High-pressure all-solid-state battery and pressurizing device

Abstract

The utility model belongs to the technical field of batteries, and discloses a high-pressure all-solid-state battery and a pressurizing device, and the high-pressure all-solid-state battery comprises a battery shell, a battery cell assembly and a limiting device, the battery cell assembly and the limiting device are arranged in the battery shell; the battery cell assembly comprises an electrolyte layer, a positive plate and a negative plate, the electrolyte layer is arranged between the limiting device and the negative plate, an accommodating space is formed in the limiting device, and the positive plate is arranged in the accommodating space and is in contact with the electrolyte layer. The positive plate is arranged in the accommodating space, so that the displacement space of a positive plate material in the radial direction is limited, the whole positive plate is subjected to relatively balanced pressure under high pressure, the uniformity and densification of the whole positive plate are further promoted, the conduction of electrons and ions in the positive plate is facilitated, the short-circuit risk in the battery is reduced, and the service life of the battery is prolonged. The service life of the battery is prolonged, and the battery performance is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a high pressure full solid state battery and pressurizing device. BACKGROUND

[0002] In prior art, oxide, sulfide, halide and other solid state batteries need to be charged and discharged above 100MPa in development stage, and a die battery is usually adopted, which bears pressure by means of high-strength ceramic cavity, and the price is 1000-3000 yuan, assembly is complex and easy to leak, and glove box operation is often needed, while button cell is commonly used in liquid battery development, which is low in cost, good in sealing and does not need glove box, but direct use in solid state battery above 100MPa has many deficiencies, and currently there is no full solid state button cell working under such pressure reported, and the battery cell of conventional button cell is opposite to the positive plate and the negative plate at both ends of the electrolyte layer in the stacking structure, and this layout exposes serious problems under high pressure (above 100MPa), when pressure is applied, the positive plate on the upper side is pressed, and the material thereof is subjected to great pressure in all directions, and the positive plate is extended in the radial direction, and the extension is not uniform, so that the central region of the positive plate is densified more than the edge region, which seriously affects the battery performance, on one hand, uneven densification destroys the microstructure of the positive plate, hinders the conduction of electrons and ions, and reduces the charge and discharge efficiency, and on the other hand, the difference in densification between the center and the edge may cause local stress concentration, and after long-term use or multiple charge and discharge cycles, internal short circuit of the battery is easily caused, so that the battery is invalid and even safety hazards are caused. SUMMARY

[0003] The utility model discloses a high pressure full solid state battery and pressurizing device, and aims at solving the technical problem that the positive plate of the battery cell of the conventional button cell is randomly stretched to all directions when high pressure is applied, and the densification degree of the positive plate is uneven.

[0004] In order to realize the above-mentioned utility model purposes, the utility model provides a high pressure full solid state battery, which comprises a battery shell, a cell assembly and a limiting device.

[0005] The cell assembly and the limiting device are arranged in the battery shell.

[0006] The cell assembly comprises an electrolyte layer, a positive plate and a negative plate, the electrolyte layer is arranged between the limiting device and the negative plate, a containing space is arranged in the limiting device, and the positive plate is arranged in the containing space and in contact with the electrolyte layer.

[0007] Further, the battery further comprises a first buffer and a second buffer arranged in the battery shell, and the first buffer and the second buffer are arranged correspondingly, the first buffer is arranged at one end of the positive plate away from the electrolyte layer, and the second buffer is arranged at one end of the negative plate away from the electrolyte layer.

[0008] Further, the thickness of the limiting device is 30%-90% of the thickness of the positive plate.

[0009] Further, the diameter of the positive plate is d≤0.024D0 2 +0.83, and D1>D2>D0>D3>d, 0.1>D3-d>0, wherein d is the diameter of the positive plate, D0 is the diameter of the pressing column in the pressing device for pressing the high-pressure full solid-state battery, D1 is the diameter of the electrolyte layer, D2 is the diameter of the negative plate, D3 is the inner diameter of the limiting device, and the units of the diameters and the inner diameter are mm.

[0010] The utility model further provides a kind of pressing device, for pressing and pressure maintaining the battery described in any one of the above embodiments, including pressing assembly, shell and support assembly, the support assembly is detachably connected on the shell, and the support assembly is used to place the high-pressure full solid-state battery, and the pressing assembly is movably connected on the shell, and corresponds with the support assembly, and the pressing assembly is used to apply force to the battery.

[0011] Further, the support assembly includes a base and a support column, the support column is arranged on the base, and the support column is threadedly connected in the shell.

[0012] Further, one end of the support column away from the base is provided with a groove of specified depth, and the battery is placed in the groove.

[0013] Further, the pressing assembly includes a top plate and a pressing column, the pressing column is threadedly connected on the top plate, and one end of the pressing column away from the top plate is slidably connected on the shell.

[0014] Further, the pressing column includes a first pressing part and a second pressing part, the first pressing part is connected with the top plate through the shell, the second pressing part is connected at one end of the first pressing part away from the top plate, and the second pressing part is located in the shell.

[0015] Further, the pressing device further includes an insulating washer located in the shell, the insulating washer is arranged at one end of the second pressing part close to the first pressing part, and the insulating washer is in contact with the shell.

[0016] Further, the diameter of the second pressing part gradually decreases from the first pressing part to the support assembly.

[0017] Advantages:

[0018] The utility model discloses a high pressure full solid state battery, including battery shell, electric core subassembly and limiting device, electric core subassembly with the limiting device sets up in the battery shell, electric core subassembly includes electrolyte layer, positive plate and negative plate, the electrolyte layer sets up between the limiting device with the negative plate, the accommodating space is set up in the limiting device, and the positive plate sets up in the accommodating space with the electrolyte layer contact. Therefore, by setting up the positive plate in the accommodating space, make the limiting device closely surround the periphery of positive plate, under high pressure environment, the limiting device as physical barrier restricts the displacement space of positive plate material in the radial direction, limits its radial extension, and the limiting device helps the pressure to distribute more evenly on the positive plate, so that the whole positive plate receives relatively balanced pressure under high pressure, and then promotes the uniform densification of the whole positive plate, and the uniformly dense positive plate is favorable to the conduction of electrons and ions in its interior, thereby improving the charge and discharge efficiency, capacity retention rate and other electrochemical performance indexes of the battery, avoiding the relative displacement or poor contact problem between the positive plate and other components (such as negative plate, electrolyte layer) caused by excessive extension of the positive plate, reducing the internal short circuit risk of the battery, prolonging the service life of the battery, so that the battery can still maintain good performance after multiple charge and discharge cycles. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is whole structure schematic diagram of high pressure full solid state battery of the utility model embodiment;

[0020] Figure 2 It is limiting device and positive plate schematic diagram of the utility model embodiment;

[0021] Figure 3 It is whole structure schematic diagram of the utility model embodiment's pressurizing device;

[0022] Figure 4 It is the A-A place sectional view of the utility model embodiment Figure 3 .

[0023] Among them:

[0024] 100, high pressure full solid state battery;

[0025] 1, battery shell;2, electric core subassembly;3, first buffer;4, second buffer;

[0026] 10, negative shell;11, positive shell;

[0027] 20, electrolyte layer; 21, positive electrode sheet; 22, negative electrode sheet; 23, limiting device; 24, containing space;

[0028] 200, pressurizing device;

[0029] 5, pressurizing assembly; 6, shell; 7, supporting assembly; 8, insulating washer;

[0030] 70, base; 71, supporting column; 72, groove; 73, negative banana plug interface;

[0031] 50, top plate; 51, pressurizing column; 52, positive banana plug interface;

[0032] 510, first pressurizing part; 511, second pressurizing part.

[0033] The realization, functional features and advantages of the utility model will be further described with reference to the drawings in combination with embodiments. DETAILED DESCRIPTION

[0034] It should be understood that the specific embodiments described herein are merely intended to explain the utility model, and are not intended to limit the utility model.

[0035] In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is the orientation or position relationship shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0036] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, term "installation", "link", "connection" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, can be direct connection, also can pass through intermediate medium indirectly connect, can be two element inside's intercommunication or two element's mutual action relation.For ordinary skilled person in the art, can understand the concrete meaning of above-mentioned term in the utility model according to specific circumstances.

[0037] In the utility model, unless another explicit provision and limitation, first feature is "on" or "under" second feature "on" or "under" can include first and second features direct contact, also can include first and second features not direct contact but contact through additional feature between them.Moreover, first feature is "on", "above" and "on" second feature includes first feature is directly above and obliquely above second feature, or just indicates that the horizontal height of first feature is higher than second feature.First feature is "under", "below" and "under" second feature includes first feature is directly below and obliquely below second feature, or just indicates that the horizontal height of first feature is less than second feature.

[0038] Referring to Figures 1-2 The embodiment provides a high-pressure all-solid-state battery 100, including a battery shell 1, an electric core assembly 2 and a limiting device 23.

[0039] The electric core assembly 2 and the limiting device 23 are arranged in the battery shell 1.

[0040] The electric core assembly 2 includes an electrolyte layer 20, a positive plate 21 and a negative plate 22, the electrolyte layer 20 is arranged between the limiting device 23 and the negative plate 22, a containing space 24 is arranged in the limiting device 23, and the positive plate 21 is arranged in the containing space 24 and contacts the electrolyte layer 20.

[0041] In the above embodiment, the high-pressure all-solid-state battery 100 includes the cell assembly 2 and the limiting device 23, the battery 100 is a high-pressure all-solid-state battery button cell, which is circular in shape, wherein the cell assembly 2 and the limiting device 23 are arranged in the battery shell 1, and the shapes of the cell assembly 2 and the limiting device 23 are both circular, the battery shell 1 is a shell 6 structure that accommodates and protects the internal components of the battery 100, provides mechanical support and protection for the high-pressure all-solid-state battery 100, prevents external factors from causing damage to the inside of the battery 100, and the high-pressure all-solid-state battery 100 is referred to as the battery 100 hereinafter; the cell assembly 2 constitutes the electrochemical core part of the battery 100, including the electrolyte layer 20, the positive electrode sheet 21 and the negative electrode sheet 22 and other key components, the electrolyte layer 20 serves as an ion transmission medium, allowing lithium ions to move back and forth between the positive electrode sheet 21 and the negative electrode sheet 22, maintaining the charging and discharging process of the battery 100; the positive electrode sheet 21 releases lithium ions when the battery 100 is charged, and receives lithium ions when it is discharged, which is an important part of the battery 100 to generate electric energy, and its material properties affect the voltage, capacity and other performance of the battery 100; the negative electrode sheet 22 corresponds to the positive electrode sheet 21, stores lithium ions when charging, and provides lithium ions to the positive electrode sheet 21 when discharging, and works with the positive electrode sheet 21 to realize the charging and discharging cycle of the battery 100. The electrolyte layer 20 is arranged between the limiting device 23 and the negative electrode sheet 22, so that the limiting device 23 and the negative electrode sheet 22 are located on the two sides of the electrolyte layer 20 respectively, and the limiting device 23 and the negative electrode sheet 22 are in contact with the electrolyte layer 20 respectively, and a containing space 24 is arranged in the limiting device 23, the containing space 24 is a circular through hole structure, the positive electrode sheet 21 is arranged in the containing space 24, and the positive electrode sheet 21 is in contact with the electrolyte layer 20, the limiting device 23, the negative electrode sheet 22 and the negative electrode sheet 22 have the same diameter, the positive electrode sheet 21 is located at the center of the containing space 24 of the limiting device 23, so that the centers of the electrolyte layer 20, the limiting device 23, the positive electrode sheet 21 and the negative electrode sheet 22 are located on the same axis, the limiting device 23 is a relatively thin steel sheet, the thickness of the limiting device 23 is 30% to 90% of the thickness of the positive electrode sheet 21, and the main function of the limiting device 23 is to limit the radial extension of the positive electrode sheet 21 when it is subjected to pressure, to ensure that the positive electrode sheet 21 maintains a stable shape and structure under high-pressure environment, thereby promoting the overall uniform densification of the positive electrode sheet 21.

[0042] When the battery 100 is assembled, first, the negative plate 22 is placed at one end of the electrolyte layer 20, ensuring close fitting, then the positive plate 21 is placed at the other end of the electrolyte layer 20, opposite the negative plate 22, then the limiting device 23 is accurately fitted around the periphery of the positive plate 21, so that the limiting device 23 is in good contact with the electrolyte layer 20, and the positive plate 21 is located at the center position of the limiting device 23, while meeting the diameter relationship requirements of each component, then the assembled cell component 2 is placed in the battery shell 1, ensuring the stable position of each component, by setting the positive plate 21 in the containing space 24, the limiting device 23 is tightly surrounded around the periphery of the positive plate 21, in a high pressure environment, the limiting device 23 limits the displacement space of the positive plate 21 material in the radial direction as a physical barrier, limiting its radial extension, the limiting device 23 helps to make the pressure on the positive plate 21 more evenly distributed, so that the entire positive plate 21 is subjected to relatively balanced pressure under high pressure, thereby promoting the uniform densification of the positive plate 21 as a whole, while the uniformly dense positive plate 21 is conducive to the conduction of electrons and ions inside it, thereby improving the electrochemical performance indicators such as charge-discharge efficiency and capacity retention rate of the battery 100, avoiding the problem of relative displacement or poor contact between the positive plate 21 and other components (such as the negative plate 22 and the electrolyte layer 20) caused by excessive extension of the positive plate 21, reducing the risk of internal short circuit of the battery 100, prolonging the service life of the battery 100, and enabling the battery 100 to maintain good performance after multiple charge-discharge cycles.

[0043] Referring to Figures 1-2 In an embodiment, the battery 100 further comprises a first buffer 3 and a second buffer 4 arranged in the battery shell 1, and the first buffer 3 and the second buffer 4 are arranged correspondingly, the first buffer 3 is arranged at one end of the positive plate 21 away from the electrolyte layer 20, and the second buffer 4 is arranged at one end of the negative plate 22 away from the electrolyte layer 20.

[0044] In the above embodiment, the battery 100 further comprises a first buffer 3 and a second buffer 4, and the first buffer 3 and the second buffer 4 are arranged in the battery shell 1, the battery shell 1 comprises a negative shell 10 and a positive shell 11, both the first buffer 3 and the second buffer 4 are preferably made of steel sheet, which plays a key role in buffering and supporting in the battery 100, has good strength and toughness, can withstand a certain pressure without easy deformation, and also has good electrical conductivity, which can assist the current conduction inside the battery 100; the negative shell 10 and the positive shell 11 jointly constitute the battery shell 1, which provides physical protection for the internal components of the battery 100, prevents the erosion and damage of the external environment to the inside of the battery 100; wherein the diameter of the negative shell 10 is smaller than that of the positive shell 11, and the two cooperate to form a closed space to accommodate components such as the cell assembly 2, and the sealing of the battery 100 is ensured by a specific connection method (such as welding, clamping, edge rolling, etc.). In the structure of the battery 100, the first buffer 3 is located at one end of the positive plate 21 away from the electrolyte layer 20, in contact with the negative shell 10; the second buffer 4 is located at one end of the negative plate 22 away from the electrolyte layer 20, in contact with the positive shell 11, so that when the battery 100 is subjected to external pressure or internal chemical reaction to produce volume change, the buffer can effectively disperse the pressure and protect the internal components of the battery 100 from damage. In addition, the positive plate 21 (in the same plane as the limiting device 23), the electrolyte layer 20 and the negative plate 22 in the cell assembly 2 are arranged in the space surrounded by the positive shell 11 and the negative shell 10 in turn, and the components are tightly matched to form a complete battery 100 system. From the overall structure, from top to bottom, it is the negative shell 10, the first buffer 3, the positive plate 21 (and the limiting device 23), the electrolyte layer 20, the second buffer 4, and the positive shell 11. The positional relationship between the components is clear and orderly, which jointly ensures the normal operation and performance stability of the battery 100.

[0045] When the battery 100 is subjected to external pressure (such as pressure operation during assembly or extrusion in actual use), the buffer can effectively absorb and disperse the pressure, avoid damage to the internal components of the battery 100 caused by concentrated pressure, and at the same time, the buffer made of steel sheet helps to maintain the structural stability of the battery 100, ensures that the relative positions between the components remain unchanged, thereby ensuring the stability of the ion and electron transmission channels of the battery 100 during charging and discharging, improving the safety of the battery 100, and prolonging the service life of the battery 100. The battery 100 can work stably and reliably in various complex environments, improving the overall performance and durability of the battery 100.

[0046] Further, the diameter of the positive plate 21 is defined as d, the diameter of the pressing column 51 in the pressing device 200 for pressing the battery 100 is defined as D0, the diameter of the electrolyte layer 20 is defined as D1, the diameter of the negative plate 22 is defined as D2, and the inner diameter of the limiting device 23 is defined as D3, wherein the relationship d≤0.024D0 needs to be met 2 +0.83, and D1>D2>D0>D3>d, 0.1>D3-d>0, the units of the diameters are mm, by limiting the relationship between the diameter d of the positive plate 21 and the diameter D0 of the upper pressing column 51, different upper pressing columns 51 can be replaced according to the different diameters of the positive plate 21 during the assembly and pressing of the battery 100, which can ensure that the positive plate 21 is subjected to relatively uniform pressure in the radial direction, and the appropriate size of the positive plate 21 can make the pressure uniformly dispersed on the entire surface of the positive plate 21 when the upper pressing column applies pressure, thereby avoiding the situation that the local pressure is too large or too small, promoting the uniform densification of the material of the positive plate 21, and the uniformly densified positive plate 21 is helpful to improve the conduction efficiency of electrons and ions and reduce the uneven distribution of current density caused by local structural differences, thereby improving the charge and discharge performance of the battery 100.

[0047] Referring to Figure 1 , Figures 3-4 The utility model also provides a kind of pressing device 200 for pressing and pressure maintaining the battery 100 described in any one of the above embodiments, comprising pressing assembly 5, shell 6 and support assembly 7, the support assembly 7 is detachably connected on the shell 6, the support assembly 7 is used to place the battery 100, the pressing assembly 5 is movably connected on the shell 6, and it corresponds with the support assembly 7, and the pressing assembly 5 is used to apply force for the battery 100.

[0048] In the above embodiment, the pressing device 200 is used for pressing and pressure maintaining the battery 100, that is, the pressing device 200 is a device specially designed for the battery 100 to realize the functions of pressing and pressure maintaining, which comprises pressing assembly 5, shell 6 and support assembly 7. The pressing assembly 5 is mainly responsible for providing pressure for the battery 100. The shell 6 provides an external protective structure for the entire pressing device 200 and is also the installation basis for other components, ensuring that the internal components work in a relatively stable and closed environment. The support assembly 7 is used to place the battery 100. In the pressing device 200, the shell 6 serves as the overall frame, the support assembly 7 is installed inside and below the shell 6 to provide a stable placement position for the battery 100, and the pressing assembly 5 is located above the shell 6 and opposite to the support assembly 7. Through the movable connection, the pressing assembly 5 can accurately apply pressure to the battery 100 placed on the support assembly 7. The components cooperate with each other to realize the functions of pressing and pressure maintaining the battery 100, ensuring that the battery 100 reaches the required densification pressure without damaging the sealing structure of the battery 100.

[0049] In use, the preparation stage places the battery 100 on the support assembly 7, ensures that the battery 100 is placed stably and accurately in position, and then the support assembly 7 is installed on the shell 6 by screw connection, so that it is fixed inside the shell 6. When pressing, the top plate 50 of the pressing assembly 5 is subjected to a downward force by an external power source (such as a press machine, etc.), the top plate 50 drives the pressing column 51 to move downward, the pressing column 51 slides in the shell 6 and gradually approaches the battery 100, and the pressure is uniformly applied to the battery 100. During the pressing process, the pressure is adjusted as needed to achieve the required densification pressure (500-800 MPa) of the battery 100. In the pressure maintaining stage, when the target pressure is reached, the pressure of the pressing assembly 5 is kept stable, so that the battery 100 can be kept at a set pressure for a period of time to realize the pressure maintaining process. During this period, the state of the equipment and the battery 100 is closely observed to ensure that the battery 100 does not leak or have other abnormal conditions under high pressure. After the operation is completed, the pressure is slowly released, and finally the support assembly 7 is disassembled and the treated battery 100 is taken out. Through the device, a densification pressure of up to 500-800 MPa can be achieved, effectively promoting the densification of the internal pole piece of the battery 100, improving the energy density and electrochemical performance of the battery 100. Secondly, the battery 100 will not leak under a pressure of 800 MPa, ensuring the safety and stability of the battery 100, so that the battery 100 can still work normally under high pressure. In addition, accurate pressing and pressure maintaining operations can be realized, which helps to optimize the internal structure of the battery 100, reduce the interface impedance, and prolong the cycle life of the battery 100, providing strong support for the high performance of the battery 100 in actual application, and improving the overall quality and reliability of the battery 100.

[0050] Referring to Figure 1 , Figures 3-4 In an embodiment, the support assembly 7 includes a base 70 and a support column 71, the support column 71 is arranged on the base 70, and the support column 71 is screw-connected in the shell 6.

[0051] In the above embodiment, the support assembly 7 includes a base 70 and a support column 71, the base 70 serves as the base part of the support assembly 7, providing a stable support platform for the entire structure, ensuring that the support assembly 7 will not sway or shift during the entire pressurization process, wherein a positive banana plug interface 52 is reserved on the top plate 50, and a negative banana plug interface 73 is reserved on the base 70, which facilitates the charging and discharging of the battery during the pressure maintaining process and other electrochemical test connections; the support column 71 is vertically installed on the base 70 and is a key component connecting the base 70 and the shell 6 and carrying the battery 100, which is connected in the shell 6 through threads, this connection method is not only convenient for installation and disassembly, but also can provide reliable fixation in the vertical direction, ensuring that the support column 71 will not loosen or shift when bearing pressure, in addition, the groove 72 provided on the end of the support column 71 away from the base 70 has a depth less than or equal to the height of the positive shell 11, which is specially used to accommodate the battery 100, so that the battery 100 can be accurately positioned and remain stable when under pressure. In this structure, the base 70 is located at the bottom, providing a solid foundation for the entire device, the support column 71 is firmly erected on the base 70 and connected to the shell 6 through threads, forming a stable vertical support structure, the battery 100 is placed in the groove 72 on the top of the support column 71, and the design of the depth of the groove 72 ensures that the top of the battery 100 is flush with or slightly higher than the top of the support column 71 after placement, so that the pressure can act uniformly on the battery 100 during pressurization, avoiding uneven pressure distribution due to unstable placement of the battery 100. The stable base 70 and the firm support column 71 connected by threads ensure the stability of the entire structure in a high-pressure environment, effectively preventing damage to the battery 100 or uneven pressurization caused by unstable support, and the reasonable design of the depth of the groove 72 ensures the stability of the battery 100 during placement and pressurization, so that the battery 100 will not shift or tilt when subjected to pressure from the upper pressurization assembly 5, thereby ensuring that the pressure is uniformly transmitted to all parts of the battery 100, which helps to achieve uniform densification of the battery 100.

[0052] Referring to Figure 1 , Figures 3-4 In one embodiment, the pressurization assembly 5 includes a top plate 50 and a pressurization column 51, the pressurization column 51 is threadedly connected to the top plate 50, and the end of the pressurization column 51 away from the top plate 50 is slidingly connected to the shell 6.

[0053] In the above embodiment, the pressurizing assembly 5 includes a top plate 50 and a pressurizing column 51, the top plate 50 is the top component of the pressurizing assembly 5, providing a force point for applying pressure, usually having certain strength and rigidity to withstand the force from the external pressure source and transmit it to the pressurizing column 51; the pressurizing column 51 as the key component to directly apply pressure to the battery 100, is composed of a first pressurizing part 510 and a second pressurizing part 511, and the first pressurizing part 510 and the second pressurizing part 511 are an integral piece, wherein the diameter of the pressurizing column 51 for pressurizing the battery 100 is the diameter of the first pressurizing part 510, the first pressurizing part 510 is responsible for connecting the top plate 50, and the design of penetrating the shell 6 enables the pressure applied by the top plate 50 to be effectively transmitted to the second pressurizing part 511; the second pressurizing part 511 is located inside the shell 6 and directly opposite to the battery 100, aiming to uniformly apply pressure to the battery 100, and the diameter of the second pressurizing part 511 gradually decreases from the first pressurizing part 510 to the support assembly 7. The pressurizing column 51 is threadedly connected to the top plate 50, and the end of the pressurizing column 51 away from the top plate 50 is slidingly connected to the shell 6, ensuring that the pressurizing column 51 can stably move in the vertical direction without deviation or shaking. In this pressurizing assembly 5, the top plate 50 is located at the uppermost position and is the starting force point of the entire pressurizing process, the first pressurizing part 510 of the pressurizing column 51 penetrates the shell 6 and is tightly connected with the top plate 50, conducting the pressure received by the top plate 50 to the second pressurizing part 511, and the second pressurizing part 511 corresponds to the battery 100 inside the shell 6, and its position and structure enable the pressure to be uniformly and vertically applied to the surface of the battery 100 during the pressurizing process. The threaded connection mode of the top plate 50 and the pressurizing column 51 enhances the structural stability of the assembly, enabling reliable transmission of pressure in a high-pressure environment and avoiding pressure loss or uneven pressurization due to loose connection. In addition, the sliding connection design of the pressurizing column 51 ensures the accuracy and stability of the pressure application direction, preventing uneven force on the battery 100 due to deviation of the pressurizing column 51, thereby ensuring uniform and dense internal plate pieces of the battery 100 and improving the performance of the battery 100.

[0054] Referring to Figure 1 , Figures 3-4 In an embodiment, the pressurizing device 200 further includes an insulating gasket 8 located inside the shell 6, the insulating gasket 8 is arranged at one end of the second pressurizing part 511 close to the first pressurizing part 510, and the insulating gasket 8 is in contact with the shell 6.

[0055] In the above embodiment, the pressing device 200 further comprises an insulating washer 8 located in the shell 6, which is made of insulating material and mainly functions to prevent leakage or short circuit during the conduction of electric current inside the pressing device 200. The insulating washer 8 is arranged at one end of the second pressing part 511 close to the first pressing part 510 and in contact with the shell 6, occupying a specific position in the accommodating cavity formed in the shell 6, thereby electrically isolating the pressing assembly 5 from the shell 6 and other components, ensuring the electrical safety of the pressing process. The accommodating cavity accommodates the insulating washer 8, the second pressing part 511 and the support column 71 and the like, so that they can work cooperatively in a relatively closed and stable space. The diameter of the second pressing part 511 gradually decreases from the first pressing part 510 to the support assembly 7. The connecting part close to the first pressing part 510 is trapezoidal, which helps to better disperse stress when transmitting pressure and avoid stress concentration. The end close to the support column 71 and in contact with the battery 100 is cylindrical and has the same diameter as the first pressing part 510, which can uniformly transmit pressure to the battery 100. The diameter of the end of the second pressing part 511 away from the first pressing part 510 is less than or equal to the diameter of the first buffer 3 in the battery 100, which ensures that other components inside the battery 100 will not be unnecessarily pressed or disturbed during the pressing process. In the pressing device 200, the insulating washer 8 is located between the second pressing part 511 and the shell 6, and the second pressing part 511 moves in the accommodating cavity under the drive of the first pressing part 510 to transmit pressure to the battery 100. The insulating washer 8 improves the safety of the pressing device 200, effectively prevents equipment damage, battery 100 performance degradation or even safety accidents caused by electrical short circuit, ensures the safety of the operator and the normal operation of the battery 100 and the pressing device 200, and the special shape of the second pressing part 511 brings many benefits. The trapezoidal connecting part helps to uniformly disperse the pressure from the first pressing part 510, reduces stress concentration, improves the structural reliability and service life of the pressing column 51, and the cylindrical pressing end can ensure that the pressure is uniformly applied to the surface of the battery 100, promoting the uniform densification of the internal pole pieces of the battery 100.

[0056] The above description is only preferred embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process conversion, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A high pressure all-solid-state battery, characterized by, The battery comprises a battery shell, an electric core assembly and a limiting device; The electric core assembly and the limiting device are arranged in the battery shell; The electric core assembly comprises an electrolyte layer, a positive electrode sheet and a negative electrode sheet, the electrolyte layer is arranged between the limiting device and the negative electrode sheet, the limiting device is provided with a containing space, and the positive electrode sheet is arranged in the containing space and in contact with the electrolyte layer.

2. The high pressure all-solid-state battery according to claim 1, characterized by, The battery further comprises a first buffer and a second buffer arranged in the battery shell, and the first buffer and the second buffer are arranged correspondingly, the first buffer is arranged at one end of the positive electrode sheet away from the electrolyte layer, and the second buffer is arranged at one end of the negative electrode sheet away from the electrolyte layer.

3. The high pressure all-solid-state battery of claim 1, wherein, The thickness of the limiting device is 30% to 90% of the thickness of the positive electrode sheet.

4. The high pressure all-solid-state battery of claim 1, wherein, The diameter of the positive electrode sheet is d ≤ 0.024D0 2 +0.83, and D1 > D2 > D0 > D3 > d, 0.1 > D3 - d > 0, where d is the diameter of the positive electrode sheet, D0 is the diameter of a pressing column in a pressing device for pressing the high-pressure all-solid-state battery, D1 is the diameter of the electrolyte layer, D2 is the diameter of the negative electrode sheet, and D3 is the inner diameter of the limiting device, each diameter and inner diameter being in mm.

5. A pressurizing device for pressurizing and pressure-maintaining the high-pressure all-solid-state battery according to any one of claims 1 to 4, characterized by The high-pressure full-solid-state battery comprises a pressing assembly, a shell and a supporting assembly, the supporting assembly is detachably connected to the shell, the supporting assembly is used for placing the high-pressure full-solid-state battery, the pressing assembly is movably connected to the shell and corresponds to the supporting assembly, and the pressing assembly is used for applying force to the battery.

6. The pressurizing device according to claim 5, characterized by The supporting assembly comprises a base and a supporting column, the supporting column is arranged on the base, and the supporting column is screw-connected to the shell.

7. The pressurizing device according to claim 6, characterized by One end of the supporting column away from the base is provided with a groove with a specified depth, and the battery is placed in the groove.

8. The pressurizing device according to claim 5, characterized by The pressing assembly comprises a top plate and a pressing column, the pressing column is screw-connected to the top plate, and one end of the pressing column away from the top plate is slidably connected to the shell.

9. The pressurizing device according to claim 8, characterized by The pressing column comprises a first pressing part and a second pressing part, the first pressing part is connected to the top plate through the shell, the second pressing part is connected to one end of the first pressing part away from the top plate, and the second pressing part is arranged in the shell.

10. The pressurizing device according to claim 9, characterized by The pressing device further comprises an insulating gasket arranged in the shell, the insulating gasket is arranged at one end of the second pressing part close to the first pressing part, and the insulating gasket is in contact with the shell.

11. The pressurizing device according to claim 9, characterized by The diameter of the second pressing part gradually decreases from the first pressing part to the supporting assembly.

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