CN111267618B - Early warning control method and system for thermal runaway of automobile battery - Google Patents
Early warning control method and system for thermal runaway of automobile battery Download PDFInfo
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- CN111267618B CN111267618B CN202010063497.7A CN202010063497A CN111267618B CN 111267618 B CN111267618 B CN 111267618B CN 202010063497 A CN202010063497 A CN 202010063497A CN 111267618 B CN111267618 B CN 111267618B
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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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- 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
- H01M10/486—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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- 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 invention discloses an automobile battery thermal runaway early warning control method and system, wherein the method is applied to the system, the system comprises a vehicle control unit and a battery pack, the battery pack comprises a battery core, a flexible circuit board and an explosion-proof valve, the flexible circuit board is arranged on the explosion-proof valve, the flexible circuit board comprises a first detection loop and a second detection loop, and the method comprises the following steps: acquiring state information of a battery; comparing the state information with each preset judging condition to obtain a first comparison result and generate first prompt information or second prompt information; when the battery is in an abnormal working state, acquiring a first voltage value of a first detection loop and a second voltage value of a second detection loop; when the first voltage value and the second voltage value are not smaller than the first preset value, third prompt information is displayed and used for prompting that the battery is in a thermal runaway state; according to the invention, whether the thermal runaway is in a state is judged by detecting the on-off of the loop according to the state information, so that the early warning of the thermal runaway is more reliable.
Description
Technical Field
The invention relates to the technical field of automobile batteries, in particular to an early warning control method and system for thermal runaway of an automobile battery.
Background
With the development of economy, the automobile industry is also developed, the holding capacity of electric automobiles is continuously increased, power batteries are important power sources of the electric automobiles, and the safety of the power batteries is the problem to be considered and solved in the development process of the electric automobiles.
In the prior art, two signals of voltage and temperature coupling are used as an early warning strategy, and when the voltage of a battery is detected for early warning, the voltage change of the battery is small when thermal runaway occurs, so that the battery is mixed with the voltage change of a normal battery, and the battery is difficult to distinguish. When the temperature value of the battery is used as an early warning strategy, the temperature detection circuit is only arranged on a plurality of battery cores and does not cover all the battery cores, and when the battery cores which are not provided with the temperature detection circuit are out of thermal runaway, the battery cannot be judged to be out of thermal runaway, so that when the battery cores are out of thermal runaway, the battery cannot be accurately and effectively distinguished, and which battery core is out of thermal runaway cannot be positioned, and therefore effective protection measures cannot be carried out.
Based on the defects in the prior art, an early warning control method and system for thermal runaway of an automobile battery are urgently needed to be researched to solve the problems.
Disclosure of Invention
In order to solve the technical problem, the invention discloses an automobile battery thermal runaway early warning control method and system, wherein a first detection loop and a second detection loop are added, and whether the battery is in a thermal runaway state is judged according to the state information of the battery, the on-off of the first detection loop and the on-off of the second detection loop, so that the risks of missing report and false report of the thermal runaway of the battery are reduced, and the early warning of the thermal runaway is more reliable.
The invention discloses an automobile battery thermal runaway early warning control method and system, wherein the automobile battery thermal runaway early warning control method is applied to an automobile battery thermal runaway early warning control system, the automobile battery thermal runaway early warning control system comprises a vehicle control unit and a battery pack, the vehicle control unit is electrically connected with the battery pack, the battery pack comprises an electric core and a flexible circuit board arranged on the electric core, the flexible circuit board comprises a first detection loop and a second detection loop, and the method comprises the following steps:
acquiring state information of a battery;
comparing the state information with each preset judging condition to obtain a first comparison result, and generating first prompt information or second prompt information according to the first comparison result, wherein the first prompt information is used for prompting that the battery is in an abnormal working state, and the second prompt information is used for prompting that the battery is in a normal working state;
when the battery is in an abnormal working state, acquiring a first voltage value of a first detection loop and a second voltage value of a second detection loop;
comparing the first voltage value and the second voltage value with a first preset value respectively;
and when the first voltage value and the second voltage value are not smaller than a first preset value, displaying third prompt information, wherein the third prompt information is used for prompting that the battery is in a thermal runaway state.
Further, the thermal runaway early warning control system for the automobile battery comprises: the temperature detection circuit and the voltage detection circuit are both electrically connected with the vehicle control unit;
the acquiring of the state information of the battery comprises:
acquiring a temperature value of the battery cell according to a temperature detection circuit;
acquiring a voltage value of the battery cell according to the voltage detection circuit;
and taking the temperature value of the battery cell and the voltage value of the battery cell as the state information of the battery.
Further, the comparing the state information with each preset discrimination condition to obtain a first comparison result, and generating first prompt information or second prompt information according to the first comparison result, where the first prompt information is used to prompt that the battery is in an abnormal working state, and the second prompt information is used to prompt that the battery is in a normal working state includes:
acquiring the temperature change rate of the battery cell within a preset time length;
comparing the rate of temperature change to a first rate of temperature change threshold;
when the temperature change rate of the battery cell is smaller than a first temperature change rate threshold value within a preset time length, generating second prompt information for prompting that the battery is in a normal working state;
and when the temperature change rate of the battery cell is not less than a first temperature change rate threshold value within a preset time length, comparing the temperature value of the battery cell with the first temperature threshold value, and generating corresponding first prompt information or second prompt information according to a second comparison result.
Further, when the temperature change rate of the battery cell is not less than a first temperature change rate threshold within a preset time period, comparing the temperature value of the battery cell with the first temperature threshold, and generating corresponding first prompt information or second prompt information according to a second comparison result includes:
comparing the temperature of the cell to a first temperature threshold;
when the temperature value of the battery core is not smaller than a first temperature threshold value, generating first prompt information, wherein the first prompt information is used for prompting that the battery is in an abnormal working state;
comparing the voltage value of the battery cell with a first voltage threshold when the temperature value of the battery cell is less than the first temperature threshold;
when the voltage value is not smaller than the first voltage threshold value, generating first prompt information;
and when the voltage value is smaller than the first voltage threshold value, generating second prompt information, wherein the second prompt information is used for prompting that the battery is in a normal working state.
Further, the automobile battery thermal runaway early warning control system further comprises a detection device, the detection device is respectively connected with the first detection loop and the second detection loop, and when the battery is in an abnormal working state, acquiring a first voltage value of the first detection loop and a second voltage value of the second detection loop comprises:
and when the battery is in an abnormal working state, acquiring the first voltage value and the second voltage value detected by the detection device.
Furthermore, the automobile battery thermal runaway early warning control system also comprises an alarm, and the alarm is electrically connected with the whole automobile controller;
when the first voltage value and the second voltage value are not less than a first preset value, displaying third prompt information, wherein the third prompt information is used for prompting that the battery is in a thermal runaway state and comprises the following steps:
when the first voltage value and the second voltage value are not smaller than a first preset value, the first detection circuit and the second detection circuit are both judged to be in an open circuit state;
and when the first detection circuit and the second detection circuit are in an open circuit state, controlling an alarm to display third prompt information.
Further, after comparing the first voltage value and the second voltage value with a first preset value, the method further includes:
and when the first voltage value is smaller than the first preset value and/or the second voltage value is smaller than the first preset value, controlling an alarm to display fourth prompt information, wherein the fourth prompt information is used for prompting that the battery is in a non-thermal runaway state.
The invention also provides an automobile battery thermal runaway early warning control system for realizing the automobile battery thermal runaway early warning control method, wherein the system comprises a whole automobile controller and a battery pack;
the battery pack comprises a battery core and a flexible circuit board arranged on the battery core, wherein the flexible circuit board comprises a first detection circuit and a second detection circuit;
the vehicle control unit is used for: acquiring state information of a battery; comparing the state information with each preset judging condition to obtain a first comparison result, and generating first prompt information or second prompt information according to the first comparison result, wherein the first prompt information is used for prompting that the battery is in an abnormal working state, and the second prompt information is used for prompting that the battery is in a normal working state; when the battery is in an abnormal working state, acquiring a first voltage value of a first detection loop and a second voltage value of a second detection loop; comparing the first voltage value and the second voltage value with a first preset value respectively;
and when the first voltage value and the second voltage value are not smaller than a first preset value, displaying third prompt information, wherein the third prompt information is used for prompting that the battery is in a thermal runaway state.
Further, the device also comprises a detection device;
the detection device is electrically connected with the vehicle control unit and used for acquiring the first voltage value and the second voltage value and sending the first voltage value and the second voltage value to the vehicle control unit.
The temperature detection circuit and the voltage detection circuit are both electrically connected with the vehicle control unit, the temperature detection circuit is used for acquiring the temperature value of the battery cell, and the voltage detection circuit is used for acquiring the voltage value of the battery cell.
The embodiment of the invention has the following beneficial effects:
according to the invention, the first detection loop and the second detection loop are added, and whether the battery is in the thermal runaway state is judged according to the state information of the battery, the on-off of the first detection loop and the on-off of the second detection loop, so that the risks of false alarm and missing report of the thermal runaway of the battery are reduced, and the early warning of the thermal runaway is more reliable.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiment or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a flowchart of an early warning control method for thermal runaway of an automobile battery according to an embodiment of the present invention;
FIG. 2 is a structural diagram of an early warning control system for thermal runaway of an automobile battery according to an embodiment of the invention;
fig. 3 is a schematic diagram of a battery pack according to an embodiment of the present invention.
Wherein the reference numerals in the figures correspond to:
1-a vehicle control unit; 2-a detection device; 3-a battery pack; 21-a temperature detection circuit; 22-a voltage detection circuit; 31-electric core; 32-an explosion-proof valve; 33-a first detection loop; 34-a second detection loop; 35-a flexible circuit board; 4-alarm.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The prior art has the following defects: the prior art is as early warning strategy through these two kinds of signals of voltage and temperature coupling, because the temperature sampling in the module is generally only two, be not enough to cover all electric cores, so this kind of scheme is not enough to judge whether thermal runaway has taken place, the response is slower, there is very big probability of failing to report, and under the condition that thermal runaway does not take place, also there is the condition that voltage and temperature signal are unusual, just there is certain wrong report risk under this kind of condition, and there is the response slow, application scope is limited, technical problem such as cost and consumption height.
Aiming at the defects of the prior art, the embodiment of the invention provides an early warning control method and a system for thermal runaway of an automobile battery.
Referring to fig. 1 to fig. 3, the present embodiment provides an automobile battery thermal runaway early warning control method and an automobile battery thermal runaway early warning control system, where the automobile battery thermal runaway early warning control method is applied to an automobile battery thermal runaway early warning control system, where the automobile battery thermal runaway early warning control system includes a vehicle control unit and a battery pack, the vehicle control unit is electrically connected to the battery pack, the battery pack includes an electric core and a flexible circuit board disposed on the electric core, the flexible circuit board includes a first detection loop and a second detection loop, and the method includes:
s1: acquiring state information of a battery;
s2: comparing the state information with each preset judging condition to obtain a first comparison result, and generating first prompt information or second prompt information according to the first comparison result, wherein the first prompt information is used for prompting that the battery is in an abnormal working state, and the second prompt information is used for prompting that the battery is in a normal working state;
s3: when the battery is in an abnormal working state, acquiring a first voltage value of a first detection loop and a second voltage value of a second detection loop;
s4: comparing the first voltage value and the second voltage value with a first preset value respectively;
s5: and when the first voltage value and the second voltage value are not smaller than a first preset value, displaying third prompt information, wherein the third prompt information is used for prompting that the battery is in a thermal runaway state.
It should be noted that: the battery pack comprises a plurality of battery cells, wherein each battery cell is provided with an explosion-proof valve, and the explosion-proof valves are used for preventing gas of the battery cells from being discharged and preventing the battery cells from exploding; the flexible circuit board sets up in a plurality of on the electricity core, just first detection return circuit with the second detection return circuit all sets up every the top of explosion-proof valve, the main purpose that sets up like this is, as long as the explosion-proof valve of an electricity core spouts the fast-speed gas of high temperature, the homoenergetic makes first detection return circuit with the second detection return circuit is fused, sets up the main objective in two detection return circuits and is: the situation that one detection loop is in an open circuit state due to external force and false thermal runaway of the battery is reported is avoided, whether the battery is in the thermal runaway state is judged through the state information of the battery, the on-off of the first detection loop and the on-off of the second detection loop, the risks of false report and false report of the thermal runaway of the battery are reduced, and the early warning of the thermal runaway is more reliable.
Specifically, under normal use conditions of the battery, the battery cell does not generate high-temperature and high-speed gas, and the high-temperature and high-speed gas is generated only when the battery cell is thermally out of control.
Preferably, the thermal runaway early warning control system for the automobile battery comprises: the temperature detection circuit and the voltage detection circuit are both electrically connected with the vehicle control unit;
the acquiring of the state information of the battery comprises:
acquiring a temperature value of the battery cell according to a temperature detection circuit;
acquiring a voltage value of the battery cell according to the voltage detection circuit;
and taking the temperature value of the battery cell and the voltage value of the battery cell as the state information of the battery.
Preferably, the comparing the state information with each preset discrimination condition to obtain a first comparison result, and generating first prompt information or second prompt information according to the first comparison result, where the first prompt information is used to prompt that the battery is in an abnormal working state, and the second prompt information is used to prompt that the battery is in a normal working state includes:
acquiring the temperature change rate of the battery cell within a preset time length;
comparing the rate of temperature change to a first rate of temperature change threshold;
when the temperature change rate of the battery cell is smaller than a first temperature change rate threshold value within a preset time length, generating second prompt information for prompting that the battery is in a normal working state;
and when the temperature change rate of the battery cell is not less than a first temperature change rate threshold value within a preset time length, comparing the temperature value of the battery cell with the first temperature threshold value, and generating corresponding first prompt information or second prompt information according to a second comparison result.
Specifically, the obtaining the temperature change rate of the battery cell within the preset time includes:
setting a preset time length, wherein the preset time length is generally set to be 3 seconds;
acquiring the temperature change rate of the battery cell within a preset time length;
acquiring temperature values of a plurality of battery cells within a preset time length, and calculating the change of the temperature values of the battery cells within each second;
comparing the rate of change of the temperature of the electrical core per second to the first rate of change of the temperature;
when the temperature change rate of the battery cell is not smaller than the first temperature change rate within a preset time length, continuously comparing the temperature value of the battery cell with a first temperature threshold value;
and when the temperature change rate of the battery cell is smaller than the first temperature change rate within a preset time length, generating second prompt information for prompting that the battery is in a normal working state.
Preferably, when the temperature change rate of the battery cell is not less than a first temperature change rate threshold within a preset time period, comparing the temperature value of the battery cell with the first temperature threshold, and generating corresponding first prompt information or second prompt information according to a second comparison result includes:
comparing the temperature of the cell to a first temperature threshold;
when the temperature value of the battery core is not smaller than a first temperature threshold value, generating first prompt information, wherein the first prompt information is used for prompting that the battery is in an abnormal working state;
comparing the voltage value of the battery cell with a first voltage threshold when the temperature value of the battery cell is less than the first temperature threshold;
when the voltage value is not smaller than the first voltage threshold value, generating first prompt information;
when the voltage value is smaller than the first voltage threshold, second prompt information is generated and used for prompting that the battery is in a normal working state, a first detection loop and a second detection loop are added, and whether the battery is in a thermal runaway state is judged according to the state information of the battery, the on-off of the first detection loop and the on-off of the second detection loop, so that the risks of false alarm and missed alarm of the thermal runaway of the battery are reduced, and the early warning of the thermal runaway is more reliable.
Specifically, after the comparison with the first temperature threshold, the comparison is also performed with the temperature value of the battery cell and the voltage value of the battery cell, so as to eliminate the abnormal state data of the battery cell caused by some special situations.
Specifically, when the temperature change rate of the battery cell is not less than the first temperature change rate and the temperature value of the battery cell is not less than the first temperature threshold, generating first prompt information and determining that the battery is in an abnormal working state;
and when the temperature change rate of the battery cell is not less than the first temperature change rate, the temperature value of the battery cell is less than the first temperature threshold value, and the voltage value of the battery cell is not less than the first voltage threshold value, generating first prompt information, and judging that the battery is in an abnormal working state.
Specifically, the first voltage threshold may be set to 85% of the initial voltage of the battery, the first temperature threshold may be set to a maximum temperature specified by the battery, and the first temperature change rate may be set to 1 °/s.
Preferably, the automobile battery thermal runaway early warning control system further includes a detection device, the detection device is respectively connected with the first detection loop and the second detection loop, and when the battery is in an abnormal working state, acquiring a first voltage value of the first detection loop and a second voltage value of the second detection loop includes:
and when the battery is in an abnormal working state, acquiring the first voltage value and the second voltage value detected by the detection device.
Preferably, the automobile battery thermal runaway early warning control system further comprises an alarm, and the alarm is electrically connected with the whole automobile controller;
when the first voltage value and the second voltage value are not less than a first preset value, displaying third prompt information, wherein the third prompt information is used for prompting that the battery is in a thermal runaway state and comprises the following steps:
when the first voltage value and the second voltage value are not smaller than a first preset value, the first detection circuit and the second detection circuit are both judged to be in an open circuit state;
when the first detection loop and the second detection loop are in an open-circuit state, the warning device is controlled to display third prompt information, and a warning strategy is manufactured through the combination of the state information of the battery and the open-circuit state of the detection loop, so that the interference of unnecessary signals is avoided, the strategy for warning the thermal runaway of the battery pack is applied to various working conditions, and the application of the warning strategy is wider.
Specifically, when the battery is in an abnormal state, the on-off of the first detection loop and the second detection loop is detected, and when the first detection loop and the second detection loop are both in an open circuit state, third prompt information is displayed, and the battery is judged to be in a thermal runaway state.
Preferably, after comparing the first voltage value and the second voltage value with a first preset value respectively, the method further includes:
and when the first voltage value is smaller than the first preset value and/or the second voltage value is smaller than the first preset value, controlling an alarm to display fourth prompt information, wherein the fourth prompt information is used for prompting that the battery is in a non-thermal runaway state.
Specifically, when the first detection loop and the second detection loop are not in an open circuit state at the same time, a fourth prompt message is displayed, and it is determined that the battery is in a non-thermal runaway state.
The invention also provides an automobile battery thermal runaway early warning control system which is used for realizing the automobile battery thermal runaway early warning control method and comprises a whole automobile controller 1 and a battery pack 3;
the battery pack comprises a battery core 31, a flexible circuit board 35 and an explosion-proof valve 32 arranged on the battery core 31, wherein the flexible circuit board 35 is arranged on the explosion-proof valve 32, and the flexible circuit board 35 comprises a first detection circuit 33 and a second detection circuit 34;
the vehicle control unit 1 is configured to: acquiring state information of a battery; comparing the state information with each preset judging condition to obtain a first comparison result, and generating first prompt information or second prompt information according to the first comparison result, wherein the first prompt information is used for prompting that the battery is in an abnormal working state, and the second prompt information is used for prompting that the battery is in a normal working state; when the battery is in an abnormal working state, acquiring a first voltage value of a first detection loop 33 and a second voltage value of a second detection loop; comparing the first voltage value and the second voltage value with a first preset value respectively; when the first voltage value and the second voltage value are not smaller than the first preset value, third prompt information is displayed, the third prompt information is used for prompting that the battery is in a thermal runaway state, a first detection loop 33 and a second detection loop 34 are added, and whether the battery is in the thermal runaway state is judged according to the state information of the battery, the on-off of the first detection loop 33 and the on-off of the second detection loop 34, so that the risks of false alarm and false alarm of thermal runaway of the battery are reduced, and the early warning of the thermal runaway is more reliable.
Specifically, the routing forms of the first detection circuit 33 and the second detection circuit 34 on the flexible circuit board 35 are not limited, as long as it is ensured that the first detection circuit 33 is above the explosion-proof valves 32 of the plurality of battery cells, the second detection circuit 34 is above the explosion-proof valves 32 of the plurality of battery cells, and it is ensured that the first detection circuit 33 and the second detection circuit 34 do not affect each other, the detection circuit is arranged on the explosion-proof valves 32, so that when the battery cell 31 is in thermal runaway, a result can be fed back quickly, and the response of the early warning strategy of the present invention is quicker.
Specifically, the routing manner of the first detection loop 33 and the second detection loop 34 may be an S-shaped routing or a loop-shaped routing, and other routing manners meeting the condition are also protected by the present invention.
Specifically, the system further comprises an alarm 4, the alarm 4 is electrically connected with the vehicle control unit 1, the alarm 4 is used for sending the first prompt message, the second prompt message, the third prompt message and the fourth prompt message, and the first prompt message is used for prompting that the battery is in an abnormal working state; the second prompt message is used for the battery to be in a normal working state; the third prompt message is used for the battery to be in a thermal runaway state; the fourth prompt message is used for the battery to be in a non-thermal runaway state; the alarm 4 may comprise a display screen or a voice prompt device; the first prompt message, the second prompt message, the third prompt message and the second prompt message may be voice prompts or image prompts.
Preferably, also comprises detection means 2;
the detection device 2 is electrically connected with the vehicle control unit 1, and the detection device 2 is configured to acquire the first voltage value and the second voltage value and send the first voltage value and the second voltage value to the vehicle control unit 1.
Specifically, the detection device 2 comprises a conditioning circuit, a detection circuit and an external power supply, wherein the conditioning circuit is used for performing voltage stabilization processing on the input voltage of the external power supply; the detection circuit is used for detecting the on-off states of the first detection loop 33 and the second detection loop 34;
after the first detection loop 33 and the second detection loop 34 are connected in parallel, one end of the first detection loop is connected with the conditioning circuit, the other end of the first detection loop is connected with the detection circuit, the external power supply is connected with the conditioning circuit, and the external power supply supplies power to the first detection loop 33 and the second detection loop 34 through the conditioning circuit.
The first detection circuit 33 and the second detection circuit 34 have the same structure, and the first detection circuit 33 includes a resistor;
when the first detection circuit 33 or the second detection circuit 34 is disconnected, the voltage detected by the detection circuit rises; therefore, when the voltage is higher than the first preset value, it is determined that the first detection circuit 33 or the second detection circuit 34 is disconnected, and power is supplied to the detection circuit through an external power supply, so that power consumption is reduced.
In another embodiment, the detection device 2 includes a detection circuit and an external power source, after the first detection circuit 33 and the second detection circuit 34 are connected in parallel, one end of the detection circuit is connected to the external power source, and the other end of the detection circuit is connected to the detection circuit to form a circuit, and the external power source directly supplies power to the first detection circuit 33 and the second detection circuit 34.
In other embodiments, a detection circuit is provided, and the detection circuit is provided above the explosion-proof valves of the plurality of battery cells.
In other embodiments, a plurality of detection loops are provided, and the detection loops are all arranged above the explosion-proof valves of the battery cells.
Preferably, the vehicle control system further comprises a temperature detection circuit 21 and a voltage detection circuit 22, the temperature detection circuit 21 and the voltage detection circuit 22 are both electrically connected to the vehicle control unit 1, the temperature detection circuit 21 is configured to acquire a temperature value of the battery cell 31, and the voltage detection circuit 22 is configured to acquire a voltage value of the battery cell 31.
The working process of the automobile battery thermal runaway early warning control system is as follows: when the automobile is started, the automobile battery thermal runaway early warning control system starts to work, and at the moment, the state information of the battery is acquired; comparing the state information with each preset judging condition to obtain a first comparison result, and controlling an alarm 4 to generate first prompt information or second prompt information according to the first comparison result, wherein the first prompt information is used for prompting that the battery is in an abnormal working state, and the second prompt information is used for prompting that the battery is in a normal working state; when the battery is in an abnormal working state, acquiring a first voltage value of a first detection loop 33 and a second voltage value of a second detection loop 34; comparing the first voltage value and the second voltage value with a first preset value respectively; and when the first voltage value and the second voltage value are not less than the first preset value, controlling an alarm 4 to display third prompt information, wherein the third prompt information is used for prompting that the battery is in a thermal runaway state.
The vehicle with the automobile battery thermal runaway early warning control system can judge whether the battery is in a thermal runaway state or not through the state information of the battery, the on-off of the first detection loop 33 and the on-off of the second detection loop 34, so that the risks of battery thermal runaway missing report and false report are reduced, and the early warning of the thermal runaway is more reliable.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (6)
1. The automobile battery thermal runaway early warning control method is characterized by being applied to an automobile battery thermal runaway early warning control system, wherein the automobile battery thermal runaway early warning control system comprises a whole automobile controller, a battery pack, a temperature detection circuit and a voltage detection circuit, and the temperature detection circuit and the voltage detection circuit are both electrically connected with the whole automobile controller; the vehicle control unit is electrically connected with the battery pack, the battery pack comprises an electric core, a flexible circuit board and an explosion-proof valve arranged on the electric core, the flexible circuit board is arranged on the explosion-proof valve and comprises a first detection circuit and a second detection circuit, and the method comprises the following steps:
acquiring a temperature value of the battery cell according to a temperature detection circuit;
acquiring a voltage value of the battery cell according to the voltage detection circuit;
taking the temperature value of the battery cell and the voltage value of the battery cell as state information of the battery;
acquiring the temperature change rate of the battery cell within a preset time length;
comparing the rate of temperature change to a first rate of temperature change threshold;
when the temperature change rate of the battery cell is smaller than a first temperature change rate threshold value within a preset time length, generating second prompt information for prompting that the battery is in a normal working state;
when the temperature change rate of the battery cell is not less than a first temperature change rate threshold value within a preset time period, comparing the temperature of the battery cell with the first temperature threshold value;
when the temperature value of the battery core is not smaller than a first temperature threshold value, generating first prompt information, wherein the first prompt information is used for prompting that the battery is in an abnormal working state;
comparing the voltage value of the battery cell with a first voltage threshold when the temperature value of the battery cell is less than the first temperature threshold;
when the voltage value is not smaller than the first voltage threshold value, generating first prompt information;
when the voltage value is smaller than the first voltage threshold value, generating second prompt information, wherein the second prompt information is used for prompting that the battery is in a normal working state;
when the battery is in an abnormal working state, acquiring a first voltage value of a first detection loop and a second voltage value of a second detection loop;
comparing the first voltage value and the second voltage value with a first preset value respectively;
and when the first voltage value and the second voltage value are not smaller than a first preset value, displaying third prompt information, wherein the third prompt information is used for prompting that the battery is in a thermal runaway state.
2. The method as claimed in claim 1, wherein the system further comprises a detection device, the detection device is connected to the first detection loop and the second detection loop, and the obtaining the first voltage value of the first detection loop and the second voltage value of the second detection loop when the battery is in the abnormal operating state comprises:
and when the battery is in an abnormal working state, acquiring the first voltage value and the second voltage value detected by the detection device.
3. The vehicle battery thermal runaway early warning control method according to claim 2, wherein the vehicle battery thermal runaway early warning control system further comprises an alarm, the alarm being electrically connected to the vehicle controller;
when the first voltage value and the second voltage value are not less than a first preset value, displaying third prompt information, wherein the third prompt information is used for prompting that the battery is in a thermal runaway state and comprises the following steps:
when the first voltage value and the second voltage value are not smaller than a first preset value, the first detection circuit and the second detection circuit are both judged to be in an open circuit state;
and when the first detection circuit and the second detection circuit are in an open circuit state, controlling an alarm to display third prompt information.
4. The method as claimed in claim 3, wherein the comparing the first voltage value and the second voltage value with the first preset value further comprises:
and when the first voltage value is smaller than the first preset value and/or the second voltage value is smaller than the first preset value, controlling an alarm to display fourth prompt information, wherein the fourth prompt information is used for prompting that the battery is in a non-thermal runaway state.
5. An automobile battery thermal runaway early warning control system for realizing the automobile battery thermal runaway early warning control method as claimed in any one of claims 1 to 4, wherein the system comprises a whole automobile controller (1), a battery pack (3), a temperature detection circuit (21) and a voltage detection circuit (22);
the temperature detection circuit (21) and the voltage detection circuit (22) are both electrically connected with the vehicle control unit (1), the temperature detection circuit (21) is used for acquiring a temperature value of the battery cell (31), and the voltage detection circuit (22) is used for acquiring a voltage value of the battery cell (31);
the battery pack comprises a battery core (31), a flexible circuit board (35) and an explosion-proof valve (32) arranged on the battery core (31), wherein the flexible circuit board (35) is arranged on the explosion-proof valve (32), and comprises a first detection circuit (33) and a second detection circuit (34);
the vehicle control unit (1) is used for: acquiring a temperature value of the battery cell according to a temperature detection circuit; acquiring a voltage value of the battery cell according to the voltage detection circuit; taking the temperature value of the battery cell and the voltage value of the battery cell as state information of the battery; acquiring the temperature change rate of the battery cell within a preset time length; comparing the rate of temperature change to a first rate of temperature change threshold; when the temperature change rate of the battery cell is smaller than a first temperature change rate threshold value within a preset time length, generating second prompt information for prompting that the battery is in a normal working state; comparing the temperature of the cell to a first temperature threshold; when the temperature value of the battery core is not smaller than a first temperature threshold value, generating first prompt information, wherein the first prompt information is used for prompting that the battery is in an abnormal working state; comparing the voltage value of the battery cell with a first voltage threshold when the temperature value of the battery cell is less than the first temperature threshold; when the voltage value is not smaller than the first voltage threshold value, generating first prompt information; when the voltage value is smaller than the first voltage threshold value, generating second prompt information, wherein the second prompt information is used for prompting that the battery is in a normal working state; when the battery is in an abnormal working state, acquiring a first voltage value of a first detection loop and a second voltage value of a second detection loop; comparing the first voltage value and the second voltage value with a first preset value respectively; and when the first voltage value and the second voltage value are not smaller than a first preset value, displaying third prompt information, wherein the third prompt information is used for prompting that the battery is in a thermal runaway state.
6. The thermal runaway early warning control system of an automobile battery as claimed in claim 5, further comprising a detection device (2);
the detection device (2) is electrically connected with the vehicle control unit (1), and the detection device (2) is used for acquiring the first voltage value and the second voltage value and sending the first voltage value and the second voltage value to the vehicle control unit (1).
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| CN111913114A (en) * | 2020-07-23 | 2020-11-10 | 蜂巢能源科技有限公司 | Battery thermal runaway detection method and device, storage medium and electronic equipment |
| CN112180282B (en) * | 2020-09-24 | 2023-05-12 | 蜂巢能源科技股份有限公司 | Method, device, medium, system and vehicle for predicting thermal runaway probability of battery |
| CN112607820A (en) * | 2020-12-31 | 2021-04-06 | 中广核达胜加速器技术有限公司 | Management system of electron beam wastewater treatment device |
| CN112895976B (en) * | 2021-02-01 | 2022-06-24 | 重庆峘能电动车科技有限公司 | Battery cell early warning protection method and system |
| CN113921941B (en) * | 2021-09-10 | 2023-09-29 | 东风时代(武汉)电池系统有限公司 | Power battery pack thermal runaway control system and method |
| WO2023225975A1 (en) * | 2022-05-27 | 2023-11-30 | 宁德时代新能源科技股份有限公司 | Thermal runaway detection method and apparatus |
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