CN101738583B - Method and device for calculating battery pack capacity - Google Patents
Method and device for calculating battery pack capacity Download PDFInfo
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- CN101738583B CN101738583B CN 200810226841 CN200810226841A CN101738583B CN 101738583 B CN101738583 B CN 101738583B CN 200810226841 CN200810226841 CN 200810226841 CN 200810226841 A CN200810226841 A CN 200810226841A CN 101738583 B CN101738583 B CN 101738583B
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Abstract
The invention provides a method and a device for calculating the battery pack capacity, wherein the method comprises the following steps of: calculating the current capacity of each single battery when a system is electrified and initiated; calculating the current battery pack capacity and the current available capacity of a battery pack according to the current capacity of each single battery; and calculating the battery pack capacity by adopting a current integration method on the basis of the calculated current battery pack capacity and the calculated current available capacity of the battery pack after the system is electrified and initiated. In the invention, the current capacity of the battery pack is recalculated by utilizing each electrifying and initiating process of the system, and the battery pack capacity is calculated by adopting the current integration method on the basis of recalculating the capacity after the system is electrified and initiated, therefore, the accumulated error caused by the current integration method can be eliminated, and the calculation accuracy is improved.
Description
Technical field
The present invention relates to field of automobile, particularly a kind of battery capacity calculates method and apparatus.
Background technology
Along with the anxiety of the energy and increasingly sharpening of environmental pollution, make the orthodox car industry development be faced with numerous difficulties, so electric automobile and hybrid vehicle appear as vast automobile production manufacturer and the consumer has an optimistic view of, become the focus of development of automobile.Electric automobile and hybrid vehicle refer to the automobile take electric energy as power, generally adopt high-level efficiency rechargeable battery or fuel cell as power source.Because electric energy is secondary energy, it can derive from the various ways such as wind energy, water energy, nuclear energy, heat energy, sun power, so electric automobile belongs to zero-emission vehicle, can effectively solve the environmental problem that energy shortage and automobile exhaust pollution bring.
Battery technology is perplexing the development of ev industry always as the gordian technique of Development of Electric Vehicles.Power battery pack is the power resources of electric automobile and hybrid vehicle, and how effectively battery capacity to be carried out monitor and predict is an electric battery key issue in use, and the capacity of electric battery also is an important parameter of car load simultaneously.
At present, for single battery, existing battery capacity calculating method includes two kinds of current integration computing method and terminal voltage computing methods.And these two kinds of computing method have relative merits separately, although can calculate the capacity of electric battery such as the current integration computing method in the Vehicle Driving Cycle process, can constantly produce cumulative errors, finally will make result of calculation substantial deviation actual value.And because terminal voltage method is strict to battery pack current, therefore can't in the Vehicle Driving Cycle process, use the method, but the method can not produce cumulative errors, and the battery capacity of calculating is comparatively accurate.
In addition, above-mentioned battery capacity calculating method is applicable to the calculating of single battery capacity, because the problem of consistency of battery pack, above-mentioned computing method are for the calculating of battery capacity and not exclusively applicable.Consistency of battery pack mainly refers to the diversity factor of the current capacity of each single battery in the electric battery.Because electric battery is in series by single battery, battery capacity is that the single battery by current lowest capacity determines, rather than determined by the high single battery of capacity.Therefore in the identical situation of single battery capacity, consistency of battery pack is poorer, and battery capacity is lower.After use after a while, owing to reasons such as self discharge and capacity attenuations, the current capacity volume variance of each batteries will become greatly the electric battery that consistance arrives very much again, and namely the consistance of electric battery reduces, and causes battery capacity to reduce.
In sum, need a kind of scheme of calculating battery capacity in the prior art badly and not only can solve the defective that existing single battery calculation of capacity method is brought, need also to consider that consistency of battery pack changes the impact that battery capacity is caused.
Summary of the invention
Purpose of the present invention is intended to solve at least one of above-mentioned technological deficiency, and the calculation of capacity method that can solve existing single battery can't be applicable to the problem that battery capacity calculates.
For achieving the above object, one aspect of the present invention proposes a kind of battery capacity calculating method, may further comprise the steps: when system's power-up initializing, calculate the current capacity of each single battery; The current capacity of electric battery and the current active volume of electric battery according to the current calculation of capacity electric battery of each single battery; After system's power-up initializing is finished, adopt the current integration method to carry out the calculating of battery capacity on the current capacity of electric battery and the current active volume of the electric battery basis of the described electric battery of calculating.
As one embodiment of the present of invention, the current capacity of described each single battery of calculating may further comprise the steps: the terminal voltage of measuring each single battery in the described electric battery; According to the current capacity that terminal voltage and the default question blank of each single battery of measuring are determined each single battery, described default question blank is set up according to the model of battery.
In the above-described embodiments, the current capacity of electric battery and the current active volume of electric battery according to the current calculation of capacity electric battery of each single battery may further comprise the steps: the current capacity to each single battery of calculating sorts, and determines the highest current single battery capability value and current minimum single battery capability value; Calculate the current capacity of described electric battery and the current active volume of electric battery according to described the highest current single battery capability value and current minimum single battery capability value.
As one embodiment of the present of invention, according to described the highest current single battery capability value with current minimum single battery capability value calculates the current capacity of described electric battery and the current active volume of electric battery specifically comprises: the current capacity of described electric battery=single battery capacity-(the highest current single battery capability value-current minimum single battery capability value), the current active volume of described electric battery are described current minimum single battery capability value.
As one embodiment of the present of invention, each single battery in the described electric battery is connected in series.
The present invention also proposes on the other hand a kind of battery capacity and calculates device, comprise that initialization computing module and battery capacity calculate module, described initialization computing module, be used for when system's power-up initializing, calculating the current capacity of each single battery, and according to the current capacity of electric battery and the current active volume of electric battery of the current calculation of capacity electric battery of each single battery; Described battery capacity calculates module, is used for after system's power-up initializing is finished, and adopts the current integration method to carry out the calculating of battery capacity on the current capacity of described electric battery and the current active volume of electric battery basis that described initialization computing module calculates.
As one embodiment of the present of invention, described initialization computing module comprises that voltage measurement submodule, question blank are preserved submodule and current capacity is inquired about submodule, and described voltage measurement submodule is for the terminal voltage of measuring each single battery in the described electric battery; Described question blank is preserved submodule, is used for preserving the question blank according to single battery terminal voltage with the corresponding battery capacity of battery size foundation; Described current capacity inquiry submodule is inquired about described question blank for the terminal voltage of each single battery of measuring according to described voltage measurement submodule and is preserved the question blank of preserving in the submodule, determines the current capacity of each single battery.
In the above-described embodiments, described initialization computing module also comprises ordering submodule and calculating sub module, described ordering submodule is used for the current capacity of each single battery of calculating is sorted, and determines the highest current single battery capability value and current minimum single battery capability value; Described calculating sub module is used for calculating the current capacity of described electric battery and the current active volume of electric battery according to current the highest single battery capability value and current minimum single battery capability value that described ordering submodule is determined.
As one embodiment of the present of invention, the current capacity of described electric battery=single battery capacity-(the highest current single battery capability value-current minimum single battery capability value), the current active volume of described electric battery are described current minimum single battery capability value.
As one embodiment of the present of invention, each single battery in the described electric battery is connected in series.
The process that the present invention utilizes every subsystem power-up initializing recomputates the current capacity of electric battery, on the basis of the capacity that is recomputating behind system's power-up initializing, adopt again the current integration method to carry out the calculating of battery capacity, thereby can eliminate the cumulative errors that the current integration method causes, improve the accuracy of calculating.In addition when system's power-up initializing calculates the current capacity of electric battery, consider that consistency of battery pack is on the impact of battery capacity, thereby further improve the computational accuracy of battery capacity, thereby avoid after the long-term use of electric battery, because consistency of battery pack changes battery capacity is calculated the impact that causes, for car load provides more reliable battery capacity result.
The aspect that the present invention adds and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Above-mentioned and/or the additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:
Fig. 1 is the process flow diagram of the battery capacity calculating method of the embodiment of the invention;
Fig. 2 is the structural drawing that the battery capacity of the embodiment of the invention calculates device.
Embodiment
The below describes embodiments of the invention in detail, and the example of described embodiment is shown in the drawings, and wherein identical or similar label represents identical or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, only be used for explaining the present invention, and can not be interpreted as limitation of the present invention.
The present invention mainly is, the process of utilizing every subsystem power-up initializing recomputates the current capacity of electric battery, on the basis of the capacity that is recomputating behind system's power-up initializing, adopt again the current integration method to carry out the calculating of battery capacity, thereby can eliminate the cumulative errors that the current integration method causes, improve the accuracy of calculating.As one embodiment of the invention, the present invention also considers consistency of battery pack to the impact of battery capacity, thereby further improves the computational accuracy of battery capacity when calculating the current capacity of electric battery.
As shown in Figure 1, be the process flow diagram of the battery capacity calculating method of the embodiment of the invention, each single battery in the electric battery is connected in series in this embodiment, and this embodiment may further comprise the steps:
Step S101 sets up the question blank of single battery terminal voltage and corresponding battery capacity according to the battery specific model.Wherein this question blank can be provided by battery producer, also can measure the battery of this model, sets up the question blank of single battery terminal voltage and corresponding battery capacity.Need to prove, all need when this question blank is not each system initialization to set up, get final product but once establish system's power-up initializing use.
Step S102 when system's power-up initializing, calculates the current capacity of each single battery.In one embodiment of the invention, when power-up initializing, adopt the terminal voltage method to calculate the current capacity of each single battery.More specifically, measure the terminal voltage of each single battery in the electric battery, determine the current capacity of each single battery according to the question blank of setting up in advance among the terminal voltage of each single battery of measuring and the step S101.
Step S103 is according to the current capacity of electric battery and the current active volume of electric battery of the current calculation of capacity electric battery of each single battery.Because during every subsystem power-up initializing, changing may appear in the consistance of electric battery, therefore also needs to consider the problem of consistency of battery pack in this step.In one embodiment of the invention, particularly, at first the current capacity of each single battery of calculating sorted, determine the highest current single battery capability value and current minimum single battery capability value, calculate the current capacity of electric battery and the current active volume of electric battery according to the highest current single battery capability value and current minimum single battery capability value more afterwards.More specifically, wherein,
The current capacity of electric battery=single battery capacity-(the highest current single battery capability value-current minimum single battery capability value),
The current active volume of electric battery=current minimum single battery capability value.
Wherein, the current capacity of above-mentioned electric battery is that current electric battery is after use after a while, at the actual capacity of considering this electric battery on the basis of consistency of battery pack.The current active volume of electric battery is the actual available capacity of this electric battery behind the consideration consistency of battery pack.The electric battery that for example arrives very much for the consistance of just having dispatched from the factory, its battery capacity is 50AH, but through use after a while, because the impact of consistency of battery pack, the current capacity of electric battery has become 40AH, even that is to say because the current electric battery of impact of consistency of battery pack is full of the capacity that electricity also only has 40AH.The current active volume of same hypothesis electric battery is 20AH, that is to say that the capacity of current electric battery spends half of it.
Step S104, after system's power-up initializing is finished, vehicle enters transport condition, and electric battery discharges and recharges, and adopt current integration method to carry out the calculating of battery capacity at the current capacity of the above-mentioned electric battery that calculates and the current active volume of electric battery basis this moment.Although the current integration method is used the calculating with the single battery pool-size, but because the interior single battery of electric battery all is connected in series in this embodiment, therefore the electric current of single battery is the electric current of electric battery, on the known basis of the current capacity of electric battery and the current active volume of electric battery, just can calculate by the current integration method variation of electric current like this, thereby realize the calculating to battery capacity.Because the current integration method is habitually practised by those skilled in the art, the current integration method that adopts of its principle and implementation method and this step is substantially similar, the current capacity of electric battery and the current active volume of electric battery upgraded when the basis of in this embodiment current integration method that different is is system's power-up initializing.
As shown in Figure 2, for the battery capacity of the embodiment of the invention calculates the structural drawing of device, wherein each single battery in the electric battery is connected in series.This battery capacity calculates device 100 and comprises that initialization computing module 110 and battery capacity calculate module 120.Initialization computing module 110 is used for calculating the current capacity of each single battery when system's power-up initializing, and according to the current capacity of electric battery and the current active volume of electric battery of the current calculation of capacity electric battery of each single battery.Battery capacity calculates module 120 and is used for after system's power-up initializing is finished, vehicle enters transport condition, when electric battery discharges and recharges, adopt the current integration method to carry out the calculating of battery capacity on the current capacity of electric battery and the current active volume of electric battery basis that initialization computing module 110 calculates.
As one embodiment of the present of invention, initialization computing module 110 comprises that voltage measurement submodule 111, question blank are preserved submodule 112 and current capacity is inquired about submodule 113.Voltage measurement submodule 111 is used for measuring the terminal voltage of each single battery in the electric battery.Question blank is preserved submodule 112 and is used for preservation according to the question blank of single battery terminal voltage with the corresponding battery capacity of battery size foundation.Current capacity inquiry submodule 113 is used for preserving the question blank of submodule 112 interior preservations according to the terminal voltage inquiry question blank of each single battery of voltage measurement submodule 111 measurements, determines the current capacity of each single battery.
In the above-described embodiments, initialization computing module 110 also comprises ordering submodule 114 and calculating sub module 115.Ordering submodule 114 is used for the current capacity of each single battery that calculates is sorted, and determines the highest current single battery capability value and current minimum single battery capability value.Current the highest single battery capability value and current minimum single battery capability value that calculating sub module 115 is used for determining according to ordering submodule 114 calculate the current capacity of electric battery and the current active volume of electric battery.Wherein, the current capacity of electric battery=single battery capacity-(the highest current single battery capability value-current minimum single battery capability value), the current active volume of electric battery=current minimum single battery capability value.
The process that the present invention utilizes every subsystem power-up initializing recomputates the current capacity of electric battery, on the basis of the capacity that is recomputating behind system's power-up initializing, adopt again the current integration method to carry out the calculating of battery capacity, thereby can eliminate the cumulative errors that the current integration method causes, improve the accuracy of calculating.In addition when system's power-up initializing calculates the current capacity of electric battery, consider that consistency of battery pack is on the impact of battery capacity, thereby further improve the computational accuracy of battery capacity, thereby avoid after the long-term use of electric battery, because consistency of battery pack changes battery capacity is calculated the impact that causes, for car load provides more reliable battery capacity result.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification to these embodiment that scope of the present invention is by claims and be equal to and limit.
Claims (6)
1. a battery capacity calculating method is characterized in that, may further comprise the steps:
When system's power-up initializing, calculate the current capacity of each single battery;
The current capacity of electric battery and the current active volume of electric battery according to the current calculation of capacity electric battery of each single battery: the current capacity to each single battery of calculating sorts, and determines the highest current single battery capability value and current minimum single battery capability value;
Calculate the current capacity of described electric battery and the current active volume of electric battery according to described the highest current single battery capability value and current minimum single battery capability value, specifically comprise: the current capacity of described electric battery=single battery capacity-(the highest current single battery capability value-current minimum single battery capability value), the current active volume of described electric battery are described current minimum single battery capability value; After system's power-up initializing is finished, adopt the current integration method to carry out the calculating of battery capacity on the current capacity of electric battery and the current active volume of the electric battery basis of the described electric battery of calculating.
2. battery capacity calculating method as claimed in claim 1 is characterized in that, the current capacity of described each single battery of calculating may further comprise the steps:
Measure the terminal voltage of each single battery in the described electric battery;
According to the current capacity that terminal voltage and the default question blank of each single battery of measuring are determined each single battery, described default question blank is set up according to the model of battery.
3. battery capacity calculating method as claimed in claim 1 is characterized in that, each single battery in the described electric battery is connected in series.
4. a battery capacity calculates device, it is characterized in that, comprises that initialization computing module and battery capacity calculate module,
Described initialization computing module is used for calculating the current capacity of each single battery when system's power-up initializing, and according to the current capacity of electric battery and the current active volume of electric battery of the current calculation of capacity electric battery of each single battery; Described initialization computing module comprises ordering submodule and calculating sub module,
Described ordering submodule is used for the current capacity of each single battery of calculating is sorted, and determines the highest current single battery capability value and current minimum single battery capability value;
Described calculating sub module is used for calculating the current capacity of described electric battery and the current active volume of electric battery according to current the highest single battery capability value and current minimum single battery capability value that described ordering submodule is determined;
The current capacity of described electric battery=single battery capacity-(the highest current single battery capability value-current minimum single battery capability value), the current active volume of described electric battery are described current minimum single battery capability value;
Described battery capacity calculates module, is used for after system's power-up initializing is finished, and adopts the current integration method to carry out the calculating of battery capacity on the current capacity of described electric battery and the current active volume of electric battery basis that described initialization computing module calculates.
5. battery capacity as claimed in claim 4 calculates device, it is characterized in that, described initialization computing module comprises that also voltage measurement submodule, question blank are preserved submodule and current capacity is inquired about submodule,
Described voltage measurement submodule is for the terminal voltage of measuring each single battery in the described electric battery;
Described question blank is preserved submodule, is used for preserving the question blank according to single battery terminal voltage with the corresponding battery capacity of battery size foundation;
Described current capacity inquiry submodule is inquired about described question blank for the terminal voltage of each single battery of measuring according to described voltage measurement submodule and is preserved the question blank of preserving in the submodule, determines the current capacity of each single battery.
6. battery capacity as claimed in claim 5 calculates device, it is characterized in that, each single battery in the described electric battery is connected in series.
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| CN 200810226841 CN101738583B (en) | 2008-11-18 | 2008-11-18 | Method and device for calculating battery pack capacity |
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| CN110031768B (en) * | 2019-03-26 | 2020-06-16 | 清华大学 | Method for determining available electric capacity and state of charge value of lithium ion battery |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1691461A (en) * | 2004-04-23 | 2005-11-02 | 索尼株式会社 | Method of charging secondary battery, method of calculating remaining capacity rate of secondary battery, and battery pack |
| JP2005315597A (en) * | 2004-04-27 | 2005-11-10 | Sony Corp | Remaining capacity calculation method and battery pack of secondary battery |
| CN1945345A (en) * | 2005-10-09 | 2007-04-11 | 奇瑞汽车有限公司 | Detecting device and method for mixed power automobile battery remainder |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1691461A (en) * | 2004-04-23 | 2005-11-02 | 索尼株式会社 | Method of charging secondary battery, method of calculating remaining capacity rate of secondary battery, and battery pack |
| JP2005315597A (en) * | 2004-04-27 | 2005-11-10 | Sony Corp | Remaining capacity calculation method and battery pack of secondary battery |
| CN1945345A (en) * | 2005-10-09 | 2007-04-11 | 奇瑞汽车有限公司 | Detecting device and method for mixed power automobile battery remainder |
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