Batteries and electronic devices

Abstract

This disclosure relates to a battery and an electronic device, wherein the battery includes a negative electrode and a positive electrode. The negative electrode and the positive electrode are stacked. The positive electrode has multiple bent concave-convex structures. By providing multiple concave-convex structures on the positive electrode, the gap between the positive electrode and the negative electrode is increased, providing space for the expansion deformation of the negative electrode when it expands, thereby preventing the battery as a whole from expanding.

Description

Technical Field

[0001] This disclosure relates to the field of energy storage technology, and more particularly to a battery and electronic device. Background Technology

[0002] A battery is mainly composed of a positive electrode, a negative electrode, and an electrolyte. During battery cycling, the negative electrode will thicken, which will cause the battery as a whole to expand. Utility Model Content

[0003] To overcome the problems existing in the related technologies, this disclosure provides a battery and an electronic device.

[0004] According to some embodiments of this disclosure, a battery is provided, including: a negative electrode sheet; and a positive electrode sheet, which is stacked on top of the negative electrode sheet, the positive electrode sheet having a plurality of bent concave-convex structures.

[0005] In some embodiments, the stacked positive and negative electrode sheets are wound to form a battery cell, the battery cell having a flat region and a bent region; the concave-convex structure is located in the flat region and / or the bent region.

[0006] In some embodiments, the positive electrode sheet includes a positive current collector and a positive active layer located on the positive current collector; the thickness of the uneven structure is less than or equal to the thickness of the positive active layer.

[0007] In some embodiments, the thickness of the positive electrode is greater than or equal to 30 μm and less than or equal to 100 μm.

[0008] In some embodiments, the thickness of the uneven structure is greater than or equal to 5 μm and less than or equal to 20 μm.

[0009] In some embodiments, the negative electrode sheet includes a negative current collector and a negative active layer located on the negative current collector; the ratio between the volatile capacity of the negative active layer and the volatile capacity of the positive active layer is greater than or equal to 1 and less than or equal to 1.08.

[0010] In some embodiments, the concave-convex structure has a plurality of protruding portions and / or a plurality of recessed portions, the plurality of protruding portions and / or the plurality of recessed portions being arranged in a matrix and located on the side of the positive electrode sheet facing the negative electrode sheet.

[0011] In some embodiments, the protruding portion and / or recessed portion of the concave-convex structure is arc-shaped.

[0012] In some embodiments, the positive electrode sheet is formed by rolling a convex pressure roller with a rubber back roller to form the concave-convex structure.

[0013] According to some embodiments of this disclosure, an electronic device is provided, including: the battery described in any of the above embodiments.

[0014] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects: the negative electrode and the positive electrode are stacked, and the positive electrode has multiple bent concave-convex structures. By providing multiple concave-convex structures on the positive electrode, the gap between the positive electrode and the negative electrode is increased, providing space for the expansion deformation of the negative electrode when it expands, thereby preventing the battery from expanding as a whole. It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and do not limit this disclosure. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0016] Figure 1 This is a schematic diagram of the battery structure in related technologies.

[0017] Figure 2 This is a schematic diagram of the structure of a battery according to some embodiments of the present disclosure.

[0018] Figure 3 This is a schematic diagram comparing the structure of related technologies with some embodiments of this disclosure.

[0019] Figure 4 This is a schematic diagram of the structure of a battery cell according to some embodiments of the present disclosure.

[0020] Figure 5 This is a schematic diagram of the structure of a battery cell according to some embodiments of the present disclosure.

[0021] Figure 6 This is a block diagram illustrating an electronic device according to some embodiments of the present disclosure. Detailed Implementation

[0022] Some embodiments of this disclosure will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. Various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding this disclosure. For example, the order of operations described herein is merely illustrative and is not limited to those orders set forth herein, but can be changed as will become apparent upon understanding this disclosure, except for operations that must be performed in a particular order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0023] The embodiments described in the following examples of this disclosure are not representative of all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0024] The batteries provided in some embodiments of this disclosure are used in electronic devices to provide electrical energy to the electronic devices.

[0025] Figure 1 This is a schematic diagram of the battery structure in related technologies. For example... Figure 1 As shown, the battery in the relevant technology mainly consists of a positive electrode 2, a negative electrode 1, and an electrolyte, wherein the positive electrode 2 and the negative electrode 1 are stacked. Taking a lithium-ion battery as an example, during battery cycling, due to the different orientations of the needle-like coke grains inside the graphite material of the negative electrode 1, anisotropic volume expansion occurs during charging. Cracks or internal pores appear inside the graphite particles. The intergranular cracks formed during charging provide pathways for electrolyte penetration, which in turn leads to the expansion of the graphite particles. The graphite particles repeatedly expand and contract. The adhesive used to bond the positive electrode 2 and the negative electrode 1 undergoes repeated stretching and contraction, which can lead to chain breakage and ultimately fail to restrain the expansion of the graphite particles, resulting in the overall expansion of the battery.

[0026] In view of this, some embodiments of the present disclosure provide a battery and an electronic device. By providing a concave-convex structure 21 on the positive electrode 2, space is provided for the negative electrode 1 to expand when particles expand, thereby reducing the overall expansion of the battery caused by the expansion of particles in the negative electrode 1.

[0027] Figure 2 This is a schematic diagram of the structure of a battery according to some embodiments of the present disclosure, such as... Figure 2 As shown, the battery includes a negative electrode 1 and a positive electrode 2. The negative electrode 1 and the positive electrode 2 are stacked, and the positive electrode 2 has multiple bent concave-convex structures 21. The positive electrode 2 is bent to change its local structure to form the concave-convex structures 21, which create protruding portions 211 and recessed portions 212 on the side of the positive electrode 2. When the positive electrode 2 and the negative electrode 1 are stacked, the protruding portions 211 of the concave-convex structures 21 can support the negative electrode 1, increasing the gap between the positive electrode 2 and the negative electrode 1. Therefore, when the negative electrode 1 expands, there is more space between the positive electrode 2 and the negative electrode 1 to accommodate the deformation of the negative electrode 1, thus preventing the battery from expanding overall.

[0028] Figure 3 This is a schematic diagram comparing the structure of related technologies with some embodiments of this disclosure. For example... Figure 3As shown, in related technologies, both the positive electrode 2 and the negative electrode 1 are relatively flat sheet structures. When the positive electrode 2 and the negative electrode 1 are stacked, a separator is provided between them to avoid direct contact and short circuit. This creates a first gap distance L1 between the positive electrode 2 and the negative electrode 1. In some embodiments of this disclosure, since the positive electrode 2 has multiple concave and convex structures 21, the protruding portions 211 of the concave and convex structures can support the negative electrode after the positive electrode 2 and the negative electrode 1 are stacked. That is, the second gap distance L2 between the positive electrode 2 and the negative electrode 1 is the sum of L1 and L3. Here, L1 is the first gap distance between the positive electrode 2 and the negative electrode 1, and L3 is the height of the protruding portion 211 in the thickness direction of the positive electrode 2.

[0029] In this embodiment of the present disclosure, by providing a concave-convex structure 21 on the positive electrode 2, the gap distance between the positive electrode 2 and the negative electrode 1 is increased. This not only provides space to accommodate the deformation of the negative electrode 1 during expansion, but also improves the electrolyte distribution between the positive electrode 2 and the negative electrode 1, increases the residual liquid amount, and thus improves the battery dynamic performance.

[0030] The battery in this embodiment is a wound battery, wherein the positive electrode 2 and the negative electrode 1 are stacked, and the stacked positive electrode 2 and negative electrode 1 are wound together to form a cell 3. The main shape of the battery is determined by the cell 3 formed by the winding. Therefore, when the stacked positive electrode 2 and negative electrode 1 are wound together, there will be areas with a large degree of bending and areas with a small degree of bending.

[0031] Figure 4 This is a schematic diagram of the structure of a battery cell 3 according to some embodiments of the present disclosure. Figure 5 This is a schematic diagram illustrating the structure of a battery cell 3 according to some embodiments of this disclosure. For example... Figure 4 and Figure 5 As shown, the flat area 31 of the cell 3 is the region with less bending when the stacked positive electrode 2 and negative electrode 1 are wound together. The bending area 32 of the cell 3 is the region with greater bending when the stacked positive electrode 2 and negative electrode 1 are wound together.

[0032] In some embodiments, such as Figure 4 As shown, the concave-convex structure 21 is located in the flat region 31 and the bent region 32 of the cell 3, respectively. This can also be understood as the concave-convex structure 21's vertical projection along the thickness direction of the positive electrode 2 being located in the flat region 31 and the bent region 32, respectively. The location of the concave-convex structure 21 in the flat region 31 and the bent region 32 of the cell 3 provides greater space for the negative electrode 1 to expand.

[0033] In some embodiments, such as Figure 5 As shown, the uneven structure 21 is located in the bending region 32 of the cell 3, that is, in the region where the positive electrode 2 is more bent. When the positive electrode 2 and the negative electrode 1 are wound, the uneven stress in the region with greater bending causes the gap between the positive electrode 2 and the negative electrode 1 to decrease, further worsening electrolyte wetting. This results in a larger ratio (N / P) between the volatile capacity of the negative electrode active layer and the volatile capacity of the positive electrode active layer, making the negative electrode 1 in this region more prone to lithium plating and expansion. By placing the uneven structure 21 in the bending region 32 of the cell 3, the gap between the positive electrode 2 and the negative electrode 1 in the bending region 32 is increased, thereby improving the electrolyte retention in the bending region 32 and mitigating lithium plating and expansion, thus preventing battery cycle capacity loss.

[0034] In some embodiments, the concave-convex structure 21 is located in the flat region 31 of the cell 3, that is, the concave-convex structure 21 is disposed in the region where the bending degree of the positive electrode sheet 2 is small, which helps to reduce the overall volume of the cell 3 formed after winding.

[0035] In some embodiments, the positive electrode 2 includes a positive current collector and a positive active layer located on the positive current collector. The positive current collector is used for conducting electricity and collecting current. The positive active layer is used to obtain and store energy through a reduction reaction during discharge for use by electronic devices.

[0036] In some embodiments, the positive electrode current collector is a copper-aluminum foil. A positive electrode active layer is formed by coating the surface of the copper-aluminum foil with a positive electrode active material. This disclosure does not specifically limit the positive electrode active material.

[0037] In this embodiment, the positive electrode sheet 2 is rolled to bend its structure, forming a concave-convex structure 21. During the rolling process, a raised roller and a rubber back roller are used to roll the positive electrode sheet 2. The raised points of the raised roller cause the positive electrode sheet 2 to deform under pressure, forming corresponding protruding portions 211 and recessed portions 212. This embodiment employs a rolling process, which is relatively simple and has high manufacturing efficiency.

[0038] In some embodiments, the thickness of the uneven structure 21 formed by roll forming is less than or equal to the thickness of the positive electrode active layer, so as to avoid the positive electrode active layer of the positive electrode sheet 2 being damaged by the bump roller when a thicker uneven structure 21 is prepared by roll forming.

[0039] The thickness of the concave-convex structure 21 is the difference between the overall thickness of the positive electrode 2 after roll forming and the thickness of the positive electrode 2 before roll forming.

[0040] In some embodiments, the thickness of the uneven structure 21 is greater than or equal to 5 μm, so as to form a sufficiently large gap between the positive electrode 2 and the negative electrode 1 to accommodate the expansion generated by the negative electrode 1. Furthermore, the thickness of the uneven structure 21 is less than or equal to 20 μm, so as to avoid the large protrusions on the protrusion roller damaging the positive electrode active layer of the positive electrode 2 when a thicker uneven structure 21 is prepared by roll forming.

[0041] In some embodiments, the thickness of the positive electrode 2 is the sum of the thickness of the positive current collector and the thickness of the positive active layer. Specifically, the thickness of the positive electrode 2 is greater than or equal to 30 μm and less than or equal to 100 μm, ensuring that the thickness of the positive electrode 2 is within a reasonable range to balance the energy density and charge / discharge performance of the battery.

[0042] In some embodiments, matching the structure of the positive electrode 2, the negative electrode 1 includes a negative current collector and a negative active layer located on the negative current collector. The negative current collector is used for conducting electricity and collecting current, and the negative active layer is used for undergoing an oxidation reaction during discharge to release energy.

[0043] In some embodiments, the negative electrode current collector is a copper-aluminum foil, and a negative electrode active layer is formed by coating the surface of the copper-aluminum foil with a negative electrode active material. This disclosure does not specifically limit the negative electrode active material.

[0044] In some embodiments, the ratio between the volatile capacity of the negative electrode active layer and the volatile capacity of the positive electrode active layer is greater than or equal to 1 to avoid the risk of lithium plating caused by an excessively small ratio. Furthermore, the ratio between the volatile capacity of the negative electrode active layer and the volatile capacity of the positive electrode active layer is less than or equal to 1.08 to avoid the waste of internal battery space caused by an excessively large ratio.

[0045] In some embodiments, the convex-concave structure 21 has a plurality of protruding portions 211 and / or a plurality of recessed portions 212. For example... Figure 2 As shown, the protruding portion 211 on one side of the positive electrode 2 has a corresponding recessed portion 212 on the other side of the positive electrode 2. Similarly, the recessed portion 212 on one side of the positive electrode 2 has a corresponding protruding portion 211 on the other side of the positive electrode 2. It can be understood that the vertical projection of the protruding portion 211 in the thickness direction of the positive electrode 2 is completely located within the vertical projection of the recessed portion 212 in the thickness direction of the positive electrode 2, or the vertical projection of the protruding portion 211 in the thickness direction of the positive electrode 2 and the vertical projection of the recessed portion 212 in the thickness direction of the positive electrode 2 partially coincide.

[0046] In this configuration, multiple protruding portions 211 and / or multiple recessed portions 212 are arranged in a matrix on the side of the positive electrode 2 facing the negative electrode 1. For example, in one side of the positive electrode 2, the multiple protruding portions 211 are arranged in a matrix, making the gap distance between the positive electrode 2 and the negative electrode 1 more uniform, thereby improving the distribution of electrolyte between the positive electrode 2 and the negative electrode 1.

[0047] In some embodiments, the protruding portion 211 of the convex-concave structure 21 is a circular protrusion, and correspondingly, the recessed portion 212 is a circular recess.

[0048] In other embodiments, the protruding portion 211 of the convex-concave structure 21 is an elongated protrusion, and the corresponding recessed portion 212 is an elongated groove.

[0049] In some embodiments, the protruding portion 211 and / or the recessed portion 212 of the uneven structure 21 are arc-shaped. That is, the protrusions on the convex roller used to roll the positive electrode sheet 2 are smooth protrusions to reduce the risk of damaging the positive electrode active layer on the positive electrode sheet 2. Furthermore, the arc-shaped protrusions 211 and / or the recessed portion 212 can avoid damage to the positive electrode sheet 2 caused by stress concentration.

[0050] In some embodiments, the battery further includes an electrolyte. In related technologies, the electrolyte retention capacity varies depending on the battery material system for different charging powers, and is typically between 5g and 15g. In this embodiment, to avoid accelerated battery cycle capacity decay due to excessively low electrolyte retention and decreased battery safety and reliability due to excessively high electrolyte retention, the electrolyte retention capacity of the battery is set to a range between 5g and 15g. For example, the electrolyte retention capacity of the battery is set to be greater than or equal to 5g and less than or equal to 8g.

[0051] Based on the same inventive concept, this disclosure also provides an electronic device, including: a battery according to any of the above embodiments. The battery increases the gap between the positive electrode 2 and the negative electrode 1 by providing multiple uneven structures 21 on the positive electrode 2, providing space for the negative electrode 1 to expand, thereby preventing the battery from expanding and compressing the screen or back cover of the electronic device.

[0052] Figure 6 This is a block diagram illustrating an electronic device 800 according to some embodiments of the present disclosure. For example, the electronic device 800 may be a mobile phone, computer, digital broadcasting terminal, messaging device, game console, tablet device, medical device, fitness equipment, personal digital assistant, etc.

[0053] Reference Figure 6The electronic device 800 may include one or more of the following components: processing component 802, memory 804, power supply component 806, multimedia component 808, audio component 810, input / output (I / O) interface 812, sensor component 814, and communication component 816.

[0054] Processing component 802 typically controls the overall operation of electronic device 800, such as operations associated with display, telephone calls, data communication, camera operation, and recording operations. Processing component 802 may include one or more processors 820 to execute instructions to complete all or part of the steps of the methods described above. Furthermore, processing component 802 may include one or more modules to facilitate interaction between processing component 802 and other components. For example, processing component 802 may include a multimedia module to facilitate interaction between multimedia component 808 and processing component 802.

[0055] Memory 804 is configured to store various types of data to support the operation of electronic device 800. Examples of this data include instructions for any application or method operating on electronic device 800, contact data, phonebook data, messages, pictures, videos, etc. Memory 804 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0056] Power supply component 806 provides power to various components of electronic device 800. Power supply component 806 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to electronic device 800.

[0057] Multimedia component 808 includes a screen that provides an output interface between the electronic device 800 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touchscreen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors may sense not only the boundaries of the touch or swipe action but also the duration and pressure associated with the touch or swipe operation. In some embodiments, multimedia component 808 includes a front-facing camera and / or a rear-facing camera. When the electronic device 800 is in an operating mode, such as a shooting mode or a video mode, the front-facing camera and / or the rear-facing camera may receive external multimedia data. Each front-facing camera and rear-facing camera may be a fixed optical lens system or have focal length and optical zoom capabilities.

[0058] Audio component 810 is configured to output and / or input audio signals. For example, audio component 810 includes a microphone (MIC) configured to receive external audio signals when electronic device 800 is in an operating mode, such as call mode, recording mode, and voice recognition mode. The received audio signals may be further stored in memory 804 or transmitted via communication component 816. In some embodiments, audio component 810 also includes a speaker for outputting audio signals.

[0059] I / O interface 812 provides an interface between processing component 802 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to, home buttons, volume buttons, power buttons, and lock buttons.

[0060] Sensor assembly 814 includes one or more sensors for providing state assessments of various aspects of electronic device 800. For example, sensor assembly 814 can detect the on / off state of electronic device 800, the relative positioning of components such as the display and keypad of electronic device 800, changes in position of electronic device 800 or a component of electronic device 800, the presence or absence of user contact with electronic device 800, orientation or acceleration / deceleration of electronic device 800, and temperature changes of electronic device 800. Sensor assembly 814 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. Sensor assembly 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, sensor assembly 814 may also include an accelerometer, gyroscope, magnetometer, pressure sensor, or temperature sensor.

[0061] Communication component 816 is configured to facilitate wired or wireless communication between electronic device 800 and other devices. Electronic device 800 can access wireless networks based on communication standards, such as WiFi, 3G, 4G, 5G, other communication standards, or combinations thereof. In some embodiments of this disclosure, communication component 816 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In some embodiments of this disclosure, communication component 816 further includes a near-field communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on radio frequency identification (RFID) technology, Infrared Data Association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0062] In some embodiments of this disclosure, the electronic device 800 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the methods described above.

[0063] In the above detailed description, reference has been made to the accompanying drawings, which illustrate specific aspects of this disclosure by way of illustration. In this regard, terms indicating direction or positional relationship, such as “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential,” are used with reference to the orientation of the described figures. Since components of the described device can be positioned in multiple different orientations, directional terms are used for illustrative purposes and not for limitation. It should be understood that other aspects can be utilized and structural or logical changes can be made without departing from the concept of this disclosure. Therefore, the following detailed description should not be considered limiting.

[0064] It should be understood that, unless otherwise specifically indicated, features of various embodiments of this disclosure described herein can be combined with each other. As used herein, the term "and / or" includes any of the associated listed items and any combination of any two or more; it should be understood that, unless otherwise expressly specified and limited, the terms "joining," "attaching," "mounting," "connecting," "linking," "fixing," etc., used in the embodiments of this disclosure should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral part; as a mechanical connection, an electrical connection, or a communicative connection; as a direct connection or an indirect connection through an intermediate medium; as a connection within two elements or an interaction between two elements, unless otherwise expressly limited. Those skilled in the art will understand the specific meaning of the above terms herein according to the specific circumstances.

[0065] Furthermore, the term "above" as used herein with respect to components, elements, or material layers formed or located "above" a surface may be used to indicate that the component, element, or material layer is "indirectly" positioned (e.g., placed, formed, deposited, etc.) on the surface such that one or more additional components, elements, or layers are arranged between the surface and the component, element, or material layer. However, the term "above" as used with respect to components, elements, or material layers formed or located "above" a surface may also optionally have a specific meaning: that the component, element, or material layer is "directly" positioned (e.g., placed, formed, deposited, etc.) on the surface, for example, in direct contact with the surface.

[0066] It should be understood that spatial relative terms, such as “above,” “upper,” “below,” and “lower,” are used herein to describe the relationship between one element and another shown in the figures. In addition to the orientation depicted in the figures, these spatial relative terms are also intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is flipped, an element described as “above” or “upper” relative to another element would be “below” or “lower” relative to that other element. Thus, depending on the spatial orientation of the device, the term “above” encompasses both above and below orientations. Devices may have other orientations (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used herein should be interpreted accordingly.

[0067] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited to these terms. Rather, these terms are used only to distinguish one component, part, region, layer, or section from another. Therefore, without departing from the teachings of the examples described herein, a first component, part, region, layer, or section mentioned in the examples may also be referred to as a second component, part, region, layer, or section. Furthermore, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as “first” or “second” may explicitly or implicitly include at least one of that feature.

[0068] In this description, "multiple" means at least two, referring to two or more, such as two, three, etc., unless otherwise explicitly specified. Other quantifiers are similar. The singular forms "a," "the," and "the" are also intended to include the plural forms unless the context clearly indicates otherwise. Furthermore, unless otherwise specified or clearly indicated from the context, the articles "a" and "an" as used in this application and the appended claims are generally understood to mean "one or more."

[0069] It should be understood that, unless otherwise specifically indicated, features of various embodiments of this disclosure described herein can be combined with each other. As used herein, the term "and / or" includes any one of the related listed items and any combination of two or more; "and / or" describes the association relationship between related objects, indicating that three relationships may exist, for example, A and / or B can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. Similarly, "at least one of..." includes any one of the related listed items and any combination of two or more.

[0070] It is further understood that the terms "first," "second," etc., are used to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another, and do not indicate a specific order or degree of importance. In fact, the expressions "first," "second," etc., are completely interchangeable. For example, without departing from the scope of this disclosure, first information can also be referred to as second information, and similarly, second information can also be referred to as first information.

[0071] Furthermore, the term "exemplary" is used herein to indicate that it serves as an example, instance, or illustration. Any aspect or design described herein as "exemplary" is not necessarily to be construed as advantageous compared to other aspects or designs. Rather, the use of the term "exemplary" is intended to present concepts in a concrete manner. As used herein, the term "or" is intended to indicate an inclusive "or" rather than an exclusive "or." That is, unless otherwise specified or clear from the context, "X applies A or B" is intended to indicate any of the natural inclusive permutations. That is, if X applies A; X applies B; or X applies both A and B, then applying A or B satisfies the condition under any of the foregoing instances.

[0072] Similarly, although this disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art upon reading and understanding the specification and drawings. This disclosure includes all such modifications and variations and is limited only by the scope of the claims. In particular, with respect to the various functions performed by the components described above (e.g., elements, resources, etc.), unless otherwise indicated, the terminology used to describe such components is intended to correspond to any component (functionally equivalent) that performs the specific function of the described component, even if it is not structurally equivalent to the disclosed structure. Furthermore, although specific features of this disclosure may have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations, as may be desired and advantageous to any given or particular application. Moreover, with regard to the terms “comprising,” “owning,” “having,” “having,” or variations thereof as used in this disclosure, such terms are intended to be inclusive in a manner similar to the term “including.”

[0073] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the utility model disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein.

[0074] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A battery, characterized by, include: Negative electrode plate; A positive electrode sheet is stacked with the negative electrode sheet. The positive electrode sheet has multiple bent concave and convex structures. The stacked positive electrode sheet and the negative electrode sheet are wound to form a battery cell. The battery cell has a flat area and a bent area. The concave and convex structures are located in the flat area and / or the bent area.

2. The battery of claim 1, wherein, The positive electrode sheet includes a positive current collector and a positive active layer located on the positive current collector; The thickness of the uneven structure is less than or equal to the thickness of the positive electrode active layer.

3. The battery of claim 2, wherein, The thickness of the positive electrode is greater than or equal to 30 μm and less than or equal to 100 μm.

4. The battery of claim 2, wherein, The thickness of the concave-convex structure is greater than or equal to 5 μm and less than or equal to 20 μm.

5. The battery according to claim 2, characterized in that, The negative electrode sheet includes a negative electrode current collector and a negative electrode active layer located on the negative electrode current collector; The ratio between the volatile capacity of the negative electrode active layer and the volatile capacity of the positive electrode active layer is greater than or equal to 1 and less than or equal to 1.

08.

6. The battery according to any one of claims 1 to 5, characterized in that, The concave-convex structure has multiple protruding portions and / or multiple recessed portions, which are arranged in a matrix and located on the side of the positive electrode sheet facing the negative electrode sheet.

7. The battery of claim 6, wherein, The protruding and / or recessed portions of the concave-convex structure are arc-shaped.

8. The battery of claim 6, wherein, The positive electrode sheet is formed by rolling a convex pressure roller and a rubber back roller to create the concave-convex structure.

9. An electronic device, comprising: include: The battery according to any one of claims 1 to 8.

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