Liquid leakage valve detection system, battery pack and vehicle

Abstract

The invention provides a liquid leakage valve detection system, a battery pack and a vehicle. The detection system comprises a valve body; a valve cover; the expansion part is arranged in the cavity of the valve body, and the expansion part is used for absorbing the liquid in the valve body and then expanding to drive the valve cover to be opened, so that the liquid in the battery pack is discharged out of the battery pack; the elastic piece is used for closing the valve cover under the action of elastic force so as to close the liquid leakage valve; the control unit is used for controlling connection or disconnection of the interlocking loop according to the fact that the valve cover is in the open state or the closed state, if the valve cover is in the open state, the interlocking loop is controlled to be disconnected, and if the valve cover is in the closed state, the interlocking loop is controlled to be connected; and the detection unit is used for detecting whether the valve cover is in an opening state or a closing state according to whether the interlocking signal exists in the interlocking loop. According to the embodiment of the invention, the opening of the liquid leakage valve is detected based on the detection system, and subsequent treatment can be carried out in time, so that the use safety of the battery pack is improved.

Description

Technical Field

[0001] The present application relates to the field of detection technology, and in particular to a leakage valve detection system, 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 detection system, 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, a leakage valve detection system is provided, which includes: a valve body; a valve cover; an expansion member, which is arranged inside the cavity of the valve body, and the expansion member is used to: expand after absorbing the liquid inside the valve body to drive the valve cover to open, so that the liquid inside the battery pack can be discharged to the outside of the battery pack; an elastic member, which is used to close the valve cover under the action of elastic force to close the leakage valve; a control unit, which is used to control the conduction or disconnection of the interlocking circuit according to whether the valve cover is in an open state or a closed state, wherein if the valve cover is in an open state, the interlocking circuit is controlled to be disconnected, and if the valve cover is in a closed state, the interlocking circuit is controlled to be connected; a detection unit, which is used to detect whether the valve cover is in an open state or a closed state according to whether an interlocking signal exists in the interlocking circuit.

[0006] In some possible implementations, the control unit is arranged on the first end surface outside the cavity of the valve body, and the control unit includes a control switch. If the control switch is in the on state, the valve cover is in the closed state, and if the control switch is in the off state, the valve cover is in the open state; a first long rod is arranged in the cavity of the valve body, and one end of the first long rod is connected to the valve cover, wherein, if the valve cover is in the closed state, the other end of the first long rod abuts against the control switch, so that the control switch is in the on state; if the valve cover is in the open state, the first long rod does not abut against the control switch, so that the control switch is in the off state.

[0007] In some possible implementations, the control unit is arranged on the second end face inside the cavity of the valve body, and the control unit includes a control switch. If the control switch is in the on state, the valve cover is in the closed state, and if the control switch is in the off state, the valve cover is in the open state; a first long rod is arranged in the cavity of the valve body, and one end of the first long rod is connected to the valve cover, wherein, if the valve cover is in the closed state, the other end of the first long rod abuts against the control switch, so that the control switch is in the on state; if the valve cover is in the open state, the first long rod does not abut against the control switch, so that the control switch is in the off state.

[0008] In some possible implementations, the control unit is arranged on the first side outside the cavity of the valve body, and the control unit includes a control switch. If the control switch is in the on state, the valve cover is in the closed state, and if the control switch is in the off state, the valve cover is in the open state; a second long rod is arranged outside the cavity of the valve body, and one end of the second long rod is connected to the valve cover, wherein, if the valve cover is in the closed state, the other end of the second long rod abuts against the control switch, so that the control switch is in the on state; if the valve cover is in the open state, the second long rod does not abut against the control switch, so that the control switch is in the off state.

[0009] In some possible implementations, the first long rod passes through the center of the expansion member to position the expansion member.

[0010] In some possible implementations, the first long rod passes through the center of the elastic member, an abutment portion is provided at one end of the first long rod, and the elastic member contacts the abutment portion.

[0011] 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 interlocking circuit; when the valve cover of the leakage valve is closed, the micro-switch is contacted with the first contact point to conduct the interlocking circuit.

[0012] In some possible implementations, a sealing cabin is provided in the cavity of the valve body, and the sealing cabin is used to seal the cavity where the elastic member is located.

[0013] In a second aspect, a battery pack is provided, which includes the detection system in the first aspect.

[0014] In a third aspect, a vehicle is provided, comprising the battery pack according to the second aspect.

[0015] 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.

[0016] In the embodiment of the present application, a special detection system is provided in the leakage valve to detect the discharge action of the leakage valve. In this way, when the vehicle detects that the leakage valve is open according to the detection system, subsequent processing can be carried out in a timely manner, thereby helping to improve the safety of the battery pack during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a detection system provided in one embodiment of the present application.

[0018] Figure 2 A schematic structural diagram of a detection system provided in another embodiment of the present application.

[0019] Figure 3 A schematic structural diagram of a detection system provided in yet another embodiment of the present application.

[0020] Figure 4 A schematic block diagram of an interlocking loop provided in an embodiment of the present application.

[0021] Figure 5 A schematic diagram of a working state of the interlocking circuit provided in an embodiment of the present application.

[0022] Figure 6 A schematic diagram of another working state of the interlocking circuit provided in an embodiment of the present application.

[0023] Figure 7 This is a schematic diagram of the structure of the micro switch provided in an embodiment of the present application. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] To address the above-mentioned problem, the embodiment of the present application provides a special detection system in the leakage valve to detect the discharge action of the leakage valve. In this way, when the vehicle detects that the leakage valve is open according to the detection system, subsequent processing can be carried out in a timely manner, thereby helping to improve the safety of the battery pack during use.

[0035] Combined with the following Figure 1 The following describes in detail a leakage valve detection system provided in an embodiment of the present application. The detection system 100 can be applied to a battery pack.

[0036] like Figure 1 As shown, the detection system 100 includes a valve body 110, a valve cover 120, an expansion member 130, an elastic member 140, a control unit 150 and a detection unit (not shown in the figure).

[0037] The valve body 110 may also be referred to as a leakage valve body. In some embodiments, the valve body 110 of the leakage valve may include a hole 160. The position of the hole 160 may be as follows: Figure 1 When leakage occurs inside the battery pack, the liquid flows into the cavity of the valve body 110 through the hole 160 .

[0038] The valve cover 120, also known as the leakage valve cover, is used to open or close the leakage valve. For example, when the valve cover 120 is open, the leakage valve is open to drain liquid that has flowed into the cavity of the valve body 110 to the outside of the battery pack; when the valve cover 120 is closed, the leakage valve is closed.

[0039] The expansion member 130 is disposed within the cavity of the valve body 110. After absorbing liquid (such as leaked coolant) within the valve body 110, it expands to open the valve cover 120, allowing the liquid inside the battery pack to drain out. If the expansion member 130 has not absorbed liquid, or if the expansion member 130 has dried after absorbing liquid, it will not exert force on the valve cover 120. For example, the expansion member 130 can be a piece of absorbent paper.

[0040] Elastic member 140 is used to close valve cover 120 under the action of elastic force, thereby closing the leaking valve. For example, after absorbing liquid, expansion member 130 expands, driving valve cover 120 to open while further compressing elastic member 140. When the liquid in valve body 110 is drained and expansion member 130 dries, the force acting on it disappears. At this point, elastic member 140 can close valve cover 120 under the action of elastic force, and this elastic force keeps valve cover 120 closed. For example, elastic member 140 can be a spring.

[0041] The control unit 150 is configured to control the interlock circuit to be open or closed according to whether the valve cover 120 is in an open state or a closed state. If the valve cover 120 is in an open state, the interlock circuit is controlled to be open; if the valve cover 120 is in a closed state, the interlock circuit is controlled to be open.

[0042] A detection unit is configured to detect whether the valve cover 120 is in an open or closed state based on whether an interlock signal is present in the interlock circuit. For example, if the detection unit detects the presence of an interlock signal in the interlock circuit, the valve cover 120 is in a closed state; alternatively, if the detection unit does not detect an interlock signal in the interlock circuit, the valve cover 120 is in an open state. In other words, the detection unit can detect the discharge action of the leakage valve. Exemplarily, the detection unit may be a battery management system (BMS).

[0043] Furthermore, the detection unit can also send a related prompt signal to the vehicle's control system after detecting the leakage valve's discharge action. In this way, when the vehicle detects that the leakage valve is open based on the detection unit, subsequent processing can be carried out in a timely manner, thereby helping to improve the safety of the battery pack during use.

[0044] 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.

[0045] In addition to the above components, the liquid leakage valve may also include other components, such as a sealing chamber 170, a sealing ring 180, and a long rod portion 122 on the valve cover 120. The sealing chamber 170 is used to isolate the control unit 150 and the elastic member 140 from the liquid inside the valve body 110, so as to prevent the liquid from corroding the control unit 150 and the elastic member 140. The sealing ring 180 is arranged at the position (gap) where the valve body 110 and the valve cover 120 contact each other to prevent liquid from leaking from the gap between the two. The long rod portion 122 on the valve cover 120 is arranged inside the cavity of the valve body 110. Figure 1 As shown, the long rod portion 122 passes through the center of the elastic member 140. One end of the long rod portion 122 is provided with an abutment, with which the elastic member 140 contacts. When the abutment moves toward the direction in which the valve cover 120 opens, it compresses the elastic member 140, generating an elastic force. Furthermore, the long rod portion 122 also passes through the center of the expansion member 130. This helps position the expansion member 130 and prevents the expansion member 130 from tilting, which could cause uneven force on the valve cover 120 and lead to inconsistent opening angles on both sides of the valve cover 120.

[0046] In some embodiments, the control unit 150 may include a control switch. The control switch functions as follows: if the control switch is in the on state, the valve cover 120 is in the closed state; if the control switch is in the off state, the valve cover 120 is in the open state. In other words, when the valve cover 120 is closed, the control switch is closed, and the interlock circuit is in the on state; when the valve cover 120 is open, the control switch is off, and the interlock circuit is in the off state.

[0047] The control unit 150 can be arranged on the liquid leakage valve, or in other words, the control switch of the control unit 150 can be arranged on the liquid leakage valve. For example, the control unit 150 can be arranged in the cavity of the valve body or outside the cavity of the valve body.

[0048] Taking the control unit 150 including a control switch as an example, the control switch can be located outside the cavity of the valve body 110 and set on the first end surface of the valve body 110. Alternatively, the control switch can be located inside the cavity of the valve body 110 and set on the second end surface of the valve body 110. The first end surface and the second end surface here are end surfaces formed by one end of the valve body 110. For example, the first end surface is Figure 1 The end face where the control unit 150 is located. For example, the second end face is Figure 2 The end surface where the control unit 150 is located.

[0049] A first long rod (i.e., the long rod portion 122) is provided in the cavity of the valve body 110, and one end of the first long rod is connected to the valve cover 120. If the valve cover 120 is in the closed state, the other end of the first long rod abuts against the control switch, causing the control switch to be in the on state; if the valve cover 120 is in the open state, the first long rod does not abut against the control switch, causing the control switch to be in the off state. In other words, the control switch can be closed or disconnected by cooperating with the long rod portion 122, thereby realizing the on and off of the interlocking circuit. This method can reuse the existing long rod portion 122 of the leakage valve to realize the function of the control switch, making the design of the leakage valve simpler.

[0050] Alternatively, the control switch may be located outside the cavity of the valve body 110 and disposed on the first side of the valve body 110. For example, the first side may be Figure 3 The side where the control unit 150 is located.

[0051] A second long rod is provided outside the cavity of the valve body 110, and one end of the second long rod is connected to the valve cover 120. If the valve cover 120 is in the closed state, the other end of the second long rod abuts against the control switch, so that the control switch is in the on state; if the valve cover 120 is in the open state, the second long rod does not abut against the control switch, so that the control switch is in the off state. For example, the second long rod can be Figure 3 In other words, the control switch can be closed or opened by cooperating with the second long rod, thereby realizing the conduction and disconnection of the interlock circuit. This method can make the installation space of the controllable switch more flexible and the choice of installation location more flexible.

[0052] In some embodiments, as Figure 4 As shown, the interlock circuit 400 may include: a power supply unit 410 , a control switch 420 and a signal acquisition unit 430 .

[0053] The power supply unit 410 is used to provide an interlocking signal to the interlocking circuit 400 , or in other words, to provide a voltage to the interlocking circuit 400 .

[0054] The control switch 420 is used to disconnect the interlock circuit 400 in response to the opening of the leakage valve; and to connect the interlock circuit 400 in response to the closing of the leakage valve.

[0055] The signal acquisition unit 430 is used to send the interlock signal in the interlock circuit 400 to the detection unit.

[0056] For example, Figure 5 and Figure 6 The diagram shows two working states of the interlocking circuit. Figure 5 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 6 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.

[0057] The embodiment of the present application does not limit the type of control switch 420, as long as it can control the on and off of the interlock circuit 400. In some embodiments, the control switch 420 can be a mechanical switch. Alternatively, the control switch 420 can also be a magnetic switch.

[0058] For example, the control switch 420 may be a microswitch. The microswitch is configured to: when the valve cover 120 of the leaking valve is open, separate the microswitch from a first contact point provided on the leaking valve to disconnect the interlock circuit 400; and when the valve cover 120 of the leaking valve is closed, contact the first contact point to connect the interlock circuit 400. In other words, in the interlock circuit 400, the opening or closing of the microswitch can control the disconnection or connection of the interlock signal in the interlock circuit 400. The first contact point may be located at the position where the first long rod (or second long rod) mentioned above contacts the microswitch.

[0059] The microswitch uses a contact mechanism to switch the circuit on and off. That is, when subjected to sufficient force, the contacts will quickly switch from one state to another (for example, from open to closed). This action characteristic enables the microswitch to accurately respond to the opening of the leakage valve, thereby helping to improve the accuracy of the detection device.

[0060] For example, Figure 7 Figure 1 shows a schematic diagram of the structure of a micro switch. Figure 7 As shown, when the micro-switch 700 is not turned on, its switch 710 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 700 is turned on, its switch 710 is in a popped-open state (i.e., separated from the first contact point), and the interlock signal in the interlock circuit is disconnected.

[0061] For ease of understanding, the following Figure 1 , Figure 5 and Figure 6 , the functional principles of the detection system provided in the embodiments of the present application are introduced in more detail with examples.

[0062] like Figure 1 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 122 of the valve cover 120 and is in a closed state. At this time, the interlock circuit is in a conducting state. Figure 5 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 110 through the hole 160, and the absorbent paper absorbs the liquid inside the cavity and expands, pushing the valve cover 120 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 122 of the valve cover 120 moves downward, the micro switch separates from the long rod part 122, the switch of the micro switch is popped open, and the interlock circuit is disconnected. Figure 6 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.

[0063] 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 the BMS to issue a high-voltage power-off command (or warning 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.

[0064] During the process of opening the valve cover 120, 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 120 can close the leakage valve with the elastic force of the spring. At this time, as the long rod portion 122 of the valve cover 120 moves upward, the micro switch contacts the long rod portion 122, and the switch of the micro switch is pressed to the closed state, and the interlock circuit is in the conductive state again. Figure 5 As shown, the BMS can receive the interlock signal in the interlock loop through the interlock signal test point.

[0065] An embodiment of the present application also provides a battery pack, which includes the detection system introduced above.

[0066] An embodiment of the present application also provides a vehicle, which includes the battery pack introduced above.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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)).

[0074] 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 leakage valve detection system, characterized in that: include: Valve body; Valve cover; an expansion member disposed inside the cavity of the valve body, the expansion member being configured to expand after absorbing liquid inside the valve body to drive the valve cover to open, so as to allow the liquid inside the battery pack to be discharged to the outside of the battery pack; an elastic member, used to close the valve cover under the action of elastic force, so as to close the liquid leakage valve; a control unit, configured to control the interlock circuit to be turned on or off according to whether the valve cover is in an open state or a closed state, wherein if the valve cover is in an open state, the interlock circuit is controlled to be turned off, and if the valve cover is in a closed state, the interlock circuit is controlled to be turned on; The detection unit is used to detect whether the valve cover is in an open state or a closed state according to whether an interlock signal exists in the interlock circuit.

2. The detection system according to claim 1, characterized in that The control unit is arranged on the first end surface outside the cavity of the valve body, and the control unit includes a control switch. If the control switch is in the on state, the valve cover is in the closed state, and if the control switch is in the off state, the valve cover is in the open state; A first long rod is provided in the cavity of the valve body, and one end of the first long rod is connected to the valve cover, wherein, if the valve cover is in a closed state, the other end of the first long rod abuts against the control switch, so that the control switch is in a conducting state; if the valve cover is in an open state, the first long rod does not abut against the control switch, so that the control switch is in a disconnected state.

3. The detection system according to claim 1, characterized in that The control unit is arranged on the second end surface inside the cavity of the valve body, and the control unit includes a control switch. If the control switch is in the on state, the valve cover is in the closed state, and if the control switch is in the off state, the valve cover is in the open state; A first long rod is provided in the cavity of the valve body, and one end of the first long rod is connected to the valve cover, wherein, if the valve cover is in a closed state, the other end of the first long rod abuts against the control switch, so that the control switch is in a conducting state; if the valve cover is in an open state, the first long rod does not abut against the control switch, so that the control switch is in a disconnected state.

4. The detection system according to claim 1, characterized in that The control unit is arranged on a first side surface outside the cavity of the valve body, and the control unit includes a control switch. If the control switch is in an on state, the valve cover is in a closed state, and if the control switch is in an off state, the valve cover is in an open state; A second long rod is provided outside the cavity of the valve body, and one end of the second long rod is connected to the valve cover, wherein, if the valve cover is in a closed state, the other end of the second long rod abuts against the control switch, so that the control switch is in a conducting state; if the valve cover is in an open state, the second long rod does not abut against the control switch, so that the control switch is in a disconnected state.

5. The detection system according to claim 2 or 3, characterized in that: The first long rod passes through the center of the expansion member to position the expansion member.

6. The detection system according to claim 5, characterized in that: The first long rod passes through the center of the elastic member. An abutment portion is provided at one end of the first long rod, and the elastic member contacts the abutment portion.

7. The detection 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 liquid leakage valve is opened, the micro-switch is separated from the first contact point provided on the liquid leakage valve to disconnect the interlocking circuit. When the valve cover of the liquid leakage valve is closed, the micro-switch contacts the first contact point to connect the interlocking circuit.

8. The detection system according to claim 1, characterized in that A sealing cabin is provided in the cavity of the valve body, and the sealing cabin is used to seal the cavity where the elastic member is located.

9. A battery pack, characterized in that: Comprising the detection system according to any one of claims 1 to 8.

10. A vehicle, characterized in that: Comprising the battery pack as claimed in claim 9.

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