Charging and discharging control method, device, computer device and storage device

Abstract

The present invention belongs to the field of charge and discharge control technology, and in particular relates to a charge and discharge control method, device, computer device, and storage device for an energy storage system. The charge and discharge control method includes: obtaining the current current of the battery; if the current current is greater than a first current threshold, obtaining the current maximum allowable charging current of the battery, and judging whether the current maximum allowable charging current is greater than the minimum charging current; if so, controlling the battery to charge at the minimum charging current; if not, controlling the battery to charge at the current maximum allowable charging current; if the current current is less than a second current threshold, obtaining the current maximum allowable discharge current of the battery, and judging whether the current maximum allowable discharge current is greater than the minimum discharge current; if so, controlling the battery to discharge at the minimum discharge current; if not, controlling the battery to discharge at the current maximum allowable discharge current. This charge and discharge control method can effectively reduce the loss of the energy storage system, improve system efficiency, and thereby increase user benefits.

Description

Technical Field

[0001] The present invention belongs to the technical field of charge and discharge control, and in particular relates to a charge and discharge control method, device, computer device and storage device for an energy storage system. Background Art

[0002] As global environmental pollution and climate change become increasingly severe, people are placing increasing emphasis on the development of green energy. The use of green energy sources such as solar, wind, and hydropower can not only reduce greenhouse gas emissions but also lower energy costs. However, solar, wind, and hydropower are not always available and are characterized by volatility and intermittence, which poses a challenge to ensuring a stable energy supply. The application of energy storage technology addresses this shortcoming, providing a promising space for the development and application of the energy storage industry. With national policy guidance and local government support, the energy storage industry has experienced rapid and explosive growth, and market competition has become increasingly fierce. People are demanding higher and higher standards for the safety, efficiency, and cost of energy storage systems.

[0003] Currently, the mainstream energy storage system in the industry is electrochemical energy storage, typically consisting of energy storage batteries, PCS (Power Conversion System) equipment, fire protection systems, access control systems, EMS systems, BMS systems, and temperature control systems. Energy storage batteries are used to store electrical energy, charging from the grid and supplying the stored energy to load devices. PCS (Power Conversion System) equipment is a battery charge and discharge control module that controls the charge and discharge currents of the battery. Fire protection systems are used to detect unexpected accidents such as fires and explosions, enabling rapid extinguishing of fires or explosions to prevent the spread of the situation and avert disasters. Access control systems control the opening of energy storage cabinets or storage containers, and issue door opening alarms to prevent accidents caused by unauthorized or non-professional personnel. The EMS system is an energy management system that coordinates and manages the entire energy storage system, such as when to charge and discharge. The BMS system is a battery management system that monitors battery voltage, current, and temperature, calculates the SOC and SOH, and provides various battery protection functions for overvoltage, overcurrent, and overtemperature. The temperature control system, also known as the heat dissipation system, is used to control the temperature of the battery. The battery cannot be charged below 0 degrees. The allowed charge and discharge currents at different temperatures are also different. Therefore, the heat dissipation system can be used to cool the battery when the temperature is high to prevent thermal runaway and damage to the battery. The battery can be heated when the temperature is low to facilitate charging.

[0004] Existing energy storage systems typically charge batteries during off-peak electricity prices and discharge them during peak and peak electricity prices, thereby reducing electricity costs. For example, charging a battery for 100 kWh during off-peak electricity prices costs 31 yuan. During peak electricity prices, if 100 kWh of electricity is supplied to a load device, considering system efficiency, if only 90 kWh of electricity is supplied, the user's savings would be 90 * 1.116 - 100 * 0.31 = 69.44 yuan. If the system is more efficient and can only supply 92 kWh of electricity, the user's savings would be 92 * 1.116 - 100 * 0.31 = 71.672 yuan. This shows that higher system efficiency leads to greater user benefits.

[0005] Currently, energy storage systems generally use a 0.5C charge / 0.5C discharge configuration. For example, if the battery capacity is 280Ah, then the 0.5C charge current is 140A, and the 0.5C discharge current is also 140A, resulting in a 2-hour charge / 2-hour discharge cycle. Specifically, the system monitors time. When it detects that the electricity price is off-peak, it fully charges the battery within a preset 2-hour period. When it detects that the electricity price is on-peak, it fully discharges the battery to the load within a preset 2-hour period. During the charging and discharging process, the greater the charge and discharge current, the more heat is generated, requiring the temperature control system to cool down. This increases the power required to operate the temperature control system, or the longer the temperature control system operates. The greater the power and the longer the temperature control system operates, the greater the losses in the entire energy storage system, the lower the system efficiency, and the less benefit users receive. Summary of the Invention

[0006] Based on this, the purpose of the present invention is to provide a charge and discharge control method, device, computer device and storage device for an energy storage system, so as to fundamentally solve the problems of large loss, low system efficiency and low user benefits in the existing energy storage system during the charge and discharge process.

[0007] An embodiment of the present invention is implemented by providing a charge and discharge control method for an energy storage system, wherein the energy storage system includes a battery, and the charge and discharge control method includes:

[0008] Obtain peak electricity price periods, peak electricity price periods, and valley electricity price periods in the region where the energy storage system is located;

[0009] Calculating a minimum discharge current according to the peak electricity price period, the peak electricity price period, and the capacity of the battery, and calculating a minimum charge current according to the valley electricity price period and the capacity of the battery;

[0010] Obtaining the current of the battery;

[0011] If the current is greater than a first current threshold, controlling the battery to enter a charging mode includes:

[0012] Obtaining a current maximum allowable charging current of the battery, and determining whether the current maximum allowable charging current is greater than the minimum charging current;

[0013] If so, controlling the battery to charge at the minimum charging current;

[0014] If not, controlling the battery to be charged with the currently allowed maximum charging current;

[0015] If the current is less than a second current threshold, controlling the battery to enter a discharge mode includes:

[0016] Obtaining a current maximum allowable discharge current of the battery, and determining whether the current maximum allowable discharge current is greater than the minimum discharge current;

[0017] If so, controlling the battery to discharge at the minimum discharge current;

[0018] If not, the battery is controlled to discharge at the currently allowed maximum discharge current.

[0019] In some embodiments, controlling the battery to charge at the minimum charging current includes:

[0020] Determining whether the current current is greater than the minimum charging current;

[0021] If so, determining whether the battery needs to enter a fast charge mode; if it is determined that the battery does not need to enter a fast charge mode, controlling the battery to charge at the minimum charging current;

[0022] If not, controlling the battery to be charged with the minimum charging current.

[0023] In some embodiments, if it is determined that the battery needs to enter the fast charging mode, it is determined whether the temperature control system is started. If it is determined that the temperature control system is started, the current current is lowered until the temperature control system is stopped, and then the battery is controlled to charge with the current current. If it is determined that the temperature control system is not started, the current current is increased until the temperature control system is started, and then the current current is lowered and the battery is controlled to charge with the current current.

[0024] In certain embodiments, controlling the battery to discharge at the minimum discharge current comprises:

[0025] Determining whether the current is greater than the minimum discharge current;

[0026] If so, determining whether the battery needs to enter the fast-discharge mode; if it is determined that the battery does not need to enter the fast-discharge mode, controlling the battery to discharge at the minimum discharge current;

[0027] If not, the battery is controlled to discharge at the minimum discharge current.

[0028] In some embodiments, if it is determined that the battery needs to enter the fast-discharge mode, it is determined whether the temperature control system is activated. If it is determined that the temperature control system is activated, the current current is lowered until the temperature control system is stopped, and then the battery is controlled to discharge at the current current. If it is determined that the temperature control system is not activated, the current current is increased until the temperature control system is activated, and then the current current is lowered to control the battery to discharge at the current current.

[0029] In some embodiments, calculating the minimum discharge current according to the peak electricity price period, the peak electricity price period, and the capacity of the battery includes:

[0030] Calculating the peak electricity price duration of the day according to the peak electricity price period, calculating the peak electricity price duration of the day according to the peak electricity price period, and calculating the peak peak electricity price duration of the day according to the peak electricity price period and the peak electricity price period;

[0031] Obtaining the maximum value of the peak electricity price duration of the day, the peak electricity price duration of the day, and the peak peak electricity price duration of the day;

[0032] According to the formula: I min放 =C / T1, calculate the minimum discharge current, where I min放 is the minimum discharge current, C is the capacity of the battery, and T1 is the maximum value among the peak electricity price duration of the day, the peak electricity price duration of the day, and the peak peak electricity price duration of the day.

[0033] In some embodiments, calculating the minimum charging current according to the off-peak electricity price period and the capacity of the battery includes:

[0034] Calculate the duration of the low-valley electricity price for the day based on the low-valley electricity price period;

[0035] According to the formula: I min充 =C / T2, calculate the minimum charging current, where I min充 is the minimum charging current, C is the capacity of the battery, and T2 is the duration of the off-peak electricity price on that day.

[0036] Another embodiment of the present invention further provides a charge and discharge control device for an energy storage system, wherein the energy storage system includes a battery, and the charge and discharge control device includes:

[0037] A time period acquisition unit, configured to acquire a peak electricity price period, a peak electricity price period, and a valley electricity price period in the region where the energy storage system is located;

[0038] a current calculation unit, configured to calculate a minimum discharge current according to the peak electricity price period, the peak electricity price period, and the capacity of the battery, and to calculate a minimum charge current according to the valley electricity price period and the capacity of the battery;

[0039] a current acquisition unit, configured to acquire the current current of the battery;

[0040] a charging mode control unit, configured to control the battery to enter a charging mode if the current current is greater than a first current threshold, the charging mode control unit comprising:

[0041] a first current judgment module, configured to obtain a current maximum allowable charging current of the battery and judge whether the current maximum allowable charging current is greater than the minimum charging current;

[0042] a first charging module, configured to control the battery to be charged with the minimum charging current;

[0043] a second charging module, configured to, if no, control the battery to be charged with the currently allowed maximum charging current;

[0044] a discharge mode control unit, configured to control the battery to enter a discharge mode if the current current is less than a second current threshold, the discharge mode control unit comprising:

[0045] a second current judgment module, configured to obtain a current maximum allowable discharge current of the battery and judge whether the current maximum allowable discharge current is greater than the minimum discharge current;

[0046] a first discharging module, configured to control the battery to discharge at the minimum discharging current;

[0047] The second discharging module is configured to control the battery to discharge at the currently allowed maximum discharge current if no.

[0048] Another embodiment of the present invention further provides a computer 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 computer program, the steps of the charge and discharge control method as described in any one of the embodiments of the present invention are implemented.

[0049] Another embodiment of the present invention further provides a storage device, wherein the storage device stores a computer program, and the computer program can be executed to implement the steps of the charge and discharge control method as described in any one of the embodiments of the present invention.

[0050] The charge and discharge control method provided by the embodiment of the present invention first obtains the peak electricity price period, peak electricity price period and valley electricity price period of the area where the energy storage system is located. Then, based on the peak electricity price period, peak electricity price period and the capacity of the battery, the minimum discharge current is calculated, and based on the valley electricity price period and the capacity of the battery, the minimum charging current is calculated. Then, the current current of the battery is obtained. If the current current is greater than the first current threshold, the battery is controlled to enter the charging mode, and entering the charging mode includes obtaining the current maximum allowable charging current of the battery, determining whether the current maximum allowable charging current is greater than the minimum charging current, and if it is determined that the current maximum allowable charging current is greater than the minimum charging current, the battery is controlled to be charged with the minimum charging current, and if it is determined that the current maximum allowable charging current is not greater than the minimum charging current, the battery is controlled to be charged with the current maximum allowable charging current. If the current current is less than the second current threshold, the battery is controlled to enter a discharge mode. Entering the discharge mode includes obtaining the current maximum allowable discharge current of the battery, determining whether the current maximum allowable discharge current is greater than the minimum discharge current, and if it is determined that the current maximum allowable discharge current is greater than the minimum discharge current, controlling the battery to discharge at the minimum discharge current. If it is determined that the current maximum allowable discharge current is not greater than the minimum discharge current, controlling the battery to discharge at the current maximum allowable discharge current. This charge and discharge control method calculates the minimum discharge current based on the peak electricity price period, the peak electricity price period, and the capacity of the battery, and selects the current maximum allowable discharge current or the calculated minimum discharge current based on the actual battery conditions, thereby controlling the battery to discharge with a smaller discharge current. It also calculates the minimum charge current based on the off-peak electricity price period and the capacity of the battery, and selects the current maximum allowable charge current or the calculated minimum charge current based on the actual battery conditions, thereby controlling the battery to charge with a smaller charge current. During the charge and discharge process, less heat is generated, and less heat needs to be cooled by the temperature control system, or even no temperature control system is required for cooling, thereby effectively reducing the loss of the energy storage system, improving system efficiency, and thereby increasing user benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 is a flowchart of a charge and discharge control method provided in an embodiment of the present invention;

[0052] Figure 2 It is a structural block diagram of the charge and discharge control device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0053] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The drawings illustrate several embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0054] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0056] The embodiment of the present invention provides a charge and discharge control method for an energy storage system, wherein the energy storage system includes a battery, Figure 1 , the charge and discharge control method includes:

[0057] S100, obtaining a peak electricity price period, a peak electricity price period, and a valley electricity price period in the region where the energy storage system is located;

[0058] S200, calculating a minimum discharge current according to the peak electricity price period, the peak electricity price period, and the capacity of the battery, and calculating a minimum charge current according to the valley electricity price period and the capacity of the battery;

[0059] S300, obtaining the current current of the battery;

[0060] S400: If the current current is greater than a first current threshold, controlling the battery to enter a charging mode includes:

[0061] Obtaining a current maximum allowable charging current of the battery, and determining whether the current maximum allowable charging current is greater than the minimum charging current;

[0062] If so, controlling the battery to charge at the minimum charging current;

[0063] If not, controlling the battery to be charged with the currently allowed maximum charging current;

[0064] S500: If the current current is less than a second current threshold, control the battery to enter a discharge mode, including:

[0065] Obtaining a current maximum allowable discharge current of the battery, and determining whether the current maximum allowable discharge current is greater than the minimum discharge current;

[0066] If so, controlling the battery to discharge at the minimum discharge current;

[0067] If not, the battery is controlled to discharge at the currently allowed maximum discharge current.

[0068] In some embodiments, each region is divided into peak electricity price period, peak electricity price period, off-peak electricity price period and off-peak electricity price period according to the different electricity consumption conditions in each period. Refer to the following table:

[0069]

[0070] The table above shows electricity prices for a certain province at different times of the day. From 0:00 to 6:00, a total of six hours, the off-peak period is from January to December. From 6:00 to 9:00, a total of three hours, the off-peak period is from January to December. From 9:00 to 12:00, a total of three hours, the peak period is from January and December, and the off-peak period is from February to November. From 12:00 to 16:00, a total of four hours, the off-peak period is from January to December. From 16:00 to 17:00, a total of one hour, the off-peak period is from January to December, and the peak period is from February to November. From 17:00 to 18:00, a total of one hour, the peak period is from January to December, and the peak period is from February to November. From 18:00 to 19:00, a total of one hour, the peak period is from January and December, and the peak period is from February to November. From 7 PM to 8 PM, a total of one hour, January to December is the peak electricity price period. From 8 PM to 9 PM, a total of one hour, January and December are off-peak electricity price periods, July, August, and September are peak electricity price periods, and the rest of the year are peak electricity price periods. From 9 PM to 10 PM, a total of one hour, January and December are off-peak electricity price periods, July, August, and September are peak electricity price periods, and the rest of the year are peak electricity price periods. From 10 PM to 10 AM, a total of two hours, January to December are off-peak electricity price periods. The off-peak electricity price is 0.31 yuan / kWh, the off-peak price is 0.62 yuan / kWh, the peak price is 0.93 yuan / kWh, and the peak price is 1.116 yuan / kWh. The above are examples; actual situations may vary in different provinces. Please refer to the actual situation.

[0071] In the charge and discharge control method, the peak electricity price period, high-peak electricity price period, and off-peak electricity price period for the region where the energy storage system is located are first obtained. This can be accomplished by the user pre-configuring the electricity price periods for the region where the energy storage system is located, which the energy storage system then retrieves. Alternatively, the energy storage system, based on its own geographic location, retrieves the electricity price periods corresponding to its own location from a pre-stored database of global / national electricity price periods. Alternatively, the energy storage system retrieves the electricity price periods corresponding to its own location from a remote server via a network. The minimum discharge current is then calculated based on the obtained peak and high-peak electricity price periods, combined with the battery capacity. The minimum charge current is also calculated based on the off-peak electricity price period, combined with the battery capacity. The battery capacity is pre-configured at the factory, and the energy storage system then retrieves this information. The current battery current is then obtained and compared with a first current threshold and a second current threshold. If the first current threshold is greater than the second current threshold, the battery is controlled to enter charging mode. If the current is less than the second current threshold, the battery is controlled to enter a discharge mode. If the current is less than the first current threshold and greater than the second current threshold, the battery is controlled to maintain its original state.

[0072] When controlling the battery to enter charging mode, the system first obtains the battery's current maximum allowable charging current. This current maximum allowable charging current is determined by factors such as battery temperature and is generally preset in the battery management system. After obtaining parameters such as the battery temperature in its current state, the current maximum allowable charging current can be determined. The system then compares the current maximum allowable charging current with the minimum allowable charging current to determine whether it exceeds the minimum allowable charging current. If the current maximum allowable charging current is greater than the minimum allowable charging current, the battery is controlled to charge at the minimum allowable charging current. If the current maximum allowable charging current is not greater than the minimum allowable charging current, the battery is controlled to charge at the current maximum allowable charging current.

[0073] When controlling the battery to enter discharge mode, the system first obtains the battery's current maximum allowable discharge current. This maximum allowable discharge current is determined by factors such as battery temperature and is typically preset in the battery management system. After obtaining parameters such as the battery temperature in its current state, the system determines the current maximum allowable discharge current. The system then compares the current maximum allowable discharge current with the minimum allowable discharge current to determine whether it exceeds the minimum allowable discharge current. If the current maximum allowable discharge current exceeds the minimum allowable discharge current, the battery is controlled to discharge at the minimum allowable discharge current. If the current maximum allowable discharge current does not exceed the minimum allowable discharge current, the battery is controlled to discharge at the current maximum allowable discharge current.

[0074] This charge and discharge control method calculates the minimum discharge current based on peak electricity price periods, peak electricity price periods, and battery capacity, and selects either the currently allowed maximum discharge current or the calculated minimum discharge current based on the actual battery conditions, thereby controlling the battery to discharge using a smaller discharge current. Furthermore, it calculates the minimum charge current based on off-peak electricity price periods and battery capacity, and selects either the currently allowed maximum charge current or the calculated minimum charge current based on the actual battery conditions, thereby controlling the battery to charge using a smaller charge current. During the charge and discharge process, less heat is generated, requiring a temperature control system to cool down the heat, or even eliminating the need for a temperature control system for cooling. This effectively reduces energy storage system losses, improves system efficiency, and ultimately increases user benefits.

[0075] In some specific embodiments of the present application, controlling the battery to charge with the minimum charging current includes:

[0076] Determining whether the current current is greater than the minimum charging current;

[0077] If so, determining whether the battery needs to enter a fast charge mode; if it is determined that the battery does not need to enter a fast charge mode, controlling the battery to charge at the minimum charging current;

[0078] If not, controlling the battery to be charged with the minimum charging current.

[0079] In some embodiments, the current current and the minimum charging current are compared to determine whether the current current is greater than the minimum charging current. If the current current is greater than the minimum charging current, a determination is made as to whether the battery needs to enter a fast charging mode to determine whether the battery can be charged at a higher efficiency. If the battery does not need to enter a fast charging mode, the battery is controlled to charge at the minimum charging current. If the current current is not greater than the minimum charging current and it is determined that charging at the minimum charging current can meet the charging requirement, the battery is controlled to charge at the minimum charging current.

[0080] This charge and discharge control method compares the current current with the minimum charging current to determine whether the minimum charging current meets the charging requirements. If so, charging is controlled at the minimum charging current. If not, whether fast charging mode needs to be entered to determine whether charging efficiency needs to be improved. If fast charging mode is not required, charging is controlled at the minimum charging current, thereby achieving precise control of the charging process.

[0081] In some specific embodiments of the present application, if it is determined that the battery needs to enter the fast charging mode, it is determined whether the temperature control system is started. If it is determined that the temperature control system is started, the current current is lowered until the temperature control system is stopped, and then the battery is controlled to charge with the current current. If it is determined that the temperature control system is not started, the current current is increased until the temperature control system is started, and then the current current is lowered and the battery is controlled to charge with the current current.

[0082] In some embodiments, multiple current levels may be provided, and the current current may be adjusted according to each level. For example, when increasing or decreasing the current current, the current level may be adjusted upward or downward step by step based on the current level corresponding to the current current.

[0083] If the battery is determined to require fast charging, the system then determines whether the temperature control system is activated. If the system is activated, the current is lowered. When the current current is sufficiently low, the system stops. When the system is determined to be stopped, the battery is controlled to charge at the lowered current. If the system is not activated, the current is increased. When the current current is sufficiently high, the system activates. When the system is determined to be activated, the current is lowered again, for example, by one level, and the battery is controlled to charge at the lowered current.

[0084] After the battery enters the fast charging mode, this charge and discharge control method controls the temperature control system to stop or use the temperature control system as little as possible while controlling the current current to meet the charging demand, thereby minimizing the loss of the energy storage system, improving system efficiency, and thus maximizing the user's benefits.

[0085] In some specific embodiments of the present application, controlling the battery to discharge at the minimum discharge current includes:

[0086] Determining whether the current is greater than the minimum discharge current;

[0087] If so, determining whether the battery needs to enter the fast-discharge mode; if it is determined that the battery does not need to enter the fast-discharge mode, controlling the battery to discharge at the minimum discharge current;

[0088] If not, the battery is controlled to discharge at the minimum discharge current.

[0089] In some embodiments, the current current and the minimum discharge current are compared to determine whether the current current is greater than the minimum discharge current. If the current current is greater than the minimum discharge current, a determination is made as to whether the battery needs to enter a fast-discharge mode to determine whether the battery can be discharged at a higher efficiency. If the battery does not need to enter a fast-discharge mode, the battery is controlled to discharge at the minimum discharge current. If the current current is not greater than the minimum discharge current and it is determined that discharging at the minimum discharge current can meet the discharge requirement, the battery is controlled to discharge at the minimum discharge current.

[0090] This charge and discharge control method compares the current current with the minimum discharge current to determine whether the minimum discharge current meets the discharge requirements. If so, discharge is controlled at the minimum discharge current. If not, whether fast-discharge mode needs to be entered to determine whether discharge efficiency needs to be improved. If fast-discharge mode is not required, discharge is controlled at the minimum discharge current, thereby achieving precise control of the discharge process.

[0091] In some specific embodiments of the present application, if it is determined that the battery needs to enter the fast-release mode, it is determined whether the temperature control system is started. If it is determined that the temperature control system is started, the current current is lowered until the temperature control system is stopped, and then the battery is controlled to discharge with the current current. If it is determined that the temperature control system is not started, the current current is increased until the temperature control system is started, and then the current current is lowered to control the battery to discharge with the current current.

[0092] In some embodiments, multiple current levels may be provided, and the current current may be adjusted according to each level. For example, when increasing or decreasing the current current, the current level may be adjusted upward or downward step by step based on the current level corresponding to the current current.

[0093] If it is determined that the battery needs to enter fast-discharge mode, the device then determines whether the temperature control system is activated. If it is, the current current is lowered. When the current current is sufficiently low, the temperature control system is deactivated. When it is determined that the temperature control system is deactivated, the battery is controlled to discharge at the lowered current current. If it is determined that the temperature control system is not activated, the current current is increased. When the current current is sufficiently high, the temperature control system is activated. When it is determined that the temperature control system is activated, the current current is lowered again, for example, by one level, and the battery is controlled to discharge at the lowered current current.

[0094] After the battery enters the fast-discharge mode, this charge-discharge control method controls the temperature control system to stop or use the temperature control system as little as possible while controlling the current current to meet the discharge demand, thereby minimizing the loss of the energy storage system, improving system efficiency, and thus maximizing user benefits.

[0095] In some specific embodiments of the present application, the calculating the minimum discharge current according to the peak electricity price period, the peak electricity price period, and the capacity of the battery includes:

[0096] Calculating the peak electricity price duration of the day according to the peak electricity price period, calculating the peak electricity price duration of the day according to the peak electricity price period, and calculating the peak peak electricity price duration of the day according to the peak electricity price period and the peak electricity price period;

[0097] Obtaining the maximum value of the peak electricity price duration of the day, the peak electricity price duration of the day, and the peak peak electricity price duration of the day;

[0098] According to the formula: I min放 =C / T1, calculate the minimum discharge current, where I min放 is the minimum discharge current, C is the capacity of the battery, and T1 is the maximum value among the peak electricity price duration of the day, the peak electricity price duration of the day, and the peak peak electricity price duration of the day.

[0099] In some embodiments, after obtaining the peak electricity price period and the peak electricity price period, the peak electricity price duration of the day is calculated according to the peak electricity price period, the peak electricity price duration of the day is calculated according to the peak electricity price period, and the peak electricity price duration of the day and the peak electricity price duration of the day are calculated according to the peak electricity price period and the peak electricity price period, and then the peak peak electricity price duration of the day is calculated according to the sum of the peak electricity price duration of the day and the peak electricity price duration of the day. Then, the peak electricity price duration of the day, the peak electricity price duration of the day, and the peak peak electricity price duration of the day are compared, and the maximum value of the three is taken. Finally, according to the formula: I min放 =C / T1, calculate the minimum discharge current.

[0100] For example, if the battery capacity is 280Ah and the maximum of the peak electricity price duration, peak electricity price duration, and peak peak electricity price duration is 7 hours, the calculated minimum discharge current is 40A. At this time, the battery is controlled to discharge at a discharge current of 40A, and the battery will be fully discharged after 7 hours. Compared with the existing 0.5C discharge method, this embodiment uses a lower discharge current, which can further reduce the heat generated during the discharge process. The less heat needs to be cooled by the temperature control system, or even no temperature control system is required for cooling, thereby reducing losses in the energy storage system, improving system efficiency, and ultimately increasing user benefits.

[0101] In some specific embodiments of the present application, the calculating the minimum charging current according to the off-peak electricity price period and the capacity of the battery includes:

[0102] Calculate the duration of the low-valley electricity price for the day based on the low-valley electricity price period;

[0103] According to the formula: I min充 =C / T2, calculate the minimum charging current, where I min充 is the minimum charging current, C is the capacity of the battery, and T2 is the duration of the off-peak electricity price on that day.

[0104] In some embodiments, after obtaining the off-peak electricity price period, the off-peak electricity price duration of the day is calculated based on the off-peak electricity price period. Finally, according to the formula: min充 =C / T2, the minimum charging current is calculated.

[0105] For example, if the battery capacity is 280Ah and the off-peak electricity price lasts for 7 hours, the calculated minimum charging current is 40A. If the battery is charged at this 40A current, it will be fully charged after 7 hours. Compared to the existing 0.5C charging method, this implementation uses a lower charging current, which can further reduce the heat generated during charging. This reduces the amount of heat that needs to be cooled by the temperature control system, or even eliminates the need for temperature control. This reduces energy storage system losses, improves system efficiency, and ultimately increases user benefits.

[0106] An embodiment of the present invention provides a charge and discharge control device for an energy storage system, wherein the energy storage system includes a battery, and the charge and discharge control device includes:

[0107] The time period acquisition unit 100 is used to acquire the peak electricity price period, the peak electricity price period and the valley electricity price period of the area where the energy storage system is located;

[0108] a current calculation unit 200 for calculating a minimum discharge current according to the peak electricity price period, the peak electricity price period, and the capacity of the battery, and for calculating a minimum charge current according to the valley electricity price period and the capacity of the battery;

[0109] A current acquisition unit 300 is used to acquire the current current of the battery;

[0110] The charging mode control unit 400 is configured to control the battery to enter a charging mode if the current current is greater than a first current threshold. The charging mode control unit 400 includes:

[0111] a first current judgment module, configured to obtain a current maximum allowable charging current of the battery and judge whether the current maximum allowable charging current is greater than the minimum charging current;

[0112] a first charging module, configured to control the battery to be charged with the minimum charging current;

[0113] a second charging module, configured to, if no, control the battery to be charged with the currently allowed maximum charging current;

[0114] The discharge mode control unit 500 is configured to control the battery to enter a discharge mode if the current current is less than a second current threshold. The discharge mode control unit 500 includes:

[0115] a second current judgment module, configured to obtain a current maximum allowable discharge current of the battery and judge whether the current maximum allowable discharge current is greater than the minimum discharge current;

[0116] a first discharging module, configured to control the battery to discharge at the minimum discharging current;

[0117] The second discharging module is configured to control the battery to discharge at the currently allowed maximum discharge current if no.

[0118] In some specific embodiments of the present application, the first charging module includes:

[0119] A first current judgment submodule, configured to judge whether the current current is greater than the minimum charging current;

[0120] a first charging submodule, configured to: determine whether the battery needs to enter a fast charging mode; and if it is determined that the battery does not need to enter the fast charging mode, control the battery to be charged with the minimum charging current;

[0121] The second charging submodule is configured to control the battery to be charged with the minimum charging current if no.

[0122] In some specific embodiments of the present application, the first charging submodule is further used to determine whether the temperature control system is started if it is determined that the battery needs to enter the fast charging mode; if it is determined that the temperature control system is started, lower the current current until the temperature control system is stopped, and then control the battery to charge with the current current; if it is determined that the temperature control system is not started, increase the current current until the temperature control system is started, and then lower the current current to control the battery to charge with the current current.

[0123] In some specific embodiments of the present application, the first discharge module includes:

[0124] A second current judgment submodule, configured to judge whether the current current is greater than the minimum discharge current;

[0125] a first discharge submodule, configured to: determine whether the battery needs to enter a fast-discharge mode; and if it is determined that the battery does not need to enter the fast-discharge mode, control the battery to discharge at the minimum discharge current;

[0126] The second discharge submodule is configured to control the battery to discharge at the minimum discharge current if no.

[0127] In some specific embodiments of the present application, the first discharge sub-module is further configured to, if it is determined that the battery needs to enter a fast-discharge mode, determine whether the temperature control system is activated; if it is determined that the temperature control system is activated, lower the current current until the temperature control system is stopped, and then control the battery to discharge at the current current; if it is determined that the temperature control system is not activated, increase the current current until the temperature control system is activated, and then lower the current current to control the battery to discharge at the current current.

[0128] In some specific embodiments of the present application, the current calculation unit 200 includes:

[0129] A first duration calculation module is used to calculate the peak electricity price duration of the day according to the peak electricity price period, calculate the peak electricity price duration of the day according to the peak electricity price period, and calculate the peak peak electricity price duration of the day according to the peak electricity price period and the peak electricity price period;

[0130] A maximum duration acquisition module is used to obtain the maximum value of the peak electricity price duration of the day, the peak electricity price duration of the day, and the peak peak electricity price duration of the day;

[0131] The first formula calculation module is used to calculate the formula: min放 =C / T1, calculate the minimum discharge current, where I min放 is the minimum discharge current, C is the capacity of the battery, and T1 is the maximum value among the peak electricity price duration of the day, the peak electricity price duration of the day, and the peak peak electricity price duration of the day.

[0132] In some specific embodiments of the present application, the current calculation unit 200 includes:

[0133] The second duration calculation module is used to calculate the low-valley electricity price duration of the day according to the low-valley electricity price period;

[0134] The second formula calculation module is used to calculate the formula: min充 =C / T2, calculate the minimum charging current, where I min充 is the minimum charging current, C is the capacity of the battery, and T2 is the duration of the off-peak electricity price on that day.

[0135] In some embodiments, the implementation of the charge and discharge control device can refer to the implementation of the aforementioned charge and discharge control method, which will not be repeated here.

[0136] An embodiment of the present invention provides a computer device, which includes a processor, and the processor is configured to implement the steps of the charge and discharge control method described above when executing a computer program stored in a memory.

[0137] An embodiment of the present invention further provides a computer-readable storage medium having a computer program (instructions) stored thereon. When the computer program (instructions) is executed by a processor, the steps of the charge and discharge control method described above are implemented.

[0138] For example, a computer program can be divided into one or more modules, one or more of which are stored in a memory and executed by a processor to implement the present invention. One or more modules can be a series of computer program instruction segments that can perform specific functions, and the instruction segments are used to describe the execution process of the computer program in a computer device. For example, the computer program can be divided into the steps of the charge and discharge control method provided in each of the above-mentioned method embodiments.

[0139] Those skilled in the art will understand that the above description of the computer device is merely an example and does not constitute a limitation on the computer device. The computer device may include more or fewer components than described above, or a combination of certain components, or different components, for example, input and output devices, network access devices, buses, etc.

[0140] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor. The processor is the control center of the computer device and connects various parts of the entire computer device using various interfaces and lines.

[0141] The memory can be used to store the computer programs and / or modules. The processor implements the various functions of the computer device by running or executing the computer programs and / or modules stored in the memory and accessing the data stored in the memory. The memory may primarily include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function (such as an interface display function, an interface interaction function, etc.); the data storage area may store data created based on the use of the mobile phone (such as a map interface, a selection interface, etc.). In addition, the memory may include high-speed random access memory and non-volatile memory, such as a hard disk, internal memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0142] If the modules / units integrated into the computer device are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the present invention can also implement all or part of the processes in the above-mentioned method embodiments by using a computer program to instruct the relevant hardware. The computer program can be stored in a computer-readable storage medium. When executed by a processor, the computer program can implement the steps of each of the above-mentioned method embodiments. The computer program includes computer program code, which can be in source code form, object code form, executable file, or some intermediate form. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, electrical signal, and software distribution medium.

[0143] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0144] The above-described embodiments merely illustrate several embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A charge and discharge control method for an energy storage system, characterized in that: The energy storage system includes a battery, and the charge and discharge control method includes: Obtain peak electricity price periods, peak electricity price periods, and valley electricity price periods in the region where the energy storage system is located; Calculating a minimum discharge current according to the peak electricity price period, the peak electricity price period, and the capacity of the battery, and calculating a minimum charge current according to the valley electricity price period and the capacity of the battery; Obtaining the current of the battery; Controlling the battery to enter a charging mode, comprising: Obtaining a current maximum allowable charging current of the battery, and determining whether the current maximum allowable charging current is greater than the minimum charging current; If so, controlling the battery to charge at the minimum charging current; If not, controlling the battery to be charged with the currently allowed maximum charging current; Controlling the battery to enter a discharge mode, comprising: Obtaining a current maximum allowable discharge current of the battery, and determining whether the current maximum allowable discharge current is greater than the minimum discharge current; If so, controlling the battery to discharge at the minimum discharge current; If not, controlling the battery to discharge at the current maximum allowable discharge current; The controlling the battery to charge with the minimum charging current includes: Determining whether the current current is greater than the minimum charging current; If so, determining whether the battery needs to enter a fast charge mode; if it is determined that the battery does not need to enter a fast charge mode, controlling the battery to charge at the minimum charging current; If not, controlling the battery to be charged with the minimum charging current; If it is determined that the battery needs to enter the fast charging mode, determine whether the temperature control system is started. If it is determined that the temperature control system is started, lower the current current until the temperature control system is stopped, and then control the battery to charge with the current current. If it is determined that the temperature control system is not started, increase the current current until the temperature control system is started, then lower the current current, and control the battery to charge with the current current.

2. The charge and discharge control method according to claim 1, wherein: The controlling the battery to discharge at the minimum discharge current includes: Determining whether the current is greater than the minimum discharge current; If so, determining whether the battery needs to enter the fast-discharge mode; if it is determined that the battery does not need to enter the fast-discharge mode, controlling the battery to discharge at the minimum discharge current; If not, the battery is controlled to discharge at the minimum discharge current.

3. The charge and discharge control method according to claim 2, wherein: If it is determined that the battery needs to enter the fast-discharge mode, it is determined whether the temperature control system is activated. If it is determined that the temperature control system is activated, the current current is lowered until the temperature control system is stopped, and then the battery is controlled to discharge at the current current. If it is determined that the temperature control system is not activated, the current current is increased until the temperature control system is activated, and then the current current is lowered to control the battery to discharge at the current current.

4. The charge and discharge control method according to claim 1, wherein: The calculating the minimum discharge current according to the peak electricity price period, the peak electricity price period, and the capacity of the battery includes: Calculating the peak electricity price duration of the day according to the peak electricity price period, calculating the peak electricity price duration of the day according to the peak electricity price period, and calculating the peak peak electricity price duration of the day according to the peak electricity price period and the peak electricity price period; Obtaining the maximum value of the peak electricity price duration of the day, the peak electricity price duration of the day, and the peak peak electricity price duration of the day; According to the formula: I min放 =C / T1, calculate the minimum discharge current, where I min放 is the minimum discharge current, C is the capacity of the battery, and T1 is the maximum value among the peak electricity price duration of the day, the peak electricity price duration of the day, and the peak peak electricity price duration of the day.

5. The charge and discharge control method according to claim 1, wherein: The calculating the minimum charging current according to the off-peak electricity price period and the capacity of the battery includes: Calculate the duration of the low-valley electricity price for the day based on the low-valley electricity price period; According to the formula: I min充 =C / T2, calculate the minimum charging current, where I min充 is the minimum charging current, C is the capacity of the battery, and T2 is the duration of the off-peak electricity price on that day.

6. A charge and discharge control device for an energy storage system, characterized in that: The energy storage system includes a battery, and the charge and discharge control device includes: A time period acquisition unit, configured to acquire a peak electricity price period, a peak electricity price period, and a valley electricity price period in the region where the energy storage system is located; a current calculation unit, configured to calculate a minimum discharge current according to the peak electricity price period, the peak electricity price period, and the capacity of the battery, and to calculate a minimum charge current according to the valley electricity price period and the capacity of the battery; a current acquisition unit, configured to acquire the current current of the battery; A charging mode control unit, configured to control the battery to enter a charging mode, the charging mode control unit comprising: a first current judgment module, configured to obtain a current maximum allowable charging current of the battery and judge whether the current maximum allowable charging current is greater than the minimum charging current; a first charging module, configured to control the battery to be charged with the minimum charging current; a second charging module, configured to, if no, control the battery to be charged with the currently allowed maximum charging current; A discharge mode control unit, configured to control the battery to enter a discharge mode, the discharge mode control unit comprising: a second current judgment module, configured to obtain a current maximum allowable discharge current of the battery and judge whether the current maximum allowable discharge current is greater than the minimum discharge current; a first discharging module, configured to control the battery to discharge at the minimum discharging current; a second discharging module, configured to, if no, control the battery to discharge at the currently allowed maximum discharge current; The first charging module includes: A first current judgment submodule, configured to judge whether the current current is greater than the minimum charging current; a first charging submodule, configured to: determine whether the battery needs to enter a fast charging mode; and if it is determined that the battery does not need to enter the fast charging mode, control the battery to be charged with the minimum charging current; a second charging submodule, configured to, if no, control the battery to be charged with the minimum charging current; The first charging submodule is also used to determine whether the temperature control system is started if it is determined that the battery needs to enter the fast charging mode. If it is determined that the temperature control system is started, the current current is lowered until the temperature control system is stopped, and then the battery is controlled to be charged with the current current. If it is determined that the temperature control system is not started, the current current is increased until the temperature control system is started, and then the current current is lowered to control the battery to be charged with the current current.

7. A computer device, characterized in that: The method comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the charge and discharge control method according to any one of claims 1 to 5 when executing the computer program.

8. A storage device, characterized in that: The storage device stores a computer program, which can be executed to implement the steps of the charge and discharge control method according to any one of claims 1 to 5.

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