Vehicle safety detection system, vehicle safety detection method and vehicle

Abstract

The invention provides a vehicle safety detection system, a vehicle safety detection method and a vehicle. The system comprises a battery pack, the battery pack is a liquid-cooled battery pack, the battery pack comprises a liquid leakage valve, the liquid leakage valve comprises a micro-control switch and a liquid leakage valve cover with a long rod, under the condition that the working state of the liquid leakage valve is an open state, the micro-control switch is separated from the long rod of the liquid leakage valve cover, the working state of the micro-control switch is an electric conduction state, and the liquid leakage valve cover is connected with the micro-control switch. Under the condition that the working state of the liquid leakage valve is a closed state, the micro-control switch is in contact with the long rod of the liquid leakage valve cover, and the working state of the micro-control switch is an electric turn-off state; the battery management system is electrically connected with the power supply through the micro-control switch, when the working state of the micro-control switch is an electric turn-off state, the battery management system and the power supply do not form a transmission path through the micro-control switch, and when the working state of the micro-control switch is an electric turn-on state, the battery management system and the power supply do not form a transmission path through the micro-control switch. And the battery management system and the power supply form a transmission path through the micro-control switch.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a vehicle safety detection system, a vehicle safety detection method, and a vehicle. Background Art

[0002] With the development of science and technology, batteries, as the indispensable energy supply core of modern electronic devices, play a vital role in the normal operation of electronic devices.

[0003] For example, battery packs are key components of new energy vehicles. They generate significant heat during charging and discharging, especially during high power output or rapid charging. Related technologies employ liquid cooling systems within battery packs to control the flow of coolant to remove heat. Due to the complex and ever-changing operating conditions of electric vehicles, battery packs present a risk of coolant leakage. Therefore, some battery packs are equipped with a leak valve to drain any leaked coolant.

[0004] However, during the process of draining the liquid from the leakage valve, the high-pressure environment inside the battery pack is connected to the external environment. If high-pressure operation continues at this time, it will be a serious safety hazard. Summary of the Invention

[0005] In view of this, the embodiments of the present application are directed to providing a vehicle safety detection system, a vehicle safety detection method, and a vehicle.

[0006] In a first aspect, a vehicle safety detection system is provided, the system comprising: a battery pack, the battery pack being a liquid-cooled battery pack, the battery pack comprising a leakage valve, the leakage valve comprising a micro-switch and a leakage valve cover with a long rod, wherein when the leakage valve is in an open state, the micro-switch is separated from the long rod of the leakage valve cover, and the working state of the micro-switch is an electrically conductive state; when the leakage valve is in a closed state, the micro-switch is in contact with the long rod of the leakage valve cover, and the working state of the micro-switch is an electrically closed state; and a battery management system (BMS), the battery management system being electrically connected to a power supply through the micro-switch, wherein when the micro-switch is in an electrically closed state, no transmission path is formed between the battery management system and the power supply through the micro-switch, and when the micro-switch is in an electrically conductive state, a transmission path is formed between the battery management system and the power supply through the micro-switch.

[0007] According to the first aspect, the vehicle includes a vehicle control system, and the battery management system is electrically connected to the vehicle control system. The warning signal sent by the battery management system to the vehicle control system is determined based on the electrical off state or electrical on state of the micro-switch. The warning signal is also used to indicate the warning signal type, and the warning signal type includes one or more of the following: battery pack leakage; battery pack airtight failure.

[0008] According to the first aspect, or any implementation of the first aspect above, the battery management system includes an electronic timing module, which is used to record the conduction time of the micro-switch in the electrically conductive state. The warning signal type is determined according to the conduction time. When the conduction time is greater than the safety time threshold, the warning signal type is battery pack airtight failure.

[0009] According to the first aspect, or any implementation of the first aspect above, the battery pack includes an insulation resistor, and the battery management system includes a monitoring module, which is used to monitor the resistance value of the insulation resistor when the micro-switch is in an electrically conductive state. The warning signal type is determined according to the resistance value of the insulation resistor. When the resistance value of the insulation resistor is less than or equal to the safety resistance value, the warning signal type is battery pack leakage.

[0010] According to the first aspect, or any implementation of the first aspect above, the wake-up state switching of the battery management system is determined based on the electrical conduction state of the micro-switch.

[0011] According to the first aspect, or any implementation of the first aspect above, the micro-switch includes an elastic control. When the elastic control is in a pop-up state, the micro-switch is in an electrically conductive state. When the elastic control is in a closed state, the micro-switch is in an electrically disconnected state.

[0012] According to the first aspect, or any implementation of the first aspect above, the battery pack includes multiple leakage valves, the micro-control switches of the multiple leakage valves are electrically connected in series, and the battery management system and the power supply are electrically connected through the micro-control switches of the multiple leakage valves.

[0013] According to the first aspect, or any implementation of the first aspect above, the leakage valve includes an expansion piece. When the expansion piece absorbs liquid and expands, the micro-switch and the long rod of the leakage valve cover are in a separated state, and the working state of the leakage valve is an open state. When the expansion piece is dry, the micro-switch and the long rod of the leakage valve cover are in a contact state, and the working state of the leakage valve is a closed state.

[0014] In a second aspect, the present application provides a vehicle safety detection method, the vehicle includes a battery pack, a power management system, and a power supply. The battery pack includes a leakage valve, the leakage valve includes a micro-switch and a leakage valve cover with a long rod, and the battery management system is electrically connected to the power supply through the micro-switch. The method includes: determining the electrical shutdown state or electrical conduction state of the micro-switch according to the working state of the leakage valve, wherein, when the working state of the leakage valve is open, the long rod of the leakage valve cover is separated from the micro-switch, and the working state of the micro-switch is electrically conductive; when the working state of the leakage valve is closed, the long rod of the leakage valve cover is in contact with the micro-switch, and the working state of the micro-switch is electrically shut off; according to the electrical shutdown state or electrical conduction state of the micro-switch, controlling whether the battery management system and the power supply form a transmission path, wherein, when the micro-switch is in the electrical shutdown state, the battery management system and the power supply do not form a transmission path through the micro-switch, and when the micro-switch is in the electrical conduction state, the battery management system and the power supply form a transmission path through the micro-switch.

[0015] In a third aspect, the present application provides a car, which includes a vehicle safety detection system provided in the first aspect.

[0016] In a fourth aspect, the present application provides a computer-readable storage medium, which is used for a program code executed by a computer, and the program code includes a vehicle safety detection method for executing the second aspect and any possible implementation of the second aspect.

[0017] In a fifth aspect, an embodiment of the present application provides a computer program comprising commands for executing the vehicle safety detection method in the second aspect and any possible implementation of the second aspect.

[0018] This application sets a micro-switch in the leakage valve. The micro-switch can control the electrical on and off between the battery management system and the power supply according to the opening and closing status of the leakage valve. The battery management system determines the opening and closing status of the leakage valve based on whether the power supply signal is received, so that the working status of the leakage valve can be monitored in real time, thereby improving the safety and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of a vehicle safety detection system provided in an embodiment of the present application.

[0020] Figure 2A A schematic structural diagram of a liquid leakage valve provided in an embodiment of the present application.

[0021] Figure 2B A schematic structural diagram of another liquid leakage valve provided in an embodiment of the present application.

[0022] Figure 2CA schematic structural diagram of another liquid leakage valve provided in an embodiment of the present application.

[0023] Figure 2D A schematic structural diagram of another liquid leakage valve provided in an embodiment of the present application.

[0024] Figure 2E A schematic diagram of a circuit structure including a liquid leakage valve provided in an embodiment of the present application.

[0025] Figure 3 A schematic structural diagram of a micro-switch provided in an embodiment of the present application.

[0026] Figure 4 A flowchart of a battery pack safety detection method provided in an embodiment of the present application.

[0027] Figure 5 A flowchart of another battery pack safety detection method provided in an embodiment of the present application.

[0028] Figure 6 A flowchart of another battery pack safety detection method provided in an embodiment of the present application.

[0029] Figure 7 A schematic diagram of a vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field based on this application are within the scope of protection of this application.

[0031] The term "and / or" in this article is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0032] In the description and claims of the embodiments of this application, the terms "first" and "second" are used to distinguish different objects, rather than to describe a specific order of objects. For example, the terms "first target object" and "second target object" are used to distinguish different objects, rather than to describe a specific order of objects.

[0033] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0034] It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0035] With the development of science and technology, batteries, as the indispensable energy supply core of modern electronic devices, play a vital role in the normal operation of electronic devices. With the continuous advancement of battery technology, such as the development of new battery types such as lithium-ion batteries and solid-state batteries, the application scenarios and scope of batteries are also expanding.

[0036] For example, the use and development of batteries in the field of new energy vehicles is particularly prominent and is developing rapidly. New energy vehicles are electric vehicles powered by battery packs. A battery pack can be understood as a battery system composed of multiple single cells connected in series, parallel, or series-parallel. In the field of new energy vehicles, the battery pack is one of the core key components of new energy vehicles. Heat is generated during the charging and discharging process of the battery pack, especially during high power output or rapid charging, when the heat generated by the battery pack is more significant. Battery pack temperature management is a key part of battery management, which is directly related to the performance, safety, lifespan, and cost control of the battery pack. Related technologies have proposed that a cooling system can be installed in the battery pack to dissipate heat when the temperature of the battery or components is too high. Common cooling systems include: liquid cooling systems, which can quickly absorb and remove heat by controlling the circulation of coolant in pipes or cooling plates, thereby effectively reducing the temperature of the battery pack.

[0037] The complex and ever-changing operating conditions of electric vehicles place higher demands on the performance and safety of battery packs. Some battery pack designs, such as those using ternary materials, carry the risk of coolant leakage due to cooling system failure. Therefore, some packs are equipped with a leak valve to drain leaked coolant.

[0038] The relevant technology cannot detect the draining action of the leakage valve in the battery pack, or in other words, it cannot actively identify the open and closed states of the leakage valve. Therefore, when the leakage valve is open, no prompt signal can be sent to the vehicle, which may cause safety hazards. For example, when the leakage valve cover is opened to drain, it cannot be automatically closed in time. For example, when the leakage valve includes absorbent paper, it is necessary to wait for the absorbent paper inside the leakage valve to naturally dry and shrink in volume before it can automatically close. The time interval between the leakage valve's open state and the closed state is relatively long, and the high-pressure environment inside the battery pack is in a connected state with the external environment. If the battery pack continues to operate at high voltage at this time, it will be a more serious safety hazard.

[0039] In order to solve the above problems, in this application, a micro-switch is set in the leakage valve. The micro-switch can control the electrical on and off between the battery management system and the power supply according to the opening and closing state of the leakage valve. The battery management system determines the opening and closing state of the leakage valve based on whether the power supply signal is received, so that the working state of the leakage valve can be monitored in real time, thereby improving the safety and reliability of the system.

[0040] The following combination Figure 1 , the embodiments of the present application are described in detail.

[0041] Figure 1 This is a schematic diagram of the structure of a vehicle safety detection system provided by an embodiment of the present application. Figure 1 As shown, the vehicle safety detection system 100 may include a battery pack 110 and a battery management system 120 .

[0042] The battery pack 110 may be a liquid-cooled battery pack and may include a liquid leakage valve.

[0043] In some embodiments, the liquid leakage valve may include a micro switch and a liquid leakage valve cover with a long rod. When the liquid leakage valve is opened, the micro switch is separated from the long rod of the liquid leakage valve cover. When the liquid leakage valve is closed, the micro switch contacts the long rod of the liquid leakage valve cover.

[0044] by Figure 2A For example, Figure 2A This is a schematic diagram of the structure of a liquid leakage valve. The liquid leakage valve 6 includes a sealed chamber 2, a micro-switch 8, and a liquid leakage valve cover 7 with a long rod. When the liquid leakage valve 6 is closed, the top of the long rod of the liquid leakage valve cover 7 contacts the micro-switch 8 at the top of the sealed chamber 2. When the liquid leakage valve 6 is opened, the top of the long rod of the liquid leakage valve cover 7 separates from the micro-switch 8 at the top of the sealed chamber 2.

[0045] In some embodiments, a microswitch can be a small switching device. The microswitch can be closed or opened by a small external force. It is understood that when the microswitch is closed, the microswitch is in an electrically conductive state. When the microswitch is open, the microswitch is in an electrically closed state.

[0046] In some embodiments, when the working state of the leakage valve is open, the micro-switch is separated from the long rod of the leakage valve cover, and the working state of the micro-switch is electrically conductive. When the working state of the leakage valve is closed, the micro-switch is in contact with the long rod of the leakage valve cover, and the working state of the micro-switch is electrically off.

[0047] The battery management system 120 can be electrically connected to the power supply via a micro switch, that is, the micro switch can control the electrical connection and disconnection between the battery management system 120 and the power supply.

[0048] For example, when the micro switch is in the off state, the battery management system 120 and the power supply cannot form a transmission path through the micro switch. When the micro switch is in the on state, the battery management system 120 and the power supply can form a transmission path through the micro switch.

[0049] In some embodiments, when the leakage valve is opened, the micro-switch is separated from the long rod of the leakage valve cover, the switch of the micro-switch is closed and is in an electrically conductive state, and when the battery management system 120 and the power supply form a transmission path through the micro-switch, the battery management system 120 can receive the power signal sent by the power supply.

[0050] In some embodiments, when the leakage valve is closed, the micro-switch contacts the long rod of the leakage valve cover, the micro-switch is disconnected and is in an electrically off state, the battery management system 120 and the power supply cannot form a transmission path through the micro-switch, and the battery management system 120 cannot receive the power signal sent by the power supply.

[0051] It is understandable that the leakage valve being in an open state is an abnormal situation. Under normal circumstances, the leakage valve should be in a closed state. The embodiment of the present application proposes that when the leakage valve is open, the micro-switch is electrically conductive, and the power management system obtains the status information of the leakage valve opening by receiving the power signal. Compared with another solution, when the leakage valve is open, the micro-switch is electrically off, and the power management system cannot receive the power signal. The solution of the present application avoids the continuous transmission of the power signal when the leakage valve is closed for a long time, thereby reducing the consumption of power energy.

[0052] In some embodiments, the power source can be a 12V low-voltage power source that comes with the vehicle. Alternatively, the power source can be an external 12V battery. Alternatively, the power source can also be the power source in the battery pack.

[0053] The following combination Figure 2A , the embodiments of the present application are described in detail. Figure 2A The leakage valve shown can be arranged at the bottom of the battery pack.

[0054] like Figure 2A As shown, the leakage valve 6 may include a spring 1, a sealed chamber 2, a blotting paper sheet 3, a hole 4, a sealing ring 5, a leakage valve cover 7, and a micro-switch 8. The micro-switch 8 is located at the top of the sealed chamber 2. The leakage valve cover 7 has a long rod, and the top of the rod contacts the micro-switch 8 when the leakage valve 6 is closed. The rod of the leakage valve cover 7 is provided with several springs 1 in the sealed chamber 2. The leakage valve 6 can be located at the bottom of the battery pack. The micro-switch 8 can be electrically connected to both the power supply and the battery management system.

[0055] When the battery pack leaks, the liquid can flow into the leakage valve 6 through the hole 4. The absorbent paper 3 absorbs the liquid, causing its volume to expand. The expansion of the absorbent paper 3 opens the leakage valve cover 7, allowing excess liquid to flow out through the opened leakage valve cover 7. When the leakage valve cover 7 opens, the long rod of the leakage valve cover 7 moves downward and separates from the micro-switch 8. The micro-switch 8 is then closed and electrically connected. The battery management system forms a transmission path between the battery and the power supply through the micro-switch 8, allowing the battery management system to receive power signals.

[0056] After the leaked liquid flows out of the valve, the absorbent paper 3 naturally dries and shrinks in size, causing the long rod of the valve cover 7 to move upward under the action of the spring 1, closing the valve cover 7. When the valve cover 7 is closed, the long rod of the valve cover 7 moves upward and contacts the micro-switch 8, which then opens and electrically shuts off. The transmission path between the battery management system and the power supply through the micro-switch 8 is disconnected, and the battery management system cannot receive the power signal.

[0057] In some embodiments, the micro switch 8 can be set at different positions of the leakage valve 6. Optionally, the micro switch 8 can be set at the contact position between the leakage valve cover 7 and the bottom of the leakage valve body 6, such as Figure 2B Optionally, the micro switch 8 can be arranged on the upper part of the leakage valve 6, for example, the micro switch 8 can be arranged on the outer top of the sealed cabin 2, as shown. Figure 2C Optionally, the micro switch 8 can be arranged on the outside of the leakage valve 6. For example, the leakage valve cover 7 can also include a long connecting rod 9. The top of the long connecting rod 9 contacts the micro switch 8. Figure 2D shown.

[0058] In some embodiments, as Figure 2E As shown, the micro switch 8 can be electrically connected to the battery management system and the power supply. The micro switch 8 can control the electrical disconnection or electrical conduction of the battery management system and the power supply.

[0059] In this application, by setting a micro-switch in the leakage valve, the micro-switch can control the electrical conduction or electrical disconnection between the battery management system and the power supply according to the opening and closing state of the leakage valve. The battery management system determines the opening and closing state of the leakage valve based on whether the power supply signal is received, so that the working state of the leakage valve can be monitored in real time, thereby improving the safety and reliability of the system.

[0060] In some embodiments, the micro-switch may include a spring control. The micro-switch can control the closing or opening of the switch according to the spring control. The operating state of the spring control can be divided into a spring-up state and a closed state. For example, when the spring control is in the spring-up state, the micro-switch is in the closed state, and when the spring control is in the closed state, the micro-switch is in the open state.

[0061] In some embodiments, when the leakage valve is closed, the elastic component of the micro switch is in a closed state due to the action of the long rod of the leakage valve cover. When the leakage valve is opened, the long rod of the leakage valve cover is separated from the micro switch, and the elastic component loses the external force and is in a spring-up state. Figure 3 For example, the elastic control 8-1 can be in a closed state or a popped-up state depending on whether it is affected by external force.

[0062] In some embodiments, the microswitch can determine whether it is in an electrically OFF state or an electrically ON state by detecting changes in the state of the contact control. When the elastic control is in the pop-up state, the microswitch is disconnected and the operating state of the microswitch is the electrically ON state. When the elastic control is in the closed state, the microswitch is closed and the operating state of the microswitch is the electrically OFF state.

[0063] Combine Figure 2A and Figure 3 When the leakage valve cover is closed, the micro-switch 8 contacts the long rod of the leakage valve cover 7. The contact element 8-1 of the micro-switch is in a closed state due to the external force of the long rod. At this time, the micro-switch is in an electrically OFF state. When the leakage valve cover is opened, the micro-switch 8 separates from the long rod of the leakage valve cover 7. The contact element 8-1 of the micro-switch is no longer in an external force and is in a popped-up state. At this time, the micro-switch is in an electrically ON state.

[0064] In some embodiments, the leakage valve may further include an expansion member. The expansion member may be Figure 2A The absorbent paper in the 3.

[0065] In some embodiments, when the expansion element absorbs liquid and expands, the micro-switch and the long rod of the leakage valve cover are separated, and the leakage valve is in an open state. When the expansion element is dry, the micro-switch and the long rod of the leakage valve cover are in contact, and the leakage valve is in a closed state.

[0066] by Figure 2A For example, the expansion member can be an absorbent paper sheet 3. A leakage valve 6 can be located at the bottom of the battery pack. When the battery pack leaks, liquid flows into the leakage valve 6. The absorbent paper sheet 3 absorbs the liquid, expanding its volume, and the leakage valve cover 7 opens due to the expansion of the absorbent paper sheet 3. After the leaked liquid flows out, the absorbent paper sheet 3 naturally dries and shrinks in volume, causing the long rod of the leakage valve cover 7 to move upward under the action of the spring 1, closing the leakage valve cover 7.

[0067] It's understandable that in a leak valve, the expansion element rapidly absorbs and expands upon contact with liquid. This rapid volume change immediately triggers the valve to open, improving the sensitivity of the valve's status detection. After the leaked liquid is expelled, the time it takes for the expansion element to dry and shrink varies depending on the environment. To ensure the proper functioning of the leak valve and maintain a safe operating environment for the battery pack, real-time monitoring of the valve's status is necessary.

[0068] In some embodiments, the vehicle may include a vehicle control system, and the battery management system may be electrically connected to the vehicle control system.

[0069] In some embodiments, the battery management system can send an early warning signal to the vehicle control system to ensure that the vehicle control system receives an early warning when the leakage valve is opened, so that the vehicle control system can take relevant measures in advance to avoid safety problems caused by the opening of the leakage valve.

[0070] In some embodiments, the warning signal may be determined based on an electrically OFF state or an electrically ON state of the micro switch.

[0071] For example, when the leakage valve is open and the microswitch is electrically conductive, a transmission path between the battery management system and the power supply can be established through the microswitch. At this time, the battery management system can receive the power signal sent by the power supply. When the battery management system receives the power signal, it can send a warning signal to the vehicle control system.

[0072] For example, when the leakage valve is in the closed state, the micro-switch is electrically turned off, and the battery management system and the power supply cannot form a transmission path through the micro-switch. At this time, the battery management system cannot receive the power signal sent by the power supply, and the battery management system will not send a warning signal to the vehicle control system.

[0073] In some embodiments, to improve the accuracy of the warning, the warning signal sent by the battery management system to the vehicle control system can also be used to indicate the warning signal type. After receiving the power signal, the battery management system can determine the warning signal type in combination with other conditions.

[0074] Exemplarily, the warning signal type may include one or more of the following: battery pack leakage; battery pack airtight failure.

[0075] In some embodiments, the battery management system may include an electronic timing module. When the leakage valve is open, the micro-switch is electrically conductive, and the battery management system receives a power signal, the battery management system may activate the electronic timing module to measure the duration of time the micro-switch is electrically conductive.

[0076] In some embodiments, the warning signal type may be determined based on the conduction duration. For example, if the conduction duration is greater than a safety time threshold, the warning signal type may be a battery pack airtight failure.

[0077] In some embodiments, the safety time threshold can be understood as a threshold at which the battery pack can safely operate with the leakage valve open. Optionally, the safety time threshold can be 24 hours.

[0078] In some embodiments, when the conduction duration exceeds the safety time threshold, it can be understood that the duration the leakage valve has been open has exceeded the time threshold for the leakage valve to operate safely in the open state. At this time, it can be considered that the battery pack is at risk of airtight failure. The battery management system can indicate the warning signal type as battery pack airtight failure in the warning signal sent to the vehicle control system. After receiving the warning signal, the vehicle control system can take relevant measures based on the problem of battery pack airtight failure to avoid a series of safety issues caused by airtight failure due to the prolonged opening of the leakage valve.

[0079] In some embodiments, the conduction time starts to be calculated after the battery management system receives the power signal, stops to be calculated and reset to zero when the battery management system cannot receive the power signal, and restarts the timing when the power signal is received next time.

[0080] In some embodiments, when the on-time exceeds a safety time threshold, the battery management system sends a warning signal to the vehicle control system. Upon receiving the warning signal, the vehicle control system can send a stop timer signal to the battery management system. When the battery management system receives the stop timer signal, the electronic timing module stops timing, resets the on-time to zero, and restarts timing the next time it receives a power signal.

[0081] The battery management system in the embodiment of the present application can receive a power signal by electrically conducting via a micro-switch after the leakage valve is opened. After receiving the power signal, the battery management system can determine whether the warning signal type is a battery pack airtight failure based on whether the conduction duration exceeds the safety time threshold. This design can avoid misjudging the leakage valve status and improve the accuracy of the warning. At the same time, the vehicle control system can take relevant measures based on the warning signal type to avoid potential safety issues.

[0082] In some embodiments, the battery pack may include an insulation resistor, and the battery management system may include a monitoring module. The monitoring module may be configured to monitor the resistance value of the insulation resistor when the micro-switch is in an electrically conductive state.

[0083] In some embodiments, the insulation resistance value may be a resistance in the traditional sense, for example, the insulation resistance value may be 1000 ohms (Ω). Alternatively, the insulation resistance value may be a specific indicator for evaluating the insulation performance of a battery pack at different voltages, for example, the insulation resistance value may be 1000 ohms per volt (Ω / V).

[0084] In some embodiments, the battery management system can determine whether there is leakage in the battery pack by detecting the insulation resistance value, and thus assess whether there are serious safety hazards in the battery pack, such as leakage risk. For example, when the battery pack leaks, the leakage may form a conductive path within the battery pack, causing the insulation resistance value to drop significantly, thereby creating a leakage risk.

[0085] In some embodiments, when the battery management system receives a power signal based on the microswitch's electrical conduction and then sends a warning signal to the vehicle control system, it can determine the warning signal type based on the insulation resistance value. For example, if the insulation resistance value is less than or equal to the safety resistance value, the warning signal type may be a battery pack leakage.

[0086] In some embodiments, the safety resistance value may be related to the voltage of the battery pack. Due to the different types of vehicles, the voltages of the battery packs included in the vehicles are also different. For example, the battery pack voltage of a family car is different from that of a commercial vehicle, such as an electric bus. Since commercial vehicles require higher power output and greater mileage, the battery pack voltage of a commercial vehicle is usually higher than that of a family car. Due to the different battery pack voltages of different vehicles, the resistance values ​​of the insulation resistors in different battery packs are also different. The safety resistance value of the insulation resistance resistor can be adjusted according to the battery pack voltage to ensure that the battery packs of different vehicles can effectively determine the type of warning signal.

[0087] In some embodiments, when the insulation resistance exceeds the safety resistance, it can be understood that even when the leakage valve is open, there is still a lot of leakage in the battery pack, which has begun to affect the insulation resistance. At this time, it can be considered that the battery pack is at risk of leakage. The battery management system can indicate that the warning signal type is battery pack leakage in the warning signal sent to the vehicle control system. After receiving the warning signal, the vehicle control system can take relevant measures based on the battery pack leakage problem to avoid safety problems caused by airtight failure due to the leakage valve being open for a long time.

[0088] The battery management system in the embodiment of the present application can receive a power signal by electrically conducting the microswitch after the leakage valve is opened. After receiving the power signal, the battery management system can determine whether the warning signal type is a battery pack leakage based on whether the insulation resistance value exceeds the safe resistance value. This design can promptly detect safety issues caused by excessive leakage in the battery pack, effectively prevent potential safety hazards, ensure the safe operation of the battery pack, and improve the accuracy of warnings. At the same time, the vehicle control system can take relevant measures based on the warning signal type to avoid potential safety issues.

[0089] In some embodiments, the type of the warning signal can be determined based on the duration of the micro-switch electrical conduction and the resistance value of the insulation resistor.

[0090] For example, the battery management system receives a power signal based on the microswitch's electrical conduction. If the duration of the microswitch's electrical conduction exceeds a safety time threshold, and the insulation resistance value is less than or equal to the safety resistance value, the battery pack is considered to be leaking seriously, and the warning signal type may be battery pack leakage. If the insulation resistance value is greater than the safety resistance value, the warning signal type may be battery pack airtightness failure.

[0091] For example, the battery management system receives a power signal based on the microswitch's electrical conduction. If the duration of the microswitch's electrical conduction is less than or equal to the safety time threshold, and the insulation resistance value is less than or equal to the safety resistance value, the battery pack is considered to have a transient leakage, and the warning signal type is battery pack leakage. If the insulation resistance value is greater than the safety resistance value, the battery pack is considered to be in a normal state. At this point, the battery management system can continue to send a warning signal to the vehicle control system, and the warning signal type may be that the leakage valve is open.

[0092] Below Figure 4 As an example, the embodiments of the present application are described in detail.

[0093] Figure 4 This is a vehicle safety detection method proposed in an embodiment of the present application, which includes steps S410 to S450.

[0094] Step S410: The vehicle is in a powered-on state. When the vehicle is in a powered-on state, the battery management system may be in an awake state.

[0095] Step S420: When the leakage valve is in the closed state, the micro-switch is electrically disconnected.

[0096] When the liquid leakage valve is in a closed state, the micro-switch of the liquid leakage valve contacts the long rod of the liquid leakage valve cover, and the micro-switch is in an electrically off state.

[0097] When leakage occurs in the battery pack, the process may jump to step S430 .

[0098] Step S430: When the leakage valve is in the open state, the micro-switch is electrically turned on.

[0099] When the leakage valve is in the open state, the micro-switch of the leakage valve and the long rod of the leakage valve cover are separated, the micro-switch is in the electrically conductive state, and the battery management system can form a transmission path with the power supply through the micro-switch.

[0100] Step S440: The battery management system receives a power signal.

[0101] When the battery management system can form a transmission path with the power supply through the micro switch, the battery management system can receive the power supply signal. The power supply can be a 12V low-voltage power supply.

[0102] In step S450 , the battery management system may comprehensively determine the type of the warning signal based on the conduction duration and the insulation resistance value.

[0103] When the battery management system receives the power signal, the battery management system can determine the type of the warning signal based on the conduction time of the micro-switch and / or the resistance value of the insulation resistor in the battery pack.

[0104] Optionally, when the conduction time is longer than the safety time threshold, the warning signal type may be battery pack airtight failure.

[0105] Optionally, when the insulation resistance value is less than or equal to the safety resistance value, the warning signal type may be battery pack leakage.

[0106] Optionally, when the microswitch remains on for a duration greater than a safety time threshold, and the insulation resistance value is less than or equal to the safety resistance value, the battery pack may be considered to be leaking seriously, and the warning signal may be a battery pack leakage warning. If the insulation resistance value is greater than the safety resistance value, the warning signal may be a battery pack airtight failure warning.

[0107] Optionally, when the duration of the microswitch's electrical conduction is less than or equal to a safety time threshold, and the insulation resistance value is less than or equal to a safety resistance value, it can be considered that the battery pack has a transient leakage, and the warning signal type is battery pack leakage. If the insulation resistance value is greater than the safety resistance value, it can be considered that the battery pack is in a normal state.

[0108] The warning signal sent by the battery management system to the vehicle control system can also indicate the warning signal type. The warning signal type can be determined by the battery management system after receiving the power signal and combining other conditions. This design improves the accuracy of the warning. At the same time, the vehicle control system can take relevant measures based on the warning signal type to avoid safety issues caused by the open leakage valve.

[0109] In some embodiments, the battery management system's wake-up state is determined based on the electrical conduction state of a microswitch. For example, if the vehicle is powered off (i.e., stationary), the battery management system is in a dormant state. If the battery pack leaks, the leak valve opens, turning on the microswitch. The battery management system can establish a transmission path with the power supply via the microswitch and be triggered to wake up by receiving a power signal.

[0110] In some embodiments, when the battery management system is triggered to wake up by the power signal, it can send a warning signal to the vehicle control system. The vehicle control system can wake up upon receiving the warning signal and report the warning signal of the leakage valve opening to the user through the communication module.

[0111] In some embodiments, after the battery management system is triggered to wake up by the power signal, it can continuously monitor the status of the leakage valve and send a warning signal to the vehicle control system in a timely manner when the vehicle is powered on.

[0112] In some embodiments, after the battery management system is awakened by a power signal, it can continuously monitor the status of the leakage valve. When the leakage valve is closed, the micro-switch is electrically turned off, and the battery management system cannot receive a power signal, it can continue to enter a sleep state.

[0113] by Figure 5 For example, Figure 5 This is a vehicle safety detection method proposed in an embodiment of the present application, which includes steps S510 to S550.

[0114] In step S510, the battery management system is in a dormant state, which can also be considered as the vehicle being powered off.

[0115] Step S520: When the leakage valve is in the closed state, the micro-switch is electrically disconnected.

[0116] When the liquid leakage valve is in a closed state, the micro-switch of the liquid leakage valve contacts the long rod of the liquid leakage valve cover, and the micro-switch is in an electrically off state.

[0117] When leakage occurs in the battery pack, the process may jump to step S530 .

[0118] Step S530: When the leakage valve is in the open state, the micro-switch is electrically turned on.

[0119] When the leakage valve is in the open state, the micro-switch of the leakage valve and the long rod of the leakage valve cover are separated, the micro-switch is in the electrically conductive state, and the battery management system can form a transmission path with the power supply through the micro-switch.

[0120] Step S540: After receiving the power signal, the battery management system wakes up from the sleep state.

[0121] When the battery management system can form a transmission path with the power supply through the micro-switch, the battery management system can receive a power signal. After receiving the power signal, the battery management system can wake up from a dormant state.

[0122] Optionally, the power supply may be a 12V low voltage power supply.

[0123] Step S550: After waking up, the battery management system sends a warning signal to the vehicle control system.

[0124] In this application, if the battery management system is in a dormant state, its awakening state can be determined based on the electrical conduction state of the microswitch. This design ensures that the operating status of the leakage valve can be promptly obtained in any vehicle state and the status of the leakage valve can be monitored in real time, avoiding more serious safety issues and ensuring vehicle safety.

[0125] In some embodiments, the battery pack may include multiple leakage valves. For example, the micro-switches of the multiple leakage valves may be electrically connected in series. The battery management system and the power supply are electrically connected through the micro-switches of the multiple leakage valves. In other words, when any of the multiple micro-switches is electrically turned off or turned on, it will affect whether the battery management system can form a transmission path with the power supply. Using this approach in hardware design can reduce the overhead of individually monitoring each leakage valve, which is more cost-effective.

[0126] The above describes the system embodiment of the present application in detail. Based on the above content, the present application also proposes a vehicle safety detection method. Figure 6 The method embodiment of the present application is described in detail. It should be understood that the description of the above system embodiment corresponds to the description of the method embodiment, so for parts not described in detail, reference can be made to the above system embodiment.

[0127] Figure 6 A vehicle safety detection method provided in an embodiment of the present application may include steps S610 and S620.

[0128] Step S610: determining the electrical off state or electrical on state of the micro switch according to the working state of the leakage valve.

[0129] In some embodiments, when the working state of the leakage valve is open, the long rod of the leakage valve cover is separated from the micro-switch, and the working state of the micro-switch is electrically conductive. When the working state of the leakage valve is closed, the long rod of the leakage valve cover is in contact with the micro-switch, and the working state of the micro-switch is electrically off.

[0130] Step S620 , controlling whether a transmission path is formed between the battery management system and the power source according to the electrical off state or the electrical on state of the micro-switch.

[0131] In some embodiments, when the micro switch is in an electrically off state, the battery management system and the power supply do not form a transmission path through the micro switch; when the micro switch is in an electrically on state, the battery management system and the power supply form a transmission path through the micro switch.

[0132] Optionally, the vehicle may include a vehicle control system, and the battery management system may be electrically connected to the vehicle control system. The battery management system may send a warning signal to the vehicle control system based on the electrical off state or electrical on state of the micro-switch. The warning signal may also be used to indicate the warning signal type, which may include one or more of the following: battery pack leakage; battery pack airtight failure.

[0133] Optionally, the battery management system may include an electronic timing module, which can be used to record the conduction time of the micro switch in the electrical conduction state. The warning signal type can be determined based on the conduction time. When the conduction time is greater than the safety time threshold, the warning signal type may be a battery pack airtight failure.

[0134] Optionally, the battery pack may include an insulation resistor, and the battery management system may include a monitoring module. The monitoring module may be used to monitor the resistance value of the insulation resistor when the microswitch is in an electrically conductive state. The warning signal type may be determined based on the resistance value of the insulation resistor. When the resistance value of the insulation resistor is less than or equal to the safety resistance value, the warning signal type may be battery pack leakage.

[0135] Optionally, the wake-up state switching of the battery management system may be determined based on the electrical conduction state of the micro-switch.

[0136] Optionally, the micro switch may include an elastic control. When the elastic control is in a pop-up state, the micro switch may be in an electrically conductive state. When the elastic control is in a closed state, the micro switch may be in an electrically disconnected state.

[0137] Optionally, the battery pack may include multiple leakage valves, and the micro-switches of the multiple leakage valves are electrically connected in series. The battery management system can be electrically connected to the power supply through the micro-switches of the multiple leakage valves.

[0138] Optionally, the leakage valve may include an expansion piece. When the expansion piece absorbs liquid and expands, the micro-switch and the long rod of the leakage valve cover are in a separated state, and the working state of the leakage valve may be an open state. When the expansion piece is dry, the micro-switch and the long rod of the leakage valve cover are in a contact state, and the working state of the leakage valve may be a closed state.

[0139] like Figure 7 As shown, an embodiment of the present application further proposes a car, which may include the vehicle safety detection system mentioned in the above embodiment.

[0140] In addition, an embodiment of the present application also proposes a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a computer, the operations in the vehicle safety detection method provided in the above embodiment are implemented. The specific steps will not be repeated here.

[0141] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity / operation / object from another entity / operation / object, and do not necessarily require or imply any actual relationship or order between these entities / operations / objects; the terms "include", "comprise", or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or system that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "includes a ..." does not exclude the presence of other identical elements in the process, method, article, or system that includes the element.

[0142] As for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple. For relevant details, please refer to the partial description of the method embodiment. The device embodiment described above is merely illustrative, and the units described as separate components may or may not be physically separated. Some or all of the modules can be selected according to actual needs to achieve the purpose of the present application scheme. Those of ordinary skill in the art can understand and implement it without paying any creative work.

[0143] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0144] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several commands for enabling a terminal device (which can be a mobile phone, computer, server, TV, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0145] The above are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A vehicle safety detection system, characterized in that: include: A battery pack, wherein the battery pack is a liquid-cooled battery pack, the battery pack includes a leakage valve, the leakage valve includes a micro-switch and a leakage valve cover with a long rod, when the leakage valve is in an open state, the micro-switch is separated from the long rod of the leakage valve cover, and the working state of the micro-switch is an electrically conductive state; when the leakage valve is in a closed state, the micro-switch is in contact with the long rod of the leakage valve cover, and the working state of the micro-switch is an electrically closed state; A battery management system, wherein the battery management system is electrically connected to the power supply through the micro-switch. When the working state of the micro-switch is an electrically off state, the battery management system and the power supply do not form a transmission path through the micro-switch. When the working state of the micro-switch is an electrically on state, the battery management system and the power supply form a transmission path through the micro-switch.

2. The system according to claim 1, wherein: The vehicle includes a vehicle control system, the battery management system is electrically connected to the vehicle control system, the warning signal sent by the battery management system to the vehicle control system is determined based on the electrical off state or electrical on state of the micro switch, and the warning signal is further used to indicate a warning signal type, and the warning signal type includes one or more of the following: The battery pack leaks; The battery pack fails to be airtight.

3. The system according to claim 2, characterized in that The battery management system includes an electronic timing module, which is used to record the conduction time of the micro switch in the electrical conduction state. The warning signal type is determined according to the conduction time. When the conduction time is greater than the safety time threshold, the warning signal type is that the battery pack airtightness fails.

4. The system according to claim 2, wherein: The battery pack includes an insulation resistor, and the battery management system includes a monitoring module. The monitoring module is used to monitor the resistance value of the insulation resistor when the micro-switch is in an electrically conductive state. The early warning signal type is determined according to the resistance value of the insulation resistor. When the resistance value of the insulation resistor is less than or equal to the safety resistance value, the early warning signal type is that the battery pack is leaking.

5. The system according to claim 1, wherein: The wake-up state switching of the battery management system is determined based on the electrical conduction state of the micro-switch.

6. The system according to claim 1, wherein: The micro switch includes an elastic control. When the elastic control is in a pop-up state, the micro switch is in an electrically conductive state. When the elastic control is in a closed state, the micro switch is in an electrically disconnected state.

7. The system according to claim 1, wherein: The battery pack includes a plurality of leakage valves, the micro-switches of the plurality of leakage valves are electrically connected in series, and the battery management system is electrically connected to the power supply through the micro-switches of the plurality of leakage valves.

8. The system according to claim 1, wherein: The liquid leakage valve includes an expansion piece. When the expansion piece absorbs liquid and expands, the micro-switch and the long rod of the leakage valve cover are in a separated state, and the working state of the liquid leakage valve is an open state. When the expansion piece is dry, the micro-switch and the long rod of the leakage valve cover are in a contact state, and the working state of the liquid leakage valve is a closed state.

9. A vehicle safety detection method, characterized in that: The vehicle includes a battery pack, a power management system, and a power supply. The battery pack includes a leakage valve, which includes a micro-switch and a leakage valve cover with a long rod. The battery management system is electrically connected to the power supply via the micro-switch. The method includes: determining an electrically off state or an electrically on state of the micro-switch according to the working state of the liquid leakage valve, wherein when the working state of the liquid leakage valve is an open state, the long rod of the liquid leakage valve cover is separated from the micro-switch, and the working state of the micro-switch is an electrically on state; and when the working state of the liquid leakage valve is a closed state, the long rod of the liquid leakage valve cover is in contact with the micro-switch, and the working state of the micro-switch is an electrically off state; Whether the battery management system and the power supply form a transmission path is controlled according to the electrically off state or the electrically on state of the micro-switch. When the micro-switch is in the electrically off state, the battery management system and the power supply do not form a transmission path through the micro-switch. When the micro-switch is in the electrically on state, the battery management system and the power supply form a transmission path through the micro-switch.

10. A vehicle, characterized in that: The vehicle includes a vehicle safety detection system as described in any one of claims 1-8.

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