CN109818109B - Low-temperature protection system and protection method for power battery - Google Patents
Low-temperature protection system and protection method for power battery Download PDFInfo
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- CN109818109B CN109818109B CN201910160019.5A CN201910160019A CN109818109B CN 109818109 B CN109818109 B CN 109818109B CN 201910160019 A CN201910160019 A CN 201910160019A CN 109818109 B CN109818109 B CN 109818109B
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Abstract
The invention relates to the technical field of automobile batteries, in particular to a low-temperature protection system and a low-temperature protection method for a power battery, wherein the system comprises a temperature monitoring circuit, a control module and a heating module, wherein the temperature monitoring circuit is used for conducting when the environment temperature where the power battery is located is monitored to be lower than a first threshold value and sending a wake-up signal to the control module; the control module is used for sending a heating instruction to the heating module when receiving the awakening signal; the heating module is used for heating the power battery according to the heating instruction sent by the control module. Through the system and the method, the battery temperature can be automatically monitored, the heating module can heat the power battery at variable time, the battery temperature is always in a proper working interval in a low-temperature environment, the charging time of the battery can be directly charged and discharged, the power battery can be directly discharged when a user needs to use the vehicle, and the power output capacity of the battery is improved.
Description
Technical Field
The invention relates to the technical field of automobile batteries, in particular to a low-temperature protection system and a low-temperature protection method for a power battery.
Background
The power battery plays an important role as an energy source of the electric automobile. Most of electric automobiles on the market today adopt lithium batteries as components of power battery units. Lithium batteries, however, suffer a significant reduction in their capacity at low temperatures and can severely affect their ability and efficiency to be charged and discharged. Therefore, proper thermal management of the power battery in the electric automobile is always important in the functional requirements of the whole automobile.
In the current solution, after a vehicle is powered on and started, a processing method mainly includes taking the temperature of a battery core and the water temperature of a battery thermal management loop as input signals, substituting the input signals into a related algorithm for calculation, and correspondingly starting a heating unit to heat a power battery unit so as to enable the power battery unit to reach a proper working temperature range. Although such a method can basically ensure that the power battery reaches a proper operating temperature after the vehicle is powered on to operate (for a period of time), the disadvantage is obvious. For example, in a cold region, the vehicle after being parked overnight is already frozen to-dozens of degrees, and in an extreme case, the temperature of the power battery is very low, the power output capability of the power battery is very limited when a driver enters the vehicle to start the vehicle to run the vehicle the next day, and the power performance of the whole vehicle is seriously affected for a long time after the vehicle is started. Or when the owner prepares to mend the electricity for the vehicle, and because the battery temperature is too low, is unsuitable to directly pour into the electric energy to battery inside into, the control strategy at this moment mostly utilizes the electric energy of charging the stake side to drive the high voltage device of vehicle earlier to heat for the battery from this, when the battery temperature reaches certain threshold value, just formally pours into the electric energy into the battery inside into, the result of bringing like this is exactly, whole time of charging can be prolonged, also can directly influence user experience.
Disclosure of Invention
In order to solve the defects of long charging time and insufficient output power when the automobile power battery management system works in a low-temperature environment in the prior art, the application provides the following technical scheme:
a low-temperature protection system for power batteries comprises at least one group of power batteries, a temperature monitoring circuit, a control module and a heating module, wherein the temperature monitoring circuit and the heating module are connected with the control module;
the temperature monitoring circuit is used for conducting when the environment temperature where the power battery is located is monitored to be lower than a first threshold value, and sending a wake-up signal to the control module;
the control module is used for sending a heating instruction to the heating module when receiving the wake-up signal;
the heating module is used for heating the power battery according to the heating instruction sent by the control module.
Further, the control module is further configured to send a sleep or off instruction to the temperature monitoring circuit after receiving the wake-up signal, and control the temperature monitoring circuit to enter a sleep or off state.
The control module is internally pre-stored with heating logic, and the control module receives the wake-up signal and then sends the heating instruction to the heating module according to the heating logic.
Further, the control module is further configured to send a wake-up instruction to the temperature monitoring circuit after the heating logic is completed, so that the temperature monitoring circuit enters a monitoring state again.
The temperature monitoring circuit comprises a power supply, a fixed value resistor, a thermistor, a relay and an MOS (metal oxide semiconductor) tube; the relay, the fixed value resistor and the thermistor are sequentially connected in series at two ends of the power supply to form a voltage divider, the middle point of the voltage divider is connected with the grid electrode of the MOS tube, the drain electrode of the MOS tube is connected between the relay and the fixed value resistor, and the source electrode of the MOS tube is connected with the negative electrode of the power supply through a pull-down resistor;
the source electrode of the MOS tube is also connected with the control module;
the relay is also connected with the control module.
Wherein, the control module is a vehicle controller or an air conditioner controller.
A method of power battery system cryo-protection, the system comprising a temperature monitoring circuit and a heating module, the method comprising:
monitoring a wake-up signal output by the temperature monitoring circuit, and sending a heating instruction to the heating module to control the heating module to heat after the wake-up signal is obtained;
and sending a sleep or disconnection instruction to the temperature monitoring circuit after receiving the wake-up signal, and controlling the temperature monitoring circuit to enter a sleep or disconnection state.
Further, the method also comprises the following steps:
and after the heating module finishes heating according to the heating instruction, sending a wake-up instruction to the temperature monitoring circuit, so that the temperature monitoring circuit enters a monitoring state again.
Wherein the heating instructions are generated by pre-stored heating logic.
The temperature monitoring circuit comprises a thermistor, a power supply, a fixed value resistor, a relay and an MOS (metal oxide semiconductor) tube;
the relay, the fixed value resistor and the thermistor are sequentially connected in series to form a voltage divider at two ends of the power supply, the middle point of the voltage divider is connected with the grid electrode of the MOS tube, the drain electrode of the MOS tube is connected between the relay and the fixed value resistor, the source electrode of the MOS tube is connected with the negative electrode of the power supply through a pull-down resistor, and the source electrode of the MOS tube is further connected with a signal wire for outputting the awakening signal.
According to the power battery low-temperature protection system and the power battery low-temperature protection method, in a low-temperature environment, the temperature monitoring circuit can automatically monitor temperature information of the environment where the power battery is located, and sends the awakening signal to the control module when the temperature value is lower than the preset first threshold value, the control module controls the heating module to work to heat the environment where the power battery is located after receiving the awakening signal, meanwhile, after the control module sends the heating instruction, the control module sends the dormancy instruction to the temperature monitoring circuit to enable the temperature monitoring circuit to enter the dormancy state, so that electric energy is saved, and after the heating logic is completed, the temperature monitoring circuit sends the awakening instruction to enable the temperature monitoring circuit to enter the temperature monitoring state again. By the system and the method, the heating module can heat the power battery at variable time, so that the temperature of the battery is always in a proper working interval, the battery can be charged and discharged directly, the charging time of the battery is shortened, and the power output capacity of the battery is improved.
Drawings
FIG. 1 is a block diagram of a low-temperature protection system of a power battery according to an embodiment of the present disclosure;
FIG. 2 is a circuit diagram of a monitoring state of a temperature monitoring circuit according to an embodiment of the present invention;
FIG. 3 is a circuit diagram illustrating a sleep state of a temperature monitoring circuit according to an embodiment of the present invention;
FIG. 4 is a flowchart of a method for low-temperature protection of a power battery system according to an embodiment of the present application.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings.
The embodiment provides a power battery low-temperature protection system, as shown in fig. 1, the system includes a temperature monitoring circuit 101, a control module 102 and a heating module 103, wherein the temperature monitoring circuit 101 and the heating module 103 are both connected to the control module 102 through signal cables.
The temperature monitoring circuit 101 is configured to monitor temperature information of an environment where the power battery is located, and send an awakening signal to the control module 102 when the temperature value of the environment where the power battery is located is monitored to be lower than a preset first threshold value. For example, a temperature sensor is disposed in the temperature monitoring circuit 101, and can be used to monitor the temperature of the environment in which the battery is located. In the embodiment, the temperature of the environment where the battery is located is represented by monitoring the temperature of the cooling liquid in the thermal management loop of the power battery, and in other embodiments, the temperature of the environment where the battery is located can also be represented by measuring the temperature of the outer side wall or the inner side wall of the battery by arranging a temperature sensor on the outer side wall or the inner side wall of the power battery. In this embodiment, a liquid temperature sensor is disposed in the temperature monitoring circuit 101, and the liquid temperature sensor is disposed in the cooling liquid of the power battery thermal management loop and is used to obtain temperature information of the cooling liquid. The condition that the control module 102 is awakened is that the temperature of the environment where the power battery is located is lower than a first threshold, when the temperature of liquid in the power battery is monitored to be lower than the first threshold, the temperature monitoring circuit 101 is turned on, and an awakening signal is sent to the control module 102 to remind the control module 102 that the temperature of the environment where the power battery is located is lower than a preset first threshold, and meanwhile, the control module 102 is awakened.
The control module 102 is configured to receive a wake-up signal sent by the temperature monitoring circuit 101 in real time, send a heating instruction to the heating module 103 when the wake-up signal is obtained, and the heating module 103 is configured to heat the power battery according to the heating instruction sent by the control module 102. The heating instruction comprises information such as heating duration, heating power and the like.
It should be noted that the first threshold preset in the temperature monitoring circuit 101 is only used as a trigger condition for waking up the control module 102, when it is monitored that the ambient temperature of the battery is lower than the first threshold, the temperature monitoring circuit 101 sends a wake-up signal, so that the control module 102 is woken up, and the control module 102 does not necessarily control the heating module 103 to heat the power battery immediately after being woken up, so that the control module 102 does not necessarily send a heating instruction to the heating module 103 immediately after being woken up, and the control module 102 further analyzes the current ambient temperature of the battery according to the wake-up signal. After being awakened, the control module 102 analyzes the current ambient temperature (i.e., the first threshold), compares the first threshold with a third threshold preset in the heating logic, and sends out a heating instruction when the first threshold is lower than the third threshold. However, in general, most users will set the first threshold and the third threshold to the same value, or set the first threshold and the third threshold to be relatively close, so as to avoid the control module 102 from being woken up meaninglessly. For example, the first threshold and the third threshold are both set to-15 ℃, when the temperature monitoring circuit 101 monitors that the current ambient temperature of the battery is lower than the first threshold, the temperature monitoring circuit sends a wake-up signal to wake up the control module 102, and the control module 102 analyzes that the current ambient temperature of the battery is also lower than the third threshold according to the wake-up signal, and immediately sends a heating instruction to the heating module 103. In practical application, because the temperature value obtained by the temperature monitoring circuit 101 and the actual ambient temperature value generally have an error of about 0.5 ℃, in order to immediately control the heating module 102 to heat after the control module 102 is awakened, a technician may set the third threshold to be slightly higher than the first threshold, for example, the third threshold is higher than the first threshold by 0.5-2 ℃, for example, the first threshold is set to-15 ℃, then the third threshold is set to-14 ℃, so that when the control module 102 is awakened, the control module 102 analyzes that the current ambient temperature is the first threshold, that is, minus 15 ℃ ± 0.5 ℃, and thus, even if there is an error in measurement, the analyzed first threshold is still lower than the preset third threshold, so that the control module 102 immediately controls the heating module 103 to heat, thereby avoiding the control module 102 from being awakened meaninglessly, and saving electric energy.
Through the power battery low-temperature protection system, in a low-temperature environment, the temperature monitoring circuit 101 can automatically monitor the temperature information of the environment where the power battery is located, and send a wake-up signal to the control module 102 when the temperature value is lower than a preset first threshold value, the control module 102 controls the heating module 103 to work to heat the environment where the power battery is located after receiving the wake-up signal, so that the temperature of the battery is always in a proper working interval, when a user needs to use the vehicle, the power battery can immediately provide sufficient electric energy, and the experience of the user is improved; in addition, the temperature of the battery is always in a proper working range, so that the battery can be immediately charged when being charged, an external power supply is not needed to preheat the battery, and the charging time of the battery is shortened.
Further, the control module 102 is further configured to send a sleep or off instruction to the temperature monitoring circuit 101, and control the temperature monitoring circuit 101 to temporarily enter a sleep or off state, so that the temperature monitoring circuit 101 does not work temporarily, and electric energy is saved. In this embodiment, after receiving the wake-up signal sent by the temperature monitoring circuit 101, the control module 102 sends a sleep instruction to the temperature monitoring circuit 101, and controls the temperature monitoring circuit 101 to enter a temporary sleep state to save electric energy to the maximum extent. In other embodiments, the issuance time of the sleep command may be after the heating logic is completed or a period of time after the heating logic is completed, for example, at 30 minutes after the heating is completed, the control module 102 issues a wake-up command to the temperature monitoring circuit 101 so that the temperature monitoring circuit 101 reenters the monitoring state to continue monitoring the ambient temperature of the power battery, and issues a wake-up signal again when the temperature is lower than the first preset value. Through heating power battery place environment like this untimely for power battery's temperature is moderate and is in suitable scope, and when the user need use the car, power battery can guarantee normal electric power output, has improved user experience, perhaps when the user need charge for power battery, also need not to preheat power battery in advance, can the lug connection fill electric pile and charge, has guaranteed charge efficiency, has practiced thrift the time.
The control module 102 is pre-stored with a heating logic, a sleep logic, and the like, and may also be understood as a heating rule and a sleep rule, for example, the heating logic is a heating power of 1000W, the heating time is 5 minutes, and the sleep logic is a sleep for ten minutes. After receiving the wake-up signal, the control module 102 generates a heating instruction according to a pre-stored heating logic and sends the heating instruction to the heating module.
In other embodiments, other logic or rules are also pre-stored in the control module 102, for example, a battery temperature analysis rule is pre-stored, and after the control module 102 is awakened, the temperature information of the current battery in the environment can be analyzed according to the pre-stored battery temperature analysis rule, and the temperature information is sent to the automobile display screen for temperature display, so that a user can conveniently know the environmental temperature information of the battery.
The control module 102 may be a Vehicle Control Unit (VCU) or an air conditioning unit (HVAC), and in this embodiment, the control module 102 is the vehicle control unit VCU.
In this embodiment, the liquid temperature sensor in the temperature monitoring circuit 101 is a thermistor Rtemp. As shown in fig. 2, the temperature monitoring circuit 101 further includes a power supply E, a constant resistor Rconst, a relay and an MOS transistor MOSFET, wherein the relay, the constant resistor Rconst and the thermistor Rtemp are sequentially connected in series at two ends of the power supply E to form a voltage divider, a middle point of the voltage divider is a middle point of the constant resistor Rconst and the thermistor Rtemp, the middle point of the voltage divider is connected to a gate G of the MOS transistor MOSFET, a drain D of the MOS transistor MOSFET is connected between the relay and the constant resistor Rconst, and a source S of the MOS transistor MOSFET is connected to a negative electrode of the power supply E through a pull-down resistor rpulltown. In general, the lower the temperature, the higher the resistance of the thermistor Rtemp, the resistance of the thermistor Rtemp will vary from several kilohms to several tens of kilohms at normal temperature, and when the temperature decreases, the resistance will increase to several hundreds of kilohmsThe voltage at the middle point is lower at normal temperature, when the temperature is reduced, the resistance value of the thermistor Rtemp can be increased, the voltage at the middle point can be increased, and the voltage at the middle point is increased to the switch-on voltage V of the MOSFET of the MOS tubeGSWhen the voltage threshold value is larger than the threshold value, the MOS tube MOSFET is conducted, and the drain electrode D and the source electrode S end of the MOS tube MOSFET are conducted. The source S of the MOS transistor MOSFET is further connected to the VCU, and the wakeup pin of the VCU is connected to a 12V high level signal, that is, a wake-up signal, so that the VCU is activated and controls the heating module 103 to heat according to a preset heating logic.
The resistance values of the thermistor Rtemp and the fixed resistor Rconst are determined according to the required power and the set first threshold of the battery temperature, and generally, the resistance value of the fixed resistor Rconst is selected to be in the range of dozens of kilohms.
Furthermore, the positive electrode and the negative electrode of the power supply E are respectively connected with the KL30 pin and the GND pin of the VCU and used for supplying electric energy required by the operation to the VCU.
The heating module 103 in this embodiment is a PTC heater (thermistor heater) which is composed of a PTC ceramic heating element and an aluminum tube, and has the advantages of low thermal resistance and high heat exchange efficiency, and the control end of the PTC heater is connected to the VCU, and the coolant in the battery is heated by the control signal of the VCU, thereby heating the battery.
Further, as shown in fig. 3, an output pin OUT of the VCU is also connected to the relay by a cable, and is configured to output a control command to the relay. For example, after the VCU sends a heating instruction to the heating module 103, a sleep instruction is sent to the relay, specifically, the VCU outputs a 12V voltage signal to a circuit where an inductor L of the relay is located, so that the inductor L is turned on to generate magnetic field force, at this time, the switch S1 of the relay is sucked off, voltage values at the voltage divider and the Wakeup pin become zero, the voltage divider does not output a Wakeup signal any more, the temperature monitoring circuit 101 is temporarily in a sleep state, and electric energy of the power supply E is saved.
When the VCU monitors that the heating logic is completed, the wake-up instruction is sent to the temperature monitoring circuit 101 again, that is, the VCU stops inputting a 12V voltage signal to the inductor L, the inductor L loses attraction, and the switch S1 is automatically closed, so that the temperature monitoring circuit 101 is in the monitoring state again, for example, the preset heating logic is that, the wake-up instruction is sent to the temperature monitoring circuit 101 ten minutes after the heating logic is completed; for another example, the preset heating logic is to send a wake-up command to the temperature monitoring circuit 101 when the temperature of the environment where the battery is located is detected to be lower than the second threshold.
In the battery use, battery temperature crosses lowly can be natural causes the battery energy storage to reduce, the system that this embodiment provided can consume a small amount of electric energy, but can guarantee that battery temperature is in suitable work interval all the time, the electric energy that this system consumed can compensate basically that battery temperature reduces and the energy storage of loss, so combine to see, the system that this application provided can not cause extra electric energy loss, but can improve electric power output ability, shorten charge time, drive in cold environment for the user and bring good experience.
Example 2
The embodiment provides a method for protecting a power battery system from low temperature, wherein the system comprises a temperature monitoring circuit and a heating module, as shown in FIG. 4, and the method comprises the following steps:
step 201: monitoring a wake-up signal output by the temperature monitoring circuit 101, and sending a heating instruction to the heating module 103 to control the heating module 103 to heat after acquiring the wake-up signal;
step 202: and sending a sleep or off instruction to the temperature monitoring circuit 101 after receiving the wake-up signal, and controlling the temperature monitoring circuit 101 to enter a sleep or off state.
By the method provided by the embodiment, when the temperature of the environment where the battery is located is lower than the first threshold, the wake-up signal sent by the temperature monitoring circuit 101 is received, and after the wake-up signal is obtained, a heating instruction is sent to the heating module 103 to enable the heating module to work to heat the battery, wherein the heating duration and the heating power are determined according to a preset heating logic. Meanwhile, in order to save electric energy, the control module sends a sleep instruction to the temperature monitoring circuit 101 after receiving the wake-up signal, and controls the temperature monitoring circuit 101 to enter a sleep state.
Further, the method further comprises step 203: after the module to be heated 103 finishes heating according to the heating instruction, a wake-up instruction is sent to the temperature monitoring circuit 101, so that the temperature monitoring circuit 101 enters the monitoring state again. The temperature monitoring circuit 101 may be re-awakened to enter the monitoring state after the heating is completed or after the heating is completed and waiting for a period of time according to a preset rule or logic. The heating instruction is generated by a pre-stored heating logic or heating rule, and a technician can modify the heating logic or the heating rule according to actual conditions or environmental conditions.
As shown in fig. 2, the temperature monitoring circuit 101 includes a thermistor Rtemp, a power supply E, a constant resistor Rconst, a relay and a MOS transistor MOSFET, the relay, the constant resistor Rconst and the thermistor Rtemp are sequentially connected in series at two ends of the power supply E to form a voltage divider, the middle point of the voltage divider is connected with a gate G of the MOS transistor MOSFET, a drain D of the MOS transistor MOSFET is connected between the relay and the constant resistor Rconst, a source S of the MOS transistor MOSFET is connected with a negative electrode of the power supply E through a pull-down resistor MOSFET, the source S of the MOS transistor MOSFET is further connected with a signal line for outputting a wake-up signal, and when the wake-up signal is obtained, a heating instruction is sent to the heating module 103 to heat the battery.
The protection method in this embodiment may be implemented by a program pre-stored in the control module 102, the control module 102 may select the VCU, as shown in fig. 2, and after the VCU monitors that the heating logic is completed, the VCU sends a wake-up instruction to the temperature monitoring circuit 101 again, that is, the VCU stops inputting a 12V voltage signal to the inductor L, the inductor L loses attraction, and the switch S1 is automatically closed, so that the temperature monitoring circuit 101 is in the monitoring state again, for example, the preset heating logic is that, ten minutes after the heating logic is completed, the wake-up instruction is sent to the temperature monitoring circuit 101. For another example, when the temperature of the environment where the battery is located is detected to be lower than the second threshold, a wake-up instruction may be sent to the temperature monitoring circuit 101.
Further, the control module 102 is further connected to the relay through a signal line, as shown in fig. 3, when the VCU monitors that the heating logic is completed, the VCU sends a wake-up instruction to the temperature monitoring circuit 101 again, that is, the VCU stops inputting a 12V voltage signal to the inductor L, the inductor L loses attraction, and the switch S1 is automatically closed, so that the temperature monitoring circuit 101 is in the monitoring state again, for example, the preset heating logic is that the wake-up instruction is sent to the temperature monitoring circuit 101 ten minutes after the heating logic is completed. For another example, the preset heating logic is to send a wake-up command to the temperature monitoring circuit 101 when the temperature of the environment where the battery is located is detected to be lower than the second threshold.
Through the method of this embodiment, can monitor the ambient temperature that the battery is located automatically, untimely start-up heating module heats the battery for power battery's temperature is moderate and is in suitable scope, when the user needs the car-hour, power battery can guarantee normal electric power output, user experience has been improved, perhaps when the user needs to charge for power battery, also need not to preheat power battery in advance, can charge for electric pile by lug connection, charging efficiency has been guaranteed, time has been practiced thrift. In the time period when the battery temperature is not required to be monitored, the temperature monitoring circuit 101 is in a sleep state, and the electric energy is saved.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (9)
1. A low-temperature protection system for power batteries comprises at least one group of power batteries, and is characterized by further comprising a temperature monitoring circuit, a control module and a heating module, wherein the temperature monitoring circuit and the heating module are connected with the control module;
the temperature monitoring circuit is used for conducting when the environment temperature where the power battery is located is monitored to be lower than a first threshold value, and sending a wake-up signal to the control module;
the control module is used for sending a heating instruction to the heating module when receiving the wake-up signal;
the heating module is used for heating the power battery according to a heating instruction sent by the control module;
the control module is also used for sending a sleep or disconnection instruction to the temperature monitoring circuit after receiving the wake-up signal and controlling the temperature monitoring circuit to enter a sleep or disconnection state.
2. The power battery low-temperature protection system according to claim 1, wherein a heating logic is prestored in the control module, and the control module sends the heating instruction to the heating module according to the heating logic after receiving the wake-up signal.
3. The power battery low-temperature protection system of claim 2, wherein the control module is further configured to issue a wake-up command to the temperature monitoring circuit after the heating logic is completed, so that the temperature monitoring circuit reenters a monitoring state.
4. The power battery low-temperature protection system of any one of claims 1-3, wherein the temperature monitoring circuit comprises a power supply, a fixed-value resistor, a thermistor, a relay and an MOS (metal oxide semiconductor) tube; the relay, the fixed value resistor and the thermistor are sequentially connected in series at two ends of the power supply to form a voltage divider, the middle point of the voltage divider is connected with the grid electrode of the MOS tube, the drain electrode of the MOS tube is connected between the relay and the fixed value resistor, and the source electrode of the MOS tube is connected with the negative electrode of the power supply through a pull-down resistor;
the source electrode of the MOS tube is also connected with the control module;
the relay is also connected with the control module.
5. The power battery low-temperature protection system according to claim 1, wherein the control module is a vehicle controller or an air conditioner controller.
6. A method of power battery system cryo-protection, the system comprising a temperature monitoring circuit and a heating module, the method comprising:
monitoring a wake-up signal output by the temperature monitoring circuit, and sending a heating instruction to the heating module to control the heating module to heat after the wake-up signal is obtained;
and sending a sleep or disconnection instruction to the temperature monitoring circuit after receiving the wake-up signal, and controlling the temperature monitoring circuit to enter a sleep or disconnection state.
7. The protection method of claim 6, further comprising:
and after the heating module finishes heating according to the heating instruction, sending a wake-up instruction to the temperature monitoring circuit, so that the temperature monitoring circuit enters a monitoring state again.
8. The protection method of claim 6, wherein the heating instruction is generated by pre-stored heating logic.
9. The protection method according to claim 6, wherein the temperature monitoring circuit comprises a thermistor, a power supply source, a fixed value resistor, a relay and an MOS (metal oxide semiconductor) tube;
the relay, the fixed value resistor and the thermistor are sequentially connected in series to form a voltage divider at two ends of the power supply, the middle point of the voltage divider is connected with the grid electrode of the MOS tube, the drain electrode of the MOS tube is connected between the relay and the fixed value resistor, the source electrode of the MOS tube is connected with the negative electrode of the power supply through a pull-down resistor, and the source electrode of the MOS tube is further connected with a signal wire for outputting the awakening signal.
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| CN110474132A (en) * | 2019-09-12 | 2019-11-19 | 华霆（合肥）动力技术有限公司 | Mould group heating system, battery system and power vehicle |
| CN113067043A (en) * | 2021-03-17 | 2021-07-02 | 北京理工大学 | Remote awakening method suitable for low-temperature dormancy of battery |
| CN114243133A (en) * | 2021-05-19 | 2022-03-25 | 江苏申港锅炉有限公司 | Temperature control method and temperature control system for all-solid-state lithium battery |
| CN113904027B (en) * | 2021-08-26 | 2022-03-25 | 深圳市闪盾能源科技有限公司 | Battery charging and heating system and method |
| CN114268086B (en) * | 2021-11-29 | 2024-03-26 | 海鹰企业集团有限责任公司 | Working circuit system and method of industrial-grade chip in ultralow temperature environment |
| CN114919465B (en) * | 2022-05-12 | 2024-02-13 | 重庆大学 | Electric automobile storage device and method under high-temperature and high-cold conditions |
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| CN104377402B (en) * | 2014-12-02 | 2017-01-11 | 天津航空机电有限公司 | Control and fault diagnosing system of battery heater |
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2019
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