Safety detection method of battery pack, safety detection system of vehicle and vehicle

Abstract

The invention provides a safety detection method of a battery pack, a safety detection system of a vehicle and the vehicle, the battery pack is electrically connected with a battery management system, the battery pack is a liquid-cooled battery pack, the battery pack comprises a liquid leakage valve, the liquid leakage valve comprises an interlocking structure, the interlocking structure comprises a micro-control part and a liquid leakage valve cover with a long rod, and the micro-control part is electrically connected with the long rod. The method comprises the steps that when a micro-control component detects that a long rod of a liquid leakage valve cover is separated from the micro-control component, the micro-control component sends a first interlocking signal to a battery management system, and the first interlocking signal indicates that a liquid leakage valve is in an open state; and when the micro-control component detects that the long rod of the liquid leakage valve cover is in contact with the micro-control component, the micro-control component sends a second interlocking signal to the battery management system, and the second interlocking signal indicates that the liquid leakage valve is in a closed state. The opening and closing state of the liquid leakage valve is determined through the relative position relation of the micro-control component and the long rod, the problem that the opening and closing state of a traditional liquid leakage valve cannot be actively recognized is solved, and the safety and reliability of a system are improved.

Description

Technical Field

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

[0003] For example, the use and development of batteries in the field of new energy vehicles are particularly prominent and are developing rapidly. New energy vehicles are electric vehicles whose power source is provided by battery packs. In the field of new energy vehicles, battery packs are 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 fast charging, the heat generated by the battery pack is more significant. In the prior art, a liquid cooling system is usually set in the battery pack to control the flow of coolant to achieve the purpose of taking away heat. The liquid cooling system is usually composed of coolant pipes, seals, cooling plates and other components. When the electric vehicle is driving, due to the complex operating conditions of the electric vehicle, the liquid cooling system may fail to seal the coolant pipes, seals, cooling plates and other components due to various factors such as mechanical vibration and temperature changes, thereby causing leakage.

[0004] Currently, battery packs with liquid cooling systems can be equipped with a leak valve. The valve's primary function is to drain leaked liquid from the battery pack to prevent accumulation. However, due to limitations in its design and mechanical structure, traditional leak valves are unable to detect whether the valve is open or closed. When the valve is open, the battery pack communicates with the outside world. If the battery pack continues to operate at high voltage, this poses a serious safety hazard. Summary of the Invention

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

[0006] In a first aspect, a safety detection method for a battery pack is provided, wherein the battery pack is electrically connected to a battery management system (BMS), the battery pack is a liquid-cooled battery pack, the battery pack includes a leakage valve, the leakage valve includes an interlocking structure, the interlocking structure includes a micro-control component and a leakage valve cover with a long rod, the method comprising: when the micro-control component detects that the long rod of the leakage valve cover is separated from the micro-control component, the micro-control component sends a first interlock signal to the battery management system, the first interlock signal indicating that the leakage valve is in an open state; when the micro-control component detects that the long rod of the leakage valve cover is in contact with the micro-control component, the micro-control component sends a second interlock signal to the battery management system, the second interlock signal indicating that the leakage valve is in a closed state.

[0007] According to the first aspect, the micro-control component includes a contact control, which is an elastic control. When the micro-control component detects that the long rod of the leakage valve cover is separated from the micro-control component, the micro-control component sends a first interlock signal to the battery management system, including: when the micro-control component detects that the contact control pops up, the micro-control component sends a first interlock signal to the battery management system; when the micro-control component detects that the long rod of the leakage valve cover is in contact with the micro-control component, the micro-control component sends a second interlock signal to the battery management system, including: when the micro-control component detects that the contact control is closed, the micro-control component sends a second interlock signal to the battery management system.

[0008] According to the first aspect, or any implementation of the first aspect above, the battery pack is placed in a vehicle, and the vehicle includes a vehicle control system. The method also includes: when the battery management system receives the first interlock signal, the battery management system sends a warning signal to the vehicle control system.

[0009] According to the first aspect, or any implementation of the first aspect above, the battery management system includes an electronic timing module. When the battery management system receives a first interlock signal, the battery management system sends a warning signal to the vehicle control system, including: after the battery management system receives the first interlock signal, starting the electronic timing module to start timing and generate a first timing time; when the first timing time exceeds a safety time threshold, the battery management system sends a warning signal to the vehicle control system.

[0010] According to the first aspect, or any implementation of the first aspect above, the battery pack includes an insulation resistance value, and when the battery management system receives the first interlock signal, the battery management system sends a warning signal to the vehicle control system, including: when the battery management system receives the first interlock signal, the battery management system measures the insulation resistance value through the monitoring module; the battery management system determines whether to send a warning signal to the vehicle control system based on the first warning condition, and the first warning condition includes the insulation resistance value being within the resistance warning range, and the resistance warning range is related to the voltage of the battery pack.

[0011] According to the first aspect, or any implementation method of the first aspect above, the resistance warning range includes multiple sub-intervals, and the multiple sub-intervals correspond to different warning levels. The battery management system determines whether to issue a warning signal to the vehicle control system based on the first warning condition, including: when the battery management system determines that the insulation resistance value is within the sub-interval, a warning signal is issued to the vehicle control system, and the warning signal includes the warning level corresponding to the sub-interval; when the warning signal is sent, the vehicle control strategy is determined according to the warning level; and the vehicle is controlled according to the control strategy.

[0012] According to the first aspect, or any implementation of the first aspect above, the control strategy includes one or more of the following operations: controlling the battery management system not to enter a sleep state; limiting the output power of the battery pack; and cutting off the connection between the battery pack and the vehicle's high-voltage circuit.

[0013] According to the first aspect, or any implementation of the first aspect above, the micro-control component contacts the side surface of the long rod of the leakage valve cover, and the method also includes: when the long rod of the leakage valve cover moves downward relative to the micro-control component, the micro-control component sends a first interlock signal to the battery management system.

[0014] In the second aspect, the present application provides a vehicle safety detection system, which includes: a battery pack, which is a liquid-cooled battery pack, the battery pack includes a leakage valve, the leakage valve includes an interlocking structure, and the interlocking structure includes a micro-control component and a leakage valve cover with a long rod; a battery management system, which is electrically connected to the battery pack, wherein the micro-control component is used to detect that when the long rod of the leakage valve cover is separated from the micro-control component, it sends a first interlock signal to the battery management system, and the micro-control component is also used to detect that when the long rod of the leakage valve cover is in contact with the micro-control component, it sends a second interlock signal to the battery management system, the first interlock signal indicates that the leakage valve is in an open state, and the second interlock signal indicates that the leakage valve is in a closed state.

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

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

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

[0018] The present application solves the problem that traditional leakage valves cannot actively identify their own opening and closing states by setting an interlocking structure (including a micro-control component and a leakage valve cover with a long rod) in the leakage valve, and uses the relative position relationship between the micro-control component and the long rod to determine the opening and closing state of the leakage valve. At the same time, the application reports the state to the battery management system in real time, and can monitor the state information of the leakage valve in real time, thereby improving the safety and reliability of the system and reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A flowchart of a battery pack safety detection method 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 2C A 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 structural diagram of another liquid leakage valve provided in an embodiment of the present application.

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

[0026] Figure 4 A flowchart of another 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 schematic structural diagram of a vehicle safety detection system 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 are particularly prominent and are developing rapidly. New energy vehicles are electric vehicles whose power source is provided by battery packs. A battery pack can be understood as a combination of multiple single cells in series, parallel or series-parallel to form an overall battery system. 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 fast charging, the heat generated by the battery pack is more significant. The temperature management of the battery pack is an important part of battery management, which is directly related to the performance, safety, life and cost control of the battery pack. Related technologies have proposed that a liquid cooling system can be set in the battery pack to quickly absorb and take away heat by controlling the flow of coolant, thereby effectively reducing the temperature of the battery pack.

[0037] Liquid cooling systems typically consist of coolant pipes, seals, cooling plates, and other components. While electric vehicles are driving, due to the complex operating conditions of electric vehicles, the liquid cooling system may experience seal failure in these components due to mechanical vibrations, temperature fluctuations, and other factors, leading to leakage. For example, battery packs such as ternary square shells currently on the market typically use liquid cooling systems to dissipate heat. These systems contain numerous coolant pipes, seals, and cooling plates, with numerous connection points between these components, necessitating very high sealing requirements. Mechanical vibrations such as road bumps, sudden acceleration, or sudden braking while driving can cause the pipes in the liquid cooling system to loosen, seals to become damaged, or cooling plates to deform, leading to leakage. As coolant accumulates within the battery pack casing, the insulation performance of the battery modules within can degrade. In severe cases, a short circuit can occur, leading to safety incidents such as combustion and fire in the entire battery pack.

[0038] Based on the above problems, in the current market, battery pack products with liquid cooling systems can be equipped with leakage valves. The main function of the leakage valve is to discharge the leaked liquid in the battery pack to prevent the liquid from accumulating in the battery pack. However, due to the limitations of its design principle and mechanical structure, the traditional leakage valve cannot identify the open or closed state of the valve. For example, the leakage valve can be set at the bottom of the battery pack, and the leakage valve includes a water-absorbing paper sheet. When leakage occurs in the battery pack, the liquid can flow in through the holes of the leakage valve. After the water-absorbing paper sheet absorbs the liquid, its volume expands and the leakage valve cover can be pushed open. At this time, the excess liquid can flow out from the opened leakage valve cover. After all the liquid in the battery pack has flowed out, the leakage valve cannot be closed in time. It is necessary to wait until the water-absorbing paper sheet evaporates naturally and its volume shrinks before the leakage valve cover is closed. Therefore, the above leakage valve only relies on the expansion or contraction of the volume of the water-absorbing paper sheet to control the opening or closing of the leakage valve cover, and cannot actively identify the open or closed state of the valve. If the vehicle is constantly in a humid environment, even if the leaked liquid in the battery pack has been completely drained, the absorbent paper will remain damp and unable to shrink, causing the leak valve cover to remain open for a long time. When the leak valve is open, there is a channel connecting the battery pack to the outside world. If the battery pack continues to operate at high voltage, it will pose a serious safety hazard.

[0039] In order to solve the above problems, in the present application, an interlocking structure (including a micro-control component and a leakage valve cover with a long rod) is set in the leakage valve, and the relative position relationship between the micro-control component and the long rod is used to determine the opening and closing state of the leakage valve, thereby solving the problem that the traditional leakage valve cannot actively identify its own opening and closing state. At the same time, the state is reported to the battery management system in real time, and the status information of the leakage valve can be monitored in real time, thereby improving the safety and reliability of the system and reducing maintenance costs.

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

[0041] Figure 1 This is a flow chart of a battery pack safety detection method provided in an embodiment of the present application to solve the above problems.

[0042] Figure 1 The illustrated method can be applied to a vehicle, which can be an electric vehicle. The battery pack can be electrically connected to a battery management system, and the battery pack can be a liquid-cooled battery pack. The battery pack can include a leakage valve. The leakage valve can include an interlocking structure, which can include a micro-control component and a leakage valve cover with a long rod. For example, the micro-control component can be electrically connected to the battery management system.

[0043] In some embodiments, when the liquid leakage valve is in a closed state, the micro-control component can be in contact with the top of the long rod of the liquid leakage valve cover. Figure 2AAs shown, when the liquid leakage valve 6 is closed, the top of the long rod of the liquid leakage valve cover 7 contacts the micro-control component 8 on the top of the sealed cabin 2.

[0044] Figure 1 The method shown may include step S110 and step S120.

[0045] In step S110 , when the micro-control component detects that the long rod of the leakage valve cover is separated from the micro-control component, the micro-control component sends a first interlock signal to the battery management system. The first interlock signal indicates that the leakage valve is in an open state.

[0046] Step S120: When the micro-control component detects that the long rod of the leakage valve cover contacts the micro-control component, the micro-control component sends a second interlock signal to the battery management system. The second interlock signal indicates that the leakage valve is in a closed state.

[0047] It should be noted that the present application does not limit the order in which step S110 and step S120 are executed, and which step to execute can be determined based on the open or closed state of the leakage valve 6 .

[0048] In some embodiments, when the micro-control component detects that the long rod of the leakage valve cover is separated from the micro-control component, the interlocking structure of the leakage valve can be considered to be opened. When the micro-control component detects that the long rod of the leakage valve cover is in contact with the micro-control component, the interlocking structure of the leakage valve can be considered to be closed.

[0049] In some embodiments, the micro-control component can be an electronic device with a microcontroller. The micro-control component can detect whether the long rod of the leakage valve cover contacts or separates with it through physical contact, and can send a signal to the battery management system when it contacts or separates with the long rod of the leakage valve cover. Alternatively, the micro-control component can be a switch control. For example, the micro-control component can be composed of a trigger rod and internal contacts. When the micro-control component contacts the long rod of the leakage valve cover, the trigger rod is pressed by the long rod of the leakage valve cover, and the contacts inside the micro-control component will be closed accordingly. When the long rod of the leakage valve cover separates from the micro-control component, the trigger rod is lifted, and the contacts inside the micro-control component will be disconnected accordingly. The micro-control component can output different signals based on the closing or disconnection of the internal contacts.

[0050] by Figure 2A As an example, the embodiments of the present application are described in detail.

[0051] Figure 2A This is a structural diagram of a liquid leakage valve provided in an embodiment of the present application. Figure 2A The leakage valve shown can be arranged at the bottom of the battery pack.

[0052] like Figure 2AAs shown, the leakage valve 6 includes 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-control component 8. The micro-control component 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-control component 8 when the leakage valve 6 is closed. The rod of the leakage valve cover 7 is equipped with several springs 1 in the sealed chamber 2. The leakage valve 6 can be installed at the bottom of the battery pack.

[0053] 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 leakage valve cover 7 can be opened by the volume expansion of the absorbent paper 3, so that the excess liquid can flow out of the battery pack through the opened leakage valve cover 7. When the leakage valve cover 7 is opened, the long rod of the leakage valve cover 7 moves downward and separates from the micro-control component 8. The micro-control component 8 can detect the separation of the long rod of the leakage valve cover 7 and send a first interlock signal to the battery management system. This first interlock signal indicates that the leakage valve 6 is in the open state.

[0054] After excess liquid flows out of the battery pack through the liquid leakage valve, the absorbent paper sheet 3 shrinks in volume due to natural air drying, and the long rod of the liquid leakage valve cover 7 can move upward under the action of the spring 1, thereby closing the liquid leakage valve cover 7. At this time, when the liquid leakage valve cover 7 is closed, the long rod of the liquid leakage valve cover 7 moves upward and contacts the micro-control component 8. The micro-control component 8 can detect the contact between the long rod of the liquid leakage valve cover 7 and the micro-control component 8, and then the micro-control component 8 can send a second interlock signal to the battery management system, which indicates that the liquid leakage valve 6 is in the closed state.

[0055] In some embodiments, the sealed chamber 2 is provided to prevent excessive leakage of liquid from the battery pack from affecting the micro-control components, thereby affecting their normal operation. In some embodiments, a sealing ring may also be provided at the point where the sealed chamber 2 contacts the absorbent paper 3 to prevent liquid from entering the sealed chamber 2 through the absorbent paper 3, thereby affecting the normal operation of the micro-control components.

[0056] In some embodiments, the micro-control component 8 can be set at different positions of the leakage valve 6. Optionally, the micro-control component 8 can be set at the contact position between the leakage valve cover 7 and the bottom of the leakage valve 6 body, such as Figure 2B Optionally, the micro-control component 8 can be arranged on the upper part of the leakage valve 6, for example, the micro-control component 8 can be arranged on the outer top of the sealed cabin 2, as shown. Figure 2C Optionally, the micro-control component 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 is in contact with the micro-control component 8. Figure 2D shown.

[0057] For example, the micro-control component may include a contact control, which may optionally be an elastic control. It is understood that the contact control closes under external force and springs back when the external force is removed. When the micro-control component detects a change in the state of the contact control, it may send a signal to the battery management system. Figure 3 It is a structural diagram of the micro-control component in the embodiment of the present application.

[0058] The following combination Figure 2A 、 Figure 3 and Figure 4 , describes the embodiments of this application.

[0059] Figure 4 This is a flow chart of a battery pack safety detection method provided in an embodiment of the present application. Figure 4 The micro-control component includes a contact control, and optionally, the contact control can be an elastic control.

[0060] In some embodiments, when the leakage valve is closed, the contact control of the micro-control component can contact the top of the long rod of the leakage valve cover, such as Figure 2A As shown, the top of the long rod of the leakage valve cover 7 is in contact with the micro-control component 8 on the top of the sealing cabin 2.

[0061] In some embodiments, when the leakage valve cover is closed, the micro-control component contacts the long rod of the leakage valve cover, and the contact control of the micro-control component is in a closed state due to the external force of the long rod. When the leakage valve cover is opened, the micro-control component separates from the long rod of the leakage valve cover, and the contact control of the micro-control component can be in a pop-up state without the external force.

[0062] Figure 4 The method shown may include step S410 and step S420.

[0063] Step S410: When the micro-control component detects that the contact control pops up, the micro-control component sends a first interlock signal to the battery management system. The first interlock signal indicates that the leakage valve is in an open state.

[0064] Step S420: When the micro-control component detects that the contact control is closed, the micro-control component sends a second interlock signal to the battery management system. The second interlock signal indicates that the leakage valve is in a closed state.

[0065] It should be noted that this application does not limit the order in which step S410 and step S420 are executed.

[0066] In an embodiment of the present application, by setting a contact control on the micro-control component, the micro-control component can detect the state of the contact control being popped up or closed, thereby judging the open or closed state of the leakage valve and sending a signal to the battery management system. This design significantly improves the accuracy of signal detection and enhances the reliability of the overall system.

[0067] The embodiment of the present application solves the problem that traditional leakage valves cannot actively identify their own opening and closing states by providing an interlocking structure (including a micro-control component and a leakage valve cover with a long rod) in the leakage valve, and uses the relative position relationship between the micro-control component and the long rod to determine the opening and closing state of the leakage valve. At the same time, the state is reported to the battery management system in real time, and the status information of the leakage valve can be monitored in real time, thereby improving the safety and reliability of the system and reducing maintenance costs.

[0068] In some embodiments, the micro-control component may contact a side surface of the long rod of the leakage valve cover. The micro-control component may determine whether to send a signal by detecting whether the long rod of the leakage valve moves relative to the micro-control component. Optionally, when the micro-control component detects that the long rod of the leakage valve cover has moved downward relative to the micro-control component, it may be considered that the leakage valve is open, and the micro-control component may send a leakage valve opening signal to the battery management system. The leakage valve opening signal may be a first interlock signal.

[0069] by Figure 2E For example, the micro-control component 8 can be disposed on the inner wall of the liquid leakage valve 6 and in contact with the side surface of the long rod of the liquid leakage valve cover 7. When the battery pack leaks, liquid can flow into the liquid leakage valve 6 through the hole 4. The absorbent paper 3 can absorb the liquid, causing its own volume to expand. The liquid leakage valve cover 7 can be opened by the volume expansion of the absorbent paper 3. At this time, the long rod of the liquid leakage valve cover 7 moves downward relative to the micro-control component 8. When the micro-control component 8 detects the long rod moving downward, it deems that the liquid leakage valve is open and sends a first interlock signal to the battery management system. The first interlock signal indicates that the liquid leakage valve 6 is in the open state.

[0070] In some embodiments, after excess liquid flows out of the battery pack through the leakage valve, the absorbent paper sheet 3 shrinks in volume due to natural air drying, and the long rod of the leakage valve cover 7 can move upward under the action of the spring 1, closing the leakage valve cover 7. At this time, the long rod of the leakage valve cover 7 moves upward relative to the micro-control component 8. Optionally, when the leakage valve 6 is closed, a sensing point is provided on the surface area where the long rod of the leakage valve cover 7 contacts the micro-control component. When the micro-control component 8 detects the upward movement of the long rod of the leakage valve cover 7 and detects the sensing point, it is deemed that the leakage valve is now closed and a second interlock signal is sent to the battery management system. The second interlock signal indicates that the leakage valve 6 is in the closed state.

[0071] The micro-control component is in direct contact with the side surface of the long rod that contacts the leakage valve cover, and can accurately detect the relative movement of the long rod, thereby achieving high-precision judgment of the opening state of the leakage valve and improving the response speed, thereby enhancing the reliability of the system operation.

[0072] In some embodiments, when a battery pack leaks, the leakage valve is open to drain the liquid. However, when the leakage valve is open, the battery pack is connected to the outside world. If the battery pack continues to operate at high voltage, it will pose a serious safety hazard.

[0073] In some embodiments, after receiving the first interlock signal, the battery management system can send a warning signal to the vehicle control system of the vehicle. By sending the warning signal to the vehicle control system, the vehicle control system can be alerted when the leakage valve is opened, allowing the vehicle control system to take measures in advance to avoid safety issues caused by the opening of the leakage valve.

[0074] For example, when the vehicle control system receives a warning signal, it can display a warning on the control interface to the vehicle user, reminding the user that the leakage valve is currently open, posing a safety hazard. For example, when the vehicle is in motion, upon receiving the warning signal, the vehicle control system can display a warning on the control screen to alert the user to the safety hazard so that the user can take appropriate measures in a timely manner.

[0075] In a battery pack, the function of the leak valve is to discharge liquid generated by a malfunction of the leakage system to prevent liquid accumulation and safety issues. However, an open leak valve does not necessarily lead to serious safety issues. For example, bumps during vehicle driving may cause the leak valve to open briefly, or in some extreme environments, such as high temperature and high humidity, condensation generated in the battery pack can flow into the leak valve and open it. The amount of condensation is generally small, so the leak valve can be quickly closed in a short time after the condensation is discharged. To improve the accuracy of the early warning, the battery management system can determine whether an early warning is needed by combining other conditions.

[0076] In some embodiments, the battery management system may include an electronic timing module. For example, when the battery management system receives a first interlock signal, which may be that the leakage valve is in an open state, the battery management system may activate the electronic timing module to start timing and generate a first timing time.

[0077] For example, when the first timing time exceeds the safety time threshold, the battery management system may send a warning signal to the vehicle control system.

[0078] 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.

[0079] In some embodiments, when the first timing time exceeds the safety time threshold, it can also be understood that the time threshold for the leakage valve to work safely in the open state has been exceeded. At this time, it is considered that there is a safety hazard in the battery pack. The battery management system can send an early warning signal to the vehicle control system so that the vehicle control system can take relevant measures to avoid safety problems caused by the leakage valve being open for a long time.

[0080] In some embodiments, the first timing time begins after the battery management system receives a first interlock signal, and stops and resets the time after the battery management system receives a second interlock signal. The first interlock signal indicates that the leakage valve is in an open state, and the second interlock signal indicates that the leakage valve is in a closed state. In some embodiments, when the battery management system receives the first interlock signal, the electronic timing module begins timing. When the battery management system receives the second interlock signal, the electronic timing module stops timing, resets the generated first timing time, and restarts timing the next time the first interlock signal is received.

[0081] In some embodiments, when the first timer exceeds the safety time threshold, the vehicle control system receives a warning signal. After receiving the warning signal, the vehicle control system may send a stop timer signal to the battery management system. Upon receiving the stop timer signal, the battery management system may stop timing, reset the first timer, and restart timing upon the next receipt of the first interlock signal.

[0082] The battery management system in the embodiment of the present application can determine whether to send a warning signal to the vehicle control system after receiving the first interlock signal, combined with whether the first timing time exceeds the safety time threshold, thereby improving the accuracy of the warning.

[0083] In some embodiments, the battery pack may include an insulation resistance value, and when the battery management system receives the first interlock signal, the battery management system may measure the insulation resistance value through the monitoring module.

[0084] In some embodiments, the insulation resistance value may be the value of the insulation resistor set in the battery pack. Optionally, the insulation resistance value may be a resistor in the traditional sense, for example, the insulation resistance value may be 1000 ohms (Ω). Optionally, the insulation resistance value may be a specific indicator for evaluating the insulation performance of the battery pack at different voltages, for example, the insulation resistance value may be 1000 ohms per volt (Ω / V). It will be understood that at this time the insulation resistance value is proportional to the voltage, that is, the higher the voltage, the higher the required insulation resistance value to ensure the safety of the device. For example, in actual applications, the insulation resistance value is generally required to be no less than 1000Ω / V, which means that the insulation resistance value corresponding to each volt of voltage should be at least 1000Ω. Taking a 220V device as an example, the insulation resistance value should be no less than 220,000Ω (220V×1000Ω / V=220kΩ).

[0085] In some embodiments, the battery management system can determine whether there is a risk of leakage in the battery pack by detecting the insulation resistance value. For example, when a battery pack leaks, a conductive path may form inside or outside the battery pack, leading to leakage. When a battery pack leaks, the insulation resistance value will drop significantly.

[0086] In some embodiments, when the battery management system receives the first interlock signal confirming that the leakage valve is in the open state, the battery management system can monitor the insulation resistance value in the battery pack in real time through the monitoring module. When the insulation resistance value does not change significantly, it can be judged that the liquid in the battery pack has been completely discharged when the leakage valve is open, so there is no risk of leakage. On the contrary, if the insulation resistance value drops significantly, it can be judged that there is too much leakage in the battery pack at this time, and even if the leakage valve is in the open state, the liquid cannot be discharged in time. At this time, there is an obvious risk of leakage in the battery pack, and the battery management system needs to immediately send a warning signal to the vehicle control system so that the vehicle control system can take corresponding measures.

[0087] In some embodiments, the battery management system may determine whether to send a warning signal to the vehicle control system based on the first warning condition.

[0088] Exemplarily, the first warning condition may include that the insulation resistance value is within a resistance warning range. Optionally, the resistance warning range 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 insulation resistance values ​​in different battery packs are also different. The resistance warning range of the insulation resistance value needs to be adjusted according to the battery pack voltage to ensure that the battery packs of different vehicles can effectively prevent leakage risks.

[0089] In an embodiment of the present application, when the first interlock signal is received to confirm that the leakage valve is in an open state, the battery management system can monitor the insulation resistance value in the battery pack in real time through the monitoring module, and send a warning signal to the vehicle control system based on whether the insulation resistance value is within the resistance warning range. Such a design can promptly detect the leakage risk caused by failure of the leakage valve due to excessive leakage, effectively prevent potential safety hazards, ensure the safe operation of the battery pack, and improve the accuracy of the warning.

[0090] In some embodiments, the resistance warning range may include multiple subranges, each of which may correspond to different warning levels. The battery management system may determine whether to issue a warning signal to the vehicle control system based on a first warning condition. For example, the first warning condition may include the insulation resistance value being within the resistance warning range.

[0091] In some embodiments, when a battery pack leaks, the variation range of the insulation resistance value can reflect the degree of leakage risk. Therefore, the resistance warning range can be divided into multiple sub-intervals, and each sub-interval can correspond to a different degree of leakage risk. For example, when the insulation resistance value is greater than 1000Ω / V, it can be considered that the battery pack does not have a leakage risk. When the insulation resistance value is between 200Ω / V and 1000Ω / V, it can be considered that the battery pack has a slight leakage risk. When the insulation resistance value is lower than 200Ω / V, it can be considered that the battery pack has a serious leakage risk.

[0092] In some embodiments, multiple sub-intervals may correspond to different warning levels. For example, when the insulation resistance value is greater than 1000Ω / V, it can be considered that the insulation resistance value is normal at this time, and the warning level can be set to level one. When the insulation resistance value is between 200Ω / V and 1000Ω / V, it can be considered that the battery pack has a slight leakage risk, and the warning level can be set to level two. When the insulation resistance value is lower than 200Ω / V, it can be considered that the battery pack has a serious leakage risk, and the warning level can be set to level three.

[0093] In some embodiments, when the battery management system determines that the insulation resistance value is within the sub-interval, it sends a warning signal to the vehicle control system, where the warning signal includes a warning level corresponding to the sub-interval.

[0094] In some embodiments, when the battery management system determines that the insulation resistance value meets the sub-interval range, it can send a warning signal to the vehicle control system, and the warning signal may include a warning level corresponding to the sub-interval. For example, when the battery management system receives the first interlock signal to determine that the leakage valve is in the open state, and the insulation resistance value measured by the monitoring module is between 200Ω / V and 1000Ω / V, it meets the first warning condition. Therefore, the battery management system can send a warning signal to the vehicle control system. Since the monitored insulation resistance value is between 200Ω / V and 1000Ω / V, the warning level can be set to level two. After receiving the warning signal, the vehicle control system can obtain that the risk warning level is level two.

[0095] In some embodiments, when the battery management system sends a warning signal, it can also determine a control strategy for the vehicle based on the warning level and control the vehicle according to the control strategy.

[0096] For example, when the battery management system receives the first interlock signal and determines that the leakage valve is open, it can determine whether the monitored insulation value meets the first warning condition. If the first warning condition is met, it can send a warning signal to the vehicle control system. At the same time, the battery management system can also determine the corresponding vehicle control strategy based on the warning level and control the vehicle according to this control strategy to prevent the occurrence of risk accidents, thereby improving the safety of the battery pack.

[0097] For example, when the battery management system receives the first interlock signal and determines that the leakage valve is in the open state, the insulation resistance value measured by the monitoring module is between 200Ω / V and 1000Ω / V. At this time, the warning level can be set to level two, and the battery management system can send a warning signal to the vehicle control system. At the same time, the battery management system can also determine the corresponding vehicle control strategy based on the warning level being level two, and control the vehicle according to the control strategy. For example, the control strategy can be to limit the output power of the battery pack to avoid the occurrence of risk accidents.

[0098] In some embodiments, the control strategy may include one or more of the following operations: controlling the battery management system to not enter a sleep state; limiting the output power of the battery pack; and cutting off the connection between the battery pack and the vehicle's high-voltage circuit.

[0099] For example, when the warning level is level 2, the battery management system can control itself from entering a dormant state while sending a warning signal, and can continuously monitor the insulation resistance value in the battery pack and the status of the leakage valve at the same time. Alternatively, when the warning level is level 2, the battery management system can control itself from entering a dormant state while limiting the output power of the battery pack and continuously monitoring the insulation resistance value. For example, when the warning level is level 3, it means that the risk of the battery pack is high. If there is a great risk of leakage, the battery management system can directly cut off the connection between the battery pack and the vehicle's high-voltage circuit to prevent the battery pack from leaking, which would cause more serious safety problems.

[0100] The following combination Figure 5 , the embodiments of the present application are described.

[0101] Figure 5 A battery pack safety detection method proposed in an embodiment of the present application is provided. Figure 5 It includes steps S510 to S550.

[0102] Step S510: determine whether the battery management system enters a dormant state.

[0103] Optionally, the battery management system enters a dormant state and does not perform detection.

[0104] Optionally, when the battery management system operates normally, the process may jump to step S520 to continue testing.

[0105] In step S520 , the interlocking structure of the leakage valve is opened, and the battery management system receives a first interlocking signal.

[0106] In some embodiments, the long rod of the valve cover of the leakage valve is separated from the micro-control component, and the leakage valve is in an open state. Upon detecting that the long rod of the valve cover of the leakage valve is separated from the micro-control component, the micro-control component may send a first interlock signal to the battery management system.

[0107] In some embodiments, when the battery management system receives the first interlock signal and determines that the leakage valve is in an open state, the electronic timing module can be started to calculate the first timing time.

[0108] In some embodiments, when the battery management system receives the first interlock signal and determines that the leakage valve is in an open state, the monitoring module can monitor whether the insulation resistance value in the battery pack is greater than 1000Ω / V.

[0109] Optionally, when the insulation resistance value is greater than 1000Ω / V, the process may skip to step S530.

[0110] Optionally, when the insulation resistance value is less than 1000Ω / V and greater than 200Ω / V, the process may skip to step S540.

[0111] Optionally, when the insulation resistance value is less than 200Ω / V, the process may skip to step S550.

[0112] In step S530, when the insulation resistance value is greater than 1000Ω / V, it can be considered that the battery pack can work normally at this time, so the battery management system does not issue a warning signal, but still continuously monitors the opening and closing status of the leakage valve.

[0113] Since the insulation resistance value is greater than 1000Ω / V, it can be considered normal. Therefore, the leakage valve opening is likely due to condensation generated during high-voltage operation of the battery pack. When the insulation resistance value is greater than 1000Ω / V, the warning level is considered level 1. The control strategy corresponding to level 1 prevents the battery management system from entering sleep mode and continuously monitors the opening and closing status of the leakage valve and the insulation resistance value.

[0114] In some embodiments, the safety time threshold can be 24 hours. When the first timer is within 24 hours and the battery management system receives the second interlock signal to determine that the leakage valve is closed, the electronic timing module can pause the first timer and reset it to zero, and the battery management system's monitoring can be turned off. If the first timer is greater than 24 hours and the battery management system has not received the second interlock signal, the battery management system can send a warning signal to the vehicle control system.

[0115] In step S540 , when the insulation resistance value is less than 1000Ω / V and greater than 200Ω / V, the warning level can be determined as level 2, and the battery management system can send a warning signal to the vehicle control system.

[0116] At the same time, the battery management system can limit the output power of the battery pack according to the second-level warning level. At the same time, the battery management system does not enter the sleep state and continuously monitors the status of the leakage valve and the value of the insulation resistance.

[0117] In some embodiments, the safety time threshold may be 12 hours. When the first timer time is within 12 hours and the battery management system detects that the insulation resistance value has recovered to above 1000Ω / V, the process jumps to step S530. When the first timer time is within 12 hours and the battery management system detects that the insulation resistance value is still between 200Ω / V and 1000Ω / V, the battery management system may determine that there is leakage in the battery pack and that maintenance is required. Therefore, the warning level may be raised to level three and a warning signal may be sent to the vehicle control system again.

[0118] Step S550: When the insulation resistance value is less than 200Ω / V, the warning level can be determined as level three, and the battery management system can send a warning signal to the vehicle control system.

[0119] At the same time, the battery management system can disconnect the battery pack from the high-voltage circuit inside the vehicle according to the three-level warning level, and determine that there is a large amount of leakage in the battery pack and maintenance is required.

[0120] As can be seen from the above, in the present application, an interlocking structure (including a micro-control component and a leakage valve cover with a long rod) can be set in the leakage valve, and the relative position relationship between the micro-control component and the long rod can be used to determine the opening and closing state of the leakage valve, thereby solving the problem that the traditional leakage valve cannot actively identify its own opening and closing state. At the same time, the state is reported to the battery management system in real time, and the state information of the leakage valve can be monitored in real time, thereby improving the safety and reliability of the system and reducing maintenance costs. At the same time, the battery management system can also send an early warning signal to the vehicle control system after receiving the first interlocking signal, so that the vehicle control system can take corresponding measures in advance, thereby avoiding safety problems caused by the opening of the leakage valve. The battery management system can also determine whether to send a warning signal based on the time when the leakage valve is opened, or the battery management system can also measure the insulation resistance value in the battery pack to determine whether to send a warning signal, thereby improving the accuracy of the early warning.

[0121] The above describes the method embodiment of the present application in detail. Based on the above content, the present application also proposes a vehicle safety detection system. Figure 6 The system embodiment of the present application is described in detail. It should be understood that the description of the above method embodiment corresponds to the description of the system embodiment, so for parts not described in detail, reference can be made to the above method embodiment.

[0122] Figure 6 A vehicle safety detection system 600 provided in an embodiment of the present application may include:

[0123] The battery pack 610 may be a liquid-cooled battery pack. The battery pack 610 may include a leakage valve. The leakage valve may include an interlocking structure. The interlocking structure includes a micro-control component and a leakage valve cover with a long rod.

[0124] The battery management system 620 may be electrically connected to the battery pack 610 .

[0125] Among them, the micro-control component is used to detect that the long rod of the leakage valve cover is separated from the micro-control component, and send a first interlock signal to the battery management system 620. The micro-control component is also used to detect that the long rod of the leakage valve cover is in contact with the micro-control component, and send a second interlock signal to the battery management system 620. The first interlock signal indicates that the leakage valve is in an open state, and the second interlock signal indicates that the leakage valve is in a closed state.

[0126] Optionally, the micro-control component may include a contact control, which may be an elastic control. The micro-control component may be configured to detect when the contact control is released and send a first interlock signal to the battery management system 620. The micro-control component may also be configured to detect when the contact control is closed and send a second interlock signal to the battery management system 620.

[0127] Optionally, the battery pack 610 can be placed in a vehicle, and the vehicle safety detection system 600 can also include a vehicle control system 630. The battery management system 620 is further configured to send a warning signal to the vehicle control system 630 upon receiving the first interlock signal.

[0128] Optionally, the battery management system 620 may include an electronic timing module. The battery management system 620 is also used to start the electronic timing module for timing after receiving the first interlock signal to generate a first timing time. When the first timing time exceeds the safety time threshold, the battery management system 620 can be used to send a warning signal to the vehicle control system 630.

[0129] Optionally, the battery pack 610 may include an insulation resistance value, and the battery management system 620 is configured to measure the insulation resistance value via the monitoring module upon receiving the first interlock signal. The battery management system 620 is further configured to determine whether to issue a warning signal to the vehicle control system 630 based on a first warning condition, wherein the first warning condition includes the insulation resistance value being within a resistance warning range, which may be related to the voltage of the battery pack 610.

[0130] Optionally, the resistance warning range may include multiple subranges, each of which may correspond to different warning levels. Battery management system 620 may be configured to issue a warning signal to vehicle control system 630 when the insulation resistance value is determined to be within a subrange. The warning signal may include the warning level corresponding to the subrange. Battery management system 620 may also be configured to determine a vehicle control strategy based on the warning level when issuing the warning signal and control the vehicle according to the control strategy.

[0131] Optionally, the control strategy may include one or more of the following operations: controlling the battery management system 620 not to enter a dormant state; limiting the output power of the battery pack 610; and cutting off the connection between the battery pack 610 and the vehicle high-voltage circuit.

[0132] Optionally, the micro-control component contacts the side surface of the long rod of the leakage valve cover, and the micro-control component is used to send a first interlock signal to the battery management system 620 when the long rod of the leakage valve cover moves downward relative to the micro-control component.

[0133] 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.

[0134] 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 battery pack safety detection method provided in the above embodiment are implemented. The specific steps will not be repeated here.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] 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 battery pack safety detection method, characterized in that: The battery pack is electrically connected to a battery management system, the battery pack is a liquid-cooled battery pack, the battery pack includes a leakage valve, the leakage valve includes an interlocking structure, the interlocking structure includes a micro-control component and a leakage valve cover with a long rod, and the method includes: When the micro-control component detects that the long rod of the leakage valve cover is separated from the micro-control component, the micro-control component sends a first interlock signal to the battery management system, where the first interlock signal indicates that the leakage valve is in an open state; When the micro-control component detects that the long rod of the leakage valve cover is in contact with the micro-control component, the micro-control component sends a second interlock signal to the battery management system, where the second interlock signal indicates that the leakage valve is in a closed state.

2. The method according to claim 1, characterized in that The micro-control component includes a contact control, and the contact control is an elastic control. When the micro-control component detects that the long rod of the leakage valve cover is separated from the micro-control component, the micro-control component sends a first interlock signal to the battery management system, including: When the micro-control component detects that the contact control pops up, the micro-control component sends a first interlock signal to the battery management system; When the micro-control component detects that the long rod of the leakage valve cover contacts the micro-control component, the micro-control component sends a second interlock signal to the battery management system, including: When the micro-control component detects that the contact control is closed, the micro-control component sends a second interlock signal to the battery management system.

3. The method according to claim 1, wherein the battery pack is placed in a vehicle, and the vehicle includes a vehicle control system, characterized in that: The method further comprises: When the battery management system receives the first interlock signal, the battery management system sends a warning signal to the vehicle control system.

4. The method according to claim 3, characterized in that The battery management system includes an electronic timing module. When the battery management system receives the first interlock signal, the battery management system sends a warning signal to the vehicle control system, including: When the battery management system receives the first interlock signal, it starts the electronic timing module to start timing and generate a first timing time; When the first timing time exceeds the safety time threshold, the battery management system sends the early warning signal to the vehicle control system.

5. The method according to claim 3, characterized in that The battery pack includes an insulation resistance value, and when the battery management system receives the first interlock signal, the battery management system sends a warning signal to the vehicle control system, including: When the battery management system receives the first interlock signal, the battery management system measures the insulation resistance value through the monitoring module; The battery management system determines whether to send a warning signal to the vehicle control system according to the first warning condition, The first warning condition includes that the insulation resistance value is within a resistance warning range, and the resistance warning range is related to the voltage of the battery pack.

6. The method according to claim 5, characterized in that The resistance warning range includes multiple sub-intervals, each of which corresponds to different warning levels. The battery management system determines whether to issue a warning signal to the vehicle control system based on a first warning condition, including: When the battery management system determines that the insulation resistance value is within the sub-interval, the battery management system sends the warning signal to the vehicle control system, where the warning signal includes the warning level corresponding to the sub-interval; When the warning signal is sent, determining a control strategy for the vehicle according to the warning level; The vehicle is controlled according to the control strategy.

7. The method according to claim 6, characterized in that The control strategy includes one or more of the following operations: Controlling the battery management system to not enter a dormant state; limiting the output power of the battery pack; The connection between the battery pack and the vehicle high-voltage circuit is cut off.

8. The method according to claim 1, characterized in that The micro-control component is in contact with the side surface of the long rod of the leakage valve cover, and the method further includes: When the long rod of the leakage valve cover moves downward relative to the micro-control component, the micro-control component sends the first interlocking signal to the battery management system.

9. 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 an interlocking structure, and the interlocking structure includes a micro-control component and a leakage valve cover with a long rod; A battery management system, the battery management system is electrically connected to the battery pack, Among them, the micro-control component is used to send a first interlock signal to the battery management system when it detects that the long rod of the leakage valve cover is separated from the micro-control component. The micro-control component is also used to send a second interlock signal to the battery management system when it detects that the long rod of the leakage valve cover is in contact with the micro-control component. The first interlock signal indicates that the leakage valve is in an open state, and the second interlock signal indicates that the leakage valve is in a closed state.

10. A vehicle, characterized in that: The vehicle includes the vehicle safety detection system according to claim 9.

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