Battery thermal runaway disposal method and vehicle

Abstract

The invention provides a battery thermal runaway disposal method and a vehicle, and relates to the technical field of vehicles. The battery thermal runaway disposal method is applied to the electric vehicle, the electric vehicle comprises a main battery pack and a standby battery pack, and the battery thermal runaway disposal method comprises the steps that a battery pack thermal runaway event is monitored; when the battery pack thermal runaway event indicates that the main battery pack is in thermal runaway, controlling or waiting for the speed of the electric vehicle to zero; and the main battery pack is controlled to be separated from the electric vehicle, and the standby battery pack is controlled to supply power to the electric vehicle. When the thermal runaway event occurs in the main battery pack, the vehicle speed of the electric vehicle is controlled or waited to be zero, the safety of separation of the main battery pack is guaranteed, then the main battery pack with thermal runaway is controlled to be separated from the electric vehicle, and therefore the safety of the electric vehicle is guaranteed, and finally the standby battery pack supplies power to the electric vehicle. And effective battery thermal runaway treatment is realized.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a battery thermal runaway treatment method and a vehicle. Background Art

[0002] New energy vehicles are vehicles that use non-traditional fuel as a power source, mainly including electric vehicles (pure electric vehicles and hybrid vehicles) and fuel cell vehicles. Among them, electric vehicles rely entirely or partially on battery power, mainly lightweight and high-energy-density lithium-ion batteries for power supply.

[0003] However, lithium-ion batteries may experience thermal runaway due to excessive charging and discharging, external physical damage, overheating and manufacturing defects, causing lithium-ion batteries to spontaneously combust. The fire can spread to the vehicle body in a very short time, causing irreparable property losses to users. Summary of the invention

[0004] The problem solved by the present invention is how to achieve battery thermal runaway disposal.

[0005] In order to solve the above problems, the present invention provides a battery thermal runaway treatment method and a vehicle.

[0006] In a first aspect, the present invention provides a battery thermal runaway handling method, which is applied to an electric vehicle, wherein the electric vehicle includes a main battery pack and a backup battery pack, and the battery thermal runaway handling method includes:

[0007] Monitor battery pack thermal runaway events;

[0008] When the battery pack thermal runaway event indicates that the main battery pack is thermally runaway, controlling or waiting for the speed of the electric vehicle to reach zero;

[0009] The main battery pack is controlled to be detached from the electric vehicle, and the backup battery pack is controlled to supply power to the electric vehicle.

[0010] Optionally, monitoring a battery pack thermal runaway event includes:

[0011] One or more of temperature monitoring, voltage monitoring, current monitoring, gas detection, pressure monitoring and infrared thermal imaging are employed for the main battery pack.

[0012] Optionally, when the main battery pack is in thermal runaway, controlling or waiting for the speed of the electric vehicle to reach zero includes:

[0013] If the speed of the electric vehicle is less than a preset speed, waiting for the speed of the electric vehicle to reach zero;

[0014] If the speed of the electric vehicle is greater than or equal to the preset speed, the speed of the electric vehicle is controlled to zero.

[0015] Optionally, controlling the speed of the electric vehicle to zero includes:

[0016] The power battery torque limiting strategy is activated to reduce the speed of the electric vehicle to zero.

[0017] Optionally, the electric vehicle further comprises a battery ejection device, and the main battery pack is installed on the electric vehicle through the battery ejection device; and controlling the main battery pack to be separated from the electric vehicle comprises:

[0018] The battery ejection device is activated to eject the main battery pack from the electric vehicle.

[0019] Optionally, the battery ejection device includes a locking device and an energy storage device, and the main battery pack is installed on the electric vehicle through the locking device; activating the battery ejection device to eject the main battery pack from the electric vehicle includes:

[0020] Controlling the locking device to separate from the main battery pack;

[0021] The energy storage device is controlled to eject the main battery pack.

[0022] Optionally, the battery thermal runaway treatment method further includes:

[0023] When the main battery pack is in thermal runaway, an alarm is sent to the driver.

[0024] Optionally, the battery thermal runaway treatment method further includes:

[0025] Before the main battery pack is detached from the electric vehicle, a pop-up prompt is sent to the driver.

[0026] Optionally, the battery thermal runaway treatment method further includes:

[0027] When the backup battery pack supplies power to the electric vehicle, a drive-away reminder is sent to the driver.

[0028] In a second aspect, the present invention provides a vehicle, comprising a computer-readable storage medium storing a computer program and a processor, wherein when the computer program is read and executed by the processor, the above-mentioned battery thermal runaway handling method is implemented.

[0029] The present invention first controls or waits for the speed of the electric vehicle to reach zero when a thermal runaway event occurs in the main battery pack, thereby ensuring the safety of the main battery pack detaching. The present invention then controls the main battery pack in thermal runaway to detach from the electric vehicle, thereby ensuring the safety of the electric vehicle. Finally, the electric vehicle is powered by the backup battery pack. At this time, the driver can use the power of the backup battery pack to drive the vehicle away from the parking point where the main battery pack detaches, thereby preventing the fire in the main battery pack from being transmitted to the electric vehicle, thereby further improving safety. The above three steps are used together to achieve effective battery thermal runaway disposal. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of a process for handling battery thermal runaway according to an embodiment of the present invention;

[0031] Figure 2 A flowchart of a method for handling thermal runaway of a battery according to an embodiment of the present invention;

[0032] Figure 3 The figure is a schematic diagram of the system structure of an electronic device in a vehicle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0034] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0035] like Figure 1 As shown, an embodiment of the present invention provides a battery thermal runaway handling method, which is applied to an electric vehicle, wherein the electric vehicle includes a main battery pack and a backup battery pack, and the battery thermal runaway handling method includes:

[0036] Monitor battery pack thermal runaway events.

[0037] Specifically, thermal runaway events in battery packs include spontaneous combustion of lithium-ion batteries, and the main causes include excessive charging and discharging, external physical damage, overheating, and manufacturing defects:

[0038] (1) Overcharge and overdischarge: If the battery is overcharged or overdischarged, it may cause heat to be generated inside the battery, increasing the risk of spontaneous combustion.

[0039] (2) Physical damage: If the battery is hit, squeezed or otherwise physically damaged, it may cause electrolyte leakage and cause spontaneous combustion.

[0040] (3) Overheating: In high temperature environments, battery performance may be affected. Overheating may cause battery failure and increase the risk of spontaneous combustion.

[0041] (4) Manufacturing defects: Defects may exist in the battery manufacturing process, such as uneven electrode coating, improper battery packaging, etc. These defects may cause unstable battery performance and increase the risk of spontaneous combustion.

[0042] When the battery pack thermal runaway event indicates that the main battery pack is thermally runaway, the vehicle speed of the electric vehicle is controlled or waited to be zero.

[0043] Specifically, when the main battery pack thermally runs away, spontaneous combustion usually occurs. Before controlling the main battery pack to detach, it is necessary to control or wait for the speed of the electric vehicle to reach zero to ensure the safety of detachment.

[0044] The main battery pack is controlled to be detached from the electric vehicle, and the backup battery pack is controlled to supply power to the electric vehicle.

[0045] Specifically, the main battery pack that controls thermal runaway is detached from the electric vehicle, and then the backup battery pack is used to power the electric vehicle. The driver can use the power of the backup battery pack to drive the vehicle away from the parking point where the main battery pack is detached.

[0046] Among them, the main battery pack is usually placed under the chassis of the vehicle, which helps to lower the center of gravity of the vehicle, improve stability, maximize the use of the vehicle's interior space, protect the battery from collision or other external damage, and better dissipate heat and cooling; since the main battery pack will pop out from under the vehicle's chassis, the fire may be transmitted to the electric vehicle, so using a backup battery pack to provide power for the vehicle to drive away from the parking point where the main battery pack is detached can improve safety.

[0047] Optionally, monitoring a battery pack thermal runaway event includes:

[0048] One or more of temperature monitoring, voltage monitoring, current monitoring, gas detection, pressure monitoring and infrared thermal imaging are employed for the main battery pack.

[0049] Specifically, the monitoring methods for the main battery pack mainly include:

[0050] (1) Temperature monitoring: Deploy temperature sensors in the battery pack to monitor temperature changes in the battery. If the battery overheats, it may indicate a problem; the temperature monitoring system is usually integrated with the battery management system to monitor and control the temperature in real time.

[0051] (2) Voltage monitoring: By monitoring the voltage of a battery cell or battery pack, the battery charge state and possible faults can be detected; abnormal voltage fluctuations may indicate battery loss of control.

[0052] (3) Current monitoring: Monitor the battery's charge and discharge current to detect any abnormalities; current abnormalities may be caused by internal battery failures.

[0053] (4) Gas detection: Add gas sensors to the battery pack to monitor whether there is gas release that may indicate battery failure, such as smoke, toxic gases, etc.

[0054] (5) Pressure monitoring: For example, pressure sensors detect abnormal pressure changes inside the battery pack.

[0055] (6) Infrared thermal imaging: Infrared thermal imaging technology can monitor the temperature distribution of the battery in real time and help detect areas with abnormal temperature.

[0056] Optionally, when the main battery pack is in thermal runaway, controlling or waiting for the speed of the electric vehicle to reach zero includes:

[0057] If the speed of the electric vehicle is less than the preset speed, wait for the speed of the electric vehicle to reach zero.

[0058] Specifically, combined Figure 2 As shown, when the speed of the electric vehicle is less than a preset speed (eg, 40 km / h), the vehicle computer will sound an alarm, and the driver will pull over by himself (eg, within 1 minute) and wait for the speed of the electric vehicle to return to zero before performing subsequent operations.

[0059] If the speed of the electric vehicle is greater than or equal to the preset speed, the speed of the electric vehicle is controlled to zero.

[0060] Specifically, combined Figure 2 As shown, when the speed of the electric vehicle is greater than or equal to the preset speed (for example, 40 km / h), the vehicle computer alarms. To ensure that the speed drops to zero in time, the driver no longer has to pull over by himself, but instead executes a power battery torque limiting strategy to quickly reduce the speed.

[0061] Optionally, controlling the speed of the electric vehicle to zero includes:

[0062] The power battery torque limiting strategy is activated to reduce the speed of the electric vehicle to zero.

[0063] Specifically, combined Figure 2 As shown in the figure, the power battery torque limiting strategy is a control strategy adopted by the electric vehicle management system to limit the vehicle torque and thus control the vehicle speed. When the vehicle speed needs to be reduced to zero or close to zero, the power battery torque limiting strategy can be implemented in the following ways:

[0064] (1) Reduce the output torque of the motor: By reducing the output torque of the motor, the propulsion force of the vehicle can be gradually reduced, thereby slowing down the vehicle speed.

[0065] (2) Regenerative braking: The power battery torque limiting strategy is usually used in conjunction with a regenerative braking system. Regenerative braking converts the vehicle's kinetic energy into electrical energy and stores it in the battery, thereby slowing the vehicle down and eventually stopping it.

[0066] (3) Electronic stability control system: The vehicle can be stabilized and its speed reduced by braking the wheels individually or reducing the motor torque through an electronic control system.

[0067] Optionally, the electric vehicle further comprises a battery ejection device, and the main battery pack is installed on the electric vehicle through the battery ejection device; and controlling the main battery pack to be separated from the electric vehicle comprises:

[0068] The battery ejection device is activated to eject the main battery pack from the electric vehicle.

[0069] Specifically, combined Figure 2 As shown, when the vehicle speed is zero, the battery ejection device is activated, so that the main battery pack is ejected from the electric vehicle.

[0070] Among them, if the vehicle speed is zero when thermal runaway occurs, the battery ejection device will be directly activated.

[0071] Optionally, the battery ejection device includes a locking device and an energy storage device, and the main battery pack is installed on the electric vehicle through the locking device; activating the battery ejection device to eject the main battery pack from the electric vehicle includes:

[0072] The locking device is controlled to be separated from the main battery pack.

[0073] Specifically, the connection relationship between the main battery pack and the locking device can be in the form of a pin and a slot. The pin is usually attached to the bottom or side of the main battery pack, and the slot is embedded in the locking device. When the main battery pack needs to be released, the locking device can be separated from the main battery pack by pushing or pulling the pin.

[0074] The energy storage device is controlled to eject the main battery pack.

[0075] Specifically, the energy storage device may be a spring or other device with potential energy, and the main battery pack is ejected by the stored potential energy.

[0076] Optionally, the battery thermal runaway treatment method further includes:

[0077] When the main battery pack is in thermal runaway, an alarm is sent to the driver.

[0078] Specifically, combined Figure 2 As shown, when the main battery pack is in thermal runaway, the driver is prompted to perform corresponding operations (such as pulling over) according to the vehicle situation.

[0079] Optionally, the battery thermal runaway treatment method further includes:

[0080] Before the main battery pack is detached from the electric vehicle, a pop-up prompt is sent to the driver.

[0081] Specifically, combined Figure 2 As shown, before the main battery pack leaves the electric vehicle, a pop-up prompt is sent to the driver to inform the driver that the main battery pack is about to pop out, which helps remind the driver to observe the surrounding environment and prevent the main battery pack from causing damage to others or the environment when it pops out.

[0082] Optionally, the battery thermal runaway treatment method further includes:

[0083] When the backup battery pack supplies power to the electric vehicle, a drive-away reminder is sent to the driver.

[0084] Specifically, combined Figure 2 As shown, when the electric vehicle is powered by a backup battery pack, a drive-away prompt is sent to the driver, and the driver drives the electric vehicle away from the parking point where the main battery pack is detached (for example, 100 meters away) and waits for rescue (for example, reporting to a 4S store).

[0085] Another embodiment of the present invention provides a vehicle, including a computer-readable storage medium storing a computer program and a processor, wherein the computer program, when read and executed by the processor, implements the above-mentioned battery thermal runaway handling method.

[0086] Another embodiment of the present invention provides an electronic device, Figure 3As shown, the electronic device includes a central processing unit (CPU) 301, which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 302 or the program loaded from the storage part 308 to the random access memory (RAM) 303. In the RAM 303, various programs and data required for the operation of the electronic device are also stored. The CPU 301, the ROM 302, and the RAM 303 are connected to each other through the bus 304. The input / output (I / O) interface 305 is also connected to the bus 304. In some embodiments, the following components are connected to the I / O interface 305: an input part 306 including a keyboard, a mouse, etc.; an output part 307 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage part 308 including a hard disk, etc.; and a communication part 309 including a network interface card such as a LAN card, a modem, etc. The communication part 309 performs communication processing via a network such as the Internet. The driver 310 is also connected to the I / O interface 305 as needed. Removable media 311, such as magnetic disks, optical disks, magneto-optical disks, semiconductor memories, etc., are installed on drive 310 as needed, so that the computer program read therefrom is installed into storage section 308 as needed. In particular, according to an embodiment of the present invention, the process described with reference to the flowchart above can be implemented as a computer software program. For example, an embodiment of the present invention includes a computer program product, which includes a computer program carried on a machine-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through communication section 309, and / or installed from removable media 311. When the computer program is executed by central processing unit (CPU) 301, the above-mentioned functions defined in the electronic device of the present invention are executed.

[0087] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A battery thermal runaway treatment method, applied to electric vehicles, It is characterized in that The electric vehicle includes a main battery pack and a backup battery pack, and the battery thermal runaway treatment method includes: Monitor battery pack thermal runaway events; When the battery pack thermal runaway event indicates that the main battery pack is thermally runaway, controlling or waiting for the speed of the electric vehicle to reach zero; The main battery pack is controlled to be detached from the electric vehicle, and the backup battery pack is controlled to supply power to the electric vehicle.

2. The battery thermal runaway treatment method according to claim 1, It is characterized in that The monitoring of battery pack thermal runaway events includes: One or more of temperature monitoring, voltage monitoring, current monitoring, gas detection, pressure monitoring and infrared thermal imaging are employed for the main battery pack.

3. The battery thermal runaway treatment method according to claim 1, It is characterized in that When the main battery pack is in thermal runaway, controlling or waiting for the speed of the electric vehicle to reach zero includes: If the speed of the electric vehicle is less than a preset speed, waiting for the speed of the electric vehicle to reach zero; If the speed of the electric vehicle is greater than or equal to the preset speed, the speed of the electric vehicle is controlled to zero.

4. The battery thermal runaway treatment method according to claim 3, It is characterized in that The controlling the speed of the electric vehicle to zero comprises: The power battery torque limiting strategy is activated to reduce the speed of the electric vehicle to zero.

5. The battery thermal runaway treatment method according to claim 1, It is characterized in that The electric vehicle further comprises a battery ejection device, and the main battery pack is installed on the electric vehicle via the battery ejection device; The controlling the main battery pack to be separated from the electric vehicle comprises: The battery ejection device is activated to eject the main battery pack from the electric vehicle.

6. The battery thermal runaway treatment method according to claim 5, It is characterized in that The battery ejection device includes a locking device and an energy storage device, and the main battery pack is installed on the electric vehicle through the locking device; Activating the battery ejection device to eject the main battery pack from the electric vehicle includes: Controlling the locking device to separate from the main battery pack; The energy storage device is controlled to eject the main battery pack.

7. The battery thermal runaway treatment method according to claim 1, It is characterized in that Also includes: When the main battery pack is in thermal runaway, an alarm is sent to the driver.

8. The battery thermal runaway treatment method according to claim 1, It is characterized in that Also includes: Before the main battery pack is detached from the electric vehicle, a pop-up prompt is sent to the driver.

9. The battery thermal runaway treatment method according to claim 1, It is characterized in that Also includes: When the backup battery pack supplies power to the electric vehicle, a drive-away reminder is sent to the driver.

10. A vehicle, It is characterized in that The invention comprises a computer-readable storage medium storing a computer program and a processor, wherein when the computer program is read and executed by the processor, the battery thermal runaway disposal method according to any one of claims 1 to 9 is implemented.

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