Early warning method and device for battery capacity diving and electronic equipment

Abstract

The invention provides an early warning method and device for battery capacity diving and electronic equipment. The method comprises the following steps: determining a relation curve of charging end voltage-cycle number of a target battery; the charging end voltage is the charging end voltage in the charging step which does not take the voltage as the cut-off condition; determining a curve slope on each loop number value in the relation curve; according to the slope of each curve, carrying out capacity diving early warning control processing on the target battery; therefore, judgment processing can be carried out in the early stage of the capacity diving phenomenon, timeliness is high, early intervention processing can be conveniently carried out on the capacity diving phenomenon, and the use safety of the battery is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to a method and device for warning of battery capacity drop and an electronic device. Background Art

[0002] Currently, during the use of secondary batteries, it is mainly based on the capacity retention data of secondary batteries in multiple charge-discharge cycles to determine whether there is a phenomenon of battery capacity drop. In the above solution, it is necessary to make a judgment after the charge-discharge cycle in which the capacity drop phenomenon occurs, and the timeliness is poor. Summary of the Invention

[0003] The present invention aims to solve the technical problems in the related art to a certain extent.

[0004] To this end, the first object of the present invention is to propose a method for warning of battery capacity drop, including: determining the relationship curve between the charging end voltage and the number of cycles of the target battery; the charging end voltage is the charging end voltage in the charging step that is not based on the voltage as the cut-off condition; determining the curve slope at each numerical value of the number of cycles in the relationship curve; and performing warning control processing on the target battery according to each curve slope; thereby enabling early judgment and processing of the capacity drop phenomenon, with strong timeliness, facilitating early intervention in the capacity drop phenomenon, and improving the use safety of the battery.

[0005] The second object of the present invention is to propose a device for warning of battery capacity drop.

[0006] The third object of the present invention is to propose an electronic device.

[0007] The fourth object of the present invention is to propose a non-transitory computer-readable storage medium.

[0008] The fifth object of the present invention is to propose a computer program product.

[0009] To achieve the above object, the first aspect embodiment of the present invention proposes a method for warning of battery capacity drop, including: determining the relationship curve between the charging end voltage and the number of cycles of the target battery; the charging end voltage is the charging end voltage in the charging step that is not based on the voltage as the cut-off condition; determining the curve slope at each numerical value of the number of cycles in the relationship curve; and performing warning control processing on the target battery according to each curve slope.

[0010] The early warning method for battery capacity diving in the embodiments of the present invention determines the relationship curve between the end-of-charge voltage and the number of cycles of the target battery; the end-of-charge voltage is the end-of-charge voltage in the charging step that does not use voltage as the cut-off condition; determines the curve slope at each value of the number of cycles in the relationship curve; performs early warning control processing on the target battery according to each curve slope; thus, it can judge and process in the early stage of the capacity diving phenomenon, with strong timeliness, facilitating early intervention in the capacity diving phenomenon and improving the use safety of the battery.

[0011] In addition, the early warning method for battery capacity diving proposed in the first aspect embodiments of the present invention may further have the following additional technical features:

[0012] According to an embodiment of the present invention, the determining the relationship curve between the end-of-charge voltage and the number of cycles of the target battery includes: in the charging step of the target battery that does not use voltage as the cut-off condition, obtaining the end-of-charge voltage value and the end-of-charge time point of the target battery; determining the number of cycles value of the target battery at the end-of-charge time point; constructing a relationship curve according to the end-of-charge voltage value and the number of cycles value at each end-of-charge time point.

[0013] According to an embodiment of the present invention, the constructing a relationship curve according to the end-of-charge voltage value and the number of cycles value at each end-of-charge time point includes: performing curve fitting processing according to the end-of-charge voltage value and the number of cycles value at each end-of-charge time point to obtain the relationship curve.

[0014] According to an embodiment of the present invention, the charging step that does not use voltage as the cut-off condition includes a charging step that uses charging time as the cut-off condition.

[0015] According to an embodiment of the present invention, the performing early warning control processing on the target battery according to each curve slope includes: determining whether there is a first curve slope among each curve slope; the first curve slope satisfies the early warning condition for capacity diving; in the case where the first curve slope exists among each curve slope, performing early warning processing on the target battery; in the case where the first curve slope does not exist among each curve slope, stopping the early warning processing on the target battery.

[0016] According to an embodiment of the present invention, the performing early warning processing on the target battery includes: determining the first end-of-charge voltage corresponding to the first curve slope; determining the first end-of-charge time point corresponding to the first end-of-charge voltage; performing early warning processing on the target battery according to the first end-of-charge time point and the first curve slope.

[0017] According to an embodiment of the present invention, the capacity diving warning condition includes at least one of the following: the curve slope is greater than or equal to the curve slope threshold; the ratio of the curve slope to the stable state curve slope of the target battery is greater than or equal to the ratio threshold; the curve slope threshold and the ratio threshold are determined according to the test relationship curve of the charging end voltage - cycle number of the test battery of the same type as the target battery; the test battery is a battery that has experienced capacity diving.

[0018] According to an embodiment of the present invention, the method further includes: obtaining the new charging end voltage value of the target battery and the new cycle number corresponding to the new charging end voltage value; updating the relationship curve according to the new charging end voltage value and the new cycle number; and re - performing the capacity diving warning control process on the target battery according to the updated relationship curve.

[0019] According to an embodiment of the present invention, the method further includes: when performing the capacity diving warning process on the target battery, determining the current value and the number of cycles of the small - current charge - discharge step; and performing small - current charge - discharge processing on the target battery using the small - current charge - discharge step according to the current value and the number of cycles.

[0020] To achieve the above object, an embodiment of the second aspect of the present invention provides a warning device for battery capacity diving, including: a first determination module, configured to determine the relationship curve of the charging end voltage - cycle number of the target battery; the charging end voltage is the charging end voltage in the charging step that does not take voltage as the cut - off condition; a second determination module, configured to determine the curve slope at each cycle number value of the relationship curve; and a control processing module, configured to perform capacity diving warning control processing on the target battery according to each of the curve slopes.

[0021] The warning device for battery capacity diving in the embodiment of the present invention determines the relationship curve of the charging end voltage - cycle number of the target battery; the charging end voltage is the charging end voltage in the charging step that does not take voltage as the cut - off condition; determines the curve slope at each cycle number value of the relationship curve; and performs capacity diving warning control processing on the target battery according to each curve slope, so as to be able to make a judgment and processing in the early stage of the capacity diving phenomenon, with strong timeliness, which is convenient for early intervention in the capacity diving phenomenon and improves the use safety of the battery.

[0022] In addition, the warning device for battery capacity diving proposed in the embodiment of the second aspect of the present invention may further have the following additional technical features:

[0023] According to an embodiment of the present invention, the first determination module includes an acquisition unit, a first determination unit, and a construction unit; the acquisition unit is configured to acquire the charging end voltage value and the charging end time point of the target battery in a charging step of the target battery that does not use voltage as a cut-off condition; the first determination unit is configured to determine the number of cycle values of the target battery at the charging end time point; the construction unit is configured to construct a relationship curve according to the charging end voltage values and the number of cycle values at each charging end time point.

[0024] According to an embodiment of the present invention, the construction unit is specifically configured to perform curve fitting processing according to the charging end voltage values and the number of cycle values at each charging end time point to obtain the relationship curve.

[0025] According to an embodiment of the present invention, the charging step that does not use voltage as a cut-off condition includes a charging step that uses charging time as a cut-off condition.

[0026] According to an embodiment of the present invention, the control processing module includes: a second determination unit and a processing unit; the second determination unit is configured to determine whether there is a first curve slope among the respective curve slopes; the first curve slope satisfies the capacity dive warning condition; the processing unit is configured to perform a capacity dive warning process on the target battery when there is the first curve slope among the respective curve slopes; the processing unit is further configured to stop performing the capacity dive warning process on the target battery when there is no first curve slope among the respective curve slopes.

[0027] According to an embodiment of the present invention, the processing unit is specifically configured to determine the first charging end voltage corresponding to the first curve slope; determine the first charging end time point corresponding to the first charging end voltage; and perform a capacity dive warning process on the target battery according to the first charging end time point and the first curve slope.

[0028] According to an embodiment of the present invention, the capacity dive warning condition includes at least one of the following: the curve slope is greater than or equal to a curve slope threshold; the ratio of the curve slope to the steady-state curve slope of the target battery is greater than or equal to a ratio threshold; the curve slope threshold and the ratio threshold are determined according to a test relationship curve of the charging end voltage - number of cycles of a test battery of the same type as the target battery; the test battery is a battery that has experienced a capacity dive phenomenon.

[0029] According to an embodiment of the present invention, the device further includes: an acquisition module and an update processing module; the acquisition module is configured to acquire the newly added charging end voltage value of the target battery and the newly added number of cycles corresponding to the newly added charging end voltage value; the update processing module is configured to perform update processing on the relationship curve according to the newly added charging end voltage value and the newly added number of cycles; the control processing module is further configured to perform capacity dive warning control processing on the target battery again according to the updated relationship curve.

[0030] According to an embodiment of the present invention, the device further includes: a third determination module and a charge and discharge processing module; the third determination module is configured to determine the current value and the number of cycles of the small current charge and discharge step when performing capacity dive warning processing on the target battery; the charge and discharge processing module is configured to perform small current charge and discharge processing on the target battery using the small current charge and discharge step according to the current value and the number of cycles.

[0031] To achieve the above object, an embodiment of the third aspect of the present invention provides an electronic device, including: a processor; a memory for storing executable instructions of the processor; wherein, the processor is configured to: implement the warning method for battery capacity dive as described in the embodiment of the first aspect.

[0032] To achieve the above object, an embodiment of the fourth aspect of the present invention provides a non-transitory computer-readable storage medium, when the instructions in the storage medium are executed by a processor, enabling the processor to execute the warning method for battery capacity dive as described in the embodiment of the first aspect.

[0033] To achieve the above object, an embodiment of the fifth aspect of the present invention provides a computer program product, including a computer program, and the computer program implements the warning method for battery capacity dive according to the embodiment of the first aspect when executed by a processor.

[0034] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0035] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the following description of the embodiments in conjunction with the drawings, where:

[0036] Figure 1 is a schematic flow chart of the warning method for battery capacity dive according to an embodiment of the present invention;

[0037] Figure 2 is a schematic flow chart of the warning method for battery capacity dive according to an embodiment of the present invention;

[0038] Figure 3 It is a schematic flowchart of a method for warning of battery capacity dive according to an embodiment of the present invention;

[0039] Figure 4 It is a schematic diagram of the relationship curve between the end-of-charge voltage and the number of cycles of 3 batteries;

[0040] Figure 5 It is a schematic structural diagram of a warning device for battery capacity dive according to an embodiment of the present invention;

[0041] Figure 6 It is a schematic block diagram of an electronic device. Detailed implementation manners

[0042] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0043] The method, device and electronic device for warning of battery capacity dive according to an embodiment of the present invention will be described below with reference to the drawings.

[0044] Figure 1 It is a schematic flowchart of a method for warning of battery capacity dive according to an embodiment of the present invention. As Figure 1 shown, the method for warning of battery capacity dive according to an embodiment of the present invention includes the following steps:

[0045] Step 101, determining the relationship curve between the end-of-charge voltage and the number of cycles of the target battery; the end-of-charge voltage is the end-of-charge voltage in a charging step that does not use voltage as the cut-off condition.

[0046] In the embodiment of the present invention, the charging step that does not use voltage as the cut-off condition includes a charging step that uses charging time as the cut-off condition. In addition, the charging step that does not use voltage as the cut-off condition may further include at least one of the following: a charging step that uses charging current as the cut-off condition; a charging step that uses charging temperature as the cut-off condition; a charging step that uses at least two of charging time, charging current and charging temperature as the cut-off condition, etc. Specific limitations are not made here, and it can be set according to actual needs.

[0047] In the embodiments of the present invention, the number of cycles refers to the number of times the battery undergoes a complete charge-discharge process. Generally, a complete charge-discharge process can refer to the battery discharging from a fully charged state (100% battery power) to a certain low battery level (such as 0% or lower), and then being charged back to the fully charged state. In practical applications, the number of cycles can be determined by cumulatively calculating all the cycles (complete cycles and partial cycles) during the battery application process.

[0048] Step 102: Determine the curve slope at each cycle number value in the relationship curve.

[0049] In the embodiments of the present invention, the curve slope at each cycle number value in the relationship curve can be determined by combining the following formula (1).

[0050] k = (Um - Un) / (m - n) (1)

[0051] Wherein, k represents the curve slope when the cycle number value is m; Um represents the charging end voltage value when the cycle number value is m; Un represents the charging end voltage value when the cycle number value is n; and m is greater than n.

[0052] Among them, by combining the above formula (1) and the charging end voltage values at each cycle number value, the charging end voltage values at each cycle number value can be determined.

[0053] Step 103: Perform capacity dive warning control processing on the target battery according to each curve slope.

[0054] In the embodiments of the present invention, the process of the warning device for battery capacity dive to execute Step 103 can be, for example, when the curve slope meets the capacity dive warning condition, perform capacity dive warning processing on the target battery.

[0055] In the embodiments of the present invention, in order to extend the cycle life of the target battery, after performing capacity dive warning processing on the target battery, the warning device for battery capacity dive can perform small current charge-discharge step processing on the target battery to relieve or suppress the capacity dive phenomenon. Correspondingly, after Step 103, the warning device for battery capacity dive can also execute the following process: when performing capacity dive warning processing on the target battery, determine the current value and the number of cycles of the small current charge-discharge step; according to the current value and the number of cycles, perform small current charge-discharge processing on the target battery using the small current charge-discharge step.

[0056] Among them, the early warning device for the battery capacity plunge can determine the rising amplitude and rising rate of the charging end voltage; the rising rate here refers to the curve slope; the current value and the number of cycles of the small current charge and discharge process step are determined in combination with the rising amplitude and / or the rising rate. Among them, the current value can be, for example, one of the values in 0.01C - 0.3C.

[0057] In summary, the early warning method for the battery capacity plunge in the embodiments of the present invention determines the relationship curve of the charging end voltage - number of cycles of the target battery; the charging end voltage is the charging end voltage in the charging process step that does not use voltage as the cut-off condition; the curve slope at each number of cycles value in the relationship curve is determined; according to each curve slope, early warning control processing is performed on the target battery for the capacity plunge; thus, it can be judged and processed in the early stage of the capacity plunge phenomenon, with strong timeliness, facilitating early intervention in the capacity plunge phenomenon and improving the use safety of the battery.

[0058] Figure 2 It is a schematic flow chart of the early warning method for the battery capacity plunge according to the embodiments of the present invention. As Figure 2 shown, the early warning method for the battery capacity plunge in the embodiments of the present invention includes the following steps:

[0059] Step 201, in the charging process step of the target battery that does not use voltage as the cut-off condition, obtain the charging end voltage value and the charging end time point of the target battery.

[0060] In the embodiments of the present invention, during the use of the target battery, there are multiple charging process steps. To facilitate early warning processing of the capacity plunge of the target battery, the charging process step that does not use voltage as the cut-off condition can be used to charge the target battery. Correspondingly, the charging end voltage value and the charging end time point of the target battery in multiple charging process steps that do not use voltage as the cut-off condition can be obtained.

[0061] In the embodiments of the present invention, the target battery is, for example, a battery such as a lithium-ion battery or a graphite battery that may exhibit a capacity plunge phenomenon.

[0062] Step 202, determine the number of cycles value of the target battery at the charging end time point.

[0063] Step 203, construct a relationship curve according to the charging end voltage value and the number of cycles value at each charging end time point.

[0064] In the embodiments of the present invention, the process for the early warning device for the battery capacity plunge to execute step 203 can be, for example, performing curve fitting processing according to the charging end voltage value and the number of cycles value at each charging end time point to obtain the relationship curve. Among them, the abscissa of the relationship curve is the number of cycles, and the ordinate is the charging end voltage.

[0065] Step 204: Determine the curve slope at each number of cycles in the relationship curve.

[0066] Step 205: Perform capacity plunge warning control processing on the target battery according to each curve slope.

[0067] In the embodiment of the present invention, the relationship curve of the end-of-charge voltage - number of cycles can be the relationship area of the target battery at each time point. That is to say, every time a set of end-of-charge voltage values and number of cycle values are collected, the relationship curve can be updated to ensure the accuracy and timeliness of the relationship curve, and further ensure the timeliness of the battery capacity plunge warning. Correspondingly, after step 201, the warning device for battery capacity plunge can also perform the following process: obtain the new end-of-charge voltage value of the target battery and the new number of cycles corresponding to the new end-of-charge voltage value; update the relationship curve according to the new end-of-charge voltage value and the new number of cycles; perform capacity plunge warning control processing on the target battery again according to the updated relationship curve.

[0068] In summary, the warning method for battery capacity plunge in the embodiment of the present invention obtains the end-of-charge voltage value and the end-of-charge time point of the target battery in the charging step that does not use voltage as the cut-off condition; determines the number of cycle values of the target battery at the end-of-charge time point; constructs a relationship curve according to the end-of-charge voltage values and the number of cycle values at each end-of-charge time point; determines the curve slope at each number of cycles in the relationship curve; performs capacity plunge warning control processing on the target battery according to each curve slope; thereby being able to construct a relationship curve based on the end-of-charge voltage values and the number of cycle values at each end-of-charge time point, and then making a judgment in the early stage of the capacity plunge phenomenon, with strong timeliness, facilitating early intervention in the capacity plunge phenomenon, and improving the use safety of the battery.

[0069] Figure 3 is a schematic flowchart of the warning method for battery capacity plunge according to the embodiment of the present invention. As Figure 3 shown, the warning method for battery capacity plunge in the embodiment of the present invention includes the following steps:

[0070] Step 301: Determine the relationship curve of the end-of-charge voltage - number of cycles of the target battery; the end-of-charge voltage is the end-of-charge voltage in the charging step that does not use voltage as the cut-off condition.

[0071] Step 302: Determine the curve slope at each number of cycles in the relationship curve.

[0072] Step 303: Determine whether there is a first curve slope among the slopes of each curve; the first curve slope meets the capacity dive warning condition.

[0073] In an embodiment of the present invention, the capacity dive warning condition may include at least one of the following: the curve slope is greater than or equal to a curve slope threshold; the ratio of the curve slope to the steady-state curve slope of the target battery is greater than or equal to a ratio threshold. The curve slope threshold and the ratio threshold are determined according to the test relationship curve of the end-of-charge voltage - number of cycles of the test battery of the same type as the target battery; the test battery is a battery that exhibits a capacity dive phenomenon.

[0074] In one example, the capacity dive warning condition may include that the curve slope is greater than or equal to the curve slope threshold. Correspondingly, the process of the warning device for battery capacity dive to execute step 303 may be, for example, for each curve slope in turn, determine whether the curve slope is greater than or equal to the curve slope threshold; if the curve slope is greater than or equal to the curve slope threshold, determine the curve slope as the first curve slope and determine that there is a first curve slope among the slopes of each curve; if all curve slopes are less than the curve slope threshold, determine that there is no first curve slope among the slopes of each curve.

[0075] In another example, the capacity dive warning condition may include that the ratio of the curve slope to the steady-state curve slope of the target battery is greater than or equal to the ratio threshold. Correspondingly, the process of the warning device for battery capacity dive to execute step 303 may be, for example, determine the steady-state curve slope of the target battery in the steady state; for each curve slope in turn, determine the ratio between the curve slope and the steady-state curve slope; if the ratio between the curve slope and the steady-state curve slope is greater than or equal to the ratio threshold, determine the curve slope as the first curve slope and determine that there is a first curve slope among the slopes of each curve; if the ratio between each curve slope and the steady-state curve slope is less than the ratio threshold, determine that there is no first curve slope among the slopes of each curve.

[0076] In another example, the capacity dive warning condition may include that the curve slope is greater than or equal to the curve slope threshold; the ratio of the curve slope to the steady-state curve slope of the target battery is greater than or equal to the ratio threshold. For each curve slope in turn, when the curve slope meets at least one of the above two conditions, determine the curve slope as the first curve slope and determine that there is a first curve slope among the slopes of each curve; when none of the curve slopes meet any of the above two conditions, that is, all curve slopes are less than the curve slope threshold and the ratio of all curve slopes to the steady-state curve slope is less than the ratio threshold, determine that there is no first curve slope among the slopes of each curve.

[0077] Step 304, when there is a first curve slope among the various curve slopes, perform a capacity dive warning process on the target battery.

[0078] In the embodiment of the present invention, the process of the warning device for battery capacity dive to perform a capacity dive warning process on the target battery can be, for example, determining a first charging end voltage corresponding to the first curve slope; determining a first charging end time point corresponding to the first charging end voltage; and performing a capacity dive warning process on the target battery according to the first charging end time point and the first curve slope.

[0079] Step 305, when there is no first curve slope among the various curve slopes, stop performing a capacity dive warning process on the target battery.

[0080] In summary, for the warning method of battery capacity dive in the embodiment of the present invention, by determining the relationship curve of the charging end voltage - number of cycles of the target battery; the charging end voltage is the charging end voltage in the charging step that is not based on the voltage as the cut-off condition; determining the curve slopes at the numerical values of the number of cycles in the relationship curve; determining whether there is a first curve slope among the various curve slopes; the first curve slope satisfies the capacity dive warning condition; when there is a first curve slope among the various curve slopes, performing a capacity dive warning process on the target battery; when there is no first curve slope among the various curve slopes, stopping performing a capacity dive warning process on the target battery; wherein, determining whether there is a first curve slope that satisfies the capacity dive warning condition among the various curve slopes, and further determining whether a capacity dive warning phenomenon may occur in the target battery later, can make a judgment and processing in the early stage of the capacity dive phenomenon, with strong timeliness, facilitating early intervention and processing of the capacity dive phenomenon, and improving the use safety of the battery.

[0081] The following is an example for illustration. Assume there are Battery 1, Battery 2, and Battery 3, and they are used in the 45°C high-temperature charge and discharge cycle of step charging. The charge and discharge cycle involves an average 4C step charge of 6 charging steps and 1 1C discharge step. Among them, the schematic diagrams of the relationship curves of the charging end voltage - number of cycles of the 3 batteries can be as Figure 4 shown. In Figure 4 , sorting in descending order of the reference charging end voltage at the number of cycles of 600, the relationship curve with the highest reference charging end voltage is the relationship curve of Battery 3 (the points are represented by squares); the relationship curve with the lowest reference charging end voltage is the relationship curve of Battery 2 (the points are represented by circles). The remaining relationship curve is the relationship curve of Battery 1 (the points are represented by triangles).

[0082] In Figure 4Among them, taking the capacity dive warning condition including that the ratio of the curve slope to the steady-state curve slope of the target battery is greater than or equal to the ratio threshold as an example. Assuming the ratio threshold is 2, then in Figure 4 Among them, Battery 1 satisfies the capacity dive warning condition at the curve slope k2. Assuming the ratio threshold is 3, then in Figure 4 Among them, Battery 1 satisfies the capacity dive warning condition at the curve slope k3; Battery 2 satisfies the capacity dive warning condition at the curve slope k5.

[0083] Among them, in Figure 4 Among them, after Battery 1 satisfies the capacity dive warning condition, a small current charge and discharge step is adopted at P1 for small current charge and discharge processing. After Battery 2 satisfies the capacity dive warning condition, a small current charge and discharge step is adopted at P2 for small current charge and discharge processing. Among them, in Figure 4 Among them, T1, T2, and T3 are the curve inflection points of Battery 1. T4 is the curve inflection point of Battery 2.

[0084] Figure 5 is a schematic structural diagram of a warning device for battery capacity dive according to an embodiment of the present invention. As Figure 5 shown, the warning device 50 for battery capacity dive according to an embodiment of the present invention includes: a first determination module 501, a second determination module 502, and a control processing module 503.

[0085] Among them, the first determination module 501 is used to determine the relationship curve of the charging end voltage - number of cycles of the target battery; the charging end voltage is the charging end voltage in the charging step that is not voltage-limited; the second determination module 502 is used to determine the curve slope at each number of cycles value in the relationship curve; the control processing module 503 is used to perform capacity dive warning control processing on the target battery according to each curve slope.

[0086] As a possible implementation manner of an embodiment of the present invention, the first determination module 501 includes an acquisition unit, a first determination unit, and a construction unit; the acquisition unit is used to acquire the charging end voltage value and the charging end time point of the target battery in the charging step that is not voltage-limited for the target battery; the first determination unit is used to determine the number of cycles value of the target battery at the charging end time point; the construction unit is used to construct a relationship curve according to the charging end voltage value and the number of cycles value at each charging end time point.

[0087] As a possible implementation manner of an embodiment of the present invention, the construction unit is specifically used to perform curve fitting processing according to the charging end voltage value and the number of cycles value at each charging end time point to obtain the relationship curve.

[0088] As a possible implementation manner of an embodiment of the present invention, the charging step that does not take voltage as the cut-off condition includes a charging step that takes charging time as the cut-off condition.

[0089] As a possible implementation manner of an embodiment of the present invention, the control processing module 503 includes: a second determination unit and a processing unit; the second determination unit is configured to determine whether there is a first curve slope among the respective curve slopes; the first curve slope satisfies the capacity dive warning condition; the processing unit is configured to perform a capacity dive warning process on the target battery when there is the first curve slope among the respective curve slopes; the processing unit is further configured to stop performing the capacity dive warning process on the target battery when there is no first curve slope among the respective curve slopes.

[0090] As a possible implementation manner of an embodiment of the present invention, the processing unit is specifically configured to determine a first charging end voltage corresponding to the first curve slope; determine a first charging end time point corresponding to the first charging end voltage; and perform a capacity dive warning process on the target battery according to the first charging end time point and the first curve slope.

[0091] As a possible implementation manner of an embodiment of the present invention, the capacity dive warning condition includes at least one of the following: the curve slope is greater than or equal to a curve slope threshold; the ratio of the curve slope to the steady-state curve slope of the target battery is greater than or equal to a ratio threshold; the curve slope threshold and the ratio threshold are determined according to a charging end voltage - cycle number test relationship curve of a test battery of the same type as the target battery; the test battery is a battery that has experienced a capacity dive phenomenon.

[0092] As a possible implementation manner of an embodiment of the present invention, the device further includes: an acquisition module and an update processing module; the acquisition module is configured to acquire a new charging end voltage value of the target battery and a new cycle number corresponding to the new charging end voltage value; the update processing module is configured to perform an update process on the relationship curve according to the new charging end voltage value and the new cycle number; the control processing module is further configured to re-perform a capacity dive warning control process on the target battery according to the updated relationship curve.

[0093] As a possible implementation of the embodiment of the present invention, the device further includes: a third determination module and a charge and discharge processing module; the third determination module is configured to determine the current value and the number of cycles of the small current charge and discharge step when performing the capacity dive warning process on the target battery; the charge and discharge processing module is configured to perform small current charge and discharge processing on the target battery using the small current charge and discharge step according to the current value and the number of cycles.

[0094] In summary, the warning device for battery capacity dive in the embodiment of the present invention determines the relationship curve between the charging end voltage and the number of cycles of the target battery; the charging end voltage is the charging end voltage in the charging step that does not use voltage as the cut-off condition; determines the curve slope at each number of cycles value in the relationship curve; and performs capacity dive warning control processing on the target battery according to each curve slope, so as to be able to make a judgment and processing in the early stage of the capacity dive phenomenon, with strong timeliness, convenient for early intervention in the capacity dive phenomenon, and improving the use safety of the battery.

[0095] In the technical solution of the present invention, the collection, storage, use, processing, transmission, provision, and disclosure of the user's personal information are all carried out on the premise of obtaining the user's consent, and all comply with the provisions of relevant laws and regulations and do not violate public order and good customs.

[0096] According to the embodiments of the present invention, the present invention also provides an electronic device, a readable storage medium, and a computer program product.

[0097] Figure 6 FIG. is a schematic block diagram of an electronic device 600. The electronic device is intended to represent various forms of digital computers, such as, a laptop computer, a desktop computer, a workbench, a personal digital assistant, a server, a blade server, a mainframe computer, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as, a personal digital processor, a cellular phone, a smart phone, a wearable device, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are only examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0098] As Figure 6As shown, device 600 includes a computing unit 601, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 602 or a computer program loaded from a storage unit 608 into a random access memory (RAM) 603. In the RAM 603, various programs and data required for the operation of the device 600 can also be stored. The computing unit 601, the ROM 602, and the RAM 603 are connected to each other via a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0099] Multiple components in the device 600 are connected to the I / O interface 605, including: an input unit 606, such as a keyboard, a mouse, etc.; an output unit 607, such as various types of displays, speakers, etc.; a storage unit 608, such as a magnetic disk, an optical disc, etc.; and a communication unit 609, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 609 allows the device 600 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0100] The computing unit 601 can be various general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the computing unit 601 include but are not limited to a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The computing unit 601 executes the various methods and processes described above, such as the early warning method for battery capacity drop. For example, in some embodiments, the early warning method for battery capacity drop can be implemented as a computer software program, which is tangibly contained in a machine-readable medium, such as the storage unit 608. In some embodiments, part or all of the computer program can be loaded and / or installed onto the device 600 via the ROM 602 and / or the communication unit 609. When the computer program is loaded into the RAM 603 and executed by the computing unit 601, one or more steps of the early warning method for battery capacity drop described above can be executed. Alternatively, in other embodiments, the computing unit 601 can be configured to execute the early warning method for battery capacity drop by any other appropriate means (e.g., by means of firmware).

[0101] The various embodiments of the systems and techniques described above in this specification can be implemented in digital electronic circuitry, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems-on-chip (SOCs), complex programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include: being implemented in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which can be a special-purpose or general-purpose programmable processor that receives data and instructions from, and transmits data and instructions to, a storage system, at least one input device, and at least one output device.

[0102] The program code for implementing the methods of the present invention can be written in any combination of one or more programming languages. These program codes can be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing device, such that the program codes, when executed by the processor or controller, cause the functions / operations specified in the flowchart and / or block diagram to be implemented. The program code can be executed entirely on the machine, partly on the machine, as a stand-alone software package partly on the machine and partly on a remote machine, or entirely on the remote machine or server.

[0103] In the context of the present invention, a machine-readable medium can be a tangible medium that can contain or store a program for use by or in connection with an instruction execution system, apparatus, or device. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0104] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display device for displaying information to the user (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor); and a keyboard and a pointing device (e.g., a mouse or a trackball), by which the user can provide input to the computer. Other kinds of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0105] The systems and techniques described herein can be implemented in a computing system including backend components (e.g., as a data server), or a computing system including middleware components (e.g., an application server), or a computing system including frontend components (e.g., a user computer having a graphical user interface or a web browser through which the user can interact with an implementation of the systems and techniques described herein), or a computing system including any combination of such backend components, middleware components, or frontend components. The components of the system can be interconnected to each other by digital data communication in any form or medium (e.g., a communication network). Examples of communication networks include: local area network (LAN), wide area network (WAN), and the Internet.

[0106] A computer system can include a client and a server. The client and the server are generally far from each other and usually interact through a communication network. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, or a server of a distributed system, or a server incorporating blockchain.

[0107] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps recited in the present invention can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution disclosed in the present invention can be achieved, and no limitation is imposed herein.

[0108] The above specific embodiments do not constitute a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for warning of battery capacity diving, characterized in that Including: Determine the relationship curve between the end-of-charge voltage and the number of cycles of the target battery; the end-of-charge voltage is the end-of-charge voltage in a charging step that does not use voltage as the cut-off condition. Determine the curve slope at each number of cycles value in the relationship curve. According to each of the curve slopes, perform capacity dive warning control processing on the target battery.

2. The method according to claim 1, wherein The determining the relationship curve between the end-of-charge voltage and the number of cycles of the target battery includes: In a charging step of the target battery that does not use voltage as the cut-off condition, obtain the end-of-charge voltage value and the end-of-charge time point of the target battery. Determine the number of cycles value of the target battery at the end-of-charge time point. According to the end-of-charge voltage value and the number of cycles value at each end-of-charge time point, construct a relationship curve.

3. The method according to claim 2, wherein The constructing a relationship curve according to the end-of-charge voltage value and the number of cycles value at each end-of-charge time point includes: Perform curve fitting processing according to the end-of-charge voltage value and the number of cycles value at each end-of-charge time point to obtain the relationship curve.

4. The method according to claim 1 or 2, characterized in that, The charging step that does not use voltage as the cut-off condition includes a charging step that uses charging time as the cut-off condition.

5. The method according to claim 1, characterized in that, The performing capacity dive warning control processing on the target battery according to each of the curve slopes includes: Determine whether there is a first curve slope among each of the curve slopes; the first curve slope satisfies the capacity dive warning condition. In the case where the first curve slope exists among each of the curve slopes, perform capacity dive warning processing on the target battery. In the case where the first curve slope does not exist among each of the curve slopes, stop performing capacity dive warning processing on the target battery.

6. The method according to claim 5, wherein The performing capacity dive warning processing on the target battery includes: Determine the first end-of-charge voltage corresponding to the first curve slope. Determine the first end-of-charge time point corresponding to the first end-of-charge voltage. According to the first end-of-charge time point and the first curve slope, perform capacity dive warning processing on the target battery.

7. The method according to claim 5, wherein The capacity dive warning condition includes at least one of the following: the curve slope is greater than or equal to the curve slope threshold; the ratio of the curve slope to the steady-state curve slope of the target battery is greater than or equal to the ratio threshold. The curve slope threshold and the ratio threshold are determined according to the test relationship curve of the end-of-charge voltage - number of cycles of a test battery of the same type as the target battery; the test battery is a battery that has experienced capacity dive.

8. The method according to claim 1 or 5, characterized in that The method further includes: Obtain the new end-of-charge voltage value of the target battery and the new number of cycles corresponding to the new end-of-charge voltage value. According to the new end-of-charge voltage value and the new number of cycles, perform update processing on the relationship curve. According to the updated relationship curve, re-perform capacity dive warning control processing on the target battery.

9. The method according to claim 1 or 5, characterized in that, The method further includes: In the case of performing capacity dive warning processing on the target battery, determine the current value and the number of cycles of the small current charge and discharge step. Perform small current charge and discharge processing on the target battery using the small current charge and discharge step according to the said current value and the said number of cycles.

10. An early warning device for battery capacity diving, characterized in that, Including: A first determination module, configured to determine the relationship curve between the charging end voltage and the number of cycles of the target battery; The said charging end voltage is the charging end voltage in the charging step that does not take voltage as the cut-off condition; A second determination module, configured to determine the curve slope at each number of cycles value in the said relationship curve; A control processing module, configured to perform capacity plunge warning control processing on the target battery according to each of the said curve slopes.

11. An electronic device, characterized in that, Including: A processor; A memory for storing instructions executable by the processor; Wherein, the processor is configured to: Implement the steps of the warning method for battery capacity plunge as described in any one of claims 1 to 9.

12. A non-transitory computer-readable storage medium, when the instructions in the storage medium are executed by a processor, enabling the processor to execute the warning method for battery capacity plunge as described in any one of claims 1 to 9.

13. A computer program product, including a computer program, where the computer program, when executed by a processor, implements the warning method for battery capacity plunge as described in any one of claims 1 to 9.

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