CN218182515U

CN218182515U - Inspection device and fuel cell stack

Info

Publication number: CN218182515U
Application number: CN202220149840.4U
Authority: CN
Inventors: 李红信; 王领; 张成平
Original assignee: Xiongchuan Hydrogen Technology Guangzhou Co ltd
Current assignee: Xiongchuan Hydrogen Technology Guangzhou Co ltd
Priority date: 2022-01-19
Filing date: 2022-01-19
Publication date: 2022-12-30
Anticipated expiration: 2032-01-19

Abstract

The utility model relates to a patrol and examine device and fuel cell pile, include: a connecting piece and a pin; the connecting piece is embedded into one edge of the bipolar plate, and one end of the contact pin is clamped with the joint of the connecting piece; the device of the utility model can not fall off due to vibration in the operation process, and has high stability; the structure of the contact pin enables the connection reliability of the inspection device to be improved, the contact pin has elasticity, the contact pin is tightly connected with the inner wall of the connecting piece, good conductivity and connection strength are guaranteed, and in addition, a baffle can be added to further prevent the contact pin from falling off; the inclined surface of the contact pin makes the insertion more convenient, and can make up errors generated in the process of processing the bipolar plate and assembling the fuel cell stack.

Description

Inspection device and fuel cell stack

Technical Field

The utility model relates to a battery technology field especially relates to an inspection device and fuel cell stack.

Background

As an important field of hydrogen energy utilization, the state of the art of fuel cell vehicles greatly affects hydrogen energy utilization. The fuel cell system engine is the most central component in a fuel cell automobile, and is the power heart of the fuel cell automobile. The fuel cell stack is the heart of the fuel cell system engine, and the working state of the fuel cell stack directly determines the running state of the fuel cell system engine.

The fuel cell stack is formed by stacking a plurality of single cells (in the order of hundreds), each single cell generates about 1V voltage when in operation, and the stack formed by stacking the single cells generates higher voltage to supply power to external loads. In order to obtain the operating state of the fuel cell stack, the voltage of each single cell in the stack needs to be detected, which requires that each single cell of the stack is connected to a detection device by a cable.

Due to the special requirements of the fuel cell stack on materials and the characteristic of small size of the fuel cell stack in the thickness direction, the traditional welding connection is completely incapable of operability, and a new connection structure form is urgently needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problem that traditional welding connection mode does not have maneuverability completely because the fuel cell galvanic pile has the special requirement on the material and the characteristic that the size of the thickness direction is small among the prior art, and providing a routing inspection device and a fuel cell galvanic pile.

In order to realize the purpose, the utility model adopts the following technical scheme:

an inspection device comprising:

a connecting piece and a pin;

the connecting piece is embedded into one edge of the bipolar plate, and one end of the contact pin is clamped with the joint of the connecting piece.

Specifically, the other end of the contact pin is clamped on the circuit board; or the other end of the contact pin is connected with a lead.

Specifically, the connecting piece comprises a T-shaped connecting piece, and a T-shaped joint of the T-shaped connecting piece is pre-embedded at one edge of the bipolar plate;

or the connecting piece and the bipolar plate are integrally formed.

Specifically, the contact pin comprises a head part, a middle part and a tail part; the head comprises an arc surface and an inclined surface; the middle part is provided with an elastic part; the tail part is provided with a stop block.

Specifically, the other end of connecting piece includes the through-hole, the middle part joint of contact pin is in the through-hole.

Specifically, a slope is further arranged between the main body of the connecting piece and the through hole, so that the center of the through hole is just positioned at the center of the thickness of the bipolar plate.

Specifically, a plurality of the routing inspection devices are arranged on the corresponding bipolar plates in a staggered manner from front to back.

A fuel cell stack including the inspection device, comprising:

a single cell and a polling device; the single cell comprises a bipolar plate and an MEA (membrane electrode assembly) membrane, and the bipolar plate and the MEA membrane are repeatedly arranged in sequence;

the inspection device is embedded in one edge of the bipolar plate of the monocell;

the inspection device comprises a connecting piece, a contact pin and a circuit board or a lead;

the connecting piece is embedded into one edge of the bipolar plate, one end of the contact pin is clamped with the joint of the connecting piece, the other end of the contact pin is clamped on the circuit board, or the other end of the contact pin is connected with a lead.

Specifically, when the bipolar plate is made of graphite, a T-shaped groove is arranged on the bipolar plate in advance;

or when the bipolar plate is made of metal, the connecting piece and the bipolar plate are integrally formed.

Specifically, the circuit board is connected with a cable and connected to the detection equipment through the cable.

Compared with the prior art, the utility model provides a patrol and examine device and fuel cell galvanic pile possesses following beneficial effect:

the connecting piece of pre-buried in the bipolar plate groove of graphite material can be inside big little design, reduces the risk that drops, when guaranteeing fine electric conductivity, possesses higher intensity and excellent toughness. The other end of the connecting piece forms a section of through hole through a metal plate forming process and is used for being matched with the contact pin; the connecting piece made of metal and the metal bipolar plate can be integrally formed, so that the stability of the device is improved.

Through the mode that connecting piece staggered arrangement around, obtain bigger connecting space, make things convenient for the contact pin to connect the operation promptly, also can avoid the operation to lead to the short circuit between the adjacent contact pin because of the vibration, be provided with the slope, make the jack just to the center of bipolar plate thickness.

The inspection device cannot fall off due to vibration in the operation process, and the stability is high; the structure of the contact pin enables the connection reliability of the inspection device to be improved, the contact pin has elasticity, the contact pin is tightly connected with the inner wall of the connecting piece, good conductivity and connection strength are guaranteed, and in addition, a baffle can be added to further prevent the contact pin from falling off; the inclined plane of contact pin makes when inserting more convenient, can compensate the error that appears in bipolar plate processing and the fuel cell pile assembling process, and foretell structure can integrate into the form of module, improves the installation effectiveness.

The device has the advantages that the device has the same or can be realized by adopting the prior art, the device can realize high stability in the operation process, the structure of the contact pin improves the connection reliability of the inspection device, the contact pin has elasticity, the contact pin is tightly connected with the inner wall of the connecting piece, good conductivity and connection strength are ensured, and in addition, a baffle can be added to further prevent falling off; the inclined plane of the contact pin makes the insertion more convenient, and can make up errors in the bipolar plate processing and fuel cell stack assembling processes.

Drawings

The above and other objects, features and advantages of exemplary embodiments of the present disclosure will become readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings. Several embodiments of the present disclosure are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar or corresponding parts and in which:

fig. 1 is a schematic view of an inspection device according to an embodiment of the present invention;

fig. 2 is a partial schematic view of an inspection device and a bipolar plate according to an embodiment of the present invention;

fig. 3 is a schematic view of a T-shaped connector according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a pin according to an embodiment of the present invention;

fig. 5 is a partial schematic view of a fuel cell stack according to an embodiment of the present invention;

fig. 6 is a partial schematic view of a fuel cell stack according to an embodiment of the present invention;

fig. 7 is a partial schematic view of a bipolar plate according to an embodiment of the present invention.

In the figure: connector 1, contact pin 2, circuit board 3, bipolar plate 4, MEA film 5, T-shaped joint 11, main body 12, through hole 13, slope 14, head 21, middle 22, tail 23, stop 24 and T-shaped groove 6.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some, but not all embodiments of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

Referring to fig. 1, the schematic diagram of the inspection device according to the embodiment of the present invention is shown, including:

the connector 1 is inserted with a pin 2;

specifically, as shown in fig. 2, the connecting member 1 is embedded in one edge of a bipolar plate 4, and one end of the contact pin 2 is engaged with a joint of the connecting member 1, wherein the bipolar plate 4 and the MEA membrane 5 are sequentially arranged.

In a specific example, referring to fig. 3, which shows a schematic diagram of a T-shaped connector according to an embodiment of the present invention, the connector 1 may include a T-shaped connector, the T-shaped connector includes a T-shaped joint 11, a main body 12 and a through hole 13; the T-shaped joint 11 of the T-shaped connecting piece is pre-embedded at one edge of the bipolar plate 4, namely the T-shaped joint 11 is electrically connected with the bipolar plate 4; further, the other end of the connecting piece 1 comprises a through hole 13, the middle part 22 of the pin 2 is clamped in the through hole 13, namely, the other end of the T-shaped connecting piece comprises the through hole 13, and the middle part 22 of the pin 2 is clamped in the through hole 13.

The T-shaped connecting piece can be embedded in the bipolar plate 4 when the two plates are bonded into the bipolar plate 4, the T-shaped connecting piece and the bipolar plate 4 can be reinforced in the bonding process through a special process, good contact is guaranteed, and the bipolar plate 4 made of graphite materials cannot be damaged. The T-shaped connecting piece pre-buried in the T-shaped groove of the bipolar plate made of graphite reduces the falling risk due to the large inside and the small outside. The T-shaped connecting piece is made of metal materials, so that good conductivity is guaranteed, and meanwhile the T-shaped connecting piece has high strength and excellent toughness. The other end of the T-shaped connecting piece forms a section of through hole 13 through the metal plate forming process, and the through hole is used for being matched with the contact pin 2.

It should be noted that the above-mentioned T-shaped connecting member and T-shaped groove are only an example of the present invention, and may further include other grooves with various shapes, such as L-shaped grooves, etc., and those skilled in the art may set the grooves with various shapes on the bipolar plate according to actual situations, which is not limited to the embodiments of the present invention.

In another embodiment, the bipolar plate 4 may also be made of a metal material, and at this time, the bipolar plate 4 made of a metal material may form a whole with the connecting member 1 in an integrated manner, so as to improve the stability of the device and the production efficiency, and certainly, the connecting member 1 may also be embedded into the bipolar plate 4 made of a metal material, that is, the bipolar plate 4 made of a metal material may also be provided with grooves of various shapes, so that the connecting member 1 may be embedded into the bipolar plate 4 made of a metal material.

In another preferred embodiment, a slope is also provided between the body 12 of the connector 1 and said through hole 13, so that the center of the through hole 13 is exactly in the center of the thickness of the bipolar plate 4.

Referring to fig. 4, a schematic diagram of a pin 2 according to an embodiment of the present invention is shown, where the pin 2 includes a head portion 21, a middle portion 22, and a tail portion 23; the head part 21 comprises an arc surface and an inclined surface; the middle part 22 is provided with an elastic piece; the tail 23 is provided with a stop 24.

The arc and the inclined plane of the head part 21 are smaller than the through hole 13 of the T-shaped connecting piece, so that the centering is convenient during connection, and the function of compensating errors is achieved; the elastic part of the middle part 22 enables the pin 2 to be compressed to generate elastic force when being inserted, so that the pin 2 is tightly and compactly matched with the inner wall of the through hole 13 of the T-shaped connecting piece to ensure good conductivity and connection strength; the stop 24 of the tail 23 has a positioning function to prevent the contact pin 2 from being inserted too far, and to avoid damaging the bipolar plate 4. The situation after pin 2 is inserted into the T-connector is shown in fig. 2.

In the embodiment of the utility model, the T-shaped connecting piece is pre-embedded in the bipolar plate 4, so that the connecting strength is improved, and the contact pin 2 can be prevented from being directly connected with the bipolar plate 4 made of brittle graphite material; the T-shaped metal connecting pieces are arranged in a staggered mode front and back to obtain a larger connecting space, so that the connecting operation of the contact pins 2 is facilitated, and short circuit between the adjacent contact pins 2 caused by vibration in the operation process can be avoided; the pin 2 includes a circular arc and a slope provided in the head portion 21 and an elastic portion provided in the middle portion 22, and is easy to insert, and the tail portion 23 includes a stopper 24 for preventing the insertion from being too deep.

Referring to fig. 5, a partial schematic diagram of a fuel cell stack according to an embodiment of the present invention is shown, including: a single cell and a polling device; the single cell comprises a bipolar plate 4 and an MEA (membrane electrode assembly) membrane 5, wherein the bipolar plate 4 and the MEA membrane 5 are repeatedly arranged in sequence; the electric pile of the fuel cell is formed by stacking a plurality of single cells, each single cell can generate a voltage when working, and the electric pile formed by stacking the single cells can generate a higher voltage to supply power to an external load; the voltage generated when the single cell operates is a voltage that varies within a small range.

In the utility model, the inspection device is embedded in one edge of the bipolar plate 4 of the monocell; the inspection device can comprise a connecting piece 1 and a pin 2; connecting piece 1 embedding bipolar plate 4 certain edge, contact pin 2's one end joint in connecting piece 1's joint, contact pin 2's the other end directly links to each other with the wire, on connecting external check out test set with a plurality of contact pins 2 through the wire, need not to set up the circuit board, makes the quantity of superimposed pile nimble changeable, improves the flexibility of pile equipment, makes the testing process swiftly convenient, reduce cost.

Further, the inspection device still includes circuit board 3, the one end joint of contact pin 2 in the joint of connecting piece 1, then the other end of contact pin 2 can also the joint on circuit board 3, through the integrated a plurality of connecting pieces of circuit board 3 1 and contact pin 2, be about to the integrated form as the module of inspection device, further improve the installation effectiveness.

The fuel cell stack is a cell formed by stacking a plurality of single cells, each single cell is formed by clamping an MEA (membrane electrode assembly) membrane 5 between two bipolar plates 4, the second bipolar plate 4 of the previous single cell can be used as the first bipolar plate 4 of the next single cell, and the bipolar plates 4 can be made of graphite materials or metal materials.

Specifically, the thickness of the bipolar plate 4 made of graphite is about 2 mm. Because graphite material bipolar plate 4 has better durability performance, the utility model discloses a device mainly can be to the inspection device of the pile of constituteing by graphite material bipolar plate 4.

As shown in fig. 5, a plurality of the inspection devices are arranged on the corresponding bipolar plate 4 in a staggered manner. The dislocation set mode around foretell inspection device is only the utility model discloses an example can also include other dislocation set modes, if two or three inspection device for the setting of staggering of a cycle, then according to a plurality of cycles cycle setting etc. can reach equally and prevent because of the space is too little between the inspection device, the problem that the mutual contact leads to the short circuit, the utility model discloses do not too much restriction to the concrete dislocation set mode of inspection device.

Due to the limitation of the process, the diameter of the pin 2 can be about 1.5mm at least at present. The graphite bipolar plate 4 is generally 2mm, and if the bipolar plates are directly arranged in sequence, the space is extremely tight, and even the situation that the bipolar plates cannot be arranged occurs. Therefore, 2T-connectors are designed, as shown in fig. 1 to 3, and each of the 2T-connectors has a slope, so that the center of the through hole 13 is located at the center of the thickness of the bipolar plate 4.

A larger connection space is obtained by the staggered arrangement, as shown in fig. 5. (the utility model discloses only described 2 a set of crisscross circumstances of arranging, but not limited to 3 or a plurality of a set of crisscross the arrangement) 2 a set of crisscross minimum distance of arranging 13 adjacent through-holes that is from 0.1mm to 2mm, greatly reduced the short circuit risk between 2 adjacent contact pins. Furthermore, if the pins 2 are inadvertently broken into the through holes 13, the pins 2 can be removed and the bipolar plate 4 is not damaged since the through holes 13 are external to the bipolar plate 4.

And welding a lead on the tail part 23 of the contact pin 2 to complete the whole inspection device. Moreover, the inclined plane and the circular arc of the head 21 of contact pin 2 possess the function of remedying processing and assembly error, refer to fig. 6, show the utility model discloses a local schematic diagram of a fuel cell pile can be with a plurality of contact pins 2 direct integration on a circuit board 3, and contact pin 2's the other end joint is on circuit board 3, and circuit board 3 still is connected with winding displacement and winding displacement connector, and circuit board 3 can be connected with the cable promptly, receives check out test set through the cable on, further improves the connection convenience, improves and detects the convenience.

In another embodiment, the other end of the contact pin 2 is directly connected with a lead, a circuit board is not needed, and the raw material cost is reduced.

Referring to fig. 7, a partial schematic view of a bipolar plate 4 according to an embodiment of the present invention is shown, wherein a T-shaped groove 6 is pre-arranged on the bipolar plate 4.

Specifically, the graphite bipolar plate 4 is actually composed of two plates, and the two plates are bonded to form the bipolar plate 4 through a special bonding process. When the single plate of the bipolar plate 4 is processed, a T-shaped groove can be processed on the single plate in advance, and when the plate with the T-shaped groove is matched to form the bipolar plate 4, a T-shaped groove 6 with a large inner part and a small outer part is formed.

For the graphite bipolar plate 4, the T-shaped connecting piece can be made of metal, has high strength and good toughness, can ensure the electrical conductivity through a proper bonding process and cannot damage the graphite bipolar plate 4; for the bipolar plate 4 made of metal, the T-shaped connecting piece can be formed together with the bipolar plate, and the T-shaped connecting piece can also be made of metal.

The T-shaped connecting piece is large in inside and small in outside, cannot fall off due to vibration in the operation process, and is high in reliability; the structure of the contact pin 2 ensures that the connection is reliable, the contact pin has elasticity, the contact pin is tightly connected with the inner wall of the connecting piece, good conductivity and connection strength are ensured, and a baffle can be added to further prevent the contact pin from falling off. The inclined surface of the contact pin 2 facilitates the insertion, and can make up for errors generated in the process of processing the bipolar plate 4 and assembling the galvanic pile; the contact pins 2 can be structurally integrated on the circuit board 3, and the circuit board 3 can lead the connection to the external detection equipment in the form of the contact pins 2.

In the above description of the present specification, the terms "fixed," "mounted," "connected," or "connected," and the like, are to be construed broadly unless otherwise expressly specified or limited. For example, with the term "coupled", it can be fixedly coupled, detachably coupled, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship. Therefore, unless the specification explicitly defines otherwise, those skilled in the art can understand the specific meaning of the above terms in the present invention according to specific situations.

In light of the foregoing description of the present specification, those skilled in the art will also understand that terms used herein, such as "upper," "lower," "front," "rear," "left," "right," "length," "width," "thickness," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," "center," "longitudinal," "lateral," "clockwise," or "counterclockwise," etc., indicate that such terms are based on the orientations and positional relationships illustrated in the drawings of the present specification, and are intended merely for the purpose of facilitating the description and simplifying the description, and do not explicitly or implicitly indicate that the device or element being referred to must have the particular orientation, be constructed and operated in the particular orientation, and therefore such terms are not to be understood or interpreted as limiting the scope of the present invention.

In addition, the terms "first" or "second", etc. used in this specification are used to refer to numbers or ordinal terms for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present specification, "plurality" means at least two, for example, two, three or more, and the like, unless explicitly specified otherwise.

While various embodiments of the present invention have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Numerous modifications, changes, and substitutions will occur to those skilled in the art without departing from the spirit and scope of the present invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed in practicing the invention. The following claims are intended to define the scope of the invention and, therefore, to cover module compositions, equivalents, or alternatives falling within the scope of these claims.

Claims

1. An inspection device, comprising:

a connecting piece and a pin;

the connecting piece is embedded into one edge of the bipolar plate, and one end of the contact pin is clamped and connected with the joint of the connecting piece;

the other end of the contact pin is clamped on the circuit board; or the other end of the contact pin is connected with a lead;

the contact pin comprises a head part, a middle part and a tail part; the head comprises an arc surface and an inclined surface; the middle part is provided with an elastic part; the tail part is provided with a stop block.

2. The inspection device according to claim 1, wherein the connector includes a T-connector, a T-connector of the T-connector being pre-embedded in one edge of the bipolar plate;

or the connecting piece and the bipolar plate are integrally formed.

3. The inspection device according to claim 2, wherein the other end of the connector includes a through hole, and the middle portion of the pin is engaged with the through hole.

4. The inspection device according to claim 3, wherein a ramp is also provided between the body of the connector and the through hole such that the center of the through hole is exactly centered in the thickness of the bipolar plate.

5. The inspection device according to claim 3, wherein a plurality of the inspection devices are arranged on the corresponding bipolar plates in a staggered manner.

6. A fuel cell stack including the inspection device according to any one of claims 1 to 5, comprising:

the connecting piece is embedded into one edge of the bipolar plate, one end of the contact pin is clamped on the joint of the connecting piece, and the other end of the contact pin is clamped on the circuit board, or the other end of the contact pin is connected with a lead.

7. The fuel cell stack according to claim 6, wherein when the bipolar plate is made of graphite, the bipolar plate is provided with a T-shaped groove in advance;

8. The fuel cell stack according to claim 6, wherein the circuit board is connected to a cable, and is connected to the detection device through the cable.