Battery cluster parallel operation control method and device, energy storage system, electronic equipment and medium

Abstract

The invention relates to a battery cluster parallel operation control method and device, an energy storage system, electronic equipment and a medium, the energy storage system comprises n battery clusters, data interaction is carried out between battery monitoring units based on a preset communication bus, and the method comprises the following steps: receiving battery pack parameters returned by the battery monitoring units according to a first time interval, obtaining battery cluster parameters according to a second time interval; calculating parallel operation rating scores of the battery clusters according to the battery pack parameters and the battery cluster parameters; determining the parallel operation level of the battery according to the parallel operation rating score; if the battery parallel operation level is greater than or equal to a preset level threshold value, sending a parallel operation channel occupation command to a preset communication bus; and if the parallel operation channel is successfully occupied, executing a preset parallel operation program. The battery parallel operation control scheme provided by the invention does not depend on an electric energy management system in the energy storage system, and a host and a slave do not need to be arranged in the battery cluster, so that the anti-risk capability of the energy storage system and the battery cluster parallel operation power-on robustness can be greatly improved.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage system parallel control, and in particular to a battery cluster parallel control method, device, energy storage system, electronic equipment and medium. Background Art

[0002] At present, there are no standardized requirements for the battery cluster paralleling methods adopted by various manufacturers in the market, and there are large differences in the paralleling methods adopted by different manufacturers. Some manufacturers use battery array management system (BAMS), power conversion system (PCS), or energy management system (EMS) for parallel control, but due to software differences between systems, there are some risks in control management. Some manufacturers also distinguish the BMS connected to different battery clusters as the host and slave, and use one of the battery clusters as the host to control other battery clusters for parallel operation, which will reduce the risk resistance of the energy storage system and cause host abnormalities, that is, system abnormalities. Summary of the invention

[0003] Based on this, it is necessary to provide a battery cluster parallel control method, device, energy storage system, electronic equipment and medium that can improve the safety and robustness of the parallel system in response to the above technical problems.

[0004] In a first aspect, the present application provides a battery cluster parallel control method, which is applied to a battery control unit of a battery cluster of an energy storage system, wherein the energy storage system includes n battery clusters, wherein each battery cluster includes a battery control unit and multiple battery packs, each battery pack is connected to a battery monitoring unit, and the battery control unit is respectively connected to each battery monitoring unit, and each battery monitoring unit exchanges data based on a preset communication bus. The method includes:

[0005] Receiving battery pack parameters sent back by each battery monitoring unit at a first time interval, and acquiring battery cluster parameters at a second time interval;

[0006] Calculating a parallel rating score of the battery cluster according to the battery pack parameters and the battery cluster parameters;

[0007] Determining a battery parallel level according to the parallel rating score;

[0008] If the battery parallel level is greater than or equal to a preset level threshold, sending a parallel channel occupation command to the preset communication bus;

[0009] If the parallel channel is occupied successfully, the preset parallel procedure will be executed.

[0010] In one embodiment, the calculating the parallel rating score of the battery cluster according to the battery pack parameters and the battery cluster parameters includes:

[0011] Calculating a target rating parameter according to the battery pack parameter and the battery cluster parameter, wherein the target rating parameter includes at least one of an average single cell voltage of the battery cluster, a battery internal resistance, a state of charge, and a state of health;

[0012] Calculate the rating score corresponding to each target rating parameter respectively to obtain multiple single rating scores;

[0013] A weighted sum operation is performed based on each single rating score and a preset weight value to obtain the parallel rating score of the battery cluster.

[0014] In one of the embodiments, the calculating the parallel rating score of the battery cluster according to the battery pack parameters and the battery cluster parameters further includes:

[0015] If the single rating score corresponding to any target rating parameter is less than the preset minimum score threshold, the parallel rating score of the battery cluster is determined to be a failed score, wherein the battery parallel level corresponding to the failed score is the lowest level.

[0016] In one embodiment, determining the battery parallel level according to the parallel rating score includes:

[0017] If the parallel rating score is greater than a first score threshold, determining that the battery parallel level is the first level;

[0018] If the parallel rating score is less than or equal to the first score threshold and greater than a second score threshold, determining that the battery parallel level is the second level, wherein the first score threshold is greater than the second score threshold;

[0019] If the parallel rating score is less than or equal to the second score threshold and greater than a third score threshold, determining that the battery parallel level is the third level, wherein the second score threshold is greater than the third score threshold;

[0020] If the parallel rating score is less than or equal to the third score threshold, the battery parallel level is determined to be the fourth level, wherein the parallel priority of the first level is higher than the parallel priority of the second level, the parallel priority of the second level is higher than the parallel priority of the third level, and the parallel priority of the third level is higher than the parallel priority of the fourth level.

[0021] In one embodiment, the method further comprises:

[0022] If the battery parallel level is less than a preset level threshold, it is determined that the battery cluster does not meet the parallel condition.

[0023] In one embodiment, executing the preset parallel program includes:

[0024] Determine whether the battery cluster has a preset fault;

[0025] If the battery cluster does not have a preset fault, a pre-charging procedure is executed, and the pre-charging current is detected in real time;

[0026] If the pre-charge current is less than the preset current threshold, it is determined that the pre-charge is completed;

[0027] After the pre-charging is completed, the relevant relays are operated to complete the battery cluster parallel connection.

[0028] In one embodiment, the method further comprises:

[0029] Determining whether the number of battery clusters in parallel in the energy storage system is greater than or equal to a preset number threshold;

[0030] If the number of battery clusters in parallel in the energy storage system is greater than or equal to a preset number threshold, it is determined that the battery clusters do not meet the parallel condition.

[0031] In one embodiment, the method further comprises:

[0032] Determine whether the ID information of the battery cluster is repeated with the ID information of the battery cluster that has been connected in parallel to the energy storage system;

[0033] If the ID information of the battery cluster is repeated with the ID information of the battery cluster that has been connected in parallel to the energy storage system, it is determined that the battery cluster does not meet the parallel connection condition.

[0034] In one embodiment, the method further comprises:

[0035] Determine whether the battery cluster has a preset fault;

[0036] If the battery cluster has a preset fault, a fault prompt message is sent to a preset terminal, and it is determined that the battery cluster does not meet the parallel condition.

[0037] In a second aspect, the present application further provides a battery cluster parallel control device, which is applied to a battery control unit of a battery cluster of an energy storage system, wherein the energy storage system includes n battery clusters, wherein each battery cluster includes a battery control unit and multiple battery packs, each battery pack is connected to a battery monitoring unit, and the battery control unit is respectively connected to each battery monitoring unit, and each battery monitoring unit exchanges data based on a preset communication bus, and the device includes:

[0038] A parameter acquisition module, used to receive the battery pack parameters sent back by each of the battery monitoring units at a first time interval, and to acquire the battery cluster parameters at a second time interval;

[0039] A score calculation module, used for calculating the parallel rating score of the battery cluster according to the battery pack parameters and the battery cluster parameters;

[0040] A level determination module, used to determine the battery parallel level according to the parallel rating score;

[0041] A command sending module, used for sending a parallel channel occupation command to the preset communication bus if the battery parallel level is greater than or equal to a preset level threshold;

[0042] The parallel execution module is used to execute the preset parallel program if the parallel channel is occupied successfully.

[0043] In a third aspect, the present application further provides an energy storage system, comprising n battery clusters, wherein each battery cluster comprises a battery control unit and a plurality of battery packs, each battery pack is connected to a battery monitoring unit, the battery control unit is respectively connected to each battery monitoring unit, and each battery monitoring unit exchanges data based on a preset communication bus;

[0044] The battery control unit is used to implement the battery cluster parallel control method described in the first aspect.

[0045] In a fourth aspect, the present application further provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the battery cluster parallel control method described in the first aspect are implemented.

[0046] In a fifth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the battery cluster parallel control method described in the first aspect are implemented.

[0047] In a sixth aspect, the present application further provides a computer program product, the computer program product comprising a computer program, which, when executed by a processor, implements the steps of the battery cluster parallel control method described in the first aspect.

[0048] In summary, the present application proposes a battery cluster parallel control method, device, energy storage system, electronic device and medium. The energy storage system includes n battery clusters. Each battery monitoring unit exchanges data based on a preset communication bus. The method includes: receiving battery pack parameters sent back by each battery monitoring unit at a first time interval, and obtaining battery cluster parameters at a second time interval; calculating the parallel rating score of the battery cluster according to the battery pack parameters and the battery cluster parameters; determining the battery parallel level according to the parallel rating score; if the battery parallel level is greater than or equal to the preset level threshold, sending a parallel channel occupation command to the preset communication bus; if the parallel channel occupation is successful, executing the preset parallel program. The battery parallel control scheme provided by the present invention does not rely on the power management system in the energy storage system, and does not need to set a master slave in the battery cluster, which can greatly improve the risk resistance of the energy storage system and the robustness of the battery cluster parallel power-on. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 is a structural block diagram of an energy storage system in one embodiment;

[0050] Figure 2 A schematic flow chart of a battery cluster parallel control method in one embodiment;

[0051] Figure 3 A schematic diagram of a flow chart of steps for calculating a battery cluster parallel rating score in one embodiment;

[0052] Figure 4 A schematic diagram of a flow chart of steps for determining a battery parallel level in one embodiment;

[0053] Figure 5 A schematic diagram of a flow chart of steps for executing a preset parallel program in one embodiment;

[0054] Figure 6 A schematic diagram of a flow chart of steps for determining whether a battery cluster meets the parallel connection condition in one embodiment;

[0055] Figure 7 A schematic flow chart of the steps of determining whether a battery cluster meets the parallel connection condition in another embodiment;

[0056] Figure 8 A schematic flow chart of steps for determining whether a battery cluster meets the parallel connection condition in another embodiment;

[0057] Fig. 9 is a structural block diagram of a battery cluster parallel control device in one embodiment;

[0058] Fig.10 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying 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.

[0060] The battery cluster parallel control method provided in the embodiment of the present application can be applied to Figure 1 In the energy storage system shown in FIG. , the energy storage system includes n battery clusters, where n is a positive integer, each battery cluster includes a battery control unit (BCU) and multiple battery packs (Packs), each battery pack is connected to a battery monitoring unit (BMU), the battery control unit is connected to each battery monitoring unit, and each battery monitoring unit exchanges data based on a preset communication bus.

[0061] In this embodiment, if Figure 1 As shown, each battery cluster includes n battery packs (Packs) connected in series, namely Pack1, Pack2 and Packn, etc., where n is a positive integer. And each Pack is connected to a corresponding BMU, and a corresponding battery cluster includes n BMUs, namely BMU1 corresponding to Pack1, BMU2 corresponding to Pack2 and BMUn corresponding to Packn. In actual application, BMU can be used to collect information such as battery cell voltage, battery temperature and battery balancing of each Pack at a preset time interval, where the preset time interval can be set to 100ms or other time, and the preset time interval can be configured according to the needs of the actual application scenario. Each Pack should include multiple battery modules, and each battery module includes at least one single cell.

[0062] In actual application scenarios, the energy storage system may also be provided with a power conversion system (PCS) or an energy management system (EMS). The BCU in the battery cluster communicates data with the BMU based on the CAN communication bus, RS4 communication bus or Net communication network, and the BCU communicates data with the PCS and / or EMS based on the CAN communication bus, RS4 communication bus or Net communication network to achieve information sharing and energy storage control in the energy storage system. In this embodiment, the energy storage system includes at least one BCU, PCS and EMS. The number of battery clusters in the energy storage system can be multiple, and the number of BCU, PCS and EMS can also be multiple. A suitable architecture can be configured for the energy storage system according to the needs of the actual application scenario.

[0063] As described in the background technology section above, the existing battery cluster parallel control method often needs to be combined with BAMS, PSC or EMS for parallel processing. However, due to the differences in the systems used by different manufacturers, the software corresponding to different systems is also different, which poses great risks in the management and control of battery clusters. During the long-term operation of the energy storage system, the voltage, capacity, internal resistance and life of the battery clusters vary to varying degrees. If the parallel strategies are incompatible, it is very easy to cause system failures and even safety accidents. And due to differences in software versions, maintenance costs are also relatively expensive.

[0064] This embodiment provides a battery cluster parallel control method, which can directly realize the parallel control of the battery cluster in the energy storage system based on the battery cluster terminal BCU. The equipment is relatively independent, the system coupling is lower, and the risk resistance is stronger. Moreover, since the BCUs are independent of each other and do not distinguish between master and slave devices, not only the equipment cost of the system is reduced, but also the risk resistance of the energy storage system is greatly improved.

[0065] In one embodiment, Figure 2 As shown, a battery cluster parallel control method is provided, and the method is applied to Figure 1 The battery control unit of the battery cluster of the energy storage system in FIG. 1 is taken as an example to illustrate, and the method includes the following steps:

[0066] S201, receiving battery pack parameters sent back by each battery monitoring unit at a first time interval, and acquiring battery cluster parameters at a second time interval.

[0067] In this embodiment, the battery pack parameters include parameters such as cell voltage, battery temperature, battery balancing state, battery internal resistance, etc. It should be noted that the battery pack parameters in this embodiment are operating parameters corresponding to each module and single cell in the battery pack collected by the BMU.

[0068] The battery cluster parameters include parameters such as battery cluster current, total voltage data, etc. It should be noted that the battery cluster parameters in this embodiment are operating parameters corresponding to each battery pack or all battery packs in the battery cluster collected by the BCU.

[0069] The first time interval and the second time interval can be the same time, or can be set to different times. The specific time values ​​of the first time interval and the second time interval can be adaptively configured according to the needs of the actual application scenario. For example, the first time interval can be configured to 100ms, and the second time interval can be configured to 10ms.

[0070] It should be noted that after the BCU and BMU obtain data, they can exchange data based on a preset communication bus to ensure that the BCU in each battery cluster can accurately obtain the actual status of all single cells in the battery cluster, so as to facilitate subsequent parallel control according to the operating status of the battery cluster.

[0071] S202, calculating a parallel rating score of the battery cluster according to the battery pack parameters and the battery cluster parameters.

[0072] In this embodiment, a corresponding parallel level is set for each battery cluster, and a parallel rating score calculation algorithm is designed to accurately evaluate the actual operating status of the battery cluster. Based on the parallel rating score calculation algorithm and the battery pack parameters and battery cluster parameters of the battery cluster, the parallel rating score of the battery cluster is calculated to ensure the quality of the battery clusters participating in the parallel control and the operating safety and stability of the energy storage system after the parallel operation.

[0073] In actual application, the state of charge (SOC) and state of health (SOH) of the battery cluster can be calculated based on the battery pack parameters and battery cluster parameters. Then, the corresponding single parallel rating scores are calculated based on the battery pack parameters, battery cluster parameters and each state. Finally, the parallel rating score of the corresponding battery cluster is calculated based on each single parallel rating score and its weight.

[0074] S203, determining the battery parallel level according to the parallel rating score.

[0075] In this embodiment, the battery parallel level is used to indicate the parallel priority of the battery cluster. A battery cluster with a higher parallel priority has a lower safety risk, and a battery cluster with a lower parallel priority has a higher safety risk.

[0076] The battery parallel level can be set to multiple levels, and the corresponding level thresholds can be set to mark the battery clusters whose battery parallel level is lower than the level threshold, so as to prevent the battery clusters with safety risks in the running state from participating in the battery cluster parallel control program. The battery clusters whose battery parallel level is greater than or equal to the level threshold are marked so that the battery clusters in good running state can participate in the battery cluster parallel control program.

[0077] This embodiment determines the battery parallel level through the parallel rating score, which can effectively distinguish battery clusters with different operating conditions, greatly improve the stability of the energy storage system after parallel operation, and effectively avoid safety risks of the energy storage system in the subsequent long-term operation process.

[0078] S204: If the battery parallel level is greater than or equal to a preset level threshold, a parallel channel occupation command is sent to a preset communication bus.

[0079] In this embodiment, the preset level threshold is used to distinguish between battery clusters that meet the parallel conditions and battery clusters that do not meet the parallel conditions. Among them, the battery cluster whose battery parallel level is greater than or equal to the preset level threshold is a battery cluster with a lower safety risk. The battery cluster whose battery parallel level is less than the preset level threshold is a battery cluster with a higher safety risk. It should be noted that the setting of the preset level threshold can be determined according to the number of divisions of the battery parallel level in the actual application scenario, which is not limited here.

[0080] The parallel channel occupation command is a control command requesting the use of the parallel channel. In actual application, the number of battery cluster parallel channels set in the energy storage system is limited. The parallel channels can process the parallel channel occupation commands in the order in which the parallel channel occupation commands are sent, or they can process the parallel channel occupation commands in the order in which the battery cluster IDs are arranged. It should be noted that the execution order priority of the parallel channel occupation command can be adaptively configured according to the needs of the actual application scenario.

[0081] In this embodiment, the communication protocol of the preset communication bus may include a corresponding signal receiving judgment step, which is used to identify whether the battery cluster that sends the parallel channel occupation command meets the preset parallel condition. The preset parallel condition includes that the battery parallel level is greater than or equal to the preset level threshold, the number of battery clusters that have been paralleled does not exceed the preset parallel number threshold, the ID of the battery cluster to be paralleled does not belong to the ID of the battery cluster that has been paralleled, and the battery cluster to be paralleled does not include a battery fault.

[0082] It should be noted that, when it is identified that the battery cluster that sends the parallel channel occupation command meets the preset parallel condition, it is determined whether the parallel channel is occupied successfully according to the actual state of the parallel channel. If the actual state of the parallel channel is unused, it is determined that the parallel channel is occupied successfully. If the actual state of the parallel channel is used, it is necessary to wait for the parallel channel to be executed, and then process the parallel channel occupation commands sent by each battery cluster in sequence according to the execution order set by the parallel channel.

[0083] S205: If the parallel channel is occupied successfully, execute the preset parallel procedure.

[0084] In this embodiment, if the communication protocol of the preset communication bus recognizes that the battery cluster to be paralleled meets the preset parallel conditions and the parallel channel is occupied successfully, the ID number of the battery cluster to be paralleled can be locked in the parallel channel so that the BCU of the battery cluster to be paralleled starts to execute the preset parallel program.

[0085] In this embodiment, the specific execution process of the preset parallel program can refer to the parallel execution method of the existing battery cluster, and is not specifically limited here.

[0086] In summary, this embodiment adopts a battery cluster parallel control method, which does not require the participation of PCS or EMS throughout the process. The BCU in the battery cluster serves as the initiator and receiver of the battery cluster parallel program, reducing the system coupling degree of the parallel control scheme in the energy storage system, making the equipment in the parallel control scheme more independent, and being able to directly analyze the safety status of the battery cluster through the BCU, so that the battery cluster with a safety status that meets the requirements can participate in the parallel program, preventing the battery cluster with safety risks from affecting the operation safety of the entire energy storage system after parallel operation. Not only does the independent equipment greatly improve the risk resistance of the energy storage system, but it also effectively saves the maintenance cost of the subsequent program maintenance of the energy storage system, and can conduct targeted troubleshooting of battery clusters with fault problems.

[0087] In one embodiment, Figure 3 As shown, the battery cluster parallel rating score is calculated based on the battery pack parameters and battery cluster parameters, including:

[0088] S301, calculating a target rating parameter according to a battery pack parameter and a battery cluster parameter, wherein the target rating parameter includes at least one of an average single cell voltage of the battery cluster, a battery internal resistance, a state of charge, and a state of health.

[0089] In this embodiment, the target rating parameter is used to indicate the operating status of each single cell in the battery cluster and the entire battery. If the indicator corresponding to the target rating parameter is abnormal, it means that there is a safety risk in the current battery cluster, and the battery cluster needs to be checked for safety according to the abnormal target rating parameter.

[0090] It should be noted that the target rating parameters may include the average cell voltage of the battery cluster, the battery internal resistance, the state of charge and the health state at the same time, or may only include one or more of the average cell voltage of the battery cluster, the battery internal resistance, the state of charge and the health state. In actual application, the target rating parameters may also be supplemented with other parameters indicating the battery operating status according to the needs of the actual application scenario.

[0091] S302, respectively calculating the rating score corresponding to each target rating parameter to obtain multiple single rating scores.

[0092] In this embodiment, it is assumed that the target rating parameters are the average cell voltage of the battery cluster, the battery internal resistance, the state of charge and the state of health.

[0093] The state of charge rating score is calculated using the following formula:

[0094]

[0095]

[0096] in, is the single rating score corresponding to the state of charge, is the average state of charge of the battery cluster that has been successfully connected. For the The state of charge of the battery cluster to be rated, is the preset state of charge difference threshold, It is used to indicate that the difference between the state of charge of the battery cluster to be rated and the average state of charge of the successfully connected battery clusters is greater than a preset state of charge difference threshold.

[0097] The formula for calculating the rating score corresponding to the health status is as follows:

[0098]

[0099]

[0100] in, is the single rating score corresponding to the health status, is the average health status of the battery clusters that have been successfully connected. For the The health status of the battery cluster to be rated, is the preset health status difference threshold, It is used to indicate the extent to which the difference between the health status of the battery cluster to be rated and the average health status of the battery clusters that have been successfully connected is greater than a preset health status difference threshold.

[0101]

[0102]

[0103] in, is the single rating score corresponding to the average single cell voltage of the battery cluster, is the average cell voltage of the battery cluster that has been successfully connected. For the The average cell voltage of the battery cluster, that is, the average cell voltage of the battery cluster to be rated, is the preset battery cluster average single cell voltage difference threshold, It is used to indicate the extent to which the difference between the average cell voltage of the battery cluster to be rated and the average cell voltage of the battery cluster that has been successfully connected is greater than a preset battery cluster average cell voltage difference threshold.

[0104]

[0105]

[0106] in, is the single rating score corresponding to the battery internal resistance, is the internal resistance of the battery cluster that has been successfully connected. For the The battery internal resistance of the battery cluster, that is, the battery internal resistance of the battery cluster to be rated, is the preset battery internal resistance difference threshold, It is used to indicate the extent to which the difference between the internal resistance of the battery cluster to be rated and the internal resistance of the battery cluster that has been successfully connected is greater than a preset battery internal resistance difference threshold.

[0107] Things to know: , , and Appropriate values ​​can be configured according to the needs of actual application scenarios. The value can be determined based on the number of battery clusters that have been successfully connected in parallel in actual application scenarios.

[0108] S303, performing a weighted sum operation based on each single rating score and a preset weight value to obtain a parallel rating score of the battery cluster.

[0109] In this embodiment, each single rating score has its corresponding weight. For example, is the weight corresponding to the single rating score of the state of charge, is the weight corresponding to the single rating score of the health status, is the weight corresponding to the average single cell voltage rating score, It is the weight corresponding to the single rating score of battery internal resistance.

[0110] The calculation formula for the parallel rating score of the battery cluster to be rated is as follows:

[0111]

[0112]

[0113] Among them, the battery cluster parallel rating score When any single rating score is less than or equal to 0, the value is 0. In one embodiment, if the single rating score corresponding to any target rating parameter is less than a preset minimum score threshold, the parallel rating score of the battery cluster is determined to be an unqualified score, wherein the battery parallel level corresponding to the unqualified score is the lowest level.

[0114] This embodiment provides a method for calculating the parallel rating score for each battery cluster. By simultaneously analyzing the target rating parameters of the battery cluster, such as the average single cell voltage, battery internal resistance, state of charge and health status, the operating status of the battery cluster connected to the preset communication bus in the energy storage system can be effectively obtained, ensuring that the battery clusters participating in the subsequent parallel program are all battery clusters in good health, thereby avoiding safety risks after the energy storage system is paralleled.

[0115] In one embodiment, if Figure 4 As shown in the figure, the battery parallel level is determined according to the parallel rating score, including:

[0116] S401, if the parallel rating score is greater than a first score threshold, determining that the battery parallel level is the first level;

[0117] S402, if the parallel rating score is less than or equal to a first score threshold and greater than a second score threshold, determining that the battery parallel level is a second level, wherein the first score threshold is greater than the second score threshold;

[0118] S403, if the parallel rating score is less than or equal to the second score threshold and greater than the third score threshold, determine that the battery parallel level is the third level, wherein the second score threshold is greater than the third score threshold;

[0119] S404: If the parallel rating score is less than or equal to the third score threshold, determine that the battery parallel level is the fourth level, wherein the first level parallel priority is higher than the second level parallel priority, the second level parallel priority is higher than the third level parallel priority, and the third level parallel priority is higher than the fourth level parallel priority.

[0120] In this embodiment, the battery parallel level can be divided into 4 levels, namely, level 0, level 1, level 2 and level 3. Among them, the first level is level 3, the second level is level 2, the third level is level 1, and the fourth level is level 0. The first score threshold can be set to 90, the second score threshold can be set to 75, and the third score threshold can be set to 60.

[0121] In one embodiment, the battery cluster parallel control method further includes:

[0122] If the battery parallel level is lower than the preset level threshold, it is determined that the battery cluster does not meet the parallel condition.

[0123] In actual application, the setting of the preset level threshold needs to be determined according to the situation of the divided battery parallel level. For example, if the battery parallel level is divided into 4 levels, the preset level threshold can be set to level 2, that is, battery clusters of level 0 and level 1 less than level 2 cannot participate in the parallel program.

[0124] In this embodiment, a battery cluster that is determined not to meet the parallel condition cannot participate in the subsequent parallel procedure, and the BCU of the battery cluster will not send a parallel channel occupation command to the preset communication bus.

[0125] In one embodiment, if Figure 5 As shown in the figure, execute the preset parallel procedure, including:

[0126] S501, determining whether a battery cluster has a preset fault.

[0127] S502: If the battery cluster does not have a preset fault, a pre-charging procedure is executed and the pre-charging current is detected in real time.

[0128] S503: If the pre-charge current is less than the preset current threshold, it is determined that the pre-charge is completed.

[0129] S504, after the pre-charging is completed, the relevant relays are operated to complete the battery cluster parallel operation.

[0130] In this embodiment, the preset parallel program includes a fault detection process and a pre-charging process. The BCU may execute a fault detection process once before sending a parallel channel occupation command, or may not execute the fault detection process. However, when executing the preset parallel program, the BCU will first determine whether the battery cluster is in a fault state. The preset fault includes a battery cluster fault such as a level 3 insulation fault.

[0131] During the pre-charging process, the BCU can first control the negative relay and pre-charging relay in the battery cluster electrical circuit to close, start the battery cluster power-on procedure first, and monitor the charging current and charging voltage provided by the battery cluster in real time. If the pre-charging current is greater than or equal to the charging current threshold set by the energy storage system, it is determined that the current battery cluster cannot be paralleled. It is necessary to wait until the parallel current is less than the set current threshold, then close the positive relay in the battery cluster electrical circuit, disconnect the pre-charging relay, and determine that the current battery cluster is successfully paralleled.

[0132] It should be noted that if the charging current is still greater than or equal to the charging current threshold set by the energy storage system after waiting for a certain period of time, it can be determined that the current battery cluster parallel connection has failed. It is necessary to check the cause of the current battery cluster parallel connection failure and re-execute the parallel connection procedure.

[0133] This embodiment ensures system safety and stability when the battery cluster participates in parallel operation by setting a fault detection process and a pre-charging process.

[0134] In actual application scenarios, before sending a parallel channel occupation command to the preset communication protocol, the BCU of each battery cluster will also detect the ID of the parallel battery cluster in the energy storage system to determine whether the current battery cluster meets the corresponding parallel conditions, so as to determine whether to send a parallel channel occupation command.

[0135] In one embodiment, if Figure 6 As shown, the battery cluster parallel control method also includes:

[0136] S601, determining whether the number of battery clusters in parallel in the energy storage system is greater than or equal to a preset number threshold;

[0137] S602: If the number of battery clusters in parallel in the energy storage system is greater than or equal to a preset number threshold, it is determined that the battery clusters do not meet the parallel condition.

[0138] In this embodiment, the number of battery clusters that can be connected in parallel in the energy storage system is limited. For example, the energy storage system stipulates that the number of battery clusters that can be connected in parallel is 20. At this time, if the number of battery cluster IDs that have been connected in parallel is less than 20, it is determined that the current battery cluster meets the requirements of the parallel level, and a parallel channel occupation command can be sent. If the number of battery cluster IDs that have been connected in parallel is greater than or equal to 20, it can be directly determined that the current battery cluster does not meet the parallel condition. The BCU will not send a parallel channel occupation command.

[0139] In one embodiment, if Figure 7 As shown, the battery cluster parallel control method also includes:

[0140] S701, determining whether the ID information of the battery cluster is repeated with the ID information of the battery cluster that has been connected in parallel to the energy storage system;

[0141] S702: If the ID information of the battery cluster is repeated with the ID information of the battery cluster that has been connected in parallel to the energy storage system, it is determined that the battery cluster does not meet the connection condition.

[0142] In this embodiment, the ID information of the battery clusters participating in the parallel operation in the energy storage system is repeated, indicating that the same battery cluster has sent the parallel channel occupation command multiple times. To avoid the same battery cluster sending the parallel channel occupation command multiple times, the BCU will first obtain the ID information of the battery clusters that have been paralleled in the energy storage system before sending the parallel channel occupation command each time, and compare the ID information of the current battery cluster with the ID information of the battery clusters that have been paralleled. If the same ID information exists, it means that the ID information of the battery cluster is repeated with the ID information of the battery clusters that have been paralleled in the energy storage system, and it can be determined that the current battery cluster does not meet the parallel conditions. The BCU will not send a parallel channel occupation command.

[0143] If the same ID information does not exist, it is determined that the current battery cluster meets the parallel level requirements, and a parallel channel occupation command can be sent.

[0144] In one embodiment, if Figure 8 As shown, the battery cluster parallel control method also includes:

[0145] S801, determining whether the battery cluster has a preset fault;

[0146] S802: If a preset fault exists in the battery cluster, a fault prompt message is sent to a preset terminal, and it is determined that the battery cluster does not meet the parallel condition.

[0147] In this embodiment, the preset faults include level 3 insulation faults, etc. It should be noted that the preset faults may be faults that may exist in the battery cluster that need to be identified and configured in advance. The method of identifying the preset faults may be based on the battery pack parameters and the battery cluster parameters, as well as the corresponding fault thresholds. This embodiment does not limit the method of identifying the preset faults, and it can be configured according to the needs of the actual application scenario.

[0148] In actual application, after the BCU identifies a preset fault in a battery cluster, it will send a fault prompt message to the user terminal to prompt the staff to troubleshoot the battery cluster with the corresponding battery cluster ID in the energy storage system. The BCU will determine that the battery cluster does not meet the parallel conditions and will not send a parallel channel occupation command. The BCU determines that the fault status of the battery cluster is cleared.

[0149] It should be noted that if the current battery cluster is in the parallel state, and the BCU identifies that there is a preset fault in the battery cluster, the BCU will control the current battery cluster to automatically exit the parallel state, and after the fault state is restored, that is, after being cleared, it will send the parallel channel occupation command again and re-integrate into the energy storage system.

[0150] When the BCU in this embodiment determines whether the battery cluster meets the parallel condition, it may only execute one step of determining whether the parallel condition is met in the above embodiment, or it may execute all steps of determining whether the parallel condition is met in the above embodiment, and it may be configured according to the actual needs of the energy storage system in the actual application scenario.

[0151] In summary, this embodiment provides a battery cluster parallel control method, which determines whether the battery cluster meets the parallel conditions and whether the battery cluster parallel level is greater than or equal to the preset level threshold through the BCU in the battery cluster. When the parallel conditions are met and the parallel level meets the requirements, an occupation command is directly sent to the parallel channel, and each battery cluster in the energy storage system is used as an execution unit to realize the parallel control of the battery cluster in the energy storage system. The coupling of the energy storage system to realize the parallel control can be greatly dispersed, and the stability of the parallel control can be greatly improved through the multiple parallel condition judgments of the BCU, ensuring that the battery clusters with lower safety risks participate in the parallel control program in the energy storage system, and the battery clusters with high safety risks are excluded. In addition, the ID information of the faulty battery cluster can be sent to the user in time, so that the staff can conduct safety inspections on the problem battery clusters to ensure the safety of the energy storage system.

[0152] In actual use, the battery cluster parallel control method provided in this embodiment does not require additional power management equipment, nor does it rely on unified parallel software, which greatly reduces the equipment cost and maintenance cost of the battery cluster participating in the parallel control in the energy storage system. And the safety performance of the energy storage system parallel solution can be improved by flexibly adjusting the preset level threshold and setting a higher preset level threshold. Setting a lower preset level threshold can obtain a more robust energy storage system parallel architecture.

[0153] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0154] Based on the same inventive concept, the embodiment of the present application also provides a battery cluster parallel control device for implementing the battery cluster parallel control method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more battery cluster parallel control device embodiments provided below can refer to the limitations of the battery cluster parallel control method above, and will not be repeated here.

[0155] In one embodiment, Fig. 9 As shown, a battery cluster parallel control device 900 is provided, comprising: a parameter acquisition module 910, a score calculation module 920, a level determination module 930, a command sending module 940 and a parallel execution module 950, wherein:

[0156] The parameter acquisition module 910 is used to receive the battery pack parameters sent back by each battery monitoring unit at a first time interval, and acquire the battery cluster parameters at a second time interval;

[0157] A score calculation module 920, used to calculate the parallel rating score of the battery cluster according to the battery pack parameters and the battery cluster parameters;

[0158] A level determination module 930, configured to determine a battery parallel level according to the parallel rating score;

[0159] A command sending module 940, configured to send a parallel channel occupation command to a preset communication bus if the battery parallel level is greater than or equal to a preset level threshold;

[0160] The parallel execution module 950 is used to execute a preset parallel program if the parallel channel is occupied successfully.

[0161] In one embodiment, the score calculation module 920 is specifically used to calculate the target rating parameters based on the battery pack parameters and the battery cluster parameters, wherein the target rating parameters include at least one of the average single cell voltage, battery internal resistance, state of charge and health state of the battery cluster; calculate the rating score corresponding to each target rating parameter respectively to obtain multiple single rating scores; and perform a weighted sum operation based on each single rating score and a preset weight to obtain the parallel rating score of the battery cluster.

[0162] In one embodiment, the score calculation module 920 is specifically used to determine that the parallel rating score of the battery cluster is an unqualified score if the single rating score corresponding to any target rating parameter is less than a preset minimum score threshold, wherein the battery parallel level corresponding to the unqualified score is the lowest level.

[0163] In one embodiment, the level determination module 930 is specifically used to determine that the battery parallel level is the first level if the parallel rating score is greater than the first score threshold; if the parallel rating score is less than or equal to the first score threshold and greater than the second score threshold, determine that the battery parallel level is the second level, wherein the first score threshold is greater than the second score threshold; if the parallel rating score is less than or equal to the second score threshold and greater than the third score threshold, determine that the battery parallel level is the third level, wherein the second score threshold is greater than the third score threshold; if the parallel rating score is less than or equal to the third score threshold, determine that the battery parallel level is the fourth level, wherein the first level parallel priority is higher than the second level parallel priority, the second level parallel priority is higher than the third level parallel priority, and the third level parallel priority is higher than the fourth level parallel priority.

[0164] In one embodiment, the parallel execution module 950 is specifically used to determine whether the battery cluster has a preset fault; if the battery cluster does not have a preset fault, execute the pre-charging program and detect the pre-charging current in real time; if the pre-charging current is less than the preset current threshold, determine that the pre-charging is completed; after the pre-charging is completed, operate the relevant relays to complete the parallel connection of the battery cluster.

[0165] In summary, this embodiment provides a battery cluster parallel control device, which determines whether the battery cluster meets the parallel conditions and whether the parallel level of the battery cluster is greater than or equal to the preset level threshold through the BCU in the battery cluster. When the parallel conditions are met and the parallel level meets the requirements, an occupation command is directly sent to the parallel channel, and each battery cluster in the energy storage system is used as an execution unit to realize the parallel control of the battery cluster in the energy storage system. The coupling of the energy storage system to realize the parallel control can be greatly dispersed, and the stability of the parallel control can be greatly improved through the multiple parallel condition judgments of the BCU, ensuring that the battery clusters with lower safety risks participate in the parallel control program in the energy storage system, and the battery clusters with high safety risks are excluded. In addition, the ID information of the faulty battery cluster can be sent to the user in time, so that the staff can conduct safety inspections on the problem battery clusters to ensure the safety of the energy storage system.

[0166] Each module in the above battery cluster parallel control device can be implemented in whole or in part by software, hardware or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute the corresponding operations of each module.

[0167] In one embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as follows: Fig.10 As shown. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a battery cluster parallel control method is realized. The display unit of the computer device is used to form a visually visible picture, which can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device shell, or an external keyboard, touchpad or mouse.

[0168] Those skilled in the art will understand that Fig.10 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0169] In one embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0170] Receiving battery pack parameters sent back by each battery monitoring unit at a first time interval, and acquiring battery cluster parameters at a second time interval;

[0171] Calculate the battery cluster parallel rating score based on the battery pack parameters and battery cluster parameters;

[0172] Determine the battery parallel level based on the parallel rating score;

[0173] If the battery parallel level is greater than or equal to the preset level threshold, a parallel channel occupation command is sent to the preset communication bus;

[0174] If the parallel channel is occupied successfully, the preset parallel procedure will be executed.

[0175] In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0176] Receiving battery pack parameters sent back by each battery monitoring unit at a first time interval, and acquiring battery cluster parameters at a second time interval;

[0177] Calculate the battery cluster parallel rating score based on the battery pack parameters and battery cluster parameters;

[0178] Determine the battery parallel level based on the parallel rating score;

[0179] If the battery parallel level is greater than or equal to the preset level threshold, a parallel channel occupation command is sent to the preset communication bus;

[0180] If the parallel channel is occupied successfully, the preset parallel procedure will be executed.

[0181] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0182] Receiving battery pack parameters sent back by each battery monitoring unit at a first time interval, and acquiring battery cluster parameters at a second time interval;

[0183] Calculate the battery cluster parallel rating score based on the battery pack parameters and battery cluster parameters;

[0184] Determine the battery parallel level based on the parallel rating score;

[0185] If the battery parallel level is greater than or equal to the preset level threshold, a parallel channel occupation command is sent to the preset communication bus;

[0186] If the parallel channel is occupied successfully, the preset parallel procedure will be executed.

[0187] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0188] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0189] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A battery cluster parallel control method, characterized in that: A battery control unit for a battery cluster of an energy storage system, wherein the energy storage system includes n battery clusters, wherein each battery cluster includes a battery control unit and multiple battery packs, each battery pack is connected to a battery monitoring unit, the battery control unit is connected to each battery monitoring unit respectively, and each battery monitoring unit exchanges data based on a preset communication bus, and the method includes: Receiving battery pack parameters sent back by each battery monitoring unit at a first time interval, and acquiring battery cluster parameters at a second time interval; Calculating a parallel rating score of the battery cluster according to the battery pack parameters and the battery cluster parameters; Determining a battery parallel level according to the parallel rating score; If the battery parallel level is greater than or equal to a preset level threshold, sending a parallel channel occupation command to the preset communication bus; If the parallel channel is occupied successfully, the preset parallel procedure will be executed.

2. The method according to claim 1, characterized in that The calculating the parallel rating score of the battery cluster according to the battery pack parameters and the battery cluster parameters includes: Calculating a target rating parameter according to the battery pack parameter and the battery cluster parameter, wherein the target rating parameter includes at least one of an average single cell voltage of the battery cluster, a battery internal resistance, a state of charge, and a state of health; Calculate the rating score corresponding to each target rating parameter respectively to obtain multiple single rating scores; A weighted sum operation is performed according to each single rating score and a preset weight value to obtain the parallel rating score of the battery cluster.

3. The method according to claim 2, characterized in that The calculating the parallel rating score of the battery cluster according to the battery pack parameters and the battery cluster parameters further includes: If the single rating score corresponding to any target rating parameter is less than the preset minimum score threshold, the parallel rating score of the battery cluster is determined to be a failed score, wherein the battery parallel level corresponding to the failed score is the lowest level.

4. The method according to claim 1, characterized in that The determining the battery parallel level according to the parallel rating score includes: If the parallel rating score is greater than a first score threshold, determining that the battery parallel level is the first level; If the parallel rating score is less than or equal to the first score threshold and greater than a second score threshold, determining that the battery parallel level is the second level, wherein the first score threshold is greater than the second score threshold; If the parallel rating score is less than or equal to the second score threshold and greater than a third score threshold, determining that the battery parallel level is the third level, wherein the second score threshold is greater than the third score threshold; If the parallel rating score is less than or equal to the third score threshold, the battery parallel level is determined to be the fourth level, wherein the parallel priority of the first level is higher than the parallel priority of the second level, the parallel priority of the second level is higher than the parallel priority of the third level, and the parallel priority of the third level is higher than the parallel priority of the fourth level.

5. The method according to claim 1, characterized in that The method further comprises: If the battery parallel level is less than a preset level threshold, it is determined that the battery cluster does not meet the parallel condition.

6. The method according to any one of claims 1 to 5, characterized in that: The execution of the preset parallel program includes: Determine whether the battery cluster has a preset fault; If the battery cluster does not have a preset fault, a pre-charging procedure is executed, and the pre-charging current is detected in real time; If the pre-charge current is less than the preset current threshold, it is determined that the pre-charge is completed; After the pre-charging is completed, the relevant relays are operated to complete the battery cluster parallel connection.

7. The method according to claim 1, characterized in that The method further comprises: Determining whether the number of battery clusters in parallel in the energy storage system is greater than or equal to a preset number threshold; If the number of battery clusters in parallel in the energy storage system is greater than or equal to a preset number threshold, it is determined that the battery clusters do not meet the parallel condition.

8. The method according to claim 1, characterized in that The method further comprises: Determine whether the ID information of the battery cluster is repeated with the ID information of the battery cluster that has been connected in parallel to the energy storage system; If the ID information of the battery cluster is repeated with the ID information of the battery cluster that has been connected in parallel to the energy storage system, it is determined that the battery cluster does not meet the parallel connection condition.

9. The method according to claim 1, characterized in that: The method further comprises: Determine whether the battery cluster has a preset fault; If the battery cluster has a preset fault, a fault prompt message is sent to a preset terminal, and it is determined that the battery cluster does not meet the parallel condition.

10. A battery cluster parallel control device, characterized in that: A battery control unit for a battery cluster of an energy storage system, wherein the energy storage system includes n battery clusters, wherein each battery cluster includes a battery control unit and multiple battery packs, each battery pack is connected to a battery monitoring unit, the battery control unit is respectively connected to each battery monitoring unit, and each battery monitoring unit exchanges data based on a preset communication bus, and the device includes: A parameter acquisition module, used to receive the battery pack parameters sent back by each of the battery monitoring units at a first time interval, and to acquire the battery cluster parameters at a second time interval; A score calculation module, used for calculating the parallel rating score of the battery cluster according to the battery pack parameters and the battery cluster parameters; A level determination module, used to determine the battery parallel level according to the parallel rating score; A command sending module, used for sending a parallel channel occupation command to the preset communication bus if the battery parallel level is greater than or equal to a preset level threshold; The parallel execution module is used to execute the preset parallel program if the parallel channel is occupied successfully.

11. An energy storage system, characterized in that: The invention comprises n battery clusters, wherein each battery cluster comprises a battery control unit and a plurality of battery packs, each battery pack is connected to a battery monitoring unit, the battery control unit is respectively connected to each battery monitoring unit, and each battery monitoring unit exchanges data based on a preset communication bus; The battery control unit is used to implement the battery cluster parallel control method according to any one of claims 1 to 9.

12. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the battery cluster parallel control method according to any one of claims 1 to 9 are implemented.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the battery cluster parallel control method according to any one of claims 1 to 9 are implemented.

Images