Battery and electronic equipment

Abstract

The utility model provides a battery and electronic equipment, the battery comprises a pole piece, an inner tab, an aluminum plastic film, an outer tab and an electrolyte, the first end of the inner tab is electrically connected with the pole piece, and the second end of the inner tab is electrically connected with the outer tab; the aluminum plastic film wraps and seals the pole piece and the inner tab to form an accommodating cavity; the electrolyte is positioned in the accommodating cavity; the first end of the outer tab is inserted into the accommodating cavity and is electrically connected with the inner tab, and the second end of the outer tab is exposed out of the accommodating cavity; wherein the end face of the second end of the inner tab is a plane, the end face of the first end of the outer tab is a plane, and the end face of the second end of the inner tab is connected with the end face of the first end of the outer tab through welding marks. According to the battery, the end face of the inner tab and the end face of the outer tab can be directly contacted and welded, so that the welding volume during welding can be reduced, and the energy density of the battery is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery and an electronic device. Background Art

[0002] Tabs are a component of soft-pack lithium-ion battery products. Batteries have positive and negative electrodes, and tabs are metal conductors welded to the battery cell. These tabs serve as contact points during charging and discharging. In soft-pack lithium-ion batteries, the internal multi-tabs are typically welded to the electrode sheets to connect the positive and negative electrodes in the cell. To ensure a seal, these tabs must be connected to the external tabs via adapter welding. Existing processes use stacked welding, which results in a large weld area and bulk, sacrificing the battery's energy density. Utility Model Content

[0003] The present application provides a battery and an electronic device, which can reduce the welding volume between the inner and outer tabs and achieve an increase in the energy density of the battery.

[0004] In a first aspect, a battery is provided, comprising: an electrode assembly, an inner positive tab, an inner negative tab, an aluminum-plastic film, an outer positive tab, an outer negative tab, and an electrolyte, wherein: the electrode assembly comprises a positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive electrode sheet and the negative electrode sheet; a first end of the inner positive tab is electrically connected to the positive electrode sheet, and a second end of the inner positive tab is electrically connected to the outer positive tab; a first end of the inner negative tab is electrically connected to the negative electrode sheet, and a second end of the inner negative tab is electrically connected to the outer negative tab; the aluminum-plastic film covers and seals the electrode assembly, the inner positive tab, and the inner negative tab to form a receiving cavity; and the electrolyte is located in the receiving cavity; The first end of the external positive tab is inserted into the accommodating cavity and electrically connected to the internal positive tab, and the second end of the external positive tab is exposed outside the accommodating cavity; the first end of the external negative tab is inserted into the accommodating cavity and electrically connected to the internal negative tab, and the second end of the external negative tab is exposed outside the accommodating cavity; wherein, the end surface of the second end of the internal positive tab is a first plane, the end surface of the first end of the external positive tab is a second plane, and the first plane and the second plane are connected by a first weld mark; the end surface of the second end of the internal negative tab is a third plane, the end surface of the first end of the external negative tab is a fourth plane, and the third plane and the fourth plane are connected by a second weld mark.

[0005] In an embodiment of the present application, one end of the inner positive electrode ear can be connected to the positive electrode of the battery, and the other end of the inner positive electrode ear can be connected to the outer positive electrode ear, and the outer positive electrode ear can extend out of the aluminum-plastic film to achieve electrical connection between the positive electrode of the battery and the external device; one end of the inner negative electrode ear can be connected to the negative electrode of the battery, and the other end of the inner negative electrode ear can be connected to the outer negative electrode ear, and the outer negative electrode ear can extend out of the aluminum-plastic film to achieve electrical connection between the negative electrode of the battery and the external device. In addition, the end face of the end of the inner electrode ear away from the electrode assembly can be connected to the end face of the first end of the outer electrode ear, and the two end faces can be welded by splicing welding. Compared with the lap welding method, the welding volume of the inner electrode ear and the outer electrode ear can be reduced. In addition, the end face of the second end of the inner electrode ear and the end face of the first end of the outer electrode ear are both flat. Compared with welding two concave and convex surfaces, the welding volume occupied by the two flat surfaces is reduced. The space occupied by welding is reduced, the space utilization rate inside the battery is improved, and the battery energy density can be improved.

[0006] In one possible implementation, the inner positive electrode tab may be an aluminum tab, the inner negative electrode tab may be a copper tab, the outer positive electrode tab may be an aluminum tab, and the outer negative electrode tab may be a nickel tab or a copper-plated nickel tab.

[0007] In one possible implementation, the battery may include an electrode assembly, an inner tab, an aluminum-plastic film, an outer tab, and an electrolyte, wherein the inner tab includes an inner positive tab and an inner negative tab, and the outer tab includes an outer positive tab and an outer negative tab; the end surface of the second end of the inner positive tab is connected to the end surface of the first end of the outer positive tab, thereby achieving electrical connection between the inner positive tab and the outer positive tab; the end surface of the second end of the outer positive tab is connected to the end surface of the first end of the outer negative tab, thereby achieving electrical connection between the inner negative tab and the outer negative tab.

[0008] In conjunction with the first aspect, in certain implementations of the first aspect, the end surface of the second end of the inner tab and the end surface of the first end of the outer tab are welded using a butt welding method. The end surface of the second end of the inner tab and the end surface of the first end of the outer tab can be directly in contact and welded, and the welding surface is a flat surface.

[0009] In a possible implementation, the end surface of the second end of the inner tab and the end surface of the first end of the outer tab may be welded by pulse laser welding.

[0010] In one possible implementation, the inner tab may include an inner positive tab and an inner negative tab, and the outer tab may include an outer positive tab and an outer negative tab. The end surface of the second end of the inner positive tab and the end surface of the first end of the outer positive tab may be welded using a patch weld method, i.e., the end surface of the second end of the inner positive tab and the end surface of the first end of the outer positive tab may be in direct contact and welded together, with the weld surface being a flat surface. The end surface of the second end of the inner negative tab and the end surface of the first end of the outer negative tab may be welded using a patch weld method, i.e., the end surface of the second end of the inner negative tab and the end surface of the first end of the outer negative tab may be in direct contact and welded together, with the weld surface being a flat surface.

[0011] In an embodiment of the present application, the end face of the second end of the inner pole ear and the end face of the first end of the outer pole ear can be welded by splice welding. Compared with welding methods such as lap welding, the splice welding method can reduce the welding volume of the inner pole ear and the outer pole ear, and the volume occupied by the welding is reduced, so that the battery energy density is improved. For example, the overall battery energy density can be increased by 1% to 1.5% year-on-year.

[0012] In combination with the first aspect, in certain implementations of the first aspect, the first plane and the second plane respectively have a first preset angle with the first direction, and the first direction is the direction in which the inner positive tab is connected to the outer positive tab; the third plane and the fourth plane respectively have a second preset angle with the third direction, and the third direction is the direction in which the inner negative tab is connected to the outer negative tab.

[0013] Exemplarily, the first preset angle and the second preset angle may be between 0 degrees and 90 degrees. For example, the first preset angle and the second preset angle may be 20 degrees, 40 degrees, 60 degrees, 80 degrees, etc.

[0014] In an embodiment of the present application, the contact surface or welding surface of the second end of the inner positive electrode ear and the first end of the outer positive electrode ear can be at a preset angle to the first direction, and the contact surface or welding surface of the second end of the inner negative electrode ear and the first end of the outer negative electrode ear can be at a preset angle to the third direction; that is, the contact surface or welding surface of the inner electrode ear and the outer electrode ear can be arranged not horizontally or vertically, but inclined, which can reduce the volume occupied by the welding to a certain extent, thereby improving the energy density of the battery.

[0015] Exemplarily, the first preset angle may be 90 degrees, and the second preset angle may be 90 degrees.

[0016] In an embodiment of the present application, the contact surface or welding surface between the second end of the inner positive electrode ear and the first end of the outer positive electrode ear can be perpendicular to the first direction, and the contact surface or welding surface between the second end of the inner negative electrode ear and the first end of the outer negative electrode ear can be perpendicular to the third direction, thereby reducing the volume occupied by the welding and improving the energy density of the battery.

[0017] In combination with the first aspect, in certain implementations of the first aspect, the inner positive tab includes a first welding segment, the outer positive tab includes a second welding segment, the first welding segment and the second welding segment are located on both sides of the first weld mark, the end surface of the first welding segment away from the electrode assembly is the first plane, and the end surface of the second welding segment close to the first welding segment is the second plane; the first surface of the first welding segment and the first surface of the second welding segment are located on the same plane, and the second surface of the first welding segment and the second surface of the second welding segment are located on the same plane; the inner negative tab includes a third welding segment, and the outer negative tab includes a fourth welding segment, the third welding segment and the fourth welding segment are located on both sides of the second weld mark, the end surface of the third welding segment away from the electrode assembly is the third plane, and the end surface of the fourth welding segment close to the third welding segment is the fourth plane; the first surface of the third welding segment and the first surface of the fourth welding segment are located on the same plane, and the second surface of the third welding segment and the second surface of the fourth welding segment are located on the same plane.

[0018] In an embodiment of the present application, the thickness of the first welding section of the inner positive electrode ear and the second welding section of the outer positive electrode ear can be the same, and the surface of the first welding section of the inner positive electrode ear and the surface of the second welding section of the outer positive electrode ear can be flush or approximately flush; the thickness of the third welding section of the inner negative electrode ear and the fourth welding section of the outer negative electrode ear can be the same, and the surface of the third welding section of the inner negative electrode ear and the surface of the fourth welding section of the outer negative electrode ear can be flush or approximately flush; thereby reducing the volume occupied by welding and improving the energy density of the battery.

[0019] In one possible implementation, the first welding section of the inner positive electrode ear may be a sheet-like structure, and the first surface of the first welding section may be parallel or approximately parallel to the second surface of the first welding section; the second welding section of the outer positive electrode ear may be a sheet-like structure, and the first surface of the second welding section may be parallel or approximately parallel to the second surface of the second welding section; the third welding section of the inner negative electrode ear may be a sheet-like structure, and the first surface of the third welding section may be parallel or approximately parallel to the second surface of the third welding section; the fourth welding section of the outer negative electrode ear may be a sheet-like structure, and the first surface of the fourth welding section may be parallel or approximately parallel to the second surface of the fourth welding section.

[0020] It should be noted that the first welding segment, the second welding segment, the third welding segment and the fourth welding segment may have certain height fluctuations or thickness changes.

[0021] In combination with the first aspect, in certain implementations of the first aspect, the inner positive electrode tab may include a first welding segment and a first connecting segment, one end of the first connecting segment is connected to the positive electrode sheet, the other end of the first connecting segment is connected to the first welding segment, and the connection direction between the first welding segment and the second welding segment is perpendicular to the fifth direction, and the fifth direction is the thickness direction of the battery; the inner negative electrode tab may include a second connecting segment and a third welding segment, one end of the second connecting segment is connected to the negative electrode sheet, the other end of the second connecting segment is connected to the third welding segment, and the connection direction between the third welding segment and the fourth welding segment is perpendicular to the fifth direction.

[0022] For example, if the battery is a laminated lithium-ion battery, the thickness direction of the battery can be understood as the direction in which the laminates are stacked; if the battery is a wound lithium-ion battery, the thickness direction of the battery can be understood as the radial direction of the wound lithium-ion battery.

[0023] Illustratively, the connection direction between the first welding segment and the second welding segment is perpendicular to the fifth direction, that is, the first welding segment and the second welding segment can be arranged perpendicular to the fifth direction.

[0024] Illustratively, the connection direction between the third welding segment and the fourth welding segment is perpendicular to the fifth direction, that is, the third welding segment and the fourth welding segment can be arranged perpendicular to the fifth direction.

[0025] It should be noted that the first welding segment, the second welding segment, the third welding segment and the fourth welding segment may have certain height fluctuations or thickness changes, but are generally arranged perpendicular to the fifth direction.

[0026] Illustratively, the welding portion of the inner tab and the outer tab can be placed horizontally, straight out, or slightly tilted at a certain angle, that is, the first welding segment of the inner positive tab can be placed horizontally, straight out, or slightly tilted at a certain angle (such as 5 degrees), and the second welding segment of the outer positive tab can be placed horizontally, straight out, or slightly tilted at a certain angle (such as 5 degrees); the third welding segment of the inner negative tab can be placed horizontally, straight out, or slightly tilted at a certain angle (such as 5 degrees), and the fourth welding segment of the outer negative tab can be placed horizontally, straight out, or slightly tilted at a certain angle (such as 5 degrees).

[0027] In the embodiments of the present application, the first welding section of the inner positive tab and the third welding section of the inner negative tab can be arranged perpendicular to the thickness of the battery, thereby simplifying the assembly of the inner and outer tabs. The end faces of the inner and outer tabs can be directly connected, eliminating the need for bending and vertical placement of the welding area, reducing the volume occupied by the welding, and thus achieving an increase in battery energy density.

[0028] In combination with the first aspect, in certain implementations of the first aspect, the inner positive electrode ear may include a first welding section, a first connecting section and a first intermediate section, the first intermediate section is connected between the first connecting section and the first welding section, the first connecting section is used to connect the positive electrode sheet, the first intermediate section is connected to the first welding section at a third preset angle, and the fifth direction is the thickness direction of the battery; the inner negative electrode ear may include a third welding section, a second connecting section and a second intermediate section, the second intermediate section is connected between the second connecting section and the third welding section, the second connecting section is used to connect the negative electrode sheet, and the second intermediate section is connected to the third welding section at a fourth preset angle.

[0029] For example, the third preset angle may be between 0 degrees and 90 degrees (inclusive), and the fourth preset angle may also be between 0 degrees and 90 degrees (inclusive). For example, the third preset angle and the fourth preset angle may be 10 degrees, 20 degrees, 30 degrees, 40 degrees, 50 degrees, 60 degrees, 70 degrees, 80 degrees, 90 degrees, etc.

[0030] Illustratively, the welded portion of the inner electrode tab and the outer electrode tab can be bent vertically, that is, the end of the inner positive electrode tab away from the positive electrode sheet can be bent to form a first welding section, so that the first middle section is connected to the first welding section at a certain angle, and the end of the outer positive electrode tab extending into the accommodating cavity can also be bent to form a second welding section, and the second welding section is welded to the first welding section; the end of the inner negative electrode tab away from the negative electrode sheet can be bent to form a third welding section, so that the second middle section is connected to the third welding section at a certain angle, and the end of the outer negative electrode tab extending into the accommodating cavity can also be bent to form a fourth welding section, and the fourth welding section is welded to the third welding section.

[0031] In the embodiment of the present application, the inner and outer tabs can be bent according to the internal layout of the battery, which can reduce the volume occupied by welding to a certain extent, thereby improving the energy density of the battery. In addition, by bending the parts where the inner and outer tabs are welded, the reliability is higher, making the battery safer.

[0032] That is, in this application, the welding position can be selectively set according to the internal layout of the battery. In some cases, the interface between the inner and outer tabs can be set parallel to the thickness direction of the battery. In some cases, the interface between the inner and outer tabs can also be set at a certain angle to the thickness direction of the battery.

[0033] In conjunction with the first aspect, in certain implementations of the first aspect, the outer surfaces of the first weld mark and the second weld mark are both coated with a tab sealant. The tab sealant may have a thickness of 0.01 mm to 1 mm, and the direction of the thickness may be the direction of the thickness of the outer positive tab or the outer negative tab.

[0034] In a possible implementation, the tab sealant may completely cover the first weld mark and the second weld mark.

[0035] In a possible implementation, the tab sealant may be made of polypropylene glue.

[0036] In an embodiment of the present application, the outer surface of the first weld mark formed by welding the inner positive electrode ear and the outer positive electrode ear and the outer surface of the second weld mark formed by welding the inner negative electrode ear and the outer negative electrode ear can be wrapped with electrode sealant, so that the welding area can be sealed. Since the electrode sealant will not easily bounce off, the protection effect of the first weld mark and the second weld mark can be improved.

[0037] In conjunction with the first aspect, in certain implementations of the first aspect, the size range of the first weld mark along a first direction (i.e., the width range and weld width range of the first weld mark) may be 0.1 mm to 1 mm, and the size range of the first weld mark along a second direction (i.e., the depth range and weld depth range of the first weld mark) may be 0.05 mm to 0.1 mm. The first direction is the direction in which the inner positive electrode tab is connected to the outer positive electrode tab, and the second direction is the thickness direction of the outer positive electrode tab. The size range of the second weld mark along a third direction (i.e., the width range and weld width range of the second weld mark) may be 0.1 mm to 1 mm, and the size range of the second weld mark along a fourth direction (i.e., the depth range and weld depth range of the second weld mark) may be 0.05 mm to 0.1 mm. The third direction is the direction in which the inner negative electrode tab is connected to the outer negative electrode tab, and the fourth direction is the thickness direction of the outer negative electrode tab.

[0038] Illustratively, the width ranges of the first weld mark / the second weld mark or the weld width of the weld surface formed by welding may be: 0.1 mm-0.2 mm, 0.2 mm-0.3 mm, 0.3 mm-0.4 mm, 0.4 mm-0.5 mm, 0.5 mm-0.6 mm, 0.7 mm-0.8 mm, 0.8 mm-1 mm, 0.1 mm-0.5 mm, 0.5 mm-1 mm. For example, the widths of the first weld mark / the second weld mark or the weld width of the weld surface formed by welding may be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm.

[0039] For example, the depth ranges of the first weld mark / the second weld mark or the penetration depth of the weld surface formed by welding may be: 0.05mm-0.06mm, 0.06mm-0.07mm, 0.07mm-0.08mm, 0.08mm-0.09mm, or 0.09mm-0.1mm. For example, the depths of the first weld mark / the second weld mark or the penetration depth of the weld surface formed by welding may be 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, or 0.1mm.

[0040] In the embodiment of the present application, by limiting the width and depth of the first weld mark and the second weld mark, it is ensured that neither weld leakage nor cold weld will occur. While ensuring the welding effect, the space occupied by the weld can be reduced, thereby improving the battery energy density.

[0041] In combination with the first aspect, in certain implementations of the first aspect, the electrode assembly is formed by alternately stacking the positive electrode sheet, the separator, and the negative electrode sheet; or, the electrode assembly is formed by alternately stacking and winding the positive electrode sheet, the separator, and the negative electrode sheet.

[0042] In an embodiment of the present application, the electrode assembly can be formed by alternatingly stacking positive electrode sheets, separators and negative electrode sheets to form a laminated battery; the electrode assembly can also be formed by alternatingly stacking and winding positive electrode sheets, separators and negative electrode sheets to form a wound battery.

[0043] In combination with the first aspect, in certain implementations of the first aspect, the battery further includes an insulating coating, which is coated on a side of the positive electrode sheet close to the inner positive electrode tab or the inner negative electrode tab.

[0044] In an embodiment of the present application, the battery may further include an insulating coating, which may be provided on one side of the positive electrode sheet close to the inner positive electrode tab or the inner negative electrode tab to prevent the positive and negative electrode sheets from directly contacting each other and causing a short circuit.

[0045] In combination with the first aspect, in certain implementations of the first aspect, the battery further includes a cover adhesive, the cover adhesive being disposed in the cavity formed by the aluminum-plastic film, and the cover adhesive covering the inner positive electrode tab and the inner negative electrode tab.

[0046] In an embodiment of the present application, the battery may further include a cover glue, which may be used to cover the inner pole ears (including the inner positive pole ear and the inner negative pole ear), thereby preventing the burrs on the edges of the inner pole ears (including the inner positive pole ear and the inner negative pole ear) from causing short circuits, corrosion and other problems.

[0047] In a second aspect, an electronic device is provided. The electronic device may include the battery as described in the first aspect or any implementation of the first aspect.

[0048] Exemplarily, the electronic device may be a terminal consumer product or a 3C electronic product (i.e., computer, communication, and consumer electronic products), such as a mobile phone, a mobile power bank, a portable computer, a tablet computer, an e-reader, a laptop computer, a digital camera, a wearable device, a vehicle-mounted terminal, a headset, or other devices, or it may also be a vehicle, an electric skateboard, an electric bicycle, or other devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a structural diagram of an electronic device provided in an embodiment of the present application.

[0050] Figure 2 This is a schematic diagram of the working principle of a battery provided in an embodiment of the present application.

[0051] Figure 3 It is a structural schematic diagram of a battery provided in an embodiment of the present application.

[0052] Figure 4 It is a schematic structural diagram of another battery provided in an embodiment of the present application.

[0053] Figure 5A This is a schematic diagram of a three-dimensional structure of welding an inner positive electrode tab and an outer positive electrode tab provided in an embodiment of the present application.

[0054] Figure 5B This is a schematic diagram of a three-dimensional structure of welding an inner negative electrode ear and an outer negative electrode ear provided in an embodiment of the present application.

[0055] Figure 6 It is a schematic structural diagram of another battery provided in an embodiment of the present application.

[0056] Figure 7 It is a schematic structural diagram of another battery provided in an embodiment of the present application.

[0057] Figure 8A This is another schematic diagram of the three-dimensional structure of the inner positive electrode tab and the outer positive electrode tab welded together according to an embodiment of the present application.

[0058] Figure 8B This is a schematic diagram of another three-dimensional structure of welding an inner negative electrode ear and an outer negative electrode ear provided in an embodiment of the present application.

[0059] 9A to 9D It is a schematic diagram of a preparation process of a battery provided in an embodiment of the present application. DETAILED DESCRIPTION

[0060] The technical solution in this application will be described below with reference to the accompanying drawings.

[0061] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first" and "second" can sensibly or implicitly include one or more features. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two, and "at least one" and "one or more" mean one, two or more. The singular expressions "one", "a", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless the context clearly indicates otherwise. The size of the sequence numbers of the processes below does not mean the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. For example, in the embodiments of the present application, words such as "110", "120", and "130" are merely identifiers made for the convenience of description and do not limit the order of execution of the steps.

[0062] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in yet other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0063] In the description of the embodiments of the present application, the terms "upper", "lower", "inside", "outside", "vertical", "horizontal", etc. indicate orientations or positional relationships that are defined relative to the orientations or positions of the components schematically placed in the accompanying drawings. It should be understood that these directional terms are relative concepts. They are used for description and clarification relative to the actual orientation, rather than indicating or implying that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. They may change accordingly according to changes in the orientation of the components placed in the accompanying drawings, and therefore cannot be understood as limitations on the present application. In addition, the "vertical" involved in this application is not vertical in the strict sense, but is within the allowable error range. "Parallel" is not parallel in the strict sense, but is within the allowable error range.

[0064] Tabs are a component of soft-pack lithium-ion battery products. Batteries are divided into positive and negative electrodes. Tabs are metal conductors welded to the battery cell. The tabs on the positive and negative poles of the battery are the contact points during charging and discharging. The positive electrode of the battery is made of aluminum, and the negative electrode is made of nickel or copper-plated nickel material. Both are composed of a composite of two parts: film and metal strip. In soft-pack lithium-ion batteries, the built-in multi-tabs are usually welded to the electrode to lead out the positive and negative electrodes in the battery cell. To ensure the sealing effect, the built-in multi-tabs need to be connected to the external tabs through transfer welding. The existing process uses a stacking welding method, which has a large weld area and bulk, sacrificing the battery's energy density.

[0065] Therefore, the present application provides a battery and an electronic device that can reduce the welding volume between the inner tab and the outer tab, thereby improving the energy density of the battery.

[0066] The solutions provided in the embodiments of the present application can be applied to electronic devices. For example, the electronic devices can be terminal consumer products or 3C electronic products (computer, communication, and consumer electronic products), such as mobile phones, power banks, portable computers, tablet computers, e-readers, notebook computers, digital cameras, wearable devices, vehicle-mounted terminals, headphones, and other devices; or they can also be vehicles, electric skateboards, electric bicycles, and other devices.

[0067] Figure 1 1 is a schematic structural diagram of an electronic device 100 provided in an embodiment of the present application. Figure 1 The illustrated embodiment is described by taking the electronic device 100 as a mobile phone as an example.

[0068] The electronic device 100 includes a housing 10, a display screen 20, and a circuit board assembly 30. Specifically, the housing 10 includes a frame and a back cover. The frame surrounds the outer periphery of the display screen 20 and the outer periphery of the back cover. The cavity formed between the display screen 20, the frame, and the back cover can be used to place the circuit board assembly 30. In one example, the display screen 20 and the circuit board assembly 30 can both be set on the housing 10. The electronic device 100 may also include a battery 40 for powering the circuit board assembly 30. The battery 40 may be, for example, a lithium secondary battery, a sodium ion secondary battery, a potassium ion secondary battery, a magnesium ion secondary battery, a zinc ion secondary battery, an aluminum ion secondary battery, etc.

[0069] Figure 2 This is a working principle diagram of a battery 40. The core components of the battery 40 may include a positive electrode 110, a negative electrode 120, an electrolyte 130, and a separator 140 (corresponding connecting accessories and circuits are not shown). The positive electrode 110 and the negative electrode 120 can intercalate and deintercalate lithium ions to achieve energy storage and release. Figure 2As shown, the movement of Li+ to the left (positive electrode) is an energy release process, and the movement of Li+ to the right (negative electrode) is an energy storage process. The electrolyte 130 can be a transmission carrier of lithium ions between the positive electrode sheet 110 and the negative electrode sheet 120. The positive electrode sheet 110 and the negative electrode sheet 120 are the main energy storage parts of the battery 40, which can reflect the energy density, cycle performance and safety performance of the battery cell. The diaphragm 140 is permeable to lithium ions, but the diaphragm 140 itself is not conductive, so that the diaphragm 140 can separate the positive electrode sheet 110 and the negative electrode sheet 120 to prevent a short circuit between the positive electrode sheet 110 and the negative electrode sheet 120. The basic characteristics of the diaphragm 140 are porosity (which can provide a channel for ion transmission) and insulation (to prevent leakage).

[0070] Figures 3 to 8B The specific structure of the battery 40 provided in the embodiment of the present application is introduced.

[0071] Combine Figure 3 、 Figure 4 、 Figure 6 and Figure 7 As can be seen, the battery 40 may include an electrode assembly 41, an inner tab, an aluminum-plastic film 42 that wraps and seals the electrode assembly 41 and the inner tab, an outer tab, and an electrolyte 130. The inner tabs include an inner positive tab 150 and an inner negative tab 160, and the outer tabs include an outer positive tab 210 and an outer negative tab 220. One end of the inner positive tab 150 can be connected to the positive electrode sheet 110, and the other end of the inner positive tab 150 can be connected to the outer positive tab 210. The outer positive tab 210 can extend outside the aluminum-plastic film 42 to achieve electrical connection between the battery 40 and the positive electrode of an external device. One end of the inner negative tab 160 can be connected to the negative electrode sheet 120, and the other end of the inner negative tab 160 can be connected to the outer negative tab 220. The outer negative tab 220 can extend outside the aluminum-plastic film 42 to achieve electrical connection between the battery 40 and the negative electrode of an external device. In this way, a current path of positive electrode sheet 110 - inner positive electrode tab 150 - outer positive electrode tab 210 - external device can be formed, and a current path of negative electrode sheet 120 - inner negative electrode tab 160 - outer negative electrode tab 220 - external device can be formed, thereby realizing power supply of the battery 40 to the external device.

[0072] It should be understood that the aluminum-plastic film 42 can cover and seal the electrode assembly 41, the inner positive electrode tab 150 and the inner negative electrode tab 160 to form a accommodating cavity; the electrolyte 130 is located in the accommodating cavity; the first end of the outer positive electrode tab 210 can be inserted into the accommodating cavity and electrically connected to the inner positive electrode tab 150, and the second end of the outer positive electrode tab 210 can be exposed outside the accommodating cavity; the first end of the outer negative electrode tab 220 can be inserted into the accommodating cavity and electrically connected to the inner negative electrode tab 160, and the second end of the outer negative electrode tab 220 can be exposed outside the accommodating cavity.

[0073] It should be understood that the electrode assembly 41 can be a wound electrode assembly or a laminated electrode assembly; the battery 40 can be a wound battery or a laminated battery, without limitation.

[0074] In some examples, the electrode assembly 41 may be a wound electrode assembly, and the electrode assembly 41 may be formed by stacking the positive electrode sheet 110, the separator 140, and the negative electrode sheet 120 together and then winding them. For example, the stacked positive electrode sheet 110, the separator 140, and the negative electrode sheet 120 may be wound in any suitable winding manner such as a Z-shape, an S-shape, or a U-shape. Exemplarily, the electrode assembly 41 includes a plurality of positive electrode sheets 110 and a plurality of negative electrode sheets 120, so that when manufacturing the electrode assembly 41, the positive electrode sheets 110, the separator 140, and the negative electrode sheets 120 may be alternately stacked and wound.

[0075] In other examples, the electrode assembly 41 may be a laminated electrode assembly, and the electrode assembly 41 may be formed by alternately stacking the positive electrode sheets 110, the separators 140, and the negative electrode sheets 120. For example, the electrode assembly 41 includes a plurality of positive electrode sheets 110 and a plurality of negative electrode sheets 120. When manufacturing the electrode assembly 41, the positive electrode sheets 110, the separators 140, and the negative electrode sheets 120 may be alternately stacked.

[0076] It should be understood that the positive electrode sheet 110 and the negative electrode sheet 120 can be prepared using any process known in the art. For example, in some examples, the positive electrode sheet 110 can be formed by evenly coating a positive electrode slurry on an aluminum foil serving as a positive electrode current collector, followed by drying and rolling. Similarly, the negative electrode sheet 120 can be formed by evenly coating a negative electrode slurry on a copper foil serving as a negative electrode current collector, followed by drying and rolling. The positive electrode slurry can include, for example, polyvinylidene fluoride, a nanocomposite conductive agent, lithium iron phosphate, etc.; the negative electrode slurry can include, for example, styrene-butadiene rubber, a nanocomposite conductive agent, artificial graphite, etc.

[0077] The separator 140 used to separate the positive electrode sheet 110 and the negative electrode sheet 120 can be made of polypropylene (PP), polyethylene, or other suitable materials. In some examples, a three-layer structure of polypropylene / polyethylene / polypropylene with a thickness of 20 μm-40 μm can be used as the separator 140, and the porosity can be between 45% and 60%.

[0078] In some examples, such as Figure 3 、 Figure 4 、 Figure 6 and Figure 7 As shown, one end of the positive electrode sheet 110 can be coated with an insulating coating 170. The insulating coating 170 can be coated on one side of the positive electrode sheet 110 close to the inner positive electrode ear 150 or the inner negative electrode ear 160. The insulating coating 170 is used to prevent the positive and negative electrodes at the edge of the electrode sheet from short-circuiting.

[0079] It should be understood that in the wound or stacked structure of the battery, the positive electrode sheets 110 and the negative electrode sheets 120 are arranged alternately with a separator 140 in between. Due to errors or physical stress in the manufacturing process, the edges of the positive electrode sheets 110 or the negative electrode sheets 120 may protrude, causing the positive electrode sheets 110 and the negative electrode sheets 120 to directly contact each other, causing a short circuit. Therefore, in the present application, an insulating coating 170 can be applied to the edges of the positive electrode sheets 110 or the negative electrode sheets 120 to form a physical barrier to prevent the positive electrode sheets 110 and the negative electrode sheets 120 from directly contacting each other and causing a short circuit. In addition, the insulating coating 170 can also help fix the edges of the electrode sheets so that they remain stable during the battery charge and discharge cycle, avoiding edge displacement caused by expansion or contraction, and thus preventing short circuits.

[0080] It should be understood that the aluminum-plastic film 42 can cover and seal the inner pole ear by hiding the inner pole ear in the cavity formed by the aluminum-plastic film 42 to protect the inner pole ear and prevent subsequent operations from affecting the connection between the inner pole ear and the electrode sheet. In particular, when multiple positive electrode sheets 110 and multiple negative electrode sheets 120 are alternately stacked together, the inner pole ear is set in the cavity of the aluminum-plastic film 42 to avoid shaking of the inner pole ear.

[0081] It should be understood that the inner positive electrode tab 150 welded on the positive electrode sheet 110 and the inner negative electrode tab 160 welded on the negative electrode sheet 120 need to be spaced apart to avoid a short circuit between the two.

[0082] The inner positive tab 150 and the inner negative tab 160 may be disposed at one end of the electrode assembly 41 , wherein the inner positive tab 150 is electrically connected to the positive electrode sheet 110 , and the inner negative tab 160 is electrically connected to the negative electrode sheet 120 .

[0083] For example, the inner positive electrode tab 150 welded to the positive electrode sheet 110 can be made of the same material as the positive electrode sheet 110. For example, the inner positive electrode tab 150 welded to the positive electrode sheet 110 can be an aluminum tab. Similarly, the inner negative electrode tab 160 welded to the negative electrode sheet 120 can be made of the same material as the negative electrode sheet 120. For example, the inner negative electrode tab 160 welded to the negative electrode sheet 120 can be a copper tab. By using the same material as the positive electrode sheet 110 and the negative electrode sheet 120 for the inner tabs welded to the positive electrode sheet 110 and the negative electrode sheet 120, respectively, they can have the same physical and chemical properties, such as resistivity and thermal expansion coefficient, and can also reduce the difficulty of welding the inner tab to the electrode sheet. Of course, in other examples, any suitable material can be used to make the inner positive electrode tab 150 and the inner negative electrode tab 160, and the embodiments of the present application are not specifically limited.

[0084] In the embodiments of this application, Figure 3 、 Figure 4 、 Figure 6 and Figure 7 As shown, the end surface of the second end of the inner positive tab 150 (the end away from the positive electrode sheet 110) can be a first plane, the end surface of the first end of the outer positive tab 210 (the end extending into the aluminum-plastic film 42) can be a second plane, and the first plane and the second plane can be connected by a first weld mark 12; the end surface of the second end of the inner negative tab 160 (the end away from the negative electrode sheet 120) can be a third plane, and the end surface of the first end of the outer negative tab 220 (the end extending into the aluminum-plastic film 42) can be a fourth plane, and the third plane and the fourth plane can be connected by a second weld mark 22.

[0085] It should be understood that the inner positive tab 150 and the outer positive tab 210, as well as the inner negative tab 160 and the outer negative tab 220, can be welded together using a splice welding method, such as pulsed laser welding. That is, the second end surface of the inner positive tab 150 is in contact with the first end surface of the outer positive tab 210, and the second end surface of the inner negative tab 160 is in contact with the first end surface of the outer negative tab 220.

[0086] It should also be understood that the present application utilizes a splice welding method, which, compared to other welding methods such as tack welding, can reduce the welding volume between the inner and outer tabs and simplify the assembly of the inner and outer tabs. The reduced welding volume improves the internal battery space utilization, resulting in a higher battery energy density, which can achieve an overall year-on-year increase in battery energy density of 1% to 1.5%.

[0087] In some examples, such as Figure 3 and Figure 6 As shown, the inner positive tab 150 includes a first welding section 151, and the outer positive tab 210 includes a second welding section 211. The first welding section 151 and the second welding section 211 are located on either side of the first weld mark 12. The end surface 1511 of the first welding section 151 away from the electrode assembly 41 is a first plane, and the end surface 2111 of the second welding section 211 closer to the first welding section 151 (or the end surface of the outer positive tab 210 extending into the aluminum-plastic film 42) is a second plane. The first surface 1512 of the first welding section 151 and the first surface 2112 of the second welding section 211 are located on the same plane, and the second surface 1513 of the first welding section 151 and the second surface 2113 of the second welding section 211 are located on the same plane.

[0088] It should be understood that the thickness of the first welding section 151 of the inner positive tab 150 and the second welding section 211 of the outer positive tab 210 can be the same, and the surface of the first welding section 151 of the inner positive tab 150 and the surface of the second welding section 211 of the outer positive tab 210 can be flush or approximately flush, so that the two end faces are aligned without misalignment during welding, thereby reducing the volume occupied by welding and improving the battery energy density.

[0089] The first welding section 151 of the inner positive tab 150 can be a sheet-like structure, with the first surface 1512 of the first welding section 151 being parallel or approximately parallel to the second surface 1513 of the first welding section 151. The second welding section 211 of the outer positive tab 210 can be a sheet-like structure, with the first surface 2112 of the second welding section 211 being parallel or approximately parallel to the second surface 2113 of the second welding section 211. It should be understood that the first welding section 151 and the second welding section 211 can have certain height variations or thickness variations.

[0090] For example, the schematic diagram of the three-dimensional structure of the inner positive electrode tab 150 and the outer positive electrode tab 210 being welded can be referred to Figure 5A and Figure 8A .like Figure 5A 、 Figure 8A As shown, the second weld segment 211 of the outer positive tab 210 can be welded to the first weld segment 151 of the inner positive tab 150 to form a first weld mark 12. The dimensions of the first weld mark 12 along a first direction (i.e., the width W1 of the first weld mark 12 and the weld width) can range from 0.1 mm to 1 mm, and the dimensions of the first weld mark 12 along a second direction (i.e., the depth H1 of the first weld mark 12 and the weld depth) can range from 0.05 mm to 0.1 mm. The first direction is the direction of connection between the inner positive tab 150 and the outer positive tab 210, and the second direction is the thickness direction of the outer positive tab 210 (the second weld segment 211 of the outer positive tab 210). It should be understood that the present application does not limit the range of the length L1 of the first weld mark 12 and can be adjusted according to actual conditions.

[0091] For example, the width W1 of the first weld mark 12 may range from 0.1 mm to 0.2 mm, 0.2 mm to 0.3 mm, 0.3 mm to 0.4 mm, 0.4 mm to 0.5 mm, 0.5 mm to 0.6 mm, 0.7 mm to 0.8 mm, 0.8 mm to 1 mm, 0.1 mm to 0.5 mm, or 0.5 mm to 1 mm. For example, the width W1 of the first weld mark 12 may range from 0.1 mm to 0.2 mm, 0.3 mm to 0.4 mm, 0.5 mm to 0.6 mm, 0.7 mm to 0.8 mm, 0.9 mm, or 1 mm.

[0092] For example, the depth H1 of the first weld mark 12 may range from 0.05 mm to 0.06 mm, 0.06 mm to 0.07 mm, 0.07 mm to 0.08 mm, 0.08 mm to 0.09 mm, or 0.09 mm to 0.1 mm. For example, the depth H1 of the first weld mark 12 may range from 0.05 mm to 0.06 mm, 0.07 mm to 0.08 mm, 0.09 mm, or 0.1 mm.

[0093] In the embodiment of the present application, by limiting the width W1 and depth H1 of the first weld mark 12, it can be ensured that there will be neither missing welds nor cold welds. While ensuring the welding effect, the space occupied by the weld can be reduced, thereby improving the battery energy density.

[0094] In some examples, such as Figure 4 and Figure 7 As shown, the inner negative electrode tab 160 includes a third welding segment 161, and the outer negative electrode tab 220 includes a fourth welding segment 221. The third welding segment 161 and the fourth welding segment 221 are located on either side of the second weld mark 22. The end surface 1611 of the third welding segment 161 away from the electrode assembly 41 is a third plane, and the end surface 2211 of the fourth welding segment 221 close to the third welding segment 161 (or the end surface of the end of the outer negative electrode tab 220 extending into the aluminum-plastic film 42) is a fourth plane. The first surface 1612 of the third welding segment 161 and the first surface 2212 of the fourth welding segment 221 are located on the same plane. The second surface 1613 of the third welding segment 161 and the second surface 2213 of the fourth welding segment 221 are located on the same plane. The first surface 1612 of the third welding segment 161 and the second surface 1613 of the third welding segment 161 are parallel to each other.

[0095] It should be understood that the thickness of the third welding section 161 of the inner negative electrode ear 160 and the fourth welding section 221 of the outer negative electrode ear 220 can be the same, and the surface of the third welding section 161 of the inner negative electrode ear 160 and the surface of the fourth welding section 221 of the outer negative electrode ear 220 can be flush or approximately flush, so that the two end faces are aligned without misalignment during welding, thereby reducing the volume occupied by welding and improving the battery energy density.

[0096] The third welding segment 161 of the inner negative electrode tab 160 can be a sheet-like structure, with the first surface 1612 of the third welding segment 161 being parallel or approximately parallel to the second surface 1613 of the third welding segment 161. The fourth welding segment 221 of the outer negative electrode tab 220 can be a sheet-like structure, with the first surface 2212 of the fourth welding segment 221 being parallel or approximately parallel to the second surface 2213 of the fourth welding segment 221. It should be understood that the third welding segment 161 and the second welding segment 211 can have certain height variations or thickness variations.

[0097] For example, the schematic diagram of the three-dimensional structure of the inner negative electrode ear 160 and the outer negative electrode ear 220 being welded can be referred to Figure 5B and Figure 8B ,like Figure 5B 、 Figure 8BAs shown, the fourth weld segment 221 of the outer negative electrode tab 220 can be welded to the third weld segment 161 of the inner negative electrode tab 160 to form a second weld mark 22. The dimensions of the second weld mark 22 along the third direction (i.e., the width W2 of the second weld mark 22 and the weld width) can range from 0.1 mm to 1 mm, and the dimensions of the second weld mark 22 along the fourth direction (i.e., the depth H2 of the second weld mark 22 and the weld depth) can range from 0.05 mm to 0.1 mm. The first direction is the direction of connection between the inner negative electrode tab 160 and the outer negative electrode tab 220, and the fourth direction is the thickness direction of the outer negative electrode tab 220 (the fourth weld segment 221 of the outer negative electrode tab 220). It should be understood that the present application does not limit the range of the length L2 of the second weld mark 22 and can be adjusted according to actual conditions.

[0098] For example, the width W2 of the second weld mark 22 may range from 0.1 mm to 0.2 mm, 0.2 mm to 0.3 mm, 0.3 mm to 0.4 mm, 0.4 mm to 0.5 mm, 0.5 mm to 0.6 mm, 0.7 mm to 0.8 mm, 0.8 mm to 1 mm, 0.1 mm to 0.5 mm, or 0.5 mm to 1 mm. For example, the width W1 of the second weld mark 22 may range from 0.1 mm to 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm.

[0099] For example, the depth H2 of the second weld mark 22 may range from 0.05 mm to 0.06 mm, 0.06 mm to 0.07 mm, 0.07 mm to 0.08 mm, 0.08 mm to 0.09 mm, or 0.09 mm to 0.1 mm. For example, the depth H2 of the second weld mark 22 may range from 0.05 mm to 0.06 mm, 0.07 mm to 0.08 mm, 0.09 mm, or 0.1 mm.

[0100] In the embodiment of the present application, by limiting the width W2 and depth H2 of the second weld mark 22, it can be ensured that neither weld leaks nor cold welds occur. While ensuring the welding effect, the space occupied by the weld can be reduced, thereby improving the battery energy density.

[0101] In some examples, such as Figure 3 As shown, the inner positive electrode tab 150 may include a first connecting segment 152 and a first welding segment 151 . One end of the first connecting segment 152 is connected to the positive electrode sheet 110 , and the other end of the first connecting segment 152 is connected to the first welding segment 151 .

[0102] Illustratively, the first connecting segment 152 may include multiple first connecting segments 152, each of which is connected to a positive electrode sheet 110. The ends of the multiple first connecting segments 152, distal from the positive electrode sheet 110, may be combined to form a first welding segment 151, which is used to weld to the external positive tab 210. One end of the external positive tab 210 extends into the accommodating cavity formed by the aluminum-plastic film 42, while the other end of the external positive tab 210 extends outside the aluminum-plastic film 42 to serve as an electrical connection point for the external positive electrode of the battery 40. The end of the external positive tab 210 extending into the aluminum-plastic film 42 can be welded to the first welding segment 151 of the internal positive tab 150, forming a first weld mark 12. Specifically, the second welding segment 211 of the external positive tab 210 can be welded to the first welding segment 151 of the internal positive tab 150, forming the first weld mark 12.

[0103] For example, Figure 3 As shown, the end surface 1511 of the first welding segment 151 can be a first plane, and the end surface 2111 of the second welding segment 211 can be a second plane. The end surface 1511 of the first welding segment 151 can be welded to the second plane via the first weld mark 12 as the first plane. Similarly, the end surface 2111 of the second welding segment 211 can be welded to the first plane via the first weld mark 12 as the second plane. The connection direction between the first welding segment 151 and the second welding segment 211 is perpendicular to the fifth direction, which is the thickness direction of the battery. That is, the first welding segment 151 of the inner positive tab 150 and the second welding segment 211 of the outer positive tab 210 can be arranged perpendicular to the fifth direction.

[0104] For example, if the battery is a laminated lithium-ion battery, the fifth direction can be understood as the direction in which the laminates are stacked; if the battery is a wound lithium-ion battery, the fifth direction can be understood as the radial direction of the wound lithium-ion battery.

[0105] It should be understood that the first welding section 151 of the inner positive tab 150 and the second welding section 211 of the outer positive tab 210 can be arranged perpendicular to the thickness of the battery, thereby simplifying the assembly of the inner and outer tabs. The end faces of the inner and outer tabs can be directly connected, eliminating the need for bending and vertical placement of the welding area, reducing the volume occupied by the welding, and thus achieving an increase in battery energy density.

[0106] In some examples, such as Figure 4 As shown, the inner negative electrode tab 160 may include a second connecting segment 162 and a third welding segment 161 . One end of the second connecting segment 162 is connected to the negative electrode sheet 120 , and the other end of the second connecting segment 162 is connected to the third welding segment 161 .

[0107] Illustratively, the second connecting segment 162 may include multiple segments, each connected to a plurality of negative electrode sheets 120. Each second connecting segment 162 is connected to a negative electrode sheet 120. The ends of the multiple second connecting segments 162 distal from the negative electrode sheets 120 may be combined and gathered to form a third welding segment 161, which is used to weld to the outer negative electrode tab 220. One end of the outer negative electrode tab 220 extends into the accommodating cavity formed by the aluminum-plastic film 42, while the other end of the outer negative electrode tab 220 extends outside the aluminum-plastic film 42 to serve as an electrical connection point for the external negative electrode of the battery 40. The end of the outer negative electrode tab 220 extending into the aluminum-plastic film 42 may be welded to the third welding segment 161 of the inner negative electrode tab 160, thereby forming a second weld mark 22. Specifically, the fourth welding segment 221 of the outer negative electrode tab 220 may be welded to the third welding segment 161 of the inner negative electrode tab 160, thereby forming a second weld mark 22.

[0108] For example, Figure 4 As shown, the end surface 1611 of the third welding segment 161 can be a third plane, and the end surface 2211 of the fourth welding segment 221 can be a fourth plane. That is, the end surface 1611 of the third welding segment 161 can be welded to the fourth plane via the second weld mark 22, and the end surface 2211 of the fourth welding segment 221 can be welded to the third plane via the second weld mark 22. The connection direction between the third welding segment 161 and the fourth welding segment 221 is perpendicular to the fifth direction, which is the thickness direction of the battery. In other words, the third welding segment 161 of the inner negative tab 160 and the fourth welding segment 221 of the outer negative tab 220 can be arranged perpendicular to the fifth direction.

[0109] It should be understood that the third welding section 161 of the inner negative tab 160 and the fourth welding section 221 of the outer negative tab 220 can be arranged perpendicular to the thickness direction of the battery 40, thereby simplifying the assembly of the inner negative tab 160 and the outer negative tab 220. The end surface of the third welding section 161 of the inner negative tab 160 and the end surface of the fourth welding section 221 of the outer negative tab 220 can directly connect, eliminating the need for bending or vertical positioning of the weld area, reducing the volume occupied by the weld, and thus improving the battery energy density.

[0110] Combine Figure 3 and Figure 4 As can be seen, within the battery, the end of the inner tab away from the electrode assembly 41 can be arranged without bending, and the end of the outer tab extending into the aluminum-plastic film 42 can also be arranged without bending, that is, the bending and vertical arrangement of the welding point area is eliminated. However, it should be noted that the first welding segment 151, the second welding segment 211, the third welding segment 161, and the fourth welding segment 221 themselves can have certain height fluctuations or thickness variations, but are generally arranged perpendicular to the fifth direction.

[0111] Illustratively, the welding portions of the inner and outer tabs can be placed horizontally, straight out, or tilted at a certain angle, that is, the first welding segment 151 of the inner positive tab 150 can be placed horizontally, straight out, or slightly tilted at a certain angle (e.g., 5 degrees), and the second welding segment 211 of the outer positive tab 210 can be placed horizontally, straight out, or slightly tilted at a certain angle (e.g., 5 degrees); the third welding segment 161 of the inner negative tab 160 can be placed horizontally, straight out, or slightly tilted at a certain angle (e.g., 5 degrees), and the fourth welding segment 221 of the outer negative tab 220 can be placed horizontally, straight out, or slightly tilted at a certain angle (e.g., 5 degrees).

[0112] In some examples, such as Figure 6 As shown, the inner positive tab 150 includes a first connecting segment 152 , a first middle segment 153 and a first welding segment 151 . The first middle segment 153 is connected between the first connecting segment 152 and the first welding segment 151 . The first connecting segment 152 is used to connect to the positive electrode sheet 110 .

[0113] Illustratively, the first connecting segment 152 may include multiple first connecting segments 152, each of which is connected to a plurality of positive electrode sheets 110. Each first connecting segment 152 is connected to a positive electrode sheet 110. The ends of the multiple first connecting segments 152 away from the positive electrode sheet 110 may be combined and gathered to form a transition portion. The transition portion may include a first intermediate segment 153 and a first welding segment 151. The end of the transition portion away from the first connecting segment 152 may be bent to form the first welding segment 151. The first welding segment 151 is connected to the first intermediate segment 153 at a certain angle (e.g., 90 degrees). The first welding segment 151 is used to weld to the outer positive electrode tab 210. One end of the external positive tab 210 extending into the accommodating cavity can be bent to form a second welding section 211. For example, the external positive tab 210 can be bent to form an "L"-like shape, and the second welding section 211 can extend along the fifth direction; the other end of the external positive tab 210 can serve as an electrical connection point for the external positive electrode of the battery 40; the second welding section 211 can be welded to the first welding section 151 of the internal positive tab 150 and can form a first weld mark 12.

[0114] For example, Figure 6 As shown, the end surface 1511 of the first welding segment 151 of the inner positive tab 150 can be a first plane, and the end surface 2111 of the second welding segment 211 of the outer positive tab 210 can be a second plane. The end surface 1511 of the first welding segment 151 can be welded to the second plane via the first weld mark 12, and the end surface 2111 of the second welding segment 211 can be welded to the first plane via the first weld mark 12.

[0115] The first middle section 153 is connected to the first welding section 151 at a third preset angle, or the first middle section 153 and the first welding section 151 have a third preset angle, which can be between 0 degrees and 90 degrees (including 90 degrees). For example, the third preset angle can be 10 degrees, 20 degrees, 30 degrees, 40 degrees, 50 degrees, 60 degrees, 70 degrees, 80 degrees, 90 degrees, etc.

[0116] In some examples, the first middle section 153 may be perpendicular to the fifth direction, and the first welding section 151 and the second welding section 211 may be parallel to the fifth direction, where the fifth direction is the thickness direction of the battery. In other words, the first middle section 153 may be arranged perpendicular to the fifth direction, and the first welding section 151 and the second welding section 211 may be arranged parallel to the fifth direction.

[0117] It should be noted that Figure 3 The structure shown is different in that Figure 6 The welded portion between the inner positive tab 150 and the outer positive tab 210 can be bent, which has high reliability and makes the battery 40 safer.

[0118] In some examples, such as Figure 7 As shown, the inner negative electrode tab 160 includes a second connecting segment 162 , a second middle segment 163 and a third welding segment 161 . The second middle segment 163 is connected between the second connecting segment 162 and the third welding segment 161 . The second connecting segment 162 is used to connect to the negative electrode sheet 120 .

[0119] Illustratively, the second connecting segment 162 may include multiple segments, each of which is connected to a plurality of negative electrode sheets 120. Each second connecting segment 162 is connected to a negative electrode sheet 120. The ends of the multiple second connecting segments 162 away from the negative electrode sheet 120 may be combined and gathered to form a transition portion. The transition portion may include a second intermediate segment 163 and a third welding segment 161. The end of the transition portion away from the second connecting segment 162 may be bent to form the third welding segment 161. The third welding segment 161 is connected to the second intermediate segment 163 at a certain angle (e.g., 90 degrees). The third welding segment 161 is used to weld to the external negative electrode tab 220. One end of the outer negative electrode ear 220 extending into the accommodating cavity can be bent to form a fourth welding segment 221. For example, the outer negative electrode ear 220 can be bent to form an "L" shape, and the fourth welding segment 221 can extend along the fifth direction; the other end of the outer negative electrode ear 220 can serve as an electrical connection point for the external negative electrode of the battery 40; the fourth welding segment 221 can be welded to the third welding segment 161 of the inner negative electrode ear 160 and can form a second weld mark 22.

[0120] For example, Figure 7As shown, the end surface 1611 of the third welding segment 161 of the inner negative electrode tab 160 can be a third plane, and the end surface 2211 of the fourth welding segment 221 of the outer negative electrode tab 220 can be a fourth plane. The end surface 1611 of the third welding segment 161 can be welded to the fourth plane via the second weld mark 22 as the third plane, and the end surface 2211 of the fourth welding segment 221 can be welded to the third plane via the second weld mark 22 as the fourth plane.

[0121] The second middle section 163 is connected to the third welding section 161 at a fourth preset angle, or the second middle section 163 and the third welding section 161 have a fourth preset angle, which can be between 0 degrees and 90 degrees (including 90 degrees). For example, the fourth preset angle can be 10 degrees, 20 degrees, 30 degrees, 40 degrees, 50 degrees, 60 degrees, 70 degrees, 80 degrees, 90 degrees, etc.

[0122] In some examples, the second middle section 163 may be perpendicular to the fifth direction, and the third welding section 161 and the fourth welding section 221 may be parallel to the fifth direction, where the fifth direction is the thickness direction of the battery. In other words, the second middle section 163 may be perpendicular to the fifth direction, and the third welding section 161 and the fourth welding section 221 may be parallel to the fifth direction.

[0123] It should be noted that Figure 4 The structure shown is different in that Figure 7 The welded portion between the inner negative electrode tab 160 and the outer negative electrode tab 220 can be bent, which has high reliability and makes the battery 40 safer.

[0124] Combine Figure 6 and Figure 7 As can be seen, within the battery, the end of the inner tab away from the electrode assembly 41 can be bent, and the end of the outer tab extending into the aluminum-plastic film 42 can also be bent. Bend- ing the welded portions can improve the reliability and safety of the battery. However, it should be noted that the first welding segment 151, the second welding segment 211, the third welding segment 161, and the fourth welding segment 221 themselves can have certain height variations or thickness variations, but are generally arranged parallel to the fifth direction.

[0125] Illustratively, the welded portion of the inner electrode tab and the outer electrode tab can be bent vertically, that is, the end of the inner positive electrode tab 150 away from the positive electrode sheet 110 can be bent to form a first welding section 151, so that the first middle section 153 is connected to the first welding section 151 at a certain angle, and the end of the outer positive electrode tab 210 extending into the accommodating cavity can also be bent to form a second welding section 211, and the second welding section 211 is welded to the first welding section 151; the end of the inner negative electrode tab 160 away from the negative electrode sheet 120 can be bent to form a third welding section 161, so that the second middle section 163 is connected to the third welding section 161 at a certain angle, and the end of the outer negative electrode tab 220 extending into the accommodating cavity can also be bent to form a fourth welding section 221, and the fourth welding section 221 is welded to the third welding section 161.

[0126] It should be understood that in the present application, the welding position can be selectively set according to the internal layout of the battery 40. In some cases, the interface between the inner and outer tabs can be set parallel to the thickness direction of the battery. In some cases, the interface between the inner and outer tabs can also be set at a certain angle (for example, 30 degrees, 90 degrees) to the thickness direction of the battery.

[0127] For example, the material of the outer positive tab 210 can be the same as that of the inner positive tab 150, such as an aluminum tab. The material of the outer negative tab 220 can be the same as that of the inner negative tab 160, such as nickel or copper-plated nickel.

[0128] For example, the thickness of the external tabs (including the external positive tab 210 and the external negative tab 220) can be 0.05 mm to 0.1 mm, and the width can be 2 mm to 10 mm. That is, the thickness of the external positive tab 210 can be equal to or approximately equal to the depth H1 of the first weld mark 21, and the thickness of the external negative tab 220 can be equal to or approximately equal to the depth H2 of the second weld mark 22; the width of the external positive tab 210 can be equal to or approximately equal to the dimension L1 of the first weld mark 21; and the width of the external negative tab 220 can be equal to or approximately equal to the dimension L2 of the second weld mark 22.

[0129] It should be understood that the thickness of the outer tab can be equal to the thickness of the inner tab; the width of the outer tab can be set according to the size of the battery 40; the present application does not limit the length of the outer tab, and when specifically set, the length of the outer tab can be cut according to actual needs.

[0130] In some examples, the first plane and the second plane each have a first preset angle with the first direction, where the first direction is the direction in which the inner positive tab 150 is connected to the outer positive tab 210; the third plane and the fourth plane each have a second preset angle with the third direction, where the third direction is the direction in which the inner negative tab 160 is connected to the outer negative tab 220.

[0131] In some examples, the first preset angle may be 90 degrees, and the second preset angle may be 90 degrees.

[0132] For example, Figure 5A As shown, the connecting surface between the second end of the inner positive tab 150 and the first end of the outer positive tab 210 is perpendicular to the first direction, which is the direction in which the inner positive tab 150 and the outer positive tab 210 are connected, and the first direction is perpendicular to the fifth direction.

[0133] For example, Figure 5B As shown, the connecting surface between the second end of the inner negative electrode tab 160 and the first end of the outer negative electrode tab 220 is perpendicular to the third direction, which is the direction in which the inner negative electrode tab 160 and the outer negative electrode tab 220 are connected, and the third direction is perpendicular to the fifth direction.

[0134] For example, Figure 8A As shown, the connecting surface between the second end of the inner positive tab 150 and the first end of the outer positive tab 210 is perpendicular to the first direction, which is the direction in which the inner positive tab 150 and the outer positive tab 210 are connected, and the first direction is parallel to the fifth direction.

[0135] For example, Figure 8B As shown, the connecting surface between the second end of the inner negative electrode tab 160 and the first end of the outer negative electrode tab 220 is perpendicular to the third direction, which is the direction in which the inner negative electrode tab 160 and the outer negative electrode tab 220 are connected, and the first direction is parallel to the fifth direction.

[0136] It should be understood that the interface between the second end of the inner tab and the first end of the outer tab can be a plane, and the interface or welding surface between the second end of the inner tab and the first end of the outer tab can be perpendicular to the first direction, thereby reducing the volume occupied by welding and improving the energy density of the battery.

[0137] In some examples, the first preset angle and the second preset angle may range from 0 degrees to 90 degrees. For example, the first preset angle may be 30°, and the second preset angle may be 30°.

[0138] For example, the end surface of the second end of the inner positive tab 150 can be a bevel (such as a 30° angle with the first direction), and the end surface of the first end of the outer positive tab 210 can also be a bevel (such as a 60° angle with the first direction), and the two bevels can be spliced ​​together.

[0139] It should be understood that the contact surface or welding surface of the second end of the inner tab and the first end of the outer tab is at a preset angle to the first direction, that is, the contact surface or welding surface may not be set horizontally or vertically, but inclined, which can also reduce the volume occupied by the weld to a certain extent, thereby improving the energy density of the battery.

[0140] In some examples, combined Figure 3 、 Figure 4 、 Figure 6 and Figure 7 As can be seen, the outer surfaces of both the first weld mark 12 and the second weld mark 22 can be coated with tab sealant 190. That is, the outer surface of the first weld mark 12 formed by welding the inner positive tab 150 to the outer positive tab 210 can be coated with tab sealant 190; the outer surface of the second weld mark 22 formed by welding the inner negative tab 160 to the outer negative tab 220 can also be coated with tab sealant 190. This seals the weld area, preventing burrs on the first weld mark 12 and the second weld mark 22 from puncturing the aluminum-plastic film 42, thereby improving the safety of the battery 40.

[0141] Illustratively, the tab sealant 190 may completely cover the first weld mark 12 and the second weld mark 22 to seal the first weld mark 12 and the second weld mark 22 and prevent the first weld mark 12 and the second weld mark 22 from falling off.

[0142] In some examples, the thickness of the tab sealant 190 may range from 0.01 mm to 1 mm. For example, when the welding portion between the inner tab and the outer tab is horizontally extended, as shown in FIG. Figure 3 and Figure 4 As shown, the size range of the tab sealant 190 along the thickness direction of the battery is 0.01mm-1mm; when the welding part between the inner tab and the outer tab is bent vertically, as shown in FIG. Figure 6 and Figure 7 As shown, the dimension of the tab sealant 190 along the thickness direction of the second welding section 211 of the outer positive tab 210 ranges from 0.01 mm to 1 mm.

[0143] It should be understood that tab sealant 190 plays a crucial role in lithium-ion batteries. It is primarily responsible for preventing short circuits between the positive and negative tabs and the battery casing during the battery packaging process, while also ensuring that the electrolyte inside the battery does not leak. The material of tab sealant 190 is typically required to have good insulation properties, chemical stability, and thermal stability.

[0144] Exemplarily, the tab sealant 190 can be made of polypropylene glue (i.e., PP glue). PP tab sealants have excellent adhesion and chemical stability, and the welding area can be sealed by using PP hot melt. It should be understood that by coating the outer surface of the weld mark 12 with the tab sealant 190, the battery 40 can avoid the potential threat of burrs from the weld mark 12 to the aluminum-plastic film 42 by manually applying adhesive tape. Moreover, since it can be produced in a mechanized manner, the processing efficiency of the battery 40 can also be improved. At the same time, since the tab sealant 190 formed by the dispensing method will not easily bounce off and fall off, the protective effect can be improved.

[0145] In some examples, combined Figure 3 、 Figure 4 、 Figure 6 and Figure 7 As can be seen, a cover glue 180 can be provided at one end of the electrode assembly 41. The cover glue 180 and the inner tab are provided at the same end of the electrode assembly 41. The cover glue 180 can be used to cover the inner positive tab 150 and the inner negative tab 160, preventing burrs on the edges of the inner positive tab 150 and the inner negative tab 160 from causing short circuits, corrosion, and other problems.

[0146] For example, a UV curable adhesive can be used as the cover adhesive 180. It should be understood that during the process of manufacturing the battery 40, the UV curable adhesive can be mechanically applied to one end of the electrode assembly 41 and then cured by UV light, thereby improving the manufacturing efficiency of the battery 40.

[0147] In the battery 40, by wrapping one end of the electrode assembly 41 (i.e., the end provided with the inner positive tab 150 and / or the inner negative tab 160) with a cover sheet adhesive 180, the aluminum-plastic film 42 is prevented from contacting the positive electrode sheet 110 and the negative electrode sheet 120. This prevents burrs formed on the positive electrode sheet 110 and the negative electrode sheet 120 due to cutting or other reasons from puncturing the aluminum-plastic film 42, thereby effectively preventing damage to 42 and improving the safety of the battery 40. Furthermore, because one end of the electrode assembly 41 is separated from the aluminum-plastic film 42 by the cover sheet adhesive 180, the thermal expansion and contraction of the positive electrode sheet 110 and / or the negative electrode sheet 120 caused by temperature changes during the charge and discharge process of the battery 40 or due to other reasons will not easily cause the aluminum-plastic film 42 to be punctured, thereby also improving the safety of the battery 40.

[0148] 9A to 9D Schematic diagram of a preparation process of a battery 40 provided in an embodiment of the present application. 9A to 9D Shown is Figure 4 Schematic diagram of the preparation process of battery 40 shown.

[0149] like Figure 9AAs shown, in this step, the electrode assembly 41 and the inner negative electrode tab 160 can be obtained.

[0150] The electrode assembly 41 may be a laminated electrode assembly, that is, the electrode assembly 41 may be formed by laminating a positive electrode sheet 110, a separator 140, and a negative electrode sheet 120. One end of the positive electrode sheet 110 may be coated with an insulating coating 170 to prevent a short circuit between the positive and negative electrodes.

[0151] An inner negative electrode tab 160 is connected to one end of the electrode assembly 41. The multiple second connecting segments 162 of the inner negative electrode tab 160 can be electrically connected to the multiple negative electrode sheets 120 respectively. The end of the inner negative electrode tab 160 away from the negative electrode sheet 120 can be gathered together and pre-welded by ultrasonic welding to form a third welding segment 161 with a thickness of about 0.1 mm.

[0152] like Figure 9B As shown, in this step, the end surface of the third welding section 161 of the inner negative electrode tab 160 can be brought into contact with the end surface of the outer negative electrode tab 220 and spliced ​​together, and then a second weld mark 22 can be formed on the weld surface by pulse laser welding.

[0153] Exemplarily, this step specifically includes the following operations: first, the third welding section 161 of the inner negative electrode ear 160 and the outer negative electrode ear 220 (or the fourth welding section 221 of the outer negative electrode ear 220) are placed on the jig respectively, and the third welding section 161 of the inner negative electrode ear 160 and the outer negative electrode ear 220 are controlled to be on the same plane, and the end face of the third welding section 161 of the inner negative electrode ear 160 and the end face of the outer negative electrode ear 220 are tightly spliced, and the splicing gap is less than 10 microns; then, the two end faces can be realized by pulse laser The second weld mark 22 is formed at the junction of the inner negative electrode ear 160 and the outer negative electrode ear 220. The size range of the second weld mark 22 along the third direction (i.e., the width range and the weld width range of the second weld mark 22) can be 0.1 mm to 1 mm, and the size range of the second weld mark 22 along the fourth direction (i.e., the depth range and the weld depth of the second weld mark 22) is 0.05 mm to 0.1 mm. The third direction is the direction in which the inner negative electrode ear 160 and the outer negative electrode ear 220 are connected, and the fourth direction is the thickness direction of the outer negative electrode ear 220.

[0154] like Figure 9C As shown, in this step, the area to be composited can be laser cleaned, and the tab sealant 190 can be hot-pressed on the welding area. The tab sealant 190 can be PP glue. The tab sealant 190 at least wraps the outer surface of the second weld mark 22 to prevent the welding area from falling off.

[0155] like Figure 9DAs shown, in this step, a cover glue 180 is first applied to the outer side of the inner negative tab 160. The cover glue 180 can cover the inner negative tab 160 to prevent burrs on the edge of the inner negative tab 160 from causing short circuits, corrosion, and other problems. Then, the aluminum-plastic film 42 is applied to achieve the overall sealing of the battery 40. The aluminum-plastic film 42 covers the electrode assembly 41 and the inner electrode sheet, and seals the electrode assembly 41 and the inner electrode sheet.

[0156] Exemplarily, the preparation method further includes: injecting an electrolyte into the aluminum-plastic film 42 . The specific type of the electrolyte can refer to the electrolyte used in batteries in the prior art and is not specifically limited in the present invention.

[0157] It should be understood that the above mainly combines 9A to 9D The preparation process of electrically connecting the negative electrode of the battery to the external device is introduced. The preparation process of electrically connecting the positive electrode of the battery to the external device can also be similarly referred to the above content and will not be repeated here.

[0158] The above is only a brief introduction to an optional preparation method of the battery of this embodiment. Those skilled in the art can make a battery with the same structure as this embodiment by simple transformation based on the above preparation method. Therefore, the above preparation method should not be regarded as a specific limitation to this embodiment.

[0159] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A battery, characterized in that: include: An electrode assembly (41), an inner positive electrode tab (150), an inner negative electrode tab (160), an aluminum-plastic film (42), an outer positive electrode tab (210), an outer negative electrode tab (220), and an electrolyte (130), wherein: The electrode assembly (41) comprises a positive electrode sheet (110), a negative electrode sheet (120), and a separator (140) disposed between the positive electrode sheet (110) and the negative electrode sheet (120); The first end of the inner positive electrode tab (150) is electrically connected to the positive electrode sheet (110), and the second end of the inner positive electrode tab (150) is electrically connected to the outer positive electrode tab (210); the first end of the inner negative electrode tab (160) is electrically connected to the negative electrode sheet (120), and the second end of the inner negative electrode tab (160) is electrically connected to the outer negative electrode tab (220); The aluminum-plastic film (42) covers and seals the electrode assembly (41), the inner positive electrode tab (150), and the inner negative electrode tab (160) to form a receiving cavity; the electrolyte (130) is located in the receiving cavity; The first end of the external positive electrode tab (210) is inserted into the accommodating cavity and electrically connected to the internal positive electrode tab (150), and the second end of the external positive electrode tab (210) is exposed outside the accommodating cavity; the first end of the external negative electrode tab (220) is inserted into the accommodating cavity and electrically connected to the internal negative electrode tab (160), and the second end of the external negative electrode tab (220) is exposed outside the accommodating cavity; The end surface of the second end of the inner positive electrode tab (150) is a first plane, the end surface of the first end of the outer positive electrode tab (210) is a second plane, and the first plane and the second plane are connected via a first weld mark (12); The end surface of the second end of the inner negative electrode tab (160) is a third plane, the end surface of the first end of the outer negative electrode tab (220) is a fourth plane, and the third plane and the fourth plane are connected via a second weld mark (22).

2. The battery according to claim 1, characterized in that The size of the first weld mark (12) along the first direction is in the range of 0.1 mm to 1 mm, and the size of the first weld mark (12) along the second direction is in the range of 0.05 mm to 0.1 mm, the first direction being the direction in which the inner positive electrode tab (150) is connected to the outer positive electrode tab (210), and the second direction being the thickness direction of the outer positive electrode tab (210); The size range of the second weld mark (22) along the third direction is 0.1 mm-1 mm, and the size range of the second weld mark (22) along the fourth direction is 0.05 mm-0.1 mm, the third direction is the direction in which the inner negative electrode ear (160) is connected to the outer negative electrode ear (220), and the fourth direction is the thickness direction of the outer negative electrode ear (220).

3. The battery according to claim 1, characterized in that The first plane and the second plane respectively have a first preset angle with a first direction, and the first direction is the direction in which the inner positive electrode tab (150) and the outer positive electrode tab (210) are connected; The third plane and the fourth plane respectively have a second preset angle with a third direction, and the third direction is the direction in which the inner negative electrode tab (160) is connected to the outer negative electrode tab (220).

4. The battery according to claim 3, characterized in that The first preset angle is 90 degrees, and the second preset angle is 90 degrees.

5. The battery according to any one of claims 1 to 4, characterized in that The inner positive electrode tab (150) includes a first welding section (151), and the outer positive electrode tab (210) includes a second welding section (211), the first welding section (151) and the second welding section (211) are located on both sides of the first weld mark (12), the end surface (1511) of the first welding section (151) away from the electrode assembly (41) is the first plane, and the end surface (2111) of the second welding section (211) close to the first welding section (151) is the second plane; The first surface (1512) of the first welding section (151) and the first surface (2112) of the second welding section (211) are located on the same plane, and the second surface (1513) of the first welding section (151) and the second surface (2113) of the second welding section (211) are located on the same plane; The inner negative electrode ear (160) includes a third welding section (161), and the outer negative electrode ear (220) includes a fourth welding section (221). The third welding section (161) and the fourth welding section (221) are located on both sides of the second weld mark (22). The end surface (1611) of the third welding section (161) away from the electrode assembly (41) is the third plane, and the end surface (2211) of the fourth welding section (221) close to the third welding section (161) is the fourth plane. The first surface (1612) of the third welding segment (161) and the first surface (2212) of the fourth welding segment (221) are located on the same plane, and the second surface (1613) of the third welding segment (161) and the second surface (2213) of the fourth welding segment (221) are located on the same plane.

6. The battery according to claim 5, characterized in that The inner positive electrode tab (150) further includes a first connecting section (152), the first connecting section (152) being connected between the positive electrode sheet (110) and the first welding section (151), the connection direction between the first welding section (151) and the second welding section (211) being perpendicular to a fifth direction, the fifth direction being the thickness direction of the battery; The inner negative electrode tab (160) includes a second connecting section (162), the second connecting section (162) is connected between the negative electrode sheet (120) and the third welding section (161), and the connection direction between the third welding section (161) and the fourth welding section (221) is perpendicular to the fifth direction.

7. The battery according to claim 5, characterized in that The inner positive electrode tab (150) further comprises a first connecting section (152) and a first middle section (153), wherein the first middle section (153) is connected between the first connecting section (152) and the first welding section (151), the first connecting section (152) is used to connect the positive electrode sheet (110), and the first middle section (153) is connected to the first welding section (151) at a third preset angle; The inner negative electrode ear (160) further includes a second connecting section (162) and a second middle section (163), wherein the second middle section (163) is connected between the second connecting section (162) and the third welding section (161), and the second connecting section (162) is used to connect the negative electrode sheet (120), and the second middle section (163) is connected to the third welding section (161) at a fourth preset angle.

8. The battery according to any one of claims 1 to 4, characterized in that The outer surfaces of the first weld mark (12) and the second weld mark (22) are both wrapped with tab sealant (190).

9. The battery according to claim 8, characterized in that The tab sealant (190) completely covers the first weld mark (12) and the second weld mark (22).

10. The battery according to claim 9, characterized in that The tab sealant (190) is polypropylene glue.

11. The battery according to any one of claims 1 to 4, characterized in that The electrode assembly (41) is formed by alternately stacking the positive electrode sheet (110), the separator (140) and the negative electrode sheet (120); Alternatively, the electrode assembly (41) is formed by alternately stacking and winding the positive electrode sheet (110), the separator (140) and the negative electrode sheet (120).

12. An electronic device, characterized in that: Comprising the battery according to any one of claims 1 to 11.

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