CN212380446U

CN212380446U - Flow battery plate frame sealing structure

Info

Publication number: CN212380446U
Application number: CN202023061129.3U
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhonghai Energy Storage Technology Beijing Co Ltd
Current assignee: Zhonghai Energy Storage Technology Beijing Co Ltd
Priority date: 2020-12-17
Filing date: 2020-12-17
Publication date: 2021-01-19
Anticipated expiration: 2030-12-17

Abstract

The utility model provides a flow battery plate frame sealing structure, which comprises a plate frame and a sealing ring, wherein the plate frame comprises an upper plate frame and a lower plate frame, and an electrode and a diaphragm are arranged between the upper plate frame and the lower plate frame; the sealing ring is composed of a core layer and an outer layer, the core layer is made of silicon rubber, and the outer layer is made of fluororubber; the cross-sectional shape of sealing washer is semicircle lower joint rectangle shape, the planar one side of sealing washer with the diaphragm is relative. The utility model provides a liquid flow battery plate frame sealing structure, which adopts a double-layer structure of fluororubber-silicon rubber inside and outside, reduces the hardness of a sealing ring which independently adopts fluororubber, and reduces the probability of diaphragm damage; and the outer layer of the fluororubber isolates the acid electrolyte from the core layer of the silicon rubber, so that the service life of the sealing ring is ensured.

Description

Flow battery plate frame sealing structure

Technical Field

The utility model belongs to the technical field of the energy storage, concretely relates to a seal structure for redox flow battery.

Background

A flow battery is a battery in which a liquid electrolyte is used as an electrode active material. The electrolyte solution comprises redox couple and supporting electrolyte, wherein the redox couple can be Ti/Fe, Cr-Fe. Zn/Fe, sodium polysulfide/bromine (PSB), Mn³⁺/Mn²⁺And all Vanadium (VRFB), and the like; the supporting electrolyte is sulfuric acid or hydrochloric acid. Therefore, the electrolyte of the flow battery has a strong acidic characteristic. The structural materials of the flow battery also need to be resistant to strong acid and capable of resisting certain high temperature (up to 80 ℃).

Most of the structural materials of the flow battery are plastics, such as polyvinyl chloride (PVC), chlorinated polyvinyl chloride (CPVC) and the like, which form a frame, namely a plate frame; and a sealing piece is arranged on the plate frame and is a sealing strip or a sealing ring. In order to resist acid, the sealing element is made of fluororubber. The fluororubber is a copolymer of vinyl fluoride and hexafluoropropylene, and is a perfluorinated polymer, so the fluororubber sealing element has extremely strong chemical resistance and low-temperature resistance, and the fluororubber sealing element also has excellent properties such as high-temperature resistance, ozone resistance, weather resistance, oxidation resistance, oil resistance and the like. The extremely strong chemical resistance of fluororubbers makes them particularly suitable for sealing flow batteries. But the fluororubber is hard and has poor elasticity; the sealing element in the flow battery is in direct contact with the diaphragm, and the diaphragm becomes soft and deformed under the action of temperature and fluid during the operation of the battery, and the contact part of the diaphragm and the sealing element is easy to damage.

Disclosure of Invention

The weak point that exists to prior art, the utility model aims at providing a novel flow cell panel frame seal structure, solve current fluorine rubber seal circle too hard, damage the problem of diaphragm easily.

Realize the utility model discloses the technical scheme of above-mentioned purpose does:

a flow battery plate frame sealing structure comprises a plate frame and a sealing ring, wherein the plate frame comprises an upper plate frame and a lower plate frame, and an electrode and a diaphragm are arranged between the upper plate frame and the lower plate frame; the sealing ring is characterized in that the sealing ring is formed by a core layer and an outer layer, the core layer is made of silicon rubber, and the outer layer is made of fluororubber; the cross-sectional shape of sealing washer is semicircle lower joint rectangle shape, the planar one side of sealing washer with the diaphragm is relative.

The silicon rubber has no perfluorinated chemical structure and has chemical resistance lower than that of fluororubber; however, the flexibility and resilience of the silicon rubber are superior to those of the fluororubber, and the silicon rubber serving as an inner core of the sealing element can provide better elasticity in the operation of the battery and ensure that the diaphragm is not damaged by the sealing element.

The sealing ring is rectangular, and a rectangular groove matched with the sealing ring in shape is formed in the plate frame.

Preferably, the cross section of the core layer is semicircular or semicircular and rectangular, and the thickness of the outer layer is 0.5-2 mm.

The utility model discloses an optimal technical scheme does, the cross-sectional width of sealing washer is 3~5mm, and thickness is 3~5mm, and the height of the rectangle that the semicircle was connected down is 0.5~1.5 mm.

The width of the rectangular groove on the plate frame is 3-5 mm, and the depth of the rectangular groove is 0.2-1 mm smaller than the thickness of the sealing ring.

The beneficial effects of the utility model reside in that:

the utility model provides a liquid flow battery plate frame sealing structure, which adopts a double-layer structure of fluororubber-silicon rubber inside and outside, reduces the hardness of a sealing ring which independently adopts fluororubber, and reduces the probability of diaphragm damage; and the outer layer of the fluororubber isolates the acid electrolyte from the core layer of the silicon rubber, so that the service life of the sealing ring is ensured.

In the sealing structure, the section shape of the sealing ring is semicircular, the plane surface faces the diaphragm, the section shape of the rectangular groove for placing the sealing element is rectangular, the deformation of the sealing ring can be accommodated when the battery is fastened, and the sealing effect is good.

Drawings

Fig. 1 is the utility model discloses flow cell plate frame seal structure's sealing washer cross section sketch map.

FIG. 2 is a top view of the seal ring;

FIG. 3 is a schematic view of the combination of the seal ring and the plate frame;

in the figure, the position of the upper end of the main shaft,

1 is a sealing ring, 101 is a core layer, 102 is an outer layer, 103 is one surface of a sealing ring plane, and 2 is a plate frame.

Detailed Description

The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the present invention, it should be understood that the terms "center", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings; the terminology used is for the purpose of describing the invention only and is not intended to be limiting, nor is it intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation; and therefore should not be construed as limiting the scope of the invention.

In the examples, the technical means used are all the technical means existing in the field, unless otherwise specified.

Example 1

A flow battery plate frame sealing structure comprises a plate frame and a sealing ring, wherein the plate frame comprises an upper plate frame and a lower plate frame. The middle part of the plate frame is provided with a rectangular cavity for placing the bipolar plate. Electrodes and diaphragms are arranged between the upper plate frame and the lower plate frame, and one electrode is arranged on each of two sides of one diaphragm. The upper plate frame and the lower plate frame are respectively provided with a sealing ring, and the two sealing rings are opposite to each other and press the diaphragm. Referring to fig. 1, the seal ring 1 is a seal ring composed of a core layer 101 and an outer layer 102, the core layer is made of silicon rubber, and the outer layer is made of fluororubber; the cross-sectional shape of the sealing ring is a semicircle lower rectangular shape, and one surface 103 of the sealing ring plane is opposite to the diaphragm (fig. 3).

The sealing ring is rectangular (figure 2), and a rectangular groove matched with the sealing ring in shape is formed in the plate frame. The sealing washer four corners fillet R4.5 of this embodiment, the same chamfer of rectangular channel on the sheet frame.

In this embodiment, the cross-sectional shape of the core layer 101 is a semicircle, and the thickness of the outer layer is 1.0 mm. The width of the section of the sealing ring is 4.5mm, the thickness is 3.2mm, and the height of the rectangle connected with the semicircle is 1.0 mm. The length and width of the sealing ring are 535 multiplied by 325mm (based on the center of the sealing ring), and the compression ratio of the sealing ring is 30 percent.

Referring to fig. 3, the width of the rectangular groove on the plate frame 2 is 4.5mm, the depth is 3mm, and the cross section of the rectangular groove is rectangular and can accommodate the deformation of the sealing ring.

The sealing ring is a closed sealing ring which is formed by wrapping inner cores with fluororubber skins to form double-layer rubber long lines, cutting the double-layer rubber long lines according to the required length of the sealing ring and then adhering the double-layer rubber long lines with viscose.

Example 2

The embodiment provides a flow cell plate frame seal structure, including plate frame and sealing washer, the plate frame includes upper plate frame and lower plate frame. The middle part of the plate frame is provided with a rectangular cavity for placing the bipolar plate. An electrode and a diaphragm are arranged between the upper plate frame and the lower plate frame; referring to fig. 1, the seal ring 1 is a seal ring composed of a core layer 101 and an outer layer 102, the core layer is made of silicon rubber, and the outer layer is made of fluororubber; the cross-sectional shape of the sealing ring is a semicircle lower connecting rectangle, and one surface 103 of the sealing ring plane is opposite to the diaphragm.

The sealing ring is rectangular, and a rectangular groove matched with the sealing ring in shape is formed in the plate frame. The sealing washer four corners fillet R4.5 of this embodiment, the same chamfer of rectangular channel on the sheet frame.

In this embodiment, the cross-sectional shape of the core layer 101 is a semicircle, and the thickness of the outer layer is 1.0 mm. The width of the section of the sealing ring is 4.5mm, the thickness is 3.2mm, and the height of the rectangle connected with the semicircle is 1.0 mm. The length and width of the sealing ring are 605 multiplied by 400mm (counted by the center of the sealing ring), and the compression ratio of the sealing ring is 30 percent.

The width of the rectangular groove on the plate frame 2 is 4.5mm, the depth is 2.8mm, and the cross section of the rectangular groove is rectangular and can accommodate the deformation of the sealing ring.

Although the present invention has been described above by way of examples, it should be understood by those skilled in the art that modifications and variations of the present invention are within the scope of the present invention without departing from the spirit and nature of the present invention.

Claims

1. A flow battery plate frame sealing structure comprises a plate frame and a sealing ring, wherein the plate frame comprises an upper plate frame and a lower plate frame, and an electrode and a diaphragm are arranged between the upper plate frame and the lower plate frame; the sealing ring is characterized in that the sealing ring is formed by a core layer and an outer layer, the core layer is made of silicon rubber, and the outer layer is made of fluororubber; the cross-sectional shape of sealing washer is semicircle lower joint rectangle shape, the planar one side of sealing washer with the diaphragm is relative.

2. The flow cell plate frame seal structure of claim 1, wherein the seal ring is rectangular in shape, and a rectangular groove matched with the shape of the seal ring is formed in the plate frame.

3. The liquid flow battery plate frame sealing structure of claim 1, wherein the cross section of the core layer is semicircular or semicircular and rectangular, and the thickness of the outer layer is 0.5-2 mm.

4. A liquid flow battery plate frame sealing structure according to any one of claims 1 to 3, wherein the cross section width of the sealing ring is 3 to 5mm, the thickness of the sealing ring is 3 to 5mm, and the height of the rectangle connected with the semi-circle in a downward mode is 0.5 to 1.5 mm.

5. The liquid flow battery plate frame sealing structure according to claim 2, wherein the cross section of the rectangular groove in the plate frame is rectangular, the width of the rectangular groove is 3-5 mm, and the depth of the rectangular groove is 0.2-1 mm smaller than the thickness of the sealing ring.