All-solid-state battery defect detection device, system and method

Abstract

The invention relates to an all-solid-state battery defect detection device, system and method. An exemplary embodiment of the present disclosure provides an all-solid-state battery defect detection apparatus, including: a processor configured to detect a defect of an all-solid-state battery by measuring a pressure distribution of the all-solid-state battery at the end of charging and discharging of the all-solid-state battery immediately after fastening a pressurization jig to the all-solid-state battery; and a memory configured to store data and an algorithm driven by the processor.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of Korean Patent Application No. 10-2023-0107850 filed in the Korean Intellectual Property Office on August 17, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to an all-solid-state battery defect detection device, system and method, and more particularly, to an all-solid-state battery defect detection technology using pressure distribution. Background Art

[0004] Secondary batteries are batteries that can be repeatedly charged and discharged and are widely used in high-tech devices such as mobile phones, laptops, and electric vehicles. Recently, the demand for secondary batteries with high energy density and high output has been increasing, and all-solid-state batteries have attracted attention as the next-generation technology.

[0005] Compared with conventional lithium-ion batteries, all-solid-state batteries, which are batteries using a solid electrolyte between a positive electrode layer and a negative electrode layer, can increase energy density, reduce volume, and greatly improve stability by using a solid electrolyte.

[0006] Due to this characteristic of all-solid-state batteries, a pressurizing fixture must be used to continuously apply uniform high pressure. In this case, if the pressurizing fixture is not tightened uniformly, uneven pressure may be applied to the all-solid-state battery, resulting in uneven lithium metal deposition or desorption and volume expansion or contraction of certain parts, and the parts where such expansion or contraction occurs may deteriorate rapidly, thereby negatively affecting the quality (safety, durability, etc.) of the all-solid-state battery. Summary of the invention

[0007] Exemplary embodiments of the present disclosure attempt to provide an all-solid-state battery defect detection apparatus, system, and method that are capable of accurately detecting defects of an all-solid-state battery using pressure distribution.

[0008] In addition, exemplary embodiments of the present disclosure attempt to provide an all-solid-state battery defect detection device, system and method, which are capable of detecting defects of the all-solid-state battery by measuring the pressure distribution immediately after tightening the pressurized clamp of the all-solid-state battery, at the end of charging of the all-solid-state battery, and at the end of discharging of the all-solid-state battery, thereby accurately detecting defects in the all-solid-state battery.

[0009] The technical objectives of the present disclosure are not limited to the above objectives, and those skilled in the art can clearly understand other technical objectives not mentioned from the description of the claims.

[0010] An exemplary embodiment of the present disclosure provides an all-solid-state battery defect detection device, comprising: a processor configured to detect defects of an all-solid-state battery by utilizing pressure distribution measurements of the all-solid-state battery immediately after a pressurizing clamp is fastened to the all-solid-state battery and at the end of charging and discharging of the all-solid-state battery; and a storage device configured to store data and algorithms driven by the processor.

[0011] In an exemplary embodiment of the present disclosure, the processor may be configured to detect a defect of the all-solid-state battery by comparing a pressure distribution standard deviation value measured immediately after fastening the pressurizing jig to the all-solid-state battery with a predetermined reference value.

[0012] In an exemplary embodiment of the present disclosure, the processor may be configured to detect a defect of the all-solid-state battery by comparing a pressure distribution standard deviation value measured at the end of charging of the all-solid-state battery with a predetermined reference value.

[0013] In an exemplary embodiment of the present disclosure, the charging end of the all-solid-state battery may refer to a state where charging of the all-solid-state battery starts and a state of charge (SOC) of the all-solid-state battery reaches a predetermined reference value.

[0014] In an exemplary embodiment of the present disclosure, the processor may be configured to detect a defect of the all-solid-state battery by comparing a pressure distribution standard deviation value measured at the end of discharge of the all-solid-state battery with a predetermined reference value.

[0015] In an exemplary embodiment of the present disclosure, the end of discharge of the all-solid-state battery may refer to a state in which discharge of the all-solid-state battery begins and a depth of discharge (DOD) reaches a predetermined reference value.

[0016] In an exemplary embodiment of the present disclosure, the processor may be configured to determine a predetermined reference value according to an amount of pressure applied to a battery cell of the all-solid-state battery and a size of the battery cell.

[0017] An exemplary embodiment of the present disclosure provides an all-solid-state battery defect detection system, comprising: a surface pressure sensor configured to measure the pressure distribution of the all-solid-state battery; and an all-solid-state battery defect detection device configured to detect defects of the all-solid-state battery by utilizing the pressure distribution measurement of the all-solid-state battery measured by the surface pressure sensor immediately after the pressurizing clamp is fastened to the all-solid-state battery and at the end of charging and discharging of the all-solid-state battery.

[0018] In an exemplary embodiment of the present disclosure, a surface pressure sensor may be configured to measure pressure distribution of a positive electrode of an all-solid-state battery.

[0019] In an exemplary embodiment of the present disclosure, a surface pressure sensor may be configured to be provided between a pressurizing jig and an all-solid-state battery.

[0020] In an exemplary embodiment of the present disclosure, an all-solid-state battery defect detection apparatus may be configured to detect defects of an all-solid-state battery by comparing a pressure distribution standard deviation value measured immediately after a pressurizing fixture is fastened to the all-solid-state battery with a predetermined reference value.

[0021] In an exemplary embodiment of the present disclosure, an all-solid-state battery defect detection apparatus may be configured to detect defects of an all-solid-state battery by comparing a pressure distribution standard deviation value measured at the end of charging of the all-solid-state battery with a predetermined reference value.

[0022] In an exemplary embodiment of the present disclosure, the all-solid-state battery defect detection apparatus may be configured to detect defects of an all-solid-state battery by comparing a pressure distribution standard deviation value measured at the end of discharge of the all-solid-state battery with a predetermined reference value.

[0023] An exemplary embodiment of the present disclosure provides an all-solid-state battery defect detection method, comprising: detecting defects of the all-solid-state battery by measuring the pressure distribution of the all-solid-state battery immediately after a pressurizing clamp is fastened to the all-solid-state battery; detecting defects of the all-solid-state battery by measuring the pressure distribution of the all-solid-state battery at the end of charging of the all-solid-state battery; and detecting defects of the all-solid-state battery by measuring the pressure distribution of the all-solid-state battery at the end of discharging of the all-solid-state battery.

[0024] In an exemplary embodiment of the present disclosure, detecting defects in an all-solid-state battery by measuring the pressure distribution of the all-solid-state battery immediately after the pressurizing clamp is fastened to the all-solid-state battery may include: comparing the standard deviation value of the pressure distribution measured immediately after the pressurizing clamp is fastened to the all-solid-state battery with a predetermined reference value; and determining that the all-solid-state battery is defective in response to the fact that the standard deviation value of the pressure distribution measured immediately after the pressurizing clamp is fastened to the all-solid-state battery is equal to or greater than the predetermined reference value.

[0025] In an exemplary embodiment of the present disclosure, detecting defects in an all-solid-state battery by measuring the pressure distribution of an all-solid-state battery at the end of charging of the all-solid-state battery may include: comparing a standard deviation value of the pressure distribution measured at the end of charging of the all-solid-state battery with a predetermined reference value; and determining that the all-solid-state battery is defective in response to a situation in which the standard deviation value of the pressure distribution measured at the end of charging of the all-solid-state battery is equal to or greater than the predetermined reference value.

[0026] In an exemplary embodiment of the present disclosure, detecting defects in an all-solid-state battery by measuring the pressure distribution of an all-solid-state battery at the end of discharge of the all-solid-state battery may include: comparing a standard deviation value of the pressure distribution measured at the end of discharge of the all-solid-state battery with a predetermined reference value; and determining that the all-solid-state battery is defective in response to a situation in which the standard deviation value of the pressure distribution measured at the end of discharge of the all-solid-state battery is equal to or greater than the predetermined reference value.

[0027] In an exemplary embodiment of the present disclosure, the charging end of the all-solid-state battery may refer to a state where charging of the all-solid-state battery starts and a state of charge (SOC) of the all-solid-state battery reaches a predetermined reference value.

[0028] In an exemplary embodiment of the present disclosure, the end of discharge of the all-solid-state battery may refer to a state in which discharge of the all-solid-state battery begins and a depth of discharge (DOD) reaches a predetermined reference value.

[0029] In an exemplary embodiment of the present disclosure, the all-solid-state battery defect detection method may further include determining a predetermined reference value according to an amount of pressure applied to a battery cell of the all-solid-state battery and a size of the battery cell.

[0030] According to the present technology, it is possible to accurately detect defects of all-solid-state batteries using pressure distribution.

[0031] According to this technology, defects of the all-solid-state battery can be detected by measuring the pressure distribution immediately after tightening the pressurized clamp of the all-solid-state battery, at the end of charging of the all-solid-state battery, and at the end of discharging of the all-solid-state battery, thereby accurately detecting defects in the all-solid-state battery.

[0032] In some embodiments, an all-solid-state battery defect detection device is provided. The device includes a processor configured to detect defects of the all-solid-state battery by: measuring the pressure distribution of the all-solid-state battery; determining a pressure distribution standard deviation value based on the measured pressure distribution; and comparing the pressure distribution standard deviation value with a predetermined reference value. The device further includes a storage device configured to store data and algorithms driven by the processor.

[0033] The pressure distribution standard deviation value determined based on the pressure distribution measured immediately after the pressurizing jig is fastened to the all-solid-state battery may be compared with a predetermined reference value.

[0034] A pressure distribution standard deviation value determined based on pressure distribution measured during a charging period in which a state of charge (SOC) of the all-solid-state battery increases from about 50% to about 100% may be compared with a predetermined reference value.

[0035] A pressure distribution standard deviation value determined based on pressure distribution measured during a discharge period in which a state of charge (SOC) of the all-solid-state battery drops from about 50% to about 0% may be compared with a predetermined reference value.

[0036] The processor may be configured to determine the predetermined reference value based on an amount of pressure applied to the battery cell of the all-solid-state battery and a size of the battery cell.

[0037] In some embodiments, a system for detecting defects in an all-solid-state battery is provided. The system includes: a surface pressure sensor configured to measure the pressure distribution of the all-solid-state battery; and an all-solid-state battery defect detection device configured to detect defects in the all-solid-state battery by: measuring the pressure distribution of the all-solid-state battery; determining a pressure distribution standard deviation value based on the measured pressure distribution; and comparing the pressure distribution standard deviation value with a predetermined reference value.

[0038] The surface pressure sensor can be configured to measure the pressure distribution of the positive electrode of the all-solid-state battery.

[0039] The surface pressure sensor may be configured to be disposed between the pressurizing jig and the all-solid-state battery.

[0040] The all-solid-state battery defect detection apparatus may be configured to detect defects of the all-solid-state battery by comparing a pressure distribution standard deviation value determined based on pressure distribution measured immediately after fastening the pressurizing jig to the all-solid-state battery with a predetermined reference value.

[0041] An all-solid-state battery defect detection device can be configured to detect defects of an all-solid-state battery by comparing a pressure distribution standard deviation value determined based on the pressure distribution measured during a charging period in which the state of charge (SOC) of the all-solid-state battery increases from approximately 50% to approximately 100% with a predetermined reference value.

[0042] An all-solid-state battery defect detection device can be configured to detect defects of an all-solid-state battery by comparing a pressure distribution standard deviation value determined based on pressure distribution measured during a discharge period in which the state of charge (SOC) of the all-solid-state battery drops from approximately 50% to approximately 0% with a predetermined reference value.

[0043] In some embodiments, a method for detecting defects in an all-solid-state battery is provided, comprising: measuring the pressure distribution of the all-solid-state battery; determining a pressure distribution standard deviation value based on the measured pressure distribution; and comparing the pressure distribution standard deviation value with a predetermined reference value.

[0044] The pressure distribution standard deviation value determined based on the pressure distribution measured immediately after the pressurizing jig is fastened to the all-solid-state battery may be compared with a predetermined reference value.

[0045] A pressure distribution standard deviation value determined based on pressure distribution measured during a charging period in which a state of charge (SOC) of the all-solid-state battery increases from about 50% to about 100% may be compared with a predetermined reference value.

[0046] A pressure distribution standard deviation value determined based on pressure distribution measured during a discharge period in which a state of charge (SOC) of the all-solid-state battery drops from about 50% to about 0% may be compared with a predetermined reference value.

[0047] The method may further include determining that the all-solid-state battery is defective if the pressure distribution standard deviation value is equal to or greater than a predetermined reference value.

[0048] Furthermore, various effects that can be directly or indirectly recognized through the file can be provided.

[0049] As discussed, the methods and systems suitably include the use of a controller or processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 A block diagram representing an example configuration of an all-solid-state battery defect detection system including an all-solid-state battery defect detection apparatus is shown.

[0051] Figure 2 A diagram illustrating example pressure measurement points for detecting defects of an all-solid-state battery is shown.

[0052] Figure 3 An example pressure distribution at each pressure measurement point for detecting defects of an all-solid-state battery is shown.

[0053] Figure 4 Example pressure profiles for each battery SOC are shown.

[0054] Figure 5 A schematic diagram showing an example pressurization of an all-solid-state battery is shown.

[0055] Figure 6 A flow chart representing an example of an all-solid-state battery defect detection method is shown.

[0056] Fig. 7A and Figure 7B Each shows a diagram for explaining an example life of a battery cell when a defect is detected using pressure distribution.

[0057] Figure 8 An example computing system is shown. DETAILED DESCRIPTION

[0058] Hereinafter, some exemplary embodiments of the present disclosure will be described in detail with reference to the exemplary drawings. It should be noted that when adding reference numerals to the constituent elements of each drawing, the same constituent elements, even if indicated on different drawings, have the same reference numerals as much as possible. When describing the exemplary embodiments, when it is determined that the detailed description of the well-known configuration or function associated with the exemplary embodiments may obscure the gist of the present disclosure, the detailed description will be omitted.

[0059] When describing the constituent elements according to the exemplary embodiments, terms such as first, second, A, B, (a) and (b) may be used. These terms are only used to distinguish the constituent elements from other constituent elements, and the nature, order or sequence of the constituent elements are not limited by these terms. In addition, all terms including technical scientific terms used in this article have the same meaning as the meaning commonly understood by the technicians (those skilled in the art) in the technical field to which the exemplary embodiments of the present disclosure belong, unless defined differently. The terms defined in the general dictionary should be interpreted as having a meaning that matches the meaning in the context of the relevant field, and should not be interpreted as having an idealized or overly formal meaning, unless clearly defined in this specification.

[0060] The terms used herein are only used to describe specific embodiments and are not intended to limit the present disclosure. As used herein, the singular forms "one", "an" and "the" are also intended to include plural forms, unless the context clearly states otherwise. These terms are only intended to distinguish one component from another component, and these terms do not limit the nature, order or sequence of the components. It will also be understood that the terms "including" and / or "comprising" when used in this specification specify the existence of the stated features, integers, steps, operations, elements and / or components, but do not exclude the existence or addition of one or more other features, integers, steps, operations, elements, components and / or their groups. As used herein, the term "and / or" includes any one and all combinations of one or more related listed items. Throughout the specification, unless explicitly described to the contrary, the word "including" and variants such as "including" or "comprising" will be understood to imply the inclusion of the stated elements but do not exclude any other elements. In addition, the terms "unit", "-device", "-piece" and "module" described in the specification represent units for processing at least one function and operation, and can be implemented by hardware components or software components and combinations thereof.

[0061] Although the exemplary embodiments are described as using multiple units to perform the exemplary processes, it is understood that the exemplary processes may also be performed by one or more modules. In addition, it is understood that the term controller / control unit refers to a hardware device that includes a memory and a processor and is specifically programmed to run the processes described herein. The memory is configured to store the modules, and the processor is specifically configured to run the modules to perform one or more processes described further below.

[0062] In addition, the control logic of the present disclosure may be implemented as a non-transitory computer-readable medium on a computer-readable medium containing executable program instructions executed by a processor, a controller, etc. Examples of computer-readable media include, but are not limited to, ROM, RAM, compact disk (CD)-ROM, magnetic tape, floppy disk, flash drive, smart card, and optical data storage device. The computer-readable medium may also be distributed in a networked computer system so that the computer-readable medium is stored and executed in a distributed manner, for example, by a telematics server or a controller area network (CAN).

[0063] Unless specifically stated or apparent from the context, as used herein, the term "about" is understood to be within the normal tolerance range in the art, such as within 2 standard deviations of the mean. "About" may be understood to be within 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%, 0.5%, 0.1%, 0.05%, or 0.01% of a specified value. Unless otherwise clear from the context, all numerical values ​​provided herein are modified by the term "about".

[0064] In the following, reference will be made to Figures 1 to 8 Various exemplary embodiments of the present disclosure are described in detail.

[0065] Figure 1 A block diagram representing an example configuration of an all-solid-state battery defect detection system including an all-solid-state battery defect detection apparatus is shown.

[0066] Reference Figure 1 , an all-solid-state battery defect detection system according to an exemplary embodiment of the present disclosure may include an all-solid-state battery defect detection device 100 and a surface pressure sensor 200 .

[0067] The all-solid-state battery defect detection device 100 according to the present disclosure can be formed integrally with the all-solid-state battery, can be implemented as a separate hardware device connected to the all-solid-state battery through a connecting device, or can be implemented as installed and attached to the all-solid-state battery.

[0068] The all-solid-state battery defect detection device 100 can detect defects in the all-solid-state battery by obtaining the pressure distribution of the all-solid-state battery immediately after tightening the pressurizing clamp, at the end of charging of the all-solid-state battery, and at the end of discharging of the all-solid-state battery. In this case, immediately after tightening the pressurizing clamp means that the pressurizing clamp has been tightened but pressure has not yet been applied. The end of charging refers to the time when the charging of the all-solid-state battery begins and the charging is almost completed, and refers to the interval in which the state of charge (SOC) of the all-solid-state battery increases from 50% to 100%. The end of discharge refers to the interval in which the depth of discharge (DOD) of the all-solid-state battery drops from 50% to 0%, which is the time point when the discharge is almost completed.

[0069] The all-solid-state battery defect detection device 100 may include a communication device 110, a storage device 120, an interface device 130, and a processor 140. According to an exemplary embodiment of the present disclosure, the all-solid-state battery defect detection device 100 may be implemented as a single unit by coupling components to each other, and some components may be omitted.

[0070] The communication device 110 may be a hardware device implemented with various electronic circuits to transmit and receive signals through a wireless or wired connection, and may receive a sensing result by communicating with the surface pressure sensor 200 or the like.

[0071] In addition, the communication device 110 can communicate with an external server through mobile communication technology, wireless Internet access or short-range communication technology, and send the defect detection results of the all-solid-state battery as the results of the pressure distribution of the all-solid-state battery to the external server, etc.

[0072] Here, wireless Internet communication may include wireless LAN (WLAN), wireless fidelity (Wi-Fi), Wi-Fi direct, Digital Living Network Alliance (DLNA), wireless broadband (WiBro), world interoperability for microwave access (WiMAX), high-speed downlink packet access (HSDPA), high-speed uplink packet access (HSUPA), long-term evolution (LTE), long-term evolution-advanced (LTE-A), etc. In addition, short-range communication technology may include Bluetooth, ZigBee, ultra-wideband (UWB), radio frequency identification (RFID), infrared data communication (IrDA), etc.

[0073] Mobile communication technology may include technical standards for mobile communications, communication methods (for example, Global System for Mobile Communications (GSM), Code Division Multiple Access (CDMA), Code Division Multiple Access 2000 (CDMA 2000), Enhanced Voice Data Optimization or Enhanced Voice Data Only (EV-DO), Wideband CDMA (WCDMA), High Speed ​​Downlink Packet Access (HSDPA), High Speed ​​Uplink Packet Access (HSUPA), Long Term Evolution (LTE), Long Term Evolution-Advanced (LTE-A), fourth generation mobile communications (4G), fifth generation mobile communications (5G)), etc.

[0074] The storage device 120 may store sensing results of the surface pressure sensor 200 and data and / or algorithms required for the operation of the processor 140 .

[0075] As an example, the storage device 120 may store a reference value for comparison with the standard deviation of the pressure distribution. The reference value may be predetermined based on experimental values ​​and stored.

[0076] The storage device 120 may include at least one type of storage medium such as a flash memory, a hard disk, a micro memory (micro), a card (e.g., a secure digital (SD) card or an extreme digital (XD) card), a random access memory (RAM), a static RAM (SRAM), a read-only memory (ROM), a programmable ROM (PROM), an electrically erasable PROM (EEPROM), a magnetic memory (MRAM), a magnetic disk, and an optical disk.

[0077] The interface device 130 may include an input device for receiving a control command from a user and an output device for outputting the operating state and results of the device 100. Here, the input device may include a key, and may include a mouse, a joystick, a jog shuttle, a stylus pen, etc. In addition, the input device may include a soft key implemented on a display.

[0078] The output device may include a display, and may also include a voice output device such as a speaker. In this case, in response to the case where a touch sensor formed by a touch film, a touch sheet, or a touch pad is provided on the display, the display may be operated as a touch screen, and may be implemented in a form in which the input device and the output device are integrated. In the present disclosure, the output device may output defect detection results of an all-solid-state battery, etc.

[0079] In this case, the display may include at least one of a liquid crystal display (LCD), a thin film transistor liquid crystal display (TFTLCD), an organic light emitting diode display (OLED display), a flexible display, a field emission display (FED), a 3D display, or any combination thereof.

[0080] The processor 140 may be electrically connected to the communication device 110 , the storage device 120 , the interface device 130 , etc., may electrically control each component, and may be a circuit that runs software commands to perform various data processing and calculations described below.

[0081] The processor 140 can perform overall control by processing the signals transmitted between each component of the all-solid-state battery defect detection device 100 so that each component can normally perform its function. The processor 140 can be implemented in the form of hardware, software, or a combination of hardware and software. For example, the processor 140 can be implemented as a microprocessor, but the present disclosure is not limited thereto.

[0082] The processor 140 may detect defects of the all-solid-state battery by utilizing pressure distribution measurement of the all-solid-state battery immediately after fastening the pressurizing jig to the all-solid-state battery and at the end of charging and discharging of the all-solid-state battery.

[0083] In order to continuously apply uniform pressure to the all-solid-state battery, the processor 140 may detect defects of the all-solid-state battery by comparing a measured pressure distribution standard deviation value with a predetermined reference value immediately after tightening the pressurizing jig, ie, before starting pressurization.

[0084] That is, the processor 140 can compare the standard deviation value of the pressure distribution measured immediately after the pressurizing clamp is tightened to the all-solid-state battery with a predetermined reference value, and can determine that the all-solid-state battery is defective in response to the situation that the standard deviation value of the pressure distribution measured immediately after the pressurizing clamp is tightened to the all-solid-state battery is equal to or greater than the predetermined reference value.

[0085] The processor 140 may detect a defect of the all-solid-state battery by comparing a pressure distribution standard deviation value measured at the end of charging of the all-solid-state battery with a predetermined reference value.

[0086] That is, the processor 140 can compare the standard deviation value of the pressure distribution measured at the end of charging of the all-solid-state battery with a predetermined reference value, and can determine that the all-solid-state battery is defective in response to the situation that the standard deviation value of the pressure distribution measured at the end of charging of the all-solid-state battery is equal to or greater than the predetermined reference value.

[0087] The processor 140 may detect a defect of the all-solid-state battery by comparing a pressure distribution standard deviation value measured at the end of discharge of the all-solid-state battery with a predetermined reference value.

[0088] That is, the processor 140 can compare the standard deviation value of the pressure distribution measured at the end of discharge of the all-solid-state battery with a predetermined reference value, and can determine that the all-solid-state battery is defective in response to the situation that the standard deviation value of the pressure distribution measured at the end of discharge of the all-solid-state battery is equal to or greater than the predetermined reference value.

[0089] In this case, the end of charging of the all-solid-state battery refers to the state where the charging of the all-solid-state battery begins and the state of charge (SOC) of the all-solid-state battery reaches a predetermined reference value. In addition, the end of discharging of the all-solid-state battery refers to the state where the discharging of the all-solid-state battery begins and the depth of discharge (DOD) reaches a predetermined reference value.

[0090] The processor 140 may determine the predetermined reference value according to the amount of pressure applied to the battery cell of the all-solid-state battery and the size of the battery cell.

[0091] The surface pressure sensor 200 may measure the pressure distribution of the positive electrode or the negative electrode of the all-solid-state battery. The present disclosure discloses an example of measuring the pressure distribution of the positive electrode of the all-solid-state battery, but is not limited thereto.

[0092] To this end, the surface pressure sensor can be disposed on the upper portion of the positive electrode of the all-solid-state battery, and will be referred to later. Figure 5 Describe in detail.

[0093] Thus, according to the present disclosure, the pressure distribution of the all-solid-state battery can be used to detect the defects of the all-solid-state battery. However, the common technique for detecting defects of the all-solid-state battery is to use the open circuit voltage (OCV), and the method for detecting defects of the all-solid-state battery using the open circuit voltage and the method for detecting defects of the all-solid-state battery using the pressure distribution according to the present disclosure can be used in combination to detect defects of the all-solid-state battery, thereby improving the accuracy of defect detection.

[0094] Figure 2 A diagram illustrating example pressure measurement points for detecting defects in an all-solid-state battery is shown, and Figure 3 An example pressure distribution at each pressure measurement point for detecting defects of an all-solid-state battery is shown.

[0095] Reference Figure 2 In the present disclosure, the pressure of the all-solid-state battery can be measured ① immediately after tightening the pressurizing clamp, ② at the end of charging of the all-solid-state battery, and ③ at the end of discharging of the all-solid-state battery.

[0096] In response to the situation where defects of the all-solid-state battery are detected immediately after the pressurization fixture is tightened, defect screening can be performed even without applying current to the battery cell, thereby increasing the hourly shipment of qualified battery cells. In addition, the activation of charging and discharging takes a long time, and the defect detection efficiency can be improved by detecting defects of the all-solid-state battery in advance using the pressure distribution before activation. Therefore, the pressure for detecting defects of the all-solid-state battery is measured immediately after the pressurization fixture is tightened. Figure 3 View 301 shows the pressure distribution of the all-solid-state battery immediately after tightening the pressurizing fixture.

[0097] In addition, at the end of the charge of the all-solid-state battery, the oxidative decomposition of the electrolyte actively occurs at the positive electrode interface, and the reductive decomposition of the electrolyte occurs at the negative electrode interface, so side reactants are produced at each interface. The extent of the reaction varies according to the resistance of the interface, and the pressure distribution caused by the volume contraction and expansion of the places where the main reaction and the side reaction occur is significantly different. Therefore, it is necessary to detect the defects of the all-solid-state battery by measuring the pressure at the end of the charge of the all-solid-state battery. In this case, the main reaction at the end of the charge of the all-solid-state battery can include lithium (Li) from the positive electrode and lithium (Li) from the negative electrode. Figure 3 View 302 discloses the pressure distribution of the all-solid-state battery in response to a SOC of 100, ie, at the end of charging.

[0098] In addition, at the end of discharge of the all-solid-state battery, reduction decomposition of the electrolyte may occur at the positive electrode interface, and oxidation decomposition of the electrolyte may occur at the negative electrode interface, producing side reactants different from those at the end of charge. Similarly, the difference in pressure distribution that was not visible at the end of charge appears significant. In this case, the main reaction at the end of discharge can include lithium (Li) insertion from the positive electrode and lithium (Li) extraction from the negative electrode. Figure 3 View 303 discloses the pressure distribution of the all-solid-state battery in response to a depth of discharge (DOD) of 20, ie, at the end of discharge.

[0099] Figure 4 Example pressure profiles for each battery SOC are shown.

[0100] Reference Figure 4 It can be seen that immediately after the pressurizing fixture is tightened, the physical pressure distribution without electrochemical reaction is shown in view 401. At SOC (0≤x≤50), even if electrochemical reaction occurs, the degree of volume expansion or contraction is relatively not serious. View 402 shows the pressure distribution in response to the case where the SOC is 20.

[0101] At SOC (50 ≤ x ≤ 100), the components constituting the positive electrode may be exposed to a relatively high potential, and the components constituting the negative electrode may be exposed to a relatively low potential. Therefore, electrochemical reactions actively occur within each electrode or at its interface, resulting in volume expansion and contraction, making it easy to determine the pressure distribution.

[0102] In addition, since the volume expansion of the battery cell is the largest when the SOC is 100, the resulting pressure distribution is most easily observed. View 403 shows the pressure distribution in response to the case where the SOC is 100.

[0103] Likewise, even at DOD (0≤y≤50), components constituting the cell are exposed to a relatively low potential state, so electrochemical reactions occurring at low voltages are active, making it easy to determine pressure distribution. Graph 404 shows pressure distribution in response to a DOD of 20.

[0104] The reference value may be variously set according to the magnitude of the force applied to the battery cell of the all-solid-state battery and the size of the battery cell.

[0105] Figure 5 A schematic diagram showing an example pressurization of an all-solid-state battery is shown.

[0106] Reference Figure 5 For the surface pressure sensor, the silicon pad 102 is located on the pressurizing fixture 101, and the all-solid-state battery is positioned by stacking the negative electrode 103, the solid electrolyte 104 and the positive electrode 105 in sequence on the silicon pad 102, the surface pressure sensor 106 is located on the upper part of the all-solid-state battery, the silicon pad 107 is located on the surface pressure sensor 106, the pressurizing fixture 108 is located on the upper part of the silicon pad 107, and bolts 109 for fastening the pressurizing fixtures 101 and 108 are formed. Figure 5 A state in which the press jigs 101 and 108 are fastened to the all-solid-state battery is shown.

[0107] In the following, reference will be made to Figure 6 An all-solid-state battery defect detection method according to an exemplary embodiment of the present disclosure is described. Figure 6 A flow chart representing an example of an all-solid-state battery defect detection method is shown.

[0108] In the following, it is assumed Figure 1 The all-solid-state battery defect detection device 100 performs Figure 6 In addition, Figure 6 In the description of , the operations described as being performed by the device can be understood as being controlled by the processor 140 of the all-solid-state battery defect detection device 100. In the following exemplary embodiments, the operations of steps S101 to S110 can be performed sequentially, but not necessarily sequentially. For example, the order of each operation can be changed, and at least two operations can be performed in parallel.

[0109] Reference Figure 6 Immediately after fastening the pressurizing fixtures 101 and 108 to the all-solid-state battery, the all-solid-state battery defect detection device 100 measures the pressure distribution of the positive electrode of the all-solid-state battery by utilizing the surface pressure sensor 106 (S101).

[0110] Therefore, the all-solid-state battery defect detection apparatus 100 can determine the standard deviation of the pressure distribution immediately after tightening the pressurizing jigs 101 and 108. In this case, the all-solid-state battery may include a plurality of battery cells, and the all-solid-state battery defect detection apparatus 100 can determine the standard deviation of the pressure distribution immediately after tightening the pressurizing jigs 101 and 108 of a predetermined number (e.g., 50) of battery cells by acquiring the pressure distribution immediately after tightening the pressurizing jigs 101 and 108 of a predetermined number (e.g., 50) of battery cells.

[0111] The all-solid-state battery defect detection device 100 may determine whether the standard deviation of the pressure distribution immediately after tightening the pressurizing jigs 101 and 108 is less than a predetermined reference value (S102). In this case, the reference value may be predetermined by an experimental value to be stored in the storage device 120.

[0112] In response to the standard deviation of the pressure distribution immediately after tightening the pressurizing clamps 101 and 108 being equal to or greater than a predetermined reference value, the all-solid-state battery defect detection device 100 can determine that the corresponding battery cells (e.g., 50 battery cells involving the standard deviation) are defective (S103).

[0113] On the other hand, in response to the situation that the standard deviation of the pressure distribution immediately after tightening the pressurizing clamps 101 and 108 is less than a predetermined reference value, the all-solid-state battery defect detection device 100 can determine that the corresponding battery cells (for example, 50 battery cells involving the standard deviation) are normal (S104).

[0114] Next, the all-solid-state battery defect detection device 100 can measure the pressure distribution and determine the standard deviation of the pressure distribution by using the surface pressure sensor 106 at the end of charging after charging the all-solid-state battery to an SOC of the all-solid-state battery of x (S105).

[0115] The all-solid-state battery defect detection apparatus 100 may determine whether a standard deviation of pressure distribution measured after charging the all-solid-state battery to an SOC of the all-solid-state battery of x is less than a predetermined reference value ( S106 ).

[0116] Therefore, the all-solid-state battery defect detection device 100 can determine that the all-solid-state battery is normal (S107) in response to the situation that the standard deviation of the pressure distribution measured after the all-solid-state battery is charged to the SOC of the all-solid-state battery is x (50≤x≤100) is less than a predetermined reference value, and can determine that the all-solid-state battery is defective (S103) in response to the situation that the standard deviation of the pressure distribution measured after the all-solid-state battery is charged to the SOC of the all-solid-state battery is x is equal to or greater than a predetermined reference value.

[0117] Next, the all-solid-state battery defect detection device 100 can measure the pressure distribution of the all-solid-state battery after discharging the all-solid-state battery until the DOD of the all-solid-state battery is y (0≤y≤50) to determine the standard deviation of the pressure distribution (S108).

[0118] The all-solid-state battery defect detection apparatus 100 may determine whether a pressure distribution standard deviation value measured after discharging the all-solid-state battery until the DOD of the all-solid-state battery is y (0≤y≤50) is less than a predetermined reference value ( S109 ).

[0119] Therefore, the all-solid-state battery defect detection device 100 can determine that the all-solid-state battery is normal (S110) in response to the situation that the standard deviation of the pressure distribution measured after the all-solid-state battery is discharged to the DOD of the all-solid-state battery is y (0≤y≤50) is less than a predetermined reference value, and can determine that the all-solid-state battery is defective (S103) in response to the situation that the standard deviation of the pressure distribution measured after the all-solid-state battery is discharged to the DOD of the all-solid-state battery is y (0≤y≤50) is equal to or greater than a predetermined reference value.

[0120] In this way, according to the present disclosure, the accuracy of detecting defects in the all-solid-state battery can be improved by measuring the pressure distribution of the all-solid-state battery three times, immediately after tightening the pressurizing clamp, at the end of charging, and at the end of discharging, to detect defects in the all-solid-state battery.

[0121] Fig. 7A and Figure 7B Each shows a diagram for explaining an example life of a battery cell when a defect is detected using pressure distribution.

[0122] Fig. 7A The retention rate for each cycle number is shown. It can be seen that the initial retention rate of the battery cells that passed the defect screening, i.e., the normal battery cells, rarely drops from 100. However, it can be seen that Figure 2 The retention rate of the battery cells detected as defective in the interval ①, Figure 2 The retention rate of the battery cells detected as defective in the interval ② and Figure 2The retention rate of the battery cells detected as defective in the interval ③ of decreases to 80% as the number of cycles increases. This decrease in the retention rate indicates that the life of the battery cells is shortened.

[0123] Figure 7B The Coulombic efficiency for each cycle number is shown. It can be seen that the initial Coulombic efficiency of the battery cells that passed the defect screening, i.e., the normal battery cells, rarely drops from 100. However, it can be seen that Figure 2 The coulombic efficiency of the battery cell detected as defective in the interval ①, Figure 2 The Coulombic efficiency of the battery cells detected as defective in the interval ② and Figure 2 The coulombic efficiency of the battery cell detected as defective in the interval ③ decreases as the number of cycles increases. This decrease in coulombic efficiency indicates that the life of the battery cell is shortened.

[0124] Figure 8 An example computing system is shown.

[0125] Reference Figure 8 The computing system 1000 includes at least one processor 1100 , a memory 1300 , a user interface input device 1400 , a user interface output device 1500 , a storage device 1600 , and a network interface 1700 connected via a bus 1200 .

[0126] The processor 1100 may be a central processing unit (CPU) or a semiconductor device that performs processing on commands stored in the memory 1300 and / or the storage device 1600. The memory 1300 and the storage device 1600 may include various types of volatile or non-volatile storage media. For example, the memory 1300 may include a read-only memory (ROM) 1310 and a random access memory (RAM) 1320.

[0127] Therefore, the steps of the method or algorithm described in conjunction with the exemplary embodiments disclosed herein may be implemented directly by hardware, software modules, or a combination of the two executed by the processor 1100. The software module may reside in a storage medium (i.e., memory 1300 and / or storage device 1600) such as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, and a CD-ROM.

[0128] An exemplary storage medium is coupled to the processor 1100, and the processor 1100 can read information from the storage medium and write information to the storage medium. Alternatively, the storage medium can be integrated with the processor 1100. The processor and the storage medium can reside in an application specific integrated circuit (ASIC). The ASIC can reside in a user terminal. Alternatively, the processor and the storage medium can reside in a user terminal as separate components.

[0129] The above description is merely an illustration of the technical idea of ​​the present disclosure, and those skilled in the art to which the present disclosure belongs may make various modifications and variations without departing from the essential features of the present disclosure.

[0130] Therefore, the exemplary embodiments disclosed in the present disclosure are not intended to limit the technical ideas of the present disclosure, but to explain the technical ideas of the present disclosure, and the scope of the technical ideas of the present disclosure is not limited by these exemplary embodiments. The protection scope of the present disclosure should be interpreted by the attached claims, and all technical ideas within the equivalent scope should be interpreted as included in the scope of the present disclosure.

Claims

1. An all-solid-state battery defect detection device, comprising: a processor that detects a defect of the all-solid-state battery by utilizing pressure distribution measurement of the all-solid-state battery at the end of charge and discharge of the all-solid-state battery immediately after fastening a pressurizing jig to the all-solid-state battery; as well as A storage device stores data and algorithms driven by the processor.

2. The all-solid-state battery defect detection device according to claim 1, wherein: The processor detects a defect of the all-solid-state battery by comparing a pressure distribution standard deviation value measured immediately after the pressurizing jig is fastened to the all-solid-state battery with a predetermined reference value.

3. The all-solid-state battery defect detection device according to claim 1, wherein: The processor detects a defect of the all-solid-state battery by comparing a standard deviation value of pressure distribution measured at the end of charging of the all-solid-state battery with a predetermined reference value.

4. The all-solid-state battery defect detection device according to claim 1, wherein: The end of charging of the all-solid-state battery refers to a state where charging of the all-solid-state battery begins and the state of charge of the all-solid-state battery, that is, the SOC, reaches a predetermined reference value.

5. The all-solid-state battery defect detection device according to claim 1, wherein: The processor detects a defect of the all-solid-state battery by comparing a standard deviation value of pressure distribution measured at the end of discharge of the all-solid-state battery with a predetermined reference value.

6. The all-solid-state battery defect detection device according to claim 1, wherein: The end of discharge of the all-solid-state battery refers to a state where discharge of the all-solid-state battery begins and the depth of discharge, i.e., DOD, reaches a predetermined reference value.

7. The all-solid-state battery defect detection device according to claim 2, wherein: The processor determines the predetermined reference value according to an amount of pressure applied to a battery cell of the all-solid-state battery and a size of the battery cell.

8. An all-solid-state battery defect detection system, comprising: Surface pressure sensor to measure pressure distribution in all-solid-state batteries; as well as An all-solid-state battery defect detection device detects defects of the all-solid-state battery by utilizing the pressure distribution measurement of the all-solid-state battery measured by the surface pressure sensor immediately after the pressurizing clamp is fastened to the all-solid-state battery and at the end of the charging and discharging of the all-solid-state battery.

9. The all-solid-state battery defect detection system according to claim 8, wherein: The surface pressure sensor measures the pressure distribution of the positive electrode of the all-solid-state battery.

10. The all-solid-state battery defect detection system according to claim 8, wherein: The surface pressure sensor is disposed between the pressurizing fixture and the all-solid-state battery.

11. The all-solid-state battery defect detection system according to claim 8, wherein: The all-solid-state battery defect detection device detects defects of the all-solid-state battery by comparing a pressure distribution standard deviation value measured immediately after the pressurizing jig is fastened to the all-solid-state battery with a predetermined reference value.

12. The all-solid-state battery defect detection system according to claim 8, wherein: The all-solid-state battery defect detection device detects defects of the all-solid-state battery by comparing a pressure distribution standard deviation value measured at the end of charging of the all-solid-state battery with a predetermined reference value.

13. The all-solid-state battery defect detection system according to claim 8, wherein: The all-solid-state battery defect detection device detects defects of the all-solid-state battery by comparing a pressure distribution standard deviation value measured at the end of discharge of the all-solid-state battery with a predetermined reference value.

14. A method for detecting defects in an all-solid-state battery, comprising: detecting defects of the all-solid-state battery using pressure distribution measurement of the all-solid-state battery immediately after fastening a pressurizing jig to the all-solid-state battery; Detecting defects of the all-solid-state battery using pressure distribution measurement of the all-solid-state battery at the end of charging of the all-solid-state battery; as well as Defects of the all-solid-state battery are detected using pressure distribution measurement of the all-solid-state battery at the end of discharge of the all-solid-state battery.

15. The all-solid-state battery defect detection method according to claim 14, wherein: Detecting defects of the all-solid-state battery using pressure distribution measurement of the all-solid-state battery immediately after fastening a pressurizing jig to the all-solid-state battery includes: comparing a pressure distribution standard deviation value measured immediately after the pressurizing jig is fastened to the all-solid-state battery with a predetermined reference value; and In response to a case where the pressure distribution standard deviation value measured immediately after the pressurizing jig is fastened to the all-solid-state battery is equal to or greater than the predetermined reference value, it is determined that the all-solid-state battery is defective.

16. The all-solid-state battery defect detection method according to claim 14, wherein: Detecting defects of the all-solid-state battery by measuring the pressure distribution of the all-solid-state battery at the end of charging of the all-solid-state battery includes: comparing a pressure distribution standard deviation value measured at the end of charging of the all-solid-state battery with a predetermined reference value; and In response to a situation where the pressure distribution standard deviation value measured at the end of charging of the all-solid-state battery is equal to or greater than the predetermined reference value, it is determined that the all-solid-state battery is defective.

17. The all-solid-state battery defect detection method according to claim 14, wherein: Detecting defects of the all-solid-state battery by measuring the pressure distribution of the all-solid-state battery at the end of discharge of the all-solid-state battery includes: comparing a pressure distribution standard deviation value measured at the end of discharge of the all-solid-state battery with a predetermined reference value; and In response to a situation where the pressure distribution standard deviation value measured at the end of discharge of the all-solid-state battery is equal to or greater than the predetermined reference value, it is determined that the all-solid-state battery is defective.

18. The all-solid-state battery defect detection method according to claim 14, wherein: The end of charging of the all-solid-state battery refers to a state where charging of the all-solid-state battery begins and the state of charge of the all-solid-state battery, that is, the SOC, reaches a predetermined reference value.

19. The all-solid-state battery defect detection method according to claim 14, wherein: The end of discharge of the all-solid-state battery refers to a state where discharge of the all-solid-state battery begins and the depth of discharge, i.e., DOD, reaches a predetermined reference value.

20. The all-solid-state battery defect detection method according to claim 15, further comprising: The predetermined reference value is determined according to an amount of pressure applied to a battery cell of the all-solid-state battery and a size of the battery cell.

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