CN116766936A

CN116766936A - Method and device for rapidly relieving thermal runaway consequences of power battery

Info

Publication number: CN116766936A
Application number: CN202310574472.7A
Authority: CN
Inventors: 谢迪凡
Original assignee: Jiangyin Huilong Electric Heating Appliance Co ltd
Current assignee: Jiangyin Huilong Electric Heating Appliance Co ltd
Priority date: 2023-05-19
Filing date: 2023-05-19
Publication date: 2023-09-19

Abstract

The invention discloses a method and a device for rapidly relieving the thermal runaway result of a power battery, which are used for a new energy automobile provided with an electric heater in a cooling liquid circulation system, wherein the method at least comprises the following steps: receiving a power battery thermal event triggering alarm signal; judging the running state of the cooling liquid circulating system, and when at least one circulating route in the cooling liquid circulating system runs normally, forcedly starting the electric heater to work so as to release the residual electric quantity in the power battery in a working mode of quickly consuming the thermal power. By adopting the technical scheme disclosed by the invention, the thermal runaway effect can be quickly lightened, so that the risk caused by the thermal runaway of the power battery, the thermal diffusion and even the complete combustion of the whole vehicle is reduced, and more abundant escape time is reserved for passengers. In addition, the parts of the new energy automobile are not required to be improved or hardware equipment is not required to be additionally arranged, the use is convenient, and the application range is wide.

Description

Method and device for rapidly relieving thermal runaway consequences of power battery

Technical Field

The invention relates to the technical field of new energy automobile energy management, in particular to a method and a device for rapidly reducing the thermal runaway result of a power battery.

Background

With the rapid increase of the conservation rate of the new energy automobile, the fire accident rate caused by the power battery of the new energy automobile is also rising year by year, and the safety problem of the new energy automobile is particularly remarkable. In order to reduce the thermal runaway of the power battery, the requirements of battery single body and module safety are optimized, and meanwhile, the requirements of battery system safety, mechanical safety, electrical safety and functional safety are further emphasized.

At present, the requirement for a thermal runaway expansion safety event of a new energy automobile is that after a battery monomer is in thermal runaway, a battery system does not fire or explode within 5 minutes, and safe escape time is reserved for passengers. Therefore, in the prior art, engineering improvement and optimization are mainly performed starting from the power battery itself, the related electric control unit and the parts adjacent to the energy management parts, such as delaying the thermal runaway of the single battery cell in the electrochemical field and improving the enhanced heat insulation of the chassis and the fireproof parts in the mechanical field. However, the thermal runaway control method adopted in the prior art needs to improve the parts of the new energy automobile, and the specifications of the parts of different new energy automobiles are different, so that the unified improvement and optimization are difficult to implement. Furthermore, the existing thermal runaway control method cannot quickly alleviate the thermal runaway consequences, and cannot reserve more escape time for passengers.

In view of the foregoing, it is necessary to design a method and a device for rapidly reducing the thermal runaway of the power battery, so as to reduce the risk of thermal runaway, thermal diffusion and even complete combustion of the power battery, and reserve more abundant escape time for passengers. In addition, the parts of the new energy automobile are not required to be improved or hardware equipment is not required to be additionally arranged, the use is convenient, and the application range is wide.

Disclosure of Invention

The invention aims to provide a method and a device for rapidly relieving the thermal runaway result of a power battery, which are used for solving the problems that the thermal runaway control method in the prior art is difficult to uniformly implement and cannot rapidly relieve the result, so that the risk caused by the thermal runaway and thermal diffusion of the power battery and even the complete combustion of the whole vehicle is reduced, and more abundant escape time is reserved for passengers.

In order to achieve the above object, the present invention provides a method for rapidly reducing the thermal runaway of a power battery, for a new energy automobile provided with an electric heater in a coolant circulation system, the method at least comprising the following steps:

receiving a power battery thermal event triggering alarm signal;

judging the running state of the cooling liquid circulating system, and when at least one circulating route in the cooling liquid circulating system runs normally, forcedly starting the electric heater to work so as to release the residual electric quantity in the power battery in a working mode of quickly consuming the thermal power.

By adopting the technical scheme disclosed by the invention, the thermal runaway effect can be quickly lightened, so that the risk caused by the thermal runaway of the power battery, the thermal diffusion and even the complete combustion of the whole vehicle is reduced, and more abundant escape time is reserved for passengers. In addition, the parts of the new energy automobile are not required to be improved or hardware equipment is not required to be additionally arranged, the use is convenient, and the application range is wide.

According to the method for rapidly relieving the thermal runaway effect of the power battery, the cooling function of the vehicle-mounted cooling air conditioning equipment in the cooling liquid circulation system is forcibly started while the electric heater is forcibly started to work.

The method for rapidly reducing the thermal runaway result of the power battery comprises the step of forcibly starting the electric heater to work, and further comprises the following steps:

judging the temperature in the vehicle cabin, when the temperature in the vehicle cabin is lower than a set temperature value, forcedly starting an IGBT unit of the electric heater, and increasing the output power of the IGBT unit to the maximum level by level; wherein the set temperature is the highest temperature of the calibratable value.

The method for rapidly reducing the thermal runaway result of the power battery further comprises the step of adjusting the opening of the IGBT through the inlet and outlet water temperature sensor.

According to the method for rapidly relieving the thermal runaway effect of the power battery, when the electric heater is forcedly started to work, the working mode of the electric heater is a temporary sacrificial power output mode in which the real-time power output is far greater than the rated output power value.

The control of triggering and/or closing the forced starting electric heater is realized by the program control of the electric heater electric control unit and/or the vehicle-mounted heat management electric control unit of the new energy automobile, and the control of triggering and/or closing the cooling function of the forced starting vehicle-mounted cooling air conditioning equipment is realized by the program control of the vehicle-mounted cooling air conditioning equipment electric control unit and/or the vehicle-mounted heat management electric control unit of the new energy automobile.

The method for rapidly reducing the thermal runaway result of the power battery further comprises the following steps: a step of improving the comfort of the passengers who have not escaped under the premise of ensuring the safety is provided.

In the method for rapidly reducing the thermal runaway of the power battery, if the new energy automobile is a hybrid power automobile, the heat generated by the electric heater and/or the vehicle-mounted cooling air conditioning equipment is transmitted to an engine or a fuel cell reactor of the hybrid power automobile; or alternatively, the process may be performed,

if the new energy automobile is a pure electric automobile, different control strategy modes are set according to the real-time running working state of the cooling liquid circulation system.

The method for quickly relieving the thermal runaway result of the power battery comprises the following steps of: the water pump works normally-the air conditioner is refrigerated and forced to start the mode; the water pump works normally-the air conditioner is refrigerated and closed; the water pump does not work-the air conditioner is refrigerated and forced to start the mode; the water pump is not operated-the air conditioner is in a refrigerating off mode.

The method for rapidly reducing the thermal runaway consequences of the power battery further comprises the step of setting a control program in any vehicle-mounted electronic control unit of the new energy automobile to detect whether passengers in the automobile cabin are evacuated safely.

The method for rapidly reducing the thermal runaway result of the power battery further comprises the following steps of adding one or more additional steps for increasing the residual quantity of the consumed power battery:

releasing the over-temperature protection function set in all or part of the electric heaters; or alternatively, the process may be performed,

when the new energy automobile is a hybrid power automobile, the step of forcibly driving the motor to drag the engine and the gearbox to rotate at a high speed and keeping the wheels in a disengaged state; or alternatively, the process may be performed,

and when the new energy automobile is a pure electric automobile with a clutch, the clutch is released, and the highest idle motor is forced.

In order to better achieve the object of the present invention, the present invention also provides a device for rapidly reducing the thermal runaway consequences of a power battery, for a new energy automobile provided with an electric heater in a coolant circulation system, the device at least comprising:

the module is used for receiving a power battery thermal event triggering alarm signal;

and the module is used for judging the running state of the cooling liquid circulating system, and when at least one circulating route in the cooling liquid circulating system runs normally, the electric heater is forcedly started to work, so that the residual electric quantity in the power battery is released in a working mode of quickly consuming the thermal power.

The device for rapidly relieving the thermal runaway result of the power battery can forcedly start the cooling function of the vehicle-mounted cooling air conditioning equipment in the cooling liquid circulation system while forcedly starting the electric heater to work.

The device for rapidly reducing the thermal runaway consequences of the power battery, wherein the module for judging the running state of the cooling liquid circulation system further comprises a unit for judging the temperature in the vehicle cabin; wherein, the liquid crystal display device comprises a liquid crystal display device,

when the temperature in the vehicle cabin is lower than a set temperature value, the IGBT unit of the electric heater is forcedly started, and the output power of the IGBT unit is increased to the maximum level by level; wherein the set temperature is the highest temperature of the calibratable value.

The device for rapidly relieving the thermal runaway result of the power battery further comprises an IGBT opening degree adjusting device through an inlet and outlet water temperature sensor.

The device for rapidly relieving the thermal runaway result of the power battery is characterized in that when the electric heater is forcedly started to work, the working mode of the electric heater is a temporary sacrifice power output mode that the real-time power output is far greater than the rated output power value.

The device for quickly relieving the thermal runaway of the power battery is characterized in that the control for triggering and/or closing the forced starting of the electric heater is realized through the program control of the electric control unit of the electric heater and/or the vehicle-mounted heat management electric control unit of the new energy automobile, and the control for triggering and/or closing the cooling function of the forced starting vehicle-mounted cooling air conditioning equipment is realized through the program control of the electric control unit of the vehicle-mounted cooling air conditioning equipment and/or the vehicle-mounted heat management electric control unit of the new energy automobile.

The device for rapidly reducing the thermal runaway of the power battery further comprises: a module for improving the comfort of the passengers who have not escaped is arranged on the premise of ensuring the safety.

The device for rapidly reducing the thermal runaway result of the power battery can be used for transmitting the heat generated by the electric heater and/or the vehicle-mounted cooling air conditioning equipment to an engine or a fuel cell reactor of the hybrid power vehicle if the new energy automobile is the hybrid power vehicle; or alternatively, the process may be performed,

The device for quickly reducing the thermal runaway result of the power battery comprises the following control strategy modes: the water pump works normally-the air conditioner is refrigerated and forced to start the mode; the water pump works normally-the air conditioner is refrigerated and closed; the water pump does not work-the air conditioner is refrigerated and forced to start the mode; the water pump is not operated-the air conditioner is in a refrigerating off mode.

The device for rapidly relieving the thermal runaway result of the power battery further comprises a module for setting a control program to detect whether passengers in the vehicle cabin are evacuated safely in any vehicle-mounted electronic control unit of the new energy automobile.

The device for rapidly reducing the thermal runaway of the power battery further comprises one or more additional modules for increasing the residual power consumption of the power battery, and the device comprises:

a module for releasing the over-temperature protection function of all or part of the electric heaters; or alternatively, the process may be performed,

when the new energy automobile is a hybrid power automobile, the module is used for forcibly driving the motor to drag the engine and the gearbox to rotate at a high speed and keeping wheels in a disengaged state; or alternatively, the process may be performed,

and when the new energy automobile is a pure electric automobile with a clutch, the clutch is released, and the module of the highest idle motor is forced.

In order to better achieve the object of the present invention, the present invention also provides a storage medium having stored thereon a processing program configured to execute the method of rapidly mitigating the consequences of thermal runaway of a power cell as described above when run.

In order to better achieve the aim of the invention, the invention also provides a new energy automobile, which is provided with the device for quickly relieving the thermal runaway result of the power battery.

Of course, the device for rapidly relieving the thermal runaway of the power battery, the storage medium and the new energy automobile provided by the invention correspond to the method and have the beneficial technical effects as above

For a better understanding of the above and other aspects of the invention, reference will now be made in detail to the following examples, which are illustrated in the accompanying drawings, but are not intended to limit the scope of the invention.

Drawings

FIG. 1 is a flow chart of a method for rapidly mitigating the consequences of thermal runaway of a power cell in accordance with one embodiment of the present invention.

Fig. 2 is a schematic diagram of a cooling fluid circulation system of a new energy automobile according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of a cooling fluid circulation system of a new energy automobile according to another embodiment of the present invention.

FIG. 4 is a flowchart of a method for rapidly mitigating the consequences of thermal runaway of a power cell in accordance with another embodiment of the present invention.

Fig. 5 is a flowchart of a method for rapidly mitigating the consequences of thermal runaway of a power cell in accordance with yet another embodiment of the present invention.

Fig. 6 is a schematic diagram of a cooling fluid circulation system of a new energy automobile according to still another embodiment of the present invention.

FIG. 7 is a schematic view of a coolant circulation system of a new energy vehicle according to still another embodiment of the present invention

Fig. 8 is a flowchart of a method for rapidly mitigating the consequences of thermal runaway of a power cell in accordance with yet another embodiment of the invention.

Fig. 9 is a block diagram of a device for rapidly mitigating the consequences of thermal runaway of a power cell in accordance with one embodiment of the present invention.

Fig. 10 is a block diagram of a device for rapidly mitigating the consequences of thermal runaway of a power cell according to another embodiment of the invention.

FIG. 11 is a block diagram showing the structure of an apparatus for rapidly mitigating the thermal runaway consequences of a power cell according to yet another embodiment of the invention

Fig. 12 is a block diagram of a device for rapidly mitigating the consequences of thermal runaway of a power cell in accordance with yet another embodiment of the invention.

Wherein, the reference numerals:

100. 100', 100' -coolant circulation system

1-electric heater

2-expansion tank

3-water pump

4-heat exchanger

5-power battery

6-vehicle cooling air conditioning equipment

7-engine

8-fuel cell reactor

200. 200', 200", 200'" -means for rapidly mitigating the consequences of thermal runaway of a power cell

201-receive module for triggering power cell thermal event alarm signal

202-module for judging operation state of cooling liquid circulation system

203-inlet-outlet water temperature sensor

204-Module for improving the comfort of an unexpired occupant while ensuring safety

205-module for detecting whether an occupant in a vehicle cabin has been evacuated safely

206-Module for increasing residual quantity of consumed power battery

S1-S5 and S21-steps of method for rapidly relieving thermal runaway consequences of power battery

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be appreciated that references in the specification to "one embodiment," "an example embodiment," etc., mean that the embodiment being described may include, but do not necessarily include, a particular feature, structure, or characteristic. Furthermore, such phrases are not intended to refer to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

It should be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Certain terms are used throughout the description and following claims to refer to particular modules, components, or parts, as those of ordinary skill in the art will appreciate that a technical user or manufacturer may refer to the same module, component, or part by different terms. The present specification and the following claims do not take the form of an identification of a module, component or element by differences in terms of names, but rather take the form of a functional identification of a module, component or element by differences in functions. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The term "coupled," as used herein, includes any direct or indirect electrical connection. Indirect electrical connection means include connection via other devices.

Furthermore, in the following specification and claims, reference will be made to a number of terms, which shall be defined to have the following meanings. The singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. "optional" or "optionally" means that the subsequently described event or circumstance may or may not occur, and that the description includes instances where the event occurs and instances where it does not.

The core of the invention is to provide a method and a device for rapidly relieving the thermal runaway consequences of a power battery, which can cope with various thermal runaway scenes and rapidly relieve the thermal runaway consequences, thereby reducing the risks caused by the thermal runaway and the thermal diffusion of the power battery and even the complete combustion of the whole vehicle and reserving more escape time for passengers. In addition, the parts of the new energy automobile are not required to be improved or hardware equipment is not required to be additionally arranged, the use is convenient, and the application range is wide.

Referring to fig. 1 and 2, fig. 1 is a flowchart illustrating a method for rapidly reducing the thermal runaway of a power battery according to an embodiment of the invention, and fig. 2 is a schematic diagram illustrating a coolant circulation system 100 of a new energy automobile according to an embodiment of the invention.

The method for rapidly reducing the thermal runaway consequences of the power battery provided by the invention is used for a new energy automobile provided with an electric heater 1 in a cooling liquid circulation system 100, and at least comprises the following steps:

S1: receiving a power battery thermal event triggering alarm signal;

s2: judging the operation state of the cooling liquid circulation system 100, when at least one circulation route in the cooling liquid circulation system 100 is in normal operation, forcibly starting the electric heater 1 to work, and releasing the residual electric quantity in the power battery 5 in a working mode of rapidly consuming thermal power.

After the power battery of the new energy automobile fails, a thermal event alarm signal is triggered, wherein the thermal event alarm signal is a signal provided by a power battery pack or a system 5 minutes before the danger of the passenger cabin is caused by thermal diffusion caused by thermal runaway of a single battery. And after receiving the power battery thermal event triggering alarm signal, further judging the running state of the cooling liquid circulation system. In one embodiment, as shown in fig. 2, a cooling fluid circulation system 100 of the new energy automobile includes an electric heater 1, an expansion tank 2, a water pump 3, a heat exchanger 4, and a power battery 5, and the cooling fluid circulation system 100 is formed by a circulation route. In the new energy vehicle, the operation state of the coolant circulation system 100 is determined by the thermal management controller (TMS, thermal management system). Further, the thermal management controller determines whether the coolant circulation system 100 is operating normally by combining the IGBT output power signal of the thermal management controller and the thermal management history data, through the signal sent by the ECU controller of the water pump 3 and the inlet and outlet water temperature value sent by the ECU controller of the electric heater 1 on the vehicle bus. If one circulation route in the cooling liquid circulation system runs normally, the electric heater 1 is forcedly started to work, and the residual electric quantity in the power battery is released in a working mode of quickly consuming thermal power. Specifically, if the rated power of the electric heater 1 is 5kw, in 5 minutes after receiving the power battery thermal event alarm signal, 0.42kWh of battery energy can be consumed by the heat exchanger 4, 2.5kWh of battery energy can be consumed in 30 minutes, and 5kWh of battery energy can be consumed in 60 minutes in the case that the water pump 3 is operating normally. The electric heater 1 includes a PTC type heater and a non-PTC type heater, the coolant circulation system 100 may have other structures, and the circulation route may be more, which is not limited to this. In addition, step S2 further includes a step of determining that the alarm signal is a false alarm according to the temperature and the voltage of the power battery 5, and stopping the forced start of the electric heater 1 if the alarm signal is a false alarm.

In the embodiment of the invention, the residual electric quantity in the power battery is rapidly consumed by utilizing the existing electric heater of the new energy automobile, namely, the energy released by combustion in the original power battery pack is transferred to other relatively safe parts of the new energy automobile through forced operation of the electric heater. When the residual electric quantity of the power battery is low, the dry power battery can be further consumed, so that the combustion of the power battery is further relieved or interrupted, the safety of a new energy automobile can be effectively improved, and the thermal runaway effect of the power battery is rapidly reduced.

As a preferred embodiment, in step S2, further comprising:

the cooling function of the in-vehicle cooling air conditioning apparatus 6 in the coolant circulation system 100' is forcibly started while the electric heater 1 is forcibly started to operate.

Referring to fig. 3, fig. 3 is a schematic diagram of a coolant circulation system 100 'of a new energy vehicle according to another embodiment of the present invention, and compared with the coolant circulation system 100, the coolant circulation system 100' is different in that a vehicle-mounted cooling air conditioning device 6 is further provided, and the vehicle-mounted cooling air conditioning device 6 and the electric heater 1 are connected into the same pipeline. When the electric heater 1 is forcedly started to work by the method, the cooling function of the vehicle-mounted cooling air conditioning equipment 6 is forcedly started at the same time, so that the consumption of the residual energy in the power battery is further accelerated. The vehicle cooling air conditioning apparatus 6 includes an air conditioning evaporator, but the present invention is not limited thereto.

In the embodiment of the invention, for the new energy automobile with the vehicle-mounted cooling air conditioning equipment and the electric heater connected into the same cooling liquid circulation system pipeline, the step of forcibly starting the vehicle-mounted cooling air conditioning equipment is arranged, so that the electric heater is forcibly started, and meanwhile, the vehicle-mounted cooling air conditioning equipment is forcibly started to accelerate the consumption of the residual energy of the power battery, and the thermal runaway effect of the power battery can be accelerated and lightened.

As a preferred embodiment, in step S2, the control of triggering and/or turning off the operation of the forced starting electric heater 1 is implemented by the program control of the electric control unit of the electric heater 1 and/or the in-vehicle thermal management electric control unit of the new energy automobile, and the control of triggering and/or turning off the cooling function of the forced starting in-vehicle cooling air conditioning apparatus 6 is implemented by the program control of the electric control unit of the in-vehicle cooling air conditioning apparatus 6 and/or the in-vehicle thermal management electric control unit of the new energy automobile.

In the embodiment of the invention, any hardware equipment on the existing various new energy vehicles is not required to be added, and only software update development is required to be carried out on an electric control unit capable of processing the thermal event alarm signal, namely, the method for rapidly relieving the thermal runaway result of the power battery CAN be realized by adding software control logic on the basis of complete CAN/LIN whole vehicle communication development, and is convenient to use and wide in application range.

As a preferred embodiment, in step S2, the step of forcibly starting the operation of the electric heater 1 further includes:

s21: and judging the temperature in the vehicle cabin, when the temperature in the vehicle cabin is lower than a set temperature value, forcibly starting the IGBT unit of the electric heater 1, and gradually maximizing the output power of the IGBT unit. The method comprises the steps of setting the temperature to be the highest temperature of a calibratable value, and adjusting the opening of the IGBT through an inlet and outlet water temperature sensor.

Referring to fig. 4, fig. 4 is a flowchart of a method for rapidly mitigating thermal runaway consequences of a power cell according to another embodiment of the invention. In one embodiment, the temperature in the cabin of the new energy automobile is further determined before the electric heater 1 is forcibly started to operate by the method. If the temperature in the vehicle cabin is lower than a set temperature value, the electric heater 1 is forcedly started by forcedly starting the IGBT unit in the electric heater 1, and the output power of the IGBT unit is increased to the maximum step by step. Specifically, the coolant circulation system 100, 100' further includes a water temperature sensor (not shown) disposed at the inlet and outlet of the electric heater 1, and senses the water temperature at the inlet and outlet of the electric heater 1 through the water temperature sensor, and then adjusts the opening of the IGBT, that is, if the water temperature at the inlet and outlet increases, increases the opening of the IGBT, so that the power of the electric heater 1 increases, and the consumption of the energy remaining in the power battery is accelerated. The set temperature value is the highest temperature of the calibratable value, specifically, the set temperature value in the vehicle cabin is 37 ℃, and the temperature in the vehicle cabin is detected by the vehicle-mounted temperature sensor, but the invention is not limited to this.

In the embodiment of the invention, before the electric heater is forcedly started to work, sensing and judging of the temperature in the cabin are advanced, and if the temperature in the cabin is low, the electric heater is driven to work by starting the IGBT unit, so that the condition that passengers which have not escaped exist in the cabin is avoided, and when the temperature in the cabin is high, the electric heater is started, so that the temperature in the cabin is further increased, and the escape risk of the passengers is increased.

In a preferred embodiment, in step S2, when the electric heater 1 is forcibly started to operate, the operation mode of the electric heater 1 is a temporary sacrificial power output mode in which the real-time power output is much larger than the rated output power value.

After the new energy automobile receives the alarm signal for triggering the thermal event of the power battery, the automobile is generally burnt out due to the thermal diffusion of the power battery. In the embodiment of the invention, when the electric heater is forcedly started to work, the real-time power output of the electric heater is far larger than the rated output power value, namely the electric heater operates in a temporary sacrifice power output mode, so that the residual electric quantity of the power battery is more rapidly consumed, and the effect of rapidly reducing the thermal runaway result of the power battery is further achieved.

As a preferred embodiment, still further comprising:

S3: a step of improving the comfort of the passengers who have not escaped under the premise of ensuring the safety is provided. Wherein if the new energy vehicle is a hybrid vehicle, the heat generated by the electric heater 1 and/or the on-vehicle cooling air conditioning apparatus 6 is transferred to the engine 7 or the fuel cell reactor 8 of the hybrid vehicle; or alternatively, the process may be performed,

if the new energy vehicle is a pure electric vehicle, different control strategy modes are set according to the real-time running working state of the cooling liquid circulation system 100'.

Referring to fig. 5, 6 and 7, fig. 5 is a flowchart of a method for rapidly reducing the thermal runaway of a power battery according to another embodiment of the present invention, fig. 6 is a schematic diagram of a coolant circulation system 100″ of a new energy automobile according to another embodiment of the present invention, and fig. 7 is a schematic diagram of a coolant circulation system 100' "of a new energy automobile according to another embodiment of the present invention. In a specific embodiment, when the power battery of the new energy automobile generates heat diffusion, in order to enable the passengers to escape smoothly, a step of improving the comfort of the passengers which have not escaped on the premise of ensuring the safety is further provided. Specifically, for the hybrid vehicle, the coolant circulation system 100", 100 '" further includes the engine 7 or the fuel cell reactor 8 and the coolant circulation system 100", 100'" has a plurality of circulation routes, and when the electric heater 1 and/or the in-vehicle cooling air conditioner 6 are forcedly started to operate by the above method, the heat generated by the electric heater 1 and/or the in-vehicle cooling air conditioner 6 is transferred to the engine 7 or the fuel cell reactor 8 of the hybrid vehicle by controlling the heat exchanger 4, thereby avoiding transferring a large amount of heat generated by the forcedly starting to the inside of the vehicle cabin, making the temperature environment inside the vehicle cabin worse, and increasing the risk that the occupant has not escaped yet. In addition, referring to fig. 3 again, for a pure electric vehicle, different control strategy modes are set according to the real-time operation state of the coolant circulation system 100'. The heat exchanger 4 is controlled to transfer heat to different positions in the cabin through a control program of the vehicle-mounted electronic control unit, and the invention is not described herein.

As a preferred embodiment, in step S3, the control strategy mode includes a water pump normal operation-air conditioner cooling strong start mode; the water pump works normally-the air conditioner is refrigerated and closed; the water pump does not work-the air conditioner is refrigerated and forced to start the mode; the water pump is not operated-the air conditioner is in a refrigerating off mode.

In one embodiment, the power level of the IGBTs and the location at which the heat exchanger 4 is turned on for delivery are correspondingly different for the four different control strategy modes. In the normal operation of the water pump-forced start mode of air conditioning refrigeration, the vehicle-mounted cooling air conditioning equipment 6 is in a forced start state, and the refrigerating capacity in the vehicle cabin is sufficient, so that the real-time power output of the electric heater 1 is far greater than the rated output power value, and the heat exchanger 4 is controlled to transmit heat to any part in the vehicle cabin, and the real-time power of the electric heater 1 is 100% -120% of the rated power, but the invention is not limited to this. The forced start of the vehicle-mounted cooling air conditioning device 6 and the temporary sacrifice power output mode of the electric heater 1 do not cause excessive changes in the temperature in the cabin. Meanwhile, the window is controlled to be opened, so that the power consumption is further increased.

In the normal working of the water pump-air conditioning refrigeration off mode, the vehicle-mounted cooling air conditioning equipment 6 is in an off state, so that the real-time power output of the electric heater 1 is far greater than the rated output power value, the heat exchanger 4 is controlled to convey heat to a windshield or an unmanned place in the vehicle cabin, and the vehicle window is controlled to open for heat dissipation, so that the discomfort of the body of an occupant who has not escaped is avoided due to overhigh temperature in the vehicle cabin. The real-time power of the electric heater 1 is 100% -120% of rated power, but the invention is not limited thereto.

In the water pump non-working-air conditioning refrigeration forced starting mode, the vehicle-mounted cooling air conditioning equipment 6 is in a forced starting state, and as the water pump 3 is not working and air conditioning refrigeration is in progress, the difference of cold water and hot water at the cold water end and the hot water end of the electric heater 1 can also cause low-speed flow of liquid, so that the cooling and heat dissipation of the electric heater 1 are further promoted. Therefore, the real-time power output of the electric heater 1 is made smaller than the rated output power value, and the heat exchanger 4 is controlled to transmit heat to any part in the vehicle cabin, the real-time power of the electric heater 1 is 30% -60% of the rated power, but the invention is not limited thereto.

In the water pump non-working-air conditioning refrigeration off mode, the vehicle-mounted cooling air conditioning equipment 6 is in a off state, namely, the water pump 3 and the vehicle-mounted cooling air conditioning equipment 6 are not working, and the difference of cold water and hot water of the cold water end and the hot water end of the electric heater 1 can also cause low-speed flow of liquid, so that the cooling and heat dissipation of the electric heater 1 are further promoted. Therefore, when the passengers in the vehicle cabin have not escaped, the real-time power output of the electric heater 1 is smaller than the rated output power value, and the heat exchanger 4 is controlled to transmit heat to any part in the vehicle cabin, and the real-time power of the electric heater 1 is 30% -60% of the rated power, but the invention is not limited thereto. When the passengers in the vehicle cabin escape, the real-time power of the electric heater 1 is gradually increased. Further, whether the passengers in the vehicle cabin escape is judged by the vehicle-mounted electronic control unit is not taken as an example. Furthermore, the working state of the water pump is obtained according to the signal of the water pump working sensor transmitted by the LIN or CAN bus, and the invention is not repeated here

In the embodiment of the invention, different control strategies are respectively adopted for different new energy automobiles and different thermal runaway scenes, so that the comfort of the passengers who have not escaped is improved on the premise of ensuring the safety, and the risk of danger of the passengers in the escape process is reduced.

As a preferred embodiment, further comprising:

s4: setting a control program in any vehicle-mounted electronic control unit of the new energy automobile to detect whether passengers in the automobile cabin are evacuated safely; the method comprises the steps of,

s5: further providing additional one or more steps for increasing the remaining power of the power consuming battery, comprising:

Referring to fig. 2, 3, 6 and 8 in combination, fig. 8 is a flowchart of a method for rapidly mitigating thermal runaway consequences of a power cell according to yet another embodiment of the invention. In one embodiment, the on-board electronic control unit on the new energy vehicle is further provided with a control program for detecting whether the passengers in the vehicle cabin have been evacuated safely. If the occupant in the vehicle cabin has judged to be safely evacuated, a step of consuming the remaining power of the power battery may be further added. Specifically, for the non-PTC type electric heater 1, the excess temperature protection function provided in all or part of the electric heater 1 is released, so that the consumption of the remaining power of the power battery is further increased; for the hybrid vehicle, the consumption of the remaining power of the power battery is further increased by forcibly driving the motor (not shown) to rotate the engine 7 and the transmission (not shown) at a high speed and controlling the wheels (not shown) to maintain the disengaged state; for a pure electric vehicle with a clutch (not shown), the consumption of electric power is increased by disengaging the clutch and forcing the highest speed idle motor; and, forcibly starting other high-power loads which do not drive the wheels. The control of the motor, the engine 7, the gearbox, the wheels, the clutch and other high-power load devices is realized by a vehicle-mounted electronic control unit, and the invention is not repeated herein.

In the embodiment of the invention, under the condition that the passengers in the vehicle cabin are safely evacuated, the high-power load equipment arranged on the new energy automobile is started to accelerate the consumption of the residual electric power in the power battery, so that the effect of quickly reducing the thermal runaway result is realized.

The method for rapidly reducing the thermal runaway result of the power battery is based on triggering a power battery thermal event alarm signal, and according to the running state of a cooling liquid circulation system, the residual electric quantity in the power battery is released in a working mode of rapidly consuming thermal power by forcibly starting an existing electric heater in a new energy automobile to work. In contrast, in the thermal runaway control method in the prior art, engineering improvement and optimization are performed on the power battery, the related electric control unit and parts adjacent to the energy management parts, the specifications of the parts of different new energy automobiles are different, and unified implementation of improvement and optimization is difficult. Furthermore, the existing thermal runaway control method cannot quickly alleviate the thermal runaway consequences, and cannot reserve more escape time for passengers. Therefore, the method for rapidly relieving the thermal runaway result of the power battery can rapidly relieve the thermal runaway result, reduce the risk caused by the thermal runaway and the thermal diffusion of the power battery and even the complete combustion of the whole vehicle, and reserve more abundant escape time for passengers. In addition, the parts of the new energy automobile are not required to be improved or hardware equipment is not required to be additionally arranged, the use is convenient, and the application range is wide.

Referring to fig. 9, fig. 9 is a block diagram of an apparatus for rapidly mitigating thermal runaway consequences of a power cell according to an embodiment of the invention. The apparatus 200 for rapidly mitigating the consequences of thermal runaway of a power cell comprises at least:

a module 201 that receives a trigger power battery thermal event alert signal;

and a module 202 for judging the operation state of the cooling liquid circulation system, wherein when at least one circulation route in the cooling liquid circulation system is in normal operation, the electric heater is forcedly started to work, so that the residual electric quantity in the power battery is released in a working mode of rapidly consuming thermal power.

As a preferred embodiment, in the module 202 for determining the operation state of the coolant circulation system, a cooling function of the vehicle-mounted cooling air conditioning apparatus in the coolant circulation system is forcibly started while the electric heater is forcibly started.

As a preferred embodiment, the control of triggering and/or turning off the forced starting of the operation of the electric heater is realized by the program control of the electric control unit of the electric heater and/or the on-board thermal management electric control unit of the new energy automobile, and the control of triggering and/or turning off the cooling function of the forced starting of the on-board cooling air conditioning equipment is realized by the program control of the electric control unit of the on-board cooling air conditioning equipment and/or the on-board thermal management electric control unit of the new energy automobile.

The specific embodiments and the beneficial technical effects of the module 201 for receiving the triggering power battery thermal event alarm signal and the module 202 for judging the operation state of the coolant circulation system are described in the above steps S1 to S2, and are not repeated here.

Referring to fig. 10, fig. 10 is a block diagram of an apparatus 200' for rapidly mitigating thermal runaway consequences of a power cell according to another embodiment of the invention.

As a preferred embodiment, the module 202 for judging the operation state of the coolant circulation system further includes a unit (not shown) for judging the temperature in the cabin; wherein, the liquid crystal display device comprises a liquid crystal display device,

when the temperature in the vehicle cabin is lower than a set temperature value, the IGBT unit of the electric heater is forcedly started, and the output power of the IGBT unit is increased to the maximum level by level; wherein the set temperature is the highest temperature of the calibratable values, and the method further comprises adjusting the opening of the IGBT through the inlet and outlet water temperature sensor 203.

The specific embodiment and the beneficial technical effects of the unit for determining the temperature in the vehicle cabin are described in the above step S21, and are not described herein.

As a preferred embodiment, when the electric heater is forcefully started to work, the electric heater is operated in a temporary sacrifice power output mode that the real-time power output is far greater than the rated output power value.

The specific embodiments and advantageous technical effects of the final sacrificial power output mode are described in the above step S2, and are not described herein.

Referring to fig. 11, fig. 11 is a block diagram of an apparatus 200″ for rapidly mitigating thermal runaway consequences of a power battery according to yet another embodiment of the present invention.

As a preferred embodiment, the apparatus 200″ for rapidly mitigating the consequences of thermal runaway of a power battery further includes: a module 204 is provided that improves the comfort of an unexpired occupant while ensuring safety. If the new energy automobile is a hybrid power automobile, the heat generated by the electric heater and/or the vehicle-mounted cooling air conditioning equipment is transmitted to an engine or a fuel cell reactor of the hybrid power automobile; or alternatively, the process may be performed,

As a preferred embodiment, the control strategy mode includes a water pump normal operation-air conditioner refrigeration strong start mode; the water pump works normally-the air conditioner is refrigerated and closed; the water pump does not work-the air conditioner is refrigerated and forced to start the mode; the water pump is not operated-the air conditioner is in a refrigerating off mode.

The specific embodiments and advantageous technical effects of the module 204 for improving the comfort of the passenger who has not been fleed for life while ensuring the safety are described in the above step S3, and are not repeated here.

Referring to fig. 12, fig. 12 is a block diagram of a device 200' "for rapidly mitigating thermal runaway consequences of a power cell according to yet another embodiment of the invention.

As a preferred embodiment, the device 200' "for rapidly mitigating the consequences of thermal runaway of the power battery further comprises a module 205 for setting a control program to detect whether the occupants in the cabin have been evacuated safely in any on-board electronic control unit of the new energy vehicle.

As a preferred embodiment, the apparatus 200' "for rapidly mitigating the consequences of thermal runaway of a power battery is further provided with one or more additional modules 206 for increasing the remaining power of the power battery, comprising:

The specific embodiments and advantageous technical effects of the module 205 for detecting whether the occupant in the vehicle cabin has been evacuated safely and the module 206 for increasing the remaining power consumption of the power battery are as described in the above steps S4 to S5, and are not repeated here.

Since the embodiments of the apparatus portion and the embodiments of the method portion correspond to each other, the embodiments of the apparatus portion are referred to the description of the embodiments of the method portion, and are not repeated herein. It should be noted that the above proposed device may be implemented in other manners. For example, the embodiments of the apparatus described above are merely illustrative, such as the division of the modules described above, and merely a logical function division, and there may be additional divisions of a practical implementation, such as multiple modules may be combined or integrated into another system, or some features may be omitted or not implemented.

An embodiment of the invention also provides a storage medium having stored thereon a processing program configured to, when run, perform a method of rapidly mitigating the consequences of thermal runaway of a power cell as described above. Specifically, the processing program includes electronic controller software and electronic control software applied to the new energy automobile, but the invention is not limited thereto.

One embodiment of the present invention also provides a new energy vehicle provided with the device 200, 200', 200", 200'" for rapidly mitigating the consequences of thermal runaway of a power battery as described above.

The method, the device, the storage medium and the new energy automobile for rapidly relieving the thermal runaway result of the power battery are described in detail. In the description, each embodiment is described in a progressive manner, and each embodiment is mainly described by the differences from other embodiments, so that the same similar parts among the embodiments are mutually referred. For the device, the storage medium and the new energy automobile disclosed in the embodiment, the description is simpler because the device, the storage medium and the new energy automobile correspond to the method disclosed in the embodiment, and the relevant parts are only needed to be referred to in the description of the method section.

Of course, the present invention is capable of other various embodiments and its several details are capable of modification and variation in light of the present invention, as will be apparent to those skilled in the art, without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method for rapidly mitigating the consequences of thermal runaway of a power battery for a new energy vehicle provided with an electric heater in a coolant circulation system, the method comprising at least the steps of:

receiving a power battery thermal event triggering alarm signal;

Judging the running state of the cooling liquid circulating system, and when at least one circulating route in the cooling liquid circulating system runs normally, forcibly starting the electric heater to work so as to release the residual electric quantity in the power battery in a working mode of quickly consuming thermal power.

2. The method for quickly mitigating thermal runaway consequences of a power battery of claim 1, wherein said forcibly activating said electric heater operates while forcibly activating a cooling function of an on-board cooling air conditioning unit in said coolant circulation system.

3. The method of claim 1 or 2, wherein the step of forcibly activating the electric heater to operate further comprises:

judging the temperature in the vehicle cabin, when the temperature in the vehicle cabin is lower than a set temperature value, forcibly starting an IGBT unit of the electric heater, and gradually maximizing the output power of the IGBT unit; wherein the set temperature is the highest temperature of the calibratable value.

4. A method of rapidly mitigating the consequences of thermal runaway for a power cell according to claim 3, further comprising adjusting the opening of said IGBT by an inlet and outlet water temperature sensor.

5. The method of claim 4, wherein the operating mode of the electric heater is a near-net sacrificial power output mode in which real-time power output is substantially greater than a nominal output power value when the electric heater is forced to operate.

6. A method for quickly mitigating the consequences of thermal runaway of a power battery according to claim 3, characterized in that the control of triggering and/or turning off the forced activation of the operation of the electric heater is performed by a program control of an electric control unit of the electric heater and/or an on-board thermal management electric control unit of the new energy vehicle, and the control of triggering and/or turning off the forced activation of the cooling function of the on-board cooling air conditioning device is performed by a program control of an electric control unit of the on-board cooling air conditioning device and/or an on-board thermal management electric control unit of the new energy vehicle.

7. The method of rapidly mitigating thermal runaway consequences of a power cell of claim 2, further comprising: a step of improving the comfort of the passengers who have not escaped under the premise of ensuring the safety is provided.

8. The method of quickly mitigating consequences of thermal runaway for a power battery of claim 7, wherein if said new energy vehicle is a hybrid vehicle, delivering heat generated by said electric heater and/or said on-board cooling air conditioner to an engine or fuel cell reactor of said hybrid vehicle; or alternatively, the process may be performed,

9. The method of quickly mitigating thermal runaway consequences of a power battery of claim 8, wherein said control strategy mode comprises: the water pump works normally-the air conditioner is refrigerated and forced to start the mode; the water pump works normally-the air conditioner is refrigerated and closed; the water pump does not work-the air conditioner is refrigerated and forced to start the mode; the water pump is not operated-the air conditioner is in a refrigerating off mode.

10. The method for quickly mitigating thermal runaway consequences of a power cell according to claim 1, 2, 4, 7, 8 or 9, further comprising the step of providing a control program in any one of said on-board electronic control units of said new energy vehicle to detect whether an occupant in the vehicle cabin has been evacuated safely.

11. The method of claim 10, further comprising the additional step of one or more of increasing the power cell residual capacity, comprising:

releasing all or part of the over-temperature protection function arranged in the electric heater; or alternatively, the process may be performed,

and when the new energy automobile is a pure electric automobile with a clutch, the clutch is released, and the motor is forced to idle at the highest speed.

12. A device for rapidly mitigating the consequences of thermal runaway of a power battery for a new energy vehicle provided with an electric heater in a coolant circulation system, the device comprising at least:

and the module is used for judging the running state of the cooling liquid circulating system, and when at least one circulating route in the cooling liquid circulating system runs normally, the electric heater is forcedly started to work so as to release the residual electric quantity in the power battery in a working mode of quickly consuming thermal power.

13. The apparatus for quickly mitigating thermal runaway consequences of a power battery of claim 12, wherein said forced activation of said electric heater operates while forcing activation of a cooling function of an on-board cooling air conditioning unit in said coolant circulation system.

14. The apparatus for rapidly mitigating the consequences of thermal runaway of a power battery according to claim 12 or 13, wherein said means for determining the operating condition of said coolant circulation system further comprises a means for determining the temperature in the cabin; wherein, the liquid crystal display device comprises a liquid crystal display device,

when the temperature in the cabin is lower than a set temperature value, the IGBT unit of the electric heater is forcedly started, and the output power of the IGBT unit is increased to the maximum step by step; wherein the set temperature is the highest temperature of the calibratable value.

15. The apparatus for quickly mitigating consequences of thermal runaway for a power cell of claim 14, further comprising adjusting an opening of said IGBT by an inlet and outlet water temperature sensor.

16. The apparatus for quickly mitigating consequences of thermal runaway in a power cell of claim 15, wherein said operating mode of said electric heater is a near-net sacrificial power output mode in which real-time power output is substantially greater than a nominal output power value when said electric heater is forced to operate.

17. The apparatus for quickly mitigating consequences of thermal runaway in a power battery according to claim 14, wherein the control of triggering and/or turning off the forced activation of the electric heater is performed by a program control of an electric control unit of the electric heater and/or an on-board thermal management electric control unit of the new energy automobile, and the control of triggering and/or turning off the forced activation of the cooling function of the on-board cooling air conditioning apparatus is performed by a program control of an electric control unit of the on-board cooling air conditioning apparatus and/or an on-board thermal management electric control unit of the new energy automobile.

18. The apparatus for rapidly mitigating thermal runaway consequences of a power cell of claim 13, further comprising: a module for improving the comfort of the passengers who have not escaped is arranged on the premise of ensuring the safety.

19. The apparatus for quickly mitigating consequences of thermal runaway of a power battery of claim 18, wherein if said new energy vehicle is a hybrid vehicle, heat generated by said electric heater and/or said on-board cooling air conditioner is transferred to an engine or fuel cell reactor of said hybrid vehicle; or alternatively, the process may be performed,

20. The apparatus for rapidly mitigating consequences of thermal runaway for a power battery of claim 19, wherein said control strategy mode comprises: the water pump works normally-the air conditioner is refrigerated and forced to start the mode; the water pump works normally-the air conditioner is refrigerated and closed; the water pump does not work-the air conditioner is refrigerated and forced to start the mode; the water pump is not operated-the air conditioner is in a refrigerating off mode.

21. The apparatus for rapidly mitigating thermal runaway consequences of a power cell according to claim 12, 13, 15, 18, 19 or 20, further comprising a module for providing a control program to detect whether an occupant in the vehicle cabin has been evacuated safely in any one of the on-board electronic control units of the new energy vehicle.

22. The apparatus for rapidly mitigating the consequences of thermal runaway of a power cell of claim 21, further comprising one or more additional modules for increasing the power consumption of the power cell, comprising:

a module for releasing all or part of the over-temperature protection function arranged in the electric heater; or alternatively, the process may be performed,

When the new energy automobile is a hybrid power automobile, the module is used for forcing the driving motor to drag the engine and the gearbox to rotate at a high speed and keeping wheels in a disengaged state; or alternatively, the process may be performed,

and when the new energy automobile is a pure electric automobile with a clutch, the clutch is released, and the module of the motor is forced to idle at the highest speed.

23. A storage medium having stored thereon a processing program, characterized in that the processing program is arranged to execute the method of quickly mitigating the consequences of thermal runaway of a power cell according to any of the claims 1-11 when run.

24. A new energy vehicle provided with a device for rapidly mitigating the consequences of thermal runaway of a power cell according to any one of claims 12 to 22.