A solid-state battery with a gel-phase lithium metal anode

Abstract

This invention discloses a solid-state battery with a gel-phase lithium metal anode, belonging to the field of solid-state battery technology. It includes a positive electrode plate and a current collector. A gel-phase lithium metal anode sheet is disposed on one side of the current collector, and a separator is disposed on the side of the gel-phase lithium metal anode sheet away from the current collector. A frame-shaped adjustment assembly is also fixed on one side of the current collector. The gel-phase lithium metal anode sheet is inserted into the adjustment assembly. The side of the adjustment assembly away from the current collector is fixedly connected to the sidewall of the positive electrode plate. A positive tab is fixed on the top surface of the positive electrode plate, and a negative tab is fixed on the top surface of the current collector. The battery body is composed of a positive electrode plate, a solid electrolyte, a separator, a gel-phase lithium metal anode sheet, and a current collector arranged in sequence. The positive and negative tabs enable circuit conduction. The frame-shaped adjustment assembly integrates the gel-phase lithium metal anode sheet and the solid electrolyte. Before cold starting, the solid electrolyte can be directionally heated using the internal heating element built into the adjustment assembly.

Description

Technical Field

[0001] This invention relates to the field of solid-state battery technology, and more specifically, to a solid-state battery with a gel-phase lithium metal anode. Background Technology

[0002] Solid-state batteries use solid electrolytes instead of traditional liquid organic electrolytes, possessing core advantages such as high breakdown voltage, no electrolyte leakage, strong flame retardant safety, and high energy density. They are the core energy storage devices for next-generation new energy storage, vehicle power, and portable electronic devices. Lithium metal possesses extremely high theoretical specific capacity and extremely low electrode potential, making it the optimal anode material for improving the energy density of solid-state batteries. Compared to traditional lithium foil solid-state anodes, gel-phase lithium metal anodes combine the structural stability of solid-state lithium with liquid-like ion conduction characteristics. This effectively reduces electrode interface resistance, suppresses electrode side reactions and passivation layer growth, improves lithium-ion conduction efficiency, and significantly optimizes the electrochemical cycle performance of solid-state batteries. It has become the mainstream modification and research direction for high-performance solid-state battery anodes, adapting to complex energy storage operating conditions such as low temperature, high power, and long cycle time.

[0003] Existing solid-state batteries mainly adopt a layer-by-layer stacked encapsulation structure consisting of a positive electrode plate, a solid electrolyte, a separator, a gel-phase lithium anode, and a current collector. The interlayer ion conduction is achieved by stacking and bonding, and the functional layers are fixed by the external encapsulation shell. The pre-tightening pressure ensures that the separator, solid electrolyte, and gel-phase lithium anode are in close contact. The material properties of the gel-phase lithium itself reduce interfacial side reactions, thereby ensuring the basic charge and discharge performance of the solid-state battery and meeting the energy storage and power supply requirements under normal temperature conditions. However, in cold and low-temperature conditions, the conductivity of the solid electrolyte in existing solid-state batteries using gel-phase lithium anodes will decrease significantly. The main reason is that after being placed in a cold environment for a period of time, the solid electrolyte and gel-phase lithium anode in the battery are prone to shrinkage at low temperatures, which can easily lead to gaps between the layers after the shrinkage. This results in poor interface contact, increased interface impedance, and poor battery power supply stability. Consequently, the conductivity of the existing solid-state batteries decreases after cold start, and the start-up efficiency of the solid-state batteries is greatly reduced.

[0004] In view of this, the present invention proposes a solid-state battery with a gel-phase lithium metal anode that can be used efficiently and stably. Summary of the Invention

[0005] Technical problem to be solved: The purpose of this invention is to provide a solid-state battery with a gel-phase lithium metal anode, which solves the technical problems mentioned in the background art.

[0006] Technical Solution: The present invention provides a solid-state battery with a gel-phase lithium metal anode, comprising a positive electrode plate and a current collector. A gel-phase lithium metal anode sheet is disposed on one side of the current collector, and a separator is disposed on the side of the gel-phase lithium metal anode sheet away from the current collector. A frame-shaped measurement and adjustment assembly is also fixed on one side of the current collector. The gel-phase lithium metal anode sheet is inserted into the measurement and adjustment assembly. The side of the measurement and adjustment assembly away from the current collector is fixedly connected to the side wall of the positive electrode plate. A positive electrode tab is fixed on the top surface of the positive electrode plate, and a negative electrode tab is fixed on the top surface of the current collector. A solid electrolyte is disposed on the side wall of the positive electrode plate and is inserted into the measurement and adjustment assembly. The separator is attached to the solid electrolyte on one side. The measurement and adjustment assembly includes a rubber frame, which is fixed to the side wall of the current collector. A fixing frame is inserted inside the rubber frame. An internal heating component and an internal expansion component are disposed inside the fixing frame. The internal heating component is attached to the outer wall of the solid electrolyte to heat the solid electrolyte. The internal expansion component is attached to the outer wall of the gel phase lithium metal anode sheet. The internal expansion component expands thermally to gather the gel phase lithium metal anode sheet so that the separator is tightly attached between the gel phase lithium metal anode sheet and the solid electrolyte.

[0007] Furthermore, a wire is connected to the top surface of the fixed frame, and a sealing block is sleeved on the outer wall of the wire. A slot is opened on one side of the top surface of the frame, and the sealing block is inserted into the slot. The wire is electrically connected to the internal heating component and the internal expansion component respectively.

[0008] Furthermore, the internal heating component includes an outer electrode ring, which is embedded and fixed inside the fixed frame. An inner electrode ring is disposed inside the outer electrode ring. A first insulating film is sleeved on the outer wall of the inner electrode ring and adheres to the inner wall of the outer electrode ring. A second insulating film is adhered to the inner wall of the inner electrode ring and adheres to the outer wall of the solid electrolyte. Both the outer electrode ring and the inner electrode ring are electrically connected to wires. The outer electrode ring is electrically connected to an external high-frequency pulse output terminal through a wire, and the inner electrode ring is electrically connected to the ground terminal of an external high-frequency pulse power supply through a wire.

[0009] Furthermore, the inner electrode ring has an annular tubular structure.

[0010] Furthermore, the annular tube structure of the inner electrode ring is filled with insulating oil.

[0011] Furthermore, the inner expansion component includes an electric heating ring, which is embedded and fixed inside the fixed frame. A thermal expansion ring is attached and fixed inside the electric heating ring, and the thermal expansion ring is sleeved on the outer wall of the gel phase lithium metal negative electrode sheet. The electric heating ring is electrically connected to the wire.

[0012] Furthermore, an inner baffle is fixed to the inner wall of the fixed frame near the current collector, and the thermal expansion ring is attached to the inner wall of the inner baffle.

[0013] Furthermore, the measurement and adjustment assembly also includes an integrated temperature and pressure sensor, which is fixed to the inner wall of the fixed frame and is attached between the side wall of the solid electrolyte and the side wall of the diaphragm. The integrated temperature and pressure sensor is electrically connected to the wire.

[0014] Furthermore, the diaphragm has a convex shape, and the integrated temperature and pressure sensor has a square frame structure, with the convex side of the diaphragm inserted into the frame structure of the integrated temperature and pressure sensor.

[0015] Furthermore, the integrated temperature and pressure sensor is provided with two annular detection areas. The side closer to the fixed frame is the outer detection area, and the side farther from the fixed frame is the inner detection area. The outer detection area is attached between the inner electrode ring and the thermal expansion ring, and the inner detection area is attached between the solid electrolyte and the diaphragm. The inner wall of the fixed frame is flush with the inner wall of the thermal expansion ring and the inner wall of the second insulating membrane.

[0016] Beneficial effects: One or more technical solutions provided in this invention have at least the following technical effects or advantages: 1. The battery body consists of a positive electrode plate, a solid electrolyte, a separator, a gel-phase lithium metal negative electrode sheet, and a current collector arranged in sequence. It is equipped with positive and negative tabs to achieve circuit conduction. A frame-shaped test and adjustment assembly is set up to integrate the gel-phase lithium metal negative electrode sheet and the solid electrolyte. Before the cold start of this solid-state battery, the solid electrolyte can be directionally heated by the internal heating component built into the test and adjustment assembly to improve the low-temperature conductivity of the battery. After the solid electrolyte expands due to heat, it reduces the interlayer gap and avoids the problems of poor contact and increased interface impedance caused by low-temperature contraction.

[0017] 2. The gel-phase lithium metal anode used is a gel polymer mixed with lithium particles, which significantly reduces the direct contact area between highly active lithium metal and the solid electrolyte. This weakens spontaneous side reactions from the source. Compared with traditional lithium metal anodes, it not only reduces side reactions and passivation layer formation and improves lithium-ion conduction efficiency, but also, because the specific heat capacity of the gel-phase lithium metal anode is lower than that of traditional lithium metal anodes, it can avoid absorbing more heat from the solid electrolyte when the solid electrolyte is heated, thereby ensuring the heating efficiency of the solid electrolyte. This allows the battery to be quickly activated at low temperatures and improves the thermal utilization rate of the solid electrolyte's self-heating.

[0018] 3. The internal expansion component built into the measurement and adjustment component expands when heated and squeezes and gathers the gel phase lithium metal anode sheet, causing the gel phase lithium metal anode sheet to push the separator to compact, eliminating interlayer gaps, and allowing the separator to be tightly sandwiched between the anode sheet and the solid electrolyte. This addresses the problem of increased gaps caused by the shrinkage of the multilayer structure under low temperature conditions, and further ensures tight contact and stable interface impedance of each functional layer.

[0019] 4. A heating electrode group is formed by inner and outer nested outer electrode rings and inner electrode rings, which are respectively connected to the high-frequency pulse output terminal and the ground terminal. After being energized, an alternating magnetic field is formed. By utilizing the capacitance effect and charge transport characteristics of the solid electrolyte itself, rapid self-heating is achieved, which not only ensures heating efficiency, but also avoids the generation of side reactions caused by interventional heating, thus ensuring heating stability.

[0020] 5. The inner electrode ring tube is filled with insulating oil. The flow and convection of the insulating oil quickly equalizes the temperature of the entire electrode ring, significantly reducing the circumferential temperature difference. At the same time, the insulating oil has good heat absorption capacity, which can absorb excess heat when the temperature is overheated for a short time, slowing down the rate of temperature rise. Together with the temperature control system, it avoids the risk of high temperature damage and maintains stable interface impedance.

[0021] 6. The inner expansion component is composed of an electric heating ring and a thermal expansion ring. When the electric heating ring is energized, it generates heat, which is transferred to the outer thermal expansion ring. The thermal expansion ring is fitted around the outside of the gel phase lithium metal anode sheet. When heated, it expands radially, forming a gathering and squeezing effect on the gel phase lithium metal anode sheet. This pushes the gel phase lithium metal anode sheet and the separator together to adhere to the solid electrolyte side, actively eliminating interlayer gaps and enhancing the interface contact effect.

[0022] 7. A temperature and pressure integrated sensor is installed on the inner wall of the fixed frame. The probe is attached to the junction of the solid electrolyte and the diaphragm. It can simultaneously collect two types of data, namely interface temperature and contact pressure, in real time. The temperature and pressure integrated sensor transmits the detection signal to the main controller through wires, providing data basis for high-frequency pulse heating, thermal expansion and extrusion and other control actions, so as to realize closed-loop precise control. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a solid-state battery structure with a gel-phase lithium metal anode according to the present invention.

[0024] Figure 2 This is an exploded view of the overall structure of the present invention.

[0025] Figure 3 This is an exploded view of the measurement and adjustment component structure of the present invention.

[0026] Figure 4 This is a schematic diagram of the positive electrode plate structure of the present invention.

[0027] Figure 5 This is a schematic diagram of the gel-phase lithium metal anode structure of the present invention.

[0028] Figure 6 This is a schematic diagram of the fixed frame structure of the present invention.

[0029] Figure 7 for Figure 3 A magnified schematic diagram of the structure at point A in the middle.

[0030] Figure 8 This is a cross-sectional view of the integrated temperature and pressure sensor of the present invention in its bonded state with the diaphragm and solid electrolyte.

[0031] Figure 9 This is a cross-sectional view of the integrated temperature and pressure sensor of the present invention in a state where one side is separated from the solid electrolyte.

[0032] Figure 10 This is a cross-sectional view of the structure of the integrated temperature and pressure sensor of the invention, in a state where the solid electrolyte and diaphragm are separated on both sides.

[0033] Explanation of the numbers in the diagram: 100, positive electrode plate; 110, positive electrode tab; 200, current collector; 210, negative electrode tab; 300, measurement and adjustment assembly; 310, plastic frame; 311, slot; 312, inner baffle frame; 320, fixing frame; 321, sealing block; 322, wire; 330, inner electrode ring; 340, thermal expansion ring; 350, outer electrode ring; 360, electric heating ring; 370, integrated temperature and pressure sensor; 380, first insulating film; 390, second insulating film; 400, solid electrolyte; 500, gel phase lithium metal negative electrode sheet; 600, separator. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a link; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] Reference Figures 1-10 This invention provides a solid-state battery with a gel-phase lithium metal anode, including a positive electrode plate 100 and a current collector 200. A gel-phase lithium metal anode sheet 500 is disposed on one side of the current collector 200, and a separator 600 is disposed on the side of the gel-phase lithium metal anode sheet 500 away from the current collector 200. A frame-shaped measurement and adjustment assembly 300 is also fixed on one side of the current collector 200. The gel-phase lithium metal anode sheet 500 is inserted into the measurement and adjustment assembly 300. The side of the measurement and adjustment assembly 300 away from the current collector 200 is fixedly connected to the side wall of the positive electrode plate 100. A positive electrode tab 110 is fixed on the top surface of the positive electrode plate 100, and a negative electrode tab 210 is fixed on the top surface of the current collector 200. A solid electrolyte 400 is disposed on the side wall of the positive electrode plate 100 and is inserted into the measurement and adjustment assembly 300. One side of the separator 600 is attached to the solid electrolyte 400. The measurement and adjustment component 300 includes a frame 310, which is fixed to the side wall of the current collector 200. A fixing frame 320 is inserted inside the frame 310. An internal heating component and an internal expansion component are provided inside the fixing frame 320. The internal heating component is attached to the outer wall of the solid electrolyte 400 to heat the solid electrolyte 400. The internal expansion component is attached to the outer wall of the gel phase lithium metal anode sheet 500. The internal expansion component expands thermally to gather the gel phase lithium metal anode sheet 500 so that the separator 600 is tightly attached between the gel phase lithium metal anode sheet 500 and the solid electrolyte 400. The battery body is composed of a positive electrode plate 100, a solid electrolyte 400, a separator 600, a gel phase lithium metal negative electrode 500, and a current collector 200 arranged in sequence. It is equipped with a positive electrode tab 110 and a negative electrode tab 210 to achieve circuit conduction. A frame-shaped adjustment component 300 is set to integrate the gel phase lithium metal negative electrode 500 and the solid electrolyte 400. Before the cold start of this solid battery, the solid electrolyte 400 can be directionally heated by the internal heating component built into the adjustment component 300 to improve the low-temperature conductivity of the battery. After the solid electrolyte 400 expands due to heat, it reduces the interlayer gap and avoids the problems of poor contact and increased interface impedance caused by low-temperature contraction. The gel-phase lithium metal anode 500 is a gel polymer mixed with lithium particles, which greatly reduces the direct contact area between the highly active lithium metal and the solid electrolyte 400, weakening spontaneous side reactions from the source. Compared with traditional lithium metal anodes, it can not only reduce side reactions and passivation layer formation and improve lithium-ion conduction efficiency, but also avoid the absorption of more heat from the solid electrolyte 400 when the solid electrolyte 400 is heated, thus ensuring the heating efficiency of the solid electrolyte 400, enabling the battery to be quickly started at low temperatures, and improving the self-heating thermal utilization rate of the solid electrolyte 400. The internal expansion component built into the measurement and adjustment component 300 expands when heated and squeezes and gathers the gel phase lithium metal anode sheet 500, causing the gel phase lithium metal anode sheet 500 to push the separator 600 to compact, eliminating interlayer gaps, and allowing the separator 600 to be tightly sandwiched between the anode sheet and the solid electrolyte 400. This addresses the problem of increased gaps caused by the shrinkage of the multilayer structure under low temperature conditions, and further ensures tight contact and stable interface impedance of each functional layer.

[0038] In this embodiment, the top surface of the fixed frame 320 is connected to a wire 322, and a sealing block 321 is sleeved on the outer wall of the wire 322. A slot 311 is opened on one side of the top surface of the rubber frame 310, and the sealing block 321 is inserted into the slot 311. The wire 322 is electrically connected to the internal heating component and the internal expansion component respectively. A unified conductor 322 is led out from the top of the fixed frame 320, which transmits electrical energy to the internal heating and internal expansion components. The conductor 322 is sleeved with a sealing block 321. A matching slot 311 is opened on the top surface of the plastic frame 310. The sealing block 321 is inserted into the slot 311, which realizes the quick positioning, locking and sealing of the fixed frame 320 and the plastic frame 310, realizes the integrated wiring layout, accurate assembly and alignment, and at the same time protects the wiring position to ensure reliable circuit connection.

[0039] In this embodiment, the internal heating component includes an outer electrode ring 350, which is embedded and fixed inside the fixing frame 320. An inner electrode ring 330 is disposed inside the outer electrode ring 350. A first insulating film 380 is sleeved on the outer wall of the inner electrode ring 330 and adheres to the inner wall of the outer electrode ring 350. A second insulating film 390 is adhered to the inner wall of the inner electrode ring 330 and adheres to the outer wall of the solid electrolyte 400. Both the outer electrode ring 350 and the inner electrode ring 330 are electrically connected to the wire 322. The outer electrode ring 350 is electrically connected to the external high-frequency pulse output terminal through the wire 322, and the inner electrode ring 330 is electrically connected to the external high-frequency pulse power supply ground terminal through the wire 322. A heating electrode group is formed by an outer electrode ring 350 and an inner electrode ring 330 nested together. They are respectively connected to the high-frequency pulse output terminal and the ground terminal. After being energized, an alternating magnetic field is formed. With the help of the capacitance effect and charge transport characteristics of the solid electrolyte 400, rapid self-heating is achieved. This not only ensures heating efficiency, but also avoids the side reactions caused by the intervention heating, thus ensuring heating stability. A first insulating film 380 and a second insulating film 390 are respectively provided between the two layers of electrodes and on the inner side of the inner electrode ring 330 to form double insulation and isolation, blocking the conductive path between the electrodes and surrounding components and the solid electrolyte 400, eliminating leakage and stray current, and ensuring the stability and safety of heating the solid electrolyte 400. The ring electrode structure allows for uniform action along the circumference, ensuring full coverage of the 400°C heating range of the solid electrolyte.

[0040] In this embodiment, the inner electrode ring 330 is an annular tube structure; the inner electrode ring 330 is designed as an annular tube hollow structure, with reserved internal space to be filled with heat exchange medium, thereby improving the overall heat exchange and temperature uniformity; the tubular structure has a certain deformation margin, which can buffer the stress caused by thermal expansion and contraction, and avoid rigid compression damage to the solid electrolyte 400.

[0041] In this embodiment, the annular tube structure of the inner electrode ring 330 is filled with insulating oil. Filling the tube of the inner electrode ring 330 with insulating oil utilizes the convection effect of the insulating oil to quickly equalize the temperature of the entire electrode ring, significantly reducing the circumferential temperature difference. At the same time, the insulating oil has good heat absorption capacity, which can absorb excess heat when the temperature is overheated for a short time, slowing down the rate of temperature rise. This, together with the temperature control system, avoids the risk of high-temperature damage and maintains stable interface impedance.

[0042] In this embodiment, the inner expansion component includes an electric heating ring 360, which is embedded and fixed inside the fixing frame 320. A thermal expansion ring 340 is attached and fixed inside the electric heating ring 360. The thermal expansion ring 340 is sleeved on the outer wall of the gel phase lithium metal negative electrode sheet 500. The electric heating ring 360 is electrically connected to the wire 322. The inner expansion component is composed of an electric heating ring 360 and a thermal expansion ring 340. When the electric heating ring 360 is energized, it generates heat, which is transferred to the outer thermal expansion ring 340. The thermal expansion ring 340 is sleeved on the outside of the gel phase lithium metal anode sheet 500. When heated, it expands radially, forming a gathering and squeezing effect on the gel phase lithium metal anode sheet 500, pushing the gel phase lithium metal anode sheet 500 and the separator 600 to adhere to the solid electrolyte 400 side as a whole, actively eliminating interlayer gaps and enhancing the interface contact effect.

[0043] In this embodiment, an inner baffle 312 is fixed to the inner wall of the fixed frame 320 near the current collector 200, and one side of the thermal expansion ring 340 is attached to the inner wall of the inner baffle 312. The inner baffle 312 is set inside the fixed frame 320, and one side of the thermal expansion ring 340 is attached to the end face of the inner baffle 312 to form an axial rigid limit. When the thermal expansion ring 340 is heated and expanded, it is blocked, and the deformation force is all output towards the negative electrode sheet, ensuring that the direction of the expansion force is accurate, effectively improving the gathering and squeezing effect on the negative electrode sheet, while limiting the axial displacement of the component and ensuring long-term operational stability.

[0044] In this embodiment, the measurement and adjustment component 300 further includes a temperature and pressure integrated sensor 370. The temperature and pressure integrated sensor 370 is fixed to the inner wall of the fixing frame 320 and is attached between the side wall of the solid electrolyte 400 and the side wall of the diaphragm 600. The temperature and pressure integrated sensor 370 is electrically connected to the wire 322. The temperature and pressure integrated sensor 370 is installed on the inner wall of the fixing frame 320, and the probe is attached to the junction of the solid electrolyte 400 and the diaphragm 600. It can simultaneously collect interface temperature and contact pressure data in real time. The temperature and pressure integrated sensor 370 transmits the detection signal to the main controller through the wire 322, providing data basis for high-frequency pulse heating, thermal expansion and extrusion and other control actions, and realizing closed-loop precise control.

[0045] In this embodiment, the diaphragm 600 has a convex shape, and the integrated temperature and pressure sensor 370 has a square frame structure. The protruding side of the diaphragm 600 is inserted into the frame structure of the integrated temperature and pressure sensor 370. The convex shape of the diaphragm 600 and the square frame structure of the integrated temperature and pressure sensor 370, with the protruding part of the diaphragm 600 inserted into the sensor frame, achieve precise positioning and limiting of the two, effectively preventing wrinkles and displacement of the diaphragm 600, ensuring that the sensor detection area is always aligned with the interface joint, and improving the accuracy of the detection data.

[0046] In this embodiment, the integrated temperature and pressure sensor 370 is provided with two annular detection areas. The side closer to the fixed frame 320 is the outer detection area, and the side farther away from the fixed frame 320 is the inner detection area. The outer detection area is attached between the inner electrode ring 330 and the thermal expansion ring 340, and the inner detection area is attached between the solid electrolyte 400 and the diaphragm 600. The inner wall of the fixed frame 320 is flush with the inner wall of the thermal expansion ring 340 and the inner wall of the second insulating film 390. The temperature and pressure integrated sensor 370 is equipped with two annular detection zones, an outer and an inner. The outer detection zone monitors the temperature and pressure parameters between the inner electrode ring 330 and the thermal expansion ring 340, providing feedback on the operating status of the heating and expansion components. The inner detection zone monitors the interface parameters between the solid electrolyte 400 and the diaphragm 600, determining the bonding effect. At the same time, the inner walls of the fixing frame 320, the thermal expansion ring 340, and the second insulating membrane 390 are flush, eliminating structural dead corners and ensuring smooth bonding of each component and uniform heat distribution, thus achieving comprehensive monitoring of operating conditions and structural adaptation.

[0047] Specifically, according to Figures 1-10As shown, lithium metal and a gel mixture are mixed to obtain a gel phase lithium mixture. The gel phase lithium mixture is then coated onto the current collector 200, and the separator 600 is pressed flat onto the gel phase lithium mixture. The gel phase lithium mixture overflowing around the separator 600 is scraped off, so that the remaining gel phase lithium mixture forms a gel phase lithium metal anode sheet 500. Then, the glue frame 310 is bonded to the current collector 200. The use of the gel phase lithium metal anode sheet 500 reduces the interfacial resistance, avoids chemical reactions of the layers, reduces the possibility of side reactions and passivation layer formation, thereby improving the conductivity of lithium ions and improving the electrochemical performance of the solid-state battery. Then, the entire measurement and adjustment assembly 300 is inserted into the frame 310, so that the fixing frame 320 is inserted into the frame 310 until the fixing frame 320 and the thermal expansion ring 340 are in contact with the inner baffle 312. The sealing block 321 is inserted into the slot 311 for positioning. The diaphragm 600 is attached to the inner detection area of ​​the temperature and pressure integrated sensor 370, and one side of the diaphragm 600 is inserted into the frame of the temperature and pressure integrated sensor 370. Then, the positive electrode plate 100 with the solid electrolyte 400 is attached to the frame 310, so that the frame 310 is in contact with the inner baffle 312. The opening is closed, and the solid electrolyte 400 is inserted into the inner electrode ring 330. The outer wall of the solid electrolyte 400 is attached to the second insulating film 390. The side of the solid electrolyte 400 away from the positive electrode plate 100 is attached to the inner detection area of ​​the temperature and pressure integrated sensor 370 and the separator 600, so that the separator 600 is tightly attached to the solid electrolyte 400 and the gel phase lithium metal negative electrode sheet 500, thereby obtaining a solid battery. The battery is then wrapped and sealed in the outer shell, leaving only the positive electrode tab 110, the negative electrode tab 210 and the wire 322 exposed. Finally, the positive electrode 110 and the negative electrode 210 are connected to the load circuit, and the wire 322 is connected to the main controller connected to the external power supply. The wire 322 has multiple connection lines integrated inside, and the multiple connection lines are used to make the outer electrode ring 350 electrically connected to the external high-frequency pulse output terminal through the wire 322, the inner electrode ring 330 electrically connected to the ground terminal of the external high-frequency pulse power supply through the wire 322, and the temperature and pressure integrated sensor 370 electrically connected to the main controller. When solid-state batteries are used in low-temperature environments, the conductivity of the solid electrolyte 400 will decrease significantly at low temperatures. Moreover, the solid electrolyte 400 and the gel phase lithium metal anode sheet 500 will shrink at low temperatures, resulting in gaps between the solid electrolyte 400 and the separator 600. This causes fluctuations at the anode interface, leading to a decrease in the overall performance of the battery. If the battery is used directly at this time, the power supply will be unstable and it will be difficult to meet the power supply requirements. Therefore, in low-temperature environments, the temperature and pressure between the solid electrolyte 400 and the separator 600, as well as the temperature and pressure between the inner electrode ring 330 and the thermal expansion ring 340, are detected by the integrated temperature and pressure sensor 370. Low-temperature data and low-pressure signals are then transmitted to the main controller. The main controller then activates an external high-frequency pulse device, causing the inner electrode ring 330 and the outer electrode ring 350 to engage. The alternating magnetic field generated by the inner electrode ring 330 and the outer electrode ring 350 passes through the central solid electrolyte 400. Utilizing the capacitance effect and charge transport characteristics within the battery, the solid electrolyte 400... 0 Rapid heating quickly increases the temperature of the solid electrolyte 400. However, if solid lithium foil is used as the negative electrode of the battery, the thick lithium foil will absorb the self-heating of the solid electrolyte 400 and transfer it to the current collector 200, which will delay the temperature rise of the solid electrolyte 400 and reduce the thermal efficiency. Therefore, the negative electrode in the solid battery uses a gel phase lithium metal negative electrode 500, which can also achieve the effect of anode-free design, remove excess lithium, reduce specific heat capacity, and effectively avoid heat loss of the solid electrolyte 400, thereby ensuring the heating efficiency and effect of the solid electrolyte 400. After heating the solid electrolyte 400, the solid electrolyte 400 expands due to heat, reducing the gap between it and the diaphragm 600. Insulating oil is filled in the inner electrode ring 330. The natural convection of the insulating oil quickly flattens the temperature of the inner electrode ring, keeping the overall circumferential temperature difference within a very small range. This makes the solid electrolyte 400 heat up evenly. In the event of short-term overheating, the insulating oil absorbs heat, slowing down the rate of temperature rise. Then, temperature control is used to avoid the risk of high temperature, making the interface impedance more stable. After the solid electrolyte 400 expands due to heating, the integrated temperature and pressure sensor 370 monitors and transmits the temperature and pressure of the solid electrolyte 400 in real time. When the electrolyte reaches its operating temperature, the pressure data detected by the inner detection area of ​​the integrated temperature and pressure sensor 370 is still too low, indicating that there may still be a gap between the solid electrolyte 400 and the separator 600. The main controller then activates the electric heating ring 360 to heat the thermal expansion ring 340. The integrated temperature and pressure sensor 370 and the inner baffle 312 limit the thermal expansion ring 340, causing the thermal expansion ring 340 to expand internally and compress the gel phase lithium metal anode sheet 500 together. The gel phase lithium metal anode sheet 500 then pushes the separator 600 towards the solid electrolyte 400 until the inner and outer detection areas of the integrated temperature and pressure sensor 370 meet the pressure requirements. This ensures that the separator 600 is tightly attached to the solid electrolyte 400 and the gel phase lithium metal anode sheet 500, ensuring interface stability and thus rapidly improving the overall performance of the battery and ensuring the stability of the battery in low-temperature environments.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. All electrical components mentioned herein are electrically connected to the main controller and 220V AC mains power, and the main controller is a common existing technology such as a computer that performs control functions. Content not described in detail in this specification is prior art known to those skilled in the art.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A solid-state battery with a gel-phase lithium metal anode, characterized in that: The device includes a positive electrode plate and a current collector. A gel-phase lithium metal negative electrode sheet is disposed on one side of the current collector. A diaphragm is disposed on the side of the gel-phase lithium metal negative electrode sheet away from the current collector. A frame-shaped measurement and adjustment assembly is also fixed on one side of the current collector. The gel-phase lithium metal negative electrode sheet is inserted into the measurement and adjustment assembly. The side of the measurement and adjustment assembly away from the current collector is fixedly connected to the side wall of the positive electrode plate. A positive electrode tab is fixed on the top surface of the positive electrode plate. A negative electrode tab is fixed on the top surface of the current collector. A solid electrolyte is disposed on the side wall of the positive electrode plate. The solid electrolyte is inserted into the measurement and adjustment assembly. The diaphragm is attached to the solid electrolyte. The measurement and adjustment assembly includes a rubber frame, which is fixed to the side wall of the current collector. A fixing frame is inserted inside the rubber frame. An internal heating component and an internal expansion component are disposed inside the fixing frame. The internal heating component is attached to the outer wall of the solid electrolyte to heat the solid electrolyte. The internal expansion component is attached to the outer wall of the gel phase lithium metal anode sheet. The internal expansion component expands thermally to gather the gel phase lithium metal anode sheet so that the separator is tightly attached between the gel phase lithium metal anode sheet and the solid electrolyte.

2. A solid-state battery with a gel-phase lithium metal anode according to claim 1, characterized in that: The top surface of the fixed frame is connected to a wire, and a sealing block is sleeved on the outer wall of the wire. A slot is opened on one side of the top surface of the frame, and the sealing block is inserted into the slot. The wire is electrically connected to the internal heating component and the internal expansion component respectively.

3. A solid-state battery with a gel-phase lithium metal anode according to claim 2, characterized in that: The internal heating component includes an outer electrode ring, which is embedded and fixed inside a fixed frame. An inner electrode ring is disposed inside the outer electrode ring. A first insulating film is sleeved on the outer wall of the inner electrode ring and adheres to the inner wall of the outer electrode ring. A second insulating film is adhered to the inner wall of the inner electrode ring and adheres to the outer wall of the solid electrolyte. Both the outer electrode ring and the inner electrode ring are electrically connected to wires. The outer electrode ring is electrically connected to an external high-frequency pulse output terminal through a wire, and the inner electrode ring is electrically connected to the ground terminal of an external high-frequency pulse power supply through a wire.

4. A solid-state battery with a gel-phase lithium metal anode according to claim 3, characterized in that: The inner electrode ring has a ring-shaped tubular structure.

5. A solid-state battery with a gel-phase lithium metal anode according to claim 4, characterized in that: The annular tube structure of the inner electrode ring is filled with insulating oil.

6. A solid-state battery with a gel-phase lithium metal anode according to claim 3, characterized in that: The internal expansion component includes an electric heating ring, which is embedded and fixed inside the fixed frame. A thermal expansion ring is attached and fixed inside the electric heating ring. The thermal expansion ring is sleeved on the outer wall of the gel phase lithium metal negative electrode sheet. The electric heating ring is electrically connected to the wire.

7. A solid-state battery with a gel-phase lithium metal anode according to claim 6, characterized in that: An inner baffle is fixed to the inner wall of the fixed frame near the collector, and the thermal expansion ring is attached to the inner wall of the inner baffle.

8. A solid-state battery with a gel-phase lithium metal anode according to claim 6, characterized in that: The measurement and adjustment assembly also includes an integrated temperature and pressure sensor, which is fixed to the inner wall of the fixed frame and is attached between the side wall of the solid electrolyte and the side wall of the diaphragm. The integrated temperature and pressure sensor is electrically connected to the wire.

9. A solid-state battery with a gel-phase lithium metal anode according to claim 8, characterized in that: The diaphragm has a convex shape, and the integrated temperature and pressure sensor has a square frame structure. The convex side of the diaphragm is inserted into the frame structure of the integrated temperature and pressure sensor.

10. A solid-state battery with a gel-phase lithium metal anode according to claim 9, characterized in that: The integrated temperature and pressure sensor has two annular detection areas. The side closer to the fixed frame is the outer detection area, and the side farther from the fixed frame is the inner detection area. The outer detection area is attached between the inner electrode ring and the thermal expansion ring, and the inner detection area is attached between the solid electrolyte and the diaphragm. The inner wall of the fixed frame is flush with the inner wall of the thermal expansion ring and the inner wall of the second insulating membrane.

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