CN111123118B - Method and device for detecting micro short circuit of battery, equipment and storage medium - Google Patents
Method and device for detecting micro short circuit of battery, equipment and storage medium Download PDFInfo
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- CN111123118B CN111123118B CN201911397167.5A CN201911397167A CN111123118B CN 111123118 B CN111123118 B CN 111123118B CN 201911397167 A CN201911397167 A CN 201911397167A CN 111123118 B CN111123118 B CN 111123118B
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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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
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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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The embodiment of the application discloses a method, a device, equipment and a storage medium for detecting micro short circuit of a battery, wherein the method comprises the following steps: determining theoretical discharge capacity and actual discharge capacity of a battery in a discharge interval, wherein the theoretical discharge capacity is the discharge capacity of the battery under the condition that no micro short circuit occurs in the discharge interval; determining a difference between the actual discharge capacity and the theoretical discharge capacity; and detecting the internal micro short circuit of the battery according to the relation between the absolute value of the difference and a first threshold value.
Description
Technical Field
The embodiment of the application relates to electronic technology, and relates to a method, a device, equipment and a storage medium for detecting micro short circuit of a battery.
Background
At present, lithium ion batteries have the characteristics of high voltage, high energy, high power, long service life and the like, and are widely applied to the fields of electric automobiles, consumer electronic products and the like. However, the lithium ion battery has the biggest defects of poor safety performance and easy occurrence of thermal runaway; therefore, the safety performance of the lithium ion battery is not negligible.
Generally, a protection board is arranged in a terminal with a lithium ion battery and used for controlling overcharge, overdischarge, overvoltage, overcurrent, temperature and the like of the lithium ion battery, so that the use safety performance of the battery is improved, and the use safety of the terminal can be ensured. However, the function of the protective plate has not been able to detect a short circuit (i.e., an internal micro short circuit) inside the battery, a leakage current, and the like. Although the process of causing internal micro short circuit and leakage current of the battery is slow, safety problems such as thermal runaway, overcharge and overdischarge may occur to a certain extent. Therefore, it is important to accurately detect the internal micro short circuit and the leakage current of the battery, and to ensure the safety of the battery.
Disclosure of Invention
In view of this, embodiments of the present application provide a method, an apparatus, a device, and a storage medium for detecting a micro short circuit of a battery.
The technical scheme of the embodiment of the application is realized as follows:
in a first aspect, an embodiment of the present application provides a method for detecting a micro short circuit of a battery, where the method includes: determining theoretical discharge capacity and actual discharge capacity of a battery in a discharge interval, wherein the theoretical discharge capacity is the discharge capacity of the battery under the condition that the battery is not subjected to micro short circuit in the discharge interval; determining a difference between the actual discharge capacity and the theoretical discharge capacity; and detecting the internal micro short circuit of the battery according to the relation between the absolute value of the difference and a first threshold value.
In a second aspect, an embodiment of the present application provides a device for detecting a micro short circuit of a battery, including: the device comprises a determining module and a judging module, wherein the determining module is used for determining theoretical discharge capacity and actual discharge capacity of a battery in a discharge interval, and the theoretical discharge capacity is the discharge capacity of the battery under the condition that no micro short circuit occurs in the discharge interval; determining a difference between the actual discharge capacity and the theoretical discharge capacity; and the detection module is used for carrying out micro short circuit detection on the interior of the battery according to the relation between the absolute value of the difference value and a first threshold value.
In a third aspect, an embodiment of the present application provides an electronic device, including a memory and a processor, where the memory stores a computer program that is executable on the processor, and the processor executes the computer program to implement the steps in the method for detecting a micro short circuit of a battery according to any of the embodiments of the present application.
In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps in the method for detecting a micro short circuit of a battery according to any one of the embodiments of the present application.
In the embodiment of the application, theoretical discharge capacity and actual discharge capacity of a battery in a discharge interval are determined, then a difference value between the actual discharge capacity and the theoretical discharge capacity is determined, and micro-circuit detection is carried out on the interior of the battery according to the relation between the absolute value of the difference value and a first threshold value; therefore, the detection method does not depend on the discharge capacity of any other battery, so that the accuracy of the detection result can be improved.
Drawings
Fig. 1 is a schematic flow chart illustrating an implementation of a method for detecting a micro short circuit of a battery according to an embodiment of the present disclosure;
fig. 2 is a schematic flow chart illustrating another implementation of a method for detecting a micro short circuit of a battery according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a discharge region according to an embodiment of the present application;
fig. 4 is a schematic flow chart illustrating a further implementation of a method for detecting a micro short circuit of a battery according to an embodiment of the present disclosure;
fig. 5 is a schematic flow chart illustrating an implementation of another method for detecting a micro short circuit of a battery according to an embodiment of the present disclosure;
fig. 6A is a schematic structural diagram of a device for detecting a micro short circuit of a battery according to an embodiment of the present disclosure;
fig. 6B is a schematic structural diagram of another device for detecting micro short circuit of a battery according to an embodiment of the present disclosure;
fig. 7 is a hardware entity diagram of an electronic device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, specific technical solutions of the present application will be described in further detail below with reference to the accompanying drawings in the embodiments of the present application. The following examples are intended to illustrate the present application but are not intended to limit the scope of the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of the present application only and is not intended to be limiting of the application.
In the following description, reference is made to "some embodiments" which describe a subset of all possible embodiments, but it is understood that "some embodiments" may be the same subset or different subsets of all possible embodiments, and may be combined with each other without conflict.
It should be noted that the terms "first \ second \ third" referred to in the embodiments of the present application merely distinguish similar or different objects and do not represent a specific ordering with respect to the objects, and it should be understood that "first \ second \ third" may be interchanged under certain ordering or sequence circumstances to enable the embodiments of the present application described herein to be implemented in other orders than illustrated or described herein.
The detection method of battery short circuit a little that this application embodiment provided can be applied to electronic equipment, electronic equipment can be various types of equipment that has secondary battery at the in-process of implementing, for example electronic equipment can include intelligent mobile terminal (for example cell-phone), portable power source (for example charge precious, travel and charge), electric automobile, notebook computer, unmanned aerial vehicle, panel computer, electronic book, electron cigarette, intelligent electronic equipment (for example wrist-watch, bracelet, intelligent glasses, robot of sweeping the floor), small-size electronic product (for example wireless earphone, bluetooth stereo set, electric toothbrush, chargeable wireless mouse) etc.. The functions implemented by the method can be implemented by calling program code by a processor in the electronic device, and the program code can be stored in a computer storage medium.
Fig. 1 is a schematic view of an implementation flow of a method for detecting a micro short circuit of a battery according to an embodiment of the present application, and as shown in fig. 1, the method at least includes the following steps 101 to 103:
The battery may be a single battery, or may be a battery pack including a plurality of single batteries. The discharge interval is typically a period of time.
and 103, carrying out micro short circuit detection on the interior of the battery according to the relation between the absolute value of the difference and a first threshold value.
In some embodiments, the electronic device may determine that a micro short circuit has occurred inside the battery in a case where an absolute value of the difference is greater than the first threshold; and returning to the step 101 to re-determine the theoretical discharge capacity and the actual discharge capacity to perform micro short circuit detection again when the absolute value of the difference is less than or equal to the first threshold.
In the embodiment of the application, the detection of the micro short circuit of the battery is realized by comparing the difference between the actual discharge capacity and the theoretical discharge capacity of the battery; the method for determining the theoretical discharge capacity and the actual discharge capacity does not depend on the electrical parameter value of the other battery, so that the detection result is not influenced by the aging degree of the other battery, the detection accuracy rate of the micro short circuit of the battery can be improved, and the safety risk caused by the micro short circuit can be avoided in time.
Fig. 2 is a schematic flow chart illustrating an implementation of another method for detecting a micro short circuit of a battery according to an embodiment of the present invention, and as shown in fig. 2, the method at least includes the following steps 201 to 206:
In the case that the absolute value of the difference is greater than the first threshold, it indicates that a micro short circuit occurs inside the battery, and then step 204 is executed to further determine the severity of the micro short circuit, that is, determine whether the absolute value of the difference is greater than a second threshold, where the second threshold is greater than the first threshold.
It should be noted that, when the absolute value of the difference is smaller than or equal to the first threshold, it indicates that no micro short circuit occurs inside the battery, at this time, the timer may be started, and when the timing time of the timer reaches the preset time, the step 201 is executed again to detect the micro short circuit of the battery.
it can be understood that if the difference between the actual discharge capacity and the theoretical discharge capacity is relatively large, it indicates that the micro short circuit condition inside the battery is relatively serious, and at this time, after the relevant prompt information is output, the discharge circuit of the battery needs to be disconnected, that is, the power supply to the electronic device is prohibited, so as to shut down the electronic device, thereby avoiding the safety problems caused by thermal runaway, overcharge, overdischarge, and the like.
For example, the electronic device disconnects the battery discharge circuit ten minutes after outputting the prompt message. Or immediately shutting down after the prompt message is output.
When the electronic device is implemented, the prompt information can be output through at least one of the following: voice, text, vibration. The prompt message is used for prompting the inside of the battery to generate micro short circuit. For example, the prompt message is "the owner, your battery is easy to have a micro short circuit, please replace the battery in time to avoid danger".
And step 206, outputting the prompt message.
It should be noted that, the execution sequence of step 203 and step 204 is not limited, that is, when the absolute value of the difference is greater than the first threshold and smaller than the second threshold, a prompt message is output, where the prompt message is used to prompt that a micro short circuit occurs inside the battery; and disconnecting a discharge circuit of the battery after outputting the prompt information if the absolute value of the difference is greater than or equal to a second threshold.
The embodiment of the present application further provides a method for detecting a micro short circuit of a battery, which at least includes the following steps 301 to 308:
step 301, obtaining a maximum capacity value of the battery when no micro short circuit occurs in a historical discharge interval.
The processing procedure of the electronic device for detecting the battery micro short circuit in the historical discharge interval is the same as the processing procedure in the current discharge interval. That is, the maximum capacity value is a value obtained when the electronic device has not had a micro short circuit in the discharge section in the previous detection.
Step 302, determining a target electrical parameter value of the battery in a discharging state in a current discharging interval.
In some embodiments, when the electronic device implements step 302, as shown in fig. 3, the electronic device may determine a first electrical parameter value of the battery after controlling the battery to be in a static state for a first period of time within the discharge interval 30; controlling the battery to be in the discharging state for a second time period, and determining a second electrical parameter value of the battery after controlling the battery to be in the standing state for the first time period; wherein the first duration is greater than the second duration; determining the target electrical parameter value from the first electrical parameter value and the second electrical parameter value; therefore, the obtained target electrical parameter value is more reliable and accurate, and the detection accuracy of the micro short circuit of the battery is improved.
The stationary state and the discharge state are relative concepts, and the battery is actually discharged in the stationary state, but the discharge current is small, that is, the discharge current in the stationary state is significantly smaller than the discharge current in the discharge state. For example, the discharge current of the battery in the static state was 0.1mA, and the discharge current of the battery in the discharge state was 0.8 mA.
The electronic device may determine a difference between the first electrical parameter value and the second electrical parameter value as a target electrical parameter value; the product of the difference and the first coefficient may also be determined as the target electrical parameter value.
In some embodiments, the electrical parameter of the battery includes a depth of discharge or an Open Circuit Voltage (OCV), and correspondingly, the target electrical parameter value includes a target depth of discharge or a target Open Circuit Voltage.
Step 303, determining the theoretical discharge capacity according to the maximum capacity value and the target electrical parameter value.
When the electronic device is implemented, the ratio between the maximum capacity value and the target electrical parameter value can be determined as the theoretical discharge capacity, and the product of the ratio and the second coefficient can also be determined as the theoretical discharge capacity.
And step 304, determining the integral of the discharge current of the battery in the current discharge interval to obtain the actual discharge capacity.
Step 305, determining a difference value between the actual discharge capacity and the theoretical discharge capacity;
step 306, determining whether the absolute value of the difference is greater than a first threshold; if yes, go to step 307; otherwise, go to step 308;
in some embodiments, in a case that the absolute value of the difference is smaller than or equal to the first threshold, it indicates that no micro short circuit occurs inside the battery, and after a period of time, the method may return to step 401 to re-determine the theoretical discharge capacity and the actual discharge capacity to perform the micro short circuit detection again.
Step 307, determining that a micro short circuit occurs inside the battery.
Step 308, updating the maximum capacity value according to the actual discharge capacity and the target electrical parameter value; the updated maximum capacity value is used to determine the theoretical discharge capacity at the next micro-short detection.
Under the condition that micro short circuit does not occur in the battery, the maximum capacity value needs to be updated according to the actual discharge capacity and the target electric parameter value; therefore, the problem of reduction of detection accuracy caused by battery aging can be solved. This is because the discharge capacity of the battery decreases as the battery ages, and if the maximum capacity value is not updated in time, the deviation of the determined theoretical discharge capacity becomes large, and the detection misjudgment rate increases.
In some embodiments, the maximum capacity value may be determined as a ratio between the actual discharge capacity and the target electrical parameter value, or a product of the ratio and the third coefficient.
Fig. 4 is a schematic flow chart illustrating an implementation of another method for detecting a micro short circuit of a battery according to an embodiment of the present application, and as shown in fig. 4, the method may include the following steps 401 to 412:
In some embodiments, the ratio of the discharged capacity of the battery at a certain time to the total capacity of the battery, or the product of the ratio and the fourth coefficient is determined as the depth of discharge of the battery. For example, when the battery was discharged from a full charge of 4.4V, the discharge capacity to a cut-off voltage of 3V was 4000mAh, that is, the total capacity of the battery was 4000mAh, and the discharged capacity was 2000mAh after the battery was left to stand for 2 hours, the corresponding depth of discharge was 2000/4000-0.5.
it should be noted that the order of executing step 412 and returning to execute step 401 is not limited, and step 412 and returning to execute step 401 may be executed in parallel.
In the related technology, a method for detecting a micro short circuit of a battery is mainly implemented by obtaining a first reference charging capacity of a single battery to be detected at a first charging end time and a second reference charging capacity of a single battery to be detected at a second charging end time, wherein the reference charging capacity is a difference value between electric quantity of the single battery to be detected and electric quantity of a reference single battery, and the reference single battery is a single battery having a maximum voltage value at the charging end time among all single batteries included in the battery pack to be detected; and determining that the micro short circuit occurs in the single battery to be tested according to the difference value of the first reference charging capacity and the second reference charging capacity.
However, this method has several drawbacks:
(1) the reference charge capacity needs to be determined in the battery pack according to a certain highest voltage of the single cells, so the method is only limited to the application in the battery pack;
(2) because the reference single battery is the battery cell with the maximum voltage value selected from the battery pack, the method can only be applied to the battery packs connected in series, and the battery cell voltages are equal when the battery cells are connected in parallel, so that the detection cannot be realized;
(3) the method cannot exclude the condition of battery aging, namely, the aging condition of a certain battery cell is serious, so that the voltage is relatively low, but the battery cell is not short-circuited, so that the misjudgment can exist.
Based on this, an exemplary application of the embodiment of the present application in a practical application scenario will be described below.
The embodiment of the application provides a mode according to the actual measurement value and the theoretical calculated value of the capacity of discharging among the battery discharge process, detects the inside little short circuit of battery, can improve the inside little short circuit of battery and detect the accuracy like this, strengthens the inside little short circuit detection's of battery suitability, reduces the battery and detects the erroneous judgement rate of trouble in the use.
As shown in fig. 5, the specific process includes the following steps 501 to 503:
ΔQ1＝Qmax/(DOD1-DOD2) (1)；
DOD1 and DOD2 in equation (1) refer to a first depth of discharge and a second depth of discharge, respectively, at different points in time within the discharge interval. Qmax is the maximum capacity value of the battery in the current state obtained in the historical discharge interval in which it is determined that there is no short circuit, and Qmax can be calculated by using equation (2):
Qmax＝ΔQ/(DOD1-DOD2) (2)；
Δ Q in equation (2) refers to an actual discharge capacity value within the history discharge interval, and DOD1 and DOD2 in equation (2) are a first depth of discharge and a second depth of discharge at different points in time within the history discharge interval, respectively. Generally, the initial value of Qmax is the battery design capacity value.
It should be further noted that the discharge interval is defined as: firstly, a certain discharge node needs to meet the requirement that a terminal continues for a first time period t in a standing standby state or a low-current state, then voltage is read, and a DOD1 value is correspondingly obtained, wherein the time t needs to meet the requirement that t is greater than 2h, and the low-current value, such as 0.1C, is discharged by current of 0.1 multiplying power; and then, after discharging for a second time period, controlling the terminal to keep the first time period t in a standing standby state or a low-current state, and obtaining a DOD2 value.
DOD refers to the percentage of capacity value discharged over a certain period of time to the total capacity of the battery, wherein the discharge can be initiated from full charge to shutdown voltage (or the cutoff voltage of the battery) with a small discharge current (e.g., <0.2C), and then the discharged capacity value is recorded as the total capacity of the battery. For example, if the discharge capacity value is 4000mAh when the discharge is started from the full charge of 4.4V and the discharge is started to the cutoff voltage of 3V with a small discharge current and the discharge capacity value is 2000mAh when the discharge is started to 4V, the DOD corresponding to 4V is 2000/4000-50%.
ΔQ1′＝∫idt (3)；
in calculating Δ Q1', the time interval dt of current integration may be any value, preferably less than 1 s.
In comparing the relationship between Δ Q1 and Δ Q1', the value of x is an empirical value, and is typically 0 ≦ x ≦ Δ Q1 × 1%.
In the embodiment of the application, the method for detecting the internal micro short circuit of the battery by analyzing the relation between the actual measured value of the discharged capacity and the theoretical calculated value in the discharging process of the battery can improve the accuracy of the detection of the micro short circuit of the battery, enhance the applicability of the detection of the micro short circuit of the battery and reduce the misjudgment rate of faults in the using process of the battery.
The embodiment of the application further provides a circuit detection method, which utilizes the relationship between the open-circuit voltage OCV and the electric quantity to realize the detection of the internal micro short circuit of the battery.
For example, after the battery is fully charged, the battery is discharged with a small current (e.g., <0.2C), and the discharged capacity value is recorded for each voltage, which can be approximated to OCV, so that a graph of the discharged capacity value versus OCV can be obtained.
Then, the other steps can be carried out analogously to the above-described procedure, i.e. Qmax ═ Δ Q/(V) OCV1 -V OCV2 )。
(1) The theoretical discharge capacity Δ Q1 in a certain discharge interval was calculated as shown in equation (4):
ΔQ1＝Qmax/(V OCV1 -V OCV2 ) (4)；
(2) and (3) performing current integration on the terminal battery in the corresponding discharging process by adopting a formula (5) to obtain the actual discharging capacity delta Q1' in the discharging interval:
ΔQ1′＝∫idt (5)；
(3) comparing the relation between Δ Q1 and Δ Q1', if Δ Q1 ═ Δ Q1 ± x, it is proved that the battery has no micro short circuit, and if there is no such equation relation, it is proved that the battery has internal micro short circuit.
Based on the foregoing embodiments, the present application provides a device for detecting a micro short circuit of a battery, where the device includes modules that can be implemented by a processor in an electronic device; of course, the implementation can also be realized through a specific logic circuit; in implementation, the processor may be a Central Processing Unit (CPU), a Microprocessor (MPU), a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), or the like.
Fig. 6A is a schematic structural diagram of a device for detecting a micro short circuit of a battery according to an embodiment of the present application, and as shown in fig. 6A, the device 600 includes a determining module 601 and a detecting module 602, where:
a determining module 601, configured to determine a theoretical discharge capacity and an actual discharge capacity of a battery in a discharge interval, where the theoretical discharge capacity is a discharge capacity of the battery under the assumption that no micro short circuit occurs in the discharge interval; determining a difference between the actual discharge capacity and the theoretical discharge capacity;
a detecting module 602, configured to perform micro short circuit detection on the inside of the battery according to a relationship between the absolute value of the difference and a first threshold.
In some embodiments, the detecting module 602 is configured to determine that a micro short circuit occurs inside the battery if the absolute value of the difference is greater than the first threshold; and when the absolute value of the difference is smaller than or equal to the first threshold, triggering the determining module 601 to re-determine the theoretical discharge capacity and the actual discharge capacity so as to perform micro short circuit detection again.
In some embodiments, the determining module 601 is configured to obtain a maximum capacity value of the battery when no micro short circuit occurs in a historical discharge interval; determining a target electrical parameter value of the battery when the battery is in a discharge state within the discharge interval; and determining the theoretical discharge capacity according to the maximum capacity value and the target electric parameter value.
In some embodiments, the determining module 601 is configured to determine the first electrical parameter value of the battery after controlling the battery to be in a static state for a first time period within the discharge interval; controlling the battery to be in the discharging state for a second time period, and determining a second electrical parameter value of the battery after controlling the battery to be in the standing state for the first time period; wherein the first duration is greater than the second duration; determining the target electrical parameter value from the first electrical parameter value and the second electrical parameter value.
In some embodiments, the electrical parameter of the battery comprises a depth of discharge or an open circuit voltage, and the target electrical parameter value comprises a target depth of discharge or a target open circuit voltage, respectively.
In some embodiments, as shown in fig. 6B, the apparatus 600 further comprises an update module 603 and/or a prompt module 604; the updating module 603 is configured to update the maximum capacity value according to the actual discharge capacity and the target electrical parameter value when the absolute value of the difference is smaller than or equal to the first threshold; the updated maximum capacity value is used to determine the theoretical discharge capacity at the next micro-short detection.
A prompt module 604, configured to output a prompt message when the absolute value of the difference is greater than the first threshold and smaller than a second threshold, where the prompt message is used to prompt that a micro short circuit occurs inside the battery; and disconnecting a discharge circuit of the battery after outputting the prompt information if the absolute value of the difference is greater than or equal to the second threshold.
The above description of the apparatus embodiments, similar to the above description of the method embodiments, has similar beneficial effects as the method embodiments. For technical details not disclosed in the embodiments of the apparatus of the present application, reference is made to the description of the embodiments of the method of the present application for understanding.
In the embodiment of the present application, if the method for detecting a micro short circuit of a battery is implemented in the form of a software functional module and is sold or used as a standalone product, the method may also be stored in a computer-readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application, in essence or parts contributing to the related art, may be embodied in the form of a software product, where the computer software product is stored in a storage medium and includes several instructions for enabling an electronic device (which may be an intelligent mobile terminal, a mobile power supply, an electric vehicle, a notebook computer, an unmanned aerial vehicle, a tablet computer, an electronic book, an electronic cigarette, an intelligent electronic device, a small electronic product, or the like) to execute all or part of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read Only Memory (ROM), a magnetic disk, or an optical disk. Thus, embodiments of the present application are not limited to any specific combination of hardware and software.
Correspondingly, an embodiment of the present application provides an electronic device, fig. 7 is a schematic diagram of a hardware entity of the electronic device according to the embodiment of the present application, and as shown in fig. 7, the hardware entity of the electronic device 700 includes: the detection method comprises a memory 701 and a processor 702, wherein the memory 701 stores a computer program which can run on the processor 702, and the processor 702 executes the program to realize the steps in the detection method for the micro short circuit of the battery provided in the embodiment.
The Memory 701 is used for storing instructions and applications executable by the processor 702, and may also buffer data (e.g., image data, audio data, voice communication data, and video communication data) to be processed or already processed by the processor 702 and modules in the electronic device 700, and may be implemented by a FLASH Memory (FLASH) or a Random Access Memory (RAM).
Accordingly, embodiments of the present application provide a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the steps in the method for detecting a micro short circuit of a battery provided in the above embodiments.
Here, it should be noted that: the above description of the storage medium and device embodiments is similar to the description of the method embodiments above, with similar advantageous effects as the method embodiments. For technical details not disclosed in the embodiments of the storage medium and apparatus of the present application, reference is made to the description of the embodiments of the method of the present application for understanding.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application. The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the modules is only one logical functional division, and there may be other division ways in actual implementation, such as: multiple modules or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or modules may be electrical, mechanical or other.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules; can be located in one place or distributed on a plurality of network units; some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all functional modules in the embodiments of the present application may be integrated into one processing unit, or each module may be separately regarded as one unit, or two or more modules may be integrated into one unit; the integrated module can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as a removable Memory device, a Read Only Memory (ROM), a magnetic disk, or an optical disk.
Alternatively, the integrated units described above in the present application may be stored in a computer-readable storage medium if they are implemented in the form of software functional modules and sold or used as independent products. Based on such understanding, the technical solutions of the embodiments of the present application may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for enabling an electronic device (which may be an intelligent mobile terminal, a mobile power source, an electric vehicle, a notebook computer, an unmanned aerial vehicle, a tablet computer, an electronic book, an electronic cigarette, an intelligent electronic device, a small electronic product, or the like) to execute all or part of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a removable storage device, a ROM, a magnetic or optical disk, or other various media that can store program code.
The methods disclosed in the several method embodiments provided in the present application may be combined arbitrarily without conflict to obtain new method embodiments.
Features disclosed in several of the product embodiments provided in the present application may be combined in any combination to yield new product embodiments without conflict.
The features disclosed in the several method or apparatus embodiments provided herein may be combined in any combination to arrive at a new method or apparatus embodiment without conflict.
The above description is only for the embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (9)
1. A method for detecting a micro short circuit in a battery, the method comprising:
determining theoretical discharge capacity and actual discharge capacity of a battery in a discharge interval, wherein the theoretical discharge capacity is the discharge capacity of the battery under the condition that the battery is not subjected to micro short circuit in the discharge interval;
determining a difference between the actual discharge capacity and the theoretical discharge capacity;
detecting the internal micro short circuit of the battery according to the relation between the absolute value of the difference and a first threshold value;
the determination of the theoretical discharge capacity of the battery in the discharge interval comprises the following steps:
acquiring a maximum capacity value of the battery when no micro short circuit occurs in a historical discharge interval; wherein the maximum capacity value is determined according to the actual discharge capacity value of the historical discharge interval;
determining a target electrical parameter value of the battery when the battery is in a discharge state within the discharge interval;
and determining the theoretical discharge capacity according to the maximum capacity value and the target electric parameter value.
2. The method according to claim 1, wherein the detecting of the micro short circuit in the battery based on the relationship between the absolute value of the difference and the first threshold value comprises:
determining that a micro short circuit occurs inside the battery in a case where an absolute value of the difference is greater than the first threshold;
and returning to re-determine the theoretical discharge capacity and the actual discharge capacity to perform micro short circuit detection again when the absolute value of the difference is less than or equal to the first threshold.
3. The method of claim 1, wherein said determining a target electrical parameter value for the battery while in a discharged state for the discharge interval comprises:
in the discharging interval, after the battery is controlled to be in a static state for a first time, determining a first electrical parameter value of the battery;
controlling the battery to be in the discharging state for a second time period, and determining a second electrical parameter value of the battery after controlling the battery to be in the standing state for the first time period; wherein the first duration is greater than the second duration;
determining the target electrical parameter value from the first electrical parameter value and the second electrical parameter value.
4. The method of claim 3, wherein the electrical parameter of the battery comprises a depth of discharge or an open circuit voltage, and the target electrical parameter value comprises a target depth of discharge or a target open circuit voltage, respectively.
5. The method according to any one of claims 1 to 4, further comprising:
updating the maximum capacity value according to the actual discharge capacity and the target electrical parameter value when the absolute value of the difference is less than or equal to the first threshold;
the updated maximum capacity value is used to determine the theoretical discharge capacity at the next micro-short detection.
6. The method according to any one of claims 1 to 4, further comprising:
outputting prompt information under the condition that the absolute value of the difference is larger than the first threshold and smaller than a second threshold, wherein the prompt information is used for prompting that micro short circuit occurs inside the battery;
and disconnecting a discharge circuit of the battery after outputting the prompt information if the absolute value of the difference is greater than or equal to the second threshold.
7. A device for detecting a micro short circuit in a battery, comprising:
the device comprises a determining module, a judging module and a judging module, wherein the determining module is used for determining theoretical discharge capacity and actual discharge capacity of a battery in a discharge interval, and the theoretical discharge capacity is the discharge capacity of the battery under the condition that no micro short circuit occurs in the discharge interval; determining a difference between the actual discharge capacity and the theoretical discharge capacity; wherein the determining of the theoretical discharge capacity of the battery in the discharge interval comprises: acquiring a maximum capacity value of the battery when no micro short circuit occurs in a historical discharge interval; wherein the maximum capacity value is determined according to the actual discharge capacity value of the historical discharge interval; determining a target electrical parameter value of the battery when the battery is in a discharge state within the discharge interval; determining the theoretical discharge capacity according to the maximum capacity value and the target electrical parameter value;
and the detection module is used for carrying out micro short circuit detection on the interior of the battery according to the relation between the absolute value of the difference value and a first threshold value.
8. An electronic device comprising a memory and a processor, the memory storing a computer program operable on the processor, wherein the processor implements the steps of the method for detecting a micro-short circuit in a battery according to any one of claims 1 to 6 when executing the program.
9. A computer-readable storage medium, on which a computer program is stored, the computer program, when being executed by a processor, implementing the steps in the method for detecting a micro-short circuit of a battery according to any one of claims 1 to 6.
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| CN113281676B (en) * | 2020-12-03 | 2023-04-14 | 珠海迈巨微电子有限责任公司 | Device for judging leakage current in battery and battery management system |
| CN114264961B (en) * | 2021-12-23 | 2023-09-15 | 蜂巢能源科技(无锡)有限公司 | Method and device for detecting short circuit in battery cell and electronic equipment |
| CN113976484B (en) * | 2021-12-28 | 2022-03-11 | 南京日托光伏新能源有限公司 | Grading electric leakage screening method for solar cell |
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