Battery charging method and device

Abstract

The embodiment of the invention provides a battery charging method and device, and the method comprises the steps: obtaining the connection of an external adapter, and obtaining a first target parameter, the first target parameter at least comprises parameter information of the battery; a target charging strategy is determined based on the first target parameter; a configuration parameter of the target charging strategy is determined based on a second target parameter; charging for the battery is controlled based on the target charging strategy; wherein the configuration parameters of the target charging strategy comprise a voltage parameter used for controlling to stop charging, which is lower than a voltage parameter used for controlling to stop charging, of an original charging strategy, or a current parameter used for controlling to stop charging, which is higher than a current parameter used for controlling to stop charging, of the original charging strategy.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of battery aging, and more particularly to a battery charging method and device. Background Art

[0002] Lithium-ion batteries are widely used in electric vehicles and consumer electronics. During the normal life cycle, lithium batteries will age due to charge and discharge cycles. In addition, long-term storage of lithium batteries will also cause calendar aging. The capacity decay caused by cell aging limits the service life of the cell. When the cell capacity is lower than a certain standard (such as 80% of the initial capacity), the cell reaches the end of its life cycle. How to extend the service life of the cell can be achieved through material doping and coating during the design process of the cell. During the use of the cell, the use of a suitable charging method can also slow down the aging rate of the cell to a certain extent.

[0003] The existing solutions to this technical problem include:

[0004] Solution 1: During the use of the battery cell, the common method to slow down the aging of lithium batteries is to reduce the charging rate;

[0005] The disadvantage of this solution is that reducing the charging rate will significantly extend the charging time (extended time >10%).

[0006] Solution 2: Limit the battery’s state of charge (SOC) range to 20%-80%

[0007] The disadvantage of this solution is that limiting the battery charge and discharge SOC range will cause the battery's discharge capacity to drop significantly, failing to meet the specified battery attenuation target, and the battery energy utilization efficiency will also drop. Summary of the invention

[0008] The present application embodiment provides a battery charging method, including:

[0009] Get the connection of the external adapter;

[0010] Obtaining a first target parameter, wherein the first target parameter at least includes parameter information of a battery;

[0011] determining a target charging strategy based on the first target parameter;

[0012] Determining configuration parameters of the target charging strategy based on the second target parameter;

[0013] Controlling charging of the battery based on the target charging strategy;

[0014] The configuration parameters of the target charging strategy include at least one of the following:

[0015] The voltage parameter for controlling charging to stop included in the configuration parameters of the target charging strategy is lower than the voltage parameter for controlling charging to stop in the original charging strategy, or;

[0016] The current parameter for controlling charging to stop included in the configuration parameters of the target charging strategy is higher than the current parameter for controlling charging to stop of the original charging strategy.

[0017] In some embodiments, the first target parameter is different, and the voltage parameter or current parameter included in the configuration parameter for controlling charging stop is different;

[0018] The first target parameter and the second target parameter are obtained based on the connection of the external adapter, and the first target parameter is partially identical to the second target parameter.

[0019] In some embodiments, determining the configuration parameters of the target charging strategy based on the second target parameter includes:

[0020] The configuration parameter is obtained by processing the second target parameter based on a target model, wherein the target model corresponds to the battery.

[0021] In some embodiments, the second target parameter includes the number of charge and discharge cycles;

[0022] The step of processing the second target parameter based on the target model to obtain the configuration parameter includes:

[0023] Based on the target model, query in a first configuration table to determine a standard charging capacity corresponding to the number of charge and discharge cycles, where different numbers of charge and discharge cycles correspond to different standard charging capacities, and the first configuration table corresponds to the battery;

[0024] Processing the standard charging capacity based on the target model to obtain a target charging capacity corresponding to this charging;

[0025] The first open circuit potential corresponding to the target charging capacity is determined by querying the second configuration table based on the target model, and different target charging capacities correspond to different first open circuit potentials.

[0026] In some embodiments, the second target parameter includes a current value and a voltage value currently output by the battery;

[0027] The step of processing the second target parameter based on the target model to obtain the configuration parameter includes:

[0028] The current value and the voltage value are processed based on the target model to obtain a first resistance value.

[0029] In some embodiments, the second target parameter includes a voltage parameter or a current parameter in the original charging strategy;

[0030] The step of processing the second target parameter based on the target model to obtain the configuration parameter includes:

[0031] Processing the current parameter, the first open circuit potential and the first resistance in the original charging strategy based on the target model, and calculating and determining candidate voltage parameters corresponding to the current charging process; or

[0032] The voltage parameter, the first open circuit potential and the first resistance value in the original charging strategy are processed based on the target model to calculate and determine candidate current parameters corresponding to the current charging process.

[0033] In some embodiments, the second target parameter includes a charging cut-off voltage used in the current battery charging process;

[0034] The method further comprises:

[0035] The candidate current parameter is compared with the current parameter, or the candidate voltage parameter is compared with the voltage parameter based on the target model, and based on the comparison result, the current parameter corresponding to the smaller one or the voltage parameter corresponding to the larger one is used as the configuration parameter.

[0036] In some embodiments, the method further comprises:

[0037] When the capacity difference between the target charging capacity and the standard charging capacity meets a condition, at least dividing the constant voltage charging stage of the battery into a plurality of sub-stages;

[0038] Determining a sub-target charging capacity of the sub-stage;

[0039] determining a second open circuit potential of the battery based on the sub-target charging capacity;

[0040] Adjusting an initial cut-off voltage or an initial cut-off current of the battery in a corresponding charging sub-stage based on the second open-circuit potential and the first resistance value;

[0041] The charging of the battery in the corresponding charging sub-stage is controlled based on the adjusted cut-off voltage or cut-off current, so that the battery automatically enters the next sub-stage to continue charging when it is charged to have a sub-target charging capacity.

[0042] In some embodiments, determining the target charging strategy according to the first target parameter includes:

[0043] If the first target parameter meets the target condition, determining to use the target charging strategy to complete the charging of the battery this time;

[0044] If the first target parameter does not meet the target condition, it is determined to use the original charging strategy to complete the charging of the battery this time.

[0045] Another embodiment of the present application also provides a battery charging device, including:

[0046] A first obtaining module, used to obtain a connection of an external adapter;

[0047] A second obtaining module, used to obtain a first target parameter, where the first target parameter at least includes parameter information of a battery;

[0048] A first determination module, configured to determine a target charging strategy according to a first target parameter;

[0049] A second determination module, configured to determine configuration parameters of the target charging strategy according to a second target parameter;

[0050] A control module, configured to control charging of the battery according to the target charging strategy;

[0051] The configuration parameters of the target charging strategy include at least one of the following:

[0052] The voltage parameter for controlling charging to stop included in the configuration parameters of the target charging strategy is lower than the voltage parameter for controlling charging to stop in the original charging strategy, or;

[0053] The current parameter for controlling charging to stop included in the configuration parameters of the target charging strategy is higher than the current parameter for controlling charging to stop of the original charging strategy.

[0054] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings.

[0055] The technical solution of the present application is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0057] Figure 1 It is a flowchart of the battery charging method in the embodiment of the present application.

[0058] Figure 2 It is a flowchart diagram of a battery charging method in another embodiment of the present application.

[0059] Figure 3 It is a flowchart diagram of a battery charging method in another embodiment of the present application.

[0060] Figure 4 is a structural block diagram of a battery charging device in an embodiment of the present application. DETAILED DESCRIPTION

[0061] Below, specific embodiments of the present application are described in detail with reference to the accompanying drawings, but are not intended to limit the present application.

[0062] It should be understood that various modifications may be made to the embodiments disclosed herein. Therefore, the following description should not be considered as limiting, but merely as an example of an embodiment. Other modifications within the scope and spirit of the present disclosure will occur to those skilled in the art.

[0063] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the general description of the present disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the present disclosure.

[0064] These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0065] It should also be understood that, although the present application has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the present application that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0066] The above and other aspects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0067] Specific embodiments of the present disclosure are described hereinafter with reference to the accompanying drawings; however, it should be understood that the disclosed embodiments are merely examples of the present disclosure, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant details. Therefore, the specific structural and functional details disclosed herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present disclosure in a variety of ways with substantially any suitable detailed structure.

[0068] This specification may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present disclosure.

[0069] Below, embodiments of the present application are described in detail with reference to the accompanying drawings.

[0070] like Figure 1 As shown, an embodiment of the present application provides a battery charging method, comprising:

[0071] S1: Get the connection of the external adapter;

[0072] S2: Obtaining a first target parameter, where the first target parameter at least includes parameter information of a battery;

[0073] S3: Determine a target charging strategy based on the first target parameter;

[0074] S4: Determining configuration parameters of the target charging strategy based on the second target parameter;

[0075] S5: controlling charging of the battery based on the target charging strategy;

[0076] The configuration parameters of the target charging strategy include at least one of the following:

[0077] The voltage parameter for controlling charging to stop included in the configuration parameters of the target charging strategy is lower than the voltage parameter for controlling charging to stop in the original charging strategy, or;

[0078] The current parameter for controlling charging to stop included in the configuration parameters of the target charging strategy is higher than the current parameter for controlling charging to stop of the original charging strategy.

[0079] The battery is installed in an electronic device, and the type of the electronic device is uncertain, for example, it can be but not limited to a mobile phone, a laptop computer, a tablet computer, a learning machine, etc. When the electronic device is charging, it will be connected to an external power source through an adapter. When the adapter is connected, an access signal will be obtained. Based on the signal, it can be determined that the battery in the device is connected to the adapter, that is, the external power source is connected, and charging starts. At this time, the internal system of the battery or the device system will obtain a first target parameter, and the first target parameter includes the parameter information of the battery, and can also include other parameters, such as environmental parameters, specifically temperature parameters, etc. Based on the first target parameter, the charging strategy adapted to the current battery can be determined in the existing different charging strategies, that is, the charging strategies corresponding to different first target parameters may be different, or of course, they may be the same. Different first target parameters represent different battery parameters, and batteries under different parameters may encounter different problems when they are charged. Therefore, it is particularly important to select a charging strategy adapted to the current state to ensure the charging effect and protect the battery life at the same time. For example, when some first target parameters represent that the battery is in the first state, a new default charging strategy different from the configuration is needed to complete the charging, so as to achieve the above charging effect. When other first target parameters characterize that the battery is in the second state, it is necessary to use the original charging strategy with the default configuration to complete the charging. Specifically, when charging using the target charging strategy, it is necessary to reconfigure the parameters used for charging. At this time, the system will obtain the second target parameter and calculate the configuration parameters of the target charging strategy based on the second target parameter. The configuration parameters are used to complete the target charging strategy. When determining the target charging strategy based on the first target parameter, it is determined to perform charging using a mode of charging with the target charging strategy, but the specific configuration parameters of the strategy are not fixed, but need to be calculated in combination with the second target parameter to obtain. The second target parameter also includes battery parameter information, but the second target parameter is different from the battery parameter information contained in the first target parameter. In this embodiment, the second target parameter may include the battery parameter information contained in the first target parameter. The configuration parameters calculated and determined based on the second target parameter include voltage parameters and current parameters. The voltage parameter includes a cut-off voltage parameter for controlling the stop of charging, and the current parameter includes a cut-off current parameter for controlling the stop of charging.

[0080] Among them, the cut-off voltage parameter calculated and determined in the target charging strategy is smaller than the cut-off voltage parameter in the default configuration charging strategy, and the cut-off current parameter calculated and determined in the target charging strategy is larger than the cut-off current parameter in the default configuration charging strategy. When the target charging strategy is configured, the system will control the charging of the battery based on the configured target charging strategy, so that this charging will not have adverse effects on the battery, and will not make the cathode potential of the battery too high, which will greatly accelerate the aging of the battery cell.

[0081] Based on the above content, it can be known that the scheme adjusts the cutoff conditions of the standard constant current and constant voltage charging process of the battery to reduce the maximum potential of the battery cathode during the charging process while meeting the needs of the available capacity of the battery cell, thereby achieving the purpose of slowing down the aging rate of the battery cell. The battery in this embodiment is a chemical system in which the cathode dominates the battery aging, including but not limited to lithium cobalt oxide-graphite, nickel cobalt manganese oxide-graphite, nickel cobalt aluminum oxide-graphite and other systems. In these systems, the loss of cathode material dominates the aging of the battery cell, and the maximum potential of the cathode directly affects the loss rate of the cathode material.

[0082] For example, the voltage of the above-mentioned battery is equal to the difference between the cathode potential and the anode potential. During the charging process, the battery voltage and cathode potential continue to rise, where the cathode potential CP (Cathode Potent ial) is equal to the sum of the cathode equilibrium potential (Open C i rcu it Potent ial) and the cathode polarization voltage (η): CP = PCP + η. Among them, OCP is an intrinsic property of the material, which is related to the lithium content inside the material and is a fixed value. Cathode polarization is equal to the product of the charging current and the cathode impedance, η = I × rcc (cathode). During the charging process, CP continues to rise and is the largest when the battery is in a fully charged state. High CP will cause damage to the cathode structure and oxidation of the electrolyte, accelerating the decay of the battery cell. Therefore, the scheme of this embodiment adjusts the actual charging capacity of the battery by changing the values ​​of the cut-off current and the cut-off voltage to avoid the battery from being fully charged, so as to avoid the cathode potential value being too high to the extent that it will aggravate the aging of the battery cell. That is, the effect of slowing down the aging speed of the battery cell is achieved by lowering the maximum value of the cathode potential.

[0083] Based on the above content, it can be known that the scheme of this embodiment is to adjust the cut-off voltage or cut-off current that controls the stop charging by sacrificing some charging capacity, so that the charging process ends early, and the value of the cathode potential of the battery corresponding to the end time is preferably at the critical value that enters the aggravation speed of the battery cell, that is, in the numerical range of the cathode potential that will not aggravate the aging speed of the battery cell, and the cathode potential corresponding to the end time is preferably the maximum value in the numerical range. Through the above scheme, not only the charging speed can be guaranteed without reducing the charging speed, but also the charging capacity will not decrease significantly, but it can meet the various regulations of electronic equipment, and at the same time meet the user's demand for the battery usage time, and can effectively protect the battery cell, greatly slow down the aging speed of the battery cell, and extend the service life of the battery.

[0084] Since the first target parameter is a determined charging strategy, including the target charging strategy and the original charging strategy, and the configuration parameters of the target charging strategy and the original charging strategy must be different, in this embodiment, the first target parameter is different, and the voltage parameter or current parameter included in the configuration parameter for controlling the stop charging is also different. The first target parameter and the second target parameter in this embodiment are both obtained based on the connection between the device and the external adapter. The first target parameter is partially the same as the second target parameter. As described above, some of the battery parameters included can be the same, and even the battery parameter information in the second target parameter can cover the battery parameter information included in the first target parameter.

[0085] In one embodiment, if Figure 2 As shown, determining the target charging strategy according to the first target parameter includes:

[0086] S6: If the first target parameter meets the target condition, determine to use the target charging strategy to complete the charging of the battery this time;

[0087] S7: If the first target parameter does not meet the target condition, determine to use the original charging strategy to complete the charging of the battery this time.

[0088] Exemplarily, the first target parameter in this embodiment includes the cumulative number of charge and discharge times of the battery corresponding to this charging, and one charge and discharge includes one complete charge and one complete discharge process. The cumulative number of charge and discharge times of the battery refers to the number of complete charge and discharge times performed so far. When the number is measured in laps, the cumulative number of charge and discharge times of the battery is, for example, the 200th lap, i.e., the second 200th charge and discharge, and the 600th lap, i.e., the 600th charge and discharge. After the first target parameter is obtained by connecting the device to the adapter, the system will determine the number of charge and discharge times corresponding to the current time based on the first target parameter, and compare and match the parameter with the preset target condition. If the parameter meets the target condition, the target charging strategy is adopted to complete this charging, and if the target condition is not met, the original charging strategy is adopted to complete this charging. The target condition may be a threshold value of the number of charge and discharge times. For example, if the number of charge and discharge times is within a threshold range, it may indicate that the charging parameters in the original charging strategy can meet the purpose of preventing accelerated battery aging, so no adjustment is required and the battery may be used directly. However, if the number of charge and discharge times is outside the threshold range, it indicates that when the charge and discharge control is performed based on the charging parameters in the original charging strategy, battery aging will be accelerated, so the configuration parameters need to be adjusted. In this case, the target charging strategy needs to be adopted to complete the current charging control.

[0089] Of course, the first target parameter may include not only the number of charge and discharge times, but also, but not limited to, the temperature, voltage and other parameter information of the battery. In order to improve the judgment accuracy of the charging strategy selection, the system can also analyze and judge which charging strategy is suitable for the current state of the battery in combination with the current temperature and voltage of the battery. If the temperature is too high and the number of charge and discharge times is close to the maximum value in the threshold range, the target charging strategy is adopted. Alternatively, the system can also determine the charging strategy in combination with the health status of the battery, for example, estimating the health status of the battery based on the statistical duration of device use and the charge and discharge status of the battery each time. If the health status does not meet the requirements, the target charging strategy is given priority. If the health status meets the requirements, the original charging strategy is considered. When determining the health status of the battery, it can be comprehensively determined by combining the temperature of the battery, the cumulative number of charge and discharge times of the battery, the current internal resistance of the battery (i.e., the first resistance below), and the difference between the current full charge capacity of the battery and the full charge capacity at the time of leaving the factory. If the temperature meets the temperature threshold, the internal resistance meets the internal resistance threshold, the cumulative number of charge and discharge times meets the threshold range, and the capacity difference calculated above also meets the corresponding threshold, it can be determined that the current health state of the battery is poor. In order to protect the battery, it is preferred to adopt the target charging strategy at this time. If the battery is in good health, the original charging strategy can be adopted. For another example, if the current battery temperature is suitable, but the other parameters do not meet the requirements, it can be directly determined to adopt the target charging strategy at this time. If the current battery temperature, internal resistance, and capacity difference all meet the requirements, only the cumulative number of charge and discharge times does not meet the requirements, it can be said that the battery is in good condition and there is no need to adopt the target charging strategy. The original charging strategy can be used.

[0090] In another embodiment, determining the configuration parameters of the target charging strategy based on the second target parameter includes:

[0091] S8: Processing the second target parameter based on a target model to obtain the configuration parameter, wherein the target model corresponds to the battery.

[0092] For example, a target model can be pre-trained, and the obtained second target parameters can be processed based on the model to quickly obtain the required configuration parameters. The target model described in this embodiment corresponds to the battery, that is, different batteries have different target models, including different parameters involved in the target model, such as different weights. Therefore, corresponding to different batteries, the configuration parameters calculated by different target models will also be different.

[0093] In this embodiment, the second target parameter also includes the current number of charge and discharge cycles of the battery;

[0094] Accordingly, the step of processing the second target parameter based on the target model to obtain the configuration parameter includes:

[0095] S9: Based on the target model, query and determine the standard charging capacity corresponding to the number of charge and discharge cycles in the first configuration table, where different numbers of charge and discharge cycles correspond to different standard charging capacities, and the first configuration table corresponds to the battery;

[0096] S10: Processing the standard charging capacity based on the target model to obtain a target charging capacity corresponding to this charging;

[0097] S11: Based on the target model, query and determine the first open circuit potential corresponding to the target charging capacity in the second configuration table, and different target charging capacities correspond to different first open circuit potentials.

[0098] Exemplarily, a first configuration table is pre-set, in which the standard charging capacity corresponding to different charge and discharge cycles is recorded. With the normal attenuation phenomenon that occurs during the use of the battery, as the number of charge and discharge increases, the corresponding standard charging capacity is different, and the standard charging capacity is the full charge capacity of the battery under the corresponding discharge number. Different batteries have different standard charging capacities corresponding to the same number of charge and discharge. Therefore, the first configuration table in this embodiment corresponds to the battery, and different batteries have different first configuration tables. Then, the target charging capacity corresponding to this charge is calculated using the target model, and the target charging capacity is calculated by the standard charging capacity and the preset ratio. For example, when the standard charging capacity corresponding to the current number of charge and discharge is 90% of the full charge capacity when the battery is first used, the preset ratio is 95%, which means that 5% of the power needs to be sacrificed to achieve the effect of protecting the battery from aggravating aging. The preset ratio can be determined based on experiments, and the specific value is uncertain. For different batteries, the preset ratio may also be different. Multiplying the standard charging capacity by 95% can obtain the corresponding target charging capacity for this time.

[0099] Furthermore, the system will also preset a second configuration table, which matches and records the open circuit potential of the battery corresponding to different standard charging capacities. When the system uses the target model to calculate the configuration parameters, it will first obtain the first target parameter. The number of charge and discharge times recorded in the first target parameter can be an integer or a decimal, such as 50.5 times, which indicates that the user's last charge and discharge only involved 50% of the power. Then the system will use the target model to match the obtained charge and discharge times in the first configuration table to determine the corresponding standard charging capacity, and then use the standard charging capacity to match it in the second configuration table to determine the corresponding first open circuit potential. The first open circuit potential is used for the subsequent calculation of the voltage parameter or current parameter in the configuration parameters. The above process is the calculation process involved when the target model calculates the configuration parameters.

[0100] Furthermore, the second target parameter includes the current value and voltage value currently output by the battery;

[0101] The step of processing the second target parameter based on the target model to obtain the configuration parameter includes:

[0102] S12: Processing the current value and the voltage value based on the target model to obtain a first resistance value.

[0103] In this embodiment, after the current value and voltage value involved in the second target parameter are input into the target model, the target model will calculate and determine the first resistance value of the current battery, that is, the internal resistance value, because as the battery is used, it will age to varying degrees, and the actual degree of aging cannot be estimated by the system. This is directly related to the actual use process and actual use status of the battery, that is, it is directly related to the user's use of the electronic device, so it has a strong uncertainty and cannot be estimated in advance. Therefore, the system needs to calculate and determine the first resistance value of the current battery each time it is charged, or each time it is charged using the target charging strategy, so as to accurately calculate the voltage parameters or current parameters later.

[0104] In this embodiment, the second target parameter includes a voltage parameter or a current parameter in the original charging strategy;

[0105] The step of processing the second target parameter based on the target model to obtain the configuration parameter includes:

[0106] S13: Processing the current parameter, the first open circuit potential and the first resistance in the original charging strategy based on the target model, and calculating and determining candidate voltage parameters corresponding to the current charging process; or

[0107] The voltage parameter, the first open circuit potential and the first resistance value in the original charging strategy are processed based on the target model to calculate and determine candidate current parameters corresponding to the current charging process.

[0108] For example, when the target model uses the current parameter, the first open circuit potential and the first resistance in the original charging strategy to calculate the candidate voltage parameter, the calculation formula used is: V0'=OCV1+M*R, where M is the current parameter in the original charging strategy, R is the first resistance, OCV1 is the first open circuit potential, and V0' is the calculated candidate voltage parameter.

[0109] When the target model uses the voltage parameter, the first open circuit potential and the first resistance in the original charging strategy to calculate the candidate voltage parameter, the calculation formula used is: M'=(V0-OCV1) / R, where V0 is the voltage parameter in the original charging strategy, R is the first resistance, OCV1 is the first open circuit potential, and M' is the calculated candidate current parameter.

[0110] In order to ensure that the candidate current parameters or candidate voltage parameters determined by calculation can play the due effect when controlled charging, and avoid accelerating the aging of the battery cells while ensuring the charging speed and charging capacity, the system needs to verify the candidate current parameters and candidate voltage parameters. Based on this, the method further includes:

[0111] S14: comparing the candidate current parameter with the current parameter, or comparing the candidate voltage parameter with the voltage parameter based on the target model, and taking the current parameter corresponding to the smaller one, or the voltage parameter corresponding to the larger one as the configuration parameter of the target charging strategy based on the comparison result.

[0112] That is, based on the comparison result, the system takes the current parameter corresponding to the smaller one as the target cutoff current, or takes the voltage parameter corresponding to the larger one as the target cutoff voltage. The configuration parameters include the target cutoff current and the target cutoff voltage. The system completes the battery charging control based on the target cutoff current or the target cutoff voltage.

[0113] In another embodiment, when entering the constant current or constant voltage stage of the charging process, the system uses the newly calculated configuration parameters to control the charging, so that the charging current or charging voltage is directly charged based on the final cut-off current or cut-off voltage during the corresponding constant current or constant voltage stage. The span is relatively large, and the charging speed has a relatively weakened effect. In particular, when the gap between the corresponding charging capacity and the standard charging capacity is large, the above-mentioned effect is relatively obvious. Therefore, in order to further ensure that the charging speed is not affected, or is minimally affected, the method described in this embodiment also includes:

[0114] S15: Calculating the standard charging capacity and the preset ratio based on the target model to obtain the target charging capacity corresponding to this charging;

[0115] S16: when the capacity difference between the target charging capacity and the standard charging capacity meets a condition, at least dividing the constant voltage charging stage of the battery into a plurality of sub-stages;

[0116] S17: Determine the sub-target charging capacity of the sub-stage;

[0117] S18: Determine a second open circuit potential of the battery based on the sub-target charging capacity;

[0118] S19: adjusting an initial cut-off voltage or an initial cut-off current of the battery in a corresponding charging sub-stage based on the second open-circuit potential and the first resistance;

[0119] S20: controlling the charging of the battery in the corresponding charging sub-stage based on the adjusted cut-off voltage or cut-off current, so that the battery automatically enters the next sub-stage to continue charging when it is charged to have a sub-target charging capacity.

[0120] After obtaining the target charging capacity, determine the capacity difference between it and the standard charging capacity. If the capacity difference meets the conditions, at least the constant voltage charging stage of the battery can be divided into multiple sub-stages, that is, the last charging stage of the battery is divided into sections (the battery usually goes through a constant current charging stage first, and then goes through a constant voltage charging stage to complete charging) to form multiple sub-stages. Then, the following process is performed for each sub-stage, including determining the sub-target charging capacity of the sub-stage, which can be determined by dividing the remaining target charging capacity of the current stage based on the pre-configured division relationship, and then determining the second open circuit potential of the battery based on the sub-target charging capacity. The second open circuit potential can be specifically determined by matching in the second configuration table, or it can be determined by querying in the curve relationship diagram between the open circuit potential and the charging capacity. Afterwards, the system can calculate the sub-voltage parameters and sub-current parameters corresponding to the current sub-charging stage based on the second open-circuit potential, the first resistance value, and the current parameters and voltage parameters in the currently calculated configuration parameters, and control the charging of the sub-stage based on the sub-voltage parameters or sub-current parameters, and repeat the above process when the charging is completed and proceed to the next sub-stage charging until the current charging is completed.

[0121] The above method of dividing the charging process into multiple stages can make the current or voltage change gradually, so the impact on the charging circuit or charging voltage is gradual. Therefore, compared with directly controlling the charging based on the final voltage parameters or current parameters, the above scheme can improve the charging speed to a certain extent and ensure that the overall charging speed does not change significantly compared to the past.

[0122] When applying the above scheme to control battery charging, if Figure 3 As shown, for example, the calculation of the current parameter M' is used as an example to illustrate:

[0123] Assume that the full charge capacity of the battery cell is 5000mAh when it leaves the factory, M is 0.75A, and when the number of cycles is 200:

[0124] 1. The cycle number target is 1800, the cycle attenuation target is 80%, and when the current cycle number is 200, the current charge capacity is calculated to be (100% - (100% - 80%) / 1800 * 200) * 5000 = 4889 mAh;

[0125] 2. It is known that the current fully charged capacity of the battery cell is 4900mAh, that is, the open circuit potential is 3V when the capacity is 0mAh, and the open circuit potential is 4.43V when the capacity is 4900mAh. According to the capacity-open circuit potential relationship table (second configuration table), it is found that when the capacity is 4889mAh, the first open circuit potential OCV1 is 4.428V;

[0126] 3. Calculate the impedance of the battery cell (the first resistance value) based on the V / I characteristics: 80 mOhm, determine the charging cut-off voltage V0 = 4.48 V, and calculate M' = (V0 - OCV1) / R = (4.48 - 4.428) / 0.08 = 0.65 A;

[0127] 4. Compare 0.65 A < 0.75 A, that is, M' < M. Therefore, the current parameters of the default configuration are used to control the completion of this charging process, and this process also corresponds to the situation when the first target parameter does not meet the conditions.

[0128] When the number of cycles is 900

[0129] 1. The target number of cycles is 1800, the target cycle attenuation is 80%, the current number of cycles is 900, and calculate the current capacity to be charged as (100% - (100% - 80%) / 1800 * 900) * 5000 = 4500 mAh;

[0130] 2. It is known that the full charge capacity of the current battery cell is 4600 mAh, that is, the open circuit potential is 3 V when the capacity is 0 mAh, and the open circuit potential is 4.43 V when the capacity is 4600 mAh. According to the capacity-open circuit potential relationship table, when the capacity is 4500 mAh, the first open circuit potential OCV1 is 4.41 V;

[0131] 3. Calculate the impedance of the battery cell based on the V / I characteristics: 80 mOhm, the charging cut-off voltage V0 = 4.48 V, and calculate M' = (V0 - OCV1) / R = (4.48 - 4.41) / 0.084 = 0.833 A;

[0132] 4. Compare 0.833 A > 0.75 A, that is, M' > M. Therefore, the charging process of this time is controlled based on M'.

[0133] As Figure 4 shown, another embodiment of the present application also provides a battery charging device, including:

[0134] The first acquisition module is used to acquire the connection of the external adapter;

[0135] The second acquisition module is used to acquire the first target parameter, and the first target parameter at least includes the parameter information of the battery;

[0136] The first determination module is used to determine the target charging strategy according to the first target parameter;

[0137] The second determination module is used to determine the configuration parameters of the target charging strategy according to the second target parameter;

[0138] The control module is used to control the charging of the battery according to the target charging strategy;

[0139] The configuration parameters of the target charging strategy include at least one of the following:

[0140] The voltage parameter for controlling charging to stop included in the configuration parameters of the target charging strategy is lower than the voltage parameter for controlling charging to stop in the original charging strategy, or;

[0141] The current parameter for controlling charging to stop included in the configuration parameters of the target charging strategy is higher than the current parameter for controlling charging to stop of the original charging strategy.

[0142] In some embodiments, the first target parameter is different, and the voltage parameter or current parameter included in the configuration parameter for controlling charging stop is different;

[0143] The first target parameter and the second target parameter are obtained based on the connection of the external adapter, and the first target parameter is partially identical to the second target parameter.

[0144] In some embodiments, determining the configuration parameters of the target charging strategy based on the second target parameter includes:

[0145] The configuration parameter is obtained by processing the second target parameter based on a target model, wherein the target model corresponds to the battery.

[0146] In some embodiments, the second target parameter includes the number of charge and discharge cycles;

[0147] The step of processing the second target parameter based on the target model to obtain the configuration parameter includes:

[0148] Based on the target model, query in a first configuration table to determine a standard charging capacity corresponding to the number of charge and discharge cycles, where different numbers of charge and discharge cycles correspond to different standard charging capacities, and the first configuration table corresponds to the battery;

[0149] Processing the standard charging capacity based on the target model to obtain a target charging capacity corresponding to this charging;

[0150] The first open circuit potential corresponding to the target charging capacity is determined by querying the second configuration table based on the target model, and different target charging capacities correspond to different first open circuit potentials.

[0151] In some embodiments, the second target parameter includes a current value and a voltage value currently output by the battery;

[0152] The step of processing the second target parameter based on the target model to obtain the configuration parameter includes:

[0153] The current value and the voltage value are processed based on the target model to obtain a first resistance value.

[0154] In some embodiments, the second target parameter includes a voltage parameter or a current parameter in the original charging strategy;

[0155] The step of processing the second target parameter based on the target model to obtain the configuration parameter includes:

[0156] Processing the current parameter, the first open circuit potential and the first resistance in the original charging strategy based on the target model, and calculating and determining candidate voltage parameters corresponding to the current charging process; or

[0157] The voltage parameter, the first open circuit potential and the first resistance value in the original charging strategy are processed based on the target model to calculate and determine candidate current parameters corresponding to the current charging process.

[0158] In some embodiments, the second target parameter includes a charging cut-off voltage used in the current battery charging process;

[0159] The device also includes:

[0160] A comparison module is used to compare the candidate current parameter with the current parameter, or compare the candidate voltage parameter with the voltage parameter according to the target model, and based on the comparison result, use the current parameter corresponding to the smaller one or the voltage parameter corresponding to the larger one as the configuration parameter.

[0161] In some embodiments, the apparatus further comprises:

[0162] a division module, configured to divide the constant voltage charging phase of the battery into at least a plurality of sub-phases when the capacity difference between the target charging capacity and the standard charging capacity meets a condition;

[0163] A third determination module, used to determine the sub-target charging capacity of the sub-stage;

[0164] a fourth determination module, configured to determine a second open circuit potential of the battery according to the sub-target charging capacity;

[0165] an adjustment module, configured to adjust an initial cut-off voltage or an initial cut-off current of the battery in a corresponding charging sub-stage according to the second open-circuit potential and the first resistance;

[0166] The control module is also used to control the charging of the battery in the corresponding charging sub-stage according to the adjusted cut-off voltage or cut-off current, so that the battery automatically enters the next sub-stage to continue charging when it is charged to have a sub-target charging capacity.

[0167] In some embodiments, determining the target charging strategy according to the first target parameter includes:

[0168] If the first target parameter meets the target condition, determining to use the target charging strategy to complete the charging of the battery this time;

[0169] If the first target parameter does not meet the target condition, it is determined to use the original charging strategy to complete the charging of the battery this time.

[0170] Another embodiment of the present application further provides an electronic device, comprising:

[0171] one or more processors;

[0172] a memory configured to store one or more programs;

[0173] When the one or more programs are executed by the one or more processors, the one or more processors implement the battery charging method as described in any of the above embodiments.

[0174] Furthermore, an embodiment of the present application also provides a storage medium on which a computer program is stored, and when the program is executed by a processor, the battery charging method described above is implemented. It should be understood that each solution in this embodiment has the corresponding technical effect in the above method embodiment, which will not be repeated here.

[0175] Furthermore, an embodiment of the present application also provides a computer program product, which is tangibly stored on a computer-readable medium and includes computer-readable instructions, which, when executed, cause at least one processor to perform a battery charging method such as that in the embodiment described above.

[0176] It should be noted that the computer storage medium of the present application may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, system or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access storage medium (RAM), a read-only storage medium (ROM), an erasable programmable read-only storage medium (EPROM or flash memory), an optical fiber, a portable compact disk read-only storage medium (CD-ROM), an optical storage medium, a magnetic storage medium, or any suitable combination of the above. In the present application, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, system or device. In the present application, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, in which a computer-readable program code is carried. This propagated data signal may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can send, propagate or transmit a program configured to be used by or in conjunction with an instruction execution system, system or device. The program code contained on the computer-readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, antenna, optical cable, RF, etc., or any suitable combination of the above.

[0177] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions.

[0178] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce a product including an instruction system, which is implemented in the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0179] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A battery charging method, comprising: Get the connection of the external adapter; Obtaining a first target parameter, wherein the first target parameter at least includes parameter information of a battery; determining a target charging strategy based on the first target parameter; Determining configuration parameters of the target charging strategy based on the second target parameter; Controlling charging of the battery based on the target charging strategy; The configuration parameters of the target charging strategy include at least one of the following: The voltage parameter for controlling charging to stop included in the configuration parameters of the target charging strategy is lower than the voltage parameter for controlling charging to stop in the original charging strategy, or; The current parameter for controlling charging to stop included in the configuration parameters of the target charging strategy is higher than the current parameter for controlling charging to stop of the original charging strategy.

2. The battery charging method according to claim 1, wherein: The first target parameters are different, and the voltage parameters or current parameters included in the configuration parameters for controlling charging stop are different; The first target parameter and the second target parameter are obtained based on the connection of the external adapter, and the first target parameter is partially identical to the second target parameter.

3. The battery charging method according to claim 1, wherein: Determining the configuration parameters of the target charging strategy based on the second target parameter includes: The configuration parameter is obtained by processing the second target parameter based on a target model, wherein the target model corresponds to the battery.

4. The battery charging method according to claim 3, wherein: The second target parameter includes the number of charge and discharge cycles; The step of processing the second target parameter based on the target model to obtain the configuration parameter includes: Based on the target model, query in a first configuration table to determine a standard charging capacity corresponding to the number of charge and discharge cycles, where different numbers of charge and discharge cycles correspond to different standard charging capacities, and the first configuration table corresponds to the battery; Processing the standard charging capacity based on the target model to obtain a target charging capacity corresponding to this charging; The first open circuit potential corresponding to the target charging capacity is determined by querying the second configuration table based on the target model, and different target charging capacities correspond to different first open circuit potentials.

5. The battery charging method according to claim 4, wherein: The second target parameter includes the current value and voltage value currently output by the battery; The step of processing the second target parameter based on the target model to obtain the configuration parameter includes: The current value and the voltage value are processed based on the target model to obtain a first resistance value.

6. The battery charging method according to claim 5, wherein: The second target parameter includes a voltage parameter or a current parameter in the original charging strategy; The step of processing the second target parameter based on the target model to obtain the configuration parameter includes: Processing the current parameter, the first open circuit potential and the first resistance in the original charging strategy based on the target model, and calculating and determining candidate voltage parameters corresponding to the current charging process; or The voltage parameter, the first open circuit potential and the first resistance value in the original charging strategy are processed based on the target model to calculate and determine candidate current parameters corresponding to the current charging process.

7. The battery charging method according to claim 6, wherein: The second target parameter also includes a charging cut-off voltage used in the current battery charging process; The method further comprises: The candidate current parameter is compared with the current parameter, or the candidate voltage parameter is compared with the voltage parameter based on the target model, and based on the comparison result, the current parameter corresponding to the smaller one or the voltage parameter corresponding to the larger one is used as the configuration parameter.

8. The battery charging method according to claim 4, wherein: The method further comprises: When the capacity difference between the target charging capacity and the standard charging capacity meets a condition, at least dividing the constant voltage charging stage of the battery into a plurality of sub-stages; Determining a sub-target charging capacity of the sub-stage; determining a second open circuit potential of the battery based on the sub-target charging capacity; Adjusting an initial cut-off voltage or an initial cut-off current of the battery in a corresponding charging sub-stage based on the second open-circuit potential and the first resistance value; The charging of the battery in the corresponding charging sub-stage is controlled based on the adjusted cut-off voltage or cut-off current, so that the battery automatically enters the next sub-stage to continue charging when it is charged to have a sub-target charging capacity.

9. The battery charging method according to claim 1, wherein: The step of determining a target charging strategy according to the first target parameter includes: If the first target parameter meets the target condition, determining to use the target charging strategy to complete the charging of the battery this time; If the first target parameter does not meet the target condition, it is determined to use the original charging strategy to complete the charging of the battery this time.

10. A battery charging device comprising: A first obtaining module, used to obtain a connection of an external adapter; A second obtaining module, used to obtain a first target parameter, where the first target parameter at least includes parameter information of a battery; A first determination module, configured to determine a target charging strategy according to a first target parameter; A second determination module, configured to determine configuration parameters of the target charging strategy according to a second target parameter; A control module, configured to control charging of the battery according to the target charging strategy; The configuration parameters of the target charging strategy include at least one of the following: The voltage parameter for controlling charging to stop included in the configuration parameters of the target charging strategy is lower than the voltage parameter for controlling charging to stop in the original charging strategy, or; The current parameter for controlling charging to stop included in the configuration parameters of the target charging strategy is higher than the current parameter for controlling charging to stop of the original charging strategy.

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