CN116794542A - Method and system for detecting and protecting short circuit of energy storage battery - Google Patents
Method and system for detecting and protecting short circuit of energy storage battery Download PDFInfo
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Abstract
The application relates to the technical field of energy storage batteries and discloses a method and a system for detecting and protecting the short circuit of an energy storage battery, wherein the method for detecting and protecting the short circuit of the energy storage battery comprises the steps of obtaining battery model information of a battery pack to be tested, obtaining corresponding product test data based on the battery model information, and generating a short circuit detection model based on the product test data; acquiring battery detection parameters of a battery pack to be detected, inputting the battery detection parameters into a short circuit detection model, analyzing the battery detection parameters, and enabling the battery detection parameters to correspond to items of battery parameter mapping one by one; if the battery detection parameters accord with the preset external short-circuit parameter rules, generating an external short-circuit alarm signal; calculating the actual measurement deviation rate between each battery detection parameter and the corresponding mapped battery parameter, and if any actual measurement deviation rate is larger than the corresponding preset actual measurement deviation threshold value, generating an internal short circuit alarm signal; the application has the effect of improving the detection of the short circuit phenomenon of the energy storage battery.
Description
Technical Field
The application relates to the technical field of energy storage batteries, in particular to a method and a system for detecting and protecting short circuits of an energy storage battery.
Background
At present, the use of the energy storage batteries is wider and wider, more and more energy storage batteries select a lithium battery pack for improving the energy storage density of the energy storage batteries, however, the lithium battery pack is extremely inflammable; when a short circuit fault occurs between output electrodes of the energy storage battery, the discharge current of the energy storage battery is extremely large, and a large amount of energy output by the energy storage battery acts on the internal resistance of the energy storage battery, so that the temperature of the energy storage battery rises sharply, and further, a diaphragm in the battery pack is deformed, the internal short circuit of the battery is caused, and finally, the battery is damaged.
At present, the method for detecting the short circuit of the energy storage battery mainly detects the output current of the energy storage battery, the battery temperature or the voltage difference between output electrodes, so as to judge whether the energy storage battery has the short circuit condition.
Accordingly, the inventors considered that the conventional battery short-circuit detection method has a problem that it is difficult to detect an internal short circuit of a battery with respect to the related art.
Disclosure of Invention
In order to improve the detection effect on the short circuit phenomenon of the energy storage battery, the application provides a method and a system for detecting and protecting the short circuit of the energy storage battery.
The first technical scheme adopted by the application is as follows:
A method of energy storage battery short circuit detection and protection, comprising:
acquiring battery model information of a battery pack to be tested, acquiring corresponding product test data based on the battery model information, and generating a short circuit detection model based on the product test data, wherein the short circuit detection model is provided with mapping battery parameters corresponding to charge/discharge flow data;
acquiring battery detection parameters of a battery pack to be detected, inputting the battery detection parameters into the short circuit detection model, and analyzing the battery detection parameters, wherein the battery detection parameters are in one-to-one correspondence with the items of the battery parameter mapping;
if the battery detection parameters accord with the preset external short-circuit parameter rules, an external short-circuit alarm signal is generated;
calculating the actual measurement deviation rate between each battery detection parameter and the corresponding mapping battery parameter, and generating an internal short circuit alarm signal if any one of the actual measurement deviation rates is larger than a corresponding preset actual measurement deviation threshold;
the battery detection parameters include temperature detection data, voltage detection data, resistance detection data, and current detection data.
By adopting the technical scheme, the battery model information marked on the battery pack product or the product package to be detected is obtained, the product test data corresponding to the battery pack to be detected is obtained from the manufacturer of the battery pack to be detected based on the battery model information, and a short circuit detection model is generated according to the product test data; acquiring battery detection parameters of a battery pack to be detected through various sensors, and inputting the acquired battery detection parameters into a short circuit detection model so as to analyze the battery detection parameters; comparing the external resistance data with a dangerous resistance threshold, comparing the discharge current data with a dangerous discharge current threshold, and if the external resistance data is smaller than the dangerous resistance threshold and the discharge current data is larger than the dangerous discharge current threshold, determining that the battery pack to be detected has an external short circuit fault so as to generate an external short circuit alarm signal; comparing and analyzing the deviation condition of the battery working parameters obtained by carrying out actual detection on the battery pack to be detected and the battery working parameters under ideal conditions, and judging that the battery has internal short circuit fault if the deviation exceeds the error allowable range; thereby improving the detection effect of the short circuit phenomenon of the energy storage battery.
The present application is in a preferred example: the method comprises the steps of obtaining battery model information of a battery pack to be tested, obtaining corresponding product test data based on the battery model information, and generating a short circuit detection model based on the product test data, wherein before the short circuit detection model is provided with mapping battery parameters corresponding to charge/discharge flow data, the method comprises the following steps:
based on battery model information of a battery pack to be tested, matching corresponding standard files, and determining a product test plan based on the standard files;
performing a battery pack test on the battery pack to be tested based on the product test plan, and acquiring the product test data, wherein the battery pack test comprises a charge-discharge cycle test, a safety performance test and a temperature characteristic test;
and determining the mapping battery parameters corresponding to different charge/discharge flow data based on the product test data to generate the short circuit detection model.
By adopting the technical scheme, the standard file corresponding to the type of the battery pack to be tested is determined according to the obtained battery model information of the battery pack to be tested, so that each product test item required to be performed on the type of the battery pack to be tested is determined, and a product test plan is formulated; testing the battery pack to be tested according to a formulated product test plan, and generating product test data according to data collected in the test process so as to simulate the battery parameter change condition of the battery pack to be tested when short circuits are caused under different conditions; and determining mapping battery parameters corresponding to different charge/discharge current values of the battery pack to be tested in different use scenes according to product test data when the battery pack to be tested is tested, so as to generate a short circuit detection model, and facilitating the subsequent detection of whether the battery pack to be tested has short circuit.
The present application is in a preferred example: the obtaining the battery detection parameters of the battery pack to be detected and inputting the battery detection parameters into the short circuit detection model, and analyzing the battery detection parameters comprises the following steps:
acquiring the battery detection parameters according to a preset sampling frequency, and inputting the battery detection parameters into the short circuit detection model;
and creating a temperature trend chart, a voltage trend chart, a resistance trend chart and a current trend chart of the battery pack to be tested based on the battery detection parameters and the corresponding detection time nodes.
By adopting the technical scheme, the battery detection parameters are acquired according to the preset sampling frequency, so that the equipment hardware requirements for data processing and data storage of the battery detection data are reduced, the data processing efficiency is improved, and the acquired battery detection parameters are input into a short circuit detection model; and creating a temperature trend chart, a voltage trend chart, a resistance trend chart and a current trend chart according to the acquired battery detection parameters and the corresponding detection time nodes, so that the change condition of the battery detection parameters of the battery pack to be detected along with time can be conveniently analyzed.
The present application is in a preferred example: after creating a temperature trend graph, a voltage trend graph, a resistance trend graph and a current trend graph of the battery pack to be tested based on the battery detection parameters and the corresponding detection time nodes, the method comprises the following steps:
Analyzing the voltage detection data change trend of the battery pack to be tested based on the voltage trend graph;
if the voltage detection data is detected to have a sudden drop-rise phenomenon, an internal short circuit alarm signal is generated;
and when the battery pack to be tested is in a standby state, if the reduction rate of the voltage detection data is greater than a preset voltage reduction threshold value, generating an internal short circuit alarm signal.
By adopting the technical scheme, according to the generated voltage trend graph, the change trend of the internal voltage data and the external voltage data of the battery pack to be tested along with time is analyzed; because the voltage of the battery pack to be tested changes correspondingly along with the change of the residual electric quantity when the battery pack to be tested is in a charging and discharging state, when the internal short circuit phenomenon occurs in the battery cells of the battery pack to be tested, abnormal voltage drop-rise phenomenon can occur, and once the abnormal voltage drop-rise phenomenon is detected, the internal short circuit fault of the battery pack to be tested is judged to occur so as to generate an internal short circuit alarm signal; when the battery resistance is in a short circuit phenomenon, a self-discharge process exceeding a normal range occurs, if the reduction rate of the voltage detection data is greater than a preset voltage reduction threshold value, the abnormal self-discharge phenomenon of the battery pack to be detected is considered, and then the internal short circuit fault of the battery pack to be detected is determined, so that an internal short circuit alarm signal is generated.
The present application is in a preferred example: the deviation threshold is related to the cycle number of the battery pack to be tested, the calculating of the deviation rate between each battery detection parameter and the corresponding mapped battery parameter includes:
based on the product test data, determining the corresponding mapping battery parameters of the battery pack to be tested in different cycle times;
in the safety performance test, the deviation threshold value of the battery pack to be tested in each cycle is set based on the corresponding product test data when the battery pack to be tested fails.
By adopting the technical scheme, as the electric capacity and the internal structure of the battery can change slowly in the process of repeated charge and discharge cycles, the property of the battery changes slowly, so that the corresponding mapping battery parameters of the battery pack to be tested under different cycle times are determined based on the product test data, the rationality of actual measurement deviation threshold setting is improved, and the accuracy of judging the short circuit phenomenon of the battery is further improved.
The present application is in a preferred example: the resistance detection data comprise external resistance data, and the current detection data comprise discharge current data;
And if the battery detection parameters accord with the preset external short-circuit parameter rules, generating an external short-circuit alarm signal, wherein the external short-circuit alarm signal comprises the following steps:
when the battery pack to be tested is in a discharge state, acquiring the external resistance data and the discharge current data;
and if the external resistance data is smaller than a preset dangerous resistance threshold, the discharge current data is larger than a preset dangerous discharge current threshold, and an external short circuit alarm signal is generated.
By adopting the technical scheme, when the battery pack to be tested is in a discharge state, the battery pack to be tested has the risk of external short circuit, and external resistance data and discharge current data are obtained; because the external short circuit fault of the battery pack to be detected is usually caused by direct connection of the positive electrode and the negative electrode through a conductive object, when the external short circuit fault occurs, the external resistance data can be detected to be smaller than the dangerous resistance threshold value, and the discharge current data is larger than the dangerous discharge current threshold value, so that the external short circuit fault of the battery pack to be detected is determined to occur, and an external short circuit alarm signal is generated.
The present application is in a preferred example: the battery pack to be tested comprises a plurality of single battery cells, and the battery detection parameters comprise data for independently detecting each single battery cell;
After the temperature trend graph, the voltage trend graph, the resistance trend graph and the current trend graph of the battery pack to be tested are created based on the battery detection parameters and the corresponding detection time nodes, the method further comprises the following steps:
calculating the average value of all battery detection parameters corresponding to all the single battery cells;
setting each single cell as a target single cell one by one, and calculating the single deviation rate of each battery detection parameter of each target single cell and a corresponding average value;
and when detecting that the monomer deviation rate of any one of the target single battery cells is larger than a preset single deviation threshold value, generating fault tracing information.
By adopting the technical scheme, because the types and specifications of the single battery cells adopted by the battery pack to be tested are the same, the battery detection parameters among the single battery cells should have consistency; based on battery detection parameters obtained by detecting each single battery cell, calculating an average value of data measured by each single battery cell of each battery detection parameter; calculating the deviation rate of each battery detection parameter of the target single battery cell and the corresponding average value as the single deviation rate; if the battery detection parameters of one single battery cell deviate from the battery detection parameters of other single battery cells seriously, and the overall consistency of the battery is destroyed, the single battery cell is judged to have internal short circuit, and fault tracing information is generated based on the identification information of the single battery cell so as to repair and eliminate the fault of the battery pack to be tested later.
The second object of the application is realized by the following technical scheme:
a system for energy storage battery short circuit detection and protection, comprising:
the short circuit detection model generation module is used for acquiring battery model information of the battery pack to be detected, acquiring corresponding product test data based on the battery model information, and generating a short circuit detection model based on the product test data, wherein the short circuit detection model is provided with mapped battery parameters corresponding to charge/discharge flow data;
the battery detection parameter analysis module is used for acquiring battery detection parameters of the battery pack to be detected, inputting the battery detection parameters into the short circuit detection model, and analyzing the battery detection parameters, wherein the battery detection parameters are in one-to-one correspondence with the items of the battery parameter mapping;
the external short circuit alarm module is used for generating an external short circuit alarm signal if the battery detection parameters accord with a preset external short circuit parameter rule;
and the internal short circuit alarm module is used for calculating the actual measurement deviation rate between each battery detection parameter and the corresponding mapping battery parameter, and generating an internal short circuit alarm signal if any one of the actual measurement deviation rates is larger than the corresponding preset actual measurement deviation threshold value.
By adopting the technical proposal, the utility model has the advantages that,
The third object of the application is realized by the following technical scheme:
a computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the method of energy storage battery short circuit detection and protection as claimed in any one of the preceding claims when the computer program is executed.
The fourth object of the application is realized by the following technical scheme:
a computer readable storage medium storing a computer program which when executed by a processor performs the steps of a method of energy storage cell short circuit detection and protection as described in any one of the preceding claims.
In summary, the present application includes at least one of the following beneficial technical effects:
1. obtaining battery model information marked on a battery pack product or product package to be tested, obtaining product test data corresponding to the battery pack to be tested from a manufacturer of the battery pack to be tested based on the battery model information, and generating a short circuit detection model according to the product test data; acquiring battery detection parameters of a battery pack to be detected through various sensors, and inputting the acquired battery detection parameters into a short circuit detection model so as to analyze the battery detection parameters; comparing the external resistance data with a dangerous resistance threshold, comparing the discharge current data with a dangerous discharge current threshold, and if the external resistance data is smaller than the dangerous resistance threshold and the discharge current data is larger than the dangerous discharge current threshold, determining that the battery pack to be detected has an external short circuit fault so as to generate an external short circuit alarm signal; comparing and analyzing the deviation condition of the battery working parameters obtained by carrying out actual detection on the battery pack to be detected and the battery working parameters under ideal conditions, and judging that the battery has internal short circuit fault if the deviation exceeds the error allowable range; thereby improving the detection effect of the short circuit phenomenon of the energy storage battery.
2. According to the generated voltage trend graph, analyzing the change trend of the internal voltage data and the external voltage data of the battery pack to be tested along with time; because the voltage of the battery pack to be tested changes correspondingly along with the change of the residual electric quantity when the battery pack to be tested is in a charging and discharging state, when the internal short circuit phenomenon occurs in the battery cells of the battery pack to be tested, abnormal voltage drop-rise phenomenon can occur, and once the abnormal voltage drop-rise phenomenon is detected, the internal short circuit fault of the battery pack to be tested is judged to occur so as to generate an internal short circuit alarm signal; when the battery resistance is in a short circuit phenomenon, a self-discharge process exceeding a normal range occurs, if the reduction rate of the voltage detection data is greater than a preset voltage reduction threshold value, the abnormal self-discharge phenomenon of the battery pack to be detected is considered, and then the internal short circuit fault of the battery pack to be detected is determined, so that an internal short circuit alarm signal is generated.
3. Because the types and specifications of the single battery cells adopted by the battery pack to be tested are the same, the battery detection parameters among the single battery cells should have consistency; based on battery detection parameters obtained by detecting each single battery cell, calculating an average value of data measured by each single battery cell of each battery detection parameter; calculating the deviation rate of each battery detection parameter of the target single battery cell and the corresponding average value as the single deviation rate; if the battery detection parameters of one single battery cell deviate from the battery detection parameters of other single battery cells seriously, and the overall consistency of the battery is destroyed, the single battery cell is judged to have internal short circuit, and fault tracing information is generated based on the identification information of the single battery cell so as to repair and eliminate the fault of the battery pack to be tested later.
Drawings
Fig. 1 is a flowchart of a method for detecting and protecting a short circuit of an energy storage battery according to a first embodiment of the present application.
Fig. 2 is a flowchart of step S10 in the method of detecting and protecting a short circuit of an energy storage battery according to the present application.
Fig. 3 is a flowchart of step S20 in the method of detecting and protecting a short circuit of an energy storage battery according to the present application.
Fig. 4 is a flowchart of step S22 in the method of detecting and protecting a short circuit of an energy storage battery according to the present application.
Fig. 5 is another flowchart of step S22 in the method of detecting and protecting a short circuit of an energy storage battery according to the present application.
Fig. 6 is a flowchart of step S30 in the method of detecting and protecting a short circuit of an energy storage battery according to the present application.
Fig. 7 is a flowchart of step S40 in the method of detecting and protecting a short circuit of an energy storage battery according to the present application.
Fig. 8 is a schematic block diagram of a system for detecting and protecting a short circuit of an energy storage battery according to a second embodiment of the present application.
Fig. 9 is a schematic view of an apparatus in a third embodiment of the present application.
Detailed Description
The application is described in further detail below with reference to fig. 1 to 9.
Example 1
Referring to fig. 1, the application discloses a method for detecting and protecting short circuit of an energy storage battery, which specifically comprises the following steps:
s10: and acquiring battery model information of the battery pack to be tested, acquiring corresponding product test data based on the battery model information, and generating a short circuit detection model based on the product test data, wherein the short circuit detection model is provided with mapping battery parameters corresponding to the charge/discharge flow data.
In this embodiment, the battery pack to be tested refers to a battery pack used for storing electric energy in an energy storage battery device, and the battery pack is formed by connecting a plurality of single cells with the same model and specification in series and/or in parallel, and the energy storage battery device is provided with sensors for detecting parameters such as temperature, voltage, resistance, current, capacitance and the like of the battery pack to be tested and the single cells; the product test data is provided by manufacturers of the electric measurement battery packs, and the battery packs to be tested are tested in different working environments and under different working parameters; the short circuit detection model is generated according to the product test data and is used for detecting whether the battery pack to be tested has a short circuit condition according to the measured data of the battery pack to be tested, and a data processing algorithm, a data comparison algorithm and a data matching algorithm are arranged in the short circuit detection model.
In this embodiment, mapping battery parameters refers to inputting current charging or discharging current data of a battery pack to be tested into a short circuit detection model for simulation prediction according to current working environment and working state information of the battery pack to be tested to obtain other parameters of the battery pack to be tested; the mapped battery parameters include temperature sensing data, voltage sensing data, resistance sensing data, and current sensing data.
Specifically, battery model information marked on a product or a product package of the battery pack to be tested is obtained, and product test data corresponding to the battery pack to be tested is obtained from a manufacturer of the battery pack to be tested based on the battery model information; and generating a short circuit detection model according to the product test data, so that whether the battery pack to be tested has a short circuit phenomenon or not can be conveniently judged according to the actual measurement data of the battery pack to be tested.
As shown in fig. 2, before step S10, the method includes:
s11: and based on the battery model information of the battery pack to be tested, matching the corresponding standard file, and determining a product test plan based on the standard file.
Specifically, according to the obtained battery model information of the battery pack to be tested, a standard file corresponding to the battery pack to be tested is determined, and the standard file can be a national standard, an industry standard or an enterprise standard, so that each product test item required to be performed on the battery pack to be tested in the model is determined to make a product test plan.
S12: and executing a battery pack test on the battery pack to be tested based on the product test plan, and acquiring the product test data, wherein the battery pack test comprises a charge-discharge cycle test, a safety performance test and a temperature characteristic test.
Specifically, testing the battery pack to be tested according to a formulated product test plan, and generating product test data according to data collected in the test process; the testing of the battery pack to be tested comprises a charge-discharge cycle test, a safety performance test and a temperature characteristic test, so that the characteristics of the battery pack to be tested under different charge-discharge cycle times and temperature environments can be obtained; the safety performance test comprises a short circuit test, and the specific test method for executing the specific short circuit test comprises the following steps: the battery pack comprises a national standard needling test, a blunt needle test, a round rod impact test, an extrusion test after impurities are placed in a battery cell, a built-in low-melting-point metal post-heating and a built-in memory alloy heating, so that the battery parameter change condition of the battery pack to be tested when the battery pack is short-circuited under different conditions is simulated.
S13: and determining the mapping battery parameters corresponding to different charge/discharge flow data based on the product test data to generate the short circuit detection model.
Specifically, according to product test data when the battery pack to be tested is tested, mapping battery parameters corresponding to different charge/discharge current values of the battery pack to be tested in different use scenes are determined, so that a short circuit detection model is generated, and whether the battery pack to be tested has a short circuit or not is conveniently detected subsequently.
S20: and acquiring battery detection parameters of the battery pack to be detected, inputting the battery detection parameters into the short circuit detection model, and analyzing the battery detection parameters, wherein the battery detection parameters are in one-to-one correspondence with the items of the battery parameter mapping.
In this embodiment, the battery detection parameters include temperature detection data, voltage detection data, resistance detection data and current detection data, where the temperature detection data includes ambient temperature data outside the energy storage battery device and temperature data of each single cell, the voltage detection data includes internal voltage data and external voltage data of the battery pack to be detected, the resistance detection data includes internal resistance data and external resistance data of the battery pack to be detected, and the current detection data includes charging current data of the battery pack to be detected in a charging state and discharging current data of the battery pack to be detected in a discharging state; and the battery detection parameters are in one-to-one correspondence with the items mapped to the battery parameters.
Specifically, battery detection parameters of the battery pack to be detected are obtained through various sensors, and the obtained battery detection parameters are input into a short circuit detection model so as to analyze the battery detection parameters, so that whether the battery pack to be detected has a short circuit phenomenon or not is further judged.
As shown in fig. 3, in step S20, the method includes:
s21: and acquiring the battery detection parameters according to a preset sampling frequency, and inputting the battery detection parameters into the short circuit detection model.
In this embodiment, the sampling frequency is a frequency for collecting the battery detection parameter, and preferably, the sampling frequency may be set to be 1 second, 5 seconds or 10 seconds, or may be set according to actual requirements.
Specifically, battery detection parameters are obtained according to a preset sampling frequency, so that the equipment hardware requirements for data processing and data storage of battery detection data are reduced, and meanwhile, the data processing efficiency is improved; and inputting the acquired battery detection parameters into a short circuit detection model so as to judge whether the battery pack to be detected has a short circuit phenomenon or not.
S22: and creating a temperature trend chart, a voltage trend chart, a resistance trend chart and a current trend chart of the battery pack to be tested based on the battery detection parameters and the corresponding detection time nodes.
Specifically, when the battery detection parameters are collected according to a preset sampling frequency, corresponding time nodes are collected together;
generating a temperature trend chart of the battery pack to be tested according to the acquired temperature detection data and the corresponding detection time nodes;
Generating a voltage trend graph of the battery pack to be tested according to the collected voltage detection data and the corresponding detection time node;
generating a resistance trend graph of the battery pack to be tested according to the acquired resistance detection data and the corresponding detection time node;
generating a current trend chart of the battery pack to be tested according to the collected current detection data and the corresponding detection time node;
and the change condition of the battery detection parameters of the battery pack to be detected along with time is convenient to analyze subsequently.
As shown in fig. 4, after step S22, the method includes:
s221: and analyzing the voltage detection data change trend of the battery pack to be detected based on the voltage trend graph.
Specifically, according to the generated voltage trend graph, the change trend of the internal voltage data and the external voltage data of the battery pack to be tested along with time is analyzed.
S222: if the voltage detection data is detected to have the sudden drop-rise phenomenon, an internal short circuit alarm signal is generated.
In this embodiment, the voltage dip phenomenon refers to that the voltage of the battery pack to be measured decreases with time at a faster rate, and the recovery phenomenon refers to that the voltage of the battery pack to be measured increases with time at a faster rate, where the relevant threshold value for the voltage change rate when determining the voltage dip and voltage recovery phenomena can be determined according to actual requirements; the internal short circuit alarm signal is used for prompting a user that the internal short circuit phenomenon occurs in the energy storage battery equipment and triggering an alarm.
Specifically, when the battery pack to be tested is in a charging and discharging state, the voltage of the battery pack to be tested is correspondingly changed along with the change of the residual electric quantity, when an internal short circuit phenomenon occurs in a battery cell of the battery pack to be tested, abnormal voltage drop-rise phenomenon can occur, voltage detection data in the charging and discharging process of the battery pack to be tested are detected, and once the abnormal voltage drop-rise phenomenon is detected, the internal short circuit fault of the battery pack to be tested is judged to occur, so that an internal short circuit alarm signal is generated.
S223: and when the battery pack to be tested is in a standby state, if the reduction rate of the voltage detection data is greater than a preset voltage reduction threshold value, generating an internal short circuit alarm signal.
In this embodiment, the standby state refers to the battery pack to be tested being neither in a charged state nor in a discharged state; the specific value of the pressure drop threshold can be determined according to experiments and actual requirements.
Specifically, when a short circuit phenomenon occurs due to the battery resistance, a self-discharge process exceeding a normal range occurs, thereby causing an increase in the voltage reduction rate; and if the reduction rate of the voltage detection data is larger than a preset voltage reduction threshold value, the abnormal self-discharge phenomenon of the battery pack to be detected is considered to exist, and then the internal short circuit fault of the battery pack to be detected is determined to occur so as to generate an internal short circuit alarm signal.
Further, an internal short circuit alarm signal is sent to an alarm device arranged on the energy storage battery equipment so as to prompt a user that the energy storage battery equipment has an internal short circuit phenomenon; wherein the alarm device can be a buzzer and/or a warning lamp.
As shown in fig. 5, after step S22, the method includes:
s224: and calculating the average value of all battery detection parameters corresponding to all the single battery cells.
Because the types and specifications of the single battery cells adopted by the battery pack to be tested are the same, when the battery pack to be tested works normally, the battery detection parameters among the single battery cells should have consistency, and if the battery detection parameters of one single battery cell deviate from the battery detection parameters of other single battery cells seriously, the consistency of the whole battery is destroyed, the single battery cell is judged to have internal short circuit.
In this embodiment, the battery pack to be tested includes a plurality of unit cells, and at least one battery detection parameter includes data for independently detecting each unit cell.
Specifically, based on the battery detection parameters obtained by detecting each single battery cell, the average value of the data measured by each single battery cell of each battery detection parameter is calculated.
S225: and setting each single cell as a target single cell one by one, and calculating the single deviation rate of each battery detection parameter of each target single cell and the corresponding average value.
In this embodiment, the target unit cell refers to a study object determined from each unit cell.
Specifically, each single cell is determined as a target single cell one by one, and the deviation rate of each battery detection parameter of the target single cell and the corresponding average value is calculated as the single deviation rate so as to acquire the deviation condition between the working parameters of each single cell and other single cells.
S226: and when detecting that the monomer deviation rate of any one of the target single battery cells is larger than a preset actually measured deviation threshold value, generating fault tracing information.
In this embodiment, the single deviation threshold is a threshold for determining whether the battery detection parameter of the single battery cell deviates greatly from the corresponding average value, and the specific value of the single deviation threshold may be set according to the actual requirement.
Specifically, when any single deviation rate of the target single cell is detected to be larger than a preset actually measured deviation threshold, a certain battery detection parameter of the target single cell is considered to deviate from a corresponding average value to a large extent, the single cell is determined to have a short circuit phenomenon, and fault tracing information is generated based on the identification information of the single cell so as to repair and eliminate faults of the battery pack to be detected later.
S30: and if the battery detection parameters accord with the preset external short-circuit parameter rules, generating an external short-circuit alarm signal.
In this embodiment, the external short-circuit parameter rule refers to a rule set according to the characteristics of the battery when the external short-circuit phenomenon occurs, and is used for comparing with the battery detection parameter to determine whether the external short-circuit phenomenon exists in the battery pack to be detected; the external short circuit alarm signal is used for prompting a user that the external short circuit phenomenon occurs in the energy storage battery device and triggering an alarm.
Specifically, the obtained battery detection is compared with a preset external short circuit parameter rule, and if the battery detection parameter accords with the characteristic of external short circuit, the battery pack to be detected is considered to have the external short circuit phenomenon so as to generate an external short circuit alarm signal.
Further, an external short circuit alarm signal is sent to an alarm device arranged on the energy storage battery equipment so as to prompt a user that the energy storage battery equipment has an internal short circuit phenomenon; wherein the alarm device can be a buzzer and/or a warning lamp.
As shown in fig. 6, in step S30, the method includes:
s31: and when the battery pack to be tested is in a discharge state, acquiring the external resistance data and the discharge current data.
Specifically, when the battery pack to be tested is in a discharging state, the battery pack to be tested has the risk of external short circuit, external resistance data and discharging current data are obtained, and whether the battery pack to be tested has the phenomenon of external short circuit or not is further judged conveniently.
S32: and if the external resistance data is smaller than a preset dangerous resistance threshold, the discharge current data is larger than a preset dangerous discharge current threshold, and an external short circuit alarm signal is generated.
In this embodiment, the external short-circuit parameter rule includes a preset dangerous resistance threshold and a dangerous discharge current threshold, where specific values of the dangerous resistance threshold and the dangerous discharge current threshold may be determined and adjusted according to experiments and actual requirements.
Specifically, since the external short circuit fault of the battery pack to be tested is usually caused by direct connection between the positive electrode and the negative electrode through a conductive object, when the external short circuit fault occurs, the external resistance value of the battery pack to be tested is small, and the current is large; and comparing the external resistance data with a dangerous resistance threshold, comparing the discharge current data with the dangerous discharge current threshold, and if the external resistance data is smaller than the dangerous resistance threshold and the discharge current data is larger than the dangerous discharge current threshold, determining that the battery pack to be detected has an external short circuit fault so as to generate an external short circuit alarm signal.
S40: and calculating the actual measurement deviation rate between each battery detection parameter and the corresponding mapping battery parameter, and if any actual measurement deviation rate is larger than the corresponding preset actual measurement deviation threshold value, generating an internal short circuit alarm signal.
In this embodiment, the measured deviation rate refers to the deviation rate between the battery detection parameter actually measured by the battery pack to be measured and the mapped battery parameter under ideal conditions; the measured deviation threshold is used for comparing with the measured deviation rate to judge whether the battery pack to be tested is short-circuited or not.
Specifically, based on the battery detection parameters obtained by actual detection and the mapped battery parameters of the battery pack to be detected in the normal working state recorded in the short circuit detection model, calculating the deviation rate between each battery detection parameter and the corresponding mapped battery parameter and defining the deviation rate as the actually measured deviation rate; and when any measured deviation rate is larger than a corresponding preset measured deviation threshold, considering that the battery pack to be tested has an internal short circuit fault so as to generate an internal short circuit alarm signal.
Specifically, according to the deviation condition of the battery working parameter obtained by actually detecting the battery pack to be detected and the battery working parameter under ideal condition, if the deviation exceeds the allowable error range, judging that the battery has internal short circuit fault.
As shown in fig. 7, before step S40, the method includes:
s41: and determining the corresponding mapping battery parameters of the battery pack to be tested in different circulation times based on the product test data.
In this embodiment, the mapped battery parameters include predicted data of the battery pack to be tested at different cycle times.
Specifically, because the electric capacity and the internal structure of the battery can change slowly in the process of repeated charge and discharge cycles, the property of the battery changes slowly, and therefore, based on product test data, the corresponding mapping battery parameters of the battery pack to be tested under different cycle times are determined, so that the accuracy of judging the short circuit phenomenon of the battery is improved.
S42: in the safety performance test, the actual measurement deviation threshold value of the battery pack to be tested in each cycle is set based on the corresponding product test data when the battery pack to be tested fails.
In this embodiment, the measured deviation threshold is related to the number of cycles of the battery pack to be tested.
Specifically, in the safety performance test link, according to the product test data corresponding to the failure of the battery pack to be tested and the cycle number information corresponding to the failure of the battery pack to be tested, the actual measurement deviation threshold value of the battery pack to be tested in each cycle number is set, and the rationality of setting the actual measurement deviation threshold value is improved.
It should be understood that the sequence number of each step in the above embodiment does not mean the sequence of execution, and the execution sequence of each process should be determined by its function and internal logic, and should not be construed as limiting the implementation process of the embodiment of the present application.
In one embodiment, a system for detecting and protecting a short circuit of an energy storage battery is provided, which corresponds to the method for detecting and protecting a short circuit of an energy storage battery in the above embodiment.
As shown in fig. 8, the system for detecting and protecting the short circuit of the energy storage battery comprises a short circuit detection model generating module, a battery detection parameter analyzing module, an external short circuit alarming module and an internal short circuit alarming module. The detailed description of each functional module is as follows:
the short circuit detection model generation module is used for acquiring battery model information of the battery pack to be detected, acquiring corresponding product test data based on the battery model information, and generating a short circuit detection model based on the product test data, wherein the short circuit detection model is provided with mapped battery parameters corresponding to charge/discharge flow data;
the battery detection parameter analysis module is used for acquiring battery detection parameters of the battery pack to be detected, inputting the battery detection parameters into the short circuit detection model, and analyzing the battery detection parameters, wherein the battery detection parameters are in one-to-one correspondence with the items of the battery parameter mapping;
the external short circuit alarm module is used for generating an external short circuit alarm signal if the battery detection parameters accord with a preset external short circuit parameter rule;
And the internal short circuit alarm module is used for calculating the actual measurement deviation rate between each battery detection parameter and the corresponding mapping battery parameter, and generating an internal short circuit alarm signal if any one of the actual measurement deviation rates is larger than the corresponding preset actual measurement deviation threshold value.
Wherein, short circuit detection model generation module still includes:
the product test plan determining submodule is used for matching corresponding standard files based on battery model information of the battery pack to be tested and determining a product test plan based on the standard files;
the product test data acquisition sub-module is used for executing a battery pack test on a battery pack to be tested based on the product test plan to acquire the product test data, wherein the battery pack test comprises a charge-discharge cycle test, a safety performance test and a temperature characteristic test;
and the mapped battery parameter determining sub-module is used for determining the mapped battery parameters corresponding to different charge/discharge flow data based on the product test data so as to generate the short circuit detection model.
Wherein, battery detection parameter analysis module still includes:
the battery detection parameter input sub-module is used for acquiring the battery detection parameters according to a preset sampling frequency and inputting the battery detection parameters into the short circuit detection model;
And the battery detection parameter map creation sub-module is used for creating a temperature trend map, a voltage trend map, a resistance trend map and a current trend map of the battery pack to be detected based on the battery detection parameters and the corresponding detection time nodes.
Wherein, battery detection parameter map creation submodule further includes:
the voltage change trend analysis sub-module is used for analyzing the voltage detection data change trend of the battery pack to be tested based on the voltage trend graph;
the voltage sudden drop-rise alarm sub-module is used for generating an internal short circuit alarm signal if the sudden drop-rise phenomenon of the voltage detection data is detected;
the voltage data acceleration alarm sub-module is used for generating an internal short circuit alarm signal if the reduction rate of the voltage detection data is greater than a preset voltage reduction threshold value when the battery pack to be tested is in a standby state;
the detection parameter average value calculation sub-module is used for calculating the average value of all the battery detection parameters corresponding to all the single battery cells;
the single deviation rate calculation sub-module is used for setting each single cell as a target single cell one by one, and calculating the single deviation rate of each battery detection parameter of each target single cell and a corresponding average value;
And the fault tracing sub-module is used for generating fault tracing information when detecting that any monomer deviation rate of the target single battery cell is larger than a preset actual measurement deviation threshold value.
Wherein, outer short circuit alarm module still includes:
the discharge state detection sub-module is used for acquiring the external resistance data and the discharge current data when the battery pack to be detected is in a discharge state;
and the external short circuit alarm signal generation sub-module is used for generating an external short circuit alarm signal if the external resistance data is smaller than a preset dangerous resistance threshold value and the discharge current data is larger than the preset dangerous discharge current threshold value.
Wherein, internal short circuit alarm module still includes:
the cycle number analysis sub-module is used for determining the mapping battery parameters corresponding to the battery pack to be tested in different cycle numbers based on the product test data;
the deviation threshold setting submodule is used for setting the deviation threshold of the battery pack to be tested in each cycle time based on the product test data corresponding to the failure of the battery pack to be tested in the safety performance test.
For specific limitations regarding the system for detecting and protecting the short circuit of the energy storage battery, reference may be made to the above limitation regarding the method for detecting and protecting the short circuit of the energy storage battery, and the detailed description thereof will be omitted herein; all or part of each module in the system for detecting and protecting the short circuit of the energy storage battery can be realized by software, hardware and the combination thereof; the above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a server, and the internal structure of which may be as shown in fig. 9. The computer device includes a processor, a memory, a network interface, and a database connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer equipment is used for storing battery model information, product test data, a short circuit detection model, mapped battery parameters, battery detection parameters, external short circuit parameter rules, measured deviation rate, measured deviation threshold value and other data. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a method of energy storage battery short circuit detection and protection.
In one embodiment, a computer device is provided comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor implementing the following steps when executing the computer program:
S10: acquiring battery model information of a battery pack to be tested, acquiring corresponding product test data based on the battery model information, and generating a short circuit detection model based on the product test data, wherein the short circuit detection model is provided with mapping battery parameters corresponding to charge/discharge flow data;
s20: acquiring battery detection parameters of a battery pack to be detected, inputting the battery detection parameters into the short circuit detection model, and analyzing the battery detection parameters, wherein the battery detection parameters are in one-to-one correspondence with the items of the battery parameter mapping;
s30: if the battery detection parameters accord with the preset external short-circuit parameter rules, an external short-circuit alarm signal is generated;
s40: and calculating the actual measurement deviation rate between each battery detection parameter and the corresponding mapping battery parameter, and if any actual measurement deviation rate is larger than the corresponding preset actual measurement deviation threshold value, generating an internal short circuit alarm signal.
In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:
s10: acquiring battery model information of a battery pack to be tested, acquiring corresponding product test data based on the battery model information, and generating a short circuit detection model based on the product test data, wherein the short circuit detection model is provided with mapping battery parameters corresponding to charge/discharge flow data;
S20: acquiring battery detection parameters of a battery pack to be detected, inputting the battery detection parameters into the short circuit detection model, and analyzing the battery detection parameters, wherein the battery detection parameters are in one-to-one correspondence with the items of the battery parameter mapping;
s30: if the battery detection parameters accord with the preset external short-circuit parameter rules, an external short-circuit alarm signal is generated;
s40: and calculating the actual measurement deviation rate between each battery detection parameter and the corresponding mapping battery parameter, and if any actual measurement deviation rate is larger than the corresponding preset actual measurement deviation threshold value, generating an internal short circuit alarm signal.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink), DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that; the technical scheme described in the foregoing embodiments can be modified or some of the features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (10)
1. A method for detecting and protecting a short circuit of an energy storage battery, comprising:
acquiring battery model information of a battery pack to be tested, acquiring corresponding product test data based on the battery model information, and generating a short circuit detection model based on the product test data, wherein the short circuit detection model is provided with mapping battery parameters corresponding to charge/discharge flow data;
Acquiring battery detection parameters of a battery pack to be detected, inputting the battery detection parameters into the short circuit detection model, and analyzing the battery detection parameters, wherein the battery detection parameters are in one-to-one correspondence with the items of the battery parameter mapping;
if the battery detection parameters accord with the preset external short-circuit parameter rules, an external short-circuit alarm signal is generated;
and calculating the actual measurement deviation rate between each battery detection parameter and the corresponding mapping battery parameter, and if any actual measurement deviation rate is larger than the corresponding preset actual measurement deviation threshold value, generating an internal short circuit alarm signal.
2. The method for detecting and protecting the short circuit of the energy storage battery according to claim 1, wherein the method comprises the following steps: the method comprises the steps of obtaining battery model information of a battery pack to be tested, obtaining corresponding product test data based on the battery model information, and generating a short circuit detection model based on the product test data, wherein before the short circuit detection model is provided with mapping battery parameters corresponding to charge/discharge flow data, the method comprises the following steps:
based on battery model information of a battery pack to be tested, matching corresponding standard files, and determining a product test plan based on the standard files;
performing a battery pack test on the battery pack to be tested based on the product test plan, and acquiring the product test data, wherein the battery pack test comprises a charge-discharge cycle test, a safety performance test and a temperature characteristic test;
And determining the mapping battery parameters corresponding to different charge/discharge flow data based on the product test data to generate the short circuit detection model.
3. The method for detecting and protecting the short circuit of the energy storage battery according to claim 1, wherein the method comprises the following steps: the obtaining the battery detection parameters of the battery pack to be detected and inputting the battery detection parameters into the short circuit detection model, and analyzing the battery detection parameters comprises the following steps:
acquiring the battery detection parameters according to a preset sampling frequency, and inputting the battery detection parameters into the short circuit detection model;
and creating a temperature trend chart, a voltage trend chart, a resistance trend chart and a current trend chart of the battery pack to be tested based on the battery detection parameters and the corresponding detection time nodes.
4. A method of energy storage cell short circuit detection and protection according to claim 3, wherein: after creating a temperature trend graph, a voltage trend graph, a resistance trend graph and a current trend graph of the battery pack to be tested based on the battery detection parameters and the corresponding detection time nodes, the method comprises the following steps:
analyzing the voltage detection data change trend of the battery pack to be tested based on the voltage trend graph;
if the voltage detection data is detected to have a sudden drop-rise phenomenon, an internal short circuit alarm signal is generated;
And when the battery pack to be tested is in a standby state, if the reduction rate of the voltage detection data is greater than a preset voltage reduction threshold value, generating an internal short circuit alarm signal.
5. The method for detecting and protecting the short circuit of the energy storage battery according to claim 1, wherein the method comprises the following steps: the deviation threshold is related to the cycle number of the battery pack to be tested, the calculating of the deviation rate between each battery detection parameter and the corresponding mapped battery parameter includes:
based on the product test data, determining the corresponding mapping battery parameters of the battery pack to be tested in different cycle times;
in the safety performance test, the deviation threshold value of the battery pack to be tested in each cycle is set based on the corresponding product test data when the battery pack to be tested fails.
6. The method for detecting and protecting the short circuit of the energy storage battery according to claim 1, wherein the method comprises the following steps: the resistance detection data comprise external resistance data, and the current detection data comprise discharge current data;
and if the battery detection parameters accord with the preset external short-circuit parameter rules, generating an external short-circuit alarm signal, wherein the external short-circuit alarm signal comprises the following steps:
When the battery pack to be tested is in a discharge state, acquiring the external resistance data and the discharge current data;
and if the external resistance data is smaller than a preset dangerous resistance threshold, the discharge current data is larger than a preset dangerous discharge current threshold, and an external short circuit alarm signal is generated.
7. A method of energy storage cell short circuit detection and protection according to claim 3, wherein: the battery pack to be tested comprises a plurality of single battery cells, and the battery detection parameters comprise data for independently detecting each single battery cell;
after the temperature trend graph, the voltage trend graph, the resistance trend graph and the current trend graph of the battery pack to be tested are created based on the battery detection parameters and the corresponding detection time nodes, the method further comprises the following steps:
calculating the average value of all battery detection parameters corresponding to all the single battery cells;
setting each single cell as a target single cell one by one, and calculating the single deviation rate of each battery detection parameter of each target single cell and a corresponding average value;
and when detecting that the monomer deviation rate of any one of the target single battery cells is larger than a preset actually measured deviation threshold value, generating fault tracing information.
8. A system for energy storage battery short circuit detection and protection, comprising:
the short circuit detection model generation module is used for acquiring battery model information of the battery pack to be detected, acquiring corresponding product test data based on the battery model information, and generating a short circuit detection model based on the product test data, wherein the short circuit detection model is provided with mapped battery parameters corresponding to charge/discharge flow data;
the battery detection parameter analysis module is used for acquiring battery detection parameters of the battery pack to be detected, inputting the battery detection parameters into the short circuit detection model, and analyzing the battery detection parameters, wherein the battery detection parameters are in one-to-one correspondence with the items of the battery parameter mapping;
the external short circuit alarm module is used for generating an external short circuit alarm signal if the battery detection parameters accord with a preset external short circuit parameter rule;
and the internal short circuit alarm module is used for calculating the actual measurement deviation rate between each battery detection parameter and the corresponding mapping battery parameter, and generating an internal short circuit alarm signal if any one of the actual measurement deviation rates is larger than the corresponding preset actual measurement deviation threshold value.
9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the computer program, carries out the steps of the method for energy storage battery short circuit detection and protection according to any one of claims 1 to 7.
10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method of energy storage battery short circuit detection and protection as claimed in any one of claims 1 to 7.
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