Control method, control device, energy storage power supply and storage medium

Abstract

The present invention discloses a control method, a control device, an energy storage power supply, and a storage medium. The control method includes: when the energy storage power supply is disconnected from the charger and is under load, obtaining the load current and load time of the energy storage power supply; obtaining the correction time of the energy storage power supply; obtaining the deviation SOC of the energy storage power supply; determining a speed factor based on the ratio of the deviation SOC and the correction time; and obtaining a first SOC of the energy storage power supply according to the load current, speed factor, and load time until the load time reaches the correction time. In the above control method, the first SOC of the energy storage power supply can be obtained according to the load current, speed factor, and load time, thereby improving the accuracy of the first SOC and, to a certain extent, avoiding the situation where the first SOC of the energy storage power supply jumps during use.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage power supplies, and in particular to a control method, a control device, an energy storage power supply and a storage medium. Background Art

[0002] In related technologies, when a fully charged energy storage power supply remains connected to the charging cable, it enters a dormant (standby) state. Due to limited data acquisition accuracy, the energy storage power supply's BMS will not collect data on the energy storage power supply's losses, resulting in deviations in the accuracy of the monitored SOC. When the energy storage power supply is fully charged for a period of time and the charging cable is unplugged and used under load, the SOC displayed by the energy storage power supply at this time will not match the actual SOC, resulting in jumps in the displayed SOC during the use of the energy storage power supply. Summary of the Invention

[0003] The embodiments of the present invention provide a control method, a control device, an energy storage power supply, and a storage medium to solve at least one of the above-mentioned technical problems.

[0004] A control method according to an embodiment of the present invention is used for an energy storage power supply, wherein the energy storage power supply displays a first SOC. The control method includes:

[0005] When the energy storage power supply is disconnected from the charger and is under load, obtaining the load current and load time of the energy storage power supply;

[0006] Obtaining a correction time of the energy storage power supply;

[0007] Obtaining a deviation SOC of the energy storage power supply;

[0008] determining a speed factor based on a ratio of the deviation SOC and the correction time;

[0009] A first SOC of the energy storage power supply is obtained according to the load current, the speed factor, and the load time until the load time reaches the correction time.

[0010] In the above control method, the first SOC of the energy storage power supply can be obtained according to the load current, speed factor and load time, thereby improving the accuracy of the first SOC and avoiding the situation where the first SOC of the energy storage power supply jumps during use to a certain extent.

[0011] In some embodiments, obtaining the correction time of the energy storage power supply includes:

[0012] A correction time of the energy storage power supply is acquired according to the load current, where the correction time is negatively correlated with the load current.

[0013] In some embodiments, obtaining a first SOC of the energy storage power supply according to the load current, the speed factor, and the load time includes:

[0014] Obtaining a second SOC according to the speed factor and the loading time;

[0015] acquiring a third SOC according to the loaded current and the loaded time;

[0016] The first SOC is obtained according to the second SOC and the third SOC.

[0017] In certain embodiments, the control method comprises:

[0018] When the energy storage power supply is connected to the charger, obtaining a fourth SOC of the energy storage power supply;

[0019] When the fourth SOC satisfies a floating charge condition, controlling the charger to charge the energy storage power supply;

[0020] When the fourth SOC does not meet the floating charge condition, the charger is controlled to stop charging the energy storage power supply.

[0021] In certain embodiments, the float charge condition includes a fourth SOC being less than or equal to a set value.

[0022] In certain embodiments, the set value is greater than or equal to 90% and less than or equal to 95%.

[0023] In certain embodiments, when the energy storage power supply is connected to the charger, obtaining a fourth SOC of the energy storage power supply includes:

[0024] Obtaining a deviation SOC of the energy storage power supply;

[0025] The fourth SOC is acquired according to the deviation SOC.

[0026] In some embodiments, obtaining the deviation SOC of the energy storage power supply includes:

[0027] Obtaining the sleep time and rated current of the energy storage power supply;

[0028] The deviation SOC is obtained according to the sleep time and the rated current.

[0029] In some embodiments, obtaining the deviation SOC of the energy storage power supply includes:

[0030] The actual SOC of the energy storage power supply is determined based on the cell voltage of the energy storage power supply, and the deviation SOC is obtained according to the actual SOC.

[0031] A control device according to an embodiment of the present invention includes:

[0032] processor, and;

[0033] A memory storing a computer program, wherein the computer program is executed by the processor to implement the steps of the control method of any of the above embodiments.

[0034] An energy storage power supply according to an embodiment of the present invention includes the above-mentioned control device.

[0035] An embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by the processor, the steps of the control method of any of the above embodiments are implemented.

[0036] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments with reference to the following drawings, in which:

[0038] Figures 1 to 9 is a flow chart of a control method according to an embodiment of the present invention;

[0039] Figure 10 It is a module schematic diagram of an energy storage power supply according to an embodiment of the present invention.

[0040] Description of main component symbols:

[0041] Energy storage power supply 1, control device 2, memory 21, processor 22, battery module 3. DETAILED DESCRIPTION

[0042] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of the present invention, and should not be understood as limiting the embodiments of the present invention.

[0043] See also Figure 1 A control method according to an embodiment of the present invention is used for an energy storage power supply 1. The energy storage power supply 1 displays a first SOC. The control method includes:

[0044] Step S1, when the energy storage power supply 1 is disconnected from the charger and is in a loaded state, obtaining the loaded current and loaded time of the energy storage power supply 1;

[0045] Step S3, obtaining the correction time of the energy storage power supply 1;

[0046] Step S5, obtaining the deviation SOC of the energy storage power supply 1;

[0047] Step S7, determining a speed factor based on the ratio of the deviation SOC and the correction time;

[0048] Step S9: obtaining a first SOC of the energy storage power supply 1 according to the load current, the speed factor, and the load time until the load time reaches the correction time.

[0049] Specifically, the load current refers to the magnitude of the current transmitted when the energy storage power supply 1 supplies power to an external load, that is, the actual current value when the energy storage power supply 1 provides power to the load. The load current can be monitored in real time by the battery management system (BMS) of the energy storage power supply 1, and the load current will change with changes in the load. For example, the load can include but is not limited to household appliances (such as ovens, induction cookers, baking trays, televisions, refrigerators, etc.) and mobile devices (such as smartphones, tablets, laptops, cameras or camcorders, etc.).

[0050] The load time refers to the time that the energy storage power supply 1 operates under the load current.

[0051] The correction time refers to the amount of time determined according to the load current and used to correct the first SOC. Optionally, the correction time may be greater than or equal to 2 minutes and less than or equal to 8 minutes.

[0052] The first SOC (state of charge) may be the SOC displayed on the user interface of the energy storage power supply 1 , and is used to influence the user's expectation of the remaining power of the energy storage power supply 1 and their usage decision.

[0053] Specifically, the energy storage power supply 1 includes a battery module 3 and several electronic components (e.g., a battery management system (BMS) and an inverter). When the energy storage power supply 1 is fully charged and remains connected to a charger, it enters a dormant state. In this state, the electronic components within the energy storage power supply 1 consume a certain amount of static self-consumption power from the battery. However, due to the limited data acquisition accuracy of the BMS, it is unable to monitor small self-consumption currents (e.g., milliampere or microampere levels) in real time. When the energy storage power supply 1 suddenly enters a loaded state from a dormant state, the BMS cannot accurately reflect the actual SOC, which may result in inaccurate first SOC accuracy and cause the first SOC to jump. This phenomenon is particularly prominent in low-temperature environments. In low-temperature environments, the voltage of the battery module 3 drops rapidly, causing the SOC to change faster, thereby increasing the probability of a jump in the first SOC. In addition, when the battery module 3 nears its low charge point, the voltage drop of the battery module 3 tends to become more steep, further increasing the probability of a jump in the first SOC. When the first SOC is the SOC displayed on the user interface, the jump of the first SOC will affect the user's judgment on the endurance of the energy storage power supply 1, thereby reducing the user experience.

[0054] Therefore, when the energy storage power supply 1 is in a fully charged dormant state, the charger is suddenly unplugged and loaded. During the loading process, the first SOC of the energy storage power supply 1 is obtained according to the loaded current, speed factor and loading time. That is, the SOC deviation caused by the capacity loss due to the dormant self-consumption is corrected within the correction time. This can avoid the high cost and low integration problems brought about by the high acquisition accuracy requirements to a certain extent and improve the accuracy of the first SOC, thereby avoiding the risk of the first SOC jump to a certain extent, thereby ensuring the effective display of the real-time usage status of the energy storage power supply 1 and ensuring user experience.

[0055] In summary, in the above control method, the first SOC of the energy storage power supply 1 can be obtained according to the load current, speed factor and load time, thereby improving the accuracy of the first SOC and, to a certain extent, avoiding the situation where the first SOC of the energy storage power supply 1 jumps during use.

[0056] Furthermore, please combine Figure 2 In some embodiments, step S3 includes:

[0057] Step S31 : obtaining the correction time of the energy storage power supply 1 according to the load current. The correction time is negatively correlated with the load current.

[0058] Specifically, the mapping between time and current reflects the relationship between load current and correction time. Load current and correction time are negatively correlated. The greater the load current, the shorter the correction time, and the smaller the load current, the longer the correction time.

[0059] In the above embodiment, the correction time can be determined based on the mapping relationship between time and current and the load current, thereby ensuring that the first SOC change of the energy storage power supply 1 can maintain stability and timeliness under different load current conditions. Specifically, under low load current, the energy storage power supply 1 discharges slowly and the SOC change is also small. A longer correction time can ensure a smooth change in the first SOC during correction, thereby improving the user experience. Under high load current, the energy storage power supply 1 discharges quickly and the SOC change is also large. A shorter correction time can quickly correct the first SOC, thereby reflecting the actual SOC in a timely and accurate manner.

[0060] For example, there is a mapping relationship between the correction time and the load current. The mapping relationship can be pre-calibrated and stored in the BMS, or stored in other components of the energy storage power supply 1, or stored in a terminal device that is communicatively connected to the energy storage power supply 1. The terminal device includes but is not limited to a mobile phone, a tablet computer, a wearable smart device (smart helmet, smart glasses, smart watch, smart bracelet, etc.), a personal computer, a server, etc.

[0061] Furthermore, in some embodiments, the battery module 3 of the energy storage power supply 1 includes a plurality of battery cells, and the mapping relationship is related to the rated capacity of the energy storage power supply 1 .

[0062] Specifically, the rated capacity (C0) of the energy storage power supply 1 is the total capacity of all battery cells measured under specified conditions at the factory or after standardized testing. It is the maximum amount of electricity that all battery cells can store when fully charged. The unit of rated capacity may be ampere-hours (A·h).

[0063] The discharge rate (C) is the ratio of the load current to the rated capacity (C0). It indicates how many times the C0 is discharged per hour, or the discharge rate. For example, if the rated capacity (C0) is 10A·h and the load current is 2 amperes, the discharge rate is 0.2C, meaning all cells are discharged at 0.2 times the C0 per hour for 5 hours.

[0064] In some examples, the mapping relationship is configured as follows: when the discharge rate is less than 0.5C, that is, when the load current is less than 0.5 times C0, the correction time is 8 minutes; when the discharge rate is greater than or equal to 0.5C and less than or equal to 1C, that is, when the load current is greater than or equal to 0.5 times C0 and less than or equal to 1 times C0, the correction time is 4 minutes; when the discharge rate is greater than 1C, that is, when the load current is greater than 1 times C0, the correction time is 2 minutes. See Table 1 for details.

[0065]

[0066] Table 1

[0067] In an example, the rated capacity C0 of the energy storage power supply 1 is 20A·h. When the load current is less than 0.5 times of C0, that is, when the load current is less than 10A (amperes), the correction time is 8 minutes; when the load current is greater than or equal to 0.5 times of C0 and less than or equal to 1 times of C0, that is, when the load current is greater than or equal to 10A and less than or equal to 20A, the correction time is 4 minutes; when the load current is greater than 1 times of C0, that is, when the load current is greater than 20A, the correction time is 2 minutes.

[0068] In the above embodiment, the mapping relationship can be determined according to the calibrated capacity C0, so that it can adapt to energy storage power supplies 1 of different specifications, and then reasonably configure the correction time to improve the accuracy of the first SOC.

[0069] Furthermore, please combine Figure 3 In some embodiments, step S9 includes:

[0070] Step S91, obtaining a second SOC according to the speed factor and the loading time;

[0071] Step S93, obtaining a third SOC according to the loaded current and the loaded time;

[0072] Step S95 , obtaining the first SOC according to the second SOC and the third SOC.

[0073] Specifically, the speed factor is the ratio between the deviation SOC and the correction time, which means that in the process of correcting the first SOC,

[0074] Correction speed per unit time. For example, the speed factor β can be obtained by the following formula:

[0075] β=SOC(x%) / t

[0076] Here, SOC (x%) represents the deviation SOC, and t represents the correction time.

[0077] The second SOC is the product of the load time and the speed factor, representing the corrected SOC that changes with load time. When the load time equals the correction time, the corrected SOC equals the deviation SOC, and the first SOC correction is complete. For example, if the deviation SOC is 10% and the correction time is 8 minutes, after 2 minutes of load on Energy Storage 1, the second SOC is 2.5%. After 4 minutes of load on Energy Storage 1, the second SOC is 5%. After 8 minutes of load on Energy Storage 1, the second SOC is 10%.

[0078] It is understandable that after the first SOC correction is completed, the energy storage power supply 1 will perform normal SOC calculation and management based on the corrected first SOC.

[0079] The third SOC is the ratio of the product of the load time and the load current to the rated capacity C0 of the energy storage power supply 1, indicating the SOC corresponding to the power consumed by the load current when the energy storage power supply 1 is used under load after the charger is unplugged.

[0080] The first SOC is equal to 100% minus the second SOC and the third SOC. For example, the first SOC can be calculated by the following formula:

[0081] The formula is:

[0082] First SOC=100%-I*t n / C0-β*t n

[0083] Where, I represents the load current, t n Indicates the load time, C0 indicates the rated capacity of the energy storage power supply 1, and β indicates the speed factor.

[0084] In one example, if the rated capacity C0 of energy storage power supply 1 is 10A·h, the deviation SOC is 5%, and the load current is 10A, the correction time is 4 minutes. After energy storage power supply 1 has been loaded for 1 minute, the second SOC is 1.25%, the third SOC is 1%, and the first SOC is 97.75%. After energy storage power supply 1 has been loaded for 2 minutes, the second SOC is 2.5%, the third SOC is 2%, and the first SOC is 95.5%. After energy storage power supply 1 has been loaded for 3 minutes, the second SOC is 3.75%, the third SOC is 3%, and the first SOC is 93.25%. After energy storage power supply 1 has been loaded for 4 minutes, the second SOC is 5%, the third SOC is 4%, and the first SOC is 91%. At this point, the first SOC correction is complete.

[0085] In the above embodiment, the speed factor can ensure that the correction of the first SOC is completed within the correction time, and at the same time ensure that the first SOC changes smoothly during the correction process, thereby improving user experience.

[0086] Furthermore, please combine Figure 4 In certain embodiments, the control method comprises:

[0087] Step S01, when the energy storage power supply 1 is connected to the charger, obtaining a fourth SOC of the energy storage power supply 1;

[0088] Step S01a, when the fourth SOC meets the floating charge condition, controlling the charger to charge the energy storage power supply 1;

[0089] Step S01b: When the fourth SOC does not meet the floating charge condition, control the charger to stop charging the energy storage power supply 1.

[0090] Specifically, the fourth SOC is the SOC corresponding to the remaining power after the energy storage power source 1 is fully charged (SOC=100%) due to the battery power loss caused by the internal static self-consumption power of the energy storage power source 1.

[0091] Float charge is a charging method that is usually used after the battery module 3 of the energy storage power supply 1 is fully charged, and is used to keep the battery module 3 in a fully charged state. Float charge is performed at a lower voltage and current to compensate for the self-consumption of the energy storage power supply 1 and maintain the battery's state of charge (SOC). However, long-term float charge will not only accelerate life attenuation and affect the battery's cycle performance, but will also cause gas production and other phenomena in the battery. In severe cases, safety accidents may occur, greatly increasing the safety risk of battery use. Therefore, by triggering the charger to charge the energy storage power supply 1 when the fourth SOC meets the float charge condition, that is, when the power of the energy storage power supply 1 is depleted to a certain extent, and not charging the energy storage power supply 1 when the fourth SOC does not meet the float charge condition, that is, when the power of the energy storage power supply 1 is not depleted to a certain extent, the charger can effectively reduce the number of float charges and avoid the impact of long-term float charge to a certain extent.

[0092] Furthermore, when the fourth SOC does not meet the float charge conditions, that is, when the energy storage power supply 1 has not lost a certain amount of power, there is a loss of self-consumption power that does not meet the float charge conditions. The SOC value corresponding to the loss of self-consumption power that does not meet the float charge conditions is the deviation SOC, resulting in inaccurate accuracy of the first SOC and, in turn, causing the first SOC to jump. Therefore, when the energy storage power supply 1 does not meet the float charge conditions to trigger charging and there is a deviation SOC, the first SOC can be corrected. That is, the first SOC of the energy storage power supply 1 can be obtained based on the load current, speed factor, and load time during the process of the energy storage power supply 1 being loaded. This effectively reduces the number of float charges while improving the accuracy of the first SOC and, to a certain extent, avoiding the risk of the first SOC jumping.

[0093] In the above embodiment, the number of floating charges can be effectively reduced, the occurrence of negative reactions of the battery under high voltage can be reduced, and the consistency, safety, reliability and life of the energy storage power supply 1 can be improved. At the same time, the accuracy of the first SOC can be improved, and the risk of the first SOC jump can be avoided to a certain extent, thereby avoiding the risk of the first SOC jump to a certain extent, thereby ensuring the effective display of the real-time usage status of the energy storage power supply 1 and ensuring user experience.

[0094] Further, in some embodiments, the float charge condition includes the fourth SOC being less than or equal to a set value.

[0095] Specifically, when the fourth SOC drops to a set value or is lower than the set value, the BMS determines that the energy storage power supply 1 needs to be float charged to compensate for the self-consumption of the internal components of the energy storage power supply 1, thereby triggering the charger to charge the energy storage power supply 1.

[0096] In the above embodiment, when the fourth SOC is less than or equal to the set value, the charger can be triggered to charge the energy storage power supply 1. When the fourth SOC is greater than the set value, the charger does not charge the energy storage power supply 1, thereby effectively reducing the frequency of triggering float charge of the energy storage power supply 1.

[0097] In one embodiment, when the fourth SOC drops to 95%, the BMS sends a charging instruction to the energy storage power supply 1, so that the energy storage power supply 1 turns on the charging switch, so that the charger can charge the energy storage power supply 1, and at the same time sends a display instruction to the energy storage power supply 1 so that the SOC displayed on the user interface is 99%, which can enhance the user's intuitive experience and increase the reliability of the energy storage power supply 1.

[0098] Furthermore, in some embodiments, the set value is greater than or equal to 90% and less than or equal to 95%.

[0099] Specifically, because different energy storage power supplies 1 have different specifications and therefore different rated capacities, setting the set value based on the different specifications and capacities of the energy storage power supplies 1 can ensure that power requirements are met while also avoiding excessive floating charges to a certain extent, thereby improving the user experience and effectively extending the service life of the energy storage power supply 1. Optionally, when the rated capacity of the energy storage power supply 1 is small, the set value is small, and when the rated capacity of the energy storage power supply 1 is large, the set value is large.

[0100] In some examples, the set value is equal to 90%, 91%, 92%, 93%, 94%, 95%, or another value greater than or equal to 90% and less than or equal to 95%.

[0101] In addition, when the fourth SOC does not meet the float charge condition and there is a deviation SOC, the set value is greater than or equal to 90%, which can ensure that the deviation SOC remains within a smaller range, thereby reducing the difficulty of correcting the first SOC and improving the accuracy and effectiveness of the correction.

[0102] In the above embodiment, the limit setting value is greater than or equal to 90% and less than or equal to 95%, which can avoid excessive floating charge to a certain extent and ensure that the power demand is met, while reducing the difficulty of correcting the first SOC and improving the accuracy and effectiveness of the correction.

[0103] In one embodiment, the set value is 95%, and the rated capacity C0 of energy storage power supply 1 is 10A·h. When the fourth SOC drops to 97%, the BMS determines that energy storage power supply 1 does not need float charging and has a deviation SOC of 3% due to self-consumption loss. At this time, the charger is unplugged and loaded with a load current of 10A, and the correction time is 4 minutes. After energy storage power supply 1 has been loaded for 1 minute, the second SOC is 0.75%, the third SOC is 1%, and the first SOC is 98.25%. After energy storage power supply 1 has been loaded for 2 minutes, the second SOC is 1.5%, the third SOC is 2%, and the first SOC is 97.5%. After energy storage power supply 1 has been loaded for 3 minutes, the second SOC is 2.25%, the third SOC is 3%, and the first SOC is 94.75%. After energy storage power supply 1 has been loaded for 4 minutes, the second SOC is 3%, the third SOC is 4%, and the first SOC is 93%. At this point, the first SOC correction is complete.

[0104] Furthermore, please combine Figure 5 In some embodiments, step S01 includes:

[0105] Step S5, obtaining the deviation SOC of the energy storage power supply 1;

[0106] Step S013: Obtain a fourth SOC according to the deviation SOC.

[0107] Specifically, when the energy storage power supply 1 remains connected to the charger after being fully charged, it enters a dormant state. During this dormant state, the electronic components within the energy storage power supply 1 consume a certain amount of static self-consumption power, dissipating the battery's charge until the fourth SOC meets the float charge condition, at which point it enters a charging state. After being fully charged, while remaining connected to the charger, the energy storage power supply 1 enters a dormant state again, repeating this cycle until the charger is unplugged and the load phase begins. If the charger is unplugged during the last dormant phase and the load phase begins, there may be a deviation in the SOC, requiring correction of the first SOC accuracy issue caused by the deviation in the SOC during the last dormant phase.

[0108] The deviation SOC is the ratio of the product of the sleep time and rated current of the last sleep phase to the rated capacity C0 of the energy storage power supply 1. It represents the SOC value corresponding to the amount of battery power consumed by the electronic components within the energy storage power supply 1 at a certain static self-consumption power in the sleep state.

[0109] The speed factor is the ratio between the deviation SOC and the correction time, and represents the correction speed per unit time during the process of correcting the first SOC.

[0110] The fourth SOC is 100% minus the deviation SOC, representing the SOC value corresponding to the remaining capacity after the energy storage power source 1 is fully charged and before the float charge condition is met, after the battery power loss caused by the internal static self-consumption power. For example, if the deviation SOC is 4%, the fourth SOC is 96%.

[0111] In the above embodiment, the fourth SOC can be obtained based on the deviation SOC to determine the float charge condition, so that when the fourth SOC meets the float charge condition, the charger is triggered to charge the energy storage power supply 1, and when the fourth SOC does not meet the float charge condition, the charger does not charge the energy storage power supply 1.

[0112] Furthermore, please combine Figure 6 and Figure 7 In some embodiments, step S5 includes:

[0113] Step S51, obtaining the sleep time and rated current;

[0114] Step S53: Obtain the deviation SOC according to the sleep time and the rated current.

[0115] Specifically, the sleep time refers to the length of time the energy storage power supply 1 is in a sleep state before the float charge condition is met. The rated current refers to the discharge current of each component inside the energy storage power supply 1 measured in a standardized test in the sleep state.

[0116] The deviation SOC is the ratio of the product of the sleep time and the rated current to the rated capacity C0 of the energy storage power supply 1. For example, if the rated current is 20 mA (milliamperes), the sleep time is 40 minutes, and the rated capacity C0 is 10 A·h, the deviation SOC is 8%.

[0117] In the above embodiment, by obtaining the sleep time and the rated current and combining them with the rated capacity C0 of the energy storage power source 1 , the deviation SOC can be accurately calculated, thereby improving the correction effectiveness when correcting the first SOC.

[0118] Furthermore, please combine Figure 8 and Figure 9 In some embodiments, step 5 includes:

[0119] Step S5a: determining the actual SOC of the energy storage power supply 1 based on the cell voltage of the energy storage power supply 1, and obtaining the deviation SOC according to the actual SOC.

[0120] Specifically, the BMS can monitor the cell voltage of the energy storage power supply 1, obtain the current cell voltage value, and based on the collected voltage value, use a preset SOC-voltage correspondence (such as through table lookup or calculation) to determine the actual SOC of the energy storage power supply 1. The deviation SOC can be determined based on the actual SOC. For example, if the SOC value corresponding to the cell voltage of the energy storage power supply 1 is monitored to be 97%, the deviation SOC is the difference between 100% and 97%, that is, the deviation SOC is 3%.

[0121] In the above embodiment, the deviation SOC can be accurately calculated by acquiring the cell voltage of the energy storage power supply 1, thereby improving the correction effectiveness when correcting the first SOC.

[0122] Please refer to Figure 10 A control device 2 according to an embodiment of the present invention includes a processor 22 and a memory 21. The memory 21 stores a computer program. When the computer program is executed by the processor 22, the steps of the control method according to any of the above embodiments are implemented.

[0123] Please refer to Figure 10 An energy storage power supply 1 according to an embodiment of the present invention includes a control device 2 according to the above embodiment. Specifically, the energy storage power supply 1 includes a battery module 3, and the control device 2 is electrically connected to the battery module 3. The control device 2 can be provided in a BMS or connected to the BMS via wired or wireless communication.

[0124] An embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by the processor 22 , the steps of the control method of any of the above embodiments are implemented.

[0125] In some embodiments, when the computer program is executed by the processor 22, the control method implemented includes:

[0126] Step S1, when the energy storage power supply 1 is disconnected from the charger and is in a loaded state, obtaining the loaded current and loaded time of the energy storage power supply 1;

[0127] Step S3, obtaining the correction time of the energy storage power supply 1;

[0128] Step S5, obtaining the deviation SOC of the energy storage power supply 1;

[0129] Step S7, determining a speed factor based on the ratio of the deviation SOC and the correction time;

[0130] Step S9: obtaining a first SOC of the energy storage power supply 1 according to the load current, the speed factor, and the load time until the load time reaches the correction time.

[0131] Throughout this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" indicate that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses 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.

[0132] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable actions for implementing a specific logical function or process step, and the scope of the preferred embodiments of the present invention includes additional 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 invention belong.

[0133] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, combine, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A control method for an energy storage power supply, wherein the energy storage power supply displays a first SOC, characterized in that: The control method includes: When the energy storage power supply is disconnected from the charger and is under load, obtaining the load current and load time of the energy storage power supply; Obtaining a correction time of the energy storage power supply; Obtaining a deviation SOC of the energy storage power supply; determining a speed factor based on a ratio of the deviation SOC and the correction time; Obtaining a first SOC of the energy storage power supply according to the load current, the speed factor, and the load time until the load time reaches the correction time; Acquiring a first SOC of the energy storage power supply according to the load current, the speed factor, and the load time includes: Obtaining a second SOC according to the speed factor and the loading time; acquiring a third SOC according to the loaded current and the loaded time; The first SOC is obtained according to the second SOC and the third SOC.

2. The control method according to claim 1, characterized in that: Obtaining the correction time of the energy storage power supply includes: A correction time of the energy storage power supply is acquired according to the load current, where the correction time is negatively correlated with the load current.

3. The control method according to claim 1, wherein: The control method includes: When the energy storage power supply is connected to the charger, obtaining a fourth SOC of the energy storage power supply; When the fourth SOC satisfies a floating charge condition, controlling the charger to charge the energy storage power supply; When the fourth SOC does not meet the floating charge condition, the charger is controlled to stop charging the energy storage power supply.

4. The control method according to claim 3, characterized in that: The float charge condition includes that the fourth SOC is less than or equal to a set value.

5. The control method according to claim 4, characterized in that: The set value is greater than or equal to 90% and less than or equal to 95%.

6. The control method according to claim 3, characterized in that: When the energy storage power supply is connected to the charger, obtaining a fourth SOC of the energy storage power supply includes: Obtaining a deviation SOC of the energy storage power supply; The fourth SOC is acquired according to the deviation SOC.

7. The control method according to claim 1 or 6, characterized in that: Obtaining the deviation SOC of the energy storage power supply includes: Obtaining the sleep time and rated current of the energy storage power supply; The deviation SOC is obtained according to the sleep time and the rated current.

8. The control method according to claim 1 or 6, characterized in that: Obtaining the deviation SOC of the energy storage power supply includes: The actual SOC of the energy storage power supply is determined based on the cell voltage of the energy storage power supply, and the deviation SOC is obtained according to the actual SOC.

9. A control device for an energy storage power supply, characterized in that: include: processor, and; A memory storing a computer program, wherein the computer program, when executed by the processor, implements the steps of the control method according to any one of claims 1 to 8.

10. An energy storage power supply, characterized in that: Includes the control device according to claim 9.

11. 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 control method according to any one of claims 1 to 8 are implemented.

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