Battery diaphragm hot-pressing device

Abstract

The battery diaphragm hot-pressing device comprises an upper mold and a lower mold, breathing openings arranged in an array mode are formed in the surface of the upper end of the lower mold, breathing columns are arranged in the breathing openings, the breathing columns and the breathing openings are connected in a sealed and sliding mode, breathing holes are formed in the surfaces of the upper ends of the breathing columns, and the breathing holes are communicated with the breathing openings. The plurality of breathing holes are externally connected with air pumping equipment; the breathing column is provided with a hot pressing position and a breathing position, and a control device is further arranged in the lower die. According to the utility model, the arrangement density of the breathing holes is reduced, and the pneumatic adhesion removal device is particularly suitable for pneumatic adhesion removal of large-size battery diaphragms.

Description

Technical Field

[0001] The utility model relates to the technical field of diaphragm hot pressing production, in particular to a battery diaphragm hot pressing device. Background Art

[0002] During the hot pressing process of the battery diaphragm, it is placed between the upper and lower molds, and the battery diaphragm and the positive and negative electrode materials are hot pressed into shape at a certain temperature. However, in the case of high-temperature hot pressing, the formed material adheres to the surface of the hot pressing mold, affecting the subsequent blanking process and easily causing damage to the material.

[0003] Some designs use a breathing anti-adhesion structure, which can gently separate the battery diaphragm from the mold, simplify the blanking process, and reduce the damage to the material surface at the same time. This type of breathing anti-adhesion structure requires an array of breathing holes to be arranged on the mold surface, and the automatic separation of the battery diaphragm is achieved by introducing air flow.

[0004] However, for large-sized hot pressing devices, the number of breathing holes arranged on their surfaces needs to increase accordingly, increasing the manufacturing and maintenance costs. At the same time, the spacing between each breathing hole cannot exceed a threshold to prevent the air flow from not effectively acting on the battery diaphragm at positions far from the breathing holes. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the disadvantages existing in the prior art, and a battery diaphragm hot pressing device is proposed, which reduces the arrangement density of breathing holes and is especially suitable for pneumatic anti-adhesion of large-sized battery diaphragms.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A battery diaphragm hot pressing device includes an upper mold and a lower mold. The upper surface of the lower mold is provided with an array of breathing openings. A breathing column is arranged inside the breathing opening, and the breathing column is in sealed sliding connection with the breathing opening. The upper surface of the breathing column is provided with breathing holes, and a plurality of the breathing holes are externally connected to a gas pumping device. The breathing column has a hot pressing position and a breathing position, and a control device is further arranged inside the lower mold, and the breathing column is controlled to sink to the breathing position through the control device.

[0008] Preferably, the control device includes a control platform with an internal conduction cavity. A plurality of the breathing columns are fixedly connected to the upper end of the control platform, and further includes a telescopic element for driving the linear movement of the control platform.

[0009] Preferably, a pneumatic joint communicated with the conduction cavity is fixed on the side wall of the control platform.

[0010] Preferably, a receiving chamber is arranged inside the lower mold, and the control platform and the telescopic element are located inside the receiving chamber.

[0011] Preferably, a first guiding rod is fixed to the upper end of the control platform, and the first guiding rod is slidably connected to the inner wall of the accommodating chamber.

[0012] Preferably, the horizontal cross-section of the breathing column is circular.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] When the breathing column is in the hot pressing position, each breathing column performs a small-range pneumatic anti-adhesion function; after the small-range anti-adhesion is completed, the breathing column contracts to the breathing position, and the breathing column as a whole performs a large-range pneumatic anti-adhesion, and at this time, the control battery diaphragm is disengaged from the breathing opening as a whole; the sequential pneumatic control can reduce the layout density of the breathing holes, and is particularly suitable for pneumatic anti-adhesion of large-size battery diaphragms. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a three-dimensional structural schematic diagram of the present utility model.

[0016] Figure 2 is a side view structural schematic diagram of the present utility model.

[0017] Figure 3 For the present utility model Figure 2 is a sectional structural schematic diagram taken along the A-A direction.

[0018] Figure 4 is a schematic diagram of the breathing column of the present utility model.

[0019] In the figure: 100, upper mold; 110, upper mold body; 120, second guiding rod; 200, lower mold; 210, accommodating chamber; 220, breathing opening; 300, breathing column; 310, breathing hole; 400, control device; 410, control platform; 411, pneumatic joint; 412, first guiding rod; 420, telescopic element. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] In order to make the above-mentioned objects, features and advantages of the present utility model more obvious and understandable, the following detailed description of the specific embodiments of the present utility model will be made with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model 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 connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0021] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are only for illustrative purposes and do not represent the only implementation.

[0022] Through the hot pressing device, the positive and negative electrode materials can be hot pressed onto the surface of the positive and negative electrode materials to complete the processing and preparation of the battery pack.

[0023] During the hot pressing process of the battery separator, it is placed between the upper and lower molds, and the battery separator and the positive and negative electrode materials are hot pressed into shape at a certain temperature; however, in the case of high-temperature hot pressing, the formed material adheres to the surface of the hot pressing mold, affecting the subsequent blanking process and easily causing damage to the materials.

[0024] Some designs use a breathing anti-adhesion structure, which can enable the battery separator to gently separate from the mold, simplify the blanking process, and reduce the damage to the material surface at the same time; this type of breathing anti-adhesion structure requires the array arrangement of breathing holes on the mold surface to achieve the automatic separation of the battery separator by introducing air flow; however, for large-sized hot pressing devices, the number of breathing holes arranged on its surface needs to increase accordingly, increasing the manufacturing and maintenance costs, and at the same time, the distance between each breathing hole cannot exceed the threshold to prevent the air flow from not effectively acting on the battery separator at positions far from the breathing holes.

[0025] To solve the above problems; referring to the attached Figure 1 - attached Figure 4 , a battery separator hot pressing device, including an upper mold 100 and a lower mold 200, the upper surface of the lower mold 200 is provided with an array of breathing openings 220, the size of the breathing openings 220 is larger than that of the traditional design, and the size between two adjacent breathing openings 220 and the area of the array arrangement of the breathing openings 220 are determined according to the separator to be hot pressed.

[0026] Inside the breathing opening 220, a breathing column 300 is provided. The breathing column 300 is hermetically and slidably connected to the breathing opening 220. The upper surface of the breathing column 300 is provided with breathing holes 310, and a plurality of breathing holes 310 are externally connected to a gas pumping device; by pumping gas into the breathing holes 310 through the gas pumping device, the pumped gas can directly act on the corresponding battery diaphragm surface, causing the battery diaphragm in this part to be separated from the hot pressing die; here, the breathing column 300 has a hot pressing position (flush with the upper surface of the lower die 200) and a breathing position (below the hot pressing position). A control device 400 is also provided inside the lower die 200. By controlling the control device 400, the breathing column 300 is lowered to the breathing position. At this time, after the battery diaphragm corresponding to the breathing column 300 is separated from the surface of the lower die 200, the breathing column 300 is controlled to descend and contract to the breathing position. At this time, gas is continuously pumped into the breathing holes 310 as well. A new breathing structure is formed between a plurality of relatively large breathing openings 220, and the continuously pumped gas can act on the battery diaphragm, causing the battery diaphragm to be separated from the surface of the lower die 200.

[0027] Through the above structural design, when the breathing column 300 is in the hot pressing position, each breathing column 300 plays a role in pneumatic anti-adhesion in a small range; after the small-range anti-adhesion is completed, the breathing column 300 contracts to the breathing position, and the whole breathing column 300 performs pneumatic anti-adhesion in a large range, controlling the overall separation of the battery diaphragm from the breathing opening 220; sequential pneumatic control can reduce the layout density of the breathing holes 310, which is especially suitable for pneumatic anti-adhesion of large-sized battery diaphragms.

[0028] Here, the horizontal cross-section of the breathing column 300 is preferably circular. The circular breathing column 300 is easy to be turned and processed, has good matching accuracy with the breathing opening 220, and has good sealing effect; when the breathing column 300 is in the hot pressing position, the top of the breathing column 300 is flush with the upper end of the lower die 200, which can play a good supporting role for the battery diaphragm and has no influence on hot pressing.

[0029] Specifically, the control device 400 includes a control platform 410 with an internal conduction cavity. A plurality of breathing columns 300 are fixedly connected to the upper end of the control platform 410, and the bottom of the breathing column 300 is communicated with the conduction cavity. It also includes a telescopic element 420 for driving the linear movement of the control platform 410. Here, the telescopic element 420 can be selected as an electric or hydraulic telescopic structure to adjust the control platform 410 to drive a plurality of breathing columns 300 to move up and down, so that the breathing column 300 is in the hot pressing position or the breathing position; through the above structural design, the control process is simplified, and a plurality of breathing columns 300 can be synchronously and cooperatively controlled.

[0030] A pneumatic joint 411 communicating with the conduction cavity is fixed on the side wall of the control platform 410. The pneumatic joint 411 is communicated with a gas pumping device to control the air pressure in the conduction cavity, enabling the gas to flow out from the breathing hole 310 and realizing pneumatic anti-adhesion.

[0031] A receiving chamber 210 is formed inside the lower mold 200. The control platform 410 and the telescopic element 420 are located in the receiving chamber 210, realizing a hidden design of the overall structure of the control device 400. Moreover, a first guiding rod 412 is fixed to the upper end of the control platform 410. The first guiding rod 412 is slidably connected to the inner wall of the receiving chamber 210. Through the first guiding rod 412, the installation position and the sliding position of the control platform 410 can be guided, ensuring the accuracy and stability of the linear movement of the breathing column 300 and realizing better pneumatic anti-adhesion.

[0032] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A battery diaphragm hot pressing device, comprising an upper mold (100) and a lower mold (200), wherein the upper end surface of the lower mold (200) is provided with breathing openings (220) arranged in an array, characterized in that: A breathing column (300) is arranged inside the breathing opening (220), the breathing column (300) is sealed and slidably connected to the breathing opening (220), a breathing hole (310) is opened on the upper end surface of the breathing column (300), and a plurality of the breathing holes (310) are externally connected to an air pump device; the breathing column (300) has a hot pressing position and a breathing position, and a control device (400) is also arranged inside the lower mold (200), and the breathing column (300) is controlled by the control device (400) to sink to the breathing position.

2. The battery diaphragm hot pressing device according to claim 1, characterized in that: The control device (400) comprises a control platform (410) with a built-in conduction cavity, a plurality of the breathing columns (300) are fixedly connected to the upper end of the control platform (410), and also comprises a telescopic element (420) for driving the control platform (410) to move linearly.

3. The battery separator hot pressing device according to claim 2, characterized in that: A pneumatic joint (411) communicating with the conduction cavity is fixed on the side wall of the control platform (410).

4. The battery diaphragm hot pressing device according to claim 2, characterized in that: The lower mold (200) has a receiving chamber (210) formed inside, and the control platform (410) and the telescopic element (420) are located inside the receiving chamber (210).

5. The battery separator hot pressing device according to claim 4, characterized in that: A first guide rod (412) is fixed to the upper end of the control platform (410), and the first guide rod (412) is slidably connected to the inner wall of the accommodation chamber (210).

6. The battery separator hot pressing device according to claim 1, characterized in that: The breathing column (300) has a circular horizontal cross-section.

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