CN107748329A - Charge states of lithium ion battery monitoring method, monitoring device and monitoring modular - Google Patents
Charge states of lithium ion battery monitoring method, monitoring device and monitoring modular Download PDFInfo
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- CN107748329A CN107748329A CN201710842065.4A CN201710842065A CN107748329A CN 107748329 A CN107748329 A CN 107748329A CN 201710842065 A CN201710842065 A CN 201710842065A CN 107748329 A CN107748329 A CN 107748329A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The present invention provides a kind of charge states of lithium ion battery monitoring method, comprises the following steps：Volume limiting device and pressure sensor, and cell pressure SOC characteristic curves are provided；Charge and discharge cycles are carried out to lithium ion battery to be measured, while are fixed value by the volume of the volume limiting device limitation lithium ion battery to be measured；Pass through the first pressure between the volume limiting device at the time point to be measured during the pressure sensor acquisition charge and discharge cycles and the lithium ion battery to be measured；And the first pressure is substituted into the cell pressure SOC characteristic curves, obtain the SOC value of the lithium ion battery to be measured at the time point to be measured.The present invention also provides a kind of charge states of lithium ion battery monitoring device and monitoring modular.
Description
Technical field
The present invention relates to lithium ion battery management domain, and in particular to a kind of state-of-charge to lithium ion battery is supervised
The method, apparatus and module of survey.
Background technology
The state-of-charge (State of Charge, SOC) that lithium ion battery residual capacity is also known as lithium ion battery be lithium from
One of important parameter of sub- battery status, foundation can be provided for the control management of electric automobile.Ensure that SOC maintains rational model
In enclosing, the damage for lithium ion battery of being rivals in a contest is prevented from overcharging or crossed, lithium ion battery utilization can be made more reasonable, improve lithium-ion electric
The service life in pond, the power performance of lithium-ion battery systems is given full play to, reduces what lithium-ion battery systems were safeguarded
Cost.
The strategy of lithium ion battery SOC estimations at present mainly has：It is discharge test method, open circuit voltage method, Ah counting method, fuzzy
Neural network and Kalman filtering method etc..These methods are required for measuring lithium ion battery battery pressure, are estimated by voltage
Calculate the residual capacity of lithium ion battery.Wherein discharge test method and open circuit voltage method can not be carried out to the lithium ion battery in work
SOC is monitored on-line, and the SOC estimation results of ampere-hour calculating method are generally not accurate enough, fuzzy neural network method and Kalman filtering method
Need that lithium ion battery data are analyzed and modeled, method is complex.The estimation precision reached needed for these methods is got over
Height, realize that difficulty is bigger, it is necessary to which the calculating carried out is more complicated, the requirement to lithium ion battery management system is also higher.
The content of the invention
Based on this, it is necessary to provide charge states of lithium ion battery monitoring side that is a kind of simple accurate and can using online
Method, monitoring device and monitoring modular.
A kind of charge states of lithium ion battery monitoring method, comprises the following steps：
Volume limiting device and pressure sensor, and cell pressure-SOC characteristic curves are provided；
Charge and discharge cycles are carried out to lithium ion battery to be measured, while the lithium to be measured is limited by the volume limiting device
The volume of ion battery is fixed value；
Pass through the volumetric constraint at the time point to be measured during the pressure sensor acquisition charge and discharge cycles
First pressure between device and the lithium ion battery to be measured；And
The first pressure is substituted into the cell pressure-SOC characteristic curves, the described of the time point to be measured is obtained and treats
Survey the SOC value of lithium ion battery.
In one of which embodiment, the volume limiting device is to the lithium ion battery along electrode slice stacked direction
On size limited.
In one of which embodiment, the volume limiting device includes at least one pressing plate, for by the lithium from
Sub- battery is fixed value along the size on the electrode slice stacked direction during charge and discharge cycles, and the pressure sensor is set
Put between the lithium ion battery and the pressing plate.
In one of which embodiment, the electrode slice of the lithium ion battery is stacked in the same direction, institute
It is tabular to state pressing plate, and the electrode slice and the pressing plate of the lithium ion battery be arranged in parallel；Or the lithium-ion electric
The electrode slice in pond is set for takeup type, forms cylinder-shaped lithium ion battery, and the pressing plate is cylindrical shape, is co-axially located at institute
State the periphery of lithium ion battery.
In one of which embodiment, the volume limiting device makes the lithium ion battery in the charge and discharge cycles
Preceding is by an initial pressure.
In one of which embodiment, the cell pressure-SOC characteristic curves are obtained by following steps：
Charge and discharge cycles are carried out to standard lithium ion battery, while the standard lithium is limited by the volume limiting device
The volume of ion battery is fixed value；
Pass through the volume limiting device at multiple time points during pressure sensor acquisition charge and discharge cycles
The SOC value of second pressure and the standard lithium ion battery between the standard lithium ion battery；And
It is fitted to obtain the battery pressure using the obtained second pressure and the SOC value of the standard lithium ion battery
Power-SOC characteristic curves.
In one of which embodiment, the standard lithium ion battery be the lithium ion battery to be measured in itself, or
There is same size and parameter with the lithium ion battery to be measured.
A kind of charge states of lithium ion battery monitoring device, including volume limiting device and pressure sensor, the volume
Limits device be used for limiting lithium ion cell volume, the pressure sensor be used for measure the volume limiting device with it is described
Pressure between lithium ion battery.
In one of which embodiment, the volume limiting device is to the lithium ion battery along electrode slice stacked direction
On size limited.
In one of which embodiment, in addition to monitoring modular and output module；
The monitoring modular includes pressure acquisition module, SOC computing modules and memory module；
The pressure acquisition module is used to obtain the number pressure between the volume limiting device and the lithium ion battery
According to, and it is sent to the SOC computing modules；
The memory module is used for storage battery pressure-SOC characteristic curves；
The SOC computing modules are used to read the cell pressure-SOC characteristic curves, and root from the memory module
Corresponding lithium ion battery SOC value is calculated according to the pressure data and the cell pressure-SOC characteristic curves；
The output module is used to export the lithium ion battery SOC value that the computing module obtains in real time.
A kind of charge states of lithium ion battery monitoring modular, including monitoring modular and output module；
The monitoring modular includes pressure acquisition module, SOC computing modules and memory module；
The pressure acquisition module is used for the pressure data for obtaining pressure sensor acquisition, and is sent to the SOC and calculates
Module；
The memory module is used for storage battery pressure-SOC characteristic curves；
The SOC computing modules are used to read the cell pressure-SOC characteristic curves, and root from the memory module
Corresponding lithium ion battery SOC value is calculated according to the pressure data and the cell pressure-SOC characteristic curves；
The output module is used to export the lithium ion battery SOC value that the computing module obtains in real time.
A kind of charge states of lithium ion battery monitoring method, comprises the following steps：
Displacement transducer and battery displacement-SOC characteristic curves are provided；
Charge and discharge cycles are carried out to lithium ion battery to be measured；
The lithium to be measured at the time point to be measured during obtaining the charge and discharge cycles by institute's displacement sensors
The surface of ion battery is because of the first displacement caused by Volume Changes；And
First displacement is substituted into battery displacement-SOC characteristic curves, obtains the lithium to be measured at the time point to be measured
The SOC value of ion battery.
In one of which embodiment, institute's displacement sensors are to the lithium ion battery along electrode slice stacked direction
Change in size measures.
In one of which embodiment, the battery displacement-SOC characteristic curves are obtained by following steps：
Charge and discharge cycles are carried out to standard lithium ion battery；
The standard lithium ion electricity at multiple time points during the charge and discharge cycles is obtained by displacement transducer
The surface in pond is because of second displacement caused by Volume Changes and the SOC value of the standard lithium ion battery；And
It is fitted to obtain the electricity using the obtained second displacement and the SOC value of the standard lithium ion battery
Pond displacement-SOC characteristic curves.
A kind of charge states of lithium ion battery monitoring modular, including monitoring modular and output module；
The monitoring modular includes displacement acquisition module, SOC computing modules and memory module；
The displacement acquisition module is used to obtaining the surface of the lithium ion battery because of displacement data caused by Volume Changes,
And it is sent to the SOC computing modules；
The memory module is used for storage battery displacement-SOC characteristic curves；
The SOC computing modules are used to read the battery displacement-SOC characteristic curves, and root from the memory module
Corresponding lithium ion battery SOC value is calculated according to the displacement data and the battery displacement-SOC characteristic curves；
The output module is used to export the lithium ion battery SOC value that the computing module obtains in real time.
A kind of charge states of lithium ion battery monitoring method, comprises the following steps：
Volume sensor and battery volume-SOC characteristic curves are provided；
Charge and discharge cycles are carried out to lithium ion battery to be measured；
The lithium to be measured at the time point to be measured during obtaining the charge and discharge cycles by the volume sensor
First volume of ion battery；And
First volume is substituted into battery volume-SOC characteristic curves, obtains the lithium to be measured at the time point to be measured
The SOC value of ion battery.
In one of which embodiment, the battery volume-SOC characteristic curves are obtained by following steps：
Charge and discharge cycles are carried out to standard lithium ion battery；
The standard lithium ion electricity at multiple time points during the charge and discharge cycles is obtained by volume sensor
The SOC value of second volume in pond and the standard lithium ion battery；And
It is fitted to obtain the electricity using obtained second volume and the SOC value of the standard lithium ion battery
Pond body product-SOC characteristic curves.
A kind of charge states of lithium ion battery monitoring modular, including monitoring modular and output module；
The monitoring modular includes position volume modulus block, SOC computing modules and memory module；
The volume acquisition module is used for the volume data for obtaining the lithium ion battery, and is sent to the SOC and calculates
Module；
The memory module is used for storage battery volume-SOC characteristic curves；
The SOC computing modules are used to read the battery volume-SOC characteristic curves, and root from the memory module
Corresponding lithium ion battery SOC value is calculated according to the volume data and the battery volume-SOC characteristic curves；
The output module is used to export the lithium ion battery SOC value that the computing module obtains in real time.
The present invention is by lithium ion battery Volume Changes or can reflect the parameters of lithium ion battery Volume Changes, such as pressure
Change or change in displacement, the foundation as SOC estimations.By to lithium ion battery Volume Changes, pressure change or change in displacement
Characteristic curve is pre-established with lithium ion battery SOC value.Lithium ion need not be measured in actual use in lithium ion battery
Cell voltage, real-time SOC monitorings can be achieved by monitoring Volume Changes, pressure change or change in displacement, have simple straight
The characteristics of connecing, lithium ion battery SOC value can be accurately monitored in real time, greatly simplify the complicated journey of battery management system
Degree.
Brief description of the drawings
Fig. 1 is the flow chart of the charge states of lithium ion battery monitoring method of first embodiment of the invention；
Fig. 2 is the structural representation of the charge states of lithium ion battery monitoring device of first embodiment of the invention；
Fig. 3 is the structural representation of the charge states of lithium ion battery monitoring device of another embodiment of the present invention；
Fig. 4 is the block diagram of the charge states of lithium ion battery monitoring modular of first embodiment of the invention；
Fig. 5 is that the test of lithium ion battery voltage and the second pressure in charge and discharge process of first embodiment of the invention is bent
Line；
Fig. 6 is to be fitted obtained cell pressure-SOC characteristic curves according to Fig. 5 voltage and second pressure；
Fig. 7 is the flow chart of the charge states of lithium ion battery monitoring method of second embodiment of the invention；
Fig. 8 is the structural representation of the charge states of lithium ion battery monitoring device of second embodiment of the invention；
Fig. 9 is the block diagram of the charge states of lithium ion battery monitoring modular of second embodiment of the invention；
Figure 10 is the flow chart of the charge states of lithium ion battery monitoring method of third embodiment of the invention；
Figure 11 is the block diagram of the charge states of lithium ion battery monitoring modular of third embodiment of the invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with drawings and Examples pair
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not
For limiting the present invention.
" state-of-charge " (SOC) mentioned in description of the invention, representative is that lithium ion battery uses a period of time institute
With electricity and lithium ion battery fully charged state when with electricity ratio, span is 0~1, works as SOC=0
When represent lithium-ion electric tank discharge it is complete, as SOC=1 represent lithium ion battery be completely filled with.
Fig. 1 and Fig. 2 is referred to, first embodiment of the invention provides a kind of charge states of lithium ion battery monitoring method, bag
Include：
S11, there is provided volume limiting device 10 and pressure sensor 20, and cell pressure-SOC characteristic curves；
S12, charge and discharge cycles are carried out to lithium ion battery 30 to be measured, while lithium to be measured is limited by volume limiting device 10
The volume of ion battery 30 is fixed value；
S13, pass through the volume limiting device 20 at the time point to be measured during the acquisition charge and discharge cycles of pressure sensor 20
With the first pressure between lithium ion battery 30 to be measured；And
S14, first pressure is substituted into cell pressure-SOC characteristic curves, obtains the lithium ion battery to be measured at time point to be measured
30 SOC value.
First embodiment of the invention also provides a kind of charge states of lithium ion battery monitoring device, including volume limiting device
10 and pressure sensor 20, volume limiting device 10 is used for the volume of limiting lithium ion cell, and pressure sensor 20 is used to measure
Pressure between volume limiting device 10 and lithium ion battery, lithium ion battery 30 can be lithium ion battery 30 to be measured or be used for
Establish the characteristic standard lithium ion batteries 30 of cell pressure-SOC.
In one embodiment, volume limiting device 10 includes at least one pressing plate 12, for lithium ion battery 30 to be filled
Size during discharge cycles at least one direction is fixed value.Pressure sensor 20 be arranged on lithium ion battery 30 with
Between pressing plate 12.Preferably, volume limiting device 10 includes two spaced pressing plates 12, the interval between two pressing plates 12
Distance is fixed value during charge and discharge cycles so that lithium ion battery 30 during charge and discharge cycles perpendicular to pressure
Size on the direction of plate 12 is fixed value.Volume limiting device 10 may also include side plate 14, be arranged between two pressing plates 12,
A cavity is collectively constituted with pressing plate 12, lithium ion battery 30 is arranged in cavity.Spacing distance between two pressing plates 12 can
To be adjusted by bolt, to adapt to various sizes of lithium ion battery 30, but the spacing distance is during charge and discharge cycles
Fixed.Volume limiting device 10 may also include equal plate 16, equal plate 16 be arranged on lithium ion battery 30 and pressure sensor 20 it
Between, a surface of equal plate 16 is bonded with the surface of lithium ion battery 30, for being uniformly distributed pressure.
Preferably, volume limiting device 10 is limited along the size on the stacked direction of electrode slice 32 lithium ion battery 30
System.For example, in the embodiment of fig. 2, the electrode slice 32 of lithium ion battery 30 is stacked in the same direction, pressing plate 12 is flat board
Shape, the electrode slice 32 of lithium ion battery 30 can be arranged in parallel with pressing plate 12 substantially.
Referring to Fig. 3, in another embodiment, the electrode slice 32 of lithium ion battery 30 is set for takeup type, forms cylinder
Shape lithium ion battery 30, the pressing plate 30 of volume limiting device 10 can be cylindrical shape, be co-axially located at the outer of lithium ion battery 30
Enclose.
Preferably, volume limiting device 10 makes lithium ion battery 30 before charge and discharge cycles i.e. by an initial pressure, pressure
Force snesor 20 is able to detect that pressure initial value, during charge and discharge cycles, the pressure with lithium ion battery 30 volume
Change and change.Preferably apply identical initial pressure for standard lithium ion battery 30 and lithium ion battery 30 to be measured.
First embodiment of the invention also provides a kind of charge states of lithium ion battery monitoring modular, including the He of monitoring modular 40
Output module 50.Referring to Fig. 4, in one embodiment, monitoring modular 40 includes pressure acquisition module 412, SOC computing modules
414 and memory module 416.Pressure acquisition module 412 is used to obtain the pressure between volume limiting device 10 and lithium ion battery 30
Force data, such as the pressure data of first pressure, and it is sent to SOC computing modules 414.Memory module 416 is used for storage battery
Pressure-SOC characteristic curves.SOC computing modules 414 are used to read cell pressure-SOC characteristic curves from memory module 416, and
The lithium ion battery SOC value according to corresponding to being calculated pressure data and cell pressure-SOC characteristic curves.Output module 50 is used
In the lithium ion battery SOC value that output computing module 414 obtains in real time.
The charge states of lithium ion battery monitoring device of first embodiment of the invention may also include the lithium ion battery lotus
Electricity condition monitoring modular.
First embodiment of the invention also provides a kind of characteristic method for building up of cell pressure-SOC, including：
S111, charge and discharge cycles are carried out to standard lithium ion battery 30, while pass through the limitation standard of volume limiting device 10
The volume of lithium ion battery 30 is fixed value；
S112, pass through the volume limiting device 10 at multiple time points during the acquisition charge and discharge cycles of pressure sensor 20
The SOC of second pressure and standard lithium ion battery 30 between standard lithium ion battery 30；And
S113, it is fitted to obtain cell pressure-SOC characteristic curves using obtained second pressure and SOC.
Standard lithium ion battery 30 can be lithium ion battery 30 to be measured itself, or have with lithium ion battery 30 to be measured
Variation characteristics of the identical SOC with lithium ion battery volume in charge and discharge process.For example, standard lithium ion battery 30 with it is to be measured
Lithium ion battery 30 can have same size and the lithium ion battery of parameter 30, such as lithium ion battery material, structure, appearance
At least one in amount and size is identical or all identical.In a preferred embodiment, standard lithium ion battery 30 is lithium to be measured
Ion battery 30 itself or the lithium ion battery 30 with the same batch same size of lithium ion battery 30 to be measured, lithium ion to be measured
Battery 30 first can establish battery pressure as standard lithium ion battery 30 after assembling is dispatched from the factory during a charge and discharge cycles
Power-SOC characteristic curves, the cell pressure-SOC characteristics established for the lithium ion battery 30 are used during subsequent use
Curve.
Preferably, standard lithium ion battery 30 uses identical volume limiting device 10, limit with lithium ion battery 30 to be measured
The volume of the standard lithium ion battery 30 of system and lithium ion battery 30 to be measured is identical fixed value.
In the charge and discharge cycles during establishing cell pressure-SOC characteristic curves and actual use to lithium ion to be measured
The charge and discharge cycles of battery 30, used discharge and recharge condition can be with identical or different, and preferably discharge and recharge condition is identical.Excellent
In the embodiment of choosing, standard lithium ion battery 30 is charged and discharged with lithium ion battery 30 to be measured by galvanostatic method, and is filled
Electric current is identical with discharge current difference.
In step S112, standard lithium ion 30 SOC value at multiple time points of battery can be obtained by existing method,
Such as the voltage and/or electric current of standard lithium ion battery 30 can be monitored in charge and discharge process, obtain multiple times
The voltage and/or electric current of point, pass through discharge test method, open circuit voltage method, Ah counting method, fuzzy neural network method or Kalman
Filter method etc. is estimated the SOC value of lithium ion battery 30.It is in lithium ion due to establishing cell pressure-SOC characteristic curves
Battery 30 actually uses preceding progress, and only needs to carry out once, therefore can be using accurate evaluation method as far as possible to lithium ion
The SOC value of battery 30 is estimated, makes cell pressure-SOC characteristic curves as far as possible accurate.
Cell pressure-SOC characteristic curves are the curve that change with SOC value of pressure that pressure sensor 20 obtains, pressure and
SOC value has temporal one-to-one relationship, and the characteristic ordinates of cell pressure-SOC are, for example, second pressure, horizontal seat
Mark is then the SOC of the standard lithium ion battery 30 at corresponding time point.In step S113, cell pressure-SOC characteristic curves can be with
Obtained by existing curve-fitting method, such as least square method or interpolation method etc..The quantity at multiple time points depends on song
The precision reached needed for line fitting, it is The more the better in the case where computing resource allows.
Lithium ion battery lithium ion insertion or abjection electrode active material in charge and discharge process, cause electrode slice 32 can
Inverse Volume Changes, found by studying, the Volume Changes have corresponding relation, lithium ion battery with lithium ion battery SOC value
In charging, volume increases, and volume reduces during electric discharge.First embodiment of the invention is caused by the volume of limiting lithium ion cell
Change of the lithium ion battery to external pressure, directly the pressure change can be monitored using pressure sensor 20, pass through electricity
Pond pressure-SOC characteristic curves can obtain corresponding lithium ion battery SOC value, that is, filling to lithium ion battery 30 to be measured
In discharge process, without carrying out SOC value estimation steps again, it is possible to achieve simple, effective, accurate SOC value on-line monitoring, greatly
The complexity and amount of calculation that simplify lithium ion battery management module.
Referring to Fig. 5, in one embodiment, the initial pressure applied by volume limiting device 10 to lithium ion battery 30
For 1kgf/cm2, constant current charge-discharge is carried out to lithium ion battery, while measure the voltage of lithium ion battery, it can be seen that lithium ion
The pressure that cell voltage and pressure sensor 20 measure has a temporal corresponding relation, and pressure increases during charging, presses during electric discharge
Power reduces, and reversible change during multiple charge and discharge cycles, it was demonstrated that using in the charge and discharge process of lithium ion battery 30
Volume Changes can reflect the SOC value of lithium ion battery at that time.Referring to Fig. 6, using the lithium ion battery voltage measured to lithium
Ion battery SOC value is estimated, can be fitted to obtain cell pressure-SOC characteristic curves.Utilize the cell pressure-SOC characteristics
Curve can obtain the lithium ion battery SOC value at time point to be measured by first pressure.
Fig. 7 and Fig. 8 is referred to, second embodiment of the invention provides a kind of charge states of lithium ion battery monitoring method, bag
Include：
S21, there is provided displacement transducer 60 and battery displacement-SOC characteristic curves；
S22, charge and discharge cycles are carried out to lithium ion battery 30 to be measured；
S22, the lithium-ion electric to be measured at the time point to be measured during obtaining charge and discharge cycles by displacement transducer 60
The surface in pond 30 is because of the first displacement caused by Volume Changes；And
S24, the first displacement is substituted into battery displacement-SOC characteristic curves, obtains the lithium ion battery to be measured at time point to be measured
30 SOC value.
The surface that displacement transducer 60 is used to measure lithium ion battery 30 is because of displacement caused by Volume Changes, lithium ion battery
30 can be lithium ion battery 30 to be measured or for establishing the characteristic standard lithium ion batteries 30 of battery displacement-SOC.It is preferred that
, displacement transducer 60 measures to change in size of the lithium ion battery 30 along the stacked direction of electrode slice 32.In an embodiment
In, the electrode slice 32 of lithium ion battery 30 is stacked in the same direction, and lithium ion battery 30 is on the stacked direction of electrode slice 30
With relative first surface and second surface, the position of first surface is fixed, such as may be provided in substrate 62, second surface
It can be moved freely in charge and discharge process, displacement transducer 60 is arranged on second surface, for sensing second surface in electrode
Displacement on the stacked direction of piece 30.
Second embodiment of the invention also provides a kind of charge states of lithium ion battery monitoring modular, including the He of monitoring modular 40
Output module 50.Referring to Fig. 9, in one embodiment, monitoring modular 40 includes displacement acquisition module 422, SOC computing modules
424 and memory module 426.The surface that displacement acquisition module 422 is used to obtain lithium ion battery 30 is because of position caused by Volume Changes
Data are moved, preferably obtain change in size of the lithium ion battery 30 along the stacked direction of electrode slice 32, and be sent to SOC computing modules
424.Memory module 426 is used for storage battery displacement-SOC characteristic curves.SOC computing modules 424 are used for from memory module 426
Battery displacement-SOC characteristic curves are read, and according to the displacement data of displacement data, e.g. the first displacement, and battery displacement-
Corresponding lithium ion battery SOC value is calculated in SOC characteristic curves.Output module 50 is used for output computing module 424 in real time and obtained
The lithium ion battery SOC value arrived.
The charge states of lithium ion battery monitoring device of second embodiment of the invention may also include the lithium ion battery lotus
Electricity condition monitoring modular.
Second embodiment of the invention also provides a kind of characteristic method for building up of battery displacement-SOC, including：
S121, charge and discharge cycles are carried out to standard lithium ion battery 30；
S122, pass through the standard lithium ion battery at multiple time points during the acquisition charge and discharge cycles of displacement transducer 60
30 surface is because of second displacement caused by Volume Changes and the SOC value of standard lithium ion battery 30；And
S123, it is fitted to obtain battery displacement-SOC characteristic curves using obtained second displacement and SOC value.
Second embodiment is essentially identical with first embodiment, distinguish in using lithium ion battery 30 in charge and discharge process
Surface caused by displacement reflection lithium ion battery 30 Volume Changes.
Referring to Fig. 10, third embodiment of the invention provides a kind of charge states of lithium ion battery monitoring method, including：
S31, there is provided volume sensor 70 and battery volume-SOC characteristic curves；
S32, charge and discharge cycles are carried out to lithium ion battery 30 to be measured；
S33, the lithium-ion electric to be measured at the time point to be measured during obtaining charge and discharge cycles by volume sensor 70
First volume in pond 30；And
S34, the first volume is substituted into battery volume-SOC characteristic curves, obtains the lithium ion battery to be measured at time point to be measured
30 SOC value.
Third embodiment of the invention also provides a kind of charge states of lithium ion battery monitoring modular, including the He of monitoring modular 40
Output module 50.Figure 11 is referred to, in one embodiment, monitoring modular 40 includes volume acquisition module 432, SOC computing modules
434 and memory module 436.Volume acquisition module 432 is used to obtain the volume data of lithium ion battery 30, and is sent to SOC calculating
Module 424.Memory module 426 is used for storage battery volume-SOC characteristic curves.SOC computing modules 424 are used for from memory module
Battery volume-SOC characteristic curves are read in 426, and are calculated according to lithium ion battery volume and battery volume-SOC characteristic curves
Lithium ion battery SOC value corresponding to obtaining.Output module 50 is used to export the lithium ion battery that computing module 424 obtains in real time
SOC value.
The charge states of lithium ion battery monitoring device of third embodiment of the invention may also include the lithium ion battery lotus
Electricity condition monitoring modular.
Third embodiment of the invention also provides a kind of characteristic method for building up of battery volume-SOC, including：
S121, charge and discharge cycles are carried out to standard lithium ion battery 30；
S122, pass through the standard lithium ion battery at multiple time points during the acquisition charge and discharge cycles of volume sensor 70
30 the second volume and the SOC value of standard lithium ion battery 30；And
S123, it is fitted to obtain battery volume-SOC characteristic curves using obtained the second volume and SOC value.
3rd embodiment is essentially identical with first embodiment, and difference is direct measurement lithium ion battery 30 in discharge and recharge
Volume Changes in journey.
Pressure sensor 20, displacement transducer 60 and volume sensor 70 can be existing sensings in above-described embodiment
Device, as long as can be measured to pressure, displacement and volume.
The embodiment of the present invention is by lithium ion battery Volume Changes or can reflect the parameters of lithium ion battery Volume Changes,
Such as pressure change or change in displacement, the foundation as SOC estimations.By to lithium ion battery Volume Changes, pressure change or position
Move change and pre-establish characteristic curve with lithium ion battery SOC value.In lithium ion battery in actual use without measurement
Lithium ion battery voltage, real-time SOC monitorings can be achieved by monitoring Volume Changes, pressure change or change in displacement, have
The characteristics of simple direct, lithium ion battery SOC value can be accurately monitored in real time, greatly simplify answering for battery management system
Miscellaneous degree.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (18)
1. a kind of charge states of lithium ion battery monitoring method, comprises the following steps：
Volume limiting device and pressure sensor, and cell pressure-SOC characteristic curves are provided；
Charge and discharge cycles are carried out to lithium ion battery to be measured, while the lithium ion to be measured is limited by the volume limiting device
The volume of battery is fixed value；
Pass through the volume limiting device at the time point to be measured during the pressure sensor acquisition charge and discharge cycles
With the first pressure between the lithium ion battery to be measured；And
The first pressure is substituted into the cell pressure-SOC characteristic curves, obtains the lithium to be measured at the time point to be measured
The SOC value of ion battery.
2. charge states of lithium ion battery monitoring method according to claim 1, it is characterised in that the volumetric constraint dress
Put and the lithium ion battery is limited along the size on electrode slice stacked direction.
3. charge states of lithium ion battery monitoring method according to claim 2, it is characterised in that the volumetric constraint dress
Put including at least one pressing plate, for by the lithium ion battery during charge and discharge cycles along the electrode slice stacked direction
On size be fixed value, the pressure sensor is arranged between the lithium ion battery and the pressing plate.
4. charge states of lithium ion battery monitoring method according to claim 3, it is characterised in that the lithium ion battery
The electrode slice be stacked in the same direction, the pressing plate is tabular, the electrode slice of the lithium ion battery with
The pressing plate be arranged in parallel；Or the electrode slice of the lithium ion battery is set for takeup type, forms cylindric lithium ion
Battery, the pressing plate are cylindrical shape, are co-axially located at the periphery of the lithium ion battery.
5. charge states of lithium ion battery monitoring method according to claim 1, it is characterised in that the volumetric constraint dress
Putting makes the lithium ion battery before the charge and discharge cycles i.e. by an initial pressure.
6. charge states of lithium ion battery monitoring method according to claim 1, it is characterised in that the cell pressure-
SOC characteristic curves are obtained by following steps：
Charge and discharge cycles are carried out to standard lithium ion battery, while the standard lithium ion is limited by the volume limiting device
The volume of battery is fixed value；
The volume limiting device and institute by multiple time points during pressure sensor acquisition charge and discharge cycles
State the SOC value of the second pressure and the standard lithium ion battery between standard lithium ion battery；And
Using the obtained second pressure and the SOC value of the standard lithium ion battery be fitted to obtain the cell pressure-
SOC characteristic curves.
7. charge states of lithium ion battery monitoring method according to claim 1, it is characterised in that the standard lithium ion
Battery is that the lithium ion battery to be measured has same size and parameter in itself, or with the lithium ion battery to be measured.
A kind of 8. charge states of lithium ion battery monitoring device, it is characterised in that including volume limiting device and pressure sensor,
The volume limiting device is used for the volume of limiting lithium ion cell, and the pressure sensor is used to measure the volumetric constraint dress
Put the pressure between the lithium ion battery.
9. charge states of lithium ion battery monitoring device according to claim 8, it is characterised in that the volumetric constraint dress
Put and the lithium ion battery is limited along the size on electrode slice stacked direction.
10. charge states of lithium ion battery monitoring device according to claim 8, it is characterised in that also include monitoring mould
Block and output module；
The monitoring modular includes pressure acquisition module, SOC computing modules and memory module；
The pressure acquisition module is used to obtain the pressure data between the volume limiting device and the lithium ion battery, and
It is sent to the SOC computing modules；
The memory module is used for storage battery pressure-SOC characteristic curves；
The SOC computing modules are used to read the cell pressure-SOC characteristic curves from the memory module, and according to institute
State pressure data and corresponding lithium ion battery SOC value is calculated in the cell pressure-SOC characteristic curves；
The output module is used to export the lithium ion battery SOC value that the computing module obtains in real time.
11. a kind of charge states of lithium ion battery monitoring modular, it is characterised in that including monitoring modular and output module；
The monitoring modular includes pressure acquisition module, SOC computing modules and memory module；
The pressure acquisition module is used for the pressure data for obtaining pressure sensor acquisition, and is sent to the SOC computing modules；
The memory module is used for storage battery pressure-SOC characteristic curves；
The SOC computing modules are used to read the cell pressure-SOC characteristic curves from the memory module, and according to institute
State pressure data and corresponding lithium ion battery SOC value is calculated in the cell pressure-SOC characteristic curves；
The output module is used to export the lithium ion battery SOC value that the computing module obtains in real time.
12. a kind of charge states of lithium ion battery monitoring method, comprises the following steps：
Displacement transducer and battery displacement-SOC characteristic curves are provided；
Charge and discharge cycles are carried out to lithium ion battery to be measured；
The lithium ion to be measured at the time point to be measured during obtaining the charge and discharge cycles by institute's displacement sensors
The surface of battery is because of the first displacement caused by Volume Changes；And
First displacement is substituted into battery displacement-SOC characteristic curves, obtains the lithium ion to be measured at the time point to be measured
The SOC value of battery.
13. charge states of lithium ion battery monitoring method according to claim 12, it is characterised in that the displacement sensing
Device measures to change in size of the lithium ion battery along electrode slice stacked direction.
14. charge states of lithium ion battery monitoring method according to claim 12, it is characterised in that the battery position
Shifting-SOC characteristic curves are obtained by following steps：
Charge and discharge cycles are carried out to standard lithium ion battery；
The standard lithium ion battery at multiple time points during the charge and discharge cycles is obtained by displacement transducer
Surface is because of second displacement caused by Volume Changes and the SOC value of the standard lithium ion battery；And
It is fitted to obtain the battery position using the obtained second displacement and the SOC value of the standard lithium ion battery
Shifting-SOC characteristic curves.
15. a kind of charge states of lithium ion battery monitoring modular, it is characterised in that including monitoring modular and output module；
The monitoring modular includes displacement acquisition module, SOC computing modules and memory module；
The surface that the displacement acquisition module is used to obtain the lithium ion battery passes because of displacement data caused by Volume Changes
Deliver to the SOC computing modules；
The memory module is used for storage battery displacement-SOC characteristic curves；
The SOC computing modules are used to read the battery displacement-SOC characteristic curves from the memory module, and according to institute
Corresponding lithium ion battery SOC value is calculated in shift number evidence and the battery displacement-SOC characteristic curves；
The output module is used to export the lithium ion battery SOC value that the computing module obtains in real time.
16. a kind of charge states of lithium ion battery monitoring method, comprises the following steps：
Volume sensor and battery volume-SOC characteristic curves are provided；
Charge and discharge cycles are carried out to lithium ion battery to be measured；
The lithium ion to be measured at the time point to be measured during obtaining the charge and discharge cycles by the volume sensor
First volume of battery；And
First volume is substituted into battery volume-SOC characteristic curves, obtains the lithium ion to be measured at the time point to be measured
The SOC value of battery.
17. charge states of lithium ion battery monitoring method according to claim 16, it is characterised in that the cell body
Product-SOC characteristic curves are obtained by following steps：
Charge and discharge cycles are carried out to standard lithium ion battery；
The standard lithium ion battery at multiple time points during the charge and discharge cycles is obtained by volume sensor
The SOC value of second volume and the standard lithium ion battery；And
It is fitted to obtain the cell body using obtained second volume and the SOC value of the standard lithium ion battery
Product-SOC characteristic curves.
18. a kind of charge states of lithium ion battery monitoring modular, it is characterised in that including monitoring modular and output module；
The monitoring modular includes position volume modulus block, SOC computing modules and memory module；
The volume acquisition module is used for the volume data for obtaining the lithium ion battery, and is sent to the SOC computing modules；
The memory module is used for storage battery volume-SOC characteristic curves；
The SOC computing modules are used to read the battery volume-SOC characteristic curves from the memory module, and according to institute
State volume data and corresponding lithium ion battery SOC value is calculated in the battery volume-SOC characteristic curves；
The output module is used to export the lithium ion battery SOC value that the computing module obtains in real time.
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