A control method and system of a safe energy storage system

Abstract

The application discloses a kind of control method and system of safe energy storage system, safe energy storage system includes energy storage battery pack and battery management module, the control method of safe energy storage system includes obtaining the current temperature information and current pressure information of energy storage battery pack;According to current temperature information and current pressure information, determine the state information of energy storage battery pack;Based on the state information of energy storage battery pack, control battery management module manages the output power of energy storage battery pack.The embodiment of the application can collect the temperature of each battery monomer in energy storage battery pack and the pressure of energy storage battery pack in real time, effectively monitor the state of each battery monomer in energy storage battery pack.In addition, according to the state of energy storage battery pack, timely adjust the output of charge-discharge power of battery management module to energy storage battery pack, improve the accuracy of monitoring, avoid the occurrence of safety accident.

Description

Technical Field

[0001] The present invention relates to the field of energy storage battery control, and in particular to a control method and system for a safe energy storage system. Background Technology

[0002] In recent years, renewable energy power generation, such as wind, solar, or hydropower, has been widely used in power systems. Typically, power systems are equipped with supporting safe energy storage systems, which mainly consist of energy storage battery packs, battery management modules, and energy management systems to increase the safety, stability, and reliability of grid operation.

[0003] In existing technologies, safety warnings for batteries are usually only based on temperature. This method of determination is too simplistic and cannot meet the high requirements for safety warnings. Furthermore, it is impossible to collect data on the pressure between energy storage battery packs or individual battery cells. Therefore, it is impossible to use signals such as temperature and pressure to provide safety warnings for battery cells that are malfunctioning. Summary of the Invention

[0004] This invention provides a control method and system for a safe energy storage system, which improves the accuracy of detection and the operational safety of the energy storage system by monitoring the temperature of individual cells in the energy storage battery pack and the pressure of the energy storage battery pack.

[0005] In a first aspect, embodiments of the present invention provide a control method for a safe energy storage system, the safe energy storage system including an energy storage battery pack and a battery management module, the control method including:

[0006] Obtain the current temperature and pressure information of the energy storage battery pack;

[0007] The status information of the energy storage battery pack is determined based on the current temperature information and the current pressure information;

[0008] Based on the status information of the energy storage battery pack, the battery management module is controlled to manage the output power of the energy storage battery pack.

[0009] Optionally, determining the state of the energy storage battery pack based on the current temperature information and the current pressure information includes:

[0010] Based on the current pressure information, determine whether the current pressure of the energy storage battery pack is within a preset pressure threshold range;

[0011] If not, then the energy storage battery pack is determined to be in a first abnormal state;

[0012] If so, then based on the current temperature information, determine whether the current temperature of the energy storage battery pack is less than or equal to the first preset temperature;

[0013] If so, then the energy storage battery pack is determined to be in normal condition.

[0014] Optionally, determining the state of the energy storage battery pack based on the current temperature information and the current pressure information further includes:

[0015] When the current temperature of the energy storage battery pack is greater than the first preset temperature, it is determined whether the current temperature of the energy storage battery pack is less than or equal to the second preset temperature;

[0016] If so, the energy storage battery pack is determined to be in the second abnormal state.

[0017] Optionally, based on the state information of the energy storage battery pack, the battery management module is controlled to manage the output power of the energy storage battery pack, including:

[0018] When the energy storage battery pack is in a second abnormal state, the battery management module is controlled to reduce the output power of the energy storage battery pack.

[0019] Optionally, determining the state of the energy storage battery pack based on the current temperature information and the current pressure information further includes:

[0020] When the current temperature of the energy storage battery pack is greater than the second preset temperature, it is determined whether the current temperature of the energy storage battery pack is less than or equal to the third preset temperature;

[0021] If so, the energy storage battery pack is determined to be in the third abnormal state.

[0022] Optionally, based on the state information of the energy storage battery pack, the battery management module is controlled to manage the output power of the energy storage battery pack, including:

[0023] When the energy storage battery pack is in the third abnormal state, the battery management module is controlled to make the output power of the energy storage battery pack zero.

[0024] Optionally, determining the state of the energy storage battery pack based on the current temperature information and the current pressure information further includes:

[0025] When the current temperature of the energy storage battery pack is greater than the third preset temperature, the energy storage battery pack is determined to be in a fourth abnormal state.

[0026] Optionally, based on the state information of the energy storage battery pack, the battery management module is controlled to manage the output power of the energy storage battery pack, including:

[0027] When the energy storage battery pack is in the fourth abnormal state, the battery management module is controlled to stop the energy storage battery pack from outputting electrical signals.

[0028] Optionally, the safe energy storage system further includes an alarm module and / or a fire suppression module; the control method further includes:

[0029] Based on the status information of the energy storage battery pack, control the working status of the alarm module and / or fire protection module.

[0030] Secondly, embodiments of the present invention also provide a safe energy storage system, including: an energy storage battery pack, an optical fiber sensor, a cloud platform, and an early warning system;

[0031] The fiber optic sensor is used to collect temperature and pressure signals from the energy storage battery pack.

[0032] The cloud platform is used to analyze and transmit the temperature signal and the pressure signal to the early warning system;

[0033] The early warning system can implement the control method of the safe energy storage system provided in any embodiment of the present invention.

[0034] This invention, after acquiring the current temperature and pressure information of the energy storage battery pack, determines the state of the battery pack based on this information. According to the state of the battery pack, the battery management module can promptly control the output power of the battery pack to ensure the safe operation of the energy storage system. The technical solution provided by this invention can collect the temperature of each individual battery cell and the pressure of the energy storage battery pack in real time, effectively monitoring the state of each battery. This allows for timely adjustment of the output power of the energy storage battery pack based on the battery state, improving monitoring accuracy and preventing safety accidents. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a flowchart illustrating a control method for a safe energy storage system according to Embodiment 1 of the present invention.

[0037] Figure 2 This is a flowchart illustrating a control method for a safe energy storage system according to Embodiment 2 of the present invention.

[0038] Figure 3 This is a flowchart illustrating a control method for a safe energy storage system according to Embodiment 3 of the present invention;

[0039] Figure 4This is a flowchart illustrating a control method for a safe energy storage system according to Embodiment 4 of the present invention.

[0040] Figure 5 This is a flowchart illustrating a control method for a safe energy storage system according to Embodiment 5 of the present invention;

[0041] Figure 6 This is a schematic diagram of a safe energy storage system provided in Embodiment Six of the present invention. Detailed Implementation

[0042] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0043] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0044] Example 1

[0045] Figure 1 This is a flowchart illustrating a control method for a safe energy storage system according to Embodiment 1 of the present invention. This method can be executed by the safe energy storage system, which may consist of hardware and / or software. The safe energy storage system includes an energy storage battery pack and a battery management module. The control method for the safe energy storage system provided in this embodiment of the invention includes:

[0046] S110: Obtain the current temperature and pressure information of the energy storage battery pack.

[0047] Specifically, an energy storage battery pack refers to a battery pack capable of storing electrical energy, composed of multiple battery cells connected in series or parallel. The number of battery cells can be two, three, or four, etc., with no specific limitation on the number of battery cells, which can be adjusted adaptively according to the actual application. Furthermore, there is no specific limitation on the series or parallel connection method between the battery cells. During operation, the temperature of battery cells at different locations varies. Fiber Bragg grating temperature sensors can be used to collect the temperature data of battery cells at different locations, thereby obtaining the current temperature information of the energy storage battery pack. Further, the current temperature information of the energy storage battery pack includes, but is not limited to, the temperature values ​​of each battery cell. Fiber Bragg grating temperature sensors can monitor the temperature of battery cells; that is, by using fiber Bragg grating temperature sensors with different center bands, a one-to-one correspondence monitoring of the temperature of each battery cell can be achieved, avoiding missed detections of battery cell temperatures within the energy storage battery pack. In an exemplary embodiment, the fiber Bragg grating temperature sensors and each battery cell can be encoded in a one-to-one correspondence, so that the fiber Bragg grating temperature sensors collect the temperature of battery cells with the same encoding. Typically, thermistor temperature sensors are used to monitor the temperature of energy storage battery packs. However, these sensors have poor anti-interference capabilities and are prone to malfunction or reduced sensitivity during monitoring, resulting in low accuracy in monitoring battery pack temperature. Furthermore, after extensive use, this increases the failure rate of the temperature acquisition system and prevents module pressure sampling. Instead, the current pressure information of the energy storage battery pack can be monitored using fiber Bragg grating pressure sensors. The number of fiber Bragg grating pressure sensors can be one or more, adaptable to the needs of the actual application scenario; no specific limit is placed on the number of fiber Bragg grating pressure sensors here. Using fiber Bragg grating temperature sensors and fiber Bragg grating pressure sensors to monitor the temperature and pressure of the energy storage battery pack can effectively avoid electromagnetic signal interference and ensure the normal transmission of temperature and pressure information.

[0048] S120. Determine the status information of the energy storage battery pack based on the current temperature and pressure information.

[0049] The temperature and pressure information of the energy storage battery pack can determine its state information. This state information includes, but is not limited to, the battery pack's operating status, temperature status, pressure status, voltage status, current status, and power status. For example, for an energy storage battery pack already in use, each individual cell can have pre-set temperature and pressure thresholds. When the current temperature of a cell exceeds the temperature threshold, the energy storage battery pack's operating status is abnormal; when the current temperature of a cell does not exceed the temperature threshold, the energy storage battery pack's operating status is normal. Similarly, when the current pressure of a cell exceeds the pressure threshold, the energy storage battery pack's operating status is abnormal; when the current pressure of a cell does not exceed the pressure threshold, the energy storage battery pack's operating status is normal. Different cell models within the energy storage battery pack will have different corresponding temperature and pressure thresholds; therefore, no specific limitations are made here regarding the temperature and pressure thresholds for individual cells. It is understood that the operating status of the energy storage battery pack can be determined based on its current temperature and pressure information.

[0050] S130. Based on the status information of the energy storage battery pack, control the battery management module to manage the output power of the energy storage battery pack.

[0051] The safe energy storage system also includes a cloud platform. This platform stores material information, production batch information, and pre-stored temperature and pressure thresholds for each battery cell in the energy storage battery pack. By comparing and analyzing the current temperature and pressure information of the energy storage battery pack with the pre-stored temperature and pressure thresholds in the cloud platform, the operating state of the energy storage battery is determined. Furthermore, depending on the state of the energy storage battery pack, it can correspond to different output power. At this time, the battery management module can adjust the output power of the energy storage battery pack. For example, taking the temperature information of the energy storage battery pack as an example, when the temperature of a battery cell in the energy storage battery pack exceeds a first threshold temperature, the battery management module can reduce the output power of the energy storage battery pack. When the temperature of a battery cell in the energy storage battery pack exceeds a second threshold temperature, the battery management module can control the energy storage battery pack to stop outputting power. When the temperature of a battery cell in the energy storage battery pack exceeds a third threshold temperature, the battery management module can disconnect the transmission path of the energy storage battery pack's output power, thereby disconnecting the entire safe energy storage system's loop. The above is merely an illustrative example and is not intended to limit the scope of the embodiments of the present invention. For different energy storage battery packs, the corresponding battery management module can achieve targeted management of the output power of the energy storage battery pack; specific limitations are not provided here.

[0052] This invention, after acquiring the current temperature and pressure information of the energy storage battery pack, compares this information with pre-stored temperature and pressure data to determine the battery pack's state. Based on the battery pack's abnormal operating state, the battery management module can promptly control the charging / discharging power output of the battery pack, thereby ensuring the safe operation of the energy storage system. The technical solution provided by this invention can collect the temperature of each individual battery cell and the pressure of the energy storage battery pack in real time, effectively monitoring the state of each battery. Furthermore, by adjusting the power output of the energy storage battery pack in a timely manner based on the battery's state, the accuracy of monitoring is improved, preventing safety accidents.

[0053] Example 2

[0054] Figure 2 This is a flowchart illustrating a control method for a safe energy storage system according to Embodiment 2 of the present invention. Based on the above embodiment, it specifically provides a scheme for determining the state of the energy storage battery pack. The technical solution of this embodiment includes:

[0055] S210: Obtain the current temperature and pressure information of the energy storage battery pack.

[0056] S220. Based on the current pressure information, determine whether the current pressure of the energy storage battery pack is within the preset pressure threshold range. If not, execute S230; if yes, execute S240.

[0057] S230, It is determined that the energy storage battery pack is in the first abnormal state.

[0058] The pressure threshold range of the energy storage battery pack can be preset. This preset pressure threshold range is not specifically limited and can be adjusted according to actual conditions. When the current pressure value of the energy storage battery pack is within the preset pressure threshold range, the pressure state of the energy storage battery pack is normal. When the current pressure value of the energy storage battery pack is outside the preset pressure threshold range, the pressure state of the energy storage battery pack is abnormal, which can be understood as the energy storage battery pack being in a first abnormal state. For example, when the current pressure value of the energy storage battery pack exceeds the preset pressure threshold range, the batteries in the energy storage battery pack may have a problem with battery casing expansion due to battery aging. By comparing the current pressure information of the energy storage battery pack with the pressure threshold range, it is determined whether there is an abnormality in the energy storage battery pack, allowing management personnel to replace the problematic batteries in a timely manner to ensure the normal operation of the entire safe energy storage system.

[0059] S240. Based on the current temperature information, determine whether the current temperature of the energy storage battery pack is less than or equal to the first preset temperature. If so, execute S250.

[0060] S250, Confirm that the energy storage battery pack is in normal condition.

[0061] Specifically, the current temperature information of the energy storage battery pack is related to its operating status. The current temperature of the energy storage battery is compared with a first preset temperature to determine whether the current temperature is less than or equal to the first preset temperature. The first preset temperature can be preset; for example, it can be 45°C. If the current temperature of the energy storage battery pack does not exceed 45°C, it can be determined that the current energy storage battery pack is in a normal state, the entire safe energy storage system is operating normally, and the administrator does not need to adjust the settings of the safe energy storage system.

[0062] S260. Based on the status information of the energy storage battery pack, control the battery management module to manage the output power of the energy storage battery pack.

[0063] This invention compares the current pressure of the energy storage battery pack with a preset pressure threshold range. If the current pressure is outside the preset threshold range, the energy storage battery pack is determined to be in a first abnormal state. If the current pressure is within the preset threshold range, the current temperature of the energy storage battery pack is further compared with a first preset temperature. If the current temperature is less than or equal to the first preset temperature, the energy storage battery pack is determined to be in a normal state. The technical solution provided by this invention can collect the temperature and pressure of each battery cell in the energy storage battery pack in real time, and determine the state of each battery cell based on the temperature and pressure. Furthermore, the power output of the energy storage battery pack is adjusted promptly according to the state of the battery cells, improving the accuracy of monitoring.

[0064] Example 3

[0065] Figure 3 This is a flowchart illustrating a control method for a safe energy storage system according to Embodiment 3 of the present invention. Based on the above embodiment, it specifically provides a scheme for determining the state of the energy storage battery pack and adjusting the output power of the energy storage battery pack based on temperature comparison results. The technical solution of this embodiment includes:

[0066] S310: Obtain the current temperature and pressure information of the energy storage battery pack.

[0067] S320. Based on the current pressure information, determine whether the current pressure of the energy storage battery pack is within the preset pressure threshold range. If not, execute S330; if yes, execute S340.

[0068] S330, The energy storage battery pack is confirmed to be in the first abnormal state.

[0069] S340. Based on the current temperature information, determine whether the current temperature of the energy storage battery pack is less than or equal to the first preset temperature. If yes, proceed to S350; otherwise, proceed to S360.

[0070] S350, confirm that the energy storage battery pack is in normal condition.

[0071] S360. Determine whether the current temperature of the energy storage battery pack is less than or equal to the second preset temperature. If so, execute S370.

[0072] S370, The energy storage battery pack is confirmed to be in the second abnormal state.

[0073] Specifically, when the current temperature of the energy storage battery pack is higher than a first preset temperature, it is necessary to further compare the current temperature of the energy storage battery pack with a second preset temperature. The second preset temperature is higher than the first preset temperature. The second preset temperature can be preset; for example, it is 50°C. When the current temperature of the energy storage battery pack is 48°C, which exceeds the first preset temperature of 45°C but does not exceed the second preset temperature of 50°C, it can be determined that the energy storage battery pack is in a second abnormal state. It is understood that when the energy storage battery pack is in the second abnormal state, its current temperature is higher than the first preset temperature but less than or equal to the second preset temperature. The above is merely an example and is not intended to limit the embodiments of the present invention.

[0074] S380. When the energy storage battery pack is in the second abnormal state, control the battery management module to reduce the output power of the energy storage battery pack.

[0075] Specifically, when the energy storage battery pack is in the second abnormal state, its output power needs to be adjusted. Understandably, when the energy storage battery pack is in the second abnormal state, the battery management module can reduce its output power. For example, when the energy storage battery pack is in its normal state, its output power is 100%. However, when it is determined to be in the second abnormal state, the battery management module needs to reduce the output power to 80% or 70% of its normal output power. The specific power reduction value is not limited here and can be adapted to the actual application scenario. When the energy storage battery pack is in the second abnormal state, only the battery management module needs to reduce its output power to adjust the power output of the safe energy storage system. The battery management module can also transmit power limit alarm signals, allowing administrators to monitor and check for faults in the safe energy storage system in a timely manner for prompt maintenance.

[0076] This invention compares the current temperature of the energy storage battery pack with a first preset temperature. When the current temperature is less than or equal to the first preset temperature, the energy storage battery pack is determined to be in a normal state. When the current temperature is greater than the first preset temperature but less than a second preset temperature, the energy storage battery pack is determined to be in a second abnormal state, and its output power is reduced. The technical solution provided by this invention adjusts the power output of the energy storage battery pack in a timely manner based on its state, improving the accuracy of monitoring.

[0077] Example 4

[0078] Figure 4 This is a flowchart illustrating a control method for a safe energy storage system according to Embodiment 4 of the present invention. Based on the above embodiment, it specifically provides a scheme for determining the state of the energy storage battery pack and adjusting the output power of the energy storage battery pack based on temperature comparison results. The technical solution of this embodiment includes:

[0079] S401. Obtain the current temperature and pressure information of the energy storage battery pack.

[0080] S402. Based on the current pressure information, determine whether the current pressure of the energy storage battery pack is within the preset pressure threshold range. If not, proceed to S403; if yes, proceed to S404.

[0081] S403, The energy storage battery pack is confirmed to be in the first abnormal state.

[0082] S404. Based on the current temperature information, determine whether the current temperature of the energy storage battery pack is less than or equal to the first preset temperature. If yes, proceed to S405; otherwise, proceed to S406.

[0083] S405. Confirm that the energy storage battery pack is in normal condition.

[0084] S406. Determine whether the current temperature of the energy storage battery pack is less than or equal to the second preset temperature. If yes, proceed to S407; otherwise, proceed to S408.

[0085] S407. The energy storage battery pack is confirmed to be in the second abnormal state.

[0086] S408. When the current temperature of the energy storage battery pack is greater than the second preset temperature, determine whether the current temperature of the energy storage battery pack is less than or equal to the third preset temperature. If yes, execute S409; otherwise, execute S411.

[0087] S409. The energy storage battery pack is confirmed to be in the third abnormal state.

[0088] Specifically, when the current temperature of the energy storage battery pack is greater than a first preset temperature and also greater than a second preset temperature, it is necessary to compare the current temperature of the energy storage battery pack with a third preset temperature. The first preset temperature is less than the second preset temperature, and the second preset temperature is less than the third preset temperature. The third preset temperature can be preset; for example, it is 55°C. When the current temperature of the energy storage battery pack is 53°C, which exceeds the second preset temperature of 50°C but does not exceed the third preset temperature of 55°C, the energy storage battery pack is determined to be in a third abnormal state. When the energy storage battery pack is in the third abnormal state, its current temperature is greater than the second preset temperature but less than or equal to the third preset temperature. The above is merely an example and is not intended to limit the scope of this invention.

[0089] S410 When the energy storage battery pack is in the third abnormal state, control the battery management module to make the output power of the energy storage battery pack zero.

[0090] Specifically, when the energy storage battery pack is in the third abnormal state, its output power needs to be adjusted. This means that when the battery pack is in this state, the battery management module reduces its output power to zero, thus reducing the overall output power of the safe energy storage system to zero. Furthermore, when the battery pack is confirmed to be in the third abnormal state, the battery management module can also transmit a zero-power alarm signal, allowing administrators to promptly check and resolve the issue.

[0091] S411. When the current temperature of the energy storage battery pack is greater than the third preset temperature, the energy storage battery pack is determined to be in the fourth abnormal state.

[0092] S412. When the energy storage battery pack is in the fourth abnormal state, control the battery management module to make the energy storage battery pack stop outputting electrical signals.

[0093] Specifically, when the current temperature of the energy storage battery pack exceeds the third preset temperature, the current temperature of the energy storage battery pack is considered abnormal, thus determining that the energy storage battery pack is in a fourth abnormal state. The energy storage battery in the fourth abnormal state cannot function normally, and the battery management module can cause the energy storage battery pack to stop outputting electrical signals, thereby disconnecting the entire safe energy storage system circuit. The battery management module can also transmit fire alarm signals, facilitating timely handling by management personnel.

[0094] In this embodiment of the invention, when the current temperature of the energy storage battery pack is greater than a second preset temperature but less than a third preset temperature, the energy storage battery pack is determined to be in a third abnormal state, and its output power is reduced to zero. When the current temperature of the energy storage battery pack is greater than the third preset temperature, the energy storage battery pack is determined to be in a fourth abnormal state, the energy storage battery pack does not output an electrical signal, and the circuit of the safety energy storage control system is disconnected. The technical solution provided by this embodiment of the invention adjusts the power output of the energy storage battery pack in a timely manner according to its state, improving the accuracy of monitoring. In addition, it can issue alarms based on the state of the energy storage battery pack, reducing the probability of fire.

[0095] Example 5

[0096] Figure 5 This is a flowchart illustrating a control method for a safe energy storage system according to Embodiment 5 of the present invention. Based on the above embodiment, it specifically provides a scheme for controlling the operation of an alarm module or a fire suppression module according to the status information of the energy storage battery pack. The technical solution of this embodiment includes:

[0097] S510: Obtain the current temperature and pressure information of the energy storage battery pack.

[0098] S520: Determine the status information of the energy storage battery pack based on the current temperature and pressure information.

[0099] S530: Based on the status information of the energy storage battery pack, control the battery management module to manage the output power of the energy storage battery pack.

[0100] S540 controls the operating status of the alarm module and / or fire protection module based on the status information of the energy storage battery pack.

[0101] Specifically, the status information of the energy storage battery pack includes information on whether its operating status is normal or abnormal. When the energy storage battery pack is determined to be operating normally, the alarm module or fire suppression module will not activate; it can also be considered to be in standby or sleep mode, without specific limitations. When the energy storage battery pack is determined to be operating abnormally, further analysis is conducted to determine whether the alarm module and fire suppression module need to operate simultaneously, or only the alarm module or only the fire suppression module needs to operate, depending on the nature of the abnormality. For example, if the temperature of the energy storage battery pack exceeds the corresponding temperature threshold but there is no open flame in the safe energy storage system, the alarm module will be activated, but the fire suppression module does not need to be activated. If the temperature of the energy storage battery pack exceeds the corresponding temperature threshold and there is an open flame in the safe energy storage system, then both the alarm module and the fire suppression module need to be activated simultaneously.

[0102] Furthermore, the alarm module can be used to notify nearby personnel via sound, light, or electricity when a fault occurs in the safe energy storage system, thereby ensuring personnel safety. The fire-fighting module can be used to promptly spray fire extinguishing agents to extinguish fires and prevent the fire from spreading when open flames or smoke appear in the safe energy storage system.

[0103] Based on the above embodiments, optionally, before controlling the working status of the alarm module and / or fire protection module based on the status information of the energy storage battery pack, the working status of the battery management module can be obtained first, and it can be determined whether the wake-up function of the alarm module needs to be activated based on the working status of the battery management module, and the wake-up function can be used to wake up the battery management module.

[0104] Specifically, the battery management module can operate in four modes: running mode, standby mode, sleep mode, and power-off mode. When the battery management module is in running mode, the alarm module does not need to activate the wake-up function. When the battery management module is in standby or sleep mode, the alarm module needs to activate the wake-up function to wake up the battery management module and switch it from standby or sleep mode to running mode.

[0105] This invention determines whether to activate the alarm module or the fire suppression module based on the status of the energy storage battery pack. When the energy storage battery pack is operating normally, there is no need to activate the alarm module or the fire suppression module; when the energy storage battery pack is operating abnormally, the alarm module or the fire suppression module is activated selectively based on the operating status of the safe energy storage system, effectively reducing the probability of fire and improving the reliability of the entire safe energy storage system.

[0106] Example 6

[0107] Figure 6 This is a schematic diagram of a safe energy storage system according to Embodiment Six of the present invention. The safe energy storage system includes an energy storage battery pack 10, a fiber optic sensor 20, a cloud platform 30, and an early warning system 40. The fiber optic sensor 20 is used to collect temperature and pressure signals from the energy storage battery pack 10. The cloud platform 30 is used to analyze and transmit the temperature and pressure signals to the early warning system 40. The early warning system 40 can execute the control method of the safe energy storage system provided in any embodiment of the present invention. It possesses the corresponding functional modules and beneficial effects for executing the method.

[0108] The safe energy storage system also includes a broadband laser 50, a demodulator 60, an alarm module 70, a fire protection module 80, a battery management module 90, an energy management module 100, an energy storage inverter 110, and a transformer 120.

[0109] Furthermore, the broadband laser 50 provides the necessary light source for the fiber optic sensor 20, and the wavelength range emitted by the broadband laser 50 is 1500nm to 1600nm. When the laser light is incident on the fiber optic sensor 20, the fiber optic sensor 20 operates normally. The fiber optic sensor 20 also includes a fiber Bragg grating temperature sensor and a fiber Bragg grating pressure sensor. The fiber Bragg grating temperature sensor collects the temperature of each battery cell in the energy storage battery pack 10. When there are temperature differences between battery cells, different reflected wavelengths are generated by the fiber Bragg grating temperature sensor and enter the demodulator 60. The demodulator 60 analyzes and calculates the temperature signal of the battery, thereby calculating the temperature of the battery at different locations. The demodulator 60 transmits the battery temperature signal to the battery management module 90 and the cloud platform 30 respectively. The cloud platform 30 records the temperature data of each battery cell transmitted by the fiber Bragg grating temperature sensor, as well as the production data of the battery cells, such as material information, production process information, and batch information, etc., which are not specifically limited here. The cloud platform 30 can also process, analyze, and record the temperature and pressure signals of the battery cells. For example, the cloud platform 30 can record corresponding data at specific time periods, including temperature data C1 and pressure data C2 of the battery cells within period T. The cloud platform 30 is also equipped with a battery temperature prediction module, which calculates the heat generation of the battery cells in the current energy storage battery pack 10 based on data such as current, voltage, power, SOC or SOH, and predicts the operating temperature of the battery cells, using the predicted operating temperature of the battery cells as a safe temperature reference value.

[0110] For example, the predicted operating temperature of a battery cell can be T0, and the actual temperature of the battery cell can be T1. The difference between the real-time temperature T1 and the predicted temperature T0 is compared with a threshold deviation ΔT1. ΔT1 can be calculated using the 3θ outlier algorithm, and the formula for ΔT1 is: |ΔT|=C1(i1,i2,i3...in)-T0. The location and cumulative over-temperature duration of battery cells exceeding the threshold deviation are recorded and marked. When a battery cell deviates from the predicted temperature for an extended period, its safety status decreases, thus achieving the effect of identifying safety risks before a dangerous event occurs. By recording and marking the location and cumulative over-temperature duration of battery cells exceeding the threshold deviation, battery cells with low safety coefficients are marked, and the corresponding battery cells are periodically inspected, repaired, or replaced to ensure the reliability of the energy storage battery pack 10. When a safety event occurs in a battery cell, such as thermal runaway, overcharging, or temperature or pressure signals exceeding the alarm threshold, the cloud platform 30 will trigger and transmit an alarm signal to the early warning system 40. The early warning system 40 analyzes the temperature and pressure data of individual battery cells over a certain period based on the cloud platform 30 to identify the location of abnormal battery cells and transmits the safety status information of the battery cells to the battery management module 90. The battery management module 90 has bidirectional information transmission capabilities, receiving the safety status information of the battery cells transmitted by the early warning system 40 and adjusting the output power of the energy storage battery pack 10 accordingly to ensure its safety. The battery management module 90 can issue a control command to the energy management module 100 to reduce the maximum allowable output power of the energy storage battery pack 10. The adjusted output power is then transmitted to the energy storage inverter 110, which in turn transmits the power back to the energy management module 100 and feeds it back to the battery management module 90. The energy storage inverter 110 is also connected to the energy storage battery pack 10, converting the DC power from the battery pack 10 into AC power, which is then boosted by the transformer 120 and connected to the power grid to ensure the user's electricity needs. The aforementioned safe energy storage system possesses the corresponding functional modules and beneficial effects of the execution method.

[0111] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0112] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A control method for a safe energy storage system, the safe energy storage system comprising an energy storage battery pack and a battery management module, characterized in that, include: Obtain the current temperature and pressure information of the energy storage battery pack; Based on the current temperature information and the current pressure information, the state information of the energy storage battery pack is determined; wherein, determining the state of the energy storage battery pack includes: Based on the current pressure information, determine whether the current pressure of the energy storage battery pack is within a preset pressure threshold range; If not, then the energy storage battery pack is determined to be in a first abnormal state; If so, then based on the current temperature information, determine whether the current temperature of the energy storage battery pack is less than or equal to the first preset temperature; If so, then the energy storage battery pack is determined to be in a normal state; When the current temperature of the energy storage battery pack is greater than the first preset temperature, it is determined whether the current temperature of the energy storage battery pack is less than or equal to the second preset temperature; If so, then the energy storage battery pack is determined to be in the second abnormal state; Based on the status information of the energy storage battery pack, the battery management module is controlled to manage the output power of the energy storage battery pack. The safe energy storage system also includes a cloud platform, which stores the temperature and pressure thresholds of each battery cell in the energy storage battery pack. The system compares and analyzes the current temperature and pressure information of the energy storage battery pack with the pre-stored temperature and pressure thresholds of the battery cells in the cloud platform, and controls the battery management module to adjust the output power of the energy storage battery pack.

2. The control method for the safe energy storage system according to claim 1, wherein the battery management module is controlled to manage the output power of the energy storage battery pack based on the state information of the energy storage battery pack, comprising: When the energy storage battery pack is in a second abnormal state, the battery management module is controlled to reduce the output power of the energy storage battery pack.

3. The control method for the safe energy storage system according to claim 1, further comprising determining the state of the energy storage battery pack based on the current temperature information and the current pressure information, and including: When the current temperature of the energy storage battery pack is greater than the second preset temperature, it is determined whether the current temperature of the energy storage battery pack is less than or equal to the third preset temperature; If so, the energy storage battery pack is determined to be in the third abnormal state.

4. The control method for the safe energy storage system according to claim 3, wherein the battery management module is controlled to manage the output power of the energy storage battery pack based on the state information of the energy storage battery pack, comprising: When the energy storage battery pack is in the third abnormal state, the battery management module is controlled to make the output power of the energy storage battery pack zero.

5. The control method for the safe energy storage system according to claim 4, further comprising determining the state of the energy storage battery pack based on the current temperature information and the current pressure information, and including: When the current temperature of the energy storage battery pack is greater than the third preset temperature, the energy storage battery pack is determined to be in a fourth abnormal state.

6. The control method for the safe energy storage system according to claim 5, wherein the battery management module is controlled to manage the output power of the energy storage battery pack based on the state information of the energy storage battery pack, comprising: When the energy storage battery pack is in the fourth abnormal state, the battery management module is controlled to stop the energy storage battery pack from outputting electrical signals.

7. The control method for a safe energy storage system according to claim 1, wherein the safe energy storage system further includes an alarm module and / or a fire-fighting module; the control method further includes: Based on the status information of the energy storage battery pack, control the working status of the alarm module and / or fire protection module.

8. A safe energy storage system, characterized in that, include: Energy storage battery packs, fiber optic sensors, cloud platforms, and early warning systems; The fiber optic sensor is used to collect temperature and pressure signals from the energy storage battery pack. The cloud platform is used to analyze and transmit the temperature signal and the pressure signal to the early warning system; The early warning system is used to execute the control method of the safe energy storage system according to any one of claims 1-7.

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