode sheets with the second composite tape to form a third composite tape; a bare battery cell is made according to the third composite tape, and each electrode sheet does not need to be stacked in sequence, thereby improving the stacking efficiency and reducing the equipment investment cost. The number of electrode sheets stacked at the same time can be adjusted according to actual production needs, and the flexibility is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of a process for laminating battery pole pieces provided in an embodiment of the present application;

[0041] Figure 2 A schematic diagram of the operation of making a first composite sheet provided in an embodiment of the present application;

[0042] Figure 3 One of the operation schematic diagrams of making a second composite sheet provided in an embodiment of the present application;

[0043] Figure 4 The second schematic diagram of the operation of making the second composite sheet provided in the embodiment of the present application;

[0044] Figure 5 One of the operation schematic diagrams of making the third composite sheet provided in the embodiment of the present application;

[0045] Figure 6 The second schematic diagram of the operation of making the third composite sheet provided in the embodiment of the present application;

[0046] Figure 7 A schematic diagram of the structure of a bare battery cell provided in an embodiment of the present application. DETAILED DESCRIPTION

[0047] In order to make the technical problems, technical solutions and advantages to be solved by the present application clearer, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0048] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present application. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0049] In the embodiments of the present application, the term "and / or" describes the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0050] In the embodiments of the present application, the term "plurality" refers to two or more than two, and other quantifiers are similar.

[0051] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0052] like Figure 1 As shown, a battery electrode lamination method provided in an embodiment of the present application includes:

[0053] Step 11, obtaining the positive electrode sheet to be processed, and thermally compounding the positive electrode sheet to be processed with the isolation film to form a first composite tape; here, the positive electrode sheet to be processed is a long electrode sheet, and the length of the long electrode sheet is more than 300 mm.

[0054] Step 12, laminating the first composite tape on a lamination device, placing a plurality of first negative electrode sheets in each first V-shaped groove in the lamination device, and laminating the first composite tape with the plurality of first negative electrode sheets to form a second composite tape;

[0055] Step 13, after rotating the second composite tape, placing a plurality of second negative electrode sheets in second V-shaped grooves adjacent to the first V-shaped grooves, and composite the second composite tape with the plurality of second negative electrode sheets to form a third composite tape;

[0056] Step 14: manufacturing a bare battery cell according to the third composite tape.

[0057] Optionally, the composite unit can be stacked in multiple units according to the cell capacity requirement, and the number of composite units is M, where M is a positive integer greater than or equal to 1.

[0058] In an embodiment of the present application, a method for making a composite tape of a pole piece is provided, and the composite tape of the pole piece can be made into a composite tape of a positive pole piece or a composite tape of a negative pole piece. Obtain the positive pole piece to be processed, and use the upper and lower layers of isolation films to hot-press and composite the positive pole piece or the negative pole piece together to form a first composite tape. After the first composite tape is rolled up, the first composite tape is laminated and set on a laminating device, and a plurality of first negative pole pieces are placed in each first V-shaped groove in the laminating device, and the first composite tape is composited with the plurality of first negative pole pieces to form a second composite tape. Among them, a plurality of first negative pole pieces can be placed in each first V-shaped groove in the laminating device at the same time. Since no negative pole piece is placed in the second V-shaped groove before rotation, after the second composite tape is rotated, a plurality of second negative pole pieces are placed in the second V-shaped groove adjacent to the first V-shaped groove, and the second composite tape is composited with the plurality of second negative pole pieces to form a third composite tape; a bare cell is made according to the third composite tape. Among them, the number of the third composite tape can be set according to the needs of the bare cell, and is not limited here.

[0059] It should be noted that the first V-shaped groove and the second V-shaped groove are arranged adjacent to each other, and the first V-shaped groove and the second V-shaped groove are oriented in opposite directions.

[0060] In the present application, after the positive electrode sheets are composited, multiple negative electrode sheets are composited at the same time. This electrode sheet composite method has a simple structure, high electrode sheet positioning accuracy, and high production efficiency.

[0061] Optionally, the above step 11 includes:

[0062] Obtain the positive electrode sheet to be processed; the positive electrode sheet to be processed is formed by cutting the positive electrode roll to be processed according to a preset length using a cutting knife; here, the positive electrode sheet to be processed refers to a long electrode sheet, and the long electrode sheet is formed by cutting according to a length greater than 300 mm.

[0063] Placing the positive electrode sheet to be processed on the electrode sheet composite belt, and laminating the first isolation film and the second isolation film to the upper and lower surfaces of the positive electrode sheet to be processed respectively;

[0064] The positive electrode sheet to be processed, the first isolation film and the second isolation film are hot-pressed and composited to form a first composite tape.

[0065] Reference Figure 2As shown, in the embodiment of the present application, the positive electrode coil 101 to be processed is obtained, and the positive electrode coil 101 is cut into a fixed preset length by a cutting knife 102, and is cut into positive electrode sheets 103 to be processed with a fixed preset length; the fixed preset length can be set according to the requirements of the battery to be processed later. The positive electrode sheet 103 to be processed is set on the electrode sheet composite belt, and the upper and lower surfaces of the positive electrode sheet 103 to be processed are respectively attached to the first isolation film 104 and the second isolation film 105; one of the first isolation film 104 and the second isolation film 105 is the upper isolation film of the positive electrode sheet 103 to be processed, and the other is the lower isolation film; the positive electrode sheet 103 to be processed, the first isolation film 104 and the second isolation film 105 are hot-pressed and composited to form a first composite belt.

[0066] Optionally, the positive electrode sheet to be processed, the first separator and the second separator are hot-pressed and composited to form a first composite tape, comprising:

[0067] Using the first isolation film and the second isolation film, the positive electrode sheet to be processed is fixed and output to a preheating device;

[0068] The preheating device is used to raise the temperature to the required composite temperature, and the first isolation film and the second isolation film are respectively roller-rolled to hot-press and composite the positive electrode sheet to be processed, the first isolation film and the second isolation film to form a first composite tape.

[0069] In the present application, continue to refer to Figure 2 As shown, the lower PET film circulation device 106 is used to hold up the positive electrode sheet 103 to be processed, and the second isolation film 105 is set below the positive electrode sheet 103 to be processed, and then the upper PET film circulation device 107 is used to press the first isolation film 104 to the top of the positive electrode sheet 103 to be processed. That is, the lower PET film circulation device 106 and the upper PET film circulation device 107 are used to fix the positive electrode sheet 103 to be processed by using the first isolation film 104 and the second isolation film 105, and then the first The isolation film 104, the second isolation film 105 and the positive electrode sheet 103 to be processed are output to the preheating device, which can be a preheating furnace 108; the preheating furnace 108 is used to heat up to the required composite temperature, and the first isolation film 104 and the second isolation film 105 are respectively subjected to up and down hot rolling by rollers 109, so that the first isolation film 104, the second isolation film 105 and the positive electrode sheet 103 to be processed are hot-pressed and composited together to form a first composite tape 110, and the first composite tape 110 is finally collected into a pole roll.

[0070] Reference Figure 3 and Figure 4 As shown, optionally, the lamination device comprises:

[0071] A plurality of the first V-shaped grooves and the second V-shaped grooves; the first V-shaped grooves and the second V-shaped grooves are connected to each other to form a wavy V-shaped groove as a whole;

[0072] Two pressing plate structures are respectively located at two ends of the V-shaped groove as a whole;

[0073] A first manipulator is connected to one of the two pressing plate structures; the first manipulator is used to pull the first composite belt to move on the V-shaped groove as a whole;

[0074] A plurality of second manipulators, wherein the second manipulators are located above the first V-shaped groove, and the plurality of second manipulators are connected in parallel; the second manipulators are used for adsorbing the negative electrode sheet;

[0075] A plurality of cylindrical roller structures, each of which is disposed in the second V-shaped groove.

[0076] In the embodiment of the present application, the first V-shaped groove 201 and the second V-shaped groove 202 are connected to each other to form a wavy V-shaped groove as a whole. The first V-shaped groove 201 and the second V-shaped groove 202 are oriented in opposite directions, and the first V-shaped groove 201 and the second V-shaped groove 202 have the same angle. Two pressing plate structures 203 are respectively located at both ends of the V-shaped groove as a whole. The first manipulator 204 is connected to one of the two pressing plate structures 203. The first manipulator 204 is used to pull the first composite belt 110 to move on the V-shaped groove as a whole. After the V-shaped groove as a whole completely covers the first composite belt 110, the first composite belt 110 is cut, and another pressing plate structure 203 is arranged near the cutting end. Multiple second manipulators 205 are respectively located above the first V-shaped groove 201, and the multiple second manipulators 205 are connected in parallel, and one second manipulator 205 is set corresponding to the opening direction of a first V-shaped groove 201; the second manipulator 205 is used to adsorb the negative electrode sheet 206; the stacking device of the present application also includes multiple cylindrical roller structures 207, each cylindrical roller structure 207 is arranged in the second V-shaped groove 202, and a cylindrical roller structure 207 is arranged in a second V-shaped groove 202, and the multiple cylindrical roller structures 207 are used to support the first composite belt 110, and the multiple cylindrical roller structures 207 play a role in positioning the first composite belt 110.

[0077] Specifically, the first composite tape is laminated on a lamination device, a plurality of first negative electrode sheets are placed in each of the first V-shaped grooves, and the first composite tape is laminated with the plurality of first negative electrode sheets to form a second composite tape, including:

[0078] Using the first manipulator to pull the first composite belt, the first composite belt passes through each of the first V-shaped groove and the second V-shaped groove to form a first interlayer on the left and right sides of the first V-shaped groove, and a second interlayer on the left and right sides of the second V-shaped groove;

[0079] Using a plurality of the second manipulators to simultaneously absorb a plurality of first negative electrode sheets, and placing the plurality of first negative electrode sheets in the first interlayer; the number of the first negative electrode sheets is N, and N is the same as the number of the V-shaped grooves;

[0080] Anti-sticking plates are respectively arranged on the first interlayer and the second interlayer; the number of the anti-sticking plates is 2N;

[0081] The two pressing plate structures are used to hot-press the two ends of the first composite tape, so as to composite the first composite tape with the plurality of the first negative electrode sheets to form a second composite tape.

[0082] In the present application, continue to refer to Figure 3 and Figure 4 As shown, the first composite tape 110 is passed through each of the first V-shaped groove 201 and the second V-shaped groove 202 to form a first interlayer on the left and right sides of the first V-shaped groove 201, and a second interlayer on the left and right sides of the second V-shaped groove 202, and the first composite tape 110 is pulled by the first manipulator 204 to move on the first V-shaped groove 201 and the second V-shaped groove 202; here, the first V-shaped groove 201 and the second V-shaped groove 202 can also be understood as phoenix qin grooves. Specifically, the first manipulator 204 pulls the first composite tape 110 of the positive electrode sheet, and the negative electrode sheet 206 (here referred to as the first negative electrode sheet) is adsorbed by multiple second manipulators 205 of the lamination device, and the first composite tape 110 is lifted up in sequence by multiple cylindrical roller structures 207, and multiple first negative electrode sheets are placed in the first interlayer. Anti-sticking plates 208 are respectively arranged in the first interlayer and the second interlayer; the number of the anti-sticking plates 208 is 2N; two pressing plate structures 203 are used to hot-press the two ends of the first composite tape 110, and the first composite tape 110 is composited with the plurality of the first negative electrode sheets to form a second composite tape.

[0083] Furthermore, an anti-adhesion plate 208 is respectively provided on the first interlayer and the second interlayer, including:

[0084] In the first interlayer, after the plurality of the first negative electrode sheets are simultaneously attached to the side away from the first manipulator, one anti-adhesion plate is respectively provided in each of the first interlayer and each of the second interlayer; the area of ​​the anti-adhesion plate at least covers the area of ​​the negative electrode sheet in any one side of the first interlayer or the second interlayer. Here, the area of ​​the negative electrode sheet may be the area of ​​the first negative electrode sheet or the area of ​​the second negative electrode sheet.

[0085] In this application, please refer to Figure 3 and Figure 4 As shown, after a plurality of first negative electrode sheets are simultaneously attached to the side away from the first manipulator, an anti-adhesion plate is provided in each first interlayer and each second interlayer. The anti-adhesion plate can prevent the first interlayer from adhering to the electrode sheet composite tape, that is, prevent the electrode sheet composite tape of the first V-shaped groove 201 from adhering to each other. It can also prevent the electrode sheet composite tape in the second V-shaped groove 202 from adhering to each other. The anti-adhesion plate device function facilitates the subsequent flipping and opening of the electrode sheet composite tape.

[0086] Optionally, the number of the first negative electrode sheets is N, which is the same as the number of the V-shaped grooves; the number of the first negative electrode sheets can be adjusted according to actual production requirements, and N is a positive integer greater than or equal to 1.

[0087] Optionally, the method further comprises:

[0088] reducing the V-shaped angles of the first V-shaped grooves to a preset angle;

[0089] The plurality of the second manipulators are used to absorb the negative electrode sheets, and the negative electrode sheets are positioned and placed in the corresponding V-shaped grooves at the same time by using their own gravity.

[0090] In the embodiment of the present application, a plurality of anti-adhesion plates 208 are placed in the first V-shaped groove 201 and the second V-shaped groove 202 (the number of anti-adhesion plates is 2N), and a servo motor can be used to drive the pressure plate structure 203, drive the plurality of cylindrical roller structures 207 to shorten the distance between the positive and negative electrodes and the isolation film, and perform hot pressing through the front and rear pressure plate structures 203 to achieve the first negative electrode sheet fixed on the first composite belt 110. Since the anti-adhesion plates 208 are located between the first composite belt 110, the negative electrode sheet 206 can be fixed on the first composite belt 110, and at the same time, it is ensured that the layers of the first composite belt 110 in the second V-shaped groove 202 are not adhered to each other, which is convenient for the subsequent opening of the positive electrode sheet composite belt, and the subsequent placement of the second negative electrode sheet in the second V-shaped groove 202. Multiple negative electrode sheets 206 fall into the first V-shaped groove 201 at the same time, shortening the negative electrode sheet stacking time and improving the stacking efficiency.

[0091] Optionally, the method further comprises:

[0092] The V-shaped angles of the first V-shaped grooves are the same as the V-shaped angles of the second V-shaped grooves, and each of the V-shaped angles is adjustable.

[0093] Optionally, after rotating the second composite tape, placing a plurality of second negative electrode sheets in a second V-shaped groove adjacent to the first V-shaped groove, and composite the second composite tape with the plurality of second negative electrode sheets to form a third composite tape, comprising:

[0094] After rotating the second composite tape by 180 degrees, using a plurality of the second manipulators to absorb a plurality of second negative electrode sheets, and placing the plurality of second negative electrode sheets into the second interlayer;

[0095] The two pressing plate structures are used to hot-press the two ends of the second composite tape, and the second composite tape is composited with a plurality of the second negative electrode sheets to form a third composite tape.

[0096] Reference Figure 5 and Figure 6 As shown, in the embodiment of the present application, after the second composite belt is horizontally flipped 180 degrees, the positions of the original first V-groove and the second V-groove are Figure 3 The position in the second V-shaped groove is just opposite, the second V-shaped groove faces the first robot arm, and the first V-shaped groove is in contact with the cylindrical roller structure. The two pressing plate structures are used to hot press the two ends of the second composite belt, and the second composite belt is composited with a plurality of the second negative electrode sheets to form a third composite belt. The process of forming the third composite belt is similar to the process of forming the second composite belt in principle, and will not be repeated here. It only needs to ensure that the positions of the first V-shaped groove and the second V-shaped groove are accurately positioned after the second composite belt is horizontally flipped 180 degrees.

[0097] Specifically, the first V-shaped groove and the second V-shaped groove are rotated 180° by the lamination device, the first manipulator pulls the second composite belt, and the second composite belt is lifted up in sequence by the cylindrical roller structure, the second manipulator adsorbs the negative electrode sheet and places it in the rotated second V-shaped groove, and the negative electrode sheet falls into the interlayer of the second composite belt by its own gravity. Multiple parallel manipulators can adsorb multiple negative electrode sheets at the same time and place multiple negative electrode sheets in the interlayer of the second composite belt (the number of negative electrode sheets is N, where N is a positive integer greater than or equal to 1), the servo motor drives the screw rod, and the linkage plate structure 203 is moved by hot pressing, driving the cylindrical roller structure to shorten the distance between the positive electrode sheet 301, the negative electrode sheet and the isolation film 302, and the positive electrode sheet, the isolation film and the negative electrode sheet are fixed together by the hot pressing of the front and rear plate structures 203.

[0098] Reference Figure 7 As shown, according to the size of the positive electrode sheet and the negative electrode sheet, the third composite tape 401 is divided into multiple composite units, and the multiple composite units are composited into the entire battery. According to actual production needs, the number of positive and negative electrodes in a single composite unit can be appropriately adjusted. According to the design capacity requirements of the battery cell, the number of single composite units can be adjusted to meet the battery cell capacity and complete the stacking of the entire battery cell.

[0099] Optionally, the present application may cancel the anti-sticking plate device. The manipulator pulls the pole piece composite belt, and lifts the composite belt in turn through the cylindrical roller. Multiple manipulators adsorb multiple pole pieces and place them in the upper V-shaped groove. The pole pieces fall into the interlayer of the pole piece composite belt by their own gravity. Multiple manipulators on the other side adsorb multiple pole pieces, place the pole pieces in the lower V-shaped groove, and rely on the manipulator to complete the positioning of the lower pole piece. Multiple parallel manipulators can adsorb multiple pole pieces at the same time, and multiple upper and lower manipulators simultaneously place multiple pole pieces in the interlayer of the pole piece composite belt (the number of pole pieces is N, where N is a positive integer greater than or equal to 1). The servo motor drives the screw rod to drive the cylindrical roller to shorten the distance between the positive and negative electrodes and the isolation membrane. The left and right mechanical pressure claws fix the pole piece composite belt and the pole pieces in each interlayer. The lower manipulator is pulled out, and the positive pole piece, isolation membrane and negative pole piece are fixed together through hot pressing on the left and right hot pressing plates. According to actual production needs, the number of positive and negative electrodes in a single unit can be appropriately adjusted. According to the design capacity requirements of the battery cell, the battery cell capacity can be met by adjusting the number of single units to complete the stacking of the entire battery cell.

[0100] In summary, the present application relies on the pole piece's own weight to achieve positioning and can stack multiple pole pieces in parallel at the same time, thereby solving the problem of difficult positioning of long pole pieces, and the parallel phoenix-type (V-groove) stacking device is used to improve the stacking efficiency.

[0101] In the method for making a pole piece composite tape, the pole piece composite tape can be made into a positive pole piece composite tape or a negative pole piece composite tape. The positive pole piece or the negative pole piece is composited together by hot pressing using upper and lower layers of isolation films. The pole piece composite tape device includes pole piece unwinding, cutting, upper isolation film unwinding, lower isolation film unwinding, upper PET tape circulation device, lower PET tape circulation device, preheating device, upper and lower hot roller pressing devices and pole piece composite tape winding. After the long pole piece is cut, it is fixed by upper and lower isolation films to ensure positioning accuracy. After the preheating device, the pole piece, upper isolation film and lower isolation film are heated to the required composite temperature, and then the pole piece is composited with the upper and lower isolation films by rolling with upper and lower rollers. This pole piece composite method has a simple structure, high pole piece positioning accuracy and high production efficiency.

[0102] In the V-groove parallel lamination method, the long pole piece is positioned by its own weight, and multiple pole pieces can be positioned at the same time. The positive pole piece or the negative pole piece is fixed on the pole piece composite belt, and the pole piece composite belt and the fixed pole piece have opposite polarity. This V-groove parallel lamination method uses the pole piece's own weight to sink, perfectly solving the problem of long pole piece positioning accuracy, while ensuring that multiple pole pieces are positioned at the same time, and the positioning consistency is high, which improves the pole piece positioning accuracy and production efficiency.

[0103] The stacking technology of the present application uses the long pole piece's own weight to sink to achieve pole piece positioning. The manipulator adsorbs the pole piece and places it in the V-groove. The pole piece is in a natural state as a whole, without external force applied, and only relies on its own weight to sink. The pole piece will not be deformed due to the length of the pole piece or the softness of the pole piece. The pole piece relies on its own weight to position in the V-groove. The pole piece positioning accuracy is high, the gravity of each pole piece is similar, and the position consistency in the V-groove is high, which can ensure the error of the spacing between each unit of the pole piece. This V-groove parallel stacking method uses the pole piece's own weight to sink, which perfectly solves the problem of long pole piece positioning accuracy. At the same time, it can ensure that multiple pole pieces are positioned at the same time, and the positioning consistency is high, which improves the pole piece positioning accuracy and improves production efficiency.

[0104] The present application can control multiple manipulators to absorb multiple pole pieces and place them into the V-shaped grooves, and simultaneously complete the positioning operation of multiple pole pieces. Compared with the existing lamination technology, it is not necessary to stack each pole piece in sequence, which improves the lamination efficiency and reduces the equipment investment cost. The number of pole pieces to be stacked simultaneously can be adjusted according to actual production needs, which is highly flexible.

[0105] The above exemplary embodiments are described with reference to the accompanying drawings, and many different forms and embodiments are feasible without departing from the spirit and teachings of the present application. Therefore, the present application should not be constructed as a limitation of the exemplary embodiments proposed herein. More specifically, these exemplary embodiments are provided so that the present application will be perfect and complete, and the scope of the present application will be conveyed to those who are familiar with the technology. In these figures, the component sizes and relative sizes may be exaggerated for clarity. The terms used here are only based on the purpose of describing specific exemplary embodiments and are not intended to be limiting. As used herein, unless the text clearly indicates otherwise, the singular forms "one", "an" and "the" are intended to include these multiple forms. It will be further understood that the terms "comprising" and / or "including" when used in this specification indicate the presence of the features, integers, steps, operations, components and / or components, but do not exclude the presence or increase of one or more other features, integers, steps, operations, components, components and / or their groups. Unless otherwise indicated, when stated, a range of values ​​includes the upper and lower limits of that range and any subranges therebetween.

[0106] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A battery electrode lamination method, characterized in that: include: Obtaining a positive electrode sheet to be processed, and thermally compounding the positive electrode sheet to be processed with a separator to form a first composite tape; Laminating the first composite tape on a laminating device, placing a plurality of first negative electrode sheets in each first V-shaped groove in the laminating device, and laminating the first composite tape with the plurality of first negative electrode sheets to form a second composite tape; After rotating the second composite tape, placing a plurality of second negative electrode sheets in second V-shaped grooves adjacent to the first V-shaped grooves, and composite the second composite tape with the plurality of second negative electrode sheets to form a third composite tape; A bare battery cell is manufactured according to the third composite tape.

2. The method according to claim 1, characterized in that Obtaining a positive electrode sheet to be processed, and thermally compounding the positive electrode sheet to be processed with a separator to form a first composite tape, comprising: Obtaining a positive electrode sheet to be processed; the positive electrode sheet to be processed is formed by cutting the positive electrode coil to be processed according to a preset length using a cutting knife; Placing the positive electrode sheet to be processed on the electrode sheet composite belt, and laminating the first isolation film and the second isolation film to the upper and lower surfaces of the positive electrode sheet to be processed respectively; The positive electrode sheet to be processed, the first isolation film and the second isolation film are hot-pressed and composited to form a first composite tape.

3. The method according to claim 2, characterized in that The positive electrode sheet to be processed, the first separator and the second separator are hot-pressed and composited to form a first composite tape, comprising: Using the first isolation film and the second isolation film, the positive electrode sheet to be processed is fixed and output to a preheating device; The preheating device is used to raise the temperature to the required composite temperature, and the first isolation film and the second isolation film are respectively roller-rolled to hot-press and composite the positive electrode sheet to be processed, the first isolation film and the second isolation film to form a first composite tape.

4. The method according to claim 1, characterized in that: The lamination device comprises: A plurality of the first V-shaped grooves and the second V-shaped grooves; the first V-shaped grooves and the second V-shaped grooves are connected to each other to form a wavy V-shaped groove as a whole; Two pressing plate structures are respectively located at two ends of the V-shaped groove as a whole; A first manipulator is connected to one of the two pressing plate structures; the first manipulator is used to pull the first composite belt to move on the V-shaped groove as a whole; A plurality of second manipulators, wherein the second manipulators are located above the first V-shaped groove, and the plurality of second manipulators are connected in parallel; the second manipulators are used for adsorbing the negative electrode sheet; A plurality of cylindrical roller structures, each of which is disposed in the second V-shaped groove.

5. The method according to claim 4, characterized in that The first composite tape is laminated on a lamination device, a plurality of first negative electrode sheets are placed in each of the first V-shaped grooves, and the first composite tape is laminated with the plurality of first negative electrode sheets to form a second composite tape, including: Using the first manipulator to pull the first composite belt, the first composite belt passes through each of the first V-shaped groove and the second V-shaped groove to form a first interlayer on the left and right sides of the first V-shaped groove, and a second interlayer on the left and right sides of the second V-shaped groove; Using a plurality of the second manipulators to simultaneously absorb a plurality of first negative electrode sheets, and placing the plurality of first negative electrode sheets in the first interlayer; the number of the first negative electrode sheets is N, and N is the same as the number of the V-shaped grooves; Anti-sticking plates are respectively arranged on the first interlayer and the second interlayer; the number of the anti-sticking plates is 2N; The two pressing plate structures are used to hot-press the two ends of the first composite tape, so as to composite the first composite tape with the plurality of the first negative electrode sheets to form a second composite tape.

6. The method according to claim 5, characterized in that After the second composite tape is rotated, a plurality of second negative electrode sheets are placed in a second V-shaped groove adjacent to the first V-shaped groove, and the second composite tape is composited with the plurality of second negative electrode sheets to form a third composite tape, comprising: After rotating the second composite tape by 180 degrees, using a plurality of the second manipulators to absorb a plurality of second negative electrode sheets, and placing the plurality of second negative electrode sheets into the second interlayer; The two pressing plate structures are used to hot-press the two ends of the second composite tape, and the second composite tape is composited with a plurality of the second negative electrode sheets to form a third composite tape.

7. The method according to claim 4, characterized in that The method further comprises: The V-shaped angles of the first V-shaped grooves are the same as the V-shaped angles of the second V-shaped grooves, and each of the V-shaped angles is adjustable.

8. The method according to claim 7, characterized in that The method further comprises: reducing the V-shaped angles of the first V-shaped grooves to a preset angle; The plurality of the second manipulators are used to absorb the negative electrode sheets, and the negative electrode sheets are positioned and placed in the corresponding V-shaped grooves at the same time by using their own gravity.

9. The method according to claim 5, characterized in that The first interlayer and the second interlayer are respectively provided with anti-adhesion plates, including: In the first interlayer, after a plurality of the first negative electrode sheets are simultaneously attached to the side away from the first manipulator, an anti-sticking plate is respectively arranged in each of the first interlayers and each of the second interlayers; the area of ​​the anti-sticking plate at least covers the area of ​​the negative electrode sheet.

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