CN106553551B - A kind of battery remaining power acquisition methods, battery management system and electric car - Google Patents

A kind of battery remaining power acquisition methods, battery management system and electric car Download PDF

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Publication number
CN106553551B
CN106553551B CN201611027304.2A CN201611027304A CN106553551B CN 106553551 B CN106553551 B CN 106553551B CN 201611027304 A CN201611027304 A CN 201611027304A CN 106553551 B CN106553551 B CN 106553551B
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voltage
battery
current
mapping relations
stable state
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CN106553551A (en
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马东辉
周瑾
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Beijing CHJ Automotive Information Technology Co Ltd
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Beijing CHJ Automotive Information Technology Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/12Recording operating variables ; Monitoring of operating variables
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/3644Constructional arrangements
    • G01R31/3648Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3835Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00Control parameters of input or output; Target parameters
    • B60L2240/40Drive Train control parameters
    • B60L2240/54Drive Train control parameters related to batteries
    • B60L2240/547Voltage
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage systems for electromobility, e.g. batteries

Abstract

The present invention provides a kind of battery remaining power acquisition methods, battery management system and electric car, wherein method include: detect battery work as front voltage;It searches the end voltage of the battery obtained in advance and whether has recorded the current end voltage in the first mapping relations of stable state open-circuit voltage;If record has the current end voltage in first mapping relations, according to described when the corresponding stable state open-circuit voltage of front voltage obtains the current dump energy of the battery.In this way, the embodiment of the present invention passes through the mapping relations for obtaining the end voltage and stable state open-circuit voltage of battery in advance, the purpose for working as accurate dump energy under front voltage is obtained to realize.

Description

A kind of battery remaining power acquisition methods, battery management system and electric car
Technical field
The present invention relates to technical field of battery management more particularly to a kind of battery remaining power acquisition methods, battery control System and electric car.
Background technique
Battery is one of many electrical equipments, such as the main stored energy power source of electric car, in order to ensure entire battery The stable operation of system needs the parameters to battery, especially battery remaining power to carry out real-time monitoring.Traditional battery The main having time Current Voltage integration method of dump energy acquisition methods, this method have the disadvantage in that depositing due to hysteresis voltage It is being had a certain difference between actually measured voltage value and true value;Current sensor for detecting electric current, which exists, to be missed Difference has a certain difference between actually measured current value and true value.Therefore, it is obtained using time current integration method surplus Complementary energy is accumulated at any time certainly exists accumulated error, causes final result inaccurate.As it can be seen that existing battery remaining power obtains Method is taken to there is a problem of not accurate enough.
Summary of the invention
The embodiment of the present invention provides a kind of battery remaining power acquisition methods, battery management system and electric car, with solution Certainly existing battery remaining power acquisition methods there is a problem of not accurate enough.
In a first aspect, the embodiment of the invention provides a kind of battery remaining power acquisition methods, comprising:
Detection battery works as front voltage;
It searches and whether is recorded in the end voltage and the first mapping relations of stable state open-circuit voltage of the battery obtained in advance There is the current end voltage;
If record has the current end voltage in first mapping relations, basis is with described when front voltage is corresponding Stable state open-circuit voltage obtains the current dump energy of the battery.
Second aspect, the embodiment of the present invention also provide a kind of battery management system, comprising:
First detection module works as front voltage for detect battery;
First searching module, the end voltage for searching the battery obtained in advance are reflected with the first of stable state open-circuit voltage It penetrates in relationship and whether has recorded the current end voltage;
First obtains module, if having the current end voltage, basis and institute for record in first mapping relations It states when the corresponding stable state open-circuit voltage of front voltage obtains the current dump energy of the battery.
The third aspect, the embodiment of the present invention also provide a kind of electric car, including above-mentioned battery management system.
In this way, that detects battery works as front voltage in the embodiment of the present invention;Search the end electricity of the battery obtained in advance The current end voltage whether has been recorded in pressure and the first mapping relations of stable state open-circuit voltage;If in first mapping relations Record has the current end voltage, then basis is with described when the front voltage corresponding stable state open-circuit voltage acquisition battery is current Dump energy.In this way, mapping relations of the embodiment of the present invention by the end voltage and stable state open-circuit voltage of acquisition battery in advance, To realize the purpose obtained when dump energy accurate under front voltage.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, needed in being described below to the embodiment of the present invention Attached drawing to be used is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, For those of ordinary skill in the art, without any creative labor, it can also obtain according to these attached drawings Take other attached drawings.
Fig. 1 is the flow chart for the battery remaining power acquisition methods that first embodiment of the invention provides;
Fig. 2 is the flow chart for the battery remaining power acquisition methods that second embodiment of the invention provides;
Fig. 2-1 is the voltage change figure that the battery output circuit that second embodiment of the invention provides disconnects front and back;
Fig. 3 is the flow chart for the battery remaining power acquisition methods that third embodiment of the invention provides;
Fig. 4 is the flow chart for the battery remaining power acquisition methods that fourth embodiment of the invention provides;
Fig. 5 is the flow chart for the battery remaining power acquisition methods that fifth embodiment of the invention provides;
Fig. 6 is the flow chart for the battery remaining power acquisition methods that sixth embodiment of the invention provides;
Fig. 7 is the flow chart for the battery remaining power acquisition methods that seventh embodiment of the invention provides;
Fig. 8 is one of the structure chart of battery management system that eighth embodiment of the invention provides;
Fig. 9 is the two of the structure chart for the battery management system that eighth embodiment of the invention provides;
Figure 10 is the three of the structure chart for the battery management system that eighth embodiment of the invention provides;
Figure 11 is the four of the structure chart for the battery management system that eighth embodiment of the invention provides;
Figure 12 is the five of the structure chart for the battery management system that eighth embodiment of the invention provides;
Figure 13 is the six of the structure chart for the battery management system that eighth embodiment of the invention provides.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair Embodiment in bright, those of ordinary skill in the art's acquired every other implementation without creative efforts Example, shall fall within the protection scope of the present invention.
First embodiment
It is the flow chart of battery remaining power acquisition methods provided in an embodiment of the present invention referring to Fig. 1, Fig. 1, such as Fig. 1 institute Show, the battery remaining power acquisition methods of the embodiment of the present invention, comprising the following steps:
Step 101, detection battery work as front voltage.
The battery remaining power acquisition methods of the embodiment of the present invention and subsequent all embodiments are made suitable for all with battery For the electrical equipment, such as electric bicycle, electric car etc. in main stored energy power source, in order to make it easy to understand, the present invention is implemented Example and subsequent all embodiments are illustrated by taking electric car as an example.
In the step, above-mentioned detection battery when front voltage is the electricity of electric car in electric car normally travel The end voltage at the battery current time that pond management system detects.Above-mentioned normally travel may include but be not limited to steady row Sail, give it the gun, descent run or climbing traveling situations such as.Wherein, the end voltage in the embodiment of the present invention each means battery Output circuit when being not turned off (when battery is connected with load in other words), load the voltage drop value at both ends.
In the end voltage for the battery that step 102, lookup obtain in advance and the first mapping relations of stable state open-circuit voltage Whether record has the current end voltage.
First mapping relations of above-mentioned end voltage and stable state open-circuit voltage are preparatory by the battery management system of electric car It obtains.Above-mentioned first mapping relations can be battery management system to cells under certain operating condition, such as battery Output circuit disconnects front and back, test side voltage data and stable state open-circuit voltage data and obtains.Above-mentioned first mapping relations can In the form of being presented as curve graph, it can also be presented as the form of table, may be embodied in the form of function, in this regard, this hair Bright embodiment is simultaneously not construed as limiting.
Wherein, the stable state open-circuit voltage of the embodiment of the present invention refer to battery in the case where disconnecting loading condition, by it is certain when Between after, such as 20 minutes, 30 minutes, 40 minutes or 60 minutes etc., the voltage value at measured battery both ends.Time gets over Long, the stable state open-circuit voltage measured more tends to balance potential.
In the step, the current voltage value for whether recording in the first mapping relations and detecting in step 101 is required to look up.
If record has the current end voltage in step 103, first mapping relations, work as front end electricity according to described Corresponding stable state open-circuit voltage is pressed to obtain the current dump energy of the battery.
In the step, if record has what step 101 detected to work as front voltage in above-mentioned first mapping relations, it can manage Xie Wei, battery management system have got stable state open-circuit voltage values corresponding with the current voltage value in advance.In addition, many institutes It is known, in electrochemical theory, for same type of battery, the fitting of stable state open-circuit voltage values and battery remaining power Function curve is known, that is to say, that by inquire the fitting function curve can be obtained it is corresponding with stable state open-circuit voltage values Accurate residual energy magnitude.Accordingly, it is possible to be obtained according to stable state open-circuit voltage values and the functional relation of battery remaining power The current dump energy of battery under current electricity side pressure.
If do not record that step 101 detects in the first mapping relations works as front voltage, can be according to time current Voltage integration obtains the current dump energy of battery.Since time current voltage integration is for obtaining battery remaining power The prior art, this is not repeated.
In addition, when failing to get the first mapping relations of end voltage and stable state open-circuit voltage in advance, in addition to can root It is obtained except the current dump energy of battery according to time current voltage integration, it can also be to end voltage and stable state open-circuit voltage Correspondence setting initial value, initial value can be other batteries from specification same as cells and getting end voltage After the first mapping relations of stable state open-circuit voltage, the corresponding relationship of end voltage Yu stable state open-circuit voltage is stored and shared. After it can get in advance the first mapping relations, battery management system can be updated above-mentioned initial value.
In the embodiment of the present invention, although having corresponding fitting letter between the stable state open-circuit voltage of battery and its dump energy Number curve, however, stable state open-circuit voltage in electric car actual travel can not real-time measurement obtain, the practical row of electric car Sail middle energy real-time measurement is end voltage.In consideration of it, the embodiment of the present invention is opened by obtaining the end voltage of battery in advance with stable state The purpose by holding the accurate dump energy of voltage indirect gain can be realized in the mapping relations of road voltage.
The battery remaining power acquisition methods of the embodiment of the present invention, that detects battery works as front voltage;It searches and obtains in advance The end voltage of the battery and the first mapping relations of stable state open-circuit voltage in whether recorded the current end voltage;If institute Stating in the first mapping relations record has the current end voltage, then according to described when the corresponding stable state open-circuit voltage of front voltage Obtain the current dump energy of the battery.In this way, the embodiment of the present invention is opened by obtaining the end voltage of battery in advance with stable state The mapping relations of road voltage, to realize the purpose obtained when dump energy accurate under front voltage.
Second embodiment
Referring to fig. 2, Fig. 2 is the flow chart of battery remaining power acquisition methods provided in an embodiment of the present invention, such as Fig. 2 institute Show, the battery remaining power acquisition methods of the embodiment of the present invention, comprising the following steps:
If the voltage wave of step 201, the battery after stopping output energy and before the output circuit disconnection of the battery Dynamic amplitude is less than or equal to the first preset value, then detects the first end voltage of the battery.
In the embodiment of the present invention, step 201 to step 203 can be understood as the end voltage and stable state open-circuit voltage of battery The specific acquisition methods of first mapping relations.
In the embodiment of the present invention, setting obtains the operating condition of end voltage and stable state open-circuit voltage, in simple terms, can be divided into point Not Huo Qu end voltage and stable state open-circuit voltage two small operating conditions.First operating condition is for obtaining end voltage, and the second operating condition is for obtaining Take stable state open-circuit voltage.
In the step, battery stop export energy after (such as electric car by inertia gently travel until parking Process or electric car descending neutral gear slide), and before the output circuit disconnection of the battery (such as pull key flame-out Before), and the fluctuating range of voltage is less than or equal to the first preset value, such as voltage fluctuation range (is also possible to current fluctuation Amplitude, voltage fluctuation range are more accurate than current fluctuation amplitude) it is less than or equal to ± 0.2mv or voltage fluctuation range Less than or equal to ± 0.1mv, it is believed that reached the requirement of the first operating condition, battery management system is the voltage detected at this time As first end voltage.Wherein, the first operating condition can be operating condition locating for the section T2 as shown in Fig. 2-1.
If the time that the output circuit of step 202, the battery disconnects be more than or equal to preset time, detection described in First stable state open-circuit voltage of battery.
In the step, battery after output circuit disconnection (such as pulling key flame-out rear) waits certain time, including polarization Hysteresis voltage including voltage is constantly decreased to negligible degree, and open-circuit voltage at this moment constantly converges on stable state open circuit electricity Pressure or equilibrium potential, the difference between open-circuit voltage and equilibrium potential reach negligible degree, i.e., it is believed that reaching The requirement of second operating condition, battery management system are the first stable state open-circuit voltage detected at this time.Wherein, the second operating condition can be as Operating condition locating for the section T3 shown in Fig. 2-1.
The corresponding relationship of the first end voltage and the first stable state open-circuit voltage is stored in described by step 203 In one mapping relations.
It, will the first end voltage that detected in step 201 and the first stable state open-circuit voltage detected in step 202 in the step Relationship correspond, and be stored in the first mapping relations.
Step 204, detection battery work as front voltage.
In the step, above-mentioned detection battery when front voltage is the electricity of electric car in electric car normally travel The end voltage at the battery current time that pond management system detects.Above-mentioned normally travel may include but be not limited to steady row Sail, give it the gun, descent run or climbing traveling situations such as.Wherein, the end voltage in the embodiment of the present invention each means battery Output circuit when being not turned off (when battery is connected with load in other words), load the voltage drop value at both ends.
Step 205 searches in first mapping relations whether recorded the current end voltage.
Above-mentioned first mapping relations can be obtained by step 203, be the battery management system by electric car Under certain operating condition, such as the output circuit of battery disconnects front and back, test side voltage data and stable state open-circuit voltage data and obtain ?.
Wherein, the stable state open-circuit voltage of the embodiment of the present invention refer to battery in the case where disconnecting loading condition, by it is certain when Between after, such as 20 minutes, 30 minutes, 40 minutes or 60 minutes etc., the voltage value at measured battery both ends.Time gets over Long, the stable state open-circuit voltage measured more tends to balance potential.
In the step, the current voltage value for whether recording in the first mapping relations and detecting in step 204 is required to look up.
If record has the current end voltage in step 206, first mapping relations, work as front end electricity according to described Corresponding stable state open-circuit voltage is pressed to obtain the current dump energy of the battery.
In the step, if record has what step 204 detected to work as front voltage in above-mentioned first mapping relations, it can manage Xie Wei, battery management system have got stable state open-circuit voltage values corresponding with the current voltage value in advance.Therefore, so that it may To obtain the residual energy that battery is current under current electric side pressure according to the functional relation of stable state open-circuit voltage values and battery remaining power Amount.
If do not record that step 204 detects in the first mapping relations works as front voltage, can be according to time current Voltage integration obtains the current dump energy of battery.Since time current voltage integration is for obtaining battery remaining power The prior art, this is not repeated.
In addition, before failing to undergo step 201 to step 203, in addition to that can be obtained according to time current voltage integration It, can also be to the correspondence setting initial value of end voltage and stable state open-circuit voltage, just except the dump energy for taking battery current Initial value can be other batteries from specification same as cells stored after undergoing step 201 to step 203 and Share the corresponding relationship of end voltage and stable state open-circuit voltage, after undergoing step 201 to step 203, battery management system can To be updated to above-mentioned initial value.
It should be noted that step 201 can both execute before the step 204 to step 203, it can also be in step 206 It executes later, step 201 to step 203 can be repeated with step 204 to step 206, and above step is a dynamic Process.
The battery remaining power acquisition methods of the embodiment of the present invention, if the battery stop export energy after and the electricity Voltage fluctuation range before the output circuit in pond disconnects is less than or equal to the first preset value, then detects the first end of the battery Voltage;If the time that the output circuit of the battery disconnects is more than or equal to preset time, the first of the battery is detected Stable state open-circuit voltage;The corresponding relationship of the first end voltage and the first stable state open-circuit voltage is stored in described first to reflect It penetrates in relationship;Detection battery works as front voltage;Search the end voltage and stable state open-circuit voltage of the battery obtained in advance Whether the current end voltage has been recorded in first mapping relations;If record has the current end electricity in first mapping relations Pressure, then according to described when the corresponding stable state open-circuit voltage of front voltage obtains the current dump energy of the battery.In this way, this Inventive embodiments are by presetting certain battery status, when battery management system judges that battery is in the battery status, The end voltage and stable state open-circuit voltage of battery are obtained, to form corresponding mapping relations.Whole process can be considered as cell tube The purpose obtained when dump energy accurate under front voltage has been better achieved in the process that reason system learns cells.
3rd embodiment
It is the flow chart of battery remaining power acquisition methods provided in an embodiment of the present invention referring to Fig. 3, Fig. 3, such as Fig. 3 institute Show, the battery remaining power acquisition methods of the embodiment of the present invention, comprising the following steps:
If the voltage wave of step 301, the battery after stopping output energy and before the output circuit disconnection of the battery Dynamic amplitude is less than or equal to the first preset value, then detects the first end voltage of the battery.
In the embodiment of the present invention, step 301 to step 303 can be understood as the end voltage and stable state open-circuit voltage of battery The specific acquisition methods of first mapping relations.
In the embodiment of the present invention, setting obtains the operating condition of end voltage and stable state open-circuit voltage, in simple terms, can be divided into point Not Huo Qu end voltage and stable state open-circuit voltage two small operating conditions.First operating condition is for obtaining end voltage, and the second operating condition is for obtaining Take stable state open-circuit voltage.
In the step, battery stop export energy after (such as electric car by inertia gently travel until parking Process or electric car descending neutral gear slide), and before the output circuit disconnection of the battery (such as pull key flame-out Before), and the fluctuating range of voltage is less than or equal to the first preset value, such as voltage fluctuation range (is also possible to current fluctuation Amplitude, voltage fluctuation range are more accurate than current fluctuation amplitude) it is less than or equal to ± 0.2mv or voltage fluctuation range Less than or equal to ± 0.1mv, it is believed that reached the requirement of the first operating condition, battery management system is the voltage detected at this time As first end voltage.
If the time that the output circuit of step 302, the battery disconnects be more than or equal to preset time, detection described in First stable state open-circuit voltage of battery.
In the step, battery after output circuit disconnection (such as pulling key flame-out rear) waits certain time, including polarization Hysteresis voltage including voltage is constantly decreased to negligible degree, and open-circuit voltage at this moment constantly converges on stable state open circuit electricity Pressure or equilibrium potential, the difference between open-circuit voltage and equilibrium potential reach negligible degree, i.e., it is believed that reaching The requirement of second operating condition, battery management system are the first stable state open-circuit voltage detected at this time.
The corresponding relationship of the first end voltage and the first stable state open-circuit voltage is stored in described by step 303 In one mapping relations.
It, will the first end voltage that detected in step 201 and the first stable state open-circuit voltage detected in step 202 in the step Relationship correspond, and be stored in the first mapping relations.
Step 304, by the first end voltage and the first stable state open-circuit voltage in first mapping relations Corresponding relationship is uploaded in first server, and the first server is for storing battery identical with the battery specifications Hold the server of the mapping relations of voltage and stable state open-circuit voltage.
Before failing to undergo step 301 to step 303, it can be set to the corresponding relationship of end voltage and stable state open-circuit voltage Set initial value, initial value can be other batteries from specification same as cells experience step 301 to step 303 it The corresponding relationship for storing and sharing end voltage Yu stable state open-circuit voltage afterwards, after undergoing step 301 to step 303, battery Management system can be updated above-mentioned initial value.
Likewise, in the step, the end voltage in the first mapping relations that battery management system can obtain step 303 And the corresponding relationship of stable state open-circuit voltage is uploaded in server, can be shared with the battery system of other same specification.Share Mode for example can be also possible to be downloaded in the server by other battery systems with upload server.
Wherein, the end voltage that above-mentioned server can be for storing battery identical with cells specification is opened with stable state The server of the mapping relations of road voltage can also be that the end voltage of the battery for storing various battery specifications and stable state are opened a way The server of the mapping relations of voltage.
Step 305, detection battery work as front voltage.
In the step, above-mentioned detection battery when front voltage is the electricity of electric car in electric car normally travel The end voltage at the battery current time that pond management system detects.Above-mentioned normally travel may include but be not limited to steady row Sail, give it the gun, descent run or climbing traveling situations such as.Wherein, the end voltage in the embodiment of the present invention each means battery Output circuit when being not turned off (when battery is connected with load in other words), load the voltage drop value at both ends.
Step 306 searches in first mapping relations whether recorded the current end voltage.
Above-mentioned first mapping relations can be obtained by step 303, be the battery management system by electric car Under certain operating condition, such as the output circuit of battery disconnects front and back, test side voltage data and stable state open-circuit voltage data and obtain ?.
In the step, the current voltage value for whether recording in the first mapping relations and detecting in step 204 is required to look up.
If record has the current end voltage in step 307, first mapping relations, work as front end electricity according to described Corresponding stable state open-circuit voltage is pressed to obtain the current dump energy of the battery.
In the step, if record has what step 305 detected to work as front voltage in above-mentioned first mapping relations, it can manage Xie Wei, battery management system have got stable state open-circuit voltage values corresponding with the current voltage value in advance.Therefore, so that it may To obtain the residual energy that battery is current under current electric side pressure according to the functional relation of stable state open-circuit voltage values and battery remaining power Amount.
If do not record that step 305 detects in the first mapping relations works as front voltage, can be according to time current Voltage integration obtains the current dump energy of battery.Since time current voltage integration is for obtaining battery remaining power The prior art, this is not repeated.
Wherein, the stable state open-circuit voltage of the embodiment of the present invention refer to battery in the case where disconnecting loading condition, by it is certain when Between after, such as 20 minutes, 30 minutes, 40 minutes or 60 minutes etc., the voltage value at measured battery both ends.Time gets over Long, the stable state open-circuit voltage measured more tends to balance potential.
It should be noted that being not carried out the restriction of sequence, i.e. step between step 304 and step 305 to step 307 304 can execute before step 305, can also execute after the either step of step 305 to step 307, can also be with The either step of step 305 to step 307 is performed simultaneously.
The battery remaining power acquisition methods of the embodiment of the present invention, if the battery stop export energy after and the electricity Voltage fluctuation range before the output circuit in pond disconnects is less than or equal to the first preset value, then detects the first end of the battery Voltage;If the time that the output circuit of the battery disconnects is more than or equal to preset time, the first of the battery is detected Stable state open-circuit voltage;The corresponding relationship of the first end voltage and the first stable state open-circuit voltage is stored in described first to reflect It penetrates in relationship;By the corresponding relationship of the first end voltage and the first stable state open-circuit voltage in first mapping relations Be uploaded in first server, the first server be for store battery identical with the battery specifications end voltage and The server of the mapping relations of stable state open-circuit voltage;Detection battery works as front voltage;Search the battery obtained in advance The current end voltage whether has been recorded in first mapping relations of end voltage and stable state open-circuit voltage;If first mapping is closed Record has the current end voltage in system, then works as the front voltage corresponding stable state open-circuit voltage acquisition battery according to described Current dump energy.In this way, the embodiment of the present invention is obtained in addition to can be realized when accurate dump energy under front voltage Purpose except, by the way that the corresponding relationship between voltage and stable state open-circuit voltage will be held to be uploaded to server, can also realize electricity The sharing of pond mapping relations.
Fourth embodiment
Referring to fig. 4, Fig. 4 is the flow chart of battery remaining power acquisition methods provided in an embodiment of the present invention, such as Fig. 4 institute Show, the battery remaining power acquisition methods of the embodiment of the present invention, comprising the following steps:
Step 401, detection battery work as front voltage.
In the step, above-mentioned detection battery when front voltage is the electricity of electric car in electric car normally travel The end voltage at the battery current time that pond management system detects.Above-mentioned normally travel may include but be not limited to steady row Sail, give it the gun, descent run or climbing traveling situations such as.Wherein, the end voltage in the embodiment of the present invention each means battery Output circuit when being not turned off (when battery is connected with load in other words), load the voltage drop value at both ends.
In the end voltage for the battery that step 402, lookup obtain in advance and the first mapping relations of stable state open-circuit voltage Whether record has the current end voltage.
First mapping relations of above-mentioned end voltage and stable state open-circuit voltage are preparatory by the battery management system of electric car It obtains.Above-mentioned first mapping relations can be battery management system to cells under certain operating condition, such as battery Output circuit disconnects front and back, test side voltage data and stable state open-circuit voltage data and obtains.Above-mentioned first mapping relations can In the form of being presented as curve graph, it can also be presented as the form of table, may be embodied in the form of function, in this regard, this hair Bright embodiment is simultaneously not construed as limiting.
Wherein, the stable state open-circuit voltage of the embodiment of the present invention refer to battery in the case where disconnecting loading condition, by it is certain when Between after, such as 20 minutes, 30 minutes, 40 minutes or 60 minutes etc., the voltage value at measured battery both ends.Time gets over Long, the stable state open-circuit voltage measured more tends to balance potential.
In the step, the current voltage value for whether recording in the first mapping relations and detecting in step 101 is required to look up.
If record has the current end voltage in step 403, first mapping relations, work as front end electricity according to described Corresponding stable state open-circuit voltage is pressed to obtain the current dump energy of the battery.
In the step, if record has what step 401 detected to work as front voltage in above-mentioned first mapping relations, it can manage Xie Wei, battery management system have got stable state open-circuit voltage values corresponding with the current voltage value in advance.Therefore, so that it may To obtain the residual energy that battery is current under current electric side pressure according to the functional relation of stable state open-circuit voltage values and battery remaining power Amount.
If not recorded the current end voltage in step 404, first mapping relations, first mapping is searched Work as the smallest second end voltage of front end voltage phase difference amplitude with described in relationship.
In the embodiment of the present invention, due to the end voltage stored in the first mapping relations for obtaining in advance early period data volume also It is insufficient, complete corresponding terminal voltage value cannot be found, for example, when front voltage is 3.2V, but in the first mapping relations simultaneously Corresponding stable state open-circuit voltage values when being 3.2V are not stored with end voltage.
It at this point, in the step, can look for immediate with above-mentioned end voltage, i.e. the smallest record of difference amplitude is to determine Corresponding stable state open-circuit voltage.For example, there is with the immediate end voltage of 3.2V record in the first mapping relations is 3.15V, and hold Corresponding stable state open-circuit voltage is 3.19V when voltage is 3.15V, it is determined that stable state open-circuit voltage at this time is 3.19V.
If step 405, the second end voltage are preset with described when voltage phase difference amplitude in front end is less than or equal to second Value then obtains the current dump energy of the battery according to stable state open-circuit voltage corresponding with the second end voltage.
In the step, the amplitude of difference can be less than or equal to the terminal voltage value of the second preset value as working as front voltage Reasonable term of reference, for example, the second preset value can be 0.05V or 0.03V or 0.02V etc., in this way, battery management System can obtain corresponding dump energy according to the stable state open-circuit voltage of 3.19V.
If above-mentioned second end voltage is greater than above-mentioned second preset value with front end voltage phase difference amplitude is worked as, can be according to the time Current Voltage integration method obtains the current dump energy of the battery.Since time current voltage integration is for obtaining battery The prior art of dump energy does not repeat this.
The embodiment of the present invention can be equally carried out in conjunction with Fig. 2 and embodiment shown in Fig. 3, to avoid repeating, to this It does not repeat.
The battery remaining power acquisition methods of the embodiment of the present invention, that detects battery works as front voltage;It searches and obtains in advance The end voltage of the battery and the first mapping relations of stable state open-circuit voltage in whether recorded the current end voltage;If institute Stating in the first mapping relations record has the current end voltage, then according to described when the corresponding stable state open-circuit voltage of front voltage Obtain the current dump energy of the battery;If not recorded the current end voltage in first mapping relations, search Work as the smallest second end voltage of front end voltage phase difference amplitude with described in first mapping relations;According to electric with the second end Corresponding stable state open-circuit voltage is pressed to obtain the current dump energy of the battery.In this way, the embodiment of the present invention is in mapping relations In the case where there is no corresponding end voltage data, by find in mapping relations it is existing with when front voltage immediate end electricity Pressure, effectively compensates for the limited defect of storing data in mapping relations.
5th embodiment
It is the flow chart of battery remaining power acquisition methods provided in an embodiment of the present invention referring to Fig. 5, Fig. 5, such as Fig. 5 institute Show, the battery remaining power acquisition methods of the embodiment of the present invention, comprising the following steps:
Step 501, detection battery work as front voltage.
In the step, above-mentioned detection battery when front voltage is the electricity of electric car in electric car normally travel The end voltage at the battery current time that pond management system detects.Above-mentioned normally travel may include but be not limited to steady row Sail, give it the gun, descent run or climbing traveling situations such as.Wherein, the end voltage in the embodiment of the present invention each means battery Output circuit when being not turned off (when battery is connected with load in other words), load the voltage drop value at both ends.
In the end voltage for the battery that step 502, lookup obtain in advance and the first mapping relations of stable state open-circuit voltage Whether record has the current end voltage.
First mapping relations of above-mentioned end voltage and stable state open-circuit voltage are preparatory by the battery management system of electric car It obtains.Above-mentioned first mapping relations can be battery management system to cells under certain operating condition, such as battery Output circuit disconnects front and back, test side voltage data and stable state open-circuit voltage data and obtains.Above-mentioned first mapping relations can In the form of being presented as curve graph, it can also be presented as the form of table, may be embodied in the form of function, in this regard, this hair Bright embodiment is simultaneously not construed as limiting.
Wherein, the stable state open-circuit voltage of the embodiment of the present invention refer to battery in the case where disconnecting loading condition, by it is certain when Between after, such as 20 minutes, 30 minutes, 40 minutes or 60 minutes etc., the voltage value at measured battery both ends.Time gets over Long, the stable state open-circuit voltage measured more tends to balance potential.
In the step, the current voltage value for whether recording in the first mapping relations and detecting in step 101 is required to look up.
If record has the current end voltage in step 503, first mapping relations, work as front end electricity according to described Corresponding stable state open-circuit voltage is pressed to obtain the current dump energy of the battery.
In the step, if record has what step 501 detected to work as front voltage in above-mentioned first mapping relations, it can manage Xie Wei, battery management system have got stable state open-circuit voltage values corresponding with the current voltage value in advance.Therefore, so that it may To obtain the residual energy that battery is current under current electric side pressure according to the functional relation of stable state open-circuit voltage values and battery remaining power Amount.
If not recorded the current end voltage in step 504, first mapping relations, search in second server Storage with whether recorded in the mapping relations of other batteries of the battery same size with it is described when front voltage it is corresponding Third end voltage.
In the step, if do not record that step 501 detects in above-mentioned first mapping relations works as front voltage, cell tube Reason system can search in the mapping relations with cells same size other batteries that are being stored in second server whether Record has third end voltage corresponding with front voltage is worked as.
If storing in step 505, the second server close with other batteries of battery same size mappings Record has third end voltage in system, then obtains the battery according to stable state open-circuit voltage corresponding with third end voltage Current dump energy.
In the step, if in the mapping relations with cells same size other batteries that are being stored in second server Record has third end voltage corresponding with front voltage is worked as, then can be obtained according to stable state open-circuit voltage corresponding with third end voltage Take the dump energy that battery is current.
When later period battery management system has got the mapping of new third terminal voltage value Yu the stable state open-circuit voltage of itself Relationship can then be replaced the mapping relations obtained from second server with new mapping relations, update.
If not recorded in the mapping relations with the battery same size other batteries that are being stored in above-mentioned second server There is above-mentioned third end voltage, then can obtain the current dump energy of the battery according to time current voltage integration.Due to Time current voltage integration is the prior art for obtaining battery remaining power, is not repeated this.
It should be noted that can only store the mapping with other batteries of the battery same size in second server In relationship, it also can store the mapping relations of the battery of various rules.
The first server in second server and 3rd embodiment in the embodiment of the present invention, can be identical service Device is also possible to different servers.
The battery remaining power acquisition methods of the embodiment of the present invention, that detects battery works as front voltage;It searches and obtains in advance The end voltage of the battery and the first mapping relations of stable state open-circuit voltage in whether recorded the current end voltage;If institute Stating in the first mapping relations record has the current end voltage, then according to described when the corresponding stable state open-circuit voltage of front voltage Obtain the current dump energy of the battery;If not recorded the current end voltage in first mapping relations, search Whether record in the mapping relations with other batteries of the battery same size stored in second server and has worked as with described The corresponding third end voltage of front voltage;If the other batteries with the battery same size stored in the second server Mapping relations in record have third end voltage, then according to stable state open-circuit voltage corresponding with third end voltage obtain The current dump energy of the battery.In the case that the embodiment of the present invention does not have corresponding end voltage data in mapping relations, By find store in the server with when the immediate end voltage of front voltage, effectively compensate in mapping relations and store The limited defect of data.
Sixth embodiment
It is the flow chart of battery remaining power acquisition methods provided in an embodiment of the present invention referring to Fig. 6, Fig. 6, such as Fig. 6 institute Show, the battery remaining power acquisition methods of the embodiment of the present invention, comprising the following steps:
Step 601, detection battery work as front voltage and Current Temperatures.
In view of under the conditions of different temperature, the corresponding dump energy of identical stable state open-circuit voltage is not identical, That is the dump energy of battery is also related to temperature.Therefore, the variable of temperature is increased in the embodiment of the present invention, to realize The purpose of the dump energy of more accurate acquisition battery.
In the step, battery management system detection battery works as front voltage and Current Temperatures.
Temperature, end voltage and the second mapping of stable state open-circuit voltage for the battery that step 602, lookup obtain in advance are closed Work as front voltage described in whether being recorded under the Current Temperatures in system.
In the step, the second mapping relations obtained in advance are for the temperature of storage battery, end voltage and stable state open circuit electricity The corresponding relationship of pressure.
In general, different temperature ranges can be set, with the son mapping that each temperature range is the second mapping relations Relationship searches whether that record has in the corresponding sub- mapping relations of corresponding temperature range and works as front end electricity under Current Temperatures Pressure.Temperature range can be with 10 degrees Celsius as a section, can be with 5 degrees Celsius as a section, can be Celsius with 8 Degree is a section, and interval division is smaller, and the dump energy of acquisition is more accurate.
If being recorded in step 603, second mapping relations and working as front voltage described in having under the Current Temperatures, The current dump energy of the battery is obtained according to the corresponding stable state open-circuit voltage of front voltage of working as under the Current Temperatures.
In the step, if record has and works as front voltage under Current Temperatures in the second mapping relations, can according to The dump energy current when the corresponding stable state open-circuit voltage acquisition battery of front voltage under Current Temperatures.
It, can be according to time electricity if not recorded in above-mentioned second mapping relations and working as front voltage under Current Temperatures Stream voltage integration obtains the current dump energy of the battery.Since time current voltage integration is surplus for obtaining battery The prior art of complementary energy does not repeat this.
The battery remaining power acquisition methods of the embodiment of the present invention, that detects battery works as front voltage and Current Temperatures;It looks into It looks in temperature, end voltage and the second mapping relations of stable state open-circuit voltage of the battery obtained in advance and whether having recorded in institute That states under Current Temperatures described works as front voltage;If described in there is under the Current Temperatures record in second mapping relations Work as front voltage, then according to working as under the Current Temperatures when the corresponding stable state open-circuit voltage of front voltage obtains the battery Preceding dump energy.The embodiment of the present invention is by considering influence of the temperature to dump energy, by end voltage and stable state open-circuit voltage Mapping relations be extended to temperature, hold voltage and stable state open-circuit voltage mapping relations, to realize more accurate acquisition battery Dump energy purpose.
7th embodiment
It is the flow chart of battery remaining power acquisition methods provided in an embodiment of the present invention referring to Fig. 7, Fig. 7, such as Fig. 7 institute Show, the battery remaining power acquisition methods of the embodiment of the present invention, comprising the following steps:
Step 701, detection battery work as front voltage and Current Temperatures.
In view of under the conditions of different temperature, the corresponding dump energy of identical stable state open-circuit voltage is not identical, That is the dump energy of battery is also related to temperature.Therefore, the variable of temperature is increased in the embodiment of the present invention, to realize The purpose of the dump energy of more accurate acquisition battery.
In the step, battery management system detection battery works as front voltage and Current Temperatures.
Temperature, end voltage and the second mapping of stable state open-circuit voltage for the battery that step 702, lookup obtain in advance are closed Work as front voltage described in whether being recorded under the Current Temperatures in system.
In the step, the second mapping relations obtained in advance are for the temperature of storage battery, end voltage and stable state open circuit electricity The corresponding relationship of pressure.
In general, different temperature ranges can be set, with the son mapping that each temperature range is the second mapping relations Relationship searches whether that record has in the corresponding sub- mapping relations of corresponding temperature range and works as front end electricity under Current Temperatures Pressure.Temperature range can be with 10 degree as a section, can be with 5 degree as a section, can be with 8 degree as an area Between, interval division is smaller, and the dump energy of acquisition is more accurate.
If being recorded in step 703, second mapping relations and working as front voltage described in having under the Current Temperatures, The current dump energy of the battery is obtained according to the corresponding stable state open-circuit voltage of front voltage of working as under the Current Temperatures.
In the step, if record has and works as front voltage under Current Temperatures in the second mapping relations, can according to The dump energy current when the corresponding stable state open-circuit voltage acquisition battery of front voltage under Current Temperatures.
If not recorded the current end voltage in step 704, second mapping relations, second mapping is searched Work as the smallest 4th end voltage of front end voltage phase difference amplitude with described in relationship.
In the step, works as front voltage if being not recorded under Current Temperatures in the second mapping relations, can search In second mapping relations and when the smallest 4th end voltage of front end voltage phase difference amplitude.
If step 705 is greater than one, and institute with the number when the smallest 4th end voltage of front end voltage phase difference amplitude It states the 4th end voltage and the front end voltage phase difference amplitude of working as is less than or equal to third preset value, then it will be with the Current Temperatures A the 4th end voltage under the smallest temperature value of difference amplitude is as the 4th end voltage of target.
Due in the second mapping relations there may be multiple identical end voltage datas corresponding from different temperature, In the step, if can pay the utmost attention to voltage with the immediate data more than one of front voltage is worked as and approach, i.e., first find and work as The immediate 4th end voltage of front voltage value, and judge these immediate the 4th end voltages and work as front end voltage phase difference amplitude Whether be less than or equal to third preset value, if these immediate the 4th end voltages be less than when front end voltage phase difference amplitude or Person is equal to third preset value, then the comparison temperature data again between these the 4th end voltages, amplitude will be differed with Current Temperatures most A the 4th end voltage under small temperature value is as the 4th end voltage of target.
Be weighted alternatively, it is also possible to voltage and temperature, voltage difference be Δ V=| V1-V1 '/V1+V1 ' |, temperature difference For Δ T=| T-T '/T+T ' | (V1, T are current detection data, and V1 ', T ' they are record data), difference parameter X=a Δ V+b Δ T, In view of voltage differences impact more greatly, a > b, such as a=3, b=2 can be set;Or a=3, b=1 etc..
Step 706, to obtain according to stable state open-circuit voltage corresponding with the 4th end voltage of target the battery current Dump energy.
In the step, battery management system can be according to corresponding with the 4th end voltage of target selected in step 705 steady State open-circuit voltage obtains the current dump energy of battery.
The battery remaining power acquisition methods of the embodiment of the present invention, that detects battery works as front voltage and Current Temperatures;It looks into It looks in temperature, end voltage and the second mapping relations of stable state open-circuit voltage of the battery obtained in advance and whether having recorded in institute That states under Current Temperatures described works as front voltage;If described in there is under the Current Temperatures record in second mapping relations Work as front voltage, then according to working as under the Current Temperatures when the corresponding stable state open-circuit voltage of front voltage obtains the battery Preceding dump energy;If not recorded the current end voltage in second mapping relations, searches second mapping and close Work as the smallest 4th end voltage of front end voltage phase difference amplitude with described in system;If with described when voltage phase difference amplitude in front end is the smallest The number of 4th end voltage is greater than one, then the 4th end that will be differed under the smallest temperature value of amplitude with the Current Temperatures Voltage is as the 4th end voltage of target;The battery is obtained according to stable state open-circuit voltage corresponding with the 4th end voltage of target Current dump energy.In the case that the embodiment of the present invention does not have corresponding end voltage data in mapping relations, pass through searching It is existing with when the immediate end voltage of front voltage in mapping relations, it is limited effectively to compensate for storing data in mapping relations Defect.
8th embodiment
It is the structure chart of battery management system provided in an embodiment of the present invention referring to Fig. 8, Fig. 8, as shown in figure 8, cell tube Reason system 800 includes:
First detection module 801 works as front voltage for detect battery.
First searching module 802, for search the battery obtained in advance end voltage and stable state open-circuit voltage the Whether the current end voltage has been recorded in one mapping relations.
First obtains module 803, if having the current end voltage for record in first mapping relations, according to The corresponding stable state open-circuit voltage of front voltage of working as obtains the current dump energy of the battery.
Optionally, as shown in figure 9, battery management system 800 further include:
Second detection module 804, if for the battery after stopping exporting energy and the output circuit of the battery is disconnected Voltage fluctuation range before opening is less than or equal to the first preset value, then detects the first end voltage of the battery.
Third detection module 805, if the time that the output circuit for the battery disconnects is more than or equal to default Between, then detect the first stable state open-circuit voltage of the battery.
Memory module 806, for storing the corresponding relationship of the first end voltage and the first stable state open-circuit voltage In first mapping relations.
Optionally, as shown in Figure 10, battery management system 800 further include:
Uploading module 807, for by first mapping relations the first end voltage and first stable state open The corresponding relationship of road voltage is uploaded in first server, and the first server is identical as the battery specifications for storing Battery end voltage and stable state open-circuit voltage mapping relations server.
Optionally, as shown in figure 11, battery management system 800 further include:
Second searching module 808, if being searched for not recorded the current end voltage in first mapping relations Work as the smallest second end voltage of front end voltage phase difference amplitude with described in first mapping relations.
Second obtains module 809, if for the second end voltage and it is described be less than when front end voltage phase difference amplitude or Equal to the second preset value, then the current residue of the battery is obtained according to stable state open-circuit voltage corresponding with the second end voltage Energy.
Optionally, as shown in figure 12, battery management system 800 further include:
Third searching module 8010, if being looked into for not recorded the current end voltage in first mapping relations Look in the mapping relations with other batteries of the battery same size stored in second server whether recorded with it is described When the corresponding third end voltage of front voltage.
Third obtains module 8011, if other with the battery same size for what is stored in the second server Record has third end voltage in the mapping relations of battery, then according to stable state open-circuit voltage corresponding with third end voltage Obtain the current dump energy of the battery.
Optionally, the first detection module 801 be used to detect battery when front voltage and Current Temperatures;
Temperature, end voltage and the stable state that first searching module 802 is used to search the battery obtained in advance are opened a way Work as front voltage described in whether being recorded under the Current Temperatures in second mapping relations of voltage;
If the first acquisition module 803 has the institute under the Current Temperatures for record in second mapping relations It states and works as front voltage, then the battery is obtained according to the corresponding stable state open-circuit voltage of front voltage of working as under the Current Temperatures Current dump energy.
Optionally, as shown in figure 13, battery management system 800 further include:
4th searching module 8012, if being looked into for not recorded the current end voltage in second mapping relations It looks in second mapping relations with described when the smallest 4th end voltage of front end voltage phase difference amplitude.
Selecting module 8013, if for described when the number of the smallest 4th end voltage of front end voltage phase difference amplitude is greater than One, and the 4th end voltage and the front end voltage phase difference amplitude of working as are less than or equal to third preset value, then it will be with institute A the 4th end voltage under the Current Temperatures difference the smallest temperature value of amplitude is stated as the 4th end voltage of target.
4th obtains module 8014, for obtaining institute according to stable state open-circuit voltage corresponding with the 4th end voltage of target State the current dump energy of battery.
In addition, battery management system can also include the 5th acquisition module, for according to time electricity in the embodiment of the present invention Stream voltage integration obtains the current dump energy of the battery.
Battery management system 800 can be realized each mistake that battery management system is realized in the embodiment of the method for Fig. 1 to Fig. 7 Journey, to avoid repeating, which is not described herein again.
The battery management system 800 of the embodiment of the present invention, that detects battery works as front voltage;Lookup obtains described in advance The current end voltage whether has been recorded in the end voltage of battery and the first mapping relations of stable state open-circuit voltage;If described first Record has the current end voltage in mapping relations, then works as front voltage corresponding stable state open-circuit voltage acquisition institute according to described State the current dump energy of battery.In this way, end voltage and stable state open-circuit voltage of the embodiment of the present invention by acquisition battery in advance Mapping relations, to realize the purpose for obtaining the accurate dump energy under the front voltage.
The invention further relates to a kind of electric cars, including the battery management system as shown in Fig. 8 to Figure 13, to avoid weight Multiple, which is not described herein again.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.

Claims (15)

1. a kind of battery remaining power acquisition methods characterized by comprising
Detection battery works as front voltage;
It searches the end voltage of the battery obtained in advance and whether is recorded in the first mapping relations of stable state open-circuit voltage It states and works as front voltage;
If record has the current end voltage in first mapping relations, according to described when the corresponding stable state of front voltage Open-circuit voltage obtains the current dump energy of the battery.
2. the method according to claim 1, wherein it is described detection battery work as front voltage the step of it Before, the method also includes:
If the battery stop export energy after and the battery output circuit disconnect before voltage fluctuation range be less than or Person is equal to the first preset value, then detects the first end voltage of the battery;
If the time that the output circuit of the battery disconnects is more than or equal to preset time, detect the battery first is steady State open-circuit voltage;
The corresponding relationship of the first end voltage and the first stable state open-circuit voltage is stored in first mapping relations.
3. according to the method described in claim 2, it is characterized in that, described by the first end voltage and first stable state The corresponding relationship of open-circuit voltage is stored in after the step in first mapping relations, the method also includes:
The corresponding relationship of the first end voltage and the first stable state open-circuit voltage in first mapping relations is uploaded Into first server, the first server is the end voltage and stable state for storing battery identical with the battery specifications The server of the mapping relations of open-circuit voltage.
4. method according to any one of claims 1 to 3, which is characterized in that in the electricity searched and obtained in advance After the step of whether having recorded the current end voltage in the end voltage in pond and the first mapping relations of stable state open-circuit voltage, institute State method further include:
If the current end voltage has not been recorded in first mapping relations, search in first mapping relations with it is described When the smallest second end voltage of front end voltage phase difference amplitude;
If the second end voltage and the front end voltage phase difference amplitude of working as are less than or equal to the second preset value, basis and institute It states the corresponding stable state open-circuit voltage of second end voltage and obtains the current dump energy of the battery.
5. method according to any one of claims 1 to 3, which is characterized in that in the electricity searched and obtained in advance After the step of whether having recorded the current end voltage in the end voltage in pond and the first mapping relations of stable state open-circuit voltage, institute State method further include:
If the current end voltage has not been recorded in first mapping relations, search stored in second server with it is described Whether recorded in the mapping relations of other batteries of battery same size with described when the corresponding third end voltage of front voltage;
If being recorded in the mapping relations with other batteries of the battery same size stored in the second server Third end voltage is stated, then the current residual energy of the battery is obtained according to stable state open-circuit voltage corresponding with third end voltage Amount.
6. method according to any one of claims 1 to 3, which is characterized in that the detection battery works as front voltage, packet It includes:
That detects battery works as front voltage and Current Temperatures;
Whether recorded in the end voltage and the first mapping relations of stable state open-circuit voltage of the battery that the lookup obtains in advance There is the current end voltage, comprising:
It searches and whether is recorded in temperature, end voltage and the second mapping relations of stable state open-circuit voltage of the battery obtained in advance Work as front voltage described in having under the Current Temperatures;
If record has the current end voltage in first mapping relations, according to described when the corresponding stable state of front voltage Open-circuit voltage obtains the current dump energy of the battery, comprising:
If in second mapping relations record have under the Current Temperatures described in work as front voltage, according to working as described The corresponding stable state open-circuit voltage of front voltage of working as at preceding temperature obtains the current dump energy of the battery.
7. according to the method described in claim 6, it is characterized in that, it is described search obtain in advance the battery temperature, After the step of whether having recorded the current end voltage in second mapping relations of end voltage and stable state open-circuit voltage, the side Method further include:
If the current end voltage has not been recorded in second mapping relations, search in second mapping relations with it is described When the smallest 4th end voltage of front end voltage phase difference amplitude;
If with described when the number of the smallest 4th end voltage of front end voltage phase difference amplitude is greater than one, and the 4th end voltage It is less than or equal to third preset value with the front end voltage phase difference amplitude of working as, then will differs amplitude minimum with the Current Temperatures Temperature value under a 4th end voltage as the 4th end voltage of target;
The current dump energy of the battery is obtained according to stable state open-circuit voltage corresponding with the 4th end voltage of target.
8. a kind of battery management system characterized by comprising
First detection module works as front voltage for detect battery;
First searching module is closed for searching the first mapping of end voltage and stable state open-circuit voltage of the battery obtained in advance Whether the current end voltage has been recorded in system;
First obtains module, if having the current end voltage for record in first mapping relations, basis is worked as with described The corresponding stable state open-circuit voltage of front voltage obtains the current dump energy of the battery.
9. system according to claim 8, which is characterized in that further include:
Second detection module, if the electricity for the battery after stopping output energy and before the output circuit disconnection of the battery It presses fluctuating range to be less than or equal to the first preset value, then detects the first end voltage of the battery;
Third detection module is examined if the time that the output circuit for the battery disconnects is more than or equal to preset time Survey the first stable state open-circuit voltage of the battery;
Memory module, for the corresponding relationship of the first end voltage and the first stable state open-circuit voltage to be stored in described In one mapping relations.
10. system according to claim 9, which is characterized in that further include:
Uploading module, for by the first end voltage and the first stable state open-circuit voltage in first mapping relations Corresponding relationship is uploaded in first server, and the first server is for storing battery identical with the battery specifications Hold the server of the mapping relations of voltage and stable state open-circuit voltage.
11. according to the described in any item systems of claim 8 to 10, which is characterized in that further include:
Second searching module, if searching described for not recorded the current end voltage in first mapping relations Work as the smallest second end voltage of front end voltage phase difference amplitude with described in one mapping relations;
Second obtains module, if being less than or equal to second for the second end voltage and the front end voltage phase difference amplitude of working as Preset value then obtains the current dump energy of the battery according to stable state open-circuit voltage corresponding with the second end voltage.
12. according to the described in any item systems of claim 8 to 10, which is characterized in that further include:
Third searching module, if searching the second clothes for not recorded the current end voltage in first mapping relations Whether recorded in the mapping relations with other batteries of the battery same size stored in business device with described when front end electricity Press corresponding third end voltage;
Third obtains module, if reflecting for storing in the second server with other batteries of the battery same size Penetrating record in relationship has third end voltage, then according to stable state open-circuit voltage corresponding with third end voltage acquisition The current dump energy of battery.
13. according to the described in any item systems of claim 8 to 10, which is characterized in that the first detection module is for detecting Battery works as front voltage and Current Temperatures;
First searching module is used to search the of the temperature of the battery obtained in advance, end voltage and stable state open-circuit voltage Work as front voltage described in whether being recorded under the Current Temperatures in two mapping relations;
If the first acquisition module has described current under the Current Temperatures for record in second mapping relations Hold voltage, then according under the Current Temperatures when to obtain the battery current for front voltage corresponding stable state open-circuit voltage Dump energy.
14. system according to claim 13, which is characterized in that further include:
4th searching module, if searching described for not recorded the current end voltage in second mapping relations Work as the smallest 4th end voltage of front end voltage phase difference amplitude with described in two mapping relations;
Selecting module, if for being greater than one with the number when the smallest 4th end voltage of front end voltage phase difference amplitude, and The 4th end voltage and the front end voltage phase difference amplitude of working as are less than or equal to third preset value, then will be with the current temperature A the 4th end voltage under the smallest temperature value of difference amplitude is spent as the 4th end voltage of target;
4th obtains module, works as obtaining the battery according to stable state open-circuit voltage corresponding with the 4th end voltage of target Preceding dump energy.
15. a kind of electric car, which is characterized in that including the described in any item battery management systems of such as claim 8 to 14.
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