Charging method and device, equipment, storage medium and vehicle

Abstract

The invention discloses a charging method and device, equipment, a storage medium and a vehicle. The method comprises the following steps: in the nth charging cycle process, acquiring a first charging duration of charging a battery from 0% SOC to 100% SOC; under the condition that the first charging duration is larger than the second charging duration, in the (n + 1) th charging cycle process, target voltage is obtained, and the target voltage is any one of multiple charging cut-off voltages defined in an original charging strategy; obtaining a theoretical SOC corresponding to the target voltage; and under the condition that the theoretical SOC is smaller than the target SOC, in multiple charging stages after the target voltage, charging the battery in stages by taking the SOC corresponding to the multiple charging cut-off voltages in the original charging strategy as a charging cut-off condition. According to the charging method provided by the embodiment of the invention, the charging duration of the battery relative to the last charging cycle can be reduced, the charging duration of the battery is prevented from being longer and longer, and the use experience of a user on the battery is improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a charging method, device, equipment, storage medium and vehicle. Background Art

[0002] At present, the battery can be charged in stages according to the charging strategy. In the process of staged charging, the cutoff condition for charging in each stage is that the voltage value in the battery reaches the voltage value specified in the charging strategy. In actual situations, as the number of battery charging cycles increases, the positive and negative electrodes of the battery will decay and the loss of active lithium will increase. In this way, in the prior art, as the battery ages, the charging current / charging rate is usually reduced to avoid lithium precipitation and ensure the safety of the battery.

[0003] However, as the battery ages, the impedance of the battery increases, causing the battery to reach the voltage value specified in the charging strategy faster under the same rate conditions. For example, in the staged charging process, the schematic diagram of the cycle data comparison with the voltage value as the cut-off condition can be as follows Figure 1 As shown. During the staged charging process, the charging rate is reduced each time a voltage value is reached, which results in a longer charging time at a lower charging rate, thus causing the battery charging time to become longer and longer, affecting the user's experience of using the battery. Summary of the invention

[0004] The embodiments of the present application provide a charging method, apparatus, device, storage medium and vehicle, which can reduce the charging time of a battery relative to the previous charging cycle, avoid the charging time of the battery becoming longer and longer, and improve the user's battery experience.

[0005] In a first aspect, an embodiment of the present application provides a charging method, the method comprising:

[0006] During the nth charging cycle, obtaining a first charging time of charging the battery from 0% SOC to 100% SOC, where n is a positive integer greater than 1;

[0007] When the first charging time is greater than the second charging time, during the n+1th charging cycle, a target voltage is obtained, where the target voltage is any one of a plurality of charging cut-off voltages defined in the original charging strategy, and the second charging time is the charging time for charging the battery from 0% SOC to 100% SOC during the first charging cycle;

[0008] Obtaining a theoretical SOC corresponding to the target voltage;

[0009] When the theoretical SOC is less than the target SOC, in multiple charging stages after the target voltage, the battery is charged in stages using the SOCs corresponding to the multiple charging cut-off voltages in the original charging strategy as charging cut-off conditions, and the target SOC is the theoretical SOC corresponding to the target voltage during the first charging cycle.

[0010] In a possible implementation manner, after obtaining the theoretical SOC corresponding to the target voltage, the method further includes:

[0011] When the theoretical SOC is not less than the target SOC, the target voltage is increased, and the step of obtaining the theoretical SOC corresponding to the target voltage is returned to execution until the theoretical SOC is less than the target SOC.

[0012] In a possible implementation, after charging the battery in stages using the SOCs corresponding to the multiple charging cut-off voltages in the original charging strategy as charging cut-off conditions, the method further includes:

[0013] Obtaining a third charging duration, where the third charging duration is a charging duration for charging the battery from 0% SOC to 100% SOC during the n+1th charging cycle;

[0014] When the third charging time is not greater than the second charging time, in the charging cycle after the n+1th charging cycle, the battery is charged in stages with the SOC as the charging cut-off condition in multiple charging stages after the target voltage, until the number of charging cycles reaches a preset number or the charging time is greater than the second charging time;

[0015] Return to execute the step of obtaining the target voltage.

[0016] In a possible implementation manner, after obtaining the third charging duration, the method further includes:

[0017] When the third charging time is greater than the second charging time, during the charging cycle after the n+1th charging cycle, the target voltage is reduced, and the process of obtaining the theoretical SOC corresponding to the target voltage is returned to execution until the third charging time is no greater than the second charging time.

[0018] In a possible implementation, in the multiple charging stages after the target voltage, the battery is charged in stages using the SOCs corresponding to the multiple charging cut-off voltages in the original charging strategy as charging cut-off conditions, including:

[0019] Acquire a first charging rate corresponding to a target charging stage, wherein the target charging stage is any one of a plurality of charging stages after the target voltage;

[0020] Increasing the first charging rate to a second charging rate, wherein the second charging rate is no greater than a target lithium precipitation window corresponding to the target charging stage, wherein the target lithium precipitation window represents a maximum rate at which the battery is normally charged during the target charging stage during the n+1th charging cycle;

[0021] The SOC corresponding to the charging cut-off voltage of the target charging stage in the original charging strategy is used as a charging cut-off condition, and the battery is charged at the target charging stage at the second charging rate.

[0022] In a possible implementation, in the multiple charging stages after the target voltage, after charging the battery in stages using the SOCs corresponding to the multiple charging cut-off voltages in the original charging strategy as charging cut-off conditions, the method further includes:

[0023] Performing lithium deposition detection on the battery;

[0024] When the battery is in a lithium deposition state, the charging rate corresponding to the lithium deposition state is reduced to restore the battery to a normal state.

[0025] In a possible implementation manner, the obtaining a theoretical SOC corresponding to the target voltage includes:

[0026] Acquire a first voltage corresponding to the target voltage, where the first voltage is a voltage generated by the battery during polarization;

[0027] Calculating a difference between the target voltage and the first voltage to obtain a second voltage, where the second voltage is a voltage of the battery corresponding to the target voltage when the battery is not polarized;

[0028] According to the corresponding relationship between the preset second voltage and the SOC, the SOC corresponding to the second voltage is determined, and a theoretical SOC corresponding to the target voltage is obtained.

[0029] In a second aspect, an embodiment of the present application provides a charging device, the device comprising:

[0030] A first acquisition module, used for acquiring a first charging time length of the battery from 0% SOC to 100% SOC during an nth charging cycle, where n is a positive integer greater than 1;

[0031] A second acquisition module is used to acquire a target voltage during the n+1th charging cycle when the first charging time is greater than the second charging time, wherein the target voltage is any one of a plurality of charging cut-off voltages defined in the original charging strategy, and the second charging time is the charging time for charging the battery from 0% SOC to 100% SOC during the first charging cycle;

[0032] A third acquisition module, used to acquire a theoretical SOC corresponding to the target voltage;

[0033] The first charging module is used to charge the battery in stages in a plurality of charging stages after the target voltage, using the SOCs corresponding to the plurality of charging cut-off voltages in the original charging strategy as charging cut-off conditions when the theoretical SOC is less than the target SOC, and the target SOC is the theoretical SOC corresponding to the target voltage during the first charging cycle.

[0034] In a third aspect, an embodiment of the present application provides an electronic device, the electronic device comprising: a processor and a memory storing computer program instructions;

[0035] When the processor executes the computer program instructions, the processor implements any possible implementation method of the first aspect described above.

[0036] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having computer program instructions stored thereon, which, when executed by a processor, implements a method in any possible implementation method of the first aspect described above.

[0037] In a fifth aspect, an embodiment of the present application provides a vehicle, the vehicle comprising at least one of the following:

[0038] A charging device as in any one of the embodiments of the second aspect;

[0039] An electronic device as in any one of the embodiments of the third aspect;

[0040] A computer-readable storage medium as in any embodiment of the fourth aspect.

[0041] In the embodiment of the present application, by obtaining the target voltage and its corresponding theoretical SOC during the n+1th charging cycle when the first charging time is greater than the second charging time, the size relationship between the theoretical SOC and the target SOC can be determined, and then it can be determined whether the charging strategy needs to be adjusted according to the above size relationship. By charging the battery in stages with the SOC corresponding to multiple cut-off voltages in the original charging strategy as the cut-off condition in the charging stage after the target voltage when the theoretical SOC is less than the target SOC, relative to always charging the battery in stages with the voltage as the cut-off condition, the charging rate can be reduced at a slower frequency, and the time for charging at a larger charging rate can be extended, so that the charging time of the battery in the n+1th charging cycle can be less than the charging time in the nth charging cycle. In this way, through the embodiment of the present application, the charging time of the battery relative to the previous charging cycle can be reduced, the charging time of the battery can be avoided from getting longer and longer, and the user's experience of the battery can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0043] Figure 1 It is a schematic diagram of cycle data comparison with a voltage value as a cut-off condition in a staged charging process provided by an embodiment of the present application;

[0044] Figure 2 It is a schematic diagram of the change of negative electrode OCV with SOC provided in an embodiment of the present application;

[0045] Figure 3 It is a schematic diagram of a negative electrode impedance changing with the number of battery charging cycles provided in an embodiment of the present application;

[0046] Figure 4 It is a schematic diagram of a lithium precipitation window corresponding to a battery in different states provided in an embodiment of the present application;

[0047] Figure 5 It is a flow chart of a charging method provided in an embodiment of the present application;

[0048] Figure 6 It is a flow chart of another charging method provided in an embodiment of the present application;

[0049] Figure 7 is a structural schematic diagram of a charging device provided in an embodiment of the present application;

[0050] Figure 8It is a structural schematic diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0051] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0052] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present application, rather than all of the embodiments.

[0053] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0054] In the application examples, lithium plating refers to the phenomenon that lithium is deposited on the surface of the negative electrode in the form of a metallic element, rather than being embedded in the negative electrode layers in the form of lithium ions.

[0055] State of Charge (SOC): also known as the remaining capacity, it represents the ratio of the remaining capacity of the battery after it has been used for a period of time or has been left unused for a long time to its capacity in a fully charged state, usually expressed as a percentage.

[0056] Aging coefficient (State of Health, SOH): Battery capacity, health, and performance status are the ratio of the capacity released by the battery when it is discharged from a fully charged state at a certain rate to the cut-off voltage to its corresponding nominal capacity, that is, the ratio of the performance parameters to the nominal parameters after the battery has been used for a period of time. It can be understood as the battery's maximum capacity.

[0057] Charging strategy: The performance parameter table that the battery follows during the charging process consists of three components: temperature, SOC range (voltage range), and charging rate. The charging strategy can characterize the corresponding relationship between temperature, SOC range (voltage range), and charging rate.

[0058] Lithium deposition window: The maximum rate at which a battery can be charged in stages at different temperatures without lithium deposition.

[0059] As described in the background technology section, in the prior art, as the battery ages (the number of battery charging cycles increases), the charging current is usually reduced to avoid lithium plating and ensure the safety of the battery.

[0060] But in fact, if Figure 2 As shown in FIG. 1 , during the charging cycle, the consumption of active lithium will cause the open circuit voltage (OCV) of the negative electrode to increase. Figure 3 As shown, during the charging cycle, the negative electrode plate will continue to expand, thereby significantly reducing the diffusion impedance Rcp of the negative electrode, resulting in a decrease in the negative electrode impedance. That is, during the charging cycle, as the negative electrode OCV increases and the impedance decreases, the rechargeable current of the battery becomes larger. In this way, in fact, as the number of cycles increases, the lithium precipitation window of the battery will increase. For example, by conducting a comprehensive physical examination of the battery at the beginning of its life, namely the BOL (Beginning of Life) test, the lithium precipitation window corresponding to the battery in the BOL state can be determined. By testing the battery at 95% aging coefficient, the lithium precipitation window corresponding to the battery at 95% SOH can be determined. The schematic diagram of the lithium precipitation window corresponding to the battery in different states can be shown as follows Figure 4 shown.

[0061] Based on this, in order to solve the problems of the prior art, the embodiments of the present application provide a charging method, device, equipment, storage medium and vehicle.

[0062] The following first introduces the charging method provided in the embodiment of the present application.

[0063] Figure 5 FIG. 1 is a flow chart of a charging method provided by an embodiment of the present application. Figure 5 As shown, the charging method provided in the embodiment of the present application includes the following steps:

[0064] S510, in the nth charging cycle, obtaining a first charging time for charging the battery from 0% SOC to 100% SOC, where n is a positive integer greater than 1;

[0065] S520, when the first charging time is greater than the second charging time, in the n+1th charging cycle, obtaining a target voltage, where the target voltage is any one of a plurality of charging cut-off voltages defined in the original charging strategy, and the second charging time is the charging time for charging the battery from 0% SOC to 100% SOC in the first charging cycle;

[0066] S530, obtaining a theoretical SOC corresponding to the target voltage;

[0067] S540. When the theoretical SOC is less than the target SOC, in multiple charging stages after the target voltage, the battery is charged in stages using the SOCs corresponding to the multiple charging cutoff voltages in the original charging strategy as charging cutoff conditions. The target SOC is the theoretical SOC corresponding to the target voltage during the first charging cycle.

[0068] The charging method of the embodiment of the present application can determine the size relationship between the theoretical SOC and the target SOC by obtaining the target voltage and its corresponding theoretical SOC during the n+1th charging cycle when the first charging time is greater than the second charging time, and then determine whether the charging strategy needs to be adjusted according to the above size relationship. By charging the battery in stages with the SOC corresponding to multiple cut-off voltages in the original charging strategy as the cut-off condition in the charging stage after the target voltage when the theoretical SOC is less than the target SOC, compared with always charging the battery in stages with the voltage as the cut-off condition, the charging rate can be reduced at a slower frequency, and the time for charging at a larger charging rate can be extended, so that the charging time of the battery in the n+1th charging cycle can be less than the charging time in the nth charging cycle. In this way, through the embodiment of the present application, the charging time of the battery relative to the previous charging cycle can be reduced, the charging time of the battery can be avoided from getting longer and longer, and the user's experience of using the battery can be improved.

[0069] The specific implementation methods of the above steps are introduced below.

[0070] In some embodiments, in S510, the first charging duration may be the charging duration of charging the battery from 0% SOC to 100% SOC according to the original charging strategy during the nth charging cycle. In the original charging strategy, the charging cut-off condition of each charging stage is that the voltage value in the battery reaches the voltage value specified in the charging strategy (i.e., the charging cut-off voltage).

[0071] There may be a corresponding relationship between the number of charging cycles of a battery and the aging state of the battery. That is, during the nth charging cycle, the corresponding aging coefficient of the battery may be X%SOH. In this way, the charging time for charging a battery with X%SOH from 0%SOC to 100%SOC according to the original charging strategy may be the first charging time. In addition, one aging state may correspond to multiple charging cycles. That is, during the n+1th charging cycle, the corresponding aging coefficient of the battery may be X%SOH. In this way, during the n+1th charging cycle, the charging time for charging a battery from 0%SOC to 100%SOC according to the original charging strategy may be the first charging time.

[0072] In some embodiments, in S520, the second charging duration may be the charging duration of charging the battery from 0% SOC to 100% SOC according to the original charging strategy during the first charging cycle, wherein the first charging cycle may correspond to the BOL state (100% SOH) of the battery.

[0073] In addition, on the one hand, the target voltage can be any one of the multiple charging cut-off voltages defined in the original charging strategy. On the other hand, the target voltage can be a voltage obtained by monitoring. That is, during the battery charging process, the battery is continuously monitored, and if the voltage reaches any one of the multiple charging cut-off voltages, the voltage can be determined as the target voltage. If the multiple charging cut-off voltages are recorded as U1, U2, ..., U k , then the target voltage can be recorded as U m . Wherein, k and m are both positive integers. In addition, in the original charging strategy, multiple charging cut-off voltages U1, U2...U k The corresponding charging rates can be recorded as C1, C2...C k .

[0074] As an example, if the first charging time is equal to the second charging time, the battery can continue to be charged according to the original charging strategy during the n+1th charging cycle. If the first charging time is greater than the second charging time, the original charging strategy can be adjusted based on the target voltage to reduce the charging time.

[0075] In some embodiments, in S530, the theoretical SOC corresponding to the target voltage may be an SOC determined based on a charging strategy. It should be noted that during the battery charging process, the voltage and SOC of the battery may be continuously monitored. However, since the battery is usually polarized during the charging process, there is usually a certain gap between the monitored voltage and SOC and the voltage and SOC defined in the charging strategy.

[0076] Based on this, in order to accurately determine the theoretical SOC corresponding to the target voltage, in some embodiments, the above S530 may specifically include:

[0077] Acquire a first voltage corresponding to the target voltage, where the first voltage is a voltage generated by the battery during polarization;

[0078] Calculate the difference between the target voltage and the first voltage to obtain a second voltage, where the second voltage is a voltage of the battery corresponding to the target voltage when the battery is not polarized;

[0079] According to the preset corresponding relationship between the second voltage and the SOC, the SOC corresponding to the second voltage is determined, and a theoretical SOC corresponding to the target voltage is obtained.

[0080] Here, if the target voltage is recorded as U m , then the first voltage can be I m With R m The product of m and R m Specifically, the charging strategy table may include the corresponding relationship between temperature, rate, voltage, and SOC. Since temperature, voltage, and SOC can all be obtained through monitoring, the rate corresponding to the target voltage can be determined. Since there is a one-to-one correspondence between the rate and the current, the I corresponding to the target voltage can be determined. m In addition, the impedance table can include the corresponding relationship between temperature, rate, resistance, and SOC. By searching the impedance table for the impedance corresponding to the above temperature, rate, and SOC, R m . In determining I m and R m Afterwards, we can calculate I m With R m The product of the target voltage and the first voltage is obtained to obtain the first voltage generated by the battery during polarization. By calculating the difference between the target voltage and the first voltage, the second voltage of the battery in the unpolarized state can be obtained. Specifically, if the second voltage is recorded as OCV m , the second voltage OCV can be calculated by the following formula m =U m -I m *R m Since a one-to-one correspondence between the second voltage and the SOC has been preset, after the second voltage is determined, the SOC corresponding to the second voltage can be determined, and then the theoretical SOC corresponding to the target voltage can be obtained.

[0081] In this way, by calculating the second voltage corresponding to the target voltage when the battery is not polarized and determining the SOC corresponding to the second voltage as the theoretical SOC corresponding to the target voltage, the theoretical SOC corresponding to the target voltage can be accurately determined.

[0082] In some embodiments, in S540, the SOCs corresponding to the multiple charge cut-off voltages may be the charge cut-off SOCs. If the battery is not aged, when the battery reaches the target voltage and jumps to the next charging stage, the SOC of the battery may be the SOC corresponding to the target voltage.

[0083] Based on this, if the theoretical SOC is less than the target SOC, it can be determined that the charging capacity of the battery is not fully utilized in the charging stage corresponding to the target voltage. That is, in multiple charging stages after the target voltage, when the charging cut-off voltage is reached and the next charging stage is jumped, the charging cut-off SOC corresponding to the charging cut-off voltage is not reached. Therefore, if the battery is still charged in stages with the voltage as the cut-off condition in multiple charging stages after the target voltage, the charging rate will be reduced at a faster frequency, resulting in a longer time for charging at a smaller charging rate. In fact, in multiple charging stages after the target voltage, for each charging stage, the time to reach the charging cut-off SOC can be greater than the time to reach the charging cut-off voltage. Therefore, in multiple charging stages after the target voltage, charging in stages with SOC as the charging cut-off condition can reduce the charging rate at a slower frequency and extend the time for charging at a larger charging rate, thereby enabling the battery to be charged for the n+1th charging cycle for a shorter charging time than the charging time for the nth charging cycle. That is, if the charging time of the battery in the n+1th charging cycle is recorded as the third charging time, the third charging time may be less than the first charging time, thereby preventing the charging time of the battery from becoming longer and longer and improving the user experience of the battery.

[0084] Based on this, in order to further improve the charging efficiency and reduce the charging time, in some embodiments, the above S540 may specifically include:

[0085] Obtaining a first charging rate corresponding to a target charging stage, where the target charging stage is any one of a plurality of charging stages after a target voltage;

[0086] Increasing the first charging rate to a second charging rate, wherein the second charging rate is not greater than a target lithium precipitation window corresponding to a target charging stage, wherein the target lithium precipitation window represents a maximum rate at which the battery is normally charged during the target charging stage during the n+1th charging cycle;

[0087] The SOC corresponding to the charging cut-off voltage of the target charging stage in the original charging strategy is used as the charging cut-off condition, and the battery is charged at the target charging stage at the second charging rate.

[0088] Here, if Figure 4As shown, different charging stages may correspond to different lithium precipitation windows. The first charging rate may be the charging rate corresponding to the target charging stage in the original charging strategy. That is, in order to reduce the charging time of the battery, not only can the charging be changed to SOC as the cutoff condition in multiple charging stages after the target voltage, but the charging rate corresponding to each charging stage can also be increased at the same time to further improve the charging efficiency and reduce the charging time. It should be noted that in order to avoid the occurrence of lithium precipitation due to the increase in the charging rate, the second charging rate may not be greater than the target lithium precipitation window corresponding to the target charging stage.

[0089] As an example, as described above, during the aging process of the battery from 100% SOH to X% SOH, the lithium precipitation window will be widened. If the widening coefficient of the lithium precipitation window is recorded as a, the battery is in the BOL state (100% SOH), and the lithium precipitation window corresponding to the target charging stage is recorded as d1, and the battery is in X% SOH, and the lithium precipitation window corresponding to the target charging stage is recorded as d2, then the widening coefficient can be: a = (d2-d1) / d1. In this way, increasing the first charging rate to the second charging rate can specifically be increasing the first charging rate by b (1 <b <a) times the original to obtain a second charging rate that is not greater than the target lithium precipitation window.

[0090] In this way, by increasing the first charging rate to the second charging rate in multiple charging stages after the target charging stage reaches the target voltage, the charging efficiency can be further improved and the charging time can be reduced.

[0091] If charging is performed in stages based only on SOC as the cutoff condition, the risk of lithium deposition is relatively high. If charging is performed in stages based only on voltage as the cutoff condition, the charging time will continue to increase as the battery ages, affecting the user experience. Therefore, in order to determine a reasonable charging strategy and improve the user experience, in some embodiments, after the above S530, the following may also be included:

[0092] When the theoretical SOC is not less than the target SOC, the target voltage is increased, and the process returns to acquiring the theoretical SOC corresponding to the target voltage until the theoretical SOC is less than the target SOC.

[0093] Here, if the first charging time is longer than the second charging time, and the theoretical SOC is not less than the target SOC, then in the multiple charging stages after the target voltage corresponding to the theoretical SOC, the staged charging can continue with the voltage as the cutoff condition. At the same time, the value corresponding to the target voltage can be increased, and the above steps can be returned to execute until the theoretical SOC is less than the target SOC. If the theoretical SOC is less than the target SOC, then in the multiple charging stages after the target voltage corresponding to the theoretical SOC, the staged charging can be performed with the SOC as the cutoff condition.

[0094] In this way, by increasing the target voltage when the theoretical SOC is not less than the target SOC until the theoretical SOC is less than the target SOC, a reasonable starting charging stage for staged charging with SOC as the cutoff condition can be determined, and then a reasonable charging strategy can be determined to improve user experience.

[0095] Based on this, in order to ensure that the charging time is stable within a reasonable charging time, avoid the battery charging time becoming longer and longer, and improve the user's battery experience, in some embodiments, after the above S540, the following may also be included:

[0096] Obtain a third charging time, where the third charging time is the charging time for charging the battery from 0% SOC to 100% SOC during the n+1th charging cycle;

[0097] When the third charging time is not greater than the second charging time, in the charging cycle process after the (n+1)th charging cycle, in multiple charging stages after the target voltage, the battery is charged in stages with the SOC as the charging cut-off condition until the number of charging cycles reaches a preset number or the charging time is greater than the second charging time;

[0098] Return to execute to get the target voltage.

[0099] Here, since the third charging duration is the charging duration for charging the battery of X% SOH from 0% SOC to 100% SOC according to the adjusted charging strategy, and the first charging duration is the charging duration for charging the battery of X% SOH from 0% SOC to 100% SOC according to the original charging strategy, the third charging duration may be less than the first charging duration. In addition, since the second charging duration is the charging duration for charging the battery of 100% SOH from 0% SOC to 100% SOC according to the original charging strategy, the third charging duration may be greater than the second charging duration, or may not be greater than the second charging duration.

[0100] As an example, the charging time of the battery can be the same in several adjacent charging cycles. Therefore, if the third charging time is not greater than the second charging time, the battery can be charged in stages according to the above-adjusted charging strategy in the charging cycle process after the n+1th charging cycle, until the number of charging cycles reaches the preset number, and then the charging strategy is readjusted.

[0101] As another example, if the third charging time is not greater than the second charging time, then in the charging cycle after the n+1th charging cycle, the battery can be charged in stages according to the charging strategy after the above adjustment, and the charging time corresponding to each charging completion is recorded. If the charging time is greater than the second charging time, the charging strategy can be readjusted.

[0102] In this way, when the number of charging cycles of charging the battery with the adjusted charging strategy reaches a preset number or the charging time is greater than the second charging time, the charging strategy can be readjusted to ensure that the charging time is stable within a reasonable charging time, thereby avoiding the battery charging time becoming longer and longer, and improving the user's battery experience.

[0103] Based on this, in order to further reduce the charging time and improve the user experience, in some embodiments, after obtaining the third charging time, the following may also be included:

[0104] When the third charging time is greater than the second charging time, during the charging cycle after the (n+1)th charging cycle, the target voltage is reduced, and the process returns to obtain the theoretical SOC corresponding to the target voltage until the third charging time is no greater than the second charging time.

[0105] Here, if the third charging duration is greater than the second charging duration, the charging strategy can be adjusted to further reduce the charging duration. Specifically, if the third charging duration is greater than the second charging duration, the theoretical SOC may be less than the target SOC in the charging stage before the current target voltage. Therefore, during the n+2th charging cycle, the value corresponding to the target voltage can be reduced, and the execution can be returned to obtain the theoretical SOC corresponding to the target voltage. If the third charging duration is still greater than the second charging duration, the value corresponding to the target voltage can be continued to be reduced during the n+3th charging cycle, and the execution can be returned to obtain the theoretical SOC corresponding to the target voltage until the third charging duration is no greater than the second charging duration.

[0106] In this way, by continuing to adjust the charging strategy when the third charging time is longer than the second charging time, the charging time can be further reduced and the user experience can be improved.

[0107] Based on this, in order to ensure the charging safety of the battery, in some embodiments, after the above S540, the following steps may also be included:

[0108] Conduct lithium deposition test on the battery;

[0109] When the battery is in a lithium deposition state, the charging rate corresponding to the lithium deposition state is reduced to restore the battery to a normal state.

[0110] Here, after each adjustment of the charging strategy, during the next charging cycle according to the adjusted charging strategy, the battery can be tested for lithium deposition to determine whether a lithium deposition signal is generated. In the case where the battery generates a lithium deposition signal, the charging rate corresponding to the lithium deposition state can be reduced to reduce the charging current and restore the battery to a normal state. Among them, the lithium deposition detection of the battery can specifically be an impedance test of the battery, and when the degree of impedance drop is greater than a preset threshold, it is determined that the battery is in a lithium deposition state. If the battery does not generate a lithium deposition signal, it can be determined that the adjusted charging strategy is a feasible charging strategy.

[0111] In this way, by performing lithium deposition detection on the battery, when the battery is in a lithium deposition state, the charging rate corresponding to the lithium deposition state is reduced, thereby ensuring the charging safety of the battery.

[0112] Based on this, in order to better describe the entire solution, some specific examples are given based on the above embodiments.

[0113] For example, Figure 6 As shown, the embodiment of the present application provides a charging method which may include the following steps:

[0114] S61, obtaining a first charging duration for charging the battery with X% SOH in stages according to the original charging strategy;

[0115] S62, determining whether the first charging time is greater than the second charging time, if so, executing S64, if not, executing S63;

[0116] S63, continue to charge the battery with X% SOH in stages according to the original charging strategy;

[0117] S64, extract X% SOH of the battery during charging, each C1, C2...C k The corresponding voltages U1, U2, ... U k ;

[0118] S65, from U1, U2...U k Choose a voltage U m , and get the U m Corresponding theoretical SOC m ;

[0119] S66, in U m The voltage jump strategy is adopted in the charging stage before U m In the subsequent charging stage, the SOC jump strategy is adopted, and the charging rate is increased by b (1 < b < a) times of the original, and the third charging time is obtained;

[0120] S67, determining whether the third charging time is greater than the second charging time, if so, executing S68, if not, executing S69;

[0121] S68, reduce U m ;

[0122] S69, during the next charging cycle, performing lithium deposition detection on the battery;

[0123] S610, determining whether a lithium deposition signal is generated, if so, executing S611, if not, executing S612;

[0124] S611, reduce b;

[0125] S612: Determine that the adjusted charging strategy is a feasible charging strategy.

[0126] Therefore, by combining the changing characteristics of the charging window (lithium precipitation window) during the aging process of the battery (battery cell) and the application of the charging strategy, that is, by adjusting the charging cut-off condition in the later stage of the cycle, the SOC cut-off is adopted instead of the voltage cut-off in the second half of the SOC, and the charging rate is increased according to the widening coefficient of the charging window after the aging of the battery cell, so as to achieve the purpose of not reducing the charging speed of the battery or even improving the charging speed. In addition, in order to avoid the risk of overcharging and lithium precipitation of the battery due to inaccurate SOC control, the charging strategy can be adjusted in real time by performing lithium precipitation detection on the battery to avoid lithium precipitation. In this way, through the embodiments of the present application, the charging capacity of the battery can be fully utilized, the charging speed during the cycle can be improved, and the user experience can be improved.

[0127] Based on the charging method provided in the above embodiment, the present application also provides a specific implementation of the charging device. Please refer to the following embodiment.

[0128] like Figure 7 As shown, the charging device 700 provided in the embodiment of the present application includes the following modules:

[0129] A first acquisition module 710 is used to acquire a first charging time duration of charging the battery from 0% SOC to 100% SOC during an nth charging cycle, where n is a positive integer greater than 1;

[0130] A second acquisition module 720 is used to acquire a target voltage during the n+1th charging cycle when the first charging time is greater than the second charging time, where the target voltage is any one of a plurality of charging cut-off voltages defined in the original charging strategy, and the second charging time is the charging time for charging the battery from 0% SOC to 100% SOC during the first charging cycle;

[0131] A third acquisition module 730 is used to acquire a theoretical SOC corresponding to a target voltage;

[0132] The first charging module 740 is used to charge the battery in stages in multiple charging stages after the target voltage when the theoretical SOC is less than the target SOC, using the SOCs corresponding to the multiple charging cut-off voltages in the original charging strategy as charging cut-off conditions, and the target SOC is the theoretical SOC corresponding to the target voltage during the first charging cycle.

[0133] The above charging device 700 is described in detail below, as shown below:

[0134] In some embodiments, the charging device 700 may further include:

[0135] The increasing module is used to increase the target voltage after obtaining the theoretical SOC corresponding to the target voltage, if the theoretical SOC is not less than the target SOC, and return to execute the acquisition of the theoretical SOC corresponding to the target voltage until the theoretical SOC is less than the target SOC.

[0136] In some embodiments, the charging device 700 may further include:

[0137] A fourth acquisition module is used to acquire a third charging duration after charging the battery in stages using the SOCs corresponding to the multiple charging cut-off voltages in the original charging strategy as charging cut-off conditions, the third charging duration being the charging duration for charging the battery from 0% SOC to 100% SOC during the n+1th charging cycle;

[0138] a second charging module, for charging the battery in stages in a plurality of charging stages after a target voltage, taking the SOC as a charging cut-off condition, in a case where the third charging time is not greater than the second charging time, during a charging cycle after the n+1th charging cycle, until the number of charging cycles reaches a preset number or the charging time is greater than the second charging time;

[0139] The execution module is used to return and execute to obtain the target voltage.

[0140] In some embodiments, the charging device 700 may further include:

[0141] The first reduction module is used to reduce the target voltage during the charging cycle after the (n+1)th charging cycle after obtaining the third charging time and return to execute to obtain the theoretical SOC corresponding to the target voltage until the third charging time is not greater than the second charging time.

[0142] In some embodiments, the first charging module 740 may specifically include:

[0143] A first acquisition submodule, used to acquire a first charging rate corresponding to a target charging stage, where the target charging stage is any one of a plurality of charging stages after a target voltage;

[0144] An increasing submodule, used to increase the first charging rate to a second charging rate, the second charging rate is not greater than a target lithium precipitation window corresponding to a target charging stage, the target lithium precipitation window represents a maximum rate at which the battery is normally charged in the target charging stage during the n+1th charging cycle;

[0145] The charging submodule is used to use the SOC corresponding to the charging cut-off voltage of the target charging stage in the original charging strategy as the charging cut-off condition, and to charge the battery at the target charging stage at a second charging rate.

[0146] In some embodiments, the charging device 700 may further include:

[0147] A detection module is used to perform lithium deposition detection on the battery after charging the battery in stages in multiple charging stages after the target voltage, using the SOCs corresponding to the multiple charging cut-off voltages in the original charging strategy as charging cut-off conditions;

[0148] The second reducing module is used to reduce the charging rate corresponding to the lithium deposition state when the battery is in the lithium deposition state, so as to restore the battery to a normal state.

[0149] In some embodiments, the third acquisition module 730 may specifically include:

[0150] A second acquisition submodule, used to acquire a first voltage corresponding to the target voltage, where the first voltage is a voltage generated by the battery during polarization;

[0151] A calculation submodule, used for calculating the difference between the target voltage and the first voltage to obtain a second voltage, where the second voltage is a voltage corresponding to the target voltage when the battery is not polarized;

[0152] The determination submodule is used to determine the SOC corresponding to the second voltage according to the corresponding relationship between the preset second voltage and the SOC, and obtain the theoretical SOC corresponding to the target voltage.

[0153] The charging device of the embodiment of the present application can determine the size relationship between the theoretical SOC and the target SOC by obtaining the target voltage and its corresponding theoretical SOC during the n+1th charging cycle when the first charging time is greater than the second charging time, and then determine whether the charging strategy needs to be adjusted according to the above size relationship. By charging the battery in stages with the SOC corresponding to multiple cut-off voltages in the original charging strategy as the cut-off condition in the charging stage after the target voltage when the theoretical SOC is less than the target SOC, compared with always charging the battery in stages with the voltage as the cut-off condition, the charging rate can be reduced at a slower frequency, and the time for charging at a larger charging rate can be extended, so that the charging time of the battery in the n+1th charging cycle can be less than the charging time in the nth charging cycle. In this way, through the embodiment of the present application, the charging time of the battery relative to the previous charging cycle can be reduced, the charging time of the battery can be avoided from getting longer and longer, and the user's experience of using the battery can be improved.

[0154] Based on the charging method provided in the above embodiment, the embodiment of the present application also provides a specific implementation of the electronic device. Figure 8 A schematic diagram of an electronic device 800 provided in an embodiment of the present application is shown.

[0155] The electronic device 800 may include a processor 810 and a memory 820 storing computer program instructions.

[0156] Specifically, the processor 810 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.

[0157] The memory 820 may include a large capacity memory for data or instructions. By way of example and not limitation, the memory 820 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. In appropriate cases, the memory 820 may include a removable or non-removable (or fixed) medium. In appropriate cases, the memory 820 may be inside or outside the integrated gateway disaster recovery device. In a specific embodiment, the memory 820 is a non-volatile solid-state memory.

[0158] The memory may include a read-only memory (ROM), a random access memory (RAM), a magnetic disk storage medium device, an optical storage medium device, a flash memory device, an electrical, optical or other physical / tangible memory storage device. Thus, typically, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., a memory device) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the method according to the first aspect of the present application.

[0159] The processor 810 implements any one of the charging methods in the above embodiments by reading and executing computer program instructions stored in the memory 820 .

[0160] In one example, the electronic device 800 may further include a communication interface 830 and a bus 840. Figure 8 As shown, the processor 810, the memory 820, and the communication interface 830 are connected via a bus 840 and communicate with each other.

[0161] The communication interface 830 is mainly used to implement communication between various modules, devices, units and / or equipment in the embodiments of the present application.

[0162] Bus 840 includes hardware, software or both, and the parts of electronic equipment are coupled to each other. For example, but not limitation, bus may include accelerated graphics port (AGP) or other graphics bus, enhanced industrial standard architecture (EISA) bus, front side bus (FSB), hypertransport (HT) interconnection, industrial standard architecture (ISA) bus, infinite bandwidth interconnection, low pin count (LPC) bus, memory bus, micro channel architecture (MCA) bus, peripheral component interconnection (PCI) bus, PCI-Express (PCI-X) bus, serial advanced technology attachment (SATA) bus, video electronics standard association local (VLB) bus or other suitable bus or two or more of these combinations. In appropriate cases, bus 840 may include one or more buses. Although the present application embodiment describes and shows a specific bus, the application considers any suitable bus or interconnection.

[0163] Exemplarily, the electronic device 800 may be a mobile phone, a tablet computer, a laptop computer, a PDA, an in-vehicle electronic device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA).

[0164] The electronic device can execute the charging method in the embodiment of the present application, thereby realizing the combination Figures 5 to 7 The charging method and device described.

[0165] In addition, in combination with the charging method in the above embodiment, the embodiment of the present application can provide a computer-readable storage medium for implementation. The computer-readable storage medium stores computer program instructions; when the computer program instructions are executed by a processor, any one of the charging methods in the above embodiment is implemented.

[0166] In addition, the embodiment of the present application further provides a vehicle, which may include at least one of the following:

[0167] A charging device as in any one of the embodiments of the second aspect;

[0168] An electronic device as in any one of the embodiments of the third aspect;

[0169] The computer-readable storage medium in any one of the embodiments of the fourth aspect will not be described in detail here.

[0170] It should be clear that the present application is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present application.

[0171] The functional blocks shown in the above-described block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present application are programs or code segments that are used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0172] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

[0173] The above reference is according to the method of the embodiment of the present application, the flow chart of the device (system) and the computer program product and / or the block diagram described various aspects of the present application.It should be understood that each square box in the flow chart and / or the block diagram and the combination of each square box in the flow chart and / or the block diagram can be realized by computer program instructions.These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer or other programmable data processing device to produce a machine so that these instructions executed by the processor of the computer or other programmable data processing device enable the realization of the function / action specified in one or more square boxes of the flow chart and / or the block diagram.Such a processor can be but is not limited to a general-purpose processor, a special-purpose processor, a special application processor or a field programmable logic circuit.It can also be understood that each square box in the block diagram and / or the flow chart and the combination of the square boxes in the block diagram and / or the flow chart can also be realized by the dedicated hardware that performs the specified function or action, or can be realized by the combination of dedicated hardware and computer instructions.

[0174] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A charging method, characterized in that: include: During the nth charging cycle, obtaining a first charging time of charging the battery from 0% SOC to 100% SOC, where n is a positive integer greater than 1; When the first charging time is greater than the second charging time, during the n+1th charging cycle, a target voltage is obtained, where the target voltage is any one of a plurality of charging cut-off voltages defined in the original charging strategy, and the second charging time is the charging time for charging the battery from 0% SOC to 100% SOC during the first charging cycle; Obtaining a theoretical SOC corresponding to the target voltage; When the theoretical SOC is less than the target SOC, in multiple charging stages after the target voltage, the battery is charged in stages using the SOCs corresponding to the multiple charging cut-off voltages in the original charging strategy as charging cut-off conditions, and the target SOC is the theoretical SOC corresponding to the target voltage during the first charging cycle.

2. The method according to claim 1, characterized in that: After obtaining the theoretical SOC corresponding to the target voltage, the method further includes: When the theoretical SOC is not less than the target SOC, the target voltage is increased, and the step of obtaining the theoretical SOC corresponding to the target voltage is returned to execution until the theoretical SOC is less than the target SOC.

3. The method according to claim 1, characterized in that After charging the battery in stages by using the SOCs corresponding to the multiple charging cut-off voltages in the original charging strategy as charging cut-off conditions, the method further includes: Obtaining a third charging duration, where the third charging duration is a charging duration for charging the battery from 0% SOC to 100% SOC during the n+1th charging cycle; When the third charging time is not greater than the second charging time, in the charging cycle after the n+1th charging cycle, the battery is charged in stages with the SOC as the charging cut-off condition in multiple charging stages after the target voltage, until the number of charging cycles reaches a preset number or the charging time is greater than the second charging time; Return to execute the step of obtaining the target voltage.

4. The method according to claim 3, characterized in that After obtaining the third charging duration, the method further includes: When the third charging time is greater than the second charging time, during the charging cycle after the n+1th charging cycle, the target voltage is reduced, and the process of obtaining the theoretical SOC corresponding to the target voltage is returned to execution until the third charging time is no greater than the second charging time.

5. The method according to claim 1, characterized in that The multiple charging stages after the target voltage, charging the battery in stages using the SOCs corresponding to the multiple charging cut-off voltages in the original charging strategy as charging cut-off conditions, include: Acquire a first charging rate corresponding to a target charging stage, wherein the target charging stage is any one of a plurality of charging stages after the target voltage; Increasing the first charging rate to a second charging rate, wherein the second charging rate is no greater than a target lithium precipitation window corresponding to the target charging stage, wherein the target lithium precipitation window represents a maximum rate at which the battery is normally charged during the target charging stage during the n+1th charging cycle; The SOC corresponding to the charging cut-off voltage of the target charging stage in the original charging strategy is used as a charging cut-off condition, and the battery is charged at the target charging stage at the second charging rate.

6. The method according to claim 1 or 5, characterized in that: After charging the battery in stages in the multiple charging stages after the target voltage using the SOCs corresponding to the multiple charging cut-off voltages in the original charging strategy as charging cut-off conditions, the method further includes: Performing lithium deposition detection on the battery; When the battery is in a lithium deposition state, the charging rate corresponding to the lithium deposition state is reduced to restore the battery to a normal state.

7. The method according to claim 1, characterized in that The obtaining of a theoretical SOC corresponding to the target voltage includes: Acquire a first voltage corresponding to the target voltage, where the first voltage is a voltage generated by the battery during polarization; Calculating a difference between the target voltage and the first voltage to obtain a second voltage, where the second voltage is a voltage of the battery corresponding to the target voltage when the battery is not polarized; According to the corresponding relationship between the preset second voltage and the SOC, the SOC corresponding to the second voltage is determined, and a theoretical SOC corresponding to the target voltage is obtained.

8. A charging device, characterized in that: The device comprises: A first acquisition module, used for acquiring a first charging time length of the battery from 0% SOC to 100% SOC during an nth charging cycle, where n is a positive integer greater than 1; A second acquisition module is used to acquire a target voltage during the n+1th charging cycle when the first charging time is greater than the second charging time, wherein the target voltage is any one of a plurality of charging cut-off voltages defined in the original charging strategy, and the second charging time is the charging time for charging the battery from 0% SOC to 100% SOC during the first charging cycle; A third acquisition module, used to acquire a theoretical SOC corresponding to the target voltage; The first charging module is used to charge the battery in stages in a plurality of charging stages after the target voltage, using the SOCs corresponding to the plurality of charging cut-off voltages in the original charging strategy as charging cut-off conditions when the theoretical SOC is less than the target SOC, and the target SOC is the theoretical SOC corresponding to the target voltage during the first charging cycle.

9. An electronic device, characterized in that: The electronic device comprises: a processor and a memory storing computer program instructions; When the processor executes the computer program instructions, the charging method according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer program instructions, and when the computer program instructions are executed by a processor, the charging method according to any one of claims 1 to 7 is implemented.

11. A vehicle, characterized in that: Include at least one of the following: The charging device as claimed in claim 8; The electronic device as claimed in claim 9; The computer readable storage medium of claim 10.

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