Energy storage battery correction method, energy storage battery correction device and energy storage system

Abstract

The invention relates to the technical field of energy storage equipment, and provides an energy storage battery correction method, an energy storage battery correction device and an energy storage system.The energy storage battery correction method comprises the steps that the voltage jump state of an energy storage battery is determined according to multiple first maximum cell voltages; obtaining the current first real residual electric quantity of the energy storage battery; under the condition that the voltage jump of the energy storage battery occurs and the difference value between the first real residual electric quantity and the displayed electric quantity is greater than a first threshold value, correcting the displayed electric quantity according to the first real residual electric quantity and a first correction strategy; and when the voltage jump does not occur in the energy storage battery and the difference value between the first real residual electric quantity and the displayed electric quantity is smaller than or equal to a first threshold value, correcting the displayed electric quantity according to the first real residual electric quantity and a second correction strategy. According to the correction method of the energy storage battery, the timeliness and the accuracy of display electric quantity correction can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage equipment, and in particular to a correction method for an energy storage battery, a correction device for an energy storage battery, and an energy storage system. Background Art

[0002] Lithium-ion energy storage batteries have been widely used in energy storage applications due to their high energy density and long cycle life. Accurately estimating the state of charge (SOC) of energy storage batteries plays a key role in grid dispatching, energy management, and energy storage battery life optimization. However, due to the complex electrochemical behavior of lithium-ion energy storage batteries during the charging and discharging process, it is very challenging to accurately estimate the true SOC, and the true SOC may jump or fall back when it undergoes correction. In related technologies, methods such as Coulomb integration method, open circuit voltage method, model-based algorithm, and dynamic voltage calibration method are usually used to estimate the true SOC, and then the displayed power of the energy storage battery is corrected. However, during the operation of the energy storage battery, since the voltage is greatly affected by factors such as polarization and current mutation under dynamic conditions, these methods may have serious errors in estimating the true SOC, resulting in untimely correction of the displayed power, thereby causing phenomena such as SOC jumps. Summary of the invention

[0003] The present application aims to at least solve the technical problem in the prior art that the correction method for displaying the power is not timely.

[0004] To this end, a first aspect of the present application is to propose a correction method for an energy storage battery.

[0005] A second aspect of the present application is to provide a correction device for an energy storage battery.

[0006] The third aspect of the present application is to provide an energy storage system.

[0007] In view of this, according to the first aspect of the present application, a correction method for an energy storage battery is proposed, which is used to correct the displayed power of the energy storage battery. The correction method for the energy storage battery includes: during the operation of the energy storage battery, obtaining multiple first maximum battery cell voltages of the energy storage battery according to preset time intervals; determining the voltage jump state of the energy storage battery according to the multiple first maximum battery cell voltages; obtaining the current first real remaining power of the energy storage battery; when the energy storage battery undergoes a voltage jump and the difference between the first real remaining power and the displayed power is greater than a first threshold, correcting the displayed power according to the first real remaining power and a first correction strategy; when the energy storage battery does not undergo a voltage jump and the difference between the first real remaining power and the displayed power is less than or equal to the first threshold, correcting the displayed power according to the first real remaining power and a second correction strategy; wherein the correction speed of the displayed power under the first correction strategy is higher than the correction speed of the displayed power under the second correction strategy.

[0008] The correction method of the energy storage battery provided in the present application can be used to correct the displayed power of the energy storage battery. That is, when there is a difference between the remaining power displayed by the energy storage battery and the actual remaining power of the energy storage battery, the displayed power of the energy storage battery can be corrected to ensure the accuracy of the displayed power of the energy storage battery, thereby ensuring that the user can accurately understand the current power of the energy storage battery.

[0009] Specifically, during the operation of the energy storage battery, the voltage jump state of the energy storage battery can be determined according to the operating parameters of the energy storage battery, that is, it is judged whether a voltage jump phenomenon occurs in the energy storage battery during operation, and then according to whether a voltage jump phenomenon occurs in the energy storage battery, the displayed voltage of the energy storage battery is corrected with different correction strategies to improve the accuracy of the displayed voltage correction.

[0010] To determine whether a voltage jump phenomenon occurs in the energy storage battery during operation, first, during the operation of the energy storage battery, that is, during the charging or discharging of the energy storage battery, first obtain multiple first maximum cell voltages of the energy storage battery according to a preset time interval. It can be understood that the energy storage battery usually includes multiple cells, and the first maximum cell voltage is the voltage value of the cell with the highest voltage value among the multiple cells. During the operation of the energy storage battery, multiple first maximum cell voltages can be obtained in sequence according to the preset time interval. Further, it can be determined whether a voltage jump phenomenon occurs in the energy storage battery based on multiple first maximum cell voltages, that is, during the operation of the energy storage battery, it can be determined whether a voltage jump phenomenon occurs in the energy storage battery based on the change process of the first maximum cell voltage.

[0011] Further, after determining whether a voltage jump occurs in the energy storage battery, different correction strategies can be used to correct the displayed voltage of the energy storage battery according to whether a voltage jump occurs in the energy storage battery. Specifically, first, it is necessary to obtain the first real remaining power of the energy storage battery, that is, the real remaining power of the energy storage battery at the current moment. Then, when a voltage jump occurs in the energy storage battery, and the difference between the first real remaining power of the energy storage battery and the displayed power is greater than a first preset value, the first correction strategy can be used to correct the displayed voltage of the energy storage battery. On the contrary, when no voltage jump occurs in the energy storage battery, and the difference between the first real remaining power of the energy storage battery and the displayed power is less than or equal to the first preset value, the second correction strategy can be used to correct the displayed power of the energy storage battery. Among them, the correction speed of the displayed power under the first correction strategy is higher than the correction speed of the displayed power under the second correction strategy.

[0012] It can be understood that, when the energy storage battery undergoes a voltage jump, and the difference between the first real remaining power of the energy storage battery and the displayed power is greater than the first preset value, it means that the current displayed power of the energy storage battery differs greatly from the first real remaining power of the energy storage battery, and the energy storage battery is in a jump state, and the power of the energy storage battery changes rapidly. Therefore, a faster first correction strategy can be used to correct the displayed voltage to achieve rapid and accurate correction of the displayed power. On the contrary, when the energy storage battery does not undergo a voltage jump, and the difference between the first real remaining power of the energy storage battery and the displayed power is less than or equal to the first preset value, it means that the aberration between the displayed power of the energy storage battery and the first real remaining power is small, and the power of the energy storage battery changes relatively slowly. At this time, a slower second correction strategy can be used to correct the displayed voltage to ensure the accuracy of the displayed voltage correction.

[0013] The correction method of the energy storage battery provided by the present invention, before correcting the displayed power of the energy storage battery, first obtains multiple first maximum cell voltages of the energy storage battery according to a preset time interval, and then determines whether the energy storage battery has a voltage jump phenomenon according to the first maximum cell voltages, and then uses the first correction strategy or the second correction strategy to correct the displayed voltage according to whether the energy storage battery has a voltage jump phenomenon. That is, when the energy storage battery has a voltage jump phenomenon, the first correction strategy with a faster speed is used for correction, which can ensure the correction speed and accuracy of the remaining power, so that the displayed voltage can be corrected in time and accurately, and the accuracy of the displayed voltage can be ensured. When the energy storage battery does not have a voltage jump phenomenon, the second correction strategy can be used to ensure the accuracy of the correction of the displayed power.

[0014] According to a second aspect of the present application, a correction device for an energy storage battery is provided, which is used to correct the displayed power of the energy storage battery. The correction device for the energy storage battery includes: an acquisition unit, which is used to acquire multiple first maximum cell voltages of the energy storage battery according to preset time intervals during the operation of the energy storage battery; a determination unit, which is used to determine the voltage jump state of the energy storage battery according to the multiple first maximum cell voltages; the acquisition unit is also used to acquire the current first real remaining power of the energy storage battery; a correction unit, which is used to correct the displayed power according to the first real remaining power and a first correction strategy when a voltage jump occurs in the energy storage battery and the difference between the first real remaining power and the displayed power is greater than a first threshold; and when no voltage jump occurs in the energy storage battery and the difference between the first real remaining power and the displayed power is less than or equal to the first threshold, correct the displayed power according to the first real remaining power and the second correction strategy; wherein the correction speed of the displayed power under the first correction strategy is higher than the correction speed of the displayed power under the second correction strategy.

[0015] The correction device for the energy storage battery provided in the present application first obtains a plurality of first maximum cell voltages of the energy storage battery according to a preset time interval before correcting the displayed power of the energy storage battery, and then determines whether a voltage jump phenomenon occurs in the energy storage battery according to the first maximum cell voltages, and then uses the first correction strategy or the second correction strategy to correct the displayed voltage according to whether a voltage jump phenomenon occurs in the energy storage battery. That is, when a voltage jump phenomenon occurs in the energy storage battery, the first correction strategy with a faster speed is used for correction, which can ensure the correction speed and accuracy of the remaining power, so that the displayed voltage can be corrected in a timely and accurate manner to ensure the accuracy of the displayed voltage. When the energy storage battery does not experience a voltage jump phenomenon, the second correction strategy can be used to ensure the accuracy of the correction of the displayed power.

[0016] According to the third aspect of the present application, an energy storage system is proposed, comprising: an inverter for converting direct current into alternating current, or converting alternating current into direct current; an energy storage battery connected to the inverter, the energy storage battery comprising a correction device for the energy storage battery as described in the above technical solution.

[0017] The energy storage system provided in the present application includes an inverter and an energy storage battery. Since the energy storage battery includes a correction device for the energy storage battery as in the above-mentioned technical solution, the energy storage system has all the beneficial effects of the correction device for the energy storage battery in any of the above-mentioned technical solutions, which will not be repeated here.

[0018] Additional aspects and advantages of the present application will become apparent in the following description or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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:

[0020] Figure 1 One of the flow charts of the method for correcting the energy storage battery according to the embodiment of the present application is shown;

[0021] Figure 2 A second flow chart of a method for correcting an energy storage battery according to an embodiment of the present application is shown;

[0022] Figure 3 The third flowchart of the method for correcting the energy storage battery according to the embodiment of the present application is shown;

[0023] Figure 4 A fourth flow chart of a method for correcting an energy storage battery according to an embodiment of the present application is shown;

[0024] Figure 5 A fifth flow chart of a method for correcting an energy storage battery according to an embodiment of the present application is shown;

[0025] Figure 6 A sixth flow chart of a method for correcting an energy storage battery according to an embodiment of the present application is shown;

[0026] Figure 7 A structural block diagram of a correction device for an energy storage battery according to an embodiment of the present application is shown;

[0027] Figure 8 A structural block diagram of an energy storage system according to an embodiment of the present application is shown.

[0028] Reference numerals:

[0029] 700 correction device for energy storage battery, 702 acquisition unit, 704 determination unit, 706 correction unit, 800 energy storage system, 802 inverter, 804 energy storage battery. DETAILED DESCRIPTION

[0030] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0032] Combine the following Figures 1 to 8, the energy storage battery correction method, energy storage battery correction device and energy storage system provided in the embodiments of the present application are described in detail through specific embodiments and their application scenarios.

[0033] like Figure 1 As shown, an embodiment of the present application provides a method for correcting an energy storage battery, which is used to correct the displayed power of the energy storage battery, and the correction includes:

[0034] Step 102, during the operation of the energy storage battery, obtaining a plurality of first maximum cell voltages of the energy storage battery according to a preset time interval;

[0035] Step 104, determining a voltage transition state of the energy storage battery according to a plurality of first maximum battery cell voltages;

[0036] Step 106, obtaining a current first real remaining power of the energy storage battery;

[0037] Step 108, when a voltage jump occurs in the energy storage battery and the difference between the first real remaining power and the displayed power is greater than a first threshold, correct the displayed power according to the first real remaining power and the first correction strategy;

[0038] Step 110, when there is no voltage jump in the energy storage battery and the difference between the first real remaining power and the displayed power is less than or equal to the first threshold, the displayed power is corrected according to the first real remaining power and the second correction strategy.

[0039] The correction speed of the displayed power under the first correction strategy is higher than the correction speed of the displayed power under the second correction strategy.

[0040] The correction method of the energy storage battery provided in the present application can be used to correct the displayed power of the energy storage battery. That is, when there is a difference between the remaining power displayed by the energy storage battery and the actual remaining power of the energy storage battery, the displayed power of the energy storage battery can be corrected to ensure the accuracy of the displayed power of the energy storage battery, thereby ensuring that the user can accurately understand the current power of the energy storage battery.

[0041] Specifically, during the operation of the energy storage battery, the voltage jump state of the energy storage battery can be determined according to the operating parameters of the energy storage battery, that is, it is judged whether a voltage jump phenomenon occurs in the energy storage battery during operation, and then according to whether a voltage jump phenomenon occurs in the energy storage battery, the displayed voltage of the energy storage battery is corrected with different correction strategies to improve the accuracy of the displayed voltage correction.

[0042] To determine whether a voltage jump phenomenon occurs in the energy storage battery during operation, first, during the operation of the energy storage battery, that is, during the charging or discharging of the energy storage battery, first obtain multiple first maximum cell voltages of the energy storage battery according to a preset time interval. It can be understood that the energy storage battery usually includes multiple cells, and the first maximum cell voltage is the voltage value of the cell with the highest voltage value among the multiple cells. During the operation of the energy storage battery, multiple first maximum cell voltages can be obtained in sequence according to the preset time interval. Further, it can be determined whether a voltage jump phenomenon occurs in the energy storage battery based on multiple first maximum cell voltages, that is, during the operation of the energy storage battery, it can be determined whether a voltage jump phenomenon occurs in the energy storage battery based on the change process of the first maximum cell voltage.

[0043] Further, after determining whether a voltage jump occurs in the energy storage battery, different correction strategies can be used to correct the displayed voltage of the energy storage battery according to whether a voltage jump occurs in the energy storage battery. Specifically, first, it is necessary to obtain the first real remaining power of the energy storage battery, that is, the real remaining power of the energy storage battery at the current moment. Then, when a voltage jump occurs in the energy storage battery, and the difference between the first real remaining power of the energy storage battery and the displayed power is greater than a first preset value, the first correction strategy can be used to correct the displayed voltage of the energy storage battery. On the contrary, when no voltage jump occurs in the energy storage battery, and the difference between the first real remaining power of the energy storage battery and the displayed power is less than or equal to the first preset value, the second correction strategy can be used to correct the displayed power of the energy storage battery. Among them, the correction speed of the displayed power under the first correction strategy is higher than the correction speed of the displayed power under the second correction strategy.

[0044] It can be understood that, when the energy storage battery undergoes a voltage jump, and the difference between the first real remaining power of the energy storage battery and the displayed power is greater than the first preset value, it means that the current displayed power of the energy storage battery differs greatly from the first real remaining power of the energy storage battery, and the energy storage battery is in a jump state, and the power of the energy storage battery changes rapidly. Therefore, a faster first correction strategy can be used to correct the displayed voltage to achieve rapid and accurate correction of the displayed power. On the contrary, when the energy storage battery does not undergo a voltage jump, and the difference between the first real remaining power of the energy storage battery and the displayed power is less than or equal to the first preset value, it means that the aberration between the displayed power of the energy storage battery and the first real remaining power is small, and the power of the energy storage battery changes relatively slowly. At this time, a slower second correction strategy can be used to correct the displayed voltage to ensure the accuracy of the displayed voltage correction.

[0045] The correction method of the energy storage battery provided by the present invention, before correcting the displayed power of the energy storage battery, first obtains multiple first maximum cell voltages of the energy storage battery according to a preset time interval, and then determines whether the energy storage battery has a voltage jump phenomenon according to the first maximum cell voltages, and then uses the first correction strategy or the second correction strategy to correct the displayed voltage according to whether the energy storage battery has a voltage jump phenomenon. That is, when the energy storage battery has a voltage jump phenomenon, the first correction strategy with a faster speed is used for correction, which can ensure the correction speed and accuracy of the remaining power, so that the displayed voltage can be corrected in a timely and accurate manner to ensure the accuracy of the displayed voltage. When the energy storage battery does not have a voltage jump phenomenon, the second correction strategy can be used to ensure the accuracy of the correction of the displayed power.

[0046] like Figure 2 As shown, an embodiment of the present application provides a method for correcting an energy storage battery, comprising:

[0047] Step 202, during the operation of the energy storage battery, obtaining a plurality of first maximum cell voltages of the energy storage battery according to a preset time interval;

[0048] Step 204, determining a voltage difference between two adjacent first maximum battery cell voltages according to the plurality of first maximum battery cell voltages;

[0049] Step 206, determining a transition coefficient according to a plurality of voltage differences and a preset time interval;

[0050] Step 208, determining a first transition coefficient greater than or equal to a second threshold value among the multiple transition coefficients;

[0051] Step 210, when the number of consecutive occurrences of the first transition coefficient is greater than or equal to a third threshold, determining that a voltage transition occurs in the energy storage battery;

[0052] Step 212, when the number of consecutive occurrences of the first transition coefficient is less than a third threshold, determining that no voltage transition occurs in the energy storage battery;

[0053] Step 214, obtaining the current first real remaining power of the energy storage battery;

[0054] Step 216, when a voltage jump occurs in the energy storage battery and the difference between the first real remaining power and the displayed power is greater than a first threshold, the displayed power is corrected according to the first real remaining power and the first correction strategy;

[0055] Step 218, when there is no voltage jump in the energy storage battery and the difference between the first real remaining power and the displayed power is less than or equal to the first threshold, the displayed power is corrected according to the first real remaining power and the second correction strategy.

[0056] The correction speed of the displayed power under the first correction strategy is higher than the correction speed of the displayed power under the second correction strategy.

[0057] In this embodiment, to determine whether a voltage jump occurs in the energy storage battery, the voltage difference between two adjacent first maximum battery cell voltages may be first determined, and then a jump coefficient may be determined according to each voltage difference and a preset time interval. Then, among the multiple jump coefficients, a first jump coefficient having a value greater than or equal to a second threshold value is determined, and the number of consecutive occurrences of the first jump coefficient is determined. Finally, if the number of consecutive occurrences of the first jump coefficient is greater than or equal to a third threshold value, it may be determined that a voltage jump phenomenon occurs in the energy storage battery. On the contrary, if the number of consecutive occurrences of the first jump coefficient is less than the third threshold value, it may be determined that a voltage jump phenomenon does not occur in the energy storage battery.

[0058] It can be understood that the jump coefficient is determined according to the voltage difference and the preset time interval, which can reflect the rate of change of the first maximum cell voltage of the energy storage battery within a time interval. If the jump coefficient is greater than or equal to the second threshold, it means that the first maximum cell voltage changes rapidly within a time interval. At the same time, if the number of consecutive occurrences of the first jump coefficient is greater than or equal to the third threshold, it means that the first maximum cell voltage changes rapidly within a period of time. At this time, it can be determined that the rate of change of the first maximum cell voltage of the energy storage battery is too fast, that is, it is determined that the energy storage battery has a voltage jump phenomenon. At this time, according to the first real remaining power of the energy storage battery and the first correction strategy, the displayed power of the energy storage battery can be quickly corrected, and the accuracy of the displayed power correction can be ensured.

[0059] On the contrary, if the number of times the first jump coefficient appears continuously is less than the third threshold value, it means that the change rate of the first maximum cell voltage of the energy storage battery is not too fast within a period of time, and it can be determined that the energy storage battery does not have a voltage jump phenomenon. At this time, the displayed power of the energy storage battery can be corrected according to the first real remaining power of the energy storage battery and the second correction strategy to ensure the accuracy of the displayed power correction.

[0060] Furthermore, the transition coefficient can be determined according to the ratio between the voltage difference and the preset time interval. Specifically, the transition coefficient can be determined according to the preset formula K=Δt1 / ΔV1; wherein K is the transition coefficient, Δt1 is the preset time interval, and ΔV1 is the voltage difference. K greater than or equal to the second threshold is determined as the first transition coefficient. When the number of consecutive occurrences of K greater than or equal to the second threshold is greater than or equal to the third threshold, it can be determined that the voltage transition phenomenon occurs in the current energy storage battery. Specifically, the third threshold can be set according to the preset time interval. When the preset time interval is short, the third threshold can be set to a larger value, such as 15, 20 or 30. When the preset time interval is longer, the third threshold can be set to 5, 8 or 10.

[0061] like Figure 3 As shown, an embodiment of the present application provides a method for correcting an energy storage battery, comprising:

[0062] Step 302, during the operation of the energy storage battery, obtaining a plurality of first maximum cell voltages of the energy storage battery according to a preset time interval;

[0063] Step 304, determining a voltage transition state of the energy storage battery according to a plurality of first maximum battery cell voltages;

[0064] Step 306, obtaining the operating current of the energy storage battery at the current moment;

[0065] Step 308, determining a first real remaining power according to a preset formula: SOCreal(k+1)=SOCreal(k)+η×Isamp×Δt÷Qmax;

[0066] Step 310, when a voltage jump occurs in the energy storage battery and the difference between the first real remaining power and the displayed power is greater than a first threshold, correct the displayed power according to the first real remaining power and a first correction strategy;

[0067] Step 312: When the energy storage battery does not experience a voltage jump and the difference between the first real remaining power and the displayed power is less than or equal to the first threshold, the displayed power is corrected according to the first real remaining power and the second correction strategy.

[0068] In this embodiment, in the process of determining the first real remaining power of the energy storage battery at the current moment, the operating current of the energy storage battery at the current moment can be obtained first, and then the first real remaining power can be determined according to the preset formula: SOCreal(k+1)=SOCreal(k)+η×Isamp×Δt÷Qmax.

[0069] Among them, SOCreal(k+1) is the first real remaining power that needs to be determined at the current moment, SOCreal(k) is the remaining power of the energy storage battery at the previous moment, η is the coulomb efficiency, and its value range can be between 0.99 and 1, that is, it satisfies 0.99<η<1. Isamp is the operating current, Δt is the time interval between the current moment and the previous moment, and Qmax is the maximum capacity of the energy storage battery.

[0070] like Figure 4 As shown, an embodiment of the present application provides a method for correcting an energy storage battery, comprising:

[0071] Step 402, during the operation of the energy storage battery, obtaining a plurality of first maximum cell voltages of the energy storage battery according to a preset time interval;

[0072] Step 404, determining a voltage transition state of the energy storage battery according to a plurality of first maximum battery cell voltages;

[0073] Step 406, obtaining a current first real remaining power of the energy storage battery;

[0074] Step 408, when a voltage jump occurs in the energy storage battery and the difference between the first real remaining power and the displayed power is greater than a first threshold, obtaining a plurality of voltage correction points during the operation of the energy storage battery;

[0075] Step 410, determining a compensation coefficient according to the number of voltage correction points passed during the operation of the energy storage battery;

[0076] Step 412, determining a compensation current according to the operating current, the first real remaining power and the displayed power;

[0077] Step 414, determining the target display power according to the time interval between the current moment and the previous moment, the compensation coefficient and the compensation current;

[0078] Step 416, correcting the displayed power to the target displayed power;

[0079] Step 418, when the energy storage battery does not experience a voltage jump and the difference between the first real remaining power and the displayed power is less than or equal to the first threshold, determine the compensation current according to the operating current, the first real remaining power and the displayed power;

[0080] Step 420, determining the target display power according to the time interval between the current moment and the previous moment and the compensation current;

[0081] Step 422: Correct the displayed power level to the target displayed power level.

[0082] In this embodiment, when the energy storage battery voltage jump occurs and the difference between the first real remaining power and the displayed power is greater than the first threshold, multiple voltage correction points during the operation of the energy storage battery can be obtained first, and then the compensation coefficient can be determined according to the number of voltage correction points passed during the operation of the energy storage battery. Further, the compensation current is determined according to the operating current, the first real remaining power and the displayed power; finally, the target displayed power is determined according to the time interval between the current moment and the previous moment, the compensation coefficient and the compensation current.

[0083] Exemplarily, taking the charging operation of the energy storage battery as an example, at the current moment, when the number of correction points passed during the operation of the energy storage battery is less than or equal to 1, the compensation coefficient is determined to be 2; when the number of correction points passed during the operation of the energy storage battery is greater than 1, the compensation coefficient is determined according to the preset formula Gain=L×[SOCcalib(k+1)-SOCcalib(k)]÷[SOCuncalib(k+1)-SOCcalib(K)]; wherein L is a weighting coefficient of 0.6 to 0.95, Gain is the compensation coefficient, SOCcalib(k+1) is the voltage correction value of the energy storage battery at the current moment, SOCcalib(k) is the voltage correction value of the energy storage battery at the previous moment, and SOCuncalib(k+1) is the voltage value of the energy storage battery at the current moment without correction.

[0084] Further, the compensation current is determined according to the operating current, the first real remaining capacity and the displayed capacity; specifically, the compensation current can be determined according to the preset formula: Icomp=max[(1+n)×Isamp, 2×Isamp], where Icomp is the compensation current, Isamp is the operating current, n=[|SOCreal(k)-SOCdisp(k)|÷ΔSOCthod], SOCreal(k) is the remaining capacity of the energy storage battery at the previous moment, SOCdisp(k) is the displayed capacity, and ΔSOCthod=100%-SOCreal. That is, the compensation current Icomp is the larger one of (1+n)×Isamp and 2×Isamp. That is, the value of the compensation current Icomp is greater than the current operating current; wherein, n can be calculated using the following formula, n = [|SOCreal(k)-SOCdisp(k)|÷ΔSOCthod], SOCreal(k) is the remaining power of the energy storage battery at the previous moment, SOCdisp(k) is the displayed power, ΔSOCthod = 100%-SOCreal, SOCreal is the actual remaining power at the current moment.

[0085] Finally, the target displayed power is determined according to the time interval between the current moment and the previous moment, the compensation coefficient and the compensation current; specifically, the corrected target displayed power can be determined according to the preset formula SOCdisp(k+1)=SOCdisp(k)+η×Gain×Icomp×Δt÷Qmax. Among them, Gain is the compensation coefficient, SOCdisp(k+1) is the target displayed power, and SOCdisp(k) is the displayed power. η is the coulomb efficiency, and its value range can be between 0.99 and 1, that is, it satisfies 0.99<η<1. Gain is the compensation coefficient, and Icomp is the compensation current.

[0086] In addition, it should be noted that the compensation coefficient and compensation current satisfy: k1×Isamp≤Gain×Icomp≤k2×Irated, where Gain is the compensation coefficient, Icomp is the compensation current, k1 and k2 are set according to the correction speed of the displayed power of the energy storage battery, Isamp is the operating current, and the Irated value is equal to the rated capacity of the energy storage battery. That is, the maximum and minimum values ​​of the product of the compensation coefficient and the compensation current can be limited according to the rated capacity, operating current, and coefficients k1 and k2 of the energy storage battery, so as to avoid the compensation speed being too fast or too slow, that is, to avoid the speed of displaying power correction being too fast or too slow, and thus to ensure the smoothness of the correction process of displaying power.

[0087] Furthermore, when no voltage jump occurs in the energy storage battery and the difference between the first real remaining power and the displayed power is less than or equal to the first threshold, the compensation current can be determined first based on the operating current, the first real remaining power and the displayed power; and then the target displayed power can be determined based on the time interval between the current moment and the previous moment, the compensation coefficient and the compensation current.

[0088] Exemplarily, taking the energy storage battery in the charging operation process as an example, first, the compensation current can be determined according to the preset formula: Icomp = max[(1+n)×Isamp, 2×Isamp], where Icomp is the compensation current, Isamp is the operating current, n = [|SOCreal(k)-SOCdisp(k)|÷ΔSOCthod], SOCreal(k) is the remaining power of the energy storage battery at the previous moment, SOCdisp(k) is the displayed power, and ΔSOCthod = 100%-SOCreal. That is, the compensation current Icomp is the larger one of (1+n)×Isamp and 2×Isamp. That is, the value of the compensation current Icomp is greater than the current operating current; wherein, n can be calculated using the following formula, n = [|SOCreal(k)-SOCdisp(k)|÷ΔSOCthod], SOCreal(k) is the remaining power of the energy storage battery at the previous moment, SOCdisp(k) is the displayed power, ΔSOCthod = 100%-SOCreal, SOCreal is the actual remaining power at the current moment.

[0089] Furthermore, the target displayed power is determined according to the time interval between the current moment and the previous moment, the compensation coefficient and the compensation current; specifically, the corrected target displayed power can be determined according to the preset formula SOCdisp(k+1)=SOCdisp(k)+η×Icomp×Δt÷Qmax. Among them, SOCdisp(k+1) is the target displayed power, and SOCdisp(k) is the displayed power. η is the coulomb efficiency, and its value range can be between 0.99 and 1, that is, it satisfies 0.99<η<1. Gain is the compensation coefficient, and Icomp is the compensation current.

[0090] Finally, after the target displayed power is determined, the current displayed power can be corrected to the target displayed power, thereby completing the displayed power correction process.

[0091] like Figure 5 As shown, an embodiment of the present application provides a method for correcting an energy storage battery, comprising:

[0092] Step 502, obtaining the operating voltage of the energy storage battery and the second maximum cell voltage;

[0093] Step 504, determining a voltage jump detection condition of the energy storage battery according to the operating voltage and the second maximum battery cell voltage;

[0094] Step 506, when the voltage jump detection condition is met, during the operation of the energy storage battery, a plurality of first maximum cell voltages of the energy storage battery are obtained according to a preset time interval;

[0095] Step 508, determining a voltage transition state of the energy storage battery according to the plurality of first maximum battery cell voltages;

[0096] Step 510, obtaining a current first real remaining power of the energy storage battery;

[0097] Step 512, when a voltage jump occurs in the energy storage battery and the difference between the first real remaining power and the displayed power is greater than a first threshold, correct the displayed power according to the first real remaining power and the first correction strategy;

[0098] Step 514, when there is no voltage jump in the energy storage battery and the difference between the first real remaining power and the displayed power is less than or equal to the first threshold, the displayed power is corrected according to the first real remaining power and the second correction strategy.

[0099] In this embodiment, before obtaining multiple first maximum cell voltages of the energy storage battery according to a preset time interval, it is first necessary to determine whether the energy storage battery meets the voltage jump detection condition, that is, to determine whether it is necessary to detect the voltage jump phenomenon during the current operation of the energy storage battery. If it is necessary to detect the voltage jump phenomenon, it is possible to obtain multiple first maximum cell voltages of the energy storage battery according to the preset time interval; and then determine whether the energy storage battery has a voltage jump based on the multiple first maximum cell voltages, and further adopt different correction strategies to correct the displayed power according to whether the energy storage battery has a voltage jump.

[0100] Specifically, the operating voltage and the second maximum cell voltage of the energy storage battery are obtained; then, according to the operating voltage and the second maximum cell voltage, the voltage jump detection condition of the energy storage battery is determined. Exemplarily, during the charging process, if the second maximum cell voltage is greater than the operating voltage, it can be determined that the energy storage battery at the current moment meets the jump detection condition, and it is necessary to detect whether the energy storage battery has a voltage jump phenomenon. On the contrary, during the discharging process, if the second maximum cell voltage is less than the operating voltage, it can be determined that the energy storage battery at the current moment meets the jump detection condition, and it is necessary to detect whether the energy storage battery has a voltage jump phenomenon.

[0101] Furthermore, when the energy storage battery does not meet the jump detection conditions at the current moment, it is also possible to judge whether the energy storage battery meets other correction conditions. For example, it is possible to judge whether the energy storage battery meets the full charge and discharge correction conditions, that is, to determine whether the actual remaining power of the current energy storage battery has reached full charge or full discharge. If it reaches full charge, the displayed power can be corrected to 100%, and if it reaches full discharge, the displayed power can be corrected to 0%. Alternatively, it is possible to judge whether the energy storage battery meets the open circuit voltage (OCV) correction strategy. If so, the displayed voltage can be corrected by directly checking the OCV table. Alternatively, it is possible to judge whether the energy storage battery meets the dynamic voltage calibration method correction conditions. If so, the displayed voltage can be corrected directly by checking the charge and discharge dynamic voltage table.

[0102] like Figure 6 As shown, an embodiment of the present application provides a method for correcting an energy storage battery, comprising:

[0103] Step 602, obtaining the second real remaining power of the energy storage battery and the current displayed power of the energy storage battery;

[0104] Step 604, determining a voltage jump detection condition of the energy storage battery according to the second real remaining power and the current displayed power of the energy storage battery;

[0105] Step 606, when the voltage jump detection condition is met, obtaining a plurality of first maximum cell voltages of the energy storage battery according to a preset time interval;

[0106] Step 608, determining a voltage transition state of the energy storage battery according to the multiple first maximum battery cell voltages;

[0107] Step 610, obtaining a current first real remaining power of the energy storage battery;

[0108] Step 612, when a voltage jump occurs in the energy storage battery and the difference between the first real remaining power and the displayed power is greater than a first threshold, correct the displayed power according to the first real remaining power and the first correction strategy;

[0109] Step 614, when there is no voltage jump in the energy storage battery and the difference between the first real remaining power and the displayed power is less than or equal to the first threshold, the displayed power is corrected according to the first real remaining power and the second correction strategy.

[0110] In this embodiment, before obtaining multiple first maximum cell voltages of the energy storage battery according to a preset time interval, it is first necessary to determine whether the energy storage battery meets the voltage jump detection condition, that is, to determine whether it is necessary to detect the voltage jump phenomenon during the current operation of the energy storage battery. If it is necessary to detect the voltage jump phenomenon, it is possible to obtain multiple first maximum cell voltages of the energy storage battery according to the preset time interval; and then determine whether the energy storage battery has a voltage jump based on the multiple first maximum cell voltages, and further adopt different correction strategies to correct the displayed power according to whether the energy storage battery has a voltage jump.

[0111] Specifically, the second real remaining power of the energy storage battery at the current moment and the current displayed power of the energy storage battery are obtained; then, according to the second real remaining power and the current displayed power of the energy storage battery, the voltage jump detection condition of the energy storage battery is determined. Exemplarily, during the charging process, if the second real remaining power is greater than the current displayed power of the energy storage battery, it can be determined that the energy storage battery at the current moment meets the jump detection condition, and it is necessary to detect whether the energy storage battery has a voltage jump phenomenon. On the contrary, during the discharging process, if the second real remaining power is less than the current displayed power of the energy storage battery, it can be determined that the energy storage battery at the current moment meets the jump detection condition, and it is necessary to detect whether the energy storage battery has a voltage jump phenomenon.

[0112] In some embodiments, optionally, Figure 7 As shown, a correction device 700 for an energy storage battery is provided, which is used to correct the displayed power of the energy storage battery. The correction device 700 for the energy storage battery includes:

[0113] The acquisition unit 702 is used to acquire a plurality of first maximum cell voltages of the energy storage battery according to a preset time interval during the operation of the energy storage battery;

[0114] A determination unit 704, configured to determine a voltage transition state of the energy storage battery according to a plurality of first maximum battery cell voltages;

[0115] The acquisition unit 702 is also used to acquire the current first real remaining power of the energy storage battery;

[0116] The correction unit 706 is used to correct the displayed power according to the first real remaining power and the first correction strategy when a voltage jump occurs in the energy storage battery and the difference between the first real remaining power and the displayed power is greater than a first threshold;

[0117] The correction unit 706 is further configured to correct the displayed power according to the first real remaining power and the second correction strategy when no voltage jump occurs in the energy storage battery and the difference between the first real remaining power and the displayed power is less than or equal to the first threshold;

[0118] The correction speed of the displayed power under the first correction strategy is higher than the correction speed of the displayed power under the second correction strategy.

[0119] The correction device 700 of the energy storage battery provided in the present application first obtains multiple first maximum cell voltages of the energy storage battery according to a preset time interval before correcting the displayed power of the energy storage battery, and then determines whether the energy storage battery has a voltage jump phenomenon according to the first maximum cell voltages, and then uses the first correction strategy or the second correction strategy to correct the displayed voltage according to whether the energy storage battery has a voltage jump phenomenon. That is, when the energy storage battery has a voltage jump phenomenon, the first correction strategy with a faster speed is used for correction, which can ensure the correction speed and accuracy of the remaining power, so that the displayed voltage can be corrected in a timely and accurate manner to ensure the accuracy of the displayed voltage. When the energy storage battery does not have a voltage jump phenomenon, the second correction strategy can be used to ensure the accuracy of the correction of the displayed power.

[0120] Further, the determination unit 704 is specifically used to: determine the voltage difference between two adjacent first maximum battery cell voltages based on multiple first maximum battery cell voltages; determine the transition coefficient based on multiple voltage differences and a preset time interval; determine a first transition coefficient greater than or equal to a second threshold value from among the multiple transition coefficients; and determine that a voltage transition occurs in the energy storage battery when the number of consecutive occurrences of the first transition coefficient is greater than or equal to a third threshold value.

[0121] Furthermore, the determination unit 704 is specifically configured to determine the transition coefficient according to a preset formula K=Δt1 / ΔV1, wherein K is the transition coefficient, Δt1 is a preset time interval, and ΔV1 is a voltage difference.

[0122] Furthermore, the acquisition unit 702 is specifically used to: acquire the operating current of the energy storage battery at the current moment; determine the first real remaining power according to the preset formula: SOCreal(k+1)=SOCreal(k)+η×Isamp×Δt÷Qmax; wherein, SOCreal(k+1) is the first real remaining power, SOCreal(k) is the remaining power of the energy storage battery at the previous moment, η is the coulomb efficiency, Isamp is the operating current, Δt is the time interval between the current moment and the previous moment, and Qmax is the maximum capacity of the energy storage battery.

[0123] Further, when a voltage jump occurs in the energy storage battery and the difference between the first real remaining power and the displayed power is greater than a first threshold value, the correction unit 706 is specifically used to: obtain multiple voltage correction points during the operation of the energy storage battery; determine the compensation coefficient according to the number of voltage correction points passed during the operation of the energy storage battery; determine the compensation current according to the operating current, the first real remaining power and the displayed power; determine the target displayed power according to the time interval between the current moment and the previous moment, the compensation coefficient and the compensation current; and correct the displayed power to the target displayed power.

[0124] Furthermore, when no voltage jump occurs in the energy storage battery and the difference between the first real remaining power and the displayed power is less than or equal to the first threshold, the correction unit 706 is specifically used to: determine the compensation current based on the operating current, the first real remaining power and the displayed power; determine the target displayed power based on the time interval between the current moment and the previous moment, the compensation coefficient and the compensation current; and correct the displayed power to the target displayed power.

[0125] Furthermore, the acquisition unit 702 is also used to: acquire the operating voltage and the second maximum cell voltage of the energy storage battery; the determination unit 704 is also used to: determine the voltage transition detection condition of the energy storage battery according to the operating voltage and the second maximum cell voltage; when the voltage transition detection condition is met, determine the voltage transition state of the energy storage battery according to multiple first maximum cell voltages.

[0126] Furthermore, the acquisition unit 702 is also used to: acquire the second current real remaining power of the energy storage battery and the current displayed power of the energy storage battery; the determination unit 704 is also used to: determine the voltage transition detection condition of the energy storage battery according to the second real remaining power and the current displayed power of the energy storage battery; when the voltage transition detection condition is met, determine the voltage transition state of the energy storage battery according to multiple first maximum battery cell voltages.

[0127] In some embodiments, optionally, Figure 8 As shown, an energy storage system 800 is provided, including: an inverter 802 for converting direct current to alternating current, or converting alternating current to direct current; an energy storage battery 804 connected to the inverter 802, and the energy storage battery 804 includes the energy storage battery correction device 700 as the above technical solution.

[0128] The energy storage system 800 provided in the present application includes an inverter 802 and an energy storage battery 804. Since the energy storage battery 804 includes the energy storage battery correction device 700 as in the above-mentioned technical solution, the energy storage system 800 has all the beneficial effects of the energy storage battery correction device 700 in any of the above-mentioned technical solutions, which will not be repeated here.

[0129] In some embodiments, the energy storage system 800 is a household energy storage system, or a balcony photovoltaic energy storage system. Among them, the household energy storage system is usually relatively large, and its position after installation is relatively fixed and cannot be moved. The power capacity is relatively large, and the power provided is relatively large, which can meet the simultaneous use of most household electrical appliances; while the balcony photovoltaic energy storage system is relatively small and easy to carry and move. It can be moved according to the user's power demand, such as from the balcony to the garage or even outdoors, etc. The power capacity is relatively small, and the power provided is also relatively small, which can be used by some household electrical appliances.

[0130] In some embodiments, optionally, a readable storage medium is provided on which a program is stored. When the program is executed by a processor, the correction method of the energy storage battery in any of the above embodiments is implemented, thereby having all the beneficial technical effects of the correction method of the energy storage battery in any of the above embodiments.

[0131] The readable storage medium includes a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0132] It should be clarified that in the claims, specification and drawings of the present application, the term "multiple" refers to two or more than two. Unless otherwise clearly defined, the orientation or position relationship indicated by the terms "upper" and "lower" is based on the orientation or position relationship shown in the drawings, which is only for the purpose of more conveniently describing the present application and making the description process easier, rather than indicating or implying that the device or element referred to must have the specific orientation described, be constructed and operated in a specific orientation, so these descriptions cannot be understood as limitations on the present application; the terms "connect", "install", "fix" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection between multiple objects, or a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects, or an indirect connection between multiple objects through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood based on the specific circumstances of the above data.

[0133] In the claims, specification and drawings of the present application, the description of the terms "one embodiment", "some embodiments", "specific embodiments" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the claims, specification and drawings of the present application, the schematic representations of the above terms do 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.

[0134] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A correction method for an energy storage battery, used for correcting the displayed power of the energy storage battery, characterized in that: The correction method of the energy storage battery comprises: During the operation of the energy storage battery, obtaining a plurality of first maximum cell voltages of the energy storage battery according to preset time intervals; Determining a voltage transition state of the energy storage battery according to the plurality of first maximum battery cell voltages; Obtaining a current first real remaining power of the energy storage battery; When a voltage jump occurs in the energy storage battery and the difference between the first real remaining power and the displayed power is greater than a first threshold, the displayed power is corrected according to the first real remaining power and a first correction strategy; When the energy storage battery does not experience a voltage jump and the difference between the first real remaining power and the displayed power is less than or equal to a first threshold, correcting the displayed power according to the first real remaining power and a second correction strategy; Among them, the correction speed of the displayed power under the first correction strategy is higher than the correction speed of the displayed power under the second correction strategy.

2. The method for correcting an energy storage battery according to claim 1, characterized in that: The step of determining the voltage transition state of the energy storage battery according to the plurality of first maximum battery cell voltages includes: Determine a voltage difference between two adjacent first maximum battery cell voltages according to the plurality of first maximum battery cell voltages; Determining a transition coefficient according to the plurality of voltage difference values ​​and the preset time interval; Determine a first transition coefficient greater than or equal to a second threshold value among the plurality of transition coefficients; When the number of consecutive occurrences of the first transition coefficient is greater than or equal to a third threshold, it is determined that a voltage transition occurs in the energy storage battery.

3. The method for correcting an energy storage battery according to claim 2, characterized in that: The step of determining the transition coefficient according to the plurality of voltage differences and the preset time interval comprises: Determine the transition coefficient according to a preset formula K=Δt1 / ΔV1; Wherein, K is the transition coefficient, Δt1 is the preset time interval, and ΔV1 is the voltage difference.

4. The method for correcting an energy storage battery according to any one of claims 1 to 3, characterized in that: The obtaining of the first real remaining power of the energy storage battery includes: Obtaining the operating current of the energy storage battery at the current moment; Determine the first real remaining power according to a preset formula: SOCreal(k+1)=SOCreal(k)+η×Isamp×Δt÷Qmax; Among them, SOCreal(k+1) is the first real remaining power, SOCreal(k) is the remaining power of the energy storage battery at the previous moment, η is the coulomb efficiency, Isamp is the operating current, Δt is the time interval between the current moment and the previous moment, and Qmax is the maximum capacity of the energy storage battery.

5. The method for correcting an energy storage battery according to claim 4, characterized in that: When a voltage jump occurs in the energy storage battery and a difference between the first real remaining power and the displayed power is greater than a first threshold, correcting the displayed power according to the first real remaining power and a first correction strategy includes: Acquire multiple voltage correction points during the operation of the energy storage battery; Determining a compensation coefficient according to the number of voltage correction points passed during the operation of the energy storage battery; determining a compensation current according to the operating current, the first real remaining power and the displayed power; Determine a target display power according to the time interval between the current moment and the previous moment, the compensation coefficient and the compensation current; The displayed power is corrected to the target displayed power.

6. The method for correcting an energy storage battery according to claim 4, characterized in that: The method of correcting the displayed power according to the first real remaining power and the second correction strategy when the energy storage battery does not experience a voltage jump and the difference between the first real remaining power and the displayed power is less than or equal to a first threshold value includes: determining a compensation current according to the operating current, the first real remaining power and the displayed power; Determine a target display power according to the time interval between the current moment and the previous moment and the compensation current; The displayed power is corrected to the target displayed power.

7. The method for correcting an energy storage battery according to any one of claims 1 to 3, characterized in that: During the operation of the energy storage battery, before obtaining a plurality of first maximum cell voltages of the energy storage battery according to a preset time interval, the correction method of the energy storage battery further includes: Obtaining the operating voltage of the energy storage battery and the second maximum cell voltage; Determining a voltage jump detection condition of the energy storage battery according to the operating voltage and the second maximum battery cell voltage; When the voltage transition detection condition is met, the voltage transition state of the energy storage battery is determined according to the plurality of first maximum battery cell voltages.

8. The method for correcting an energy storage battery according to any one of claims 1 to 3, characterized in that: During the operation of the energy storage battery, before obtaining a plurality of first maximum cell voltages of the energy storage battery according to a preset time interval, the correction method of the energy storage battery further includes: Obtaining a second current real remaining power of the energy storage battery and a current displayed power of the energy storage battery; Determining a voltage jump detection condition of the energy storage battery according to the second real remaining power and the current displayed power of the energy storage battery; When the voltage transition detection condition is met, the voltage transition state of the energy storage battery is determined according to the plurality of first maximum battery cell voltages.

9. A correction device for an energy storage battery, used for correcting the displayed power of the energy storage battery, characterized in that: The correction device of the energy storage battery comprises: an acquisition unit, configured to acquire a plurality of first maximum cell voltages of the energy storage battery according to preset time intervals during the operation of the energy storage battery; a determining unit, configured to determine a voltage transition state of the energy storage battery according to a plurality of the first maximum battery cell voltages; The acquisition unit is also used to acquire a current first real remaining power of the energy storage battery; a correction unit, configured to correct the displayed power according to the first real remaining power and a first correction strategy when a voltage jump occurs in the energy storage battery and a difference between the first real remaining power and the displayed power is greater than a first threshold; and When the energy storage battery does not experience a voltage jump and the difference between the first real remaining power and the displayed power is less than or equal to a first threshold, correcting the displayed power according to the first real remaining power and a second correction strategy; Among them, the correction speed of the displayed power under the first correction strategy is higher than the correction speed of the displayed power under the second correction strategy.

10. An energy storage system, characterized in that: include: Inverters, which convert DC to AC or vice versa; An energy storage battery is connected to the inverter, and the energy storage battery includes the correction device for the energy storage battery as claimed in claim 9.

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