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

Abstract

The invention discloses a control method, a control device, an energy storage power supply and a storage medium. The control method comprises the following steps: when the energy storage power supply is disconnected from the charger and is loaded, acquiring the on-load current and on-load time of the energy storage power supply; acquiring correction time of the energy storage power supply; obtaining the deviation SOC of the energy storage power supply; determining a speed factor based on a ratio of the deviation SOC to the correction time; and obtaining the first SOC of the energy storage power supply according to the on-load current, the speed factor and the on-load time until the on-load time reaches the correction time. According to the control method, the first SOC of the energy storage power supply can be obtained according to the on-load current, the speed factor and the on-load time, so that the accuracy of the first SOC is improved, and the situation that the first SOC jumps in the use process of the energy storage power supply is avoided to a certain extent.

Description

Technical Field

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

[0002] In the related art, when a fully charged energy storage power supply keeps the charging gun connected, it will enter a dormant (standby) state. Due to the limited acquisition accuracy, the BMS of the energy storage power supply will not collect the loss of the energy storage power supply, resulting in a deviation in the accuracy of the monitored SOC. When the energy storage power supply is fully charged for a period of time and the charging gun is unplugged and used with load, the SOC displayed by the energy storage power supply at this time does not match the actual SOC, resulting in a jump 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, and the control method comprises:

[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 the correction time of the energy storage power supply;

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

[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 source 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 first SOC jump during use of the energy storage power supply to a certain extent.

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

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

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

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

[0015] Acquire a third SOC according to the load current and the load time;

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

[0017] In some 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 some embodiments, when the energy storage power supply is connected to the charger, obtaining the fourth SOC of the energy storage power supply includes:

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

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

[0026] In some embodiments, obtaining the deviation SOC of the energy storage power source 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 source 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, when executed by the processor, implements the steps of the control method of any of the above-mentioned 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 given in part in the following description and in part will be obvious from the following description, or will be learned through 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 in conjunction with 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] Fig.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, and 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 from beginning to end. 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 cannot 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, and the control method includes:

[0044] Step S1, when the energy storage power source 1 is disconnected from the charger and is under load, obtaining the load current and load time of the energy storage power source 1;

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

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

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

[0048] Step S9, obtaining a first SOC of the energy storage power source 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 the 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 the change of the load. Exemplarily, the load may include but is not limited to household appliances (such as ovens, induction cookers, baking trays, televisions, refrigerators, etc.), mobile devices (such as smart phones, tablet computers, laptops, cameras or camcorders, etc.).

[0050] The load time refers to the time that the energy storage power supply 1 works 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 and usage decision on the remaining power of the energy storage power supply 1 .

[0053] Specifically, the energy storage power supply 1 includes a battery module 3 and several electronic components (for example, a BMS and an inverter, etc.). When the energy storage power supply 1 is fully charged and the charger is still connected, the energy storage power supply 1 will enter a dormant state. In this state, the electronic components inside the energy storage power supply 1 will consume the battery power at a certain static self-consumption power. However, due to the limited acquisition accuracy of the BMS, it is impossible to monitor the tiny self-consumption current (such as milliampere and microampere level current) in real time. When the energy storage power supply 1 suddenly enters the load stage from the dormant stage, the BMS cannot accurately reflect the actual SOC, which may cause the accuracy of the first SOC to be inaccurate, thereby causing 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 will drop rapidly, causing the change of the SOC to accelerate, thereby increasing the jump probability of the first SOC. In addition, when the battery module 3 is close to a low point, the voltage drop of the battery module 3 tends to become steeper, further increasing the jump probability of 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 and reduce 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 load current, speed factor and load 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 caused 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 use 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 avoiding the first SOC jump during use of the energy storage power supply 1 to a certain extent.

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

[0057] Step S31, obtaining the correction time of the energy storage power source 1 according to the load current, and the correction time is negatively correlated with the load current.

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

[0059] In the above implementation, the correction time can be determined according to the mapping relationship between time and current and the load current, so as to ensure that the first SOC change of the energy storage power supply 1 can maintain stability and timeliness under different load current conditions. Specifically, under small load current, the energy storage power supply 1 discharges slowly, and the change of SOC is also small. The longer correction time can ensure the smooth change of the first SOC when correcting the first SOC, thereby improving the user experience. Under large load current, the energy storage power supply 1 discharges quickly, and the change of SOC is also large. The shorter correction time can quickly correct the first SOC, thereby reflecting the real SOC in a timely and accurate manner.

[0060] Exemplarily, 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 connected to the energy storage power supply 1 for communication, and 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 cells measured under specified conditions when leaving the factory or after standardized testing. It is the maximum amount of electricity that can be stored in all cells under fully charged conditions. The unit of the rated capacity can be ampere-hour (A·h).

[0063] The discharge rate C is the ratio between the load current and the rated capacity C0, which means how many times C0 is discharged per hour, that is, the discharge rate. For example, the rated capacity C0 = 10A·h, the load current is 2 amperes, and the discharge rate is 0.2C, which means that all cells are discharged at 0.2 times C0 per hour, which can last 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 (ampere), 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 implementation, 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 a speed factor and a loading time;

[0071] Step S93, obtaining a third SOC according to the load current and the load 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, indicating 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 loading time and the speed factor, which indicates the corrected SOC that changes with the loading time. When the loading time is equal to the correction time, the corrected SOC is equal to the deviation SOC, at which point the first SOC correction is complete. For example, if the deviation SOC is 10% and the correction time is 8 minutes, the second SOC is 2.5% after the energy storage power supply 1 is loaded for 2 minutes, the second SOC is 5% after the energy storage power supply 1 is loaded for 4 minutes, and the second SOC is 10% after the energy storage power supply 1 is loaded for 8 minutes.

[0078] It can be understood 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 source 1, indicating the SOC corresponding to the power consumed by the load current when the energy storage power source 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 represents the load time, C0 represents the rated capacity of the energy storage power source 1, and β represents the speed factor.

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

[0085] In the above implementation, 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 of the first SOC, thereby improving the user experience.

[0086] Furthermore, please combine Figure 4 In some 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 source 1.

[0090] Specifically, the fourth SOC is the SOC corresponding to the remaining power after the energy storage power source 1 is connected to a charger and fully charged (SOC=100%) and after the battery power is lost due to the static self-consumption power inside the energy storage power source 1.

[0091] Floating charge is a charging method, which 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. Floating charge is charged at a lower voltage and current to compensate for the self-consumption of the energy storage power supply 1 and maintain the state of charge (SOC) of the battery. However, long-term floating charge will not only accelerate the life decay and affect the cycle performance of the battery, but also cause the battery to produce gas and other phenomena. 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 floating charge condition, that is, when the power of the energy storage power supply 1 is depleted to a certain extent, and when the fourth SOC does not meet the floating charge condition, that is, when the power of the energy storage power supply 1 is not depleted to a certain extent, the charger does not charge the energy storage power supply 1, which can effectively reduce the number of floating charges and avoid the impact of long-term floating charge to a certain extent.

[0092] In addition, because the fourth SOC does not meet the floating charge condition, that is, when the power of the energy storage power supply 1 has not been consumed to a certain extent, there is a power loss of self-consumption power that does not meet the floating charge condition. The SOC value corresponding to the power loss of self-consumption power that does not meet the floating charge condition is the deviation SOC, which leads to inaccurate accuracy of the first SOC, and then causes the first SOC jump phenomenon. Therefore, when the energy storage power supply 1 does not meet the floating charge condition 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 is obtained according to the load current, speed factor and load time during the process of the energy storage power supply 1 being loaded, thereby effectively reducing the number of floating charges while improving the accuracy of the first SOC, and avoiding the risk of the first SOC jump to a certain extent.

[0093] In the above implementation, the number of floating charges can be effectively reduced, the occurrence of negative reactions of the battery under high voltage can be reduced, the consistency of use, safety, reliability and life of the energy storage power supply 1 can be improved, and 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 use status of the energy storage power supply 1 and ensuring the 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 components inside the energy storage power supply 1, thereby triggering the charger to charge the energy storage power supply 1.

[0096] In the above implementation, 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, and 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 floating 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] Further, in some embodiments, the set value is greater than or equal to 90% and less than or equal to 95%.

[0099] Specifically, since different energy storage power supplies 1 have different specifications, their rated capacities are different. Setting the set value according to the different specifications and capacities of the energy storage power supply 1 can ensure that the power demand is met, while avoiding excessive floating charge 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 other values ​​greater than or equal to 90% and less than or equal to 95%.

[0101] In addition, when the fourth SOC does not meet the floating 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 implementation, 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%, the rated capacity C0 of the energy storage power supply 1 is 10A·h, and when the fourth SOC drops to 97%, the BMS determines that the energy storage power supply 1 does not need to be float charged, and there is a deviation SOC of self-consumption power loss, and the deviation SOC is 3%. At this time, unplug the charger for loading, and the load current is 10A, then the correction time is 4 minutes. When the energy storage power supply 1 is loaded for 1 minute, the second SOC is 0.75%, the third SOC is 1%, and the first SOC is 98.25%; when the energy storage power supply 1 is loaded for 2 minutes, the second SOC is 1.5%, the third SOC is 2%, and the first SOC is 97.5%; when the energy storage power supply 1 is loaded for 3 minutes, the second SOC is 2.25%, the third SOC is 3%, and the first SOC is 94.75%; when the energy storage power supply 1 is loaded for 4 minutes, the second SOC is 3%, the third SOC is 4%, and the first SOC is 93%. At this time, the correction of the first SOC is completed.

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

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

[0106] Step S013, obtaining a fourth SOC according to the deviation SOC.

[0107] Specifically, when the energy storage power supply 1 is fully charged and still in the charging connection state, the energy storage power supply 1 will enter the dormant state. In the dormant state, the electronic components inside the energy storage power supply 1 consume the battery power with a certain static self-consumption power in the dormant state until the fourth SOC meets the floating charge condition, and then enter the charging state. After being fully charged, the energy storage power supply 1 is still in the charging connection state, and it will enter the dormant state again, and the cycle will repeat until the charger is unplugged and the load stage is entered. In the case of unplugging the charger in the last dormant stage and entering the load stage, there may be a deviation SOC, and the first SOC accuracy problem caused by the deviation SOC in the last dormant stage needs to be corrected.

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

[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, which indicates the SOC value corresponding to the remaining power after the energy storage power source 1 is fully charged and before the floating charge condition is met, after the battery power is lost due to its internal static self-consumption power. For example, if the deviation SOC is 4%, the fourth SOC is 96%.

[0111] In the above implementation, the fourth SOC can be obtained according to the deviation SOC to determine the floating charge condition, so that when the fourth SOC meets the floating charge condition, the charger is triggered to charge the energy storage power supply 1, and when the fourth SOC does not meet the floating 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 comprises:

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

[0114] Step S53, obtaining a deviation SOC according to the sleep time and the rated current.

[0115] Specifically, the sleep time refers to the length of time that the energy storage power supply 1 is in a sleep state before the floating charge condition is met. The rated current refers to the discharge current measured in a standardized test of each component inside the energy storage power supply 1 in a 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 source 1. For example, if the rated current is 20 mA (milliamperes), the sleep time is 40 minutes, and the rated capacity C0 is 10A·h, the deviation SOC is 8%.

[0117] In the above implementation, by obtaining the sleep time and the rated current, and combining 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 Fig. 9 In some embodiments, step 5 comprises:

[0119] Step S5a, determining the actual SOC of the energy storage power source 1 based on the cell voltage of the energy storage power source 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 the preset SOC-voltage correspondence (such as by looking up a table or calculation) to determine the actual SOC of the energy storage power supply 1. The deviation SOC can be determined according to 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 implementation, the deviation SOC can be accurately calculated by acquiring the cell voltage of the energy storage power source 1, thereby improving the correction effectiveness when correcting the first SOC.

[0122] Please refer to Fig.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 of any of the above embodiments are implemented.

[0123] Please refer to Fig.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 arranged in a BMS, or connected to the BMS by wired or wireless communication.

[0124] An embodiment of the present invention provides a computer-readable storage medium on which a computer program is stored. 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 source 1 is disconnected from the charger and is under load, obtaining the load current and load time of the energy storage power source 1;

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

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

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

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

[0131] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[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 alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.

[0133] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of 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 comprises: 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 a deviation SOC of the energy storage power source; determining a speed factor based on a ratio of the deviation SOC and the correction time; A first SOC of the energy storage power source is obtained according to the load current, the speed factor and the load time until the load time reaches the correction time.

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, and the correction time is negatively correlated with the load current.

3. The control method according to claim 1, characterized in that: Acquiring a first SOC of the energy storage power supply according to the load current, the speed factor, and the load time includes: Acquire a second SOC according to the speed factor and the loading time; Acquire a third SOC according to the load current and the load time; The first SOC is acquired according to the second SOC and the third SOC.

4. The control method according to claim 1, characterized in that: The control method comprises: 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.

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

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

7. The control method according to claim 4, 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 source; The fourth SOC is acquired according to the deviation SOC.

8. The control method according to claim 1 or 7, 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.

9. The control method according to claim 1 or 7, 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.

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

11. An energy storage power supply, characterized in that: Comprising the control device as claimed in claim 10.

12. 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 9 are implemented.

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