CN112952221A - Power battery thermal runaway multi-stage early warning method and system - Google Patents
Power battery thermal runaway multi-stage early warning method and system Download PDFInfo
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- 230000007958 sleep Effects 0.000 claims description 21
- 230000005059 dormancy Effects 0.000 claims description 9
- 238000003745 diagnosis Methods 0.000 description 8
- 238000012423 maintenance Methods 0.000 description 4
- 239000002243 precursor Substances 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
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- 230000009286 beneficial effect Effects 0.000 description 1
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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
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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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
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/488—Cells or batteries combined with indicating means for external visualization of the condition, e.g. by change of colour or of light density
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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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
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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
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Abstract
The invention relates to the field of thermal runaway of batteries, in particular to a multi-stage early warning method and system for thermal runaway of a power battery. The power battery thermal runaway multi-stage early warning method comprises the following steps: a fuse is arranged in each battery module and arranged around each battery cell; the fuses of each battery module are connected through wires to form a circuit for connecting a power supply and the ground; collecting monitoring point voltage, wherein the monitoring point voltage is different before and after the fuse is fused; and judging whether the voltage of the monitoring point is changed from a first preset voltage to a second preset voltage, if so, acquiring the monomer pressure difference, judging whether the monomer pressure difference is increased by a preset value, and if so, judging that the thermal runaway is caused. Through the steps, the thermal runaway can be accurately judged, only one monitoring point is needed, and the cost is low.
Description
Technical Field
The invention relates to the field of thermal runaway of batteries, in particular to a multi-stage early warning method and system for thermal runaway of a power battery.
Background
Patent application No. CN111370784A discloses a thermal runaway warning scheme, which specifically includes: arranging a fusing conductor inside the module; setting a plurality of fusing conductor voltage monitoring points; observing the voltage change of the single body according to the change of the voltage monitoring point data; when the data of the monitoring point changes and the voltage of the single body is 0, the thermal runaway is judged to occur. And sending out a thermal runaway early warning.
The above technical solution has the following disadvantages:
disadvantage 1:
the newly added voltage detection positions are numerous, the acquisition cost is increased greatly, the number of the links or welding interfaces of the lead wires of the acquisition points is large, the process is difficult, and the mass production is not feasible.
And (2) disadvantage:
the thermal runaway under the dormancy condition can not be pre-warned, and most failure scenes are omitted.
Disadvantage 3:
the path is complicated, the nodes are numerous, the modularization is not realized, and the disconnection caused by non-thermal runaway is inconvenient to maintain.
Disadvantage 4:
the early warning is only carried out after the thermal runaway occurs, and the early warning timeliness is poor. If the thermal runaway is not early warned, the escape and the fire extinguishing are not timely, and greater life and property safety is caused. If the early warning scheme can not realize the warning under the dormant condition, the monitoring of stopping and firing is lacked. If the early warning and detection scheme is started until thermal runaway occurs, early warning delay is caused, and reasonable time for effective control is hindered. If the solution is too complex and inconvenient to maintain, the use costs increase.
Disclosure of Invention
Therefore, a power battery thermal runaway multi-stage early warning method needs to be provided to solve the problems that the existing thermal runaway early warning method is high in acquisition cost, cannot realize an electrodeless sleep mode, cannot perform early warning in time and the like. The specific technical scheme is as follows:
a power battery thermal runaway multi-stage early warning method comprises the following steps:
a fuse is arranged in each battery module and arranged around each battery cell;
the fuses of each battery module are connected through wires to form a circuit for connecting a power supply and the ground;
collecting monitoring point voltage, wherein the monitoring point voltage is different before and after the fuse is fused;
and judging whether the voltage of the monitoring point is changed from a first preset voltage to a second preset voltage, if so, acquiring the monomer pressure difference, judging whether the monomer pressure difference is increased by a preset value, and if so, judging that the thermal runaway is caused.
Further, before "collecting the voltage of the monitoring point", the method further comprises the following steps:
when the vehicle enters a sleep mode, awakening the vehicle after a first preset time, and calculating a consistency differential pressure increase rate and a temperature difference;
and inquiring a timing correction coefficient according to the increase rate of the consistency pressure difference within a preset temperature difference range, correcting timing wake-up time according to the timing correction coefficient, judging whether the increase rate of the consistency pressure difference exceeds a thermal runaway early warning voltage, if so, triggering the thermal runaway early warning judgment, and if not, continuing to execute dormancy timing.
Further, the method also comprises the following steps:
and judging whether the timing correction coefficient is zero or not, and if so, judging that the failure risk is large.
Further, the step of "judging whether the voltage of the monitoring point is changed from a first preset voltage to a second preset voltage, if so, acquiring the monomer pressure difference" specifically further comprises the steps of: if the monitoring point voltage is in the online mode, when the voltage of the monitoring point is changed from a first preset voltage to a second preset voltage, judging whether the monitoring point voltage is in a charging mode or a driving mode, if so, stopping charging, and if so, reducing the speed of the vehicle and giving an early warning for parking;
if the monitoring point voltage is in the sleep mode, when the monitoring point voltage is changed from the first preset voltage to the second preset voltage, the BMS is awakened.
Further, the method also comprises the following steps: and sending out a thermal runaway alarm to remind a user, sending corresponding thermal runaway alarm information to the remote monitoring platform, and starting a thermal runaway processing program after the remote monitoring platform receives the corresponding information.
In order to solve the technical problem, the power battery thermal runaway multistage early warning system is further provided, and the specific technical scheme is as follows:
a power battery thermal runaway multi-stage early warning system comprises: the battery management module comprises a battery module, an electrical module and a battery management module;
the electrical module is respectively connected with the battery module and the battery management module;
the battery module comprises battery cells, and a fuse is arranged around each battery cell;
the electrical module is used for connecting the fuses of each battery module to form a circuit for connecting a power supply and the ground;
the battery management module is used for: collecting monitoring point voltage, wherein the monitoring point voltage is different before and after the fuse is fused;
and judging whether the voltage of the monitoring point is changed from a first preset voltage to a second preset voltage, if so, acquiring the monomer pressure difference, judging whether the monomer pressure difference is increased by a preset value, and if so, judging that the thermal runaway is caused.
Further, the battery management module is further configured to: before the "collecting the voltage of the monitoring point",
when the vehicle enters a sleep mode, awakening the vehicle after a first preset time, and calculating a consistency differential pressure increase rate and a temperature difference;
and inquiring a timing correction coefficient according to the increase rate of the consistency pressure difference within a preset temperature difference range, correcting timing wake-up time according to the timing correction coefficient, judging whether the increase rate of the consistency pressure difference exceeds a thermal runaway early warning voltage, if so, triggering the thermal runaway early warning judgment, and if not, continuing to execute dormancy timing.
Further, the battery management module is further configured to: and judging whether the timing correction coefficient is zero or not, and if so, judging that the failure risk is large.
Further, the battery management module is further configured to: if the monitoring point voltage is in the online mode, when the voltage of the monitoring point is changed from a first preset voltage to a second preset voltage, judging whether the monitoring point voltage is in a charging mode or a driving mode, if so, stopping charging, and if so, reducing the speed of the vehicle and giving an early warning for parking;
if the monitoring point voltage is in the sleep mode, when the monitoring point voltage is changed from the first preset voltage to the second preset voltage, the BMS is awakened.
Further, the battery management module is further configured to: and sending out a thermal runaway alarm to remind a user, and sending corresponding thermal runaway alarm information to the remote monitoring platform.
The invention has the beneficial effects that: a fuse is arranged in each battery module and arranged around each battery cell; the fuses of each battery module are connected through wires to form a circuit for connecting a power supply and the ground; collecting monitoring point voltage, wherein the monitoring point voltage is different before and after the fuse is fused; and judging whether the voltage of the monitoring point is changed from a first preset voltage to a second preset voltage, if so, further judging whether thermal runaway or fuse failure occurs, so that monomer pressure difference is collected, whether the monomer pressure difference is increased by a preset value is judged, and if so, thermal runaway is judged. Through the steps, the thermal runaway can be accurately judged, only one monitoring point is needed, and the cost is low.
Drawings
Fig. 1 is a flowchart of a multi-stage warning method for thermal runaway of a power battery according to an embodiment;
fig. 2 is a schematic diagram of an application module of a multi-stage warning method for thermal runaway of a power battery according to an embodiment;
FIG. 3 is a schematic view of a battery module according to an embodiment;
FIG. 4 is a schematic view of an electrical module according to an embodiment;
fig. 5 is a schematic block diagram of a power battery thermal runaway multi-stage early warning system according to an embodiment.
Description of reference numerals:
500. a power battery thermal runaway multi-stage early warning system,
501. a battery module is provided with a battery module,
502. an electrical module is provided with a plurality of electrical modules,
503. and a battery management module.
Detailed Description
To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1 to 4, in the present embodiment, a power battery thermal runaway multi-stage early warning method can be applied to a power battery thermal runaway multi-stage early warning system, where the power battery thermal runaway multi-stage early warning system includes: the battery management module comprises a battery module, an electrical module and a battery management module; as shown in fig. 2 to 4, a fuse is disposed in each battery module, and the fuse is disposed around each battery cell; the fuses of each battery module are connected by electric wires to form a circuit for connecting a power source and ground. The fuse is arranged around each battery cell, and high-temperature effects caused by thermal runaway of each battery cell can be monitored at the first time. When the battery core is in thermal runaway, the monomer rapidly or slowly generates heat; the rapid heating brings about rapid fire, the slow heating brings about smoking, and the fire is started after a period of time. Either of these causes a single cell temperature rise and a single voltage dip. Therefore, the cell temperature is monitored by using the fuse, and when the cell temperature reaches the melting point of the set fuse, the fuse is fused. And the electrical system enables the awakening source and the awakening voltage acquisition unit of the BMS to acquire the power supply voltage according to the change of the fuse. The electrical module connects the fuses of each module such that the collection point exhibits a voltage close to 0 before blowing and close to the supply voltage after blowing. As shown in FIGS. 2-4, before blowing, the voltage follows the following equation:
V1＝R*V0/(Rup+R)
v1: representing the voltage of the wake-up source interface, namely the voltage of a monitoring point; r is a fuse series resistor; rup is a power supply pull-up protection resistor; v0 is the supply voltage;
after fusing, the voltage conforms to the formula: v1 ═ V0.
The method comprises the following specific steps:
step S101: be provided with the fuse in every battery module, the fuse sets up around each electricity core.
Step S102: the fuses of each battery module are connected by electric wires to form a circuit for connecting a power source and ground.
Step S103: and collecting the voltage of a monitoring point, wherein the voltage of the monitoring point is different before and after the fuse is fused.
Step S104: is the monitor point voltage changed from a first preset voltage to a second preset voltage?
Step S105: the monomer pressure difference was collected.
Step S106: is the monomer pressure differential increased by a predetermined value?
Step S107: thermal runaway is judged.
The above steps can be subdivided into two modes, one is online mode thermal runaway diagnosis, and the other is sleep mode thermal runaway diagnosis, which are described below:
and (3) online mode:
in this embodiment, the first preset voltage is zero, the second preset voltage is a power voltage, if the mode is the online mode, when the voltage of the monitoring point is changed from the first preset voltage to the second preset voltage, the BMS enters a thermal runaway diagnosis to determine whether the monitoring point is in the charging mode or the driving mode, if the monitoring point is in the charging mode, the charging is stopped, and if the monitoring point is in the driving mode, the vehicle speed is reduced and the vehicle is stopped with an early warning.
A sleep mode: when the voltage of the monitoring point is changed from a first preset voltage to a second preset voltage, triggering a wake-up signal line to be equal to the voltage of a power supply; waking up the BMS as the wake-up voltage is changed from 0 to the power supply voltage; diagnosing wake-up source voltage after the BMS wakes up; the awakening source voltage is larger than a set value (because awakening has a plurality of awakening modes, the awakening source voltage is diagnosed to determine that the awakening source voltage is caused by voltage change of a detection point, but not by other normal awakening such as CAN awakening), the fuse is judged to be fused, and the single body voltage difference is further diagnosed. The mode covers the sleep mode, and all-weather 24h uninterrupted monitoring is achieved.
In practical applications, when V1 is equal to V0 due to some hardware problem, it is easy to misdiagnose thermal runaway. Such as: disconnection caused by fuse vibration, disconnection caused by plug-in looseness, acquisition error caused by acquisition fault of BMS hardware and the like. In order to avoid the situation and accurately diagnose that the fusing is caused by thermal runaway, a voltage difference diagnosis scheme is added for avoiding. As shown in step S105 and step S106.
And when the vehicle is in an online mode, judging whether the monomer pressure difference is increased by a preset value compared with that when the vehicle is started, and if the preset value is increased, judging that the vehicle is out of control thermally. Otherwise, determining the fuse fault.
The fuse fault notification remote monitoring background carries out vehicle maintenance, the monomer pressure difference is monitored in real time in the maintenance waiting process (a driving mode starts a limp home mode, a charging mode stops charging), if the monomer pressure difference is increased by a preset value compared with the static pressure difference before parking and sleeping, thermal runaway is judged, and if not, after-sale treatment is continuously waited;
and when the thermal runaway fault is diagnosed, a thermal runaway alarm is sent to remind a user, corresponding thermal runaway alarm information is sent to the remote monitoring platform, and after the remote monitoring platform receives the corresponding information, a thermal runaway processing program is started.
Similarly, in the sleep mode, whether it is determined that thermal runaway or fuse failure occurs, the processing is the same as in the online mode.
Further, in this embodiment, an automatic warning scheme for the thermal runaway precursor is further set, which specifically includes:
before "gather monitoring point voltage", still include the step:
when the vehicle enters a sleep mode, awakening the vehicle after a first preset time, and calculating a consistency differential pressure increase rate and a temperature difference;
and inquiring a timing correction coefficient according to the increase rate of the consistency pressure difference within a preset temperature difference range, correcting timing wake-up time according to the timing correction coefficient, judging whether the increase rate of the consistency pressure difference exceeds a thermal runaway early warning voltage, if so, triggering the thermal runaway early warning judgment, and if not, continuing to execute dormancy timing. The following detailed description:
after the normal vehicle runs, the vehicle enters the sleep mode, the timing wake-up time is marked as T0, and a monomer voltage array Volt1[ n ] and the temperature Temp1[ m ] are marked;
after T0 time, self-awakening, marking a monomer voltage array Volt2[ n ] and a temperature Temp2[ m ], respectively making difference values with Volt1[ n ] and Temp1[ m ] to obtain delta Volt [ n ] and delta Temp [ m ], making difference on the maximum value and the minimum value of delta Volt [ n ] and delta Temp [ m ] to obtain CellVDiff and CellTDiff, and obtaining a coefficient y by looking up the following table: store the new T0 and Volt1[ n ], Temp1[ m ] as: t0, Volt2[ n ], Temp2[ m ].
Further, the method also comprises the following steps:
and judging whether the timing correction coefficient is zero or not, and if the timing correction coefficient is zero, judging that the failure risk is large (the correction coefficient is a characteristic definition parameter, the coefficient size corresponds to a designed table, a correction coefficient 0 is defined in the table, the corresponding consistency differential pressure change rate is extremely large, and a set risk value is reached). If not, repeating the step of calculating the increase rate of the consistent differential pressure and the temperature difference; and inquiring a timing correction coefficient according to the increase rate of the consistent pressure difference within a preset temperature difference range, correcting timing wake-up time according to the timing correction coefficient, judging whether the increase rate of the consistent pressure difference exceeds a thermal runaway early warning voltage, if so, triggering the thermal runaway early warning judgment, and if not, continuing to execute dormancy timing.
A fuse is arranged in each battery module and arranged around each battery cell; the fuses of each battery module are connected through wires to form a circuit for connecting a power supply and the ground; collecting monitoring point voltage, wherein the monitoring point voltage is different before and after the fuse is fused; and judging whether the voltage of the monitoring point is changed from a first preset voltage to a second preset voltage, if so, further judging whether thermal runaway or fuse failure occurs, so that monomer pressure difference is collected, whether the monomer pressure difference is increased by a preset value is judged, and if so, thermal runaway is judged. Through the steps, the thermal runaway can be accurately judged, only one monitoring point is needed, and the cost is low. Any one electric core of the battery pack can be monitored and rectified, and the area coverage is strong.
And the automatic early warning function of the thermal runaway precursor is arranged, so that when the thermal runaway does not occur, the early warning and monitoring period of the thermal runaway can be automatically calculated, and the loss is reduced. And the pressure difference change rate and the timing correction period adjustment coefficient are designed, and the rationality calibration can be carried out according to different types of battery cores and battery pack schemes, so that the coverage range is large, and the scheme is flexible.
Referring to fig. 2 to fig. 5, in the present embodiment, an embodiment of a power battery thermal runaway multi-stage warning system 500 is as follows:
a multi-stage early warning system 500 for thermal runaway of a power battery comprises: a battery module 501, an electrical module 502, and a battery management module 503;
the electrical module 502 is respectively connected with the battery module 501 and the battery management module 503;
the battery module 501 comprises battery cells, and fuses are arranged around each battery cell;
the electrical module 502 is used for connecting the fuses of each battery module 501 to form a circuit for connecting a power supply and the ground;
the battery management module 503 is configured to: collecting monitoring point voltage, wherein the monitoring point voltage is different before and after the fuse is fused;
and judging whether the voltage of the monitoring point is changed from a first preset voltage to a second preset voltage, if so, acquiring the monomer pressure difference, judging whether the monomer pressure difference is increased by a preset value, and if so, judging that the thermal runaway is caused.
The above can be subdivided into two modes, one is online mode thermal runaway diagnosis, and the other is sleep mode thermal runaway diagnosis, which are described below:
and (3) online mode:
in this embodiment, the first preset voltage is zero, the second preset voltage is a power voltage, if the mode is the online mode, when the voltage of the monitoring point is changed from the first preset voltage to the second preset voltage, the BMS enters a thermal runaway diagnosis to determine whether the monitoring point is in the charging mode or the driving mode, if the monitoring point is in the charging mode, the charging is stopped, and if the monitoring point is in the driving mode, the vehicle speed is reduced and the vehicle is stopped with an early warning.
A sleep mode: when the voltage of the monitoring point is changed from a first preset voltage to a second preset voltage, triggering a wake-up signal line to be equal to the voltage of a power supply; waking up the BMS as the wake-up voltage is changed from 0 to the power supply voltage; diagnosing wake-up source voltage after the BMS wakes up; and when the awakening source voltage is larger than a set value, judging that the fuse is fused, and further diagnosing the monomer pressure difference. The mode covers the sleep mode, and all-weather 24h uninterrupted monitoring is achieved.
In practical applications, when V1 is equal to V0 due to some hardware problem, it is easy to misdiagnose thermal runaway. Such as: disconnection caused by fuse vibration, disconnection caused by plug-in looseness, acquisition error caused by acquisition fault of BMS hardware and the like. In order to avoid the situation and accurately diagnose that the fusing is caused by thermal runaway, a voltage difference diagnosis scheme is added for avoiding. As shown in step S105 and step S106.
And when the vehicle is in an online mode, judging whether the monomer pressure difference is increased by a preset value compared with that when the vehicle is started, and if the preset value is increased, judging that the vehicle is out of control thermally. Otherwise, determining the fuse fault.
The fuse fault notification remote monitoring background carries out vehicle maintenance, the monomer pressure difference is monitored in real time in the maintenance waiting process (a driving mode starts a limp home mode, a charging mode stops charging), if the monomer pressure difference is increased by a preset value compared with the static pressure difference before parking and sleeping, thermal runaway is judged, and if not, after-sale treatment is continuously waited;
and when the thermal runaway fault is diagnosed, a thermal runaway alarm is sent to remind a user, corresponding thermal runaway alarm information is sent to the remote monitoring platform, and after the remote monitoring platform receives the corresponding information, a thermal runaway processing program is started.
Similarly, in the sleep mode, whether it is determined that thermal runaway or fuse failure occurs, the processing is the same as in the online mode.
Further, in this embodiment, an automatic warning scheme for the thermal runaway precursor is further set, which specifically includes: the battery management module 503 is further configured to: before the "collecting the voltage of the monitoring point",
when the vehicle enters a sleep mode, awakening the vehicle after a first preset time, and calculating a consistency differential pressure increase rate and a temperature difference;
and inquiring a timing correction coefficient according to the increase rate of the consistency pressure difference within a preset temperature difference range, correcting timing wake-up time according to the timing correction coefficient, judging whether the increase rate of the consistency pressure difference exceeds a thermal runaway early warning voltage, if so, triggering the thermal runaway early warning judgment, and if not, continuing to execute dormancy timing. The following detailed description:
after the normal vehicle runs, the vehicle enters the sleep mode, the timing wake-up time is marked as T0, and a monomer voltage array Volt1[ n ] and the temperature Temp1[ m ] are marked;
after T0 time, self-awakening, marking a monomer voltage array Volt2[ n ] and a temperature Temp2[ m ], respectively making difference values with Volt1[ n ] and Temp1[ m ] to obtain delta Volt [ n ] and delta Temp [ m ], making difference on the maximum value and the minimum value of delta Volt [ n ] and delta Temp [ m ] to obtain CellVDiff and CellTDiff, and obtaining a coefficient y by looking up the following table: store the new T0 and Volt1[ n ], Temp1[ m ] as: t0, Volt2[ n ], Temp2[ m ].
Further, the battery management module 503 is further configured to: and judging whether the timing correction coefficient is zero or not, and if so, judging that the failure risk is large. If not, repeating the step of calculating the increase rate of the consistent differential pressure and the temperature difference; and inquiring a timing correction coefficient according to the increase rate of the consistent pressure difference within a preset temperature difference range, correcting timing wake-up time according to the timing correction coefficient, judging whether the increase rate of the consistent pressure difference exceeds a thermal runaway early warning voltage, if so, triggering the thermal runaway early warning judgment, and if not, continuing to execute dormancy timing.
A fuse is arranged in each battery module 501, and the fuse is arranged around each battery core; the fuses of each battery module 501 are connected by wires to form a circuit for connecting a power supply and ground; collecting monitoring point voltage, wherein the monitoring point voltage is different before and after the fuse is fused; and judging whether the voltage of the monitoring point is changed from a first preset voltage to a second preset voltage, if so, further judging whether thermal runaway or fuse failure occurs, so that monomer pressure difference is collected, whether the monomer pressure difference is increased by a preset value is judged, and if so, thermal runaway is judged. Through the steps, the thermal runaway can be accurately judged, only one monitoring point is needed, and the cost is low. Any one electric core of the battery pack can be monitored and rectified, and the area coverage is strong.
And the automatic early warning function of the thermal runaway precursor is arranged, so that when the thermal runaway does not occur, the early warning and monitoring period of the thermal runaway can be automatically calculated, and the loss is reduced. And the pressure difference change rate and the timing correction period adjustment coefficient are designed, and the rationality calibration can be carried out according to different types of battery cores and battery pack schemes, so that the coverage range is large, and the scheme is flexible.
It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein, or by using equivalent structures or equivalent processes performed in the content of the present specification and the attached drawings, which are included in the scope of the present invention.
Claims (10)
1. A power battery thermal runaway multi-stage early warning method is characterized by comprising the following steps:
a fuse is arranged in each battery module and arranged around each battery cell;
the fuses of each battery module are connected through wires to form a circuit for connecting a power supply and the ground;
collecting monitoring point voltage, wherein the monitoring point voltage is different before and after the fuse is fused;
and judging whether the voltage of the monitoring point is changed from a first preset voltage to a second preset voltage, if so, acquiring the monomer pressure difference, judging whether the monomer pressure difference is increased by a preset value, and if so, judging that the thermal runaway is caused.
2. The power battery thermal runaway multi-stage early warning method according to claim 1, wherein before the step of collecting the voltage of the monitoring point, the method further comprises the steps of:
when the vehicle enters a sleep mode, awakening the vehicle after a first preset time, and calculating a consistency differential pressure increase rate and a temperature difference;
and inquiring a timing correction coefficient according to the increase rate of the consistency pressure difference within a preset temperature difference range, correcting timing wake-up time according to the timing correction coefficient, judging whether the increase rate of the consistency pressure difference exceeds a thermal runaway early warning voltage, if so, triggering the thermal runaway early warning judgment, and if not, continuing to execute dormancy timing.
3. The power battery thermal runaway multi-stage early warning method according to claim 2, further comprising the steps of:
and judging whether the timing correction coefficient is zero or not, and if so, judging that the failure risk is large.
4. The multi-stage warning method for thermal runaway of power battery as claimed in claim 1,
"judge whether monitoring point voltage is by first preset voltage to second preset voltage, if, gather monomer pressure differential", still include the step specifically: if the monitoring point voltage is in the online mode, when the voltage of the monitoring point is changed from a first preset voltage to a second preset voltage, judging whether the monitoring point voltage is in a charging mode or a driving mode, if so, stopping charging, and if so, reducing the speed of the vehicle and giving an early warning for parking;
if the monitoring point voltage is in the sleep mode, when the monitoring point voltage is changed from the first preset voltage to the second preset voltage, the BMS is awakened.
5. The power battery thermal runaway multi-stage early warning method according to claim 1, further comprising the steps of: and sending out a thermal runaway alarm to remind a user, sending corresponding thermal runaway alarm information to the remote monitoring platform, and starting a thermal runaway processing program after the remote monitoring platform receives the corresponding information.
6. The utility model provides a multistage early warning system of power battery thermal runaway which characterized in that includes: the battery management module comprises a battery module, an electrical module and a battery management module;
the electrical module is respectively connected with the battery module and the battery management module;
the battery module comprises battery cells, and a fuse is arranged around each battery cell;
the electrical module is used for connecting the fuses of each battery module to form a circuit for connecting a power supply and the ground;
the battery management module is used for: collecting monitoring point voltage, wherein the monitoring point voltage is different before and after the fuse is fused;
and judging whether the voltage of the monitoring point is changed from a first preset voltage to a second preset voltage, if so, acquiring the monomer pressure difference, judging whether the monomer pressure difference is increased by a preset value, and if so, judging that the thermal runaway is caused.
7. The multi-stage warning system for thermal runaway of power battery as claimed in claim 6,
the battery management module is further configured to: before the "collecting the voltage of the monitoring point",
when the vehicle enters a sleep mode, awakening the vehicle after a first preset time, and calculating a consistency differential pressure increase rate and a temperature difference;
and inquiring a timing correction coefficient according to the increase rate of the consistency pressure difference within a preset temperature difference range, correcting timing wake-up time according to the timing correction coefficient, judging whether the increase rate of the consistency pressure difference exceeds a thermal runaway early warning voltage, if so, triggering the thermal runaway early warning judgment, and if not, continuing to execute dormancy timing.
8. The multi-stage warning system for thermal runaway of power battery according to claim 6, wherein the battery management module is further configured to: and judging whether the timing correction coefficient is zero or not, and if so, judging that the failure risk is large.
9. The multi-stage warning system for thermal runaway of power battery according to claim 6, wherein the battery management module is further configured to: if the monitoring point voltage is in the online mode, when the voltage of the monitoring point is changed from a first preset voltage to a second preset voltage, judging whether the monitoring point voltage is in a charging mode or a driving mode, if so, stopping charging, and if so, reducing the speed of the vehicle and giving an early warning for parking;
if the monitoring point voltage is in the sleep mode, when the monitoring point voltage is changed from the first preset voltage to the second preset voltage, the BMS is awakened.
10. The multi-stage warning system for thermal runaway of power battery according to claim 6, wherein the battery management module is further configured to: and sending out a thermal runaway alarm to remind a user, and sending corresponding thermal runaway alarm information to the remote monitoring platform.
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| CN115550409A (en) * | 2022-11-29 | 2022-12-30 | 深圳海润新能源科技有限公司 | Method for remotely solving thermal runaway and related product |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111370784A (en) * | 2020-02-21 | 2020-07-03 | 清华大学 | Battery thermal runaway early warning method |
| CN111907329A (en) * | 2020-06-29 | 2020-11-10 | 东风汽车集团有限公司 | Monitoring system and monitoring method capable of carrying out power battery full-time thermal runaway early warning |
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| CN111370784A (en) * | 2020-02-21 | 2020-07-03 | 清华大学 | Battery thermal runaway early warning method |
| CN111907329A (en) * | 2020-06-29 | 2020-11-10 | 东风汽车集团有限公司 | Monitoring system and monitoring method capable of carrying out power battery full-time thermal runaway early warning |
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|---|---|---|---|---|
| CN115550409A (en) * | 2022-11-29 | 2022-12-30 | 深圳海润新能源科技有限公司 | Method for remotely solving thermal runaway and related product |
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