CN109669130A  Internal resistance of cell Method for Accurate Calculation, computing device and readable storage medium storing program for executing  Google Patents
Internal resistance of cell Method for Accurate Calculation, computing device and readable storage medium storing program for executing Download PDFInfo
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 CN109669130A CN109669130A CN201811635471.4A CN201811635471A CN109669130A CN 109669130 A CN109669130 A CN 109669130A CN 201811635471 A CN201811635471 A CN 201811635471A CN 109669130 A CN109669130 A CN 109669130A
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 internal resistance
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Abstract
The invention discloses a kind of internal resistance of cell Method for Accurate Calculation, the signal value of preset quantity is obtained, and the signal value is substituted into default polynomial fitting, finds out the expression formula of polynomial fitting；The signal value for obtaining preset quantity is reacquired, examining the error of the polynomial fitting is to meet error requirement；If inspection obtains the polynomial fitting and meets error requirement, the polynomial fitting is loaded onto internal resistance calculation procedure.The invention also discloses a kind of detection device and readable storage medium storing program for executing.The present invention carries out calculation processing by the way that polynomial fitting data in internal resistance of cell detection process, are added, and effectively increases the accuracy of internal resistance detection instrument.
Description
Technical field
The present invention relates to internal resistance of cell detection field more particularly to a kind of internal resistance of cell Method for Accurate Calculation, computing device
And readable storage medium storing program for executing.
Background technique
Internal resistance instrument common measuring instrument when being detection battery and relative electronic components internal resistance, internal resistance instrument uses at present
Be the measurement method for exchanging fourwire system, i.e., measure the voltage U and electric current I of determinand respectively, then pass through whole circuit law of ohm:
Resistance R=voltage U/ electric current I, calculates the resistance value of determinand.But in actual use, itself setting due to circuit instrument
The factors such as meter, external disturbance will lead to tester detection and show that internal resistance numerical accuracy is greatly reduced.So wanting to obtain accurate
Internal resistance value need to further calculate the numerical value that obtains of detection, to correct the accuracy for improving internal resistance detection.
Therefore it is required to improve the calculation method of the detection accuracy of internal resistance test device.
Summary of the invention
The main purpose of the present invention is to provide a kind of internal resistance of cell Method for Accurate Calculation, it is intended to solve internal resistance test device
Measuring accuracy is unable to satisfy the problem of use demand.
To achieve the above object, the present invention provides a kind of internal resistance of cell Method for Accurate Calculation, and the internal resistance of cell is accurately counted
Calculation method the following steps are included:
The signal value of preset quantity is obtained, and the signal value is substituted into default polynomial fitting, it is multinomial to find out fitting
The expression formula of formula；
The signal value for obtaining preset quantity is reacquired, examining the error of the polynomial fitting is to meet error requirement；
If inspection obtains the polynomial fitting and meets error requirement, the polynomial fitting is loaded onto internal resistance and calculates journey
In sequence.
Optionally, the step of signal value for obtaining preset quantity includes:
It samples to obtain voltage value and current value by internal resistance instrument, signal is calculated divided by current value according to by voltage value
Value.
Optionally, the step of expression formula for finding out polynomial fitting includes:
The signal value that will acquire substitutes into the polynomial fitting, and the parameters of current polynomial fitting are calculated, obtain
To the complete expression of polynomial fitting；
The polynomial fitting presets expression formula are as follows:
S=A_{N}*Q^{N}+A_{N1}*Q^{N1}+...+A_{2}*Q^{2}+A_{1}*Q+A_{0}；
Wherein S is impedance, and A is calculative parameter, and Q is the signal value acquired, and the initial value of N is to be defaulted as 3.
Optionally, the signal value for reacquiring preset quantity, examining the error of the polynomial fitting is to meet to miss
The step of poor demand includes:
The sampled value that detector obtains is substituted into, the signal value error of the result and acquisition that acquire according to polynomial fitting is detected
Whether default error range is less than；
If being less than, determine that the polynomial fitting meets error requirement, otherwise determines to be unsatisfactory for error requirement.
Optionally, if the error for examining the polynomial fitting includes: after the step in default error range
If examining the error for obtaining the polynomial fitting not in default error range, change current polynomial fitting
Order forms new polynomial fitting；
After forming new polynomial fitting, the input value with order corresponding number is obtained, and it is more to reexecute digital simulation
The errorchecking step of Xiang Shiyu.
In addition, to achieve the above object, the present invention also provides a kind of internal resistance of cell computing device, the internal resistance of cell detection
Device includes: the internal resistance of cell essence that memory, processor and being stored in can be run on the memory and on the processor
True calculation procedure, the internal resistance of cell accurately calculate and realize that the internal resistance of cell as described above is accurate when program is executed by the processor
The step of calculation method.
In addition, to achieve the above object, it is described computerreadable the present invention also provides a kind of computer readable storage medium
It is stored with the internal resistance of cell on storage medium and accurately calculates program, the internal resistance of cell accurately calculates real when program is executed by processor
Now the step of internal resistance of cell Method for Accurate Calculation as described above.
Internal resistance of cell Method for Accurate Calculation and detection device of the present invention, by the way that specific polynomial fitting is being incorporated in electricity
In the program of pond internal resistance detection, cell internal resistance detector is enabled to increase substantially the detection accuracy of the internal resistance of cell.Simultaneously
The calculation of polynomial fitting is simple, the calculating for being fitted polynomial expression formula without consuming excessive resource, therefore
By the present invention in that effectively increasing the detection accuracy of internal resistance detection instrument with the thinking of polynomial fitting optimizing detection data.
Detailed description of the invention
Fig. 1 be the hardware running environment that the embodiment of the present invention is related to terminal apparatus structure schematic diagram；
Fig. 2 is the flow diagram of internal resistance of cell Method for Accurate Calculation first embodiment of the present invention；
Fig. 3 is the distribution map of the signal value Q and practical impedance S in internal resistance of cell Method for Accurate Calculation of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
As shown in Figure 1, Fig. 1 is the terminal structure schematic diagram for the hardware running environment that the embodiment of the present invention is related to.
The terminal of that embodiment of the invention is cell internal resistance detector.
As shown in Figure 1, the terminal may include: processor 1001, such as CPU, network interface 1004, user interface
1003, memory 1005, communication bus 1002.Wherein, communication bus 1002 is for realizing the connection communication between these components.
User interface 1003 may include display screen (Display), input unit such as keyboard (Keyboard), optional user interface
1003 can also include standard wireline interface and wireless interface.Network interface 1004 optionally may include that the wired of standard connects
Mouth, wireless interface (such as WIFI interface).Memory 1005 can be high speed RAM memory, be also possible to stable memory
(nonvolatile memory), such as magnetic disk storage.Memory 1005 optionally can also be independently of aforementioned processor
1001 storage device.
It will be understood by those skilled in the art that the restriction of the not structure paired terminal of terminal structure shown in Fig. 1, can wrap
It includes than illustrating more or fewer components, perhaps combines certain components or different component layouts.
As shown in Figure 1, as may include that operating system, network are logical in a kind of memory 1005 of computer storage medium
Letter module, Subscriber Interface Module SIM and the internal resistance of cell accurately calculate program.
In terminal shown in Fig. 1, network interface 1004 is mainly used for connecting background server, carries out with background server
Data communication；User interface 1003 is mainly used for connecting client (user terminal), carries out data communication with client；And processor
1001 can be used for that the internal resistance of cell stored in memory 1005 is called to accurately calculate program, and execute following operation:
The signal value of preset quantity is obtained, and the signal value is substituted into default polynomial fitting, it is multinomial to find out fitting
The expression formula of formula；
The signal value for obtaining preset quantity is reacquired, examining the error of the polynomial fitting is to meet error requirement；
If inspection obtains the polynomial fitting and meets error requirement, the polynomial fitting is loaded onto internal resistance and calculates journey
In sequence.
Further, processor 1001 can call the internal resistance of cell stored in memory 1005 to accurately calculate program, also
Execute following operation:
It samples to obtain voltage value and current value by internal resistance instrument, signal is calculated divided by current value according to by voltage value
Value.
Further, processor 1001 can call the internal resistance of cell stored in memory 1005 to accurately calculate program, also
Execute following operation:
The signal value that will acquire substitutes into the polynomial fitting, and the parameters of current polynomial fitting are calculated, obtain
To the complete expression of polynomial fitting；
The polynomial fitting presets expression formula are as follows:
S=A_{N}*Q^{N}+A_{N1}*Q^{N1}+...+A_{2}*Q^{2}+A_{1}*Q+A_{0}；
Wherein S is impedance, and A is calculative parameter, and Q is the signal value acquired, and the initial value of N is to be defaulted as 3.
Further, processor 1001 can call the internal resistance of cell stored in memory 1005 to accurately calculate program, also
Execute following operation:
The sampled value that detector obtains is substituted into, the signal value error of the result and acquisition that acquire according to polynomial fitting is detected
Whether default error range is less than；
If being less than, determine that the polynomial fitting meets error requirement, otherwise determines to be unsatisfactory for error requirement.
Further, processor 1001 can call the internal resistance of cell stored in memory 1005 to accurately calculate program, also
Execute following operation:
If examining the error for obtaining the polynomial fitting not in default error range, change current polynomial fitting
Order forms new polynomial fitting；
After forming new polynomial fitting, the input value with order corresponding number is obtained, and it is more to reexecute digital simulation
The errorchecking step of Xiang Shiyu.
Referring to Fig. 2, first embodiment of the invention provides a kind of internal resistance of cell Method for Accurate Calculation, and the internal resistance of cell is accurate
Calculation method includes:
Step S10 obtains the signal value of preset quantity, and the signal value is substituted into default polynomial fitting, finds out
The expression formula of polynomial fitting；
Specifically, internal resistance instrument can get the value of the voltage U and resistance I of battery by sampling, according to whole circuit ohm
Law can calculate resistance R=U/I, and default polynomial fitting is brought into the signal value being calculated by what sampling obtained
S=A_{N}*Q^{N}+A_{N1}*Q^{N1}+...+A_{2}*Q^{2}+A_{1}*Q+A_{0}In, Q is substituted into using signal value, in calculating parameter using known to parameter
Battery, i.e. S are known parameters, so that parameters A calculating be found out, then polynomial fitting are calculated by least square method
Complete expression.
Step S20 reacquires the signal value for obtaining preset quantity, and examining the error of the polynomial fitting is to meet to miss
Poor demand；
Specifically, after the expression for having obtained polynomial fitting, a certain number of signal values, and band are reacquired
Enter in polynomial fitting, verifies the impedance S being calculated and actual error.Error then shows to intend less than default error range
It closes multinomial and meets error requirement, otherwise determine that polynomial fitting is unsatisfactory for error requirement.
Step S30 meets error requirement if examining and obtaining the polynomial fitting, the polynomial fitting is loaded onto
In internal resistance calculation procedure.
Specifically, if the error of detection polynomial fitting can satisfy preset error requirement, make the polynomial fitting
It is used in process of measurement, for correcting the error of measured value and actual value, the measurement for improving internal resistance of cell detection is accurate
Degree.
Internal resistance of cell Method for Accurate Calculation of the present invention, by many experiments and test, find the measured value of the internal resistance of cell with
Actual value correlation in discrete set, therefore select to reduce measured value and actual value by introducing linear fit
Error.When selecting fitting function, can select fitting of a polynomial, power fitting etc. a variety of fitting functions or model, the present invention in
Comprehensively consider the accuracy of detection, the factors such as applicability select polynomial fitting to be fitted.It detects to obtain one by internal resistance instrument
After the input value of fixed number amount, the expression formula of polynomial fitting can be obtained by least square method.Obtaining polynomial fitting
After expression formula, when internal resistance instrument is detected, the data sampled can be corrected by polynomial fitting, to have
Effect increases the accuracy of measurement result.
The expression of polynomial fitting in order to obtain first adopts battery using internal resistance instrument (i.e. known to parameter)
Sample obtains voltage and electric current that sampling obtains, resistance R=U/I can be calculated by whole circuit law of ohm, be calculated
Resistance, that is, internal resistance instrument output signal value.And it is updated in polynomial fitting by internal resistance parameter known to battery.It is fitted more
The order of item formula can be adjusted flexibly, and adjusting order can make polynomial fitting preferably adapt to different internal resistance instrument, experiment hair
The value of existing order can effectively meet the use demand of conventional fourwire system internal resistance instrument in 4 ranks, therefore count for convenience
It calculates, order is defaulted as 3, can increase or decrease order according to specific requirements in practical calculating process.
By the signal value of measurement observation internal resistance instrument output and the image of battery impedance (referring to Fig. 3, wherein abscissa expression
It is signal value Q, ordinate expression is practical impedance S) can be observed how signal value, there are certain to be associated with practical impedance,
The present invention uses polynomial fitting, then is capable of the relationship of intuitively accurate expression signal value and practical impedance.In actual measurement,
Input value is updated in polynomial fitting, and the deviation of the value and practical impedance that are calculated is very small, and actually uses process
In do not need carry out hardware configuration improvement, i.e., will not bring additional hardware cost.And computer is simple, polynomial fitting
Expression formula be S=A_{N}*Q^{N}+A_{N1}*Q^{N1}+...+A_{2}*Q^{2}+A_{1}*Q+A_{0}, multiple output valve Q are substituted into expression formula with corresponding S,
Then the parameters A that polynomial fitting can be found out reuses a certain number of additional input value Q and corresponding impedance S
Substitute into polynomial fitting carry out errortested (Q and S that calculating uses with Q and S that inspection uses from different points, with guarantee
The accuracy of polynomial fitting).
The present invention detects the distribution between resulting output valve and the actual value of battery impedance by theoryloaded theory internal resistance instrument
Relationship, it is breakthrough to apply to polynomial fitting in internal resistance of cell detection.Internal resistance instrument can be sampled and be obtained by polynomial fitting
It arrives, so that the measuring accuracy of internal resistance of cell instrument is improved significantly.
Further, the signal value of step S10 acquisition preset quantity includes:
Step S11 samples to obtain voltage value and current value by internal resistance instrument, calculates according to by voltage value divided by current value
To signal value.
Specifically, specifically, for the polynomial expression of digital simulation, need to substitute into signal value, signal value is
The resistance value R that internal resistance instrument samples, the electric current V of circuits where the battery both end voltage U and battery that sampled by internal resistance instrument,
R=U/I is being calculated according to whole circuit law of ohm.According to the actual situation, the measurement electricity such as temperature can be added in signal value
Amount in need of consideration when the internal resistance of pond.
Signal value is the important parameter in the present invention for calculating, and signal value is after internal resistance detection instrument detects battery
The physical quantity of offer.In general, signal value includes R value, R is resistance value, by the electricity at internal resistance detection instrument detection battery both ends
It presses U and passes through the electric current I of battery, be then calculated according to whole circuit law of ohm R=U/I.According to actual needs, signal value
Common and necessary amount in the detection of the internal resistances of cell such as temperature can also be added to be calculated, to guarantee the accuracy of calculated result.
Further, step S10 finds out the expression formula of polynomial fitting and includes:
Step S12, the signal value that will acquire substitute into the polynomial fitting, the items of current polynomial fitting are calculated
Parameter obtains the complete expression of polynomial fitting；
The polynomial fitting presets expression formula are as follows:
S=A_{N}*Q^{N}+A_{N1}*Q^{N1}+...+A_{2}*Q^{2}+A_{1}*Q+A_{0}；
Wherein S is impedance, and A is calculative parameter, and Q is the signal value acquired, and the initial value of N is to be defaulted as 3.
Specifically, it in the expression formula of polynomial fitting, is made of parameter A, signal value Q and impedance S, it is multinomial in digital simulation
When formula, the impedance using specific battery is known parameters, i.e. for S it is known that Q is the value that internal resistance instrument detects, order N is defaulted as 3.
Substituting into multiple (quantity is greater than order N) S, the value of parameter A of each rank can then be calculated with the value for corresponding to Q, to obtain complete
Expression formula.
The general expression of polynomial fitting is S=A_{N}*Q^{N}+A_{N1}*Q^{N1}+...+A_{2}*Q^{2}+A_{1}*Q+A_{0}, in order to obtain
Expression needs to calculate the location parameter Q in expression formula, by substituting into multiple groups (multiple points i.e. in image) Q and corresponding S
Value, so that it may accurately calculate the value of the parameter A of each rank.After obtaining the complete expression of polynomial fitting, so that it may will
Polynomial fitting is arranged in the process of measurement of internal resistance detector, optimizes the testing result of internal resistance detection instrument.
Further, step S20 reacquires the signal value for obtaining preset quantity, examines the error of the polynomial fitting
Being the step of meeting error requirement includes:
Step S21 substitutes into the sampled value that detector obtains, and detects the letter of the result and acquisition that acquire according to polynomial fitting
Whether number value error is less than default error range；
Step S22 determines that the polynomial fitting meets error requirement if being less than, and otherwise determines that being unsatisfactory for error needs
It asks.
Specifically, it in order to examine whether polynomial fitting can satisfy the use demand of internal resistance detection instrument, needs to fitting
Multinomial carries out errortested.Errortested needs
With a batch signal value), signal value is substituted into polynomial fitting, can in the hope of impedance, to calculate and practical impedance parameter
The error of (when calculating parameter and inspection error, using the battery for determining specification, therefore practical impedance is known parameters).Error
When error is less than default error range, show that the polynomial fitting meets the needs of internal resistance detection instrument.Error is greater than or equal to
When default error range, reselects input value and calculate new polynomial fitting.
In order to ensure polynomial fitting correctly can effectively promote the accuracy of cell internal resistance detector, it is more to obtain fitting
It also needs to carry out errortested to polynomial fitting after the complete formula of item formula.Polynomial fitting calculate when, it is possible that
The case where overfitting or poor fitting, both of which will lead to polynomial fitting in actual measurement and cannot keep higher
Accuracy.The case where in order to avoid there is overfitting and poor fitting, it is necessary first to select sufficient amount of sample when calculating, instead
It should need that multiple points is selected to be calculated that (each point is exactly the practical impedance S an of sample and the letter of internal resistance instrument in icon
Number value Q).Therefore when obtaining signal value Q with corresponding S, need to be arranged a preset quantity, to guarantee that the fitting being calculated is more
The accuracy rate of item formula.
When polynomial fitting calculates, default order is 3 ranks, in practice, in order to improve the calculating speed of program, is intended
Polynomial order is closed to need to reduce as far as possible.Therefore default order meet error requirement when, can to polynomial fitting into
Row simplifies processing, and the essence for simplifying processing is to reduce the order of polynomial fitting.The specific steps are reduce order, then again
Error is calculated, if polynomial fitting still meets error requirement after order is reduced, using current polynomial fitting as best
Polynomial fitting use.If polynomial fitting is unable to satisfy error requirement after order is reduced, polynomial fitting uses upper
One order is most simple polynomial fitting, then be used directly 1 rank multinomial when order is 1 rank and meets error requirement.Example
If 3 rank multinomials meet error requirement, then order is set as 2, errortested is carried out again, meets error requirement, then continues
Order is reduced, is unsatisfactory for then using 3 ranks.The reduction of order can effectively reduce the calculating time of program, thus to calculate when
Between demand it is higher when, simplifying processing and improve calculating speed to polynomial fitting can be passed through.
When examining the error of polynomial fitting, need using new (different from when calculating) input value Q and corresponding resistance
Anti S tests, i.e., different points is tested in figure.Examine data (i.e. the corresponding data in figure midpoint) quantity for using can be with
Less than quantity when calculating, but it also must satisfy certain quantitative requirement.The discriminant approach of error can there are many, such as make
With the percentage shared in actual value of the absolute difference between result and actual value, or directly using the exhausted of the two difference
To value etc..The result being finally calculated is in default error range, then shows that the polynomial fitting can satisfy internal resistance
Polynomial fitting is added in the test software of internal resistance detection instrument, is corrected to detection data by the use demand of detector.
Further, step S30 internal resistance of cell Method for Accurate Calculation, which is characterized in that the inspection obtains the fitting
Multinomial met after the step of error requirement
Step S40 changes current quasi if examining the error for obtaining the polynomial fitting not in default error range
Polynomial order is closed, new polynomial fitting is formed；
Step S41 after forming new polynomial fitting, obtains the input value with order corresponding number, and reexecute meter
Calculate polynomial fitting and errorchecking step.
Specifically, it if detection obtains polynomial fitting and is unsatisfactory for error requirement, needs to recalculate polynomial fitting,
In order to further increase the accuracy of polynomial fitting, when recalculating, modify (originally to the order of polynomial fitting
To increase order in invention, 1) specially order adds.Then the polynomial fitting newly obtained substitute into ask and participate in error inspection
The calculating tested, calculation method are constant with process.
By the order of adjusting polynomial fitting, the demand of unused cell internal resistance detector can be flexibly coped with, thus
It allows the invention to be effectively used in the internal resistance of cell instrument of different size, so that the internal resistance based on polynomial fitting is accurately surveyed
The scope of application of amount method is more extensive.
Furthermore the embodiment of the present invention also proposes a kind of computer readable storage medium.
It is stored with the internal resistance of cell on computer readable storage medium of the present invention and accurately calculates program, the internal resistance of cell is accurate
The step of internal resistance of cell Method for Accurate Calculation as described above is realized when calculation procedure is executed by processor.
Wherein, the display program of the prompt information run on the processor is performed realized method and can refer to
The each embodiment of internal resistance of cell Method for Accurate Calculation of the present invention, details are not described herein.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to nonrow
His property includes, so that the process, method, article or the system that include a series of elements not only include those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or system institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do
There is also other identical elements in the process, method of element, article or system.
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
Through the above description of the embodiments, those skilled in the art can be understood that abovedescribed embodiment side
Method can be realized by means of software and necessary general hardware platform, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on this understanding, technical solution of the present invention substantially in other words does the prior art
The part contributed out can be embodied in the form of software products, which is stored in one as described above
In storage medium (such as ROM/RAM, magnetic disk, CD), including some instructions are used so that terminal device (it can be mobile phone,
Computer, server, air conditioner or network equipment etc.) execute method described in each embodiment of the present invention.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (7)
1. a kind of internal resistance of cell Method for Accurate Calculation, which is characterized in that the internal resistance of cell Method for Accurate Calculation includes following step
It is rapid:
The signal value of preset quantity is obtained, and the signal value is substituted into default polynomial fitting, finds out polynomial fitting
Expression formula；
The signal value for obtaining preset quantity is reacquired, examining the error of the polynomial fitting is to meet error requirement；
If inspection obtains the polynomial fitting and meets error requirement, the polynomial fitting is loaded onto internal resistance calculation procedure
In.
2. internal resistance of cell Method for Accurate Calculation as described in claim 1, which is characterized in that the signal for obtaining preset quantity
The step of value includes:
It samples to obtain voltage value and current value by internal resistance instrument, signal value is calculated divided by current value according to by voltage value.
3. internal resistance of cell Method for Accurate Calculation as described in claim 1, which is characterized in that the table for finding out polynomial fitting
Include: up to the step of formula
The signal value that will acquire substitutes into the polynomial fitting, and the parameters of current polynomial fitting are calculated, are intended
Close polynomial complete expression；
The polynomial fitting presets expression formula are as follows:
S=A_{N}*Q^{N}+A_{N1}*Q^{N1}+...+A_{2}*Q^{2}+A_{1}*Q+A_{0}；
Wherein S is impedance, and A is calculative parameter, and Q is the signal value acquired, and the initial value of N is to be defaulted as 3.
4. internal resistance of cell Method for Accurate Calculation as described in claim 1, which is characterized in that the reacquisition preset quantity
Signal value, the error for examining the polynomial fitting, which is the step of meeting error requirement, includes:
The sampled value that detector obtains is substituted into, whether is the signal value error of result and acquisition that detection is acquired according to polynomial fitting
Less than default error range；
If being less than, determine that the polynomial fitting meets error requirement, otherwise determines to be unsatisfactory for error requirement.
5. internal resistance of cell Method for Accurate Calculation as described in claim 1, which is characterized in that if described examine the fitting multinomial
The error of formula includes: after the step in default error range
If examining the error for obtaining the polynomial fitting not in default error range, change current polynomial fitting rank
Number, forms new polynomial fitting；
After forming new polynomial fitting, the input value with order corresponding number is obtained, and reexecute digital simulation multinomial
With errorchecking step.
6. a kind of internal resistance of cell computing device, which is characterized in that the internal resistance of cell detection device includes: memory, processor
And it is stored in the internal resistance of cell that can be run on the memory and on the processor and accurately calculates program, the internal resistance of cell
It accurately calculates and realizes that the internal resistance of cell as described in any one of claims 1 to 5 is accurately counted when program is executed by the processor
The step of calculation method.
7. a kind of computer readable storage medium, which is characterized in that be stored in battery on the computer readable storage medium
Resistance accurately calculates program, and the internal resistance of cell, which accurately calculates, to be realized when program is executed by processor as any in claim 1 to 5
The step of internal resistance of cell Method for Accurate Calculation described in item.
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