Lithium ion battery energy storage system multi-dimensional safety performance evaluation method and system

Abstract

The invention discloses a lithium ion battery energy storage system multi-dimensional safety performance evaluation method and system. The method comprises the steps that appearance structure integrity data, temperature data, deviation angle data and ventilation quantity data of a lithium ion battery during working are collected; performing analysis according to the appearance structure integrity data, the temperature data, the deviation angle data and the ventilation quantity data to obtain corresponding analysis results; and performing safety evaluation according to the analysis result, and outputting a safety evaluation result. The method has the beneficial effects that the condition of the whole energy storage system is reflected by the condition of each battery according to the structural integrity of the lithium ion battery, the temperature of the lithium ion battery, the ventilation condition of the lithium ion battery and the placement stability condition of the lithium ion battery, so that the evaluation result is more comprehensive.

Description

Technical Field

[0001] The present invention relates to the field of lithium-ion battery energy storage technology, and in particular to a multi-dimensional safety performance evaluation method and system for a lithium-ion battery energy storage system. Background Art

[0002] With the continuous development of lithium-ion batteries and their integration technology, the application of lithium-ion battery energy storage power stations to participate in the frequency regulation of power generation control systems has gradually become a feasible solution. Compared with traditional generators, lithium-ion battery energy storage units have advantages such as fast response speed and short start and stop time, and will play an important role in the frequency regulation control of distribution network systems and smart grids.

[0003] Lithium-ion batteries generate a certain amount of heat during the charging and discharging process. Ventilation problems or external damage will cause the battery temperature to rise, and the temperature increase will affect many operating characteristic parameters of the battery. The current method of measuring the safety performance of lithium-ion battery energy storage systems only averages the temperature in one direction, which cannot accurately show the safety performance of lithium-ion battery energy storage systems. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a multi-dimensional safety performance evaluation method for a lithium-ion battery energy storage system, which accurately evaluates the safety performance of a lithium-ion battery energy storage system in multiple dimensions, and is specifically implemented by the following technical solutions:

[0005] The multi-dimensional safety performance evaluation method of the lithium-ion battery energy storage system includes:

[0006] Collect the appearance structure integrity data, temperature data, offset angle data and ventilation volume data of lithium-ion batteries during operation;

[0007] The corresponding analysis results are obtained by analyzing the appearance structure integrity data, temperature data, offset angle data and ventilation volume data respectively;

[0008] A safety evaluation is performed based on the analysis result, and a safety evaluation result is output.

[0009] The further design of the multi-dimensional safety performance evaluation method of the lithium-ion battery energy storage system is that the appearance integrity data collection process is: the image data of the initial state and the current state of the battery are collected by the camera, and the current state image data is sent to the appearance detection model to obtain the area ratio of the appearance deformation area based on the original state image data as the appearance integrity data.

[0010] The multi-dimensional safety performance evaluation method of the lithium-ion battery energy storage system is further designed to analyze the appearance structure integrity data according to formula (1):

[0011]

[0012] Among them, ω WG represents the appearance integrity analysis result, wg0 represents the threshold value of the appearance structural integrity of the lithium-ion battery, and wg n Represents the appearance integrity data of the nth lithium-ion battery, It represents the sum of the appearance structural integrity data of 1 to N lithium-ion batteries.

[0013] The multi-dimensional safety performance evaluation method of the lithium-ion battery energy storage system is further designed to analyze the temperature data according to formula (1):

[0014]

[0015] Among them, ω WD represents the temperature analysis result of the lithium-ion battery when it is working, max{WD} represents the maximum value in the temperature data set of the lithium-ion battery when it is working, wd max It indicates the maximum safety threshold of lithium-ion battery temperature. When the temperature analysis result is less than or equal to 0, a warning message is directly issued. When the temperature analysis result is greater than 0, a subsequent safety evaluation is performed.

[0016] The multi-dimensional safety performance evaluation method of the lithium-ion battery energy storage system is further designed to analyze the offset angle data according to formula (3):

[0017]

[0018] Among them, ω θ represents the deviation angle analysis result, maxθ represents the maximum value in the deviation angle data set of the lithium-ion battery during operation, It represents the sum of the deviation angles of 1 to N lithium-ion batteries during operation, θ max Indicates the maximum offset angle.

[0019] A further design of the multi-dimensional safety performance evaluation method for a lithium-ion battery energy storage system is that the process of collecting the offset angle data is as follows: collecting the distance between the bottom surface of the battery and the installation plane through a distance sensor, and using the angle data calculated based on the distance as the offset angle data.

[0020] The multi-dimensional safety performance evaluation method of the lithium-ion battery energy storage system is further designed to analyze the ventilation volume data according to formula (3):

[0021]

[0022] Among them, ω TFIt represents the ventilation analysis result when the lithium-ion battery is working, tf n Indicates the ventilation data of the nth lithium-ion battery when it is working. It indicates summing the ventilation data of 1 to N lithium-ion batteries when they are working.

[0023] The multi-dimensional safety performance evaluation method of the lithium-ion battery energy storage system is further designed to output the safety evaluation result ω according to formula (5),

[0024]

[0025] Among them, ω WG represents the appearance integrity analysis result, ω WD Represents the temperature analysis result of lithium-ion battery when it is working, ω TF represents the ventilation analysis result when the lithium-ion battery is working, ω θ represents the deviation angle analysis result, and ω represents the safety evaluation result.

[0026] The present invention also provides a multi-dimensional safety performance evaluation system for a lithium-ion battery energy storage system, the system comprising:

[0027] The lithium-ion battery data acquisition module collects the appearance structure integrity data of the lithium-ion battery when it is working through the lithium-ion battery structure integrity data acquisition unit; collects the temperature data of the lithium-ion battery when it is working through the lithium-ion battery temperature data acquisition unit; collects the ventilation volume data of the lithium-ion battery when it is working through the lithium-ion battery ventilation data acquisition unit; and collects the deviation angle of the lithium-ion battery during the working process through the lithium-ion battery placement stability data acquisition unit;

[0028] A lithium-ion battery data analysis module obtains corresponding analysis results according to the appearance structure integrity data, temperature data, ventilation volume data and offset angle;

[0029] The lithium-ion battery energy storage safety evaluation module calculates the safety evaluation results based on the analysis results.

[0030] The present invention also provides a computer-readable storage medium, which stores a computer program. The computer program is executed by a processor to implement the multi-dimensional safety performance evaluation method of the lithium-ion battery energy storage system.

[0031] The advantages of the present invention are as follows:

[0032] The multi-dimensional safety performance evaluation method for a lithium-ion battery energy storage system of the present invention comprehensively reflects the situation of the overall energy storage system through the situation of each battery by analyzing the structural integrity, temperature, ventilation and placement stability of the lithium-ion battery, thereby finally obtaining a safety evaluation result. The closer the safety evaluation result is to 1, the higher the safety of the lithium-ion energy storage battery is, and the closer it is to 0, the lower the safety of the lithium-ion energy storage battery is, thereby realizing a multi-dimensional safety performance evaluation of the lithium-ion battery energy storage system. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is described in detail below.

[0034] Embodiment 1

[0035] The multi-dimensional safety performance evaluation method of the lithium-ion battery energy storage system of this embodiment includes: firstly collecting the appearance structure integrity data, temperature data, offset angle data and ventilation volume data of the lithium-ion battery when it is working. Then, the appearance structure integrity data, temperature data, offset angle data and ventilation volume data are analyzed to obtain corresponding analysis results. Finally, a safety evaluation is performed according to the analysis results, and the safety evaluation results are output.

[0036] In this embodiment, the appearance integrity data collection process is: collect image data of the initial state and current state of the battery through a camera, and send the current state image data to the appearance detection model to obtain the area ratio of the appearance deformation area based on the original state image data as the appearance integrity data.

[0037] In this embodiment, the process of collecting the offset angle data is as follows: collecting the distance between the bottom surface of the battery and the mounting plane through a distance sensor, and using the angle data calculated based on the distance as the offset angle data.

[0038] In this embodiment, the ventilation volume data is collected by a wind speed sensor; the temperature data is collected by a temperature sensor.

[0039] According to formula (1), the appearance structure integrity data is analyzed.

[0040]

[0041] Among them, ω WG Indicates the appearance integrity analysis result. wg0 indicates the threshold of the appearance structural integrity of the lithium-ion battery, ranging from 0 to 1. n Represents the appearance structural integrity data of the nth lithium-ion battery, It represents the sum of the appearance structural integrity data of 1 to N lithium-ion batteries.

[0042] According to formula (1), the temperature data is analyzed.

[0043]

[0044] Among them, ω WD represents the temperature analysis result of the lithium-ion battery when it is working, max{WD} represents the maximum value in the temperature data set of the lithium-ion battery when it is working, wd max It indicates the maximum safety threshold of lithium-ion battery temperature. When the temperature analysis result is less than or equal to 0, a warning message is directly issued. When the temperature analysis result is greater than 0, a subsequent safety evaluation is performed.

[0045] According to formula (3), the offset angle data is analyzed.

[0046]

[0047] Among them, ω θ represents the deviation angle analysis result, maxθ represents the maximum value in the deviation angle data set of the lithium-ion battery during operation, It represents summing the deviation angles of 1 to N lithium-ion batteries during operation.

[0048] According to formula (3), the ventilation volume data is analyzed.

[0049]

[0050] Among them, ω TF It represents the ventilation analysis result when the lithium-ion battery is working, tf n Indicates the ventilation data of the nth lithium-ion battery when it is working. It indicates summing the ventilation data of 1 to N lithium-ion batteries when they are working.

[0051] According to formula (5), the safety evaluation result ω is output.

[0052]

[0053] Among them, ω WG represents the appearance integrity analysis result, ω WD Represents the temperature analysis result of lithium-ion battery when it is working, ω TF represents the ventilation analysis result when the lithium-ion battery is working, ω θ represents the deviation angle analysis result, and ω represents the safety evaluation result.

[0054] The multi-dimensional safety performance evaluation method for the lithium-ion battery energy storage system of this embodiment comprehensively reflects the situation of the overall energy storage system through the situation of each battery through the structural integrity, temperature, ventilation and stability of the lithium-ion battery, thereby finally obtaining a safety evaluation result. The closer the safety evaluation result is to 1, the higher the safety of the lithium-ion energy storage battery is, and the closer it is to 0, the lower the safety of the lithium-ion energy storage battery is, thereby realizing a multi-dimensional safety performance evaluation of the lithium-ion battery energy storage system.

[0055] Embodiment 2

[0056] This embodiment provides a multi-dimensional safety performance evaluation system for a lithium-ion battery energy storage system. The system mainly consists of: a lithium-ion battery data acquisition module, a lithium-ion battery data analysis module and a lithium-ion battery energy storage safety evaluation module.

[0057] The lithium-ion battery data acquisition module includes a lithium-ion battery structure integrity data acquisition unit, a lithium-ion battery temperature data acquisition unit, a lithium-ion battery ventilation data acquisition unit and a lithium-ion battery placement stability data acquisition unit. The lithium-ion battery structure integrity data acquisition unit is used to collect the appearance structure integrity data of the lithium-ion battery when it is working. n ,…,wg N ], the lithium-ion battery temperature data acquisition unit is used to collect the temperature data of the lithium-ion battery during operation WD = [wd1,…,wd n ,…,wd N ], the lithium-ion battery ventilation data acquisition unit is used to collect the ventilation volume data of the lithium-ion battery when it is working TF = [tf1,…,tf n ,…,tf N ], the lithium-ion battery is placed stably. The data acquisition unit is used to read the offset angle of the lithium-ion battery during operation. θ=[θ1,…,θ n ,…,θ N ], the lithium-ion battery data acquisition module sends the collected appearance structure integrity data, lithium-ion battery working temperature data, lithium-ion battery working ventilation data and offset angle during the working process to the lithium-ion battery data analysis module; where WG represents the appearance structure integrity data set, wg1,…,wg n ,…,wg N They represent the appearance and structure integrity data of the first lithium-ion battery, ..., the appearance and structure integrity data of the nth lithium-ion battery, ..., the appearance and structure integrity data of the Nth lithium-ion battery, respectively. WD represents the temperature data set of the lithium-ion battery during operation. wd1, ..., wd n ,…,wd NThey represent the collected temperature data of the first lithium-ion battery when it is working, ..., the temperature data of the nth lithium-ion battery when it is working, ..., the temperature data of the Nth lithium-ion battery when it is working. TF represents the lithium-ion battery ventilation data set, tf1, ..., tf n ,…,tf N They represent the ventilation data of the first lithium-ion battery when it is working, ..., the ventilation data of the nth lithium-ion battery when it is working, ..., the ventilation data of the Nth lithium-ion battery when it is working. The ventilation volume data represents the air volume discharged by the cooling system of the lithium-ion battery during normal working period, which is used to measure whether the heat dissipation area of ​​the lithium-ion battery is blocked by dust. The ventilation data of the nth lithium-ion battery when it is working tf n The expression is as follows:

[0058]

[0059] Among them, μ0 represents the rated ventilation volume, μ n Indicates the ventilation volume of the nth lithium-ion battery when it is working, tf n represents the ventilation data of the nth lithium-ion battery during operation, θ represents the offset angle data set during the operation of the lithium-ion battery, θ1,…,θ n ,…,θ N They respectively represent the collected deviation angles of the first lithium-ion battery during operation, ..., the deviation angles of the nth lithium-ion battery during operation, ..., the deviation angles of the Nth lithium-ion battery during operation.

[0060] The lithium-ion battery data analysis module is mainly composed of a lithium-ion battery structural integrity data analysis unit, a lithium-ion battery temperature data analysis unit, a lithium-ion battery ventilation data analysis unit, and a lithium-ion battery placement stability data analysis unit. The lithium-ion battery structural integrity data analysis unit performs analysis based on the appearance structural integrity data and obtains the appearance integrity analysis results. When the appearance integrity analysis result is closer to 1, it means that the appearance is more complete. When the appearance integrity analysis result is closer to 0, it means that the appearance is more incomplete. The lithium-ion battery temperature data analysis unit analyzes the temperature data of the lithium-ion battery when it is working and obtains the temperature analysis result of the lithium-ion battery when it is working. When the temperature analysis result is closer to 1 when the lithium-ion battery is working, the safer the working condition is. When the temperature analysis result is closer to 0 when the lithium-ion battery is working, the less safe the working condition is. When the lithium-ion battery temperature data analysis unit calculates that the temperature analysis result of the lithium-ion battery is less than or equal to 0, the lithium-ion battery energy storage safety evaluation module is directly skipped to send an early warning message to the management personnel. When the lithium-ion battery temperature data analysis unit calculates that the temperature analysis result of the lithium-ion battery is greater than 0 when the lithium-ion battery is working, the analysis result is directly sent to the lithium-ion battery energy storage safety evaluation module. The lithium-ion battery ventilation data analysis unit analyzes the ventilation data of the lithium-ion battery when it is working, and obtains the ventilation analysis result of the lithium-ion battery when it is working. When the lithium-ion battery is working, the closer the ventilation analysis result is to 1, the less dust there is in the working ventilation area. When the lithium-ion battery is working, the closer the ventilation analysis result is to 0, the more dust there is in the working ventilation area. The lithium-ion battery placement stability data analysis unit is based on the offset angle during the working process, and the offset angle analysis result is obtained. The larger the deviation of the angle analysis result, that is, the closer the result is to 0, the larger the deviation angle is, which means that the insulating support layer or rubber support part in the support element is aged and damaged, which may cause deviation in the future. The closer the result is to 1, the safer the support is. max Indicates the maximum offset angle. The lithium-ion battery data analysis module sends the appearance integrity analysis results, the temperature analysis results when the lithium-ion battery is working, the ventilation analysis results when the lithium-ion battery is working, and the offset angle analysis results to the lithium-ion battery energy storage safety evaluation module.

[0061] The lithium-ion battery energy storage safety evaluation module outputs the safety evaluation result based on the analysis result in the lithium-ion battery data analysis module. The expression of the safety evaluation result output by the lithium-ion battery energy storage safety evaluation module based on the analysis result in the lithium-ion battery data analysis module is as follows:

[0062]

[0063] Among them, ω WG represents the appearance integrity analysis result, ω WD Represents the temperature analysis result of lithium-ion battery when it is working, ω TF represents the ventilation analysis result when the lithium-ion battery is working, ω θ represents the result of the offset angle analysis, ω represents the safety evaluation result, and the closer the final safety evaluation result is to 1, the higher the safety of the lithium-ion energy storage battery is, and the closer it is to 0, the lower the safety of the lithium-ion energy storage battery is.

[0064] Embodiment 3

[0065] The present invention provides a computer-readable storage medium, characterized in that the storage medium stores a computer program, and the computer program is executed by a processor to implement the multi-dimensional safety performance evaluation method of a lithium-ion battery energy storage system.

[0066] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A multi-dimensional safety performance evaluation method for a lithium-ion battery energy storage system, characterized in that include: Collect the appearance structure integrity data, temperature data, offset angle data and ventilation volume data of lithium-ion batteries during operation; The corresponding analysis results are obtained by analyzing the appearance structure integrity data, temperature data, offset angle data and ventilation volume data respectively; A safety evaluation is performed based on the analysis result, and a safety evaluation result is output.

2. The multi-dimensional safety performance evaluation method for lithium-ion battery energy storage system according to claim 1 is characterized in that The appearance integrity data collection process is: collecting image data of the initial state and current state of the battery through a camera, and sending the current state image data to the appearance detection model to obtain the area ratio of the appearance deformation area based on the original state image data as the appearance integrity data.

3. The multi-dimensional safety performance evaluation method for lithium-ion battery energy storage system according to claim 2 is characterized in that According to formula (1), the appearance structure integrity data is analyzed. Among them, ω WG represents the appearance integrity analysis result, wg0 represents the threshold value of the appearance structural integrity of the lithium-ion battery, and wg n Represents the appearance integrity data of the nth lithium-ion battery, It represents the sum of the appearance structural integrity data of 1 to N lithium-ion batteries.

4. The multi-dimensional safety performance evaluation method for lithium-ion battery energy storage system according to claim 3 is characterized in that According to formula (1), the temperature data is analyzed. Among them, ω WD represents the temperature analysis result of the lithium-ion battery when it is working, max{WD} represents the maximum value in the temperature data set of the lithium-ion battery when it is working, wd max Indicates the maximum safety threshold of lithium-ion battery temperature, When the temperature analysis result is less than or equal to 0, a warning message is directly issued. When the temperature analysis result is greater than 0, a subsequent safety evaluation is performed.

5. The multi-dimensional safety performance evaluation method for lithium-ion battery energy storage system according to claim 4 is characterized in that According to formula (3), the offset angle data is analyzed. Among them, ω θ represents the deviation angle analysis result, maxθ represents the maximum value in the deviation angle data set of the lithium-ion battery during operation, It represents the sum of the deviation angles of 1 to N lithium-ion batteries during operation, θ max Indicates the maximum offset angle.

6. The multi-dimensional safety performance evaluation method for lithium-ion battery energy storage system according to claim 5 is characterized in that The process of collecting the offset angle data is as follows: collecting the distance between the bottom surface of the battery and the mounting plane through the distance sensor, and using the angle data calculated based on the distance as the offset angle data.

7. The multi-dimensional safety performance evaluation method for lithium-ion battery energy storage system according to claim 6 is characterized in that According to formula (3), the ventilation volume data is analyzed. Among them, ω TF It represents the ventilation analysis result when the lithium-ion battery is working, tf n Indicates the ventilation data of the nth lithium-ion battery when it is working. It indicates summing the ventilation data of 1 to N lithium-ion batteries when they are working.

8. The multi-dimensional safety performance evaluation method for lithium-ion battery energy storage system according to claim 7 is characterized in that According to formula (5), the safety evaluation result ω is output. Among them, ω WG represents the appearance integrity analysis result, ω WD Represents the temperature analysis result of lithium-ion battery when it is working, ω TF represents the ventilation analysis result when the lithium-ion battery is working, ω θ represents the deviation angle analysis result, and ω represents the safety evaluation result.

9. A multi-dimensional safety performance evaluation system for a lithium-ion battery energy storage system using the multi-dimensional safety performance evaluation method for a lithium-ion battery energy storage system according to any one of claims 1 to 8, characterized in that The system comprises: a lithium-ion battery data acquisition module, which collects the appearance structure integrity data of the lithium-ion battery when it is working through a lithium-ion battery structure integrity data acquisition unit; collects the temperature data of the lithium-ion battery when it is working through a lithium-ion battery temperature data acquisition unit; collects the ventilation volume data of the lithium-ion battery when it is working through a lithium-ion battery ventilation data acquisition unit; and collects the deviation angle of the lithium-ion battery during the working process through a lithium-ion battery placement stability data acquisition unit; A lithium-ion battery data analysis module obtains corresponding analysis results according to the appearance structure integrity data, temperature data, ventilation volume data and offset angle; The lithium-ion battery energy storage safety evaluation module calculates the safety evaluation results based on the analysis results.

10. A computer-readable storage medium, characterized in that The storage medium stores a computer program, and the computer program is executed by a processor to implement the multi-dimensional safety performance evaluation method for a lithium-ion battery energy storage system according to any one of claims 1 to 8.

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