CN109799459A - Test method, test device and the storage medium of lithium ion power battery core power - Google Patents
Test method, test device and the storage medium of lithium ion power battery core power Download PDFInfo
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Abstract
Present invention discloses a kind of method, test device and storage mediums for testing lithium ion power battery core power, it include: that the power battery core to be measured is subjected to charge/discharge under multiple and different power with constant initial voltage, and current value when measuring corresponding initial current value and t；According to the relational expression of the power and the initial current value fitting power and initial current value；Assuming that being Px to power scale, then corresponding initial current value Ix is calculated according to the relational expression；According to current value when two performance numbers P1, P2 and its corresponding initial current value and t in the plurality of different performance number and theoretical voltage value Utx, power P x to be measured is calculated according to formula and the relational expression.The method for the test lithium ion power battery core power that this Shen provides, is detected, and then release the calculation formula of power by the power arbitrarily set, realizes and rapidly and accurately test power battery core power, save a large amount of human resources and material resources.
Description
Technical field
The present invention relates to power battery fields, especially relate to a kind of side for testing lithium ion power battery core power
Method, test device and storage medium.
Background technique
With the development of lithium ion battery, lithium ion power battery core is widely applied to electric car (EV), and electric vehicle is divided into
Pure electric automobile (BEV), plug-in hybrid electric automobile (PHEV), mixed power electric car (HEV)；Power battery
Operating power is its important performance indicator, especially HEV battery core, and the size of operating power is particularly important.
The method of detection battery operating power mainly passes through examination power test at present, the number tested in the detection process
More, test is more complex, and during multiple test, temperature and state-of-charge the SOC (power battery i.e. to be measured of battery core
The ratio of remaining electricity and full charge) it can change, the power of detection is easy to be affected, the result precision of test
It is not high.
Summary of the invention
The main object of the present invention is to provide a kind of method, test device and storage for testing lithium ion power battery core power
Medium realizes rapid survey power battery core power.
The main object of the present invention is to provide a kind of method for testing lithium ion power battery core power, comprising:
Power battery core to be measured is subjected to charge/discharge, and measurement pair under multiple and different power with constant initial voltage
The current value when initial current value and t answered；
According to the relational expression of the power and the initial current value fitting power and initial current value；
Assuming that being Px to power scale, then corresponding initial current value Ix is calculated according to the relational expression；
When according to two performance numbers P1, P2 and its corresponding initial current value and t in the plurality of different performance number
Power P x to be measured is calculated according to formula and the relational expression in current value and theoretical voltage value Utx.
Further, two performance numbers P1, P2 according in the plurality of different performance number and its it is corresponding just
Beginning current value and current value and theoretical voltage value Utx when t, the step of power P x to be measured is calculated according to formula, comprising:
The corresponding initial current value I2 of current value It1 when initial current value I1 and t that performance number P1 is corresponding, performance number P2
The formula is substituted into the current value It2 when t and theoretical voltage value Utx to obtain:
The performance number Px to be measured is calculated further according to the relational expression.
Further, two performance numbers P1, P2 according in the plurality of different performance number and its it is corresponding just
Current value It1, It2 and theoretical voltage value Utx, is calculated according to relational expression to power scale when beginning current value I1, I2 and t
After the step of Px, comprising:
One or many two different power are separately taken in the plurality of different power, and detect corresponding initial electricity
Flow valuve and current value when t；
Keep the theoretical value Utx constant, it will be electric when described two different power and its corresponding initial current value and t
Flow valuve correspondence is brought into the formula, and power P x2, Px3 ... Pxn to be measured is calculated, and wherein n is the integer more than or equal to 2；
Calculate all average values to power scale；
The average value is determined as the actual value to power scale.
Further, two performance numbers P1, P2 according in the plurality of different performance number and its it is corresponding just
Current value It1, It2 and theoretical voltage value Utx, is calculated according to relational expression to power scale when beginning current value I1, I2 and t
After the step of Px, comprising:
Charge/discharge is carried out to the power battery core to be measured with the performance number Px to be measured being calculated according to the formula, and
Detect voltage value Ut when t；
Whether voltage value Ut when judging the t is in the range of the blanking voltage of the battery core to be measured；
If so, determining that the performance number Px to be measured being calculated is the actual value to power scale；
If it is not, error amount is then calculated and be shown.
Further, described if it is not, after the step of error amount is then calculated and be shown, comprising:
Theoretical voltage value Utx2 is reset according to error amount；
Current value is constant when keeping two performance numbers P1, P2 and its corresponding initial current value and t, passes through the formula meter
Calculation obtains performance number P2x to be measured.
Further, described if it is not, after the step of error is then calculated and be shown, comprising:
When resetting multiple and different power according to error amount to discharge, and measuring corresponding initial current value and t
Current value, and return it is described according to the relational expression of the power and the current value fitting power and initial current value the step of；
It recalculates to obtain performance number P3x to be measured.
Further, the relational expression according to the power and the initial current value fitting power and initial current value
The step of, comprising:
The relational expression of linear function fitting power and initial current value is used according to the power and the initial current value.
Present invention also provides a kind of test device, including memory and processor, the memory is stored with computer
The step of program, the processor realizes any of the above-described the method when executing the computer program.
It further, further include the display unit coupled with the processor, the display unit is for showing described answer
With the application interface of program.
The embodiment of the present application also provides a kind of storage medium, is stored thereon with computer program, the computer program quilt
The step of processor realizes method described in any of the above embodiments when executing.
The method for the test peak power that this Shen provides, is detected by the power arbitrarily set, and then releases power
Calculation formula, realize rapidly and accurately test power battery core power, save a large amount of human resources and material resources.
Detailed description of the invention
Fig. 1 is the flow diagram of the method for the test lithium ion power battery core power of one embodiment of the application；
Fig. 2 is that the process in the method for the test lithium ion power battery core power of one embodiment of the application after step S4 is shown
It is intended to；
Fig. 3 is the structural block diagram of the test device of one embodiment of the application；
Fig. 4 is the structural block diagram of the storage medium of one embodiment of the application.
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.
Referring to Fig.1, the present invention provides a kind of methods for testing lithium ion power battery core power, comprising:
S1: power battery core to be measured is subjected to charge/discharge under multiple and different power with constant initial voltage, and is measured
Corresponding initial current value and current value when t；
S2: according to the relational expression of the power and the initial current value fitting power and initial current value；
S3: assuming that being Px to power scale, then corresponding initial current value Ix is calculated according to the relational expression；
S4: according to two performance numbers P1, P2 and its corresponding initial current value and t in the plurality of different performance number
When current value and theoretical voltage value Utx, power P x to be measured is calculated according to formula and the relational expression.
As described in above-mentioned steps S1, power battery core to be measured fill with constant initial voltage under different power/
Electric discharge keeps charge/discharge power constant since power battery core is during invariable power charge/discharge, and charge/discharge voltage can be with
The growth of discharge time first reduce and then tend towards stability, therefore can not directly measure carrying out with constant power for battery core to be measured
Charge/discharge, and voltage value when charge/discharge voltage stabilization.Therefore, it is impossible to set power according to the operating voltage of power battery core
Current value when being worth, therefore first detecting initial current value and t of multiple and different performance numbers with constant initial voltage progress charge/discharge,
It is derived according to rule, and when multiple and different power carries out the initial current value and t of charge/discharge with constant initial voltage
Current value can be obtained by measurement.Wherein be slightly over when t or be equal to power battery core to be measured by charge/discharge to stabilization
The time of charge/discharge, time when t is unsuitable too long, otherwise with power battery core long-time charge/discharge to be measured, state-of-charge
SOC (ratio of power battery remaining electricity and full charge i.e. to be measured) and temperature can all impact voltage.
As described in above-mentioned steps S2, the initial current value and power that will test, fitting power and initial current value
Relational expression, as long as the power of known input, can calculate corresponding initial current according to relational expression that is, for same battery core
Value, does not need to measure again.
As described in above-mentioned steps S3, since corresponding power can not be set according to the actual operating voltage of battery core, need more
Secondary setting power after battery core charge/discharge voltage stabilization, then measures voltage, more time-consuming, therefore can first set to measurement of power
Rate is Px, can find out its initial current value Ix according to the relational expression that step S2 is fitted.
As described in above-mentioned steps S4, it can according in the multiple power set in step sl two performance number P1,
Current value and theoretical voltage value Utx, can derive theory according to corresponding relationship when P2, corresponding initial current value and t
The corresponding power of voltage value.After wherein theoretical voltage value Utx is stable in battery core discharge process, and in the cut-off of charge/discharge
Operating voltage value in voltage range, i.e. theoretical voltage value are to meet the operating voltage value of power demand, according to formula and above-mentioned
Relational expression can calculate the operating power of power battery core to be measured.
In the present embodiment, according to two performance numbers P1, P2 in the plurality of different performance number and its corresponding initial
Current value and current value and theoretical voltage value Utx when t, the step S4 of performance number Px to be measured is calculated according to formula, comprising:
S401: the corresponding initial electricity of current value It1 when initial current value I1 and t that performance number P1 is corresponding, performance number P2
The current value It2 and theoretical voltage value Utx substitutes into the formula and obtains when flow valuve I2 and t:
S402: the performance number Px to be measured is calculated further according to relational expression.
As described in above-mentioned steps S401-S402, due to detecting corresponding multiple initial current values according to multiple performance numbers,
It can be with the relational expression of fitting power and initial current.I.e. known Px can derive Ix according to relational expression.
Secondly, during power battery core charge/discharge, extension of the charge/discharge current value with discharge time, variation
Rule be also consistent, i.e., the difference of initial current value than be equal to t when electric current difference ratio, it may be assumed that
Above-mentioned Itx is substituted into formula:
Px=Itx × Utx
It, can be pre- according to the real work situation of battery core to be measured since theoretical voltage value Utx is voltage value actually required
It first finds out, i.e., is set according to operating voltage of the blanking voltage of the electricity consumption of load to battery core to be measured, as long as meeting negative
The voltage that carrying can work normally can be as theoretical threshold voltage.Secondly, current value It1 when initial current value I1, I2 and t,
It2, which can be measured, to be come.It can be obtained:
Further according to the relational expression of Px and Ix fitting, power battery core performance number to be measured can be found out.
Referring to Fig. 2, in the present embodiment, two performance numbers P1, P2 according in the plurality of different performance number and
Current value It1, It2 and theoretical voltage value Utx, calculates according to relational expression when its corresponding initial current value I1, I2 and t
To after the step S4 of power P x to be measured, comprising:
S501: one or many two different power are separately taken in the plurality of different power, and are detected corresponding
Initial current value and current value when t；
S502: keeping the theoretical value Utx constant, by described two different power and its corresponding initial current value and
Current value correspondence is brought into the formula when t, and power P x2, Px3 ... Pxn to be measured is calculated, and wherein n is whole more than or equal to 2
Number；
S503: all average values to power scale are calculated；
S504: the average value is determined as the actual value to power scale.
As described in above-mentioned steps S501-S504, one or many two different power are separately taken, are repeatedly calculated to measurement of power
Rate obtains power P x2, Px3 ... Pxn to be measured further according to the Px tested before and finds out average value, this average value is determined
It for the actual value to power scale, i.e., repeatedly finds out to power scale, calculates its average value, to reduce the mistake in calculating process
Difference.
In the present embodiment, two performance numbers P1, P2 according in the plurality of different performance number and its corresponding
Current value It1, It2 and theoretical voltage value Utx, are calculated according to relational expression to measurement of power when initial current value I1, I2 and t
After the step S4 of rate Px, comprising:
S511: discharge/charge are carried out to the power battery core to be measured with the performance number Px to be measured being calculated according to the formula
Electricity, and voltage value Ut when detecting t；
S512: whether voltage value Ut when judging the t is in the range of the blanking voltage of the battery core to be measured；
S513: if so, determining that the performance number Px to be measured being calculated is the actual value to power scale；
S514: if it is not, error amount is then calculated and be shown.
As described in above-mentioned steps S511, charge/discharge is carried out to power electric core to be measured according to the Px being calculated, should be managed
It solves, when calculating the power when power setting to be measured when charging is power battery core to be measured charging, and cannot be set as discharging
Power, similarly, power when electric discharge also may be only configured to power when power battery core to be measured charging, and when cannot be set as charging
Power.Detect voltage value Ut when its t.
As described in above-mentioned steps S512-S514, judge Ut whether locate in the range of the blanking voltage of battery core to be measured, according to
Judging result is being analyzed, if it is within range, it can the Px value being calculated is determined as actual performance number to be measured, no
It, can be with display error value in range.The error amount wherein shown is not absolute value, that is, the value shown can be voltage value Ut with
The difference of theoretical voltage value Utx, if voltage value Ut is greater than theoretical voltage value Utx, the difference shown is positive number, if voltage value Ut
Less than theoretical voltage value Utx, then the difference shown is negative.In another embodiment, voltage value Ut when can also calculate t is
The no error amount with theoretical voltage value Utx whether in error range, if in error range, the Px that can will be calculated
Value is determined as actual performance number to be measured；If not in error range, display error value.The error amount wherein shown is not exhausted
To value, that is, the value shown can be the difference of voltage value Ut Yu theoretical voltage value Utx, if voltage value Ut is greater than theoretical voltage value
Utx, the then difference shown are positive number, if voltage value Ut is less than theoretical voltage value Utx, the difference shown is negative.By upper
The result of calculating can be detected by stating, if the value being as a result not intended to, display error value can be made in order to testing staff
It further sets, to reduce the time of test.
It is described if it is not, being then calculated and be shown after the step S514 of error amount in the present embodiment, comprising:
S5151: theoretical voltage value Utx2 is reset according to error amount；
S5152: current value is constant when two performance numbers P1, P2 of holding and its corresponding initial current value and t, by described
Performance number P2x to be measured is calculated in formula.
As described in above-mentioned steps S5151-S5152, theoretical voltage value is reset according to error amount, even voltage value Ut is big
In theoretical voltage value Utx, then the theoretical voltage value Utx that the theoretical voltage value Utx1 reset is arranged before should being slightly less than,
If voltage value Ut is less than theoretical voltage value Utx, the reason that the theoretical voltage value Utx2 reset is arranged before should be slightly larger than
By voltage value Utx, P2x is calculated further according to the theoretical voltage value of reset, i.e., to the error for the result being calculated point
Again to setting after analysis, result can be made to be more nearly right value according to the theoretical voltage that error result is set, reduced again
Calculate still incorrect probability.
It is described if it is not, being then calculated and be shown after error amount in the present embodiment, comprising:
S5153: multiple and different power is reset according to error amount and is discharged, and measures corresponding initial current value
With current value when t, and the relational expression according to the power and the current value fitting power and initial current value is returned to
Step；
S5154: it recalculates to obtain performance number P3x to be measured.
As described in above-mentioned steps S5153-S5154, discharge/charge are carried out according to multiple and different power that error amount is reset
Electricity, that is, the performance number reset should be closer to the Px values being calculated according to theoretical voltage value Utx, further according to reset
Performance number P3x is calculated.I.e. calculated result may be the function of fitting error it is excessive, therefore by the power of reset
Value should can reduce the error of fitting function close to the Px value being calculated according to theoretical voltage value Utx, keep detection more smart
Really.
In the present embodiment, the relationship according to the power and the initial current value fitting power and initial current value
The step S2 of formula, comprising:
S201: the pass of linear function fitting power and initial current value is used according to the power and the initial current value
It is formula.
It i.e. during power battery core charge/discharge, is discharged with constant initial voltage, by P=U × I it is found that just
Beginning, voltage U was identical, and when originating charge/discharge, the time is very short, voltage change very little, Px and initial current Ix be for linear relationship,
But the rule of the electric discharge according to power battery core, linear relationship are generally Px=k × Ix+b, wherein keeping initial voltage not
In the case where change, initial current Ix and power P Cheng Yici relational expression, wherein k and b is constant, system and initial electricity by battery core
Pressure determines.It should be appreciated that other functions can also be fitted to according to multiple power, in the case where guaranteeing that error range is little,
The measurement to Px may be implemented.
In one embodiment, it is above-mentioned by the power battery core to be measured under multiple and different power with constant initial electricity
When pressing and carry out charge/discharge, and measuring corresponding initial current value and t before the step S1 of current value, further includes:
S011: detecting and judges whether the temperature of the power battery to be measured is in the range of preset temperature；
S012 is if so, measure the power battery to be measured, if it is not, then adjusting the temperature of the power battery to be measured
After in the range of degree to preset temperature, then the power battery to be measured is measured.
As described in above-mentioned steps S011 and step S012, power battery to be measured is placed under preset temperature, when to be measured dynamic
The temperature of power battery measures power battery to be measured after reaching preset temperature.It is to be measured due to extraneous Different climate
During actual discharge, locating temperature is different battery.Therefore power battery can be placed on steady temperature
Under the conditions of, it when the temperature of power battery to be measured reaches constant, then is detected, can thus detect power battery to be measured in reality
Charge/discharge power in the course of work on border so that data more closing to reality value, convenient for the area for each Different climate into
Row production, or be adjusted for charge/discharge power of the Various Seasonal to power battery.
In one embodiment, it is above-mentioned by the power battery core to be measured under multiple and different power with constant initial electricity
When pressing and carry out charge/discharge, and measuring corresponding initial current value and t before the step S1 of current value, further includes:
Detect and record state-of-charge SOC (the remaining electricity of power battery i.e. to be measured and the full charge of power battery to be measured
The ratio of amount), the SOC value of detection can be big probable value, such as: 100%, 90%, 80%, 70%, 60%, 50%, 40%,
30%, 20%, 10% etc., it can be specifically arranged according to the requirement of detection.Due under the SOC value of power battery to be measured or else together
Charge/discharge power is also different, and it is therefore necessary to detect to it.In another embodiment, adjustable power to be measured
The SOC value of battery carries out detecting it and waits for power scale to different state-of-charges.
The method for the test peak power that this Shen provides, is detected by the power arbitrarily set, and then releases power
Calculation formula, realize rapidly and accurately test power battery core power, save a large amount of human resources and material resources.
Reference figure, 3, the embodiment of the present invention also provides a kind of test device, including processor 400 and memory 100, described
Memory 100 is stored with computer program 200, and the processor 400 realizes any of the above-described when executing the computer program
The step of the method.The test device of the present embodiment is that the side of lithium ion power battery core power is tested in the various embodiments described above
The carrier of method.
For ease of description, only parts related to embodiments of the present invention are shown, disclosed by specific technical details, asks
Referring to present invention method part.
Memory 100 can be used for storing software program and module, and processor is stored in the soft of memory 100 by operation
Part program and module, thereby executing the various function application and data processing of test device.Memory 100 can mainly include
Storing program area and storage data area, wherein storing program area can application journey needed for storage program area, at least one function
Sequence (such as sound-playing function, image player function etc.) etc.；Storage data area can be stored is created according to using for test device
Data (such as audio data, phone directory etc.) built etc..In addition, memory 100 may include high-speed random access memory, also
It may include nonvolatile memory, a for example, at least disk memory, flush memory device or the storage of other volatile solid-states
Device.
Input unit can be used for receiving the number or character information of input, and generate with the user setting of test device with
And the related key signals input of function control.Specifically, input unit may include touch panel and other input equipments.Touch-control
Panel, also referred to as touch screen, collecting the touch operation of user on it or nearby, (for example user is appointed using finger, stylus etc.
What operation of suitable object or attachment on touch panel or near touch panel), and driven according to preset formula
Move corresponding attachment device.Optionally, touch panel may include both touch detecting apparatus and touch controller.Wherein,
Touch detecting apparatus detects the touch orientation of user, and detects touch operation bring signal, transmits a signal to touch control
Device；Touch controller receives touch information from touch detecting apparatus, and is converted into contact coordinate, then gives processor
400, and order that processor 400 is sent can be received and executed.Furthermore, it is possible to use resistance-type, condenser type, infrared ray with
And the multiple types such as surface acoustic wave realize touch panel.In addition to touch panel, input unit can also include other input equipments.
Specifically, other input equipments can include but is not limited to physical keyboard, function key (such as volume control button, switch key
Deng), trace ball, mouse, one of operating stick etc. or a variety of.
Display unit can be used for showing information input by user or be supplied to user information and test device it is each
Kind menu, application interface of application program etc..Display unit may include display panel, optionally, can use liquid crystal display
(Liquid Crystal Display, LCD), Organic Light Emitting Diode (Organic Light-Emitting Diode,
) etc. OLED forms configure display panel.Further, touch panel can cover display panel, when touch panel detects
After touch operation on or near it, processor 400 is sent to determine the type of touch event, is followed by subsequent processing 400 basis of device
The type of touch event provides corresponding visual output on a display panel.Touch panel and display panel can be as two
Independent component realizes the input and input function of test device, can also be integrated by touch panel and display panel and realize
Test device outputs and inputs function.
Processor 400 is the control centre of test device, utilizes each of various interfaces and the entire test device of connection
A part by running or execute the software program and/or module that are stored in memory 100, and calls and is stored in storage
Data in device 100 execute the various functions and processing data of test device, to carry out integral monitoring to test device.It can
Choosing, processor 400 may include one or more processing units；Preferably, processor 400 can integrate application processor and modulation
Demodulation processor, wherein the main processing operation system of application processor, user interface and application program etc., modulation /demodulation processing
Device mainly handles wireless communication.It is understood that above-mentioned modem processor can not also be integrated into processor 400.
Test device further includes test ammeter, and test ammeter can be one or more ammeter, and ammeter includes but unlimited
In universal meter, voltmeter, ammeter etc., it is all can be used for detecting voltage and current, realize the electricity of the technical effect of this programme
Table is within the scope of protection of this application.
Referring to Fig. 4, one embodiment of the invention also provides a kind of storage medium 500, is stored thereon with computer program 200,
The method of test lithium ion power battery core power is realized when computer program 200 is executed by processor, comprising: will be described to be measured dynamic
Power battery core carries out charge/discharge under multiple and different power with constant initial voltage, and measures corresponding initial current value and t
When current value；According to the relational expression of the power and the initial current value fitting power and initial current value；Assuming that measurement of power
Rate is Px, then corresponding initial current value Ix is calculated according to the relational expression；According in the plurality of different performance number
Two performance numbers P1, P2 and its corresponding initial current value and current value and theoretical voltage value Utx when t, according to formula and
Power P x to be measured is calculated in the relational expression.
In one embodiment, two performance numbers P1, P2 according in the plurality of different performance number and its right
Current value and theoretical voltage value Utx when the initial current value and t answered, the step of power P x to be measured is calculated according to formula,
The corresponding initial current value I2 and t of current value It1 when including: initial current value I1 and t that performance number P1 is corresponding, performance number P2
When the current value It2 and theoretical voltage value Utx substitute into the formula and obtain:
The performance number Px to be measured is calculated further according to the relational expression.
In one embodiment, two performance numbers P1, P2 according in the plurality of different performance number and its right
Current value It1, It2 and theoretical voltage value Utx when initial current value I1, I2 and the t answered, according to relational expression be calculated to
After the step of power scale Px, comprising: one or many two different power are separately taken in the plurality of different power, and
Current value when detecting corresponding initial current value and t；Keep the theoretical value Utx constant, by described two different power and
Its corresponding initial current value and current value correspondence is brought into the formula when t, is calculated power P x2, Px3 ... Pxn to be measured,
Wherein n is the integer more than or equal to 2；Calculate all average values to power scale；The average value is determined as described to be measured
The actual value of power.
In one embodiment, two performance numbers P1, P2 according in the plurality of different performance number and its right
Current value It1, It2 and theoretical voltage value Utx when initial current value I1, I2 and the t answered, according to relational expression be calculated to
After the step of power scale Px, comprising: with the performance number Px to be measured that is calculated according to the formula to the power electric to be measured
Core carries out charge/discharge, and voltage value Ut when detecting t；Voltage value Ut when judging the t whether cutting in the battery core to be measured
Only in the range of voltage；If so, determining that the performance number Px to be measured being calculated is the actual value to power scale；If
It is no, then error amount is calculated and be shown.
In one embodiment, described if it is not, after the step of error amount is then calculated and be shown, comprising: according to error amount
Reset theoretical voltage value Utx2；Current value is not when keeping two performance numbers P1, P2 and its corresponding initial current value and t
Become, performance number P2x to be measured is calculated by the formula.
In one embodiment, described if it is not, after the step of error is then calculated and be shown, comprising: according to error amount weight
The multiple and different power of new settings discharges, and current value when measuring corresponding initial current value and t, and returns to the basis
The step of relational expression of the power and the current value fitting power and initial current value；It recalculates to obtain performance number to be measured
P3x。
In one embodiment, described according to the power and the initial current value fitting power and initial current value
The step of relational expression, comprising: utilize the relational expression of linear function fitting power and initial current value.
Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, the computer program can be stored in a non-volatile computer
In read/write memory medium, the computer program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein,
Any reference used in provided herein and embodiment to memory, storage, database or other media,
Including non-volatile and/or volatile memory.Nonvolatile memory may include read-only memory (ROM), programming ROM
(PROM), electrically programmable ROM (EPROM), electrically erasable ROM (EEPROM) or flash memory.Volatile memory may include
Random access memory (RAM) or external cache.By way of illustration and not limitation, RAM is available in many forms,
Such as static state RAM (SRAM), dynamic ram (DRAM), synchronous dram (SDRAM), double speed are according to rate SDRAM (SSRSDRAM), enhancing
Type SDRAM (ESDRAM), synchronization link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM
(RDRAM), direct memory bus dynamic ram (DRDRAM) and memory bus dynamic ram (RDRAM) etc..
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, device, article or the method 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, device, article or method 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, device of element, article or method.Charge/discharge two kinds of embodiments of expression, one
Testing scheme when kind for charging, it is a kind of for electric discharge when testing scheme, and the data of the two cannot be mixed, such as:
By the data application of discharge test in charging measurement or by the data application of the test of charging during discharge test.
The foregoing is merely preferred embodiment of the present application, are not intended to limit the scope of the patents of the application, all utilizations
Equivalent structure or equivalent flow shift made by present specification and accompanying drawing content is applied directly or indirectly in other correlations
Technical field, similarly include in the scope of patent protection of the application.
Claims (10)
1. a kind of method for testing lithium ion power battery core power characterized by comprising
Power battery core to be measured is subjected to charge/discharge under multiple and different power with constant initial voltage, and is measured corresponding
Initial current value and current value when t；
According to the relational expression of the power and the initial current value fitting power and initial current value；
Assuming that being Px to power scale, then corresponding initial current value Ix is calculated according to the relational expression；
According to electric current when two performance numbers P1, P2 and its corresponding initial current value and t in the plurality of different performance number
Value and theoretical voltage value Utx, are calculated power P x to be measured according to formula and the relational expression.
2. the method for test lithium ion power battery core power according to claim 1, which is characterized in that described according to
Current value and theoretical electricity when two performance numbers P1, P2 and its corresponding initial current value and t in multiple and different performance numbers
Pressure value Utx, the step of power P x to be measured is calculated according to formula, comprising:
The corresponding initial current value I2 and t of current value It1 when initial current value I1 and t that performance number P1 is corresponding, performance number P2
When the current value It2 and theoretical voltage value Utx substitute into the formula and obtain:
The performance number Px to be measured is calculated further according to the relational expression.
3. the method for test lithium ion power battery core power according to claim 1, which is characterized in that described according to
Two performance numbers P1, P2 in multiple and different performance numbers and its current value when corresponding initial current value I1, I2 and t
It1, It2 and theoretical voltage value Utx, after the step of power P x to be measured is calculated according to relational expression, comprising:
One or many two different power are separately taken in the plurality of different power, and detect corresponding initial current value
With current value when t；
Keep the theoretical value Utx constant, by current value when described two different power and its corresponding initial current value and t
Correspondence is brought into the formula, and power P x2, Px3 ... Pxn to be measured is calculated, and wherein n is the integer more than or equal to 2；
Calculate all average values to power scale；
The average value is determined as the actual value to power scale.
4. the method for test lithium ion power battery core power according to claim 1, which is characterized in that described according to
Two performance numbers P1, P2 in multiple and different performance numbers and its current value when corresponding initial current value I1, I2 and t
It1, It2 and theoretical voltage value Utx, after the step of power P x to be measured is calculated according to relational expression, comprising:
Charge/discharge is carried out to the power battery core to be measured with the performance number Px to be measured being calculated according to the formula, and detects t
When voltage value Ut；
Whether voltage value Ut when judging the t is in the range of the blanking voltage of the battery core to be measured；
If so, determining that the performance number Px to be measured being calculated is the actual value to power scale；
If it is not, error amount is then calculated and be shown.
5. the method for test lithium ion power battery core power according to claim 4, which is characterized in that described if it is not, then
After the step of error amount is calculated and be shown, comprising:
Theoretical voltage value Utx2 is reset according to error amount；
Current value is constant when keeping two performance numbers P1, P2 and its corresponding initial current value and t, is calculated by the formula
To performance number P2x to be measured.
6. the method for test lithium ion power battery core power according to claim 4, which is characterized in that described if it is not, then
After the step of error is calculated and be shown, comprising:
Electric current when resetting multiple and different power according to error amount to discharge, and measuring corresponding initial current value and t
Value, and return it is described according to the relational expression of the power and the current value fitting power and initial current value the step of；
It recalculates to obtain performance number P3x to be measured.
7. the method for test lithium ion power battery core power according to claim 1, which is characterized in that described according to
The step of relational expression of power and the initial current value fitting power and initial current value, comprising:
The relational expression of linear function fitting power and initial current value is used according to the power and the initial current value.
8. a kind of test device, which is characterized in that including memory and processor, the memory is stored with computer program,
The step of processor realizes any one of claims 1 to 7 the method when executing the computer program.
9. test device according to claim 7, which is characterized in that further include the display list coupled with the processor
Member, the display unit are used to show the application interface of the application program.
10. a kind of storage medium, is stored thereon with computer program, which is characterized in that the computer program is held by processor
The step of any one of claim 1 to 7 the method is realized when row.
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