CN109061486B - Method and system for determining constant-current charging cut-off time point - Google Patents
Method and system for determining constant-current charging cut-off time point Download PDFInfo
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Abstract
The embodiment of the invention provides a method and a system for determining a constant current charging cut-off time point, wherein the method comprises the following steps: acquiring a current value of the charging current and generating a current sequence; calculating a difference sequence through the current sequence; calculating the current value change degree of each time point through the difference sequence; generating a current mutation number sequence according to the preset window length time and the current value change degree of each time point; generating a constant current terminal index sequence according to the current mutation number sequence; calculating the maximum value of the constant-current terminal index in the constant-current terminal index sequence; calculating a plurality of alternative constant current charging cut-off time points according to a preset constant current fluctuation correction parameter and a constant current terminal index maximum value, and establishing a set by adopting the plurality of alternative constant current charging cut-off time points; find the maximum value in the set and take the maximum value as the constant current charge cutoff time point. The method and the device realize the automation of determining the constant-current charging cut-off time point and improve the efficiency of analyzing the charging data of the power battery.
Description
Technical Field
The invention relates to the technical field of rechargeable batteries, in particular to a method for determining a constant-current charging cut-off time point and a system for determining the constant-current charging cut-off time point.
Background
With the development and popularization of electric vehicles in recent years, large-scale production and deployment of power batteries are accompanied. The lithium ion power battery is used as an energy carrier of an electric automobile, and has a completely different mode from a traditional fuel automobile when being used for energy supplement.
Generally, the charging process for a lithium ion power battery is divided into two stages of constant current charging and constant voltage charging, and information generated in the two stages has different characteristics, so that the two stages have different analysis values.
When the charging process is in a constant current stage, due to the problems of equipment or operation and the like, the actual charging current is not necessarily completely constant, and the situation that the current is temporarily increased or decreased is likely to occur, meanwhile, because the common lithium ion power battery has internal resistance of the battery certainly, the instability of the current also causes the instability of the voltage, so that the voltage reaches an end condition in advance, and finally the judgment of a constant current end point is deviated, which is an atypical situation in data analysis.
However, in the existing data analysis, only the atypical situation can be inferred by manual observation, and the constant current cut-off point is determined, which causes the existing analysis method to fail to automatically analyze the charging data of the power battery, thereby causing the analysis efficiency of the charging data of the power battery to be extremely low.
Disclosure of Invention
In view of the above problems, embodiments of the present invention are provided to provide a method of determining a constant current charging off-time point and a corresponding system of determining a constant current charging off-time point, which overcome or at least partially solve the above problems.
In order to solve the above problem, an embodiment of the present invention discloses a method for determining a constant current charge cut-off time point, where the method is applied to a charging process of a power battery, where the charging process has a corresponding charging current, and the method includes:
acquiring a current value of the charging current and generating a current sequence;
calculating a difference sequence through the current sequence;
calculating the current value change degree of each time point through the difference sequence;
generating a current mutation number sequence according to the preset window length time and the current value change degree of each time point;
generating a constant current terminal index sequence according to the current mutation number sequence;
calculating the maximum value of the constant-current terminal index in the constant-current terminal index sequence;
calculating a plurality of alternative constant current charging cut-off time points according to preset constant current fluctuation correction parameters and the maximum value of the constant current terminal index, and establishing a set by adopting the alternative constant current charging cut-off time points;
and finding out the maximum value in the set, and taking the maximum value as a constant current charging cut-off time point.
Preferably, the step of obtaining the current value of the charging current and generating the current sequence includes:
sequentially acquiring a plurality of current values according to a plurality of preset time points; the current values correspond to the time points one by one;
a current sequence is generated using a plurality of time points and the plurality of current values in one-to-one correspondence therewith.
Preferably, the step of calculating a sequence of difference values from the sequence of currents comprises:
calculating a plurality of current difference values by adopting the current value corresponding to each time point in the current sequence and the current value corresponding to the previous time point of the time point;
and generating a difference sequence by using the plurality of current difference values.
Preferably, the step of calculating the current value change degree at each time point by the difference sequence includes:
and determining the current value change degree of each time point by judging whether the current difference value in the difference value sequence is larger than a preset threshold value.
Preferably, the constant current fluctuation correction parameter approaches 1.
The embodiment of the invention also discloses a system for determining the cut-off time point of constant current charging, which is applied to the charging process of a power battery, wherein the charging process has corresponding charging current, and the system comprises:
the current sequence generation module is used for acquiring the current value of the charging current and generating a current sequence;
the difference sequence calculating module is used for calculating a difference sequence through the current sequence;
the current value change degree calculation module is used for calculating the current value change degree of each time point through the difference sequence;
the current mutation number sequence generation module is used for generating a current mutation number sequence according to the preset window length time and the current value change degree of each time point;
the constant current terminal index sequence generation module is used for generating a constant current terminal index sequence according to the current mutation number sequence;
the constant current terminal index maximum value calculating module is used for calculating a constant current terminal index maximum value in the constant current terminal index sequence;
the set establishing module is used for calculating a plurality of alternative constant current charging cut-off time points according to preset constant current fluctuation correction parameters and the maximum value of the constant current terminal index and establishing a set by adopting the alternative constant current charging cut-off time points;
and the constant current charging cut-off time point determining module is used for finding out the maximum value in the set and taking the maximum value as the constant current charging cut-off time point.
Preferably, the current sequence generation module includes:
the current value obtaining submodule is used for sequentially obtaining a plurality of current values according to a plurality of preset time points; the current values correspond to the time points one by one;
and the current sequence generation submodule is used for generating a current sequence by adopting a plurality of time points and the plurality of current values which are in one-to-one correspondence with the time points.
Preferably, the difference sequence calculating module includes:
the current difference value calculation submodule is used for calculating a plurality of current difference values by adopting a current value corresponding to each time point in the current sequence and a current value corresponding to a previous time point of the time point;
and the difference sequence generation submodule is used for generating a difference sequence by adopting the plurality of current differences.
Preferably, the current value change degree calculation module includes:
and the current value change degree determining submodule is used for determining the current value change degree of each time point by judging whether the current difference value in the difference value sequence is greater than a preset threshold value.
Preferably, the constant current fluctuation correction parameter approaches 1.
In practical application, by applying the embodiment of the invention, a current sequence can be generated by the current value of the charging current obtained by the power battery charging system, a difference sequence is calculated by the current sequence, the current value change degree of each time point is calculated by the difference sequence, a current mutation number sequence is generated according to the preset window length time and the current value change degree of each time point, a constant current terminal index sequence is generated according to the current mutation number sequence, the maximum value of the constant current terminal index in the constant current terminal index sequence is calculated, the parameter is corrected by the preset constant current fluctuation, and the maximum value of the constant current terminal index is calculated to obtain a plurality of constant current charging cut-off time points, a set is established by adopting the plurality of constant current charging cut-off time points, the maximum value is found in the set and is taken as the constant current charging cut-off time point, thereby realizing the automation of determining, the efficiency of analyzing the charging data of the power battery is greatly improved.
Furthermore, the embodiment of the invention can also automatically identify the charging process of the power battery
Drawings
Fig. 1 is a flow chart of the steps of one embodiment of a method of determining a constant current charge cutoff time point of the present invention;
fig. 2 is a block diagram of an embodiment of a system for determining a constant current charging off-time point according to the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1, a flowchart illustrating steps of an embodiment of a method for determining a constant current charging cutoff time point according to the present invention is shown, and specifically may include the following steps:
in practical applications, the embodiment of the invention can be applied to a charging system of a power battery, for example, a charging system of a mobile terminal, a charging system of an electric vehicle, and the like.
In the embodiment of the present invention, a plurality of current values may be sequentially obtained according to a plurality of preset time points, and then a current sequence may be generated by using the plurality of time points and the plurality of current values corresponding to the plurality of time points one to one.
In a specific implementation, the embodiment of the present invention may set up n time points at any required time length, and sequentially obtain current values of a plurality of charging currents according to the set up n time periods, where the plurality of current values correspond to the plurality of time points one to one, specifically, the current sequence I ═ { I ═ I {, in this way, the current1,i2,i3,...,inThe corners of the sequence are labeled as corresponding time points, where time point 1 is the charge start time and time point n is the charge end time.
in the embodiment of the present invention, a plurality of current difference values may be calculated by using a current value corresponding to each time point in the current sequence and a current value corresponding to a previous time point of the time point, and then the difference sequence may be generated by using the plurality of current difference values.
In a specific implementation, the embodiment of the present invention may be implemented according to the formula d1＝0；
Calculating the difference value of the current of each time point in the sequence and the current of the previous time point of the time point to obtain a current difference value sequence D ═ D { (D)1,d2,d3,...,dn}。
in the embodiment of the present invention, the current value change degree at each time point may be determined by determining whether the current difference value in the difference value sequence is greater than a preset threshold value.
In a specific implementation, the embodiment of the present invention may set the current variation threshold Δ according to the battery charging characteristics, according to the formula bk＝0,
Calculating a current mutation sequence B ═ B indicating the degree of change in the current value1,b2,b3,...,bn}。
In practical applications, the embodiment of the present invention may determine the cause of the current variation according to the current value variation degree, specifically, if the current difference is greater than the preset threshold, the current variation is caused by a current drop phenomenon in constant voltage charging or a current instability phenomenon in constant current charging, and if the current difference is less than the preset threshold, the current variation is caused by a random disturbance phenomenon of the current.
104, generating a current mutation number sequence according to the preset window length time and the current value change degree of each time point;
in a specific implementation, the window length time that can be preset in the embodiment of the present invention is t according to a formula
Calculating and generating a current mutation number sequence C ═ { C ═ C1,c2,c3,...,cn}。
105, generating a constant current terminal index sequence according to the current mutation number sequence;
in a specific implementation, the embodiments of the present invention may be based on a formula
Calculating to generate a constant-current end index sequence E ═ { E ═ E1,e2,e3,...,en}。
in a specific implementation, the embodiment of the invention can calculate the maximum value E of the constant current end index in the sequence E through calculationmax。
in a specific implementation, the embodiment of the invention can be preset to be constantA flow fluctuation correction parameter lambda and according to the formula ek≥emaxAnd x λ selecting all elements E 'meeting the conditions in the sequence E, and establishing a set K consisting of all alternative constant current charging cut-off time points by taking subscripts of all elements in E' as alternative constant current charging cut-off time points.
In a preferred embodiment of the present invention, the constant current fluctuation correction parameter λ may be set to be close to 1 in advance.
And step 108, finding out the maximum value in the set, and taking the maximum value as a constant current charging cut-off time point.
In a specific implementation, the embodiment of the present invention may obtain a maximum value max (K) from the set K as a constant current charging cutoff time point.
In order to make the technical solution of the present invention better understood by those skilled in the art, a complete example is given below to illustrate the technical solution of the present invention:
of course, the above examples are merely examples, and those skilled in the art may also determine the constant current charging cut-off time point by using any one or more of the current value, the current sequence, the difference sequence, the current value variation degree, the window length time, the current mutation number sequence, the constant current end index maximum value, the constant current fluctuation correction parameter, the alternative constant current charging cut-off time point, and a set having a plurality of alternative constant current charging cut-off time points according to the actual situation in other manners, which is not limited by the embodiment of the present invention.
It should be noted that, for simplicity of description, the method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the illustrated order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments of the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.
In practical application, by applying the embodiment of the invention, a current sequence can be generated by the current value of the charging current obtained by the power battery charging system, a difference sequence is calculated by the current sequence, the current value change degree of each time point is calculated by the difference sequence, a current mutation number sequence is generated according to the preset window length time and the current value change degree of each time point, a constant current terminal index sequence is generated according to the current mutation number sequence, the maximum value of the constant current terminal index in the constant current terminal index sequence is calculated, the parameter is corrected by the preset constant current fluctuation, and the maximum value of the constant current terminal index is calculated to obtain a plurality of constant current charging cut-off time points, a set is established by adopting the plurality of constant current charging cut-off time points, the maximum value is found in the set and is taken as the constant current charging cut-off time point, thereby realizing the automation of determining, the efficiency of analyzing the charging data of the power battery is greatly improved.
Referring to fig. 2, a block diagram of a system embodiment for determining a constant current charging off-time point according to the present invention is shown, and specifically, the system embodiment may include the following modules:
a current sequence generating module 201, configured to obtain a current value of the charging current, and generate a current sequence;
a difference sequence calculating module 202, configured to calculate a difference sequence through the current sequence;
a current value change degree calculation module 203, configured to calculate a current value change degree at each time point according to the difference sequence;
a current mutation number sequence generation module 204, configured to generate a current mutation number sequence according to a preset window length time and a current value change degree of each time point;
a constant current terminal index sequence generation module 205, configured to generate a constant current terminal index sequence according to the current mutation number sequence;
a constant-current terminal index maximum value calculating module 206, configured to calculate a constant-current terminal index maximum value in the constant-current terminal index sequence;
the set establishing module 207 is configured to calculate a plurality of alternative constant current charging cut-off time points according to preset constant current fluctuation correction parameters and the maximum constant current terminal index value, and establish a set by using the plurality of alternative constant current charging cut-off time points;
and a constant current charging cut-off time point determining module 208, configured to find a maximum value in the set, and use the maximum value as a constant current charging cut-off time point.
In a preferred embodiment of the present invention, the current sequence generating module 201 may further include the following sub-modules:
the current value obtaining submodule is used for sequentially obtaining a plurality of current values according to a plurality of preset time points; the current values correspond to the time points one by one;
and the current sequence generation submodule is used for generating a current sequence by adopting a plurality of time points and the plurality of current values which are in one-to-one correspondence with the time points.
In a preferred embodiment of the present invention, the difference sequence calculating module 202 may further include the following sub-modules:
the current difference value calculation submodule is used for calculating a plurality of current difference values by adopting a current value corresponding to each time point in the current sequence and a current value corresponding to a previous time point of the time point;
and the difference sequence generation submodule is used for generating a difference sequence by adopting the plurality of current differences.
In a preferred embodiment of the present invention, the current value variation degree calculating module 203 may further include the following sub-modules:
and the current value change degree determining submodule is used for determining the current value change degree of each time point by judging whether the current difference value in the difference value sequence is greater than a preset threshold value.
And calculating the current value change degree, wherein the constant current fluctuation correction parameter approaches to 1.
In practical application, by applying the embodiment of the invention, a current sequence can be generated by the current value of the charging current obtained by the power battery charging system, a difference sequence is calculated by the current sequence, the current value change degree of each time point is calculated by the difference sequence, a current mutation number sequence is generated according to the preset window length time and the current value change degree of each time point, a constant current terminal index sequence is generated according to the current mutation number sequence, the maximum value of the constant current terminal index in the constant current terminal index sequence is calculated, the parameter is corrected by the preset constant current fluctuation, and the maximum value of the constant current terminal index is calculated to obtain a plurality of constant current charging cut-off time points, a set is established by adopting the plurality of constant current charging cut-off time points, the maximum value is found in the set and is taken as the constant current charging cut-off time point, thereby realizing the automation of determining, the efficiency of analyzing the charging data of the power battery is greatly improved.
For the system embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create a system for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction system which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The method for determining the constant current charging cut-off time point and the system for determining the constant current charging cut-off time point provided by the invention are described in detail, specific examples are applied in the text to explain the principle and the implementation mode of the invention, and the description of the examples is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A method for determining a constant current charge cut-off time point, wherein the method is applied to a charging process of a power battery, the charging process having a corresponding charging current, and the method comprises:
acquiring a current value of the charging current and generating a current sequence;
calculating a difference sequence through the current sequence;
calculating the current value change degree of each time point through the difference sequence;
generating a current mutation number sequence according to the preset window length time and the current value change degree of each time point;
according to the number of current mutationSequence generation constant-current end index sequence E ═ E1,e2,e3,...,en}；
Calculating the maximum value of the constant-current terminal index in the constant-current terminal index sequence;
calculating a plurality of alternative constant current charging cut-off time points according to preset constant current fluctuation correction parameters and the maximum value of the constant current terminal index, and establishing a set by adopting the alternative constant current charging cut-off time points;
finding out a maximum value in the set, and taking the maximum value as a constant current charging cut-off time point;
wherein the constant current end index sequence E ═ { E ═ E1,e2,e3,...,enAccording to the formula
To obtain ikFor current values corresponding to the kth time point, ckThe current mutation number is the kth value in the sequence.
2. The method of claim 1, wherein the step of obtaining current values of the charging current and generating a current sequence comprises:
sequentially acquiring a plurality of current values according to a plurality of preset time points; the current values correspond to the time points one by one;
a current sequence is generated using a plurality of time points and the plurality of current values in one-to-one correspondence therewith.
3. The method of claim 1, wherein the step of calculating a sequence of difference values from the sequence of currents comprises:
calculating a plurality of current difference values by adopting the current value corresponding to each time point in the current sequence and the current value corresponding to the previous time point of the time point;
and generating a difference sequence by using the plurality of current difference values.
4. The method of claim 1, wherein the step of calculating the current value variation degree at each time point by the difference sequence comprises:
and determining the current value change degree of each time point by judging whether the current difference value in the difference value sequence is larger than a preset threshold value.
5. The method of claim 1, wherein the constant current ripple correction parameter approaches 1.
6. A system for determining a constant current charge cutoff time point, the system being adapted for use in a charging process for a power cell, the charging process having a corresponding charging current, the system comprising:
the current sequence generation module is used for acquiring the current value of the charging current and generating a current sequence;
the difference sequence calculating module is used for calculating a difference sequence through the current sequence;
the current value change degree calculation module is used for calculating the current value change degree of each time point through the difference sequence;
a current mutation number sequence generation module, configured to generate a current mutation number sequence E ═ E { according to a preset window length time and a current value change degree of each time point1,e2,e3,...,en}；
The constant current terminal index sequence generation module is used for generating a constant current terminal index sequence according to the current mutation number sequence;
the constant current terminal index maximum value calculating module is used for calculating a constant current terminal index maximum value in the constant current terminal index sequence;
the set establishing module is used for calculating a plurality of alternative constant current charging cut-off time points according to preset constant current fluctuation correction parameters and the maximum value of the constant current terminal index and establishing a set by adopting the alternative constant current charging cut-off time points;
the constant current charging cut-off time point determining module is used for finding out the maximum value in the set and taking the maximum value as the constant current charging cut-off time point;
wherein the constant current end index sequence E ═ { E ═ E1,e2,e3,...,enAccording to the formula
To obtain ikFor current values corresponding to the kth time point, ckThe current mutation number is the kth value in the sequence.
7. The system of claim 6, wherein the current sequence generation module comprises:
the current value obtaining submodule is used for sequentially obtaining a plurality of current values according to a plurality of preset time points; the current values correspond to the time points one by one;
and the current sequence generation submodule is used for generating a current sequence by adopting a plurality of time points and the plurality of current values which are in one-to-one correspondence with the time points.
8. The system of claim 6, wherein the difference sequence calculation module comprises:
the current difference value calculation submodule is used for calculating a plurality of current difference values by adopting a current value corresponding to each time point in the current sequence and a current value corresponding to a previous time point of the time point;
and the difference sequence generation submodule is used for generating a difference sequence by adopting the plurality of current differences.
9. The system of claim 6, wherein the current value change degree calculation module comprises:
and the current value change degree determining submodule is used for determining the current value change degree of each time point by judging whether the current difference value in the difference value sequence is greater than a preset threshold value.
10. The system of claim 6, wherein the constant current ripple correction parameter approaches 1.
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