A solid-state battery

Abstract

This invention provides a solid-state battery, comprising: a battery casing; a through-hole forming within the battery casing; a positive electrode, a solid electrolyte membrane, and a negative electrode disposed within the through-hole; the positive electrode, solid electrolyte membrane, and negative electrode sequentially contacting each other to form a three-layer structure; a positive threaded section at the positive end of the through-hole, threaded with a positive bolt; and a negative threaded section at the negative end of the through-hole, threaded with a negative bolt; the positive bolt and negative bolt cooperate to clamp the three-layer structure. The positive and negative bolts press the positive electrode, solid electrolyte membrane, and negative electrode together. Precise pressure control of the positive and negative bolts using a torque wrench ensures tight contact between the positive electrode, solid electrolyte membrane, and negative electrode, reducing the high interfacial impedance of the solid-state battery.

Description

Technical Field

[0001] This utility model belongs to the field of solid-state batteries, and more specifically, relates to a solid-state battery. Background Technology

[0002] Currently, lithium-ion battery technology is developing rapidly, with lithium iron phosphate and nickel-cobalt-manganese ternary lithium batteries dominating the new energy vehicle power battery market. However, because current lithium batteries are liquid lithium batteries, they contain approximately 20% by weight of flammable and explosive liquid organic electrolyte. During charging and discharging, liquid lithium-ion batteries inevitably experience side reactions, causing volume expansion. Furthermore, the presence of liquid electrolyte makes them prone to leakage, and their flammability poses safety risks. This inherent safety hazard severely restricts the market expansion of new energy vehicle power batteries.

[0003] Solid-state batteries are a new generation of lithium-ion batteries that use solid electrolytes instead of liquid electrolytes. Solid electrolytes have good thermal stability, are non-flammable, and have fewer interfacial side reactions during charging and discharging, which can suppress the growth of lithium dendrites and achieve intrinsic safety. Due to the intrinsic safety characteristics of solid electrolytes, higher capacity positive and negative electrode materials can be matched, such as 9-series nickel-cobalt-manganese ternary positive electrodes and silicon-carbon negative electrodes, achieving a leap in energy density, reaching up to 500Wh / kg or more, which is twice the energy density of current liquid batteries. In other words, for the same weight of battery in a car, solid-state batteries can double the driving range compared to ternary batteries.

[0004] While solid-state batteries possess significant technological advantages, several key technical challenges remain to be overcome. One critical issue is the interface. In solid-state batteries, the interface between the electrodes and the electrolyte is a solid-solid contact. Due to the lack of wettability of the solid phase, the contact area is small, resulting in interfacial voids and high interfacial impedance. This hinders lithium-ion transport between the positive and negative electrodes, impacting the cell's fast-charging and low-temperature performance. Utility Model Content

[0005] The purpose of this invention is to provide a solid-state battery that solves the problem of high interface impedance in solid-state batteries.

[0006] To achieve the above objectives, this utility model provides a solid-state battery, comprising: a battery casing, wherein a through hole is formed in the battery casing, a positive electrode plate, a solid electrolyte membrane, and a negative electrode plate are disposed in the through hole, the positive electrode plate, the solid electrolyte membrane, and the negative electrode plate are sequentially contacted to form a three-layer structure, a positive electrode threaded section is provided at the positive end of the through hole, and a positive electrode bolt is threadedly connected to the positive electrode threaded section, and a negative electrode threaded section is provided at the negative end of the through hole, and a negative electrode bolt is threadedly connected to the negative electrode threaded section, the positive electrode bolt and the negative electrode bolt cooperating to clamp the three-layer structure.

[0007] Optionally, the solid-state battery also includes:

[0008] An observation hole is provided inside the battery casing. One end of the observation hole communicates with the through hole, and the other end of the observation hole communicates with the outside of the battery casing. The position of the observation hole corresponds to the three-layer structure.

[0009] A plug that matches the observation hole.

[0010] Optionally, the plug is threaded to the observation hole.

[0011] Optionally, the battery housing is cylindrical, the through hole is arranged along the axial direction of the battery housing, and the observation hole is arranged along the radial direction of the battery housing.

[0012] Optionally, the battery casing is made of insulating ceramic.

[0013] Optionally, the battery casing is made of feldspar ceramic, silica ceramic, alumina ceramic, magnesium ceramic, alumina ceramic, or mullite ceramic.

[0014] Optionally, the plug is made of insulating ceramic.

[0015] Optionally, the plug may be made of feldspar ceramic, silica ceramic, alumina ceramic, magnesia ceramic, alumina ceramic, or mullite ceramic.

[0016] Optionally, the battery casing has a length of 85mm-130mm and a diameter of 45mm-105mm.

[0017] The diameter of the through hole is 10mm-25mm;

[0018] The inner diameter of the positive electrode threaded section is 3mm-7mm, and the length of the positive electrode threaded section is 22mm-52mm;

[0019] The inner diameter of the negative electrode threaded section is 3mm-7mm, and the length of the negative electrode threaded section is 22mm-52mm.

[0020] Optionally, the diameter of the observation hole is 4mm-8mm, the diameter of the threaded area of ​​the plug is 3mm-7mm, and the length is 22mm-52mm.

[0021] The beneficial effects of this utility model are as follows: It provides a solid-state battery, including: a battery casing, with a through hole forming inside the battery casing. A positive electrode, a solid electrolyte membrane, and a negative electrode are disposed within the through hole. The positive electrode, solid electrolyte membrane, and negative electrode are sequentially contacted to form a three-layer structure. A positive threaded section is provided at the positive end of the through hole, and a positive bolt is threadedly connected to the positive threaded section. A negative threaded section is provided at the negative end of the through hole, and a negative bolt is threadedly connected to the negative threaded section. The positive bolt and negative bolt cooperate to clamp the three-layer structure. The positive and negative bolts press the positive electrode, solid electrolyte membrane, and negative electrode together. Precise pressure control of the positive and negative bolts can be achieved using a torque wrench, ensuring tight contact between the positive electrode, solid electrolyte membrane, and negative electrode, thus reducing the problem of high interfacial impedance in solid-state batteries.

[0022] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0023] The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings, in which like reference numerals generally represent like parts.

[0024] Figure 1 One of the schematic structural diagrams of a solid-state battery according to an embodiment of the utility model is shown.

[0025] Figure 2 The second schematic structural diagram of a solid-state battery according to an embodiment of the utility model is shown.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Battery casing; 2. Through hole; 3. Positive electrode; 4. Solid electrolyte membrane; 5. Negative electrode; 6. Positive bolt; 7. Negative bolt; 8. Observation hole; 9. Hole plug. Detailed Implementation

[0028] Preferred embodiments of the present invention will now be described in more detail. While preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0029] Example

[0030] like Figure 1 and 2As shown, this embodiment provides a solid-state battery, including: a battery housing 1, a through hole 2 formed in the battery housing 1, a positive electrode 3, a solid electrolyte membrane 4 and a negative electrode 5 disposed in the through hole 2, the positive electrode 3, the solid electrolyte membrane 4 and the negative electrode 5 being in sequential contact to form a three-layer structure, a positive electrode threaded section is provided at the positive end of the through hole 2, a positive electrode bolt 6 is threadedly connected to the positive electrode threaded section, a negative electrode threaded section is provided at the negative end of the through hole 2, a negative electrode bolt 7 is threadedly connected to the negative electrode threaded section, and the positive electrode bolt 6 and the negative electrode bolt 7 are engaged to clamp the three-layer structure.

[0031] Specifically, the positive electrode bolt 6 and the negative electrode bolt 7 press the positive electrode 3, the solid electrolyte membrane 4, and the negative electrode 5 together. Precise pressure control of the positive electrode bolt 6 and the negative electrode bolt 7 using a torque wrench ensures tight contact between the positive electrode 3 and the solid electrolyte membrane 4 and the negative electrode 5, reducing the high interfacial impedance of solid-state batteries. Furthermore, this battery can also be used for performance evaluation, technical verification, and functional testing of liquid lithium-ion batteries, sodium-ion batteries, potassium-ion batteries, lithium metal batteries, and other electrochemical energy storage devices with basic battery structures.

[0032] Optionally, the solid-state battery also includes:

[0033] Observation hole 8 is located inside the battery housing 1. One end of the observation hole 8 is connected to the through hole 2, and the other end of the observation hole 8 is connected to the outside of the battery housing 1. The position of the observation hole 8 corresponds to the three-layer structure.

[0034] Plug 9 is fitted to observation hole 8. In this embodiment, plug 9 is threadedly connected to observation hole 8.

[0035] Specifically, observation hole 8 is used to observe the alignment of the three-layer structure inside through hole 2, as well as the interface contact, and to replenish interface wetting agent as needed. In liquid or semi-solid systems, observation hole 8 can be used to inject electrolyte.

[0036] Optionally, the battery housing 1 is cylindrical, the through hole 2 is arranged along the axial direction of the battery housing 1, and the observation hole 8 is arranged along the radial direction of the battery housing 1.

[0037] The battery casing 1 is made of insulating ceramic.

[0038] Furthermore, the battery casing 1 is made of feldspar ceramic, silica ceramic, aluminum ceramic, magnesium ceramic, alumina ceramic, or mullite ceramic. The positive electrode bolt 6 is made of metallic aluminum. The negative electrode bolt 7 can be made of metallic copper, metallic nickel, or nickel-plated copper, etc.

[0039] Optionally, the plug 9 may be made of insulating ceramic.

[0040] Furthermore, the material of the plug 9 is feldspar ceramic, silica ceramic, alumina ceramic, magnesium ceramic, alumina ceramic, or mullite ceramic.

[0041] In this embodiment, the length of the battery casing 1 is 85mm-130mm, and the diameter of the battery casing 1 is 45mm-105mm;

[0042] The diameter of through hole 2 is 10mm-25mm;

[0043] The inner diameter of the positive electrode threaded section is 3mm-7mm, and the length of the positive electrode threaded section is 22mm-52mm;

[0044] The inner diameter of the negative thread section is 3mm-7mm, and the length of the negative thread section is 22mm-52mm.

[0045] The diameter of observation hole 8 is 4mm-8mm, and the diameter of the threaded area of ​​hole plug 9 is 3mm-7mm, with a length of 22mm-52mm.

[0046] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A solid-state battery, characterized in that, include: A battery casing (1) has a through hole (2) that penetrates the battery casing (1). A positive electrode plate (3), a solid electrolyte membrane (4), and a negative electrode plate (5) are provided in the through hole (2). The positive electrode plate (3), the solid electrolyte membrane (4), and the negative electrode plate (5) are in contact with each other to form a three-layer structure. A positive electrode threaded section is provided at the positive end of the through hole (2), and a positive electrode bolt (6) is threadedly connected to the positive electrode threaded section. A negative electrode threaded section is provided at the negative end of the through hole (2), and a negative electrode bolt (7) is threadedly connected to the negative electrode threaded section. The positive electrode bolt (6) and the negative electrode bolt (7) cooperate to clamp the three-layer structure.

2. The solid-state battery according to claim 1, characterized in that, Also includes: An observation hole (8) is provided inside the battery housing (1). One end of the observation hole (8) is connected to the through hole (2), and the other end of the observation hole (8) is connected to the outside of the battery housing (1). The position of the observation hole (8) corresponds to the three-layer structure. A plug (9) is provided, which is matched with the observation hole (8).

3. The solid-state battery according to claim 2, characterized in that, The plug (9) is threadedly connected to the observation hole (8).

4. The solid-state battery according to claim 2, characterized in that, The battery housing (1) is cylindrical, the through hole (2) is arranged along the axial direction of the battery housing (1), and the observation hole (8) is arranged along the radial direction of the battery housing (1).

5. The solid-state battery according to claim 1, characterized in that, The battery casing (1) is made of insulating ceramic.

6. The solid-state battery according to claim 5, characterized in that, The battery casing (1) is made of feldspar ceramic, silica ceramic, alumina ceramic, magnesium ceramic, alumina ceramic or mullite ceramic.

7. The solid-state battery according to claim 2, characterized in that, The plug (9) is made of insulating ceramic.

8. The solid-state battery according to claim 7, characterized in that, The plug (9) is made of feldspar ceramic, silica ceramic, alumina ceramic, magnesium ceramic, alumina ceramic or mullite ceramic.

9. The solid-state battery according to claim 4, characterized in that, The battery casing (1) has a length of 85mm-130mm and a diameter of 45mm-105mm; The diameter of the through hole (2) is 10mm-25mm; The inner diameter of the positive electrode threaded section is 3mm-7mm, and the length of the positive electrode threaded section is 22mm-52mm; The inner diameter of the negative electrode threaded section is 3mm-7mm, and the length of the negative electrode threaded section is 22mm-52mm.

10. The solid-state battery according to claim 3, characterized in that, The diameter of the observation hole (8) is 4mm-8mm, and the diameter of the threaded area of ​​the plug (9) is 3mm-7mm, and the length is 22mm-52mm.

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