Battery pole piece, bare cell, manufacturing method of laminated battery, laminated battery and electronic device

Abstract

The application provides a battery pole piece, a bare battery cell, a manufacturing method of a laminated battery cell, the laminated battery cell and an electronic device. The battery pole piece comprises a current collector, a plurality of pole piece material layers and a plurality of insulating layers arranged on the surface of the current collector. The plurality of pole piece material layers and the plurality of insulating layers are alternately distributed along the length direction of the current collector. When the battery pole piece is used to wind a bare battery cell with a predetermined specification, the plurality of insulating layers are all located in the R corner area of the bare battery cell. Through the arrangement, the R corner can be cut off after the battery pole piece is wound to form the bare battery cell, and the laminated battery cell is prepared. The production process of the laminated battery cell is simplified, the production yield is improved, and the production equipment investment and production cost are greatly reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a method for manufacturing battery electrodes, bare cells, stacked batteries, stacked batteries, and electronic devices. Background Technology

[0002] With the advancement of technology, electronic products are becoming increasingly widespread, and the normal use of these products is inseparable from batteries. In existing electronic products, most batteries have a wound structure. Due to inherent design flaws, the rounded corners on both sides of the battery cell occupy part of the battery space, resulting in gaps between the rounded corners of the finished battery cell and the casing. This leads to wasted battery volume and lower energy density in wound-structured batteries, which cannot meet user needs.

[0003] Stacked cells effectively utilize the space at the R-angles on both sides of the cell, thereby increasing the energy density of the cell. Currently, there are two types of stacked cells: E-shaped and Z-shaped. However, the production equipment for these two types of cells requires a huge investment, the production process is complex, and the production yield is low. Summary of the Invention

[0004] In view of this, this application provides a method for manufacturing battery electrodes, bare cells, stacked batteries, stacked batteries, and electronic devices, which can simplify the production process and improve battery energy density.

[0005] Specifically, the following technical solutions are included:

[0006] In a first aspect, embodiments of this application provide a battery electrode, the battery electrode comprising a current collector and a plurality of electrode material layers and a plurality of insulating layers disposed on the surface of the current collector, the plurality of electrode material layers and the plurality of insulating layers being alternately distributed along the length direction of the current collector;

[0007] In this case, when the battery electrode is used to wind into a bare cell of a predetermined specification, multiple insulating layers are located in the R-corner region of the bare cell.

[0008] In an optional embodiment, the insulating layer extends along the width direction of the current collector, and the linear dimension of the insulating layer in the width direction of the current collector is greater than or equal to the linear dimension of the electrode material layer in the width direction of the current collector.

[0009] This design ensures that the insulating layer fully covers the side of the electrode material layer closest to the insulating layer, thus improving the insulation effect.

[0010] In an optional embodiment, the insulating layer is an insulating ceramic layer.

[0011] This design improves the stability and safety of the battery electrodes. Insulating ceramics have advantages such as high temperature resistance, good insulation performance, wear resistance, corrosion resistance, and fire retardancy, and have excellent mechanical strength and chemical stability.

[0012] In an optional embodiment, along the length direction of the current collector, the width of a plurality of insulating layers located outside the ends of the current collector gradually increases.

[0013] This design, combined with the layer-by-layer winding of the battery electrode, ensures that the R-corner portion of the battery electrode only contains current collectors and insulating layers, without any electrode material layer. This prevents the electrode material layer from being cut off when the R-corner is cut, thus avoiding short circuits and wasting electrode material.

[0014] In an optional embodiment, the plurality of electrode material layers are all identical in shape and size, and on one side of the current collector thickness direction, the plurality of electrode material layers are provided with tabs.

[0015] This design ensures that the electrode material layers are located on flat areas and not at the R-corner areas, thus preventing the electrode material layers from being cut off when the R-corner is cut, avoiding short circuits and wasting electrode material; it also ensures that each layer of battery electrode in the stacked battery formed after the R-corner is cut off has a tab, so that multiple tabs can be welded in parallel, reducing internal resistance and improving the heat dissipation of the stacked battery during use.

[0016] Secondly, embodiments of this application provide a bare battery cell, the bare battery cell including a positive electrode sheet, a negative electrode sheet and a separator, wherein the positive electrode sheet and the negative electrode sheet are battery electrode sheets provided in any embodiment of the first aspect;

[0017] The positive electrode, the separator, and the negative electrode are stacked and wound to form the bare cell. The bare cell has a flat region and two R-corner regions. The two R-corner regions are located at both ends of the width direction of the flat region and are both bent. The insulating layer of the positive electrode and the insulating layer of the negative electrode are at least partially located in the R-corner regions. The electrode material layer of the positive electrode and the electrode material layer of the negative electrode are both located in the flat region.

[0018] With this setup, after removing at least part of the R-corner area, the remaining part of the bare cell can be processed in a small amount to obtain a stacked battery, forming a stacked battery manufacturing process route that is different from the E-shaped and Z-shaped stacked batteries in the prior art, which greatly simplifies the production process; and compared with the wound battery in the technology, this stacked battery manufacturing process also improves the internal space utilization and energy density of the battery.

[0019] In an optional embodiment, a plurality of the electrode material layers are stacked in the flat region and aligned at their edges.

[0020] This setting improves the consistency of bare cells and prevents internal short circuits caused by overlapping of adjacent electrode material layers after the R-corner area of ​​the bare cell is removed.

[0021] Thirdly, embodiments of this application provide a method for manufacturing a stacked battery, the method comprising:

[0022] A bare cell is formed by stacking and winding a positive electrode sheet, a separator, and a negative electrode sheet, wherein the bare cell is the bare cell provided in any embodiment of the second aspect;

[0023] The R-corner area of ​​the bare battery cell is removed.

[0024] In an optional embodiment, the step of cutting off the R-corner region of the bare battery cell specifically includes:

[0025] At least a portion of each of the R-corner regions is removed along the thickness direction of the bare cell so that at least one end of each of the electrode material layers is connected to the insulating layer in the width direction of the bare cell.

[0026] In an optional embodiment, after removing the R-corner region of the bare battery cell, the manufacturing method further includes:

[0027] Adhesive is applied to the cut surface of the bare battery cell.

[0028] Fourthly, embodiments of this application provide a stacked battery, which is manufactured using the manufacturing method provided in any of the embodiments of the third aspect.

[0029] Fifthly, embodiments of this application provide an electronic device, which includes the stacked battery provided in the fourth aspect embodiment.

[0030] The beneficial effects of the technical solution provided in this application include at least the following: by setting multiple electrode material layers and multiple insulating layers alternately distributed along the length direction of the current collector, and making the insulating layer suitable for being located in the bent R-corner area when the battery electrode is wound, the R-corner area can be cut off after the battery electrode is wound into a bare cell of predetermined specifications to prepare a stacked battery. This not only simplifies the production process of stacked batteries and helps to improve the production yield, but also greatly reduces the investment in production equipment and production costs. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1This is a side view of a battery electrode provided in an embodiment of this application;

[0033] Figure 2 A top view of the battery electrode provided in an embodiment of this application;

[0034] Figure 3 A schematic diagram showing the arrangement of the positive electrode, negative electrode, and separator in the bare cell provided in this application embodiment when it is not wound.

[0035] Figure 4 This is a schematic diagram of the structure of a bare battery cell provided in an embodiment of this application;

[0036] Figure 5 for Figure 4 A schematic diagram of the structure of a bare battery cell after the R-corner region has been removed;

[0037] Figure 6 This is a schematic flowchart illustrating a method for manufacturing a stacked battery according to some embodiments of this application;

[0038] Figure 7 This is a schematic flowchart illustrating a method for manufacturing a stacked battery according to other embodiments of this application.

[0039] The reference numerals in the figure indicate:

[0040] 1-Battery electrode; 11-Current collector; 12-Electrode material layer; 13-Insulating layer; 14-Taper;

[0041] 2-Bare cell; 21-Positive electrode plate; 211-Positive tab; 22-Negative electrode plate; 221-Negative tab; 23-Separator; 24-Straight region; 25-R-angle region.

[0042] The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0043] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] In the embodiments of this application, directional terms such as "upper," "lower," and "side" are generally used in the following ways: Figure 1The relative positions shown are based on the given information, and these directional terms are used only to more clearly describe the relationships between structures, not to describe absolute positions. Positions may change when the product is placed in different orientations; for example, "up" and "down" may be interchanged.

[0045] Unless otherwise defined, all technical terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art.

[0046] With the advancement of technology, electronic products are becoming increasingly widespread, and the normal use of these products is inseparable from batteries. In existing electronic products, most batteries have a wound structure. Due to inherent design flaws, the rounded corners on both sides of the battery cell occupy part of the battery space, resulting in gaps between the rounded corners of the finished battery cell and the casing. This leads to wasted battery volume and lower energy density in wound-structured batteries, which cannot meet user needs.

[0047] Stacked cells effectively utilize the space at the R-angles on both sides of the cell, thereby increasing the energy density of the cell. Currently, there are two types of stacked cells: E-shaped and Z-shaped. However, the production equipment for these two types of cells requires a huge investment, the production process is complex, and the production yield is low.

[0048] To address the aforementioned technical problems, this application provides a method for manufacturing battery electrode 1, bare cell 2, stacked battery, and stacked battery.

[0049] like Figure 1 As shown, the battery electrode 1 provided in this embodiment includes a current collector 11 and a plurality of electrode material layers 12 and a plurality of insulating layers 13 disposed on the surface of the current collector 11. The plurality of electrode material layers 12 and the plurality of insulating layers 13 are alternately distributed along the length direction of the current collector 11. When the battery electrode 1 is used to be wound into a bare cell 2 of a predetermined specification, the plurality of insulating layers 13 are all located in the R-corner region 25 of the bare cell 2.

[0050] For example, the electrode material layer 12 and the insulating layer 13 are coated on the surface of the current collector 11.

[0051] It is understandable that, for the battery electrode 1 to be used in winding into a bare cell 2 of a predetermined specification, multiple insulating layers 13 are located in the R-corner region 25 of the bare cell 2. Therefore, the arrangement of the electrode material layer 12 and the insulating layer 13 needs to meet certain dimensional requirements, which can be obtained through calculation and experimentation. Generally, a battery electrode 1 of one specification can only be used to manufacture a bare cell 2 of one specification. Different specifications of bare cells 2 require different specifications of battery electrode 1, but such battery electrode 1 all fall within the protection scope of this application.

[0052] In this application, the terms "electrode material layer 12" and "insulating layer 13" are used because after the battery electrode 1 is wound into a bare cell 2, the electrode material layer 12 and the insulating layer 13 are in a stacked state. However, in the unwound battery electrode 1, the electrode material layer 12 and the insulating layer 13 are in a flat state and do not form a stacked state. Therefore, they can also be referred to as the electrode material area and the insulating area. In other words, the term "layer" here does not mean that the electrode material layer 12 and the insulating layer 13 are in a stacked state in the battery electrode 1. The current collector 11 is rectangular in shape, and the electrode material layer 12 and the insulating layer 13 are both disposed on two surfaces of the current collector 11 that are opposite to each other along the thickness direction.

[0053] For example, such as Figure 1 As shown, multiple electrode material layers 12 and multiple insulating layers 13 are symmetrically distributed along the thickness direction of the current collector 11.

[0054] Along the length of the current collector 11, multiple electrode material layers 12 and multiple insulating layers 13 are alternately distributed, meaning that an insulating layer 13 is present between every two adjacent electrode material layers 12. Adjacent insulating layers 13 and electrode material layers 12 can be spaced apart or closely adjacent, for example... Figure 1 As shown, the adjacent insulating layer 13 is in close proximity to the electrode material layer 12.

[0055] The battery electrode 1 can be either a positive electrode 21 or a negative electrode 22. When the battery electrode 1 is a positive electrode 21, the electrode material layer 12 is a positive active material layer, and the current collector 11 is an aluminum foil. When the battery electrode 1 is a negative electrode 22, the electrode material layer 12 is a negative active material layer, and the current collector 11 is a copper foil. The electrode material layer 12 includes active materials, binders, conductive agents, and other materials.

[0056] The insulating layer 13 is made of insulating material. After the positive and negative battery electrodes 1 and the separator 23 are wound along the length of the battery electrode 1 using a winding process, the insulating layer 13 is located at the bent R-angle, while the electrode material layer 12 is located on the flat part outside the R-angle, forming a bare cell 2. Then, after hot pressing the bare cell 2, the R-angle is cut off. The bare cell 2 is then subjected to processes such as adhesive bonding and encapsulation into a shell to obtain a new type of stacked battery. This forms a stacked battery manufacturing process route that is different from the existing E-shaped and Z-shaped stacked batteries, greatly simplifying the production process. Moreover, compared with the wound batteries in the technology, this stacked battery manufacturing process also improves the internal space utilization and energy density of the battery.

[0057] For example, after the R-angle of the bare cell 2 is cut off, the cut surfaces on both sides of the bare cell 2 have an insulating layer 13 to prevent short circuits of adjacent battery electrodes 1.

[0058] For example, an insulating material is coated into the gaps of the electrode material layer 12 using an irregularly shaped coating method to form an insulating layer 13. A dual-cavity coating die can also be used for coating, simultaneously coating different slurries to improve coating accuracy and better bonding between different slurries.

[0059] The battery electrode 1 provided in this application embodiment has multiple electrode material layers 12 and multiple insulating layers 13 alternately distributed along the length direction of the current collector 11. The insulating layer 13 is suitable to be located in the bent R-corner region 25 when the battery electrode 1 is wound. The R-corner region 25 can be cut off after the battery electrode 1 is wound into a bare cell 2 of a predetermined specification to prepare a stacked battery. This not only simplifies the production process of stacked batteries and helps to improve the production yield, but also greatly reduces the investment in production equipment and production costs.

[0060] In a further embodiment, the insulating layer 13 extends along the width direction of the current collector 11, and the linear dimension of the insulating layer 13 in the width direction of the current collector 11 is greater than or equal to the linear dimension of the electrode material layer 12 in the width direction of the current collector 11.

[0061] For example, such as Figure 2 As shown, the vertical direction is the width direction of the current collector 11, and the horizontal direction is the length direction of the current collector 11. The electrode material layer 12 and the insulating layer 13 are both rectangularly coated on the surface of the current collector 11. The linear dimension of the insulating layer 13 in the width direction of the current collector 11 is equal to the linear dimension of the electrode material layer 12 in the width direction of the current collector 11.

[0062] This arrangement ensures that the insulating layer 13 fully covers the side of the electrode material layer 12 closest to the insulating layer 13, guaranteeing insulation and effectively preventing short circuits between adjacent battery electrodes 1 in the bare cell 2 after the R-angle is cut.

[0063] In one specific embodiment, the insulating layer 13 is an insulating ceramic layer, which is formed by coating with an insulating ceramic coating.

[0064] Insulating ceramics have advantages such as high temperature resistance, good insulation performance, wear resistance, corrosion resistance, fire resistance and flame retardancy, and have excellent mechanical strength and chemical stability.

[0065] In this embodiment, by setting the insulating layer 13 as an insulating ceramic layer, it is beneficial to improve the stability and safety of the battery electrode 1.

[0066] In addition, the insulation layer 13 can also be made of insulating materials such as insulating adhesive, which facilitates construction.

[0067] In one embodiment, along the length of the current collector 11, the width of a plurality of insulating layers 13 located outside the end of the current collector 11 gradually increases.

[0068] like Figure 2 As shown, the width of the multiple insulating layers 13 gradually increases from left to right. It can be understood that the width of the insulating layer 13 is a linear dimension of the insulating layer 13 along the length direction of the current collector 11.

[0069] As the battery electrode 1 is wound, the outer layer of the R-corner portion has a larger area than the inner layer. By setting multiple insulating layers 13 with gradually increasing linear dimensions in the length direction of the current collector 11, the area of ​​the multiple insulating layers 13 gradually increases. This, in conjunction with the layer-by-layer winding of the battery electrode 1, ensures that the R-corner portion of the battery electrode 1 only has the current collector 11 and the insulating layer 13, without the electrode material layer 12. This prevents the electrode material layer 12 from being cut off when the R-corner is cut, avoiding short circuits and waste of electrode material.

[0070] For example, the multiple electrode material layers 12 have the same shape and size, such as Figure 1 As shown, on one side of the current collector 11 in the thickness direction, multiple electrode material layers 12 are provided with tabs 14.

[0071] By setting multiple electrode material layers 12 to have the same shape and size, after the battery electrode 1 is wound, the multiple electrode material layers 12 can be stacked with their edges flush, ensuring that the electrode material layers 12 are all located in the flat part and not in the R-corner part, thereby preventing the electrode material layer 12 from being cut off when the R-corner is cut, avoiding short circuit and waste of electrode material.

[0072] By providing tabs 14 on each of the multiple electrode material layers 12 on one side of the current collector 11 in the thickness direction, each layer of battery electrode 1 formed after the R-corner portion is removed has tabs 14, so that multiple tabs 14 can be welded in parallel in the future, reducing internal resistance and improving the heat dissipation of the stacked battery during use.

[0073] For example, when the battery electrode 1 is a positive electrode 21, the electrode material layer 12 is provided with a positive electrode tab 211, which is made of aluminum; when the battery electrode 1 is a negative electrode 22, the electrode material layer 12 is provided with a negative electrode tab 221, which is made of nickel.

[0074] This application embodiment also provides a bare battery cell 2, such as Figure 3 and Figure 4 As shown, the bare cell 2 includes a positive electrode 21, a negative electrode 22 and a separator 23. The positive electrode 21 and the negative electrode 22 are both battery electrode 1 provided in any of the above embodiments.

[0075] A positive electrode 21, a separator 23, and a negative electrode 22 are stacked and wound to form a bare cell 2. The bare cell 2 has a flat region 24 and two R-angle regions 25. The two R-angle regions 25 are located at both ends of the width direction of the flat region 24 and are both bent. The insulating layer 13 of the positive electrode 21 and the insulating layer 13 of the negative electrode 22 are at least partially located in the R-angle region 25. The electrode material layer 12 of the positive electrode 21 and the electrode material layer 12 of the negative electrode 22 are both located in the flat region 24.

[0076] It is understandable that the electrode material layer 12 of the positive electrode 21 is the positive active material layer, and the current collector 11 is aluminum foil; the electrode material layer 12 of the negative electrode 22 is the negative active material layer, and the current collector 11 is copper foil.

[0077] Optionally, if the insulating layer 13 of the positive electrode 21 and the insulating layer 13 of the negative electrode 22 are both located entirely in the R-corner region 25, then the flat region 24 has an active material layer but no insulating layer 13; or, if the insulating layer 13 of the positive electrode 21 and the insulating layer 13 of the negative electrode 22 are partly located in the R-corner region 25 and partly located in the flat region 24, then the flat region 24 has not only an active material layer but also an insulating layer 13.

[0078] Figure 3 The diagram illustrates the arrangement of the positive electrode 21, negative electrode 22, and separator 23 in some embodiments of this application when not wound. There are two separators 23. The positive electrode 21, negative electrode 22, and separator 23 are stacked sequentially in the order of positive electrode 21—separator 23—negative electrode 22—separator 23, and wound in a direction that allows the negative electrode 22 to cover the positive electrode 21 to prevent lithium plating. The specific dimensions of the positive electrode 21 and negative electrode 22 can be set according to actual needs; the length and width of the negative electrode 22 can be greater than the length and width of the positive electrode 21, respectively.

[0079] The separator 23 separates the positive electrode 21 and the negative electrode 22 to prevent short circuits caused by contact between the two electrodes, while allowing electrolyte ions to pass through to ensure safe battery operation.

[0080] After winding the positive electrode 21, the negative electrode 22, and the separator 23, a Figure 4 The bare battery cell 2 shown is... Figure 4 The horizontal direction is the width direction of the bare cell 2 and the straight area 24, and the vertical direction is the thickness direction of the bare cell 2.

[0081] like Figure 4 As shown, there are two R-angle regions 25, which are located at the left and right ends of the straight region 24, respectively. The straight region 24 is flat, while the R-angle region 25 is curved.

[0082] like Figure 5As shown, since both the electrode material layer 12 of the positive electrode 21 and the electrode material layer 12 of the negative electrode 22 are located in the flat region 24, the electrode material layer 12 can be avoided from being cut when the R-corner region 25 is removed, preventing short circuits and waste of electrode material. After at least part of the R-corner region 25 is removed, the remaining part of the bare cell 2 is processed in a small amount to obtain a stacked battery, forming a stacked battery manufacturing process route different from the E-shaped and Z-shaped stacked batteries in the prior art, which greatly simplifies the production process; and compared with the wound battery in the technology, this stacked battery manufacturing process also improves the internal space utilization and energy density of the battery.

[0083] During the cutting process, all of each R-corner area 25 can be cut off, or a portion of each R-corner area 25 can be cut off, or one R-corner area 25 can be completely cut off and a portion of another R-corner area 25 can be cut off.

[0084] The bare cell 2 provided in this application embodiment has the following features: the insulating layer 13 of the positive electrode 21 and the insulating layer 13 of the negative electrode 22 are both located in the R-corner region 25, and the electrode material layer 12 of the positive electrode 21 and the electrode material layer 12 of the negative electrode 22 are both located in the flat region 24. This facilitates the removal of at least part of the R-corner region 25 after winding, thereby preparing the bare cell 2 into a stacked battery. This not only simplifies the production process of stacked batteries and helps to improve the production yield, but also greatly reduces the investment in production equipment and production costs.

[0085] In a further embodiment, a plurality of electrode material layers 12 are stacked in the flat region 24 and aligned at the edges.

[0086] like Figure 4 or Figure 5 As shown, multiple electrode material layers 12 are stacked along the thickness direction of the bare cell 2, and the left and right edges of the multiple electrode material layers 12 are arranged flush.

[0087] In this embodiment, the multiple electrode material layers 12 have the same shape and size. By setting the edges of the multiple electrode material layers 12 to be flush, it is beneficial to improve the consistency of the bare cell 2, and at the same time prevent the adjacent electrode material layers 12 from overlapping and causing an internal short circuit after the bare cell 2 has the R-corner area 25 cut off.

[0088] The positive electrode 21 is provided with a positive electrode tab 211, and the negative electrode 22 is provided with a negative electrode tab 221. In the positive electrode 21, multiple electrode material layers 12 on one side of the current collector 11 in the thickness direction are provided with positive electrode tabs 211; in the negative electrode 22, multiple electrode material layers 12 on one side of the current collector 11 in the thickness direction are provided with negative electrode tabs 221.

[0089] This configuration ensures that each layer of battery electrode 1 formed after the R-corner region 25 is removed has a tab 14, so that multiple tabs 14 can be welded in parallel to reduce internal resistance and improve the heat dissipation of the stacked battery during use.

[0090] like Figure 6 As shown in the embodiments of this application, a method for manufacturing a stacked battery is also provided, the method comprising:

[0091] S1: The positive electrode 21, the separator 23 and the negative electrode 22 are stacked and wound to form a bare cell 2, wherein the bare cell 2 is the bare cell 2 provided in any of the above embodiments;

[0092] S2: Cut off the R-corner area 25 of bare cell 2.

[0093] In step S1, after stacking the positive electrode 21, the separator 23, and the negative electrode 22 to form the object to be wound, the object is wound manually or using a winding device, starting from one end, thereby forming... Figure 4 The bare cell 2 is shown. The bare cell 2 has a flat region 24 and two R-angle regions 25. The two R-angle regions 25 are located at both ends of the width direction of the flat region 24 and are both bent. The insulating layer 13 of the positive electrode 21 and the insulating layer 13 of the negative electrode 22 are at least partially located in the R-angle regions 25. The electrode material layer 12 of the positive electrode 21 and the electrode material layer 12 of the negative electrode 22 are both located in the flat region 24.

[0094] In step S2, the two R-corner regions 25 of the bare cell 2 are removed, thereby removing at least a portion of the insulating layer 13 in the R-corner regions 25. Since the electrode material layer 12 of the positive electrode 21 and the electrode material layer 12 of the negative electrode 22 are both located in the flat region 24, the electrode material layer 12 can be avoided from being removed when the R-corner regions 25 are cut, thus preventing short circuits and waste of electrode material.

[0095] The method for manufacturing stacked batteries provided in this application embodiment first winds to form bare cells 2 and then cuts off the R-corner area 25, forming a stacked battery manufacturing process route different from the E-shaped and Z-shaped stacked batteries in the prior art, which greatly simplifies the production process; and compared with the wound batteries in the technology, the stacked batteries made by this manufacturing method improve the internal space utilization and energy density.

[0096] Optionally, before step S2, the method further includes:

[0097] S20: Hot-press the bare cell 2.

[0098] Hot pressing can soften the battery electrode 1, making it easier to insert into the casing, and ensure a tight bond between the interfaces of the battery electrode 1, enhancing the compaction effect, improving the space utilization and lifespan of the battery, and also improving the safety of stacked batteries and reducing the risk of internal short circuits.

[0099] In a specific embodiment, step S2 involves cutting off the R-corner region 25 of the bare cell 2, specifically including:

[0100] At least a portion of each R-corner region 25 is cut off along the thickness direction of the bare cell 2 so that at least one end of each electrode material layer 12 in the width direction of the bare cell 2 is connected to the insulating layer 13.

[0101] Through this setting, such as Figure 5 As shown, at least one end of the bare cell 2 retains a portion of the insulating layer 13 in the width direction, so that each electrode material layer 12 is connected to the insulating layer 13 at at least one end in the width direction of the bare cell 2. This greatly reduces the short circuit risk of the positive electrode 21 and the negative electrode 22, and eliminates the need for additional insulation treatment of the positive electrode 21 and the negative electrode 22, which is beneficial to improving production efficiency.

[0102] Furthermore, such as Figure 7 As shown, after step S3, the method for manufacturing a stacked battery further includes:

[0103] S3: Apply adhesive to the cut surface of bare cell 2.

[0104] For example, adhesive materials such as double-sided tape, hot melt adhesive, silicone, epoxy resin adhesive or UV-curable adhesive are used to apply adhesive to the cut surface of the bare battery cell 2 to prevent the cut surface of the bare battery cell 2 from spreading out, thereby fixing the battery electrode 1, preventing short circuits, facilitating casing installation and improving safety performance.

[0105] It is understandable that after step S3, the manufacturing method of stacked batteries also includes conventional processes such as casing, electrolyte injection, cleaning, post-processing, and assembly, which will not be described in detail here.

[0106] This application also provides a stacked battery, which is manufactured using the stacked battery manufacturing method provided in any of the above embodiments.

[0107] The stacked battery provided in this application embodiment greatly simplifies the production process and significantly reduces the production cost of stacked batteries compared to existing stacked batteries; compared to existing wound batteries, it has higher internal space utilization and energy density.

[0108] This application also provides an electronic device, which includes the stacked battery provided in the above embodiments.

[0109] Electronic devices include, but are not limited to, mobile phones, laptops, tablets, e-book readers, wearable devices, navigators, handheld game consoles, virtual and reality devices, and augmented reality devices.

[0110] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0111] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only.

[0112] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A battery electrode (1), characterized in that, The battery electrode (1) includes a current collector (11) and a plurality of electrode material layers (12) and a plurality of insulating layers (13) disposed on the surface of the current collector (11), wherein the plurality of electrode material layers (12) and the plurality of insulating layers (13) are alternately distributed along the length direction of the current collector (11); When the battery electrode (1) is used to wind into a bare cell (2) of a predetermined specification, the plurality of insulating layers (13) are located in the R-corner region (25) of the bare cell (2).

2. The battery electrode (1) according to claim 1, characterized in that, The insulating layer (13) extends along the width direction of the current collector (11), and the linear dimension of the insulating layer (13) in the width direction of the current collector (11) is greater than or equal to the linear dimension of the electrode material layer (12) in the width direction of the current collector (11).

3. The battery electrode (1) according to claim 1, characterized in that, The insulating layer (13) is an insulating ceramic layer.

4. The battery electrode (1) according to claim 1, characterized in that, Along the length direction of the current collector (11), the width of the insulating layer (13) located in the region outside the end of the current collector (11) gradually increases.

5. The battery electrode (1) according to claim 4, characterized in that, The multiple electrode material layers (12) are all the same in shape and size. On one side of the current collector (11) in the thickness direction, the multiple electrode material layers (12) are provided with tabs (14).

6. A bare battery cell (2), characterized in that, The bare cell (2) includes a positive electrode (21), a negative electrode (22) and a separator (23), wherein the positive electrode (21) and the negative electrode (22) are both battery electrode (1) according to any one of claims 1 to 5; The positive electrode (21), the separator (23), and the negative electrode (22) are stacked and wound to form the bare cell (2). The bare cell (2) has a flat region (24) and two R-corner regions (25). The two R-corner regions (25) are located at both ends of the width direction of the flat region (24) and are both bent. The insulating layer (13) of the positive electrode (21) and the insulating layer (13) of the negative electrode (22) are at least partially located in the R-corner region (25). The electrode material layer (12) of the positive electrode (21) and the electrode material layer (12) of the negative electrode (22) are both located in the flat region (24).

7. The bare battery cell (2) according to claim 6, characterized in that, Multiple electrode material layers (12) are stacked in the flat region (24) with their edges aligned.

8. A method for manufacturing a stacked battery, characterized in that, The manufacturing method includes: A bare cell (2) is formed by stacking and winding a positive electrode (21), a separator (23) and a negative electrode (22), wherein the bare cell (2) is the bare cell (2) as described in claim 6 or 7; The R-corner region (25) of the bare cell (2) is cut off.

9. The method for manufacturing a stacked battery according to claim 8, characterized in that, The step of cutting off the R-corner region (25) of the bare battery cell (2) specifically includes: At least a portion of each of the R-corner regions (25) is cut off along the thickness direction of the bare cell (2) so that each of the electrode material layers (12) is connected to the insulating layer (13) at least one end in the width direction of the bare cell (2).

10. The method for manufacturing a stacked battery according to claim 9, characterized in that, After the R-corner region (25) of the bare battery cell (2) is removed, the manufacturing method further includes: Adhesive is applied to the cut surface of the bare battery cell (2).

11. A stacked battery, characterized in that, The stacked battery is manufactured using the manufacturing method described in any one of claims 8 to 10.

12. An electronic device, characterized in that, The electronic device includes the stacked battery of claim 11.

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