CN111896877B - Battery detection method, device, electronic equipment and storage medium - Google Patents
Battery detection method, device, electronic equipment and storage medium Download PDFInfo
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- CN111896877B CN111896877B CN202010760414.XA CN202010760414A CN111896877B CN 111896877 B CN111896877 B CN 111896877B CN 202010760414 A CN202010760414 A CN 202010760414A CN 111896877 B CN111896877 B CN 111896877B
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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
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
- G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
According to the battery detection method, the device, the electronic equipment and the storage medium, battery standing information corresponding to the discharging depth of the battery is obtained, whether the current charging current of the battery exceeds the maximum charging current bearable under the discharging depth is judged according to the battery standing information, whether the current charging current of the lithium metal battery exceeds the maximum charging current bearable under the discharging depth is detected according to the battery standing information, and therefore safe charging of the lithium metal battery is guaranteed.
Description
Technical Field
The present disclosure relates to the field of battery charging, and in particular, to a battery detection method, apparatus, electronic device, and storage medium.
Background
The "lithium battery" is a battery using a nonaqueous electrolyte solution, which uses lithium metal or a lithium alloy as a negative electrode material. Lithium batteries can be broadly divided into two categories: lithium metal batteries and lithium ion batteries. With a great increase in battery energy density, lithium metal batteries are also gradually beginning to be used.
In order to ensure the safety during the battery charging process and to prolong the service life of the battery, it is often necessary to detect whether the current charging current exceeds the maximum charging current that the battery can withstand under the electric quantity during the battery charging process, so as to adjust the charging current. For lithium batteries, once lithium dendrites appear, they may react with the electrolyte inside and puncture the separator to cause internal short circuits, thereby consuming the electrolyte and releasing a lot of heat, creating safety problems. Therefore, a common detection method is to detect whether the lithium metal dendrite is precipitated from the lithium battery, and determine whether the current charging current exceeds the maximum charging current that the battery can withstand under the electric quantity according to the detection result, for example, if the lithium metal dendrite is detected to be precipitated from the lithium battery, the current charging current is considered to exceed the maximum charging current that the battery can withstand under the electric quantity.
However, for the lithium metal battery, the detection method cannot determine whether the current charging current exceeds the maximum charging current under the electric quantity, so that a certain safety risk exists in the charging process of the lithium metal battery.
Disclosure of Invention
The embodiment of the application provides a battery detection method, a device, electronic equipment and a storage medium, which can judge whether the current charging current exceeds the maximum charging current under the electric quantity or not, and ensure the safe charging of a battery.
A battery detection method, comprising:
obtaining battery standing information corresponding to the discharging depth of the battery; the battery standing information comprises relevant information that the battery is charged to the discharging depth and then stands until the voltage is stable;
and judging whether the current charging current of the battery exceeds the maximum charging current according to the battery standing information, wherein the maximum charging current is the maximum charging current which can be born by the battery under the depth of discharge.
In one embodiment, the battery rest information includes a stable voltage corresponding to the depth of discharge, the stable voltage being a stable voltage after the battery is charged to the depth of discharge;
judging whether the current charging current of the battery exceeds the maximum charging current according to the battery standing information, including:
Determining a target open circuit voltage corresponding to the depth of discharge of the battery according to the corresponding relation between the depth of discharge and the open circuit voltage;
and judging whether the current charging current of the battery exceeds the maximum charging current according to the target open-circuit voltage and the stable voltage.
In one embodiment, the determining whether the present charging current of the battery exceeds the maximum charging current according to the target open circuit voltage and the stable voltage includes:
obtaining a voltage difference value obtained by subtracting the target open-circuit voltage from the stable voltage;
and if the voltage difference is smaller than a preset difference threshold, determining that the current charging current of the battery exceeds the maximum charging current.
In one embodiment, the determining whether the present charging current of the battery exceeds the maximum charging current according to the target open circuit voltage and the stable voltage includes:
and if the stable voltage is larger than the target open-circuit voltage, determining that the current charging current of the battery exceeds the maximum charging current.
In one embodiment, the method further comprises:
in the battery charging process, time integration is carried out on the charging current to obtain the capacity of the accumulated charged battery at each charging moment;
Accumulating the ratio of the capacity of the charged battery to the maximum capacity of the battery at each charging moment, and determining the residual electric quantity of the battery at each charging moment;
determining the charging depth of the battery at each charging moment according to the residual electric quantity of the battery at each charging moment;
detecting the voltage of the battery at each charging moment;
and establishing a corresponding relation between the depth of discharge and the open-circuit voltage according to the depth of charge of the battery at each charging moment and the voltage of the battery at each charging moment.
In one embodiment, the obtaining the battery standing information corresponding to the depth of discharge of the battery includes:
when the battery is detected to be charged to the discharging depth, standing the battery, and detecting the voltage variation amplitude value of the battery;
and when the voltage variation amplitude value is smaller than a preset amplitude threshold value, acquiring the current voltage of the battery as the stable voltage.
In one embodiment, the battery rest information includes an actual rest duration corresponding to the depth of discharge, where the actual rest duration is a duration required for the battery to rest until the voltage is stable after the battery is charged to the depth of discharge;
Judging whether the current charging current of the battery exceeds the maximum charging current according to the battery standing information, including:
determining a target standing time length corresponding to the discharging depth of the battery according to the corresponding relation between the discharging depth and the standing time length;
and if the actual standing time length corresponding to the discharging depth is longer than the target standing time length, determining that the current charging current of the battery exceeds the maximum charging current.
In one embodiment, the method further comprises:
acquiring the time length from the start of standing to the time when the voltage of the battery reaches the open circuit voltage corresponding to each circuit depth under different discharging depths;
and establishing a corresponding relation between the depth of discharge and the standing time according to the different depths of discharge and the corresponding time.
In one embodiment, the obtaining the battery standing information corresponding to the depth of discharge of the battery includes:
and determining the actual standing time length corresponding to the discharging depth according to the current charging current of the battery and the current capacity of the battery.
In one embodiment, the obtaining the battery standing information corresponding to the depth of discharge of the battery includes:
And in the process of standing the battery, when the voltage stability of the battery is detected, determining the standing time length corresponding to the discharging depth according to the standing starting time and the voltage stability time.
In one embodiment, the method further comprises:
acquiring the current capacity of the battery;
determining the ratio of the current capacity of the battery to the maximum capacity of the battery as the residual electric quantity of the battery;
and obtaining the discharge depth of the battery according to the residual electric quantity.
A battery detection device, comprising:
the acquisition module is used for acquiring battery standing information corresponding to the discharging depth of the battery; the battery standing information comprises relevant information that the battery is charged to the discharging depth and then stands until the voltage is stable;
and the judging module is used for judging whether the current charging current of the battery exceeds the maximum charging current according to the battery standing information, wherein the maximum charging current is the maximum charging current which can be born by the battery under the depth of discharge.
An electronic device includes a memory and a processor, wherein the memory stores a computer program, and the computer program, when executed by the processor, causes the processor to execute the steps of the battery detection method described in the foregoing embodiments.
A computer readable storage medium having stored thereon a computer program, characterized in that the computer program is executed by a processor for performing the steps of the method according to the above-mentioned embodiments.
According to the battery detection method, the device, the electronic equipment and the storage medium, the battery standing information corresponding to the discharging depth of the battery is obtained, whether the current charging current of the battery exceeds the maximum charging current which can be born under the discharging depth is judged according to the battery standing information.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a diagram of an application environment for a battery detection method in one embodiment;
FIG. 2 is a flow chart of a method of battery detection in one embodiment;
FIG. 3 is a flow chart of a method of battery detection in one embodiment;
FIG. 4 is a flow chart of a method of battery detection in one embodiment;
FIG. 5 is a graph showing the correspondence between the discharge depth and the open circuit voltage in one embodiment;
FIG. 6 is a flow chart of a method of battery detection in one embodiment;
FIG. 7 is a block diagram of a battery detection device in one embodiment;
fig. 8 is a schematic diagram of an internal structure of an electronic device in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
Lithium metal batteries, i.e., batteries employing either liquid or solid electrolytes, employ lithium metal elements instead of conventional graphite as the negative electrode of the battery. Since the theoretical specific capacity of lithium metal is very high while the mass is light, a very considerable increase in energy density can be brought about.
However, in the conventional charging mode, particularly in the fast charging mode, it is generally determined whether the current charging current exceeds the maximum charging current that the battery can withstand under the electric quantity by detecting whether the battery precipitates lithium metal dendrite, because the lithium metal dendrite may react with the internal electrolyte once it occurs, and the internal short circuit is caused by puncturing the separator, thereby consuming the electrolyte to release a large amount of heat, and creating a safety problem.
However, in the lithium metal battery, a simple lithium metal is precipitated at the negative electrode during the charging process, so that the conventional method cannot determine whether the charging current exceeds the maximum charging current under the electric quantity. If the current is too large, the local lithium simple substance forms columnar dendrites to puncture the diaphragm, so that the safety problem of short circuit occurs, and a certain safety risk exists in the charging process of the lithium metal battery.
The embodiment of the application provides a battery detection method, which can solve the technical problem that the detection method cannot judge whether the current charging current exceeds the maximum charging current under the electric quantity for a lithium metal battery, so that a certain safety risk exists in the charging process of the lithium metal battery. It should be noted that, the embodiments of the present application are not limited to solving this technical problem, but may solve other technical problems, and the embodiments of the present application are not limited thereto.
Fig. 1 is a schematic view of an application environment of a battery detection method in an embodiment. As shown in fig. 1, the application environment includes a detection device 1 and a battery 2, where the detection device 1 can detect relevant information of the battery during the charging process of the battery 2, so as to determine whether the current charging current exceeds the maximum charging current that the battery can withstand under the corresponding depth of discharge, thereby obtaining the optimal charging current of the battery. The detection device 1 may be a stand-alone device other than a battery-independent power supply device, or the detection device 1 may be a battery-powered power supply device, i.e. a corresponding detection function may be provided in the battery-powered power supply device. The battery may be a lithium metal battery, a lithium ion battery, or other batteries, and the embodiments of the present application are not limited.
Fig. 2 is a flow chart of a battery detection method in one embodiment. The battery detection method in the present embodiment will be described taking the detection apparatus operating in fig. 1 as an example. As shown in fig. 2, the battery detection method includes:
s201, obtaining battery standing information corresponding to the discharging depth of a battery; the battery rest information includes information about the battery to be kept stationary until the voltage is stabilized after being charged to the depth of discharge.
The depth of discharge may be the current real-time depth of discharge or a preset depth of discharge. The battery standing information may be the current voltage of the battery when the battery reaches the discharge depth and stands to the voltage stabilization, or may be the open-circuit voltage of the battery when the battery stands to the voltage stabilization, or may be the time period required for the battery to stand to the voltage stabilization, etc., which is not limited in the embodiment of the present application.
In this embodiment, the detection device may acquire the battery standing information corresponding to the depth of discharge at each time in real time, or the detection device may acquire the corresponding battery standing information when the battery is charged to a predetermined depth of discharge. For example, the detection device may control the battery to stop charging when the battery is charged to a predetermined depth of discharge, stand the battery until the voltage of the battery stabilizes, detect the current voltage of the battery, or the detection device may control the battery to stop charging when the battery is charged to a predetermined depth of discharge, stand the battery for a certain period of time, and then detect the voltage of the battery; alternatively, the detection device may control the battery to stop charging when the battery is charged to a predetermined depth of discharge, and obtain a period of time for which the battery is left to stand when the battery is left to stand to a predetermined voltage.
S202, judging whether the current charging current of the battery exceeds the maximum charging current according to the battery standing information; the maximum charging current is the maximum charging current that the battery can withstand at the depth of discharge.
In this embodiment, after the detection device acquires the battery standing information, it may be determined whether the present charging current of the battery exceeds the maximum charging current that can be tolerated at the depth of discharge according to the standing information. For example, different detection conditions may be set corresponding to different battery rest information, and when the battery rest information satisfies the corresponding detection conditions, the battery is considered to generate lithium precipitation dendrite, and is irreversible, that is, the current charging current of the battery exceeds the maximum charging current which can be sustained at the depth of discharge.
When the obtained battery standing information is a stable voltage after the battery is standing, judging whether the stable voltage exceeds a set rated voltage threshold, if so, determining that the current charging current of the battery exceeds the maximum charging current bearable under the depth of discharge, namely the charging current is unsafe and may need to be adjusted; otherwise, the present charge current does not exceed the maximum charge current that can be tolerated at this depth of discharge, i.e. the charge current is safe. Or after the battery is charged to a predetermined charging depth, acquiring a time period required for the battery to stand to reach a preset voltage, and if the time period exceeds the preset time period, determining that the current charging current of the battery exceeds a maximum charging current bearable under the discharging depth.
According to the battery detection method, battery standing information corresponding to the discharging depth of the battery is obtained, whether the current charging current of the battery exceeds the maximum charging current which can be born under the discharging depth is judged according to the battery standing information, and for the lithium metal battery, whether the current charging current exceeds the maximum charging current which can be born under the discharging depth is judged without depending on whether lithium metal dendrites appear, but whether the current charging current of the lithium metal battery exceeds the maximum charging current which can be born under the discharging depth is detected according to the battery standing information, so that the lithium metal battery can be safely charged.
Based on the embodiment shown in fig. 2, the detection methods corresponding to different battery rest information are also different, and when the battery rest information includes a stable voltage corresponding to a discharge depth, the specific implementation process of the battery detection method is first analyzed in detail.
In one embodiment, the battery rest information includes a stable voltage corresponding to a depth of discharge, the stable voltage being a stable voltage after the battery is left to rest when the battery is charged to the depth of discharge. As shown in fig. 3, step S202 "determines whether the present charging current of the battery exceeds the maximum charging current according to the battery rest information", including:
S301, determining a target open circuit voltage corresponding to the discharge depth of the battery according to the corresponding relation between the discharge depth and the open circuit voltage.
In this embodiment, a correspondence relationship between the depth of discharge and the open circuit voltage may be established in advance, for example, the battery is charged with a small current (for example, 0.01C) or even lower, and the correspondence relationship between the depth of discharge (Depth of discharge, DOD) and the open circuit voltage (Open circuit voltage, OCV) of the battery is detected from the off-voltage to the full-charge voltage. For example, for a fresh battery, after determining the optimal charging current of the fresh battery, calculating the voltage value corresponding to the fresh battery charged to different DODs and standing until the battery voltage is stable, and because the current value is very small, the voltage value can be approximately regarded as an open circuit voltage SOC, and the corresponding relationship between the DOD and the SOC can be obtained. When the battery is charged to a certain depth of discharge DOD1, a target open circuit voltage OCV1 corresponding to the depth of discharge DOD1 is determined according to the corresponding relation between the depth of discharge and the open circuit voltage.
Alternatively, in one embodiment, step S301 may include: when the battery is detected to be charged to reach the depth of discharge, standing the battery, and detecting the voltage variation amplitude value of the battery; and when the voltage variation amplitude value is smaller than a preset amplitude threshold value, acquiring the current voltage of the battery as a stable voltage.
In this embodiment, during the battery detection process, the battery is charged with different charging currents, for example, the battery is charged to a certain depth of discharge DOD1 with a charging current of 1C, then the charging is stopped, the battery is left to stand to make its voltage stable and unchanged, and the stable voltage is detected. The stable voltage is the voltage when the voltage of the battery is not changed after the battery is kept stand, so that whether the battery generates a lithium metal dendrite phenomenon can be more accurately reflected, and whether the current charging current exceeds the maximum charging current which can be accepted under the capacity can be more accurately judged.
Alternatively, in another embodiment, step S301 may include: when it is detected that the battery is charged to the depth of discharge, after the battery is left for a preset period of time, the voltage of the battery is detected as the stable voltage. The preset time length can be determined according to different battery capacities and charging current, and after the preset time length is passed, the voltage of the battery is stable, the voltage of the battery does not need to be measured in real time, and the power consumption of the detection equipment is reduced.
S302, judging whether the current charging current of the battery exceeds the maximum charging current according to the target open-circuit voltage and the stable voltage.
In this embodiment, it may be determined whether the current charge current of the battery exceeds the maximum charge current according to the target open circuit voltage and the stable voltage after the battery is left standing. For example, it may be determined whether the present charge current of the battery exceeds the maximum charge current according to the magnitude relation of the target open-circuit voltage and the stabilized voltage; it is also possible to judge whether the present charge current of the battery exceeds the maximum charge current according to the difference between the target open-circuit voltage and the stabilized voltage.
Optionally, in one embodiment, step S302 may include: obtaining a voltage difference value obtained by subtracting a target open-circuit voltage from a stable voltage; if the voltage difference is smaller than a preset difference threshold, determining that the current charging current of the battery exceeds the maximum charging current.
In this embodiment, the battery is charged with different charging currents, for example, the battery is charged with a current 1C to a certain depth of discharge DOD1, the battery is left to stand so that the voltage is stable and does not change any more, the difference between the stable voltage V1 in the DOD1 state and the target open circuit voltage OCV1 in the DOD1 state is calculated, if V1-OCV1 is less than or equal to x, it is determined that the charging current does not exceed the maximum charging current acceptable in the DOD1, otherwise, it is determined that lithium dendrite precipitation occurs and is irreversible, and exceeds the maximum charging current acceptable in the DOD. Alternatively, the value of x is not greater than 10uV/s.
Alternatively, in another embodiment, step S302 may include: if the stable voltage is greater than the target open circuit voltage, determining that the current charging current of the battery exceeds the maximum charging current.
In this embodiment, the magnitude relation between the stable voltage and the target open-circuit voltage may be directly determined, so as to determine that the current charging current of the battery exceeds the maximum charging current. For example, when the battery is charged to 40% dod and is kept still to be stable in voltage, the target open circuit voltage is 4.0V, and when the battery is actually detected, the battery is charged to 40% dod and is kept still to be stable in voltage, and if the stable voltage is 3.95V, the current charging current of the battery does not exceed the maximum charging current which can be born at 40% dod; if the regulated voltage is 4.1V, the current charge current of the battery exceeds the maximum charge current that can be tolerated at 40% dod.
According to the battery detection method, the target open-circuit voltage corresponding to the discharge depth of the battery is determined according to the corresponding relation between the discharge depth and the open-circuit voltage, whether the current charging current of the battery exceeds the maximum charging current is judged according to the target open-circuit voltage and the stable voltage, and the maximum charging current of the lithium metal battery is judged by comparing the difference between the target open-circuit voltage and the stable voltage.
Further, on the basis of the embodiment shown in fig. 3, the embodiment in fig. 4 relates to a specific implementation manner of establishing a correspondence between a depth of discharge and an open circuit voltage, and as shown in fig. 4, the method includes:
and S401, in the process of charging the battery, performing time integration on the charging current to obtain the capacity of the accumulated charged battery at each charging moment.
In this embodiment, during the charging process of the battery, the charging current of the battery is integrated in time, so as to obtain the capacity of the accumulated charged battery at each charging time. The charging time may be a time divided in time units, for example, the charging current may be integrated in time units of seconds, and each corresponding charging time is also in seconds; alternatively, the time integration may be performed in units of the charging current, and each corresponding charging time may be performed in units of the charging current. The charging time may be a time divided according to the capacity, the charging depth, and the like of the charge, and for example, the charging time may be a charging time corresponding to 20% dod, 30% dod, 40% dod, and the like, which is not limited in the embodiment of the present application.
S402, the ratio of the capacity of the accumulated charged battery to the maximum capacity of the battery at each charging time is determined, and the remaining capacity of the battery at each charging time is determined.
In this embodiment, the accumulated charge capacity Q is obtained by integrating the current during charging for a time, and the remaining power SOC is obtained by comparing the capacity Q at each charging time with the maximum capacity Qmax of the battery, that is, soc=q/Qmax.
S403, determining the charging depth of the battery at each charging moment according to the remaining capacity of the battery at each charging moment.
In this embodiment, the relationship between the charging depth DOD and the remaining power SOC is dod+soc=1, and the charging depth DOD of the battery at each charging time can be calculated according to the formula dod=1-SOC.
S404, detecting the voltage of the battery at each charging moment.
And S405, establishing a corresponding relation between the depth of discharge and the open circuit voltage according to the depth of charge of the battery at each charging moment and the voltage of the battery at each charging moment.
In this embodiment, the charging depth of the battery at each charging time is obtained, the actual voltage of the battery at each charging time is detected, and since the charging current is very small, the actual voltage V of the battery can be approximately regarded as the open-circuit voltage OCV under the corresponding DOD, so as to obtain the corresponding relationship between the discharging depth DOD and the open-circuit voltage OCV. As shown in fig. 5, the correspondence between the set of depth of discharge DOD and the open circuit voltage OCV obtained after the actual detection is shown.
According to the battery detection method, in the battery charging process, time integration is carried out on charging current to obtain the capacity of the accumulated charged battery at each charging moment, the ratio of the capacity of the accumulated charged battery at each charging moment to the maximum capacity of the battery is determined, the residual capacity of the battery at each charging moment is determined, the charging depth of the battery at each charging moment is determined according to the residual capacity of the battery at each charging moment, the voltage of the battery at each charging moment is detected, and the corresponding relation between the discharging depth and the open-circuit voltage is established according to the charging depth of the battery at each charging moment and the voltage of the battery at each charging moment, so that the corresponding relation between the discharging depth and the open-circuit voltage can be obtained quickly and simply, and the corresponding relation is obtained through an actual detection result, so that the relation between the discharging depth and the open-circuit voltage can be accurately reflected, and the reliability of battery detection is ensured.
The embodiments of fig. 3 to fig. 5 described above mainly describe the specific implementation procedure of the battery detection method when the battery rest information includes a stable voltage corresponding to the depth of discharge, and the following mainly describes the specific implementation procedure of the battery detection method when the battery rest information includes an actual rest time.
In one embodiment, the battery rest information includes an actual rest duration corresponding to the depth of discharge, where the actual rest duration is a duration required for the battery to rest until the voltage stabilizes after the battery is charged to the depth of discharge. As shown in fig. 6, the method may include:
s601, determining a target standing time length corresponding to the discharging depth of the battery according to the corresponding relation between the discharging depth and the standing time length.
In this embodiment, a correspondence between the depth of discharge and the standing time period may be established in advance, and a fresh battery may be taken as an example, and after an optimal charging current of the fresh battery is determined, the time period required for the fresh battery to stand to stabilize the voltage under different DOD is calculated according to the charging current, the capacity, and the like, so as to obtain the correspondence between the depth of discharge and the standing time period.
Optionally, the correspondence may also be obtained by using an actual detection manner, and step S601 may include: acquiring the time length from the start of standing to the time when the voltage of the battery reaches the open circuit voltage corresponding to each circuit depth under different discharging depths; and establishing a corresponding relation between the depth of discharge and the standing time according to different depths of discharge and corresponding time.
In this embodiment, the fresh battery may be charged, and when the fresh battery is charged to 25% DOD, the time required for standing the battery until the voltage is stable is 5min, and when the fresh battery is charged to 35% DOD, the time required for standing the battery until the voltage is stable is 10min, and the standing time periods corresponding to the DOD are sequentially obtained, so that the corresponding relationship between the depth of discharge and the standing time periods is established.
S602, if the actual standing time length corresponding to the depth of discharge is longer than the target standing time length, determining that the current charging current of the battery exceeds the maximum charging current.
In this example, for example, the time required to stand to the corresponding OCV value of 4.0V is 10min for a fresh battery charged to 40% dod with 1C; for the battery after cyclic aging, the battery is charged to 40% DOD, the time required for standing to reach the voltage of 4.0V is 10.5min, and the situation that the battery is provided with lithium metal dendrites and is irreversible is determined to occur, so that the current charging current exceeds the maximum charging current which can be born by 40% DOD.
Further, in one embodiment, obtaining battery rest information corresponding to a depth of discharge of a battery includes: and determining the actual standing time length corresponding to the depth of discharge according to the current charging current of the battery and the current capacity of the battery. In this embodiment, the actual standing duration corresponding to the depth of discharge may be calculated according to the charging current and the capacity of the battery at a certain depth of charge.
Optionally, in another embodiment, obtaining battery standing information corresponding to a depth of discharge of the battery includes: and in the process of standing the battery, when the voltage stability of the battery is detected, determining the standing time length corresponding to the discharge depth according to the standing starting time and the voltage stability time. In this embodiment, the standing time period may be obtained by detecting the voltage value, and determining when the voltage value is stable.
According to the battery detection method provided by the embodiment of the application, the target standing time length corresponding to the discharging depth of the battery is determined according to the corresponding relation between the discharging depth and the standing time length, if the actual standing time length corresponding to the discharging depth is longer than the target standing time length, the current charging current of the battery is determined to exceed the maximum charging current, the actual standing time length corresponding to the battery reaching the preset charging depth and the standard standing time length are compared, the current charging current of the battery is determined to exceed the maximum charging current bearable under the charging depth, and the charging safety of the battery is ensured.
In the foregoing embodiments, the determining whether the current charging current of the battery exceeds the maximum charging current that can be tolerated under the depth of discharge according to the battery rest information corresponding to the depth of discharge of the battery, where the depth of discharge is related to the electric quantity, and optionally, the method for determining the depth of discharge may include: acquiring the current capacity of a battery; determining the ratio of the current capacity of the battery to the maximum capacity of the battery as the residual capacity of the battery; and obtaining the discharge depth of the battery according to the residual electric quantity.
In this embodiment, the current may be integrated over time to obtain the accumulated charge battery capacity Q, the ratio of the accumulated charge battery capacity Q to the maximum battery capacity Qmax is determined as the remaining battery capacity SOC, and the depth of discharge DOD is obtained according to dod=1-SOC. The method is simple and easy to implement, and the discharge depth can be obtained through quick reading and calculation, so that the battery detection efficiency is improved, and the optimal charging current of the battery is quickly determined.
It should be understood that, although the steps in the flowcharts of fig. 2-6 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps of fig. 2-6 may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor does the order in which the sub-steps or stages are performed necessarily occur in sequence, but may be performed alternately or alternately with at least a portion of other steps or sub-steps or stages of other steps.
Fig. 7 is a block diagram showing the structure of a battery detection device according to an embodiment. As shown in fig. 7, the apparatus includes:
an acquisition module 71, configured to acquire battery standing information corresponding to a depth of discharge of the battery; the battery standing information comprises relevant information that the battery is charged to the discharging depth and then stands until the voltage is stable;
and the judging module 72 is configured to judge whether the current charging current of the battery exceeds a maximum charging current according to the battery standing information, where the maximum charging current is a maximum charging current that the battery can withstand under the depth of discharge.
In one embodiment, the battery rest information includes a stable voltage corresponding to the depth of discharge, the stable voltage being a stable voltage after the battery is charged to the depth of discharge; the judgment module 72 includes:
a determining unit, configured to determine a target open circuit voltage corresponding to a depth of discharge of the battery according to a correspondence between the depth of discharge and the open circuit voltage;
and the judging unit is used for judging whether the current charging current of the battery exceeds the maximum charging current according to the target open-circuit voltage and the stable voltage.
In one embodiment, the judging unit is configured to obtain a voltage difference obtained by subtracting the target open-circuit voltage from the stable voltage; and if the voltage difference is smaller than a preset difference threshold, determining that the current charging current of the battery exceeds the maximum charging current.
In one embodiment, the determining unit is configured to determine that the present charging current of the battery exceeds the maximum charging current if the stable voltage is greater than the target open-circuit voltage.
In one embodiment, the obtaining module 71 is further configured to integrate the charging current with time during charging of the battery, so as to obtain a capacity of the accumulated charged battery at each charging time; accumulating the ratio of the capacity of the charged battery to the maximum capacity of the battery at each charging moment, and determining the residual electric quantity of the battery at each charging moment; determining the charging depth of the battery at each charging moment according to the residual electric quantity of the battery at each charging moment; detecting the voltage of the battery at each charging moment; and establishing a corresponding relation between the depth of discharge and the open-circuit voltage according to the depth of charge of the battery at each charging moment and the voltage of the battery at each charging moment.
In one embodiment, the obtaining module 71 is configured to, when detecting that the battery is charged to the depth of discharge, rest the battery and detect a voltage variation amplitude value of the battery; and when the voltage variation amplitude value is smaller than a preset amplitude threshold value, acquiring the current voltage of the battery as the stable voltage.
In one embodiment, the battery rest information includes an actual rest duration corresponding to the depth of discharge, where the actual rest duration is a duration required for the battery to rest until the voltage is stable after the battery is charged to the depth of discharge;
the judging module 72 includes:
a determining unit, configured to determine a target rest duration corresponding to the depth of discharge of the battery according to a correspondence between the depth of discharge and the rest duration;
and the determining unit is used for determining that the current charging current of the battery exceeds the maximum charging current if the actual standing time length corresponding to the discharging depth is longer than the target standing time length.
In one embodiment, the obtaining module 71 is further configured to obtain a duration from when the battery is placed at a stand to when the voltage of the battery reaches an open circuit voltage corresponding to each circuit depth at different discharge depths; and establishing a corresponding relation between the depth of discharge and the standing time according to the different depths of discharge and the corresponding time.
In one embodiment, the obtaining module 71 is configured to determine an actual rest duration corresponding to the depth of discharge according to a current charging current of the battery and a current capacity of the battery.
In one embodiment, the obtaining module 71 is configured to determine, when the voltage of the battery is detected to be stable during the process of standing the battery, a standing duration corresponding to the depth of discharge according to a standing start time and a voltage stability time.
In one embodiment, the obtaining module 71 is further configured to obtain a current capacity of the battery; determining the ratio of the current capacity of the battery to the maximum capacity of the battery as the residual electric quantity of the battery; and obtaining the discharge depth of the battery according to the residual electric quantity.
The implementation principle and the beneficial effects of the above-mentioned device embodiment may refer to the battery detection method embodiment, and are not described herein again.
The above-mentioned division of the respective modules in the battery detection device is only for illustration, and in other embodiments, the battery detection device may be divided into different modules as needed to complete all or part of the functions of the above-mentioned battery detection device.
For specific limitations of the battery detection device, reference may be made to the above limitations of the battery detection method, and no further description is given here. Each of the modules in the above battery detection device may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
Fig. 8 is a schematic diagram of an internal structure of an electronic device in one embodiment. As shown in fig. 8, the electronic device includes a processor and a memory connected by a system bus. Wherein the processor is configured to provide computing and control capabilities to support operation of the entire electronic device. The memory may include a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The computer program is executable by a processor for implementing a battery detection method provided in the following embodiments. The internal memory provides a cached operating environment for operating system computer programs in the non-volatile storage medium. The electronic device may be any terminal device such as a mobile phone, a tablet computer, a PDA (Personal Digital Assistant ), a POS (Point of Sales), a car-mounted computer, and a wearable device.
The implementation of each module in the battery detection device provided in the embodiments of the present application may be in the form of a computer program. The computer program may run on a terminal or a server. Program modules of the computer program may be stored in the memory of the electronic device. Which when executed by a processor, performs the steps of the methods described in the embodiments of the present application.
Embodiments of the present application also provide a computer-readable storage medium. One or more non-transitory computer-readable storage media containing computer-executable instructions that, when executed by one or more processors, cause the processors to perform the steps of a battery detection method.
A computer program product containing instructions that, when run on a computer, cause the computer to perform a battery detection method.
Any reference to memory, storage, database, or other medium used herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM), which acts as external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (14)
1. A battery detection method, characterized by comprising:
obtaining battery standing information corresponding to the discharging depth of the battery; the battery standing information comprises relevant information that the battery is charged to the discharging depth and then stands until the voltage is stable; the battery standing information comprises a stable voltage corresponding to the depth of discharge or an actual standing time length corresponding to the depth of discharge;
judging whether the current charging current of the battery exceeds the maximum charging current according to the battery standing information, wherein the maximum charging current is the maximum charging current which can be born by the battery under the depth of discharge; different detection conditions are set corresponding to different battery standing information.
2. The method according to claim 1, wherein the battery rest information includes a stable voltage corresponding to the depth of discharge, the stable voltage being a stable voltage after the battery is left to rest when the battery is charged to the depth of discharge;
judging whether the current charging current of the battery exceeds the maximum charging current according to the battery standing information, including:
determining a target open circuit voltage corresponding to the depth of discharge of the battery according to the corresponding relation between the depth of discharge and the open circuit voltage;
and judging whether the current charging current of the battery exceeds the maximum charging current according to the target open-circuit voltage and the stable voltage.
3. The method of claim 2, wherein the determining whether the present charge current of the battery exceeds a maximum charge current based on the target open circuit voltage and the regulated voltage comprises:
obtaining a voltage difference value obtained by subtracting the target open-circuit voltage from the stable voltage;
and if the voltage difference is smaller than a preset difference threshold, determining that the current charging current of the battery exceeds the maximum charging current.
4. The method of claim 2, wherein the determining whether the present charge current of the battery exceeds a maximum charge current based on the target open circuit voltage and the regulated voltage comprises:
And if the stable voltage is larger than the target open-circuit voltage, determining that the current charging current of the battery exceeds the maximum charging current.
5. The method according to any one of claims 2-4, further comprising:
in the battery charging process, time integration is carried out on the charging current to obtain the capacity of the accumulated charged battery at each charging moment;
accumulating the ratio of the capacity of the charged battery to the maximum capacity of the battery at each charging moment, and determining the residual electric quantity of the battery at each charging moment;
determining the charging depth of the battery at each charging moment according to the residual electric quantity of the battery at each charging moment;
detecting the voltage of the battery at each charging moment;
and establishing a corresponding relation between the depth of discharge and the open-circuit voltage according to the depth of charge of the battery at each charging moment and the voltage of the battery at each charging moment.
6. The method according to any one of claims 2 to 4, wherein the obtaining battery rest information corresponding to a depth of discharge of the battery includes:
when the battery is detected to be charged to the discharging depth, standing the battery, and detecting the voltage variation amplitude value of the battery;
And when the voltage variation amplitude value is smaller than a preset amplitude threshold value, acquiring the current voltage of the battery as the stable voltage.
7. The method according to claim 1, wherein the battery rest information includes an actual rest period corresponding to the depth of discharge, the actual rest period being a period required for the battery to rest to a voltage stabilization after charging to the depth of discharge;
judging whether the current charging current of the battery exceeds the maximum charging current according to the battery standing information, including:
determining a target standing time length corresponding to the discharging depth of the battery according to the corresponding relation between the discharging depth and the standing time length;
and if the actual standing time length corresponding to the discharging depth is longer than the target standing time length, determining that the current charging current of the battery exceeds the maximum charging current.
8. The method of claim 7, wherein the method further comprises:
acquiring the time length from the start of standing to the time when the voltage of the battery reaches the open circuit voltage corresponding to each circuit depth under different discharging depths;
and establishing a corresponding relation between the depth of discharge and the standing time according to the different depths of discharge and the corresponding time.
9. The method according to claim 7 or 8, wherein the acquiring battery rest information corresponding to a depth of discharge of the battery includes:
and determining the actual standing time length corresponding to the discharging depth according to the current charging current of the battery and the current capacity of the battery.
10. The method according to claim 7 or 8, wherein the acquiring battery rest information corresponding to a depth of discharge of the battery includes:
and in the process of standing the battery, when the voltage stability of the battery is detected, determining the standing time length corresponding to the discharging depth according to the standing starting time and the voltage stability time.
11. The method according to claim 1, wherein the method further comprises:
acquiring the current capacity of the battery;
determining the ratio of the current capacity of the battery to the maximum capacity of the battery as the residual electric quantity of the battery;
and obtaining the discharge depth of the battery according to the residual electric quantity.
12. A battery detection device, characterized by comprising:
the acquisition module is used for acquiring battery standing information corresponding to the discharging depth of the battery; the battery standing information comprises relevant information that the battery is charged to the discharging depth and then stands until the voltage is stable; the battery standing information comprises a stable voltage corresponding to the depth of discharge or an actual standing time length corresponding to the depth of discharge;
The judging module is used for judging whether the current charging current of the battery exceeds the maximum charging current according to the battery standing information, wherein the maximum charging current is the maximum charging current which can be born by the battery under the depth of discharge; different detection conditions are set corresponding to different battery standing information.
13. An electronic device comprising a memory and a processor, the memory having stored therein a computer program which, when executed by the processor, causes the processor to perform the steps of the battery detection method according to any one of claims 1 to 11.
14. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method according to any one of claims 1 to 11.
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| CN112290513A (en) * | 2020-11-16 | 2021-01-29 | Oppo广东移动通信有限公司 | Terminal and battery safety management method and device thereof |
| CN112540315B (en) * | 2020-12-24 | 2021-10-08 | 同济大学 | Battery overdischarge degree detection method |
| CN113219355B (en) * | 2021-03-29 | 2022-04-08 | 安徽江淮汽车集团股份有限公司 | Battery type selection method, device, equipment and storage medium |
| JP2023551843A (en) * | 2021-09-08 | 2023-12-13 | 寧徳時代新能源科技股▲分▼有限公司 | Power battery charging method and battery management system |
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