CN111220911A - Method and device for judging polarization state of lithium iron phosphate battery and electronic equipment - Google Patents
Method and device for judging polarization state of lithium iron phosphate battery and electronic equipment Download PDFInfo
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Abstract
The invention provides a method and a device for judging the polarization state of a lithium iron phosphate battery and electronic equipment, and relates to the technical field of battery polarization state judgment, wherein the method comprises the steps of obtaining a current SOC value, obtaining SOC values at two ends of a current interval corresponding to the current SOC value and OCV values corresponding to the SOC values at two ends of the current interval from an OCV table; determining a first ratio value according to the SOC values at the two ends and the OCV value corresponding to the SOC values; determining a current OCV value corresponding to the current SOC value; determining a second ratio value according to the current SOC value, the current OCV value and the SOC values at the two ends of the current interval corresponding to the current SOC value; and judging whether the difference value of the first ratio value and the second ratio value exceeds a preset threshold value, and if so, judging that the battery is in a polarization state. The method can realize the accuracy of the polarization state diagnosis of the lithium iron phosphate battery, avoid misjudgment and provide reliable basis for accurately calculating the current electric quantity.
Description
Technical Field
The invention relates to the technical field of battery polarization state judgment, in particular to a method and a device for judging the polarization state of a lithium iron phosphate battery and electronic equipment.
Background
The polarization effect is an effect that after the battery is charged or discharged with continuous large current for a long time, the voltage of the battery cell deviates from the normal voltage due to the existence of internal resistance and internal capacitance, and the battery cell cannot be automatically restored to the normal state in a short time. Typically, a battery manufacturer will provide an open circuit voltage measurement (OCV) data table indicating the relationship between battery voltage and battery State of charge (SOC).
At present, lithium iron phosphate batteries are mostly applied to electric vehicles, hybrid vehicles or other energy storage devices, when a battery management system of the electric vehicles, hybrid vehicles or other energy storage devices judges the polarization state of a battery, the strength of a polarization effect is usually judged by using absolute pressure difference, but because the platform period of the lithium iron phosphate batteries is longer, and for the polarization effect with the same effect in a non-platform period and a platform period, the voltage difference values expressed by the lithium iron phosphate batteries are different, so that the judgment result has larger error, error judgment is easy to make, and the calculation of the electric quantity of the battery in the next step is influenced.
Disclosure of Invention
The invention aims to provide a method and a device for judging the polarization state of a lithium iron phosphate battery and electronic equipment, which can realize the accuracy of the polarization state diagnosis of the lithium iron phosphate battery, avoid misjudgment and provide a reliable basis for accurately calculating the current electric quantity.
In a first aspect, the present invention provides a method for determining a polarization state of a lithium iron phosphate battery, including:
acquiring a current SOC value, acquiring SOC values at two ends of a current interval corresponding to the current SOC value and OCV values corresponding to the SOC values at two ends of the current interval from an OCV table;
determining a first ratio value according to the SOC values at two ends of the current interval corresponding to the current SOC value and the OCV values corresponding to the SOC values at two ends of the current interval;
determining a current OCV value corresponding to the current SOC value; determining a second ratio value according to the current SOC value, the current OCV value and the SOC values at the two ends of the current interval corresponding to the current SOC value;
and judging whether the difference value of the first ratio value and the second ratio value exceeds a preset threshold value, and if so, judging that the battery is in a polarization state.
In an alternative embodiment, determining the current OCV value corresponding to the current SOC value comprises:
and judging the polarization intensity level of the battery according to the difference value of the first ratio value and the second ratio value.
In an alternative embodiment, the method further comprises:
determining the temperature of the current battery, and determining a first OCV table and a second OCV table which are met by the temperature of the current battery;
determining a first OCV value according to the current SOC value and a first OCV table;
determining a second OCV value according to the current SOC value and a second OCV table;
determining an average value of the first OCV value and the second OCV value, and taking the average value of the first OCV value and the second OCV value as the current OCV value; alternatively, the current OCV value is determined according to the first OCV value, the second OCV value, and a linear inner difference method.
In an alternative embodiment, the first ratio value is determined by:
wherein Rs represents a first ratio value, V1 and V2 represent OCV values corresponding to SOC values at both ends of the current interval, respectively, and SOC2 and SOC1 represent SOC values at both ends of the current interval corresponding to the current SOC values obtained from the OCV table, respectively;
determining a second ratio value by:
where Rn represents the second ratio value, Vn represents the current OCV value, and SOCn represents the current SOC value.
In a second aspect, the present invention provides a device for determining a polarization state of a lithium iron phosphate battery, including:
the acquisition module is used for acquiring a current SOC value, acquiring SOC values at two ends of a current interval corresponding to the current SOC value and OCV values corresponding to the SOC values at two ends of the current interval from the OCV table;
the first ratio module is used for determining a first ratio according to the SOC values at the two ends of the current interval corresponding to the current SOC value and the OCV values corresponding to the SOC values at the two ends of the current interval;
the second ratio value module is used for determining a current OCV value corresponding to the current SOC value; determining a second ratio value according to the current SOC value, the current OCV value and the SOC values at the two ends of the current interval corresponding to the current SOC value;
and the judging module is used for judging whether the difference value of the first ratio value and the second ratio value exceeds a preset threshold value, and if so, judging that the battery is in a polarization state.
In an alternative embodiment, the method further comprises:
and the polarization level module is used for judging the polarization intensity level of the battery according to the difference value of the first ratio value and the second ratio value.
In an alternative embodiment, the method further comprises:
the determining module is used for determining the temperature of the current battery and determining a first OCV table and a second OCV table which are met by the temperature of the current battery;
the first OCV value module is used for determining a first OCV value according to the current SOC value and a first OCV table;
the second OCV value module is used for determining a second OCV value according to the current SOC value and a second OCV table;
a current OCV value module for determining an average of the first and second OCV values, the average of the first and second OCV values being the current OCV value; alternatively, the current OCV value is determined according to the first OCV value, the second OCV value, and a linear inner difference method.
Wherein Rs represents a first ratio value, V1 and V2 represent OCV values corresponding to SOC values at both ends of the current interval, respectively, and SOC2 and SOC1 represent SOC values at both ends of the current interval corresponding to the current SOC values obtained from the OCV table, respectively;
determining a second ratio value by:
wherein Rn respectively represents a second ratio value, Vn represents the current OCV value, and SOCn represents the current SOC value.
In a third aspect, embodiments provide an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor implements the steps of the method of any one of the foregoing embodiments when executing the computer program.
In a fourth aspect, embodiments provide a computer readable medium having non-volatile program code executable by a processor, the program code causing the processor to perform the method of any of the preceding embodiments.
According to the method, the device and the electronic equipment for judging the polarization state of the lithium iron phosphate battery, provided by the invention, the SOC values at two ends corresponding to the current SOC value are determined through the obtained current SOC value, and the OCV values corresponding to the SOC values at two ends of the current interval are determined, so that a first ratio value is determined; determining a second ratio value according to the current SOC value, the current OCV value and the SOC values at the two ends of the current interval corresponding to the current SOC value; judging whether the battery is in the polarization state or not according to the difference value of the first ratio value and the second ratio value, and if the difference value of the first ratio value and the second ratio value exceeds a preset threshold value, judging that the battery is in the polarization state; according to the invention, the difference value between the first ratio value and the second ratio value is adopted for judgment, so that the error judgment caused by the voltage error of the battery in the polarization state can be avoided, the accuracy of the polarization state diagnosis of the lithium iron phosphate battery can be realized, and a basis is provided for conveniently estimating the current battery state and accurately calculating the current electric quantity.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a method for determining a polarization state of a lithium iron phosphate battery according to an embodiment of the present invention;
fig. 2 is another flowchart of a method for determining a polarization state of a lithium iron phosphate battery according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a device for determining a polarization state of a lithium iron phosphate battery according to an embodiment of the present invention;
fig. 4 is a system schematic diagram of an electronic device according to an embodiment of the present invention.
Icon: 31-an acquisition module; 32-a first ratio value module; 33-a second ratio value module; 34-a discrimination module; 400-an electronic device; 401 — a communication interface; 402-a processor; 403-a memory; 404-bus.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Lithium batteries can be classified into lithium iron phosphate batteries, lithium manganate batteries, lithium cobaltate batteries, ternary batteries and the like according to different anode systems. Lithium iron phosphate batteries are often used in electric vehicles, hybrid vehicles, or other energy storage devices due to their high safety and low cost.
Generally, in a battery management system, a polarization state needs to be judged, and if the polarization degree is large, a conventional method cannot be selected to calculate the current electric quantity.
At present, whether the battery is in a polarization state or not can be judged only by standing the battery for a long time to observe the difference value before and after the voltage falls back, but the voltage difference value expressed by the lithium iron phosphate battery is different for the polarization effect with the same effect of a non-plateau period and a plateau period due to the long plateau period of the lithium iron phosphate battery, so that the judgment result has larger error, and error judgment is easy to make. When the wrong judgment occurs, the electric quantity calculation method of the battery cannot be accurately determined, and the accuracy of electric quantity calculation is influenced.
Based on this, the invention provides a method and a device for judging the polarization state of a lithium iron phosphate battery, and an electronic device, which can realize the accuracy of the polarization state diagnosis of the lithium iron phosphate battery, avoid erroneous judgment, and provide an accurate basis for calculating the current electric quantity.
Referring to fig. 1, the method for determining the polarization state of a lithium iron phosphate battery provided by the invention comprises the following steps:
step S110, acquiring a current SOC value, and acquiring SOC values at two ends of a current interval corresponding to the current SOC value and OCV values corresponding to the SOC values at two ends of the current interval from an OCV table;
step S120, determining a first ratio value according to the SOC values at the two ends of the current interval corresponding to the current SOC value and the OCV values corresponding to the SOC values at the two ends of the current interval;
step S130, determining a current OCV value corresponding to the current SOC value; determining a second ratio value according to the current SOC value, the current OCV value and the SOC values at the two ends of the current interval corresponding to the current SOC value;
step S140, determining whether a difference between the first ratio and the second ratio exceeds a preset threshold, and if so, determining that the battery is in a polarization state.
Specifically, the SOC value, i.e., the state of charge value, reflects the remaining capacity of the battery. The method of the embodiment is applied to the battery control module, and the battery control module detects the residual capacity of the current battery to obtain the current SOC value.
The OCV table is an OCV data table provided by a battery manufacturer, and can indicate a relationship between a battery voltage and a battery SOC, and usually, 5% SOC is taken as a unit, and table 1 is a set of OCV data of a certain lithium iron phosphate battery at 25 ℃.
The data in the OCV table are recorded based on the correspondence between the voltage and the SOC of the battery after a sufficiently long period of standing in a laboratory environment.
Therefore, if the battery has a completely non-polarization effect, the current battery voltage should accurately fall on the OCV curve. According to this principle, if the OCV value corresponding to the current voltage value of the battery and the actual SOC value deviates more, it can be determined that the battery is in the polarization state.
TABLE 1 OCV Table (Voltage unit 0.1mV)
| SOC | 0％ | 5％ | 10％ | 15％ | 20％ | 25％ | 30％ | 35％ |
| OCV value | 28279 | 30832 | 31940 | 32085 | 32292 | 32429 | 32538 | 32638 |
| SOC | 40％ | 45％ | 50％ | 55％ | 60％ | 65％ | 70％ | 75％ |
| OCV value | 32819 | 32912 | 32923 | 32933 | 32941 | 32953 | 32972 | 33004 |
| SOC | 80％ | 85％ | 90％ | 95％ | 100％ | |||
| OCV value | 33194 | 33339 | 33351 | 33362 | 34271 |
For example, the current SOC value is 43%, 43% is located in the interval [ 40%, 45% ], so the SOC values at the two ends of the current interval corresponding to the current SOC value are 40% and 45%, and the OCV values corresponding to the SOC values at the two ends of the current interval are 3281.9mv and 3291.2mv, respectively.
The first ratio is a ratio relation corresponding to the battery voltage and the SOC in the current interval; the second rate value is a rate value of the current SOCn and the current battery OCV value Vn within the present SOC interval.
Determining the first ratio value by:
wherein Rs represents a first ratio value, V1 and V2 represent OCV values corresponding to SOC values at both ends of the current section, respectively, and SOC2 and SOC1 represent SOC values at both ends of the current section corresponding to the current SOC values obtained from the OCV table, respectively.
Determining a second ratio value by:
where Rn represents the second ratio value, Vn represents the current OCV value, and SOCn represents the current SOC value.
Also for the example of S0Cn being 43% in the above example, Rs is:
(3291.2–3281.9)/(45％-40％)＝1.86mV/％；
rn is:
(3267–3281.9)/(43％-40％)＝-4.97mV/％。
from the result, it is known that the difference between Rs and Rn is large and the directions are different, and it is determined that the battery is in a polarization state and is in discharge polarization according to the result.
Optionally, the method for determining the polarization state of the lithium iron phosphate battery in the embodiment further includes the following steps:
and judging the polarization intensity level of the battery according to the difference value of the first ratio value and the second ratio value.
Specifically, a plurality of levels, one for each intensity level, are set for the difference between Rs and Rn.
And setting a plurality of polarization intensity grades, and outputting the current polarization intensity grade to a display module connected with the battery management system, so that a user can obtain the accurate polarization intensity grade.
Optionally, referring to fig. 2, the determining the current OCV value corresponding to the current SOC value in step S130 in the method for determining the polarization state of the lithium iron phosphate battery in the foregoing embodiment includes the following steps:
step S210, determining the temperature of the current battery, and determining a first OCV table and a second OCV table which are met by the temperature of the current battery;
step S220, determining a first OCV value according to the current SOC value and a first OCV table;
step S230, determining a second OCV value according to the current SOC value and a second OCV table;
step S240, determining an average value of the first OCV value and the second OCV value, and taking the average value of the first OCV value and the second OCV value as a current OCV value; alternatively, the current OCV value is determined according to the first OCV value, the second OCV value, and a linear inner difference method.
Specifically, two OCV tables adjacent to the current temperature are determined according to the current temperature, and a first OCV value and a second OCV value corresponding to the current SOC value are looked up from the two OCV tables. And calculating the average value of the first OCV value and the second OCV value, and taking the average value as the current OCV value corresponding to the current SOC value.
Linear interpolation means that if there is a linear relationship between two quantities, the linear relationship is used to find the value of the unknown quantity.
In this embodiment, one of the first OCV table and the second OCV table is selected, a current interval corresponding to the current SOC value is determined from the table, then, the current OCV value corresponding to the current SOC value is calculated according to the SOC values at two ends of the current interval corresponding to the current SOC value and the OCV values corresponding to the SOC values at two ends of the current interval, and a linear interpolation method is combined to calculate the current OCV value corresponding to the current SOC value.
For example, the current SOC value is 4%, which corresponds to a range of [ 0%, 5% ] in the selected table, and the OCV value is [28729, 30823], which is calculated according to a linear interpolation: (30823-.
Referring to fig. 3, the device for determining the polarization state of a lithium iron phosphate battery according to this embodiment includes:
an obtaining module 31, configured to obtain a current SOC value, obtain SOC values at two ends of a current interval corresponding to the current SOC value from an OCV table, and obtain OCV values corresponding to SOC values at two ends of the current interval;
a first ratio module 32, configured to determine a first ratio according to the SOC values at two ends of the current interval corresponding to the current SOC value and the OCV values corresponding to the SOC values at two ends of the current interval;
a second ratio value module 33, configured to determine a current OCV value corresponding to the current SOC value; determining a second ratio value according to the current SOC value, the current OCV value and the SOC values at the two ends of the current interval corresponding to the current SOC value;
and the judging module 34 is configured to judge whether a difference between the first ratio and the second ratio exceeds a preset threshold, and if so, judge that the battery is in a polarization state.
Optionally, the device for determining the polarization state of the lithium iron phosphate battery in the above embodiment further includes the following modules:
and the polarization level module is used for judging the polarization intensity level of the battery according to the difference value of the first ratio value and the second ratio value.
Optionally, the device for determining the polarization state of the lithium iron phosphate battery in the above embodiment further includes the following modules:
the determining module is used for determining the temperature of the current battery and determining a first OCV table and a second OCV table which are met by the temperature of the current battery;
the first OCV value module is used for determining a first OCV value according to the current SOC value and a first OCV table;
the second OCV value module is used for determining a second OCV value according to the current SOC value and a second OCV table;
a current OCV value module for determining an average of the first and second OCV values, the average of the first and second OCV values being the current OCV value; alternatively, the current OCV value is determined according to the first OCV value, the second OCV value, and a linear inner difference method.
Optionally, the first ratio value in the above embodiment is determined by:
wherein Rs represents a first ratio value, V1 and V2 represent OCV values corresponding to SOC values at both ends of the current interval, respectively, and SOC2 and SOC1 represent SOC values at both ends of the current interval corresponding to the current SOC values obtained from the OCV table, respectively;
the second ratio value in the above embodiment is determined by the following equation:
where Rn represents the second ratio value, Vn represents the current OCV value, and SOCn represents the current SOC value.
Referring to fig. 4, an embodiment of the present invention further provides an electronic device 400, which includes a communication interface 401, a processor 402, a memory 403, and a bus 404, where the processor 402, the communication interface 401, and the memory 403 are connected by the bus 404; the memory 403 is used for storing a computer program for supporting the processor 402 to execute the method for determining the polarization state of the lithium iron phosphate battery, and the processor 402 is configured to execute the program stored in the memory 403.
Optionally, an embodiment of the present invention further provides a computer readable medium having a non-volatile program code executable by a processor, where the program code causes the processor to execute the method for determining the polarization state of a lithium iron phosphate battery as in the foregoing embodiment.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for judging the polarization state of a lithium iron phosphate battery is characterized by comprising the following steps:
acquiring a current SOC value, acquiring SOC values at two ends of a current interval corresponding to the current SOC value and OCV values corresponding to the SOC values at two ends of the current interval from an OCV table;
determining a first ratio value according to the SOC values at two ends of the current interval corresponding to the current SOC value and the OCV values corresponding to the SOC values at two ends of the current interval;
determining a current OCV value corresponding to the current SOC value; determining a second ratio value according to the current SOC value, the current OCV value and the SOC values at the two ends of the current interval corresponding to the current SOC value;
and judging whether the difference value of the first ratio value and the second ratio value exceeds a preset threshold value, and if so, judging that the battery is in a polarization state.
2. The method of claim 1, further comprising:
and judging the polarization intensity level of the battery according to the difference value of the first ratio value and the second ratio value.
3. The method of claim 1, wherein determining a current OCV value corresponding to a current SOC value comprises:
determining the temperature of the current battery, and determining a first OCV table and a second OCV table which are met by the temperature of the current battery;
determining a first OCV value according to the current SOC value and a first OCV table;
determining a second OCV value according to the current SOC value and a second OCV table;
determining an average value of the first OCV value and the second OCV value, and taking the average value of the first OCV value and the second OCV value as the current OCV value; alternatively, the current OCV value is determined according to the first OCV value, the second OCV value, and a linear inner difference method.
4. The method of claim 1, wherein the first ratio value is determined by:
wherein Rs represents a first ratio value, V1 and V2 represent OCV values corresponding to SOC values at both ends of the current interval, respectively, and SOC2 and SOC1 represent SOC values at both ends of the current interval corresponding to the current SOC values obtained from the OCV table, respectively;
determining a second ratio value by:
where Rn represents the second ratio value, Vn represents the current OCV value, and SOCn represents the current SOC value.
5. The utility model provides a lithium iron phosphate battery polarization state discriminating gear which characterized in that includes:
the acquisition module is used for acquiring a current SOC value, acquiring SOC values at two ends of a current interval corresponding to the current SOC value and OCV values corresponding to the SOC values at two ends of the current interval from the OCV table;
the first ratio module is used for determining a first ratio according to the SOC values at the two ends of the current interval corresponding to the current SOC value and the OCV values corresponding to the SOC values at the two ends of the current interval;
the second ratio value module is used for determining a current OCV value corresponding to the current SOC value; determining a second ratio value according to the current SOC value, the current OCV value and the SOC values at the two ends of the current interval corresponding to the current SOC value;
and the judging module is used for judging whether the difference value of the first ratio value and the second ratio value exceeds a preset threshold value, and if so, judging that the battery is in a polarization state.
6. The apparatus of claim 5, further comprising:
and the polarization level module is used for judging the polarization intensity level of the battery according to the difference value of the first ratio value and the second ratio value.
7. The apparatus of claim 5, further comprising:
the determining module is used for determining the temperature of the current battery and determining a first OCV table and a second OCV table which are met by the temperature of the current battery;
the first OCV value module is used for determining a first OCV value according to the current SOC value and a first OCV table;
the second OCV value module is used for determining a second OCV value according to the current SOC value and a second OCV table;
a current OCV value module for determining an average of the first and second OCV values, the average of the first and second OCV values being the current OCV value; alternatively, the current OCV value is determined according to the first OCV value, the second OCV value, and a linear inner difference method.
8. The apparatus of claim 5, wherein the first ratio value is determined by:
wherein Rs represents a first ratio value, V1 and V2 represent OCV values corresponding to SOC values at both ends of the current interval, respectively, and SOC2 and SOC1 represent SOC values at both ends of the current interval corresponding to the current SOC values obtained from the OCV table, respectively;
determining a second ratio value by:
wherein Rn respectively represents a second ratio value, Vn represents the current OCV value, and SOCn represents the current SOC value.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the steps of the method of any of the preceding claims 1 to 4 are implemented when the computer program is executed by the processor.
10. A computer-readable medium having non-volatile program code executable by a processor, wherein the program code causes the processor to perform the method of any of claims 1 to 4.
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Application publication date: 20200602 Assignee: Shenzhen tianbangda New Energy Technology Co.,Ltd. Assignor: SHENZHEN TIANBANGDA TECHNOLOGY Co.,Ltd. Contract record no.: X2023980037765 Denomination of invention: Polarization state discrimination method, device and electronic equipment of Lithium iron phosphate battery Granted publication date: 20220809 License type: Common License Record date: 20230707 |