CN114069078B - Lithium battery thermal runaway early warning system and lithium battery system - Google Patents
Lithium battery thermal runaway early warning system and lithium battery system Download PDFInfo
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- CN114069078B CN114069078B CN202010748367.7A CN202010748367A CN114069078B CN 114069078 B CN114069078 B CN 114069078B CN 202010748367 A CN202010748367 A CN 202010748367A CN 114069078 B CN114069078 B CN 114069078B
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 102
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 102
- 238000012544 monitoring process Methods 0.000 claims description 6
- 229910000743 fusible alloy Inorganic materials 0.000 claims description 5
- 239000004020 conductor Substances 0.000 claims description 4
- 238000009434 installation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
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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
- H01M10/48—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
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to a lithium battery thermal runaway early warning system, comprising: the passive trigger module is arranged on the battery module and used for sending out an alarm electric signal when the temperature of the battery module exceeds a preset temperature; the signal processing module is connected with the passive triggering module and is used for sending out a thermal runaway early warning signal after receiving the alarm electric signal; a protection module; the early warning control module comprises an early warning unit and a control unit, wherein the early warning unit is connected with the signal processing module and is used for early warning after receiving a thermal runaway early warning signal; the control unit is connected with the protection module and is used for controlling the protection module to carry out thermal runaway protection. The lithium battery thermal runaway early warning system can effectively perform the lithium battery runaway early warning, and the control unit can control the protection module to perform thermal runaway protection so as to ensure the use safety of the lithium battery.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a lithium battery thermal runaway early warning system and a lithium battery system.
Background
The lithium battery is a main energy source of the current electric vehicle because of the characteristics of high specific energy, low self-discharge rate, long cycle life and the like. With the large-scale application of lithium batteries to electric vehicles, lithium battery safety accidents represented by thermal runaway occur, which are generally manifested as sudden rise of lithium battery temperature, smoke, fire, etc.
However, the conventional technology cannot effectively perform thermal runaway early warning on the lithium battery, so that the use safety of the lithium battery cannot be guaranteed.
Disclosure of Invention
Based on this, it is necessary to provide a lithium battery thermal runaway early warning system and a lithium battery system, which are necessary to solve the problem that the conventional technology cannot effectively perform the lithium battery thermal runaway early warning, so that the use safety of the lithium battery cannot be guaranteed.
The utility model provides a lithium cell thermal runaway early warning system for whether monitoring the lithium cell takes place thermal runaway trouble, the lithium cell includes the battery module; the lithium battery thermal runaway early warning system comprises:
The passive trigger module is arranged on the battery module and is used for sending an alarm electric signal after the temperature of the battery module exceeds a preset temperature;
the signal processing module is connected with the passive triggering module and is used for sending out a thermal runaway early warning signal after receiving the alarm electric signal;
A protection module; and
The early warning control module comprises an early warning unit and a control unit, wherein the early warning unit is connected with the signal processing module and is used for early warning after receiving the thermal runaway early warning signal; the control unit is connected with the protection module and is used for controlling the protection module to carry out thermal runaway protection.
According to the lithium battery thermal runaway early warning system, whether the temperature of the battery module in the lithium battery exceeds the preset temperature is detected by the passive trigger module, so that whether the battery module has a thermal runaway fault or not is judged, if the battery module has the thermal runaway fault, the early warning is carried out through the early warning unit in the early warning control module, so that the out-of-control early warning of the lithium battery can be effectively carried out, and the protection module can be controlled by the control unit to carry out the thermal runaway protection, so that the use safety of the lithium battery is ensured.
In one embodiment, the number of the battery modules is greater than or equal to 2, the lithium battery thermal runaway warning system further comprises positioning modules, the number of the positioning modules is the same as that of the battery modules, the positioning modules are connected with the signal processing modules, and the positioning modules are used for measuring the positions of the corresponding battery modules;
The signal processing module is also used for outputting the position of the battery module with the temperature exceeding the preset temperature to the early warning control module; the early warning unit is also used for outputting the number of the battery module with the thermal runaway fault according to the position of the battery module with the temperature exceeding the preset temperature.
In one embodiment, the passive triggering module includes:
The trigger element is opened when the temperature of the trigger element reaches the preset temperature;
and the bypass resistor is connected with the trigger element in parallel, and the resistance value of the bypass resistor is larger than a preset resistance value.
In one embodiment, the trigger element comprises a fusible alloy.
In one embodiment, the alarm electrical signal includes at least one of a current signal, a voltage signal, and a resistance signal.
In one embodiment, the trigger element comprises a thermally-sensitive conductive material.
In one embodiment, the signal processing module converts the electrical signal output by the passive triggering module into a temperature signal, judges whether the battery module has a thermal runaway fault according to the temperature signal, and if yes, outputs the thermal runaway warning signal to the warning control module.
In one embodiment, the early warning unit comprises a display, and the display performs display early warning after receiving the thermal runaway early warning signal.
In one embodiment, the control unit includes an actuation button that controls the protection module to provide thermal runaway protection upon receipt of an actuation signal.
A lithium battery system comprising a lithium battery and the lithium battery thermal runaway warning system of any one of the above.
According to the lithium battery system, whether the temperature of the battery module in the lithium battery exceeds the preset temperature or not is detected by the passive trigger module, so that whether the battery module has a thermal runaway fault or not is judged, if the thermal runaway fault occurs, the early warning is carried out through the early warning unit in the early warning control module, so that the runaway early warning of the lithium battery can be effectively carried out, and the protection module can be controlled by the control unit to carry out thermal runaway protection, so that the use safety of the lithium battery is ensured.
Drawings
Fig. 1 is a schematic diagram of a thermal runaway warning system of a lithium battery in an embodiment.
Fig. 2 is a circuit diagram of a passive trigger module in an embodiment.
Reference numerals illustrate:
100. A lithium battery pack; 110. a battery module; 210. a passive trigger module; 220. a signal processing module; 230. an early warning control module; 240. a positioning module; 211. a trigger element; 212. a shunt resistor; 213. and a wire harness.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
In the description of the present application, it should be understood that the terms "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, it will be understood that when an element is referred to as being "formed on" another element, it can be directly connected to 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. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present.
The thermal runaway early warning mode of the lithium Battery in the traditional technology comprises early warning of a Battery Management System (BMS), early warning of a point type detector and early warning of a line type detector.
The BMS early warning is carried out by acquiring voltage and temperature data of the lithium battery through a voltage acquisition line and a temperature sensor arranged in a battery pack of the lithium battery, and when the voltage and the temperature are suddenly changed (rise or fall to a set threshold point, rise or fall slope exceeds a set value and the like), the BMS controller makes thermal runaway judgment according to a preset strategy and sends out an early warning signal.
The spot detector early warning is that one or more detectors installed in a battery pack of the lithium battery monitors characteristic signals of the battery pack, sensors in the detectors can be one or more of a temperature sensor, a gas pressure sensor, a smoke sensor, a VOC sensor, a deformation sensor and the like, and when the characteristic signals are suddenly changed (rise or fall to a set threshold point, rise or fall slope exceeds a set value and the like), an independent controller makes thermal runaway judgment according to a preset strategy and sends out early warning signals.
The linear detector early warning monitors characteristic signals in the battery pack through a linear detector arranged in the battery pack of the lithium battery, and the detector can be a cable type linear heat fire detector, an air pipe type linear heat fire detector, a distributed optical fiber linear heat fire detector, a fiber bragg grating linear heat fire detector, a linear multipoint heat fire detector and other heat type fire detectors, or can be a linear light beam smoke fire detector; when the characteristic signal is suddenly changed (rises or falls to a set threshold point, the rising or falling slope exceeds a set value, etc.), the independent controller makes a thermal runaway judgment according to a preset strategy, and sends out an early warning signal.
However, for BMS early warning, when the key is powered off during parking, the BMS is in a non-working state, and the working state of the battery cannot be monitored; when a single battery cell is used for a long time in a circulating way, the fault occurs to cause voltage dip, and false alarm is easy to cause; when abnormal conditions such as system breakdown, incapability of communication and the like occur in the extreme condition of the BMS, the system is easy to fail.
For the early warning of the point-type detector, most of the sensors are influenced by the installation positions, the early warning can be quickly carried out when the sensors are close to the thermal runaway battery monomer, the early warning is delayed when the sensors are far away, and even a plurality of detectors are installed at a plurality of positions, the early warning can not be completely carried out at the first time.
For the early warning of the linear detector, the installation is complex, the requirement on levelness is high, the batch automatic installation is not possible, and the appearance is not attractive after the installation.
The lithium battery thermal runaway early warning system provided by the embodiments of the application not only can effectively perform lithium battery thermal runaway early warning, but also can overcome the problems existing in BMS early warning, point type detector early warning and line type detector early warning, thereby further ensuring the use safety of the lithium battery.
Fig. 1 is a schematic diagram of a thermal runaway warning system for a lithium battery in an embodiment. The lithium battery thermal runaway early warning system is used for monitoring whether a thermal runaway fault occurs in the lithium battery, the lithium battery comprises a battery module, the battery module can be arranged in a battery pack of the lithium battery, and the lithium battery thermal runaway early warning system can be used for specifically monitoring whether each battery module in the battery pack of the lithium battery has the thermal runaway fault.
As shown in fig. 1, the lithium battery thermal runaway warning system includes a passive trigger module 210, a signal processing module 220, a protection module (not shown), and a warning control module 230.
The passive trigger module 210 is disposed on the battery module 110. The passive triggering module 210 is used for sending out an alarm electric signal when the temperature of the battery module 110 exceeds a preset temperature.
Specifically, when the lithium battery pack 100 includes one battery module 110, the number of the passive trigger modules 210 is one, and the passive trigger modules 210 may be disposed at the upper portion, the lower portion, or the side of the battery module 110 to emit an alarm signal when the temperature of the battery module 110 exceeds a preset temperature. When the lithium battery pack 100 includes a plurality of battery modules 110, the number of the passive triggering modules 210 may be the same as the number of the battery modules 110, and each passive triggering module 210 is respectively and correspondingly disposed on one battery module 110, so as to send out an alarm signal when the temperature of the corresponding battery module 110 exceeds the preset temperature.
In this embodiment, the preset temperature may be set according to the temperature of the battery module 110 at the time of the occurrence of the thermal runaway fault. The alarm electrical signal may include, but is not limited to, one or more of an alarm voltage signal, an alarm current signal, and an alarm resistance signal.
The preset temperature is, for example, the temperature at which the battery module 110 fires, and the passive trigger module 210 sends out an alarm signal after the battery module 110 fires.
The preset temperature may further include a plurality of temperature indicators, for example, including a first preset temperature and a second preset temperature, and correspondingly, the passive triggering module 210 sends a first alarm signal when the temperature of the battery module 110 exceeds the first preset temperature, and the passive triggering module 210 sends a second alarm signal when the temperature of the battery module 110 exceeds the second preset temperature. The first preset temperature is less than the second preset temperature, the passive triggering module 210 sends out a first alarm electric signal to indicate that the battery module 110 is overheated, and the passive triggering module 210 sends out a second alarm electric signal to indicate that the battery module 110 is on fire.
The signal processing module 220 is connected with the passive triggering module 210. The signal processing module 220 is configured to send out a thermal runaway warning signal after receiving the alarm electrical signal. The signal processing module 220 may be disposed inside the lithium battery pack 100 or may be disposed outside the lithium battery pack 100. For example, the signal processing module 220 may include a controller, and when the controller detects that the voltage output by the passive triggering module 210 reaches the preset alarm voltage, the controller detects that the passive triggering module 210 outputs an alarm signal, and the controller sends a thermal runaway early warning signal to the early warning control module 230.
The early warning control module 230 includes an early warning unit and a control unit. The early warning unit is connected with the signal processing module 220, and the early warning unit is used for early warning after receiving the thermal runaway early warning signal.
Illustratively, the pre-warning unit includes a display. And the display performs display early warning after receiving the thermal runaway early warning signal so as to prompt an operator that the lithium battery has a thermal runaway fault. For example, when the lithium battery is applied to an electric vehicle, the early warning may be displayed directly on the dashboard of the electric vehicle. In other embodiments, the early warning unit may further include a voice early warning device or a light early warning device, so as to perform voice early warning or light early warning.
The control unit is connected with the protection module. The control unit is used for controlling the protection module to carry out thermal runaway protection.
Illustratively, the control unit includes a start button. The start button controls the protection module to carry out thermal runaway protection after receiving the start signal. After the early warning unit is subjected to thermal runaway early warning, an operator can enable the start button to receive a start signal by operating the start button, so that the protection module is controlled to carry out thermal runaway protection. For example, the protection module includes a cooling device to cool down the lithium battery pack 100, or a fire extinguishing device to extinguish fire of the battery module 110 in the lithium battery pack 100, etc.
The lithium battery thermal runaway early warning system detects whether the temperature of the battery module 110 in the lithium battery pack 100 exceeds the preset temperature by using the passive trigger module 210 so as to judge whether the battery module 110 has a thermal runaway fault, and if the battery module has the thermal runaway fault, the early warning is performed by using the early warning unit in the early warning control module 230, so that the lithium battery can be effectively subjected to the runaway early warning, and the protection module can be controlled by the control unit to perform the thermal runaway protection so as to ensure the use safety of the lithium battery.
In one embodiment, the number of the battery modules 110 is equal to or greater than 2. The lithium battery thermal runaway warning system also includes a positioning module 240. The number of the positioning modules 240 is the same as the number of the battery modules 110. The positioning module 240 is connected to the signal processing module 220, and the positioning module 240 is used for measuring the position of the corresponding battery module 110. The signal processing module 220 is further configured to output the position of the battery module 110 with a temperature exceeding a preset temperature to the early warning control module 230. The early warning unit is also used to output the number of the battery module 110 in which the thermal runaway fault occurs according to the position of the battery module 110 in which the temperature exceeds the preset temperature.
For example, the positioning module 240 may include a number of encoding chips equal to the number of the battery modules 110, and each encoding chip corresponds to one battery module 110 for detecting a position of the corresponding battery module 110. The signal processing module 220 obtains the position of the battery module 110 corresponding to the encoder through each encoder, thereby locking the position of the battery module 110 having a thermal runaway fault when the temperature exceeds a preset temperature. In this embodiment, each battery module 110 corresponds to a number, and the early warning unit outputs the number of the battery module 110 with the thermal runaway fault during early warning, specifically, the number of the battery module 110 may be output through a voice device or the number of the battery module 110 may be displayed through a display screen. When protection module includes fire extinguishing apparatus, can provide the basis for the subregion is put out a fire to the accurate location of battery module 110 that takes place the thermal runaway trouble, fire extinguishing apparatus can in time spray the fire extinguishing to battery module 110 that takes place the thermal runaway trouble to can further ensure the security that the lithium cell used.
In one embodiment, as shown in FIG. 2, the passive trigger module 210 includes a trigger element 211 and a shunt resistor 212. The trigger element 211 is opened when the temperature reaches a preset temperature. The shunt resistor 212 and the trigger element 211 can be connected in parallel through a wire harness 213, and the resistance value of the shunt resistor 212 is larger than a preset resistance value. The preset resistance value may be set according to an initial resistance value of the trigger element 211 such that a resistance value of the shunt resistor 212 is greater than the initial resistance value of the trigger element 211. When the temperature of the battery module 110 does not exceed the preset temperature, i.e., the normal operation state, since the resistance value of the shunt resistor 212 is large, current flows through the trigger element 211 having a small resistance; when the temperature of the battery module 110 reaches the preset temperature, i.e., a thermal runaway fault occurs, the trigger element 211 is fused by heating, i.e., in an open state, and the current forms a loop with the wire harness 213 through the shunt resistor 212, so that the electrical signal output by the passive trigger module 210 changes to reach an alarm electrical signal. For example, the early warning of thermal runaway of the lithium battery can be achieved by monitoring the changes of the electrical signals such as the voltage, the current, the resistance value and the like of the passive trigger module 210.
Illustratively, the trigger element 211 includes a fusible alloy. The fusible alloy having the melting point of the preset temperature is selected such that the fusible alloy can be quickly fused after the temperature of the battery module 110 reaches the preset temperature, thereby enabling the passive trigger module 210 to output an alarm electric signal. For example, the alarm electrical signal may include at least one of an alarm current signal, an alarm voltage signal, and an alarm resistance signal. The alarm signal is output when the electric signal output by the passive triggering module 210 reaches the preset electric signal, for example, the alarm voltage signal is output when the voltage signal output by the passive triggering module 210 reaches the preset voltage value. The signal processing module 220 only needs to determine whether the electrical signal output by the passive triggering module 210 reaches the preset electrical signal, so as to determine whether the passive triggering module 210 outputs an alarm electrical signal.
Illustratively, the trigger element 211 includes a thermally-conductive material such as a temperature sensing wire, a thermally-sensitive wire, a thermistor, or the like.
Further, the signal processing module 220 converts the electrical signal output by the passive triggering module 210 into a temperature signal. The signal processing module 220 determines whether thermal runaway occurs in the battery module 110 according to the temperature signal, and if so, outputs a thermal runaway warning signal to the warning control module 230. Specifically, when the signal processing module 220 determines that the converted temperature signal output by the passive triggering module 210 reaches the preset temperature to indicate that the battery module 110 has a thermal runaway fault, the signal processing module 220 outputs a thermal runaway warning signal to the warning control module 230 so that the warning unit performs warning. In this embodiment, the signal processing module 220 determines whether the battery module 110 corresponding to the passive triggering module 210 has a thermal runaway fault by using the converted temperature signal output by the passive triggering module 210, so as to reduce the probability of false alarm.
For example, each battery module 110 may include a plurality of battery cells, and a pair of trigger elements 211 and a bypass resistor 212 are correspondingly disposed above each battery cell, where the trigger elements 211 are opened after the temperature of the battery cell reaches a preset temperature. Each pair of trigger elements 211 in the same battery module 110 and a bypass resistor 212 connected in parallel with the trigger elements 211 are connected in series and then connected with a signal processing module 220, when the temperature of any battery cell in the battery module 110 reaches a preset temperature, the electric signals output by the passive trigger module 210 corresponding to the battery module 110 are changed, so that the passive trigger module 210 is detected to output an alarm electric signal, and thus the thermal runaway warning is performed.
In one embodiment, the lithium battery thermal runaway warning system further comprises a power supply. The power supply is connected to the passive triggering module 210, the signal processing module 220, the protection module and the early warning control module 230 for supplying power. For example, when the lithium battery is applied to an electric vehicle, the whole vehicle can be used for supplying power, the signal processing module 220 can also communicate with the BMS controller, and after the lithium battery has a thermal runaway fault, the battery management system and the passive triggering module 210 can send out a prompt for the signal processing module 220 that the thermal runaway fault occurs, so that whether the thermal runaway fault occurs in the lithium battery can not be monitored after the key is stopped, and continuous monitoring for 24 hours is realized. Or may also be powered by a backup power supply.
The lithium battery thermal runaway early warning system not only can effectively perform thermal runaway early warning so as to ensure the use safety of the lithium battery. In addition, as the whole vehicle is powered by normal electricity or by a standby power supply, the BMS is in a non-working state, and the working state of the battery can be monitored even if the key is powered off during parking; the passive triggering module 210 detects whether the battery module 110 has a thermal runaway fault, so as to avoid false alarm caused by voltage dip due to the fault when the individual battery cells are used for a long time; the early warning of the BMS is not relied on, and even if the abnormal conditions such as system breakdown, incapability of communication and the like occur under the extreme condition of the BMS, the early warning can still be normally performed. Compared with the traditional point-type detector early warning, the lithium battery thermal runaway early warning system can detect the thermal runaway fault through the trigger element 211 and the bypass resistor 212 which are connected in parallel, so that the sensor is not relied on, and the probability of false alarm can be reduced. Compared with the traditional linear detector early warning, the lithium battery thermal runaway early warning system is simple in structure, can be installed in batch automatically, and can not greatly influence the appearance of the lithium battery pack 100.
The application also provides a lithium battery system. The lithium battery system comprises a lithium battery and the lithium battery thermal runaway early warning system in any embodiment.
The above lithium battery system detects whether the temperature of the battery module 110 in the lithium battery exceeds the preset temperature by using the passive trigger module 210, so as to determine whether the battery module 110 has a thermal runaway fault, if the thermal runaway fault occurs, the early warning is performed by the early warning unit in the early warning control module 230, so that the runaway early warning of the lithium battery can be effectively performed, and the protection module can be controlled by the control unit to perform thermal runaway protection, so that the use safety of the lithium battery is ensured.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. The utility model provides a lithium cell thermal runaway early warning system for whether monitoring the lithium cell takes place thermal runaway trouble, the lithium cell includes the battery module; the lithium battery thermal runaway early warning system is characterized by comprising:
the passive trigger module is arranged on the battery module and is used for sending an alarm electric signal after the temperature of the battery module exceeds a preset temperature; the number of the battery modules is more than or equal to 2; the passive triggering module comprises a triggering element and a bypass resistor, and the triggering element is opened when the temperature reaches the preset temperature; the resistance value of the bypass resistor is larger than the initial resistance value of the trigger element; each battery module can comprise a plurality of battery cells, a pair of trigger elements and bypass resistors are correspondingly arranged above each battery cell, and each pair of trigger elements in the same battery module is connected in series with the bypass resistor connected with the trigger element in parallel;
the signal processing module is connected with the passive triggering module and is used for sending out a thermal runaway early warning signal after receiving the alarm electric signal;
A protection module; and
The early warning control module comprises an early warning unit and a control unit, wherein the early warning unit is connected with the signal processing module and is used for early warning after receiving the thermal runaway early warning signal; the control unit is connected with the protection module and is used for controlling the protection module to perform thermal runaway protection;
The lithium battery thermal runaway early warning system further comprises: the number of the positioning modules is the same as that of the battery modules, the positioning modules are connected with the signal processing modules, and the positioning modules are used for measuring the positions of the corresponding battery modules; the positioning module comprises coding chips, and each coding chip corresponds to one battery module and is used for detecting the position of the corresponding battery module.
2. The lithium battery thermal runaway warning system of claim 1, wherein the signal processing module is further configured to output a position of a battery module having a temperature exceeding the preset temperature to the warning control module; the early warning unit is also used for outputting the number of the battery module with the thermal runaway fault according to the position of the battery module with the temperature exceeding the preset temperature.
3. The lithium battery thermal runaway warning system of claim 1, wherein the trigger element comprises a fusible alloy.
4. A lithium battery thermal runaway warning system according to claim 3, characterized in that said alarm electrical signal comprises at least one of an alarm current signal, an alarm voltage signal and an alarm resistance signal.
5. The lithium battery thermal runaway warning system of claim 1, wherein the trigger element comprises a thermally sensitive conductive material.
6. The lithium battery thermal runaway warning system of claim 5, wherein the thermally-sensitive conductive material comprises any one of a temperature sensing wire, a thermally-sensitive wire, and a thermistor.
7. The lithium battery thermal runaway warning system according to claim 5, wherein the signal processing module converts an electrical signal output by the passive triggering module into a temperature signal, judges whether the battery module has a thermal runaway fault according to the temperature signal, and if so, outputs the thermal runaway warning signal to the warning control module.
8. The lithium battery thermal runaway warning system of claim 1, wherein the warning unit comprises a display that displays a warning after receiving the thermal runaway warning signal.
9. The lithium battery thermal runaway warning system of claim 1, wherein the control unit includes a start button that controls the protection module to perform thermal runaway protection upon receipt of a start signal.
10. A lithium battery system comprising a lithium battery and the lithium battery thermal runaway warning system according to any one of claims 1 to 9.
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| CN202010748367.7A CN114069078B (en) | 2020-07-30 | 2020-07-30 | Lithium battery thermal runaway early warning system and lithium battery system |
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