Cell liquid leakage detection circuit and method

Abstract

The invention provides a battery cell liquid leakage detection circuit and method.The circuit comprises a water leakage detection rope, the water leakage detection rope comprises a spiral frame and two conductive cores, and the two conductive cores are attached to the two sides of the spiral frame and are insulated and blocked by the spiral frame in the normal state; the water leakage detection rope is used for forming a low-resistance path between the two conductive cores when the water leakage detection rope is in contact with electrolyte of battery core leakage; and the controller is connected with the water leakage detection rope and is used for monitoring the change of the resistance between the conductive cores of the water leakage detection rope and triggering an alarm signal when the change of the resistance reaches a set threshold value. Safety risks caused by battery faults can be effectively prevented, and the reliability and safety of a battery system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery safety monitoring, and more specifically, to a battery cell leakage detection circuit and method. Background Art

[0002] Among the existing battery safety monitoring technologies, lithium battery leakage detection is a key link. As energy storage devices, lithium batteries are widely used in various electronic devices and electric vehicles. However, lithium battery leakage is a common failure mode, which may lead to battery performance degradation, battery pack short circuit, and even fire and other safety accidents. Traditional leakage detection methods often rely on simple physical or chemical sensing, which have limitations in sensitivity, response speed and accuracy. For example, some methods may not be able to monitor leakage in real time, or fail to issue an alarm in time when leakage occurs, resulting in the inability to take timely measures to prevent potential safety risks. In addition, some detection technologies may be costly and not conducive to large-scale deployment.

[0003] In the process of implementing the embodiments of the present invention, the inventors found that there are at least the following problems or defects in the prior art: there is a lack of a low-cost, highly sensitive battery cell leakage detection technology that can monitor in real time and accurately locate the leakage position. Summary of the invention

[0004] The invention provides a battery core leakage detection circuit and method.

[0005] In a first aspect of the present invention, a battery cell leakage detection circuit is provided, comprising:

[0006] A water leakage detection rope, comprising a spiral frame and two conductive cores, wherein the two conductive cores are attached to both sides of the spiral frame and are insulated and blocked by the spiral frame in a normal state, and the water leakage detection rope is used to form a low resistance path between the two conductive cores when contacting the electrolyte leaking from the battery core;

[0007] A controller is connected to the water leakage detection rope and is used to monitor the change of resistance between the conductive cores of the water leakage detection rope and trigger an alarm signal when the resistance change reaches a set threshold.

[0008] Furthermore, the spiral frame of the water leakage detection rope is made of insulating material.

[0009] Furthermore, the conductive core is made of metal material.

[0010] Furthermore, a BCU is included, and the controller is connected to the BCU via RS485 communication. When the controller detects that the battery cell is leaking, the controller transmits a signal to the BCU via RS485 communication.

[0011] Furthermore, the water leakage detection rope is placed at the bottom of each string of battery cells and as close to the battery cells as possible. When the battery cells leak, the electrolyte flows to the bottom of the battery cells due to gravity and contacts the water leakage detection rope.

[0012] Furthermore, the controller includes at least one of the following connection modes:

[0013] Connection method 1: The water leakage detection ropes in each PACK are connected in series, and the controller monitors the water leakage detection ropes in series. When leakage occurs, the signal is transmitted to the BCU through RS485 communication;

[0014] Connection method 2: Each PACK uses a separate controller, and each controller is connected in parallel via RS485 and configured as a slave of the BCU. When a leak occurs, it can be accurately detected in a certain PACK;

[0015] Connection mode three: the controller includes a liquid leakage detection board, and the water leakage detection rope is connected to the liquid leakage detection board.

[0016] Furthermore, the controller also includes a setting module for setting a resistance change threshold.

[0017] Furthermore, the controller also includes a storage module for storing detection data.

[0018] Furthermore, the controller also includes a display module for displaying the detection status.

[0019] In a second aspect of the present invention, a method for detecting a battery cell leakage is provided, comprising:

[0020] The water leakage detection rope is placed at the bottom of each string of battery cells and as close to the battery cells as possible, wherein the water leakage detection rope comprises a spiral frame and two conductive cores, wherein the two conductive cores are attached to both sides of the spiral frame and are insulated and blocked by the spiral frame in a normal state;

[0021] When the battery cell leaks, the electrolyte flows to the bottom of the battery cell due to gravity and contacts the leakage detection rope, so that a low resistance path is formed between the two conductive cores of the leakage detection rope;

[0022] The controller monitors the change of resistance between the conductive cores of the water leakage detection rope, and triggers an alarm signal when the resistance change reaches a set threshold.

[0023] The above-mentioned embodiments of the present invention have at least the following beneficial effects: the battery cell leakage detection circuit of the present invention can monitor the electrolyte leakage at the bottom of the battery cell in real time by using a water leakage detection rope and a controller. When leakage is detected, the controller can quickly trigger an alarm signal, so as to take timely measures to prevent the leakage from spreading further and protect the battery system from damage. This detection method can improve the safety and reliability of the battery system and reduce the potential safety hazards caused by leakage.

[0024] In addition, the design of the battery leakage detection circuit allows flexible connection methods and can be configured according to the needs of different application scenarios. For example, the controller can be connected to the BCU via RS485 communication to achieve remote monitoring and control. At the same time, the controller also has a setting module, a storage module, and a display module, which makes the recording, storage, and display of detection data more convenient, and can further improve the efficiency and accuracy of battery monitoring. This integrated design can reduce maintenance costs and improve the practicality and user-friendliness of the detection system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, in which:

[0026] Figure 1 A schematic diagram of the structure of a battery cell leakage detection circuit provided by one embodiment of the present invention;

[0027] Figure 2 A structural diagram of a connection method 1 provided by an embodiment of the present invention;

[0028] Figure 3 A structural schematic diagram of a second connection method provided by an embodiment of the present invention;

[0029] Figure 4 This is a structural diagram of connection mode 3 provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0030] The principles and spirit of the present invention will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are provided only to enable those skilled in the art to better understand and implement the present invention, and are not intended to limit the scope of the present invention in any way. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0031] Those skilled in the art know that the embodiments of the present invention can be implemented as a system, device, apparatus, method or computer program product. Therefore, the present invention can be specifically implemented in the following forms, namely: complete hardware, complete software (including firmware, resident software, microcode, etc.), or a combination of hardware and software.

[0032] It should be noted that any number of elements in the drawings is for illustration rather than limitation, and any naming is only for distinction and does not have any limiting meaning.

[0033] Reference below Figure 1 , Figure 1 This is a schematic diagram of the structure of a battery leakage detection circuit provided by an embodiment of the present invention. Figure 1 As shown, a battery cell leakage detection circuit includes:

[0034] A water leakage detection rope, comprising a spiral frame and two conductive cores, wherein the two conductive cores are attached to both sides of the spiral frame and are insulated and blocked by the spiral frame in a normal state, and the water leakage detection rope is used to form a low resistance path between the two conductive cores when contacting the electrolyte leaking from the battery core;

[0035] A controller is connected to the water leakage detection rope and is used to monitor the change of resistance between the conductive cores of the water leakage detection rope and trigger an alarm signal when the resistance change reaches a set threshold.

[0036] It should be noted that the core components of the battery cell leakage detection circuit include a water leakage detection rope and a controller. The water leakage detection rope consists of a spiral frame and two conductive cores, wherein the spiral frame plays a role in supporting and stabilizing the structure, while the conductive cores are attached to both sides of the spiral frame. Under normal conditions, the two conductive cores are insulated and blocked by the spiral frame to prevent false triggering. When the battery cell leaks, the electrolyte will contact the water leakage detection rope, forming a low resistance path between the two conductive cores. The controller is responsible for monitoring this resistance change and triggering an alarm signal when the set threshold is reached. The water leakage detection rope here is a sensing device specially designed for detecting liquid leaks, and the controller refers to an electronic device used to receive and process the detection rope signal.

[0037] Specifically, the spiral frame of the water leakage detection rope can be made of insulating materials such as polytetrafluoroethylene to ensure that no short circuit occurs between the conductive cores under normal conditions. The conductive core can be made of metal materials such as copper or aluminum to ensure good conductivity. The connection between the controller and the water leakage detection rope can be a direct physical connection or through wireless signal transmission. The set threshold of the resistance change can be adjusted according to the actual application scenario and safety requirements to meet different detection sensitivity requirements.

[0038] Preferably, the controller may further include a setting module for setting a resistance change threshold, so that the user can adjust the threshold according to the specific application environment and safety requirements to achieve more accurate leakage detection.

[0039] Furthermore, the controller may also include a storage module for storing detection data so as to record historical data of leakage events, and a display module for displaying the detection status so that the user can intuitively understand the current detection status. In some application scenarios, wireless communication technology may also be considered to replace RS485 communication to improve the flexibility of the system and the convenience of installation.

[0040] In some embodiments, the spiral frame of the water leakage detection rope is made of insulating material.

[0041] It should be noted that the spiral frame of the water leakage detection rope is made of insulating material. This is to ensure that under normal working conditions, there will be no accidental current flow between the conductive cores due to the conductivity of the frame, thereby ensuring the safety and reliability of the detection rope. Here, insulating materials refer to those materials that can prevent the passage of current. They can effectively isolate the conductive parts and prevent short circuits.

[0042] Specifically, the materials that can be used for the spiral frame include but are not limited to polytetrafluoroethylene (PTFE), polyethylene (PE), polyimide (PI), etc., all of which have good insulation properties and chemical stability. When selecting a specific insulating material, its chemical corrosion resistance, temperature resistance and mechanical strength need to be considered to adapt to different working environments. The design parameters of the spiral frame, such as diameter, pitch and material thickness, can be set according to the size of the battery cell and the required mechanical strength.

[0043] Preferably, the diameter of the spiral frame can be designed to match the size of the bottom of the battery cell to ensure a close fit and maximize the detection area. The pitch can be optimized according to the characteristics of the electrolyte flow to ensure that the electrolyte can quickly contact the conductive core when leakage occurs.

[0044] Furthermore, it is also possible to consider adding some textures or grooves to the spiral frame to increase the contact area with the electrolyte and improve the detection sensitivity. As an alternative, it is also possible to consider using fiber-reinforced composite materials to improve the mechanical strength and chemical resistance of the spiral frame while maintaining its insulation properties.

[0045] In some embodiments, the conductive core is made of metal material.

[0046] It should be noted that the conductive core is made of metal material to ensure that when the battery leaks, the conductive core can respond quickly and form a low resistance path, thereby triggering the alarm signal of the controller. Here, metal materials refer to materials with good conductive properties. They can quickly transmit current and are the key to realizing the leakage detection function.

[0047] Specifically, the materials that can be used for the conductive core include copper, aluminum, stainless steel, etc. These metals not only have excellent electrical conductivity, but also have good mechanical strength and corrosion resistance. When selecting a specific metal material, its conductivity, cost, weight, and compatibility with the electrolyte need to be considered. The size and shape of the conductive core also need to be designed according to the size and shape of the battery cell to ensure that they can be tightly attached to both sides of the spiral frame.

[0048] Preferably, the conductive core can be designed to be a flat strip or line to increase the contact area with the electrolyte and improve the detection sensitivity. The thickness and width of the conductive core can be set according to the size of the battery cell and the required mechanical strength.

[0049] Furthermore, in order to improve the corrosion resistance and extend the service life of the conductive core, an anti-oxidation coating such as nickel or tin can be applied to the surface of the conductive core. As an alternative, the conductive core of the plated or composite material can also be considered, which can provide an additional protective layer while maintaining good conductivity and enhancing the durability of the conductive core.

[0050] In some embodiments, a BCU is further included, and the controller is connected to the BCU via RS485 communication. When the controller detects that the battery cell is leaking, the controller transmits a signal to the BCU via RS485 communication.

[0051] It should be noted that the communication method between the controller and the battery control unit (BCU). Specifically, the controller is connected to the BCU through the RS485 communication protocol. When the controller detects a battery cell leakage, it can transmit the signal to the BCU through RS485 communication, thereby realizing remote monitoring and control. Here, RS485 communication is a commonly used serial communication standard, which allows multiple devices to transmit data through a pair of twisted pair cables, and is suitable for long-distance and multi-point communication.

[0052] Specifically, the RS485 communication protocol allows the data transmission rate, communication distance and number of connected devices between the controller and the BCU to be set according to actual application requirements. For example, the data transmission rate can be set according to the response speed requirements of the system, and common rates include 9600bps, 19200bps, 38400bps, etc.

[0053] More specifically, the communication distance can be determined by the quality of the cable and the anti-interference ability of the system, and can generally reach more than 1,200 meters. When connecting multiple devices, communication performance can be optimized by using terminal resistors and appropriate network topology.

[0054] Preferably, in order to improve the reliability and flexibility of the system, it is possible to consider adding some additional functions between the controller and the BCU, such as data encryption and error detection mechanisms, to ensure the security and integrity of the transmitted data. In addition, it is possible to consider using optical fiber instead of twisted pair as the transmission medium to further improve the anti-interference ability and transmission distance of the communication.

[0055] Furthermore, as an alternative, wireless communication technologies such as Wi-Fi or Bluetooth can also be considered to reduce the complexity and cost of wiring, especially in environments with limited space or difficult wiring. These wireless technologies can provide flexible installation options and can be easily integrated with existing wireless network infrastructure.

[0056] In some embodiments, the water leakage detection rope is placed at the bottom of each string of battery cells and as close to the battery cells as possible. When the battery cells leak, the electrolyte flows to the bottom of the battery cells due to gravity and contacts the water leakage detection rope.

[0057] It should be noted that the specific placement and method of the leakage detection rope. The leakage detection rope is placed at the bottom of each string of cells and as close to the cells as possible. This design is to ensure that when the cell leaks, the electrolyte flows to the bottom of the cell due to gravity and contacts the leakage detection rope, thereby triggering the detection mechanism. Here, each string of cells refers to a group of cells connected in series in the battery pack, which together provide the required voltage and capacity.

[0058] Specifically, the placement of the leak detection rope can be customized according to the arrangement and shape of the battery cells to ensure full coverage of the bottom of the battery cells. The length and width of the detection rope should match the size of the bottom of the battery cells to maximize the contact area and improve detection sensitivity.

[0059] More specifically, when installing, the detection rope should be laid flat or slightly bent to avoid folding or twisting, which may affect its detection performance. In addition, the distance between the detection rope and the battery cell should be kept within a certain range to ensure that the electrolyte can quickly contact the detection rope.

[0060] Preferably, the installation of the water leakage detection rope can be fixed by a fixing fixture or adhesive to ensure its stability at the bottom of the battery cell. In some applications, it is also possible to consider adding a layer of absorbent material, such as sponge or absorbent paper, under the detection rope to enhance the adsorption capacity of the electrolyte, thereby improving the response speed of the detection.

[0061] More specifically, the material and structure of the detection rope can be adjusted according to the specific design and working environment of the battery cell, such as using more wear-resistant or chemical-resistant materials, or adding special coatings to the surface of the detection rope to improve its durability and sensitivity.

[0062] Furthermore, as an alternative, other types of liquid detection sensors, such as capacitive or optical fiber sensors, may also be considered to adapt to different detection requirements and environmental conditions.

[0063] In some embodiments, the controller includes at least one of the following connection methods:

[0064] Connection method 1: The water leakage detection ropes in each PACK are connected in series, and the controller monitors the water leakage detection ropes in series. When leakage occurs, the signal is transmitted to the BCU through RS485 communication; Figure 2 shown.

[0065] Connection method 2: Each PACK uses a separate controller, and each controller is connected in parallel via RS485 and configured as a slave of the BCU. When a leak occurs, it can be accurately detected in a certain PACK; Figure 3 shown.

[0066] Connection method three: the controller includes a liquid leakage detection board, and the water leakage detection rope is connected to the liquid leakage detection board. Figure 4 shown.

[0067] It should be noted that there are three different connection methods that can be used between the controller and the water leakage detection rope. These connection methods allow the system to be flexibly configured according to actual needs to adapt to different application scenarios. Here, the connection method refers to the electrical connection method between the controller and the water leakage detection rope, which determines the signal transmission method and the scalability of the system.

[0068] Specifically, connection method one involves connecting the leak detection ropes in each PACK in series. The controller monitors these leak detection ropes in series and transmits the signal to the BCU via RS485 communication when a leak is detected. Connection method two uses a separate controller for each PACK. These controllers are connected in parallel via RS485 and configured as slaves of the BCU, so that the specific PACK where the leak occurs can be accurately located. Connection method three involves the use of a leak detection board. The leak detection rope is connected to this homemade circuit board to detect the leak. These connection methods can be specifically set according to the number of PACKs, spatial layout, and monitoring requirements.

[0069] Preferably, for connection mode 1, a main controller can be set to monitor all the leakage detection ropes in series, which can reduce the number of controllers required and reduce costs. For connection mode 2, each controller can have its own unique address so that the BCU can identify and communicate with it. In addition, it is also possible to consider integrating diagnostic functions into the controller to facilitate troubleshooting and maintenance. For connection mode 3, the leakage detection board can be designed to be modular for easy replacement and upgrading.

[0070] More specifically, multiple interfaces can be designed for the water leakage detection board to adapt to different types of water leakage detection ropes, thereby improving the compatibility and flexibility of the system. As an alternative, wireless communication technology can also be considered to replace RS485 communication, which can reduce wiring and improve the convenience of installation, especially in environments with limited space or difficult wiring.

[0071] In some embodiments, the controller further includes a setting module for setting a resistance change threshold.

[0072] It should be noted that the controller contains a setting module that allows the user to set the threshold of resistance change. This threshold is the key parameter for triggering the alarm signal. When the resistance change between the conductive cores of the water leakage detection rope exceeds this preset value, the controller will start the alarm program. Here, the setting module refers to a functional component in the controller that is used to adjust and configure the working parameters of the detection circuit.

[0073] Specifically, the setting module can be a physical knob, a digital input interface, or a parameter configured through a software interface. The user can use this module to set a specific resistance value. When the detected resistance change exceeds this value, the controller will assume that a leakage has occurred. This threshold can be set based on factors such as the type of battery cell, the properties of the electrolyte, and environmental conditions. For example, different thresholds may be required for different types of batteries to ensure the accuracy and sensitivity of the detection.

[0074] Preferably, the setting module can be designed with a user-friendly interface so that the operator can easily adjust the threshold. In addition, the module can provide a variety of preset threshold options to adapt to different types of cells under different working conditions.

[0075] More specifically, a lock function can be added to the setting module to prevent accidental changes to the threshold during normal operation. As an alternative, consider using an automatic learning algorithm to dynamically adjust the threshold, which can automatically optimize the threshold setting based on historical data and environmental changes, thereby improving the accuracy and adaptability of detection.

[0076] In some embodiments, the controller further comprises a storage module for storing detection data.

[0077] It should be noted that the storage module contained in the controller is used to store the detected data. This storage module is a functional component in the controller, which can record and save key information in the battery leakage detection process for subsequent analysis and maintenance. Here, the storage module refers to the hardware or software part of the controller for data storage, which can be a built-in memory or a connected external storage device.

[0078] Specifically, the storage module can be a flash memory chip, a hard disk drive or a solid state drive, etc., which can store data for a long time without losing it. This module can be set with different parameters, such as storage capacity, data retention period and data format. For example, the storage module can be configured to save the detection data of the last few months as needed, or set to cyclically overwrite old data to save space. The data format can be text, chart or binary code to facilitate reading and analysis for different purposes.

[0079] Preferably, the storage module can be designed to have high reliability and large capacity to ensure the integrity and availability of data during long-term operation. In addition, a data encryption function can be set for the storage module to protect the stored data from unauthorized access.

[0080] More specifically, a data backup function may be added to the storage module to regularly back up data to a remote server or cloud storage to prevent data loss due to failure of a local storage device.

[0081] Furthermore, as an alternative, wireless transmission technology can also be considered to send data to a central monitoring system in real time, which can reduce the reliance on local storage modules while improving the real-time nature and accessibility of the data.

[0082] In some embodiments, the controller further comprises a display module for displaying the detection status.

[0083] It should be noted that the display module contained in the controller is used to display the detection status to the user. The display module is a functional component in the controller, which can display the current status and history of battery leakage detection in real time, providing an intuitive operation interface for users. Here, the display module refers to the hardware or software part of the controller used for information display, which can be an LCD display, LED display, or displayed on a computer through a software interface.

[0084] Specifically, the display module can be a touch screen or non-touch screen LCD screen, which can display the detection data in the form of graphics or text. This module can set different parameters, such as display brightness, contrast, font size and color. For example, the display module can be configured to display real-time resistance value, alarm history and system status information as needed. In addition, the display module can also provide user interaction functions, such as touch operation or key operation, so that users can set parameters and view detailed information.

[0085] Preferably, the display module can be designed to have high resolution and high contrast to ensure that information can be clearly displayed under different light conditions. In addition, the display module can be provided with a function of automatically adjusting brightness to adapt to different working environments.

[0086] More specifically, a multi-language support function can be added to the display module to meet the needs of users in different regions. As an alternative, wireless transmission technology can also be considered to push the display information to the user's smartphone or tablet, which can improve the portability and flexibility of the system. In addition, the voice broadcast function can also be considered to provide voice prompts of the detection status for users with visual impairments.

[0087] The above-mentioned embodiments of the present invention have the following beneficial effects: the battery cell leakage detection circuit of the present invention can realize high-sensitivity detection of battery cell leakage through its innovative design of leakage detection rope and controller. The leakage detection rope is composed of a spiral frame and two conductive cores, which can form a low-resistance path when in contact with the electrolyte, and the controller monitors the resistance change and triggers an alarm signal when the threshold is reached, so as to promptly remind the user of the leakage of the battery cell and avoid safety problems caused by battery failure.

[0088] Furthermore, the insulating spiral frame of the leakage detection rope, the metal conductive core, the RS485 communication connection with the BCU, the placement of the leakage detection rope, the various controller connection methods, and the resistance change threshold setting module, storage module and display module set in the controller can jointly improve the performance and practicality of the detection circuit. These designs can not only ensure the accuracy and response speed of the detection, but also realize the effective recording and display of the detection data, so that maintenance personnel can quickly locate the problem and take corresponding measures, which can enhance the safety and stability of the entire battery system.

[0089] A method for detecting battery cell leakage in some embodiments includes:

[0090] The water leakage detection rope is placed at the bottom of each string of battery cells and as close to the battery cells as possible, wherein the water leakage detection rope comprises a spiral frame and two conductive cores, wherein the two conductive cores are attached to both sides of the spiral frame and are insulated and blocked by the spiral frame in a normal state;

[0091] When the battery cell leaks, the electrolyte flows to the bottom of the battery cell due to gravity and contacts the leakage detection rope, so that a low resistance path is formed between the two conductive cores of the leakage detection rope;

[0092] The controller monitors the change of resistance between the conductive cores of the water leakage detection rope, and triggers an alarm signal when the resistance change reaches a set threshold.

[0093] It is understandable that the steps described in the battery leakage detection method are similar to those described in the reference Figure 1 Therefore, the modules, features and beneficial effects described above for the battery leakage detection circuit are also applicable to the battery leakage detection method and the operations contained therein, and will not be described in detail here.

Claims

1. A battery cell leakage detection circuit, characterized in that: include: A water leakage detection rope, comprising a spiral frame and two conductive cores, wherein the two conductive cores are attached to both sides of the spiral frame and are insulated and blocked by the spiral frame in a normal state, and the water leakage detection rope is used to form a low resistance path between the two conductive cores when contacting the electrolyte leaking from the battery core; A controller is connected to the water leakage detection rope and is used to monitor the change of resistance between the conductive cores of the water leakage detection rope and trigger an alarm signal when the resistance change reaches a set threshold.

2. A battery cell leakage detection circuit according to claim 1, characterized in that: The spiral frame of the water leakage detection rope is made of insulating material.

3. A battery cell leakage detection circuit according to claim 1, characterized in that: The conductive core is made of metal material.

4. A battery cell leakage detection circuit according to claim 1, characterized in that: It also includes a BCU, and the controller is connected to the BCU via RS485 communication. When the controller detects that the battery cell is leaking, the controller transmits a signal to the BCU via RS485 communication.

5. A battery cell leakage detection circuit according to claim 1, characterized in that: The water leakage detection rope is placed at the bottom of each string of battery cells and as close to the battery cells as possible. When the battery cells leak, the electrolyte flows to the bottom of the battery cells due to gravity and contacts the water leakage detection rope.

6. A battery cell leakage detection circuit according to claim 1, characterized in that: The controller includes at least one of the following connection modes: Connection method 1: The water leakage detection ropes in each PACK are connected in series, and the controller monitors the water leakage detection ropes in series. When leakage occurs, the signal is transmitted to the BCU through RS485 communication; Connection method 2: Each PACK uses a separate controller, and each controller is connected in parallel via RS485 and configured as a slave of the BCU. When a leak occurs, it can be accurately detected in a certain PACK; Connection mode three: the controller includes a liquid leakage detection board, and the water leakage detection rope is connected to the liquid leakage detection board.

7. A battery cell leakage detection circuit according to claim 1, characterized in that: The controller also includes a setting module for setting a resistance change threshold.

8. A battery cell leakage detection circuit according to claim 1, characterized in that: The controller further comprises a storage module for storing detection data.

9. A battery cell leakage detection circuit according to claim 1, characterized in that: The controller also includes a display module for displaying the detection status.

10. A method for detecting battery leakage, characterized in that: The following steps are involved: The water leakage detection rope is placed at the bottom of each string of battery cells and as close to the battery cells as possible, wherein the water leakage detection rope comprises a spiral frame and two conductive cores, wherein the two conductive cores are attached to both sides of the spiral frame and are insulated and blocked by the spiral frame in a normal state; When the battery cell leaks, the electrolyte flows to the bottom of the battery cell due to gravity and contacts the leakage detection rope, so that a low resistance path is formed between the two conductive cores of the leakage detection rope; The controller monitors the change of resistance between the conductive cores of the water leakage detection rope, and triggers an alarm signal when the resistance change reaches a set threshold.

Images