CN109655750A - Prediction technique, the prediction meanss of battery life - Google Patents
Prediction technique, the prediction meanss of battery life Download PDFInfo
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Abstract
The invention discloses a kind of prediction techniques of battery life, prediction meanss, wherein the prediction technique is the following steps are included: obtain the initial internal resistance of battery and the current cycle time of battery；Under default test condition, internal resistance of the battery in previous cycle is calculated；According to the global cycle number of the internal resistance prediction battery of initial internal resistance, current cycle time and battery in previous cycle.The prediction technique, the global cycle number of battery can be predicted according to internal resistance of the initial internal resistance, current cycle time and battery of battery in previous cycle, the prediction for realizing battery life, makes user quickly understand battery life situation, and has the advantages that accuracy is high, is easily achieved.
Description
Technical field
The present invention relates to battery technology field, in particular to a kind of prediction technique of battery life, a kind of battery life
Prediction meanss.
Background technique
With the progress of battery technology, the ownership of electric vehicle is increasing year by year, and consumer is to power electric in electric car
The service life in pond is also increasingly paid close attention to, and the end of life of power battery is generally defined as its internal resistance and increases by 50%, at this point, electric
Pond is considered as that can not continue to use, and needs to be serviced and replaces, and at this moment the internal resistance of battery can also increase sharply, thus sternly
Ghost image rings the performance of battery.In order to the apparent service life that battery is understood more intuitively, need to carry out battery life
Prediction.
Currently, the life prediction of battery is mainly predicted by physical model and data model, physical model is mainly root
The service life of battery is predicted according to current condition, power condition, raw material characteristics in battery use process etc.；Data model is logical
Cross the statistical analysis voltage of battery, temperature, time predict the remaining life of battery.However, in order to establish an accurately number
It according to model, needs to analyze Multiple factors, and carries out complicated operation, moreover, the reality obtained by physical model and data model
Whether border prediction result is accurate and reliable, and there are also to be assessed.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
First purpose be to propose that a kind of prediction technique of battery life, this method can predict the global cycle number of battery, i.e., in fact
The prediction of existing battery life makes user quickly understand the life situations of battery, and this method has that accuracy is high, is easily achieved
Advantage.
Second object of the present invention is to propose a kind of prediction meanss of battery life.
Third object of the present invention is to propose the prediction meanss of another battery life.
To achieve the above object, first aspect present invention embodiment proposes a kind of prediction technique of battery life, including
Following steps: the initial internal resistance of the battery and the current cycle time of the battery are obtained；Under default test condition, calculate
Internal resistance of the battery in previous cycle；According to the initial internal resistance, the current cycle time and the battery current
The global cycle number of the battery is predicted in internal resistance in circulation.
The prediction technique of battery life according to an embodiment of the present invention obtains the initial internal resistance and previous cycle of battery first
Number calculates internal resistance of the battery in previous cycle, finally according to the initial internal resistance, institute then under default test condition
State the global cycle number that the battery is predicted in the internal resistance of current cycle time and the battery in previous cycle.The party as a result,
Method can predict the global cycle number of battery, that is, realize the prediction of battery life, user is made to quickly understand battery life situation, and
This method has the advantages that accuracy is high, is easily achieved.
In addition, the prediction technique of battery life according to the above embodiment of the present invention can also have following additional technology
Feature:
According to one embodiment of present invention, the default test condition includes: that the temperature of environment where the battery is
The time of repose of preset temperature, the battery is not less than preset time, and after the preset time described in the battery standing, according to
Predetermined manner controls the battery and carries out pulse charge and discharge.
According to one embodiment of present invention, described to control the battery progress pulse charge and discharge, packet according to predetermined manner
It includes: in the 0-t1 period, controlling the battery with the first electric current and carry out constant-current discharge；In the t1-t2 period, the battery is controlled
Stop charge and discharge；In the t2-t3 period, the battery is controlled with the second electric current and carries out constant-current charge, wherein second electric current
Less than first electric current.
According to one embodiment of present invention, the battery includes in i-th circulation in the internal resistance in i-th circulation
Electric discharge at least one of internal resistance and internal charging resistance, wherein calculate the battery putting in i-th circulation according to the following formula
Electric internal resistance and internal charging resistance:
Ri, dis=| (V2 '-V0 ')/(I2 '-I0 ') |,
Ri, cha=| (V6 '-V4 ')/(I6 '-I4 ') |,
Wherein, Ri, dis are electric discharge internal resistance of the battery in i-th circulation, and V2 ' is the electricity of battery described in the t1 moment
Pressure, V0 ' are the voltage of battery described in 0 moment, and I2 ' is the electric current of battery described in the t1 moment, and I0 ' is the electricity of battery described in 0 moment
Stream, Ri, cha are internal charging resistance of the battery in i-th circulation, and V6 ' is the voltage of battery described in the t3 moment, and V4 ' is t2
The voltage of battery described in moment, I6 ' are the electric current of battery described in the t3 moment, and I2 ' is the electric current of battery described in the t2 moment.
According to one embodiment of present invention, the global cycle number of the battery is predicted according to the following formula:
N=n+ (R0*a-Rn)/△ R,
Wherein, △ R=(Rn-Rn-m)/m indicates that the internal resistance increase rate of n-th circulation, n are the current cycle time, and
N is the integer more than or equal to 3, and N is the global cycle number, R0For the initial internal resistance, a be more than or equal to
150% constant, RnFor internal resistance of the battery in n-th circulation, m is the integer more than or equal to 3, and is constant.
According to one embodiment of present invention, when internal resistance of the battery in i-th circulation is only included in i-th circulation
In electric discharge internal resistance when, the global cycle number of the battery is according to the calculated global cycle number of electric discharge internal resistance；Work as institute
Battery is stated when the internal resistance in i-th circulation only includes the internal charging resistance in i-th circulation, the global cycle number of the battery
For according to the calculated global cycle number of the internal charging resistance；When internal resistance of the battery in i-th circulation is included in i-th
When electric discharge internal resistance in circulation and internal charging resistance, the global cycle number of the battery is calculated always according to the electric discharge internal resistance
Cycle-index and average value according to the calculated global cycle number of the internal charging resistance.
According to one embodiment of present invention, the prediction technique of the battery life, further includes: when always following for the battery
When ring number is less than lifetime threshold, issue warning signal, to prompt user to safeguard the battery.
According to one embodiment of present invention, the prediction technique of the battery life, further includes: calculated when continuous c times
To internal resistance increase rate be all larger than the last internal resistance increase rate being calculated when, issue warning signal, to prompt user to institute
It states battery to be safeguarded, wherein c is the integer more than or equal to 2, and is constant.
To achieve the above object, second aspect of the present invention proposes a kind of prediction meanss of battery life, comprising: obtains mould
Block, for obtaining the initial internal resistance of the battery and the current cycle time of the battery；Computing module, in default test
Under the conditions of, calculate internal resistance of the battery in previous cycle；Prediction module, for according to the initial internal resistance, described current
The global cycle number of the battery is predicted in the internal resistance of cycle-index and the battery in previous cycle.
The prediction meanss of battery life according to an embodiment of the present invention obtain the initial interior of battery by obtaining module first
The current cycle time of resistance and battery, then under default test condition, computing module calculate battery in previous cycle in
Resistance is finally predicted by prediction module according to internal resistance of the initial internal resistance, current cycle time and battery of battery in previous cycle
The global cycle number of battery.The device can pass through the internal resistance in the initial internal resistance, current cycle time and previous cycle of battery
It predicts the global cycle number of battery, that is, realizes the prediction of battery life, user is made to quickly understand the life situations of battery, and the party
Method has the advantages that accuracy is high, is easily achieved.
In order to achieve the above object, third aspect present invention proposes the prediction meanss of another battery life, including memory,
Processor and storage on a memory and the computer program that can run on the processor, the processor execution journey
When sequence, the prediction technique of the above-mentioned battery life of the present embodiment is realized.
The prediction meanss of the battery life of the embodiment of the present invention can be passed through using the prediction technique of above-mentioned battery life
The global cycle number of internal resistance prediction battery in the initial internal resistance of battery, current cycle time and previous cycle, i.e. realization battery
The prediction in service life makes user quickly understand the life situations of battery, and this method has the advantages that accuracy is high, is easily achieved.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Fig. 1 is the flow chart of the prediction technique of battery life according to an embodiment of the present invention；
Fig. 2 is the flow chart that an exemplary battery carries out pulse charging/discharging thereof according to the present invention；
The when m- current relationship curve graph of battery when Fig. 3 is the pulse charge and discharge of a specific example according to the present invention；
Fig. 4 is the prediction meanss of battery life according to an embodiment of the invention；
Fig. 5 is the prediction meanss of battery life in accordance with another embodiment of the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings prediction technique, the prediction meanss of the battery life of the embodiment of the present invention are described.
Fig. 1 is the flow chart of the prediction technique of battery life according to an embodiment of the present invention.
As shown in Figure 1, the prediction technique of the battery life of the embodiment of the present invention, comprising the following steps:
S1 obtains the initial internal resistance of battery and the current cycle time of battery.
In this embodiment, battery can be lithium battery, initial internal resistance value refer to lithium battery when recycling first time, default
Internal resistance value under electricity and preset temperature, wherein default electricity may range from 30%~80%, and preset temperature refers to lithium electricity
The common temperature in pond, any one temperature value within the temperature range of can choose lithium battery in normal work is as default temperature
Degree, such as 25 DEG C, can by obtain internal resistance value of the lithium battery when recycling first time, under default electricity and preset temperature come
The initial internal resistance of battery is obtained, circulation refers to that the first time charge and discharge for the battery for not carrying out charge and discharge use for the first time.
S2 calculates internal resistance of the battery in previous cycle under default test condition.
In an example of the invention, test condition is preset can include: the temperature of environment where battery is preset temperature,
The time of repose of battery is not less than preset time, and after battery standing preset time, carries out according to predetermined manner control battery
Pulse charge and discharge.
Further, carrying out pulse charge and discharge according to predetermined manner control battery can comprise the following steps that
S21 controls battery with the first electric current and carries out constant-current discharge in the 0-t1 period.
S22 controls battery and stops charge and discharge in the t1-t2 period.
S23 controlled battery with the second electric current and carries out constant-current charge in the t2-t3 period, wherein the second electric current is less than the
One electric current.
Optionally, it can be tested in the range of 30%~80% at SOC (State of Charge, battery capacity),
The internal resistance of battery is more stable at this time.Preset temperature can value, for example 25 DEG C, preset time can be small for 4 in 22 DEG C~28 DEG C
When, t1 can be 30s, and t2 can be 70s, and t3 can be 85s, and the size of the second electric current can be 3/4ths of the first size of current
Times, it is as shown in table 1 below the corresponding electric current of pulse charge and discharge step and time.
Table 1
| Time incrementss/s | Cumulative time/s | Electric current/A |
| 0 | 0 | 0 |
| 30 | 30 | Imax1 |
| 40 | 70 | 0 |
| 15 | 85 | -0.75Imax1 |
Specifically, control battery with the first electric current Imax1 and carry out constant-current discharge as shown in figure 3, in the 0-30s period,
In the 30s-70s period, controlling battery and stop charge and discharge, i.e. the charging and discharging currents of battery are 0, in the 70s-85s period, control
Battery carries out constant-current charge with the second electric current 0.75*Imax1.
In one example, battery may include the electric discharge internal resistance in i-th circulation in the internal resistance in i-th circulation and fill
At least one of electric internal resistance, wherein battery can be calculated according to the following formula in the electric discharge internal resistance and charging in i-th circulation
Resistance:
Ri, dis=| (V2 '-V0 ')/(I2 '-I0 ') |,
Ri, cha=| (V6 '-V4 ')/(I6 '-I4 ') |,
Wherein, i is the integer greater than 0, and Ri, dis are electric discharge internal resistance of the battery in i-th circulation, and V2 ' is t1 moment electricity
The voltage in pond, voltage of the V0 ' for 0 moment battery, electric current of the I2 ' for t1 moment battery, electric current of the I0 ' for 0 moment battery, Ri,
Cha is internal charging resistance of the battery in i-th circulation, and V6 ' is the voltage of t3 moment battery, and V4 ' is the voltage of t2 moment battery,
I6 ' is the electric current of t3 moment battery, and I2 ' is the electric current of t2 moment battery.
Specifically, when t1 is 30s, t2 70s, when t3 is 85s, V2 ' is the voltage of 30s moment battery, when I2 ' is 30s
The electric current of battery is carved, V6 ' is the voltage of 85s moment battery, and V4 ' is the voltage of 70s moment battery, and I6 ' is 85s moment battery
Electric current, I2 ' are the electric current of 70s moment battery.
It should be noted that according to predetermined manner control battery carry out pulse charge and discharge be not limited to above-mentioned steps S21~
The mode of S23 can also be and only carry out pulse charge within the testing time, perhaps only carries out pulsed discharge or carries out multiple
Pulse charge, or carry out multiple pulses electric discharge etc., the charge and discharge time can be set as needed, herein without limitation.When
So, the calculation and above-mentioned calculating Ri, dis and Ri of electric discharge internal resistance and internal charging resistance, the mode of cha are identical.
S3, according to the global cycle of the internal resistance prediction battery of initial internal resistance, current cycle time and battery in previous cycle
Number.
In an example of the invention, the global cycle number of battery can be predicted according to the following formula:
N=n+ (R0*a-Rn)/△ R,
Wherein, △ R=(Rn-Rn-m)/m indicates the internal resistance increase rate of n-th circulation, and n is current cycle time, and n is
Integer more than or equal to 3, N are global cycle number, R0For initial internal resistance, a is the constant more than or equal to 150%, RnFor
Internal resistance of the battery in n-th circulation, m are the integer more than or equal to 3, and are constant.
Wherein, R0* a may be defined as the lifetime threshold of battery, and the lifetime threshold of battery refers to the internal resistance initial value of battery
150% or higher.
Further, when internal resistance of the battery in i-th recycles only includes the electric discharge internal resistance in i-th circulation, electricity
The global cycle number in pond can be for according to the electric discharge calculated global cycle number of internal resistance；When battery i-th circulation in internal resistance only
When including internal charging resistance in i-th recycles, the global cycle number of battery can be for according to the calculated global cycle of internal charging resistance
Number；When internal resistance of the battery in i-th recycles includes electric discharge internal resistance and internal charging resistance in i-th circulation, battery
Global cycle number can be for according to the calculated global cycle number of electric discharge internal resistance and according to the calculated global cycle number of internal charging resistance
Average value.
It optionally, include electric discharge internal resistance and internal charging resistance in i-th circulation in the internal resistance in i-th circulation when battery
When, can also first calculate the average value of electric discharge internal resistance and internal charging resistance, the global cycle number of battery can according to the mean value calculation
Global cycle number out.
The prediction technique of the battery life of the embodiment of the present invention, being capable of initial internal resistance, current cycle time according to battery
With the global cycle number of the internal resistance prediction battery in previous cycle, that is, realizes the prediction of battery life, user is made to quickly understand electricity
Pond life situations, and this method has the advantages that accuracy is high, is easily achieved.
In an example of the invention, the prediction technique of battery life may also include that when the global cycle number of battery is small
It when lifetime threshold, issues warning signal, to prompt user to safeguard battery.
Specifically, when global cycle times N is less than lifetime threshold (such as 2000) of battery, the performance of the battery has been illustrated
It is destroyed, is issued warning signal, to prompt user to repair battery in time, and carry out necessary maintenance.It is advantageous as a result,
In holding the cell at controllable state.
Optionally, when current cycle time is more than or equal to preset times such as 500, if the global cycle predicted time
Number is less than the lifetime threshold of battery, then can directly issue warning signal；When current cycle-index is less than preset times, if
The global cycle number predicted is less than the lifetime threshold of battery, then can carry out the prediction of a circulation again, and so on, if
The global cycle number repeatedly such as predicted three times is respectively less than lifetime threshold, then issues warning signal.
In an example of the invention, the prediction technique of battery life may also include that be calculated when continuous c times it is interior
It when resistance increment rate is all larger than the last internal resistance increase rate being calculated, issues warning signal, to prompt user to carry out battery
Maintenance, wherein c is the integer more than or equal to 2, and is constant.
Specifically, in order to improve prediction battery global cycle number accuracy, reduce the influence of fluctuation, calculate internal resistance
When increment rate, with Continuous plus at least three times △ R and it can be compared, it may be assumed that at least calculate △ R=(R three timesn-Rn-m)/m, example
Such as, when △ R3 >=△ R2 >=△ R1 is presented in the internal resistance increase rate △ R being calculated when continuous 3 times, illustrate the life time decay of battery
The gesture that acceleration is presented, issues warning signal, to prompt user to safeguard battery.
It should be noted that the selection temperature close period is interior as much as possible in order to further increase the accuracy of prediction
Resistance increment rate △ R is compared.
In addition, it should also be noted that, when to by multiple lithium battery groups at power battery carry out life prediction when, can adopt
Life prediction is carried out at least two lithium batteries in power battery with above-mentioned prediction technique, and then according at least two lithium batteries
Prediction result prediction power battery service life.For example, when two lithium batteries of selection carry out life predictions, as a result respectively N1 and
It, can be using the average value of N1, N2 as the bimetry of power battery if N1, N2 value are close when N2；If N1, N2 take
Value difference it is larger, then can using value it is biggish that as the bimetry of power battery.When three lithium batteries of selection carry out the longevity
Life prediction, as a result respectively N1, N2 and N3 when, if N1, N2 and N3 value are close, the average value of N1, N2 and N3 can be made
For the bimetry of power battery；If any two value in N1, N2 and N3 is close, and differs larger with another,
It then can be using two similar in value average value as the bimetry of power battery.
In conclusion the prediction technique of the battery life according to the initial internal resistance of battery, current cycle time and can be worked as
The service life of internal resistance prediction battery in preceding circulation, and this method accuracy is high, is easily achieved, in addition, can be according to the total of battery
Cycle-index and internal resistance increase rate issue warning signal, and user is made to quickly understand the state of battery, with to battery carry out maintenance and
Maintenance, is conducive to hold the cell at controllable state.
Fig. 4 is the prediction meanss of battery life according to an embodiment of the invention.
As shown in figure 4, the prediction meanss 10 of the battery life of the embodiment of the present invention include: to obtain module 11, computing module
12 and prediction module 13.
Wherein, module 11 is obtained for obtaining the initial internal resistance of battery and the current cycle time of battery；Computing module 12
For calculating internal resistance of the battery in previous cycle under default test condition；Prediction module 13 be used for according to initial internal resistance, when
The global cycle number of the internal resistance prediction battery of preceding cycle-index and battery in previous cycle.
It should be noted that the explanation of the aforementioned prediction technique embodiment to battery life is also applied for the embodiment
Battery life prediction meanss, details are not described herein again.
The prediction meanss of the battery life of the embodiment of the present invention, first by obtain module obtain battery initial internal resistance and
The current cycle time of battery, then under default test condition, by computing module calculate battery in previous cycle in
Resistance finally predicts battery according to the internal resistance of initial internal resistance, current cycle time and battery in previous cycle by prediction module
Global cycle number, the device can predict the service life of battery as a result, so that user is quickly understood the life situations of battery, and accurate
Property it is high, be easily achieved.
Fig. 5 is the prediction meanss of battery life in accordance with another embodiment of the present invention.
As shown in figure 5, the prediction meanss 20 of the battery life of the embodiment of the present invention include: memory 21, processor 22 and
It is stored in the computer program 23 that can be run on memory 21 and on processor 22, when processor 22 executes program 23, is realized
The prediction technique of the battery life of the above embodiment of the present invention.
The prediction meanss of the battery life of the embodiment of the present invention realize above-mentioned reality when processor executes computer program
The prediction technique of the battery life of example is applied, it can be according in the initial internal resistance, current cycle time and previous cycle of battery
In the service life of resistance prediction battery, user is made to quickly understand the life situations of battery, and accuracy is high, is easily achieved, additionally it is possible to according to
The global cycle number and internal resistance increase rate of battery issue warning signal, to prompt user to carry out care and maintenance to battery, favorably
In holding the cell at controllable state.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (10)
1. a kind of prediction technique of battery life, which comprises the following steps:
Obtain the initial internal resistance of the battery and the current cycle time of the battery；
Under default test condition, internal resistance of the battery in previous cycle is calculated；
The battery is predicted according to the internal resistance of the initial internal resistance, the current cycle time and the battery in previous cycle
Global cycle number.
2. the prediction technique of battery life as described in claim 1, which is characterized in that the default test condition includes: institute
The temperature of environment where stating battery is preset temperature, and the time of repose of the battery is not less than preset time, and in the battery
After standing the preset time, the battery is controlled according to predetermined manner and carries out pulse charge and discharge.
3. the prediction technique of battery life as claimed in claim 2, which is characterized in that it is described control according to predetermined manner described in
Battery carries out pulse charge and discharge, comprising:
In the 0-t1 period, the battery is controlled with the first electric current and carries out constant-current discharge；
In the t1-t2 period, controls the battery and stop charge and discharge；
In the t2-t3 period, the battery is controlled with the second electric current and carries out constant-current charge, wherein second electric current is less than institute
State the first electric current.
4. the prediction technique of battery life as claimed in claim 3, which is characterized in that the battery is in i-th circulation
Internal resistance includes at least one of electric discharge internal resistance and internal charging resistance in i-th circulation, wherein calculates institute according to the following formula
State electric discharge internal resistance and internal charging resistance of the battery in i-th circulation:
Ri, dis=| (V2 '-V0 ')/(I2 '-I0 ') |,
Ri, cha=| (V6 '-V4 ')/(I6 '-I4 ') |,
Wherein, Ri, dis are electric discharge internal resistance of the battery in i-th circulation, and V2 ' is the voltage of battery described in the t1 moment,
V0 ' is the voltage of battery described in 0 moment, and I2 ' is the electric current of battery described in the t1 moment, and I0 ' is the electric current of battery described in 0 moment,
Ri, cha are internal charging resistance of the battery in i-th circulation, and V6 ' is the voltage of battery described in the t3 moment, and V4 ' is the t2 moment
The voltage of the battery, I6 ' are the electric current of battery described in the t3 moment, and I2 ' is the electric current of battery described in the t2 moment.
5. the prediction technique of battery life as claimed in claim 4, which is characterized in that predict the battery according to the following formula
Global cycle number:
N=n+ (R0*a-Rn)/△ R,
Wherein, △ R=(Rn-Rn-m)/m indicates the internal resistance increase rate of n-th circulation, and n is the current cycle time, and n is big
In or equal to 3 integer, N be the global cycle number, R0For the initial internal resistance, a is normal more than or equal to 150%
Number, RnFor internal resistance of the battery in n-th circulation, m is the integer more than or equal to 3, and is constant.
6. the prediction technique of battery life as claimed in claim 5, which is characterized in that
When the battery i-th circulation in internal resistance only include i-th circulation in electric discharge internal resistance when, the battery it is total
Cycle-index is according to the calculated global cycle number of electric discharge internal resistance；
When the battery i-th circulation in internal resistance only include i-th circulation in internal charging resistance when, the battery it is total
Cycle-index is according to the calculated global cycle number of the internal charging resistance；
It is described when internal resistance of the battery in i-th recycles includes electric discharge internal resistance and internal charging resistance in i-th circulation
The global cycle number of battery is to calculate according to the calculated global cycle number of the electric discharge internal resistance and according to the internal charging resistance
Global cycle number average value.
7. the prediction technique of battery life as claimed in claim 6, which is characterized in that further include:
When the global cycle number of the battery be less than lifetime threshold when, issue warning signal, with prompt user to the battery into
Row maintenance.
8. the prediction technique of battery life as claimed in claim 5, which is characterized in that further include:
When the internal resistance increase rate that continuous c times is calculated is all larger than the last internal resistance increase rate being calculated, early warning is issued
Signal, to prompt user to safeguard the battery, wherein c is the integer more than or equal to 2, and is constant.
9. a kind of prediction meanss of battery life characterized by comprising
Module is obtained, for obtaining the initial internal resistance of the battery and the current cycle time of the battery；
Computing module, for calculating internal resistance of the battery in previous cycle under default test condition；
Prediction module, for according to the initial internal resistance, the current cycle time and the battery in previous cycle in
The global cycle number of the battery is predicted in resistance.
10. a kind of prediction meanss of battery life, including memory, processor and storage are on a memory and can be in the processing
The computer program run on device, which is characterized in that when the processor executes described program, realize as in claim 1-8
The prediction technique of described in any item battery lifes.
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