KR20210114255A - Battery and electronic device having the same - Google Patents

Abstract

According to the present disclosure, an embodiment of the present invention discloses a battery, which includes a pouch; and an electrode assembly in which a negative electrode plate in which at least a portion of the negative electrode mixture containing the negative electrode active material is coated, a positive electrode plate in which at least a portion of the positive electrode mixture containing the positive electrode active material is coated, and at least one separator disposed between the negative electrode plate and the positive electrode plate are wound and accommodated in the pouch, wherein the positive electrode plate does not include an insulating adhesive member. Various other embodiments inferred from the present specification are also possible. Therefore, it is possible to increase battery capacity by compensating for a loading level of a slurry including the positive electrode active material by the thickness of an insulating tape.

Description

BATTERY AND ELECTRONIC DEVICE HAVING THE SAME

Various embodiments according to the present disclosure relate to a battery of an electronic device, and to a battery and an electronic device including the same.

Lithium-ion batteries, which account for most of the secondary battery market, are lighter in weight and have higher energy density than other batteries. Electric vehicles such as (plug-in hybrid electric vehicle) and ESS (energy storage system) are variously applied.

The manufacturing process of a lithium ion battery may be divided into three steps: an electrode plate process, an assembly process, and a chemical conversion process. The first step, the electrode plate process, is a mixing step of mixing a positive or negative electrode active material, a conductive agent and a binder to create a slurry, a coating step of applying the slurry on a substrate, a compression step, a positive electrode plate coated with the slurry It includes a laminating (laminating) step of attaching an insulating tape to the slitting step (slitting) cut to fit the size of the battery.

The second step of the assembly process includes a winding step of winding the positive and negative plates produced through the electrode plate process together with a separator and an electrolyte injection step. The final step, the chemical conversion process, includes an aging step of activating the battery by storing it at a specific temperature and humidity for a certain period of time.

Meanwhile, in recent years, in order to provide an improved battery capacity for an electronic device of the same size, research on high efficiency of a battery is continued.

An electrode plate process including a coating step in the manufacturing process of a lithium ion battery may be a process that greatly affects the capacity of the battery. The capacity of the battery is determined according to the loading level of the slurry including the negative electrode or the positive electrode active material, and the loading level may mean the amount of coating of the slurry per unit area.

The coating step corresponds to a step of applying the slurry to a constant thickness on the substrate. As the coating step progresses, a non-uniform finish may be formed on the edge of the coating layer. The tip where coating starts may cause the slurry to rise, and the tip where the coating ends may cause dragging of the slurry.

In the case of the positive plate, a short circuit may occur when in contact with the negative plate due to the non-uniform finish of the coating layer. Insulation tape may be attached to the front end and the end of the coating layer of the positive electrode plate to prevent short circuit. However, since the thickness of the insulating tape attached to the positive electrode plate is reflected in determining the loading level of the slurry, the battery capacity may decrease corresponding to the thickness of the insulating tape.

Accordingly, various embodiments according to the present disclosure provide a battery having an increased battery capacity by not attaching an insulating tape to the positive electrode plate.

The battery in one embodiment includes a pouch, and a negative electrode plate in which a negative electrode mixture including a negative electrode active material is coated on at least a part, a positive electrode plate in which a positive electrode mixture including a positive electrode active material is coated on at least a part, and disposed between the negative electrode plate and the positive electrode plate At least one separator may be wound and may include an electrode assembly accommodated in the pouch, and the positive electrode plate may not include an insulating adhesive member.

The battery module in an embodiment includes at least one battery, wherein the at least one battery is a pouch, and at least a portion of a negative electrode plate in which a negative electrode mixture including a negative electrode active material is coated, and a positive electrode mixture containing a positive electrode active material is at least a part and an electrode assembly in which at least one separator disposed between the positive electrode plate and the negative electrode plate and the positive electrode plate is wound and accommodated in the pouch, and both ends of the coating layer coated with the positive electrode mixture may be formed to have smooth sides. .

In the electronic device according to an embodiment, a front plate forming a front surface of the electronic device, a rear plate forming a rear surface of the electronic device, and a bracket surrounding the front plate and the rear plate and forming a side surface of the electronic device , and a battery disposed on at least one surface of the bracket, wherein the battery is a pouch, and a negative electrode plate in which a negative electrode mixture including a negative electrode active material is coated at least in part, a positive electrode plate in which a positive electrode mixture including a positive electrode active material is coated on at least part and an electrode assembly in which at least one separator disposed between the negative electrode plate and the positive electrode plate is wound and accommodated in the pouch, wherein the positive electrode plate may not include an insulating adhesive member.

According to various embodiments of the present disclosure, the battery capacity may be increased by compensating for the loading level of the slurry including the positive electrode active material by the thickness of the insulating tape through the battery to which the insulating tape is not attached.

1 is a block diagram of an electronic device in a network environment according to various embodiments of the present disclosure;
2 is a block diagram of a power management module and a battery according to various embodiments of the present disclosure;
3 is an exploded perspective view of an electronic device including a battery according to an exemplary embodiment;
FIG. 4A schematically illustrates a structure of a battery included in the electronic device of FIG. 3 .
4B schematically illustrates a structure of a battery module including a plurality of batteries.
5A illustrates a structure of a positive electrode plate included in an electrode assembly of a battery according to an exemplary embodiment.
FIG. 5B shows a partial area of a cross-sectional view of the battery of FIG. 4 taken in the direction AA′.
6 is a flowchart illustrating a manufacturing process of a positive electrode plate of a battery according to an exemplary embodiment.
7 shows a state of the positive electrode plate according to the manufacturing process of FIG.
FIG. 8 shows a side view of a positive electrode plate according to the manufacturing process of FIG. 6 .

1 is a block diagram of an electronic device in a network environment according to various embodiments of the present disclosure;

Referring to FIG. 1 , in a network environment 100 , an electronic device 101 communicates with an electronic device 102 through a first network 198 (eg, a short-range wireless communication network) or a second network 199 . It may communicate with the electronic device 104 or the server 108 through (eg, a long-distance wireless communication network). According to an embodiment, the electronic device 101 may communicate with the electronic device 104 through the server 108 . According to an embodiment, the electronic device 101 includes a processor 120 , a memory 130 , an input device 150 , a sound output device 155 , a display device 160 , an audio module 170 , and a sensor module ( 176 , interface 177 , haptic module 179 , camera module 180 , power management module 188 , battery 189 , communication module 190 , subscriber identification module 196 , or antenna module 197 . ) may be included. In some embodiments, at least one of these components (eg, the display device 160 or the camera module 180 ) may be omitted or one or more other components may be added to the electronic device 101 . In some embodiments, some of these components may be implemented as a single integrated circuit. For example, the sensor module 176 (eg, a fingerprint sensor, an iris sensor, or an illuminance sensor) may be implemented while being embedded in the display device 160 (eg, a display).

The processor 120, for example, executes software (eg, a program 140) to execute at least one other component (eg, a hardware or software component) of the electronic device 101 connected to the processor 120 . It can control and perform various data processing or operations. According to an embodiment, as at least part of data processing or operation, the processor 120 converts commands or data received from other components (eg, the sensor module 176 or the communication module 190) to the volatile memory 132 . may be loaded into the volatile memory 132 , process commands or data stored in the volatile memory 132 , and store the resulting data in the non-volatile memory 134 . According to an embodiment, the processor 120 includes a main processor 121 (eg, a central processing unit or an application processor), and an auxiliary processor 123 (eg, a graphic processing unit or an image signal processor) that can be operated independently or together with the main processor 121 . , a sensor hub processor, or a communication processor). Additionally or alternatively, the auxiliary processor 123 may be configured to use less power than the main processor 121 or to be specialized for a designated function. The auxiliary processor 123 may be implemented separately from or as a part of the main processor 121 .

The auxiliary processor 123 may be, for example, on behalf of the main processor 121 while the main processor 121 is in an inactive (eg, sleep) state, or when the main processor 121 is active (eg, executing an application). ), together with the main processor 121, at least one of the components of the electronic device 101 (eg, the display device 160, the sensor module 176, or the communication module 190) It is possible to control at least some of the related functions or states. According to an embodiment, the auxiliary processor 123 (eg, an image signal processor or a communication processor) may be implemented as a part of another functionally related component (eg, the camera module 180 or the communication module 190). have.

The memory 130 may store various data used by at least one component (eg, the processor 120 or the sensor module 176 ) of the electronic device 101 . The data may include, for example, input data or output data for software (eg, the program 140 ) and instructions related thereto. The memory 130 may include a volatile memory 132 or a non-volatile memory 134 .

The program 140 may be stored as software in the memory 130 , and may include, for example, an operating system 142 , middleware 144 , or an application 146 .

The input device 150 may receive a command or data to be used by a component (eg, the processor 120 ) of the electronic device 101 from the outside (eg, a user) of the electronic device 101 . The input device 150 may include, for example, a microphone, a mouse, a keyboard, or a digital pen (eg, a stylus pen).

The sound output device 155 may output a sound signal to the outside of the electronic device 101 . The sound output device 155 may include, for example, a speaker or a receiver. The speaker can be used for general purposes such as multimedia playback or recording playback, and the receiver can be used to receive incoming calls. According to an embodiment, the receiver may be implemented separately from or as a part of the speaker.

The display device 160 may visually provide information to the outside (eg, a user) of the electronic device 101 . The display device 160 may include, for example, a display, a hologram device, or a projector and a control circuit for controlling the corresponding device. According to an embodiment, the display device 160 may include a touch circuitry configured to sense a touch or a sensor circuit (eg, a pressure sensor) configured to measure the intensity of a force generated by the touch. have.

The audio module 170 may convert a sound into an electric signal or, conversely, convert an electric signal into a sound. According to an embodiment, the audio module 170 acquires a sound through the input device 150 , or an external electronic device (eg, a sound output device 155 ) directly or wirelessly connected to the electronic device 101 . The sound may be output through the electronic device 102 (eg, a speaker or a headphone).

The sensor module 176 detects an operating state (eg, power or temperature) of the electronic device 101 or an external environmental state (eg, user state), and generates an electrical signal or data value corresponding to the sensed state. can do. According to an embodiment, the sensor module 176 may include, for example, a gesture sensor, a gyro sensor, a barometric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an IR (infrared) sensor, a biometric sensor, It may include a temperature sensor, a humidity sensor, or an illuminance sensor.

The interface 177 may support one or more designated protocols that may be used for the electronic device 101 to directly or wirelessly connect with an external electronic device (eg, the electronic device 102 ). According to an embodiment, the interface 177 may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, or an audio interface.

The connection terminal 178 may include a connector through which the electronic device 101 can be physically connected to an external electronic device (eg, the electronic device 102 ). According to an embodiment, the connection terminal 178 may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (eg, a headphone connector).

The haptic module 179 may convert an electrical signal into a mechanical stimulus (eg, vibration or movement) or an electrical stimulus that the user can perceive through tactile or kinesthetic sense. According to an embodiment, the haptic module 179 may include, for example, a motor, a piezoelectric element, or an electrical stimulation device.

The camera module 180 may capture still images and moving images. According to an embodiment, the camera module 180 may include one or more lenses, image sensors, image signal processors, or flashes.

The power management module 188 may manage power supplied to the electronic device 101 . According to an embodiment, the power management module 388 may be implemented as, for example, at least a part of a power management integrated circuit (PMIC).

The battery 189 may supply power to at least one component of the electronic device 101 . According to an embodiment, the battery 189 may include, for example, a non-rechargeable primary cell, a rechargeable secondary cell, or a fuel cell.

The communication module 190 is a direct (eg, wired) communication channel or a wireless communication channel between the electronic device 101 and an external electronic device (eg, the electronic device 102, the electronic device 104, or the server 108). It can support establishment and communication through the established communication channel. The communication module 190 may include one or more communication processors that operate independently of the processor 120 (eg, an application processor) and support direct (eg, wired) communication or wireless communication. According to an embodiment, the communication module 190 is a wireless communication module 192 (eg, a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module 194 (eg, : It may include a local area network (LAN) communication module, or a power line communication module). Among these communication modules, a corresponding communication module is a first network 198 (eg, a short-range communication network such as Bluetooth, WiFi direct, or IrDA (infrared data association)) or a second network 199 (eg, a cellular network, the Internet, or It may communicate with an external electronic device via a computer network (eg, a telecommunication network such as a LAN or WAN). These various types of communication modules may be integrated into one component (eg, a single chip) or may be implemented as a plurality of components (eg, multiple chips) separate from each other. The wireless communication module 192 uses the subscriber information (eg, International Mobile Subscriber Identifier (IMSI)) stored in the subscriber identification module 196 within a communication network such as the first network 198 or the second network 199 . The electronic device 101 may be identified and authenticated.

The antenna module 197 may transmit or receive a signal or power to the outside (eg, an external electronic device). According to an embodiment, the antenna module may include one antenna including a conductor formed on a substrate (eg, a PCB) or a radiator formed of a conductive pattern. According to an embodiment, the antenna module 197 may include a plurality of antennas. In this case, at least one antenna suitable for a communication method used in a communication network such as the first network 198 or the second network 199 is connected from the plurality of antennas by, for example, the communication module 190 . can be selected. A signal or power may be transmitted or received between the communication module 190 and an external electronic device through the selected at least one antenna. According to some embodiments, other components (eg, RFIC) other than the radiator may be additionally formed as a part of the antenna module 197 .

At least some of the components are connected to each other through a communication method between peripheral devices (eg, a bus, general purpose input and output (GPIO), serial peripheral interface (SPI), or mobile industry processor interface (MIPI)) and a signal ( e.g. commands or data) can be exchanged with each other.

According to an embodiment, the command or data may be transmitted or received between the electronic device 101 and the external electronic device 104 through the server 108 connected to the second network 199 . Each of the electronic devices 102 and 104 may be the same or a different type of the electronic device 101 . According to an embodiment, all or a part of operations performed by the electronic device 101 may be performed by one or more of the external electronic devices 102 , 104 , or 108 . For example, when the electronic device 101 needs to perform a function or service automatically or in response to a request from a user or other device, the electronic device 101 may perform the function or service itself instead of executing the function or service itself. Alternatively or additionally, one or more external electronic devices may be requested to perform at least a part of the function or the service. The one or more external electronic devices that have received the request may execute at least a part of the requested function or service, or an additional function or service related to the request, and transmit a result of the execution to the electronic device 101 . The electronic device 101 may process the result as it is or additionally and provide it as at least a part of a response to the request. For this purpose, for example, cloud computing, distributed computing, or client-server computing technology may be used.

2 is a block diagram of a power management module and a battery according to various embodiments of the present disclosure;

Referring to FIG. 2 , the power management module 188 may include a charging circuit 210 , a power regulator 220 , or a power gauge 230 . The charging circuit 210 may charge the battery 189 using power supplied from an external power source for the electronic device 101 . According to an embodiment, the charging circuit 210 may include a type of external power (eg, a power adapter, USB or wireless charging), a size of power that can be supplied from the external power (eg, about 20 watts or more), or a battery 189 ), a charging method (eg, normal charging or fast charging) may be selected based on at least some of the properties, and the battery 189 may be charged using the selected charging method. The external power source may be connected to the electronic device 101 by wire through, for example, the connection terminal 178 or wirelessly through the antenna module 197 .

The power regulator 220 may generate a plurality of powers having different voltages or different current levels by, for example, adjusting a voltage level or a current level of power supplied from an external power source or battery 189 . The power regulator 220 may adjust the external power source or the power of the battery 189 to a voltage or current level suitable for each of some of the components included in the electronic device 101 . According to an embodiment, the power regulator 220 may be implemented in the form of a low drop out (LDO) regulator or a switching regulator. The power gauge 230 may measure usage state information about the battery 189 (eg, the capacity of the battery 189 , the number of times of charging and discharging, a voltage, or a temperature).

The power management module 188 may, for example, use the charging circuit 210 , the voltage regulator 220 , or the power gauge 230 , to control the battery 189 based at least in part on the measured usage state information. It is possible to determine charge-related state of charge information (eg, lifetime, overvoltage, undervoltage, overcurrent, overcharge, overdischarge, overheating, short circuit, or swelling). The power management module 188 may determine whether the battery 189 is normal or abnormal based at least in part on the determined state of charge information. When it is determined that the state of the battery 189 is abnormal, the power management module 188 may adjust charging of the battery 189 (eg, decrease charging current or voltage, or stop charging). According to an embodiment, at least some of the functions of the power management module 188 may be performed by an external control device (eg, the processor 120 ).

The battery 189 may include a battery protection circuit module (PCM) 240 , according to an embodiment. The battery protection circuit 240 may perform one or more of various functions (eg, a pre-blocking function) to prevent deterioration or burnout of the battery 189 . The battery protection circuit 240 is additionally or alternatively, a battery management system (battery management system) capable of performing various functions including cell balancing, capacity measurement of a battery, number of times of charge/discharge measurement, temperature measurement, or voltage measurement. BMS))).

According to an embodiment, at least a portion of the use state information or the charge state information of the battery 189 may include a corresponding sensor (eg, a temperature sensor), a power gauge 230 , or a power management module among the sensor modules 276 . (188) can be used. According to an embodiment, the corresponding sensor (eg, a temperature sensor) among the sensor modules 176 may be included as a part of the battery protection circuit 140 or disposed adjacent to the battery 189 as a separate device. can

Electronic devices according to various embodiments disclosed in this document may be devices of various types. 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 this document is not limited to the above-described devices.

The various embodiments of this document and the terms used therein are not intended to limit the technical features described in this document to specific embodiments, and 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 simply be used to distinguish the component from other components in question, and may refer to components in other aspects (e.g., importance or order) is not limited. 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.

As used herein, the term “module” may include a unit implemented in hardware, software, or firmware, and may be used interchangeably with terms such as, for example, logic, logic block, component, or circuit. 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 of the present document, one or more instructions stored in a storage medium (eg, the internal memory 136 or the external memory 138) readable by a machine (eg, the electronic device 101) may be implemented as software (eg, the program 140) including For example, the processor (eg, the processor 120 ) of the device (eg, the electronic device 101 ) may call at least one of one or more instructions stored from a storage medium and execute it. This makes it possible for the device to be operated to perform at least one function according to the at least one command called. The one or more instructions may include code generated by a compiler or code executable by an interpreter. The device-readable storage medium may be provided in the form of a non-transitory storage medium. Here, 'non-transitory' only means that the storage medium is a tangible device and does not contain a signal (eg, electromagnetic wave), and this term is used in cases where data is semi-permanently stored in the storage medium and It does not distinguish between temporary storage cases.

According to an embodiment, the method according to various embodiments disclosed in this document may be provided by being included in a computer program product. Computer program products may be traded between sellers and buyers as commodities. The computer program product is distributed in the form of a machine-readable storage medium (eg compact disc read only memory (CD-ROM)), or via an application store (eg Play Store™) or on two user devices ( It can be distributed (eg downloaded or uploaded) directly, online between smartphones (eg: smartphones). In the case of online distribution, at least a part of the computer program product may be temporarily stored or temporarily created in a machine-readable storage medium such as a memory of a server of a manufacturer, a server of an application store, or a relay server.

According to various embodiments, each component (eg, a module or a program) of the above-described components may include a singular or a plurality of entities. 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, omitted, or , or one or more other operations may be added.

3 is an exploded perspective view of an electronic device including a battery according to an exemplary embodiment;

Referring to FIG. 3 , the electronic device 300 includes a side bezel structure 310 , a first support member 311 (eg, a bracket), a front plate 320 , a display 330 , and a printed circuit board 340 . , a battery 350 , a second support member 360 (eg, a rear case), an antenna 370 , and a rear plate 380 . In some embodiments, the electronic device 300 may omit at least one of the components (eg, the first support member 311 or the second support member 360 ) or additionally include other components. .

The first support member 311 may be disposed inside the electronic device 300 and connected to the side bezel structure 310 , or may be integrally formed with the side bezel structure 310 . The first support member 311 may be formed of, for example, a metal material and/or a non-metal (eg, polymer) material. The first support member 311 may have a display 330 coupled to one surface and a printed circuit board 340 coupled to the other surface. The printed circuit board 340 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.

Memory may include, for example, volatile memory or non-volatile memory.

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 300 to an external electronic device, and may include a USB connector, an SD card/MMC connector, or an audio connector.

The battery 350 is a device for supplying power to at least one component of the electronic device 300 and may include, for example, a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell. . At least a portion of the battery 350 may be disposed substantially on the same plane as the printed circuit board 340 , for example. The battery 350 may be integrally disposed inside the electronic device 300 , or may be disposed detachably from the electronic device 300 . In an embodiment, the battery 350 may include a positive electrode plate, a negative electrode plate, and an electrode assembly including at least one separator and a pouch that do not include an insulating adhesive member. A detailed description thereof will be provided later.

The antenna 370 may be disposed between the rear plate 380 and the battery 350 . The antenna 370 may include, for example, a near field communication (NFC) antenna, a wireless charging antenna, and/or a magnetic secure transmission (MST) antenna. The antenna 370 may, for example, perform short-range communication with an external device or wirelessly transmit/receive power required for charging. In another embodiment, the antenna structure may be formed by a part of the side bezel structure 310 and/or the first support member 311 or a combination thereof.

FIG. 4A schematically illustrates a structure of a battery included in the electronic device of FIG. 3 .

Referring to FIG. 4A , the battery 350 may include a pouch 410 , an electrode assembly 420 , a positive electrode tab 451 , and a negative electrode tab 452 .

In an embodiment, the pouch 410 is a structure that provides an internal space 413 in which the electrode assembly 420 is accommodated, and is a 'can', a 'case', a 'housing' or an 'exterior material'. may be replaced by various other terms, such as In an embodiment, the pouch 410 may include a first plate 411 and a second plate 412 spaced apart from each other with an internal space 413 interposed therebetween. In one embodiment, the pouch 410 may be formed of a metal such as aluminum, an aluminum alloy, or a non-metal such as a polymer. In an embodiment, the pouch 410 may be formed of a material having flexibility.

In one embodiment, the electrode assembly 420 is a structure prepared by winding the positive electrode plate 421, the negative electrode plate 422, and the separator 423 to overlap and roll them together, and may have a jelly roll shape. have. In one embodiment, after disposing the electrode assembly 420 in the inner space 413 of the pouch 410 , by a series of processes for injecting and sealing an electrolyte, the electrode assembly 420 is formed from the pouch 410 . It may be disposed with the electrolyte in the inner space 413 of the. In one embodiment, the electrolyte is a medium that allows lithium ions to move between the positive electrode plate 421 or the negative electrode plate 422 , and may include a liquid, solid, or gel-like material.

In an embodiment, the positive electrode plate 421 may include a positive electrode substrate and a positive electrode mixture coated on the positive electrode substrate. The battery capacity and voltage may be determined according to a loading level of the positive electrode mixture in the positive electrode plate 421 . In an embodiment, the cathode substrate may correspond to a plate or layer (eg, aluminum (Al) foil) including a metal such as aluminum. In an embodiment, the positive electrode mixture may be produced through a process of mixing a positive electrode active material, a conductive agent, and a binder. In one embodiment, the positive electrode active material is a material involved in the electrode reaction, and may include a lithium-based oxide as a main component. The conductive agent is a material for increasing conductivity, and the binder may increase bonding strength between the positive electrode active material and the conductive agent.

In an embodiment, the negative electrode plate 422 may include a negative electrode substrate and a negative electrode mixture coated on the negative electrode substrate. In an embodiment, the negative electrode substrate may correspond to a plate or layer (eg, copper (Cu) foil) including a metal such as copper. In an embodiment, the negative electrode mixture may be produced through a process of mixing the negative electrode active material, the conductive agent, and the binder. In an embodiment, the negative active material may include graphite as a main component.

In an embodiment, the separator 423 may be disposed between the positive electrode plate 421 and the negative electrode plate 422 to prevent physical contact between the positive electrode plate 421 and the negative electrode plate 422 . In an embodiment, the battery in the form of a jelly roll may include at least two separators 423 . For example, when the electrode assembly 420 including the two separators 423 is manufactured, the separator 423 , the negative electrode plate 422 , the separator 423 , and the positive electrode plate 421 may be overlapped and wound in this order. . By disposing the separator 423 on one and the other surfaces of the positive electrode plate 421 and the negative electrode plate 422 , contact between the positive electrode plate 421 and the negative electrode plate 422 that may occur in the process of winding the electrode assembly 420 . can prevent In an embodiment, the separator 423 may include at least one of polyethylene (PE) and polypropylene (PP). For example, the separator 423 may be formed of a single layer including polyethylene (PE) or a single layer including polypropylene (PP). As another example, the separator 423 may be formed of two layers in which a polyethylene (PE) layer and a polypropylene (PP) layer are bonded. As another example, the separator 423 may be formed of three or more layers in which a polypropylene (PP) layer, a polyethylene (PE) layer, and a polypropylene (PP) layer are alternately bonded. .

In an embodiment, the battery 350 is not limited to the shape shown in FIG. 4A and may be formed in various other shapes. For example, the battery may include a cylindrical pouch and an electrode assembly in a circularly rolled shape within the pouch. The battery may be formed in a variety of other shapes.

4B schematically illustrates a structure of a battery module including a plurality of batteries.

Referring to FIG. 4B , the battery module 450 may include a plurality of batteries 350a, 350b, 350c, 350d, 350e, and 350f and a housing 430 surrounding the plurality of batteries. In an embodiment, the plurality of batteries 350a to 350f may be stacked and arranged side by side. In an embodiment, the plurality of batteries 350a to 350f may be connected in series or in parallel depending on the purpose, but FIG. 4B illustrates a situation in which they are connected in series. In an embodiment, the positive electrode tabs 451a to 451f and the negative electrode tabs 452a to 452f of the plurality of batteries 350a to 350f may be alternately disposed. For example, a battery 350a including a positive tab 451a and a negative tab 452a may be staggered to a battery 350b including a positive tab 451b and negative tab 452b and connected in series. . The positive tab 451a of the battery 350a may be electrically connected to the negative tab 452b of the battery 350b. The positive electrode tab 451b of the battery 350b may be electrically connected to the negative electrode tab 452c of the battery 350c.

Although FIG. 4B shows only the battery module 450 including six batteries 350a to 350f, the number of batteries included in the battery module is not limited thereto and may be changed according to use.

5A illustrates a structure of a positive electrode plate included in an electrode assembly of a battery according to an exemplary embodiment.

Referring to FIG. 5A , the positive electrode plate 421 may include a positive electrode substrate 512 , a positive electrode coating layer 513 coated with a positive electrode mixture on the surface of the positive electrode substrate 512 , and a positive electrode tab 511 . In an embodiment, the positive electrode plate 421 may include a first surface and a second surface facing in a direction opposite to the first surface. In an embodiment, the first and second surfaces of the positive electrode plate 421 may include a region coated with the positive electrode coating layer 513 and an uncoated region on which the positive electrode coating layer 513 is not coated. In an embodiment, the first region where the positive electrode coating layer 513 is coated on the first surface of the positive electrode plate 421 and the third region where the positive electrode coating layer 513 is coated on the second surface of the positive electrode plate 421 are formed differently can be For example, the region of the positive electrode coating layer 513 may include a region for coating both the first and second surfaces of the positive electrode plate 421 and a region for coating only the first surface of the positive electrode plate 421 .

In an embodiment, the positive electrode plate 421 may not include an insulating adhesive member. In an embodiment, the capacity of the battery (eg, the battery 350 of FIG. 3 ) may increase by not attaching insulating adhesive members to both ends of the positive electrode coating layer 513 . In an embodiment, the thickness of the electrode assembly (eg, the electrode assembly 420 of FIG. 4A ) is reduced by omitting the insulating adhesive members at both ends of the positive electrode coating layer 513 , and the thickness of the positive electrode mixture is equal to the thickness of the insulating adhesive member. You can compensate the loading level. For example, in the battery manufacturing process according to the comparative example, an insulating adhesive member having a predetermined thickness, for example, a thickness of about 12 μm, is disposed on both ends of the coating layer, but according to various embodiments of the present disclosure, the first surface both ends of the anode coating layer 513 (eg, the tip 520 and the end 522 of the first region) and both ends of the anode coating layer 513 of the second surface (eg, the tip 524 of the third region) and The insulating adhesive member may be omitted at the end 526). As the insulating adhesive member is omitted on the first and second surfaces of the positive electrode plate 421 , the overall thickness of the positive electrode plate 421 may be reduced by about 24 μm compared to the comparative embodiment, for example. As another example, a winding process of overlapping the positive electrode plate 421, the negative electrode plate 422, and the separator 423 and winding them together to produce an electrode assembly (eg, the electrode assembly 420 of FIG. 4A ) may be performed. , one positive electrode plate 421 may be arranged in at least two or more layers. As the positive electrode plate 421 is wound, a portion of the first surface of the positive electrode plate 421 is on the first plate (eg, the first plate 411 of FIG. 4A ) of the pouch (eg, the pouch 410 of FIG. 4A ). It is disposed proximate, and another portion of the first side may be disposed proximate to the second plate of the pouch 410 (eg, the second plate 412 of FIG. 4A ). When the positive electrode plate 421 is disposed in two layers, the front end 520 and the end 522 of the first region on the first surface of the positive electrode plate 421 , and the tip of the third region on the second surface of the positive electrode plate 421 . As the insulating adhesive member at the 524 and the end 526 is omitted, the total thickness of the electrode assembly 420 may be reduced by about 50 μm. In an embodiment, the coating process may be performed in a manner that compensates for the amount of the positive electrode mixture in consideration of the length, width, and the like of the insulating adhesive member in the longitudinal direction. For example, when the length in the longitudinal direction of the omitted insulating adhesive member corresponds to about 10 cm, the length in the width direction corresponds to about 1 cm, and the total thickness of the insulating adhesive member is about 50 μm, as the insulating adhesive member is omitted A positive electrode mixture corresponding to about 0.05 cm 3 may be additionally coated.

FIG. 5B shows a partial region of a cross-sectional view of the battery of FIG. 4A taken in the A-A' direction. FIG. 5B may correspond to a partial region of a cross-sectional view of the battery of FIG. 4A taken in the direction A-A' and viewed in the +z direction.

Referring to FIG. 5B , the electrode assembly 420 may include a positive electrode plate 421 , a negative electrode plate 422 , a first separator 423a , and a second separator 423b . In one embodiment, the electrode assembly 420 may include a first separator 423a disposed between the positive electrode plate 421 and the negative electrode plate 422 , and the first separator 423a of the negative electrode plate 422 is disposed. A second separator 423b disposed on a surface opposite to the surface may be included. In another embodiment, the second separator 423b may be disposed on a surface opposite to the surface on which the first separator 423a of the positive electrode plate 421 is disposed.

In an embodiment, the positive electrode plate 421 may include a positive electrode substrate 512 and a positive electrode coating layer 513 in which a positive electrode mixture is coated on at least a portion of the positive electrode substrate 512 . In FIG. 5B , in order to understand the structure of the electrode assembly 420 , the positive electrode coating layer 513 of the positive electrode plate 421 and the separator 423a facing it are illustrated as being separated from each other, but substantially the positive electrode coating layer 513 . And at least a portion of the separation membrane 423a facing it may be adhered to each other due to the binder component of the separation membrane 423a. In an embodiment, the negative electrode coating layer of the negative electrode plate 422 and at least a portion of the separator 423b facing it may be adhered to each other due to the binder component of the separator 423b.

In an embodiment, the battery (eg, the battery 350 of FIG. 3 ) includes a pouch (eg, the pouch 410 of FIG. 4A ), and a negative electrode plate (eg, FIG. The negative electrode plate 422 of 4a), the positive electrode plate (eg, the positive electrode plate 421 of FIG. 4A ) coated on at least part of the positive electrode mixture including the positive electrode active material, and at least one separator disposed between the negative electrode plate and the positive electrode plate (eg: The separator 423 of FIG. 4A may include an electrode assembly (eg, the electrode assembly 420 of FIG. 4A ) wound and accommodated in the pouch, and the positive electrode plate may not include an insulating adhesive member.

In an embodiment, the positive electrode plate includes a first surface and a second surface facing the opposite direction to the first surface, and the first surface is a coating layer coated with the positive electrode mixture (eg, the positive electrode coating layer 513 of FIG. 5A ). )) including a first region and a second region on which the positive electrode mixture is not coated, and the second surface includes a coating layer (eg, the positive electrode coating layer 513 of FIG. 5A ) coated with the positive electrode mixture It may include a third region and a fourth region on which the positive electrode mixture is not coated.

In an embodiment, in the positive electrode plate, the thickness of the coating layer of the first region and the coating layer of the third region may be formed to be substantially uniform.

In an embodiment, in the positive electrode plate, the length of the coating layer in the first region and the length of the coating layer in the third region may be different from each other.

In an embodiment, at least a portion of the first surface of the positive electrode plate may be disposed on the outer surface of the electrode assembly to contact the inner surface of the pouch, and the second surface of the positive electrode plate may be formed to contact the at least one separator have.

In an embodiment, both ends of the coating layer in the first region and both ends of the coating layer in the third region of the positive electrode plate may be formed to have smooth sides.

6 is a flowchart illustrating a manufacturing process of a positive electrode plate of a battery according to an exemplary embodiment.

7 shows a state of the positive electrode plate according to the manufacturing process of FIG.

In describing the manufacturing process of the positive electrode plate of FIG. 6 , it will be described with reference to the configuration of FIG. 7 .

Referring to FIG. 6 , the manufacturing process of a positive electrode plate (eg, positive electrode plate 421 in FIG. 4A ) is performed on a positive electrode substrate (eg, positive electrode substrate 512 in FIG. 5 ) as shown in FIG. Step 601 where 700, 702 are attached may be included. In an embodiment, the heat-shrinkable tapes 700 and 702 are spaced apart from each other and attached, and the interval between the heat-shrinkable tapes 700 and 702 may be appropriately set in advance. In an embodiment, the spacing between the heat-shrinkable tapes 700 and 702 may be determined by reflecting the size of the battery. In another embodiment, the heat-shrinkable tapes 700 and 702 may be determined by reflecting the size for slitting into a plurality of positive electrode plates. In an embodiment, the first heat-shrinkable tape 700 and the second heat-shrinkable tape 702 may be sequentially attached or may be attached simultaneously depending on the progress direction of the process.

In an embodiment, the heat-shrinkable tapes 700 and 702 attached in step 601 may refer to a tape in which the adhesive force (or adhesive force) of the tape is weakened below a certain level or the adhesive force disappears as the temperature increases. For example, the heat-shrinkable tapes 700 and 702 may mean a tape having an adhesive strength of 1000 gf/25 mm or more at room temperature, but having an adhesive strength of 20 gf/25 mm or less at a high temperature (eg, 80° C. or more).

According to an embodiment, in step 603 , the positive electrode substrate 512 may be coated by applying a slurry (eg, positive electrode mixture). In one embodiment, the nozzle for applying the slurry may start application of the slurry at the point where the first heat-shrinkable tape 700 is attached, and stop applying the slurry at the point where the second heat-shrinkable tape 702 is attached. can do. In an embodiment, the slurry applied on the positive electrode substrate 512 may form a coating layer 513 coated with a uniform thickness through a coating roll (not shown). In one embodiment, the rotation speed of the coating roll may be set to be the same in order to form the same coating layer 513 on the first and second surfaces of the positive electrode plate (eg, the positive electrode plate 421 of FIG. 4A ). The coating time may be controlled through a timer in order to make the coating length of the first side and the second side different. In one embodiment, as the process 603 proceeds, as shown in FIG. 7B , the slurry may be applied on the positive electrode substrate 512 to form the positive electrode coating layer 513 .

According to an embodiment, in step 605, the cathode substrate 512 to which the slurry is applied passes through the drying furnace 704, and the adhesive force of the heat-shrinkable tape may be lost. According to an embodiment, the heat-shrinkable tape may be removed from the positive electrode substrate 512 in step 607 . In one embodiment, the point to which the first heat-shrinkable tape 700 is attached passes first through the drying furnace 704 , and then the point to which the second heat-shrinkable tape 702 is attached passes through the drying furnace 704 . have. In an embodiment, the drying furnace 704 may maintain a high temperature in order to remove the solvent and moisture in the slurry applied on the positive electrode substrate 512 . For example, when the adhesive force of the heat-shrinkable tape 700 attached to the positive electrode substrate 512 is lost at 80°C, the drying furnace 704 may be set and maintained at a temperature of 80°C or higher. In an embodiment, the heat-shrinkable tapes 700 and 702 whose adhesive force is lost as they pass through the drying furnace 704 may be removed through a suction (not shown) near the outlet of the drying furnace 704 . In an embodiment, the adhesive force of the first heat-shrinkable tape 700 introduced first into the drying furnace 704 is lost as it passes through the drying furnace 704, and as shown in (c) of FIG. 7 , the first heat-shrinkable tape 700 The tape 700 may be removed from the positive electrode substrate 512 before the second heat-shrinkable tape 702 . In one embodiment, the second heat-shrinkable tape 702 passing through the drying furnace 704 may gradually lose its adhesive force in response to a high temperature. In one embodiment, as the second heat-shrinkable tape 702 is removed from the positive electrode substrate 512 , the positive electrode substrate 512 has the heat-shrinkable tapes 700 and 702 removed as shown in FIG. 7D . An anode coating layer 513 may be included.

6 and 7 show only a method of removing the non-uniform both ends of the positive electrode coating layer 513 through the heat shrinkable tapes 700 and 702, but in another embodiment, both ends of the positive electrode coating layer 513 (eg, in FIG. The front end 520 and the end 522 of the first region 5a, and the front end 524 and the end 526 of the third region) may be etched using a laser. In an embodiment, only a non-uniform portion of the anode coating layer 513 may be removed by etching the anode coating layer 513 by adjusting the intensity of the laser.

FIG. 8 shows a side view of a positive electrode plate according to the manufacturing process of FIG. 6 . FIG. 8 may correspond to a side view of FIG. 7(b) viewed in a direction ① and a side view of FIG. 7(d) viewed in a direction ①.

The positive electrode plate of FIG. 8 may correspond to the positive electrode plate (eg, the positive electrode substrate 512 and the positive electrode coating layer 513 ) illustrated in FIGS. 7B and 7D . Accordingly, descriptions identical to, corresponding to, or similar to those described in FIG. 7 will be omitted.

Referring to FIG. 8 , as the slurry is applied on the positive electrode substrate 512 , both ends of the positive electrode coating layer 513 may have non-uniform thicknesses. For example, the slurry may rise at the point where the coating of the slurry starts (eg, the point where the first heat-shrink tape 700 is attached), and the point where the coating of the slurry ends (eg, the second heat-shrink tape 702) is attached), the slurry may be attracted. In an embodiment, as it passes through a drying furnace (eg, the drying furnace 704 of FIG. 7 ), the adhesive force of the first heat-shrinkable tape 700 and the second heat-shrinkable tape 702 may disappear and be removed. In one embodiment, both ends of the positive electrode coating layer 513 from which the first heat-shrinkable tape 700 and the second heat-shrinkable tape 702 are removed (eg, the front end 520 and the end 522 of the first region) are smooth sides may include. For example, as the first heat-shrinkable tape 700 and the second heat-shrinkable tape 702 are removed, the positive electrode coating layer 513 applied on the first heat-shrinkable tape 700 and the second heat-shrinkable tape 702 is together Conditions of the drying furnace 704 may be controlled so that they can be removed. The temperature of the drying furnace 704 may be controlled so that the anode coating layer 513 introduced into the drying furnace 704 has a suitable degree of drying to be removed together with the heat-shrinkable tapes 700 and 702 . As it passes through the controlled drying furnace 704 at a specific temperature (eg, 80° C.), the anode coating layer 513 may have a specific degree of drying (eg, moisture content of 10%), and may be disposed on the heat-shrinkable tapes 700 and 702. As the applied positive electrode coating layer 513 is removed together with the heat-shrinkable tapes 700 and 702 , the positive electrode coating layer 513 may form a smooth side surface.

Claims (20)

in the battery,
pouch; and
A negative electrode plate in which a negative electrode mixture including a negative electrode active material is coated on at least a part, a positive electrode plate in which at least a portion of the positive electrode mixture containing a positive electrode active material is coated, and at least one separator disposed between the negative electrode plate and the positive electrode plate is wound, comprising an electrode assembly accommodated in a pouch;
The positive electrode plate does not include an insulating adhesive member. The method according to claim 1,
The positive plate includes a first surface and a second surface facing the opposite direction to the first surface,
The first surface includes a first region including a coating layer coated with the positive electrode mixture and a second region on which the positive electrode mixture is not coated,
The second surface includes a third region including a coating layer coated with the positive electrode mixture and a fourth region on which the positive electrode mixture is not coated. 3. The method according to claim 2,
A battery in which the thickness of the coating layer of the first region and the coating layer of the third region is substantially uniform. 3. The method according to claim 2,
A battery in which the length of the coating layer of the first region and the length of the coating layer of the third region are different from each other. 3. The method according to claim 2,
At least a portion of the first surface of the positive electrode plate is disposed on the outer surface of the electrode assembly to contact the inner surface of the pouch,
The second surface of the positive electrode plate is formed to be in contact with the at least one separator. 3. The method according to claim 2,
Both ends of the coating layer of the first region and both ends of the coating layer of the third region are formed to have smooth sides. The method according to claim 1,
The foldable outer surface of the electrode assembly is formed in a curved surface, and the pouch is formed to correspond to a shape of the electrode assembly. at least one battery;
the at least one battery,
pouch; and
A negative electrode plate coated with a negative electrode mixture containing a negative electrode active material, a positive electrode plate coated with a positive electrode mixture containing a positive electrode active material, and at least one separator disposed between the negative electrode plate and the upper positive electrode plate are wound to obtain an electrode assembly accommodated in the pouch including,
Both ends of the coating layer coated with the positive electrode mixture are formed to have smooth sides. 9. The method of claim 8,
The positive plate includes a first surface and a second surface facing the opposite direction to the first surface,
The first surface includes a first region including a coating layer coated with the positive electrode mixture and a second region on which the positive electrode mixture is not coated,
The second surface of the battery module includes a third region including a coating layer coated with the positive electrode mixture and a fourth region on which the positive electrode mixture is not coated. 10. The method of claim 9,
A battery module in which the thickness of the coating layer of the first region and the coating layer of the third region is substantially uniformly formed 10. The method of claim 9,
The battery module, wherein the length of the coating layer of the first region and the length of the coating layer of the third region are formed to be different from each other. 10. The method of claim 9,
At least a portion of the first surface of the positive electrode plate is disposed on the outer surface of the electrode assembly to contact the inner surface of the pouch,
The second surface of the positive electrode plate is formed to be in contact with the at least one separator, the battery module. 9. The method of claim 8,
Both ends of the coating layer are formed to have smooth sides through at least one of laser etching or removal of a heat shrink adhesive member. 9. The method of claim 8,
The foldable outer surface of the electrode assembly is formed in a curved surface, and the pouch is formed to correspond to a shape of the electrode assembly, the battery module. In an electronic device,
a front plate forming a front surface of the electronic device;
a rear plate forming a rear surface of the electronic device;
a bracket surrounding the front plate and the rear plate and forming a side surface of the electronic device; and
A battery disposed on at least one surface of the bracket,
The battery is
pouch; and
A negative electrode plate coated with a negative electrode mixture containing a negative electrode active material, a positive electrode plate coated with a positive electrode mixture containing a positive electrode active material, and at least one separator disposed between the negative electrode plate and the positive electrode plate are wound and the electrode assembly accommodated in the pouch including,
The positive electrode plate does not include an insulating adhesive member. The method according to claim 1,
The positive plate includes a first surface and a second surface facing the opposite direction to the first surface,
The first surface includes a first region including a coating layer coated with the positive electrode mixture and a second region on which the positive electrode mixture is not coated,
The second surface may include a third region including a coating layer coated with the positive electrode mixture and a fourth region on which the positive electrode mixture is not coated. 17. The method of claim 16,
and thicknesses of the coating layer of the first region and the coating layer of the third region are formed to be substantially uniform. 17. The method of claim 16,
The electronic device, wherein the length of the coating layer in the first region and the length of the coating layer in the third region are formed to be different from each other. 17. The method of claim 16,
At least a portion of the first surface of the positive electrode plate is disposed on the outer surface of the electrode assembly to contact the inner surface of the pouch,
The second surface of the positive electrode plate is formed to be in contact with the at least one separator. 17. The method of claim 16,
Both ends of the coating layer of the first region and both ends of the coating layer of the third region are formed to have smooth sides.

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