CN108051755A - Battery internal resistance acquisition method and device, battery management system and computer storage readable medium - Google Patents
Battery internal resistance acquisition method and device, battery management system and computer storage readable medium Download PDFInfo
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- CN108051755A CN108051755A CN201711328083.7A CN201711328083A CN108051755A CN 108051755 A CN108051755 A CN 108051755A CN 201711328083 A CN201711328083 A CN 201711328083A CN 108051755 A CN108051755 A CN 108051755A
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- internal resistance
- remaining capacity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/3644—Constructional arrangements
- G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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Abstract
The embodiment of the invention provides a method and a device for acquiring internal resistance of a battery, a battery management system and a computer storage readable medium, and relates to the technical field of batteries. In one aspect, embodiments of the present invention detect the internal resistance of the battery in response to the battery being in a high-rate charge-discharge state by detecting whether the battery is in the high-rate charge-discharge state, where the high-rate charge-discharge state is a charge state exceeding a rated rate or a discharge state exceeding the rated rate. When the battery is in a high-rate charge-discharge state, the influence of the charge-discharge rate and the historical working conditions on the internal resistance of the battery is small, so that the accuracy of the internal resistance of the battery acquired in the use process of the battery can be improved to a certain extent.
Description
【Technical field】
The present invention relates to battery technology field more particularly to a kind of internal resistance of cell acquisition methods and device, battery management systems
System and computer storage readable medium.
【Background technology】
The internal resistance of cell is one of important parameter of reaction cell performance, available for estimating battery aging status.
Under normal circumstances, in use, the internal resistance of cell can be subject to the factors such as history operating mode, charge-discharge magnification to battery
It influences, wherein, charge-discharge magnification refers to the ratio of charging and discharging currents value and the rated capacity of battery.
However, in the prior art, when obtaining the internal resistance of cell, do not consider influence of any factor to the internal resistance of cell, this
Just the accuracy for causing the internal resistance of cell got during battery use is relatively low.
【The content of the invention】
In view of this, an embodiment of the present invention provides a kind of internal resistance of cell acquisition methods and device, battery management system with
And computer storage readable medium, to solve the accurate of the internal resistance of cell got in the prior art during battery use
Spend the problem of relatively low.
In a first aspect, an embodiment of the present invention provides a kind of internal resistance of cell acquisition methods, battery management system is implemented in, institute
The method of stating includes：
The battery is detected whether in high rate charge-discharge state, the high rate charge-discharge state is more than specified times
The charged state of rate or the discharge condition more than specified multiplying power；
High rate charge-discharge state is in response to the battery, detects the internal resistance of the battery.
Aspect as described above and any possible realization method, it is further provided a kind of realization method detects the electricity
The internal resistance in pond, including：
In the first sampling instant, the first electric current in the first voltage value and the battery at the battery both ends is obtained respectively
Value, and obtain first open-circuit voltage values of the battery in first sampling instant；
According to the first voltage value, the first current value and the first open-circuit voltage values, the internal resistance of the battery is obtained.
Aspect as described above and any possible realization method, it is further provided a kind of realization method obtains the electricity
Pond first sampling instant the first open-circuit voltage values, including：
Obtain first remaining capacity and first temperature of the battery in first sampling instant；
According to first remaining capacity of first remaining capacity and the battery at a temperature of described first with
The correspondence of open-circuit voltage values obtains first open-circuit voltage values of the battery in first sampling instant.
Aspect as described above and any possible realization method, it is further provided a kind of realization method, according to described the
One voltage value, the first current value and the first open-circuit voltage values, obtain the internal resistance of the battery, including：
By the business obtained by the difference divided by first current value of the first voltage value and first open-circuit voltage values
Absolute value, the internal resistance as the battery.
Aspect as described above and any possible realization method, it is further provided a kind of realization method, according to described the
One voltage value, the first current value and the first open-circuit voltage values, after the internal resistance for obtaining the battery, the method further includes：
According to first remaining capacity and default at least one remaining capacity section, determine that described first is remaining
Remaining capacity section where electricity；
The corresponding remaining capacity section preserved where first remaining capacity, first temperature and the battery
Internal resistance.
Aspect as described above and any possible realization method, it is further provided a kind of realization method, the method is also
Including：
Obtain the corresponding temperature of internal resistance of the battery detected；
When the second remaining capacity meets specified requirements, according to the battery got at a temperature of at least two in
Any two internal resistance and relation formula lnR=a/T+b in resistance, determine a and b；
It will determine a and b lnR=a/T+b, the internal resistance as the temperature under second remaining capacity and the battery
Correspondence；
Wherein, the R is the internal resistance of battery, and a is the first parameter, and the b is the second parameter, and the T is temperature.
Aspect as described above and any possible realization method, it is further provided a kind of realization method detects the electricity
The internal resistance in pond, including：
Obtain assigned temperature；
According to the correspondence and the specified temperature of the temperature under second remaining capacity and the internal resistance of the battery
Degree, obtains the internal resistance of the battery under the assigned temperature.
Aspect as described above and any possible realization method, it is further provided a kind of realization method, the method is also
Including：
According to second remaining capacity and default at least one remaining capacity section, determine that described second is remaining
Remaining capacity section where electricity；
Corresponding remaining capacity section, the assigned temperature and the specified temperature preserved where second remaining capacity
The internal resistance of the battery under degree.
Second aspect, an embodiment of the present invention provides a kind of computers to store readable medium, including：Computer can perform finger
Order, following steps are performed when the computer executable instructions are run：
The battery is detected whether in high rate charge-discharge state, the high rate charge-discharge state is more than specified times
The charged state of rate or the discharge condition more than specified multiplying power；
High rate charge-discharge state is in response to the battery, detects the internal resistance of the battery.
The third aspect, an embodiment of the present invention provides a kind of internal resistance of cell acquisition device, described device includes：
First detection module, for whether detecting the battery in high rate charge-discharge state, the big multiplying power charge and discharge
Electricity condition is the charged state more than specified multiplying power or the discharge condition more than specified multiplying power；
Second detection module for being in high rate charge-discharge state in response to the battery, detects the interior of the battery
Resistance.
Fourth aspect, the embodiment of the present invention additionally provide a kind of battery management system, and the system comprises in above-mentioned battery
Hinder acquisition device.
A technical solution in above-mentioned technical proposal has the advantages that：
In the embodiment of the present invention, whether the battery is detected in high rate charge-discharge state, the high rate charge-discharge
State is the charged state more than specified multiplying power or the discharge condition more than specified multiplying power, and big multiplying power is in response to the battery
Charging and discharging state detects the internal resistance of the battery.
Wherein, the size of the internal resistance of battery, with the movement velocity of the various ions in battery and the distribution of various ions
Situation is related, and the movement velocity of various ions and the distribution situation of various ions, with history operating mode and charge-discharge magnification
Etc. factors it is related, if charge-discharge magnification be no more than specified multiplying power, in temperature, remaining capacity and identical charge-discharge magnification, no
With under history operating mode, the distribution situation difference of the movement velocity of various ions and various ions is larger, obtains in this case
Internal resistance of cell difference under the different history operating modes arrived is larger, if charge-discharge magnification is more than specified multiplying power, in temperature, remaining capacity
And current value in battery it is identical when, under different history operating modes, the distribution of the movement velocity of various ions and various ions
Situation difference is smaller, and the internal resistance of cell difference under the different history operating modes got in this case is smaller, then in big multiplying power
During charging and discharging state, charge-discharge magnification and influence of the history operating mode to the internal resistance of cell are smaller.In the embodiment of the present invention, battery it is interior
Resistance obtains under high rate charge-discharge state, therefore, improves got during battery use to a certain extent
The internal resistance of cell accuracy.
【Description of the drawings】
It in order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the present invention, for this field
For those of ordinary skill, without having to pay creative labor, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is the flow diagram for the internal resistance of cell acquisition methods that the embodiment of the present invention is provided；
Under same remaining capacity that Fig. 2 is provided by the embodiment of the present invention, same temperature, different history operating modes, battery
The graph of relation that internal resistance changes with charge-discharge magnification；
Under the conditions of the identical high rate charge-discharge that Fig. 3 is provided by the embodiment of the present invention, at each temperature, the internal resistance of battery with
The curve relation figure of remaining capacity variation；
Under the conditions of the identical high rate charge-discharge that Fig. 4 is provided by the embodiment of the present invention, under each remaining capacity, battery it is interior
Hinder the graph of relation varied with temperature；
Fig. 5 is the structure diagram of internal resistance of cell acquisition device provided in an embodiment of the present invention；
Fig. 6 is the structure diagram of battery management system provided in an embodiment of the present invention.
【Specific embodiment】
For a better understanding of the technical solution of the present invention, the embodiment of the present invention is retouched in detail below in conjunction with the accompanying drawings
It states.
It will be appreciated that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art obtained without creative efforts it is all its
Its embodiment, belongs to the scope of protection of the invention.
The term used in embodiments of the present invention is only merely for the purpose of description specific embodiment, and is not intended to be limiting
The present invention.In the embodiment of the present invention and " one kind " of singulative used in the attached claims, " described " and "the"
It is also intended to including most forms, unless context clearly shows that other meanings.
It should be appreciated that term "and/or" used herein is only a kind of incidence relation for describing affiliated partner, represent
There may be three kinds of relations, for example, A and/or B, can represent：Individualism A, exists simultaneously A and B, individualism B these three
Situation.In addition, character "/" herein, it is a kind of relation of "or" to typically represent forward-backward correlation object.
It will be appreciated that though temperature may be described using term first, second, third, etc. in embodiments of the present invention,
But these temperature should not necessarily be limited by these terms.These terms are only used for temperature being distinguished from each other out.For example, the present invention is not being departed from
In the case of scope of embodiments, the first temperature can also be referred to as second temperature, and similarly, second temperature can also be referred to as
One temperature.
Depending on linguistic context, word as used in this " if " can be construed to " ... when " or " when ...
When " or " in response to determining " or " in response to detection ".Similarly, depending on linguistic context, phrase " if it is determined that " or " if detection
(condition or event of statement) " can be construed to " when definite " or " in response to determining " or " when the detection (condition of statement
Or event) when " or " in response to detecting (condition or event of statement) ".
The embodiment of the present invention provides a kind of battery acquisition methods, and this method is implemented in battery management system, with reference to figure 1,
By the flow diagram for the method that the embodiment of the present invention provides, as shown in Figure 1, this method comprises the following steps：
Step 101, whether the battery is detected in high rate charge-discharge state.
Step 102, high rate charge-discharge state is in response to the battery, detects the internal resistance of the battery.
High rate charge-discharge state can be the charged state more than specified multiplying power or the discharge condition more than specified multiplying power, i.e.,
Rate of charge is more than the charged state of specified multiplying power or discharge-rate is more than the discharge condition of specified multiplying power.Wherein, rate of charge
Refer to the ratio of charging current and the rated capacity of battery, discharge-rate refers to the ratio of the rated capacity of discharge current and battery
Value, specified multiplying power refer to the ratio of rated current and the rated capacity of battery.
Battery will not be in charged state and discharge condition simultaneously, and therefore, whether detection battery is in the charge and discharge of big multiplying power
Whether electricity condition is detection battery in fact in big multiplying power charged state or big multiplying power discharging state.In addition, performing step
Before 101, battery can be also detected according to prefixed time interval whether in charging and discharging state, i.e., is detected according to prefixed time interval
Whether battery is in charged state or discharge condition, and above-mentioned prefixed time interval can be arbitrary time span, such as 1S or 10S
Deng.
It should be noted that if battery is in high rate charge-discharge state, step 102 is performed, otherwise, step can be re-executed
Rapid 101.
The size of the internal resistance of battery has with the movement velocity of the various ions in battery and the distribution situation of various ions
It closes, and the movement velocity of various ions and the distribution situation of various ions, with the factors such as history operating mode and charge-discharge magnification
It is related, if charge-discharge magnification is no more than specified multiplying power, in temperature, remaining capacity and identical charge-discharge magnification, different history
Under operating mode, the distribution situation difference of the movement velocity of various ions and various ions is larger, gets in this case not
It is larger with the internal resistance of cell difference under history operating mode, if charge-discharge magnification is more than specified multiplying power, in temperature, remaining capacity and electricity
When current value in pond is identical, under different history operating modes, the distribution situation phase of the movement velocity of various ions and various ions
Difference is smaller, and the internal resistance of cell difference under the different history operating modes got in this case is smaller, then in high rate charge-discharge
During state, charge-discharge magnification and influence of the history operating mode to the internal resistance of cell are smaller.For example, as shown in Fig. 2, Fig. 2 is same residue
Under electricity, same temperature, different history operating mode, graph of relation that the internal resistance of battery changes with charge-discharge magnification.In Fig. 2, go through
History operating mode 1~4 is four kinds of different history operating modes, as shown in Figure 2, with the increase of rate of charge, under each history operating mode, together
The internal resistance difference of battery under one charge-discharge magnification is less and less, when charge-discharge magnification is no more than 1.5 multiplying power, same charge and discharge
Multiplying power, the internal resistance of battery under different history operating mode are different, when charge-discharge magnification is more than 1.5 multiplying power, same charge-discharge magnification,
The internal resistance of battery under different history operating modes is to the same as essentially identical.
In another implement scene, high rate charge-discharge state can also be the charge and discharge that charge-discharge magnification is more than predetermined threshold value
Electricity condition.Type, model or the attribute of battery are different, and predetermined threshold value is just different, and under normal circumstances, which can be prior
It is obtained by testing.What specifically, for a certain battery, can in advance detect under charge-discharge magnification, under each history operating mode
Battery internal resistance it is essentially identical, using this charge-discharge magnification detected as predetermined threshold value.
It has introduced after what is called high rate charge-discharge state, the two kinds of realization methods of internal resistance for obtaining battery is described below：
The first realization method：In the first sampling instant, the first voltage value and battery that obtain battery both ends respectively
First current value, and first open-circuit voltage values of the battery in the first sampling instant are obtained, according to the first voltage value, the first current value
And first open-circuit voltage values, obtain the internal resistance of battery.
In order to enable reader is easier to understand internal resistance of cell acquisition methods provided in an embodiment of the present invention, introduce how root
According to the first voltage value, the first current value and the first open-circuit voltage values, before the internal resistance for obtaining battery, first is first introduced below and is adopted
Sample moment, the first open-circuit voltage values and how to obtain the first open-circuit voltage values：
First sampling instant can be any time in high rate charge-discharge state.Under normal circumstances, battery is opened just
During beginning charge or discharge, the first voltage value and the first current value potentially unstable, the first voltage value at this moment got and first
Current value may be inaccurate,, can in the embodiment of the present invention in order to get more accurately the first voltage value and the first current value
The first voltage value and the first current value are gathered again after when high rate charge-discharge state continues one section, for example, can be in big multiplying power
Charging and discharging state continues 10S post-samplings or sampling etc. at the end of high rate charge-discharge state.
First open-circuit voltage values refer to terminal voltage value when battery is in open circuit.Under normal circumstances, it is to be in battery
The first open-circuit voltage values of battery are obtained during open-circuit condition, but, in embodiments of the present invention, battery is in the first sampling instant
High rate charge-discharge state is in, if disconnecting circuit obtains the first open-circuit voltage values this moment, closed circuit where battery is just
It can not work.
In order to avoid the generation of the above situation, the first open-circuit voltage values can be obtained by the following method：
First remaining capacity and first temperature of the battery in the first sampling instant are obtained, according to the first remaining capacity, with
And battery the first remaining capacity at the first temperature and the correspondence of open-circuit voltage values, battery is obtained in the first sampling instant
The first open-circuit voltage values.
Open-circuit voltage values are related with remaining capacity and temperature, and under different temperatures and different remaining capacities, same battery is opened
Road voltage value is different.Wherein, remaining capacity refers to the percentage of the available power of battery and the specified electric quantity of battery.
Wherein, in the embodiment of the present invention, the first remaining capacity of battery at the first temperature can be obtained by the following method
With the correspondence of open-circuit voltage values：
Different remaining capacity difference can be obtained in advance when battery is in open-circuit condition, respectively at different temperature
Corresponding open-circuit voltage values, then preserve each temperature, each remaining capacity at each temperature and with each remaining electricity at each temperature
Measure the correspondence of corresponding open-circuit voltage values.After getting the first remaining capacity and the first temperature, it can preserve in advance
Each temperature, each remaining capacity at each temperature and corresponding with the corresponding open-circuit voltage values of each remaining capacity at each temperature
In relation, the first remaining capacity pair at a temperature of the first remaining capacity and first at a temperature of the first temperature, first is selected
The correspondence for the open-circuit voltage values answered, and first the remaining at the first temperature using this correspondence selected as battery
The correspondence of remaining electricity and open-circuit voltage values.
Introduce finish the first sampling instant, the first open-circuit voltage values and the first open-circuit voltage values acquisition methods it
Afterwards, how it is described below according to the first voltage value, the first current value and the first open-circuit voltage values, obtains the internal resistance of battery：
By the absolute value of the business obtained by the difference divided by the first current value of the first voltage value and the first open-circuit voltage values, make
For the internal resistance of battery.
Wherein, the formula of asking for of the internal resistance of battery is：
R is the internal resistance of battery, and U is the first voltage value, and OCV is the first open-circuit voltage values, and I is the first current value.
It should be noted that under same temperature and remaining capacity, when battery is in charged state, in the first sampling instant
The first voltage value got, the first open-circuit voltage got when being in discharge condition more than battery in the first sampling instant
Value；When battery is in discharge condition, in the first voltage value that the first sampling instant is got, when being in discharge condition less than battery
In the first open-circuit voltage values that the first sampling instant is got.In addition, in order to distinguish the first current value got, be on earth
Battery is in being got during charged state or is got when battery is in discharge condition, can will be in and fill in battery
The current value collected during electricity condition is as the first current value, by the negative of the current value collected when battery is in discharge condition
Number is as the first current value, will be alternatively, using the current value collected when battery is in discharge condition as the first current value
Battery is in the negative of the current value collected during charged state as the first current value.If it follows that directly by the first electricity
Business of the pressure value obtained by with the difference of the first open-circuit voltage values divided by the first current value, if the internal resistance as battery, the battery
Internal resistance may be negative, in order to avoid this case, just by the first voltage value and the difference divided by first of the first open-circuit voltage values
The absolute value of business obtained by current value, the internal resistance as battery.
When battery is in high rate charge-discharge state, under same charge-discharge magnification, at a certain temperature, a certain remaining capacity
The corresponding internal resistance of cell of remaining capacity in section, does not change with the variation of remaining capacity.For example, as shown in figure 3, Fig. 3 is
In high rate charge-discharge state, in same charge-discharge magnification, under different temperatures, what the internal resistance of battery changed with remaining capacity
Relation curve.In Fig. 3, at 45 DEG C, the internal resistance of battery does not change substantially with the variation of remaining capacity；35℃、25℃、20℃、
At 15 DEG C, 10 DEG C, 5 DEG C and 0 DEG C, the internal resistance of battery first reduces with the increase of remaining capacity, then with remaining capacity
Increase and it is constant.So from the figure 3, it may be seen that at any temperature, there is a situation where the internal resistance that multiple remaining capacities correspond to a battery,
Remaining capacity can so be divided into different remaining capacity sections, in same remaining capacity section, the internal resistance of battery is identical, no
In same remaining capacity section, the internal resistance of battery is different.For example, at 45 DEG C, the internal resistance of battery is not substantially with the change of remaining capacity
Change and change, remaining capacity can be divided into a remaining capacity section [0%, 100%], it is each surplus in the remaining capacity section
The internal resistance of the corresponding battery of remaining electricity is identical；It is each surplus in remaining capacity section [30%, 100%] at 35 DEG C, 25 DEG C and 15 DEG C
The internal resistance of the corresponding battery of remaining electricity is identical；At 5 DEG C and 0 DEG C, each remaining capacity in remaining capacity section [50%, 100%]
The internal resistance of corresponding battery is identical；At 10 DEG C, the corresponding battery of each remaining capacity in remaining capacity section [60%, 100%]
Internal resistance it is identical；At 20 DEG C, the internal resistance of the corresponding battery of each remaining capacity in remaining capacity section [80%, 100%] is identical.
In high rate charge-discharge state, under same charge-discharge magnification, same temperature, same remaining capacity, get
Battery internal resistance, just can be used for assessment battery degree of aging.From the foregoing, it can be understood that battery is in high rate charge-discharge state
When, under same charge-discharge magnification, at a certain temperature, the internal resistance of the corresponding battery of multiple remaining capacities is identical, then can will
The corresponding multiple remaining capacities of internal resistance of identical battery are divided into same remaining capacity section, will be in high rate charge-discharge state
In, under same charge-discharge magnification, same temperature, same remaining capacity section, the internal resistance of the battery got, for assessing electricity
The degree of aging in pond.
It so, can be according to the first remaining capacity and default at least one remaining capacity after the internal resistance of battery is received
Section determines the remaining capacity section where the first remaining capacity, the corresponding remaining capacity area preserved where the first remaining capacity
Between, the internal resistance of the first temperature and the battery, for the degree of aging of further evaluation battery.Wherein, one first remaining electricity
Amount section can correspond at least one first temperature, and at least one first temperature can correspond to the internal resistance of a battery, the correspondence
Reference can be made to table 1.In table 1, first remaining capacity section corresponds to three temperature, these three temperature correspond to the interior of battery
Resistance.
Table 1
Second of realization method：It charges in big multiplying power or greatly during multiplying power discharging, it can be according in any prior art
The method for obtaining the internal resistance of cell obtains the internal resistance of battery.
For example, it during the charging of big multiplying power or big multiplying power discharging optionally for a period of time, obtains in this time, battery two
The maximum voltage value and minimum amount of voltage that at end, and the maximum current value and minimum current value of battery are obtained, it is obtained according to following formula
Take the internal resistance of battery：
R1For the internal resistance of battery, UmaxFor maximum voltage value, UminFor minimum amount of voltage that, ImaxFor maximum current value, IminFor
Minimum current value.
Under normal circumstances, the internal resistance of the battery under same remaining capacity meets Arrhenius formula lnR=a/T with temperature
+ b, under different remaining capacities, a, b may be identical, it is also possible to which different, this is related with the self attributes of battery.For example, such as Fig. 4 institutes
Show, Fig. 4 is under high rate charge-discharge state, and under same charge-discharge magnification, different remaining capacities, the internal resistance of battery becomes with temperature
The graph of relation of change.The internal resistance of the battery under any remaining capacity and the correspondence curve of temperature are directed to, by the curve
Arrhenius formula lnR=a/T+b can be got after fitting.
Since the internal resistance of the battery under same remaining capacity meets Arrhenius formula lnR=a/T+b with temperature, then
After the step 102 that is finished, the internal resistance of battery under same remaining capacity and the correspondence of temperature can be also established, after being used for
The continuous internal resistance according to the Relation acquisition battery.
Specifically, after step 102 is performed, the corresponding temperature of internal resistance of the battery detected can be obtained, it is remaining second
When electricity meets specified requirements, according to any two internal resistance of the battery got in the internal resistance at a temperature of at least two, with
And relation formula lnR=a/T+b, it determines a and b, the lnR=a/T+b of a and b will be determined, as the temperature under the second remaining capacity
Degree and the correspondence of the internal resistance of battery, wherein, R is the internal resistance of battery, and a is the first parameter, and b is the second parameter, and T is temperature.
Above-mentioned second remaining capacity, when can be the internal resistance that any time obtains battery, the remaining capacity of the battery detected.The
Two remaining capacities meet specified requirements, can be that the second remaining capacity is to specify remaining capacity.Wherein, above-mentioned relation formula is upper
The Arrhenius formula referred in text.A and b is unknown quantity, by the battery got under same second remaining capacity at least
Any two internal resistance in internal resistance and corresponding temperature at two temperature are brought into above-mentioned relation formula, can get two
First linear function group, and then a and b can be solved.
After above-mentioned correspondence is got, assigned temperature is obtained, according to the temperature under the second remaining capacity and battery
The correspondence and assigned temperature of internal resistance obtain the internal resistance of battery under assigned temperature.Battery under the assigned temperature got
Internal resistance be to specify the internal resistance of remaining capacity, battery under assigned temperature.
It should be noted that due to battery gradual aging in use, the internal resistance of cell and temperature in same battery
Correspondence may change, then can the second remaining electricity be updated according to the internal resistance of the newest battery got twice
Amount, the internal resistance of battery under second temperature and the correspondence of temperature, as far as possible so that the accuracy of the internal resistance of cell got
It is higher.
In addition, from the foregoing, it can be understood that the battery got under different time, same remaining capacity section, same temperature it is interior
Resistance, just can be used for assessment battery degree of aging, then, can also after the internal resistance of the battery under getting assigned temperature, according to
Second remaining capacity and default at least one remaining capacity section, determine the remaining capacity area where the second remaining capacity
Between, the internal resistance of battery, is used under the remaining capacity section, assigned temperature and assigned temperature where the second remaining capacity of corresponding preservation
In the degree of aging of further evaluation battery.
In addition, the embodiment of the present invention also provides a kind of computer storage readable medium, including：Computer executable instructions,
Following steps are performed when the computer executable instructions are run：
The battery is detected whether in high rate charge-discharge state, the high rate charge-discharge state is more than specified times
The charged state of rate or the discharge condition more than specified multiplying power；
High rate charge-discharge state is in response to the battery, detects the internal resistance of the battery.
The embodiment of the present invention also provides a kind of internal resistance of cell acquisition device 200, structure diagram such as Fig. 5 institutes of the device
Show, described device includes：
First detection module 201, for whether detecting the battery in high rate charge-discharge state, the big multiplying power is filled
Discharge condition is the charged state more than specified multiplying power or the discharge condition more than specified multiplying power.
Second detection module 202 for being in high rate charge-discharge state in response to the battery, detects the battery
Internal resistance.
Method shown in FIG. 1 is able to carry out by each module in device in this present embodiment, the present embodiment is not retouched in detail
The part stated can refer to the related description to Fig. 1.
The embodiment of the present invention also provides a kind of battery management system 300, and referring to Fig. 6, Fig. 6 is that the structure of the system 300 is shown
It is intended to, which includes above-mentioned internal resistance of cell acquisition device 200.
The technical solution of the embodiment of the present invention has the advantages that：
The size of the internal resistance of battery has with the movement velocity of the various ions in battery and the distribution situation of various ions
It closes, and the movement velocity of various ions and the distribution situation of various ions, with the factors such as history operating mode and charge-discharge magnification
It is related, if charge-discharge magnification is no more than specified multiplying power, in temperature, remaining capacity and identical charge-discharge magnification, different history
Under operating mode, the distribution situation difference of the movement velocity of various ions and various ions is larger, gets in this case not
It is larger with the internal resistance of cell difference under history operating mode, still, if charge-discharge magnification is more than specified multiplying power, in temperature, remaining capacity
And current value in battery it is identical when, under different history operating modes, the distribution of the movement velocity of various ions and various ions
Situation difference is smaller, and the internal resistance of cell difference under the different history operating modes got in this case is smaller, then in big multiplying power
During charging and discharging state, charge-discharge magnification and influence of the history operating mode to the internal resistance of cell are smaller.In the embodiment of the present invention, battery it is interior
Resistance obtains under high rate charge-discharge state, therefore, improves got during battery use to a certain extent
The internal resistance of cell accuracy.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit may be referred to the corresponding process in preceding method embodiment, and details are not described herein.
In several embodiments provided by the present invention, it should be understood that disclosed system, apparatus and method can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit
Division is only a kind of division of logic function, can have other dividing mode in actual implementation, for example, multiple units or group
Part may be combined or can be integrated into another system or some features can be ignored or does not perform.It is another, it is shown
Or the mutual coupling, direct-coupling or communication connection discussed can be by some interfaces, device or unit it is indirect
Coupling or communication connection can be electrical, machinery or other forms.
The unit illustrated as separating component may or may not be physically separate, be shown as unit
The component shown may or may not be physical location, you can be located at a place or can also be distributed to multiple
In network element.Some or all of unit therein can be selected to realize the mesh of this embodiment scheme according to the actual needs
's.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also
That unit is individually physically present, can also two or more units integrate in a unit.Above-mentioned integrated list
The form that hardware had both may be employed in member is realized, can also be realized in the form of hardware adds SFU software functional unit.
The above-mentioned integrated unit realized in the form of SFU software functional unit, can be stored in one and computer-readable deposit
In storage media.Above-mentioned SFU software functional unit is stored in a storage medium, is used including some instructions so that a computer
It is each that device (can be personal computer, server or network equipment etc.) or processor (Processor) perform the present invention
The part steps of embodiment the method.And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only memory (Read-
Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disc or CD etc. it is various
The medium of program code can be stored.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God and any modification, equivalent substitution, improvement and etc. within principle, done, should be included within the scope of protection of the invention.
Claims (11)
1. a kind of internal resistance of cell acquisition methods, which is characterized in that battery management system is implemented in, the described method includes：
The battery is detected whether in high rate charge-discharge state, the high rate charge-discharge state is more than specified multiplying power
Charged state or the discharge condition more than specified multiplying power；
High rate charge-discharge state is in response to the battery, detects the internal resistance of the battery.
2. the method as described in claim 1, which is characterized in that the internal resistance of the battery is detected, including：
In the first sampling instant, the first current value in the first voltage value and the battery at the battery both ends is obtained respectively,
And obtain first open-circuit voltage values of the battery in first sampling instant；
According to the first voltage value, the first current value and the first open-circuit voltage values, the internal resistance of the battery is obtained.
3. method as claimed in claim 2, which is characterized in that obtain the battery in first sampling instant first opens
Road voltage value, including：
Obtain first remaining capacity and first temperature of the battery in first sampling instant；
According to first remaining capacity of first remaining capacity and the battery at a temperature of described first and open circuit
The correspondence of voltage value obtains first open-circuit voltage values of the battery in first sampling instant.
4. method as claimed in claim 2, which is characterized in that according to the first voltage value, the first current value and first
Open-circuit voltage values obtain the internal resistance of the battery, including：
By the exhausted of the business obtained by the difference divided by first current value of the first voltage value and first open-circuit voltage values
To value, the internal resistance as the battery.
5. method as claimed in claim 3, which is characterized in that according to the first voltage value, the first current value and first
Open-circuit voltage values, after the internal resistance for obtaining the battery, the method further includes：
According to first remaining capacity and default at least one remaining capacity section, first remaining capacity is determined
The remaining capacity section at place；
The corresponding remaining capacity section preserved where first remaining capacity, first temperature and the battery it is interior
Resistance.
6. the method as described in claim 1, which is characterized in that the method further includes：
Obtain the corresponding temperature of internal resistance of the battery detected；
When the second remaining capacity meets specified requirements, according to the battery got in the internal resistance at a temperature of at least two
Any two internal resistance and relation formula lnR=a/T+b, determine a and b；
The lnR=a/T+b of a and b will be determined, as the temperature under second remaining capacity and pair of the internal resistance of the battery
It should be related to；
Wherein, the R is the internal resistance of battery, and a is the first parameter, and the b is the second parameter, and the T is temperature.
7. method as claimed in claim 6, which is characterized in that the internal resistance of the battery is detected, including：
Obtain assigned temperature；
According to the correspondence of the temperature under second remaining capacity and the internal resistance of the battery and the assigned temperature,
Obtain the internal resistance of the battery under the assigned temperature.
8. the method for claim 7, which is characterized in that the method further includes：
According to second remaining capacity and default at least one remaining capacity section, second remaining capacity is determined
The remaining capacity section at place；
Under remaining capacity section, the assigned temperature and the assigned temperature where corresponding preservation second remaining capacity
The internal resistance of the battery.
9. a kind of computer stores readable medium, which is characterized in that including：Computer executable instructions, when the computer can be held
Row instruction performs following steps when being run：
The battery is detected whether in high rate charge-discharge state, the high rate charge-discharge state is more than specified multiplying power
Charged state or the discharge condition more than specified multiplying power；
High rate charge-discharge state is in response to the battery, detects the internal resistance of the battery.
10. a kind of internal resistance of cell acquisition device, which is characterized in that described device includes：
First detection module, for whether detecting the battery in high rate charge-discharge state, the high rate charge-discharge shape
State is the charged state more than specified multiplying power or the discharge condition more than specified multiplying power；
Second detection module for being in high rate charge-discharge state in response to the battery, detects the internal resistance of the battery.
11. a kind of battery management system, which is characterized in that the system comprises the internal resistance of cell as claimed in claim 10 acquisitions
Device.
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