CN111907329B - Monitoring system and monitoring method capable of carrying out power battery full-time thermal runaway early warning - Google Patents
Monitoring system and monitoring method capable of carrying out power battery full-time thermal runaway early warning Download PDFInfo
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- CN111907329B CN111907329B CN202010610848.1A CN202010610848A CN111907329B CN 111907329 B CN111907329 B CN 111907329B CN 202010610848 A CN202010610848 A CN 202010610848A CN 111907329 B CN111907329 B CN 111907329B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
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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
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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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
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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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
- H01M2010/4278—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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Power Engineering (AREA)
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Abstract
The invention relates to the technical field of vehicle thermal runaway monitoring, in particular to a monitoring system and a monitoring method capable of performing full-time thermal runaway early warning on a power battery. The early warning device comprises a detection unit, a wake-up circuit, a controller and an early warning unit. The wake-up circuit comprises a NAND gate circuit and a fusing circuit, the input end of the NAND gate circuit is connected with the signal output end of the wake-up source and the signal output end of the fusing circuit, the fusing circuit is arranged on a flexible circuit board in the energy storage battery pack, and the input end of the fusing circuit is connected with a wake-up signal source. Adopt the fusing circuit cooperation that sets up on the flexible circuit board in the energy storage group battery and not gate circuit to realize the awakening control of controller, when the high temperature in arbitrary group battery, homoenergetic fusing circuit realizes awakening up signal output to awaken up the controller and carry out thermal runaway detection, control and early warning.
Description
Technical Field
The invention relates to the technical field of vehicle thermal runaway monitoring, in particular to a monitoring system and a monitoring method capable of performing full-time thermal runaway early warning on a power battery.
Background
With the large-scale application of electric automobiles, the electric automobiles attract extensive attention in the event of fire. In the current thermal runaway passive detection and early warning scheme, most of the battery voltage, the battery current, the temperature, the gas, the pressure and other parameters in a battery pack are monitored through a controller, so that whether a thermal runaway event occurs or not is judged and early warning is given, and the controller is required to be in a working state. There is a significant problem in this type of method, that is, when the controller is in a sleep state, such as a state where the electric vehicle is parked and powered off, the above parameters cannot be monitored to give an early warning.
Disclosure of Invention
The invention aims to provide a monitoring system and a monitoring method capable of performing full-time thermal runaway early warning on a power battery, aiming at the defects of the prior art, so that thermal runaway detection and early warning can be timely and accurately performed when a thermal runaway event occurs no matter a controller is in a working state or a dormant state.
The invention discloses a monitoring system capable of carrying out full-time thermal runaway early warning on a power battery, which adopts the technical scheme that: the early warning device comprises a detection unit, a wake-up circuit, a controller and an early warning unit, wherein the detection signal output end of the detection unit is connected with the detection signal input end of the controller, the wake-up signal output end of the wake-up circuit is connected with the wake-up signal input end of the controller, the controller is used for sending an early warning instruction to the early warning unit when the detection signal meets a set early warning condition, and the early warning unit is used for executing the early warning instruction; the awakening circuit comprises an NAND gate circuit and a fusing circuit, the input end of the NAND gate circuit is connected with the signal output end of the awakening source and the signal output end of the fusing circuit, the fusing circuit is arranged on a flexible circuit board in the energy storage battery pack, and the input end of the fusing circuit is connected with the awakening signal source.
Preferably, the fuse circuit comprises a plurality of fuse wires, the fuse wires are connected in any one of series connection, parallel connection and series-parallel connection to form the fuse circuit, and the fuse wires are arranged on the flexible circuit board in the energy storage battery pack in a snake-shaped wiring manner.
Preferably, when the fuses are connected in series, the fuse circuit has only one output; when the fuses are connected in parallel, the fuse circuit has n paths of outputs, wherein n is the number of the fuses; when the fuse wires are connected in series-parallel connection mode, the fuse circuit has m paths of output, and m is the number of parallel paths of the fuse wires.
Preferably, the detection unit comprises a pressure sensor, a temperature sensor and a gas sensor, the pressure sensor is used for detecting the pressure in the battery pack, the temperature sensor is used for detecting the temperature in the battery pack, and the gas sensor is used for detecting the concentration of gas in the battery pack.
Preferably, the gas sensor and the pressure sensor are uniformly distributed on the inner side of the explosion-proof valve of the upper cover of the battery.
Preferably, the battery box further comprises a one-way solenoid valve, the one-way solenoid valve is arranged at the bottom of the battery box, and the controller controls the one-way solenoid valve to be opened when the detection signal meets the set early warning condition.
Preferably, the controller is arranged above the battery module, and a heat insulation plate is arranged between the controller and the battery module.
The invention relates to a monitoring method of a monitoring system capable of carrying out full-time thermal runaway early warning on a power battery, which adopts the technical scheme that: and the wake-up controller monitors the pressure, the temperature and the gas concentration in the battery pack, and controls the one-way solenoid valve of the battery box body to open and perform early warning when the pressure, the temperature and the gas concentration in the battery pack meet any one or more of fault early warning triggering conditions.
Preferably, the fault pre-warning triggering condition comprises
The voltage of the single battery is smaller than a set voltage threshold, the duration reaches a set first time threshold, meanwhile, the highest temperature of the single battery is larger than a set temperature threshold, and the duration reaches a set second time threshold;
the voltage of the single battery is smaller than a set voltage threshold, the duration reaches a set first time threshold, the temperature change rate of the single battery is larger than a set temperature change rate, and the duration reaches a set second time threshold;
the voltage of the single battery is smaller than a set voltage threshold, the duration reaches a set first time threshold, meanwhile, the temperature difference of the single battery is larger than a set temperature difference threshold, and the duration reaches a set second time threshold;
the maximum temperature of the single battery is greater than a set temperature threshold, the duration reaches a set second time threshold, and meanwhile, the number of voltage sampling open circuit faults is not less than 1;
the voltage of the single battery is less than a set voltage threshold, the duration reaches a set first time threshold, and meanwhile, the number of voltage sampling open circuit faults is not less than 1;
the temperature difference of the single battery is greater than a set temperature difference threshold, the duration reaches a set second time threshold, and meanwhile, the number of voltage sampling open circuit faults is not less than 1;
the failure number of the temperature sensor is not less than 2, and the voltage sampling open circuit fault number is not less than 1;
the communication fails, the pressure exceeds a set pressure threshold value, and the duration time reaches a set third time threshold value;
the communication is failed, the gas concentration exceeds a set concentration threshold, and the duration reaches a set fourth time threshold;
the communication fails, and the duration of the pressure fluctuation reaches a set fifth time threshold;
the communication fails and the duration of the gas concentration fluctuation reaches the set sixth time threshold.
The invention has the beneficial effects that: adopt the fusing circuit cooperation that sets up on the flexible circuit board in the energy storage group battery and not gate circuit to realize the awakening control of controller, when the high temperature in arbitrary group battery, homoenergetic fusing circuit realizes awakening up signal output to awaken up the controller and carry out thermal runaway detection, control and early warning. Even if the controller is in a dormant state, the controller can still be triggered to carry out thermal runaway detection. Meanwhile, the controller is only awakened under the condition that the fusing circuit is fused, so that the controller is prevented from being continuously in a working state, and energy waste is avoided. The fusing circuit is composed of fusing wires arranged in a snake-shaped wiring mode, can accumulate heat energy more quickly to cause fusing, and has higher reliability. The gas, temperature and pressure signals are used as monitoring objects together, and early warning is carried out when any fault early warning triggering condition is met, so that the monitoring data is more comprehensive, and the reliability of thermal runaway detection is further improved. Meanwhile, when thermal runaway is judged, hot gas in the battery box body is discharged through the one-way electromagnetic valve, high-temperature gas can be discharged in time, and damage to devices in the battery box body is prevented.
Drawings
FIG. 1 is a schematic diagram of module connections of a monitoring system capable of performing a warning of thermal runaway of a power battery at all times according to the present invention;
FIG. 2 is a schematic diagram of the connection of the wake-up circuit;
FIG. 3 is a schematic diagram of the connection of a fuse circuit formed by connecting fuse wires in series with a NAND gate;
FIG. 4 is a schematic diagram of the connection of a fuse circuit formed by connecting fuse wires in parallel with a NAND gate;
FIG. 5 is a schematic diagram of the connection between the fuse circuit formed by the parallel-serial connection of the fuse wires and the NAND gate;
FIG. 6 is a schematic diagram of a fuse serpentine trace;
FIG. 7 is a schematic view of a gas sensor and pressure sensor arrangement;
FIG. 8 is a schematic view of a one-way solenoid valve arrangement;
FIG. 9 is a schematic diagram of a first example arrangement of the controller;
FIG. 10 is a schematic view showing a second example of the arrangement of the controller;
FIG. 11 is a schematic flow chart of a monitoring method of a monitoring system capable of performing a warning of thermal runaway of a power battery over a period of time;
FIG. 12 is a graph illustrating typical cell voltage versus time during thermal runaway;
FIG. 13 is a graph illustrating typical cell temperature versus time for thermal runaway;
fig. 14 is a graph illustrating a typical cell temperature change rate with time during thermal runaway.
In the figure: 1-flexible circuit board, 2-fuse, 3-module sampling connector, 4-explosion-proof valve, 5-one-way solenoid valve, 6-controller, 7-thermal baffle and 8-battery module
Detailed Description
The invention will be further described in detail with reference to the following drawings and specific examples, which are not intended to limit the invention, but are for clear understanding.
As shown in figure 1, the monitoring system capable of performing the power battery full-time thermal runaway early warning comprises a detection unit, a wake-up circuit, a controller 6, a single-item electromagnetic valve 5 and an early warning unit, wherein a detection signal output end of the detection unit is connected with a detection signal input end of the controller 6, a wake-up signal output end of the wake-up circuit is connected with a wake-up signal input end of the controller 6, the controller 6 is used for sending an early warning instruction to the early warning unit when a detection signal meets a set early warning condition, and the early warning unit is used for implementing early warning actions when receiving the early warning instruction.
As shown in FIG. 2, the wake-up circuit includes a NAND gate and a fuse, the input of the NAND gate being connected to the signal output of the wake-up source and the signal output of the fuse. The fusing circuit is arranged on the flexible circuit board 1 in the energy storage battery pack, and the input end of the fusing circuit is connected with the awakening signal source.
As shown in fig. 6, the fuse circuit includes a plurality of fuses 2, the plurality of fuses 2 are connected in any one of series connection, parallel connection and series-parallel connection to form the fuse circuit, and the fuses 2 are disposed on the flexible circuit board 1 in the IP8S energy storage battery pack in a snake-shaped wiring manner. The input end of the fuse wire 2 is connected with a wake-up signal source which can be a 12V power supply of a storage battery. The output of the fuse 2 is output through a sampling connector 4.
As shown in fig. 3 to 5, when the fuses are connected in series, the fuse circuit has only one output; when the fuses are connected in parallel, the fuse circuit has n outputs, n being the number of fuses (F1-Fn); when the fuse wires are connected in series-parallel connection, the fuse circuit has m paths of output, and m is the number of parallel paths of the fuse wires. When the temperature in any module reaches a temperature threshold value, the output level of the NAND gate circuit can be triggered to jump, and the controller 6 is awakened.
Take the example of an OC gate nand gate and set the controller 6 to wake up high. When the temperature of the module is lower than a temperature threshold value, the input of the wake-up circuit is in a normal state, all circuits of the NAND gate circuit input high level, the NAND gate circuit outputs low level, and the wake-up circuit outputs low level; when the fuse 2 on any module is fused because the temperature exceeds the temperature threshold, one input of the NAND gate circuit is low level, the NAND gate circuit outputs high level, the output level of the wake-up circuit jumps from low level to high level, and the controller wakes up.
As shown in fig. 7, since most of the reducing gas has a small molecular weight, the gas sensor and the pressure sensor are disposed inside the battery upper cover explosion-proof valve 4. The number and positions of the pressure sensors and the gas sensors can be adjusted according to the system requirements, and the embodiment is only one application.
As shown in fig. 8, in order to avoid the risk of thermal runaway caused by leakage of the coolant and the rapid release of gas pressure under the thermal runaway condition, the one-way solenoid valve 5 of this embodiment is disposed at the bottom (or the lowest point) of the lower battery box, the opening direction of the one-way solenoid valve 5 should face the outside of the passenger compartment, and the coolant and the gas can be discharged when the one-way solenoid valve 5 is opened. The number and the arrangement position of the one-way solenoid valves 5 can be adjusted according to the system requirements, and the embodiment is only one application.
As shown in fig. 9, for the controller 6 arranged above the module 8, a heat insulation plate 7 is designed below the controller 6, the mica plate is adopted in the embodiment, the thickness of the mica plate is 2mm, and the controller can be ensured to normally work for a period of time when the battery cell below the controller is in thermal runaway, so that a thermal runaway signal is smoothly sent out; as shown in fig. 10, the controller 6 may also be disposed at the cavity or at a place where the thermal runaway high-temperature gas of the battery cell is not directly damaged, and the electromagnetic valve 5 is disposed at the bottom of the battery case, so as to facilitate the outflow of the leakage liquid.
As shown in fig. 11, a monitoring method of a monitoring system capable of performing a power battery full-time thermal runaway early warning includes:
the controller is awakened, when the temperature of one or more battery modules exceeds the fusing temperature of the fuse wire, the fuse wire (namely the snake-shaped flexible wire) is fused, the input circuit of the NAND gate circuit has low-level input, the output of the NAND gate circuit jumps to high level, the controller receives an awakening signal, the controller finishes dormancy, and starts thermal runaway detection;
pressure, temperature and gas concentration signals in the battery pack are collected through the pressure sensor, the temperature sensor and the gas sensor, and when the pressure, the temperature and the gas concentration in the battery pack meet any one or more of fault early warning triggering conditions, the controller controls the one-way solenoid valve of the battery box body to be opened and early warning is carried out.
Wherein the fault pre-warning triggering condition comprises
The voltage of the single battery is smaller than a set voltage threshold, the duration reaches a set first time threshold, meanwhile, the highest temperature of the single battery is larger than a set temperature threshold, and the duration reaches a set second time threshold;
the voltage of the single battery is smaller than a set voltage threshold, the duration reaches a set first time threshold, the temperature change rate of the single battery is larger than a set temperature change rate, and the duration reaches a set second time threshold;
the voltage of the single battery is smaller than a set voltage threshold, the duration reaches a set first time threshold, meanwhile, the temperature difference of the single battery is larger than a set temperature difference threshold, and the duration reaches a set second time threshold;
the maximum temperature of the single battery is greater than a set temperature threshold, the duration reaches a set second time threshold, and meanwhile, the number of voltage sampling open circuit faults is not less than 1;
the voltage of the single battery is less than a set voltage threshold, the duration reaches a set first time threshold, and meanwhile, the number of voltage sampling open circuit faults is not less than 1;
the temperature difference of the single battery is greater than a set temperature difference threshold, the duration reaches a set second time threshold, and meanwhile, the number of voltage sampling open circuit faults is not less than 1;
the failure number of the temperature sensor is not less than 2, and the voltage sampling open circuit fault number is not less than 1;
the communication fails, the pressure exceeds a set pressure threshold value, and the duration time reaches a set third time threshold value;
the communication is failed, the gas concentration exceeds a set concentration threshold, and the duration reaches a set fourth time threshold;
the communication fails, and the duration of the pressure fluctuation reaches a set fifth time threshold;
the communication fails and the duration of the gas concentration fluctuation reaches the set sixth time threshold.
Example one
The fault pre-warning triggering conditions are shown in the following table:
| serial number | Early warning condition combination for fault of out-of- |
| 1 | Monomer voltage < 2.1V (500ms)&Monomer maximum temperature > 68 ℃ (2s) |
| 2 | Monomer voltage < 2.1V (500ms)&The variation speed of the monomer temperature is more than 2 ℃/0.6s (2s) |
| 3 | Monomer voltage < 2.1V (500ms)&Monomer temperature difference is more than 30 ℃ (2s) |
| 4 | Monomer maximum temperature > 68 ℃ (2s)&The number of voltage sampling open circuit faults is more than or equal to 1 |
| 5 | Monomer voltage < 2.1V (500ms)&The number of voltage sampling open circuit faults is more than or equal to 1 |
| 6 | The temperature difference of the monomers is more than 30 DEG C(2s)&The number of voltage sampling open circuit faults is more than or equal to 1 |
| 7 | The failure number of the temperature sensors is more than or equal to 2&The number of voltage sampling open circuit faults is more than or equal to 1 |
| 8 | Communication failure&The pressure exceeds a threshold value and lasts for a period of time |
| 9 | Communication failure&The gas concentration exceeds the threshold value for a period of |
| 10 | Communication failure&Pressure fluctuation and duration |
| 11 | Communication failure&The gas concentration fluctuates and lasts for a period of time |
The maximum temperature 68 ℃, the temperature difference, the cell voltage, and the like in the table are adjusted according to the example, and each threshold selected in this embodiment is selected according to the curves of the cell voltage, the cell temperature, and the change rate of the cell temperature with time, as shown in fig. 12, 13, and 14. If the temperature of the thermal runaway point is selected to be 68 ℃ for 2s, multiple tests show that the probability of thermal runaway is high after the temperature is higher than 68 ℃ for 2s, and meanwhile, the thermal runaway detection accuracy can be improved to nearly 100% in order to prevent false alarm and superposition of monomer voltage jump signals.
The early warning unit in this embodiment can be vehicle control unit, and the controller sends early warning signal to vehicle control unit promptly, triggers the warning light signal that personnel can see in the car through vehicle control unit to there is continuous sound warning signal, reminds personnel in the car and near personnel outside the car to evacuate promptly, in addition, through car networking system suggestion car owner and fire department.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (8)
1. The utility model provides a monitoring system that can carry out power battery full time period thermal runaway early warning which characterized in that: the early warning device comprises a detection unit, a wake-up circuit, a controller and an early warning unit, wherein the detection signal output end of the detection unit is connected with the detection signal input end of the controller, the wake-up signal output end of the wake-up circuit is connected with the wake-up signal input end of the controller, the controller is used for sending an early warning instruction to the early warning unit when the detection signal meets a set early warning condition, and the early warning unit is used for executing the early warning instruction; the wake-up circuit comprises a NAND gate circuit and a fusing circuit, wherein the input end of the NAND gate circuit is connected with the signal output end of a wake-up source and the signal output end of the fusing circuit, the fusing circuit is a high-temperature fusing circuit, and the input end of the fusing circuit is connected with a wake-up signal source;
the fusing circuit is arranged on a flexible circuit board in the energy storage battery pack;
the fusing circuit comprises a plurality of fusing wires which are connected in any one of series connection, parallel connection and series-parallel connection to form the fusing circuit, and the fusing wires are arranged on a flexible circuit board in the energy storage battery pack in a snake-shaped wiring mode.
2. The monitoring system capable of performing power battery full-time thermal runaway warning as claimed in claim 1, wherein: when the fuses are connected in series, the fuse circuit has only one output; when the fuses are connected in parallel, the fuse circuit has n paths of outputs, wherein n is the number of the fuses; when the fuse wires are connected in series-parallel connection mode, the fuse circuit has m paths of output, and m is the number of parallel paths of the fuse wires.
3. The monitoring system capable of performing power battery full-time thermal runaway warning as claimed in claim 1, wherein: the detection unit comprises a pressure sensor, a temperature sensor and a gas sensor, wherein the pressure sensor is used for detecting the pressure in the battery pack, the temperature sensor is used for detecting the temperature in the battery pack, and the gas sensor is used for detecting the concentration of gas in the battery pack.
4. The monitoring system capable of performing power battery full-time thermal runaway warning as claimed in claim 3, wherein: and the gas sensor and the pressure sensor are uniformly distributed on the inner side of the explosion-proof valve of the upper cover of the battery.
5. The monitoring system capable of performing power battery full-time thermal runaway warning as claimed in claim 1, wherein: the battery box body is characterized by further comprising a one-way electromagnetic valve, the one-way electromagnetic valve is arranged at the bottom of the battery box body, and the controller controls the one-way electromagnetic valve to be opened when the detection signal meets the set early warning condition.
6. The monitoring system capable of performing power battery full-time thermal runaway warning as claimed in claim 1, wherein: the controller is arranged above the battery module, and a heat insulation plate is arranged between the controller and the battery module.
7. A monitoring method of the monitoring system capable of performing the warning of the thermal runaway of the power battery in the whole period according to claim 1, characterized in that: and the wake-up controller monitors the pressure, the temperature and the gas concentration in the battery pack, and controls the one-way solenoid valve of the battery box body to open and perform early warning when the pressure, the temperature and the gas concentration in the battery pack meet any one or more of fault early warning triggering conditions.
8. The monitoring method of claim 7, wherein: the fault early warning triggering condition comprises
The voltage of the single battery is smaller than a set voltage threshold, the duration reaches a set first time threshold, meanwhile, the highest temperature of the single battery is larger than a set temperature threshold, and the duration reaches a set second time threshold;
the voltage of the single battery is smaller than a set voltage threshold, the duration reaches a set first time threshold, the temperature change rate of the single battery is larger than a set temperature change rate, and the duration reaches a set second time threshold;
the voltage of the single battery is smaller than a set voltage threshold, the duration reaches a set first time threshold, meanwhile, the temperature difference of the single battery is larger than a set temperature difference threshold, and the duration reaches a set second time threshold;
the highest temperature of the single battery is larger than a set temperature threshold, the duration reaches a set second time threshold, and meanwhile the number of voltage sampling open circuit faults is not smaller than 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010610848.1A CN111907329B (en) | 2020-06-29 | 2020-06-29 | Monitoring system and monitoring method capable of carrying out power battery full-time thermal runaway early warning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010610848.1A CN111907329B (en) | 2020-06-29 | 2020-06-29 | Monitoring system and monitoring method capable of carrying out power battery full-time thermal runaway early warning |
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| CN112615069A (en) * | 2020-12-04 | 2021-04-06 | 上海捷新动力电池系统有限公司 | Thermal runaway detection early warning system and thermal runaway judgment method for power battery system |
| CN112731169B (en) * | 2020-12-22 | 2022-08-23 | 上汽大众汽车有限公司 | All-weather monitoring system and method for thermal runaway of power battery |
| CN112952221A (en) * | 2021-02-02 | 2021-06-11 | 云度新能源汽车股份有限公司 | Power battery thermal runaway multi-stage early warning method and system |
| CN113036250B (en) * | 2021-02-27 | 2022-11-18 | 重庆长安新能源汽车科技有限公司 | Power battery thermal runaway whole-time monitoring system and method and new energy automobile |
| CN113517477B (en) * | 2021-03-04 | 2024-07-12 | 淮安骏盛新能源科技有限公司 | Auxiliary monitoring method and alarm device for thermal runaway of power battery in battery pack |
| CN113119737B (en) * | 2021-04-28 | 2023-02-21 | 中国第一汽车股份有限公司 | Power battery thermal runaway monitoring device and method and power battery system |
| CN117013210B (en) * | 2023-10-07 | 2023-12-08 | 江苏华友能源科技有限公司 | Temperature sensing and inductance integrated busbar and battery pack internal temperature acquisition method |
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