CN105911471A - Device for calculating state-of-health parameters of electric automobile battery and method thereof - Google Patents
Device for calculating state-of-health parameters of electric automobile battery and method thereof Download PDFInfo
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Abstract
The embodiment of the invention discloses a device for calculating state-of-health parameters of an electric automobile battery and a method thereof. The device comprises a reduced discharge number calculation module which is used for calculating the reduced discharge number of the battery based on the total number of discharge of the battery within a preset period of time and the discharge type of each time of discharge; a reduced charge number calculation module which is used for calculating the reduced charge number of the battery based on the total number of charge of the battery within the preset period of time and the charge type of each time of charge; and an SOH parameter calculation module which is used for calculating the SOH parameters of the battery based on the reduced discharge number and the reduced charge number.
Description
Technical field
The present invention relates to automobile technical field, more particularly, to a kind of health status calculating batteries of electric automobile
The apparatus and method of (State-of-Health, SOH) parameter.
Background technology
Energy shortage, oil crisis and environmental pollution grow in intensity, and bring tremendous influence to the life of people, are directly connected to
National economy and the sustainable development of society.Countries in the world are all at active development new energy technology.Electric automobile drops as one
Low consumption of petroleum, low stain, low noise new-energy automobile it is considered to be solve energy crisis and the important way of ecological deterioration
Footpath.Hybrid vehicle takes into account pure electric automobile and the advantage of traditional combustion engine automobile simultaneously, is meeting vehicle dynamic quality requirement
With continual mileage require on the premise of, be effectively improved fuel economy, reduce discharge it is considered to be the most energy-conservation and
One of active path reduced discharging.
In the cost structure of electric automobile, batteries of electric automobile account for greatly.If the life-span of batteries of electric automobile
Too short, electric automobile cost will be dramatically increased.The health status (State-of-Health, SOH) of batteries of electric automobile is retouched
State be one slowly, irreversible change procedure.Along with recycling being continuously increased of number of times, batteries of electric automobile group
Health status can have a declining tendency, the most this downward trend is mainly declined the most serious monomer electricity by health status
The impact of electrical automobile battery, is therefore accurately entered the health status of batteries of electric automobile group by cell management system of electric automobile
Row is estimated, the monomer batteries of electric automobile that health status decline reaches marginal value is changed, and can effectively extend electronic vapour
The service life of car set of cells, cost-effective, there is the highest economic worth, also it is the charged of power electric automobile battery simultaneously
The aspects such as state (State of Charge, SOC) estimation, battery equalization system of electric automobile provide reference frame, for promoting electricity
The development of electrical automobile cause is significant.
In the prior art, can based on discharge and recharge total degree estimate SOH parameter, wherein and do not differentiate between charge type (as
Quick charge and at a slow speed charging) and the difference of electric discharge type (such as repid discharge and electric discharge at a slow speed).But, charging behavior and
Electric discharge behavior has bigger individual difference, if do not distinguished charge type and electric discharge type, causes calculating
SOH parameter accuracy is the highest.
And, use battery capacity to reduce for a long time along with battery, dump energy (SOC) value calculated in prior art
Can not truly reflect the real dump energy of battery.
Summary of the invention
The purpose of the present invention is to propose to the device of a kind of SOH parameter calculating batteries of electric automobile, thus improve SOH parameter
Accuracy.
Another object of the present invention is a kind of method proposing SOH parameter calculating batteries of electric automobile, thus improves SOH
Accuracy.
According to the one side of embodiment of the present invention, the device of a kind of SOH parameter calculating batteries of electric automobile is proposed, should
Device includes:
Convert discharge time computing module, for electric discharge total degree based on battery described in the scheduled time and putting of discharging every time
Electricity type, calculates the conversion discharge time of described battery；
Conversion charging times computing module, for charging total degree based on battery described in the described scheduled time and charging every time
Charge type, calculate the conversion charging times of described battery；
SOH parameter calculating module, for calculating described battery based on described conversion discharge time and described conversion charging times
SOH parameter.
Preferably, described electric discharge type includes repid discharge type and electric discharge type at a slow speed；
Conversion discharge time computing module, determines the electric discharge type of described each electric discharge for electric discharge attribute based on electric discharge every time,
Described electric discharge attribute include following at least one: discharge current, depth of discharge and the velocity of discharge；For described repid discharge
Type arranges the first weight, arranges the second weight for described electric discharge type at a slow speed, and wherein the second weight is less than the first weight；Will
The discharge time and described second of the product of the discharge time of repid discharge type and described first weight and electric discharge type at a slow speed
The product summation of weight, obtains the conversion discharge time of described battery.
Preferably, described charge type includes quick charge type and charge type at a slow speed；
Conversion charging times computing module, determines the charge type of described each charging for charging attribute based on charging every time,
Described charging attribute include following at least one: charging current, depth of charge and charging rate；For described quick charge
Type arranges the 3rd weight, arranges the 4th weight for described charge type at a slow speed, and wherein the 4th weight is less than the 3rd weight；Will
The charging times and the described 4th of the product of the charging times of quick charge type and described 3rd weight and charge type at a slow speed
The product summation of weight, obtains the conversion charging times of described battery.
Preferably, SOH parameter calculating module, for described conversion discharge time and described conversion charging times are sued for peace, with
Obtain converting discharge and recharge total degree；Based on the corresponding relation between conversion discharge and recharge total degree and the SOH parameter pre-saved,
Calculate the SOH parameter corresponding to described conversion discharge and recharge total degree.
Preferably, also include:
Dump energy computing module, for calculating the dump energy soc of described battery based on described SOH parameter；
Wherein A is the current capacities of described battery；B is the initial capacity of described battery；Soh is described SOH parameter.
Another aspect according to embodiment of the present invention, it is also proposed that the side of a kind of SOH parameter calculating batteries of electric automobile
Method, the method includes:
Electric discharge total degree based on battery described in the scheduled time and the electric discharge type of electric discharge every time, calculate the conversion of described battery
Discharge time；
Charging total degree based on battery described in the described scheduled time and the charge type of charging every time, calculate described battery
Conversion charging times；
The SOH parameter of described battery is calculated based on described conversion discharge time and described conversion charging times.
Preferably, described electric discharge type includes repid discharge type and electric discharge type at a slow speed；
Before calculating the conversion discharge time of described battery, the method includes: electric discharge attribute based on electric discharge every time determines institute
State the electric discharge type of every time electric discharge, wherein said electric discharge attribute include following at least one: discharge current, depth of discharge
And the velocity of discharge；
The conversion discharge time of described calculating battery includes: arrange the first weight for described repid discharge type, for described at a slow speed
Electric discharge type arranges the second weight, and wherein the second weight is less than the first weight；By the discharge time of repid discharge type with described
The product of the first weight discharge time with electric discharge type at a slow speed and the product summation of described second weight, obtain described battery
Conversion discharge time.
Preferably, described charge type includes quick charge type and charge type at a slow speed；
Before calculating the conversion charging times of described battery, the method also includes: charging attribute based on charging every time determines
The charge type of described each charging, described charging attribute include following at least one: charging current, depth of charge and
Charging rate；
The conversion charging times of described calculating battery includes: arrange the 3rd weight for described quick charge type, for described at a slow speed
Charge type arranges the 4th weight, and wherein the 4th weight is less than the 3rd weight；By the charging times of quick charge type with described
The product of the 3rd weight charging times with charge type at a slow speed and the product summation of described 4th weight, obtain described battery
Conversion charging times.
Preferably, the described health status ginseng calculating described battery based on described conversion discharge time and described conversion charging times
Number includes:
Described conversion discharge time and described conversion charging times are sued for peace, to obtain converting discharge and recharge total degree；Based in advance
Corresponding relation between the conversion discharge and recharge total degree and the health parameter that preserve, calculates total corresponding to described conversion discharge and recharge
The health parameter of number of times.
Preferably, also include:
The dump energy soc of described battery is calculated based on described health parameter；
Wherein A is the current capacities of described battery；B is the initial capacity of described battery；Soh is described health parameter.
From technique scheme it can be seen that in embodiments of the present invention, conversion discharge time computing module is based on pre-timing
The electric discharge total degree of interior battery and the electric discharge type of electric discharge every time, the conversion discharge time of calculating battery；Conversion charging times
Computing module charge type based on the charging total degree of battery in the scheduled time with charging every time, calculates the conversion charging of battery
Number of times；Health parameter computing module calculates the SOH parameter of battery based on conversion discharge time and conversion charging times.
As can be seen here, charge type (or electric discharge type of electric discharge behavior) the not difference to charging behavior it is different from prior art
The unified counting in ground, the present invention based on charging attribute (include charging current, depth of charge and charging rate, etc.) to charging
Behavior carries out careful differentiation to determine quick charge type and charge type at a slow speed, based on charging attribute (include discharge current,
Depth of discharge and the velocity of discharge, etc.) electric discharge behavior is carried out careful differentiation to determine repid discharge type and to discharge at a slow speed
Type, the most different charge type and electric discharge type are respectively provided with corresponding weight, and add up conversion discharge time
With conversion charging times, then based on conversion discharge time and conversion charging times calculate battery SOH parameter, such that it is able to
Improve the accuracy of SOH parameter.
And, the SOH parameter calculated based on mode of the present invention can accurately calculate SOC, and user is given SOC's
Correct information.
Accompanying drawing explanation
The present invention is only schematically illustrated and explains by the following drawings, not delimit the scope of the invention.
Fig. 1 is the structure drawing of device of the battery SOH parameter calculating electric automobile according to the present invention.
Fig. 2 is the method flow diagram of the battery SOH parameter calculating electric automobile according to the present invention.
Fig. 3 is according to first embodiment of the invention, calculates the method flow diagram of battery SOH parameter.
Fig. 4 is according to second embodiment of the invention, calculates the method flow diagram of battery SOH parameter.
Fig. 5 is according to third embodiment of the invention, calculates the method flow diagram of battery SOH parameter.
Detailed description of the invention
In order to technical characteristic, purpose and the effect of invention are more clearly understood from, the now tool of the comparison accompanying drawing explanation present invention
Body embodiment, the most identical label represents identical part.
Succinct and directly perceived in order on describing, enters the solution of the present invention hereafter by describing some representational embodiments
Row illustrates.In embodiment, substantial amounts of details is only used for help and understands the solution of the present invention.However, it will be apparent that the skill of the present invention
These details can be not limited to when art scheme realizes.In order to avoid unnecessarily having obscured the solution of the present invention, some are implemented
Mode describes the most meticulously, but only gives framework.Hereinafter, " including " refers to " including but not limited to ",
" according to ... " refer to " according at least to ..., but be not limited to according only to ... ".Due to the language convention of Chinese, hereafter
In when being not specifically stated the quantity of a composition, it is meant that it can also be multiple that this composition can be one, or can be regarded as
At least one.
In embodiments of the present invention, be different from prior art to charging behavior charge type (or electric discharge behavior electric discharge
Type) not the most unified counting, but based on charging attribute (include charging current, depth of charge and charging rate,
Etc.) charging behavior carried out careful differentiation to determine quick charge type and charge type at a slow speed, based on charging attribute (bag
Include discharge current, depth of discharge and the velocity of discharge, etc.) electric discharge behavior is carried out careful differentiation to determine repid discharge class
Type and at a slow speed electric discharge type, the most different charge type and electric discharge type are respectively provided with corresponding weight, and add up conversion
Discharge time and conversion charging times, then the SOH parameter of battery is calculated based on conversion discharge time and conversion charging times.
Fig. 1 is the structure drawing of device calculating batteries of electric automobile SOH parameter according to the present invention.
The battery of electric automobile specifically may be embodied as: nickel-hydrogen accumulator group；Lead-acid batteries；Li-ion batteries piles；Nickel
Zinc battery group；Sodium sulfur storage battery group；Zinc-air battery；Flying wheel battery；Ultracapacitor；Fuel cell, etc..
As it is shown in figure 1, storage has discharge and recharge information log file 104 in this device 100.Discharge and recharge information log file 104
Middle record has battery charging total degree, electric discharge total degree, the charging attribute of every time charging in the given time and puts every time
The electric discharge attribute of electricity.
Specifically, electric discharge attribute include following at least one: discharge current, depth of discharge and the velocity of discharge；Charging belongs to
Property include following at least one: charging current, depth of charge and charging rate.
Discharge current is that battery is to the electric current of formation during load releasing stored electric energy；Depth of discharge is that the capacity that battery is released accounts for
The percentage ratio of its rated capacity；The velocity of discharge is the capacity that battery is released in the given time.In general, discharge current is more
Greatly, the life-span of battery is the shortest；Depth of discharge is the deepest, and the life-span of battery is the shortest；The velocity of discharge is the fastest, and the life-span of battery is more
Short.
Charging current is input current during battery storage electric energy.Depth of charge is that the capacity of battery storage accounts for its rated capacity
Percentage ratio.Charging rate is the capacity that battery is filled with in the given time.In general, charging current is the biggest, the longevity of battery
Order the shortest；Depth of charge is the deepest, and the life-span of battery is the shortest；Charging rate is the fastest, and the life-span of battery is the shortest.
This device 100 includes:
Conversion discharge time computing module 101, for based on the electric discharge total degree of battery in the scheduled time and putting of each electric discharge
Electricity type, calculates the conversion discharge time of battery；
Conversion charging times computing module 102, for based on the charging total degree of battery in this scheduled time and charging every time
Charge type, calculates the conversion charging times of battery；
SOH parameter calculating module 103, for calculating the SOH ginseng of battery based on conversion discharge time and conversion charging times
Number.
Preferably, this device 100 can be applied in battery management system (BMS).
In one embodiment: electric discharge type includes repid discharge type and electric discharge type at a slow speed；Conversion discharge time calculates
Module 101, determines the electric discharge type of electric discharge every time for electric discharge attribute based on electric discharge every time.
Conversion discharge time computing module 101 can determine the electric discharge type of electric discharge every time based on one or more electric discharge attribute.
Such as, when certain discharge current discharged is more than discharge current threshold value set in advance, then conversion discharge time meter
Calculate module 101 and determine that this electric discharge is repid discharge, when certain discharge current discharged is not more than discharge current set in advance
During threshold value, then conversion discharge time computing module 101 determines that this electric discharge is for discharge at a slow speed.
Such as, when certain depth of discharge discharged is more than depth of discharge threshold value set in advance, then conversion discharge time meter
Calculate module 101 and determine that this electric discharge is repid discharge, when certain depth of discharge discharged is not more than depth of discharge set in advance
During threshold value, then conversion discharge time computing module 101 determines that this electric discharge is for discharge at a slow speed.
Such as, when certain velocity of discharge discharged is more than velocity of discharge threshold value set in advance, then conversion discharge time meter
Calculate module 101 and determine that this electric discharge is repid discharge, when certain velocity of discharge discharged is not more than the velocity of discharge set in advance
During threshold value, then conversion discharge time computing module 101 determines that this speed is for discharge at a slow speed.
It practice, be also based on multiple electric discharge attribute to determine the electric discharge type of electric discharge every time.
Such as, when certain discharge current discharged is more than discharge current threshold value set in advance and the depth of discharge of this electric discharge
During more than depth of discharge threshold value set in advance, conversion discharge time computing module 101 determines that this electric discharge is repid discharge,
When certain depth of discharge discharged is not more than pre-more than the depth of discharge of discharge current threshold value set in advance and this electric discharge
During the depth of discharge threshold value first set, conversion discharge time computing module 101 determines that this electric discharge is for discharge at a slow speed；When certain
The depth of discharge of secondary electric discharge is less than the depth of discharge of discharge current threshold value set in advance and this electric discharge more than presetting
Depth of discharge threshold value time, conversion discharge time computing module 101 determine this time electric discharge for discharge at a slow speed；When certain discharges
Depth of discharge less than the depth of discharge of discharge current threshold value set in advance and this electric discharge less than electric discharge set in advance
During degree of depth threshold value, conversion discharge time computing module 101 determines that this electric discharge is for discharge at a slow speed.The rest may be inferred, can be with base
The charge type of charging every time is determined in multiple charging attributes.
Conversion discharge time computing module 101 arranges the first weight for repid discharge type, arranges second for electric discharge type at a slow speed
Weight, wherein the second weight is less than the first weight.Conversion discharge time computing module 101 is again by the electric discharge of repid discharge type
The product of number of times and the first weight is sued for peace with the discharge time of electric discharge type at a slow speed and the product of the second weight, obtains the folding of battery
Calculate discharge time.
Such as, if battery one has 100 electric discharges, it is for 50 times wherein repid discharge type, is for 50 times class of discharging at a slow speed
Type, and the weight of repid discharge type is 1, and the weight of electric discharge type is 0.5 at a slow speed；
So, conversion discharge time=50 × 1+50*0.5=75 (secondary).
For another example, battery one has 200 electric discharges, and wherein 150 times is repid discharge type, is for 50 times electric discharge type at a slow speed,
And the weight of repid discharge type is 1, the weight of electric discharge type is 0.6 at a slow speed；
So, conversion discharge time=150 × 1+50*0.6=180 (secondary).
Describe conversion discharge time computing module 101 in detail with example above and calculate the process of conversion discharge time, this area
Technical staff is it is to be appreciated that this description is only protection domain that is exemplary, that be not intended to limit the present invention.
Electric discharge type by repid discharge type and is made a distinction, it practice, also may be used as a example by electric discharge type at a slow speed by above description
Electric discharge type to be carried out further multi-level refinement, be such as divided into: extremely fast electric discharge type, repid discharge type, in
Speed electric discharge type, at a slow speed electric discharge type, pole electric discharge type at a slow speed, etc., and respectively every kind electric discharge type is arranged accordingly
Weight.
Similarly, charge type can include quick charge type and charge type at a slow speed；
Conversion charging times computing module 102, determines the charge type of charging every time for charging attribute based on charging every time,
Charging attribute include following at least one: charging current, depth of charge and charging rate.
Conversion charging times computing module 102 can determine the charge type of charging every time based on one or more charging attribute.
Such as, when certain charging current charged is more than charging current threshold value set in advance, then conversion charging times meter
Calculate module 102 and determine that this time is charged as quick charge, when certain charging current charged is not more than charging current set in advance
During threshold value, then conversion charging times computing module 102 determines this time to be charged as at a slow speed to charge.
Such as, when certain depth of charge charged is more than depth of charge threshold value set in advance, then conversion charging times meter
Calculate module 102 and determine that this time is charged as quick charge, when certain depth of charge charged is not more than depth of charge set in advance
During threshold value, then conversion charging times computing module 102 determines this time to be charged as at a slow speed to charge.
Such as, when certain charging rate charged is more than charging rate threshold value set in advance, then conversion charging times meter
Calculate module 102 and determine that this time is charged as quick charge, when certain charging rate charged is not more than depth of charge set in advance
During threshold value, then conversion discharge time computing module 102 determines that this speed is for charge at a slow speed.
Conversion charging times computing module 102, arranges the 3rd weight for quick charge type, arranges for charge type at a slow speed
Four weights, wherein the 4th weight is less than the 3rd weight；By the product of the charging times of quick charge type and the 3rd weight with slow
The charging times of speed charge type and the product summation of the 4th weight, obtain the conversion charging times of battery.
Such as, battery one has 100 chargings, and wherein 50 times is quick charge type, is for 50 times charge type at a slow speed,
And the weight of repid discharge type is 1, the weight of electric discharge type is 0.5 at a slow speed；
So, conversion charging times=50 × 1+50*0.5=75 (secondary).
For another example, battery one has 200 chargings, and wherein 150 times is quick charge type, is for 50 times charge type at a slow speed,
And the weight of quick charge type is 1, the weight of charge type is 0.6 at a slow speed；
So, conversion charging times=150 × 1+50*0.6=180 (secondary).
Describe conversion charging times computing module 102 in detail with example above and calculate the process of conversion charging times, this area
Technical staff is it is to be appreciated that this description is only protection domain that is exemplary, that be not intended to limit the present invention.
Charge type by quick charge type and is made a distinction, it practice, also may be used as a example by charge type at a slow speed by above description
Charge type to be carried out further multi-level refinement, be such as divided into: extremely fast charge type, quick charge type, in
Speed charge type, at a slow speed charge type, pole charge type at a slow speed, etc., and respectively every kind charge type is arranged accordingly
Weight.
When conversion discharge time computing module 101 and conversion charging times computing module 102 calculate conversion discharge time respectively
After conversion charging times, health parameter computing module 103 will convert discharge time and conversion charging times summation,
To obtain converting discharge and recharge total degree；Again based on pre-save conversion discharge and recharge total degree and SOH parameter between corresponding
Relation, calculates the SOH parameter corresponding to converting discharge and recharge total degree.
Such as, following corresponding relation can have been pre-saved in health parameter computing module 103 based on empirical data:
When converting discharge and recharge total degree and being 0, corresponding SOH is 100%；When converting discharge and recharge total degree and being 1000, right
The SOH answered is 50%；When converting discharge and recharge total degree and being 1500, corresponding SOH is 30%；... when conversion charge and discharge
When electricity total degree is 2000, corresponding SOH is 0%.
Assuming that health parameter computing module 103 calculated conversion discharge and recharge total degree is 1000, then based on this correspondence
It is 50% that relation can obtain SOH；When health parameter computing module 103 calculated conversion discharge and recharge total degree
Be 1500, then can calculate SOH is 30%.
Describe health parameter computing module 103 in detail with example above and calculate the process of SOH, people in the art
Member is it is to be appreciated that this description is only protection domain that is exemplary, that be not intended to limit the present invention.
In one embodiment, this device 100 also includes:
Dump energy computing module 105, for calculating the dump energy soc of battery based on SOH parameter；
Wherein A is the current capacities of battery；B is the initial capacity of battery；Soh is SOH parameter.
Such as, it is assumed that certain battery is in charging, and the soh of this battery is 50%；Initial capacity is 50 ampere-hours, and current capacities is
25 ampere-hours, soc calculation based on prior art,Such that make charging reach
The current heap(ed) capacity of battery (25 ampere-hour), suggested soc remains as 50%, thus brings misleading to user.Should
After the present invention, calculateUser's battery can be correctly pointed out to fill with, thus
User can stop charging.
Based on above-mentioned analysis, the invention allows for a kind of method calculating batteries of electric automobile SOH parameter.
Fig. 2 is the method flow diagram of the battery SOH parameter calculating electric automobile according to the present invention.
As in figure 2 it is shown, the method includes:
Step 201: based on the electric discharge total degree of battery in the scheduled time and the electric discharge type of electric discharge every time, calculate the folding of battery
Calculate discharge time；
Step 202: based on the charging total degree of battery in this scheduled time and the charge type of charging every time, calculate battery
Conversion charging times；
Step 203: calculate the SOH parameter of battery based on conversion discharge time and conversion charging times.
In one embodiment, electric discharge type includes repid discharge type and electric discharge type at a slow speed；
Before step 201 calculates the conversion discharge time of battery, the method includes: electric discharge attribute based on electric discharge every time is true
The electric discharge type of fixed electric discharge every time, wherein electric discharge attribute include following at least one: discharge current, depth of discharge and put
Electricity speed；
The conversion discharge time calculating battery in step 201 includes: arrange the first weight for repid discharge type, for putting at a slow speed
Electricity type arranges the second weight, and wherein the second weight is less than the first weight；By discharge time and first power of repid discharge type
The product of weight is sued for peace with the discharge time of electric discharge type at a slow speed and the product of the second weight, obtains the conversion discharge time of battery.
In one embodiment, charge type includes quick charge type and charge type at a slow speed；
Before step 202 calculates the conversion charging times of battery, the method also includes: charging attribute based on charging every time
Determine the charge type of described each charging, described charging attribute include following at least one: charging current, charging are deep
Degree and charging rate；
The conversion charging times calculating battery in step 202 includes: arrange the 3rd weight for quick charge type, for filling at a slow speed
Electricity type arranges the 4th weight, and wherein the 4th weight is less than the 3rd weight；By charging times and the 3rd power of quick charge type
The product of weight is sued for peace with the charging times of charge type at a slow speed and the product of the 4th weight, obtains the conversion charging times of battery.
In one embodiment, step 203 calculates the SOH of battery based on conversion discharge time and conversion charging times
Parameter includes:
Conversion discharge time is sued for peace with conversion charging times, to obtain converting discharge and recharge total degree；Based on the folding pre-saved
Calculate the corresponding relation between discharge and recharge total degree and SOH parameter, calculate the SOH parameter corresponding to converting discharge and recharge total degree.
In one embodiment, the method also includes:
The dump energy soc of battery is calculated based on SOH parameter；
Wherein
A is the current capacities of battery；B is the initial capacity of battery；Soh is SOH parameter.
Fig. 3 is according to first embodiment of the invention, calculates the method flow diagram of battery SOH parameter.
As it is shown on figure 3, charge for battery the most every time, the analysis process of behavior, sees step 301～304,
Specifically include:
Step 301: judge whether the charging current of this charging behavior is more than threshold value set in advance (50A), if it is,
Perform step 302 and subsequent step thereof, if it is not, perform step 303 and subsequent step thereof.
Step 302: determine that this charging behavior is quick charge, and arrange this time charging behavior weight be 1, perform step
304。
Step 303: determine that this charging behavior is to charge at a slow speed, and arrange this time charging behavior weight be 0.3, perform step
304。
Step 304: calculate the weighted sum value of all charging times, is the conversion charging times of battery.
For battery analysis process of electric discharge behavior every time within this scheduled time, see step 305～308, specifically include:
Step 305: judge whether the discharge current of electric discharge behavior is more than threshold value set in advance (80A), if it is, hold
Row step 306 and subsequent step thereof, if it is not, perform step 307 and subsequent step thereof.
Step 306: determine that this electric discharge behavior is repid discharge, and arrange this time electric discharge behavior weight be 1, perform step
308。
Step 307: determine that this electric discharge behavior is to discharge at a slow speed, and arrange this time electric discharge behavior weight be 0.3, perform step
308。
Step 308: calculate the weighted sum value of all discharge times, is the conversion discharge time of battery.
Then, the SOH parameter of battery of electric vehicle is calculated in a step 309 based on conversion discharge time and conversion charging times.
Fig. 4 is according to second embodiment of the invention, calculates the method flow diagram of battery SOH parameter.
As shown in Figure 4, the analysis process of behavior that battery is charged the most every time, see step 401～404,
Specifically include:
Step 401: judge whether the charging current of this charging behavior is more than threshold value set in advance (50A), if it is,
Perform step 402 and subsequent step thereof, if it is not, perform step 403 and subsequent step thereof.
Step 402: determine that this charging behavior is quick charge, and arrange this time charging behavior weight be 1, perform step
404。
Step 403: determine that this charging behavior is to charge at a slow speed, and arrange this time charging behavior weight be 0.3, perform step
404。
Step 404: calculate the weighted sum value of all charging times, is the conversion charging times of battery.
For battery analysis process of electric discharge behavior every time within this scheduled time, see step 405～408, specifically include:
Step 405: judge whether the depth of discharge of electric discharge behavior is more than threshold value set in advance (90%), if it is, hold
Row step 406 and subsequent step thereof, if it is not, perform step 407 and subsequent step thereof.
Step 406: determine that this electric discharge behavior is repid discharge, and arrange this time electric discharge behavior weight be 1, perform step
408。
Step 407: determine that this electric discharge behavior is to discharge at a slow speed, and arrange this time electric discharge behavior weight be 0.3, perform step
408。
Step 408: calculate the weighted sum value of all discharge times, is the conversion discharge time of battery.
Then, the SOH parameter of battery of electric vehicle is calculated in step 409 based on conversion discharge time and conversion charging times.
Fig. 5 is according to third embodiment of the invention, calculates the method flow diagram of battery SOH parameter.
The analysis process of behavior as it is shown in figure 5, charge for battery the most every time, residual volume step 501～504,
Specifically include:
Step 501: judge whether the charging current of this charging behavior is more than threshold value set in advance (50A), if it is,
Perform step 502 and subsequent step thereof, if it is not, perform step 503 and subsequent step thereof.
Step 502: determine that this charging behavior is quick charge, and arrange this time charging behavior weight be 1, perform step
504。
Step 503: determine that this charging behavior is to charge at a slow speed, and arrange this time charging behavior weight be 0.3, perform step
504。
Step 504: calculate the weighted sum value of all charging times, is the conversion charging times of battery.
For battery analysis process of electric discharge behavior every time within this scheduled time, see step 505～508, specifically include:
Step 505: judge the velocity of discharge of electric discharge behavior whether more than threshold value set in advance (such as, 10 kilowatts/hour,
Or it is discharged beyond the 30% of whole SOC in one presets the time), if it is, perform step 506 and follow-up step thereof
Suddenly, if it is not, perform step 507 and subsequent step thereof.
Step 506: determine that this electric discharge behavior is repid discharge, and arrange this time electric discharge behavior weight be 1, perform step
508。
Step 507: determine that this electric discharge behavior is to discharge at a slow speed, and arrange this time electric discharge behavior weight be 0.3, perform step
508。
Step 508: calculate the weighted sum value of all discharge times, is the conversion discharge time of battery.
Then, the SOH parameter of battery of electric vehicle is calculated in step 509 based on conversion discharge time and conversion charging times.
In sum, in embodiments of the present invention, conversion discharge time computing module is based on the electric discharge of battery in the scheduled time
Total degree and the electric discharge type of electric discharge every time, calculate the conversion discharge time of battery；Conversion charging times computing module is based in advance
Fix time the charging total degree of interior battery and the charge type of every time charging, calculate the conversion charging times of battery；Health status
Parameter calculating module calculates the SOH parameter of battery based on conversion discharge time and conversion charging times.As can be seen here, different
In prior art, charge type (or electric discharge type of the electric discharge behavior) unification the most distinctively to charging behavior counts, this
Invent, based on charging attribute (include charging current, depth of charge and charging rate, etc.), charging behavior is carried out careful district
Point to determine quick charge type and charge type at a slow speed, based on charging, attribute (includes discharge current, depth of discharge and puts
Electricity speed, etc.) electric discharge behavior carried out careful differentiation to determine repid discharge type and electric discharge type at a slow speed, then divide
It is not respectively provided with corresponding weight for different charge type and electric discharge type, and adds up conversion discharge time and conversion charging time
Number, then calculate the SOH parameter of battery based on conversion discharge time and conversion charging times, such that it is able to improve SOH parameter
Accuracy.
And, the SOH parameter calculated based on mode of the present invention can accurately calculate SOC, and user is given SOC's
Correct information.
The a series of detailed description of those listed above is only for illustrating of the feasibility embodiment of the present invention, and
And be not used to limit the scope of the invention, all equivalent embodiments made without departing from skill of the present invention spirit or change,
As feature combination, split or repeat, should be included within the scope of the present invention.
Claims (10)
1. the device of the health parameter calculating batteries of electric automobile, it is characterised in that this device includes:
Conversion discharge time computing module, for electric discharge total degree based on battery described in the scheduled time and the electric discharge of electric discharge every time
Type, calculates the conversion discharge time of described battery；
Conversion charging times computing module, for charging total degree based on battery described in the described scheduled time and charging every time
Charge type, calculates the conversion charging times of described battery；
Health parameter computing module, for calculating described battery based on described conversion discharge time and described conversion charging times
Health parameter.
Device the most according to claim 1, it is characterised in that described electric discharge type includes repid discharge type and puts at a slow speed
Electricity type；
Conversion discharge time computing module, is used for:
Electric discharge attribute based on every time electric discharge determines the electric discharge type of described each electric discharge, wherein said electric discharge attribute include following in
At least one: discharge current, depth of discharge and the velocity of discharge；
First weight is set for described repid discharge type, the second weight, wherein the second weight are set for described electric discharge type at a slow speed
Less than the first weight；Electric discharge time by the discharge time of the repid discharge type product with described first weight with electric discharge type at a slow speed
Number and the product summation of described second weight, obtain the conversion discharge time of described battery.
Device the most according to claim 1, it is characterised in that described charge type includes quick charge type and fills at a slow speed
Electricity type；
Conversion charging times computing module, is used for:
Charging attribute based on every time charging determines the charge type of described each charging, described charging attribute include following in extremely
Few one: charging current, depth of charge and charging rate；
3rd weight is set for described quick charge type, the 4th weight, wherein the 4th weight are set for described charge type at a slow speed
Less than the 3rd weight；Charging time by the charging times of the quick charge type product with described 3rd weight with charge type at a slow speed
Number and the product summation of described 4th weight, obtain the conversion charging times of described battery.
Device the most according to claim 1, it is characterised in that
Health parameter computing module, for suing for peace described conversion discharge time and described conversion charging times, to be rolled over
Calculate discharge and recharge total degree；Based on the corresponding relation between conversion discharge and recharge total degree and the health parameter pre-saved, calculate
Health parameter corresponding to described conversion discharge and recharge total degree.
Device the most according to claim 1, it is characterised in that also include:
Dump energy computing module, for calculating the dump energy soc of described battery based on described health parameter；
Wherein A is the current capacities of described battery；B is the initial capacity of described battery；Soh is described health parameter.
6. the method for the health parameter calculating batteries of electric automobile, it is characterised in that the method includes:
Electric discharge total degree based on battery described in the scheduled time and the electric discharge type of electric discharge every time, the conversion calculating described battery is put
Electricity number of times；
Charging total degree based on battery described in the described scheduled time and the charge type of charging every time, calculate the folding of described battery
Calculate charging times；
The health parameter of described battery is calculated based on described conversion discharge time and described conversion charging times.
Method the most according to claim 6, it is characterised in that described electric discharge type includes repid discharge type and puts at a slow speed
Electricity type；
Before calculating the conversion discharge time of described battery, the method includes: electric discharge attribute based on electric discharge every time determines described
The every time electric discharge type of electric discharge, wherein said electric discharge attribute include following at least one: discharge current, depth of discharge and put
Electricity speed；
The conversion discharge time of described calculating battery includes: arranges the first weight for described repid discharge type, puts at a slow speed for described
Electricity type arranges the second weight, and wherein the second weight is less than the first weight；By the discharge time of repid discharge type and described first
The product of weight is sued for peace with the product of described second weight with the discharge time of electric discharge type at a slow speed, and the conversion obtaining described battery is put
Electricity number of times.
Method the most according to claim 6, it is characterised in that described charge type includes quick charge type and fills at a slow speed
Electricity type；
Before calculating the conversion charging times of described battery, the method also includes: charging attribute based on charging every time determines institute
State the charge type of every time charging, described charging attribute include following at least one: charging current, depth of charge and charging
Speed；
The conversion charging times of described calculating battery includes: arranges the 3rd weight for described quick charge type, fills at a slow speed for described
Electricity type arranges the 4th weight, and wherein the 4th weight is less than the 3rd weight；By the charging times of quick charge type and the described 3rd
The product of weight is sued for peace with the product of described 4th weight with the charging times of charge type at a slow speed, and the conversion obtaining described battery is filled
Electricity number of times.
Method the most according to claim 6, it is characterised in that
Described health parameter based on described conversion discharge time and the described conversion charging times described battery of calculating includes:
Described conversion discharge time and described conversion charging times are sued for peace, to obtain converting discharge and recharge total degree；Based on protecting in advance
Corresponding relation between conversion discharge and recharge total degree and the health parameter deposited, calculates corresponding to described conversion discharge and recharge total degree
Health parameter.
Method the most according to claim 6, it is characterised in that also include:
The dump energy soc of described battery is calculated based on described health parameter；
Wherein A is the current capacities of described battery；B is the initial capacity of described battery；Soh is described health parameter.
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