CN106405424A - Method and device for metering residual electric quantity of lithium ion battery - Google Patents
Method and device for metering residual electric quantity of lithium ion battery Download PDFInfo
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- CN106405424A CN106405424A CN201610696818.0A CN201610696818A CN106405424A CN 106405424 A CN106405424 A CN 106405424A CN 201610696818 A CN201610696818 A CN 201610696818A CN 106405424 A CN106405424 A CN 106405424A
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- lithium ion
- ion battery
- dump energy
- discharge
- voltage difference
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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]
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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]
- G01R31/3644—Constructional arrangements
- G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
-
- 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
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a method and device for metering the residual electric quantity of a lithium ion battery. The method includes the steps of performing pulse discharging on the lithium ion battery under discharging current in discharging time; obtaining a voltage difference between when the lithium ion battery is not subjected to pulse discharging and when the lithium ion battery is subjected to pulse discharging; and obtaining the residual electric quantity of the lithium ion battery according to the abovementioned voltage difference.
Description
Technical field
The invention mainly relates to the field of measuring techniques of lithium ion battery dump energy, more particularly, to a kind of lithium ion battery
The metering method of dump energy and device.
Background technology
With the popularization of the mobile communication products such as smart mobile phone, notebook computer, the development of electric vehicle and too
The needs of sun energy battery applications, before more preferable battery does not occur, as a kind of high-energy secondary battery, it is only for lithium ion battery
Special advantage will be used widely in a very long time.In many applications, it is required for understanding that lithium ion battery remains in real time
Remaining electricity is to estimate the pot life of battery.
At present it is known that lithium ion battery dump energy metering method mainly have charge accumulation method and open circuit voltage method.Electricity
Lotus method of cumulative scale is to estimate battery remaining power by the net charge measuring inflow/outflow battery.The method is to inflow/outflow electricity
The total current in pond carries out time integral, obtains the electricity of inflow/outflow, battery initial quantity of electricity ± inflow/outflow electricity=residue
Electricity.Battery initial quantity of electricity can be preset, also can carry out study in complete charging-discharging cycle and update.This metering method according to
, there is cumulative error problem in bad battery initial quantity of electricity.
Open circuit voltage method is to obtain dump energy by monitoring battery open circuit voltage, this is because battery terminal voltage and surplus
There is the corresponding relation of a determination between remaining electricity.But the limitation of the method is this corresponding relation to be needed to stand phase in battery open circuit
Just set up after long-time, only at this moment pass through to measure open-circuit voltage during battery zero load and could obtain relatively accurate result,
But practical application is required for obtaining dump energy in charge and discharge process.Therefore this method is not suitable for for real time measure battery
Dump energy.
Have in practical application and two methods are improved or is combined the trial carrying out dump energy assessment, including logical
Cross various algorithms to improve the precision of assessment.These technology include fuzzy logic, Kalman filtering, neutral net, recurrence, self
Study etc..But, these assessments based on charge accumulation method and open circuit voltage method it is impossible to fundamentally solution inherently scarce
Fall into, cause the metering of lithium ion battery dump energy accuracy is low, stability is poor.
Content of the invention
The present invention proposes a kind of metering method of lithium ion battery dump energy and device, can improve the meter of dump energy
The precision of amount and real-time.
The present invention proposes a kind of metering method of lithium ion battery dump energy, comprises the following steps：Make lithium-ion electric
Pond carries out pulsed discharge under discharge current and discharge time；Obtain during the non-pulsed discharge of lithium ion battery and during pulsed discharge
Voltage difference；And the dump energy of lithium ion battery is obtained according to above-mentioned voltage difference.
According to one embodiment of the invention, carry out this pulsed discharge multiple and repeatedly determine voltage difference, and calculate multiple electricity
The meansigma methodss of pressure reduction.
According to one embodiment of the invention, repeatedly the discharge time of this pulsed discharge is identical.
According to one embodiment of the invention, the discharge time of repeatedly this pulsed discharge is different.
According to one embodiment of the invention, repeatedly the discharge current of this pulsed discharge is identical.
According to one embodiment of the invention, the discharge current of repeatedly this pulsed discharge is different.
According to one embodiment of the invention, obtain the step bag of the dump energy of lithium ion battery according to this voltage difference
Include：In the corresponding relation of the dump energy this voltage difference being substituted into predetermined voltage difference and lithium ion battery, corresponded to
Lithium ion battery dump energy.
The present invention proposes a kind of metering device of lithium ion battery dump energy, including：Controlled conductive path, connecting should
The positive pole of lithium ion battery and negative pole are with to this lithium-ion electric tank discharge；Voltage detector, connects the positive pole of this lithium ion battery
With negative pole with obtain lithium ion battery pulsed discharge when with non-pulsed discharge when voltage difference；Control unit, connects this conduction
Path and this voltage detector, this controller is configured to make lithium ion battery enter horizontal pulse under discharge current and discharge time put
Electricity, and obtain this voltage difference from this voltage detector；And processing unit, connect this control unit, determined according to this voltage difference
The dump energy of lithium ion battery.
According to one embodiment of the invention, this controlled conductive path includes current source and the switch connected, and this switch is even
Connect this control unit.
According to one embodiment of the invention, this control unit is configured to carry out this pulsed discharge multiple, and this processing unit is joined
It is set to multiple this voltage difference of determination, and calculate the meansigma methodss of multiple voltage differences.
According to one embodiment of the invention, this control unit and this processing unit are to become one.
The present invention also proposes a kind of Li ion cells unit, and including lithium ion battery, and above-mentioned lithium ion battery remains
The metering device of remaining electricity.
The technique scheme of the present invention carries out fast-pulse electric discharge to lithium ion battery two ends, and now lithium ion battery is being just
The electronics of pole is gathered in side of the positive electrode due to barrier film；Simultaneously from the lithium ion of negative pole deintercalation because larger mobility temporal aggregate is negative
Pole side.So form raw electric capacity, capacitance C=Q/V in moment in inside lithium ion cellc.Wherein Q assembles for capacitive surface
Electric charge；VcFor electric capacity both end voltage, it is also equal to the voltage difference of battery-end before and after pulsed discharge.Under equal test environment, electric capacity
Value C keeps constant, therefore differential voltage VcIt is directly proportional with capacitive surface charge Q.Under the conditions of equal pulsed discharge, surface charge
The density of Q becomes one-to-one relationship, therefore differential voltage V with negative electrode lithium ion densitycExist one by one with negative electrode lithium ion density
Corresponding relation.At this moment the negative electrode lithium ion density of microcosmoss is just indicate the battery dump energy of macrocosm.From there through
Pulsed discharge-differential voltage detection can directly obtain the dump energy of lithium ion battery.
By technique scheme, the present invention can carry out direct measurement to lithium ion battery dump energy, and real-time is high,
And structure is simple.
Brief description
Fig. 1 is the metering device electrical schematic diagram of lithium ion battery dump energy according to an embodiment of the invention.
Fig. 2 is the Li ion cells unit structure chart comprising metering device according to an embodiment of the invention.
Fig. 3 is the metering method flow chart of lithium ion battery dump energy according to an embodiment of the invention.
Specific embodiment
It is that the above objects, features and advantages of the present invention can be become apparent, below in conjunction with the tool to the present invention for the accompanying drawing
Body embodiment elaborates.
Elaborate a lot of details in the following description in order to fully understand the present invention, but the present invention is acceptable
To be implemented different from alternate manner described here using other, therefore the present invention is not limited by following public specific embodiment
System.
The essence of existing lithium ion battery dump energy metering method is by the measurement to quantity of states such as voltage, electric currents
Indirectly being estimated, therefore its measuring accuracy is limited for value.
Embodiments of the invention describe the mode that a kind of dump energy to lithium ion battery is measured, can by lithium from
Sub- battery dump energy is directly measured as a physical quantity.And, this mode can use in lithium ion battery
Each stage is measured in real time.
Fig. 1 is the metering device electrical schematic diagram of lithium ion battery dump energy according to an embodiment of the invention.With reference to Fig. 1
Shown, the metering device of the present embodiment includes current source 101, switch 102, voltage detector 103, control unit 104 and processes
Unit 105, in order to measure the dump energy of lithium ion battery 120.In the present embodiment, lithium ion battery 120 can be by one
Or multiple battery unit (cell) compositions.Current source 101, switch 102 are connected in series in the positive pole of lithium ion battery 120 and bear
Between pole, to form a controlled conductive path.In this conductive path, current source 101 provides discharge current, switch
102 can close under the control of signal, within a period of time, lithium ion battery 120 is discharged.It is appreciated that controlled leads
Power path can have other forms.Voltage detector 103 can detect the voltage of lithium ion battery 120, and this is presented as battery
Voltage between positive pole and negative pole.
Control unit 104 1 aspect connects the conductive path being made up of current source 101, switch 102, on the other hand connects electricity
Pressure detector 103.Controller 104 is configured to make lithium ion battery 120 carry out pulsed discharge under discharge current and discharge time,
And obtain first voltage V during the non-pulsed discharge of lithium ion battery 1200With second voltage V during electric discharge1Between voltage difference.
Discharge current I depends on current source 101, and discharge time t depends on the time that switch 104 is opened, and this two values can be right
Controller 104 is known or unknown.Current source 101 can be constant current source or variable electric current
Source.When using variable current source, control unit 104 may be connected to current source 101 to control the size of discharge current.Controller
104 can send pulse control signal to switch 102, the time opened with controlling switch 102.Switch is made in pulse control signal
102 level opened (such as high level) have the dutycycle of very little.It is appreciated that in order to detect dump energy and putting of carrying out
Electricity should change electricity as small as possible, has therefore carried out time shorter pulsed discharge.Certainly, pulsed discharge also contemplate lithium from
The factor of sub- inside battery, this will discuss later.Discharge time t can have the very big range of choice, from tens nanoseconds to several
Hundred milliseconds.As a rule, t can be controlled in Microsecond grade.
Control unit 104 connects voltage detector 103, so that voltage V when obtaining non-pulsed discharge0With voltage V during electric discharge1
Between voltage difference.Voltage detector 103 can obtain differential voltage value by calculating, and it is poor also can be obtained by differential voltage detection
Component voltage value.When differential voltage detects and obtains differential voltage value, voltage detector 103 may not necessarily obtain non-pulse respectively and put
Voltage V when electric0With voltage V during electric discharge1, but directly obtain voltage difference.
Processing unit 105 connects control unit 104, for according to voltage difference VcDetermine the remaining electricity of lithium ion battery 120
Amount.In one embodiment, control unit 104 and processing unit 105 can be become one.Such as control unit 104 and place
Reason unit 105 is integrated on the same chip.
Fig. 2 is the Li ion cells unit structure chart comprising metering device according to an embodiment of the invention.With reference to Fig. 2 institute
Show, Li ion cells unit includes lithium ion battery 120.Typical lithium ion battery 120 includes positive pole 121, negative pole 122, electricity
Solution liquid and barrier film 123, anode electrode 124 and negative electrode 125.When being charged to battery, positive pole 121 there is lithium ion give birth to
Become, the lithium ion of generation is through electrolyte movement to negative pole 122.Have many a lot of micropores in negative pole 122, reach the lithium of negative pole from
Son is just embedded in micropore, and embedded lithium ion is more, and charging capacity is higher.Equally, when discharging to battery, it is embedded in negative
Lithium ion abjection in pole 122, move back positive pole 121 again.The lithium ion returning positive pole 121 is more, and discharge capacity is higher.
When switch 102 closure of metering device produces pulsed discharge, electronics cannot penetrate barrier film 123 and in positive pole 121
Side is gathered；The lithium ion of negative pole 122 side deintercalation, due to larger mobility, does not still have enough time to penetrate barrier film 123 and in negative pole 122
Side is assembled.Thus define raw electric capacity C in the moment it is assumed that its voltage is V in inside lithium ion cellc.Non- pulse is put
When electric, voltage detector 103 detects battery terminal voltage VBValue be V0；During pulsed discharge, due to the electricity on electric capacity C raw in moment
Pressure VcPresence, voltage detector 103 detect battery terminal voltage VBValue V1=V0-Vc.When thus, by obtaining non-pulsed discharge
With voltage difference V during pulsed discharge0-V1, the voltage V on electric capacity C can be obtainedc.Under equal test environment, capacitance C keeps not
Become, therefore voltage difference VcIt is directly proportional with capacitive surface charge Q.Under the conditions of equal pulsed discharge, the density of surface charge Q with negative
Pole lithium ion density becomes one-to-one relationship, therefore voltage difference VcThere is one-to-one relationship with negative electrode lithium ion density.And it is micro-
The negative electrode lithium ion number density seen just is indicate the battery dump energy of macroscopic view.From there through voltage difference VcCan characterize exactly
The dump energy of lithium ion battery 120.
After lithium ion battery 120 produces, voltage difference V can be obtained ahead of time by testcWith remaining of lithium ion battery 120
Corresponding relation between remaining electricity.This corresponding relation can be preserved by form or fitting function.In lithium ion battery 120
During use, after above-mentioned apparatus and method obtain voltage difference, can by voltage difference substitute into predetermined voltage difference with
In the corresponding relation of the dump energy of lithium ion battery, obtain the dump energy of corresponding lithium ion battery 120.
In addition, it is contemplated that single pulse electric discharge and measurement unstable, control unit 104 is configured to carry out multiple pulses
Electric discharge, processing unit 105 is then configured to repeatedly obtain voltage difference, and calculates the meansigma methodss of multiple voltage differences as final result.
Each subpulse electric discharge in, discharge time can identical it is also possible to differ.Likewise, discharge current can identical it is also possible to
Differ.
As it was previously stated, discharge time t can control in tens nanoseconds to hundreds of millisecond.Certainly this not limits, during electric discharge
Between t selection, except considering less outer on battery electric quantity impact it is also contemplated that needs are short enough to make lithium ion due to larger
Mobility, still do not have enough time to penetrate barrier film 123 and temporarily assemble in negative pole 122 side.
The dump energy metering method of the present embodiment has obvious advantage compared with known way.First, by difference
Voltage VcMetering, direct measurement can be carried out to lithium ion battery dump energy, this makes degree of accuracy be obviously improved.According to examination
Test, this metering method can be within by degree of accuracy, the 3%-8% from current application rises to 1%.Lithium ion battery is remained
For remaining electric quantity metering, this is difficult very much, and significant, because accurate dump energy metering is battery management system
The basis of system, the cell discordance of such as lithium ion battery is larger, needs to carry out in the case of accurate measuring electric quantity
Equilibrium.Secondly, each stage (when inclusion is discharged) that the metering method of the present embodiment can use in lithium ion battery enters
Row measures in real time.Furthermore, the metering method of the present embodiment, structure is very simple, reduces installation cost.
Fig. 3 is the metering method flow chart of lithium ion battery dump energy according to an embodiment of the invention.With reference to Fig. 3 institute
Show, for conclusion, the metering method of the lithium ion battery dump energy of the present embodiment, comprise the following steps：
In step 301, lithium ion battery is made to carry out pulsed discharge under discharge current and discharge time；
In step 302, obtain during lithium ion battery pulsed discharge and voltage difference during non-pulsed discharge；
In step 303, obtain the dump energy of lithium ion battery according to this voltage difference.
The metering method of the lithium ion battery dump energy of the present embodiment can be real in hereinbefore described metering device
Apply, it will also be understood, however, that those skilled in the art can be real in other metering devices according to the spirit of this metering method
Apply.
Although the present invention to describe with reference to current specific embodiment, those of ordinary skill in the art
It should be appreciated that above embodiment is intended merely to the present invention is described, also can make in the case of without departing from present invention spirit
Go out various equivalent change or replacement, therefore, as long as to the change of above-described embodiment, change in the spirit of the present invention
Type all will fall in the range of following claims.
Claims (12)
1. a kind of metering method of lithium ion battery dump energy, comprises the following steps：
Lithium ion battery is made to carry out pulsed discharge under discharge current and discharge time；
Obtain voltage difference during the non-pulsed discharge of lithium ion battery and during pulsed discharge；
Obtain the dump energy of lithium ion battery according to this voltage difference.
2. the metering method of lithium ion battery dump energy according to claim 1 is it is characterised in that carry out this arteries and veins multiple
Impulse electricity and repeatedly acquisition voltage difference, and calculate the meansigma methodss of multiple voltage differences.
3. lithium ion battery dump energy according to claim 2 metering method it is characterised in that repeatedly this pulse put
The discharge time of electricity is identical.
4. lithium ion battery dump energy according to claim 2 metering method it is characterised in that repeatedly this pulse put
The discharge time of electricity is different.
5. lithium ion battery dump energy according to claim 2 metering method it is characterised in that repeatedly this pulse put
The discharge current of electricity is identical.
6. lithium ion battery dump energy according to claim 2 metering method it is characterised in that repeatedly this pulse put
The discharge current of electricity is different.
7. the metering method of lithium ion battery dump energy according to claim 1 is it is characterised in that according to this voltage difference
Step to obtain the dump energy of lithium ion battery includes：This voltage difference is substituted into predetermined voltage difference and lithium-ion electric
In the corresponding relation of the dump energy in pond, obtain the dump energy of corresponding lithium ion battery.
8. a kind of metering device of lithium ion battery dump energy, including：
Controlled conductive path, connects the positive pole of this lithium ion battery and negative pole with to this lithium ion battery pulsed discharge；
Voltage detector, connects positive pole and the negative pole of this lithium ion battery, with obtain lithium ion battery pulsed discharge when with not
Voltage difference during pulsed discharge；
Control unit, connects this conductive path and this voltage detector, and this controller is configured to make lithium ion battery in electric discharge electricity
Carry out pulsed discharge under stream and discharge time, and obtain this voltage difference from this voltage detector；And
Processing unit, connects this control unit, determines the dump energy of lithium ion battery according to this voltage difference.
9. the metering device of lithium ion battery dump energy as claimed in claim 8 is it is characterised in that this controlled conductive path
Footpath includes current source and the switch connected, and this switch connects this control unit.
10. the metering device of lithium ion battery dump energy as claimed in claim 8 is it is characterised in that this control unit is joined
It is set to and carries out this pulsed discharge multiple, this processing unit is configured to repeatedly obtain this voltage difference, and calculate the flat of multiple voltage differences
Average.
The metering device of 11. lithium ion battery dump energies as claimed in claim 8 it is characterised in that this control unit and
This processing unit is to become one.
A kind of 12. Li ion cells units, including lithium ion battery, and the lithium ion as described in any one of claim 8-11
The metering device of battery dump energy.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610696818.0A CN106405424B (en) | 2016-08-19 | 2016-08-19 | Method and device for metering residual electric quantity of lithium ion battery |
| PCT/CN2016/098498 WO2018032557A1 (en) | 2016-08-19 | 2016-09-09 | Method and apparatus for metering remaining electric quantity of lithium-ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610696818.0A CN106405424B (en) | 2016-08-19 | 2016-08-19 | Method and device for metering residual electric quantity of lithium ion battery |
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| Publication Number | Publication Date |
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| CN106405424A true CN106405424A (en) | 2017-02-15 |
| CN106405424B CN106405424B (en) | 2020-04-03 |
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| CN201610696818.0A Active CN106405424B (en) | 2016-08-19 | 2016-08-19 | Method and device for metering residual electric quantity of lithium ion battery |
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| CN (1) | CN106405424B (en) |
| WO (1) | WO2018032557A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110297192A (en) * | 2019-07-04 | 2019-10-01 | 广东乐心医疗电子股份有限公司 | Electricity bearing calibration when the method and booting of electricity when a kind of estimation battery charging and discharging |
| CN111781516A (en) * | 2020-07-14 | 2020-10-16 | 深圳市道通科技股份有限公司 | Detection method of vehicle storage battery and battery detection equipment |
| WO2022012516A1 (en) * | 2020-07-14 | 2022-01-20 | 深圳市道通科技股份有限公司 | Method for detecting surface charge of storage battery and battery detection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113178632B (en) * | 2021-04-25 | 2022-06-28 | 上海空间电源研究所 | Method for recovering monomer consistency of lithium ion storage battery pack |
| CN113258645B (en) * | 2021-06-07 | 2024-02-27 | 深圳羽衡科技有限公司 | Intelligent system for monitoring battery of electric vehicle |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2018032557A1 (en) | 2018-02-22 |
| CN106405424B (en) | 2020-04-03 |
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