CN115436825A - Method, device and equipment for detecting abnormal state of single battery cell and storage medium - Google Patents
Method, device and equipment for detecting abnormal state of single battery cell and storage medium Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
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Abstract
The disclosure relates to a method, a device, equipment and a storage medium for detecting abnormal states of single battery cells. According to the battery system, after the first charging is carried out on the battery system, first voltage data of each monomer battery cell in a plurality of monomer battery cells under a target SOC are obtained, after the second charging is carried out on the battery system, second voltage data of each monomer battery cell in the plurality of monomer battery cells under the target SOC are obtained, and the monomer battery cells in abnormal states are detected based on the first voltage data of each monomer battery cell in the plurality of monomer battery cells and the second voltage data of each monomer battery cell in the plurality of monomer battery cells. Due to the fact that the two times of voltage data of each single battery cell in the plurality of single battery cells under the target SOC are obtained, the change rate of the voltage data represents the self-discharge rate, and the single battery cells in the self-discharge abnormal state can be detected through the comparison of the two times of voltage data, so that the accurate replacement of the single battery cells is achieved, and the safety and the cruising ability of the electric automobile are improved.
Description
Technical Field
The present disclosure relates to the field of electric vehicles, and in particular, to a method, an apparatus, a device, and a storage medium for detecting abnormal states of a cell.
Background
With the rapid development of the electric automobile industry, the holding capacity of the electric automobile is higher and higher, and the safety of the battery system as an important part of the electric automobile is particularly important.
With the arrival of the communication and cloud big data era, the data circulation becomes abnormal and frequent, and the data volume is increasing. For the electric automobile, a large amount of original data are generated in the vehicle charging and driving processes, so that a designer can monitor the safety state of a battery system, and for the signal of the battery system, the cell voltage data is used as an index directly reflecting the cell running state, so that the research and classification early warning of the cell voltage data are particularly important.
At present, whether the battery has an abnormal fault or not can be directly judged by acquiring external characteristics such as voltage, current and temperature of each battery pack or each battery cell in a battery system through a sensor, but the self-discharge abnormality of the battery cells cannot be detected, so that the maintenance of the battery pack can only adopt a whole-pack replacement mode, the accurate maintenance cannot be carried out, and the driving safety of the electric automobile is greatly influenced.
Disclosure of Invention
In order to solve the technical problem, the present disclosure provides a method, an apparatus, a device, and a storage medium for detecting an abnormal state of a single battery cell, which can detect a self-discharge abnormality of the single battery cell, thereby implementing accurate replacement of the single battery cell and improving the safety of an electric vehicle.
In a first aspect, an embodiment of the present disclosure provides a method for detecting abnormal states of individual electric cores, where a battery system includes a plurality of individual electric cores, and the method includes:
after the battery system is charged for the first time, obtaining first voltage data of each single battery cell in the plurality of single battery cells under a target SOC;
after the battery system is charged for the second time, second voltage data of each single battery cell in the plurality of single battery cells under the target SOC are obtained;
detecting the individual electric core with an abnormal state based on the first voltage data of each of the plurality of individual electric cores and the second voltage data of each of the plurality of individual electric cores.
In some embodiments, before the obtaining the first voltage data of each of the plurality of individual cells at the target SOC, the method further includes: after the battery system is charged for the first time, controlling the SOC of each single battery cell in the plurality of single battery cells to be a target SOC;
prior to the obtaining second voltage data for each of the plurality of individual cells at the target SOC, the method further includes: and after the battery system is charged for the second time, controlling the SOC of each single battery cell in the plurality of single battery cells to be the target SOC.
In some embodiments, the detecting, based on the first voltage data of each of the plurality of individual cells and the second voltage data of each of the plurality of individual cells, an individual cell in which an abnormal state exists includes:
determining information, corresponding to each of the plurality of monomer cells, for characterizing a self-discharge rate based on the first voltage data of each of the plurality of monomer cells and the second voltage data of each of the plurality of monomer cells;
and detecting the monomer battery cell in the self-discharge abnormal state based on the information for representing the size of the self-discharge rate.
In some embodiments, the determining, based on the first voltage data of each of the plurality of individual cells and the second voltage data of each of the plurality of individual cells, information for characterizing a magnitude of a self-discharge rate for each of the plurality of individual cells includes:
sequencing the first voltage data of each of the plurality of monomer battery cells to obtain first voltage sequencing information of each of the plurality of monomer battery cells;
sorting the second voltage data of each of the plurality of monomer battery cells to obtain second voltage sorting information of each of the plurality of monomer battery cells;
determining, based on the first voltage sequencing information and the second voltage sequencing information, sequencing change information corresponding to each of the plurality of individual battery cells, where the sequencing change information is information used for representing a self-discharge rate.
In some embodiments, the detecting, based on the information characterizing the magnitude of the self-discharge rate, a cell in which a self-discharge abnormal state exists includes:
judging whether the sorting change information is larger than or equal to a preset sorting change threshold value;
and if the sorting change information is greater than or equal to a preset sorting change threshold, determining that the self-discharge abnormal state exists in the single battery cell of which the sorting change information is greater than or equal to the preset sorting change threshold.
In some embodiments, the method further comprises:
and after detecting that the single battery cell in the abnormal state exists, carrying out replacement early warning on the single battery cell.
In a second aspect, an embodiment of the present disclosure provides a device for detecting abnormal states of battery cells, where a battery system includes a plurality of battery cells, and the device includes:
the first obtaining module is used for obtaining first voltage data of each single battery cell in the plurality of single battery cells under a target SOC after the first charging of the battery system is carried out;
a second obtaining module, configured to obtain second voltage data of each cell in the plurality of cell cores under the target SOC after second charging of the battery system is performed;
the detection module is configured to detect a single battery cell in an abnormal state based on the first voltage data of each of the plurality of single battery cells and the second voltage data of each of the plurality of single battery cells.
In some embodiments, the apparatus further comprises:
the first control module is used for controlling the SOC of each single battery cell in the plurality of single battery cells to be a target SOC after the first charging of the battery system is carried out;
and the second control module is used for controlling the SOC of each single battery cell in the plurality of single battery cells to be the target SOC after the second charging of the battery system is carried out.
In some embodiments, the detection module comprises a determination unit and a detection unit;
a determining unit, configured to determine, based on the first voltage data of each of the plurality of individual battery cells and the second voltage data of each of the plurality of individual battery cells, information corresponding to each of the plurality of individual battery cells and used for characterizing a self-discharge rate;
and the detection unit is used for detecting the monomer battery cell in the self-discharge abnormal state based on the information for representing the size of the self-discharge rate.
In some embodiments, when determining, based on the first voltage data of each of the plurality of individual cells and the second voltage data of each of the plurality of individual cells, the information characterizing the self-discharge rate of each of the plurality of individual cells, the determining unit is specifically configured to:
sequencing the first voltage data of each of the plurality of monomer battery cells to obtain first voltage sequencing information of each of the plurality of monomer battery cells;
sorting the second voltage data of each of the plurality of monomer battery cells to obtain second voltage sorting information of each of the plurality of monomer battery cells;
determining sorting change information corresponding to each of the plurality of single battery cells based on the first voltage sorting information and the second voltage sorting information, wherein the sorting change information is used for representing the size of the self-discharge rate.
In some embodiments, when the detecting unit detects a single cell in a self-discharge abnormal state based on the information representing the magnitude of the self-discharge rate, the detecting unit is specifically configured to:
judging whether the sorting change information is larger than or equal to a preset sorting change threshold value;
and if the sequencing change information is greater than or equal to a preset sequencing change threshold, determining that the corresponding single battery cell has a self-discharge abnormal state.
In some embodiments, the apparatus further comprises:
and the early warning module is used for carrying out replacement early warning on the single battery cell after the single battery cell in the abnormal state is detected.
In a third aspect, an embodiment of the present disclosure provides an electronic device, including:
a memory;
a processor; and
a computer program;
wherein the computer program is stored in the memory and configured to be executed by the processor to implement the method of the first aspect.
In a fourth aspect, the present disclosure provides a computer-readable storage medium, on which a computer program is stored, the computer program being executed by a processor to implement the method of the first aspect.
In a fifth aspect, an embodiment of the present disclosure further provides a computer program product, where the computer program product includes a computer program or an instruction, and when the computer program or the instruction is executed by a processor, the method for detecting an abnormal state of a single battery cell as described above is implemented.
According to the method, the device, the equipment and the storage medium for detecting the abnormal state of the single battery cell, after the battery system is charged for the first time, first voltage data of each single battery cell in the plurality of single battery cells under the target SOC are obtained, after the battery system is charged for the second time, second voltage data of each single battery cell in the plurality of single battery cells under the target SOC are obtained, and the single battery cell with the abnormal state is detected based on the first voltage data of each single battery cell in the plurality of single battery cells and the second voltage data of each single battery cell in the plurality of single battery cells. The method comprises the steps of obtaining two times of voltage data of each monomer battery cell in a plurality of monomer battery cells under a target SOC, unifying the SOC of the monomer battery cells to control variables, enabling other variables of the two times of voltage data of the monomer battery cells to be the same, enabling the only variable to be the self-discharge rate, and under the normal condition, enabling the self-discharge rate of the same monomer battery cell in the two times of voltage data to fluctuate within a small range, wherein the change rate of the voltage data represents the self-discharge rate.
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The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a flowchart of a method for detecting an abnormal state of a single battery cell according to an embodiment of the present disclosure;
fig. 2 is a flowchart of a method for detecting an abnormal state of a single battery cell according to another embodiment of the present disclosure;
fig. 3 is a flowchart of a method for detecting an abnormal state of a cell core according to another embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a single battery cell abnormal state detection apparatus provided in the embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments. The specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
The embodiment of the present disclosure provides a method for detecting an abnormal state of a single battery cell, which is described below with reference to specific embodiments.
Fig. 1 is a flowchart of a method for detecting an abnormal state of a single battery cell according to an embodiment of the present disclosure. The method can be applied to an application scene for detecting the state of a battery system of the electric automobile, and can detect the self-discharge abnormity of the single battery cell, thereby realizing the accurate replacement of the single battery cell and improving the safety of the electric automobile. It can be understood that the method for detecting the abnormal state of the single battery cell provided by the embodiment of the disclosure can also be applied to other scenes.
The method for detecting abnormal states of individual battery cells shown in fig. 1 is described below, where a battery system includes a plurality of individual battery cells, and the method includes the following specific steps:
s101, after the battery system is charged for the first time, first voltage data of each single battery cell in the plurality of single battery cells under the target SOC are obtained.
Optionally, the cloud server receives vehicle original data uploaded by a vehicle Controller Area Network (CAN) bus, the vehicle original data at least comprise charging data, voltage monitoring data of each monomer battery cell in the case of no load current and voltage monitoring data of each monomer battery cell in the case of load current, and data cleaning operations such as null value elimination and repeated value elimination are performed on the vehicle original data. The cloud obtains first voltage data of each single battery cell in the plurality of single battery cells, which are subjected to first charging on the battery system, under the target SOC from the cleaned data. The SOC is a percentage of a current amount of charge stored in the individual electric core, and the first voltage data is data before driving after the first charge equalization processing, that is, the first voltage data is data monitored when no load current exists.
And S102, after the battery system is charged for the second time, obtaining second voltage data of each single battery cell in the plurality of single battery cells under the target SOC.
The principle and implementation process of this step are similar to those of S101, and are not described herein again. The purpose of unifying the SOC of the individual battery cells is to control variables, only voltage differences of the individual battery cells due to different self-discharge rates are considered, the second voltage data is data before driving after the second charge equalization processing, that is, the first voltage data is data monitored when no load current exists. In some embodiments, the two equalization processes may be two adjacent equalization processes, or two non-adjacent equalization processes, which is not limited in particular. In some embodiments, the equalization process is performed every two days, and the interval time may be set by itself, which is not limited herein.
S103, detecting the single battery cell in an abnormal state based on the first voltage data of each single battery cell in the plurality of single battery cells and the second voltage data of each single battery cell in the plurality of single battery cells.
After the first voltage data of each of the plurality of monomer battery cells and the second voltage data of each of the plurality of monomer battery cells are obtained, based on the first voltage data of each of the plurality of monomer battery cells and the second voltage data of each of the plurality of monomer battery cells, the purpose of unifying the SOCs of the monomer battery cells is to control variables, only voltage differences of the monomer battery cells due to different self-discharge rates are considered, since other variables of the two times of voltage data are the same and the only variable is the self-discharge rate, the ranking of the two times of voltage data of the same monomer battery cell should fluctuate within a small range, and the monomer battery cells in an abnormal self-discharge state can be detected by comparing the two times of voltage data.
According to the embodiment of the disclosure, after the first charging is performed on the battery system, the first voltage data of each monomer battery cell in the plurality of monomer battery cells under the target SOC is obtained, after the second charging is performed on the battery system, the second voltage data of each monomer battery cell in the plurality of monomer battery cells under the target SOC is obtained, and the monomer battery cells in the abnormal state are detected based on the first voltage data of each monomer battery cell in the plurality of monomer battery cells and the second voltage data of each monomer battery cell in the plurality of monomer battery cells. Because the two-time voltage data of each single battery cell in the plurality of single battery cells under the target SOC are obtained, the purpose of unifying the SOC of the single battery cells is to control the variable, other variables of the two-time voltage data of the single battery cells are the same, the only variable is the self-discharge rate, under the normal condition, the self-discharge rate of the same single battery cell in the two-time voltage data can fluctuate within a very small range, and through the comparison of the two-time voltage data, the single battery cell with the self-discharge abnormal state can be detected, so that the accurate replacement of the single battery cell is realized, and the safety and the cruising ability of the electric automobile are improved.
Fig. 2 is a flowchart of a method for detecting an abnormal state of a single battery cell according to another embodiment of the present disclosure, and as shown in fig. 2, the method includes the following steps:
s201, after the battery system is charged for the first time, controlling the SOC of each of the plurality of single battery cells to be a target SOC, and obtaining first voltage data of each of the plurality of single battery cells under the target SOC.
For example, after the first charging of the battery system, in order to ensure the SOC uniformity between the unit cells, the SOC of each of the plurality of unit cells may be controlled to be the target SOC. The specific implementation mode is battery equalization, wherein the battery equalization refers to a process of discharging parallel internal resistance of some monomer battery cells with overhigh SOC at the charging end of a battery so that all the monomer battery cells reach a uniform SOC value. After the SOC of each monomer battery cell in the monomer battery cells is controlled to be a target SOC, first voltage data of each monomer battery cell in the monomer battery cells under the target SOC are obtained, the SOC refers to the percentage of the current stored charge amount of the monomer battery cells, the first voltage data is data before driving after the first charge equalization processing, and the data monitored before the driving, namely when no load current exists, is obtained.
And S202, after the battery system is charged for the second time, controlling the SOC of each of the plurality of single battery cells to be a target SOC, and obtaining second voltage data of each of the plurality of single battery cells under the target SOC.
For example, after the battery system is charged for the second time, in order to ensure the SOC uniformity among the unit cells, the SOC of each of the plurality of unit cells is controlled to be the target SOC. The specific implementation mode is battery equalization, wherein the battery equalization refers to a process of discharging parallel internal resistance of some monomer battery cells with overhigh SOC at the charging end of a battery so that all the monomer battery cells reach a uniform SOC value. After the SOC of each monomer battery cell in the monomer battery cells is controlled to be the target SOC, second voltage data of each monomer battery cell in the monomer battery cells under the target SOC are obtained, the SOC refers to the percentage of the current stored charge amount of the monomer battery cells, the second voltage data is data before driving after the second charge equalization processing, and the data monitored before the driving, namely when no load current exists, is obtained.
S203, determining information which corresponds to each single battery cell in the plurality of single battery cells and is used for representing the self-discharge rate based on the first voltage data of each single battery cell in the plurality of single battery cells and the second voltage data of each single battery cell in the plurality of single battery cells.
Optionally, after the SOC of each of the plurality of unified battery cells reaches the target SOC, the purpose of unifying the SOC of the battery cells is to control the variable, only the voltage difference of the battery cells due to the different self-discharge rates is considered, and since other variables of the voltage data of the two times are the same, the only variable is the self-discharge rate. Therefore, based on the first voltage data of each of the plurality of individual cells and the second voltage data of each of the plurality of individual cells, information for characterizing the magnitude of the self-discharge rate corresponding to each of the plurality of individual cells may be determined.
And S204, detecting the single battery cell in the self-discharge abnormal state based on the information for representing the self-discharge rate.
For the same single cell, the information used for representing the size of the self-discharge rate in the obtained two voltage data is approximately the same, and the single cell with the larger change of the information representing the size of the self-discharge rate can be determined by comparing the information used for representing the size of the self-discharge rate in the two voltage data of the same single cell, so that the self-discharge abnormality exists.
In the embodiment of the disclosure, after the first charging is performed on the battery system, the SOC of each of the plurality of cell cores is controlled to be the target SOC, so as to obtain the first voltage data of each of the plurality of cell cores under the target SOC, and after the second charging is performed on the battery system, the SOC of each of the plurality of cell cores is controlled to be the target SOC, so as to obtain the second voltage data of each of the plurality of cell cores under the target SOC. Further, based on the first voltage data of each of the plurality of monomer cells and the second voltage data of each of the plurality of monomer cells, determining information, corresponding to each of the plurality of monomer cells, for characterizing a self-discharge rate, and based on the information for characterizing the self-discharge rate, detecting the monomer cells in the self-discharge abnormal state. After the SOC is unified, under the normal condition, for the same single battery cell, the information used for representing the size of the self-discharge rate in the obtained two times of voltage data is approximately the same, the single battery cell with the larger information change of the size of the self-discharge rate can be determined by comparing the information used for representing the size of the self-discharge rate in the two times of voltage data of the same single battery cell, the self-discharge abnormity exists, so that the single battery cell with the self-discharge abnormity is detected, the accurate replacement is realized, the maintenance of a battery system is facilitated, and the cruising ability of the battery system is better ensured.
Fig. 3 is a flowchart of a method for detecting an abnormal state of a single battery cell according to another embodiment of the present disclosure, and as shown in fig. 3, the method includes the following steps:
s301, after the battery system is charged for the first time, controlling the SOC of each of the plurality of single battery cells to be a target SOC, and obtaining first voltage data of each of the plurality of single battery cells under the target SOC.
Specifically, the implementation process and principle of S301 and S201 are consistent, and are not described herein again.
And S302, after the battery system is charged for the second time, controlling the SOC of each of the plurality of single battery cells to be a target SOC, and obtaining second voltage data of each of the plurality of single battery cells under the target SOC.
Specifically, the implementation process and principle of S302 and S202 are consistent, and are not described herein again.
S303, sequencing the first voltage data of each of the plurality of single battery cells to obtain first voltage sequencing information of each of the plurality of single battery cells.
After the first voltage data are obtained, the cloud server sorts the first voltage data of each single battery cell in the multiple single battery cells to obtain first voltage sorting information of each single battery cell in the multiple single battery cells. Through the first voltage sequencing information, the voltage change condition of each single battery cell, namely the self-discharge rate of each single battery cell, can be clearly seen.
S304, sorting the second voltage data of each of the plurality of single battery cells to obtain second voltage sorting information of each of the plurality of single battery cells.
After the second voltage data is obtained, the cloud server sorts the second voltage data of each of the plurality of single battery cells to obtain second voltage sorting information of each of the plurality of single battery cells. Through the second voltage sequencing information, the voltage change condition of each single battery cell, that is, the self-discharge rate of each single battery cell can be clearly seen.
And S305, determining respective corresponding sequencing change information of each single battery cell in the plurality of single battery cells based on the first voltage sequencing information and the second voltage sequencing information.
And determining sequencing change information corresponding to each single battery cell in the plurality of single battery cells based on the first voltage sequencing information and the second voltage sequencing information, so that the self-discharge rate change condition of each single battery cell can be determined, wherein the sequencing change information is information for representing the self-discharge rate.
S306, judging whether the sorting change information is larger than or equal to a preset sorting change threshold value, if so, executing S307, and otherwise, executing S308.
After determining the ranking change information corresponding to each of the plurality of individual battery cells, judging whether the ranking change information is greater than or equal to a preset ranking change threshold, and if the ranking change information is greater than or equal to the preset ranking change threshold, performing steps S307 and S307; if the rank change information is less than the preset rank change threshold, S308 is performed. And determining the single battery cell with larger sequencing change information, namely the single battery cell with abnormal self-discharge rate.
And S307, determining that the single battery cell has self-discharge abnormity.
And if the sequencing change information is greater than or equal to a preset sequencing change threshold value, determining that the single battery cell has self-discharge abnormity.
And S308, after detecting that the single battery cell in an abnormal state exists, carrying out replacement early warning on the single battery cell.
Optionally, after the single battery cell in an abnormal state is detected, the replacement of the single battery cell is early warned. For example, a message prompt is sent to the user, an abnormal single battery cell is replaced in time, and the cruising ability of the electric automobile is ensured.
And S309, ending.
In the embodiment of the disclosure, after the first charging is performed on the battery system, the SOC of each of the plurality of cell cores is controlled to be the target SOC, the first voltage data of each of the plurality of cell cores under the target SOC is obtained, after the second charging is performed on the battery system, the SOC of each of the plurality of cell cores is controlled to be the target SOC, the second voltage data of each of the plurality of cell cores under the target SOC is obtained, the first voltage data of each of the plurality of cell cores is sorted, the first voltage sorting information of each of the plurality of cell cores is obtained, the second voltage data of each of the plurality of cell cores is sorted, and the second voltage sorting information of each of the plurality of cell cores is obtained. Further, based on the first voltage sorting information and the second voltage sorting information, determining sorting change information corresponding to each of the plurality of monomer battery cells, judging whether the sorting change information is greater than or equal to a preset sorting change threshold, if the sorting change information is greater than or equal to the preset sorting change threshold, determining that the monomer battery cell has self-discharge abnormality, and performing replacement early warning on the monomer battery cell after detecting the monomer battery cell in an abnormal state. According to the embodiment of the disclosure, based on the first voltage sequencing information and the second voltage sequencing information, sequencing change information corresponding to each monomer battery cell in the plurality of monomer battery cells is determined, so that a self-discharge rate change condition of each monomer battery cell can be determined, the monomer battery cells with large sequencing change information are detected, namely, the monomer battery cells with abnormal self-discharge rates exist, and when the monomer battery cells with abnormal self-discharge states are detected, replacement early warning of the monomer battery cells is performed, so that the safety and the cruising ability of the electric vehicle are ensured.
Fig. 4 is a schematic structural diagram of a single battery cell abnormal state detection device provided in the embodiment of the present disclosure. The individual battery cell abnormal state detection apparatus may be the server described in the above embodiment, or the individual battery cell abnormal state detection apparatus may be a component or an assembly of the server. The apparatus for detecting abnormal states of a single battery cell provided in the embodiment of the present disclosure may execute the processing procedure provided in the embodiment of the method for detecting abnormal states of a single battery cell, and as shown in fig. 4, the apparatus 40 for detecting abnormal states of a single battery cell includes: a first obtaining module 41, a second obtaining module 42, a detecting module 43; the first obtaining module 41 is configured to obtain first voltage data of each of the multiple battery cells at a target SOC after first charging of the battery system is performed; the second obtaining module 42 is configured to obtain second voltage data of each of the plurality of single battery cells at the target SOC after performing second charging on the battery system; the detection module 43 is configured to detect a single battery cell in an abnormal state based on the first voltage data of each of the plurality of single battery cells and the second voltage data of each of the plurality of single battery cells.
Optionally, the apparatus further comprises: a first control module 44, a second control module 45; the first control module 44 is configured to control the SOC of each of the plurality of individual battery cells to be a target SOC after the first charging of the battery system is performed; the second control module 45 is configured to control the SOC of each of the plurality of individual battery cells to be the target SOC after the second charging of the battery system is performed.
Optionally, the detection module 43 includes a determination unit 431 and a detection unit 432; the determining unit 431 is configured to determine, based on the first voltage data of each of the plurality of individual cells and the second voltage data of each of the plurality of individual cells, information that is corresponding to each of the plurality of individual cells and is used for characterizing a self-discharge rate; the detecting unit 432 is configured to detect a single battery cell in a self-discharge abnormal state based on the information for representing the size of the self-discharge rate.
Optionally, when determining, based on the first voltage data of each of the plurality of individual battery cells and the second voltage data of each of the plurality of individual battery cells, information corresponding to each of the plurality of individual battery cells and used for characterizing a self-discharge rate size, the determining unit 431 is specifically configured to: sequencing the first voltage data of each of the plurality of monomer battery cells to obtain first voltage sequencing information of each of the plurality of monomer battery cells; sorting the second voltage data of each of the plurality of monomer battery cells to obtain second voltage sorting information of each of the plurality of monomer battery cells; determining, based on the first voltage sequencing information and the second voltage sequencing information, sequencing change information corresponding to each of the plurality of individual battery cells, where the sequencing change information is information used for representing a self-discharge rate.
Optionally, when detecting a single battery cell in a self-discharge abnormal state based on the information for representing the size of the self-discharge rate, the detecting unit 432 is specifically configured to: judging whether the sorting change information is larger than or equal to a preset sorting change threshold value; and if the sorting change information is greater than or equal to a preset sorting change threshold, determining that the self-discharge abnormal state exists in the single battery cell of which the sorting change information is greater than or equal to the preset sorting change threshold.
Optionally, the apparatus further comprises: an early warning module 46; the early warning module 46 is configured to perform replacement early warning on a single battery cell in an abnormal state after detecting that the single battery cell is detected.
The apparatus for detecting abnormal states of individual battery cells in the embodiment shown in fig. 4 may be used to implement the technical solution of the above method embodiment, and the implementation principle and the technical effect are similar, which are not described herein again.
Fig. 5 is a schematic structural diagram of an electronic device in an embodiment of the present disclosure. Referring now specifically to fig. 5, a schematic diagram of an electronic device 600 suitable for use in implementing embodiments of the present disclosure is shown. The electronic device shown in fig. 5 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiments of the present disclosure.
As shown in fig. 5, the electronic device 600 may include a processing device (e.g., a central processing unit, a graphics processor, etc.) 601, which may perform various appropriate actions and processes according to a program stored in a Read Only Memory (ROM) 602 or a program loaded from a storage device 608 into a Random Access Memory (RAM) 603 to implement the cell abnormal state detection method according to the embodiments of the present disclosure. In the RAM 603, various programs and data necessary for the operation of the electronic apparatus 600 are also stored. The processing device 601, the ROM 602, and the RAM 603 are connected to each other via a bus 604. An input/output (I/O) interface 605 is also connected to bus 604.
Generally, the following devices may be connected to the I/O interface 605: input devices 606 including, for example, a touch screen, touch pad, keyboard, mouse, camera, microphone, accelerometer, gyroscope, or the like; output devices 607 including, for example, a Liquid Crystal Display (LCD), a speaker, a vibrator, and the like; storage 608 including, for example, tape, hard disk, etc.; and a communication device 609. The communication means 609 may allow the electronic device 600 to communicate with other devices wirelessly or by wire to exchange data. While fig. 5 illustrates an electronic device 600 having various means, it is to be understood that not all illustrated means are required to be implemented or provided. More or fewer devices may alternatively be implemented or provided.
In particular, according to an embodiment of the present disclosure, the processes described above with reference to the flowcharts may be implemented as computer software programs. For example, embodiments of the present disclosure include a computer program product comprising a computer program carried on a non-transitory computer readable medium, the computer program containing program code for performing the method illustrated by the flow chart, thereby implementing the access control method as described above. In such an embodiment, the computer program may be downloaded and installed from a network via the communication means 609, or installed from the storage means 608, or installed from the ROM 602. The computer program, when executed by the processing device 601, performs the above-described functions defined in the methods of the embodiments of the present disclosure.
It should be noted that the computer readable medium in the present disclosure can be a computer readable signal medium or a computer readable storage medium or any combination of the two. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present disclosure, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In contrast, in the present disclosure, a computer readable signal medium may comprise a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: electrical wires, optical cables, RF (radio frequency), etc., or any suitable combination of the foregoing.
In some embodiments, the clients, servers may communicate using any currently known or future developed network Protocol, such as HTTP (HyperText Transfer Protocol), and may be interconnected with any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network ("LAN"), a wide area network ("WAN"), the Internet (e.g., the Internet), and peer-to-peer networks (e.g., ad hoc peer-to-peer networks), as well as any currently known or future developed network.
The computer readable medium may be embodied in the electronic device; or may exist separately without being assembled into the electronic device.
The computer readable medium carries one or more programs which, when executed by the electronic device, cause the electronic device to:
after the battery system is charged for the first time, obtaining first voltage data of each single battery cell in the plurality of single battery cells under a target SOC;
after the battery system is charged for the second time, second voltage data of each single battery cell in the plurality of single battery cells under the target SOC are obtained;
detecting the individual electric core in an abnormal state based on the first voltage data of each of the plurality of individual electric cores and the second voltage data of each of the plurality of individual electric cores.
Optionally, when the one or more programs are executed by the electronic device, the electronic device may further perform other steps described in the above embodiments.
Computer program code for carrying out operations for the present disclosure may be written in any combination of one or more programming languages, including but not limited to an object oriented programming language such as Java, smalltalk, C + +, and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units described in the embodiments of the present disclosure may be implemented by software or hardware. Where the name of an element does not in some cases constitute a limitation on the element itself.
The functions described herein above may be performed, at least in part, by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems on a chip (SOCs), complex Programmable Logic Devices (CPLDs), and the like.
In the context of this disclosure, a machine-readable medium may be a tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The foregoing description is only exemplary of the preferred embodiments of the disclosure and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the disclosure herein is not limited to the particular combination of features described above, but also encompasses other embodiments in which any combination of the features described above or their equivalents does not depart from the spirit of the disclosure. For example, the above features and (but not limited to) the features disclosed in this disclosure having similar functions are replaced with each other to form the technical solution.
Further, while operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are included in the above discussion, these should not be construed as limitations on the scope of the disclosure. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination.
Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.
Claims (10)
1. A method for detecting abnormal states of single battery cells is characterized in that a battery system comprises a plurality of single battery cells, and the method comprises the following steps:
after the battery system is charged for the first time, obtaining first voltage data of each single battery cell in the plurality of single battery cells under a target SOC;
after the battery system is charged for the second time, second voltage data of each single battery cell in the plurality of single battery cells under the target SOC are obtained;
detecting the individual electric core in an abnormal state based on the first voltage data of each of the plurality of individual electric cores and the second voltage data of each of the plurality of individual electric cores.
2. The method of claim 1, wherein prior to obtaining the first voltage data for each of the plurality of cell units at the target SOC, the method further comprises:
after the battery system is charged for the first time, controlling the SOC of each single battery cell in the plurality of single battery cells to be a target SOC;
prior to the obtaining second voltage data for each of the plurality of individual cells at the target SOC, the method further includes:
and after the battery system is charged for the second time, controlling the SOC of each single battery cell in the plurality of single battery cells to be the target SOC.
3. The method of claim 1, wherein the detecting the individual cell in which the abnormal state exists based on the first voltage data of each of the plurality of individual cells and the second voltage data of each of the plurality of individual cells comprises:
determining information, corresponding to each of the plurality of monomer cells, for characterizing a self-discharge rate based on the first voltage data of each of the plurality of monomer cells and the second voltage data of each of the plurality of monomer cells;
and detecting the single battery cell in the self-discharge abnormal state based on the information for representing the size of the self-discharge rate.
4. The method of claim 3, wherein the determining information that characterizes a magnitude of a self-discharge rate that corresponds to each of the plurality of individual cells based on the first voltage data for each of the plurality of individual cells and the second voltage data for each of the plurality of individual cells comprises:
sequencing the first voltage data of each of the plurality of monomer battery cells to obtain first voltage sequencing information of each of the plurality of monomer battery cells;
sequencing second voltage data of each of the plurality of monomer battery cells to obtain second voltage sequencing information of each of the plurality of monomer battery cells;
determining, based on the first voltage sequencing information and the second voltage sequencing information, sequencing change information corresponding to each of the plurality of individual battery cells, where the sequencing change information is information used for representing a self-discharge rate.
5. The method of claim 4, wherein the detecting the single cell in which the self-discharge abnormal state exists based on the information characterizing the magnitude of the self-discharge rate comprises:
judging whether the sorting change information is greater than or equal to a preset sorting change threshold value or not;
and if the sequencing change information is greater than or equal to a preset sequencing change threshold, determining that the self-discharge abnormal state exists in the single battery cell of which the sequencing change information is greater than or equal to the preset sequencing change threshold.
6. The method of claim 1, further comprising:
and after detecting that the single battery cell in the abnormal state exists, carrying out replacement early warning on the single battery cell.
7. The utility model provides a monomer electric core abnormal state detection device which characterized in that, includes a plurality of monomer electric cores in the battery system, the device includes:
the first obtaining module is used for obtaining first voltage data of each single battery cell in the plurality of single battery cells under a target SOC after the first charging of the battery system is carried out;
a second obtaining module, configured to obtain second voltage data of each cell in the plurality of cell cores under the target SOC after second charging of the battery system is performed;
the detection module is configured to detect a single battery cell in an abnormal state based on the first voltage data of each of the plurality of single battery cells and the second voltage data of each of the plurality of single battery cells.
8. The apparatus of claim 7, further comprising:
and the early warning module is used for carrying out replacement early warning on the single battery cell after the single battery cell in the abnormal state is detected.
9. An electronic device, comprising:
a memory;
a processor; and
a computer program;
wherein the computer program is stored in the memory and configured to be executed by the processor to implement the method of any one of claims 1-6.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the method according to any one of claims 1-6.
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| CN115980596A (en) * | 2023-03-17 | 2023-04-18 | 合肥力高动力科技有限公司 | Method for detecting short circuit in power battery on line |
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| CN115980596A (en) * | 2023-03-17 | 2023-04-18 | 合肥力高动力科技有限公司 | Method for detecting short circuit in power battery on line |
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