Warning system and warning method for liquid leakage valve and vehicle

Abstract

The invention provides an alarm system and method for a liquid leakage valve, a battery pack and a vehicle, the alarm system comprises a control unit used for controlling connection or disconnection of an interlocking loop according to the working state of the liquid leakage valve in the battery pack, if the working state of the liquid leakage valve is an open state, the interlocking loop is controlled to be disconnected, and if the working state of the liquid leakage valve is an open state, the interlocking loop is controlled to be disconnected; if the working state of the liquid leakage valve is a closed state, the interlocking loop is controlled to be conducted; the detection unit is used for detecting whether an interlocking signal exists in the interlocking loop or not and sending a detection result to the alarm unit; and the alarm unit is used for determining the working state of the liquid leakage valve according to the detection result and giving an alarm based on the working state of the liquid leakage valve. The alarm system is arranged for the liquid leakage valve to give an alarm for the liquid discharging action of the liquid leakage valve, so that the vehicle can perform subsequent treatment in time according to the alarm, and the safety of the battery pack during use is improved.

Description

Technical Field

[0001] The present application relates to the field of control technology, and in particular to an alarm system and an alarm method for a leakage valve, a battery pack, and a vehicle. Background Art

[0002] The battery pack of an electric vehicle is one of the vehicle's core components, primarily responsible for storing and providing the electrical energy required to propel the vehicle. To improve battery performance and safety, a cooling system is typically installed within the pack to maintain the battery's normal operating temperature. Because cooling systems pose the risk of coolant leaks, some battery packs are equipped with a drain valve to drain any leaking coolant.

[0003] 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

[0004] This application provides a leakage valve alarm system, an alarm method, a battery pack, and a vehicle to improve the safety of the battery pack during use. The following describes the system from the following aspects.

[0005] In a first aspect, an alarm system for a leakage valve is provided, which includes: a control unit, used to control the conduction or disconnection of an interlocking circuit according to the working state of the leakage valve in the battery pack, wherein if the working state of the leakage valve is an open state, the interlocking circuit is controlled to be disconnected, and if the working state of the leakage valve is a closed state, the interlocking circuit is controlled to be conducted; a detection unit, used to detect whether there is an interlocking signal in the interlocking circuit, and send the detection result to the alarm unit; the alarm unit, used to determine the working state of the leakage valve according to the detection result, and to issue an alarm based on the working state of the leakage valve.

[0006] In some possible implementations, the interlock circuit further includes a high-voltage connection device connected in series with the liquid leakage valve.

[0007] In some possible implementations, the interlock circuit further includes a high-voltage connection device connected in parallel with the leakage valve.

[0008] In some possible implementations, the liquid leakage valve is one of a plurality of liquid leakage valves, and the plurality of liquid leakage valves are connected in series in an interlocking loop.

[0009] In some possible implementations, the leakage valve is one of a plurality of leakage valves, and the plurality of leakage valves are connected in parallel in an interlocking loop.

[0010] In some possible implementations, the control unit includes a micro-switch, which is used to: when the valve cover of the leakage valve is opened, the micro-switch is separated from the first contact point provided on the leakage valve to disconnect the interlock circuit; when the valve cover is closed, the micro-switch contacts the first contact point to conduct the interlock circuit.

[0011] In a second aspect, an alarm method for a leakage valve is provided, which is applied to an alarm system, and the alarm system includes: a control unit, a detection unit and an alarm unit; the method includes: the control unit controls the conduction or disconnection of the interlocking circuit according to the working state of the leakage valve, wherein if the working state of the leakage valve is the open state, the interlocking circuit is controlled to be disconnected, and if the working state of the leakage valve is the closed state, the interlocking circuit is controlled to be connected; the detection unit detects whether there is an interlocking signal in the interlocking circuit, and sends the detection result to the alarm unit; the alarm unit determines the working state of the leakage valve according to the detection result, and issues an alarm based on the working state of the leakage valve.

[0012] In some possible implementations, the alarm unit determines the working status of the leakage valve based on the detection result, including: if the detection result indicates that there is no interlocking signal in the interlocking circuit, the alarm unit determines that the leakage valve is in the open state; and / or, if the detection result indicates that there is an interlocking signal in the interlocking circuit, the alarm unit determines that the leakage valve is in the closed state.

[0013] In some possible implementations, the alarm unit issues an alarm based on the working state of the liquid leakage valve, including: if the alarm unit determines that the liquid leakage valve is in an open state, sending an alarm signal.

[0014] In a third aspect, a battery pack is provided, which includes the alarm system described in any one of the first aspects above.

[0015] In a fourth aspect, a vehicle is provided, comprising the alarm system described in any one of the first aspects above.

[0016] The relevant technology cannot detect the drainage action of the leakage valve in the battery pack, so it cannot send any prompt signal to the vehicle, resulting in the failure to obtain corresponding follow-up processing in time after the leakage valve is opened.

[0017] In an embodiment of the present application, an alarm system is provided for the leakage valve to warn of the drainage action of the leakage valve. In this way, the vehicle can perform subsequent processing in a timely manner according to the alarm signal, thereby helping to improve the safety of the battery pack during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic block diagram of the alarm system provided in an embodiment of the present application.

[0019] Figure 2A schematic block diagram of an interlocking loop provided in an embodiment of the present application.

[0020] Figure 3 A schematic diagram of a working state of the interlocking circuit provided in an embodiment of the present application.

[0021] Figure 4 A schematic diagram of another working state of the interlocking circuit provided in an embodiment of the present application.

[0022] Figure 5 A schematic diagram of a connection method of a liquid leakage valve in an interlocking circuit provided in an embodiment of the present application.

[0023] Figure 6 A schematic diagram of another connection method of the leakage valve in the interlocking circuit provided in an embodiment of the present application.

[0024] Figure 7 A schematic diagram of another connection method of the leakage valve in the interlocking circuit provided in an embodiment of the present application.

[0025] Figure 8 A schematic structural diagram of a liquid leakage valve provided in one embodiment of the present application.

[0026] Figure 9 This is a schematic diagram of the structure of the micro switch provided in an embodiment of the present application.

[0027] Figure 10 A schematic structural diagram of a liquid leakage valve provided in another embodiment of the present application.

[0028] Figure 11 This is a schematic structural diagram of a liquid leakage valve provided in yet another embodiment of the present application.

[0029] Figure 12 A flowchart of the alarm method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0031] The battery pack of an electric vehicle is one of the vehicle's core components, primarily responsible for storing and providing the electrical energy required to drive the vehicle. To facilitate understanding, the following first exemplifies the structure of a battery pack applicable to an embodiment of the present application.

[0032] In some embodiments, a battery pack may include a battery management system (BMS), battery modules, a thermal management system, an electrical system, and structural components. The following describes each of the above components in detail.

[0033] BMS: The BMS is the "brain" of the battery pack, primarily responsible for monitoring and managing the battery's status to ensure safe and efficient operation. Its functions include: Data acquisition: Real-time monitoring of battery voltage, current, temperature, and other parameters; Protection: Preventing abnormal conditions such as overcharging, over-discharging, overcurrent, and overtemperature to ensure battery safety; Balancing: Maintaining consistent voltage across individual cells within the battery pack through balanced charging or discharging, thereby extending battery life; Communication: Interacting with external systems (such as vehicle control systems and energy management systems) for remote monitoring and management; Fault diagnosis: Promptly detecting and reporting abnormal battery system conditions to ensure system reliability and safety.

[0034] Battery module: The battery module is the core component of the battery pack, composed of multiple battery cells connected in series or parallel. Its main components include: battery cells: the basic unit of the module, responsible for storing and releasing electrical energy; connectors: used for electrical connection between battery cells, ensuring smooth current transmission; electronic control unit: monitors the battery cell status, such as voltage and temperature, and manages charge and discharge; casing and bracket: protects the battery cell and electronic components, provides mechanical support, and prevents external influences; thermal management components: such as cooling pipes and cold plates, are used to maintain the battery cell operating within a suitable temperature range.

[0035] Thermal Management System: This system maintains the battery pack within a suitable operating temperature range, preventing overheating or overcooling, thereby extending battery life and improving performance. This system includes a cooling system to dissipate heat when the battery or components overheat. Common cooling systems include liquid cooling, which uses coolant to circulate through pipes or cold plates to dissipate heat, offering high efficiency.

[0036] The electrical system is the battery pack's "nervous system," responsible for current transmission and signal control. Its main components include: a high-voltage wiring harness, which transmits battery power to the load and functions as the battery pack's "aorta"; and a low-voltage wiring harness, which transmits detection and control signals for monitoring and managing battery status.

[0037] Structural components: These components are the "skeleton" of the battery pack, providing support, fixation, and protection. Their main components include: the housing, which houses the battery modules, BMS, and other components; and the cover, which protects the internal components of the battery pack from the outside world.

[0038] As mentioned above, to improve battery pack performance and safety, a cooling system is typically installed within the pack to maintain the battery's normal operating temperature. Due to the complex and ever-changing operating conditions of electric vehicles, higher performance and safety requirements are placed on the battery pack. In some battery pack designs, such as those using ternary materials in a prismatic shell, there is a risk of coolant leakage due to cooling system failure. Therefore, some packs are equipped with a leak valve to drain any leaked coolant.

[0039] 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, the relevant technology cannot send any prompt signal to the vehicle, and the leakage valve will not be able to receive the corresponding subsequent processing in time after it is opened. When the valve cover is opened to drain, it cannot be automatically closed in time. It needs to wait for the absorbent paper inside the leakage valve to dry naturally 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 state of connection with the external environment. If high-pressure work continues at this time, it will be a more serious safety hazard.

[0040] To address the above-mentioned problem, an embodiment of the present application provides an alarm system for the leakage valve to alarm the drainage action of the leakage valve. In this way, the vehicle can perform subsequent processing in a timely manner according to the alarm signal, thereby helping to improve the safety of the battery pack during use.

[0041] Combined with the following Figure 1 The following describes in detail a leakage valve alarm system provided in an embodiment of the present application. The alarm system can be applied to a leakage valve in a battery pack.

[0042] like Figure 1 As shown, the alarm system includes a control unit 110 , a detection unit 120 and an alarm unit 130 .

[0043] The control unit 110 is configured to control the interlock circuit to be open or closed based on the operating state of the leakage valve in the battery pack. If the leakage valve is open, the interlock circuit is opened; if the leakage valve is closed, the interlock circuit is opened. The control unit 110 may open or close the interlock circuit based on a control switch.

[0044] The detection unit 120 is used to detect whether there is an interlock signal in the interlock loop and send the detection result to the alarm unit 130.

[0045] Alarm unit 130 is configured to determine the operating status of the leaking valve based on the test results and issue an alarm based on the operating status of the leaking valve. For example, if the test results indicate that the interlock signal is not present in the interlock circuit, alarm unit 130 determines that the leaking valve is open; if the test results indicate that the interlock signal is present in the interlock circuit, alarm unit 130 determines that the leaking valve is closed.

[0046] Furthermore, if the leakage valve is open, the alarm unit 130 can issue a warning to the vehicle; alternatively, if the leakage valve is closed, the alarm unit 130 does not need to issue a warning to the vehicle. This allows the vehicle to promptly perform subsequent actions when the detection unit 120 detects that the leakage valve is open, thereby improving the safety of the battery pack during use.

[0047] In some embodiments, the function of the detection unit 120 may be performed based on the BMS, or the function of the alarm unit 130 may be performed based on the BMS, or both the functions of the alarm unit 130 and the detection unit 120 may be performed based on the BMS.

[0048] As mentioned above, when the leakage valve is in the open state, the high-voltage environment inside the battery pack is in a state of communication with the external environment, and there is a great safety hazard at this time. In order to solve the above problems, the embodiment of the present application associates the opening of the leakage valve with the interlocking circuit, that is, when the leakage valve is opened, the control interlocking circuit is disconnected. In some scenarios, the interlocking here can be understood as the interlocking of the leakage valve and the power control device of the high-voltage system (such as BMS or high-voltage contactor). For example, after the leakage valve is opened, the alarm instruction of the BMS (or high-voltage power-off instruction) can be triggered, or the high-voltage contactor can be triggered to cut off the high-voltage main circuit. This interlocking mechanism can ensure that once the leakage valve is detected to be open, the interlocking circuit will be disconnected immediately, and then the corresponding protection action mentioned above will be executed, which will help to further improve the safety of the battery pack when in use.

[0049] In some embodiments, as Figure 2 As shown, the interlock circuit 200 may include: a power supply unit 210 , a control switch 220 and a signal acquisition unit 230 .

[0050] The power supply unit 210 is used to provide an interlocking signal to the interlocking circuit 200 , or in other words, to provide a voltage to the interlocking circuit 200 .

[0051] The control switch 220 is used to disconnect the interlock circuit 200 in response to the opening of the leakage valve; or to connect the interlock circuit 200 in response to the closing of the leakage valve.

[0052] The signal acquisition unit 230 is used to acquire the interlock signal in the interlock circuit 200 and send it to the detection unit 120 .

[0053] For example, Figure 3 and Figure 4 Schematic diagram of the interlocking circuit of the embodiment of the present application is shown. Figure 3 As shown in the figure, when the leakage valve is closed, the interlock circuit is in the conducting state. At this time, the BMS can receive the interlock signal in the interlock circuit through the interlock signal test point, that is, the state of the interlock signal in the BMS is connected. Figure 4 As shown, when the leakage valve is opened, the interlock circuit is disconnected. At this time, the BMS cannot receive the interlock signal in the interlock circuit through the interlock signal test point, that is, the state of the interlock signal in the BMS is disconnected.

[0054] In embodiments of the present application, the same interlock circuit can be associated with only the leakage valve or with both the leakage valve and the high-voltage connector. In some embodiments, the leakage valve and the high-voltage connector can be connected in series within the interlock circuit. In other words, the leakage valve and the high-voltage connector can share a single interlock circuit. For example, the leakage valve can share a single high-voltage interlock circuit with a fast / slow charging plug-in. This detection method can reduce the cost of a single circuit during hardware design, resulting in a more cost-effective solution.

[0055] For example, Figure 5 As shown, the two leakage valves in the battery pack and the fast / slow charging plug-in share a high-voltage interlock circuit. In this interlock circuit, the interlock signal in the interlock circuit is sent to the BMS through the set interlock signal test point.

[0056] It should be understood that in addition to the fast / slow charging plug, the leakage valve can also share a high-voltage interlock circuit with various other high-voltage connecting devices. For example, these high-voltage connecting devices may include but are not limited to: high-voltage junction boxes, inverters, heaters, high-voltage cables and connectors.

[0057] Alternatively, in other embodiments, the leakage valve and the high-voltage connector can be connected in parallel in an interlocking circuit. In other words, the leakage valve and the high-voltage connector can each have their own interlocking circuit. For example, the leakage valve can have its own interlocking circuit with the fast / slow charging plug-in. Since the leakage valve and the high-voltage connector each have their own interlocking circuit, this detection method is more direct. Once an interlocking circuit is disconnected (such as issuing an alarm command), it can be directly determined whether the leakage valve is open or a high-voltage connector has failed, which helps to improve detection efficiency.

[0058] For example, Figure 6 As shown in the figure, the two leakage valves and the fast / slow charging plug-in in the battery pack each have their own interlock circuit. That is, the two leakage valves share one interlock circuit, and the fast / slow charging plug-in uses another interlock circuit. In these two interlock circuits, the interlock signal in each interlock circuit is sent to the BMS through the set interlock signal test point 1 and interlock signal test point 2.

[0059] If there are multiple leakage valves in the battery pack, in some embodiments, the multiple leakage valves can be connected in series in an interlocking circuit. In other words, multiple leakage valves can share one interlocking circuit. Furthermore, the high-voltage connection device described above can also be connected in series in this interlocking circuit (such as Figure 5 This detection method can reduce the cost of at least one loop during hardware design, resulting in a more cost-effective approach.

[0060] Alternatively, in other embodiments, the multiple leaking valves can be connected in parallel in an interlocking circuit. In other words, each leaking valve can have its own interlocking circuit. Since each leaking valve has its own interlocking circuit, this detection method is more direct. Once an interlocking circuit is disconnected (e.g., an alarm is issued), it is possible to directly determine which leaking valve is open, thereby improving detection efficiency.

[0061] For example, Figure 7 As shown, each of the n leakage valves in the battery pack has its own interlock circuit. In each of the n interlock circuits, interlock signals are sent to the BMS via interlock signal test points 1 to n. Here, n is an integer greater than 1.

[0062] Combined with the following Figure 8 , introducing the structural schematic diagram of the liquid leakage valve provided in the embodiment of the present application.

[0063] like Figure 8 As shown, the liquid leakage valve includes a valve body 810 , a valve cover 820 , an expansion member 830 , an elastic member 840 , and a control switch 850 .

[0064] The valve body 810 may also be referred to as a leakage valve body. In some embodiments, the valve body 810 of the leakage valve may include a hole 860. The position of the hole 860 may be as follows: Figure 8 When leakage occurs inside the battery pack, the liquid flows into the cavity of the valve body 810 through the hole 860 .

[0065] Valve cover 820, also known as a leakage valve cover, is used to open or close the leakage valve. For example, when valve cover 820 is open, the leakage valve is open to drain liquid that has flowed into the cavity of valve body 810 to the outside of the battery pack; when valve cover 820 is closed, the leakage valve is closed.

[0066] Expansion member 830 is located within the cavity of valve body 810. After absorbing liquid (such as leaked coolant) within valve body 810, it expands to open valve cover 820, allowing the liquid inside the battery pack to drain out. If expansion member 830 does not absorb liquid, or if it dries after absorbing liquid, it will not exert force on valve cover 820. Exemplarily, expansion member 830 can be a sheet of absorbent paper.

[0067] Elastic member 840 is used to close valve cover 820 under the action of elastic force, thereby closing the leaking valve. For example, after absorbing liquid, expansion member 830 expands, driving valve cover 820 open while further compressing elastic member 840. When the liquid in valve body 810 is completely drained and expansion member 830, which has absorbed the liquid, dries, the force acting on it disappears. At this point, elastic member 840 can close valve cover 820 under the action of elastic force, and this elastic force keeps valve cover 820 closed. For example, elastic member 840 can be a spring.

[0068] The control switch 850 is used to control the interlock circuit to be open or closed according to whether the valve cover 820 is open or closed. Specifically, if the leakage valve is in the open state, the interlock circuit is controlled to be closed; if the leakage valve is in the closed state, the interlock circuit is controlled to be closed.

[0069] Furthermore, the control switch 850 may be connected to the detection unit 120 , so that the detection unit 120 detects whether an interlock signal exists in the interlock loop and sends the detection result to the alarm unit 130 .

[0070] In addition to the above components, the liquid leakage valve may also include other components, such as a sealing cabin 870, a sealing ring 880, and a long rod portion 822 on the valve cover 820. The sealing cabin 870 is used to isolate the control switch 850 and the elastic member 840 from the liquid inside the valve body 810, so as to prevent the liquid from damaging the control switch 850 and the elastic member 840. The sealing ring 880 is arranged at the position (gap) where the valve body 810 and the valve cover 820 contact each other to prevent the liquid from leaking from the gap between the two. The long rod portion 822 on the valve cover 820 is arranged inside the cavity of the valve body 810. Figure 8 As shown, one end of the long rod portion 822 contacts the elastic member 840 via an abutment. When the abutment moves in the direction of opening the valve cover 820, it compresses the elastic member 840 to generate an elastic force. In addition, the long rod portion 822 also passes through the center of the expansion member 830 in the vertical direction. This helps to position the expansion member 830 and prevents the expansion member 830 from applying uneven force to the valve cover 820 due to tilting, which would result in inconsistent opening angles on both sides of the valve cover 820.

[0071] The embodiment of the present application does not limit the type of control switch 850, as long as it can control the on and off of the interlock circuit. In some embodiments, the control switch 850 can be a mechanical switch. Alternatively, the control switch 850 can also be a magnetic switch.

[0072] For example, the control switch 850 can be a micro-switch. The micro-switch is used to: when the valve cover of the leakage valve is opened, the micro-switch is separated from the first contact point provided on the leakage valve to disconnect the interlock circuit; when the valve cover of the leakage valve is closed, the micro-switch contacts the first contact point to connect the interlock circuit. That is to say, in the interlock circuit, the disconnection or connection of the interlock signal in the interlock circuit can be controlled based on the opening or closing of the micro-switch. The micro-switch realizes the on-off of the circuit based on the contact mechanism, that is, when subjected to sufficient force, the contact will quickly switch from one state to another (for example, from open to closed). This action characteristic enables the micro-switch to accurately respond to the opening of the leakage valve, thereby helping to improve the accuracy of the detection device.

[0073] For example, Figure 9 Figure 1 shows a schematic diagram of the structure of a micro switch. Figure 9 As shown, when the micro-switch 900 is not turned on, its switch 910 is in a pressed state (i.e., in contact with the first contact point), and the interlock signal in the interlock circuit is connected. When the micro-switch 300 is turned on, its switch 310 is in a popped-open state (i.e., separated from the first contact point), and the interlock signal in the interlock circuit is disconnected.

[0074] It should be understood that the present embodiment does not limit the location of the first contact point, as long as it can perform the switching action of the micro switch. For example, the first contact point can be located on the first long rod of the valve cover 820 (i.e., the long rod portion 822 described above), such as the abutment portion of the long rod portion 822.

[0075] For example, Figure 8 As shown, when the microswitch contacts the first contact point on the abutment, the long rod 822 of the valve cover 820 presses the microswitch, closing it and signaling the interlock. When the valve cover 820 opens, the microswitch separates from the first contact point on the abutment, flipping the microswitch open and disconnecting the interlock. This approach allows the existing long rod 822 of the leakage valve to be reused as the microswitch contact point, simplifying the valve design.

[0076] Accordingly, the micro switch can be Figure 8 As shown, it is located outside the cavity of the valve body 810 and is provided on the first end face of the valve body 810; alternatively, the micro switch can be as shown Figure 10As shown, it is located inside the cavity of the valve body 810 and is provided on the second end face of the valve body 810. The first end face (or second end face) here is the end face on the valve body 810, for example, the first end face is Figure 8 The end face where the micro switch is set, or the second end face is Figure 10 The end face where the micro switch is set.

[0077] For another example, a long rod can be added outside the cavity of the valve body 810 to serve as a contact point for the micro switch. Figure 11 As shown, the first contact point can be located at the second long rod 1110 of the valve cover 820. This approach can make the installation space of the micro switch more and the selection of the installation position more flexible.

[0078] Accordingly, the micro switch can be located outside the cavity of the valve body 810 and disposed on the first side of the valve body 810. For example, the first side can be Figure 11 The side where the micro switch setting is located.

[0079] For ease of understanding, the following Figure 3 , Figure 4 and Figure 8 , the functional principle of the liquid leakage valve provided in the embodiment of the present application is introduced in more detail with examples.

[0080] like Figure 8 As shown, when there is no liquid leakage in the battery pack, the switch of the micro switch is pressed by the long rod portion 822 of the valve cover 820 and is in a closed state. At this time, the interlock circuit is in a conducting state. Figure 3 As shown, the BMS can receive the interlock signal in the interlock circuit through the interlock signal test point, that is, the state of the interlock signal in the BMS is connected. When liquid leakage occurs in the battery pack, the liquid in the battery pack flows into the cavity of the valve body 810 through the hole 860, and the absorbent paper absorbs the liquid inside the cavity and expands, pushing the valve cover 820 open, and then the liquid inside the leakage valve is discharged to the outside of the battery pack. At this time, as the long rod part 822 of the valve cover 820 moves downward, the micro-switch separates from the long rod part 822, the switch of the micro-switch is popped open, and the interlock circuit is disconnected. Figure 4 As shown, the BMS cannot receive the interlock signal in the interlock circuit through the interlock signal test point, that is, the state of the interlock signal in the BMS is disconnected.

[0081] After the BMS detects the interlock signal is disconnected, it can perform subsequent processing to ensure the safety of the battery pack. For example, after the leakage valve opens, it can trigger a BMS alarm command (or high-voltage power off command), or trigger a high-voltage contactor to disconnect the high-voltage main circuit. Alternatively, it can stop the liquid cooling cycle or reduce the liquid cooling power output.

[0082] During the process of opening the valve cover 820, the spring inside the leakage valve is further compressed. Then, after the liquid inside the leakage valve is drained, the absorbent paper inside the leakage valve naturally dries and shrinks in volume, and the valve cover 820 can close the leakage valve with the elastic force of the spring. At this time, as the long rod portion 822 of the valve cover 820 moves upward, the micro switch contacts the long rod portion 822, and the switch of the micro switch is pressed to the closed state, and the interlock circuit is in the conductive state again. Figure 3 As shown, the BMS can receive the interlock signal in the interlock circuit through the interlock signal test point. After the BMS detects that the interlock signal is connected, the BMS can send relevant instructions to restore the normal operation of the battery pack.

[0083] An embodiment of the present application also provides a vehicle, which includes the alarm system introduced above.

[0084] An embodiment of the present application also provides a battery pack, which includes the alarm system introduced above.

[0085] Combined with the above Figures 1 to 11 , describes the device embodiment of the present application in detail, and the following is combined with Figure 12 , the method embodiment of the present application is described in detail. It should be understood that the description of the method embodiment corresponds to the description of the device embodiment, so for parts not described in detail, reference can be made to the previous device embodiment.

[0086] Figure 12 This is a flow chart of a method for alarming a leaking valve according to an embodiment of the present application. The alarm method is applied to an alarm system, which includes a control unit, a detection unit, and an alarm unit. A detailed description of the alarm system can be found above and will not be repeated here.

[0087] like Figure 12 As shown, the alarm method includes step S1210, step S1220 and step S1230.

[0088] In step S1210, the control unit controls the interlock circuit to be turned on or off according to the working state of the leakage valve. If the working state of the leakage valve is open, the interlock circuit is turned off; if the working state of the leakage valve is closed, the interlock circuit is turned on.

[0089] In step S1220, the detection unit detects whether there is an interlock signal in the interlock loop, and sends the detection result to the alarm unit.

[0090] In step S1230, the alarm unit determines the working state of the leakage valve according to the detection result, and issues an alarm based on the working state of the leakage valve.

[0091] In some implementations, the alarm unit determines the working status of the leakage valve based on the detection result, including: if the detection result indicates that there is no interlock signal in the interlock circuit, the alarm unit determines that the leakage valve is in the open state; and / or if the detection result indicates that there is an interlock signal in the interlock circuit, the alarm unit determines that the leakage valve is in the closed state.

[0092] In some implementations, the alarm unit issues an alarm based on the working status of the leaking valve, including:

[0093] If the alarm unit determines that the leakage valve is in the open state, it sends an alarm signal.

[0094] It should be understood that in the embodiments of the present application, "B corresponding to A" means that B is associated with A and B can be determined based on A. However, it should also be understood that determining B based on A does not mean determining B based solely on A, but B can also be determined based on A and / or other information.

[0095] It should be understood that the term "and / or" in this document simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0096] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0097] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0098] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0099] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0100] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be read by a computer or a data storage device such as a server or data center that includes one or more available media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital versatile disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0101] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A leak valve alarm system, characterized in that: include: a control unit, configured to control the interlock circuit to be turned on or off according to the working state of the leakage valve in the battery pack, wherein if the working state of the leakage valve is open, the interlock circuit is controlled to be turned off; if the working state of the leakage valve is closed, the interlock circuit is controlled to be turned on; a detection unit, configured to detect whether an interlock signal exists in the interlock circuit and send the detection result to an alarm unit; The alarm unit is used to determine the working status of the liquid leakage valve according to the detection result, and to issue an alarm based on the working status of the liquid leakage valve.

2. The alarm system according to claim 1, characterized in that: The interlock circuit further includes a high-voltage connection device connected in series with the liquid leakage valve.

3. The alarm system according to claim 1, characterized in that: The interlock circuit further includes a high-voltage connection device connected in parallel with the liquid leakage valve.

4. The alarm system according to claim 2 or 3, characterized in that: The liquid leakage valve is one of a plurality of liquid leakage valves, and the plurality of liquid leakage valves are connected in series in the interlocking circuit.

5. The alarm system according to claim 2 or 3, characterized in that: The liquid leakage valve is one of a plurality of liquid leakage valves, and the plurality of liquid leakage valves are connected in parallel in the interlocking circuit.

6. The alarm system according to claim 1, characterized in that: The control unit includes a micro switch, which is used to: When the valve cover of the leakage valve is opened, the micro switch is separated from the first contact point provided on the leakage valve to disconnect the interlocking circuit. When the valve cover is closed, the micro switch contacts the first contact point to connect the interlocking circuit.

7. A leak valve alarm method, characterized in that: The method is applied to an alarm system, which includes: a control unit, a detection unit and an alarm unit; The method comprises: The control unit controls the interlock circuit to be turned on or off according to the working state of the leakage valve, wherein if the working state of the leakage valve is open, the interlock circuit is controlled to be turned off; if the working state of the leakage valve is closed, the interlock circuit is controlled to be turned on; The detection unit detects whether there is an interlock signal in the interlock circuit and sends the detection result to the alarm unit; The alarm unit determines the working state of the liquid leakage valve according to the detection result, and issues an alarm based on the working state of the liquid leakage valve.

8. The method according to claim 7, characterized in that The alarm unit determines the working state of the liquid leakage valve according to the detection result, including: If the detection result indicates that there is no interlock signal in the interlock circuit, the alarm unit determines that the leakage valve is in an open state; and / or If the detection result indicates that an interlock signal exists in the interlock circuit, the alarm unit determines that the liquid leakage valve is in a closed state.

9. The method according to claim 7 or 8, characterized in that The alarm unit issues an alarm based on the working state of the liquid leakage valve, including: If the alarm unit determines that the working state of the leakage valve is the open state, an alarm signal is sent.

10. A vehicle, characterized in that: Comprising the alarm system according to any one of claims 1 to 6.

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