Energy storage system control method, controller, battery compartment and energy storage system

Abstract

The invention relates to the technical field of energy storage systems, particularly provides an energy storage system control method, a controller, a battery compartment and an energy storage system, and aims to solve the problems of how to effectively monitor operation alarm information of various battery clusters in real time and how to control operation of the battery clusters according to the operation alarm information. According to the technical scheme, battery clusters, BCUs, cluster switch units and PCS4 in the string type energy storage system are in one-to-one correspondence, and the BCUs are set to obtain operation alarm information of the battery clusters and control operation of the battery clusters based on the operation alarm information. Through the technical scheme that the battery clusters, the first controllers, the cluster switch units and the PCS4 are in one-to-one correspondence and are managed one by one, the balance and the charging and discharging efficiency of the battery clusters are improved, and meanwhile the real-time performance and the reliability of cluster management are improved. According to alarm information of different grades, strategies of reducing charging / discharging power extreme values to different degrees are adopted, good temperature uniformity is achieved, the service life of a battery can be prolonged, and the stability of an energy storage system is improved.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage systems, and specifically provides an energy storage system control method, a controller, a battery compartment, and an energy storage system. Background Art

[0002] The string energy storage system is currently the most promising energy storage system solution. Its structural feature is that each battery cluster corresponds to an independent PCS (Power Conversion System) unit, which can effectively avoid the problems of inter-cluster circulation and faulty clusters affecting the operation of other normal battery clusters in centralized energy storage systems.

[0003] For the independent battery clusters and PCS in the string energy storage system, how to monitor the various operation alarm information of each battery cluster in real time and effectively, control the operation of the battery cluster in time according to the operation alarm information, enhance the temperature uniformity of the system, avoid the impact of single cluster battery failure on the battery compartment and energy storage system, and thus improve the safety and reliability of the energy storage system has become an urgent problem to be solved.

[0004] Accordingly, the art needs a new energy storage system control solution to solve the above problems. Summary of the invention

[0005] The present application aims to solve or at least partially solve the above technical problem, that is, to solve the problem of how to monitor the operation alarm information of various battery clusters in real time and effectively, and to control the operation of the battery cluster in time according to the operation alarm information.

[0006] In a first aspect, a method for controlling an energy storage system is provided, the method comprising: a method for controlling an energy storage system, the energy storage system comprising at least one battery compartment, the battery compartment comprising at least one battery cluster, wherein the battery cluster corresponds one-to-one with a PCS in the energy storage system, the method comprising: Acquiring a battery cluster operating state, wherein the battery cluster operating state includes a charging operating state and a discharging operating state; Acquiring operation alarm information of the battery cluster related to the operation state of the battery cluster; Based on the battery cluster operating state and the operating alarm information, the battery cluster operation is controlled.

[0007] In a technical solution of the above energy storage system control method, the obtaining of operation alarm information of the battery cluster related to the operation status of the battery cluster includes: When the battery cluster operation state is the charging operation state, acquiring charging operation alarm information of the battery cluster, wherein the charging operation alarm information includes one or more of single cell voltage alarm information, single cell pressure difference alarm information, total voltage alarm information, cluster charging current alarm information, cluster charging battery temperature alarm information and high voltage insulation alarm information; The controlling the operation of the battery cluster based on the operation state of the battery cluster and the operation alarm information includes: Based on the charging alarm level corresponding to the charging operation alarm information, the charging operation of the battery cluster is controlled.

[0008] In a technical solution of the above energy storage system control method, the obtaining of operation alarm information of the battery cluster related to the operation status of the battery cluster includes: When the battery cluster operation state is a discharge operation state, obtaining discharge operation alarm information of the battery cluster, wherein the discharge operation alarm information includes one or more of single cell voltage alarm information, single cell pressure difference alarm information, total voltage alarm information, cluster discharge current alarm information, cluster discharge battery temperature alarm information and high voltage insulation alarm information; The controlling the operation of the battery cluster based on the operation state of the battery cluster and the operation alarm information includes: Based on the discharge warning level corresponding to the discharge operation warning information, the discharge operation of the battery cluster is controlled.

[0009] In a technical solution of the above energy storage system control method, the single cell voltage warning information includes: single cell voltage three levels higher, single cell voltage two levels higher and single cell voltage one level higher; The monomer pressure difference alarm information includes: monomer pressure difference greater than level 2 and monomer pressure difference greater than level 1; The total voltage alarm information includes: total voltage three levels higher, total voltage two levels higher and total voltage one level higher; The cluster charging current alarm information includes: cluster charging current three levels high, cluster charging current two levels high and cluster charging current one level high; The cluster rechargeable battery temperature alarm information includes: cluster rechargeable battery temperature is two levels low, cluster rechargeable battery temperature is one level low, cluster rechargeable battery temperature is two levels high, and cluster rechargeable battery temperature is one level high; The high-voltage insulation alarm information includes: high-voltage insulation low level 2 and high-voltage insulation low level 1. The controlling the charging operation of the battery cluster based on the charging alarm level corresponding to the charging operation alarm information includes: When the charging operation alarm information is any one of the three-level charging alarm information, controlling the current charging power extreme value of the battery cluster to drop to the first charging power extreme value, wherein the three-level charging alarm information includes: the single cell voltage is three levels higher, the total voltage is three levels higher, and the cluster charging current is three levels higher; When the charging operation alarm information is any one of the second-level charging alarm information, the current charging power extreme value of the battery cluster is controlled to be reduced to the second charging power extreme value, wherein the second charging power extreme value is less than the first charging power extreme value, and the first charging power extreme value is less than the rated charging power of the battery cluster, and wherein the second-level charging alarm information includes: the single cell voltage is two levels higher, the single cell voltage difference is two levels higher, the total voltage is two levels higher, the cluster charging current is two levels higher, the cluster charging battery temperature is two levels lower, the cluster charging battery temperature is two levels higher, and the high-voltage insulation is two levels lower; When the charging operation alarm information includes any one of the first-level charging alarm information, the battery cluster is controlled to shut down, wherein the first-level charging alarm information includes: the single cell voltage is one level higher, the single cell voltage difference is one level higher, the total voltage is one level higher, the cluster charging current is one level higher, the cluster charging battery temperature is one level lower, the cluster charging battery temperature is one level higher and the high-voltage insulation is one level lower.

[0010] In a technical solution of the above energy storage system control method, the controlling the charging operation of the battery cluster based on the charging alarm level corresponding to the charging operation alarm information further includes: Counting different types of charging level 3 warning information to obtain a first cumulative number; When the first accumulated number is greater than or equal to a first number threshold, controlling the current charging power limit of the battery cluster to decrease to a third charging power limit, wherein the third charging power limit is less than the first charging power limit; Counting different types of charging level 2 warning information to obtain a second cumulative number; When the second accumulated number is greater than or equal to a second number threshold, the battery cluster is controlled to shut down, or the current charging power extreme value of the battery cluster is controlled to drop to a fourth charging power extreme value, wherein the fourth charging power extreme value is less than or equal to the second charging power extreme value.

[0011] In a technical solution of the energy storage system control method, the cluster rechargeable battery temperature warning information also includes the cluster rechargeable battery temperature being three levels higher, The controlling the charging operation of the battery cluster based on the charging alarm level corresponding to the charging operation alarm information further includes: When the charging operation alarm information is at least one of the three levels of charging alarm information, and the cluster rechargeable battery temperature alarm information is that the cluster rechargeable battery temperature is three levels higher, obtaining a cluster rechargeable battery temperature change trend; When the temperature variation trend of the cluster rechargeable battery is rising, the current charging power limit of the battery cluster is controlled to decrease to a fifth charging power limit, wherein the fifth charging power limit is less than the first charging power limit.

[0012] In a technical solution of the above energy storage system control method, the single cell voltage warning information includes: single cell voltage is three levels low, single cell voltage is two levels low and single cell voltage is one level low. The monomer pressure difference alarm information includes: monomer pressure difference greater than level 2 and monomer pressure difference greater than level 1. The total voltage alarm information includes: total voltage is three levels low, total voltage is two levels low and total voltage is one level low. The cluster discharge current alarm information includes: cluster discharge current three levels high, cluster discharge current two levels high and cluster discharge current one level high. The cluster discharge battery temperature alarm information includes: cluster discharge battery temperature low level 2, cluster discharge battery temperature low level 1, cluster discharge battery temperature high level 2, and cluster discharge battery temperature high level 1. The high-voltage insulation alarm information includes: high-voltage insulation low level 2 and high-voltage insulation low level 1. The controlling the battery cluster to discharge based on the discharge warning level corresponding to the discharge operation warning information includes: When the discharge operation alarm information is any one of the three-level discharge alarm information, controlling the current discharge power extreme value of the battery cluster to drop to the first discharge power extreme value, wherein the three-level discharge alarm information includes: the single cell voltage is three levels lower, the total voltage is three levels lower, and the cluster discharge current is three levels higher; When the discharge operation alarm information includes any one of the discharge level 2 alarm information, the current discharge power extreme value of the battery cluster is controlled to be reduced to the second discharge power extreme value, wherein the second discharge power extreme value is less than the first discharge power extreme value, the first discharge power extreme value is less than the rated discharge power of the battery cluster, and wherein the discharge level 2 alarm information includes: the single cell voltage is two levels lower, the single cell voltage difference is two levels higher, the total voltage is two levels lower, the cluster discharge current is two levels higher, the cluster discharge battery temperature is two levels lower, the cluster discharge battery temperature is two levels higher, and the high voltage insulation is two levels lower; When the discharge operation alarm information includes any one of the first-level discharge alarm information, the battery cluster is controlled to shut down, wherein the first-level discharge alarm information includes: the single cell voltage is one level lower, the single cell voltage difference is one level higher, the total voltage is one level lower, the cluster discharge current is one level higher, the cluster discharge battery temperature is one level lower, the cluster discharge battery temperature is one level higher and the high-voltage insulation is one level lower.

[0013] In a technical solution of the above energy storage system control method, the controlling the discharge operation of the battery cluster based on the discharge alarm level corresponding to the discharge operation alarm information further includes: Counting different types of the third-level discharge warning information to obtain a third cumulative number; When the third accumulated number is greater than or equal to a third number threshold, controlling the current discharge power limit of the battery cluster to decrease to a third discharge power limit, wherein the third discharge power limit is less than the first discharge power limit; Counting different types of discharge level 2 warning information to obtain a fourth cumulative number; When the fourth accumulated number is greater than or equal to a fourth number threshold, the battery cluster is controlled to shut down, or the current discharge power limit of the battery cluster is controlled to drop to a fourth discharge power limit, wherein the fourth discharge power limit is less than or equal to the second discharge power limit.

[0014] In a technical solution of the energy storage system control method, the cluster discharge battery temperature alarm information also includes a cluster discharge battery temperature three levels higher, The controlling the battery cluster to discharge based on the discharge alarm level corresponding to the discharge alarm information further includes: When the discharge operation alarm information includes at least one of the three levels of discharge alarm information, and the cluster discharge battery temperature alarm information indicates that the cluster discharge battery temperature is three levels higher, obtaining a cluster discharge battery temperature change trend; When the temperature variation trend of the cluster discharge battery is rising, the current discharge power limit of the battery cluster is controlled to drop to a fifth discharge power limit, wherein the fifth discharge power limit is smaller than the first discharge power limit.

[0015] In a technical solution of the above energy storage system control method, the single cell pressure difference alarm information includes: single cell pressure difference is three levels large, The cluster charging battery temperature warning information includes: cluster charging battery temperature low three levels and cluster charging battery temperature high three levels. The cluster discharge battery temperature warning information includes: cluster discharge battery temperature low three levels and cluster discharge battery temperature high three levels. High voltage insulation warning information includes: high voltage insulation low level three, The method further comprises: When the operation alarm information includes any one of the following: the single cell pressure difference is three levels greater, the cluster charging battery temperature is three levels lower, the cluster charging battery temperature is three levels higher, the cluster discharging battery temperature is three levels lower, the cluster discharging battery temperature is three levels higher, and the high-voltage insulation is three levels lower, a first prompt information is sent to the user.

[0016] In a second aspect, a controller is provided, comprising a processor and a storage device, wherein the storage device is suitable for storing a plurality of program codes, and the program codes are suitable for being loaded and run by the processor to execute any one of the technical solutions of the above-mentioned energy storage system control method.

[0017] In a third aspect, a battery compartment is provided, which is applied to an energy storage system, wherein the battery compartment includes a battery cluster, a cluster switch unit, a first controller, and a second controller, wherein there is a one-to-one correspondence between the battery cluster, the first controller, the cluster switch unit, and a PCS in the energy storage system; The power bus of the battery cluster is connected to the DC side power bus of the PCS through the cluster switch unit; The first controller is connected to the PCS and the second controller respectively, wherein the first controller is the controller described in any one of the technical solutions of the above controller; The second controller is connected to a third controller in the energy storage system.

[0018] In one technical solution of the above battery compartment, the second controller is configured to perform the following operations: Detect whether there is a battery compartment outer ring device failure and a second controller failure; When there is a fault in the battery compartment outer ring device, sending the battery compartment outer ring device fault to the third controller; When the second controller fails, controlling the battery compartment to shut down; Among them, the battery compartment external ring equipment failure includes one or more of air conditioning failure, liquid cooler failure and dehumidifier failure.

[0019] In a fourth aspect, an energy storage system is provided, the energy storage system comprising: a battery compartment, a PCS and a third controller, wherein the battery compartment is a battery compartment as described in any one of the technical solutions of the above-mentioned battery compartments; The second controller in the battery compartment is connected to the third controller.

[0020] In a technical solution of the above energy storage system, the PCS is configured to perform the following operations: When the battery cluster is in a charging operation state, compare the current charging power extreme value with the actual charging power, and select the smaller value as the new actual charging power, wherein the current charging power extreme value is one of the first charging power extreme value, the second charging power extreme value, the third charging power extreme value, the fourth charging power extreme value and the fifth charging power extreme value; When the battery cluster is in a discharging operation state, the current discharge power extreme value is compared with the actual discharge power, and the smaller value is selected as the new actual discharge power, wherein the current discharge power extreme value is one of the first discharge power extreme value, the second discharge power extreme value, the third discharge power extreme value, the fourth discharge power extreme value and the fifth discharge power extreme value.

[0021] In the case of adopting the above technical solution, this application adopts a string-type architecture to achieve one-cluster-one-management, which improves the balance and charging and discharging efficiency of the battery cluster; adopts a single-cluster overall operation and maintenance method, and system failures can be accurately located to a single cluster, which improves the convenience of operation and maintenance. And in the design of one-cluster-one-management, a one-to-one technical solution of battery cluster, first controller, cluster switch unit, and PCS4 is adopted to improve the real-time and reliability of cluster management. At the same time, according to different levels of alarm information, different degrees of reduction in charging and discharging power extremes are adopted to achieve better temperature uniformity, and can extend battery life and improve the stability of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The disclosure of the present application will become more easily understood with reference to the accompanying drawings. It is easy for those skilled in the art to understand that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present application.

[0023] Figure 1 It is a control structure topology diagram of the energy storage system of an embodiment of the present application.

[0024] Figure 2 It is a power supply structure topology diagram of the energy storage system of an embodiment of the present application.

[0025] Figure 3 It is a schematic diagram of the main steps of the energy storage system control method of an embodiment of the present application.

[0026] Figure 4 It is a detailed step flow chart of step S3031 of an embodiment of the present application.

[0027] Figure 5 It is a detailed step flow chart of step S3031 of another embodiment of the present application.

[0028] Figure 6 It is a detailed step flow chart of step S3032 of an embodiment of the present application.

[0029] Figure 7 It is a detailed step flow chart of step S3032 of another embodiment of the present application.

[0030] Figure 8 It is a main structural diagram of a controller embodiment according to the present application. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] Those skilled in the art should understand that these implementations are only used to explain the technical principles of the present application and are not intended to limit the protection scope of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0033] First read the attached Figure 1 and Figure 2 , Figure 1 is a control structure topology diagram of the energy storage system in an embodiment of the present application, Figure 2 is a power supply structure topology diagram of the energy storage system of the embodiment of the present application, combined with Figure 1 and Figure 2 , describing an energy storage system and a battery compartment applicable to the energy storage system control method of the present application.

[0034] The energy storage system of the present application includes: one or more battery compartments 10 , one or more PCS 4 , and one or more third controllers 3 .

[0035] The battery compartment 10 includes: one or more battery clusters 7 , one or more cluster switch units 8 , one or more first controllers 1 and one second controller 2 .

[0036] The number of battery clusters 7 , the first controller 1 , the cluster switch units 8 and the PCS 4 is the same, and there is a one-to-one correspondence between the battery clusters 7 , the first controller 1 , the cluster switch units 8 and the PCS 4 .

[0037] The first controller 1 can obtain the cluster real-time information of the battery cluster 7, such as the total voltage of the battery cluster, the single cell voltage of each cell in the battery cluster, the cluster charging current, the cluster discharging current, the cluster temperature, etc. When the battery cluster 7 operates abnormally, the cluster real-time information also includes various types of operation alarm information.

[0038] The present application does not limit the manner in which the first controller 1 obtains the cluster real-time information of the battery cluster 7. As an example, when the battery cluster 7 is configured with a BMU (Battery Management Unit), the first controller 1 can communicate data with the BMU to obtain the cluster real-time information; when the battery cluster 7 is not configured with a BMU, the first controller 1 can directly communicate data with the battery management chip of each battery cell to collect battery cell information; or obtain the cluster real-time information through a temperature sensor, current sensor, resistance sensor, etc. connected to the first controller 1.

[0039] The power bus of the battery cluster 7 is connected to the DC side power bus of the PCS 4 through the cluster switch unit 8. The cluster switch unit 8 includes one or more switch devices, such as a main positive switch device and a pre-charge switch device for controlling the on and off of the positive power bus, and a main negative switch device for controlling the on and off of the negative power bus.

[0040] The type of the switch device is not limited in this application. As an example, the switch device can be a power relay, a circuit breaker, an electronic switch, etc. Those skilled in the art can select a switch device with appropriate power according to actual conditions.

[0041] The first controller 1 is connected to the PCS4 and the second controller 2 respectively. Specifically, the first controller 1 exchanges data with the PCS4 through the first communication connection, and the data includes one or more of the total voltage, total current, charge limit current, discharge limit current, charge limit voltage, discharge limit voltage, charge available power, discharge available power, single cell maximum voltage, single cell minimum voltage, single cell maximum temperature and single cell minimum temperature of the battery cluster 7 corresponding to the first controller 1. The first controller 1 also outputs a first control signal to the PCS4 through the first signal connection, and the first control signal is such as a dry contact signal, a level signal, etc.

[0042] All first controllers 1 exchange data with the second controller 2 through the third communication connection, and the data include one or more of the cell voltage, cell temperature, pole temperature, PACK voltage, battery cluster total voltage, battery cluster total current, insulation resistance, cell pressure difference, cell temperature, SOC and SOH of each battery cluster 7 corresponding to the first controller 1.

[0043] The second controller 2 exchanges data with the third controller 3 via the second communication connection, and the data includes relevant data of the battery compartment 10 corresponding to the second controller 2, such as operation alarm information, second controller failure, battery compartment outer ring equipment failure and other information.

[0044] It should be noted that the number of the third controllers 3 is less than or equal to the number of the second controllers 2 , that is, each second controller 2 may correspond to one third controller 3 , or multiple second controllers 2 may correspond to one third controller 3 .

[0045] The battery compartment 10 also includes battery compartment external ring equipment such as a dehumidifier, an air conditioner, and a liquid cooler. The second controller 2 can control the battery compartment external ring equipment and obtain the operation status of the battery compartment external ring equipment. For example, the second controller 2 exchanges data with the air conditioner 5 through the fifth communication connection, and the second controller 2 exchanges data with the dehumidifier 5 through the sixth communication connection.

[0046] The battery compartment 10 is also equipped with a high-voltage box. The first controller 1 and the cluster switch unit 8 are usually arranged in the high-voltage box. The insulation resistance is the insulation resistance of the high-voltage box body.

[0047] In the embodiment of the present application, the first controller 1 is a BCU (Battery Cluster Management Unit), the second controller 2 is a Battery Array Unit (Battery Array Unit), and the third controller 3 is an EMU (Energy Management Unit).

[0048] The specific data communication connection mode is not limited in this application. As an example, the first communication connection, the third communication connection and the fourth communication connection are CAN bus, the second communication connection is wired Ethernet, and the fifth communication connection and the sixth communication connection are RS485 bus. Those skilled in the art can select a suitable data communication connection mode according to actual conditions.

[0049] In another embodiment, there is no independent second controller 2 in the battery compartment 10, but a certain first controller 1 has both the functions of the first controller 1 and the functions of the second controller 2. As an example, the 1# first controller is both the 1# battery cluster and the BCU corresponding to the 1# PCS. At the same time, the 1# first controller can also serve as a communication host to obtain data of the 2# first controller, the n# first controller, the battery compartment outer ring equipment, etc., and has the function of a BAU. In this case, the 1# first controller is both the first controller and the second controller.

[0050] Continue reading Figure 3 , Figure 3 Schematic diagram of the main steps of the energy storage system control method of the embodiment of the present application. In the embodiment of the present application, applied to the first controller 1, the main steps of the energy storage system control method of the present application include: Step S301: obtaining the operating status of the battery cluster; Step S302: obtaining operation alarm information of the battery cluster related to the operation status of the battery cluster; Step S303: Based on the battery cluster operation status and operation alarm information, control the battery cluster operation, specifically including: Step S3031: when the battery cluster is in a charging operation state, the operation alarm information is charging operation alarm information, and based on the charging alarm level corresponding to the charging operation alarm information, the charging operation of the battery cluster is controlled; Step S3032: when the battery cluster is in a discharging operation state, the operation alarm information is discharging operation alarm information, and based on the discharge alarm level corresponding to the discharge operation alarm information, the battery cluster is controlled to perform discharging operation.

[0051] In step S301 , the first controller 1 obtains the battery cluster operating state, where the battery cluster operating state includes a charging operating state and a discharging operating state.

[0052] In step S302 , the first controller 1 periodically acquires operation alarm information related to the battery cluster operation status of the battery cluster 7 according to a preset sensor sampling cycle, data communication cycle, etc.

[0053] The types of battery cluster operation alarm information include: one or more of single cell voltage alarm information, single cell voltage difference alarm information, total voltage alarm information, cluster charging current alarm information, cluster charging battery temperature alarm information, cluster discharging current alarm information, cluster discharging battery temperature alarm information and high voltage insulation alarm information.

[0054] In step S303, the first controller 1 controls the operation of the battery cluster based on the operation alarm information. Specifically, according to different operation states of the battery cluster, the implementation method of step S303 when the battery cluster is in the charging operation state (step S3031) and the implementation method of step S303 when the battery cluster is in the discharging operation state (step S3032) are described in detail respectively.

[0055] In step S3031, when the battery cluster is in the charging operation state, the operation alarm information is the charging operation alarm information, and the types of the charging operation alarm information include: one or more of single cell voltage alarm information, single cell pressure difference alarm information, total voltage alarm information, cluster charging current alarm information, cluster charging battery temperature alarm information and high voltage insulation alarm information.

[0056] In step S3032, when the battery cluster is in the discharge operation state, the operation alarm information is the discharge operation alarm information, and the types of the discharge operation alarm information include: one or more of single cell voltage alarm information, single cell pressure difference alarm information, total voltage alarm information, cluster discharge current alarm information, cluster discharge battery temperature alarm information and high voltage insulation alarm information.

[0057] Each type of charging operation warning information and discharging operation warning information can be further divided into different levels of warning information according to a preset value range.

[0058] The highest value of all cell voltages in the battery cluster is selected as the first cell voltage of the battery cluster. The cell voltage alarm information includes, in descending order according to the value of the first cell voltage: cell voltage three levels higher, cell voltage two levels higher and cell voltage one level higher.

[0059] The lowest value of all cell voltages in the battery cluster is selected as the second cell voltage of the battery cluster. The cell voltage alarm information includes, in order from low to high values ​​of the second cell voltage: cell voltage one level low, cell voltage two levels low and cell voltage three levels low.

[0060] The difference between the highest and lowest values ​​of the voltage of all the cells in the battery cluster is calculated as the single cell pressure difference of the battery cluster. The single cell pressure difference alarm information includes the following in descending order: single cell pressure difference level 3, single cell pressure difference level 2 and single cell pressure difference level 1.

[0061] The total voltage warning information includes, in order from low to high according to the total voltage value of the battery cluster: total voltage high three levels, total voltage high two levels and total voltage high one level.

[0062] The total voltage warning information includes, in order from low to high values ​​of the total voltage of the battery cluster, the following: total voltage one level low, total voltage two levels low and total voltage three levels low.

[0063] The cluster charging current warning information includes, in order from small to large values ​​of the cluster charging current: cluster charging current large three levels, cluster charging current large two levels, and cluster charging current large one level.

[0064] The cluster charging battery temperature warning information includes: cluster charging battery temperature level one, cluster charging battery temperature level two and cluster charging battery temperature level three according to the value of cluster battery temperature during cluster charging. At this time, the lower the temperature, the greater the adverse effect on the stable operation of the battery cluster.

[0065] The cluster charging battery temperature alarm information is based on the order of the cluster battery temperature values ​​from low to high during cluster charging, and also includes: cluster charging battery temperature three levels high, cluster charging battery temperature two levels high and cluster charging battery temperature one level high. At this time, the higher the temperature, the greater the adverse effect on the stable operation of the battery cluster.

[0066] The cluster discharge current alarm information includes, in order from small to large, cluster discharge current large three levels, cluster discharge current large two levels and cluster discharge current large one level.

[0067] The cluster discharge battery temperature alarm information includes: cluster discharge battery temperature one level low, cluster discharge battery temperature two levels low and cluster discharge battery temperature three levels low according to the value of cluster battery temperature during cluster discharge, and the lower the temperature, the greater the adverse effect on the stable operation of the battery cluster.

[0068] The cluster discharge battery temperature alarm information is based on the order of the cluster battery temperature values ​​from low to high during cluster discharge, and also includes: cluster discharge battery temperature three levels high, cluster discharge battery temperature two levels high and cluster discharge battery temperature one level high. At this time, the higher the temperature, the greater the adverse effect on the stable operation of the battery cluster.

[0069] The high-voltage insulation alarm information includes: high-voltage insulation level one low, high-voltage insulation level two low, and high-voltage insulation level three low, in order from low to high according to the insulation resistance values ​​of the high-voltage box in the battery compartment.

[0070] It should be noted that, for the specific numerical ranges corresponding to the preset different levels of alarms for each type of operating alarm information, those skilled in the art can set them according to the relevant rated parameters of the battery cluster, battery cell, high-voltage box, etc., or the actual operating conditions.

[0071] As an example, for cluster charging current alarm information, based on the cluster charging rated current, the cluster charging current maximum level 3 can be set to [1.2I, 1.3I), the cluster charging current maximum level 2 can be set to [1.3I, 1.4I), and the cluster charging current maximum level 1 can be set to be greater than or equal to 1.4I, where I is the cluster charging rated current. For high-voltage insulation alarm information, according to the insulation requirements of the energy storage system for the high-voltage box, the high-voltage insulation minimum level 1 can be set to less than 900KΩ, the high-voltage insulation minimum level 2 can be set to [900KΩ, 1200KΩ), and the high-voltage insulation minimum level 3 can be set to [1200KΩ, 1500KΩ). According to actual working conditions, for the cluster discharge battery temperature alarm information, the cluster discharge battery temperature high three levels can be set to [55℃, 60℃), the cluster discharge battery temperature high two levels can be set to [60℃, 65℃), the cluster discharge battery temperature high one level can be set to greater than or equal to 65℃; the cluster discharge battery temperature low three levels can be set to [5℃, 10℃), the cluster discharge battery temperature low two levels can be set to [0℃, 5℃), and the cluster discharge battery temperature low one level can be set to less than 0℃.

[0072] Among the various types of operation alarm information mentioned above, among the same type of operation alarm information, the alarm problem corresponding to the alarm information of level one has the highest severity, the alarm problem corresponding to the alarm information of level two has the second highest severity, and the alarm problem corresponding to the alarm information of level three has the lowest severity.

[0073] Continue reading Figure 4 , combined with Figure 4The detailed implementation process of step S3031 is described. Figure 4 It is a detailed step flow chart of step S3031 of an embodiment of the present application.

[0074] For the above-mentioned charging operation alarm information of different types and levels, the charging alarm level is divided into the order from low to high according to the severity of the alarm problem. The charging alarm level information includes: charging alarm prompt, charging third-level alarm information, charging second-level alarm information and charging first-level alarm information.

[0075] The first controller 1 periodically obtains and determines the charging alarm level information of the battery cluster 7, and performs corresponding operations according to the charging operation alarm information of different levels.

[0076] When the charging operation alarm information includes any of the first-level charging alarm information, the battery cluster is controlled to shut down. The first-level charging alarm information includes: single cell voltage is one level higher, single cell voltage difference is one level higher, total voltage is one level higher, cluster charging current is one level higher, cluster charging battery temperature is one level lower, cluster charging battery temperature is one level higher and high-voltage insulation is one level lower.

[0077] Controlling the battery cluster to shut down specifically includes: the first controller 1 controls the cluster switch unit 8 to disconnect the power bus between the battery cluster 7 and the PCS 4 , and simultaneously controls the PCS 4 to shut down through the first signal connection.

[0078] When the charging operation alarm information includes any of the second-level charging alarm information, the first controller 1 sends the new charging power extreme value to the corresponding PCS 4 through the first communication connection, and controls the current charging power extreme value of the battery cluster 7 to drop to the second charging power extreme value. The second-level charging alarm information includes: single cell voltage is two levels high, single cell voltage difference is two levels high, total voltage is two levels high, cluster charging current is two levels high, cluster charging battery temperature is two levels low, cluster charging battery temperature is two levels high, and high-voltage insulation is two levels low.

[0079] When the charging operation alarm information includes any one of the three-level charging alarm information, the first controller 1 sends the new charging power extreme value to the corresponding PCS 4 through the first communication connection, and controls the current charging power extreme value of the battery cluster 7 to drop to the first charging power extreme value, and the first charging power extreme value is greater than the second charging power extreme value. The three-level charging alarm information includes: the single cell voltage is three levels high, the total voltage is three levels high, and the cluster charging current is three levels high.

[0080] When the charging alarm level only has any one or more of the charging alarm prompts, the first prompt information is sent to the user. The charging alarm prompts include: the single cell pressure difference is three levels large, the cluster rechargeable battery temperature is three levels low, the cluster rechargeable battery temperature is three levels high, and the high-voltage insulation is three levels low. The first prompt information specifically includes lighting up the first color indicator light on the battery compartment 10, such as a yellow indicator light; sending an alarm message to the user through the third controller 3, etc.

[0081] It should be noted that when there are multiple types and levels of charging operation alarm information at the same time, the charging operation alarm information with a higher severity of the alarm problem is responded to first. As an example, when there are three-level charging alarm information, two-level charging alarm information and one-level charging alarm information at the same time, the operation corresponding to the first-level charging alarm information is executed to control the battery cluster 7 to shut down; for another example, when there are three-level charging alarm information and two-level charging alarm information at the same time, the current charging power extreme value of the battery cluster 7 is controlled to drop to the second charging power extreme value.

[0082] In another embodiment, as shown in the attached Figure 5 As shown, when the charging level 3 alarm information is the current highest alarm level, the battery cluster charging operation can be controlled according to the quantity of different types of charging level 3 alarm information and / or according to the cluster charging battery temperature alarm information and the cluster charging battery temperature change trend.

[0083] The number of different types of charging level 3 warning information is counted to obtain a first cumulative number. When the first cumulative number is not 0, it is determined whether the first cumulative number is greater than or equal to a first number threshold. When the first cumulative number is greater than or equal to the first number threshold, the current charging power extreme value of the battery cluster is controlled to be reduced to a third charging power extreme value, and the third charging power extreme value is less than the first charging power extreme value and greater than or equal to the second charging power extreme value.

[0084] As an example, when the first controller 1 detects that only the single cell voltage of the battery cluster 7 is three levels higher, the first cumulative number is 1, and the first controller 1 controls the current charging power extreme value of the battery cluster 7 to be reduced to the first charging power extreme value. The first controller 1 periodically obtains and updates the charging operation alarm information. When the single cell voltage is three levels higher and the cluster charging current is three levels higher at the same time, the first cumulative number is 2. At this time, the first cumulative number is equal to the first number threshold (the value is 2), and the first controller 1 controls the current charging power extreme value of the battery cluster 7 to be further reduced from the first charging power extreme value to the third charging power extreme value.

[0085] When the charging operation alarm information includes at least one of the three levels of charging alarm information, the first cumulative number is 1 or less than the first number threshold, and the cluster rechargeable battery temperature alarm information is detected to be three levels higher than the cluster rechargeable battery temperature, the cluster rechargeable battery temperature change trend is further obtained.

[0086] When the temperature variation trend of the cluster rechargeable battery is rising, the current charging power extreme value of the battery cluster is controlled to decrease to a fifth charging power extreme value, and the fifth charging power extreme value is less than the first charging power extreme value.

[0087] As an example, after the energy storage system has been running for a period of time, when the first controller 1 detects that only a single cell voltage of the battery cluster 7 is three levels higher, the first cumulative number is 1. At this time, the first controller 1 further detects whether a cluster rechargeable battery temperature is three levels higher.

[0088] When there is no cluster charging battery whose temperature is three levels higher, the first controller 1 controls the current charging power limit of the battery cluster 7 to drop to the first charging power limit.

[0089] When the temperature of the cluster rechargeable battery is three levels higher, the first controller 1 obtains the temperature change trend of the cluster rechargeable battery, that is, determines whether the temperature change of the battery cluster between the current moment and the last charging operation alarm information update moment is a rise or a fall.

[0090] When the temperature change trend of the cluster charging battery is rising, it means that the operating condition of the battery cluster 7 is continuously deteriorating. At this time, the current charging power extreme value of the battery cluster is controlled to be reduced to the fifth charging power extreme value, and the fifth charging power extreme value is less than the first charging power extreme value, that is, by further reducing the charging power extreme value, intervention measures are taken in advance to protect the battery cluster.

[0091] It should be noted that the aforementioned technical solution of adjusting the current charging power extreme value based on the first cumulative quantity and the first quantity threshold, and the technical solution of adjusting the current charging power extreme value based on the charging three-level alarm information, the cluster charging battery temperature three high levels and the cluster charging battery temperature change trend, these two technical solutions can be used in combination or one of them can be used alone, and technical personnel in this field can set them according to actual conditions.

[0092] In the present application, strategies for reducing the charging power extreme value to different degrees are adopted according to different levels of charging operation alarm information, and the charging power extreme value of the battery cluster is controlled according to the cluster charging battery temperature and the cluster charging battery temperature change trend, thereby achieving better temperature uniformity, extending battery life, and improving the stability of the energy storage system.

[0093] In another embodiment, when the charging level 2 warning information is the highest warning level at present, the number of different types of charging level 2 warning information can be further counted to obtain a second cumulative number. When the second cumulative number is greater than or equal to the second number threshold, the current charging power extreme value of the battery cluster is controlled to be reduced to a fourth charging power extreme value, the fourth charging power extreme value is less than or equal to the second charging power extreme value, or the battery cluster is controlled to shut down.

[0094] As an example, when the first controller 1 detects that only a single cell voltage of the battery cluster 7 is two levels higher, the second accumulated number is 1, and the first controller 1 controls the current charging power limit of the battery cluster 7 to drop to the second charging power limit.

[0095] The first controller 1 periodically obtains and updates the charging operation alarm information. When the single cell voltage is two levels higher, the cluster charging current is two levels higher, and the cluster charging battery temperature is two levels higher at the same time, the second cumulative number is 3. At this time, the second cumulative number is equal to the second number threshold (the value is 3). The first controller 1 controls the current charging power extreme value of the battery cluster 7 to drop from the second charging power extreme value to the fourth charging power extreme value, or controls the battery cluster to shut down.

[0096] The specific values ​​of the first charging power extreme value, the second charging power extreme value, the third charging power extreme value, the fourth charging power extreme value, and the fifth charging power extreme value are not limited in this application. As an example, the first charging power extreme value can be set to 60% of the rated charging power of the battery cluster, the second charging power extreme value can be set to 0% of the rated charging power of the battery cluster (PCS standby), the third charging power extreme value can be set to 40% of the rated charging power of the battery cluster, the fourth charging power extreme value can be set to 0% of the rated charging power of the battery cluster, and the fifth charging power extreme value can be set to 30% of the rated charging power of the battery cluster. Those skilled in the art can set the appropriate current charging power extreme value according to actual conditions.

[0097] It should be noted that setting the current charging power extreme value to 0% of the rated charging power of the battery cluster and shutting down the battery cluster are two different controls. After the current charging power extreme value is set to 0% of the rated charging power of the battery cluster, when the alarm information that triggers the setting of 0% of the rated charging power of the battery cluster disappears, the battery cluster can automatically resume charging after resetting the current discharge power extreme value. After the battery cluster is shut down, the battery cluster will not be able to resume operation automatically, and manual intervention operations such as manual button reset and command reset are required to resume operation. By distinguishing the stopping working modes of the battery cluster corresponding to the alarm information of different severity as described above, the energy storage system can be controlled more accurately, which ensures the safety of the equipment and improves the user experience.

[0098] After receiving the current charging power extreme value sent by the first controller 1, PCS4 compares the current charging power extreme value with the actual charging power, and selects the smaller value as the new actual charging power. PCS operates according to the charging power with the smaller value, which can avoid further deterioration of the operating condition of the battery cluster, or slow down the rate of deterioration of the operating condition of the battery cluster, buy time for users to take countermeasures, adjust the operation of the outer ring equipment, etc., and improve the safety of the equipment. The current charging power extreme value is one of the first charging power extreme value, the second charging power extreme value, the third charging power extreme value, the fourth charging power extreme value, and the fifth charging power extreme value.

[0099] Continue reading Figure 6 , combined with Figure 6 The detailed implementation process of step S3032 is described. Figure 6 It is a detailed step flow chart of step S3032 of an embodiment of the present application.

[0100] For the above-mentioned discharge operation alarm information of different types and levels, the discharge alarm levels are included in order from low to high according to the severity of the alarm problem: discharge alarm prompt, discharge level 3 alarm information, discharge level 2 alarm information and discharge level 1 alarm information.

[0101] The first controller 1 periodically obtains and determines the discharge warning level of the battery cluster 7, and performs corresponding operations according to different discharge warning levels.

[0102] When the discharge alarm level has any of the first-level discharge alarm information, the battery cluster 7 is controlled to shut down. The first-level discharge alarm information includes: single cell voltage is one level lower, single cell voltage difference is one level higher, total voltage is one level lower, cluster discharge current is one level higher, cluster discharge battery temperature is one level lower, cluster discharge battery temperature is one level higher, and high-voltage insulation is one level lower.

[0103] Controlling the battery cluster 7 to shut down specifically includes: the first controller 1 controls the cluster switch unit 8 to disconnect the power bus between the battery cluster 7 and the PCS 4 , and simultaneously controls the PCS 4 to shut down through the first signal connection.

[0104] When the discharge alarm level has any of the discharge level 2 alarm information, the first controller 1 sends the new power extreme value to the corresponding PCS 4 through the first communication connection, and controls the current discharge power extreme value of the battery cluster 7 to decrease to the second discharge power extreme value. The discharge level 2 alarm information includes: single cell voltage is low level 2, single cell pressure difference is high level 2, total voltage is low level 2, cluster discharge current is high level 2, cluster discharge battery temperature is low level 2, cluster discharge battery temperature is high level 2, and high voltage insulation is low level 2.

[0105] When the discharge alarm level has any of the three discharge alarm information, the first controller 1 sends the new power extreme value to the corresponding PCS 4 through the first communication connection, controls the current discharge power extreme value of the battery cluster 7 to drop to the first discharge power extreme value, and the first discharge power extreme value is greater than the second discharge power extreme value. The three discharge alarm information includes: the single cell voltage is three levels low, the total voltage is three levels low, and the cluster discharge current is three levels high.

[0106] When the discharge alarm level only has any one of the discharge alarm prompts, the first prompt information is sent to the user. The discharge alarm prompts include: the single cell pressure difference is three levels large, the cluster discharge battery temperature is three levels low, the cluster discharge battery temperature is three levels high, and the high-voltage insulation is three levels low. The first prompt information includes lighting up the first color indicator light on the battery compartment 10, such as a yellow indicator light; sending an alarm message to the user through the third controller 3, for example, through voice prompting, the voice content is "cluster discharge battery temperature is three levels high"; and / or prompting through the display screen, popping up an alarm message box to display "cluster discharge battery temperature is three levels high".

[0107] It should be noted that when there are multiple types and levels of discharge operation alarm information at the same time, the discharge alarm level with a higher severity will be responded to first. For example, when there are three-level discharge alarm information, two-level discharge alarm information and one-level discharge alarm information at the same time, the operation corresponding to the first-level charge alarm information is performed to control the battery cluster to shut down; for another example, when there are three-level discharge alarm information and two-level discharge alarm information at the same time, the current discharge power extreme value of the battery cluster 7 is controlled to drop to the second discharge power extreme value.

[0108] In another embodiment, as shown in the attached Figure 7 As shown, when the discharge level 3 alarm information is the current highest alarm level, the battery cluster discharge operation can be controlled according to the quantity of different types of discharge level 3 alarm information and / or according to the cluster discharge battery temperature alarm information and the cluster discharge battery temperature change trend.

[0109] Specifically, the number of different types of discharge level 3 warning information is counted to obtain a third cumulative number. When the third cumulative number is not 0, it is determined whether the third cumulative number is greater than or equal to a third number threshold. When the third number threshold is greater than or equal to the third number threshold, the current discharge power extreme value of the battery cluster is controlled to be reduced to a third discharge power extreme value, and the third discharge power extreme value is less than the first discharge power extreme value and greater than or equal to the second discharge power extreme value.

[0110] As an example, when the first controller 1 detects that only the single cell voltage of the battery cluster 7 is three levels higher, the third cumulative number is 1, and the first controller 1 controls the current discharge power extreme value of the battery cluster 7 to be reduced to the first discharge power extreme value. The first controller 1 periodically obtains and updates the discharge operation alarm information. When the single cell voltage is three levels higher and the cluster discharge current is three levels higher at the same time, the third cumulative number is 2. At this time, the third cumulative number is equal to the third number threshold (the value is 2), and the first controller 1 controls the current discharge power extreme value of the battery cluster 7 to be further reduced from the first discharge power extreme value to the third discharge power extreme value.

[0111] When the discharge operation alarm information includes at least one of the three levels of discharge alarm information, the third accumulated number is 1 or less than the third number threshold, and the cluster discharge battery temperature alarm information is detected to be three levels higher than the cluster discharge battery temperature, the cluster discharge battery temperature change trend is further obtained.

[0112] When the temperature variation trend of the cluster discharge battery is rising, the current discharge power extreme value of the battery cluster is controlled to decrease to a fifth discharge power extreme value, and the fifth discharge power extreme value is less than the first discharge power extreme value.

[0113] As an example, after the energy storage system has been running for a period of time, when the first controller 1 detects that only a single cell voltage of the battery cluster 7 is three levels higher, the third cumulative number is 1. At this time, the first controller 1 further detects whether a cluster discharge battery temperature is three levels higher.

[0114] When there is no cluster discharge battery temperature that is three levels higher, the first controller 1 controls the current discharge power limit of the battery cluster 7 to drop to the first discharge power limit.

[0115] When the cluster discharge battery temperature is three levels higher, the first controller 1 obtains the cluster discharge battery temperature change trend, that is, determines whether the battery cluster temperature change between the current moment and the previous discharge operation alarm information update moment is a rise or a fall.

[0116] When the temperature change trend of the cluster discharge battery is rising, it means that the operating condition of the battery cluster 7 is continuously deteriorating. At this time, the current discharge power extreme value of the battery cluster is controlled to be reduced to the fifth discharge power extreme value, and the fifth discharge power extreme value is less than the first discharge power extreme value, that is, intervention measures are taken in advance to protect the battery cluster by further reducing the discharge power extreme value.

[0117] In the present application, strategies for reducing the discharge power extreme value to different degrees are adopted according to the discharge operation alarm information of different levels, and the discharge power extreme value of the battery cluster is controlled according to the cluster discharge battery temperature and the cluster discharge battery temperature change trend, thereby achieving better temperature uniformity, extending the battery life, and improving the stability of the energy storage system.

[0118] It should be noted that the aforementioned technical solution of adjusting the current discharge power extreme value based on the third cumulative quantity and the third quantity threshold, and the technical solution of adjusting the current discharge power extreme value based on the discharge three-level alarm information, the cluster discharge battery temperature three levels high and the cluster discharge battery temperature change trend, these two technical solutions can be used in combination or one of them can be used alone, and those skilled in the art can set them according to actual conditions.

[0119] In another embodiment, when the discharge level 2 alarm information is the highest alarm level at present, the number of different types of discharge level 2 alarm information can be further counted to obtain a fourth cumulative number. When the fourth cumulative number is greater than or equal to the fourth number threshold, the current discharge power extreme value of the battery cluster is controlled to be reduced to the fourth discharge power extreme value, the fourth discharge power extreme value is less than or equal to the second discharge power extreme value, or the battery cluster is controlled to shut down.

[0120] As an example, when the first controller 1 detects that only a single cell voltage of the battery cluster 7 is two levels higher, the fourth accumulated number is 1, and the first controller 1 controls the current discharge power limit of the battery cluster 7 to drop to the second discharge power limit.

[0121] The first controller 1 periodically obtains and updates the discharge operation alarm information. When the single cell voltage is two levels higher, the cluster discharge current is two levels higher, and the cluster discharge battery temperature is two levels higher, the fourth cumulative number is 3. At this time, the fourth cumulative number is equal to the fourth number threshold (the value is 3). The first controller 1 controls the current discharge power extreme value of the battery cluster 7 to drop from the second discharge power extreme value to the fourth discharge power extreme value, or controls the battery cluster to shut down.

[0122] The specific values ​​of the first discharge power extreme value, the second discharge power extreme value, the third discharge power extreme value, the fourth discharge power extreme value, and the fifth discharge power extreme value are not limited in this application. As an example, the first discharge power extreme value can be set to 60% of the rated discharge power of the battery cluster, the second discharge power extreme value can be set to 0% of the rated discharge power of the battery cluster (PCS standby), the third discharge power extreme value can be set to 40% of the rated discharge power of the battery cluster, the fourth discharge power extreme value can be set to 0% of the rated discharge power of the battery cluster, and the fifth discharge power extreme value can be set to 30% of the rated discharge power of the battery cluster. Those skilled in the art can set the appropriate current discharge power extreme value according to actual conditions.

[0123] It should be noted that the current discharge power extreme value can be set to 0% of the rated discharge power of the battery cluster and the battery cluster shutdown are two different controls. After the current discharge power extreme value is set to 0% of the rated discharge power of the battery cluster, when the alarm information that triggers the setting of 0% of the rated discharge power of the battery cluster disappears, the battery cluster can automatically resume discharge after resetting the current discharge power extreme value. After the battery cluster is shut down, the battery cluster will not be able to resume operation automatically, and manual intervention operations such as manual button reset and command reset are required to resume operation. By distinguishing the stopping battery cluster working methods corresponding to alarm information of different severity as described above, the energy storage system can be controlled more accurately, which ensures equipment safety and improves user experience.

[0124] After receiving the current discharge power extreme value sent by the first controller 1, PCS4 compares the current discharge power extreme value with the actual discharge power, and selects the smaller value as the new actual discharge power. PCS operates according to the discharge power with the smaller value, which can avoid further deterioration of the operating condition of the battery cluster, or slow down the rate of deterioration of the operating condition of the battery cluster, buy time for the user to take countermeasures, adjust the operation of the outer ring equipment, etc., and improve the safety of the equipment. The current discharge power extreme value is one of the first discharge power extreme value, the second discharge power extreme value, the third discharge power extreme value, the fourth discharge power extreme value, and the fifth discharge power extreme value.

[0125] In the embodiment of the present application, the second controller 2 simultaneously detects the battery compartment outer ring equipment failure and the second controller failure in real time.

[0126] When there is a battery compartment outer ring equipment failure, the battery compartment outer ring equipment failure is sent to the third controller 3 through the second communication connection. The battery compartment outer ring equipment failure includes one or more of air conditioning failure, liquid cooler failure, and dehumidifier failure.

[0127] When there is a second controller failure, the battery compartment is controlled to shut down. Controlling the battery compartment to shut down includes notifying the third controller 3 through the second signal connection that the battery compartment 10 where the second controller failure occurs needs to shut down. The third controller 3 controls all PCSs corresponding to all battery clusters in the battery compartment to shut down through the fourth communication connection, and notifies the PCS that executes the shutdown to control all cluster switch units corresponding to all battery clusters in the battery compartment to disconnect. The second controller failure includes a communication failure between the second controller and the first controller, a data storage failure of the second controller, etc.

[0128] During the use of the energy storage system, each time it is restarted, for the BAU and BCU of the battery management system BMS (Battery Management System), the BAU will check whether there is an unhandled second controller fault, and the BCU will check whether there is an unhandled charging level 1 alarm information or discharging level 1 alarm information.

[0129] When there is an unhandled second controller fault on the BAU, the battery compartment corresponding to the second controller will not be allowed to connect to the energy storage system. When there is an unhandled first-level charging alarm or first-level discharging alarm on the BCU, the battery cluster corresponding to the BCU will not be allowed to connect to the battery compartment, and the BAU and BCU will light up the corresponding second color indicator on the battery compartment, such as a red indicator.

[0130] When there is no unhandled second controller fault in the BAU, the battery compartment corresponding to the second controller is allowed to access the energy storage system; when there is no unhandled charging level 1 alarm information or discharging level 1 alarm information in the BCU, the battery cluster corresponding to the BCU will be allowed to access the battery compartment and be charged or discharged through its corresponding PCS. At the same time, the BAU and BCU light up the corresponding third color indicator light on the battery compartment, such as the green indicator light.

[0131] At this time, the current charging power extreme value of the PCS is the rated charging power of the battery cluster, and the current discharging power extreme value is the rated discharging power of the battery cluster. The actual charging power and the actual discharging power are the charging power and discharging power allocated to each PCS by the EMS (Energy Management System) in the energy storage system according to power demand, parameters of each battery compartment, parameters of each battery cluster, etc.

[0132] In this application, a string-type architecture is adopted to achieve one cluster one management, which improves the balance and charging and discharging efficiency of the battery cluster. At the same time, a single cluster overall operation and maintenance method is adopted, and system failures can be accurately located in a single cluster, which improves the convenience of operation and maintenance. In the design of one cluster one management, a technical solution of one-to-one correspondence between the battery cluster, the first controller, the cluster switch unit and the PCS4 is adopted, which improves the real-time and reliability of cluster management.

[0133] Furthermore, it can be seen from the above embodiments that in the operations of controlling the shutdown of the battery compartment and the shutdown of the battery cluster, a dual control method of disconnecting the cluster switch unit 8 and the PCS4 is used. The dual control method can prevent the failure of the switch device in the cluster switch unit 8 and the inability to disconnect the power bus, causing the PCS4 to continue to operate according to the previously set power parameters, resulting in overcharging or over-discharging, which damages the battery and may affect the normal operation of other battery clusters or battery compartments, thereby improving the reliability and safety of the energy storage system. At the same time, the transmission of severe fault information is made more direct and reliable through the transmission of physical signals such as dry contacts and levels of the first signal connection or the second signal connection.

[0134] Furthermore, the present application also provides a controller, Figure 8 is a schematic diagram of the main structure of a controller embodiment according to the present application. Figure 8As shown, the controller in the embodiment of the present application mainly includes a storage device 81 and a processor 82. The storage device 81 can be configured to store a program for executing the energy storage system control method of the above method embodiment, and the processor 82 can be configured to execute the program in the storage device, which includes but is not limited to the program for executing the energy storage system control method of the above method embodiment. For ease of explanation, only the parts related to the embodiment of the present application are shown. For specific technical details not disclosed, please refer to the method part of the embodiment of the present application. As an example, the controller is a BCU in the battery compartment.

[0135] Those skilled in the art should be able to appreciate that the method steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of electronic hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in electronic hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0136] It should be noted that the terms "first", "second", "third", "fourth", etc. in the specification and claims of the present invention and the above-mentioned drawings are only used to distinguish similar objects, rather than to describe or indicate a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0137] In addition, in the description of the present application, the term "A and / or B" represents all possible combinations of A and B, such as only A, only B, or A and B.

[0138] So far, the technical solutions of the present application have been described in conjunction with the embodiments shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A method for controlling an energy storage system, wherein the energy storage system comprises at least one battery compartment, and the battery compartment comprises at least one battery cluster, characterized in that: The battery clusters correspond one-to-one to the PCSs in the energy storage system, and the method includes: Acquiring a battery cluster operating state, wherein the battery cluster operating state includes a charging operating state and a discharging operating state; Acquiring operation alarm information of the battery cluster related to the operation state of the battery cluster; Based on the battery cluster operating state and the operating alarm information, the battery cluster operation is controlled.

2. The energy storage system control method according to claim 1, characterized in that: The acquiring of the operation alarm information of the battery cluster related to the operation state of the battery cluster comprises: When the battery cluster operation state is the charging operation state, acquiring charging operation alarm information of the battery cluster, wherein the charging operation alarm information includes one or more of single cell voltage alarm information, single cell pressure difference alarm information, total voltage alarm information, cluster charging current alarm information, cluster charging battery temperature alarm information and high voltage insulation alarm information; The controlling the operation of the battery cluster based on the operation state of the battery cluster and the operation alarm information includes: Based on the charging alarm level corresponding to the charging operation alarm information, the charging operation of the battery cluster is controlled.

3. The energy storage system control method according to claim 1, characterized in that: The acquiring of the operation alarm information of the battery cluster related to the operation state of the battery cluster comprises: When the battery cluster operation state is a discharge operation state, obtaining discharge operation alarm information of the battery cluster, wherein the discharge operation alarm information includes one or more of single cell voltage alarm information, single cell pressure difference alarm information, total voltage alarm information, cluster discharge current alarm information, cluster discharge battery temperature alarm information and high voltage insulation alarm information; The controlling the operation of the battery cluster based on the operation state of the battery cluster and the operation alarm information includes: Based on the discharge warning level corresponding to the discharge operation warning information, the discharge operation of the battery cluster is controlled.

4. The energy storage system control method according to claim 2, characterized in that: The monomer voltage alarm information includes: monomer voltage is three levels higher, monomer voltage is two levels higher and monomer voltage is one level higher; The monomer pressure difference alarm information includes: monomer pressure difference greater than level 2 and monomer pressure difference greater than level 1; The total voltage alarm information includes: total voltage three levels higher, total voltage two levels higher and total voltage one level higher; The cluster charging current alarm information includes: cluster charging current three levels high, cluster charging current two levels high and cluster charging current one level high; The cluster rechargeable battery temperature alarm information includes: cluster rechargeable battery temperature is two levels low, cluster rechargeable battery temperature is one level low, cluster rechargeable battery temperature is two levels high, and cluster rechargeable battery temperature is one level high; The high-voltage insulation alarm information includes: high-voltage insulation low level 2 and high-voltage insulation low level 1. The controlling the charging operation of the battery cluster based on the charging alarm level corresponding to the charging operation alarm information includes: When the charging operation alarm information is any one of the three-level charging alarm information, controlling the current charging power extreme value of the battery cluster to drop to the first charging power extreme value, wherein the three-level charging alarm information includes: the single cell voltage is three levels higher, the total voltage is three levels higher, and the cluster charging current is three levels higher; When the charging operation alarm information is any one of the second-level charging alarm information, the current charging power extreme value of the battery cluster is controlled to be reduced to the second charging power extreme value, wherein the second charging power extreme value is less than the first charging power extreme value, and the first charging power extreme value is less than the rated charging power of the battery cluster, and wherein the second-level charging alarm information includes: the single cell voltage is two levels higher, the single cell voltage difference is two levels higher, the total voltage is two levels higher, the cluster charging current is two levels higher, the cluster charging battery temperature is two levels lower, the cluster charging battery temperature is two levels higher, and the high-voltage insulation is two levels lower; When the charging operation alarm information includes any one of the first-level charging alarm information, the battery cluster is controlled to shut down, wherein the first-level charging alarm information includes: the single cell voltage is one level higher, the single cell voltage difference is one level higher, the total voltage is one level higher, the cluster charging current is one level higher, the cluster charging battery temperature is one level lower, the cluster charging battery temperature is one level higher and the high-voltage insulation is one level lower.

5. The energy storage system control method according to claim 4, characterized in that: The controlling the charging operation of the battery cluster based on the charging alarm level corresponding to the charging operation alarm information further includes: Counting different types of charging level 3 warning information to obtain a first cumulative number; When the first accumulated number is greater than or equal to a first number threshold, controlling the current charging power limit of the battery cluster to decrease to a third charging power limit, wherein the third charging power limit is less than the first charging power limit; Counting different types of charging level 2 warning information to obtain a second cumulative number; When the second accumulated number is greater than or equal to a second number threshold, the battery cluster is controlled to shut down, or the current charging power extreme value of the battery cluster is controlled to drop to a fourth charging power extreme value, wherein the fourth charging power extreme value is less than or equal to the second charging power extreme value.

6. The energy storage system control method according to claim 4, characterized in that: The cluster rechargeable battery temperature warning information also includes a cluster rechargeable battery temperature three levels higher, The controlling the charging operation of the battery cluster based on the charging alarm level corresponding to the charging operation alarm information further includes: When the charging operation alarm information is at least one of the three levels of charging alarm information, and the cluster rechargeable battery temperature alarm information is that the cluster rechargeable battery temperature is three levels higher, obtaining a cluster rechargeable battery temperature change trend; When the temperature variation trend of the cluster rechargeable battery is rising, the current charging power limit of the battery cluster is controlled to decrease to a fifth charging power limit, wherein the fifth charging power limit is less than the first charging power limit.

7. The energy storage system control method according to claim 3, characterized in that: The cell voltage warning information includes: cell voltage is low level 3, cell voltage is low level 2, and cell voltage is low level 1. The monomer pressure difference alarm information includes: monomer pressure difference greater than level 2 and monomer pressure difference greater than level 1. The total voltage alarm information includes: total voltage is three levels low, total voltage is two levels low and total voltage is one level low. The cluster discharge current alarm information includes: cluster discharge current three levels high, cluster discharge current two levels high and cluster discharge current one level high. The cluster discharge battery temperature alarm information includes: cluster discharge battery temperature low level 2, cluster discharge battery temperature low level 1, cluster discharge battery temperature high level 2, and cluster discharge battery temperature high level 1. The high-voltage insulation alarm information includes: high-voltage insulation low level 2 and high-voltage insulation low level 1. The controlling the battery cluster to discharge based on the discharge warning level corresponding to the discharge operation warning information includes: When the discharge operation alarm information is any one of the three-level discharge alarm information, controlling the current discharge power extreme value of the battery cluster to drop to the first discharge power extreme value, wherein the three-level discharge alarm information includes: the single cell voltage is three levels lower, the total voltage is three levels lower, and the cluster discharge current is three levels higher; When the discharge operation alarm information includes any one of the discharge level 2 alarm information, the current discharge power extreme value of the battery cluster is controlled to be reduced to the second discharge power extreme value, wherein the second discharge power extreme value is less than the first discharge power extreme value, the first discharge power extreme value is less than the rated discharge power of the battery cluster, and wherein the discharge level 2 alarm information includes: the single cell voltage is two levels lower, the single cell voltage difference is two levels higher, the total voltage is two levels lower, the cluster discharge current is two levels higher, the cluster discharge battery temperature is two levels lower, the cluster discharge battery temperature is two levels higher, and the high voltage insulation is two levels lower; When the discharge operation alarm information includes any one of the first-level discharge alarm information, the battery cluster is controlled to shut down, wherein the first-level discharge alarm information includes: the single cell voltage is one level lower, the single cell voltage difference is one level higher, the total voltage is one level lower, the cluster discharge current is one level higher, the cluster discharge battery temperature is one level lower, the cluster discharge battery temperature is one level higher and the high-voltage insulation is one level lower.

8. The energy storage system control method according to claim 7, characterized in that: The controlling the battery cluster to discharge based on the discharge alarm level corresponding to the discharge alarm information further includes: Counting different types of the third-level discharge warning information to obtain a third cumulative number; When the third accumulated number is greater than or equal to a third number threshold, controlling the current discharge power limit of the battery cluster to decrease to a third discharge power limit, wherein the third discharge power limit is less than the first discharge power limit; Counting different types of discharge level 2 warning information to obtain a fourth cumulative number; When the fourth accumulated number is greater than or equal to a fourth number threshold, the battery cluster is controlled to shut down, or the current discharge power limit of the battery cluster is controlled to drop to a fourth discharge power limit, wherein the fourth discharge power limit is less than or equal to the second discharge power limit.

9. The energy storage system control method according to claim 7, characterized in that: The cluster discharge battery temperature alarm information also includes a cluster discharge battery temperature three levels higher, The controlling the battery cluster to discharge based on the discharge alarm level corresponding to the discharge alarm information further includes: When the discharge operation alarm information includes at least one of the three levels of discharge alarm information, and the cluster discharge battery temperature alarm information indicates that the cluster discharge battery temperature is three levels higher, obtaining a cluster discharge battery temperature change trend; When the temperature variation trend of the cluster discharge battery is rising, the current discharge power limit of the battery cluster is controlled to drop to a fifth discharge power limit, wherein the fifth discharge power limit is smaller than the first discharge power limit.

10. The energy storage system control method according to any one of claims 1 to 9, characterized in that: Single cell pressure difference alarm information includes: Single cell pressure difference is three levels large, The cluster charging battery temperature warning information includes: cluster charging battery temperature low three levels and cluster charging battery temperature high three levels. The cluster discharge battery temperature warning information includes: cluster discharge battery temperature low three levels and cluster discharge battery temperature high three levels. High voltage insulation warning information includes: high voltage insulation low level three, The method further comprises: When the operation alarm information includes any one of the following: the single cell pressure difference is three levels greater, the cluster charging battery temperature is three levels lower, the cluster charging battery temperature is three levels higher, the cluster discharging battery temperature is three levels lower, the cluster discharging battery temperature is three levels higher, and the high-voltage insulation is three levels lower, a first prompt information is sent to the user.

11. A controller, comprising a processor and a storage device, characterized in that: The storage device is suitable for storing a plurality of program codes, and the program codes are suitable for being loaded and run by the processor to execute the energy storage system control method according to any one of claims 1 to 10.

12. A battery compartment, applied to an energy storage system, characterized in that: The battery compartment includes a battery cluster, a cluster switch unit, a first controller, and a second controller, wherein the battery cluster, the first controller, the cluster switch unit, and the PCS in the energy storage system have a one-to-one correspondence; The power bus of the battery cluster is connected to the DC side power bus of the PCS through the cluster switch unit; The first controller is connected to the PCS and the second controller respectively, wherein the first controller is the controller according to claim 11; The second controller is connected to a third controller in the energy storage system.

13. The battery compartment according to claim 12, characterized in that: The second controller is configured to perform the following operations: Detect whether there is a battery compartment outer ring device failure and a second controller failure; When there is a fault in the battery compartment outer ring device, sending the battery compartment outer ring device fault to the third controller; When the second controller fails, controlling the battery compartment to shut down; Among them, the battery compartment external ring equipment failure includes one or more of air conditioning failure, liquid cooler failure and dehumidifier failure.

14. An energy storage system, characterized in that: The energy storage system comprises: a battery compartment, a PCS and a third controller, wherein the battery compartment is the battery compartment according to claim 12 or claim 13; The second controller in the battery compartment is connected to the third controller.

15. The energy storage system according to claim 14, characterized in that: The PCS is configured to perform the following operations: When the battery cluster is in a charging operation state, compare the current charging power extreme value with the actual charging power, and select the smaller value as the new actual charging power, wherein the current charging power extreme value is one of the first charging power extreme value, the second charging power extreme value, the third charging power extreme value, the fourth charging power extreme value and the fifth charging power extreme value; When the battery cluster is in a discharging operation state, the current discharge power extreme value is compared with the actual discharge power, and the smaller value is selected as the new actual discharge power, wherein the current discharge power extreme value is one of the first discharge power extreme value, the second discharge power extreme value, the third discharge power extreme value, the fourth discharge power extreme value and the fifth discharge power extreme value.

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