Battery liquid leakage detection system, method and device and computer program product

Abstract

The invention belongs to the technical field of new energy batteries, and provides a battery liquid leakage detection system, method and device and a storage medium. A battery liquid cooling system comprises an internal liquid cooling system located in a shell of a battery pack and an external liquid cooling system located outside the shell of the battery pack; a liquid leakage sensor is arranged in a shell of the battery pack; the external liquid cooling system is communicated with a liquid cooling kettle, and the liquid cooling kettle is provided with a liquid level sensor; the liquid leakage sensor is used for sensing liquid leakage data in the shell of the battery pack under the condition that leaked liquid in the shell of the battery pack flows into the liquid leakage sensor; the liquid level sensor collects kettle liquid level change data of the external liquid cooling system. The battery management system can judge whether liquid leakage exists in the battery pack or not based on the liquid leakage sensor arranged in the battery shell, and judge whether liquid leakage exists in the external liquid cooling system or not based on the kettle liquid level change data, so that the liquid leakage condition of the battery liquid cooling system can be accurately judged.

Description

Technical Field

[0001] This application belongs to the field of new energy battery technology, and in particular relates to battery liquid leakage detection systems, methods, devices and computer program products. Background Technology

[0002] New energy batteries generate a significant amount of heat during operation. If this heat cannot be dissipated in time, it can lead to overheating, affecting battery performance and lifespan. Current technologies often employ cooling systems to lower battery temperatures. These systems work by injecting coolant into liquid level pipes within the battery pack. As the coolant flows through the battery modules, it absorbs the heat generated by the modules, thus reducing their temperature.

[0003] However, power batteries can have liquid leakage problems, such as coolant leakage caused by the failure of the power battery's liquid cooling pipeline system or leakage of other liquids (such as electrolyte) in the power battery pack. Currently, there is no complete detection and judgment method for battery liquid leakage. Summary of the Invention

[0004] This invention provides a battery liquid leakage detection system, method, device, and computer program product, aiming to solve the technical problem that there is currently no complete method to detect liquid leakage in new energy batteries.

[0005] In a first aspect, embodiments of this application provide a battery liquid leakage detection system, the detection system being used to detect a battery liquid cooling system; the battery liquid cooling system includes an internal liquid cooling system located inside the housing of the battery pack, and an external liquid cooling system located outside the housing of the battery pack; a leakage sensor is disposed inside the housing of the battery pack; the external liquid cooling system is connected to a liquid cooling water tank, and the liquid cooling water tank is equipped with a liquid level sensor;

[0006] The leakage sensor is configured to sense liquid leakage data inside the battery pack housing when leaked liquid flows into the leakage sensor, and transmit the liquid leakage data to the battery management system.

[0007] The liquid level sensor is configured to collect data on changes in the liquid level of the kettle in the external liquid cooling system and transmit the data to the battery management system.

[0008] In this embodiment, a leakage sensor installed inside the battery casing can be used to determine whether there is a liquid leak inside the battery pack, and the liquid level change data of the water tank can be used to determine whether there is a liquid leak in the external liquid cooling system outside the battery casing, thereby accurately determining the liquid leakage situation of the battery liquid cooling system.

[0009] In some embodiments, the detection system further includes a flow resistance sensor, which is disposed at the junction of the pipelines of the external liquid cooling system and the internal liquid cooling system; the flow resistance sensor is configured to collect flow resistance change data of the battery liquid cooling system;

[0010] The battery management system is used to determine the type of liquid leakage inside the battery pack casing based on the flow resistance change data and the liquid leakage data.

[0011] In this embodiment of the application, when there is liquid leakage inside the battery pack, the type of liquid leakage inside the battery pack casing can be determined based on the flow resistance change data of the battery liquid cooling system.

[0012] In some embodiments, the leakage sensor further includes a liquid composition detection unit configured to detect the composition of leaked liquid inside the housing of the battery pack;

[0013] The battery management system is also used to determine the type of liquid leakage inside the battery pack housing based on the composition of the leaking liquid.

[0014] In this embodiment of the application, the leakage sensor may be equipped with a liquid composition detection unit, which can directly detect the composition of the leaking liquid inside the battery pack housing, and thus determine the type of liquid leakage inside the battery pack housing.

[0015] In some embodiments, the leakage sensor is located at the bottom of the battery pack housing.

[0016] In this embodiment, since the leakage sensor is installed at the bottom of the battery pack housing, when liquid leakage occurs inside the battery pack housing, the leaked liquid will settle at the bottom of the housing, and even a slight liquid leakage inside the battery pack housing can be detected in time.

[0017] In some embodiments, the detection system further includes a battery insulation sensor configured to acquire insulation data of the battery, the battery insulation sensor being connected to the electrodes of the main battery of the battery pack;

[0018] The battery management system is also used to determine the degree of liquid leakage inside the battery pack casing based on the liquid leakage data and the insulation data.

[0019] In this embodiment of the application, by collecting the insulation data of the battery from the battery insulation sensor, it is possible to determine whether the liquid leakage inside the battery pack casing has come into contact with the high-voltage positive or negative terminal of the battery, thereby accurately and timely determining the severity of the liquid leakage inside the battery pack casing.

[0020] In some embodiments, the external liquid cooling system further includes an external management component;

[0021] The battery management system is also used to control the opening or closing of the external management component, and to determine the location of liquid leakage in the external liquid cooling system based on the opening or closing status of the external management component.

[0022] In this embodiment of the application, if it is determined that there is no liquid leakage inside the battery pack casing, the operator can determine the specific location of the leaking liquid in the external liquid cooling system by controlling the opening or closing of the external management component provided on the external liquid cooling system.

[0023] Secondly, this application also proposes a battery liquid leakage detection method, which is applied to the battery liquid leakage detection system described in the first aspect above, the method comprising:

[0024] The liquid leakage data inside the battery pack housing is acquired by the leakage sensor, wherein the liquid leakage data is obtained when the leaking liquid inside the battery pack housing flows into the leakage sensor;

[0025] Acquire the liquid level change data of the external liquid cooling system of the battery liquid cooling system collected by the liquid level sensor;

[0026] The liquid leakage situation of the battery liquid cooling system is determined based on the liquid leakage data and the water level change data of the kettle.

[0027] In this embodiment, the battery management system can determine whether there is liquid leakage inside the battery pack based on the leakage sensor installed inside the battery casing, and determine whether there is liquid leakage in the external liquid cooling system outside the battery casing based on the water level change data. That is, based on two different types of sensors, the liquid leakage of the battery liquid cooling system can be comprehensively detected, and the liquid leakage of the battery can be accurately determined whether the leakage is inside or outside the battery pack.

[0028] In some embodiments, the detection method further includes:

[0029] Obtain the type of liquid leakage inside the casing of the battery pack;

[0030] The liquid leakage status of the internal liquid cooling system is determined based on the type of liquid leakage inside the battery pack housing and the liquid leakage data.

[0031] In this embodiment, the battery management system can effectively determine the liquid leakage status of the internal liquid cooling system based on the type of liquid leakage inside the battery pack casing and the liquid leakage data.

[0032] In some embodiments, obtaining the type of liquid leakage inside the housing of the battery pack includes:

[0033] Acquire the flow resistance change data of the battery liquid cooling system collected by the flow resistance sensor;

[0034] The type of liquid leakage inside the battery pack casing is determined based on the flow resistance change data and the liquid leakage data.

[0035] In this embodiment of the application, when the battery management system determines that there is a liquid leak inside the battery pack, it can determine the type of liquid leak inside the battery pack casing based on the flow resistance change data of the battery liquid cooling system.

[0036] In some embodiments, obtaining the type of liquid leakage inside the housing of the battery pack includes:

[0037] The composition of the leaked liquid inside the casing of the battery pack is obtained, and the composition of the leaked liquid is collected by the liquid composition detection unit of the leak sensor;

[0038] The type of liquid leak inside the battery pack housing is determined based on the composition of the leaking liquid.

[0039] In this embodiment of the application, the leakage sensor may be equipped with a liquid composition detection unit, which can directly detect the composition of the leaking liquid inside the battery pack housing, and thus determine the type of liquid leakage inside the battery pack housing.

[0040] In some embodiments, the method further includes:

[0041] Obtain the insulation data of the battery collected by the battery insulation sensor;

[0042] The degree of liquid leakage inside the battery pack casing is determined based on the liquid leakage data and the insulation data.

[0043] In this embodiment of the application, the battery management system can determine whether the liquid leakage inside the battery pack casing has come into contact with the battery by acquiring the battery insulation data from the battery insulation sensor, thereby accurately and timely determining the severity of the liquid leakage inside the battery pack casing.

[0044] In some embodiments, determining the degree of liquid leakage inside the battery pack housing based on the liquid leakage data and the insulation data includes:

[0045] If the liquid leakage data exists and the insulation data indicates a normal insulation state, then the degree of liquid leakage inside the battery pack casing is determined to be the first leakage level; or,

[0046] If the liquid leakage data exists and the insulation data characterizes an insulation fault state, then the degree of liquid leakage inside the battery pack casing is determined to be the second leakage degree.

[0047] In this embodiment, the battery management system can accurately and promptly determine whether the liquid leakage inside the battery pack casing is a minor leak or a serious leak.

[0048] In some embodiments, the method further includes:

[0049] In response to control commands to the external management components of the external liquid cooling system, the external management components are controlled to be in an on or off state.

[0050] The location of liquid leakage in the external liquid cooling system is determined based on the open or closed state.

[0051] In this embodiment of the application, if it is determined that there is no liquid leakage inside the battery pack casing, the operator can determine the specific location of the leaking liquid in the external liquid cooling system by controlling the opening or closing of the external management component provided on the external liquid cooling system.

[0052] In some embodiments, the method further includes:

[0053] A notification is provided regarding the liquid leak.

[0054] In this embodiment, the battery management system can promptly issue alerts regarding battery leakage, reminding users to take appropriate protective measures.

[0055] In some embodiments, the method further includes:

[0056] The fault level of the battery liquid cooling system is determined based on the liquid leakage situation, wherein the liquid leakage situation is determined based on the liquid leakage data, the liquid level change data of the water tank, the type of liquid leakage inside the battery pack housing, the insulation data of the battery, and the on or off status of the external management components.

[0057] The fault level is indicated.

[0058] In this embodiment, different liquid leakage conditions are obtained based on different sensor detection results, and different liquid leakage conditions correspond to different fault levels. When a liquid leakage occurs, the fault level will be indicated, so that the user can intuitively understand the current fault level of the battery liquid cooling system.

[0059] Thirdly, this application also proposes a battery liquid leakage detection device, the device comprising:

[0060] The acquisition unit is used to acquire liquid leakage data inside the battery pack housing collected by the leakage sensor. The liquid leakage data is obtained when the leaking liquid inside the battery pack housing flows into the leakage sensor.

[0061] The acquisition unit is also used to acquire the liquid level change data of the external liquid cooling system of the battery liquid cooling system collected by the liquid level sensor.

[0062] The processing unit is used to determine the liquid leakage status of the battery liquid cooling system based on the liquid leakage data and the water level change data of the kettle. The battery liquid cooling system includes an internal liquid cooling system located inside the battery pack housing and an external liquid cooling system located outside the battery pack housing.

[0063] In some embodiments, the apparatus further includes:

[0064] The control unit is used to respond to control commands to the external management components of the external liquid cooling system and control the external management components to be in an on or off state.

[0065] The processing unit is also used to determine the location of liquid leakage in the external liquid cooling system based on the open state or the closed state.

[0066] Fourthly, this application also proposes a computer program product, including a computer program that, when run, causes the battery liquid leakage detection method described in the first aspect above to be executed.

[0067] It should be noted that the beneficial effects of the third and fourth aspects mentioned above should be referred to the beneficial effects of the first and second aspects, and will not be elaborated upon here. Attached Figure Description

[0068] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0069] Figure 1 This is a schematic diagram of the battery liquid leakage detection system provided in the embodiments of this application;

[0070] Figure 2 This is a schematic flowchart of a battery liquid leakage detection method provided in an embodiment of this application;

[0071] Figure 3 This is a schematic flowchart of another embodiment of the battery liquid leakage detection method provided in this application;

[0072] Figure 4 This is a schematic diagram of another embodiment of the battery liquid leakage detection system provided in this application;

[0073] Figure 5 This is a schematic flowchart of another embodiment of the battery liquid leakage detection method provided in this application;

[0074] Figure 6 A schematic diagram of an embodiment of a table of liquid leakage information obtained by combining different sensor detection results provided in this application;

[0075] Figure 7 This is a schematic flowchart of another embodiment of the battery liquid leakage detection method provided in this application;

[0076] Figure 8 A schematic diagram of an embodiment of a table showing the liquid leakage status obtained by combining different sensor detection results with the status of external management components provided in this application;

[0077] Figure 9 This is a structural block diagram of an embodiment of the battery liquid leakage detection device provided in this application.

[0078] Icon labels:

[0079] Battery pack housing - 1, internal liquid cooling system - 2, leakage sensor - 3, (battery pack inlet) flow resistance sensor - 4, water pump - 5, heat exchanger - 6, liquid cooling water tank - 7, liquid level sensor - 8, liquid cooling piping - 9, electronic valve - 10, (battery pack outlet) flow resistance sensor - 11, external liquid cooling system - 12. Detailed Implementation

[0080] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0081] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0082] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0083] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), unless otherwise expressly and specifically defined.

[0084] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0085] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0086] The inventors of this application have noted that failure of the liquid cooling pipeline system in electric vehicles can cause electrolyte leakage, such as coolant leakage, leakage of other liquids (such as electrolyte) within the power battery pack, or external liquid ingress due to battery pack airtightness failure. Although some detection methods exist in the prior art to detect pipeline leakage problems in power batteries, they cannot achieve complete and comprehensive detection and accurate judgment. For example, the prior art cannot accurately determine the location of liquid leakage in new energy batteries (whether it is inside or outside the battery pack); it cannot determine whether it is coolant leakage, electrolyte leakage, or external liquid ingress due to battery pack airtightness failure; and it cannot determine whether the liquid leakage in new energy batteries is a serious leakage or a minor leakage.

[0087] To address the aforementioned technical problems, this application proposes a technical solution for a battery liquid leakage detection system, method, device, and computer program product, which can comprehensively detect and accurately determine the liquid leakage situation of new energy batteries.

[0088] To illustrate the technical solutions proposed in the embodiments of this application, specific embodiments are described below.

[0089] Please see Figure 1 , Figure 1This is a schematic diagram of a battery liquid leakage detection system provided in this application. The battery liquid leakage detection system of this application embodiment is used to detect the battery liquid cooling system. The battery liquid cooling system can be a liquid cooling system for a power battery or a liquid cooling system for an energy storage battery. The battery liquid cooling system includes an internal liquid cooling system 2 located inside the housing 1 of the battery pack and an external liquid cooling system 12 located outside the housing 1 of the battery pack. A leakage sensor 3 is arranged inside the housing 1 of the battery pack. The external liquid cooling system 12 is connected to a liquid cooling water tank 7, and the liquid cooling water tank 7 is equipped with a liquid level sensor 8.

[0090] The leakage sensor 3 is configured to sense liquid leakage data inside the housing 1 of the battery pack when leaking liquid flows into the leakage sensor 3, and transmit the liquid leakage data to the battery management system (BMS).

[0091] The liquid level sensor 8 is configured to collect data on changes in the liquid level of the water tank in the external liquid cooling system 12 and transmit the data to the battery management system (BMS).

[0092] Accordingly, the battery liquid leakage detection method provided in this application is executed by the battery management system (BMS), and the method includes:

[0093] Step S10: Obtain liquid leakage data inside the battery pack housing collected by the leakage sensor. The liquid leakage data is obtained when leaking liquid inside the battery pack housing flows into the leakage sensor.

[0094] Specifically, in this embodiment, the leak sensor can be installed at the bottom of the battery pack housing. Therefore, when liquid leaks inside the battery pack housing, the leaked liquid will settle at the bottom of the housing. If there is a liquid leak inside the battery pack housing, the leak sensor can detect it in time. The leak sensor has two states: 0 - no leak and 1 - leak.

[0095] In its implementation, the leakage sensor 3 has a positive and a negative electrode inside. When the battery is normal and not leaking, the leakage sensor 3 will not react (no leakage state). The leakage sensor 3 is located in the corner of the bottom of the battery pack casing. So when liquid leaks inside the battery pack casing 1, the leaked liquid will settle at the bottom of the casing and then flow into the leakage sensor 3. The leaked liquid will short-circuit the positive and negative electrodes inside the leakage sensor 3, and the resistance of the leakage sensor will change, thus detecting the liquid leak inside the casing in time (leakage state).

[0096] Step S20: Obtain the liquid level change data of the external liquid cooling system of the battery liquid cooling system collected by the liquid level sensor.

[0097] Specifically, the liquid level sensor collects the liquid level of the liquid cooler 7 of the battery liquid cooling system in real time at a fixed frequency. The liquid level sensor includes three states: 0 - normal liquid level, 1 - liquid level decreased, and 2 - liquid level increased. In this embodiment, states 0 and 1 are used. If the liquid level change data shows that the liquid level of the liquid cooler has decreased, it indicates that there is a leakage in the external liquid cooling system.

[0098] Step S30: Determine the liquid leakage status of the battery liquid cooling system based on liquid leakage data and water level change data.

[0099] This application embodiment uses a leakage sensor installed inside the battery casing to determine whether there is a liquid leak inside the battery pack, and uses water level change data to determine whether there is a liquid leak in the external liquid cooling system outside the battery casing. That is, based on two different types of sensors, the liquid leakage of the battery liquid cooling system can be comprehensively detected, and the liquid leakage of the battery can be accurately determined whether the leakage is inside or outside the battery pack.

[0100] Further, refer to Figure 3 The battery liquid leakage detection method in this application embodiment further includes:

[0101] Step S31: Obtain the type of liquid leakage inside the battery pack casing;

[0102] Step S32: Determine the liquid leakage status of the internal liquid cooling system based on the type of liquid leakage inside the battery pack housing and the liquid leakage data.

[0103] It is understood that the types of liquid leakage inside the housing may include leakage of coolant inside the battery pack, as well as leakage of other liquids inside the battery pack.

[0104] Specifically, the BMS in this application embodiment can obtain the type of liquid leakage inside the battery pack casing in two ways:

[0105] The first method: The detection system also includes a flow resistance sensor, which is installed at the intersection of the pipes of the external liquid cooling system 12 and the internal liquid cooling system 2; the flow resistance sensor is configured to collect the flow resistance change data of the battery liquid cooling system in real time at a fixed frequency; in this way, the battery management system (BMS) will determine the type of liquid leakage inside the battery pack casing based on the flow resistance change data and the liquid leakage data.

[0106] In specific applications, such as Figure 4As shown, the flow resistance sensor 4 can be arranged at the battery pack inlet of the external liquid cooling system 12 (i.e., flow resistance sensor 4) and at the battery pack outlet of the external liquid cooling system 12 (i.e., flow resistance sensor 11). The flow resistance sensor has two states: 0 - constant flow resistance and 1 - changing flow resistance. When the coolant temperature and water pump flow rate are constant, the flow resistance is constant when the difference between the flow resistance sensor result at the outlet and the flow resistance sensor result at the inlet is constant within the calibration range (e.g., the horizontal axis is time, the vertical axis is flow resistance, and the slope is 0). The flow resistance changes when it exceeds the calibration range. A change in flow resistance (result 1) indicates that the liquid leakage inside the battery pack casing is a leak of coolant inside the battery pack. A constant flow resistance (result 2) indicates that the liquid leakage inside the battery pack casing is a leak of other liquids inside the battery pack.

[0107] The second method: The leakage sensor 3 also includes a liquid composition detection unit, which is configured to detect the composition of the leaked liquid inside the housing 1 of the battery pack. The battery management system (BMS) will then determine the type of liquid leakage inside the housing 1 of the battery pack based on the composition of the leaked liquid.

[0108] The leakage sensor can be equipped with a liquid composition detection unit, which can directly detect the composition of the leaking liquid inside the battery pack housing, thereby determining the type of liquid leakage inside the battery pack housing. If the detected liquid composition is coolant, it indicates that the coolant inside the battery pack is leaking; if the detected liquid composition is other liquid, it indicates that other liquids (such as electrolyte) inside the battery pack are leaking.

[0109] In flow resistance sensors, not limited to... Figure 4 In that case, the flow resistance sensor is installed at the liquid outlet and liquid inlet outside the battery pack. In other embodiments, the flow resistance sensor can also be installed at the liquid inlet and outlet inside the battery pack.

[0110] Furthermore, in some embodiments, the leakage sensor is located at a corner of the bottom of the battery pack housing. It is understood that the battery housing is typically limited, so the leakage sensor is placed at the lowest point (bottom) of the housing, and one leakage sensor 3 is arranged at each corner of the housing (e.g., Figure 4 As shown, when liquid leaks inside the battery pack housing 1, the leaked liquid will settle at the bottom of the housing, and even a slight liquid leak inside the battery pack housing can be detected in time.

[0111] Furthermore, in some other embodiments, the detection system further includes a battery insulation sensor configured to collect insulation data of the battery, the battery insulation sensor being connected to the electrodes of the main battery of the battery pack;

[0112] Accordingly, refer to Figure 5 The Battery Management System (BMS) is also used to perform the following method steps:

[0113] Step S301: Obtain the insulation data of the battery collected by the battery insulation sensor;

[0114] Step S302: Determine the degree of liquid leakage inside the battery pack casing based on liquid leakage data and insulation data.

[0115] This application embodiment can determine whether liquid leakage inside the battery pack casing has come into contact with the high-voltage positive or negative terminal of the battery by collecting insulation data from the battery insulation sensor, thereby determining the severity of liquid leakage inside the battery pack casing.

[0116] Specifically, the battery insulation resistance sensor includes two states: 0 - normal insulation state and 1 - insulation fault state. If, after BMS analysis, the liquid leakage data is found to exist and the insulation data indicates a normal insulation state, then the liquid leakage level inside the battery pack casing is determined to be the first leakage level, indicating that the liquid leakage is not serious. If, after BMS analysis, the liquid leakage data is found to exist and the insulation data indicates an insulation fault state, then the liquid leakage level inside the battery pack casing is determined to be the second leakage level, indicating that the liquid leakage is serious.

[0117] In a specific implementation, the battery insulation resistance sensor in this embodiment is connected to the battery's positive terminal, the battery's negative terminal, and the battery pack casing, and is connected to the battery management system. The battery management system detects and judges the battery insulation status by measuring the battery's positive terminal against the casing and the battery's negative terminal against the casing. If the battery insulation data collected by the battery insulation sensor indicates a normal insulation state, it means that the coolant in the battery pack has a slight leak and has not come into contact with the battery's high-voltage positive / negative terminals, indicating that the liquid leak is not serious. If the coolant in the battery pack leaks and comes into contact with the battery's high-voltage positive / negative terminals, it indicates that the liquid leak is relatively serious.

[0118] Furthermore, to further illustrate the different liquid leakage situations obtained from the detection results of different sensors (leakage sensor, flow resistance sensor, battery insulation resistance sensor, and liquid level sensor) in the embodiments of this application, the embodiments of this application combine the detection results of various sensors (with the water pump and electronic valve closed), and then... Figure 6 The system displays different types or fault levels of liquid leaks based on different combinations. The BMS processing unit then processes the sensor status according to... Figure 6The display combines the battery insulation sensor, leakage sensor, and liquid level sensor in sequence into a 3-bit binary number. This 3-bit binary number is converted to decimal 0-7, representing 8 fault levels. Higher values ​​indicate higher fault levels and more severe failures. In the event of a liquid leak, the system will display the leakage status and fault level, allowing the user to intuitively understand the current fault level of the battery liquid cooling system. These prompts can be provided through various means, including but not limited to voice prompts and a description of the leak on the vehicle's central control screen.

[0119] Furthermore, in some other embodiments, the external liquid cooling system of the detection system in the application embodiments further includes an external management component, corresponding to... Figure 7 The detection method in the application embodiment further includes:

[0120] Step S41: Respond to the control command for the external management component of the external liquid cooling system, and control the external management component to be in an on or off state;

[0121] Step S42: Determine the location of liquid leakage in the external liquid cooling system based on the open or closed state.

[0122] Understandably, if it is determined that there is no liquid leakage inside the battery pack housing 1, the operator can determine the specific location of the leaking liquid in the external liquid cooling system by controlling the opening or closing of the external management components on the external liquid cooling system 12.

[0123] In specific implementations, such as Figure 4 As shown, the external management component may include at least a water pump 5 and an electronic valve 10. The water pump 5 has three states: 0-off, 1-constant flow operation, and 2-variable flow operation. This embodiment only uses states 0 and 1. The electronic valve 10 has two states: 0-off and 1-on. This embodiment can determine the specific location of the leaking liquid in the external liquid cooling system by controlling the simultaneous opening and closing of the water pump 5 and the electronic valve 10.

[0124] Furthermore, to further illustrate the different liquid leakage situations obtained from the detection results of external management components in the open state and different sensors (leakage sensor, flow resistance sensor, battery insulation resistance sensor, and liquid level sensor) in the embodiments of this application, the embodiments of this application combine the detection results of various sensors with the open state of the external management components (when the water pump and electronic valve are open), such as... Figure 8As shown, the leak point and failure type are determined by combining the status of water pump 5, electronic valve 10, and flow resistance sensor with the fault level. The water pump has three states: 0-off, 1-constant flow operation, and 2-variable flow operation. This embodiment only uses states 0 and 1. The electronic valve has two states: 0-off and 1-open. This embodiment can require the water pump and electronic valve to open and close simultaneously.

[0125] In addition, the BMS processing unit stores fault and leak data in the data storage device. If a fault occurs (fault 1 to 7), the processing unit will transmit the fault to the alarm display device and the control unit. The alarm display device will notify the user of the fault occurrence and handling measures. The control unit will control the electronic valve, water pump, and high and low voltage electrical components to take corresponding actions within a fixed time according to the fault threshold level.

[0126] Furthermore, embodiments of this application also propose a battery liquid leakage detection device, referring to... Figure 9 The device mainly includes a data acquisition unit 01 and a processing unit 02:

[0127] The acquisition unit 01 is used to acquire liquid leakage data inside the battery pack housing collected by the leakage sensor. The liquid leakage data is obtained when the leaking liquid inside the battery pack housing flows into the leakage sensor.

[0128] The acquisition unit 01 is also used to acquire the liquid level change data of the external liquid cooling system of the battery liquid cooling system collected by the liquid level sensor;

[0129] Processing unit 02 is used to determine the liquid leakage situation of the battery liquid cooling system based on liquid leakage data and water level change data. The battery liquid cooling system includes an internal liquid cooling system located inside the battery pack housing and an external liquid cooling system located outside the battery pack housing.

[0130] The battery liquid leakage detection device of this application embodiment can be understood as a battery management system with battery liquid leakage detection function. The detection system's liquid level sensor, leakage sensor, battery insulation sensor, and flow resistance sensor (optional) transmit the collected data to the processing unit. The processing unit of the battery liquid leakage detection device can determine the liquid leakage situation of the battery liquid cooling system based on the liquid leakage data and the water tank liquid level change data.

[0131] Furthermore, the device also includes a control unit 03:

[0132] Control unit 03 is used to respond to control commands to the external management components of the external liquid cooling system and control the external management components to be in an on or off state.

[0133] Processing unit 02 is also used to determine the location of liquid leakage in the external liquid cooling system based on the open state or the closed state.

[0134] Control unit 03 controls the electronic valve, water pump switch and water pump speed (controlling flow rate through speed), and high / low voltage electrical component switches. It also feeds back the status of the electronic valve, water pump, and high / low voltage electrical components to processing unit 02. Processing unit 02 processes the data collected by each sensor and outputs and stores the data according to its status.

[0135] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0136] This application also proposes a computer program product, including a computer program, which, when run, causes the battery liquid leakage detection method of the above embodiments to be executed.

[0137] It should be noted that if the integrated units / modules / systems described above are implemented as software functional units and sold or used as independent products, they can be stored in a computer program product. Based on this understanding, all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a computer program product, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include at least: any entity or device capable of carrying computer program code to an electronic device, recording media, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media. Examples include USB flash drives, portable hard drives, magnetic disks, or optical disks. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electrical carrier signals or telecommunication signals.

[0138] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0139] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A battery liquid leakage detection system, characterized by, The detection system is used for detecting a battery liquid cooling system; the battery liquid cooling system comprises an internal liquid cooling system located inside a shell of a battery pack and an external liquid cooling system located outside the shell of the battery pack; a liquid leakage sensor is arranged in the shell of the battery pack; the external liquid cooling system is in communication with a liquid cooling kettle, and the liquid cooling kettle is provided with a liquid level sensor; The liquid leakage sensor is configured to sense liquid leakage data in the shell of the battery pack and transmit the liquid leakage data to a battery management system when leakage liquid in the shell of the battery pack flows into the liquid leakage sensor; The liquid level sensor is configured to collect kettle liquid level change data of the external liquid cooling system and transmit the kettle liquid level change data to the battery management system.

2. The detection system of claim 1, wherein, The detection system further comprises a flow resistance sensor arranged at a pipe intersection position of the external liquid cooling system and the internal liquid cooling system; the flow resistance sensor is configured to collect flow resistance change data of the battery liquid cooling system; The battery management system is used for judging a liquid leakage type in the shell of the battery pack according to the flow resistance change data and the liquid leakage data.

3. The detection system of claim 1, wherein, The liquid leakage sensor further comprises a liquid component detection unit configured to detect a component of the leakage liquid in the shell of the battery pack; The battery management system is further used for determining the liquid leakage type in the shell of the battery pack based on the component of the leakage liquid.

4. The detection system according to any one of claims 1 to 3, characterized in that The liquid leakage sensor is arranged at a bottom of a box body of the battery pack.

5. The detection system of claim 4, wherein, The detection system further comprises a battery insulation sensor configured to collect insulation data of a battery, and the battery insulation sensor is connected with an electrode of a main battery of the battery pack; The battery management system is further used for judging a liquid leakage degree in the shell of the battery pack according to the liquid leakage data and the insulation data.

6. The detection system of claim 5, wherein, The external liquid cooling system further comprises an external management component; The battery management system is further used for controlling opening or closing of the external management component and judging a liquid leakage position of the external liquid cooling system according to an opening state or a closing state of the external management component.

7. A battery liquid leakage detection method characterized by, The method is applied to the battery liquid leakage detection system according to any one of claims 1 to 6, and the method comprises: obtaining liquid leakage data in the shell of the battery pack collected by the liquid leakage sensor, the liquid leakage data being obtained when leakage liquid in the shell of the battery pack flows into the liquid leakage sensor; obtaining kettle liquid level change data of the external liquid cooling system of the battery liquid cooling system collected by the liquid level sensor; determining a liquid leakage condition of the battery liquid cooling system based on the liquid leakage data and the kettle liquid level change data.

8. The detection method of claim 7, wherein, The detection method further comprises: obtaining a liquid leakage type in the shell of the battery pack; determining a liquid leakage condition of the internal liquid cooling system based on the liquid leakage type in the shell of the battery pack and the liquid leakage data.

9. The detection method of claim 8, wherein, The obtaining of the liquid leakage type in the shell of the battery pack comprises: Obtaining flow resistance change data of the battery liquid cooling system collected by a flow resistance sensor; Determining a liquid leakage type inside the battery pack shell according to the flow resistance change data and the liquid leakage data.

10. The detection method as described in claim 8, characterized in that, The method further comprises: Obtaining the composition of the leakage liquid inside the battery pack shell, which is collected by the liquid composition detection unit of the leakage sensor; Determining the liquid leakage type inside the battery pack shell based on the composition of the leakage liquid.

11. The detection method according to any one of claims 7 to 10, wherein The method further comprises: Obtaining insulation data of the battery collected by the battery insulation sensor; Determining a liquid leakage degree inside the battery pack shell according to the liquid leakage data and the insulation data.

12. The detection method of claim 11, wherein, The method further comprises: If the liquid leakage data exists and the insulation data represents a normal insulation state, determining that the liquid leakage degree inside the battery pack shell is a first leakage degree; or If the liquid leakage data exists and the insulation data represents an insulation failure state, determining that the liquid leakage degree inside the battery pack shell is a second leakage degree.

13. The assay method according to any one of claims 7 to 12, wherein The method further comprises: In response to a control instruction of an external management component of the external liquid cooling system, controlling the external management component to be in an open state or a closed state; Determining a liquid leakage position of the external liquid cooling system based on the open state or the closed state.

14. The assay method according to any one of claims 7 to 12, wherein The method further comprises: Prompting the liquid leakage situation.

15. The assay method according to any one of claims 7 to 14, wherein The method further comprises: Determining a fault level of the battery liquid cooling system according to the liquid leakage situation, wherein the liquid leakage situation is determined based on the liquid leakage data, the kettle liquid level change data, the liquid leakage type inside the battery pack shell, the insulation data of the battery, and the open state or the closed state of the external management component; Prompting the fault level.

16. A battery liquid leakage detection device characterized by comprising: The device comprises: A collection unit configured to obtain liquid leakage data inside a battery pack shell collected by a leakage sensor, the liquid leakage data being obtained when leakage liquid inside the battery pack shell flows into the leakage sensor; The collection unit is further configured to obtain kettle liquid level change data of an external liquid cooling system of a battery liquid cooling system collected by a liquid level sensor; A processing unit configured to determine a liquid leakage situation of a battery liquid cooling system based on the liquid leakage data and the kettle liquid level change data, the battery liquid cooling system comprising an internal liquid cooling system located inside a battery pack shell and the external liquid cooling system located outside the battery pack shell.

17. The battery liquid leak detection apparatus of claim 16, wherein, The device further comprises: A control unit configured to control an external management component of the external liquid cooling system to be in an open state or a closed state in response to a control instruction of the external management component; The processing unit is further configured to determine a liquid leakage position of the external liquid cooling system according to the open state or the closed state.

18. A computer program product, characterised in that, The computer program comprises a program code which, when executed, causes the method of battery liquid leakage detection according to any one of claims 7 to 15 to be performed.

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