Charging method, charging apparatus, energy-storage power source, and computer-readable storage medium

Abstract

A charging method, a charging apparatus, an energy-storage power source, and a computer-readable storage medium. The charging method is used for charging a battery cell (30). The charging method comprises: acquiring the current state of charge of a battery cell (30); when the current state of charge of the battery cell (30) is below or equal to a preset state of charge, controlling a power source to charge the battery cell (30), wherein the preset state of charge is determined on the basis of the number of instances of performing float charging on the battery cell (30) within a preset period; and when the current state of charge of the battery cell (30) is above the preset state of charge, maintaining the current state of the battery cell (30).

Description

Charging method, charging device, energy storage power supply and computer-readable storage medium

[0001] Priority information

[0002] This application claims priority and benefits of patent application No. 202311136912.7 filed with the State Intellectual Property Office of China on September 4, 2023, and the entire text of which is incorporated herein by reference. Technical Field

[0003] The present application relates to the field of power supply technology, and in particular to a charging method, a charging device, an energy storage power supply, and a computer-readable storage medium. Background Art

[0004] In related technologies, after a mobile energy storage power supply is fully charged, it is often left connected to the charger for a long time. During this time, the power supply inside the mobile energy storage power supply has low power consumption, which consumes the battery power, and the battery self-discharges when fully charged, both of which will cause the state of charge of the battery inside the mobile energy storage power supply to decrease. To ensure that the mobile energy storage power supply remains fully charged after the charger is unplugged, the battery management system will adopt a strategy of immediately starting charging to replenish the power after power failure. This causes the mobile energy storage power supply to experience a high frequency of floating charge. High frequency of floating charge can affect the cycle life of the mobile energy storage power supply and even lead to safety risks.

[0005] Summary of the Invention

[0006] The embodiments of the present application provide a charging method, a charging device, an energy storage power supply, and a computer-readable storage medium to solve at least one of the above-mentioned technical problems.

[0007] A charging method according to an embodiment of the present application is used for charging a battery cell, and the charging method includes:

[0008] Obtaining the current state of charge of the battery cell;

[0009] When the current state of charge of the battery cell is less than or equal to a preset state of charge, controlling the power supply to charge the battery cell, wherein the preset state of charge is determined by the number of float charges of the battery cell within a preset period;

[0010] When the current state of charge of the battery cell is greater than the preset state of charge, the current state of the battery cell is maintained.

[0011] In the above charging method, the power supply is controlled to charge the battery cell when the current state of charge of the battery cell is less than or equal to the preset state of charge. The preset state of charge is determined by the maximum number of float charges of the battery cell within a preset period. In this way, the battery cell can still maintain a 100% charge state after being disconnected from the power supply, avoiding high-frequency float charging of the battery cell due to internal power consumption, thereby improving the cycle life of the battery cell and reducing safety risks.

[0012] A charging device according to an embodiment of the present application is used for charging a battery cell. The charging device includes a control module, which is configured to:

[0013] Obtaining the current state of charge of the battery cell;

[0014] When the current state of charge of the battery cell is less than or equal to a preset state of charge, controlling the power supply to charge the battery cell, wherein the preset state of charge is determined by the number of float charges of the battery cell within a preset period;

[0015] When the current state of charge of the battery cell is greater than the preset state of charge, the current state of the battery cell is maintained.

[0016] A charging device according to an embodiment of the present application includes a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the charging method described in any one of the above embodiments are implemented.

[0017] An energy storage power supply according to an embodiment of the present application includes a battery cell and a charging device according to any one of the above embodiments, wherein the charging device is electrically connected to the battery cell.

[0018] A computer-readable storage medium according to an embodiment of the present application stores a computer program, which, when executed by a processor, implements the steps of the charging method described in any one of the above embodiments.

[0019] In the above-mentioned charging device, energy storage power supply and computer-readable storage medium, the power supply is controlled to charge the battery cell when the current state of charge of the battery cell is less than or equal to the preset state of charge, and the preset state of charge is determined by the maximum number of float charges of the battery cell within a preset period, so that the battery cell can still maintain a 100% charge state after being disconnected from the power supply, avoiding high-frequency float charging of the battery cell due to internal power consumption, thereby improving the cycle life of the battery cell and reducing safety risks.

[0020] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] FIG1 is a flow chart of a charging method according to an embodiment of the present application;

[0023] FIG2 is a schematic diagram of cycle life curves of a battery cell according to an embodiment of the present application and a battery cell according to a comparative solution;

[0024] FIG3 is a chart of float charge test data of a test cell according to an embodiment of the present application;

[0025] FIG4 is a schematic diagram of a charging curve of a battery cell according to an embodiment of the present application;

[0026] FIG5 is another flow chart of a charging method according to an embodiment of the present application;

[0027] FIG6 is a schematic diagram of a module of an energy storage power supply according to an embodiment of the present application;

[0028] FIG7 is a schematic diagram of a module of a charging device according to an embodiment of the present application.

[0029] Reference numerals: energy storage power supply 100 ; charging device 10 ; control module 20 ; battery cell 30 ; memory 40 ; processor 50 . DETAILED DESCRIPTION

[0030] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be understood as limiting the present application.

[0031] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting this application. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections. They can refer to mechanical connections or electrical connections. They can refer to direct connections or indirect connections through an intermediary. They can refer to internal communication between two components or interactions between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0033] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0034] The disclosure herein provides many different embodiments or examples for realizing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described herein. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art will appreciate the application of other processes and / or the use of other materials.

[0035] Referring to FIG1 , a charging method according to an embodiment of the present application is used to charge a battery cell 30. The charging method includes:

[0036] Step 001: Obtain the current state of charge of the battery cell 30;

[0037] Step 002: When the current state of charge of the battery cell 30 is less than or equal to a preset state of charge, controlling the power supply to charge the battery cell 30 , where the preset state of charge is determined by the number of float charges of the battery cell 30 within a preset period;

[0038] Step 003 : When the current state of charge of the battery cell 30 is greater than the preset state of charge, maintain the current state of the battery cell 30 .

[0039] In the above-mentioned charging method, the power supply is controlled to charge the battery cell 30 when the current state of charge of the battery cell 30 is less than or equal to the preset state of charge, and the preset state of charge is determined by the maximum number of floating charges of the battery cell 30 within a preset period, so that the battery cell 30 can still maintain a 100% charge state after being disconnected from the power supply, avoiding high-frequency floating charging of the battery cell 30 due to internal power consumption, thereby improving the cycle life of the battery cell 30 and reducing safety risks.

[0040] Specifically, in one embodiment, after the battery cell 30 is connected to a power source and charged to 100% state of charge, it remains connected to the power source. The system can obtain the current state of charge of the battery cell 30 by monitoring the real-time status of the battery cell 30. The system can set a preset state of charge with a fixed value for the battery cell 30. The system can compare the current state of charge of the battery cell 30 with the preset state of charge. In one embodiment, if the current state of charge of the battery cell 30 is less than or equal to the preset state of charge, the system can control the power source to charge the battery cell 30. The preset state of charge is less than 100%. For example, if the current state of charge of the battery cell 30 is 89% and the preset state of charge is 90%, and the current state of charge of the battery cell 30 is less than the preset state of charge of 90%, the power source will be controlled to charge the battery cell 30. The preset state of charge is determined by the number of float charges performed on the battery cell 30 within a preset period. For example, the preset state of charge set for a battery cell 30 can be determined by the number of times the battery cell 30 is connected to a power source for float charging in a year. In one embodiment, when the current state of charge of the battery cell 30 is greater than a preset state of charge, the current state of the battery cell 30 is maintained and the battery cell 30 is not charged. In other words, by controlling the power supply to charge the battery cell 30 when the current state of charge of the battery cell 30 is less than or equal to the preset state of charge, the battery cell 30 can maintain a 100% state of charge even after being disconnected from the power supply. This prevents the battery cell 30 from undergoing frequent float charging due to internal power loss, thereby increasing the cycle life of the battery cell 30 and reducing safety risks.

[0041] It should be noted that for different models of battery cells 30, under the most stringent conditions, the maximum tolerance of the impact of the number of float charges on the safety of the battery cells 30 can be expressed as the maximum number of float charges of the battery cells 30. In one embodiment, under normal circumstances, the number of float charges of the battery cells 30 in a year can reach tens of thousands. If the number of float charges of the battery cells 30 is controlled to be far below the maximum number of float charges of the battery cells 30 regardless of the conditions, the occurrence of side reactions within the battery cells 30 can be reduced, the gas production inside the battery can be reduced, the increase of internal pressure can be prevented, and the safety of the battery cells 30 can be ensured.

[0042] In addition, in the embodiment shown in Figure 2, the horizontal axis is the number of charge and discharge cycles of the battery cell 30, and the vertical axis is the capacity retention rate of the battery cell 30. L1 represents the battery cell 30 of the charging method of the embodiment of the present application, and L2 represents the battery cell of the comparative solution. The cycle life of the battery cell 30 using the charging method of the embodiment of the present application is significantly improved compared with the cycle life of the battery cell of the comparative solution. The comparative solution is a floating charging method under normal circumstances. The cycle life is the number of repeated charge and discharge cycles that the battery cell 30 can undergo.

[0043] In some embodiments, the step of determining the preset state of charge based on the number of float charges of the battery cell 30 within a preset period includes:

[0044] Obtaining power consumption of the battery cell 30 during a preset period;

[0045] Determine the floating charge capacity of the battery cell 30 based on the power loss, where the floating charge capacity is equal to the power loss;

[0046] The preset state of charge is determined based on the float charge amount and the number of float charges.

[0047] In this way, the predetermined state of charge can be determined.

[0048] Specifically, in one embodiment, the system can obtain the power loss of the battery cell 30 during a preset period through methods such as device recording. The power loss may include the power of the battery cell 30 that is consumed by low power consumption and the power released by self-discharge when the battery cell 30 is fully charged. The required floating charge amount can be determined based on the power loss, that is, the floating charge amount is equal to the power loss. For example, the value of the power loss of the battery cell 30 during the preset period may be 20, and the value of the full charge of the battery cell 30 may be 100. To make the power of the battery cell 30 reach the value of the full charge, the power loss needs to be charged back, that is, the required floating charge amount is 20. Finally, based on the floating charge amount and the number of floating charges, the preset state of charge can be determined.

[0049] In certain embodiments, the preset state of charge is calculated according to the following formula: S2 = 100% - (m×I) / (n×C0),

[0050] Among them, n represents the number of float charges of the battery cell 30 within the preset period, m represents the duration of the preset period, I represents the power consumption current of the battery cell 30, S2 represents the preset state of charge, and C0 represents the nominal power of the battery cell 30.

[0051] In this way, the predetermined state of charge can be determined.

[0052] Specifically, in one embodiment, the number of float charges of the battery cell 30 within a preset period can be first obtained. For example, if the preset period is one year and the duration of the preset period can be measured in hours, then m can be 365 days multiplied by 24 hours, and the number of float charges n of the battery cell 30 within one year can be 80. Under this condition, the safety and cycle life of the battery cell 30 are optimized. The system then obtains the power consumption current I of the battery cell 30 and the nominal charge C0 of the battery cell 30, and calculates them according to the formula S2 = 100% - (365 × 24 × I) / (80 × C0). Since I and C0 are known quantities, the unknown quantity S2 can be calculated through derivation of the formula, thereby determining the preset state of charge.

[0053] It should be noted that the power consumption current of the battery cell 30 refers to the current of the battery cell 30 in the standby state when the battery cell 30 is not performing any operation.

[0054] 3 , in some embodiments, the preset period includes one year, and the number of float charges of the battery cell 30 in one year is less than or equal to 80.

[0055] In this way, the cycle life of the battery cell 30 can be improved and the safety of the battery cell 30 can be ensured.

[0056] Specifically, in one embodiment, the battery cell 30 is placed in a high temperature environment of 60°C. Under such environmental conditions, the floating charge of the battery cell 30 can have the greatest impact on the safety and cycle life of the battery cell 30. Figure 3 is a tabular data obtained by performing a general floating charge test on a cylindrical battery cell made of ternary high nickel material as a test cell. In Figure 3, there can be 10 test cells, and the test cells are tested according to the following steps: Step 1, place the test cell in a high temperature environment of 60°C and let it stand for 1 hour; Step 2, charge the test cell with a small current to a voltage of 4.2V, which can be the upper limit voltage of the test cell; Step 3, charge the test cell with a constant voltage of 4.2V to 0.05C, which is the capacity of the test cell when it is charged; Step 4, discharge the test cell with a small current to a voltage of 4.1V, which can be the lower limit voltage of the test cell; Step 5, repeat steps 3 and 4, and perform the cycle test for 14 days or the CID (current interrupt device) is flipped. The final test results showed that the CID flips of 4 of the 10 test cells reached more than 8,000 times, while the other 6 test cells did not experience CID flips. These 4 test cells were test cell No. 4 with a CID flip of 8,860 times, test cell No. 6 with a CID flip of 8,591 times, test cell No. 7 with a CID flip of 8,730 times, and test cell No. 10 with a CID flip of 8,440 times. Therefore, according to the data in the table, it can be concluded that after more than 8,000 float charges, the internal pressure of the test cell increases, causing the CID flip. At this time, the voltage of the test cell is zero, and the test cell may have a critical safety risk. In addition, CID flip refers to when the cell fails (such as overheating, short circuit, overcharging, etc.), a lot of gas will be generated inside. When the pressure increases, the solder joints welded to the aluminum plate and the pressure relief plate fall off, and the pressure relief plate flips, causing the internal circuit of the cell to be broken, thus playing a protective role.

[0057] It should be noted that based on test data from the tested cells, it was concluded that, in extreme high-temperature environments, the cell 30 may produce gas after more than 8,000 float charges. This can increase the internal pressure of the cell 30 and cause the cell 30 with the CID to flip, resulting in the cell 30's voltage dropping to zero. In one embodiment, by limiting the number of float charges per year to less than 80, meaning that the maximum number of float charges is 10% of the critical risk float charge number, the cycle life of the cell 30 can be improved, ensuring the safety of the cell 30.

[0058] In some embodiments, the current state of charge of the battery cell 30 is calculated by the following formula: S1=100%-(I×t) / C0,

[0059] Wherein, S1 represents the current state of charge of the battery cell 30 , I represents the power consumption current of the battery cell 30 , t represents the time between the battery cell 30 being powered off from a 100% state of charge to the calculation of the current state of charge of the battery cell 30 , and C0 represents the nominal capacity of the battery cell 30 .

[0060] In this way, the current state of charge of the battery cell 30 can be determined.

[0061] Specifically, in one embodiment, the system can obtain the power consumption current I of the battery cell 30 and the nominal capacity of the battery cell 30, then record the specific time when the battery cell 30 reaches 100% state of charge, and then record the specific time when the battery cell 30 is powered off from 100% state of charge to calculate the current state of charge of the battery cell 30, thereby obtaining the time t between the two times. For example, if the specific time when the battery cell 30 reaches 100% state of charge is recorded as 12:00, and the specific time when the battery cell 30 is powered off from 100% state of charge to calculate the current state of charge of the battery cell 30 is recorded as 15:00, then the time between the two times is t = 3 hours. The nominal capacity of the battery cell 30 can be the theoretical value of the battery cell 30. The system uses the acquired data through the set calculation formula S1 = 100% - (I×t) / C0, where I, t, and C0 are all known quantities, to ultimately calculate the current state of charge of the battery cell 30. In addition, the calculation formula S1=100%-(I×t) / C0 can be obtained by the ampere-hour integration method.

[0062] In conjunction with FIG. 4 and FIG. 5 , in some embodiments, the charging method includes:

[0063] Step 004: Obtain a charging curve of the battery cell 30 , where the charging curve includes a relationship between the state of charge and the open circuit voltage of the battery cell 30 ;

[0064] Step 005: Determine a preset open circuit voltage corresponding to a preset state of charge and a current open circuit voltage corresponding to a current state of charge of the battery cell 30 according to the charging curve;

[0065] Step 006: When the current open circuit voltage is less than or equal to the preset open circuit voltage, control the power supply to charge the battery cell 30;

[0066] Step 007 : When the current open circuit voltage is greater than the preset open circuit voltage, maintain the current state of the battery cell 30 .

[0067] In this way, when the current open circuit voltage corresponding to the current charge state of the battery cell 30 is less than or equal to the preset open circuit voltage, the power supply can be ensured to charge the battery cell 30 so that the battery cell 30 maintains a 100% charge state when disconnected from the power supply.

[0068] Specifically, in one embodiment, the system can obtain the charging curve of the battery cell 30, and the open circuit voltage corresponding to the state of charge of the battery cell 30 can be found from the charging curve of the battery cell 30. Therefore, according to the charging curve, when the preset state of charge is obtained, the corresponding preset open circuit voltage can be found, and then the corresponding current open circuit voltage can be found according to the current state of charge of the battery cell 30. In one embodiment, when the current open circuit voltage is less than or equal to the preset open circuit voltage, the power supply can be controlled to charge the battery cell 30. In one embodiment, when the current open circuit voltage is greater than the preset open circuit voltage, the current state of the battery cell 30 can be maintained and the battery cell 30 is not charged. That is to say, when the current open circuit voltage corresponding to the current state of charge of the battery cell 30 is less than or equal to the preset open circuit voltage, it is ensured that the power supply charges the battery cell 30, so that the battery cell 30 maintains a 100% charge state when it is disconnected from the power supply.

[0069] It should be noted that in other embodiments, when multiple battery cells 30 are assembled to form a battery pack and a power source is connected to the battery pack, the system can detect the open-circuit voltage of each battery cell 30. If the highest open-circuit voltage among the open-circuit voltages of each battery cell 30 is less than or equal to a preset open-circuit voltage, the power source can be controlled to charge the battery pack. If the highest open-circuit voltage among the open-circuit voltages of each battery cell 30 is greater than the preset open-circuit voltage, the current state of the battery pack can be maintained. In this case, the preset open-circuit voltage refers to the preset open-circuit voltage corresponding to the preset state of charge of the battery pack.

[0070] Referring to FIG6 , a charging device 10 according to an embodiment of the present application is used to charge a battery cell 30. The charging device 10 includes a control module 20. The control module 20 is configured to: obtain the current state of charge (SOC) of the battery cell 30; control the power supply to charge the battery cell 30 if the current SOC of the battery cell 30 is less than or equal to a preset SOC, where the preset SOC is determined by the number of float charges performed on the battery cell 30 within a preset period; and maintain the current SOC of the battery cell 30 if the current SOC of the battery cell 30 is greater than the preset SOC.

[0071] In the above-mentioned charging device 10, the power supply is controlled to charge the battery cell 30 when the current state of charge of the battery cell 30 is less than or equal to the preset state of charge, and the preset state of charge is determined by the maximum number of float charges of the battery cell 30 within a preset period, so that the battery cell 30 can still maintain a 100% charge state after being disconnected from the power supply, avoiding high-frequency float charging of the battery cell 30 due to internal power consumption, thereby improving the cycle life of the battery cell 30 and reducing safety risks.

[0072] Specifically, the control module 20 may include a control system. In one embodiment, the control module 20 may obtain the current state of charge of the battery cell 30. If the current state of charge of the battery cell 30 is less than or equal to a preset state of charge, the control module 20 may control the power supply to charge the battery cell 30. The preset state of charge is determined by the number of float charges of the battery cell 30 within a preset period. If the current state of charge of the battery cell 30 is greater than the preset state of charge, the control module 20 may maintain the current state of charge of the battery cell 30.

[0073] In some embodiments, the control module 20 is used to: obtain the power loss of the battery cell 30 during a preset period; determine the float charge amount of the battery cell 30 based on the power loss, and the float charge amount is equal to the power loss; determine the preset state of charge based on the float charge amount and the number of float charges.

[0074] In this way, the predetermined state of charge can be determined.

[0075] Specifically, in one embodiment, the control module 20 may obtain the power loss of the battery cell 30 during a preset period. Based on the power loss, the control module 20 may determine the float charge capacity of the battery cell 30, and the float charge capacity may be equal to the power loss. Based on the float charge capacity and the number of float charges, the control module 20 may ultimately determine a preset state of charge. For other specific embodiments, please refer to the above description.

[0076] In some embodiments, the control module 20 is configured to calculate the preset state of charge according to the following formula: S2 = 100% - (m×I) / (n×C0),

[0077] Among them, n represents the number of float charges of the battery cell 30 within the preset period, m represents the duration of the preset period, I represents the power consumption current of the battery cell 30, S2 represents the preset state of charge, and C0 represents the nominal power of the battery cell 30.

[0078] In this way, the predetermined state of charge can be determined.

[0079] Specifically, the control module 20 can be used to obtain the number of float charges of the battery cell 30 within a preset period, the power consumption current of the battery cell 30, and the nominal capacity of the battery cell 30, and then calculate the preset state of charge according to the formula S2 = 100% - (m×I) / (n×C0). For other specific embodiments, please refer to the above description.

[0080] In some embodiments, the control module 20 is configured to calculate the current state of charge of the battery cell 30 using the following formula: S1 = 100% - (I×t) / C0,

[0081] Wherein, S1 represents the current state of charge of the battery cell 30 , I represents the power consumption current of the battery cell 30 , t represents the time between the battery cell 30 being powered off from a 100% state of charge to the calculation of the current state of charge of the battery cell 30 , and C0 represents the nominal capacity of the battery cell 30 .

[0082] In this way, the current state of charge of the battery cell 30 can be determined.

[0083] Specifically, the control module 20 may be configured to obtain the power consumption current of the battery cell 30 and the nominal capacity of the battery cell 30 , as well as the time between when the battery cell 30 loses power from a 100% state of charge and when the current state of charge of the battery cell 30 is calculated. The current state of charge of the battery cell 30 may then be calculated using the formula S1=100%-(I×t) / C0. For other specific embodiments, please refer to the above description.

[0084] In some embodiments, the control module 20 is used to: obtain a charging curve of the battery cell 30, the charging curve including the relationship between the state of charge and the open circuit voltage of the battery cell 30; determine, based on the charging curve, a preset open circuit voltage corresponding to the preset state of charge and a current open circuit voltage corresponding to the current state of charge of the battery cell 30; control the power supply to charge the battery cell 30 when the current open circuit voltage is less than or equal to the preset open circuit voltage; and maintain the current state of the battery cell 30 when the current open circuit voltage is greater than the preset open circuit voltage.

[0085] In this way, when the current open circuit voltage corresponding to the current charge state of the battery cell 30 is less than or equal to the preset open circuit voltage, the power supply can be ensured to charge the battery cell 30 so that the battery cell 30 maintains a 100% charge state when disconnected from the power supply.

[0086] Specifically, the control module 20 can obtain a charging curve for the battery cell 30, which includes the relationship between the state of charge and the open circuit voltage of the battery cell 30. Based on the charging curve, the control module 20 can determine a preset open circuit voltage corresponding to the preset state of charge and a current open circuit voltage corresponding to the current state of charge of the battery cell 30. If the current open circuit voltage is less than or equal to the preset open circuit voltage, the control module 20 can control the power supply to charge the battery cell 30. If the current open circuit voltage is greater than the preset open circuit voltage, the control module 20 can maintain the current state of the battery cell 30. For other specific embodiments, please refer to the above description.

[0087] 7 , a charging device 10 according to an embodiment of the present application includes a memory 40 and a processor 50. The memory 40 stores a computer program, and when the processor 50 executes the computer program, the steps of the charging method according to any of the above embodiments are implemented.

[0088] For example, when the computer program is executed, the following steps may be implemented:

[0089] Step 001: Obtain the current state of charge of the battery cell 30;

[0090] Step 002: When the current state of charge of the battery cell 30 is less than or equal to a preset state of charge, controlling the power supply to charge the battery cell 30 , where the preset state of charge is determined by the number of float charges of the battery cell 30 within a preset period;

[0091] Step 003 : When the current state of charge of the battery cell 30 is greater than the preset state of charge, maintain the current state of the battery cell 30 .

[0092] In the above-mentioned charging device 10, the power supply is controlled to charge the battery cell 30 when the current state of charge of the battery cell 30 is less than or equal to the preset state of charge, and the preset state of charge is determined by the maximum number of float charges of the battery cell 30 within a preset period, so that the battery cell 30 can still maintain a 100% charge state after being disconnected from the power supply, avoiding high-frequency float charging of the battery cell 30 due to internal power consumption, thereby improving the cycle life of the battery cell 30 and reducing safety risks.

[0093] Please refer to FIG6 , which shows an energy storage power supply 100 according to an embodiment of the present application. The energy storage power supply 100 includes a battery cell 30 and a charging device 10 according to any of the above embodiments. The charging device 10 is electrically connected to the battery cell 30 .

[0094] In the above-mentioned energy storage power supply 100, the power supply is controlled to charge the battery cell 30 when the current state of charge of the battery cell 30 is less than or equal to the preset state of charge. The preset state of charge is determined by the maximum number of float charges of the battery cell 30 within a preset period. In this way, the battery cell 30 can still maintain a 100% charge state after being disconnected from the power supply, avoiding high-frequency float charging of the battery cell 30 due to internal power consumption, thereby improving the cycle life of the battery cell 30 and reducing safety risks.

[0095] Specifically, the energy storage power supply 100 may include a mobile energy storage power supply and a fixed energy storage power supply. In one embodiment, the charging device 10 can be electrically connected to an external power supply, and the battery cell 30 can be charged by the charging device 10. During the charging process, when the current state of charge of the battery cell 30 is less than or equal to the preset state of charge, the power supply is controlled to charge the battery cell 30, and the preset state of charge is determined by the maximum number of floating charges of the battery cell 30 within a preset period, so that the battery cell 30 can still maintain a 100% state of charge after being disconnected from the power supply, avoiding high-frequency floating charges of the battery cell 30 due to internal power consumption, thereby improving the cycle life of the battery cell 30 and reducing safety risks.

[0096] A computer-readable storage medium according to an embodiment of the present application stores a computer program, which, when executed by the processor 50, implements the steps of the charging method according to any one of the above embodiments.

[0097] For example, when the computer program is executed, the following steps may be implemented:

[0098] Step 001: Obtain the current state of charge of the battery cell 30;

[0099] Step 002: When the current state of charge of the battery cell 30 is less than or equal to a preset state of charge, controlling the power supply to charge the battery cell 30 , where the preset state of charge is determined by the number of float charges of the battery cell 30 within a preset period;

[0100] Step 003 : When the current state of charge of the battery cell 30 is greater than the preset state of charge, maintain the current state of the battery cell 30 .

[0101] In the above-mentioned computer-readable storage medium, the power supply is controlled to charge the battery cell 30 when the current state of charge of the battery cell 30 is less than or equal to the preset state of charge, and the preset state of charge is determined by the maximum number of floating charges of the battery cell 30 within a preset period, so that the battery cell 30 can still maintain a 100% charge state after being disconnected from the power supply, avoiding high-frequency floating charging of the battery cell 30 due to internal power consumption, thereby improving the cycle life of the battery cell 30 and reducing safety risks.

[0102] The computer-readable storage medium may be provided in the control module 20 or in other terminals. The control module 20 may communicate with other terminals to obtain corresponding programs.

[0103] It is understood that computer-readable storage media may include: any entity or device capable of carrying a computer program, recording media, USB flash drives, mobile hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), and software distribution media. A computer program includes computer program code. The computer program code may be in source code form, object code form, an executable file, or some intermediate form. Computer-readable storage media may include: any entity or device capable of carrying a computer program code, recording media, USB flash drives, mobile hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), and software distribution media.

[0104] In certain embodiments of the present application, the control module 20 may be a single-chip microcomputer chip that integrates a processor, memory, a communication module, etc. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0105] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0106] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, apparatus or device (such as a computer-based system, a system including a processing module, or other system that can fetch instructions from an instruction execution system, apparatus or device and execute instructions), or used in conjunction with such instruction execution systems, apparatuses or devices.

[0107] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that specific features, structures, materials, or characteristics described in conjunction with an embodiment or example are included in at least one embodiment or example of the present application. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0108] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A charging method for charging a battery cell, characterized in that: The charging method comprises: Obtaining the current state of charge of the battery cell; When the current state of charge of the battery cell is less than or equal to a preset state of charge, controlling the power supply to charge the battery cell, wherein the preset state of charge is determined by the number of float charges of the battery cell within a preset period; When the current state of charge of the battery cell is greater than the preset state of charge, the current state of the battery cell is maintained.

2. The charging method according to claim 1, characterized in that: The step of determining the preset state of charge by the number of float charges of the battery cell within a preset period includes: Obtaining power consumption of the battery cell during the preset period; Determine a floating charge capacity of the battery cell based on the power loss, the floating charge capacity being equal to the power loss; The preset state of charge is determined based on the float charge amount and the float charge number.

3. The charging method according to claim 2, characterized in that: The preset state of charge is calculated by the following formula: S2 = 100% - (m × I) / (n × C0), Among them, n represents the number of float charges of the battery cell within the preset period, m represents the duration of the preset period, I represents the power consumption current of the battery cell, S2 represents the preset state of charge, and C0 represents the nominal power of the battery cell.

4. The charging method according to claim 3, characterized in that: The preset period includes one year, and the number of float charges of the battery cell in one year is less than or equal to 80.

5. The charging method according to any one of claims 1 to 4, characterized in that: The current state of charge of the battery cell is calculated by the following formula: S1 = 100% - (I × t) / C0, Wherein, S1 represents the current state of charge of the battery cell, I represents the power consumption current of the battery cell, t represents the time from when the battery cell is powered off from a 100% state of charge to when the current state of charge of the battery cell is calculated, and C0 represents the nominal power of the battery cell.

6. The charging method according to any one of claims 1 to 5, characterized in that: The charging method comprises: Acquire a charging curve of the battery cell, wherein the charging curve includes a relationship between a state of charge and an open circuit voltage of the battery cell; Determining, according to the charging curve, a preset open circuit voltage corresponding to the preset state of charge and a current open circuit voltage corresponding to the current state of charge of the battery cell; When the current open circuit voltage is less than or equal to the preset open circuit voltage, controlling the power supply to charge the battery cell; When the current open circuit voltage is greater than the preset open circuit voltage, the current state of the battery cell is maintained.

7. A charging device for charging a battery cell, characterized in that: The charging device comprises a control module, and the control module is used for: Obtaining the current state of charge of the battery cell; When the current state of charge of the battery cell is less than or equal to a preset state of charge, controlling the power supply to charge the battery cell, wherein the preset state of charge is determined by the number of float charges of the battery cell within a preset period; When the current state of charge of the battery cell is greater than the preset state of charge, the current state of the battery cell is maintained.

8. The charging device according to claim 7, characterized in that: The control module is used for: Obtaining power consumption of the battery cell during the preset period; Determine a floating charge capacity of the battery cell based on the power loss, the floating charge capacity being equal to the power loss; The preset state of charge is determined based on the float charge amount and the float charge number.

9. The charging device according to claim 8, characterized in that: The control module is used for: The preset state of charge is calculated by the following formula: S2 = 100% - (m × I) / (n × C0), Among them, n represents the number of float charges of the battery cell within the preset period, m represents the duration of the preset period, I represents the power consumption current of the battery cell, S2 represents the preset state of charge, and C0 represents the nominal power of the battery cell.

10. The charging device according to claim 9, characterized in that: The preset period includes one year, and the number of float charges of the battery cell in one year is less than or equal to 80.

11. The charging device according to any one of claims 7 to 10, characterized in that: The control module is used for: The current state of charge of the battery cell is calculated using the following formula: S1=100%-(I×t) / C0, Wherein, S1 represents the current state of charge of the battery cell, I represents the power consumption current of the battery cell, t represents the time from when the battery cell is powered off from a 100% state of charge to when the current state of charge of the battery cell is calculated, and C0 represents the nominal power of the battery cell.

12. The charging device according to any one of claims 7 to 11, characterized in that: The control module is used for: Acquire a charging curve of the battery cell, wherein the charging curve includes a relationship between a state of charge and an open circuit voltage of the battery cell; Determining, according to the charging curve, a preset open circuit voltage corresponding to the preset state of charge and a current open circuit voltage corresponding to the current state of charge of the battery cell; When the current open circuit voltage is less than or equal to the preset open circuit voltage, controlling the power supply to charge the battery cell; When the current open circuit voltage is greater than the preset open circuit voltage, the current state of the battery cell is maintained.

13. A charging device, characterized in that: The device comprises a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the charging method according to any one of claims 1 to 6 are implemented.

14. An energy storage power supply, characterized in that: The energy storage power source comprises a battery cell and a charging device as described in any one of claims 7 to 13, and the charging device is electrically connected to the battery cell.

15. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the charging method according to any one of claims 1 to 6 are implemented.

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