CN109342959A - A kind of SOC estimation method for solving battery difference and using capacity requirement - Google Patents
A kind of SOC estimation method for solving battery difference and using capacity requirement Download PDFInfo
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- CN109342959A CN109342959A CN201811509085.0A CN201811509085A CN109342959A CN 109342959 A CN109342959 A CN 109342959A CN 201811509085 A CN201811509085 A CN 201811509085A CN 109342959 A CN109342959 A CN 109342959A
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Abstract
The invention discloses a kind of solution battery differences, and the SOC estimation method of capacity requirement to be used to determine the nominal capacity of battery core by nominal voltage window comprising steps of obtaining battery core nominal voltage window；Determine that the battery core capacity of actual use, the battery core capacity of the actual use should be less than the nominal capacity of battery core according to the voltage range that battery core actual needs uses；Actual use SOC range is determined according to the battery core capacity of actual use, that is, determines SOCreal range；SOCreal is converted into SOCuse.The present invention can quantify battery battery core bound avoided using volume percent, more effectively battery fill deeply it is deep put, extend the service life of battery.
Description
Technical field
The present invention relates to new energy resource power battery technical fields more particularly to a kind of solution battery difference to use capacity requirement
SOC evaluation method.
Background technique
It is well known that power battery often fills deep put deeply can accelerate battery core capacity attenuation, it is affected to cycle life, electricity
Tankage decaying directly influences the indexs such as new energy electric motor vehicle dynamic property and economy, this has become new energy electric motor vehicle visitor
Tell one of the main aspect of problem.
In order to solve this problem, the most common solution of industry is to compress the use upper and lower limit voltage window of battery,
Battery is avoided to fill deep put deeply by this method.For example the nominal voltage window of battery is 3.0-4.2V, corresponding SOC range
It is 0%-100%, is put deeply and bring cycle life reduction problem to evade deep fill, compress the upper limit, the lower limit window of battery
Mouthful, 3.1-4.15V is arranged in actual use window.
But because none unified standard of industry, and each vehicle enterprise makes battery using voltage window or battery
Different with the demand of volume percent, often the battery of same system and capacity gear, demarcate making for different windows repeatedly
With parameter, such as different windows capacity, SOC-OCV and pulse charge-discharge electric power matrix, which adds many exploitations and
Test funds extend data output period, increase project risk.
Patent No. 201611059473.4 discloses a kind of battery pack SOC estimation method, is applied in electric car
For estimating the SOC of battery pack；The battery pack includes several battery cells；The battery pack SOC estimation method includes as follows
Step: the voltage and total current of several single batteries are acquired in real time；The voltage of several single batteries is compared
Compared with to obtain ceiling voltage single battery and minimum voltage single battery；Judge whether the battery pack is constant-current charge shape
State；If the battery pack is constant-current charge state, the capacity and minimum voltage monomer of the ceiling voltage single battery are estimated
The capacity of battery；Estimate the SOC of the ceiling voltage single battery and SOC of minimum voltage single battery；Estimate the electricity
The SOC of Chi Bao.Although the invention can estimate battery pack SOC, for the different use capacity of battery, electricity can not be quantified
The percentage that pond bound uses.
Summary of the invention
It can quantify battery battery core bound the technical problem to be solved in the present invention is to provide one kind and use volume percent, more
Effectively battery is avoided to fill the SOC estimation method put deeply deeply.
In order to solve the above-mentioned technical problem, the invention adopts the following technical scheme: a kind of solution battery difference uses capacity
The SOC estimation method of demand, comprising the following steps:
S1 obtains battery core nominal voltage window, the nominal capacity of battery core is determined by nominal voltage window；
S2 determines the battery core capacity of actual use, the actual use according to the voltage range that battery core actual needs uses
Battery core capacity should be less than the nominal capacity of battery core；
S3 determines actual use SOC range according to the battery core capacity of actual use, that is, determines SOCreal range；
SOCreal is converted into SOCuse by S4.
Further, in step sl, the nominal of battery core is determined by charge and discharge electric cabinet according to the nominal voltage window of battery core
Capacity.
Further, in step s 2, the voltage range of the actual use is obtained by charge and discharge electric cabinet.
Further, the nominal capacity of the battery core is C0, the range of corresponding battery power is [0, C0], actual use
Capacity is C1, the range of corresponding practical electricity is [C2, C3], then there is 0 < C2<C3<C。
Further, in the step S3, if battery core is in the nominal capacity C0Under corresponding SOC be [0,100%],
The capacity C of actual use1The range of corresponding SOCreal is [SOCrealmin, SOCrealmax], then has
Further, in the step S4:
Wherein SOCreal=[SOCrealmin, SOCrealmax], SOCrealmin is under the capacity of battery core actual use
Corresponding SOC minimum value, SOCrealmax are corresponding SOC maximum value under the capacity that battery core actually uses.
SOCreal is that battery battery core actually uses the corresponding SOC of capacity, and SOCues is the SOC that battery is shown.
Beneficial effects of the present invention: the present invention provides a kind of SOC estimation method for solving battery difference and using capacity requirement,
The key that i.e. battery of same system and capacity gear need to only demarcate its nominal window uses parameter, in this way regardless of customer demand
The capacity that voltage window is how many or demand uses is how many, can correspond to all the way nominal window (nominal appearance by increasing
Amount) SOC estimation method so that customer demand uses section using what voltage window (use capacity) was mapped to road SOC
On (window).Can quantify bound so more effectively avoids deep fill from putting deeply using volume percent, and demarcates under nominal window
Critical battery can directly be applied based on road SOC using parameter, time saving, laborsaving, cost-saving.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the flow chart of the embodiment of the present invention；
Fig. 2 is SOCues and SOCreal corresponding relationship of the embodiment of the present invention；
Fig. 3 is battery core of embodiment of the present invention voltage and capacity curve figure.
Specific embodiment
With reference to the attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art without creative labor it is obtained it is all its
His embodiment, shall fall within the protection scope of the present invention.
As shown in Figure 1, the present invention provides the SOC estimation methods that a kind of solution battery difference uses capacity requirement, including
Following steps:
S1 obtains battery core nominal voltage window, the nominal capacity of battery core is determined by nominal voltage window；
S2 determines the battery core capacity of actual use, the actual use according to the voltage range that battery core actual needs uses
Battery core capacity should be less than the nominal capacity of battery core；
S3 determines actual use SOC range according to the battery core capacity of actual use, that is, determines SOCreal range；
SOCreal is converted into SOCuse by S4.
Further, in step sl, the nominal of battery core is determined by charge and discharge electric cabinet according to the nominal voltage window of battery core
Capacity.
Further, in step s 2, the voltage range of the actual use is obtained by charge and discharge electric cabinet.
Further, the nominal capacity of the battery core is C0, the range of corresponding battery power is [0, C0], actual use
Capacity is C1, the range of corresponding practical electricity is [C2, C3], then there is 0 < C2<C3<C。
Further, in the step S3, if battery core is in the nominal capacity C0Under corresponding SOC be [0,100%],
The capacity C of actual use1The range of corresponding SOCreal is [SOCrealmin, SOCrealmax], then has
Further, in the step S4:
Wherein SOCreal=[SOCrealmin, SOCrealmax], SOCrealmin is under the capacity of battery core actual use
Corresponding SOC minimum value, SOCrealmax are corresponding SOC maximum value under the capacity that battery core actually uses.
Quantify SOC under battery nominal capacity and use section:
Assuming that battery core nominal voltage window is [Vmin0, Vmax0], corresponding nominal capacity is C0, corresponding battery power
Range is [0, C0], corresponding to SOC under nominal capacity is [0,100%].Therefore the deep cycle life filled deep film playback and ring power battery,
Common customer is in order to evade this problem, in actual use, will not all select [Vmin0, Vmax0] this voltage window, generally
Vmin is compared in lower voltage limit selection0High a little to be indicated with Vmin, Vmax is compared in general upper limit voltage selection0It is lower, with Vmax table
Show, i.e., the voltage window that battery core really uses is [Vmin, Vmax].Then we are found by the method for battery core volume test
The corresponding actual use capacity C of [Vmin, Vmax] window1, capacity C1Corresponding electricity range is [C2, C3], it is corresponding
The range of SOCreal is that [SOCrealmin, SOCrealmax] (SOCrealmin is higher than 0%, SOCrealmax is than 100%
It is low), the capacity surplus thus reserved to nominal capacity bound is quantified: it uses voltage window [Vmin, Vmax],
Corresponding [SOCrealmin, SOCrealmax].
As shown in figure 3, the capacity test method is to carry out nominal voltage window Vmin to battery core by charge and discharge electric cabinet0-
Vmax0Under charge and discharge, obtain and nominal capacity C0Relation table；
If actual use capacity is it is known that the voltage range of battery core actual use can be checked according to known capacity by chart
[Vmin, Vmax]；
Similarly, if the voltage range [Vmin, Vmax] of battery core actual use by the table it is known that can check in actual use
Capacity C1。
According to aforementioned, SOCreal is [SOCrealmin, SOCrealmax] using section, and battery is in practical application
It is required that in addition SOC display interval must be 0%-100%, therefore need to do SOC estimation all the way, really may be used for indicating that battery is shown
SOC is indicated with SOCuse.
As shown in Fig. 2, using the estimation of the true state-of-charge of voltage (capacity) window when SOCuse is for battery applications.
It is clear that SOCuse[0%, 100%] corresponding SOCreal[SOCrealmin, SOCrealmax], i.e., under any situation
SOCuse all with the mapping relations one by one of SOCreal existence anduniquess.
The relationship of function of a single variable is followed between SOCreal and SOCuse by can be determined that above, i.e., available y=a*x+b table
Show.Assignment SOCreal=x, x=[SOCrealmin, SOCrealmax], assignment SOCuse=y, y=[0%, 100%], if
Two constants are a, b, substitute into y=a*x+b, then have as shown in table 1:
Table 1
| X(SOCreal) | Y(SOCuse) |
| SOCmin | 0% |
| SOCmax | 100% |
0=a*SOCrealmin+b (1)
1=a*SOCrealmax+b (2)
So a=1/ (SOCrealmax-SOCrealmin)
B=SOCrealmin/ (SOCrealmax-SOCrealmin)
SOCreal, SOCuse, a, b are brought into y=a*x+b formula, obtain relational expression (3):
SOCuse=(SOCreal-SOCrealmin)/(SOCrealmax-SOCrealmin) (3)
More than, relational expression (3), which represents, to be shown when the corresponding relationship, i.e. battery practical application of SOCuse and SOCreal
Really available SOC calculation method.
Working principle of the present invention: battery core nominal voltage window is obtained, the nominal appearance of battery core is determined by nominal voltage window
Amount；The battery core capacity of actual use is determined according to the voltage range that battery core actual needs uses, the battery core of the actual use is held
Amount should be less than the nominal capacity of battery core, determines actual use SOC range according to the battery core capacity of actual use, that is, determines
SOCreal is converted into SOCuse by SOCreal range.
The present invention provides a kind of SOC estimation method for solving battery different capabilities demand, can quantify bound and use capacity
Percentage more effectively avoids the deep critical battery put deeply, and demarcated under nominal window that fills from using parameter straight based on road SOC
Scoop out use, time saving, laborsaving, cost-saving.
The basic principles, main features and advantages of the present invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, various changes and improvements may be made to the invention without departing from the spirit and scope of the present invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent defines.
Claims (6)
1. a kind of SOC estimation method for solving battery difference and using capacity requirement, which comprises the following steps:
S1 obtains battery core nominal voltage window, the nominal capacity of battery core is determined by nominal voltage window；
S2 determines the battery core capacity of actual use, the electricity of the actual use according to the voltage range that battery core actual needs uses
Core capacity should be less than the nominal capacity of battery core；
S3 determines the range of SOCreal according to the battery core capacity of actual use；
SOCreal is converted into SOCuse by S4.
2. a kind of SOC estimation method for solving battery difference and using capacity requirement according to claim 1, feature exist
In, it is described in step sl, the nominal capacity of battery core is determined by charge and discharge electric cabinet according to the nominal voltage window of battery core.
3. a kind of SOC estimation method for solving battery difference and using capacity requirement according to claim 1, feature exist
In obtaining the battery core capacity of the actual use by charge and discharge electric cabinet in the step S2.
4. a kind of SOC estimation method for solving battery difference and using capacity requirement according to claim 1, feature exist
In if the nominal capacity of the battery core is C0, the range of corresponding battery power is [0, C0], the battery core capacity of actual use is C1,
The range of corresponding practical electricity is [C2, C3], then there is 0 < C2<C3<C。
5. a kind of SOC estimation method for solving battery difference and using capacity requirement according to claim 1, feature exist
In in the step S3, if battery core is in the nominal capacity C0Under corresponding SOC range be [0,100%], actual use
Capacity C1The range of corresponding SOCreal is [SOCrealmin, SOCrealmax], then has
6. a kind of SOC estimation method for solving battery difference and using capacity requirement according to claim 1, feature exist
In in the step S4:
Wherein, SOCreal=[SOCrealmin, SOCrealmax], SOCrealmin is right under the capacity that battery core actually uses
The SOC minimum value answered, SOCrealmax are corresponding SOC maximum value under the capacity that battery core actually uses.
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| WO2023207671A1 (en) * | 2022-04-27 | 2023-11-02 | 华为技术有限公司 | Battery level state determination method |
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Effective date of registration: 20200519 Address after: Room g0232, headquarters building, Changsha Zhongdian Software Park, No. 39, Jianshan Road, high tech Development Zone, Changsha City, Hunan Province Applicant after: Thornton New Energy Technology (Changsha) Co.,Ltd. Address before: 411100 Hunan province Xiangtan City Jiuhua Demonstration Zone No. 78 West Benz Applicant before: SOUNDON NEW ENERGY TECHNOLOGY Co.,Ltd. |
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Application publication date: 20190215 |