Safety protection method and system for battery energy storage power station

Abstract

The invention discloses a safety protection method and system for a battery energy storage power station, and the method comprises the steps: obtaining the initial battery energy storage capacity, the initial battery diameter and the initial temperature of a single battery of the battery energy storage power station before packaging, the single battery is provided with a number, and the initial temperature is the surface temperature of the single battery; determining a first safety value of the battery cell based on the initial battery energy storage amount, the initial battery diameter and the initial temperature; a second battery energy storage amount, a second battery diameter, and a second temperature of the battery cell at a first instant are measured when the first safety value is within a safety value threshold range. The technical problem that the determined safety protection method of the battery energy storage power station is inaccurate due to the fact that the expansion of the battery monomers and the air velocity of the space of the battery energy storage power station are not considered when the safety level of the battery monomers of the battery energy storage power station is determined is solved.

Description

Technical Field

[0001] This invention relates to the field of battery energy storage power station protection technology, and more specifically, to a safety protection method and system for battery energy storage power stations. Background Technology

[0002] In my country's current energy storage power station technology, batteries have become the most widely used energy storage power source due to their high energy density and fast response time. However, battery energy storage power stations are prone to fire accidents due to their inherent characteristics. Therefore, ensuring the safety of battery energy storage power stations is particularly important. Currently, the direct cause of battery fires is thermal runaway. The main reason is that current monitoring only considers the ambient temperature of the battery energy storage power station and the surface temperature of the battery cells, without taking into account the expansion of the battery cells themselves and the air velocity in the battery energy storage power station space. This leads to inaccurate safety protection methods for battery energy storage power stations. Therefore, this paper proposes a state detection method and system for battery energy storage systems to solve the technical problem of inaccurate safety protection methods for battery energy storage power stations caused by the failure to consider the expansion of the battery cells themselves and the air velocity in the battery energy storage power station space when determining the safety level of the battery cells. Summary of the Invention

[0003] This invention provides a safety protection method and system for battery energy storage power stations, which solves the technical problem that the determination of the safety level of a battery cell in a battery energy storage power station does not take into account the expansion of the battery cell itself and the air velocity in the space of the battery energy storage power station, resulting in an inaccurate determination of the safety protection method for the battery energy storage power station.

[0004] According to one aspect of the present invention, a safety protection method for a battery energy storage power station is provided. The method may include: acquiring the initial battery energy storage, initial battery diameter, and initial temperature of a battery cell before encapsulation, wherein the battery cell is numbered, and the initial temperature is the surface temperature of the battery cell; determining a first safety value for the battery cell based on the initial battery energy storage, initial battery diameter, and initial temperature; when the first safety value is within a safety value threshold range, measuring a second battery energy storage, second battery diameter, and second temperature of the battery cell at a first moment; determining a second initial safety value for the battery cell based on the second battery energy storage, second battery diameter, second temperature, and the battery cell's operating years; collecting a third temperature and airflow velocity at a first moment from each of multiple monitoring points inside the battery compartment of the battery energy storage power station; determining an influence factor for the second initial safety value based on the second temperature, third temperature, and airflow velocity; determining a target initial safety value for the battery cell based on the second initial safety value and the influence factor of the second initial value; determining a safety level for the battery cell based on the target initial safety value; and determining a protection method for the battery cell based on its safety level.

[0005] Optionally, based on the initial battery energy storage, initial battery diameter, and initial temperature, a first safety value for a single battery cell is determined, including: according to a first formula. The first safety value L1 is obtained, where ρ1 is the initial battery energy, R1 is the initial battery diameter, and ω1 is the initial temperature.

[0006] Optionally, the initial battery diameter includes: measuring the battery diameter at each part of the marking on the battery cell; and averaging the battery diameter at each part of all markings to obtain the initial battery diameter.

[0007] Optionally, based on the second battery storage energy, the second battery diameter, the second temperature, and the operating years of the battery cell, a second initial safety value for the battery cell is determined, including: according to the second formula. The second safety value L2 is obtained, where ρ2 is the energy stored in the second battery, R2 is the diameter of the second battery, ω2 is the second temperature, and λ is the operating life of the battery cell.

[0008] Optionally, the influencing factors of the second safety initial value are determined based on the second temperature, the third temperature, and the air velocity, including: according to the third formula. The influence factor ε of the second initial safety value is obtained, where ω3 is the third temperature, ω2 is the second temperature, and v is the air velocity.

[0009] Optionally, determining the target initial safety value of a battery cell based on the second initial safety value and the influence factors of the second initial value includes: determining the product of the second initial safety value and the influence factors of the second initial value as the target initial safety value.

[0010] Optionally, the safety level of a battery cell is determined based on a target initial safety value, including: matching the target initial safety value with the safety values ​​corresponding to multiple safety levels of the battery cell to obtain the safety level of the battery cell.

[0011] In this embodiment of the invention, the initial battery energy storage, initial battery diameter, and initial temperature of a battery cell in a battery energy storage power station before packaging are obtained. Each battery cell is numbered, and the initial temperature is the surface temperature of the battery cell. Based on the initial battery energy storage, initial battery diameter, and initial temperature, a first safety value for the battery cell is determined. When the first safety value is within a safety value threshold range, the second battery energy storage, second battery diameter, and second temperature of the battery cell are measured at a first moment. Based on the second battery energy storage, second battery diameter, second temperature, and the battery cell's operating years, a second initial safety value for the battery cell is determined. A third temperature and airflow velocity are collected at each of multiple monitoring points inside the battery compartment of the battery energy storage power station at a first moment. Based on the second temperature, third temperature, and... This method involves determining the influence factor of airflow velocity on the second initial safety value; based on the second initial safety value and its influence factor, determining the target initial safety value for each battery cell; determining the safety level of each battery cell based on the target initial safety value; and determining the protection method for each battery cell based on its safety level. This approach solves the technical problem of inaccurate safety protection methods for battery storage power stations due to the failure to consider the expansion of the battery cells themselves and the airflow velocity within the power station space when determining the safety level of each battery cell. The method achieves the technical effect of improving the accuracy of the determined safety protection methods for battery storage power stations by considering numerous factors such as the expansion of the battery cells themselves and the airflow velocity within the power station space when determining the safety level of each battery cell.

[0012] Advantages of this invention:

[0013] Compared with existing technologies, this invention firstly determines a second safety value for a battery cell based on its energy storage, diameter, and surface temperature at the first moment after operation. Secondly, it determines an influence factor for the second initial safety value based on the third temperature and airflow velocity at each of multiple monitoring points inside the battery compartment of the battery storage power station at the first moment, and the battery surface temperature, third temperature, and airflow velocity at the first moment for each battery cell. Thirdly, it determines a target initial safety value for the battery cell based on the second initial safety value and the influence factor, determines the safety level of the battery cell based on the target initial safety value, and determines the protection method for the battery cell based on the safety level. By considering multiple factors of the battery cell after operation when determining the safety level, the resulting safety level of the battery cell is more accurate. Attached Figure Description

[0014] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0015] Figure 1 This is a flowchart of a safety protection method for a battery energy storage power station according to an embodiment of the present invention;

[0016] Figure 2 This is a structural block diagram of a battery energy storage power station safety protection system according to an embodiment of the present invention. Detailed Implementation

[0017] 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.

[0018] 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 terms can be used interchangeably 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.

[0019] Example 1

[0020] According to an embodiment of the present invention, a safety protection method for a battery energy storage power station is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system containing at least one set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0021] Figure 1 This is a flowchart of a safety protection method for a battery energy storage power station according to an embodiment of the present invention, such as... Figure 1 As shown, the method may include the following steps:

[0022] Step S101: Obtain the initial battery energy storage capacity, initial battery diameter, and initial temperature of the battery cell of the battery energy storage power station before packaging. The battery cell is numbered, and the initial temperature is the surface temperature of the battery cell.

[0023] In the technical solution provided by step S101 of the present invention, the initial battery energy storage of the battery cell is obtained by multiplying the open-circuit voltage, battery capacity and efficiency of the battery cell by measuring the open-circuit voltage, battery capacity and efficiency of the battery cell, measuring the diameter of the battery cell at different scales of the battery by measuring instrument, adding up the diameters at all different scales and averaging them, and then obtaining the initial battery diameter of the battery cell. The surface temperature of the battery cell is obtained by temperature sensor.

[0024] Step S102: Determine the first safety value of a single battery cell based on the initial battery energy storage, initial battery diameter, and initial temperature.

[0025] In the technical solution provided in step S102 of the present invention, the initial battery energy storage, initial battery diameter, and initial temperature are calculated to obtain a first safety value for a single battery cell, wherein the first safety value is a specific numerical value.

[0026] Step S103: When the first safety value is within the safety value threshold range, measure the second battery energy storage, second battery diameter and second temperature of the battery cell at the first moment.

[0027] In the technical solution provided by step S103 of the present invention, if the first safety value is within the safety value threshold range, the open circuit voltage, battery capacity and efficiency of the battery cell are measured at the first moment after the battery cell has been running for a period of time. The open circuit voltage, battery capacity and efficiency of the battery cell are multiplied to obtain the second battery energy storage of the battery cell. The second diameter of the battery cell at the first moment is measured, and the temperature sensor measures the second temperature of the battery cell.

[0028] Step S104: Based on the energy storage of the second battery, the diameter of the second battery, the second temperature, and the operating years of the battery cell, determine the second initial safety value of the battery cell.

[0029] In the technical solution provided by step S104 of the present invention, the energy storage of the second battery, the diameter of the second battery, the second temperature and the operating years of the battery cell are calculated to obtain the second initial safety value of the battery cell.

[0030] Step S105: Collect the third temperature and air velocity at the first moment from each of the multiple monitoring points inside the battery room of the battery energy storage power station.

[0031] In the technical solution provided by step S105 of the present invention, the third temperature of each of the multiple monitoring points inside the battery room of the battery energy storage power station is collected at the first moment by a temperature sensor, and the air flow rate of each of the multiple monitoring points inside the battery room of the battery energy storage power station is obtained at the first moment by a gas flow meter.

[0032] Step S106: Determine the influencing factors of the second safety initial value based on the second temperature, the third temperature, and the air flow rate.

[0033] In the technical solution provided by step S106 of the present invention, the second temperature, the third temperature and the air flow rate are calculated to obtain the influence factor of the second safety initial value.

[0034] Step S107: Determine the target safety initial value of the battery cell based on the second safety initial value and the influence factor of the second initial value.

[0035] In the technical solution provided by step S107 of the present invention, the second initial safety value and the influence factor of the second initial value are calculated to obtain the target initial safety value of the battery cell.

[0036] Step S108: Determine the safety level of a single battery cell based on the target initial safety value.

[0037] In the technical solution provided by step S108 of the present invention, the safety level of a single battery cell is obtained based on the target initial safety value, and the safety level of the battery can be multiple levels.

[0038] Step S109: Determine the protection method for the battery cell based on its safety level.

[0039] In the technical solution provided by step S109 of the present invention, a protection method for a battery cell is obtained based on the safety level of the battery cell.

[0040] The method described in this embodiment will be further described below.

[0041] As an optional embodiment, step S102, determining the first safety value of a single battery cell based on the initial battery energy storage, initial battery diameter, and initial temperature, includes: according to a first formula. The first safety value L1 is obtained, where ρ1 is the initial battery energy, R1 is the initial battery diameter, and ω1 is the initial temperature.

[0042] In this embodiment, ρ1 is the initial battery energy, R1 is the initial battery diameter, and ω1 is the initial temperature, which are then substituted into the first formula. The first safe value is obtained.

[0043] As an optional embodiment, step S102, the initial battery diameter includes: measuring the battery diameter of each part of the marking on the battery cell; and averaging the battery diameter of each part of all markings to obtain the initial battery diameter.

[0044] In this embodiment, the diameter of the battery cell at each part of the marking is measured by a measuring device to obtain multiple battery diameters of the battery cell. The average of the battery diameters at each part of all markings is calculated to obtain the initial battery diameter, where the battery diameter at each part is a specific numerical value.

[0045] As an optional embodiment, step S104, based on the second battery storage energy, the second battery diameter, the second temperature, and the operating years of the battery cell, determines the second initial safety value of the battery cell, including: according to the second formula. The second safety value L2 is obtained, where ρ2 is the energy stored in the second battery, R2 is the diameter of the second battery, ω2 is the second temperature, and λ is the operating life of the battery cell.

[0046] In this embodiment, ρ2 is the energy stored in the second battery, R2 is the diameter of the second battery, ω2 is the second temperature, and λ is the operating life of the battery cell, which are then substituted into the second formula. The second safety value is obtained.

[0047] As an optional embodiment, step S106, determining the influencing factor of the second safety initial value based on the second temperature, the third temperature, and the air flow rate, includes: according to the third formula. The influence factor ε of the second initial safety value is obtained, where ω3 is the third temperature, ω2 is the second temperature, and v is the air velocity.

[0048] In this embodiment, ω3 is substituted into the third formula as the third temperature, ω2 as the second temperature, and v as the air velocity. In this process, the influence factor of the second initial safety value is obtained.

[0049] As an optional embodiment, step S107, determining the target safety initial value of a battery cell based on the second safety initial value and the influence factor of the second initial value, includes: determining the product between the second safety initial value and the influence factor of the second initial value as the target safety initial value.

[0050] In this embodiment, the second initial safety value and the second initial safety value are multiplied to obtain the target initial safety value.

[0051] As an optional embodiment, step S108, determining the safety level of a battery cell based on a target initial safety value, includes: matching the target initial safety value with the safety values ​​corresponding to multiple safety levels of a single battery cell to obtain the safety level of the battery cell.

[0052] In this embodiment, the target initial safety value is matched with the safety value corresponding to each of the multiple safety levels of the battery cell to obtain the safety level of the battery cell.

[0053] In this embodiment of the invention, the initial battery energy storage, initial battery diameter, and initial temperature of a battery cell in a battery storage power station before packaging are obtained. Each battery cell is numbered, and the initial temperature is the surface temperature of the battery cell. Based on the initial battery energy storage, initial battery diameter, and initial temperature, a first safety value for the battery cell is determined. When the first safety value is within a safety threshold range, the second battery energy storage, second battery diameter, and second temperature of the battery cell are measured at a first moment. Based on the second battery energy storage, second battery diameter, second temperature, and the battery cell's operating years, a second initial safety value for the battery cell is determined. A third temperature and airflow velocity are collected at a first moment from multiple monitoring points inside the battery compartment of the battery storage power station. Based on the second and third temperatures... This method determines the influencing factors of the second initial safety value based on airflow velocity and the second initial safety value; based on the second initial safety value and the influencing factors, it determines the target initial safety value of the battery cell; based on the target initial safety value, it determines the safety level of the battery cell; and based on the safety level of the battery cell, it determines the protection method for the battery cell. This method solves the technical problem that the determination of the safety level of the battery cell in a battery energy storage power station did not consider the expansion of the battery cell itself and the airflow velocity in the battery energy storage power station space, resulting in inaccurate safety protection methods for the battery energy storage power station. It achieves the technical effect of considering numerous factors such as the expansion of the battery cell itself and the airflow velocity in the battery energy storage power station space when determining the safety level of the battery cell in a battery energy storage power station, thereby improving the accuracy of the determined safety protection methods for the battery energy storage power station.

[0054] Example 2

[0055] According to embodiments of the present invention, a safety protection system for a battery energy storage power station is also provided. It should be noted that this safety protection system for a battery energy storage power station can be used to execute the safety protection method for a battery energy storage power station described in Embodiment 1.

[0056] Figure 2 This is a structural block diagram of a battery energy storage power station safety protection system according to an embodiment of the present invention. Figure 2 As shown, a battery energy storage power station safety protection system includes: an acquisition unit, a first determination unit, a measurement unit, a second determination unit, a data acquisition unit, a third determination unit, a fourth determination unit, a fifth determination unit, and a sixth determination unit.

[0057] The acquisition unit is used to acquire the initial battery energy storage capacity, initial battery diameter and initial temperature of the battery cells of the battery energy storage power station before packaging. The battery cells are numbered and the initial temperature is the surface temperature of the battery cells.

[0058] The first determining unit is used to determine the first safety value of a single battery cell based on the initial battery energy storage, initial battery diameter, and initial temperature.

[0059] The measurement unit is used to measure the second battery energy, second battery diameter, and second temperature of a battery cell at a first moment when the first safety value is within the safety value threshold range.

[0060] The second determining unit is used to determine the second initial safety value of a battery cell based on the second battery energy storage, the second battery diameter, the second temperature, and the operating years of the battery cell.

[0061] The data acquisition unit is used to collect the third temperature and air velocity at the first moment from each of the multiple monitoring points inside the battery room of the battery energy storage power station.

[0062] The third determining unit is used to determine the influence factors of the second safety initial value based on the second temperature, the third temperature, and the air flow rate.

[0063] The fourth determining unit is used to determine the target safety initial value of a battery cell based on the second safety initial value and the influence factor of the second initial value.

[0064] The fifth determining unit is used to determine the safety level of a single battery cell based on the target initial safety value.

[0065] The sixth determining unit is used to determine the protection method for a battery cell based on its safety level.

[0066] Optionally, the first determining unit further includes: a first obtaining module, configured to obtain the result according to the first formula. The first safety value L1 is obtained, where ρ1 is the initial battery energy, R1 is the initial battery diameter, and ω1 is the initial temperature.

[0067] Optionally, the first determining unit further includes: a measurement module for measuring the battery diameter at each part of the marking on the battery cell; and a second obtaining module for averaging the battery diameter at each part of all markings to obtain an initial battery diameter.

[0068] Optionally, the second determining unit further includes: a third obtaining module, used to obtain according to the second formula. The second safety value L2 is obtained, where ρ2 is the energy stored in the second battery, R2 is the diameter of the second battery, ω2 is the second temperature, and λ is the operating life of the battery cell.

[0069] Optionally, the third determining unit further includes: a fourth obtaining module, used to determine the third formula. The influence factor ε of the second initial safety value is obtained, where ω3 is the third temperature, ω2 is the second temperature, and v is the air velocity.

[0070] Optionally, the fourth determining unit further includes: a first determining module, used to determine the product between the second initial safety value and the influence factors of the second initial value as the target initial safety value.

[0071] Optionally, the fifth determining unit further includes a fifth obtaining module, used to match the target safety initial value with the safety values ​​corresponding to multiple safety levels of the battery cell to obtain the safety level of the battery cell.

[0072] In this embodiment of the invention, an acquisition unit acquires the initial battery energy storage, initial battery diameter, and initial temperature of a battery cell in a battery energy storage power station before packaging, wherein the battery cell is numbered, and the initial temperature is the surface temperature of the battery cell; a first determination unit determines a first safety value for the battery cell based on the initial battery energy storage, initial battery diameter, and initial temperature; a measurement unit measures the second battery energy storage, second battery diameter, and second temperature of the battery cell at a first moment when the first safety value is within a safety value threshold range; a second determination unit determines a second initial safety value for the battery cell based on the second battery energy storage, second battery diameter, second temperature, and the battery cell's operating years; an acquisition unit acquires the third temperature and airflow velocity at a first moment from each of multiple monitoring points inside the battery compartment of the battery energy storage power station; a third determination unit, based on the first... The system comprises six units: a second unit (temperature, temperature, and air velocity) and a third unit (air velocity). The second unit determines the influencing factors of the second initial safety value. The third unit determines the target initial safety value for each battery cell based on the second initial safety value and its influencing factors. The fourth unit determines the safety level of each battery cell based on the target initial safety value. The sixth unit determines the protection method for each battery cell based on its safety level. This system addresses the technical problem of inaccurate safety protection methods for battery cells in battery storage power stations, which were caused by neglecting to consider the cell's own expansion and the air velocity within the power station space. The system achieves the technical effect of improving the accuracy of the determined safety protection methods by considering numerous factors such as cell expansion and air velocity within the power station space when determining the battery cell's safety level.

[0073] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0074] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0075] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between units or modules may be electrical or other forms.

[0076] The units described as separate components may or may not be physically separate. Similarly, the components shown as units may or may not be physical units; they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0077] Furthermore, in the various embodiments of the present invention, the functional units can be integrated into a first processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0078] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes instructions used to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0079] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make appropriate improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A safety protection method for a battery energy storage power station, characterized in that, include: The initial battery energy storage capacity, initial battery diameter, and initial temperature of the battery cells in the battery energy storage power station before packaging are obtained, wherein the battery cells are numbered and the initial temperature is the surface temperature of the battery cells. Based on the initial battery energy storage, initial battery diameter, and initial temperature, determine the first safety value of the battery cell; When the first safety value is within the safety value threshold range, measure the second battery energy storage, second battery diameter and second temperature of the battery cell at the first moment. Based on the energy storage capacity of the second battery, the diameter of the second battery, the second temperature, and the service life of the battery cell, the second initial safety value of the battery cell is determined. The third temperature and air velocity at the first moment are collected from multiple monitoring points inside the battery room of the battery energy storage power station. Based on the second temperature, the third temperature, and the air flow rate, determine the influencing factors of the second safety initial value; Based on the second initial safety value and the influence factor of the second initial value, the target initial safety value of the battery cell is determined. Based on the target initial safety value, the safety level of the battery cell is determined; Based on the safety level of the battery cell, the protection method for the battery cell is determined.

2. The safety protection method for a battery energy storage power station according to claim 1, characterized in that, The determination of the first safety value of the battery cell based on the initial battery energy storage, initial battery diameter, and initial temperature includes: According to the first formula The first safety value L1 is obtained, where ρ1 is the initial battery energy, R1 is the initial battery diameter, and ω1 is the initial temperature.

3. The safety protection method for a battery energy storage power station according to claim 1, characterized in that, The initial battery diameter includes: Measure the diameter of the battery at each of the markings on the individual battery cells; The initial battery diameter is obtained by averaging the battery diameter at each of the marked locations.

4. The safety protection method for a battery energy storage power station according to claim 1, characterized in that, The determination of the second initial safety value for a battery cell based on the second battery storage energy, the second battery diameter, the second temperature, and the operating years of the battery cell includes: According to the second formula The second safety value L2 is obtained, where ρ2 is the energy stored in the second battery, R2 is the diameter of the second battery, ω2 is the second temperature, and λ is the operating life of the battery cell.

5. A safety protection method for a battery energy storage power station according to claim 1, characterized in that, The factors influencing the determination of the second initial safety value based on the second temperature, the third temperature, and the air velocity include: According to the third formula The influence factor ε of the second initial safety value is obtained, where ω3 is the third temperature, ω2 is the second temperature, and v is the air velocity.

6. The safety protection method for a battery energy storage power station according to claim 1, characterized in that, The determination of the target initial safety value for a single battery cell based on the second initial safety value and the influence factors of the second initial value includes: The product of the second initial safety value and the influence factor of the second initial value is determined as the target initial safety value.

7. The safety protection method for a battery energy storage power station according to claim 1, characterized in that, The process of determining the safety level of a single battery cell based on the target initial safety value includes: The target initial safety value is matched with the safety values ​​corresponding to multiple safety levels of the battery cell to obtain the safety level of the battery cell.

8. A safety protection system for a battery energy storage power station, characterized in that, include: The acquisition unit is used to acquire the initial battery energy storage capacity, initial battery diameter and initial temperature of the battery cells of the battery energy storage power station before packaging, wherein the battery cells are numbered and the initial temperature is the surface temperature of the battery cells. The first determining unit is used to determine the first safety value of a single battery cell based on the initial battery energy storage, initial battery diameter, and initial temperature. The measurement unit is used to measure the second battery energy storage, second battery diameter and second temperature of the battery cell at a first moment when the first safety value is within the safety value threshold range. The second determining unit is used to determine the second initial safety value of the battery cell based on the second battery energy storage, the second battery diameter, the second temperature and the operating years of the battery cell; The acquisition unit is used to acquire the third temperature and air velocity of each of multiple monitoring points inside the battery room of the battery energy storage power station at the first moment. The third determining unit is used to determine the influence factor of the second safety initial value based on the second temperature, the third temperature and the air flow rate; The fourth determining unit is used to determine the target initial safety value of a battery cell based on the second initial safety value and the influence factor of the second initial value; The fifth determining unit is used to determine the safety level of a single battery cell based on the target initial safety value; The sixth determining unit is used to determine the protection method for the battery cell based on the safety level of the battery cell.

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