CN219246729U

CN219246729U - Bipolar plate carbon felt combined structure and bipolar plate roller pressing mechanism

Info

Publication number: CN219246729U
Application number: CN202320490729.6U
Authority: CN
Inventors: 张博
Original assignee: Baoding Zhengnian Composite Material Technology Co ltd
Current assignee: Baoding Zhengnian Composite Material Technology Co ltd
Priority date: 2023-03-15
Filing date: 2023-03-15
Publication date: 2023-06-23
Anticipated expiration: 2033-03-15

Abstract

The utility model discloses a bipolar plate carbon felt combined structure, which comprises a bipolar plate and a carbon felt plate, wherein the bipolar plate is made of conductive plastic sheets, the middle parts of two large surfaces of the bipolar plate are subjected to hot melting to form a composite carbon felt plate, conical protrusions are arranged in the region where the large surfaces of the bipolar plate are overlapped with the carbon felt plate, and the number of the conical protrusions is multiple and are uniformly and regularly distributed in the region; the height of the conical bulge is smaller than the thickness of the carbon felt plate. The utility model also provides a bipolar plate roller pressing mechanism which comprises a pressing roller, wherein the two pressing rollers are arranged in pairs and oppositely rotate to press the extruded conductive plastic sheet, a plurality of cone groove bodies are uniformly distributed on the roller surface of the pressing roller, and the shape of the cone groove bodies is consistent with that of the cone protrusions. The bipolar plate carbon felt combined structure can reduce the contact resistance between the bipolar plate and the carbon felt and improve the composite strength between the bipolar plate and the carbon felt. The bipolar plate roller pressing mechanism can generate a bipolar plate with conical protrusions.

Description

Bipolar plate carbon felt combined structure and bipolar plate roller pressing mechanism

Technical Field

The utility model relates to the technical field of flow battery production detection equipment, in particular to a bipolar plate carbon felt combined structure and a bipolar plate roller pressing mechanism.

Background

The liquid flow energy storage battery is low in cost, high in efficiency and environment-friendly, and has the advantages of high energy density and current efficiency, simplicity and easiness in operation, long service life, low cost and the like. The main flow batteries at present mainly comprise all-vanadium flow batteries, zinc-bromine flow batteries, iron-chromium flow batteries and the like, and are mainly applied to the fields of renewable energy power generation such as grid peak shaving, wind energy, solar energy and the like, electric automobiles and the like. The flow battery of the industrialization level forms a pile in a mode of stacking and connecting a plurality of groups of units in series, wherein an electrode plate is a negative electrode of a previous battery unit and a positive electrode of a next battery unit, so that the flow battery is called a bipolar plate.

In the running process of the flow battery, a carbon felt needs to be pressed in a liquid flow cavity between the bipolar plate and the diaphragm to serve as a diffusion reaction electrode, and current needs to be conducted through internal electrolyte and contact between the carbon felt and the polar plate, so that better contact conductivity, namely lower contact resistance, is required between the carbon felt and the polar plate surface, and a better energy transfer effect is fed back. The bipolar plate adopts a carbon-added conductive sheet (hereinafter collectively referred to as conductive plastic sheet) of a thermoplastic resin substrate as a polar plate, and can achieve better toughness. The connection modes of the carbon felt and the conductive plastic sheet mainly comprise bonding, resistance welding and hot melting, wherein the conductive adhesive bonding is easy to realize but has larger bonding resistance; the resistance welding mode is easy to generate the situation that the local overheat is not bonded locally, and the composite quality is not stable; although the hot-melt method has a long processing time, the bonding surface is continuous and stable with respect to the resistance welding method. However, in the process of compounding the carbon felt by adopting the hot melting mode, the bipolar plate of the conductive plastic sheet has the defects of low thickness of the thermal compounding connecting layer and larger contact resistance of the bonding layer due to bonding between the plane and the rough surface.

Accordingly, there is a need to develop a bipolar plate carbon felt composite structure and bipolar plate roller press mechanism that address the above-described problems.

Disclosure of Invention

The utility model aims to provide a bipolar plate carbon felt combined structure which can reduce the contact resistance between a bipolar plate and a carbon felt and improve the composite strength between the bipolar plate and the carbon felt.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the utility model relates to a bipolar plate carbon felt combined structure, which comprises a bipolar plate and a carbon felt plate, wherein the bipolar plate is made of conductive plastic sheets, the carbon felt plate is compounded by hot melting the middle parts of two large surfaces of the bipolar plate, conical protrusions are arranged in the region where the large surfaces of the bipolar plate are overlapped with the carbon felt plate, and the conical protrusions are distributed uniformly and regularly in the region; the height of the conical protrusions is smaller than the thickness of the carbon felt plate.

Further, the conical protrusion is conical or pyramid-shaped, and the tip of the conical protrusion is arranged outwards.

Further, the height of the conical protrusion is not more than 5 mm.

The bipolar plate roller pressing mechanism is used for processing the bipolar plate with any bipolar plate carbon felt combined structure, and comprises a pressing roller after the extrusion process of the conductive plastic sheet, wherein the two pressing rollers are arranged in pairs and oppositely rotate to press the extruded conductive plastic sheet, a plurality of cone groove bodies are uniformly distributed on the roller surface of the pressing roller, and the shape of the cone groove bodies is consistent with that of the cone protrusions.

Further, still include release agent spray assembly, release agent spray assembly's quantity is two correspond respectively and set up two compression roller one side, release agent spray assembly includes guard shield, nozzle and spray tube, the horn-shaped opening orientation of guard shield compression roller outer wall and along length direction setting, the spray tube leads to the length setting and is in on the guard shield bottom plate, a plurality of the nozzle sets up in the guard shield and root intercommunication is in on the spray tube, spray tube one end pipeline intercommunication release agent delivery pump.

Further, the nozzle is an atomizing nozzle, a curled edge is arranged on the bottom shell side of the protective cover, and a recovery pipe joint which faces to the set edge is arranged at one end of the curled edge.

Compared with the prior art, the utility model has the beneficial technical effects that:

according to the carbon felt combined structure of the bipolar plate, the conical protrusions which are regularly arranged are arranged on the side face of the bipolar plate, when the bipolar plate and the carbon felt plate are subjected to hot melting and compounding, the positions of the conical protrusions are fused with surrounding carbon felt fibers after the conical protrusions are subjected to hot melting, meanwhile, the large face of the bipolar plate and the bottom face of the carbon felt plate are also subjected to hot melting, the conical protrusions have an auxiliary anchoring effect, the thermal compounding area between the bipolar plate and the carbon felt plate is increased, the compounding strength is increased, and the compounding resistance is reduced.

In addition, through rationally setting up protruding bottom surface of toper and cross-section shape size, can make the toper protruding easy carbon felt board of inserting, do not influence the product size after the complex.

According to the bipolar plate roller pressing mechanism, the conductive plastic sheet extruded by the extruder is printed and rolled through the paired pressing rollers, so that the thickness of the conductive plastic sheet can be reduced, and meanwhile, the conical protrusions can be machined, namely, an online machining mode is adopted, so that the efficiency is not reduced too much compared with that of the light plate electrode plate. Through release agent sprays the setting of subassembly, can spray release agent to the compression roller in the rotation process, avoid the fashioned toper arch bonding in the awl cell body of roll-in-process, influence the stamp roll-in next time. Through setting up at the drain pan limit one end of guard shield the release agent that falls on the guard shield inner wall can be retrieved, running cost is reduced.

Drawings

The utility model is further described with reference to the following description of the drawings.

FIG. 1 is a schematic perspective view of a bipolar plate carbon felt assembly according to the present utility model;

FIG. 2 is a schematic diagram of a cross-sectional front view of a bipolar plate carbon felt composite structure of the present utility model;

FIG. 3 is a schematic view of a bipolar plate according to the present utility model;

fig. 4 is a schematic perspective view of a compression roller of the bipolar plate compression roller mechanism of the present utility model;

fig. 5 is a schematic perspective view of a bipolar plate press roller mechanism of the present utility model.

Reference numerals illustrate: 1. a bipolar plate; 101. a conical protrusion; 2. a carbon felt plate; 3. a press roller; 301. a cone groove; 4. a shield; 5. a spray pipe.

Detailed Description

The utility model provides a bipolar plate carbon felt combined structure, which can reduce the contact resistance between a bipolar plate and a carbon felt and improve the composite strength between the bipolar plate and the carbon felt.

The following description of the embodiments of the present utility model will be made in detail with reference to the accompanying drawings, wherein it is apparent that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Referring to the drawings, fig. 1 is a schematic perspective view of a bipolar plate carbon felt combination structure of the present utility model; FIG. 2 is a schematic diagram of a cross-sectional front view of a bipolar plate carbon felt composite structure of the present utility model; FIG. 3 is a schematic view of a bipolar plate according to the present utility model; fig. 4 is a schematic perspective view of a compression roller of the bipolar plate compression roller mechanism of the present utility model; fig. 5 is a schematic perspective view of a bipolar plate press roller mechanism of the present utility model.

Example 1

As shown in fig. 1 to 3, a bipolar plate carbon felt composite structure comprises a bipolar plate 1 and a carbon felt plate 2, wherein the bipolar plate 1 is made of an extruded conductive plastic sheet. The middle parts of the two large surfaces of the bipolar plate 1 are thermally fused with the composite carbon felt plate 2, the region of the large surface of the bipolar plate 1, which is overlapped with the carbon felt plate 2, is provided with conical protrusions 101, and the conical protrusions 101 are a plurality of and are uniformly and regularly distributed in the region. The height of the conical protrusions 101 is smaller than the thickness of the carbon felt plate 2.

Through setting up the toper protruding 101 of regular arrangement on bipolar plate 1's side, when carrying out hot melt complex to bipolar plate 1 and carbon felt board 2, the carbon felt fibre that the position hot melt back and surrounding of toper protruding 101 fuses together, and the big face of bipolar plate 1 also fuses together with carbon felt board 2 bottom surface simultaneously, and toper protruding 101 has supplementary anchor effect, has increased the heat complex area between bipolar plate 1 and the carbon felt board 2, has not only increased the complex intensity, has reduced the complex resistance moreover.

In a specific implementation of this embodiment, the conical protrusion 101 has a conical shape or a pyramid shape, and the tip of the conical protrusion 101 is disposed outward.

Specifically, the height of the tapered protrusion 101 is not more than 5 mm, and the diameter or length of the bottom surface of the tapered protrusion 101 is smaller than the height of the tapered protrusion 101.

By reasonably setting the bottom surface and the cross-sectional shape size of the conical protrusion 101, the conical protrusion 101 can be easily inserted into the carbon felt plate 2, and the size of the compounded product is not affected.

According to the carbon felt combined structure of the bipolar plate, the conical protrusions 101 which are regularly arranged are arranged on the side face of the bipolar plate 1, when the bipolar plate 1 and the carbon felt plate 2 are subjected to hot melting and compounding, the positions of the conical protrusions 101 are fused with surrounding carbon felt fibers after hot melting, meanwhile, the large face of the bipolar plate 1 and the bottom face of the carbon felt plate 2 are also subjected to hot melting, the conical protrusions 101 have an auxiliary anchoring effect, the hot compounding area between the bipolar plate 1 and the carbon felt plate 2 is increased, the compounding strength is increased, and the compounding resistance is reduced. In addition, by reasonably setting the bottom surface and the cross-sectional shape size of the tapered protrusion 101, the tapered protrusion 101 can be easily inserted into the carbon felt plate 2 without affecting the size of the product after compounding.

Example 2

A bipolar plate roller pressing mechanism is used for processing a bipolar plate 1 with a bipolar plate carbon felt combined structure in the embodiment, and is arranged on a frame after an extrusion process of a conductive plastic sheet. The bipolar plate roller pressing mechanism comprises a pressing roller 3, wherein the two pressing rollers 3 are arranged in pairs, the two pressing rollers 3 are oppositely rotated to press extruded conductive plastic sheets, a plurality of cone groove bodies 301 are regularly arranged on the roller surface of the pressing roller 3, and the shape of the cone groove bodies 301 is consistent with that of cone protrusions 101.

It should be noted that the plurality of cone grooves 301 are regularly arranged on the roll surface of the press roll 3, and a white edge for cutting and separating adjacent bipolar plates is provided at the periphery of one cone groove 301.

The conductive plastic sheet extruded by the extruder just is printed and rolled through the press rollers 3 arranged in pairs, so that the conical protrusions 101 can be processed while the thickness of the conductive plastic sheet is reduced, namely, the online processing mode is adopted, and the efficiency is not reduced too much relative to the light plate electrode plate.

In a specific implementation manner of this embodiment, as shown in fig. 4 and fig. 5, the bipolar plate roller pressing mechanism of the present utility model further includes a release agent spraying assembly, where the number of the release agent spraying assemblies is two, and the release agent spraying assemblies are respectively and correspondingly disposed on one side of the two pressing rollers 3. The release agent spraying assembly comprises a shield 4, nozzles and a spray pipe 5, wherein a horn-shaped opening of the shield 4 faces the outer wall of the press roller 3 and is arranged along the length direction, the spray pipe 5 is arranged on a bottom plate of the shield 4 in a full length mode, a plurality of the nozzles are arranged in the shield 4 and are communicated with the spray pipe 5 at the root parts, and the spraying direction of the nozzles faces the outer wall of the press roller 3. One end of the spray pipe 5 is communicated with a release agent delivery pump through a pipeline.

Specifically, as shown in fig. 4 and 5, the nozzle is an atomizing nozzle, the bottom side of the cover 4 is provided with a curled edge, and one end of the curled edge is provided with a downward recovery pipe joint. And the collected release agent of the recovery pipe joint flows back to the release agent storage box through a pipeline.

Through the setting of release agent spray assembly, can spray release agent to the compression roller 3 of rotatory in-process, avoid the fashioned toper arch 101 bonding in the cone cell body 301 of roll-in-process, influence the stamp roll-in next time. Through setting up at the drain pan limit one end of guard shield 4 retrieve coupling, can retrieve the release agent that falls on guard shield 4 inner wall, reduce running cost.

It should be noted that before the bipolar plate 1 and the carbon felt plate 2 are bonded by hot melting, the surface of the bipolar plate 1 needs to be cleaned, so as to remove the release agent and avoid the adverse effect of the release agent on the hot melting compounding.

The working process of the bipolar plate roller pressing mechanism comprises the following steps: when the conductive plastic sheet just extruded from the extruder passes through two press rolls 3 arranged in pairs, the press rolls 3 print-roll the conductive plastic sheet. During the rolling process, the thickness of the conductive plastic sheet is reduced and the conical protrusion 101 is formed at the position of the conical groove 301. The conical projections 101 are zone-rolled onto the bipolar plate 1 sheet. In the rotation process of the press roller 3, the release agent spraying component continuously sprays release agent to the outer wall of the press roller 3, so that the occurrence of the sticking condition is avoided.

According to the bipolar plate roller pressing mechanism, the conductive plastic sheet extruded by the extruder is printed and rolled through the paired pressing rollers 3, so that the thickness of the conductive plastic sheet is reduced, and meanwhile, the conical protrusions 101 can be processed, namely, an online processing mode is adopted, so that the efficiency is not reduced too much compared with that of the light plate electrode plate. Through the setting of release agent spray assembly, can spray release agent to the compression roller 3 of rotatory in-process, avoid the fashioned toper arch 101 bonding in the cone cell body 301 of roll-in-process, influence the stamp roll-in next time. Through setting up at the drain pan limit one end of guard shield 4 retrieve coupling, can retrieve the release agent that falls on guard shield 4 inner wall, reduce running cost.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.

The above embodiments are only illustrative of the preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, and various modifications and improvements made by those skilled in the art to the technical solutions of the present utility model should fall within the protection scope defined by the claims of the present utility model without departing from the design spirit of the present utility model.

Claims

1. The bipolar plate carbon felt combined structure is characterized by comprising a bipolar plate (1) and a carbon felt plate (2), wherein the bipolar plate (1) is made of conductive plastic sheets, the carbon felt plate (2) is compounded in the middle of two large faces of the bipolar plate (1) by hot melting, conical protrusions (101) are arranged in the region where the large faces of the bipolar plate (1) are overlapped with the carbon felt plate (2), and the conical protrusions (101) are distributed uniformly and regularly in the region; the height of the conical protrusion (101) is smaller than the thickness of the carbon felt plate (2).

2. The bipolar plate carbon felt composite structure of claim 1, wherein: the conical protrusion (101) is conical or pyramid-shaped, and the tip of the conical protrusion (101) is arranged outwards.

3. The bipolar plate carbon felt composite structure of claim 2, wherein: the height of the conical protrusion (101) is not more than 5 mm.

4. A bipolar plate roller press mechanism, characterized in that: the bipolar plate (1) for processing the bipolar plate carbon felt combined structure according to any one of claims 1-3 is arranged after the extrusion process of the conductive plastic sheet and comprises press rolls (3), wherein two press rolls (3) are arranged in pairs and oppositely rotate to press the extruded conductive plastic sheet, a plurality of cone groove bodies (301) are uniformly distributed on the roll surface of the press rolls (3), and the shape of the cone groove bodies (301) is consistent with that of the cone protrusions (101).

5. The bipolar plate roller arrangement of claim 4 wherein: the mold release agent spraying device comprises a mold release agent spraying device, and is characterized by further comprising mold release agent spraying assemblies, wherein the mold release agent spraying assemblies are correspondingly arranged on one side of each of two pressing rollers (3), each mold release agent spraying assembly comprises a shield (4), a nozzle and a spray pipe (5), a horn-shaped opening of each shield (4) faces the outer wall of each pressing roller (3) and is arranged along the length direction, each spray pipe (5) is arranged on a bottom plate of each shield (4), a plurality of nozzles are arranged in each shield (4) and are communicated with each other at the root of each spray pipe on each spray pipe (5), and one end of each spray pipe (5) is communicated with a mold release agent conveying pump through a pipeline.

6. The bipolar plate roller arrangement of claim 5 wherein: the spray nozzle is an atomization spray nozzle, a curled edge is arranged on the bottom shell edge of the protective cover (4), and a recovery pipe joint which is arranged towards the curled edge is arranged at one end of the curled edge.