A method of compression molding a flow battery plate frame, a flow battery plate frame

Abstract

The application discloses a kind of liquid flow battery panel frame moulding forming method, liquid flow battery panel frame, the liquid flow battery panel frame moulding forming method includes the following steps: S1, first constant temperature drying is carried out to high molecular powder material as main body, second constant temperature drying is carried out to auxiliary powder material;S2, after first constant temperature drying, high molecular powder material, after second constant temperature drying, auxiliary powder material is mixed, is stirred evenly, and obtains mixed material;S3, mixed material is placed into mould, and moulding forming is carried out, and liquid flow battery panel frame semi-finished product is formed;S4, liquid flow battery panel frame semi-finished product is demoulded, and is naturally air-cooled to normal temperature, and liquid flow battery panel frame is obtained.The liquid flow battery panel frame moulding forming method can ensure that the liquid flow battery panel frame obtained is dimensionally stable, does not produce local stress deformation, can also play toughening effect to high molecular powder material as main body, process is simple, does not need high temperature, and the requirement of moulding forming equipment is low.

Description

Technical Field

[0001] This invention belongs to the field of flow batteries, and specifically relates to a molding method for a flow battery plate frame and the flow battery plate frame. Background Technology

[0002] Currently, the polymer materials in the frame of flow battery panels are usually processed and molded using injection molding, which involves injection molding in the molten state. This process is complex, requires high-performance injection molding equipment, and results in unstable injection quality. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a molding method for a flow battery frame, comprising the following steps:

[0004] S1. Perform a first isothermal drying on the main polymer powder material and a second isothermal drying on the auxiliary powder material.

[0005] S2. Mix the first constant-temperature dried polymer powder material and the second constant-temperature dried auxiliary powder material, stir evenly, and obtain a mixture.

[0006] S3. Place the mixture into the mold and press it to form a semi-finished product of the flow battery frame;

[0007] S4. Demold the semi-finished flow battery frame and allow it to cool naturally to room temperature to obtain the flow battery frame.

[0008] Furthermore, in step S1, during the first constant temperature drying, the constant temperature is 80°C and the drying time is 2 hours.

[0009] Furthermore, in step S1, during the second constant temperature drying, the constant temperature is 80°C and the drying time is 2 hours.

[0010] Furthermore, in step S2, the auxiliary powder material after the second constant temperature drying is 15 to 25 wt% of the polymer powder material after the first constant temperature drying.

[0011] Furthermore, in step S3, during compression molding, the temperature is 100~140℃ and the pressure is 8~12MPa.

[0012] 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.

[0013] Furthermore, the polymer powder material is polypropylene.

[0014] Furthermore, the auxiliary powder material has good compatibility with the polymer powder material and can be blended and molded.

[0015] Furthermore, the auxiliary powder material is a thermoplastic polyolefin elastomer.

[0016] The present invention also provides a flow battery frame, which is manufactured by the aforementioned molding method of a flow battery frame.

[0017] Compared with existing technologies, the compression molding method for flow battery panels provided by this 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 but lower than the melting point of the polymer powder materials, can ensure the dimensional stability of the final flow battery panel frame, prevent local stress deformation, and avoid large dimensional deformation and local stress concentration caused by high-temperature injection molding and melt molding operations. This can prevent deformation phenomena such as unevenness and warping. In addition, it can also toughen the polymer powder materials (such as polypropylene) as the main body, improve their flexibility and load-bearing strength. At the same time, the process 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. Attached Figure Description

[0018] Figure 1 A flowchart of a molding method for a flow battery plate frame according to an embodiment of the present invention is shown. Detailed Implementation

[0019] The specific embodiments of the present invention will be described in detail below. 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 this invention do not indicate any order, quantity, or importance, but are only used to distinguish different components. Similarly, the terms "an," "a," or "the," etc., do not indicate a quantity limitation, but indicate the presence of at least one. Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprising of," etc., will be understood to include the stated elements or components, without excluding other elements or other components. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Above," "below," "left," "right," etc., 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.

[0020] Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. Furthermore, the meanings of technical and scientific terms used in this invention should be interpreted as having the same meaning as the corresponding terms defined in commonly used technical manuals, and should not be interpreted as having an idealized or overly formal meaning, unless expressly so defined in this invention.

[0021] Figure 1 A flowchart of the molding method for a flow battery plate frame according to an embodiment of the present invention is shown. See also: Figure 1 The molding method for the flow battery frame includes the following steps:

[0022] S1. Perform a first isothermal drying on the main polymer powder material and a second isothermal drying on the auxiliary powder material.

[0023] Specifically, the polymer powder material is polypropylene (PP).

[0024] Specifically, during the first constant temperature drying, the temperature is 80℃ and the drying time is 2 hours.

[0025] Specifically, the auxiliary powder material has good compatibility with the polymer powder material and can be blended and molded.

[0026] Furthermore, the auxiliary powder material is thermoplastic polyolefin elastomer (POE).

[0027] Specifically, during the second constant-temperature drying process, the constant temperature is 80℃ and the drying time is 2 hours.

[0028] S2. Mix the first constant-temperature dried polymer powder material and the second constant-temperature dried auxiliary powder material, stir evenly, and obtain a mixture.

[0029] Specifically, 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.

[0030] Preferably, based on actual verification by the inventors, the auxiliary powder material after the second constant-temperature drying is 20 wt% 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.

[0031] S3. Place the mixture into the mold and mold it to form a semi-finished product of the flow battery frame.

[0032] Specifically, during compression molding, the temperature is 100~140℃ and the pressure is 8~12MPa.

[0033] Preferably, considering that the higher the temperature during the compression molding process, the lower the required pressure, and vice versa, the lower the temperature, the higher the required pressure, and that the natural cooling time of the flow battery frame is longer when the temperature is higher and secondary deformation is more likely to occur, and the higher the pressure, the higher the requirements for the compression molding equipment, the inventors have verified that the temperature is 120℃ and the pressure is 10MPa during compression molding, which provides high compatibility with the compression molding equipment.

[0034] 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.

[0035] The main polymer powder material (such as polypropylene) has a melting point of 160~175℃, while the auxiliary powder material (such as thermoplastic polyolefin elastomer) has a melting point of 80~130℃. There is a significant temperature difference between the melting points of 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 but lower than the melting point of the polymer powder material. This results in the auxiliary powder material being in a molten state and the polymer powder material being in a solid state. The molten auxiliary powder material (which has a certain degree of fluidity) fully bonds with the solid polymer powder material under pressure to form an integral structure, thus achieving compression molding.

[0036] S4. Demold the semi-finished flow battery frame and allow it to cool naturally to room temperature to obtain the flow battery frame.

[0037] In summary, this invention provides a compression molding method for a flow battery frame. The method involves isolating and drying the main polymer powder material and auxiliary powder materials at a constant temperature, then mixing and stirring them to obtain a mixture. This mixture is then placed into a mold for compression molding to form a semi-finished flow battery frame. Finally, the semi-finished flow battery frame is demolded and allowed to cool naturally to room temperature to obtain the final flow battery frame. This compression molding method, by adding auxiliary powder materials (such as thermoplastic polyolefin elastomers) and controlling the mold temperature to be higher than the melting point of the auxiliary powder materials but lower than the melting point of the polymer powder materials, ensures that the molten auxiliary powder materials (possessing a certain degree of fluidity) fully bond with the solid polymer powder materials under pressure, forming an integral structure. This ensures the dimensional stability of the final flow battery frame, preventing localized stress deformation and avoiding large dimensional deformations and localized stress concentrations caused by high-temperature injection molding and melt molding operations. This also prevents unevenness and irregularities. Deformation phenomena such as warping; in addition, the applicant's actual verification found that adding low-melting-point auxiliary powder materials (such as thermoplastic polyolefin elastomers with a melting point of 80~130℃) can not only enable the auxiliary powder materials in the molten state to fully bond with the polymer powder materials in the solid state under pressure to form an integral structure, but also have a toughening effect on the main polymer powder materials (such as polypropylene), improving their flexibility and load-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.

[0038] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of protection 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, Includes the following steps: S1. Perform a first isothermal drying on the main polymer powder material and a second isothermal drying on the auxiliary powder material. S2. Mix the first constant-temperature dried polymer powder material and the second constant-temperature dried auxiliary powder material, stir evenly, and obtain a mixture. S3. Place the mixture into a mold and perform molding to form a flow battery plate frame semi-finished product; S4. Demold the semi-finished flow battery frame and allow it to cool naturally to room temperature to obtain the flow battery frame. in, 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 step S3, during the compression molding process, the temperature is 100~140℃ and the pressure is 8~12MPa; In step S3, during the compression molding process, 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. The auxiliary powder material has good compatibility with the polymer powder material and can be blended during compression molding. The polymer powder material is polypropylene, and the auxiliary powder material is thermoplastic polyolefin elastomer.

2. The molding method for 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 for 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. A flow battery frame, characterized in that, It is prepared by a molding method for a flow battery plate frame according to any one of claims 1 to 3.

Images