CN111579871A - Device and method for testing ionic conductivity of battery diaphragm - Google Patents
Device and method for testing ionic conductivity of battery diaphragm Download PDFInfo
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- CN111579871A CN111579871A CN202010377449.5A CN202010377449A CN111579871A CN 111579871 A CN111579871 A CN 111579871A CN 202010377449 A CN202010377449 A CN 202010377449A CN 111579871 A CN111579871 A CN 111579871A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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Abstract
The invention discloses a device and a method for testing ionic conductivity of a battery diaphragm, which comprises the following steps: a housing provided with a mounting hole; the clamping structure is detachably arranged in the shell and comprises a first clamping part and a second clamping part, a first through hole and a second through hole are respectively formed in the first clamping part and the second clamping part, and a diaphragm placing gap is formed between the first clamping part and the second clamping part; the first electrode is arranged on one side of the shell in a manner of moving left and right, is connected with the outer side wall of the clamping structure and forms a groove with the first through hole; the second electrode is arranged on the other side of the shell in a manner of moving left and right, is connected with the outer side wall of the clamping structure and forms a groove with the second through hole; a heating structure disposed on the first electrode and the second electrode; and the temperature measuring structure is arranged in the groove formed by the second electrode and the second through hole. The invention can test the conductivity of the battery diaphragm in different temperatures of the battery environment.
Description
Technical Field
The invention relates to the technical field of battery diaphragm performance testing, in particular to a battery diaphragm ionic conductivity testing device and a testing method.
Background
The lithium battery mainly comprises an anode, a cathode, electrolyte and a diaphragm, wherein the diaphragm is positioned between the anode and the cathode and is used for separating the anode and the cathode to prevent electrons from passing through but allow ions to pass through, when the internal temperature of the battery rises, the diaphragm of the battery can close micropores to prevent lithium ions from passing through, the connection between the anode and the cathode is cut off, the reaction of the battery is stopped, the safety of the battery is improved, and therefore the performance of the diaphragm of the lithium battery plays a crucial role in the safety of the battery.
The ionic conductivity of the diaphragm directly determines the conduction condition of lithium ions in the diaphragm when the lithium battery works, and the conduction condition is closely related to the internal resistance of the battery, while the internal resistance of the lithium battery greatly affects the performances of other aspects of the battery, such as rate performance, cycle performance, capacity attenuation and the like, the performances directly determine the quality of the battery, and currently, each mainstream diaphragm manufacturer only has a method and a device for testing the ionic conductivity at normal temperature, but actually, the working environment of the battery is not the normal temperature environment due to the heat release of the battery in the working process.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a device for testing the ionic conductivity of a battery diaphragm, which can test the conductivity of the battery diaphragm in different temperatures of a battery environment.
The embodiment of the invention provides a device for testing the ionic conductivity of a battery diaphragm, which comprises:
a housing provided with a mounting hole;
the clamping structure is detachably arranged in the shell through the mounting hole of the shell and comprises a first clamping part and a second clamping part, a first through hole and a second through hole are respectively formed in the first clamping part and the second clamping part, and a diaphragm placing gap is formed between the first clamping part and the second clamping part;
the first electrode is arranged on one side of the shell in a left-right moving mode, and when the first electrode moves to one side attached to the first clamping portion, a groove is formed between the first electrode and the first through hole;
the second electrode is arranged on the other side of the shell in a manner of moving left and right, and forms a groove together with the second through hole when moving to one side attached to the second clamping part;
a heating structure;
the temperature measuring structure is arranged on one side, close to the first through hole, of the first electrode and can be inserted into the first through hole; or the second electrode is arranged on one side of the second electrode close to the second through hole and can be inserted into the second through hole.
The device for testing the ionic conductivity of the battery diaphragm provided by the embodiment of the invention at least has the following beneficial effects: electrolyte is injected into the shell through the liquid injection hole, the first electrodes and the second electrodes on two sides are moved to the first through holes and the second through holes which are formed in the clamping structure, the electrodes are in contact connection with the inner wall of the shell, and the clamping structure is set to have a certain thickness, so that grooves can be formed between the electrodes and the through holes. The battery diaphragm is inserted into the diaphragm placing gap, the battery diaphragm can cover the through hole, and the grooves on two sides of the battery diaphragm are divided into two closed solution spaces by the battery diaphragm at the moment, so that the internal environment of the battery is simulated. The heating structure heats the electrodes, so that the environment of the battery during heating is simulated, the temperature near the diaphragm is measured in real time through the temperature measuring structure, and the impedance measured by the external electrochemical workstation is combined, so that the conductivity of the battery diaphragm at different temperatures is tested. Because the test is carried out in a way of simulating the internal environment of the battery, the obtained conductivity value is closer to the value of the battery diaphragm in actual operation, and the test result has higher reference value. And the clamping structure is arranged in a detachable manner, so that the clamping structure can be directly extracted from the shell, and the clamping structure with a new diaphragm to be tested is directly replaced, thereby improving the testing efficiency of the conductivity of the diaphragm.
According to some embodiments of the invention, the first electrode includes a first fixing portion disposed at an outer side of the case and a first extending portion extending into the case through a sidewall of the case.
According to some embodiments of the invention, the first extending portion includes a first connecting portion and a first protruding portion, the cross-sectional area of the first connecting portion is larger than that of the first through hole, and when the first connecting portion is attached to the outer side wall of the clamping structure, the first protruding portion is embedded in a groove formed by the first connecting portion and the first through hole.
According to some embodiments of the invention, the second electrode is identical in structure to the first electrode and symmetrically arranged.
According to some embodiments of the invention, the clamping structure is a split structure or is integrally formed.
According to some embodiments of the invention, the heating structure is a resistance wire, one end of the resistance wire is arranged on the first electrode and the second electrode, and the other end of the resistance wire is connected with the heater.
According to some embodiments of the invention, the temperature measuring structure is a thermocouple.
According to some embodiments of the invention, the housing, the outer layer of the first electrode, the outer layer of the second electrode, and the outer layer of the temperature measurement structure are made of any one of polytetrafluoroethylene, polyphenylene sulfide, polyvinylidene fluoride, polypropylene, polyethylene, and polycarbonate.
According to some embodiments of the invention, the clamping plate structure further comprises a liquid inlet and a liquid outlet, wherein the liquid inlet and the liquid outlet are arranged on the upper part of the shell and are arranged on two sides of the clamping plate structure.
The embodiment of the second aspect of the invention provides a method for testing the ionic conductivity of a battery diaphragm, which is applied to the device for testing the ionic conductivity of the battery diaphragm, and comprises the following steps:
injecting electrolyte into the shell;
inserting the gripping structure with the septum into the housing;
heating the first electrode and the second electrode, measuring the temperature near the diaphragm in real time, and measuring the impedance value between the two electrodes at different temperatures T;
respectively measuring resistance values R1, R2 and Rn of 1 layer of the diaphragm, 2 layers of the diaphragm and n layers of the diaphragm;
and obtaining the ionic conductivity of the diaphragm through the average impedance value of the diaphragm, the thickness value of the diaphragm and the effective area value of the electrode in different layers.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of an apparatus for testing ionic conductivity of a battery separator according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the battery separator ionic conductivity testing apparatus shown in FIG. 1 before operation;
FIG. 3 is a flow chart of a method for testing ionic conductivity of a battery separator according to an embodiment of the invention.
Reference numerals:
a first electrode 100, a first fixing portion 110, a first extending portion 120, a first connecting portion 121, a first protrusion 122,
A second electrode 200, a second fixing portion 210, a second extending portion 220, a second connecting portion 221, a second protrusion 222,
A heating structure 300,
A temperature measuring structure 400,
A septum 500,
A shell 600, a liquid injection hole 610, a liquid outlet hole 620,
The clamping structure 700, the first clamping portion 710, the second clamping portion 720, the first through hole 730, and the second through hole 740.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If it is stated that the second and the second are only used for distinguishing technical features, the description is not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the precedence of the indicated technical features.
Referring to fig. 1 and 2, a first aspect of the present invention provides a battery separator ionic conductivity testing apparatus comprising: a case 600 provided with a mounting hole; the clamping structure 700 is detachably mounted in the housing 600 through a mounting hole of the housing 600, the clamping structure 700 comprises a first clamping part 710 and a second clamping part 720, a first through hole 730 and a second through hole 740 are respectively arranged on the first clamping part 710 and the second clamping part 720, and a diaphragm placing gap is formed between the first clamping part 710 and the second clamping part 720; the first electrode 100 is arranged on one side of the shell 600 in a manner that the first electrode 100 can move left and right, and when the part of the first electrode 100 moves to the first through hole 730, the first electrode 100 is connected with the outer side wall of the clamping structure 700 and forms a groove with the first through hole 730; the second electrode 200 is arranged on the other side of the shell 600 in a manner that the second electrode 200 can move left and right, and when part of the second electrode 200 moves to the second through hole 740, the second electrode 200 is connected with the outer side wall of the clamping structure 700 and forms a groove with the second through hole 740; a heating structure 300 disposed on the first electrode 100 and the second electrode 200; the temperature measuring structure 400 is disposed in a groove formed by the first electrode 100 and the first via 730, or disposed in a groove formed by the second electrode 200 and the second via 740.
Specifically, the first through hole 730 and the second through hole 740 are respectively disposed at the middle portions of the first clamping portion 710 and the second clamping portion 720, and the first through hole 730 and the second through hole 740 are oppositely disposed. The clamping structure 700 is a split structure or is integrally formed, and when the clamping structure is a split structure, the first clamping part 710 and the second clamping part 720 are separately manufactured and fixed together through a fixing part; when the two parts are integrally formed, the lower part is of an integral structure.
Electrolyte is injected into the casing 600 through the electrolyte injection hole 610, the first electrode 100 and the second electrode 200 on both sides are moved to the first through hole 730 and the second through hole 740 formed in the clamping structure 700, the electrodes are in contact connection with the inner wall of the casing 600, and since the clamping structure 700 is set to have a certain thickness, a groove can be formed between the electrodes and the through holes. The battery separator 500 is inserted into the separator placing gap, and the battery separator 500 may cover the first through-hole 730 and the second through-hole 740, and at this time, the groove of both sides is divided into two closed solution spaces by the battery separator 500, thereby simulating the internal environment of the battery. The heating structure 300 heats the electrodes, so that the environment of the battery during heating is simulated, the temperature near the diaphragm 500 is measured in real time through the temperature measuring structure 400, and the impedance measured by an external electrochemical workstation is combined, so that the conductivity of the battery diaphragm 500 at different temperatures is tested. Because the test is carried out in a way of simulating the internal environment of the battery, the obtained conductivity value is closer to the value of the battery separator 500 in actual operation, and the test result has more reference value. And the clamping structure 700 is arranged in a detachable manner, so that the clamping structure 700 can be directly extracted from the casing 600 and replaced with the clamping structure 700 with a new diaphragm 500 to be tested, and the testing efficiency of the conductivity of the diaphragm 500 can be improved.
In some embodiments of the present invention, the first electrode 100 includes a first fixing portion 110 and a first extending portion 120, the first fixing portion 110 is disposed outside the casing 600, and the first extending portion 120 extends into the casing 600 through a sidewall of the casing 600. The first extension part 120 includes a first connection part 121 and a first protrusion part 122, the cross-sectional area of the first connection part 121 is greater than that of the first through hole 730, and when the first connection part 121 is connected to the outer sidewall of the clamping structure 700, the first protrusion part 122 is embedded in the groove formed by the first connection part 121 and the first through hole 730. The second electrode 200 includes a second fixing portion 210 and a second extending portion 220, the second fixing portion 210 is disposed at an outer side of the case 600, and the second extending portion 220 extends into the case 600 through a sidewall of the case 600. The second extension part 220 includes a second connection part 221 and a second protrusion 222, the cross-sectional area of the second connection part 221 is larger than that of the second through hole 740, and when the second connection part 221 is connected to the outer sidewall of the clamping structure 700, the second protrusion 222 is inserted into the groove formed by the second connection part 221 and the second through hole 740.
The first electrode 100 comprises a fixed part arranged outside the casing 600 and an extending part arranged inside the casing 600, so that the distance of the extending part of the first electrode 100 moving in the casing 600 can be adjusted by external power, and the adjustment of the first electrode 100 is facilitated. The cross-sectional area of the first connection part 121 is larger than that of the first through hole 730, so that the first through hole 730 is sealed, and a sealed space is formed between the first connection part 121, the first through hole 730 and the diaphragm 500. The first protrusion 122 is embedded into the groove formed by the first connection portion 121 and the first through hole 730, and the shape of the first protrusion 122 and the shape of the first through hole 730 can be set to just fit with each other, so that the situation that the first electrode 100 may shake when being connected to the sidewall where the first through hole 730 is located can be avoided, and the connection between the first electrode 100 and the first through hole 730 is more stable. The shape of the second electrode 200, and the positional relationship with the casing 600, are similar to the shape of the first electrode 100, and the positional relationship with the casing 600.
In some embodiments of the present invention, the heating structure 300 is a resistance wire, one end of which is disposed on the first electrode 100 and the second electrode 200, and the other end of which is connected to the heater. The temperature measuring structure 400 is a thermocouple, one end of which is disposed in a groove formed by the first electrode 100 and the first through hole 730 or in a groove formed by the second electrode 200 and the second through hole 740, and the other end of which is connected to a measuring device. The first case 600, the outer layer of the first electrode 100, the outer layer of the second electrode 200, and the outer layer of the temperature measuring structure 400 are made of one of polytetrafluoroethylene, polyphenylene sulfide, polyvinylidene fluoride, polypropylene, polyethylene, and polycarbonate. The liquid inlet 610 is provided at an upper portion of the case 600, and the liquid outlet 620 is provided at an upper portion of the case 600. In some embodiments, the heating structure 300 may also be a thermal oven, with the first electrode 100 and the second electrode 200 disposed within the thermal oven.
Using the resistance wire as the heating structure 300, a portion of the resistance wire may be penetrated inside the first electrode 100 and the second electrode 200, the resistance wire is heated by the heater, and then the heat is transferred to the electrodes, thereby transferring the heat to the electrolyte near the diaphragm 500, thereby increasing the temperature of the electrolyte, and thus simulating the environment of the battery in actual operation. The advantage of adopting the resistance wire heating lies in that, the resistance wire penetrates the whole part of electrode and can all play the effect of heating to promote the efficiency of heating. And a thermocouple is used as the temperature measuring structure 400, a thermocouple portion can be placed closer to the battery separator 500 through a wire, thereby more accurately measuring a temperature value near the battery separator 500. If a thermal oven is used as the heating structure 300, the first electrode 100 and the second electrode 200 are more uniformly heated because the first electrode 100 and the second electrode 200 are disposed in the thermal oven.
The first case 600, the outer layer of the first electrode 100, the outer layer of the second electrode 200, and the outer layer of the temperature measuring structure 400 are made of one of polytetrafluoroethylene, polyphenylene sulfide, polyvinylidene fluoride, polypropylene, polyethylene, and polycarbonate, and can perform an electrolyte corrosion resistance function. The liquid inlet 610 is disposed at an upper portion of the case 600, and the liquid outlet 620 is disposed at an upper portion of the case 600, so that the electrolyte can be better injected into the case 600 and the case 600, and can be better discharged from the case 600 than when the case is installed at another place.
Referring to fig. 3, in a second aspect of the embodiments of the present invention, there is provided a battery separator 500 ion conductivity test method including the steps of:
step S100: injecting electrolyte into the case 600 through the injection hole 610;
step S200: inserting the clamping structure 700 with septum 500 into housing 600;
step S300: heating the first electrode 100 or the second electrode 200, measuring the temperature near the diaphragm 500 in real time, and measuring the impedance value between the two electrodes at different temperatures T;
step S400: resistance values R1, R2, Rn of the 1-layer separator 500, the 2-layer separator 500 to the n-layer separator 500 were measured, respectively;
step S500: the ion conductivity of the membrane 500 is obtained by the average impedance value of the membranes 500 with different layers, the thickness value of the membrane 500 and the effective area value of the electrode.
Specifically, step 1: when the test is started, the liquid injection hole 610 is closed, the liquid outlet hole 620 is opened, the first electrode 100 moves rightwards, the second electrode 200 moves leftwards, and at the moment, the redundant electrolyte is discharged out of the device through the liquid outlet hole 620.
Step 2: after the first electrode 100 and the second electrode 200 are embedded in the separator 500, the heating mechanism and the temperature measuring mechanism 400 start to operate, and after the test temperature T is reached, the resistance value R is measured through an external electrochemical workstation.
And step 3: after the test is finished, the first electrode 100 moves leftwards, the second electrode 200 moves rightwards, and the electrolyte is discharged through the liquid outlet 620 due to the pressure.
And 4, step 4: repeating the steps 1 to 3 to respectively test the impedances R1, R2, R3 and R4 of the 1, 2, 3 and 4-layer diaphragms 500, and after linear fitting:
Y＝aX+b
where a is the average impedance of the diaphragm 500.
The ion conductivity of the separator 500 is σ ═ d/aS, d is the thickness of the separator 500, and S is the electrode effective area.
Electrolyte is injected into the casing 600 through the electrolyte injection hole 610, the first electrode 100 and the second electrode 200 on both sides are moved to the first through hole 730 and the second through hole 740 formed in the clamping structure 700, the electrodes are in contact connection with the inner wall of the casing 600, and since the clamping structure 700 is set to have a certain thickness, a groove can be formed between the electrodes and the through holes. The battery separator 500 is inserted into the separator 500 to be placed in the gap, the battery separator 500 may cover the through-hole, and at this time, the groove at both sides of the battery separator 500 is divided into two closed solution spaces, thereby simulating the internal environment of the battery. The heating structure 300 heats the electrodes, so that the environment of the battery during heating is simulated, the temperature near the diaphragm 500 is measured in real time through the temperature measuring structure 400, and the impedance measured by an external electrochemical workstation is combined, so that the conductivity of the battery diaphragm 500 at different temperatures is tested. Because the test is carried out in a way of simulating the internal environment of the battery, the obtained conductivity value is closer to the value of the battery separator 500 in actual operation, and the test result has more reference value. And the clamping structure 700 is arranged in a detachable manner, so that the clamping structure 700 can be directly extracted from the casing 600 and replaced with the clamping structure 700 with a new diaphragm 500 to be tested, and the testing efficiency of the conductivity of the diaphragm 500 can be improved.
The ion conductivity test apparatus for a battery separator according to an embodiment of the present invention will be described in detail in one specific embodiment with reference to fig. 1 to 3. It is to be understood that the following description is only exemplary, and not a specific limitation of the invention.
The first aspect of the present invention provides a battery separator ionic conductivity testing apparatus, comprising: a housing 600 having an upper portion provided with a mounting hole; a case 600 provided with a mounting hole; the clamping structure 700 is detachably mounted in the housing 600 through a mounting hole of the housing 600, the clamping structure 700 comprises a first clamping part 710 and a second clamping part 720, a first through hole 730 and a second through hole 740 are respectively arranged on the first clamping part 710 and the second clamping part 720, and a diaphragm placing gap is formed between the first clamping part 710 and the second clamping part 720; the first electrode 100 is arranged on one side of the shell 600 in a manner that the first electrode 100 can move left and right, and when the part of the first electrode 100 moves to the first through hole 730, the first electrode 100 is connected with the outer side wall of the clamping structure 700 and forms a groove with the first through hole 730; the second electrode 200 is arranged on the other side of the shell 600 in a manner that the second electrode 200 can move left and right, and when part of the second electrode 200 moves to the second through hole 740, the second electrode 200 is connected with the outer side wall of the clamping structure 700 and forms a groove with the second through hole 740; a heating structure 300 disposed on the first electrode 100 and the second electrode 200; the temperature measuring structure 400 is disposed in a groove formed by the first electrode 100 and the first via 730, or disposed in a groove formed by the second electrode 200 and the second via 740.
The first electrode 100 includes a first fixing portion 110 and a first extending portion 120, the first fixing portion 110 is disposed outside the casing 600, and the first extending portion 120 extends into the casing 600 through a sidewall of the casing 600. The first extension part 120 includes a first connection part 121 and a first protrusion part 122, the cross-sectional area of the first connection part 121 is greater than that of the first through hole 730, and when the first connection part 121 is connected to the outer sidewall of the clamping structure 700, the first protrusion part 122 is embedded in the groove formed by the first connection part 121 and the first through hole 730. The second electrode 200 includes a second fixing portion 210 and a second extending portion 220, the second fixing portion 210 is disposed at an outer side of the case 600, and the second extending portion 220 extends into the case 600 through a sidewall of the case 600. The second extension part 220 includes a second connection part 221 and a second protrusion 222, the cross-sectional area of the second connection part 221 is larger than that of the second through hole 740, and when the second connection part 221 is connected to the outer sidewall of the clamping structure 700, the second protrusion 222 is inserted into the groove formed by the second connection part 221 and the second through hole 740.
The heating structure 300 is a resistance wire, one end of the resistance wire is disposed on the first electrode 100 and the second electrode 200, and the other end is connected to the heater. The temperature measuring structure 400 is a thermocouple, one end of which is disposed in a groove formed by the first electrode 100 and the first through hole 730 or in a groove formed by the second electrode 200 and the second through hole 740, and the other end of which is connected to a measuring device. The case 600, the outer layer of the first electrode 100, the outer layer of the second electrode 200, and the outer layer of the temperature measuring structure 400 are made of one of polytetrafluoroethylene, polyphenylene sulfide, polyvinylidene fluoride, polypropylene, polyethylene, and polycarbonate. The liquid inlet 610 is provided at an upper portion of the case 600, and the liquid outlet 620 is provided at an upper portion of the case 600.
According to the device for testing the ionic conductivity of the battery separator, at least the following effects can be achieved by injecting the electrolyte into the shell 600 through the injection hole 610, moving the first electrode 100 and the second electrode 200 on two sides to the first through hole 730 and the second through hole 740 formed in the clamping structure 700, enabling the electrodes to be in contact connection with the inner wall of the shell 600, and forming a groove between the electrodes and the through holes due to the fact that the clamping structure 700 is arranged to have a certain thickness. The battery separator 500 is inserted into the separator 500 to be placed in the gap, the battery separator 500 may cover the through-hole, and at this time, the groove at both sides of the battery separator 500 is divided into two closed solution spaces, thereby simulating the internal environment of the battery. The heating structure 300 heats the electrodes, so that the environment of the battery during heating is simulated, the temperature near the diaphragm 500 is measured in real time through the temperature measuring structure 400, and the impedance measured by an external electrochemical workstation is combined, so that the conductivity of the battery diaphragm 500 at different temperatures is tested. Because the test is carried out in a way of simulating the internal environment of the battery, the obtained conductivity value is closer to the value of the battery separator 500 in actual operation, and the test result has more reference value. And the clamping structure 700 is arranged in a detachable manner, so that the clamping structure 700 can be directly extracted from the casing 600 and replaced with the clamping structure 700 with a new diaphragm 500 to be tested, and the testing efficiency of the conductivity of the diaphragm 500 can be improved.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. A battery separator ionic conductivity testing device, comprising:
a housing provided with a mounting hole;
the clamping structure is detachably arranged in the shell through the mounting hole of the shell and comprises a first clamping part and a second clamping part, a first through hole and a second through hole are respectively formed in the first clamping part and the second clamping part, and a diaphragm placing gap is formed between the first clamping part and the second clamping part;
the first electrode is arranged on one side of the shell in a left-right moving mode, and when the first electrode moves to one side attached to the first clamping portion, a groove is formed between the first electrode and the first through hole;
the second electrode is arranged on the other side of the shell in a manner of moving left and right, and forms a groove together with the second through hole when moving to one side attached to the second clamping part;
a heating structure;
the temperature measuring structure is arranged on one side, close to the first through hole, of the first electrode and can be inserted into the first through hole; the second electrode is arranged on one side, close to the second through hole, of the second electrode and can be inserted into the second through hole.
2. The battery separator ionic conductivity testing apparatus of claim 1, wherein: the first electrode comprises a first fixing part and a first extending part, the first fixing part is arranged on the outer side of the shell, and the first extending part penetrates through the side wall of the shell and extends into the shell.
3. The battery separator ionic conductivity testing apparatus of claim 2, wherein: the first extending part comprises a first connecting part and a first protruding part, the cross section area of the first connecting part is larger than that of the first through hole, and when the first connecting part is attached to the outer side wall of the clamping structure, the first protruding part is embedded into a groove formed by the first connecting part and the first through hole.
4. The battery separator ionic conductivity testing apparatus of claim 3, wherein: the second electrode has the same structure as the first electrode and is symmetrically arranged.
5. The battery separator ionic conductivity testing apparatus of claim 1, wherein: the clamping structure is of a split structure or is integrally formed.
6. The battery separator ionic conductivity testing apparatus of claim 1, wherein: the heating structure is a resistance wire, one end of the resistance wire is arranged on the first electrode and the second electrode, and the other end of the resistance wire is connected with the heater.
7. The battery separator ionic conductivity testing apparatus of claim 1, wherein: the temperature measuring structure is a thermocouple.
8. The battery separator ionic conductivity test apparatus according to any one of claims 1 to 7, wherein: the shell, the outer layer of the first electrode, the outer layer of the second electrode and the outer layer of the temperature measuring structure are made of any one of polytetrafluoroethylene, polyphenylene sulfide, polyvinylidene fluoride, polypropylene, polyethylene and polycarbonate.
9. The battery separator ionic conductivity test apparatus according to any one of claims 1 to 7, wherein: still including annotating the liquid hole with go out the liquid hole, annotate the liquid hole with it all sets up to go out the liquid hole the upper portion of casing is and set up the both sides of splint structure.
10. A battery separator ionic conductivity testing method applied to the battery separator ionic conductivity testing device of any one of claims 1 to 9, comprising:
injecting electrolyte into the shell;
inserting the gripping structure with the septum into the housing;
heating the first electrode and the second electrode, measuring the temperature near the diaphragm in real time, and measuring the impedance value between the two electrodes at different temperatures T;
respectively measuring resistance values R1, R2 and Rn of 1 layer of the diaphragm, 2 layers of the diaphragm and n layers of the diaphragm;
and obtaining the ionic conductivity of the diaphragm through the average impedance value of the diaphragm, the thickness value of the diaphragm and the effective area value of the electrode in different layers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010377449.5A CN111579871A (en) | 2020-05-07 | 2020-05-07 | Device and method for testing ionic conductivity of battery diaphragm |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010377449.5A CN111579871A (en) | 2020-05-07 | 2020-05-07 | Device and method for testing ionic conductivity of battery diaphragm |
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| CN111579871A true CN111579871A (en) | 2020-08-25 |
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| CN202010377449.5A Pending CN111579871A (en) | 2020-05-07 | 2020-05-07 | Device and method for testing ionic conductivity of battery diaphragm |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113267681A (en) * | 2021-07-15 | 2021-08-17 | 国家电投集团氢能科技发展有限公司 | Proton exchange membrane conductivity test system |
| CN113267682A (en) * | 2021-07-20 | 2021-08-17 | 江西睿达新能源科技有限公司南昌分公司 | Conductivity testing device for lithium battery diaphragm |
| 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 |
| CN113687144A (en) * | 2021-07-30 | 2021-11-23 | 蜂巢能源科技有限公司 | Testing device and testing method for diaphragm ionic conductivity |
| WO2023091474A1 (en) * | 2021-11-17 | 2023-05-25 | Celgard, Llc | Battery separators and methods for testing the same |
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2020
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113267681A (en) * | 2021-07-15 | 2021-08-17 | 国家电投集团氢能科技发展有限公司 | Proton exchange membrane conductivity test system |
| CN113267681B (en) * | 2021-07-15 | 2021-09-28 | 国家电投集团氢能科技发展有限公司 | Proton exchange membrane conductivity test system |
| CN113267682A (en) * | 2021-07-20 | 2021-08-17 | 江西睿达新能源科技有限公司南昌分公司 | Conductivity testing device for lithium battery diaphragm |
| CN113267682B (en) * | 2021-07-20 | 2021-11-23 | 江西睿达新能源科技有限公司 | Conductivity testing device for lithium battery diaphragm |
| CN113687144A (en) * | 2021-07-30 | 2021-11-23 | 蜂巢能源科技有限公司 | Testing device and testing method for diaphragm ionic conductivity |
| WO2023091474A1 (en) * | 2021-11-17 | 2023-05-25 | Celgard, Llc | Battery separators and methods for testing the same |
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