Composite foil, pole piece, pole core and manufacturing method of pole core

Abstract

The application provides a composite foil, a pole piece, a pole core and a manufacturing method of the pole core, and relates to the technical field of batteries. The composite foil comprises a base layer and a plurality of conductive layers, each of the conductive layers is arranged on the opposite two surfaces of the base layer, each of the conductive layers on the two surfaces of the base layer is arranged in one-to-one correspondence, the conductive layers on the same surface are arranged in sequence and at intervals along a preset direction, and each of the conductive layers has a preset interval between two adjacent conductive layers. The composite foil provided in the application embodiment can be cut within the preset interval, so that burrs are avoided after cutting of the conductive layers, and short circuit is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a composite foil, a pole piece, a pole core and a manufacturing method of the pole core. BACKGROUND

[0002] At present, the laminated battery is widely used in the field of power batteries. Compared with the wound battery, the laminated battery has higher energy density, longer cycle life and more uniform pole piece swelling force.

[0003] In the prior art, the laminated battery includes a plurality of pole pieces. The pole pieces are formed by cutting the composite foil. The composite foil includes an insulating layer and a conductive layer arranged on both sides of the insulating layer. When cutting, the insulating layer and the metal layer need to be cut off together.

[0004] However, the above-mentioned metal layer will generate more burrs after cutting, which will cause the battery to be more prone to short circuit. SUMMARY

[0005] The present application provides a composite foil, a pole piece, a pole core and a manufacturing method of the pole core, to solve the problem that the metal layer in the prior art will generate more burrs after cutting, which will cause the battery to be more prone to short circuit.

[0006] In a first aspect, the present application provides a composite foil, comprising: a base layer and a plurality of conductive layers;

[0007] Each of the conductive layers is arranged on the opposite two surfaces of the base layer, and each of the conductive layers on the two surfaces of the base layer is arranged one by one, and the conductive layers on the same surface are arranged in sequence along a predetermined direction.

[0008] The adjacent two conductive layers have a predetermined interval.

[0009] In a possible implementation, the predetermined interval is greater than or equal to 1 mm and less than or equal to 3 mm.

[0010] In a possible implementation, the thickness of the base layer is greater than or equal to 2 μm and less than or equal to 10 μm.

[0011] In a possible implementation, the thickness of the conductive layer is greater than or equal to 1 μm and less than or equal to 5 μm.

[0012] In a possible implementation, the conductive layer is a copper foil layer or an aluminum foil layer.

[0013] In a second aspect, the present application provides a pole piece, comprising a slurry layer and any of the composite foils in the first aspect, and the slurry layer corresponds to cover the conductive layer of the composite foil.

[0014] In a possible implementation, the pole piece further comprises a pole tab, the pole tab is arranged at one end of the conductive layer and located outside the base layer of the composite foil.

[0015] In a third aspect, the application provides a pole core, comprising a positive pole piece, a negative pole piece and a separator, at least one of the positive pole piece and the negative pole piece is any pole piece in the second aspect, and the separator is located between the positive pole piece and the negative pole piece.

[0016] In a possible implementation, the positive pole piece and the negative pole piece are arranged in sequence and in a staggered manner, and the separator is arranged between the positive pole piece and the negative pole piece.

[0017] In a possible implementation, both ends of the stacking direction of the positive pole piece and the negative pole piece are the separators, and the number of the positive pole pieces is one more than the number of the negative pole pieces.

[0018] In a possible implementation, the pole core comprises a first composite group and a positive pole piece, the first composite group is folded in a zigzag shape, and the positive pole piece is arranged at a folding seam of the first composite group.

[0019] The negative pole piece is located between two separators to form a first composite group.

[0020] In a possible implementation, the pole core comprises a second composite group, a third composite group and a separator, the separator is sequentially folded to form a plurality of accommodation grooves, and the second composite group and the third composite group are sequentially and spaced arranged in each accommodation groove.

[0021] The negative pole piece and the positive pole piece are arranged in sequence and in a staggered manner, and the separator is located between the positive pole piece and the negative pole piece to form the second composite group, and both ends of the stacking direction of the second composite group are the negative pole pieces.

[0022] The negative pole piece and the positive pole piece are arranged in sequence and in a staggered manner, and the separator is located between the positive pole piece and the negative pole piece to form the third composite group, and both ends of the stacking direction of the third composite group are the positive pole pieces.

[0023] And the stacking direction of the second composite group and the stacking direction of the third composite group are the same as the arrangement direction of the accommodation grooves.

[0024] In a fourth aspect, the application provides a manufacturing method of a pole core, at least two pole pieces in the second aspect are used, and the method comprises the following steps.

[0025] The pole pieces and the separator are sequentially placed to form a pole core group.

[0026] In a possible implementation, after the forming of the pole core group, the method further includes:

[0027] Cutting the pole core group at at least one preset interval of the pole pieces to form at least two single pole cores.

[0028] In a possible implementation, the sequentially placing the pole pieces and the separator includes:

[0029] The positive pole pieces and the negative pole pieces are sequentially and layerwisely placed, and the separator is placed between adjacent positive pole pieces and negative pole pieces, wherein the positive pole pieces and the negative pole pieces are the pole pieces.

[0030] In a possible implementation, the sequentially placing the pole pieces and the separator includes:

[0031] The negative pole pieces are layerwisely placed between two separators to form a first composite group;

[0032] The first composite group is folded in a zigzag shape;

[0033] The positive pole pieces are sequentially placed at the stacking seams of the first composite group to form a pole core group;

[0034] The positive pole pieces and the negative pole pieces are the pole pieces.

[0035] In a possible implementation, the sequentially placing the pole pieces and the separator includes:

[0036] The positive pole pieces and the negative pole pieces are sequentially and layerwisely placed, and a first separator is placed between adjacent positive pole pieces and negative pole pieces to form a second composite group, and both ends of the layering direction of the second composite group are the negative pole pieces;

[0037] The positive pole pieces and the negative pole pieces are sequentially and layerwisely placed, and the first separator is placed between adjacent positive pole pieces and negative pole pieces to form a third composite group, and both ends of the layering direction of the third composite group are the positive pole pieces;

[0038] A second separator is folded to form a plurality of accommodation grooves, the second composite group and the third composite group are sequentially and intervalwisely arranged in the accommodation grooves, and the layering direction of the first composite group is the same as the layering direction of the second composite group and the arrangement direction of the accommodation grooves to form a pole core group;

[0039] The positive pole pieces and the negative pole pieces are the pole pieces, and the first separator and the second separator are the separator.

[0040] In a fifth aspect, the application provides a battery, including a shell and the pole core in any of the third aspect.

[0041] Sixthly, this application provides an electrical device, including a device body and a battery as described in the fifth aspect above, disposed on the device body.

[0042] This application discloses a composite foil, electrode sheet, electrode core, and a method for manufacturing the electrode core. The composite foil includes a base layer and multiple conductive layers. Each conductive layer is disposed on two opposite surfaces of the base layer, with each conductive layer on the two surfaces of the base layer corresponding to the others. Conductive layers on the same surface are sequentially spaced along a predetermined direction, with a predetermined spacing between adjacent conductive layers. A cutting device can cut within this predetermined spacing, thus allowing only the base layer to be cut without cutting the conductive layers. This avoids dust and burrs generated after cutting the conductive layers. Furthermore, the projection of the base layer onto the conductive layers is located on both sides outside the conductive layers, preventing short circuits caused by contact between the conductive layers on both sides of the base layer, thereby improving battery safety. Attached Figure Description

[0043] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0044] Figure 1 This is a first-view structural schematic diagram of the composite foil provided in the embodiments of this application;

[0045] Figure 2 for Figure 1 A structural diagram from a second perspective;

[0046] Figure 3 for Figure 1 A structural diagram from a third-person perspective;

[0047] Figure 4 This is a schematic diagram of the structure of the electrode provided in the embodiments of this application;

[0048] Figure 5 This is a schematic diagram of the structure of the first type of electrode core provided in the embodiments of this application;

[0049] Figure 6 This is a schematic diagram of the structure of the second type of electrode core provided in the embodiments of this application;

[0050] Figure 7 for Figure 6 Schematic diagram of the structure of the first composite group;

[0051] Figure 8 This is a schematic diagram of the structure of the third type of electrode core provided in the embodiments of this application;

[0052] Figure 9 for Figure 8 Schematic diagram of the structure of the second composite group;

[0053] Figure 10 For Figure 8 Structure diagram of the third composite group;

[0054] Figure 11 Flow diagram of the first method for manufacturing the pole core provided by the embodiment of the present application;

[0055] Figure 12 Flow diagram of the second method for manufacturing the pole core provided by the embodiment of the present application;

[0056] Figure 13 Flow diagram of the third method for manufacturing the pole core provided by the embodiment of the present application.

[0057] The specific embodiments of the present application have been shown by the above-mentioned drawings, and will be described in more detail hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application by any means, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments.

[0058] Explanation of reference numerals:

[0059] 100 - composite foil; 110 - base layer; 120 - conductive layer;

[0060] 200 - pole piece; 210 - pole lug;

[0061] 300 - pole core;

[0062] 310 - positive pole piece; 320 - negative pole piece; 330 - separator; 331 - accommodating groove;

[0063] 340 - first composite group; 350 - second composite group; 360 - third composite group. DETAILED DESCRIPTION

[0064] The exemplary embodiments will be described in detail below with reference to the drawings. Unless otherwise indicated, the same numbers on the drawings indicate the same or similar elements. The embodiments described in the following exemplary embodiments are not meant to represent all implementations consistent with the present application. Rather, they are simply examples of apparatuses and methods consistent with some aspects of the present application as detailed in the appended claims.

[0065] In the prior art, the laminated battery includes a plurality of pole pieces. The pole pieces are formed by cutting on a composite foil. The composite foil includes an insulating layer and a conductive layer arranged on both sides of the insulating layer. When cutting, the insulating layer needs to be cut together with the metal layer. However, the metal layer has a large hardness, which is easy to cause damage to the cutting equipment, reduce the service life of the cutting equipment, and increase the cutting cost. At the same time, the metal layer generates a lot of dust and burrs after cutting, which causes the burrs of the metal layer on both sides of the insulating layer to be easy to contact and cause short circuit, resulting in inconsistent self-discharge rate of the battery.

[0066] Therefore, the embodiment of the present application provides a composite foil, which comprises a base layer and a plurality of conductive layers. Each conductive layer is arranged on the opposite two surfaces of the base layer, and each conductive layer on the two surfaces of the base layer is arranged one by one. The conductive layers on the same surface are arranged in sequence and at intervals along a preset direction, and the preset interval is provided between the adjacent two conductive layers. The cutting equipment can cut within the preset interval, so that only the base layer can be cut, and the conductive layer does not need to be cut, thereby avoiding the generation of dust and burrs after cutting of the conductive layer. At the same time, the projection of the base layer on the conductive layer is located on the outside of the conductive layer on both sides, avoiding the contact between the conductive layers on both surfaces of the base layer and causing short circuit, and improving the safety performance of the battery.

[0067] The embodiments of the present application will be described below with reference to the drawings.

[0068] Referring to Figures 1 to 3 The composite foil 100 provided by the embodiment of the present application comprises a base layer 110 and a plurality of conductive layers 120.

[0069] Each conductive layer 120 is arranged on the opposite two surfaces of the base layer 110, and each conductive layer 120 on the two surfaces of the base layer 110 is arranged one by one. The conductive layers 120 on the same surface are arranged in sequence and at intervals along a preset direction, and the preset interval is provided between the adjacent two conductive layers 120.

[0070] The base layer 110 is an insulating layer, and the base layer 110 can be made of polypropylene or polyethylene terephthalate.

[0071] The conductive layers 120 are parallel to each other, and the number of the conductive layers 120 can be adaptively set according to actual needs, which is not limited in the embodiment.

[0072] In specific use, the cutting equipment can cut within the preset interval to cut the composite foil 100, so as to form a sandwich structure in which the base layer 110 is located between the two conductive layers 120. Only the base layer 110 is provided within the preset interval, and no conductive layer 120 is provided, so that the cutting equipment only needs to cut the base layer 110, and does not need to cut the conductive layer 120.

[0073] Understandably, the preset spacing on the two surfaces of the base layer 110 corresponds one-to-one to facilitate cutting by the cutting equipment. The cutting equipment can be a blade or a laser device.

[0074] The composite foil provided in this application embodiment features a plurality of spaced conductive layers 120 on a base layer 110. A preset distance exists between adjacent conductive layers 120, allowing the cutting equipment to cut within this distance. This enables the cutting of only the base layer 110 without cutting the conductive layers 120, thus preventing dust and burrs from forming on the conductive layers 120 after cutting. Furthermore, the projection of the base layer 110 onto the conductive layers 120 is located on both sides of the conductive layers 120, preventing short circuits caused by contact between the conductive layers on both sides of the base layer 110, thereby improving battery safety. Compared to the conductive layers 120, the base layer 110 has lower hardness, facilitating cutting and minimizing impact on the lifespan of the cutting equipment, thus avoiding increased costs due to equipment damage.

[0075] Reference Figure 1 In some embodiments, the preset spacing is greater than or equal to 1 mm and less than or equal to 3 mm.

[0076] Among them, the preset spacing is Figure 1 In the L section, when the preset spacing is less than 1mm, the cutting equipment encounters difficulties when cutting at the preset spacing, and may cut into the conductive layer 120. When the preset spacing is greater than 3mm, the required area of ​​the base layer 110 is larger, resulting in higher costs for the base layer 110. Therefore, the preset spacing is set between 1mm and 3mm.

[0077] In practice, the thickness of the base layer 110 is greater than or equal to 2μm and less than or equal to 10μm.

[0078] The thickness of the base layer 110 is... Figure 3 h1 in the middle.

[0079] In a practical implementation, the thickness of the conductive layer 120 is greater than or equal to 1 μm and less than or equal to 5 μm.

[0080] The thickness of the conductive layer 120 is... Figure 3 h2 in the middle.

[0081] Reference Figure 3 In some examples, the width of the conductive layer 120 in a predetermined direction is... Figure 3 In the figure, b is greater than or equal to 2 mm and less than or equal to 10 mm. The width of the base layer 110 in the preset direction is... Figure 3 In the figure, a is greater than or equal to 20 mm and less than or equal to 400 mm.

[0082] Reference Figure 2The length of the conductive layer 120 and the base layer 110 in the preset direction is equal. Figure 2 H is greater than or equal to 200 mm and less than or equal to 1400 mm.

[0083] In a specific implementation, the conductive layer 120 is a copper foil layer or an aluminum foil layer.

[0084] The aluminum foil layer and the copper foil layer have good electrical conductivity and softness, can effectively transmit electrical energy, and do not have problems such as brittle fracture in the manufacturing process. In addition, the aluminum foil layer and the copper foil layer have good stability.

[0085] Referring to Figure 4 On the basis of the above embodiment, the application provides a pole piece 200, which includes a slurry layer and a composite foil 100. The slurry layer corresponds to covering the conductive layer 120 of the composite foil 100.

[0086] The specific structure of the composite foil 100 is described in detail in the above embodiment, which is not described here again.

[0087] The slurry layer includes a positive electrode slurry layer and a negative electrode slurry layer.

[0088] Specifically, the positive electrode slurry layer corresponds to covering the conductive layer 120 to form a positive electrode piece. After rolling the positive electrode piece, the positive electrode piece is cut within the preset interval of the composite foil 100 to form a single positive electrode piece. The negative electrode slurry layer corresponds to covering the conductive layer 120 to form a negative electrode piece. After rolling the negative electrode piece, the negative electrode piece is cut within the preset interval of the composite foil 100 to form a single negative electrode piece.

[0089] The pole piece 200 provided by the application includes the composite foil 100. The composite foil 100 is provided with a plurality of conductive layers 120 arranged at intervals on the base layer 110. The adjacent two conductive layers 120 have a preset interval, so that the cutting equipment can cut within the preset interval, thereby cutting only the base layer 110 without cutting the conductive layer 120, thereby avoiding the generation of dust and burrs after cutting the conductive layer 120. In addition, the projection of the base layer 110 on the conductive layer 120 is located on the outer side of the conductive layer 120, thereby avoiding the short circuit caused by the contact between the conductive layers on both sides of the base layer 110, and improving the safety performance of the battery. Compared with the conductive layer 120, the hardness of the base layer 110 is smaller, thereby facilitating the cutting of the cutting equipment and reducing the impact on the service life of the cutting equipment, thereby avoiding the increase in cost caused by the damage of the cutting equipment.

[0090] In a specific implementation, the pole piece 200 provided by the application further includes a tab 210. The tab 210 is arranged at one end of the conductive layer 120 and located on the outer side of the base layer 110 of the composite foil 100.

[0091] The tab 210 is a metal conductor for leading the positive and negative electrodes out of the electrode sheet 200.

[0092] In an example, the tab 210 is formed by die cutting at one end of the conductive layer 120, and the tab 210 is located outside the base layer 110 to facilitate electrical connection with other electrode sheets 200.

[0093] Referring to Figure 5 On the basis of the above embodiments, the electrode core provided by the embodiments of the present application includes a positive electrode sheet 310, a negative electrode sheet 320, and a separator 330. At least one of the positive electrode sheet 310 and the negative electrode sheet 320 is the electrode sheet 200, and the separator 330 is located between the positive electrode sheet 310 and the negative electrode sheet 320.

[0094] The structure of the electrode sheet 200 is described above and will not be repeated here.

[0095] The separator is arranged between the positive electrode sheet 310 and the negative electrode sheet 320 to isolate the positive electrode sheet 310 and the negative electrode sheet 320, prevent short circuiting of the positive electrode sheet 310 and the negative electrode sheet 320 due to contact, and ensure the safety and stability of the battery.

[0096] In some embodiments, the positive electrode sheet 310 and the negative electrode sheet 320 are arranged in sequence and in layers, and the separator 330 is arranged between the positive electrode sheet 310 and the negative electrode sheet 320.

[0097] Specifically, the positive electrode sheet 310, the negative electrode sheet 320, and the separator 330 are arranged in sequence and in layers, and the preset intervals on the positive electrode sheet 310 and the preset intervals on the negative electrode sheet 320 are one-to-one corresponding. Finally, the preset intervals are cut off to form a single electrode core 300.

[0098] In an example, the preset intervals can be cut off by heat cutting, so that the cut edges are hot-melted together to form a lock edge structure, so that the safety performance of the electrode core 300 is higher.

[0099] In a specific implementation, both ends of the layering direction of the positive electrode sheet 310 and the negative electrode sheet 320 are the separator 330, and the number of the positive electrode sheets 310 is one more than the number of the negative electrode sheets 320.

[0100] Specifically, the positive electrode sheet 310, the negative electrode sheet 320, and the separator 330 are arranged in sequence and in layers according to the order of “separator / negative electrode sheet / separator / positive electrode sheet / separator / negative electrode sheet / separator”. The number of the positive electrode sheets is m, the number of the negative electrode sheets is m+1, and the number of the separators is 2m+2.

[0101] During the layering process, the slurry layer of the positive electrode sheet 310 and the slurry layer of the negative electrode sheet 320 are corresponding and overlapped.

[0102] Referring to Figure 6 andFigure 7 In some embodiments, the polar core 300 provided by the embodiments of the present application comprises a first composite group 340 and a positive electrode sheet 310, the first composite group 340 is folded in a zigzag shape, and the positive electrode sheet 310 is arranged at the overlap seam of the first composite group 340. The negative electrode sheet 320 is located between two separators 330 to form the first composite group 340.

[0103] Specifically, the negative electrode sheet 320 and the separator 330 are stacked in the order of "separator / negative electrode sheet / separator" and are compounded together to form the first composite group 340. The first composite group 340 is folded in a zigzag shape along the preset interval on the negative electrode sheet 320 in the first composite group 340, and the positive electrode sheet 310 is arranged at the overlap seam to form the polar core 300.

[0104] Referring to Figure 8 , Figure 9 and Figure 10 In some embodiments, the polar core 300 provided by the embodiments of the present application comprises a second composite group 350, a third composite group 360 and a separator 330, the separator 330 is sequentially folded to form a plurality of accommodating grooves 331, and the second composite group 350 and the third composite group 360 are sequentially and spacedly arranged in each accommodating groove.

[0105] The negative electrode sheet 320 and the positive electrode sheet 310 are sequentially and spacedly stacked, and the separator 330 is located between the positive electrode sheet 310 and the negative electrode sheet 320 to form the second composite group 350, and the two ends of the stacking direction of the second composite group 350 are the negative electrode sheet 320.

[0106] The negative electrode sheet 320 and the positive electrode sheet 310 are sequentially and spacedly stacked, and the separator 330 is located between the positive electrode sheet 310 and the negative electrode sheet 320 to form the third composite group 360, and the two ends of the stacking direction of the third composite group 360 are the positive electrode sheet 310.

[0107] And the stacking direction of the second composite group 350 and the stacking direction of the third composite group 360 are the same as the arrangement direction of the accommodating groove 331.

[0108] Among them, the openings of the two adjacent accommodating grooves 331 face opposite directions. The two accommodating grooves 331 at the ends are both the second composite group 350.

[0109] Specifically, the positive electrode 310, negative electrode 320, and separator 330 are stacked sequentially in the order of "negative electrode / separator / positive electrode / separator / negative electrode / " to form a second composite group 350. The positive electrode 310, negative electrode 320, and separator 330 are then stacked sequentially in the order of "positive electrode / separator / negative electrode / separator / positive electrode" to form a third composite group 360. The second composite group 350 and the third composite group 360 are sequentially and alternately arranged in the receiving groove 331, and the stacking direction of the second composite group 350 is the same as the stacking direction of the third composite group 360, and also the same as the arrangement direction of the receiving groove 331.

[0110] Based on the above embodiments, this application also provides a battery, including a housing and an electrode core 300 disposed within the housing.

[0111] The battery is a stacked cell battery.

[0112] Based on the above embodiments, this application also provides an electrical device, including a device body and a battery disposed on the device body.

[0113] For example, the electrical equipment is a vehicle.

[0114] Figure 11 This is a schematic flowchart illustrating a first method for fabricating a electrode core according to an embodiment of this application. (Refer to...) Figure 11 This application provides a method for manufacturing an electrode core, using at least two electrode sheets, the method comprising:

[0115] S401. Place the electrode 200 and the separator 330 in sequence to form the electrode core assembly.

[0116] Specifically, the positive electrode 310 and the negative electrode 320 are first stacked sequentially, with a separator 330 placed between adjacent positive electrode 310 and negative electrode 320. That is, the positive electrode 310, negative electrode 320, and separator 330 are stacked in the order of "separator 330 / negative electrode 320 / separator 330 / positive electrode 310 / separator 330 / negative electrode 320 / separator 330" to form the electrode core assembly. The positive electrode 310 and the negative electrode 320 are electrode 200.

[0117] S402, Cut the electrode core group at at least one predetermined spacing of the electrode sheet 200 to form at least two individual electrode cores 300.

[0118] Figure 12 This is a schematic flowchart illustrating a second method for fabricating a electrode core, as provided in an embodiment of this application. (Refer to...) Figure 12 This application provides a method for manufacturing an electrode core, using at least two electrode sheets, the method comprising:

[0119] S501, stack the negative electrode sheet 320 between two separators 330 to form a first composite group 340.

[0120] The negative electrode sheet 320 is the electrode sheet 200. The negative electrode sheet 320 and the separator 330 are stacked in the order of "separator 330 / negative electrode sheet 320 / separator 330" and are compounded together to form the first composite group 340.

[0121] S502, fold the first composite group 340 in a Z shape.

[0122] Specifically, the first composite group 340 is folded in a Z shape along the preset intervals on the negative electrode sheet 320 in the first composite group 340.

[0123] S503, place the positive electrode sheet 310 at the stacking seam of the first composite group 340 in sequence to form an electrode core group.

[0124] The positive electrode sheet 310 is the electrode sheet 200.

[0125] Figure 13 The third method for manufacturing an electrode core provided in the embodiments of the present application is shown in the flowchart. Referring to Figure 13 The embodiments of the present application provide a method for manufacturing an electrode core, which uses at least two electrode sheets. The method comprises:

[0126] S601, stack the positive electrode sheet 310 and the negative electrode sheet 320 in sequence and place the first separator between the adjacent positive electrode sheet 310 and the negative electrode sheet 320 to form a second composite group 350, and both ends of the stacking direction of the second composite group 350 are negative electrode sheets 320.

[0127] The positive electrode sheet 310, the negative electrode sheet 320 and the separator 330 are stacked in sequence in the order of "negative electrode sheet 320 / separator 330 / positive electrode sheet 310 / separator 330 / negative electrode sheet 320 / ". The second composite group 350 is formed. The preset intervals on the positive electrode sheet 310 in the second composite group 350 correspond to the preset intervals on the negative electrode sheet 320 one by one, and the second composite group 350 is heat cut along the preset intervals to lock the edges of the second composite group 350.

[0128] S602, stack the positive electrode sheet 310 and the negative electrode sheet 320 in sequence and place the first separator between the adjacent positive electrode sheet 310 and the negative electrode sheet 320 to form a third composite group 360, and both ends of the stacking direction of the third composite group 360 are positive electrode sheets 310.

[0129] The positive electrode sheet 310, the negative electrode sheet 320, and the separator 330 are sequentially stacked in the order of "positive electrode sheet 310 / separator 330 / negative electrode sheet 320 / separator 330 / positive electrode sheet 310" to form a third composite group 360. The preset intervals on the positive electrode sheet 310 in the third composite group 360 correspond to the preset intervals on the negative electrode sheet 320 one by one, and the third composite group 360 is heat cut along the preset intervals to perform edge locking on the third composite group 360.

[0130] S603, the second separator is bent to form a plurality of accommodation grooves 331, the second composite group 350 and the third composite group 360 are sequentially and spacedly arranged in each accommodation groove 331, and the stacking direction of the second composite group 350 and the stacking direction of the third composite group 360 are the same as the arrangement direction of the accommodation groove 331 to form a core group.

[0131] The positive electrode sheet 310 and the negative electrode sheet 320 are the electrode sheet 200, and the first separator and the second separator are the separator 330.

[0132] The terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0133] In the embodiments of the present application, the terms "upper", "lower", "inner", "middle", "outer", "front", "back", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to indicating the orientation or positional relationship, the above-mentioned terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain attachment relationship or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the embodiments of the present application can be understood according to the specific circumstances.

[0134] In addition, the terms "set", "connected", "fixed" should be broadly understood. For example, "connected" can be fixedly connected, detachably connected, or integrally configured; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0135] The term "plurality" means two or more, unless otherwise indicated.

[0136] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope of the application being indicated only by the appended claims.

Claims

1. A composite foil material, characterized in that, include: A base layer (110) and multiple conductive layers (120); Each of the conductive layers (120) is respectively disposed on two opposite surfaces of the base layer (110), and each of the conductive layers (120) on the two surfaces of the base layer (110) is disposed in a one-to-one correspondence, and the conductive layers (120) located on the same surface are disposed sequentially at intervals along a preset direction; There is a predetermined spacing between two adjacent conductive layers (120); The preset spacing is greater than or equal to 1 mm and less than or equal to 3 mm.

2. The composite foil material according to claim 1, characterized in that, The thickness of the base layer (110) is greater than or equal to 2 μm and less than or equal to 10 μm.

3. The composite foil material according to claim 2, characterized in that, The thickness of the conductive layer (120) is greater than or equal to 1 μm and less than or equal to 5 μm.

4. The composite foil according to any one of claims 1-3, characterized in that, The conductive layer (120) is a copper foil layer or an aluminum foil layer.

5. An electrode sheet, characterized in that, It includes a slurry layer and a composite foil (100) as described in any one of claims 1-4, wherein the slurry layer is correspondingly covered on the conductive layer (120) of the composite foil (100).

6. The electrode sheet according to claim 5, characterized in that, It also includes a tab (210), which is disposed at one end of the conductive layer (120) and located on the outside of the base layer (110) of the composite foil (100).

7. A polar core, characterized in that, It includes a positive electrode (310), a negative electrode (320) and a separator (330), wherein at least one of the positive electrode (310) and the negative electrode (320) is an electrode (200) as described in claim 5 or 6, and the separator (330) is located between the positive electrode (310) and the negative electrode (320).

8. The electrode core according to claim 7, characterized in that, The positive electrode (310) and the negative electrode (320) are stacked in sequence at intervals, and the separator (330) is disposed between the positive electrode (310) and the negative electrode (320).

9. The electrode core according to claim 8, characterized in that, The positive electrode (310) and the negative electrode (320) are stacked at both ends of the separator (330), and the number of positive electrode (310) is one more than the number of negative electrode (320).

10. The electrode core according to claim 7, characterized in that, It includes a first composite group (340) and a positive electrode (310), wherein the first composite group (340) is folded in a Z-shape and the positive electrode (310) is disposed at the seam of the first composite group (340); The negative electrode (320) is located between the two separators (330) to form a first composite group (340).

11. The electrode core according to claim 7, characterized in that, It includes a second composite group (350), a third composite group (360) and a diaphragm (330), wherein the diaphragm (330) is bent in sequence to form a plurality of receiving grooves (331), and the second composite group (350) and the third composite group (360) are arranged in the receiving grooves in sequence at intervals; The negative electrode (320) and the positive electrode (310) are stacked in sequence at intervals, and the separator (330) is located between the positive electrode (310) and the negative electrode (320) to form the second composite group (350), and the two ends of the stacking direction of the second composite group (350) are the negative electrode (320). The negative electrode (320) and the positive electrode (310) are stacked in sequence at intervals, and the separator (330) is located between the positive electrode (310) and the negative electrode (320) to form the third composite group (360), and the two ends of the stacking direction of the third composite group (360) are the positive electrode (310). Furthermore, the stacking direction of the second composite group (350) and the stacking direction of the third composite group (360) are the same as the arrangement direction of the receiving groove (331).

12. A method for manufacturing an electrode core, characterized in that, The method, employing at least two of the electrode sheets (200) as described in claim 5 or 6, comprises: The electrode (200) and the diaphragm (330) are placed in sequence to form an electrode core assembly.

13. The method according to claim 12, characterized in that, After forming the pole core assembly, the process further includes: The electrode core assembly is cut at at least one predetermined spacing of the electrode sheet (200) to form at least two individual electrode cores (300).

14. The method according to claim 13, characterized in that, The step of sequentially placing the electrode (200) and the diaphragm (330) includes: The positive electrode (310) and the negative electrode (320) are stacked in sequence, and the separator (330) is placed between adjacent positive electrode (310) and negative electrode (320), wherein the positive electrode (310) and the negative electrode (320) are the electrode (200).

15. The method according to claim 12, characterized in that, The step of sequentially placing the electrode (200) and the diaphragm (330) includes: The negative electrode (320) is stacked between the two separators (330) to form a first composite group (340). The first composite group (340) is folded in a Z-shape; The positive electrode sheet (310) is placed sequentially at the seam of the first composite group (340) to form the electrode core group; The positive electrode (310) and the negative electrode (320) are the electrode (200).

16. The method according to claim 12, characterized in that, The step of sequentially placing the electrode (200) and the diaphragm (330) includes: A positive electrode (310) and a negative electrode (320) are stacked in sequence, and a first separator is placed between adjacent positive electrode (310) and negative electrode (320) to form a second composite group (350), and both ends of the stacking direction of the second composite group (350) are the negative electrode (320). The positive electrode (310) and the negative electrode (320) are stacked in sequence, and the first separator is placed between adjacent positive electrode (310) and negative electrode (320) to form a third composite group (360), and both ends of the stacking direction of the third composite group (360) are the positive electrode (310). The second diaphragm is bent to form a plurality of receiving grooves (331). The second composite group (350) and the third composite group (360) are sequentially spaced in each receiving groove (331), and the stacking direction of the second composite group (350) and the stacking direction of the third composite group (360) are the same as the arrangement direction of the receiving grooves (331) to form an electrode core (300) group. Wherein, the positive electrode (310) and the negative electrode (320) are the electrode (200), and the first diaphragm and the second diaphragm are both the diaphragm (330).

17. A battery, characterized in that, It includes a housing and an electrode core (300) as described in any one of claims 7 to 11 disposed within the housing.

18. An electrical appliance, characterized in that, It includes the device body and the battery as described in claim 17 disposed on the device body.

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