Battery pack spontaneous combustion early warning circuit and vehicle

Abstract

The utility model provides a battery pack spontaneous combustion early warning circuit and a vehicle. The battery pack spontaneous combustion early warning circuit comprises a temperature detection module, an awakening module, a fire detection module, a feedback module and an MCU module. The temperature detection module is respectively connected with the wake-up module and the MCU module, and the temperature detection module is used for detecting the temperature in the battery pack; the awakening module is connected with the MCU module, and when the temperature detection module detects that the temperature is abnormal, the awakening module awakens the MCU module; the fire detection module is connected with the MCU module, and when the temperature detection module detects that the temperature is abnormal, the MCU module detects whether fire breaks out in the battery pack or not through the fire detection module; the feedback module is connected with the MCU module, and when the fire detection module detects fire, the feedback module is used for reminding a vehicle owner. The battery pack spontaneous combustion early warning circuit can detect the abnormal temperature condition in the battery pack and inform a vehicle owner, so that the use safety of the battery pack is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and particularly relates to a self-ignition warning circuit for a battery pack. The utility model also relates to a vehicle provided with the above self-ignition warning circuit for a battery pack. Background Technique

[0002] With the increasing global awareness of environmental protection and the rapid development of new energy technologies, electric vehicles, as an important alternative to traditional fuel vehicles, have seen a rapid growth in market demand and have become an important development direction in the automotive industry. However, the popularization of electric vehicles is also accompanied by a series of technical challenges, especially the safety issues of battery systems, which have become one of the key factors restricting their further development.

[0003] During the daily use of electric vehicles, the battery pack, as the core component for energy storage, its stability and safety are directly related to the safety performance of the entire vehicle. In the prior art, during charging, static state or in extreme conditions such as collision of electric vehicles, there is a risk of overheating, short circuit or even self-ignition of the battery pack. Once the battery pack catches fire, the fire often spreads rapidly. Due to the particularity of electric vehicles, the fire source is hidden, and it is often difficult for the vehicle owner to discover and take effective measures in time, resulting in the further expansion of the fire, causing immeasurable losses to the vehicle itself and the surrounding environment. In addition, electric vehicle self-ignition accidents are also accompanied by serious safety hazards. Especially in areas with dense vehicle parking or on roads, if the fire cannot be controlled in time, it will directly threaten the lives of the people in the vehicle and pedestrians around.

[0004] Although there are some electric vehicle safety monitoring systems in the existing market, most of them focus on the monitoring of vehicle driving states, and the early warning and emergency handling capabilities for extreme events such as battery pack self-ignition are still insufficient, which is not conducive to improving the use safety of the battery pack. Content of the Utility Model

[0005] In view of this, the utility model aims to propose a self-ignition warning circuit for a battery pack to improve the use safety of the battery pack.

[0006] To achieve the above object, the technical solution of the utility model is realized as follows:

[0007] A self-ignition warning circuit for a battery pack, used for self-ignition warning of the battery pack, the warning circuit includes: a temperature detection module, a wake-up module, a fire detection module, a feedback module and an MCU module;

[0008] The temperature detection module is connected to the wake-up module and the MCU module, and the temperature detection module can detect the temperature inside the battery pack. When the temperature inside the battery pack reaches the first temperature threshold, the temperature detection module sends out a wake-up signal to wake up the wake-up module;

[0009] The wake-up module is connected to the MCU module, and the wake-up module can receive the wake-up signal and send an electrical signal to wake up the MCU module;

[0010] The MCU module is respectively connected to the temperature detection module, the wake-up module, the fire detection module, and the feedback module, and the MCU module can receive the electrical signal and send a start signal to start the fire detection module;

[0011] The fire detection module can receive the start signal and detect whether there is a fire in the battery pack. If there is a fire, it will send a fire signal to the MCU module;

[0012] The MCU module can receive the fire signal and send a reminder signal to the feedback module;

[0013] The feedback module can receive the reminder signal and send a reminder signal to the vehicle owner.

[0014] Further, the temperature detection module includes a first resistor, a first thermistor, a first metal oxide semiconductor field effect transistor, a second resistor, and a comparator;

[0015] The first end of the first resistor is grounded, the second end of the first resistor is connected to the first end of the first thermistor, the second end of the first thermistor is connected to a first constant current source, the source of the first metal oxide semiconductor field effect transistor is commonly connected to the first end of the first resistor, the gate of the first metal oxide semiconductor field effect transistor is commonly connected to the second end of the first resistor, the drain of the metal oxide semiconductor field effect transistor is connected to the first end of the second resistor, the second end of the second resistor is commonly connected to the second end of the first thermistor, the negative input terminal of the comparator is commonly connected to the first end of the second resistor, the negative input terminal of the comparator is commonly connected to the second end of the second resistor, and the output terminal of the comparator is connected to the MSR1 pin of the MCU module.

[0016] Further, the wake-up module includes a power supply chip. The wake-up terminal of the power supply chip is commonly connected to the output terminal of the comparator, and the power output terminal of the power supply chip is connected to the power input terminal of the MCU module.

[0017] Further, the fire detection module includes a second metal oxide semiconductor field effect transistor, a third resistor, and a smoke detector;

[0018] The gate of the second metal-oxide semiconductor field-effect transistor is connected to the EN1 pin of the MCU module, the source of the second metal-oxide semiconductor field-effect transistor is connected to the first end of the third resistor, the drain of the second metal-oxide semiconductor field-effect transistor is connected to the first pin of the smoke detector, the second end of the third resistor is grounded, the second pin of the smoke detector is connected to the MSR2 pin of the MCU module, and the third pin of the smoke detector is connected to a second constant current source.

[0019] Further, the feedback module includes a VCU and the cloud;

[0020] The VCU is connected to the EN2 pin of the MCU module, and the VCU is connected to the cloud to transmit the fire signal detected by the MCU module to the cloud.

[0021] Further, a temperature self-verification module is also included. The temperature self-verification module is connected to the MCU module and is used to verify the working state of the temperature detection circuit.

[0022] Further, the temperature self-verification module includes a third metal-oxide semiconductor field-effect transistor, a fourth resistor, a fifth resistor, a second thermistor, an operational amplifier, a sixth resistor, a first triode, and a seventh resistor;

[0023] The gate of the third metal-oxide semiconductor field-effect transistor is connected to the EN3 pin of the MCU module, the source of the third metal-oxide semiconductor field-effect transistor is connected to the first end of the fifth resistor, the drain of the third metal-oxide semiconductor field-effect transistor is connected to the first end of the fourth resistor, the second end of the fourth resistor is connected to a second constant current source, the second end of the fifth resistor is grounded, the first end of the second thermistor is connected to the MSR3 pin of the MCU module, and the first end of the second thermistor is commonly connected to the second constant current source. The second end of the second thermistor is connected to the MSR4 pin of the MCU module. The non-inverting input terminal of the operational amplifier is commonly connected to the gate of the third metal-oxide semiconductor field-effect transistor. The inverting input terminal of the operational amplifier is connected to the emitter of the first triode. The output terminal of the operational amplifier is connected to the first end of the sixth resistor. The second end of the sixth resistor is connected to the base of the first triode. The collector of the first triode is commonly connected to the second end of the second thermistor. The first end of the seventh resistor is commonly connected to the emitter of the first triode. The second end of the seventh resistor is grounded.

[0024] Further, a fire control module is also included. The fire control circuit can turn on the fire extinguisher to control the fire.

[0025] Further, the fire control module includes a fourth metal-oxide-semiconductor field-effect transistor, an eighth resistor, and a fire extinguisher;

[0026] The gate of the fourth metal-oxide-semiconductor field-effect transistor is connected to the EN4 pin of the MCU module, the source of the fourth metal-oxide-semiconductor field-effect transistor is connected to the first end of the eighth resistor, the drain of the fourth metal-oxide-semiconductor field-effect transistor is commonly connected to the second constant current source, and the second end of the eighth resistor is grounded.

[0027] Compared with the prior art, the present utility model has the following advantages:

[0028] For the battery pack spontaneous combustion warning circuit of the present utility model, the temperature detection module can detect the temperature inside the battery pack, and the fire detection module can judge whether a fire has occurred. When the battery pack is in the sleep state, the wake-up module can wake up the MCU module so as to detect whether a fire occurs inside the battery pack in the sleep state of the battery pack. The feedback module can feedback the fire information to the vehicle owner for the vehicle owner to perform subsequent processing. Through the MCU module to mobilize and collect information, under the synergistic effect of the temperature detection module, the wake-up module, the fire detection module and the feedback module, the battery pack can be monitored in real time to achieve spontaneous combustion warning, which is beneficial to improving the use safety of the battery pack.

[0029] Based on the characteristic that the resistance value of the thermistor changes with the increase of temperature, the information of the abnormal temperature situation is converted into a level signal and output to the MCU module through the comparator, so as to accurately judge whether there is an abnormal temperature situation inside the battery pack.

[0030] The level signal output by the output terminal of the comparator wakes up the power supply chip, and the voltage output is regulated by the power supply chip, thereby waking up the MCU module, so that the fire can be detected when the temperature is abnormal inside the battery pack whether it is in the running state or the sleep state, which is beneficial to the design and implementation.

[0031] By adopting a smoke detector, in the case of abnormal temperature inside the battery pack, it can be detected by the smoke detector to judge whether a fire has occurred. If the smoke detector detects smoke, it proves that a fire has occurred, which is beneficial to the accurate judgment of the fire situation.

[0032] The fire signal is transmitted to the cloud through the VCU, so as to feedback the fire signal to the vehicle owner through the cloud, which is beneficial for the vehicle owner to perform subsequent processing.

[0033] Through the setting of the temperature self-verification module, it can verify whether the temperature detection module is working properly, and the mutual verification is beneficial to the design and implementation.

[0034] The temperature calculated through the resistance value of the second thermistor is verified with the temperature detected by the first thermistor, which can better determine whether the temperature detection circuit is operating normally, and start the fire detection module when the temperature detection module is operating normally, so as to better achieve the self-ignition warning of the battery pack.

[0035] Through the setting of the fire control module, when a self-ignition occurs in the battery pack, the fire in the battery pack can be controlled by starting the fire extinguisher.

[0036] The present utility model also proposes a vehicle, which includes a battery pack and the battery pack self-ignition warning module as described above, and the battery pack self-ignition warning module is connected to the battery pack.

[0037] The vehicle of the present utility model and the battery pack self-ignition warning module as described above have the same beneficial effects compared with the prior art, so they will not be elaborated here. Description of the Drawings

[0038] The drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0039] Figure 1 It is a schematic diagram of the composition of the battery pack self-ignition warning circuit according to the embodiment of the present utility model;

[0040] Figure 2 It is the circuit diagram of the battery pack self-ignition warning circuit according to the embodiment of the present utility model;

[0041] Description of the reference numerals:

[0042] 10. Temperature detection module; 20. Wake-up module; 30. Fire detection module; 40. Feedback module; 50. MCU module; 60. Temperature self-verification module; 70. Fire control module. Detailed Embodiments

[0043] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0044] In the description of the present utility model, it should be noted that if terms indicating the orientation or position relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present utility model. In addition, if terms such as "first", "second", etc. appear, they are also only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0045] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installation", "connection", "connection", and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in combination with specific situations.

[0046] The present utility model will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0047] Embodiment 1

[0048] This embodiment relates to a self-ignition warning circuit for a battery pack to improve the safety of using the battery pack.

[0049] In terms of the overall structure, as shown in the figure, the self-ignition warning circuit in this embodiment is used for self-ignition warning of the battery pack. The warning circuit includes: a temperature detection module 10, a wake-up module 20, a fire detection module 30, a feedback module 40, and an MCU module 50.

[0050] Among them, the temperature detection module 10 is connected to the wake-up module 20 and the MCU module 50, and the temperature detection module 10 can detect the temperature inside the battery pack. When the temperature inside the battery pack reaches the first temperature threshold, the temperature detection module 10 sends a wake-up signal to wake up the wake-up module 20. The wake-up module 20 is connected to the MCU module 50, and the wake-up module 20 can receive the wake-up signal and send an electrical signal to wake up the MCU module 50. The MCU module 50 is respectively connected to the temperature detection module 10, the wake-up module 20, the fire detection module 30, and the feedback module 40, and the MCU module 50 can receive the electrical signal and send a start signal to start the fire detection module 30. The fire detection module 30 can receive the start signal and detect whether there is a fire inside the battery pack. If there is a fire, it sends a fire signal to the MCU module 50. The MCU module 50 can receive the fire signal and send a reminder signal to the feedback module 40. The feedback module 40 can receive the reminder signal and send a reminder signal to the vehicle owner.

[0051] With the above settings, the battery pack spontaneous combustion warning circuit in this embodiment can detect the temperature inside the battery pack through the temperature detection module 10, and judge whether a fire has occurred through the fire detection module 30. When the battery pack is in the sleep state, the wake-up module 20 can wake up the MCU module 50 to detect whether a fire occurs inside the pack in the sleep state of the battery pack. The feedback module 40 can feedback the fire information to the vehicle owner for the vehicle owner to perform subsequent processing. By mobilizing and collecting information through the MCU module 50, and with the collaborative effect of the temperature detection module 10, the wake-up module 20, the fire detection module 30, and the feedback module 40, the battery pack can be monitored in real time to achieve spontaneous combustion warning, which is beneficial to improving the use safety of the battery pack.

[0052] In order to better judge whether there is an abnormal temperature situation inside the battery pack, the temperature detection module 10 of the battery pack spontaneous combustion warning circuit in this embodiment includes a first resistor R1, a first thermistor NTC1, a first metal oxide semiconductor field effect transistor QD1, a second resistor R2, and a comparator U1.

[0053] Among them, the first end of the first resistor R1 is grounded, the second end of the first resistor R1 is connected to the first end of the first thermistor NTC1, the second end of the first thermistor NTC1 is connected to the first constant current source, the source of the first metal oxide semiconductor field effect transistor QD1 is commonly connected to the first end of the first resistor R1, the gate of the first metal oxide semiconductor field effect transistor QD1 is commonly connected to the second end of the first resistor R1, the drain of the metal oxide semiconductor field effect transistor is connected to the first end of the second resistor R2, the second end of the second resistor R2 is commonly connected to the second end of the first thermistor NTC1, the negative input terminal of the comparator U1 is commonly connected to the first end of the second resistor R2, the negative input terminal of the comparator U1 is commonly connected to the second end of the second resistor R2, and the output terminal of the comparator U1 is connected to the MSR1 pin of the MCU module 50. By virtue of the characteristic that the resistance value of the thermistor changes with the increase of temperature, the information of the abnormal temperature situation is converted into a level signal and output to the MCU module 50 through the comparator U1, so as to accurately judge whether there is an abnormal temperature situation inside the battery pack. The level signal output by the comparator U1 is the wake-up signal.

[0054] Specifically, the first resistor R1 in this embodiment is a voltage-dividing resistor, the first thermistor NTC1 is a negative temperature coefficient thermistor, the resistance of the first thermistor NTC1 decreases as the temperature increases at room temperature, the first constant current source is a 12V power supply, the first metal-oxide-semiconductor field-effect transistor QD1 is an NMOS transistor, and its conduction voltage drop is greater than the voltage division of the first resistor R1 at room temperature. That is, the gate voltage drop of the first metal-oxide-semiconductor field-effect transistor QD1 is less than the conduction voltage drop at room temperature. At this time, the first metal-oxide-semiconductor field-effect transistor QD1 is in a non-conducting state. Therefore, the current flowing through the second resistor R2 is 0. At this time, the voltage at the non-inverting input terminal of the comparator U1 is equal to the voltage at the inverting input terminal, and the output terminal of the comparator U1 outputs a low level.

[0055] When the temperature inside the battery pack is abnormal and reaches the first temperature threshold, the resistance of the first thermistor NTC1 decreases. At this time, the voltage division of the first resistor R1 increases. That is, the gate voltage drop of the first metal-oxide-semiconductor field-effect transistor QD1 is greater than the conduction voltage drop. At this time, the first metal-oxide-semiconductor field-effect transistor QD1 conducts, that is, there is current in the second resistor R2. At this time, the voltage at the non-inverting input terminal of the comparator U1 is greater than the voltage at the inverting input terminal, and the comparator U1 outputs a high level.

[0056] It should be noted that the first temperature threshold in this embodiment can be set according to the specific coefficients of the thermistor.

[0057] To better wake up the MCU module 50, the wake-up module 20 of the battery pack spontaneous combustion warning circuit in this embodiment includes a power supply chip. The wake-up terminal of the power supply chip is commonly connected to the output terminal of the comparator U1. The power output terminal of the power supply chip is connected to the power input terminal of the MCU module 50. The power supply chip is woken up by the level signal output by the output terminal of the comparator U1, and the voltage output is regulated by the power supply chip, thereby waking up the MCU module 50, so that the fire detection can be performed when the temperature inside the battery pack is abnormal whether in the running or sleeping state, which is beneficial to the design and implementation. The voltage output of the wake-up module is the electrical signal for waking up the MCU module.

[0058] Specifically, when the battery pack is in the running state, the MCU module 50 can collect the output level of the comparator U1 in real time. When the battery pack is in the sleeping state, if the temperature inside the battery pack rises to the first temperature threshold, the comparator U1 outputs a high level to wake up the power supply chip, thereby waking up the MCU module 50, and the MCU module 50 can collect the output level of the comparator U1.

[0059] To more accurately determine whether a fire has occurred inside the battery pack, the fire detection module 30 of the battery pack spontaneous combustion warning circuit in this embodiment includes a second metal-oxide-semiconductor field-effect transistor QD2, a third resistor R3, and a smoke detector L1.

[0060] Among them, the gate of the second metal-oxide semiconductor field-effect transistor QD2 is connected to the EN1 pin of the MCU module 50. The source of the second metal-oxide semiconductor field-effect transistor QD2 is connected to the first end of the third resistor R3. The drain of the second metal-oxide semiconductor field-effect transistor QD2 is connected to the first pin of the smoke detector L1. The second end of the third resistor R3 is grounded. The second pin of the smoke detector L1 is connected to the MSR2 pin of the MCU module 50. The third pin of the smoke detector L1 is connected to the second constant current source. By using the smoke detector L1, in the case of abnormal temperature in the battery pack, it can be detected by the smoke detector L1 to judge whether a fire has occurred. If the smoke detector L1 detects smoke, it proves that a fire has occurred, which is conducive to the accurate judgment of the fire situation.

[0061] Specifically, when the MCU module 50 determines that the temperature in the battery pack is abnormal, the MCU module 50 outputs a high level to turn on the second metal-oxide semiconductor field-effect transistor QD2, connecting the smoke detector L1 to work in the circuit. If the smoke detector L1 detects smoke, it outputs a high level and feeds it back to the MCU module 50. Otherwise, it outputs a low level and feeds it back to the MCU module 50. Therefore, the MCU module 50 can more accurately judge whether combustion has occurred in the battery pack through the smoke detector L1. The high level output by the smoke detector L1 is the fire signal.

[0062] In order to better feedback the fire situation to the vehicle owner, the feedback module 40 of the battery pack spontaneous combustion warning module in this embodiment includes a VCU and the cloud.

[0063] Among them, the VCU is connected to the EN2 pin of the MCU module 50, and the VCU is connected to the cloud to transmit the fire signal detected by the MCU module 50 to the cloud. By transmitting the fire signal to the cloud through the VCU, the fire signal can be fed back to the vehicle owner through the cloud, which is conducive to the vehicle owner for subsequent processing.

[0064] Specifically, the MCU module 50 can transmit the fire signal to the VCU, and the VCU transmits the fire signal to the T-BOX and the cloud. The vehicle owner can receive the fire signal through the cloud, which timely warns the vehicle owner and is conducive to the vehicle owner to take corresponding measures in time. The signal transmitted through the VCU and the cloud is the reminder signal.

[0065] In order to improve the accuracy of the spontaneous combustion warning, the battery pack spontaneous combustion warning circuit in this embodiment further includes a temperature self-verification module 60. The temperature self-verification module 60 is connected to the MCU module 50 and is used to verify the working state of the temperature detection circuit. Through the setting of the temperature self-verification module 60, it can verify whether the temperature detection module 10 is working properly, mutually verifying, which is conducive to the design and implementation.

[0066] Specifically, the temperature self - verification module 60 in this embodiment includes a third metal - oxide - semiconductor field - effect transistor QD3, a fourth resistor R4, a fifth resistor R5, a second thermistor NTC2, an operational amplifier U2, a sixth resistor R6, a first triode, and a seventh resistor R7.

[0067] Among them, the gate of the third metal - oxide - semiconductor field - effect transistor QD3 is connected to the EN3 pin of the MCU module 50. The source of the third metal - oxide - semiconductor field - effect transistor QD3 is connected to the first end of the fifth resistor R5. The drain of the third metal - oxide - semiconductor field - effect transistor QD3 is connected to the first end of the fourth resistor R4. The second end of the fourth resistor R4 is connected to the second constant - current source. The second end of the fifth resistor R5 is grounded. The first end of the second thermistor NTC2 is connected to the MSR3 pin of the MCU module 50, and the first end of the second thermistor NTC2 is commonly connected to the second constant - current source. The second end of the second thermistor NTC2 is connected to the MSR4 pin of the MCU module 50. The non - inverting input terminal of the operational amplifier U2 is commonly connected to the gate of the third metal - oxide - semiconductor field - effect transistor QD3. The inverting input terminal of the operational amplifier U2 is connected to the emitter of the first triode. The output terminal of the operational amplifier U2 is connected to the first end of the sixth resistor R6. The second end of the sixth resistor R6 is connected to the base of the first triode. The collector of the first triode is commonly connected to the second end of the second thermistor NTC2. The first end of the seventh resistor R7 is commonly connected to the emitter of the first triode. The second end of the seventh resistor R7 is grounded. By calculating the temperature through the resistance value of the second thermistor NTC2 and verifying it with the temperature detected by the first thermistor NTC1, it can better judge whether the temperature detection circuit is operating normally, and start the fire - detection module 30 when the temperature detection module 10 is operating normally, thus better realizing the self - ignition warning of the battery pack.

[0068] More specifically, the second constant - current source is a 12V power supply. When the MCU module 50 collects a high - level output from the comparator U1, the MCU module 50 outputs a high - level to turn on the third metal - oxide - semiconductor field - effect transistor. At this time, the voltage at the non - inverting input terminal of the operational amplifier U2 is (12 - UQD3)* the resistance value of the fifth resistor R5 / (the resistance value of the fourth resistor R4+the resistance value of the fifth resistor R5). Therefore, the current flowing through the seventh resistor R7 and the second thermistor NTC2 is (12 - UQD3) / (the resistance value of the fourth resistor R4+the resistance value of the fifth resistor R5) / the resistance value of the seventh resistor R7. By collecting the voltage of the second thermistor NTC2 by the MCU module 50, the resistance value of the second thermistor NTC2 can be calculated, and thus the temperature inside the battery pack can be inferred according to the change of the resistance value of the second thermistor NTC2. If this temperature is also abnormal, the fire - detection module 30 intervenes to work. If this temperature continuously remains at a normal temperature, the MCU module 50 outputs a high - level to put the power supply chip into sleep mode and prompts that the temperature detection module 10 is abnormal and needs to be repaired.

[0069] To better control the fire, the battery pack spontaneous combustion warning circuit in this embodiment further includes a fire control module 70. The fire control circuit can turn on the fire extinguisher to control the fire. Through the setting of the fire control module 70, when spontaneous combustion occurs in the battery pack, the fire in the battery pack can be controlled by starting the fire extinguisher.

[0070] Specifically, the fire control module 70 in this embodiment includes a fourth metal oxide semiconductor field effect transistor QD4, an eighth resistor, and a fire extinguisher.

[0071] Among them, the gate of the fourth metal oxide semiconductor field effect transistor QD4 is connected to the EN4 pin of the MCU module 50. The source of the fourth metal oxide semiconductor field effect transistor QD4 is connected to the first end of the eighth resistor. The drain of the fourth metal oxide semiconductor field effect transistor QD4 is commonly connected to the second constant current source, and the second end of the eighth resistor is grounded.

[0072] More specifically, when the MCU module 50 determines that the temperature in the battery pack is abnormal, the MCU module 50 outputs a high level to turn on the fourth metal oxide semiconductor field effect transistor QD4, so that the fire extinguisher can be connected to the power supply and opened. The fire extinguisher selected in this embodiment is a CO2 fire extinguisher. When the fire extinguisher is activated, a large amount of CO2 gas can be released to reduce the oxygen concentration in the pack to control the fire, and the temperature in the pack can be reduced to control the fire, thus gaining time for subsequent processing.

[0073] The battery pack spontaneous combustion warning circuit of this embodiment can mobilize and collect information through the MCU module. Under the collaborative action of the temperature detection module, wake-up module, fire detection module, and feedback module, it can monitor the battery pack in real time to achieve spontaneous combustion warning, which is beneficial to improving the use safety of the battery pack. Through the setting of the temperature self-verification module, it can verify whether the temperature detection module is working properly, which is mutually confirmatory and beneficial to the design and implementation. Through the setting of the fire control module, when spontaneous combustion occurs in the battery pack, the fire in the battery pack can be controlled by starting the fire extinguisher. And it can effectively improve the use safety of the battery pack.

[0074] Embodiment Two

[0075] This embodiment relates to a vehicle, which includes a battery pack and the battery pack spontaneous combustion warning circuit in Embodiment One, and the battery pack is connected to the battery pack spontaneous combustion warning circuit.

[0076] The vehicle of this embodiment can determine whether spontaneous combustion occurs in the battery pack by configuring the battery pack spontaneous combustion warning circuit in Embodiment One, and can perform battery pack spontaneous combustion warning in the vehicle's sleep state through the battery pack spontaneous combustion warning circuit in Embodiment One, which is beneficial to improving the use safety of the battery pack, and thus beneficial to improving the use safety of the whole vehicle.

[0077] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A self-ignition warning circuit for a battery pack, used for self-ignition warning of the battery pack, characterized in that, The warning circuit includes: a temperature detection module, a wake-up module, a fire detection module, a feedback module, and an MCU module; The temperature detection module is connected to the wake-up module and the MCU module, and the temperature detection module can detect the temperature inside the battery pack. When the temperature inside the battery pack reaches the first temperature threshold, the temperature detection module sends a wake-up signal to wake up the wake-up module; The wake-up module is connected to the MCU module, and the wake-up module can receive the wake-up signal and send an electrical signal to wake up the MCU module; The MCU module is respectively connected to the temperature detection module, the wake-up module, the fire detection module, and the feedback module, and the MCU module can receive the electrical signal and send a start signal to start the fire detection module; The fire detection module can receive the start signal and detect whether there is a fire inside the battery pack. If there is a fire, it sends a fire signal to the MCU module; The MCU module can receive the fire signal and send a reminder signal to the feedback module; The feedback module can receive the reminder signal and send a reminder signal to the vehicle owner.

2. The battery pack spontaneous combustion warning circuit according to claim 1, wherein: The temperature detection module includes a first resistor, a first thermistor, a first metal oxide semiconductor field effect transistor, a second resistor, and a comparator; The first end of the first resistor is grounded, the second end of the first resistor is connected to the first end of the first thermistor, the second end of the first thermistor is connected to a first constant current source, the source of the first metal oxide semiconductor field effect transistor is commonly connected to the first end of the first resistor, the gate of the first metal oxide semiconductor field effect transistor is commonly connected to the second end of the first resistor, the drain of the metal oxide semiconductor field effect transistor is connected to the first end of the second resistor, the second end of the second resistor is commonly connected to the second end of the first thermistor, the negative input terminal of the comparator is commonly connected to the first end of the second resistor, the negative input terminal of the comparator is commonly connected to the second end of the second resistor, and the output terminal of the comparator is connected to the MSR1 pin of the MCU module.

3. The battery pack spontaneous combustion warning circuit according to claim 2, wherein: The wake-up module includes a power supply chip, the wake-up terminal of the power supply chip is commonly connected to the output terminal of the comparator, and the power output terminal of the power supply chip is connected to the power input terminal of the MCU module.

4. The battery pack spontaneous combustion warning circuit according to claim 3, wherein: The fire detection module includes a second metal oxide semiconductor field effect transistor, a third resistor, and a smoke detector; The gate of the second metal-oxide semiconductor field-effect transistor is connected to the EN1 pin of the MCU module, the source of the second metal-oxide semiconductor field-effect transistor is connected to the first end of the third resistor, the drain of the second metal-oxide semiconductor field-effect transistor is connected to the first pin of the smoke detector, the second end of the third resistor is grounded, the second pin of the smoke detector is connected to the MSR2 pin of the MCU module, and the third pin of the smoke detector is connected to a second constant current source.

5. The battery pack spontaneous combustion warning circuit according to claim 4, wherein: The feedback module includes a VCU and the cloud; The VCU is connected to the EN2 pin of the MCU module, and the VCU is connected to the cloud to transmit the fire signal detected by the MCU module to the cloud.

6. The battery pack spontaneous combustion warning circuit according to any one of claims 1-5, wherein: It further includes a temperature self-verification module, and the temperature self-verification module is connected to the MCU module for verifying the working state of the temperature detection circuit.

7. The battery pack spontaneous combustion warning circuit according to claim 6, wherein: The temperature self-verification module includes a third metal-oxide semiconductor field-effect transistor, a fourth resistor, a fifth resistor, a second thermistor, an operational amplifier, a sixth resistor, a first triode, and a seventh resistor; The gate of the third metal-oxide semiconductor field-effect transistor is connected to the EN3 pin of the MCU module, the source of the third metal-oxide semiconductor field-effect transistor is connected to the first end of the fifth resistor, the drain of the third metal-oxide semiconductor field-effect transistor is connected to the first end of the fourth resistor, the second end of the fourth resistor is connected to a second constant current source, the second end of the fifth resistor is grounded, the first end of the second thermistor is connected to the MSR3 pin of the MCU module, and the first end of the second thermistor is commonly connected to the second constant current source, the second end of the second thermistor is connected to the MSR4 pin of the MCU module, the non-inverting input terminal of the operational amplifier is commonly connected to the gate of the third metal-oxide semiconductor field-effect transistor, the negative input terminal of the operational amplifier is connected to the emitter of the first triode, the output terminal of the operational amplifier is connected to the first end of the sixth resistor, the second end of the sixth resistor is connected to the base of the first triode, the collector of the first triode is commonly connected to the second end of the second thermistor, the first end of the seventh resistor is commonly connected to the emitter of the first triode, and the second end of the seventh resistor is grounded.

8. The battery pack spontaneous combustion warning circuit according to claim 7, wherein: It further includes a fire control module, and the fire control circuit can turn on the fire extinguisher to control the fire.

9. The battery pack spontaneous combustion warning circuit according to claim 8, wherein: The fire control module includes a fourth metal-oxide semiconductor field-effect transistor, an eighth resistor, and a fire extinguisher; The gate of the fourth metal-oxide semiconductor field-effect transistor is connected to the EN4 pin of the MCU module, the source of the fourth metal-oxide semiconductor field-effect transistor is connected to the first end of the eighth resistor, the drain of the fourth metal-oxide semiconductor field-effect transistor is commonly connected to the second constant current source, and the second end of the eighth resistor is grounded.

10. A vehicle, characterized in that: It includes a battery pack and the battery pack spontaneous combustion warning circuit according to any one of claims 1-9, and the battery pack spontaneous combustion warning circuit is connected to the battery pack.

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