Liquid leakage detection circuit, battery device and electric device

Abstract

The invention discloses a liquid leakage detection circuit, a battery device and a power utilization device, and the power supply circuit comprises an induction circuit, the output end of the induction circuit is electrically connected with the input end of a wake-up circuit and the first input end of a processor, and the induction circuit is used for inducting whether a battery pack leaks liquid or not; the output end of the wake-up circuit is electrically connected with the second input end of the processor, and the wake-up circuit is used for waking up the processor when the processor is in a dormant state and the induction circuit induces that the battery pack leaks liquid; and the processor is used for collecting electrical parameters of the output end of the induction circuit and determining a final liquid leakage detection result of the battery pack based on the electrical parameters. Therefore, whether the battery pack leaks liquid or not is accurately detected, and whether the battery pack leaks liquid or not can be detected regardless of whether the processor is dormant or not.

Description

Technical Field

[0001] The present application relates to the field of circuit technology, and in particular to a liquid leakage detection circuit, a battery device and an electrical device. Background Art

[0002] If a battery pack leaks, such as coolant leakage or electrolyte leakage, it may cause battery short circuit, damage, explosion and other accidents. In order to improve the reliability of the battery pack, it is necessary to detect whether the battery pack is leaking.

[0003] Therefore, a solution for leak detection of battery packs is needed. Summary of the invention

[0004] The present application provides a power supply circuit, a battery system and an electrical device, which can accurately detect whether a battery pack is leaking, and can detect whether the battery pack is leaking regardless of whether the processor is in sleep mode.

[0005] In a first aspect, the present application provides a power supply circuit, comprising: a sensing circuit, wherein the output end of the sensing circuit is electrically connected to the input end of the wake-up circuit and the first input end of the processor, respectively, for sensing whether a battery pack is leaking; a wake-up circuit, wherein the output end of the wake-up circuit is electrically connected to the second input end of the processor, for waking up the processor when the processor is in a sleep state and the sensing circuit senses that the battery pack is leaking; a processor, for collecting electrical parameters of the output end of the sensing circuit, and determining a final leakage detection result of the battery pack based on the electrical parameters; the sensing circuit comprises: a first voltage divider, wherein the first end of the first voltage divider is electrically connected to the first power supply, and the second end of the first voltage divider is electrically connected to the input end of the wake-up circuit, the first input end of the processor, and the first end of the second voltage divider, respectively; a second voltage divider, wherein the second end of the second voltage divider is grounded, for outputting a first electrical parameter when leakage occurs in the battery pack, and outputting a second electrical parameter when no leakage occurs in the battery pack, the first electrical parameter being different from the second electrical parameter.

[0006] In the embodiment of the present application, if the processor is in a working state, the processor can directly collect the electrical parameters at the output end of the sensing circuit, and determine the final leakage detection result of the battery pack based on the electrical parameters; if the processor is in a dormant state, when the sensing circuit senses that the battery pack is leaking, the wake-up circuit can wake up the processor, so that the processor enters a working state, and then the processor can collect the electrical parameters at the output end of the sensing circuit, and determine the final leakage detection result of the battery pack based on the electrical parameters. In this way, accurate detection of whether the battery pack is leaking is achieved, and detection of whether the battery pack is leaking can be achieved regardless of whether the processor is dormant.

[0007] In the embodiment of the present application, voltage division is achieved by a first voltage divider and a second voltage divider, so that the sensing circuit can indicate whether the battery pack is leaking by outputting different electrical parameters.

[0008] In a possible implementation of the first aspect, the second voltage divider includes: a liquid leakage sensor, a first end of the liquid leakage sensor is electrically connected to the input end of the wake-up circuit, the first input end of the processor and the second end of the first voltage divider, and the second end of the liquid leakage sensor is grounded.

[0009] In the embodiment of the present application, the leakage sensor can be used to sense whether the battery pack is leaking, and the leakage sensor and the first voltage divider can be used to divide the voltage, thereby reflecting whether the battery pack is leaking.

[0010] In a possible implementation of the first aspect, the second voltage divider also includes: a voltage divider element, wherein the first end of the voltage divider element is electrically connected to the first end of the leakage sensor, the input end of the wake-up circuit, the first input end of the processor and the second end of the first voltage divider, and the second end of the voltage divider element is electrically connected to the second end of the leakage sensor.

[0011] In the embodiment of the present application, by providing the second voltage divider including a leakage sensor and a voltage dividing element, it is possible to more accurately reflect whether leakage occurs in the battery pack.

[0012] In a possible implementation of the first aspect, the liquid leakage sensor includes multiple resistors.

[0013] In the embodiment of the present application, leakage detection can be performed on multiple locations in the battery pack through multiple resistors, thereby performing leakage detection on the battery pack more comprehensively.

[0014] In a possible implementation of the first aspect, a plurality of resistors are connected in parallel.

[0015] In the embodiment of the present application, multiple resistors are connected in parallel as leakage sensors, so that the electrical parameters at the output end of the sensing circuit can more accurately reflect whether the battery pack is leaking.

[0016] In a possible implementation of the first aspect, the wake-up circuit includes: a comparator, a first input terminal of the comparator being electrically connected to the second end of the first voltage divider and the first end of the second voltage divider, respectively, a second input terminal of the comparator being electrically connected to a second power supply, an output terminal of the comparator being electrically connected to an input terminal of a wake-up device, and being configured to output a third electrical parameter when the first input terminal of the comparator receives a first electrical parameter; and a wake-up device, an output terminal of the wake-up device being electrically connected to a second input terminal of a processor, and being configured to wake up the processor when the processor is in a sleep state and the wake-up device receives a third electrical parameter.

[0017] In an embodiment of the present application, in the event of a battery pack leakage, the second voltage divider will output a first electrical parameter, so that the first input end of the comparator receives the first electrical parameter. When the first input end of the comparator receives the first electrical parameter, the output end of the comparator can output a third electrical parameter, and the wake-up device can wake up the processor when it receives the third electrical parameter. In this way, the processor can be woken up in the event of a battery pack leakage, thereby realizing timely detection of battery pack leakage when the processor is in a sleep state.

[0018] In a possible implementation of the first aspect, the wake-up circuit also includes: a third voltage divider, a first end of the third voltage divider is electrically connected to the second power supply, and a second end of the third voltage divider is electrically connected to the second input end of the comparator and the first end of the fourth voltage divider respectively; a fourth voltage divider, a second end of the fourth voltage divider is grounded.

[0019] In an embodiment of the present application, a third voltage divider and a fourth voltage divider are set at the second input terminal of the comparator for voltage division, so that the voltage of the second input terminal of the comparator can be determined, and the voltage is used as a reference voltage of the comparator, thereby designing the first input terminal of the comparator so that the output terminal of the comparator can output a high level when the battery pack leaks, and output a low level when the battery pack does not leak.

[0020] In a possible implementation of the first aspect, the electrical parameter includes voltage, and the processor is used to: when the voltage is less than a preset voltage, determine that a final leakage detection result of the battery pack is that leakage has occurred; when the voltage is greater than or equal to the preset voltage, determine that the final leakage detection result of the battery pack is that no leakage has occurred.

[0021] In the embodiment of the present application, the processor can accurately determine whether the battery pack is leaking based on the voltage at the output end of the sensing circuit.

[0022] In a possible implementation of the first aspect, the processor is further used to: send a thermal runaway detection instruction to the thermal runaway detection circuit, so that the thermal runaway detection circuit performs thermal runaway detection on the battery pack to obtain a thermal runaway detection result.

[0023] In an embodiment of the present application, a processor may send a thermal runaway detection instruction to a thermal runaway detection circuit, triggering the thermal runaway detection circuit to perform thermal runaway detection on the battery pack, so that thermal runaway may be detected in time when the battery pack is in thermal runaway.

[0024] In a possible implementation of the first aspect, the processor is further configured to: output alarm information when the final liquid leakage detection result is that liquid leakage has occurred and / or the thermal runaway detection result is that thermal runaway has occurred.

[0025] In an embodiment of the present application, the processor can output an alarm message when the battery pack leaks and / or thermal runaway occurs, so as to remind the user to take timely measures to reduce safety risks.

[0026] Based on the same inventive concept, in a second aspect, an embodiment of the present application further provides a battery device, the battery device comprising a battery and a leakage detection circuit as described in any one embodiment of the first aspect.

[0027] In a possible implementation of the second aspect, the leakage detection circuit includes a leakage sensor, the leakage sensor includes a resistor, and the resistor is disposed in a groove located at the bottom of the inner side of the battery device.

[0028] Since liquid tends to flow to lower places, a groove is provided at the bottom of the inner side of the battery device in the embodiment of the present application. When the battery device leaks, the liquid can flow into the groove. The resistor is provided in the groove, so that the leakage of the battery device can be sensed more promptly.

[0029] Based on the same inventive concept, in a third aspect, an embodiment of the present application further provides an electrical device, the electrical device comprising a battery device as described in any one of the embodiments of the second aspect.

[0030] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings: Figure 1 One of the structural schematic diagrams of a liquid leakage detection circuit provided in some embodiments of the present application; Figure 2 A second structural schematic diagram of a liquid leakage detection circuit provided in some embodiments of the present application; Figure 3 A third structural diagram of a liquid leakage detection circuit provided in some embodiments of the present application; Figure 4 A fourth structural diagram of a liquid leakage detection circuit provided in some embodiments of the present application; Figure 5 A fifth structural diagram of a liquid leakage detection circuit provided in some embodiments of the present application; Figure 6A sixth structural diagram of a liquid leakage detection circuit provided in some embodiments of the present application; Figure 7 A seventh structural diagram of a liquid leakage detection circuit provided in some embodiments of the present application; Figure 8 A schematic diagram of a module structure of a battery device provided in some embodiments of the present application. DETAILED DESCRIPTION

[0032] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0034] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0035] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0036] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0037] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0038] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0039] At present, batteries are increasingly used. If a battery pack leaks, such as coolant leakage or electrolyte leakage, it may cause battery short circuit, damage, explosion, and other accidents. In order to improve the reliability of the battery pack, it is necessary to detect whether the battery pack is leaking. Therefore, a solution for battery pack leakage detection is needed.

[0040] In order to solve the above technical problems, in the related art, leakage detection is generally completed by the microcontroller unit (MCU) in the battery management system (BMS). The MCU needs to control the excitation source circuit to continuously send an excitation signal to stimulate the signal detection circuit to detect battery pack leakage, but this requires the MCU to be in working state all the time and consumes a lot of power. In practice, the MCU is likely to be in a dormant state. For example, if the battery pack is the power battery of the vehicle, when the vehicle is not started, the BMS is in a dormant state, so the MCU will also be in a dormant state and cannot perform leakage detection, thereby failing to detect battery pack leakage in time. In addition, the circuits in the related art are relatively complex.

[0041] In order to solve the problem that the MCU is always in working state and consumes a lot of power, and that the battery pack leakage cannot be detected in time when the MCU is in sleep state, the embodiment of the present application provides a leakage detection circuit, a battery device and an electrical device, and the leakage detection circuit includes a sensing circuit, a wake-up circuit and a processor. Among them, the output end of the sensing circuit is electrically connected to the input end of the wake-up circuit and the first input end of the processor respectively, and is used to sense whether the battery pack is leaking; the output end of the wake-up circuit is electrically connected to the second input end of the processor, and is used to wake up the processor when the processor is in sleep state and the sensing circuit senses that the battery pack is leaking; the processor is used to collect the electrical parameters of the output end of the sensing circuit, and determine the final leakage detection result of the battery pack based on the electrical parameters.

[0042] Therefore, if the processor is in a working state, the processor can directly collect the electrical parameters at the output end of the sensing circuit, and determine the final leakage detection result of the battery pack based on the electrical parameters; if the processor is in a dormant state, when the sensing circuit senses that the battery pack is leaking, the wake-up circuit can wake up the processor and put the processor into a working state, and then the processor can collect the electrical parameters at the output end of the sensing circuit, and determine the final leakage detection result of the battery pack based on the electrical parameters. In this way, accurate detection of whether the battery pack is leaking is achieved, and detection of whether the battery pack is leaking can be achieved regardless of whether the processor is dormant. In addition, the leakage detection circuit does not require an excitation source, and the circuit structure is relatively simple.

[0043] The following is a detailed introduction to the liquid leakage detection circuit provided in the embodiments of the present application.

[0044] Figure 1 One of the structural schematic diagrams of the liquid leakage detection circuit provided in some embodiments of the present application, such as Figure 1 As shown, the liquid leakage detection circuit may include: a sensing circuit 110 , a wake-up circuit 120 and a processor 130 .

[0045] The output end of the sensing circuit 110 may be electrically connected to the input end of the wake-up circuit 120 and the first input end of the processor 130 respectively, and may be used to sense whether the battery pack is leaking.

[0046] The sensing circuit 110 or some components in the sensing circuit 110 may be disposed inside the battery pack.

[0047] The liquid leakage may include at least one of electrolyte leakage, coolant leakage, and other liquid leakage.

[0048] The output end of the wake-up circuit 120 may be electrically connected to the second input end of the processor 130 , and may be used to wake up the processor 130 when the processor 130 is in a sleep state and the sensing circuit 110 senses that the battery pack is leaking.

[0049] The processor 130 may be used to collect electrical parameters at the output end of the sensing circuit 110 , and determine a final leakage detection result of the battery pack based on the electrical parameters.

[0050] For example, Figure 2 As shown, the processor 130 may be an MCU.

[0051] The electrical parameter may include at least one of voltage, current, resistance, and other electrical parameters.

[0052] The final leakage detection result can indicate whether the battery pack is leaking.

[0053] Specifically, if the processor 130 is in a dormant state, when the sensing circuit 110 senses that the battery pack is leaking, the wake-up circuit 120 can wake up the processor 130. Since the processor 130 may be woken up for more than one reason, the processor 130 is not necessarily woken up because the battery pack is leaking. Therefore, after being woken up, the processor 130 can further confirm whether the battery pack is leaking through the electrical parameters of the output end of the sensing circuit 110.

[0054] In the embodiment of the present application, if the processor is in a working state, the processor can directly collect the electrical parameters at the output end of the sensing circuit, and determine the final leakage detection result of the battery pack based on the electrical parameters; if the processor is in a dormant state, when the sensing circuit senses that the battery pack is leaking, the wake-up circuit can wake up the processor, so that the processor enters a working state, and then the processor can collect the electrical parameters at the output end of the sensing circuit, and determine the final leakage detection result of the battery pack based on the electrical parameters. In this way, accurate detection of whether the battery pack is leaking is achieved, and detection of whether the battery pack is leaking can be achieved regardless of whether the processor is dormant.

[0055] In some embodiments of the present application, Figure 3 As shown, the sensing circuit 110 may include: a first voltage divider 111 and a second voltage divider 112 .

[0056] The first end of the first voltage divider 111 can be electrically connected to the first power supply Vc1, and the second end of the first voltage divider 111 can be electrically connected to the input end of the wake-up circuit 120, the first input end of the processor 130 and the first end of the second voltage divider 112 respectively.

[0057] For example, Figure 2 As shown, the first voltage divider 111 may be a resistor, and the resistance value of the resistor may be set according to actual requirements.

[0058] The first power source Vc1 may be a normal power source.

[0059] The second end of the second voltage divider 112 can be grounded, and can be used to output a first electrical parameter when leakage occurs in the battery pack, and output a second electrical parameter when no leakage occurs in the battery pack. The first electrical parameter can be different from the second electrical parameter.

[0060] The first electrical parameter may include at least one of voltage, current, resistance, and other electrical parameters.

[0061] The second electrical parameter may include at least one of voltage, current, resistance, and other electrical parameters.

[0062] The first electrical parameter and the second electrical parameter may be the same electrical parameter, but have different specific values.

[0063] In the embodiment of the present application, voltage division is achieved by a first voltage divider and a second voltage divider, so that the sensing circuit can indicate whether the battery pack is leaking by outputting different electrical parameters.

[0064] In some embodiments of the present application, Figure 4 As shown, the second voltage divider 112 may include: a liquid leakage sensor 1121 .

[0065] The first end of the liquid leakage sensor 1121 can be electrically connected to the input end of the wake-up circuit 120, the first input end of the processor 130 and the second end of the first voltage divider 111 respectively, and the second end of the liquid leakage sensor 1121 can be grounded.

[0066] The leakage sensor 1121 may be disposed inside the battery pack.

[0067] For example, Figure 2 As shown, the leakage sensor 1121 may include a resistor, and the resistance of the resistor itself may be set according to actual needs. The resistance of the resistor may be different when the battery pack is leaking and when it is not leaking. For example, the resistance of the resistor when the battery pack is leaking is less than the resistance when the battery pack is not leaking. Of course, the resistor may also be a resistor whose resistance when the battery pack is leaking is greater than the resistance when the battery pack is not leaking.

[0068] In the embodiment of the present application, the leakage sensor can be used to sense whether the battery pack is leaking, and the leakage sensor and the first voltage divider can be used to divide the voltage, thereby reflecting whether the battery pack is leaking.

[0069] In some embodiments of the present application, Figure 5 As shown, the second voltage divider 112 may further include: a voltage dividing element 1122 .

[0070] The first end of the voltage divider element 1122 can be electrically connected to the first end of the leakage sensor 1121, the input end of the wake-up circuit 120, the first input end of the processor 130 and the second end of the first voltage divider 111 respectively, and the second end of the voltage divider element 1122 can be electrically connected to the second end of the leakage sensor 1121.

[0071] That is to say, the second voltage divider 112 may include only the liquid leakage sensor 1121 , or may include the liquid leakage sensor 1121 and the voltage dividing element 1122 .

[0072] For example, Figure 2 As shown, the voltage dividing element 1122 may be a resistor, and the resistance value of the resistor may be set according to actual requirements.

[0073] In the embodiment of the present application, by providing the second voltage divider including a leakage sensor and a voltage dividing element, it is possible to more accurately reflect whether leakage occurs in the battery pack.

[0074] In some embodiments of the present application, the liquid leakage sensor may include multiple resistors.

[0075] Multiple resistors can be set at different leakage detection points in the battery pack.

[0076] In the embodiment of the present application, leakage detection can be performed on multiple locations in the battery pack through multiple resistors, thereby performing leakage detection on the battery pack more comprehensively.

[0077] In some embodiments of the present application, Figure 2 As shown, multiple resistors (VR1, VR2…VRn) can be connected in parallel.

[0078] In the embodiment of the present application, multiple resistors are connected in parallel as leakage sensors, so that the electrical parameters at the output end of the sensing circuit can more accurately reflect whether the battery pack is leaking.

[0079] In some embodiments of the present application, multiple resistors may also be connected in series.

[0080] In some embodiments of the present application, some of the multiple resistors may be connected in parallel, and some of the resistors may be connected in series.

[0081] In some embodiments of the present application, Figure 6 As shown, the wake-up circuit 120 may include: a comparator 121 and a wake-up device 122 .

[0082] Among them, the first input end of the comparator 121 can be electrically connected to the second end of the first voltage divider 111 and the first end of the second voltage divider 112 respectively, the second input end of the comparator 121 can be electrically connected to the second power supply Vc2, and the output end of the comparator 121 can be electrically connected to the input end of the wake-up device 122, and can be used to output a third electrical parameter when the first input end of the comparator 121 receives the first electrical parameter.

[0083] The first input terminal of the comparator 121 is a positive input terminal, and the second input terminal is a negative input terminal; or, the first input terminal of the comparator 121 is a negative input terminal, and the second input terminal is a positive input terminal.

[0084] For example, Figure 2 As shown, the first input terminal of the comparator 121 may be a negative input terminal, and the second input terminal may be a positive input terminal.

[0085] The comparator 121 is a low power device. Therefore, when the processor 130 and the wake-up device 122 are in a sleep state, the comparator 121 can be powered by the second power supply Vc2 and the first power supply Vc1 to keep the comparator 121 in an operating state.

[0086] The second power source Vc2 may also be a normal power source. The second power source Vc2 and the first power source Vc1 may be the same power source or different power sources.

[0087] The third electrical parameter may be a high level.

[0088] The output terminal of the wake-up device 122 may be electrically connected to the second input terminal of the processor 130 , and may be used to wake up the processor 130 when the processor 130 is in a sleep state and the wake-up device 122 receives a third electrical parameter.

[0089] When the wake-up device 122 is in a sleep state, it can be awakened by a high level. After being awakened, the wake-up device 122 can wake up the processor 130 .

[0090] For example, Figure 2 As shown, the wake-up device 122 may be a power management system basic chip (System Basis Chip, SBC). SBC is a basic chip that integrates multiple functions. SBC can be used to control the power supply for the MCU. SBC can wake up the MCU by controlling the power supply for the MCU.

[0091] In an embodiment of the present application, in the event of a battery pack leakage, the second voltage divider will output a first electrical parameter, so that the first input end of the comparator receives the first electrical parameter. When the first input end of the comparator receives the first electrical parameter, the output end of the comparator can output a third electrical parameter, and the wake-up device can wake up the processor when it receives the third electrical parameter. In this way, the processor can be woken up in the event of a battery pack leakage, thereby realizing timely detection of battery pack leakage when the processor is in a sleep state.

[0092] In some embodiments of the present application, Figure 7 As shown, the wake-up circuit 120 may further include: a third voltage divider 123 and a fourth voltage divider 124 .

[0093] The first end of the third voltage divider 123 may be electrically connected to the second power supply Vc2 , and the second end of the third voltage divider 123 may be electrically connected to the second input end of the comparator 121 and the first end of the fourth voltage divider 124 , respectively.

[0094] For example, Figure 2 As shown, the third voltage divider 123 may be a resistor, and the resistance value of the resistor may be set according to actual requirements.

[0095] A second terminal of the fourth voltage divider 124 may be grounded.

[0096] For example, Figure 2 As shown, the fourth voltage divider 124 may be a resistor, and the resistance value of the resistor may be set according to actual requirements.

[0097] In an embodiment of the present application, a third voltage divider and a fourth voltage divider are set at the second input terminal of the comparator for voltage division, so that the voltage of the second input terminal of the comparator can be determined, and the voltage is used as a reference voltage of the comparator, thereby designing the first input terminal of the comparator so that the output terminal of the comparator can output a high level when the battery pack leaks, and output a low level when the battery pack does not leak.

[0098] In some embodiments of the present application, the electrical parameter may include voltage, and the processor may be specifically used to: When the voltage is less than the preset voltage, determining that the final leakage detection result of the battery pack is leakage; When the voltage is greater than or equal to the preset voltage, it is determined that the final leakage detection result of the battery pack is that no leakage occurs.

[0099] Here, the electrical parameter of the output terminal of the sensing circuit may include voltage.

[0100] The resistance of the leakage sensor can be reduced when the battery pack leaks. Therefore, if the battery pack leaks, the voltage at the output end of the sensing circuit will decrease to less than the preset voltage; if the battery pack does not leak, the voltage at the output end of the sensing circuit will be greater than or equal to the preset voltage.

[0101] The preset voltage can be set according to actual needs.

[0102] In the embodiment of the present application, the processor can accurately determine whether the battery pack is leaking based on the voltage at the output end of the sensing circuit.

[0103] In some embodiments of the present application, all devices except the leakage sensor in the leakage detection circuit can be devices in the BMS. When the BMS is in sleep mode, the SBC and MCU can both be in sleep mode, but since the power supply of the two input terminals of the comparator is always on, the comparator is in working state.

[0104] In some embodiments of the present application, if the MCU is in a working state, the voltage at the output end of the sensing circuit can be collected. If the voltage is less than a preset voltage, it can be determined that the final leakage detection result of the battery pack is that leakage has occurred; if the voltage is greater than or equal to the preset voltage, it can be determined that the final leakage detection result of the battery pack is that no leakage has occurred.

[0105] In some embodiments of the present application, if the MCU is in a dormant state, when the battery pack does not leak, the voltage at the positive input of the comparator will be less than or equal to the voltage at the reverse input, and the output of the comparator will output a low level, so that the SBC is in a dormant state and will not wake up the MCU. When the battery pack leaks, the resistance of the leakage sensor will decrease due to contact with the liquid, and the voltage of the second voltage divider will decrease, so that the voltage at the output of the sensing circuit will decrease, so that the voltage at the reverse input of the comparator is reduced to less than the voltage at the positive input, so that the output of the comparator will output a high level, which can wake up the SBC, so that the SBC reversely wakes up the MCU. After the MCU is woken up, it can collect the voltage at the output of the sensing circuit. If the voltage is less than the preset voltage, it can be determined that the final leakage detection result of the battery pack has leaked; if the voltage is greater than or equal to the preset voltage, it can be determined that the final leakage detection result of the battery pack has not leaked.

[0106] In some embodiments of the present application, the processor may also be configured to: A thermal runaway detection instruction is sent to the thermal runaway detection circuit so that the thermal runaway detection circuit performs thermal runaway detection on the battery pack to obtain a thermal runaway detection result.

[0107] Here, the thermal runaway detection circuit can be used to perform thermal runaway detection on the battery pack. The thermal runaway detection instruction can be used to trigger the thermal runaway detection circuit to perform thermal runaway detection on the battery pack. The thermal runaway detection result can indicate whether thermal runaway occurs in the battery pack.

[0108] Specifically, when the processor itself is in a working state, it can send a thermal runaway detection instruction to the thermal runaway detection circuit, so that the thermal runaway detection circuit performs thermal runaway detection on the battery pack to obtain a thermal runaway detection result.

[0109] In an embodiment of the present application, a processor may send a thermal runaway detection instruction to a thermal runaway detection circuit, triggering the thermal runaway detection circuit to perform thermal runaway detection on the battery pack, so that thermal runaway may be detected in time when the battery pack is in thermal runaway.

[0110] In some embodiments of the present application, the processor may also be configured to: When the final leakage detection result is that leakage has occurred and / or the thermal runaway detection result is that thermal runaway has occurred, an alarm message is output.

[0111] Here, the alarm information can be used to remind the user that the battery pack is leaking and / or experiencing thermal runaway.

[0112] The output form of the alarm information may include at least one of sound, text, image, and vibration.

[0113] Specifically, the processor can output an alarm message to alert the user when the battery pack leaks and / or thermal runaway occurs.

[0114] Exemplarily, if the leakage detection circuit is a leakage detection circuit in a vehicle, the processor can wake up the entire vehicle when the battery pack leaks and / or thermal runaway occurs, so that the vehicle's dashboard displays an alarm message, or the vehicle emits a sound to alarm, and the vehicle can also send an alarm message to the electronic device carried by the user so that the user can take corresponding measures.

[0115] In an embodiment of the present application, the processor can output an alarm message when the battery pack leaks and / or thermal runaway occurs, so as to remind the user to take timely measures to reduce safety risks.

[0116] Based on the same inventive concept, the present application also provides a battery device 1000, such as Figure 8 As shown, the battery device 1000 may include a battery 1100 and the aforementioned leakage detection circuit 1200 .

[0117] In the leakage detection circuit, if the processor is in the working state, the processor can directly collect the electrical parameters at the output end of the sensing circuit, and determine the final leakage detection result of the battery pack based on the electrical parameters; if the processor is in the dormant state, when the sensing circuit senses that the battery pack is leaking, the wake-up circuit can wake up the processor and put the processor into the working state, and then the processor can collect the electrical parameters at the output end of the sensing circuit, and determine the final leakage detection result of the battery pack based on the electrical parameters. In this way, accurate detection of whether the battery pack is leaking is achieved, and detection of whether the battery pack is leaking can be achieved regardless of whether the processor is dormant.

[0118] In some embodiments, the battery device may include a battery pack.

[0119] In some embodiments of the present application, the leakage detection circuit may include a leakage sensor. The leakage sensor may include a resistor. The resistor may be disposed in a groove located at the bottom of the inner side of the battery device.

[0120] Here, if the leakage sensor includes a resistor, a groove can be set at the bottom of the inner side of the battery device, and the resistor can be set in the groove; if the leakage sensor includes multiple resistors, multiple grooves can be set at the bottom of the inner side of the battery device, and a resistor can be set in each groove. Of course, multiple resistors can also be set in one groove.

[0121] Since liquid tends to flow to lower places, a groove is provided at the bottom of the inner side of the battery device in the embodiment of the present application. When the battery device leaks, the liquid can flow into the groove. The resistor is provided in the groove, so that the leakage of the battery device can be sensed more promptly.

[0122] Based on the same inventive concept, the present application also provides an electrical device. The electrical device may include a battery device, and the battery device is a battery device in any of the above embodiments. It can be understood that the electrical device has the beneficial effects of the battery device provided in the embodiments of the present application, that is, in the electrical device in the present application, if the processor is in a working state, the processor can directly collect the electrical parameters at the output end of the sensing circuit, and determine the final leakage detection result of the battery pack based on the electrical parameters; if the processor is in a dormant state, then when the sensing circuit senses that the battery pack is leaking, the wake-up circuit can wake up the processor and put the processor into a working state, and then the processor can collect the electrical parameters at the output end of the sensing circuit, and determine the final leakage detection result of the battery pack based on the electrical parameters. In this way, accurate detection of whether the battery pack is leaking is achieved, and detection of whether the battery pack is leaking can be achieved regardless of whether the processor is dormant.

[0123] In some embodiments, the electric device may include a vehicle. The battery may include an on-board storage battery or a power battery.

[0124] It should be noted that in the embodiments shown in the above figures, the resistor is represented by a single resistor, and the capacitor is represented by a single capacitor. In other embodiments, the resistor may be an integration of series, parallel or mixed resistors, and the capacitor may be an integration of series, parallel or mixed capacitors. The specific parameters of each device can be set according to actual needs, and this application does not limit this.

[0125] It should be understood that the specific structures of the circuits provided in the drawings of the embodiments of the present application are merely examples and are not intended to limit the present application. In addition, the above embodiments and features in the embodiments provided by the present application may be combined with each other if there is no contradiction.

[0126] It should be clear that each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. According to the embodiments described above in this application, these embodiments do not describe all the details in detail, nor do they limit the application to only the specific embodiments described. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the application, so that technicians in the relevant technical field can make good use of the application and the modified use based on the application. The application is only limited by the claims and their full scope and equivalents.

[0127] Those skilled in the art should understand that the above embodiments are exemplary rather than restrictive. Different technical features appearing in different embodiments can be combined to achieve beneficial effects. Based on the study of the drawings, the specification and the claims, those skilled in the art should be able to understand and implement other variations of the disclosed embodiments. In the claims, the term "comprising" does not exclude other structures; the quantity involves "one" but does not exclude multiple; the terms "first" and "second" are used to indicate names rather than to indicate any specific order. Any figure marks in the claims should not be understood as limiting the scope of protection. The appearance of certain technical features in different dependent claims does not mean that these technical features cannot be combined to achieve beneficial effects.

[0128] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A liquid leakage detection circuit, characterized in that: include: a sensing circuit, wherein an output end of the sensing circuit is electrically connected to an input end of the wake-up circuit and a first input end of the processor, respectively, and is used to sense whether the battery pack is leaking; a wake-up circuit, wherein an output end of the wake-up circuit is electrically connected to the second input end of the processor, and is used to wake up the processor when the processor is in a dormant state and the sensing circuit senses that the battery pack is leaking; The processor is used to collect electrical parameters of the output end of the sensing circuit, and determine a final leakage detection result of the battery pack based on the electrical parameters; The induction circuit comprises: a first voltage divider, wherein a first end of the first voltage divider is electrically connected to a first power supply, and a second end of the first voltage divider is electrically connected to an input end of the wake-up circuit, a first input end of the processor, and a first end of a second voltage divider respectively; The second voltage divider, a second end of the second voltage divider is grounded, and is used to output a first electrical parameter when leakage occurs in the battery pack, and output a second electrical parameter when no leakage occurs in the battery pack, and the first electrical parameter is different from the second electrical parameter.

2. The liquid leakage detection circuit according to claim 1, characterized in that: The second voltage divider comprises: A liquid leakage sensor, wherein a first end of the liquid leakage sensor is electrically connected to an input end of the wake-up circuit, a first input end of the processor, and a second end of the first voltage divider, respectively, and a second end of the liquid leakage sensor is grounded.

3. The liquid leakage detection circuit according to claim 2, characterized in that: The second voltage divider further comprises: A voltage divider element, wherein the first end of the voltage divider element is electrically connected to the first end of the liquid leakage sensor, the input end of the wake-up circuit, the first input end of the processor and the second end of the first voltage divider, and the second end of the voltage divider element is electrically connected to the second end of the liquid leakage sensor.

4. The liquid leakage detection circuit according to claim 2 or 3, characterized in that: The liquid leakage sensor includes a plurality of resistors.

5. The liquid leakage detection circuit according to claim 4, characterized in that: The multiple resistors are connected in parallel.

6. The liquid leakage detection circuit according to claim 1, characterized in that: The wake-up circuit comprises: a comparator, wherein a first input terminal of the comparator is electrically connected to the second terminal of the first voltage divider and the first terminal of the second voltage divider respectively, a second input terminal of the comparator is electrically connected to a second power supply, an output terminal of the comparator is electrically connected to an input terminal of the wake-up device, and is configured to output a third electrical parameter when the first input terminal of the comparator receives the first electrical parameter; The wake-up device, wherein the output end of the wake-up device is electrically connected to the second input end of the processor, is used to wake up the processor when the processor is in a sleep state and the wake-up device receives the third electrical parameter.

7. The liquid leakage detection circuit according to claim 6, characterized in that: The wake-up circuit also includes: a third voltage divider, wherein a first end of the third voltage divider is electrically connected to the second power supply, and a second end of the third voltage divider is electrically connected to the second input end of the comparator and the first end of a fourth voltage divider respectively; The fourth voltage divider, a second end of the fourth voltage divider is grounded.

8. The liquid leakage detection circuit according to claim 1, characterized in that: The electrical parameter includes a voltage, and the processor is configured to: When the voltage is less than a preset voltage, determining that a final leakage detection result of the battery pack is leakage; When the voltage is greater than or equal to the preset voltage, it is determined that a final leakage detection result of the battery pack is that no leakage occurs.

9. The liquid leakage detection circuit according to claim 1, characterized in that: The processor is further configured to: A thermal runaway detection instruction is sent to the thermal runaway detection circuit, so that the thermal runaway detection circuit performs thermal runaway detection on the battery pack to obtain a thermal runaway detection result.

10. The liquid leakage detection circuit according to claim 9, characterized in that: The processor is further configured to: When the final liquid leakage detection result indicates that liquid leakage has occurred and / or the thermal runaway detection result indicates that thermal runaway has occurred, an alarm message is output.

11. A battery device, characterized in that: include: A battery and a leakage detection circuit as claimed in any one of claims 1 to 10.

12. The battery device according to claim 11, characterized in that: The leakage detection circuit includes a leakage sensor, and the leakage sensor includes a resistor. The resistor is arranged in a groove located at the bottom of the inner side of the battery device.

13. An electrical device, characterized in that: include: A battery device as claimed in claim 11 or 12.

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