Compression molding method of liquid flow cell panel frame and liquid flow cell panel frame

Abstract

The invention discloses a compression molding method of a liquid flow battery plate frame and the liquid flow battery plate frame. The compression molding method of the liquid flow battery plate frame comprises the following steps: S1, carrying out first constant-temperature drying on a polymer powder material serving as a main body, and carrying out second constant-temperature drying on an auxiliary powder material; s2, mixing the high-molecular powder material after the first constant-temperature drying and the auxiliary powder material after the second constant-temperature drying, and uniformly stirring to obtain a mixture; s3, putting the mixture into a mold, and carrying out compression molding to form a semi-finished product of the liquid flow battery plate frame; and S4, demolding the semi-finished product of the liquid flow battery plate frame, and naturally air-cooling to normal temperature to obtain the liquid flow battery plate frame. The compression molding method of the liquid flow cell panel frame can ensure that the obtained liquid flow cell panel frame is stable in size and free of local stress deformation, can also achieve a toughening effect on a polymer powder material serving as a main body, and is simple in process, free of high temperature and low in requirement on compression molding equipment.

Description

Technical Field

[0001] The present invention belongs to the field of liquid flow batteries, and in particular relates to a molding method for a liquid flow battery plate frame and a liquid flow battery plate frame. Background Art

[0002] At present, the processing and molding of polymer materials in flow battery panel frames usually adopts the injection molding process, that is, injection molding is performed in a molten state. There are problems such as complex injection molding process, high requirements for injection molding equipment, and unstable injection molding quality. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides a method for molding a flow battery plate frame, which comprises the following steps: S1. Performing a first constant temperature drying on the main polymer powder material and a second constant temperature drying on the auxiliary powder material; S2, mixing the polymer powder material after the first constant temperature drying and the auxiliary powder material after the second constant temperature drying, stirring them evenly to obtain a mixture; S3, placing the mixed material into a mold and performing compression molding to form a semi-finished flow battery plate frame; S4. Demolding the semi-finished flow battery plate frame and naturally cooling it to room temperature to obtain the flow battery plate frame.

[0004] Furthermore, in step S1, during the first constant temperature drying, the constant temperature is 80° C. and the drying time is 2 hours.

[0005] Furthermore, in step S1, during the second constant temperature drying, the constant temperature is 80° C. and the drying time is 2 hours.

[0006] Furthermore, in step S2, the auxiliary powder material after the second constant temperature drying is 15-25 wt% of the polymer powder material after the first constant temperature drying, in parts by weight (ie, wt%).

[0007] Furthermore, in step S3, during compression molding, the temperature is 100-140° C. and the pressure is 8-12 MPa.

[0008] Furthermore, in step S3, during compression molding, the temperature of the mold is controlled to be higher than the melting point of the auxiliary powder material in the mixture and lower than the melting point of the polymer powder material in the mixture.

[0009] Furthermore, the polymer powder material is polypropylene.

[0010] Furthermore, the auxiliary powder material has good compatibility with the polymer powder material and can be blended and formed.

[0011] Furthermore, the auxiliary powder material is thermoplastic polyolefin elastomer.

[0012] The present invention also provides a liquid flow battery plate frame, which is manufactured by the aforementioned molding method for a liquid flow battery plate frame.

[0013] Compared with the prior art, the compression molding method for the liquid flow battery plate frame provided by the present invention, by adding auxiliary powder materials (such as thermoplastic polyolefin elastomers) and controlling the temperature of the mold to be higher than the melting point of the auxiliary powder materials and lower than the melting point of the polymer powder materials, can ensure that the final liquid flow battery plate frame is dimensionally stable, does not produce local stress deformation, avoids large dimensional deformation and local stress concentration caused by high-temperature operations of injection molding and melt molding, and thus prevents deformation phenomena such as convexity and concavity, warping, etc.; in addition, it can also have a toughening effect on the polymer powder material (such as polypropylene) as the main body, thereby improving its flexibility and bearing strength; at the same time, the process flow is simple, does not require high temperature (the temperature during compression molding does not exceed 140°C), and has low requirements for compression molding equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A flow chart of a molding method for a flow battery plate frame according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0015] The following is a detailed description of specific embodiments of the present invention. It should be understood that the embodiments of the present invention are not limited to the embodiments shown in the accompanying drawings, and the scope of protection of the present invention is not limited by the specific embodiments. The terms "first," "second," and similar terms used in the present invention do not indicate any order, quantity, or importance, but are only used to distinguish different components. Similarly, terms such as "one," "an," or "the" do not indicate a quantitative limitation, but rather indicate the presence of at least one. Unless otherwise expressly indicated, throughout the specification and claims, the term "comprise" or variations such as "include" or "comprising" will be understood to include the elements or components stated, without excluding other elements or components. Terms such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0016] Unless otherwise defined, the meanings of all technical terms and scientific terms used in the present invention are the same as those commonly understood by ordinary technicians in the field. In addition, the meanings of the technical terms and scientific terms used in the present invention should be interpreted as having the same meanings as the corresponding terms defined in commonly used technical manuals, and should not be interpreted as having idealized or excessive formal meanings, unless explicitly defined in this way in the present invention.

[0017] Figure 1A flow chart showing a method for molding a flow battery plate frame according to an embodiment of the present invention is shown. Figure 1 The molding method of the flow battery plate frame comprises the following steps: S1. Performing a first constant temperature drying on the main polymer powder material and a second constant temperature drying on the auxiliary powder material.

[0018] Specifically, the polymer powder material is polypropylene (abbreviated as PP).

[0019] Specifically, during the first constant temperature drying, the constant temperature is 80° C. and the drying time is 2 hours.

[0020] Specifically, the auxiliary powder material and the polymer powder material have good compatibility and can be blended and formed.

[0021] Furthermore, the auxiliary powder material is thermoplastic polyolefin elastomer (POE).

[0022] Specifically, during the second constant temperature drying, the constant temperature is 80° C. and the drying time is 2 hours.

[0023] S2. Mix the polymer powder material after the first constant temperature drying and the auxiliary powder material after the second constant temperature drying, stir them evenly, and obtain a mixture.

[0024] Specifically, in parts by weight (wt%), the auxiliary powder material after the second constant temperature drying is 15-25 wt% of the polymer powder material after the first constant temperature drying.

[0025] Preferably, the inventors have verified that, calculated by weight (wt%), the auxiliary powder material after the second constant temperature drying is 20wt% of the polymer powder material after the first constant temperature drying, and the resulting flow battery plate frame is best matched with the existing sealing method.

[0026] S3. Place the mixed material into a mold and perform compression molding to form a semi-finished product of a flow battery plate frame.

[0027] Specifically, during compression molding, the temperature is 100-140° C. and the pressure is 8-12 MPa.

[0028] Preferably, it is considered that the higher the temperature during the compression molding process, the smaller the required pressure, and vice versa, the lower the temperature, the higher the required pressure. When the temperature is higher, the natural cooling time of the liquid flow battery plate frame is longer and secondary deformation is more likely to occur. The higher the pressure, the higher the requirements for the compression molding equipment. The inventors have actually verified that during compression molding, the temperature is 120°C and the pressure is 10MPa, and the compatibility with the compression molding equipment is higher at this time.

[0029] Specifically, during compression molding, the temperature of the mold is controlled to be higher than the melting point of the auxiliary powder material in the mixture and lower than the melting point of the polymer powder material in the mixture.

[0030] Among them, the melting point of the main polymer powder material (such as polypropylene) is 160~175℃, and the melting point of the auxiliary powder material (such as thermoplastic polyolefin elastomer) is 80~130℃. There is a significant melting point temperature difference between the two powder materials. During compression molding, the temperature of the mold is controlled to be higher than the melting point of the auxiliary powder material and lower than the melting point of the polymer powder material, so that the auxiliary powder material is in a molten state and the polymer powder material is in a solid state. Under the action of pressure, the molten auxiliary powder material (with a certain fluidity) is fully bonded to the solid polymer powder material to form an overall structure, thereby realizing compression molding.

[0031] S4. Demolding the semi-finished flow battery plate frame and naturally cooling it to room temperature to obtain the flow battery plate frame.

[0032] In summary, the present invention provides a method for compression molding of a liquid flow battery plate frame, wherein the polymer powder material and auxiliary powder material as the main body are dried at a constant temperature, then mixed and stirred to obtain a mixture, and then the mixture is placed in a mold and compression molded to form a semi-finished liquid flow battery plate frame. Finally, the semi-finished liquid flow battery plate frame is demolded and naturally cooled to room temperature to obtain a liquid flow battery plate frame. The compression molding method of the liquid flow battery plate frame adds an auxiliary powder material (such as a thermoplastic polyolefin elastomer) and controls the temperature of the mold to be higher than the melting point of the auxiliary powder material and lower than the melting point of the polymer powder material, so that the molten auxiliary powder material (with a certain fluidity) is fully bonded to the solid polymer powder material under pressure to form an integral structure, which can ensure that the final liquid flow battery plate frame is dimensional stable and does not produce local stress deformation, avoids large dimensional deformation and local stress concentration caused by high-temperature operations of injection molding and melt molding, and thus prevents bumps and concavities. , warping and other deformation phenomena; in addition, the applicant has actually verified that adding auxiliary powder materials with low melting points (such as thermoplastic polyolefin elastomers with a melting point of 80~130℃) can not only make the auxiliary powder materials in the molten state fully bond with the polymer powder materials in the solid state under pressure to form an overall structure, but also can have a toughening effect on the polymer powder material (such as polypropylene) as the main body, thereby improving its flexibility and bearing strength; at the same time, the process is simple, does not require high temperature (the temperature during compression molding does not exceed 140℃), and has low requirements for compression molding equipment.

[0033] The foregoing descriptions of specific exemplary embodiments of the present invention are for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many modifications and variations are possible in light of the foregoing teachings. The exemplary embodiments have been selected and described for the purpose of explaining the specific principles of the invention and their practical application, thereby enabling those skilled in the art to realize and utilize a variety of exemplary embodiments of the invention and various options and variations. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for molding a flow battery plate frame, characterized in that: The following steps are involved: S1. Performing a first constant temperature drying on the main polymer powder material and a second constant temperature drying on the auxiliary powder material; S2, mixing the polymer powder material after the first constant temperature drying and the auxiliary powder material after the second constant temperature drying, stirring them evenly to obtain a mixture; S3, placing the mixed material into a mold and performing compression molding to form a semi-finished liquid flow battery plate frame; S4. Demolding the semi-finished flow battery plate frame and naturally cooling it to room temperature to obtain the flow battery plate frame.

2. The molding method of a flow battery plate frame according to claim 1, characterized in that: In step S1, during the first constant temperature drying, the constant temperature is 80° C. and the drying time is 2 hours.

3. The molding method of a flow battery plate frame according to claim 1, characterized in that: In step S1, during the second constant temperature drying, the constant temperature is 80° C. and the drying time is 2 hours.

4. The molding method of a flow battery plate frame according to claim 1, characterized in that: In step S2, the auxiliary powder material after the second constant temperature drying accounts for 15-25 wt% of the polymer powder material after the first constant temperature drying, in parts by weight (ie, wt%).

5. The molding method of a flow battery plate frame according to claim 1, characterized in that: In step S3, during the compression molding, the temperature is 100-140° C. and the pressure is 8-12 MPa.

6. The molding method of a flow battery plate frame according to claim 1, characterized in that: In step S3, during the compression molding, the temperature of the mold is controlled to be higher than the melting point of the auxiliary powder material in the mixture and lower than the melting point of the polymer powder material in the mixture.

7. The molding method of the flow battery plate frame according to claim 1, characterized in that: The polymer powder material is polypropylene.

8. The molding method of a flow battery plate frame according to claim 1, characterized in that: The auxiliary powder material and the polymer powder material have good compatibility and can be blended and formed.

9. The molding method of a flow battery plate frame according to claim 8, characterized in that: The auxiliary powder material is thermoplastic polyolefin elastomer.

10. A flow battery plate frame, characterized in that: The plate frame is manufactured by the compression molding method of a flow battery according to any one of claims 1 to 9.

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