Method and equipment for testing high-voltage insulation of solid-state battery

Abstract

The invention provides a solid-state battery high-voltage insulation test method and test equipment thereof. The solid-state battery high-voltage insulation test method provided by the invention comprises the steps that pole pieces and solid-state electrolyte layers are alternately stacked to form a lamination assembly to be tested, the polarities of any two adjacent pole pieces are opposite, and the pole pieces are insulated; respectively connecting the two pole pieces on the outermost side in the lamination assembly with the positive pole and the negative pole of an external high-voltage power supply; inputting a voltage signal to the two pole pieces on the outermost side in the lamination assembly; obtaining the actual leakage current of the lamination assembly; and comparing the actual leakage current with a preset leakage current threshold value, and judging whether a short circuit occurs in the lamination assembly or not according to a comparison result. The solid-state battery high-voltage insulation test method provided by the invention can effectively reduce the possibility of production cost increase and material waste in the battery monomer production process.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery manufacturing, in particular to a solid-state battery high-voltage insulation test method and test equipment thereof. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy-saving and environmentally friendly advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] In the existing solid-state battery manufacturing process, the completed solid-state battery has the problem of internal electrode assembly short circuit and cannot pass the test. The solid-state battery that cannot pass the test needs to be scrapped, which increases the production cost and causes material waste. Therefore, how to reduce the possibility of solid-state battery scrapping due to short circuit of the completed solid-state battery has become a problem to be solved. SUMMARY

[0004] In view of the above problems, the present application provides a solid-state battery high-voltage insulation test method and test equipment, which can effectively reduce the possibility of increasing production cost and causing material waste in the production process of the battery monomer.

[0005] In a first aspect, the present application provides a solid-state battery high-voltage insulation test method, which comprises:

[0006] Alternately stacking the pole piece and the solid-state electrolyte layer to form a stack assembly to be tested, the polarity of any two adjacent pole pieces being opposite, and each pole piece being insulated;

[0007] Connecting the outermost two pole pieces in the stack assembly to the positive and negative poles of an external high-voltage power supply, respectively;

[0008] Inputting a voltage signal to the outermost two pole pieces in the stack assembly;

[0009] Obtaining the actual leakage current of the stack assembly;

[0010] Comparing the actual leakage current with a predetermined leakage current threshold, and determining whether a short circuit occurs in the stack assembly according to the comparison result.

[0011] In the solid-state battery high-voltage insulation testing method of this application embodiment, the stacked assembly to be tested includes mutually insulated electrodes, so that a high-voltage signal can be applied to the stacked assembly using a high-voltage power supply. The actual leakage current generated by the stacked assembly with an internal short circuit is different from that of the stacked assembly without an internal short circuit. By obtaining the actual leakage current of the stacked assembly and comparing the actual leakage current with a predetermined leakage current threshold, it is possible to accurately determine whether a short circuit has occurred inside the stacked assembly to be tested. If a short circuit is detected inside the stacked assembly, the stacked assembly can be scrapped, and thus will not be used to process electrode assemblies. The solid-state battery high-voltage insulation testing method of this application embodiment can perform insulation testing on the insulation performance between electrodes before the electrode assembly is processed and formed, so as to determine whether a short circuit has occurred between the electrodes before the electrode assembly is processed and formed, thereby effectively reducing the possibility of increased production costs and material waste during the production of individual battery cells.

[0012] In some feasible ways, the two outermost electrodes of the laminated assembly have the same polarity, and the two outermost electrodes of the laminated assembly are either positive or negative electrodes.

[0013] The two outermost electrodes of the same polarity are used for electrical connection to the positive and negative terminals of the high-voltage power supply, respectively. Due to the insulation between the electrodes, there is virtually no ion conduction between the electrodes and the solid electrolyte when a high voltage is applied to the stacked assembly. This effectively reduces the possibility of electrochemical reactions occurring between the electrodes and the solid electrolyte due to high voltage input during testing, and consequently reduces the likelihood of electrochemical reactions affecting the electrical performance of the battery cell, including both the electrodes and the solid electrolyte.

[0014] Furthermore, if a high voltage is applied to the laminated assembly, and ions can conduct between the electrodes and the solid electrolyte, this ion conduction process will also generate leakage current, resulting in leakage current test noise. This affects the reliability of the test results, and consequently, a laminated assembly that is not internally short-circuited may be misjudged as having an internal short circuit due to its large leakage current, causing a qualified laminated assembly to be wrongly judged as unqualified. Leakage current test noise is significantly affected by fluctuations in the ionic conductivity of the laminated assembly. Therefore, in this embodiment, the insulation arrangement between the electrodes can effectively reduce the ionic conductivity of the laminated assembly, thereby reducing the possibility of leakage current test noise and improving the reliability of the test results.

[0015] In some feasible implementations, the electrode includes tabs, the tabs of any two adjacent electrodes are staggered, the tabs are insulated from each other, and the tabs of the two outermost electrodes in the laminate assembly are respectively connected to the positive and negative terminals of an external high-voltage power supply.

[0016] The electrode tabs do not have an active material layer, and the tabs are usually in a state where the solid electrolytic layer extends outwards. This makes it easy for the electrode to be electrically connected to the positive or negative terminal of the high-voltage power supply outside the tabs, which helps to reduce the difficulty of connecting the electrode to the high-voltage power supply.

[0017] In some feasible ways, a predetermined compressive stress is applied to the laminate assembly in the thickness direction of the laminate assembly.

[0018] When the electrode and solid electrolyte layer are stacked, applying compressive stress to the electrode and solid electrolyte layer can make the contact between each layer of the electrode and solid electrolyte layer very tight.

[0019] If there are minute gaps between the electrodes and the solid electrolyte layer, these gaps can affect the actual equivalent resistance of the laminated module, potentially leading to deviations in the reliability of insulation test results. Applying a predetermined compressive stress to the laminated module can effectively reduce the likelihood of this problem.

[0020] In some feasible embodiments, a pressure loading assembly is provided, comprising an upper pressure plate and a lower pressure plate, wherein the laminate assembly is disposed between the upper and lower pressure plates, and the upper and lower pressure plates apply a predetermined compressive stress to the laminate assembly in the thickness direction of the laminate assembly.

[0021] The upper and lower pressure plates can simultaneously compress the laminated assembly from both sides. Each pressure plate has a flat surface, ensuring uniform stress on the laminated assembly and reducing the possibility of internal cracks due to uneven stress.

[0022] During the production of electrode assemblies, after the electrode sheets and solid electrolyte layers are stacked, a pressing process is required to ensure tight contact between the layers of the electrode sheets and solid electrolyte layers, thereby ensuring good electrical performance of the electrode assembly. In the high-voltage insulation testing method for solid-state batteries of this application embodiment, when the stacked assembly passes the insulation test, the upper and lower pressure plates can simultaneously complete the pressing process on the stacked assembly. Therefore, the high-voltage insulation testing method for solid-state batteries of this application embodiment can perform the insulation testing and pressing processes on the stacked assembly simultaneously, thus avoiding additional processing steps and improving processing efficiency.

[0023] In some feasible ways, the stacked assembly is placed in a low-temperature environment, which is used to reduce the ionic conductivity of the stacked assembly.

[0024] When the stacked module is in a predetermined low-temperature environment, it is not easy for ions to conduct between the electrode and the solid electrolyte, thus making it difficult for electrochemical reactions to occur between the electrode and the solid electrolyte. This effectively reduces the possibility of electrochemical reactions between the electrode and the solid electrolyte caused by high voltage input during testing, thereby reducing the possibility of the electrical performance of the battery cell, including the electrode and the solid electrolyte, being affected by electrochemical reactions between the electrode and the solid electrolyte.

[0025] Furthermore, if the electrodes and solid electrolyte can conduct ions, this ion conduction process will also generate leakage current, resulting in leakage current test noise. This affects the reliability of the test results, and consequently, a laminated assembly that has not experienced an internal short circuit may be misjudged as having an internal short circuit due to its large leakage current, causing a qualified laminated assembly to be judged as unqualified. Therefore, in this embodiment, placing the laminated assembly in a low-temperature environment can effectively reduce the ionic conductivity of the laminated assembly, thereby reducing the possibility of generating leakage current test noise and improving the reliability of the test results.

[0026] In some feasible ways, the temperature of the low-temperature environment is less than or equal to -30 degrees Celsius.

[0027] Using a low-temperature environment with a temperature of -30 degrees Celsius or less can effectively reduce the ionic conductivity in the laminated module, effectively reduce the leakage current test noise caused by the conduction of ions in the laminated module under test, so as to ensure that the actual leakage current of the laminated module has good reliability, thereby improving the reliability of the insulation test results.

[0028] In some feasible methods, an isolator is provided, which has a sealed insulation cavity, into which the laminated assembly is placed, and into which refrigerant is introduced or a heat exchanger is used to cool the sealed insulation cavity to create a low-temperature environment within the sealed insulation cavity.

[0029] Insulators isolate the laminated assemblies from the external environment. They create a low-temperature environment around the assemblies and prevent heat transfer from the outside to the assemblies, thus accelerating the rate of temperature decrease and shortening insulation testing time. Once the temperature within the sealed insulation chamber reaches the required low temperature for testing, the insulator can maintain this temperature for an extended period, reducing the potential adverse effects of temperature fluctuations on the insulation testing process.

[0030] In some feasible embodiments, a pressure loading assembly is provided, which includes a refrigerant circulation pipe, an upper pressure plate, and a lower pressure plate. Both the upper and lower pressure plates are provided with refrigerant circulation pipes. The laminated assembly is positioned between the upper and lower pressure plates. In the thickness direction of the laminated assembly, the upper and lower pressure plates apply a predetermined compressive stress to the laminated assembly. The refrigerant circulation pipes cool the environment around the laminated assembly to create a low-temperature environment around the laminated assembly.

[0031] The pressure loading component can press the stacked module under test using an upper pressure plate and a lower pressure plate, while simultaneously using a refrigerant circulation pipeline to cool the stacked module under test. Therefore, the solid-state battery high-voltage insulation testing method of this application embodiment can simultaneously perform the cooling process, insulation testing process, and pressing process on the stacked module, thereby avoiding additional processing steps and improving processing efficiency.

[0032] In some feasible methods, after determining that no short circuit has occurred within the laminated assembly, the electrodes of the same polarity in the laminated assembly are electrically connected to form an electrode assembly. Therefore, the electrode assembly undergoes insulation testing before being used to form a battery cell, effectively reducing the possibility of increased production costs and material waste during battery cell manufacturing.

[0033] Secondly, embodiments of this application provide a high-voltage insulation testing device for solid-state batteries, which includes a processing device, a high-voltage testing device, a leakage current detection device, and a short-circuit judgment device.

[0034] The processing device is used to alternately stack electrode sheets and solid electrolyte layers to form a stacked assembly, wherein the polarities of any two adjacent electrode sheets are opposite, and the electrode sheets are insulated from each other.

[0035] The high-voltage testing device is used to connect the two outermost electrodes of the laminated assembly to the positive and negative terminals of the high-voltage power supply, respectively. The high-voltage testing device is also used to input voltage signals to the two outermost electrodes of the laminated assembly.

[0036] Leakage current detection devices are used to obtain the actual leakage current of the laminated assembly;

[0037] The short-circuit detection device is used to compare the actual leakage current with a predetermined leakage current threshold, and to determine whether a short circuit has occurred in the laminated assembly based on the comparison result. Attached Figure Description

[0038] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0039] Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application;

[0040] Figure 2 This is a schematic diagram of the structure of a battery provided in one embodiment of this application;

[0041] Figure 3 This is a schematic diagram of the structure of a battery module provided in one embodiment of the application;

[0042] Figure 4 This is an exploded structural diagram of a battery cell provided in an embodiment of this application;

[0043] Figure 5 This is a schematic flowchart of a high-voltage insulation test method for solid-state batteries provided in an embodiment of this application;

[0044] Figure 6 This is a partial structural diagram of a laminated assembly connected to a high-voltage power supply according to an embodiment of this application;

[0045] Figure 7 This is a partial structural schematic diagram of a stacked assembly provided in an embodiment of this application;

[0046] Figure 8 This is a partial structural schematic diagram of a pressure loading component applying compressive stress to a laminated assembly according to an embodiment of this application;

[0047] Figure 9 This is a partial structural schematic diagram of an embodiment of the present application providing an isolation stack assembly using an isolation element;

[0048] Figure 10 This is a partial structural schematic diagram of an embodiment of the present application providing an isolation stack assembly using an isolation element;

[0049] Figure 11 This is a partial structural schematic diagram of a refrigerant circulation pipeline used to cool the laminated assembly according to an embodiment of this application.

[0050] Explanation of reference numerals in the attached figures:

[0051] 1. Vehicle; 10. Battery; 11. Controller; 12. Motor;

[0052] 20. Battery module;

[0053] 30. Battery cell;

[0054] 40. End cap; 41. Electrode terminal;

[0055] 50. Shell;

[0056] 60. Electrode assembly;

[0057] 70. Stacked assembly; 71. Electrode; 711. Tab; 72. Solid electrolyte layer;

[0058] 80. Pressure loading assembly; 81. Upper pressure plate; 82. Lower pressure plate; 83. Refrigerant circulation piping;

[0059] 90. Isolation component; 91. Sealed heat-insulating cavity;

[0060] 100. Box body; 101. First box body section; 102. Second box body section;

[0061] 110. Heat exchanger; 111. Compressor; 112. Evaporator; 113. Condenser;

[0062] 200. High-voltage power supply;

[0063] 300. Leakage current detection device;

[0064] Z, thickness direction. Detailed Implementation

[0065] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0066] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0067] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0068] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0069] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0070] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0071] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0072] In this application, the battery cell may include a lithium-ion secondary battery cell or a lithium-ion primary battery cell, etc., and the embodiments of this application are not limited thereto. The battery cell may be flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0073] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or battery pack. A battery generally includes a housing for encapsulating one or more battery cells. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0074] A single battery cell includes an electrode assembly. The electrode assembly includes a positive electrode and a negative electrode. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode plates.

[0075] The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector includes a positive current collection section and a positive electrode tab connected to the current collection section. The positive current collection section is coated with the positive active material layer. The positive electrode tab is not coated with the positive active material layer. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum. The positive active material layer includes the positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0076] The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector includes a negative electrode current collection section and a negative electrode tab connected to the negative electrode current collection section. The negative electrode current collection section is coated with the negative electrode active material layer. The negative electrode tab is not coated with the negative electrode active material layer. The material of the negative electrode current collector can be copper. The negative electrode active material layer includes the negative electrode active material. The negative electrode active material can be carbon or silicon, etc.

[0077] Electrode assemblies are the components in a battery cell where electrochemical reactions occur. Electrode assemblies are primarily formed by stacking positive and negative electrode plates, and typically an interlayer dielectric layer is provided between the positive and negative electrode plates. The interlayer dielectric layer may include a solid electrolyte layer. When the electrode assembly formed by stacking the positive electrode plate, solid electrolyte layer, and negative electrode plate is applied to a battery cell, the battery cell is a solid-state battery, thus eliminating the need for liquid electrolyte filling within the battery cell. Exemplarily, the solid electrolyte layer may be a sulfide-based solid electrolyte, an oxide-based solid electrolyte, or a polymer-based solid electrolyte.

[0078] For example, the portions of the positive and negative electrode plates containing active material constitute the main body of the electrode assembly. The portions of the positive and negative electrode plates without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or at opposite ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0079] In a stacked state of positive electrode, solid electrolyte layer and negative electrode, the positive electrode, solid electrolyte layer and negative electrode are pressed to ensure tight contact between each layer of positive electrode, solid electrolyte layer and negative electrode.

[0080] The inventors noted that there is a possibility of short circuits occurring between the positive and negative electrodes in the assembled battery cells. In the event of a short circuit between the positive and negative electrodes, the battery cell may experience thermal runaway. Therefore, insulation testing is required on the assembled battery cells to determine whether a short circuit has occurred between the positive and negative electrodes. However, if an assembled battery cell fails the test due to a short circuit in its internal electrode components, the failed battery cell must be scrapped, leading to increased production costs and material waste.

[0081] To reduce the potential for increased production costs and material waste during battery cell manufacturing, the applicant has discovered that insulation testing can be performed on the insulation performance between electrodes before the electrode assembly is formed, thus determining whether a short circuit has occurred between the electrodes before the electrode assembly is formed. The solid-state battery high-voltage insulation testing method of this application can effectively reduce the potential for increased production costs and material waste during battery cell manufacturing.

[0082] The technical solutions described in the embodiments of this application are applicable to batteries and electrical devices that use batteries.

[0083] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. This application does not impose any special limitations on the above-mentioned electrical devices.

[0084] It should be understood that the technical solutions described in the embodiments of this application are not limited to the batteries and electrical devices described above, but can also be applied to all batteries including housings and electrical devices using batteries. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0085] Figure 1 The structure of vehicle 1 provided in some embodiments of this application is illustrated schematically. See also Figure 1As shown, vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 10 is installed inside vehicle 1. The battery 10 can be located at the bottom, front, or rear of vehicle 1. The battery 10 can be used to power vehicle 1. For example, the battery 10 can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 11 and a motor 12. The controller 11 is used to control the battery 10 to supply power to the motor 12. For example, this is for the power needs of vehicle 1 during starting, navigation, and driving.

[0086] In some embodiments of this application, the battery 10 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1.

[0087] To meet different power demands, battery 10 may include multiple battery cells. A battery cell is the smallest unit that makes up a battery module or battery pack. Multiple battery cells can be connected in series and / or in parallel via electrode terminals for various applications. The battery mentioned in this application includes battery modules or battery packs. Multiple battery cells can be connected in series, parallel, or a combination thereof. A combination thereof refers to a mix of series and parallel connections. In the embodiments of this application, multiple battery cells can be directly assembled into a battery pack, or they can first be assembled into battery modules, and then the battery modules can be assembled into a battery pack.

[0088] Figure 2 The structure of a battery 10 according to an embodiment of this application is schematically shown. See also Figure 2 As shown, the battery includes a housing 100 and individual battery cells (not shown). The individual battery cells are housed within the housing 100.

[0089] The housing 100 can be a simple three-dimensional structure such as a single cuboid, cylinder, or sphere, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres. This application embodiment does not limit this. The material of the housing 100 can be an alloy material such as aluminum alloy or iron alloy, or a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin. This application embodiment also does not limit this.

[0090] The housing 100 is used to accommodate individual battery cells, and the housing 100 can have various structures. In some embodiments, the housing 100 may include a first housing portion 101 and a second housing portion 102. The first housing portion 101 and the second housing portion 102 overlap each other. The first housing portion 101 and the second housing portion 102 together define a receiving space for accommodating the individual battery cells. The second housing portion 102 may be a hollow structure with one open end. In some embodiments, the first housing portion 101 is a plate-like structure. The first housing portion 101 covers the open side of the second housing portion 102 to form a housing 100 with a receiving space. In some embodiments, both the first housing portion 101 and the second housing portion 102 may also be hollow structures with one open side. The open side of the first housing portion 101 covers the open side of the second housing portion 102 to form a housing 100 with a receiving space. Of course, the first housing portion 101 and the second housing portion 102 can be various shapes, such as cylinders, cuboids, etc.

[0091] To improve the sealing performance after the first housing part 101 and the second housing part 102 are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 101 and the second housing part 102.

[0092] In some embodiments, the first housing portion 101 covers the top of the second housing portion 102. The first housing portion 101 may also be referred to as the upper housing cover, and the second housing portion 102 may also be referred to as the lower housing.

[0093] In a battery, there can be one or more individual battery cells. When there are multiple individual battery cells, they can be connected in series, parallel, or a combination thereof. A combination thereof means that multiple individual battery cells are connected in both series and parallel. Multiple individual battery cells can be directly connected in series, parallel, or a combination thereof, and then the entire assembly of the multiple individual battery cells is housed within the housing 100. Of course, multiple individual battery cells can also be first connected in series, parallel, or a combination thereof to form a battery module. Multiple battery modules can then be connected in series, parallel, or a combination thereof to form a whole, which is also housed within the housing 100.

[0094] In some embodiments, Figure 3 The structure of a battery module 20 according to an embodiment of this application is schematically shown. See also Figure 3 As shown, there can be multiple battery cells 30. Multiple battery cells 30 are first connected in series, parallel, or in a mixed manner to form a battery module 20. Multiple battery modules 20 are then connected in series, parallel, or in a mixed manner to form a whole, which is housed within the casing 100.

[0095] Multiple battery cells 30 in the battery module 20 can be electrically connected through a busbar component to achieve parallel, series, or mixed connection of multiple battery cells 30 in the battery module 20.

[0096] In this embodiment, the battery cell 30 may include a lithium-ion battery cell, but this embodiment is not limited thereto. The battery cell 30 may be flat, cuboid, or other shapes, and this embodiment is not limited thereto either. However, for the sake of brevity, the following embodiment uses a cuboid battery cell 30 as an example for illustration.

[0097] Figure 4 The exploded structure of a battery cell 30 provided in some embodiments of this application is schematically shown. See also Figure 4 As shown, battery cell 30 refers to the smallest unit that makes up battery 10. Battery cell 30 may include end cap 40, housing 50 and electrode assembly 60.

[0098] End cap 40 refers to a component that covers the opening of housing 50 to isolate the internal environment of battery cell 30 from the external environment. Exemplarily, the shape of end cap 40 can be adapted to the shape of housing 50 to fit the housing 50. Exemplarily, end cap 40 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that end cap 40 is not easily deformed under pressure or impact, enabling battery cell 30 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 41 can be provided on end cap 40. Electrode terminals 41 can be used for electrical connection with electrode assembly 60 for outputting or inputting electrical energy into battery cell 30.

[0099] In some embodiments, the end cap 40 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 30 reaches a threshold. The end cap 40 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating component may also be provided on the inner side of the end cap 40. The insulating component can be used to isolate the electrical connection components within the housing 50 from the end cap 40 to reduce the risk of short circuits. Exemplarily, the insulating component can be plastic, rubber, etc.

[0100] The housing 50 is a component used to cooperate with the end cap 40 to form the internal environment of the battery cell 30. The formed internal environment can accommodate the electrode assembly 60 and other components. The housing 50 and the end cap 40 can be independent components. An opening can be provided on the housing 50, and the end cap 40 closes the opening to form the internal environment of the battery cell 30. Alternatively, the end cap 40 and the housing 50 can be integrated. Specifically, the end cap 40 and the housing 50 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 50, the end cap 40 closes the housing 50. The housing 50 can have various shapes and sizes, such as a cuboid shape. Specifically, the shape of the housing 50 can be determined according to the specific shape and size of the electrode assembly 60. The material of the housing 50 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment does not impose any special limitations on this.

[0101] Figure 5 A flowchart illustrating the high-voltage insulation test method for solid-state batteries is shown. Figure 6 This schematically illustrates a portion of the structure where the laminated assembly is connected to a high-voltage power supply. See also... Figure 5 and Figure 6 As shown in the figure, this application provides a high-voltage insulation test method for solid-state batteries, which includes:

[0102] The electrode 71 and the solid electrolyte layer 72 are alternately stacked to form the stacked assembly 70 to be tested. The polarities of any two adjacent electrode 71 are opposite, and each electrode 71 is insulated from the others.

[0103] The two outermost electrodes 71 of the laminated assembly 70 are connected to the positive and negative terminals of the external high-voltage power supply 200, respectively.

[0104] A voltage signal is input to the two outermost electrodes 71 of the stacked assembly 70;

[0105] Obtain the actual leakage current of the stacked module 70;

[0106] The actual leakage current is compared with the predetermined leakage current threshold, and the comparison result is used to determine whether a short circuit has occurred in the stacked assembly 70.

[0107] In the stacked assembly 70 to be tested, formed by laminating electrode plates 71 and a solid electrolyte layer 72, each electrode plate 71 is independent and not electrically connected to each other, thus maintaining an insulating state between the electrode plates 71. In the stacked assembly 70, any two adjacent electrode plates 71 are respectively the positive electrode and the negative electrode. A solid electrolyte layer 72 can be disposed between any two adjacent positive and negative electrode plates.

[0108] Along the thickness direction Z of the laminated component 70, the two outermost layer structures in the laminated component 70 are both electrode plates 71. The positive and negative electrodes of the external high-voltage power supply 200 are respectively connected to the two outermost electrode plates 71. Since the electrode plates 71 in the laminated component 70 are insulated from each other, one of the two outermost electrode plates 71 can be connected to the positive electrode of the high-voltage power supply 200, and the other can be connected to the negative electrode of the high-voltage power supply 200, and neither will affect the insulation test results.

[0109] When the high-voltage power supply 200 is in the startup state, the high-voltage power supply 200 inputs voltage signals to the two outermost electrode plates 71. The electrode plate 71 and the solid electrolyte layer 72 each have a predetermined impedance. Since the electrode plates 71 are insulated from each other, the equivalent structure between each electrode plate 71 and each solid electrolyte layer 72 is a series structure. After the voltage signal is input to the laminated component 70, a leakage current will be generated on the laminated component 70.

[0110] The leakage current threshold is used as the judgment criterion for determining whether the laminated component 70 to be tested is short-circuited. If the actual leakage current is greater than the leakage current threshold, it is determined that a short circuit has occurred inside the laminated component 70 to be tested. Correspondingly, if the actual leakage current is less than the leakage current threshold, it is determined that no short circuit has occurred inside the laminated component 70 to be tested. The value of the leakage current threshold is related to the voltage magnitude input by the high-voltage power supply 200. The higher the voltage input by the high-voltage power supply 200, the larger the value of the leakage current threshold. Exemplarily, the voltage value range input by the high-voltage power supply 200 is from 10 volts (V) to 1000 volts. Correspondingly, the value range of the leakage current threshold is from 10 microamperes (μA) to 1 milliampere (mA). For example, when the voltage input by the high-voltage power supply 200 is 10 volts, the leakage current threshold is 10 microamperes. When the actual leakage current of the laminated component 70 obtained is less than 10 microamperes, it is determined that no short circuit has occurred inside the laminated component 70 to be tested. The laminated component 70 is a qualified product. When the actual leakage current of the laminated component 70 obtained is greater than 10 microamperes, it is determined that a short circuit has occurred inside the laminated component 70 to be tested. The laminated component 70 is a non-qualified product.

[0111] For another example, when the voltage input by the high-voltage power supply 200 is 1000 volts, the leakage current threshold can be 1 milliampere. When the actual leakage current of the laminated component 70 obtained is less than 1 milliampere, it is determined that no short circuit has occurred inside the laminated component 70 to be tested. The laminated component 70 is a qualified product. When the actual leakage current of the laminated component 70 obtained is greater than 1 milliampere, it is determined that a short circuit has occurred inside the laminated component 70 to be tested. The laminated component 70 is a non-qualified product.

[0112] The voltage magnitude input by the high-voltage power supply 200 can be selected according to the capacitive reactance of the solid electrolyte layer 72 itself or the distance between two adjacent electrode plates 71. The greater the capacitive reactance of the solid electrolyte layer 72 itself or the greater the distance between two adjacent electrode plates 71, the greater the voltage that can be input by the high-voltage power supply 200.

[0113] Short circuits within the laminated module 70 can occur due to conductive materials such as burrs, metal dust, metal debris, and powder shedding from the active material layer, leading to short circuits between the electrodes 71. When a short circuit occurs in an electrode 71, the equivalent resistance of the laminated module 70 changes, resulting in a larger actual leakage current.

[0114] In the solid-state battery high-voltage insulation testing method of this application embodiment, the stacked assembly 70 to be tested includes mutually insulated electrodes 71, so that a high-voltage signal can be applied to the stacked assembly 70 using a high-voltage power supply 200. The actual leakage current generated by the stacked assembly 70 with an internal short circuit is different from that of the stacked assembly 70 without an internal short circuit. By obtaining the actual leakage current of the stacked assembly 70 and comparing the actual leakage current with a predetermined leakage current threshold, it can be accurately determined whether a short circuit has occurred inside the stacked assembly 70 to be tested. If a short circuit is detected inside the stacked assembly 70, the stacked assembly 70 can be scrapped, and thus will not be used to process the electrode assembly 60. The solid-state battery high-voltage insulation testing method of this application embodiment can perform insulation testing on the insulation performance between the electrodes 71 before the electrode assembly 60 is processed and formed, so as to determine whether a short circuit has occurred between the electrodes 71 before the electrode assembly 60 is processed and formed, thereby effectively reducing the possibility of increased production costs and material waste during the production of the battery cell 30.

[0115] Furthermore, when a high voltage is input to the stacked assembly 70 and an internal short circuit occurs within the stacked assembly 70, each electrode 71 and the solid electrolyte layer 72 can be disassembled. Under the influence of high voltage, the area on the electrode 71 where a short circuit occurs differs visually from other areas, allowing for a preliminary visual assessment of the failure point. Further, appropriate equipment can be used to specifically observe the failure point and analyze the cause of the short circuit, thereby facilitating improvements in the processing technology of the electrode 71 or the solid electrolyte layer 72 and reducing the likelihood of short circuits. Therefore, the high-voltage insulation testing method for solid-state batteries in this application embodiment can accurately locate the failure point.

[0116] In some feasible implementations, the two outermost electrodes 71 of the laminated assembly 70 have the same polarity. Both outermost electrodes 71 of the laminated assembly 70 can be either positive or negative electrodes.

[0117] The two outermost electrodes 71 of the same polarity are used for electrical connection to the positive and negative terminals of the high-voltage power supply 200, respectively. Due to the insulation between the electrodes 71, when a high voltage is applied to the stacked assembly 70, there is virtually no ion conduction between the electrodes 71 and the solid electrolyte. This effectively reduces the possibility of electrochemical reactions occurring between the electrodes 71 and the solid electrolyte due to high voltage input during testing, thereby reducing the likelihood of electrochemical reactions affecting the electrical performance of the battery cell 30, including the electrodes 71 and the solid electrolyte.

[0118] Furthermore, if a high voltage is input to the laminated assembly 70, and ions can conduct between the electrode 71 and the solid electrolyte, this ion conduction process will also generate leakage current, resulting in leakage current test noise. This affects the reliability of the test results, and consequently, a laminated assembly 70 that is not internally short-circuited may be mistakenly judged as having an internal short circuit due to its large leakage current, causing a qualified laminated assembly 70 to be wrongly judged as an unqualified laminated assembly 70. Leakage current test noise is significantly affected by fluctuations in the ionic conductivity of the laminated assembly 70. Therefore, in this embodiment, the insulation arrangement between the individual electrode 71 can effectively reduce the ionic conductivity of the laminated assembly 70, thereby reducing the possibility of leakage current test noise and improving the reliability of the test results.

[0119] In some examples, the number of electrodes 71 in the stacked assembly 70 is N, where N is an odd number greater than or equal to 3. Exemplarily, the number of electrodes 71 in the stacked assembly 70 is three. One of the three electrodes 71 is a positive electrode, and the other two are negative electrodes. The negative electrode, solid electrolyte layer 72, positive electrode, solid electrolyte layer 72, and negative electrode can be sequentially stacked to form the stacked assembly 70 to be tested. A solid electrolyte layer 72 is disposed between the positive electrode active material layer and the negative electrode active material layer. Exemplarily, the number of electrodes 71 in the stacked assembly 70 is three. One of the three electrodes 71 is a negative electrode, and the other two are positive electrodes. The positive electrode, solid electrolyte layer 72, negative electrode, solid electrolyte layer 72, and positive electrode can be sequentially stacked to form the stacked assembly 70 to be tested.

[0120] In this embodiment, when the two outermost electrodes 71 are either two positive electrodes or two negative electrodes of the same polarity, applying a high voltage through the two positive electrodes or two negative electrodes can help reduce the possibility of interfacial reactions between the positive and negative electrodes. It should be noted that interfacial reactions refer to the electrochemical reactions that occur between the electrode 71 and the solid electrolyte layer 72.

[0121] In some feasible ways, Figure 7 A partial structure of the stacked assembly 70 is schematically shown. See also Figure 6 and Figure 7 As shown, electrode 71 includes tabs 711. The tabs 711 of any two adjacent electrodes 71 are staggered. Each tab 711 is insulated from the others. The tabs 711 of the two outermost electrodes 71 in the laminate assembly 70 are respectively connected to the positive and negative terminals of an external high-voltage power supply 200. The current collector of electrode 71 has tabs 711. The external high-voltage power supply 200 can be electrically connected to the current collector.

[0122] The electrode tab 711 of the electrode 71 does not have an active material layer, and the electrode tab 711 is usually in a state of extending the solid electrolytic layer, which makes it easy for the electrode 71 to be electrically connected to the positive or negative terminal of the external high voltage power supply 200 through the electrode tab 711, which helps to reduce the difficulty of electrically connecting the electrode 71 to the high voltage power supply 200.

[0123] In some examples, the positive tabs of the positive electrode and the negative tabs of the negative electrode are staggered, meaning that the orthographic projections of the positive and negative tabs do not overlap in the thickness direction Z of the stacked assembly 70. In some examples, the tabs 711 of the electrodes 71 with the same polarity are arranged correspondingly to each other. Both the number of positive and negative electrodes can be two or more. In the thickness direction Z of the stacked assembly 70, the positive tabs of each positive electrode are arranged correspondingly to each other, meaning that the orthographic projections of the positive tabs overlap in the thickness direction Z of the stacked assembly 70. Correspondingly, in the thickness direction Z of the stacked assembly 70, the negative tabs of each negative electrode are arranged correspondingly to each other, meaning that the orthographic projections of the negative tabs overlap in the thickness direction Z of the stacked assembly 70.

[0124] The arrangement of the tabs 711 of the electrode pieces 71 with the same polarity corresponding to each other makes it easier to stack and weld the tabs 711 with the same polarity after the laminated assembly 70 passes the insulation test, reducing the difficulty of electrical connection between the tabs 711 with the same polarity. After the tabs 711 with the same polarity are electrically connected, the electrode pieces 71 with the same polarity are in parallel structure.

[0125] In some examples, in the stacked assembly 70 under test, the tab 711 is provided with reinforcing ribs or a fixing adhesive is applied to the root of the tab 711, which can improve the positional stability of the tab 711 and help prevent the tab 711 from drooping and making electrical connection with the tab 711 of the same polarity below.

[0126] In some feasible methods, a predetermined compressive stress is applied to the stacked assembly 70 in the thickness direction Z. When the electrode 71 and the solid electrolyte layer 72 are stacked, applying compressive stress to the electrode 71 and the solid electrolyte layer 72 can ensure close contact between the layers of the electrode 71 and the solid electrolyte layer 72.

[0127] If there are minute gaps between the electrode 71 and the solid electrolyte layer 72, these gaps can affect the actual equivalent resistance of the laminated assembly 70, potentially leading to deviations in the reliability of insulation test results. Applying a predetermined compressive stress to the laminated assembly 70 can effectively reduce the likelihood of this problem.

[0128] In some examples, Figure 8 This schematically illustrates a portion of the structure where the pressure loading assembly applies compressive stress to the laminated assembly 70. See also... Figure 8 As shown, the solid-state battery high-voltage insulation test method of this application embodiment further includes: providing a pressure loading assembly 80. The pressure loading assembly 80 includes an upper pressure plate 81 and a lower pressure plate 82. A stacked assembly 70 is disposed between the upper pressure plate 81 and the lower pressure plate 82. In the thickness direction Z of the stacked assembly 70, the upper pressure plate 81 and the lower pressure plate 82 apply a predetermined compressive stress to the stacked assembly 70.

[0129] The upper pressure plate 81 and the lower pressure plate 82 can simultaneously press the stacked assembly 70 from both sides. The upper pressure plate 81 and the lower pressure plate 82 each have a flat surface, which can ensure that the stacked assembly 70 is subjected to uniform force and reduce the possibility of internal cracks caused by uneven force on the stacked assembly 70.

[0130] During the production process of electrode assembly 60, after the electrode sheet 71 and the solid electrolyte layer 72 are stacked, a pressing process is required to ensure tight contact between the layers of the electrode sheet 71 and the solid electrolyte layer 72, thus ensuring that the electrode assembly 60 has good electrical performance. In the high-voltage insulation test method for solid-state batteries of this application embodiment, when the stacked assembly 70 passes the insulation test, the upper pressure plate 81 and the lower pressure plate 82 can simultaneously complete the pressing process on the stacked assembly 70. Therefore, the high-voltage insulation test method for solid-state batteries of this application embodiment can simultaneously perform the insulation test process and the pressing process on the stacked assembly 70, thereby avoiding the increase of processing steps and improving processing efficiency.

[0131] In some feasible ways, the stacked assembly 70 is placed in a low-temperature environment, which is used to reduce the ionic conductivity of the stacked assembly 70.

[0132] When the stacked assembly 70 is in a predetermined low-temperature environment, it is not easy for ions to conduct between the electrode 71 and the solid electrolyte, thereby making it difficult for electrochemical reactions to occur between the electrode 71 and the solid electrolyte. This effectively reduces the possibility of electrochemical reactions occurring between the electrode 71 and the solid electrolyte due to high voltage input during testing, and further reduces the possibility of the electrical performance of the battery cell 30, including the electrode 71 and the solid electrolyte, being affected by electrochemical reactions between the electrode 71 and the solid electrolyte.

[0133] Furthermore, if the electrode 71 and the solid electrolyte can conduct ions, the ion conduction process will also generate leakage current, resulting in leakage current test noise. This affects the reliability of the test results, and consequently, a stacked assembly 70 that is not internally short-circuited may be mistakenly judged as having an internal short circuit due to its large leakage current, causing a qualified stacked assembly 70 to be judged as unqualified. Therefore, in this embodiment, placing the stacked assembly 70 in a low-temperature environment can effectively reduce the ionic conductivity of the stacked assembly 70, thereby reducing the possibility of generating leakage current test noise and improving the reliability of the test results.

[0134] In some examples, the temperature of the cryogenic environment is less than or equal to -30 degrees Celsius (°C). For example, the temperature range of the cryogenic environment can be from -40 degrees Celsius to -100 degrees Celsius. For example, the temperature of the cryogenic environment can be equal to -30 degrees Celsius, -40 degrees Celsius, or -50 degrees Celsius.

[0135] Using a low-temperature environment with a temperature of less than or equal to -30 degrees Celsius can effectively reduce the ionic conductivity in the laminated module 70, effectively reduce the leakage current test noise caused by the conduction of ions in the laminated module 70 under test, so as to ensure that the actual leakage current of the laminated module 70 has good reliability, thereby improving the reliability of the insulation test results.

[0136] In some examples, Figure 9 A partial structure of the laminated assembly 70 isolated using spacers is schematically shown. See also Figure 9 As shown, the solid-state battery high-voltage insulation test method of this application embodiment further includes: providing an insulating member 90. The insulating member 90 has a sealed heat insulation cavity 91. The stacked assembly 70 is placed in the sealed heat insulation cavity 91, and refrigerant is introduced into the sealed heat insulation cavity 91 or a heat exchanger is used to cool the sealed heat insulation cavity 91 to form a low-temperature environment inside the sealed heat insulation cavity 91.

[0137] The isolator 90 isolates the laminated assembly 70 from the external environment. The isolator 90 creates a low-temperature environment around the laminated assembly 70 and prevents external heat from being conducted to the laminated assembly 70, thereby increasing the rate of temperature decrease of the laminated assembly 70 and shortening the insulation test time. After the temperature inside the sealed insulation cavity 91 reaches the low-temperature environment that meets the test requirements, the sealed insulation cavity 91 of the isolator 90 can maintain the current temperature for a long time, reducing the possibility of temperature fluctuations adversely affecting the insulation test process.

[0138] For example, the laminated assembly 70 is placed inside a sealed insulation cavity 91, and a refrigerant is introduced into the sealed insulation cavity 91 to cool it, thereby creating a low-temperature environment inside the sealed insulation cavity 91. The refrigerant can be liquid nitrogen. Liquid nitrogen can rapidly vaporize and absorb heat inside the sealed insulation cavity 91, allowing the sealed insulation cavity 91 to reach the low-temperature environment required for testing within a relatively short time.

[0139] For example, Figure 10 A partial structure of the laminated assembly 70 is schematically shown, using spacer 90 for isolation. See also Figure 10 As shown, the laminated assembly 70 is placed inside a sealed insulation cavity 91, and a heat exchanger 110 is used to cool the sealed insulation cavity 91 to create a low-temperature environment within it. The heat exchanger 110 may include a compressor 111, an evaporator 112, and a condenser 113. The evaporator 112 may be located inside the sealed insulation cavity 91. When the compressor 111, evaporator 112, and condenser 113 operate simultaneously, the evaporator 112 absorbs heat to cool the sealed insulation cavity 91. Using the heat exchanger 110 allows for relatively precise temperature control within the sealed insulation cavity 91, reducing the possibility of temperature fluctuations adversely affecting the insulation testing process.

[0140] In some examples, Figure 11 This schematically illustrates a portion of the structure used for cooling the laminated assembly 70 via a refrigerant circulation system. See also... Figure 11 As shown, the solid-state battery high-voltage insulation test method of this application embodiment further includes: providing a pressure loading assembly 80. The pressure loading assembly 80 includes a refrigerant circulation pipe 83, an upper pressure plate 81, and a lower pressure plate 82. Both the upper pressure plate 81 and the lower pressure plate 82 are provided with refrigerant circulation pipes 83. A stacked assembly 70 is disposed between the upper pressure plate 81 and the lower pressure plate 82. In the thickness direction Z of the stacked assembly 70, the upper pressure plate 81 and the lower pressure plate 82 apply a predetermined compressive stress to the stacked assembly 70. The refrigerant circulation pipe 83 cools the environment around the stacked assembly 70 to form a low-temperature environment around the stacked assembly 70.

[0141] The pressure loading component 80 can press the stacked assembly 70 under test using the upper pressure plate 81 and the lower pressure plate 82, while simultaneously cooling the stacked assembly 70 using the refrigerant circulation pipe 83. Therefore, the solid-state battery high-voltage insulation testing method of this application embodiment can simultaneously perform the cooling process, insulation testing process, and pressing process on the stacked assembly 70, thereby avoiding additional processing steps and improving processing efficiency.

[0142] In some examples, the refrigerant circulation pipe 83 is embedded inside the upper pressure plate 81 or the lower pressure plate 82. The refrigerant circulation pipe 83 is used to transport refrigerant. The refrigerant can be a gaseous or liquid cooling medium. Exemplarily, the refrigerant circulation pipe 83 can be a mesh structure, or it can be a reciprocating bend structure to improve heat exchange efficiency.

[0143] In some feasible methods, after determining that no short circuit has occurred within the stacked assembly 70, the electrodes 71 of the same polarity in the stacked assembly 70 are electrically connected to form the electrode assembly 60. Therefore, the electrode assembly 60 completes insulation testing before being used to form the battery cell 30, thereby effectively reducing the possibility of increased production costs and material waste during the production of the battery cell 30.

[0144] This application also provides a solid-state battery high-voltage insulation testing device, which includes a processing device, a high-voltage testing device, and a leakage current detection device 300 (see [link]). Figure 11 (as shown) and a short-circuit detection device.

[0145] The processing apparatus is used to alternately stack electrode sheets 71 and solid electrolyte layers 72 to form a laminated assembly 70. The polarities of any two adjacent electrode sheets 71 are opposite. The electrode sheets 71 are insulated from each other. A high-voltage testing apparatus is used to connect the two outermost electrode sheets 71 of the laminated assembly 70 to the positive and negative terminals of a high-voltage power supply 200, respectively. The high-voltage testing apparatus is used to input voltage signals to the two outermost electrode sheets 71 of the laminated assembly 70. A leakage current detection apparatus 300 is used to acquire the actual leakage current of the laminated assembly 70. A short-circuit detection apparatus is used to compare the actual leakage current with a predetermined leakage current threshold and determine whether a short circuit has occurred within the laminated assembly 70 based on the comparison result.

[0146] The laminated assembly 70 that passes the insulation test can be further processed to form the electrode assembly 60. Embodiments of this application also provide a battery 10, which includes a battery cell 30. The battery cell 30 includes the electrode assembly 60 formed using the laminated assembly 70 that has passed the insulation test.

[0147] According to some embodiments of this application, this application also provides an electrical device including a battery 10 of any of the above-described embodiments, and the battery 10 is used to provide electrical energy to the electrical device. The electrical device can be any of the aforementioned devices or systems that utilize the battery 10.

[0148] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for testing the high-voltage insulation of a solid-state battery, characterized in that, include: Electrodes and solid electrolyte layers are alternately stacked to form a stacked assembly to be tested, wherein any two adjacent electrodes have opposite polarities and the electrodes are insulated from each other. The two outermost electrodes of the stacked assembly are respectively connected to the positive and negative terminals of an external high-voltage power supply; A voltage signal is input to the two outermost electrodes of the stacked assembly; Obtain the actual leakage current of the stacked assembly; The actual leakage current is compared with a predetermined leakage current threshold, and the comparison result is used to determine whether a short circuit has occurred in the stacked assembly.

2. The high-voltage insulation test method for solid-state batteries according to claim 1, characterized in that, The two outermost electrodes in the stacked assembly have the same polarity, and both of the two outermost electrodes in the stacked assembly are either positive electrodes or negative electrodes.

3. The high-voltage insulation test method for solid-state batteries according to claim 1, characterized in that, The electrode includes a tab, and the tabs of any two adjacent electrodes are staggered. Each tab is insulated from the others. The tabs of the two outermost electrodes in the stacked assembly are respectively connected to the positive and negative terminals of an external high-voltage power supply.

4. The high-voltage insulation test method for solid-state batteries according to claim 1, characterized in that, A predetermined compressive stress is applied to the laminate assembly in the thickness direction.

5. The high-voltage insulation test method for solid-state batteries according to claim 4, characterized in that, A pressure loading assembly is provided, the pressure loading assembly including an upper pressure plate and a lower pressure plate, the stacked assembly is disposed between the upper pressure plate and the lower pressure plate, and the upper pressure plate and the lower pressure plate apply a predetermined compressive stress to the stacked assembly in the thickness direction of the stacked assembly.

6. The high-voltage insulation test method for solid-state batteries according to any one of claims 1 to 5, characterized in that, The stacked assembly is placed in a low-temperature environment, which is used to reduce the ionic conductivity of the stacked assembly.

7. The high-voltage insulation test method for solid-state batteries according to claim 6, characterized in that, The temperature of the low-temperature environment is less than or equal to -30 degrees Celsius.

8. The high-voltage insulation test method for solid-state batteries according to claim 6 or 7, characterized in that, An isolation element is provided, the isolation element having a sealed heat insulation cavity, the laminated assembly is placed in the sealed heat insulation cavity, refrigerant is introduced into the sealed heat insulation cavity or a heat exchanger is used to cool the sealed heat insulation cavity, so as to form the low temperature environment inside the sealed heat insulation cavity.

9. The high-voltage insulation test method for solid-state batteries according to claim 6 or 7, characterized in that, A pressure loading assembly is provided, comprising a refrigerant circulation pipe, an upper pressure plate, and a lower pressure plate. The refrigerant circulation pipe is provided on both the upper and lower pressure plates. The laminated assembly is disposed between the upper and lower pressure plates. In the thickness direction of the laminated assembly, the upper and lower pressure plates apply a predetermined compressive stress to the laminated assembly. The refrigerant circulation pipe cools the environment around the laminated assembly to create the low-temperature environment around the laminated assembly.

10. The high-voltage insulation test method for solid-state batteries according to any one of claims 1 to 9, characterized in that, After determining that no short circuit has occurred in the stacked assembly, the electrodes with the same polarity in the stacked assembly are electrically connected to form an electrode assembly.

11. A high-voltage insulation testing device for solid-state batteries, characterized in that, include: A processing apparatus for alternately stacking electrode sheets and solid electrolyte layers to form a stacked assembly, wherein any two adjacent electrode sheets have opposite polarities and the electrode sheets are insulated from each other; A high-voltage testing device is used to connect the two outermost electrodes of the laminated assembly to the positive and negative terminals of a high-voltage power supply, respectively. The high-voltage testing device is used to input voltage signals to the two outermost electrodes of the laminated assembly. A leakage current detection device is used to obtain the actual leakage current of the laminated assembly; A short-circuit detection device is used to compare the actual leakage current with a predetermined leakage current threshold, and to determine whether a short circuit has occurred in the laminated assembly based on the comparison result.

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