CN104931882A - Power battery capacity correction method and apparatus - Google Patents
Power battery capacity correction method and apparatus Download PDFInfo
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Abstract
The invention discloses a power battery capacity correction method and an apparatus. The power battery capacity correction method comprises the following steps of acquiring a working state of a power battery; acquiring a first inflection point, a second inflection point and a corresponding first charged state and a second charged state on a capacity change curve of the power battery; during a discharging state, acquiring an actual discharging electric quantity of the power battery from a full charged state down to the first charged state; during a charging state, acquiring a first actual charging electric quantity of the power battery from the second charged state up to the full charged state; according to the first charged state, the actual discharging electric quantity and the first actual charging electric quantity, acquiring a first total capacity and a second total capacity of the power battery in the full charged state; according to the first total capacity and the second total capacity, correcting an initial nominal capacity of the power battery. By using the power battery capacity correction method and the apparatus of the invention, actual capacities of a single power battery and a power battery pack can be accurately acquired; a parameter does not need to be reset and realization is simple.
Description
Technical field
The present invention relates to vehicle technology field, particularly a kind of method of electrokinetic cell cubage correction and a kind of device of electrokinetic cell cubage correction.
Background technology
In correlation technique, propose a kind of method that power battery of electric vehicle actual capacity is estimated, the method is based on battery mathematical model, first System Discrimination algorithm is utilized to come open-circuit voltage and the capacity of identification battery, after the open-circuit voltage recognizing battery and capacity, the open-circuit voltage of note battery is OCV1 and OCV2, and remember that open-circuit voltage be the battery capacity that OCV1 and OCV2 is corresponding is Cap1 and Cap2, use AH (Ampere Hour simultaneously, ampere-hour) integral algorithm estimates battery capacity Cap3, then to Cap1, Cap2 and Cap3 is weighted with filtering method process to obtain battery capacity Cap0, finally the battery actual capacity that filtering process obtains meeting through engineering approaches application requirement is carried out to Cap0.
Although the actual capacity measuring and calculating of the method estimated battery actual capacity in above-mentioned correlation technique to cell is more accurate, but after cell is connected into electric battery, because electric motor car is in operational process, certain change is there is in total voltage when anxious acceleration or anxious deceleration, and the monomer consistance missionary society of each cell causes power battery pack actual capacity more unilateral, thus, the total voltage of electric battery intuitively can not reflect battery pack actual capacity.Therefore, need to improve correlation technique.
Summary of the invention
Object of the present invention is intended to solve one of above-mentioned technical matters at least to a certain extent.
For this reason, one object of the present invention is a kind of method proposing electrokinetic cell cubage correction, the method of this electrokinetic cell cubage correction, by revising electrokinetic cell capacity, not only can obtain single power battery actual capacity, can also obtain power battery pack actual capacity.
Another object of the present invention is the device proposing a kind of electrokinetic cell cubage correction.
For achieving the above object, one aspect of the present invention embodiment proposes a kind of method of electrokinetic cell cubage correction, and the method for this electrokinetic cell cubage correction comprises the following steps: the duty obtaining electrokinetic cell; Obtain the first flex point on the volume change curve of described electrokinetic cell and Second Inflexion Point, and the first state-of-charge obtained corresponding to described first flex point and the second state-of-charge corresponding to described Second Inflexion Point; When described electrokinetic cell work is discharge condition, obtain described electrokinetic cell drops to described first state-of-charge actual discharge electricity from fullcharging electricity condition, and when described electrokinetic cell work is charged state, obtain described electrokinetic cell rises to fullcharging electricity condition the first actual charge capacity from described second state-of-charge; Obtain the first total volume corresponding when described electrokinetic cell is fullcharging electricity condition according to described first state-of-charge and described actual discharge electricity, and obtain the second total volume corresponding when described electrokinetic cell is fullcharging electricity condition according to described first actual charge capacity and the second actual charge capacity; Revise according to the initial nominal capacity of described first total volume to electrokinetic cell described during discharge condition, and revise according to the initial nominal capacity of described second total volume to electrokinetic cell described during charged state.
The method of the electrokinetic cell cubage correction that the embodiment of the present invention proposes is in the duty obtaining electrokinetic cell, after first state-of-charge and the second state-of-charge, when electrokinetic cell work is discharge condition, obtain actual discharge electricity, and when electrokinetic cell work is charged state, obtain the first actual charge capacity, thus obtain the first total volume according to the first state-of-charge and actual discharge electricity and obtain the second total volume according to the first actual charge capacity, and then complete the correction of the initial nominal capacity of electrokinetic cell during discharge condition and the correction completing the initial nominal capacity to electrokinetic cell during charged state according to the second total volume according to the first total volume.The method of this electrokinetic cell cubage correction, by revising electrokinetic cell initial nominal capacity, not only can obtain single power battery actual capacity, can also obtain power battery pack actual capacity.
For achieving the above object, the present invention on the other hand embodiment also proposed a kind of device of electrokinetic cell cubage correction, and the device of this electrokinetic cell cubage correction comprises: duty acquisition module, for obtaining the duty of electrokinetic cell; Flex point and state-of-charge acquisition module, the first flex point and Second Inflexion Point on the volume change curve obtaining described electrokinetic cell, and the first state-of-charge obtained corresponding to described first flex point and the second state-of-charge corresponding to described Second Inflexion Point; Electricity acquisition module, for when described electrokinetic cell work is discharge condition, obtain described electrokinetic cell drops to described first state-of-charge actual discharge electricity from fullcharging electricity condition, and when described electrokinetic cell work is charged state, obtain described electrokinetic cell rises to fullcharging electricity condition the first actual charge capacity from described second state-of-charge; Total volume acquisition module, for obtaining the first total volume corresponding when described electrokinetic cell is fullcharging electricity condition according to described first state-of-charge and described actual discharge electricity, and obtain the second total volume corresponding when described electrokinetic cell is fullcharging electricity condition according to described first actual charge capacity and the second actual charge capacity; Initial nominal cubage correction module, for revising according to the initial nominal capacity of described first total volume to electrokinetic cell described during discharge condition, and revises according to the initial nominal capacity of described second total volume to electrokinetic cell described during charged state.
The device busy state acquisition module of the electrokinetic cell cubage correction that the embodiment of the present invention proposes gets the duty of electrokinetic cell, after flex point and state-of-charge acquisition module get the first state-of-charge and the second state-of-charge, when electrokinetic cell work is discharge condition, electricity acquisition module obtains actual discharge electricity, and when electrokinetic cell work is charged state, electricity acquisition module obtains the first actual charge capacity, thus total volume acquisition module obtains the first total volume according to the first state-of-charge and actual discharge electricity and obtains the second total volume according to the first actual charge capacity, and then initial nominal cubage correction module completes the correction of the initial nominal capacity of electrokinetic cell during discharge condition and the correction completing the initial nominal capacity to electrokinetic cell during charged state according to the second total volume according to the first total volume.The device of this electrokinetic cell cubage correction, by revising electrokinetic cell initial nominal capacity, not only can obtain single power battery actual capacity, can also obtain power battery pack actual capacity.
The aspect that the present invention adds and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
The present invention above-mentioned and/or additional aspect and advantage will become obvious and easy understand from the following description of the accompanying drawings of embodiments, wherein:
Fig. 1 is the process flow diagram of the method for electrokinetic cell cubage correction according to the embodiment of the present invention;
Fig. 2 is the curve synoptic diagram of single power battery actual capacity change under different charging and discharging speed;
Fig. 3 is the structured flowchart of the device of electrokinetic cell cubage correction according to the embodiment of the present invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
Disclosing hereafter provides many different embodiments or example is used for realizing different structure of the present invention.Of the present invention open in order to simplify, hereinafter the parts of specific examples and setting are described.Certainly, they are only example, and object does not lie in restriction the present invention.In addition, the present invention can in different example repeat reference numerals and/or letter.This repetition is to simplify and clearly object, itself does not indicate the relation between discussed various embodiment and/or setting.In addition, the various specific technique that the invention provides and the example of material, but those of ordinary skill in the art can recognize the property of can be applicable to of other techniques and/or the use of other materials.In addition, fisrt feature described below second feature it " on " structure can comprise the embodiment that the first and second features are formed as directly contact, also can comprise other feature and be formed in embodiment between the first and second features, such first and second features may not be direct contacts.
In describing the invention, it should be noted that, unless otherwise prescribed and limit, term " installation ", " being connected ", " connection " should be interpreted broadly, such as, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be directly be connected, also indirectly can be connected by intermediary, for the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.
The method of electrokinetic cell cubage correction and the device of electrokinetic cell cubage correction that propose according to the embodiment of the present invention are described with reference to the accompanying drawings.
As shown in Figure 1, the method for the electrokinetic cell cubage correction of the embodiment of the present invention comprises the following steps:
S1, obtains the duty of electrokinetic cell.
S2, obtains the first flex point on the volume change curve of electrokinetic cell and Second Inflexion Point, and the first state-of-charge obtained corresponding to the first flex point and the second state-of-charge corresponding to Second Inflexion Point.
Particularly, Fig. 2 is the curve synoptic diagram of single power battery actual capacity change under different charging and discharging speed.Wherein, curve 1 is the curve of single power battery actual capacity change under charging and discharging speed is 0.2C, curve 2 is the curve of single power battery actual capacity change under charging and discharging speed is 0.5C, curve 3 is the curve of single power battery actual capacity change under charging and discharging speed is 1C, curve 4 is the curve of single power battery actual capacity change under charging and discharging speed is 2C, curve 5 is the curve of single power battery actual capacity change under charging and discharging speed is 2.5C, wherein, C is initial nominal capacity.As can be seen from Figure 2, a discharge platform is there is in single power battery in the charging and discharging process of reality, and the monomer voltage of single power battery is in a stationary value in A point and B point range, that is, first flex point of the monomer voltage that A point and B point are single power battery on whole volume change curve and Second Inflexion Point, now, the first state-of-charge corresponding to the first flex point A is K1, and the second state-of-charge corresponding to Second Inflexion Point B is K2.It should be noted that, the electrokinetic cell of the embodiment of the present invention can be single power battery, also can be power battery pack.Further, in one embodiment of the invention, electrokinetic cell can be the batteries such as ferric phosphate lithium cell.When electrokinetic cell is ferric phosphate lithium cell, single power battery actual capacity change curve under different charging and discharging speed such as 0.2C, 0.5C, 1C, 2C and 2.5C of same type is basically identical, and namely it doesn't matter for the size of the first state-of-charge K1 and the second state-of-charge K2 and electrokinetic cell and capacity.
S3, when electrokinetic cell work is discharge condition, obtain electrokinetic cell drops to the first state-of-charge actual discharge electricity from fullcharging electricity condition, and when electrokinetic cell work is charged state, obtain electrokinetic cell rises to fullcharging electricity condition the first actual charge capacity from the second state-of-charge.
Further, in one embodiment of the invention, the method for electrokinetic cell cubage correction also comprises:
S6, when electrokinetic cell work is charged state, the state-of-charge obtaining electrokinetic cell rises to the second actual charge capacity of the second state-of-charge from zero state-of-charge.
Further, in one embodiment of the invention, actual discharge electricity, the first actual charge capacity and the second actual charge capacity can be obtained based on the integration of AH integral algorithm and Current versus time.Particularly, in one embodiment of the invention, when electrokinetic cell is discharged to the process of the first flex point A from fullcharging electricity condition, can electric discharge electric current be passed through, and then carry out discharge current based on AH integral algorithm actual discharge electricity is obtained to time integral.In addition, in one embodiment of the invention, when electrokinetic cell charges to the process of fullcharging electricity condition from zero state-of-charge, by test charging current, and then charging current can be carried out based on AH integral algorithm the first actual charge capacity and the second actual charge capacity obtained to time integral.
S4, the first total volume corresponding when being fullcharging electricity condition according to the first state-of-charge and actual discharge electricity acquisition electrokinetic cell, and the second total volume corresponding when being fullcharging electricity condition according to the first actual charge capacity and the second actual charge capacity acquisition electrokinetic cell.
Particularly, in one embodiment of the invention, the first total volume can be:
Wherein, S1 is described first state-of-charge, and C1 is described actual discharge electricity, and the unit of C1 is Ah.
In addition, in one embodiment of the invention, the second total volume can be:
C5=C4+C2，
Wherein, C2 is described first actual charge capacity, and C4 is described second actual charge capacity, and the unit of C2 and C4 is Ah.It should be noted that, the discharge platform scope that electrokinetic cell capacity attenuation is mainly manifested between the second state-of-charge K2 and fullcharging electricity condition diminishes, and discharge platform scope between the first flex point A and Second Inflexion Point B is constant, and discharge platform scope between zero state-of-charge to the first state-of-charge K1 is also substantially constant, that is, the second actual charge capacity C4 is substantially constant.
S5, revises according to the initial nominal capacity of the first total volume to electrokinetic cell during discharge condition, and revises according to the initial nominal capacity of the second total volume to electrokinetic cell during charged state.
It should be noted that, initial nominal capacity is the electrokinetic cell capacity of record in BMS (Battery Management System, battery management system).Further, in one embodiment of the invention, can trigger after the Preset Time of interval the initial nominal capacity of electrokinetic cell is revised.Particularly, in one embodiment of the invention, Preset Time can be N number of charging and/or N number of discharge cycle, N be more than or equal to 0 integer.
The method of the electrokinetic cell cubage correction that the embodiment of the present invention proposes is in the duty obtaining electrokinetic cell, after first state-of-charge and the second state-of-charge, when electrokinetic cell work is discharge condition, obtain actual discharge electricity, and when electrokinetic cell work is charged state, obtain the first actual charge capacity, thus obtain the first total volume according to the first state-of-charge and actual discharge electricity and obtain the second total volume according to the first actual charge capacity, and then complete the correction of the initial nominal capacity of electrokinetic cell during discharge condition and the correction completing the initial nominal capacity to electrokinetic cell during charged state according to the second total volume according to the first total volume.The method of this electrokinetic cell cubage correction is by revising electrokinetic cell initial nominal capacity, not only can obtain the actual capacity of single power battery, the actual capacity of power battery pack can also be obtained, without the need to reseting parameter, realize simple, and accuracy is high.
The present invention on the other hand embodiment also proposed a kind of device of electrokinetic cell cubage correction, as shown in Figure 3, the device of this electrokinetic cell cubage correction comprises: duty acquisition module 10, flex point and state-of-charge acquisition module 20, electricity acquisition module 30, total volume acquisition module 40 and initial nominal cubage correction module 50.Wherein, duty acquisition module 10 is for obtaining the duty of electrokinetic cell.Flex point and state-of-charge acquisition module 20 the first flex point and Second Inflexion Point on the volume change curve obtaining electrokinetic cell, and the first state-of-charge obtained corresponding to the first flex point and the second state-of-charge corresponding to Second Inflexion Point.Electricity acquisition module 30 is for when electrokinetic cell work is discharge condition, obtain electrokinetic cell drops to the first state-of-charge actual discharge electricity from fullcharging electricity condition, and when electrokinetic cell work is charged state, obtain electrokinetic cell rises to fullcharging electricity condition the first actual charge capacity from the second state-of-charge.The first total volume corresponding when total volume acquisition module 40 is fullcharging electricity condition for obtaining electrokinetic cell according to the first state-of-charge and actual discharge electricity, and the second total volume corresponding when being fullcharging electricity condition according to the first actual charge capacity and the second actual charge capacity acquisition electrokinetic cell.Initial nominal cubage correction module 50 for revising according to the initial nominal capacity of the first total volume to electrokinetic cell during discharge condition, and is revised according to the initial nominal capacity of the second total volume to electrokinetic cell during charged state.
Particularly, a discharge platform is there is in single power battery in the charging and discharging process of reality, and the monomer voltage of single power battery is in a stationary value in A point and B point range, that is, first flex point of the monomer voltage that A point and B point are single power battery on whole volume change curve and Second Inflexion Point, now, the first state-of-charge corresponding to the first flex point A is K1, and the second state-of-charge corresponding to Second Inflexion Point B is K2.It should be noted that, the electrokinetic cell of the embodiment of the present invention can be single power battery, also can be power battery pack.Further, in one embodiment of the invention, electrokinetic cell can be the batteries such as ferric phosphate lithium cell.When electrokinetic cell is ferric phosphate lithium cell, single power battery actual capacity change curve under different charging and discharging speed of same type is basically identical, and namely it doesn't matter for the size of the first state-of-charge K1 and the second state-of-charge K2 and electrokinetic cell and capacity.
Further, in one embodiment of the invention, electricity acquisition module 30 also for: when electrokinetic cell work is charged state, obtain the state-of-charge of electrokinetic cell rises to the second state-of-charge the second actual charge capacity from zero state-of-charge.It should be noted that, in one embodiment of the invention, electricity acquisition module 30 can obtain actual discharge electricity, the first actual charge capacity and the second actual charge capacity based on AH integral algorithm.Particularly, in one embodiment of the invention, when electrokinetic cell is discharged to the process of the first flex point A from fullcharging electricity condition, electricity acquisition module 30 can pass through electric discharge electric current, and then carries out discharge current based on AH integral algorithm and obtain actual discharge electricity to time integral.In addition, in one embodiment of the invention, when electrokinetic cell charges to the process of fullcharging electricity condition from zero state-of-charge, electricity acquisition module 30 by test charging current, and then can carry out charging current based on AH integral algorithm and obtains the first actual charge capacity and the second actual charge capacity to time integral.
Particularly, in one embodiment of the invention, the first total volume is:
Wherein, S1 is described first state-of-charge, and C1 is described actual discharge electricity, and the unit of C1 is Ah.
In addition, in one embodiment of the invention, the second total volume is:
C5=C4+C2，
Wherein, C2 is described first actual charge capacity, and C4 is described second actual charge capacity, and the unit of C2 and C4 is Ah.It should be noted that, the discharge platform scope that electrokinetic cell capacity attenuation is mainly manifested between the second state-of-charge K2 and fullcharging electricity condition diminishes, and discharge platform scope between the first flex point A and Second Inflexion Point B is constant, and discharge platform scope between zero state-of-charge to the first state-of-charge K1 is also substantially constant, that is, the second actual charge capacity C4 is substantially constant.
Further, in one embodiment of the invention, the device of electrokinetic cell cubage correction also comprises trigger module 60, and trigger module 60 is revised the initial nominal capacity of electrokinetic cell for triggering after the Preset Time of interval.Particularly, in one embodiment of the invention, Preset Time can be N number of charging and/or N number of discharge cycle, N be more than or equal to 0 integer.
The device busy state acquisition module of the electrokinetic cell cubage correction that the embodiment of the present invention proposes gets the duty of electrokinetic cell, after flex point and state-of-charge acquisition module get the first state-of-charge and the second state-of-charge, when electrokinetic cell work is discharge condition, electricity acquisition module obtains actual discharge electricity, and when electrokinetic cell work is charged state, electricity acquisition module obtains the first actual charge capacity, thus total volume acquisition module obtains the first total volume according to the first state-of-charge and actual discharge electricity and obtains the second total volume according to the first actual charge capacity, and then initial nominal cubage correction module completes the correction of the initial nominal capacity of electrokinetic cell during discharge condition and the correction completing the initial nominal capacity to electrokinetic cell during charged state according to the second total volume according to the first total volume.The device of this electrokinetic cell cubage correction is by revising electrokinetic cell initial nominal capacity, not only can obtain the actual capacity of single power battery, the actual capacity of power battery pack can also be obtained, without the need to reseting parameter, realize simple, and accuracy is high.
Describe and can be understood in process flow diagram or in this any process otherwise described or method, represent and comprise one or more for realizing the module of the code of the executable instruction of the step of specific logical function or process, fragment or part, and the scope of the preferred embodiment of the present invention comprises other realization, wherein can not according to order that is shown or that discuss, comprise according to involved function by the mode while of basic or by contrary order, carry out n-back test, this should understand by embodiments of the invention person of ordinary skill in the field.
In flow charts represent or in this logic otherwise described and/or step, such as, the sequencing list of the executable instruction for realizing logic function can be considered to, may be embodied in any computer-readable medium, for instruction execution system, device or equipment (as computer based system, comprise the system of processor or other can from instruction execution system, device or equipment instruction fetch and perform the system of instruction) use, or to use in conjunction with these instruction execution systems, device or equipment.With regard to this instructions, " computer-readable medium " can be anyly can to comprise, store, communicate, propagate or transmission procedure for instruction execution system, device or equipment or the device that uses in conjunction with these instruction execution systems, device or equipment.The example more specifically (non-exhaustive list) of computer-readable medium comprises following: the electrical connection section (electronic installation) with one or more wiring, portable computer diskette box (magnetic device), random access memory (RAM), ROM (read-only memory) (ROM), erasablely edit ROM (read-only memory) (EPROM or flash memory), fiber device, and portable optic disk ROM (read-only memory) (CDROM).In addition, computer-readable medium can be even paper or other suitable media that can print described program thereon, because can such as by carrying out optical scanning to paper or other media, then carry out editing, decipher or carry out process with other suitable methods if desired and electronically obtain described program, be then stored in computer memory.
Should be appreciated that each several part of the present invention can realize with hardware, software, firmware or their combination.In the above-described embodiment, multiple step or method can with to store in memory and the software performed by suitable instruction execution system or firmware realize.Such as, if realized with hardware, the same in another embodiment, can realize by any one in following technology well known in the art or their combination: the discrete logic with the logic gates for realizing logic function to data-signal, there is the special IC of suitable combinational logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) etc.
Those skilled in the art are appreciated that realizing all or part of step that above-described embodiment method carries is that the hardware that can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, this program perform time, step comprising embodiment of the method one or a combination set of.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing module, also can be that the independent physics of unit exists, also can be integrated in a module by two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.If described integrated module using the form of software function module realize and as independently production marketing or use time, also can be stored in a computer read/write memory medium.
The above-mentioned storage medium mentioned can be ROM (read-only memory), disk or CD etc.
In the description of this instructions, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalency thereof.
Claims (12)
1. a method for electrokinetic cell cubage correction, is characterized in that, comprises the following steps:
Obtain the duty of electrokinetic cell;
Obtain the first flex point on the volume change curve of described electrokinetic cell and Second Inflexion Point, and the first state-of-charge obtained corresponding to described first flex point and the second state-of-charge corresponding to described Second Inflexion Point;
When described electrokinetic cell work is discharge condition, obtain described electrokinetic cell drops to described first state-of-charge actual discharge electricity from fullcharging electricity condition, and when described electrokinetic cell work is charged state, obtain described electrokinetic cell rises to fullcharging electricity condition the first actual charge capacity from described second state-of-charge;
Obtain the first total volume corresponding when described electrokinetic cell is fullcharging electricity condition according to described first state-of-charge and described actual discharge electricity, and obtain the second total volume corresponding when described electrokinetic cell is fullcharging electricity condition according to described first actual charge capacity and the second actual charge capacity; And
Revise according to the initial nominal capacity of described first total volume to electrokinetic cell described during discharge condition, and revise according to the initial nominal capacity of described second total volume to electrokinetic cell described during charged state.
2. the method for claim 1, is characterized in that, described first total volume is:
Wherein, S1 is described first state-of-charge, and C1 is described actual discharge electricity.
3. the method for claim 1, is characterized in that, also comprises:
When described electrokinetic cell work is charged state, the state-of-charge obtaining described electrokinetic cell rises to the described second actual charge capacity of described second state-of-charge from zero state-of-charge.
4. method as claimed in claim 3, it is characterized in that, described second total volume is:
C5=C4+C2，
Wherein, C2 is described first actual charge capacity, and C4 is described second actual charge capacity.
5. method as claimed in claim 4, is characterized in that, obtain described actual discharge electricity, described first actual charge capacity and described second actual charge capacity based on ampere-hour AH integral algorithm.
6. the method for claim 1, is characterized in that, triggers and revise the initial nominal capacity of described electrokinetic cell after the Preset Time of interval.
7. a device for electrokinetic cell cubage correction, is characterized in that, comprising:
Duty acquisition module, for obtaining the duty of electrokinetic cell;
Flex point and state-of-charge acquisition module, the first flex point and Second Inflexion Point on the volume change curve obtaining described electrokinetic cell, and the first state-of-charge obtained corresponding to described first flex point and the second state-of-charge corresponding to described Second Inflexion Point;
Electricity acquisition module, for when described electrokinetic cell work is discharge condition, obtain described electrokinetic cell drops to described first state-of-charge actual discharge electricity from fullcharging electricity condition, and when described electrokinetic cell work is charged state, obtain described electrokinetic cell rises to fullcharging electricity condition the first actual charge capacity from described second state-of-charge;
Total volume acquisition module, for obtaining the first total volume corresponding when described electrokinetic cell is fullcharging electricity condition according to described first state-of-charge and described actual discharge electricity, and obtain the second total volume corresponding when described electrokinetic cell is fullcharging electricity condition according to described first actual charge capacity and the second actual charge capacity; And
Initial nominal cubage correction module, for revising according to the initial nominal capacity of described first total volume to electrokinetic cell described during discharge condition, and revises according to the initial nominal capacity of described second total volume to electrokinetic cell described during charged state.
8. device as claimed in claim 7, it is characterized in that, described first total volume is:
Wherein, S1 is described first state-of-charge, and C1 is described actual discharge electricity.
9. device as claimed in claim 7, is characterized in that, described electricity acquisition module also for:
When described electrokinetic cell work is charged state, the state-of-charge obtaining described electrokinetic cell rises to the described second actual charge capacity of described second state-of-charge from zero state-of-charge.
10. device as claimed in claim 9, it is characterized in that, described second total volume is:
C5=C4+C2，
Wherein, C2 is described first actual charge capacity, and C4 is described second actual charge capacity.
11. devices as claimed in claim 10, is characterized in that, described electricity acquisition module obtains described actual discharge electricity, described first actual charge capacity and described second actual charge capacity based on ampere-hour AH integral algorithm.
12. devices as claimed in claim 7, is characterized in that, also comprise:
Trigger module, described trigger module is used for triggering after the Preset Time of interval revising the initial nominal capacity of described electrokinetic cell.
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| CN108594121A (en) * | 2018-01-12 | 2018-09-28 | 北京新能源汽车股份有限公司 | Battery performance parameter acquisition methods and device |
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