Solid-state battery core, solid-state battery cell, solid-state battery and electrical apparatus

Abstract

The present application relates to a solid-state battery core, a solid-state battery cell, a solid-state battery and an electrical apparatus. The solid-state battery core comprises a positive electrode part, a solid electrolyte part and a negative electrode part which are stacked, the positive electrode part and the negative electrode part being separated by the solid electrolyte part. The positive electrode part comprises a positive electrode body and a positive tab part connected to the positive electrode body, and the negative electrode part comprises a negative electrode body and a negative tab part connected to the negative electrode body. At at least one side edge extending in the width direction of the solid-state battery core, the solid-state battery core is provided with a first composite slot and a second composite slot, the first composite slot being used for accommodating at least part of the positive tab part, and the second composite slot being used for accommodating at least part of the negative tab part.

Description

Solid-state battery cells, solid-state battery cells, solid-state batteries and electrical devices

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. CN2024218403275, filed on July 31, 2024, entitled "Solid-state battery cell, solid-state battery cell, solid-state battery and power device", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of solid-state battery technology, and further to solid-state cells, solid-state battery cells, solid-state batteries, and electrical devices. Background Technology

[0004] The statements herein are provided only as background information in connection with this application and do not necessarily constitute prior art.

[0005] Solid-state batteries use a non-flammable solid electrolyte instead of the organic electrolyte in traditional liquid secondary batteries, significantly improving battery safety and are considered the next generation of batteries closest to industrialization. Further increasing energy density is crucial for advancing the industrialization of solid-state batteries. Summary of the Invention

[0006] According to various embodiments and examples of this application, this application provides a solid-state battery cell, a solid-state battery cell, a solid-state battery, and an electrical device. This solid-state battery cell can be used to improve the energy density of a battery.

[0007] In a first aspect of this application, a solid-state battery cell is provided having an active extended region.

[0008] In some embodiments, this application provides a solid-state battery cell, which includes a positive electrode portion, a solid electrolyte portion, and a negative electrode portion stacked together, wherein the positive electrode portion and the negative electrode portion are isolated by the solid electrolyte portion; the positive electrode portion includes a positive electrode body and a positive electrode tab connected to the positive electrode body, and the negative electrode portion includes a negative electrode body and a negative electrode tab connected to the negative electrode body;

[0009] The height direction of the solid-state battery cell is denoted as the Y direction, the width direction as the X direction, and the thickness direction as the Z direction; the X direction, the Y direction, and the Z direction are perpendicular to each other;

[0010] At at least one edge extending along the X direction, the solid-state battery cell is provided with two composite grooves, referred to as the first composite groove and the second composite groove, respectively; the first composite groove is used to accommodate at least a portion of the positive electrode tab, and the second composite groove is used to accommodate at least a portion of the negative electrode tab.

[0011] This solid-state battery cell features a first composite groove at the positive electrode tab, allowing it to bend inwards, and a second composite groove at the negative electrode tab, also allowing it to bend inwards. An active extension region is formed in the area outside the first and second composite grooves along the width of the solid-state battery cell, at the same height as these grooves. In other words, along the width of the solid-state battery cell, an active extension region with the same height as the first and second composite grooves is provided in the space outside the positive and negative electrode tabs. This allows the solid-state battery cell to better utilize the space at the tabs, significantly increasing the volumetric energy density of the electrodes and thus improving the overall volumetric energy density of the solid-state battery. The two composite grooves also provide protection for the tabs, reducing the risk of tab breakage.

[0012] In the solid-state battery cell, the active region that is at the same height as the first composite groove and the second composite groove in the Y direction and is located outside the first composite groove and the second composite groove in the X direction is called the active extension region.

[0013] In some embodiments, the height of the positive electrode body at the active extension region is higher than the height of the positive electrode body at the first composite groove, and the height of the negative electrode body at the active extension region is higher than the height of the negative electrode body at the second composite groove.

[0014] The height of the positive electrode body in the Y direction is denoted as H. P The height of the negative electrode body in the Y direction is denoted as H. N The height of the solid-state battery cell in the Y direction is denoted as H0; the height region of the solid-state battery cell with the two composite grooves in the Y direction is denoted as the active extension region, and the maximum height of the active extension region in the Y direction is denoted as H. Δ Satisfying H Δ >0;H P >(H0-H Δ And H N >(H0-H Δ ).

[0015] In the aforementioned solid-state cell structure, the height of the positive electrode body at the active extension region is higher than the height of the positive electrode body at the first composite groove, and the height of the negative electrode body at the active extension region is higher than the height of the negative electrode body at the second composite groove. This allows the solid-state cell to make better use of the space at the tabs, thereby significantly increasing the volume of space occupied by the electrode portion in the solid-state cell and significantly improving the volumetric energy density of the solid-state cell and solid-state battery.

[0016] In some implementations, H NIt is equal to H0. At this point, the space at the tab can be used to the maximum extent to set the electrode active material layer, thereby maximizing the volumetric energy density of the solid-state cell and solid-state battery.

[0017] In some embodiments, the utilization rate ψ of the active extension region in the Y direction Y =H Δ / H0×100%;

[0018] The solid-state battery cell satisfies one or more of the following characteristics:

[0019] H Δ ≥0.05mm;

[0020] ψ Y ≥0.05%.

[0021] In some embodiments, the solid-state battery cell satisfies one or more of the following characteristics:

[0022] 0.05mm≤H Δ ≤1mm;

[0023] 0.1%≤ψ Y ≤2%.

[0024] By using the height parameter h of the active extension region Δ and utilization parameter ψ Y One or two of the aforementioned adjustments are beneficial for better utilizing the space in the height direction at the pole position.

[0025] In some embodiments, the width of the solid-state cell in the X direction is denoted as W0, and the width of the active extension region in the X direction is denoted as W. Δ The utilization rate ψ of the active extension region in the X direction X =W Δ / W0×100%;

[0026] The solid-state battery cell satisfies one or more of the following characteristics:

[0027] W Δ ≥50mm;

[0028] ψ X ≥60%.

[0029] In some embodiments, the solid-state battery cell satisfies one or more of the following characteristics:

[0030] 50mm≤W Δ ≤1000mm;

[0031] 60%≤ψ X≤95%.

[0032] By adjusting the width parameter w of the active extension region Δ and utilization parameter ψ X One or two of the aforementioned adjustments are beneficial for better utilizing the space in the width direction at the electrode position.

[0033] In some embodiments, the projected area of ​​the solid-state cell along the Z direction is denoted as A0, and the projected area of ​​the active extension region along the Z direction is denoted as A Δ The two-dimensional utilization rate ψ of the active extended region A =A Δ / A0×100%;

[0034] The solid-state battery cell satisfies: ψ A ≥0.04%.

[0035] In some embodiments, the solid-state battery cell satisfies: 0.04% ≤ ψ A ≤1.5%.

[0036] By increasing the two-dimensional utilization rate ψ of the active extension region A Within the aforementioned range, regulation is conducive to better comprehensive utilization of the idle space at the electrode tab.

[0037] In some embodiments, the extension height of the positive electrode ear in the extended state in the Y direction is greater than the height of the first composite groove in the Y direction;

[0038] The extension height of the negative electrode ear in the extended state in the Y direction is greater than the height of the second composite groove in the Y direction.

[0039] By reserving a certain extension height for the positive or negative tab, it is easy to use it as a soft tab to be transferred to a hard tab in subsequent processes.

[0040] In some embodiments, the positive electrode ear includes a positive electrode ear bend located within the first composite groove; the negative electrode ear includes a negative electrode ear bend located within the second composite groove.

[0041] At least a portion of the positive and / or negative electrode tabs in a solid-state battery cell can be bent inward into the corresponding composite groove. With sufficient height reserved for the positive and negative electrode tabs, this can further increase the volume occupancy of the electrode portion in the solid-state battery cell, and significantly improve the volumetric energy density of the solid-state battery cell and solid-state battery.

[0042] In some embodiments, the width of the positive electrode ear in the X direction is smaller than the width of the first composite groove in the X direction;

[0043] The width of the negative electrode ear in the X direction is smaller than the width of the second composite groove in the X direction.

[0044] In some embodiments, in the X direction, there is a gap between the positive electrode ear and the two side edges of the first composite groove, and a gap between the negative electrode ear and the two side edges of the second composite groove.

[0045] By leaving a certain gap on both sides of the corresponding electrode tab at the composite groove, suitable space for movement of the positive and negative electrode tabs can be reserved, and the positive and negative electrode tabs can be bent into the composite groove more easily.

[0046] In some embodiments, the solid-state battery cell has a stacked structure.

[0047] In some embodiments, the positive electrode body includes at least one positive electrode layer, each positive electrode layer having a groove corresponding to the first composite groove and the second composite groove respectively, and a positive electrode tab is provided at the groove corresponding to the first composite groove in the at least one positive electrode layer;

[0048] The negative electrode body includes at least one negative electrode layer, each negative electrode layer having a groove corresponding to the second composite groove and the first composite groove respectively, and a negative electrode tab is provided at the groove corresponding to the second composite groove in the at least one negative electrode layer;

[0049] The solid electrolyte section includes at least one solid electrolyte layer, and any adjacent positive electrode layer and negative electrode layer are isolated by the solid electrolyte layer; each solid electrolyte layer has an empty groove corresponding to the first composite groove and the second composite groove respectively.

[0050] In some embodiments, the positive electrode body includes at least one positive electrode layer, each positive electrode layer independently includes a positive electrode current collector layer and a positive electrode active material layer located on at least one side of the positive electrode current collector layer, each positive electrode layer has a positive electrode tab groove, all the positive electrode tab grooves in the positive electrode body together constitute a part of the first composite groove, the positive electrode current collector layer in the at least one positive electrode layer is connected to a positive electrode tab at the corresponding positive electrode tab groove, and all the positive electrode tabs connected to the positive electrode body together constitute at least a part of the positive electrode tab portion;

[0051] The negative electrode body includes at least one negative electrode layer. Each negative electrode layer independently includes a negative electrode current collector layer and a negative electrode active material layer located on at least one side of the negative electrode current collector layer. Each negative electrode layer has a negative electrode tab groove. All negative electrode tab grooves in the negative electrode body together constitute a part of the first composite groove. The negative electrode current collector layer in the at least one negative electrode layer is connected to a negative electrode tab at the corresponding negative electrode tab groove. All negative electrode tabs connected to the negative electrode body together constitute at least a part of the negative electrode tab portion.

[0052] When the solid-state battery cell adopts the aforementioned stacked structure, at the first composite groove, the positive electrode tab groove on the positive electrode layer, the empty groove on the negative electrode layer, and the empty groove on the solid electrolyte layer can be combined to form a concave space that allows the positive electrode tab to bend inward; at the second composite groove, the negative electrode tab groove on the negative electrode layer, the empty groove on the positive electrode layer, and the empty groove on the solid electrolyte layer can be combined to form a concave space that allows the negative electrode tab to bend inward.

[0053] In some embodiments, the positive electrode body has multiple positive electrode layers; the negative electrode body has a number of negative electrode layers that matches the number of positive electrode layers in the positive electrode body.

[0054] When the number of positive electrode layers in the positive electrode body is multi-layered and the number of negative electrode layers in the negative electrode body is a matching multi-layered structure, the stacked structure corresponds to a multi-layered stacked structure. In this case, by utilizing the aforementioned active extension region structure design, it is beneficial to gain more volumetric energy density in the tab space.

[0055] In some embodiments, a plurality of positive electrode layers in the positive electrode body are connected to the positive electrode tabs; and a plurality of negative electrode layers in the negative electrode body are connected to the negative electrode tabs.

[0056] When multiple positive electrode layers in the positive electrode body are connected to positive electrode tabs and multiple negative electrode layers in the negative electrode body are connected to negative electrode tabs, it is more conducive to saving the waste of internal space caused by the stacking of multiple electrode tabs.

[0057] In a second aspect of this application, a solid-state battery cell is provided, which includes the solid-state cell described in the first aspect of this application.

[0058] In a third aspect of this application, a solid-state battery is provided, which includes the solid-state cell described in the first aspect of this application.

[0059] In some embodiments, the solid-state battery is an all-solid-state battery.

[0060] In a fourth aspect of this application, an electrical device is provided, comprising at least one of the solid-state battery cell described in the first aspect of this application, the solid-state battery cell described in the second aspect of this application, and the solid-state battery described in the third aspect of this application.

[0061] Solid-state battery cells, including the aforementioned solid-state battery cells, increase the volume of the electrode body at the tab height, thereby increasing the space occupancy of the electrode active material layer and significantly improving the volumetric energy density.

[0062] Details of one or more embodiments or examples of this application are set forth in the following drawings and description. Other features, objects, and advantages of this application will become apparent from the specification, drawings, and claims. Attached Figure Description

[0063] To better describe and illustrate the embodiments, examples, or models provided in this application, reference may be made to one or more accompanying drawings. Additional details or examples used to describe the drawings should not be considered as limiting the scope of any of the disclosed applications, the currently described embodiments, examples, or models, or the best mode of these applications as currently understood. Furthermore, the same reference numerals denote the same parts throughout the drawings. It should also be noted that the drawings are drawn in a simplified form and are only intended to facilitate and clarify the illustration of this application. The various dimensions of each part shown in the drawings are arbitrarily shown and may be precise or not drawn to scale. For example, the dimensions of parts are appropriately exaggerated in some places in the drawings to make the illustration clearer. Unless otherwise specified, the parts in the drawings are not drawn to scale. This application does not limit every dimension of every part.

[0064] In the attached diagram:

[0065] Figure 1 is a schematic diagram of the structure of a solid-state battery cell in one embodiment of this application; wherein (a) is the main view, (AA), (BB) and (CC) are cross-sectional views of the positions of AA, BB and CC respectively; the dashed lines are reference lines.

[0066] Figure 2 is a schematic diagram of the preparation process of the positive electrode and the negative electrode in one embodiment of this application; wherein, (a) from left to right corresponds to the three structures involved in the preparation process of the positive electrode, namely, the positive electrode current collector film, the positive electrode multilayer formed by stacking a positive electrode active region with a positive electrode concave blank area on the surface of the positive electrode current collector film, and the positive electrode sheet including a positive electrode tab formed by die cutting; (b) from left to right corresponds to the three structures involved in the preparation process of the negative electrode, namely, the negative electrode current collector film, the negative electrode multilayer formed by stacking a negative electrode active region with a negative electrode concave blank area on the surface of the negative electrode current collector film, and the negative electrode sheet including a negative electrode tab formed by die cutting.

[0067] Figure 3 is a schematic diagram of a solid-state battery cell according to an embodiment of this application.

[0068] Figure 4 is an exploded view of a solid-state battery cell according to an embodiment of this application, as shown in Figure 3.

[0069] Figure 5 is a schematic diagram of a battery module according to one embodiment of this application.

[0070] Figure 6 is a schematic diagram of a battery pack according to one embodiment of this application.

[0071] Figure 7 is an exploded view of the battery pack of one embodiment of this application shown in Figure 6.

[0072] Figure 8 is a schematic diagram of an electrical device using a solid-state battery as a power source according to an embodiment of this application.

[0073] Explanation of reference numerals in the attached figures: 10, positive electrode layer; 20, solid electrolyte layer; 30, negative electrode layer; 1300, positive electrode tab; 1302, first composite groove; 3300, negative electrode tab; 3302, second composite groove; X is the X direction; Y is the Y direction; Z is the Z direction; 100, positive electrode sheet; 111, positive electrode current collector membrane; 120, positive electrode active region; 121, positive electrode concave blank region; 130, positive electrode tab; 122, positive electrode tab 1. Groove; 124. First empty groove; 300. Negative electrode sheet; 311. Negative electrode current collector film; 320. Negative electrode active area; 321. Negative electrode concave blank area; 330. Negative electrode tab; 322. Negative electrode tab groove; 324. Second empty groove; 1. Battery pack; 2. Upper casing; 3. Lower casing; 4. Battery module; 5. Solid-state battery cell; 51. Housing; 52. Solid-state battery cell; 53. Cover plate; 6. Electrical device. Detailed Implementation

[0074] Hereinafter, some embodiments of the solid-state battery cell, solid-state battery cell, solid-state battery, and power-consuming device of this application are described in detail with appropriate reference to the accompanying drawings. However, some unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repetitive descriptions of actually identical structures may be omitted. This is to avoid making the following description unnecessarily lengthy and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand this application and are not intended to limit the subject matter of the claims.

[0075] The "range" disclosed in this application can be defined in the form of a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints; any endpoint can be independently included or excluded, and they can be combined arbitrarily, meaning any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for a specific parameter, it is expected that ranges of 60-110 and 80-120 are also included. Furthermore, if minimum range values ​​1 and 2 are listed, and maximum range values ​​3, 4, and 5 are also listed, then the following ranges are all expected: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In this application, unless otherwise stated, the numerical range "ab" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0-5" indicates that all real numbers between "0-5" have been listed in this article; "0-5" is simply a shortened representation of these numerical combinations. Furthermore, when describing a parameter as an integer ≥2, it is equivalent to listing integers such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc. For instance, when describing a parameter as an integer selected from "2-10", it is equivalent to listing the integers 2, 3, 4, 5, 6, 7, 8, 9, and 10.

[0076] In this application, the terms "multiple," "various," "multiple items," "several," etc., unless otherwise specified, refer to a quantity greater than or equal to 2. For example, "one or more" means one or more (greater than or equal to) two. It can be understood that when "any number of" items are involved, it refers to any suitable combination of multiple items, that is, a combination of "any number of" items in a manner that does not conflict and enables the implementation of this application.

[0077] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0078] 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 or implementation 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. The term "implementation" as used herein has a similar understanding.

[0079] In this application, open-ended technical features or solutions described using terms such as "containing," "comprising," or "including" do not exclude additional members beyond those listed unless otherwise specified. They can be considered as providing both closed-ended features or solutions comprised of the listed members and open-ended features or solutions that include additional members beyond the listed members. For example, if 'a' includes a1, a2, and a3, it may also include other members or exclude additional members unless otherwise specified. This can be considered as providing both features or solutions where "a consists of a1, a2, and a3" or "a is selected from a1, a2, and a3," and features or solutions where "a includes not only a1, a2, and a3, but also other members."

[0080] In this application, unless otherwise specified, M (e.g., m1) means that m1 is a non-limiting example of M, and it is understood that M is not limited to m1.

[0081] In this application, "optionally," "optionally," and "optional" mean that something is optional, that is, it is selected from either "with" or "without." If multiple "options" appear in a technical solution, unless otherwise specified and there are no contradictions or mutual constraints, each "option" is independent. Unless otherwise specified, the descriptions such as "optionally include" and "optionally contain" in this application, taking "optionally include" as an example, mean "may include or not include."

[0082] In this application, unless otherwise specified, the features or solutions corresponding to "and / or" include any one of two or more of the related listed items, as well as any and all combinations of the related listed items. Any and all combinations include any two related listed items, any more related listed items, or a combination of all related listed items. For example, "M and / or N" represents the group consisting of M, N, and "a combination of M and N". "Containing M and / or N" can mean "containing M, containing N, and containing both M and N", or "containing M, containing N, or containing both M and N", and can be appropriately understood according to the context.

[0083] The terms “combinations of,” “any combination of,” and “any combination of” used in this article include all suitable combinations of any two or more of the listed items.

[0084] In this document, the term "suitable" in phrases such as "suitable combination," "suitable method," and "any suitable method" refers to the technical solution that enables the implementation of this application.

[0085] In this document, terms such as "preferred," "better," "more suitable," "ideal," "good," and "superior" are merely descriptions of more effective implementation methods or embodiments, and should be understood not to limit the scope of protection of this application. If multiple "preferred" terms appear in a technical solution, unless otherwise specified and there are no contradictions or mutual constraints, each "preferred" term shall be independent.

[0086] In this application, terms such as "further," "even more," "especially," "for example," "as," "example," and "exemplary" are used for descriptive purposes to indicate differences in content, but should not be construed as limiting the scope of protection of this application.

[0087] In this application, the terms "first aspect," "second aspect," "third aspect," "fourth aspect," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or quantity, nor should they be construed as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first," "second," "third," "fourth," etc., serve only as a non-exhaustive enumeration and should be understood not to constitute a closed limitation on quantity.

[0088] In the description of this application, it should be understood that the terms "length", "width", "thickness", "height", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing 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, and therefore should not be construed as a limitation of this application.

[0089] In this application, unless otherwise expressly specified and limited, the terms "connected," "linked," etc., should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral part. Those skilled in the art can understand the meaning of the above terms in this application according to the circumstances.

[0090] In this application, unless otherwise expressly specified and limited, the phrase "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In this application, unless otherwise expressly specified and limited, the phrase "above" or "below" the second feature can indicate a horizontal positional relationship, or it can simply indicate the existence of an attachment relationship without specifying a horizontal positional relationship.

[0091] In this application, the term "room temperature" generally refers to 4℃ to 35℃, and may refer to 20℃ ± 5℃. In some embodiments or examples of this application, room temperature refers to 20℃ to 30℃.

[0092] In this application, when a unit is specified for a data range, if the unit is only followed by the right endpoint, it indicates that the units for the left and right endpoints are the same. For example, 3~5mm or 3-5mm both mean that the units for the left endpoint "3" and the right endpoint "5" are both mm (millimeters), and both have the same meaning as 3mm~5mm. Furthermore, similar descriptions of other parameters such as temperature and size are interpreted in the same way.

[0093] In this application, "greater than or equal to", "greater than or equal to", and "≥" have the same meaning and can be used interchangeably; "less than or equal to", "less than or equal to", and "≤" have the same meaning and can be used interchangeably; "greater than" can be equivalently represented as ">", and "less than" can be equivalently represented as "<". In this application, unless otherwise specified, "greater than or equal to" and "≥" can be considered as providing two additional solutions: "greater than" and "equal to". In this application, unless otherwise specified, "less than or equal to" and "≤" can be considered as providing two additional solutions: "less than" and "equal to".

[0094] In this application, the exemplary descriptions such as "in some implementations (or embodiments)" and "in one implementation (or embodiment)" may cover, but are not limited to, the following meanings: these solutions can be combined with other solutions in a suitable manner to form new technical solutions.

[0095] Unless otherwise stated, the improvements described in this application are not intended to be limited to any theoretical aspects.

[0096] In traditional solid-state batteries, the die-cut flexible tabs are located outside the active material layer of the electrode. After assembly into a cell, the flexible tabs suspend outside the active area of ​​the electrode. To allow for the connection of rigid tabs after multiple flexible tabs are attached together in the casing, a certain amount of internal space needs to be reserved for the flexible tabs. After the electrode assembly is packaged into the casing, the flexible tabs occupy a certain height space, resulting in a gap between the top of the electrode and the bottom of the casing. The area outside the tabs corresponding to this gap is usually empty, leading to fixed losses within the casing space. In addition, the sides of the flexible tabs are prone to cracking due to stress, increasing the cell impedance and affecting cell performance.

[0097] In this application, the "soft tab" can be obtained by die-cutting the current collector in the electrode sheet, thereby obtaining a current collector layer that matches the position of the electrode active material layer. That is, the soft tab and the current collector layer in the electrode sheet can be integrated. However, this is not a limitation. Non-limitingly, the material of the soft tab can be the same as the material of the corresponding current collector layer. In some non-limiting embodiments, the soft tab and the current collector layer can come from the same membrane material, with at least a portion forming the current collector layer and at least another portion forming the soft tab. In this case, the soft tab and the current collector layer in the electrode sheet can be integrated.

[0098] In this application, unless otherwise specified, "hard tab" refers to the tab section located outside the battery casing, a metallic conductor used to lead the positive and negative electrodes out of the cell. Without limitation, the hard tab of the positive electrode may be made of aluminum, and the hard tab of the negative electrode may be made of nickel.

[0099] Based on this, this application provides a solid-state battery cell, a solid-state battery cell, a solid-state battery, and an electrical device. The solid-state battery cell can be used to improve the energy density of a battery.

[0100] In some embodiments, the solid-state battery cell includes a positive electrode portion, a solid electrolyte portion, and a negative electrode portion stacked together, with the positive electrode portion and the negative electrode portion being isolated by the solid electrolyte portion; the positive electrode portion includes a positive electrode body and a positive electrode tab connected to the positive electrode body, and the negative electrode portion includes a negative electrode body and a negative electrode tab connected to the negative electrode body; at least one edge extending along the width direction of the solid-state battery cell is provided with a first composite groove and a second composite groove, the first composite groove being used to accommodate at least a portion of the positive electrode tab, and the second composite groove being used to accommodate at least a portion of the negative electrode tab.

[0101] At this point, in the width direction of the solid-state cell, an active extension region is provided in the space outside the positive and negative electrode tabs. This solid-state cell can be used to improve the volumetric energy density of the battery.

[0102] Unless otherwise specified, the term "solid-state battery" as used in this application refers to a battery in which the electrolyte includes a solid electrolyte. Typically, a solid-state battery includes a positive electrode, a solid electrolyte, and a negative electrode. During charging and discharging, active ions repeatedly insert and extract between the positive and negative electrodes. The solid electrolyte acts as a conductor of ions between the positive and negative electrodes and also isolates them, preventing short circuits. Therefore, a separator, as found in traditional lithium-ion batteries, is not required in solid-state batteries. Solid-state batteries use a non-flammable solid electrolyte instead of the organic electrolyte in traditional liquid lithium-ion batteries, significantly improving battery safety. In addition to enhanced safety, solid-state batteries are better suited for high-energy-density positive and negative electrode materials and reduce system weight, thus facilitating improvements in energy density.

[0103] In this application, unless otherwise specified, "solid electrolyte section" refers to a structural section that includes a solid electrolyte. The solid electrolyte section includes at least one solid electrolyte layer, and the number of solid electrolyte layers matches the number of electrode layers in the electrode section.

[0104] In this application, unless otherwise specified, "solid electrolyte" refers to an electrolyte material or substance that exists in solid form during the storage and fabrication of solid-state batteries and their components, as well as during the operation of solid-state batteries. This includes, but is not limited to, solid electrolytes existing in solid form at room temperature.

[0105] In this application, unless otherwise specified, the "electrode portion" includes a positive electrode portion and a negative electrode portion. The positive electrode portion includes a positive electrode body and a positive electrode tab connected to the positive electrode body, and the negative electrode portion includes a negative electrode body and a negative electrode tab connected to the negative electrode body.

[0106] In this application, unless otherwise specified, the "electrode portion" includes an electrode body and a tab connected to the electrode body. The "electrode body" can be a positive electrode body or a negative electrode body. The electrode body in the positive electrode portion is a positive electrode body, and the electrode body in the negative electrode portion is a negative electrode body.

[0107] In this application, unless otherwise specified, an "electrode body" includes at least one electrode layer, and may include one or more electrode layers; the number of layers in the electrode body is consistent with the number of electrode layers in the electrode body. An "electrode body" can be a positive electrode body or a negative electrode body. A positive electrode body includes at least one positive electrode layer, and may include one or more positive electrode layers; the number of layers in the positive electrode body is consistent with the number of positive electrode layers in the positive electrode body. A negative electrode body includes at least one negative electrode layer, and may include one or more negative electrode layers; the number of layers in the negative electrode body is consistent with the number of positive electrode layers in the positive electrode body.

[0108] In this application, unless otherwise specified, a solid electrolyte layer is disposed between any adjacent positive and negative electrode layers. Therefore, the number of solid electrolyte layers in the solid electrolyte section matches the number of electrode layers in the electrode section.

[0109] Typically, a solid-state battery consists of a positive electrode layer, a solid electrolyte layer, and a negative electrode layer. During charging and discharging, active ions move back and forth between the positive and negative electrode layers, inserting and extracting. The solid electrolyte layer acts as a conductor of ions between the positive and negative electrode layers and also isolates them, thus preventing short circuits between the positive and negative electrodes.

[0110] In some embodiments, each electrode layer independently includes a current collector layer and an electrode active material layer located on at least one side of the current collector layer. In some embodiments, each positive electrode layer independently includes a positive current collector layer and a positive active material layer located on at least one side of the positive current collector layer, and each negative electrode layer independently includes a negative current collector layer and a negative active material layer located on at least one side of the negative current collector layer.

[0111] In this application, unless otherwise specified, "electrode active material layer" includes at least one of the positive electrode active material layer in the positive electrode layer and the negative electrode active material layer in the negative electrode layer. Depending on the specific circumstances, the electrode active material layer may refer to either the positive electrode active material layer or the negative electrode active material layer. It is understood that the positive electrode active material layer contains positive electrode active material, and the negative electrode active material layer contains negative electrode active material.

[0112] In this application, unless otherwise specified, "electrode portion" can be either a positive electrode portion or a negative electrode portion. The electrode portion in the positive electrode portion is the positive electrode portion, and the positive electrode portion is connected to the positive electrode body. The electrode portion in the negative electrode portion is the negative electrode portion, and the negative electrode portion is connected to the negative electrode body.

[0113] In this application, unless otherwise specified, a "tab portion" independently includes at least one tab, and each "tab" is independently connected to the current collector layer of the corresponding electrode layer. A positive tab portion includes at least one positive tab, which is connected to the positive current collector layer of the corresponding positive electrode layer. A negative tab portion includes at least one negative tab, which is connected to the negative current collector layer of the corresponding negative electrode layer. Each electrode layer may or may not have tabs, but at least one positive electrode body is connected to a positive tab, and at least one negative electrode body is connected to a negative tab.

[0114] It is understandable that the connection between the tab and the corresponding electrode body is at least a physical connection, and an electrical connection can also be achieved during battery cycling.

[0115] In this application, unless otherwise specified, "electrode layer" includes electrode active material. The electrode layer can be a positive electrode layer or a negative electrode layer. "Electrode active material" in the electrode layer refers to a material capable of reversibly inserting and extracting active ions. Unless otherwise specified, "negative electrode active material" refers to a material used in the negative electrode layer capable of reversibly inserting and extracting active ions; "positive electrode active material" refers to a material used in the positive electrode layer capable of reversibly extracting and inserting active ions. During solid-state battery charging, active ions are extracted from the positive electrode, pass through the solid electrolyte layer, and insert into the negative electrode; while during solid-state battery discharging, active ions are extracted from the negative electrode and insert into the positive electrode. The active ions are not particularly limited; non-limitingly, the active ions can be lithium ions, corresponding to a lithium-ion solid-state battery.

[0116] In one aspect, this application provides a solid-state battery cell having an active extended region. This solid-state battery cell can be used to improve the energy density of a battery.

[0117] In this application, unless otherwise specified, the height direction of the solid-state battery cell is denoted as the Y direction, the width direction as the X direction, and the thickness direction as the Z direction; the X, Y, and Z directions are perpendicular to each other.

[0118] In some embodiments, this application provides a solid-state battery cell, which includes a positive electrode portion, a solid electrolyte portion and a negative electrode portion stacked together, wherein the positive electrode portion and the negative electrode portion are isolated by the solid electrolyte portion; the positive electrode portion includes a positive electrode body and a positive electrode tab connected to the positive electrode body, and the negative electrode portion includes a negative electrode body and a negative electrode tab connected to the negative electrode body;

[0119] At at least one edge extending along the X direction, the solid-state battery cell is provided with two composite grooves, referred to as the first composite groove and the second composite groove, respectively; the first composite groove is used to accommodate at least a portion of the positive electrode tab, and the second composite groove is used to accommodate at least a portion of the negative electrode tab.

[0120] In this application, unless otherwise specified, in a solid-state battery cell, the active region that is highly aligned with the first composite groove and the second composite groove in the Y direction and located outside the first composite groove and the second composite groove in the X direction is referred to as the "active extension region".

[0121] In this application, unless otherwise specified, "active region" refers to the area in a solid-state battery cell where the electrode active material layer is disposed, projected along the Z-direction. Unless otherwise specified, both the positive electrode body and the negative electrode body correspond to the active region, with the positive electrode body corresponding to the positive active region and the negative electrode body corresponding to the negative electrode body region. Unless otherwise specified, the active region of a solid-state battery cell corresponds to the area other than the positive and negative electrode tabs, projected along the Z-direction.

[0122] In this application, unless otherwise stated, along the X direction, due to the presence of the first composite groove and the second composite groove, the active region of the solid-state battery cell has a concave shape at the corresponding edge.

[0123] In this application, unless otherwise specified, "stacked arrangement" is used to describe the positional relationship of multiple layered structures, meaning that multiple layered structures are stacked along their respective thickness directions. Those skilled in the art will understand its meaning. For example, "including stacked structural layer A and structural layer B" means that the stacking direction of structural layer A and structural layer B is along their respective thickness directions; that is, the thickness direction of structural layer A and the thickness direction of structural layer B are consistent or substantially consistent. It is understood that other intermediate structural layers are permitted to be disposed between structural layer A and structural layer B.

[0124] In this application, unless otherwise specified, the term "composite groove" can refer to a first composite groove, a second composite groove, or a combination of a first composite groove and a second composite groove. It can be appropriately understood in conjunction with the descriptive style. For example, "two composite grooves" refers to a combination of a first composite groove and a second composite groove.

[0125] In this application, unless otherwise specified, "first composite groove" refers to a groove in a solid-state battery cell for accommodating at least a portion of the positive electrode tab. At least a portion of the positive electrode tab is located within the concave region provided by the first composite groove. Unless otherwise specified, the positive electrode tab is connected to the positive electrode body at the bottom of the first composite groove. "Bottom of the first composite groove" refers to the side of the first composite groove furthest from the opening in the Y direction, which is also the top of the positive electrode body closest to the first composite groove in the Y direction at that location. Unless otherwise specified, the positive electrode tab is not connected to the side edges of the first composite groove, allowing the positive electrode tab to move in a direction perpendicular to the X direction.

[0126] In this application, unless otherwise specified, "second composite groove" refers to a groove in a solid-state battery cell for accommodating at least a portion of the negative electrode tab. At least a portion of the negative electrode tab is located within the recessed area provided by the second composite groove. Unless otherwise specified, the negative electrode tab is connected to the negative electrode body at the bottom of the second composite groove. "Bottom of the second composite groove" refers to the side of the second composite groove furthest from the opening in the Y direction, which is also the top of the negative electrode body closest to the second composite groove in the Y direction at that location. Unless otherwise specified, the negative electrode tab is not connected to the side edges of the second composite groove, allowing the negative electrode tab to move in a direction perpendicular to the X direction.

[0127] In the application, the terms "first" and "second" in "first composite groove" and "second composite groove" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or quantity, nor should they be construed as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first" and "second" serve only as a non-exhaustive enumeration and should be understood not to constitute a closed limitation on quantity.

[0128] In this application, unless otherwise specified, the "active extension region" is a part of the solid-state battery cell. The active extension region is an active area where an electrode active material layer is disposed. The active extension region is at the same height as the first composite groove and the second composite groove in the height direction (Y direction) of the solid-state battery cell. The active extension region is divided into discontinuous regions by the first composite groove and the second composite groove in the width direction (X direction) of the solid-state battery cell. The side contours of the first composite groove and the second composite groove extending along the Y direction are provided by the adjacent active extension regions. The "active extension region" can also be described as a height region of the solid-state battery cell where two composite grooves are disposed in the Y direction.

[0129] This solid-state battery cell features a first composite groove at the positive electrode tab, allowing it to bend inwards, and a second composite groove at the negative electrode tab, also allowing it to bend inwards. An active extension region is formed in the area outside the first and second composite grooves along the width of the solid-state battery cell, at the same height as these grooves. In other words, along the width of the solid-state battery cell, an active extension region with the same height as the first and second composite grooves is provided in the space outside the positive and negative electrode tabs. This allows the solid-state battery cell to better utilize the space at the tabs, significantly increasing the volumetric energy density of the electrodes and thus improving the overall volumetric energy density of the solid-state battery. The two composite grooves also provide protection for the tabs, reducing the risk of tab breakage.

[0130] In some embodiments, the height of the positive electrode body at the active extension region is higher than the height of the positive electrode body at the first composite groove, and the height of the negative electrode body at the active extension region is higher than the height of the negative electrode body at the second composite groove. In this case, the solid-state cell can make better use of the space at the tabs, thereby significantly increasing the space volume occupied by the electrode portion in the solid-state cell, and significantly improving the volumetric energy density of the solid-state cell and solid-state battery.

[0131] In some embodiments, this application provides a solid-state battery cell, which includes a positive electrode portion, a solid electrolyte portion and a negative electrode portion stacked together, wherein the positive electrode portion and the negative electrode portion are isolated by the solid electrolyte portion; the positive electrode portion includes a positive electrode body and a positive electrode tab connected to the positive electrode body, and the negative electrode portion includes a negative electrode body and a negative electrode tab connected to the negative electrode body;

[0132] At at least one edge extending along the X direction, the solid-state battery cell is provided with two composite grooves, referred to as the first composite groove and the second composite groove, respectively; the first composite groove is used to accommodate at least a portion of the positive electrode tab, and the second composite groove is used to accommodate at least a portion of the negative electrode tab;

[0133] The height region in the solid-state battery cell with two composite grooves in the Y direction is denoted as the active extension region, and the maximum height of the active extension region in the Y direction is denoted as H. Δ Satisfying H Δ >0.

[0134] In this application, unless otherwise specified, the height of the positive electrode body in the Y direction is denoted as H. P Let H be the height of the negative electrode body in the Y direction. N The height of the solid-state battery cell in the Y direction is denoted as H0.

[0135] In some implementations, H P >(H0-H Δ ).

[0136] In some implementations, H N >(H0-H Δ ).

[0137] In some implementations, H P >(H0-H Δ And H N >(H0-H Δ ).

[0138] In some embodiments, this application provides a solid-state battery cell, which includes a positive electrode portion, a solid electrolyte portion and a negative electrode portion stacked together, wherein the positive electrode portion and the negative electrode portion are isolated by the solid electrolyte portion; the positive electrode portion includes a positive electrode body and a positive electrode tab connected to the positive electrode body, and the negative electrode portion includes a negative electrode body and a negative electrode tab connected to the negative electrode body;

[0139] The height direction of a solid-state battery cell is denoted as the Y direction, the width direction as the X direction, and the thickness direction as the Z direction; the X, Y, and Z directions are perpendicular to each other.

[0140] At at least one edge extending along the X direction, the solid-state battery cell is provided with two composite grooves, referred to as the first composite groove and the second composite groove, respectively; the first composite groove is used to accommodate at least a portion of the positive electrode tab, and the second composite groove is used to accommodate at least a portion of the negative electrode tab;

[0141] Let H be the height of the positive electrode body in the Y direction. P The height of the negative electrode body in the Y direction is denoted as H. N The height of the solid-state battery cell in the Y direction is denoted as H0; the height region of the solid-state battery cell with two composite grooves in the Y direction is denoted as the active extension region, and the maximum height of the active extension region in the Y direction is denoted as H. Δ Satisfying H Δ >0;

[0142] In some of these implementations, H P >(H0-H Δ And H N >(H0-H Δ ).

[0143] In this application, unless otherwise specified, "the height of the positive electrode body in the Y direction" refers to the maximum height of the positive electrode body in the Y direction. In some embodiments, the height of the positive electrode body in the Y direction is equal to the sum of the height of the positive electrode body at the first composite groove and the height of the first composite groove.

[0144] In this application, unless otherwise specified, "the height of the negative electrode body in the Y direction" refers to the maximum height of the negative electrode body in the Y direction. In some embodiments, the height of the negative electrode body in the Y direction is equal to the sum of the height of the negative electrode body at the second composite groove and the height of the second composite groove.

[0145] In this application, unless otherwise specified, "height of solid-state cell in the Y direction" refers to the maximum height of the electrode body in the Y direction. Unless otherwise specified, "height of solid-state cell in the Y direction" does not include the height of the tab.

[0146] In this application, unless otherwise specified, the "maximum height of the active extension region in the Y direction" is consistent with the maximum depth of the first composite groove and the second composite groove in the Y direction.

[0147] Solid-state cells have a certain length of extension in the X direction and a certain height of extension in the Y direction. The two top edges of a solid-state cell with a certain distance between them in the Y direction can be referred to as "the two sides of the solid-state cell extending in the X direction" or "the two sides of the solid-state battery in the Y direction".

[0148] In this application, unless otherwise specified, "the solid-state cell has two composite grooves at at least one edge extending along the X direction" and "the solid-state cell has two composite grooves at at least one edge in the Y direction" have the same meaning and can be used interchangeably.

[0149] In this application, "the solid-state cell has two composite grooves at at least one edge extending along the X direction" means that the solid-state cell has two composite grooves, and these two composite grooves are located on the same edge extending along the X direction of the solid-state cell, or on different edges extending along the X direction of the solid-state cell. That is, the two composite grooves can be located on the same side of the solid-state cell in the Y direction, or on different sides of the solid-state cell in the Y direction. In the non-limiting embodiment shown in FIG1, the first composite groove and the second composite groove are located on the same edge extending along the X direction of the solid-state cell.

[0150] When the two composite grooves are located on different sides of the solid-state cell in the Y direction, the positive electrode tab and the negative electrode tab are located on different sides of the solid-state cell. At this time, by setting an active extension region in the solid-state cell, the improvement effect on volumetric energy density is more significant.

[0151] In some embodiments, the first composite groove and the second composite groove are located on the same edge of the solid-state cell extending along the X direction. That is, in the Y direction, the first composite groove and the second composite groove are located on the same side of the solid-state cell.

[0152] In some embodiments, the first composite groove and the second composite groove are located at different side edges of the solid-state cell extending along the X direction. That is, in the Y direction, the first composite groove and the second composite groove are located on different sides of the solid-state cell.

[0153] In some implementations, H N It is equal to H0. At this point, the space at the tab can be used to the maximum extent to set the electrode active material layer, thereby maximizing the volumetric energy density of the solid-state cell and solid-state battery.

[0154] The utilization rate ψ of the active extension region in the Y direction can be increased. Y =H Δ / H0×100%.

[0155] In some implementations, the solid-state battery cell satisfies one or more of the following characteristics:

[0156] H Δ ≥0.05mm, optionally, 0.05mm≤H Δ ≤1mm;

[0157] ψ Y ≥0.05%, optionally, ψ Y ≥0.1%, and further optionally, 0.1% ≤ ψ Y ≤2%.

[0158] Without limitation, H Δ ≥0.05mm, optionally, 0.05mm≤H Δ ≤1mm. Non-limitingly, H Δ It can also be any of the following values, or a range consisting of any two of the following values: 0.05mm, 0.06mm, 0.08mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.4mm, 0.5mm, 0.6mm, 0.8mm, 0.9mm, 1.0mm, 1mm, etc.

[0159] Without restriction, ψ Y ≥0.05%, optionally, ψ Y ≥0.1%, and further optionally, 0.1% ≤ ψ Y ≤2%. Without limitation, ψ Y It can also be any of the following percentages, or an interval selected from any two of the following percentages: 0.05%, 0.06%, 0.08%, 0.1%, 0.2%, 0.4%, 0.5%, 0.6%, 0.8%, 1%, 1.2%, 1.4%, 1.5%, 1.6%, 1.8%, 2%, etc. Non-restrictively, ψ Y It can also be any of the following ranges: 0.05% ≤ ψY ≤2%, etc.

[0160] By using the height parameter h of the active extension region Δ and utilization parameter ψ Y One or two of the aforementioned adjustments are beneficial for better utilizing the space in the height direction at the pole position.

[0161] The width of the solid-state cell in the X direction can be denoted as W0, and the width of the active extension region in the X direction can be denoted as W. Δ The utilization rate ψ of the active extension region in the X direction X =W Δ / W0×100%.

[0162] In some implementations, the solid-state battery cell satisfies one or more of the following characteristics:

[0163] W Δ ≥50mm, optional, 50mm≤W Δ ≤1000mm;

[0164] ψ X ≥60%, optionally, ψ X ≥70%, and optionally, 70% ≤ψ X ≤95%.

[0165] Without limitation, W Δ ≥50mm, optional, 50mm≤W Δ ≤1000mm. Non-limitingly, W Δ It can also be any of the following values, or a range consisting of any two of the following values: 50mm, 60mm, 80mm, 100mm, 120mm, 150mm, 200mm, 250mm, 300mm, 400mm, 500mm, 600mm, 700mm, 800mm, 900mm, 1000mm, etc.

[0166] Without restriction, ψ X ≥60%, optionally, 60% ≤ψ X ≤95%. (Unrestricted, ψ) X It can also be any of the following percentages, or an interval selected from any two of the following percentages: 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, etc., for example, ψ X Selectable from the following range: ψ X ≥70%, 70%≤ψ X ≤95%, etc.

[0167] By adjusting the width parameter w of the active extension region Δand utilization parameter ψ X One or two of the aforementioned adjustments are beneficial for better utilizing the space in the width direction at the electrode position.

[0168] In this application, the projected area of ​​the solid-state cell along the Z direction is denoted as A0, and the projected area of ​​the active extension region along the Z direction is denoted as A. Δ The two-dimensional utilization rate ψ of the active extension region A =A Δ / A0×100%.

[0169] In this application, unless otherwise specified, "projected area of ​​solid-state cell along the Z direction" refers to the projected area of ​​the electrode body portion along the Z direction, excluding the projected area of ​​the tab portion along the Z direction.

[0170] In some implementations, solid-state cells satisfy: ψ A ≥0.04%.

[0171] In some implementations, solid-state cells satisfy: ψ A ≥0.05%.

[0172] In some implementations, the solid-state cell satisfies: 0.04% ≤ ψ A ≤1.5%.

[0173] Without restriction, ψ A It can also be any of the following percentages, or an interval selected from any two of the following percentages: 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.1%, 0.15%, 0.16%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.2%, 1.4%, 1.5%, etc., for example, ψ A The following ranges can be selected: 0.05%–1.5%, 0.06%–1.5%, 0.1%–1.5%, 0.15%–1.5%, 0.04%–1.2%, 0.05%–1.2%, 0.06%–1.2%, 0.1%–1.2%, 0.15%–1.2%, 0.16%–1.5%, 0.16%–1.2%, etc.

[0174] By increasing the two-dimensional utilization rate ψ of the active extension region A Within the aforementioned range, adjustments are beneficial for better utilization of the unused space at the electrode tabs. It is understandable that, compared to solid-state cells without an active extension region, the percentage increase in volumetric energy density of solid-state cells with an active extension region is typically higher than ψ. A .

[0175] In some embodiments, the length of the positive electrode tab in the Y direction in its extended state is greater than the height of the first composite groove in the Y direction. In some embodiments, the positive electrode tab includes a positive electrode tab bend located within the first composite groove.

[0176] In some embodiments, the length of the negative electrode tab in the Y direction in its extended state is greater than the height of the second composite groove in the Y direction. In some embodiments, the negative electrode tab includes a negative electrode tab bend located within the second composite groove.

[0177] In some embodiments, the length of the positive electrode ear in the extended state in the Y direction is greater than the height of the first composite groove in the Y direction, and the length of the negative electrode ear in the extended state in the Y direction is greater than the height of the second composite groove in the Y direction.

[0178] In some embodiments, the positive electrode ear includes a positive electrode ear bend located within a first composite groove; the negative electrode ear includes a negative electrode ear bend located within a second composite groove.

[0179] In some embodiments, the positive electrode tab includes a positive electrode tab bend located within the first composite groove, and the length of the positive electrode tab in the Y direction in the extended state is greater than the height of the first composite groove in the Y direction.

[0180] The negative electrode ear includes a bent portion of the negative electrode ear located within the second composite groove, and the length of the negative electrode ear in the Y direction in the extended state is greater than the height of the second composite groove in the Y direction.

[0181] By reserving a certain extension height for the positive or negative tab, it is convenient to use it as a soft tab for subsequent transition to a hard tab. At least a portion of the positive and / or negative tabs in the solid-state cell can be bent inward into the corresponding composite groove. With sufficient height reserved for the positive and negative tabs, it is beneficial to further increase the volume occupancy of the electrode portion in the solid-state cell, which can significantly improve the volumetric energy density of the solid-state cell and solid-state battery.

[0182] In this application, the extension height of the positive electrode ear in the Y direction is denoted as H. PJ When the positive and negative electrode tabs are located on the same side of the solid-state cell in the height direction, in some embodiments, H PJ ≥H Δ Optionally, H PJ >H Δ .

[0183] In this application, the extension height of the negative electrode ear in the Y direction is denoted as H. NJ When the positive and negative electrode tabs are located on the same side of the solid-state cell in the height direction, in some embodiments, H NJ≥H Δ Optionally, H NJ >H Δ .

[0184] In the process of preparing positive or negative electrode sheets, when coating the electrode paste onto the corresponding current collector film, by controlling the coating height in the Y direction to be less than the height of the current collector film, after drying and die-cutting, the extension height of the formed tab can be greater than the corresponding groove height. It can be understood that when a positive electrode sheet is prepared using a positive electrode paste and a positive current collector film, a positive tab is formed at the positive tab groove; similarly, when a negative electrode sheet is prepared using a negative electrode paste and a negative current collector film, a negative tab is formed at the negative tab groove.

[0185] In this application, unless otherwise specified, "the extension height of the electrode" refers to the height of the electrode in the Y direction when it is in the extended state.

[0186] In some embodiments, the width of the positive electrode tab in the X direction is smaller than the width of the first composite groove in the X direction.

[0187] In some embodiments, the width of the negative electrode ear in the X direction is smaller than the width of the second composite groove in the X direction.

[0188] In some embodiments, the width of the positive electrode tab in the X direction is smaller than the width of the first composite groove in the X direction; the width of the negative electrode tab in the X direction is smaller than the width of the second composite groove in the X direction.

[0189] By leaving a certain gap on both sides of the corresponding electrode tab at the composite groove, a suitable space for movement of the electrode tab can be reserved, and the positive and negative electrode tabs can be bent into the composite groove more easily.

[0190] In some embodiments, in the X direction, there is a gap between the positive electrode ear and the two side edges of the first composite groove, and a gap between the negative electrode ear and the two side edges of the second composite groove. Non-limiting, the width of any gap in the X direction can be independently 10 μm to 5000 μm, and can be independently selected from 0.1 mm to 1 mm, but is not limited thereto. The width of any gap in the X direction can be independently any of the following values ​​or selected from any two of the following values: 10 μm, 50 μm, 100 μm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.5 mm, 2 mm, 3 mm, 4 mm, etc., for example, selected from the following ranges: 0.2 mm to 1 mm, 0.15 mm to 1 mm, 0.3 mm to 1 mm, 0.2 mm to 0.5 mm, 0.15 mm to 0.5 mm, 0.3 mm to 0.5 mm, etc.

[0191] By controlling the size of the gap within a suitable range, it is possible to prevent the positive and negative electrodes from rubbing against adjacent structural layers in different states, while also maximizing the proportion of the extended active area.

[0192] In some implementations, the solid-state battery cell has a stacked structure.

[0193] Without limitation, the size of solid-state battery cells can be any of the sizes known to be applicable in various fields, including but not limited to the size specifications of battery products such as button batteries and laptop batteries.

[0194] In some embodiments, the solid electrolyte section includes at least one solid electrolyte layer. It is understood that a solid electrolyte layer is disposed between any adjacent positive and negative electrode layers. Therefore, the number of solid electrolyte layers in the solid electrolyte section matches the number of electrode layers in the electrode section.

[0195] In some embodiments, the positive electrode body includes at least one positive electrode layer, each positive electrode layer having a groove corresponding to the first composite groove and the second composite groove respectively, and a positive electrode tab is provided at the groove corresponding to the first composite groove in the at least one positive electrode layer.

[0196] The negative electrode body includes at least one negative electrode layer, each negative electrode layer having a groove corresponding to the second composite groove and the first composite groove respectively, and a negative electrode tab is provided at the groove corresponding to the second composite groove in the at least one negative electrode layer.

[0197] The solid electrolyte section includes at least one solid electrolyte layer, and any adjacent positive electrode layer and negative electrode layer are isolated by the solid electrolyte layer; each solid electrolyte layer has a hollow groove corresponding to the first composite groove and the second composite groove respectively.

[0198] In this application, unless otherwise specified, the groove in the positive electrode layer corresponding to the first composite groove is referred to as the "positive electrode tab groove". The positive electrode tab groove may be provided with a positive electrode tab or be an empty groove, but at least one positive electrode tab groove is provided with a positive electrode tab. It can be understood that the grooves in the positive electrode layer corresponding to the second composite groove are all empty grooves.

[0199] In this application, unless otherwise specified, the groove in the negative electrode layer corresponding to the second composite groove is referred to as the "negative electrode tab groove". The negative electrode tab groove may be provided with a negative electrode tab or be an empty groove, but at least one negative electrode tab groove is provided with a negative electrode tab. It can be understood that the grooves in the negative electrode layer corresponding to the first composite groove are all empty grooves.

[0200] In this application, unless otherwise specified, "empty groove" includes grooves in the electrode layer where no tabs are provided, and also grooves in the solid electrolyte layer corresponding to the two composite grooves. The empty grooves involved in this application include at least a first empty groove in the positive electrode layer corresponding to the second composite groove, a second empty groove in the negative electrode layer corresponding to the first composite groove, a fourth empty groove in the solid electrolyte layer corresponding to the first composite groove, and a third empty groove in the solid electrolyte layer corresponding to the second composite groove.

[0201] In some embodiments, the positive electrode body includes at least one positive electrode layer, each positive electrode layer independently includes a positive electrode current collector layer and a positive electrode active material layer located on at least one side of the positive electrode current collector layer, each positive electrode layer has a positive electrode tab groove, all the positive electrode tab grooves in the positive electrode body together constitute part of a first composite groove, the positive electrode current collector layer in the at least one positive electrode layer is connected to a positive electrode tab at the corresponding positive electrode tab groove, and all the positive electrode tabs connected to the positive electrode body together constitute at least part of the positive electrode tab portion;

[0202] The negative electrode body includes at least one negative electrode layer. Each negative electrode layer independently includes a negative electrode current collector layer and a negative electrode active material layer located on at least one side of the negative electrode current collector layer. Each negative electrode layer has a negative electrode tab groove. All negative electrode tab grooves in the negative electrode body together constitute part of a first composite groove. The negative electrode current collector layer in the at least one negative electrode layer is connected to a negative electrode tab at the corresponding negative electrode tab groove. All negative electrode tabs connected to the negative electrode body together constitute at least part of the negative electrode tab portion.

[0203] In this application, unless otherwise specified, "positive electrode tab groove" refers to the groove in the positive electrode layer corresponding to the position of the positive electrode tab. For any positive electrode layer, a positive electrode tab may or may not be provided at the positive electrode tab groove, as long as the number of positive electrode tabs connected to all positive electrode layers is greater than or equal to 1.

[0204] In this application, unless otherwise specified, "negative electrode tab groove" refers to the groove in the negative electrode layer corresponding to the position of the negative electrode tab. For any negative electrode layer, a negative electrode tab may or may not be provided at the negative electrode tab groove, as long as the number of negative electrode tabs connected to all negative electrode layers is greater than or equal to 1.

[0205] In the thickness direction of the positive electrode layer, the positive electrode active material layer can be located on at least one side of the positive electrode current collector layer. The positive electrode active material layer can be located on only one side of the positive electrode current collector layer, or it can be located on both sides of the positive electrode current collector layer. In some embodiments, the thickness direction of the positive electrode layer is consistent with the Z-direction.

[0206] In the thickness direction of the negative electrode layer, the negative electrode active material layer may be located on at least one side of the negative electrode current collector layer. The negative electrode active material layer may be located on only one side of the negative electrode current collector layer, or it may be located on both sides of the negative electrode current collector layer. In some embodiments, the thickness direction of the negative electrode layer is consistent with the Z-direction.

[0207] In a non-limiting sense, the positive electrode tab can be made of the same material as the positive electrode current collector layer; furthermore, the positive electrode tab and the positive electrode current collector layer can originate from the same current collector membrane material. This type of positive electrode tab can be classified as a "soft electrode tab".

[0208] In a non-limiting sense, the negative electrode tab can be made of the same material as the negative electrode current collector layer; furthermore, the negative electrode tab and the negative electrode current collector layer can originate from the same current collector membrane material. This type of negative electrode tab can be classified as a "soft electrode tab".

[0209] When the solid-state battery cell adopts the aforementioned stacked structure, at the first composite groove, the positive electrode tab groove on the positive electrode layer, the empty groove on the negative electrode layer, and the empty groove on the solid electrolyte layer can be combined to form a concave space that allows the positive electrode tab to bend inward; at the second composite groove, the negative electrode tab groove on the negative electrode layer, the empty groove on the positive electrode layer, and the empty groove on the solid electrolyte layer can be combined to form a concave space that allows the negative electrode tab to bend inward.

[0210] In some embodiments, all the positive electrode tabs connected to the positive electrode body together constitute at least a part of the positive electrode tab portion. In this case, the positive electrode tab portion may also include a positive electrode hard electrode tab portion.

[0211] In some implementations, all the positive electrode tabs connected to the positive electrode body together constitute the positive electrode tab portion.

[0212] In some embodiments, all the negative electrode tabs connected to the negative electrode body together constitute at least a portion of the negative electrode tab portion. In this case, the negative electrode tab portion may also include a negative electrode hard electrode tab portion.

[0213] In some implementations, all the negative electrode tabs connected to the negative electrode body together constitute the negative electrode tab portion.

[0214] In some implementations, the positive electrode body has a single positive electrode layer; the negative electrode body has a single negative electrode layer.

[0215] In some implementations, the positive electrode body has multiple positive electrode layers; the negative electrode body has the same number of negative electrode layers as the positive electrode body.

[0216] When the number of positive electrode layers in the positive electrode body is multi-layered and the number of negative electrode layers in the negative electrode body is matched with multi-layered, the stacked structure corresponds to a multi-layered stacked structure. In this case, by utilizing the aforementioned active extension region structure design, it is beneficial to gain more volumetric energy density in the tab space.

[0217] Without limitation, the number of positive electrode layers in the positive electrode body can be one or more. The more positive electrode layers in the positive electrode body, the thicker the battery. The appropriate number of positive electrode layers can be selected according to the size requirements of the solid-state battery.

[0218] Based on the number of positive electrode layers in the positive electrode body, the number of positive electrode layers can be one or more. Generally, the number of negative electrode layers in the negative electrode body is not less than the number of positive electrode layers in the positive electrode body.

[0219] In some implementations, the number of positive electrode layers in the positive electrode body is equal to the number of negative electrode layers in the negative electrode body.

[0220] In some implementations, the number of positive electrode layers N in the positive electrode body P ≥1, optionally, N P ≥2, and further optionally, N P ≥5, and further optionally, N P ≥10, and further optionally, N P ≥20, and further optionally, N P ≥30, and further optionally, N P ≥40, and further optionally, N P ≥50. (Unrestricted) The number of cathode layers N in the cathode body. P The range is 1 to 60, with a selectable range of 2 to 60. The number of positive electrode layers N in the positive electrode body. P It can also be any of the following values ​​or an interval composed of any two of the following values: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, etc.

[0221] In some implementations, the number of positive electrode layers in the positive electrode body is 1.

[0222] In some embodiments, multiple positive electrode layers in the positive electrode body are connected to positive electrode tabs; multiple negative electrode layers in the negative electrode body are connected to negative electrode tabs.

[0223] In this application, unless otherwise specified, when multiple positive electrode layers in the positive electrode body are connected to positive electrode tabs, the multiple positive electrode tabs are stacked in the Z direction to form a multi-layer positive electrode tab structure. In this case, the "positive electrode tab" can also be referred to as a positive electrode tab stack.

[0224] In this application, unless otherwise specified, when multiple negative electrode layers in the negative electrode body are connected to negative electrode tabs, the multiple negative electrode tabs are stacked in the Z direction to form a multi-layered negative electrode tab structure. In this case, the "negative electrode tab" can also be referred to as a negative electrode tab stack.

[0225] When multiple positive electrode layers in the positive electrode body are connected to positive electrode tabs and multiple negative electrode layers in the negative electrode body are connected to negative electrode tabs, it is more conducive to saving the waste of internal space caused by the stacking of multiple electrode tabs.

[0226] In a solid-state battery cell, the positive electrode layer is provided with a recess corresponding to the second composite groove, which can be referred to as the first recess; the negative electrode layer is provided with a recess corresponding to the first composite groove, which can be referred to as the second recess; the solid electrolyte layer is provided with recesses corresponding to the first composite groove and the second composite groove respectively. The recess corresponding to the first composite groove can be referred to as the fourth recess, and the recess corresponding to the second composite groove can be referred to as the third recess.

[0227] In a solid-state battery cell, the positive tab recess, the fourth empty recess, and the second empty recess are matched to provide a first composite recess that accommodates at least a portion of the positive tab, and the negative tab recess, the third empty recess, and the first empty recess are matched to provide a second composite recess that accommodates at least a portion of the negative tab.

[0228] In some embodiments, this application provides a solid-state battery cell, which includes a positive electrode portion, a solid electrolyte portion and a negative electrode portion stacked together, wherein the positive electrode portion and the negative electrode portion are isolated by the solid electrolyte portion; the positive electrode portion includes a positive electrode body and a positive electrode tab connected to the positive electrode body, and the negative electrode portion includes a negative electrode body and a negative electrode tab connected to the negative electrode body;

[0229] The positive electrode body includes at least one positive electrode layer, and the at least one positive electrode layer is connected to a positive electrode tab. All the positive electrode tabs connected to the positive electrode body together constitute at least a part of the positive electrode tab portion. The negative electrode body includes at least one negative electrode layer, and the at least one negative electrode layer is connected to a negative electrode tab. All the negative electrode tabs connected to the negative electrode body together constitute at least a part of the negative electrode tab portion.

[0230] At at least one edge extending along the X direction, the solid-state battery cell is provided with two composite grooves, referred to as the first composite groove and the second composite groove, respectively; the first composite groove is used to accommodate at least a portion of the positive electrode tab, and the second composite groove is used to accommodate at least a portion of the negative electrode tab.

[0231] In some embodiments, this application provides a solid-state battery cell, which includes a positive electrode portion, a solid electrolyte portion and a negative electrode portion stacked together, wherein the positive electrode portion and the negative electrode portion are isolated by the solid electrolyte portion; the positive electrode portion includes a positive electrode body and a positive electrode tab connected to the positive electrode body, and the negative electrode portion includes a negative electrode body and a negative electrode tab connected to the negative electrode body;

[0232] The positive electrode body includes multiple positive electrode layers, each of which is connected to a positive electrode tab. All the positive electrode tabs connected to the positive electrode body together constitute a positive electrode tab stack. The negative electrode body includes multiple negative electrode layers, each of which is connected to a negative electrode tab. All the negative electrode tabs connected to the negative electrode body together constitute a stack.

[0233] At at least one edge extending along the X direction, the solid-state battery cell is provided with two composite grooves, referred to as the first composite groove and the second composite groove, respectively; the first composite groove is used to accommodate at least a portion of the positive electrode tab, and the second composite groove is used to accommodate at least a portion of the negative electrode tab.

[0234] In this application, the "tab laminate" includes a positive tab laminate and a negative tab laminate. It is understood that each tab in the tab laminate is connected to a corresponding electrode layer, and further, each tab is connected to a current collector layer within the corresponding electrode layer. The multiple positive tabs in the positive tab laminate are each connected to a corresponding positive electrode layer, and further, each tab is connected to a positive current collector layer within the corresponding positive electrode layer. The multiple negative tabs in the negative tab laminate are each connected to a corresponding negative electrode layer, and further, each tab is connected to a negative current collector layer within the corresponding negative electrode layer.

[0235] In a second aspect of this application, a solid-state battery cell is provided, which includes the solid-state cell described in the first aspect of this application.

[0236] In a third aspect of this application, a solid-state battery is provided, which includes the solid-state cell described in the first aspect of this application.

[0237] In some implementations, the solid-state battery is an all-solid-state battery.

[0238] Solid-state battery cells, including the aforementioned solid-state battery cells, increase the volume of the electrode body at the tab height, thereby increasing the space occupancy of the electrode active material layer and significantly improving the volumetric energy density.

[0239] Non-limitingly, a solid-state battery cell can be prepared by sequentially stacking a pre-fabricated positive electrode, a pre-fabricated solid electrolyte membrane, and a pre-fabricated negative electrode, placing the solid electrolyte membrane between the positive and negative electrode, and then hot rolling.

[0240] In some embodiments, the solid-state battery cell can be prepared using a method including steps S100, S200, S300, and S400:

[0241] S100: Prepare a positive electrode sheet with a positive electrode tab groove and a first empty groove. The positive electrode sheet includes a positive electrode current collector layer, a positive electrode active material layer located on at least one side of the positive electrode current collector, and a positive electrode tab connected to the positive electrode current collector layer. The positive electrode tab is disposed at the positive electrode tab groove.

[0242] S200: Prepare a negative electrode sheet with a negative electrode tab groove and a second empty groove. The negative electrode sheet includes a negative electrode current collector layer, a negative electrode active material layer located on at least one side of the negative electrode current collector, and a negative electrode tab connected to the negative electrode current collector layer. The negative electrode tab is disposed at the negative electrode tab groove.

[0243] S300: Prepare a solid electrolyte membrane with a third and a fourth cavitation groove;

[0244] S400: A laminate is fabricated by sequentially stacking a positive electrode sheet, a solid electrolyte membrane, and a negative electrode sheet in the order of "negative electrode sheet - solid electrolyte membrane - positive electrode sheet - solid electrolyte membrane". The positive electrode tab groove, the fourth empty groove, and the second empty groove are aligned to form a first composite groove, and the negative electrode tab groove, the third empty groove, and the first empty groove are aligned to form a second composite groove. All positive electrode tabs provided by the positive electrode sheet are disposed at the first composite groove and together constitute at least a portion of the positive electrode tab portion. All negative electrode tabs provided by the negative electrode sheet are disposed at the second composite groove and together constitute at least a portion of the negative electrode tab portion. The stacked laminate is then subjected to hot rolling to prepare a solid-state battery cell. Each positive electrode sheet constitutes the positive electrode portion, each negative electrode sheet constitutes the negative electrode portion, and each solid electrolyte membrane constitutes the solid electrolyte portion.

[0245] Based on the number of positive electrode plates, the number of positive electrode plates stacked can be one or more. Generally, the number of negative electrode plates stacked is not less than the number of positive electrode plates stacked.

[0246] In some implementations, the number of layers of the positive electrode is equal to the number of layers of the negative electrode.

[0247] In some embodiments, there are multiple positive electrode sheets stacked together; the outlines of multiple positive electrode tabs of multiple positive electrode sheets are aligned and together form a positive electrode tab stack, at least a portion of the positive electrode tab stack is accommodated in a first composite groove; the outlines of multiple negative electrode tabs of multiple negative electrode sheets are aligned and together form a negative electrode tab stack, at least a portion of the negative electrode tab stack is accommodated in a second composite groove.

[0248] In this application, unless otherwise specified, the "empty groove" in the positive electrode sheet, negative electrode sheet, and solid electrolyte membrane refers to the space reserved in the corresponding groove before assembly into a solid-state battery cell. After assembly into a battery cell, it can participate in the formation of a composite groove to provide space for the matching tab. For example, in some embodiments, the positive electrode sheet used to form the positive electrode layer, in addition to having a positive electrode tab groove that matches the position of the positive electrode tab, also has a first empty groove reserved for matching the position of the negative electrode tab in the solid-state battery cell; the negative electrode sheet used to form the negative electrode layer, in addition to having a negative electrode tab groove that matches the position of the negative electrode tab, also has a second empty groove reserved for matching the position of the positive electrode tab in the solid-state battery cell; the solid electrolyte membrane used to form the solid electrolyte layer has a third empty groove reserved for matching the position of the negative electrode tab in the solid-state battery cell and a fourth empty groove reserved for matching the position of the positive electrode tab in the solid-state battery cell.

[0249] In the application, the terms "first recess," "second recess," "third recess," and "fourth recess" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or quantity, nor should they be construed as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first," "second," "third," and "fourth" serve only as a non-exhaustive enumeration and should be understood not to constitute a closed limitation on quantity.

[0250] In some embodiments, the solid-state battery cell can be prepared using a method including steps S100, S200, S300, and S400:

[0251] S100: Prepare a positive electrode sheet with a positive electrode tab groove and a first empty groove. The positive electrode sheet includes a positive electrode current collector layer, a positive electrode active material layer located on at least one side of the positive electrode current collector, and a positive electrode tab connected to the positive electrode current collector layer. The positive electrode tab is disposed at the positive electrode tab groove.

[0252] S200: Prepare a negative electrode sheet with a negative electrode tab groove and a second empty groove. The negative electrode sheet includes a negative electrode current collector layer, a negative electrode active material layer located on at least one side of the negative electrode current collector, and a negative electrode tab connected to the negative electrode current collector layer. The negative electrode tab is disposed at the negative electrode tab groove.

[0253] S300: Prepare a solid electrolyte membrane with a third and a fourth cavitation groove;

[0254] S400: Multiple positive electrode sheets, multiple solid electrolyte membrane sheets, and multiple negative electrode sheets are stacked sequentially in the order of "negative electrode sheet - solid electrolyte membrane sheet - positive electrode sheet - solid electrolyte membrane sheet" to form a laminate. The outlines of the positive electrode tab groove, the fourth empty groove, and the second empty groove are aligned to form a first composite groove, and the outlines of the negative electrode tab groove, the third empty groove, and the first empty groove are aligned to form a second composite groove. The outlines of the multiple positive electrode tabs of the multiple positive electrode sheets are aligned and together form a positive electrode tab laminate, at least a portion of which is accommodated in the first composite groove. The outlines of the multiple negative electrode tabs of the multiple negative electrode sheets are aligned and together form a negative electrode tab laminate, at least a portion of which is accommodated in the second composite groove. The stacked laminate is subjected to hot rolling treatment to prepare a solid-state battery cell.

[0255] In some embodiments, the method for preparing a solid-state battery cell further includes one or both of steps S500 and S600:

[0256] S500: Bend at least a portion of the positive electrode tab into the first composite groove to obtain a bent portion of the positive electrode tab in the first composite groove;

[0257] S600: Bend at least a portion of the negative electrode tab into the second composite groove to obtain the bent portion of the negative electrode tab in the second composite groove.

[0258] Those skilled in the art will understand that the order in which the steps are written in the methods of various embodiments or examples does not imply a strict execution order and does not constitute any limitation on the implementation process. The detailed execution order of each step should be determined by its function and possible internal logic. Unless otherwise specified, all steps of this application may be performed sequentially or randomly, but are preferably performed sequentially. For example, if method M includes steps (a) and (b), it means that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, method M may also include step (c), meaning that step (c) can be added to method M in any order. For example, method M may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0259] The positive electrode tab groove and the first empty groove in the positive electrode sheet, the negative electrode tab groove and the second empty groove in the negative electrode sheet, and the third empty groove and the fourth empty groove in the solid electrolyte membrane can all be prepared by laser cutting technology.

[0260] Taking the wet preparation of the positive electrode sheet as an example, a positive electrode sheet with a positive tab groove and a first empty groove can be prepared by a method including the following steps:

[0261] S12: The positive electrode slurry is coated on a predetermined area on at least one side surface of the positive electrode current collector membrane material, and a concave blank area is left at a predetermined position in the positive electrode tab groove and the first empty groove. After drying, a positive electrode active material layer with a concave blank area is formed, and a positive electrode multilayer including a positive electrode current collector and a positive electrode active material layer with a concave blank area is obtained.

[0262] S14: The positive electrode current collector film is die-cut using laser cutting technology to obtain a positive electrode current collector layer that matches the shape of the positive electrode active material layer. A positive electrode tab is formed at a predetermined position of the positive electrode tab groove to maintain connection with the positive electrode current collector layer, and a first empty groove is formed at a predetermined position of the first empty groove. Further, the positive electrode tab groove corresponds to a first composite groove in the solid-state battery cell that provides space for the positive electrode tab, and the first empty groove corresponds to a second composite groove in the solid-state battery cell that accommodates at least a portion of the negative electrode tab.

[0263] It can be understood that in step S12, the positive electrode slurry is composed of the raw materials and solvents that make up the positive electrode active material layer. After drying, the solvent is removed, and the remaining components form the corresponding positive electrode active material layer.

[0264] In step S12, the concave blank area is not coated with positive electrode paste. After drying, the formed positive electrode active area has a concave blank area. The concave contour of the concave blank area can guide the die-cutting trajectory in the subsequent die-cutting step.

[0265] The positive electrode tab formed in step S14 is usually classified as a "soft electrode tab".

[0266] In step S14, during die-cutting, the positive electrode current collector film at the positive electrode tab retains a portion matching the width of the positive electrode tab groove, ensuring the positive electrode tab remains connected to the positive electrode current collector layer; that is, the positive electrode tab and the positive electrode current collector are integrated at this point. In the width direction, the two sides of the positive electrode tab are separated from the edge of the positive electrode current collector layer, allowing the positive electrode tab to be bent in a direction perpendicular to the surface of the positive electrode current collector film. Furthermore, a gap is provided between the two sides of the positive electrode tab and the edge of the positive electrode current collector layer.

[0267] In step S14, during die-cutting, the positive current collector film at the first recess is cut away. During subsequent assembly of the solid-state battery cell, this first recess corresponds to the position of the negative tab recess, allowing the negative tab to be bent in a direction perpendicular to the surface of the negative electrode sheet. Furthermore, in solid-state batteries with more than one negative electrode layer and more than one negative tab, there is no positive current collector film residue between the multiple negative tabs in the negative tab portion.

[0268] Taking the wet preparation of the negative electrode sheet as an example, a negative electrode sheet with a negative electrode lug groove and a second empty groove can be prepared by a method including the following steps:

[0269] S22: The negative electrode slurry is coated on a predetermined area on at least one side surface of the negative electrode current collector membrane material, and a concave blank area is formed at a predetermined position of the negative electrode ear groove and the second empty groove. After drying, a negative electrode active material layer with a concave blank area is formed, and a negative electrode multilayer including a negative electrode current collector and a negative electrode active material layer with a concave blank area is obtained.

[0270] S24: The negative electrode current collector film is die-cut using laser cutting technology to obtain a negative electrode current collector layer that matches the shape of the negative electrode active material layer. A negative electrode tab is formed at a predetermined position of the negative electrode tab groove to maintain connection with the negative electrode current collector layer, and a second empty groove is formed at a predetermined position of the second empty groove. Further, the negative electrode tab groove corresponds to a second composite groove in the solid-state battery cell for accommodating at least a portion of the negative electrode tab, and the second empty groove corresponds to a first composite groove in the solid-state battery cell for accommodating at least a portion of the positive electrode tab.

[0271] It can be understood that in step S22, the negative electrode slurry is composed of the raw materials and solvents that make up the negative electrode active material layer. After drying, the solvent is removed, and the remaining components form the corresponding negative electrode active material layer.

[0272] In step S22, the concave blank area is not coated with negative electrode slurry. After drying, the formed negative electrode active area has a concave blank area. The concave contour of the concave blank area can guide the die-cutting trajectory in the subsequent die-cutting step.

[0273] The negative electrode tab formed in step S24 is usually classified as a "soft electrode tab".

[0274] In step S24, during die-cutting, the negative electrode current collector film at the negative electrode tab retains a portion matching the width of the negative electrode tab groove, ensuring the negative electrode tab remains connected to the negative electrode current collector layer. In the width direction, the two sides of the negative electrode tab are separated from the edge of the negative electrode current collector layer, allowing the negative electrode tab to be bent in a direction perpendicular to the surface of the negative electrode current collector film. Furthermore, a gap is provided between the two sides of the negative electrode tab and the edge of the negative electrode current collector layer.

[0275] In step S24, during die-cutting, the negative current collector film at the second recess is cut away. During subsequent assembly of the solid-state cell, this second recess corresponds to the position of the positive tab recess, allowing the positive tab to be bent in a direction perpendicular to the surface of the positive electrode. Furthermore, in solid-state cells where the number of positive electrode layers in the positive electrode body is greater than one and the number of positive tabs is greater than one, there is no residual negative current collector film between the multiple positive tabs in the positive tab portion.

[0276] Taking the preparation of a solid electrolyte membrane as an example, a solid electrolyte membrane with a third and a fourth cavity can be prepared by a method including the following steps:

[0277] S34: The solid electrolyte membrane material is die-cut using laser cutting technology to obtain a solid electrolyte membrane sheet that matches the shape of the positive and negative electrode sheets. A fourth recess is formed at a predetermined position of the positive electrode tab in the positive electrode sheet, and a third recess is formed at a predetermined position of the negative electrode tab in the negative electrode sheet. Further, the fourth recess corresponds to a first composite recess in the solid-state battery cell for accommodating at least a portion of the positive electrode tab, and the third recess corresponds to a second composite recess in the solid-state battery cell for accommodating at least a portion of the negative electrode tab.

[0278] In a non-limiting manner, solid electrolyte membrane materials can be prepared by any suitable known method, such as pressing the constituent raw materials of solid electrolyte membrane materials (such as solid electrolyte powder) into a membrane shape under pressure to obtain solid electrolyte membrane materials.

[0279] A solid-state battery includes at least one solid-state battery cell. A solid-state battery may include one or more solid-state battery cells.

[0280] In this application, unless otherwise specified, "solid-state battery cell" refers to a basic unit capable of converting chemical energy into electrical energy, and all its components are solid-state. In some embodiments, a solid-state battery cell may be an all-solid-state battery cell.

[0281] In this application, unless otherwise specified, "all-solid-state battery cell" refers to a solid-state battery cell in which all electrolytes are solid electrolytes. In this case, the positive electrode layer, negative electrode layer and electrolyte part are all made of solid materials, and no liquid electrolyte is provided in the battery cell, so it can be called "all-solid-state battery cell".

[0282] Non-limitingly, a solid-state battery cell (which can be an all-solid-state battery cell) may include a positive electrode layer, a solid electrolyte layer, and a negative electrode layer, with the solid electrolyte layer located between the positive and negative electrode layers. During battery charging and discharging, active ions shuttle between the positive and negative electrode layers, inserting and extracting. The solid electrolyte layer serves to conduct ions between the positive and negative electrode layers and also isolates them, thus preventing short circuits between the positive and negative electrodes.

[0283] In some embodiments, the solid-state battery cell 5 includes a solid-state cell 52.

[0284] In some implementations, the solid-state cell is an all-solid-state cell.

[0285] In some embodiments, the solid-state cell 52 (which may be an all-solid-state cell) includes a positive electrode layer, a solid electrolyte layer, and a negative electrode layer stacked sequentially.

[0286] In some embodiments, the solid-state battery may include an outer packaging. This outer packaging can be used to encapsulate the aforementioned solid-state battery cell.

[0287] In some embodiments, the outer packaging of a solid-state battery can be a rigid shell, such as a hard plastic shell, an aluminum shell, or a steel shell. The outer packaging of a solid-state battery can also be a soft pack, such as a pouch-type soft pack. The material of the soft pack can be plastic; further, non-limiting examples of plastics may include one or more of polypropylene, polybutylene terephthalate, and polybutylene succinate.

[0288] This application does not impose any particular limitation on the shape of the solid-state battery cell; it can be cylindrical, square, or any other arbitrary shape. For example, Figure 3 shows a square solid-state battery cell 5 as an example.

[0289] In some embodiments, referring to FIG4, the outer packaging may include a housing 51 and a cover plate 53. The housing 51 may include a base plate and side plates connected to the base plate, the base plate and side plates forming a receiving cavity. The housing 51 has an opening communicating with the receiving cavity, and the cover plate 53 can be placed over the opening to close the receiving cavity. A solid-state battery cell 52 is encapsulated within the receiving cavity. The number of solid-state battery cells 52 contained in the solid-state battery cell 5 may be one or more, which can be selected by those skilled in the art according to actual needs.

[0290] The solid-state battery can be either battery module 4 or battery pack 1.

[0291] The battery module includes at least one solid-state battery cell. The number of solid-state battery cells in the battery module can be one or more, and those skilled in the art can select an appropriate number based on the application and capacity of the battery module.

[0292] Figure 5 shows a battery module 4 as an example. Referring to Figure 5, in the battery module 4, multiple solid-state battery cells 5 can be arranged sequentially along the length of the battery module 4. Of course, they can also be arranged in any other arbitrary way. Furthermore, the multiple solid-state battery cells 5 can be fixed in place by fasteners.

[0293] Optionally, the battery module 4 may also include a housing with a receiving space in which multiple solid-state battery cells 5 are housed.

[0294] In some embodiments, the battery modules described above can also be assembled into a battery pack, and the battery pack may contain one or more battery modules. Those skilled in the art can select an appropriate number based on the application and capacity of the battery pack.

[0295] Figures 6 and 7 illustrate a battery pack 1 as an example. Referring to Figures 6 and 7, the battery pack 1 may include a battery box and multiple battery modules 4 disposed within the battery box. The battery box includes an upper body 2 and a lower body 3, with the upper body 2 covering the lower body 3 to form a closed space for accommodating the battery modules 4. The multiple battery modules 4 can be arranged in any manner within the battery box.

[0296] In a fourth aspect of this application, an electrical device is provided, comprising at least one of the solid-state battery cell described in the first aspect of this application, the solid-state battery cell described in the second aspect of this application, and the solid-state battery described in the third aspect of this application.

[0297] In some embodiments, the electrical device includes at least one of the solid-state batteries of any of the embodiments provided in this application.

[0298] In a non-limiting sense, solid-state batteries can be used as a power source for electrical devices or as an energy storage unit for electrical devices. Electrical devices can include, but are not limited to, mobile devices, electric vehicles, electric trains, ships and satellites, energy storage systems, etc. Mobile devices can be, for example, mobile phones, laptops, etc.; electric vehicles can be, for example, pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, electric motorcycles, power tools, etc., but are not limited to these. This electrical device can also be applied to military equipment, aerospace, and other fields, and can also be applied to energy storage power systems such as hydroelectric, thermal, wind, and solar power plants.

[0299] As an electrical device, solid-state batteries can be selected based on its usage requirements.

[0300] Figure 8 shows an example of an electrical device 6. This electrical device is a pure electric vehicle, a hybrid electric vehicle, or a plug-in hybrid electric vehicle, etc. To meet the high power and high energy density requirements of solid-state batteries for this electrical device, a battery pack or battery module can be used.

[0301] Another example device could be a mobile phone, tablet, or laptop. These devices typically require a thin and light design and can use solid-state batteries as their power source.

[0302] The following describes some embodiments of this application. The embodiments described below are exemplary and are only used to explain this application, and should not be construed as limiting this application. Where the technology or conditions are not specified in the embodiments, they are performed according to the description above, or according to the technology or conditions described in the literature in this field, or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be obtained commercially, or can be synthesized from commercially available products using conventional methods.

[0303] In the following examples, the solid electrolyte layer, solid electrolyte membrane, positive current collector membrane, positive active material layer, positive electrode sheet, negative current collector membrane, negative active material layer, and negative electrode sheet: their width direction is consistent with the width direction (X direction) of the solid battery cell, their height direction is consistent with the height direction (Y direction) of the solid battery cell, and their thickness direction is consistent with the thickness direction (Z direction) of the solid battery cell.

[0304] In the following examples, the positive or negative electrode sheet has a tab groove, a corresponding tab, and a reserved empty groove on the same side edge in the electrode height direction. Correspondingly, a positive tab and a negative tab are provided on the same side in the solid-state cell height direction. In other embodiments, when the positive and negative tabs are located on different sides in the solid-state cell height direction, the utilization rate ψ of the active extension region in the Y direction... Y and the two-dimensional utilization rate ψ of the active extension region A It will be higher.

[0305] In the following examples, as non-limiting examples, the positive electrode tab groove, the second empty groove, the fourth empty groove, and the first composite groove have the same shape and size in the X and Y directions; the negative electrode tab groove, the first empty groove, the third empty groove, and the second composite groove have the same shape and size in the X and Y directions; and the dimensions of the positive electrode tab groove and the negative electrode tab groove are also substantially the same in the X and Y directions. For each of the above grooves, the groove depth is equal to the groove height, the groove width direction is consistent with the X direction, the groove height or depth direction is consistent with the Y direction, and the groove thickness direction is consistent with the Z direction.

[0306] In the following examples, during the preparation of the positive and negative electrode sheets, after die-cutting, the width of the positive electrode tab and the width of the negative electrode tab are slightly smaller than the width of the corresponding groove. That is, in the electrode sheet width direction, gaps are provided between the positive and negative electrode tabs and the two sides of the corresponding electrode tab groove, with each gap ranging from 10μm to 5000μm and from 0.1mm to 1mm. Correspondingly, in the solid-state battery cell, gaps are provided between the positive and negative electrode tabs and the two sides of the corresponding composite groove, with each gap ranging from 10μm to 5000μm and from 0.1mm to 1mm.

[0307] In the following examples, as non-limiting examples, the height of both the positive and negative tabs is set to 15 mm.

[0308] In the following examples, solid-state cells with a stacked structure are used as non-limiting examples.

[0309] Example 1.

[0310] Refer to Figure 2 for a schematic diagram of the preparation process of the positive and negative electrode sheets.

[0311] (1) Preparation of positive electrode 100.

[0312] S12: The positive electrode slurry is coated on both sides of the positive electrode current collector membrane 111, and concave blank areas are reserved for the positive electrode tab groove 122 and the first empty groove 124 respectively. After drying, a positive electrode active region 120 with a positive electrode concave blank area 121 is formed.

[0313] S14: The positive electrode current collector film 111 is die-cut using laser cutting technology to obtain a positive electrode current collector layer that matches the shape of the positive electrode active region. The positive electrode active region corresponds to the positive electrode active material layer. A positive electrode tab 130 is formed at a preset position of the positive electrode tab groove 122 to maintain connection with the positive electrode current collector layer. A first empty groove 124 is formed at a preset position of the first empty groove. Further, the positive electrode tab groove 122 corresponds to a first composite groove 1302 in the solid-state battery cell 52 for accommodating a portion of the positive electrode tab 1300, and the first empty groove 124 corresponds to a second composite groove 3302 in the solid-state battery cell 52 for accommodating a portion of the negative electrode tab 3300.

[0314] (2) Preparation of negative electrode 300.

[0315] S22: The negative electrode slurry is coated on both sides of the negative electrode current collector membrane 311, and concave blank areas are reserved for the negative electrode ear groove 322 and the second empty groove 324 respectively. After drying, a negative electrode active area 320 with a negative electrode concave blank area 321 is formed.

[0316] S24: The negative electrode current collector film 311 is die-cut using laser cutting technology to obtain a negative electrode current collector layer that matches the shape of the negative electrode active region. The negative electrode active region corresponds to the negative electrode active material layer. A negative electrode tab 320 is formed at a preset position of the negative electrode tab groove 322 to maintain connection with the negative electrode current collector layer. A second empty groove 324 is formed at a preset position of the second empty groove. Further, the negative electrode tab groove 322 corresponds to the second composite groove 3302 in the solid-state battery cell 52 for accommodating a portion of the negative electrode tab 3300, and the second empty groove 324 corresponds to the first composite groove 1302 in the solid-state battery cell 52 for accommodating a portion of the positive electrode tab 1300.

[0317] (3) Preparation of solid electrolyte membrane.

[0318] S34: The solid electrolyte membrane is die-cut using laser cutting technology to obtain a solid electrolyte membrane sheet that matches the shape of the positive and negative electrode sheets. A fourth recess is reserved for the positive electrode tab in the positive electrode sheet, and a third recess is reserved for the negative electrode tab in the negative electrode sheet. Further, the fourth recess corresponds to the first composite recess 1302 in the solid-state cell 52 for accommodating a portion of the positive electrode tab 1300, and the third recess corresponds to the second composite recess 3302 in the solid-state cell 52 for accommodating a portion of the negative electrode tab 3300.

[0319] (4) Assemble to obtain solid-state battery cells, the structure of which can be seen in Figure 1.

[0320] The aforementioned positive electrode 100, solid electrolyte membrane, and negative electrode 300 are stacked sequentially in the order of "negative electrode - solid electrolyte membrane - positive electrode - solid electrolyte membrane" to form a laminated component. The positive electrode tab groove 122, the fourth empty groove, and the second empty groove are aligned to form a first composite groove 1302, and the negative electrode tab groove 322, the third empty groove, and the first empty groove are aligned to form a second composite groove 3302. The positive electrode tab 130 of the positive electrode 100 is aligned and together constitutes the positive electrode tab portion 1300. A portion of the tab 1300 is accommodated in the first composite groove 1302. The negative tabs 330 of the negative electrode 300 are aligned and together form the negative tab 3300. A portion of the negative tab 3300 is accommodated in the second composite groove 3302. The stacked components are subjected to hot rolling to prepare a solid-state battery cell 52. The region corresponding to the positive active region in the positive electrode 100 provides a positive electrode layer 10, the region corresponding to the negative active region in the negative electrode 300 provides a negative electrode layer 30, and the solid electrolyte membrane provides a solid electrolyte layer 20. All the positive electrode layers in the solid-state battery cell together constitute the positive electrode body, and all the negative electrode layers in the solid-state battery cell together constitute the negative electrode body.

[0321] In this example, there are 5 positive electrode plates in the laminate; multiple positive electrode layers in the solid-state cell together constitute the positive electrode body, and multiple negative electrode layers in the solid-state cell together constitute the negative electrode body.

[0322] In this example, the positive electrode portion includes multiple positive electrodes, corresponding to the positive electrode stack; the negative electrode portion includes multiple negative electrodes, corresponding to the negative electrode stack.

[0323] Multiple positive electrodes on the positive electrode tab are welded together to form a flexible positive electrode tab, which is then connected to a rigid aluminum electrode tab. Multiple negative electrodes on the negative electrode tab are welded together to form a flexible negative electrode tab, which is then connected to a rigid nickel electrode tab. The flexible positive electrode tab is pre-bent so that at least a portion extending beyond the first composite groove is placed within the first composite groove. The flexible negative electrode tab is also pre-bent so that at least a portion extending beyond the second composite groove is placed within the second composite groove.

[0324] (5) Aluminum-plastic film encapsulation: The aluminum-plastic film is punched indented and placed overlapping with the solid-state battery cell. The edges of the aluminum-plastic film are then sealed to encapsulate the solid-state battery cell within the housing cavity, thus obtaining a solid-state battery. The height of the solid-state battery cell is basically the same as the height of the housing cavity.

[0325] Examples 2-16 involve changing the cell size and / or groove size. See Table 1 for details.

[0326] In Example 2, the method is basically the same as in Example 1, except that the cell width is changed, as shown in Table 1.

[0327] In Example 3, the method is basically the same as that in Example 1, except that the cell width and cell height are changed, as shown in Table 1.

[0328] In Example 4, the method is basically the same as in Example 1, except that the cell width and groove height are changed, as shown in Table 1.

[0329] In Example 5, the method is basically the same as in Example 1, except that the cell width and groove height are changed, as shown in Table 1.

[0330] In Examples 6-7, the method is basically the same as that in Example 1, except that the height of the groove is changed, as shown in Table 1.

[0331] In Examples 8-9 and 15-16, the method is basically the same as that in Example 1, except that the cell width and groove height are changed, as shown in Table 1.

[0332] In Examples 10-13, the method is basically the same as that in Example 1, except that the cell width, groove width, and groove height are changed, as shown in Table 1.

[0333] In Example 14, the method is basically the same as in Example 1, except that the cell width, cell height and groove height are changed, as shown in Table 1.

[0334] Example 17. The method is basically the same as that in Example 1, except that in step (4), the number of positive electrode plates in the laminate is 1, the positive electrode part includes only one positive electrode layer and one positive electrode tab, and the positive electrode tab is used as the positive electrode tab part to directly connect to the aluminum hard electrode tab; the number of negative electrode plates in the laminate is 1, the negative electrode part includes only one negative electrode layer and one negative electrode tab, and the negative electrode tab is used as the negative electrode tab part to directly connect to the nickel hard electrode tab.

[0335] Comparative Examples 1-17. Traditional process, no active extension region.

[0336] Comparative Examples 1-17 are based on Examples 1-17 without an active extension region. In step S12 of preparing the positive electrode sheet, when coating the positive electrode slurry, the height region corresponding to the positive electrode tab groove is not coated with the positive electrode slurry, that is, the region corresponding to the active extension region of Examples 1-17 is not coated with the positive electrode slurry. In step S14, during die-cutting, the height of the positive electrode tab remains unchanged, and the region of the positive electrode current collector film not coated with the positive electrode slurry is cut off. In step S22 of preparing the negative electrode sheet, when coating the negative electrode slurry, the height region corresponding to the negative electrode tab groove is not coated with the negative electrode slurry, that is, the region corresponding to the active extension region of Examples 1-17 is not coated with the negative electrode slurry.

[0337] In Examples 1-17, the active extension region is not coated with negative electrode slurry. During die cutting in step S24, the height of the negative electrode tab remains unchanged, and the area of ​​the negative electrode current collector membrane material that is not coated with negative electrode slurry is cut off.

[0338] Analysis method:

[0339] I. The volume utilization improvement contributed by the active extended region to solid-state batteries.

[0340] Volume utilization improvement rate: can be estimated based on the percentage of the area of ​​the active extension region relative to the area of ​​the active region of the electrode when no active extension region is provided.

[0341] Based on the parameters in Table 1, the following formula can be used to calculate:

[0342] Volume utilization improvement rate = (W Δ ×H Δ ) / (W0×(H 0- H Δ ))×100%.

[0343] The analysis results can be found in Table 1.

[0344] II. Utilization parameters of the active extension region

[0345] 1. The utilization rate of the active extension region in the Y direction (height direction of the solid-state cell) can be estimated using the following formula: ψ Y =H Δ / H0×100%.

[0346] 2. The utilization rate of the active extension region in the X direction (width direction of the solid-state cell) can be estimated using the following formula: ψ X =W Δ / W0×100%.

[0347] 3. The two-dimensional utilization rate of the active extension region can be estimated using the following formula: ψ A =A Δ / A0×100%, where A0 is the projected area of ​​the solid-state cell along the Z direction (the thickness direction of the solid-state cell), and A is the projected area of ​​the active extension region along the Z direction.Δ A0 = W0 × H0, A Δ =H Δ ×(W0-W Δ ).

[0348] Analysis results:

[0349] Compared to Comparative Examples 1-17 without an active extension region, the structural designs of Examples 1-17 can significantly improve the volume utilization rate of solid-state batteries, thereby increasing the volumetric energy density of the batteries.

[0350] In Examples 1-16, taking the number of positive electrode layers = the number of positive electrode layers in the positive electrode body = 5 as an example, it can be understood that those skilled in the art can replace it with other required positive electrode layers according to the battery thickness, and all can achieve the same or basically the same effect of increasing the volumetric energy density of the battery, as in Example 17.

[0351] Table 1.

[0352] The descriptions of the various implementation methods and embodiments above tend to emphasize the differences between them. Similarities or resemblances can be referenced interchangeably, and for the sake of brevity, they will not be repeated here. The technical features of the implementation methods and embodiments described above can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described. However, as long as the combinations of these technical features do not contradict each other, they should be considered within the scope of this specification.

[0353] It should be noted that this application is not limited to the above-described embodiments and examples. The above-described embodiments and examples are merely examples, and any embodiments and examples that have the same structure and achieve the same effect as the technical concept within the scope of this application are included in the technical scope of this application. The embodiments and examples described above only illustrate several embodiments and examples of this application, and although the descriptions are relatively detailed, they should not be construed as limiting the scope of the patent. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments or examples, and other ways of constructing embodiments or examples by combining some of the constituent elements of the embodiments or examples, are also included in the scope of this application without departing from the spirit of this application.

Claims

1. A solid-state battery cell, comprising a positive electrode portion, a solid electrolyte portion, and a negative electrode portion stacked together, wherein the positive electrode portion and the negative electrode portion are isolated by the solid electrolyte portion; the positive electrode portion includes a positive electrode body and a positive electrode tab connected to the positive electrode body, and the negative electrode portion includes a negative electrode body and a negative electrode tab connected to the negative electrode body; The height direction of the solid-state battery cell is denoted as the Y direction, the width direction as the X direction, and the thickness direction as the Z direction; the X direction, the Y direction, and the Z direction are perpendicular to each other; At at least one edge extending along the X direction, the solid-state battery cell is provided with two composite grooves, referred to as the first composite groove and the second composite groove, respectively; the first composite groove is used to accommodate at least a portion of the positive electrode tab, and the second composite groove is used to accommodate at least a portion of the negative electrode tab.

2. The solid-state battery cell according to claim 1, wherein, In the solid-state battery cell, the active region that is at the same height as the first composite groove and the second composite groove in the Y direction and is located outside the first composite groove and the second composite groove in the X direction is called the active extension region; The height of the positive electrode body at the active extension region is higher than the height of the positive electrode body at the first composite groove, and the height of the negative electrode body at the active extension region is higher than the height of the negative electrode body at the second composite groove. The height of the positive electrode body in the Y direction is denoted as H. P The height of the negative electrode body in the Y direction is denoted as H. N The height of the solid-state battery cell in the Y direction is denoted as H0; the maximum height of the active extension region in the Y direction is denoted as H. Δ Satisfying H Δ >0;H P >(H0-H Δ And H N >(H0-H Δ ).

3. The solid-state battery cell according to claim 2, wherein, H N It is equal to H0.

4. The solid-state battery cell according to claim 2, wherein, The utilization rate ψ of the active extension region in the Y direction Y =H Δ / H0×100%; The solid-state battery cell satisfies one or more of the following characteristics: H Δ ≥0.05mm; ψ Y ≥0.05%.

5. The solid-state battery cell according to claim 4, wherein, The solid-state battery cell satisfies one or more of the following characteristics: 0.05mm≤H Δ ≤1mm; 0.1%≤ψ Y ≤2%.

6. The solid-state battery cell according to any one of claims 1 to 5, wherein, In the solid-state battery cell, the active region that is at the same height as the first composite groove and the second composite groove in the Y direction and is located outside the first composite groove and the second composite groove in the X direction is denoted as the active extension region; the width of the solid-state battery cell in the X direction is denoted as W0, and the width of the active extension region in the X direction is denoted as W. Δ The utilization rate ψ of the active extension region in the X direction X =W Δ / W0×100%; The solid-state battery cell satisfies one or more of the following characteristics: IN Δ ≥50mm; ψ X ≥60%.

7. The solid-state battery cell according to claim 6, wherein, The solid-state battery cell satisfies one or more of the following characteristics: 50mm ≤ W Δ ≤1000mm; 60%≤ψ X ≤95%.

8. The solid-state battery cell according to any one of claims 1 to 7, wherein, Let A0 be the projected area of ​​the solid-state battery cell along the Z direction, and let A be the projected area of ​​the active extension region along the Z direction. Δ The two-dimensional utilization rate ψ of the active extended region A =A Δ / A0×100%; The solid-state battery cell satisfies: ψ A ≥0.04%.

9. The solid-state battery cell according to claim 8, wherein, The solid-state battery cell satisfies: 0.04% ≤ ψ A ≤1.5%.

10. The solid-state battery cell according to any one of claims 1 to 9, wherein, The extension height of the positive electrode ear in the extended state in the Y direction is greater than the height of the first composite groove in the Y direction; The extension height of the negative electrode ear in the extended state in the Y direction is greater than the height of the second composite groove in the Y direction.

11. The solid-state battery cell according to claim 10, wherein, The positive electrode ear includes a positive electrode ear bend located in the first composite groove, and the negative electrode ear includes a negative electrode ear bend located in the second composite groove.

12. The solid-state battery cell according to any one of claims 1 to 11, wherein, The width of the positive electrode ear in the X direction is smaller than the width of the first composite groove in the X direction; the width of the negative electrode ear in the X direction is smaller than the width of the second composite groove in the X direction.

13. The solid-state battery cell according to claim 12, wherein, In the X direction, there is a gap between the positive electrode ear and the two side edges of the first composite groove, and there is a gap between the negative electrode ear and the two side edges of the second composite groove.

14. The solid-state battery cell according to any one of claims 1 to 13, wherein, The solid-state battery cell has a stacked structure.

15. The solid-state battery cell according to claim 14, wherein, The positive electrode body includes at least one positive electrode layer, each positive electrode layer having a groove corresponding to the first composite groove and the second composite groove respectively, and a positive electrode tab is provided at the groove corresponding to the first composite groove in the at least one positive electrode layer; The negative electrode body includes at least one negative electrode layer, each negative electrode layer having a groove corresponding to the second composite groove and the first composite groove respectively, and a negative electrode tab is provided at the groove corresponding to the second composite groove in the at least one negative electrode layer; The solid electrolyte section includes at least one solid electrolyte layer, and any adjacent positive electrode layer and negative electrode layer are isolated by the solid electrolyte layer; each solid electrolyte layer has an empty groove corresponding to the first composite groove and the second composite groove respectively.

16. The solid-state battery cell according to claim 15, wherein, The positive electrode body includes at least one positive electrode layer. Each positive electrode layer independently includes a positive electrode current collector layer and a positive electrode active material layer located on at least one side of the positive electrode current collector layer. Each positive electrode layer has a positive electrode tab groove. All the positive electrode tab grooves in the positive electrode body together constitute a part of the first composite groove. The positive electrode current collector layer in the at least one positive electrode layer is connected to a positive electrode tab at the corresponding positive electrode tab groove. All the positive electrode tabs connected to the positive electrode body together constitute at least a part of the positive electrode tab portion. The negative electrode body includes at least one negative electrode layer. Each negative electrode layer independently includes a negative electrode current collector layer and a negative electrode active material layer located on at least one side of the negative electrode current collector layer. Each negative electrode layer has a negative electrode tab groove. All negative electrode tab grooves in the negative electrode body together constitute a part of the first composite groove. The negative electrode current collector layer in the at least one negative electrode layer is connected to a negative electrode tab at the corresponding negative electrode tab groove. All negative electrode tabs connected to the negative electrode body together constitute at least a part of the negative electrode tab portion.

17. The solid-state battery cell according to claim 16, wherein, The positive electrode body has multiple positive electrode layers; the negative electrode body has the same number of negative electrode layers as the positive electrode body.

18. The solid-state battery cell according to claim 17, wherein, The positive electrode body has multiple positive electrode layers connected to the positive electrode tabs; the negative electrode body has multiple negative electrode layers connected to the negative electrode tabs.

19. A solid-state battery cell comprising any one of claims 1 to 18.

20. A solid-state battery comprising any one of claims 1 to 18.

21. The solid-state battery according to claim 20, wherein, The solid-state battery is an all-solid-state battery.

22. An electrical device comprising at least one of the solid-state battery cell according to any one of claims 1 to 18, the solid-state battery cell according to claim 19, and the solid-state battery according to claim 20 or 21.

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