Control method of energy storage power supply, energy storage power supply, control device and storage medium

Abstract

The invention discloses a control method of an energy storage power supply, the energy storage power supply, a control device and a storage medium. The control method of the energy storage power supply comprises the following steps: under the condition that the energy storage power supply supplies power to the outside, controlling the battery module to output electric energy and the fan to start, so that the fan dissipates heat of the battery module and the inverter; under the condition that the temperature of the battery module is larger than or equal to the first preset temperature, the battery module is controlled to stop outputting electric energy to the inverter or the inverter is controlled to stop working, and the fan is controlled to work in a speed reduction mode; and under the condition that the temperature of the battery module is smaller than a second preset temperature, the fan is controlled to stop working, and the second preset temperature is smaller than or equal to the first preset temperature. According to the control method, the situation that after the battery module stops outputting electric energy to the inverter or the inverter is controlled to stop working, the temperature continues to rise too much, so that the battery cells are stored in a high-temperature environment, and then the consistency of the battery cells and the cycle life of the battery cells are affected can be avoided to a certain extent.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage equipment, and in particular relates to a control method for an energy storage power supply, an energy storage power supply, a control device and a storage medium. Background Art

[0002] In the related art, the application areas of portable energy storage power supplies are becoming increasingly broad, and the ambient temperatures of their applications are becoming increasingly higher. Therefore, when using portable energy storage power supplies, it is necessary to dissipate heat from the battery module to ensure that the battery module operates within the normal range. During the use of the energy storage power supply, if the temperature of the battery module is too high, the energy storage power supply will be triggered to stop working to prevent the battery module temperature from continuing to rise. However, after the energy storage power supply stops working, the battery module temperature may rise further, causing the battery module cells to be stored in a high-temperature environment, thereby affecting the consistency and cycle life of the battery cells. Summary of the Invention

[0003] The embodiments of the present invention provide a control method for an energy storage power supply, an energy storage power supply, a control device, and a storage medium to solve at least one of the above-mentioned technical problems.

[0004] An embodiment of the present invention provides a control method for an energy storage power supply, wherein the energy storage power supply includes a battery module, a wind turbine, and an inverter, wherein the battery module supplies power to the wind turbine and the inverter, and the control method includes:

[0005] When the energy storage power supply is supplying power to the outside, controlling the battery module to output power and starting the fan, so that the fan dissipates heat for the battery module and the inverter;

[0006] When the temperature of the battery module is greater than or equal to a first preset temperature, controlling the battery module to stop outputting power to the inverter or controlling the inverter to stop working, and controlling the fan to operate in a reduced speed mode;

[0007] When the temperature of the battery module is lower than the second preset temperature, the fan is controlled to stop working, and the second preset temperature is lower than or equal to the first preset temperature.

[0008] The above control method controls the battery module to stop outputting power to the inverter or controls the inverter to stop working when the temperature of the battery module is greater than or equal to the first preset temperature, and controls the fan to operate at a reduced speed. When the temperature of the battery module is less than the second preset temperature, the fan is controlled to stop working. This can, to a certain extent, avoid the situation where the temperature of the battery module continues to rise too much after stopping outputting power to the inverter or controlling the inverter to stop working, causing the battery cells to be stored in a high-temperature environment, thereby affecting the consistency of the battery cells and the cycle life of the battery cells.

[0009] In certain embodiments, when the energy storage power supply is supplying power to the outside, controlling the battery module to output power and starting the fan so that the fan dissipates heat for the battery module and the inverter includes:

[0010] When the energy storage power supply is in a loaded working mode, obtaining parameter information of the energy storage power supply, the parameter information including at least one of a state of charge, a temperature, and a voltage;

[0011] When the parameter information of the energy storage power source meets the preset conditions, controlling the battery module to output power and the fan to start;

[0012] When the parameter information of the energy storage power supply does not meet the preset conditions, the battery module and the fan are controlled to remain closed.

[0013] In the above control method, performance problems or safety hazards of the energy storage power supply can be discovered in time before the battery module is discharged, thereby ensuring that the battery module can be discharged normally to a certain extent.

[0014] In some embodiments, the difference between the first preset temperature and the second preset temperature is 4°C to 6°C.

[0015] The above control method can, to a certain extent, suppress the temperature of the battery module from continuing to rise, and ensure the safety and consistency of the battery module to a certain extent.

[0016] In certain embodiments, the control method comprises:

[0017] When the temperature of the battery module is greater than or equal to the first preset temperature and the state of charge of the energy storage power source is zero, controlling the battery module to stop outputting power to the inverter or controlling the inverter to stop working, and controlling the fan to turn off, and / or;

[0018] When the voltage of the battery module is less than or equal to the undervoltage protection voltage, the battery module is controlled to stop outputting power to the inverter or the inverter is controlled to stop working, and the fan is controlled to be turned off.

[0019] The above control method can avoid the over-discharge of the battery module and extend the service life of the battery module to a certain extent.

[0020] In certain embodiments, when the energy storage power supply is supplying power to the outside, controlling the battery module to output power and starting the fan so that the fan dissipates heat for the battery module and the inverter includes:

[0021] During the process of the battery module outputting electric energy, controlling the fan to operate at a first speed;

[0022] When the temperature of the battery module is greater than or equal to a first preset temperature, controlling the battery module to stop outputting power to the inverter or controlling the inverter to stop working, and controlling the fan to operate in a reduced speed mode, including:

[0023] The fan is controlled to operate at a second speed, wherein the first speed is greater than the second speed.

[0024] In the above control method, the fan is controlled to operate at a second speed that is lower than the first speed, which can ensure the heat dissipation effect of the battery module to a certain extent while saving electricity.

[0025] In some embodiments, controlling the fan to operate at the second speed includes:

[0026] The second speed of the fan is controlled to operate in a linear function speed reduction manner and / or a proportional speed reduction manner until the temperature of the battery module is lower than the second preset temperature.

[0027] In some embodiments, the second speed of the fan is controlled to operate in a linear function deceleration manner, that is, the duty cycle of the fan satisfies An% = -a×t+b (t>0), where An% is the duty cycle of the fan during operation, t is the time for the fan to cool the battery module after the battery module stops outputting electrical energy to the inverter or the inverter stops working, and a and b are both normal values.

[0028] In some embodiments, the second speed of the fan is controlled to operate in a proportional speed reduction manner, that is, the duty cycle of the fan satisfies An%=A%-△An%×t(t>0), where An% is the duty cycle of the fan during operation, A% is the duty cycle corresponding to the first speed of the fan, △An% is the rate of the duty cycle of the fan, and t is the time for the fan to cool the battery module after the battery module stops outputting electrical energy to the inverter or the inverter stops working.

[0029] In the above control method, the second speed control in a linear function speed reduction mode and / or a proportional speed reduction mode controls the operation of the fan, which can ensure the heat dissipation effect of the battery module to a certain extent while further saving electricity.

[0030] An embodiment of the present invention provides an energy storage power supply, comprising a control device, a battery module, a wind turbine, and an inverter. The control device is electrically connected to the battery module, the wind turbine, and the inverter. The battery module supplies power to the wind turbine and the inverter. The control device is configured as follows:

[0031] When the energy storage power supply is supplying power to the outside, controlling the battery module to output power and starting the fan, so that the fan dissipates heat for the battery module and the inverter;

[0032] When the temperature of the battery module is greater than or equal to a first preset temperature, controlling the battery module to stop outputting power to the inverter or controlling the inverter to stop working, and controlling the fan to operate in a reduced speed mode;

[0033] When the temperature of the battery module is lower than a second preset temperature, the fan is controlled to stop working, and the second preset temperature is lower than or equal to the first preset temperature.

[0034] In the above-mentioned energy storage power supply, when the temperature of the battery module is greater than or equal to the first preset temperature, the battery module is controlled to stop outputting electrical energy to the inverter or the inverter is controlled to stop working, and the fan is controlled to operate at a reduced speed. When the temperature of the battery module is lower than the second preset temperature, the fan is controlled to stop working. This can, to a certain extent, prevent the battery module from continuing to rise too much in temperature after stopping outputting electrical energy to the inverter or controlling the inverter to stop working, causing the battery cells to be stored in a high-temperature environment, thereby affecting the consistency and cycle life of the battery cells.

[0035] A control device provided by an embodiment of the present invention includes a processor and a memory;

[0036] The memory stores a computer program, and when the computer program is executed by the processor, the steps of the control method described in any of the above embodiments are implemented.

[0037] An energy storage power supply provided in an embodiment of the present invention includes the control device described in the above embodiment.

[0038] An embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the control method described in any of the above embodiments.

[0039] Additional aspects and advantages of the embodiments of the present invention will be given in part in the following description and in part will be obvious from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which:

[0041] Figure 1 and Figure 2 is a flow chart of a control method according to an embodiment of the present invention;

[0042] Figure 3 Schematic diagram of a module of an energy storage power supply according to an embodiment of the present invention;

[0043] Figure 4 Schematic diagram of the curves of the operating current, fan duty cycle and maximum temperature of the battery module according to an embodiment of the present invention;

[0044] Figure 5 1 is a schematic diagram of a curve showing the maximum temperature, the minimum temperature and the temperature difference therebetween of a battery module according to an embodiment of the present invention;

[0045] Figure 6 1 is a schematic diagram of the curves of the working current of the battery module, the fan duty cycle and the maximum temperature of the battery module in the comparative example;

[0046] Figure 7 Schematic diagram of the curve of the maximum temperature, minimum temperature and the temperature difference between them of the battery module in the comparative example.

[0047] Description of main component reference numerals:

[0048] Energy storage power supply 100, battery module 10, battery cell 11, wind turbine 30, inverter 50, control device 70, processor 71, memory 72. DETAILED DESCRIPTION

[0049] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention.

[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention. In the description of the present invention, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0051] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, removable connections, or integral connections. They may refer to mechanical connections or electrical connections. They may refer to direct connections or indirect connections through an intermediary, and they may refer to internal communication between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0052] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0053] The disclosure herein provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described herein. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art will appreciate the application of other processes and / or the use of other materials.

[0054] See also Figure 1 and Figure 3 The embodiment of the present invention provides a control method for an energy storage power supply 100. The energy storage power supply 100 includes a battery module 10, a wind turbine 30, and an inverter 50. The battery module 10 supplies power to the wind turbine 30 and the inverter 50. The control method includes:

[0055] 01, when the energy storage power supply 100 is supplying power to the outside, the battery module 10 is controlled to output power and the fan 30 is started, so that the fan 30 dissipates heat for the battery module 10 and the inverter 50;

[0056] 03. When the temperature of the battery module 10 is greater than or equal to the first preset temperature, the battery module 10 is controlled to stop outputting power to the inverter 50 or the inverter 50 is controlled to stop working, and the fan 30 is controlled to operate at a reduced speed;

[0057] 05. When the temperature of the battery module 10 is lower than the second preset temperature, the fan 30 is controlled to stop working. The second preset temperature is lower than or equal to the first preset temperature.

[0058] The above control method controls the battery module 10 to stop outputting electric energy to the inverter 50 or controls the inverter 50 to stop working when the temperature of the battery module 10 is greater than or equal to the first preset temperature, and controls the fan 30 to work in a reduced speed manner. When the temperature of the battery module 10 is lower than the second preset temperature, the fan 30 is controlled to stop working. This can, to a certain extent, avoid the situation where the temperature of the battery module 10 continues to rise too much after stopping outputting electric energy, causing the battery cell 11 to be stored in a high-temperature environment, thereby affecting the consistency of the battery cell 11 and the cycle life of the battery cell 11.

[0059] Specifically, the energy storage power supply 100 includes a battery module 10, a wind turbine 30, and an inverter 50. The battery module 10 is electrically connected to the wind turbine 30 and the inverter 50, and the battery module 10 supplies power to the wind turbine 30 and the inverter 50. Optionally, the battery module 10 is located within the housing of the energy storage power supply 100. In one embodiment, the battery module 10 can be composed of multiple battery cells 11 connected in series, parallel, or in a hybrid manner to store and release electrical energy. Hybrid means that the multiple battery cells 11 are connected in both parallel and series.

[0060] The inverter 50 is used to convert the direct current (DC) stored in the battery pack 10 into alternating current (AC). During discharge, the battery cells 11 convert the stored chemical energy into DC power, and the inverter 50 converts the DC power output from the battery pack 10 into AC power for external devices.

[0061] Since the battery module 10 and the inverter 50 generate heat during operation, the fan 30 can dissipate heat for the battery module 10 and the inverter 50 when running, so that the battery module 10 and the inverter 50 can operate within a suitable temperature range, thereby improving the performance and life of the battery module 10 to a certain extent.

[0062] In the related art, current portable energy storage power supplies typically use a hybrid cooling method of natural cooling and air cooling. When the load device is disconnected from the energy storage system, the energy storage device's built-in air cooling device immediately stops operating, relying solely on natural convection for heat dissipation. Furthermore, when the energy storage power supply reaches the first-level temperature protection threshold (the maximum temperature allowed for the battery module under normal operating conditions), the system not only cuts off power to the load but also forces the air cooling device to shut down. Both of these methods can lead to cascading thermal safety issues in scenarios where the battery module is operating under high load. Specifically, in a battery module composed of multiple cells, due to the limited space and complex structural layout, when the air cooling device stops functioning, heat accumulates within the battery module, causing the temperature to continue to rise. When the energy storage power supply reaches the second-level temperature protection threshold (the maximum temperature allowed for the battery module under extreme conditions, the second-level protection temperature threshold is greater than the first-level protection temperature threshold by approximately 3-4°C), the MOS transistor (metal oxide semiconductor field effect transistor) disconnects, and the energy storage power supply shuts down, making it impossible to detect the battery temperature. In addition, the battery module accumulates heat and the edge cells dissipate heat faster, resulting in a large temperature difference between the cells. Some cells are stored in high-temperature conditions for a long time, which will cause gas production and degradation of the cells, thereby affecting the consistency and cycle life of the cells.

[0063] In the embodiment of the present invention, please refer to Figure 3 Energy storage power supply 100 includes a battery management system (BMS), which is electrically connected to the battery module 10 and inverter 50. When energy storage power supply 100 is supplying power, the BMS controls the battery module 10 to output power to the inverter 50, which converts DC power into AC power and outputs it to the load. Simultaneously, the fan 30 activates to dissipate heat from the operating battery module 10 and inverter 50.

[0064] When the battery module 10 is discharging, heat is generated, causing the temperature of the battery module 10 to gradually increase. Optionally, the battery management system detects the temperature of the battery module 10. Optionally, the battery management system can obtain the maximum temperature of the battery module 10 for detection. The maximum temperature of the battery module 10 is the temperature value of the battery cell 11 with the highest temperature among all the battery cells 11 in the battery module 10 at the same time. When the battery management system detects that the temperature of the battery module 10 rises to a temperature greater than or equal to the first preset temperature, the battery management system controls the battery module 10 to stop outputting electrical energy to the inverter 50 or controls the inverter 50 to stop working to stop outputting electrical energy to the load.

[0065] To prevent the high temperature of the battery module 10 from causing heat accumulation in the battery cells 11 and causing the temperature of the battery module 10 to continue to rise, the fan 30 is controlled to operate at a reduced speed. This can dissipate heat more evenly from the battery module 10, thereby avoiding the situation where the outer surface of the battery module 10 cools down due to high speed operation while the internal part remains high due to high energy consumption, which may lead to the battery management system misjudging the temperature. Operating the fan 30 at a reduced speed can not only avoid the loud noise caused by the fan 30 running at full speed, but also avoid consuming too much energy from the battery module 10, thereby reducing the temperature rise of the battery module 10.

[0066] When the battery management system detects that the battery module 10 has cooled to a temperature below the second preset temperature, the fan 30 stops operating. Optionally, the energy storage power supply 100 can then dissipate heat through natural convection. When the battery module 10 is cooled to a temperature below or equal to the second preset temperature, this can, to a certain extent, prevent the temperature of the battery module 10 from rapidly rising back to the first preset temperature, or even rising too much and triggering the MOS tube of the battery module 10 to shut down, causing the battery management system to be unable to effectively monitor the temperature of the battery module 10. It can also reduce the temperature difference between the battery cells 11, thereby ensuring the consistency of the battery cells 11 and the cycle life of the battery cells 11 to a certain extent.

[0067] Optionally, the first preset temperature and the second preset temperature may be specifically defined by the type, chemical properties, physical properties, etc. of the battery module 10. The present invention is not specifically limited to this. In one example, the first preset temperature may be the first level temperature protection threshold of 62°C (degrees Celsius) for the battery module 10, and the second preset temperature may be 56°C.

[0068] In some embodiments, step 01 includes:

[0069] When the energy storage power supply 100 is in a loaded working mode, obtaining parameter information of the energy storage power supply 100, the parameter information including at least one of a state of charge, a temperature, and a voltage;

[0070] When the parameter information of the energy storage power supply 100 meets the preset conditions, the battery module 10 is controlled to output power and the fan 30 is started;

[0071] When the parameter information of the energy storage power supply 100 does not meet the preset conditions, the battery module 10 and the wind turbine 30 are controlled to remain turned off.

[0072] In this way, performance problems or safety hazards of the energy storage power supply 100 can be discovered in time before the battery module 10 is discharged, thereby ensuring that the battery module 10 can discharge normally to a certain extent.

[0073] Specifically, the energy storage power supply's load-bearing operation refers to controlling the battery module 10's output current and voltage to meet the load's requirements when the energy storage power supply 100 is connected to an external load (such as an electronic device, a motor, etc.). When the energy storage power supply 100 is in load-bearing operation mode, the battery management system can obtain parameter information of the energy storage power supply 100 and detect whether it meets preset conditions to check the state of the battery module 10 before discharge. Optionally, the parameter information includes at least one of state of charge, temperature, and voltage. If the parameter information of the energy storage power supply 100 meets the preset conditions, the battery management system determines that the battery module 10 is performing normally and controls the battery module 10 to supply power to the load via the inverter 50, while simultaneously activating the fan 30 to dissipate heat from the operating battery module 10. If the parameter information of the energy storage power supply 100 does not meet the preset conditions, the battery management system determines that the energy storage power supply 100 may have performance issues or safety hazards and cannot subsequently discharge normally, thereby controlling the battery module 10 and the fan 30 to remain in the off state.

[0074] It is understandable that after debugging the energy storage power supply 100 to meet the preset conditions, the battery management system can re-acquire the parameter information of the energy storage power supply 100 and detect whether it meets the preset conditions, thereby controlling the battery module 10 to output power and the fan 30 to start, or controlling the battery module 10 and the fan 30 to remain in the off state.

[0075] In one embodiment, when the energy storage power supply 100 is in a loaded operating mode, the battery management system obtains the state of charge of the battery module 10. The preset condition may be that the state of charge is greater than zero. If the energy storage power supply 100 satisfies the preset condition that the state of charge is greater than zero, the battery management system controls the battery module 10 to supply power externally and simultaneously activates the fan 30 to dissipate heat from the battery module 10. If the energy storage power supply 100 does not meet the preset condition that the state of charge is greater than zero, the battery module 10 and the fan 30 remain in a disabled state.

[0076] In one embodiment, when the energy storage power supply 100 is in a loaded operating mode, the battery management system obtains the temperature of the battery module 10. The preset condition may be that the temperature of the battery module 10 is less than a second preset temperature. If the energy storage power supply 100 satisfies the condition that the temperature of the battery module 10 is less than the second preset temperature, the battery management system controls the battery module 10 to supply power externally via the inverter 50 and simultaneously activates the fan 30 to dissipate heat from the battery module 10. If the temperature of the energy storage power supply 100 does not meet the condition that the temperature is less than the second preset temperature, the battery module 10 and the fan 30 remain in a disabled state.

[0077] In one embodiment, when the energy storage power supply 100 is in a loaded operating mode, the battery management system obtains the voltage of the battery module 10. The preset condition may be that the voltage of the battery module 10 is greater than a lower protection voltage. If the energy storage power supply 100 satisfies the condition that the voltage of the battery module 10 is greater than the lower protection voltage, the battery management system controls the battery module 10 to supply power to the outside via the inverter 50, and simultaneously activates the fan 30 to dissipate heat from the battery module 10. If the voltage of the energy storage power supply 100 does not meet the condition that the voltage is greater than the lower protection voltage, the battery module 10 and the fan 30 remain in a disabled state.

[0078] In one embodiment, when the energy storage power supply 100 is in a loaded operating mode, the battery management system obtains two of the state of charge, temperature, and voltage of the battery module 10. The preset conditions may be two corresponding to the obtained parameter information, namely, the state of charge is greater than zero, the temperature of the battery module 10 is less than a second preset temperature, and the voltage of the battery module 10 is greater than a lower limit protection voltage. If the energy storage power supply 100 meets the preset conditions corresponding to the obtained parameter information, the battery management system controls the battery module 10 to supply power externally via the inverter 50 and simultaneously activates the fan 30 to dissipate heat from the battery module 10. If the energy storage power supply 100 does not meet the preset conditions corresponding to the obtained parameter information, the battery module 10 and the fan 30 remain in a disabled state.

[0079] In one embodiment, when the energy storage power supply 100 is in load-carrying mode, the battery management system obtains the state of charge, temperature, and voltage of the battery module 10. Preset conditions are that the state of charge is greater than zero, the temperature of the battery module 10 is less than a second preset temperature, and the voltage of the battery module 10 is greater than a lower protection voltage. If the energy storage power supply 100 meets these three conditions, the battery management system controls the battery module 10 to supply power and simultaneously activates the fan 30 to dissipate heat from the battery module 10. If the energy storage power supply 100 does not meet all three conditions, the battery module 10 and the fan 30 remain off.

[0080] The parameter information and the corresponding preset conditions can be specifically limited according to actual conditions, and the present invention does not make specific limitations on this.

[0081] In some embodiments, the difference between the first preset temperature and the second preset temperature is 4°C to 6°C.

[0082] In this way, the temperature of the battery module 10 can be further suppressed from continuing to rise, thereby ensuring the safety and consistency of the battery module 10 to a certain extent.

[0083] Specifically, when the battery module 10 is discharging, when the battery management system detects that the temperature of the battery module 10 has risen to a temperature greater than or equal to a first preset temperature, the battery management system controls the battery module 10 to stop outputting electrical energy to the inverter 50 or controls the inverter 50 to stop working, and at the same time, the fan 30 operates at a reduced speed to dissipate heat from the battery module 10. When the battery management system detects that the temperature of the battery module 10 is less than or equal to a second preset temperature, the fan 30 stops working. Optionally, the energy storage power supply 100 can then dissipate heat through natural convection. A larger cooling range can further suppress the temperature of the battery module 10 from continuing to rise, and can reduce the temperature difference between the battery cells 11, thereby ensuring the consistency of the battery cells 11 and the cycle life of the battery cells 11 to a certain extent.

[0084] Optionally, the difference between the first preset temperature and the second preset temperature can be specifically limited according to actual conditions, which is not specifically limited in the present invention. In one example, the first preset temperature can be 62°C, the second preset temperature can be 56°C, and the difference between the first preset temperature and the second preset temperature is 6°C.

[0085] In one embodiment, the difference between the first preset temperature and the second preset temperature is ΔT, and 4°C ≤ ΔT ≤ 6°C. In one example, ΔT = 4°C, 4.2°C, 4.4°C, 4.6°C, 4.8°C, 5°C, 5.2°C, 5.4°C, 5.6°C, 5.8°C, 6°C, or other values greater than or equal to 4°C and less than or equal to 6°C.

[0086] In certain embodiments, see Figure 2 , control methods include:

[0087] 07. When the temperature of the battery module 10 is greater than or equal to the first preset temperature and the state of charge of the energy storage power supply 100 is zero, control the battery module 10 to stop outputting power to the inverter 50 or control the inverter 50 to stop working, and control the fan 30 to turn off, and / or;

[0088] When the voltage of the battery module 10 is less than or equal to the undervoltage protection voltage, the battery module 10 is controlled to stop outputting power to the inverter 50 or the inverter 50 is controlled to stop working, and the fan 30 is controlled to be turned off.

[0089] In this way, over-discharge of the battery module 10 can be avoided, thereby extending the service life of the battery module 10 to a certain extent.

[0090] Specifically, when the energy storage power supply 100 is supplying power, the battery module 10 outputs power to the load via the inverter 50, while the fan 30 is activated to dissipate heat from the battery module 10 and the inverter 50. The battery management system continuously monitors and obtains parameter information of the energy storage power supply 100 during the discharge process.

[0091] In one embodiment, when the battery management system detects that the temperature of the battery module 10 is greater than or equal to a first preset temperature and the state of charge is zero, the battery management system controls the battery module 10 to stop outputting electrical energy to the inverter 50 or controls the inverter 50 to stop working. At this time, since the state of charge of the battery module 10 is zero, there is no electrical energy to support the fan 30 to continue working, so the fan 30 is turned off.

[0092] In one embodiment, the battery management system continuously monitors and obtains parameter information of the energy storage power supply 100 during the discharge process of the battery module 10. When the battery management system detects that the voltage of the battery module 10 is less than or equal to the undervoltage protection voltage, the battery management system controls the battery module 10 to stop outputting power to the inverter 50 or controls the inverter 50 to stop working, and the fan 30 is turned off, thereby preventing the battery module 10 from over-discharging.

[0093] The undervoltage protection voltage is the lower limit protection voltage of the battery module 10, which is the minimum voltage required for the normal operation of the battery module 10. The undervoltage protection voltage can be specifically limited according to the type and chemical characteristics of the battery cell 11, and is not specifically limited in the present invention.

[0094] In some embodiments, step 01 includes: controlling the fan 30 to operate at a first speed during the process of the battery module 10 outputting electrical energy;

[0095] Step 03 includes: controlling the fan 30 to operate at a second speed, and the first speed is greater than the second speed.

[0096] In this way, after the battery module 10 stops outputting electrical energy, the fan 30 is controlled to operate at a second speed that is lower than the first speed, which can ensure the heat dissipation effect of the battery module 10 to a certain extent while saving energy.

[0097] Specifically, when the energy storage power supply 100 is supplying power to the outside, the battery management system controls the battery module 10 to output power to the load through the inverter 50. At the same time, the fan 30 is started and runs at a first speed to dissipate heat from the working battery module 10.

[0098] When the battery module 10 discharges, it generates heat, causing the temperature of the battery module 10 to gradually increase. When the battery management system detects that the battery module 10 has heated to a temperature greater than or equal to a first preset temperature, the battery management system controls the battery module 10 to stop supplying power to the inverter 50 or controls the inverter 50 to stop operating. Simultaneously, the fan 30 continues to operate at a second speed to dissipate heat from the battery module 10, which has stopped discharging the load, causing the temperature of the battery module 10 to gradually decrease. When the battery management system detects that the battery module 10 has cooled to below the second preset temperature, the fan 30 may stop operating.

[0099] Optionally, the fan 30 operates according to a certain rule with a duty cycle ranging from 0 to An% (An% is the duty cycle of the fan 30 during operation, with n=1, 2, 3, 4, ..., n). The second speed of the fan 30 is proportional to the duty cycle An%, and the second speed of the fan 30 is equal to the duty cycle An% multiplied by the first speed. In one example, when the duty cycle An% of the fan 30 during operation is 100%, the fan 30 operates at the first speed; when the duty cycle An% of the fan 30 is 0%, the fan 30 is completely turned off; and when the duty cycle is 50%, the fan 30 operates at half the first speed.

[0100] The first speed and the second speed can be specifically defined based on actual conditions and are not specifically limited in the present invention. In one example, the first speed can be the full speed of the fan 30 (i.e., the speed corresponding to a 100% duty cycle of the fan 30), and the second speed can be a speed less than the full speed.

[0101] In some embodiments, controlling the fan 30 to operate at the second speed includes:

[0102] The second speed of the fan 30 is controlled to operate in a linear function speed reduction manner and / or a proportional speed reduction manner until the temperature of the battery module 10 is lower than the second preset temperature.

[0103] In this way, the second speed-controlled fan 30 operating in a linear function speed reduction manner and / or a proportional speed reduction manner can ensure the heat dissipation effect of the battery module 10 to a certain extent while further saving electricity.

[0104] Specifically, the second speed of the fan 30 is controlled to operate in a linear function deceleration mode and / or a proportional deceleration mode, that is, the second speed is gradually reduced during operation, which can ensure the heat dissipation effect of the battery module 10 to a certain extent while saving energy, thereby helping to maintain the consistency of the performance of the battery module 10 and extend the service life of the battery module 10, while avoiding over-discharge of the battery module 10.

[0105] In one embodiment, the second speed of the fan 30 is controlled to operate in a linear function deceleration mode to dissipate heat from the battery module 10 and the inverter 50. The linear function deceleration mode means that the second speed can decrease at a constant rate over time.

[0106] In one embodiment, the second speed of the fan 30 is controlled to operate in a proportional speed reduction mode to dissipate heat from the battery module 10 and the inverter 50. The proportional speed reduction mode means that the second speed decreases at a fixed rate over time.

[0107] In one embodiment, the second speed of the fan 30 is controlled to operate in a linear function speed reduction mode and a proportional speed reduction mode to dissipate heat from the battery module 10 and the inverter 50. Optionally, the linear function speed reduction mode and the proportional speed reduction mode can be performed alternately or according to actual conditions.

[0108] The speed reduction method can be specifically limited according to actual conditions, and the present invention does not make any specific limitations on this.

[0109] Optionally, the fan 30 has at least two different second speeds. In one embodiment, after the battery module 10 stops outputting power to the inverter 50 or the inverter 50 is controlled to stop operating, the fan 30 begins operating at a second speed of A1% × the first speed (A1% < 100%). After a period of cooling, the second speed of the fan 30 drops to A2% × the first speed (A2% < A1%). At this time, the battery management system detects that the battery module 10 has cooled to below a second preset temperature and controls the fan 30 to shut down.

[0110] In some embodiments, the second speed of the fan 30 is controlled to operate in a linear function deceleration manner, that is, the duty cycle of the fan 30 satisfies An% = -a×t+b (t>0), where An% is the duty cycle of the fan during operation, t is the time for the fan 30 to cool the battery module 10 after the battery module stops outputting electrical energy to the inverter 50 or the inverter 50 stops working, and a and b are both normal values.

[0111] In this way, the second speed-controlled fan 30 operates in a linear function speed reduction manner, which can ensure the heat dissipation effect of the battery module 10 to a certain extent while further saving electricity.

[0112] Specifically, when the battery module 10 stops discharging and the fan 30 continues to operate, the fan 30 is controlled to operate in a linearly decelerated manner. In one embodiment, after the battery module 10 stops outputting power to the inverter 50 or the inverter 50 stops operating, the fan 30 begins operating at a second speed of A1% × the first speed (A1% < 100%). After a cooling time t, the second speed of the fan 30 is reduced to A2% × the first speed (A2% = -a × t + b). At this time, the battery management system detects that the battery module 10 has cooled to below a second preset temperature and controls the fan 30 to shut down.

[0113] Optionally, a and b are both conventional values (empirical coefficients). The values of a and b can be specifically limited based on multiple test fitting functions, which is not specifically limited in the present invention.

[0114] In some embodiments, the second speed of the fan 30 is controlled to operate in a proportional speed reduction manner, that is, the duty cycle of the fan 30 satisfies An%=A%-△An%×t(t>0), where An% is the duty cycle of the fan 30 during operation, A% is the duty cycle corresponding to the first speed of the fan 30, △An% is the rate of the duty cycle of the fan 30, and t is the time for the fan to cool the battery module 10 after the battery module 10 stops outputting electrical energy to the inverter 50 or the inverter 50 stops working.

[0115] In this way, the second speed control fan 30 is operated in a proportional speed reduction mode, which can ensure the heat dissipation effect of the battery module 10 to a certain extent while further saving electricity.

[0116] Specifically, when the battery module 10 stops discharging and the fan 30 continues to operate, the fan 30 is controlled to operate in a proportional speed reduction manner. In one embodiment, after the battery module 10 outputs power to the inverter 50 or the inverter 50 stops operating, the fan 30 begins to operate at a second speed of A1% × the first speed (A1% < 100%). After a cooling time t, the second speed of the fan 30 is reduced to A2% × the first speed (A2% = A% - ΔAn% × t). At this time, the battery management system detects that the battery module 10 has cooled to below a second preset temperature and controls the fan 30 to shut down.

[0117] Optionally, A% and ΔAn% may be specifically defined according to the operating power of the fan 30 , experiments, tests, etc., and the present invention does not impose any specific limitation on this.

[0118] Please combine Figure 3 The embodiment of the present invention provides an energy storage power supply 100, which includes a control device 70, a battery module 10, a wind turbine 30, and an inverter 50. The control device 70 is electrically connected to the battery module 10, the wind turbine 30, and the inverter 50. The battery module 10 supplies power to the wind turbine 30 and the inverter 50. The control device 70 is configured as follows:

[0119] When the energy storage power supply 100 is supplying power to the outside, the battery module 10 is controlled to output power and the fan 30 is started, so that the fan 30 dissipates heat for the battery module 10 and the inverter 50;

[0120] When the temperature of the battery module 10 is greater than or equal to the first preset temperature, the battery module 10 is controlled to stop outputting power to the inverter 50 or the inverter 50 is controlled to stop working, and the fan 30 is controlled to operate at a reduced speed;

[0121] When the temperature of the battery module 10 is lower than the second preset temperature, the fan 30 is controlled to stop working, and the second preset temperature is lower than or equal to the first preset temperature.

[0122] In the above-mentioned energy storage power supply 100, when the temperature of the battery module 10 is greater than or equal to the first preset temperature, the battery module 10 is controlled to stop outputting electrical energy to the inverter 50 or the inverter 50 is controlled to stop working, and the fan 30 is controlled to operate in a reduced speed manner. When the temperature of the battery module 10 is lower than the second preset temperature, the fan 30 is controlled to stop working. This can, to a certain extent, prevent the temperature of the battery module 10 from continuing to rise too much after stopping outputting electrical energy, causing the battery cell 11 to be stored in a high-temperature environment, thereby affecting the consistency of the battery cell 11 and the cycle life of the battery cell 11.

[0123] Specifically, please combine Figure 3 The energy storage power supply 100 includes a control device 70, a battery module 10, an inverter 50, and a wind turbine 30. The control device 70 is electrically connected to the battery module 10, the inverter 50, and the wind turbine 30. Optionally, the battery module 10 is electrically connected to the wind turbine 30, and the battery module 10 can provide operating power for the wind turbine 30. When the energy storage power supply 100 is supplying power to an external device, the control device 70 can control the battery module 10 and the wind turbine 30 to execute the control method of the above embodiment. The control device 70 controls the inverter 50 to convert the electrical energy stored in the battery module 10 into AC power for output to power the load. Optionally, the above control method can be preset in the control device 70.

[0124] The energy storage power supply 100 includes a battery management system. Figure 3 In the illustrated embodiment, the control device 70 may include a battery management system, which is electrically connected to the battery module 10 and the inverter 50. When the control device 70 receives a signal to supply power to the external power supply, the battery management system controls the battery module 10 to output power to the inverter 50, controls the inverter 50 to convert the power into AC power and output it to power the load, and simultaneously controls the fan 30 to start and dissipate heat from the battery module 10. When the battery management system determines that the temperature of the battery module 10 is greater than or equal to a first preset temperature, the battery module 10 is controlled to stop outputting power to the inverter 50 or to stop the inverter 50, and controls the fan 30 to continue operating until the battery management system determines that the temperature of the battery module 10 is less than a second preset temperature.

[0125] It is understandable that, in other embodiments, the control device 70 and the battery management system may be provided separately, and the control device 70 is communicatively connected to the battery management system.

[0126] A control device 70 provided in an embodiment of the present invention includes a processor 71 and a memory 72 . The memory 72 stores a computer program. When the computer program is executed by the processor 71 , the steps of the control method of any of the above embodiments are implemented.

[0127] Specifically, in one embodiment, when the computer program is executed by the processor 71, the implemented control method includes:

[0128] 01, when the energy storage power supply 100 is supplying power to the outside, the battery module 10 is controlled to output power and the fan 30 is started, so that the fan 30 dissipates heat for the battery module 10 and the inverter 50;

[0129] 03. When the temperature of the battery module 10 is greater than or equal to the first preset temperature, the battery module 10 is controlled to stop outputting power to the inverter 50, and the fan 30 is controlled to operate at a reduced speed;

[0130] 05. When the temperature of the battery module 10 is lower than the second preset temperature, the fan 30 is controlled to stop working. The second preset temperature is lower than or equal to the first preset temperature.

[0131] In one embodiment, the energy storage power supply 100 includes a battery module 10 (a ternary battery, a lithium iron phosphate battery, a lithium manganese iron phosphate battery, a sodium battery, etc.), a battery management system, an inverter 50, and a fan 30. First, the fully charged energy storage power supply 100 is left to stand in a 40°C environment for 8 hours to allow the temperature of the battery module 10 to reach 40°C. Then, the power is turned on, so that the energy storage power supply 100 is in a load-carrying mode and uses maximum power load. The battery management system detects and obtains parameter information of the current battery module 10. When the preset conditions are met, the battery management system controls the battery module 10 to output power and controls the fan 30 to operate at a first speed (full speed, i.e., the speed corresponding to a 100% duty cycle of the fan 30).

[0132] Figure 6 Schematic diagram of the curve of the working current of the battery module, the fan duty cycle and the maximum temperature of the battery module in the comparative example, Figure 7 It is a curve diagram of the maximum temperature, minimum temperature and temperature difference between the battery module in the comparative example. Among them, the maximum temperature of the battery module 10 is the temperature value of the battery cell 11 with the highest temperature among all the battery cells 11 in the battery module 10 at the same time, and the minimum temperature of the battery module 10 is the temperature value of the battery cell 11 with the lowest temperature among all the battery cells 11 in the battery module 10 at the same time. In the comparative example, when the battery management system detects that the temperature of the battery module is equal to the first preset temperature (about 62°C), the battery management system controls the battery module to stop outputting electricity and turns off the fan. Figure 6 As shown in Figure 2, after the battery module stops outputting power (the operating current drops to 0) and the fan is turned off (the fan duty cycle drops to 0), the temperature of the battery module continues to rise and even reaches the secondary temperature protection voltage threshold (about 65°C), which will trigger the MOS tube to disconnect, causing the energy storage power supply to shut down and unable to detect the battery temperature; at the same time, as Figure 7As shown, the temperature difference between battery cells increases significantly, posing certain safety risks.

[0133] Figure 4 Schematic diagram of the curves of the working current of the battery module 10, the duty cycle of the fan 30 and the maximum temperature of the battery module 10 according to the embodiment of the present invention. Figure 5 It is a schematic diagram of the curve of the maximum temperature, the minimum temperature and the temperature difference between the battery module 10 in the embodiment of the present invention. In the embodiment of the present invention, when the battery management system detects that the temperature of the battery module 10 is equal to the first preset temperature (about 62°C), the battery management system controls the battery module 10 to stop outputting electrical energy, and controls the fan 30 to operate at a gradually decreasing second speed (the duty cycle gradually decreases). When the second speed of the fan 30 drops to about 50% × the first speed, the battery management system detects that the temperature of the battery module 10 is equal to the second preset temperature (about 56°C). At this time, the fan 30 is turned off, and then the battery module 10 is cooled by natural convection. As Figure 4 As shown, after the battery module 10 stops outputting electrical energy (the operating current drops to 0), the temperature of the battery module 10 obviously drops and does not rise again; at the same time, as shown in FIG. Figure 5 As shown, the temperature difference of the battery cell 11 increases slightly, which ensures the consistency and safety of the battery cell 11 to a certain extent.

[0134] An energy storage power supply 100 provided in an embodiment of the present invention includes the control device 70 of the above embodiment.

[0135] Specifically, please combine Figure 3 The energy storage power supply 100 includes a control device 70, a battery module 10, an inverter 50, and a wind turbine 30. The control device 70 is electrically connected to the battery module 10, the inverter 50, and the wind turbine 30. When the energy storage power supply 100 is supplying power to an external device, the control device 70 can control the battery module 10 and the wind turbine 30 to execute the control method of the above embodiment. The control device 70 controls the inverter 50 to convert the electrical energy stored in the battery module 10 into AC power for output to power a load.

[0136] An embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by the processor 71 , the steps of the control method described in any of the above embodiments are implemented.

[0137] It should be noted that the above explanations of the implementation methods and beneficial effects of the control method are also applicable to the energy storage power supply 100 and computer-readable storage medium used in the embodiments of the present invention. To avoid redundancy, they are not elaborated here.

[0138] It is understood that a computer program includes computer program code. The computer program code may be in source code form, object code form, executable file, or some intermediate form. Computer-readable storage media may include: any entity or device capable of carrying computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), and software distribution medium. The processor 71 may be a central processing unit, or other general-purpose processor, digital signal processor (DSP), application specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc.

[0139] Throughout this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" indicate that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses 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.

[0140] Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A method for controlling an energy storage power supply, characterized in that: The energy storage power supply includes a battery module, a wind turbine and an inverter. The battery module supplies power to the wind turbine and the inverter. The control method includes: When the energy storage power supply is supplying power to the outside, controlling the battery module to output power and starting the fan, so that the fan dissipates heat for the battery module and the inverter; When the temperature of the battery module is greater than or equal to a first preset temperature, controlling the battery module to stop outputting power to the inverter or controlling the inverter to stop working, and controlling the fan to operate in a reduced speed mode; When the temperature of the battery module is lower than a second preset temperature, the fan is controlled to stop working, and the second preset temperature is lower than or equal to the first preset temperature.

2. The control method according to claim 1, characterized in that: When the energy storage power supply is supplying power to the outside, controlling the battery module to output power and starting the fan so that the fan dissipates heat for the battery module and the inverter includes: When the energy storage power supply is in a loaded working mode, obtaining parameter information of the energy storage power supply, the parameter information including at least one of a state of charge, a temperature, and a voltage; When the parameter information of the energy storage power source meets the preset conditions, controlling the battery module to output power and the fan to start; When the parameter information of the energy storage power supply does not meet the preset conditions, the battery module and the fan are controlled to remain closed.

3. The control method according to claim 1, wherein: The difference between the first preset temperature and the second preset temperature is 4° C. to 6° C.

4. The control method according to claim 1, wherein: The control method includes: When the temperature of the battery module is greater than or equal to the first preset temperature and the state of charge of the energy storage power source is zero, controlling the battery module to stop outputting power to the inverter or controlling the inverter to stop working, and controlling the fan to turn off, and / or; When the voltage of the battery module is less than or equal to the undervoltage protection voltage, the battery module is controlled to stop outputting power to the inverter or the inverter is controlled to stop working, and the fan is controlled to be turned off.

5. The control method according to claim 1, characterized in that: When the energy storage power supply is supplying power to the outside, controlling the battery module to output power and starting the fan so that the fan dissipates heat for the battery module and the inverter includes: During the process of the battery module outputting electric energy, controlling the fan to operate at a first speed; When the temperature of the battery module is greater than or equal to the first preset temperature, controlling the battery module to stop outputting power to the inverter or controlling the inverter to stop working, and controlling the fan to operate in a reduced speed mode, including: The fan is controlled to operate at a second speed, wherein the first speed is greater than the second speed.

6. The control method according to claim 5, characterized in that: Controlling the fan to operate at a second speed includes: The second speed of the fan is controlled to operate in a linear function speed reduction manner and / or a proportional speed reduction manner until the temperature of the battery module is lower than the second preset temperature.

7. The control method according to claim 6, characterized in that: The second speed of the fan is controlled to operate in a linear function deceleration manner, that is, the duty cycle of the fan satisfies An%=-a×t+b(t>0), where An% is the duty cycle of the fan during operation, t is the time for the fan to cool the battery module after the battery module stops outputting electrical energy to the inverter or the inverter stops working, and a and b are both normal values.

8. The control method according to claim 6, characterized in that: The second speed of the fan is controlled to operate in a proportional speed reduction manner, that is, the duty cycle of the fan satisfies An%=A%-△An%×t(t>0), wherein An% is the duty cycle of the fan during operation, A% is the duty cycle corresponding to the first speed of the fan, △An% is the rate of the duty cycle of the fan, and t is the time for the fan to cool the battery module after the battery module stops outputting electrical energy to the inverter or the inverter stops working.

9. An energy storage power supply, characterized in that: The system comprises a control device, a battery module, a fan and an inverter. The control device is electrically connected to the battery module, the fan and the inverter. The battery module supplies power to the fan and the inverter. The control device is configured as follows: When the energy storage power supply is supplying power to the outside, controlling the battery module to output power and starting the fan, so that the fan dissipates heat for the battery module and the inverter; When the temperature of the battery module is greater than or equal to a first preset temperature, controlling the battery module to stop outputting power to the inverter or controlling the inverter to stop working, and controlling the fan to operate in a reduced speed mode; When the temperature of the battery module is lower than a second preset temperature, the fan is controlled to stop working, and the second preset temperature is lower than or equal to the second preset temperature.

10. A control device, characterized in that: including processor and memory; The memory stores a computer program, and when the computer program is executed by the processor, the steps of the control method according to any one of claims 1 to 8 are implemented.

11. An energy storage power supply, characterized in that: Comprising the control device according to claim 10.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the control method according to any one of claims 1 to 8 are implemented.

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