CN114069078A - 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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- CN114069078A CN114069078A CN202010748367.7A CN202010748367A CN114069078A CN 114069078 A CN114069078 A CN 114069078A CN 202010748367 A CN202010748367 A CN 202010748367A CN 114069078 A CN114069078 A CN 114069078A
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 103
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 103
- 238000012545 processing Methods 0.000 claims abstract description 32
- 229910000743 fusible alloy Inorganic materials 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 5
- 239000004020 conductor Substances 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000012855 volatile organic compound Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—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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Abstract
The invention relates to a lithium battery thermal runaway early warning system, which comprises: the passive trigger module is arranged on the battery module and used for sending out 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; the early warning control module comprises an early warning unit and a control unit, the early warning unit is connected with the signal processing module, and the early warning unit is used for carrying out 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 perform thermal runaway protection. The lithium battery thermal runaway early warning system can effectively perform runaway early warning on the lithium battery, and can control the protection module to perform thermal runaway protection through the control unit 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 sometimes, and the thermal runaway accidents are usually expressed as sudden temperature rise, smoke generation, fire generation and the like of the lithium batteries.
However, the conventional technology cannot effectively perform the thermal runaway early warning of the lithium battery, so that the use safety of the lithium battery cannot be ensured.
Disclosure of Invention
Based on this, it is necessary to provide a lithium battery thermal runaway early warning system and a lithium battery system aiming at the problem that the safety of the use of the lithium battery cannot be ensured because the lithium battery thermal runaway early warning cannot be effectively carried out by the conventional technology.
A lithium battery thermal runaway early warning system is used for monitoring whether a lithium battery has a thermal runaway fault or not, and the lithium battery comprises a battery module; lithium cell thermal runaway early warning system includes:
the passive trigger module is arranged on the battery module and used for sending out 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, the early warning unit is connected with the signal processing module, and the early warning unit is used for carrying out early warning after receiving the thermal runaway early warning signal; the control unit is connected with the protection module and used for controlling the protection module to perform thermal runaway protection.
The lithium battery thermal runaway early warning system utilizes the passive trigger module to detect whether the temperature of the battery module in the lithium battery exceeds the preset temperature or not so as to judge whether the thermal runaway fault occurs in the battery module, and 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 control unit controls the protection module to carry out thermal runaway protection so as to ensure the use safety of the lithium battery.
In one embodiment, the number of the battery modules is greater than or equal to 2, the lithium battery thermal runaway early 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 module, 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 serial 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 greater than a preset resistance value.
In one embodiment, the trigger element comprises a fusible alloy.
In one embodiment, the alarm electrical signal comprises 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, determines whether the battery module has a thermal runaway fault according to the temperature signal, and outputs the thermal runaway early warning signal to the early warning control module if the battery module has the thermal runaway fault.
In one embodiment, the early warning unit includes a display, and the display displays an early warning after receiving the thermal runaway early warning signal.
In one embodiment, the control unit includes a start button, and the start button controls the protection module to perform thermal runaway protection after receiving a start signal.
A lithium battery system comprises a lithium battery and the lithium battery thermal runaway early warning system.
The lithium battery system utilizes the passive trigger module to detect whether the temperature of the battery module in the lithium battery exceeds the preset temperature or not so as to judge whether the battery module has a thermal runaway fault or not, and 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 control unit controls the protection module to carry out thermal runaway protection so as to ensure the use safety of the lithium battery.
Drawings
Fig. 1 is a schematic diagram of a thermal runaway early warning system of a lithium battery in an embodiment.
Fig. 2 is a circuit diagram of a passive triggering module according to an embodiment.
Description of reference numerals:
100. a lithium battery pack; 110. a battery module; 210. a passive triggering module; 220. a signal processing module; 230. an early warning control module; 240. a positioning module; 211. a trigger element; 212. a bypass resistor; 213. a wire harness.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In the description of the present application, it is to 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 those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application. Further, 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 method of the lithium Battery in the traditional technology comprises Battery Management System (BMS) early warning, point-type detector early warning and linear detector early warning.
The BMS early warning system comprises a BMS controller and a temperature sensor, wherein the BMS early warning system collects voltage and temperature data of a lithium battery through a voltage collecting line and the temperature sensor which are arranged in a battery pack of the lithium battery, and when the voltage and the temperature are suddenly changed (increased or decreased to a set threshold point, increased or decreased slope exceeding 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 point-type detector early warning monitors the characteristic signals of the battery pack through one or more detectors installed in the battery pack of the lithium battery, the sensors in the detectors can be one or more combinations of sensors such as a temperature sensor, a gas pressure sensor, a smoke sensor, a VOC (volatile organic compound) sensor and a deformation sensor, when the characteristic signals are suddenly changed (increased or decreased to a set threshold point, increased or decreased slope exceeding 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 a battery pack through a linear detector installed in the battery pack of the lithium battery, and the detector can be a cable type linear temperature-sensing fire detector, an air pipe type linear temperature-sensing fire detector, a distributed optical fiber linear temperature-sensing fire detector, an optical fiber grating linear temperature-sensing fire detector, a linear multipoint temperature-sensing fire detector and other temperature-sensing fire detectors, and can also be a linear beam smoke-sensing fire detector; when the characteristic signal is suddenly changed (the characteristic signal is increased or decreased to a set threshold point, the rising or falling slope exceeds a set value and the like), an independent controller makes thermal runaway judgment according to a preset strategy and sends out an early warning signal.
However, for BMS warning, when the key is turned off during parking, the BMS is in an inoperative state and cannot monitor the operating state of the battery; when individual battery monomer fails after long-time cycle use, voltage drop is caused, and false alarm is easy to cause; when the BMS is in an extreme condition, the system is easy to fail when the system is crashed, the communication cannot be carried out and the like.
For the early warning of the point type detector, most sensors are influenced by the installation position, can give an alarm quickly when being close to the thermal runaway battery monomer, and give an alarm when being far away, so that the alarm is delayed, and even if a plurality of detectors are installed at a plurality of positions, the alarm can not be prepared at the first time completely.
For the early warning of the linear detector, the installation is complex, the requirement on levelness is high, the automatic installation in batches cannot be realized, and the appearance is not attractive after the installation.
The lithium battery thermal runaway early warning system provided by each embodiment of the application can effectively perform lithium battery thermal runaway early warning, and can overcome the problems existing in BMS early warning, point type detector early warning and linear type detector early warning, so that the use safety of the lithium battery is further ensured.
Fig. 1 is a thermal runaway early warning system for a lithium battery in an embodiment. Lithium cell thermal runaway early warning system is used for monitoring whether the lithium cell takes place the thermal runaway trouble, and the lithium cell includes the battery module, and the battery module can set up in the battery package of lithium cell, and lithium cell thermal runaway early warning system specifically can monitor whether each battery module takes place the thermal runaway trouble in the battery package of lithium cell.
As shown in fig. 1, the warning system for thermal runaway of lithium battery includes a passive triggering module 210, a signal processing module 220, a protection module (not shown), and a warning control module 230.
The passive triggering module 210 is disposed on the battery module 110. The passive triggering module 210 is configured to send an alarm electrical signal after 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 on the upper portion, the lower portion, or the side of the battery module 110, so as to send out an alarm electrical 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 trigger modules 210 may be the same as the number of the battery modules 110, and each passive trigger module 210 is correspondingly disposed on one battery module 110, so as to send out an alarm electrical signal when the temperature of the corresponding battery module 110 exceeds a preset temperature.
In this embodiment, the preset temperature may be set according to the temperature of the battery module 110 when the thermal runaway fault occurs. 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.
For example, the preset temperature is a temperature when the battery module 110 is on fire, and the passive trigger module 210 sends an alarm electrical signal after the battery module 110 is on fire.
For example, the preset temperature may further include a plurality of temperature indexes, for example, a first preset temperature and a second preset temperature, and correspondingly, when the temperature of the battery module 110 exceeds the first preset temperature, the passive trigger module 210 sends a first alarm electrical signal, and when the temperature of the battery module 110 exceeds the second preset temperature, the passive trigger module 210 sends a second alarm electrical signal. The first preset temperature is lower than the second preset temperature, the passive trigger module 210 sends out a first alarm electrical signal to indicate that the battery module 110 is overheated, and the passive trigger module 210 sends out a second alarm electrical signal to indicate that the battery module 110 is on fire.
The signal processing module 220 is connected to the passive triggering module 210. The signal processing module 220 is configured to send a thermal runaway early warning signal after receiving the alarm electrical signal. The signal processing module 220 may be disposed inside the lithium battery pack 100 or 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 a preset alarm voltage, that is, it detects that the passive triggering module 210 outputs an alarm electrical signal, 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 early warning unit includes a display. The display displays and warns after receiving the thermal runaway early warning signal 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 can be directly displayed on an instrument panel 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 perform thermal runaway protection.
Illustratively, the control unit includes a start button. And the starting button controls the protection module to perform thermal runaway protection after receiving the starting signal. After the early warning unit performs the thermal runaway early warning, an operator can operate the starting button to enable the starting button to receive a starting signal, so that the protection module is controlled to perform the thermal runaway protection. For example, the protection module includes a cooling device to cool down the lithium battery pack 100, or the protection module includes a fire extinguishing device to extinguish a fire of the battery module 110 in the lithium battery pack 100, or the like.
The above-mentioned lithium battery thermal runaway early warning system utilizes passive trigger module 210 to detect whether the temperature of battery module 110 exceeds the preset temperature in lithium battery pack 100 and thereby judges whether thermal runaway trouble takes place for battery module 110, if thermal runaway trouble takes place then early warning is carried out through the early warning unit in early warning control module 230 to can effectively carry out the early warning of out of control of lithium cell, thereby can carry out thermal runaway protection and guarantee the safe in utilization of lithium cell through the control unit control protection module.
In one embodiment, the number of the battery modules 110 is greater than or equal to 2. The lithium battery thermal runaway early warning system further comprises 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 the temperature exceeding the preset temperature to the early warning control module 230. The early warning unit is also used for outputting the serial number of the battery module 110 with the thermal runaway fault according to the position of the battery module 110 with the temperature exceeding the preset temperature.
For example, the positioning module 240 may include coding chips, the number of which is the same as the number of the battery modules 110, and each coding chip corresponds to one battery module 110 for detecting the position of the corresponding battery module 110. The signal processing module 220 obtains the position of the battery module 110 corresponding to each encoder through each encoder, so as to lock the position of the battery module 110 at which the thermal runaway fault occurs when the temperature exceeds the preset temperature. In this embodiment, each battery module 110 corresponds to a serial number, and the early warning unit also outputs the serial number of the battery module 110 with the thermal runaway fault when performing early warning, and specifically may output the serial number of the battery module 110 through a voice device or display the serial number of the battery module 110 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 the battery module 110 that takes place the thermal runaway trouble, and fire-extinguishing apparatus can in time spray to the battery module 110 that takes place the thermal runaway trouble and put out a fire 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 temperature of the trigger element 211 reaches a preset temperature and opens. The shunt resistor 212 and the trigger element 211 can be connected in parallel through a wiring 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 the resistance value of the shunt resistance 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, the current flows through the trigger element 211 with a smaller resistance because the resistance value of the bypass resistor 212 is larger; when the temperature of the battery module 110 reaches a preset temperature, that is, a thermal runaway fault occurs, the trigger element 211 is heated and fused, that is, is in an open circuit state, a current forms a loop with the wire harness 213 through the bypass resistor 212, and an electrical signal output by the passive trigger module 210 changes so as to reach an alarm electrical signal. For example, the lithium battery thermal runaway early warning can be realized by monitoring the change of electrical signals such as voltage, current, resistance value, and the like of the passive trigger module 210.
Illustratively, the trigger element 211 comprises a fusible alloy. The fusible alloy having the melting point at the preset temperature is selected so that the fusible alloy can be rapidly fused after the temperature of the battery module 110 reaches the preset temperature, thereby enabling the passive trigger module 210 to output the alarm electrical 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 electrical signal output by the passive trigger module 210 reaches a preset electrical signal, for example, the alarm voltage signal is output when the voltage signal output by the passive trigger module 210 reaches a 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, and can determine whether the passive triggering module 210 outputs the alarm electrical signal.
Illustratively, the trigger element 211 includes a thermally conductive material such as a temperature sensing wire, a thermally conductive 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 a thermal runaway occurs in the battery module 110 according to the temperature signal, and outputs a thermal runaway warning signal to the warning control module 230 if the thermal runaway occurs. Specifically, when the signal processing module 220 determines that the converted temperature signal output by the passive trigger module 210 reaches the preset temperature, which indicates that the battery module 110 has a thermal runaway fault, the signal processing module 220 outputs a thermal runaway early warning signal to the early warning control module 230, so that the early warning unit performs early warning. In this embodiment, the signal processing module 220 determines whether the thermal runaway fault occurs in the battery module 110 corresponding to the passive trigger module 210 through the converted temperature signal output by the passive trigger module 210, so as to reduce the probability of false alarm, and in this embodiment, a temperature sensor is not needed for temperature measurement, thereby avoiding the need to maintain the lithium battery thermal runaway early warning system frequently due to the defect of short service life of the sensor, and the operation is stable and the cost is low.
For example, each battery module 110 may include a plurality of battery cells, a pair of trigger elements 211 and a bypass resistor 212 are correspondingly disposed above each battery cell, and the trigger elements 211 open circuits when the temperature of the battery cell reaches a preset temperature. Each pair of trigger elements 211 in the same battery module 110 and the shunt resistor 212 connected in parallel with the trigger elements 211 are connected in series and then connected to the signal processing module 220, and when the temperature of any single battery in the battery module 110 reaches a preset temperature, an electrical signal output by the passive trigger module 210 corresponding to the battery module 110 changes, so that the passive trigger module 210 is detected to output an alarm electrical signal, and thus, a thermal runaway early warning is performed.
In an embodiment, the lithium battery thermal runaway early 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 cell is applied to electric vehicle, can utilize whole car ordinary electricity to provide the power, signal processing module 220 can also communicate with the BMS controller, and battery management system and passive trigger module 210 can both send the suggestion that takes place the thermal runaway trouble for signal processing module 220 after the thermal runaway trouble takes place in the lithium cell for avoid can't monitor the lithium cell behind the key electricity of parking outage and whether take place the thermal runaway trouble, thereby realize 24 hours incessant monitoring. Or may be powered by a backup power supply.
The lithium battery thermal runaway early warning system can effectively perform thermal runaway early warning to ensure the use safety of the lithium battery. In addition, as the whole vehicle is powered by normal electricity or a standby power supply is adopted, the BMS is in a non-working state, and the working state of the battery can be monitored even after the vehicle is stopped and the key is powered off; whether the battery module 110 has a thermal runaway fault is detected through the passive trigger module 210, so that false alarm caused by voltage drop due to faults after a single battery cell is recycled for a long time is avoided; the warning of the BMS can be independent, and even if the BMS is in an extreme condition and abnormal conditions such as system breakdown and communication incapability occur, normal warning can still be achieved. 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 depended on, and the false alarm probability can be reduced. Compare in traditional line type detector early warning, lithium cell thermal runaway early warning system simple structure can carry out automatic installation in batches, also can not produce very big influence to the pleasing to the eye of lithium cell package 100 appearance.
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 one of the embodiments.
The lithium battery system detects whether the temperature of the battery module 110 in the lithium battery exceeds the preset temperature by utilizing the passive trigger module 210, thereby judging whether the battery module 110 has a thermal runaway fault, and if the thermal runaway fault occurs, early warning is carried out through the early warning unit in the early warning control module 230, so that the runaway early warning of the lithium battery can be effectively carried out, and the control unit controls the protection module to carry out thermal runaway protection, thereby ensuring the use safety of the lithium battery.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A lithium battery thermal runaway early warning system is used for monitoring whether a lithium battery has a thermal runaway fault or not, and the lithium battery comprises a 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 used for sending out 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, the early warning unit is connected with the signal processing module, and the early warning unit is used for carrying out early warning after receiving the thermal runaway early warning signal; the control unit is connected with the protection module and used for controlling the protection module to perform thermal runaway protection.
2. The lithium battery thermal runaway early warning system of claim 1, wherein the number of the battery modules is greater than or equal to 2, the lithium battery thermal runaway early warning system further comprises positioning modules, the number of the positioning modules is the same as the number of the battery modules, the positioning modules are connected with the signal processing module, 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 serial 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 early warning system of claim 1, wherein the passive trigger module comprises:
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 greater than a preset resistance value.
4. The lithium battery thermal runaway warning system of claim 3, wherein the trigger element comprises a fusible alloy.
5. The lithium battery thermal runaway pre-warning system of claim 4, wherein the alarm electrical signal comprises at least one of an alarm current signal, an alarm voltage signal, and an alarm resistance signal.
6. The lithium battery thermal runaway pre-warning system of claim 3, wherein the trigger element comprises a thermally sensitive conductive material.
7. The lithium battery thermal runaway early warning system of claim 6, wherein the signal processing module converts the electrical signal output by the passive trigger module into a temperature signal, determines whether a thermal runaway fault occurs in the battery module according to the temperature signal, and outputs the thermal runaway early warning signal to the early warning control module if the thermal runaway fault occurs in the battery module.
8. The lithium battery thermal runaway early warning system of claim 1, wherein the early warning unit comprises a display, and the display displays an early warning after receiving the thermal runaway early warning signal.
9. The lithium battery thermal runaway early warning system of claim 1, wherein the control unit comprises a start button, and the start button controls the protection module to perform thermal runaway protection after receiving a start signal.
10. A lithium battery system comprising a lithium battery and the lithium battery thermal runaway warning system as claimed in 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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| 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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| CN114750633A (en) * | 2022-05-06 | 2022-07-15 | 深圳市道通合创新能源有限公司 | Charging management method, control device, charging pile and charging system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114639882A (en) * | 2022-03-07 | 2022-06-17 | 广州鹏辉能源科技股份有限公司 | Battery package thermal runaway protection system |
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