CN114217237A - Battery health state determination method and device based on storage endurance and electronic equipment - Google Patents
Battery health state determination method and device based on storage endurance and electronic equipment Download PDFInfo
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- CN114217237A CN114217237A CN202111307808.0A CN202111307808A CN114217237A CN 114217237 A CN114217237 A CN 114217237A CN 202111307808 A CN202111307808 A CN 202111307808A CN 114217237 A CN114217237 A CN 114217237A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
Abstract
The invention provides a method and a device for determining the state of health of a battery based on storage durability and electronic equipment, wherein the method comprises the following steps: acquiring the electrochemical coefficient, the ambient temperature and the accumulated storage time of the current battery; determining the capacity decrement of the current battery under the storage working condition through the electrochemical coefficient, the ambient temperature and the accumulated storage time; and determining the battery health state of the current battery under the influence of the storage endurance based on the capacity attenuation amount, and accurately determining the battery health state through the influence of the storage endurance on the battery capacity attenuation.
Description
Technical Field
The invention relates to the technical field of battery state monitoring, in particular to a battery state of health determination method and device based on storage durability and electronic equipment.
Background
The SOH of the battery is one hundred percent (the best state) before the whole vehicle runs at present, and in the use process, the SOH of the battery is reduced along with the increase of the charging and discharging times.
For the whole vehicle, the state of health SOH of the battery is a relatively important battery parameter, and if the battery state of the vehicle is abnormal, the safety and reliability of the vehicle during running or charging and discharging are relatively poor. Therefore, how to accurately determine the state of health SOH of the battery is a technical problem which needs to be solved urgently.
Disclosure of Invention
In view of the above, the present invention provides a method, an apparatus and an electronic device for determining a state of health of a battery based on storage endurance, which accurately determine the state of health of the battery by the influence of storage endurance on the capacity attenuation of the battery, so as to solve the above technical problems.
In a first aspect, an embodiment provides a battery state of health determination method based on storage endurance, the method including:
acquiring the electrochemical coefficient, the ambient temperature and the accumulated storage time of the current battery;
determining the capacity decrement of the current battery under the storage working condition according to the electrochemical coefficient, the ambient temperature and the accumulated storage time;
determining a current battery state of health under the influence of storage endurance based on the capacity fade amount.
In an alternative embodiment, the step of determining the capacity fade amount of the current battery under the storage condition according to the electrochemical coefficient, the ambient temperature and the accumulated storage time includes:
and determining the capacity decrement of the current battery under the storage working condition based on the product of a first test calibration coefficient, an exponential function, the accumulated storage time and the state of charge of the battery, wherein the exponential function takes a natural constant e as a base and the ratio of the electrochemical coefficient to the ambient temperature as an index.
In an alternative embodiment, the rate of decay of the capacity fade is exponential with the battery state of charge.
In an optional embodiment, the step of determining the capacity decrement of the current battery under the storage condition based on the product of the first test calibration coefficient, the exponential function, the accumulated storage time and the state of charge of the battery includes:
the capacity attenuation amount of the current battery under the storage working condition is determined through the following formula:
wherein Q isCalenderIs the capacity attenuation, B is the first test calibration coefficient, Ea2Is the electrochemical coefficient, T is the ambient temperature, SOC is the battery state of charge, n is the second test calibration coefficient, and Hour is the cumulative storage time.
In an alternative embodiment, the method further comprises:
and determining the first test calibration coefficient, the second test calibration coefficient and the electrochemical coefficient by performing storage endurance tests on the electric core of the current battery under various preset temperature conditions.
In an alternative embodiment, the step of determining the current battery state of health under the influence of storage endurance based on the capacity fade amount comprises:
determining a battery state of health of the current battery under the influence of storage endurance based on a difference between the initial capacity of the current battery and the capacity fade amount.
In an alternative embodiment, the method further comprises:
acquiring the actual attenuation amount of the current battery;
and performing durability check according to a comparison result of the difference between the capacity attenuation of the current battery and the actual attenuation and a preset matching difference.
In a second aspect, an embodiment provides a storage endurance-based battery state of health determination apparatus, the apparatus comprising:
the acquisition module is used for acquiring the electrochemical coefficient, the ambient temperature and the accumulated storage time of the current battery;
the first determining module is used for determining the capacity decrement of the current battery under the storage working condition according to the electrochemical coefficient, the ambient temperature and the accumulated storage time;
and the second determination module is used for determining the battery health state of the current battery under the influence of the storage endurance based on the capacity fading quantity.
In a third aspect, an embodiment provides an electronic device, including a memory and a processor, where the memory stores a computer program operable on the processor, and the processor implements the steps of the method described in any one of the foregoing embodiments when executing the computer program.
In a fourth aspect, embodiments provide a machine-readable storage medium having stored thereon machine-executable instructions that, when invoked and executed by a processor, cause the processor to carry out the steps of the method of any preceding embodiment.
According to the method and the device for determining the battery health state based on the storage endurance and the electronic equipment, the influence of the storage working condition on the battery capacity attenuation under the condition can be determined according to the electrochemical coefficient, the ambient temperature and the accumulated storage time of the current battery, and the battery health state under the influence of the storage endurance can be further accurately determined.
Additional features and advantages of the disclosure will be set forth in the description which follows, or in part may be learned by the practice of the above-described techniques of the disclosure, or may be learned by practice of the disclosure.
In order to make the aforementioned objects, features and advantages of the present disclosure more comprehensible, preferred embodiments accompanied with figures are described in detail below.
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 flow chart of a method for determining a state of health of a battery based on storage endurance according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a fitting check of battery capacity fade according to an embodiment of the present invention;
FIG. 3 is a functional block diagram of a battery health status determination apparatus based on memory endurance according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a hardware architecture of an electronic device according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present 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.
The inventor researches and discovers that storage durability under the storage working condition has influence on the battery health state, and in order to accurately determine the battery health state, the influence of the working condition on the battery health state needs to be considered.
Based on the above, the method, the device and the electronic equipment for determining the battery health state based on the storage endurance provided by the embodiment of the invention can accurately determine the battery health state through the influence of the storage endurance on the battery capacity attenuation.
For the convenience of understanding the present embodiment, a method for determining the state of health of a battery based on storage endurance, which is disclosed in the present embodiment, will be described in detail first.
Fig. 1 is a flowchart of a method for determining a state of health of a battery based on storage endurance according to an embodiment of the present invention.
As shown in fig. 1, the method comprises the steps of:
step S102, acquiring the electrochemical coefficient, the ambient temperature and the accumulated storage time of the current battery.
The electrochemical coefficient is a dimensionless parameter representing the influence degree of potential (overpotential) on the activation energy of cathode reaction and anode reaction, and is related to the material of the current battery cell; the environment temperature is the temperature of the test environment where the current battery is located; the accumulated storage time is the time for which the current battery is standing in the current testing environment.
And step S104, determining the capacity decrement of the current battery under the storage working condition according to the electrochemical coefficient, the ambient temperature and the accumulated storage time.
Here, the inventors have found that the influence of the storage condition under such conditions on the battery capacity, that is, the capacity fade amount, can be determined based on the current electrochemical coefficient of the battery, the ambient temperature, and the accumulated storage time.
And step S106, determining the battery health state of the current battery under the influence of the storage durability based on the capacity attenuation amount.
Among them, the state of health SOH and the capacity retention rate of the battery under the influence of the storage durability can be obtained from the capacity fade amount obtained as described above.
In a practical preferred embodiment, the influence of the storage working condition under the condition on the battery capacity attenuation can be determined according to the current electrochemical coefficient, the ambient temperature and the accumulated storage time of the battery, and the health state of the battery under the influence of the storage durability can be further accurately determined.
In some embodiments, after the inventor' S research on the resistance change and capacity fade of the battery during the storage process, the step S104 may include:
step 1.1) determining the capacity decrement of the current battery under the storage working condition based on the product of a first test calibration coefficient, an exponential function, the accumulated storage time and the state of charge of the battery, wherein the exponential function takes a natural constant e as a base and takes the ratio of the electrochemical coefficient to the ambient temperature as an index.
The test calibration coefficient is a coefficient obtained by calibrating the current battery in the test process by a user in advance and is used for calculating the health state of the subsequent battery.
Note that the rate of decay of the capacity fade amount is exponential to the battery state of charge.
In some embodiments, the determination of the capacity fade of the current battery under storage conditions is achieved by the following equation:
wherein Q isCalenderIs the capacity attenuation, B is the first test calibration coefficient, Ea2Is the electrochemical coefficient, T is the ambient temperature, SOC is the battery state of charge, n is the second test calibration coefficient, and Hour is the cumulative storage time.
In the actual storage process, the reasons for capacity fade are: consumption due to a side reaction of lithium in the negative electrode with the electrolyte is represented by the following formula:
C6Li+Electrolyte→SEI
wherein, C6Li is a graphite intercalation compound formed by lithium atoms intercalation, electroyte is an Electrolyte, and SEI (solid Electrolyte interface) is a solid Electrolyte interface film, also called SEI film.
From the chemical reaction kinetics, the reaction rate k is exponentially related to the lithium concentration in the negative electrode, as shown in the following formula:
whereas according to the definition of the state of charge SOC of the battery (where SOC may represent the remaining charge, i.e. the amount of lithium transferable in the negative electrode), i.e. SOC has a positive correlation with the concentration of lithium in the negative electrode:
thus, the following formula can be derived:
k∝SOCn
i.e., the rate of capacity fade during storage is exponential to the storage SOC.
In some embodiments, to further ensure the accuracy of the battery state of health determination, the method further comprises:
and 2.1) determining the first test calibration coefficient, the second test calibration coefficient and the electrochemical coefficient by performing storage endurance tests on the battery core of the current battery under various preset temperature conditions.
For example, the storage endurance test was performed on the cells at the ambient temperatures of 25 ℃ and 55 ℃, respectively, and the capacity was recovered every 30 days from the SOC of one hundred percent of the battery, to obtain B17870, Ea2-5345, n-1.086. The parameters are obtained by fitting and analyzing polynomial data (battery capacity and battery discharge end temperature) through MATLAB, and the fitting and analyzing mode comprises polynomial fitting polynimial, Gaussian fitting gaussian, power index fitting power and the like.
In some embodiments, step S106 may also be implemented by steps comprising:
step 3.1), determining the battery health state of the current battery under the influence of storage durability based on the difference between the initial capacity of the current battery and the capacity decrement, which can be specifically realized according to the following formula:
SOH＝SOH0-QCalender
wherein, SOH0For the initial capacity of the current battery, SOH is the current battery state of health, Q, of the current batteryCalenderThe capacity fade under the influence of the storage endurance is used.
In some embodiments, the battery state of health may be matched by collecting actual battery degradation and determining battery state of health in the manner of the present application to ensure accuracy of the battery state of health, the method further comprising:
and 4.1) acquiring the actual attenuation of the current battery.
Wherein, instruments such as sensing equipment can be adopted to accurately detect the actual value of the attenuation of the battery.
And 4.2) performing durability check according to a comparison result of the difference value between the capacity attenuation amount of the current battery and the actual attenuation amount and a preset matching difference value.
As shown in fig. 2, the fit lines 1, 2, and 3 are generated for the capacity attenuation of the current battery under three different conditions, and the matching degree between the actual attenuation in a dotted shape and the simulated capacity attenuation fit line is high in each condition.
As an alternative example, it can be seen from the above formula that the higher the temperature, the faster the battery capacity decays, and the temperature condition of a region with higher temperature can be selected as the evaluation conditions of the real machine durability, such as cantonese, the annual average temperature of 23.78 ℃, the annual maximum temperature of 34 ℃, and the annual minimum temperature of 10 ℃. (25. + -. 2 ℃) standard charging was carried out. It should be noted that the battery state of health determined in the foregoing embodiment is a battery state affected by the storage conditions of the test temperature and the storage time, and in the actual battery state of health monitoring or testing process, it is often necessary to determine the battery state of health under the storage conditions of multiple temperatures or multiple storage times, that is, it is necessary to repeat the processes of S102 to S106 in the foregoing embodiment steps for multiple times.
For example, the battery pack is left at 45 ℃ for 720h (storage time), taken out and returned to normal temperature, the above process is cycled for 8 times, wherein a standard discharge-standard charge cycle is performed twice per cycle, and the capacity decrement and the capacity retention rate of the battery at the moment are detected and recorded by using a sensing device.
As shown in fig. 3, an embodiment of the present invention further provides a device 200 for determining a state of health of a battery based on storage endurance, the device including:
an obtaining module 201, configured to obtain an electrochemical coefficient, an ambient temperature, and an accumulated storage time of a current battery;
the first determining module 202 is used for determining the capacity decrement of the current battery under the storage working condition according to the electrochemical coefficient, the ambient temperature and the accumulated storage time;
and the second determination module 203 determines the battery health state of the current battery under the influence of the storage endurance based on the capacity fading amount.
Fig. 4 is a schematic hardware architecture diagram of an electronic device 300 according to an embodiment of the present invention. Referring to fig. 4, the electronic device 300 includes: a machine-readable storage medium 301 and a processor 302, and may further include a non-volatile storage medium 303, a communication interface 304, and a bus 305; among other things, the machine-readable storage medium 301, the processor 302, the non-volatile storage medium 303, and the communication interface 304 communicate with each other via a bus 305. The processor 302 may perform the method of determining a state of health of a battery based on storage endurance described in the above embodiments by reading and executing machine executable instructions in the machine readable storage medium 301 determined based on a state of health of a battery based on storage endurance.
A machine-readable storage medium as referred to herein may be any electronic, magnetic, optical, or other physical storage device that can contain or store information such as executable instructions, data, and the like. For example, the machine-readable storage medium may be: a RAM (random Access Memory), a volatile Memory, a non-volatile Memory, a flash Memory, a storage drive (e.g., a hard drive), any type of storage disk (e.g., an optical disk, a dvd, etc.), or similar storage medium, or a combination thereof.
The non-volatile medium may be non-volatile memory, flash memory, a storage drive (e.g., a hard drive), any type of storage disk (e.g., an optical disk, dvd, etc.), or similar non-volatile storage medium, or a combination thereof.
It can be understood that, for the specific operation method of each functional module in this embodiment, reference may be made to the detailed description of the corresponding step in the foregoing method embodiment, and no repeated description is provided herein.
The computer-readable storage medium provided in the embodiments of the present invention stores a computer program therein, and when executed, the computer program code may implement the method for determining a state of health of a battery based on storage endurance according to any of the embodiments described above, and for specific implementation, reference may be made to the method embodiments, and details are not repeated here.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the system and the apparatus described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein.
Claims (10)
1. A method for determining a state of health of a battery based on storage endurance, the method comprising:
acquiring the electrochemical coefficient, the ambient temperature and the accumulated storage time of the current battery;
determining the capacity decrement of the current battery under the storage working condition according to the electrochemical coefficient, the ambient temperature and the accumulated storage time;
determining a current battery state of health under the influence of storage endurance based on the capacity fade amount.
2. The method of claim 1, wherein determining the amount of capacity fade of the current battery under storage conditions from the electrochemical coefficient, the ambient temperature, and the accumulated storage time comprises:
and determining the capacity decrement of the current battery under the storage working condition based on the product of a first test calibration coefficient, an exponential function, the accumulated storage time and the state of charge of the battery, wherein the exponential function takes a natural constant e as a base and the ratio of the electrochemical coefficient to the ambient temperature as an index.
3. The method of claim 2, wherein a decay rate of the capacity fade is exponential with the battery state of charge.
4. The method of claim 2 or 3, wherein the step of determining the capacity fade of the current battery under storage conditions based on the product of a first test calibration factor, an exponential function, the accumulated storage time, and a battery state of charge comprises:
the capacity attenuation amount of the current battery under the storage working condition is determined through the following formula:
wherein Q isCalenderIs the capacity attenuation, B is the first test calibration coefficient, Ea2Is the electrochemical coefficient, T is the ambient temperature, SOC is the battery state of charge, n is the second test calibration coefficient, and Hour is the cumulative storage time.
5. The method of claim 4, further comprising:
and determining the first test calibration coefficient, the second test calibration coefficient and the electrochemical coefficient by performing storage endurance tests on the electric core of the current battery under various preset temperature conditions.
6. The method of claim 1, wherein determining the current battery state of health under the influence of storage endurance based on the capacity fade comprises:
determining a battery state of health of the current battery under the influence of storage endurance based on a difference between the initial capacity of the current battery and the capacity fade amount.
7. The method of claim 1, further comprising:
acquiring the actual attenuation amount of the current battery;
and performing durability check according to a comparison result of the difference between the capacity attenuation of the current battery and the actual attenuation and a preset matching difference.
8. A storage-endurance-based battery state of health determining apparatus, the apparatus comprising:
the acquisition module is used for acquiring the electrochemical coefficient, the ambient temperature and the accumulated storage time of the current battery;
the first determining module is used for determining the capacity decrement of the current battery under the storage working condition according to the electrochemical coefficient, the ambient temperature and the accumulated storage time;
and the second determination module is used for determining the battery health state of the current battery under the influence of the storage endurance based on the capacity fading quantity.
9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program operable on the processor, and wherein the processor implements the steps of the method of any of claims 1 to 7 when executing the computer program.
10. A machine-readable storage medium having stored thereon machine-executable instructions which, when invoked and executed by a processor, cause the processor to carry out the steps of the method of any one of claims 1 to 7.
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