Battery pole piece film forming device

Abstract

The utility model belongs to the battery production technical field discloses a kind of battery pole piece film-forming device.The device includes first mould, second mould and vibration structure, first mould is equipped with cavity, second mould is equipped with convex part, convex part can extend into cavity and press solid powder material, to make solid powder material integrally formed as battery pole piece, vibration structure transmission connection is in first mould and / or second mould, and battery pole piece can be vibrated and separated with first mould and second mould.By the above setting, the film-forming process of battery pole piece dry process can be simplified, the thinning, slitting and cutting process of existing related technology is saved, so that solid powder material can be integrally formed as battery pole piece in cavity, effectively improve film-forming efficiency, also enhance the equipment economy and raw material utilization rate, also can reduce the phenomenon that battery pole piece is adhered on second mould and first mould, ensure the shape and size of battery pole piece intact.

Description

Technical Field

[0001] This utility model relates to the field of battery production technology, and in particular to a battery electrode film forming device. Background Technology

[0002] The lithium-ion battery market is currently booming, with solid-state batteries being a particularly hot sector. Dry-process battery electrode fabrication is a crucial step in solid-state battery manufacturing. Currently, the dry-process battery electrode fabrication method typically involves extruding material into a film using film-forming rollers, then feeding it into a thinning roller assembly for multiple thinning processes before winding it up. Finally, the rolled film undergoes secondary slitting and cutting to form individual battery electrodes. This method requires sequential film formation, thinning, slitting, and cutting processes, and its drawback is its excessive complexity, making it impossible to fabricate the electrode in a single step.

[0003] Based on the above situation, there is an urgent need for a battery electrode film forming device to address the shortcomings of existing technologies. Utility Model Content

[0004] The purpose of this utility model is to provide a battery electrode film forming device, which simplifies the film forming process of battery electrodes, improves film forming efficiency, equipment economy and raw material utilization, improves the demolding quality and yield of battery electrodes, and ensures production quality.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A battery electrode film forming apparatus includes: a first mold, a second mold, and a vibration structure. The first mold has a cavity for filling a solid powder to be pressed. The second mold has a protrusion that can extend into the cavity and press the solid powder to integrally form a battery electrode. The vibration structure is drivenly connected to the first mold and / or the second mold and can vibrate to separate the battery electrode from the first mold and the second mold.

[0007] Preferably, the vibration structure includes an ultrasonic transducer and an ultrasonic generator, one end of the ultrasonic transducer can be connected to one side of the first mold and / or the second mold, and the other end of the ultrasonic transducer can be connected to the ultrasonic generator.

[0008] Preferably, the vibration structure further includes an ultrasonic amplitude transformer, which can be connected between the first mold and the ultrasonic transducer to adjust the amplitude and frequency of the ultrasonic waves output by the ultrasonic transducer to a preset range.

[0009] Preferably, the vibration direction of the first mold and / or the second mold is parallel to the pressing direction of the first mold and the second mold.

[0010] Preferably, the inner surface of the cavity is coated with an anti-adhesion layer; and / or, the outer surface of the protrusion is coated with the anti-adhesion layer.

[0011] Preferably, the battery electrode film forming apparatus further includes a heating structure, which is thermally connected to the first mold.

[0012] Preferably, the heating structure includes a heat spreader plate and a heating unit. The heat spreader plate is attached to the first mold, and the heating unit is connected to the heat spreader plate to supply heat to the first mold through the heat spreader plate.

[0013] Preferably, the heating unit includes a power module and a heat-conducting wire, the heat-conducting wire being connected to one side of the heat spreader, and the two ends of the heat-conducting wire being connected to the positive and negative terminals of the power module, respectively.

[0014] Preferably, the heat-conducting wire is any one of the following: serpentine, loop-shaped, and grid-shaped.

[0015] Preferably, the first mold is a metal part; and / or, the second mold is a metal part.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This invention provides a battery electrode film forming apparatus, including a first mold, a second mold, and a vibration structure. The first mold has a cavity for filling with solid powder to be pressed. The second mold has a protrusion facing the first mold, which extends into the cavity and presses the solid powder to integrally form a battery electrode. This design simplifies the film forming process of the dry battery electrode process, eliminating the thinning, slitting, and cutting processes of existing related technologies. It allows the solid powder to be integrally formed into a battery electrode within the cavity, effectively improving film forming efficiency, while also enhancing equipment economy and raw material utilization. Furthermore, the vibration structure is driven and connected to the first mold and / or the second mold, thereby controlling the vibration of the first mold and / or the second mold to vibrate and separate the battery electrode from the first and second molds. This facilitates the removal of the battery electrode, reduces adhesion of the battery electrode to the second and first molds, ensures the integrity of the battery electrode's shape and size, and significantly reduces damage. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the battery electrode film forming device provided by this utility model;

[0019] Figure 2 This is a planar sectional view of the first mold and the second mold provided by this utility model when they are pressed together;

[0020] Figure 3 This is a schematic diagram showing the connection between the first mold and the vibration structure provided by this utility model;

[0021] Figure 4 This is a bottom view of the heating structure provided by this utility model.

[0022] In the picture:

[0023] 1. First mold; 11. Cavity; 2. Second mold; 21. Protrusion; 3. Vibration structure; 31. Ultrasonic transducer; 32. Ultrasonic amplitude transformer; 4. Heating structure; 41. Heat spreader; 421. Heat-conducting wire. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0025] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0028] The following is combined Figures 1 to 4 This invention describes the battery electrode film forming apparatus provided in the embodiments of the present invention. It should be noted that the battery electrode film forming apparatus can be used for dry-process battery electrodes in various types of batteries (such as liquid batteries, semi-solid batteries, solid batteries, etc.), especially solid-state batteries.

[0029] refer to Figures 1 to 3 As shown, the battery electrode film forming apparatus mainly includes a first mold 1, a second mold 2, and a vibration structure 3. The first mold 1 has a cavity 11 at its center, preferably a square cavity 11, which is used to fill the solid powder to be pressed, so that the solid powder is evenly spread on the bottom surface of the cavity 11. The solid powder can be pressed into a positive or negative battery electrode sheet. The dimensions (length and width) of the positive or negative battery electrode sheet are adapted to the dimensions (length and width) of the cavity 11. The thickness range of the battery electrode sheet is determined by the depth of the cavity 11, which is preferably 50-500 μm. The second mold 2 has a protrusion 21, which is adapted to the shape of the cavity 11 and is a square column. The protrusion 21 can extend into the cavity 11 to integrally press the solid powder into a battery electrode sheet. It should be noted in advance that, in this embodiment, the length of the cavity 11 is... Figure 3 The X-axis is parallel to the center, and the width dimension of cavity 11 is... Figure 3 The Y-axis is parallel to the center, and the depth dimension of cavity 11 is... Figure 3 The Z-axis direction is parallel.

[0030] In practical use, the first mold 1 is fixed on the worktable with the end opening of the cavity 11 facing upwards. The second mold 2 can be controlled to move up and down using a drive device. The protrusion 21 of the second mold 2 is set downwards and aligned with the cavity 11. After the solid powder to be pressed is filled into the cavity 11, the drive device can control the second mold 2 to descend and extend the protrusion 21 into the cavity 11, so that the solid powder can be pressed into shape. Through the above configuration, the film-forming process of the dry process of battery electrode sheets can be simplified, eliminating the thinning, slitting and cutting processes of existing related technologies. This allows the solid powder to be integrally formed into battery electrode sheets within the cavity 11, effectively improving film-forming efficiency, while also enhancing equipment economy and raw material utilization.

[0031] It should be noted that in other parallel embodiments, the shape of the cavity 11 is not limited to a square column. The shape and size of the cavity 11 can be designed according to the shape and size of the battery electrode sheet actually produced, and the depth of the cavity 11 can be designed according to the thickness requirements of the battery electrode sheet. The shape, size and protrusion height of the protrusion 21 can be adjusted accordingly to ensure the compatibility between the protrusion 21 and the cavity 11.

[0032] In addition, the first mold 1 provided in this embodiment is provided with a vibration structure 3. After the first mold 1 and the second mold 2 jointly press the solid powder into battery electrode sheets, the vibration structure 3 can control the vibration of the first mold 1 to separate and detach the battery electrode sheets from the first mold (specifically the cavity 11) and the second mold 2 (specifically the protrusion 21), thereby helping to remove the battery electrode sheets, reducing the phenomenon of battery electrode sheets adhering to the second mold 2 and the first mold 1, ensuring that the shape and size of the battery electrode sheets are intact, and greatly reducing the degree of damage.

[0033] Of course, it is understood that in some other embodiments, a vibration structure 3 may also be provided on the second mold 2. This would provide vibration force to the second mold 2, further improving the effect of separating and detaching the battery electrode from the protrusion 21. In some other parallel embodiments, depending on the shape or installation difficulty of the first mold 1 and the second mold 2, the vibration structure 3 may only be provided on the second mold 2. This ensures the installation stability of the vibration structure 3 and provides a vibration force for the battery electrode located between the protrusion 21 and the cavity 11 to detach. Therefore, those skilled in the art can choose any of the above embodiments according to actual working conditions, and this utility model is not limited in this regard.

[0034] It should be noted that when the battery electrode sheet manufactured above is a positive electrode sheet, the solid powder includes the positive electrode main material, an electronically conductive agent, and a binder. The positive electrode main material can be one or more of lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, lithium manganese oxide, lithium cobalt oxide, and lithium iron phosphate. When the battery electrode sheet manufactured above is a negative electrode sheet, the solid powder includes the negative electrode main material, an electronically conductive agent, and a binder. The negative electrode main material can be one or more of graphite, mesophase carbon microspheres, soft carbon, hard carbon, silicon carbide materials, and lithium titanate.

[0035] Specifically, in this embodiment, reference is made to... Figure 3 As shown, the vibration structure 3 includes an ultrasonic transducer 31 and an ultrasonic generator. One end of the ultrasonic transducer 31 is connected to one side of the first mold 1, and the other end of the ultrasonic transducer 31 is connected to the ultrasonic generator. The ultrasonic generator is preferably an ultrasonic power supply. The ultrasonic transducer 31 can convert the high-frequency electrical energy output by the ultrasonic power supply into mechanical vibration energy to achieve the vibration of the first mold 1.

[0036] Preferably, the vibration direction of the first mold 1 is parallel to the pressing direction of the first mold 1 and the second mold 2, so that the vibration direction of the first mold 1 can be effectively controlled along the Z-axis direction, while no vibration is generated in the X-axis and Y-axis directions. This can avoid the collision between the protrusion 21 and the inner wall of the cavity 11, reduce the risk of cracks and damage to the edge of the battery electrode due to the impact of the first mold 1, and effectively ensure the production quality of the battery electrode.

[0037] It is understood that in other parallel embodiments, when the second mold 2 is provided with a vibration structure 3, the vibration direction of the second mold 2 is also parallel to the pressing direction of the first mold 1 and the second mold 2, so as to avoid the phenomenon of the first mold 1 and the second mold 2 colliding in the X-axis direction and the Y-axis direction.

[0038] More specifically, in this embodiment, continued reference is made to... Figure 3 As shown, the vibration structure 3 also includes an ultrasonic amplitude transformer 32. One end of the ultrasonic amplitude transformer 32 is directly connected to the first mold 1, and the other end of the ultrasonic amplitude transformer 32 is directly connected to the ultrasonic transducer 31. The ultrasonic amplitude transformer 32 can adjust the vibration amplitude of the first mold 1, so that the first mold 1 can adjust the amplitude and frequency of the ultrasonic waves output by the ultrasonic transducer 31 to within a preset range, thereby providing stable vibration energy for the detachment and separation of the battery electrode.

[0039] It should be noted that the vibration structure 3 provided in this embodiment can be directly fixed to the first mold 1 by welding or other means, or it can be detachably connected to the first mold 1 by threaded connection, snap-fit ​​or other means. As long as the vibration structure 3 can be stably connected to the first mold 1 during use, the assembly method between the two is within the protection scope of this utility model, and this utility model does not limit it in this regard.

[0040] Example 2

[0041] In this embodiment, the battery electrode film forming apparatus of Embodiment 1 further includes a heating structure 4. The heating structure 4 is thermally connected to the first mold 1 and can transfer heat to the first mold 1, thereby increasing the overall temperature of the first mold 1 and raising the temperature of the second mold 2. By setting the heating structure 4, the overall temperature of the first mold 1 and the second mold 2 can be effectively increased, which enhances the fluidity of the binder in the solid powder after heating, making it easier to undergo plastic deformation. This helps reduce the springback of the battery electrode after pressing and effectively increases the compaction density of the battery electrode, resulting in better production quality of the battery electrode. Optionally, the temperature range is controlled between 25 and 100°C.

[0042] Preferably, refer to Figure 4As shown, in this embodiment, the heating structure 4 specifically includes a heat spreader plate 41 and a heating unit. The heat spreader plate 41 is attached to the first mold 1, and the heating unit is located on the side of the heat spreader plate 41 away from the first mold 1 and is heat-transferringly connected to the heat spreader plate 41. This allows the heat generated by the heating unit to be transferred to the heat spreader plate 41 and then to the first mold 1. Since the bottom wall of the cavity 11 is parallel to the bottom of the first mold 1, the cavity 11 in the first mold 1 is kept uniformly heated and the temperature rise is stable, which can improve the production quality of the battery electrode to a certain extent.

[0043] More specifically, in this embodiment, the heating unit includes a power module and a heat-conducting wire 421. The heat-conducting wire 421 is connected to one side of the heat spreader 41, and its two ends are respectively connected to the positive and negative terminals of the power module. Current can be supplied to both sides of the heat-conducting wire 421 through the power module for overall heating. The heating unit has a simple structure, and the power module can precisely control the heating power of the heat-conducting wire 421 by adjusting the current according to the required heating temperature. This allows it to meet the heating temperature requirements in different scenarios, with a fast response speed, ensuring efficient and rapid heating.

[0044] Preferably, in one embodiment of this invention, the heat-conducting wire 421 is arranged in a serpentine pattern on the back of the heat spreader 41 so that the surface of the heat spreader 41 can completely fit with the first mold 1, ensuring the heat conduction effect. At the same time, the serpentine path increases the contact length and area between the heat-conducting wire 421 and the back of the heat spreader 41, and its shape helps to distribute heat more evenly throughout the entire area of ​​the heat spreader 41, thereby further improving the heat conduction efficiency and temperature uniformity.

[0045] It is understood that in other alternative embodiments of this example, the heat-conducting wire 421 can also be in the form of a spiral or a grid. The spiral-shaped heat-conducting wire 421 has a larger path coverage area, and heat can be evenly diffused from the center to the outer periphery along the spiral path, providing a better heating effect on the cavity 11 located at the center of the first mold 1. The grid-shaped (mesh-like) heat-conducting wire 421 also has a better uniform temperature and heat conduction effect. At the same time, the mesh structure helps to enhance the local rigidity of the heat spreader 41, reduce the deformation of the heat spreader 41, and reduce the risk of poor fit with the first mold 1. Therefore, those skilled in the art can select the specific topology of the heat-conducting wire 421 on the heat spreader 41 according to the actual working conditions, and this utility model is not limited in this regard.

[0046] It should be noted that in other parallel embodiments, the heating structure 4 can be detachably connected to the first mold 1. This way, the heating structure 4 only needs to be assembled onto the first mold 1 when in use, and can be returned to its original position for storage when not in use, making it convenient to use. At the same time, it can reduce the weight of the first mold 1 and improve the flexibility of the battery electrode film forming device.

[0047] In this embodiment, both the first mold 1 and the second mold 2 are metal parts, which makes the thermal conductivity of the first mold 1 and the second mold 2 better. During the film formation process, the first mold 1 and the second mold 2 can uniformly heat the solid powder from both sides, avoiding the situation where the battery electrode is heated unevenly on both sides during the molding process, which affects the compaction effect and helps to further improve the molding quality of the battery electrode.

[0048] Preferably, the first mold 1 can be made of copper or steel, and the second mold 2 can be made of copper or steel. It not only has good thermal conductivity, but also has the advantages of wear resistance and resistance to extrusion deformation, resulting in stronger stability and longer service life.

[0049] Optionally, in this embodiment, both the inner surface of the cavity 11 and the outer surface of the protrusion 21 are coated with an anti-adhesion layer (not shown in the figure). The thickness of the anti-adhesion layer lining the cavity 11 is 5-10 μm, for example, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, or 10 μm. The thickness of the anti-adhesion layer applied to the outer surface of the protrusion 21 is 5-10 μm, for example, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, or 10 μm. The anti-adhesion layer can prevent solid powder from adhering to the inner wall of the cavity 11 and to the outer surface of the protrusion 21. The anti-adhesion layer can be a Teflon (polytetrafluoroethylene) coating, a nano-ceramic coating, etc., and this utility model is not limited to this.

[0050] Working principle: For example, the first mold 1 has a cavity 11 with a length of 100mm, a width of 75mm, and a depth of 350mm. Solid powder for forming the negative electrode sheet of the battery is added into the cavity 11, with a total weight of 1.1625g, and the cavity 11 is filled completely. After filling, the heating structure 4 is activated to heat the first mold 1 to 85℃. Then, the second mold 2 is pressed down towards the first mold 1. The protrusion 21 of the second mold 2 has a thickness of 250mm, and the pressing pressure of the second mold 2 is 1.0MPa, which is maintained for 3 minutes. After compaction and after the first mold 1 and the second mold 2 are fully pressed in, the second mold 2 is lifted upwards. During the lifting process, the vibration structure 3 is activated, which drives the first mold 1 and the second mold 2 to vibrate and maintains the vibration frequency between 100-500Hz for a preset time. Once the second mold 2 has fully lifted, a formed electrode diaphragm will be obtained in the cavity 11 of the first mold 1. The thickness of the electrode diaphragm is 350mm - 250mm = 100mm, resulting in a compaction density of 1.55g / cm³. 3 A battery negative electrode sheet with a length of 100mm and a width of 75mm.

[0051] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0052] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery electrode film forming apparatus, characterized in that, include: The first mold (1), the second mold (2), and the vibration structure (3) are provided. The first mold (1) is provided with a cavity (11) for filling solid powder to be pressed. The second mold (2) is provided with a protrusion (21) which can extend into the cavity (11) and press the solid powder so that the solid powder is integrally formed into a battery electrode. The vibration structure (3) is connected to the first mold (1) and / or the second mold (2) and can vibrate to separate the battery electrode from the first mold (1) and the second mold (2).

2. The battery electrode film forming apparatus according to claim 1, characterized in that, The vibration structure (3) includes an ultrasonic transducer (31) and an ultrasonic generator. One end of the ultrasonic transducer (31) can be connected to one side of the first mold (1) and / or the second mold (2), and the other end of the ultrasonic transducer (31) can be connected to the ultrasonic generator.

3. The battery electrode film forming apparatus according to claim 2, characterized in that, The vibration structure (3) also includes an ultrasonic amplitude transformer (32), which can be connected between the first mold (1) and the ultrasonic transducer (31) to adjust the amplitude and frequency of the ultrasonic waves output by the ultrasonic transducer (31) to a preset range.

4. The battery electrode film forming apparatus according to claim 1, characterized in that, The vibration direction of the first mold (1) and / or the second mold (2) is parallel to the pressing direction of the first mold (1) and the second mold (2).

5. The battery electrode film forming apparatus according to claim 1, characterized in that, The inner surface of the cavity (11) is covered with an anti-adhesion layer; and / or, the outer surface of the protrusion (21) is covered with the anti-adhesion layer.

6. The battery electrode film forming apparatus according to claim 1, characterized in that, The battery electrode film forming device further includes a heating structure (4), which is thermally connected to the first mold (1).

7. The battery electrode film forming apparatus according to claim 6, characterized in that, The heating structure (4) includes a heat spreader plate (41) and a heating unit. The heat spreader plate (41) is attached to the first mold (1), and the heating unit is connected to the heat spreader plate (41) to supply heat to the first mold (1) through the heat spreader plate (41).

8. The battery electrode film forming apparatus according to claim 7, characterized in that, The heating unit includes a power module and a heat-conducting wire (421). The heat-conducting wire (421) is connected to one side of the heat spreader (41), and the two ends of the heat-conducting wire (421) are respectively connected to the positive and negative terminals of the power module.

9. The battery electrode film forming apparatus according to claim 8, characterized in that, The heat-conducting wire (421) is any one of the following: serpentine, loop-shaped, and grid-shaped.

10. The battery electrode film forming apparatus according to any one of claims 1-9, characterized in that, The first mold (1) is a metal part; and / or, the second mold (2) is a metal part.

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