Multi-battery equalization control management method, battery management system and equipment

Abstract

The invention relates to the technical field of battery management, and provides a multi-battery equalization control management method, a battery management system and equipment. The multi-battery equalization control management method comprises the following steps: determining a target battery from each energy storage battery based on a power supply demand corresponding to a power supply instruction; under the condition that at least two target batteries are determined, state parameters of all the target batteries are obtained; for each target battery, determining an energy storage index corresponding to the target battery based on the state parameter corresponding to the target battery; decomposing the power supply demand based on the energy storage index corresponding to each target battery to obtain a power supply parameter corresponding to each target battery; and for each target battery, controlling the target battery to supply power based on the power supply parameter corresponding to the target battery. In the technical scheme, the working state of the target battery can be reasonably determined in combination with the actual conditions of different target batteries, so that the equalization of different target batteries can be realized while the power supply demand is ensured to be met.

Description

Technical Field

[0001] The present application relates to the field of battery management technology, and in particular to a multi-battery balancing control management method, a battery management system and equipment. Background Art

[0002] When multiple energy storage batteries are connected in parallel to provide power, it is crucial to ensure the consistency of the states of the energy storage batteries and the stability of the power output, which has a direct impact on improving the reliability and efficiency of the system.

[0003] Related technologies usually adopt a fixed power allocation strategy or a simple voltage feedback mechanism to coordinate the output of different energy storage batteries.

[0004] However, although the methods in the related art can control the output of the energy storage battery to a certain extent, it is difficult to effectively deal with the problem of unbalanced states of the energy storage batteries in the battery pack, and therefore needs to be improved. Summary of the invention

[0005] In order to help achieve the state balance of different energy storage batteries, the present application provides a multi-battery balancing control management method, a battery management system and a device.

[0006] In a first aspect, the present application provides a multi-battery balancing control management method, which adopts the following technical solution: A multi-battery balancing control management method is used in a controller of a battery management system, wherein the battery management system further comprises at least two energy storage batteries connected to the controller, and the method comprises: 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, the target battery is controlled to supply power based on a power supply parameter corresponding to the target battery.

[0007] By adopting the above technical solution, when a power supply instruction is received, a target battery can be selected from various energy storage batteries, 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, so as to obtain the power supply parameters corresponding to each target battery, and control the corresponding target battery 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 conditions of different target batteries, so that the balance of different target batteries can be achieved while ensuring that the power supply demand is met.

[0008] Optionally, 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; 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.

[0009] 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 energy storage index finally determined.

[0010] 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, the method further includes: In a case where it is determined to verify the estimated state of charge, selecting a target verification method from at least one preset verification method based on the estimated 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.

[0011] 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. This can help 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 verification state of charge, and further helping to improve the accuracy of the energy storage index finally determined.

[0012] Optionally, the 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 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.

[0013] 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 further help improve the accuracy of the verification judgment result.

[0014] Optionally, 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.

[0015] By adopting the above technical solution, the verified state of charge can be corrected in combination with the current state of charge, which can help reduce the impact of errors in the process of determining the verified state of charge on the energy storage index, and further help improve the accuracy of the determined energy storage index.

[0016] Optionally, 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.

[0017] 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 range corresponding to the state of charge. In this way, the energy storage index can be determined in combination with the actual state of charge, which can help improve the accuracy of the determined energy storage index.

[0018] Optionally, 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.

[0019] Optionally, the controlling the target battery to supply power based on the power supply parameter corresponding to the target battery further 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.

[0020] By adopting the above technical scheme, 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 candidate battery that matches the state parameters of the target battery can be promptly determined. This can help to reduce the impact of the abnormality of the target battery on the power supply process, and further help to ensure the stability of the overall power supply.

[0021] In a second aspect, the present application provides a battery management system, which adopts the following technical solution: A battery management system, comprising 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 any one of the multi-battery balancing control management methods provided in the first aspect.

[0022] In a third aspect, the present application provides an electronic device, which adopts the following technical solution: An electronic device, comprising: 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 any one of the multi-battery balancing control management methods provided in the first aspect.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. The working state of the target battery can be reasonably determined based on the actual conditions of different target batteries, so that the balance of different target batteries can be achieved while ensuring that the power supply demand is met.

[0024] 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 energy storage index finally determined. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a flowchart of a multi-battery balancing management method provided in an embodiment of the present application; Figure 2 It is a flow chart of a method for determining an energy storage index provided in an embodiment of the present application; Figure 3 It is a flow chart of a method for estimating the state of charge verification and judgment provided in an embodiment of the present application; Figure 4 It is a flow chart of another method for determining an energy storage index provided in an embodiment of the present application; Figure 5 It is a flowchart of a power supply control method provided in an embodiment of the present application; Figure 6 It is a structural schematic diagram of a battery management system provided in an embodiment of the present application; Figure 7 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of this application more clear, the following Figure 1-7 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.

[0027] The embodiment of the present application discloses a multi-battery balancing control management method, which is used in a controller of a battery management system, wherein the battery management system also includes at least two energy storage batteries connected to the controller signal, and the at least two energy storage batteries are connected in parallel and can transmit electricity to the outside individually or in coordination. In actual implementation, the battery management system can be embedded in an energy storage system, a charging station, or a battery pack, as long as it can be implemented.

[0028] Reference Figure 1 , the multi-battery balancing control management method includes the following steps: Step 101: In response to a power supply instruction, determine a power supply requirement corresponding to the power supply instruction.

[0029] Specifically, the power supply instruction is used to instruct the external power supply through the energy storage battery. The power supply requirement is included in the power supply instruction, which may include at least one data related to power supply, such as power supply power, power supply current, power supply voltage, power supply protocol, etc. Furthermore, the power supply requirement may also include the required power supply amount, which can assist in determining the number of energy storage batteries to be enabled.

[0030] In one example, the power supply instruction is sent by other systems or devices to the battery management system, for example, the charging management system sends it to the battery management system. Accordingly, the charging management system and the battery management system exchange data through a reserved data interface.

[0031] In another example, the power supply instruction is generated by the battery management system. In this case, the battery management system provides a user interaction component and can receive user operations based on the user interaction component, and then generate corresponding power supply instructions based on the user operations. In actual implementation, the user interaction component can be implemented as a touch screen.

[0032] Step 102: determine a target battery from various energy storage batteries based on power supply requirements.

[0033] Specifically, since the number of energy storage batteries includes more than two, in the actual power supply process, some or all of the energy storage batteries can be selected for power supply based on actual conditions to ensure power supply efficiency. Therefore, it is necessary to determine the target battery used for power supply this time from each energy storage battery.

[0034] In actual implementation, the target battery may be determined based on at least one of the factors in the power supply requirement, such as the required current, the required voltage, and the required power supply amount.

[0035] In one example, the number of energy storage batteries to be activated according to the current demand may be determined in combination with the demand current. Furthermore, the target energy storage battery may be selected in combination with the current magnitude that can be provided by different energy storage batteries in their current states.

[0036] In another example, the number of energy storage batteries to be activated this time can be determined in combination with the required power supply. Furthermore, the target energy storage battery can be selected in combination with the remaining power or maximum power storage of different energy storage batteries.

[0037] Step 103 : when the determined target batteries include at least two, obtain the state parameters of each target battery.

[0038] Among them, the state parameter is used to reflect the state of the battery, and the state parameter is obtained and recorded by the controller based on the connection with the energy storage battery. Specifically, the state parameter may include at least one of the parameters that can reflect the battery state, such as open circuit voltage (OCV), charge and discharge current, internal resistance, temperature, etc.

[0039] Specifically, when the determined target batteries include at least two, it means that multiple target batteries need to be controlled simultaneously to supply power together. 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 state of the target batteries.

[0040] Step 104 : for each target battery, determine an energy storage index corresponding to the target battery based on a state parameter corresponding to the target battery.

[0041] The energy storage index is used to indicate the state of the battery. Specifically, the energy storage index is determined based on the state parameter, and the method of determining the energy storage index based on the state parameter is preset.

[0042] 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 influence on the battery state and the power transmission process, it is necessary to determine the state of charge as an energy storage index to take it into consideration in the process of power supply demand decomposition, which can help achieve a state balance of each energy storage battery.

[0043] Specifically, the state of charge can be calculated by an open circuit voltage method (OVC) or a neural network method. This embodiment does not limit the calculation method of the state of charge.

[0044] In actual implementation, energy storage indicators may also include battery health (State of Health, SOH), maximum power supply (State of Power, SOP), etc. In this way, energy storage indicators can more accurately reflect the status of the battery.

[0045] In some embodiments, an energy storage index corresponding to a target battery is determined based on state parameters corresponding to the target battery, including: determining a state of charge of the target battery based on the state parameters; determining an energy storage level interval corresponding to the target battery based on the state of charge; and determining an energy storage index corresponding to the target battery based on a level parameter corresponding to the energy storage level interval, wherein different energy storage level intervals correspond to different level parameters.

[0046] The energy storage level interval is obtained by dividing the value range of the state of charge, and different energy storage level intervals correspond to different level parameters.

[0047] In one example, the level parameter is directly determined as the energy storage index, so that the energy storage index can reflect the energy storage level interval to which the state of charge corresponding to the target battery belongs, so that the energy storage index can roughly reflect the state of charge of the target battery, reducing the impact of the state of charge calculation error on the determination of the energy storage index, which can help improve the accuracy of the determined energy storage index.

[0048] In another example, the energy storage index corresponding to the target battery is determined based on the level parameter corresponding to the energy storage level interval, including: determining the product of the level parameter and the state of charge as the energy storage index. Specifically, it was found during the research process that due to the accuracy error in the state of charge calculation process, and the accuracy corresponding to different state of charge ranges may be different, based on this, in this example, the energy storage level intervals can be divided based on the distribution of the state of charge accuracy, and the level parameters corresponding to the energy storage level intervals can be determined based on the accuracy of the state of charge corresponding to the energy storage level intervals, so as to compensate for the accuracy of the determined state of charge through the level parameters, which can help improve the accuracy of the energy storage index.

[0049] Step 105 , decomposing the power supply demand based on the energy storage index corresponding to each target battery to obtain the power supply parameter corresponding to each target battery.

[0050] The power supply parameter is used to indicate the way of supplying power to the battery pack. Specifically, the power supply parameter may include at least one of the parameters related to power supply, such as power supply current, power supply voltage, and power supply power.

[0051] 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 conditions of different target batteries, thereby achieving balance of different target batteries while ensuring that the power supply demand is met.

[0052] Optionally, the power supply demand is decomposed based on the energy storage index corresponding to each target battery to obtain the power supply parameters corresponding to each target battery, including: determining the power supply ratio of 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.

[0053] In an example, the energy storage indicator includes the state of charge, the power supply demand includes the demand current, and the power supply parameter includes the supply current. At this time, the power supply demand is decomposed based on the energy storage indicator corresponding to each target battery to obtain the power supply parameters corresponding to each target battery, including: 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 power supply current corresponding to each target battery.

[0054] Among them, the greater the state of charge, the greater the power supply weight, and accordingly, the greater the power supply weight, the greater the corresponding power supply current.

[0055] In actual implementation, the power supply demand may also be decomposed based on other energy storage indicators to obtain power supply parameters. The principle is the same as in the above example and will not be repeated in this embodiment.

[0056] Step 106 : for each target battery, control the target battery to supply power based on the power supply parameter corresponding to the target battery.

[0057] In one example, the power supply parameter includes a power supply current, and in this case the target battery may be controlled to supply power with a corresponding power supply current.

[0058] The implementation principle of the multi-battery balancing control management method of the embodiment of the present application is: in response to the 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; when the determined target batteries include at least two, 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 parameter corresponding to the target battery; 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; 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 scheme, when the power supply instruction is received, the 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, so that the working state of the target battery can be reasonably determined in combination with the actual conditions of different target batteries, so that the balancing of different target batteries can be achieved while ensuring that the power supply demand is met.

[0059] In some embodiments, reference Figure 2 In step 104, the energy storage index corresponding to the target battery is determined based on the state parameter corresponding to the target battery, including the following steps: Step 201 : using a preset initial estimation method to estimate the state of charge of a target battery based on state parameters to obtain an estimated state of charge.

[0060] The initial estimation method is preset. In one example, the initial estimation is generally used to roughly evaluate the state of charge, so the initial estimation method can adopt a method with small calculation amount and fast calculation speed, for example: the initial estimation method adopts the open circuit voltage method (OVC) for estimation.

[0061] 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.

[0062] The historical state of charge is a state of charge determined historically, and the historical state of charge is stored in a battery management system. In one example, the historical state of charge is collected at or after the last discharge of the target battery.

[0063] In one example, whether to verify the estimated state of charge is determined based on the difference between the estimated state of charge and the historical state of charge corresponding to the target battery. For example, if 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 verify the estimated state of charge; if 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 verify the estimated state of charge, or it can be determined in other ways whether to verify the estimated state of charge.

[0064] Step 203: When it is determined that the estimated state of charge is not to be verified, an energy storage indicator corresponding to the target battery is determined based on the estimated state of charge.

[0065] In the above technical solution, after the state of charge of the target battery is estimated using the initial estimation method, it is determined whether to verify the estimated state of charge in combination with the historical state of charge of the target battery, and if it is determined that the estimated state of charge is not to be verified, the energy storage index corresponding to the target battery is determined 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 energy storage index finally determined.

[0066] Based on the above technical solution, further reference is made to Figure 2 , step 202, 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, further comprising: Step 204 : When it is determined that the estimated state of charge is to be verified, a target verification method is selected from at least one preset verification method based on the estimated state of charge.

[0067] The verification method is a method for estimating the state of charge, and the verification method is different from the initial estimation method.

[0068] Specifically, during the research process, it was found that the accuracy of the state of charge prediction is related to the size of the state of charge, and the optimal prediction ranges corresponding to different state of charge prediction methods may be different. For example, one prediction method has a higher accuracy in predicting a state of charge with a larger value, while another prediction method has a higher accuracy in predicting a state of charge with a lower value.

[0069] Based on this, in order to help improve the accuracy of the verification results, 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 further help improve the accuracy of the verification results.

[0070] In one example, a target verification method is selected from at least one preset verification method based on the estimated state of charge, including: determining a 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.

[0071] The state range is obtained by dividing the value interval of the state of charge, for example, when the state of charge is expressed in percentage, the state range is obtained by dividing the range from 0 to 100%. Accordingly, the verification method corresponding to the state range is preset.

[0072] 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 may include factors such as current, voltage, and temperature, so that the estimated state of charge can be determined by comprehensively combining state parameters of different dimensions, which can help improve the accuracy of the estimated state of charge.

[0073] In another example, the verification method includes a voltage-time integration method, in which the change of voltage over time needs to be monitored, which can reduce the cumulative error in the verification process and thus help improve the accuracy of the verification result.

[0074] Step 205 , using a target verification method to estimate the state of charge of the target battery based on the state parameters, to obtain a verified state of charge.

[0075] Step 206: determine the energy storage index corresponding to the target battery based on the verified state of charge.

[0076] In one example, the verified state of charge is directly determined as the energy storage indicator.

[0077] In the above embodiment, when it is determined that the estimated state of charge is to be verified, a target verification method can be selected from at least one preset verification method based on the estimated state of charge, and the state of charge of the target battery is estimated based on the state parameters using the target verification method to obtain the verified state of charge to determine the energy storage index corresponding to the target battery. This can help improve the degree of matching 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 energy storage index finally determined.

[0078] In some embodiments, reference Figure 3 The above step 202, based on the estimated state of charge and the historical state of charge corresponding to the target battery, determines whether to verify the estimated state of charge, including the following steps: Step 301 , determining whether the difference between the estimated state of charge and the historical state of charge is greater than a preset difference value threshold.

[0079] In one example, the state of charge is expressed as a percentage, and the gap value threshold may be 5%.

[0080] Step 302 : if 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.

[0081] 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.

[0082] The historical discharge data is used to indicate the discharge condition, 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 data that can reflect the discharge condition, such as voltage change condition, current change condition, and power supply amount.

[0083] Step 304 , predicting the current state of charge based on the historical state of charge and the historical discharge data.

[0084] Specifically, since the historical discharge data can indicate the discharge condition of the battery after the historical state of charge, the current state of charge can be predicted by the historical state of charge and the historical discharge data.

[0085] Optionally, the current state of charge is predicted based on historical state of charge and historical discharge data, including: determining a historical discharge amount based on the historical discharge data; and adjusting the historical state of charge based on the historical discharge amount to obtain the current state of charge.

[0086] The historical discharge amount may be calculated from historical discharge data, for example, based on voltage changes and current changes in the historical discharge data, or may be directly recorded in the historical discharge data.

[0087] Step 305 : determining whether to verify the estimated state of charge based on the estimated state of charge and the current state of charge.

[0088] Optionally, determining whether to verify the estimated state of charge is based on the estimated state of charge and the current state of charge, including: 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, determining to verify the estimated state of charge; if not, determining not to verify the estimated state of charge.

[0089] In the above implementation, since the current state of charge can be further determined based on the historical discharge data and the historical state of charge when the gap between the estimated state of charge and the historical state of charge is greater than the preset gap value threshold, and whether to verify the estimated state of charge is determined based on the estimated state of charge and the current state of charge, this 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.

[0090] For further reference, Figure 4 The above step 206, determining the energy storage index corresponding to the target battery based on the verified state of charge, includes the following steps: Step 401 : in a case where it is determined based on the estimated state of charge and the current state of charge to verify the estimated state of charge, it is determined whether the verified state of charge matches the current state of charge.

[0091] 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 value threshold; if so, determining that the verified state of charge does not match the current state of charge; if not, determining that the verified state of charge matches the current state of charge.

[0092] Step 402: When it is determined that the verified state of charge does not match the current state of charge, the verified state of charge is corrected based on the current state of charge to obtain a corrected state of charge.

[0093] Optionally, the verified state of charge is corrected based on the current state of charge to obtain a corrected state of charge, including: determining a weighted average of the current state of charge and the verified state of charge as the corrected state of charge.

[0094] Among them, the weights of the current state of charge and the verification state of charge can be set in advance, or can also be set in combination with the method for determining the verification state of charge, for example: the weights of the verification 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 verification state of charge obtained by a verification method with high accuracy is large, and the weight of the verification 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 verification method, which can help improve the accuracy of the corrected state of charge finally determined.

[0095] Optionally, when it is determined that the verified state of charge matches the current state of charge, the verified state of charge may be directly determined as the energy storage indicator corresponding to the target battery.

[0096] Step 403: determine an energy storage index corresponding to the target battery based on the corrected state of charge.

[0097] Optionally, determining an 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.

[0098] In the above technical scheme, 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, it is further determined whether the verified state of charge matches the current state of charge, and when it is determined that the verified state of charge does not match the current state of charge, the verified state of charge is corrected based on the current state of charge, and the energy storage index corresponding to the target battery is determined based on the corrected state of charge, this can help reduce the impact of errors in the process of determining the verified state of charge on the energy storage index, and further help improve the accuracy of the determined energy storage index.

[0099] In some embodiments, reference Figure 5 The above step 106, controlling the target battery to supply power based on the power supply parameters corresponding to the target battery, includes the following steps: Step 501, obtaining actual power supply data of a target battery.

[0100] Among them, the actual power supply data is used to reflect the actual power supply situation of the target battery, such as: actual power supply current, actual power supply voltage, actual power supply power, etc. The type of the actual power supply parameter is consistent with the type of the power supply parameter. In actual implementation, the actual power supply data can be collected by the target battery itself, or it can be collected by a monitoring component (such as: current collection component, voltage collection component, etc.) corresponding to the target battery. This embodiment does not limit the method for obtaining the actual power supply data.

[0101] Step 502: Determine whether the actual power supply data matches the power supply parameters.

[0102] Specifically, since under normal circumstances the target battery should supply power according to the power supply parameters, the actual power supply data and the power supply parameters should match. However, when the target battery is abnormal, the actual power supply data may differ greatly from the power supply parameters, and the actual power supply data and the power supply parameters do not match.

[0103] Optionally, whether the actual power supply data matches the power supply parameters can be determined based on the size of the gap between the actual power supply data and the power supply parameters. For example, if 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 parameters; if 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 parameters.

[0104] Step 503: When the actual power supply data does not match the power supply parameters, it is determined whether there is a candidate battery that matches the state parameters of the target battery among the energy storage batteries that are not determined as the target battery.

[0105] The matching mode of the state parameters between different batteries is preset. In one example, whether the state parameters match can be determined based on the difference between the state parameters, for example, if the difference between the state parameters is less than or equal to a preset difference value threshold, the state parameters are determined to match.

[0106] In actual implementation, when the state parameters include more than two, whether the batteries match can be determined based on the matching relationship of at least one key parameter in the state parameters, or whether the batteries match can be determined based on the matching relationship of all state parameters. When matching is performed based on the gap between the state parameters, the gap value thresholds corresponding to different state parameters can be set separately based on the actual situation of the state parameters, which can help improve the accuracy of the matching results.

[0107] Furthermore, when the actual power supply data does not match the power supply parameters, it also includes: outputting abnormal prompt information corresponding to the target battery to prompt the target battery to handle the abnormality. Furthermore, the control of the target battery to supply power can be stopped to ensure the safety of the power supply process.

[0108] Step 504 : If there is a candidate battery whose state parameters match the target battery, control the candidate battery to supply power based on the power supply parameters corresponding to the target battery.

[0109] Optionally, when there is no candidate battery that matches the status parameters of the target battery, a supplementary power supply instruction can be generated directly based on the power supply parameters corresponding to the target battery, so as to again 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 the above steps 101 to 106, which will not be repeated here.

[0110] In the above technical scheme, in 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, and when it is determined that the actual power supply data does not match the power supply parameters, a standby battery that matches the state parameters of the target battery can be promptly determined, and the standby battery can be controlled to supply power based on the power supply parameters corresponding to the target battery. This can help to reduce the impact of the abnormality of the target battery on the power supply process, and further help to ensure the stability of the overall power supply.

[0111] The present application also provides a battery management system, referring 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 .

[0112] The energy storage battery 610 is used to store electric energy, and to supply power to the outside or charge the inside through the power transmission module 630 under the control of the controller 620 .

[0113] The controller 620 is used in the multi-battery balancing control management method provided by the above method embodiment.

[0114] The present application also provides an electronic device, such as Figure 7 As shown, Figure 7 The electronic device 700 shown includes: a processor 701 and a memory 703. The processor 701 and the memory 703 are connected, such as through a bus 702. Optionally, the electronic device 700 may also 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 on the embodiments of the present application.

[0115] Processor 701 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It may implement or execute various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. Processor 701 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like.

[0116] The bus 702 may include a path to transmit information between the above components. The bus 702 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus. The bus 702 may be divided into an address bus, a data bus, etc. For ease of representation, Figure 7 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0117] 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, or an EEPROM (Electrically Erasable Programmable Read Only Memory), a disk storage medium or other magnetic storage device, 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.

[0118] The memory 703 is used to store the application code for executing the solution of the present application, and the execution is controlled by the processor 701. The processor 701 is used to execute the application code stored in the memory 703 to implement the contents shown in the above method embodiment.

[0119] The electronic devices include, but are 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 terminal, etc. Figure 7 The electronic device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0120] It should be understood that although the steps in the flowchart of the accompanying drawings are shown in sequence according to the instructions of the arrows, these steps are not necessarily performed in the order indicated by the arrows. Unless otherwise clearly stated in this document, the execution of these steps is not strictly limited in order and can be performed in other orders.

[0121] The above are only some implementation methods of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present 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, the target battery is controlled to supply power based on a power supply parameter corresponding to the target battery.

2. 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: 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; 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 2, 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: In a case where it is determined to verify the estimated state of charge, selecting a target verification method from at least one preset verification method based on the estimated 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.

4. The method according to claim 3, 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.

5. The method according to claim 4, 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.

6. 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.

7. 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.

8. 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.

9. 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 8.

10. 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 8.

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