CN117293420A - Thermal runaway detection method, system and battery compartment - Google Patents
Thermal runaway detection method, system and battery compartment Download PDFInfo
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- CN117293420A CN117293420A CN202311319540.1A CN202311319540A CN117293420A CN 117293420 A CN117293420 A CN 117293420A CN 202311319540 A CN202311319540 A CN 202311319540A CN 117293420 A CN117293420 A CN 117293420A
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- 238000001514 detection method Methods 0.000 title claims abstract description 97
- 238000012544 monitoring process Methods 0.000 claims abstract description 142
- 238000004891 communication Methods 0.000 claims abstract description 20
- 239000000779 smoke Substances 0.000 claims description 66
- 230000000630 rising effect Effects 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 16
- 230000002265 prevention Effects 0.000 claims description 8
- 238000004590 computer program Methods 0.000 claims description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 18
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 18
- 238000004146 energy storage Methods 0.000 abstract description 12
- 230000002349 favourable effect Effects 0.000 abstract description 8
- 238000012423 maintenance Methods 0.000 abstract description 8
- 238000004880 explosion Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 description 5
- 206010068065 Burning mouth syndrome Diseases 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000012983 electrochemical energy storage Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4228—Leak testing of cells or batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Emergency Alarm Devices (AREA)
Abstract
The invention discloses a thermal runaway detection method, a thermal runaway detection system and a battery compartment, which relate to the field of battery safety monitoring, wherein based on the fact that the time of releasing gas when a lithium ion battery is in thermal runaway is earlier than the time of changing voltage and temperature of the lithium ion battery, a gas monitoring module in communication connection with a control module is arranged at a first preset position of each battery cabinet in the battery compartment in advance, the output voltage of each battery cabinet is obtained, the gas monitoring value sent by each gas monitoring module is obtained, and then whether the corresponding battery cabinet is in thermal runaway is judged based on the output voltage, the gas monitoring value and a preset detection and early warning strategy. Compared with the prior art, the scheme can find out whether the lithium ion battery is out of control or not earlier, is favorable for realizing early fault alarm, is favorable for operation and maintenance personnel to find out more timely and solve the problem of thermal runaway, reduces the probability of fire and explosion accidents, avoids casualties and property loss, and improves the safety of the whole battery compartment and the energy storage power station.
Description
Technical Field
The invention relates to the technical field of battery safety monitoring, in particular to a thermal runaway detection method, a thermal runaway detection system and a battery compartment.
Background
Electrochemical energy storage power stations use lithium ion batteries as main energy storage sources, and are increasingly widely applied worldwide at present; the electrolyte of various lithium ion batteries including lithium iron phosphate batteries generally uses flammable and explosive organic solvents, which determines the characteristics of extrinsic safety, and in actual use, fire and explosion accidents are easily caused, thus threatening the safety of the whole energy storage power station.
In the prior art, in order to solve the fire problem caused by thermal runaway of a lithium ion battery, the following method is generally adopted, namely: depending on the EMS (Energy Management System), the energy management system) or the BMS (Battery Management System, the battery management system), the voltage or the temperature is obtained, and then whether the thermal runaway of the lithium ion battery occurs is judged. However, in practice, the mode has larger hysteresis, and the thermal runaway detection and early warning of the lithium ion battery cannot be well realized, so that the safety of the whole energy storage power station still cannot be effectively ensured.
Therefore, how to provide a solution to the above technical problem is a problem that a person skilled in the art needs to solve at present.
Disclosure of Invention
The invention aims to provide a thermal runaway detection method, a system and a battery compartment, which can find out whether a lithium ion battery is out of control or not earlier, are favorable for realizing early fault alarm, are favorable for more timely finding out and solving the problem of thermal runaway of operation and maintenance personnel, reduce the probability of fire and explosion accidents, avoid casualties and property loss, and improve the safety of the whole battery compartment and an energy storage power station.
In order to solve the technical problems, the invention provides a thermal runaway detection method, which is applied to a control module in a battery compartment, wherein the battery compartment further comprises a plurality of battery cabinets, and a gas monitoring module in communication connection with the control module is arranged at a first preset position of each battery cabinet, and the thermal runaway detection method comprises the following steps:
obtaining the output voltage of each battery cabinet;
acquiring a gas monitoring value sent by each gas monitoring module, wherein the gas monitoring value represents the gas condition at a first preset position corresponding to the battery cabinet;
and judging whether the corresponding battery cabinet is out of control or not based on the output voltage, the gas monitoring value and a preset detection and early warning strategy.
Preferably, the gas monitoring module comprises a gas concentration detection module, and the gas monitoring value comprises a gas concentration value;
based on the output voltage, the gas monitoring value and a preset detection and early warning strategy, determining that the corresponding battery cabinet is out of control, including:
for the output voltage and the gas concentration value corresponding to any one of the battery cabinets, the following steps are executed:
determining a gas alarm threshold corresponding to the output voltage;
judging whether the gas concentration value is larger than the gas alarm threshold value or not;
if the gas concentration value is larger than the gas alarm threshold, judging whether the gas concentration value is larger than a concentration rising standard, wherein the concentration rising standard is the sum of a preset gas concentration increasing step length and a gas concentration value sent by the gas concentration detection module last time;
and if the concentration is larger than the concentration rising standard, judging that the corresponding battery cabinet is out of control.
Preferably, after determining that the gas concentration value is greater than the concentration-increase criterion, the method further comprises:
adding 1 to the accumulated alarm identification value corresponding to the battery cabinet;
judging whether the accumulated alarm identification value is larger than a preset alarm frequency;
if yes, the method proceeds to a step of judging that the corresponding battery cabinet is out of control.
Preferably, determining a gas alarm threshold corresponding to the output voltage includes:
determining a standard gas concentration value corresponding to the output voltage based on a preset voltage-concentration correspondence;
and determining the product of the standard gas concentration value and a preset multiple as a gas alarm threshold.
Preferably, after determining that the corresponding battery cell has not undergone thermal runaway, the method further includes:
judging whether the standard gas concentration value is equal to the gas concentration value or not;
if not, determining the average value of the gas concentration value and the standard gas concentration value;
and updating the preset voltage-concentration corresponding relation based on the average value.
Preferably, the gas monitoring module further comprises a smoke detection module; the thermal runaway detection method further comprises:
and judging whether the corresponding battery cabinet is out of control or not based on the smoke concentration value representing the smoke concentration condition at the corresponding battery cabinet sent by the smoke detection module and a preset smoke detection early warning strategy.
Preferably, a gas reference monitoring module is further arranged at a second preset position of the battery compartment, and the control module is further in communication connection with the gas reference monitoring module;
the thermal runaway detection method further comprises:
acquiring a gas monitoring reference value sent by the gas reference monitoring module, wherein the gas monitoring reference value represents the gas condition at the second preset position;
and judging whether the currently determined thermal runaway judgment result is valid or not based on the gas monitoring reference values, the gas monitoring values and a preset false alarm prevention strategy.
Preferably, the determining that the currently determined thermal runaway determination result is valid based on the gas monitoring reference value, each gas monitoring value, and a preset false alarm preventing policy includes:
judging whether the gas monitoring reference value is larger than each gas monitoring value or not;
if not, the currently determined thermal runaway determination result is determined to be valid.
In order to solve the technical problem, the invention also provides a thermal runaway detection system, which is applied to a control module in a battery compartment, wherein the battery compartment further comprises a plurality of battery cabinets, a gas monitoring module in communication connection with the control module is arranged at a first preset position of each battery cabinet, and the thermal runaway detection system comprises:
the first acquisition unit is used for acquiring the output voltage of each battery cabinet;
the second acquisition unit is used for acquiring the gas monitoring value sent by each gas monitoring module, and the gas monitoring value represents the gas condition at the first preset position of the corresponding battery cabinet;
and the judging unit is used for judging whether the corresponding battery cabinet is out of control or not based on the output voltage, the gas monitoring value and a preset detection and early warning strategy.
In order to solve the technical problems, the invention also provides a battery compartment, which comprises a control module and a plurality of battery cabinets, wherein a gas monitoring module in communication connection with the control module is arranged at a first preset position of each battery cabinet;
the control module is used for implementing the steps of the thermal runaway detection method as described above when executing the computer program.
The application provides a thermal runaway detection method, system and battery compartment, based on the time that the time of releasing gas is earlier than the time that its voltage and temperature change when lithium ion battery took place thermal runaway, set up the gas monitoring module that is connected with control module communication in advance in the first position department of predetermineeing of each battery cabinet in the battery compartment, acquire the output voltage of each battery cabinet, acquire the gas monitoring value that the characterization that each gas monitoring module sent corresponds the first position department gas condition of battery cabinet, and then based on output voltage, gas monitoring value and predetermine detection early warning strategy, judge whether thermal runaway takes place for corresponding battery cabinet. Compared with the prior art, the scheme can find out whether the lithium ion battery is out of control or not earlier, is favorable for realizing early fault alarm, is favorable for operation and maintenance personnel to find out more timely and solve the problem of thermal runaway, reduces the probability of fire and explosion accidents, avoids casualties and property loss, and improves the safety of the whole battery compartment and the energy storage power station.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the prior art and the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a thermal runaway detection method provided by the present invention;
fig. 2 is a schematic structural view of a battery compartment provided by the present invention;
fig. 3 is a schematic structural diagram of a thermal runaway detection system according to the present invention.
Detailed Description
The core of the invention is to provide a thermal runaway detection method, a system and a battery compartment, which can find out whether the lithium ion battery is out of control or not earlier, are beneficial to realizing early fault alarm, are beneficial to more timely finding out and solving the problem of thermal runaway of operation and maintenance personnel, reduce the probability of fire and explosion accidents, avoid casualties and property loss, and improve the safety of the whole battery compartment and an energy storage power station.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 and 2, fig. 1 is a flowchart of a thermal runaway detection method provided by the present invention, and fig. 2 is a schematic structural diagram of a battery compartment provided by the present invention.
In this embodiment, considering that in the prior art, in order to detect the thermal runaway condition of the lithium ion battery, the voltage and the temperature are generally obtained by means of the EMS or the BMS as the basis for determination. However, in practice, it is found that the above method has a large hysteresis and the detection effect is not good. In order to solve the technical problems, the application provides a thermal runaway detection method, which has better detection effect, so that the safety of the whole battery compartment and the energy storage power station is powerfully ensured.
The thermal runaway detection method is applied to a control module in a battery compartment, the battery compartment also comprises a plurality of battery cabinets, and a gas monitoring module in communication connection with the control module is arranged at a first preset position of each battery cabinet, and comprises the following steps:
s11: obtaining the output voltage of each battery cabinet;
in particular, the method may be applied to any battery compartment in an energy storage power station, the control module including, but not limited to, various controllers such as an MCU (Microcontroller Unit, micro control unit); a plurality of battery cells are arranged in each battery cabinet, and the specific number of the battery cabinets is not particularly limited; the first preset position includes, but is not limited to, an air outlet corresponding to the battery cabinet.
More specifically, the battery compartment may further include a plurality of BMSs, each BMS being responsible for the collection of battery performance data for a number of battery cabinets, including, but not limited to, output voltages; the control module can also be in communication connection with each of the BMSs (the connection mode includes but is not limited to being realized through can bus or ethernet), so as to obtain the output voltage of each battery cabinet through the BMSs; the communication connection between the control module and each gas monitoring module includes, but is not limited to, communication by means of a network cable connection.
It should be noted that, the design of the present application is initially: in practice, it has been found that lithium ion batteries release C when overcharged 3 H 8 (propane) and the like, and release CH in early stage of occurrence of thermal runaway 4 (methane), CO (carbon monoxide), C 3 H 8 The voltage and the temperature can be changed after a certain time, so that the gas condition is monitored by the gas monitoring module, and the thermal runaway detection is realized, and compared with the detection effect of the mode in the prior artGood.
It should be further noted that, referring to fig. 2, a certain battery compartment is taken as an example in fig. 2, and the arrangement mode of each gas monitoring module is shown when 7 battery cabinets are included therein, wherein the arrangement mode is limited by the picture display emphasis, the connection circuit between each gas monitoring module and the control module is temporarily omitted, the gas monitoring module is identified by reference sign B in fig. 2, and the control module is identified by reference sign a.
S12: acquiring a gas monitoring value sent by each gas monitoring module, wherein the gas monitoring value represents the gas condition at a first preset position corresponding to the battery cabinet;
s13: based on the output voltage, the gas monitoring value and a preset detection and early warning strategy, whether the corresponding battery cabinet is out of control or not is judged.
Specifically, a preset detection and early warning strategy is designed in advance, and then based on the step S13, aiming at the output voltage and the gas monitoring value of any battery cabinet, whether the battery cabinet is out of control or not is judged by means of the preset detection and early warning strategy. It should be further noted that the control module may also be connected to a master control management module, where the master control management module includes, but is not limited to, a server, and further sends and feeds back a determination result of whether thermal runaway occurs to each battery cabinet to the server; in addition, when judging that a certain battery cabinet is out of control, the control module can output a corresponding alarm signal to the server, and/or the control module can alarm in a voice broadcasting or text display mode to prompt relevant operation and maintenance personnel to perform relevant treatment before the combustion of the lithium ion battery; it can be understood that the time of warning by the thermal runaway detection method in the present application is earlier than that in the prior art.
In summary, the application provides a thermal runaway detection method, based on the fact that when thermal runaway occurs in a lithium ion battery, the time of releasing gas is earlier than the time of changing voltage and temperature of the lithium ion battery, a gas monitoring module in communication connection with a control module is arranged at a first preset position of each battery cabinet in a battery compartment in advance, the output voltage of each battery cabinet is obtained, the gas monitoring value which is sent by each gas monitoring module and is used for representing the condition of gas at the first preset position of the corresponding battery cabinet is obtained, and then whether the corresponding battery cabinet is in thermal runaway is judged based on the output voltage, the gas monitoring value and a preset detection early warning strategy. Compared with the prior art, the scheme can find out whether the lithium ion battery is out of control or not earlier, is favorable for realizing early fault alarm, is favorable for operation and maintenance personnel to find out more timely and solve the problem of thermal runaway, reduces the probability of fire and explosion accidents, avoids casualties and property loss, and improves the safety of the whole battery compartment and the energy storage power station.
Based on the above embodiments:
as a preferred embodiment, the gas monitoring module comprises a gas concentration detection module, and the gas monitoring value comprises a gas concentration value;
based on output voltage, gas monitoring value and preset detection early warning strategy, it is judged that thermal runaway occurs in the corresponding battery cabinet, including:
for the output voltage and the gas concentration value corresponding to any one of the battery cabinets, the following steps are executed:
determining a gas alarm threshold corresponding to the output voltage;
judging whether the gas concentration value is larger than a gas alarm threshold value or not;
if the gas concentration value is larger than the gas alarm threshold value, judging whether the gas concentration value is larger than a concentration rising standard, wherein the concentration rising standard is the sum of a preset gas concentration increasing step length and a gas concentration value sent by a gas concentration detection module last time;
and if the temperature of the battery cabinet is larger than the concentration rising standard, judging that the corresponding battery cabinet is out of control.
In the embodiment, the execution logic for judging the thermal runaway of the corresponding battery cabinet is provided, the implementation mode is simple and reliable, and the practical application is facilitated. Specifically, the gas monitoring module comprises a gas concentration detection module, and the gas monitoring value acquired by the corresponding gas concentration detection module is the gas concentration value; in an actual setting, the gas monitoring module may further include an MCU, and the gas concentration detection module may include a gas sensor; more specifically, the MCU controls the gas sensor to collect gas concentration data in real time or at a certain preset collection frequency (such as 0.1 second/time), and the average value calculated after the collection is completed for 10 times is used as a gas concentration value to be transmitted to the control module; for the control module, the execution logic of the step S11 may specifically be to obtain the output voltage of each battery cabinet through the BMS at a frequency of 1 second/each time.
The above steps can be relied on for any output voltage and gas concentration value, and detailed description is omitted. The specific value of the preset gas concentration increasing step is not particularly limited, and may be set according to actual requirements.
As a preferred embodiment, after determining that the gas concentration value is greater than the concentration-increase criterion, further comprising:
adding 1 to the accumulated alarm identification value corresponding to the battery cabinet;
judging whether the accumulated alarm identification value is larger than the preset alarm times or not;
if yes, the method proceeds to a step of judging that the corresponding battery cabinet is out of control.
In this embodiment, in order to make the result of determining whether thermal runaway occurs as reliable as possible, a preset number of alarms may be preset, and a specific numerical value of the number is set according to actual requirements; after judging that the gas concentration value is greater than the concentration rising standard each time, adding 1 to the accumulated alarm identification value corresponding to the battery cabinet, and further judging whether the accumulated alarm identification value is greater than the preset alarm times or not; if not, keeping monitoring; if yes, the fact that the gas concentration value of the battery cabinet exceeds the gas alarm threshold value for N times continuously (namely, the preset alarm times) is indicated, and the gas concentration value is larger than the concentration rising standard is judged, and then the battery cabinet is judged to be out of control, and further an alarm is given to prompt the battery cabinet to be out of control. It can be understood that after the operation and maintenance personnel confirms the alarm information, a recovery instruction can be issued remotely so as to reset the accumulated alarm identification value corresponding to the battery cabinet to 0, thereby facilitating the subsequent monitoring.
It should be noted that, in the above embodiment, if it is determined that the gas concentration value is not greater than the gas alarm threshold, it is indicated that thermal runaway does not occur currently, so the cumulative alarm flag value corresponding to the battery cabinet may be set to 0 here; if the gas concentration value is not greater than the concentration rising standard, the gas concentration is greater than the alarm threshold value, but the self-adjusting trend is generated later, so that the observation can be kept, the accumulated alarm identification value can be continuously monitored without accumulation and the original value of the accumulated alarm identification value.
As a preferred embodiment, determining a gas alarm threshold corresponding to the output voltage comprises:
determining a standard gas concentration value corresponding to the output voltage based on a preset voltage-concentration correspondence;
and determining the product of the standard gas concentration value and the preset multiple as a gas alarm threshold value.
In this embodiment, an execution logic for determining a gas alarm threshold is provided, specifically, a preset voltage-concentration correspondence is established for each battery cabinet in advance, and for any battery cabinet, the correspondence essentially records a normal gas concentration mean value corresponding to each voltage value, and an output voltage is used as a search standard to search in the correspondence, so as to determine a standard gas concentration value corresponding to the output voltage; it is to be understood that if the search result is empty, a default gas concentration value may be used as the standard gas concentration value, which is not particularly limited herein, and may be determined according to actual requirements.
The product of the standard gas concentration value and the preset multiple is determined to be a gas alarm threshold, wherein the preset multiple comprises, but is not limited to, 2 times, and the gas alarm threshold is set according to actual requirements. Therefore, the determination of the gas alarm threshold value can be simply and reliably realized through the mode, and the determination of the threshold value is connected with the actual operation working condition, so that the engineering practice is more attached, and the accuracy of the judgment result is improved.
As a preferred embodiment, after determining that the corresponding battery cell has not undergone thermal runaway, it further includes:
judging whether the standard gas concentration value is equal to the gas concentration value;
if not, determining the average value of the gas concentration value and the standard gas concentration value;
the preset voltage-concentration correspondence is updated based on the average value.
In this embodiment, after it is determined that thermal runaway does not occur in the corresponding battery cabinet, it is described that the corresponding gas concentration value at the current output voltage of the battery cabinet is normal data, so that it is determined whether the standard gas concentration value is equal to the gas concentration value, if so, the corresponding relationship corresponding to the battery cabinet does not need to be updated; if not, determining an average value of the gas concentration value and the standard gas concentration value, namely, calculating a value obtained by (the gas concentration value+the standard gas concentration value)/2 as the average value, and updating a preset voltage-concentration corresponding relation based on the average value, namely, updating the existing standard gas concentration value corresponding to the output voltage in the corresponding relation to the average value. Therefore, through the mode, various working conditions of the electric cabinet can be combined in a self-adaptive mode, updating of the corresponding relation is guaranteed, and accuracy of a thermal runaway judgment result is improved.
As a preferred embodiment, the gas monitoring module further comprises a smoke detection module; the thermal runaway detection method further comprises:
based on the smoke concentration value representing the smoke concentration condition at the corresponding battery cabinet sent by the smoke detection module and a preset smoke detection early warning strategy, whether the corresponding battery cabinet is out of control or not is judged.
In this embodiment, in order to further improve the accuracy of thermal runaway determination and reduce the risk of false alarm, the gas monitoring module may further include a smoke detection module in addition to the gas concentration detection module, and the gas monitoring value further includes a smoke concentration value correspondingly; in an actual setting, the smoke detection module may specifically include a smoke sensor, and the MCU in the gas monitoring module controls the smoke sensor to collect smoke concentration data in real time or at a certain preset collection frequency (for example, 0.1 seconds/time), and after the collection is completed for 10 times, the average value is calculated and is transmitted to the control module as a smoke concentration value.
More specifically, based on the smoke concentration value representing the smoke concentration condition at the corresponding battery cabinet sent by the smoke detection module and the preset smoke detection early warning strategy, the execution logic for determining that the corresponding battery cabinet is out of control can be:
judging whether the smoke concentration value is larger than a smoke alarm threshold or not according to the smoke concentration value corresponding to any battery cabinet;
if the smoke concentration value is larger than the smoke alarm threshold, judging whether the smoke concentration value is larger than a smoke concentration rising standard, wherein the smoke concentration rising standard is the sum of a preset smoke concentration increasing step length (which is set according to actual requirements) and a smoke concentration value sent by the smoke detection module last time;
if the smoke concentration rising standard is larger than the smoke concentration rising standard, adding 1 to a smoke accumulated alarm identification value corresponding to the battery cabinet, judging whether the smoke accumulated alarm identification value is larger than a preset smoke alarm frequency (which is set according to actual requirements), and if the smoke accumulated alarm identification value is larger than the preset smoke alarm frequency, judging that the corresponding battery cabinet is out of control, and giving an alarm; of course, after the operation and maintenance personnel confirms the alarm, a command can be remotely issued to control the smoke accumulated alarm identification value to be set to 0 so as to be convenient for follow-up monitoring.
It is understood that the thermal runaway alarm of the corresponding battery cell is performed when the corresponding battery cell is determined to be thermally out of control by means of the gas concentration value and/or when the corresponding battery cell is determined to be thermally out of control by means of the smoke concentration value.
As a preferred embodiment, a gas reference monitoring module is further arranged at the second preset position of the battery compartment, and the control module is further in communication connection with the gas reference monitoring module;
the thermal runaway detection method further comprises:
acquiring a gas monitoring reference value sent by a gas reference monitoring module, wherein the gas monitoring reference value represents the gas condition at a second preset position;
and judging whether the currently determined thermal runaway judgment result is valid or not based on the gas monitoring reference values, the gas monitoring values and a preset false alarm prevention strategy.
In this embodiment, further considering that in practical application, external gas or smoke may enter from the ventilation opening of the battery compartment, and affect the working accuracy of the gas monitoring module, so in order to reduce the probability of false alarm, a gas reference monitoring module may be further disposed at the second preset position of the battery compartment, where the specific setting of the gas reference monitoring module may refer to the setting of the gas monitoring module in the foregoing embodiment, for example, the gas reference monitoring module includes a gas concentration detection module, an MCU and a smoke detection module, and the corresponding gas reference monitoring reference values include a gas reference concentration value and a smoke reference concentration value.
In addition, the specific implementation manner of the communication connection between the control module and the gas reference monitoring module includes, but is not limited to, the communication connection by means of a network cable; the second preset position may be a vent of the battery compartment (the vent is usually far away from the position where the battery cabinet is located), please refer to fig. 2, fig. 2 is a schematic illustration, taking 2 vents as an example, illustrating a schematic illustration of the arrangement of the gas reference monitoring module, and being limited by a picture showing focus, omitting the connection between the gas reference monitoring module and the control module, and in fig. 2, the gas reference monitoring module is identified by reference symbol C; and finally, judging whether the currently determined thermal runaway judgment result is valid or not based on the gas monitoring reference value, each gas monitoring value and a preset false alarm prevention strategy.
It should be further noted that the gas reference monitoring module may collect the gas monitoring reference value in real time or at a certain preset collection frequency (e.g. 0.1 seconds/time); the present invention is not particularly limited herein.
As a preferred embodiment, determining that the currently determined thermal runaway determination result is valid based on the gas monitoring reference value, each gas monitoring value, and a preset false alarm preventing policy includes:
judging whether the gas monitoring reference value is larger than each gas monitoring value or not;
if not, the currently determined thermal runaway determination result is determined to be valid.
In the present embodiment, execution logic for determining whether the currently determined thermal runaway determination result is valid is given, specifically, it should be first described that, here, determination of whether the determination result is valid does not affect the determination process of whether thermal runaway occurs for a certain battery cabinet itself; when the number of the gas monitoring reference values is multiple, taking the maximum value of the multiple gas monitoring reference values as the gas monitoring reference value for comparison; when the gas monitoring reference value for comparison is larger than each gas monitoring value, the fact that external thermal runaway gas or smoke possibly enters the battery compartment at the moment is indicated, and the lithium battery in the battery cabinet in the battery compartment is not subjected to thermal runaway, so that the currently determined thermal runaway judgment result is invalid; and when the gas monitoring reference value for comparison is not greater than each gas monitoring value, judging that the currently determined thermal runaway judgment result is valid.
It will be appreciated that when the gas monitoring reference value includes a gas reference concentration value and a smoke reference concentration value, and the gas monitoring value includes a gas concentration value and a smoke concentration value, the above-described determination process essentially refers to determining whether the gas reference concentration value is greater than each gas concentration value, and determining whether the smoke reference concentration value is greater than each smoke concentration value.
It should be further noted that, in order to further simplify the control logic, before determining whether the gas concentration value is greater than the gas alarm threshold, determining whether the gas concentration value is less than a gas reference concentration value may be further included, if yes, directly determining that no thermal runaway occurs in the battery cabinet currently; if not, a step of judging whether the gas concentration value is larger than the gas alarm threshold value is carried out; likewise, before judging whether the smoke concentration value is greater than the smoke alarm threshold, judging whether the smoke concentration value is smaller than a smoke reference concentration value, if so, directly judging that no thermal runaway occurs in the current battery cabinet; if not, a step of judging whether the smoke concentration value is larger than the smoke alarm threshold value is carried out.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a thermal runaway detection system according to the present invention.
This thermal runaway detecting system is applied to the control module in the battery compartment, still includes a plurality of battery cabinets in the battery compartment, and the first position department of predetermining of each battery cabinet all is equipped with the gas monitoring module who is connected with the control module communication, and this thermal runaway detecting system includes:
a first acquisition unit 21 for acquiring an output voltage of each battery cabinet;
the second obtaining unit 22 is configured to obtain a gas monitoring value sent by each gas monitoring module, where the gas monitoring value represents a gas condition at a first preset position corresponding to the battery cabinet;
and a determining unit 23, configured to determine whether the corresponding battery cabinet is out of control based on the output voltage, the gas monitoring value, and a preset detection and early warning strategy.
For the description of the thermal runaway detection system provided in the present invention, reference is made to the embodiment of the thermal runaway detection method described above, and the description thereof will not be repeated here.
As a preferred embodiment, the gas monitoring module comprises a gas concentration detection module, and the gas monitoring value comprises a gas concentration value;
the determination unit 23 includes:
a threshold determining unit, configured to determine, for an output voltage and a gas concentration value corresponding to any one of the battery cabinets, a gas alarm threshold corresponding to the output voltage;
the first judging unit is used for judging whether the gas concentration value is larger than the gas alarm threshold value or not; if the gas alarm threshold value is larger than the gas alarm threshold value, entering a second judging unit;
the second judging unit is configured to judge whether the gas concentration value is greater than a concentration rising standard, where the concentration rising standard is a sum of a preset gas concentration increasing step length and a gas concentration value sent last time by the gas concentration detecting module; if the concentration is greater than the concentration rising standard, entering a first determining unit;
the first determining unit is used for determining that the corresponding battery cabinet is out of control.
As a preferred embodiment, the thermal runaway detection system further includes:
the accumulation unit is used for adding 1 to the accumulated alarm identification value corresponding to the battery cabinet after judging that the gas concentration value is greater than the concentration rising standard;
the third judging unit is used for judging whether the accumulated alarm identification value is larger than the preset alarm times or not; if yes, entering a first determining unit;
as a preferred embodiment, the threshold determining unit includes:
a standard gas concentration value determining unit, configured to determine a standard gas concentration value corresponding to the output voltage based on a preset voltage-concentration correspondence;
and the second determining unit is used for determining that the product of the standard gas concentration value and the preset multiple is a gas alarm threshold value.
As a preferred embodiment, the thermal runaway detection system further includes:
a fourth judgment unit configured to judge whether the standard gas concentration value and the gas concentration value are equal after judging that the corresponding battery cell is not thermally out of control; if not, triggering a third determining unit;
the third determining unit is used for determining an average value of the gas concentration value and the standard gas concentration value;
and an updating unit for updating the preset voltage-concentration correspondence relationship based on the average value.
As a preferred embodiment, the gas monitoring module further comprises a smoke detection module; the thermal runaway detection system further comprises:
and the smoke judging unit is used for judging whether the corresponding battery cabinet is out of control or not based on the smoke concentration value representing the smoke concentration condition at the corresponding battery cabinet sent by the smoke detecting module and a preset smoke detection early warning strategy.
As a preferred embodiment, a gas reference monitoring module is further arranged at a second preset position of the battery compartment, and the control module is further in communication connection with the gas reference monitoring module;
the thermal runaway detection system further comprises:
the third acquisition unit is used for acquiring a gas monitoring reference value sent by the gas reference monitoring module, wherein the gas monitoring reference value represents the gas condition at the second preset position;
and the false alarm prevention judging unit is used for judging whether the currently determined thermal runaway judging result is valid or not based on the gas monitoring reference value, each gas monitoring value and a preset false alarm prevention strategy.
As a preferred embodiment, the false alarm prevention determination unit includes:
a fifth judging unit configured to judge whether the gas monitoring reference value is greater than each of the gas monitoring values; if not, triggering a fourth determining unit;
the fourth determination unit is configured to determine that the currently determined thermal runaway determination result is valid.
The invention also provides a battery compartment, which comprises a control module and a plurality of battery cabinets, wherein a gas monitoring module in communication connection with the control module is arranged at a first preset position of each battery cabinet;
the control module is used for implementing the steps of the thermal runaway detection method as described above when executing the computer program.
For the description of the battery compartment provided in the present invention, reference is made to the embodiment of the thermal runaway detection method described above, and the description thereof is omitted herein.
The invention also provides an energy storage power station, which comprises the battery compartment.
For the description of the energy storage power station provided in the present invention, reference is made to the embodiment of the thermal runaway detection method described above, and the description thereof is omitted here.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. Relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a thermal runaway detection method which is characterized in that is applied to the control module in the battery compartment, still include a plurality of battery cabinets in the battery compartment, each battery cabinet's first default position department all is equipped with the gas monitoring module of control module communication connection, thermal runaway detection method includes:
obtaining the output voltage of each battery cabinet;
acquiring a gas monitoring value sent by each gas monitoring module, wherein the gas monitoring value represents the gas condition at a first preset position corresponding to the battery cabinet;
and judging whether the corresponding battery cabinet is out of control or not based on the output voltage, the gas monitoring value and a preset detection and early warning strategy.
2. A thermal runaway detection method according to claim 1, wherein said gas monitoring module comprises a gas concentration detection module, said gas monitoring value comprising a gas concentration value;
based on the output voltage, the gas monitoring value and a preset detection and early warning strategy, determining that the corresponding battery cabinet is out of control, including:
for the output voltage and the gas concentration value corresponding to any one of the battery cabinets, the following steps are executed:
determining a gas alarm threshold corresponding to the output voltage;
judging whether the gas concentration value is larger than the gas alarm threshold value or not;
if the gas concentration value is larger than the gas alarm threshold, judging whether the gas concentration value is larger than a concentration rising standard, wherein the concentration rising standard is the sum of a preset gas concentration increasing step length and a gas concentration value sent by the gas concentration detection module last time;
and if the concentration is larger than the concentration rising standard, judging that the corresponding battery cabinet is out of control.
3. The thermal runaway detection method according to claim 2, characterized by further comprising, after determining that the gas concentration value is greater than the concentration-increase criterion:
adding 1 to the accumulated alarm identification value corresponding to the battery cabinet;
judging whether the accumulated alarm identification value is larger than a preset alarm frequency;
if yes, the method proceeds to a step of judging that the corresponding battery cabinet is out of control.
4. A thermal runaway detection method according to claim 2, wherein determining a gas alarm threshold corresponding to the output voltage comprises:
determining a standard gas concentration value corresponding to the output voltage based on a preset voltage-concentration correspondence;
and determining the product of the standard gas concentration value and a preset multiple as a gas alarm threshold.
5. The thermal runaway detection method according to claim 4, further comprising, after determining that the corresponding battery cell has not undergone thermal runaway:
judging whether the standard gas concentration value is equal to the gas concentration value or not;
if not, determining the average value of the gas concentration value and the standard gas concentration value;
and updating the preset voltage-concentration corresponding relation based on the average value.
6. A thermal runaway detection method according to claim 2, wherein said gas monitoring module further comprises a smoke detection module; the thermal runaway detection method further comprises:
and judging whether the corresponding battery cabinet is out of control or not based on the smoke concentration value representing the smoke concentration condition at the corresponding battery cabinet sent by the smoke detection module and a preset smoke detection early warning strategy.
7. The thermal runaway detection method according to any one of claims 1 to 6, wherein a gas reference monitoring module is further provided at a second preset position of said battery compartment, said control module being further communicatively connected to said gas reference monitoring module;
the thermal runaway detection method further comprises:
acquiring a gas monitoring reference value sent by the gas reference monitoring module, wherein the gas monitoring reference value represents the gas condition at the second preset position;
and judging whether the currently determined thermal runaway judgment result is valid or not based on the gas monitoring reference values, the gas monitoring values and a preset false alarm prevention strategy.
8. The thermal runaway detection method of claim 7, wherein determining that the currently determined thermal runaway determination result is valid based on the gas monitoring reference value, each of the gas monitoring values, and a preset false alarm prevention policy comprises:
judging whether the gas monitoring reference value is larger than each gas monitoring value or not;
if not, the currently determined thermal runaway determination result is determined to be valid.
9. A thermal runaway detection system, characterized in that is applied to the control module in the battery compartment, still include a plurality of battery cabinets in the battery compartment, each battery cabinet's first default position department all is equipped with control module communication connection's gas monitoring module, thermal runaway detection system includes:
the first acquisition unit is used for acquiring the output voltage of each battery cabinet;
the second acquisition unit is used for acquiring the gas monitoring value sent by each gas monitoring module, and the gas monitoring value represents the gas condition at the first preset position of the corresponding battery cabinet;
and the judging unit is used for judging whether the corresponding battery cabinet is out of control or not based on the output voltage, the gas monitoring value and a preset detection and early warning strategy.
10. The battery compartment is characterized by comprising a control module and a plurality of battery cabinets, wherein a gas monitoring module in communication connection with the control module is arranged at a first preset position of each battery cabinet;
the control module is adapted to implement the steps of the thermal runaway detection method according to any one of claims 1 to 8 when executing a computer program.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117969760A (en) * | 2024-02-01 | 2024-05-03 | 广州邦禾检测技术有限公司 | Method for detecting thermal runaway gas of battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117969760A (en) * | 2024-02-01 | 2024-05-03 | 广州邦禾检测技术有限公司 | Method for detecting thermal runaway gas of battery |
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