Isostatic pressing device and battery production equipment

Abstract

The utility model relates to an isostatic pressing device and battery production equipment, and the isostatic pressing device comprises a housing which is provided with a containing cavity; the clamping assembly is arranged in the containing cavity and comprises at least two clamping plates, each clamping plate comprises a plate body and an elastic cushion block, and the plate bodies are arranged at intervals in the first direction; an overflowing opening is formed in each plate body in a penetrating mode in the first direction; in the first direction, the elastic cushion blocks are arranged on the plate body in a protruding mode towards the corresponding clamping spaces. In the first direction, the projection of the electrode assembly falls into the projection range of the overflowing opening, and the projection of the overflowing opening falls into the projection range of the film layer; the clamping space communicates with the containing cavity in the first direction, the second direction and the third direction. According to the invention, the pressure medium can uniformly flow into the clamping space, so that the whole single battery is pressed consistently and the pressure is higher, and the densification consistency and the densification degree are improved; in addition, the problem of appearance damage or local stress concentration of the battery cells can be reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to an isostatic pressing device and battery production equipment. Background Technology

[0002] During the production process of solid-state batteries, the individual cells need to undergo isostatic pressing to ensure close contact between the electrodes and the solid electrolyte, thereby achieving the densification of the solid-state battery.

[0003] However, in the current isostatic pressing process for densifying battery cells, the pressure medium is difficult to evenly cover the surface of the battery cells, resulting in uneven pressure, which affects the densification effect and can easily damage the battery cells, thus affecting their performance. Utility Model Content

[0004] Therefore, it is necessary to provide an isostatic pressing device and battery production equipment to address the problem that the pressure medium is difficult to uniformly cover the surface of the battery cell during the densification process of the current isostatic pressing device, which leads to uneven pressure, affects the densification effect, and easily damages the battery cell, affecting its performance.

[0005] In a first aspect, this application provides an isostatic pressing device for isostatically pressing battery cells. The isostatic pressing device includes a housing and a clamping assembly. The housing has a receiving cavity for accommodating a pressure medium. The clamping assembly is disposed within the receiving cavity and includes at least two clamping plates. Each clamping plate includes a plate body and elastic pads. Each plate body is spaced apart along a first direction to form a clamping space for fixing the battery cell between every two adjacent plate bodies. Each plate body has a through-hole communicating between the clamping space and the receiving cavity along the first direction. Each plate body is provided with a plurality of elastic pads, which are spaced apart around the outer periphery of the corresponding through-hole. Along the first direction, each elastic pad protrudes from the plate body toward the corresponding clamping space.

[0006] The battery cell includes an electrode assembly and a film layer covering the outer periphery of the electrode assembly; in a first direction, the projection of the electrode assembly falls within the projection range of the flow port, and the projection of the flow port falls within the projection range of the film layer.

[0007] The clamping space is connected to the receiving cavity along the first direction, the second direction and the third direction respectively; the first direction, the second direction and the third direction are perpendicular to each other.

[0008] With the above structure, when a battery cell is placed in the clamping space, since the clamping space is connected to the receiving cavity along the first, second, and third directions, the pressure medium in the receiving cavity can flow into the clamping space evenly and make full contact with all surfaces of the battery cell. This results in uniform and greater pressure on the entire battery cell, improving the consistency and density of the densification process. Furthermore, because the contact area between the clamping assembly and the battery cell is smaller, it reduces the risk of surface damage or localized stress concentration caused by physical contact, effectively improving the performance of the battery cell.

[0009] By incorporating elastic pads, the friction between the pads and the solid-state battery cells can be increased, resulting in a more stable clamping of the solid-state battery cells. Furthermore, the elastic pads are spaced apart around the outer periphery of the corresponding flow port, achieving the dual function of securely clamping the solid-state battery cells and providing a smooth channel for the flow of pressure media.

[0010] Furthermore, by arranging the clamping plates at intervals along the first direction, the clamping space between each pair of adjacent clamping plates can communicate with the receiving cavity along the second and third directions. Moreover, the flow outlets on each clamping plate communicate with the receiving cavity along the first direction, allowing the pressure medium within the receiving cavity to flow more evenly into the clamping space, thus improving the consistency and density of the densification process. Additionally, the U-shaped structure of each clamping plate reduces the contact area with the solid-state battery cells, thereby minimizing surface damage or localized stress concentration in the battery cells caused by physical contact.

[0011] Furthermore, the above structure not only enables the pressure medium inside the cavity to make more uniform contact with the electrode components in the battery cell, improving the consistency and density of densification, but also allows the elastic pads to apply a certain tension to the outer membrane layer, effectively reducing the probability of bending deformation of the solid-state battery cell due to uneven shrinkage of different materials during the densification shrinkage process, thus effectively protecting the appearance of the solid-state battery cell.

[0012] In some embodiments, each elastic pad protrudes from the corresponding plate body along a first direction with a thickness of not less than 25 μm.

[0013] By setting the thickness of the elastic pads within the aforementioned range, the size of the gaps formed between adjacent elastic pads can be effectively increased, thereby allowing the pressure medium in the receiving cavity to enter the clamping space more smoothly and evenly and to contact the surface of the solid-state battery cell, thus improving the consistency and density of densification.

[0014] In some embodiments, each elastic pad is made of a high-temperature resistant material. Therefore, making the elastic pads of a high-temperature resistant material can make the elastic pads more stable within the receiving cavity.

[0015] In some embodiments, the heat resistance temperature of each elastic pad is not lower than 120°C. This makes the elastic pads more stable in the pressure medium, enabling them to smoothly and stably clamp the solid-state battery cells and improve stability during the isostatic pressing process.

[0016] In some embodiments, the material of each plate body is a corrosion-resistant metal. This effectively improves the strength and corrosion resistance of the plate body, making the clamping assembly more stable in clamping the solid-state battery cells within the receiving cavity.

[0017] In some embodiments, the clamping assembly further includes a plurality of connectors, each connector being connected between the clamps along a first direction, and all connectors being spaced apart circumferentially along the flow port.

[0018] Therefore, by setting up connectors, not only can the clamping stability of solid-state battery cells in the clamping space be effectively improved, but the force on each clamping plate can also be made more uniform, thus improving the densification effect.

[0019] In some embodiments, each clamping plate has a plurality of connecting holes through it along a first direction, and the connecting holes are spaced apart circumferentially along the flow port; the clamping assembly further includes a locking member, each connecting member is inserted through a corresponding connecting hole along the first direction, and the locking member is locked to at least one end of the corresponding connecting member along the first direction.

[0020] Therefore, the above structure allows for adjustment of the spacing between each clamping plate in the first direction, and enables the clamping plates to be connected and fixed by connectors and locking components, thereby providing a more stable clamping of the solid-state battery cells within the clamping space.

[0021] Secondly, this application also provides a battery production apparatus, including the isostatic pressing device described above.

[0022] In the aforementioned isostatic pressing device and battery production equipment, when a battery cell is placed in the clamping space, the clamping space is connected to the receiving cavity along the first, second, and third directions, allowing the pressure medium in the receiving cavity to flow into the clamping space evenly and make full contact with each surface of the battery cell. This results in the battery cell being subjected to uniform and greater pressure, thereby improving the consistency and density of densification. Furthermore, because the contact area between the clamping components and the battery cell is smaller, it can reduce the problem of appearance damage or local stress concentration of the battery cell caused by physical contact, effectively improving the performance of the battery cell. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of an isostatic pressing device according to one or more embodiments.

[0024] Figure 2This is a three-dimensional structural diagram of the clamping component in an isostatic pressing apparatus according to one or more embodiments.

[0025] Figure 3 This is a planar structural schematic diagram of the clamping assembly in an isostatic pressing apparatus according to one or more embodiments.

[0026] Figure 4 This is a schematic diagram of the structure of a battery cell according to one or more embodiments.

[0027] Explanation of reference numerals in the attached drawings: 100, isostatic pressure device; 200, battery cell; 201, electrode assembly; 202, film layer; 10, outer shell; 20, clamping assembly; 11, receiving cavity; 21, clamping space; 22, clamping plate; 23, flow port; 24, plate body; 25, elastic pad; 26, connector; 27, locking element; a, first direction; b, second direction; c, third direction. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0030] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0034] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as other fields. With the continuous expansion of the power battery device sector, the market demand is also constantly increasing.

[0035] A battery cell is the smallest unit that makes up a battery device. Based on their structure, battery cells can be divided into liquid-state battery cells and solid-state battery cells. Solid-state battery cells include a positive electrode, a negative electrode, and a solid electrolyte. Because they do not contain liquid electrolyte, solid-state battery cells have higher reliability and a longer lifespan.

[0036] Specifically, during the cycling process of a solid-state battery cell, the transport of lithium ions needs to occur at the solid-solid interface. Therefore, the tightness between the positive and negative electrodes and the electrolyte directly affects the ionic conductivity of the solid-state battery cell. This tightness between the positive and negative electrodes and the electrolyte is also known as the densification level of the solid-state battery cell.

[0037] Therefore, isostatic pressing is commonly used to densify solid-state battery cells. During isostatic pressing, a liquid is required as the medium for pressure and heat conduction, such as water, silicone oil, or vegetable oil. To achieve good densification, higher temperatures are needed to improve the creep performance of the powder during isostatic pressing. However, water cannot be used as a heat transfer medium at temperatures exceeding 100°C. Therefore, oils become an indispensable component for pressure and heat conduction during the isostatic pressing process of solid-state battery cells.

[0038] However, in the current isostatic pressing process for densifying solid-state battery cells, the pressure medium is difficult to evenly cover the surface of the solid-state battery cells, resulting in uneven pressure, which affects the densification effect and can easily damage the solid-state battery cells, thus affecting their performance.

[0039] Based on the above considerations, to address the problem that current isostatic pressing devices often fail to uniformly cover the surface of solid-state battery cells during densification, leading to uneven pressure, affecting densification effectiveness, and potentially damaging the cells and impacting their performance, one or more embodiments of this application provide an isostatic pressing device. When a battery cell is placed in a clamping space, since the clamping space is connected to a receiving cavity along a first, second, and third direction, the pressure medium within the receiving cavity can flow uniformly into the clamping space and fully contact all surfaces of the battery cell. This results in consistent and higher pressure across the entire battery cell, improving the uniformity and density of densification. Furthermore, the smaller contact area between the clamping components and the battery cell reduces surface damage or localized stress concentration caused by physical contact, effectively improving the battery cell's performance.

[0040] Please refer to the following: Figure 1 and Figure 2One embodiment of this application provides an isostatic pressing device 100 for isostatic pressing a battery cell 200. The isostatic pressing device 100 includes a housing 10 and a clamping assembly 20. The housing 10 has a receiving cavity 11 for accommodating a pressure medium. The clamping assembly 20 is disposed within the receiving cavity 11, and its interior has a clamping space 21 for fixing the battery cell 200. The clamping space 21 communicates with the receiving cavity 11 along a first direction a, a second direction b, and a third direction c. The first direction a, the second direction b, and the third direction c are mutually perpendicular.

[0041] It should be noted that the isostatic pressing device 100 refers to a structure capable of performing isostatic pressing on solid-state battery cells. That is, the isostatic pressing device 100 is used to pressurize the solid-state battery cells, so that the positive and negative electrode plates and the solid electrolyte in the solid-state battery cells can achieve good solid-solid contact, increase the contact area between the contact interfaces, and improve the densification degree of the solid-state battery cells.

[0042] The isostatic pressing device 100 includes a housing 10 and a clamping assembly 20. The housing 10 has an internal cavity 11, which is a closed cavity for containing a pressure medium. Thus, when a solid-state battery cell is placed within the cavity 11 via the clamping assembly 20, the hot pressure medium completely encapsulates the solid-state battery cell within the closed cavity 11. The pressure medium is then pressurized hydraulically to achieve a constant temperature and pressure effect on the solid-state battery cell, causing the internal material of the solid-state battery cell to contract under pressure, thereby increasing the density of the solid-state battery cell.

[0043] The clamping assembly 20 refers to a structure capable of fixing a solid-state battery cell to place the solid-state battery cell within the receiving cavity 11. The clamping assembly 20 is hollow inside to form a clamping space 21 for fixing the solid-state battery cell.

[0044] Furthermore, the clamping space 21 is connected to the receiving cavity 11 along the first direction a, the second direction b, and the third direction c, respectively. Specifically, the receiving cavity 11 surrounds the outer periphery of the clamping space 21, and the clamping space 21 and the receiving cavity 11 are connected to each other along the first direction a, the second direction b, and the third direction c, respectively.

[0045] In this configuration, the first direction a, the second direction b, and the third direction c are all mutually perpendicular. Understandably, a solid-state battery cell typically has a rectangular structure, meaning it has two large, parallel surfaces, two parallel side surfaces, and a parallel top and bottom surface. The large surface refers to the surface with the largest area in the solid-state battery cell.

[0046] The first direction 'a' can be perpendicular to the large surface of the solid-state battery cell, the second direction 'b' can be perpendicular to the side surface of the solid-state battery cell, and the third direction 'c' can be perpendicular to the top and bottom surfaces of the solid-state battery cell.

[0047] Thus, when the solid-state battery cell is fixed in the clamping space 21, the pressure medium in the receiving cavity 11 can flow into the clamping space 21 along the first direction a, the second direction b, and the third direction c, respectively, and make uniform and sufficient contact with each surface of the solid-state battery cell, so that the solid-state battery cell is subjected to uniform pressure and greater pressure, thereby improving the uniformity and density of densification.

[0048] With the above structure, when the battery cell 200 is placed in the clamping space 21, since the clamping space 21 is connected to the receiving cavity 11 along the first direction a, the second direction b, and the third direction c, the pressure medium in the receiving cavity 11 can flow into the clamping space 21 evenly and make full contact with each surface of the battery cell 200. This ensures that the battery cell 200 is subjected to uniform and greater pressure, thereby improving the consistency and density of densification. In addition, since the contact area between the clamping assembly 20 and the battery cell 200 is smaller, it can reduce the appearance damage or local stress concentration of the battery cell 200 caused by physical contact, effectively improving the performance of the battery cell 200.

[0049] like Figure 2 and Figure 3 As shown, in some embodiments, the clamping assembly 20 includes at least two clamping plates 22, each clamping plate 22 being spaced apart along a first direction a, and a clamping space 21 being formed between each pair of adjacent clamping plates 22. Each clamping plate 22 has a through-hole 23 along the first direction a, connecting the clamping space 21 and the receiving cavity 11, thereby constructing each clamping plate 22 into a U-shaped structure.

[0050] Specifically, when the clamping plates 22 are spaced apart along the first direction a, a clamping space 21 can be formed between every two adjacent clamping plates 22. When there are two clamping plates 22, one clamping space 21 is formed, which can clamp one solid-state battery cell. When there are three clamping plates 22, two clamping spaces 21 are formed, which can clamp two solid-state battery cells. In this way, the number of clamping plates 22 can be set according to actual production needs.

[0051] Furthermore, each clamping plate 22 has an outlet 23, which extends through the plate along the first direction a, i.e., the outlet 23 extends through the plate along its thickness direction. Thus, each clamping plate 22 forms a U-shaped structure. When the solid-state battery cell is placed in the clamping space 21, the clamping plates 22 on both sides can clamp the circumferential edge of the solid-state battery cell, exposing the large surface of the cell, allowing it to directly contact the pressure medium within the receiving cavity 11.

[0052] Therefore, by arranging the clamping plates 22 at intervals along the first direction a, the clamping space 21 between each pair of adjacent clamping plates 22 can communicate with the receiving cavity 11 along the second direction b and the third direction c. Furthermore, by communicating with the receiving cavity 11 through the flow outlets 23 on each clamping plate 22 along the first direction a, the pressure medium within the receiving cavity 11 can flow more evenly into the clamping space 21, improving the consistency and density of the densification process. In addition, since each clamping plate 22 has a U-shaped structure, the contact area with the solid-state battery cell can be reduced, thereby reducing the problem of surface damage or localized stress concentration of the battery cell 200 caused by physical contact.

[0053] In some embodiments, each clamping plate 22 includes a plate body 24 and elastic pads 25. The plate bodies 24 are spaced apart along a first direction a, and each plate body 24 has a flow port 23. Each plate body 24 is provided with a plurality of elastic pads 25, and each elastic pad 25 is spaced apart around the outer periphery of its corresponding flow port 23. Along the first direction a, each elastic pad 25 protrudes from its corresponding clamping space 21 onto the plate body 24.

[0054] Specifically, each clamping plate 22 is composed of a plate body 24 and an elastic pad 25. The plate bodies 24 are spaced apart along the first direction a, and a clamping space 21 is formed between each two adjacent plate bodies 24. An outlet 23 is opened on each plate body 24.

[0055] Furthermore, each plate body 24 is provided with multiple elastic pads 25, which are spaced apart around the outer periphery of the corresponding flow port 23. In this way, while each elastic pad 25 securely clamps the solid-state battery cell, a gap can also be formed between each two adjacent elastic pads 25 to allow the flow of pressure medium. That is, the structure in which the elastic pads 25 are spaced apart around the outer periphery of the corresponding flow port 23 can achieve the dual functions of securely clamping the solid-state battery cell and reserving a smooth channel for the flow of pressure medium.

[0056] Furthermore, each elastic pad 25 protrudes from the corresponding clamping space 21 along the first direction a on the plate body 24. That is, when there are two clamping plates 22, elastic pads 25 protrude from the surfaces of the two plate bodies 24 facing each other. When there are three or more clamping plates 22, elastic pads 25 protrude from the surface of the two outermost plate bodies 24 along the first direction a facing the clamping space 21, while no elastic pads 25 are provided on the surface of the other plate bodies 24 away from the clamping space 21; elastic pads 25 protrude from both surfaces of the other plate bodies 24 along the first direction a.

[0057] Therefore, by setting the elastic pad 25, the friction between the solid-state battery cell and the solid-state battery cell can be increased, and the solid-state battery cell can be clamped more stably.

[0058] In some embodiments, each elastic pad 25 protrudes along the first direction a from the corresponding plate body 24 with a thickness of not less than 25 μm.

[0059] Specifically, each elastic pad 25 is distributed circumferentially along the corresponding plate body 24, and a gap will be formed between two adjacent elastic pads 25. When the solid-state battery cell is clamped in the clamping space 21, each elastic pad 25 is in close contact with the surface of the solid-state battery cell, and the gap formed between two adjacent elastic pads 25 can provide a flow channel for the pressure medium in the receiving cavity 11.

[0060] Understandably, the pressure medium used in isostatic pressing is usually an oil-based substance such as silicone oil, which has a high viscosity. Therefore, the thickness of the elastic pad 25 will affect the size of the formed gap, and thus affect the efficiency of the pressure medium entering the clamping space 21 from the receiving cavity 11.

[0061] By setting the thickness of the elastic pad 25 within the aforementioned range, the size of the gap formed between adjacent elastic pads 25 can be effectively increased, thereby allowing the pressure medium in the receiving cavity 11 to enter the clamping space 21 more smoothly and evenly and to contact the surface of the solid-state battery cell, thereby improving the consistency and density of densification.

[0062] In some embodiments, each elastic pad 25 is made of a high-temperature resistant material.

[0063] Specifically, in the isostatic pressing process, higher temperatures are typically required to achieve good densification and improve the creep properties of the powder during isostatic pressing. Therefore, the temperature of the pressure medium is usually relatively high, resulting in a generally high ambient temperature for the elastic pad 25.

[0064] Therefore, by making the material of the elastic pad 25 a high-temperature resistant material, the elastic pad 25 can be made more stable in the receiving cavity 11.

[0065] In some embodiments, the heat resistance temperature of each elastic pad 25 is not lower than 120°C.

[0066] As one specific embodiment, the elastic pad 25 may be made of materials such as rubber or silicone.

[0067] Thus, the elastic pad 25 has more stable performance in the pressure medium, enabling the elastic pad 25 to smoothly and stably clamp the solid-state battery cell and improve the stability during the isostatic pressing process.

[0068] In some embodiments, the material of each plate body 24 is a corrosion-resistant metal material.

[0069] Specifically, the material of each plate body 24 can be, but is not limited to, corrosion-resistant metal materials such as aluminum alloy or stainless steel, which can effectively improve the strength and corrosion resistance of the plate body 24, making the clamping assembly 20 clamp the solid-state battery cell more stably in the receiving cavity 11.

[0070] like Figure 4 As shown, in some embodiments, the battery cell 200 includes an electrode assembly 201 and a film layer 202 covering the outer periphery of the electrode assembly 201. In the first direction a, the projection of the electrode assembly 201 falls within the projection range of the flow port 23, and the projection of the flow port 23 also falls within the projection range of the film layer 202.

[0071] Specifically, the battery cell 200 includes an electrode assembly 201 and a film layer 202. The electrode assembly 201 includes a positive electrode sheet, a negative electrode sheet, and a solid electrolyte that are stacked or wound together. The film layer 202 refers to an aluminum-plastic film covering the outside of the electrode assembly 201.

[0072] Understandably, when performing isostatic pressing on the battery cell 200, the internal electrode assembly 201 is actually being densified. Therefore, in the first direction a, the projection of the electrode assembly 201 falls within the projection range of the flow port 23, that is, the electrode assembly 201 is located in the flow port 23. The pressure medium in the receiving cavity 11 can contact the location of the electrode assembly 201 through the flow port 23, uniformly applying pressure to the electrode assembly 201, thereby improving the consistency and degree of densification.

[0073] Furthermore, in the first direction a, the projection of the outlet 23 falls within the projection range of the film layer 202. That is, the plate body 24 and the elastic pads 25 on it actually contact the aluminum-plastic film outside the electrode assembly 201 and achieve clamping and fixation. In this way, during the densification process, the volume of the electrode assembly 201 gradually shrinks, and the elastic pads 25 can apply a certain tension to the aluminum-plastic film, which can effectively reduce the probability of bending deformation of the solid-state battery cell due to uneven shrinkage of different materials during the densification shrinkage process, and effectively protect the appearance of the solid-state battery cell.

[0074] Therefore, through the above structure, not only can the pressure medium in the cavity 11 make more uniform contact with the position of the electrode assembly 201 in the battery cell 200, improving the consistency and density of densification; but also the elastic pad 25 can apply a certain tension to the outer membrane layer 202, which can effectively reduce the probability of bending deformation of the solid battery cell due to uneven shrinkage of different materials during the densification shrinkage process, and effectively protect the appearance of the solid battery cell.

[0075] In some embodiments, the clamping assembly 20 further includes a plurality of connectors 26, each connector 26 being connected between the clamping plates 22 along a first direction a, and all connectors 26 being spaced apart circumferentially along the flow port 23.

[0076] Specifically, the connector 26 is connected between each clamping plate 22 along the first direction a, so that each clamping plate 22 can better clamp and fix the solid-state battery cell located in the clamping space 21. Among them, all the connectors 26 are arranged at intervals along the circumference of the flow port 23, thereby making the force on each clamping plate 22 more uniform and improving the densification effect.

[0077] Therefore, by setting the connector 26, not only can the clamping stability of the solid-state battery cell in the clamping space 21 be effectively improved, but the force on each clamping plate 22 can also be made more uniform, thus improving the densification effect.

[0078] In some embodiments, a plurality of connection holes (not shown in the figure) are formed through each clamping plate 22 along a first direction a, and the connection holes are spaced apart circumferentially along the flow port 23. The clamping assembly 20 also includes a locking member 27, and each connector 26 is inserted through a corresponding connection hole along the first direction a, and the locking member 27 is locked to at least one end of the corresponding connector 26 along the first direction a.

[0079] Specifically, the connector 26 may be configured as a guide rod, and the guide rod has external threads on its outer periphery.

[0080] Furthermore, multiple connecting holes are formed through each clamping plate 22 along the first direction a, and these connecting holes are spaced apart circumferentially along the flow port 23. In this way, the guide rod can pass through the connecting holes on each clamping plate 22 along the first direction a, thereby connecting the clamping plates 22.

[0081] In addition, the clamping assembly 20 also includes a locking member 27, which may be, but is not limited to, a nut. The nut is tightened into the thread of the guide rod to fix the guide rod to the clamping plate 22.

[0082] Therefore, through the above structure, the spacing between each clamping plate 22 in the first direction a can be adjusted, and each clamping plate 22 can be connected and fixed by the connector 26 and the locking member 27, thereby better clamping the solid-state battery cell in the clamping space 21.

[0083] Based on the same concept as the isostatic pressing device 100 described above, this application also provides a battery production apparatus, including the isostatic pressing device 100 as described above.

[0084] According to one or more embodiments, in specific use, the solid-state battery cells are first arranged one by one in each clamping space 21, and the solid-state battery cells are clamped and fixed by each clamping plate 22. Then, the clamping assembly 20 holding the solid-state battery cells can be placed into the receiving cavity 11. A support frame can also be provided in the receiving cavity 11, and the clamping assembly 20 holding the solid-state battery cells is placed on the support frame.

[0085] Furthermore, the outer casing 10 is sealed to form a closed cavity 11, and the solid-state battery cell is densified by the pressure medium inside the cavity 11.

[0086] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0087] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An isostatic pressing device, characterized in that, An isostatic pressing device is used to perform isostatic pressing on individual battery cells, the isostatic pressing device comprising: The housing has a receiving cavity for containing a pressure medium; and A clamping assembly is disposed within the receiving cavity and includes at least two clamping plates. Each clamping plate includes a plate body and elastic pads. The plate bodies are spaced apart along a first direction to form a clamping space for fixing the battery cell between every two adjacent plate bodies. A flow port communicating between the clamping space and the receiving cavity is formed through each plate body along the first direction. Each plate body is provided with a plurality of elastic pads, which are spaced apart around the outer periphery of the corresponding flow port. Along the first direction, each elastic pad protrudes from the plate body toward the corresponding clamping space. The battery cell includes an electrode assembly and a film layer covering the outer periphery of the electrode assembly; in the first direction, the projection of the electrode assembly falls within the projection range of the flow port, and the projection of the flow port falls within the projection range of the film layer. The clamping space is connected to the receiving cavity along the first direction, the second direction and the third direction respectively; the first direction, the second direction and the third direction are perpendicular to each other.

2. The isostatic pressing device according to claim 1, characterized in that, Each of the elastic pads protrudes along the first direction from the corresponding plate body with a thickness of not less than 25 μm.

3. The isostatic pressing device according to claim 1, characterized in that, The material of each elastic pad is a high-temperature resistant material.

4. The isostatic pressing device according to claim 3, characterized in that, The heat resistance temperature of each of the elastic pads is not lower than 120℃.

5. The isostatic pressing device according to claim 1, characterized in that, The material of each plate body is a corrosion-resistant metal material.

6. The isostatic pressing device according to claim 1, characterized in that, The clamping assembly further includes a plurality of connectors, each of which is connected between the clamping plates along the first direction, and all the connectors are spaced apart circumferentially along the flow port.

7. The isostatic pressing device according to claim 6, characterized in that, Each of the clamps has a plurality of connecting holes extending through it along the first direction, and the connecting holes are spaced apart circumferentially along the flow port. The clamping assembly further includes a locking member, each of the connectors being disposed in the corresponding connector hole along the first direction, and the locking member being locked to at least one end of the corresponding connector along the first direction.

8. A battery production equipment, characterized in that, Includes the isostatic pressure apparatus as described in any one of claims 1-7.

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