Method, device and storage medium for detecting charging anomaly

Abstract

The embodiment of the application provides a charging abnormality detection method and device and a storage medium, and belongs to the technical field of battery charging. According to the continuous n sampling voltages of the first electric core between the end time of the i charging stage in the k charging and the end time of the i+1 charging stage, the first minimum voltage in the n sampling voltages is determined to correspond to the first sampling time. The second minimum voltage in any one of the previous k-1 charging processes can be determined to correspond to the second sampling time in the same way. Then, according to the first minimum voltage and the second minimum voltage, the k charging abnormality is determined, or according to the change rate of the sampling voltage in the first period after the first sampling time in the k charging process and the change rate of the sampling voltage in the second period after the second sampling time in any one of the previous k-1 charging processes, the k charging abnormality is determined. The accuracy of detecting the charging abnormality is higher, and the misjudgment rate can be effectively reduced.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of battery charging, and in particular to a charging abnormality detection method and device and a storage medium. BACKGROUND

[0002] Lithium ion batteries are widely used in consumer electronics due to their high energy density, and with the development of electric vehicles, lithium ion battery packs have become the development trend of lithium ion batteries as a power source. The battery management system (BMS) as an application system for controlling the charge and discharge cycle of the lithium ion battery pack controls the lithium ion battery pack to charge and discharge according to a certain mode. However, as the battery ages, the performance of the battery will decline, and there may be safety risks during subsequent battery charging, so it is necessary to detect whether the battery charging process is abnormal.

[0003] Currently, the BMS detects whether the battery charging process is abnormal in the following two ways. The first way: if the voltage difference between the maximum voltage and the minimum voltage of any cell in the battery during a certain charging process is greater than a voltage threshold, it is considered that the battery in which the cell is located has an abnormality during the charging process. The second way: if the voltage of any cell in the battery suddenly drops during a certain charging process, it is considered to be an abnormal attenuation of the voltage, and it is considered that the battery in which the cell is located has an abnormality during the charging process.

[0004] However, the related art roughly equates abnormal changes in voltage during the entire charging process to battery charging abnormalities, which is not very accurate and has a high misjudgment rate. SUMMARY

[0005] In view of the above problems, embodiments of the present application provide a battery, a power consumption device, a battery charging method and device, which ensure that the capacity that can be discharged after the battery is fully charged does not decay with the aging of the battery.

[0006] According to a first aspect of the embodiments of the present application, a charging abnormality detection method is provided, which comprises:

[0007] In the kth charging of the battery, the first cell is obtained from the end time of the ith charging phase to the end time of the ith+1 charging phase. The first cell is any one of the cells in the battery, the charging current of the ith charging phase is greater than the charging current of the ith+1 charging phase, i is greater than or equal to 1, k is greater than or equal to 2, and n is greater than 2.

[0008] According to the continuous n sampling voltages, the first minimum voltage in the n sampling voltages is determined, and the first sampling time corresponding to the first minimum voltage is determined.

[0009] determine the kth charging abnormality according to the first minimum voltage and the second minimum voltage, and / or according to a change rate of the sampling voltage in the first time period in the kth charging process and a change rate of the sampling voltage in the second time period in the Lth charging process;

[0010] wherein the second minimum voltage is a minimum voltage of the first battery cell between an end time of the ith charging stage and an end time of the ith+1 charging stage in the Lth charging process, the sampling time of the second minimum voltage is the second sampling time, and the Lth charging process is any one of the previous k-1 charging processes; the first time period is a time period after the first sampling time, the second time period is a time period after the second sampling time, and the length of the first time period is equal to the length of the second time period.

[0011] In the embodiments of the present application, the first sampling time corresponding to the first minimum voltage is determined according to the continuous n sampling voltages of the first battery cell between the end time of the ith charging stage and the end time of the ith+1 charging stage in the kth charging process. The second sampling time corresponding to the second minimum voltage in any one of the previous k-1 charging processes can be determined in the same manner. Then, the kth charging abnormality is determined according to the first minimum voltage and the second minimum voltage, or according to the change rate of the sampling voltage in the first time period after the first sampling time in the kth charging process and the change rate of the sampling voltage in the second time period after the second sampling time in any one of the previous k-1 charging processes. In the present application, the charging current of the ith charging stage is greater than the charging current of the ith+1 charging stage. The kth charging abnormality is determined according to the change of the sampling voltage and / or the change of the change rate of the sampling voltage during the process of switching from large current charging to small current charging of the battery. The accuracy of detecting the charging abnormality is higher, and the misjudgment rate can be effectively reduced.

[0012] Optionally, the continuous n sampling voltages include an mth sampling voltage at an mth sampling time to an m+n-1th sampling voltage at an m+n-1th sampling time. The first sampling time corresponding to the first minimum voltage in the n sampling voltages is determined according to the continuous n sampling voltages, including:

[0013] the mth sampling voltage at the mth sampling time is determined as the minimum voltage;

[0014] if the sampling voltage at the m+jth sampling time is less than the sampling voltage at the m+j-1th sampling time, the minimum voltage is updated with the sampling voltage at the m+jth sampling time;

[0015] if the sampling voltage at the m+jth sampling time is less than or equal to the sampling voltages at the m+j+1th sampling time to the m+n-1th sampling time, the m+jth sampling time is determined as the first sampling time corresponding to the first minimum voltage, j is greater than or equal to 1 and less than or equal to n-2, and m is greater than or equal to 1.

[0016] In the embodiments of the present application, through the above dynamic cycle steps, the first sampling time corresponding to the first minimum voltage is determined while the sampling voltage is obtained, which can reduce the number of sampling voltages required to determine the first sampling time corresponding to the first minimum voltage, thereby improving the efficiency of determining the first sampling time corresponding to the first minimum voltage, and reducing the data processing pressure in the process.

[0017] Optionally, the kth charging abnormality is determined according to the first minimum voltage and the second minimum voltage, including:

[0018] If the first minimum voltage is greater than the second minimum voltage, the kth charging abnormality is determined.

[0019] As the number of battery charging cycles increases, the internal resistance of the battery will increase, and when the large current charging is switched to the small current charging, the voltage of the battery will gradually decrease. If the voltage of the battery does not decrease but increases during this switching process, it indicates that the internal resistance of the battery has decreased, which can further indicate that the battery charging is abnormal. In the embodiments of the present application, when the first minimum voltage of the kth charging process is greater than the second minimum voltage of any one of the previous k-1 charging processes, the kth charging abnormality is determined, the accuracy of detecting the charging abnormality is higher, and the misjudgment rate can be effectively reduced.

[0020] Optionally, the kth charging abnormality is determined according to the change rate of the sampling voltage in the first time period in the kth charging process and the change rate of the sampling voltage in the second time period in the Lth charging process, including:

[0021] If the change rate of the sampling voltage in the first time period in the kth charging process is less than the change rate of the sampling voltage in the second time period in the Lth charging process, the kth charging abnormality is determined.

[0022] In the embodiments of the present application, as the number of battery charging cycles increases, when the large current charging is switched to the small current charging, the internal resistance of the battery will increase. The internal resistance of the battery can be measured by the change rate of the sampling voltage over time, therefore, based on this rule, when the change rate of the sampling voltage in the first time period in the kth charging process is less than the change rate of the sampling voltage in the second time period in the Lth charging process, the kth charging abnormality is determined, the accuracy of detecting the charging abnormality is higher, and the misjudgment rate can be effectively reduced.

[0023] Optionally, the method further includes:

[0024] updating the number of battery charging abnormalities to obtain the cumulative number of charging abnormalities;

[0025] When the cumulative number of charging abnormalities exceeds a preset number, stop charging the battery.

[0026] In the embodiments of the present application, when the accumulated number of charging abnormality times exceeds the preset number, the charging of the battery is stopped, so that the safe charging of the battery can be ensured. Moreover, only when the accumulated number of charging abnormality times exceeds the preset number, the BMS stops the charging of the battery, so that the charging of the battery is not stopped due to the misjudgment of the charging abnormality of the battery caused by the fluctuation of the sampling voltage.

[0027] Optionally, the charging current of the i th charging stage is a first current, the charging current of the i+1 th charging stage is a second current, the first current is greater than the second current, and the continuous n sampling voltages of the first electric core between the end time of the i th charging stage and the end time of the i+1 th charging stage are obtained.

[0028] If the current difference between the first current and the second current is greater than the current threshold, the first current is directly switched to the second current, and the n sampling voltages are obtained at the m th sampling time to the m+n-1 th sampling time after the first current is switched to the second current.

[0029] If the current difference is less than or equal to the current threshold, the first current is switched to a third current first, and then the third current is switched to the second current, and the n sampling voltages are obtained at the m th sampling time to the m+n-1 th sampling time after the third current is switched to the second current, the third current is greater than the first current.

[0030] In the embodiments of the present application, when the current difference between the first current and the second current is less than or equal to the current threshold, the first current is switched to a larger third current first, and then the third current is switched to the second current, and the n sampling voltages are obtained at the m th sampling time to the m+n-1 th sampling time after the third current is switched to the second current, which can amplify the sampling voltage characteristic signal, so as to accurately determine the k th charging abnormality.

[0031] According to a second aspect of the embodiments of the present application, a charging abnormality detection device is provided, which comprises:

[0032] The processing module is configured to, in the k th charging of the battery, obtain the continuous n sampling voltages of the first electric core between the end time of the i th charging stage and the end time of the i+1 th charging stage, the first electric core being any one of the electric cores in the battery, the charging current of the i th charging stage being greater than the charging current of the i+1 th charging stage, i being greater than or equal to 1, k being greater than or equal to 2, and n being greater than 2.

[0033] The processing module is further configured to determine, according to the continuous n sampling voltages, the first sampling time corresponding to the first minimum voltage in the n sampling voltages.

[0034] The processing module is further configured to determine the kth charging abnormality according to the first minimum voltage and the second minimum voltage, and / or according to a variation rate of the sampling voltage in the first time period in the kth charging process and a variation rate of the sampling voltage in the second time period in the Lth charging process.

[0035] The second minimum voltage is a minimum voltage of the first battery cell between an end time of an i-th charging stage and an end time of an i+1-th charging stage in an Lth charging process, and the sampling time of the second minimum voltage is the second sampling time. The Lth charging process is any one of the previous k-1 charging processes. The first time period is a time period after the first sampling time, and the second time period is a time period after the second sampling time. The length of the first time period is equal to the length of the second time period.

[0036] Optionally, the continuous n sampling voltages include an m-th sampling voltage at an m-th sampling time and an m+n-1-th sampling voltage at an m+n-1-th sampling time. The processing module is further configured to:

[0037] determine the m-th sampling voltage at the m-th sampling time as the minimum voltage;

[0038] if the sampling voltage at the m+j-th sampling time is less than the sampling voltage at the m+j-1-th sampling time, update the minimum voltage with the sampling voltage at the m+j-th sampling time;

[0039] if the sampling voltage at the m+j-th sampling time is less than or equal to the sampling voltages at the m+j+1-th sampling time to the m+n-1-th sampling time, determine the m+j-th sampling time as the first sampling time corresponding to the first minimum voltage, where j is greater than or equal to 1 and less than or equal to n-2, and m is greater than or equal to 1.

[0040] Optionally, the processing module is further configured to:

[0041] if the first minimum voltage is greater than the second minimum voltage, determine the kth charging abnormality.

[0042] Optionally, the processing module is further configured to:

[0043] if the variation rate of the sampling voltage in the first time period in the kth charging process is less than the variation rate of the sampling voltage in the second time period in the Lth charging process, determine the kth charging abnormality.

[0044] Optionally, the processing module is further configured to:

[0045] update the number of battery charging abnormalities to obtain an accumulated number of charging abnormalities.

[0046] The charging abnormality detection device further includes a charging module configured to stop charging the battery when the accumulated number of charging abnormalities exceeds a preset number.

[0047] Optionally, the charging current of the i-th charging phase is a first current, the charging current of the i+1-th charging phase is a second current, the first current is greater than the second current, and the processing module is further configured to:

[0048] If the current difference between the first current and the second current is greater than the current threshold, the first current is directly switched to the second current, and the n sampling voltages are obtained at the m-th sampling moment to the m+n-1-th sampling moment after the first current is switched to the second current.

[0049] If the current difference is less than or equal to the current threshold, the first current is first switched to a third current, and then the third current is switched to the second current, and the n sampling voltages are obtained at the m-th sampling moment to the m+n-1-th sampling moment after the third current is switched to the second current, the third current being greater than the first current.

[0050] According to a third aspect of the embodiments of the present application, a battery is provided, which comprises the charging anomaly detection device of the second aspect.

[0051] According to a fourth aspect of the embodiments of the present application, a charging device is provided, which is configured to charge a battery, and the charging device comprises the charging anomaly detection device of the second aspect.

[0052] According to a fifth aspect of the embodiments of the present application, a computer readable storage medium is provided, which stores a computer program, and the computer program is configured to be executed by a processor to implement the charging anomaly detection method of the first aspect.

[0053] According to a sixth aspect of the embodiments of the present application, an electronic device is provided, which comprises:

[0054] a processor; and

[0055] a memory configured to store executable instructions of the processor;

[0056] The processor is configured to execute the charging anomaly detection method of the first aspect by executing the executable instructions.

[0057] In the embodiment of the present application, the first minimum voltage corresponding to the first sampling time is determined according to the continuous n sampling voltages of the first battery cell between the end time of the i th charging stage and the end time of the i+1 th charging stage in the k th charging. The second minimum voltage corresponding to the second sampling time in the charging process of any one of the previous k-1 times can be determined based on the same method. Then, the k th charging abnormality is determined according to the first minimum voltage and the second minimum voltage, or the k th charging abnormality is determined according to the change rate of the sampling voltage in the first time period after the first sampling time in the k th charging process and the change rate of the sampling voltage in the second time period after the second sampling time in the charging process of any one of the previous k-1 times. In the present application, the charging current of the i th charging stage is greater than the charging current of the i+1 th charging stage, and the k th charging abnormality is determined according to the change of the sampling voltage and / or the change rate of the sampling voltage in the process of switching the battery from large current charging to small current charging. The accuracy of detecting the charging abnormality is higher, and the misjudgment rate can be effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0058] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating any creative labor.

[0059] Figure 1 The flowchart of a charging abnormality detection method provided by the embodiment of the present application.

[0060] Figure 2 The flowchart of another charging abnormality detection method provided by the embodiment of the present application.

[0061] Figure 3 The structural diagram of a charging abnormality detection device provided by the embodiment of the present application.

[0062] Figure 4 The structural diagram of another charging abnormality detection device provided by the embodiment of the present application. DETAILED DESCRIPTION

[0063] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creating any creative labor are within the scope of protection of the present application.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application.

[0065] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment.

[0066] Figure 1 A flowchart of a charging abnormality detection method provided in an embodiment of the application is shown. The method can be applied to a charging abnormality detection device, which includes a main body and a battery disposed in the main body, and the battery is used to provide electric energy. The device can be a vehicle, such as a new energy vehicle, which can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc. The main body of the vehicle is provided with a drive motor, which is electrically connected with the battery and is provided with electric energy by the battery, and the drive motor is connected with the wheels on the main body of the vehicle through a transmission mechanism, thereby driving the vehicle to travel. Alternatively, the device can also be a drone or a ship, etc.

[0067] The battery in the embodiment of the application can be a lithium ion battery, a lithium metal battery, a lead-acid battery, a nickel-separation battery, a nickel-hydrogen battery, a lithium-sulfur battery, a lithium-air battery, or a sodium-ion battery, etc., without specific limitation in the embodiment of the application. In terms of the scale of the battery, it can be a battery cell or a battery monomer, or a battery module or a battery pack, without specific limitation in the embodiment of the application. In addition, the battery in the embodiment of the application includes a battery management system (BMS), and the method can be specifically applied to the BMS. Of course, the BMS in the embodiment of the application can also be a separate device or equipment, and the abnormal charging of the battery can be detected by the BMS according to the charging abnormality detection method provided in the embodiment of the application. As shown in the figure, the method includes: Figure 1

[0068] Step 101: In the kth charging of the battery, the first battery cell is obtained from the end time of the ith charging phase to the end time of the ith+1 charging phase.

[0069] Wherein, the first battery cell is any one of the battery cells in the battery, the charging current of the ith charging phase is greater than the charging current of the ith+1 charging phase, i is greater than or equal to 1, k is greater than or equal to 2, and n is greater than 2.​

[0070] Step 102: determining a first sampling time corresponding to a first minimum voltage in the n sampling voltages according to the n sampling voltages.

[0071] Step 103: determining the kth charging abnormality according to the first minimum voltage and the second minimum voltage, and / or according to a change rate of the sampling voltage in the first time period after the first sampling time in the kth charging process and a change rate of the sampling voltage in the second time period after the second sampling time in the Lth charging process.

[0072] wherein the second minimum voltage is a minimum voltage of the first battery cell between an end time of the i charging stage and an end time of the i+1 charging stage in the Lth charging process, the sampling time of the second minimum voltage is the second sampling time, the Lth charging process is any one of the previous k-1 charging processes; the first time period is a time period after the first sampling time, the second time period is a time period after the second sampling time, and the length of the first time period is equal to the length of the second time period.

[0073] With the increase of the number of battery charging cycles, the internal resistance of the battery will increase, and when the battery is switched from large current charging to small current charging, the voltage of the battery will gradually decrease. If the voltage of the battery does not decrease but increases during this switching process, it indicates that the internal resistance of the battery has decreased, which can further indicate that the battery charging is abnormal.

[0074] In the embodiments of the present application, the first sampling time corresponding to the first minimum voltage in the n sampling voltages of the first battery cell between the end time of the i charging stage and the end time of the i+1 charging stage in the kth charging process is determined. The second sampling time corresponding to the second minimum voltage in the previous k-1 charging processes can be determined in the same way. Then, the kth charging abnormality is determined according to the first minimum voltage and the second minimum voltage, or according to the change rate of the sampling voltage in the first time period after the first sampling time in the kth charging process and the change rate of the sampling voltage in the second time period after the second sampling time in the previous k-1 charging processes. In the present application, the charging current of the i charging stage is greater than the charging current of the i+1 charging stage. The kth charging abnormality is determined according to the change of the sampling voltage and / or the change rate of the sampling voltage during the switching process of the battery from large current charging to small current charging. The accuracy of detecting the charging abnormality is higher, and the false positive rate can be effectively reduced.

[0075] Figure 2 The flowchart of another charging abnormality detection method provided by the embodiments of the present application is shown. The following will be described by taking the charging of the battery by the charging pile as an example, but the charging method of the battery is not limited in the embodiments of the present application. For example, as shown in the figure, the method comprises the following steps. Figure 2 ​

[0076] Step 201: In the kth charging of the battery, the BMS acquires the continuous n sampling voltages of the first cell from the end time of the ith charging stage to the end time of the ith+1 charging stage.

[0077] Wherein, the battery includes a plurality of cells, and the first cell is any one of the cells in the battery. The charging current of the ith charging stage is greater than the charging current of the ith+1 charging stage, i is greater than or equal to 1, k is greater than or equal to 2, and n is greater than 2.

[0078] It should be noted that the battery is currently charged by a step charging method. For any charging of the battery, it includes a plurality of charging stages. The charging current of each charging stage is constant, and the charging current of the previous charging stage is greater than the charging current of the subsequent charging stage. In this way, each charging of the battery needs to be charged at a larger charging current for a stage, and then the larger charging current is switched to a smaller charging current for another stage, and so on, to complete the single charging of the battery. In this way, there are multiple current switching in each charging of the battery, and there is a current switching point between adjacent two charging stages, and the current switching point corresponds to the end time of the previous charging stage.

[0079] For example, the kth charging of the battery can include the 1st charging stage, the 2nd charging stage and the 3rd charging stage. The charging current of the 1st charging stage can be 300A (ampere), the charging current of the 2nd charging stage can be 200A, and the charging current of the 3rd charging stage can be 150A. In this way, there are 2 current switching and 2 current switching points in the kth charging of the battery, the 1st current switching switches the charging current from 300A to 200A, the 2nd current switching switches the charging current from 200A to 150A, the 1st charging stage corresponds to the 1st current switching point, and the 2nd charging stage corresponds to the 2nd current switching point. It can be understood that the above charging stages and charging currents can be set or adjusted based on system design or requirements, and the embodiments of the present application are not limited.

[0080] In addition, in the kth charging of the battery, the BMS can acquire the continuous sampling voltage of any cell in the battery, and can acquire the continuous sampling voltage of the cell between any two adjacent current switching points. The embodiments of the present application can judge the abnormality of the kth charging of the battery according to the continuous sampling voltage of any cell in the battery between any two adjacent current switching points, and the embodiments of the present application are not limited.

[0081] Further, in the kth charging of the battery, the BMS can collect the continuous n sampling voltages of any cell in the battery between any two adjacent current switching points in real time. Of course, in order to reduce the sampling energy consumption, a preset sampling interval can also be set to collect the voltage once every preset sampling interval to obtain the continuous n sampling voltages. For example, the sampling interval can be 100 ms (milliseconds), 110 ms, 150 ms, etc., which is not limited in the embodiments of the present application.

[0082] For example, the continuous n sampling voltages between the end time of the i charging stage in the kth charging and the end time of the i+1 charging stage can be all the sampling voltages between the end time of the i charging stage in the kth charging and the end time of the i+1 charging stage. In order to reduce the data processing pressure, the continuous n sampling voltages can also be part of the sampling voltages between the end time of the i charging stage in the kth charging and the end time of the i+1 charging stage, but no matter how many the number of the part of the sampling voltages is, the part of the continuous sampling voltages should include the first minimum voltage corresponding to the first sampling time, the sampling voltages collected before the first sampling time and continuous with the first minimum voltage, and the sampling voltages collected after the first sampling time and continuous with the first minimum voltage. Preferably, the number of the sampling voltages collected after the first sampling time and continuous with the first minimum voltage included in the part of the sampling voltages can be greater than or equal to 2, which can avoid the fluctuation of the sampling voltages to reduce the accuracy of determining the first sampling time corresponding to the first minimum voltage in the n sampling voltages in step 202.

[0083] For example, it is assumed that there are 6 sampling voltages between the end time of the i-th charging phase and the end time of the i+1-th charging phase in the k-th charging of the battery, and the end time of the i-th charging phase corresponds to the 1st sampling voltage, the first sampling time between the end time of the i-th charging phase and the end time of the i+1-th charging phase corresponds to the 4th sampling voltage (i.e., the first minimum voltage), and the end time of the i+1-th charging phase corresponds to the 6th sampling voltage. In other words, there are 6 continuous sampling voltages in time sequence. Then, the BMS in the application can obtain the 6 continuous sampling voltages, and detect the k-th charging anomaly of the battery according to the 6 continuous sampling voltages. Part of the continuous sampling voltages in the 6 continuous sampling voltages can also be obtained, and the k-th charging anomaly of the battery can be detected according to the part of the continuous sampling voltages. For example, the part of the continuous sampling voltages can be 3 continuous sampling voltages, which can include the 3rd sampling voltage to the 5th sampling voltage. The part of the sampling voltages can also be 4 continuous sampling voltages, which can include the 3rd sampling voltage to the 6th sampling voltage, or the 2nd sampling voltage to the 5th sampling voltage. The part of the sampling voltages can also be 5 continuous sampling voltages, which can include the 2nd sampling voltage to the 6th sampling voltage, or the 1st sampling voltage to the 5th sampling voltage.

[0084] In some embodiments, it is assumed that the charging current of the i-th charging phase is a first current, the charging current of the i+1-th charging phase is a second current, the first current is greater than the second current, but the current difference between the first current and the second current is small. The voltage characteristic signal of the continuous n sampling voltages of the first cell between the end time of the i-th charging phase and the end time of the i+1-th charging phase will not be obvious, which will not be conducive to accurately determining the k-th charging anomaly. Therefore, a current excitation can be added between the first current and the second current to amplify the voltage characteristic signal.

[0085] Specifically, when the BMS obtains the continuous n sampling voltages of the first cell between the end time of the i-th charging phase and the end time of the i+1-th charging phase, a current threshold can be preset, and the current difference between the first current and the second current is compared with the current threshold. If the current difference between the first current and the second current is greater than the current threshold, the first current is directly switched to the second current, and n sampling voltages are obtained at the mth sampling time to the m+n-1th sampling time after the first current is switched to the second current. If the current difference is less than or equal to the current threshold, the first current is switched to a third current first, and then the third current is switched to the second current, and n sampling voltages are obtained at the mth sampling time to the m+n-1th sampling time after the third current is switched to the second current, and the third current is greater than the first current.

[0086] For example, the current threshold is 70A, the first current is 30A, and the second current is 25A. Since 30A minus 25A equals 5A, which is less than 70A, if the current is directly switched from 30A to 25A, the voltage characteristic signal of the sampling voltage obtained after the current is switched from 30A to 25A will not be obvious, which is not conducive to accurately determining the kth charging anomaly. Therefore, the third current can be set to 100A, and the current is first switched from 30A to 100A, and then the current is switched from 100A to 25A, to realize the switching from the first current to the second current. Since 100A minus 25A equals 75A, which is greater than 70A, the voltage characteristic signal of the sampling voltage obtained after the current is switched from 100A to 25A will be more obvious, which is conducive to accurately determining the kth charging anomaly.

[0087] Step 202: The BMS determines, according to the continuous n sampling voltages, a first sampling time corresponding to a first minimum voltage in the n sampling voltages.

[0088] In a possible implementation, the BMS can sort the continuous n sampling voltages in descending order, determine the sampling voltage at the last position in the sorting as the first minimum voltage, and determine the sampling time corresponding to the first minimum voltage as the first sampling time. In the first example, the number of the continuous n sampling voltages is 5, and the five continuous sampling voltages are 180V, 165V, 125V, 139V, and 150V in the order of sampling time. The five continuous sampling voltages are sorted in descending order as 180V>165V>150V>139V>125V. 125V is the sampling voltage at the last position in the sorting, and therefore 125V can be determined as the first minimum voltage, and the sampling time corresponding to 125V can be determined as the first sampling time.

[0089] When there are multiple minimum sampling voltages in the continuous n sampling voltages, in other words, the last few sampling voltages in the continuous n sampling voltages are the same, any one of the multiple minimum sampling voltages can be determined as the first minimum voltage, or the sampling voltage at the first position in the sampling time among the multiple minimum sampling voltages can be determined as the first minimum voltage, and the sampling time corresponding to the first minimum voltage is determined as the first sampling time. In the second example, the number of the continuous n sampling voltages is 5, and the five sampling voltages are 180V, 165V, 139V, 139V, and 139V in the order of sampling time. The five sampling voltages are sorted in descending order as 180V>165V>139V=139V=139V. There are three minimum sampling voltages 139V, and therefore 139V can be determined as the first minimum voltage, and the sampling time corresponding to the 139V at the first position in the sampling time among the three 139V is determined as the first sampling time.

[0090] In another possible mode, the continuous n sampling voltages include an mth sampling voltage at an mth sampling moment and an (m+n-1)th sampling voltage at an (m+n-1)th sampling moment. The BMS can implement step 202 through steps (1) to (3) as follows:

[0091] Step (1): determining the mth sampling voltage at the mth sampling moment as the minimum voltage. Step (2): if the sampling voltage at the (m+j)th sampling moment is less than the sampling voltage at the (m+j-1)th sampling moment, updating the minimum voltage with the sampling voltage at the (m+j)th sampling moment. Step (3): if the sampling voltage at the (m+j)th sampling moment is less than or equal to the sampling voltages at the (m+j+1)th to (m+n-1)th sampling moments, determining the (m+j)th sampling moment as the first sampling moment corresponding to the first minimum voltage, j being greater than or equal to 1 and less than or equal to n-2, and m being greater than or equal to 1.

[0092] It should be noted that, in order to determine the first sampling moment corresponding to the first minimum voltage in the continuous n sampling voltages, the minimum voltage can be assigned an initial value first, and then the subsequent sampling voltages are compared with the initial value, and the real value of the minimum voltage is determined through multiple loops, the real value is determined as the first minimum voltage, and the sampling moment corresponding to the real value is determined as the first sampling moment.

[0093] In the first case, referring to the numerical examples in the first example above, n is equal to 5, and it is assumed that m is equal to 1, the first sampling voltage at the first sampling moment in the continuous 5 sampling voltages is 180V, the second sampling voltage at the second sampling moment is 165V, the third sampling voltage at the third sampling moment is 125V, the fourth sampling voltage at the fourth sampling moment is 139V, and the fifth sampling voltage at the fifth sampling moment is 150V. Then, the first sampling voltage at the first moment 180V can be determined as the minimum voltage through step (1). When j=1, in step (2), since the sampling voltage at the second sampling moment 165V is less than 180V, the minimum voltage is updated with the sampling voltage at the second sampling moment 165V, that is, the minimum voltage is updated from 180V to 165V. In step (3), since the sampling voltage at the second sampling moment 165V is greater than the sampling voltage at the third sampling moment 125V, step (2) is returned to be executed. When j=2, in step (2), since the sampling voltage at the third sampling moment 125V is less than 165V, the minimum voltage is updated with the sampling voltage at the third sampling moment 125V, that is, the minimum voltage is updated from 165V to 125V. In step (3), since the sampling voltage at the third sampling moment 125V is less than the sampling voltage at the fourth sampling moment 139V and the sampling voltage at the fifth sampling moment 150V, the third sampling moment is determined as the first sampling moment, and 125V is determined as the first minimum voltage.

[0094] In the second case, referring to the numerical example in the second example above, n equals 5, and m equals 1, the first sampling voltage at the first sampling time in the consecutive 5 sampling voltages is 180V, the second sampling voltage at the second sampling time is 165V, the third sampling voltage at the third sampling time is 139V, the fourth sampling voltage at the fourth sampling time is 139V, and the fifth sampling voltage at the fifth sampling time is 139V. Then, the first sampling voltage 180V at the first time is determined as the minimum voltage through step (1). When j = 1, in step (2), since the second sampling voltage 165V at the second sampling time is less than 180V, the second sampling voltage 165V at the second sampling time is used to update the minimum voltage, that is, the minimum voltage is updated from 180V to 165V. In step (3), since the second sampling voltage 165V at the second sampling time is greater than the third sampling voltage 139V at the third sampling time, step (2) is returned to be executed. When j = 2, in step (2), since the third sampling voltage 139V at the third sampling time is less than 165V, the third sampling voltage 139V at the third sampling time is used to update the minimum voltage, that is, the minimum voltage is updated from 165V to 139V. In step (3), since the third sampling voltage 139V at the third sampling time is equal to the fourth sampling voltage 139V at the fourth sampling time, and is also equal to the fifth sampling voltage 139V at the fifth sampling time, the third sampling time is determined as the first sampling time, and 139V is determined as the first minimum voltage.

[0095] It is worth noting that through the dynamic loop steps of steps (1) to (3) above, the first sampling time corresponding to the first minimum voltage is determined while the sampling voltages are obtained, which can reduce the number of sampling voltages required to determine the first sampling time corresponding to the first minimum voltage, thereby improving the efficiency of determining the first sampling time corresponding to the first minimum voltage, and reducing the data processing pressure in the process.

[0096] It is also noted that according to the consecutive n sampling voltages of the first electric core between the end time of the i th charging stage and the end time of the i + 1 th charging stage in the k th charging process, the first minimum voltage in the consecutive n sampling voltages of the first electric core and the first sampling time corresponding to the first minimum voltage can be determined. For any one of the first k - 1 charging processes of the battery, the BMS can determine the second minimum voltage of the first electric core in the charging process and the second sampling time corresponding to the second minimum voltage in the manner of the k th charging process described above. The second minimum voltage is the minimum voltage in the consecutive sampling of the first electric core between the end time of the i th charging stage and the end time of the i + 1 th charging stage in the L th charging process, and the L th charging process is any one of the first k - 1 charging processes. Then, the BMS can store the charging process, the sampling stage, and the minimum voltage in the sampling stage and the sampling time of the minimum voltage corresponding to each other for subsequent use.

[0097] Step 203: The BMS determines the kth charging abnormality according to the first minimum voltage and the second minimum voltage.

[0098] As the internal resistance of the battery increases with the increase of the charging cycle number of the battery, the voltage of the battery gradually decreases when switching from large current charging to small current charging. If the voltage of the battery does not decrease but increases during the switching process, it indicates that the internal resistance of the battery decreases, which can further indicate that the battery charging is abnormal. Therefore, whether the kth charging is abnormal can be determined by the size relationship between the first minimum voltage of the kth charging process and the second minimum voltage of any one of the previous k-1 charging processes.

[0099] Exemplarily, the implementation process of step 203 can be: if the first minimum voltage is greater than the second minimum voltage, it is determined that the kth charging is abnormal.

[0100] The BMS can determine the kth charging abnormality when it is determined that the first minimum voltage is greater than the second minimum voltage. The BMS can determine the kth charging abnormality when it is determined that the first minimum voltage in the kth charging process is greater than the second minimum voltage in any one of the previous k-1 charging processes. For example, assuming that k is equal to 3, the first minimum voltage determined by the BMS according to the sampling voltage in the 3rd charging process is 125V, the second minimum voltage determined by the BMS according to the sampling voltage in the 1st charging process is 120V, and the second minimum voltage determined by the BMS according to the sampling voltage in the 2nd charging process is 110V. Since 125V is greater than 120V, the BMS determines that the kth charging is abnormal. Alternatively, since 125V is greater than 110V, the BMS determines that the kth charging is abnormal.

[0101] In actual applications, the BMS can determine the kth charging abnormality according to the first minimum voltage and the second minimum voltage in other manners, which are not limited in the embodiments of the application.

[0102] It is worth noting that as the internal resistance of the battery increases with the increase of the charging cycle number of the battery, the voltage of the battery gradually decreases when switching from large current charging to small current charging. Based on this rule, the embodiments of the application determine the kth charging abnormality when the first minimum voltage of the kth charging process is greater than the second minimum voltage of any one of the previous k-1 charging processes, which has a higher accuracy in detecting charging abnormality and can effectively reduce the misjudgment rate.

[0103] Step 204: The BMS determines the kth charging abnormality according to the change rate of the sampling voltage in the first time period in the kth charging process and the change rate of the sampling voltage in the second time period in the Lth charging process.

[0104] The first time period is a time period after the first sampling time, and the second time period is a time period after the second sampling time. The length of the first time period is equal to the length of the second time period. The start time of the first time period can be the first sampling time, and the end time of the first time period can be the first sampling time, the second sampling time, the third sampling time, or the like. The start time of the second time period can be the second sampling time, and the end time of the second time period can be the first sampling time, the second sampling time, the third sampling time, or the like. The embodiments of the present application do not limit this, as long as the length of the first time period is equal to the length of the second time period, and the rate of change of the sampling voltage in the first time period in the kth charging process is comparable to the rate of change of the sampling voltage in the second time period in the Lth charging process. Preferably, the end time of the first time period is at least the second sampling time after the first sampling time, and the end time of the second time period is at least the second sampling time after the first sampling time, so as to avoid fluctuations in the sampling voltage and reduce the accuracy of the rate of change of the sampling voltage in the first time period in the kth charging process and the rate of change of the sampling voltage in the second time period in the Lth charging process.

[0105] As the number of battery charging cycles increases, the internal resistance of the battery increases, and when the battery is switched from large current charging to small current charging, the voltage of the battery gradually decreases. If the internal resistance of the battery does not increase but decreases during this switching process, it can further indicate that the battery charging is abnormal. The internal resistance of the battery can be measured by the rate of change of the sampling voltage over time, so the size relationship between the rate of change of the sampling voltage in the first time period in the kth charging process and the rate of change of the sampling voltage in the second time period in the Lth charging process can be used to determine whether the kth charging is abnormal.

[0106] For example, the implementation process of step 204 can be: if the rate of change of the sampling voltage in the first time period in the kth charging process is less than the rate of change of the sampling voltage in the second time period in the Lth charging process, it is determined that the kth charging is abnormal.

[0107] The BMS can determine that the kth charging is abnormal when the rate of change of the sampled voltage in the first time period during the kth charging is less than the rate of change of the sampled voltage in the second time period during the k-1th charging. The BMS can also determine that the kth charging is abnormal when the rate of change of the sampled voltage in the first time period during the kth charging is less than the rate of change of the sampled voltage in the second time period during any one of the k-1th chargings. For example, assuming that k is equal to 3, the rate of change of the sampled voltage in the first time period determined by the BMS according to the sampled voltage during the 3th charging is 4, the rate of change of the sampled voltage in the second time period determined by the BMS according to the sampled voltage during the 1th charging is 4.5, and the rate of change of the sampled voltage in the second time period determined by the BMS according to the sampled voltage during the 2th charging is 5. Since 4 is less than 4.5, the BMS determines that the kth charging is abnormal. Alternatively, since 4 is less than 5, the BMS determines that the kth charging is abnormal.

[0108] In the above embodiments, the BMS can determine the rate of change of the sampled voltage in the first time period during the kth charging by subtracting the first minimum voltage from the last sampled voltage in the first time period, and then dividing the first voltage difference by the length of the first time period. Similarly, the BMS can determine the rate of change of the sampled voltage in the second time period during the Lth charging by subtracting the second minimum voltage from the last sampled voltage in the second time period, and then dividing the second voltage difference by the length of the second time period.

[0109] In actual applications, the BMS can determine the kth charging to be abnormal according to the rate of change of the sampled voltage in the first time period during the kth charging and the rate of change of the sampled voltage in the second time period during the Lth charging in other manners, which are not limited in the embodiments of the present application.

[0110] It is worth noting that as the number of charging cycles of the battery increases, the internal resistance of the battery will increase when the charging current is switched from a large current to a small current. The internal resistance of the battery can be measured by the rate of change of the sampled voltage over time. Therefore, based on this rule, when the rate of change of the sampled voltage in the first time period during the kth charging is less than the rate of change of the sampled voltage in the second time period during the Lth charging, the kth charging is determined to be abnormal, the accuracy of detecting charging abnormalities is higher, and the false positive rate can be effectively reduced.

[0111] It should be noted that, after the first sampling moment corresponding to the first minimum voltage in the kth charging process and the second sampling moment corresponding to the second minimum voltage in any one of the previous k-1 charging processes are determined through steps 201 and 202, the kth charging abnormality can be determined only through step 203, the kth charging abnormality can be determined only through step 204, and the kth charging abnormality can be determined through steps 203 and 204 simultaneously, which is not limited in the embodiments of the present application.

[0112] It should be further noted that, in the embodiments of the present application, the BMS can detect and acquire the sampling voltage of each battery cell in the battery, and the sampling voltage of any one battery cell can be used to determine the charging abnormality of the battery. Therefore, the present application can not only accurately determine whether the battery has a charging abnormality, but also determine which battery cell in the battery causes the charging abnormality. For example, the BMS determines the kth charging abnormality according to the sampling voltage of the first battery cell, and then determines that the first battery cell of the battery causes the kth charging abnormality of the battery.

[0113] After the kth charging abnormality is determined through the above steps, the embodiments of the present application can further control the charging of the battery through steps 205 and 206 to avoid the safety problem caused by continuing to charge the battery after the charging abnormality.

[0114] Step 205: The BMS updates the number of battery charging abnormalities to obtain the cumulative number of charging abnormalities.

[0115] The BMS can count and update the number of battery charging abnormalities after determining the charging abnormality each time to obtain the cumulative number of charging abnormalities. For example, when updating the number of battery charging abnormalities, the number of charging abnormalities can be increased by a preset value each time the charging abnormality is determined. The preset value can be 1, 2, 3, etc. For example, before the kth charging, the number of battery charging abnormalities is 2, if the kth charging abnormality is determined, and the preset value is 1, the number of charging abnormalities can be increased by 1 to obtain the cumulative number of charging abnormalities as 3.

[0116] It should be noted that the BMS in the embodiments of the present application can detect and acquire the continuous sampling voltage of each battery cell in the battery, and the continuous sampling voltage of any one battery cell can be used to determine the battery charging abnormality. Therefore, when the number of battery charging abnormality is counted, the number of battery charging abnormality related to different battery cells can be counted respectively to obtain the cumulative number of charging abnormality related to the battery cells. For example, assuming that the battery includes a first battery cell, a second battery cell and a third battery cell, before the kth charging, the number of battery charging abnormality related to the first battery cell is 2, the number of battery charging abnormality related to the second battery cell is 3, and the number of charging abnormality related to the third battery cell is 0, and the preset value is 1. If the kth charging abnormality is determined according to the continuous sampling voltage of the first battery cell, the number of charging abnormality related to the first battery cell is increased by 1, and the cumulative number of charging abnormality related to the first battery cell is 3. If the kth charging abnormality is determined according to the sampling voltage of the second battery cell, the number of charging abnormality related to the second battery cell is increased by 1, and the cumulative number of charging abnormality related to the second battery cell is 4. If the kth charging abnormality is determined according to the sampling voltage of the third battery cell, the number of charging abnormality related to the third battery cell is increased by 1, and the cumulative number of charging abnormality related to the third battery cell is 1.

[0117] It should be further noted that each charging of the battery includes a plurality of charging stages and current switching points, and the continuous sampling voltage between any two adjacent current switching points can be used to determine the kth charging abnormality of the battery. However, when counting the number of battery charging abnormality, for the same battery cell, no matter which two adjacent current switching points are used to determine the battery charging abnormality in the charging process, the number of charging abnormality can be updated at most once. Taking the first battery cell in the battery as an example, assuming that the kth charging of the battery includes the first current switching point, the second current switching point and the third current switching point, before the kth charging, the number of battery charging abnormality is counted to be 2. If the kth charging abnormality is determined according to the continuous sampling voltage between the first current switching point and the second current switching point, and the kth charging abnormality is also determined according to the continuous sampling voltage between the second current switching point and the third current switching point, and the preset value is 1, the number of charging abnormality can be updated only once, and the cumulative number of charging abnormality is 3, but the number of charging abnormality cannot be updated twice, and the cumulative number of charging abnormality cannot be updated to 4.

[0118] Step 206: When the cumulative number of charging abnormality exceeds the preset number, the BMS stops charging the battery.

[0119] It should be noted that the preset number of times can be set in advance, and the preset number of times can be set as needed, for example, the preset number of times can be 5, 6, etc. After obtaining the accumulated number of charging abnormal times, the BMS can determine whether the accumulated number of charging abnormal times exceeds the preset number of times, and when it is determined that the accumulated number of charging abnormal times exceeds the preset number of times, the charging of the battery is stopped, otherwise, the charging of the battery can continue. In this way, the safe charging of the battery can be ensured.

[0120] In the embodiments of the present application, the BMS can communicate with the charging pile, and the charging abnormality detection device can be provided with a charging socket. When the charging pile controls the charging gun to be inserted into the charging socket, the battery in the charging abnormality detection device can be charged, and when the charging pile controls the charging gun to be pulled out of the charging socket, the charging of the battery in the charging abnormality detection device can be ended. When the BMS determines that the accumulated number of charging abnormal times exceeds the preset number of times, an indication of charging end can be sent to the charging pile. Correspondingly, the charging pile can receive the indication and control the charging gun to be pulled out of the charging socket according to the indication to stop charging the battery. When the BMS determines that the accumulated number of charging abnormal times is less than or equal to the preset number of times, no indication of charging end is sent to the charging pile, and the charging pile will not control the charging gun to be pulled out of the charging socket, so that the charging of the battery can continue.

[0121] It should be noted that the embodiments of the present application set a preset number of times, and when the accumulated number of charging abnormal times exceeds the preset number of times, the charging of the battery is stopped, which can ensure the safe charging of the battery. Moreover, only when the accumulated number of charging abnormal times exceeds the preset number of times, the BMS stops charging the battery, which avoids the situation of mistakenly stopping the charging of the battery due to the misjudgment of the charging abnormality of the battery caused by the fluctuation of the sampling voltage.

[0122] Further, when the BMS determines that the accumulated number of charging abnormal times exceeds the preset number of times, the BMS can also perform a safety alarm to timely convey the information of the charging abnormality.

[0123] In some embodiments, the battery in the embodiments of the present application can be provided with an alarm device, which can communicate with the BMS. When the BMS determines that the accumulated number of charging abnormal times exceeds the preset number of times, an alarm indication can be sent to the alarm device. Correspondingly, the alarm device can receive the indication and alarm externally according to the indication.

[0124] The alarm device can include at least one of a buzzer and an alarm lamp. For example, when the alarm device includes a buzzer and an alarm lamp, the BMS can simultaneously or sequentially send an alarm indication to the buzzer and the alarm lamp when it is determined that the accumulated number of charging abnormal times exceeds the preset number of times. When the buzzer receives the indication, it can sound at a certain frequency. When the alarm lamp receives the indication, it can be controlled to turn on or can be controlled to flash at a certain frequency. The embodiments of the present application do not limit this.

[0125] It is worth mentioning that when the cumulative number of charging abnormalities exceeds the preset number, a safety alarm is given, so that the information of the charging abnormality can be timely conveyed to avoid causing great loss. Moreover, the BMS only gives a safety alarm when the cumulative number of charging abnormalities exceeds the preset number, so that false alarms can be avoided in the case of misjudgment of the battery charging abnormality due to fluctuations in the sampling voltage.

[0126] In the embodiments of the present application, the first minimum voltage in the n sampling voltages corresponds to the first sampling time according to the continuous n sampling voltages of the first battery cell between the end time of the i-th charging phase and the end time of the i+1-th charging phase in the k-th charging. The second minimum voltage in the n sampling voltages corresponds to the second sampling time in the same way. Then, the k-th charging abnormality is determined according to the first minimum voltage and the second minimum voltage, or the k-th charging abnormality is determined according to the change rate of the sampling voltage in the first time period after the first sampling time in the k-th charging process and the change rate of the sampling voltage in the second time period after the second sampling time in the k-1-th charging process. In the present application, the charging current of the i-th charging phase is greater than the charging current of the i+1-th charging phase, and the k-th charging abnormality is determined according to the change of the sampling voltage and / or the change of the change rate of the sampling voltage in the process of switching from large current charging to small current charging of the battery. The accuracy of detecting the charging abnormality is higher, and the misjudgment rate can be effectively reduced.

[0127] Figure 3 FIG. 1 is a structural schematic diagram of a charging abnormality detection device provided by an embodiment of the present application, as shown in the figure, the charging abnormality detection device comprises a processing module 301 and a charging module 302. Figure 3

[0128] The processing module 301 is configured to, in the k-th charging of the battery, acquire continuous n sampling voltages of a first battery cell between the end time of the i-th charging phase and the end time of the i+1-th charging phase, the first battery cell being any one of the battery cells, the charging current of the i-th charging phase being greater than the charging current of the i+1-th charging phase, i being greater than or equal to 1, k being greater than or equal to 2, and n being greater than 2.

[0129] The processing module 301 is further configured to determine the first minimum voltage in the n sampling voltages corresponding to the first sampling time according to the continuous n sampling voltages.

[0130] The processing module 301 is further configured to determine the k-th charging abnormality according to the first minimum voltage and the second minimum voltage, and / or according to the change rate of the sampling voltage in the first time period in the k-th charging process and the change rate of the sampling voltage in the second time period in the L-th charging process.

[0131] ​The second minimum voltage is a minimum voltage of the first battery cell between an end time of the i-th charging stage and an end time of an i+1-th charging stage in the L-th charging process, and a sampling time of the second minimum voltage is the second sampling time. The L-th charging process is any one of the previous k-1 charging processes. The first time period is a time period after the first sampling time, and the second time period is a time period after the second sampling time. A time length of the first time period is equal to a time length of the second time period.

[0132] Optionally, the continuous n sampling voltages include an m-th sampling voltage at an m-th sampling time and an m+n-1-th sampling voltage at an m+n-1-th sampling time. The processing module 301 is further configured to: determine the m-th sampling voltage at the m-th sampling time as the minimum voltage; if a sampling voltage at an m+j-th sampling time is less than a sampling voltage at an m+j-1-th sampling time, update the minimum voltage with the sampling voltage at the m+j-th sampling time; and if the sampling voltage at the m+j-th sampling time is less than or equal to sampling voltages at an m+j+1-th sampling time to an m+n-1-th sampling time, determine the m+j-th sampling time as the first sampling time corresponding to the first minimum voltage, where j is greater than or equal to 1 and less than or equal to n-2, and m is greater than or equal to 1.

[0133] Optionally, the processing module 301 is further configured to: if the first minimum voltage is greater than the second minimum voltage, determine that the k-th charging is abnormal.

[0134] Optionally, the processing module 301 is further configured to: if a change rate of the sampling voltage in the first time period in the k-th charging process is less than a change rate of the sampling voltage in the second time period in the L-th charging process, determine that the k-th charging is abnormal.

[0135] Optionally, the processing module 301 is further configured to: update a number of times of the battery charging abnormality to obtain an accumulated number of times of the charging abnormality.

[0136] The charging abnormality detection apparatus further includes a charging module 302 configured to stop charging the battery when the accumulated number of times of the charging abnormality exceeds a preset number of times.

[0137] Optionally, a charging current of the i-th charging stage is a first current, and a charging current of the i+1-th charging stage is a second current. The first current is greater than the second current. The processing module 301 is further configured to:

[0138] If a current difference between the first current and the second current is greater than a current threshold, directly switch the first current to the second current, and acquire n sampling voltages at the m-th sampling time to the m+n-1-th sampling time after the first current is switched to the second current.

[0139] If the current difference is less than or equal to the current threshold, the first current is switched to the third current first, and then the third current is switched to the second current, and n sampling voltages are obtained at the mth sampling moment to the m+n-1th sampling moment after the third current is switched to the second current, and the third current is greater than the first current.

[0140] In the embodiments of the present application, the first minimum voltage corresponding to the first sampling moment in the n sampling voltages is determined according to the continuous n sampling voltages of the first battery cell between the end moment of the i-th charging stage and the end moment of the i+1-th charging stage in the k-th charging. The second minimum voltage corresponding to the second sampling moment in the charging process of any one of the previous k-1 times can be determined based on the same manner as described above. Then, the k-th charging abnormality is determined according to the first minimum voltage and the second minimum voltage, or the k-th charging abnormality is determined according to the change rate of the sampling voltage in the first time period after the first sampling moment in the k-th charging process and the change rate of the sampling voltage in the second time period after the second sampling moment in the charging process of any one of the previous k-1 times. In the present application, the charging current of the i-th charging stage is greater than the charging current of the i+1-th charging stage. The k-th charging abnormality is determined according to the change of the sampling voltage and / or the change of the change rate of the sampling voltage in the process of switching the battery from large current charging to small current charging. The accuracy of detecting the charging abnormality is higher, and the misjudgment rate can be effectively reduced.

[0141] As to the apparatus in the above embodiments, the specific manners in which various modules perform operations have been described in detail in the embodiments of the method, and thus will not be described in detail here.

[0142] It should be understood that the division of units in the above apparatus is only a logical division of functions, and all or part of the units can be integrated into one physical entity, or can be physically separated. The units in the apparatus can all be implemented in the form of software called by a processing element, or all be implemented in the form of hardware, or part of the units can be implemented in the form of software called by a processing element, and part of the units can be implemented in the form of hardware. For example, each unit can be a separately established processing element, or can be integrated in a chip of the apparatus, and in addition, the units can be stored in the form of a program in a memory and called and executed by a processing element of the apparatus. In addition, all or part of the units can be integrated together or independently implemented. The processing element herein can be an integrated circuit having a signal processing capability. In the implementation process, each step of the above method or each unit can be implemented by an integrated logic circuit of hardware in the processing element, or in the form of software called by the processing element.

[0143] The embodiments of the present application also provide a battery comprising the above Figure 3 The detection apparatus for charging abnormality provided in the embodiments shown.

[0144] The embodiment of the present application also provides a charging device for charging a battery. The charging device includes the above Figure 3 The illustrated embodiment provides a device for detecting abnormal charging.

[0145] The present application also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the above Figures 1 to 2 The illustrated embodiment provides a method for detecting charging anomalies.

[0146] Computer-readable storage media may include electronic circuits, semiconductor memory devices, read-only memory (ROM), flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc., without limitation.

[0147] Figure 4 This is a structural diagram of another charging abnormality detection device provided in an embodiment of the present application. Figure 4 The device for detecting anomaly charging includes: a processor 410, a memory 420, and an interface 430. The processor 410, the memory 420, and the interface 430 are connected via a bus 440, which can be implemented by a connecting circuit. The memory 420 is used to store a program, which, when called by the processor 410, can implement the method executed by the device for detecting anomaly charging in the above embodiment. The interface 430 is used to communicate with other devices for detecting anomaly charging, and the interface 430 can communicate with other devices for detecting anomaly charging via a wired connection or a wireless connection.

[0148] The functions of the units of the above charging abnormality detection apparatus can be implemented by the processor 410 invoking the program stored in the memory 420. That is, the above charging abnormality detection apparatus includes the processor 410 and the memory 420, and the memory 420 is configured to store a program, which is invoked by the processor 410 to execute the method in the above method embodiments. The processor 410 herein can be a general processor, and can also be other processors that can invoke programs; or the processor 410 can be configured as one or more integrated circuits that implement the method executed by the charging abnormality detection apparatus in the above embodiments, such as one or more application specific integrated circuits (ASICs), or one or more digital signal processors (DSPs), or one or more field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. For another example, when the units in the charging abnormality detection apparatus can be implemented in the form of processor scheduling programs, the processor 410 can be a general processor, such as a central processing unit (CPU), a controller, a microcontroller, a single-chip computer or other processors that can invoke programs. For another example, the units can be integrated together to implement in the form of a system on a chip.

[0149] The number of memories 420 is not limited, and can be one or more.

[0150] The memory 420 includes at least one type of readable storage medium, including nonvolatile memory or volatile memory, for example, a flash memory, a hard disk, a multimedia card micro type memory, a card type memory (e.g., SD or DX memory, etc.), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM), a magnetic memory, a magnetic disk, or an optical disk, etc. The RAM can include a static RAM or a dynamic RAM. In some embodiments, the memory 420 can be an internal memory of the device, for example, a hard disk or a memory of the device. In other embodiments, the memory 420 can also be an external storage device of the device, for example, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, or a flash card, etc. installed on the device. Of course, the memory 420 can include both the internal memory and the external storage device of the device. In the present embodiment, the memory 420 is generally used to store an operating system and various application software installed on the device, for example, program codes of the charging anomaly detection method, etc. In addition, the memory 420 can also be used to temporarily store various data that have been output or will be output.

[0151] The bus 440 can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, etc. The bus 440 can include an address bus, a data bus, or a control bus, etc. For ease of representation, only one thick line is shown in the figure, but it does not mean that there is only one bus or only one type of bus.

[0152] The processor 410 is generally used to control the overall operation of the device. In this embodiment, the memory 420 is used to store program codes or instructions, the program codes including computer operation instructions, and the processor 410 is used to execute the program codes or instructions stored in the memory 420 or process data, for example, program codes of the charging abnormality detection method.

[0153] In summary, according to the continuous n sampling voltages of the first electric core between the end time of the i charging stage in the k charging and the end time of the i+1 charging stage, the first minimum voltage in the n sampling voltages is determined to correspond to the first sampling time. The second minimum voltage in the k-1 charging process can be determined in the same way. Then, according to the first minimum voltage and the second minimum voltage, the k charging abnormality is determined, or according to the change rate of the sampling voltage in the first time period after the first sampling time in the k charging process and the change rate of the sampling voltage in the second time period after the second sampling time in the k-1 charging process, the k charging abnormality is determined. In this application, the charging current of the i charging stage is greater than the charging current of the i+1 charging stage. According to the change of the sampling voltage in the process of switching from large current charging to small current charging of the battery and / or the change of the change rate of the sampling voltage, the k charging abnormality is determined. The accuracy of detecting charging abnormality is higher, and the misjudgment rate can be effectively reduced.

[0154] Those skilled in the art will appreciate that a combination of features of different embodiments means within the scope of the application and forms different embodiments, although some embodiments herein include certain features rather than other features included in other embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0155] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for detecting abnormal charging, characterized in that: The method comprises: During a kth charging of the battery, obtaining n consecutive sampled voltages of a first cell from an end time of an i-th charging stage to an end time of an (i+1)-th charging stage, where the first cell is any cell in the battery, a charging current of the i-th charging stage is greater than a charging current of the (i+1)-th charging stage, i is greater than or equal to 1, k is greater than or equal to 2, and n is greater than 2; Determining, based on the n consecutive sampled voltages, a first sampling moment corresponding to a first minimum voltage among the n sampled voltages; the first minimum voltage being the minimum sampled voltage among the n sampled voltages; determining that the kth charging is abnormal according to the first minimum voltage and the second minimum voltage, and / or according to the rate of change of the sampled voltage in the first time period during the kth charging process and the rate of change of the sampled voltage in the second time period during the Lth charging process; The second minimum voltage is the minimum voltage of the first battery cell between the end of the i-th charging stage and the end of the (i+1)-th charging stage during the L-th charging process. The sampling time of the second minimum voltage is the second sampling time. The L-th charging process is any charging process among the previous k-1 charging processes. The first time period is the time period after the first sampling time, and the second time period is the time period after the second sampling time. The duration of the first time period is equal to the duration of the second time period. The determining the kth charging abnormality according to the first minimum voltage and the second minimum voltage includes: If the first minimum voltage is greater than the second minimum voltage, determining that the kth charging is abnormal; The determining the kth charging abnormality according to the change rate of the sampled voltage in the first time period during the kth charging process and the change rate of the sampled voltage in the second time period during the Lth charging process includes: If the rate of change of the sampled voltage in the first time period during the k-th charging process is less than the rate of change of the sampled voltage in the second time period during the L-th charging process, it is determined that the k-th charging is abnormal; The charging current of the i-th charging stage is a first current, the charging current of the i+1-th charging stage is a second current, the first current is greater than the second current, and the acquiring n consecutive sampled voltages of the first battery cell from the end time of the i-th charging stage to the end time of the i+1-th charging stage includes: If the current difference between the first current and the second current is greater than a current threshold, directly switching the first current to the second current, and acquiring the n sampled voltages from the mth sampling time to the m+n-1th sampling time after the first current is switched to the second current; If the current difference is less than or equal to the current threshold, the first current is first switched to the third current, and then the third current is switched to the second current, and the n sampling voltages are obtained from the mth sampling time to the (m+n-1)th sampling time after the third current is switched to the second current, and the third current is greater than the first current.

2. The method according to claim 1, characterized in that The n consecutive sampled voltages include the mth sampled voltage at the mth sampling moment to the m+n-1th sampled voltage at the m+n-1th sampling moment, and determining, based on the n consecutive sampled voltages, a first sampling moment corresponding to a first minimum voltage among the n sampled voltages includes: determining the mth sampling voltage at the mth sampling moment as the minimum voltage; If the sampling voltage at the m+jth sampling moment is less than the sampling voltage at the m+j-1th sampling moment, the minimum voltage is updated with the sampling voltage at the m+jth sampling moment; If the sampling voltage at the m+jth sampling time is less than or equal to the sampling voltages from the m+j+1th time to the m+n-1th sampling time, the m+jth sampling time is determined as the first sampling time corresponding to the first minimum voltage, the jth is greater than or equal to 1 and less than or equal to n-2, and the m is greater than or equal to 1.

3. The method according to any one of claims 1 to 2, characterized in that: The method further comprises: Updating the number of battery charging anomalies to obtain a cumulative number of charging anomalies; When the accumulated number of charging abnormalities exceeds a preset number, charging of the battery is stopped.

4. A device for detecting abnormal charging, characterized in that: The device comprises: a processing module, configured to obtain, during a kth charging of the battery, n consecutive sampled voltages of a first battery cell between an end time of an i-th charging stage and an end time of an (i+1)th charging stage, where the first battery cell is any battery cell in the battery, a charging current in the i-th charging stage is greater than a charging current in the (i+1)th charging stage, i is greater than or equal to 1, k is greater than or equal to 2, and n is greater than 2; The processing module is further configured to determine, based on the n consecutive sampled voltages, a first sampling moment corresponding to a first minimum voltage among the n sampled voltages; the first minimum voltage being the minimum sampled voltage among the n sampled voltages; The processing module is further configured to determine that the kth charging is abnormal based on the first minimum voltage and the second minimum voltage, and / or based on a rate of change of the sampled voltage in a first time period during the kth charging process and a rate of change of the sampled voltage in a second time period during the Lth charging process; The second minimum voltage is the minimum voltage of the first battery cell between the end of the i-th charging stage and the end of the (i+1)-th charging stage during the L-th charging process. The sampling time of the second minimum voltage is the second sampling time. The L-th charging process is any charging process among the previous k-1 charging processes. The first time period is the time period after the first sampling time, and the second time period is the time period after the second sampling time. The duration of the first time period is equal to the duration of the second time period. The processing module is specifically used for: If the first minimum voltage is greater than the second minimum voltage, it is determined that the kth charging is abnormal; and / or if the rate of change of the sampled voltage in the first time period during the kth charging process is less than the rate of change of the sampled voltage in the second time period during the Lth charging process, it is determined that the kth charging is abnormal; The charging current of the i-th charging stage is a first current, the charging current of the (i+1)-th charging stage is a second current, the first current is greater than the second current, and the processing module is specifically configured to: If the current difference between the first current and the second current is greater than a current threshold, directly switching the first current to the second current, and acquiring the n sampled voltages from the mth sampling time to the m+n-1th sampling time after the first current is switched to the second current; If the current difference is less than or equal to the current threshold, the first current is first switched to the third current, and then the third current is switched to the second current, and the n sampling voltages are obtained from the mth sampling time to the (m+n-1)th sampling time after the third current is switched to the second current, and the third current is greater than the first current.

5. A battery, characterized in that: The device comprises the charging abnormality detection device according to claim 4.

6. A charging device for charging a battery, characterized in that: The charging device includes the charging abnormality detection device according to claim 4.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for detecting a charging abnormality according to any one of claims 1 to 3 is implemented.

8. An electronic device, characterized in that: include: processor; as well as a memory for storing executable instructions of the processor; The processor is configured to execute the method for detecting charging abnormality according to any one of claims 1 to 3 by executing the executable instructions.

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