Battery cell, battery device, and electric device

Abstract

The application belongs to the technical field of batteries, and provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises laminated electrode pieces and a solid electrolyte. The solid electrolyte comprises a main structure and a support structure which are laminated. The support structure has a first surface and a second surface arranged oppositely in the thickness direction of the support structure. The first surface is in contact with the main structure, and the second surface is in contact with the electrode piece. The second surface is a plane. The support structure can be used by ions in an electrochemical reaction. The battery monomer, the battery device and the power utilization device provided by the application can reduce the risk of short circuit of the battery monomer.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and in particular relates to a battery cell, a battery device, and an electrical device. Background Technology

[0002] In the fabrication of all-solid-state batteries, the positive electrode, electrolyte, and negative electrode are first prepared separately, and then they are pressed into a dense structure using warm isostatic pressing (WIP). Because the yield strength of the solid electrolyte and the electrode is inconsistent, during the WIP process, the solid electrolyte layer is prone to surface unevenness due to uneven stress, ultimately leading to dimensional inhomogeneity in the electrode thickness direction. This can even exacerbate the risk of short circuits within the battery cell in areas where the solid electrolyte layer is relatively thin. Utility Model Content

[0003] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device, which aims to reduce the risk of short circuit in the battery cell.

[0004] In a first aspect, embodiments of this application provide a battery cell including stacked electrodes and a solid electrolyte. The solid electrolyte includes a stacked main structure and a support structure. The support structure has a first surface and a second surface disposed opposite to each other in its thickness direction. The first surface is in contact with the main structure, and the second surface is in contact with the electrodes. The second surface is a plane, and the support structure is capable of allowing ions in the electrical chemical reaction to pass through.

[0005] The battery cell provided in this application has a support structure in the solid electrolyte, and the side of the support structure that contacts the electrode (the second side) is flat. This makes it less likely that the electrode will be affected by the main structure in the solid electrolyte during the temperature isostatic pressing process, resulting in inconsistent thickness in different areas. This helps to make the electrode surface flat and the thickness uniform, which can reduce the risk of short circuits inside the battery cell to a certain extent and make the performance of the battery cell stable.

[0006] In some possible implementations of the first aspect, the support structure is provided with a through hole that connects the first surface and the second surface, and the through hole is filled with electrolyte packing.

[0007] The design of through holes and electrolyte fillers allows the electrode to directly contact and react with the electrolyte, reducing the adverse effects of the support structure on the electrochemical reactions of the battery cells.

[0008] In some possible implementations of the first aspect, the through-hole is provided along the thickness direction.

[0009] This configuration facilitates the fabrication of through-holes and allows for smaller through-hole dimensions in the thickness direction of the supporting structure. This results in shorter flow paths for ions participating in the electrochemical reaction within the through-holes, which in turn contributes to a faster reaction rate.

[0010] In some possible implementations of the first aspect, the through hole is larger than the thickness of the support structure at least in a first direction, which is perpendicular to the thickness direction.

[0011] The thickness of the support structure is generally small, and the size of the through hole is larger than the thickness of the support structure, at least in the first direction. This allows the cross-sectional area of ​​the through hole to be larger, which facilitates the passage of ions and helps to make the electrochemical reaction rate faster.

[0012] In some possible implementations of the first aspect, the size of the via in the first direction is 5μm-15μm.

[0013] The size of the through-hole in the first direction is 5μm-15μm, which facilitates the passage of ions without causing significant adverse effects on the structural strength or stability of the supporting structure, thus meeting the application requirements.

[0014] In some possible implementations of the first aspect, the thickness of the supporting structure is less than or equal to one-third of the thickness of the main structure.

[0015] This allows for a smaller support structure thickness and a smaller footprint, thus minimizing the impact of the support structure's configuration on the energy density of individual battery cells.

[0016] In some possible implementations of the first aspect, the thickness of the support structure is less than or equal to 2 μm.

[0017] The thickness of the support structure is less than or equal to 2 μm. This small thickness ensures that the support structure will not significantly affect the volume of the solid electrolyte and will have a minimal adverse impact on the electrochemical reaction of the battery cells.

[0018] In some possible implementations of the first aspect, the porosity of the support structure is less than or equal to 50%.

[0019] The porosity of the support structure is less than or equal to 50%, which facilitates the passage of ions and allows the support structure to provide a certain degree of structural strength.

[0020] In some possible implementations of the first aspect, the porosity of the support structure is 30%-45%.

[0021] The porosity of the support structure is 30%-45%, which facilitates the passage of ions and also ensures high structural strength, meeting the requirements for use.

[0022] Among some possible implementations of the first aspect, the supporting structure includes a rigid structure.

[0023] The support structure adopts a rigid structure, which makes it less prone to deformation during the isostatic pressing process, thus not affecting the thickness of the electrode sheet. This can reduce the risk of short circuits inside the battery cell to a certain extent, making the performance of the battery cell stable.

[0024] In some possible implementations of the first aspect, the support structure is a structure of equal thickness.

[0025] The support structure adopts a uniform thickness structure, which is convenient for fabrication.

[0026] In some possible implementations of the first aspect, the first surface is a plane.

[0027] The first side can be parallel to the second side or at an angle to it, depending on the specific needs of use.

[0028] The first surface is flat, which helps to make the surface of the main structure smooth.

[0029] In some possible implementations of the first aspect, the first face is parallel to the second face.

[0030] This facilitates the processing and manufacturing of the supporting structure and helps to ensure that the thickness of different areas of the main structure is relatively uniform.

[0031] In some possible implementations of the first aspect, the main structure has supporting structures on both sides in the thickness direction.

[0032] This design ensures that both sides of the solid electrolyte are planar along its thickness. When electrodes are located on both sides of the solid electrolyte, the thickness distribution of the electrodes on both sides is unaffected by the thickness distribution of the main structure. This allows the electrode thickness to remain consistent across different regions, contributing to the stability of the battery cell's performance. Furthermore, this design prevents stress from easily reaching the easily deformable main structure through the supporting structure, making areas with less material in the main structure less prone to thinning.

[0033] Among some possible implementations of the first aspect, the supporting structure includes a ceramic structure.

[0034] Ceramic structures offer advantages such as high stability and high mechanical strength. Including ceramic structures in the support structure ensures its stability and physically prevents lithium dendrite penetration, thus reducing the risk of short circuits in individual battery cells to some extent.

[0035] Secondly, embodiments of this application provide a battery device, including a battery cell provided by any of the above solutions.

[0036] Thirdly, embodiments of this application provide an electrical device, including a battery cell or battery device provided by any of the above solutions.

[0037] The effects of the second and third aspects are the same as those of the first aspect, and will not be elaborated here.

[0038] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0039] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. 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:

[0040] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0041] Figure 2 This is an exploded view of the battery device provided in some embodiments of this application;

[0042] Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application;

[0043] Figure 4 This is a schematic diagram of the structure of the electrode assembly in a battery cell provided in some embodiments of this application;

[0044] Figure 5 This is a schematic diagram of the structure of the solid electrolyte in a battery cell provided in some embodiments of this application;

[0045] Figure 6 This is a cross-sectional view of the support structure in a battery cell provided in some embodiments of this application.

[0046] The reference numerals in the detailed embodiments are as follows:

[0047] 1000, vehicles;

[0048] 100. Battery assembly; 200. Controller; 300. Motor;

[0049] 10. Housing; 11. Cover; 12. Tray; 20. Cell battery; 21. End cap; 22. Shell; 23. Electrode assembly; 231. Main body; 232. Tab; 24. Electrode sheet; 25. Solid electrolyte; 251. Main structure; 252. Support structure; 252a. First surface; 252b. Second surface; 26. Through hole; 27. Electrolyte filler;

[0050] X, first direction; Z, thickness direction. Detailed Implementation

[0051] 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.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0053] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0054] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0055] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0056] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0057] 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," and "circumferential" 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 are not intended to 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.

[0058] In the description of the embodiments of this application, unless otherwise expressly specified and limited, 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.

[0059] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0060] An all-solid-state battery (ASSB) is a rechargeable battery that uses a solid electrolyte (containing no liquid or gel components). Its core characteristic is that both the electrodes (positive and negative) and the electrolyte are solid materials. In the fabrication of an all-solid-state battery, the positive electrode, electrolyte, and negative electrode are first prepared separately, and then pressed together using warm isostatic pressing (WIP) to form a dense structure. Due to the inconsistent yield strength between the solid electrolyte and the electrodes, the solid electrolyte layer is prone to surface unevenness during the WIP process. This can lead to dimensional inhomogeneity in the thickness direction of the electrodes, and even increase the risk of short circuits within the battery cell in areas where the solid electrolyte layer is thinner.

[0061] To address the aforementioned issues, this application provides a battery cell. The solid electrolyte in this battery cell incorporates a support structure, and the side of the support structure that contacts the electrode (the second side) is planar. This design minimizes the impact of the solid electrolyte's main structure on the thickness of the electrode during isostatic pressing, thus reducing the risk of short circuits within the battery cell and ensuring stable performance.

[0062] The battery cells disclosed in this application can be used in battery devices and electrical devices that use the battery cells as a power source, or in various energy storage devices, energy storage systems, and charging networks that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0063] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0064] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 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 device 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000. For example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0065] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0066] Please refer to Figure 2 , Figure 2 This is an exploded structural diagram of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 and battery cells 20, with the battery cells 20 housed within the housing 10.

[0067] The housing 10 provides a storage space for the battery cells 20, and can adopt various structures. In some embodiments, the housing 10 may include a cover 11 and a tray 12. The cover 11 covers the tray, and together with the tray 12, defines a storage space for accommodating the battery cells 20. The tray 12 may be a hollow structure with one open end, and the cover 11 may be a plate-like structure, covering the open side of the tray 12 so that the cover 11 and the tray 12 together define the storage space; the cover 11 and the tray 12 may also be hollow structures with side openings, with the open side of the cover 11 covering the open side of the tray 12. Of course, the housing 10 formed by the cover 11 and the tray 12 can be of various shapes, such as a circular through-hole, a cuboid, etc. The tray 12 is an important structural support component in the battery system, used to store and protect the battery cells, and also has a significant impact on the collision safety of the vehicle and the overall torsional and bending stiffness of the vehicle body.

[0068] Multiple battery cells 20 can be provided, and these cells can be connected in series, parallel, or mixed connection via a busbar. Mixed connection refers to a configuration where multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or mixed connection, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or mixed connection to form a battery module, and then multiple battery modules connected in series, parallel, or mixed connection to form a whole, housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar for electrical connection between the multiple battery cells 20. As an example, multiple battery cells 20 can form a battery module, which is an independent module formed by arranging and fixing multiple battery cells 20. As an example, a battery module can be formed by binding multiple battery cells 20 together with cable ties.

[0069] Each battery cell 20 can be a secondary battery or a primary battery. A secondary battery refers to a battery cell that can be recharged after discharge to activate the active materials and continue to be used. The battery cell 20 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application embodiment is not limited to this. The battery cell can have a circular through-body, a flat body, a cuboid, or other shapes.

[0070] Please refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application. The battery cell 20 refers to the smallest unit that makes up a battery. For example... Figure 3The battery cell 20 includes an end cap 21, a housing 22, an electrode assembly 23, and other functional components.

[0071] End cap 21 refers to a component that covers the opening of housing 22 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 21 can be adapted to the shape of housing 22 to fit it. Optionally, end cap 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 21 is not easily deformed under pressure and impact, giving battery cell 20 higher structural strength and improved safety performance. Functional components such as electrode terminals can be provided on end cap 21. Electrode terminals can be used for electrical connection with electrode assembly 23 for outputting or inputting electrical energy into battery cell 20. In some embodiments, end cap 21 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 20 reaches a threshold. The material of end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 21. The insulating element can be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0072] The housing 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 23, electrolyte, and other components. The housing 22 and the end cap 21 can be independent components. An opening can be provided on the housing 22, and the end cap 21 can be used to close the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and the housing 22 can be integrated. Specifically, the end cap 21 and the housing 22 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 22, the end cap 21 closes the housing 22. The housing 22 can be of various shapes and sizes, such as cuboid, circular through-hole, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special limitations on this.

[0073] Electrode assembly 23 is the component in the battery cell 20 where electrochemical reactions occur. The casing 22 may contain one or more electrode assemblies 23. The electrode assembly 23 is mainly formed by stacking positive and negative electrode plates, and typically a separator is provided between the positive and negative electrode plates. The portions of the positive and negative electrode plates containing active material constitute the main body 231 of the electrode assembly 23, while the portions of the positive and negative electrode plates without active material each constitute a tab 232. The positive and negative tabs may be located together at one end of the main body 231 or separately at both ends of the main body 231. During the charging and discharging process of the battery cell 20, the positive and negative active materials react with the electrolyte, and the tabs 232 connect to the electrode terminals to form a current loop.

[0074] Please refer to Figure 4 and Figure 5 , Figure 4 This is a schematic diagram of the structure of the electrode assembly in a battery cell provided in some embodiments of this application. Figure 5 This is a schematic diagram of the structure of a solid electrolyte in a battery cell provided in some embodiments of this application. The battery cell includes stacked electrode sheets 24 and a solid electrolyte 25. The solid electrolyte 25 includes a stacked main structure 251 and a support structure 252. The support structure 252 has a first surface 252a and a second surface 252b disposed opposite to each other in its thickness direction Z. The first surface 252a is in contact with the main structure 251. The second surface 252b is in contact with the electrode sheets 24. The second surface 252b is planar. The support structure 252 allows ions in the electrical chemical reaction to pass through.

[0075] Electrode 24 includes a positive electrode and a negative electrode.

[0076] The electrode 24 and the solid electrolyte 25 are stacked in a manner that is, solid electrolyte 25, positive electrode, solid electrolyte 25, negative electrode, solid electrolyte 25, positive electrode, solid electrolyte 25, negative electrode, ..., solid electrolyte 25. The stacked electrode 24 and solid electrolyte 25 form the electrode assembly 23 described above.

[0077] In this embodiment, the solid electrolyte 25 may include only the main structure 251 and the support structure 252, or it may include other structures in addition to the main structure 251 and the support structure 252, depending on the specific needs of use.

[0078] Among them, the main structure 251 is the main structure of the solid electrolyte 25. It can adopt the general setting method of solid electrolyte 25, which can be a single-layer structure or a multi-layer structure, depending on the application requirements.

[0079] The support structure 252 is disposed between the main structure 251 and the electrode 24, and bears the pressure exerted by the main structure 251 on the electrode 24 during the isostatic pressing process. The support structure 252 itself has pores, allowing ions (such as cations (positively charged ions), anions (negatively charged ions), and other special ions) in the electrochemical reaction of the battery cell to pass through.

[0080] In this embodiment, one or more support structures 252 can be provided in the same solid electrolyte 25, depending on the application requirements. When the support structure 252 is provided in multiple layers, the main structure 251 can be provided with support structures 252 on both sides opposite to each other in the thickness direction Z, or multiple support structures 252 can be provided on the same side of the main structure 251.

[0081] The support structure 252 can be made of a material with greater rigidity than the main structure 251. In this way, the support structure 252 is not easily deformed during the warm isostatic pressing process. Even if the thickness of different areas of the main structure 251 is inconsistent, at least one side of the solid electrolyte 25 in contact with the electrode 24 is also a plane, which will not lead to inconsistent thickness of different areas of the electrode 24.

[0082] Therefore, it can be seen that the battery cell provided in this application embodiment has a support structure 252 in the solid electrolyte 25, and the side of the support structure 252 that contacts the electrode 24 (the second side 252b) is flat. This makes it less likely that the electrode 24 will be affected by the main structure 251 in the solid electrolyte 25 during the temperature isostatic pressing process, resulting in inconsistent thickness in different areas. This helps to make the surface of the electrode 24 flat and the thickness uniform. This can reduce the risk of short circuits inside the battery cell 20 to a certain extent, and make the performance of the battery cell stable.

[0083] Figure 6 This is a cross-sectional view of the support structure in a battery cell provided in some embodiments of this application.

[0084] like Figure 6 As shown, in some embodiments, the support structure 252 is provided with a through hole 26. The through hole 26 connects the first surface 252a and the second surface 252b. An electrolyte filler 27 is provided inside the through hole 26.

[0085] The through hole 26 can extend in one direction or in multiple directions, depending on the application requirements. It should be noted that the cross-sectional dimension of the through hole 26 is generally larger than the cross-sectional dimension of the pores in the support structure 252 itself.

[0086] The material of the electrolyte filler 27 can be the same as or different from the material of the main structure 251, depending on the application requirements.

[0087] The through-hole 26 and electrolyte filler 27 allow the electrode 24 to directly contact and react with the electrolyte, which can reduce the adverse effects of the support structure 252 on the electrochemical reaction of the battery cell.

[0088] In some embodiments, the through hole 26 is provided along the thickness direction Z.

[0089] The through hole 26 is set along the thickness direction Z, which means that the axis of the through hole 26 is perpendicular to the thickness direction Z of the support structure 252.

[0090] This configuration facilitates the fabrication of the through-hole 26 and allows the through-hole 26 to have a smaller dimension in the thickness direction Z of the support structure 252. This results in a shorter flow path for ions participating in the electrochemical reaction within the through-hole 26, which helps to accelerate the electrochemical reaction rate.

[0091] like Figure 6 As shown, in some embodiments, the dimension W of the through hole 26 is greater than the thickness H1 of the support structure 252 at least in the first direction X. The first direction X is perpendicular to the thickness direction Z.

[0092] The first direction X can be a direction perpendicular to the thickness direction Z, or any other direction.

[0093] The thickness H1 of the support structure 252 is generally small, and the size W of the through hole 26 is larger than the thickness H1 of the support structure 252 at least in the first direction X. This allows the cross-sectional area of ​​the through hole 26 to be larger, which facilitates the passage of ions and helps to make the electrochemical reaction rate faster.

[0094] In some embodiments, the size W of the through hole 26 in the first direction X is 5μm-15μm.

[0095] For example, the size W of the through hole 26 in the first direction X can be 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 11μm, 12μm, 14μm, 15μm, etc., which can be determined according to the application requirements.

[0096] The through-hole 26 has a size of 5μm-15μm in the first direction X, which facilitates the passage of ions without causing significant adverse effects on the structural strength or stability of the support structure 252, thus meeting the usage requirements.

[0097] like Figure 5 As shown, in some embodiments, the thickness H1 of the support structure 252 is less than or equal to 1 / 3 of the thickness H2 of the main structure 251.

[0098] The thickness H1 of the support structure 252 refers to the dimension of the support structure 252 in the thickness direction Z. The thickness H2 of the main structure 251 refers to the dimension of the main structure 251 in the thickness direction Z.

[0099] The thickness H1 of the support structure 252 is less than or equal to 1 / 3 of the thickness H2 of the main structure 251, i.e., H1 ≤ H2 * 1 / 3. This allows the support structure 252 to have a smaller thickness and occupy less space, thus minimizing its impact on the energy density of the battery cells.

[0100] In some embodiments, the thickness H1 of the support structure 252 is less than or equal to 2 μm.

[0101] The thickness H1 of the support structure 252 is less than or equal to 2 μm. The small thickness ensures that the setting of the support structure 252 will not have a significant impact on the volume of the solid electrolyte and will have a small adverse impact on the electrochemical reaction of the battery cell.

[0102] In some embodiments, the cross-section of the through hole 26 is circular, triangular, rectangular, irregular, or other shapes.

[0103] When the cross-section of the through hole 26 is a regular shape, such as a circle, triangle, or rectangle, the through hole 26 is easy to manufacture. When the cross-section of the through hole 26 is circular, the dimension of the through hole 26 in the first direction X is the diameter of the through hole 26.

[0104] When the cross-section of the through hole 26 is an irregular shape, it can be set to any shape according to the needs of use.

[0105] In some embodiments, the porosity of the support structure 252 is less than or equal to 50%.

[0106] Porosity is the percentage of the sum of the volumes of pores and through holes 26 inherent in the support structure 252 to the total volume of the support structure 252.

[0107] In this embodiment, the porosity of the support structure 252 can be 20%, 30%, 33%, 35%, 40%, 42%, 45%, 50%, etc.

[0108] The porosity of the support structure 252 is less than or equal to 50%, which facilitates the passage of ions and also allows the structural strength of the support structure 252 to play a certain supporting role.

[0109] In some embodiments, the porosity of the support structure 252 is 30%-45%.

[0110] Porosity is the percentage of the sum of the volumes of pores and through holes 26 inherent in the support structure 252 to the total volume of the support structure 252.

[0111] In this embodiment, the porosity of the support structure 252 can be 30%, 33%, 35%, 40%, 42%, 45%, etc.

[0112] The porosity of the support structure 252 is 30%-45%, which facilitates the passage of ions and also ensures that the support structure 252 has high structural strength, thus meeting the application requirements.

[0113] In some embodiments, the support structure 252 includes a rigid structure.

[0114] In this embodiment, the support structure 252 may include only a rigid structure, or it may include an elastic structure in addition to a rigid structure, or other structures, depending on the usage requirements.

[0115] It should be noted that when the support structure 252 includes other structures besides the rigid structure, the other structures can be stacked with the rigid structure or placed inside the rigid structure, as long as the side of the support structure 252 that contacts the electrode 24 (the second side 252b) during the isostatic pressing operation is always a plane.

[0116] Rigid structures are structures whose geometry remains essentially unchanged under external forces. Their core characteristic is high stiffness, which can resist elastic deformation and bending.

[0117] The support structure 252 adopts a rigid structure, which makes it less prone to deformation during the isostatic pressing process, thus not affecting the thickness of the electrode 24. This can reduce the risk of short circuits inside the battery cell 20 to a certain extent, making the performance of the battery cell stable.

[0118] In some embodiments, the support structure 252 is a structure of uniform thickness.

[0119] A uniform thickness structure is a structure in which the thickness is the same in different regions.

[0120] The support structure 252 adopts a uniform thickness structure, which is convenient for fabrication.

[0121] like Figure 5 As shown, in some embodiments, the main structure 251 has support structures 252 on both sides of its thickness direction Z.

[0122] This design ensures that both sides of the solid electrolyte 25 are planar in the thickness direction Z. When electrodes 24 are provided on both sides of the solid electrolyte 25, the thickness distribution of the electrodes 24 on both sides of the solid electrolyte 25 is unaffected by the thickness distribution of the main structure 251. This allows the thickness of the electrodes 24 to remain consistent across different regions, thus contributing to the stability of the battery cell's performance. Furthermore, this design prevents pressure from easily reaching the easily deformable main structure 251 through the supporting structure 252, making it less likely for areas of the main structure 251 with less material to be thinned.

[0123] In some embodiments, the first surface 252a is a plane.

[0124] The first surface 252a can be parallel to the second surface 252b, or it can be set at an angle to the second surface 252b, depending on the specific needs of use.

[0125] The first surface 252a is a plane, which helps to make the surface of the main structure 251 flat.

[0126] In some embodiments, the first surface 252a is parallel to the second surface 252b.

[0127] This facilitates the processing and manufacturing of the support structure 252 and helps to ensure that the thickness of different areas of the main structure 251 is relatively uniform.

[0128] In some embodiments, the support structure 252 includes a ceramic structure.

[0129] In this embodiment, the support structure 252 may include only a ceramic structure, or it may include other structures in addition to the ceramic structure, as long as it can meet the above support requirements and does not affect the electrochemical reaction of the battery cell.

[0130] Ceramic structures offer advantages such as high stability and high mechanical strength. The support structure 252, including a ceramic structure, ensures stable performance and physically prevents lithium dendrite penetration, thus reducing the risk of short circuits in individual battery cells to some extent.

[0131] According to some embodiments of this application, this application also provides a battery device, including a battery cell provided by any of the above solutions.

[0132] The battery device provided in this application embodiment includes the above-mentioned battery cell and can achieve the same effect, which will not be described in detail here.

[0133] According to some embodiments of this application, this application also provides an electrical device, including a battery cell or battery device provided by any of the above solutions. The battery cell or battery device is used to store or provide electrical energy.

[0134] The electrical device can be any of the aforementioned battery-powered equipment or systems.

[0135] The electrical device provided in this application embodiment includes the above-mentioned battery cell or battery device, which can achieve the same effect, and will not be described in detail here.

[0136] like Figures 3 to 6 As shown, one embodiment of this application provides a battery cell. The battery cell includes stacked electrode sheets 24 and a solid electrolyte 25. The solid electrolyte 25 includes a stacked main structure 251 and a support structure 252. The main structure 251 has support structures 252 on both sides in the thickness direction Z. The support structures 252 are flat ceramic structures. The support structure 252 has a first surface 252a and a second surface 252b disposed opposite to each other in the thickness direction Z. The first surface 252a contacts the main structure 251, and the second surface 252b contacts the electrode sheets 24; the second surface 252b is planar. The support structure 252 allows ions in the electrochemical reaction to pass through.

[0137] The support structure 252 has a through hole 26. The through hole 26 connects the first surface 252a and the second surface 252b. Electrolyte filler 27 is provided inside the through hole 26. The through hole 26 is arranged along the thickness direction Z.

[0138] The thickness of the support structure 252 is less than or equal to 2 μm. The cross-section of the through hole 26 is circular. The pore diameter of the through hole 26 is 5 μm-15 μm. The porosity of the support structure 252 is 30%-45%.

[0139] Using the support structure 252 provided in this embodiment, during the compression process, when the support structure 252 is subjected to uneven pressure, because it is not easily deformed and has a certain thickness, the force will not be directly transmitted to the main structure 251 of the more easily deformable solid electrolyte 25. In addition, this support structure 252 can be used as both a mechanical support and for ion separation and transport.

[0140] To achieve a good leveling effect on the surface of the solid electrolyte 25, the support structure 252 needs to provide excellent mechanical support and leveling. To improve the ion transport performance of the support structure 252, the electrolyte filler 27 uses a sulfide electrolyte. The preparation of the electrolyte filler 27 mainly involves first adding the sulfide electrolyte to a solvent to form a slurry, which is then poured into the through-holes 26 of the support structure 252. The solvent is used to ensure good mixing of the electrolyte slurry. Solvents such as esters and ethers can be used to dissolve the electrolyte, ensuring good dissolution and mixing.

[0141] In order to reduce the obstruction of the support structure 252 to the transport of active ions, the thickness H1 of the support structure 252 needs to be controlled to be less than 2μm. In this way, the support structure 252 can both flatten the surface of the solid electrolyte 25 and not reduce the transport of active ions.

[0142] The support structure 252 can make the surface uniformity of the solid electrolyte 25 higher, so that the upper and lower surfaces of the entire solid electrolyte 25 can be shaped, avoiding the occurrence of short circuits in the battery cell 20 due to uneven surface thickness.

[0143] 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 battery cell, characterized in that, The device includes stacked electrodes and a solid electrolyte. The solid electrolyte includes a stacked main structure and a support structure. The support structure has a first surface and a second surface that are opposite to each other in its thickness direction. The first surface is in contact with the main structure, and the second surface is in contact with the electrodes. The second surface is a plane. The support structure allows ions in the electrochemical reaction to pass through.

2. The battery cell as described in claim 1, characterized in that, The support structure is provided with a through hole, which connects the first surface and the second surface, and an electrolyte filler is provided inside the through hole.

3. The battery cell as described in claim 2, characterized in that, The through hole is provided along the thickness direction.

4. The battery cell as described in claim 2, characterized in that, The through hole is larger than the thickness of the support structure at least in a first direction, the first direction being perpendicular to the thickness direction.

5. The battery cell as described in claim 4, characterized in that, The size of the through hole in the first direction is 5μm-15μm.

6. The battery cell according to any one of claims 1-5, characterized in that, The thickness of the support structure is less than or equal to 1 / 3 of the thickness of the main structure.

7. The battery cell according to any one of claims 1-5, characterized in that, The thickness of the support structure is less than or equal to 2 μm.

8. The battery cell according to any one of claims 1-5, characterized in that, The porosity of the support structure is less than or equal to 50%.

9. The battery cell according to any one of claims 1-5, characterized in that, The porosity of the support structure is 30%-45%.

10. The battery cell according to any one of claims 1-5, characterized in that, The supporting structure includes a rigid structure.

11. The battery cell according to any one of claims 1-5, characterized in that, The supporting structure is of uniform thickness.

12. The battery cell according to any one of claims 1-5, characterized in that, The first surface is a plane.

13. The battery cell according to any one of claims 1-5, characterized in that, The first face is parallel to the second face.

14. The battery cell according to any one of claims 1-5, characterized in that, The main structure has the supporting structure on both sides in the thickness direction.

15. The battery cell according to any one of claims 1-5, characterized in that, The supporting structure includes a ceramic structure.

16. A battery device, characterized in that, Includes the battery cell according to any one of claims 1-15.

17. An electrical device, characterized in that, Includes a battery cell according to any one of claims 1-15 or a battery device according to claim 16.

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