Solid-state battery cell and battery
By setting protrusions and grooves on the surfaces of the electrode and the solid electrolyte layer to form a snap-fit connection, the problem of unstable interface contact between the solid electrolyte and the electrode is solved, internal resistance is reduced, and battery performance is improved.
Patent Information
- Application Number
- CN202422899514.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2034-11-27
AI Technical Summary
Unstable interfacial contact between the solid electrolyte and the electrode leads to increased internal resistance of the cell, increased lithium-ion transport path, and easy slippage and expansion after electrode thickness rebound, affecting battery performance.
By setting raised structures on the electrode surface and corresponding groove structures on the solid electrolyte layer surface, a snap-fit connection is formed, which increases the contact area, reduces the lithium ion migration distance, and promotes lithium ion diffusion.
It improves the problem of unstable interface contact, alleviates electrode expansion and slippage, reduces battery internal resistance, improves lithium-ion transfer efficiency, and enhances battery performance.
Smart Images
Figure CN223757498U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery technology field, concretely relates to a solid state battery cell and battery. BACKGROUND
[0002] In the design process of solid state bare battery cell, the interface contact between solid state electrolyte and pole piece is unstable, which is a core problem, and the poor contact between solid state electrolyte layer and pole piece surface not only leads to the increase of battery cell internal resistance, the increase of lithium ion transmission path and other conditions, in addition, the rebound of pole piece thickness easily leads to the slippage between solid state electrolyte layer and pole piece, the swelling or loosening of roll core and other adverse conditions, thereby leading to the performance attenuation of battery. SUMMARY
[0003] To solve the above problems, the utility model provides a solid state battery cell and battery, through the design of positive pole piece, negative pole piece and solid state electrolyte layer structure, the contact area between solid state electrolyte and pole piece can be increased, thereby effectively improving the interface contact instability between solid state electrolyte and pole piece and the problems such as roll core swelling and slippage between layers, and the lithium ion migration distance can be reduced and the lithium ion contact site can be increased to promote the diffusion and transmission of lithium ion.
[0004] Specifically, the following technical solutions are provided:
[0005] The utility model discloses a solid state battery cell in the first aspect, including positive pole piece, negative pole piece and the solid state electrolyte layer of setting between the positive pole piece with the negative pole piece,
[0006] The positive pole piece is provided with a first protruding structure on the side adhering to the solid state electrolyte layer, and the negative pole piece is provided with a second protruding structure on the side adhering to the solid state electrolyte layer.
[0007] The solid state electrolyte layer is provided with a first recess structure on the side adhering to the positive pole piece, and the first recess structure is embedded with the first protruding structure, and the solid state electrolyte layer is provided with a second recess structure on the side adhering to the negative pole piece, and the second protruding structure is embedded with the second recess structure.
[0008] In some preferred embodiments, the height of the first protruding structure is less than or equal to the depth of the first recess structure, and the height of the second protruding structure is less than or equal to the depth of the second recess structure.
[0009] In some preferred embodiments, the depth of the first recess structure and the second recess structure is less than half of the thickness of the solid state electrolyte layer.
[0010] In some preferred embodiments, the first groove structure comprises one or more parallel and spaced sub-grooves, and the first protrusion structure comprises one or more parallel and spaced sub-protrusions corresponding to the first groove structure; the second groove structure comprises one or more parallel and spaced sub-grooves, and the second protrusion structure comprises one or more parallel and spaced sub-protrusions corresponding to the second groove structure.
[0011] In some preferred embodiments, the spacing between adjacent sub-grooves in the first groove structure and the second groove structure is 100-500 μm; the width of a sub-groove in the first groove structure and the second groove structure is 50-300 μm; and the depth of a sub-groove in the first groove structure and the second groove structure is 10-150 μm.
[0012] In some preferred embodiments, the ratio of the area of the first groove structure to the single-face area of the solid-state electrolyte layer is 5%-20%, and the ratio of the area of the second groove structure to the single-face area of the solid-state electrolyte layer is 5%-20%.
[0013] In some preferred embodiments, the height of a sub-protrusion in the first protrusion structure and the second protrusion structure is 10-140 μm; and the width of a sub-protrusion in the first protrusion structure and the second protrusion structure is 50-300 μm.
[0014] In some preferred embodiments, the ratio of the area of the first protrusion structure to the single-face area of the positive electrode tab is 5%-45%, and the ratio of the area of the second protrusion structure to the single-face area of the negative electrode tab is 5%-45%.
[0015] In some preferred embodiments, the positive electrode tab comprises a current collector and a positive electrode active layer disposed on at least one side of the current collector along the second direction; the positive electrode active layer is in contact with the solid-state electrolyte layer; the thickness of the current collector is 8-20 μm; the thickness of the positive electrode active layer is 50-300 μm; the areal density of the positive electrode active layer is 0.130-0.325 mg / mm 2 ; more preferably, the positive electrode active layer is provided with granular first positive electrode active particles, and the first protrusion structure is provided with granular second positive electrode active particles; the particle size of the first positive electrode active particles is larger than the particle size of the second positive electrode active particles; the first positive electrode active particles are ternary NCM, and the second positive electrode active particles are LFP, LFMP or ternary NCM622.
[0016] In some preferred embodiments, the positive electrode tab is provided with a first adhesive layer on the surface in contact with the solid-state electrolyte layer; more preferably, the thickness of the first adhesive layer is 0-3 μm, and the material of the first adhesive layer is PVDF.
[0017] In some preferred embodiments, the solid-state electrolyte layer is provided with a first composite solid-state layer on the surface in contact with the positive electrode tab; more preferably, the thickness of the first composite solid-state layer is 100 nm-5 μm, and the material of the first composite solid-state layer is a sulfide-based solid-state electrolyte.
[0018] In some preferred embodiments, the solid-state electrolyte layer is provided with a second composite solid-state layer on the surface in contact with the negative electrode tab; more preferably, the thickness of the first composite solid-state layer is 100 nm-5 μm, and the material of the second composite solid-state layer is a sulfide-based solid-state electrolyte.
[0019] In some preferred embodiments, the material of the solid-state electrolyte layer is a polymer-based solid-state electrolyte, an oxide-based solid-state electrolyte or a sulfide-based solid-state electrolyte; when the material of the solid-state electrolyte layer is a polymer-based solid-state electrolyte, the thickness of the solid-state electrolyte layer is 50-250 μm; when the material of the solid-state electrolyte layer is an oxide-based solid-state electrolyte or a sulfide-based solid-state electrolyte, the thickness of the solid-state electrolyte layer is 1-3 mm.
[0020] In some preferred embodiments, the negative electrode tab comprises a current collector and a negative electrode active layer provided on at least one side of the current collector along the second direction; the negative electrode active layer is in contact with the solid-state electrolyte layer; the thickness of the current collector is 4-20 μm; the thickness of the negative electrode active layer is 100-500 μm; the area density of the negative electrode active layer is 0.078-0.156 mg / mm 2 ; more preferably, the negative electrode active layer is provided with granular first negative electrode active particles, and the second protruding structure is provided with granular second negative electrode active particles; the particle size of the second negative electrode active particles is greater than that of the second negative electrode active particles; the first negative electrode active particles are graphite, and the second negative electrode active particles are hard carbon or graphite.
[0021] In some preferred embodiments, the negative electrode tab is provided with a second adhesive layer on the surface in contact with the solid-state electrolyte layer; more preferably, the thickness of the second adhesive layer is 0-3 μm; and the material of the second adhesive layer is CMC, SBR or PAA.
[0022] The utility model discloses a second aspect provides a kind of battery, comprising the solid-state battery of first aspect described.
[0023] Compared with the prior art, the utility model has the advantages that:
[0024] The utility model discloses a kind of solid-state battery, including positive pole piece, solid-state electrolyte layer and negative pole piece, the positive pole piece is provided with first protruding structure, the solid-state electrolyte layer is provided with first recess structure, the negative pole piece is provided with second protruding structure, the first protruding structure is provided with first adhesive layer, the first recess structure is provided with second adhesive layer, the second protruding structure is provided with second adhesive layer. BRIEF DESCRIPTION OF DRAWINGS
[0025] Figure 1 It is a kind of exploded structure of section schematic diagram of solid-state battery for the utility model embodiment one;
[0026] Figure 2 It is the section schematic diagram of positive pole piece of which first adhesive layer is provided in protruding structure side in solid-state battery for the utility model embodiment two;
[0027] Figure 3 It is the section schematic diagram of solid-state electrolyte layer of which second composite solid-state layer is deposited in solid-state battery for the utility model embodiment three;
[0028] Figure 4 It is the section schematic diagram of negative pole piece of which second adhesive layer is provided in protruding structure side in solid-state battery for the utility model embodiment four;
[0029] Figure 5 It is another kind of exploded structure of section schematic diagram of solid-state battery for the utility model embodiment five;
[0030] Figure mark: 1-positive pole piece, 2-solid-state electrolyte layer, 3-negative pole piece, 11-first protruding structure, 12-first adhesive layer, 21-first recess structure, 22-second recess structure, 23-first composite solid-state layer, 24-second composite solid-state layer, 31-second protruding structure, 32-second adhesive layer. DETAILED DESCRIPTION
[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. The use herein of the terms "including", "comprising", "having" and the like are meant to encompass the items listed thereafter as well as other items. The use herein of the terms "including", "comprising", "having" and the like are meant to encompass the items listed thereafter as well as other items.
[0032] The application will be further described below with reference to the drawings and specific embodiments, so that those skilled in the art can better understand the application and implement it. The embodiments are not intended to limit the application.
[0033] Embodiment one
[0034] With reference to Figure 1 , the embodiment one of the application provides a solid-state cell, comprising a positive electrode sheet 1, a negative electrode sheet 3 and a solid-state electrolyte layer 2 arranged between the positive electrode sheet 1 and the negative electrode sheet 3; wherein the positive electrode sheet 1 is provided with a first protruding structure 11 on a surface adhering to the solid-state electrolyte layer 2, the negative electrode sheet 3 is provided with a second protruding structure 31 on a surface adhering to the solid-state electrolyte layer 2, correspondingly, the solid-state electrolyte layer 2 is provided with a first recess structure 21 on a surface adhering to the positive electrode sheet 1, the first recess structure 21 is embedded with the first protruding structure 11, at the same time, the solid-state electrolyte layer 2 is provided with a second recess structure 22 on a surface adhering to the negative electrode sheet 3, the second recess structure 22 is embedded with the second protruding structure 31. In the solid-state battery provided by the embodiment one of the application, the positive electrode sheet and the negative electrode sheet are tightly connected through the protruding structures arranged on the surfaces and the solid-state electrolyte layer with the corresponding recess structures arranged on the surfaces, on one hand, the problems such as sheet expansion and electrolyte layer sliding in the process of battery charging and discharging can be relieved, so as to effectively improve the unstable interface contact problem between the solid-state electrolyte layer and the sheet; in addition, compared with the conventional solid-state cell, the solid-state cell provided by the embodiment can increase the contact area between the solid-state electrolyte layer and the sheet, so as to increase the lithium ion contact points, which is more conducive to lithium ion diffusion and transmission; in addition, compared with the solid-state electrolyte layer without recess structure or with one-face recess structure / one-face protruding structure, the solid-state electrolyte layer with double-face recess structure can obviously reduce the lithium ion migration distance in the second direction, which is conducive to improving the electrochemical performance and energy density of the battery.
[0035] In this embodiment, the height of the first protrusion structure 11 is less than the depth of the first groove structure 21, and the height of the second protrusion structure 31 is less than the depth of the second groove structure 22, so that after the protrusion structure and the corresponding groove structure are embedded, there is a certain redundant space, which can avoid physical extrusion between the protrusion structure and the solid electrolyte layer during the subsequent hot pressing process, thereby preventing interface wear or breakage. In addition, the redundant space formed can better adapt to high volume change material systems, such as high nickel / silicon-based systems, thereby relieving the expansion of the core.
[0036] In addition, the depth of the first groove structure 21 and the second groove structure 22 is less than half the thickness of the solid electrolyte layer 2, so as to avoid direct contact between the positive and negative electrode sheets and short circuit.
[0037] In this embodiment, the first groove structure 21 includes a plurality of parallel and spaced sub-grooves, and the first protrusion structure 11 includes a plurality of parallel and spaced sub-protrusions corresponding to the first groove structure 21. The second groove structure 22 includes a plurality of parallel and spaced sub-grooves, and the second protrusion structure 31 includes a plurality of parallel and spaced sub-protrusions corresponding to the second groove structure 22, so that the positive and negative electrode sheets can better adhere to the solid electrolyte, which is beneficial to avoid the sheet level slip during the assembly of the core.
[0038] In some embodiments, the first groove structure 21 and the second groove structure 22 can be obtained by laser etching technology on both sides of the solid electrolyte layer. The laser etching can use ultra-short strong laser pulses with a pulse energy of 1-20 μJ, a laser power of 1-20 W, a laser scanning speed of 10-200 mm / s, and an etching time of 0.1-15 s. The first groove structure 21 and the second groove structure 22 each containing a plurality of sub-grooves are formed on both sides of the solid electrolyte layer 2. The depth of the sub-grooves in the first groove structure 21 and the second groove structure 22 is 10-150 μm, for example, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, etc. The width of the sub-grooves is 50-300 μm, for example, 50 μm, 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, etc. The interval between adjacent sub-grooves is 100-500 μm, for example, 100 μm, 200 μm, 300 μm, 400 μm, 500 μm, etc. The etching area of a single sub-groove is A, the total etching area of the first groove structure 21 is A1, the total etching area of the second groove structure 22 is A2, and the area of a single side of the solid electrolyte layer is S. Preferably, the ratio of A1 / S is 5%-20%, and the ratio of A2 / S is 5%-20%.
[0039] In addition, the first protruding structure 11 and the second protruding structure 31 can be obtained by transfer coating on the corresponding pole piece through a micro-concave roller (vertically engraved with corresponding deep and shallow stripes) or prepared by roller shaping. Preferably, the height of each sub-protrusion in the first protruding structure 11 and the second protruding structure 31 is 10-140 μm, for example, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, and the width is 50-300 μm, and the interval between adjacent sub-protrusions is 100-500 μm, which is consistent with the groove structure of the surface of the solid electrolyte layer 3; the ratio of the area of the first protruding structure 11 to the area of the positive pole piece 1 single side (second direction) is 5%-45%, and the ratio of the area of the second protruding structure 31 to the area of the negative pole piece 3 single side (second direction) is 5%-45%.
[0040] In this embodiment, the positive pole piece 1 includes a current collector and a positive active layer disposed on one side of the current collector, which is in contact with the solid electrolyte layer 2; wherein the current collector can be a pure aluminum foil or a composite foil material, and the thickness is 8-20 μm, the thickness of the positive active layer is 50-300 μm, and the area density of the positive active layer is 0.130-0.325 mg / mm 2 .
[0041] Further, the above-mentioned positive active layer is provided with granular first positive active particles, and the first protruding structure is provided with granular second positive active particles, wherein the first positive active particles and the second positive active particles can be the same or different active substances, for example, the first positive active particles can be ternary NCM or iron lithium LFP, and the second positive active particles can be iron lithium LFP, LFMP or ternary NCM622. In some embodiments, the first positive active particles are ternary NCM, and the second positive active particles are iron lithium LFP; the first positive active particles are high-nickel ternary 811, and the second positive active particles are medium-nickel ternary NCM622; the first positive active particles are iron lithium LFP, and the second positive active particles are LFMP.
[0042] More preferably, the particle size of the first positive active particles is larger than that of the second positive active particles, the small-particle active substance with larger specific surface area is arranged in the first protruding structure, the particle diffusion path is shorter, which is beneficial to the full utilization of the particles, and at the same time, the large-particle active substance is arranged in the positive active layer, the larger size of the positive active particles can reduce the diffusion path between the particles, which is more beneficial to the diffusion of lithium ions, and by arranging different particle sizes of positive active particles in different structures, it is beneficial to improve the battery rate and meet the fast charging performance.
[0043] In the embodiment, the material of the solid electrolyte layer 2 can be a polymer-based solid electrolyte, an oxide-based solid electrolyte, or a sulfide-based solid electrolyte; when the material of the solid electrolyte layer is a polymer-based solid electrolyte, the thickness of the solid electrolyte layer is 50-250 μm; when the material of the solid electrolyte layer is an oxide-based solid electrolyte or a sulfide-based solid electrolyte, the thickness of the solid electrolyte layer is 1-3 mm.
[0044] In the embodiment, the negative electrode tab 3 includes a current collector and a negative electrode active layer arranged on one side of the current collector, and the negative electrode active layer is attached to the solid electrolyte layer 2; wherein the current collector can be a pure copper foil or a composite foil material, and the thickness of the current collector is 4-20 μm; the thickness of the negative electrode active layer is 50-300 μm, and the area density of the negative electrode active layer is 0.078-0.156 mg / mm 2 .
[0045] Further, the negative electrode active layer is provided with granular first negative electrode active particles, and the second protruding structure is provided with granular second negative electrode active particles; wherein the first negative electrode active particles and the second negative electrode active particles can be the same or different negative electrode active materials, for example, the first negative electrode active particles are graphite, and the second negative electrode active particles can be hard carbon or graphite; when both the particles are graphite, the graphite as the first negative electrode active particles is a capacity-type graphite, and the graphite as the second negative electrode active particles is a fast-charging-type graphite, or the graphite as the first negative electrode active particles is a large-particle-size-distribution graphite, and the graphite as the second negative electrode active particles is a small-particle-size-distribution graphite.
[0046] Embodiment two
[0047] The embodiment two of the utility model provides a kind of solid-state battery, and the difference with embodiment one is only in that: refer to Figure 2 The positive electrode tab 1 is provided with the first adhesive layer 12 on the surface attached to the solid electrolyte layer 2, which can enhance the hardness of the winding core, improve the adhesion of the hierarchical piece, and further alleviate the problems of tab expansion and sliding between layers; And the adhesive layer can provide sufficient hot melt bonding effect in the subsequent hot pressing process, inhibit the expansion of the winding core.
[0048] Preferably, the material of the first adhesive layer 12 can be common PVDF, with a thickness less than 3 μm.
[0049] In some embodiments, the first adhesive layer 12 can be prepared on the side of the positive electrode tab 1 provided with the first protruding structure 11 by gravure coating, high-speed rotor spraying or CVD deposition, etc.
[0050] Embodiment three
[0051] The embodiment three of the utility model provides a kind of solid-state battery, and the difference with embodiment one is only in that: refer toFigure 3 The solid-state electrolyte layer is provided with a first composite solid-state layer 23 on the surface attached to the positive electrode sheet and a second composite solid-state layer 24 on the surface attached to the negative electrode sheet.
[0052] Preferably, the first composite solid-state layer 23 and the second composite solid-state layer 24 are both sulfide-based solid-state electrolytes with a thickness of 100 nm-5 μm.
[0053] In some embodiments, the solid-state electrolyte layer 2 is a polymer-based solid-state electrolyte with high ionic conductivity and good flexibility, which can highly adapt to the volume change of the electrode sheet and meet the etching conditions; the first composite solid-state layer 23 and the second composite solid-state layer 24 are both sulfide-based solid-state electrolytes with high ionic conductivity and good contact with the electrode. The above composite solid-state layers can effectively alleviate the poor contact between the solid-state electrolyte layer and the electrode sheet, reduce the battery interface resistance, and achieve the effect of 1+1>2.
[0054] Further, the first composite solid-state layer 23 and the second composite solid-state layer 24 can be prepared by spraying or CVD deposition.
[0055] Embodiment Four
[0056] The solid-state battery of the fourth embodiment of the present application is different from the first embodiment only in that Figure 4 The negative electrode sheet 3 is provided with a second adhesive layer 32 on the surface attached to the solid-state electrolyte layer 2. The adhesive layer can enhance the hardness of the roll core, improve the adhesion of the layered components, and further alleviate the problems of electrode sheet expansion and sliding between layers. The adhesive layer can provide sufficient hot melt bonding effect in the subsequent hot pressing process and inhibit the expansion of the roll core.
[0057] Preferably, the material of the second adhesive layer 32 can be CMC, SBR or PAA, and the thickness is less than 3 μm.
[0058] In some embodiments, the second adhesive layer 32 can be prepared on the side of the negative electrode sheet 32 provided with the first protruding structure 31 by gravure coating, high-speed rotor spraying or CVD deposition.
[0059] Embodiment Five
[0060] The solid-state battery of the fifth embodiment of the present application is different from the first embodiment in that Figure 5The positive pole piece 1 is provided with a first adhesive layer 12 on the surface attached to the solid-state electrolyte layer 2; the solid-state electrolyte layer is provided with a first composite solid-state layer 23 on the surface attached to the positive pole piece and a second composite solid-state layer 24 on the surface attached to the negative pole piece; and the negative pole piece 3 is provided with a second adhesive layer 32 on the surface attached to the solid-state electrolyte layer 2. Under the action of the first and second adhesive layers, the problems of pole piece expansion and layer-to-layer slippage can be further alleviated, and under the action of the first and second composite solid-state layers, the problems of poor interface contact and high interface resistance between the pole piece and the solid-state electrolyte layer can be further improved.
[0061] To sum up, the solid-state battery cell provided by the utility model can form a buckle structure when the pole piece and the solid-state electrolyte layer are assembled, which can not only effectively improve the unstable interface contact between the solid-state electrolyte and the pole piece, the pole piece expansion and the layer-to-layer slippage, but also reduce the lithium ion migration distance and promote the diffusion and transmission of lithium ions, thereby improving the electrochemical performance of the battery.
[0062] The above-described embodiments are only preferred examples for fully illustrating the utility model, and the protection scope of the utility model is not limited thereto. Any equivalent replacement or transformation of the utility model on the basis of the utility model is within the protection scope of the utility model. The protection scope of the utility model is subject to the claims.
Claims
1. A solid state cell, characterized by, The positive electrode tab, the negative electrode tab, and a solid-state electrolyte layer arranged between the positive electrode tab and the negative electrode tab; The positive electrode tab is provided with a first protruding structure on a surface in contact with the solid-state electrolyte layer, and the negative electrode tab is provided with a second protruding structure on a surface in contact with the solid-state electrolyte layer; The solid-state electrolyte layer is provided with a first groove structure on a surface in contact with the positive electrode tab, and the first protruding structure is embedded in the first groove structure; the solid-state electrolyte layer is provided with a second groove structure on a surface in contact with the negative electrode tab, and the second protruding structure is embedded in the second groove structure.
2. The solid state electric cell of claim 1, wherein, The height of the first protruding structure is less than or equal to the depth of the first groove structure; the height of the second protruding structure is less than or equal to the depth of the second groove structure; and the depth of the first groove structure and the depth of the second groove structure are both less than half the thickness of the solid-state electrolyte layer; The first groove structure comprises one or more parallel and spaced sub-grooves, and the first protruding structure comprises one or more parallel and spaced sub-protrusions corresponding to the first groove structure; The second groove structure comprises one or more parallel and spaced sub-grooves, and the second protruding structure comprises one or more parallel and spaced sub-protrusions corresponding to the second groove structure.
3. The solid state electric cell of claim 2, wherein, The spacing between adjacent sub-grooves in the first groove structure and the second groove structure is 100-500 μm; The width of the sub-grooves in the first groove structure and the second groove structure is 50-300 μm; The depth of the sub-grooves in the first groove structure and the second groove structure is 10-150 μm; The ratio of the area of the first groove structure to the area of a single surface of the solid-state electrolyte layer is 5%-20%, and the ratio of the area of the second groove structure to the area of a single surface of the solid-state electrolyte layer is 5%-20%.
4. The solid state electric cell of claim 2, wherein, The height of the sub-protrusions in the first protruding structure and the second protruding structure is 10-140 μm; The width of the sub-protrusions in the first protruding structure and the second protruding structure is 50-300 μm; The ratio of the area of the first protruding structure to the area of a single surface of the positive electrode tab is 5%-45%, and the ratio of the area of the second protruding structure to the area of a single surface of the negative electrode tab is 5%-45%.
5. The solid state electric cell of claim 1, wherein, The positive electrode tab comprises a current collector and a positive electrode active layer arranged on at least one surface of the current collector along a second direction; the positive electrode active layer is in contact with the solid-state electrolyte layer; The thickness of the current collector is 8-20 μm; the thickness of the positive electrode active layer is 50-300 μm; the area density of the positive electrode active layer is 0.130-0.325 mg / mm 2 ; The positive electrode active layer is provided with granular first positive electrode active particles, and the first protruding structure is provided with granular second positive electrode active particles.
6. The solid state electric cell of claim 5, wherein, The particle size of the first positive electrode active particles is greater than the particle size of the second positive electrode active particles; The first positive electrode active particles are ternary NCM, and the second positive electrode active particles are LFP, LFMP, or ternary NCM622.
7. The solid state electric cell of claim 1, wherein, The positive electrode tab is provided with a first adhesive layer on a surface in contact with the solid-state electrolyte layer; The thickness of the first adhesive layer is 0-3 μm; The material of the first adhesive layer is PVDF.
8. The solid state electric cell of claim 1, wherein, The solid-state electrolyte layer is provided with a first composite solid-state layer on the surface attached to the positive electrode plate; the thickness of the first composite solid-state layer is 100 nm-5 μm, and the material of the first composite solid-state layer is sulfide-based solid-state electrolyte; The solid-state electrolyte layer is provided with a second composite solid-state layer on the surface attached to the negative electrode plate; the thickness of the first composite solid-state layer is 100 nm-5 μm, and the material of the second composite solid-state layer is sulfide-based solid-state electrolyte; The material of the solid-state electrolyte layer is polymer-based solid-state electrolyte, oxide-based solid-state electrolyte or sulfide-based solid-state electrolyte; when the material of the solid-state electrolyte layer is polymer-based solid-state electrolyte, the thickness of the solid-state electrolyte layer is 50-250 μm; when the material of the solid-state electrolyte layer is oxide-based solid-state electrolyte or sulfide-based solid-state electrolyte, the thickness of the solid-state electrolyte layer is 1-3 mm.
9. The solid state electric cell of claim 1, wherein, The negative electrode plate comprises a current collector and a negative electrode active layer provided on at least one side of the current collector along the second direction; the negative electrode active layer is attached to the solid-state electrolyte layer; The thickness of the current collector is 4-20 μm; the thickness of the negative electrode active layer is 100-500 μm; the area density of the negative electrode active layer is 0.078-0.156 mg / mm 2 ; The negative electrode active layer is provided with granular first negative electrode active particles, and the second protruding structure is provided with granular second negative electrode active particles.
10. The solid state electric cell of claim 9, wherein, The particle size of the second negative electrode active particles is greater than the particle size of the second negative electrode active particles; The first negative electrode active particles are graphite, and the second negative electrode active particles are hard carbon or graphite.
11. The solid state electric cell of claim 1, wherein, The negative electrode plate is provided with a second adhesive layer on the surface attached to the solid-state electrolyte layer; The thickness of the second adhesive layer is 0-3 μm; The material of the second adhesive layer is CMC, SBR or PAA.
12. A battery, characterized by A solid-state battery cell comprising the solid-state battery cell of any one of claims 1-11.