CN104849403B - Method for monitoring expansion of lithium ion battery - Google Patents
Method for monitoring expansion of lithium ion battery Download PDFInfo
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- CN104849403B CN104849403B CN201510192192.5A CN201510192192A CN104849403B CN 104849403 B CN104849403 B CN 104849403B CN 201510192192 A CN201510192192 A CN 201510192192A CN 104849403 B CN104849403 B CN 104849403B
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Abstract
The application relates to the field of clean energy, in particular to a method for monitoring expansion of a lithium ion battery. Comprises the following steps: monitoring the force application change of a cell shell of the lithium ion battery to the outside due to expansion and the gas stress change in the cell shell; analyzing the force application change of the cell shell to the outside due to expansion and the stress change of the internal gas to obtain the force application change of the cell shell due to electrode expansion. The method for monitoring the expansion of the lithium ion battery provided by the embodiment of the application can obtain the force application change of the battery cell shell to the outside due to the expansion and the gas stress change inside the battery cell shell, and accurately represent the electrode expansion degree of the lithium ion battery in the using process through the two sets of data.
Description
Technical field
The application relates to clean energy resource field, monitors, in particular to a kind of, the method that lithium ion battery expands.
Background technology
Since lithium ion battery realizes commercialization, lithium ion battery because of its light weight, voltage is high, volume is little, memoryless
The plurality of advantages such as effect, specific energy are high, have extended cycle life, environmental friendliness, rapidly at Portable power source, mobile phone, pen
Remember that this computer, photographing unit and other portable type electronic product fields constantly expand popularization and application.Consumption along with fossil energy
Exhausting, and worldwide pollution is aggravated, people are more and more higher to the cry of clean energy resource, so that lithium ion battery is fast
Speed captures this critical positions of fossil energy.
Through studying discovery for a long period of time, lithium ion battery is in use it may happen that expand, and expansion issues can be to lithium
The safety problem of ion battery causes large effect, and also can affect the cycle life of battery core.
Therefore, how to monitor and expand relevant parameter to lithium ion battery, carry out with the expansion process to lithium ion battery
Research, is those skilled in the art's urgent problems.
Summary of the invention
This application provides a kind of method monitoring lithium ion battery expansion, it is possible to monitoring and lithium ion battery expansion process
Relevant parameter.
A kind of method monitoring lithium ion battery expansion provided according to the embodiment of the present application, comprises the following steps:
Monitor the battery core housing of described lithium ion battery because expanding in force change to external world and described electric core shell body
The gas stress change in portion；
Analyze described battery core housing to change and the change of internal gas stress because of the force expanded to external world, obtain because of electrode
Expand the force to described battery core housing to change.
In above-mentioned method,
Monitor the described battery core housing of described lithium ion battery and include because of the step expanding force change to external world: monitoring
The expansion pressure P that the unit are of described battery core housing is applied to external world because of expansion1；
The step of the gas stress change monitoring described battery core enclosure interior includes: monitor the gas of described battery core enclosure interior
Body pressure P2；
Analyze described battery core housing to change and the stress change of internal gas because of the force expanded to external world, obtain because of electricity
Pole expands the step of the change that exerts a force described battery core housing and comprises determining that because electrode expansion puts on the swollen of described battery core housing
The strong P of swelling pressure3For P1-P2。
In above-mentioned method, described battery core housing at least has one can plane of deformation；Monitor the list of described battery core housing
The long-pending expansion pressure P applied to external world because of expansion of plane1Step include:
To can the deformability in deformation face limit on described battery core housing so that it is only having one can deform upon
Can plane of deformation；
The locomotivity of described battery core housing is limited；
Monitoring is described can expand pressure F produced by deformation by plane of deformation1；
Obtain described can the surface area S of plane of deformation1；
Determine expansion pressure P1For F1/S1。
In above-mentioned method, described battery core housing can only include that relative two can plane of deformation in deformation face；
Movement and deformability to the surface of described battery core housing limit so that it is only having one can plane of deformation
Step include:
One of described battery core housing can plane of deformation and one piece of obstacle being made up of rigid material be fitted completely, will
Another of described battery core housing can be fitted with the obstacle that another block is made up of rigid material by plane of deformation completely；
Limit the locomotivity of one of described obstacle；
The thrust of the described battery core housing that monitoring is not subject to by the described obstacle limiting locomotivity, is defined as F1。
In above-mentioned method, described battery core housing has can not deformation face；
Monitor the gas pressure intensity P of described battery core enclosure interior2Step include: from described battery core housing can not deformation face
Monitor the gas pressure intensity P of described battery core enclosure interior2。
In above-mentioned method, monitor the gas pressure intensity P of described battery core enclosure interior2Step after also include:
Extract the portion gas of described battery core enclosure interior；
The volume V of the gas of described extraction is measured with battery core enclosure interior when connecting2, temperature T2And gas
Pressure P4；
The volume V of produced internal gas3For P4V2/(P2-P4)；
Amount n of the material of produced internal gas2For P2V3/RT2；
Wherein, R is ideal gas constant.
In above-mentioned method, described battery core housing has can not deformation face；
The step of the gas of described extraction battery core enclosure interior includes: from described battery core housing can not deformation face extract institute
State the gas of battery core enclosure interior.
In above-mentioned method, described battery core housing have can not deformation face, described can not be provided with at a collection in deformation face；
Monitor the gas pressure intensity P of described battery core enclosure interior2Step and the gas of described extraction battery core enclosure interior
Step all carry out at described collection.
In above-mentioned method, also include:
Analyze the composition of the gas of described extraction.
In above-mentioned method, one of following method is at least used to analyze the composition of gas of described extraction:
Gas chromatography, mass spectrography, spectra methods, nuclear magnetic resonance spectroscopy method, GC-MS analytical method.
The technical scheme that embodiments herein provides can include following beneficial effect:
The method that the monitoring lithium ion battery that the embodiment of the present application is provided expands is obtained in that battery core housing is right because expanding
Extraneous force change, the gas stress of the inside of battery core housing change, and by these two groups of data accurate characterization lithium-ion electrics
The degree of electrode expansion during the use of pond.
It should be appreciated that it is only exemplary that above general description and details hereinafter describe, can not be limited this
Application.
Accompanying drawing explanation
The flow chart of the method that the monitoring lithium ion battery that Fig. 1-3 is provided by the embodiment of the present application expands.
The overall structure schematic diagram of the system that the monitoring lithium ion battery that Fig. 4 is provided by the embodiment of the present application expands.
Accompanying drawing illustrates: 10-battery core housing；100,102-can not deformation face；12-inspection of inner pressure device；14-external pressure monitoring dress
Put；16-collection and confinement of gases mouth；18-one-way control valve；20-gas volume measurement apparatus；22-tee T；The intrinsic pressure test of 24-connects
Pipe；26-moves and deformation limiter assembly；260-may move obstacle；262a, 262b-constant resistance thing；28-external pressure data turn
Parallel operation；The intrinsic pressure data converter of 30-.
Accompanying drawing herein is merged in description and constitutes the part of this specification, it is shown that meet the enforcement of the application
Example, and for explaining the principle of the application together with description.
Detailed description of the invention
Below by specific embodiment and combine accompanying drawing the application is described in further detail.
Embodiments herein provides a kind of method monitoring lithium ion battery expansion, as it is shown in figure 1, include following step
Rapid:
Step 10: monitor the battery core housing of described lithium ion battery because expanding force change to external world and described battery core
The gas stress change of enclosure interior；
Step 20: analyze described battery core housing and change and the change of internal gas stress because of the force expanded to external world, obtain
To because of electrode expansion, the force of described battery core housing is changed.
Applicant analyzes, and according to stress balance principle, battery core housing changes and suffered by it because of the force expanded to external world
Internal expansion pressure be equal.In like manner, the stress change of internal gas the most also puts on battery core housing with internal gas
Force change consistent.Applicant analyzes further, and the internal expansion pressure suffered by battery core housing is from internal gas and electricity
Core expands two aspects, therefore, just existence function relation between three, by battery core housing because of expand force change to external world with
And gas in the inside of battery core housing gas stress change just can accurate characterization lithium ion battery use during electrode swollen
Swollen degree.The method is obtained in that battery core housing is subject to because of the gas expanding the inside of exert a force change, battery core housing to external world
Power changes, thus has monitored and expanded relevant parameter to lithium ion battery, and then can be to the expansion process of lithium ion battery
Study.
Wherein, the battery core housing of described lithium ion battery is monitored because expanding step and the monitoring institute of force change to external world
The step of the gas stress change stating battery core enclosure interior can be carried out in any order, it is possible to carry out simultaneously.
Stress object due to active force includes the material of multiple phase, therefore, in order to accurately weigh these power
Change, in embodiments herein,
Monitor the described battery core housing of described lithium ion battery and include because of the step expanding force change to external world: monitoring
The expansion pressure P that the unit are of described battery core housing is applied to external world because of expansion1；
The step of the gas stress change monitoring described battery core enclosure interior includes: monitor the gas of described battery core enclosure interior
Body pressure P2；
Analyze described battery core housing to change and the stress change of internal gas because of the force expanded to external world, obtain because of electricity
Pole expands the step of the change that exerts a force described battery core housing and comprises determining that because electrode expansion puts on the swollen of described battery core housing
The strong P of swelling pressure3For P1-P2。
Pressure can be by unit of force, therefore, it is possible to accurately weigh the relation between power and stress object, in order to
The stressing conditions of each monitoring object can be analyzed, compares.Pressure P is expanded in monitoring1Time, can directly monitor battery core
The expansion pressure P that body unit area applies to external world because of expansion1, it would however also be possible to employ following steps obtain, as shown in Figure 2:
Step: 100: to can the deformability in deformation face limit on described battery core housing so that it is only have one
Can deform upon can plane of deformation；
Step 110: the locomotivity of described battery core housing is limited；
Step 120: monitoring is described can expand pressure F produced by deformation by plane of deformation1；
Step 130: obtain described can the surface area S of plane of deformation1；
Step 140: determine expansion pressure P1For F1/S1。
There are a lot of outer surfaces in battery core housing, owing to surface area is less, or is provided with ruggedized construction etc., and some face exists
Substantially without producing deformation under the conditions of internal force, referred to as can not deformation face by this in the application.And on battery core housing also
There is surface area relatively big, self be susceptible to the face of deformation, referred to as can deformation face by this in the application.Wherein, can deformation
The shape in face can be arcuation or plane, in the application by plane can deformation face referred to as can plane of deformation.
Can the deformability in deformation face by limiting major part, it is possible to make the pressure of battery core enclosure interior all concentrate on remaining
Under one can discharge on plane of deformation, therefore monitoring this can expand pressure produced by deformation and just can obtain by plane of deformation
The inside of battery core housing is exerted by the whole pressure on battery core housing.Afterwards in conjunction with this can the area of plane of deformation, just may be used
Its pressure values is obtained by force equation F=PS.At present, it is possible to measure pressure technical equipment the most highly developed, and
Compared with the device utilizing the principle such as ultrasound wave, optics can directly monitor pressure, the cost of device for measuring force is the lowest.
During monitoring, owing to its face monitored the most all can be applied while monitoring by existing device for measuring force
One counteracting force, therefore monitor some can deformation face time, if the locomotivity of battery core housing is not limited, then
Along with the carrying out of expansion process, battery core housing is likely to by the way of the direction contrary to side, device for measuring force place is moved unload
Carry the counteracting force that device for measuring force is applied.So, although battery core housing is at prolonged expansion, but the prison that device for measuring force is obtained
Survey data, without producing great changes, the most also would not obtain monitoring result accurately.So, carrying out above-mentioned steps
Time, in addition it is also necessary to the locomotivity of battery core housing is limited so that it is device for measuring force institute cannot be uninstalled by the way of mobile
The power applied.
At present, a lot of lithium ion batteries, such as battery of mobile phone, its battery core housing is all fabricated to lamellar, and its three couple is relative
Face has two to for can not deformation face, the maximum face of remaining a pair area is can plane of deformation.For this architectural characteristic, this
Application embodiment provides a kind of relatively simple movement implementing the surface to described battery core housing and deformability limits
System so that it is only having one can the technical scheme of step of plane of deformation:
One of described battery core housing can plane of deformation and one piece of obstacle being made up of rigid material be fitted completely, will
Another of described battery core housing can be fitted with the obstacle that another block is made up of rigid material by plane of deformation completely；
Limit the locomotivity of one of described obstacle；
The thrust of the described battery core housing that monitoring is not subject to by the described obstacle limiting locomotivity, is defined as F1。
Use said method when being monitored, with fitted completely by the obstacle limiting locomotivity can plane of deformation
Locomotivity and deformability all can be entirely limited by this obstacle.And why can paste completely with obstacle by plane of deformation
Close, be due to obstacle to be ensured can limit can the deformation of all positions and locomotivity on plane of deformation.
Same, with not by the obstacle limiting locomotivity fit completely can plane of deformation, each position thereon
Expansion deformation all this obstacle can be produced active force, and promote it to move.
Carrying out P2Monitoring time, owing to needing that the gas of inspection of inner pressure device and battery core enclosure interior is produced interaction,
Inspection of inner pressure device just can be made to obtain desired data.Therefore it is typically necessary and on battery core housing, offers one for gas or interior
The hole that pressure monitoring device is interactive.
If inspection of inner pressure device can carry out monitoring on deformation face at one, if this can deformation face for monitoring
Monitoring surface, then inspection of inner pressure device needs to be operated in same face with device for measuring force, so can increase answering of device structure
Miscellaneous degree or the order of accuarcy of reduction monitoring result.If this can be limited the non-monitored face of deformation, the most intrinsic pressure prison in deformation face
Survey device need with limit this can the equipment of plane of deformation deformability same work, so can increase device structure
Complexity or reduce to this can the restriction effect of plane of deformation deformability, the order of accuarcy of testing result can be reduced equally.
And if from battery core housing can not deformation face monitoring battery core enclosure interior gas pressure intensity P2, then can avoid
State problem.
At present, universal along with computer, the record of data, calculate, analysis process the most all can pass through computer
Realize, therefore, monitor F using said method1Its numerical value can be converted into computer discernible data afterwards, and transmit
To computer；Obtaining surface area S1After, S1Numerical value can also convert into the discernible data of computer, and transmit to computer；
Afterwards, just P can be completed by computer1Calculating.
Same, calculating P3Time, it is also possible to the P that will be obtained before1And P2It is converted into the discernible number of computer
According to, and transmit to computer, afterwards, just P can be completed by computer3Calculating.
Wherein, data conversion process individually can be carried out after parameter acquiring, or carry out with other step simultaneously, as long as
Complete just may be used before carrying out result calculating.
When studying the expansion process of lithium ion battery, produced gas flow is also a critically important parameter, passes through
It is monitored, the data with this relating to parameters of can deriving, and studies inside lithium ion cell composition possibly through it
The produced impact of expansion process of group battery pair.Therefore, as it is shown on figure 3, in the method that the embodiment of the present application is provided
May also include the following step:
Step 30: extract the portion gas of described battery core enclosure interior；
Step 40: measure the volume V of the gas of described extraction with battery core enclosure interior when connecting2, temperature T2With
And gas pressure intensity P4。
Step 50: the volume V of produced internal gas3For P4V2/(P2-P4)；
Step 60: amount n of the material of produced internal gas2For P2V3/RT2。
Wherein, R is ideal gas constant.
Owing to the amount of the material of battery core enclosure interior gas is constant, and the volume of battery core enclosure interior is the most constant, and temperature
Degree change is small, it is believed that when carrying out pressure monitoring, the temperature of gas is T2, therefore P2V3=P4 (V3+V2), derive and just draw
The volume V of produced internal gas3For P4V2/(P2-P4)；The most just the amount of the material of institute's aerogenesis body can be obtained.The extracted amount of gas
Can select according to battery volume, certainty of measurement and detecting instrument sensitivity etc., such as, extract 1ml gas.
It should be noted that the step of the gas extracting battery core enclosure interior needs monitoring described battery core enclosure interior
Gas pressure intensity P2Step complete after carry out again.If reverse order, first extract the gas of battery core enclosure interior, then can cause
Monitor the gas pressure intensity P of described battery core enclosure interior2Step cannot proceed.
Same, calculating n2Time, it is also possible to the volume V that will be obtained2, temperature T2And P4Numerical value be converted into calculating
The discernible data of machine, and transmit to computer, afterwards, just n can be completed by computer2Calculating.
Wherein, data conversion process individually can be carried out after parameter acquiring, or carry out with other step simultaneously, as long as
Complete just may be used before carrying out result calculating.
Same, the gas needing battery core enclosure interior owing to extracting the step of gas can be through the somewhere of battery core housing
And be collected.If can other operating process can be counteracted by deformation face extraction gas by battery core housing.Therefore, in order to keep away
Exempt from the problems referred to above, can select by battery core housing can not deformation face extract described battery core enclosure interior gas.
In order to reduce the damage to battery core shell structure, enable monitored lithium ion battery to be more nearly and make really
By process, therefore the gas pressure intensity P of described battery core enclosure interior can will be monitored2Step and described extraction electric core shell body in
The step of the gas in portion is all carried out at same described collection.
During cell expansion, different gas is due to the difference of its physicochemical property being had, and therefore it is to electricity
The impact that pond expansion process is caused is the most different.Under this change, know that the composition of battery core internal gas can help
The expansion process of the research lithium ion battery that Yu research worker is the most careful.Therefore, described battery core enclosure interior can extracted
The composition of the gas of described extraction is analyzed again after gas.
In the embodiment of the present application, gas chromatography, mass spectrography, spectra methods, nuclear magnetic resonance spectroscopy method, color can be used
Matter combination analysis methods etc. analyze the composition of the gas of described extraction.
In order to the method implementing the monitoring lithium ion battery expansion that the embodiment of the present application is provided, the embodiment of the present application
In additionally provide a set of lithium ion battery expansion process monitoring system.As it is shown in figure 1,
Including battery core housing 10, inspection of inner pressure device 12 and external pressure monitoring device 14；
Inspection of inner pressure device 12 communicates with the inside of battery core housing 10, and the gas of the inside for monitoring battery core housing 10 is subject to
Power changes；
External pressure monitoring device 14 is arranged on the side of battery core housing 10, for monitoring battery core housing 10 because expanding to external world
Force change.
This system can monitor the interior of battery core housing 10 respectively by inspection of inner pressure device 12 and external pressure monitoring device 14
The gas stress in portion changes and because expanding force change to external world.Multinomial and the cell expansion mistake obtained by this system
The physicochemical data of Cheng Xiangguan, it is possible in use it is swollen with analyzing lithium ion battery to make the more deep understanding of research worker
Swollen process and the relation of these factors, contribute to improving the cycle life of lithium ion battery and safety problem.
When battery core housing 10 include multiple can deformation face, and multiple can in deformation face at least one be can plane of deformation
When 102, just can by limit major part can the deformability in deformation face, it is possible to make the pressure within battery core housing 10 all concentrate
Can discharge on plane of deformation 102 at remaining one, therefore monitoring this can expand pressure produced by deformation by plane of deformation
Just whole pressure that the inside of battery core housing 10 is exerted by battery core housing 10 can be obtained.Afterwards can plane of deformation in conjunction with this
The area of 102, just can obtain its pressure values by force equation F=PS.Adopting when being monitored in this way, external pressure is monitored
Device 14 can directly select the device for measuring force that can measure external force.In correlation technique, device for measuring force becomes the most very much
Ripe, and compared with the device utilizing the principle such as ultrasound wave, optics can directly monitor pressure, the cost of device for measuring force is the lowest.
During monitoring, owing to its face monitored the most all can be applied while monitoring by existing device for measuring force
One counteracting force, therefore monitor some can plane of deformation 102 time, if the locomotivity of battery core housing 10 is not carried out
Limit, then along with the carrying out of expansion process, battery core housing 10 is likely to be moved by the direction contrary to side, device for measuring force place
Dynamic mode uninstalls the counteracting force that device for measuring force is applied.So, although battery core housing 10 is at prolonged expansion, but dynamometry fills
Put obtained Monitoring Data without produce great changes, the most also would not obtain monitoring result accurately.So, entering
During row above-mentioned steps, in addition it is also necessary to the locomotivity of battery core housing is limited so that it is cannot uninstall by the way of mobile
The power that device for measuring force is applied.
Therefore, in order to make the pressure within battery core housing 10 all concentrate on remaining one can plane of deformation 102
On discharge, and by device for measuring force, the size of power is monitored, embodiments herein provides a set of movement and shape
Become limiter assembly 26 limit the movement of battery core housing 10 and other can the deformation in deformation face, mobile with deformation limiter assembly 26
The position of battery core housing 10 is fixed；
External pressure monitoring device 14 monitors one can plane of deformation 102；And the multiple of battery core housing 10 can be in deformation face, except quilt
All can fitting with deformation limiter assembly 26 with mobile outside plane of deformation 102 of monitoring, and by movement and deformation limiter assembly 26
Limit its deformability.
Mobile can have various structures to realize with deformation limiter assembly 26, such as, by rigid material plate sheet welding one and
The matching size of battery core housing 10 closes and the casing of a side opening, is placed in casing by battery core housing 10, makes battery core housing 10
One can be exposed by the opening of casing by plane of deformation 102, the most again this casing is fixed, just can realize limit battery core housing 10
Mobile and other can the function of deformation in deformation face.
At present, a lot of lithium ion batteries, such as battery of mobile phone, its battery core housing is all fabricated to lamellar, and its three couple is relative
Face has two to for can not deformation face 100, the maximum face of remaining a pair area is can plane of deformation 102.For this structure
Characteristic, the embodiment of the present application provides the relatively simple movement of a kind of structure and deformation limiter assembly 26.It includes that one piece can be moved
Dynamic obstacle 260 and at least one piece of constant resistance thing；Battery core housing 10 is in one piece of constant resistance thing and removable stop
Between thing 260, and two can in plane of deformation 102 one be fitted with removable obstacle 260 completely, can deformation put down for two
Another in face 102 is fitted completely with constant resistance thing；
Constant resistance thing and removable obstacle 260 are rigid material and make, and the position of constant resistance thing is all the time
Holding immobilizes；
External pressure monitoring device 14 is arranged on the removable obstacle 260 side away from battery core housing 10, and monitors removable
What obstacle 260 was subject to fit with it can the thrust of plane of deformation 102.
Employing rigid material makes constant resistance thing and ensure that their shape keeps fixing, coordinates its holding to fix
Position just can make with the laminating of this constant resistance thing can keep the fixing of shape and position by plane of deformation 102.
And may move obstacle 260 and be also adopted by rigid material so that it is can not deform upon, all the time with external pressure monitoring device
14 well coordinate, so that external pressure monitoring device 14 obtains data more accurately.
Here, owing to ensure that all expansive forces of monitored all can be captured by external pressure monitoring device 14, therefore
To fit completely with removable obstacle 260 for monitored so that it is all of expansion deformation all can act on removable stop
On thing 260.
Having a variety of for measuring the device of external force, wherein weighing type pressure transducer belongs to relatively simple one, becomes
This is the cheapest.Due to the restriction of himself structure, its side to be kept during carrying out dynamometry maintains static, another
Side along with external force increase and gradually to the side compression fixed, thus obtain measurement result.
Therefore, to use this sensor as external pressure monitoring device 14, just need to fix its side.The application
A kind of relatively simple mode is provided.Two pieces of constant resistance thing 262a and 262b are set；And constant resistance thing 262a hinders with fixing
Block material 262b is oppositely arranged；Removable obstacle 260 is between constant resistance thing 262a and constant resistance thing 262b；
External pressure monitoring device 14 is between constant resistance thing 262a and mobile obstacle 260；
Battery core housing 10 is between constant resistance thing 262b and mobile obstacle 260；
Constant resistance thing 262a and constant resistance thing 262b is fixing to be connected.
So, just can constitute a fixture by two pieces of constant resistance things 262, by external pressure monitoring device 14, removable resistance
Block material 260 and battery core housing 10 are clipped in wherein.Therefore its side that can meet heavy pressure transducer is fixed, and again can simultaneously
The side that battery core housing 10 deviates from monitored is fixed.
Removable obstacle 260 and constant resistance thing 262 are preferably arranged to lamellar, reduce deadweight, and save sky
Between.
This system is additionally provided with a collection and confinement of gases mouth 16；The inside of battery core housing 10 connects with collection and confinement of gases mouth 16.This
Sample, just can gather the gas within battery core housing 10 by collection and confinement of gases mouth 16, and use such as gas chromatograph, mass spectrograph,
Its composition is analyzed by the analysis means such as spectroanalysis instrument, nuclear magnetic resonance analyser, GC-MS method instrument.These analytical tool can
To be directly connected with collection and confinement of gases mouth 16, it is also possible to by gas collector, the gas collected is transferred to analytical equipment.
Owing to air being likely to result in, containing oxygen, impurity etc., the material that lithium ion battery lost efficacy or damaged, cause monitoring
Process terminate, it is therefore desirable to connect an one-way control valve 18 at collection and confinement of gases mouth 16, one-way control valve 18 can at which in
During opening, unidirectional prevention extraneous gas enters into the inside of battery core housing 10 through collection and confinement of gases mouth 16.One-way control valve 18 can
Think a valve, it is also possible to form with a stop valve and a check valve.
Collection and confinement of gases mouth 16 connects gas volume measurement apparatus 20, to measure the internal produced gas of battery core housing 10
Volume.
Gas volume measurement apparatus 20 can be fixed on collection and confinement of gases mouth 16, it is also possible to detachable with collection and confinement of gases mouth 16
Connect, pulled down at ordinary times and deposit, be contained in again on collection and confinement of gases mouth 16 when gas volume measured by needs.
Owing to inspection of inner pressure device 12 needs when carrying out pressure monitoring to produce interaction with the gas within battery core housing 10,
Therefore it is typically necessary and on battery core housing 10, offers one for gas or the hole of inspection of inner pressure device 12 interaction.Meanwhile,
Collection and confinement of gases mouth 16 is also required to communicate with the inside of battery core housing 10.May if offering too much hole on battery core housing 10
The structural strength of its battery core housing 10 can be affected, and then test is caused certain impact, meanwhile, also can increase cost.Therefore, may be used
That reduces hole in the way of employing arranges tee T 22 offers quantity；In this case, three ends of tee T 22 are respectively
It is connected with the inside of inspection of inner pressure device 12, collection and confinement of gases mouth 16 and battery core housing 10；And one-way control valve 18 is arranged on
One end residing for collection and confinement of gases mouth 16.
The most just only a hole can be offered on battery core housing 10.When carrying out gas stress variation monitoring, Ke Yiguan
Close one-way control valve 18；And when gas collected by needs, just open one-way control valve 18 and carry out collection and confinement of gases operation.
In use, if tee T 22 be arranged on battery core housing 10 can on deformation face, if this can deformation face be for
Monitoring can plane of deformation 102, then tee T 22 may affect the operation of external pressure monitoring device 14, so can increase equipment knot
The complexity of structure or the order of accuarcy of reduction monitoring result.If this can be limited the non-monitored face of deformation, then in deformation face
Tee T 22 influence whether again mobile with deformation limiter assembly 26 in limit this can the part of plane of deformation deformability, so with
Sample can increase the complexity of device structure or reduce and the deformability of plane of deformation or battery core housing 10 can move this
Restriction effect, can reduce the order of accuarcy of testing result equally.
And can not both need not have an effect with external pressure monitoring device 14 in deformation face 100 on battery core housing 10, the most not with shifting
Move and have an effect with deformation limiter assembly 26.Can not be on deformation face 100 it is therefore preferable that tee T 22 is arranged on.
Inspection of inner pressure device 12 can use baroceptor, to monitor the pressure of gas.And owing to gas has flowing
Property, therefore inspection of inner pressure device 12 need not be extend in battery core housing 10, only need to be at inspection of inner pressure device 12 and tee T 22
Between an intrinsic pressure test connecting tube 24 is set, make inspection of inner pressure device 12 connect with the inside of battery core housing 10.
At present, universal along with computer, the record of data, calculate, analysis process the most all can pass through computer
Realize, therefore, it can external pressure monitoring device 14 and inspection of inner pressure device 12 are connected upper data converter, they are monitored
Result be converted to the discernible signal of computer.The parameter monitored due to external pressure monitoring device 14 and inspection of inner pressure device 12
Different, therefore can be respectively by external pressure data converter 28 and intrinsic pressure data converter 30 knot acquired to both
Fruit is changed respectively.
The foregoing is only the preferred embodiment of the application, be not limited to the application, for the skill of this area
For art personnel, the application can have various modifications and variations.All within spirit herein and principle, that is made any repaiies
Change, equivalent, improvement etc., within should be included in the protection domain of the application.
Claims (8)
1. monitor the method that lithium ion battery expands for one kind, it is characterised in that comprise the following steps:
Monitor the battery core housing of described lithium ion battery because expanding force change to external world and described battery core enclosure interior
Gas stress changes；
Analyze described battery core housing to change and the change of internal gas stress because of the force expanded to external world, obtain because of electrode expansion
The force of described battery core housing is changed；
Monitor the described battery core housing of described lithium ion battery and include because of the step expanding force change to external world: monitoring is described
The expansion pressure P that the unit are of battery core housing is applied to external world because of expansion1；
The step of the gas stress change monitoring described battery core enclosure interior includes: monitor the gas pressure of described battery core enclosure interior
Strong P2；
Analyze described battery core housing to change and the stress change of internal gas because of the force expanded to external world, obtain because electrode is swollen
The swollen step that described battery core housing exerts a force change comprises determining that because electrode expansion puts on the turgor pressure of described battery core housing
Strong P3For P1-P2；
Described battery core housing at least has one can plane of deformation；Monitor the unit are of described battery core housing because expanding to external world
The expansion pressure P applied1Step include:
To can the deformability in deformation face limit on described battery core housing so that it is only have one can deform upon can
Plane of deformation；
The locomotivity of described battery core housing is limited；
Monitoring is described can expand pressure F produced by deformation by plane of deformation1；
Obtain described can the surface area S of plane of deformation1；
Determine expansion pressure P1For F1/S1。
Method the most according to claim 1, it is characterised in that described battery core housing can only include relative two in deformation face
Individual can plane of deformation；
Movement and deformability to the surface of described battery core housing limit so that it is only having one can the step of plane of deformation
Suddenly include:
One of described battery core housing can plane of deformation and one piece of obstacle being made up of rigid material be fitted, by described completely
Another of battery core housing can be fitted with the obstacle that another block is made up of rigid material by plane of deformation completely；
Limit the locomotivity of one of described obstacle；
The thrust of the described battery core housing that monitoring is not subject to by the described obstacle limiting locomotivity, is defined as F1。
Method the most according to claim 1, it is characterised in that described battery core housing has can not deformation face；
Monitor the gas pressure intensity P of described battery core enclosure interior2Step include: from described battery core housing can not deformation face monitoring
The gas pressure intensity P of described battery core enclosure interior2。
Method the most according to claim 1, it is characterised in that monitor the gas pressure intensity P of described battery core enclosure interior2Step
Also include after rapid:
Extract the portion gas of described battery core enclosure interior；
The volume V of the gas of described extraction is measured with battery core enclosure interior when connecting2, temperature T2And gas pressure intensity
P4；
The volume V of produced internal gas3For P4V2/(P2-P4)；
Amount n of the material of produced internal gas2For P2V3/RT2；
Wherein, R is ideal gas constant.
Method the most according to claim 4, it is characterised in that described battery core housing has can not deformation face；
The step of the gas of described extraction battery core enclosure interior includes: from described battery core housing can not deformation face extract described electricity
The gas of core enclosure interior.
Method the most according to claim 4, it is characterised in that described battery core housing have can not deformation face, described can not
Deformation face is provided with at a collection；
Monitor the gas pressure intensity P of described battery core enclosure interior2Step and the step of gas of described extraction battery core enclosure interior
All carry out at described collection.
Method the most according to claim 4, it is characterised in that also include:
Analyze the composition of the gas of described extraction.
Method the most according to claim 7, it is characterised in that at least use one of following method to analyze the gas of described extraction
The composition of body:
Gas chromatography, mass spectrography, spectra methods, nuclear magnetic resonance spectroscopy method, GC-MS analytical method.
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| JP7165303B2 (en) * | 2019-03-08 | 2022-11-04 | トヨタ自動車株式会社 | Battery pack leak inspection method and leak inspection device |
| CN111426959B (en) * | 2019-09-30 | 2022-08-19 | 蜂巢能源科技有限公司 | Square cell circulating pressure prediction method |
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