Solid-state lithium ion battery cell unit, solid-state lithium ion battery cell assembly and solid-state lithium ion battery

Abstract

The invention relates to a solid-state lithium ion battery cell unit, a solid-state lithium ion battery cell assembly and a solid-state lithium ion battery. The solid-state lithium ion battery cell unit comprises a positive pole piece, a solid-state electrolyte membrane and a negative pole piece which are stacked in sequence; orthographic projections of the positive pole piece on the negative pole piece and the solid electrolyte membrane are completely located in the ranges of the negative pole piece and the solid electrolyte membrane, so that an annular overhang area is formed in the circumferential directions of the negative pole piece and the solid electrolyte membrane; a functional member and an insulating member are provided in the over-hang region. The insulating component can provide enough mechanical supporting strength for the overhang area, and the pole piece is prevented from being deformed or dislocated in the isostatic pressing process, so that the production yield of the battery cell is improved; and the functional parts can be set as some functional substances for optimizing the internal environment of the battery, so that the smooth discharge of gas in the pressing process is ensured, and the long-term cycling stability and reliability of the solid-state lithium ion battery are jointly ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium ion batteries, in particular to a solid-state lithium ion battery cell unit, a solid-state lithium ion battery cell assembly and a solid-state lithium ion battery. BACKGROUND

[0002] Solid-state lithium ion batteries are considered an important development direction of next-generation energy storage technology due to their high energy density and high safety. The basic cell structure includes a positive electrode, a negative electrode and a solid-state electrolyte film placed between them. In order to improve the safety of the battery and prevent short circuits caused by contact between the positive and negative electrodes, an area design of "negative electrode > positive electrode" (i.e. the negative electrode has an Overhang region) is usually adopted, and an insulating member is arranged in the Overhang region for physical isolation.

[0003] The commonly used insulating member is usually designed as a whole, and the entire insulating member is a whole composed of the same material. The production of solid-state batteries relies on isostatic pressing process, and the aforementioned insulating member structure faces a dilemma: if the mechanical strength of the insulating member is insufficient, it is easy to cause the insulating member to break or be damaged during isostatic pressing, losing the insulation protection function; if the insulating member is too dense and too rigid, it will hinder the discharge of gas inside the cell during pressing, and the residual gas will affect the interface contact between the electrode and the electrolyte, thereby causing the battery resistance to increase and the performance to decrease. Therefore, it is crucial to develop an insulating member structure that can meet the mechanical requirements of isostatic pressing process and the exhaust requirements at the same time, in order to improve the production yield and overall performance of solid-state battery cells. SUMMARY

[0004] Therefore, it is necessary to provide a solid-state lithium ion battery cell unit, a solid-state lithium ion battery cell assembly and a solid-state lithium ion battery, which can effectively adapt to the isostatic pressing process, have sufficient mechanical support strength, and ensure smooth discharge of gas during pressing, thereby improving the production yield and electrochemical performance of the battery.

[0005] A solid-state lithium ion battery cell unit, comprising a positive electrode sheet, a solid-state electrolyte film and a negative electrode sheet which are sequentially stacked. The positive electrode sheet is completely located within the range of the negative electrode sheet and the solid-state electrolyte film in the orthographic projection of the negative electrode sheet and the solid-state electrolyte film, so as to form an annular overhang region in the circumferential direction of the negative electrode sheet and the solid-state electrolyte film; a functional member and an insulating member are arranged in the overhang region.

[0006] The solid-state lithium ion battery cell unit has the advantages that: by completely surrounding the positive electrode sheet with the negative electrode sheet to form an overhang region, and arranging the functional member and the insulating member in the region, the structure design enables the battery to have high safety, the insulating member can provide sufficient mechanical support strength for the overhang region, deformation or misplacement of the electrode sheet during isostatic pressing is prevented, and therefore the production yield of the cell is greatly improved; in addition, the functional member can be arranged as some functional substances for optimizing the internal environment of the battery, and the smooth discharge of gas during pressing is ensured, thereby jointly ensuring the long-term cycle stability and reliability of the solid-state lithium ion battery.

[0007] In one of the embodiments, the area ratio of the negative electrode sheet to the solid-state electrolyte film is 0.97-1.03.

[0008] In one of the embodiments, the orthographic projection of the functional member on the solid-state electrolyte film is annular, the orthographic projection of the insulating member on the solid-state electrolyte film is annular, and the functional member and the insulating member are located in the same horizontal plane.

[0009] In one of the embodiments, the outer edge of the insulating member coincides with the outer edge of the solid-state electrolyte film and / or the negative electrode sheet; and / or The functional member is located on the side of the insulating member close to the positive electrode sheet, or the functional member is located on the side of the insulating member away from the positive electrode sheet.

[0010] In one of the embodiments, the offset between any two of the geometric center of the positive electrode sheet, the geometric center of the solid-state electrolyte film, and the geometric center of the negative electrode sheet is less than 3%.

[0011] In one of the embodiments, the functional member comprises a gas absorber and / or a desiccant.

[0012] In one of the embodiments, the orthographic projection of the functional member on the solid-state electrolyte film is annular, the orthographic projection of the insulating member on the solid-state electrolyte film is annular, the functional member and the insulating member are distributed along the thickness direction of the solid-state electrolyte film, and the projection area ratio of the functional member to the insulating member on the solid-state electrolyte film is 0.97-1.03.

[0013] In one of the embodiments, the material of the insulating member comprises a combination of one or more of rubber, polyester, and substituted or unsubstituted polyolefin; The rubber comprises a combination of one or more of styrene-butadiene rubber, nitrile-butadiene rubber, chloroprene rubber, ethylene-propylene rubber, silicone rubber, and fluororubber; The polyester comprises a combination of one or more of polyethylene terephthalate, polybutylene terephthalate, and polyarylate. The substituted or unsubstituted polyolefin includes a combination of one or more of polyethylene, polytetrafluoroethylene, polypropylene, and polyvinyl chloride.

[0014] A solid-state lithium ion battery cell assembly includes a plurality of solid-state lithium ion battery cell units stacked in layers, with a solid-state electrolyte film disposed between adjacent ones of the solid-state lithium ion battery cell units.

[0015] The solid-state lithium ion battery cell assembly of the present application includes a plurality of solid-state lithium ion battery cell units stacked in layers, with the positive electrode sheet completely surrounded by the negative electrode sheet to form an overhang region, and a functional member and an insulating member disposed in the region. This structural design enables the battery to have high safety, and the insulating member can provide sufficient mechanical support strength for the overhang region, preventing the electrode sheet from deforming or mispositioning during isostatic pressing, thereby greatly improving the production yield of the cell. In addition, the functional member can be configured as some functional substances that optimize the internal environment of the battery, ensuring smooth discharge of gas during pressing, and together ensuring the long-term cycle stability and reliability of the solid-state lithium ion battery.

[0016] A solid-state lithium ion battery includes the solid-state lithium ion battery cell assembly described above.

[0017] The solid-state lithium ion battery of the present application includes the solid-state lithium ion battery cell assembly described above, with the positive electrode sheet completely surrounded by the negative electrode sheet to form an overhang region, and a functional member and an insulating member disposed in the region. This structural design enables the battery to have high safety, and the insulating member can provide sufficient mechanical support strength for the overhang region, preventing the electrode sheet from deforming or mispositioning during isostatic pressing, thereby greatly improving the production yield of the cell. In addition, the functional member can be configured as some functional substances that optimize the internal environment of the battery, ensuring smooth discharge of gas during pressing, and together ensuring the long-term cycle stability and reliability of the solid-state lithium ion battery. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of a solid-state lithium ion battery cell unit of a first embodiment of the present application; Figure 2 is a schematic diagram of a solid-state lithium ion battery cell unit of a second embodiment of the present application; Figure 3 is a schematic diagram of a solid-state lithium ion battery cell unit of a third embodiment of the present application; Figure 4 is a schematic diagram of a solid-state lithium ion battery cell unit of a fourth embodiment of the present application; Figure 5This is a schematic diagram of a solid-state lithium-ion battery cell assembly according to an embodiment of the present invention. Detailed Implementation

[0019] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0020] 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 invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] Please see Figure 1 The solid-state lithium-ion battery cell unit 100 of the first embodiment of the present invention includes a positive electrode 110, a solid electrolyte membrane 120, and a negative electrode 130 stacked sequentially. The specific structures of the positive electrode 110, the solid electrolyte membrane 120, and the negative electrode 130 are not limited and are determined according to actual conditions.

[0022] Optionally, in one embodiment, the positive electrode 110 includes a positive current collector layer and a positive active material layer, with the positive active material layer disposed on the positive current collector layer. The positive active material layer may be disposed on one or both sides of the positive current collector layer, depending on actual requirements.

[0023] Optionally, in one embodiment, the negative electrode sheet 130 includes a negative electrode active material layer and a negative electrode current collector layer, with the negative electrode active material layer disposed on the negative electrode current collector layer. The negative electrode active material layer may be disposed on one or both sides of the negative electrode current collector layer, depending on actual requirements.

[0024] In the solid-state lithium-ion battery cell unit 100 of the above embodiment, the orthogonal projections of the positive electrode 110 onto the negative electrode 130 and the solid electrolyte membrane 120 are completely located within the range of the negative electrode 130 and the solid electrolyte membrane 120, thereby forming an annular overhang region 140 in the circumferential direction of the negative electrode 130 and the solid electrolyte membrane 120; a functional component 150 and an insulating component 160 are provided in the overhang region 140. The functional component 150 can be configured as a functional material that optimizes the internal environment of the battery, ensuring the smooth discharge of gas during the pressing process.

[0025] The solid-state lithium-ion battery cell 100 of this embodiment forms an overhang region 140 by completely surrounding the positive electrode 110 with the negative electrode 120. Functional components 150 and insulating components 160 are provided in this region. This structural design enables the battery to have high safety while the insulating component 160 can provide sufficient mechanical support strength for the overhang region 140, preventing the electrode from deforming or misaligning during isostatic pressing, thereby greatly improving the production yield of the cell. In addition, the functional component 150 can be set as some functional materials to optimize the internal environment of the battery, ensuring the smooth discharge of gas during the pressing process, and jointly ensuring the long-term cycle stability and reliability of the solid-state lithium-ion battery.

[0026] Based on the aforementioned embodiments, the area ratio of the negative electrode 130 to the solid electrolyte membrane 120 is 0.97 to 1.03. By controlling the area ratio of the negative electrode 130 to the solid electrolyte membrane 120 within the range of 0.97 to 1.03, making their areas nearly or completely equal, this design first ensures that the pressure applied to the cell during battery stacking and isostatic pressing can be uniformly transmitted to the entire surface of the negative electrode through the solid electrolyte membrane. This effectively avoids stress concentration and local overpressure caused by area differences, thereby preventing electrode deformation, damage to the active material layer, or poor interface contact, significantly improving the cell's production yield and structural integrity. Secondly, this area ratio provides a precise and consistent benchmark for the orderly arrangement of insulating components and functional components in the overhang area, which is conducive to achieving standardized packaging and ensures the stability of the interface structure of the battery during long-term charge-discharge cycles. Ultimately, this lays a solid foundation for the high safety and long cycle life of solid-state batteries.

[0027] Based on the aforementioned embodiments, the orthographic projection of the functional component 150 onto the solid electrolyte membrane 120 is annular, and the orthographic projection of the insulating component 160 onto the solid electrolyte membrane 120 is annular. The functional component 150 and the insulating component 160 are located in the same horizontal plane.

[0028] Based on the aforementioned embodiments, the outer edge of the insulating member 160 coincides with the outer edge of the solid electrolyte membrane 120 and / or the negative electrode sheet 130. This alignment design of the outer edges of the insulating member 160 facilitates the orderly packaging of the battery.

[0029] Based on the aforementioned embodiment, the functional component 150 is located on the side of the insulating member 160 closer to the positive electrode plate 110. That is, in this embodiment, the insulating member 160 is located on the side of the functional component 150 away from the positive electrode plate 110.

[0030] Based on the aforementioned implementation, the offset between each pair of the geometric centers of the positive electrode 110, the solid electrolyte membrane 120, and the negative electrode 130 is less than 3%. This design ensures the high degree of alignment and structural symmetry of each functional layer inside the battery. Its beneficial effects are as follows: First, it ensures that the width of the annular overhang region 140 formed around the negative electrode 130 is uniform, providing a stable and regular mounting base for the insulating component 160 and the functional component 150, avoiding the risk of insufficient local support or insulation failure due to alignment deviation; Second, this highly centered structure facilitates the uniform distribution of pressure across the entire electrode interface during isostatic pressing, effectively preventing electrode wrinkles, active material peeling, or increased interface contact resistance caused by stress concentration, thereby significantly improving the manufacturing yield and structural consistency of the cell; Finally, this precise interlayer alignment provides a uniform and reversible migration path for lithium ions during charging and discharging, reducing the possibility of excessively high local current density or preferential growth of lithium dendrites, fundamentally improving the interface stability and long-cycle performance of solid-state batteries.

[0031] Based on the aforementioned embodiments, the functional component 150 includes a gas absorbent and / or a desiccant. This functional component 150 can efficiently adsorb and lock in trace amounts of moisture remaining during battery manufacturing, or harmful gases (such as oxygen) generated by side reactions during long-term cycling, thereby significantly reducing the moisture content and gas partial pressure within the battery environment. This not only effectively prevents moisture from chemically corroding and decomposing highly active electrode materials (such as nickel-rich cathodes) and water-sensitive solid electrolytes (especially sulfide electrolytes), ensuring the structural stability and ionic conductivity of key materials, but also fundamentally suppresses interfacial contact degradation and internal pressure increases caused by gas accumulation. Ultimately, this innovative design synergistically improves the coulombic efficiency, cycle life, and safety and reliability of solid-state batteries during long-term use.

[0032] As an illustrative example and not a limitation on the scope of protection, functional component 150 is a hindered phenolic antioxidant. It is understood that the antioxidant in this application is merely an illustrative method for treating harmful gases generated during battery use or for inhibiting gas generation. Without departing from the inventive concept of this application, any known gas treatment or generation inhibition method that can be used for batteries can be used in this application.

[0033] Based on the foregoing embodiments, the insulating member 160 is made of one or more combinations of rubber, polyester, and substituted or unsubstituted polyolefins. In some specific embodiments, the rubber includes one or more combinations of styrene-butadiene rubber, nitrile rubber, chloroprene rubber, ethylene propylene rubber, silicone rubber, and fluororubber. In some specific embodiments, the polyester includes one or more combinations of polyethylene terephthalate, polybutylene terephthalate, and polyarylates. In some specific embodiments, the substituted or unsubstituted polyolefins include one or more combinations of polyethylene, polytetrafluoroethylene, polypropylene, and polyvinyl chloride. These materials not only possess excellent electrical insulation properties, fundamentally ensuring the short-circuit safety of the battery, but also share good flexibility, elastic deformation capability, and adjustable mechanical strength. This allows the insulating components made from them to effectively adapt to the high-pressure environment in isostatic pressing processes and the volume changes of electrode materials during battery charge-discharge cycles, buffering stress and preventing self-rupture or damage to the electrodes. In addition, these polymer materials generally have excellent chemical stability, able to withstand the complex electrochemical environment inside the battery, avoiding deterioration reactions such as swelling and decomposition. This ensures the long-term reliability and durability of the insulating components, providing a key material basis for improving the overall performance and lifespan of solid-state batteries.

[0034] It should be noted that, in the solid-state lithium-ion battery cell unit of the present invention, the positional relationship between the functional components and the insulating components is not limited to the above-described embodiments, and the two can also be in the following other positional relationships.

[0035] Please see Figure 2 The solid-state lithium-ion battery cell unit 200 of the second embodiment of the present invention includes a positive electrode 210, a solid electrolyte membrane 220, and a negative electrode 230 stacked sequentially. The specific structures of the positive electrode 210, the solid electrolyte membrane 220, and the negative electrode 230 are not limited and are determined according to actual conditions.

[0036] In the solid-state lithium-ion battery cell unit 200 of this embodiment, the orthogonal projections of the positive electrode 210 onto the negative electrode 230 and the solid electrolyte membrane 220 are completely located within the range of the negative electrode 230 and the solid electrolyte membrane 220, thereby forming an annular overhang region 240 in the circumferential direction of the negative electrode 230 and the solid electrolyte membrane 220; a functional component 250 and an insulating component 260 are provided in the overhang region 240. The functional component 250 can be configured as a functional material that optimizes the internal environment of the battery, ensuring the smooth discharge of gas during the pressing process.

[0037] Furthermore, the orthographic projection of the functional component 250 onto the solid electrolyte membrane 220 is annular, and the orthographic projection of the insulating component 260 onto the solid electrolyte membrane 220 is also annular. The functional component 250 and the insulating component 260 are located in the same horizontal plane. Specifically, in this embodiment, the functional component 250 is located on the side of the insulating component 260 away from the positive electrode plate 210.

[0038] Please see Figure 3 The solid-state lithium-ion battery cell unit 300 of the third embodiment of the present invention includes a positive electrode 310, a solid electrolyte membrane 320, and a negative electrode 330 stacked sequentially. The specific structures of the positive electrode 310, the solid electrolyte membrane 320, and the negative electrode 330 are not limited and are determined according to actual conditions.

[0039] In the solid-state lithium-ion battery cell unit 300 of this embodiment, the orthogonal projections of the positive electrode 310 onto the negative electrode 330 and the solid electrolyte membrane 320 are completely located within the range of the negative electrode 330 and the solid electrolyte membrane 320, thereby forming an annular overhang region 340 in the circumferential direction of the negative electrode 330 and the solid electrolyte membrane 320; a functional component 350 and an insulating component 360 are provided in the overhang region 340. The functional component 350 can be configured as a functional material that optimizes the internal environment of the battery, ensuring the smooth discharge of gas during the pressing process.

[0040] Furthermore, the orthographic projection of the functional component 350 onto the solid electrolyte membrane 320 is annular, and the orthographic projection of the insulating component 360 onto the solid electrolyte membrane 320 is also annular. The functional component 350 and the insulating component 360 are distributed along the thickness direction of the solid electrolyte membrane 320, and the ratio of the projected area of ​​the functional component 350 and the insulating component 360 onto the solid electrolyte membrane 320 is 0.97 to 1.03. Specifically, in this embodiment, the functional component 350 is located on the side of the insulating component 360 away from the negative electrode plate 330.

[0041] Please see Figure 4 The solid-state lithium-ion battery cell unit 400 of the fourth embodiment of the present invention includes a positive electrode 410, a solid electrolyte membrane 420, and a negative electrode 430 stacked sequentially. The specific structures of the positive electrode 410, the solid electrolyte membrane 420, and the negative electrode 430 are not limited and are determined according to actual conditions.

[0042] In the solid-state lithium-ion battery cell unit 400 of this embodiment, the orthogonal projections of the positive electrode 410 onto the negative electrode 430 and the solid electrolyte membrane 420 are completely located within the range of the negative electrode 430 and the solid electrolyte membrane 420, thereby forming an annular overhang region 440 in the circumferential direction of the negative electrode 430 and the solid electrolyte membrane 420; a functional component 450 and an insulating component 460 are provided in the overhang region 440. The functional component 450 can be configured as a functional material that optimizes the internal environment of the battery, ensuring the smooth discharge of gas during the pressing process.

[0043] Furthermore, the orthographic projection of the functional component 450 onto the solid electrolyte membrane 420 is annular, and the orthographic projection of the insulating component 460 onto the solid electrolyte membrane 420 is also annular. The functional component 450 and the insulating component 460 are distributed along the thickness direction of the solid electrolyte membrane 420, and the ratio of the projected area of ​​the functional component 450 and the insulating component 460 onto the solid electrolyte membrane 420 is 0.97 to 1.03. Specifically, in this embodiment, the functional component 450 is located on the side of the insulating component 460 closer to the negative electrode plate 430.

[0044] The solid-state lithium-ion battery cell of this invention forms an overhang region by completely surrounding the positive electrode with the negative electrode. Functional components and insulating members are then placed within this region. This structural design ensures high battery safety while providing sufficient mechanical support to the overhang region through the insulating members, preventing deformation or misalignment of the electrode during isostatic pressing, thus significantly improving cell production yield. Furthermore, the functional components can be configured with functional substances that optimize the internal environment of the battery, ensuring smooth gas discharge during pressing, thereby jointly guaranteeing the long-term cycle stability and reliability of the solid-state lithium-ion battery.

[0045] Please see Figure 5 The solid-state lithium-ion battery cell assembly 500 of one embodiment of the present invention includes a plurality of solid-state lithium-ion battery cell units stacked together as described above. Taking solid-state lithium-ion battery cell unit 100 as an example, a solid electrolyte membrane 510 is disposed between two adjacent solid-state lithium-ion battery cell units 100.

[0046] The solid-state lithium-ion battery cell unit 100 includes a positive electrode 110, a solid electrolyte membrane 120, and a negative electrode 130 stacked sequentially. In the solid-state lithium-ion battery cell unit 100, the orthogonal projection of the positive electrode 110 onto the negative electrode 130 is completely within the range of the negative electrode 130, forming an annular overhang region 140 in the circumference of the negative electrode 130. A functional component 150 and an insulating component 160 are provided in the overhang region 140, with the insulating component 160 located on the side of the functional component 150 away from the positive electrode 110.

[0047] The solid-state lithium-ion battery cell assembly of this invention includes several stacked solid-state lithium-ion battery cell units. By completely surrounding the negative electrode with the positive electrode to form an overhang region, and setting functional components and insulating components in this region, the battery achieves high safety while the insulating components provide sufficient mechanical support strength for the overhang region, preventing deformation or misalignment of the electrode during isostatic pressing, thereby greatly improving the cell production yield. In addition, the functional components can be set as functional materials that optimize the internal environment of the battery, ensuring the smooth discharge of gas during pressing, jointly guaranteeing the long-term cycle stability and reliability of the solid-state lithium-ion battery.

[0048] A solid-state lithium-ion battery according to one embodiment of the present invention includes the above-described solid-state lithium-ion battery cell assembly.

[0049] The solid-state lithium-ion battery of this invention includes the aforementioned solid-state lithium-ion battery cell assembly. By completely surrounding the negative electrode with the positive electrode to form an overhang region, and setting functional components and insulating components in this region, the battery achieves high safety while the insulating components provide sufficient mechanical support strength for the overhang region, preventing deformation or misalignment of the electrode during isostatic pressing, thereby greatly improving the cell production yield. In addition, the functional components can be set as functional materials that optimize the internal environment of the battery, ensuring the smooth discharge of gas during the pressing process, jointly guaranteeing the long-term cycle stability and reliability of the solid-state lithium-ion battery.

[0050] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A solid-state lithium-ion battery cell unit, characterized in that, The solid-state lithium-ion battery cell unit includes a positive electrode, a solid electrolyte membrane, and a negative electrode stacked in sequence. The positive electrode sheet's orthogonal projection onto the negative electrode sheet and the solid electrolyte membrane is completely located within the range of the negative electrode sheet and the solid electrolyte membrane, thereby forming an annular overhang region in the circumference of the negative electrode sheet and the solid electrolyte membrane; functional components and insulating components are provided in the overhang region.

2. The solid-state lithium-ion battery cell unit according to claim 1, characterized in that, The area ratio of the negative electrode sheet to the solid electrolyte membrane is 0.97~1.

03.

3. The solid-state lithium-ion battery cell unit according to claim 1, characterized in that, The functional component and the insulating component are both located in the same horizontal plane. The orthographic projection of the functional component onto the solid electrolyte membrane is ring-shaped.

4. The solid-state lithium-ion battery cell unit according to claim 3, characterized in that, The outer edge of the insulating member coincides with the outer edge of the solid electrolyte membrane and / or the negative electrode sheet; and / or The functional component is located on the side of the insulating member closer to the positive electrode plate or on the side of the insulating member farther away from the positive electrode plate.

5. The solid-state lithium-ion battery cell unit according to claim 3, characterized in that, The offset between any two of the geometric centers of the positive electrode, the solid electrolyte membrane, and the negative electrode is less than 3%.

6. The solid-state lithium-ion battery cell unit according to any one of claims 1, 3, and 5, characterized in that, The functional components include gas absorbents and / or desiccants.

7. The solid-state lithium-ion battery cell unit according to claim 1, characterized in that, The functional component and the insulating component are both annular in shape when projected onto the solid electrolyte membrane. The functional component and the insulating component are distributed along the thickness direction of the solid electrolyte membrane. The ratio of the projected area of ​​the functional component and the insulating component on the solid electrolyte membrane is 0.97 to 1.

03.

8. The solid-state lithium-ion battery cell unit according to claim 1, characterized in that, The insulating component is made of one or more of rubber, polyester, and substituted or unsubstituted polyolefins. The rubber includes one or more of styrene-butadiene rubber, nitrile rubber, chloroprene rubber, ethylene propylene rubber, silicone rubber, and fluororubber; The polyester includes one or more combinations of polyethylene terephthalate, polybutylene terephthalate and polyarylate; The substituted or unsubstituted polyolefins include one or more combinations of polyethylene, polytetrafluoroethylene, polypropylene, and polyvinyl chloride.

9. A solid-state lithium-ion battery cell assembly, characterized in that, The battery comprises several solid-state lithium-ion battery cell units as described in any one of claims 1 to 8, wherein a solid electrolyte membrane is disposed between two adjacent solid-state lithium-ion battery cell units.

10. A solid-state lithium-ion battery, characterized in that, Includes the solid-state lithium-ion battery cell assembly as described in claim 9.

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