CN106553551A - A kind of battery remaining power acquisition methods, battery management system and electric automobile - Google Patents

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

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Publication number
CN106553551A
CN106553551A CN201611027304.2A CN201611027304A CN106553551A CN 106553551 A CN106553551 A CN 106553551A CN 201611027304 A CN201611027304 A CN 201611027304A CN 106553551 A CN106553551 A CN 106553551A
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China
Prior art keywords
voltage
battery
terminal voltage
mapping relations
stable state
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CN201611027304.2A
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Chinese (zh)
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CN106553551B (en
Inventor
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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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION 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
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/12—Recording operating variables ; Monitoring of operating variables
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION 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
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/3644—Constructional arrangements
    • G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION 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
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/547—Voltage
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy 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 automobile, and wherein method includes：That detects battery works as front voltage；Whether the current terminal voltage has been recorded in searching the terminal voltage of the battery and the first mapping relations of stable state open-circuit voltage for obtaining in advance；If record has a current terminal 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.So, mapping relations of the embodiment of the present invention by the terminal voltage and stable state open-circuit voltage of acquisition battery in advance, to realize obtaining when the purpose of accurate dump energy under front voltage.

Description

A kind of battery remaining power acquisition methods, battery management system and electric automobile
Technical field
The present invention relates to technical field of battery management, more particularly to the control of a kind of battery remaining power acquisition methods, battery System and electric automobile.
Background technology
Battery is many electrical equipments, one of main stored energy power source of such as electric automobile, in order to ensure whole battery The stable operation of system, needs the parameters to battery, and especially battery remaining power carries out real-time monitoring.Traditional battery Dump energy acquisition methods mainly have time current/voltage integration method, and the method is suffered from the drawback that：Due to depositing for hysteresis voltage There is certain difference between actually measured magnitude of voltage and actual value；Miss for detecting that the current sensor of electric current is present , between actually measured current value and actual value, there is certain difference in difference.Therefore, using remaining that time current integration method is obtained Complementary energy certainly exists cumulative error with accumulated time, causes final result inaccurate.It can be seen that, existing battery remaining power is obtained The method of taking there is a problem of not accurate enough.
The content of the invention
The embodiment of the present invention provides a kind of battery remaining power acquisition methods, battery management system and electric automobile, to solve Certainly existing battery remaining power acquisition methods there is a problem of not accurate enough.
In a first aspect, a kind of battery remaining power acquisition methods are embodiments provided, including：
That detects battery works as front voltage；
Whether record in searching the terminal voltage of the battery of acquisition and the first mapping relations of stable state open-circuit voltage in advance There is the current terminal voltage；
If record has the current terminal 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, including：
First detection module, works as front voltage for detect battery；
First searching modul, the terminal voltage of the battery for searching advance acquisition are reflected with the first of stable state open-circuit voltage Penetrate；
First acquisition module, if having the current terminal voltage, basis and institute for record in first mapping relations State the current dump energy of the battery is obtained when the corresponding stable state open-circuit voltage of front voltage.
The third aspect, the embodiment of the present invention also provide a kind of electric automobile, including above-mentioned battery management system.
So, in the embodiment of the present invention, that detects battery works as front voltage；Search the end electricity of the battery for obtaining in advance Whether the current terminal voltage 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 terminal voltage, then according to described when the corresponding stable state open-circuit voltage of front voltage, to obtain the battery current Dump energy.So, mapping relations of the embodiment of the present invention by the terminal voltage and stable state open-circuit voltage of acquisition battery in advance, To realize obtaining when the purpose of accurate dump energy under front voltage.
Description of the drawings
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below will be to needed for embodiment of the present invention description Accompanying drawing to be used is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, For those of ordinary skill in the art, without having to pay creative labor, can be being obtained according to these accompanying drawings Take other accompanying drawings.
Fig. 1 is the flow chart of the battery remaining power acquisition methods that first embodiment of the invention is provided；
Fig. 2 is the flow chart of the battery remaining power acquisition methods that second embodiment of the invention is provided；
Fig. 2-1 is the change in voltage figure before and after the battery output circuit that second embodiment of the invention is provided disconnects；
Fig. 3 is the flow chart of the battery remaining power acquisition methods that third embodiment of the invention is provided；
Fig. 4 is the flow chart of the battery remaining power acquisition methods that fourth embodiment of the invention is provided；
Fig. 5 is the flow chart of the battery remaining power acquisition methods that fifth embodiment of the invention is provided；
Fig. 6 is the flow chart of the battery remaining power acquisition methods that sixth embodiment of the invention is provided；
Fig. 7 is the flow chart of the battery remaining power acquisition methods that seventh embodiment of the invention is provided；
Fig. 8 is one of structure chart of battery management system that eighth embodiment of the invention is provided；
Fig. 9 is the two of the structure chart of the battery management system that eighth embodiment of the invention is provided；
Figure 10 is the three of the structure chart of the battery management system that eighth embodiment of the invention is provided；
Figure 11 is the four of the structure chart of the battery management system that eighth embodiment of the invention is provided；
Figure 12 is the five of the structure chart of the battery management system that eighth embodiment of the invention is provided；
Figure 13 is the six of the structure chart of the battery management system that eighth embodiment of the invention is provided.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation is described, it is clear that described embodiment is a part of embodiment of the invention, rather than the embodiment of whole.Based on this Embodiment in bright, the acquired every other enforcement under the premise of creative work is not made of those of ordinary skill in the art Example, belongs to the scope of protection of the invention.
First embodiment
Referring to Fig. 1, Fig. 1 is the flow chart of battery remaining power acquisition methods provided in an embodiment of the present invention, such as Fig. 1 institutes Show that the battery remaining power acquisition methods of the embodiment of the present invention are comprised 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 follow-up all embodiments are applied to all with battery work For the electrical equipment in main stored energy power source, such as electric bicycle, electric automobile etc., in order to make it easy to understand, the present invention is implemented Example and follow-up all embodiments are illustrated by taking electric automobile as an example.
In the step, above-mentioned detection battery when front voltage is in electric automobile normally travel, the electricity of electric automobile The terminal voltage at the battery current time that pond management system is detected.Above-mentioned normally travel can include but is not limited to steady row Sail, give it the gun, descent run or climbing traveling situations such as.Wherein, the terminal 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 two ends.
In the terminal voltage of the battery and the first mapping relations of stable state open-circuit voltage that step 102, lookup are obtained in advance Whether record has the current terminal voltage.
Above-mentioned terminal voltage is advance by the battery management system of electric automobile with the first mapping relations of stable state open-circuit voltage Obtain.Above-mentioned first mapping relations can be battery management system to its cells under certain operating mode, such as battery Before and after output circuit disconnects, test side voltage data and stable state open-circuit voltage data and obtain.Above-mentioned first mapping relations can In the form of being presented as curve chart, it is also possible to be presented as the form of form, the form of function is may be embodied in, in this regard, this Bright embodiment is simultaneously not construed as limiting.
Wherein, the stable state open-circuit voltage of the embodiment of the present invention refers to battery in the case of disconnecting consumers, when certain Between after, such as 20 minutes, 30 minutes, 40 minutes or 60 minutes etc., the magnitude of voltage at measured battery two ends.Time gets over Long, the stable state open-circuit voltage for measuring gets over the potential that tends to balance.
In the step, the current voltage value detected in whether recording step 101 in requiring to look up the first mapping relations.
If record has the current terminal voltage in step 103, first mapping relations, basis is with described when front end electricity 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, 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 i.e. available corresponding with stable state open-circuit voltage values by inquiring about the fitting function curve Accurate residual energy value.Accordingly, it is possible to the functional relationship according to stable state open-circuit voltage values with battery remaining power is obtained The current dump energy of battery under current electricity side pressure.
If do not record in the first mapping relations that step 101 detects works as front voltage, can be according to time current Voltage integration obtains the current dump energy of battery.As time current voltage integration is for obtaining battery remaining power Prior art, this is not repeated.
In addition, when failing to get in advance the first mapping relations of terminal voltage and stable state open-circuit voltage, except can be with root Outside the current dump energy of battery is obtained according to time current voltage integration, terminal voltage can also be given with stable state open-circuit voltage Correspondence setting initial value, initial value can be from getting terminal voltage with other batteries of the same specification of its cells After the first mapping relations of stable state open-circuit voltage, the corresponding relation of terminal voltage and stable state open-circuit voltage is stored and shares. After it can get the first mapping relations in advance, battery management system can be updated to above-mentioned initial value.
In the embodiment of the present invention, although there is between the stable state open-circuit voltage of battery and its dump energy corresponding fitting letter Number curve, however, stable state open-circuit voltage can not be measured in electric automobile actual travel in real time obtaining, the actual row of electric automobile Sail that middle can measure in real time is terminal voltage.In consideration of it, the embodiment of the present invention is opened with stable state by the terminal voltage for obtaining battery in advance The mapping relations of road voltage, you can realize the purpose by the accurate dump energy of terminal voltage indirect gain.
The battery remaining power acquisition methods of the embodiment of the present invention, detect battery work as front voltage；Search and obtain in advance The terminal voltage of the battery and the first mapping relations of stable state open-circuit voltage in whether recorded the current terminal voltage；If institute Stating record in the first mapping relations has the current terminal voltage, then according to described when the corresponding stable state open-circuit voltage of front voltage Obtain the current dump energy of the battery.So, the embodiment of the present invention is opened with stable state by the terminal voltage for obtaining battery in advance The mapping relations of road voltage, to realize obtaining when the purpose of accurate dump energy 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 institutes Show that the battery remaining power acquisition methods of the embodiment of the present invention are comprised the following steps：
If the voltage wave of step 201, the battery after output energy is stopped and before the output circuit disconnection of the battery Dynamic amplitude is less than or equal to the first preset value, then detect the first terminal voltage of the battery.
In the embodiment of the present invention, step 201 to step 203 can be understood as the terminal voltage and stable state open-circuit voltage of battery The concrete acquisition methods of the first mapping relations.
In the embodiment of the present invention, setting obtains the operating mode of terminal voltage and stable state open-circuit voltage, in simple terms, can be divided into point Not Huo Qu terminal voltage and stable state open-circuit voltage two little operating modes.First operating mode is used to obtain terminal voltage, and the second operating mode is used to obtain Take stable state open-circuit voltage.
In the step, after stopping exports energy, (such as electric automobile is gently travelled up to parking battery by inertia Process, or electric automobile descending neutral gear slides), and (for example pull key flame-out before the output circuit of the battery disconnects Before), and the fluctuating margin of voltage is less than or equal to the first preset value, such as voltage pulsation amplitude (can also be current fluctuation Amplitude, voltage pulsation Amplitude Ratio current fluctuation amplitude are more accurate) less than or equal to ± 0.2mv, or voltage pulsation amplitude Less than or equal to ± 0.1mv, it is believed that reached the requirement of the first operating mode, battery management system detects voltage now As the first terminal voltage.Wherein, the first operating mode can be the operating mode residing for T2 as shown in Fig. 2-1 interval.
If the time that the output circuit of step 202, the battery disconnects is more than or equal to Preset Time, detection is described First stable state open-circuit voltage of battery.
In the step, battery (for example pulls key flame-out rear) after output circuit disconnection and waits certain hour, including polarization Voltage is constantly decreased to negligible degree in interior hysteresis voltage, 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, you can think to reach The requirement of the second operating mode, battery management system detect the first stable state open-circuit voltage now.Wherein, the second operating mode can be as Operating mode residing for T3 shown in Fig. 2-1 is interval.
Step 203, the corresponding relation of first terminal voltage and the first stable state open-circuit voltage is stored in into described In one mapping relations.
In the step, the first stable state open-circuit voltage that will be detected in the first terminal voltage detected in step 201 and step 202 Relation 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 in electric automobile normally travel, the electricity of electric automobile The terminal voltage at the battery current time that pond management system is detected.Above-mentioned normally travel can include but is not limited to steady row Sail, give it the gun, descent run or climbing traveling situations such as.Wherein, the terminal 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 two ends.
Whether the current terminal voltage has been recorded in step 205, lookup first mapping relations.
Above-mentioned first mapping relations can be obtained by step 203, be by the battery management system of electric automobile Under certain operating mode, such as before and after the output circuit of battery disconnects, 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 refers to battery in the case of disconnecting consumers, when certain Between after, such as 20 minutes, 30 minutes, 40 minutes or 60 minutes etc., the magnitude of voltage at measured battery two ends.Time gets over Long, the stable state open-circuit voltage for measuring gets over the potential that tends to balance.
In the step, the current voltage value detected in whether recording step 204 in requiring to look up the first mapping relations.
If record has the current terminal voltage in step 206, first mapping relations, basis is with described when front end electricity 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, 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 current residual energy of battery under current electricity side pressure according to stable state open-circuit voltage values and the functional relationship of battery remaining power Amount.
If do not record in the first mapping relations that step 204 detects works as front voltage, can be according to time current Voltage integration obtains the current dump energy of battery.As time current voltage integration is for obtaining battery remaining power Prior art, this is not repeated.
In addition, failing to experience step 201 to before step 203, except obtaining according to time current voltage integration Outside the current dump energy in power taking pond, the correspondence setting initial value of terminal voltage and stable state open-circuit voltage can also be given, just Initial value can be from storing to step 203 in experience step 201 with other batteries of the same specification of its cells and Share the corresponding relation of terminal voltage and stable state open-circuit voltage, in experience step 201 to step 203, battery management system can To be updated to above-mentioned initial value.
It should be noted that step 201 both can be performed before the step 204 to step 203, it is also possible in step 206 Perform afterwards, step 201 to step 203 can be repeated with step 204 to step 206, above step is one dynamic Process.
The battery remaining power acquisition methods of the embodiment of the present invention, if the battery stop output energy after and the electricity Voltage pulsation amplitude before the output circuit in pond disconnects is less than or equal to the first preset value, then detect 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 relation of first terminal voltage and the first stable state open-circuit voltage is stored in described first to reflect Penetrate in relation；That detects battery works as front voltage；Search the terminal voltage and stable state open-circuit voltage of the battery for obtaining in advance Whether the current terminal 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.So, originally Inventive embodiments by presetting certain battery status, when battery management system judge battery be in the battery status when, The terminal 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 process that reason system learns to its cells, has been better achieved and has obtained when the purpose of accurate dump energy under front voltage.
3rd embodiment
Referring to Fig. 3, Fig. 3 is the flow chart of battery remaining power acquisition methods provided in an embodiment of the present invention, such as Fig. 3 institutes Show that the battery remaining power acquisition methods of the embodiment of the present invention are comprised the following steps：
If the voltage wave of step 301, the battery after output energy is stopped and before the output circuit disconnection of the battery Dynamic amplitude is less than or equal to the first preset value, then detect the first terminal voltage of the battery.
In the embodiment of the present invention, step 301 to step 303 can be understood as the terminal voltage and stable state open-circuit voltage of battery The concrete acquisition methods of the first mapping relations.
In the embodiment of the present invention, setting obtains the operating mode of terminal voltage and stable state open-circuit voltage, in simple terms, can be divided into point Not Huo Qu terminal voltage and stable state open-circuit voltage two little operating modes.First operating mode is used to obtain terminal voltage, and the second operating mode is used to obtain Take stable state open-circuit voltage.
In the step, after stopping exports energy, (such as electric automobile is gently travelled up to parking battery by inertia Process, or electric automobile descending neutral gear slides), and (for example pull key flame-out before the output circuit of the battery disconnects Before), and the fluctuating margin of voltage is less than or equal to the first preset value, such as voltage pulsation amplitude (can also be current fluctuation Amplitude, voltage pulsation Amplitude Ratio current fluctuation amplitude are more accurate) less than or equal to ± 0.2mv, or voltage pulsation amplitude Less than or equal to ± 0.1mv, it is believed that reached the requirement of the first operating mode, battery management system detects voltage now As the first terminal voltage.
If the time that the output circuit of step 302, the battery disconnects is more than or equal to Preset Time, detection is described First stable state open-circuit voltage of battery.
In the step, battery (for example pulls key flame-out rear) after output circuit disconnection and waits certain hour, including polarization Voltage is constantly decreased to negligible degree in interior hysteresis voltage, 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, you can think to reach The requirement of the second operating mode, battery management system detect the first stable state open-circuit voltage now.
Step 303, the corresponding relation of first terminal voltage and the first stable state open-circuit voltage is stored in into described In one mapping relations.
In the step, the first stable state open-circuit voltage that will be detected in the first terminal voltage detected in step 201 and step 202 Relation correspond, and be stored in the first mapping relations.
Step 304, by first terminal voltage and the first stable state open-circuit voltage in first mapping relations Corresponding relation is uploaded in first server, and the first server is for storage and the battery specifications identical battery The server of the mapping relations of terminal voltage and stable state open-circuit voltage.
Failing to experience step 301 to before step 303, corresponding relation that can be to terminal voltage with stable state open-circuit voltage sets Put initial value, initial value can be from other batteries of the same specification of its cells experience step 301 to step 303 it Store and share the corresponding relation of terminal voltage and stable state open-circuit voltage afterwards, in experience step 301 to step 303, battery Management system can be updated to above-mentioned initial value.
Likewise, the terminal voltage in the step, in the first mapping relations that step 303 can be obtained by battery management system And during the corresponding relation of stable state open-circuit voltage uploads onto the server, can share with the battery system of other same sizes.Share Mode for example can be downloaded with upload server, or by other battery systems in the server.
Wherein, above-mentioned server could be for storing and be opened with stable state with the terminal voltage of its cells specification identical battery The server of the mapping relations of road voltage, can also be and opened a way with stable state for the terminal voltage for storing the battery of various battery specifications 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 in electric automobile normally travel, the electricity of electric automobile The terminal voltage at the battery current time that pond management system is detected.Above-mentioned normally travel can include but is not limited to steady row Sail, give it the gun, descent run or climbing traveling situations such as.Wherein, the terminal 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 two ends.
Whether the current terminal voltage has been recorded in step 306, lookup first mapping relations.
Above-mentioned first mapping relations can be obtained by step 303, be by the battery management system of electric automobile Under certain operating mode, such as before and after the output circuit of battery disconnects, test side voltage data and stable state open-circuit voltage data and obtain .
In the step, the current voltage value detected in whether recording step 204 in requiring to look up the first mapping relations.
If record has the current terminal voltage in step 307, first mapping relations, basis is with described when front end electricity 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, 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 current residual energy of battery under current electricity side pressure according to stable state open-circuit voltage values and the functional relationship of battery remaining power Amount.
If do not record in the first mapping relations that step 305 detects works as front voltage, can be according to time current Voltage integration obtains the current dump energy of battery.As time current voltage integration is for obtaining battery remaining power Prior art, this is not repeated.
Wherein, the stable state open-circuit voltage of the embodiment of the present invention refers to battery in the case of disconnecting consumers, when certain Between after, such as 20 minutes, 30 minutes, 40 minutes or 60 minutes etc., the magnitude of voltage at measured battery two ends.Time gets over Long, the stable state open-circuit voltage for measuring gets over the potential that tends to balance.
It should be noted that step 304 and step 305 are to the restriction that order is not carried out between step 307, i.e. step 304 can perform before step 305, it is also possible to after the either step of step 305 to step 307 perform, can 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 output energy after and the electricity Voltage pulsation amplitude before the output circuit in pond disconnects is less than or equal to the first preset value, then detect 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 relation of first terminal voltage and the first stable state open-circuit voltage is stored in described first to reflect Penetrate in relation；By the corresponding relation of first terminal voltage and the first stable state open-circuit voltage in first mapping relations Be uploaded in first server, the first server be for storage and the terminal voltage of the battery specifications identical battery with The server of the mapping relations of stable state open-circuit voltage；That detects battery works as front voltage；Search the advance battery for obtaining Whether the current terminal voltage has been recorded in terminal voltage and the first mapping relations of stable state open-circuit voltage；If first mapping is closed In system, record has the current terminal voltage, then according to described when the corresponding stable state open-circuit voltage of front voltage obtains the battery Current dump energy.So, the embodiment of the present invention is obtained when accurate dump energy under front voltage except realizing Purpose outside, by the corresponding relation between terminal voltage and stable state open-circuit voltage is uploaded onto the server, electricity can also be realized Pond mapping relations are shared.
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 institutes Show that the battery remaining power acquisition methods of the embodiment of the present invention are comprised the following steps：
Step 401, detection battery work as front voltage.
In the step, above-mentioned detection battery when front voltage is in electric automobile normally travel, the electricity of electric automobile The terminal voltage at the battery current time that pond management system is detected.Above-mentioned normally travel can include but is not limited to steady row Sail, give it the gun, descent run or climbing traveling situations such as.Wherein, the terminal 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 two ends.
In the terminal voltage of the battery and the first mapping relations of stable state open-circuit voltage that step 402, lookup are obtained in advance Whether record has the current terminal voltage.
Above-mentioned terminal voltage is advance by the battery management system of electric automobile with the first mapping relations of stable state open-circuit voltage Obtain.Above-mentioned first mapping relations can be battery management system to its cells under certain operating mode, such as battery Before and after output circuit disconnects, test side voltage data and stable state open-circuit voltage data and obtain.Above-mentioned first mapping relations can In the form of being presented as curve chart, it is also possible to be presented as the form of form, the form of function is may be embodied in, in this regard, this Bright embodiment is simultaneously not construed as limiting.
Wherein, the stable state open-circuit voltage of the embodiment of the present invention refers to battery in the case of disconnecting consumers, when certain Between after, such as 20 minutes, 30 minutes, 40 minutes or 60 minutes etc., the magnitude of voltage at measured battery two ends.Time gets over Long, the stable state open-circuit voltage for measuring gets over the potential that tends to balance.
In the step, the current voltage value detected in whether recording step 101 in requiring to look up the first mapping relations.
If record has the current terminal voltage in step 403, first mapping relations, basis is with described when front end electricity 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, 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 current residual energy of battery under current electricity side pressure according to stable state open-circuit voltage values and the functional relationship of battery remaining power Amount.
If the current terminal voltage has not been recorded in step 404, first mapping relations, search first mapping With described when front voltage differs the second minimum terminal voltage of amplitude in relation.
In the embodiment of the present invention, the data volume of the terminal voltage stored in the first mapping relations for being obtained due to early stage in advance is also It is insufficient, it is impossible to find complete corresponding terminal voltage value, for example, when front voltage is 3.2V, but in the first mapping relations simultaneously Corresponding stable state open-circuit voltage values when no storage is 3.2V with terminal voltage.
Now, in the step, can look for immediate with above-mentioned terminal voltage, that is, differ the minimum record of amplitude to determine Corresponding stable state open-circuit voltage.For example, it is 3.15V that in the first mapping relations, record has with the immediate terminal voltages of 3.2V, and is held When voltage is 3.15V, corresponding stable state open-circuit voltage is 3.19V, it is determined that stable state open-circuit voltage now is 3.19V.
If step 405, second terminal voltage are preset less than or equal to second when front voltage differs amplitude with described Value, then obtain the current dump energy of the battery according to stable state open-circuit voltage corresponding with second terminal voltage.
In the step, can using difference amplitude less than or equal to the second preset value terminal voltage 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., so, battery management System can obtain corresponding dump energy according to the stable state open-circuit voltage of 3.19V.
If above-mentioned second terminal voltage differs amplitude more than above-mentioned second preset value with when front voltage, can be according to the time Current/voltage integration method obtains the current dump energy of the battery.As time current voltage integration is for obtaining battery The prior art of dump energy, does not repeat to this.
The embodiment of the present invention equally can be carried out with reference to the embodiment shown in Fig. 2 and Fig. 3, to avoid repeating, to this Do not repeat.
The battery remaining power acquisition methods of the embodiment of the present invention, detect battery work as front voltage；Search and obtain in advance The terminal voltage of the battery and the first mapping relations of stable state open-circuit voltage in whether recorded the current terminal voltage；If institute Stating record in the first mapping relations has the current terminal 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 the current terminal voltage has not been recorded in first mapping relations, search With described when front voltage differs the second minimum terminal voltage of amplitude in first mapping relations；According to electric with second end Corresponding stable state open-circuit voltage is pressed to obtain the current dump energy of the battery.So, the embodiment of the present invention is in mapping relations In the case of without corresponding terminal voltage data, by finding existing in mapping relations and working as the immediate end electricity of front voltage Pressure, effectively compensate for the limited defect of data storage in mapping relations.
5th embodiment
Referring to Fig. 5, Fig. 5 is the flow chart of battery remaining power acquisition methods provided in an embodiment of the present invention, such as Fig. 5 institutes Show that the battery remaining power acquisition methods of the embodiment of the present invention are comprised the following steps：
Step 501, detection battery work as front voltage.
In the step, above-mentioned detection battery when front voltage is in electric automobile normally travel, the electricity of electric automobile The terminal voltage at the battery current time that pond management system is detected.Above-mentioned normally travel can include but is not limited to steady row Sail, give it the gun, descent run or climbing traveling situations such as.Wherein, the terminal 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 two ends.
In the terminal voltage of the battery and the first mapping relations of stable state open-circuit voltage that step 502, lookup are obtained in advance Whether record has the current terminal voltage.
Above-mentioned terminal voltage is advance by the battery management system of electric automobile with the first mapping relations of stable state open-circuit voltage Obtain.Above-mentioned first mapping relations can be battery management system to its cells under certain operating mode, such as battery Before and after output circuit disconnects, test side voltage data and stable state open-circuit voltage data and obtain.Above-mentioned first mapping relations can In the form of being presented as curve chart, it is also possible to be presented as the form of form, the form of function is may be embodied in, in this regard, this Bright embodiment is simultaneously not construed as limiting.
Wherein, the stable state open-circuit voltage of the embodiment of the present invention refers to battery in the case of disconnecting consumers, when certain Between after, such as 20 minutes, 30 minutes, 40 minutes or 60 minutes etc., the magnitude of voltage at measured battery two ends.Time gets over Long, the stable state open-circuit voltage for measuring gets over the potential that tends to balance.
In the step, the current voltage value detected in whether recording step 101 in requiring to look up the first mapping relations.
If record has the current terminal voltage in step 503, first mapping relations, basis is with described when front end electricity 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, 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 current residual energy of battery under current electricity side pressure according to stable state open-circuit voltage values and the functional relationship of battery remaining power Amount.
If the current terminal voltage has not been recorded 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 described when front voltage is corresponding The 3rd terminal voltage.
In the step, if do not record in above-mentioned first mapping relations that step 501 detects works as front voltage, cell tube In the mapping relations with other batteries of its cells same size that reason system is stored in can searching second server whether Record has the 3rd terminal voltage corresponding with front voltage is worked as.
If storing in step 505, the second server closed with other batteries of battery same size mappings In system, record has the 3rd terminal voltage, then obtain the battery according to stable state open-circuit voltage corresponding with the 3rd terminal voltage Current dump energy.
In the step, if in the mapping relations with other batteries of its cells same size stored in second server Record has the 3rd terminal voltage corresponding with front voltage is worked as, then can be obtained according to stable state open-circuit voltage corresponding with the 3rd terminal voltage The current dump energy in power taking pond.
When later stage battery management system has got the mapping of new the 3rd terminal voltage value Yu the stable state open-circuit voltage of itself Relation, then can be replaced, be updated to the mapping relations obtained from second server with new mapping relations.
If not recording in the mapping relations with other batteries of the battery same size stored in above-mentioned second server There is above-mentioned 3rd terminal voltage, then the current dump energy of the battery can be obtained according to time current voltage integration.Due to Time current voltage integration is, for the prior art for obtaining battery remaining power, this not to be repeated.
It should be noted that the mapping with other batteries of the battery same size can be only stored in second server In relation, it is also possible to 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, or different servers.
The battery remaining power acquisition methods of the embodiment of the present invention, detect battery work as front voltage；Search and obtain in advance The terminal voltage of the battery and the first mapping relations of stable state open-circuit voltage in whether recorded the current terminal voltage；If institute Stating record in the first mapping relations has the current terminal 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 the current terminal voltage has not been recorded in first mapping relations, search Whether record in the mapping relations with other batteries of the battery same size stored in second server and worked as with described Corresponding 3rd terminal voltage of front voltage；If other batteries with the battery same size stored in the second server Mapping relations in record have the 3rd terminal voltage, then according to stable state open-circuit voltage corresponding with the 3rd terminal voltage obtain The current dump energy of the battery.The embodiment of the present invention in mapping relations in the case of no corresponding terminal voltage data, By find store in the server with when the immediate terminal voltage of front voltage, effectively compensate for storing in mapping relations The limited defect of data.
Sixth embodiment
Referring to Fig. 6, Fig. 6 is the flow chart of battery remaining power acquisition methods provided in an embodiment of the present invention, such as Fig. 6 institutes Show that the battery remaining power acquisition methods of the embodiment of the present invention are comprised the following steps：
Step 601, detection battery when front voltage and Current Temperatures.
In view of under different temperature conditionss, the corresponding dump energy of identical stable state open-circuit voltage is simultaneously differed, 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 battery is obtained more accurately.
In the step, battery management system detection battery when front voltage and Current Temperatures.
Second mapping of step 602, the temperature for searching the battery for obtaining in advance, terminal voltage and stable state open-circuit voltage is closed Whether record in system described under the Current Temperatures and work as front voltage.
In the step, the second mapping relations for obtaining in advance are used for temperature, terminal voltage and the stable state open circuit electricity of storage battery The corresponding relation of pressure.
In general, different temperature ranges can be set, with the son mapping that each temperature range is the second mapping relations Relation, search whether to record in the corresponding sub- mapping relations of corresponding temperature range under Current Temperatures when front end electricity Pressure.Temperature range can be interval with 10 degree as one, can be interval with 5 degree as one, can be with 8 degree as an area Between, interval division is less, and the dump energy of acquisition is more accurate.
If recording to have described under the Current Temperatures in step 603, second mapping relations and working as front voltage, According to the dump energy current when the front voltage corresponding stable state open-circuit voltage acquisition battery 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.
Work as front voltage if not recording in above-mentioned second mapping relations under Current Temperatures, can be according to time electricity Stream voltage integration obtains the current dump energy of the battery.As time current voltage integration is remained for obtaining battery The prior art of complementary energy, does not repeat to this.
The battery remaining power acquisition methods of the embodiment of the present invention, detect battery when front voltage and Current Temperatures；Look into Look for and whether having recorded in institute in the second mapping relations of the temperature, terminal voltage and stable state open-circuit voltage of the battery of acquisition in advance That states under Current Temperatures described works as front voltage；If in second mapping relations there being described under the Current Temperatures record Work as front voltage, then work as when the corresponding stable state open-circuit voltage of front voltage obtains the battery according under the Current Temperatures Front dump energy.The embodiment of the present invention passes through to consider impact of the temperature to dump energy, by terminal voltage and stable state open-circuit voltage Mapping relations expand to the mapping relations of temperature, terminal voltage and stable state open-circuit voltage, to realize more accurately obtaining battery Dump energy purpose.
7th embodiment
Referring to Fig. 7, Fig. 7 is the flow chart of battery remaining power acquisition methods provided in an embodiment of the present invention, such as Fig. 7 institutes Show that the battery remaining power acquisition methods of the embodiment of the present invention are comprised the following steps：
Step 701, detection battery when front voltage and Current Temperatures.
In view of under different temperature conditionss, the corresponding dump energy of identical stable state open-circuit voltage is simultaneously differed, 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 battery is obtained more accurately.
In the step, battery management system detection battery when front voltage and Current Temperatures.
Second mapping of step 702, the temperature for searching the battery for obtaining in advance, terminal voltage and stable state open-circuit voltage is closed Whether record in system described under the Current Temperatures and work as front voltage.
In the step, the second mapping relations for obtaining in advance are used for temperature, terminal voltage and the stable state open circuit electricity of storage battery The corresponding relation of pressure.
In general, different temperature ranges can be set, with the son mapping that each temperature range is the second mapping relations Relation, search whether to record in the corresponding sub- mapping relations of corresponding temperature range under Current Temperatures when front end electricity Pressure.Temperature range can be interval with 10 degree as one, can be interval with 5 degree as one, can be with 8 degree as an area Between, interval division is less, and the dump energy of acquisition is more accurate.
If recording to have described under the Current Temperatures in step 703, second mapping relations and working as front voltage, According to the dump energy current when the front voltage corresponding stable state open-circuit voltage acquisition battery 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 the current terminal voltage has not been recorded in step 704, second mapping relations, search second mapping With described when front voltage differs the 4th minimum terminal voltage of amplitude in relation.
In the step, if being not recorded in working as front voltage under Current Temperatures in the second mapping relations, can search The 4th minimum terminal voltage of amplitude is differed with when front voltage in second mapping relations.
If step 705, with described when front voltage differs the number of the 4th minimum terminal voltage of amplitude more than one, and institute The 4th terminal voltage is stated with described when front voltage differs amplitude less than or equal to the 3rd preset value, then will be with the Current Temperatures The 4th terminal voltage under the minimum temperature value of difference amplitude is used as the 4th terminal voltage of target.
Corresponding multiple identical terminal voltage data are distinguished from different temperature due to there may be in the second mapping relations, In the step, if being close to voltage when the immediate data more than one of front voltage, can be paid the utmost attention to, i.e., first find and work as Immediate 4th terminal voltage of front voltage value, and judge immediate these the 4th terminal voltages with when front voltage differs amplitude Whether be less than or equal to the 3rd preset value, if immediate these the 4th terminal voltages with when front voltage differ amplitude less than or Person is equal to the 3rd preset value, then the C.T data again between these the 4th terminal voltages, will differ amplitude most with Current Temperatures The 4th terminal voltage under little temperature value is used as the 4th terminal voltage of target.
It is weighted alternatively, it is also possible to voltage and temperature, voltage difference is Δ V=| V1-V1 '/V1+V1 ' |, temperature difference | T-T '/T+T ' | (V1, T are current detection data, and V1 ', T ' they are record data) for Δ T=, difference parameter X=a Δ V+b Δ T, Impact more greatly in view of voltage differences, a can be set>B, such as a=3, b=2；Or a=3, b=1 etc..
Step 706, basis stable state open-circuit voltage corresponding with the 4th terminal voltage of the target acquisition battery are current Dump energy.
In the step, battery management system can be according to corresponding with the 4th terminal 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, detect battery when front voltage and Current Temperatures；Look into Look for and whether having recorded in institute in the second mapping relations of the temperature, terminal voltage and stable state open-circuit voltage of the battery of acquisition in advance That states under Current Temperatures described works as front voltage；If in second mapping relations there being described under the Current Temperatures record Work as front voltage, then work as when the corresponding stable state open-circuit voltage of front voltage obtains the battery according under the Current Temperatures Front dump energy；If the current terminal voltage has not been recorded in second mapping relations, search second mapping and close With described when front voltage differs the 4th minimum terminal voltage of amplitude in system；If with described when front voltage differs amplitude minimum The number of the 4th terminal voltage is more than one, then the 4th end under the temperature value minimum by amplitude is differed with the Current Temperatures Voltage is used as the 4th terminal voltage of target；The battery is obtained according to stable state open-circuit voltage corresponding with the 4th terminal voltage of the target Current dump energy.The embodiment of the present invention in mapping relations in the case of no corresponding terminal voltage data, by finding Existing with when the immediate terminal voltage of front voltage in mapping relations, in effectively compensate for mapping relations, data storage is limited Defect.
8th embodiment
Referring to Fig. 8, Fig. 8 is the structure chart of battery management system provided in an embodiment of the present invention, as shown in figure 8, cell tube Reason system 800 includes：
First detection module 801, works as front voltage for detect battery.
First searching modul 802, for searching the of the terminal voltage of the battery of advance acquisition and stable state open-circuit voltage Whether the current terminal voltage has been recorded in one mapping relations.
First acquisition module 803, if having a current terminal voltage for record in first mapping relations, according to The dump energy current when the front voltage corresponding stable state open-circuit voltage acquisition battery.
Optionally, as shown in figure 9, battery management system 800 also includes：
Second detection module 804, if for the battery stop output energy after and the battery output circuit break Voltage pulsation amplitude before opening is less than or equal to the first preset value, then detect the first terminal voltage of the battery.
3rd detection module 805, if for the battery time for disconnecting of output circuit more than or equal to it is default when Between, then detect the first stable state open-circuit voltage of the battery.
Memory module 806, stores for the corresponding relation by first terminal voltage and the first stable state open-circuit voltage In first mapping relations.
Optionally, as shown in Figure 10, battery management system 800 also includes：
Upper transmission module 807, for first terminal voltage and first stable state in first mapping relations is opened The corresponding relation of road voltage is uploaded in first server, and the first server is identical with the battery specifications for storing Battery terminal voltage and stable state open-circuit voltage mapping relations server.
Optionally, as shown in figure 11, battery management system 800 also includes：
Second searching modul 808, if for not recorded the current terminal voltage in first mapping relations, searching With described when front voltage differs the second minimum terminal voltage of amplitude in first mapping relations.
Second acquisition module 809, if for second terminal voltage with it is described when front voltage differ amplitude be less than 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 second terminal voltage Energy.
Optionally, as shown in figure 12, battery management system 800 also includes：
3rd searching modul 8010, if for not recorded the current terminal voltage in first mapping relations, looking into Look for whether recorded in the mapping relations with other batteries of the battery same size stored in second server with it is described When corresponding 3rd terminal voltage of front voltage.
3rd acquisition module 8011, if for store in the second server with the battery same size other In the mapping relations of battery, record has the 3rd terminal voltage, then according to stable state open-circuit voltage corresponding with the 3rd terminal voltage Obtain the current dump energy of the battery.
Optionally, the first detection module 801 be used for detect battery when front voltage and Current Temperatures；
First searching modul 802 is used for temperature, terminal voltage and the stable state open circuit of the battery for searching advance acquisition Whether record in second mapping relations of voltage described under the Current Temperatures and work as front voltage；
If first acquisition module 803 is used for record in second mapping relations the institute under the Current Temperatures State and work as front voltage, then according under the Current Temperatures when the corresponding stable state open-circuit voltage of front voltage obtains the battery Current dump energy.
Optionally, as shown in figure 13, battery management system 800 also includes：
4th searching modul 8012, if for not recorded the current terminal voltage in second mapping relations, looking into Look in second mapping relations with described when front voltage differs the 4th minimum terminal voltage of amplitude.
Selecting module 8013, if for being more than with the number of the 4th terminal voltage that amplitude minimum is differed when front voltage One, and the 4th terminal voltage is less than or equal to threeth preset value when front voltage differs amplitude with described, then will be with institute The 4th terminal voltage under the minimum temperature value of Current Temperatures difference amplitude is stated as the 4th terminal voltage of target.
4th acquisition module 8014, obtains institute for basis stable state open-circuit voltage corresponding with the 4th terminal voltage of the target State the current dump energy of battery.
Additionally, in the embodiment of the present invention, battery management system can also include the 5th acquisition module, for according to time electricity Stream voltage integration obtains the current dump energy of the battery.
Battery management system 800 can realize each mistake that battery management system is realized in the embodiment of the method for Fig. 1 to Fig. 7 Journey, to avoid repeating, is repeated no more here.
The battery management system 800 of the embodiment of the present invention, detect battery work as front voltage；Search the described of acquisition in advance Whether the current terminal voltage has been recorded in the terminal voltage of battery and the first mapping relations of stable state open-circuit voltage；If described first In mapping relations, record has the current terminal voltage, then according to described when the corresponding stable state open-circuit voltage of front voltage obtains institute State the current dump energy of battery.So, terminal voltage and stable state open-circuit voltage of the embodiment of the present invention by acquisition battery in advance Mapping relations, with realize obtain when under front voltage accurate dump energy purpose.
The invention further relates to a kind of electric automobile, including the battery management system as shown in Fig. 8 to Figure 13, to avoid weight It is multiple, repeat no more here.
The above, the only specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be defined by scope of the claims.

Claims (15)

1. a kind of battery remaining power acquisition methods, it is characterised in that include：
That detects battery works as front voltage；
Whether record in searching the terminal voltage of the battery and the first mapping relations of stable state open-circuit voltage for obtaining in advance State and work as front voltage；
If record has a current terminal 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. method according to claim 1, it is characterised in that the step of the detection battery is when front voltage it Before, methods described also includes：
If the battery stop output energy after and the battery output circuit disconnect before voltage pulsation amplitude be less than or Person is equal to the first preset value, then detect the first terminal voltage of the battery；
If the time that the output circuit of the battery disconnects is more than or equal to Preset Time, detect that the first of the battery is steady State open-circuit voltage；
The corresponding relation of first terminal voltage and the first stable state open-circuit voltage is stored in first mapping relations.
3. method according to claim 2, it is characterised in that described by first terminal voltage and first stable state After the corresponding relation of open-circuit voltage is stored in the step in first mapping relations, methods described also includes：
The corresponding relation of first terminal voltage and the first stable state open-circuit voltage in first mapping relations is uploaded Into first server, the first server is the terminal voltage and stable state for storage with the battery specifications identical battery The server of the mapping relations of open-circuit voltage.
4. the method according to any one of claims 1 to 3, it is characterised in that in the electricity searched and obtain in advance After the step of whether having recorded the current terminal voltage in the terminal voltage in pond and the first mapping relations of stable state open-circuit voltage, institute Stating method also includes：
If the current terminal voltage has not been recorded in first mapping relations, search in first mapping relations with it is described When front voltage differs the second minimum terminal voltage of amplitude；
If second terminal voltage is with described when front voltage differs amplitude less than or equal to the second preset value, basis and institute State the corresponding stable state open-circuit voltage of the second terminal voltage and obtain the current dump energy of the battery.
5. the method according to any one of claims 1 to 3, it is characterised in that in the electricity searched and obtain in advance After the step of whether having recorded the current terminal voltage in the terminal voltage in pond and the first mapping relations of stable state open-circuit voltage, institute Stating method also includes：
If the current terminal voltage has not been recorded in first mapping relations, search second server in store with it is described Whether record in the mapping relations of other batteries of battery same size with described when corresponding 3rd terminal voltage of front voltage；
If recording in the mapping relations with other batteries of the battery same size stored in the second server The 3rd terminal voltage is stated, then the current residual energy of the battery is obtained according to stable state open-circuit voltage corresponding with the 3rd terminal voltage Amount.
6. the method according to any one of claims 1 to 3, it is characterised in that the detection battery works as front voltage, bag Include：
Detection battery when front voltage and Current Temperatures；
It is described to search the advance terminal voltage of the battery for obtaining and whether record in the first mapping relations of stable state open-circuit voltage There is the current terminal voltage, including：
Whether record in second mapping relations of the temperature, terminal voltage and stable state open-circuit voltage of searching the battery for obtaining in advance Have described under the Current Temperatures and work as front voltage；
If record has a current terminal 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, including：
If record to have described under the Current Temperatures in second mapping relations working as front voltage, basis is worked as described The dump energy current when the front voltage corresponding stable state open-circuit voltage acquisition battery at front temperature.
7. method according to claim 6, it is characterised in that temperature in the battery searched and obtain in advance, After the step of whether having recorded the current terminal voltage in terminal voltage and the second mapping relations of stable state open-circuit voltage, the side Method also includes：
If the current terminal voltage has not been recorded in second mapping relations, search in second mapping relations with it is described When front voltage differs the 4th minimum terminal voltage of amplitude；
If with described when front voltage differs the number of the 4th minimum terminal voltage of amplitude more than one, and the 4th terminal voltage With described when front voltage differs amplitude less than or equal to the 3rd preset value, then amplitude will be differed with the Current Temperatures minimum Temperature value under the 4th terminal voltage as the 4th terminal voltage of target；
The current dump energy of the battery is obtained according to stable state open-circuit voltage corresponding with the 4th terminal voltage of the target.
8. a kind of battery management system, it is characterised in that include：
First detection module, works as front voltage for detect battery；
First searching modul, for searching the first mapping pass of the terminal voltage of the battery of advance acquisition and stable state open-circuit voltage Whether the current terminal voltage has been recorded in system；
First acquisition module, if having the current terminal 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, it is characterised in that also include：
Second detection module, if the electricity for the battery after output energy is stopped and before the output circuit disconnection of the battery Pressure fluctuating margin is less than or equal to the first preset value, then detect the first terminal voltage of the battery；
3rd detection module, if the time for the output circuit disconnection of the battery is more than or equal to Preset Time, examines Survey the first stable state open-circuit voltage of the battery；
Memory module, for the corresponding relation of first terminal voltage and the first stable state open-circuit voltage is stored in described In one mapping relations.
10. system according to claim 9, it is characterised in that also include：
Upper transmission module, for by first terminal voltage and the first stable state open-circuit voltage in first mapping relations Corresponding relation is uploaded in first server, and the first server is for storage and the battery specifications identical battery The server of the mapping relations of terminal voltage and stable state open-circuit voltage.
11. systems according to any one of claim 8 to 10, it is characterised in that also include：
Second searching modul, if for not recorded the current terminal voltage in first mapping relations, searching described With described when front voltage differs the second minimum terminal voltage of amplitude in one mapping relations；
Second acquisition module, if for second terminal voltage with described when front voltage differs amplitude less than or equal to second Preset value, then obtain the current dump energy of the battery according to stable state open-circuit voltage corresponding with second terminal voltage.
12. systems according to any one of claim 8 to 10, it is characterised in that also include：
3rd searching modul, if for the current terminal voltage has not been recorded in first mapping relations, searching second and taking Whether record in the mapping relations with other batteries of the battery same size stored in business device with described when front end electricity Press corresponding 3rd terminal voltage；
3rd acquisition module, if reflecting with other batteries of the battery same size for storing in the second server Penetrating record in relation has the 3rd terminal voltage, then obtain described according to stable state open-circuit voltage corresponding with the 3rd terminal voltage The current dump energy of battery.
13. systems according to any one of claim 8 to 10, it is characterised in that the first detection module is used to detect Battery when front voltage and Current Temperatures；
First searching modul is used for the of temperature, terminal voltage and the stable state open-circuit voltage of the battery for searching advance acquisition Whether record in two mapping relations described under the Current Temperatures and work as front voltage；
If first acquisition module is used for record in second mapping relations described current under the Current Temperatures Terminal voltage, then according under the Current Temperatures, when the corresponding stable state open-circuit voltage of front voltage, to obtain the battery current Dump energy.
14. systems according to claim 13, it is characterised in that also include：
4th searching modul, if for not recorded the current terminal voltage in second mapping relations, searching described With described when front voltage differs the 4th minimum terminal voltage of amplitude in two mapping relations；
Selecting module, if for being more than one with the number of the 4th terminal voltage that amplitude minimum is differed when front voltage, and 4th terminal voltage is less than or equal to threeth preset value when front voltage differs amplitude with described, then will be with the current temperature The 4th terminal voltage under the minimum temperature value of degree difference amplitude is used as the 4th terminal voltage of target；
4th acquisition module, obtains the battery for basis stable state open-circuit voltage corresponding with the 4th terminal voltage of the target and works as Front dump energy.
15. a kind of electric automobiles, it is characterised in that include the battery management system as described in any one of claim 8 to 14.
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