Charging and discharging control method, electronic equipment and storage medium

Abstract

The embodiment of the invention discloses a charging and discharging control method based on a battery energy storage system, electronic equipment and a storage medium, and the method comprises the steps: detecting whether each battery cluster meets a power-on condition or not according to the voltage of each battery cluster in the battery energy storage system and the bus voltage; if each battery cluster meets the power-on condition, performing pre-charging power-on on each battery cluster according to a pre-charging power-on instruction; charging the pre-charged and electrified battery cluster, and detecting whether a battery cell of the battery cluster meets a full charge condition or not; when the battery cells of the battery clusters meet the full charging condition, the charging proportion parameter of each battery cluster is adjusted to the preset value, charging and discharging of the battery cells can be accurately controlled, the service life of the battery cells is prolonged, and the battery energy storage system can operate more efficiently and safely.

Description

Technical Field

[0001] The present application relates to the field of battery charging technology, and in particular to a charging and discharging control method, electronic equipment and storage medium based on a battery energy storage system. Background Art

[0002] The current charge and discharge control methods are mainly as follows: One is to construct a multivariate logistic regression relationship model based on the relationship between the voltage, circuit, SOC, temperature, and output power during the battery pack charging / discharging process. During the actual operation of the battery pack, the real-time collected values ​​are substituted into the relationship model for calculation, thereby realizing the management and control of the battery pack. The other is at the lithium-ion battery pack level. During the charging and discharging process, the SOC interval of the current battery internal resistance is determined according to the different initial SOC states of the lithium-ion battery pack, and the corresponding charge / discharge current threshold is calculated based on the battery internal resistance change model with SOC, and the current is dynamically adjusted according to the SOC change during the charging / discharging process. However, using the regression relationship model as a reference will result in a large estimation error, which is not conducive to the BMS's precise control of the charging and discharging process of the battery cell.

[0003] However, although the above method can achieve the management and control of the battery pack, it has a large estimation error, which is not conducive to the BMS to accurately control the charging and discharging process of the battery cell. Summary of the invention

[0004] The embodiments of the present application provide a charge and discharge control method, an electronic device, and a storage medium based on a battery energy storage system, which can accurately control the charge and discharge of battery cells, extend the service life of the battery cells, and enable the battery energy storage system to operate more efficiently and safely.

[0005] The present application provides a charge and discharge control method based on a battery energy storage system, including:

[0006] According to the voltage of each battery cluster and the bus voltage in the battery energy storage system, detecting whether each battery cluster meets the power-on condition;

[0007] If each of the battery clusters meets the power-on condition, pre-charging and powering up each of the battery clusters according to the pre-charging and powering up instruction;

[0008] Charging the pre-charged battery cluster and detecting whether the cells of the battery cluster meet the full charging condition;

[0009] When the cells of the battery cluster meet the full charge condition, the charging ratio parameter of each battery cluster is adjusted to a preset value.

[0010] Optionally, in some embodiments of the present application, detecting whether each battery cluster meets the power-on condition according to the voltage of each battery cluster and the bus voltage in the battery energy storage system includes:

[0011] Determining in the battery energy storage system that the battery cluster with the lowest voltage is the first battery cluster;

[0012] Determining in the battery energy storage system a second battery cluster with the lowest voltage other than the first battery cluster;

[0013] calculating a difference between a voltage of the second battery cluster and a bus voltage;

[0014] When the difference between the voltage of the second battery cluster and the bus voltage is less than the first voltage value, it is determined that the battery cluster meets the power-on condition.

[0015] Optionally, in some embodiments of the present application, if each battery cluster meets the power-on condition, pre-charging and powering up each battery cluster according to the pre-charging and powering up instruction includes:

[0016] If each of the battery clusters meets the power-on condition, detecting whether the difference between the voltage of the battery cluster and the bus voltage is less than a second voltage value;

[0017] If the difference between the battery cluster and the bus voltage is less than or equal to the second voltage value, the positive relay is closed, and the pre-charge relay is disconnected within a preset time to complete the pre-charge power-up of the battery cluster.

[0018] Optionally, in some embodiments of the present application, it further includes:

[0019] If the difference between the voltage of the battery cluster and the bus voltage is greater than a second voltage value, detecting whether the pre-charging time of the battery cluster is greater than a preset time;

[0020] If the pre-charging time of the battery cluster is greater than the preset time, the pre-charging relay and the main negative relay are disconnected, and all battery clusters are controlled to be powered off.

[0021] Optionally, in some embodiments of the present application, when the battery cells of the battery cluster meet the full charge condition, adjusting the charging ratio parameter of each battery cluster to a preset value includes:

[0022] If the single cell voltage of the battery cell in the battery cluster reaches a first preset voltage and lasts longer than the preset voltage, the charging ratio parameter of each battery cluster is adjusted to a preset value.

[0023] Optionally, in some embodiments of the present application, it further includes:

[0024] When the pre-charged battery cluster is charged with a constant current, detecting whether the single cell voltage of the battery cell in the battery cluster is greater than a second preset voltage;

[0025] If the single cell voltage of the battery cell in the battery cluster is greater than the second preset voltage, the battery cluster is charged with reduced current;

[0026] Detecting whether the charging current of the battery cluster during the step-down charging process is less than or equal to the minimum charging current corresponding to the step-down charging process;

[0027] If the charging current of the battery cluster during the step-down charging process is less than or equal to the minimum charging current corresponding to the step-down charging process, the battery cluster is charged based on the minimum charging current.

[0028] Optionally, in some embodiments of the present application, it further includes:

[0029] If the charging current of the battery cluster is greater than the minimum charging current corresponding to the charging process during the step-down charging process, charging is performed at the minimum current after a preset delay.

[0030] Correspondingly, the present application also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the steps of any of the above methods when executing the program.

[0031] The present application also provides a computer-readable storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by a processor, the steps of any of the above methods are implemented.

[0032] The embodiment of the present application provides a charge and discharge control method, electronic device and storage medium based on a battery energy storage system. According to the voltage of each battery cluster in the battery energy storage system and the bus voltage, it is detected whether each battery cluster meets the power-on condition. If each battery cluster meets the power-on condition, each battery cluster is pre-charged and powered on according to the pre-charge power-on instruction. Then, the pre-charged battery cluster is charged, and it is detected whether the battery cells of the battery cluster meet the full charge condition. When the battery cells of the battery cluster meet the full charge condition, the charging ratio parameters of each battery cluster are adjusted to a preset value. The charge and discharge control scheme based on the battery energy storage system provided by the present application pre-charges and powers on the battery cluster according to the voltage of each battery cluster in the battery energy storage system and the bus voltage to avoid direct charging causing excessive charging current to affect charging safety. Subsequently, the pre-charged battery cluster is charged, and when the battery cells of the battery cluster meet the full charge condition, the charging ratio parameters of each battery cluster are adjusted to a preset value. Thus, the charging and discharging of the battery cells can be accurately controlled, the service life of the battery cells is extended, and the battery energy storage system can be operated more efficiently and safely. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 It is a flow chart of a charge and discharge control method based on a battery energy storage system provided in an embodiment of the present application;

[0035] Figure 2 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0037] The embodiments of the present application provide a charge and discharge control method, an electronic device, and a storage medium based on a battery energy storage system.

[0038] Among them, the charging and discharging control method based on the battery energy storage system can be specifically applied in a server or a terminal. The server can include an independently operated server or a distributed server, or a server cluster composed of multiple servers. The terminal can include a tablet computer or a personal computer (PC, Personal Computer).

[0039] It should be noted that the order of description of the following embodiments is not intended to limit the priority order of the embodiments.

[0040] A charge and discharge control method based on a battery energy storage system comprises: detecting whether each battery cluster meets a power-on condition according to the voltage of each battery cluster in the battery energy storage system and the bus voltage; if each battery cluster meets the power-on condition, pre-charging and powering up each battery cluster according to a pre-charging and powering-up instruction; charging the pre-charged battery cluster and detecting whether the battery cells of the battery cluster meet a full-charge condition; and adjusting the charging ratio parameters of each battery cluster to a preset value when the battery cells of the battery cluster meet the full-charge condition.

[0041] See also Figure 1 , Figure 1A schematic diagram of a flow chart of a charge and discharge control method based on a battery energy storage system provided in an embodiment of the present application. The specific flow chart of the charge and discharge control method based on a battery energy storage system may be as follows:

[0042] 101. According to the voltage of each battery cluster and the bus voltage in the battery energy storage system, detect whether each battery cluster meets the power-on condition.

[0043] The battery energy storage system is a real-time monitoring system composed of electronic circuit equipment, also known as the battery management system (BMS), which is responsible for monitoring and managing the battery energy storage unit to ensure the safe use of the battery during the charging and discharging process. The main functions of the BMS include the measurement of battery terminal voltage, energy balance between single cells, estimation of charge state and health state, power input and output restrictions, charging curve restrictions, and isolation of battery packs from loads. A battery cluster refers to a part composed of multiple battery modules. In a battery pack, there may be multiple battery clusters, each of which contains a group of cells that are connected in series and parallel. Battery clusters usually have the same voltage and capacity, and they can be combined to form a complete battery system.

[0044] For example, the battery cluster with the lowest voltage among all battery clusters is determined to be the first battery cluster, and then, the battery cluster with the lowest voltage other than the first battery cluster is determined to be the second battery cluster, and then, the difference between the voltage of the second battery cluster and the bus voltage is calculated, and if the difference between the voltage of the second battery cluster and the bus voltage is less than the first voltage value, it is determined that the battery cluster meets the power-on condition. For example, if the first voltage value is set to 0.8V, the difference of 0.7V is less than 0.8V, so the second battery cluster meets the power-on condition, that is, optionally, in some embodiments of the present application, the step of "detecting whether each battery cluster meets the power-on condition according to the voltage of each battery cluster in the battery energy storage system and the bus voltage" may specifically include:

[0045] Determine in the battery energy storage system that the battery cluster with the lowest voltage is the first battery cluster;

[0046] Determining in the battery energy storage system a second battery cluster with the lowest voltage other than the first battery cluster;

[0047] calculating a difference between a voltage of the second battery cluster and a bus voltage;

[0048] When the difference between the voltage of the second battery cluster and the bus voltage is less than the first voltage value, it is determined that the battery cluster meets the power-on condition.

[0049] For example, specifically, the voltage of battery cluster 1 (first battery cluster): 3.2V; the voltage of battery cluster 2 (second battery cluster): 3.3V; the voltage of battery cluster 3: 3.5V; the bus voltage: 4.0V; the first voltage value (threshold): 0.7V, first, calculate the difference between the second battery cluster and the bus voltage: 4.0V-3.3V=0.7V. Since 0.7V is exactly equal to the first voltage value 0.7V, battery cluster 2 meets the power-on condition.

[0050] Through this process, the BMS can ensure that the battery cluster is safely powered on with small voltage differences, thereby protecting the battery and extending its service life. This approach helps reduce the voltage difference between battery clusters, reduces the risk of failures such as contactor sticking, and improves system stability and reliability.

[0051] 102. If each battery cluster meets the power-on condition, pre-charge and power-on each battery cluster according to the pre-charge and power-on instruction.

[0052] For example, when the BMS confirms that all battery clusters meet the power-on conditions, it will issue a pre-charge power-on command to start the pre-charge power-on process. Pre-charge power-on refers to the process of charging the battery cluster with a small current before formal charging. The purpose is to ensure that the battery cluster is in a relatively balanced state before formal charging and reduce the risks that may be caused by high-current charging. During the pre-charge power-on stage, the BMS will control the charging current at a lower level to avoid excessive voltage shock to the battery cluster.

[0053] Optionally, in some embodiments of the present application, the step of “if each battery cluster meets the power-on condition, pre-charging and powering up each battery cluster according to the pre-charging and powering up instruction” may specifically include:

[0054] If each battery cluster meets the power-on condition, then detecting whether the difference between the battery cluster voltage and the bus voltage is less than a second voltage value;

[0055] If the difference between the battery cluster and the bus voltage is less than or equal to the second voltage value, the positive relay is closed, and the pre-charge relay is disconnected within a preset time to complete the pre-charge of the battery cluster.

[0056] For each battery cluster that meets the power-on conditions, the BMS detects the difference between its voltage and the bus voltage. If the difference between the voltage of the battery cluster and the bus voltage is less than or equal to the second voltage value, the battery cluster is considered suitable for pre-charge power-up. When the battery cluster meets the pre-charge power-up conditions, the BMS will close the positive relay of the battery cluster and officially start the pre-charge power-up process. During the pre-charge power-up stage, the BMS controls the low-current charging to ensure that the battery cluster is in a relatively balanced state before formal charging. During the pre-charge power-up process, the BMS will set a preset time. When the preset time is reached, the BMS will disconnect the pre-charge relay and end the pre-charge power-up stage. After the pre-charge relay is disconnected, the pre-charge power-up process of the battery cluster is completed, and the battery cluster is now ready for the next step of formal charging.

[0057] Optionally, in some embodiments of the present application, the following may be specifically included:

[0058] If the difference between the battery cluster voltage and the bus voltage is greater than the second voltage value, detecting whether the pre-charge time of the battery cluster is greater than a preset time;

[0059] If the pre-charge time of the battery cluster is greater than the preset time, the pre-charge relay and the main negative relay are disconnected, and all battery clusters are controlled to be powered off.

[0060] For example, if the difference between the total voltage of a battery cluster and the total bus voltage is less than or equal to 20V, the pre-charge relay is closed first to start the pre-charge power-on process. The balancing channel is opened, and the BMS performs inter-cluster balancing until the difference between the total voltage of the cluster and the total bus voltage is less than 5V before the charging equipment can be connected.

[0061] If the pre-charge time of the battery cluster exceeds 5 hours, the BMS will further detect the difference between the total voltage of the battery cluster and the total voltage of the bus. If this difference is greater than 5V, it means that the battery cluster has failed to reach a state close to the bus voltage within the specified time, which may mean a power-on failure. When it is confirmed that the pre-charge time exceeds 5 hours and the voltage difference is greater than 5V, the BMS will determine that the power-on start has failed and report a fault. This fault judgment is based on the internal logic and protection mechanism of the BMS to ensure the safety of the battery cluster and the reliability of the system. After determining that the power-on failure has occurred, the BMS will control the disconnection of the pre-charge relay and the main negative relay to cut off the electrical connection between the battery cluster and the bus. This is to protect the battery cluster from damage and prevent possible further failures. At the same time, for the safety of the entire system, the BMS will control all battery clusters to power off, that is, disconnect all battery clusters from the bus.

[0062] 103. Charge the pre-charged battery cluster and detect whether the cells of the battery cluster meet the full charge condition.

[0063] For example, specifically, during the charging process, the BMS will manage the charging process according to preset charging control parameters, including the maximum allowable single cell voltage of 3.65V, the maximum allowable total voltage of 175.2V, the minimum allowable single cell voltage of 2.2V, etc. During the charging process, the BMS will continuously monitor the voltage of the battery cell, and determine whether the battery cell meets the full charge condition based on the voltage. If the full charge condition is met, step 104 is executed; if the full charge condition is not met, the corresponding steps are executed, such as continuing charging, etc.

[0064] 104. When the cells of the battery cluster meet the full charge condition, adjust the charging ratio parameter of each battery cluster to a preset value.

[0065] It should be noted that the full charge condition may be: the single cell voltage reaches the full charge voltage of 3.5V and lasts for 100ms; or the total voltage reaches the single cell full charge voltage multiplied by the number of strings plus 5V and lasts for 100ms. That is, optionally, in some embodiments of the present application, the step of "adjusting the charging ratio parameters of each battery cluster to a preset value when the battery cells of the battery cluster meet the full charge condition" may specifically include:

[0066] If the single cell voltage of the battery cell in the battery cluster reaches the first preset voltage and lasts longer than the preset voltage, the charging ratio parameter of each battery cluster is adjusted to a preset value.

[0067] When any battery cluster is fully charged, the state of charge (SOC) of all battery clusters is calibrated to 100%.

[0068] During the charging process, for the charge and discharge control of the battery cell, the data configuration of the single battery cell is shown in the following table:

[0069]

[0070]

[0071] It should be noted that after full charging, the relay is not allowed to disconnect and must remain in a closed state to keep the BMS system circuit unobstructed, so that the BMS can continuously collect, analyze and process battery cell information; even in the event of a level 1 fault or a level 2 fault, the relay remains closed; when a level 3 fault occurs, the main positive relay and the main negative relay are disconnected.

[0072] Among them, the first-level fault (minor) usually refers to a fault that has no impact on the safety or life of the battery and only performs alarm processing. Such faults include: high temperature fault: when the battery temperature exceeds the preset safety threshold, although it will not immediately affect the safety of the battery, it needs to be paid attention to and an alarm is issued; excessive current fault: if the battery's charge and discharge current exceeds the safe range, the first-level fault will trigger an alarm, prompting to check the current abnormality. The second-level fault refers to a fault that has no impact on the safety or life of the battery, and an alarm and power limiting treatment are performed. Such faults include: high-voltage interlock fault: the high-voltage interlock function of the battery system fails, and it may be necessary to limit the output power of the battery and issue an alarm; contactor adhesion fault: the contactor in the battery system fails to open or close normally, and maintenance and repair are required, while limiting the battery power output. The third-level fault is the most serious fault, which has a direct impact on the safety or life of the battery and requires an alarm and disconnection treatment. Such faults include: External short circuit: If a short circuit is detected outside the battery, the BMS will perform hardware-level cut-off processing to protect the battery and system safety; Single cell voltage is too low or too high: When the battery cell voltage is abnormal, such as too low or too high, it may indicate that there is a serious problem with the battery and the power supply needs to be cut off immediately to prevent damage.

[0073] Level 1 fault handling: When a level 1 fault is detected, the BMS sends an early warning message to the upper computer (usually a central monitoring system or energy management system). This early warning message is used to alert operators to potential problems so that preventive measures can be taken.

[0074] Level 2 fault handling: For level 2 faults, the BMS will send an alarm message to the host computer, indicating that the problem is more serious than level 1 faults and needs to be checked and handled as soon as possible.

[0075] Level 3 fault handling: When a level 3 fault is detected, the BMS will not only report the fault to the upper computer, but also trigger the high-voltage power-off process of the BMS system, that is, disconnect the high-voltage circuit connected to the battery and issue a protection instruction to ensure safety.

[0076] Therefore, in the case of level 1 and level 2 faults, the BMS will not disconnect the relays. This is done to keep the system circuit open and ensure that the BMS can continue to monitor the battery status and perform its management functions. This allows the system to continue to operate when minor problems occur while monitoring and diagnosing the problems; in the case of level 3 faults, the BMS will disconnect the main positive and main negative relays to cut off the battery's charging and discharging path, prevent the fault from further deteriorating, and protect the battery and the entire system from damage.

[0077] Optionally, in some embodiments of the present application, the following may be specifically included:

[0078] When the pre-charged battery cluster is charged with a constant current, detecting whether the single cell voltage of the battery cell in the battery cluster is greater than a second preset voltage;

[0079] If the single cell voltage of the battery cell in the battery cluster is greater than the second preset voltage, the battery cluster is charged with reduced current;

[0080] Detecting whether the charging current of the battery cluster during the step-down charging process is less than or equal to the minimum charging current corresponding to the step-down charging process;

[0081] If the charging current of the battery cluster during the step-down charging process is less than or equal to the minimum charging current corresponding to the step-down charging process, the battery cluster is charged based on the minimum charging current.

[0082] When the battery cluster is charged with constant current, the BMS will monitor the single cell voltage of the battery cell in the battery cluster in real time to ensure that the battery cluster does not exceed the safety voltage limit during the charging process. If the single cell voltage of the battery cell in the battery cluster is greater than the second preset voltage, the BMS will start the current reduction charging strategy to reduce the charging current to protect the battery cluster. During the current reduction charging process, the BMS continues to monitor the charging current of the battery cluster to ensure that it is not lower than the minimum charging current corresponding to the current reduction charging process to avoid insufficient charging of the battery cluster. If the charging current of the battery cluster is less than or equal to the minimum charging current corresponding to the current reduction charging process during the current reduction charging process, the BMS will adjust the charging current to the minimum charging current to ensure that the battery cluster can continue to charge but does not exceed the safety limit.

[0083] Optionally, in some embodiments of the present application, it may further specifically include: if the charging current of the battery cluster during the step-down charging process is greater than the minimum charging current corresponding to the step-down charging process, charging with the minimum current is performed after a preset delay.

[0084] For example, specifically, during the constant current charging stage, the BMS monitors the single cell voltage of the battery cell in the battery cluster. If the single cell voltage is greater than the second preset voltage, the BMS will initiate a reduced current charging strategy to reduce the charging current to protect the battery cluster. During the reduced current charging process, the BMS continues to monitor the charging current of the battery cluster to ensure that it does not exceed the safety and preset current limit. If the charging current of the battery cluster is greater than the corresponding minimum charging current during the reduced current charging process, the BMS will not take immediate action. Instead, it will set a preset delay time, which can give the system some extra time to adjust and stabilize. After the preset delay period, if the charging current is still greater than the minimum charging current, the BMS will adjust the charging current to the minimum charging current level to ensure that the battery cluster can continue to charge without exceeding the safety limit.

[0085] In this way, while ensuring that the battery cluster will not be damaged by excessive charging current, it also ensures that the battery cluster can continue to charge at a safe charging rate. In this way, the BMS can balance the charging efficiency and safety of the battery cluster, extend the service life of the battery, and maintain the performance and reliability of the entire battery energy storage system.

[0086] The embodiment of the present application detects whether each battery cluster meets the power-on condition according to the voltage of each battery cluster and the bus voltage in the battery energy storage system. If each battery cluster meets the power-on condition, each battery cluster is pre-charged and powered on according to the pre-charge power-on instruction. Then, the pre-charged battery cluster is charged, and it is detected whether the battery cells of the battery cluster meet the full charge condition. When the battery cells of the battery cluster meet the full charge condition, the charging ratio parameter of each battery cluster is adjusted to a preset value. The charging and discharging control scheme based on the battery energy storage system provided in the present application pre-charges and powers on the battery cluster according to the voltage of each battery cluster and the bus voltage in the battery energy storage system to avoid excessive charging current caused by direct charging and affecting charging safety. Subsequently, the pre-charged battery cluster is charged, and when the battery cells of the battery cluster meet the full charge condition, the charging ratio parameter of each battery cluster is adjusted to a preset value. Thus, the charging and discharging of the battery cells can be accurately controlled, the service life of the battery cells is extended, and the battery energy storage system can be operated more efficiently and safely.

[0087] In addition, the present application also provides an electronic device, such as Figure 2 As shown, it shows a schematic diagram of the structure of the electronic device involved in the embodiment of the present application, specifically:

[0088] The electronic device may include components such as a processor 301 with one or more processing cores, a memory 302 with one or more computer-readable storage media, a power supply 303, and an input unit 304. Those skilled in the art will appreciate that Figure 2 The electronic device structure shown in the figure does not constitute a limitation on the electronic device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0089] The processor 301 is the control center of the electronic device. It uses various interfaces and lines to connect various parts of the entire electronic device. By running or executing software programs and / or modules stored in the memory 302, and calling data stored in the memory 302, it executes various functions of the electronic device and processes data, thereby monitoring the electronic device as a whole. Optionally, the processor 301 may include one or more processing cores; preferably, the processor 301 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor 301.

[0090] The memory 302 can be used to store software programs and modules. The processor 301 executes various functional applications and charge and discharge control based on the battery energy storage system by running the software programs and modules stored in the memory 302. The memory 302 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area may store data created according to the use of the electronic device, etc. In addition, the memory 302 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices. Accordingly, the memory 302 may also include a memory controller to provide the processor 301 with access to the memory 302.

[0091] The electronic device also includes a power supply 303 for supplying power to each component. Preferably, the power supply 303 can be logically connected to the processor 301 through a power management system, so that the power management system can manage charging, discharging, power consumption and other functions. The power supply 303 can also include one or more DC or AC power supplies, recharging systems, power failure detection circuits, power converters or inverters, power status indicators and other arbitrary components.

[0092] The electronic device may further include an input unit 304, which may be used to receive input digital or character information and generate keyboard, mouse, joystick, optical or trackball signal input related to user settings and function control.

[0093] Although not shown, the electronic device may further include a display unit, etc., which will not be described in detail herein. Specifically in this embodiment, the processor 301 in the electronic device will load the executable files corresponding to the processes of one or more application programs into the memory 302 according to the following instructions, and the processor 301 will run the application programs stored in the memory 302, thereby realizing various functions, as follows:

[0094] According to the voltage of each battery cluster and the bus voltage in the battery energy storage system, detect whether each battery cluster meets the power-on condition; if each battery cluster meets the power-on condition, pre-charge and power on each battery cluster according to the pre-charge power-on instruction; charge the pre-charged battery cluster and detect whether the battery cells of the battery cluster meet the full charge condition; when the battery cells of the battery cluster meet the full charge condition, adjust the charging ratio parameters of each battery cluster to the preset value.

[0095] The specific implementation of the above operations can be found in the previous embodiments, which will not be described in detail here.

[0096] The embodiment of the present application detects whether each battery cluster meets the power-on condition according to the voltage of each battery cluster and the bus voltage in the battery energy storage system. If each battery cluster meets the power-on condition, each battery cluster is pre-charged and powered on according to the pre-charge power-on instruction. Then, the pre-charged battery cluster is charged, and it is detected whether the battery cells of the battery cluster meet the full charge condition. When the battery cells of the battery cluster meet the full charge condition, the charging ratio parameter of each battery cluster is adjusted to a preset value. The charging and discharging control scheme based on the battery energy storage system provided in the present application pre-charges and powers on the battery cluster according to the voltage of each battery cluster and the bus voltage in the battery energy storage system to avoid excessive charging current caused by direct charging and affecting charging safety. Subsequently, the pre-charged battery cluster is charged, and when the battery cells of the battery cluster meet the full charge condition, the charging ratio parameter of each battery cluster is adjusted to a preset value. Thus, the charging and discharging of the battery cells can be accurately controlled, the service life of the battery cells is extended, and the battery energy storage system can be operated more efficiently and safely.

[0097] A person of ordinary skill in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be completed by instructions, or by controlling related hardware through instructions. The instructions may be stored in a computer-readable storage medium and loaded and executed by a processor.

[0098] To this end, an embodiment of the present application provides a storage medium in which a plurality of instructions are stored, and the instructions can be loaded by a processor to execute the steps in any of the charge and discharge control methods based on a battery energy storage system provided in the embodiment of the present application. For example, the instructions can execute the following steps:

[0099] According to the voltage of each battery cluster and the bus voltage in the battery energy storage system, detect whether each battery cluster meets the power-on condition; if each battery cluster meets the power-on condition, pre-charge and power on each battery cluster according to the pre-charge power-on instruction; charge the pre-charged battery cluster and detect whether the battery cells of the battery cluster meet the full charge condition; when the battery cells of the battery cluster meet the full charge condition, adjust the charging ratio parameters of each battery cluster to the preset value.

[0100] The specific implementation of the above operations can be found in the previous embodiments, which will not be described in detail here.

[0101] The storage medium may include: a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0102] Since the instructions stored in the storage medium can execute the steps in any one of the charge and discharge control methods based on the battery energy storage system provided in the embodiments of the present application, the beneficial effects that can be achieved by any one of the charge and discharge control methods based on the battery energy storage system provided in the embodiments of the present application can be achieved. For details, please refer to the previous embodiments and will not be repeated here.

[0103] The above is a detailed introduction to a charge and discharge control method, electronic device and storage medium based on a battery energy storage system provided in an embodiment of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A charge and discharge control method based on a battery energy storage system, characterized in that: include: According to the voltage of each battery cluster and the bus voltage in the battery energy storage system, detecting whether each battery cluster meets the power-on condition; If each of the battery clusters meets the power-on condition, pre-charging and powering up each of the battery clusters according to the pre-charging and powering up instruction; Charging the pre-charged battery cluster and detecting whether the cells of the battery cluster meet the full charging condition; When the cells of the battery cluster meet the full charge condition, the charging ratio parameter of each battery cluster is adjusted to a preset value.

2. The charge and discharge control method according to claim 1, characterized in that: The detecting whether each battery cluster meets the power-on condition according to the voltage of each battery cluster and the bus voltage in the battery energy storage system includes: Determining in the battery energy storage system that the battery cluster with the lowest voltage is the first battery cluster; Determining in the battery energy storage system a second battery cluster with the lowest voltage other than the first battery cluster; calculating a difference between a voltage of the second battery cluster and a bus voltage; When the difference between the voltage of the second battery cluster and the bus voltage is less than the first voltage value, it is determined that the battery cluster meets the power-on condition.

3. The charge and discharge control method according to claim 1, characterized in that: If each of the battery clusters meets the power-on condition, pre-charging and powering up each of the battery clusters according to the pre-charging and powering up instruction includes: If each of the battery clusters meets the power-on condition, detecting whether the difference between the voltage of the battery cluster and the bus voltage is less than a second voltage value; If the difference between the battery cluster and the bus voltage is less than or equal to the second voltage value, the positive relay is closed, and the pre-charge relay is disconnected within a preset time to complete the pre-charge power-up of the battery cluster.

4. The charge and discharge control method according to claim 3, characterized in that: Also includes: If the difference between the voltage of the battery cluster and the bus voltage is greater than a second voltage value, detecting whether the pre-charging time of the battery cluster is greater than a preset time; If the pre-charging time of the battery cluster is greater than the preset time, the pre-charging relay and the main negative relay are disconnected, and all battery clusters are controlled to be powered off.

5. The charge and discharge control method according to claim 1, characterized in that: When the cells of the battery cluster meet the full charge condition, adjusting the charging ratio parameter of each battery cluster to a preset value includes: If the single cell voltage of the battery cell in the battery cluster reaches a first preset voltage and lasts longer than the preset voltage, the charging ratio parameter of each battery cluster is adjusted to a preset value.

6. The charge and discharge control method according to any one of claims 1 to 5, characterized in that: Also includes: When the pre-charged battery cluster is charged with a constant current, detecting whether the single cell voltage of the battery cell in the battery cluster is greater than a second preset voltage; If the single cell voltage of the battery cell in the battery cluster is greater than the second preset voltage, the battery cluster is charged with reduced current; Detecting whether the charging current of the battery cluster during the step-down charging process is less than or equal to the minimum charging current corresponding to the step-down charging process; If the charging current of the battery cluster during the step-down charging process is less than or equal to the minimum charging current corresponding to the step-down charging process, the battery cluster is charged based on the minimum charging current.

7. The charge and discharge control method according to claim 6, characterized in that: Also includes: If the charging current of the battery cluster is greater than the minimum charging current corresponding to the charging process during the step-down charging process, charging is performed at the minimum current after a preset delay.

8. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the charge and discharge control method based on the battery energy storage system as described in any one of claims 1 to 7 are implemented.

9. A computer-readable storage medium, characterized in that: A computer program is stored thereon, wherein when the computer program is executed by a processor, the steps of the charge and discharge control method based on the battery energy storage system as described in any one of claims 1 to 7 are implemented.

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