An all-solid-state battery module and a method of manufacturing the same

Abstract

The application discloses a kind of all-solid-state battery module and preparation method thereof, comprising the following steps: step (1), mixing; step (2), layered material; step (3), solidification setting: forming integrated all-solid-state battery module.The application uses microcrystalline cellulose, hydroxypropyl methyl cellulose, fumed silica, magnesium stearate four-component composite system as solid electrolyte, completely replaces all liquid electrolyte, while matching plant type pore-forming material, mineral type pore-forming material, carbon-based material, starch material core combination, completely excludes all ternary positive electrode material, compatible lithium ion, sodium ion single system and lithium-sodium double system same vehicle application.

Description

Technical Field

[0001] This invention relates to the field of electrochemical energy storage technology, and more specifically, to a method for preparing an all-solid-state battery module. Background Technology

[0002] Existing commercial energy storage batteries are all liquid or semi-solid systems. Even those that are marketed as semi-solid or quasi-solid batteries still contain more than 5% liquid electrolyte. Meanwhile, mainstream ternary batteries (nickel-cobalt-manganese ternary and nickel-cobalt-aluminum ternary) have inherent defects such as high risk of thermal runaway at high temperatures, scarcity of raw materials, and high cost.

[0003] Significant safety hazards exist: the liquid electrolyte contains a large amount of flammable organic solvents, and is prone to leakage, thermal runaway, fire and explosion accidents under conditions of needle puncture, extrusion, overcharging and high temperature. The short circuit problem caused by metal dendrites piercing the separator has never been completely solved, making it difficult to meet the safety test requirements of GB / T 31467.3 and IEC 62133-2. The ternary cathode material has a low thermal decomposition temperature, and is prone to releasing oxygen and causing violent combustion at high temperatures, posing a safety hazard far greater than that of phosphate-based and sodium-based materials.

[0004] Widely misrepresented range: Liquid battery systems have an energy density of only 140-160Wh / kg. When the air conditioning is turned on, the actual range of passenger vehicles is significantly reduced. The range of conventional liquid battery vehicles is generally less than 350km, resulting in a very poor user experience.

[0005] Short cycle life: After 1500-2000 cycles, the capacity integrity rate of conventional liquid lithium iron phosphate batteries is only 80%, which is lower than the cycle life requirements of GB / T 31484 and ISO 12405-4, and cannot meet the long-term use needs of vehicles. The battery replacement cost is high. Ternary batteries have even worse cycle stability and the rate of degradation at high temperature is significantly accelerated.

[0006] Poor temperature adaptability: Liquid batteries experience a sharp drop in activity at low temperatures, cannot be charged and discharged normally below -10℃, and are prone to bulging and failure at high temperatures, failing to meet the wide temperature range operating standards of ISO 12405-1 and IEC 62660; Ternary batteries exhibit extreme fluctuations in high and low temperature performance, further limiting their applicable operating conditions.

[0007] Low fast charging efficiency: Liquid batteries are limited in fast charging, requiring more than 1 hour to charge to 80% and more than 2 hours to charge to 100%, which does not meet the ISO 12405-1 fast charging performance standard.

[0008] Poor structural stability: During the charging and discharging process of the liquid system, the electrode volume expands and contracts, which can easily lead to solid-liquid interface peeling, increased internal resistance, and capacity decay, resulting in a significant reduction in battery life.

[0009] Material and process limitations: Current solid-state battery research and development mostly relies on sulfide and oxide electrolytes, which have complex preparation processes, extremely high costs, and large interfacial impedance, making it difficult to achieve large-scale mass production; at the same time, ternary materials have extremely poor chemical compatibility with plant-based and mineral-based insulating porous materials, which are prone to side reactions and damage to the stability of the material structure, making them unsuitable for green and low-cost energy storage systems.

[0010] Resource and environmental shortcomings: Ternary materials rely on rare metals such as nickel, cobalt, and manganese. Mineral resources are scarce, mining and smelting cause significant pollution, and costs remain high, which does not conform to the sustainable development strategy. In contrast, the plant, mineral, and starch materials used in this invention are abundant, environmentally friendly, non-toxic, and biodegradable, possessing natural industrial advantages.

[0011] Currently, there is no existing technology that uses a combination of all-solid-state electrolytes, plant / mineral porous materials, carbon materials, and starch materials, while simultaneously being compatible with lithium-ion, sodium-ion single-system and lithium-sodium dual-system applications in the same vehicle, completely eliminating ternary cathode materials, achieving truly liquid-free components with controllable weight, accurate range specifications, wide temperature range applicability, and high-efficiency fast charging, and with all parameters simultaneously meeting national, ISO, and IEC international standards. This invention addresses the aforementioned industry pain points by proposing a complete technical solution and filling a technological gap in the industry. Summary of the Invention

[0012] The technical problem this invention aims to solve is to provide an all-solid-state battery module that completely eliminates the flammable and explosive safety hazards of liquid or semi-solid-state batteries, meeting the safety standards of GB / T 31467.3, ISO 12405-4, and IEC 62660, thus achieving battery safety. This invention employs a composite system of microcrystalline cellulose, hydroxypropyl methylcellulose, fumed silica, and magnesium stearate to completely replace all types of liquid electrolytes, achieving all-solid-state ion conduction.

[0013] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0014] A method for fabricating an all-solid-state battery module, characterized by comprising the following steps:

[0015] Step (1), Mixing: All qualified powders are premixed according to mesh size. For the negative electrode, hard carbon, plant-based pore-forming materials, mineral-based pore-forming materials, and starch-based materials are premixed for 2 minutes, then the first solid electrolyte material is added and premixed for 1 minute. The two components are mixed together for 3 minutes, and finally magnesium stearate is added and slowly mixed for 1 minute to form a negative electrode dry powder layer. For the positive electrode, the non-ternary positive electrode active powder is first dispersed, the second solid electrolyte material is added and premixed for 1 minute, mixed together for 2 minutes, and finally magnesium stearate is added and slowly mixed for 1 minute to ensure uniform mixing. Segregation; formation of a positive electrode dry powder layer; the first solid electrolyte material includes microcrystalline cellulose, hydroxypropyl methylcellulose, fumed silica, and magnesium stearate, and the weight ratio of the microcrystalline cellulose, hydroxypropyl methylcellulose, fumed silica, and magnesium stearate is 15:12:5:5; the second solid electrolyte material includes microcrystalline cellulose, hydroxypropyl methylcellulose, fumed silica, and magnesium stearate, and the weight ratio of the microcrystalline cellulose, hydroxypropyl methylcellulose, fumed silica, and magnesium stearate is 6:5:6:4;

[0016] Step (2), layered material laying: the bottom layer of the insulating box is laid with the bottom layer of the insulating box, and the negative current collector, the negative dry powder layer, the middle layer of the insulating layer, the positive current collector, and the positive dry powder layer are placed in sequence. The positive and negative current collectors are staggered to avoid short circuits; after the lithium-sodium dual system has completed its respective layering, it is integrated into the compartments.

[0017] Step (3), solidification and shaping: slowly pour the solidification liquid onto the upper layer of the liquid around the box, air dry at room temperature for 2 hours, dry at low temperature, and then solidify by high voltage electric shock scanning after cooling to form an integrated all-solid-state battery module.

[0018] In the above technical solution, the entire preparation process complies with GB / T 31467.3 and ISO 12405-3 battery manufacturing process and quality control standards, and the use of ternary materials is completely eliminated throughout the process.

[0019] In a further technical solution, in step (2), the raw material composition of the negative electrode dry powder layer includes, by mass percentage: 38% hard carbon HC-980, 12% lotus root powder OF-200, 10% rush pith powder DC-80, 8% maifan stone powder MS-150, 15% microcrystalline cellulose MCC-101, 12% hydroxypropyl methylcellulose HPMC-60SH, 5% fumed silica A200, and 5% magnesium stearate MgSt-99.9.

[0020] In the above technical solution, all powders in the raw materials of the negative electrode dry powder layer meet the requirements of 80-200 mesh gold index mesh number, and the purity of the raw materials meets the GB 40165 battery grade material standard.

[0021] In a further technical solution, in step (2), the raw material composition of the positive electrode dry powder layer includes: by mass percentage, 83% non-ternary positive electrode active material, 6% microcrystalline cellulose MCC-101, 5% hydroxypropyl methylcellulose HPMC-60SH, 6% fumed silica A200, and 4% magnesium stearate MgSt-99.9; the non-ternary positive electrode active material is any one of lithium iron phosphate, lithium manganese iron phosphate, and sodium-based non-ternary positive electrode.

[0022] In the above technical solution, the raw materials of the positive electrode dry powder layer do not contain traditional conductive carbon powder, and the conductivity and ion conduction are achieved entirely by a quaternary composite solid electrolyte system. The active material ratio meets the GB / T 31467.2 electrical performance design standard; the addition of any ternary positive electrode material components is strictly prohibited.

[0023] In a further technical solution, in step (2), the raw material composition of the curing irrigation liquid includes: by weight, 2 parts of microcrystalline cellulose MCC-101, 1.5 parts of hydroxypropyl methylcellulose HPMC-60SH, 1 part of fumed silica A200, and 95.5 parts of water; the preparation method of the supernatant of the curing irrigation liquid is: mix and stir the raw materials and let them stand for 2 hours, and take the upper clear dilute liquid.

[0024] In this invention, the mesh size of all raw material powders is strictly controlled between 80 and 200 mesh. The specific mesh size is determined according to the gold index. That is, the core functional materials (microcrystalline cellulose, hydroxypropyl methylcellulose, fumed silica, hard carbon, and various non-ternary cathode materials) adopt a gold ratio mesh size of 120-180 mesh, while plant-based porous materials, mineral-based porous materials, magnesium stearate, and starch-based materials adopt a gold index mesh size of 80-120 mesh to ensure optimal powder flowability, mixing uniformity, and compaction density.

[0025] Before implementing step (1), the raw materials are screened in multiple stages: after the raw materials enter the factory, they are first screened by a vibrating screen to remove large particles and agglomerated materials; then they are screened by a precision grading screen to strictly screen out powder materials that meet the golden index of 80-200 mesh; after screening, they are dried to strictly control the moisture content of the raw materials to ≤0.5%. Only after the screening is qualified can they enter the mixing process to prevent unqualified materials from affecting battery performance. The whole process complies with the GB 40165 raw material quality control standard; ternary materials are strictly prohibited from entering the incoming material screening and production process.

[0026] In the above technical solution, the battery system comprises a core combination of plant-based porous materials, mineral-based porous materials, electrolytic powder, carbon-based materials, and starch-based materials. Both the plant-based and mineral-based porous materials contain carbon-based materials. The plant-based porous materials include rush powder, lotus root powder, and starch-based plant-based pore-regulating powders. The mineral-based porous materials include mineral-based insulating and supporting powders such as maifanite powder. This combination of materials is synergistically adapted to the quaternary composite solid-state electrolyte system to jointly achieve efficient operation of the all-solid-state battery.

[0027] In the above technical solution, all materials adopt fixed power-specific national standard grades. Incoming materials must undergo multi-stage screening processes to remove large particulate impurities and agglomerated materials, strictly reject ternary materials, and only qualified powders with a moisture content ≤0.5% can enter the mixing process. The core functional materials have a mesh size of 120-180 mesh, and plant / mineral porous materials and starch materials have a mesh size of 80-120 mesh, which meets the GB 40165 raw material quality control standard.

[0028] In a further technical solution, in step (2), the negative current collector is a T2 copper negative current collector; the bottom isolation layer is a magnesium stearate bottom isolation layer; the middle isolation layer is a magnesium stearate middle isolation layer; and the positive current collector is a 1060 aluminum positive current collector.

[0029] In step (2), the insulating box is a 220×120×65mm insulating box.

[0030] In a further technical solution, in step (3), low-temperature drying refers to drying at a low temperature of 55-60℃ for 3-4 hours.

[0031] In the above technical solution, the curing and pouring liquid has no turbidity or sedimentation, is only used for capillary penetration and shaping of powder, and has no liquid electrolyte components.

[0032] In the above technical solution, when the lithium-sodium dual system is used in the same vehicle, it adopts a compartmentalized independent packaging. The lithium battery unit and the sodium battery unit are each independently equipped with a BMS control module, and they can achieve coordinated operation through the vehicle scheduling unit without interfering with or crosstalking with each other.

[0033] In a further technical solution, the all-solid-state battery module operates stably in a wide temperature range of -40℃ to +85℃, and the battery capacity integrity rate is ≥95% after 3500 cycles at room temperature and ≥90% after 5000 cycles.

[0034] The non-ternary cathode active powder of the present invention includes, but is not limited to:

[0035] Lithium-ion systems: phosphate-based cathode materials such as lithium iron phosphate and lithium manganese iron phosphate;

[0036] Sodium ion system: Sodium-based non-ternary cathode materials such as Prussian blue cathodes, layered oxide cathodes, and phosphate-based sodium cathodes. Lithium iron phosphate: LFP-518 (electric vehicle grade); Lithium manganese iron phosphate: LMFP-618 (energy storage grade).

[0037] In this invention, the current collector conductive plate negative electrode copper busbar is T2 pure copper busbar, national standard grade T2-Y2; the positive electrode aluminum busbar is 1060 pure aluminum conductive aluminum busbar, national standard grade 1060-O state.

[0038] This invention employs a quaternary composite solid electrolyte framework formed by a composite system of microcrystalline cellulose, hydroxypropyl methylcellulose, fumed silica, and magnesium stearate. The quaternary composite solid electrolyte framework is uniformly dispersed in the positive and negative electrode dry powder layers and fully combined with plant-based porous materials, mineral-based porous materials, carbon-based materials, and starch-based materials to achieve electronic insulation, ion conduction, and structural stability, completely eliminating the risk of metal dendrite growth and thermal runaway.

[0039] The raw materials of this invention include:

[0040] (1) The mechanism by which the core quaternary composite system of this invention replaces liquid electrolyte is as follows:

[0041] Microcrystalline cellulose: Constructing a three-dimensional rigid solid framework, providing physical support and Li + / Na + Coordination sites, replacing Li in liquid electrolytes + / Na + The carrier function and the diaphragm's physical isolation function;

[0042] Hydroxypropyl methylcellulose: Regulating backbone crystallinity to construct continuous amorphous Li + / Na + Conductive channels reduce ion migration resistance and replace the ion conduction optimization function of liquid electrolytes;

[0043] Fumed silica: fills the pores of the framework, precisely controls the conduction pore size, improves the mechanical strength of the framework, suppresses metal dendrites, and replaces the uniform mass transfer function of liquid electrolyte;

[0044] Magnesium stearate: Passivates the electrode interface, forms a stable solid interface layer, realizes ion selective conduction, and replaces the interface stabilization function of liquid electrolyte.

[0045] The four components work synergistically to achieve electronic insulation, ion conduction, interface stability, and structural robustness, fully matching and surpassing all electrochemical functions of liquid electrolytes. Furthermore, it is compatible with all conventional non-ternary cathode materials, such as lithium iron phosphate, lithium manganese iron phosphate, and sodium-based non-ternary materials.

[0046] Compared with the prior art, the beneficial effects of the present invention are:

[0047] 1. Wide temperature range operating parameters

[0048] Based on the requirements of ISO 12405-4:2018, IEC 62660-2, and GB / T 31467.2 standards, the rated operating temperature range of the all-solid-state battery of this invention is -40℃ to +85℃. Within this temperature range, it can be charged and discharged normally with a capacity retention rate of ≥85%. At -40℃, there is no electrolyte freezing problem, and the charge and discharge performance is stable, far exceeding the IEC 62660-2-20℃ low-temperature discharge standard. At +85℃, there is no thermal runaway, no bulging, and no performance degradation, which is superior to the GB / T 31467.2 high-temperature operating standard and far exceeds the operating temperature range of liquid batteries (-10℃ to +60℃). Both the lithium-sodium dual-system and the lithium-sodium dual-system meet this wide temperature range operating requirements.

[0049] 2. High-efficiency fast charging parameters

[0050] According to GB / T 31484 and ISO 12405-1 fast charging performance standards, under standard fast charging conditions at room temperature (25℃), constant current and constant voltage fast charging mode is adopted:

[0051] 0→50% battery: Fast charging takes 12 minutes;

[0052] 50%→80% battery level: The cumulative fast charging time is 25 minutes, which is far better than the standard requirements of ISO 12405-1 and GB / T 31484 for 0→80% fast charging ≤60 minutes;

[0053] 80%→100% battery level: Total fast charging time: 40 minutes;

[0054] In a low temperature environment of -20℃, it only takes 35 minutes to fast charge to 80% of the battery, and in a high temperature environment of +60℃, it takes no more than 45 minutes to fast charge to 100% of the battery. There are no issues with heat generation or capacity decay during fast charging, which meets the full standard requirements for fast charging in both high and low temperatures. The sodium battery unit can achieve a higher rate of fast charging, further optimizing the energy replenishment efficiency of the entire vehicle.

[0055] 3. Core solid electrolyte composite structure

[0056] The core innovation of this invention lies in the quaternary composite solid electrolyte structure of microcrystalline cellulose MCC-101, hydroxypropyl methylcellulose HPMC-60SH, fumed silica A200, and magnesium stearate MgSt-99.9. This system constructs a three-dimensional solid-state confined ion conduction framework through intermolecular hydrogen bonds and physical cross-linking, which is the core support for the battery to achieve all-solid-state operation, wide temperature range adaptability, and high-efficiency fast charging.

[0057] Microcrystalline cellulose MCC-101 serves as the main skeleton, providing stable physical support, ensuring the strength of the electrode structure, preventing structural collapse during charging and discharging, and meeting the mechanical stability standard of GB / T 31467.1.

[0058] Hydroxypropyl methylcellulose HPMC-60SH improves the toughness and ion conductivity of the skeleton, optimizes the solid-solid interface contact, reduces the interface impedance, ensures high and low temperature ion transport efficiency, and meets the IEC 62660-1 ion conduction efficiency standard.

[0059] Fumed silica A200 fills the pores of the framework, regulates porosity and ion transport channels, improves ion conduction speed, and inhibits metal dendrite growth, supporting high-efficiency fast charging and meeting the electrode structure design requirements of ISO 12405-4.

[0060] Magnesium stearate MgSt-99.9 achieves interface modification and ion-selective conduction, improves electrode interface stability, and eliminates side reactions;

[0061] This quaternary composite structure contains no liquid components, completely replacing all traditional liquid electrolytes and separators, achieving a truly all-solid state. It is only compatible with non-ternary cathode materials and completely excludes ternary cathode materials.

[0062] 4. Security (Core Advantage)

[0063] This invention contains 100% no flammable liquid electrolyte. All materials are nationally standardized inorganic minerals, plant cellulose, starches, and inert salts, completely eliminating high-risk ternary materials and fundamentally preventing thermal runaway, fire, and explosion risks. It has undergone needle penetration, extrusion, high-temperature (85°C), overcharge, and over-discharge tests according to GB / T 31467.3, ISO 12405-4, IEC 62660, and UN 38.3 standards, showing no leakage, short circuits, fire, or explosion. The quaternary composite solid electrolyte framework plus a magnesium stearate separator completely inhibits metal dendrite growth, improving safety performance by more than 10 times compared to existing liquid and ternary batteries, achieving inherent battery safety. It has passed all domestic and international mandatory safety standards. Detailed Implementation

[0064] To better understand the content of this invention, further description is provided below with reference to specific embodiments. It should be understood that these embodiments are only for further illustration of the invention and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the description of this invention, those skilled in the art may make some non-essential modifications or adjustments to the invention, which still fall within the protection scope of this invention.

[0065] Example 1

[0066] Raw material formula:

[0067] The negative electrode dry powder layer (by mass percentage) consists of: hard carbon HC-980 38%, lotus root powder OF-200 12%, rush powder DC-80 10%, maifanite powder MS-150 8%, microcrystalline cellulose MCC-101 15%, hydroxypropyl methylcellulose HPMC-60SH 12%, fumed silica A200 5%, and magnesium stearate MgSt-99.9 5%. All powders meet the 80-200 mesh gold index requirements, and the purity of the raw materials meets the GB 40165 battery-grade material standard.

[0068] The positive electrode dry powder layer (by mass percentage) consists of: 83% non-ternary positive electrode active material (lithium iron phosphate / lithium manganese iron phosphate / sodium-based non-ternary positive electrode), 6% microcrystalline cellulose MCC-101, 5% hydroxypropyl methylcellulose HPMC-60SH, 6% fumed silica A200, and 4% magnesium stearate MgSt-99.9. It contains no traditional conductive carbon powder and relies entirely on a quaternary composite solid electrolyte system for conductivity and ion conduction. The active material ratio conforms to the GB / T 31467.2 electrical performance design standard. The addition of any ternary positive electrode material components is strictly prohibited.

[0069] The curing and grouting solution consists of 2 parts microcrystalline cellulose MCC-101, 1.5 parts hydroxypropyl methylcellulose HPMC-60SH, 1 part fumed silica A200, and 95.5 parts water. After stirring and standing for 2 hours, the upper clear dilute liquid is taken. There is no turbidity or precipitate. It is only used for capillary penetration shaping of powder and contains no liquid electrolyte components.

[0070] The fabrication process of the all-solid-state battery module includes the following:

[0071] (1) All qualified powders are premixed according to mesh size. For the negative electrode, hard carbon, plant-based pore-forming materials, mineral-based pore-forming materials and starch-based materials are premixed for 2 min, then the first solid electrolyte material is added and premixed for 1 min. The two components are mixed together for 3 min, and finally magnesium stearate is added and slowly mixed for 1 min to form a negative electrode dry powder layer. For the positive electrode, the non-ternary positive electrode active powder is first dispersed, the second solid electrolyte material is added and premixed for 1 min, mixed together for 2 min, and finally magnesium stearate is added and slowly mixed for 1 min to ensure uniform mixing without segregation to form a positive electrode dry powder layer.

[0072] (2) Laying process: The bottom of the insulating box is laid with a magnesium stearate bottom layer, and then the T2 copper negative current collector, negative dry powder layer, magnesium stearate middle layer, 1060 aluminum positive current collector, and positive dry powder layer are placed in sequence. The positive and negative current collectors are staggered to avoid short circuits. After the lithium-sodium dual system completes its own laying, it is integrated into separate compartments.

[0073] (3) Shaping process: Slowly pour the clear liquid on the top layer of the solidification pouring liquid around the box, air dry at room temperature for 2 hours, dry at low temperature of 55-60℃ for 3-4 hours, and after cooling, high voltage electric shock scanning solidification to form an integrated all-solid-state battery module.

[0074] The above-mentioned preparation process complies with GB / T 31467.3 and ISO 12405-3 battery manufacturing process and quality control standards, and the use of ternary materials is completely eliminated throughout the process.

[0075] Example 2: Performance test of quaternary solid electrolyte

[0076] This embodiment experimentally verifies that four materials—microcrystalline cellulose, hydroxypropyl methylcellulose, fumed silica, and magnesium stearate—achieve four core properties: electronic insulation, ion conduction, interface stability, and structural robustness. Verification standards: GB / T31467.3, GB / T 31484, ISO 12405, and IEC 62660.

[0077] Component A represents: Microcrystalline cellulose MCC-101, medical grade, specifically for batteries;

[0078] Component B represents: Hydroxypropyl methylcellulose HPMC-60SH, high viscosity insulating grade;

[0079] Component C represents: hydrophobic fumed silica A200 nanometer reinforcing grade;

[0080] Component D represents: Magnesium stearate MgSt-99.9, high-purity interface-modified grade.

[0081] Single A test group: refers to the group with all raw materials and preparation processes being exactly the same as in Example 1, except that the first solid electrolyte is a single microcrystalline cellulose MCC-101 battery-specific medical-grade component; the second solid electrolyte is a single microcrystalline cellulose MCC-101 battery-specific medical-grade component.

[0082] Experimental Group A+B: This group consists of samples with all raw materials and preparation processes identical to those in Example 1. The difference lies in the removal of fumed silica and magnesium stearate from the first solid electrolyte. Similarly, the second solid electrolyte also removes fumed silica and magnesium stearate.

[0083] Experimental groups A+B+C: These groups consist of materials and preparation processes identical to those in Example 1, except that magnesium stearate was removed from the first solid electrolyte. Magnesium stearate was also removed from the second solid electrolyte.

[0084] Quaternary synergistic experimental group: namely, Example 1.

[0085] Table 1 Standard Test Table for Electronic Insulation Performance of All Groups

[0086]

[0087] The table shows that the insulation conclusion is that only the quaternary system achieves complete sealing of the macroscopic framework, microscopic pores, and electrode interface, completely blocking electron conduction, and preventing leakage and micro-short circuits at high and low temperatures.

[0088] Table 2 Standard Test Table for Ion Conductivity Performance of All Groups

[0089]

[0090] The table above shows that magnesium stearate completes the interface stress release and passivation treatment, and the quaternary system completely solves the common problems of poor solid-solid interface contact and impedance drift in solid-state batteries.

[0091] Table 3 Standard Test Table for Structural Mechanical Strength Performance of All Groups

[0092]

[0093] The table above shows that Example 1 achieves a four-dimensional combination of rigid shaping, flexible toughening, nano-reinforcement, and stress relief, resulting in no softening when heated, no brittle fracture when cooled, and no collapse under pressure.

[0094] The foregoing description is not intended to limit the invention, nor is the invention limited to the examples given. Any changes, modifications, additions, or substitutions made by those skilled in the art within the scope of the invention should also be considered within the protection scope of the invention.

Claims

1. A method for fabricating an all-solid-state battery module, characterized in that, Includes the following steps: Step (1), Mixing: All qualified powders are premixed according to mesh size. For the negative electrode, hard carbon, plant-based pore-forming materials, mineral-based pore-forming materials, and starch-based materials are premixed for 2 minutes, then the first solid electrolyte material is added and premixed for 1 minute. The two components are mixed together for 3 minutes, and finally magnesium stearate is added and slowly mixed for 1 minute to form a negative electrode dry powder layer. For the positive electrode, the non-ternary positive electrode active powder is first dispersed, the second solid electrolyte material is added and premixed for 1 minute, mixed together for 2 minutes, and finally magnesium stearate is added and slowly mixed for 1 minute to ensure uniform mixing. Segregation; formation of a positive electrode dry powder layer; the first solid electrolyte material includes microcrystalline cellulose, hydroxypropyl methylcellulose, fumed silica, and magnesium stearate, and the weight ratio of the microcrystalline cellulose, hydroxypropyl methylcellulose, fumed silica, and magnesium stearate is 15:12:5:5; the second solid electrolyte material includes microcrystalline cellulose, hydroxypropyl methylcellulose, fumed silica, and magnesium stearate, and the weight ratio of the microcrystalline cellulose, hydroxypropyl methylcellulose, fumed silica, and magnesium stearate is 6:5:6:4; Step (2), layered material laying: the bottom layer of the insulating box is laid with the bottom layer of the insulating box, and the negative current collector, the negative dry powder layer, the middle layer of the insulating layer, the positive current collector, and the positive dry powder layer are placed in sequence. The positive and negative current collectors are staggered to avoid short circuits; after the lithium-sodium dual system has completed its respective layering, it is integrated into the compartments. Step (3), solidification and shaping: slowly pour the solidification liquid onto the upper layer of the liquid around the box, air dry at room temperature for 2 hours, dry at low temperature, and then solidify by high voltage electric shock scanning after cooling to form an integrated all-solid-state battery module.

2. The method for preparing an all-solid-state battery module according to claim 2, characterized in that, In step (2), the raw material composition of the negative electrode dry powder layer includes, by mass percentage: 38% hard carbon HC-980, 12% lotus root powder OF-200, 10% rush pith powder DC-80, 8% maifan stone powder MS-150, 15% microcrystalline cellulose MCC-101, 12% hydroxypropyl methylcellulose HPMC-60SH, 5% fumed silica A200, and 5% magnesium stearate MgSt-99.

9.

3. The method for preparing an all-solid-state battery module according to claim 2, characterized in that, In step (2), the raw material composition of the positive electrode dry powder layer includes, by mass percentage, 83% non-ternary positive electrode active material, 6% microcrystalline cellulose MCC-101, 5% hydroxypropyl methylcellulose HPMC-60SH, 6% fumed silica A200, and 4% magnesium stearate MgSt-99.9; the non-ternary positive electrode active material is any one of lithium iron phosphate, lithium manganese iron phosphate, and sodium-based non-ternary positive electrode.

4. The method for preparing an all-solid-state battery module according to claim 2, characterized in that, In step (2), the raw material components of the curing irrigation liquid include: by weight, 2 parts of microcrystalline cellulose MCC-101, 1.5 parts of hydroxypropyl methylcellulose HPMC-60SH, 1 part of fumed silica A200, and 95.5 parts of water; the preparation method of the supernatant of the curing irrigation liquid is as follows: mix and stir the raw materials and let them stand for 2 hours, and take the upper clear dilute liquid.

5. The method for preparing an all-solid-state battery module according to claim 2, characterized in that, In step (2), the negative current collector is a T2 copper negative current collector; the bottom isolation layer is a magnesium stearate bottom isolation layer; the middle isolation layer is a magnesium stearate middle isolation layer; and the positive current collector is a 1060 aluminum positive current collector.

6. The method for preparing an all-solid-state battery module according to claim 2, characterized in that, In step (3), low-temperature drying refers to drying at a low temperature of 55-60℃ for 3-4 hours.

7. The method for preparing an all-solid-state battery module according to claim 2, characterized in that, The all-solid-state battery module operates stably in a wide temperature range of -40℃ to +85℃, and the battery capacity integrity rate is ≥95% after 3500 cycles at room temperature and ≥90% after 5000 cycles.

8. A method for preparing an all-solid-state battery module, characterized in that, It is prepared using any one of claims 1-7.

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