CN103197257A - Method and device for detecting state of health (SOH) of battery - Google Patents
Method and device for detecting state of health (SOH) of battery Download PDFInfo
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- CN103197257A CN103197257A CN2013101158022A CN201310115802A CN103197257A CN 103197257 A CN103197257 A CN 103197257A CN 2013101158022 A CN2013101158022 A CN 2013101158022A CN 201310115802 A CN201310115802 A CN 201310115802A CN 103197257 A CN103197257 A CN 103197257A
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Abstract
The invention discloses a method and a device for detecting a state of health (SOH) of a battery. The method includes the steps: an absorption capacity value or a discharge capacity value in any capacity interval in the process of normal charging or discharging of the battery is monitored; a current battery actual capacity value in the capacity interval is acquired through computation by utilizing the capacity value; and the specific value of the SOH of the battery is computed by utilizing the current battery actual capacity value and a battery rated capacity value. The device can detect the SOH of the battery by utilizing the method. According to the method and the device for detecting the SOH of the battery, the absorption capacity value or the discharge capacity value in a characteristic capacity interval in the process of normal charging or discharging of the battery is monitored to detect the battery current actual capacity value and the specific value of the SOH so as to detect the SOH of the battery, average and effectiveness of the battery actual capacity values and the specific value of the SOH are judged for a plurality of times to improve detection accuracy, and therefore detection of the SOH of the battery is achieved effectively.
Description
Technical field
The present invention relates to the battery technology field, relate in particular to a kind of cell health state detection method and device.
Background technology
At present; flourish along with electric motor car, energy storage field; monitoring and protection for battery performance also more and more obtain paying attention to; voltage, electric current, temperature, single electric core consistance etc. realize already; battery charge state SOC (State Of Health) has realized high-precision prediction, and cell health state SOH (State Of Health) and the high-precision forecast of residual capacity become the problem that the next one must be broken through.Described cell health state SOH ratio, i.e. the number percent of the current actual capacity value of battery and rated capacity value, natch, under the situation of cells known rated capacity value, the current actual capacity value of battery can reflect the health status of battery equally.Described battery charge state SOC, its numerical value show as the number percent of the current charged capacity of battery and current actual capacity.
The method of existing prediction battery SOH mainly contains internal resistance method (conductance method), fully electric discharge, electric discharge etc. in short-term.
Described internal resistance method is directly to pass through the testing apparatus of specialty, measures the internal resistance of cell (electricity is led), and the distribution of analysis to measure value is predicted cell health state SOH.Yet, itself can not reflect the capacity status of current battery fully internal resistance (electricity is led), internal resistance (electricity is led) is judged to unusual battery still may exhibits excellent on capacity, and measured value is relevant with probe contact condition etc., the measurement result difference of different testing apparatuss, repdocutbility is relatively poor, so internal resistance method in general (conductance method) is implemented simply, still the cell health state SOH error of prediction is bigger.
Described complete electric discharge is that battery is discharged fully, directly calculate the current capacity of battery, and with rated capacity relatively, draw cell health state SOH, the risk that the station is arranged when the method accuracy of predicting height, but its shortcoming is and need discharges fully to battery, online power backup, and test interval is longer, can not in time find the sudden decay of battery.
Described electric discharge in short-term is mainly used in ups system, online battery is carried out discharge in short-term about 5 minutes, by voltage drop, the data such as internal resistance that calculate, estimate the capacity when its integral body is discharged fully, the method has been evaded the power down risk of discharge fully.But its shortcoming is for for the purpose of website power backup safety, and discharge time must be short as far as possible, causes estimation precision to be difficult to guarantee.
Summary of the invention
The embodiment of the invention provides a kind of high precision, short interval, need not cell health state detection method and the device of artificial discharge.
First aspect provides the cell health state detection method, and described method comprises:
SOC between arbitrary capacity region in monitoring battery charge or the discharge process
tThe interior capability value C that absorbs or discharge
n
Utilize described capability value C
n, SOC between described capacity region
t, calculate the current actual capacity value of battery C
r
In first kind of first aspect possible implementation, calculate the current actual capacity value of battery C
rShi Liyong formula C
r=C
n÷ SOC
tCalculate.
In second kind of first aspect possible implementation, SOC between arbitrary capacity region in the described monitoring battery charge and discharge process
tThe interior capability value C that absorbs or discharge
nStep further comprise:
To battery charge or the SOC between arbitrary capacity region that discharges
tProcess periodically measure, record the current value I in each cycle P
p, utilize formula C
p=P * I
pCalculate the capability value C that absorbs or discharge in each cycle P
p, to SOC between capacity region
tThe capability value C in interior all cycles
pCarry out accumulation calculating and obtain SOC between capacity region
tThe interior capability value C that absorbs or discharge
n
In the third possible implementation of first aspect, SOC between arbitrary capacity region in the described monitoring battery charge and discharge process
tThe interior capability value C that absorbs or discharge
nStep further comprise:
To battery charge or the SOC between arbitrary capacity region that discharges
tProcess periodically measure, record the current value I in each cycle P
pWith battery temperature value T, T determines the battery temperature COEFFICIENT K according to the battery temperature value
T, utilize formula C
p=P * K
T* I
pCalculate the capability value C that absorbs or discharge in each cycle P
p, to SOC between capacity region
tThe capability value C in interior all cycles
pCarry out accumulation calculating and obtain SOC between capacity region
tThe interior capability value C that absorbs or discharge
n
In the 4th kind of possible implementation of first aspect, SOC between arbitrary capacity region in the described monitoring battery charge and discharge process
tThe interior capability value C that absorbs or discharge
nStep further comprise:
To battery charge or the SOC between arbitrary capacity region that discharges
tProcess periodically measure, record the current value I in each cycle P
p, according to current value I
pDetermine battery multiplying power COEFFICIENT K
C, utilize formula C
p=P * K
C* I
pCalculate the capability value C that absorbs or discharge in each cycle P
p, to SOC between capacity region
tThe capability value C in interior all cycles
pCarry out accumulation calculating and obtain SOC between capacity region
tThe interior capability value C that absorbs or discharge
n
In the 5th kind of possible implementation of first aspect, SOC between arbitrary capacity region in the described monitoring battery charge and discharge process
tThe interior capability value C that absorbs or discharge
nStep further comprise:
To battery charge or the SOC between arbitrary capacity region that discharges
tProcess periodically measure, record the current value I in each cycle P
pWith battery temperature value T, T determines the battery temperature COEFFICIENT K according to the battery temperature value
T, according to current value I
pDetermine battery multiplying power COEFFICIENT K
C, utilize formula C
p=P * K
C* K
T* I
pCalculate the capability value C that absorbs or discharge in each cycle P
p, to SOC between capacity region
tThe capability value C in interior all cycles
pCarry out accumulation calculating and obtain SOC between capacity region
tThe interior capability value C that absorbs or discharge
n
In the 6th kind of possible implementation of first aspect, described detection method is calculating the current actual capacity value of battery C
rFurther comprising the steps of afterwards: as repeatedly to monitor and calculate the current actual capacity value of several batteries C
r, to the current actual capacity value of described several batteries C
rThe value of averaging is calculated or is carried out effective value earlier and judge that again the value of averaging calculates the mean value C of the current actual capacity of battery
Re
In the 7th kind of possible implementation of first aspect, described detection method is calculating the mean value C of the current actual capacity of battery
ReFurther comprising the steps of afterwards: the mean value C that utilizes the current actual capacity of battery
Re, and battery rated capacity value C
0, utilize formula S OH
e=C
Re÷ C
0Calculate the mean value SOH of cell health state SOH ratio
e
In the 8th kind of possible implementation of first aspect, described detection method is calculating the current actual capacity value of battery C
rFurther comprising the steps of afterwards: as to utilize the current actual capacity value of battery C
r, and battery rated capacity value C
0, utilize formula S OH=C
r÷ C
0Calculate cell health state SOH ratio.
In the 9th kind of possible implementation of first aspect, described detection method is further comprising the steps of after calculating cell health state SOH ratio: repeatedly monitor and calculate several cell health states SOH ratio, described several cell health states SOH ratio value of averaging is calculated or carried out effective value earlier and judge that again the value of averaging calculates the mean value SOH of cell health state SOH ratio
e
Second aspect the invention provides a kind of cell health state pick-up unit, comprises capacity monitoring modular and actual capacity value computing module; Described capacity monitoring modular is used for SOC between monitoring battery charge or the arbitrary capacity region of discharge process
tThe interior capability value C that absorbs or discharge
nDescribed actual capacity value computing module is used for utilizing described capability value C
n, SOC between described capacity region
t, calculate the current actual capacity value of battery C
r
In first kind of second aspect possible implementation, described actual capacity value computing module is by formula C
r=C
n÷ SOC
tCalculate the current actual capacity value of battery C
r
In second kind of second aspect possible implementation, described capacity monitoring modular comprises current value collecting unit and computing unit, and described current value collecting unit is used for measuring the current value I in each cycle P
p, described computing unit is used for utilizing formula C
p=P * I
pCalculate the capability value C that absorbs or discharge in each cycle P
p, to SOC between capacity region
tThe capability value C in interior all cycles
pCarry out accumulation calculating and obtain SOC between capacity region
tThe interior capability value C that absorbs or discharge
n
In the third possible implementation of second aspect, described capacity monitoring modular comprises current value collecting unit, temperature sensor, battery temperature coefficient determining unit and computing unit, and described current value collecting unit is used for measuring the current value I in each cycle P
p, described temperature sensor is used for measuring the battery temperature value T in each cycle P, and described battery temperature coefficient determining unit is used for determining the battery temperature COEFFICIENT K according to battery temperature value T
T, described computing unit is used for utilizing formula C
p=P * K
T* I
pCalculate the capability value C that absorbs or discharge in each cycle P
p, to SOC between capacity region
tThe capability value C in interior all cycles
pCarry out accumulation calculating and obtain SOC between capacity region
tThe interior capability value C that absorbs or discharge
n
In the 4th kind of possible implementation of second aspect, described capacity monitoring modular comprises current value collecting unit, battery times rate coefficient determining unit and computing unit, and described current value collecting unit is used for measuring the current value I in each cycle P
p, described battery times rate coefficient determining unit is used for according to current value I
pDetermine battery multiplying power COEFFICIENT K
C, described computing unit is used for utilizing formula C
p=P * K
C* I
pCalculate the capability value C that absorbs or discharge in each cycle P
p, to SOC between capacity region
tThe capability value C in interior all cycles
pCarry out accumulation calculating and obtain SOC between capacity region
tThe interior capability value C that absorbs or discharge
n
In the 5th kind of possible implementation of second aspect, described capacity monitoring modular comprises current value collecting unit, temperature sensor, battery temperature coefficient determining unit, battery times rate coefficient determining unit and computing unit, and described current value collecting unit is used for measuring the current value I in each cycle P
p, described temperature sensor is used for measuring the battery temperature value T in each cycle P, and described battery temperature coefficient determining unit is used for determining the battery temperature COEFFICIENT K according to battery temperature value T
T, described battery times rate coefficient determining unit is used for according to current value I
pDetermine battery multiplying power COEFFICIENT K
C, described computing unit is used for utilizing formula C
p=P * K
C* K
T* I
pCalculate the capability value C that absorbs or discharge in each cycle P
p, to SOC between capacity region
tThe capability value C in interior all cycles
pCarry out accumulation calculating and obtain SOC between capacity region
tThe interior capability value C that absorbs or discharge
n
In the 6th kind of possible implementation of second aspect, described pick-up unit also comprises the mean value calculation module of a current actual capacity of battery, is used for repeatedly monitoring and calculating the current actual capacity value of several batteries C
r, to the current actual capacity value of described several batteries C
rThe value of averaging is calculated or is carried out effective value earlier and judge that again the value of averaging calculates the mean value C of the current actual capacity of battery
Re
In the 7th kind of possible implementation of second aspect, described pick-up unit also comprises the mean value SOH of first a cell health state SOH ratio
eComputing module is for the mean value C that utilizes the current actual capacity of battery
Re, and battery rated capacity value C
0, utilize formula S OH
e=C
Re÷ C
0Calculate the mean value SOH of cell health state SOH ratio
e
In the 8th kind of possible implementation of second aspect, described pick-up unit also comprises a cell health state SOH ratio calculation module, is used for utilizing the current actual capacity value of battery C
r, and battery rated capacity value C
0, utilize formula S OH=C
r÷ C
0Calculate cell health state SOH ratio.
In the 9th kind of possible implementation of second aspect, described pick-up unit also comprises the mean value SOH of second a cell health state SOH ratio
eComputing module, be used for repeatedly monitoring and calculating several cell health states SOH ratio, to described several cell health states SOH ratio value of averaging calculate or carry out earlier the effective value judgement again the value of averaging calculate the mean value SOH of cell health state SOH ratio
e
In the embodiment of the invention, detect the current actual capacity value of battery and SOH ratio by the capacity that absorbs or discharge between the feature capacity region in the monitoring battery normal charge and discharge process, and can judge the raising accuracy of detection by the average and validity of battery actual capacity value and SOH ratio repeatedly.Each charging or discharge can be upgraded once, can effectively prevent short-term battery bust.Because the battery in the testing process need not artificial forced electric discharge for normal circulation.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the principle schematic of the cell health state detection method of the embodiment of the invention;
Fig. 2 is the schematic flow sheet of first kind of cell health state detection method of the embodiment of the invention;
Fig. 3 is the schematic flow sheet of second kind of cell health state detection method of the embodiment of the invention;
Fig. 4 is the schematic flow sheet of the third cell health state detection method of the embodiment of the invention;
Fig. 5 is the structural representation of first kind of cell health state pick-up unit of the embodiment of the invention;
Fig. 6 is the structural representation of first kind of capacity monitoring modular of the embodiment of the invention;
Fig. 7 is the structural representation of second kind of capacity monitoring modular of the embodiment of the invention;
Fig. 8 is the structural representation of the third capacity monitoring modular of the embodiment of the invention;
Fig. 9 is the structural representation of the 4th kind of capacity monitoring modular of the embodiment of the invention;
Figure 10 is the structural representation of second kind of cell health state pick-up unit of the embodiment of the invention;
Figure 11 is the structural representation of the third cell health state pick-up unit of the embodiment of the invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for explanation the present invention, but are not used for limiting the scope of the invention.
Fig. 1 is the principle schematic of cell health state detection method of the present invention, and as shown in Figure 1, horizontal ordinate is the battery SOC state, and ordinate is cell voltage, and L1 is charging curve, and L2 is discharge curve, SOC
1Be the state-of-charge value of monitoring starting point, SOC
2Monitoring terminal point state-of-charge value, SOC
1And SOC
2Between the interval be SOC
t, capability value is C
nThe present invention can be by SOC between a certain capacity region in the monitoring battery normal charge and discharge cycles process
tThe interior absorption or release capability value C
nVariation, take all factors into consideration factors such as temperature coefficient and times rate coefficient, calculate the current actual capacity value of battery or health status SOH ratio.
As shown in Figure 2, the cell health state detection method of one embodiment of the present of invention may further comprise the steps:
S1: SOC between arbitrary capacity region in monitoring battery charge or the discharge process
tThe interior capability value C that absorbs or discharge
n
S2: utilize described capability value C
n, SOC between described capacity region
t, calculate the current actual capacity value of battery C
r
In step S2, calculate the current actual capacity value of battery C
rThe time can utilize formula C
r=C
n÷ SOC
tCalculate.
SOC between described capacity region
tBe battery detection starting point state-of-charge value SOC
1With monitoring terminal point state-of-charge value SOC
2Difference, when battery charge, SOC
2Greater than SOC
1, SOC
t=SOC
2– SOC
1When battery discharge, SOC
2Less than SOC
1, SOC
t=SOC
1– SOC
2SOC between described capacity region
tCan choose bigger scope as far as possible according to the practical application scene, to bring higher computational accuracy, generally should be greater than 50%.
In one embodiment of the invention, described step S1 may further comprise the steps:
To battery charge or the SOC between arbitrary capacity region that discharges
tProcess periodically measure, record the current value I in each cycle P
p, utilize formula C
p=P * I
pCalculate the capability value C that absorbs or discharge in each cycle P
p, to SOC between capacity region
tThe capability value C in interior all cycles
pCarry out accumulation calculating and obtain SOC between capacity region
tThe interior capability value C that absorbs or discharge
n
In order to improve accuracy of detection or for the bigger battery of capacity temperature influence, in one embodiment of the invention, described step S1 may further comprise the steps:
To battery charge or the SOC between arbitrary capacity region that discharges
tProcess periodically measure, record the current value I in each cycle P
pWith battery temperature value T, T determines the battery temperature COEFFICIENT K according to the battery temperature value
T, utilize formula C
p=P * K
T* I
pCalculate the capability value C that absorbs or discharge in each cycle P
p, to SOC between capacity region
tThe capability value C in interior all cycles
pCarry out accumulation calculating and obtain SOC between capacity region
tThe interior capability value C that absorbs or discharge
n
Described cycle P can come as required to determine that the battery cycle P value bigger for the capacity temperature influence is as far as possible little, to obtain more high precision.Described battery temperature COEFFICIENT K
TBe the influence coefficient of battery temperature to the battery actual capacity, its value is generally under the battery Current Temperatures actual capacity value and standard temperature (being generally 25 degrees centigrade) ratio of actual capacity value, i.e. K down
T=C
TR/ C
0, described C
TRBe actual capacity value under the Current Temperatures, described C
0Be actual capacity value under the standard temperature.In practical operation, can test in a large number all types of batteries and obtain the battery temperature COEFFICIENT K of such battery under different temperatures
TThe table of comparisons, during use according to determining the battery temperature COEFFICIENT K near temperature respective value in the table of comparisons of battery actual temperature
T
In like manner, in order to improve accuracy of detection or to be subjected to the charge-discharge magnification (ratio of size of current when being battery charging and discharging for capacity, be generally the ratio of charging and discharging currents and battery rated capacity) influence bigger battery, in one embodiment of the invention, described step S1 may further comprise the steps:
To battery charge or the SOC between arbitrary capacity region that discharges
tProcess periodically measure, record the current value I in each cycle P
p, according to current value I
pDetermine battery multiplying power COEFFICIENT K
C, utilize formula C
p=P * K
C* I
pCalculate the capability value C that absorbs or discharge in each cycle P
p, to SOC between capacity region
tThe capability value C in interior all cycles
pCarry out accumulation calculating and obtain SOC between capacity region
tThe interior capability value C that absorbs or discharge
n
Described cycle P can come as required to determine that it is as far as possible little to be subjected to charge-discharge magnification to influence bigger battery cycle P value for capacity, to obtain more high precision.Described battery multiplying power COEFFICIENT K
CBe the ratio of actual capacity value under actual capacity value and the standard charge-discharge magnification under the different charge-discharge magnifications of battery, i.e. K
C=C
CR/ C
0, described C
CRBe actual capacity value under the current charge-discharge magnification, C
0Be actual capacity value under the standard charge-discharge magnification.In practical operation, can test in a large number all types of batteries and obtain the battery multiplying power COEFFICIENT K of such battery under different charge-discharge magnifications
CThe table of comparisons, during use according to determining battery multiplying power COEFFICIENT K near the interior charge-discharge magnification respective value of the table of comparisons of the actual charge-discharge magnification of battery
C
Natch, in order to improve accuracy of detection or to be subjected to temperature and charge-discharge magnification to influence bigger battery for capacity, in one embodiment of the invention, described step S1 may further comprise the steps:
To battery charge or the SOC between arbitrary capacity region that discharges
tProcess periodically measure, record the current value I in each cycle P
pWith battery temperature value T, T determines the battery temperature COEFFICIENT K according to the battery temperature value
T, according to current value I
pDetermine battery multiplying power COEFFICIENT K
C, utilize formula C
p=P * K
C* K
T* I
pCalculate the capability value C that absorbs or discharge in each cycle P
p, to SOC between capacity region
tThe capability value C in interior all cycles
pCarry out accumulation calculating and obtain SOC between capacity region
tThe interior capability value C that absorbs or discharge
n
As shown in Figure 3, in order to improve accuracy of detection, in one embodiment of the invention, described detection method also comprises step S31 after step S2: repeatedly monitor and calculate the current actual capacity value of several batteries C
r, to the current actual capacity value of described several batteries C
rThe value of averaging is calculated or is carried out effective value earlier and judge that again the value of averaging calculates the mean value C of the current actual capacity of battery
ReIn order to obtain the mean value SOH of cell health state SOH ratio
e, can also comprise step S41 after the step S31: the mean value C that utilizes the current actual capacity of battery
Re, and battery rated capacity value C
0, utilize formula S OH
e=C
Re÷ C
0Calculate the mean value SOH of cell health state SOH ratio
e
Natch, as shown in Figure 4, in one embodiment of the invention, described detection method also comprises step S32 after step S2: utilize the current actual capacity value of battery C
r, and battery rated capacity value C
0, utilize formula S OH=C
r÷ C
0Calculate cell health state SOH ratio.In order to improve accuracy of detection, described detection method also comprises step S42 at step S32: repeatedly monitor and calculate several cell health states SOH ratio, described several cell health states SOH ratio value of averaging is calculated or carried out effective value earlier and judge that again the value of averaging calculates the mean value SOH of cell health state SOH ratio
e
Above-mentioned detection method not only can be applied to lithium ion battery, can also be applied to the battery of types such as plumbic acid, ni-mh, NI-G, liquid stream, sodium salt, sodium sulphur.Be not only applicable to battery, also applicable to electric battery or electric core.
Based on above-mentioned detection method, as shown in Figure 5, the invention provides a kind of cell health state pick-up unit, this device comprises capacity monitoring modular and actual capacity value computing module; Described capacity monitoring modular is used for SOC between monitoring battery charge or the arbitrary capacity region of discharge process
tThe interior capability value C that absorbs or discharge
nDescribed actual capacity value computing module is used for utilizing described capability value C
n, SOC between described capacity region
t, calculate the current actual capacity value of battery C
r
Described actual capacity value computing module can pass through formula C
r=C
n÷ SOC
tCalculate the current actual capacity value of battery C
r
As shown in Figure 6, in one embodiment of the invention, described capacity monitoring modular comprises current value collecting unit and computing unit, and described current value collecting unit is used for measuring the current value I in each cycle P
p, described computing unit is used for utilizing formula C
p=P * I
pCalculate the capability value C that absorbs or discharge in each cycle P
p, to SOC between capacity region
tThe capability value C in interior all cycles
pCarry out accumulation calculating and obtain SOC between capacity region
tThe interior capability value C that absorbs or discharge
n
As shown in Figure 7, in one embodiment of the invention, described capacity monitoring modular also comprises current value collecting unit, temperature sensor, battery temperature coefficient determining unit and computing unit, and described current value collecting unit is used for measuring the current value I in each cycle P
p, described temperature sensor is used for measuring the battery temperature value T in each cycle P, and described battery temperature coefficient determining unit is used for determining the battery temperature COEFFICIENT K according to battery temperature value T
T, described computing unit is used for utilizing formula C
p=P * K
T* I
pCalculate the capability value C that absorbs or discharge in each cycle P
p, to SOC between capacity region
tThe capability value C in interior all cycles
pCarry out accumulation calculating and obtain SOC between capacity region
tThe interior capability value C that absorbs or discharge
n
In one embodiment of the invention, described battery temperature coefficient determining unit has been stored the battery temperature COEFFICIENT K of dissimilar batteries under different temperatures
TThe table of comparisons, during work according to determining the battery temperature COEFFICIENT K near temperature respective value in the table of comparisons of battery actual temperature
T
As shown in Figure 8, in one embodiment of the invention, described capacity monitoring modular also comprises current value collecting unit, battery times rate coefficient determining unit and computing unit, and described current value collecting unit is used for measuring the current value I in each cycle P
p, described battery times rate coefficient determining unit is used for according to current value I
pDetermine battery multiplying power COEFFICIENT K
C, described computing unit is used for utilizing formula C
p=P * K
C* I
pCalculate the capability value C that absorbs or discharge in each cycle P
p, to SOC between capacity region
tThe capability value C in interior all cycles
pCarry out accumulation calculating and obtain SOC between capacity region
tThe interior capability value C that absorbs or discharge
n
In one embodiment of the invention, described battery times rate coefficient determining unit has been stored dissimilar batteries in the battery multiplying power COEFFICIENT K under different charge-discharge magnifications
CThe table of comparisons, during work according to determining battery multiplying power COEFFICIENT K near the interior charge-discharge magnification respective value of the table of comparisons of the actual charge-discharge magnification of battery
C
As shown in Figure 9, in one embodiment of the invention, described capacity monitoring modular also comprises current value collecting unit, temperature sensor, battery temperature coefficient determining unit, battery times rate coefficient determining unit and computing unit, and described current value collecting unit is used for measuring the current value I in each cycle P
p, described temperature sensor is used for measuring the battery temperature value T in each cycle P, and described battery temperature coefficient determining unit is used for determining the battery temperature COEFFICIENT K according to battery temperature value T
T, described battery times rate coefficient determining unit is used for according to current value I
pDetermine battery multiplying power COEFFICIENT K
C, described computing unit is used for utilizing formula C
p=P * K
C* K
T* I
pCalculate the capability value C that absorbs or discharge in each cycle P
p, to SOC between capacity region
tThe capability value C in interior all cycles
pCarry out accumulation calculating and obtain SOC between capacity region
tThe interior capability value C that absorbs or discharge
n
As shown in figure 10, in one embodiment of the invention, described pick-up unit also comprises the mean value calculation module of a current actual capacity of battery, is used for repeatedly monitoring and calculating the current actual capacity value of several batteries C
r, to the current actual capacity value of described several batteries C
rThe value of averaging is calculated or is carried out effective value earlier and judge that again the value of averaging calculates the mean value C of the current actual capacity of battery
ReOn this basis, described pick-up unit can also comprise the mean value SOH of first a cell health state SOH ratio
eComputing module is for the mean value C that utilizes the current actual capacity of battery
Re, and battery rated capacity value C
0, utilize formula S OH
e=C
Re÷ C
0Calculate the mean value SOH of cell health state SOH ratio
e
As shown in figure 11, in one embodiment of the invention, described pick-up unit also comprises a cell health state SOH ratio calculation module, is used for utilizing the current actual capacity value of battery C
r, and battery rated capacity value C
0, utilize formula S OH=C
r÷ C
0Calculate cell health state SOH ratio.Described pick-up unit can also comprise the mean value SOH of second a cell health state SOH ratio on this basis
eComputing module, be used for repeatedly monitoring and calculating several cell health states SOH ratio, to described several cell health states SOH ratio value of averaging calculate or carry out earlier the effective value judgement again the value of averaging calculate the mean value SOH of cell health state SOH ratio
e
Described pick-up unit is applicable to multiple battery types such as lead-acid battery, lithium ion battery, Ni-MH battery, nickel-cadmium battery, flow battery, sodium salt battery, sodium-sulphur battery.Simultaneously, described pick-up unit is not only applicable to battery, and is applicable to electric battery or electric core.
The possible implementation that one of ordinary skill in the art will appreciate that various aspects of the present invention or various aspects can be embodied as system, method or computer program.Therefore, the possible implementation of each aspect of the present invention or various aspects can adopt complete hardware embodiment, complete software embodiment (comprising firmware, resident software etc.), perhaps the form of the embodiment of integration software and hardware aspect all is referred to as " circuit ", " module " or " system " here.In addition, the possible implementation of each aspect of the present invention or various aspects can adopt the form of computer program, and computer program refers to be stored in the computer readable program code in the computer-readable medium.
Computer-readable medium can be computer-readable signal media or computer-readable recording medium.Computer-readable recording medium is including but not limited to electronics, magnetic, optics, electromagnetism, infrared or semiconductor system, equipment or device, perhaps aforesaid any appropriate combination is as random-access memory (ram), ROM (read-only memory) (ROM), Erasable Programmable Read Only Memory EPROM (EPROM or flash memory), optical fiber, portable ROM (read-only memory) (CD-ROM).
Processor in the computing machine reads the computer readable program code that is stored in the computer-readable medium, makes processor can carry out the function action of stipulating in the combination of in process flow diagram each step or each step; Generation is implemented in the device of the function action of stipulating in the combination of each piece of block diagram or each piece.
Computer readable program code can be fully carried out in user's computer, part is carried out in user's computer, as independent software package, part on the user's computer and part on remote computer, perhaps carry out at remote computer or server fully.Should be noted that also that in some alternate embodiment the function that each piece indicated in each step or the block diagram in process flow diagram may be not according to occurring in sequence of indicating among the figure.For example, depend on related function, in fact two steps or two pieces of illustrating in succession may roughly be carried out simultaneously, and perhaps these pieces sometimes may be carried out with reverse order.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (20)
1. a cell health state detection method is characterized in that, may further comprise the steps:
SOC between arbitrary capacity region in monitoring battery charge or the discharge process
tThe interior capability value C that absorbs or discharge
n
Utilize described capability value C
n, SOC between described capacity region
t, calculate the current actual capacity value of battery C
r
2. cell health state detection method as claimed in claim 1 is characterized in that, calculates the current actual capacity value of battery C
rShi Liyong formula C
r=C
n÷ SOC
tCalculate.
3. cell health state detection method as claimed in claim 1 is characterized in that, SOC between arbitrary capacity region in the described monitoring battery charge and discharge process
tThe interior capability value C that absorbs or discharge
nStep further comprise:
To battery charge or the SOC between arbitrary capacity region that discharges
tProcess periodically measure, record the current value I in each cycle P
p, utilize formula C
p=P * I
pCalculate the capability value C that absorbs or discharge in each cycle P
p, to SOC between capacity region
tThe capability value C in interior all cycles
pCarry out accumulation calculating and obtain SOC between capacity region
tThe interior capability value C that absorbs or discharge
n
4. cell health state detection method as claimed in claim 1 is characterized in that, SOC between arbitrary capacity region in the described monitoring battery charge and discharge process
tThe interior capability value C that absorbs or discharge
nStep further comprise:
To battery charge or the SOC between arbitrary capacity region that discharges
tProcess periodically measure, record the current value I in each cycle P
pWith battery temperature value T, T determines the battery temperature COEFFICIENT K according to the battery temperature value
T, utilize formula C
p=P * K
T* I
pCalculate the capability value C that absorbs or discharge in each cycle P
p, to SOC between capacity region
tThe capability value C in interior all cycles
pCarry out accumulation calculating and obtain SOC between capacity region
tThe interior capability value C that absorbs or discharge
n
5. cell health state detection method as claimed in claim 1 is characterized in that, SOC between arbitrary capacity region in the described monitoring battery charge and discharge process
tThe interior capability value C that absorbs or discharge
nStep further comprise:
To battery charge or the SOC between arbitrary capacity region that discharges
tProcess periodically measure, record the current value I in each cycle P
p, according to current value I
pDetermine battery multiplying power COEFFICIENT K
C, utilize formula C
p=P * K
C* I
pCalculate the capability value C that absorbs or discharge in each cycle P
p, to SOC between capacity region
tThe capability value C in interior all cycles
pCarry out accumulation calculating and obtain SOC between capacity region
tThe interior capability value C that absorbs or discharge
n
6. cell health state detection method as claimed in claim 1 is characterized in that, SOC between arbitrary capacity region in the described monitoring battery charge and discharge process
tThe interior capability value C that absorbs or discharge
nStep further comprise:
To battery charge or the SOC between arbitrary capacity region that discharges
tProcess periodically measure, record the current value I in each cycle P
pWith battery temperature value T, T determines the battery temperature COEFFICIENT K according to the battery temperature value
T, according to current value I
pDetermine battery multiplying power COEFFICIENT K
C, utilize formula C
p=P * K
C* K
T* I
pCalculate the capability value C that absorbs or discharge in each cycle P
p, to SOC between capacity region
tThe capability value C in interior all cycles
pCarry out accumulation calculating and obtain SOC between capacity region
tThe interior capability value C that absorbs or discharge
n
7. as the arbitrary described cell health state detection method of claim 1-6, it is characterized in that described detection method is calculating the current actual capacity value of battery C
rFurther comprising the steps of afterwards: as repeatedly to monitor and calculate the current actual capacity value of several batteries C
r, to the current actual capacity value of described several batteries C
rThe value of averaging is calculated or is carried out effective value earlier and judge that again the value of averaging calculates the mean value C of the current actual capacity of battery
Re
8. cell health state detection method as claimed in claim 7 is characterized in that, described detection method is calculating the mean value C of the current actual capacity of battery
ReFurther comprising the steps of afterwards: the mean value C that utilizes the current actual capacity of battery
Re, and battery rated capacity value C
0, utilize formula S OH
e=C
Re÷ C
0Calculate the mean value SOH of cell health state SOH ratio
e
9. as the arbitrary described cell health state detection method of claim 1-6, it is characterized in that described detection method is calculating the current actual capacity value of battery C
rFurther comprising the steps of afterwards: as to utilize the current actual capacity value of battery C
r, and battery rated capacity value C
0, utilize formula S OH=C
r÷ C
0Calculate cell health state SOH ratio.
10. cell health state detection method as claimed in claim 9, it is characterized in that, described detection method is further comprising the steps of after calculating cell health state SOH ratio: repeatedly monitor and calculate several cell health states SOH ratio, described several cell health states SOH ratio value of averaging is calculated or carried out effective value earlier and judge that again the value of averaging calculates the mean value SOH of cell health state SOH ratio
e
11. a cell health state pick-up unit is characterized in that, comprises capacity monitoring modular and actual capacity value computing module; Described capacity monitoring modular is used for SOC between monitoring battery charge or the arbitrary capacity region of discharge process
tThe interior capability value C that absorbs or discharge
nDescribed actual capacity value computing module is used for utilizing described capability value C
n, SOC between described capacity region
t, calculate the current actual capacity value of battery C
r
12. cell health state pick-up unit as claimed in claim 11 is characterized in that, described actual capacity value computing module is by formula C
r=C
n÷ SOC
tCalculate the current actual capacity value of battery C
r
13. cell health state pick-up unit as claimed in claim 11 is characterized in that, described capacity monitoring modular comprises current value collecting unit and computing unit, and described current value collecting unit is used for measuring the current value I in each cycle P
p, described computing unit is used for utilizing formula C
p=P * I
pCalculate the capability value C that absorbs or discharge in each cycle P
p, to SOC between capacity region
tThe capability value C in interior all cycles
pCarry out accumulation calculating and obtain SOC between capacity region
tThe interior capability value C that absorbs or discharge
n
14. cell health state pick-up unit as claimed in claim 11, it is characterized in that, described capacity monitoring modular comprises current value collecting unit, temperature sensor, battery temperature coefficient determining unit and computing unit, and described current value collecting unit is used for measuring the current value I in each cycle P
p, described temperature sensor is used for measuring the battery temperature value T in each cycle P, and described battery temperature coefficient determining unit is used for determining the battery temperature COEFFICIENT K according to battery temperature value T
T, described computing unit is used for utilizing formula C
p=P * K
T* I
pCalculate the capability value C that absorbs or discharge in each cycle P
p, to SOC between capacity region
tThe capability value C in interior all cycles
pCarry out accumulation calculating and obtain SOC between capacity region
tThe interior capability value C that absorbs or discharge
n
15. cell health state pick-up unit as claimed in claim 11, it is characterized in that, described capacity monitoring modular comprises current value collecting unit, battery times rate coefficient determining unit and computing unit, and described current value collecting unit is used for measuring the current value I in each cycle P
p, described battery times rate coefficient determining unit is used for according to current value I
pDetermine battery multiplying power COEFFICIENT K
C, described computing unit is used for utilizing formula C
p=P * K
C* I
pCalculate the capability value C that absorbs or discharge in each cycle P
p, to SOC between capacity region
tThe capability value C in interior all cycles
pCarry out accumulation calculating and obtain SOC between capacity region
tThe interior capability value C that absorbs or discharge
n
16. cell health state pick-up unit as claimed in claim 11, it is characterized in that, described capacity monitoring modular comprises current value collecting unit, temperature sensor, battery temperature coefficient determining unit, battery times rate coefficient determining unit and computing unit, and described current value collecting unit is used for measuring the current value I in each cycle P
p, described temperature sensor is used for measuring the battery temperature value T in each cycle P, and described battery temperature coefficient determining unit is used for determining the battery temperature COEFFICIENT K according to battery temperature value T
T, described battery times rate coefficient determining unit is used for according to current value I
pDetermine battery multiplying power COEFFICIENT K
C, described computing unit is used for utilizing formula C
p=P * K
C* K
T* I
pCalculate the capability value C that absorbs or discharge in each cycle P
p, to SOC between capacity region
tThe capability value C in interior all cycles
pCarry out accumulation calculating and obtain SOC between capacity region
tThe interior capability value C that absorbs or discharge
n
17. as the arbitrary described cell health state pick-up unit of claim 11-16, it is characterized in that, described pick-up unit also comprises the mean value calculation module of a current actual capacity of battery, is used for repeatedly monitoring and calculating the current actual capacity value of several batteries C
r, to the current actual capacity value of described several batteries C
rThe value of averaging is calculated or is carried out effective value earlier and judge that again the value of averaging calculates the mean value C of the current actual capacity of battery
Re
18. cell health state pick-up unit as claimed in claim 17 is characterized in that, described pick-up unit also comprises the mean value SOH of first a cell health state SOH ratio
eComputing module is for the mean value C that utilizes the current actual capacity of battery
Re, and battery rated capacity value C
0, utilize formula S OH
e=C
Re÷ C
0Calculate the mean value SOH of cell health state SOH ratio
e
19., it is characterized in that described pick-up unit also comprises a cell health state SOH ratio calculation module as the arbitrary described cell health state pick-up unit of claim 11-16, be used for utilizing the current actual capacity value of battery C
r, and battery rated capacity value C
0, utilize formula S OH=C
r÷ C
0Calculate cell health state SOH ratio.
20., it is characterized in that described pick-up unit also comprises the mean value SOH of second a cell health state SOH ratio as the arbitrary described cell health state pick-up unit of claim 19
eComputing module, be used for repeatedly monitoring and calculating several cell health states SOH ratio, to described several cell health states SOH ratio value of averaging calculate or carry out earlier the effective value judgement again the value of averaging calculate the mean value SOH of cell health state SOH ratio
e
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| CN2013101158022A CN103197257A (en) | 2013-04-03 | 2013-04-03 | Method and device for detecting state of health (SOH) of battery |
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|---|---|---|---|
| CN2013101158022A CN103197257A (en) | 2013-04-03 | 2013-04-03 | Method and device for detecting state of health (SOH) of battery |
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