WO2022114928A1

WO2022114928A1 - Battery, and electronic device including same

Info

Publication number: WO2022114928A1
Application number: PCT/KR2021/017910
Authority: WO
Inventors: 안성진; 최웅철; 윤종문
Original assignee: 삼성전자 주식회사
Priority date: 2020-11-30
Filing date: 2021-11-30
Publication date: 2022-06-02
Also published as: KR20220075856A

Abstract

According to various embodiments disclosed in the present document, a battery and an electronic device including same may be provided, the battery including: a positive electrode substrate; a positive electrode active material applied to at least one surface of the positive electrode substrate; a negative electrode substrate; a negative electrode active material applied to at least one surface of the negative electrode substrate; a separator positioned between the positive electrode substrate and the negative electrode substrate; and an oxide film layer formed on at least one surface of the positive electrode substrate through surface modification. Various other embodiments are also possible.

Description

Batteries and electronic devices comprising them

Various embodiments disclosed in this document relate to a battery having improved safety in case of an internal short circuit by surface-modifying a positive substrate of the battery, an electronic device including the same, and a manufacturing method thereof.

BACKGROUND ART With the development of information and communication technology and semiconductor technology, the dissemination and use of various electronic devices are rapidly increasing. In particular, recent electronic devices are being developed to be portable and to be able to communicate. Such electronic devices are being miniaturized so that users can conveniently carry them. With the trend of miniaturization of electronic devices, studies are being actively conducted to increase the capacity of the battery or increase the lifespan of the battery so that the user can use the electronic device for a long time. In addition, research to improve battery safety is being actively conducted.

Batteries can be classified according to the material contained in the positive electrode, the negative electrode, or the electrolyte. For example, the battery may include a lithium ion battery, a lithium polymer battery, a nickel cadmium battery, a nickel hydride battery.

As a battery, a lithium ion battery has excellent charge/discharge efficiency and storage capacity, has high output stability, and has a low degree of discharge even when not in use, so it is applied as a core component of a portable electronic device.

Lithium ion batteries widely used in portable electronic devices may damage a battery case (eg, a pouch) when a sharp object such as a nail is dented or a physical shock such as a fall of the electronic device occurs. Safety problems such as internal short-circuit, leakage of electrode assembly, heat generation, ignition and/or explosion may occur due to the above-mentioned physical shock and/or excess of allowable current/voltage, exposure to high temperature, etc. have.

Accordingly, securing the safety of the lithium ion battery corresponds to an important task in the technical field.

In the battery according to some embodiments, the safety function of the battery operates only when the battery temperature rises to a certain temperature (eg, 100 degrees Celsius), and the safety function may not operate in a situation in which the heating temperature is heated at a certain rate or higher. .

In addition, in the battery according to some embodiments, when the battery coating layer is damaged by impact, the safety function may not operate in the damaged area.

According to various embodiments of the present disclosure, safety may be improved by providing a battery including a surface-modified positive electrode substrate.

According to various embodiments disclosed herein, in an electronic device, a housing including a front plate, a rear plate facing in a direction opposite to the front plate, and a side bezel structure surrounding a space between the front plate and the rear plate ; and a battery disposed in the space within the housing, wherein the battery includes: a positive electrode substrate; a positive active material applied to at least one surface of the positive electrode substrate; negative electrode substrate; a negative active material applied to at least one surface of the negative electrode substrate; a separator positioned between the positive electrode substrate and the negative electrode substrate; and an oxide coating layer formed on at least one surface of the cathode substrate through surface modification.

According to various embodiments disclosed herein, a cathode substrate; a positive active material applied to at least one surface of the positive electrode substrate; negative electrode substrate; a negative active material applied to at least one surface of the negative electrode substrate; a separator positioned between the positive electrode substrate and the negative electrode substrate; and an oxide film layer formed on at least one surface of the positive electrode substrate.

According to various embodiments disclosed herein, a communication module; processor; and a battery, wherein the battery comprises: a positive electrode substrate; a positive active material applied to at least one surface of the positive electrode substrate; negative electrode substrate; a negative active material applied to at least one surface of the negative electrode substrate; a separator positioned between the positive electrode substrate and the negative electrode substrate; and an oxide film layer formed on at least one surface of the cathode substrate through surface modification.

According to various embodiments disclosed herein, a cathode substrate; a first positive active material applied to one surface of the positive electrode substrate; and a second positive electrode active material applied to the other surface of the positive electrode substrate; negative electrode substrate; a first negative active material applied to at least one surface of the negative electrode substrate; and a second negative electrode active material applied to the other surface of the negative electrode substrate; a separator positioned between the positive electrode assembly and the negative electrode assembly; and an oxide film layer formed between the positive electrode substrate and the first positive electrode active material and formed through surface modification of the positive electrode substrate.

According to various embodiments of the present disclosure, a cathode substrate; a first positive active material applied to one surface of the positive electrode substrate; and a second positive electrode active material applied to the other surface of the positive electrode substrate; negative electrode substrate; a first negative active material applied to at least one surface of the negative electrode substrate; and a second negative electrode active material applied to the other surface of the negative electrode substrate; a negative electrode assembly comprising a; and a separator positioned between the positive electrode assembly and the negative electrode assembly; the surface of the positive electrode substrate through surface modification of the positive electrode substrate It is possible to provide a battery in which the resistance is increased, but the resistance of the surface-modified positive electrode substrate is 1% to 15% of the total resistance of the positive electrode assembly.

Since the battery according to various embodiments of the present disclosure includes a surface-modified positive electrode substrate, the heating temperature may not rapidly increase when the battery is damaged and a short-circuit is formed.

Since the battery according to various embodiments of the present disclosure includes the surface-modified positive electrode substrate, a safety function operation may be possible even if the battery is damaged and a short-circuit is formed.

Since the battery according to various embodiments of the present disclosure includes the surface-modified positive electrode substrate, even if the battery is damaged and a short-circuit is formed, energy of the battery can be safely consumed without thermal runaway or ignition.

Effects obtainable in the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those of ordinary skill in the art to which the present disclosure belongs from the description below. will be.

1 is an exploded perspective view of an electronic device according to various embodiments disclosed herein.

2 is a diagram illustrating a battery according to various embodiments of the present disclosure.

3 is a diagram illustrating an internal structure of the battery of FIG. 2 according to various embodiments of the present disclosure;

4 is an enlarged view of an internal structure of a battery according to an embodiment.

5 is a conceptual diagram illustrating a state in which a nail is nailed into the battery of FIG. 4 and is damaged.

6 is an enlarged view of an internal structure of a battery according to various embodiments of the present disclosure;

7 is a conceptual diagram illustrating a state in which a nail is nailed into the battery of FIG. 6 and is damaged.

8 is a graph illustrating a heat generation level of a battery according to a short-circuit resistance when the battery is internally short-circuited, according to an embodiment.

FIG. 9A is a diagram illustrating the amount of heat generated by the battery for each short-circuited aspect when the battery is internally short-circuited, according to an exemplary embodiment.

9B is a diagram illustrating a temperature of a battery for each short-circuited aspect when the battery is internally short-circuited, according to an embodiment.

10 is a diagram illustrating a patterned layer according to various embodiments of the present disclosure.

11 is a block diagram illustrating a method for modifying the surface of a cathode substrate according to various embodiments of the present disclosure.

12 is a conceptual diagram illustrating a surface treatment process of a cathode substrate according to various embodiments of the present disclosure.

Examples of the present invention are provided to more completely explain the present invention to those of ordinary skill in the art, and the following examples may be modified in various other forms, and the scope of the present invention is as follows It is not limited to an Example. Rather, these examples are provided so that this disclosure will be more thorough and complete, and will fully convey the spirit of the invention to those skilled in the art.

In the following drawings, the thickness or size of each layer is exaggerated or reduced for convenience and clarity of description, and the same reference numerals in the drawings refer to the same elements. As used herein, the term “and/or” includes any one and all combinations of one or more of those listed items.

1 is an exploded perspective view of an electronic device, according to various embodiments of the present disclosure;

1 and below, a spatial coordinate system defined by an X-axis, a Y-axis, and a Z-axis orthogonal to each other is illustrated. Here, the X axis is the width direction of the electronic device 100 and the battery 150 , the Y axis is the length direction of the electronic device 100 and the battery 150 , and the Z axis is the height (or thickness) of the electronic device 100 and the battery 150 . ) can indicate the direction.

Referring to FIG. 1 , the electronic device 100 includes a front plate 110 , a display 120 , a first support member 130 , a main printed circuit board 140 , a battery 150 , and a second support member ( 160 ), an antenna 170 , and a rear plate 180 . In some embodiments, the electronic device 100 may omit at least one of the components (eg, the first support member 130 or the second support member 160 ) or additionally include other components. .

The electronic device 100 may include a housing 101 including a front surface, a rear surface, and side surfaces surrounding a space between the front surface and the rear surface. According to an embodiment, the front surface may be formed by the front plate 110 (eg, a glass plate including various coating layers or a polymer plate) at least a part of which is substantially transparent. The rear surface may be formed by the rear plate 180 . The rear plate 180 may be formed of, for example, glass, ceramic, polymer, metal (eg, aluminum, stainless steel (STS), or magnesium), or a combination of at least two of the above materials. The side surface is coupled to the front plate 110 and the rear plate 180 , and may be formed by a side bezel structure (or “side member”) 131 including a metal and/or a polymer. In some embodiments, the back plate 180 and the side bezel structure 131 are integrally formed and may include the same material (eg, glass, a metallic material such as aluminum, or ceramic).

The display 120 may visually provide information to the outside (eg, a user) of the electronic device 100 . The display 120 may include, for example, a display, a hologram device, or a projector and a control circuit for controlling the device. According to an embodiment, the display 120 may be visually exposed through, for example, a substantial portion of the front plate 110 . In some embodiments, the edge of the display 120 may be formed to be substantially the same as an adjacent outer shape of the front plate 110 . An audio module, a sensor module, a light emitting element, and a camera that form a recess or an opening in a part of the screen display area (eg, the front side) of the display 120 and are aligned with the recess or the opening It may include at least one or more of the modules. According to an embodiment, the display 120 may include a touch sensor configured to sense a touch or a pressure sensor configured to measure the intensity of a force generated by the touch. In another embodiment (not shown), the display 120 includes a touch sensing circuit, a pressure sensor capable of measuring the intensity (pressure) of a touch, and/or a digitizer for detecting a magnetic field type stylus or pen ( digitizer) or may be disposed adjacent to it.

According to an embodiment, the first support member 130 may be disposed inside the electronic device 100 and connected to the side bezel structure 131 , or may be formed integrally with the side bezel structure 131 . The first support member 130 may be formed of, for example, a metal material and/or a non-metal (eg, polymer) material. The first support member 130 may have a display 120 coupled to one surface and a printed circuit board 140 coupled to the other surface.

The printed circuit board 140 may be equipped with a processor, memory, and/or an interface. The processor may include, for example, one or more of a central processing unit, an application processor, a graphics processing unit, an image signal processor, a sensor hub processor, or a communication processor.

According to an embodiment, the memory may store various data used by at least one component (eg, a processor or a sensor module) of the electronic device. The data includes, for example, software (eg, a program) and It may include input data or output data for a command related thereto.

According to an embodiment, the interface may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, and/or an audio interface. The interface may, for example, electrically or physically connect the electronic device 100 to an external electronic device, and may include a USB connector, an SD card/MMC connector, or an audio connector.

According to an embodiment, the battery 150 includes at least one component of the electronic device 100 (eg, at least one of a display, a processor, an antenna, an audio module, a sensor module, a light emitting device, and a camera module). As a device for supplying electric power, it may include, for example, a non-rechargeable primary cell, or a rechargeable secondary cell, or a fuel cell. At least a portion of the battery 150 may be disposed, for example, on the same plane as the printed circuit board 140 . The battery 150 may be integrally disposed inside the electronic device 100 , or may be disposed detachably from the electronic device 100 .

According to an embodiment, the antenna 170 may be disposed between the rear plate 180 and the battery 150 . The antenna 170 may include, for example, a near field communication (NFC) antenna, a wireless charging antenna, and/or a magnetic secure transmission (MST) antenna. The antenna 170 may, for example, perform short-range communication with an external device or wirelessly transmit/receive power required for charging. For example, the antenna 170 may include a coil for wireless charging. In another embodiment, the antenna structure may be formed by a part of the side bezel structure 131 and/or the first support member 130 or a combination thereof.

2 is a diagram illustrating a battery 150 (eg, the battery 150 of FIG. 1 ) according to various embodiments of the present disclosure.

The battery 150 may have a shape in which a positive electrode assembly 151a, a negative electrode assembly 151b, and a battery cell (or electrode assembly) 151 including an electrolyte are accommodated in a battery case 152 . The battery cell 151 includes a positive electrode substrate formed in a thin plate or film shape, a positive electrode assembly 151a in which a positive electrode active material is applied on a surface of the positive electrode substrate, and a negative electrode substrate formed in a thin plate or film shape. ) and a laminate of a negative electrode assembly 151b and a separator 151c coated with an anode active material on the surface of the negative electrode substrate may be wound or overlapped. Here, the separator 151c may be positioned between the positive electrode assembly 151a and the negative electrode assembly 151b to prevent a short-circuit and to enable the movement of ions.

The shape of the battery 150 may vary. For example, a typical shape of the battery 150 may be a pouch type, a cylindrical shape, a prismatic shape, or a can type. For example, the case 152 of the battery 150 shown in FIG. 2 may correspond to a pouch-type case to accommodate and seal the battery cells 151 , the positive electrode assembly 151a and the negative electrode assembly. The 151b and the separator 151c may be configured in the form of a jelly-roll inside the case 152 . The battery 150 may be released as a variety of products having different specifications. Accordingly, although not shown in the drawings, product information such as storage capacity and handling precautions may be displayed on one surface of the battery 150 .

3 is a diagram illustrating an internal structure of the battery 150 of FIG. 2 according to various embodiments of the present disclosure.

Referring to FIG. 3 , a battery (eg, battery 150 of FIG. 2 ) includes a positive electrode assembly 201 (eg, positive electrode assembly 151a of FIG. 2 ), a negative electrode assembly 203 (eg, negative electrode assembly of FIG. 2 ). (151b)) and the separator 220 (eg, the separator 151c of FIG. 2 ) may be configured to include a battery cell (or electrode assembly) 200 . The battery cell 200 may be configured such that the positive electrode assembly 201 , the negative electrode assembly 203 , and the separator 220 are sequentially wound from a central region of the battery.

The positive electrode assembly 201 may include a positive electrode substrate 210 and a positive electrode active material applied to at least one surface of the positive electrode substrate 210 . According to an embodiment, the positive electrode assembly 201 may include a positive electrode substrate 210 and positive electrode

active materials

211 and 212 respectively coated on one surface and the other surface of the positive electrode substrate 210 .

The anode substrate 210 may be, for example, a metal formed of aluminum (Al), stainless steel (STS), titanium (Ti), copper (Cu), silver (Ag), or a combination of materials selected from these.

The positive

active materials

211 and 212 may include a material capable of reversibly occluding and releasing lithium ions. For example, the positive electrode active material is lithium cobalt oxide, lithium nickel oxide, lithium nickel cobalt oxide, lithium nickel cobalt aluminum oxide, nickel lithium transition metal oxides such as lithium nickel cobalt manganese oxide, lithium manganese oxide or lithium iron phosphate, nickel sulfides, sulfides It may include at least one material selected from the group consisting of copper sulfides, sulfur, iron oxides, and vanadium oxides.

A binder (not shown) or a conductive agent (not shown) may be further applied to the surface of the cathode substrate 210 in addition to the cathode

active materials

211 and 212 . The binder is polyvinylidene fluoride, vinylidene fluoride/hexafluoropropylene copolymer, vinylidene fluoride/tetrafluoroethylene copolymer Polyvinylidene fluoride-containing binders, such as sodium-carboxymethylcellulose, lithium-carboxymethyl cellulose, carboxymethyl cellulose-based binders, such as containing binders), polyacrylic acid, lithium-polyacrylic acid, acrylic, polyacrylonitrile, polymethyl methacrylate or polybutylacrylate ( acrylate-containing binders such as polybutylacrylate), polyimide-imides, polytetrafluoroethylene, polyethylene oxide, polypyrrole, lithium-nafion At least one material selected from the group consisting of (lithium-Nafion) or styrene butadiene rubber-containing polymers may be included. Conductive agents are carbon-containing conducting agents such as carbon black, carbon fiber or graphite, conductive fibers such as metal powder, carbon fluoride Carbon fluoride powder, metal powder such as aluminum powder and nickel powder, conductive whisker such as zinc oxides or potassium titanate, titanium oxide ( and at least one material selected from the group consisting of conductive metal oxides such as titanium oxides or conductive polymers such as polyphenylene derivatives.

The negative electrode assembly 203 may include a negative electrode substrate 230 and an anode active material applied to at least one surface of the negative electrode substrate 230 . According to an embodiment, the negative electrode assembly 203 may include a negative electrode substrate 230 and negative electrode

active materials

231 and 232 respectively coated on one surface and the other surface of the negative electrode substrate 230 .

The negative electrode substrate 230 may include, for example, at least one metal selected from the group consisting of copper, stainless steel (STS), nickel, aluminum, or titanium. .

The negative active materials 231 and 233 may include a material capable of forming an alloy together with lithium or a material capable of reversibly intercalating and deintercalating lithium. For example, the anode active material may include at least one material selected from the group consisting of metals, carbon-containing materials, metal oxides, and lithium metal nitrides. have.

Here, the metals are lithium, silicon, magnesium, calcium, aluminum, germanium, tin, lead, and arsenic. ), antimony, bismuth, silver, gold, zinc, cadmium, mercury, copper, iron, nickel ), cobalt (cobalt) or indium (indium) may include at least one material selected from the group consisting of.

Carbon-based materials include graphite, graphite carbon fiber, coke, mesocarbon microbeads (MCMBS), polyacene, pitch-derived carbon fiber) or at least one material selected from the group consisting of hard carbon.

Metal oxides include lithium titanium oxides, titanium oxides, molybdenum oxides, niobium oxides, iron oxides, tungsten oxides, and tin oxides. oxides), amorphous tin oxide composites, silicon monoxide, cobalt oxides, or nickel oxides may include at least one selected from the group consisting of.

A binder and a conductive agent may be further applied to the surface of the anode base 230 in addition to the anode active materials 231 and 233 . The binder and the conductive agent may be the same as or similar to the binder and the conductive agent applied to the positive electrode substrate 210 .

The separator 220 may be positioned between the positive electrode assembly 201 and the negative electrode assembly 203 . The separator 220 may be formed of, for example, a porous polymer membrane such as polyethylene or polypropylene membrane. The separator 220 may be positioned between the positive electrode assembly 201 and the negative electrode assembly 203 to insulate the positive electrode assembly 201 and the negative electrode assembly 203 from each other.

4 is an enlarged view of an internal structure of a battery according to an embodiment. FIG. 4 may show an enlarged view of part A of the battery shown in FIG. 3 .

Referring to FIG. 4 , when a portion of a battery according to an embodiment is enlarged, the positive electrode substrate 210 and the first and second positive electrode

active materials

211 and 212 coated on at least one surface of the positive electrode substrate 210 are included. A negative electrode assembly including a positive electrode assembly, a separator 220, a negative electrode substrate 230, and first and second negative

active materials

231 and 232 coated on at least one surface of the negative electrode substrate 230 are stacked. can have According to the embodiment shown in FIG. 4 , the positive electrode assembly, the separator 220 , and the negative electrode assembly included in the battery cell (eg, the battery cell 200 of FIG. 3 ) are shown to be spaced apart from each other by a predetermined distance, but in another embodiment According to , a battery cell (eg, the battery cell 200 of FIG. 3 ) including a positive electrode assembly, a separator 220 , and a negative electrode assembly is insulated from the positive electrode assembly and the negative electrode assembly by the separator 220 , so each component A configuration in which the elements are stacked substantially face-to-face is also possible.

Referring to FIGS. 3 and 4 together, the battery cell 200 according to an embodiment is a first, which is applied to at least one surface of the positive electrode substrate 210 and the positive electrode substrate 210 with respect to the separator 220 , The second positive

active materials

211 and 211 may be disposed on the outside, and the first and second negative

active materials

231 and 232 coated on at least one surface of the negative electrode substrate 230 and the negative electrode substrate 220 may be disposed on the inside. have. Although not shown in the drawings, the battery cell 200 according to another embodiment includes the first and second positive electrodes coated on at least one surface of the positive electrode substrate 210 and the positive electrode substrate 210 with respect to the separator 220 . The

active materials

211 and 212 may be disposed on the inside, and the first and second anode

active materials

231 and 232 coated on at least one surface of the negative electrode substrate 230 and the negative electrode substrate 220 may be disposed on the outside. Hereinafter, it will be mainly described with respect to the embodiment with respect to FIGS. 3 and 4 .

5 is a conceptual diagram illustrating a state in which a nail is nailed into the battery of FIG. 4 and is damaged. FIG. 5 may show a state in which a battery cell is damaged by a nail during a nail process, which is one of the safety tests of the battery.

When the battery receives an external shock or is charged abnormally, a short circuit may occur in at least some areas, and an unintentional large current may flow through the electrode layer when a short circuit occurs.

According to an embodiment, as shown in FIG. 5 , a nail 300 is nailed to at least a portion of a battery cell, and deformation such as torn or stamped of the battery cell may occur. For example, when the nail 300 presses or pierces the battery cell, a portion of the electrode and/or the substrate may be drawn into the battery cell along the direction in which the nail 300 is pressed. Accordingly, the positive electrode assembly, the negative electrode assembly, or the separator 220 may be contracted or deformed. In addition, at least a portion of the components of the positive electrode assembly and at least a portion of the components of the negative electrode assembly may be short-circuited with each other.

For example, the positive electrode substrate 210 of the positive electrode assembly and the first negative active material 231 of the negative electrode assembly may contact each other. In this case, the battery may ignite or explode due to the rapid increase in current. As another example, the positive electrode active material 211 of the positive electrode assembly and the negative electrode substrate 230 of the negative electrode assembly may contact each other. A rapid increase in current may cause the battery to ignite or explode.

According to various embodiments of the present disclosure to be described below, as shown in FIG. 5 , at least a portion of a component of a positive electrode assembly of a battery and at least a portion of a component of a negative electrode assembly of a battery are short-circuited with each other in certain circumstances as shown in FIG. 5 . circuit), it is possible to provide a battery structure that prevents safety accidents such as ignition or explosion due to a rapid increase in current.

6 is an enlarged view of an internal structure of a battery according to various embodiments of the present disclosure; 7 is a conceptual diagram illustrating a state in which a nail is nailed into the battery of FIG. 6 and is damaged. 8 is a graph illustrating a heat generation level of a battery according to a short-circuit resistance when the battery is internally short-circuited, according to an embodiment.

6 and 7 , at least a portion of the surface of the positive electrode substrate 210 may be modified (eg, oxidized) to form an oxide coating layer 210 ′.

3 and 5 , the battery cell according to the embodiment shown in FIGS. 6 and 7 (eg, the battery cell 200 of FIG. 3 ) includes a positive electrode substrate 210 and a positive electrode substrate 210 . ), the first and second negative electrodes coated on at least one surface of the positive electrode assembly, the separator 220 and the negative electrode substrate 220 and the negative electrode substrate 220 composed of the first and second positive

active materials

211 and 212 coated on at least one surface of the The negative electrode assembly may include

active materials

231 and 232 .

According to an embodiment, the positive electrode active material may have a second direction opposite to the first direction of the first positive active material 211 and the positive electrode substrate 210 applied to one surface of the positive electrode substrate 210 facing the first direction. It may include a second positive electrode active material 212 applied to the other surface facing.

Similarly, the first negative active material 231 applied to one surface of the negative electrode substrate 230 facing the first direction and the other surface facing the second direction opposite to the first direction of the negative electrode substrate 230 are also applied to the negative electrode active material. It may include a second negative active material 232 applied to the.

According to an embodiment, here, the anode base 210 may be made of aluminum, and in contrast to this, the cathode base 230 may be made of copper.

In addition, the battery cell according to the embodiment shown in FIGS. 6 and 7 (eg, the battery cell 200 of FIG. 3 ) is subjected to oxidation treatment by an anodizing method on the surface of the positive electrode substrate 210 to the positive electrode substrate 210 . ) can be modified on the surface.

The oxide film layer 210 ′ may be formed through the surface modification of the anode substrate 210 . The positive electrode assembly further comprising an oxide film layer 210 ′ in addition to the positive electrode substrate 210 and the first and second positive electrode

active materials

211 and 212 applied to at least one surface of the positive electrode substrate 210 is damaged by a nail to prevent a short circuit. Even in the case of occurrence (hereinafter referred to as 'internal short circuit of the battery'), excessive flow of current in the short-circuited portion may be suppressed, and consequently, the temperature rise of the short-circuited portion may be suppressed. 5 and 7 , in the case of the battery cell illustrated in FIG. 7 , the amount of heat generated in the short-circuited portion may be reduced compared to the short-circuited portion of the battery cell illustrated in FIG. 5 .

The embodiment illustrated in FIG. 8 may indicate a heat generation level when batteries of three different conditions having a specific capacity (eg, 4Ah) are short-circuited. The horizontal axis of FIG. 8 may represent short resistance, and the vertical axis of FIG. 8 may represent heat.

In the graph of FIG. 8 , Al-Negative is, for example, between a positive electrode substrate made of aluminum (eg, the positive electrode substrate 210 of FIG. 7 ) and a negative electrode active material (eg, the first negative electrode active material 231 of FIG. 7 ). It can exhibit a calorific value upon contact, and Al/AlxOy-Negative and Al/AlxOy'-Negative are made of aluminum, and surface oxidation-treated positive electrode substrate (eg, positive electrode substrate 210 in FIG. 7) and negative electrode active material (eg: The amount of heat generated upon contact between the first negative active material 231 of FIG. 7 ) may be indicated, and the positive-negative is the positive-negative positive active material (eg, the first positive active material 211 of FIG. 7 ) and the negative electrode active material (eg, the second negative active material of FIG. 7 ). 1 may indicate the amount of heat generated when the anode active materials 231) are in contact with each other. Here, the battery corresponding to one of the three conditions may mean a general battery with a non-modified surface having a total resistance of a battery cell (eg, electrical resistance + electrolyte resistance + contact resistance) of 10 mOhm. A battery corresponding to the other one of the three conditions may refer to a battery in which the surface of the positive electrode substrate (eg, the positive electrode substrate 210 of FIG. 7 ) is modified so that the total resistance of the battery cell has a resistance of 20 mOhm level. have. A battery corresponding to the other one of the three conditions may mean a battery in which the surface of the positive electrode substrate (eg, the positive electrode substrate 210 of FIG. 7 ) is modified so that the total resistance of the battery cell has a resistance of 30 mOhm level. have. Here, a battery including a surface-modified positive electrode substrate (eg, the positive electrode substrate 210 of FIG. 7 ) having two of the three conditions may employ a soft anodizing method as a surface modification method thereof. Unlike the general anodizing method, the soft anodizing method may be a method of growing an oxide film layer very thinly at a slow rate (0.1 to 20 μm per hour) by controlling a specific applied voltage and an electrolyte concentration, etc. Generally, it has a voltage range within 1 V to 500 V, and the electrolyte is usually sulfuric acid (H ₂ SO ₄ ) or oxalic acid (C ₂ H ₂ O ₄ ), selenic acid ( selenic acid, H ₂ SeO ₄ ), phosphoric acid (phosphoric acid, H ₃ PO ₄ ), and the like may be used. As shown in FIG. 8 , as the total resistance of a battery cell increases (a battery with a large resistance), the amount of heat generated in most of the short-circuit resistance range is significantly reduced. In the embodiment of FIG. 8 , a thick line, a dotted line, and a solid line change how the behavior of the calorific value in the surface-modified battery changes compared to the general battery. In the case of a short circuit in a general battery, heat of 400 W or more (thick line) occurred, but in the case of a battery with surface modification, the heat output is reduced to 200 W or less (dotted line and solid line), so the risk of ignition is reduced to less than half. do.

Meanwhile, referring to FIG. 8 , the amount of heat generated when the positive electrode substrate (eg, the positive electrode substrate 210 of FIG. 7 ) and the negative electrode active material (eg, the first negative active material 231 ) (Al-Negative) comes into contact is, the positive electrode active material It can be seen that (eg, the first positive active material 211 ) and the negative electrode active material (eg, the first negative active material 231 ) are significantly larger than the amount of heat generated when in positive-negative contact. That is, when the battery is short-circuited, the amount of heat generated by the contact between the components included in the same battery cell 200 may be different. Hereinafter, the calorific value of the battery according to the short-circuited aspect will be described in detail with reference to FIGS. 9A and 9B .

9A is a diagram illustrating an amount of power generated by a battery for each short-circuited aspect when the battery is internally short-circuited, according to an embodiment. 9B is a diagram illustrating a temperature of a battery for each short-circuited aspect when the battery is internally short-circuited, according to an embodiment.

As an internal short circuit of the battery, for example, as shown in FIGS. 5 and 7 , a situation in which the entire battery cell including the positive electrode assembly, the separator 220 and the negative electrode assembly is torn or stamped by a nail may occur.

Regarding the aspect of the internal short circuit of the battery, in the embodiment shown in FIGS. 9A and 9B , Al-anode may represent a short circuit between the positive electrode substrate 210 made of aluminum and the negative electrode active material 231 , and Al-Cu may indicate a short circuit between the positive electrode substrate 210 made of aluminum and the negative electrode substrate 230 made of copper. In addition, the anode-cathode may indicate a short circuit between the negative electrode active material 231 and the positive electrode active material 211 , and the Cu-cathode may indicate a short circuit between the negative electrode substrate 230 made of copper and the positive electrode active material 211 .

9A and 9B together, the short circuit between the positive electrode substrate 210 made of aluminum and the negative electrode active material 231 (short circuit between Al-anode) is the most dangerous because the exothermic rate and temperature increase rate per hour are the highest, and the next A short circuit between the positive electrode substrate 210 made of aluminum and the negative electrode substrate 230 made of copper (a short circuit between Al-Cu) may be dangerous. Then, a short circuit between the anode active material 231 and the cathode active material 211 (short circuit between anode-cathode), a short circuit between the anode substrate 230 made of copper and the cathode active material 211 (short circuit between Cu-cathodes), in the order of power per hour The amount of production and the rate of temperature rise are reduced. For example, the low degree of heat generation in the short circuit between the anode active material 231 and the cathode active material 211 (short circuit between the anode and cathode) may be due to the fact that the current does not flow much because the resistance of the cathode layer is large.

When an oxide film layer or a resistance layer is formed on the positive electrode substrate 210 according to various embodiments of the present disclosure, although not separately described in the drawings, the positive electrode substrate 210 and the negative electrode active material 231 made of aluminum in FIGS. 9A and 9B . ) of the hourly power generation amount and temperature rise rate curve (the hourly power generation amount and temperature rise rate curve of Al-anode) is a curve direction (anode-cathode) In the case of a short circuit, it may change in the direction of the amount of power generated per hour and the temperature increase rate curve). That is, the amount of heat generated by the positive electrode substrate 210 and the negative electrode active material 231 made of aluminum is reduced.

In various embodiments of the present disclosure, in various embodiments of the present disclosure, the nail 300 penetrates from the outside of the battery cell, A method for improving stability in a situation in which at least a part of the body is contracted and deformed will be described.

According to various embodiments of the present disclosure, the surface electrical resistance of the positive electrode substrate 210 may be increased by modifying the surface of the positive electrode substrate 210 instead of the surface of the negative electrode substrate 230 . Accordingly, referring back to the embodiment shown in FIGS. 6 and 7 , as the battery cell is torn or stamped by the nail 300 , a short circuit between Al-anodes, a short circuit between anode-cathodes, a short circuit between Al-Cu, Cu- Multiple short-circuits may occur, such as a short circuit between the cathodes. In this situation, according to various embodiments of the present disclosure, the surface electrical resistance of the positive electrode substrate 210 may be increased by modifying the surface of the positive electrode substrate 210 instead of the surface of the negative electrode substrate 230 . 8 to 9B, in a multi-short-circuit situation, it may be effective to prevent ignition in the short circuit between Al-anode, which is the most dangerous. According to an embodiment of the present disclosure, a positive electrode assembly including a positive electrode substrate 210 and positive electrode

active materials

211 and 212; a negative electrode assembly including a negative electrode substrate 230 and negative

active materials

231 and 232; and the separator 220 may be used to form a battery cell. In this case, the positive electrode assembly may be disposed to be positioned outside the battery cell with respect to the separator 220 . According to an embodiment, the positive electrode substrate 210 and the positive electrode

active materials

211 and 212 may be formed to have greater resistance than the negative electrode substrate 230 and the negative electrode

active materials

231 and 232 due to a difference in materials. Considering this point, in the case where the electrode and the substrate are drawn in together with the nail 300 as the battery cell is torn or stamped by the nail 300 , the positive electrode substrate 210 is used rather than the negative electrode substrate 230 of the laminated structure. By disposing on the outer side, it is possible to allow a component having a relatively greater resistance to be drawn in together with the nail 300 . Accordingly, even if a short-circuit occurs inside the battery cell, it is possible to reduce the risk of ignition.

According to various embodiments, the oxide film layer 210 ′ may be formed between the positive electrode substrate 210 and the first positive electrode active material 211 , but, in contrast, between the positive electrode substrate 210 and the second positive electrode active material 212 . may be formed in Also, the oxide layer 210 ′ may be formed between the positive electrode substrate 210 and the first positive electrode active material 211 and between the positive electrode substrate 210 and the second positive electrode active material 212 . According to an embodiment, it may be most effective to modify the surface between the positive electrode substrate 210 and the first positive electrode active material 211 among the surfaces of the positive electrode substrate 210 . For example, the surface-modified first positive active material 211 is disposed on the outer side of the battery cell compared to the second positive active material 212 , so that a portion having a greater resistance is drawn in together with the nail 300 . By doing so, even if a short-circuit occurs, it is possible to reduce the risk of ignition. In summary, by forming the oxide film layer 210 ′ on the surface between the positive electrode substrate 210 and the first positive electrode active material 211 , even if a nail penetrates from the outside of the battery cell, the stability during a short circuit inside the battery is greatly improved. can be improved

10 is a diagram illustrating an oxide film layer 210 ′ according to various embodiments of the present disclosure.

The specific shape of the oxide film layer 210 ′ may vary according to embodiments. According to various embodiments, the oxide film layer 210 ′ may form a mesh pattern as shown in FIG. 10A , and a porous groove pattern as shown in FIG. 10B . may be formed, and an atypical block pattern may be formed as shown in FIG. 10(c), or a stripe or oblique pattern may be formed as shown in FIG.

According to various embodiments, the oxide film layer 210 ′ may be formed of a porous layer including a plurality of recesses 211 ′. The plurality of recesses 211 ′ are all small holes formed on the surface of the material, such as openings, grooves, holes, slits, slots, and openings. It can mean form. The shape, density, and number of the plurality of recesses 211 ′ may be adjusted according to various parameters such as time, temperature, and voltage of the surface modification. According to various embodiments, the oxide film layer 210 ′ may be formed of a porous layer including the plurality of recesses 211 ′, and an oxide film and/or an anode formed on the plurality of recesses 211 ′. The active material may permeate. In this way, the oxide film layer 210 ′ may be sealed (or sealed) in a state in which the oxide film and/or the positive electrode active material are permeated into the plurality of recesses 211 ′.

According to various embodiments of the present disclosure, the electrical resistance of the surface of the positive electrode substrate may be increased through surface modification. However, it is necessary to prevent a decrease in current flow due to an excessive increase in resistance. In order to increase resistance, but to prevent excessive reduction in current flow, a positive active material may be disposed in a plurality of recesses of the porous layer (oxide layer 210 ′).

According to an embodiment, the positive electrode applied to the positive electrode substrate 210 as the positive electrode active material is placed in the plurality of recesses 211 ′ of the oxide film layer 210 ′ formed through surface modification of the positive electrode substrate 210 . The amount of the active material (eg, the first positive active material 211 ) may be greater than the amount of the negative active material (eg, the first negative active material 231 ) applied to the negative electrode substrate 220 .

According to an embodiment, the resistance of the surface-treated (eg, modified) positive electrode substrate 210 may be formed to be 1% to 15% of the total resistance of the positive electrode assembly, preferably around 5%. Due to the surface modification of the positive electrode substrate 210, a rapid increase in current during an internal short circuit of the battery is prevented, but by controlling the amount of the positive electrode active material applied to the positive electrode substrate 210, the overall resistance of the positive electrode assembly is excessively increased to flow current can be done so as not to interfere with According to one embodiment, the resistance of the surface-treated positive electrode substrate 210 is a factor such as an interval of a pattern formed in the oxide film layer 210 ′, a density, and an amount of the positive electrode active material placed in the plurality of recesses 211 ′. can be adjusted by For example, the spacing and density of the patterns formed on the pattern layer 210 ′ may be adjusted during an anodizing process, which will be described later.

11 is a block diagram illustrating a method for treating a surface of a cathode substrate according to various embodiments of the present disclosure. 12 is a conceptual diagram illustrating a surface treatment process of a cathode substrate according to various embodiments of the present disclosure. A method of surface treatment of a cathode substrate including an anodizing method according to an embodiment of the present disclosure will be described with reference to FIGS. 11 and 12 .

According to various embodiments of the present disclosure, the method for treating the surface of a positive electrode substrate may include the following operations 1101 to 1105, and a plurality of these operations are performed on the surface modification line 410 provided as shown in FIG. 12 . This may be continuously performed with respect to the positive electrode substrate 210 put into the .

First, in relation to the 'material input' step of operation 1101, a design is performed to make a battery with what appearance and shape and with what specifications. After deciding which material to use for the positive electrode substrate, whether to surface-treat the entire part of the positive electrode substrate, or whether to surface-treat a part of the positive electrode substrate, select the part to be surface treated through anodizing on the positive electrode substrate. can For example, a positive electrode substrate made of aluminum or an aluminum alloy may be used, and the surface modification may be performed on only a portion of the surface of the positive electrode substrate. Next, in relation to operation 1102 'pretreatment', the pretreatment (cleaning) may include a degreasing process, a chemical polishing process, and a de-smut process. In this case, the degreasing process may be selectively applicable such as acidic or neutral degreasing solution depending on the process environment and target material. The chemical polishing process may be performed to planarize the surface irregularities 401 of the non-uniformly treated material and to improve the surface gloss. The desmut process may be performed to remove smut and foreign substances from the surface of the material generated from the degreasing process and the chemical polishing process.

Next, the surface of the positive electrode substrate 210 may be modified by an anodizing 1103 method. In operation 1103 , in relation to 'anodizing', in the anodizing step, an anodized film may be formed on the anode substrate 210 . According to one embodiment, the method for forming an anodized film is sulfuric acid, oxalic acid, phosphoric acid, chromic acid, selenic acid, or organic acid (citric acid, acetic acid, propionic acid). , tartaric acid) or an electrolyte containing at least one or both of an electrolyte containing boric acid is provided, and after immersing (1103-1) (or immersing) the anode substrate 210 in the electrolyte, a predetermined voltage and You can proceed by providing the temperature. The formation of the anodized film is performed by applying a current (1103-2) (or applying a voltage) to the anode substrate 210 using the cathode 420 to cause a reaction with oxygen, and forming a dense oxide film (1103-3). )can do. For example, the operating voltage is applicable within the range of about 1 to 500V, and the process time may take about 10 minutes to 3 hours. The process temperature may be all applicable within the range of approximately 5 to 30 °C. According to an embodiment, the present disclosure is an anodizing method, and as described above, a soft anodizing method may be used. The oxide film layer can be grown very thinly at a slow rate (0.1 to 20 μm per hour) through the soft anodizing method of controlling a specific applied voltage and electrolyte concentration.

According to an embodiment, a post-treatment step may be further performed after the oxide film is formed. In the post-processing step, film sealing processing and sealing post processing may be performed. The sealing treatment may include both a treatment method including a metal salt and a treatment method with a non-metal salt made of an organic material. This may include hydration sealing treatment using water and steam. Post-sealing treatment may include an elution process for removing metal salts or a hot water washing process for cleaning foreign substances. These post-treatment steps may be performed in order to secure the stability and reliability of the anodized cathode substrate.

According to one embodiment, the process of processing the raw material of the cathode substrate in the pre-treatment step or the post-treatment step may be further included. The machining process may include a cutting process and a joining process. Through the cutting process, the anode substrate can be manufactured in a desired size and shape. A process of attaching a positive electrode tab (not shown), which is a component of a battery cell, to the positive electrode substrate may be performed through the bonding process. The processing process may refer to any chemical or physical processing process capable of forming the cathode substrate of the present disclosure.

Next, in relation to the 'rinsing' step of operation 1104, by-products (eg, residual liquid 402, cutting oil, machining burrs, and other foreign materials) generated in the anodizing process or post-treatment step may be removed. Thereafter, in relation to the 'drying' step of operation 1105 , the positive electrode substrate 210 that has undergone the washing step is dried to form an oxide film (eg, Al ₂ O ₃ ) on the surface of the positive electrode substrate 210 . For example, when the surface of the positive electrode substrate 210 made of aluminum or an aluminum alloy is treated by an anodizing process, an oxide film of Al ₂ O ₃ may be formed on the surface of the positive electrode substrate 210 .

Meanwhile, as a method for modifying the surface of the cathode substrate 210 according to various embodiments of the present disclosure, a surface modification method other than the above-described anodizing may be applied. For example, chromate conversion coating or corona treatment may be applied as a method for modifying the surface of the anode substrate 210 . According to various embodiments, the surface resistance of the positive electrode substrate 210 may be increased through the chromate conversion coating or corona treatment, thereby suppressing an excessive flow of current during an internal short circuit of the battery cell and suppressing a temperature increase of the short circuit portion. .

The battery according to various embodiments of the present disclosure may have an advantage in that the heat generation temperature does not rapidly increase when the battery is damaged and a short-circuit is formed by including the surface-treated positive electrode substrate. In addition, by including the surface-treated cathode substrate, even if the battery is damaged and a short-circuit is formed, it may have an advantage that a safety function can be operated. In addition, by including the surface-treated cathode substrate, even if the battery is damaged and a short-circuit is formed, it may have an advantage in that the energy of the battery is safely consumed without ignition. In addition, the battery may include an oxide film (pattern layer) formed by a surface modification method such as anodizing, and thus it does not occupy a volume and the output performance can be satisfied without lowering the capacity or energy density of the battery, as well as safety. may have the advantage of being improved.

The electronic device according to various embodiments disclosed in this document may have various types of devices. The electronic device may include, for example, a portable communication device (eg, a smart phone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, or a home appliance device. The electronic device according to the embodiment of the present document is not limited to the above-described devices.

The various embodiments of this document and terms used therein are not intended to limit the technical features described in this document to specific embodiments, but it should be understood to include various modifications, equivalents, or substitutions of the embodiments. In connection with the description of the drawings, like reference numerals may be used for similar or related components. The singular form of the noun corresponding to the item may include one or more of the item, unless the relevant context clearly dictates otherwise. As used herein, "A or B", "at least one of A and B", "at least one of A or B", "A, B or C", "at least one of A, B and C", and "A , B, or C" each may include any one of the items listed together in the corresponding one of the phrases, or all possible combinations thereof. Terms such as "first", "second", or "first" or "second" may be used simply to distinguish the element from other elements in question, and may refer to elements in other aspects (e.g., importance or order) is not limited. It is said that one (eg, first) component is "coupled" or "connected" to another (eg, second) component, with or without the terms "functionally" or "communicatively". When referenced, it means that one component can be connected to the other component directly (eg by wire), wirelessly, or through a third component.

The term “module” used in various embodiments of this document may include a unit implemented in hardware, software, or firmware, and is interchangeable with terms such as, for example, logic, logic block, component, or circuit. can be used as A module may be an integrally formed part or a minimum unit or a part of the part that performs one or more functions. For example, according to an embodiment, the module may be implemented in the form of an application-specific integrated circuit (ASIC).

According to various embodiments, each component (eg, module or program) of the above-described components may include a singular or a plurality of entities, and some of the plurality of entities may be separately disposed in other components. have. According to various embodiments, one or more components or operations among the above-described corresponding components may be omitted, or one or more other components or operations may be added. Alternatively or additionally, a plurality of components (eg, a module or a program) may be integrated into one component. In this case, the integrated component may perform one or more functions of each component of the plurality of components identically or similarly to those performed by the corresponding component among the plurality of components prior to the integration. . According to various embodiments, operations performed by a module, program, or other component are executed sequentially, in parallel, repeatedly, or heuristically, or one or more of the operations are executed in a different order, or omitted. or one or more other operations may be added.

According to various embodiments of the present disclosure, a positive electrode substrate (eg, the positive electrode substrate 210 of FIG. 6 ); a positive active material (eg, the positive

active material

211 or 212 of FIG. 6 ) applied to at least one surface of the positive electrode substrate; an anode substrate (eg, the anode substrate 230 of FIG. 6 ); an anode active material (eg, the anode

active materials

231 and 232 of FIG. 6 ) applied to at least one surface of the anode substrate; a separator (eg, the separator 220 of FIG. 6 ) positioned between the positive electrode substrate and the negative electrode substrate; And, it is possible to provide a battery (eg, the battery 150 of FIG. 1 ) including an oxide film layer (eg, the oxide film layer 210 ′ of FIG. 6 ) formed through surface modification on at least one surface of the positive electrode substrate.

In addition, according to various embodiments of the present disclosure, a front plate (eg, the front plate 110 of FIG. 1 ), a rear plate facing the opposite direction of the front plate (eg, the rear plate 180 of FIG. 1 ), and a housing (eg, the housing 101 of FIG. 1 ) including a side bezel structure (eg, the side bezel structure 131 of FIG. 1 ) surrounding the space between the front plate and the rear plate; and a battery (eg, the battery 150 of FIG. 1 ) in the housing.

According to various embodiments, the positive active material may include a first positive active material (eg, the first positive active material 211 of FIG. 7 ) applied to one surface of the positive electrode substrate facing in the first direction, and the first positive active material of the positive electrode substrate. A second positive active material (eg, the second positive active material 212 of FIG. 7 ) applied to the other surface facing the second direction opposite to the first direction may be included.

According to various embodiments, the oxide layer may be formed between the first positive active material and the positive electrode substrate.

According to various embodiments, the negative active material may include a first negative active material (eg, the first negative active material 231 of FIG. 7 ) applied to one surface of the negative electrode substrate facing in the first direction and the first negative active material of the negative electrode substrate. It may include a second negative active material (eg, the second negative active material 232 of FIG. 7 ) applied to the other surface facing the second direction opposite to the first direction.

According to various embodiments, the cathode substrate may be formed of aluminum.

According to various embodiments, the negative electrode substrate may be formed of copper.

According to various embodiments, a positive electrode assembly including the positive electrode substrate and the positive electrode active material; a negative electrode assembly including the negative electrode substrate and the negative electrode active material; and the separator forms a battery cell (eg, the battery cell 200 of FIG. 3 ), and the positive electrode assembly is disposed outside the battery cell with respect to the separator.

According to various embodiments, the oxide layer may be formed of a porous layer including a plurality of recesses (eg, a plurality of recesses 211 ′ in FIG. 10 ).

According to various embodiments, the positive active material may be disposed in the plurality of recesses.

According to various embodiments, the amount of the positive electrode active material applied to the positive electrode substrate may be greater than the amount of the negative electrode active material applied to the negative electrode substrate.

According to various embodiments, the oxide film layer may increase the resistance of the positive electrode substrate when a battery is short-circuited.

According to various embodiments, the oxide film layer may form a resistance of 1% to 15% of the total resistance of the positive electrode assembly including the positive electrode substrate.

According to various embodiments, the oxide layer may be formed by oxidizing the surface of the cathode substrate by an anodizing method.

According to various embodiments of the present disclosure, a cathode substrate; a first positive active material applied to one surface of the positive electrode substrate; and a second positive electrode active material applied to the other surface of the positive electrode substrate; negative electrode substrate; a first negative active material applied to at least one surface of the negative electrode substrate; and a second negative electrode active material applied to the other surface of the negative electrode substrate; a separator positioned between the positive electrode assembly and the negative electrode assembly; and an oxide film layer formed between the positive electrode substrate and the first positive electrode active material and formed through surface modification of the positive electrode substrate, and an electronic device including the same.

According to various embodiments of the present disclosure, a cathode substrate; a first positive active material applied to one surface of the positive electrode substrate; and a second positive electrode active material applied to the other surface of the positive electrode substrate; negative electrode substrate; a first negative active material applied to at least one surface of the negative electrode substrate; and a second negative electrode active material applied to the other surface of the negative electrode substrate; a negative electrode assembly comprising a; and a separator positioned between the positive electrode assembly and the negative electrode assembly; the surface of the positive electrode substrate through surface modification of the positive electrode substrate It is possible to provide a battery and an electronic device including the same by increasing the resistance, but the resistance of the surface-modified positive electrode substrate being 1% to 15% of the total resistance of the positive electrode assembly.

According to various embodiments, the surface modification method may be selected from any one of anodizing, chromate conversion coating, and corona treatment.

The battery pack of the various embodiments disclosed in this document described above and the electronic device including the same are not limited by the above-described embodiments and drawings, and various substitutions, modifications, and changes are possible within the technical scope disclosed in this document. It will be apparent to those of ordinary skill in the art to which the present invention pertains.

Claims

In an electronic device,

a housing including a front plate, a rear plate facing in a direction opposite to the front plate, and a side bezel structure surrounding a space between the front plate and the rear plate; and

a battery disposed in the space within the housing; including, the battery comprising:

anode substrate;

a positive active material applied to at least one surface of the positive electrode substrate;

negative electrode substrate;

a negative active material applied to at least one surface of the negative electrode substrate;

a separator positioned between the positive electrode substrate and the negative electrode substrate; and,

and an oxide film layer formed on at least one surface of the anode substrate through surface modification.
The method of claim 1,

The positive active material is

An electronic device comprising: a first positive active material applied to one surface of the positive electrode substrate facing a first direction; and a second positive active material applied to the other surface of the positive electrode substrate facing a second direction opposite to the first direction.
The method of claim 1,

The oxide film layer is formed between the first positive electrode active material and the positive electrode substrate.
The method of claim 1,

The negative active material is

An electronic device comprising: a first negative active material applied to one surface of the negative electrode substrate facing a first direction; and a second negative active material applied to the other surface of the negative electrode substrate facing a second direction opposite to the first direction.
The method of claim 1,

The anode substrate is an electronic device formed by including an aluminum material.
The method of claim 1,

The negative electrode substrate is an electronic device formed by including a copper material.
The method of claim 1,

a positive electrode assembly including the positive electrode substrate and the positive electrode active material;

a negative electrode assembly including the negative electrode substrate and the negative electrode active material; and

The separator forms a battery cell,

An electronic device in which the positive electrode assembly is disposed on the outside of the battery cell with respect to the separator.
The method of claim 1,

The oxide film layer is an electronic device formed of a porous layer including a plurality of recesses.
9. The method of claim 8,

An electronic device in which the positive active material is disposed in the plurality of recesses.
10. The method of claim 9,

The amount of the positive active material applied to the positive electrode substrate is greater than the amount of the negative active material applied to the negative electrode substrate.
The method of claim 1,

The oxide film layer increases the resistance of the positive electrode substrate when a battery is short-circuited.
12. The method of claim 11,

The oxide film layer forms a resistance of 1% to 15% of the total resistance of the positive electrode assembly including the positive electrode substrate.
The method of claim 1,

The oxide film layer is an electronic device that is formed by oxidizing the surface of the anode substrate by an anodizing method.
The method of claim 1,

An electronic device to increase the surface resistance of the positive electrode substrate through surface modification of the positive electrode substrate, wherein the resistance of the surface-modified positive electrode substrate is 1% to 15% of the total resistance of the positive electrode assembly.
15. The method of claim 14,

The surface modification is

An electronic device implemented by selecting one of anodizing, chromate conversion coating, and corona treatment processes.