Fast charging method and electronic device, readable storage medium

Abstract

The application discloses a fast charging method and electronic equipment and a readable storage medium, and belongs to the technical field of communication. The method comprises the following steps: detecting the voltage and current of an electric core to obtain a detection result; determining a first charging current according to the detection result; and providing the first charging current to the electric core by a charging module; wherein the electric core comprises a plurality of electric core threshold voltages, which correspond to a plurality of different preset maximum chargeable currents respectively; the first charging current is used to make the electric core reach a first charging voltage within at least one period; the first charging voltage does not exceed the target electric core threshold voltage corresponding to the electric core before the charging module is powered; and the period corresponds to the time from the detection result to the time when the charging module provides the first charging current.

Description

Technical Field

[0001] This application belongs to the field of communication technology, specifically relating to a fast charging method, an electronic device, and a readable storage medium. Background Technology

[0002] More and more electronic devices now support fast charging. After fast charging is enabled, the fuel gauge detects the cell voltage and informs the electronic device's processing system. The processing system then instructs the fast charging module to perform constant current charging based on the cell voltage. The fast charging module, based on multiple cell threshold voltages corresponding to the cell, first performs stepped constant current charging, and finally constant voltage charging. The cell threshold voltages are pre-designed according to the cell's capabilities; each cell threshold voltage corresponds to a pre-defined maximum chargeable current.

[0003] During stepped constant current charging, the maximum rechargeable current needs to be adjusted according to the cell voltage. However, the time required from the fuel gauge detecting the cell voltage to the fast charging module adjusting the maximum rechargeable current and starting charging is on the order of seconds. Thus, each time an external fast charger is plugged in for fast charging at the target maximum rechargeable current, the cell may experience a high voltage exceeding the cell threshold voltage corresponding to the target maximum rechargeable current within a few seconds. As the charging power increases, the charging current becomes very large, leading to very high cell voltages, exacerbating battery safety and the voltage withstand risks to other system components. Summary of the Invention

[0004] The purpose of this application is to provide a fast charging method, an electronic device, and a readable storage medium that can solve the risks to battery safety and the withstand voltage of other system components.

[0005] In a first aspect, embodiments of this application provide a fast charging method, the method comprising:

[0006] The voltage and current of the battery cell are measured to obtain the test results;

[0007] Based on the detection results, the first charging current is determined;

[0008] The charging module provides the first charging current to the battery cell;

[0009] The battery cell includes multiple cell threshold voltages, each corresponding to a different preset maximum rechargeable current; the first charging current is used to enable the battery cell to reach a first charging voltage within at least one cycle; the first charging voltage does not exceed the target cell threshold voltage corresponding to the battery cell before the charging module supplies power; the cycle corresponds to the time from the detection result to the charging module providing the first charging current.

[0010] In a second aspect, embodiments of this application provide an electronic device including a processor and a memory, wherein the memory stores programs or instructions executable on the processor, and the programs or instructions, when executed by the processor, implement the steps of the method described in the first aspect.

[0011] Thirdly, embodiments of this application provide a readable storage medium on which a program or instructions are stored, which, when executed by a processor, implement the steps of the method described in the first aspect.

[0012] Fourthly, embodiments of this application provide a chip, the chip including a processor and a communication interface, the communication interface being coupled to the processor, the processor being used to run programs or instructions to implement the method as described in the first aspect.

[0013] Fifthly, embodiments of this application provide a computer program product stored in a storage medium, which is executed by at least one processor to implement the method described in the first aspect.

[0014] In this embodiment, the voltage and current of the battery cell are detected to obtain the detection results. Based on the detection results, a first charging current is determined and provided to the battery cell by the charging module. The first charging current ensures that the first charging voltage reached by the battery cell within at least one cycle does not exceed the battery cell threshold voltage before the charging module supplies power. This provides a safer and more precise fast charging control, ensuring that the voltage of the battery cell does not exceed the battery cell's specified threshold voltage and the withstand voltage of other system components during fast charging. It avoids the risk to battery safety and the withstand voltage of other system components caused by the second-level high voltage of the battery cell when the charger is plugged in for fast charging, especially after the battery cell has aged. Attached Figure Description

[0015] Figure 1 This is a flowchart illustrating the fast charging method according to an embodiment of this application.

[0016] Figure 2 This application illustrates the application scenario of the fast charging method according to an embodiment of the present application.

[0017] Figure 3 This is a flowchart illustrating the fast charging method according to the first embodiment of this application.

[0018] Figure 4 This is a schematic diagram of the equivalent circuit of the battery cell in an embodiment of this application.

[0019] Figure 5 This is a schematic diagram of the current-voltage change of the fast charging method according to the first embodiment of this application.

[0020] Figure 6This is a flowchart illustrating the fast charging method according to the second embodiment of this application.

[0021] Figure 7 This is a schematic diagram of the current-voltage change of the fast charging method according to the second embodiment of this application.

[0022] Figure 8 This is a structural block diagram of an electronic device according to an embodiment of this application.

[0023] Figure 9 This is a schematic diagram of the hardware structure of an electronic device that implements an embodiment of this application. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0025] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0026] The fast charging method provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0027] Figure 1 This is a flowchart illustrating the fast charging method according to an embodiment of this application. Figure 2 This application illustrates the application scenario of the fast charging method according to an embodiment of the present application.

[0028] like Figure 1 As shown, the fast charging method of this application embodiment includes the following:

[0029] Step 102: Detect the voltage and current of the battery cell to obtain the detection results.

[0030] Step 104: Determine the first charging current based on the detection results;

[0031] Step 106: The charging module provides the first charging current to the battery cell;

[0032] The battery cell includes multiple cell threshold voltages, each corresponding to a different preset maximum rechargeable current; the first charging current is used to enable the battery cell to reach a first charging voltage within at least one cycle; the first charging voltage does not exceed the target cell threshold voltage corresponding to the battery cell before the charging module supplies power; the cycle corresponds to the time from the detection result to the charging module providing the first charging current.

[0033] The fast charging method of this application embodiment can be applied to an electronic device including a rechargeable battery and executed by a processor in the system 10 of the electronic device. The rechargeable battery includes a cell 20.

[0034] In step 102, when the system 10 detects that a standard charger, such as a fast charger, has been inserted and the fast charging mode has been activated, the charging module is started, that is... Figure 2 The fast charging module 40 and the fuel gauge 50 connected to the positive and negative terminals of the battery cell 20 detect the voltage and current of the battery cell 20. The fuel gauge 50 is connected to the processor of the system 10, so that it can inform the system 10 of the detected voltage and current of the battery cell 20. The system 10 obtains the detection result through the voltage and current of the battery cell 20 detected by the fuel gauge 50.

[0035] When system 10 detects that a standard charger has been inserted and the normal charging mode has been activated, the normal charging module is started. This application embodiment mainly describes the charging method of the fast charging module 40 corresponding to the fast charging mode. In one example, system 10 can communicate with the fast charging module 40 and the fuel gauge 50 via the I2C bus.

[0036] In step 104, based on the detected voltage and current of the battery cell 20, a first charging current for constant current (CC) charging of the battery cell 20 is determined. This first charging current is the current used by the fast charging module 40 to charge the battery cell 20 at a constant current after the fast charger is detected being plugged in. That is, the first charging current is the initial step constant current of the fast charging module 40 for step constant current charging, and it is the maximum step constant current. Subsequently, during the step constant current charging process, the fuel gauge 50 continuously detects the voltage and current of the battery cell 20 and feeds it back to the system 10. The system 10 informs the fast charging module 40, and finally, the fast charging module 40 adjusts the current first charging current for constant current charging of the battery cell 20.

[0037] The time from the detection result of the fuel gauge 50 to the provision of the first constant charging current by the fast charging module 40 corresponds to one cycle, and the closed-loop control corresponding to this cycle requires a time on the order of seconds. Thus, every time a fast charger is plugged in for fast charging, the battery cell 20 may experience a high voltage within a few seconds, which far exceeds the cell threshold voltage corresponding to the maximum chargeable current allowed by the design capability of the battery cell 20.

[0038] Cell 20 has multiple cell threshold voltages. During staged constant current charging, based on the current cell threshold voltage of cell 20, the maximum rechargeable current allowed by the design capability corresponding to the current cell threshold voltage is used for stepped constant current charging, and finally constant voltage charging is performed.

[0039] For example, the relationship between the cell threshold voltage and the corresponding maximum rechargeable current of cell 20 is as follows: constant current charging to 4.15V with a maximum rechargeable current of 20A, constant current charging to 4.19V with a maximum rechargeable current of 14A, constant current charging to 4.43V with a maximum rechargeable current of 10A, constant current charging to 4.5V with a maximum rechargeable current of 8A, and finally, constant voltage charging to 2.5A.

[0040] As charging power increases, the charging current becomes very large, which can cause the cell voltage to rise significantly within a cycle, exacerbating the voltage withstand risk to the battery and other system components.

[0041] In this embodiment, the first charging current is used to bring the battery cell 20 to a first charging voltage within at least one cycle. The first charging voltage reached does not exceed the target battery cell threshold voltage corresponding to the battery cell before the fast charging module 40 supplies power. The target battery cell threshold voltage corresponding to the battery cell before the fast charging module 40 supplies power is the initial voltage of the battery cell 20 before it is inserted into the fast charger for fast charging. This initial voltage may be less than the minimum voltage among multiple battery cell threshold voltages, may be between any two adjacent battery cell threshold voltages, or may be greater than the maximum voltage among multiple battery cell threshold voltages.

[0042] Different initial voltages of battery cells result in different cell threshold voltages, thus requiring different preset maximum chargeable currents for constant current charging.

[0043] In one embodiment, the first charging current for constant current charging of the battery cell 10 is obtained by incrementally increasing the current.

[0044] Specifically, determining the first charging current based on the detection result includes: acquiring the initial voltage of the battery cell detected before the charging module supplies power; determining the target battery cell threshold voltage corresponding to the battery cell based on the initial voltage; controlling the charging module to increase the current step by step from zero at preset current intervals to obtain a second charging current and supply power to the battery cell; acquiring the detection result; and, based on the detection result, if the second charging current causes the charging voltage that the battery cell can reach to be less than the target battery cell threshold voltage, using the second charging current as the first charging current.

[0045] In this embodiment, when a fast charger is inserted for fast charging, the fuel gauge 50 detects that the voltage of the battery cell 20 is the initial voltage before the fast charger was inserted, for example, 4V. The multiple cell threshold voltages of the battery cell 20 are 4.15V corresponding to a maximum charging current of 20A, 4.19V corresponding to a maximum charging current of 14A, 4.43V corresponding to a maximum charging current of 10A, and 4.5V corresponding to a maximum charging current of 8A.

[0046] Based on the initial voltage of 4V of cell 20, the minimum cell threshold voltage of 4.15V that cell 20 needs to be fast charged to reach is obtained.

[0047] In this embodiment, the fast charging module 40 does not fast charge the battery cell 20 according to the maximum rechargeable current of 20A corresponding to the conventional battery cell threshold voltage of 4.15V. Instead, the system 10 controls the fast charging module 40 to increase the constant current charging the battery cell 20 in preset current intervals from zero to obtain the second charging current.

[0048] Optionally, the preset current interval is 1-2A. That is, the system 10 controls the fast charging module 40 to increase by 1-2A as the second charging current within one cycle. With a preset current interval of 1A, starting from the initial first cycle, a constant charging current is obtained by stepping in the form of 1A, 2A, 3A... to charge the battery cell 20. Furthermore, in each cycle, the voltage and current of the battery cell 20 are detected in real time by the fuel gauge 50 during the fast charging process with the second charging current. If the current second charging current causes the charging voltage that the battery cell 20 can reach to still be less than the aforementioned battery cell threshold voltage of 4.15V, then in the next cycle, the second charging current is increased by 1A and used as the first charging current to fast charge the battery cell 20.

[0049] In this way, the first charging current gradually increases in each cycle to reach the first charging voltage of cell 20. Within each cycle, the first charging voltage of cell 20 does not exceed the cell threshold voltage of 4.15V corresponding to the initial cell voltage of 4V before the fast charging module 40 supplies power. Therefore, by achieving a constant current for fast charging cell 20 through this step-by-step increase, it is possible to avoid the cell 20 experiencing a high voltage exceeding its corresponding cell threshold voltage within seconds each time it is plugged into the fast charger for fast charging. This ensures battery safety and also avoids the risk of damage to other components due to voltage exceeding their withstand voltage.

[0050] During the aforementioned process of increasing the first charging current in steps for fast charging, after multiple intervals of increasing the charging current, it is possible that the second charging current of the current cycle will be used for charging, preventing the charging voltage of cell 20 from falling below the target cell threshold voltage. However, in the next cycle, after increasing the second charging current of the previous cycle by 1A and using it as the first charging current to fast charge cell 20, it will detect that the voltage of cell 20 exceeds the target cell threshold voltage. At this point, to avoid damaging the cell, the step-by-step increase in charging current for cell 20 is stopped. Instead, a preset amount is reduced from the current second charging current to obtain the first charging current used for fast charging cell 20, ensuring that the voltage of cell 20 does not exceed the target cell threshold voltage.

[0051] Optionally, determining the first charging current based on the detection result further includes: based on the detection result, if the second charging current makes the charging voltage that the cell can reach not less than the target cell threshold voltage, reducing the second charging current by a preset amount to obtain the first charging current.

[0052] The fast charging method of this embodiment of the application is referred to... Figure 3 .like Figure 3 As shown, it includes the following steps:

[0053] Step 202, plug in the charger;

[0054] Step 204: System 10 determines whether it is a fast charger. If yes (Y), proceed to step 206; if no (N), proceed to step 216.

[0055] Step 206: The fuel gauge 50 detects the voltage of the battery cell 20;

[0056] Step 208: System 10 reads the voltage of cell 20 through fuel gauge 50;

[0057] Step 210: System 10 instructs the charging module to enable fast charging and gradually increases the charging current.

[0058] Step 212: The system 10 periodically reads the fuel gauge 50 and obtains the voltage of the battery cell 20;

[0059] Step 214: When the system 10 detects that the voltage of the battery cell 20 has reached the corresponding battery cell threshold voltage, it informs the charging module to adjust the constant current charging current and returns to step 212.

[0060] Step 216: The charging module charges the battery cell 20 using a standard charging method.

[0061] In this embodiment, after the fast charger is inserted, the charging current of the fast charging module 40 is increased step by step during charging. The voltage of the battery cell 20 can be monitored in each step time period. After a closed-loop control is performed, the charging current is reduced in small steps after the target battery cell threshold voltage is detected to ensure that the voltage does not exceed the battery cell specifications.

[0062] Optionally, the preset size is 20%-30% of the preset current interval. Taking a preset current interval of 1A and a preset size of 20% of the preset current interval as an example, after detecting that the target cell threshold voltage has been reached, the charging current can be reduced by 0.2A based on the first charging current of the previous cycle, so that the fast charging module 40 needs to provide the first charging current for fast charging of the cell 20 in the current cycle.

[0063] according to Figure 4 From the equivalent circuit of cell 20, we know that Uc = Uo + I*Rc, where Uc represents the cell voltage, Uo represents the initial voltage of the cell, I represents the charging current, and Rc represents the initial internal resistance of the cell.

[0064] Assuming the initial voltage of cell 20 is 4V and the initial internal resistance is 15mohm, after the fast charger is plugged in, the fuel gauge 50 detects that the initial voltage of cell 20 is 4V<4.15V. The system 10 reads this and tells the fast charging module 40 to start fast charging, and to gradually increase the charging current from zero in 1A current intervals.

[0065] like Figure 5 The diagram illustrates the changes in the fast charging current and voltage of cell 20 during fast charging. The charging current increases in steps from zero, and the corresponding voltage of cell 20 also increases accordingly.

[0066] Based on Uc = 4 + 10 * 15 = 4.15V, theoretically, when the charging current is stepped up to 10A, the cell voltage Uc = 4.15V will be detected, which means it has reached one of the cell threshold voltages of cell 20, 4.15V. At this point, the current can be reduced by 200mA from 10A, using 9.8A as the first charging current. Uc = 4V + 9.8A * 15mohm = 4.147V, which will not exceed the cell threshold voltage of 4.15V.

[0067] like Figure 5 As shown, when the voltage of cell 20 exceeds the cell threshold voltage of 4.15V, the charging current can be gradually reduced for stepped fast charging, or it can be directly reduced to the corresponding preset maximum charging current before being used for stepped fast charging.

[0068] Optionally, the method further includes: acquiring the detection result during the process of the charging module providing the first charging current to the battery cell; and, based on the detection result, reducing the first charging current to a first preset maximum rechargeable current when the charging voltage that the battery cell can reach is greater than the target battery cell threshold voltage due to the first charging current, wherein the first preset maximum rechargeable current is the maximum value among the plurality of different preset maximum rechargeable currents that are less than the first charging current.

[0069] Assuming the current charging current is 9.8A, if the cell voltage exceeds 4.15V in the next cycle, the fast charging module 40 needs to select a maximum charging current less than 9.8A corresponding to the cell threshold voltage of 4.5V. For example, if the maximum charging current corresponding to a cell threshold voltage of 4.15V is 20A, 4.19V is 14A, 4.43V is 10A, and 4.5V is 8A, then the maximum charging current less than 9.8A needs to be selected, i.e., constant current fast charging at 8A.

[0070] When performing constant current fast charging at 8A, step adjustment is not required; the battery cell 20 can be directly fast charged at a constant current of 8A. Taking the maximum rechargeable current corresponding to 8A as an example, after charging to 4.5V with constant current, and then charging to 2.5A with constant voltage, when the voltage of battery cell 20 reaches the battery cell threshold voltage of 4.5V due to the detection of constant current charging at 8A, constant voltage charging of battery cell 20 will be used.

[0071] When a battery cell ages, for example, if its internal resistance increases to 40 mohm, and a fast charger is plugged in and fast charging is started, when the initial voltage of the battery cell (corresponding to the cell threshold voltage of 4.15V) is reached, then Uc = (4.15V - 4V) / 40 mohm = 3.75A. Theoretically, when the charging current rises to 4A, Uc = 4V + 4A * 40 mohm = 4.16V, which exceeds the cell threshold voltage of 4.15V. At this point, the charging current will stop increasing. Even if a small charging current exceeds the cell threshold voltage, the slight voltage excess will not cause significant damage to the safety of the battery cell or the voltage withstand capability of other components in the system.

[0072] In another embodiment, the first charging current for constant current charging of the battery cell 10 is obtained by calculating the maximum charging current corresponding to the battery cell 10 not exceeding the battery cell threshold voltage. Thus, the battery cell 10 can jump to the battery cell threshold voltage within one cycle.

[0073] Specifically, determining the first charging current based on the detection result includes: acquiring the initial voltage of the battery cell detected before the charging module supplies power; determining the target battery cell threshold voltage corresponding to the battery cell based on the initial voltage; determining the internal resistance of the battery cell; determining the first maximum rechargeable current corresponding to the battery cell based on the initial voltage, the target battery cell threshold voltage, and the internal resistance of the battery cell; and determining the first charging current based on the smaller of the first maximum rechargeable current and the preset maximum rechargeable current corresponding to the target battery cell threshold voltage.

[0074] In this embodiment, when a fast charger is inserted for fast charging, the initial voltage before the charging module supplies power, i.e., the voltage of cell 20 detected by the fuel gauge 50 before the fast charger is inserted, is, for example, 4V. If the multiple cell threshold voltages of cell 20 are 4.15V corresponding to a maximum charging current of 20A, 4.19V corresponding to a maximum charging current of 14A, 4.43V corresponding to a maximum charging current of 10A, and 4.5V corresponding to a maximum charging current of 8A, then based on the initial voltage of cell 20 of 4V, the minimum cell threshold voltage of 4.15V that cell 20 needs to be boosted to during fast charging is obtained.

[0075] Then, by determining the current internal resistance of the battery cell 20, the charging current that allows the battery cell to reach a voltage that does not exceed the target battery cell threshold voltage corresponding to the initial voltage of the battery cell 20 before it is plugged into the fast charger can be calculated.

[0076] As described above, the multiple cell threshold voltages included in cell 20 each correspond to a preset maximum rechargeable current. In this embodiment, the first maximum rechargeable current corresponding to cell 20 can be calculated based on the initial voltage of cell 20, the cell threshold voltage corresponding to the initial voltage, and the internal resistance of the cell.

[0077] Therefore, before determining the first maximum rechargeable current corresponding to cell 20, the internal resistance of cell 20 should be determined first.

[0078] Specifically, determining the internal resistance of the battery cell includes: acquiring a first voltage and a first current of the battery cell when the charging module supplies power to both the battery cell and the system load simultaneously; acquiring a second voltage and a second current of the battery cell when the charging module supplies power only to the system module, wherein the second voltage is equal to the initial voltage; and determining the internal resistance of the battery cell based on the first voltage, the first current, the second voltage, and the second current.

[0079] Assuming the current internal resistance of cell 20 is Rc and the initial voltage is 4V, after plugging in the fast charger, the fast charging module 40 simultaneously supplies power to both cell 20 and the load of system 10. The fuel gauge 50 can detect the first voltage U1 and the first current I1 of cell 20. Based on the initial voltage of 4V, the corresponding cell threshold voltage can be determined to be 4.15V, and the maximum charging current Ic corresponding to this cell threshold voltage is 20A.

[0080] When the fast charging module 40 is configured to supply power only to the load of system 10 and not to the battery cell 20, the fuel gauge 50 detects the second voltage U2 and the second current I2 of the battery cell 20, where the second current I2 is 0. The second voltage U2 is also... Figure 3 The initial voltage U of the cell 20 shown O .

[0081] Specifically, determining the internal resistance of the battery cell based on the first voltage, the first current, the second voltage, and the second current includes: determining the internal resistance of the battery cell according to the following formula, Rc=(U2-U1) / (I2-I1); where Rc represents the internal resistance of the battery cell, U1 represents the first voltage, I1 represents the first current, U2 represents the second voltage, and I2 represents the second current.

[0082] According to the formula Rc=(U2-U1) / (I2-I1), the internal resistance of cell 20 can be calculated. Then, the first maximum rechargeable current of cell 20 can be determined based on the initial voltage of cell 20, the cell threshold voltage corresponding to the initial voltage, and the internal resistance.

[0083] Specifically, the first maximum rechargeable current corresponding to the battery cell is determined based on the initial voltage, the target cell threshold voltage, and the internal resistance of the battery cell, including: determining the first maximum rechargeable current according to the following formula, Imax=(Uc-U2) / Rc; where Imax represents the first maximum rechargeable current and Uc represents the target cell threshold voltage.

[0084] As mentioned above, U2 = U O , then Imax=(Uc-U O ) / Rc. Corresponding Figure 3 As can be seen from the equivalent circuit of cell 20, Imax is the current flowing through the internal resistance Rc.

[0085] Assuming the initial internal resistance Rc of cell 20 is calculated to be ~15mohm, the next step is to calculate the maximum rechargeable current Imax = (4.15-4) / 15mohm = 10A, which is the cell voltage threshold of 4.15V corresponding to the initial voltage of 4V. Taking the smaller value of Imax (10A) and Ic (20A) as 10A, the system 10 notifies the fast charging module 40 to charge at the smaller value of 10A. Then Uc = 4V + 10A * 15mohm = 4.15V, which does not exceed the cell threshold voltage of 4.15V corresponding to cell 20.

[0086] In one embodiment, the current can be appropriately reduced by a preset percentage, for example, by 20%-30%, based on a determined smaller value. Taking a reduction of 200mA from the smaller value of 10A, and using a constant current charging of 9.8A as an example, then Uc = 4V + 9.8A * 15mohm = 4.147V. ​​In this case, the voltage of cell 20 is around 4.147V, not exceeding the cell threshold voltage of 4.15V corresponding to cell 20.

[0087] Assuming the current charging current is 3.55A, if the cell voltage exceeds 4.15V in the next cycle, the fast charging module 40 needs to select a maximum rechargeable current less than 9.8A corresponding to the cell threshold voltage of 4.5V. For example, if the maximum rechargeable current corresponding to a cell threshold voltage of 4.15V is 20A, 4.19V is 14A, 4.43V is 10A, and 4.5V is 8A, then the maximum rechargeable current less than 9.8A needs to be selected, i.e., constant current fast charging at 8A.

[0088] Regarding the aging of cell 20, the current internal resistance of cell 20 is first calculated. Assuming the initial internal resistance increases to 40 mohm after aging, the next step is to calculate the maximum rechargeable current Imax = (4.15-4) / 40mohm = 3.75A, corresponding to the initial voltage of 4V. Taking the smaller value of Imax (3.75A) and Ic (20A), 3.75A, system 10 instructs fast charging module 40 to charge at the smaller value of 3.75A. Therefore, Uc = 4V + 3.75A * 40mohm = 4.15V, which does not exceed the cell threshold voltage of 4.15V corresponding to cell 20.

[0089] In one embodiment, the current can be appropriately reduced by a preset percentage based on a determined smaller value. For example, reducing the current by 200mA from the smaller value of 3.75A, taking a constant current charging of 3.55A as an example, would result in Uc = 4V + 3.55A * 40mohm = 4.142V. In this case, the voltage of cell 20 is around 4.142V, not exceeding the cell threshold voltage of 4.15V corresponding to cell 20.

[0090] The fast charging method of this embodiment of the application is referred to... Figure 6 .like Figure 6 As shown, it includes the following steps:

[0091] Step 302, plug in the charger;

[0092] Step 304: System 10 determines whether it is a fast charger. If yes (Y), proceed to step 306; if no (N), proceed to step 318.

[0093] Step 306: The fuel gauge 50 detects the voltage and current of the battery cell 20;

[0094] Step 308: System 10 is configured with a charging module, i.e., fast charging module 40 only supplies power to the load of system 10 and does not charge battery cell 20. The voltage and current of battery cell 20 are read at this time after a delay.

[0095] Step 310: The system 10 reads the voltage and current of the battery cell 20 through the power meter 50, and determines the internal resistance and corresponding maximum rechargeable current of the battery cell 10 based on the read voltage and current of the battery cell 10, and takes the smaller of the preset maximum rechargeable current corresponding to the initial voltage of the battery cell and the maximum rechargeable current corresponding to the internal resistance as the rechargeable current Io.

[0096] Step 312, System 10 instructs the charging module to adjust the charging current to the rechargeable current Io;

[0097] Step 314: The system 10 periodically reads the fuel gauge 50 and obtains the voltage of the battery cell 20;

[0098] Step 316: When the system 10 detects that the voltage of the battery cell 20 has reached the corresponding battery cell threshold voltage, it informs the charging module to adjust the constant current charging current and returns to step 314.

[0099] Step 318: The charging module charges the battery cell 20 using a standard charging method.

[0100] In this embodiment, when the fast charger is plugged in and the fast charging module 40 is turned on, the charging voltage is directly increased by the rechargeable current Io, which can ensure that the voltage that the battery cell 20 jumps to in one cycle will not exceed the battery cell threshold voltage corresponding to the initial voltage of the battery cell 20.

[0101] like Figure 7The diagram illustrates the changes in fast charging current and voltage of cell 20 during fast charging. During time interval t1, the smaller of the preset maximum rechargeable current corresponding to the initial cell voltage and the maximum rechargeable current corresponding to the internal resistance is calculated as the rechargeable current Io. After calculating the rechargeable current Io, the charging current jumps directly from 0 to the rechargeable current Io and maintains constant current charging, resulting in a corresponding increase in the voltage of cell 20.

[0102] Based on Uc = 4 + 10 * 15 = 4.15V, theoretically, when the charging current is stepped up to 10A, the cell voltage Uc = 4.15V will be detected, which means it has reached one of the cell threshold voltages of cell 20, 4.15V. At this point, the current can be reduced by 200mA from 10A, using 9.8A as the first charging current. Uc = 4V + 9.8A * 15mohm = 4.147V, which will not exceed the cell threshold voltage of 4.15V.

[0103] like Figure 7 As shown, after charging at a constant current of Io for a certain period of time, if the voltage of cell 20 exceeds the cell threshold voltage of 4.15V, the charging current will drop to the preset maximum chargeable current corresponding to the current cell voltage before being used for tiered fast charging.

[0104] Assuming the current charging current is 9.8A, if the cell voltage exceeds 4.15V in the next cycle, the fast charging module 40 needs to select a maximum charging current less than 9.8A corresponding to the cell threshold voltage of 4.5V. For example, if the maximum charging current corresponding to a cell threshold voltage of 4.15V is 20A, 4.19V is 14A, 4.43V is 10A, and 4.5V is 8A, then the maximum charging current less than 9.8A needs to be selected, i.e., constant current fast charging at 8A.

[0105] In this embodiment, the voltage and current of the battery cell are detected to obtain the detection results. Based on the detection results, a first charging current is determined and provided to the battery cell by the charging module. The first charging current ensures that the first charging voltage reached by the battery cell within at least one cycle does not exceed the battery cell threshold voltage before the charging module supplies power. This provides a safer and more precise fast charging control, ensuring that the voltage of the battery cell does not exceed the battery cell's specified threshold voltage and the withstand voltage of other system components during fast charging. It avoids the risk to battery safety and the withstand voltage of other system components caused by the second-level high voltage of the battery cell when the charger is plugged in for fast charging, especially after the battery cell has aged.

[0106] Optionally, such as Figure 8As shown, this application embodiment also provides an electronic device 900, including a processor 940 and a memory 920. The memory 920 stores a program or instructions that can run on the processor 940. When the program or instructions are executed by the processor 940, they implement the various steps of the above-described fast charging method embodiment and can achieve the same technical effect. To avoid repetition, they will not be described again here.

[0107] It should be noted that the electronic devices in the embodiments of this application include the aforementioned mobile electronic devices and non-mobile electronic devices.

[0108] Figure 9 A schematic diagram of the hardware structure of an electronic device to implement an embodiment of this application.

[0109] The electronic device 1000 includes, but is not limited to, components such as: radio frequency unit 1001, network module 1002, audio output unit 1003, input unit 1004, sensor 1005, display unit 1006, user input unit 1007, interface unit 1008, memory 1009, and processor 1010.

[0110] Those skilled in the art will understand that the electronic device 1000 may also include a power supply (such as a battery) for supplying power to various components. The power supply may be logically connected to the processor 1010 through a power management system, thereby enabling functions such as managing charging, discharging, and power consumption through the power management system. Figure 9 The electronic device structure shown does not constitute a limitation on the electronic device. The electronic device may include more or fewer components than shown, or combine certain components, or have different component arrangements, which will not be elaborated here.

[0111] The processor 1010 is used to detect the voltage and current of the battery cell and obtain the detection result; determine a first charging current based on the detection result; and provide the first charging current to the battery cell through the charging module. The battery cell includes multiple cell threshold voltages, each corresponding to a different preset maximum rechargeable current. The first charging current is used to enable the battery cell to reach a first charging voltage within at least one cycle. The first charging voltage does not exceed the target cell threshold voltage corresponding to the battery cell before the charging module supplies power. One cycle corresponds to the time from the detection result to the charging module providing the first charging current.

[0112] Optionally, the processor 1010 is configured to acquire the initial voltage of the battery cell detected before the charging module supplies power; determine the target battery cell threshold voltage corresponding to the battery cell based on the initial voltage; control the charging module to increase the current step by step from zero at preset current intervals to obtain a second charging current and supply power to the battery cell; acquire the detection result; and, based on the detection result, if the second charging current makes the charging voltage that the battery cell can reach less than the target battery cell threshold voltage, use the second charging current as the first charging current.

[0113] Optionally, the processor 1010 is further configured to, based on the detection result, reduce the second charging current by a preset amount to obtain the first charging current, provided that the charging voltage achievable by the battery cell with the second charging current is not less than the target battery cell threshold voltage.

[0114] Optionally, the processor 1010 is configured to acquire the initial voltage of the battery cell detected before the charging module supplies power; determine the target battery cell threshold voltage corresponding to the battery cell based on the initial voltage; determine the internal resistance of the battery cell; determine the first maximum rechargeable current corresponding to the battery cell based on the initial voltage, the target battery cell threshold voltage, and the internal resistance of the battery cell; and determine the first charging current based on the smaller of the first maximum rechargeable current and the preset maximum rechargeable current corresponding to the target battery cell threshold voltage.

[0115] Optionally, the processor 1010 is configured to acquire a first voltage and a first current of the battery cell when the charging module simultaneously supplies power to the battery cell and the system load; acquire a second voltage and a second current of the battery cell when the charging module only supplies power to the system module, wherein the second voltage is equal to the initial voltage; and determine the internal resistance of the battery cell based on the first voltage, the first current, the second voltage, and the second current.

[0116] Optionally, the processor 1010 is configured to determine the internal resistance of the battery cell according to the following formula: Rc = (U2 - U1) / (I2 - I1);

[0117] Wherein, Rc represents the internal resistance of the battery cell, U1 represents the first voltage, I1 represents the first current, U2 represents the second voltage, and I2 represents the second current.

[0118] Optionally, the processor 1010 is configured to determine the first maximum rechargeable current according to the following formula, Imax = (Uc - U2) / Rc;

[0119] Where Imax represents the first maximum rechargeable current, and Uc represents the target cell threshold voltage.

[0120] Optionally, the processor 1010 is also used for:

[0121] The detection result is acquired during the process of the charging module providing the first charging current to the battery cell;

[0122] Based on the detection results, when the charging voltage that the battery cell can reach is greater than the target battery cell threshold voltage due to the first charging current, the first charging current is reduced to a first preset maximum rechargeable current. The first preset maximum rechargeable current is the maximum value among the multiple different preset maximum rechargeable currents that are less than the first charging current.

[0123] In this embodiment, the voltage and current of the battery cell are detected to obtain the detection results. Based on the detection results, a first charging current is determined and provided to the battery cell by the charging module. The first charging current ensures that the first charging voltage reached by the battery cell within at least one cycle does not exceed the battery cell threshold voltage before the charging module supplies power. This provides a safer and more precise fast charging control, ensuring that the voltage of the battery cell does not exceed the battery cell's specified threshold voltage and the withstand voltage of other system components during fast charging. It avoids the risk to battery safety and the withstand voltage of other system components caused by the second-level high voltage of the battery cell when the charger is plugged in for fast charging, especially after the battery cell has aged.

[0124] It should be understood that, in this embodiment, the input unit 1004 may include a graphics processing unit (GPU) 10041 and a microphone 10042. The GPU 10041 processes image data of still images or videos obtained by an image capture device (such as a camera) in video capture mode or image capture mode. The display unit 1006 may include a display panel 10061, which may be configured in the form of a liquid crystal display, an organic light-emitting diode, or the like. The user input unit 1007 includes a touch panel 10071 and at least one of other input devices 10072. The touch panel 10071 is also called a touch screen. The touch panel 10071 may include a touch detection device and a touch controller. Other input devices 10072 may include, but are not limited to, physical keyboards, function keys (such as volume control buttons, power buttons, etc.), trackballs, mice, and joysticks, which will not be described in detail here.

[0125] The memory 1009 can be used to store software programs and various data. The memory 1009 may primarily include a first storage area for storing programs or instructions and a second storage area for storing data. The first storage area may store the operating system, application programs or instructions required for at least one function (such as sound playback, image playback, etc.). Furthermore, the memory 1009 may include volatile memory or non-volatile memory, or both. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory can be random access memory (RAM), static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct memory bus RAM (DRRAM). The memory 1009 in this embodiment includes, but is not limited to, these and any other suitable types of memory.

[0126] The processor 1010 may include one or more processing units; optionally, the processor 1010 integrates an application processor and a modem processor, wherein the application processor mainly handles operations involving the operating system, user interface, and applications, and the modem processor mainly handles wireless communication signals, such as a baseband processor. It is understood that the aforementioned modem processor may also not be integrated into the processor 1010.

[0127] This application also provides a readable storage medium storing a program or instructions. When the program or instructions are executed by a processor, they implement the various processes of the above-described fast charging method embodiments and achieve the same technical effect. To avoid repetition, they will not be described again here.

[0128] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0129] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various processes of the above-described fast charging method embodiments and achieve the same technical effect. To avoid repetition, it will not be described again here.

[0130] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0131] This application provides a computer program product, which is stored in a storage medium and executed by at least one processor to implement the various processes of the fast charging method embodiments described above, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0132] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0133] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0134] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A fast charging method, characterized in that, include: The voltage and current of the battery cell are measured to obtain the test results; Based on the detection results, the first charging current is determined; The charging module provides the first charging current to the battery cell; The battery cell includes multiple cell threshold voltages, each corresponding to a different preset maximum chargeable current; the first charging current is used to enable the battery cell to reach a first charging voltage within at least one cycle; the first charging voltage does not exceed the target cell threshold voltage corresponding to the battery cell before the charging module supplies power; one cycle corresponds to the time from the detection result to the charging module providing the first charging current; Determining the first charging current based on the detection result includes: acquiring the initial voltage of the battery cell detected before the charging module supplies power; determining the target battery cell threshold voltage corresponding to the battery cell based on the initial voltage; controlling the charging module to increase the current stepwise from zero at preset current intervals to obtain a second charging current and supply power to the battery cell; acquiring the detection result; and, based on the detection result, if the second charging current causes the charging voltage that the battery cell can reach to be less than the target battery cell threshold voltage, using the second charging current as the first charging current; or Determining the first charging current based on the detection results includes: acquiring the initial voltage of the battery cell detected before the charging module supplies power; determining the target battery cell threshold voltage corresponding to the battery cell based on the initial voltage; determining the internal resistance of the battery cell; determining the first maximum rechargeable current corresponding to the battery cell based on the initial voltage, the target battery cell threshold voltage, and the internal resistance of the battery cell; and determining the first charging current based on the smaller of the first maximum rechargeable current and the preset maximum rechargeable current corresponding to the target battery cell threshold voltage.

2. The method according to claim 1, characterized in that, Determining the first charging current based on the detection results further includes: Based on the detection results, if the second charging current ensures that the charging voltage achievable by the battery cell is not less than the target battery cell threshold voltage, the second charging current is reduced by a preset amount to obtain the first charging current.

3. The method according to claim 2, characterized in that, The preset size is 20%-30% of the preset current interval.

4. The method according to any one of claims 1 to 3, characterized in that, The preset current interval is 1-2 A.

5. The method according to claim 1, characterized in that, Determining the internal resistance of the battery cell includes: When the charging module simultaneously supplies power to the battery cell and the system load, the first voltage and first current of the battery cell are detected. When the charging module supplies power only to the system load, the second voltage and the second current of the battery cell are detected, and the second voltage is equal to the initial voltage. The internal resistance of the battery cell is determined based on the first voltage, the first current, the second voltage, and the second current.

6. The method according to claim 5, characterized in that, Determining the internal resistance of the battery cell based on the first voltage, the first current, the second voltage, and the second current includes: The internal resistance of the battery cell is determined according to the following formula: Rc=(U2-U1) / (I2-I1); Wherein, Rc represents the internal resistance of the battery cell, U1 represents the first voltage, I1 represents the first current, U2 represents the second voltage, and I2 represents the second current.

7. The method according to claim 6, characterized in that, Based on the initial voltage, the target cell threshold voltage, and the cell's internal resistance, the first maximum rechargeable current corresponding to the cell is determined, including: The first maximum rechargeable current is determined according to the following formula: Imax = (Uc - U2) / Rc; Where Imax represents the first maximum rechargeable current, and Uc represents the target cell threshold voltage.

8. The method according to claim 1, characterized in that, Also includes: The detection result is acquired during the process of the charging module providing the first charging current to the battery cell; Based on the detection results, when the charging voltage that the battery cell can reach is greater than the target battery cell threshold voltage due to the first charging current, the first charging current is reduced to a first preset maximum rechargeable current. The first preset maximum rechargeable current is the maximum value among the multiple different preset maximum rechargeable currents that are less than the first charging current.

9. An electronic device, characterized in that, It includes a processor and a memory, the memory storing programs or instructions that can run on the processor, the programs or instructions being executed by the processor to implement the steps of the fast charging method as described in any one of claims 1-8.

10. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the steps of the fast charging method as described in any one of claims 1-8.

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