Control method and device for charging power battery

Abstract

The application relates to the technical field of power batteries, and discloses a control method and device for charging a power battery. The method comprises the following steps: when detecting that the power battery is being charged, obtaining a historical charging frequency of the power battery, and obtaining a current charging mode of the power battery; if the current charging mode is a fast charging mode and the historical charging frequency is greater than a set charging frequency, obtaining a fast charging frequency of the power battery; determining a first cut-off state of charge of the power battery according to the fast charging frequency of the power battery, wherein the first cut-off state of charge is less than 100%; and if an actual state of charge of the power battery reaches the first cut-off state of charge, controlling the power battery to stop charging. The technical scheme provided by the application can obtain the fast charging frequency of different users, and different fast charging cut-off states of charge can be formulated according to the different fast charging frequencies of the users, so that the service life of the power battery is prolonged.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and discloses a control method and device for charging a power battery. Background Technology

[0002] With the rapid development of new energy vehicles, the power battery, as one of their core components, has become particularly important. Besides battery safety, the lifespan of the power battery is also a key concern for users.

[0003] Fast charging can significantly shorten charging time and improve the user experience by charging at a high rate, but it also directly impacts the lifespan and safety performance of the battery. However, current battery charging methods cannot effectively mitigate the impact of fast charging on battery lifespan and safety performance. Summary of the Invention

[0004] This application relates to the field of power battery technology, and discloses a control method and device for charging power batteries. It can solve the technical problem that existing power battery charging methods cannot effectively reduce the impact of fast charging on battery life and safety performance.

[0005] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0006] According to one aspect of the embodiments of this application, a control method for charging a power battery is provided. The method includes: when power battery charging is detected, acquiring the historical number of times the power battery has been charged and acquiring the current charging mode of the power battery; if the current charging mode is a fast charging mode and the historical number of times the ...

[0007] In one embodiment of this application, based on the aforementioned scheme, obtaining the fast charging frequency of the power battery includes: obtaining the total number of fast charging times of the power battery in the current and historical periods; calculating the ratio of the total number of fast charging times to the historical number of charging times as the fast charging frequency of the power battery.

[0008] In one embodiment of this application, based on the foregoing scheme, the method further includes: if the current charging mode is a slow charging mode, or the number of historical charging times is less than or equal to the set number of charging times, then determining the second cut-off charge level of the power battery, wherein the second cut-off charge level is equal to 100%.

[0009] In one embodiment of this application, based on the aforementioned scheme, determining the first cutoff charge capacity of the power battery according to the fast charging frequency of the power battery includes: obtaining the initial fast charging count of the power battery, wherein the initial fast charging count is the number of fast charging counts of the power battery when the historical charging count is equal to the set charging count; if the fast charging frequency is greater than or equal to the set frequency threshold, then calculating the first charge capacity of the power battery based on the initial fast charging count and the total fast charging count, as the first cutoff charge capacity of the power battery; if the fast charging frequency is less than the set frequency threshold, then calculating the second charge capacity of the power battery based on the initial fast charging count and the total fast charging count, as the first cutoff charge capacity of the power battery.

[0010] In one embodiment of this application, based on the foregoing scheme, after determining the first cutoff charge of the power battery according to the fast charging frequency of the power battery, the method further includes: obtaining the ambient temperature of the power battery; correcting the first cutoff charge according to the ambient temperature, and using the corrected first cutoff charge as the new first cutoff charge.

[0011] In one embodiment of this application, based on the foregoing scheme, the first charge or the second charge is calculated using the following formula:

[0012] SOC = 100% - (NM) / 10 * α

[0013] Where SOC is the first or second charge capacity, N is the total number of fast charging cycles, M is the initial number of fast charging cycles, and α is the adjustment coefficient.

[0014] In one embodiment of this application, based on the aforementioned scheme, the step of correcting the first cutoff charge based on the ambient temperature includes: if the ambient temperature is less than a set temperature threshold, then calculating the third charge of the power battery as the corrected first cutoff charge.

[0015] In one embodiment of this application, based on the foregoing scheme, the third charge capacity of the power battery is calculated using the following formula:

[0016] SOC 修 =SOC+(-T)*β

[0017] Among them, SOC 修 The corrected first cutoff charge is SOC, which is either the first or second charge, T is the ambient temperature, and β is the correction factor.

[0018] In one embodiment of this application, based on the foregoing scheme, after controlling the power battery to stop charging, the method further includes: if the first cutoff charge is less than or equal to a set charge, then the set charge is used as a target cutoff charge, wherein the target cutoff charge is the charge that the power battery needs to reach when charging in the future.

[0019] According to one aspect of the embodiments of this application, a control device for charging a power battery is provided. The device includes: a first acquisition unit, configured to acquire the historical number of times the power battery has been charged and the current charging mode of the power battery when charging of the power battery is detected; a second acquisition unit, configured to acquire the fast charging frequency of the power battery if the current charging mode is a fast charging mode and the historical number of times the ...

[0020] In one embodiment of this application, based on the foregoing scheme, the second acquisition unit is configured to: acquire the total number of fast charging times of the power battery in the current and historical periods; and calculate the ratio of the total number of fast charging times to the historical number of charging times as the fast charging frequency of the power battery.

[0021] In one embodiment of this application, based on the foregoing scheme, the device further includes a first determination unit, which is used to determine the second cut-off charge level of the power battery if the current charging mode is a slow charging mode, or the number of historical charging times is less than or equal to the set number of charging times, wherein the second cut-off charge level is equal to 100%.

[0022] In one embodiment of this application, based on the foregoing scheme, the determining unit is configured to: obtain the initial fast charging count of the power battery, wherein the initial fast charging count is the number of fast charging counts of the power battery when the historical charging count is equal to the set charging count; if the fast charging frequency is greater than or equal to the set frequency threshold, then calculate the first charge capacity of the power battery based on the initial fast charging count and the total fast charging count, and use it as the first cutoff charge capacity of the power battery; if the fast charging frequency is less than the set frequency threshold, then calculate the second charge capacity of the power battery based on the initial fast charging count and the total fast charging count, and use it as the first cutoff charge capacity of the power battery.

[0023] In one embodiment of this application, based on the foregoing scheme, the determining unit is further configured to: calculate the first charge or the second charge using the following formula:

[0024] SOC = 100% - (NM) / 10 * α

[0025] Where SOC is the first or second charge capacity, N is the total number of fast charging cycles, M is the initial number of fast charging cycles, and α is the adjustment coefficient.

[0026] In one embodiment of this application, based on the foregoing scheme, the device further includes a correction unit, which is used to obtain the ambient temperature of the power battery; correct the first cut-off charge based on the ambient temperature, and use the corrected first cut-off charge as the new first cut-off charge.

[0027] In one embodiment of this application, based on the aforementioned scheme, the correction unit is configured to: if the ambient temperature is less than a set temperature threshold, calculate the third charge of the power battery as the corrected first cutoff charge.

[0028] In one embodiment of this application, based on the foregoing scheme, the correction unit is further configured to calculate the third charge capacity of the power battery using the following formula:

[0029] SOC 修 =SOC+(-T)*β

[0030] Among them, SOC 修 The corrected first cutoff charge is SOC, which is either the first or second charge, T is the ambient temperature, and β is the correction factor.

[0031] In one embodiment of this application, based on the foregoing scheme, the device further includes a second determination unit, which is used to determine the target cutoff charge as the set charge if the first cutoff charge is less than or equal to the set charge. The target cutoff charge is the charge that the power battery needs to reach when it is charged in the future.

[0032] This application provides a control method and apparatus for charging a power battery, comprising: when power battery charging is detected, acquiring the historical number of times the power battery has been charged and acquiring the current charging mode of the power battery; if the current charging mode is a fast charging mode and the historical number of times the number of times the battery has been charged is greater than a set number of times the battery has been charged, then acquiring the fast charging frequency of the power battery; determining a first cut-off charge level of the power battery based on the fast charging frequency of the power battery, wherein the first cut-off charge level is less than 100%; if the actual charge level of the power battery reaches the first cut-off charge level, then controlling the power battery to stop charging; thus, compared with the prior art, which controls the power battery charging by simply using stepped charging or high charge current limiting, this application addresses the different charging habits of different users and the different rates of power battery life degradation. It first determines the user's charging habits, then determines different fast charging frequencies for different users, and then sets different fast charging cut-off charge levels based on the different user fast charging frequencies, controlling the power battery to stop charging when the actual charge level reaches the fast charging cut-off charge level, thereby extending the service life of the power battery to a certain extent.

[0033] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0034] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0035] Figure 1 A flowchart of a power battery charging control method according to an embodiment of this application is shown;

[0036] Figure 2 A flowchart of a power battery charging control method according to a specific embodiment of this application is shown;

[0037] Figure 3 A block diagram of a power battery charging control device according to an embodiment of this application is shown. Detailed Implementation

[0038] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0039] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0040] It should be noted that "multiple" in this article refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0041] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such uses of these terms can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described.

[0042] The implementation details of the technical solutions in the embodiments of this application are described in detail below:

[0043] This application provides a method for controlling the charging of a power battery. Figure 1 A flowchart of the control method for charging a power battery according to an embodiment of this application is shown, such as... Figure 1 As shown, the control method for charging the power battery includes at least steps 110 to 140.

[0044] The following will be about Figure 1 Steps 110 to 140 are described in detail below:

[0045] In step 110, when the power battery is detected to be charging, the historical number of times the power battery has been charged and the current charging mode of the power battery are obtained.

[0046] In this application, when the charging of the power battery is detected, the historical number of times the power battery has been charged is obtained. Based on the historical number of times the power battery has been charged, it can be determined whether the user's charging habits can be summarized. If the user's charging habits can be obtained, a differentiated charging strategy can be formulated based on the user's charging habits.

[0047] When the power battery is detected to be charging, the current charging mode of the power battery can also be obtained. Depending on whether the current charging mode of the power battery is fast charging mode or slow charging mode, the charging strategy corresponding to each charging mode can be executed.

[0048] Continue to refer to Figure 1 In step 120, if the current charging mode is fast charging mode and the number of historical charging times is greater than the set number of charging times, then the fast charging frequency of the power battery is obtained.

[0049] In this application, if the current charging mode is fast charging mode and the historical charging count is greater than the set charging count, the fast charging frequency of the power battery is obtained, and the charging strategy corresponding to the current charging mode being fast charging mode is determined based on the power battery's fast charging frequency. The set charging count can be 50 times, 60 times, or can be set according to actual needs; no limitation is imposed here.

[0050] In one embodiment, obtaining the fast charging frequency of the power battery includes: obtaining the total number of fast charging times of the power battery in the current and historical periods; and calculating the ratio of the total number of fast charging times to the historical number of charging times as the fast charging frequency of the power battery.

[0051] In this application, the historical number of fast charging cycles of the power battery can be used as the total number of fast charging cycles, or the sum of the current and historical number of fast charging cycles of the power battery can be used as the total number of fast charging cycles. The ratio of the total number of fast charging cycles to the historical number of charging cycles is calculated as the fast charging frequency of the power battery. The fast charging frequency of the power battery will change with the change of the total number of fast charging cycles or the historical number of charging cycles. The value range of the fast charging frequency of the power battery is 0 to 1.

[0052] Continue to refer to Figure 1 In step 130, the first cut-off charge capacity of the power battery is determined according to the fast charging frequency of the power battery, and the first cut-off charge capacity is less than 100%.

[0053] In one embodiment, determining the first cutoff charge capacity of the power battery based on the fast charging frequency of the power battery includes: obtaining the initial number of fast charging cycles of the power battery, wherein the initial number of fast charging cycles is the number of fast charging cycles of the power battery when the historical number of charging cycles is equal to the set number of charging cycles; if the fast charging frequency is greater than or equal to the set frequency threshold, then calculating the first charge capacity of the power battery based on the initial number of fast charging cycles and the total number of fast charging cycles, as the first cutoff charge capacity of the power battery; if the fast charging frequency is less than the set frequency threshold, then calculating the second charge capacity of the power battery based on the initial number of fast charging cycles and the total number of fast charging cycles, as the first cutoff charge capacity of the power battery.

[0054] In this application, the number of fast-charging cycles of the power battery when the historical charging cycle equals the set charging cycle is obtained as the initial number of fast-charging cycles of the power battery. If the fast-charging frequency is greater than or equal to a set frequency threshold, the first charge capacity of the power battery can be calculated based on the initial number of fast-charging cycles and the total number of fast-charging cycles, and this is used as the first cut-off charge capacity of the power battery. If the fast-charging frequency is less than the set frequency threshold, the second charge capacity of the power battery can be calculated based on the initial number of fast-charging cycles and the total number of fast-charging cycles, and this is used as the first cut-off charge capacity of the power battery. The set frequency threshold can be 50%, 60%, or can be set according to actual needs; no limitation is imposed here.

[0055] In one implementation, the first charge or the second charge is calculated using the following formula:

[0056] SOC = 100% - (NM) / 10 * α

[0057] Where SOC is the first or second charge capacity, N is the total number of fast charging cycles, M is the initial number of fast charging cycles, and α is the adjustment coefficient.

[0058] In this application, the adjustment coefficients used in the formulas for calculating the first charge and the second charge are different. The first adjustment coefficient α1 used to calculate the first charge is greater than the second adjustment coefficient α2 used to calculate the second charge. The first adjustment coefficient α1 can be 0.2%, and the second adjustment coefficient α2 can be 0.05%. Both the first and second adjustment coefficients can be set according to actual needs, and there are no restrictions here.

[0059] When the fast charging frequency is greater than or equal to the set frequency threshold, it can be understood that the user's charging habits tend to favor the use of fast charging mode. However, frequent use of fast charging mode may damage the power battery, causing the power battery life to degrade too quickly. Therefore, for users whose charging habits tend to favor the use of fast charging mode, when fast charging the power battery, it is necessary to limit the cutoff charge of the power battery to a lower charge level in order to extend the life of the power battery while meeting the user's needs.

[0060] When the fast charging frequency is less than the set frequency threshold, it can be understood that the user's charging habits tend to favor slow charging. Frequent use of slow charging will not damage the power battery, resulting in a slower battery lifespan degradation. In other words, the lifespan of a power battery that is frequently used in slow charging mode is longer than that of a power battery that is frequently used in fast charging mode. Therefore, for users whose charging habits tend to favor slow charging mode, when fast charging the power battery, it may be due to the user's urgent travel needs. In this case, the cutoff charge of the power battery can be slightly limited to a higher charge level to meet the user's need to fully charge the power battery to the required charge level in a short time.

[0061] Meanwhile, considering that the low temperature in winter may cause the power battery's energy to decrease, if it is necessary to ensure the power battery's charge capacity in low temperature environments, it is necessary to add an ambient temperature judgment and correct the power battery's cutoff charge capacity based on the ambient temperature of the power battery.

[0062] That is, in one embodiment, after determining the first cutoff charge of the power battery based on the fast charging frequency of the power battery, the method further includes: obtaining the ambient temperature of the power battery; correcting the first cutoff charge based on the ambient temperature; and using the corrected first cutoff charge as the new first cutoff charge.

[0063] In one embodiment, the step of correcting the first cutoff charge based on the ambient temperature includes: if the ambient temperature is less than a set temperature threshold, calculating a third charge of the power battery as the corrected first cutoff charge.

[0064] In this application, if the ambient temperature is lower than a set temperature threshold, it can be understood that the first cutoff charge needs to be corrected to ensure the charge of the power battery in a low-temperature environment. Based on the ambient temperature, the third charge of the power battery is calculated as the corrected first cutoff charge. The set temperature threshold can be 0°C, or it can be set according to actual needs, and there is no limitation here.

[0065] In one embodiment, the third charge of the power battery is calculated using the following formula:

[0066] SOC 修 =SOC+(-T)*β

[0067] Among them, SOC 修 The corrected first cutoff charge is SOC, which is either the first or second charge, T is the ambient temperature, and β is the correction factor.

[0068] In this application, the corrected first cutoff charge is greater than the first cutoff charge, and the corrected first cutoff charge is less than or equal to 100%. If the calculated result of the corrected first cutoff charge is greater than 100%, then the corrected first cutoff charge is determined to be 100%. The correction factor can be 0.5%, or it can be set according to actual needs, and there is no restriction here.

[0069] In addition, if the ambient temperature is greater than or equal to the set temperature threshold, it can be understood that the first cutoff charge does not need to be corrected and remains unchanged, or it can be understood that the corrected first cutoff charge is equal to the first cutoff charge.

[0070] In one embodiment, the method further includes: if the current charging mode is a slow charging mode, or the number of historical charging times is less than or equal to the set number of charging times, then determining the second cut-off charge level of the power battery, wherein the second cut-off charge level is equal to 100%.

[0071] In this application, if the current charging mode is slow charging mode, since charging the power battery through slow charging mode will not damage the power battery, the second cut-off charge of the power battery can be determined as 100%.

[0072] When the number of historical charging cycles is less than or equal to the set number of charging cycles, it can be understood that the number of times the power battery has been used and charged is relatively small, the battery health is relatively good, and the number of charging cycles is small, so it is impossible to obtain the user's charging habits. In this case, the second cutoff charge capacity of the power battery can be determined as 100%.

[0073] Continue to refer to Figure 1 In step 140, if the actual charge of the power battery reaches the first cutoff charge, the power battery is controlled to stop charging.

[0074] In this application, when the current charging mode is fast charging, if the actual charge level of the power battery reaches the first cutoff charge level, the power battery is controlled to stop charging. When the current charging mode is slow charging, or when the number of historical charging cycles is less than or equal to the set number of charging cycles, if the actual charge level of the power battery reaches the second cutoff charge level, the power battery is controlled to stop charging.

[0075] During the charging process of the power battery, the charging current of the power battery can be set according to the health status of the power battery. For example, if the health status of the power battery is 100%, the actual charging current of the power battery can be the set charging current. If the health status of the power battery is 90%, the actual charging current of the power battery can be 0.9 * the set charging current.

[0076] After each power battery stops charging, the target cut-off charge of the power battery at the next charging time can be determined based on the actual charge of the power battery.

[0077] That is, in one embodiment, after controlling the power battery to stop charging, the method further includes: if the first cut-off charge is less than or equal to a set charge, then the set charge is used as a target cut-off charge, the target cut-off charge being the charge that the power battery needs to reach when charging in the future.

[0078] In this application, if the first cutoff charge is less than or equal to the set charge, to prevent the cutoff charge of the power battery from decreasing further during subsequent charging and affecting the user experience, the set charge is used as the target cutoff charge to ensure the power battery has sufficient charge for user operation. The set charge can be 80%, or it can be set according to actual needs; there is no limitation here.

[0079] In other words, when charging in the future, starting from the next charge, the target cutoff charge level will no longer change. When the charging mode is fast charging, if the actual charge level of the power battery reaches the target cutoff charge level, the power battery will be controlled to stop charging.

[0080] In addition, if the first cutoff charge is greater than the set charge, the historical charging count and historical fast charging count can be updated so that the charging strategy for fast charging can be dynamically adjusted according to the increase of the charging count or fast charging count.

[0081] To enable those skilled in the art to more readily understand this application, reference will be made below. Figure 2 This application will be illustrated by a specific embodiment.

[0082] Figure 2 A flowchart illustrating a control method for charging a power battery according to a specific embodiment of this application is shown. The specific steps are as follows:

[0083] Step 1: Record the user's charging mode, total number of charging times (n), and total number of fast charging times (n) for each charge using a big data platform. 快充 ;

[0084] Step 2: When the number of times the user charges, n, reaches the set number of 50 charging times, it is the first charging mode cycle. The initial number of fast charging times in the first cycle is recorded as n1. The user's charging habits, including the frequency of fast charging, are determined through big data.

[0085] Step 3: When the power battery is detected to start charging, determine whether the current charging mode is fast charging mode. If yes, proceed to step 4; otherwise, proceed to step 10.

[0086] Step 4, determine the frequency of fast charging usage n 快充 If / n is greater than or equal to the set frequency threshold of 60%, then proceed to step 5; otherwise, proceed to step 6.

[0087] Step 5: Calculate the first state of charge (SOC) of the power battery based on the initial number of fast charges and the total number of fast charges. This SOC is used as the first cutoff state of charge for the power battery. The calculation formula is: SOC = 100% - (n 快充 -n1) / 10*0.2%;

[0088] Step 6: Calculate the first charge capacity of the power battery based on the initial number of fast charges and the total number of fast charges. This first charge capacity is used as the first cutoff charge capacity of the power battery. The calculation formula is: SOC = 100% - (n 快充 -n1) / 10*0.05%;

[0089] Step 7: Determine whether the ambient temperature T of the power battery is greater than or equal to the set temperature threshold of 0℃. If yes, proceed to step 8; otherwise, proceed to step 9.

[0090] Step 8: Correct the first cutoff charge value and use the corrected first cutoff charge value as the new first cutoff charge value. The formula for calculating the corrected first cutoff charge value is: SOC 修 =SOC;

[0091] Step 9: Correct the first cutoff charge and use the corrected first cutoff charge as the new first cutoff charge. The formula for calculating the corrected first cutoff charge is: SOC 修 =SOC + (-T) * 0.5%;

[0092] Step 10: Determine that the second cutoff charge of the power battery is 100%;

[0093] Step 11: If the current charging mode is fast charging mode, the actual charge of the power battery reaches the first cutoff charge, and the power battery is controlled to stop charging. If the current charging mode is slow charging mode or the number of historical charging times is less than or equal to the set number of charging times, the actual charge of the power battery reaches the second cutoff charge, and the power battery is controlled to stop charging.

[0094] Step 12: Determine whether the first cutoff charge is greater than 80% of the set charge. If yes, proceed to step 13; otherwise, proceed to step 14.

[0095] Step 13: Update the historical charging count and historical fast charging count;

[0096] Step 14: Stop updating historical charging times and historical fast charging times. In future charging, set 80% charge capacity as the target cut-off charge capacity, and the target cut-off charge capacity will not change. If the charging mode is fast charging mode and the actual charge capacity of the power battery reaches the target cut-off charge capacity, then control the power battery to stop charging.

[0097] The one or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0098] The technical solution proposed in this application takes into account the differences in the usage of fast and slow charging by different users. Under different user charging habits, the lifespan of the power battery will also degrade at different rates. Different user fast charging frequencies are determined for different user charging habits, and different fast charging cut-off charge levels are set according to different user fast charging frequencies, thereby extending the lifespan of power batteries with high fast charging usage.

[0099] The technical solution proposed in this application also takes into account the influence of ambient temperature on the power battery during charging, and corrects the fast charging cutoff charge of the power battery in low-temperature environments so that the actual charge of the power battery can reach the charge required by the user even in low-temperature environments.

[0100] The following describes an embodiment of the apparatus described in this application, which can be used to execute the power battery charging control method described in the above embodiments of this application. For details not disclosed in the apparatus embodiments of this application, please refer to the embodiments of the power battery charging control method described above in this application.

[0101] Figure 3 A block diagram of a power battery charging control device according to an embodiment of this application is shown.

[0102] like Figure 3 As shown in the embodiment of this application, the power battery charging control device 300 includes: a first acquisition unit 301, a second acquisition unit 302, a determination unit 303, and a control unit 304.

[0103] The first acquisition unit 301 is used to acquire the historical number of times the power battery has been charged and the current charging mode of the power battery when charging is detected; the second acquisition unit 302 is used to acquire the fast charging frequency of the power battery if the current charging mode is a fast charging mode and the historical number of times the power battery has been charged is greater than a set number of times; the determination unit 303 is used to determine the first cutoff charge level of the power battery based on the fast charging frequency of the power battery, wherein the first cutoff charge level is less than 100%; and the control unit 304 is used to control the power battery to stop charging if the actual charge level of the power battery reaches the first cutoff charge level.

[0104] In one embodiment of this application, based on the aforementioned scheme, the second acquisition unit 302 is configured to: acquire the total number of fast charging times of the power battery in the current and historical periods; and calculate the ratio of the total number of fast charging times to the historical number of charging times as the fast charging frequency of the power battery.

[0105] In one embodiment of this application, based on the foregoing scheme, the device further includes a first determination unit, which is used to determine the second cut-off charge level of the power battery if the current charging mode is a slow charging mode, or the number of historical charging times is less than or equal to the set number of charging times, wherein the second cut-off charge level is equal to 100%.

[0106] In one embodiment of this application, based on the aforementioned scheme, the determining unit 303 is configured to: obtain the initial fast charging count of the power battery, wherein the initial fast charging count is the number of fast charging counts of the power battery when the historical charging count is equal to the set charging count; if the fast charging frequency is greater than or equal to the set frequency threshold, then calculate the first charge capacity of the power battery based on the initial fast charging count and the total fast charging count, and use it as the first cutoff charge capacity of the power battery; if the fast charging frequency is less than the set frequency threshold, then calculate the second charge capacity of the power battery based on the initial fast charging count and the total fast charging count, and use it as the first cutoff charge capacity of the power battery.

[0107] In one embodiment of this application, based on the foregoing scheme, the determining unit 303 is further configured to: calculate the first charge or the second charge using the following formula:

[0108] SOC = 100% - (NM) / 10 * α

[0109] Where SOC is the first or second charge capacity, N is the total number of fast charging cycles, M is the initial number of fast charging cycles, and α is the adjustment coefficient.

[0110] In one embodiment of this application, based on the foregoing scheme, the device further includes a correction unit, which is used to obtain the ambient temperature of the power battery; correct the first cut-off charge based on the ambient temperature, and use the corrected first cut-off charge as the new first cut-off charge.

[0111] In one embodiment of this application, based on the aforementioned scheme, the correction unit is configured to: if the ambient temperature is less than a set temperature threshold, calculate the third charge of the power battery as the corrected first cutoff charge.

[0112] In one embodiment of this application, based on the foregoing scheme, the correction unit is further configured to calculate the third charge capacity of the power battery using the following formula:

[0113] SOC 修 =SOC+(-T)*β

[0114] Among them, SOC 修 The corrected first cutoff charge is SOC, which is either the first or second charge, T is the ambient temperature, and β is the correction factor.

[0115] In one embodiment of this application, based on the foregoing scheme, the device further includes a second determination unit, which is used to determine the target cutoff charge as the set charge if the first cutoff charge is less than or equal to the set charge. The target cutoff charge is the charge that the power battery needs to reach when it is charged in the future.

[0116] This application also provides a computer program product including computer instructions stored in a computer-readable storage medium and adapted to be read and executed by a processor to cause a computer device having the processor to perform the power battery charging control method as described in any of the above embodiments.

[0117] This application also provides an electronic device, which includes one or more processors and one or more memories, wherein at least one piece of program code is stored in the one or more memories, and the at least one piece of program code is loaded and executed by the one or more processors to implement the power battery charging control method described in any of the above embodiments.

[0118] This application also provides a computer-readable medium, which may be included in an electronic device or exist independently without being assembled into an electronic device. The computer-readable storage medium stores at least one line of program code, which is loaded and executed by a processor to implement the power battery charging control method described in any of the above embodiments.

[0119] It should be noted that the computer-readable medium shown in the embodiments of this application can be a computer-readable signal medium or a computer-readable storage medium, or any combination of the two. A computer-readable storage medium can be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), flash memory, optical fiber, portable compact disc read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0120] In this application, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in connection with an instruction execution system, apparatus, or device. In this application, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to wireless, wired, etc., or any suitable combination thereof.

[0121] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. Each block in a flowchart or block diagram may represent a module, segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0122] The units described in the embodiments of this application can be implemented in software or hardware, and the described units can also be located in a processor. The names of these units do not necessarily limit the specific unit itself.

[0123] It should be noted that although several modules or units for the device used to perform actions have been mentioned in the detailed description above, this division is not mandatory. In fact, according to the embodiments of this application, the features and functions of two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided and embodied by multiple modules or units.

[0124] Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of this application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, external hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, server, touch terminal, or network device, etc.) to execute the method according to the embodiments of this application.

[0125] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein.

[0126] Furthermore, the above figures are merely illustrative of the processes included in the method according to exemplary embodiments of this application, and are not intended to be limiting. It is readily understood that the processes shown in the above figures do not indicate or limit the temporal order of these processes. Additionally, it is readily understood that these processes may be executed synchronously or asynchronously, for example, in multiple modules.

[0127] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A control method for charging a power battery, characterized in that, The method includes: When the power battery is detected to be charging, the historical number of times the power battery has been charged and the current charging mode of the power battery are obtained. If the current charging mode is fast charging mode and the number of historical charging times is greater than the set number of charging times, then the fast charging frequency of the power battery is obtained. Based on the fast charging frequency of the power battery, a first cutoff charge level of the power battery is determined, wherein the first cutoff charge level is less than 100%. Determining the first cutoff charge capacity of the power battery based on the fast charging frequency of the power battery includes: The initial fast charging count of the power battery is obtained, wherein the initial fast charging count is the number of times the power battery is fast charged when the historical charging count is equal to the set charging count; If the fast charging frequency is greater than or equal to a set frequency threshold, then the first charge capacity of the power battery is calculated based on the initial number of fast charging cycles and the total number of fast charging cycles of the power battery in the current and historical periods, and is used as the first cutoff charge capacity of the power battery. If the fast charging frequency is less than the set frequency threshold, then the second charge capacity of the power battery is calculated based on the initial fast charging count and the total fast charging count, and is used as the first cutoff charge capacity of the power battery; If the actual charge of the power battery reaches the first cutoff charge, then the power battery is controlled to stop charging.

2. The method according to claim 1, characterized in that, The step of obtaining the fast charging frequency of the power battery includes: Obtain the total number of fast charging cycles for the power battery in the current and historical periods; The ratio of the total number of fast charging cycles to the number of historical charging cycles is calculated and used as the fast charging frequency of the power battery.

3. The method according to claim 1, characterized in that, The method further includes: If the current charging mode is slow charging mode, or the number of historical charging times is less than or equal to the set number of charging times, then the second cut-off charge level of the power battery is determined, and the second cut-off charge level is equal to 100%.

4. The method according to claim 1, characterized in that, After determining the first cutoff charge capacity of the power battery based on the fast charging frequency of the power battery, the method further includes: Obtain the ambient temperature of the power battery; The first cutoff charge is corrected based on the ambient temperature, and the corrected first cutoff charge is taken as the new first cutoff charge.

5. The method according to claim 1, characterized in that, The first charge or the second charge is calculated using the following formula: in, SOC For the first charge or the second charge, N Total number of fast charging cycles M This is the initial number of fast charge cycles. α This is for adjusting the coefficient.

6. The method according to claim 4, characterized in that, The step of correcting the first cutoff charge based on the ambient temperature includes: If the ambient temperature is less than the set temperature threshold, the third charge of the power battery is calculated as the corrected first cutoff charge.

7. The method according to claim 6, characterized in that, The third charge of the power battery is calculated using the following formula: in, SOC 修 The corrected first cutoff charge. SOC For the first charge or the second charge, T For ambient temperature, β This is a correction factor.

8. The method according to claim 1 or 2, characterized in that, After controlling the power battery to stop charging, the method further includes: If the first cutoff charge is less than or equal to the set charge, then the set charge is taken as the target cutoff charge, which is the charge that the power battery needs to reach when it is charged in the future.

9. A control device for charging a power battery, characterized in that, The device includes: The first acquisition unit is used to acquire the historical number of times the power battery has been charged and the current charging mode of the power battery when charging is detected. The second acquisition unit is used to acquire the fast charging frequency of the power battery if the current charging mode is fast charging mode and the number of historical charging times is greater than the set number of charging times. The determining unit is used to determine the first cutoff charge level of the power battery based on the fast charging frequency of the power battery, wherein the first cutoff charge level is less than 100%. The determining unit is specifically used to obtain the initial fast charging count of the power battery, wherein the initial fast charging count is the number of fast charging counts of the power battery when the historical charging count is equal to the set charging count; if the fast charging frequency is greater than or equal to the set frequency threshold, then the first charge capacity of the power battery is calculated based on the initial fast charging count and the total fast charging count of the power battery in the current and historical periods, and is used as the first cutoff charge capacity of the power battery; if the fast charging frequency is less than the set frequency threshold, then the second charge capacity of the power battery is calculated based on the initial fast charging count and the total fast charging count, and is used as the first cutoff charge capacity of the power battery. The control unit is used to control the power battery to stop charging if the actual charge of the power battery reaches the first cutoff charge.

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