CN217935126U - Battery thermal runaway monitoring awakening circuit and automobile - Google Patents
Battery thermal runaway monitoring awakening circuit and automobile Download PDFInfo
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- CN217935126U CN217935126U CN202221414750.XU CN202221414750U CN217935126U CN 217935126 U CN217935126 U CN 217935126U CN 202221414750 U CN202221414750 U CN 202221414750U CN 217935126 U CN217935126 U CN 217935126U
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Abstract
The utility model discloses a battery thermal runaway monitoring wake-up circuit and an automobile, wherein the battery thermal runaway monitoring wake-up circuit comprises a temperature sensor circuit, a comparator circuit, a reference voltage circuit and an enabling circuit, the temperature sensor circuit is used for collecting the temperature signal of a battery, and the output end of the temperature sensor circuit is connected with the first input end of the comparator circuit; the reference voltage circuit generates a reference voltage of the comparator circuit, and the output end of the reference voltage circuit is connected with the second input end of the comparator circuit; the output end of the comparator circuit is connected to the awakening input end of the vehicle-mounted controller; the power supply end of the comparator circuit is connected with the output end of the enabling circuit, and the enabling circuit controls whether the comparator circuit supplies power or not according to the power-on and power-off states of the vehicle. The utility model has the advantages of: the dormant vehicle-mounted controller can be automatically awakened according to temperature data in a circuit mode, so that the vehicle-mounted controller can be awakened in time before thermal runaway; the wake-up circuit has the advantages of simple and reliable structure, convenient realization, low cost and convenient rapid popularization and use.
Description
Technical Field
The utility model relates to an automobile power battery safety monitoring field, in particular to battery thermal runaway control awakening system and car under the dormant state or under the power off state.
Background
With the development of new energy automobile industry, the requirements on the safety of power batteries are higher and higher. In the existing technical scheme, a battery management system monitors data such as cell temperature, cell voltage and insulation in real time to judge whether a power battery system triggers thermal runaway or not, and executes a corresponding thermal runaway strategy. When the controller is in a dormant or power-off state, even if the power battery system triggers a thermal runaway phenomenon, the controller cannot detect and early warn. In the prior art, a monitoring awakening system in a dormant state or a power-off state is not related to awakening a vehicle-mounted controller, so that a battery thermal runaway monitoring leak after the vehicle is flamed out is caused, and the safety of the vehicle in the next use are influenced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide a battery thermal runaway control awakening circuit and car, the mode through setting up the hardware circuit is monitored the thermal runaway and can reach the automatic awakening controller work of asking after setting for at the temperature, has accomplished the real time monitoring under the dormant state.
In order to achieve the purpose, the invention adopts the technical scheme that: a battery thermal runaway monitoring wake-up circuit comprises a temperature sensor circuit, a comparator circuit, a reference voltage circuit and an enabling circuit, wherein the temperature sensor circuit is used for collecting a temperature signal of a battery, and the output end of the temperature sensor circuit is connected with the first input end of the comparator circuit; the reference voltage circuit generates a reference voltage of the comparator circuit, and the output end of the reference voltage circuit is connected with the second input end of the comparator circuit; the output end of the comparator circuit is connected to the awakening input end of the vehicle-mounted controller; the power supply end of the comparator circuit is connected with the output end of the enabling circuit, and the enabling circuit controls whether the comparator circuit supplies power or not according to the power-on and power-off states of the vehicle.
The temperature sensor circuit comprises a temperature sensor R2, the temperature sensor R2 is connected with a system power supply, the temperature sensor R2 is arranged in the battery and used for collecting battery temperature data, and the output end of the temperature sensor R2 is connected with the first input end of the comparator circuit.
The first input terminal of the comparator circuit is grounded via a capacitor C.
The reference voltage circuit comprises resistors R3 and R5, one end of the resistors R3 and R5 is connected with a system power supply after being connected in series, the other end of the resistors R3 and R5 is grounded, and a terminal led out from a connection wire between the resistors R3 and R5 is connected to a second input end of the comparator circuit.
The comparator circuit comprises a voltage comparator U1 and a diode D1, wherein the voltage comparator U1 is provided with two input ends, an output end, a power supply end and a grounding end; two input ends of the voltage comparator are respectively connected with the temperature sensor circuit and the reference voltage circuit, the output end of the voltage comparator is connected with the anode of a diode D1, and the cathode of the diode is connected with a wake-up input terminal of the vehicle-mounted controller; the grounding end of the voltage comparator is grounded; the cathode of the diode D1 is grounded via a resistor R8.
The enabling circuit comprises a triode Q1, an emitter of the triode Q1 is connected to a system power supply, and a collector of the triode Q1 is connected to a power supply end of the comparator circuit; its base is connected to its emitter via a resistor R6; the base electrode of the triode Q1 is grounded through a resistor R7; and a base electrode leading-out terminal of the triode Q1 is connected to a cathode of the diode D2, and an anode of the diode D2 is connected to a KL15+ power line or a KL15+/ON gear pin of the vehicle-mounted controller.
The system power supply is powered by vehicle normal fire or a 12V storage battery.
The vehicle-mounted controller comprises a battery management system, a BCM and/or a VCU.
The automobile adopts the battery thermal runaway monitoring awakening circuit to awaken the vehicle-mounted controller.
The utility model has the advantages that: the dormant vehicle-mounted controller can be automatically awakened according to temperature data in a circuit mode, so that the vehicle-mounted controller can be awakened in time before thermal runaway; the wake-up circuit has simple and reliable structure, convenient realization, low cost and convenient rapid popularization and use; after the vehicle is powered on and works, the power supply is automatically cut off, and the wake-up circuit does not work; after the vehicle is powered off, the power is automatically supplied to the voltage comparator, the wake-up circuit automatically enters into work, the control is accurate, and the energy consumption is low.
Drawings
The contents of the various figures of the present specification and the labels in the figures are briefly described as follows:
fig. 1 is a schematic diagram of the circuit structure of the present invention.
Detailed Description
The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.
The wake-up circuit is used for waking up a vehicle-mounted controller, under the condition that a vehicle is powered on, the vehicle-mounted controller such as a BMS (battery management system), a VCU (video command unit) and the like can monitor the state of a power battery constantly, and an alarm notification signal is sent out in time when the vehicle is out of control; when the battery damage that the thermal runaway caused or the vehicle next door someone will cause certain safety risk, the control under the dormancy can't be accomplished to prior art, if make its energy consumption that will increase the vehicle of not sleeping for the on-vehicle controller power supply always, how the on-vehicle controller is awaken up in the realization of low-power consumption, let the on-vehicle controller carry out functions such as the warning control of thermal runaway by oneself after awakening up be suitable scheme, design a awakening circuit and awaken up on-vehicle controller based on this application, concrete scheme is as follows:
as shown in fig. 1, a battery thermal runaway monitoring and wake-up circuit includes a temperature sensor circuit, a comparator circuit, a reference voltage circuit, and an enable circuit, wherein the temperature sensor circuit is used for collecting a temperature signal of a battery, and an output end of the temperature sensor circuit is connected to a first input end of the comparator circuit; the reference voltage circuit generates a reference voltage of the comparator circuit, and the output end of the reference voltage circuit is connected with the second input end of the comparator circuit; the output end of the comparator circuit is connected to the awakening input end of the vehicle-mounted controller; the power supply end of the comparator circuit is connected with the output end of the enabling circuit, the enabling circuit is configured to control whether the comparator circuit supplies power or not according to the power-on and power-off states of the vehicle, and the power supply of the comparator circuit is disconnected after the vehicle is powered on, so that the comparator circuit is closed and does not work; when the vehicle is powered off, the comparator circuit is switched on to supply power, so that the power supply works, the thermal runaway is monitored in real time in the vehicle power-off state (the vehicle controller is in a dormant or closed state in the vehicle power-off state), and the work of the vehicle controller can be awakened.
The working principle comprises: the comparator circuit has two operating states: when the vehicle is powered on and works, the vehicle-mounted controller is in a working state, and can monitor thermal runaway and carry out protection treatment; at the moment, the comparator circuit does not work due to power failure; when a vehicle is powered off, the vehicle-mounted controller is in a dormant state, the enabling circuit can supply power for the comparator circuit, the comparator circuit works, a reference voltage and a voltage signal of the characteristic temperature collected by the temperature sensor are respectively input into two input ends of the comparator circuit, the comparator circuit compares the two input ends and outputs a wake-up signal to wake up the vehicle-mounted controller, when the voltage of the characteristic temperature sensor is greater than the reference voltage, the comparator outputs the wake-up signal to the wake-up input end of the vehicle-mounted controller, the vehicle-mounted controller is awakened to work, at the moment, the temperature is greater than the set temperature, and the vehicle-mounted controller performs corresponding control and alarm according to the temperature of the power battery. When the temperature is lower than the set threshold value, namely the voltage representing the battery temperature is lower than the reference voltage, the comparator circuit does not output the wake-up signal, and if the wake-up signal is at a high level, the comparator circuit does not output the wake-up signal and outputs a low level signal. Therefore, the vehicle-mounted controller can be awakened in time in the dormant state, the dormancy of the vehicle-mounted controller is kept when the temperature is normal, and the energy consumption can be saved because the circuit energy consumption of the whole core is very low.
As shown in fig. 1, for the specific circuit structure of each circuit module:
1. a temperature sensor circuit:
the temperature sensor circuit comprises a temperature sensor R2 and a resistor R4, wherein the temperature sensor R2 is actually a resistor which can change according to temperature change, the output voltage of the resistor is different due to the fact that the resistance value of the resistor changes according to the temperature after the resistor is electrified, so that temperature data are represented through voltage values, and the connection relationship is as follows: the power supply anode of the temperature sensor R2 is connected to a vehicle-mounted normal fire or 12V + storage battery through a current-limiting resistor R1 so as to supply power to the vehicle-mounted normal fire or 12V + storage battery, the cathode of the temperature sensor R2 is grounded through a resistor R4, a terminal is led out between the resistor R4 and the temperature sensor R2 to output a voltage signal V2 representing temperature, the led-out electronics of the terminal are connected to the non-inverting input end of a comparator circuit, the non-inverting input end of the comparator circuit is grounded through a capacitor C, and the voltage signal input into the comparator is filtered and stabilized through the capacitor C for the V2.
2. A reference voltage circuit:
the inverting input end of the comparator circuit is used for inputting a reference voltage, the reference voltage V1 is used for representing a temperature threshold, and when the voltage V2 representing the battery temperature and input by the non-inverting input end is greater than the V1 representing the temperature threshold, the controller needs to be awakened if the temperature is greater than the set temperature threshold. The reference voltage V1 is obtained by dividing the voltage of the resistors R3 and R5, one end of each resistor R3 and R5 is connected with a system power supply after being connected in series, the other end of each resistor R3 and R5 is grounded, a terminal is led out from a connection between the resistors R3 and R4 and is connected to the inverting input end of the comparator circuit, therefore, the reference voltage is input, the specific output of the reference voltage can be realized according to different resistor adjustments, and the resistors R3 and R5 are set by determining the voltage corresponding to the temperature threshold value in a calibration mode. The system power supply can be powered by a vehicle constant fire or a 12V storage battery. As shown in figure 1, one end of a resistor R3 is connected to a loop between R2 and R1, so that a system power supply after safe current limiting is introduced, the resistor R3 is connected with a resistor R5, the other end of the resistor R5 is grounded, and then a leading-out terminal on a connection wire between the resistors R3 and R5 is connected with an inverted input end of a comparator U1, so that a reference voltage V1 is input for the comparator U1.
3. Comparator circuit
The core of the comparator circuit comprises a voltage comparator U1, wherein the voltage comparator is mainly used for comparing input V1 and input V2 and then outputting a wake-up signal, and the voltage comparator U1 is provided with two input ends, an output end, a power supply end and a grounding end; the two input ends are respectively a non-inverting input end and an inverting input end, the two input ends of the voltage comparator are respectively connected with the temperature sensor circuit and the reference voltage circuit, the output end of the voltage comparator is connected with the anode of a diode D1, and the cathode of the diode is connected with the awakening input terminal of the vehicle-mounted controller; the grounding end of the voltage comparator is grounded; the cathode of the diode D1 is grounded via a resistor R8. The cathode of the diode D1 outputs a wake-up signal to the wake-up terminal of the controller.
4. Enable circuit
The enabling circuit mainly controls the power supply of the comparator U1 according to the power on and off of the vehicle, and comprises a triode Q1, the emitter of the triode Q1 is connected to a system power supply, and the collector of the triode Q1 is connected to the power supply end of the comparator circuit; its base is connected to its emitter via a resistor R6; the base electrode of the triode Q1 is grounded through a resistor R7; a base electrode leading-out terminal of the triode Q1 is connected to a cathode of the diode D2, and an anode of the diode D2 is connected to a KL15+ power line or a KL15+/ON gear pin of the vehicle-mounted controller. The system power supply can be powered by a vehicle constant fire or a 12V storage battery. The working principle is as follows: when a vehicle is powered ON, a 12V + voltage exists ON a KL15+ power line or a KL15+/ON pin of a vehicle-mounted controller, the voltage is sent to a base electrode of a transistor Q1 through a diode D2, and an emitter is also 12V + due to connected normal fire, so that the voltage of the emitter and the base electrode is 0, the triode Q1 is not conducted, and the U1 does not supply power and does not work; and when the vehicle is powered off, the KL15+ connected through the D2 is low level or has no voltage, the voltage of the base electrode and the emitter electrode is reduced through the R6, the voltage difference exists between the base electrode and the emitter electrode, the base electrode and the emitter electrode can be conducted, the U1 is powered on to work, and the U1 is powered on to work when the vehicle is powered off.
The wake-up circuit of the application is applied to the automobile to form the automobile, the automobile adopts the battery thermal runaway monitoring wake-up circuit to wake up the vehicle-mounted controller, and thermal runaway monitoring and processing under the condition of power failure can be effectively realized.
The voltage comparator U1 compares the input V2 and V1 to output a wake-up signal, where the voltage V2 is a voltage converted by the temperature sensor collected by the temperature sensor R2 and represents a real-time temperature of the battery, the reference voltage V1 is a voltage V1 converted based on a temperature threshold, the temperature threshold corresponding to the voltage V1 is a voltage at the time of temperature thermal runaway, and when V2> V1, the thermal runaway is considered, so that the voltage comparator U1 performs comparison and determination. And the power supply terminal of the comparator U1 controls the power supply thereof through the enabling circuit Q1. When the whole vehicle is powered on, the vehicle-mounted controller can automatically monitor thermal runaway, and the voltage comparator U1 does not need to work, so that as shown in fig. 1, when the whole vehicle is powered on, 12V + 12V is adopted when the anode of the diode D2 is connected to the base of the transistor Q1, the voltage is 12V, the emitter is 12V, the voltage between the base and the emitter of the transistor Q1 is 0, the transistor Q1 is not conducted, and the U1 cannot supply power and does not work; when the whole vehicle is powered off, the anode of the diode D2 has no voltage, so no voltage is input through the D2; the base electrode of the Q1 is subjected to voltage reduction through R6 after 12V + voltage to obtain base electrode voltage, meanwhile, the emitter voltage is 12V, and the voltage difference between the emitter and the base electrode can realize conduction, namely, the U1 works to monitor thermal runaway after the vehicle is powered off; when the thermal runaway happens, the output end of the U1 outputs a wake-up signal, otherwise, no wake-up signal is output, and after the wake-up signal is input into the controller, the controller starts to work, and performs the thermal runaway control according to the logic of the controller.
The utility model discloses a voltage comparator, triode, resistance, sensor, filter capacitance constitute one and are used for power battery thermal runaway to detect and the hardware circuit that the controller awakens up.
The hardware circuit has 2-way pin input and 1-way pin output. 2-path pin input, 1-path pin is connected to a power supply normal fire circuit, the other 1-path pin is connected to an ON gear ignition circuit, and 1-path output pin is connected to a controller wake-up pin.
The power supply of the voltage comparator is positively connected to the collector of the triode Q1, the emitter of the triode Q1 is connected to the normal fire, and the emitter of the triode Q1 is connected to the base through the resistor R6. The base of the triode is divided into two paths, wherein the path 1 is connected to an ON gear ignition loop through a diode D2, and the other path is grounded through a resistor R7.
One end of the resistor R1 is connected with normal fire, and the other end is respectively connected with a reference circuit consisting of a resistor R3 and a resistor R5 and a sampling circuit consisting of sensors R2 and R4 through 2 paths.
The common point of the sensor R2 and the resistor R4 is connected to the positive pole input of the voltage comparator, and the common point of the resistor R3 and the resistor R5 is connected to the negative pole input of the voltage comparator.
The output end of the voltage comparator is divided into 2 paths by the diode, 1 path is connected to the awakening pin, and the other 1 path is grounded by the resistor R8.
The reference circuit formed by the resistor R3 and the resistor R5 is grounded at the tail end, and the sampling circuit formed by the sensor R2 and the sensor R4 is grounded at the tail end. The common point of the resistor R2 and the resistor R4 in the sampling circuit is grounded through the filter capacitor C.
When the vehicle key is turned to an ON gear, the base voltage and the emitter voltage of the triode Q1 have no voltage difference, the triode Q1 is cut off at the moment, the power supply of the voltage comparator is cut off, the voltage comparator cannot work at the moment, and the comparator also has no wake-up voltage output. The thermal runaway detection and wake-up circuit is in a non-operational mode at this time.
When the key of the vehicle is turned to the OFF gear, the whole vehicle is powered OFF. The voltage of an emitter of a triode Q1 in a hardware circuit is larger than the voltage of a base electrode, the conduction is realized when the differential pressure is larger than about 0.7V, the triode Q1 is conducted, a voltage comparator starts to work, the voltage comparator compares the voltage V2 at the rear end of a sensor R2 with a reference voltage V1, and when the output of the sensor R2 is higher than a set value, the forward input voltage of the voltage comparator is higher than the reverse input voltage. The voltage comparator outputs a high level to wake up the controller. After the controller is awakened, whether the thermal runaway is really triggered or not is judged by detecting temperature, voltage and insulation information so as to reduce the probability of false alarm. When the voltage comparator outputs a high level, the ignition line and the wake-up line are connected in parallel due to the ON of the back-end controller side. When the sensor R2 is at a set critical value, the voltage V2 at the rear end of the sensor R2 is unstable, and in order to prevent the voltage comparator from being frequently in a high-low level switching state, the voltage V2 is stabilized through the filtering action of the capacitor C1. So as to achieve the purpose of stably outputting the wake-up signal by the voltage comparator.
It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.
Claims (9)
1. A battery thermal runaway monitoring wake-up circuit is characterized in that: the battery temperature detection circuit comprises a temperature sensor circuit, a comparator circuit, a reference voltage circuit and an enabling circuit, wherein the temperature sensor circuit is used for collecting a temperature signal of a battery, and the output end of the temperature sensor circuit is connected with the first input end of the comparator circuit; the reference voltage circuit generates a reference voltage of the comparator circuit, and the output end of the reference voltage circuit is connected with the second input end of the comparator circuit; the output end of the comparator circuit is connected to the awakening input end of the vehicle-mounted controller; the power supply end of the comparator circuit is connected with the output end of the enabling circuit, and the enabling circuit controls whether the comparator circuit supplies power or not according to the power-on and power-off states of the vehicle.
2. The battery thermal runaway monitoring wake-up circuit of claim 1, wherein: the temperature sensor circuit comprises a temperature sensor R2, the temperature sensor R2 is connected with a system power supply, the temperature sensor R2 is arranged in the battery and used for collecting battery temperature data, and the output end of the temperature sensor R2 is connected with the first input end of the comparator circuit.
3. The battery thermal runaway monitoring wake-up circuit of claim 2, wherein: the first input terminal of the comparator circuit is grounded via a capacitor C.
4. The battery thermal runaway monitoring wake-up circuit of claim 1, wherein: the reference voltage circuit comprises resistors R3 and R5, one end of each resistor R3 and R5 is connected with a system power supply after being connected in series, the other end of each resistor R3 and R5 is grounded, and a leading-out terminal on a connection wire between the resistors R3 and R5 is connected to a second input end of the comparator circuit.
5. The battery thermal runaway monitoring wake-up circuit of claim 1, wherein: the comparator circuit comprises a voltage comparator U1 and a diode D1, wherein the voltage comparator U1 is provided with two input ends, an output end, a power supply end and a grounding end; two input ends of the voltage comparator are respectively connected with the temperature sensor circuit and the reference voltage circuit, the output end of the voltage comparator is connected with the anode of the diode D1, and the cathode of the diode is connected with the awakening input terminal of the vehicle-mounted controller; the grounding end of the voltage comparator is grounded; the cathode of the diode D1 is grounded via a resistor R8.
6. The battery thermal runaway monitoring wake-up circuit of claim 5, wherein: the enabling circuit comprises a triode Q1, an emitter of the triode Q1 is connected to a system power supply, and a collector of the triode Q1 is connected to a power supply end of the comparator circuit; its base is connected to its emitter via a resistor R6; the base electrode of the triode Q1 is grounded through a resistor R7; and a base electrode leading-out terminal of the triode Q1 is connected to a cathode of the diode D2, and an anode of the diode D2 is connected to a KL15+ power line or a KL15+/ON gear pin of the vehicle-mounted controller.
7. The battery thermal runaway monitoring wake-up circuit of claim 2, wherein: the system power supply is powered by vehicle normal fire or a 12V storage battery.
8. The battery thermal runaway monitoring wake-up circuit of claim 1, wherein: the vehicle-mounted controller comprises a battery management system, a BCM and/or a VCU.
9. An automobile, characterized in that: the automobile adopts the battery thermal runaway monitoring and awakening circuit as claimed in any one of claims 1 to 8 to awaken the vehicle controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221414750.XU CN217935126U (en) | 2022-06-07 | 2022-06-07 | Battery thermal runaway monitoring awakening circuit and automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221414750.XU CN217935126U (en) | 2022-06-07 | 2022-06-07 | Battery thermal runaway monitoring awakening circuit and automobile |
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| Publication Number | Publication Date |
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| CN217935126U true CN217935126U (en) | 2022-11-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221414750.XU Active CN217935126U (en) | 2022-06-07 | 2022-06-07 | Battery thermal runaway monitoring awakening circuit and automobile |
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| CN (1) | CN217935126U (en) |
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- 2022-06-07 CN CN202221414750.XU patent/CN217935126U/en active Active
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Effective date of registration: 20230505 Address after: Floor 18, Building 13, Science and Technology Industrial Park, No. 717 Zhongshan South Road, Wuhu High tech Industrial Development Zone, Yijiang District, Wuhu City, Anhui Province, 241000 Patentee after: Wuhu Tairui Automobile Co.,Ltd. Address before: 241000 Building 8, science and Technology Industrial Park, 717 Zhongshan South Road, Yijiang District, Wuhu City, Anhui Province Patentee before: Chery Commercial Vehicles (Anhui) Co., Ltd. |