CN111370784A - Battery thermal runaway early warning method - Google Patents
Battery thermal runaway early warning method Download PDFInfo
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- CN111370784A CN111370784A CN202010107144.2A CN202010107144A CN111370784A CN 111370784 A CN111370784 A CN 111370784A CN 202010107144 A CN202010107144 A CN 202010107144A CN 111370784 A CN111370784 A CN 111370784A
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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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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
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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
- H01M10/4285—Testing apparatus
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/581—Devices or arrangements for the interruption of current in response to 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
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Abstract
The application provides a battery thermal runaway early warning method, which comprises the step of arranging at least one thermal runaway sensing element in a battery module in a preset wiring mode. The battery module comprises at least one battery cell. Each thermal runaway sensor is in contact with the first surface of the battery cell. Each thermal runaway perception piece is provided with at least one monitoring point, and the electric signal of each monitoring point is monitored. When any battery monomer in the battery module is in thermal runaway, the thermal runaway sensing piece is fused, and the electrical signal of at least one monitoring point on the thermal runaway sensing piece is abnormally fluctuated, so that thermal runaway early warning is carried out. The application utilizes the thermal runaway sensing piece with low melting point, and has the advantages of simple principle, strong operability, low cost and high detection speed. The method does not need complex calculation, has small data storage amount and calculation amount, can perform timely early warning before the thermal runaway occurs, and can reduce the harm caused by the thermal runaway to a great extent.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a battery thermal runaway early warning method.
Background
In order to relieve the problems of energy shortage and environmental pollution, new energy automobiles are already listed in strategic emerging technology industries in China. Motorization of automotive power systems has gradually become one of the major trends in future automotive technology development. One of the main features of motorization of automotive power systems is the use of electrical energy instead of chemical energy as the primary source of motive energy for vehicles. The lithium ion power battery has the characteristics of high specific energy, low self-discharge rate and long cycle life, and is the most practical pure electric vehicle energy source at present.
However, with the large-scale application of lithium ion batteries to electric vehicles, safety accidents of lithium ion power batteries, represented by thermal runaway, sometimes occur. Lithium ion power battery accidents are usually manifested by phenomena of temperature shock, smoke, fire and even explosion, which take thermal runaway as a core. Thermal runaway accidents often release large amounts of energy in a short period of time, and are very likely to cause casualties and property losses. Therefore, the thermal runaway accident can attack the confidence that people accept the electric automobile and prevent the electric automobile from being popularized.
Thermal runaway accidents of lithium ion power cells can be triggered by mechanical abuse (crushing, needling, bumping, etc.), electrical abuse (overcharge, overdischarge, internal short circuit, etc.), and thermal abuse. There is a certain internal link between the three abuses, wherein the mechanical abuse causes the deformation of the battery, the deformation of the battery can cause internal short circuit, namely, the electric abuse is caused, the electric abuse is often accompanied by joule heat, namely, the heat of chemical reaction, the heat accumulation causes the heat abuse, and finally the heat abuse causes the temperature of the battery to rise, thereby causing the thermal runaway chain reaction.
Although the causes of the thermal runaway accident of the lithium ion battery are many, the nature of the thermal runaway is a thermal problem, namely: before thermal runaway of the battery occurs, the battery temperature inevitably undergoes a change from normal to overheating. The temperature change process can be measured by a temperature sensor, but in the current lithium ion battery pack for a vehicle, a plurality of lithium ion battery cells often share one temperature sensor, so that the temperature sensor cannot accurately detect abnormal temperature rise of a certain cell or a certain region. Therefore, thermal runaway early warning cannot be realized based on the existing temperature signal.
Disclosure of Invention
Therefore, a battery thermal runaway early warning method is needed to be provided for the problem that the traditional thermal runaway early warning method is low in detection precision.
A battery thermal runaway early warning method comprises the following steps:
s10, arranging at least one thermal runaway sensing element in a battery module in a preset wiring mode, wherein the battery module comprises at least one battery monomer, and each thermal runaway sensing element is in contact with the first surface of the battery monomer;
s20, each thermal runaway sensing element is provided with at least one monitoring point, and the electric signal of each monitoring point is monitored;
s30, when the thermal runaway sensing member is fused, the electrical signal of at least one monitoring point on the thermal runaway sensing member is abnormally fluctuated, and then thermal runaway early warning is carried out.
In one embodiment, the step S20 of providing at least one monitoring point on each thermal runaway sensing element, and monitoring the electrical signal of each monitoring point includes:
one end of each thermal runaway sensing element is connected with a voltage source, the other end of each thermal runaway sensing element is grounded, each monitoring point is connected with a voltage detector, and the voltage value of each monitoring point is monitored by using the voltage detector.
In one embodiment, each monitoring point is arranged at any position where each thermal runaway sensing element is in contact with the battery cell.
In one embodiment, in S30, when the thermal runaway detector is to be fused, the step of performing an early warning of thermal runaway when an electrical signal of at least one monitoring point on the thermal runaway detector abnormally fluctuates includes:
and when the voltage value of at least one monitoring point on the thermal runaway sensing piece is abnormally fluctuated, performing thermal runaway early warning.
In one embodiment, a monitoring point is arranged at one end of each thermal runaway sensing element, which is close to the ground, and the monitoring point is not in contact with the battery cell.
In one embodiment, in S30, when the thermal runaway detector is to be fused, the step of performing an early warning of thermal runaway when an electrical signal of at least one monitoring point on the thermal runaway detector abnormally fluctuates includes:
and when the voltage value of the monitoring point is zero, performing thermal runaway early warning.
In one embodiment, the S20, where each thermal runaway detector is provided with at least one monitoring point, and monitoring the electrical signal of each monitoring point includes:
one end of each thermal runaway sensing element is grounded, and the resistance to ground of each monitoring point is monitored by a resistance detector.
In one embodiment, in S30, when the thermal runaway detector is to be fused, the step of performing an early warning of thermal runaway when an electrical signal of at least one monitoring point on the thermal runaway detector abnormally fluctuates includes:
and when the resistance value of at least one monitoring point on the thermal runaway sensing piece is abnormally fluctuated, performing thermal runaway early warning.
In one embodiment, in S10, the step of arranging at least one thermal runaway sensor in a battery module in a preset routing manner, where the battery module includes at least one battery cell, and before the step of contacting each thermal runaway sensor with the first surface of the battery cell, the step of:
the thermal runaway sensing piece is prepared by utilizing a metal material with a preset melting point temperature, wherein the preset melting point temperature is higher than the temperature of the battery module during normal work, and the preset melting point temperature is lower than the self-heat-generation starting temperature of the battery module.
In one embodiment, the predetermined routing manner is an S-type routing manner.
A computer device comprising a memory, a processor and a computer program stored on the memory and running on the processor, wherein the processor implements the steps of the battery thermal runaway pre-warning method in any one of the above embodiments when the computer program is executed by the processor.
The battery thermal runaway early warning method comprises the step of arranging at least one thermal runaway sensing element in a battery module in a preset wiring mode. The battery module comprises at least one battery cell. Each thermal runaway sensor is in contact with the first surface of the battery cell. Each thermal runaway perception piece is provided with at least one monitoring point, and the electric signal of each monitoring point is monitored. When any battery monomer in the battery module is in thermal runaway, the thermal runaway sensing piece is fused, and the electrical signal of at least one monitoring point on the thermal runaway sensing piece is abnormally fluctuated, so that thermal runaway early warning is carried out. The application utilizes the thermal runaway sensing piece with low melting point, and has the advantages of simple principle, strong operability, low cost and high detection speed. The method does not need complex calculation, has small data storage amount and calculation amount, can perform timely early warning before the thermal runaway occurs, and can reduce the harm caused by the thermal runaway to a great extent.
Drawings
Fig. 1 is a flowchart of a battery thermal runaway warning method according to an embodiment of the present disclosure;
fig. 2 is a graph of an ARC (adiabatic accelerated calorimetry) experiment for a lithium ion battery provided in an embodiment of the present application;
fig. 3 is a schematic diagram illustrating an implementation of a battery thermal runaway early warning method according to an embodiment of the present application;
FIG. 4 is a graph illustrating voltage signal distributions of a battery in a normal state according to an embodiment of the present application;
FIG. 5 is a graph illustrating voltage signal profiles of a battery at risk of thermal runaway according to one embodiment of the present disclosure;
fig. 6 is a schematic diagram illustrating an implementation of a battery thermal runaway warning method according to another embodiment of the present application;
fig. 7 is a schematic diagram illustrating an implementation of a battery thermal runaway warning method according to yet another embodiment of the present application;
FIG. 8 is a graph illustrating resistance signals during a normal state of a battery according to an embodiment of the present disclosure;
fig. 9 is a graph illustrating various resistance signal distributions when a battery is at risk of thermal runaway according to an embodiment of the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present application provides a method for warning thermal runaway of a battery. The battery thermal runaway early warning method comprises the following steps:
s10, arranging at least one thermal runaway sensing element in a battery module in a preset wiring mode, wherein the battery module comprises at least one battery monomer, and each thermal runaway sensing element is in contact with the first surface of the battery monomer. In step S10, the shape and structure of the thermal runaway sensing element are not specifically limited, and optionally, the thermal runaway sensing element is a fuse. The fuse wire is prepared by using a metal material with a preset melting point temperature. The preset melting point temperature is higher than the temperature of the battery module during normal operation, and is lower than the self-heat-generation initial temperature of the battery module. As shown in FIG. 2, the melting point temperature of the tin-based alloy is 70 ℃ to 100 ℃, which is lower than the self-heat-generation starting temperature (e.g. about 120 ℃) of the battery, is further lower than the thermal runaway highest temperature (e.g. about 800 ℃) of the battery, and is higher than the normal working temperature (e.g. -10 ℃ to 60 ℃) of the battery. And the fuse wire made of the alloy has certain conductivity. The shape of the preset wiring mode is not particularly limited, as long as the thermal runaway sensing element is reasonably arranged in the battery module, and in an optional embodiment, the preset wiring mode is an S-shaped wiring mode.
And S20, setting at least one monitoring point on each thermal runaway sensing element, and monitoring the electric signal of each monitoring point. In step S20, the electrical signal may be a voltage signal. The electrical signal may be a resistive signal.
S30, when the thermal runaway sensing member is fused, the electric signal of at least one monitoring point on the thermal runaway sensing member is abnormally fluctuated, and then the thermal runaway early warning is carried out. The voltage is applied to the two ends of the fuse wire, so that the potential of the fuse wire to the ground can be measured at different positions on the fuse wire; the resistance to one end of the fuse wire at different positions can be directly detected, and whether the fuse wire is fused or not and where the fuse wire is fused can be judged. In step S30, under normal conditions, the thermal runaway sensing elements are not fused, each thermal runaway sensing element maintains an electrical path, and each electrical signal fluctuates slightly near its respective stable signal. When the temperature of a single battery or a battery unit rises to the fusing temperature of the fuse wire, a certain thermal runaway sensing member nearby the single battery or the battery unit is fused, an electric path of the thermal runaway sensing member is damaged, and an electric signal of each monitoring point on the thermal runaway sensing member abnormally fluctuates, for example, the value of the electric signal is suddenly increased or suddenly reduced to zero. By monitoring the signal change, thermal runaway early warning is carried out, and the position of a monomer or unit with higher temperature can be accurately judged.
In the embodiment, the thermal runaway sensing element with a low melting point is utilized, the principle is simple, the operability is strong, the cost is low, and the detection speed is high. The method does not need complex calculation, has small data storage amount and calculation amount, can perform timely early warning before the thermal runaway occurs, and can reduce the harm caused by the thermal runaway to a great extent.
In one embodiment, S20, each thermal runaway sensing element is provided with at least one monitoring point, and the step of monitoring the electrical signal of each monitoring point includes connecting one end of each thermal runaway sensing element to a voltage source. The other end of each thermal runaway sensing element is grounded, and each monitoring point is connected with a voltage detector. The voltage value of each monitoring point is monitored by a voltage detector. And when the voltage value of at least one monitoring point on the thermal runaway sensing piece is abnormally fluctuated, performing thermal runaway early warning.
Optionally, each monitoring point is disposed at any position where each thermal runaway sensing element is in contact with the battery cell. And when the voltage value of at least one monitoring point on the thermal runaway sensing piece is abnormally fluctuated, performing thermal runaway early warning.
Specifically, referring to fig. 3, the battery module is composed of 5 battery units, each battery unit includes 6 battery cells, a cylindrical battery is used as a representative in the schematic diagram for illustrating the principle, and similar operations can be performed for a square-casing battery and a pouch battery. A fuse is wound around the entire battery module in an S-shaped arrangement (or in other arrangements), and the gap between the fuse and the battery cell is shown only for clarity of illustration, and in practice, the fuse should be in close contact with the surface of the battery. One end of the fuse wire is connected with a constant voltage power supply V through a 10k omega pull-up resistorDThe other end of the fuse is grounded GND (0V) through a 10k omega pull-down resistor, 5 voltage measuring points are arranged on the fuse wire and marked as voltage measuring points 1-5, each measuring point is connected with a signal bus, and the signal bus connects a voltage signal V of each measuring pointMeasuring point iAnd transmitted to the control unit in real time.
When the entire battery module is in a normal operation state,the fuse wire is in an electric path state, and the resistance of the fuse wire is far smaller than the pull-up resistance and the pull-down resistance, so that the voltage signal V of each measuring point in the stateMeasuring point iComprises the following steps: vMeasuring point 1≈VMeasuring point 2≈VMeasuring point 3≈VMeasuring point 4≈VMeasuring point 5. As shown in fig. 4, V isDWhen the voltage is set to be 5V and the battery module is in a normal state, the signal V of each voltage measuring pointMeasuring point iIn the vicinity of the respective stable voltages, there is a small fluctuation due to the influence of noise. When the temperature of a certain single body in the battery unit 1 is higher than the fusing temperature of the fuse wire, the fuse wire near the single body is fused, it is noted that in fig. 3, both sides of each single body are respectively contacted with a part of the fuse wire, so the fuse wire will be fused on both sides of the single body with higher temperature (certainly, there is a possibility that the fuse wire is fused only on one side, for example, when one side of the single body generates heat significantly higher than the other side, and only the fusing on both sides is taken as an example for explanation), after the fusing occurs, the voltage measuring point 1 is suspended, and the voltage signal V is suspendedMeasuring point 1Uncertain (the voltage of the suspended measuring point can be pulled up or grounded by setting a high/low resistor), and voltage measuring points 2-5 and VDIs disconnected, so that V is now presentMeasuring point 2＝VMeasuring point 3＝VMeasuring point 4＝VMeasuring point 5When the temperature is 0, the control unit judges that the battery unit 1 has a thermal runaway risk, and performs thermal runaway early warning. Similarly, when the rest battery units have the risk of thermal runaway, similar analysis can be performed, and finally, the battery safety state corresponding to the voltage signal of each voltage measuring point can be obtained. As shown in fig. 5, when the battery unit 2 is at risk of thermal runaway, the signals of the voltage measurement points at this time can be known from the above analysis as follows: vMeasuring point 1＝VD＝5V；VMeasuring point 3＝VMeasuring point 4＝VMeasuring point 5When the value is 0, the control unit sends out a thermal runaway early warning signal that the thermal runaway risk exists in the battery unit 2.
Optionally, one end of each thermal runaway sensing element, which is close to the ground, is provided with a monitoring point, and the monitoring point is not in contact with the battery cell. And when the voltage value of the monitoring point is zero, performing thermal runaway early warning.
Specifically, referring to fig. 6, a fuse is disposed inside the battery module in an S-shaped arrangement, 1 voltage measuring point is disposed on the fuse outside the battery module, and a voltage measuring point signal V is providedMeasuring pointAnd transmitted to the control unit in real time. When the battery module is in a normal state, the fuse wire keeps an electric path, and the voltage measuring point signal VMeasuring pointIs about VD/2, high level signal; when the risk of thermal runaway exists in the battery module, the fuse wire is fused, and a voltage measuring point signal VMeasuring pointAnd (4) the signal is a low level signal, and the control unit sends out a thermal runaway early warning signal with a thermal runaway risk at the moment.
In one embodiment, S20, each thermal runaway sensing element is provided with at least one monitoring point, and the step of monitoring the electrical signal of each monitoring point includes grounding one end of each thermal runaway sensing element, and monitoring the resistance value to ground of each monitoring point by using a resistance detector. And when the resistance value of at least one monitoring point on the thermal runaway sensing piece is abnormally fluctuated, performing thermal runaway early warning.
Specifically, referring to fig. 7, the battery module is composed of 5 battery units, each battery unit includes 6 battery cells, and the schematic diagram also represents a cylindrical battery. One fuse wire bypasses the whole battery module in an S-shaped arrangement mode, and the fuse wire is tightly contacted with the surface of the battery. 6 resistance measuring points are arranged on the fuse wire, the resistance of the corresponding point to the GND end is measured and recorded as resistance measuring points 1-6, each resistance measuring point is connected with a signal bus, and the signal bus connects a resistance signal R of each measuring pointMeasuring point iAnd transmitted to the control unit in real time.
When the whole battery module is in a normal working state, the fuse wire is in an electric path state, and the resistance signal R of each measuring point in the state is considered to increase along with the increase of the length of the fuse wireMeasuring point iThe relationship of (1) is: rMeasuring point 1>RMeasuring point 2>RMeasuring point 3>RMeasuring point 4>RMeasuring point 5>RMeasuring point 6>0. As shown in FIG. 8, when the battery module is in a normal state, each resistance measurement point signal RMeasuring point iAround the respective stable value, due toThere is a small fluctuation due to the influence of noise. When the temperature of a certain single body in the battery unit 1 is higher than the fusing temperature of the fuse wire, the fuse wire near the single body is fused, it is noted that in fig. 7, both sides of each single body are respectively contacted with a part of the fuse wire, so the fuse wire will be fused at both sides of the single body with higher temperature (certainly, there is a possibility that the fuse wire is fused at only one side, and the fusing at both sides is only exemplified), after the fusing occurs, the resistance measuring points 1 and 2 are suspended, and the resistance signal R thereof is suspendedMeasuring point 1，RMeasuring point 2For an open circuit signal (pull-up resistor can be set to pull up the resistance of the suspended measurement point), and the measurement points 3-6 are connected to GND, so that R is connected at this timeMeasuring point 3-RMeasuring point 6And (4) keeping normal, judging that the thermal runaway risk exists in the battery unit 1 by the control unit at the moment, and performing thermal runaway early warning. Similarly, when the rest battery units have the risk of thermal runaway, similar analysis can be performed, and finally the battery safety state corresponding to the resistance signal of each resistance measuring point can be obtained. As shown in fig. 9, when the battery unit 2 is at risk of thermal runaway, the signals of the resistance measurement points at this time can be known from the above analysis as follows: rMeasuring point 1-RMeasuring point 3Is an open circuit signal; rMeasuring point 4-RMeasuring point 6The signal remains normal. At this time, the control unit sends out a thermal runaway early warning signal that the thermal runaway risk exists in the battery unit 2.
One embodiment of the present application provides a computer device. The computer device comprises a memory, a processor and a computer program stored on the memory and running on the processor, wherein the processor implements the steps of the battery thermal runaway pre-warning method in any one of the above embodiments when executing the computer program.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (11)
1. A battery thermal runaway early warning method is characterized by comprising the following steps:
s10, arranging at least one thermal runaway sensing element in a battery module in a preset wiring mode, wherein the battery module comprises at least one battery monomer, and each thermal runaway sensing element is in contact with the first surface of the battery monomer;
s20, each thermal runaway sensing element is provided with at least one monitoring point, and the electric signal of each monitoring point is monitored;
s30, when the thermal runaway sensing member is fused, the electrical signal of at least one monitoring point on the thermal runaway sensing member is abnormally fluctuated, and then thermal runaway early warning is carried out.
2. The warning method for thermal runaway of a battery as claimed in claim 1, wherein at least one monitoring point is provided on each thermal runaway sensing element at S20, and the step of monitoring the electrical signal at each monitoring point includes:
one end of each thermal runaway sensing element is connected with a voltage source, the other end of each thermal runaway sensing element is grounded, each monitoring point is connected with a voltage detector, and the voltage value of each monitoring point is monitored by using the voltage detector.
3. The battery thermal runaway early warning method of claim 2, wherein each monitoring point is arranged at any position where each thermal runaway sensing element is in contact with the battery cell.
4. The method for warning thermal runaway of a battery as claimed in claim 3, wherein the step S30 of warning the thermal runaway when the thermal runaway detector is about to be fused, and the step S of warning the thermal runaway when the electrical signal of at least one monitoring point on the thermal runaway detector abnormally fluctuates comprises:
and when the voltage value of at least one monitoring point on the thermal runaway sensing piece is abnormally fluctuated, performing thermal runaway early warning.
5. The battery thermal runaway early warning method of claim 2, wherein each thermal runaway sensing element is provided with a monitoring point at one end thereof close to ground, and the monitoring point is not in contact with the battery cell.
6. The method for warning against thermal runaway of a battery as claimed in claim 5, wherein the step S30, when the thermal runaway sensing member is to be fused, is that an electrical signal of at least one monitoring point on the thermal runaway sensing member fluctuates abnormally, and the warning against thermal runaway further includes:
and when the voltage value of the monitoring point is zero, performing thermal runaway early warning.
7. The warning method for thermal runaway of a battery as claimed in claim 1, wherein at least one monitoring point is provided on each thermal runaway sensing element in the S20, and monitoring the electrical signal at each monitoring point includes:
one end of each thermal runaway sensing element is grounded, and the resistance to ground of each monitoring point is monitored by a resistance detector.
8. The method for warning thermal runaway of a battery as claimed in claim 7, wherein the step S30 of warning the thermal runaway when the thermal runaway detector is about to be fused, and the step S of performing the warning of thermal runaway when the electrical signal of at least one monitoring point on the thermal runaway detector abnormally fluctuates comprises:
and when the resistance value of at least one monitoring point on the thermal runaway sensing piece is abnormally fluctuated, performing thermal runaway early warning.
9. The battery thermal runaway early warning method according to claim 1, wherein at least one thermal runaway sensing element is arranged in a battery module in a preset routing manner at S10, the battery module comprises at least one battery cell, and each thermal runaway sensing element is in contact with a first surface of the battery cell and comprises, before the step of:
the thermal runaway sensing piece is prepared by utilizing a metal material with a preset melting point temperature, wherein the preset melting point temperature is higher than the temperature of the battery module during normal work, and the preset melting point temperature is lower than the self-heat-generation starting temperature of the battery module.
10. The battery thermal runaway early warning method of claim 1, wherein the preset routing manner is an S-shaped routing manner.
11. A computer device comprising a memory, a processor and a computer program stored on the memory and running on the processor, wherein the processor when executing the computer program implements the steps of the battery thermal runaway pre-warning method of any of claims 1 to 10.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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