CN110061242A - Fuel cell current density measurement bipolar plates and its processing method - Google Patents
Fuel cell current density measurement bipolar plates and its processing method Download PDFInfo
- Publication number
- CN110061242A CN110061242A CN201811125984.0A CN201811125984A CN110061242A CN 110061242 A CN110061242 A CN 110061242A CN 201811125984 A CN201811125984 A CN 201811125984A CN 110061242 A CN110061242 A CN 110061242A
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- China
- Prior art keywords
- printed circuit
- circuit board
- current density
- conductive sheet
- insulating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/88—Processes of manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/0276—Sealing means characterised by their form
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The invention belongs to fuel cell test technical fields, are related to fuel cell current density measurement bipolar plates and its processing method.Resistance is installed, resistance both ends are connected to two printed circuit board through-hole sides, and printed circuit board insertion is mounted in two insulating frames, obtain current density test bipolar plates in the through-hole using two printed circuit boards.Resistance is small in size, precision is high and temperature coefficient is small, can improve measurement accuracy；Installation by adhering, which is avoided that, has an impact battery structure, can reduce the bipolar plate thickness of test, be easily installed in pile any position, realizes the current density measurement of pile interior three-dimensional space any position；Keep wiring neat, reliable using printed circuit board, be avoided that each area's short circuit phenomenon occur, reduces assembly complexity, voltage acquisition wiring when contact pin socket facilitates current density to measure is opened up on printed circuit board；Conductive sheet is installed on printed circuit board can realize runner processing.
Description
Technical field
The invention belongs to fuel cell test technical fields, are to be related to fuel cell current density measurement more specifically
Bipolar plates and its processing method.
Background technique
Fuel cell is the power generator for the chemical energy in fuel being converted directly by electrochemical reaction electric energy.Fuel
Battery has gone through more than 100 years courses from invention so far.Since energy and environment have become what human society was depended on for existence
Important Problems, since nearly 20 years, this energy conversion device efficiently, clean of fuel cell has obtained national governments, developer
And the most attention of research institution, it is civilian in communications and transportation, portable power, dispersion power station, aerospace and underwater hiding-machine etc.
Wide application prospect is shown with military domain.
The current density of fuel battery inside is the electrochemistry under the effect of the factors such as reactant in battery, temperature and water distribution
The comprehensive of reaction embodies, if current density is unevenly distributed, shows that each region utilization rate of active area is unbalanced, to produce
Electric current in the difference of raw local voltage and face, causes loss of potential.Furthermore when membrane electrode via hole, it is existing that reversion can occur for current density
As.
Online subregion current density measuring technology can in real time, accurately test the current density point of fuel cell part
Cloth designs and avoids to decay due to membrane electrode to reflect the difference of the electrochemical reaction of inside battery to cell flow-field is improved
The serious accident that via hole causes is of great significance.
The test of estimated current density mainly has inertia network resistor method, printed circuit board method and Hall sensor method, lazy
Property network resistor method be mainly used for monocell current density test, printed circuit board method due to print thickness limitation can not processing stream
Road thus cannot function as bipolar plates place pile inside any position carry out current density measurement；Hall sensor is pacified inside pole plate
It fills complex steps and detection accuracy is not high, the current density detection of any position inside improper pile.
Summary of the invention
The purpose of the present invention is to provide fuel cell current density measurement bipolar plates and its processing methods, existing to solve
The current density test device of technology is only used for the test of monocell current density, cannot function as appointing inside bipolar plates placement pile
Meaning position carries out current density measurement, the technical problem that installation steps are cumbersome and detection accuracy is not high.
To achieve the above object, the technical solution adopted by the present invention is that: it is double to provide a kind of fuel cell current density measurement
Pole plate, comprising:
Two printed circuit boards being stacked, the printed circuit board have the welding section in matrix distribution, two pieces of institutes
The welding section for stating printed circuit board corresponds distribution, and the printed circuit board is offered to be led to correspondingly with the welding section
The through-hole correspondence in hole, two pieces of printed circuit boards is connected；The printed circuit board is equipped with corresponding with each welding section
The circuit trace of electrical connection, the printed circuit board offer contact pin socket in the end of the circuit trace；
In the resistance that matrix is distributed, the quantity phase of the quantity of the resistance and the welding section of a printed circuit board
It is respectively arranged in the corresponding through-hole of two pieces of printed circuit boards Deng, the resistance, and the both ends difference of the resistance
It is electrically connected to the through-hole side of two pieces of printed circuit boards；
In two groups of conductive sheets that matrix is distributed, the correspondence of conductive sheet described in every group is electrically connected to the printed circuit board
The lateral surface of each welding section, the conductive sheet are covered in the corresponding through-hole；And
Two insulating frames being stacked, each insulating frame all have for accommodating a printed circuit
The mounting groove of plate, two insulating frame sandwicheds, two pieces of printed circuit boards, the insulating frame is in the mounting groove
Bottom surface is offered for corresponding the mounting hole for accommodating the conductive sheet, and the mounting hole is corresponded with the welding section and set
It sets, the quantity of the mounting hole of an insulating frame is equal with the quantity of the welding section of a printed circuit board, described
Insulating frame is formed with the insulation muscle for making the adjacent conductive sheet insulation, the insulation muscle between the adjacent mounting hole
Lateral surface and the lateral surface of the conductive sheet offer runner jointly, the insulating frame offers runner hole；
The wherein welding section, right of a conductive sheet in conductive sheet described in one group, the corresponding printed circuit board
It is corresponding in the resistance answered, the corresponding welding section of another described printed circuit board, conductive sheet described in another set
The conductive sheet be connected in series, form a subregion two conductive sheet regions；The fuel cell current is close
Degree test bipolar plates have multiple subregions in matrix distribution.
Further, insulating cement is filled between the conductive sheet and the insulation muscle；
Insulating cement is filled between the insulating frame and the printed circuit board.
Further, the printed circuit board is equipped with two circuit traces of electrical connection corresponding with each welding section；
The resistance uses four-wire measurement, and corresponding two welding sections are respectively set two test points and form two pairs of test points,
Middle a pair test point supplies two welding sections of access as electric current, and another pair of test point is for measuring voltage
And it is respectively arranged on two welding sections.
Further, the printed circuit board has installing arm, and the circuit trace extends to the installing arm, described to insert
Needle socket is opened in the installing arm；The insulating frame offers the via hole passed through for the installing arm.
Further, the printed circuit board has at least two installing arms；The peace of two pieces of printed circuit boards
Dress arm is arranged in a staggered manner.
Further, the both ends of the resistance are electrically connected by welding in the through-hole side of two pieces of printed circuit boards
Face；
Conductive sheet described in every group is by welding the corresponding each welding section for being electrically connected to the printed circuit board
Lateral surface.
Further, the printed circuit board offers and the one-to-one filling slot in the welding section, the filling slot
It is interior to be filled with scolding tin.
The present invention provides a kind of processing method of fuel cell current density measurement bipolar plates, comprising the following steps:
S1) printed circuit board welding positioning: the printed circuit board has location hole, by two pieces of printed circuit boards
Location hole is aligned and welds positioning；
S2 the both ends of resistance) resistance welding: are respectively welded at the corresponding through-hole side of two pieces of printed circuit boards
Face；
S3) conductive sheet welds: scolding tin is arranged in welding section, molten state is heated to electric iron butt welding tin, by conductive sheet lid
The welding section is gone up and is aligned in, the outer surface with electric iron in conductive sheet heats, until conductive sheet is welded in the welding
Area repeats the above movement until all conductive sheet welding finish；
S4 printed circuit board) is installed on one of them described insulating frame: the printing of conductive sheet and resistance will be welded with
Circuit board is installed in the mounting groove of one of them insulating frame；
S5 it) vacuumizes in the mating surface gluing of insulating frame and repeatedly: coating insulation in the mating surface of two insulating frames
Glue, and the bubble in discharge insulating cement is repeatedly vacuumized in vacuum oven；
S6 it) assembles another insulating frame and is put into after folder is flat in fixture and fix drying: by another insulation
Frame is assembled to the insulating frame for being equipped with the printed circuit board, with fixture that two insulating frame folders are smooth
It closes, and fixture locking is put into baking oven and is dried；
S7 it) the lateral surface gluing to one of insulating frame in two insulating frames and repeatedly vacuumizes: in conduction
Insulating cement is filled between piece and insulating frame, and vacuumizes the bubble in discharge insulating cement, forms assembly；
S8) assembly after vacuumizing is put into fix after folder is flat in fixture and is dried: clamping one layer of side surface patch in fixture
The assembly that side is coated with insulating cement and completion vacuumizes is put into press from both sides in fixture and be put down, will be put into after fixture locking by antisticking adhesive tape
It is dried in baking oven；
S9 it) vacuumizes to another lateral surface gluing of assembly and repeatedly: by the non-coated face of assembly in step S7)
Insulating cement is filled between conductive sheet and insulating frame and is repeatedly vacuumized；
S10) be put into fix after folder is flat in fixture by the assembly after vacuumizing and dry: operation is the same as step S8)；
S11 milling flat) is carried out to assembly two sides and is machined to predetermined size；
S12) to the assembly processing flow channel and runner hole after milling flat；
S13) gold-plated to the fuel cell current density measurement bipolar plates after processing.
Further, it in step S7), is insulated using glue rifle cooperation syringe needle to filling between conductive sheet and insulating frame
Glue；If insulating cement is insufficient after vacuumizing, glue will be carried out to part and be vacuumized again, up to insulating cement fills up and no longer
There is bubble.
Further, in step S13), the nickel layer that thickness range is 0.1um to 3um is first plated, then plating thickness range is
The 18K layer gold of 0.1um to 3um.
Resistance is installed in the through-hole having the technical effect that using two printed circuit boards of the present invention compared with the existing technology,
And resistance both ends are connected to the through-hole side of two printed circuit boards, and printed circuit board insertion is mounted on two insulation sides
A composite plate is formed in frame, and current density test bipolar plates can be obtained.The resistance of use is with small in size, precision is high and warm
The very small advantage of coefficient is spent, the measurement accuracy of current density can be greatly improved, this external resistance installation steps is simple, operation difficulty
It is small；Embedded installation, which is avoided that, has an impact battery structure, while can greatly reduce current density test bipolar plates
The current density measurement of pile interior three-dimensional space any position is realized in thickness, the very convenient any position for being mounted on pile,
It measures reliable and stable；Wiring can be made neat, reliable using printed circuit board, be avoided that each area's short circuit phenomenon occur, subtract significantly
Assembly complexity is lacked, low manufacture cost opens up electricity when the very convenient current density measurement of contact pin socket on printed circuit board
Pressure acquisition wiring；Conductive sheet is installed on printed circuit board may be implemented the processing of runner, solve directly to use printed circuit board very well
When copper foil too thin the problem of being unable to processing flow channel.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is the three-dimensional installation diagram of fuel cell current density measurement bipolar plates provided in an embodiment of the present invention；
Fig. 2 is the main view of the fuel cell current density measurement bipolar plates of Fig. 1；
Fig. 3 is the stereogram exploded view of the fuel cell current density measurement bipolar plates of Fig. 1；
The main view for the insulating frame applied in the fuel cell current density measurement bipolar plates that Fig. 4 is Fig. 3；
The main view for the printed circuit board applied in the fuel cell current density measurement bipolar plates that Fig. 5 is Fig. 3；
Fig. 6 is the partial enlarged view of the printed circuit board of Fig. 5；
Fig. 7 is the partial sectional view of the fuel cell current density measurement bipolar plates of Fig. 1；
Fig. 8 is the current density test result figure obtained with the fuel cell current density measurement bipolar plates of Fig. 1.
Specific embodiment
In order to which technical problems, technical solutions and advantages to be solved are more clearly understood, tie below
Accompanying drawings and embodiments are closed, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only
To explain the present invention, it is not intended to limit the present invention.
It should be noted that it can be directly another when element is referred to as " being fixed on " or " being set to " another element
On one element or indirectly on another element.When an element is known as " being connected to " another element, it can
To be directly to another element or be indirectly connected on another element.
It is to be appreciated that term " length ", " width ", "upper", "lower", "front", "rear", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "top", "bottom", "inner", "outside" is that orientation based on the figure or position are closed
System, is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must have
Specific orientation is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In description of the invention
In, the meaning of " plurality " is two or more, unless otherwise specifically defined.
Also referring to Fig. 1 to Fig. 7, first fuel cell current density measurement bipolar plates provided by the invention are said
It is bright.Fuel cell current density measurement bipolar plates include printed circuit board 10, resistance 20, conductive sheet 30, insulating frame 40.Two pieces
Printed circuit board 10 is stacked, and printed circuit board 10 has the welding section 11 in matrix distribution, two printed circuit boards 10
Welding section 11 corresponds distribution, and printed circuit board 10 offers and the one-to-one through-hole 12 in welding section 11, two bar printings electricity
The correspondence of through-hole 12 of road plate 10 is connected；Printed circuit board 10 is equipped with the circuit trace of electrical connection corresponding with each welding section 11
13, printed circuit board 10 offers contact pin socket 14 in the end of circuit trace 13；Resistance 20 is distributed in matrix, resistance 20
Quantity is equal with the quantity of welding section 11 of a printed circuit board 10, and it is right that resistance 20 is respectively arranged in two printed circuit boards 10
In the through-hole 12 answered, and the both ends of resistance 20 are electrically connected in 12 side of through-hole of two printed circuit boards 10；Two groups conductive
Piece 30 is distributed in matrix, the outside of the corresponding each welding section 11 for being electrically connected to a printed circuit board 10 of every group of conductive sheet 30
Face, conductive sheet 30 are covered in corresponding through-hole 12；Two insulating frames 40 are stacked, and each insulating frame 40, which all has, to be used for
Accommodate the mounting groove 41 of a printed circuit board 10, two 40 sandwiched of insulating frame, two printed circuit boards 10, insulating frame 40
It offers in the bottom surface of mounting groove 41 for corresponding the mounting hole 42 for accommodating conductive sheet 30, mounting hole 42 and welding section 11 1
One is correspondingly arranged, the quantity phase of the welding section 11 of a quantity and printed circuit board 10 of the mounting hole 42 of an insulating frame 40
The insulation muscle 43 for making adjacent conductive piece 30 insulate is formed between adjacent mounting hole 42 Deng, insulating frame 40, insulate muscle
43 lateral surface and the lateral surface of conductive sheet 30 offer runner 44 jointly, and insulating frame 40 offers runner hole 45；Wherein one
A conductive sheet 30, the welding section 11 of corresponding printed circuit board 10, corresponding resistance 20 in group conductive sheet 30, another
Corresponding conductive sheet 30 is connected in series in the corresponding welding section 11 of printed circuit board 10, another set conductive sheet 30, leads at two
Electric 30 region of piece forms a subregion P；Fuel cell current density measurement bipolar plates have multiple points in matrix distribution
Area P.
Using installation resistance 20 in the through-hole 12 of two printed circuit boards 10, and 20 both ends of resistance are connected to two prints
It is compound to be mounted on formation one in two insulating frames 40 by 12 side of through-hole of printed circuit board 10 for the insertion of printed circuit board 10
Current density test bipolar plates can be obtained in plate.The resistance 20 of use is with small in size, precision is high and temperature coefficient is very small
Advantage can greatly improve the measurement accuracy of current density, this 20 installation steps of external resistance is simple, and operation difficulty is small；It is Embedded
Installation is avoided that and has an impact to battery structure, while the thickness that can greatly reduce current density test bipolar plates (most thin can
To accomplish 2mm or less), the electricity of pile interior three-dimensional space any position is realized in the very convenient any position for being mounted on pile
Current density measurement, measures reliable and stable；Wiring can be made neat, reliable using printed circuit board 10, be avoided that each area of appearance is short
Road phenomenon, greatly reduces assembly complexity, low manufacture cost, opens up the very convenient electricity of contact pin socket 14 on printed circuit board 10
Voltage acquisition wiring when current density measures；Conductive sheet 30 is installed on printed circuit board 10 may be implemented the processing of runner 44, very
It solves the problems, such as directly to be unable to processing flow channel with copper foil when printed circuit board is too thin well.
When carrying out current density detection, current density test bipolar plates are mounted on position to be measured in pile, it then will be upper
The contact pin socket 14 of the detection interface (not shown) insertion printed circuit board 10 of position machine, is switched fast by existing control circuit
The voltage drop between corresponding two conductive sheets 30 of each subregion P or more is detected respectively, with voltage drop divided by 20 He of resistance of each subregion P
Area can calculate the current density size of each subregion P, that is, use following formula:
Wherein, J is current density, and I is each subregion electric current, and U is each subregion voltage drop, and R is the resistance of each subregion, and A is each
Division area size.
By obtaining current density test result figure shown in Fig. 8 after prior art data processing.Fuel cell current is close
The ingenious combination inertia network resistor method of degree test bipolar plates and printed circuit board method.
Printed circuit board 10 has location hole 15, is aligned and welds positioning for the location hole 15 of two printed circuit boards 10,
Inconsistent phenomenon occurs for printed circuit board 10 when can prevent other parts from welding in this way.The through-hole 12 of printed circuit board 10 is rectangular
Hole or round hole, are easily worked, convenient for 12 side of through-hole for being welded in printed circuit board 10 of 20 end of resistance.
Conductive sheet 30 is in rectangle, and the shape of welding section 11 is in rectangle, is easy molding, can be welded with very convenient conductive sheet 30
When positioning.Welding section 11 includes the frame shape portion 112 of rectangular portion 111 with a side for being connected to rectangular portion 111, rectangular portion 111
The fill area for filling scolding tin is inside offered, through-hole 12 is opened in frame shape portion 112, which is easy molding, convenient for conduction
Piece 30 is connected to welding section 11.
Resistance 20 can be Chip-R or chromatic circle resistance, with small in size, precision is high and temperature coefficient is very small
Advantage.Resistance size is not more than 10mm*10mm*2mm, and resistance is greater than 1W, can bear in 5~10 milliohms, resistor power
At least high current of 10A, while temperature temperature coefficient of resistance in 25 DEG C~120 DEG C variations is not more than 1%.Chip-R body
Product is 5mm*3mm*0.6mm.
Two groups of conductive sheets 30 are mutually not attached to.Conductive sheet 30 can for the good copper sheet of electric conductivity thermal conductivity, aluminium flake, silver strip or
Graphite flake.For insulating frame 40 using high temperature resistant, the insulated high-strength plastic production of anticorrosive and contamination-free release, material can be with
For PEI (polyetherimide), glass-fiber-plate etc..One of 40 upper surface of insulating frame is machined with anti-around three runner holes 45
The only filler slot 46 that gas mutually leaks.Each subregion P is separated by the insulation muscle 43 of insulating frame 40, and adjacent conductive piece 30 is mutually absolutely
Edge.
Runner 44 can may be cathode flow field for anode flow field, and 44 type of runner of processing can be arbitrary form.
It is gold-plated after being processed to the composite plate installed that current density test bipolar plates can be obtained.
Insulating frame 40 uses high-strength insulating material, can prevent the horizontal line of each subregion P current density from flowing, and excludes each
Current density detection error caused by the horizontal line flowing of area's electric current, furthermore highstrenghtpiston's insulating frame energy strengthening electric current density is surveyed
The intensity of bipolar plates is tried, guarantees to be not crushed at seal groove when current density test bipolar plates assembly.Two insulating frames 40
Printed circuit board 10 is encapsulated among mounting groove 41 by bonding and forms composite construction board.Two printed circuit boards 10 and two
A corresponding the sum of overall thickness of conductive sheet 30 up and down is equal to the sum of two 40 thickness of insulating frame, can guarantee printing electricity in this way
30 outer surface of conductive sheet and corresponding 40 outside of insulating frame are concordant after the insertion installation of road plate 10, so that overall structure thickness is small.
Further, a kind of specific embodiment party as fuel cell current density measurement bipolar plates provided by the invention
Formula is filled with insulating cement between conductive sheet 30 and insulation muscle 43, filled with insulation between insulating frame 40 and printed circuit board 10
Glue.Insulating cement bonding force is strong, high temperature resistant, anticorrosive, realizes insulation and sealing.Using bonding, secured, high temperature resistant (is applicable in insulating cement
- 40 DEG C of temperature~140 DEG C), the one-component epoxy resin of corrosion resistance or other structures glue, be able to achieve current density test
The trapping function of the two sides of insulation and current density test bipolar plates between each subregion P of bipolar plates.
Further, Fig. 5, Fig. 6 are please referred to, one as fuel cell current density measurement bipolar plates provided by the invention
Kind specific embodiment, printed circuit board 10 are equipped with two circuit traces 13 of electrical connection corresponding with each welding section 11；Resistance
20 use four-wire measurement, and corresponding two welding sections 11 are respectively set two test points and form two pairs of test points, and one pair of them are surveyed
Pilot supplies two welding sections 11 (i.e. the both ends of resistance 20) of access as electric current, another pair of test point for measuring voltage and
It is respectively arranged on two welding sections 11 and is arranged close to the both ends of resistance 20.Test point ratio as measurement voltage is supplied as electric current
Test point closer to the end of resistance 20, including a pair of of test point as measurement voltage, a pair of as electric current supply is surveyed
Pilot is outside.Corresponding printed circuit board 10 respectively draws two circuit traces 13 and arrives contact pin socket 14 up and down, it is convenient to installation after
Each subregion P resistance 20 carries out Accurate Calibration.The resistance value of resistance 20 varies with temperature, and the resistance value of resistance 20 is measured using four-wire method,
Eliminate the influence of measurement line resistance.Since the impedance of measurement voltage circuit is very high, the electric current for flowing through voltage lead is very small, can be with
It ignores, thus the resistance value of measured resistance is equal to voltage that voltage lead measures divided by the electric current by current feed,
Lead resistance bring error is effectively eliminated, realizes the precise measurement of measured resistance resistance value.Accurate calibration is used for this method at any time
Resistance value of each resistance 20 of current density measurement under any operation temperature, guarantees 20 both end voltage of precise measurement resistance
Drop avoids temperature interference that current density is caused to calculate error.
Further, Fig. 1, Fig. 3, Fig. 5, Fig. 6 are please referred to, it is double as fuel cell current density measurement provided by the invention
A kind of specific embodiment of pole plate, printed circuit board 10 have installing arm 16, and circuit trace 13 extends to installing arm 16, contact pin
Socket 14 is opened in installing arm 16；Insulating frame 40 offers the via hole 47 passed through for installing arm 16.The structure is convenient for will be upper
The contact pin socket 14 of the detection interface insertion printed circuit board 10 of machine, is easily installed arm 16 and is assemblied in insulating frame 40, so that whole
Body structural thickness is small.
Further, a kind of specific embodiment party as fuel cell current density measurement bipolar plates provided by the invention
Formula, printed circuit board 10 have at least two installing arms 16.The installing arm 16 of two printed circuit boards 10 is arranged in a staggered manner.The structure
It is easy molding, easy assembly, convenient for dividing the contact pin socket 14 of the detection interface insertion printed circuit board 10 of host computer more
Area P carries out current density test.It is distributed with installing arm 16 in the two sides of printed circuit board 10, convenient for by the detection of host computer
Interface is inserted into the contact pin socket 14 of printed circuit board 10, carries out current density test to more multi partition P.
Further, a kind of specific embodiment party as fuel cell current density measurement bipolar plates provided by the invention
The both ends of formula, resistance 20 are electrically connected by welding in 12 side of through-hole of two printed circuit boards 10；The structure is easy into
Type realizes the two electrical connection.Every group of conductive sheet 30 is by welding the corresponding each welding for being electrically connected to a printed circuit board 10
The lateral surface in area 11.The structure is easy molding, realizes the two electrical connection.
Further, Fig. 5 and Fig. 6 is please referred to, as fuel cell current density measurement bipolar plates provided by the invention
A kind of specific embodiment, printed circuit board 10 offer with the one-to-one filling slot 17 in welding section 11, fill out in filling slot 17
Filled with scolding tin.For filling slot 17 in I-shaped, scolding tin is coated in the one end of filling slot 17 far from resistance 20, facilitates and accommodates enough scolding tin
Conductive sheet 30 is welded, while filling out tin in filling slot 17 to increase the maximum current value that each subregion P is born.With electric iron to filling
Scolding tin in slot 17 carries out being heated to molten state, and conductive sheet 30 is then covered preparatory cloth on simultaneously printed aligned circuit board 10 rapidly
The welding section 11 set, and be adjusted to 400 DEG C of 17 corresponding positions of upper surface filling slot in conductive sheet 30 with electric iron and heated, directly
Printed circuit board 10 is soldered to the fitting completely of conductive sheet 30.
The present invention also provides the processing methods of any of the above-described embodiment fuel cell current density measurement bipolar plates, including with
Lower step:
S1) the welding of printed circuit board 10 positioning: printed circuit board 10 has location hole 15, by two printed circuit boards 10
Location hole 15 is aligned and welds positioning；Inconsistent phenomenon occurs for printed circuit board 10 when can prevent other parts from welding in this way.
S2) resistance 20 welds: the both ends of resistance 20 are respectively welded at corresponding 12 side of through-hole of two printed circuit board 10
Face, it is ensured that resistance 20 is not short-circuited；
S3) conductive sheet 30 welds: scolding tin is set in welding section 11, is heated to molten state with electric iron butt welding tin, it will be conductive
Piece 30 covers and is aligned in welding section 11, is adjusted to 400 DEG C of outer surfaces in conductive sheet 30 with electric iron and heats, until conductive
Piece 30 is welded in welding section 11, repeats the above movement until the welding of all conductive sheets 30 finishes；
S4 printed circuit board 10) is installed on one of insulating frame 40: conductive sheet 30 and resistance 20 will be welded with
Printed circuit board 10 is installed in the mounting groove 41 of one of insulating frame 40, and is guaranteed without interference；
S5 it) vacuumizes in 48 gluing of mating surface of insulating frame 40 and repeatedly: in the mating surface 48 of two insulating frames 40
Insulating cement is coated, and repeatedly vacuumizes the bubble in discharge insulating cement in vacuum oven, until being generated there is no bubble；
S6 it) assembles another insulating frame 40 and is put into after folder is flat in fixture and fix drying: by another side of insulating
Frame 40 is assembled to the insulating frame 40 for being equipped with printed circuit board 10, and two insulating frames 40 are pressed from both sides smooth conjunction with fixture, and
Fixture locking is put into baking oven and is dried；Baking oven setup parameter is to dry to dry at 4h or 100 DEG C at 80 DEG C to dry at 2h or 120 DEG C
30min；
S7 it) the lateral surface gluing to one of insulating frame 40 in two insulating frames 40 and repeatedly vacuumizes:
Insulating cement is filled between conductive sheet 30 and insulating frame 40, and vacuumizes the bubble in discharge insulating cement, forms assembly；
S8) assembly after vacuumizing is put into fix after folder is flat in fixture and is dried: clamping one layer of side surface patch in fixture
The assembly that side is coated with insulating cement and completion vacuumizes is put into press from both sides in fixture and be put down, will be put into after fixture locking by antisticking adhesive tape
It is dried in baking oven；The technological parameter of drying is the same as step S6).Antisticking adhesive tape is polytetrafluoroethylene (PTFE) antisticking adhesive tape.Fixture folder is flat to be had
Effect prevents assembly caused by expanding with heat and contract with cold in drying course due to insulating cement to be bent.It repeatedly vacuumizes and drying operation is effectively kept away
The gluing bring internal flaw exempted from increases the intensity of current density test bipolar plates.
S9 it) vacuumizes to another lateral surface gluing of assembly and repeatedly: by the non-coated face of assembly in step S7)
Insulating cement is filled between conductive sheet 30 and insulating frame 40 and is repeatedly vacuumized；Concrete operations are identical as step S7).
S10) be put into fix after folder is flat in fixture by the assembly after vacuumizing and dry: operation is with step S8), because insulating
The mobility extraordinary stage can be undergone in glue drying course, assembly two sides gluing will lead to be lost towards following insulating cement, therefore
Can not gap to assembly two sides carry out gluing simultaneously, gluing operation can only be carried out to the face of assembly upward, be painted with drying
Afterwards by face directed downwardly turn to upward repeat step S7), S8)；
S11 milling flat) is carried out to assembly two sides and is machined to predetermined size；It is with lathe that gluing drying rear surface residual is more
The current density of remaining insulating cement tests the bipolar advanced row plane rough milling of board assembly, then carries out plane finish milling processing, until
Assembly body thickness reaches predetermined size；Current density test bipolar plate surfaces after assembling are processed by finish-milling, and flatness is little
In 0.02mm.
S12) to the assembly processing flow channel 44 and runner hole 45 after milling flat；With vacuum chuck to the dress after finish-milling plane
Ligand carry out clamping, then with carving and milling machine in the features such as its surface processing flow channel 44 and runner hole 45, processing flow channel hole 45 not
Mill and wear, otherwise will cause sucker gas leakage can not clamping, the processing of runner hole 45 should process toward centre from two sides and stay more than 0.2mm
Amount, ligand to be installed with pocket knife are cut off 44 mouthfuls of runner of machining allowance after removing from vacuum chuck.
S13) gold-plated to the fuel cell current density measurement bipolar plates after processing.Gold-plated operation can prevent current density
The corrosion of conductive sheet 30 in test process.
Using installation resistance 20 in the through-hole 12 of two printed circuit boards 10, and 20 both ends of resistance are connected to two prints
It is compound to be mounted on formation one in two insulating frames 40 by 12 side of through-hole of printed circuit board 10 for the insertion of printed circuit board 10
Current density test bipolar plates can be obtained in plate.The resistance 20 of use is with small in size, precision is high and temperature coefficient is very small
Advantage can greatly improve the measurement accuracy of current density, this 20 installation steps of external resistance is simple, and operation difficulty is small；It is Embedded
Installation, which is avoided that, has an impact battery structure, while can greatly reduce the thickness of current density test bipolar plates, very just
Just it is mounted on any position of pile, realizes the current density measurement of pile interior three-dimensional space any position, measurement stabilization can
It leans on；Wiring can be made neat, reliable using printed circuit board 10, be avoided that each area's short circuit phenomenon occur, greatly reduce assembly
Complexity, low manufacture cost, voltage when opening up the measurement of the very convenient current density of contact pin socket 14 on printed circuit board 10 are adopted
Collect wiring；Conductive sheet 30 is installed on printed circuit board 10 may be implemented the processing of runner 44, solve directly to use printed circuit very well
Copper foil too thin the problem of being unable to processing flow channel when plate.
Further, a kind of tool as the processing method of fuel cell current density measurement bipolar plates provided by the invention
Body embodiment fills insulating cement between conductive sheet 30 and insulating frame 40 using glue rifle cooperation syringe needle in step S7)；
If insulating cement is insufficient after vacuumizing, glue will be carried out to part and will be vacuumized again, until insulating cement fills up and no longer goes out
Existing bubble, easy to operate, filling effect is good.The time vacuumized is generally 15min~30min or so.
Further, a kind of tool as the processing method of fuel cell current density measurement bipolar plates provided by the invention
Body embodiment first plates the nickel layer that thickness range is 0.1um to 3um in step S13), and then plating thickness range is 0.1um
To the 18K layer gold of 3um.Nickel plating can increase the binding force of gold with conductive sheet 30, and plating 18K gold can increase the wearability of layer gold.
Gold plated copper sheets substitute graphite and carry out afflux with good thermally conductive and electric conductivity, and performance is even better than graphite bi-polar plate.Specifically,
The nickel layer for first plating 3um thickness, then plates the 18K layer gold of 1um thickness, can effectively improve binding force and wearability.
The above is merely preferred embodiments of the present invention, be not intended to limit the invention, it is all in spirit of the invention and
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within principle.
Claims (10)
1. fuel cell current density measurement bipolar plates characterized by comprising
Two printed circuit boards being stacked, the printed circuit board have the welding section in matrix distribution, two pieces of prints
The welding section of printed circuit board corresponds distribution, the printed circuit board offer with the one-to-one through-hole in the welding section,
The through-hole correspondence of two pieces of printed circuit boards is connected；The printed circuit board is equipped be electrically connected corresponding with each welding section
The circuit trace connect, the printed circuit board offer contact pin socket in the end of the circuit trace；
In the resistance that matrix is distributed, the quantity of the resistance is equal with the quantity of the welding section of a printed circuit board, institute
It states resistance to be respectively arranged in the corresponding through-hole of two pieces of printed circuit boards, and the both ends of the resistance are electrically connected
In the through-hole side of two pieces of printed circuit boards；
In two groups of conductive sheets that matrix is distributed, the correspondence of conductive sheet described in every group is electrically connected to each of the printed circuit board
The lateral surface of the welding section, the conductive sheet are covered in the corresponding through-hole；And
Two insulating frames being stacked, each insulating frame all have for accommodating the printed circuit board
Mounting groove, two insulating frame sandwicheds, two pieces of printed circuit boards, the insulating frame is in the bottom surface of the mounting groove
It offering for corresponding the mounting hole for accommodating the conductive sheet, the mounting hole is arranged in a one-to-one correspondence with the welding section,
The quantity of the mounting hole of one insulating frame is equal with the quantity of the welding section of a printed circuit board, the insulation
Frame is formed with the insulation muscle for making adjacent conductive sheet insulation between the adjacent mounting hole, the insulation muscle it is outer
The lateral surface of side and the conductive sheet offers runner jointly, and the insulating frame offers runner hole；
The wherein welding section, corresponding of a conductive sheet in conductive sheet described in one group, the corresponding printed circuit board
Corresponding institute in the resistance, the corresponding welding section of another described printed circuit board, conductive sheet described in another set
Conductive sheet series connection is stated, forms a subregion two conductive sheet regions；The fuel cell current density is surveyed
Trying bipolar plates has the multiple subregions being distributed in matrix.
2. fuel cell current density measurement bipolar plates as described in claim 1, which is characterized in that the conductive sheet with it is described
Insulating cement is filled between insulation muscle；
Insulating cement is filled between the insulating frame and the printed circuit board.
3. fuel cell current density measurement bipolar plates as described in claim 1, which is characterized in that the printed circuit board is set
There are two circuit traces of electrical connection corresponding with each welding section；The resistance uses four-wire measurement, corresponding two institutes
It states welding section and two test points two pairs of test points of formation is respectively set, test point described in one pair of them is as electric current supply access two
A welding section, another pair of test point is for measuring voltage and being respectively arranged on two welding sections.
4. fuel cell current density measurement bipolar plates as described in claim 1, which is characterized in that the printed circuit board tool
There is installing arm, the circuit trace extends to the installing arm, and the contact pin socket is opened in the installing arm；The insulation side
Frame offers the via hole passed through for the installing arm.
5. fuel cell current density measurement bipolar plates as claimed in claim 4, which is characterized in that the printed circuit board tool
There are at least two installing arms；The installing arm of two pieces of printed circuit boards is arranged in a staggered manner.
6. such as fuel cell current density measurement bipolar plates described in any one of claim 1 to 5, which is characterized in that the electricity
The both ends of resistance are electrically connected by welding in the through-hole side of two pieces of printed circuit boards；
Conductive sheet described in every group is by welding the outer of the corresponding each welding section for being electrically connected to the printed circuit board
Side.
7. such as fuel cell current density measurement bipolar plates described in any one of claim 1 to 5, which is characterized in that the print
Printed circuit board offer with the one-to-one filling slot in the welding section, scolding tin is filled in the filling slot.
8. the processing method of fuel cell current density measurement bipolar plates as described in any one of claim 1 to 7, feature exist
In, comprising the following steps:
S1) printed circuit board welding positioning: the printed circuit board has location hole, by the positioning of two pieces of printed circuit boards
Hole is aligned and welds positioning；
S2 the both ends of resistance) resistance welding: are respectively welded at the corresponding through-hole side of two pieces of printed circuit boards；
S3) conductive sheet welds: scolding tin is arranged in welding section, is heated to molten state with electric iron butt welding tin, conductive sheet is covered simultaneously
It is aligned in the welding section, the outer surface with electric iron in conductive sheet heats, until conductive sheet is welded in the welding section, weight
The multiple above movement is finished until all conductive sheet welding；
S4 printed circuit board) is installed on one of them described insulating frame: the printed circuit of conductive sheet and resistance will be welded with
Plate is installed in the mounting groove of one of them insulating frame；
S5 it) vacuumizes in the mating surface gluing of insulating frame and repeatedly: coating insulating cement in the mating surface of two insulating frames, and
The bubble in discharge insulating cement is repeatedly vacuumized in vacuum oven；
S6 it) assembles another insulating frame and is put into after folder is flat in fixture and fix drying: by another insulating frame
It is assembled to the insulating frame for being equipped with the printed circuit board, two insulating frames are pressed from both sides into smooth conjunction with fixture,
And fixture locking is put into baking oven and is dried；
S7) the lateral surface gluing to one of insulating frame in two insulating frames and repeatedly vacuumize: conductive sheet with
Insulating cement is filled between insulating frame, and vacuumizes the bubble in discharge insulating cement, forms assembly；
S8) assembly after vacuumizing is put into fix after folder is flat in fixture and is dried: is anti-sticking one layer of patch of fixture clamping side surface
The assembly that side is coated with insulating cement and completion vacuumizes is put into press from both sides in fixture and be put down, will be put into baking oven after fixture locking by adhesive tape
Middle drying；
S9 it) vacuumizes to another lateral surface gluing of assembly and repeatedly: by the conduction of the non-coated face of assembly in step S7)
Insulating cement is filled between piece and insulating frame and is repeatedly vacuumized；
S10) be put into fix after folder is flat in fixture by the assembly after vacuumizing and dry: operation is the same as step S8)；
S11 milling flat) is carried out to assembly two sides and is machined to predetermined size；
S12) to the assembly processing flow channel and runner hole after milling flat；
S13) gold-plated to the fuel cell current density measurement bipolar plates after processing.
9. the processing method of fuel cell current density measurement bipolar plates as claimed in claim 8, which is characterized in that in step
S7 in), using glue rifle cooperation syringe needle to filling insulating cement between conductive sheet and insulating frame；If insulating cement is insufficient after vacuumizing,
Glue will be carried out to part and will be vacuumized again, until insulating cement fills up and bubble no longer occurs.
10. the processing method of fuel cell current density measurement bipolar plates as claimed in claim 8, which is characterized in that in step
Rapid S13) in, the nickel layer that thickness range is 0.1um to 3um is first plated, the 18K layer gold that thickness range is 0.1um to 3um is then plated.
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| CN201811125984.0A CN110061242B (en) | 2018-09-26 | 2018-09-26 | Bipolar plate for testing current density of fuel cell and processing method thereof |
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| CN201811125984.0A CN110061242B (en) | 2018-09-26 | 2018-09-26 | Bipolar plate for testing current density of fuel cell and processing method thereof |
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| CN110676478A (en) * | 2019-10-14 | 2020-01-10 | 上海氢润新能源科技有限公司 | Collector plate for hydrogen fuel cell stack |
| CN111540926A (en) * | 2020-05-08 | 2020-08-14 | 电子科技大学 | Air-cooled fuel cell stack with anode side current distribution monitoring function |
| CN112068019A (en) * | 2020-09-08 | 2020-12-11 | 清华大学 | Flat-plate SOFC current density distributed end plate test structure and test method |
| CN113334582A (en) * | 2021-06-08 | 2021-09-03 | 一汽解放汽车有限公司 | Graphite bipolar plate processing device and processing method |
| CN113701824A (en) * | 2021-09-29 | 2021-11-26 | 中国科学院大连化学物理研究所 | Device and method for testing local current density-temperature distribution of fuel cell |
| CN114113750A (en) * | 2021-11-25 | 2022-03-01 | 同济大学 | Device and method for measuring current density of battery pole piece surface |
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