An adaptive fast charging protection method and system for mobile devices

Abstract

The present application discloses an adaptive fast charging protection method and system for mobile devices, which is used to adaptively adjust the charging current and charging stage to extend the service life of the battery. The method of the present application includes: obtaining electrochemical impedance spectroscopy data of the battery, which is used to combine with the number of cycles and capacity attenuation factor of the battery to evaluate the degree of battery aging; determining the charging current in the pre-charging stage based on the battery aging evaluation result; when the real-time voltage of the battery reaches the constant current charging voltage threshold, adjusting the charging current according to the real-time temperature of the battery to switch to the constant current charging stage; when the real-time voltage of the battery reaches the constant voltage charging voltage threshold, adjusting the charging current secondary through current pulse optimization to switch to the constant voltage charging stage, the constant voltage charging voltage threshold being greater than the constant current charging voltage threshold; when the battery capacity of the battery reaches a preset full load threshold, adjusting the charging current to within the trickle charging current range to switch to the trickle charging stage.

Description

Technical Field

[0001] The present application relates to the field of fast charging technology, and in particular to an adaptive fast charging protection method and system for mobile devices. Background Art

[0002] With the advancement of digital information, mobile devices such as smartphones, tablets, and smartwatches have become deeply integrated into people's daily lives and work environments. Users' increasing dependence on mobile devices has made device battery life and charging speed key factors influencing the user experience. To meet users' urgent need for fast charging, fast charging technology is widely adopted by various mobile devices on the market. By increasing charging power, fast charging technology can replenish a large amount of power in a short period of time, significantly shortening charging time and significantly improving user convenience.

[0003] However, while fast charging technology brings convenience, it also raises a series of battery-related issues. During fast charging, complex electrochemical reactions occur within the battery, generating significant heat. Excessive temperatures accelerate the aging and decomposition of internal battery materials, affecting battery performance and lifespan. Furthermore, high current charging exacerbates battery polarization, leading to accelerated loss of active materials and, in turn, accelerated capacity decay.

[0004] Currently, fast charging for mobile devices typically adjusts the charging process based on basic battery parameters such as voltage and current. However, when the battery's internal state changes, the existing charging process cannot adapt to these changes, which can exacerbate battery capacity degradation and ultimately limit the battery life of mobile devices. Summary of the Invention

[0005] The present application provides an adaptive fast charging protection method and system for mobile devices, which can adaptively adjust the charging current and charging stage to extend the battery life.

[0006] The first aspect of the present application provides an adaptive fast charging protection method for a mobile device, comprising:

[0007] Acquiring electrochemical impedance spectroscopy data of a battery, wherein the electrochemical impedance spectroscopy data is used to evaluate the aging degree of the battery in combination with the cycle number and capacity attenuation factor of the battery;

[0008] determining a charging current in a pre-charging stage according to an aging evaluation result of the battery, and pre-charging the battery based on the charging current;

[0009] When the real-time voltage of the battery reaches a constant current charging voltage threshold, adjusting the charging current according to the real-time temperature of the battery to switch to a constant current charging stage;

[0010] When the real-time voltage of the battery reaches a constant voltage charging voltage threshold, the charging current is secondary adjusted through current pulse optimization to switch to a constant voltage charging stage, and the constant voltage charging voltage threshold is greater than the constant current charging voltage threshold;

[0011] When the battery capacity of the battery reaches a preset full-load threshold, the charging current is adjusted to a trickle charging current range to switch to a trickle charging stage.

[0012] Optionally, after adjusting the charging current to within the trickle charging current range to switch to the trickle charging stage, the method further includes:

[0013] determining whether the battery is in an overcurrent state or an overvoltage state according to the real-time voltage, real-time current, and real-time temperature of the battery;

[0014] If so, a charging protection action is triggered, and the charging protection action is used to cut off the charging process of the battery or reduce the charging current.

[0015] Optionally, determining the charging current in the pre-charging stage according to the aging evaluation result of the battery includes:

[0016] Acquire battery attributes of the battery, where the battery attributes include battery type and battery capacity range;

[0017] Obtaining an initial current that matches the battery properties and aging assessment result from a preset charging ratio database;

[0018] The initial current is corrected according to the real-time temperature of the battery to obtain the charging current in the pre-charging stage.

[0019] Optionally, adjusting the charging current according to the real-time temperature of the battery to switch to the constant current charging stage includes:

[0020] Calculating a current temperature deviation between the real-time temperature of the battery and a target temperature;

[0021] Performing PID calculation on the current temperature deviation to obtain a current adjustment value;

[0022] Summing the current adjustment value and the charging current to obtain a constant current charging current;

[0023] The battery is charged based on the constant current charging current to switch the current charging state of the battery to a constant current charging stage.

[0024] Optionally, the secondarily adjusting the charging current through current pulse optimization to switch to the constant voltage charging stage includes:

[0025] applying a pulse current to the battery;

[0026] adjusting the pulse parameters of the pulse current in real time according to the state of charge and real-time temperature of the battery, the pulse parameters including frequency, duty cycle and amplitude;

[0027] The charging current is reduced based on the real-time change of the pulse parameters to switch the current charging state of the battery to a constant voltage charging stage.

[0028] Optionally, before the secondary adjustment of the charging current through current pulse optimization to switch to the constant voltage charging stage, the method further includes:

[0029] Calculate the curve deviation between the current charging curve and the preset charging curve using a dynamic time warping algorithm;

[0030] determining a current internal state of the battery based on the electrochemical impedance spectroscopy data;

[0031] Assign different weights to the curve deviation value and the current internal state degree respectively, and calculate a comprehensive score;

[0032] When the comprehensive score reaches a preset score value, the step of adjusting the charging current secondary through current pulse optimization to switch to a constant voltage charging stage is performed.

[0033] A second aspect of the present application provides an adaptive mobile device fast charging protection system, comprising:

[0034] an acquisition unit, configured to acquire electrochemical impedance spectroscopy data of a battery, wherein the electrochemical impedance spectroscopy data is used to be combined with the cycle number and capacity attenuation factor of the battery to evaluate the aging degree of the battery;

[0035] a first determining unit, configured to determine a charging current in a pre-charging stage according to an aging evaluation result of the battery, and pre-charge the battery based on the charging current;

[0036] a first adjusting unit, configured to adjust the charging current according to the real-time temperature of the battery to switch to a constant current charging stage when the real-time voltage of the battery reaches a constant current charging voltage threshold;

[0037] a second adjustment unit, configured to adjust the charging current secondary through current pulse optimization to switch to a constant voltage charging stage when the real-time voltage of the battery reaches a constant voltage charging voltage threshold, wherein the constant voltage charging voltage threshold is greater than the constant current charging voltage threshold;

[0038] The third adjusting unit is configured to adjust the charging current to a trickle charging current range to switch to a trickle charging stage when the battery capacity of the battery reaches a preset full load threshold.

[0039] Optionally, the system further includes:

[0040] a judging unit, configured to judge whether the battery is in an overcurrent state or an overvoltage state according to the real-time voltage, real-time current, and real-time temperature of the battery;

[0041] The trigger unit is used to trigger a charging protection action when the battery is in an overcurrent state or an overvoltage state, and the charging protection action is used to cut off the charging process of the battery or reduce the charging current.

[0042] Optionally, the first determining unit is specifically configured to:

[0043] Acquire battery attributes of the battery, where the battery attributes include battery type and battery capacity range;

[0044] Obtaining an initial current that matches the battery properties and aging assessment result from a preset charging ratio database;

[0045] The initial current is corrected according to the real-time temperature of the battery to obtain the charging current in the pre-charging stage.

[0046] Optionally, the first adjustment unit is specifically configured to:

[0047] Calculating a current temperature deviation between the real-time temperature of the battery and a target temperature;

[0048] Performing PID calculation on the current temperature deviation to obtain a current adjustment value;

[0049] Summing the current adjustment value and the charging current to obtain a constant current charging current;

[0050] The battery is charged based on the constant current charging current to switch the current charging state of the battery to a constant current charging stage.

[0051] It can be seen from the above technical solutions that this application has the following effects:

[0052] First, the battery's electrochemical impedance spectroscopy (EIS) data is acquired and combined with the battery's cycle count and capacity decay factor to assess the battery's aging. The pre-charge phase charging current is then determined based on the battery's aging assessment results, and the battery is pre-charged based on the charging current. When the battery's real-time voltage reaches a constant-current charging voltage threshold, the charging current is adjusted based on the battery's real-time temperature to switch to the constant-current charging phase. When the battery's real-time voltage reaches a constant-voltage charging voltage threshold, the charging current is further adjusted through current pulse optimization to switch to the constant-voltage charging phase, where the constant-voltage charging voltage threshold is greater than the constant-current charging voltage threshold. When the battery's capacity reaches a preset full-load threshold, the charging current is further adjusted to within the trickle charging current range to switch to the trickle charging phase. In this way, the battery's EIS data, cycle count, and capacity decay factor can be combined to accurately assess the battery's aging, providing a reliable basis for subsequent charging strategy adjustments. The charging current and charging phase are adaptively adjusted based on factors such as the battery's aging, real-time voltage, and real-time temperature, effectively protecting the battery and extending its service life while achieving fast charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 A schematic diagram of an embodiment of an adaptive fast charging protection method for a mobile device in this application;

[0054] Figure 2-1 and Figure 2-2 This is a schematic diagram of another embodiment of an adaptive fast charging protection method for mobile devices in this application;

[0055] Figure 3 This is a schematic diagram of an embodiment of an adaptive mobile device fast charging protection system in this application;

[0056] Figure 4 This is a schematic diagram of another embodiment of an adaptive mobile device fast charging protection system in this application. DETAILED DESCRIPTION

[0057] The present application provides an adaptive fast charging protection method and system for mobile devices, which are used to adaptively adjust the charging current and charging stage to extend the service life of the battery.

[0058] The adaptive mobile device fast charging protection method described in this application is applied to a terminal, a system or a server for execution and implementation.

[0059] See also Figure 1 As shown, an embodiment of the adaptive fast charging protection method for mobile devices in the present application includes:

[0060] 101. Obtaining electrochemical impedance spectroscopy data of the battery, which is used to evaluate the degree of battery aging in combination with the number of cycles and capacity attenuation factor of the battery;

[0061] In this embodiment, a high-precision electrochemical impedance spectroscopy measurement device is used to apply small AC excitation signals of different frequencies to the battery of the mobile device when the mobile device is in a dormant state or a low-load state. By measuring the battery's response to these excitation signals, the battery's electrochemical impedance spectroscopy data is obtained. It should be noted that the electrochemical impedance spectroscopy data contains key information such as internal charge transfer resistance, diffusion impedance, and double-layer capacitance. At the same time, the battery cycle count data is extracted from the system log of the mobile device. The cycle count represents the number of complete cycles of the battery from a fully charged state to a fully discharged state and then to a fully charged state. The capacity attenuation factor is obtained by comparing the current actual capacity of the battery with the initial rated capacity. The actual capacity can be measured using the ampere-hour integration method combined with the coulomb efficiency correction. The initial rated capacity represents the rated capacity of the battery when it is first used.

[0062] After obtaining the battery's electrochemical impedance spectroscopy data, cycle count, and capacity attenuation factor, a pre-established neural network model or equivalent circuit model can be used to assess the degree of aging. For example, a large amount of battery sample data with different degrees of aging can be used to train a battery aging assessment model using a support vector machine algorithm. The acquired electrochemical impedance spectroscopy data, battery cycle count, and capacity attenuation factor are input into the battery aging assessment model, which then outputs the battery aging assessment result. The aging assessment result can be presented as a percentage. For example, an aging assessment result of 60% indicates that the battery's aging is at a medium level.

[0063] 102. Determine a charging current in a pre-charging stage according to an aging evaluation result of the battery, and pre-charge the battery based on the charging current;

[0064] In this embodiment, the primary purpose of the pre-charge phase is to restore and activate over-discharged or aged batteries. During this phase, the charging current is relatively low. After obtaining the battery aging assessment results, a current matching the aging assessment results is queried from a preset charging ratio database to determine the charging current for the pre-charge phase. For example, the preset charging ratio database may pre-set the following rules: mild aging corresponds to 0.6C, relatively low aging corresponds to 0.5C, moderate aging corresponds to 0.4C, relatively high aging corresponds to 0.3C, and severe aging corresponds to 0.2C, where C is the rated capacity of the battery. A aging assessment result of 0-20% indicates mild aging, 21-40% indicates relatively low aging, 41-60% indicates moderate aging, 61-80% indicates relatively high aging, and 81-100% indicates severe aging.

[0065] 103. When the real-time voltage of the battery reaches the constant current charging voltage threshold, the charging current is adjusted according to the real-time temperature of the battery to switch to the constant current charging stage;

[0066] During the pre-charge process, the battery's real-time voltage is continuously monitored, and the battery's real-time temperature is collected via a temperature sensor mounted on the battery pack housing. When the battery's real-time voltage rises to the preset constant-current charging voltage threshold, the current charging current is adjusted based on real-time temperature feedback. At this point, the charging current rapidly increases from the lower value in the pre-charge phase to the set value for the constant-current charging phase, switching the battery's charging state from the pre-charge phase to the constant-current charging phase. It should be noted that during the pre-charge phase, the battery's internal state primarily activates and repairs the active materials on the electrode surfaces. Lithium ions begin to migrate from the positive electrode to the negative electrode, but the migration rate is relatively slow. Once the constant-current charging phase begins, the migration rate of lithium ions accelerates, and the chemical reactions within the battery become more intense. A large number of lithium ions are deintercalated from the positive electrode material, diffuse through the electrolyte toward the negative electrode, and then intercalate into the negative electrode material. Simultaneously, the internal resistance of the battery generates a certain amount of heat as the current increases. This heat dissipation system is required to dissipate the heat promptly to maintain the battery's normal temperature.

[0067] 104. When the real-time voltage of the battery reaches the constant voltage charging voltage threshold, the charging current is adjusted secondary through current pulse optimization to switch to the constant voltage charging stage, and the constant voltage charging voltage threshold is greater than the constant current charging voltage threshold;

[0068] During constant-current charging, the battery's real-time voltage continuously rises as charging progresses. When the battery's real-time voltage reaches the constant-voltage charging threshold, the switch from constant-current to constant-voltage charging is triggered. During the constant-voltage charging phase, the real-time voltage remains constant within a range near the constant-voltage charging threshold, while the charging current gradually decreases as the battery charge increases. This charging current reduction process is dynamically adjusted using current pulse optimization technology to improve battery charging stability. It should be noted that after entering the constant-voltage charging phase, as the battery charge continues to increase, the difficulty of lithium ion insertion into the negative electrode material gradually increases. This intensifies internal polarization, leading to an increase in the battery's internal resistance. At this stage, while the voltage remains constant, the decrease in charging current means that lithium ion migration slows, and the chemical reactions within the battery gradually become more gradual. Simultaneously, heat generation within the battery decreases as the charging current decreases.

[0069] 105. When the battery capacity of the battery reaches a preset full load threshold, the charging current is adjusted to within a trickle charging current range to switch to a trickle charging stage.

[0070] During constant-voltage charging, the battery's capacity continues to increase. When the battery capacity reaches the preset full-load threshold, the charging current is reduced based on the real-time temperature and a temperature compensation algorithm, adjusting the charging current to a trickle charging current range. For example, the trickle charging current range can be set to 1%-5% of the battery's rated capacity, switching the battery's charging state from the constant-voltage charging stage to the trickle charging stage. During the trickle charging stage, the battery is supplemented with a small charging current to fully saturate the battery capacity, while avoiding overcharging and further protecting the battery.

[0071] In this embodiment, the electrochemical impedance spectroscopy data of the battery is first obtained. The electrochemical impedance spectroscopy data is used to combine with the battery's cycle count and capacity decay factor to assess the degree of battery aging. Then, the charging current of the pre-charging stage is determined based on the battery aging assessment result, and the battery is pre-charged based on the charging current. When the real-time voltage of the battery reaches the constant current charging voltage threshold, the charging current is adjusted according to the real-time temperature of the battery to switch to the constant current charging stage. When the real-time voltage of the battery reaches the constant voltage charging voltage threshold, the charging current is further adjusted secondary through current pulse optimization to switch to the constant voltage charging stage, and the constant voltage charging voltage threshold is greater than the constant current charging voltage threshold. When the battery capacity reaches the preset full load threshold, the charging current is further adjusted to the trickle charging current range to switch to the trickle charging stage. In this way, the degree of battery aging can be accurately assessed by combining the electrochemical impedance spectroscopy data of the battery, the number of battery cycles, and the capacity decay factor, providing a reliable basis for subsequent charging strategy adjustments. According to factors such as the degree of battery aging, real-time voltage, and real-time temperature, the charging current and charging stage are adaptively adjusted to achieve fast charging while effectively protecting the battery and extending the battery life.

[0072] See also Figure 2-1 and Figure 2-2 As shown, another embodiment of the adaptive mobile device fast charging protection method in the present application includes:

[0073] 201. Obtaining electrochemical impedance spectroscopy data of the battery, wherein the electrochemical impedance spectroscopy data is used to evaluate the aging degree of the battery in combination with the cycle number and capacity attenuation factor of the battery;

[0074] Step 201 in this embodiment is the same as the aforementioned Figure 1 Step 101 in the illustrated embodiment is similar and will not be described again here.

[0075] 202. Obtain battery attributes of the battery, where the battery attributes include battery type and battery capacity range;

[0076] 203. Obtaining an initial current that matches the battery properties and aging evaluation results from a preset charging ratio database;

[0077] 204. Correct the initial current according to the real-time temperature of the battery to obtain a charging current in a pre-charging stage, and pre-charge the battery based on the charging current.

[0078] Optionally, in this embodiment, a preset charging ratio database can be pre-established. This preset charging ratio database stores the correspondence between variables such as battery type, battery capacity range, and aging assessment results, and the initial current. This initial current represents the safe starting current of the battery during charging. For example, if Battery A is a lithium-ion battery, has a capacity range of 1000mAh-2000mAh, and is assessed as mildly aged, the corresponding initial current is 0.8C, where C is the rated capacity of the battery. Furthermore, because different temperature conditions can have different effects on the safe starting current of a battery, after obtaining the initial current, it can be corrected based on the battery's real-time temperature to improve battery safety. Specifically, the initial current correction can be performed through a segmented temperature compensation method. For example: when the real-time temperature of the battery is in the low temperature range of 0-10°C, the temperature compensation coefficient is set to 0.75, and the initial current needs to be adjusted to 75% of the original; when the real-time temperature of the battery is in the high temperature range of 30-40°C, the temperature compensation coefficient is set to 0.85, and the initial current needs to be adjusted to 85% of the original.

[0079] 205. When the real-time voltage of the battery reaches the constant current charging voltage threshold, the current temperature deviation between the real-time temperature of the battery and the target temperature is calculated;

[0080] 206. Perform PID calculation on the current temperature deviation to obtain a current adjustment value;

[0081] 207. Sum the current adjustment value and the charging current to obtain a constant charging current;

[0082] 208. Charging the battery based on a constant current charging current to switch the current charging state of the battery to a constant current charging stage;

[0083] Optionally, in this embodiment, when the real-time voltage of the battery reaches the constant current charging voltage threshold, it indicates that the constant current charging stage can be switched. At this time, the constant current charging current can be determined by the PID control algorithm of the real-time temperature. Specifically, the current temperature of the battery is set to , the target temperature is , current temperature difference During the PID operation, the proportional link output ,in is the proportional coefficient, which determines how quickly the system responds to temperature deviations; the integral link output ,in is the integral coefficient, which is used to eliminate the steady-state error of the system; the differential link output ,in is the differential coefficient, which can predict the temperature change trend and improve the stability of the system. After PID operation, the current adjustment value is obtained . Then the charging current in the pre-charging stage and current regulation value By adding them together, we can get the constant current charging current It is worth noting that during constant current charging, the battery's state of charge has a significant impact on the current growth rate. At this time, the battery's state of charge can be monitored in real time, and different current growth strategies can be adopted according to different state of charge ranges. For example: when the battery's state of charge is low, in order to speed up the charging process, the current growth rate can be appropriately increased; when the battery's state of charge is within the normal range, the current maintains a constant growth rate and charges the battery at a stable rate; when the battery's state of charge is high, in order to ensure charging stability and safety and avoid overcharging and heating of the battery, the current growth rate can be slowed down.

[0084] 209. When the real-time voltage of the battery reaches the constant voltage charging voltage threshold, a curve deviation value between the current charging curve and the preset charging curve is calculated using a dynamic time warping algorithm;

[0085] 210. Determine the current internal state of the battery based on electrochemical impedance spectroscopy data;

[0086] 211. Assign different weights to the curve deviation value and the current internal state, and calculate the comprehensive score;

[0087] Optionally, in this embodiment, when the battery's real-time voltage reaches the constant-voltage charging threshold, the need to enter the constant-voltage charging phase can be further determined based on the curve deviation between the current charging curve and the preset charging curve, as well as the battery's current internal state. This improves the reliability of charging phase switching and thus further increases the battery's service life. Specifically, the voltage-time data series collected during the actual charging process and the preset charging curve data series are first preprocessed through data smoothing and normalization to eliminate the effects of data noise and dimensional differences. The Euclidean distance between the two curves is then calculated to measure their similarity and obtain a curve deviation value. During this calculation, a dynamic programming algorithm can be used to find the optimal matching path between the two curves, minimizing the sum of the distances between corresponding points on the path. If the calculated curve deviation value is large, it indicates that the actual charging process differs significantly from the standard charging process. This difference may be due to individual battery differences, varying degrees of aging, or changes in environmental factors. In this case, even if the battery's real-time voltage has not yet reached the constant-voltage charging threshold, the phase transition can be advanced or delayed based on actual conditions. For example, if the voltage of the current charging curve rises significantly faster than the preset charging curve, it may indicate that the chemical reaction activity within the battery is high. To prevent overcharging, the constant current voltage charging phase can be switched earlier. Conversely, if the voltage rises slowly, the switching can be appropriately delayed to ensure that the battery can be fully charged. Therefore, the curve deviation between the current charging curve and the preset charging curve can be used as one of the factors affecting the switching of the constant current voltage charging phase.

[0088] After obtaining the curve deviation value between the current charging curve and the preset charging curve, the electrochemical impedance spectroscopy data is fitted using the complex nonlinear least squares method to obtain the equivalent circuit model parameters of the battery, such as charge transfer resistance, diffusion impedance, double layer capacitance, etc. These parameters can reflect the charge transfer process, ion diffusion process and electrode-electrolyte interface characteristics inside the battery, so that the current internal state of the battery can be determined. When the current internal state of the battery reaches a certain level, it triggers the conversion from constant current charging to constant voltage charging. For example, as charging proceeds, the charge transfer resistance of the battery will gradually increase. When the charge transfer resistance increases to 1.5 times the initial value, it indicates that the charge transfer process inside the battery is significantly hindered and the polarization phenomenon is aggravated. At this time, even if the real-time voltage does not reach the constant voltage charging voltage threshold, the conversion can be started in advance. Therefore, the current internal state of the battery can also be used as one of the influencing factors for switching the constant voltage charging stage. After obtaining the curve deviation value and the current internal state degree, different weights are assigned to the curve deviation value and the current internal state degree respectively, and after summing them up, a comprehensive score is calculated. When the comprehensive score reaches the preset score value, it can be determined that the constant voltage charging stage can be switched.

[0089] 212. When the comprehensive score reaches a preset score value, a pulse current is applied to the battery;

[0090] 213. Adjust the pulse parameters of the pulse current in real time according to the state of charge and real-time temperature of the battery, the pulse parameters including frequency, duty cycle and amplitude;

[0091] 214. Reducing the charging current based on the real-time change of the pulse parameters to switch the current charging state of the battery to a constant voltage charging stage, wherein the constant voltage charging voltage threshold is greater than the constant current charging voltage threshold;

[0092] Optionally, in this embodiment, current pulse optimization technology can be used to control the reduction process of the charging current. Pulse current can effectively reduce the charging current by adjusting its own parameters. Its core principle is to optimize the battery charging process by utilizing the periodic variation of pulse current to prevent damage to the battery caused by excessive charging current. Specifically, by applying a series of pulse currents to the battery and varying pulse parameters such as the frequency, duty cycle, and amplitude of the pulse current, the charging current during constant voltage charging can be reduced. When the battery's state of charge is low, the pulse current frequency can be increased to speed up charging. When the battery's real-time temperature is high, the pulse current amplitude and duty cycle can be reduced to reduce battery heating. With the pulse current, the charging current can be more accurately adjusted to the battery's state, extending the battery's service life while ensuring that the battery is fully charged. For example, for batteries with advanced age, the pulse current frequency can be reduced to prevent damage caused by high-frequency pulses. Simultaneously, by adjusting the pulse current, the charging current is gradually reduced, allowing the battery to complete the charging process smoothly.

[0093] 215. When the battery capacity of the battery reaches a preset full load threshold, the charging current is adjusted to within a trickle charging current range to switch to a trickle charging stage;

[0094] 216. Determine whether the battery is in an overcurrent state or an overvoltage state based on the real-time voltage, real-time current, and real-time temperature of the battery. If so, execute step 217.

[0095] 217. Trigger a charging protection action, which is used to cut off the charging process of the battery or reduce the charging current.

[0096] Optionally, in this embodiment, the battery's real-time voltage, real-time current, and real-time temperature can be monitored in real time during all charging stages. The battery's overcurrent or overvoltage condition can be determined by determining whether these conditions meet preset safety conditions. If an overcurrent or overvoltage condition is determined, the battery's charging process can be interrupted or the charging current can be reduced to quickly drop to a safe range, thereby preventing battery performance degradation or safety incidents caused by abnormal conditions.

[0097] See also Figure 3 As shown, an embodiment of the adaptive mobile device fast charging protection system in this application includes:

[0098] An acquisition unit 301 is used to acquire electrochemical impedance spectroscopy data of the battery. The electrochemical impedance spectroscopy data is used to evaluate the aging degree of the battery in combination with the cycle number and capacity attenuation factor of the battery.

[0099] a first determining unit 302, configured to determine a charging current in a pre-charging stage according to an aging evaluation result of the battery, and pre-charge the battery based on the charging current;

[0100] A first adjusting unit 303 is configured to adjust the charging current according to the real-time temperature of the battery to switch to the constant current charging stage when the real-time voltage of the battery reaches the constant current charging voltage threshold;

[0101] The second adjustment unit 304 is configured to adjust the charging current by secondary current pulse optimization to switch to the constant voltage charging stage when the real-time voltage of the battery reaches a constant voltage charging voltage threshold, wherein the constant voltage charging voltage threshold is greater than the constant current charging voltage threshold;

[0102] The third adjusting unit 305 is configured to adjust the charging current to a trickle charging current range to switch to a trickle charging stage when the battery capacity of the battery reaches a preset full load threshold.

[0103] In this embodiment, the acquisition unit 301 acquires the electrochemical impedance spectroscopy data of the battery, which is used to combine with the number of battery cycles and the capacity attenuation factor to assess the degree of battery aging; the first determination unit 302 determines the charging current in the pre-charging stage according to the battery aging assessment result, and pre-charges the battery based on the charging current; when the real-time voltage of the battery reaches the constant current charging voltage threshold, the first adjustment unit 303 adjusts the charging current according to the real-time temperature of the battery to switch to the constant current charging stage; when the real-time voltage of the battery reaches the constant voltage charging voltage threshold, the second adjustment unit 304 adjusts the charging current secondary through current pulse optimization to switch to the constant voltage charging stage, and the constant voltage charging voltage threshold is greater than the constant current charging voltage threshold; when the battery capacity of the battery reaches the preset full load threshold, the third adjustment unit 305 adjusts the charging current to within the trickle charging current range to switch to the trickle charging stage. In this way, the degree of battery aging can be accurately assessed by combining the electrochemical impedance spectroscopy data, the number of battery cycles, and the capacity attenuation factor, providing a reliable basis for subsequent charging strategy adjustments. Based on factors such as the battery's aging degree, real-time voltage, and real-time temperature, the charging current and charging stage are adaptively adjusted to achieve fast charging while effectively protecting the battery and extending its service life.

[0104] See also Figure 4 As shown, another embodiment of the adaptive mobile device fast charging protection system in the present application includes:

[0105] An acquisition unit 401 is used to acquire electrochemical impedance spectroscopy data of the battery. The electrochemical impedance spectroscopy data is used to evaluate the aging degree of the battery in combination with the cycle number and capacity attenuation factor of the battery.

[0106] The first determining unit 402 is specifically configured to obtain battery attributes, including battery type and battery capacity range; obtain an initial current that matches the battery attributes and aging assessment results from a preset charging ratio database; and correct the initial current based on the real-time temperature of the battery to obtain a charging current for a pre-charging phase.

[0107] The first adjustment unit 403 is configured to calculate a current temperature deviation between the real-time temperature of the battery and the target temperature when the real-time voltage of the battery reaches a constant current charging voltage threshold; perform a PID operation on the current temperature deviation to obtain a current adjustment value; sum the current adjustment value with the charging current to obtain a constant current charging current; and charge the battery based on the constant current charging current to switch the current charging state of the battery to a constant current charging stage;

[0108] A first calculation unit 404 is configured to calculate a curve deviation between a current charging curve and a preset charging curve using a dynamic time warping algorithm when the real-time voltage of the battery reaches a constant voltage charging voltage threshold;

[0109] A second determining unit 405 is configured to determine the current internal state of the battery based on the electrochemical impedance spectroscopy data;

[0110] The second calculation unit 406 is used to assign different weights to the curve deviation value and the current internal state degree respectively, and calculate a comprehensive score;

[0111] The second adjustment unit 407 is specifically configured to apply a pulse current to the battery when the comprehensive score reaches a preset score value; adjust pulse parameters of the pulse current in real time according to the state of charge and real-time temperature of the battery, the pulse parameters including frequency, duty cycle, and amplitude; and reduce the charging current based on the real-time changes in the pulse parameters to switch the current charging state of the battery to a constant voltage charging stage;

[0112] The third adjusting unit 408 is configured to adjust the charging current to a trickle charging current range to switch to a trickle charging stage when the battery capacity of the battery reaches a preset full load threshold;

[0113] A judgment unit 409 is used to judge whether the battery is in an overcurrent state or an overvoltage state according to the real-time voltage, real-time current and real-time temperature of the battery;

[0114] The trigger unit 410 is used to trigger a charging protection action when the battery is in an overcurrent state or an overvoltage state. The charging protection action is used to cut off the charging process of the battery or reduce the charging current.

[0115] In this embodiment, the functions of each unit are the same as those described above. Figure 2-1 and Figure 2-2 The functions of steps 201 to 217 in the illustrated embodiment are similar and will not be described again here.

[0116] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0117] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0118] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0119] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0120] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, read-only memory), random access memory (RAM, random access memory), disk or optical disk, and other media that can store program code.

Claims

1. An adaptive fast charging protection method for mobile devices, characterized in that: include: Acquiring electrochemical impedance spectroscopy data of a battery, wherein the electrochemical impedance spectroscopy data is used to evaluate the aging degree of the battery in combination with the cycle number and capacity attenuation factor of the battery; determining a charging current in a pre-charging stage according to an aging evaluation result of the battery, and pre-charging the battery based on the charging current; When the real-time voltage of the battery reaches a constant current charging voltage threshold, adjusting the charging current according to the real-time temperature of the battery to switch to a constant current charging stage; When the real-time voltage of the battery reaches the constant voltage charging voltage threshold, a curve deviation value between the current charging curve and the preset charging curve is calculated using a dynamic time warping algorithm; determining a current internal state of the battery based on the electrochemical impedance spectroscopy data; Assign different weights to the curve deviation value and the current internal state degree respectively, and calculate a comprehensive score; When the comprehensive score reaches a preset score value, the charging current is adjusted secondary through current pulse optimization to switch to a constant voltage charging stage, and the constant voltage charging voltage threshold is greater than the constant current charging voltage threshold; When the battery capacity of the battery reaches a preset full-load threshold, the charging current is adjusted to a trickle charging current range to switch to a trickle charging stage.

2. The adaptive mobile device fast charging protection method according to claim 1, characterized in that: After adjusting the charging current to within the trickle charging current range to switch to the trickle charging stage, the method further includes: determining whether the battery is in an overcurrent state or an overvoltage state according to the real-time voltage, real-time current, and real-time temperature of the battery; If so, a charging protection action is triggered, and the charging protection action is used to cut off the charging process of the battery or reduce the charging current.

3. The adaptive fast charging protection method for mobile devices according to claim 1, characterized in that: The step of determining the charging current in the pre-charging stage according to the battery aging evaluation result includes: Acquire battery attributes of the battery, where the battery attributes include battery type and battery capacity range; Obtaining an initial current that matches the battery properties and aging assessment result from a preset charging ratio database; The initial current is corrected according to the real-time temperature of the battery to obtain the charging current in the pre-charging stage.

4. The adaptive fast charging protection method for mobile devices according to claim 1, characterized in that: The step of adjusting the charging current according to the real-time temperature of the battery to switch to the constant current charging stage includes: Calculating a current temperature deviation between the real-time temperature of the battery and a target temperature; Performing PID calculation on the current temperature deviation to obtain a current adjustment value; Summing the current adjustment value and the charging current to obtain a constant current charging current; The battery is charged based on the constant current charging current to switch the current charging state of the battery to a constant current charging stage.

5. The adaptive fast charging protection method for mobile devices according to claim 1, characterized in that: The second adjustment of the charging current by current pulse optimization to switch to the constant voltage charging stage includes: applying a pulse current to the battery; adjusting the pulse parameters of the pulse current in real time according to the state of charge and real-time temperature of the battery, the pulse parameters including frequency, duty cycle and amplitude; The charging current is reduced based on the real-time change of the pulse parameters to switch the current charging state of the battery to a constant voltage charging stage.

6. An adaptive mobile device fast charging protection system, characterized in that: include: an acquisition unit, configured to acquire electrochemical impedance spectroscopy data of a battery, wherein the electrochemical impedance spectroscopy data is used to be combined with the cycle number and capacity attenuation factor of the battery to evaluate the aging degree of the battery; a first determining unit, configured to determine a charging current in a pre-charging stage according to an aging evaluation result of the battery, and pre-charge the battery based on the charging current; a first adjusting unit, configured to adjust the charging current according to the real-time temperature of the battery to switch to a constant current charging stage when the real-time voltage of the battery reaches a constant current charging voltage threshold; a second adjustment unit, configured to calculate a curve deviation value between a current charging curve and a preset charging curve using a dynamic time warping algorithm when the real-time voltage of the battery reaches a constant voltage charging voltage threshold; determining the current internal state of the battery according to the electrochemical impedance spectroscopy data; assigning different weights to the curve deviation value and the current internal state, respectively, and calculating a comprehensive score; When the comprehensive score reaches a preset score value, the charging current is secondary adjusted through current pulse optimization to switch to a constant voltage charging stage, and the constant voltage charging voltage threshold is greater than the constant current charging voltage threshold; The third adjusting unit is configured to adjust the charging current to a trickle charging current range to switch to a trickle charging stage when the battery capacity of the battery reaches a preset full load threshold.

7. The adaptive mobile device fast charging protection system according to claim 6, characterized in that: The system further comprises: a judging unit, configured to judge whether the battery is in an overcurrent state or an overvoltage state according to the real-time voltage, real-time current, and real-time temperature of the battery; The trigger unit is used to trigger a charging protection action when the battery is in an overcurrent state or an overvoltage state, and the charging protection action is used to cut off the charging process of the battery or reduce the charging current.

8. The adaptive mobile device fast charging protection system according to claim 6, characterized in that: The first determining unit is specifically configured to: Acquire battery attributes of the battery, where the battery attributes include battery type and battery capacity range; Obtaining an initial current that matches the battery properties and aging assessment result from a preset charging ratio database; The initial current is corrected according to the real-time temperature of the battery to obtain the charging current in the pre-charging stage.

9. The adaptive mobile device fast charging protection system according to claim 6, characterized in that: The first adjustment unit is specifically configured to: Calculating a current temperature deviation between the real-time temperature of the battery and a target temperature; Performing PID calculation on the current temperature deviation to obtain a current adjustment value; Summing the current adjustment value and the charging current to obtain a constant current charging current; The battery is charged based on the constant current charging current to switch the current charging state of the battery to a constant current charging stage.

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