Isostatic pressing device suitable for batch processing of solid-state batteries

Abstract

The utility model discloses an isostatic pressing device suitable for batch processing of solid-state batteries. The isostatic pressing device comprises the following components: a plurality of mold assemblies, wherein each mold assembly comprises a bottom mold plate for placing and positioning a workpiece to be pressed and a limiting strip; the box body comprises a top plate, a bottom plate, a rear plate and a front plate; each pressure applying element is fixedly connected to the top plate and is provided with a movable acting end penetrating through the top plate into the box body; the workbench is fixedly connected to the bottom plate of the box body and is provided with stations corresponding to the multiple mold assemblies; the pressure applying plate is arranged opposite to the workbench and is connected with the acting end of the pressure applying element; one end of the guide column is fixedly connected with the top plate, the other end of the guide column is fixedly connected with the bottom plate, and the guide sleeve is arranged on the guide column in a sliding mode and fixedly connected with the pressure applying plate, so that the pressure applying plate can be driven by the pressure applying element to move in the axial direction of the guide column; a working space is formed between the pressing plate and the working station of the working table, and the mold assembly is placed on the working station of the working table.

Description

Technical Field

[0001] The utility model relates to a battery manufacturing process and related equipment, and more particularly to an isostatic pressing device suitable for batch processing of solid-state batteries. Background Art

[0002] With the rapid advancement of technology, the battery industry is also constantly progressing and innovating. The emergence of lithium-ion batteries, in particular, has significantly boosted the development of electric vehicles, portable electronic devices, and other fields. However, as battery performance requirements continue to increase, traditional manufacturing processes are no longer able to meet market demands. Therefore, researchers are constantly exploring new battery manufacturing technologies to meet the demands of the future energy sector.

[0003] Patent No. CN 208589491U provides an electrode sheet processing device that indirectly isostatically presses the electrode sheet within a sealed bag by squeezing liquid within a sealed container. The compression medium is liquid, which can easily contaminate the workpiece. The isostatic pressing devices disclosed in Patent Nos. CN 210721171U, CN 219163450U, and CN117616611A are only suitable for single battery cells. Currently, there are no isostatic pressing devices suitable for batch processing of batteries.

[0004] Against this backdrop, the applicant proposed an isostatic pressing device suitable for batch processing of solid-state batteries. This device can apply pressure to multiple cells simultaneously through mechanical pressure, while maintaining consistent cell deformation and ensuring product consistency. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide an isostatic pressing device which is environmentally friendly, efficient and pollution-free and suitable for batch processing of solid-state batteries, so as to achieve high quality requirements in the battery production process.

[0006] The isostatic pressing equipment described in this utility model aims to overcome the shortcomings of traditional liquid pressure methods, achieving an environmentally friendly, efficient, and low-cost battery manufacturing process. The battery cell components undergoing pressure are not directly exposed to hydraulic pressure, resulting in no pollution to the environment or the product, significantly reducing production costs and maintenance. Furthermore, the isostatic pressing device can process multiple battery cells in batches, improving production efficiency and product quality.

[0007] The purpose of the utility model can be achieved through the following technical solutions.

[0008] The utility model provides an isostatic pressing device suitable for batch processing of solid-state batteries, which comprises the following components: a plurality of mold assemblies, each mold assembly comprising: a bottom template for placing a workpiece to be pressed and a limit bar for positioning the workpiece to be pressed; a box body, comprising a top plate, a bottom plate, a back plate and a front plate, the top plate, the back plate, the bottom plate and the front plate forming a rectangular equipment frame; at least one pressure element, each pressure element being fixedly connected to the top plate and having a movable active end that passes through the top plate to the box body; a workbench, fixedly connected to the bottom plate of the box body, having workstations corresponding to the plurality of mold assemblies; a pressure plate, arranged opposite to the workbench and connected to the active end of the pressure element; a guide column and a guide sleeve, one end of the guide column being fixedly connected to the top plate and the other end being fixedly connected to the bottom plate, the guide sleeve being slidably arranged on the guide column and fixedly connected to the pressure plate, so that the pressure plate can move axially along the guide column under the drive of the pressure element; a working space is formed between the pressure plate and the workstation of the workbench, and the mold assembly is placed on the workstation of the workbench.

[0009] Optionally, the box is a closed structure, which can provide an inert gas environment or a vacuum environment according to the needs of the workpiece to be pressed.

[0010] Optionally, the box body further comprises a connection hole for supplying an inert gas or providing a vacuum environment.

[0011] Optionally, a door assembly is provided on either or both sides of the box body, which can be opened to form a channel for taking in and placing workpieces to be pressed.

[0012] Optionally, the front plate of the box is provided with a front viewing window assembly for observing the status of the workpiece inside the box.

[0013] Optionally, the pressure element is a plurality of pressure elements, and the pressure plate is connected to at least one of the plurality of pressure elements via a pressure flange.

[0014] Optionally, the isostatic pressing device includes multiple groups of guide pillars and guide sleeves.

[0015] Optionally, at least one of the workbench and the pressure plate comprises a heating element.

[0016] Optionally, the mold assembly further includes a movable template, a mold guide column, and a mold guide sleeve; one of the bottom template and the movable template is fixedly connected to the mold guide column, and the other is fixedly connected to the mold guide sleeve, so that the movable template and the bottom template can move relative to each other along the axis of the guide column.

[0017] Optionally, the mold assembly further includes an elastic element, which is arranged between the movable template and the bottom template. When the mold assembly is not subjected to external force, a working space is formed between the movable template and the bottom template under the action of the elastic element.

[0018] Optionally, the workpiece to be pressed is a cell of a solid-state battery.

[0019] The operating steps of the isostatic pressing device provided by the utility model are as follows:

[0020] S1: Place the workpiece to be pressed (battery core) into the mold assembly and use the limit bar to limit the workpiece to be pressed;

[0021] S2: Open the door assembly of the isostatic pressing equipment, place multiple mold assemblies containing workpieces to be pressed onto the workbench inside the isostatic pressing equipment in sequence, and close the door assembly;

[0022] S3: Set the internal environment of the equipment (vacuum or inert gas environment), pressure and holding time;

[0023] S4: The pressure function is activated, and the pressure element drives the pressure plate to apply pressure to the mold assembly, thereby stably and evenly applying pressure to the multiple workpieces to be pressed in the mold assembly;

[0024] S5: After the set time is reached, the pressure element is closed to restore the atmosphere in the box to an operable state;

[0025] S6: Open the door assembly on the isostatic pressing equipment, take out the mold assembly, and take out the workpiece (battery cell) in the mold assembly to obtain the finished product.

[0026] Optionally, the applied pressure is 5-90 MPa, preferably 10-50 MPa.

[0027] Optionally, the pressure maintenance time is 1-120 min, preferably 5-60 min.

[0028] The technical solution of the utility model has at least one of the following advantages:

[0029] 1. Environmental protection and pollution-free: During the pressing process of the isostatic pressing device provided by the utility model, no liquid such as hydraulic oil or water is required to contact the workpiece to be pressed, thus avoiding environmental pollution problems and being conducive to green production.

[0030] 2. Batch production: Multiple pressure elements are connected in parallel to a pressure plate, and the pressure plate is used to evenly apply pressure to multiple workpieces (or mold components) to be pressed. Batch operation has high production efficiency.

[0031] 3. Simple operation and low cost: The design structure of this utility model is simple and easy to operate, and only requires power supply, which reduces production costs. At the same time, since no additional liquid medium is required, the maintenance cost is also relatively low.

[0032] 4. Efficient and stable: By setting the appropriate pressure and holding time, effective pressurization of battery electrodes or solid-state batteries can be achieved, improving product quality and performance. At the same time, the pressure plate applies pressure to multiple workpieces simultaneously, ensuring consistent deformation of the workpieces and ensuring the stability of the production process.

[0033] 5. Wide range of applications: Since the isostatic pressing device of the utility model does not require a liquid medium, it can be widely used in the production process of various types of battery pole pieces or solid-state batteries, thereby improving the versatility and practicality of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of an embodiment of the isostatic pressing device of the present utility model.

[0035] Figure 2 yes Figure 1 Schematic diagram of the medium static pressure device with the front panel hidden.

[0036] Figure 3 yes Figure 2 Front view of the medium static pressure device.

[0037] Figure 4 It is a schematic diagram of a specific embodiment of the mold assembly in the present utility model.

[0038] Figure 5 yes Figure 4 Schematic diagram of the middle die assembly after the workpiece to be pressed is placed in it.

[0039] Figure 6 yes Figure 5 Front view of the mold assembly shown.

[0040] Figure 7 yes Figure 4 Schematic diagram of the mold assembly during the pressure application process.

[0041] Figure 8 yes Figure 7 Front view of the mold assembly.

[0042] Description of the figure number:

[0043] 100-Mold assembly; 110-Bottom template; 120-Movable template; 130-Limiting bar; 140-Mold guide pin; 150-Mold guide sleeve; 160-Elastic element; 170-Screw; 200-Workpiece (battery cell); 300-Isostatic pressing device; 310-Box; 311-Top plate; 312-Bottom plate; 313-Front plate; 314-Rear plate; 320-Pressure element; 330-Pressure flange; 340-Pressure plate; 350-Workbench; 360-Guide pin; 370-Guide sleeve; 380-Door assembly; 381-Door; 382-Door window; 383-Hinge; 384-Quick release assembly; 390-Front window assembly. DETAILED DESCRIPTION

[0044] The following describes specific embodiments of the present invention. It should be understood that those skilled in the art can conceive of various other embodiments and modify them based on the teachings of this disclosure without departing from the scope or spirit of the present invention. Therefore, the following specific embodiments are not intended to be limiting.

[0045] The utility model provides an isostatic pressing device suitable for batch processing of solid-state batteries, the isostatic pressing device comprising the following components: a workbench having a plurality of workstations for placing workpieces to be pressed; a pressure element for generating the force required by the device; a pressure plate connected to the pressure element for transmitting the force generated by the pressure element to the workpiece to be pressed; a box body serving as a device frame, providing space for installing the pressure element, the workbench and the pressure plate, the pressure element and the workbench being fixedly connected to the box body respectively; a guide post and a guide sleeve, the guide post being fixedly connected to the box body, the guide sleeve being slidably arranged on the guide post and fixedly connected to the pressure plate; a working space is formed between the pressure plate and the workbench, the workpiece to be pressed is placed in the working space on the workbench.

[0046] A specific embodiment of the isostatic pressing device of the present invention suitable for batch isostatic pressing of battery cells will be described below with reference to the accompanying drawings.

[0047] like Figures 1 to 3As shown, the isostatic pressing device of the present invention includes: a box body 310, which is composed of a top plate 311, a bottom plate 312, a rear plate 314, and a front plate 313; the top plate 311 and the bottom plate 312 are arranged relatively parallel to each other, with the top plate 311 located above the bottom plate 312; the rear plate 314 and the front plate 313 are arranged relatively parallel to each other, but are arranged as a whole perpendicular to the top plate 311 and the bottom plate 312, and the top plate 311, the rear plate 314, the bottom plate 312, and the front plate 313 form a rectangular parallelepiped frame, i.e., the box body 310. There are multiple guide posts 360, each of which is arranged perpendicular to the top plate 311, one end of each guide post 360 is fixedly connected to the top plate 311, and the other end is fixedly connected to the bottom plate 312, and a guide sleeve 370 is provided on each guide post 360, and the guide sleeve 370 can move axially along the guide post 360. There is at least one pressure element 320, each disposed outside the housing 310 and fixedly connected to the top plate 311. The active end of the pressure element 320 extends through the top plate 311 into the housing 310. A pressure plate 340 is also disposed within the housing 310. The pressure plate 340 is fixedly connected to the pressure element 320 via a pressure flange 330 and is also fixedly connected to a guide sleeve 370, enabling the pressure plate 340 to move axially along the guide post 360 under the drive of the pressure element 320. A workbench 350 is fixedly disposed on the bottom plate 312 on one side of the interior of the housing 310. A working space is formed between the pressure plate 340 and the workbench 350. After the mold assembly 100 is placed on the workbench 350 inside the box 310, the pressure element 320 drives the pressure plate 340 to apply pressure to the multiple mold assemblies 100 on the workbench 350, thereby indirectly completing uniform pressure on the workpiece to be pressed.

[0048] In this embodiment, both ends of the box 310 may also include door assemblies 380, each comprising a door 381, a door window 382, ​​a hinge 383, and a quick-release assembly 384. The door window 382 is fixedly connected to the door 381 and is used to observe the interior of the box 310. A portion of the hinge 383 is fixedly connected to the door 381, and another portion is fixedly connected to the rear panel 314 of the box 310. The hinge 383 allows the door 381 to be opened and closed. One end of the quick-release assembly 384 is fixedly connected to the door, and the other end is fixedly connected to the front panel 313 on the box body 310. When the door 381 is in a closed state, the quick-release assembly 384 can be used to lock the door 381 and the box body 310, so that the box body 310 is in a sealed state; when the quick-release assembly 384 is in an unlocked state, the door 381 is opened, so that the box body 310 is in an open state, which facilitates the placement of the mold assembly 100 or the workpiece 200 into the box body 310.

[0049] In this embodiment, optionally, a front window assembly 390 can be provided on the front panel 313 of the box body 310. The front window assembly 390 includes a transparent but closed observation window, through which the conditions inside the box body 310 and the working status of each component can be observed from the outside of the box body 310.

[0050] In this embodiment, a heating element may optionally be provided within at least one of the workbench 350 and the pressure plate 340, so that the workbench 350 has heating and temperature control capabilities and can heat the mold assembly 100 to a set temperature. A temperature sensor may also be provided along with the heating element, and the temperature sensor may be a thermocouple or a thermocouple.

[0051] like Figure 4 The figure shows the mold assembly 100 of the present invention. In this embodiment, the mold assembly 100 includes: a bottom template 110, a movable template 120, a limit bar 130, a mold guide post 140, a mold guide sleeve 150, an elastic element 160 and a screw 170. One end of the mold guide post 140 is fixedly connected to the movable template 120 by a screw 170, and the other end is movably connected to the mold guide sleeve 150, and the mold guide sleeve 150 is fixedly connected to the bottom template 110. This allows the movable template 120 to move relative to the bottom template 110 along the axial direction of the mold guide post 140. An elastic element 160 is also provided between the movable template 120 and the bottom template 110. Under the action of the elastic element 160, the movable template 120 maintains a specific distance relative to the bottom template 110 when no external pressure is applied, so that an accommodating space is formed between the movable template 120 and the bottom template 110. A limit bar 130 is further provided on the bottom template 110 . The position of the limit bar 130 is set according to the size of the workpiece (battery cell) 200 . The limit bar 130 can position the workpiece 200 to prevent the workpiece 200 from moving freely.

[0052] In this embodiment, the elastic element 160 is sleeved on the mold guide pillar 140 . In other embodiments, the elastic element 160 may be directly disposed between the movable template 120 and the bottom template 110 .

[0053] like Figure 5 and Figure 6 The figure shows the state of the mold assembly 100 of the present invention after the workpiece 200 is placed inside. Figure 6 for Figure 5 Front view of . Figure 5 and Figure 6 The state shown is after the workpiece 200 is placed, but the mold assembly 100 is not subjected to external pressure. At this time, the workpiece 200 is positioned by the limit bars 130 and fixed to the bottom mold plate 110. There is a certain distance between the movable mold plate 120 and the workpiece 200, and they are not in contact with each other.

[0054] like Figure 7 and Figure 8 The figure shows the state of the mold assembly 100 of the present invention when a workpiece 200 is placed inside the mold assembly 100 and the mold assembly 100 is subjected to external pressure. Figure 8 for Figure 7 As can be seen from the figure, when the mold assembly 100 is subjected to external pressure, the movable template 120 moves toward the bottom template 110 along the axis of the mold guide pillar 140 until it is in close contact with the workpiece 200. The external pressure is indirectly transmitted to the workpiece 200, completing the isostatic pressing of the workpiece 200.

[0055] The operating steps of the isostatic pressing device 300 of the present invention are as follows:

[0056] S1: Place the workpiece (battery cell) 200 to be pressed into the mold assembly 100 and use the limiting bar 130 to limit the workpiece 200 to be pressed;

[0057] S2: Open the door assembly 380 of the isostatic pressing apparatus 300, place the plurality of mold assemblies 100 containing the workpieces 200 to be pressed onto the workbench 350 inside the isostatic pressing apparatus 300 in sequence, and close the door assembly 380 to close the isostatic pressing apparatus 300;

[0058] S3: Set the internal environment of the equipment (vacuum or inert gas environment), pressure and holding time;

[0059] S4: activating the pressure function, the pressure element 320 drives the pressure plate 340 to apply pressure to the mold assembly 100, and stably and evenly applies pressure to the multiple workpieces 200 to be pressed in the mold assembly 100;

[0060] S5: After the set time is reached, the pressure element 320 is closed to restore the atmosphere in the box to an operable state;

[0061] S6: Open the door assembly 380 on the isostatic pressing device 300, take out the mold assembly 100, and take out the workpiece (battery cell) 200 in the mold assembly 100 to obtain a finished product.

[0062] In this embodiment, when the door assembly 380 of the isostatic pressing apparatus 300 is in a closed state, the interior of the housing 310 is in a closed environment, thereby providing an inert gas environment or a vacuum environment for the workpiece 200 to be pressed. In certain other embodiments, when the workpiece 200 to be pressed does not require a special environment, the housing 310 can be simplified to an open frame structure.

[0063] In this embodiment, a heating element is disposed inside at least one of the working platform 350 and the pressure plate 340. In some other embodiments, when heating is not required, the heating element may not be included.

[0064] In this embodiment, the mold assembly 100 is a relatively complete embodiment. In some other embodiments, the mold assembly 100 may also only include the necessary bottom mold plate 110 and the limiting strip 130 .

[0065] As some optional embodiments, the mold assembly 100 may also be composed of a bottom mold plate 110, a limiting bar 130, a movable mold plate 120, a mold guide pin 140, and a mold guide sleeve 150. The mold guide pin 140 is fixedly connected to either the bottom mold plate 110 or the movable mold plate 120, and the other end of the mold guide pin 140 is movably connected to the other mold plate through the mold guide sleeve 150.

[0066] In this embodiment, the isostatic pressing apparatus 300 further includes an inert gas control system (not shown) and a vacuum control system (not shown). In other embodiments, the two systems may be selected based on the specific use conditions of the workpiece 200 to be pressed. For example, in some embodiments, only one of the inert gas control system and the vacuum control system may be included, or neither.

[0067] In certain other embodiments, the isostatic pressing apparatus 300 may further include a control system (not shown) for controlling the isostatic pressing apparatus 300. The control system may include a pressure control system, a temperature control system, and a safety control system. The pressure control system monitors the pressure applied by the pressure element 320 in real time and adjusts it as needed. The pressure control system also rapidly responds to pressure fluctuations in the pressure element 320 and precisely controls the output pressure of the pressure element 320 to ensure processing accuracy. The temperature control system heats or cools the worktable 350 or the pressure plate 340, which are equipped with heating elements, to ensure that the temperature remains within an appropriate range during the isostatic pressing process. The safety system monitors the inert gas pressure, vacuum level, temperature, gas composition, and moisture content within the chamber 310 of the isostatic pressing apparatus 300 in real time and issues an alarm if an anomaly occurs. The safety system also provides emergency alarms or automatic emergency response to prevent accidents.

[0068] The isostatic pressing device of this utility model can achieve a more even distribution of active materials within the battery, thereby increasing the battery's energy density. It can ensure that the active materials within the battery always maintain good contact during the charge and discharge process, thereby increasing the battery's cycle life. It can also effectively eliminate internal stress in the battery, thereby reducing the risk of safety issues such as short circuits and thermal runaway during use. In addition, it can ensure that multiple battery cells processed in batches have consistent deformation, thereby improving battery consistency.

[0069] Although the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope defined by the claims.

Claims

1. An isostatic pressing device suitable for batch processing of solid-state batteries, characterized in that: The isostatic pressing device comprises the following components: Multiple mold assemblies, each mold assembly includes: a bottom template for placing the workpiece to be pressed and a limiting strip for positioning the workpiece to be pressed; The box body includes a top plate, a bottom plate, a rear plate and a front plate, which form a rectangular equipment frame; At least one pressure element, each pressure element is fixed to the top plate and has a movable active end extending through the top plate into the box body; A workbench, fixedly connected to the bottom plate of the box body, has workstations corresponding to the plurality of mold assemblies; a pressure plate, disposed opposite to the workbench and connected to the active end of the pressure element; A guide post and a guide sleeve, wherein one end of the guide post is fixedly connected to the top plate and the other end is fixedly connected to the bottom plate. The guide sleeve is slidably disposed on the guide post and fixedly connected to the pressure plate, so that the pressure plate can move axially along the guide post under the drive of the pressure element; A working space is formed between the pressure plate and the workstation of the workbench, and the mold assembly is placed on the workstation of the workbench.

2. The isostatic pressing device according to claim 1, characterized in that The box body is a closed structure, and the box body also includes connection holes for supplying inert gas or providing a vacuum environment.

3. The isostatic pressing device according to claim 1, characterized in that The pressure element is a plurality of pressure elements, and the pressure plate is connected to at least one of the plurality of pressure elements via a pressure flange.

4. The isostatic pressing device according to claim 1, characterized in that Any one side or both sides of the box body are provided with a door assembly which can be opened to form a passage for taking in and placing workpieces to be pressed.

5. The isostatic pressing device according to claim 1, characterized in that The front plate of the box is provided with a front viewing window assembly for observing the status of the workpiece inside the box.

6. The isostatic pressing device according to claim 1, characterized in that The isostatic pressing device includes multiple groups of guide pillars and guide sleeves.

7. The isostatic pressing device according to claim 1, characterized in that At least one of the work table and the pressure plate includes a heating element.

8. The isostatic pressing device according to claim 1, characterized in that The mold assembly also includes a movable template, a mold guide column, and a mold guide sleeve; one of the bottom template and the movable template is fixedly connected to the mold guide column, and the other is fixedly connected to the mold guide sleeve, so that the movable template and the bottom template can move relative to each other along the guide column axis.

9. The isostatic pressing device according to claim 8, characterized in that The mold assembly further includes an elastic element, which is arranged between the movable template and the bottom template. When the mold assembly is not subjected to external force, a working space is formed between the movable template and the bottom template under the action of the elastic element.

10. The isostatic pressing device according to claim 1, characterized in that The workpiece to be pressed is a cell of a solid-state battery.

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