Multi - battery balancing control management method, battery management system and device

Abstract

This application relates to the technical field of battery management, and provides a multi-battery balancing control management method, a battery management system, and a device. The multi-battery balancing control management method includes: determining target batteries from each energy storage battery based on the power supply demand corresponding to the power supply instruction; when at least two of the determined target batteries are included, obtaining the state parameters of each target battery; for each target battery, determining the energy storage index corresponding to the target battery based on the state parameters corresponding to the target battery; decomposing the power supply demand based on the energy storage indexes corresponding to each target battery to obtain the power supply parameters corresponding to each target battery; for each target battery, controlling the target battery to supply power based on the power supply parameters corresponding to the target battery. In the above technical solution, the working state of the target battery can be reasonably determined in combination with the actual situation of different target batteries, so that the balance of different target batteries can be achieved while ensuring that the power supply demand is met.

Description

Technical Field

[0001] This application relates to the technical field of battery management, and in particular to a multi-battery equalization control management method, a battery management system and a device. Background Art

[0002] In the case of multiple energy storage batteries connected in parallel for power supply, it is crucial to ensure the consistency of the states of the energy storage batteries and the stability of the power output, which directly affects the reliability and efficiency of the system.

[0003] In related technologies, a fixed power distribution strategy or a simple voltage feedback mechanism is usually adopted to coordinate the outputs of different energy storage batteries.

[0004] However, although the methods in related technologies can control the output of the energy storage batteries to a certain extent, it is difficult to effectively cope with the problem of imbalance in the states of the energy storage batteries in the battery pack, so improvement is needed. Summary of the Invention

[0005] To help achieve the state balance of different energy storage batteries, this application provides a multi-battery equalization control management method, a battery management system and a device.

[0006] In a first aspect, this application provides a multi-battery equalization control management method, adopting the following technical solution:

[0007] A multi-battery equalization control management method is used in a controller of a battery management system. The battery management system further includes at least two energy storage batteries connected to the controller. The method includes:

[0008] In response to a power supply instruction, determine the power supply demand corresponding to the power supply instruction;

[0009] Based on the power supply demand, determine target batteries from each of the energy storage batteries;

[0010] In the case where the determined target batteries include at least two, obtain the state parameters of each of the target batteries;

[0011] For each of the target batteries, determine the energy storage index corresponding to the target battery based on the state parameter corresponding to the target battery;

[0012] Decompose the power supply demand based on the energy storage indexes corresponding to each of the target batteries to obtain the power supply parameters corresponding to each of the target batteries;

[0013] For each of the target batteries, control the target battery to supply power based on the power supply parameter corresponding to the target battery.

[0014] By adopting the above technical solution, when a power supply instruction is received, a target battery can be selected from each energy storage battery, and the power supply demand indicated by the power supply instruction can be decomposed based on the energy storage index corresponding to the target battery to obtain the power supply parameters corresponding to each target battery, and the corresponding target battery can be controlled to supply power based on the power supply parameters. In this way, the working state of the target battery can be reasonably determined in combination with the actual situation of different target batteries, so as to achieve the balance of different target batteries while ensuring that the power supply demand is met.

[0015] Optionally, the determining the energy storage index corresponding to the target battery based on the state parameter corresponding to the target battery includes:

[0016] Estimate the state of charge of the target battery based on the state parameter using a preset initial estimation method to obtain an estimated state of charge;

[0017] Determine whether to verify the estimated state of charge based on the estimated state of charge and the historical state of charge corresponding to the target battery, where the historical state of charge is the state of charge determined historically;

[0018] In the case where it is determined not to verify the estimated state of charge, determine the energy storage index corresponding to the target battery based on the estimated state of charge.

[0019] By adopting the above technical solution, the estimated state of charge can be verified in combination with the historical state of charge, which can help improve the accuracy of the finally determined energy storage index.

[0020] Optionally, after determining whether to verify the estimated state of charge based on the estimated state of charge and the historical state of charge corresponding to the target battery, it further includes:

[0021] In the case where it is determined to verify the estimated state of charge, select a target verification method from at least one preset verification method based on the estimated state of charge;

[0022] Use the target verification method to estimate the state of charge of the target battery based on the state parameter to obtain a verified state of charge;

[0023] Determine the energy storage index corresponding to the target battery based on the verified state of charge.

[0024] By adopting the above technical solution, a target verification method can be selected from at least one preset verification method based on the estimated state of charge, which can help improve the matching degree between the verification method and the state of charge of the target battery, thus helping to improve the accuracy of the determined verified state of charge, and further helping to improve the accuracy of the finally determined energy storage index.

[0025] Optionally, determining whether to verify the estimated state of charge based on the estimated state of charge and the historical state of charge corresponding to the target battery includes:

[0026] Determining whether the difference between the estimated state of charge and the historical state of charge is greater than a preset difference value threshold;

[0027] When the difference between the estimated state of charge and the historical state of charge is not greater than the difference value threshold, it is determined that there is no need to verify the estimated state of charge;

[0028] When the difference between the estimated state of charge and the historical state of charge is greater than the difference value threshold, obtain the historical discharge data corresponding to the target battery, where the historical discharge data is collected after the historical state of charge is determined;

[0029] Predict the current state of charge based on the historical state of charge and the historical discharge data;

[0030] Determine whether to verify the estimated state of charge based on the estimated state of charge and the current state of charge.

[0031] By adopting the above technical solution, it is possible to determine whether to verify the estimated state of charge in combination with the historical state of charge, which can help avoid the influence of the accuracy of the historical discharge data on the verification judgment result, and thus can help improve the accuracy of the verification judgment result.

[0032] Optionally, determining the energy storage index corresponding to the target battery based on the verified state of charge includes:

[0033] When it is determined to verify the estimated state of charge based on the verified state of charge and the current state of charge, determine whether the current state of charge matches the verified state of charge;

[0034] When it is determined that the verified state of charge does not match the current state of charge, correct the verified state of charge based on the current state of charge to obtain the corrected state of charge;

[0035] Determine the energy storage index corresponding to the target battery based on the corrected state of charge.

[0036] By adopting the above technical solution, it is possible to correct the verified state of charge in combination with the current state of charge, which can help reduce the influence of the error in the process of determining the verified state of charge on the energy storage index, and thus can help improve the accuracy of the determined energy storage index.

[0037] Optionally, determining the energy storage index corresponding to the target battery based on the state parameters corresponding to the target battery includes:

[0038] Determining the state of charge of the target battery based on the state parameters;

[0039] Determining the energy storage level interval corresponding to the target battery based on the state of charge;

[0040] Determining the energy storage index corresponding to the target battery based on the level parameters corresponding to the energy storage level interval, where the level parameters corresponding to different energy storage level intervals are different.

[0041] By adopting the above technical solution, the energy storage index corresponding to the target battery can be determined based on the level parameters of the energy storage level interval corresponding to the state of charge. In this way, the energy storage index can be determined in combination with the actual situation of the state of charge, which can help improve the accuracy of the determined energy storage index.

[0042] Optionally, decomposing the power supply demand based on the energy storage indexes corresponding to the target batteries to obtain the power supply parameters corresponding to the target batteries includes:

[0043] Determining the power supply ratio of each target battery based on the energy storage index corresponding to each target battery;

[0044] Decomposing the power supply demand based on the power supply ratio corresponding to each target battery to obtain the power supply parameters corresponding to the target batteries.

[0045] Optionally, controlling the target battery to supply power based on the power supply parameter corresponding to the target battery further includes:

[0046] Obtaining the actual power supply data of the target battery;

[0047] Determining whether the actual power supply data matches the power supply parameter;

[0048] In the case where the actual power supply data does not match the power supply parameter, determining whether there is a candidate battery among the energy storage batteries that have not been determined as the target battery and whose state parameters match those of the target battery;

[0049] In the case where there is a candidate battery whose state parameters match those of the target battery, controlling the candidate battery to supply power based on the power supply parameter corresponding to the target battery.

[0050] By adopting the above technical solution, the power supply process of the target battery can be monitored in combination with the actual power supply data, and when it is determined that the actual power supply data does not match the power supply parameters, a backup battery that matches the state parameters of the target battery can be determined in a timely manner. In this way, it can help reduce the impact of the abnormality of the target battery on the power supply process, and further help ensure the stability of the overall power supply.

[0051] In a second aspect, the present application provides a battery management system, adopting the following technical solution:

[0052] A battery management system, the battery management system includes at least two energy storage batteries, a controller and a power transmission module connected to each of the energy storage batteries;

[0053] The energy storage battery is used to store electric energy and supply power externally or charge internally through the power transmission module under the control of the controller;

[0054] The controller is configured to execute any one of the multi-battery equalization control management methods provided in the first aspect.

[0055] In a third aspect, the present application provides an electronic device, adopting the following technical solution:

[0056] An electronic device, the electronic device includes:

[0057] At least one processor;

[0058] A memory;

[0059] At least one application program, wherein at least one application program is stored in the memory and configured to be executed by at least one processor, and the at least one application program is configured to: execute any one of the multi-battery equalization control management methods provided in the first aspect.

[0060] In summary, the present application includes at least one of the following beneficial technical effects:

[0061] 1. The working state of the target battery can be reasonably determined in combination with the actual situation of different target batteries, so that the balance of different target batteries can be achieved while ensuring the satisfaction of the power supply demand.

[0062] 2. The estimated state of charge can be verified in combination with the historical state of charge, which can help improve the accuracy of the finally determined energy storage index. Description of the Drawings

[0063] Figure 1 It is a schematic flowchart of a multi-battery equalization management method provided by an embodiment of the present application;

[0064] Figure 2It is a schematic flowchart of a method for determining energy storage indicators provided by an embodiment of the present application;

[0065] Figure 3 It is a schematic flowchart of a method for verifying and judging the estimated state of charge provided by an embodiment of the present application;

[0066] Figure 4 It is a schematic flowchart of another method for determining energy storage indicators provided by an embodiment of the present application;

[0067] Figure 5 It is a schematic flowchart of a power supply control method provided by an embodiment of the present application;

[0068] Figure 6 It is a schematic structural diagram of a battery management system provided by an embodiment of the present application;

[0069] Figure 7 It is a schematic structural diagram of an electronic device provided by an embodiment of the present application. Detailed implementation manners

[0070] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the following further describes the present application in detail with reference to the appended Figures 1-7 drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0071] An embodiment of the present application discloses a multi-battery balanced control and management method, which is used in a controller of a battery management system. The battery management system further includes at least two energy storage batteries that are signal-connected to the controller. The at least two energy storage batteries are connected in parallel and can supply power externally alone or in cooperation. In actual implementation, the battery management system can be embedded in an energy storage system, a charging station, a battery pack, as long as it can be realized.

[0072] Referring to Figure 1 , the multi-battery balanced control and management method includes the following steps:

[0073] Step 101, in response to a power supply instruction, determine the power supply demand corresponding to the power supply instruction.

[0074] Specifically, the power supply instruction is used to indicate power supply through the energy storage battery, and the power supply demand is included in the power supply instruction and may include at least one piece of power supply-related data such as power supply power, power supply current, power supply voltage, and power supply protocol. Further, the power supply demand may further include the required power supply amount, so as to assist in judging the number of energy storage batteries to be enabled.

[0075] In one example, the power supply instruction is sent by another system or device to the battery management system. For example, it is sent by the charging management system to the battery management system. Correspondingly, the charging management system and the battery management system perform data interaction through a reserved data interface.

[0076] In another example, the power supply instruction is generated by the battery management system. At this time, the battery management system provides a user interaction component and can receive the user's operation based on the user interaction component, and then generate a corresponding power supply instruction based on the user's operation. In actual implementation, the user interaction component can be implemented as a touch screen.

[0077] Step 102: Determine the target battery from each energy storage battery based on the power supply demand.

[0078] Specifically, since the number of energy storage batteries is more than two, in the actual power supply process, some or all of the energy storage batteries can be selected for power supply according to the actual situation to ensure the power supply efficiency. Therefore, it is necessary to determine the target battery for this power supply from each energy storage battery.

[0079] In actual implementation, the target battery can be determined based on at least one of factors such as the required current, required voltage, and required power supply amount in the power supply demand.

[0080] In one example, the number of energy storage batteries to be started for this demand can be determined in combination with the required current. Further, the target energy storage battery can be selected in combination with the current magnitude that different energy storage batteries can provide in the current state.

[0081] In another example, the number of energy storage batteries to be started for this demand can be determined in combination with the required power supply amount. Further, the target energy storage battery can be selected in combination with the remaining power or the maximum power storage capacity of different energy storage batteries.

[0082] Step 103: When the determined target batteries include at least two, obtain the state parameters of each target battery.

[0083] Among them, the state parameters are used to reflect the state of the battery, and the state parameters are obtained and recorded by the controller based on the connection with the energy storage battery. Specifically, the state parameters can include at least one of parameters that can reflect the battery state, such as open circuit voltage (OCV), charge and discharge current, internal resistance, and temperature.

[0084] Specifically, when the determined target batteries include at least two, it means that multiple target batteries need to be controlled to supply power simultaneously. Since the states of different target batteries may be different, and the differences in battery states will affect the discharge process, it is necessary to determine the state parameters of the target batteries to understand the states of the target batteries.

[0085] Step 104. For each target battery, determine the energy storage index corresponding to the target battery based on the state parameters corresponding to the target battery.

[0086] The energy storage index is used to indicate the state of the battery. Specifically, the energy storage index is determined based on the state parameters, and the method for determining the energy storage index based on the state parameters is preset.

[0087] In one example, the energy storage index includes the state of charge (SOC). Since the state of charge can reflect the remaining capacity of the battery (generally expressed as a percentage), and the remaining capacity of the battery has a great impact on the state of the battery and the power transmission process, it is necessary to determine the state of charge as the energy storage index to be considered in the process of decomposing the power supply demand, which can help to achieve the state balance of each energy storage battery.

[0088] Specifically, the state of charge can be calculated by the open circuit voltage method (OVC), neural network method, etc. This embodiment does not limit the calculation method of the state of charge.

[0089] In actual implementation, the energy storage index can also include the state of health (SOH), maximum power supply (SOP), etc. In this way, the energy storage index can more accurately reflect the state of the battery.

[0090] In some embodiments, determining the energy storage index corresponding to the target battery based on the state parameters corresponding to the target battery includes: determining the state of charge of the target battery based on the state parameters; determining the energy storage level interval corresponding to the target battery based on the state of charge; determining the energy storage index corresponding to the target battery based on the level parameters corresponding to the energy storage level interval, and the level parameters corresponding to different energy storage level intervals are different.

[0091] The energy storage level interval is obtained by dividing the value range of the state of charge, and the level parameters corresponding to different energy storage level intervals are different.

[0092] In one example, directly determine the level parameter as the energy storage index. In this way, the energy storage index can reflect the energy storage level interval to which the state of charge of the target battery belongs, so that the energy storage index can roughly reflect the state of charge of the target battery, reduce the influence of the state of charge calculation error on the determination of the energy storage index, and thus help to improve the accuracy of the determined energy storage index.

[0093] In another example, determining the energy storage index corresponding to the target battery based on the level parameter corresponding to the energy storage level interval includes: determining the product of the level parameter and the state of charge as the energy storage index. Specifically, during the research process, it was found that due to the accuracy error in the calculation process of the state of charge, and the accuracy corresponding to different state of charge ranges may vary. Based on this, in this example, the energy storage level interval can be divided based on the distribution of the accuracy of the state of charge, and the level parameter corresponding to the energy storage level interval can be determined based on the accuracy of the state of charge corresponding to the energy storage level interval, so as to compensate for the accuracy of the determined state of charge through the level parameter, and further help improve the accuracy of the energy storage index.

[0094] Step 105, decompose the power supply demand based on the energy storage index corresponding to each target battery to obtain the power supply parameters corresponding to each target battery.

[0095] Among them, the power supply parameter is used to indicate the way of supplying power to the battery pack. Specifically, the power supply parameter can include at least one of the parameters related to power supply such as supply current, supply voltage, and supply power.

[0096] In the above technical solution, since the power supply demand can be decomposed in combination with the energy storage index, the working state of the target battery can be reasonably determined in combination with the actual situation of different target batteries, so that the balance of different target batteries can be achieved while ensuring that the power supply demand is met.

[0097] Optionally, decomposing the power supply demand based on the energy storage index corresponding to each target battery to obtain the power supply parameters corresponding to each target battery includes: determining the power supply ratio corresponding to each target battery based on the energy storage index corresponding to each target battery; decomposing the power supply demand based on the power supply ratio corresponding to each target battery to obtain the power supply parameters corresponding to each target battery.

[0098] In an example, taking the energy storage index including the state of charge, the power supply demand including the demand current, and the power supply parameter including the supply current as an example for illustration. At this time, decomposing the power supply demand based on the energy storage index corresponding to each target battery to obtain the power supply parameters corresponding to each target battery includes: determining the power supply ratio corresponding to each target battery based on the state of charge corresponding to each target battery; decomposing the demand current based on the power supply ratio corresponding to each target battery to obtain the supply current corresponding to each target battery.

[0099] Among them, the greater the state of charge, the greater the power supply weight. Correspondingly, the greater the power supply weight, the greater the corresponding supply current.

[0100] In actual implementation, the power supply demand can also be decomposed based on other energy storage indexes to obtain the power supply parameters, and the principle is the same as that in the above example, which will not be elaborated in this embodiment.

[0101] Step 106: For each target battery, control the target battery to supply power based on the power supply parameters corresponding to the target battery.

[0102] In one example, the power supply parameters include the supply current. At this time, the target battery can be controlled to supply power with the corresponding supply current.

[0103] The implementation principle of the multi-battery equalization control management method in the embodiments of the present application is as follows: In response to a power supply instruction, determine the power supply demand corresponding to the power supply instruction; determine the target battery from each energy storage battery based on the power supply demand; in the case where at least two of the determined target batteries are included, obtain the state parameters of each target battery; for each target battery, determine the energy storage index corresponding to the target battery based on the state parameters corresponding to the target battery; decompose the power supply demand based on the energy storage indexes corresponding to each target battery to obtain the power supply parameters corresponding to each target battery; for each target battery, control the target battery to supply power based on the power supply parameters corresponding to the target battery. In the above technical solution, when receiving a power supply instruction, the target battery can be selected from each energy storage battery, and the power supply demand indicated by the power supply instruction is decomposed based on the energy storage index corresponding to the target battery to obtain the power supply parameters corresponding to each target battery, and the corresponding target battery is controlled to supply power based on the power supply parameters. In this way, the working state of the target battery can be reasonably determined in combination with the actual situation of different target batteries, so as to achieve the equalization of different target batteries while ensuring that the power supply demand is met.

[0104] In some embodiments, referring to Figure 2 , in step 104, determining the energy storage index corresponding to the target battery based on the state parameters corresponding to the target battery includes the following steps:

[0105] Step 201: Use a preset initial estimation method to estimate the state of charge of the target battery based on the state parameters to obtain an estimated state of charge.

[0106] Among them, the initial estimation method is set in advance. In one example, the initial evaluation is generally used for a rough evaluation of the state of charge. Therefore, the initial estimation method can adopt a method with a small amount of calculation and a fast calculation speed. For example, the initial estimation method is to estimate using the open circuit voltage method (OVC).

[0107] Step 202: Determine whether to verify the estimated state of charge based on the estimated state of charge and the historical state of charge corresponding to the target battery.

[0108] Among them, the historical state of charge is the state of charge determined historically, and the historical state of charge is stored in the battery management system. In one example, the historical state of charge is collected when or after the target battery's most recent discharge ends.

[0109] In one example, it is determined whether to perform verification on the estimated state of charge based on the difference between the estimated state of charge and the historical state of charge corresponding to the target battery. For example, when the difference between the estimated state of charge and the historical state of charge is greater than a preset difference value threshold, it is determined to perform verification on the estimated state of charge; when the difference between the estimated state of charge and the historical state of charge is less than or equal to the difference value threshold, it can be directly determined not to perform verification on the estimated state of charge, or it can also be determined whether to perform verification on the estimated state of charge in other ways.

[0110] Step 203, when it is determined not to perform verification on the estimated state of charge, determine the energy storage index corresponding to the target battery based on the estimated state of charge.

[0111] In the above technical solution, after estimating the state of charge of the target battery using the initial estimation method, it is combined with the historical state of charge of the target battery to determine whether to perform verification on the estimated state of charge, and when it is determined not to perform verification on the estimated state of charge, determine the energy storage index corresponding to the target battery based on the estimated state of charge. In this way, the estimated state of charge can be verified in combination with the historical state of charge, which can help improve the accuracy of the finally determined energy storage index.

[0112] Based on the above technical solution, further, continue to refer to Figure 2 , after step 202, determining whether to perform verification on the estimated state of charge based on the difference between the estimated state of charge and the historical state of charge corresponding to the target battery, it further includes:

[0113] Step 204, when it is determined to perform verification on the estimated state of charge, select a target verification method from at least one preset verification method based on the estimated state of charge.

[0114] Among them, the verification method is a method for estimating the state of charge, and the verification method is different from the initial estimation method.

[0115] Specifically, in the research process, it is found that the accuracy of state of charge prediction is related to the magnitude of the state of charge, and there may be differences in the best prediction ranges corresponding to different state of charge prediction methods. For example, a certain prediction method has higher accuracy in predicting the state of charge with a larger value, while another prediction method has higher accuracy in predicting the state of charge with a lower value.

[0116] Based on this, in order to help improve the accuracy of the verification result, in this embodiment, the target verification method is determined based on the estimated state of charge, which can improve the matching degree between the target verification method and the state of charge, and thus can help improve the accuracy of the verification result.

[0117] In one example, selecting a target verification method from at least one preset verification method based on the estimated state of charge includes: determining the target state range to which the estimated state of charge belongs from each preset state range; and determining the verification method corresponding to the target state range as the target verification method.

[0118] Among them, the state range is obtained by dividing the value range of the state of charge. For example, when the state of charge is represented by a percentage, the state range is obtained by dividing the range from 0 to 100%. Correspondingly, the verification method corresponding to the state range is preset.

[0119] In one example, the verification method includes using a pre-trained neural network model to estimate the state of charge. The input of the neural network model can include factors such as current, voltage, and temperature. In this way, the estimated state of charge can be comprehensively determined by integrating state parameters in different dimensions, which helps to improve the accuracy of the estimated state of charge.

[0120] In another example, the verification method includes the voltage-time integration method, and in this case, it is necessary to monitor the change of voltage over time. This can reduce the cumulative error in the verification process and thus help to improve the accuracy of the verification result.

[0121] Step 205, using the target verification method to estimate the state of charge of the target battery based on the state parameters to obtain the verified state of charge.

[0122] Step 206, determining the energy storage index corresponding to the target battery based on the verified state of charge.

[0123] In one example, directly determine the verified state of charge as the energy storage index.

[0124] In the above embodiments, when it is determined to verify the estimated state of charge, a target verification method can be selected from at least one preset verification method based on the estimated state of charge, and the energy storage index corresponding to the target battery can be determined based on the verified state of charge obtained by using the target verification method to estimate the state of charge of the target battery based on the state parameters. This can help to improve the matching degree between the verification method and the state of charge of the target battery, thereby helping to improve the accuracy of the determined verified state of charge, and further helping to improve the accuracy of the finally determined energy storage index.

[0125] In some embodiments, referring to Figure 3 , the above step 202, determining whether to verify the estimated state of charge based on the estimated state of charge and the historical state of charge corresponding to the target battery, includes the following steps:

[0126] Step 301, determine whether the difference between the estimated state of charge and the historical state of charge is greater than a preset difference value threshold.

[0127] In one example, the state of charge is represented by a percentage, and in this case, the difference value threshold can be 5%.

[0128] Step 302, when the difference between the estimated state of charge and the historical state of charge is not greater than the difference value threshold, determine that there is no need to verify the estimated state of charge.

[0129] Step 303, when the difference between the estimated state of charge and the historical state of charge is greater than the difference value threshold, obtain the historical discharge data corresponding to the target battery.

[0130] Among them, the historical discharge data is used to indicate the discharge situation, and the historical discharge data is collected after the historical state of charge is determined. In actual implementation, the historical discharge data may include at least one of the voltage change situation, current change situation, power supply amount, etc. that can reflect the discharge situation.

[0131] Step 304, predict the current state of charge based on the historical state of charge and the historical discharge data.

[0132] Specifically, since the historical discharge data can indicate the discharge situation of the battery after the historical state of charge, the current state of charge can be predicted through the historical state of charge and the historical discharge data.

[0133] Optionally, predicting the current state of charge based on the historical state of charge and the historical discharge data includes: determining the historical discharge amount based on the historical discharge data; adjusting the historical state of charge based on the historical discharge amount to obtain the current state of charge.

[0134] Among them, the historical discharge amount can be calculated from the historical discharge data, such as calculated based on the voltage change situation and current change situation in the historical discharge data, or it can also be directly recorded in the historical discharge data.

[0135] Step 305, determine whether to verify the estimated state of charge based on the estimated state of charge and the current state of charge.

[0136] Optionally, determining whether to verify the estimated state of charge based on the estimated state of charge and the current state of charge includes: determining whether the difference between the estimated state of charge and the current state of charge is greater than a preset difference value threshold; if so, determine to verify the estimated state of charge; if not, determine not to verify the estimated state of charge.

[0137] In the above embodiments, since it is possible to further determine the current state of charge based on historical discharge data and historical state of charge when the difference between the estimated state of charge and the historical state of charge is greater than a preset difference threshold value, and determine whether to verify the estimated state of charge based on the estimated state of charge and the current state of charge, this can help avoid the influence of the accuracy of historical discharge data on the verification judgment result, and thus can help improve the accuracy of the verification judgment result.

[0138] Further, referring to Figure 4 , step 206 above, determining the energy storage index corresponding to the target battery based on the verified state of charge includes the following steps:

[0139] Step 401, when it is determined to verify the estimated state of charge based on the estimated state of charge and the current state of charge, determine whether the verified state of charge matches the current state of charge.

[0140] Optionally, determining whether the verified state of charge matches the current state of charge includes: determining whether the difference between the verified state of charge and the current state of charge is greater than a preset difference threshold value; if so, determine that the verified state of charge does not match the current state of charge; if not, determine that the verified state of charge matches the current state of charge.

[0141] Step 402, when it is determined that the verified state of charge does not match the current state of charge, correct the verified state of charge based on the current state of charge to obtain the corrected state of charge.

[0142] Optionally, correcting the verified state of charge based on the current state of charge to obtain the corrected state of charge includes: determining the weighted average of the current state of charge and the verified state of charge as the corrected state of charge.

[0143] Among them, the weights of the current state of charge and the verified state of charge can be set in advance, or can also be set in combination with the determination method of the verified state of charge. For example: the weights of the verified state of charge determined by different verification methods are set separately. At this time, the weights can be set in combination with the accuracy of different verification methods. For example: the weight of the verified state of charge obtained by a verification method with high accuracy is large, and the weight of the verified state of charge obtained by a verification method with low accuracy is small. In this way, the determination process of the corrected state of charge can be adjusted in combination with the actual situation of the verification method, and thus can help improve the accuracy of the finally determined corrected state of charge.

[0144] Optionally, when it is determined that the verified state of charge matches the current state of charge, the verified state of charge can be directly determined as the energy storage index corresponding to the target battery.

[0145] Step 403: Determine the energy storage index corresponding to the target battery based on the corrected state of charge.

[0146] Optionally, determining the energy storage index corresponding to the target battery based on the corrected state of charge includes: determining the corrected state of charge as the energy storage index corresponding to the target battery.

[0147] In the above technical solution, since it is possible to determine the verification of the estimated state of charge based on the estimated state of charge and the current state of charge, after determining the verified state of charge, further determine whether the verified state of charge matches the current state of charge, and in the case where it is determined that the verified state of charge does not match the current state of charge, correct the verified state of charge based on the current state of charge, and determine the energy storage index corresponding to the target battery based on the corrected state of charge. In this way, it can help reduce the influence of errors in the process of determining the verified state of charge on the energy storage index, and thus can help improve the accuracy of the determined energy storage index.

[0148] In some embodiments, referring to Figure 5 , step 106 above, controlling the target battery to supply power based on the power supply parameter corresponding to the target battery includes the following steps:

[0149] Step 501: Obtain the actual power supply data of the target battery.

[0150] Among them, the actual power supply data is used to reflect the actual power supply situation of the target battery. For example: actual power supply current, actual power supply voltage, actual power supply power, etc. The type of the actual power supply parameter is the same as the type of the power supply parameter. In actual implementation, the actual power supply data can be collected by the target battery itself, or can also be collected by a monitoring component (such as: current acquisition component, voltage acquisition component, etc.) corresponding to the target battery. This embodiment does not limit the acquisition method of the actual power supply data.

[0151] Step 502: Determine whether the actual power supply data matches the power supply parameter.

[0152] Specifically, since under normal circumstances the target battery should supply power according to the power supply parameter, at this time the actual power supply data should match the power supply parameter, and in the case where the target battery is abnormal, the actual power supply data may be significantly different from the power supply parameter, and at this time the actual power supply data does not match the power supply parameter.

[0153] Optionally, it can be determined whether the actual power supply data matches the power supply parameter according to the magnitude of the gap between the actual power supply data and the power supply parameter. For example: in the case where the gap is greater than a preset gap value threshold, it is determined that the actual power supply data does not match the power supply parameter; in the case where the gap is less than or equal to the gap value threshold, it is determined that the actual power supply data matches the power supply parameter.

[0154] Step 503: When the actual power supply data does not match the power supply parameters, determine whether there is a candidate battery among the energy storage batteries that have not been determined as the target battery and whose state parameters match those of the target battery.

[0155] Among them, the matching method of state parameters between different batteries is preset. In one example, it can be determined whether the state parameters match based on the gap between the state parameters. For example, when the gap between the state parameters is less than or equal to the preset gap value threshold, it is determined that the state parameters match.

[0156] In actual implementation, when there are more than two state parameters, it can be determined whether the batteries match based on the matching relationship of at least one key parameter among the state parameters, or it can also be determined whether the batteries match based on the matching relationship of all state parameters. When matching through the gap between the state parameters, the gap value thresholds corresponding to different state parameters can be set separately in combination with the actual situation of the state parameters, which can help improve the accuracy of the matching result.

[0157] Further, when the actual power supply data does not match the power supply parameters, it also includes: outputting an abnormal prompt message corresponding to the target battery to prompt for abnormal processing of the target battery. Furthermore, the control of the target battery for power supply can be stopped to ensure the safety of the power supply process.

[0158] Step 504: When there is a candidate battery whose state parameters match those of the target battery, control the candidate battery to supply power based on the power supply parameters corresponding to the target battery.

[0159] Optionally, when there is no candidate battery whose state parameters match those of the target battery, a supplementary power supply instruction can be directly generated based on the power supply parameters corresponding to the target battery, so as to re-determine the target battery among the energy storage batteries that have not been determined as the target battery based on the supplementary power supply instruction, and determine the power supply parameters corresponding to the target battery. The specific method can be analogous to Steps 101 to 106 above and will not be elaborated here.

[0160] In the above technical solution, during the process of controlling the target battery to discharge, the working state of the target battery can be monitored based on the matching relationship between the actual power supply data and the power supply parameters. When it is determined that the actual power supply data does not match the power supply parameters, a candidate battery whose state parameters match those of the target battery can be determined in a timely manner, and the candidate battery can be controlled to supply power based on the power supply parameters corresponding to the target battery. This can help reduce the impact of the abnormality of the target battery on the power supply process, and further help ensure the stability of the overall power supply.

[0161] The embodiment of the present application also provides a battery management system. Refer to Figure 6, the battery management system includes at least two energy storage batteries 610, a controller 620 connected to each energy storage battery 610, and a power transmission module 630.

[0162] The energy storage battery 610 is used to store electric energy and supply power externally or charge internally through the power transmission module 630 under the control of the controller 620.

[0163] The controller 620 is used for the multi-battery equalization control management method provided by the above method embodiments.

[0164] An embodiment of the present application also provides an electronic device, such as Figure 7 shown. Figure 7 The electronic device 700 shown includes: a processor 701 and a memory 703. Among them, the processor 701 and the memory 703 are connected, such as connected through a bus 702. Optionally, the electronic device 700 may further include a transceiver 704. It should be noted that in actual applications, the transceiver 704 is not limited to one, and the structure of the electronic device 700 does not constitute a limitation to the embodiments of the present application.

[0165] The processor 701 may be a CPU (Central Processing Unit, central processing unit), a general-purpose processor, a DSP (Digital Signal Processor, data signal processor), an ASIC (Application Specific Integrated Circuit, application-specific integrated circuit), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute various exemplary logic blocks, modules, and circuits described in combination with the disclosure of the present application. The processor 701 may also be a combination that realizes computing functions, such as a combination including one or more microprocessors, a combination of a DSP and a microprocessor, etc.

[0166] The bus 702 may include a path for transmitting information between the above components. The bus 702 may be a PCI (Peripheral Component Interconnect, peripheral component interconnect standard) bus or an EISA (Extended Industry Standard Architecture, extended industry standard structure) bus, etc. The bus 702 may be divided into an address bus, a data bus, etc. For the sake of convenience of representation, Figure 7 only a thick line is shown in the figure, but it does not mean that there is only one bus or one type of bus.

[0167] The memory 703 can be a ROM (Read Only Memory), or other types of static storage devices that can store static information and instructions, a RAM (Random Access Memory), or other types of dynamic storage devices that can store information and instructions. It can also be an EEPROM (Electrically Erasable Programmable Read Only Memory), a magnetic disk storage medium, or other magnetic storage devices, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto.

[0168] The memory 703 is used to store the application program code for implementing the solution of this application and is controlled by the processor 701 for execution. The processor 701 is used to execute the application program code stored in the memory 703 to implement the content shown in the foregoing method embodiments.

[0169] Among them, the electronic device includes but is not limited to: mobile terminals such as mobile phones, laptop computers, PDAs (Personal Digital Assistants), PADs (Tablet Computers), etc., and fixed terminals such as digital TVs, desktop computers, etc. It can also be a server, etc. Figure 7 The illustrated electronic device is only an example and should not impose any limitations on the functions and usage scope of the embodiments of this application.

[0170] It should be understood that although the steps in the flowchart of the accompanying drawings are shown in sequence according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps has no strict order limit and can be executed in other orders.

[0171] The above is only a partial implementation manner of this application. It should be noted that for those of ordinary skill in the art, without departing from the principle of this application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of this application.

Claims

1. A multi-battery balancing control management method, characterized in that: In a controller for a battery management system, the battery management system further comprises at least two energy storage batteries connected to the controller, the method comprising: In response to the power supply instruction, determining a power supply demand corresponding to the power supply instruction; Determining a target battery from each of the energy storage batteries based on the power supply demand; When the determined target batteries include at least two, acquiring a state parameter of each of the target batteries; For each of the target batteries, determining an energy storage index corresponding to the target battery based on a state parameter corresponding to the target battery; Decomposing the power supply demand based on the energy storage index corresponding to each of the target batteries to obtain the power supply parameters corresponding to each of the target batteries; For each of the target batteries, controlling the target battery to supply power based on a power supply parameter corresponding to the target battery; The determining the energy storage index corresponding to the target battery based on the state parameter corresponding to the target battery includes: Using a preset initial estimation method to estimate the state of charge of the target battery based on the state parameter to obtain an estimated state of charge; determining whether to verify the estimated state of charge based on the estimated state of charge and a historical state of charge corresponding to the target battery, the historical state of charge being a state of charge determined historically; In the case where it is determined that the estimated state of charge is to be verified, a target state range to which the estimated state of charge belongs is determined from various preset state ranges, and a verification method corresponding to the target state range is determined as a target verification method, wherein the state range is obtained by dividing a value interval of the state of charge; Using the target verification method to estimate the state of charge of the target battery based on the state parameter to obtain a verification state of charge; An energy storage index corresponding to the target battery is determined based on the verified state of charge.

2. The method according to claim 1, characterized in that After determining whether to verify the estimated state of charge based on the estimated state of charge and the historical state of charge corresponding to the target battery, the method further includes: When it is determined that the estimated state of charge is not to be verified, an energy storage index corresponding to the target battery is determined based on the estimated state of charge.

3. The method according to claim 1, characterized in that The determining whether to verify the estimated state of charge based on the estimated state of charge and the historical state of charge corresponding to the target battery includes: Determining whether a difference between the estimated state of charge and the historical state of charge is greater than a preset difference value threshold; When the difference between the estimated state of charge and the historical state of charge is not greater than the difference value threshold, determining that there is no need to verify the estimated state of charge; When the difference between the estimated state of charge and the historical state of charge is greater than the difference value threshold, acquiring historical discharge data corresponding to the target battery, the historical discharge data being collected after the historical state of charge is determined; Predicting a current state of charge based on the historical state of charge and the historical discharge data; A determination is made whether to verify the estimated state of charge based on the estimated state of charge and the current state of charge.

4. The method according to claim 3, characterized in that: The determining the energy storage index corresponding to the target battery based on the verified state of charge includes: In a case where it is determined that the estimated state of charge is to be verified based on the verified state of charge and the current state of charge, determining whether the current state of charge matches the verified state of charge; In the case where it is determined that the verified state of charge does not match the current state of charge, correcting the verified state of charge based on the current state of charge to obtain a corrected state of charge; An energy storage index corresponding to the target battery is determined based on the corrected state of charge.

5. The method according to claim 1, characterized in that The determining the energy storage index corresponding to the target battery based on the state parameter corresponding to the target battery includes: determining a state of charge of the target battery based on the state parameter; Determine an energy storage level interval corresponding to the target battery based on the state of charge; The energy storage index corresponding to the target battery is determined based on the level parameters corresponding to the energy storage level intervals, and the level parameters corresponding to different energy storage level intervals are different.

6. The method according to claim 1, characterized in that The decomposing the power supply demand based on the energy storage index corresponding to each of the target batteries to obtain the power supply parameters corresponding to each of the target batteries includes: Determine the power supply ratio of each of the target batteries based on the energy storage index corresponding to each of the target batteries; The power supply demand is decomposed based on the power supply ratio corresponding to each of the target batteries to obtain the power supply parameters corresponding to each of the target batteries.

7. The method according to claim 1, characterized in that The controlling the target battery to supply power based on the power supply parameter corresponding to the target battery also includes: Acquiring actual power supply data of the target battery; Determining whether the actual power supply data matches the power supply parameters; In the case where the actual power supply data does not match the power supply parameter, determining whether there is a candidate battery matching the state parameter of the target battery among the energy storage batteries that are not determined as the target battery; When there is a candidate battery whose state parameter matches the target battery, the candidate battery is controlled to supply power based on the power supply parameter corresponding to the target battery.

8. A battery management system, characterized in that: The battery management system includes at least two energy storage batteries, a controller connected to each of the energy storage batteries, and a power transmission module; The energy storage battery is used to store electrical energy, and to supply power externally or charge internally through the power transmission module under the control of the controller; The controller is used to execute the multi-battery balancing control management method according to any one of claims 1 to 7.

9. An electronic device, characterized in that: The electronic device comprises: at least one processor; Memory; At least one application, wherein the at least one application is stored in a memory and configured to be executed by at least one processor, and the at least one application is configured to: execute the multi-battery balancing control management method according to any one of claims 1 to 7.

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