A pressurizable rechargeable solid state battery pack

Abstract

The application relates to the technical field of solid-state batteries, and discloses a solid-state battery pack capable of being pressurized and charged, which comprises a solid-state battery pack and pressure plates press-connected to the upper and lower surfaces of the solid-state battery pack, the pressure plates are arranged in two groups or more along the length direction of the solid-state battery pack, the pressure plates on the upper and lower surfaces of the solid-state battery pack are connected to each other through long screw rods, two groups or more of tightening belts in the shape of waist holes are sleeved along the arrangement direction of the pressure plates, expansion rods are arranged at both ends of the solid-state battery pack, and the two ends of the tightening belts are respectively sleeved on the expansion rods at both ends; the multiple groups of pressure plate structures guarantee that the pressure distribution of each region of the solid-state battery pack is uniform, the multiple groups of small-size pressure plates do not need to process large-size whole plates, material cutting waste is reduced, production cost is lowered, and the self-weight of the battery pack is greatly reduced under the same pre-tightening pressure.

Description

Technical Field

[0001] This invention relates to the field of solid-state battery technology, specifically to a solid-state battery pack that can be charged under pressure. Background Technology

[0002] Solid-state batteries are a new type of electrochemical energy storage device that replaces the "liquid electrolyte + separator" combination in traditional liquid lithium batteries with a solid electrolyte. As a recognized next-generation core energy storage technology, it not only solves the safety hazards of traditional liquid batteries such as easy leakage and flammability, but also increases energy density by more than 30% when combined with high-capacity electrode materials. At the same time, it can suppress lithium dendrite growth and extend cycle life, and solve the problems of sudden drop in range at low temperatures and performance degradation at high temperatures. It is a key direction to promote the comprehensive upgrade of electrochemical energy storage in terms of safety, range, and service life. In the future, it will be applied in high-end consumer electronics and special equipment, and gradually applied in new energy vehicles and energy storage fields.

[0003] Since the solid electrolyte and positive and negative electrodes of solid-state batteries are both solid, even if they are bonded together during processing, microscopic pores or unevenness still exist on their surfaces, easily forming a large number of interface gaps. This leads to the breakage of ion conduction pathways and a sharp increase in interface impedance, seriously affecting the charging and discharging efficiency and capacity of the battery. Therefore, existing solid-state batteries generally require pressurization. For example, Chinese patent CN117832738A proposes a solid-state battery pressurization device and a solid-state battery, including a pressurization bag and a fastening device. The pressurization bag is provided with at least two bags, which are arranged along the thickness direction of the pressurization bag. The pressurization bag is a flat bag made of flexible material, and a space for placing the battery cell is formed between two adjacent pressurization bags. The fastening device is located on the outside of the pressurization bag and is used to limit the overall thickness of the device. However, this pressurization method has obvious defects when used in solid-state battery packs. When a solid-state battery in the solid-state battery pack expands during battery charging, the device cannot provide targeted pressurization for this specific expanded battery, which will eventually lead to the battery's expansion becoming more and more serious. Summary of the Invention

[0004] (a) Technical problem to be solved: In view of the shortcomings of the prior art, the present invention provides a solid-state battery pack that can be pressurized and charged, which has the advantage of individually increasing the pressure on the expanded batteries in the battery pack, and solves the problem that the existing pressurization structure cannot specifically pressurize the batteries in the battery pack.

[0005] (II) Technical Solution: To achieve the above-mentioned purpose of individually increasing the pressure on the expanded battery in the battery pack, the present invention provides the following technical solution: a pressurizable and rechargeable solid-state battery pack, comprising a solid-state battery pack and pressure plates pressed onto the upper and lower surfaces of the solid-state battery pack. Two or more pressure plates are arranged along the length of the solid-state battery pack, and the pressure plates on the upper and lower surfaces of the solid-state battery pack are interconnected by long screws. Two or more sets of waist-shaped tightening straps are fitted onto the two or more sets of pressure plates along their arrangement direction. Expansion rods are provided at both ends of the solid-state battery pack. The two ends of the tightening straps are respectively fitted onto the expansion rods at both ends. The expansion rods stretch the waist-shaped tightening straps to generate tension, so that the upper and lower straight sections are respectively pressed onto the pressure plates located on the upper and lower surfaces of the solid-state battery pack. The pressing pressure of the tightening straps on the pressure plates is changed by adjusting the distance between the two sets of expansion rods.

[0006] Preferably, each set of expansion rods is equipped with support rods at both ends, and a piston module is provided between the support rods and the long screw to drive the support rods to extend and retract along their axial direction. The piston module is fixedly connected to the long screw. When the piston modules on both sides drive the support rods to extend, the tension of the tightening band increases, causing its upper and lower straight sections to move closer together. When the piston modules drive the support rods to retract, the tension of the tightening band decreases, causing its upper and lower straight sections to move away from each other.

[0007] Preferably, the long screw is provided with bolts and presses the pressure plate onto the surface of the solid-state battery pack; the width of the pressure plate is greater than the width of the solid-state battery pack, and the long screw is installed on both sides of the pressure plate.

[0008] Preferably, the tightening band consists of an airbag strip filled with gas and two or more sets of straps. Both the airbag strip and the straps are closed-loop and fitted onto the pressure plate along the length of the solid-state battery pack. The two ends of the airbag strip are fitted onto the expansion rod. The straps are fitted onto the airbag strip, and the airbag strip supports the straps. Two or more sets of straps are arranged in an equidistant array along the width of the solid-state battery pack. The inner ring surface of the airbag strip is attached to the pressure plate. When the solid-state battery pack expands and deforms the pressure plate, the pressure plate compresses the airbag strip, causing the gas inside the airbag strip between the pressure plate and the straps to be displaced. The inner walls of the airbag strip in this area come into contact with each other, thereby allowing the straps to indirectly apply locally enhanced pressure to the pressure plate through the airbag strip.

[0009] Preferably, the closed-loop circumference of the strap is greater than the closed-loop circumference of the airbag strip, and the strap and the airbag strip are fixed together by a strap; the airbag strip is provided with an inflation hole, and an air pump is connected to the inflation hole, and a pressure sensor for monitoring the internal pressure of the airbag strip is provided on the air pump.

[0010] Preferably, the airbag strip is made of a flexible, friction-resistant material, and a friction coating is provided at the junction of the airbag strip and the expansion rod.

[0011] Preferably, the pressure plate has square cooling holes, and a cooling strip filled with coolant is provided in the cooling holes. The cooling strip passes through the cooling holes on two or more pressure plates in sequence along the length of the solid-state battery pack. The cooling strip is waist-shaped and has cooling pipes at both ends. The cooling pipes are filled with circulating coolant and are connected to a cooling module. The two ends of the cooling pipes are fixedly connected to the piston module.

[0012] Preferably, the expansion rod is provided with a limiting ring to restrict the axial movement of the tightening band.

[0013] Preferably, the cross-section of the cooling hole is in a periodic, wavy shape.

[0014] Preferably, the pressure plate is provided with a limiting structure to restrict the displacement of the solid-state battery pack, and two or more guide plates are connected between two or more pressure plates located on the same side of the solid-state battery pack. The guide plates make the working surfaces of two or more pressure plates on the same side of the solid-state battery pack coplanar, and the guide plates are fixedly connected to the pressure plates by the long screw.

[0015] Preferably, the solid-state battery pack contains multiple solid-state batteries.

[0016] (III) Beneficial Effects: Compared with the prior art, the present invention provides a solid-state battery pack that can be charged under pressure, which has the following beneficial effects:

[0017] 1. This pressurized and rechargeable solid-state battery pack, through the combined use of a pressure plate structure and a long screw structure, can directly apply pressure to the target battery area through corresponding contact with the solid-state battery, compared to the traditional single-piece pressure plate. This effectively avoids pressure loss or concentration caused by excessive contact area and excessively long force transmission path, ensuring uniform pressure distribution in all areas of the solid-state battery pack. At the same time, it can avoid deformation due to overload when the solid-state battery expands locally, significantly improving the deformation resistance and overall structural stability of the pressure plate structure. Furthermore, this multi-set small-sized pressure plate eliminates the need to process large-sized single-piece plates, reducing material cutting waste, lowering production costs, and significantly reducing the weight of the battery pack under the same pre-tightening pressure.

[0018] 2. This pressurizable solid-state battery pack, through the combined use of a tension band structure and an expansion rod structure, allows the tension band to achieve directional convergence of tension force when a single battery in the solid-state battery pack expands, causing deformation of the pressure plate. This concentrates the pressure on the deformation point, forming a reverse constraint that directly counteracts the battery expansion force, thus achieving targeted pressurization of locally expanded batteries. This effectively solves the defect of existing pressurization structures that cannot accurately pressurize a single expanded battery. This concentrated pressure can promptly suppress further deformation of the pressure plate, preventing local expansion from intensifying and affecting other solid-state batteries, thereby extending the service life of the solid-state battery pack.

[0019] 3. This pressurizable and rechargeable solid-state battery pack, through the combined use of a rope structure and an airbag strip structure, can adaptively concentrate the originally uniformly distributed pressure on the expansion point when individual solid-state batteries in the solid-state battery pack expand, forming a local high-pressure zone. This effectively suppresses further deformation of the solid-state battery, while the pressure plate in the undeformed area can still maintain a stable pre-tightening pressure, ensuring the overall pressure stability of the solid-state battery pack. This achieves uniform pressure distribution across the pressure plate and adaptive pressure adjustment for the deformation point of the pressure plate. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the pressurizable rechargeable solid-state battery pack of the present invention;

[0021] Figure 2 This is a front view of the structure of the pressurized and rechargeable solid-state battery pack of the present invention;

[0022] Figure 3 This is a top view of the structure of the pressurizable rechargeable solid-state battery pack of the present invention;

[0023] Figure 4 This is a cross-sectional view of the pressure plate structure of the pressurized and rechargeable solid-state battery pack of the present invention.

[0024] Figure 5 This is a three-dimensional schematic diagram of the tensioning strap structure of the pressurized and rechargeable solid-state battery pack in this invention.

[0025] Figure 6 This is a cross-sectional view of the tensioning strap structure of the pressurized and rechargeable solid-state battery pack of the present invention.

[0026] Figure 7 This is a schematic diagram of the deformation of the pressure plate structure of the pressurized and rechargeable solid-state battery pack in this invention.

[0027] In the diagram: 1. Solid-state battery pack; 2. Pressure plate; 21. Cooling hole; 22. Limiting structure; 3. Long screw; 31. Bolt; 4. Fastening band; 41. Airbag strip; 42. Inflation hole; 43. Cable tie; 5. Expansion rod; 51. Limiting ring; 6. Support rod; 7. Piston module; 8. Cooling band; 9. Cooling pipe; 10. Guide plate. Detailed Implementation

[0028] 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, and 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.

[0029] Please see Figures 1-6 This invention relates to a pressurizable and rechargeable solid-state battery pack, comprising a solid-state battery pack 1 and pressure plates 2 pressed onto the upper and lower surfaces of the solid-state battery pack 1. Two or more pressure plates 2 are arranged along the length of the solid-state battery pack 1. Multiple pressure plates 2 can form corresponding contacts with the battery cells through a segmented layout to ensure that the pressure is accurately applied to each battery cell area. The pressure plates 2 are designed as flat rectangular structures, and the working surfaces are polished to ensure good adhesion to the surface of the solid-state battery pack 1 and reduce interface gaps. The pressure plates 2 on the upper and lower surfaces of the solid-state battery pack 1 are connected to each other by long screws 3. The long screws 3 should be made of high-strength alloy material, and the surface should be treated with anti-corrosion. The connection holes between the long screws 3 and the pressure plates 2 need to be guided to ensure the coaxiality of the upper and lower pressure plates 2 during assembly and to avoid pressure imbalance due to assembly deviation. Two or more pressure plates 2 are fitted with two or more waist-shaped tightening straps 4 along their arrangement direction. The waist shape allows the straight sections to fit tightly against the surface of the pressure plate 2, ensuring uniform pressure transmission, while the curved sections adapt to the shape of the expansion rods 5, preventing localized wear of the tightening straps 4 during stretching. Expansion rods 5 are provided at both ends of the solid-state battery pack 1. The two ends of the tightening straps 4 are respectively fitted onto the expansion rods 5 at both ends. The expansion rods 5 have a cylindrical structure with an anti-slip surface, and their length must be compatible with the width of the pressure plates 2. The expansion rods 5 stretch the waist-shaped tightening straps 4, generating tension so that their two straight sections press against the pressure plates 2 located on the upper and lower surfaces of the solid-state battery pack 1. The pressing pressure of the tightening straps 4 on the pressure plates 2 is changed by adjusting the distance between the two sets of expansion rods 5.

[0030] Please see Figures 1-6Each set of expansion rods 5 is equipped with support rods 6 at both ends. The support rods 6 are rigid solid rods with straight surfaces to ensure smooth extension and retraction. The connection between the support rods 6 and the expansion rods 5 must be detachable for easy maintenance. A piston module 7 is installed between the support rods 6 and the long screw 3 to drive the support rods 6 to extend and retract along their axial direction. The piston module 7 uses a ball screw driven by a servo motor or a hydraulic cylinder structure. The piston module 7 is fixedly connected to the long screw 3. The piston module 7 can quickly change the distance between the expansion rods 5 by driving the support rods 6 to extend and retract, thereby adjusting the tension of the tightening band 4. When the piston modules 7 on both sides drive the support rods 6 to extend, the tightening band 4 is stretched and the tension increases, causing the upper and lower straight sections to move closer together. When the piston modules 7 drive the support rods 6 to retract, the tightening band 4 is relaxed and the tension decreases, causing the upper and lower straight sections to move away from each other. A bolt 31 is installed on the long screw 3, pressing the pressure plate 2 onto the surface of the solid-state battery pack 1. The pre-tightening effect of the bolt 31 provides initial clamping force to the pressure plate 2, ensuring that the pressure plate 2 is tightly attached to the surface of the battery cell when the solid-state battery pack 1 is not in operation. The bolt 31 adopts an anti-loosening structure with anti-loosening washers and a fine thread design. The width of the pressure plate 2 is greater than the width of the solid-state battery pack 1. The long screw 3 is installed on both sides of the pressure plate 2. The side-mounted long screw 3 can provide symmetrical support force for the pressure plate 2, preventing the pressure plate 2 from bending under pressure. The connection hole between the long screw 3 and the pressure plate 2 is countersunk. The pressure plate 2 is provided with a limiting structure 22 to restrict the displacement of the solid-state battery pack 1. The limiting structure 22 prevents the solid-state battery pack 1 from horizontal displacement during charge-discharge cycles, vibration, or transportation. The limiting structure 22 is a boss that fits the edge of the solid-state battery pack 1, and a flexible buffer layer is provided on its inner side to avoid hard contact between the battery pack and the limiting structure 22, which could cause damage to the outer casing. Two or more guide plates 10 are connected between two or more pressure plates 2 located on the same side of the solid-state battery pack 1. The guide plates 10 ensure that the working surfaces of the two or more pressure plates 2 on the same side of the solid-state battery pack 1 are coplanar. The guide plates 10 and the pressure plates 2 are fixedly connected by long screws 3. The guide plates 10 can solve the problem of non-coplanar working surfaces that easily occurs after multiple pressure plates 2 are assembled. The solid-state battery pack 1 contains multiple solid-state batteries.

[0031] Please see Figures 1-6During installation, firstly, based on the length of the solid-state battery pack 1 and the number of internal batteries, select and configure the corresponding number of pressure plates 2. Arrange these pressure plates 2 on the upper and lower surfaces of the solid-state battery pack 1 respectively, and use guide plates 10 to ensure that the working surfaces of all pressure plates 2 on the same side are coplanar. Next, use multiple long screws 3 to connect the corresponding upper and lower pressure plates 2 through, and fix the upper and lower pressure plates 2 to each other with bolts 31, so that the pressure plates 2 apply an initial clamping force to the solid-state battery pack 1. Then, fix piston modules 7 on the long screws 3 located at the outermost ends of the battery pack, at the position between the upper and lower pressure plates 2 respectively, and the width of the piston modules 7 is less than the height of the solid-state battery pack 1. Finally, put the tension strap 4 on the expansion rods 5 at both ends, and drive the expansion rods 5 on both sides away from each other through the piston modules 7 at both ends, so that the tension strap 4 is stretched and generates tension force. Its two straight sections press against the surfaces of the upper and lower pressure plates 2 respectively, thereby forming an effective, uniform and adjustable pressure on the pressure plates 2.

[0032] Please see Figures 1-6 When the solid-state battery pack 1 expands, the pre-tightening pressure provided by the pressure plates 2 on its upper and lower surfaces can effectively suppress the expansion trend. Furthermore, the pressure plates 2 in this invention are not a single, traditional structure, but rather designed and configured according to the actual number of solid-state batteries inside the solid-state battery pack 1. This multi-plate design, compared to a single pressure plate 2, allows each plate to form segmented contact with its corresponding solid-state battery. This contact method allows pressure to act directly on a single or a few solid-state battery areas, avoiding pressure loss or concentration caused by the large contact area and long force transmission path of a traditional single pressure plate 2, thus achieving uniform pressure transmission to all areas of the battery pack. Simultaneously… The stress range of a single pressure plate 2 is limited to the corresponding solid-state battery area, resulting in concentrated stress and a more compact structure. When the solid-state battery pack 1 expands locally, the expansion force only acts on the small-sized pressure plate 2 in the corresponding area. Unlike a single pressure plate 2, which has to bear the stress of a large area, it will not cause local stress overload. This effectively reduces the probability of deformation of the pressure plate 2 itself and greatly improves structural stability. At the same time, multiple small-sized pressure plates 2 do not require the processing of large-sized whole plates, which can reduce material cutting waste and save production costs. Moreover, under the premise of providing the same pre-tightening pressure to the solid-state battery pack 1, the overall weight of multiple pressure plates 2 is much lighter than that of a single pressure plate 2, thereby reducing the weight of the entire solid-state battery pack.

[0033] Please see Figures 1-7When a solid-state battery pack 1 expands, the expansion force directly acts on the pressure plate 2 at the corresponding position, causing the pressure plate 2 to convex upward. This upward convex deformation pushes up the tension band 4 that is pressed against the surface of the pressure plate 2, causing the tension band 4 to be subjected to additional upward stretching in the deformation area. Its overall tension force is significantly increased, and the tension force that was originally evenly distributed on the surface of the pressure plate 2 converges to the deformation point. At the same time, the upward convexity of the pressure plate 2 makes the deformation point the point of force concentration where the tension band 4 contacts the pressure plate 2. The pressure converted by the tension band 4 is no longer evenly transmitted along the plane of the pressure plate 2, but is concentrated at this focal point, making the pressure on the deformation point much higher than that in other areas. This concentrated pressure can directly offset the continuous squeezing force generated by the expansion of the solid-state battery on the pressure plate 2, thereby suppressing further deformation of the pressure plate 2.

[0034] Please see Figures 1-7 The tightening band 4 consists of an airbag strip 41 filled with gas and two or more sets of straps 43. The airbag strip 41 and the straps 43 are all in a closed loop shape and are fitted onto the pressure plate 2 along the length of the solid-state battery pack 1. The closed loop shape allows the airbag strip 41 and the straps 43 to completely surround the overall outline of the pressure plate 2, so that the pressure is evenly applied to the circumference of the pressure plate 2 and avoids local pressure breaks. The airbag strip 41 is made of aramid fiber reinforced rubber or polyurethane composite fabric. The cross-section of the airbag strip 41 is a flat rectangle to maximize its contact area with the pressure plate 2 and improve pressure transmission efficiency. The edges of the airbag strip 41 need to be rounded and the material thickness needs to be uniform to prevent local pressure deviations due to uneven thickness after inflation. The airbag strip 41 is fitted onto the expansion rod 5 at both ends, and the straps 43 are fitted onto the airbag strip 41, with the airbag strip 41 supporting the straps 43. Two or more sets of straps 43 are arranged in an equidistant array along the width direction of the solid-state battery pack 1. This equidistant array arrangement allows the straps 43 to uniformly cover the entire width direction of the solid-state battery pack 1, ensuring that no matter where expansion occurs, there is a corresponding strap 43 that responds and generates localized enhanced pressure. Furthermore, the straps 43 must remain parallel and not overlap each other to prevent the straps 43 from crossing and interfering with each other's tension. The surface of the straps 43 can be coated with a low-friction coefficient wear-resistant coating to reduce relative frictional loss between them and the airbag strip 41. The inner ring surface of the airbag strip 41 is attached to the pressure plate 2. When the solid-state battery pack 1 expands and deforms the pressure plate 2, the pressure plate 2 squeezes the airbag strip 41, causing the gas inside the airbag strip 41 between the pressure plate 2 and the cable tie 43 to be discharged. The inner walls of the airbag strip 41 in this area come into contact with each other, thereby allowing the cable tie 43 to indirectly apply locally enhanced pressure to the pressure plate 2 through the airbag strip 41.

[0035] Please see Figures 1-7The closed-loop circumference of the strap 43 is greater than that of the airbag strip 41, and the strap 43 is fixed to the airbag strip 41 by a strap. The strap is used to prevent the strap 43 from sliding along the surface of the airbag strip 41 during inflation, deformation, or stretching of the tightening strap 4, ensuring that the strap 43 always corresponds to the preset pressurization area and avoiding local pressurization deviation due to strap displacement. The airbag strip 41 is provided with an inflation hole 42, and an air pump is connected to the inflation hole 42. The air pump can replenish or release gas to the airbag strip 41 through the inflation hole 42, ensuring that the airbag strip 41 can always provide a suitable initial preload. The air pump is equipped with a pressure sensor to monitor the internal pressure of the airbag strip 41. The pressure sensor can monitor the pressure of the airbag strip 41 in real time to avoid excessive or insufficient pressure. A friction coating is provided at the junction of the airbag strip 41 and the expansion rod 5. The friction coating uses a polytetrafluoroethylene modified coating or a ceramic particle reinforced coating. The friction coating needs to cover the area where the airbag strip 41 and the expansion rod 5 are in direct contact, but does not need to cover the entire surface of the airbag strip 41. This avoids excess coating affecting the fit between the airbag strip 41 and the pressure plate 2. The coating surface is slightly roughened to further improve the coefficient of friction.

[0036] Please see Figures 1-7 Through the combined design of the airbag strip 41 and the binding rope 43, when a group of solid-state batteries in the solid-state battery pack 1 expands, the binding band 4 can maintain a uniform pressure distribution on the pressure plate 2 as a whole, and can also adaptively adjust the pressure to increase at the deformation point of the pressure plate 2. Figure 7As shown, when the pressure plate 2 deforms upwards due to the expansion of the solid-state battery, the upward protrusion exerts an upward compressive force on the airbag strip 41 located between the pressure plate 2 and the strap 43. This compressive force causes the gas inside the airbag strip 41 at the deformation point to be displaced to the surrounding unforced area. As the gas gradually displaces, the chamber structure of the airbag strip 41, which was originally supported by gas, disappears, and its upper and lower inner walls come into contact with each other. At this time, the compressive force of the upward protrusion is no longer buffered by the gas, but is directly transmitted to the strap 43 above through the inner walls of the airbag strip 41. The rope 43 is in a closed-loop tension state. When it is subjected to the additional upward thrust, it will be stretched, resulting in an increase in its tension. The change in the tension of the rope 43 will break the original uniform pressure distribution. Since the deformation point is the source of force, the pressure generated by the tension of the rope 43 will be concentrated at that point first, so that the pressure originally dispersed on the surface of the pressure plate 2 is concentrated on the upper protrusion. This greatly increases the pressure on the upper protrusion, forming a reverse constraint force to counteract the expansion force of the solid battery, thereby suppressing further deformation of the solid battery. Furthermore, when the airbag strip 41 located at the protrusion on the pressure plate 2 is compressed, the gas inside the airbag strip 41 in that area is only discharged to a small surrounding area, without causing a large fluctuation in the internal pressure of the entire airbag strip 41. The airbag strips 41 in other positions can still maintain their original inflation state, thus continuously applying stable pressure to the pressure plate 2. Meanwhile, the other parts of the tensioned ropes 43 can still be supported by the airbag strips 41, and the other ropes 43 are not disturbed by this process. Therefore, when the pressure plate 2 deforms, only the pressure at the deformation point increases, while the pressure at other undeformed points remains stable. At the same time, by adjusting the number of ropes 43 on the airbag strips 41, multiple sets of ropes 43 can cover most of the area of ​​the pressure plate 2, thereby suppressing the local expansion of the solid-state battery pack 1. Furthermore, by controlling the internal gas pressure of the airbag strip 41 with an air pump, the overall pressure of the airbag strip 41 on the pressure plate 2 and the supporting force of the airbag strip 41 on the strap 43 can be further changed. When the internal gas pressure of the airbag strip 41 increases, the strap 43 will have a higher pre-tension even in the initial state before being squeezed by the pressure plate 2. At the same time, during the operation of the solid-state battery pack 1, the air pump circulates the gas inside the strap 43, which can effectively reduce the surface temperature of the pressure plate 2 and improve the heat dissipation efficiency of the pressure plate 2.

[0037] Please see Figures 1-7The pressure plate 2 has square cooling holes 21, and a cooling band 8 filled with coolant is installed inside the cooling holes 21. The cooling band 8 passes through the cooling holes 21 on two or more pressure plates 2 along the length of the solid-state battery pack 1. The square cooling holes 21 provide a stable installation space for the cooling band 8, preventing it from shifting within the pressure plate 2. The coolant in the cooling band 8 can remove heat from the pressure plate 2 through heat exchange. Passing through multiple pressure plates 2 along the length ensures that all segmented pressure plates 2 can be cooled, preventing local pressure plates 2 from overheating due to insufficient heat dissipation. The cooling band 8 is waist-shaped with cooling pipes 9 at both ends. The straight upper and lower sections of the waist-shaped section correspond to the cooling holes 21 on the surface of the pressure plate 2, ensuring that the cooling band 8 can be stably embedded in the cooling holes 21 of multiple pressure plates 2. The arc-shaped section can adapt to the contour of the expansion rods 5 at both ends of the solid-state battery pack 1, preventing the cooling band 8 from folding or being overstretched at the ends, and ensuring a smooth coolant circulation path. Cooling pipe 9 contains circulating coolant and is connected to a cooling module. The cooling pipe 9 enables the delivery and circulation of coolant, and the cooling module cools the heated coolant, ensuring it remains at a low temperature for efficient heat dissipation. Both ends of the cooling pipe 9 are fixedly connected to the piston module 7. A limiting ring 51 is provided on the expansion rod 5 to restrict the axial movement of the tension band 4. This prevents the tension band 4 from sliding along the axial direction of the expansion rod 5 during stretching or loosening. The limiting ring 51 must be coaxial with the expansion rod 5 to ensure it evenly blocks the tension band 4. The cooling hole 21 has a periodically cyclical wave-like cross-section. The cooling band 8 is made of flexible material, and its two ends are fixedly connected to and communicate with the cooling pipes 9 on both sides. The flexible material allows the cooling band 8 to completely conform to the inner wall of the wave-shaped cooling hole 21, preventing gaps between the cooling band 8 and the hole wall due to the irregular cross-section of the cooling hole 21, thus maximizing the contact area.

[0038] Please see Figures 1-7 During the operation of the solid-state battery pack 1, cooling can be achieved through the cooling strip 8 installed in the cooling hole 21 of the pressure plate 2. The cooling strip 8 is installed on the cooling pipe 9 in a way that communicates with the tensioning strip 4. The cooling pipe 9 is connected to the cooling strip 8 and delivers the internal coolant to the cooling strip 8 to form a circulation. The heat is carried away by the circulation of the coolant to reduce the temperature of the cooling strip 8 itself. After the temperature is reduced, the cooling strip 8 exchanges heat with the pressure plate 2, thereby cooling multiple pressure plates 2. At the same time, when the cross-sectional shape of the cooling hole 21 is designed to be periodically wavy, the contact area between the cooling strip 8 and the pressure plate 2 in the cooling hole 21 can be further expanded. The increase in contact area can accelerate the heat exchange rate and greatly improve the cooling efficiency.

[0039] 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. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressurizable and rechargeable solid-state battery pack, comprising a solid-state battery pack (1) and pressure plates (2) pressed onto the upper and lower surfaces of the solid-state battery pack (1), characterized in that: Two or more pressure plates (2) are arranged along the length of the solid-state battery pack (1). The number of pressure plates (2) is set according to the actual number of solid-state batteries inside the solid-state battery pack (1). The pressure plates (2) on the upper and lower surfaces of the solid-state battery pack (1) are connected to each other by long screws (3). Two or more pressure plates (2) are fitted with two or more waist-shaped tightening straps (4) along their arrangement direction. Both ends of the solid-state battery pack (1) are provided with expansion rods (5). The two ends of the tightening straps (4) are respectively fitted onto the expansion rods (5) at both ends. The expansion rods (5) stretch the waist-shaped tightening straps (4) to generate tension so that the upper and lower straight sections are respectively pressed onto the pressure plates (2) on the upper and lower surfaces of the solid-state battery pack (1). The pressing pressure of the tightening straps (4) on the pressure plates (2) is changed by adjusting the distance between the two sets of expansion rods (5). The tightening band (4) consists of an airbag strip (41) filled with gas and two or more sets of drawstrings (43). The airbag strip (41) and the drawstrings (43) are both in a closed loop shape and are fitted onto the pressure plate (2) along the length of the solid-state battery pack (1). The two ends of the airbag strip (41) are fitted onto the expansion rod (5). The drawstrings (43) are fitted onto the airbag strip (41) and the airbag strip (41) supports the drawstrings (43). The two or more sets of drawstrings (43) extend along the width of the solid-state battery pack (1). The airbag strips (41) are arranged in an equidistant array in the direction of degrees, and the inner ring surface of the airbag strips (41) is attached to the pressure plate (2). When the solid-state battery pack (1) expands and squeezes the pressure plate (2) to deform, the pressure plate (2) squeezes the airbag strips (41), causing the gas inside the airbag strips (41) between the pressure plate (2) and the rope (43) to be discharged, so that the inner walls of the airbag strips (41) in the area where the gas is discharged come into contact with each other, thereby causing the rope (43) to indirectly apply locally enhanced pressure to the pressure plate (2) through the airbag strips (41).

2. The pressurizable rechargeable solid-state battery pack according to claim 1, characterized in that: Each set of expansion rods (5) is equipped with support rods (6) at both ends. A piston module (7) is provided between the support rod (6) and the long screw (3) to drive the support rod (6) to move in a telescoping motion along its axis. The piston module (7) is fixedly connected to the long screw (3). When the piston modules (7) on both sides drive the support rod (6) to extend, the tension band (4) is increased by the tension force, causing its upper and lower straight sections to move closer to each other. When the piston module (7) drives the support rod (6) to contract, the tension band (4) is reduced by the relaxation force, causing its upper and lower straight sections to move away from each other.

3. The pressurizable rechargeable solid-state battery pack according to claim 1, characterized in that: The long screw (3) is provided with bolts (31) and presses the pressure plate (2) onto the surface of the solid-state battery pack (1); the width of the pressure plate (2) is greater than the width of the solid-state battery pack (1), and the long screw (3) is installed on both sides of the pressure plate (2).

4. A pressurizable and rechargeable solid-state battery pack according to claim 1, characterized in that: The closed-loop circumference of the rope (43) is greater than that of the airbag strip (41), and the rope (43) and the airbag strip (41) are fixed together by a strap; the airbag strip (41) is provided with an inflation hole (42), and an air pump is connected to the inflation hole (42), and a pressure sensor for monitoring the internal pressure of the airbag strip (41) is provided on the air pump.

5. A pressurizable and rechargeable solid-state battery pack according to claim 1, characterized in that: The airbag strip (41) is made of a flexible, friction-resistant material, and a friction coating is provided at the junction of the airbag strip (41) and the expansion rod (5).

6. A pressurizable rechargeable solid-state battery pack according to claim 1, characterized in that: The pressure plate (2) has square cooling holes (21). A cooling strip (8) with coolant flowing inside is provided in the cooling hole (21). The cooling strip (8) passes through the cooling holes (21) on two or more pressure plates (2) in sequence along the length of the solid-state battery pack (1). The cooling strip (8) is waist-shaped and has cooling pipes (9) at both ends. The cooling pipes (9) have circulating coolant flowing inside. The cooling pipes (9) are connected to a cooling module, and the two ends of the cooling pipes (9) are fixedly connected to the piston module (7).

7. A pressurizable and rechargeable solid-state battery pack according to claim 1, characterized in that: The expansion rod (5) is provided with a limiting ring (51) to restrict the axial movement of the tightening band (4).

8. A pressurizable and rechargeable solid-state battery pack according to claim 1, characterized in that: The pressure plate (2) is provided with a limiting structure (22) to restrict the displacement of the solid-state battery pack (1), and two or more guide plates (10) are connected between two or more pressure plates (2) located on the same side of the solid-state battery pack (1). The guide plates (10) make the working surfaces of two or more pressure plates (2) on the same side of the solid-state battery pack (1) coplanar. The guide plates (10) and the pressure plates (2) are fixedly connected by the long screw (3).

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