CN108663627B - Battery self-discharge detection method and battery self-discharge detection device - Google Patents
Battery self-discharge detection method and battery self-discharge detection device Download PDFInfo
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- CN108663627B CN108663627B CN201810266384.XA CN201810266384A CN108663627B CN 108663627 B CN108663627 B CN 108663627B CN 201810266384 A CN201810266384 A CN 201810266384A CN 108663627 B CN108663627 B CN 108663627B
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Abstract
The invention provides a battery self-discharge detection method and a battery self-discharge detection device, wherein the method comprises the following steps: acquiring open-circuit voltages of the battery at N moments to obtain N two-dimensional space point coordinates corresponding to the open-circuit voltages one by one, wherein N is an integer greater than or equal to 2; performing linear fitting on the N two-dimensional space point coordinates to obtain a fitting straight line; and judging whether the self-discharge size of the battery is abnormal or not according to the fitted straight line. According to the invention, the open-circuit voltage under N moments can be obtained only by idling the battery for a short time, and then the self-discharge condition of the battery is judged through linear fitting, so that the detection time required by the self-discharge detection of the battery is greatly shortened, and the self-discharge detection efficiency of the battery is improved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery self-discharge detection method and a battery self-discharge detection device.
Background
The self-discharge of the battery refers to a phenomenon that the battery still loses electric quantity when the battery is in an idle and unused state, and the self-discharge of the battery can cause the voltage of the battery to gradually decrease under the condition of no load. The battery applied to the mobile terminal, for example, the lithium ion battery, has a certain degree of self-discharge due to the micro short circuit between the positive and negative electrodes inside the battery and/or the presence of trace impurities in the positive and negative electrode materials and the electrolyte, and when the self-discharge of the battery is too large, the voltage of the battery is easily reduced below the over-protection voltage during long-term idle or charging and discharging processes, so that the battery bulges, and the reliability and safety of the battery are seriously reduced.
In view of the damaging effect of swelling on the battery caused by excessive self-discharge, it is necessary to detect the self-discharge of the battery in the development or application of the battery. At present, when detecting the self-discharge of the battery, the following method is mainly adopted: suppose that the customer has a request for a battery that the open-circuit voltage of the battery after 30 days of idling in a certain state is not lower than the OCV0The tester idles the battery for 30 days, and measures the open-circuit voltage OCV of the battery after 30 days1Finally by comparing the OCVs1And OCV0And judging whether the self-discharge of the battery is too large. In this way, the battery needs to be idle for a long time according to the specific requirements of the customer, that is, the required detection time is long, so that the self-discharge detection efficiency of the battery is low.
Disclosure of Invention
The embodiment of the invention provides a battery self-discharge detection method and a battery self-discharge detection device, and aims to solve the problem that the self-discharge detection efficiency of a battery is low due to long detection time required by a self-discharge detection method in the prior art.
In order to solve the technical problem, the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a battery self-discharge detection method, including:
acquiring open-circuit voltages of the battery at N moments to obtain N two-dimensional space point coordinates corresponding to the open-circuit voltages one by one, wherein N is an integer greater than or equal to 2;
performing linear fitting on the N two-dimensional space point coordinates to obtain a fitting straight line;
and judging whether the self-discharge size of the battery is abnormal or not according to the fitted straight line.
In a second aspect, an embodiment of the present invention further provides a battery self-discharge detection apparatus, including:
the battery open-circuit detection device comprises an acquisition module, a detection module and a control module, wherein the acquisition module is used for acquiring the open-circuit voltage of the battery at N moments to obtain N two-dimensional space point coordinates corresponding to the open-circuit voltage one by one at the moments, and N is an integer greater than or equal to 2;
the linear fitting module is used for performing linear fitting on the N two-dimensional space point coordinates to obtain a fitting straight line;
and the judging module is used for judging whether the self-discharge size of the battery is abnormal or not according to the fitted straight line.
In a third aspect, an embodiment of the present invention further provides a battery self-discharge detection apparatus, including a processor, a memory, and a computer program stored on the memory and executable on the processor, where the computer program, when executed by the processor, implements the steps of the battery self-discharge detection method.
In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the above battery self-discharge detection method are implemented.
The invention has the following beneficial technical effects:
in the embodiment of the invention, N two-dimensional space point coordinates corresponding to the open-circuit voltage one by one at N moments are obtained by obtaining the open-circuit voltage of the battery at the N moments, wherein N is an integer greater than or equal to 2; performing linear fitting on the N two-dimensional space point coordinates to obtain a fitting straight line; and judging whether the self-discharge size of the battery is abnormal or not according to the fitted straight line. The open-circuit voltage under N moments can be obtained only by leaving the battery idle for a short time, and then the self-discharge condition of the battery is judged through linear fitting, so that the detection time required by the self-discharge detection of the battery is greatly shortened, and the self-discharge detection efficiency of the battery is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a flowchart of a battery self-discharge detection method according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for detecting self-discharge of a battery according to another embodiment of the present invention;
FIG. 3 is a diagram illustrating a method for detecting self-discharge of a battery according to another embodiment of the present invention;
FIG. 4 is a flow chart of a method for detecting self-discharge of a battery according to another embodiment of the present invention;
FIG. 5 is a diagram illustrating a method for detecting self-discharge of a battery according to another embodiment of the present invention;
FIG. 6 is a block diagram of a battery self-discharge detection device according to an embodiment of the present invention;
fig. 7 is a structural diagram of a determination module in the battery self-discharge detection apparatus according to an embodiment of the present invention;
fig. 8 is a second structural diagram of a battery self-discharge detection device according to an embodiment of the present invention;
fig. 9 is a structural diagram of a battery self-discharge detection device according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart of a battery self-discharge detection method according to an embodiment of the present invention, as shown in fig. 1, including the following steps:
102, performing linear fitting on the N two-dimensional space point coordinates to obtain a fitting straight line;
and 103, judging whether the self-discharge size of the battery is abnormal or not according to the fitted straight line.
Wherein the acquiring may be a measurement; the battery may be a battery that is not mounted on the electronic device, or may be a battery that is already mounted on the electronic device, for example, a battery on a mobile terminal. The above-mentioned obtaining the open-circuit voltage of the battery at N times may be to record the open-circuit voltage of the battery at N times respectively, so as to obtain N open-circuit voltages corresponding to the N times.
The magnitude of the self-discharge can be measured by a voltage drop value (i.e., an absolute value of a voltage difference) caused by the self-discharge per unit time, for example, when the voltage drop value caused by the self-discharge per unit time is greater than or equal to a certain value, it indicates that the magnitude of the self-discharge is abnormal. The magnitude of the self-discharge can also be measured by the self-discharge rate, for example, when the self-discharge rate is greater than or equal to a certain value, it indicates that the magnitude of the self-discharge is abnormal.
The battery self-discharge detection method in the embodiment of the invention can be applied to a screening scene of the battery, and also can be applied to a battery management and early warning scene of the mobile terminal, and the embodiment of the invention is not limited.
According to the embodiment of the invention, the open-circuit voltage under N moments can be obtained only by idling the battery for a short time, and then the self-discharge condition of the battery is judged through linear fitting, so that the detection time required by the self-discharge detection of the battery is greatly shortened, and the self-discharge detection efficiency of the battery is improved.
Optionally, the step of obtaining the open-circuit voltage of the battery at N times includes:
the method includes acquiring an open-circuit voltage of the battery at N times when a temperature of the battery is within a preset temperature range, an SOC (state of charge) of the battery is within a preset charge range, and a current flowing through the battery is less than or equal to a preset current threshold.
The temperature of the battery is within a preset temperature range, which may mean that the temperature of the battery is between 20 ℃ and 30 ℃, that is, the temperature of the battery is greater than or equal to 20 ℃ and less than or equal to 30 ℃. The SOC of the battery is within a preset charge range, which may mean that the SOC of the battery is between 0.4 and 0.6, that is, the SOC of the battery is greater than or equal to 0.4 and less than or equal to 0.6; it may also mean that the SOC of the battery is between 0.47 and 0.53, that is, the SOC of the battery is greater than or equal to 0.47 and less than or equal to 0.53.
The current flowing through the battery may be a charging current or a discharging current of the battery of the mobile terminal; the current flowing through the battery is less than or equal to the preset current threshold value, which means that the charging current or the discharging current of the battery is less than or equal to one tenth of the rated capacity of the battery (i.e. the charging current or the discharging current of the battery is less than or equal to 0.1C).
Therefore, the open-circuit voltage of the battery at N moments is obtained under the condition that the battery meets the conditions, and the self-current test result of the battery can be more accurate.
Optionally, after the step of determining whether the self-discharge size of the battery is abnormal according to the fitted straight line, the method further includes:
and if the self-discharge of the battery is judged to be abnormal, outputting an alarm signal.
The alarm signal may be a message for prompting the tester or the user that the self-discharge of the battery is abnormal; the form of the alarm signal may be a sound form or a text form, and is not limited herein.
Therefore, the output alarm signal can remind a tester or a user of the abnormal self-discharge of the battery, so that the tester or the user can take relevant measures in time to avoid the battery swelling caused by the abnormal self-discharge, and further the screening quality of the battery is improved or the service life of the battery is prolonged.
Referring to fig. 2, fig. 2 is a flowchart of a battery self-discharge detection method according to another embodiment of the present invention, as shown in fig. 2, including the following steps:
202, performing linear fitting on the N two-dimensional space point coordinates to obtain a fitting straight line;
and 204, if the estimated open-circuit voltage is smaller than a preset open-circuit voltage threshold, judging that the self-discharge size of the battery is abnormal.
For the above obtaining, the above battery, the above obtaining the open-circuit voltage of the battery at N times, and the above self-discharge magnitude, please refer to the explanation of corresponding parts in the corresponding embodiment of fig. 1, and thus, details are not repeated here.
The target time and the preset open-circuit voltage threshold may be both a time and a voltage value set according to the requirements of the customer, for example, if the customer requires that the voltage of the battery after being idle for 30 days is not lower than 3.8 v, the target time may be 30 days, and the preset open-circuit voltage threshold may be 3.8 v. The obtaining of one fitting straight line may be an analytical expression of obtaining one fitting straight line; the calculating of the estimated open-circuit voltage at the target time according to the fitted straight line may be performed by substituting the target time into an analytic expression of the fitted straight line according to the analytic expression of the fitted straight line to calculate the estimated open-circuit voltage at the target time.
According to the embodiment of the invention, the open-circuit voltage under N moments can be obtained only by leaving the battery idle for a short time, and then the self-discharge condition of the battery is judged through linear fitting, so that the detection time required by the self-discharge detection of the battery is greatly shortened, and the self-discharge detection efficiency of the battery is improved; since the estimated open-circuit voltage at the target time can be calculated, the present embodiment can also be used to predict the voltage value of the battery under long-term idling.
Optionally, the step of obtaining the open-circuit voltage of the battery at N times includes:
and acquiring the open-circuit voltage of the battery at N moments when the temperature of the battery is within a preset temperature range, the SOC of the battery is within a preset charge range, and the current flowing through the battery is smaller than or equal to a preset current threshold.
The description of the optional step may refer to the explanation of the corresponding part in the embodiment of fig. 1, and thus is not repeated here.
Therefore, the open-circuit voltage of the battery at N moments is obtained under the condition that the battery meets the conditions, and the self-current test result of the battery can be more accurate.
Optionally, after the step of determining whether the self-discharge size of the battery is abnormal according to the fitted straight line, the method further includes:
and if the self-discharge of the battery is judged to be abnormal, outputting an alarm signal.
The alarm signal may be a message for prompting the tester or the user that the self-discharge of the battery is abnormal; the form of the alarm signal may be a sound form or a text form, and is not limited herein.
Therefore, the output alarm signal can remind a tester or a user of the abnormal self-discharge of the battery, so that the tester or the user can take relevant measures in time to avoid the battery swelling caused by the abnormal self-discharge, and further the screening quality of the battery is improved or the service life of the battery is prolonged.
Here, a single battery (i.e., a battery not installed in any electronic device) is taken as an example of a battery to be tested, and it is assumed that the battery to be tested is composed of an anode, a cathode, an electrolyte, a separator and an aluminum plastic film, and is manufactured through a series of processes such as formation and aging, wherein the cathode is formed by mixing 97% of LiCoO2+ 1.6% of PVDF + 1.4% of SP, the anode is formed by mixing 97.7% of artificial graphite + 1.0% of SBR and 1.3% of CMC, the separator is a PE film, and the electrolyte is formed by mixing a certain proportion of an organic solvent and an additive and LiPF 6; the customer requests for the battery that the open circuit voltage after the battery with initial SOC of 0.5 is left idle for 30 days is not less than 3.84 v when the temperature is between 22 ℃ and 28 ℃ and the Humidity is between 0.45RH (Relative Humidity) and 0.85RH, and the method comprises the following steps:
1) under the condition that the initial SOC of the battery to be tested is 0.5 (the battery voltage corresponding to the SOC is 3.91 volts), the battery to be tested is idle in the environment with the temperature of 22-28 ℃ and the humidity of 0.45 RH-0.85 RH, the open-circuit voltages of the battery to be tested on the first day, the second day and the third day are respectively 3.886 volts, 3.883 volts and 3.882 volts, and 3 two-dimensional space point coordinates (1, 3.886), (2, 3.883) and (3, 3.882) corresponding to the open-circuit voltages at the moment in one-to-one mode are obtained;
2) performing linear fitting on the 3 two-dimensional space point coordinates (1, 3.886), (2, 3.883) and (3, 3.882) to obtain a fitted straight line (see fig. 3);
3) according to the obtained fitting straight line, the estimated open circuit voltage at the target moment, namely 30 days is calculated to be 3.8277V;
4) comparing the estimated open-circuit voltage (3.8277V) with a preset open-circuit voltage threshold (3.84V) to obtain a judgment result that the estimated open-circuit voltage is smaller than the preset open-circuit voltage threshold, and judging that the self-discharge of the battery to be tested is abnormal according to the judgment result that the estimated open-circuit voltage is smaller than the preset open-circuit voltage threshold;
5) and outputting an alarm signal according to the judgment result that the self-discharge of the battery to be tested is abnormal.
Referring to fig. 4, fig. 4 is a flowchart of a battery self-discharge detection method according to another embodiment of the present invention, as shown in fig. 4, including the following steps:
and step 403, if the absolute value of the slope of the first fitting straight line is smaller than the absolute value of the slope of the second fitting straight line, determining that the self-discharge magnitude of the battery is abnormal.
For the above obtaining, the above battery, the above obtaining the open-circuit voltage of the battery at N times, and the above self-discharge magnitude, please refer to the explanation of corresponding parts in the corresponding embodiment of fig. 1, and thus, details are not repeated here.
The M two-dimensional space point coordinates in which the time points in the N two-dimensional space point coordinates are arranged in front may be M two-dimensional space point coordinates corresponding to M time points in the front when the N time points are arranged in turn according to the order of the time points, i.e., the sequence; the M two-dimensional space point coordinates at which the time points in the N two-dimensional space point coordinates are arranged later may be M two-dimensional space point coordinates corresponding to M time points at which the M time points are arranged most later when the N time points are arranged in sequence according to the order of the time points. For example, assuming that open-circuit voltages at 4 times are acquired, and the 4 times are the second hour, the fourth hour, the sixth hour, and the eighth hour, respectively, and M is 3, then 3 two-dimensional spatial point coordinates in which the times of the 4 two-dimensional spatial point coordinates are arranged in the front are 3 two-dimensional spatial point coordinates corresponding to the second hour, the fourth hour, and the sixth hour, and 3 two-dimensional spatial point coordinates in which the times of the 4 two-dimensional spatial point coordinates are arranged in the rear are 3 two-dimensional spatial point coordinates corresponding to the fourth hour, the sixth hour, and the eighth hour at this time.
According to the embodiment of the invention, the open-circuit voltage under N moments can be obtained only by idling the battery for a short time, and then the self-discharge condition of the battery is judged through linear fitting, so that the detection time required by the self-discharge detection of the battery is greatly shortened, and the self-discharge detection efficiency of the battery is improved.
Optionally, the step of obtaining the open-circuit voltage of the battery at N times includes:
and acquiring the open-circuit voltage of the battery at N moments when the temperature of the battery is within a preset temperature range, the SOC of the battery is within a preset charge range, and the current flowing through the battery is smaller than or equal to a preset current threshold.
The description of the optional step may refer to the explanation of the corresponding part in the embodiment of fig. 1, and thus is not repeated here.
Therefore, the open-circuit voltage of the battery at N moments is obtained under the condition that the battery meets the conditions, and the self-current test result of the battery can be more accurate.
Optionally, after the step of determining whether the self-discharge size of the battery is abnormal according to the fitted straight line, the method further includes:
and if the self-discharge of the battery is judged to be abnormal, outputting an alarm signal.
The alarm signal may be a message for prompting the tester or the user that the self-discharge of the battery is abnormal; the form of the alarm signal may be a sound form or a text form, and is not limited herein.
Therefore, the output alarm signal can remind a tester or a user of the abnormal self-discharge of the battery, so that the tester or the user can take relevant measures in time to avoid the battery swelling caused by the abnormal self-discharge, and further the screening quality of the battery is improved or the service life of the battery is prolonged.
Taking the battery of the mobile terminal a (i.e. the battery already installed in the mobile terminal) as an example of the battery to be tested, the method includes the following steps:
1) in the case where the temperature of the battery under test is between 20 ℃ and 30 ℃, the SOC of the battery under test is between 0.47 and 0.53, and the charging current or the discharging current of the battery under test is less than or equal to 0.1C, T is acquired sequentially (i.e., in the order of morning and evening of the time of day)n-1Time, TnTime, Tn+1Time and Tn+2Open-circuit voltage OCV of battery to be tested at momentn-1、OCVn、OCVn+1And OCVn+2Obtaining 4 two-dimensional space point coordinates (T) with time corresponding to open-circuit voltage one by onen-1，OCVn-1)、(Tn，OCVn)、(Tn+1，OCVn+1) And (T)n+2，OCVn+2)；
2) The first 3 two-dimensional space point coordinates (T) of the 4 two-dimensional space point coordinatesn-1，OCVn-1)、(Tn，OCVn) And (T)n+1，OCVn+1) Linear fitting is carried out to obtain a first fitting straight line L1(see fig. 5); and 3 two-dimensional space point coordinates (T) arranged at the rear of the time in the 4 two-dimensional space point coordinatesn，OCVn)、(Tn+1，OCVn+1) And (T)n+2，OCVn+2) Performing linear fitting to obtain a second fitting straight line L2(see fig. 5);
3) if the first fitted straight line L1Is smaller than the second fitted straight line L2The absolute value of the slope of (a) is determined, it is determined that the self-discharge magnitude of the battery is abnormal.
Referring to fig. 6, fig. 6 is a structural diagram of a battery self-discharge detection apparatus according to an embodiment of the present invention, and as shown in fig. 6, the battery self-discharge detection apparatus 600 includes:
an obtaining module 601, configured to obtain open-circuit voltages of the battery at N times, and obtain N two-dimensional space point coordinates at the times corresponding to the open-circuit voltages one to one, where N is an integer greater than or equal to 2;
a linear fitting module 602, configured to perform linear fitting on the N two-dimensional space point coordinates to obtain a fitted straight line;
and a determining module 603, configured to determine whether the self-discharge size of the battery is abnormal according to the fitted straight line.
Optionally, the linear fitting module 602 is configured to perform linear fitting on the N two-dimensional space point coordinates to obtain a fitting straight line;
as shown in fig. 7, the determining module 603 includes:
a calculating unit 6031, configured to calculate, according to the one fitted straight line, an estimated open-circuit voltage at the target time;
a determination unit 6032 configured to determine that the self-discharge magnitude of the battery is abnormal if the estimated open-circuit voltage is smaller than a preset open-circuit voltage threshold.
Optionally, N is an integer greater than or equal to 3;
the linear fitting module 602 is configured to perform linear fitting on M two-dimensional space point coordinates arranged at a previous moment and M two-dimensional space point coordinates arranged at a subsequent moment in the N two-dimensional space point coordinates, respectively, to obtain a first fitted straight line and a second fitted straight line, where M is an integer greater than or equal to N-halved and less than N;
the determining module 603 is configured to determine that the self-discharge magnitude of the battery is abnormal if the absolute value of the slope of the first fitted straight line is smaller than the absolute value of the slope of the second fitted straight line.
Optionally, the obtaining module 601 is configured to obtain the open-circuit voltage of the battery at N times when the temperature of the battery is within a preset temperature range, the state of charge SOC of the battery is within a preset charge range, and the current flowing through the battery is less than or equal to a preset current threshold.
Optionally, as shown in fig. 8, the apparatus 600 further includes:
and the alarm module 604 outputs an alarm signal if the self-discharge magnitude of the battery is judged to be abnormal.
Optionally, the battery self-discharge detection apparatus 600 is a mobile terminal, and the battery is a battery of the mobile terminal.
The Mobile terminal may be a Mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), a Wearable Device (Wearable Device), or the like.
The battery self-discharge detection apparatus 600 can implement each process implemented by the battery self-discharge detection apparatus 600 in the method embodiments of fig. 1 to fig. 5, and is not described herein again to avoid repetition.
According to the battery self-discharge detection device 600 provided by the embodiment of the invention, the open-circuit voltage at N moments can be obtained only by idling the battery for a short time, and then the self-discharge condition of the battery is judged through linear fitting, so that the detection time required by the self-discharge detection of the battery is greatly shortened, and the self-discharge detection efficiency of the battery is further improved.
Fig. 9 is a schematic diagram of a hardware structure of a battery self-discharge detection apparatus for implementing various embodiments of the present invention, where the battery self-discharge detection apparatus 900 includes, but is not limited to: a radio frequency unit 901, a network module 902, an audio output unit 903, an input unit 904, a sensor 905, a display unit 906, a user input unit 907, an interface unit 908, a memory 909, a processor 910, and a power supply 911. It will be understood by those skilled in the art that the battery self-discharge detection device configuration shown in fig. 9 does not constitute a limitation of the battery self-discharge detection device, and the battery self-discharge detection device may include more or less components than those shown, or some components may be combined, or a different arrangement of components. In the embodiment of the present invention, the battery self-discharge detection device may be a mobile terminal, including but not limited to a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted terminal, a wearable device, a pedometer, and the like.
Wherein, the processor 910 is configured to:
acquiring open-circuit voltages of the battery at N moments to obtain N two-dimensional space point coordinates corresponding to the open-circuit voltages one by one, wherein N is an integer greater than or equal to 2;
performing linear fitting on the N two-dimensional space point coordinates to obtain a fitting straight line;
and judging whether the self-discharge size of the battery is abnormal or not according to the fitted straight line.
Optionally, the step of performing linear fitting on the N two-dimensional space point coordinates by the processor 910 to obtain a fitted straight line includes:
performing linear fitting on the N two-dimensional space point coordinates to obtain a fitting straight line;
the step of determining whether the self-discharge size of the battery is abnormal according to the fitted straight line, which is executed by processor 910, includes:
calculating the estimated open-circuit voltage at the target moment according to the fitted straight line;
and if the estimated open-circuit voltage is smaller than a preset open-circuit voltage threshold value, judging that the self-discharge size of the battery is abnormal.
Optionally, N is an integer greater than or equal to 3;
the step of performing linear fitting on the N two-dimensional space point coordinates by processor 910 to obtain a fitted straight line includes:
respectively performing linear fitting on M two-dimensional space point coordinates arranged at the front moment and M two-dimensional space point coordinates arranged at the back moment in the N two-dimensional space point coordinates to respectively obtain a first fitting straight line and a second fitting straight line, wherein M is an integer which is more than or equal to half N and less than N;
the step of determining whether the self-discharge size of the battery is abnormal according to the fitted straight line, which is executed by processor 910, includes:
and if the absolute value of the slope of the first fitting straight line is smaller than the absolute value of the slope of the second fitting straight line, judging that the self-discharge magnitude of the battery is abnormal.
Optionally, the step of obtaining the open circuit voltage of the battery at N times performed by the processor 910 includes:
and acquiring the open-circuit voltage of the battery at N moments when the temperature of the battery is within a preset temperature range, the SOC of the battery is within a preset SOC range, and the current flowing through the battery is less than or equal to a preset current threshold.
Optionally, the processor 910 is further configured to:
and if the self-discharge of the battery is judged to be abnormal, outputting an alarm signal.
The battery self-discharge detection apparatus 900 can implement the processes implemented by the battery self-discharge detection apparatus in the foregoing embodiments, and for avoiding repetition, the detailed description is omitted here.
According to the battery self-discharge detection device 900 provided by the embodiment of the invention, the open-circuit voltage at N moments can be obtained only by idling the battery for a short time, and then the self-discharge condition of the battery is judged through linear fitting, so that the detection time required by the self-discharge detection of the battery is greatly shortened, and the self-discharge detection efficiency of the battery is further improved.
It should be understood that, in the embodiment of the present invention, the radio frequency unit 901 may be used for receiving and sending signals during a message transmission and reception process or a call process, and specifically, after receiving downlink data from a base station, the downlink data is processed by the processor 910; in addition, the uplink data is transmitted to the base station. Generally, the radio frequency unit 901 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio frequency unit 901 can also communicate with a network and other devices through a wireless communication system.
The battery self-discharge detection device provides wireless broadband internet access to the user through the network module 902, such as helping the user send and receive e-mails, browse webpages, access streaming media, and the like.
The audio output unit 903 may convert audio data received by the radio frequency unit 901 or the network module 902 or stored in the memory 909 into an audio signal and output as sound. Also, the audio output unit 903 may also provide audio output related to a specific function performed by the battery self-discharge detection apparatus 900 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output unit 903 includes a speaker, a buzzer, a receiver, and the like.
The input unit 904 is used to receive audio or video signals. The input Unit 904 may include a Graphics Processing Unit (GPU) 9041 and a microphone 9042, and the Graphics processor 9041 processes image data of a still picture or video obtained by an image capturing device (such as a camera) in a video capture mode or an image capture mode. The processed image frames may be displayed on the display unit 906. The image frames processed by the graphic processor 9041 may be stored in the memory 909 (or other storage medium) or transmitted via the radio frequency unit 901 or the network module 902. The microphone 9042 can receive sounds and can process such sounds into audio data. The processed audio data may be converted into a format output transmittable to a mobile communication base station via the radio frequency unit 901 in case of the phone call mode.
The battery self-discharge detection device 900 also includes at least one sensor 905, such as a light sensor, motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor that can adjust the brightness of the display panel 9061 according to the brightness of ambient light, and a proximity sensor that can turn off the display panel 9061 and/or backlight when the battery moves from the discharge detection device 900 to the ear. As one type of motion sensor, an accelerometer sensor can detect the magnitude of acceleration in each direction (generally three axes), detect the magnitude and direction of gravity when stationary, and can be used to identify the posture of a battery self-discharge detection device (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), and vibration identification related functions (such as pedometer and tapping); the sensors 905 may also include a fingerprint sensor, a pressure sensor, an iris sensor, a molecular sensor, a gyroscope, a barometer, a hygrometer, a thermometer, an infrared sensor, etc., which are not described in detail herein.
The display unit 906 is used to display information input by the user or information provided to the user. The Display unit 906 may include a Display panel 9061, and the Display panel 9061 may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like.
The user input unit 907 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the battery self-discharge detection apparatus. Specifically, the user input unit 907 includes a touch panel 9071 and other input devices 9072. The touch panel 9071, also referred to as a touch screen, may collect touch operations by a user on or near the touch panel 9071 (e.g., operations by a user on or near the touch panel 9071 using a finger, a stylus, or any other suitable object or accessory). The touch panel 9071 may include two parts, a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 910, receives a command from the processor 710, and executes the command. In addition, the touch panel 9071 may be implemented by using various types such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave. The user input unit 907 may include other input devices 9072 in addition to the touch panel 9071. Specifically, the other input devices 9072 may include, but are not limited to, a physical keyboard, function keys (such as a volume control key, a switch key, and the like), a track ball, a mouse, and a joystick, which are not described herein again.
Further, the touch panel 9071 may be overlaid on the display panel 9061, and when the touch panel 9071 detects a touch operation on or near the touch panel 9071, the touch panel is transmitted to the processor 910 to determine the type of the touch event, and then the processor 910 provides a corresponding visual output on the display panel 9061 according to the type of the touch event. Although in fig. 9, the touch panel 9071 and the display panel 9061 are two independent components to implement the input and output functions of the battery self-discharge detection apparatus, in some embodiments, the touch panel 9071 and the display panel 9061 may be integrated to implement the input and output functions of the battery self-discharge detection apparatus, which is not limited herein.
The interface unit 908 is an interface for connecting an external device to the battery self-discharge detection device 900. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. The interface unit 908 may be used to receive input (e.g., data information, power, etc.) from an external device and transmit the received input to one or more elements within the battery self-discharge detection device 900 or may be used to transmit data between the battery self-discharge detection device 900 and an external device.
The memory 909 may be used to store software programs as well as various data. The memory 909 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. Further, the memory 909 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage device.
The processor 910 is a control center of the battery self-discharge detection apparatus, connects various parts of the entire battery self-discharge detection apparatus using various interfaces and lines, and performs various functions of the battery self-discharge detection apparatus and processes data by running or executing software programs and/or modules stored in the memory 909 and calling data stored in the memory 909, thereby performing overall monitoring of the battery self-discharge detection apparatus. Processor 910 may include one or more processing units; preferably, the processor 910 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It is to be appreciated that the modem processor described above may not be integrated into processor 910.
The battery self-discharge detection apparatus 900 may further include a power supply 911 (such as a battery) for supplying power to each component, and preferably, the power supply 911 may be logically connected to the processor 910 through a power management system, so as to implement functions of managing charging, discharging, and power consumption through the power management system.
In addition, the battery self-discharge detection apparatus 900 includes some functional modules that are not shown, and are not described herein again.
Preferably, an embodiment of the present invention further provides a battery self-discharge detection apparatus, including a processor 910, a memory 909, and a computer program stored in the memory 909 and capable of running on the processor 910, where the computer program, when executed by the processor 910, implements each process of the above-mentioned battery self-discharge detection method embodiment, and can achieve the same technical effect, and in order to avoid repetition, it is not described herein again.
The embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process of the above-mentioned battery self-discharge detection method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
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.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A method for detecting battery self-discharge, comprising:
acquiring open-circuit voltage of the battery at N moments to obtain N two-dimensional space point coordinates corresponding to the open-circuit voltage one by one at the moment;
performing linear fitting on the N two-dimensional space point coordinates to obtain a fitting straight line;
judging whether the self-discharge size of the battery is abnormal or not according to the fitted straight line;
wherein N is an integer greater than or equal to 3;
the step of performing linear fitting on the N two-dimensional space point coordinates to obtain a fitted straight line includes:
respectively performing linear fitting on M two-dimensional space point coordinates arranged at the front moment and M two-dimensional space point coordinates arranged at the back moment in the N two-dimensional space point coordinates to respectively obtain a first fitting straight line and a second fitting straight line, wherein M is an integer which is more than or equal to half N and less than N;
the step of judging whether the self-discharge size of the battery is abnormal or not according to the fitted straight line comprises the following steps of:
and if the absolute value of the slope of the first fitting straight line is smaller than the absolute value of the slope of the second fitting straight line, judging that the self-discharge magnitude of the battery is abnormal.
2. The method of claim 1, wherein the step of obtaining the open circuit voltage of the battery at N times comprises:
and acquiring the open-circuit voltage of the battery at N moments when the temperature of the battery is within a preset temperature range, the SOC of the battery is within a preset SOC range, and the current flowing through the battery is less than or equal to a preset current threshold.
3. The method according to any one of claims 1 to 2, further comprising, after the step of determining whether the self-discharge magnitude of the battery is abnormal from the fitted straight line,:
and if the self-discharge of the battery is judged to be abnormal, outputting an alarm signal.
4. A battery self-discharge detection device, comprising:
the acquisition module is used for acquiring the open-circuit voltage of the battery at N moments to obtain N two-dimensional space point coordinates corresponding to the open-circuit voltage one by one at the moment;
the linear fitting module is used for performing linear fitting on the N two-dimensional space point coordinates to obtain a fitting straight line;
the judging module is used for judging whether the self-discharge size of the battery is abnormal or not according to the fitted straight line;
wherein N is an integer greater than or equal to 3;
the linear fitting module is used for respectively performing linear fitting on M two-dimensional space point coordinates which are arranged at the front moment and M two-dimensional space point coordinates which are arranged at the back moment in the N two-dimensional space point coordinates to respectively obtain a first fitting straight line and a second fitting straight line, wherein M is an integer which is more than or equal to two-half N and less than N;
the judgment module is used for judging that the self-discharge magnitude of the battery is abnormal if the absolute value of the slope of the first fitting straight line is smaller than the absolute value of the slope of the second fitting straight line.
5. The device according to claim 4, wherein the obtaining module is configured to obtain the open-circuit voltage of the battery at N moments when the temperature of the battery is within a preset temperature range, the state of charge (SOC) of the battery is within a preset SOC range, and the current flowing through the battery is less than or equal to a preset current threshold.
6. The apparatus of any of claims 4 to 5, further comprising:
and the alarm module outputs an alarm signal if the self-discharge magnitude of the battery is judged to be abnormal.
7. The battery self-discharge detection device according to claim 4, wherein the battery self-discharge detection device is a mobile terminal, and the battery is a battery of the mobile terminal.
8. A battery self-discharge detection apparatus comprising a processor, a memory and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the battery self-discharge detection method according to any one of claims 1 to 3.
9. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, carries out the steps of the battery self-discharge detection method according to any one of claims 1 to 3.
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| CN111361448A (en) * | 2020-03-19 | 2020-07-03 | 一汽解放汽车有限公司 | Self-discharge detection method and device of battery, battery controller and storage medium |
| CN111458644A (en) * | 2020-05-12 | 2020-07-28 | 安徽优旦科技有限公司 | Discharge detection system of new energy battery |
| CN112748347B (en) * | 2020-12-30 | 2023-08-25 | 北京二郎神科技有限公司 | Battery electric quantity acquisition method and device, storage medium and electronic equipment |
| CN113466714B (en) * | 2021-07-29 | 2024-02-06 | 河南省鹏辉电源有限公司 | Lithium battery self-discharge rate evaluation method and device and computer equipment |
| CN113406502B (en) * | 2021-08-19 | 2021-12-07 | 四川新能源汽车创新中心有限公司 | Defective battery screening method, apparatus and medium based on machine learning |
| CN114325407B (en) * | 2021-12-31 | 2023-08-22 | 珠海冠宇电池股份有限公司 | Battery self-discharge test method, device, equipment and computer storage medium |
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