Pressing apparatus and battery production device

Abstract

The present application relates to a pressing apparatus and a battery production device. The pressing apparatus comprises: a support member, having a support surface for supporting a first electrode sheet; a positioning assembly, disposed on the support surface and defining a first positioning space and a second positioning space, the first positioning space and the second positioning space being disposed along a stacking direction of the first electrode sheet and a second electrode sheet, and the first positioning space being located between the support surface and the second positioning space; and a first pressure assembly, movably disposed on the side of the positioning assembly away from the support member along the stacking direction, and used for applying pressure to the first electrode sheet and the second electrode sheet in the positioning assembly to form a laminated electrode sheet unit. In the present application, the positioning assembly can protect an overhang region, so that the pressing apparatus can apply high pressure to the first electrode sheet, an electrolyte layer, and the second electrode sheet, thereby protecting the overhang region from being crushed, and enabling the first electrode sheet, the electrolyte layer, and the second electrode sheet to be more closely attached.

Description

Pressurization device and battery production equipment Related applications

[0001] This application claims priority to Chinese patent application No. 2024230449108, filed on December 10, 2024, entitled "Pressure device and battery production equipment", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and in particular to a pressurizing device and battery production equipment. Background Technology

[0003] Compared to traditional battery cells, solid-state battery cells replace the electrolyte with a solid electrolyte layer sandwiched between the positive and negative electrodes. Therefore, the tightness of the adhesion between the positive and negative electrodes and the electrolyte layer directly affects the performance of the solid-state battery cell.

[0004] Therefore, it is necessary to pressurize the electrode assembly of a solid-state battery cell to ensure a tighter bond between the positive and negative electrodes and the electrolyte layer. However, current pressurization techniques for solid-state battery cell electrode assemblies can easily lead to crushing of the overhang region, affecting the performance of the electrode assembly. Summary of the Invention

[0005] Based on this, this application provides a pressurization device and battery production equipment.

[0006] In a first aspect, this application provides a pressurizing device for pressurizing an electrode assembly of a solid-state battery cell. The electrode assembly includes a first electrode, a second electrode, and an electrolyte layer. The length of the first electrode is greater than the length of the second electrode, and / or the width of the first electrode is greater than the width of the second electrode. The electrolyte layer is fixed to one side surface of the first electrode. The pressurizing device includes a support member, a positioning component, and a first pressure component. The support member has a support surface for supporting the first electrode, and the support surface contacts the side surface of the first electrode facing away from the electrolyte layer. The positioning component is disposed on the support surface and defines a first positioning space for positioning the first electrode and a second positioning space for positioning the second electrode. The first positioning space and the second positioning space are disposed along the stacking direction of the first and second electrodes, and the first positioning space is located between the support surface and the second positioning space. The first pressure component is movably disposed along the stacking direction on the side of the positioning component facing away from the support member, and is used to apply pressure to the first and second electrodes in the positioning component to form a stacked electrode unit.

[0007] With the above structure, the positioning component can protect the overhang area between the first electrode and the second electrode, and the first pressure component can apply greater pressure to the stacked first electrode, electrolyte layer and second electrode. While protecting the overhang area from being crushed, it makes the first electrode, electrolyte layer and second electrode fit more tightly and improves the performance of the electrode assembly.

[0008] In some embodiments, the positioning component includes a first positioning block and a second positioning block disposed above the first positioning block, the first positioning block enclosing a first positioning space and the second positioning block enclosing a second positioning space.

[0009] The above structure not only improves the stability of the first and second electrodes during pressurization, but also protects the overhang region and reduces the probability of the overhang region being crushed.

[0010] In some embodiments, the first pressure assembly includes a pressure block and a pressure head, the pressure head being disposed on a side surface of the pressure block facing the positioning assembly; wherein the pressure head has a pressing position at least partially located in the second positioning space and pressing against the electrode unit and a separating position located outside the second positioning space.

[0011] The above structure enables stable pressurization of the first electrode, electrolyte layer, and second electrode within the first and second positioning spaces, allowing them to successfully form electrode units.

[0012] In some embodiments, the support surface, the side surface of the pressure head facing the positioning component, and the surface of the positioning component that contacts the electrode unit are all provided as smooth surfaces.

[0013] Therefore, once the pressure is applied, the tightly compressed electrode unit is less likely to stick to the pressure device, thus enabling better demolding and ensuring that the electrode unit remains stably bonded after the pressure is applied.

[0014] In some embodiments, the pressurizing device further includes a first heating element disposed on at least one of the support member, the positioning component, and the first pressure component, and used to heat the electrode unit.

[0015] This reduces the yield strength of the first electrode, electrolyte layer, and second electrode, making it easier to pressurize and densify them.

[0016] In some embodiments, the heating temperature of the first heating element is 25°C to 2000°C.

[0017] In some embodiments, the pressure applied by the first pressure component to the electrode unit ranges from 500t to 10000t.

[0018] The above structure effectively controls the heating temperature of the first heating element and the pressure of the first pressure component, thereby effectively improving the yield strength of the first electrode, the electrolyte layer and the second electrode, enabling a more stable and tighter fit between the first electrode, the electrolyte layer and the second electrode.

[0019] In some embodiments, the pressurizing device further includes a second pressure assembly having a receiving space for accommodating at least two stacked electrode units, the second pressure assembly being configured to apply pressure to each electrode unit within the receiving space to form an electrode assembly.

[0020] Therefore, the electrode assembly is divided into multiple electrode units, each of which undergoes a pressure treatment, resulting in a dense and stable structure for each unit. By stacking multiple electrode units sequentially and then applying pressure using a second pressure component, the electrode assembly can be formed more stably and quickly.

[0021] In some embodiments, the second pressure assembly is configured as a flat pressure assembly or an isostatic pressure assembly. With the above structure, since each electrode unit has a stable structure, the electrode assembly structure can be formed more efficiently and stably during the second pressurization.

[0022] In some embodiments, the pressure range of the pressure-regulating component is 20t to 500t.

[0023] In some embodiments, the pressure range of the isostatic pressure component is 50 MPa to 1000 MPa.

[0024] Therefore, since each electrode unit has been pressurized independently and has a relatively dense and stable structure, when the second pressure assembly applies pressure for the second time, a smaller pressure can be used. On the basis of assembling each electrode unit into an electrode assembly, the probability of the overhang area being crushed again can be effectively reduced, and the pressurization efficiency can be improved.

[0025] In some embodiments, the pressurizing device further includes a second heating element disposed on the second pressure assembly, the second heating element being used to heat each electrode unit within the accommodating space; wherein the heating temperature of the second heating element is 25°C to 300°C.

[0026] By applying a second pressure to each stacked electrode unit through the above structure, the electrode units can be more tightly bonded together, thus successfully forming an electrode assembly.

[0027] Secondly, this application also provides a battery production apparatus, including the pressurization device described above.

[0028] The aforementioned pressurizing device and battery production equipment position the first electrode and the second electrode in the first positioning space and the second positioning space, respectively. Then, pressurize the stacked first electrode, the second electrode, and the electrolyte layer between them to form an electrode unit. During this process, the positioning component can protect the overhang area between the first electrode and the second electrode, allowing the pressurizing device to apply greater pressure to the stacked first electrode, electrolyte layer, and second electrode. While protecting the overhang area from being crushed, this makes the first electrode, electrolyte layer, and second electrode fit more tightly together, improving the performance of the electrode assembly. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0030] Figure 1 is a schematic diagram of the overall structure of the pressurization device according to one or more embodiments.

[0031] Figure 2 is a schematic diagram of the structure of an electrode assembly according to one or more embodiments.

[0032] Figure 3 is a structural schematic diagram of the positioning component in a pressurizing device according to one or more embodiments.

[0033] Explanation of reference numerals in the attached drawings: 100, pressurizing device; 200, electrode assembly; 201, first electrode; 202, second electrode; 203, electrode unit; 10, support member; 20, positioning assembly; 30, first pressure assembly; 11, support surface; 21, first positioning block; 22, second positioning block; 31, pressure block; 32, pressure head. Detailed Implementation

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in other fields. With the continuous expansion of battery applications, market demand is also constantly increasing.

[0041] Traditional battery cells typically include a casing and an electrode assembly disposed inside the casing. The casing surrounds the electrode assembly and is filled with electrolyte so that the electrode assembly can be fully immersed in the electrolyte.

[0042] Compared to traditional battery cells, solid-state battery cells replace the electrolyte with a solid electrolyte layer sandwiched between the positive and negative electrode plates. Solid-state battery cells offer higher safety and higher energy density, and are therefore being used more and more widely.

[0043] For a solid-state battery cell, the positive electrode, electrolyte layer, and negative electrode are stacked sequentially to form an electrode assembly. That is, the electrolyte layer and the positive and negative electrodes are in solid-solid surface contact. Therefore, it is necessary to ensure that the electrolyte layer can adhere tightly to the positive and negative electrodes on both sides, allowing for stable contact between the electrolyte layer and the electrodes.

[0044] Therefore, during the production of solid-state battery cells, it is usually necessary to pressurize the electrode assembly to ensure a tighter bond between the positive and negative electrode sheets and the electrolyte layer.

[0045] It should be noted that, in order to reduce problems such as lithium plating in electrode components and improve the safety of electrode components, an overhang region is usually designed into the structure of the electrode components. The overhang region refers to the part of the negative electrode that extends beyond the positive electrode in the length and / or width directions. That is, the edges of the positive and negative electrodes are not aligned, but have a certain amount of misalignment.

[0046] Furthermore, when pressurizing the electrode assembly, if the pressure is too low, the electrolyte layer will not adhere well to the positive and negative electrode plates, thus affecting the performance of the electrode assembly. Conversely, if the pressure is too high, it can easily cause the overhang area to collapse, which will also affect the performance of the electrode assembly.

[0047] Based on the above considerations, to address the issue of overhang region easily crushing during pressurization of electrode assemblies, thus affecting electrode assembly performance, one or more embodiments of this application provide a pressurization device. This device positions a first electrode and a second electrode within a first positioning space and a second positioning space, respectively. Then, it pressurizes the stacked first and second electrode sheets, along with the electrolyte layer between them, to form an electrode unit. During this process, the positioning component protects the overhang region between the first and second electrode sheets, allowing the pressurization device to apply greater pressure to the stacked first electrode, electrolyte layer, and second electrode. This protects the overhang region from crushing while ensuring a tighter fit between the first electrode, electrolyte layer, and second electrode, thereby improving the performance of the electrode assembly.

[0048] Referring to Figures 1 and 2, one embodiment of this application provides a pressurizing device 100 for pressurizing the electrode assembly 200 of a solid-state battery cell. The electrode assembly 200 includes a first electrode 201, a second electrode 202, and an electrolyte layer (not shown in the figures). The length of the first electrode 201 is greater than the length of the second electrode 202, and / or the width of the first electrode 201 is greater than the width of the second electrode 202. The electrolyte layer is fixed to one side surface of the first electrode 201.

[0049] The pressurizing device 100 includes a support member 10, a positioning assembly 20, and a first pressure assembly 30. The support member 10 has a support surface 11 for supporting a first electrode 201, and the support surface 11 is in contact with the surface of the first electrode 201 facing away from the electrolyte layer. The positioning assembly 20 is disposed on the support surface 11 and defines a first positioning space (not shown) for positioning the first electrode 201 and a second positioning space (not shown) for positioning the second electrode 202. The first positioning space and the second positioning space are disposed along the stacking direction of the first electrode 201 and the second electrode 202, and the first positioning space is located between the support surface 11 and the second positioning space. The first pressure assembly 30 is movably disposed along the stacking direction on the side of the positioning assembly 20 facing away from the support member 10, and is used to apply pressure to the first electrode 201 and the second electrode 202 in the positioning assembly 20 to form a stacked electrode unit 203.

[0050] It should be noted that the pressurizing device 100 is used to pressurize the electrode assembly 200 of the solid-state battery cell. The electrode assembly 200 of the solid-state battery cell includes a first electrode 201, a second electrode 202, and an electrolyte layer disposed between the first electrode 201 and the second electrode 202. The first electrode 201 can be configured as a positive electrode or a negative electrode, and the second electrode 202 can be configured as a negative electrode or a positive electrode corresponding to the first electrode 201.

[0051] The length of the first electrode 201 is greater than the length of the second electrode 202, and / or the width of the first electrode 201 is greater than the width of the second electrode 202. That is, the portion of the first electrode 201 that extends beyond the second electrode 202 in the length and / or width directions constitutes the overhang region; in other words, an overhang region is formed at the edge of the first electrode 201. During the lamination process of the first electrode 201 and the second electrode 202, the electrolyte layer is first fixed to one side surface of the first electrode 201 by coating, bonding, or other means. Then, the second electrode 202 is stacked on the side of the first electrode 201 where the electrolyte layer is located, so that the first electrode 201, the electrolyte layer, and the second electrode 202 are stacked sequentially.

[0052] The pressurizing device 100 includes a support member 10, which is a component that supports the first electrode 201, the electrolyte layer, and the second electrode 202, allowing them to be stacked sequentially on the support member 10 for pressurization. The upper surface of the support member 10 is formed as a support surface 11, on which the first electrode 201 can be placed first, with the side containing the electrolyte layer facing upwards. The second electrode 202 is then stacked on top of the electrolyte layer, thus achieving the sequential stacking of the first electrode 201, the electrolyte layer, and the second electrode 202.

[0053] The pressurizing device 100 also includes a positioning component 20. The positioning component 20 is a component capable of positioning the first electrode 201 and the second electrode 202, which are stacked on the support surface 11, so as to keep them stable during the pressurization process. The positioning component 20 is disposed on the support surface 11 and defines a first positioning space and a second positioning space. The first positioning space and the second positioning space are stacked sequentially on the support surface 11, and the first positioning space is located between the support surface 11 and the second positioning space, that is, the second positioning space is located above the first positioning space.

[0054] Thus, when the first electrode 201 is placed on the support surface 11, it is confined within the first positioning space, thereby restricting its movement in the direction parallel to the support surface 11. Further, after the first electrode 201 is positioned in the first positioning space, a second electrode 202 is stacked on top of the first electrode 201, with the electrolyte layer located between the first and second electrodes. Simultaneously, the second electrode 202 is confined within the second positioning space, thereby restricting its movement in the direction parallel to the support surface 11.

[0055] Therefore, when the first electrode 201 and the second electrode 202 are stacked on the support surface 11, the first positioning space and the second positioning space can respectively position the first electrode 201 and the second electrode 202, making the stacking arrangement between the first electrode 201 and the second electrode 202 more stable, and enabling the first electrode 201 and the second electrode 202 to be stacked faster and more accurately, so as to facilitate the pressurization operation of the first electrode 201 and the second electrode 202 and reduce the probability of the first electrode 201 and the second electrode 202 shifting during the pressurization process.

[0056] Furthermore, the pressurizing device 100 also includes a first pressure component 30, which is a component that can pressurize the first electrode 201, the electrolyte layer and the second electrode 202 stacked on the support surface 11 so that the three can be tightly attached to form an electrode unit 203.

[0057] Specifically, the first pressure component 30 is movably disposed in a direction perpendicular to the support surface 11 and is located on the side of the positioning component 20 opposite to the support member 10. Thus, when the first pressure component 30 moves toward the positioning component 20, it can pressurize the first electrode 201, the electrolyte layer, and the second electrode 202 stacked in the first and second positioning spaces, forming mutually adhering electrode units 203. When the first pressure component 30 moves away from the positioning component 20, the electrode unit 203 formed after pressurization can be removed, and the next pressurization operation can continue.

[0058] With the above structure, the positioning component 20 can protect the overhang area between the first electrode 201 and the second electrode 202, so that the first pressure component 30 can apply greater pressure to the stacked first electrode 201, electrolyte layer and second electrode 202. While protecting the overhang area from being crushed, the first electrode 201, electrolyte layer and second electrode 202 are more tightly attached, thereby improving the performance of the electrode assembly 200.

[0059] As shown in Figure 3, in some embodiments, the positioning component 20 includes a first positioning block 21 and a second positioning block 22 disposed above the first positioning block 21. The first positioning block 21 encloses a first positioning space, and the second positioning block 22 encloses a second positioning space.

[0060] Specifically, the first positioning block 21 is constructed as a hollow rectangular structure, and the hollow outline inside matches the shape of the first electrode 201. Thus, the hollow area of ​​the first positioning block 21 can form a first positioning space. When the first electrode 201 is placed in the first positioning space, the first positioning block 21 can limit the positioning of the first electrode 201.

[0061] The second positioning block 22 is constructed as a hollow rectangular structure, and the hollow outline inside matches the shape of the second pole piece 202. Thus, the hollow area of ​​the second positioning block 22 can form a second positioning space. When the second pole piece 202 is placed in the second positioning space, the second positioning block 22 can limit the position of the second pole piece 202.

[0062] Since the area of ​​the first electrode 201 is larger than the area of ​​the second electrode 202, i.e., an overhang region is formed on the first electrode 201, the area of ​​the first positioning space is larger than the area of ​​the second positioning space. Furthermore, when the second positioning block 22 is positioned above the first positioning block 21, the second positioning block 22 can exert a certain amount of pressure on the overhang region of the first electrode 201. During the pressure application process, it can provide some protection to the overhang region, reducing the probability of the overhang region being crushed.

[0063] The above structure not only improves the stability of the first electrode 201 and the second electrode 202 during pressurization, but also protects the overhang region and reduces the probability of the overhang region being crushed.

[0064] As shown in Figure 1, in some embodiments, the first pressure assembly 30 includes a pressure block 31 and a pressure head 32, with the pressure head 32 disposed on the side surface of the pressure block 31 facing the positioning assembly 20. The pressure head 32 has a pressing position at least partially located in the second positioning space and pressing against the electrode unit 203, and a separating position located outside the second positioning space.

[0065] Specifically, the pressure block 31 can provide a mounting base for the pressure head 32, and the pressure block 31 can be connected to an external device, such as an external drive mechanism, to drive the pressure head 32 to reciprocate in a direction perpendicular to the support surface 11.

[0066] The pressure head 32 is disposed on the side surface of the pressure block 31 facing the positioning component 20, and the size of the pressure head 32 matches the size of the second positioning space. The pressure head 32 has a pressing position and a separating position under the action of the pressure block 31. When the pressure head 32 is in the pressing position, at least a portion of the pressure head 32 is located within the second positioning space, and the lower surface of the pressure head 32 presses against the upper surface of the second electrode 202. Under the pressure of the pressure head 32, the second electrode 202 is pressed downwards, causing the first electrode 201, the electrolyte layer, and the second electrode 202 to fit tightly together, thereby forming the electrode unit 203.

[0067] When the pressurization is completed, the pressure head 32 is moved from the pressing position to the separation position under the action of the pressure block 31. That is, the pressure head 32 is removed from the second positioning space so that the pressure-completed electrode unit 203 can be taken out and a new first electrode 201 and second electrode 202 can be inserted.

[0068] With the above structure, the first electrode 201, the electrolyte layer and the second electrode 202 in the first positioning space and the second positioning space can be stably pressurized, so that they can be successfully formed into electrode unit 203.

[0069] In some embodiments, the support surface 11, the side surface of the pressure head 32 facing the positioning component 20, and the surface of the positioning component 20 that contacts the electrode unit 203 are all provided as smooth surfaces.

[0070] Specifically, the side surface of the pressure head 32 facing the positioning component 20 is the lower surface of the pressure head 32. When the pressure head 32 is in the pressing position, the lower surface of the pressure head 32 contacts the upper surface of the second electrode 202. The surfaces of the positioning component 20 that contact the electrode unit 203 include: the inner surface of the first positioning block 21, the lower surface of the second positioning block 22, and the inner surface of the second positioning block 22.

[0071] The support surface 11, the lower surface of the pressure head 32, and the surface of the positioning component 20 that contacts the electrode unit 203 are all made smooth. After the pressure is applied, the tightly pressed electrode unit 203 is less likely to stick to the pressure device 100, thereby enabling better demolding and ensuring that the electrode unit 203 maintains a stable fit after the pressure is applied.

[0072] In some embodiments, the pressurizing device 100 further includes a first heating element (not shown in the figure), which is disposed on at least one of the support member 10, the positioning component 20, and the first pressure component 30, and is used to heat the electrode unit 203.

[0073] Specifically, the first heating element refers to a component capable of heating the electrode unit 203. The first heating element may be, but is not limited to, a thermocouple. The thermocouple is positioned on at least one of the support member 10, the positioning assembly 20, and the pressure head 32, allowing the thermocouple to contact the first electrode 201 or the second electrode 202 during pressurization, thereby heating the first electrode 201, the electrolyte layer, and the second electrode 202. This reduces the yield strength of the first electrode 201, the electrolyte layer, and the second electrode 202, making it easier to pressurize and densify them.

[0074] In some embodiments, the heating temperature of the first heating element is 25°C to 2000°C. In some embodiments, the pressure applied by the first pressure assembly 30 to the electrode unit 203 ranges from 500t to 10000t.

[0075] The heating temperature of the first heating element affects the structure and yield strength of the first electrode 201, the electrolyte layer, and the second electrode 202. Specifically, excessively high temperatures can easily lead to side reactions in the electrolyte, damaging the structure of the electrolyte layer. Conversely, excessively low temperatures cannot effectively improve the yield strength of the first electrode 201, the electrolyte layer, and the second electrode 202.

[0076] Therefore, the heating temperature of the first heating element is set within the aforementioned range. As a specific embodiment, the heating temperature of the first heating element can be set to 100℃~300℃, which can further improve the heating effect.

[0077] Furthermore, the pressure of the first pressure component 30 will affect the structure of the first electrode 201, the electrolyte layer and the second electrode 202. If the pressure is too low, it will not be conducive to the dense bonding between the first electrode 201, the electrolyte layer and the second electrode 202, while if the pressure is too high, it will cause the first electrode 201, the electrolyte layer and the second electrode 202 to become pulverized.

[0078] Based on this, the pressure of the first pressure component 30 is set to the aforementioned range. As a specific embodiment, the pressure range of the first pressure component 30 can be set to 1000t to 3000t, which can further improve the pressurization effect.

[0079] Through the above structure, the heating temperature of the first heating element and the pressure of the first pressure component 30 are effectively controlled, thereby effectively improving the yield strength of the first electrode 201, the electrolyte layer and the second electrode 202, so that the first electrode 201, the electrolyte layer and the second electrode 202 can be more stably and tightly bonded together.

[0080] In some embodiments, the pressurizing device 100 further includes a second pressure assembly (not shown) having a receiving space for accommodating at least two stacked electrode units 203, the second pressure assembly being configured to apply pressure to each electrode unit 203 within the receiving space to form an electrode assembly 200.

[0081] Specifically, after the first electrode 201, electrolyte layer and second electrode 202 are pressurized by the support member 10, positioning component 20 and first pressure component 30 to form multiple electrode units 203, the multiple electrode units 203 can be stacked in sequence in the receiving space of the second pressure component, and then the multiple electrode units 203 are pressurized by the second pressure component to finally form the electrode assembly 200.

[0082] Therefore, the electrode assembly 200 is divided into multiple electrode units 203, each of which is subjected to pressure treatment, meaning that each electrode unit 203 has a dense and stable structure. In this way, by stacking multiple electrode units 203 sequentially and then applying pressure using a second pressure component, the electrode assembly 200 can be formed more stably and quickly.

[0083] In some embodiments, the second pressure component is configured as a flat pressure component or an isostatic pressure component.

[0084] Specifically, the second pressure component can be pressurized by flat pressure or by isostatic pressure. Since each electrode unit 203 has a stable structure, the structure of the electrode component 200 can be formed more efficiently and stably during the second pressurization.

[0085] It should be noted that the second pressure component can use existing flat pressure or isostatic pressure devices, both of which can achieve pressurization between multiple stacked electrode units 203, thereby successfully forming the electrode assembly 200, which will not be elaborated here.

[0086] In some embodiments, the pressure range of the equalizing component is 20t to 500t. In some embodiments, the pressure range of the isostatic pressure component is 50MPa to 1000MPa.

[0087] When applying a second pressurization to multiple stacked electrode units 203 using equal pressure, the pressure range can be set to 20t to 500t. When applying a second pressurization to multiple stacked electrode units 203 using isostatic pressure, the pressure range can be set to 50MPa to 1000MPa.

[0088] Therefore, since each electrode unit 203 has been pressurized independently and has a relatively dense and stable structure, when the second pressure component pressurizes for the second time, a smaller pressure can be used. On the basis of assembling each electrode unit 203 into the electrode assembly 200, the probability of the overhang area being crushed again can be effectively reduced and the pressurization efficiency can be improved.

[0089] In some embodiments, the pressurizing device 100 further includes a second heating element (not shown) disposed on the second pressure assembly, the second heating element being used to heat each electrode unit 203 within the receiving space. The heating temperature of the second heating element is 25°C to 300°C.

[0090] Specifically, a second heating element is provided on the second pressure assembly. During the second pressurization of the multiple stacked electrode units 203, the second heating element can heat each electrode unit 203, thereby reducing the yield strength of each electrode unit 203 and enabling the electrode units 203 to fit more tightly together.

[0091] Furthermore, the heating temperature of the second heating element can be set to 25℃~300℃. As a specific embodiment, the heating temperature can be set to 50℃~150℃. This can better improve the yield strength of the electrode unit 203.

[0092] By applying pressure to each of the stacked electrode units 203 a second time through the above structure, the electrode units 203 can be more tightly bonded together, thus successfully forming the electrode assembly 200.

[0093] Based on the same concept as the pressurizing device 100 described above, this application also provides a battery production apparatus, including the pressurizing device 100 as described above.

[0094] According to one or more embodiments, in specific use, the electrolyte layer is coated on one side surface of the first electrode 201. At the same time, the first positioning block 21 is first placed on the support surface 11, and then the first electrode 201 is placed in the first positioning space of the first positioning block 21, with the electrolyte layer facing upward.

[0095] Furthermore, the second positioning block 22 is placed on the first positioning block 21. At this time, the second positioning block 22 can press the overhang area of ​​the first electrode 201. Then, the second electrode 202 is placed in the second positioning space of the second positioning block 22, so that the second electrode 202 is stacked on top of the electrolyte layer.

[0096] The first electrode 201, the electrolyte layer, and the second electrode 202 are heated by the first heating element. After heating for a certain period of time, the pressure head 32 moves downward to the pressing position. At this time, the lower surface of the pressure head 32 presses against the second electrode 202. Under the pressure of the pressure head 32, the first electrode 201, the electrolyte layer, and the second electrode 202 are tightly bonded together, achieving densification.

[0097] After pressing for a certain period of time, the pressure head 32 is moved from the pressing position to the separation position so that the electrode unit 203 formed by pressing can be taken out.

[0098] Repeat the above operation to obtain multiple electrode units 203. Stack the multiple electrode units 203 in the receiving space, and then use the second pressure component to apply a second small pressure to the multiple stacked electrode units 203 so that the electrode units 203 can adhere to each other to form an electrode assembly 200.

[0099] 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.

[0100] 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. A pressurizing device for pressurizing an electrode assembly of a solid-state battery cell, the electrode assembly comprising a first electrode, a second electrode, and an electrolyte layer, wherein the length of the first electrode is greater than the length of the second electrode, and / or the width of the first electrode is greater than the width of the second electrode; wherein, The electrolyte layer is fixed to one side surface of the first electrode; The pressurizing device includes: The support member has a support surface for supporting the first electrode, and the support surface is in contact with the side surface of the first electrode facing away from the electrolyte layer. A positioning component is disposed on the support surface and defines a first positioning space for positioning the first electrode and a second positioning space for positioning the second electrode. The first positioning space and the second positioning space are disposed along the stacking direction of the first electrode and the second electrode, and the first positioning space is located between the support surface and the second positioning space. A first pressure component is movably disposed on the side of the positioning component away from the support member along the stacking direction, for applying pressure to the first electrode and the second electrode in the positioning component to form a stacked electrode unit.

2. The pressurizing device according to claim 1, wherein, The positioning component includes a first positioning block and a second positioning block disposed above the first positioning block. The first positioning block encloses and forms the first positioning space, and the second positioning block encloses and forms the second positioning space.

3. The pressurizing device according to claim 1 or 2, wherein, The first pressure component includes a pressure block and a pressure head, wherein the pressure head is disposed on the side surface of the pressure block facing the positioning component; The pressure head has a pressing position that is at least partially located in the second positioning space and presses against the electrode unit, and a separating position that is located outside the second positioning space.

4. The pressurizing device according to claim 3, wherein, The support surface, the side surface of the pressure head facing the positioning component, and the surface of the positioning component that contacts the electrode unit are all designed to be smooth surfaces.

5. The pressurizing device according to any one of claims 1-4, wherein, The pressurizing device further includes a first heating element, which is disposed on at least one of the support member, the positioning component, and the first pressure component, and is used to heat the electrode unit.

6. The pressurizing device according to claim 5, wherein, The heating temperature of the first heating element is 25℃~2000℃.

7. The pressurizing device according to claim 5 or 6, wherein, The pressure applied to the electrode unit by the first pressure component ranges from 500t to 10000t.

8. The pressurizing device according to any one of claims 1-7, wherein, The pressurizing device further includes a second pressure assembly having a receiving space for accommodating at least two of the stacked electrode units, the second pressure assembly being configured to apply pressure to each of the electrode units within the receiving space to form the electrode assembly.

9. The pressurizing device according to claim 8, wherein, The second pressure component is configured as a flat pressure component or an isostatic pressure component.

10. The pressurizing device according to claim 9, wherein, The pressure range of the pressure equalization component is 20t to 500t.

11. The pressurizing device according to claim 9 or 10, wherein, The pressure range of the isostatic pressure component is 50MPa to 1000MPa.

12. The pressurizing device according to claim 8, wherein, The pressurizing device further includes a second heating element disposed on the second pressure assembly, the second heating element being used to heat each of the electrode units within the accommodating space; The heating temperature of the second heating element is 25℃~300℃.

13. A battery manufacturing apparatus, comprising a pressurizing device as described in any one of claims 1-12.

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