CN114966433A - Method, device, equipment and medium for positioning self-discharge abnormity of battery pack - Google Patents
Method, device, equipment and medium for positioning self-discharge abnormity of battery pack Download PDFInfo
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- CN114966433A CN114966433A CN202210675223.2A CN202210675223A CN114966433A CN 114966433 A CN114966433 A CN 114966433A CN 202210675223 A CN202210675223 A CN 202210675223A CN 114966433 A CN114966433 A CN 114966433A
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- 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
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- Y02E60/10—Energy storage using batteries
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Abstract
The application provides a method, a device, equipment and a medium for positioning self-discharge abnormity of a battery pack. The method comprises the steps of determining a battery monomer to be tested in the battery pack; detecting whether grouping of the battery monomers to be detected is abnormal or not to obtain a grouping detection result; detecting whether the self-discharge of the battery monomer to be detected is abnormal or not to obtain a battery detection result; and positioning the self-discharge abnormal fault of the battery pack according to the grouped detection result and the battery detection result. Aiming at the battery pack scene, the grouping of the battery monomers and the self-discharge detection of the battery monomers are comprehensively considered, the reason of the self-discharge abnormity of the battery pack in the battery integration scene can be accurately judged, and the position causing the abnormity of the battery pack is accurately positioned, so that the technical personnel can conveniently carry out fault solution.
Description
Technical Field
The application relates to the field of energy storage, in particular to a method, a device, equipment and a medium for positioning self-discharge abnormity of a battery pack.
Background
The rapid application of electrochemical energy storage inevitably brings defects in the aspects of battery production and manufacture, system integration, application and the like, such as the introduction of impurities inside a battery monomer and the introduction of metal particles among the battery monomers in the battery system integration process, and the defects can cause the low voltage of the battery monomers on the external appearance, namely, the self-discharge is rapid, so that the charge and discharge capacity of the whole system is influenced, and the safety risk can be caused seriously.
The current self-discharge abnormity detection means, for example, the chemical reaction and electrochemical corrosion reaction of metal foreign matters are accelerated in the manufacturing process of a battery monomer, and abnormal electric cores are quickly screened out by using the change rate of voltage; or the principle of accelerating the side reaction inside the battery at high temperature is adopted, the screening of the abnormal self-discharge battery is carried out by measuring the open-circuit voltage, the alternating current internal resistance and the self-discharge rate, and then the re-screening, the final screening and the like are carried out at normal temperature.
The above-described means cannot be applied to a battery integration scenario such as abnormality detection of a battery pack.
Disclosure of Invention
The application provides a method, a device, equipment and a medium for positioning self-discharge abnormity of a battery pack, which are used for realizing abnormity positioning in a battery integration scene.
In one aspect, the present application provides a method for locating a self-discharge abnormality of a battery pack, including:
determining a battery monomer to be tested in the battery pack;
detecting whether grouping of the battery monomers to be detected is abnormal or not to obtain a grouping detection result; detecting whether the self-discharge of the battery monomer to be detected is abnormal or not to obtain a battery detection result;
and positioning the self-discharge abnormal fault of the battery pack according to the grouped detection result and the battery detection result.
In one embodiment, the determining the battery cells to be tested in the battery pack includes:
acquiring the voltage of two ends of each battery monomer in the battery pack;
and if the voltage at the two ends of the battery monomer is lower than the average voltage of the monomer in the module or the monomer battery specified by a user exists, taking the battery monomer as the battery monomer to be tested.
In an embodiment, the detecting whether the group of the battery cells to be tested is abnormal to obtain a group detection result includes:
measuring the insulation resistance value between adjacent single battery shells except the single battery to be detected in the battery pack as a standard value;
measuring the insulation resistance between each single battery to be tested and the shell of the adjacent single battery for each single battery to be tested;
and if the insulation resistance of the single battery to be detected and the insulation resistance of the adjacent single battery to be detected are smaller than the standard value, judging that the grouped detection result of the single battery to be detected is abnormal in groups.
In one embodiment, the detecting whether the self-discharge of the battery cell to be tested is abnormal to obtain a battery detection result includes:
calculating and obtaining the self-discharge rate of the test battery pack in a plurality of time periods aiming at the test battery pack formed by the battery monomers except the battery monomer to be tested in the battery pack;
fitting to obtain a standard self-discharge curve based on the self-discharge rate of the test battery pack in the multiple time periods;
calculating and obtaining the self-discharge rate of each battery monomer to be detected;
and obtaining the battery detection result of the battery monomer to be detected by comparing the self-discharge rate of the battery monomer to be detected with the relative position of the standard self-discharge curve.
In one embodiment, the calculating, for a test battery pack composed of battery cells of the battery pack except for the battery cell to be tested, a self-discharge rate of the test battery pack over a plurality of periods includes:
aiming at a test battery pack formed by battery monomers except the battery monomer to be tested in the battery pack, obtaining the static voltage of the test battery pack at a plurality of moments;
according to the static voltages of the test battery pack at the multiple moments, calculating the difference of the adjacent moments to obtain the duration of the corresponding time period; obtaining the difference of the static voltages at the adjacent moments to obtain the change value of the static voltage in the corresponding time period;
and calculating the ratio of the change value of the static voltage in the time interval to the time length of the time interval for each time interval to obtain the self-discharge rate of the test battery pack in the plurality of time intervals.
In one embodiment, before calculating and obtaining the self-discharge rate of the battery cell to be tested for each battery cell to be tested, the method further includes:
for each battery monomer to be tested, disconnecting the assemblies between the battery monomer to be tested and other battery monomers;
discharging the battery monomer to be tested to cut-off voltage, standing, charging to preset electric quantity, and standing.
In one embodiment, the obtaining the battery detection result of the battery cell to be detected by comparing the self-discharge rate of the battery cell to be detected with the relative position of the standard self-discharge curve includes:
and if the position of the self-discharge rate of the battery monomer to be detected in the coordinate system is positioned above the standard self-discharge curve in the coordinate system, judging that the battery detection result of the battery monomer to be detected is abnormal self-discharge.
In another aspect, the present application provides a device for locating a self-discharge abnormality of a battery pack, including:
the determining device is used for determining the single battery to be tested in the battery pack;
the detection device is used for detecting whether the grouping of the battery monomers to be detected is abnormal or not to obtain a grouping detection result; detecting whether the self-discharge of the battery monomer to be detected is abnormal or not to obtain a battery detection result;
and the positioning device is used for positioning the self-discharge abnormal fault of the battery pack according to the grouped detection result and the battery detection result.
In an embodiment, the determining device is specifically configured to obtain a voltage across each battery cell in the battery pack;
the determining device is further configured to use the battery cell as the battery cell to be tested if the voltages at the two ends of the battery cell are lower than the average voltage of the battery cells in the module or the battery cell specified by a user exists.
In one embodiment, the detection device is specifically configured to measure, as a standard value, an insulation resistance value between adjacent battery cell housings in the battery pack except for the battery cell to be measured;
the detection device is specifically used for measuring the insulation resistance between each single battery to be detected and the adjacent single battery shell;
the detection device is specifically further configured to determine that the grouped detection result of the single battery to be detected is abnormal in a group if the insulation resistance of the single battery to be detected and the insulation resistance of the adjacent single battery are smaller than the standard value.
In an embodiment, the detection device is further specifically configured to calculate, for a test battery pack formed by battery cells in the battery pack except for the battery cell to be tested, a self-discharge rate of the test battery pack in multiple time periods;
the detection device is specifically used for fitting to obtain a standard self-discharge curve based on the self-discharge rate of the test battery pack in the multiple time periods;
the detection device is specifically used for calculating and obtaining the self-discharge rate of each single battery to be detected;
the detection device is specifically used for obtaining a battery detection result of the battery to be detected by comparing the self-discharge rate of the battery to be detected with the relative position of the standard self-discharge curve.
In an embodiment, the detection device is specifically further configured to obtain, for a test battery pack formed by battery cells in the battery pack except for the battery cell to be tested, static voltages of the test battery pack at multiple times;
the detection device is specifically further configured to obtain a duration of a corresponding time period by subtracting adjacent times according to the static voltages of the test battery pack at the multiple times; obtaining the difference of the static voltages at the adjacent moments to obtain the change value of the static voltage in the corresponding time period;
the detection device is specifically configured to calculate, for each period, a ratio of a change value of the static voltage in the period to a duration of the period, so as to obtain a self-discharge rate of the test battery pack in the plurality of periods.
In an embodiment, the detection device is specifically further configured to disconnect, for each battery cell to be tested, a component between the battery cell to be tested and another battery cell;
the detection device is specifically used for discharging the battery monomer to be detected to cut-off voltage, standing, charging to preset electric quantity and standing.
In an embodiment, the detection device is further specifically configured to determine that the battery detection result of the battery cell to be detected is abnormal self-discharge if the position of the self-discharge rate of the battery cell to be detected in the coordinate system is located above the standard self-discharge curve in the coordinate system.
In yet another aspect, the present application provides an electronic device comprising: a processor, and a memory communicatively coupled to the processor;
the memory stores computer-executable instructions;
the processor executes the computer-executable instructions stored by the memory to implement the method as previously described.
In yet another aspect, the present application provides a computer-readable storage medium having stored therein computer-executable instructions for implementing the method as described above when executed by a processor.
In the method, the device, the equipment and the medium for positioning the self-discharge abnormity of the battery pack, the single battery with the voltage smaller than the rated voltage is determined as the single battery to be tested through the voltage of each single battery in the battery pack; the method comprises the steps of detecting whether the grouped state between the single battery bodies connected with the two sides of the single battery body to be detected is abnormal or not, detecting whether the self-discharge of the single battery body to be detected is abnormal or not, and locating the self-discharge abnormal fault of the battery pack. Aiming at the battery pack scene, the grouping of the battery monomers and the self-discharge detection of the battery monomers are comprehensively considered, the reason of the self-discharge abnormity of the battery pack in the battery integration scene can be accurately judged, and the position causing the abnormity of the battery pack is accurately positioned, so that the technical personnel can conveniently carry out fault solution.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
FIG. 1 is an exemplary battery topology;
fig. 2 is a schematic flowchart illustrating a method for locating a self-discharge abnormality of a battery pack according to an embodiment of the present disclosure;
FIG. 3 is a standard self-discharge curve of a battery cell;
FIG. 4 is a comparison graph of the self-discharge rate of the battery cell to be tested and the self-discharge curve of the standard battery cell;
fig. 5 is a schematic structural diagram of a positioning device for abnormal self-discharge of a battery pack according to a second embodiment of the present application;
fig. 6 is a schematic structural diagram of an electronic device provided in an embodiment of the present application;
fig. 7 is an apparatus block diagram illustrating a central control unit according to an exemplary embodiment.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. The drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the concepts of the application by those skilled in the art with reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
It should be noted that the brief descriptions of the terms in the present application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of the present application. These terms should be understood in their ordinary and customary meaning unless otherwise indicated.
At present, the integration mode of the battery is various, for example, fig. 1 is a topological diagram of an exemplary battery pack, and the battery pack in fig. 1 is formed by connecting a plurality of battery cells in series and parallel. The application discovers that the battery pack self-discharge abnormity can be caused no matter which battery monomer is abnormal in the battery pack, and the battery pack self-discharge abnormity can also be caused due to the abnormity of the grouped battery monomers. Therefore, it is important to accurately determine whether the reason for the self-discharge abnormality of the battery pack is that the battery cells or the battery cells are grouped, and it is necessary to accurately locate the position where the battery pack is abnormal, so that technicians can conveniently solve the self-discharge abnormality of the battery pack.
The technical means of the present application and the technical means of the present application will be described in detail with specific examples below. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. In the description of the present application, unless otherwise explicitly specified and defined, each term should be understood broadly in the art. Embodiments of the present application will be described below with reference to the accompanying drawings.
Example one
Fig. 2 is a schematic flowchart of a method for locating a self-discharge abnormality of a battery pack according to an embodiment of the present application, as shown in fig. 2, the method includes:
102, detecting whether grouping of the battery monomers to be detected is abnormal or not, and obtaining a grouping detection result; detecting whether the self-discharge of the battery monomer to be detected is abnormal or not to obtain a battery detection result;
and 103, positioning the self-discharge abnormal fault of the battery pack according to the grouped detection result and the battery detection result.
Combining a scene example: the battery pack is generally formed by integrating a plurality of battery cells, and the self-discharge abnormality of the battery pack is caused by the abnormality of the battery cells themselves or the mutual grouping abnormality among the battery cells. For the situation that the self-discharge of the battery pack is abnormal, a suspected abnormal battery cell or abnormal range can be determined, and the range of investigation is narrowed. Marking the suspected abnormal single battery or the abnormal range as a single battery to be detected or an abnormal range to be detected, subsequently detecting whether the grouping between the single battery to be detected and the single batteries on the two sides is abnormal or not, detecting whether the self-discharge of the single battery to be detected is abnormal or not, and judging the reason and the position of the self-discharge abnormality of the battery pack through the two detection means.
In one example, the determining the battery cells to be tested in the battery pack includes:
acquiring the voltage of two ends of each battery monomer in the battery pack;
and if the voltage at the two ends of the battery monomer is lower than the average voltage of the monomer in the module or the monomer battery specified by a user exists, taking the battery monomer as the battery monomer to be tested.
Optionally, each single battery forming the battery pack has a static voltage, and after the self-discharge abnormality of the battery pack is found, the actual working voltage of each single battery forming the battery pack can be measured by using a multimeter. If the measured actual working voltage of the battery cell is obviously lower than the average voltage of the battery cells in the module or the battery cell specified by the user exists, the battery cell can be marked as the battery cell suspected of being abnormal, so that the subsequent continuous targeted measurement is facilitated. The abnormal battery cells are sometimes not only one, so if the working voltages of the plurality of battery cells are measured to be abnormal or suspected, the plurality of battery cells are marked as abnormal battery cells or an abnormal range.
In one example, the detecting whether the grouping of the battery cells to be tested is abnormal to obtain a grouping detection result includes:
measuring the insulation resistance value between adjacent single battery shells except the single battery to be detected in the battery pack as a standard value;
measuring the insulation resistance between each single battery to be tested and the shell of the adjacent single battery for each single battery to be tested;
and if the insulation resistance of the battery monomer to be detected and the insulation resistance of the adjacent battery monomer are smaller than the standard value, judging that the grouped detection result of the battery monomer to be detected is abnormal in groups.
Specifically, if the measured static voltage of the battery cell is less than the average voltage of the battery cells in the module or the battery cell specified by the user exists, the battery cell is marked as a suspected abnormal battery cell, wherein the battery cell specified by the user refers to the battery cell which is judged by the user to be abnormal according to actual experience, and the rest battery cells are normal battery cells. The voltage abnormity of the marked suspected abnormal single cell can be caused by the cell problem of the single cell and the grouping problem between the single cell and the single cells at two sides, so that the working voltage of the single cell is smaller than the average voltage of the single cells in the module, and the self-discharge abnormity of the whole battery pack is never caused.
In order to more accurately determine the problem of the abnormal self-discharge of the battery pack, not only the abnormal suspected cells marked with the marks and the cells on both sides are detected to determine whether the grouping is abnormal, but also the abnormal suspected cells marked with the marks are detected to determine whether the self-discharge of the abnormal suspected cells themselves is abnormal. Specifically, a multimeter can be used to measure the grouped insulation resistance values between normal battery cell casings, and the measured resistance values are used as the standard values of the grouped insulation resistance values between the battery cell casings. And then, measuring the insulation resistance value of the group between the marked suspected abnormal single cell and the battery cell shells at the two sides of the marked suspected abnormal single cell, if the insulation resistance value between the marked suspected abnormal single cell and the battery cell shells at the two sides of the marked suspected abnormal single cell is smaller than the standard value of the measured insulation resistance, judging that the group between the marked suspected abnormal single cell and the battery cell shells at the two sides of the marked abnormal single cell is abnormal, and if not, judging that the group is not abnormal.
In one example, the detecting whether the self-discharge of the battery cell to be tested is abnormal or not to obtain a battery detection result includes:
calculating and obtaining the self-discharge rate of the test battery pack in a plurality of time periods aiming at the test battery pack formed by the battery monomers except the battery monomer to be tested in the battery pack;
fitting to obtain a standard self-discharge curve based on the self-discharge rate of the test battery pack in the multiple time periods;
calculating and obtaining the self-discharge rate of each battery monomer to be detected;
and obtaining the battery detection result of the battery monomer to be detected by comparing the self-discharge rate of the battery monomer to be detected with the relative position of the standard self-discharge curve.
After measuring the insulation resistance value of the group between the marked abnormal suspected monomer and the battery cells at two sides of the abnormal suspected monomer, if the measured resistance value is not less than the standard value of the insulation resistance, the group between the marked abnormal suspected monomer and the battery cells at two sides of the abnormal suspected monomer is considered to have no problem, and whether the self-discharge of the marked abnormal suspected monomer is abnormal needs to be further judged. If the measured resistance value is smaller than the standard value of the insulation resistance, it can be judged that a problem occurs in the group between the marked suspected abnormal cell and the battery cells on both sides thereof, but it cannot be excluded that the marked suspected abnormal cell has no problem, and therefore it is also necessary to further detect whether the self-discharge of the marked suspected abnormal cell itself is normal.
Optionally, the marked suspected abnormal cell is disconnected from the assemblies between the two battery cells on the two sides of the suspected abnormal cell, so that a normally working battery pack is formed between the other normal battery cells, the self-discharge rate of the normally working battery pack at multiple moments is measured and calculated, and is fitted to be a self-discharge curve, and the self-discharge rate curve is used as a standard self-discharge curve of the battery cells. And then measuring the self-discharge rate of each marked suspected abnormal battery cell, and comparing the relative positions of the standard self-discharge curve of the battery cell and the self-discharge rate of the marked suspected abnormal battery cell to obtain the detection result of the self-discharge rate of the marked suspected abnormal battery cell.
The standard self-discharge curve of the battery monomer is a self-discharge curve which is formed by fitting the self-discharge rates of the normally working battery pack at different moments through calculation, and the fitting of the self-discharge curve can also be realized by selectively calculating the self-discharge rate of the normally working battery monomer. In actual measurement, even if the battery cells are working normally, there are differences in parameters between the battery cells, for example, the difference in the capacities of the battery cells may cause errors in the self-discharge curves fitted to the different battery cells. Therefore, fitting a standard self-discharge curve can select to calculate the self-discharge rate of the battery pack which normally works to offset errors caused by parameter differences among battery cells.
In one example, the calculating, for a test battery pack composed of battery cells of the battery pack except for the battery cell to be tested, a self-discharge rate of the test battery pack over a plurality of periods includes:
aiming at a test battery pack formed by battery monomers except the battery monomer to be tested in the battery pack, obtaining the static voltage of the test battery pack at a plurality of moments;
according to the static voltages of the test battery pack at the multiple moments, calculating the difference of the adjacent moments to obtain the duration of the corresponding time period; obtaining the difference of the static voltages at the adjacent moments to obtain the change value of the static voltage in the corresponding time period;
and calculating the ratio of the change value of the static voltage in the time interval to the time length of the time interval for each time interval so as to obtain the self-discharge rate of the test battery pack in the plurality of time intervals.
Specifically, the self-discharge rate of the normally working battery pack in a plurality of time periods is obtained, the self-discharge rate is fitted to a self-discharge curve, the normally working battery pack needs to be placed for a period of time at a certain temperature, and the static voltages at different moments are recorded. The temperature of the rest can be selected to be 20 ℃ or above 20 ℃, and the rest time can be selected to be 3-14 days. And recording the static voltage of the normally working battery pack at different moments in the resting period, obtaining the self-discharge rate of the battery pack at different moments, and fitting into a self-discharge rate curve.
For example, in obtaining the self-discharge rate of the battery pack at different times, the different measurement times can be recorded as: t1, T2, T3 … Tx-1, Tx, the static voltage of the battery pack corresponding to the time is: v1, V2, V3 … Vx-1 and Vx. The calculation formula of the self-discharge rate K corresponding to the battery pack at time Tx is: k is (Vx-1)/(Tx-1). The self-discharge rate corresponding to each moment can be obtained by using the formula for calculating the self-discharge rate K, and the self-discharge curve of the battery pack is obtained by fitting and is used as the standard self-discharge curve of the single battery, as shown in fig. 3, fig. 3 is the standard self-discharge curve of the single battery.
In one example, before calculating and obtaining the self-discharge rate of the battery cell to be tested for each battery cell to be tested, the method further includes:
for each battery monomer to be tested, disconnecting the assemblies between the battery monomer to be tested and other battery monomers;
discharging the battery monomer to be tested to cut-off voltage, standing, charging to preset electric quantity, and standing.
After obtaining the self-discharge curve of the battery cell standard, the self-discharge rate of each marked suspected abnormal battery cell needs to be measured continuously. Specifically, for each battery cell to be measured, the battery cell and the battery cells on two sides need to be disconnected in groups, the marked battery cells are respectively discharged to a cut-off voltage specified by a manufacturer at a small multiplying power (optionally 0-1C), then are kept stand for a period of time, the standing time can be 5min-2h, and after the battery cells are kept stand for a period of time, the battery cells are charged at a small multiplying power of 0-0.5C. If the single battery is a lithium iron phosphate battery, the electric quantity of the battery can be charged to 0-10% SOC, if the single battery is a ternary battery, the electric quantity of the battery is charged to 0-100% SOC, and the battery is placed after charging is finished.
In one example, the obtaining the battery detection result of the battery cell to be detected by comparing the self-discharge rate of the battery cell to be detected with the relative position of the standard self-discharge curve includes:
and if the position of the self-discharge rate of the battery monomer to be detected in the coordinate system is positioned above the standard self-discharge curve in the coordinate system, judging that the battery detection result of the battery monomer to be detected is abnormal self-discharge.
Specifically, in the process of placing the battery cell to be measured, the corresponding static voltage is measured at any two moments, the self-discharge rate of the battery cell is calculated, and the measured self-discharge rate of the battery cell is compared with the standard self-discharge curve of the battery cell. As shown in fig. 4, fig. 4 is a graph comparing the self-discharge rate of the battery cell to be tested with the self-discharge curve of the standard battery cell. As shown in the figure, the positional relationship between the measured self-discharge rate of the battery cell and the self-discharge curve of the standard battery cell is approximately classified into three types, respectively: above the curve (as in the a point location); below the curve (e.g., C-point location); just on the curve (e.g., B-point location). If the measured self-discharge rate of the single battery is at the position of the point B or the point C, the self-discharge of the single battery can be judged to be abnormal, but if the measured self-discharge rate of the single battery is at the position of the point A, the self-discharge of the single battery is judged to be abnormal.
According to the method, suspected abnormal single batteries or ranges are determined and marked according to the voltage of two ends of the single batteries, and then the self-discharge rate of the marked single batteries is further measured by measuring the insulation resistance between the marked single batteries and the shells of the single batteries on two sides, so that the problem that the self-discharge abnormality of the battery pack is caused by grouping of the single batteries or the single batteries is solved. The method can accurately judge the reason of the self-discharge abnormity of the battery pack and accurately position the abnormal position, thereby facilitating technical personnel to solve the self-discharge abnormity of the battery pack.
Example two
Fig. 5 is a schematic structural diagram of a positioning device for battery pack self-discharge abnormality according to a second embodiment of the present application, as shown in fig. 5, the device includes:
a determining device 21, configured to determine a single battery to be tested in the battery pack;
the detection device 22 is used for detecting whether the grouping of the battery monomers to be detected is abnormal or not to obtain a grouping detection result; detecting whether the self-discharge of the battery monomer to be detected is abnormal or not to obtain a battery detection result;
and a positioning device 23, configured to perform self-discharge abnormal fault positioning on the battery pack according to the group detection result and the battery detection result.
Combining a scene example: the battery pack is generally formed by integrating a plurality of battery cells, and the self-discharge abnormality of the battery pack is caused by the abnormality of the battery cells themselves or the mutual grouping abnormality among the battery cells. In the case where the battery pack is abnormal in self-discharge, the determination device 21 may determine a suspected abnormal cell or abnormal range, and narrow the range of the examination. Marking the suspected abnormal single battery or abnormal range as a single battery to be detected or an abnormal range to be detected, detecting whether the grouping between the single battery to be detected and the single batteries on the two sides is abnormal or not by the subsequent detection device 22, detecting whether the self-discharge of the single battery to be detected is abnormal or not, and judging the reason and the position of the self-discharge abnormality of the battery pack by the positioning device 23 through the two detection means.
The determining device 21 is specifically configured to obtain voltages at two ends of each battery cell in the battery pack;
the determining device 21 is further configured to use the battery cell as the battery cell to be tested if the voltage at two ends of the battery cell is lower than the average voltage of the battery cells in the module or a battery cell specified by a user exists.
Optionally, each single battery forming the battery pack has its own static voltage, and when the self-discharge abnormality of the battery pack is found, the actual working voltage of each single battery forming the battery pack can be measured by using a multimeter. If the measured actual operating voltage of the battery cell is significantly lower than the average voltage of the cells in the module or if a cell specified by the user exists, the determining device 21 may mark the battery cell as a suspected abnormal battery cell, which facilitates subsequent continuous targeted measurement. The abnormal battery cells are sometimes not only one, and if the working voltages of the plurality of battery cells are measured to be abnormal or suspected, the plurality of battery cells are marked as abnormal battery cells or an abnormal range.
The detection device 22 is specifically used for measuring the insulation resistance value between the shells of the adjacent single batteries in the battery pack except for the single battery to be detected as a standard value;
the detection device 22 is further configured to measure, for each single battery cell to be tested, an insulation resistance between the single battery cell to be tested and an adjacent single battery cell casing;
the detection device 22 is specifically configured to determine that the grouped detection result of the battery cell to be detected is abnormal in a group if the insulation resistance of the battery cell to be detected and the insulation resistance of the adjacent battery cell are smaller than the standard value.
Specifically, if the static voltage of the battery cell measured by the detection device 22 is lower than the average voltage of the battery cells in the module or the battery cell specified by the user exists, the battery cell is marked as an abnormal battery cell in doubt, wherein the battery cell specified by the user refers to an elevator which is judged by the user to be eaten according to actual experience and may have abnormality, and the rest battery cells are normal battery cells. The voltage abnormality of the marked suspected abnormal single cell may be caused by the cell problem of the single cell itself, or may be caused by the problem of grouping between the single cell and the single cells on two sides, so that the working voltage of the single cell is smaller than the average voltage of the single cells in the module, and the self-discharge abnormality of the whole battery pack is never caused.
In order to more accurately determine the problem of the battery pack self-discharge abnormality, the detection device 22 not only detects whether the group between the marked suspected abnormal cell and the battery cells on both sides is abnormal, but also detects whether the self-discharge of the marked suspected abnormal cell itself is abnormal. Specifically, a multimeter can be used to measure the grouped insulation resistance values between the normal battery cell casings, and the measured resistance values are used as the standard values of the grouped insulation resistance values between the battery cell casings. And then, measuring the insulation resistance value of the group between the marked suspected abnormal single cell and the battery cell shells at two sides of the marked suspected abnormal single cell, if the insulation resistance value of the marked suspected abnormal single cell and the battery cell shells at two sides of the marked suspected abnormal single cell is smaller than the standard value of the measured insulation resistance, judging that the group between the marked suspected abnormal single cell and the battery cell shells at two sides of the marked abnormal single cell is abnormal, and if not, judging that the group is abnormal.
The detection device 22 is specifically configured to calculate and obtain a self-discharge rate of the test battery pack in multiple time periods for the test battery pack formed by battery cells in the battery pack except the battery cell to be tested;
the detection device 22 is specifically further configured to fit a standard self-discharge curve based on the self-discharge rates of the test battery pack in the multiple time periods;
the detection device 22 is specifically configured to calculate and obtain a self-discharge rate of each battery cell to be detected;
the detection device 22 is specifically configured to obtain a battery detection result of the battery cell to be detected by comparing the self-discharge rate of the battery cell to be detected with the relative position of the standard self-discharge curve.
After measuring the insulation resistance value of the group between the marked suspected abnormal cell and the battery cells on both sides thereof, if the measured resistance value is not less than the standard value of the insulation resistance, the detection device 22 considers that there is no problem in the group between the marked suspected abnormal cell and the battery cells on both sides thereof, and needs to further determine whether the self-discharge of the marked suspected abnormal cell is abnormal. If the measured resistance value is smaller than the standard value of the insulation resistance, it can be judged that a problem occurs in the group between the marked suspected abnormal cell and the battery cells on both sides thereof, but it cannot be excluded that the marked suspected abnormal cell has no problem, and therefore it is also necessary to further detect whether the self-discharge of the marked suspected abnormal cell itself is normal.
Optionally, the marked suspected abnormal cell is disconnected from the assemblies between the two battery cells on the two sides of the suspected abnormal cell, so that a normally working battery pack is formed between the other normal battery cells, the detection device 22 measures and calculates the self-discharge rate of the normally working battery pack at multiple moments, and fits the self-discharge rate to a self-discharge curve, and the self-discharge rate curve is used as a standard self-discharge curve of the battery cells. The detection device 22 measures the self-discharge rate of each marked suspected abnormal battery cell again, and compares the relative position of the standard self-discharge curve of the battery cell and the self-discharge rate of the marked suspected abnormal battery cell to obtain the detection result of the self-discharge rate of the marked suspected abnormal battery cell.
The standard self-discharge curve of the battery monomer is a self-discharge curve which is formed by fitting the self-discharge rates of the normally working battery pack at different moments through calculation, and the fitting of the self-discharge curve can also be realized by selectively calculating the self-discharge rate of the normally working battery monomer. In actual measurement, even if the battery cells are working normally, there are differences in parameters between the battery cells, for example, the difference in the capacities of the battery cells may cause errors in the self-discharge curves fitted to the different battery cells. Therefore, the self-discharge rate of the battery pack which normally works can be selectively calculated by fitting a standard self-discharge curve to counteract errors caused by parameter differences among the battery cells
The detection device 22 is specifically configured to obtain, for a test battery pack formed by battery cells of the battery pack except the battery cell to be tested, static voltages of the test battery pack at multiple times;
the detection device 22 is specifically further configured to obtain a duration of a corresponding time period by subtracting adjacent times according to the static voltages of the test battery pack at the multiple times; obtaining the difference of the static voltages at the adjacent moments to obtain the change value of the static voltage in the corresponding time period;
the detecting device 22 is specifically configured to calculate, for each time interval, a ratio of a change value of the static voltage in the time interval to a time length of the time interval, so as to obtain a self-discharge rate of the test battery pack in the multiple time intervals.
Specifically, the detection device 22 obtains the self-discharge rate of the normally operating battery pack in a plurality of time periods, fits the self-discharge rate to a self-discharge curve, and holds the normally operating battery pack at a certain temperature for a period of time, and records the static voltages at different times. The temperature of the rest can be selected to be 20 ℃ or above 20 ℃, and the rest time can be selected to be 3-14 days. And recording the static voltage of the normally working battery pack at different moments in the resting period, obtaining the self-discharge rate of the battery pack at different moments, and fitting into a self-discharge rate curve.
For example, in obtaining the self-discharge rate of the battery pack at different times, the different measurement times of the detection device 22 can be recorded as: t1, T2, T3 … Tx-1, Tx, the quiescent voltage of the battery pack corresponding to the time is: v1, V2, V3 … Vx-1 and Vx. The calculation formula of the self-discharge rate K corresponding to the battery pack at the time Tx is as follows: k is (Vx-Vx-1)/(Tx-Tx-1). The self-discharge rate corresponding to each moment can be obtained by using the formula for calculating the self-discharge rate K, and the self-discharge curve of the battery pack is obtained by fitting and is used as the standard self-discharge curve of the single battery, as shown in fig. 3, fig. 3 is the standard self-discharge curve of the single battery.
The detection device 22 is specifically configured to disconnect, for each battery cell to be tested, a component between the battery cell to be tested and another battery cell;
the detection device 22 is specifically configured to discharge the battery cell to be detected to a cut-off voltage, charge the battery cell to a predetermined electric quantity after standing, and lay the battery cell.
After obtaining the standard self-discharge curve of the battery cells, the detection device 22 needs to continuously measure the self-discharge rate of each marked suspected abnormal battery cell. Specifically, for each battery cell to be measured, grouping disconnection between the battery cell and the battery cells on two sides is required, the marked battery cells are respectively discharged to a cut-off voltage specified by a manufacturer at a small multiplying factor (optionally 0-1C), then standing is carried out for a period of time, the standing time can be 5min-2h, and after the standing is carried out for a period of time, charging is carried out at a small multiplying factor of 0-0.5C. If the single battery is a lithium iron phosphate battery, the electric quantity of the battery can be charged to 0-10% SOC, if the single battery is a ternary battery, the electric quantity of the battery is charged to 0-100% SOC, and the battery is placed after charging is finished.
The detecting device 22 is further configured to determine that the battery detection result of the battery cell to be detected is abnormal self-discharge if the position of the self-discharge rate of the battery cell to be detected in the coordinate system is located above the standard self-discharge curve in the coordinate system.
Specifically, in the process of placing the battery cell to be measured, the corresponding static voltage is measured at any two moments, the self-discharge rate of the battery cell is calculated, and the positioning device 23 compares the measured self-discharge rate of the battery cell with the self-discharge curve of the standard battery cell. If the measured self-discharge rate of the battery monomer is just at the upper point of the curve or at the lower position of the curve, it can be judged that the measured self-discharge of the battery monomer is not abnormal, but if the measured self-discharge rate of the battery monomer is at the upper position of the curve, it indicates that the measured self-discharge of the battery monomer is abnormal.
According to the method, suspected abnormal single batteries or ranges are determined and marked according to the voltage of two ends of the single batteries, and then the self-discharge rate of the marked single batteries is further measured by measuring the insulation resistance between the marked single batteries and the shells of the single batteries on two sides, so that the problem that the self-discharge abnormality of the battery pack is caused by grouping of the single batteries or the single batteries is solved. The method can accurately judge the reason of the self-discharge abnormity of the battery pack and accurately position the abnormal position, thereby facilitating technical personnel to solve the self-discharge abnormity of the battery pack.
EXAMPLE III
Fig. 6 is a schematic structural diagram of an electronic device provided in an embodiment of the present application, and as shown in fig. 6, the electronic device includes:
a processor (processor)291, the electronic device further including a memory (memory) 292; a Communication Interface 293 and bus 294 may also be included. The processor 291, the memory 292, and the communication interface 293 may communicate with each other via the bus 294. Communication interface 293 may be used for the transmission of information. Processor 291 may call logic instructions in memory 294 to perform the methods of the embodiments described above.
Further, the logic instructions in the memory 292 may be implemented in software functional units and stored in a computer readable storage medium when sold or used as a stand-alone product.
The memory 292 is used as a computer-readable storage medium for storing software programs, computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present application. The processor 291 executes the functional application and data processing by executing the software program, instructions and modules stored in the memory 292, so as to implement the method in the above method embodiments.
The memory 292 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. Further, the memory 292 may include a high speed random access memory and may also include a non-volatile memory.
The present application provides a non-transitory computer-readable storage medium, in which computer-executable instructions are stored, and when executed by a processor, the computer-executable instructions are used to implement the method according to the foregoing embodiments.
Example four
Fig. 7 is a block diagram illustrating an apparatus of a central control unit, which may be a computer, a terminal, a messaging device, a tablet device, an operator console, etc., according to an exemplary embodiment. The apparatus may be used to perform the grid-tie control method described in the foregoing embodiments.
The apparatus 800 may include one or more of the following components: a processing component 802, a memory 804, a power component 806, a multimedia component 808, an audio component 810, an input/output (I/O) interface 812, a sensor component 814, and a communication component 816.
The processing component 802 generally controls overall operation of the device 800, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing components 802 may include one or more processors 820 to execute instructions to perform all or a portion of the steps of the methods described above. Further, the processing component 802 can include one or more modules that facilitate interaction between the processing component 802 and other components. For example, the processing component 802 can include a multimedia module to facilitate interaction between the multimedia component 808 and the processing component 802.
The memory 804 is configured to store various types of data to support operations at the apparatus 800. Examples of such data include instructions for any application or method operating on device 800, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 804 may be implemented by any type or combination of volatile or non-volatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.
Optionally, the multimedia component 808 includes a screen providing an output interface between the device 800 and the user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 808 includes a front facing camera and/or a rear facing camera. The front camera and/or the rear camera may receive external multimedia data when the device 800 is in an operating mode, such as a shooting mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.
Optionally, the audio component 810 is configured to output and/or input audio signals. For example, the audio component 810 includes a Microphone (MIC) configured to receive external audio signals when the apparatus 800 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may further be stored in the memory 804 or transmitted via the communication component 816. In some embodiments, audio component 810 also includes a speaker for outputting audio signals.
The I/O interface 812 provides an interface between the processing component 802 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.
The sensor assembly 814 includes one or more sensors for providing various aspects of state assessment for the device 800. For example, the sensor assembly 814 may detect the open/closed status of the device 800, the relative positioning of components, such as a display and keypad of the device 800, the sensor assembly 814 may also detect a change in the position of the device 800 or a component of the device 800, the presence or absence of user contact with the device 800, the orientation or acceleration/deceleration of the device 800, and a change in the temperature of the device 800. Sensor assembly 814 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 814 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
The communication component 816 is configured to facilitate communications between the apparatus 800 and other devices in a wired or wireless manner. The apparatus 800 may access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 816 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 816 further includes a Near Field Communication (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, Ultra Wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.
In an exemplary embodiment, the apparatus 800 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors or other electronic components for performing the above-described methods.
In an exemplary embodiment, a non-transitory computer-readable storage medium comprising instructions, such as the memory 804 comprising instructions, executable by the processor 820 of the device 800 to perform the above-described method is also provided. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (16)
1. A method for locating battery pack self-discharge abnormality, comprising:
determining a battery monomer to be tested in the battery pack;
detecting whether grouping of the battery monomers to be detected is abnormal or not to obtain a grouping detection result; detecting whether the self-discharge of the battery monomer to be detected is abnormal or not to obtain a battery detection result;
and positioning the self-discharge abnormal fault of the battery pack according to the grouped detection result and the battery detection result.
2. The method of claim 1, wherein the determining the cells to be tested in the battery pack comprises:
acquiring the voltage of two ends of each battery monomer in the battery pack;
and if the voltage at the two ends of the battery monomer is lower than the average voltage of the monomer in the module or the monomer battery specified by a user exists, taking the battery monomer as the battery monomer to be tested.
3. The method according to claim 1, wherein the detecting whether the group of the battery cells to be tested is abnormal to obtain a group of detection results comprises:
measuring the insulation resistance value between the adjacent single battery shells except the single battery to be detected in the battery pack as a standard value;
measuring the insulation resistance between each single battery to be tested and the shell of the adjacent single battery for each single battery to be tested;
and if the insulation resistance of the single battery to be detected and the insulation resistance of the adjacent single battery to be detected are smaller than the standard value, judging that the grouped detection result of the single battery to be detected is abnormal in groups.
4. The method according to any one of claims 1 to 3, wherein the detecting whether the self-discharge of the battery cell to be tested is abnormal or not and obtaining the battery detection result comprises:
calculating and obtaining the self-discharge rate of the test battery pack in a plurality of time periods aiming at the test battery pack formed by the battery monomers except the battery monomer to be tested in the battery pack;
fitting to obtain a standard self-discharge curve based on the self-discharge rate of the test battery pack in the multiple time periods;
calculating and obtaining the self-discharge rate of each battery monomer to be detected;
and obtaining the battery detection result of the battery monomer to be detected by comparing the self-discharge rate of the battery monomer to be detected with the relative position of the standard self-discharge curve.
5. The method according to claim 4, wherein the calculating and obtaining the self-discharge rate of the test battery pack in a plurality of periods for the test battery pack composed of battery cells except the battery cell to be tested comprises:
aiming at a test battery pack formed by battery monomers except the battery monomer to be tested in the battery pack, obtaining the static voltage of the test battery pack at a plurality of moments;
according to the static voltages of the test battery pack at the multiple moments, calculating the difference of the adjacent moments to obtain the duration of the corresponding time period; obtaining the difference of the static voltages at the adjacent moments to obtain the change value of the static voltage in the corresponding time period;
and calculating the ratio of the change value of the static voltage in the time interval to the time length of the time interval for each time interval to obtain the self-discharge rate of the test battery pack in the plurality of time intervals.
6. The method according to claim 4, wherein before calculating and obtaining the self-discharge rate of the battery cell to be tested for each battery cell to be tested, the method further comprises:
for each battery monomer to be tested, disconnecting the assemblies between the battery monomer to be tested and other battery monomers;
discharging the battery monomer to be tested to cut-off voltage, standing, charging to preset electric quantity, and standing.
7. The method as claimed in claim 4, wherein the obtaining of the battery test result of the battery cell to be tested by comparing the self-discharge rate of the battery cell to the relative position of the standard self-discharge curve comprises:
and if the position of the self-discharge rate of the single battery to be detected in the coordinate system is positioned above the standard self-discharge curve in the coordinate system, judging that the battery detection result of the single battery to be detected is abnormal self-discharge.
8. A device for locating a self-discharge abnormality of a battery pack, comprising:
the determining device is used for determining the single battery to be tested in the battery pack;
the detection device is used for detecting whether the grouping of the battery monomers to be detected is abnormal or not to obtain a grouping detection result; detecting whether the self-discharge of the battery monomer to be detected is abnormal or not to obtain a battery detection result;
and the positioning device is used for positioning the self-discharge abnormal fault of the battery pack according to the grouped detection result and the battery detection result.
9. The apparatus of claim 8,
the determining device is specifically used for acquiring the voltage at two ends of each single battery in the battery pack;
the determining device is further configured to use the battery cell as the battery cell to be tested if the voltages at the two ends of the battery cell are lower than the average voltage of the battery cells in the module or the battery cell specified by a user exists.
10. The apparatus of claim 8,
the detection device is specifically used for measuring the insulation resistance value between adjacent single battery shells in the battery pack except for the single battery to be detected as a standard value;
the detection device is specifically used for measuring the insulation resistance between each single battery to be detected and the adjacent single battery shell;
the detection device is specifically further configured to determine that the grouped detection result of the battery cell to be detected is abnormal in a group if the insulation resistance of the battery cell to be detected and the insulation resistance of the adjacent battery cell are smaller than the standard value.
11. The apparatus according to any one of claims 8 to 10,
the detection device is specifically used for calculating and obtaining the self-discharge rate of the test battery pack in multiple time periods aiming at the test battery pack formed by the battery monomers except the battery monomer to be detected in the battery pack;
the detection device is specifically used for fitting to obtain a standard self-discharge curve based on the self-discharge rate of the test battery pack in the multiple time periods;
the detection device is specifically used for calculating and obtaining the self-discharge rate of each single battery to be detected;
the detection device is specifically used for obtaining a battery detection result of the battery to be detected by comparing the self-discharge rate of the battery to be detected with the relative position of the standard self-discharge curve.
12. The apparatus of claim 11,
the detection device is specifically used for acquiring the static voltage of the test battery pack at multiple moments aiming at the test battery pack formed by the battery monomers except the battery monomer to be detected in the battery pack;
the detection device is specifically further configured to obtain a duration of a corresponding time period by subtracting adjacent times according to the static voltages of the test battery pack at the multiple times; obtaining the difference of the static voltages at the adjacent moments to obtain the change value of the static voltage in the corresponding time period;
the detection device is specifically configured to calculate, for each period, a ratio of a change value of the static voltage in the period to a duration of the period, so as to obtain a self-discharge rate of the test battery pack in the plurality of periods.
13. The apparatus of claim 11,
the detection device is specifically used for disconnecting the assembly between the battery monomer to be detected and other battery monomers aiming at each battery monomer to be detected;
the detection device is specifically used for discharging the battery monomer to be detected to cut-off voltage, standing, charging to preset electric quantity and standing.
14. The apparatus of claim 11,
the detection device is specifically configured to determine that the battery detection result of the battery cell to be detected is abnormal in self-discharge if the position of the self-discharge rate of the battery cell to be detected in the coordinate system is located above the standard self-discharge curve in the coordinate system.
15. An electronic device, comprising: a processor, and a memory communicatively coupled to the processor;
the memory stores computer execution instructions;
the processor executes computer-executable instructions stored by the memory to implement the method of any of claims 1-7.
16. A computer-readable storage medium having computer-executable instructions stored therein, which when executed by a processor, are configured to implement the method of any one of claims 1-7.
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| CN202210675223.2A CN114966433A (en) | 2022-06-15 | 2022-06-15 | Method, device, equipment and medium for positioning self-discharge abnormity of battery pack |
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| CN202210675223.2A CN114966433A (en) | 2022-06-15 | 2022-06-15 | Method, device, equipment and medium for positioning self-discharge abnormity of battery pack |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116165562A (en) * | 2023-04-25 | 2023-05-26 | 江苏时代新能源科技有限公司 | Battery self-discharge detection method, device, apparatus, storage medium and program product |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116165562A (en) * | 2023-04-25 | 2023-05-26 | 江苏时代新能源科技有限公司 | Battery self-discharge detection method, device, apparatus, storage medium and program product |
| CN116165562B (en) * | 2023-04-25 | 2023-10-03 | 江苏时代新能源科技有限公司 | Battery self-discharge detection method, device, apparatus, storage medium and program product |
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