CN113161571A

CN113161571A - Plastic-coated current collecting plate and fuel cell

Info

Publication number: CN113161571A
Application number: CN202010076638.9A
Authority: CN
Inventors: 梁鹏; 程敬德; 赵树钊; 麦建明; 唐厚闻; 李红涛
Original assignee: Shanghai H Rise New Energy Technology Co Ltd
Current assignee: Shanghai H Rise New Energy Technology Co Ltd
Priority date: 2020-01-23
Filing date: 2020-01-23
Publication date: 2021-07-23

Abstract

The invention relates to a plastic-coated current collecting plate and a fuel cell, wherein the current collecting plate comprises a current collecting inner plate and a plastic-coated shell, a reaction contact boss is arranged in the central area of the current collecting inner plate, an extraction end is arranged at one end of the current collecting inner plate, the plastic-coated shell is coated outside the current collecting inner plate, a boss opening and an extraction end opening are arranged on the plastic-coated shell, the reaction contact boss is embedded into the boss opening, so that the plastic-coated shell and the reaction contact boss form a plane integrally, and the extraction end extends out of the extraction end opening. Compared with the prior art, the invention can improve the sealing property and the insulating property of the collector plate, so that the reaction substance of the battery is not contacted with the plate core module in the working process, and the complete insulating effect is achieved.

Description

Plastic-coated current collecting plate and fuel cell

Technical Field

The invention relates to the technical field of fuel cells, in particular to a plastic-coated current collecting plate and a fuel cell.

Background

The proton exchange membrane fuel cell is an electrochemical device which decomposes anode hydrogen into protons and electrons through a catalyst, the protons reach a cathode through a proton exchange membrane, the electrons reach the cathode through an external circuit, and the electrons, the protons and oxygen generate water under the catalysis of a cathode catalyst.

In the proton exchange membrane fuel cell, current collecting plates are arranged at the upper end and the lower end of a reactor core to realize the output of positive and negative electrodes of current. However, the conventional collecting plate is formed of a single metal plate, and the size thereof is also the same as the size of the cross-sectional area in the core, and the following problems are liable to occur: the sealing and insulating effect of the whole metal plate is poor, and particularly, complete insulation cannot be achieved at the part of a common pipeline where the current collecting plate is in contact with substances such as reactants, tail gas and coolant. Therefore, during the use of the fuel cell, the collector plates may contact with the reactant materials to generate corrosion and electrolysis, thereby causing the metal ions of the membrane electrode in the core to be contaminated, and thus seriously affecting the performance and service life of the stack.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a plastic-coated current collecting plate and a fuel cell.

The purpose of the invention can be realized by the following technical scheme:

the utility model provides a package moulds formula current collector, moulds the casing including the mass flow inner panel and package, the central zone of mass flow inner panel be equipped with reaction contact boss to be equipped with in the one end of mass flow inner panel and draw forth the end, the package mould the casing parcel outside the mass flow inner panel, be equipped with the boss opening on the package moulds the casing and draw forth the end opening, reaction contact boss embedding boss opening for the package moulds the casing and react contact boss and form a plane, draw forth the end and stretch out from drawing forth the end opening part.

Furthermore, cooling water through holes and reaction gas through holes are formed in the periphery of the flow collecting inner plate, and the plastic coated shell covers the cooling water through holes and the reaction gas through holes to form a cooling water inlet and a cooling water outlet and a reaction gas inlet and a reaction gas outlet.

Furthermore, the plastic-coated shell adopts a plastic shell or a rubber shell.

Furthermore, the plastic-coated shell is coated outside the flow collecting inner plate by adopting an injection molding process.

Further, the reaction contact boss is shaped and sized to cover a flow field area of a core to which it is connected.

Furthermore, a conductive coating is arranged on the reaction contact boss.

Further, the shape of the reaction contact boss is rectangular or elliptical.

A fuel cell integrates the plastic-coated current collecting plate in the fuel cell.

Compared with the prior art, the invention has the following advantages:

1. according to the invention, the current collecting plate with a traditional single metal plate structure is reconstructed through the current collecting inner plate and the plastic coated shell, so that the original current-guiding work of the current collecting plate can be realized through the reaction contact boss, and the sealing property and the insulating property of the current collecting plate at the peripheral common pipeline part can be improved through the plastic coated shell, so that a reaction substance is not contacted with the plate core module in the working process of the battery, and the effect of complete insulation is achieved; meanwhile, the insulation mode can ensure that the strength of the collector plate is not changed while the insulation performance is improved.

2. The reaction contact boss is provided with a conductive coating used for reacting contact resistance between the contact boss and the interior of the battery, so that the conductivity of the current collecting inner plate is improved.

Drawings

Fig. 1 is a structural schematic diagram of a plastic-coated current collecting plate.

Fig. 2 is a schematic structural view of a plastic-coated current collecting plate at another angle.

Fig. 3 is a schematic structural diagram of a current-collecting inner plate.

Fig. 4 is a structural schematic diagram of the plastic-coated shell.

Reference numerals: 1. the flow collecting inner plate comprises a flow collecting inner plate 11, a reaction contact boss 12, a leading-out end 13, a cooling water through hole 14, a reaction gas through hole 2, a plastic coated shell 21, a boss opening 22, a leading-out end opening 23, a cooling water inlet, a cooling water outlet, a cooling water inlet and a cooling water outlet 24.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

Example one

As shown in fig. 1 and 2, the present embodiment provides a plastic-coated current collecting plate, which includes a current collecting inner plate 1 and a plastic-coated housing 2. The central area of the inner collecting plate 1 is provided with a reaction contact boss 11, and one end of the inner collecting plate 1 is provided with a leading-out terminal 12. The plastic-coated shell 2 is wrapped outside the flow collecting inner plate 1, a boss opening 21 and a leading-out end opening 22 are arranged on the plastic-coated shell 2, and the reaction contact boss 11 is embedded into the boss opening 21, so that the plastic-coated shell 2 and the reaction contact boss 11 are integrally formed into a plane, and the leading-out end 12 extends out of the leading-out end opening 22.

In this embodiment, the cooling water through holes 13 and the reaction gas through holes 14 are formed around the collector inner plate 1. The plastic coated shell 2 covers the cooling water through holes 13 and the reaction gas through holes 14 to form cooling water inlet and outlet 23 and reaction gas inlet and outlet 24. As shown in fig. 1, the elongated holes on the upper and lower sides of the reaction contact boss 11 are outlets and inlets for cooling water, and the irregular holes on the left and right sides of the reaction contact boss 11 are inlets and outlets for air and hydrogen. Specifically, the upper left corner is a hydrogen inlet, and the other two holes on the left side are air outlets; the lower right corner is a hydrogen outlet, and the other two holes on the right side are air inlets.

The shape and area of the reaction contact boss 11 on the inner collecting plate 1 can cover the flow field area of the reactor core connected with the inner collecting plate, and can be in various geometric shapes such as an oval shape and a rectangular shape, and the rectangular shape is adopted in the embodiment, so that the plate core module 1 can be ensured to be in good contact with the flow field area. The reaction contact boss 11 is provided with a conductive coating for reducing the contact resistance between the reaction contact boss 11 and the inside of the battery and improving the conductivity of the current collector.

The plastic-coated shell 2 is generally a plastic shell or a rubber shell. In the embodiment, plastic nylon is adopted and wrapped outside the inner collecting plate 1 through an injection molding process. The plastic nylon shell has good strength and toughness and good insulation effect. In order to facilitate injection molding, injection molding holes are also formed in the flow collecting inner plate 1.

Example two

The embodiment provides a fuel cell which comprises a shell, a plastic-coated current collecting plate and a core. The plastic-coated collector plate in the embodiment is divided into an upper collector plate and a lower collector plate, and the upper collector plate and the lower collector plate are respectively arranged at the upper end and the lower end of the reactor core. The core is structurally identical to the existing fuel cell core and is therefore not deployed. The structure of the upper end current collecting plate is the same as that of the plastic-coated current collecting plate in the first embodiment. The structure of the lower end collecting plate is similar to that of the plastic-coated collecting plate in the first embodiment, and the difference is that the plastic-coated collecting plate is not provided with a cooling water inlet and a cooling water outlet and a reaction gas inlet and a reaction gas outlet. The reactor core with plastic-coated current collecting plates arranged at two ends is integrally installed in the shell. The fuel cell with the structure improves the sealing property and the insulating property of the fuel cell at the peripheral pipeline part through the insulating plate module, so that the reaction materials of the cell can not contact with the plate core module in the working process, the complete insulating effect is achieved, the phenomena of corrosion and electrolysis caused by the contact of the current collecting plate and the reactant materials are avoided, and the performance and the service life of the galvanic pile are improved.

The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims

1. The utility model provides a plastic-coated current collecting plate, characterized in that moulds casing (2) including mass flow inner panel (1) and package, the central zone of mass flow inner panel (1) be equipped with reaction contact boss (11) to be equipped with in the one end of mass flow inner panel (1) and draw forth end (12), the package mould casing (2) parcel outside mass flow inner panel (1), be equipped with boss opening (21) and draw forth end opening (22) on the plastic-coated casing (2), reaction contact boss (11) embedding boss opening (21) for the package moulds casing (2) and reaction contact boss (11) and form a plane wholly, draw forth end (12) and stretch out from drawing forth end opening (22).

2. The plastic-coated current collecting plate according to claim 1, wherein the periphery of the current collecting inner plate (1) is provided with cooling water through holes (13) and reaction gas through holes (14), and the plastic-coated shell (2) covers the cooling water through holes (13) and the reaction gas through holes (14) to form a cooling water inlet/outlet (23) and a reaction gas inlet/outlet (24).

3. The plastic-coated current collecting plate of claim 1, wherein the plastic-coated casing (2) is a plastic casing or a rubber casing.

4. The plastic-coated current collecting plate of claim 1, wherein the plastic-coated shell (2) is coated outside the current collecting inner plate (1) by injection molding.

5. A plastic-coated collector plate according to claim 1, wherein the reaction contact boss (11) is shaped and sized to cover a flow field area of a core to which it is connected.

6. A plastic-coated collector plate according to claim 1, wherein said reactive contact pads (11) are provided with an electrically conductive coating.

7. A plastic-coated collector plate according to claim 1, wherein said reaction contact boss (11) is rectangular or oval in shape.

8. A fuel cell incorporating the plastic-coated current collector of any one of claims 1 to 7.