Pressurizing device and battery production equipment

Abstract

The utility model relates to a pressurizing device and battery production equipment, and the pressurizing device comprises a supporting part which is provided with a supporting surface for supporting a first pole piece; the positioning assembly is arranged on the supporting surface and defines a first positioning space and a second positioning space, the first positioning space and the second positioning space are arranged in the stacking direction of the first pole piece and the second pole piece, and the first positioning space is located between the supporting surface and the second positioning space; and the first pressure assembly is movably arranged on the side, away from the supporting piece, of the positioning assembly in the stacking direction and used for applying pressure to the first pole piece and the second pole piece in the positioning assembly so as to form a stacked pole piece unit. The positioning assembly can protect the overhang area, so that the pressurizing device can apply large pressure to the first pole piece, the electrolyte layer and the second pole piece, the overhang area is protected from being crushed, and meanwhile, the first pole piece, the electrolyte layer and the second pole piece are attached more tightly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a pressing device and a battery production equipment. BACKGROUND

[0002] Compared with the traditional battery monomer, the solid-state battery monomer replaces the electrolyte with a solid-state electrolyte layer, and the electrolyte layer is sandwiched between the positive and negative electrode sheets. Therefore, whether the positive and negative electrode sheets are tightly attached to the electrolyte layer will directly affect the performance of the solid-state battery monomer.

[0003] Therefore, it is necessary to press the electrode assembly of the solid-state battery monomer to make the positive and negative electrode sheets more tightly attached to the electrolyte layer. However, when pressing the electrode assembly of the solid-state battery monomer, the overhang region of the electrode assembly is easily crushed, which affects the performance of the electrode assembly. Invention content

[0004] Therefore, it is necessary to press the electrode assembly of the solid-state battery monomer to make the positive and negative electrode sheets more tightly attached to the electrolyte layer. However, when pressing the electrode assembly of the solid-state battery monomer, the overhang region of the electrode assembly is easily crushed, which affects the performance of the electrode assembly.

[0005] In the first aspect, the present application provides a pressing device for pressing the electrode assembly of the solid-state battery monomer, the electrode assembly comprising a first electrode sheet, a second electrode sheet and an electrolyte layer, the length of the first electrode sheet being greater than the length of the second electrode sheet, and / or the width of the first electrode sheet being greater than the width of the second electrode sheet; wherein the electrolyte layer is fixed on one side surface of the first electrode sheet. The pressing device comprises a support, a positioning assembly and a first pressure assembly, the support having a support surface for supporting the first electrode sheet, and the support surface being in contact with the side surface of the first electrode sheet away from the electrolyte layer; the positioning assembly is arranged on the support surface and defines a first positioning space for positioning the first electrode sheet and a second positioning space for positioning the second electrode sheet, the first positioning space and the second positioning space being arranged along the stacking direction of the first electrode sheet and the second electrode sheet, and the first positioning space being located between the support surface and the second positioning space; the first pressure assembly is movably arranged on the side of the positioning assembly away from the support along the stacking direction, for applying pressure to the first electrode sheet and the second electrode sheet in the positioning assembly to form a stacked electrode sheet unit.

[0006] Through the above structure, the positioning assembly can protect the overhang region between the first electrode sheet and the second electrode sheet, so that the first pressure assembly can apply a larger pressure to the first electrode sheet, the electrolyte layer and the second electrode sheet arranged in layers, and on the basis of protecting the overhang region from being crushed, the first electrode sheet, the electrolyte layer and the second electrode sheet are more tightly attached, and the performance of the electrode assembly is improved.

[0007] In some embodiments, the positioning assembly comprises a first positioning block and a second positioning block arranged above the first positioning block, the first positioning block enclosing a first positioning space, and the second positioning block enclosing a second positioning space.

[0008] Through the above structure, the stability of the first pole piece and the second pole piece can be improved during the pressing process, and the overhang region can be protected, reducing the probability of the overhang region being crushed.

[0009] In some embodiments, the first pressure assembly comprises a pressing block and a pressing head, the pressing head being arranged on a side surface of the pressing block facing the positioning assembly; wherein the pressing head has a pressing position at least partially located in the second positioning space and pressing against the pole piece unit, and a separation position located outside the second positioning space.

[0010] Through the above structure, the first pole piece, the electrolyte layer and the second pole piece in the first positioning space and the second positioning space can be stably pressed to form the pole piece unit smoothly.

[0011] In some embodiments, the support surface, the side surface of the pressing head facing the positioning assembly, and the surface of the positioning assembly contacting the pole piece unit are all arranged as smooth surfaces.

[0012] Therefore, after the pressing is completed, the compact pole piece unit is not easy to adhere to the pressing device, so that better demolding can be achieved, and the stable fitting of the pole piece unit after the pressing is completed can be ensured.

[0013] In some embodiments, the pressing device further comprises a first heating member arranged on at least one of the support, the positioning assembly, and the first pressure assembly, and used for heating the pole piece unit.

[0014] In this way, the yield strength of the first pole piece, the electrolyte layer and the second pole piece can be reduced, so that the first pole piece, the electrolyte layer and the second pole piece can be more easily pressed and compacted.

[0015] In some embodiments, the heating temperature of the first heating member is 25℃-2000℃; and / or, the pressure range of the first pressure assembly applied to the pole piece unit is 500t-10000t.

[0016] Through the above structure, the heating temperature of the first heating member and the pressure of the first pressure assembly are effectively controlled, thereby effectively improving the yield strength of the first pole piece, the electrolyte layer and the second pole piece, and the first pole piece, the electrolyte layer and the second pole piece can be more stably and closely fitted.

[0017] In some embodiments, the pressing device further comprises a second pressure assembly having a receiving space for receiving the at least two pole piece units arranged in a stack, the second pressure assembly being configured to apply pressure to each of the pole piece units in the receiving space to form the electrode assembly.

[0018] In this way, the electrode assembly is divided into a plurality of pole piece units, each of which is subjected to a pressing process, i.e., each of the pole piece units has a compact and stable structure. In this way, the plurality of pole piece units are sequentially stacked and then pressed by the second pressure assembly, so that the electrode assembly can be formed more stably and quickly.

[0019] In some embodiments, the second pressure assembly is configured as a flat pressing assembly or an isostatic pressing assembly. With the above structure, due to the stable structure of each pole piece unit, the second pressing can be more efficient and stable to form the structure of the electrode assembly.

[0020] In some embodiments, the pressure range of the flat pressing assembly is 20t-500t; and / or the pressure range of the isostatic pressing assembly is 50MPa-1000MPa.

[0021] In this way, because each pole piece unit is subjected to independent pressing and has a relatively compact and stable structure, the second pressure assembly can use a smaller pressure for the second pressing, which can effectively reduce the probability of overhang area being crushed again and improve the pressing efficiency on the basis of assembling the pole piece units to form the electrode assembly.

[0022] In some embodiments, the pressing device further comprises a second heating member arranged on the second pressure assembly, the second heating member being used for heating each of the pole piece units in the receiving space; wherein the heating temperature of the second heating member is 25℃-300℃.

[0023] With the above structure, the second pressing of each of the pole piece units arranged in a stack can make each of the pole piece units fit more tightly, so that the electrode assembly can be formed smoothly.

[0024] In a second aspect, the application also provides a battery production equipment comprising the pressing device as described above.

[0025] The pressing device and the battery production equipment position the first electrode sheet and the second electrode sheet in the first positioning space and the second positioning space respectively, and then press the first electrode sheet, the electrolyte layer and the second electrode sheet arranged in layers and the electrolyte layer therebetween to form an electrode sheet unit. In this process, the positioning assembly can protect the overhang region between the first electrode sheet and the second electrode sheet, so that the pressing device can exert greater pressure on the first electrode sheet, the electrolyte layer and the second electrode sheet arranged in layers, and make the first electrode sheet, the electrolyte layer and the second electrode sheet adhere more closely on the basis of protecting the overhang region from being crushed, thereby improving the performance of the electrode assembly. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is an overall structural schematic diagram of the pressing device according to one or more embodiments.

[0027] Figure 2 It is a structural schematic diagram of the electrode assembly according to one or more embodiments.

[0028] Figure 3 It is a structural schematic diagram of the positioning assembly in the pressing device according to one or more embodiments.

[0029] BRIEF DESCRIPTION OF DRAWINGS: 100, pressing device; 200, electrode assembly; 201, first electrode sheet; 202, second electrode sheet; 203, electrode sheet unit; 10, support; 20, positioning assembly; 30, first pressure assembly; 11, support surface; 21, first positioning block; 22, second positioning block; 31, pressing block; 32, pressure head. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below in combination with the drawings. In the following description, a large number of specific details are set forth in order to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0031] In the description of the application, it should be understood that, if there are these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0032] In addition, if there are these terms "first", "second", these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this application, unless otherwise explicitly specified and limited, if there are terms such as "mounting", "connecting", "connecting", "fixing" and the like, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0034] In this application, unless otherwise explicitly specified and limited, if there are similar descriptions such as "first feature on or under second feature", the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0035] It is to be noted that when an element such as a layer, region or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements can be present. In addition, it is to be noted that the term "comprising" or "containing" herein is used in the sense of "including", that is to say, in the sense of "comprising", and not in the sense of "consisting only of", on the proviso that the compositions, methods, or processes described herein are not exclusively comprised only of the elements and / or steps of the composition, method or process.

[0036] At present, from the development of market situation, the application of battery is more and more extensive. The battery is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles and other fields. With the continuous expansion of the application field of battery, the market demand is also increasing.

[0037] The traditional battery monomer usually includes a shell and an electrode assembly arranged inside the shell. The shell is wrapped outside the electrode assembly, and an electrolyte is filled in the shell, so that the electrode assembly can be fully soaked in the electrolyte.

[0038] Compared with the traditional battery monomer, the electrolyte in the solid-state battery monomer is replaced by a solid-state electrolyte layer, and the electrolyte layer is sandwiched between the positive and negative electrode sheets. The solid-state battery monomer has higher safety and higher energy density, so it has been more and more widely used.

[0039] For the solid-state battery monomer, the positive electrode sheet, the electrolyte layer and the negative electrode sheet are sequentially stacked to form an electrode assembly. That is, the electrolyte layer and the positive and negative electrode sheets are in surface contact with each other. Therefore, it is necessary to make the electrolyte layer tightly adhere to the positive and negative electrode sheets on both sides, so that the electrolyte layer can stably contact the positive and negative electrode sheets.

[0040] Therefore, in the production process of the solid-state battery monomer, the electrode assembly usually needs to be pressed to make the positive and negative electrode sheets and the electrolyte layer adhere more tightly.

[0041] It should be noted that in order to reduce the problem of lithium precipitation of the electrode assembly and improve the safety of the electrode assembly, an overhang region is usually designed in the structure of the electrode assembly. The overhang region refers to the part of the negative electrode sheet that exceeds the positive electrode sheet in the length and / or width direction, that is, the edges of the positive and negative electrode sheets are not aligned, but have a certain amount of misalignment.

[0042] On this basis, when the electrode assembly is pressed, if the pressure is too small, the electrolyte layer cannot be well attached to the positive and negative electrode sheets, thereby affecting the performance of the electrode assembly. If the pressure is too large, the overhang area is easily crushed, which also affects the performance of the electrode assembly.

[0043] Based on the above considerations, in order to solve the problem that the overhang area is easily crushed when the electrode assembly is pressed, affecting the performance of the electrode assembly, one or more embodiments of the present application provide a pressing device, which positions the first electrode sheet and the second electrode sheet in the first positioning space and the second positioning space respectively, and then presses the first electrode sheet and the second electrode sheet and the electrolyte layer therebetween arranged in layers to form an electrode sheet unit. In this process, the positioning assembly can protect the overhang area between the first electrode sheet and the second electrode sheet, so that the pressing device can exert a larger pressure on the first electrode sheet, the electrolyte layer and the second electrode sheet arranged in layers, and on the basis of protecting the overhang area from being crushed, the first electrode sheet, the electrolyte layer and the second electrode sheet are attached more closely, improving the performance of the electrode assembly.

[0044] Referring to Figure 1 and Figure 2 , an embodiment of the present application provides a pressing device 100 for pressing an electrode assembly 200 of a solid-state battery monomer. The electrode assembly 200 includes a first electrode sheet 201, a second electrode sheet 202 and an electrolyte layer (not shown in the figure), the length of the first electrode sheet 201 is greater than the length of the second electrode sheet 202, and / or the width of the first electrode sheet 201 is greater than the width of the second electrode sheet 202. The electrolyte layer is fixed on one side surface of the first electrode sheet 201.

[0045] The pressing device 100 includes a support 10, a positioning assembly 20 and a first pressure assembly 30. The support 10 has a support surface 11 for supporting the first electrode sheet 201, and the support surface 11 is in contact with the side surface of the first electrode sheet 201 away from the electrolyte layer. The positioning assembly 20 is arranged on the support surface 11 and defines a first positioning space (not shown in the figure) for positioning the first electrode sheet 201 and a second positioning space (not shown in the figure) for positioning the second electrode sheet 202. The first positioning space and the second positioning space are arranged along the stacking direction of the first electrode sheet 201 and the second electrode sheet 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 arranged on the side of the positioning assembly 20 away from the support 10 along the stacking direction, for applying pressure to the first electrode sheet 201 and the second electrode sheet 202 in the positioning assembly 20 to form a stacked electrode sheet unit 203.

[0046] It should be noted that the pressing device 100 is used for pressing the electrode assembly 200 of the solid-state battery cell, wherein the electrode assembly 200 of the solid-state battery cell comprises a first electrode sheet 201, a second electrode sheet 202 and an electrolyte layer arranged between the first electrode sheet 201 and the second electrode sheet 202. The first electrode sheet 201 can be arranged as a positive electrode sheet or a negative electrode sheet, and the second electrode sheet 202 can be arranged as a negative electrode sheet or a positive electrode sheet corresponding to the first electrode sheet 201.

[0047] The length of the first electrode sheet 201 is greater than the length of the second electrode sheet 202, and / or the width of the first electrode sheet 201 is greater than the width of the second electrode sheet 202. That is, the part of the first electrode sheet 201 exceeding the second electrode sheet 202 in the length direction and / or the width direction is the overhang region, that is, the overhang region is formed at the edge of the first electrode sheet 201. In the laminating and pressing process of the first electrode sheet 201 and the second electrode sheet 202, the electrolyte layer is first fixed on one side surface of the first electrode sheet 201 by coating or pasting or other means, and then the second electrode sheet 202 is laminated on the side of the first electrode sheet 201 provided with the electrolyte layer, so that the first electrode sheet 201, the electrolyte layer and the second electrode sheet 202 are sequentially laminated.

[0048] The pressing device 100 comprises a support 10, which is a component capable of supporting the first electrode sheet 201, the electrolyte layer and the second electrode sheet 202, so that they are sequentially laminated on the support 10 for pressing. The upper surface of the support 10 is formed as a support surface 11, and the first electrode sheet 201 can be placed on the support surface 11 with the side surface provided with the electrolyte layer upward. In this way, the second electrode sheet 202 is continuously laminated on the electrolyte layer, so that the first electrode sheet 201, the electrolyte layer and the second electrode sheet 202 are sequentially laminated.

[0049] The pressing device 100 further comprises a positioning assembly 20, which is a component capable of positioning the first electrode sheet 201 and the second electrode sheet 202 laminated on the support surface 11 respectively, so that they remain stable during pressing. The positioning assembly 20 is arranged on the support surface 11 and defines a first positioning space and a second positioning space, which are sequentially laminated above 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] likeFigure 3 As shown, 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] like Figure 1 As shown, 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.

[0061] 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.

[0062] The pressing head 32 is arranged on the side surface of the pressing block 31 facing the positioning assembly 20, and the size of the pressing head 32 matches the size of the second positioning space. The pressing head 32 has a pressing position and a separation position under the driving of the pressing block 31. When the pressing head 32 is at the pressing position, at least part of the pressing head 32 is located in the second positioning space, and the lower surface of the pressing head 32 presses against the upper surface of the second pole piece 202. Under the pressure of the pressing head 32, the second pole piece 202 is pressed downward, so that the first pole piece 201, the electrolyte layer and the second pole piece 202 are tightly attached, thereby forming the pole piece unit 203.

[0063] When the pressing is completed, the pressing head 32 is moved from the pressing position to the separation position under the driving of the pressing block 31, that is, the pressing head 32 is separated from the second positioning space, so as to take out the pole piece unit 203 after the pressing is completed, and place new first pole piece 201 and second pole piece 202.

[0064] Through the above structure, the first pole piece 201, the electrolyte layer and the second pole piece 202 in the first positioning space and the second positioning space can be stably pressed, so that the pole piece unit 203 is successfully formed.

[0065] In some embodiments, the support surface 11, the side surface of the pressing head 32 facing the positioning assembly 20, and the surface of the positioning assembly 20 contacting the pole piece unit 203 are all smooth surfaces.

[0066] Specifically, the side surface of the pressing head 32 facing the positioning assembly 20 is the lower surface of the pressing head 32, and when the pressing head 32 is at the pressing position, the lower surface of the pressing head 32 contacts the upper surface of the second pole piece 202. The surface of the positioning assembly 20 contacting the pole piece unit 203 includes 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.

[0067] The support surface 11, the lower surface of the pressing head 32 and the surface of the positioning assembly 20 contacting the pole piece unit 203 are all smooth surfaces. After the pressing is completed, the tightly pressed pole piece unit 203 is not easy to adhere to the pressing device 100, so that the demolding can be better realized, and the stable attachment of the pole piece unit 203 after the pressing is completed can be ensured.

[0068] In some embodiments, the pressing device 100 further comprises a first heating member (not shown in the figure), which is arranged on at least one of the support 10, the positioning assembly 20 and the first pressure assembly 30, and is used for heating the pole piece unit 203.

[0069] Specifically, the first heating member refers to a component capable of heating the pole piece unit 203. The first heating member can be, but is not limited to, a thermocouple. The thermocouple is arranged on at least one of the support member 10, the positioning assembly 20, and the pressure head 32, so that the thermocouple can be in contact with the first pole piece 201 or the second pole piece 202 during the pressing process, and heat the first pole piece 201, the electrolyte layer, and the second pole piece 202. In this way, the yield strength of the first pole piece 201, the electrolyte layer, and the second pole piece 202 can be reduced, so that the first pole piece 201, the electrolyte layer, and the second pole piece 202 are more easily pressed and densified.

[0070] In some embodiments, the heating temperature of the first heating member is 25℃-2000℃. And / or, the pressure range of the first pressure assembly 30 applied to the pole piece unit 203 is 500t-10000t.

[0071] The heating temperature of the first heating member affects the structure and yield strength of the first pole piece 201, the electrolyte layer, and the second pole piece 202. Specifically, too high a temperature can easily cause side reactions of the electrolyte, damaging the structure of the electrolyte layer. Too low a temperature cannot effectively improve the yield strength of the first pole piece 201, the electrolyte layer, and the second pole piece 202.

[0072] Therefore, the heating temperature of the first heating member is set to the above range. As a specific embodiment, the heating temperature of the first heating member can be set to 100℃-300℃, which can further improve the heating effect.

[0073] Further, the pressure of the first pressure assembly 30 affects the structure of the first pole piece 201, the electrolyte layer, and the second pole piece 202, wherein too small a pressure is not conducive to the densification of the first pole piece 201, the electrolyte layer, and the second pole piece 202, and too large a pressure can cause the problem of particle pulverization of the first pole piece 201, the electrolyte layer, and the second pole piece 202.

[0074] Based on this, the pressure of the first pressure assembly 30 is set to the above range. As a specific embodiment, the pressure range of the first pressure assembly 30 can be set to 1000t-3000t, which can further improve the pressing effect.

[0075] Through the above structure, the heating temperature of the first heating member and the pressure of the first pressure assembly 30 are effectively controlled, thereby effectively improving the yield strength of the first pole piece 201, the electrolyte layer, and the second pole piece 202, and enabling the first pole piece 201, the electrolyte layer, and the second pole piece 202 to be more stably and more closely attached.

[0076] In some embodiments, the pressing device 100 further comprises a second pressure assembly (not shown in the figure) having a containing space for containing the at least two polar piece units 203 arranged in a stack, and the second pressure assembly is configured to be capable of applying pressure to each polar piece unit 203 in the containing space to form the electrode assembly 200.

[0077] Specifically, after the first polar piece 201, the electrolyte layer, and the second polar piece 202 are pressed by the support 10, the positioning assembly 20, and the first pressure assembly 30 to form a plurality of polar piece units 203, the plurality of polar piece units 203 can be arranged in a stack in the containing space of the second pressure assembly in sequence, and then the plurality of polar piece units 203 are pressed by the second pressure assembly to finally form the electrode assembly 200.

[0078] In this way, the electrode assembly 200 is divided into a plurality of polar piece units 203, and each polar piece unit 203 is subjected to a pressing process, i.e., each polar piece unit 203 has a compact and stable structure. In this way, the plurality of polar piece units 203 are arranged in a stack in sequence, and then pressed by the second pressure assembly, so that the electrode assembly 200 can be formed more stably and more quickly.

[0079] In some embodiments, the second pressure assembly is configured as a flat pressing assembly or an isostatic pressing assembly.

[0080] Specifically, the second pressure assembly can press in a flat pressing manner or an isostatic pressing manner. Since each polar piece unit 203 has a stable structure, the second pressing can more efficiently and stably form the structure of the electrode assembly 200.

[0081] It should be noted that the second pressure assembly can use the existing flat pressing or isostatic pressing device, which can achieve the pressing between the plurality of polar piece units 203 arranged in a stack, so as to smoothly form the electrode assembly 200, which will not be described here.

[0082] In some embodiments, the pressure range of the flat pressing assembly is 20t-500t. And / or, the pressure range of the isostatic pressing assembly is 50MPa-1000MPa.

[0083] When the flat pressing is used to press the plurality of polar piece units 203 arranged in a stack for the second time, the pressure range can be set to 20t-500t. When the isostatic pressing is used to press the plurality of polar piece units 203 arranged in a stack for the second time, the pressure range can be set to 50MPa-1000MPa.

[0084] Therefore, because each pole piece unit 203 has a relatively dense and stable structure due to independent pressing, the second pressure assembly can use a smaller pressure when performing the second pressing, which can effectively reduce the probability of overhang area crushing again and improve the pressing efficiency on the basis of assembling each pole piece unit 203 to form the electrode assembly 200.

[0085] In some embodiments, the pressing device 100 further comprises a second heating member (not shown in the figure) arranged on the second pressure assembly, which is used to heat each pole piece unit 203 in the containing space. The heating temperature of the second heating member is 25-300°C.

[0086] Specifically, the second heating member is arranged on the second pressure assembly, which can heat each pole piece unit 203 during the second pressing of the plurality of pole piece units 203 arranged in layers, thereby reducing the yield strength of each pole piece unit 203, so that each pole piece unit 203 can be more closely attached.

[0087] Further, the heating temperature of the second heating member can be set to 25-300°C, and as a specific embodiment, the heating temperature can be set to 50-150°C. In this way, the yield strength of the pole piece unit 203 can be better improved.

[0088] Through the above structure, the second pressing of each pole piece unit 203 arranged in layers can make each pole piece unit 203 more closely attached, and smoothly form the electrode assembly 200.

[0089] Based on the same concept as the above-mentioned pressing device 100, the present application also provides a battery production equipment comprising the above-mentioned pressing device 100.

[0090] According to one or more embodiments, the electrolyte layer is coated on one side surface of the first pole piece 201 when the present application is used. At the same time, the first positioning block 21 is first arranged on the support surface 11, and then the first pole piece 201 is arranged in the first positioning space of the first positioning block 21, so that the electrolyte layer is arranged upward.

[0091] Further, the second positioning block 22 is arranged on the first positioning block 21, at this time, the second positioning block 22 can press the overhang area of the first pole piece 201. Then the second pole piece 202 is arranged in the second positioning space of the second positioning block 22, so that the second pole piece 202 is arranged in layers above the electrolyte layer.

[0092] The first pole piece 201, the electrolyte layer and the second pole piece 202 are heated by the first heating member. After a certain time of heating, the pressure head 32 is moved to the pressing position, at this time, the lower surface of the pressure head 32 presses on the second pole piece 202, under the pressure of the pressure head 32, the first pole piece 201, the electrolyte layer and the second pole piece 202 are tightly attached to each other, and densification is realized.

[0093] After a certain time of pressing, the pressure head 32 is moved from the pressing position to the separation position, so as to take out the pole piece unit 203 formed by pressing.

[0094] The above operation is repeated, and a plurality of pole piece units 203 are obtained. The plurality of pole piece units 203 are stacked in the accommodation space, and then the second pressure assembly is used to press the plurality of stacked pole piece units 203 for the second time, so as to make the pole piece units 203 tightly attached to each other, and the electrode assembly 200 is formed.

[0095] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, it should be considered that they are within the scope of the present application.

[0096] The above-mentioned embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A pressurizing device characterized by comprising: A pressing device for pressing an electrode assembly of a solid-state battery cell, the electrode assembly comprising a first electrode tab, a second electrode tab, and an electrolyte layer, a length of the first electrode tab being greater than a length of the second electrode tab, and / or a width of the first electrode tab being greater than a width of the second electrode tab; wherein the electrolyte layer is fixed to a side surface of the first electrode tab; The pressing device comprises: a support member having a support surface for supporting the first electrode tab, the support surface being in contact with a side surface of the first electrode tab facing away from the electrolyte layer; a positioning assembly disposed on the support surface and defining a first positioning space for positioning the first electrode tab and a second positioning space for positioning the second electrode tab, the first positioning space and the second positioning space being disposed along a stacking direction of the first electrode tab and the second electrode tab, and the first positioning space being located between the support surface and the second positioning space; and a first pressure assembly movably disposed on a side of the positioning assembly facing away from the support member along the stacking direction, for applying pressure to the first electrode tab and the second electrode tab in the positioning assembly to form a stacked electrode tab unit.

2. The pressurizing device according to claim 1, characterized by The positioning assembly comprises a first positioning block and a second positioning block disposed above the first positioning block, the first positioning block enclosing the first positioning space, and the second positioning block enclosing the second positioning space.

3. The pressurizing device according to claim 1, characterized by The first pressure assembly comprises a pressure block and a pressure head 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 tab unit, and a separation position located outside the second positioning space.

4. The pressurizing device according to claim 3, characterized by The support surface, the side surface of the pressure head facing the positioning assembly, and the surface of the positioning assembly in contact with the electrode tab unit are all configured as smooth surfaces.

5. The pressurizing device according to claim 1, characterized by The pressing device further comprises a first heating member disposed on at least one of the support member, the positioning assembly, and the first pressure assembly, for heating the electrode tab unit.

6. The pressurizing device according to claim 5, characterized by The heating temperature of the first heating member is 25°C to 2000°C; and / or the pressure applied by the first pressure assembly to the electrode tab unit ranges from 500t to 10000t.

7. The pressurizing device according to claim 1, wherein The pressing device further comprises a second pressure assembly having an accommodation space for accommodating at least two stacked electrode tab units, the second pressure assembly being configured to apply pressure to each of the electrode tab units in the accommodation space to form the electrode assembly.

8. The pressurizing device according to claim 7, characterized by The second pressure assembly is configured as a flat pressing assembly or an isostatic pressing assembly.

9. The pressurizing device according to claim 8, characterized by The pressure of the flat pressing assembly ranges from 20t to 500t; and / or the pressure of the isostatic pressing assembly ranges from 50MPa to 1000MPa.

10. The pressurizing device according to claim 7, characterized by The pressing device further comprises a second heating member disposed on the second pressure assembly, for heating each of the electrode tab units in the accommodation space; wherein the heating temperature of the second heating member is 25°C to 300°C.

11. A battery production apparatus characterized by comprising: The pressurizing device according to any one of claims 1 to 10.

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