CN108279161B - Stacked lithium ion battery diaphragm simulation on Mechanical test macro - Google Patents
Stacked lithium ion battery diaphragm simulation on Mechanical test macro Download PDFInfo
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- CN108279161B CN108279161B CN201711484990.0A CN201711484990A CN108279161B CN 108279161 B CN108279161 B CN 108279161B CN 201711484990 A CN201711484990 A CN 201711484990A CN 108279161 B CN108279161 B CN 108279161B
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- diaphragm
- lithium ion
- ion battery
- battery charging
- simulation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
Abstract
The present invention relates to a kind of Stacked lithium ion battery diaphragm simulation on Mechanical test macros, including battery charging and discharging simulator and testing and control and data processing equipment, the battery charging and discharging simulator includes heating test section, heater, temperature controller, septum clip, screw rod, drawing mechanism and tension sensor, and the battery charging and discharging simulator is electrically connected with the testing and control with data processing equipment formation.Compared with the battery after charge and discharge to be disassembled to the art methods for taking diaphragm therein to carry out Mechanics Performance Testing again, it is carried out carrying out Mechanics Performance Testing to Stacked lithium ion battery diaphragm with Stacked lithium ion battery diaphragm simulation on Mechanical test macro of the invention, it can simplify test operation, test period cost is reduced, while obtaining unfailing test data.
Description
Technical field
The present invention relates to lithium-ion membrane fields, relate more specifically to a kind of Stacked lithium ion battery diaphragm mechanical property
Simulated testing system.
Background technique
The four of lithium ion battery are big, and crucial main material is anode, cathode, diaphragm and electrolyte.Diaphragm plays prevent in the battery
The insulating effect of positive and negative anodes contact short circuit, while the effect of ion transmission channel being provided in charge and discharge process.The performance of diaphragm
It all has a certain impact to characteristics such as the internal resistance of battery, capacity, cycle performance and security performances.
Common diaphragm is polyolefin macromolecular material, itself has good mechanical performance and anti-fatigue performance.But
In cell operations, immersion of the diaphragm by electrolyte, and in charge and discharge the expansion of battery pole piece can make diaphragm by
To upholding repeatedly, causes the mechanical property of diaphragm that can change, be usually expressed as the reduction of tensile strength and elasticity modulus.Electricity
Solution liquid soaking time is longer, and battery charging and discharging number is more, i.e., diaphragm is more by extension/contraction/extension number, mechanical property
It can be lower.
Lithium ion battery includes coiled lithium ion battery and Stacked lithium ion battery.Stacked lithium ion battery be by
All anodes are welded together extraction, cathode by the sequence multiple-level stack of " anode, diaphragm, cathode, diaphragm, anode ... "
It is also welded to and draws and constitute together.For Stacked lithium ion battery in charge and discharge, the expansion of pole piece can make diaphragm by longitudinal direction
Stretch pulling force.
For mechanical property of the test diaphragm after multiple charge and discharge cycles, diaphragm its mechanics after how many times recycle is determined
Performance is not up to standard, and existing way is to disassemble the battery after charge and discharge, takes out diaphragm therein and carries out mechanical property survey
Examination.This test job is very cumbersome, test period higher cost.Therefore, this field need a kind of simple and easy device and
Method, to test the mechanical property of lithium ion battery separator.
Summary of the invention
The technical problem that it is an object of the invention to overcome the test method of the prior art cumbersome and at high cost, provides one kind
Simple and easy simulated testing system, for the mechanical property of simulation test Stacked lithium ion battery diaphragm, specifically
The tensile strength and elasticity modulus of diaphragm.
Therefore, the present invention provides a kind of Stacked lithium ion battery diaphragm simulation on Mechanical test macro.The test system
System includes battery charging and discharging simulator and testing and control and data processing equipment, which includes heating
Test section, heater, temperature controller, septum clip, screw rod, drawing mechanism and tension sensor, the battery charging and discharging simulator
It is electrically connected with the testing and control with data processing equipment formation.
In one embodiment, which includes that programmable logic controller (PLC) and data are adopted with data processing equipment
Collect output device, the battery charging and discharging simulator and the programmable logic controller (PLC) and data acquisition output device forms electricity
Connection, and the programmable logic controller (PLC) is electrically connected with data acquisition output device formation.
In another embodiment, the testing and control and data processing equipment are computer installation, the battery charging and discharging
Simulator is electrically connected with computer installation formation.That is, in the present embodiment, which is integrated with programmable patrol
It collects controller and data acquires output device.
The battery charging and discharging simulator is for simulating Stacked lithium ion battery charge and discharge after membrane stress coping behavior.
The testing and control and data processing equipment or the specifically computer installation are for controlling the battery charging and discharging simulator
Test operation simultaneously acquires the data signal under test of the battery charging and discharging simulator and outputs test data.The programmable logic control
For device processed for editing different programs to control the test operation of the battery charging and discharging simulator, which acquires output device
For acquiring the data signal under test of the battery charging and discharging simulator and outputing test data.
Heater, septum clip and the screw rod of the battery charging and discharging simulator are located at the battery charging and discharging simulator
It heats in test section, temperature controller, drawing mechanism and the tension sensor of the battery charging and discharging simulator are located at the battery charge and discharge
Outside the heating test section of electric copying device.
Specifically, the septum clip include the first septum clip and the second septum clip, lithium ion battery to be tested every
Membrane sample is fixed in the heating test section by the first septum clip and the second septum clip.
The temperature controller of the battery charging and discharging simulator and the testing and control and data processing equipment or this programmable patrol
It collects controller and forms electrical connection, and be electrically connected with heater formation, filled for receiving from the testing and control and data processing
It sets or the heating signal of the programmable logic controller (PLC), controls the heater and heat temperature raising is carried out to the heating test section, and
The temperature of the heating test section is measured to control the heated condition of the heater, the temperature of the heating test section is made to be maintained at setting
Value, the temperature that diaphragm is subject to when simulating lithium ion battery charge and discharge.The heater not with the sample membrane contacts, but protect
Certain distance is held, to prevent from directly heating the sample diaphragm.
The drawing mechanism of the battery charging and discharging simulator is located at the lower section of the heating test section, and passes through the screw rod and the
Two septum clips form mechanical connection, for stretching the second septum clip to stretch the diaphragm sample, and with the test control
System is electrically connected with data processing equipment or programmable logic controller (PLC) formation, comes from the testing and control and data for receiving
The stretch signal of processing unit or the programmable logic controller (PLC) moves down the second septum clip along screw rod, thus
Stretch the diaphragm sample downwards.Specifically, drawing mechanism is servo motor or stepper motor.
The tension sensor of the battery charging and discharging simulator is located at the top of the heating test section, and with the first diaphragm clip
Tool forms mechanical connection, the pulling force being subject to for measuring the diaphragm sample, and with the testing and control and data processing equipment or
Person's programmable logic controller (PLC) forms electrical connection, for measured value of thrust to be transferred to the testing and control and data processing
Device or the programmable logic controller (PLC).
The heater, temperature controller and tension sensor are commercially available.For example, the long-range Machinery Co., Ltd. in Dongguan can be selected
Heating rod as the heater, select the temperature control system of Omron brand as the temperature controller, select Shenzhen Odyssey wound
The tension sensor of precision instrument Co., Ltd is as the tension sensor.Alternatively, can according to need the customization heater, temperature
Control device perhaps tension sensor this be well known to those skilled in the art or be easy by simply experiment determine.
In the reality that the testing and control and data processing equipment include programmable logic controller (PLC) and data acquisition output device
It applies in scheme, which is electrically connected with the programmable logic controller (PLC) and data acquisition output device formation
It connects, and the programmable logic controller (PLC) is electrically connected with data acquisition output device formation.The programmable logic controller (PLC) to
The temperature controller issues temperature signal, issues stretch signal to the drawing mechanism, it is programmable by this which acquires output device
Logic controller receives pulling force data from the tension sensor.
In the embodiment that the testing and control and data processing equipment are computer installation, battery charging and discharging simulation dress
It sets and is electrically connected with computer installation formation, which plays the test for controlling the battery charging and discharging simulator simultaneously
Process and the effect for acquiring and outputing test data.Those skilled in the art can be programmed the computer installation to realize
This effect.Specifically, which issues temperature signal to the temperature controller, issues stretch signal to the drawing mechanism,
Pulling force data is received from the tension sensor.
The programmable logic controller (PLC) and data acquisition output device are commercially available.For example, Siemens's product can be selected
The programmable logic controller (PLC) of board selects the data acquisition module of Siemens plus Dell's electricity as the programmable logic controller (PLC)
Brain acquires output device as the data.It is adopted alternatively, can according to need and customize the programmable logic controller (PLC) or the data
Collect output device, this is well known to those skilled in the art or is easy to determine by simply experiment.
The mode of electrical connection above-mentioned or mechanical connection can realize that this is ability according to mode well known in the art
Known to field technique personnel.
Beneficial effects of the present invention
Stacked lithium ion battery is incited somebody to action by the sequence multiple-level stack of " anode, diaphragm, cathode, diaphragm, anode ... "
All anodes weld together extraction, and cathode, which is also welded to, draws and constitute together.Stacked lithium ion battery in charge and discharge,
The expansion of pole piece can make diaphragm by longitudinal drawing force.Stacked lithium ion battery diaphragm simulation on Mechanical of the invention is surveyed
Test system can simulate position orientation, temperature condition and force way of the lithium-ion membrane in Stacked lithium ion battery, just
In the R&D work in lithium-ion membrane, the simulation test of tensile strength and elasticity modulus is carried out to lithium-ion membrane sample,
It test result and is made after Stacked lithium ion battery with same lithium-ion membrane sample and carries out charge and discharge under similar conditions
It is close to test resulting test result.Diaphragm therein is taken to carry out mechanical property survey again with the battery after charge and discharge is disassembled
The art methods of examination are compared, and carry out power with Stacked lithium ion battery diaphragm simulation on Mechanical test macro of the invention
Performance test is learned, can simplify test operation, reduces test period cost, while obtaining unfailing test data.
Detailed description of the invention
Fig. 1 is the Stacked lithium ion battery diaphragm simulation on Mechanical test system of an embodiment according to the present invention
The front view of system, the component that appended drawing reference therein is expressed as follows: 10- battery charging and discharging simulator；20- testing and control and number
According to processing unit；13- temperature controller；The first septum clip of 14-；The second septum clip of 15-；16- screw rod；17- stepper motor；18-
Tension sensor.Being electrically connected for battery charging and discharging simulator and testing and control and data processing equipment is not shown in the figure.
Fig. 2 is the Stacked lithium ion battery diaphragm simulation on Mechanical test system of an embodiment according to the present invention
The rearview of system, the component that appended drawing reference therein is expressed as follows: 10- battery charging and discharging simulator；11- heats test section；
12- heater.
Fig. 3 is curve graph, it is shown that true charge and discharge test and the Stacked lithium ion battery diaphragm mechanical property with invention
After the simulation charge and discharge test that energy simulated testing system carries out, the tensile strength values and elasticity modulus of lithium ion battery separator sample
The comparison of value.
Specific embodiment
Test below in conjunction with Fig. 1, to Stacked lithium ion battery diaphragm simulation on Mechanical test macro of the invention
Operating method and simulation effect are described in detail.These descriptions are exemplary, and are not intended to limit this hair in any way
It is bright.
The experimental working technique of Stacked lithium ion battery diaphragm simulation on Mechanical test macro of the invention includes three
A stage, i.e. preparation of samples stage stretch cycle stage and mechanical meaurement stage.
1. the preparation of samples stage
After diaphragm to be tested is impregnated two hours in lithium-ion battery electrolytes, takes out and drain, it then will be through soaking
The diaphragm of bubble is cut into rectangle diaphragm sample.Suitable diaphragm sample size is obtained by experimental design.
2. stretching the cycle stage
For each diaphragm sample, step is performed the following operation:
Sample is fixed: by the first septum clip (14) of diaphragm sample battery charging and discharging simulator (10), second every
Film fixture (15) is fixed in heating test section (11)；
Heating and heat preservation: pass through testing and control and the temperature control of data processing equipment (20) to battery charging and discharging simulator (10)
Device (13) issues heating signal, and control heater (12) is warming up to the temperature of setting for test section is heated, and controls heater
(12) heated condition is so that heating test section (11) maintains the temperature of the setting；
It stretches circulation: passing through testing and control and the stepping of data processing equipment (20) to battery charging and discharging simulator (10)
Motor (17) issues stretch signal, and stepper motor (17) is made to stretch the diaphragm sample, test condition packet with the test condition of setting
Include initial tension, tensile strain rate, rate of extension, the cycle-index of stretching；
Sample recycling: after reaching cycle-index, by testing and control and data processing equipment (20) to battery charging and discharging
The temperature controller (13) of simulator (10) issues cooling signal, allows heating test section (11) to be reduced to room temperature, then will experienced
The diaphragm sample for stretching circulation is taken off from the first septum clip (14) and the second septum clip (15), in case subsequent measurement is drawn
Stretch intensity and elasticity modulus.
3. the mechanical meaurement stage
The diaphragm sample recycled and diaphragm sample that is soaking but not undergoing stretching to recycle are stretched for each experienced,
Carry out the measurement of tensile strength and elasticity modulus.Concrete operations are, by diaphragm sample battery charging and discharging simulator (10)
First septum clip (14) and the second septum clip (15) are fixed in heating test section (11) at room temperature, are controlled by test
System issues stretch signal to the stepper motor (17) of battery charging and discharging simulator (10) with data processing equipment (20), in room temperature
Under make stepper motor (17) with the rate of extension of setting stretch the diaphragm sample until fracture.According to the pulse of stepper motor (17)
Number can calculate the displacement data that diaphragm is stretched, and in conjunction with tension sensor (18) received pulling force data, can calculate drawing
Stretch intensity and elasticity modulus.
Below by way of true charge and discharge test example and simulation charge and discharge test example to Stacked lithium ion battery of the invention
The simulation effect of diaphragm simulation on Mechanical test macro compares explanation.
True charge and discharge test example
Charge and discharge test is carried out in certain Stacked lithium ion battery product of the applicant.This stacked lithium ion
The size of every layer of diaphragm is 200mm × 359mm in battery, carries out 1C charge and discharge, charge and discharge electro-temperature is respectively 60 DEG C, 70 DEG C, 80
DEG C, 90 DEG C, 100 DEG C, 110 DEG C and 120 DEG C, charge and discharge cycles number is respectively 100,200,300,400,500,600 and 700
It is secondary.Test result is as shown in the table:
Table 1: the true charge and discharge test result of Stacked lithium ion battery diaphragm
Simulate charge and discharge test example
Comparative example of this simulation charge and discharge test example as above-mentioned true charge and discharge test example.In stacked lithium of the invention
In ion battery diaphragm simulation on Mechanical test macro, operated according to aforesaid operations method.Specific operating parameter is such as
Under:
Diaphragm soaking time: lithium-ion battery electrolytes are soaked in 2 hours；
The rectangle diaphragm sample size determined: 200mm × 359mm；
Heating temperature: being respectively 60 DEG C, 70 DEG C, 80 DEG C, 90 DEG C, 100 DEG C, 110 DEG C and 120 DEG C；
Diaphragm initial tension: 3N；
Tensile strain rate: 3%；
Rate of extension: 2%/min；
It stretches cycle-index: being respectively 100,200,300,400,500,600 and 700 times；
Mechanical test temperature: room temperature.
Test result is as shown in the table:
Table 2: Stacked lithium ion battery diaphragm simulates charge and discharge test result
The comparison of tensile strength values and elastic mould value in Tables 1 and 2 is shown in Fig. 2.It can be seen that stacked
Lithium ion battery separator simulates charge and discharge test under the conditions of identical temperature and cycle-index, test result and stacked lithium from
The sub- true charge and discharge test result of battery diaphragm is close, shows tensile strength values and elastic mould value is close, and diaphragm appearance
Also close.Therefore, Stacked lithium ion battery diaphragm simulation on Mechanical test macro of the invention can simulation layer well
Stacked lithium ion battery separator passes through the tensile strength and elasticity modulus of charge and discharge cycles metacneme under the conditions of true charge and discharge.
The description of this invention above for illustration purposes only, is not meant to the model limiting the invention in any way
It encloses.Under the introduction of spirit of the invention, those skilled in the art can make under the premise without departing from the essence of the invention
Many modifications and equivalent program.These modifications and equivalent program each fall within right as long as not conflicting with the prior art
In the scope of the present invention that claim is covered.
Claims (9)
1. a kind of Stacked lithium ion battery diaphragm simulation on Mechanical test macro, including battery charging and discharging simulator and survey
Examination control and data processing equipment, the battery charging and discharging simulator include heating test section, heater, temperature controller, diaphragm
Fixture, screw rod, drawing mechanism and tension sensor, the battery charging and discharging simulator and the testing and control and data processing
Device forms signal connection；
The heating test section is used to carry out heating temperature to battery diaphragm and ess-strain is simulated；
The heater is detected by the temperature controller and is controlled described for heating to the heating test section
Heat the temperature of test section；
Diaphragm is fixed on the heating test section for clamping diaphragm by the septum clip；
The drawing mechanism is stretched through diaphragm of the screw rod to clamping, simulates ess-strain, also, pass through the drawing
Force snesor detects and controls the tensile strength of drawing mechanism；
The testing and control is connect with data processing equipment with the temperature controller and the drawing mechanism signal, to acquire diaphragm
The data of heating temperature and ess-strain simulation.
2. Stacked lithium ion battery diaphragm simulation on Mechanical test macro according to claim 1, which is characterized in that
The testing and control and data processing equipment include programmable logic controller (PLC) and data acquisition output device, the battery charge and discharge
Electric copying device and the programmable logic controller (PLC) and data acquisition output device formation are electrically connected, and described are compiled
Journey logic controller is electrically connected with data acquisition output device formation.
3. Stacked lithium ion battery diaphragm simulation on Mechanical test macro according to claim 1, which is characterized in that
The testing and control and data processing equipment are computer installation, the battery charging and discharging simulator and the computer installation
Form electrical connection.
4. Stacked lithium ion battery diaphragm simulation on Mechanical test macro according to any one of claim 1-3,
It is characterized in that, heater, septum clip and the screw rod of the battery charging and discharging simulator are located at the battery charging and discharging mould
In the heating test section of quasi- device, temperature controller, drawing mechanism and the tension sensor of the battery charging and discharging simulator are located at
Outside the heating test section of the battery charging and discharging simulator.
5. Stacked lithium ion battery diaphragm simulation on Mechanical test macro according to claim 4, which is characterized in that
The septum clip includes the first septum clip and the second septum clip, and lithium ion battery separator sample to be tested passes through first
Septum clip and the second septum clip are fixed in the heating test section.
6. Stacked lithium ion battery diaphragm simulation on Mechanical test macro according to claim 5, which is characterized in that
The temperature controller of the battery charging and discharging simulator and the testing and control are electrically connected with data processing equipment formation, and with it is described
Heater forms electrical connection.
7. Stacked lithium ion battery diaphragm simulation on Mechanical test macro according to claim 5, which is characterized in that
The drawing mechanism of the battery charging and discharging simulator is located at the lower section of the heating test section, and passes through the screw rod and second
Septum clip forms mechanical connection, and is electrically connected with the testing and control with data processing equipment formation.
8. Stacked lithium ion battery diaphragm simulation on Mechanical test macro according to claim 7, which is characterized in that
The drawing mechanism is servo motor or stepper motor.
9. Stacked lithium ion battery diaphragm simulation on Mechanical test macro according to claim 5, which is characterized in that
The tension sensor of the battery charging and discharging simulator be located at it is described heating test section top, and with the first septum clip shape
It is electrically connected at mechanical connection, and with the testing and control with data processing equipment formation.
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| CN201711484990.0A CN108279161B (en) | 2017-12-29 | 2017-12-29 | Stacked lithium ion battery diaphragm simulation on Mechanical test macro |
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| CN201711484990.0A CN108279161B (en) | 2017-12-29 | 2017-12-29 | Stacked lithium ion battery diaphragm simulation on Mechanical test macro |
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| CN108279161B true CN108279161B (en) | 2019-05-03 |
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| CN112611634B (en) * | 2020-12-18 | 2023-05-16 | 联动天翼新能源有限公司 | Method for evaluating pole piece fracture at positive lug of cylindrical lithium battery |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102196900A (en) * | 2008-10-24 | 2011-09-21 | 东丽东燃机能膜合同会社 | Multi-layer microporous membranes and methods for making and using such membranes |
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| US20150323435A1 (en) * | 2014-05-12 | 2015-11-12 | Steven Slupsky | Containment integrity sensor device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102196900A (en) * | 2008-10-24 | 2011-09-21 | 东丽东燃机能膜合同会社 | Multi-layer microporous membranes and methods for making and using such membranes |
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