CN106898783A - A kind of fuel cell membrane electrode die-cutting apparatus and application method - Google Patents

Abstract

The present invention provides a kind of fuel cell membrane electrode die-cutting apparatus, and the device is made up of die cut systems, vacuum generating system, light source alignment system, pressure system, fuselage.Die cut systems include cutting die and lower bolster, and lower deep gouge is opened according to diffusion layer size on lower bolster, and membrane electrode can be fixed using the lower deep gouge.The usage of the device is：(1) cutting die mechanism is installed, " one " word light source position is calibrated；(2) membrane electrode is placed on lower bolster, adjustment membrane electrode position starts vacuum suction and fixes membrane electrode；(3) membrane electrode that will be fixed moves to cutting die lower section, starts pressure system and completes cross cutting action；(4) membrane electrode being punched is taken out.The equipment may insure that sprue hole and internal trip bolt/positioning port are accurate relative to diffusion layer position on membrane electrode, are conducive to improve production efficiency and Performance data.

Description

A fuel cell membrane electrode die-cutting device and using method

technical field

The invention belongs to the technical field of fuel cells, and in particular relates to a fuel cell membrane electrode die-cutting device.

Background technique

A fuel cell is a power generation device that directly converts chemical energy into electrical energy through an electrochemical reaction. It has the characteristics of high energy conversion efficiency and environmental friendliness. It is considered to be the preferred clean and efficient power generation technology in the 21st century.

Membrane electrodes are where electrochemical reactions take place, where chemical energy in the fuel is directly converted into electrical energy. A battery with only one membrane electrode cannot meet the demand for external high-power consumption, so it is necessary to connect multiple single cells in series to form a stack. The electric stack is generally composed of dozens to hundreds of single cells. These single cells are stacked together by direct stacking or flat laying, plus current collector plates, insulating plates and end plates, and fastened by screws or clips. Composition of fuel cell stacks.

The quality of fuel cell stack assembly has a very important impact on the performance of the battery. The stack assembly process will affect the internal resistance of the stack and the uneven distribution of fuel due to stress. When tens to hundreds of single cells are stacked to form a stack, it is necessary to cut out the fuel flow port and the internal fastening screw/positioning port on the membrane electrode of each single cell. The position of the fuel flow channel opening and the internal screw opening relative to the diffusion layer requires high machining accuracy, which has a great impact on the performance and sealing of the entire stack. The main manifestations are: 1. If each single cell is not well positioned during assembly, assembly misalignment will occur, which will cause uneven stress inside the fuel cell stack, affect the seal and even damage the membrane electrode assembly and bipolar plate. 2. The accumulation of positioning and processing tolerances will cause distortion when assembling the battery pack. This distortion will cause relative displacement between the MEA component and the bipolar plate, affect the size and shape of the common flow channel, and cause uneven fluid distribution between the cells. , affecting the stack performance. Existing equipment is insufficient to meet the needs of fuel cells for membrane electrode tailoring.

Contents of the invention

The purpose of the present invention is to provide a fuel cell membrane electrode die-cutting device for the deficiencies in the prior art, to ensure that the position of the main channel hole on the membrane electrode and the internal fastening screw/positioning port are accurate relative to the diffusion layer, and to improve the production efficiency. efficiency. The present invention adopts following technical scheme to realize:

A fuel cell membrane electrode die-cutting device, including a die-cutting system fixed on a frame, a vacuum generating system, a light source positioning system, and a pressure system;

The die-cutting system includes more than one blade fixed on the bracket to form a knife mold and a lower backing plate, the lower backing plate is placed on a fixed frame, the knife mold is located above the lower backing plate, the blade on the knife mold and the The lower backing plate is oppositely arranged, the lower backing plate is a flat plate, a first groove with the same shape and size as the cross section of the electric plate to be cut is opened on the upper surface of the flat plate, and a cross section and the same shape and size as the film electric plate to be cut are opened in the middle area of the bottom of the first groove. The second groove with the same shape and size as the diffusion layer of the electric plate has a through hole at the bottom of the first groove around the area where the second groove is located, and the electrode to be cut can be fixed by the groove; the through hole and the vacuum generating system connected;

The light source positioning system is fixedly connected with the knife mold; the pressure system is connected with the knife mold transmission.

The vacuum generating system is a vacuum pump or an air pump; the vacuum generating system is mainly used to fix the membrane electrode and prevent the membrane electrode from moving during the die-cutting process.

The light source positioning system is a light source that can emit two or more intersecting "one" light rays for positioning the membrane electrode to be cut; the light source positioning system can detect the position of the membrane electrode to be cut on the membrane electrode, and use The servo motor connected with the lower plate fixing frame realizes the adjustment of the position of the membrane electrode.

The pressure system provides power for the die cutter, which can be a motor, an air pump or a hydraulic press to move the die die up and down, and the force application process includes two steps of pre-pressurization and pressurization.

The method for using the fuel cell membrane electrode die-cutting device includes the following steps:

(1) Install the knife mold mechanism and calibrate the position of the "one" light source;

(2) Place the membrane electrode in the first groove of the lower backing plate, adjust the position of the membrane electrode, and start vacuum adsorption to fix the membrane electrode;

(3) Move the lower backing plate on which the membrane electrode is fixed to the bottom of the knife die, and start the pressure system to complete the die-cutting action;

(4) Take out the die-cut membrane electrode.

The present invention uses the position limiting method, the light source positioning system, the vacuum adsorption fixation, and the method of segmented force application to carry out a punching on the membrane electrode. Accurate position, and limited to improve production efficiency, improve stack performance.

Description of drawings

Fig. 1 schematic diagram of fuel cell membrane electrode die-cutting device;

Figure 2 Schematic diagram of the lower backing plate.

detailed description

The fuel cell membrane electrode die-cutting device of the present invention will be further described below in conjunction with the accompanying drawings and examples.

Example 1

The fuel cell membrane electrode die-cutting device is composed of a die-cutting system, 1. a vacuum generating system, 2. a light source positioning system, 3. a pressure system, 4. a fuselage, and 5. The die-cutting system includes a knife die and a lower backing plate, 100, a sinking groove is opened on the lower backing plate according to the size of the diffusion layer, 101, the membrane electrode can be fixed by the sinking groove, and the lower backing plate also includes vacuum adsorption holes, 102, positioning Pin hole, 103, membrane electrode outer frame sinking groove, 104.

The usage of the die-cutting device is as follows: (1) install the knife mold mechanism, calibrate the position of the "one" light source; (2) place the membrane electrode on the lower backing plate, adjust the position of the membrane electrode, and start the vacuum adsorption to fix the membrane electrode; (3) ) Move the fixed membrane electrode to the bottom of the knife die, start the pressure system to complete the die-cutting action; (4) Take out the punched membrane electrode.

Claims (5)

1. A fuel cell membrane electrode die-cutting device, characterized in that: it includes a die-cutting system fixed on the frame, a vacuum generating system, a light source positioning system, and a pressure system; The die-cutting system includes more than one blade fixed on the bracket to form a cutting die and a lower backing plate, the lower backing plate is placed on a fixed frame, the cutting die and the lower backing plate are arranged oppositely, and the lower backing plate is a flat plate The upper surface of the plate is provided with a first groove with the same cross-section as the shape and size of the membrane electric board to be cut, and a second groove with the same cross-section and the same shape and size as the diffusion layer of the membrane electric board to be cut is opened in the middle area of the bottom of the first groove. Groove, a through hole is opened at the bottom of the first groove around the area where the second groove is located, and the electrode to be cut can be fixed by the groove; the through hole is connected with the vacuum generation system; the light source positioning system is fixedly connected with the die; the pressure The system is connected with the cutter die transmission. 2. According to the said fuel cell membrane electrode die-cutting device of claim 1, it is characterized in that: the vacuum generating system is a vacuum pump or an air pump; the vacuum generating system is mainly used to fix the membrane electrode and prevent the membrane electrode from moving during the die-cutting process. 3. The fuel cell membrane electrode die-cutting device according to claim 1, characterized in that: the light source positioning system is a light source capable of emitting more than two intersecting "one" light rays for positioning the membrane electrode to be cut ; The light source positioning system can detect the position of the part of the membrane electrode to be cut on the membrane electrode, and realize the adjustment of the position of the membrane electrode by means of the servo motor connected with the lower plate fixing frame. 4. According to the fuel cell membrane electrode die-cutting device described in claim 1, it is characterized in that: the pressure system provides power for the die cutter, which can be a motor or an air pump or a hydraulic press, and the process of applying force includes preloading and boosting. Press two steps. 5. A method for using the fuel cell membrane electrode die-cutting device described in claims 1-4, characterized in that: (1) Install the knife mold mechanism and calibrate the position of the "one" light source; (2) Place the membrane electrode in the first groove of the lower backing plate, adjust the position of the membrane electrode, and start vacuum adsorption to fix the membrane electrode; (3) Move the lower backing plate on which the membrane electrode is fixed to the bottom of the knife die, and start the pressure system to complete the die-cutting action; (4) Take out the die-cut membrane electrode.