Energy storage security monitoring system and method for energy storage power station

Abstract

The application provides a kind of energy storage security monitoring system and method of energy storage power station, it is related to energy storage security technical field, comprising: continuously collecting the battery temperature data and battery voltage data of each energy storage object of each battery level;According to each battery temperature data and each battery voltage data processing respectively, obtain the multiple energy storage safety indexes of each energy storage object;According to each energy storage safety index, the battery safety score of each energy storage object is calculated respectively;For each battery level, according to the battery safety score of each energy storage object contained respectively, the step energy storage security early warning is carried out.Have beneficial effect is from four dimensions to carry out the safety state rating of battery, can locate the minimum implementation unit of security measure, reduce security cost;The proportion of standard deviation is configured weight to calculate battery safety score, can distinguish battery state better;According to battery safety score, step energy storage security early warning is carried out, prevent the state misjudgment caused by communication, consume security resources.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage safety, and particularly relates to an energy storage safety monitoring system and method for an energy storage power station. BACKGROUND

[0002] If various unexpected factors such as external exposure to open flames, impact, lightning short circuit, overcharge or overdischarge occur in the charging and discharging process of the storage battery, there is a risk of fire and explosion, for example, the storage battery causes the temperature of the equipment to be too high due to overvoltage or overcurrent, forming an ignition source; the temperature of the battery electrolyte rises, and the heat exchange system fails to cause the equipment to operate at high temperature, such as blocked air ducts, damaged fans, improper installation position, excessively high ambient temperature or too close distance to external heat source, which can cause poor heat dissipation of the storage battery system, affect the safe operation of the equipment, and cause a fire.

[0003] The traditional energy storage safety monitoring usually only evaluates the safety state of the battery from a single dimension such as the battery cell or the battery cluster, and when the battery in this dimension is monitored to be abnormal, the other battery levels associated with this dimension in the actual energy storage power station have already appeared safety problems, so that the scheme cannot accurately locate the minimum security unit at which battery level; in addition, the calculation of the traditional battery safety score usually gives the main consistency indicators of the battery a weight set by human experience, and the subjective factor of this weight set by human experience is too large, which often cannot distinguish different safety states; further, when the traditional state evaluation based on the battery safety score is performed, a battery state is usually determined by giving a corresponding score range, without considering the change process of the battery state. However, the electrochemical characteristics of the battery determine that if the battery appears a serious abnormality, each indicator of the battery must be slowly increasing and cannot be suddenly changed, so if a serious abnormality occurs, the safety state of the battery must be gradually serious. However, actual data sampling may cause communication abnormality to cause data error transmission, and if the traditional score range is used for evaluation, misjudgment may occur due to the lack of consideration of the time-varying characteristics of the state. SUMMARY

[0004] In view of the problems in the prior art, the present application provides an energy storage safety monitoring system for an energy storage power station, wherein the energy storage power station comprises a plurality of battery levels from top to bottom, and each battery level comprises a plurality of energy storage objects; the energy storage safety monitoring system comprises:

[0005] A data acquisition module is configured to continuously acquire battery temperature data and battery voltage data of each energy storage object in each battery level.

[0006] A data processing module is connected to the data acquisition module and is configured to process a plurality of energy storage safety indicators of each energy storage object according to the battery temperature data and the battery voltage data of each energy storage object, respectively.

[0007] a security score calculation module connected to the data processing module, configured to calculate a battery security score of each energy storage object according to each energy storage security indicator;

[0008] a monitoring and early warning module connected to the security score calculation module, configured to perform a step-by-step energy storage security early warning for each battery level according to the battery security score of each energy storage object contained in the battery level.

[0009] Preferably, the security score calculation module comprises:

[0010] a standardization processing unit configured to perform unified dimension processing on each energy storage security indicator corresponding to each battery level to obtain a standardized security indicator;

[0011] a weight configuration unit connected to the standardization processing unit, configured to calculate, for each battery level, a standard deviation of each standardized security indicator corresponding to each energy storage object contained in the battery level, and take the proportion of the standard deviation of each standardized security indicator in the total of the standard deviations of all standardized security indicators as the weight of the standardized security indicator;

[0012] a score calculation unit connected to the standardization processing unit and the weight configuration unit, configured to calculate, for each energy storage object, the battery security score of the energy storage object according to each standardized security indicator and the corresponding weight.

[0013] Preferably, the score calculation unit comprises:

[0014] a standardization subunit configured to, for each energy storage object, obtain a summation score by weighted summation of each standardized security indicator and the corresponding weight, and perform standard normal processing on the summation score to obtain a corresponding standard security score;

[0015] a mapping subunit connected to the standardization subunit, configured to map the absolute value of the standard security score to a preset score range to obtain the battery security score.

[0016] Preferably, the step-by-step energy storage security early warning comprises a first early warning, a second early warning and a third early warning distributed in a step-by-step manner; and the monitoring and early warning module comprises:

[0017] an extraction unit configured to extract, for each battery level, a first early warning threshold and a second early warning threshold from the battery security score of each energy storage object contained in the battery level;

[0018] a first early warning unit connected to the extraction unit, configured to output a first early warning prompt representing the first-level early warning when the battery safety score is less than the first early warning threshold and greater than the second early warning threshold;

[0019] a second early warning unit connected to the first early warning unit, configured to maintain output of the first early warning prompt representing the first-level early warning when a first duration during which the battery safety score is less than the first early warning threshold and greater than the second early warning threshold does not reach a first preset time period, and output a second early warning prompt representing the second-level early warning and cut off power supply of the corresponding energy storage object when the first duration reaches the first preset time period;

[0020] a third early warning unit connected to the second early warning unit, configured to maintain output of the second early warning prompt representing the second-level early warning and cut off power supply of the corresponding energy storage object when a second duration during which the battery safety score is less than the first early warning threshold and greater than the second early warning threshold does not reach a second preset time period, and output a third early warning prompt representing the third-level early warning, cut off power supply of the corresponding energy storage object and control a fire sprinkler device in a region where the energy storage object is located to start when the second duration reaches the second preset time period;

[0021] a fourth early warning unit connected to the extraction unit, configured to output the second early warning prompt representing the second-level early warning when the battery safety score is not greater than the second early warning threshold;

[0022] a fifth early warning unit connected to the fourth early warning unit, configured to maintain output of the second early warning prompt representing the second-level early warning when a third duration during which the battery safety score is not greater than the second early warning threshold does not reach a third preset time period, and output the third early warning prompt representing the third-level early warning and cut off power supply of the corresponding energy storage object when the third duration reaches the third preset time period.

[0023] Preferably, in the extraction unit, the 90th percentile of each battery safety score corresponding to each energy storage object contained in each battery level is extracted as the first early warning threshold, and the upper quartile of each battery safety score is extracted as the second early warning threshold.

[0024] Preferably, each battery level includes, from top to bottom, a battery stack level, a battery cluster level, a battery module level and a battery cell level.

[0025] The cell level takes a single cell as the energy storage object; the battery module level takes a plurality of single cells contained as the energy storage object; the battery cluster level takes a plurality of battery modules contained as the energy storage object; and the battery stack level takes a plurality of battery clusters contained as the energy storage object.

[0026] Preferably, in the cell level, each of the energy storage safety indicators includes a cell temperature, a cell temperature change rate and a cell voltage change rate of the single cell.

[0027] In the battery module level, each of the energy storage safety indicators includes a voltage range, a voltage standard deviation and a temperature range of each of the single cells contained, and a voltage change rate, a temperature and a temperature change rate of the battery module.

[0028] In the battery cluster level, each of the energy storage safety indicators includes a voltage range, a voltage standard deviation and a temperature range of each of the battery modules contained, and a voltage change rate, a temperature and a temperature change rate of the battery cluster.

[0029] In the battery stack level, each of the energy storage safety indicators includes a voltage range, a voltage standard deviation and a temperature range of each of the battery clusters contained, and a voltage change rate, a temperature and a temperature change rate of the battery stack.

[0030] The application further provides an energy storage safety monitoring method of an energy storage power station, applied to the energy storage safety monitoring system.

[0031] In step S1, the energy storage safety monitoring system continuously collects battery temperature data and battery voltage data of each of the energy storage objects of each of the battery levels.

[0032] In step S2, the energy storage safety monitoring system respectively processes the battery temperature data and the battery voltage data to obtain a plurality of energy storage safety indicators of each of the energy storage objects.

[0033] In step S3, the energy storage safety monitoring system respectively calculates battery safety scores of each of the energy storage objects according to the energy storage safety indicators.

[0034] In step S4, the energy storage safety monitoring system respectively performs stepwise energy storage safety early warning according to the battery safety scores of each of the energy storage objects contained for each of the battery levels.

[0035] Preferably, the step S3 includes:

[0036] In step S31, the energy storage safety monitoring system uniformly processes the energy storage safety indicators corresponding to each of the battery levels to obtain standardized safety indicators.

[0037] Step S32, the energy storage safety monitoring system calculates the standard deviation of each standardized safety indicator corresponding to each energy storage object included in each battery level, and takes the proportion of the standard deviation of each standardized safety indicator in the total sum of the standard deviations of all standardized safety indicators as the weight of the standardized safety indicator;

[0038] Step S33, the energy storage safety monitoring system processes the battery safety score of each energy storage object according to each standardized safety indicator and the corresponding weight.

[0039] Preferably, the step S4 includes:

[0040] Step S41, the energy storage safety monitoring system extracts a first warning threshold and a second warning threshold from each battery safety score corresponding to each energy storage object included in each battery level;

[0041] Step S42, the energy storage safety monitoring system determines whether the battery safety score is less than the first warning threshold:

[0042] If not, return to step S42;

[0043] If yes, go to step S43;

[0044] Step S43, the energy storage safety monitoring system determines whether the battery safety score is greater than the second warning threshold:

[0045] If yes, go to step S44;

[0046] If not, output the second warning prompt representing the second warning, and cut off the power supply of the corresponding energy storage object, and then go to step S48;

[0047] Step S44, the energy storage safety monitoring system outputs the first warning prompt representing the first warning, and then goes to step S45;

[0048] Step S45, the energy storage safety monitoring system determines whether the first duration during which the battery safety score is less than the first warning threshold and greater than the second warning threshold after outputting the first warning prompt reaches a first preset period:

[0049] If not, return to step S44;

[0050] If yes, go to step S46;

[0051] Step S46, the energy storage safety monitoring system outputs the second warning prompt representing the secondary early warning, and cuts off the power supply of the corresponding energy storage object;

[0052] Step S47, the energy storage safety monitoring system determines whether a second duration, during which the battery safety score is less than the first warning threshold and greater than the second warning threshold after outputting the second warning prompt, reaches a second preset time period:

[0053] If not, return to step S46;

[0054] If yes, output a third warning prompt representing the tertiary early warning, cut off the power supply of the corresponding energy storage object, control start the fire sprinkler device in the area where the energy storage object is located, and then exit;

[0055] Step S48, the energy storage safety monitoring system determines whether a third duration, during which the battery safety score is not greater than the second warning threshold after outputting the second warning prompt, reaches a third preset time period:

[0056] If not, keep outputting the second warning prompt representing the secondary early warning, and cut off the power supply of the corresponding energy storage object;

[0057] If yes, output the third warning prompt representing the tertiary early warning, and cut off the power supply of the corresponding energy storage object while controlling start the fire sprinkler device in the area where the energy storage object is located.

[0058] The above technical solution has the following advantages or beneficial effects:

[0059] 1) The safety state of the battery is rated from four dimensions of cell level, battery module level, battery cluster level and battery stack level, which can locate the minimum implementation unit of the security measure, reduce the security cost, and improve the security efficiency;

[0060] 2) The standard deviation is configured with a weight to calculate the battery safety score, which avoids the subjective influence of manually configuring the weight, and can better distinguish the battery state;

[0061] 3) The ladder type energy storage safety early warning is performed according to the battery safety score, which can continuously record the step-by-step change of the early warning level of the battery, ensure that the battery state gradually becomes serious, prevent the state misjudgment caused by communication, and consume the security resources. BRIEF DESCRIPTION OF DRAWINGS

[0062] Figure 1 In a preferred embodiment of the present application, a structure diagram of an energy storage safety monitoring system of an energy storage power station is provided.

[0063] Figure 2For the preferred embodiment of the present application, a flowchart of a storage energy safety monitoring method of a storage energy power station is provided.

[0064] Figure 3 For the preferred embodiment of the present application, a flowchart of a sub-process of step S3 is provided.

[0065] Figure 4 For the preferred embodiment of the present application, a flowchart of a sub-process of step S4 is provided. DETAILED DESCRIPTION

[0066] The present application will be described in detail below with reference to the accompanying drawings and specific embodiments. The present application is not limited to this embodiment, and other embodiments that meet the spirit of the present application can also fall within the scope of the present application.

[0067] For the preferred embodiment of the present application, based on the above-mentioned problems existing in the prior art, a storage energy safety monitoring system of a storage energy power station is provided, which includes a plurality of battery levels from top to bottom, and each battery level includes a plurality of storage energy objects. Figure 1 As shown, the storage energy safety monitoring system includes:

[0068] A data acquisition module 1 is configured to continuously acquire battery temperature data and battery voltage data of each storage energy object of each battery level.

[0069] A data processing module 2 is connected to the data acquisition module 1 and is configured to process each storage energy object based on each battery temperature data and each battery voltage data to obtain a plurality of storage energy safety indicators.

[0070] A safety score calculation module 3 is connected to the data processing module 2 and is configured to calculate a battery safety score of each storage energy object based on each storage energy safety indicator.

[0071] A monitoring and early warning module 4 is connected to the safety score calculation module 3 and is configured to perform a step-by-step storage energy safety early warning based on the battery safety score of each storage energy object contained in each battery level.

[0072] Specifically, in the present embodiment, each battery level includes, from top to bottom, a battery stack level, a battery cluster level, a battery module level, and a cell level, wherein the battery stack level includes a plurality of battery stacks, each battery stack includes a plurality of battery clusters connected in series and in parallel, and each battery cluster is taken as a storage energy object; the battery cluster level includes a plurality of battery clusters, each battery cluster includes a plurality of battery modules connected in series and in parallel, and each battery module is taken as a storage energy object; the battery module level includes a plurality of battery modules, each battery module includes a plurality of battery cells connected in series and in parallel, and each single battery cell is taken as a storage energy object; and the cell level takes a single battery cell as a storage energy object.

[0073] Preferably, each single battery cell has a preset battery cell unique code, the battery module to which the single battery cell belongs has a preset module unique code, the battery cluster to which the battery module belongs has a preset cluster unique code, and the battery stack to which the battery cluster belongs has a preset stack unique code.

[0074] For the single battery cell in the battery cell level, the battery temperature data and the battery voltage data are continuously collected, wherein the battery temperature data and the battery voltage data include the battery cell temperature, the battery cell voltage, the preset battery cell unique code of the single battery cell, and the module unique code of the battery module to which the single battery cell belongs at the current collection time. Thus, the battery cell temperature change rate is obtained according to the battery cell temperature at the current collection time and the battery cell temperature at the last collection time, and the battery cell voltage change rate is obtained according to the battery cell voltage at the current collection time and the battery cell voltage at the last collection time, and then the battery cell temperature, the battery cell temperature change rate, and the battery cell voltage change rate of the single battery cell are taken as the energy storage safety indicators at the battery cell level to participate in the calculation of the battery safety score of the single battery cell.

[0075] For the battery module level, the collected battery temperature data and battery voltage data include the module temperature and the module voltage associated with the module unique code of each battery module and the cluster unique code of the battery cluster to which the battery module belongs, and the battery cell temperature and the battery cell voltage of each single battery cell included in the battery module, so that the temperature change rate and the voltage change rate of the battery module are obtained according to the module temperature and the module voltage of the battery module at the current collection time and the module temperature and the module voltage at the last collection time, respectively, and the voltage standard deviation, the voltage range, and the temperature range are obtained according to the battery cell temperature and the battery cell voltage of each single battery cell included in the battery module, and then the voltage range, the voltage standard deviation, and the temperature range of each single battery cell, and the voltage change rate, the temperature, and the temperature change rate of the battery module are taken as the energy storage safety indicators at the battery module level to participate in the calculation of the battery safety score of the battery module.

[0076] The processing method of the energy storage safety indicators at the battery cluster module level and the battery stack level is the same as that at the battery module level, and the specific process is not described here.

[0077] Preferably, the above-mentioned battery temperature data and battery voltage data can be collected by the battery BMS and the additionally arranged data collection device. It can be understood that the battery temperature data and the battery voltage data that cannot be directly obtained by the BMS can be realized by correspondingly arranging temperature collection devices and voltage collection devices. After data collection, the original battery temperature data and the battery voltage data are subjected to abnormal data removal or correction processing, so as to ensure the accuracy of the processed energy storage safety indicators, and then ensure the accuracy of the subsequent battery safety state evaluation.

[0078] After obtaining the energy storage safety indicators of each battery level, the battery safety score can be further calculated by the safety score calculation module 3. In the preferred embodiment of the application, the safety score calculation module 3 comprises:

[0079] The standardization processing unit 31 is configured to uniformly process the energy storage safety indicators corresponding to each battery level to obtain standardized safety indicators.

[0080] The weight configuration unit 32 is connected to the standardization processing unit 31 and is configured to calculate the standard deviation of each standardized safety indicator corresponding to each energy storage object included in each battery level, and take the proportion of the standard deviation of each standardized safety indicator in the total of the standard deviations of all standardized safety indicators as the weight of the standardized safety indicator.

[0081] The score calculation unit 33 is connected to the standardization processing unit 31 and the weight configuration unit 32 and is configured to calculate the battery safety score of each energy storage object according to the standardized safety indicators and the corresponding weights.

[0082] Specifically, since the dimensions of the energy storage safety indicators are not uniform, some energy storage safety indicators with large dimensions may be over-considered when calculating the battery safety score. In this embodiment, the energy storage safety indicators are first standardized before calculating the battery safety score. Considering that some energy storage safety indicators, such as temperature range, may have 0 values, the traditional normalization processing cannot be used, and the normal standardization processing is preferably used. The specific formula of the normal standardization processing is as follows:

[0083]

[0084] wherein A new represents the standardized safety indicator, A represents the energy storage safety indicator, μ A represents the mean of the corresponding standardized safety indicator, and δ A represents the standard deviation of the corresponding standardized safety indicator.

[0085] The weight of a certain standardized safety indicator is calculated according to the following formula:

[0086]

[0087] wherein w A represents the weight of the standardized safety indicator, std A represents the standard deviation of the standardized safety indicator, and ∑std represents the sum of the standard deviations of all standardized safety indicators corresponding to the battery level.

[0088] Taking a single cell as an example, the standardized safety indicators include the standardized cell temperature, the cell temperature change rate and the cell voltage change rate, and then the first standard deviation of the cell temperature, the second standard deviation of the cell temperature change rate and the third standard deviation of the cell voltage change rate are calculated respectively, and the weight of the cell temperature is the first standard deviation / (the second standard deviation+the third standard deviation), and the calculation methods of other weights are similar. It can be seen that based on the normal standardization, the greater the standard deviation, the greater the discrimination, and the greater the corresponding weight configuration, the weight is configured by the proportion of the standard deviation, and then the battery safety score is calculated, which can better distinguish the battery state and avoid the subjective influence of artificial weight configuration.

[0089] Further, based on the standardized safety indicators and the corresponding weights, the battery safety score of the energy storage object can be processed, and in a preferred embodiment of the application, the score calculation unit 33 includes:

[0090] The standardization subunit 331 is configured to, for each energy storage object, perform weighted summation on the basis of the standardized safety indicators and the corresponding weights to obtain a summation score, and perform standard normalization processing on the summation score to obtain a corresponding standard safety score.

[0091] The mapping subunit 332 is connected to the standardization subunit 331 and is configured to map the absolute value of the standard safety score to a preset score range to obtain a battery safety score.

[0092] Specifically, in the embodiment, the calculation formula of the summation score is as follows:

[0093] SOS = -∑A new *w A

[0094] Wherein, A new represents the standardized safety indicator, w A represents the weight of the standardized safety indicator, and SOS represents the summation score.

[0095] To unify the evaluation standard, the summation score needs to be mapped to the same preset score range for evaluation. Before mapping, the summation score is first standardized by normalizing, and the calculation formula is as follows:

[0096]

[0097] Wherein, SOS new represents the standard safety score, SOS represents the summation score, μSOS represents the mean of the corresponding summation score, and δ SOS represents the standard deviation of the corresponding summation score.

[0098] The preset score range is preferably [0, 100], and the calculation formula for mapping the absolute value of the standard safety score into the preset score range is as follows:

[0099]

[0100] SOS = S * 100 / Smax 100 for indicating the battery safety score.

[0101] After calculating the battery safety scores of the energy storage objects in each battery level, a step-by-step safety warning can be performed based on the battery safety scores. In a preferred embodiment of the present application, the step-by-step energy storage safety warning includes a first warning, a second warning, and a third warning distributed in sequence; and the monitoring and warning module 4 includes:

[0102] The extraction unit 41 is configured to extract a first warning threshold and a second warning threshold from the battery safety scores corresponding to the energy storage objects included in each battery level;

[0103] The first warning unit 42 is connected to the extraction unit 41 and is configured to output a first warning prompt representing the first warning when the battery safety score is less than the first warning threshold and greater than the second warning threshold;

[0104] The second warning unit 43 is connected to the first warning unit 42 and is configured to, after outputting the first warning prompt, maintain the output of the first warning prompt when the first duration in which the battery safety score is less than the first warning threshold and greater than the second warning threshold does not reach a first preset time period, and output a second warning prompt representing the second warning and cut off the power supply of the corresponding energy storage object when the first duration reaches the first preset time period;

[0105] The third warning unit 44 is connected to the second warning unit 43 and is configured to, after outputting the second warning prompt, maintain the output of the second warning prompt and cut off the power supply of the corresponding energy storage object when the first duration in which the battery safety score is less than the first warning threshold and greater than the second warning threshold does not reach a second preset time period, and output a third warning prompt representing the third warning and cut off the power supply of the corresponding energy storage object while controlling to start the fire sprinkler device in the area where the energy storage object is located when the second duration reaches the second preset time period;

[0106] The fourth warning unit 45 is connected to the extraction unit 41 and is configured to output a second warning prompt representing the second warning when the battery safety score is not greater than the second warning threshold;

[0107] The fifth early warning unit 46 is connected with the fourth early warning unit 45, and is configured to, after outputting the second early warning prompt, determine whether the third duration in which the battery safety score is not greater than the second early warning threshold has not reached the third preset time period, maintain outputting the second early warning prompt representing the second-level early warning, and when it is determined that the third duration has reached the third preset time period, output a third early warning prompt representing a third-level early warning, and simultaneously control the power supply of the corresponding energy storage object and start the fire sprinkler device in the region where the energy storage object is located.

[0108] Specifically, in the embodiment, the extraction unit 41 extracts the 90th percentile of the battery safety scores corresponding to each energy storage object in each battery level as the first early warning threshold, and extracts the upper quartile of the battery safety scores as the second early warning threshold.

[0109] Taking the battery cell level as an example, the battery safety scores corresponding to each battery cell can be arranged in ascending order to form a corresponding safety score sequence, and then the 90th percentile of the safety score sequence is taken as the first early warning threshold of the battery cell level, and the upper quartile of the safety score sequence is taken as the second early warning threshold of the battery cell level. It can be seen that the first early warning threshold is greater than the second early warning threshold.

[0110] Further taking the battery module level as an example, the battery safety scores corresponding to each battery module can also be arranged in ascending order to form a corresponding safety score sequence, and then the 90th percentile of the safety score sequence is taken as the first early warning threshold of the battery module level, and the upper quartile of the safety score sequence is taken as the second early warning threshold of the battery module level. It can be seen that the first early warning threshold is greater than the second early warning threshold.

[0111] The battery cluster level and the battery stack level are similar, and will not be described here.

[0112] For each single battery cell in the battery cell level, its battery safety score is compared with the first warning threshold first, if it is not less than the first warning threshold, it is considered that the single battery cell is currently in a safe state and no intervention is needed, so no prompt is made; if it is less than the first warning threshold and greater than the second warning threshold, a first warning prompt is output, indicating that the single battery cell is in a first-level warning state, and it is considered that the battery may have certain safety risks, but no intervention is needed, and only the first warning prompt containing the unique code of the single battery cell and indicating that the battery may have certain safety risks is output. Then the single battery cell is continuously monitored, if its battery safety score is not less than the first warning threshold and greater than the second warning threshold for a first preset time period, it is considered that the battery safety state of the single battery cell has not become more serious, and the first-level warning state is continued, if its battery safety score is less than the first warning threshold and greater than the second warning threshold for a first preset time period, it is considered that the battery safety state of the single battery cell has become more serious, and a second-level warning state is entered, a second warning prompt containing the unique code of the single battery cell and indicating that the battery needs to be maintained by the maintenance personnel is output, and the power supply of the single battery cell is cut off to avoid possible dangerous events. Then the single battery cell is continuously monitored, if its battery safety score is less than the first warning threshold and greater than the second warning threshold for a second preset time period in the second-level warning state, it is considered that the battery safety state of the single battery cell continues to become more serious, and a third-level warning state is entered, a third warning prompt containing the unique code of the single battery cell and indicating that the battery needs to be maintained by the maintenance personnel is output, and the power supply of the single battery cell is cut off while the fire sprinkler device in the area where the single battery cell is located is controlled to start, to avoid possible dangerous events.

[0113] The first, second and third preset time periods can be customized according to requirements, and are preferably 1 minute.

[0114] The step-by-step warning method of the battery module level, the battery cluster level and the battery stack level is similar, which will not be described here.

[0115] In summary, through the step-by-step energy storage safety warning, the step-by-step change of the warning level of the battery can be recorded continuously, the battery state is ensured to become more serious step by step, the state misjudgment caused by communication is prevented, the security resources are consumed, and based on the unique code of the battery cell contained in the warning prompt, the minimum implementation unit of the security measure can be accurately located, the security cost is reduced, and the security efficiency is improved.

[0116] The application also provides an energy storage safety monitoring method of an energy storage power station, which is applied to the energy storage safety monitoring system. Figure 2 As shown in the figure, the energy storage safety monitoring method comprises:

[0117] Step S1, the energy storage safety monitoring system continuously collects battery temperature data and battery voltage data of each energy storage object of each battery level;

[0118] Step S2, the energy storage safety monitoring system respectively processes each battery temperature data and each battery voltage data to obtain a plurality of energy storage safety indexes of each energy storage object;

[0119] Step S3, the energy storage safety monitoring system respectively calculates a battery safety score of each energy storage object according to each energy storage safety index;

[0120] Step S4, the energy storage safety monitoring system respectively performs stepwise energy storage safety early warning on each battery level according to the battery safety scores of the energy storage objects contained in each battery level.

[0121] In a preferred embodiment of the present application, as shown in Figure 3 Step S3 includes:

[0122] Step S31, the energy storage safety monitoring system uniformly processes each energy storage safety index corresponding to each battery level to obtain a standardized safety index;

[0123] Step S32, the energy storage safety monitoring system respectively calculates the standard deviation of each standardized safety index corresponding to each energy storage object contained in each battery level, and takes the proportion of the standard deviation of each standardized safety index in the total sum of the standard deviations of all standardized safety indexes as the weight of the standardized safety index;

[0124] Step S33, the energy storage safety monitoring system processes the battery safety score of each energy storage object according to each standardized safety index and the corresponding weight.

[0125] In a preferred embodiment of the present application, the stepwise energy storage safety early warning includes a first early warning, a second early warning and a third early warning distributed in turn; as shown in Figure 4 Step S4 includes:

[0126] Step S41, the energy storage safety monitoring system extracts a first early warning threshold and a second early warning threshold from the battery safety scores corresponding to the energy storage objects contained in each battery level;

[0127] Step S42, the energy storage safety monitoring system judges whether the battery safety score is less than the first early warning threshold:

[0128] If not, return to step S42;

[0129] If yes, go to step S43;

[0130] Step S43, the energy storage safety monitoring system judges whether the battery safety score is greater than the second early warning threshold:

[0131] If yes, go to step S44;

[0132] If no, output a second warning prompt representing a secondary warning, and cut off the power supply of the corresponding energy storage object, and then go to step S48;

[0133] In step S44, the energy storage safety monitoring system outputs a first warning prompt representing a primary warning, and then goes to step S45;

[0134] In step S45, the energy storage safety monitoring system determines whether a first duration, during which the battery safety score is less than the first warning threshold and greater than the second warning threshold after the first warning prompt is output, reaches a first preset time period:

[0135] If no, return to step S44;

[0136] If yes, go to step S46;

[0137] In step S46, the energy storage safety monitoring system outputs a second warning prompt representing a secondary warning, and cuts off the power supply of the corresponding energy storage object;

[0138] In step S47, the energy storage safety monitoring system determines whether a second duration, during which the battery safety score is less than the first warning threshold and greater than the second warning threshold after the second warning prompt is output, reaches a second preset time period:

[0139] If no, return to step S46;

[0140] If yes, output a third warning prompt representing a tertiary warning, cut off the power supply of the corresponding energy storage object, and simultaneously control the start of the fire sprinkler device in the area where the energy storage object is located, and then exit;

[0141] In step S48, the energy storage safety monitoring system determines whether a third duration, during which the battery safety score is not greater than the second warning threshold after the second warning prompt is output, reaches a third preset time period:

[0142] If no, maintain the output of the second warning prompt representing the secondary warning, and cut off the power supply of the corresponding energy storage object;

[0143] If yes, output a third warning prompt representing a tertiary warning, and cut off the power supply of the corresponding energy storage object, and simultaneously control the start of the fire sprinkler device in the area where the energy storage object is located.

[0144] The above only describes the preferred embodiments of the present application, and does not limit the implementation and protection scope of the present application. For those skilled in the art, it should be realized that any equivalent replacement and obvious changes made according to the content of the present application should be included in the protection scope of the present application.

Claims

1. An energy storage safety monitoring system for an energy storage power station, characterized in that, The energy storage power station comprises multiple battery levels from top to bottom, and each battery level includes multiple energy storage objects; each battery level comprises, from top to bottom: battery stack level, battery cluster level, battery module level, and cell level; The cell level uses a single cell as the energy storage object; the battery module level uses multiple single cells as the energy storage object; the battery cluster level uses multiple battery modules as the energy storage object; and the battery stack level uses multiple battery clusters as the energy storage object. The energy storage safety monitoring system includes: The data acquisition module is used to continuously collect battery temperature data and battery voltage data of each energy storage object in each of the battery levels; The data processing module, connected to the data acquisition module, is used to process the battery temperature data and battery voltage data to obtain multiple energy storage safety indicators for each energy storage object. A safety score calculation module, connected to the data processing module, is used to calculate the battery safety score of each energy storage object according to each of the energy storage safety indicators. The monitoring and early warning module is connected to the safety score calculation module and is used to perform tiered energy storage safety early warning for each battery level based on the safety scores of each battery of each energy storage object contained therein. The security score calculation module includes: The standardization processing unit is used to perform unified dimension processing on each of the energy storage safety indicators corresponding to each of the battery levels to obtain standardized safety indicators. The weight configuration unit, connected to the standardization processing unit, is used to calculate the standard deviation of each standardized safety index corresponding to each of the energy storage objects included in each of the battery levels, and to use the proportion of the standard deviation of each standardized safety index in the sum of the standard deviations of all the standardized safety indices as the weight of the standardized safety index. The score calculation unit is connected to the standardization processing unit and the weight configuration unit respectively, and is used to obtain the battery safety score of the energy storage object for each energy storage object according to each standardized safety index and the corresponding weight. The fraction calculation unit includes: The standardized subunit is used to obtain a summation score for each of the energy storage objects by performing a weighted summation based on each of the standardized safety indicators and the corresponding weights, taking the negative value, and then performing standard normalization processing on the summation score to obtain the corresponding standard safety score. The mapping subunit, connected to the standardization subunit, is used to map the absolute value of the standard safety score to a preset score range to obtain the battery safety score.

2. The energy storage safety monitoring system according to claim 1, characterized in that, The tiered energy storage safety early warning system includes a first-level early warning, a second-level early warning, and a third-level early warning, which are distributed in a tiered manner. The monitoring and early warning module includes: An extraction unit is used to extract a first warning threshold and a second warning threshold from the battery safety scores corresponding to each of the included energy storage objects for each battery level. The first warning unit, connected to the extraction unit, is used to output a first warning prompt representing the first-level warning when the battery safety score is less than the first warning threshold and greater than the second warning threshold. The second warning unit, connected to the first warning unit, is used to maintain the output of the first warning prompt representing the first-level warning when the battery safety score is less than the first warning threshold and greater than the second warning threshold for a first duration that has not reached the first preset period after the first warning prompt is output; and to output the second warning prompt representing the second-level warning when the first duration has reached the first preset period, and to cut off the power supply of the corresponding energy storage object. The third early warning unit, connected to the second early warning unit, is used to, after outputting the second early warning prompt, when it is determined that the battery safety score is less than the first early warning threshold and the first duration of the battery safety score being greater than the second early warning threshold has not reached the second preset time period, maintain the output of the second early warning prompt representing the second level early warning and cut off the power supply of the corresponding energy storage object; and when it is determined that the second duration has reached the second preset time period, output the third early warning prompt representing the third level early warning and cut off the power supply of the corresponding energy storage object while controlling the start of the fire sprinkler system in the area where the energy storage object is located. The fourth warning unit, connected to the extraction unit, is used to output a second warning prompt representing the secondary warning when the battery safety score is not greater than the second warning threshold. The fifth early warning unit, connected to the fourth early warning unit, is used to maintain the output of the second early warning prompt representing the second level early warning when the third duration during which the battery safety score is not greater than the second early warning threshold has not reached the third preset time period after the second early warning prompt is output; and when the third duration reaches the third preset time period, output the third early warning prompt representing the third level early warning, and simultaneously cut off the power supply to the corresponding energy storage object and control the activation of the fire sprinkler system in the area where the energy storage object is located.

3. The energy storage safety monitoring system according to claim 2, characterized in that, In the extraction unit, the 90th percentile of the battery safety score corresponding to each energy storage object included in each battery level is extracted as the first warning threshold, and the upper quartile of each battery safety score is extracted as the second warning threshold.

4. The energy storage safety monitoring system according to claim 1, characterized in that, In the cell level, each of the energy storage safety indicators includes the cell temperature, cell temperature change rate, and cell voltage change rate of the individual cell. In the battery module level, each of the energy storage safety indicators includes the voltage range, voltage standard deviation, and temperature range of each individual cell, as well as the voltage change rate, temperature, and temperature change rate of the battery module. In the battery cluster hierarchy, each of the energy storage safety indicators includes the voltage range, voltage standard deviation, and temperature range of each battery module, as well as the voltage change rate, temperature, and temperature change rate of the battery cluster. In the battery stack hierarchy, each of the energy storage safety indicators includes the voltage range, voltage standard deviation, and temperature range of each battery cluster, as well as the voltage change rate, temperature, and temperature change rate of the battery stack.

5. A method for monitoring the safety of energy storage in an energy storage power station, characterized in that, The energy storage safety monitoring method, applied to the energy storage safety monitoring system as described in any one of claims 1-4, comprises: Step S1: The energy storage safety monitoring system continuously collects battery temperature data and battery voltage data of each energy storage object at each battery level; Step S2: The energy storage safety monitoring system processes the temperature data and voltage data of each battery to obtain multiple energy storage safety indicators for each energy storage object. Step S3: The energy storage safety monitoring system calculates the battery safety score of each energy storage object according to each of the energy storage safety indicators. Step S4: The energy storage safety monitoring system performs tiered energy storage safety early warning for each battery level based on the safety scores of each battery in each energy storage object.

6. The energy storage safety monitoring method according to claim 5, characterized in that, Step S3 includes: Step S31: The energy storage safety monitoring system performs unified dimension processing on each of the energy storage safety indicators corresponding to each of the battery levels to obtain standardized safety indicators. Step S32: For each battery level, the energy storage safety monitoring system calculates the standard deviation of each standardized safety indicator corresponding to each energy storage object, and uses the proportion of the standard deviation of each standardized safety indicator in the sum of the standard deviations of all standardized safety indicators as the weight of the standardized safety indicator. Step S33: The energy storage safety monitoring system processes each energy storage object according to the standardized safety indicators and their corresponding weights to obtain the battery safety score of the energy storage object.

7. The energy storage safety monitoring method according to claim 5, characterized in that, The tiered energy storage safety early warning system includes a first-level early warning, a second-level early warning, and a third-level early warning, which are distributed in a tiered manner. Then step S4 includes: Step S41: For each battery level, the energy storage safety monitoring system extracts a first warning threshold and a second warning threshold from the battery safety scores corresponding to each energy storage object. Step S42, the energy storage safety monitoring system determines whether the battery safety score is less than the first warning threshold: If not, return to step S42; If so, proceed to step S43; Step S43, the energy storage safety monitoring system determines whether the battery safety score is greater than the second warning threshold: If so, proceed to step S44; If not, output the second warning prompt representing the secondary warning, cut off the power supply of the corresponding energy storage object, and then proceed to step S48; In step S44, the energy storage safety monitoring system outputs a first warning prompt representing the first-level warning, and then proceeds to step S45; Step S45, the energy storage safety monitoring system determines whether the first duration during which the battery safety score is less than the first warning threshold and greater than the second warning threshold reaches a first preset time period after the first warning prompt is output: If not, return to step S44; If so, proceed to step S46; Step S46: The energy storage safety monitoring system outputs a second warning prompt representing the secondary warning and cuts off the power supply to the corresponding energy storage object; Step S47: The energy storage safety monitoring system determines whether, after outputting the second warning prompt, the second duration during which the battery safety score is less than the first warning threshold and greater than the second warning threshold reaches a second preset time period. If not, return to step S46; If so, output a third warning prompt representing the three-level warning, cut off the power supply to the corresponding energy storage object, and simultaneously control the start of the fire sprinkler system in the area where the energy storage object is located, and then exit; Step S48, the energy storage safety monitoring system determines whether the third duration during which the battery safety score is not greater than the second warning threshold reaches a third preset time period after the second warning prompt is output: If not, then maintain the output of the second warning prompt representing the secondary warning, and cut off the power supply to the corresponding energy storage object; If so, the third warning prompt representing the three-level warning will be output, and the power supply to the corresponding energy storage object will be cut off while the fire sprinkler system in the area where the energy storage object is located will be activated.

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