CN109596995A - Battery diaphragm electrical property measuring device and measuring method - Google Patents
Battery diaphragm electrical property measuring device and measuring method Download PDFInfo
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- CN109596995A CN109596995A CN201811642534.9A CN201811642534A CN109596995A CN 109596995 A CN109596995 A CN 109596995A CN 201811642534 A CN201811642534 A CN 201811642534A CN 109596995 A CN109596995 A CN 109596995A
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Abstract
The invention belongs to battery technology field more particularly to a kind of battery diaphragm electrical property measuring device and measuring method, and battery diaphragm electrical property measuring device includes: testing mould, including the first shell and second shell being oppositely arranged；Electrode slice, including first electrode sheet and second electrode sheet, the side of the first electrode sheet have the first protrusion for stretching out in the first shell, and the side of the second electrode sheet has the second protrusion for stretching out in the second shell；Septum clip, between the first shell and the second shell and for clamping battery diaphragm, in use, the septum clip is clamped between the first electrode sheet and the second electrode sheet.Since battery diaphragm being clamped using septum clip, septum clip is clamped between two electrode slices, and battery diaphragm will not touch the electrode slice of two sides, simultaneously, the setting of protrusion makes the thickness of battery diaphragm be easy measurement and calculate, and entire measurement process is simply, conveniently.
Description
Technical field
The invention belongs to battery technology field more particularly to a kind of battery diaphragm electrical property measuring device and measuring method.
Background technique
With the development of artificial intelligence and new energy industry, lithium ion battery consumer electronics product, Green Travel and
Demand in terms of green energy-storing increased dramatically.The primary clustering of lithium ion battery includes anode, cathode, electrolyte and diaphragm.Every
Though film is the non-active portion in battery, play a part of to separate positive and negative anodes, is guaranteeing that lithium ion is normally led between positive and negative anodes
Prevented while logical positive and negative anodes occur directly contact and it is short-circuit.Diaphragm is to the ducting capacity of lithium ion in electrolyte to battery electrical property
Can exist and directly affect, particularly important effect is also played in terms of cell safety.Therefore, diaphragm lithium ion conductivity is accurate
Measurement has great researching value to battery electrical property accurate evaluation.
Existing measuring device, the fixture for being used to clamp diaphragm mostly use greatly the side of assembly button Symmetrical cells (buckleing electricity)
Formula, since the sealing of button electricity itself needs certain pressure, this squeezes electrode to diaphragm, to diaphragm pore structure and thickness effect
It is larger, measurement inaccuracy is caused, while pressure lot stability and personal operational consistency are poor.Moreover, button electricity is internal
Contact resistance can not also deduct, secondly, largely, the consistency that button Denso is matched has been more than diaphragm itself to ionic conductance
The influence of rate.The device of other improvements is while try to by reducing electrode to the pressure of diaphragm or surveying by the way that laminated diaphragm is cumulative
Examination, but still it is difficult to ensure that laminated diaphragm is smooth to be in close contact and is parallel to each other to electrode, in addition, the mistake of the cumulative test of laminated diaphragm
Journey is also more complicated.Furthermore the electrolyte infiltration and the presence of blibbing between laminated diaphragm can also cause very measurement result
The accuracy of big error, measurement is low；Since existing diaphragm is all micron level, existing measuring device cannot be to the two poles of the earth
Spacing carries out high-acruracy survey between piece, and then influences the accuracy of test result.
Summary of the invention
The purpose of the present invention is to provide a kind of battery diaphragm electrical property measuring devices, it is intended to solve electricity in the prior art
The larger technical problem of pond diaphragm conductivity measurement error.
To achieve the above object, the technical solution adopted by the present invention is that: a kind of battery diaphragm electrical property measuring device, packet
It includes.
Testing mould, including the first shell and second shell being oppositely arranged, the first shell and the second shell
The distance between it is adjustable；
Electrode slice, including first electrode sheet and second electrode sheet, the first electrode sheet are contained in the first shell,
The side of the first electrode sheet has the first protrusion for stretching out in the first shell, and the second electrode sheet is contained in institute
It states in second shell, the side of the second electrode sheet has the second protrusion for stretching out in the second shell；
Septum clip, between the first shell and the second shell and for clamping battery diaphragm, in use,
The septum clip is clamped between the first electrode sheet and the second electrode sheet.
Further, the first shell offers the first accommodating cavity, and the second shell offers the second accommodating cavity, institute
It states the first accommodating cavity and second accommodating cavity is located at the first shell and the opposite side of second shell.
Further, the septum clip includes first clamping piece and the second intermediate plate that is flexibly connected with the first clamping piece,
The first clamping piece is identical as the second intermediate plate size and the two can be clamped and be unclamped, the first clamping piece and second folder
The identical through-hole of size is offered at the same position of piece, in use, first clamping piece adaptation is contained in first accommodating
Chamber, the one side of the first clamping piece are close to the one side of the first electrode sheet, and the second intermediate plate adaptation is contained in institute
The second accommodating cavity is stated, the one side of the second intermediate plate is close to the one side of the second electrode sheet.
Further, the mating surface of the first shell and the second shell is respectively equipped with the first sealing ring, second close
Seal, in use, first sealing ring is mutually compressed with second sealing ring, so that first accommodating cavity and described
Confined space is formed between two accommodating cavities.
Further, four edges of the first shell and four edges of the second shell are equipped with respectively
Screw rod is connected between the first shell and the second shell by the screw rod, the first shell and the second shell
The distance between body realizes adjusting by rotating the screw rod.
Further, the first electrode sheet, second electrode sheet and the battery diaphragm for being clamped in the septum clip
Three is parallel to each other, and the center of three is on the same axis.
Another object of the present invention is to provide a kind of measurement method using above-mentioned battery diaphragm electrical property measuring device,
The following steps are included:
The first electrode sheet is installed in the first shell, the second electrode sheet is installed on the second shell
In body；
The septum clip is placed between the first shell and the second shell；
Electrolyte is injected into the first shell and second shell, and submerges certain time；
Obtain the blank resistance value R of electrolyte between the first electrode sheet and the second electrode sheet0；
The battery diaphragm of the single layer to match from diaphragm to be tested interception with septum clip；
The battery diaphragm of interception is installed on the septum clip, and infiltrates the battery diaphragm completely；
The distance between first protrusion and second protrusion are measured, and according to the thickness of the first electrode sheet
The thickness gauge of degree, the thickness of second electrode sheet and septum clip calculates the thickness of the battery diaphragm；
The resistance value R of the battery diaphragm is measured by AC impedence methodS；
Pass through formula:Calculate the ionic conductivity of the battery diaphragm, wherein σ be battery diaphragm from
Electron conductivity, R are battery diaphragm resistance value RSWith blank resistance value R0Difference, d be single layer battery diaphragm thickness, S be intercept
Battery diaphragm effective area corresponding with the electrode slice.
Further, the resistance value of duplicate measurements n times battery diaphragm, calculate n resistance value average value as battery every
Electric resistance value, wherein n is the integer greater than 1.
Further, Xiang Suoshu first shell and second shell are further comprising the steps of before injecting electrolyte: adjusting institute
The spacing between first electrode sheet and the second electrode sheet is stated, the septum clip is made to be clamped in the first electrode sheet and institute
It states between second electrode sheet.
Further, the resistance of the blank resistance value and the battery diaphragm is measured respectively using electrochemical workstation
Value.
Further, when measuring the resistance value of the blank resistance value and the battery diaphragm, by first protrusion,
Second protrusion is respectively electrically connected to the electrochemical workstation.
Beneficial effects of the present invention: battery diaphragm electrical property measuring device of the invention, due to battery diaphragm be clamped in every
On film fixture, septum clip is clamped between first electrode sheet and second electrode sheet, and battery diaphragm will not touch two always
The electrode slice of side, battery diaphragm not will receive the pressure in electrode slice or outside, be able to maintain characteristic inherently, improve different batches
The consistency of primary cell diaphragm measurement, meanwhile, first electrode sheet and second electrode sheet are respectively provided with the first protrusion, the second protrusion
Portion can facilitate the spacing between high precision measuring instrument measurement first electrode sheet and second electrode sheet, and then accurately calculate electricity
The thickness of pond diaphragm, simply, conveniently, test result accuracy is high for entire measurement process.
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 structural schematic diagram of battery diaphragm electrical property measuring device provided in an embodiment of the present invention；
Fig. 2 is the positive structure diagram of first electrode sheet；
Fig. 3 is the side structure schematic view of first electrode sheet；
Fig. 4 is the positive structure diagram of septum clip；
Fig. 5 is electrochemical impedance Linear Fit Chart；
Fig. 6 is the flow diagram of battery diaphragm electrical property measurement method provided in an embodiment of the present invention.
Wherein, each appended drawing reference in figure:
10-battery diaphragm electrical property measuring device 100-testing mould, 210-first shells
201-the first accommodating cavity 211-fluid hole, 220-second shell
202-the second accommodating cavity 221-liquid injection hole, 230-screw rod
310-first electrode sheet 320-second electrode sheets of the 311-the first protrusion
321-the second protrusion 400-septum clip, 410-first clamping piece
420-second intermediate plate 401-through-hole, 500-electrochemical workstations
600-battery diaphragms.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " length ", " width ", "upper", "lower", "front", "rear",
The orientation or positional relationship of the instructions such as "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside" is based on attached drawing institute
The orientation or positional relationship shown, is merely for convenience of description of the present invention and simplification of the description, rather than the dress of indication or suggestion meaning
It sets or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as to limit of the invention
System.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
As shown in figures 1-4, battery diaphragm electrical property measuring device 10 provided in an embodiment of the present invention, including testing mould
100, electrode slice and septum clip 400.Testing mould 100 has accommodating chamber 110, and testing mould is contained in accommodating chamber 110, surveys
Test die 100 includes spaced first shell 210 and second shell 220, and first shell 210 and second shell 220 it
Between distance it is adjustable.Electrode slice includes first electrode sheet 310 and second electrode sheet 320, and the section of the two can be in rectangle, and first
Electrode slice 310 is contained in first shell 210, and second electrode sheet 320 is contained in second shell 220, first electrode sheet 310
Side has the first protrusion 311 for stretching out in first shell 210, and the side of second electrode sheet 320, which has, stretches out in second shell
Second protrusion 321 of body 220, the first protrusion 311 and the second protrusion 321 with resistivity measurement device for connecting.Every
Film fixture 400 is for clamping battery diaphragm 600 and positioned at first shell 210 and second shell 220 between, it is clamped electric when use
Pond diaphragm 600, septum clip 400 are clamped between first electrode sheet 310 and second electrode sheet 320.First protrusion, 311 He
Second protrusion 321 is stretched out in the same side of testing mould 100, to be convenient for measuring the first protrusion 311 and the second protrusion 321
The distance between, and then the thickness of battery diaphragm 600 can be calculated.
Battery diaphragm electrical property measuring device 10 provided in this embodiment, since battery diaphragm 600 is held on septum clip
400, septum clip 400 is clamped between first electrode sheet 310 and second electrode sheet 320, and battery diaphragm 600 will not touch always
Encounter the electrode slice of two sides, battery diaphragm 600 not will receive the pressure in electrode slice or outside, it is able to maintain characteristic inherently,
The consistency of different batches battery diaphragm measurement is improved, meanwhile, first electrode sheet 310 and second electrode sheet 320 are respectively provided with the
One protrusion 311, the second protrusion 321 can facilitate high precision measuring instrument measurement first electrode sheet 311 and second electrode sheet
Spacing between 321, and then accurately calculate the thickness of battery diaphragm 600, entire measurement process is simple, conveniently, test result
Accuracy is high.
In one embodiment, first shell 210 offers the first accommodating cavity 201, and second shell 220 offers the second accommodating
Chamber 202, two accommodating cavities are located at the opposite side of two housings, when test, the first accommodating cavity 201 adaptation accommodating septum clip 400
Side, the other side of the second accommodating cavity 202 adaptation accommodating septum clip 400.
Septum clip 400 includes first clamping piece 410 and second intermediate plate 420, and two intermediate plates are flexibly connected, and the two can clamp and pine
It opens.Two pole piece size profiles are identical, and the same position of two intermediate plates offers the identical through-hole 401 of size respectively, when test, first
The adaptation receiving of intermediate plate 410 is stated in the first accommodating cavity 201, and the one side of first clamping piece 410 and the one side of first electrode sheet 310 are tight
Patch, the adaptation of second intermediate plate 420 are contained in the second accommodating cavity 202, the one side of second intermediate plate 420 and the one of second electrode sheet 320
Side is close to, in this way, forming closed chamber between septum clip 400 and two pole pieces.
In one embodiment, battery diaphragm electrical property measuring device further includes electrochemical workstation 500, when test, the electricity
The positive and negative anodes of chem workstation 500 stretch out in the first of testing mould 100 with first electrode sheet 310, second electrode sheet 320 respectively
Protrusion 311, the second protrusion 321 are electrically connected, easy to operate to test the resistance value of battery diaphragm, and measurement is accurate.
In one embodiment, the mating surface of first shell 210 and second shell 220 is respectively equipped with the first sealing ring, second
Sealing ring (not shown), in use, the first sealing ring is mutually compressed with the second sealing ring, so that the first accommodating cavity 201 and second
Confined space is formed between accommodating cavity 202.First sealing ring, the second sealing ring can be ring type seal, first shell 210
When spacing between second shell 220 is adjusted to the first sealing ring of two sides, the second sealing ring mutually compresses, sealing knot is formed
Structure.
In a specific embodiment, the rectangular in cross-section of septum clip 400, two intermediate plate rectangles of septum clip 400, two
The central corresponding position of rectangle intermediate plate offers rectangular opening, and clamped battery diaphragm 600 is also in rectangle, and septum clip 400 presss from both sides
The edge of tight battery diaphragm 600, first electrode sheet 310, second electrode sheet 320 and 600 three of battery diaphragm are mutually flat
Row, and the center of three is on the same axis, battery diaphragm 600 exposes to area (the i.e. face of rectangular opening of septum clip 400
Product) it is less than the area of first electrode sheet 310.
As shown in Figures 1 to 3, in one embodiment, the first protrusion 311 is located at the central position of 310 top surface of first electrode sheet
It sets, the second protrusion 321 is located at the central location of 320 top surface of second electrode sheet.First protrusion 311 and the second protrusion 321
The two is parallel, and distance between the two can be used the high precision measuring instruments such as micrometer and measure, due to the thickness of two electrode slices
Degree, septum clip itself with a thickness of known, therefore the first protrusion 311 and the second protrusion 321 that can be obtained according to measurement
The distance between the exact thickness of battery diaphragm 600 is calculated, and then can obtain battery diaphragm resistivity accurate measurement knot
Fruit.
In one embodiment, the first protrusion 311 is in rectangle, and the second protrusion 321 is also in rectangle.To battery diaphragm
When 600 measurement, the first protrusion 311 is stretched out from 210 top surface of first shell, and the second protrusion 321 is stretched from 220 top surface of second shell
Out, the positive and negative anodes of resistivity measurement device can be connect with the first protrusion 311, the second protrusion 321 respectively by conducting wire.
In one embodiment, first shell 210 and the opposite side of second shell 220 be recessed with respectively the first groove 211,
The accommodating space that size adapts to septum clip 400 is collectively formed in second groove 221, the first groove 211 and the second groove 221,
Septum clip 400 is contained in the accommodating space, and the length of the first groove 211 is equal to the length of the second groove 221 and adapts to
The length of septum clip 400, the width of the first groove 211 are equal to the width of the second groove 221 and adapt to septum clip 400
Width, so that electrolyte can infiltrate first electrode sheet 310, second electrode sheet 320；First shell 210 and second shell 220 are opposite
Side be respectively arranged with the first sealing ring 213, the second sealing ring 223, the first sealing ring 213, the second sealing ring 223 are ring
Shape sealing ring, the spacing between first shell 210 and second shell 220 are adjusted to the first sealing ring 213, second sealing of two sides
When circle 223 mutually compresses, the accommodating space formed between the first groove 211 and the second groove 221 can be sealed.
As shown in Figures 1 to 3, in one embodiment, conducting hose is connected between first shell 210 and second shell 220
(not shown), the top surface of second shell 220 offer liquid injection hole 222, can be by the liquid injection hole 222 to first shell 210 and
Electrolyte is injected in two shells 220, first shell 210 offers fluid hole 212 far from the side of second shell 220.Second shell
Body 220 is movable at liquid injection hole 222 to be provided with sealing cover, and rotatable sealing lid is to second shell when electrolyte is completed to inject
220 sealings；100 top surface of testing mould has mobilizable lid (not shown).When the electrolyte in first shell 210 soaks completely
When not having the top of first electrode sheet 310, electrolyte flows into remaining inner space of testing mould 100 from first shell 210, directly
The battery diaphragm 600 for being clamped in septum clip 400 is totally submerged to electrolyte, can stop injecting electrolyte at this time, then turn
Dynamic lid is with sealing test mold 100, be electrically capable of measuring to battery diaphragm 600.
As shown in Figure 1, in one embodiment, four edges of first shell 210 and four corners of second shell 220
Place is equipped with screw rod 230 respectively, is connected between first shell 210 and second shell 220 by screw rod 230, first shell 210 with
The distance between second shell 220 is realized by rotation screw rod 230 and is adjusted.That is, needing to change 310 He of first electrode sheet
When the distance between second electrode sheet 320, it can be realized by rotation screw rod 230.In one embodiment, every screw rod 230
Outer surface be provided with the first external screw thread and the second external screw thread, the first external screw thread and the second external screw thread are located at screw rod 230
Both ends, the first external screw thread and the second externally threaded hand of spiral on the contrary, in this way, when rotation screw rod 230 can drive first shell
210 and second shell 220 move toward one another or be away from each other movement, and then between changing between first shell 210 and second shell 220
Away from reducing the spacing between first shell 210 and second shell 220 and be located in preset range.
600 electrical property measurement method of battery diaphragm provided in an embodiment of the present invention, utilizes the battery diaphragm of above-described embodiment
Electrical property measuring device 10 measures, and can be used for measuring the resistance value and ionic conductivity of battery diaphragm 600, such as the institute of Fig. 1~6
Show, battery diaphragm electrical property measurement method the following steps are included:
Step S10: first electrode sheet 310 is mounted in first shell 210, second electrode sheet 320 is installed solid
Due in second shell 220.
Step S11: septum clip 400 is placed between first shell 210 and second shell 220.
Step S13: electrolyte is injected into first shell 210 and second shell 220, and submerges certain time.
Step S14: the blank resistance value R of electrolyte between first electrode sheet 310 and second electrode sheet 320 is obtained0。
Step S15: the battery diaphragm 600 of the single layer to match from diaphragm to be tested interception with septum clip.
Step S16: being installed on septum clip 400 for the battery diaphragm 600 of interception, and keeps battery diaphragm 600 completely immersed
Profit.
Step S17: measurement the distance between the first protrusion 311 and the second protrusion 321, and according to first electrode sheet
The thickness gauge of 310 thickness, the thickness of second electrode sheet 320 and septum clip 400 calculates the thickness of battery diaphragm 600.
Step S18: the resistance value R of battery diaphragm is measured by AC impedence methodS。
Step S20: pass through formula:The ionic conductivity of battery diaphragm is calculated, wherein σ is battery diaphragm
Ionic conductivity, R be battery diaphragm resistance value RSWith blank resistance value R0Difference, d be single layer battery diaphragm thickness, S be cut
The battery diaphragm taken effective area corresponding with electrode slice, i.e., when via area is greater than electrode slice area, which is
Electrode slice area；When via area is less than electrode slice area, which is via area.
In step slo, two electrode slices can be fixed on respectively first shell 210 and second shell by glue
In 220 the first accommodating cavity, the second accommodating cavity.
Smooth stainless steel, copper sheet, aluminium flake grade high conductive gold can be used in first electrode sheet 310 and second electrode sheet 320
Belong to sheet material, sheet thickness range is in 1mm~10mm.The organic polymer of electrolyte resistance, such as polytetrafluoro can be used in testing mould 100
Inorganic, such as quartz can also be used in ethylene.The raw material of each component of measuring device 10 are cheap and readily available, greatly convenient
Measurement.
Further include step S12 between step S11 and step S13: adjusting first electrode sheet 310 and second electrode sheet 320
Between spacing, make septum clip 400 clamp and first electrode sheet 310 and second electrode sheet 320 between.When operation, it can pass through
Rotate adjusting of the realization of screw rod 230 being bolted on testing mould 100 to two electrode slice spacing.
The corrosion resistant polymer material of electrolyte resistance, such as polytetrafluoroethylene (PTFE), polyethylene can be used in septum clip 400.
In step s 13, the electrolyte of injection can be made of lithium hexafluoro phosphate and mixed solvent, the concentration of lithium hexafluoro phosphate
For 1mol/L, mixed solvent includes following components: ethylene carbonate, methyl ethyl carbonate and dimethyl carbonate, and ethylene carbonate,
The volume ratio of methyl ethyl carbonate and dimethyl carbonate is 1:1:1.Ethylene carbonate, methyl ethyl carbonate and dimethyl carbonate are electricity
Pond grade reagent, main content are all larger than 99.95%, and moisture is less than 0.001%.
In step S14, the blank resistance value that electrochemical workstation 500 tests electrolyte can be used.It, will be electrochemical when operation
Learn work station 500 positive and negative anodes respectively with the first protrusion 311 of first electrode sheet 310, second electrode sheet 320 second protrusion
Portion 321 connects.
In step S15, its sectional area of single layer battery diaphragm 600 intercepted from diaphragm to be tested is slightly larger than septum clip
The area of 400 rectangular opening, the i.e. length of battery diaphragm 600 are greater than the length of rectangular opening, and the width of battery diaphragm 600 is greater than electricity
The width of pond diaphragm 600.Battery diaphragm 600, first electrode sheet 310 and second electrode sheet 320 are all totally submerged in electrolyte
In, battery diaphragm 600 is between first electrode sheet 310 and second electrode sheet 320, also, battery diaphragm 600 is respectively with first
Electrode slice 310 is parallel with second electrode sheet 320.That is, electricity when the battery diaphragm 600 of interception is clamped in septum clip 400
Pond diaphragm 600 keeps smooth, corrugationless, will not be touched during the test by the electrode slice of two sides.
In step s 16, the time that two electrode slices submerge in the electrolytic solution may be configured as 2 hours or be higher than 2 hours, will press from both sides
The septum clip 400 for holding battery diaphragm 600 is put into and is clamped between two electrode slices, until battery diaphragm 600 is completely immersed
Profit.Using the septum clip 400 of rectangle, it is ensured that battery diaphragm 600 is not by pressure, in the electrolytic solution, the table of battery diaphragm 600
Face is smooth and sufficiently infiltrates, and can improve the accuracy and authenticity of measurement.
In step S17, the spacing between the first protrusion 311 and the second protrusion 321 is measured, according to the spacing measured
The thickness of single layer battery diaphragm 600 is calculated, and then calculates the ionic conductivity of battery diaphragm 600.First electrode sheet 310 with
Spacing between second electrode sheet 320 can be used the high-resolutions instrument such as micrometer and measure, and it is convex to measure first with micrometer
Spacing between portion 311 and the second protrusion 321 out.In one embodiment, the first protrusion 311, the second protrusion 321 divide
Not Wei Yu first electrode sheet 310 and second electrode sheet 320 central location, and the thickness of first electrode sheet 310, second electrode sheet
320 thickness and septum clip with a thickness of known, therefore can rapidly calculate the battery being clamped on septum clip 400
The thickness of diaphragm, in this way, can be by the spacing between the first protrusion 311 of measurement and the second protrusion 321 come for conductivity
Accurate calculate provides convenient, and entire test process is simple, conveniently, and repeatability is high.
In step S18, the working frequency of electrochemical workstation 500 can be arranged 1~106To battery within the scope of HZ
Diaphragm carries out electrical impedance test, then carries out linear fit by test data and obtain resistance value.Made using electrochemical workstation 500
High-frequency ac inner walkway is carried out for auxiliary, the a-c cycle of use is tested up to million ranks, can be effectively reduced in polarization
The influence to test result is hindered, the test result than directlying adopt resistance instrument is more accurate.
In step S20, it is calculated by the following formula the ionic conductivity of battery diaphragm 600:
Wherein, σ is the ionic conductivity of battery diaphragm, and d is the thickness of single layer battery diaphragm, and S is outside the battery diaphragm 600 of interception
It is exposed to the area of the side of septum clip 400, R is battery diaphragm resistance value RSWith blank resistance value R0Difference, R can be by following public affairs
Formula calculates:
Wherein, 600 resistance value of battery diaphragm is the average value of n resistance value, R0For the blank control group for not putting battery diaphragm 600
Obtained blank resistance value is measured, in this way, the ionic conductivity that battery diaphragm 600 can be improved is surveyed by setting blank control group
The accuracy of amount reduces 10 bring contact resistance of measuring device or systematic error.
It in one embodiment, further include step S19 between step S18 and step S20: duplicate measurements n times battery diaphragm
600 resistance value calculates the average value of n resistance value as 600 resistance value of battery diaphragm, calculates the conductance of battery diaphragm 600
Rate, n are integer.The accuracy of measurement can be improved in the multiple resistance value of retest.Battery diaphragm 600 only edge by the diaphragm of rectangle
Fixture 400 clamps, and battery diaphragm 600 not will receive the pressure in two sides electrode slice or outside, and it is solid that battery diaphragm 600 is able to maintain itself
Some characteristics eliminate the different degrees of damage to different battery diaphragms, increase the battery diaphragm resistivity of different batches
The consistency of measurement.
As shown in figure 5, using electrochemical workstation 1~106Electrical impedance is carried out to battery modules in the frequency range of HZ
Test, measures multiple groups resistance value, obtains the average value of n resistance value by carrying out linear fit to test data, then substitutes into
R is calculated in formula (2), then obtained R is substituted into formula (1), to calculate the ionic conductivity σ of battery diaphragm 600.
Following table is using battery diaphragm electrical property measurement method provided by the embodiments of the present application to three kinds of different sizes and class
The data that the battery diaphragm of type measures:
Test 1 tests 2 polyethylene that 2um ceramic layer is coated with using surface, test 3 using the polypropylene of 20um thickness
Using composite diaphragm, two polypropylene are sandwiched between polyethylene, and the polyacrylic outer surface of two sides is coated with ceramic layer.For
The battery diaphragm 600 of different-thickness, type can be obtained using battery diaphragm electrical property measurement method provided by the embodiments of the present application
Accurate and effective measurement result.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (11)
1. a kind of battery diaphragm electrical property measuring device, it is characterised in that: include:
Testing mould, including the first shell and second shell being oppositely arranged, between the first shell and the second shell
Distance it is adjustable；
Electrode slice, including first electrode sheet and second electrode sheet, the first electrode sheet is contained in the first shell, described
The side of first electrode sheet, which has, stretches out in the first protrusion of the first shell, and the second electrode sheet is contained in described the
In two shells, the side of the second electrode sheet has the second protrusion for stretching out in the second shell；
Septum clip, between the first shell and the second shell and for clamping battery diaphragm, in use, described
Septum clip is clamped between the first electrode sheet and the second electrode sheet.
2. battery diaphragm electrical property measuring device according to claim 1, it is characterised in that: the first shell offers
First accommodating cavity, the second shell offer the second accommodating cavity, and first accommodating cavity and second accommodating cavity are located at institute
State first shell and the opposite side of second shell.
3. battery diaphragm electrical property measuring device according to claim 2, it is characterised in that: the septum clip includes the
One intermediate plate and the second intermediate plate being flexibly connected with the first clamping piece, the first clamping piece it is identical as the second intermediate plate size and
The two can be clamped and be unclamped, and the identical through-hole of size is offered at the same position of the first clamping piece and the second intermediate plate,
In use, the first clamping piece adaptation is contained in first accommodating cavity, the one side of the first clamping piece and first electricity
The one side of pole piece is close to, and the second intermediate plate adaptation is contained in second accommodating cavity, the one side of the second intermediate plate with
The one side of the second electrode sheet is close to.
4. battery diaphragm electrical property measuring device according to claim 3, it is characterised in that: the first shell and described
The mating surface of second shell is respectively equipped with the first sealing ring, the second sealing ring, in use, first sealing ring and described second
Sealing ring mutually compresses, so as to form confined space between first accommodating cavity and second accommodating cavity.
5. battery diaphragm electrical property measuring device according to claim 1, it is characterised in that: four of the first shell
Edge and four edges of the second shell are equipped with screw rod respectively, between the first shell and the second shell
It is connected by the screw rod, the distance between the first shell and the second shell realize tune by rotating the screw rod
Section.
6. battery diaphragm electrical property measuring device according to claim 1, it is characterised in that: the first electrode sheet,
Two electrode slices and the battery diaphragm three for being clamped in the septum clip are parallel to each other, and the center of three is in same axis
On.
7. a kind of measurement method using any one of the claim 1~6 battery diaphragm electrical property measuring device, feature exist
In: the following steps are included:
The first electrode sheet is installed in the first shell, the second electrode sheet is installed on the second shell
In；
The septum clip is placed between the first shell and the second shell；
Electrolyte is injected into the first shell and second shell, and submerges certain time；
Obtain the blank resistance value R of electrolyte between the first electrode sheet and the second electrode sheet0；
The battery diaphragm of the single layer to match from diaphragm to be tested interception with septum clip；
The battery diaphragm of interception is installed on the septum clip, and infiltrates the battery diaphragm completely；
Measure the distance between first protrusion and second protrusion, and according to the thickness of the first electrode sheet,
The thickness of second electrode sheet and the thickness gauge of septum clip calculate the thickness of the battery diaphragm；
The resistance value R of the battery diaphragm is measured by AC impedence methodS；
Pass through formula:The ionic conductivity of the battery diaphragm is calculated, wherein σ is the ion-conductance of battery diaphragm
Conductance, R are battery diaphragm resistance value RSWith blank resistance value R0Difference, d be single layer battery diaphragm thickness, S be intercept battery
Diaphragm effective area corresponding with the electrode slice.
8. battery diaphragm electrical property measurement method according to claim 7, it is characterised in that: duplicate measurements n times battery every
The resistance value of film calculates the average value of n resistance value as battery diaphragm resistance value, wherein n is the integer greater than 1.
9. battery diaphragm electrical property measurement method according to claim 7, it is characterised in that: Xiang Suoshu first shell and
Two shells are further comprising the steps of before injecting electrolyte: between adjusting between the first electrode sheet and the second electrode sheet
Away from being clamped in the septum clip between the first electrode sheet and the second electrode sheet.
10. battery diaphragm electrical property measurement method according to claim 7, it is characterised in that: use electrochemical workstation
The resistance value of the blank resistance value and the battery diaphragm is measured respectively.
11. battery diaphragm electrical property measurement method according to claim 10, it is characterised in that: measure the blank resistance
When value and the resistance value of the battery diaphragm, first protrusion, the second protrusion are respectively electrically connected to the electrochemistry
Work station.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811642534.9A CN109596995A (en) | 2018-12-29 | 2018-12-29 | Battery diaphragm electrical property measuring device and measuring method |
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|---|---|---|---|
| CN201811642534.9A CN109596995A (en) | 2018-12-29 | 2018-12-29 | Battery diaphragm electrical property measuring device and measuring method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111157580A (en) * | 2020-01-10 | 2020-05-15 | 青岛兴仪电子设备有限责任公司 | High-temperature material electromagnetic parameter measurement system and method based on fixture de-embedding |
| CN113433389A (en) * | 2021-06-24 | 2021-09-24 | 东莞维科电池有限公司 | Method and device for testing ionic conductivity of diaphragm |
-
2018
- 2018-12-29 CN CN201811642534.9A patent/CN109596995A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111157580A (en) * | 2020-01-10 | 2020-05-15 | 青岛兴仪电子设备有限责任公司 | High-temperature material electromagnetic parameter measurement system and method based on fixture de-embedding |
| CN113433389A (en) * | 2021-06-24 | 2021-09-24 | 东莞维科电池有限公司 | Method and device for testing ionic conductivity of diaphragm |
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