CN113253119B - Battery burst type thermal runaway monitoring method and device and readable storage medium - Google Patents
Battery burst type thermal runaway monitoring method and device and readable storage medium Download PDFInfo
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- CN113253119B CN113253119B CN202110711799.5A CN202110711799A CN113253119B CN 113253119 B CN113253119 B CN 113253119B CN 202110711799 A CN202110711799 A CN 202110711799A CN 113253119 B CN113253119 B CN 113253119B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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- 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
Abstract
The disclosure relates to a method and a device for monitoring battery burst type thermal runaway and a readable storage medium, which are used for early warning the battery burst type thermal runaway in advance so as to effectively ensure the safety of a battery. Belongs to the technical field of battery management. The method comprises the following steps: acquiring current thermal runaway related parameters of a battery in a target working mode, wherein the current thermal runaway related parameters comprise at least one of a first parameter for representing a voltage change parameter under current change electric quantity, a second parameter for representing a temperature change parameter under current change electric quantity and a third parameter for representing the temperature change parameter under current change voltage; acquiring a parameter threshold corresponding to the current thermal runaway related parameter in a preset thermal runaway related parameter corresponding relation in the target working mode; and monitoring whether the battery has a thermal runaway risk or not according to the current thermal runaway related parameter and the parameter threshold.
Description
Technical Field
The disclosure relates to the technical field of battery management, in particular to a battery burst type thermal runaway monitoring method and device and a readable storage medium.
Background
Batteries have been widely used in electronic products such as mobile phones, notebook computers, electric shavers, and the like, and in devices such as electric automobiles, energy storage power stations, base station power supplies, and the like, but many fires and explosions caused by batteries have occurred. In general, a short circuit in a battery causes self-discharge abnormality of the battery and gradually develops thermal runaway (which may take several hours, days, or longer). Sometimes, however, the battery does not undergo a long development process before the thermal runaway, but the thermal runaway is formed instantly or in seconds, which is commonly called 'sudden death type' thermal runaway.
In addition to sudden thermal runaway that can occur during the use of the battery, it can sometimes occur during the battery production phase. For example, if a battery has a design or manufacturing defect, a sudden thermal runaway of the battery may occur in the processes of formation, capacity grading, high-temperature aging, and the like in the battery production stage, which may bring a great safety hazard to other adjacent batteries, equipment, production plants, and the like on the production line. Therefore, it is necessary to monitor the thermal runaway of the battery so as to give an early warning when the thermal runaway of the battery occurs in time, so as to ensure the safety of the battery.
Disclosure of Invention
The disclosure aims to provide a method and a device for monitoring a battery burst type thermal runaway and a readable storage medium, so as to early warn the battery burst type thermal runaway in advance and further effectively ensure the safety of a battery.
In order to achieve the above object, a first aspect of the present disclosure provides a battery burst-type thermal runaway monitoring method, including:
acquiring current thermal runaway related parameters of a battery in a target working mode, wherein the current thermal runaway related parameters comprise at least one of a first parameter for representing a voltage change parameter under current change electric quantity, a second parameter for representing a temperature change parameter under current change electric quantity and a third parameter for representing the temperature change parameter under current change voltage;
acquiring a parameter threshold corresponding to the current thermal runaway related parameter in a preset thermal runaway related parameter corresponding relation in the target working mode;
and monitoring whether the battery has a thermal runaway risk or not according to the current thermal runaway related parameter and the parameter threshold.
Optionally, the method further comprises:
determining whether a current voltage of the battery is within a preset voltage range;
the monitoring whether the battery has a thermal runaway risk or not according to the current thermal runaway related parameter and the parameter threshold comprises:
and if the current thermal runaway related parameter is within the preset voltage range, monitoring whether the thermal runaway risk exists in the battery or not according to the relationship among the current thermal runaway related parameter acquired this time, the thermal runaway related parameter acquired last time and the parameter threshold value.
Optionally, the current thermal runaway related parameter is the first parameter, and the thermal runaway related parameter corresponding relationship is a first corresponding relationship between a ratio of a change voltage to a change electric quantity and a battery electric quantity; the first correspondence is determined by:
determining the changed electric quantity of the battery according to the maximum capacity of the battery;
in the target working mode, when the battery is charged or discharged with the changed electric quantity every time, collecting first changed voltage generated by the battery under the changed electric quantity;
and determining the first corresponding relation according to the ratio of the first variation voltage to the variation electric quantity and the battery electric quantity.
Optionally, the current thermal runaway related parameter is the second parameter, and the thermal runaway related parameter corresponding relationship is a second corresponding relationship between a ratio of a change temperature to a change electric quantity and a battery electric quantity; the second correspondence is determined by:
determining the changed electric quantity of the battery according to the maximum capacity of the battery;
in the target working mode, when the battery is charged or discharged with the changed electric quantity every time, acquiring the changed temperature of the battery generated under the changed electric quantity;
and determining the second corresponding relation according to the ratio of the change temperature to the change electric quantity and the battery electric quantity.
Optionally, the current thermal runaway related parameter is the third parameter, and the thermal runaway related parameter corresponding relationship is a third corresponding relationship between a ratio of the change temperature to the second change voltage and the battery voltage; the third correspondence is determined by:
determining a second variation voltage of the battery according to the charge cut-off voltage and the discharge cut-off voltage of the battery;
in the target working mode, when the battery is charged or discharged with the second change voltage every time, collecting the change temperature of the battery generated under the change electric quantity;
and determining the third corresponding relation according to the ratio of the change temperature to the second change voltage and the battery voltage.
Optionally, the method further comprises:
in response to receiving an update request aiming at the corresponding relation of the thermal runaway related parameters, acquiring the corresponding relation of the target thermal runaway related parameters;
determining the corresponding relation of the target thermal runaway related parameters as a preset thermal runaway related parameter corresponding relation;
when the battery is in a production stage, the corresponding relation of the target thermal runaway related parameters is determined according to other batteries which are produced and have normal performance;
and when the battery is in a use stage, the corresponding relation of the target thermal runaway related parameters is determined according to the historical charging or discharging process of the battery.
Optionally, the monitoring whether the battery has a risk of thermal runaway according to the current thermal runaway related parameter and the parameter threshold includes:
and if the difference value of the current thermal runaway related parameter and the parameter threshold value exceeds a preset range, determining that the battery has a thermal runaway risk.
Optionally, the method further comprises:
under the condition that the battery is determined to have the thermal runaway risk, outputting prompt information for indicating to stop charging or discharging and/or outputting a thermal runaway early warning signal; and/or
Triggering a cooling or fire-fighting action if it is determined that the battery is at risk of thermal runaway.
A second aspect of the present disclosure provides a battery burst-type thermal runaway monitoring device, including:
the battery management system comprises a first obtaining module, a second obtaining module and a third obtaining module, wherein the first obtaining module is used for obtaining current thermal runaway related parameters of a battery in a target working mode, and the current thermal runaway related parameters comprise at least one of a first parameter used for representing a voltage change parameter under current change electric quantity, a second parameter used for representing a temperature change parameter under current change electric quantity and a third parameter used for representing a temperature change parameter under current change voltage;
the second obtaining module is used for obtaining a parameter threshold corresponding to the current thermal runaway related parameter in a preset thermal runaway related parameter corresponding relation in the target working mode;
and the monitoring module is used for monitoring whether the battery has a thermal runaway risk or not according to the current thermal runaway related parameter and the parameter threshold.
A third aspect of the present disclosure provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method provided by the first aspect of the present disclosure.
A fourth aspect of the present disclosure provides an electronic device, comprising:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of the method provided by the first aspect of the present disclosure.
Through the technical scheme, the thermal runaway of the battery is monitored according to the current thermal runaway related parameters of the battery in the target working mode and the parameter threshold corresponding to the current thermal runaway related parameters, the thermal runaway of the battery can be monitored in advance, the thermal runaway of the battery can be effectively prevented, and the safety of the battery is effectively guaranteed. In addition, because the thermal runaway of the battery is not monitored by using the difference between the battery cells in the series battery pack, the accuracy of monitoring the sudden thermal runaway of the battery is not influenced by the inconsistency between the battery cells, and the accuracy of monitoring the sudden thermal runaway of the battery is improved.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure.
Fig. 1 is a flow chart illustrating a method for battery thermal burst-type runaway monitoring, according to an exemplary embodiment.
Fig. 2 is a flow chart illustrating another method for battery burst-type thermal runaway monitoring, according to an exemplary embodiment.
Fig. 3 is a block diagram illustrating a battery burst-type thermal runaway monitoring device, according to an exemplary embodiment.
FIG. 4 is a block diagram illustrating an electronic device in accordance with an example embodiment.
Detailed Description
In the related art, a method for diagnosing battery faults according to voltage difference, temperature difference and SOC (State of Charge) difference among cells in a battery pack is mainly used for diagnosing battery micro short circuit and warning thermal runaway which is formed only when a battery needs to develop for a long time, generally, the time required for diagnosis is long, and sometimes, the faults can be warned only when voltage and temperature change greatly, and warning cannot be given to the thermal runaway of a sudden battery.
For example, an internal short circuit detection algorithm is provided for a series battery pack, the diagnosis method needs to compare each battery cell in the series battery pack, and needs to calculate the position or slope of a characteristic peak of dQ/dV (wherein dQ represents the change of the electric quantity of the battery, and dV represents the change of the voltage of the battery) as a characteristic, but the characteristic peak of dQ/dV can be generally obtained only under the condition of low-rate current, and the characteristic peak of dQ/dV can be weakened or even disappear under the condition of high-rate charge and discharge, and some peaks can disappear as the battery ages. Therefore, the internal short circuit detection algorithm cannot accurately monitor the thermal runaway of the battery, and in the related art, the thermal runaway of the battery cannot be early warned in advance, so that the safety of the battery cannot be guaranteed.
In view of this, the present disclosure provides a method and an apparatus for monitoring a battery burst-type thermal runaway, and a readable storage medium, so as to early warn the battery burst-type thermal runaway in advance, thereby effectively ensuring the safety of the battery.
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a flow chart illustrating a battery burst-type thermal runaway monitoring method according to an exemplary embodiment. As shown in fig. 1, the method may include the following steps.
In step 101, a current thermal runaway related parameter of the battery in the target operating mode is obtained, where the current thermal runaway related parameter includes at least one of a first parameter for characterizing a voltage variation parameter at a current variation capacity, a second parameter for characterizing a temperature variation parameter at the current variation capacity, and a third parameter for characterizing the temperature variation parameter at the current variation voltage.
The first parameter may be a voltage variation parameter dV under the current variation electric quantity dQ, or may be a ratio dV/dQ of the voltage variation parameter dV to the current variation electric quantity dQ. Similarly, the second parameter may be a temperature variation parameter dT of the current variation electric quantity dQ, or may be a ratio of the temperature variation parameter dT to the current variation electric quantity dQ. The third parameter may be a temperature variation parameter dT of the current variation voltage dv, or may be a ratio dT/dv between the temperature variation parameter dT and the current variation voltage dv (where, each time the third parameter is calculated, the current variation voltage dv of the battery is a fixed voltage variation obtained in advance). The first parameter, the second parameter, and the third parameter are not particularly limited by the present disclosure. In addition, the target operation mode may be any one of a constant current charging mode, a constant current discharging mode, a constant power charging mode, a constant power discharging mode, and a pulse charging mode.
In step 102, a parameter threshold corresponding to the current thermal runaway related parameter is obtained in a preset thermal runaway related parameter corresponding relationship in the target working mode.
In this disclosure, the correspondence relationship between the thermal runaway related parameters in the target operating mode is preset, so that after the current thermal runaway related parameters in the target operating mode are obtained in step 101, the parameter threshold corresponding to the current thermal runaway related parameters can be obtained from the preset correspondence relationship between the thermal runaway related parameters.
In step 103, whether the battery has a thermal runaway risk is monitored according to the current thermal runaway related parameters and parameter thresholds.
For example, if the difference value between the current thermal runaway related parameter and the parameter threshold exceeds a preset range, it is determined that the battery has a thermal runaway risk.
It is worth noting that the inventors obtained voltage change curves of the battery during 12 charging cycles, and found that sudden thermal runaway occurred simultaneously with sudden voltage drop at the end of the last charging cycle (12 th cycle), and although slight abnormality occurred at about 4.076V, the deviation from the previous voltage during the charge-discharge cycle was about 10 mV. However, since it is common in the battery pack that the deviation between the battery cells is several tens mV, it is impossible to recognize the thermal runaway abnormality by the cell voltage difference. In contrast, the inventors separately obtained dV/dQ curves of the battery during 12 times of charging, and from the 12 dV/dQ curves, it was found that the dV/dQ value exhibited a significant abnormality before the voltage of the battery suddenly dropped, whereby sudden thermal runaway of the battery could be monitored four minutes earlier. Therefore, the aim of early warning can be achieved by monitoring the battery burst type thermal runaway through the dV/dQ curve of the battery.
In addition, the inventor respectively obtains the temperature change curves of the battery in the 12 charging processes, and finds that the battery is subjected to instant fire and explosion after the temperature difference between the 12 th charging final-stage temperature and the temperature difference during the previous charging is 2-3 ℃. However, even if the temperature of each battery can be collected on a real vehicle, since the temperature difference of about 5 ℃ exists between the single cells in the real vehicle environment, the battery pack or the electric vehicle cannot give an early warning for thermal runaway according to the temperature difference between the single cells. In contrast, the inventor respectively obtains dT/dQ curves of the battery in 12 charging processes, finds that the dT/dQ value shows obvious abnormality before voltage sudden drop, and can monitor sudden thermal runaway of the battery in three minutes in advance. Therefore, the aim of early warning can be achieved by monitoring the battery burst type thermal runaway through the dT/dQ curve of the battery.
Similarly, the inventor respectively obtains dT/dv curves of the battery in 12 charging processes (wherein, in each charging process, a dT/dv value is calculated for a plurality of times, and in each calculation, the current change voltage dv of the battery is a fixed voltage change amount obtained by pre-calculation), and finds that the dT/dv value shows obvious abnormality before voltage sudden drop, so that the sudden thermal runaway of the battery can be monitored in three minutes in advance. Therefore, the aim of early warning can be achieved by monitoring the battery burst type thermal runaway through the dT/dv curve of the battery.
By adopting the technical scheme, the thermal runaway of the battery is monitored according to the current thermal runaway related parameter of the battery in the target working mode and the parameter threshold corresponding to the current thermal runaway related parameter, the thermal runaway of the battery can be monitored in advance, the thermal runaway of the battery can be effectively prevented, and the safety of the battery is effectively ensured. In addition, because the thermal runaway of the battery is not monitored by using the difference between the battery cells in the series battery pack, the accuracy of monitoring the sudden thermal runaway of the battery is not influenced by the inconsistency between the battery cells, and the accuracy of monitoring the sudden thermal runaway of the battery is improved.
The following describes in detail a determination method of the preset thermal runaway related parameter corresponding relationship in the target operating mode.
In one embodiment, the current thermal runaway related parameter is a first parameter dV/dQ, and accordingly, the thermal runaway related parameter corresponding relationship is a first corresponding relationship between a ratio of a variation voltage to a variation electric quantity and a battery electric quantity, and the first corresponding relationship may be determined as follows.
(1) And determining the changed electric quantity of the battery according to the maximum capacity of the battery.
For example, the maximum capacity Q of the battery is divided by n to obtain the variable electric quantity dQ of the battery, where n generally takes a value of 100.
(2) In the target working mode, when the battery changes the electric quantity every time the battery is charged or discharged, first change voltage generated by the battery under the change electric quantity is collected.
(3) And determining a first corresponding relation according to the ratio of the first change voltage to the change electric quantity and the battery electric quantity.
It should be noted that the first parameter dV/dQ obtained in step 101 in fig. 1 is obtained when the battery is in the target operation mode, and therefore, the first corresponding relationship between the ratio of the variation voltage to the variation electric quantity and the battery electric quantity is also determined in the target operation mode.
If the target working mode is any one of constant current charging, constant power charging and pulse charging modes, when the battery is charged with the dQ electric quantity, the battery voltage charged with the electric quantity is subtracted from the battery voltage charged with the electric quantity to obtain a first change voltage dV, the battery is charged until the battery is charged to a charging cut-off voltage, n dVs can be obtained, and then each dV is divided by dQ to obtain n dV/dQ values. That is, dV/dQ values during the periods from 0 to dQ, dQ to 2dQ, … …, (n-1) dQ to ndQ, respectively, are obtained. And finally, obtaining a first corresponding relation between the ratio of the change voltage to the change electric quantity and the electric quantity of the battery through interpolation.
If the target working mode is a constant current discharge mode or a constant power discharge mode, discharging is started from a battery charging cut-off voltage, every time the battery discharges dQ electric quantity, a first change voltage dV is obtained by subtracting the battery voltage before the electric quantity is discharged from the battery voltage after the electric quantity is discharged, the battery is discharged until the discharging cut-off voltage, n dVs can be obtained, and then, each dV is divided by dQ to obtain n dV/dQ values. That is, dV/dQ values during the periods from 0 to dQ, dQ to 2dQ, … …, (n-1) dQ to ndQ, respectively, are obtained. And finally, obtaining a first corresponding relation between the ratio of the change voltage to the change electric quantity and the electric quantity of the battery through interpolation.
It should be noted that the battery used for determining the first corresponding relationship is a battery that does not generate thermal runaway, and the battery mentioned in each step in fig. 1 may be the same battery or a battery of the same batch, which is not limited in this disclosure.
In this embodiment, when the thermal runaway of the battery is monitored, when the battery is charged or discharged, the charge Q of the battery is first obtained by the battery monitoring systemiAnd a voltage ViThen, the battery is charged or discharged with a certain amount of electricity dQ, and a voltage V after the charging or discharging of the certain amount of electricity dQ is obtainedi+1After that, the voltage V is appliedi+1Minus the voltage ViObtain the current variation electric quantity (from Q)iChange to QiVoltage variation parameter dV (from V) at ± dQ)iChange to Vi+1) And the voltage variation parameter dV and the current variation electric quantity (from Q)iChange to Qi± dQ) is determined as the first parameter.
Finally, determining the electric quantity Q from the first corresponding relation stored in advanceiChange to QiAnd the dV/dQ value at +/-dQ is determined as a parameter threshold value corresponding to the first parameter. And when the difference value of the first parameter and the parameter threshold value exceeds a preset range, determining that the battery has the thermal runaway risk.
In another embodiment, the current parameter related to thermal runaway is a second parameter dT/dQ, and accordingly, the corresponding relationship of the parameter related to thermal runaway is a second corresponding relationship between a ratio of a change temperature to a change electric quantity and an electric quantity of the battery, and the second corresponding relationship may be determined in the following manner.
(4) And determining the changed electric quantity of the battery according to the maximum capacity of the battery.
(5) In the target working mode, when the battery changes the electric quantity every time the battery is charged or discharged, the collection battery generates the change temperature under the change electric quantity.
(6) And determining a second corresponding relation according to the ratio of the change temperature to the change electric quantity and the battery electric quantity.
If the target working mode is any one of constant current charging, constant power charging and pulse charging modes, every time the battery is charged with the dQ electric quantity, the battery temperature after the electric quantity is charged is subtracted from the battery temperature before the electric quantity is charged to obtain a change temperature dT, the battery is charged until the charging cut-off voltage is reached, n dT can be obtained, and then each dT is divided by dQ to obtain n dT/dQ values. That is, dT/dQ values during the periods from 0 to dQ, dQ to 2dQ, … …, (n-1) dQ to ndQ, respectively, are obtained. And finally, obtaining a second corresponding relation between the ratio of the change temperature to the change electric quantity and the electric quantity of the battery through interpolation.
Similarly, if the target operation mode is a constant current discharge mode or a constant power discharge mode, the second corresponding relationship between the ratio of the change temperature to the change electric quantity and the electric quantity of the battery can be obtained by referring to the above manner.
In this embodiment, when the thermal runaway of the battery is monitored, when the battery is charged or discharged, the charge Q of the battery is first obtained by the battery monitoring systemiAnd temperature TiThen, charging or discharging a certain amount of electricity dQ to the battery to obtain a temperature T after charging or discharging the certain amount of electricity dQi+1After that, the temperature T is measuredi+1Minus the temperature TiObtain the current variation electric quantity (from Q)iChange to QidT) and the temperature change parameter dT is compared with the current change electric quantity (from Q)iChange to Qi± dQ) is determined as the second parameter.
Finally, the electric quantity Q is determined from the pre-stored second corresponding relationiChange to QiAnd the dT/dQ value at +/-dQ is determined as the parameter threshold corresponding to the second parameter. And when the difference value of the second parameter and the parameter threshold value exceeds a preset range, determining that the battery has the thermal runaway risk.
In another embodiment, the current thermal runaway related parameter is a third parameter dT/dv, and the thermal runaway related parameter correspondence is a third correspondence between a ratio of the variation temperature to the second variation voltage and the battery voltage; the third correspondence is determined in the following manner.
(7) And determining a second variation voltage of the battery according to the charge cut-off voltage and the discharge cut-off voltage of the battery.
For example, assuming that the charge cut-off voltage of the battery is Vch and the discharge cut-off voltage is Vdch, the second variation voltage dv = (Vch-Vdch)/n of the battery is generally 100.
(8) And in the target working mode, when the battery is charged or discharged for the second change voltage every time, acquiring the change temperature of the battery generated under the change voltage.
(9) And determining a third corresponding relation according to the ratio of the change temperature to the second change voltage and the battery voltage.
If the target working mode is any one of the constant current charging mode, the constant power charging mode and the pulse charging mode, every time the battery voltage increases by the second change voltage dv, the battery temperature before the voltage increases is subtracted from the battery temperature after the voltage increases to obtain a change temperature dT, the battery is charged until the charge cut-off voltage, n dT can be obtained, and then each dT is divided by dv to obtain n dT/dv values. That is, values of dT/dv during the periods from Vdch to Vdch + dv, Vdch + dv to Vdch +2dv, … …, and Vdch + (n-1) dv to Vch, respectively, were obtained. And finally, obtaining a third corresponding relation between the ratio of the change temperature to the second change voltage and the battery voltage through interpolation.
Similarly, if the target operation mode is the constant current discharge mode or the constant power discharge mode, the third corresponding relationship between the ratio of the variation temperature to the second variation voltage and the battery voltage can also be obtained by referring to the above manner.
In this embodiment, when monitoring thermal runaway of the battery, when the battery is being charged or discharged, the voltage V of the battery is first obtained by the battery monitoring systemiAnd temperature TiThen, the battery is charged or discharged so that the voltage changes dv, and the temperature T after the voltage change dv is obtainedi+1After that, the temperature T is measuredi+1Minus the temperature TiObtain the current variation voltage (from V)iChange to VidT) and the temperature is adjustedDegree change parameter dT and present change voltage (from V)iChange to ViDv) is determined as the third parameter.
Finally, from the third correspondence stored in advance, the voltage V is determinediChange to ViAnd the dT/dv value at +/-dv is determined as a parameter threshold value corresponding to the third parameter. And when the difference value of the third parameter and the parameter threshold value exceeds a preset range, determining that the battery has the thermal runaway risk.
It should be noted that after the first corresponding relationship, the second corresponding relationship, or the third corresponding relationship in the target working mode is obtained in the above manner, the corresponding relationship may be stored in a Battery monitoring System, such as a production line formation device, a capacity division control device, an MES (Manufacturing Execution System), a BMS (Battery Management System), or a cloud control platform, for standby.
In addition, after the thermal runaway related parameter corresponding relationship is determined according to the above manner, in order to ensure the accuracy of the thermal runaway related parameter corresponding relationship, the thermal runaway related parameter corresponding relationship may be updated after a period of time.
The process of updating the corresponding relation of the thermal runaway related parameters comprises the following steps: and responding to a received updating request aiming at the corresponding relation of the thermal runaway related parameters, acquiring the corresponding relation of the target thermal runaway related parameters, and then determining the corresponding relation of the target thermal runaway related parameters as a preset corresponding relation of the thermal runaway related parameters. Therefore, the corresponding relation of the thermal runaway related parameters can be updated.
It is worth noting that the battery burst type thermal runaway monitoring method provided by the present disclosure can be used for monitoring a battery in a use stage and can also be used for monitoring a battery in a production stage. When the batteries in the production stage are monitored, the corresponding relation of the thermal runaway related parameters determined by the batteries which are produced and have normal performance and are in the same batch is updated. And when the battery in the use stage is monitored, the battery is updated according to the corresponding relation of the thermal runaway related parameters determined in the historical charging or discharging process of the battery. Therefore, when the correlation of the thermal runaway related parameters is updated, the updating manner for the battery in the production stage and the updating manner for the battery in the use stage are not completely the same.
For example, for a battery in a production stage, in a battery production process, if a raw material batch is changed and a battery production process is fine-tuned, a thermal runaway related parameter corresponding relationship of the battery changes, if an original thermal runaway related parameter corresponding relationship is still used for performing thermal runaway monitoring, a result of erroneous judgment is caused, and accuracy of a battery sudden thermal runaway early warning is poor, so that the thermal runaway related parameter corresponding relationship of the battery needs to be updated after the raw material batch is changed, the battery production process is fine-tuned, and production equipment is aged. For example, when a raw material batch is changed, a battery production process is trimmed, and production equipment is aged, a technician may send an update request to equipment that executes the battery burst-type thermal runaway monitoring method, so as to request an update of the thermal runaway related parameter correspondence. After receiving an update request sent by a technician, the equipment executing the battery burst type thermal runaway monitoring method controls other produced batteries with normal performance to be charged or discharged in different working modes so as to obtain the corresponding relation of the target thermal runaway related parameters in different working modes, and updates the corresponding relation of the thermal runaway related parameters. The other batteries are batteries of the same batch as the battery in the production stage.
Aiming at a battery in a use stage, the corresponding relation of thermal runaway related parameters of the battery can also change under the influence of factors such as battery aging, temperature and the like in the use process of the battery, if the original corresponding relation of the thermal runaway related parameters is still used for carrying out thermal runaway monitoring, misjudgment results can be caused, and the accuracy of early warning of the sudden thermal runaway of the battery is poor, so that after the battery is used for a period of time or the battery is attenuated to a certain extent, an updating request can be automatically generated and sent to equipment for executing the monitoring method of the sudden thermal runaway of the battery. After the equipment executing the battery burst type thermal runaway monitoring method receives the updating request, the corresponding relation of the thermal runaway related parameters determined in the historical charging or discharging process of the battery is determined as the corresponding relation of the target thermal runaway related parameters, and the corresponding relation of the thermal runaway related parameters is updated according to the corresponding relation.
It should be noted that, because the battery is generally not charged from zero to full charge (or discharged from full to zero) during each charging process in the actual use process, the actual charging/discharging voltage interval or SOC interval has randomness, and therefore, in the actual application, the updating of the corresponding relationship of the thermal runaway related parameters is completed by using the historical charging/discharging data of different times. For example, a primary charging/discharging data which is longer in charging time and closer to the current moment in the period from the current moment to the moment when the corresponding relation of the thermal runaway related parameters is updated last time is found out on the battery monitoring system, the corresponding relation of the thermal runaway related parameters in the same electric quantity interval or voltage interval in the corresponding relation of the thermal runaway related parameters is replaced by the corresponding relation of the actual thermal runaway related parameters, and the corresponding relation of the thermal runaway related parameters of the complete electric quantity interval or complete voltage interval of the battery is updated through a plurality of times of historical charging/discharging data. In addition, because the energy of the high-voltage interval of the battery is higher, the internal expansion force of the battery is larger, and sudden thermal runaway of the battery is more easily caused, when the corresponding relation of the thermal runaway related parameters is updated, the corresponding relation of the thermal runaway related parameters of the high-voltage or high-power interval is updated in a key and priority mode.
Therefore, the accuracy of the corresponding relation of the thermal runaway related parameters used when the thermal runaway of the battery burst type is monitored can be ensured by updating the corresponding relation of the thermal runaway related parameters, and the accuracy of monitoring the thermal runaway of the battery burst type is further improved.
Fig. 2 is a flow chart illustrating another method for battery burst-type thermal runaway monitoring, according to an exemplary embodiment. As shown in fig. 2, the method may further include step 104 in addition to step 101 and step 102 described above.
In step 104, it is determined whether the current voltage of the battery is within a preset voltage range.
For example, the preset voltage range is a preset high voltage range, wherein the high voltage range can be set according to actual requirements, and the disclosure does not specifically limit this.
Correspondingly, step 103 in fig. 1 may further include step 1031.
In step 1031, if the current parameter is within the preset voltage range, whether the battery has a risk of thermal runaway is monitored according to the relationship among the current parameter related to thermal runaway, the last parameter related to thermal runaway, and the parameter threshold.
In a possible mode, if the current voltage of the battery is within a preset voltage range, that is, the current voltage is considered to be within a high voltage region, when a difference value between the current thermal runaway related parameter obtained this time and the parameter threshold exceeds a preset range, or when a difference value between the current thermal runaway related parameter obtained this time and the thermal runaway related parameter obtained last time exceeds a certain range, it is determined that the battery has a thermal runaway risk.
In another possible mode, if the current voltage of the battery is within a preset voltage range, that is, the current voltage is considered to be within a high voltage region, when the difference between the current thermal runaway related parameter obtained this time and the parameter threshold exceeds a preset range, and when the difference between the current thermal runaway related parameter obtained this time and the thermal runaway related parameter obtained last time exceeds a certain range, it is determined that the battery has a thermal runaway risk.
Therefore, when the current voltage of the battery is within the preset voltage range, the thermal runaway is monitored in an all-around mode through a plurality of characteristics, and the report missing rate of the thermal runaway is lower.
After the battery is determined to have the risk of thermal runaway according to the method shown in fig. 1 or fig. 2, corresponding actions can be further triggered so as to early warn or protect the thermal runaway of the battery.
For example, in one possible mode, in the case that the battery is determined to have the thermal runaway risk, prompt information for prompting the stop of charging or discharging is output, and/or a thermal runaway early warning signal is output to prompt a user that the battery has the thermal runaway risk. The prompt information may be a voice prompt or a text prompt, which is not limited in this disclosure. Likewise, the warning signal for thermal runaway may be a warning signal emitted by an alarm, which may be an acoustic warning signal and/or an optical warning signal, and this disclosure is not limited thereto.
In another possible way, in case it is determined that there is a risk of thermal runaway of the battery, a cooling or fire fighting action may be triggered directly to cool the battery or to ensure the safety of the equipment around the battery by triggering a fire fighting action.
In a further possible mode, in the case that the battery is determined to have the thermal runaway risk, prompt information for indicating that charging or discharging is stopped is output, and/or a thermal runaway early warning signal is output, and meanwhile, a cooling or fire fighting action is triggered.
By adopting the technical scheme, under the condition that the thermal runaway risk of the battery is determined, the prompt information and/or the early warning signal can be output, so that a user can know that the thermal runaway risk of the battery exists in advance, and further, corresponding measures can be effectively taken to ensure the safety of the battery. In addition, under the condition that the battery is determined to have the risk of thermal runaway, the cooling or fire fighting action can be automatically triggered, and the flexibility and the intelligent degree of the battery burst type thermal runaway monitoring method are improved.
Based on the same inventive concept, the disclosure also provides a device for monitoring the thermal runaway of the battery burst type. Fig. 3 is a block diagram illustrating a battery burst-type thermal runaway monitoring device, according to an exemplary embodiment. As shown in fig. 3, the battery burst type thermal runaway monitoring device 300 may include:
a first obtaining module 301, configured to obtain a current thermal runaway related parameter of the battery in a target operating mode, where the current thermal runaway related parameter includes at least one of a first parameter used for characterizing a voltage variation parameter under a current variation electric quantity, a second parameter used for characterizing a temperature variation parameter under the current variation electric quantity, and a third parameter used for characterizing the temperature variation parameter under the current variation voltage;
a second obtaining module 302, configured to obtain, in a preset thermal runaway related parameter corresponding relationship in the target operating mode, a parameter threshold corresponding to the current thermal runaway related parameter;
and the monitoring module 303 is configured to monitor whether the battery has a risk of thermal runaway according to the current thermal runaway related parameter and the parameter threshold.
Optionally, the apparatus may further include:
the first determination module is used for determining whether the current voltage of the battery is within a preset voltage range;
the monitoring module 303 is configured to: and if the current thermal runaway related parameter is within the preset voltage range, monitoring whether the thermal runaway risk exists in the battery or not according to the relationship among the current thermal runaway related parameter acquired this time, the thermal runaway related parameter acquired last time and the parameter threshold value.
Optionally, the current thermal runaway related parameter is the first parameter, and the thermal runaway related parameter corresponding relationship is a first corresponding relationship between a ratio of a change voltage to a change electric quantity and a battery electric quantity; the first correspondence is determined by:
determining the changed electric quantity of the battery according to the maximum capacity of the battery;
in the target working mode, when the battery is charged or discharged with the changed electric quantity every time, collecting first changed voltage generated by the battery under the changed electric quantity;
and determining the first corresponding relation according to the ratio of the first variation voltage to the variation electric quantity and the battery electric quantity.
Optionally, the current thermal runaway related parameter is the second parameter, and the thermal runaway related parameter corresponding relationship is a second corresponding relationship between a ratio of a change temperature to a change electric quantity and a battery electric quantity; the second correspondence is determined by:
determining the changed electric quantity of the battery according to the maximum capacity of the battery;
in the target working mode, when the battery is charged or discharged with the changed electric quantity every time, acquiring the changed temperature of the battery generated under the changed electric quantity;
and determining the second corresponding relation according to the ratio of the change temperature to the change electric quantity and the battery electric quantity.
Optionally, the current thermal runaway related parameter is the third parameter, and the thermal runaway related parameter corresponding relationship is a third corresponding relationship between a ratio of the change temperature to the second change voltage and the battery voltage; the third correspondence is determined by:
determining a second variation voltage of the battery according to the charge cut-off voltage and the discharge cut-off voltage of the battery;
in the target working mode, when the battery is charged or discharged with the second change voltage every time, collecting the change temperature of the battery generated under the change electric quantity;
and determining the third corresponding relation according to the ratio of the change temperature to the second change voltage and the battery voltage.
Optionally, the apparatus may further include:
a third obtaining module, configured to obtain a target thermal runaway related parameter corresponding relationship in response to receiving an update request for the thermal runaway related parameter corresponding relationship;
the second determination module is used for determining the corresponding relation of the target thermal runaway related parameters as a preset thermal runaway related parameter corresponding relation;
when the battery is in a production stage, the corresponding relation of the target thermal runaway related parameters is determined according to other batteries which are produced and have normal performance;
and when the battery is in a use stage, the corresponding relation of the target thermal runaway related parameters is determined according to the historical charging or discharging process of the battery.
Optionally, the monitoring module 303 is configured to: and if the difference value of the current thermal runaway related parameter and the parameter threshold value exceeds a preset range, determining that the battery has a thermal runaway risk.
Optionally, the apparatus may further include:
the output module is used for outputting prompt information used for indicating to stop charging or discharging and/or outputting a thermal runaway early warning signal under the condition that the thermal runaway risk of the battery is determined; and/or
And the triggering module is used for triggering a cooling or fire-fighting action under the condition that the battery is determined to have the thermal runaway risk.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
FIG. 4 is a block diagram illustrating an electronic device in accordance with an example embodiment. As shown in fig. 4, the electronic device 700 may include: a processor 701 and a memory 702. The electronic device 700 may also include one or more of a multimedia component 703, an input/output (I/O) interface 704, and a communication component 705.
The processor 701 is configured to control the overall operation of the electronic device 700, so as to complete all or part of the steps in the battery burst-type thermal runaway monitoring method. The memory 702 is used to store various types of data to support operation at the electronic device 700, such as instructions for any application or method operating on the electronic device 700 and application-related data, such as contact data, transmitted and received messages, pictures, audio, video, and the like. The Memory 702 may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk, or optical disk. The multimedia components 703 may include screen and audio components. Wherein the screen may be, for example, a touch screen and the audio component is used for outputting and/or inputting audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signal may further be stored in the memory 702 or transmitted through the communication component 705. The audio assembly also includes at least one speaker for outputting audio signals. The I/O interface 704 provides an interface between the processor 701 and other interface modules, such as a keyboard, mouse, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 705 is used for wired or wireless communication between the electronic device 700 and other devices. Wireless Communication, such as Wi-Fi, bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or a combination of one or more of them, which is not limited herein. The corresponding communication component 705 may thus include: Wi-Fi module, Bluetooth module, NFC module, etc.
In an exemplary embodiment, the electronic Device 700 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components for performing the battery burst type thermal runaway monitoring method described above.
In another exemplary embodiment, a computer readable storage medium comprising program instructions which, when executed by a processor, implement the steps of the battery burst-type thermal runaway monitoring method described above is also provided. For example, the computer readable storage medium may be the memory 702 comprising program instructions executable by the processor 701 of the electronic device 700 to perform the battery burst-type thermal runaway monitoring method described above.
In another exemplary embodiment, a computer program product is also provided, which comprises a computer program executable by a programmable apparatus, the computer program having code portions for performing the above-mentioned battery burst-type thermal runaway monitoring method when executed by the programmable apparatus.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (7)
1. A method for monitoring sudden thermal runaway of a battery is characterized by comprising the following steps:
acquiring current thermal runaway related parameters of a battery in a target working mode, wherein the current thermal runaway related parameters comprise at least one of a first parameter for representing a voltage change parameter under current change electric quantity, a second parameter for representing a temperature change parameter under current change electric quantity and a third parameter for representing the temperature change parameter under current change voltage;
acquiring a parameter threshold corresponding to the current thermal runaway related parameter in a preset thermal runaway related parameter corresponding relation in the target working mode;
monitoring whether the battery has a thermal runaway risk or not according to the current thermal runaway related parameter and the parameter threshold;
under the condition that the current thermal runaway related parameter comprises the first parameter, the corresponding relation of the thermal runaway related parameter comprises a first corresponding relation between the ratio of the change voltage to the change electric quantity and the electric quantity of the battery; the first correspondence is determined by:
determining the changed electric quantity of the battery according to the maximum capacity of the battery;
in the target working mode, when the battery is charged or discharged with the changed electric quantity every time, collecting first changed voltage generated by the battery under the changed electric quantity;
determining the first corresponding relation according to the ratio of the first variation voltage to the variation electric quantity and the battery electric quantity;
under the condition that the current thermal runaway related parameter comprises the second parameter, the corresponding relation of the thermal runaway related parameter is a second corresponding relation between the ratio of the change temperature to the change electric quantity and the electric quantity of the battery; the second correspondence is determined by:
determining the changed electric quantity of the battery according to the maximum capacity of the battery;
in the target working mode, when the battery is charged or discharged with the changed electric quantity every time, acquiring the changed temperature of the battery generated under the changed electric quantity;
determining the second corresponding relation according to the ratio of the change temperature to the change electric quantity and the battery electric quantity;
under the condition that the current thermal runaway related parameter comprises the third parameter, the thermal runaway related parameter corresponding relation is a third corresponding relation between the ratio of the change temperature to the second change voltage and the battery voltage; the third correspondence is determined by:
determining a second variation voltage of the battery according to the charge cut-off voltage and the discharge cut-off voltage of the battery;
in the target working mode, when the battery is charged or discharged with the second change voltage every time, collecting the change temperature of the battery generated under the change electric quantity;
and determining the third corresponding relation according to the ratio of the change temperature to the second change voltage and the battery voltage.
2. The method of claim 1, further comprising:
determining whether a current voltage of the battery is within a preset voltage range;
the monitoring whether the battery has a thermal runaway risk or not according to the current thermal runaway related parameter and the parameter threshold comprises:
and if the current thermal runaway related parameter is within the preset voltage range, monitoring whether the thermal runaway risk exists in the battery or not according to the relationship among the current thermal runaway related parameter acquired this time, the thermal runaway related parameter acquired last time and the parameter threshold value.
3. The method of claim 1, further comprising:
in response to receiving an update request aiming at the corresponding relation of the thermal runaway related parameters, acquiring the corresponding relation of the target thermal runaway related parameters;
determining the corresponding relation of the target thermal runaway related parameters as a preset thermal runaway related parameter corresponding relation;
when the battery is in a production stage, the corresponding relation of the target thermal runaway related parameters is determined according to other batteries which are produced and have normal performance;
and when the battery is in a use stage, the corresponding relation of the target thermal runaway related parameters is determined according to the historical charging or discharging process of the battery.
4. The method according to any one of claims 1-3, wherein the monitoring whether the battery is at risk of thermal runaway according to the current thermal runaway related parameter and the parameter threshold comprises:
and if the difference value of the current thermal runaway related parameter and the parameter threshold value exceeds a preset range, determining that the battery has a thermal runaway risk.
5. The method according to any one of claims 1-3, further comprising:
under the condition that the battery is determined to have the thermal runaway risk, outputting prompt information for indicating to stop charging or discharging and/or outputting a thermal runaway early warning signal; and/or
Triggering a cooling or fire-fighting action if it is determined that the battery is at risk of thermal runaway.
6. A battery burst-type thermal runaway monitoring device, characterized in that it is configured to perform the steps of the method according to any one of claims 1-5.
7. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 5.
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| CN114184964B (en) * | 2021-12-08 | 2023-08-29 | 蜂巢能源科技(无锡)有限公司 | Method and device for evaluating internal temperature distribution of battery cell |
| CN114970734A (en) * | 2022-06-09 | 2022-08-30 | 清华大学 | Abnormal battery determination method, abnormal battery determination device, computer equipment and storage medium |
| CN115184808A (en) * | 2022-07-05 | 2022-10-14 | 东莞新能安科技有限公司 | Battery thermal runaway risk detection method, device, equipment and computer storage medium |
| CN116109146B (en) * | 2023-04-12 | 2023-06-09 | 国网安徽省电力有限公司合肥供电公司 | Safety analysis and evaluation method for large-scale battery energy storage power station |
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| CN116500459B (en) * | 2023-06-28 | 2023-08-29 | 中汽研汽车检验中心(常州)有限公司 | Lithium battery safety performance evaluation method and device, storage medium and electronic equipment |
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