Battery cell pole group for solid-state battery and solid-state battery

Abstract

The utility model belongs to battery technical field discloses a kind of for solid-state battery's battery core pole group and solid-state battery.The battery core pole group for the solid-state battery includes positive plate, solid-state electrolyte layer and negative plate, and positive plate, solid-state electrolyte layer and negative plate are sequentially arranged to set up.And, the battery core pole group for the solid-state battery further includes at least one pore structure, pore structure is penetrated in positive plate, solid-state electrolyte layer and negative plate, pore structure is at least partially filled with elastic solid-state electrolyte, to make elastic solid-state electrolyte with positive plate, solid-state electrolyte layer and negative plate connection, can enhance the interface contact area of solid-state battery, release the stress caused by volume expansion of electrode material, improve the cycle performance of solid-state battery, and provide ion transmission fast channel, further improve the rate charge-discharge performance.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cell electrode assembly for solid-state batteries and a solid-state battery. Background Technology

[0002] In the new energy industry, the emergence of all-solid-state batteries has brought new hope for solving energy problems. All-solid-state batteries eliminate the electrolyte found in traditional liquid batteries, using a polymer / oxide / sulfide system as the solid electrolyte and separating the positive and negative electrodes with a thin film, successfully replacing the separator.

[0003] However, the solid-solid interface problem is one of the main obstacles to the application of solid-state batteries. In most cases, the solid-solid interface is a point contact with a small contact area. In some battery systems, the interface may initially be a surface contact, but with battery cycling, the electrode materials inevitably undergo volume expansion, causing the originally good surface contact to deteriorate into a point contact, thereby increasing interfacial impedance and continuously deteriorating battery performance. Simultaneously, continuous stress accumulation can also lead to micron-level cracks in the positive electrode and solid electrolyte layer, worsening the contact between the positive electrode and the solid electrolyte layer and accelerating battery performance degradation. Furthermore, the solid-solid interface problem also affects the rate characteristics of solid-state batteries, making high-rate charge and discharge difficult.

[0004] Currently, to ensure a good solid-solid contact interface between the solid electrolyte and the electrode, and to reduce contact losses during battery cycling, a common solution is to apply a high voltage of 60MPa-100MPa to the battery. However, applying such a high voltage to the battery is not only less feasible in electric vehicle applications, but also reduces battery energy density and increases costs.

[0005] Therefore, there is an urgent need for a cell electrode assembly and a solid-state battery for solid-state batteries to solve the above-mentioned technical problems. Utility Model Content

[0006] One objective of this invention is to provide a cell electrode assembly for solid-state batteries that can enhance the interfacial contact area of ​​the solid-state battery, release the stress caused by the volume expansion of the electrode material, improve the cycle performance of the solid-state battery, and provide a fast ion transport channel to further improve the rate charge and discharge performance.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] A cell electrode assembly for a solid-state battery includes a positive electrode, a solid electrolyte layer, and a negative electrode, wherein the positive electrode, the solid electrolyte layer, and the negative electrode are arranged in sequence.

[0009] It also includes at least one channel structure that extends through the positive electrode, the solid electrolyte layer and the negative electrode, and the channel structure is at least partially filled with an elastic solid electrolyte so that the elastic solid electrolyte is connected to the positive electrode, the solid electrolyte layer and the negative electrode.

[0010] Optionally, the aforementioned channel structure includes a first channel, a second channel, and a third channel. The first channel is formed in the positive electrode sheet, the second channel is formed in the solid electrolyte layer, and the third channel is formed in the negative electrode sheet. The elastic solid electrolyte is sequentially connected to the pore walls of the first channel, the second channel, and the third channel to form a continuous filling layer.

[0011] Optionally, the aforementioned elastic solid electrolyte is tightly connected to the pore walls of the aforementioned pore structure.

[0012] Optionally, at least a portion of the gap between the positive electrode and the solid electrolyte layer and / or at least a portion of the gap between the negative electrode and the solid electrolyte layer is filled with a reinforced solid electrolyte layer, which is connected to the elastic solid electrolyte.

[0013] Optionally, the aforementioned reinforced solid electrolyte layer is connected to both the aforementioned positive electrode and the aforementioned solid electrolyte layer; and / or,

[0014] The aforementioned reinforced solid electrolyte layer is connected to the aforementioned negative electrode sheet and the aforementioned solid electrolyte layer, respectively.

[0015] Optionally, the cross-sectional shape of the aforementioned channel structure is circular, elliptical, regular polygonal, or irregular.

[0016] Optionally, the positive electrode, the solid electrolyte layer, and the negative electrode are assembled by a stacking process or a winding process.

[0017] Optionally, the positive electrode sheet includes a positive current collector and a positive active material layer, wherein the positive active material layer is disposed at least on one side of the positive current collector; and / or,

[0018] The aforementioned negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is disposed on at least one side of the aforementioned negative electrode current collector.

[0019] Optionally, the aforementioned positive electrode active material layer is disposed on the side of the aforementioned positive electrode current collector near the aforementioned solid electrolyte layer; and / or,

[0020] The aforementioned negative electrode active material layer is disposed on the side of the aforementioned negative electrode current collector close to the aforementioned solid electrolyte layer.

[0021] Another objective of this invention is to provide a solid-state battery, including the aforementioned cell electrode assembly for a solid-state battery.

[0022] The beneficial effects of this utility model are:

[0023] This invention provides a cell electrode assembly and a solid-state battery for solid-state batteries. By adding a porous structure filled with an elastic solid electrolyte, and with the porous structure penetrating the positive electrode, solid electrolyte layer, and negative electrode, it not only increases the contact area and contact strength between the positive electrode and the solid electrolyte, as well as between the negative electrode and the solid electrolyte, providing a fast channel for lithium-ion transport, thereby improving rate charge and discharge performance; it also largely solves the solid-solid interface contact problem in solid-state batteries, thus improving the cycle life of the battery; moreover, the porous structure filled with the elastic solid electrolyte also acts as a fixing structure, increasing the connection effect between the positive electrode, solid electrolyte layer, and negative electrode. During the cycling process of this cell electrode assembly for solid-state batteries, the expansion of the electrode materials is limited, and the elastic solid electrolyte has a certain elastic deformation capability, which can release the stress caused by the volume expansion of the electrode materials, avoid the formation of continuous stress accumulation, prevent the deterioration of the contact between the electrode and the electrolyte, slow down the battery performance degradation, and further improve the cycle life of the battery. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the cell electrode assembly for a solid-state battery provided in Embodiment 1 of this utility model;

[0025] Figure 2 This is a schematic diagram of the cell electrode assembly for a solid-state battery provided in Embodiment 2 of this utility model;

[0026] Figure 3 This is a schematic diagram of the structure of the reinforced solid electrolyte layer provided in Embodiment 2 of this utility model;

[0027] Figure 4 This is a schematic diagram of the cell electrode assembly for a solid-state battery provided in Embodiment 3 of this utility model;

[0028] Figure 5 This is a schematic diagram of the structure of the positive electrode sheet provided in a specific embodiment of this utility model;

[0029] Figure 6 This is a schematic diagram of the negative electrode sheet provided in a specific embodiment of this utility model.

[0030] In the picture:

[0031] 1. Positive electrode sheet; 101. Positive current collector; 102. Positive active material layer; 2. Solid electrolyte layer; 3. Negative electrode sheet; 301. Negative current collector; 302. Negative active material layer; 4. Pore structure; 401. First pore; 402. Second pore; 403. Third pore; 5. Elastic solid electrolyte; 6. Reinforced solid electrolyte layer. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0033] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this embodiment, the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0036] This embodiment provides a cell electrode assembly for solid-state batteries. This cell electrode assembly can enhance the interfacial contact area of ​​solid-state batteries, release the stress caused by the volume expansion of electrode materials, improve the cycle performance of solid-state batteries, and provide a fast ion transport channel to further improve the rate charge and discharge performance.

[0037] Please refer to Figures 1 to 4 Specifically, the cell electrode assembly for a solid-state battery includes a positive electrode 1, a solid electrolyte layer 2, and a negative electrode 3, which are arranged sequentially to form the cell electrode assembly for the solid-state battery. Furthermore, the cell electrode assembly for the solid-state battery also includes at least one channel structure 4, which penetrates the positive electrode 1, the solid electrolyte layer 2, and the negative electrode 3. The channel structure 4 is at least partially filled with an elastic solid electrolyte 5, so that the elastic solid electrolyte 5 is connected to the positive electrode 1, the solid electrolyte layer 2, and the negative electrode 3.

[0038] In this embodiment, the cell electrode assembly for a solid-state battery, by adding a pore structure 4 filled with an elastic solid electrolyte 5, and the pore structure 4 penetrating through the positive electrode 1, the solid electrolyte layer 2, and the negative electrode 3, not only increases the contact area and contact strength between the positive electrode 1 and the solid electrolyte, as well as the contact area and contact strength between the negative electrode 3 and the solid electrolyte, providing a fast ion transport channel, thereby improving the rate charge and discharge performance; it also largely solves the solid-solid interface contact problem of solid-state batteries, thereby improving the cycle life of the battery; moreover, the pore structure 4 filled with the elastic solid electrolyte 5 also acts as a fixing structure, increasing the fixed connection effect between the positive electrode 1, the solid electrolyte layer 2, and the negative electrode 3. During the cycling process of this cell electrode assembly for solid-state batteries, the expansion of the electrode material is limited, and the elastic solid electrolyte 5 has a certain elastic deformation capability, which can release the stress caused by the volume expansion of the electrode material, avoid the formation of continuous stress accumulation, avoid the deterioration of the contact between the electrode and the solid electrolyte, slow down the battery performance degradation, and further improve the cycle life of the battery.

[0039] It should be noted that the elastic solid electrolyte 5 is a solid electrolyte that can release the stress caused by the volume expansion when the electrode material expands after the cell electrode assembly is assembled into a solid battery, so as to form a solid electrolyte with a certain elastic deformation ability to avoid continuous stress accumulation.

[0040] Optionally, the elastic solid electrolyte 5 includes a polymer electrolyte that has a certain degree of elasticity.

[0041] Preferably, the elastic solid electrolyte 5 includes a gel polymer electrolyte to achieve its elastic characteristics, and the gel state not only has elasticity but also a certain fixation effect, thus meeting the usage requirements of the elastic solid electrolyte 5.

[0042] Optionally, the aforementioned channel structure 4 and elastic solid electrolyte 5 are evenly distributed in multiple sets to improve the contact area and contact strength at each position in the cell electrode assembly for solid-state batteries.

[0043] Optionally, the positive electrode 1, the solid electrolyte layer 2, and the negative electrode 3 can be assembled and formed by a stacking process or a winding process, both of which can achieve the formation of the cell electrode assembly for solid-state batteries. Of course, in other embodiments, the assembly and forming process between the positive electrode 1, the solid electrolyte layer 2, and the negative electrode 3 can also be other forming processes, which are not specifically limited here.

[0044] The number of positive electrode plates 1 and negative electrode plates 3 can be set to one or more groups as needed. All positive electrode plates 1 and negative electrode plates 3 are stacked alternately in sequence, and the solid electrolyte layer 2 is disposed between adjacent positive electrode plates 1 and negative electrode plates 3; no specific limitation is made here. For example, the positive electrode plates 1 and negative electrode plates 3 can be set to 1 group, 2 groups, 4 groups, 8 groups or 24 groups, etc.

[0045] Optionally, the solid electrolyte layer 2 is not only disposed between the positive electrode 1 and the negative electrode 3, but can also be added to the side of the outermost positive electrode 1 away from the solid electrolyte layer 2 and the side of the outermost negative electrode 3 away from the solid electrolyte layer 2, so that the solid electrolyte layer 2 is disposed on the outside of the outermost positive electrode 1 and on the outside of the outermost negative electrode 3, thereby achieving the external insulation characteristics of the cell electrode assembly for solid-state batteries.

[0046] Please refer to Figure 5 Specifically, the positive electrode 1 includes a positive current collector 101 and a positive active material layer 102, wherein the positive active material layer 102 is disposed on at least one side of the positive current collector 101. By coating the positive active material layer 102 on either or both sides of the positive current collector 101, Figure 5 The diagram shows that the negative electrode active material layer 302 is coated on one side of the negative electrode current collector 301 to form the positive electrode sheet 1.

[0047] Optionally, the positive electrode active material layer 102 may include lithium nickel cobalt manganese oxide (NCM), lithium iron phosphate (LFP), lithium-rich manganese-based active material, lithium cobalt oxide, lithium manganese oxide, etc., which can be selected adaptively according to the actual cell type, and are not specifically limited here.

[0048] Preferably, when the positive electrode active material layer 102 is coated on any side of the positive electrode current collector 101, the positive electrode active material layer 102 is disposed on the side of the positive electrode current collector 101 close to the solid electrolyte layer 2.

[0049] Please refer to Figure 6Specifically, the negative electrode 3 includes a negative electrode current collector 301 and a negative electrode active material layer 302, wherein the negative electrode active material layer 302 is disposed on at least one side of the negative electrode current collector 301. By coating the negative electrode active material layer 302 on either side or both sides of the negative electrode current collector 301, Figure 6 The negative electrode active material layer 302 is coated on both sides of the negative electrode current collector 301 to form the negative electrode sheet 3.

[0050] Optionally, the negative electrode active material layer 302 may include graphite, soft carbon, hard carbon, silicon-based materials, titanium-based materials, etc., which can be selected according to actual needs, and no specific limitation is made here.

[0051] Preferably, when the negative electrode active material layer 302 is coated on any side of the negative electrode current collector 301, the negative electrode active material layer 302 is disposed on the side of the negative electrode current collector 301 close to the solid electrolyte layer 2.

[0052] Specifically, the materials of the solid electrolyte layer 2 include polymer solid electrolytes, oxide solid electrolytes, sulfide solid electrolytes, metal halide solid electrolytes, etc., which can all be used as molding materials for the solid electrolyte layer 2 to realize the exchange of ions between the positive electrode 1 and the negative electrode 3.

[0053] Specifically, the cross-sectional shape of the aforementioned channel structure 4 can be circular, elliptical, regular polygonal, or irregular, and all of these can serve as the shape of the channel structure 4, thereby enabling the filling of the elastic solid electrolyte 5.

[0054] Optionally, the aperture size of the channel structure 4 can be a constant aperture structure or a unequal aperture structure. That is, the cross-sectional area of ​​the channel structure 4 at different positions can be the same or different, and both can achieve the function of the channel structure 4. No specific limitation is made here.

[0055] Optionally, the cross-sectional area of ​​the channel structure 4 can be from 1 square micrometer to 1000 square micrometers, and can be set according to the size of the cell electrode assembly and specific requirements, so as to achieve the filling function of the elastic solid electrolyte 5. No specific limitation is made here.

[0056] For example, the cross-sectional area of ​​the channel structure 4 is 1 square micrometer, 4 square micrometer, 10 square micrometer, 40 square micrometer, 100 square micrometer, 200 square micrometer, 400 square micrometer, 700 square micrometer, 1000 square micrometer, etc.

[0057] Optionally, the extension path of the pore structure 4 is perpendicular to the positive electrode 1, the solid electrolyte layer 2, and the negative electrode 3, or the extension path of the pore structure 4 is angularly arranged with the positive electrode 1, the solid electrolyte layer 2, and the negative electrode 3.

[0058] Of course, the extension path of the channel structure can be a straight line, a curve, or a broken line, etc., and no specific limitation is made here.

[0059] In this embodiment, the channel structure 4 includes a first channel 401, a second channel 402, and a third channel 403. The first channel 401 is formed on the positive electrode 1, the second channel 402 is formed on the solid electrolyte layer 2, and the third channel 403 is formed on the negative electrode 3. The elastic solid electrolyte 5 is sequentially connected to the pore walls of the first channel 401, the second channel 402, and the third channel 403 to form a continuous filling layer, thereby forming a continuous lithium-ion transport channel. This realizes the connection between the elastic solid electrolyte 5 and the positive electrode 1, the solid electrolyte layer 2, and the negative electrode 3, further improving the rate charge and discharge performance of the solid battery using this cell electrode assembly.

[0060] In an optional embodiment, the elastic solid electrolyte 5 is tightly connected to the pore walls of the channel structure 4, meaning the elastic solid electrolyte 5 completely fills the channel structure 4. Specifically, the elastic solid electrolyte 5 completely fills the first channel 401, the second channel 402, and the third channel 403, thus achieving a tight connection between the elastic solid electrolyte 5 and the pore walls of the first channel 401, the second channel 402, and the third channel 403. This arrangement enables the formation of ion channels between the positive electrode 1, the solid electrolyte layer 2, and the negative electrode 3 through the elastic solid electrolyte 5, and also enhances the limiting effect of the elastic solid electrolyte 5 on the positive electrode 1, the solid electrolyte layer 2, and the negative electrode 3.

[0061] In an optional embodiment, a gap exists between the elastic solid electrolyte 5 and the pore walls of the pore structure 4, meaning the elastic solid electrolyte 5 is unsaturatedly filled in the pore structure 4. Simultaneously, the elastic solid electrolyte 5 is connected to the pore walls of the first pore 401, the second pore 402, and the third pore 403. This arrangement still allows the formation of ion channels between the positive electrode 1, the solid electrolyte layer 2, and the negative electrode 3 through the elastic solid electrolyte 5, and provides a confining effect on these components. However, its ion conduction performance and confining effect are weaker compared to when the structure is fully filled.

[0062] Furthermore, at least a portion of the gap between the positive electrode 1 and the solid electrolyte layer 2, and / or at least a portion of the gap between the negative electrode 3 and the solid electrolyte layer 2, is filled with a reinforcing solid electrolyte layer 6, which is connected to the elastic solid electrolyte 5. This arrangement not only enables the formation of ion channels and the limiting effect on the positive electrode 1, solid electrolyte layer 2, and negative electrode 3 through the elastic solid electrolyte 5, but also fills the gap between the solid electrolyte layer 2 and the positive electrode 1, and / or the gap between the solid electrolyte layer 2 and the negative electrode 3, thereby increasing the contact area between the solid electrolyte layer 2 and the positive electrode 1, and / or the solid electrolyte layer 2 and the negative electrode 3, thus improving the cycle performance and rate charge / discharge performance of the solid battery using this cell assembly.

[0063] Specifically, by strengthening the connection of the solid electrolyte layer 6 to the positive electrode 1 and the solid electrolyte layer 2 respectively; and / or by strengthening the connection of the solid electrolyte layer 6 to the negative electrode 3 and the solid electrolyte layer 2 respectively, the contact area between the positive electrode 1 and the solid electrolyte layer 2, as well as the contact area between the negative electrode 3 and the solid electrolyte layer 2, can be increased.

[0064] Preferably, the solid electrolyte layer 6 is tightly connected to both the positive electrode 1 and the solid electrolyte layer 2; and / or the solid electrolyte layer 6 is also tightly connected to both the negative electrode 3 and the solid electrolyte layer 2. This improves the contact area between the solid electrolyte layer 2 and the positive electrode 1 and / or between the solid electrolyte layer 2 and the negative electrode 3.

[0065] Optionally, the aforementioned reinforced solid electrolyte layer 6 can be formed by the elastic solid electrolyte 5 overfilling the pore structure 4 and partially overflowing, or it can be formed by adding another layer; no specific limitation is made here.

[0066] This embodiment also provides a solid-state battery, which includes the cell electrode assembly for solid-state batteries described in any of the above-described embodiments. Specifically, the cell electrode assembly for solid-state batteries is provided in at least one set. By employing the cell electrode assembly for solid-state batteries, the contact area and contact strength between layers are increased, which largely solves the solid-solid interface contact problem of solid-state batteries, thereby improving the cycle life and rate charge / discharge performance of the battery. For example, a solid-state battery assembled using this cell electrode assembly for solid-state batteries can achieve fast charging at rates from 1.5C to 3C, up to a maximum of 4C, and has a cycle life exceeding 2000 cycles.

[0067] Optionally, the solid-state battery can be any one of a pouch battery, a prismatic battery, or a cylindrical battery, without any specific limitation.

[0068] The following describes some specific embodiments to illustrate the cell electrode assembly and solid-state battery used in solid-state batteries.

[0069] Example 1

[0070] Please refer to Figure 1 This embodiment provides a cell electrode assembly and a solid-state battery for a solid-state battery. The solid-state battery is a pouch battery, specifically including a positive electrode 1, a solid electrolyte layer 2, a negative electrode 3, at least one channel structure 4, and at least one elastic solid electrolyte 5. The positive electrode 1, the solid electrolyte layer 2, and the negative electrode 3 are formed by a stacking process. In this embodiment, the positive electrode 1 and the negative electrode 3 are set as one group. The channel structure 4 penetrates through the positive electrode 1, the solid electrolyte layer 2, and the negative electrode 3. The cross-sectional shape of the channel structure 4 is circular, the channel diameter is 10 micrometers, and the spacing between adjacent channels is 20 micrometers. The channel structure 4 is at least partially filled with the elastic solid electrolyte 5. The elastic solid electrolyte 5 is a PEO (polyethylene oxide) polymer electrolyte, and the elastic solid electrolyte 5 completely fills the channel structure 4.

[0071] Example 2

[0072] Please refer to Figure 2 and Figure 3 This embodiment provides a cell electrode assembly and a solid-state battery for a solid-state battery. The solid-state battery is a prismatic battery, specifically including a positive electrode 1, a solid electrolyte layer 2, a negative electrode 3, at least one channel structure 4, and at least one elastic solid electrolyte 5. The positive electrode 1, the solid electrolyte layer 2, and the negative electrode 3 are formed by a stacking process. In this embodiment, the positive electrode 1 and the negative electrode 3 are set in two groups, and the solid electrolyte layer 2 is Z-folded between the positive electrode 1 and the negative electrode 3. At the same time, solid electrolyte layers 2 are provided on both sides of the outermost positive electrode 1 and both sides of the outermost negative electrode 3. The channel structure 4 penetrates through the positive electrode 1, the solid electrolyte layer 2, and the negative electrode 3. The cross-sectional shape of the channel structure 4 is circular, the channel diameter is 10 micrometers, and the spacing between adjacent channels is 20 micrometers. The channel structure 4 is at least partially filled with elastic solid electrolyte 5. The elastic solid electrolyte 5 is an SN (succinate-butadiene) polymer electrolyte. The elastic solid electrolyte 5 is overfilled in the channel structure 4 and overflows to form a reinforcing solid electrolyte layer 6.

[0073] Example 3

[0074] Please refer to Figure 4This embodiment provides a cell electrode assembly and a solid-state battery for a solid-state battery. The solid-state battery is a cylindrical battery, specifically including a positive electrode 1, a solid electrolyte layer 2, a negative electrode 3, at least one channel structure 4, and at least one elastic solid electrolyte 5. The positive electrode 1, the solid electrolyte layer 2, and the negative electrode 3 are formed by a winding process. In this embodiment, the positive electrode 1 and the negative electrode 3 are set as one group. At the same time, solid electrolyte layers 2 are provided on both sides of the outermost positive electrode 1 and both sides of the outermost negative electrode 3. The channel structure 4 penetrates through the positive electrode 1, the solid electrolyte layer 2, and the negative electrode 3. The cross-sectional shape of the channel structure 4 is square, the channel diameter is 10 micrometers, and the spacing between adjacent channels is 40 micrometers. The channel structure 4 is at least partially filled with elastic solid electrolyte 5. The elastic solid electrolyte 5 is a composite electrolyte of LGPS sulfide and PEO polymer, and the elastic solid electrolyte 5 completely fills the channel structure 4.

[0075] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A cell electrode assembly for a solid-state battery, characterized in that, It includes a positive electrode (1), a solid electrolyte layer (2) and a negative electrode (3), wherein the positive electrode (1), the solid electrolyte layer (2) and the negative electrode (3) are arranged in sequence; It also includes at least one channel structure (4) that extends through the positive electrode (1), the solid electrolyte layer (2) and the negative electrode (3), and the channel structure (4) is at least partially filled with an elastic solid electrolyte (5) so that the elastic solid electrolyte (5) is connected to the positive electrode (1), the solid electrolyte layer (2) and the negative electrode (3).

2. The cell electrode assembly for a solid-state battery according to claim 1, characterized in that, The channel structure (4) includes a first channel (401), a second channel (402) and a third channel (403). The first channel (401) is formed on the positive electrode (1), the second channel (402) is formed on the solid electrolyte layer (2), and the third channel (403) is formed on the negative electrode (3). The elastic solid electrolyte (5) is sequentially connected to the pore walls of the first channel (401), the second channel (402) and the third channel (403) to form a continuous filling layer.

3. The cell electrode assembly for a solid-state battery according to claim 1, characterized in that, The elastic solid electrolyte (5) is tightly connected to the pore wall of the pore structure (4).

4. The cell electrode assembly for a solid-state battery according to claim 1, characterized in that, At least a portion of the gap between the positive electrode (1) and the solid electrolyte layer (2) and / or at least a portion of the gap between the negative electrode (3) and the solid electrolyte layer (2) is filled with a reinforced solid electrolyte layer (6), which is connected to the elastic solid electrolyte (5).

5. The cell electrode assembly for a solid-state battery according to claim 4, characterized in that, The reinforced solid electrolyte layer (6) is connected to the positive electrode (1) and the solid electrolyte layer (2) respectively; and / or, The reinforced solid electrolyte layer (6) is connected to the negative electrode (3) and the solid electrolyte layer (2) respectively.

6. The cell electrode assembly for a solid-state battery according to claim 1, characterized in that, The cross-sectional shape of the channel structure (4) is circular, elliptical, regular polygonal or irregular.

7. The cell electrode assembly for a solid-state battery according to claim 1, characterized in that, The positive electrode (1), the solid electrolyte layer (2), and the negative electrode (3) are assembled by a stacking process or a winding process.

8. The cell electrode assembly for a solid-state battery according to claim 1, characterized in that, The positive electrode sheet (1) includes a positive current collector (101) and a positive active material layer (102), wherein the positive active material layer (102) is disposed at least on one side of the positive current collector (101); and / or, The negative electrode sheet (3) includes a negative electrode current collector (301) and a negative electrode active material layer (302), wherein the negative electrode active material layer (302) is disposed on at least one side of the negative electrode current collector (301).

9. The cell electrode assembly for a solid-state battery according to claim 8, characterized in that, The positive electrode active material layer (102) is disposed on the side of the positive electrode current collector (101) near the solid electrolyte layer (2); and / or, The negative electrode active material layer (302) is disposed on the side of the negative electrode current collector (301) close to the solid electrolyte layer (2).

10. A solid-state battery, characterized in that, Includes the cell electrode assembly for solid-state batteries as described in any one of claims 1-9.

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