CN210071718U - Lithium battery diaphragm obturator-rupture of membranes temperature-detecting device - Google Patents
Lithium battery diaphragm obturator-rupture of membranes temperature-detecting device Download PDFInfo
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- CN210071718U CN210071718U CN201920467658.1U CN201920467658U CN210071718U CN 210071718 U CN210071718 U CN 210071718U CN 201920467658 U CN201920467658 U CN 201920467658U CN 210071718 U CN210071718 U CN 210071718U
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 59
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 239000012528 membrane Substances 0.000 title claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 82
- 238000012360 testing method Methods 0.000 claims abstract description 58
- 239000011148 porous material Substances 0.000 claims abstract description 23
- 238000005485 electric heating Methods 0.000 claims abstract description 21
- 238000007789 sealing Methods 0.000 claims abstract description 19
- 230000008859 change Effects 0.000 claims abstract description 12
- 230000017525 heat dissipation Effects 0.000 claims abstract description 10
- 238000001514 detection method Methods 0.000 claims description 13
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 3
- 229910052731 fluorine Inorganic materials 0.000 claims description 3
- 239000011737 fluorine Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 11
- 238000010998 test method Methods 0.000 abstract description 6
- 230000001360 synchronised effect Effects 0.000 abstract description 5
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 239000003792 electrolyte Substances 0.000 description 5
- 230000035772 mutation Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 206010000369 Accident Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses a lithium battery diaphragm obturator-rupture of membranes temperature-detecting device and test method thereof, include: the device comprises a cylindrical heating main board, a cylindrical testing bottom board, a lithium battery diaphragm, a heating controller, an electric heating rod, a temperature measuring hole, a thermocouple, a resistance measuring hole, a resistance measuring sensor, a resistance measuring movable block, a heating movable block, a temperature measuring instrument, a resistance measuring instrument, a heating hole, an adjusting bolt, a spring, a circular sealing ring, a rectangular heat dissipation hole and a bolt, wherein the diaphragm is sealed in a cavity of the cylindrical testing bottom board. The using method comprises the following steps: the heating rod is inserted into the heating hole, and the temperature and the internal resistance are displayed in real time by a computer; along with the temperature rise of the heating rod, the temperature of the whole device rises, when the temperature rises to a certain value, the micropores of the diaphragm are gradually closed, the resistance value rapidly rises, and accordingly the closed pores of the diaphragm are judged; when the temperature continues to rise, the diaphragm is broken, the resistance value is suddenly reduced, and the temperature value is the film breaking temperature. The utility model has the advantages of convenient use, real-time display, synchronous internal resistance change along with temperature and small error range.
Description
Technical Field
The utility model relates to a device and test method that can accurate detection lithium cell diaphragm obturator-rupture of membranes temperature.
Background
With the development of science and technology, lithium batteries become the mainstream of power battery development, and have the advantages of high specific energy, wide working temperature range, stable discharge and the like, but various potential safety hazards exist in the use process at present to restrict the development of the lithium batteries. The safety is a factor which must be considered by the battery, wherein the closed pore temperature and the film breaking temperature of the diaphragm are important indexes for ensuring the safety of the lithium ion battery. The existing lithium battery mainly comprises an anode, a cathode, electrolyte and a diaphragm, wherein the diaphragm is mainly used for separating the anode and the cathode, preventing the anode and the cathode from being in direct contact to generate short circuit, preventing electrons from passing through and allowing ions to pass through; the quality of the performance of the separator determines the interface structure and the internal resistance of the battery, and further influences the capacity, the cyclicity, the charge-discharge current density and other key characteristics of the lithium battery, so that the quality of the performance of the separator plays an important role in improving the comprehensive performance of the battery. When the internal temperature of the lithium battery rises, the diaphragm closes the micropores, prevents lithium ions from passing through, cuts off the connection between the positive electrode and the negative electrode, stops the internal chemical reaction of the battery, and improves the safety of the battery.
The structure of the lithium battery diaphragm is composed of a large number of micropores, and the pore diameter is less than 1 mu m. The temperature of the battery is rapidly raised due to heat generated by short circuit in the battery, when the temperature is raised to a certain degree, the micropores of the diaphragm are slowly closed, so that the internal resistance of the battery is increased until the micropores of the diaphragm are completely closed, the reaction of the positive electrode and the negative electrode in the battery is completely stopped, the internal temperature of the battery is controlled, the phenomenon of thermal runaway is prevented, and safety accidents such as explosion or fire of the lithium battery are effectively prevented. The lower the diaphragm closed-pore temperature value is, the earlier the time for closing the internal reaction of the battery is under the condition of short circuit, the safer the lithium battery is, and on the contrary, the battery safety is difficult to guarantee. The closed cell temperature of the separator must be in a proper range and should be higher than the ambient temperature in which the battery is used to ensure that the battery is normally used.
If the heat generated in the battery cannot be dissipated in time, the heat is accumulated in the lithium battery, the temperature continues to rise after the diaphragm is closed, the diaphragm is broken and melted when the melting temperature of the diaphragm is reached, so that the positive and negative pole pieces in the battery are directly contacted together, a severe chemical reaction occurs, the internal temperature is rapidly increased again, and the phenomenon of thermal runaway is caused. The temperature rises to the melting point of lithium or the ignition point of electrolyte to cause fire accidents, and the battery is caused to be fired and exploded in serious cases, so the film breaking temperature is also an important index of the safety of the lithium battery. If the internal temperature of the battery separator is further increased after the micropores are closed by melting, the melt viscosity of the separator is reduced, and the separator is broken when reaching the film breaking temperature, and the electrodes are brought into direct contact, which causes a risk, it is necessary to maintain the shape of the separator at a temperature higher than the melting temperature. The higher the membrane rupture temperature, the longer the time for preventing ion flux and the higher the safety. The difference between the film rupture temperature and the closed cell temperature is a determining factor in determining the safety of the battery. In the actual production of the diaphragm, the closed pore-membrane breaking temperature of the diaphragm needs to be controlled and can be accurately measured, so the research on the testing device and the testing method of the diaphragm is very important for the quality control of the lithium battery diaphragm.
At present, the existing testing device and the existing testing method can not ensure the synchronism of the temperature along with the testing quantity and can not ensure the accuracy of the testing temperature range; meanwhile, most heating methods are that a testing device is placed in an oven for heating, the operation is complex and unsafe, most lithium battery diaphragm manufacturers cannot accurately measure the closed pore and the diaphragm breaking temperature of the diaphragm, the accuracy of the closed pore, the diaphragm breaking temperature range and related parameters of the provided diaphragm products is not enough, and serious potential safety hazards exist in the lithium battery products. The resistance mutation method (closed pore test method) is a method for simulating the operation of a battery, and the resistance mutation points at two sides of a diaphragm soaked in electrolyte are measured in the process of temperature rise. The resistance of the battery is tested under the condition of temperature rise, the corresponding temperature is the closed pore temperature of the diaphragm when the resistance is instantly increased, and the membrane breaking temperature is obtained when the resistance is reduced again. Specific procedures can be referred to UL 2591-. According to the current situation, a special device and a related complete detection scheme specially used for testing parameters such as the closed pore temperature and the membrane rupture temperature of the lithium battery membrane are required to be designed in the lithium battery membrane industry, so that the defects of the parameter testing method are overcome, and the safe use of the product is guaranteed. The utility model discloses testing arrangement only needs to measure the diaphragm temperature, and test method is directly perceived, easy and simple to handle, and green is pollution-free.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to overcome prior art's defect, a lithium cell diaphragm obturator-rupture of membranes temperature-detecting device and test method thereof.
In order to solve the technical problem, the utility model provides a following technical scheme: a detection device for the closed-pore membrane breaking temperature of a lithium battery diaphragm comprises: the device comprises a cylindrical heating main board, a cylindrical testing bottom board, a lithium battery diaphragm, a heating controller, a temperature measuring hole, a resistance measuring movable block, a heating movable block, a temperature measuring instrument, a resistance measuring instrument, a heating hole, an adjusting bolt, a spring, a circular sealing ring, a rectangular heat dissipation hole and a bolt, wherein the cylindrical heating main board is in threaded connection with the cylindrical testing bottom board; the heating hole is used for placing an electric heating rod, and the electric heating rod is connected with the heating controller; two symmetrical heat dissipation holes are formed in the two sides of the cylindrical heating main board; a resistance measuring movable block is arranged below the heating movable block and is connected with a resistance measuring instrument, a circular sealing ring is arranged below the resistance measuring movable block, and the resistance measuring movable block is directly contacted with a lithium battery diaphragm through an inner hole of the circular sealing ring arranged below the resistance measuring movable block; a resistance measuring bottom hole is arranged below the lithium battery diaphragm and connected with a resistance measuring instrument; the side end of the center of the cylindrical test bottom plate is provided with two symmetrical temperature measuring holes, and the temperature measuring holes are connected with a temperature measuring instrument; the lower end of the cylindrical test bottom plate is provided with two symmetrical threading holes, and one side of each threading hole is provided with two rectangular heat dissipation holes.
The adjusting bolt is composed of a full threaded rod, a spring is convenient to adjust, and the adjusting distance range is 0-20 mm.
The electric heating rod penetrates through the heating movable block through the heating hole, so that the heating is convenient and uniform, and the heating temperature range is 0-300 ℃.
The resistance measuring movable block is composed of a resistance measuring cylinder and a resistance measuring handle, and the resistance measuring handle is convenient for placing the resistance measuring movable block.
The circular sealing ring is made of insulating green fluorine rubber, resists high temperature of 200-350 ℃, and has an inner diameter larger than the diameter of the resistance measuring cylinder of the resistance measuring movable block.
The distance between the resistance measuring bottom hole and the lithium battery diaphragm is 1-5mm, so that the resistance measuring sensor can conveniently and quickly sense the resistance change.
The temperature measuring holes are of a symmetrical structure, the length of the temperature measuring holes is 0-20mm, the width of the temperature measuring holes is 0-35mm, and the distance between each side of the temperature measuring holes and the lithium battery diaphragm is 0.5-5 mm.
Furthermore, cylinder heating mainboard and cylinder test bottom plate, adjusting bolt, heating movable block, resistance-measuring movable block, spring, electrical heating stick top layer, bolt are the stainless steel.
A testing method of a lithium battery diaphragm closed-pore-membrane-breaking temperature detection device comprises the following steps:
1) cutting a lithium battery diaphragm into square samples (15 mm x 15 mm), soaking in the electrolyte for about 10-15 minutes, and sealing in a cavity of a cylindrical test bottom plate;
2) setting the heating rate (10-60 ℃/min) of the heating controller to be 200 ℃ as required, and electrifying the electric heating rod;
3) setting the same synchronous sampling speed of 10-100 ms for the temperature measuring instrument and the resistance measuring instrument, collecting a temperature value and an internal resistance value, displaying a temperature-resistance change curve in real time on a computer interface, recording the temperature T, and corresponding to the internal resistance value R;
4) along with the temperature rise of the electric heating rod, the temperature of the whole device rises, when the temperature rises to the range of 130-140 ℃, micropores of the lithium battery diaphragm are gradually closed, the internal resistance value rises rapidly, and the closed pore temperature is judged according to the resistance mutation point; when the temperature is continuously increased to the range of 160-170 ℃, the diaphragm starts to crack, the internal resistance is suddenly reduced, and the film-breaking temperature is judged according to the internal resistance.
Compared with the prior art, the utility model beneficial effect who has is:
(1) the utility model adopts the basic principle of the resistance method, seals the diaphragm between the cylindrical testing bottom plate and the resistance measuring movable block, creatively adopts the electric heating method to be combined with the resistance method, detects the parameters of the obturator temperature and the melting film breaking temperature of the lithium battery diaphragm, and provides guidance for the actual production through the parameters of the obturator temperature and the melting film breaking temperature of the diaphragm under the conditions of different temperatures and different internal resistances, thereby solving the problem of single heating source of the diaphragm obturator-film breaking detecting device, replacing the existing oven heating, and solving the problem of inconvenient heating;
(2) the lower part of the adjusting bolt is fixedly connected with the spring, and the spring can relieve the elastic force generated by the metal movable block due to expansion with heat and contraction with cold in a heating state; meanwhile, the stress of the spring can be changed by adjusting the bolt, the heating movable block is ensured to be in contact with the resistance measuring movable block, and the pressure of the resistance measuring movable block is changed, so that the lithium battery diaphragm is in better overall contact with the cylindrical test bottom plate and the resistance measuring movable block;
(3) the utility model discloses a host computer software of butt joint sensor or thermocouple contains real-time curve demonstration, data record, data storage, data query and derives. Real-time curve: the horizontal axis represents temperature (DEG C) and the vertical axis represents internal resistance (omega/cm)2) The maximum sampling speed is 10ms, the internal resistance changes in real time along with the temperature, and the internal resistance corresponds to the temperature one by one. The problem that the existing internal resistance is asynchronous along with the temperature change is solved, and the error range of test data is reduced;
the utility model has the advantages of simple structure, convenient to use, real-time display data, internal resistance along with temperature synchronous variation, error range are little.
Drawings
FIG. 1 is a schematic view of the connection of the present invention in use;
the reference numbers in the figures are: 1-cylindrical heating of the main plate; 2-cylindrical test base plate; 3-adjusting the bolt; 4-a spring; 5-heating the hole; 6-heating the movable block; 7-resistance measuring movable block; 8-resistance measurement holes; 9-circular sealing ring; 10-temperature measuring hole; 11-rectangular heat dissipation holes; 12-threading holes; 13-measuring a resistance bottom hole; 14-heat dissipation holes; 15-lithium battery separator; 16-an electrical heating rod; 17-a heating controller;
18-a resistance meter; 19-a temperature measuring instrument; 20-a computer.
Fig. 2 is a front view of the present invention.
Fig. 3 is a three-dimensional structure diagram of the present invention.
Fig. 4 is a schematic diagram of the internal resistance of the present invention varying with temperature.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The device for detecting the closed-pore membrane breaking temperature of the lithium battery diaphragm shown in fig. 1 comprises: the device comprises a cylindrical heating main board 1, a cylindrical testing bottom board 2, an adjusting bolt 3, a spring 4, a heating hole 5, a heating movable block 6, a resistance measuring movable block 7, a resistance measuring hole 8, a circular sealing ring 9, a temperature measuring hole 10, a rectangular heat radiating hole 11, a threading hole 12, a resistance measuring bottom hole 13, a heat radiating hole 14, a lithium battery diaphragm 15, an electric heating rod 16, a heating controller 17, a resistance measuring instrument 18, a temperature measuring instrument 19 and a computer 20, wherein the cylindrical heating main board 1 is in threaded connection with the cylindrical testing bottom board 2, the adjusting bolt 3 is arranged above a cylindrical cavity, the lower part of the adjusting bolt 3 is fixedly connected with the spring 4, the adjusting bolt 3 is composed of a full threaded rod, the spring 4 is convenient to adjust, the adjusting distance range is 0-20mm, the heating movable block is arranged below the spring 4, and the heating movable block 6 is provided with a horizontal; the heating hole 5 is used for placing an electric heating rod 16, and the electric heating rod 16 is connected with a heating controller 17; the electric heating rod 16 penetrates through the heating movable block 6 through the heating hole 5, so that the heating is convenient and uniform, the heating temperature range is 0-300 ℃, and two symmetrical heat dissipation holes 14 are formed in two sides of the cylindrical heating main board 1; a resistance measuring movable block 7 is arranged below the heating movable block 6, the resistance measuring movable block 7 is composed of a resistance measuring cylinder and a resistance measuring handle, the resistance measuring handle is convenient for placing the resistance measuring movable block 7, the resistance measuring movable block 7 is connected with a resistance measuring instrument 18, a circular sealing ring 9 is arranged below the resistance measuring movable block 7, the circular sealing ring 9 is made of insulating green fluorine glue, is resistant to high temperature of 200-350 ℃, has an inner diameter larger than the diameter of the resistance measuring cylinder of the resistance measuring movable block 7, and the resistance measuring movable block 7 is directly contacted with a lithium battery diaphragm 15 through an inner hole below which the circular sealing ring 9 is arranged; a resistance measuring bottom hole 13 is formed below the lithium battery diaphragm 15, the resistance measuring bottom hole 13 is connected with a resistance measuring instrument, and the distance between the resistance measuring bottom hole 13 and the lithium battery diaphragm 15 is 1-5mm, so that a resistance measuring sensor can conveniently and rapidly sense resistance change; two symmetrical temperature measuring holes 10 are formed in the side end of the center of the cylindrical test bottom plate 2, the temperature measuring holes 10 are of symmetrical structures, the length is 0-20mm, the width is 0-35mm, and the distance between each side and the lithium battery diaphragm 15 is 0.5-5 mm; the temperature measuring hole 10 is connected with a temperature measuring instrument 19; the lower end of the cylindrical test bottom plate 2 is provided with two symmetrical threading holes 12, and one side of each threading hole 12 is provided with two rectangular heat dissipation holes 11.
The cylinder heating main board 1, the cylinder testing bottom board 2, the adjusting bolt 4, the heating movable block 6, the resistance measuring movable block 7, the spring 4, the electric heating rod 16 surface layer and the bolts are all made of stainless steel.
A testing method of a testing device for a closed-pore membrane breaking temperature of a lithium battery diaphragm comprises the following steps:
1) cutting the lithium battery diaphragm into square samples (15 mm x 15 mm) with the same size and slightly smaller than the cross-sectional area of the cylindrical test base plate, and soaking the square samples in electrolyte for about 10-15 minutes;
2) sealing a diaphragm in a cavity of a cylindrical testing bottom plate through the cylindrical testing bottom plate, a resistance measuring movable block, a circular sealing ring and a cylindrical heating main plate, wherein the circular sealing ring and the resistance measuring movable block are placed above the diaphragm, and the bottom of the circular sealing ring and the resistance measuring movable block are in contact with the diaphragm;
3) the cylindrical heating main board and the cylindrical testing bottom board are matched into a whole, the stress of a spring is adjusted by adjusting an adjusting bolt of the heating main board, the heating movable block is ensured to be in contact with the resistance measuring movable block, and meanwhile, the pressure of the resistance measuring movable block is changed;
4) an electric heating rod of the heating controller is inserted into a heating hole of the heating movable block, the temperature rate (10-60 ℃/min) of the heating controller is set to be 200 ℃ as required, and the electric heating rod is electrified;
5) connecting a thermodetector to temperature measuring holes in two sides of the cylindrical test bottom plate through temperature measuring lines, connecting the thermodetector with a computer, opening an 'on' button of the thermodetector, and setting the measuring range of the thermodetector to be 0-200 ℃;
6) connecting a thermodetector to temperature measuring holes on two sides of the cylindrical test bottom plate through temperature measuring wires, connecting the thermodetector to a computer, opening an 'on' button of the thermodetector, and setting the measuring range of the thermodetector to be 0-10000ohms/m2；
7) Opening a computer, starting upper computer software, clicking a START button 'START', starting a test, setting the same synchronous sampling speed of a temperature measuring instrument and a resistance measuring instrument for 10ms-100ms, collecting a temperature value and an internal resistance value, displaying a temperature-resistance change curve in real time on a computer interface, recording the temperature T, and corresponding to the internal resistance value R;
8) along with the temperature rise of the electric heating rod, the temperature of the whole device rises, when the temperature rises to the range of 130-140 ℃, micropores of the lithium battery diaphragm are gradually closed, the internal resistance value rises rapidly, and the closed pore temperature is judged according to the resistance mutation point; when the temperature is continuously increased to the range of 160-170 ℃, the diaphragm starts to break, the internal resistance suddenly drops, and the diaphragm breaking temperature is judged according to the internal resistance;
9) data arrangement: and inquiring and deriving related data, and judging the closed pore temperature and the film breaking temperature of the lithium battery diaphragm according to the resistance mutation point on the temperature-resistance change curve.
Table 1 different membrane samples test results
10) After the membrane rupture and the membrane rupture temperature are measured, the power supplies of the temperature measuring instrument and the resistance measuring instrument are closed, the connecting wire of the testing device is removed, and the resistance measuring movable block is taken out; cleaning the resistance measuring movable block, replacing a sample, and repeatedly testing according to the method; if the difference between the closed pore temperature and the membrane rupture temperature of the two tests exceeds 2 ℃, the detection needs to be carried out again.
11) After the test is finished, the heating controller is closed, the electric heating rod is taken out from the heating hole, and the electric heating rod is placed at room temperature; and disassembling the detection device and cleaning the testing device parts.
The device is small in size, simple in structure and convenient to operate, the adjusting bolt and the spring play a good adjusting role, when the circular sealing ring and metal expand due to heating, the spring automatically stretches according to the change of the air pressure in the device, and the phenomenon that a lithium battery diaphragm deforms due to large stress to cause test failure is avoided; the circular heating main board and the circular testing main board of the testing device are provided with the heat dissipation holes, so that air pressure of the stabilizing device is facilitated, and the problem that a lithium battery diaphragm is unevenly heated is solved.
The testing device displays a real-time curve, records data, stores the data, queries and exports the data; the maximum sampling speed is 10ms, the internal resistance changes in real time along with the temperature, and the internal resistance corresponds to the temperature one by one; the problem that the existing internal resistance is asynchronous along with the temperature change is solved, and the error range of test data is reduced; meanwhile, the trouble that the resistance of the testing device is slow in reduction rate after the membrane is broken, no obvious inflection point exists, the membrane breaking temperature is difficult to judge is solved, and the testing accuracy is improved. The design adopted by the device has obvious advantages in the aspects of temperature rise rate and synchronous change with internal resistance, the test time is less, and the working efficiency is high; the testing device is simple and convenient to assemble, the resistance measuring instrument and the temperature measuring instrument are high in precision, and the reproducibility and consistency of the temperature and internal resistance testing results are good.
It is right above the utility model relates to a lithium cell diaphragm obturator-rupture of membranes temperature-detecting device and test method explains for help understands the utility model discloses, nevertheless the utility model discloses an embodiment does not receive the restriction of above-mentioned embodiment, and any does not deviate from the utility model discloses change, modification, substitution, combination, simplification made under the principle all should be equivalent replacement mode, all contain within the protection scope the utility model discloses a.
Claims (8)
1. The utility model provides a lithium battery diaphragm obturator-rupture of membranes temperature-detecting device which characterized in that: the device comprises a cylindrical heating main board (1) and a cylindrical testing bottom board (2), wherein a cylindrical cavity is formed in the middle of the cylindrical heating main board (1), the cylindrical heating main board (1) is in threaded connection with the cylindrical testing bottom board (2), an adjusting bolt (3) is arranged above the cylindrical cavity, the lower part of the adjusting bolt (3) is fixedly connected with a spring (4), a heating movable block (6) is arranged below the spring (4), and the heating movable block (6) is provided with a horizontal heating hole (5); the heating hole (5) is used for placing an electric heating rod (16), and the electric heating rod (16) is connected with a heating controller (17); two symmetrical heat dissipation holes (14) are formed in the two sides of the cylindrical heating main board (1); a resistance measuring movable block (7) is arranged below the heating movable block (6), the resistance measuring movable block (7) is connected with a resistance measuring instrument (18), a circular sealing ring (9) is arranged below the resistance measuring movable block (7), and the resistance measuring movable block (7) is directly contacted with a lithium battery diaphragm (15) through an inner hole below which the circular sealing ring (9) is arranged; a resistance measuring bottom hole (13) is arranged below the lithium battery diaphragm (15), and the resistance measuring bottom hole (13) is connected with a resistance measuring instrument (18); two symmetrical temperature measuring holes (10) are formed in the side end of the center of the cylindrical testing bottom plate (2), and the temperature measuring holes (10) are connected with a temperature measuring instrument (19); the lower end of the cylindrical test bottom plate (2) is provided with two symmetrical threading holes (12), and one side of each threading hole (12) is provided with two rectangular heat dissipation holes (11).
2. The lithium battery diaphragm closed-pore membrane-breaking temperature detection device of claim 1, characterized in that: the adjusting bolt (3) is composed of a full threaded rod, a spring (4) is convenient to adjust, and the adjusting distance range is 0-20 mm.
3. The lithium battery diaphragm closed-pore membrane-breaking temperature detection device of claim 1, characterized in that: the electric heating rod (16) penetrates through the heating movable block (6) through the heating hole (5), so that the heating is convenient and uniform, and the heating temperature range is 0-300 ℃.
4. The lithium battery diaphragm closed-pore membrane-breaking temperature detection device of claim 1, characterized in that: the resistance measuring movable block (7) is composed of a resistance measuring cylinder and a resistance measuring handle, and the resistance measuring handle is convenient for placing the resistance measuring movable block (7).
5. The lithium battery diaphragm closed-pore membrane-breaking temperature detection device of claim 1, characterized in that: the circular sealing ring (9) is made of insulating green fluorine rubber, resists high temperature of 200-350 ℃, and has an inner diameter larger than the diameter of a resistance measuring cylinder of the resistance measuring movable block (7).
6. The lithium battery diaphragm closed-pore membrane-breaking temperature detection device of claim 1, characterized in that: the distance between the resistance measuring bottom hole (13) and the lithium battery diaphragm (15) is 1-5mm, so that the resistance measuring sensor can conveniently and quickly sense the resistance change.
7. The lithium battery diaphragm closed-pore membrane-breaking temperature detection device of claim 1, characterized in that: the temperature measuring holes (10) are of symmetrical structures, the length is 0-20mm, the width is 0-35mm, and the distance from each side to the lithium battery diaphragm (15) is 0.5-5 mm.
8. The lithium battery diaphragm closed-pore membrane-breaking temperature detection device of claim 1, characterized in that: the cylinder heating main board (1), the cylinder testing bottom board (2), the adjusting bolt (3), the heating movable block (6), the resistance measuring movable block (7), the spring (4), the electric heating rod (16) surface layer and the bolt are all made of stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920467658.1U CN210071718U (en) | 2019-04-09 | 2019-04-09 | Lithium battery diaphragm obturator-rupture of membranes temperature-detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920467658.1U CN210071718U (en) | 2019-04-09 | 2019-04-09 | Lithium battery diaphragm obturator-rupture of membranes temperature-detecting device |
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| Publication Number | Publication Date |
|---|---|
| CN210071718U true CN210071718U (en) | 2020-02-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920467658.1U Withdrawn - After Issue CN210071718U (en) | 2019-04-09 | 2019-04-09 | Lithium battery diaphragm obturator-rupture of membranes temperature-detecting device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109916951A (en) * | 2019-04-09 | 2019-06-21 | 中材锂膜有限公司 | A kind of lithium battery diaphragm closed pore-broken film temperature detection device and its test method |
-
2019
- 2019-04-09 CN CN201920467658.1U patent/CN210071718U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109916951A (en) * | 2019-04-09 | 2019-06-21 | 中材锂膜有限公司 | A kind of lithium battery diaphragm closed pore-broken film temperature detection device and its test method |
| CN109916951B (en) * | 2019-04-09 | 2024-05-17 | 中材锂膜有限公司 | Device and method for detecting closed pore-rupture temperature of lithium battery diaphragm |
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